drivers/scsi/scsi_transport_iscsi.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * iSCSI transport class definitions
   4  *
   5  * Copyright (C) IBM Corporation, 2004
   6  * Copyright (C) Mike Christie, 2004 - 2005
   7  * Copyright (C) Dmitry Yusupov, 2004 - 2005
   8  * Copyright (C) Alex Aizman, 2004 - 2005
   9  */
  10 #include <linux/module.h>
  11 #include <linux/mutex.h>
  12 #include <linux/slab.h>
  13 #include <linux/bsg-lib.h>
  14 #include <linux/idr.h>
  15 #include <net/tcp.h>
  16 #include <scsi/scsi.h>
  17 #include <scsi/scsi_host.h>
  18 #include <scsi/scsi_device.h>
  19 #include <scsi/scsi_transport.h>
  20 #include <scsi/scsi_transport_iscsi.h>
  21 #include <scsi/iscsi_if.h>
  22 #include <scsi/scsi_cmnd.h>
  23 #include <scsi/scsi_bsg_iscsi.h>
  24
  25 #define ISCSI_TRANSPORT_VERSION "2.0-870"
  26
  27 #define ISCSI_SEND_MAX_ALLOWED  10
  28
  29 #define CREATE_TRACE_POINTS
  30 #include <trace/events/iscsi.h>
  31
  32 /*
  33  * Export tracepoint symbols to be used by other modules.
  34  */
  35 EXPORT_TRACEPOINT_SYMBOL_GPL(iscsi_dbg_conn);
  36 EXPORT_TRACEPOINT_SYMBOL_GPL(iscsi_dbg_eh);
  37 EXPORT_TRACEPOINT_SYMBOL_GPL(iscsi_dbg_session);
  38 EXPORT_TRACEPOINT_SYMBOL_GPL(iscsi_dbg_tcp);
  39 EXPORT_TRACEPOINT_SYMBOL_GPL(iscsi_dbg_sw_tcp);
  40
  41 static int dbg_session;
  42 module_param_named(debug_session, dbg_session, int,
  43                    S_IRUGO | S_IWUSR);
  44 MODULE_PARM_DESC(debug_session,
  45                  "Turn on debugging for sessions in scsi_transport_iscsi "
  46                  "module. Set to 1 to turn on, and zero to turn off. Default "
  47                  "is off.");
  48
  49 static int dbg_conn;
  50 module_param_named(debug_conn, dbg_conn, int,
  51                    S_IRUGO | S_IWUSR);
  52 MODULE_PARM_DESC(debug_conn,
  53                  "Turn on debugging for connections in scsi_transport_iscsi "
  54                  "module. Set to 1 to turn on, and zero to turn off. Default "
  55                  "is off.");
  56
  57 #define ISCSI_DBG_TRANS_SESSION(_session, dbg_fmt, arg...)              \
  58         do {                                                            \
  59                 if (dbg_session)                                        \
  60                         iscsi_cls_session_printk(KERN_INFO, _session,   \
  61                                                  "%s: " dbg_fmt,        \
  62                                                  __func__, ##arg);      \
  63                 iscsi_dbg_trace(trace_iscsi_dbg_trans_session,          \
  64                                 &(_session)->dev,                       \
  65                                 "%s " dbg_fmt, __func__, ##arg);        \
  66         } while (0);
  67
  68 #define ISCSI_DBG_TRANS_CONN(_conn, dbg_fmt, arg...)                    \
  69         do {                                                            \
  70                 if (dbg_conn)                                           \
  71                         iscsi_cls_conn_printk(KERN_INFO, _conn,         \
  72                                               "%s: " dbg_fmt,           \
  73                                               __func__, ##arg);         \
  74                 iscsi_dbg_trace(trace_iscsi_dbg_trans_conn,             \
  75                                 &(_conn)->dev,                          \
  76                                 "%s " dbg_fmt, __func__, ##arg);        \
  77         } while (0);
  78
  79 struct iscsi_internal {
  80         struct scsi_transport_template t;
  81         struct iscsi_transport *iscsi_transport;
  82         struct list_head list;
  83         struct device dev;
  84
  85         struct transport_container conn_cont;
  86         struct transport_container session_cont;
  87 };
  88
  89 static atomic_t iscsi_session_nr; /* sysfs session id for next new session */
  90 static struct workqueue_struct *iscsi_eh_timer_workq;
  91
  92 static DEFINE_IDA(iscsi_sess_ida);
  93 /*
  94  * list of registered transports and lock that must
  95  * be held while accessing list. The iscsi_transport_lock must
  96  * be acquired after the rx_queue_mutex.
  97  */
  98 static LIST_HEAD(iscsi_transports);
  99 static DEFINE_SPINLOCK(iscsi_transport_lock);
 100
 101 #define to_iscsi_internal(tmpl) \
 102         container_of(tmpl, struct iscsi_internal, t)
 103
 104 #define dev_to_iscsi_internal(_dev) \
 105         container_of(_dev, struct iscsi_internal, dev)
 106
 107 static void iscsi_transport_release(struct device *dev)
 108 {
 109         struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
 110         kfree(priv);
 111 }
 112
 113 /*
 114  * iscsi_transport_class represents the iscsi_transports that are
 115  * registered.
 116  */
 117 static struct class iscsi_transport_class = {
 118         .name = "iscsi_transport",
 119         .dev_release = iscsi_transport_release,
 120 };
 121
 122 static ssize_t
 123 show_transport_handle(struct device *dev, struct device_attribute *attr,
 124                       char *buf)
 125 {
 126         struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
 127         return sprintf(buf, "%llu\n", (unsigned long long)iscsi_handle(priv->iscsi_transport));
 128 }
 129 static DEVICE_ATTR(handle, S_IRUGO, show_transport_handle, NULL);
 130
 131 #define show_transport_attr(name, format)                               \
 132 static ssize_t                                                          \
 133 show_transport_##name(struct device *dev,                               \
 134                       struct device_attribute *attr,char *buf)          \
 135 {                                                                       \
 136         struct iscsi_internal *priv = dev_to_iscsi_internal(dev);       \
 137         return sprintf(buf, format"\n", priv->iscsi_transport->name);   \
 138 }                                                                       \
 139 static DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL);
 140
 141 show_transport_attr(caps, "0x%x");
 142
 143 static struct attribute *iscsi_transport_attrs[] = {
 144         &dev_attr_handle.attr,
 145         &dev_attr_caps.attr,
 146         NULL,
 147 };
 148
 149 static struct attribute_group iscsi_transport_group = {
 150         .attrs = iscsi_transport_attrs,
 151 };
 152
 153 /*
 154  * iSCSI endpoint attrs
 155  */
 156 #define iscsi_dev_to_endpoint(_dev) \
 157         container_of(_dev, struct iscsi_endpoint, dev)
 158
 159 #define ISCSI_ATTR(_prefix,_name,_mode,_show,_store)    \
 160 struct device_attribute dev_attr_##_prefix##_##_name =  \
 161         __ATTR(_name,_mode,_show,_store)
 162
 163 static void iscsi_endpoint_release(struct device *dev)
 164 {
 165         struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
 166         kfree(ep);
 167 }
 168
 169 static struct class iscsi_endpoint_class = {
 170         .name = "iscsi_endpoint",
 171         .dev_release = iscsi_endpoint_release,
 172 };
 173
 174 static ssize_t
 175 show_ep_handle(struct device *dev, struct device_attribute *attr, char *buf)
 176 {
 177         struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
 178         return sprintf(buf, "%llu\n", (unsigned long long) ep->id);
 179 }
 180 static ISCSI_ATTR(ep, handle, S_IRUGO, show_ep_handle, NULL);
 181
 182 static struct attribute *iscsi_endpoint_attrs[] = {
 183         &dev_attr_ep_handle.attr,
 184         NULL,
 185 };
 186
 187 static struct attribute_group iscsi_endpoint_group = {
 188         .attrs = iscsi_endpoint_attrs,
 189 };
 190
 191 #define ISCSI_MAX_EPID -1
 192
 193 static int iscsi_match_epid(struct device *dev, const void *data)
 194 {
 195         struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
 196         const uint64_t *epid = data;
 197
 198         return *epid == ep->id;
 199 }
 200
 201 struct iscsi_endpoint *
 202 iscsi_create_endpoint(int dd_size)
 203 {
 204         struct device *dev;
 205         struct iscsi_endpoint *ep;
 206         uint64_t id;
 207         int err;
 208
 209         for (id = 1; id < ISCSI_MAX_EPID; id++) {
 210                 dev = class_find_device(&iscsi_endpoint_class, NULL, &id,
 211                                         iscsi_match_epid);
 212                 if (!dev)
 213                         break;
 214                 else
 215                         put_device(dev);
 216         }
 217         if (id == ISCSI_MAX_EPID) {
 218                 printk(KERN_ERR "Too many connections. Max supported %u\n",
 219                        ISCSI_MAX_EPID - 1);
 220                 return NULL;
 221         }
 222
 223         ep = kzalloc(sizeof(*ep) + dd_size, GFP_KERNEL);
 224         if (!ep)
 225                 return NULL;
 226
 227         ep->id = id;
 228         ep->dev.class = &iscsi_endpoint_class;
 229         dev_set_name(&ep->dev, "ep-%llu", (unsigned long long) id);
 230         err = device_register(&ep->dev);
 231         if (err)
 232                 goto free_ep;
 233
 234         err = sysfs_create_group(&ep->dev.kobj, &iscsi_endpoint_group);
 235         if (err)
 236                 goto unregister_dev;
 237
 238         if (dd_size)
 239                 ep->dd_data = &ep[1];
 240         return ep;
 241
 242 unregister_dev:
 243         device_unregister(&ep->dev);
 244         return NULL;
 245
 246 free_ep:
 247         kfree(ep);
 248         return NULL;
 249 }
 250 EXPORT_SYMBOL_GPL(iscsi_create_endpoint);
 251
 252 void iscsi_destroy_endpoint(struct iscsi_endpoint *ep)
 253 {
 254         sysfs_remove_group(&ep->dev.kobj, &iscsi_endpoint_group);
 255         device_unregister(&ep->dev);
 256 }
 257 EXPORT_SYMBOL_GPL(iscsi_destroy_endpoint);
 258
 259 struct iscsi_endpoint *iscsi_lookup_endpoint(u64 handle)
 260 {
 261         struct iscsi_endpoint *ep;
 262         struct device *dev;
 263
 264         dev = class_find_device(&iscsi_endpoint_class, NULL, &handle,
 265                                 iscsi_match_epid);
 266         if (!dev)
 267                 return NULL;
 268
 269         ep = iscsi_dev_to_endpoint(dev);
 270         /*
 271          * we can drop this now because the interface will prevent
 272          * removals and lookups from racing.
 273          */
 274         put_device(dev);
 275         return ep;
 276 }
 277 EXPORT_SYMBOL_GPL(iscsi_lookup_endpoint);
 278
 279 /*
 280  * Interface to display network param to sysfs
 281  */
 282
 283 static void iscsi_iface_release(struct device *dev)
 284 {
 285         struct iscsi_iface *iface = iscsi_dev_to_iface(dev);
 286         struct device *parent = iface->dev.parent;
 287
 288         kfree(iface);
 289         put_device(parent);
 290 }
 291
 292
 293 static struct class iscsi_iface_class = {
 294         .name = "iscsi_iface",
 295         .dev_release = iscsi_iface_release,
 296 };
 297
 298 #define ISCSI_IFACE_ATTR(_prefix, _name, _mode, _show, _store)  \
 299 struct device_attribute dev_attr_##_prefix##_##_name =          \
 300         __ATTR(_name, _mode, _show, _store)
 301
 302 /* iface attrs show */
 303 #define iscsi_iface_attr_show(type, name, param_type, param)            \
 304 static ssize_t                                                          \
 305 show_##type##_##name(struct device *dev, struct device_attribute *attr, \
 306                      char *buf)                                         \
 307 {                                                                       \
 308         struct iscsi_iface *iface = iscsi_dev_to_iface(dev);            \
 309         struct iscsi_transport *t = iface->transport;                   \
 310         return t->get_iface_param(iface, param_type, param, buf);       \
 311 }                                                                       \
 312
 313 #define iscsi_iface_net_attr(type, name, param)                         \
 314         iscsi_iface_attr_show(type, name, ISCSI_NET_PARAM, param)       \
 315 static ISCSI_IFACE_ATTR(type, name, S_IRUGO, show_##type##_##name, NULL);
 316
 317 #define iscsi_iface_attr(type, name, param)                             \
 318         iscsi_iface_attr_show(type, name, ISCSI_IFACE_PARAM, param)     \
 319 static ISCSI_IFACE_ATTR(type, name, S_IRUGO, show_##type##_##name, NULL);
 320
 321 /* generic read only ipv4 attribute */
 322 iscsi_iface_net_attr(ipv4_iface, ipaddress, ISCSI_NET_PARAM_IPV4_ADDR);
 323 iscsi_iface_net_attr(ipv4_iface, gateway, ISCSI_NET_PARAM_IPV4_GW);
 324 iscsi_iface_net_attr(ipv4_iface, subnet, ISCSI_NET_PARAM_IPV4_SUBNET);
 325 iscsi_iface_net_attr(ipv4_iface, bootproto, ISCSI_NET_PARAM_IPV4_BOOTPROTO);
 326 iscsi_iface_net_attr(ipv4_iface, dhcp_dns_address_en,
 327                      ISCSI_NET_PARAM_IPV4_DHCP_DNS_ADDR_EN);
 328 iscsi_iface_net_attr(ipv4_iface, dhcp_slp_da_info_en,
 329                      ISCSI_NET_PARAM_IPV4_DHCP_SLP_DA_EN);
 330 iscsi_iface_net_attr(ipv4_iface, tos_en, ISCSI_NET_PARAM_IPV4_TOS_EN);
 331 iscsi_iface_net_attr(ipv4_iface, tos, ISCSI_NET_PARAM_IPV4_TOS);
 332 iscsi_iface_net_attr(ipv4_iface, grat_arp_en,
 333                      ISCSI_NET_PARAM_IPV4_GRAT_ARP_EN);
 334 iscsi_iface_net_attr(ipv4_iface, dhcp_alt_client_id_en,
 335                      ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID_EN);
 336 iscsi_iface_net_attr(ipv4_iface, dhcp_alt_client_id,
 337                      ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID);
 338 iscsi_iface_net_attr(ipv4_iface, dhcp_req_vendor_id_en,
 339                      ISCSI_NET_PARAM_IPV4_DHCP_REQ_VENDOR_ID_EN);
 340 iscsi_iface_net_attr(ipv4_iface, dhcp_use_vendor_id_en,
 341                      ISCSI_NET_PARAM_IPV4_DHCP_USE_VENDOR_ID_EN);
 342 iscsi_iface_net_attr(ipv4_iface, dhcp_vendor_id,
 343                      ISCSI_NET_PARAM_IPV4_DHCP_VENDOR_ID);
 344 iscsi_iface_net_attr(ipv4_iface, dhcp_learn_iqn_en,
 345                      ISCSI_NET_PARAM_IPV4_DHCP_LEARN_IQN_EN);
 346 iscsi_iface_net_attr(ipv4_iface, fragment_disable,
 347                      ISCSI_NET_PARAM_IPV4_FRAGMENT_DISABLE);
 348 iscsi_iface_net_attr(ipv4_iface, incoming_forwarding_en,
 349                      ISCSI_NET_PARAM_IPV4_IN_FORWARD_EN);
 350 iscsi_iface_net_attr(ipv4_iface, ttl, ISCSI_NET_PARAM_IPV4_TTL);
 351
 352 /* generic read only ipv6 attribute */
 353 iscsi_iface_net_attr(ipv6_iface, ipaddress, ISCSI_NET_PARAM_IPV6_ADDR);
 354 iscsi_iface_net_attr(ipv6_iface, link_local_addr,
 355                      ISCSI_NET_PARAM_IPV6_LINKLOCAL);
 356 iscsi_iface_net_attr(ipv6_iface, router_addr, ISCSI_NET_PARAM_IPV6_ROUTER);
 357 iscsi_iface_net_attr(ipv6_iface, ipaddr_autocfg,
 358                      ISCSI_NET_PARAM_IPV6_ADDR_AUTOCFG);
 359 iscsi_iface_net_attr(ipv6_iface, link_local_autocfg,
 360                      ISCSI_NET_PARAM_IPV6_LINKLOCAL_AUTOCFG);
 361 iscsi_iface_net_attr(ipv6_iface, link_local_state,
 362                      ISCSI_NET_PARAM_IPV6_LINKLOCAL_STATE);
 363 iscsi_iface_net_attr(ipv6_iface, router_state,
 364                      ISCSI_NET_PARAM_IPV6_ROUTER_STATE);
 365 iscsi_iface_net_attr(ipv6_iface, grat_neighbor_adv_en,
 366                      ISCSI_NET_PARAM_IPV6_GRAT_NEIGHBOR_ADV_EN);
 367 iscsi_iface_net_attr(ipv6_iface, mld_en, ISCSI_NET_PARAM_IPV6_MLD_EN);
 368 iscsi_iface_net_attr(ipv6_iface, flow_label, ISCSI_NET_PARAM_IPV6_FLOW_LABEL);
 369 iscsi_iface_net_attr(ipv6_iface, traffic_class,
 370                      ISCSI_NET_PARAM_IPV6_TRAFFIC_CLASS);
 371 iscsi_iface_net_attr(ipv6_iface, hop_limit, ISCSI_NET_PARAM_IPV6_HOP_LIMIT);
 372 iscsi_iface_net_attr(ipv6_iface, nd_reachable_tmo,
 373                      ISCSI_NET_PARAM_IPV6_ND_REACHABLE_TMO);
 374 iscsi_iface_net_attr(ipv6_iface, nd_rexmit_time,
 375                      ISCSI_NET_PARAM_IPV6_ND_REXMIT_TIME);
 376 iscsi_iface_net_attr(ipv6_iface, nd_stale_tmo,
 377                      ISCSI_NET_PARAM_IPV6_ND_STALE_TMO);
 378 iscsi_iface_net_attr(ipv6_iface, dup_addr_detect_cnt,
 379                      ISCSI_NET_PARAM_IPV6_DUP_ADDR_DETECT_CNT);
 380 iscsi_iface_net_attr(ipv6_iface, router_adv_link_mtu,
 381                      ISCSI_NET_PARAM_IPV6_RTR_ADV_LINK_MTU);
 382
 383 /* common read only iface attribute */
 384 iscsi_iface_net_attr(iface, enabled, ISCSI_NET_PARAM_IFACE_ENABLE);
 385 iscsi_iface_net_attr(iface, vlan_id, ISCSI_NET_PARAM_VLAN_ID);
 386 iscsi_iface_net_attr(iface, vlan_priority, ISCSI_NET_PARAM_VLAN_PRIORITY);
 387 iscsi_iface_net_attr(iface, vlan_enabled, ISCSI_NET_PARAM_VLAN_ENABLED);
 388 iscsi_iface_net_attr(iface, mtu, ISCSI_NET_PARAM_MTU);
 389 iscsi_iface_net_attr(iface, port, ISCSI_NET_PARAM_PORT);
 390 iscsi_iface_net_attr(iface, ipaddress_state, ISCSI_NET_PARAM_IPADDR_STATE);
 391 iscsi_iface_net_attr(iface, delayed_ack_en, ISCSI_NET_PARAM_DELAYED_ACK_EN);
 392 iscsi_iface_net_attr(iface, tcp_nagle_disable,
 393                      ISCSI_NET_PARAM_TCP_NAGLE_DISABLE);
 394 iscsi_iface_net_attr(iface, tcp_wsf_disable, ISCSI_NET_PARAM_TCP_WSF_DISABLE);
 395 iscsi_iface_net_attr(iface, tcp_wsf, ISCSI_NET_PARAM_TCP_WSF);
 396 iscsi_iface_net_attr(iface, tcp_timer_scale, ISCSI_NET_PARAM_TCP_TIMER_SCALE);
 397 iscsi_iface_net_attr(iface, tcp_timestamp_en, ISCSI_NET_PARAM_TCP_TIMESTAMP_EN);
 398 iscsi_iface_net_attr(iface, cache_id, ISCSI_NET_PARAM_CACHE_ID);
 399 iscsi_iface_net_attr(iface, redirect_en, ISCSI_NET_PARAM_REDIRECT_EN);
 400
 401 /* common iscsi specific settings attributes */
 402 iscsi_iface_attr(iface, def_taskmgmt_tmo, ISCSI_IFACE_PARAM_DEF_TASKMGMT_TMO);
 403 iscsi_iface_attr(iface, header_digest, ISCSI_IFACE_PARAM_HDRDGST_EN);
 404 iscsi_iface_attr(iface, data_digest, ISCSI_IFACE_PARAM_DATADGST_EN);
 405 iscsi_iface_attr(iface, immediate_data, ISCSI_IFACE_PARAM_IMM_DATA_EN);
 406 iscsi_iface_attr(iface, initial_r2t, ISCSI_IFACE_PARAM_INITIAL_R2T_EN);
 407 iscsi_iface_attr(iface, data_seq_in_order,
 408                  ISCSI_IFACE_PARAM_DATASEQ_INORDER_EN);
 409 iscsi_iface_attr(iface, data_pdu_in_order, ISCSI_IFACE_PARAM_PDU_INORDER_EN);
 410 iscsi_iface_attr(iface, erl, ISCSI_IFACE_PARAM_ERL);
 411 iscsi_iface_attr(iface, max_recv_dlength, ISCSI_IFACE_PARAM_MAX_RECV_DLENGTH);
 412 iscsi_iface_attr(iface, first_burst_len, ISCSI_IFACE_PARAM_FIRST_BURST);
 413 iscsi_iface_attr(iface, max_outstanding_r2t, ISCSI_IFACE_PARAM_MAX_R2T);
 414 iscsi_iface_attr(iface, max_burst_len, ISCSI_IFACE_PARAM_MAX_BURST);
 415 iscsi_iface_attr(iface, chap_auth, ISCSI_IFACE_PARAM_CHAP_AUTH_EN);
 416 iscsi_iface_attr(iface, bidi_chap, ISCSI_IFACE_PARAM_BIDI_CHAP_EN);
 417 iscsi_iface_attr(iface, discovery_auth_optional,
 418                  ISCSI_IFACE_PARAM_DISCOVERY_AUTH_OPTIONAL);
 419 iscsi_iface_attr(iface, discovery_logout,
 420                  ISCSI_IFACE_PARAM_DISCOVERY_LOGOUT_EN);
 421 iscsi_iface_attr(iface, strict_login_comp_en,
 422                  ISCSI_IFACE_PARAM_STRICT_LOGIN_COMP_EN);
 423 iscsi_iface_attr(iface, initiator_name, ISCSI_IFACE_PARAM_INITIATOR_NAME);
 424
 425 static umode_t iscsi_iface_attr_is_visible(struct kobject *kobj,
 426                                           struct attribute *attr, int i)
 427 {
 428         struct device *dev = container_of(kobj, struct device, kobj);
 429         struct iscsi_iface *iface = iscsi_dev_to_iface(dev);
 430         struct iscsi_transport *t = iface->transport;
 431         int param;
 432         int param_type;
 433
 434         if (attr == &dev_attr_iface_enabled.attr)
 435                 param = ISCSI_NET_PARAM_IFACE_ENABLE;
 436         else if (attr == &dev_attr_iface_vlan_id.attr)
 437                 param = ISCSI_NET_PARAM_VLAN_ID;
 438         else if (attr == &dev_attr_iface_vlan_priority.attr)
 439                 param = ISCSI_NET_PARAM_VLAN_PRIORITY;
 440         else if (attr == &dev_attr_iface_vlan_enabled.attr)
 441                 param = ISCSI_NET_PARAM_VLAN_ENABLED;
 442         else if (attr == &dev_attr_iface_mtu.attr)
 443                 param = ISCSI_NET_PARAM_MTU;
 444         else if (attr == &dev_attr_iface_port.attr)
 445                 param = ISCSI_NET_PARAM_PORT;
 446         else if (attr == &dev_attr_iface_ipaddress_state.attr)
 447                 param = ISCSI_NET_PARAM_IPADDR_STATE;
 448         else if (attr == &dev_attr_iface_delayed_ack_en.attr)
 449                 param = ISCSI_NET_PARAM_DELAYED_ACK_EN;
 450         else if (attr == &dev_attr_iface_tcp_nagle_disable.attr)
 451                 param = ISCSI_NET_PARAM_TCP_NAGLE_DISABLE;
 452         else if (attr == &dev_attr_iface_tcp_wsf_disable.attr)
 453                 param = ISCSI_NET_PARAM_TCP_WSF_DISABLE;
 454         else if (attr == &dev_attr_iface_tcp_wsf.attr)
 455                 param = ISCSI_NET_PARAM_TCP_WSF;
 456         else if (attr == &dev_attr_iface_tcp_timer_scale.attr)
 457                 param = ISCSI_NET_PARAM_TCP_TIMER_SCALE;
 458         else if (attr == &dev_attr_iface_tcp_timestamp_en.attr)
 459                 param = ISCSI_NET_PARAM_TCP_TIMESTAMP_EN;
 460         else if (attr == &dev_attr_iface_cache_id.attr)
 461                 param = ISCSI_NET_PARAM_CACHE_ID;
 462         else if (attr == &dev_attr_iface_redirect_en.attr)
 463                 param = ISCSI_NET_PARAM_REDIRECT_EN;
 464         else if (attr == &dev_attr_iface_def_taskmgmt_tmo.attr)
 465                 param = ISCSI_IFACE_PARAM_DEF_TASKMGMT_TMO;
 466         else if (attr == &dev_attr_iface_header_digest.attr)
 467                 param = ISCSI_IFACE_PARAM_HDRDGST_EN;
 468         else if (attr == &dev_attr_iface_data_digest.attr)
 469                 param = ISCSI_IFACE_PARAM_DATADGST_EN;
 470         else if (attr == &dev_attr_iface_immediate_data.attr)
 471                 param = ISCSI_IFACE_PARAM_IMM_DATA_EN;
 472         else if (attr == &dev_attr_iface_initial_r2t.attr)
 473                 param = ISCSI_IFACE_PARAM_INITIAL_R2T_EN;
 474         else if (attr == &dev_attr_iface_data_seq_in_order.attr)
 475                 param = ISCSI_IFACE_PARAM_DATASEQ_INORDER_EN;
 476         else if (attr == &dev_attr_iface_data_pdu_in_order.attr)
 477                 param = ISCSI_IFACE_PARAM_PDU_INORDER_EN;
 478         else if (attr == &dev_attr_iface_erl.attr)
 479                 param = ISCSI_IFACE_PARAM_ERL;
 480         else if (attr == &dev_attr_iface_max_recv_dlength.attr)
 481                 param = ISCSI_IFACE_PARAM_MAX_RECV_DLENGTH;
 482         else if (attr == &dev_attr_iface_first_burst_len.attr)
 483                 param = ISCSI_IFACE_PARAM_FIRST_BURST;
 484         else if (attr == &dev_attr_iface_max_outstanding_r2t.attr)
 485                 param = ISCSI_IFACE_PARAM_MAX_R2T;
 486         else if (attr == &dev_attr_iface_max_burst_len.attr)
 487                 param = ISCSI_IFACE_PARAM_MAX_BURST;
 488         else if (attr == &dev_attr_iface_chap_auth.attr)
 489                 param = ISCSI_IFACE_PARAM_CHAP_AUTH_EN;
 490         else if (attr == &dev_attr_iface_bidi_chap.attr)
 491                 param = ISCSI_IFACE_PARAM_BIDI_CHAP_EN;
 492         else if (attr == &dev_attr_iface_discovery_auth_optional.attr)
 493                 param = ISCSI_IFACE_PARAM_DISCOVERY_AUTH_OPTIONAL;
 494         else if (attr == &dev_attr_iface_discovery_logout.attr)
 495                 param = ISCSI_IFACE_PARAM_DISCOVERY_LOGOUT_EN;
 496         else if (attr == &dev_attr_iface_strict_login_comp_en.attr)
 497                 param = ISCSI_IFACE_PARAM_STRICT_LOGIN_COMP_EN;
 498         else if (attr == &dev_attr_iface_initiator_name.attr)
 499                 param = ISCSI_IFACE_PARAM_INITIATOR_NAME;
 500         else if (iface->iface_type == ISCSI_IFACE_TYPE_IPV4) {
 501                 if (attr == &dev_attr_ipv4_iface_ipaddress.attr)
 502                         param = ISCSI_NET_PARAM_IPV4_ADDR;
 503                 else if (attr == &dev_attr_ipv4_iface_gateway.attr)
 504                         param = ISCSI_NET_PARAM_IPV4_GW;
 505                 else if (attr == &dev_attr_ipv4_iface_subnet.attr)
 506                         param = ISCSI_NET_PARAM_IPV4_SUBNET;
 507                 else if (attr == &dev_attr_ipv4_iface_bootproto.attr)
 508                         param = ISCSI_NET_PARAM_IPV4_BOOTPROTO;
 509                 else if (attr ==
 510                          &dev_attr_ipv4_iface_dhcp_dns_address_en.attr)
 511                         param = ISCSI_NET_PARAM_IPV4_DHCP_DNS_ADDR_EN;
 512                 else if (attr ==
 513                          &dev_attr_ipv4_iface_dhcp_slp_da_info_en.attr)
 514                         param = ISCSI_NET_PARAM_IPV4_DHCP_SLP_DA_EN;
 515                 else if (attr == &dev_attr_ipv4_iface_tos_en.attr)
 516                         param = ISCSI_NET_PARAM_IPV4_TOS_EN;
 517                 else if (attr == &dev_attr_ipv4_iface_tos.attr)
 518                         param = ISCSI_NET_PARAM_IPV4_TOS;
 519                 else if (attr == &dev_attr_ipv4_iface_grat_arp_en.attr)
 520                         param = ISCSI_NET_PARAM_IPV4_GRAT_ARP_EN;
 521                 else if (attr ==
 522                          &dev_attr_ipv4_iface_dhcp_alt_client_id_en.attr)
 523                         param = ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID_EN;
 524                 else if (attr == &dev_attr_ipv4_iface_dhcp_alt_client_id.attr)
 525                         param = ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID;
 526                 else if (attr ==
 527                          &dev_attr_ipv4_iface_dhcp_req_vendor_id_en.attr)
 528                         param = ISCSI_NET_PARAM_IPV4_DHCP_REQ_VENDOR_ID_EN;
 529                 else if (attr ==
 530                          &dev_attr_ipv4_iface_dhcp_use_vendor_id_en.attr)
 531                         param = ISCSI_NET_PARAM_IPV4_DHCP_USE_VENDOR_ID_EN;
 532                 else if (attr == &dev_attr_ipv4_iface_dhcp_vendor_id.attr)
 533                         param = ISCSI_NET_PARAM_IPV4_DHCP_VENDOR_ID;
 534                 else if (attr ==
 535                          &dev_attr_ipv4_iface_dhcp_learn_iqn_en.attr)
 536                         param = ISCSI_NET_PARAM_IPV4_DHCP_LEARN_IQN_EN;
 537                 else if (attr ==
 538                          &dev_attr_ipv4_iface_fragment_disable.attr)
 539                         param = ISCSI_NET_PARAM_IPV4_FRAGMENT_DISABLE;
 540                 else if (attr ==
 541                          &dev_attr_ipv4_iface_incoming_forwarding_en.attr)
 542                         param = ISCSI_NET_PARAM_IPV4_IN_FORWARD_EN;
 543                 else if (attr == &dev_attr_ipv4_iface_ttl.attr)
 544                         param = ISCSI_NET_PARAM_IPV4_TTL;
 545                 else
 546                         return 0;
 547         } else if (iface->iface_type == ISCSI_IFACE_TYPE_IPV6) {
 548                 if (attr == &dev_attr_ipv6_iface_ipaddress.attr)
 549                         param = ISCSI_NET_PARAM_IPV6_ADDR;
 550                 else if (attr == &dev_attr_ipv6_iface_link_local_addr.attr)
 551                         param = ISCSI_NET_PARAM_IPV6_LINKLOCAL;
 552                 else if (attr == &dev_attr_ipv6_iface_router_addr.attr)
 553                         param = ISCSI_NET_PARAM_IPV6_ROUTER;
 554                 else if (attr == &dev_attr_ipv6_iface_ipaddr_autocfg.attr)
 555                         param = ISCSI_NET_PARAM_IPV6_ADDR_AUTOCFG;
 556                 else if (attr == &dev_attr_ipv6_iface_link_local_autocfg.attr)
 557                         param = ISCSI_NET_PARAM_IPV6_LINKLOCAL_AUTOCFG;
 558                 else if (attr == &dev_attr_ipv6_iface_link_local_state.attr)
 559                         param = ISCSI_NET_PARAM_IPV6_LINKLOCAL_STATE;
 560                 else if (attr == &dev_attr_ipv6_iface_router_state.attr)
 561                         param = ISCSI_NET_PARAM_IPV6_ROUTER_STATE;
 562                 else if (attr ==
 563                          &dev_attr_ipv6_iface_grat_neighbor_adv_en.attr)
 564                         param = ISCSI_NET_PARAM_IPV6_GRAT_NEIGHBOR_ADV_EN;
 565                 else if (attr == &dev_attr_ipv6_iface_mld_en.attr)
 566                         param = ISCSI_NET_PARAM_IPV6_MLD_EN;
 567                 else if (attr == &dev_attr_ipv6_iface_flow_label.attr)
 568                         param = ISCSI_NET_PARAM_IPV6_FLOW_LABEL;
 569                 else if (attr == &dev_attr_ipv6_iface_traffic_class.attr)
 570                         param = ISCSI_NET_PARAM_IPV6_TRAFFIC_CLASS;
 571                 else if (attr == &dev_attr_ipv6_iface_hop_limit.attr)
 572                         param = ISCSI_NET_PARAM_IPV6_HOP_LIMIT;
 573                 else if (attr == &dev_attr_ipv6_iface_nd_reachable_tmo.attr)
 574                         param = ISCSI_NET_PARAM_IPV6_ND_REACHABLE_TMO;
 575                 else if (attr == &dev_attr_ipv6_iface_nd_rexmit_time.attr)
 576                         param = ISCSI_NET_PARAM_IPV6_ND_REXMIT_TIME;
 577                 else if (attr == &dev_attr_ipv6_iface_nd_stale_tmo.attr)
 578                         param = ISCSI_NET_PARAM_IPV6_ND_STALE_TMO;
 579                 else if (attr == &dev_attr_ipv6_iface_dup_addr_detect_cnt.attr)
 580                         param = ISCSI_NET_PARAM_IPV6_DUP_ADDR_DETECT_CNT;
 581                 else if (attr == &dev_attr_ipv6_iface_router_adv_link_mtu.attr)
 582                         param = ISCSI_NET_PARAM_IPV6_RTR_ADV_LINK_MTU;
 583                 else
 584                         return 0;
 585         } else {
 586                 WARN_ONCE(1, "Invalid iface attr");
 587                 return 0;
 588         }
 589
 590         switch (param) {
 591         case ISCSI_IFACE_PARAM_DEF_TASKMGMT_TMO:
 592         case ISCSI_IFACE_PARAM_HDRDGST_EN:
 593         case ISCSI_IFACE_PARAM_DATADGST_EN:
 594         case ISCSI_IFACE_PARAM_IMM_DATA_EN:
 595         case ISCSI_IFACE_PARAM_INITIAL_R2T_EN:
 596         case ISCSI_IFACE_PARAM_DATASEQ_INORDER_EN:
 597         case ISCSI_IFACE_PARAM_PDU_INORDER_EN:
 598         case ISCSI_IFACE_PARAM_ERL:
 599         case ISCSI_IFACE_PARAM_MAX_RECV_DLENGTH:
 600         case ISCSI_IFACE_PARAM_FIRST_BURST:
 601         case ISCSI_IFACE_PARAM_MAX_R2T:
 602         case ISCSI_IFACE_PARAM_MAX_BURST:
 603         case ISCSI_IFACE_PARAM_CHAP_AUTH_EN:
 604         case ISCSI_IFACE_PARAM_BIDI_CHAP_EN:
 605         case ISCSI_IFACE_PARAM_DISCOVERY_AUTH_OPTIONAL:
 606         case ISCSI_IFACE_PARAM_DISCOVERY_LOGOUT_EN:
 607         case ISCSI_IFACE_PARAM_STRICT_LOGIN_COMP_EN:
 608         case ISCSI_IFACE_PARAM_INITIATOR_NAME:
 609                 param_type = ISCSI_IFACE_PARAM;
 610                 break;
 611         default:
 612                 param_type = ISCSI_NET_PARAM;
 613         }
 614
 615         return t->attr_is_visible(param_type, param);
 616 }
 617
 618 static struct attribute *iscsi_iface_attrs[] = {
 619         &dev_attr_iface_enabled.attr,
 620         &dev_attr_iface_vlan_id.attr,
 621         &dev_attr_iface_vlan_priority.attr,
 622         &dev_attr_iface_vlan_enabled.attr,
 623         &dev_attr_ipv4_iface_ipaddress.attr,
 624         &dev_attr_ipv4_iface_gateway.attr,
 625         &dev_attr_ipv4_iface_subnet.attr,
 626         &dev_attr_ipv4_iface_bootproto.attr,
 627         &dev_attr_ipv6_iface_ipaddress.attr,
 628         &dev_attr_ipv6_iface_link_local_addr.attr,
 629         &dev_attr_ipv6_iface_router_addr.attr,
 630         &dev_attr_ipv6_iface_ipaddr_autocfg.attr,
 631         &dev_attr_ipv6_iface_link_local_autocfg.attr,
 632         &dev_attr_iface_mtu.attr,
 633         &dev_attr_iface_port.attr,
 634         &dev_attr_iface_ipaddress_state.attr,
 635         &dev_attr_iface_delayed_ack_en.attr,
 636         &dev_attr_iface_tcp_nagle_disable.attr,
 637         &dev_attr_iface_tcp_wsf_disable.attr,
 638         &dev_attr_iface_tcp_wsf.attr,
 639         &dev_attr_iface_tcp_timer_scale.attr,
 640         &dev_attr_iface_tcp_timestamp_en.attr,
 641         &dev_attr_iface_cache_id.attr,
 642         &dev_attr_iface_redirect_en.attr,
 643         &dev_attr_iface_def_taskmgmt_tmo.attr,
 644         &dev_attr_iface_header_digest.attr,
 645         &dev_attr_iface_data_digest.attr,
 646         &dev_attr_iface_immediate_data.attr,
 647         &dev_attr_iface_initial_r2t.attr,
 648         &dev_attr_iface_data_seq_in_order.attr,
 649         &dev_attr_iface_data_pdu_in_order.attr,
 650         &dev_attr_iface_erl.attr,
 651         &dev_attr_iface_max_recv_dlength.attr,
 652         &dev_attr_iface_first_burst_len.attr,
 653         &dev_attr_iface_max_outstanding_r2t.attr,
 654         &dev_attr_iface_max_burst_len.attr,
 655         &dev_attr_iface_chap_auth.attr,
 656         &dev_attr_iface_bidi_chap.attr,
 657         &dev_attr_iface_discovery_auth_optional.attr,
 658         &dev_attr_iface_discovery_logout.attr,
 659         &dev_attr_iface_strict_login_comp_en.attr,
 660         &dev_attr_iface_initiator_name.attr,
 661         &dev_attr_ipv4_iface_dhcp_dns_address_en.attr,
 662         &dev_attr_ipv4_iface_dhcp_slp_da_info_en.attr,
 663         &dev_attr_ipv4_iface_tos_en.attr,
 664         &dev_attr_ipv4_iface_tos.attr,
 665         &dev_attr_ipv4_iface_grat_arp_en.attr,
 666         &dev_attr_ipv4_iface_dhcp_alt_client_id_en.attr,
 667         &dev_attr_ipv4_iface_dhcp_alt_client_id.attr,
 668         &dev_attr_ipv4_iface_dhcp_req_vendor_id_en.attr,
 669         &dev_attr_ipv4_iface_dhcp_use_vendor_id_en.attr,
 670         &dev_attr_ipv4_iface_dhcp_vendor_id.attr,
 671         &dev_attr_ipv4_iface_dhcp_learn_iqn_en.attr,
 672         &dev_attr_ipv4_iface_fragment_disable.attr,
 673         &dev_attr_ipv4_iface_incoming_forwarding_en.attr,
 674         &dev_attr_ipv4_iface_ttl.attr,
 675         &dev_attr_ipv6_iface_link_local_state.attr,
 676         &dev_attr_ipv6_iface_router_state.attr,
 677         &dev_attr_ipv6_iface_grat_neighbor_adv_en.attr,
 678         &dev_attr_ipv6_iface_mld_en.attr,
 679         &dev_attr_ipv6_iface_flow_label.attr,
 680         &dev_attr_ipv6_iface_traffic_class.attr,
 681         &dev_attr_ipv6_iface_hop_limit.attr,
 682         &dev_attr_ipv6_iface_nd_reachable_tmo.attr,
 683         &dev_attr_ipv6_iface_nd_rexmit_time.attr,
 684         &dev_attr_ipv6_iface_nd_stale_tmo.attr,
 685         &dev_attr_ipv6_iface_dup_addr_detect_cnt.attr,
 686         &dev_attr_ipv6_iface_router_adv_link_mtu.attr,
 687         NULL,
 688 };
 689
 690 static struct attribute_group iscsi_iface_group = {
 691         .attrs = iscsi_iface_attrs,
 692         .is_visible = iscsi_iface_attr_is_visible,
 693 };
 694
 695 /* convert iscsi_ipaddress_state values to ascii string name */
 696 static const struct {
 697         enum iscsi_ipaddress_state      value;
 698         char                            *name;
 699 } iscsi_ipaddress_state_names[] = {
 700         {ISCSI_IPDDRESS_STATE_UNCONFIGURED,     "Unconfigured" },
 701         {ISCSI_IPDDRESS_STATE_ACQUIRING,        "Acquiring" },
 702         {ISCSI_IPDDRESS_STATE_TENTATIVE,        "Tentative" },
 703         {ISCSI_IPDDRESS_STATE_VALID,            "Valid" },
 704         {ISCSI_IPDDRESS_STATE_DISABLING,        "Disabling" },
 705         {ISCSI_IPDDRESS_STATE_INVALID,          "Invalid" },
 706         {ISCSI_IPDDRESS_STATE_DEPRECATED,       "Deprecated" },
 707 };
 708
 709 char *iscsi_get_ipaddress_state_name(enum iscsi_ipaddress_state port_state)
 710 {
 711         int i;
 712         char *state = NULL;
 713
 714         for (i = 0; i < ARRAY_SIZE(iscsi_ipaddress_state_names); i++) {
 715                 if (iscsi_ipaddress_state_names[i].value == port_state) {
 716                         state = iscsi_ipaddress_state_names[i].name;
 717                         break;
 718                 }
 719         }
 720         return state;
 721 }
 722 EXPORT_SYMBOL_GPL(iscsi_get_ipaddress_state_name);
 723
 724 /* convert iscsi_router_state values to ascii string name */
 725 static const struct {
 726         enum iscsi_router_state value;
 727         char                    *name;
 728 } iscsi_router_state_names[] = {
 729         {ISCSI_ROUTER_STATE_UNKNOWN,            "Unknown" },
 730         {ISCSI_ROUTER_STATE_ADVERTISED,         "Advertised" },
 731         {ISCSI_ROUTER_STATE_MANUAL,             "Manual" },
 732         {ISCSI_ROUTER_STATE_STALE,              "Stale" },
 733 };
 734
 735 char *iscsi_get_router_state_name(enum iscsi_router_state router_state)
 736 {
 737         int i;
 738         char *state = NULL;
 739
 740         for (i = 0; i < ARRAY_SIZE(iscsi_router_state_names); i++) {
 741                 if (iscsi_router_state_names[i].value == router_state) {
 742                         state = iscsi_router_state_names[i].name;
 743                         break;
 744                 }
 745         }
 746         return state;
 747 }
 748 EXPORT_SYMBOL_GPL(iscsi_get_router_state_name);
 749
 750 struct iscsi_iface *
 751 iscsi_create_iface(struct Scsi_Host *shost, struct iscsi_transport *transport,
 752                    uint32_t iface_type, uint32_t iface_num, int dd_size)
 753 {
 754         struct iscsi_iface *iface;
 755         int err;
 756
 757         iface = kzalloc(sizeof(*iface) + dd_size, GFP_KERNEL);
 758         if (!iface)
 759                 return NULL;
 760
 761         iface->transport = transport;
 762         iface->iface_type = iface_type;
 763         iface->iface_num = iface_num;
 764         iface->dev.release = iscsi_iface_release;
 765         iface->dev.class = &iscsi_iface_class;
 766         /* parent reference released in iscsi_iface_release */
 767         iface->dev.parent = get_device(&shost->shost_gendev);
 768         if (iface_type == ISCSI_IFACE_TYPE_IPV4)
 769                 dev_set_name(&iface->dev, "ipv4-iface-%u-%u", shost->host_no,
 770                              iface_num);
 771         else
 772                 dev_set_name(&iface->dev, "ipv6-iface-%u-%u", shost->host_no,
 773                              iface_num);
 774
 775         err = device_register(&iface->dev);
 776         if (err)
 777                 goto free_iface;
 778
 779         err = sysfs_create_group(&iface->dev.kobj, &iscsi_iface_group);
 780         if (err)
 781                 goto unreg_iface;
 782
 783         if (dd_size)
 784                 iface->dd_data = &iface[1];
 785         return iface;
 786
 787 unreg_iface:
 788         device_unregister(&iface->dev);
 789         return NULL;
 790
 791 free_iface:
 792         put_device(iface->dev.parent);
 793         kfree(iface);
 794         return NULL;
 795 }
 796 EXPORT_SYMBOL_GPL(iscsi_create_iface);
 797
 798 void iscsi_destroy_iface(struct iscsi_iface *iface)
 799 {
 800         sysfs_remove_group(&iface->dev.kobj, &iscsi_iface_group);
 801         device_unregister(&iface->dev);
 802 }
 803 EXPORT_SYMBOL_GPL(iscsi_destroy_iface);
 804
 805 /*
 806  * Interface to display flash node params to sysfs
 807  */
 808
 809 #define ISCSI_FLASHNODE_ATTR(_prefix, _name, _mode, _show, _store)      \
 810 struct device_attribute dev_attr_##_prefix##_##_name =                  \
 811         __ATTR(_name, _mode, _show, _store)
 812
 813 /* flash node session attrs show */
 814 #define iscsi_flashnode_sess_attr_show(type, name, param)               \
 815 static ssize_t                                                          \
 816 show_##type##_##name(struct device *dev, struct device_attribute *attr, \
 817                      char *buf)                                         \
 818 {                                                                       \
 819         struct iscsi_bus_flash_session *fnode_sess =                    \
 820                                         iscsi_dev_to_flash_session(dev);\
 821         struct iscsi_transport *t = fnode_sess->transport;              \
 822         return t->get_flashnode_param(fnode_sess, param, buf);          \
 823 }                                                                       \
 824
 825
 826 #define iscsi_flashnode_sess_attr(type, name, param)                    \
 827         iscsi_flashnode_sess_attr_show(type, name, param)               \
 828 static ISCSI_FLASHNODE_ATTR(type, name, S_IRUGO,                        \
 829                             show_##type##_##name, NULL);
 830
 831 /* Flash node session attributes */
 832
 833 iscsi_flashnode_sess_attr(fnode, auto_snd_tgt_disable,
 834                           ISCSI_FLASHNODE_AUTO_SND_TGT_DISABLE);
 835 iscsi_flashnode_sess_attr(fnode, discovery_session,
 836                           ISCSI_FLASHNODE_DISCOVERY_SESS);
 837 iscsi_flashnode_sess_attr(fnode, portal_type, ISCSI_FLASHNODE_PORTAL_TYPE);
 838 iscsi_flashnode_sess_attr(fnode, entry_enable, ISCSI_FLASHNODE_ENTRY_EN);
 839 iscsi_flashnode_sess_attr(fnode, immediate_data, ISCSI_FLASHNODE_IMM_DATA_EN);
 840 iscsi_flashnode_sess_attr(fnode, initial_r2t, ISCSI_FLASHNODE_INITIAL_R2T_EN);
 841 iscsi_flashnode_sess_attr(fnode, data_seq_in_order,
 842                           ISCSI_FLASHNODE_DATASEQ_INORDER);
 843 iscsi_flashnode_sess_attr(fnode, data_pdu_in_order,
 844                           ISCSI_FLASHNODE_PDU_INORDER);
 845 iscsi_flashnode_sess_attr(fnode, chap_auth, ISCSI_FLASHNODE_CHAP_AUTH_EN);
 846 iscsi_flashnode_sess_attr(fnode, discovery_logout,
 847                           ISCSI_FLASHNODE_DISCOVERY_LOGOUT_EN);
 848 iscsi_flashnode_sess_attr(fnode, bidi_chap, ISCSI_FLASHNODE_BIDI_CHAP_EN);
 849 iscsi_flashnode_sess_attr(fnode, discovery_auth_optional,
 850                           ISCSI_FLASHNODE_DISCOVERY_AUTH_OPTIONAL);
 851 iscsi_flashnode_sess_attr(fnode, erl, ISCSI_FLASHNODE_ERL);
 852 iscsi_flashnode_sess_attr(fnode, first_burst_len, ISCSI_FLASHNODE_FIRST_BURST);
 853 iscsi_flashnode_sess_attr(fnode, def_time2wait, ISCSI_FLASHNODE_DEF_TIME2WAIT);
 854 iscsi_flashnode_sess_attr(fnode, def_time2retain,
 855                           ISCSI_FLASHNODE_DEF_TIME2RETAIN);
 856 iscsi_flashnode_sess_attr(fnode, max_outstanding_r2t, ISCSI_FLASHNODE_MAX_R2T);
 857 iscsi_flashnode_sess_attr(fnode, isid, ISCSI_FLASHNODE_ISID);
 858 iscsi_flashnode_sess_attr(fnode, tsid, ISCSI_FLASHNODE_TSID);
 859 iscsi_flashnode_sess_attr(fnode, max_burst_len, ISCSI_FLASHNODE_MAX_BURST);
 860 iscsi_flashnode_sess_attr(fnode, def_taskmgmt_tmo,
 861                           ISCSI_FLASHNODE_DEF_TASKMGMT_TMO);
 862 iscsi_flashnode_sess_attr(fnode, targetalias, ISCSI_FLASHNODE_ALIAS);
 863 iscsi_flashnode_sess_attr(fnode, targetname, ISCSI_FLASHNODE_NAME);
 864 iscsi_flashnode_sess_attr(fnode, tpgt, ISCSI_FLASHNODE_TPGT);
 865 iscsi_flashnode_sess_attr(fnode, discovery_parent_idx,
 866                           ISCSI_FLASHNODE_DISCOVERY_PARENT_IDX);
 867 iscsi_flashnode_sess_attr(fnode, discovery_parent_type,
 868                           ISCSI_FLASHNODE_DISCOVERY_PARENT_TYPE);
 869 iscsi_flashnode_sess_attr(fnode, chap_in_idx, ISCSI_FLASHNODE_CHAP_IN_IDX);
 870 iscsi_flashnode_sess_attr(fnode, chap_out_idx, ISCSI_FLASHNODE_CHAP_OUT_IDX);
 871 iscsi_flashnode_sess_attr(fnode, username, ISCSI_FLASHNODE_USERNAME);
 872 iscsi_flashnode_sess_attr(fnode, username_in, ISCSI_FLASHNODE_USERNAME_IN);
 873 iscsi_flashnode_sess_attr(fnode, password, ISCSI_FLASHNODE_PASSWORD);
 874 iscsi_flashnode_sess_attr(fnode, password_in, ISCSI_FLASHNODE_PASSWORD_IN);
 875 iscsi_flashnode_sess_attr(fnode, is_boot_target, ISCSI_FLASHNODE_IS_BOOT_TGT);
 876
 877 static struct attribute *iscsi_flashnode_sess_attrs[] = {
 878         &dev_attr_fnode_auto_snd_tgt_disable.attr,
 879         &dev_attr_fnode_discovery_session.attr,
 880         &dev_attr_fnode_portal_type.attr,
 881         &dev_attr_fnode_entry_enable.attr,
 882         &dev_attr_fnode_immediate_data.attr,
 883         &dev_attr_fnode_initial_r2t.attr,
 884         &dev_attr_fnode_data_seq_in_order.attr,
 885         &dev_attr_fnode_data_pdu_in_order.attr,
 886         &dev_attr_fnode_chap_auth.attr,
 887         &dev_attr_fnode_discovery_logout.attr,
 888         &dev_attr_fnode_bidi_chap.attr,
 889         &dev_attr_fnode_discovery_auth_optional.attr,
 890         &dev_attr_fnode_erl.attr,
 891         &dev_attr_fnode_first_burst_len.attr,
 892         &dev_attr_fnode_def_time2wait.attr,
 893         &dev_attr_fnode_def_time2retain.attr,
 894         &dev_attr_fnode_max_outstanding_r2t.attr,
 895         &dev_attr_fnode_isid.attr,
 896         &dev_attr_fnode_tsid.attr,
 897         &dev_attr_fnode_max_burst_len.attr,
 898         &dev_attr_fnode_def_taskmgmt_tmo.attr,
 899         &dev_attr_fnode_targetalias.attr,
 900         &dev_attr_fnode_targetname.attr,
 901         &dev_attr_fnode_tpgt.attr,
 902         &dev_attr_fnode_discovery_parent_idx.attr,
 903         &dev_attr_fnode_discovery_parent_type.attr,
 904         &dev_attr_fnode_chap_in_idx.attr,
 905         &dev_attr_fnode_chap_out_idx.attr,
 906         &dev_attr_fnode_username.attr,
 907         &dev_attr_fnode_username_in.attr,
 908         &dev_attr_fnode_password.attr,
 909         &dev_attr_fnode_password_in.attr,
 910         &dev_attr_fnode_is_boot_target.attr,
 911         NULL,
 912 };
 913
 914 static umode_t iscsi_flashnode_sess_attr_is_visible(struct kobject *kobj,
 915                                                     struct attribute *attr,
 916                                                     int i)
 917 {
 918         struct device *dev = container_of(kobj, struct device, kobj);
 919         struct iscsi_bus_flash_session *fnode_sess =
 920                                                 iscsi_dev_to_flash_session(dev);
 921         struct iscsi_transport *t = fnode_sess->transport;
 922         int param;
 923
 924         if (attr == &dev_attr_fnode_auto_snd_tgt_disable.attr) {
 925                 param = ISCSI_FLASHNODE_AUTO_SND_TGT_DISABLE;
 926         } else if (attr == &dev_attr_fnode_discovery_session.attr) {
 927                 param = ISCSI_FLASHNODE_DISCOVERY_SESS;
 928         } else if (attr == &dev_attr_fnode_portal_type.attr) {
 929                 param = ISCSI_FLASHNODE_PORTAL_TYPE;
 930         } else if (attr == &dev_attr_fnode_entry_enable.attr) {
 931                 param = ISCSI_FLASHNODE_ENTRY_EN;
 932         } else if (attr == &dev_attr_fnode_immediate_data.attr) {
 933                 param = ISCSI_FLASHNODE_IMM_DATA_EN;
 934         } else if (attr == &dev_attr_fnode_initial_r2t.attr) {
 935                 param = ISCSI_FLASHNODE_INITIAL_R2T_EN;
 936         } else if (attr == &dev_attr_fnode_data_seq_in_order.attr) {
 937                 param = ISCSI_FLASHNODE_DATASEQ_INORDER;
 938         } else if (attr == &dev_attr_fnode_data_pdu_in_order.attr) {
 939                 param = ISCSI_FLASHNODE_PDU_INORDER;
 940         } else if (attr == &dev_attr_fnode_chap_auth.attr) {
 941                 param = ISCSI_FLASHNODE_CHAP_AUTH_EN;
 942         } else if (attr == &dev_attr_fnode_discovery_logout.attr) {
 943                 param = ISCSI_FLASHNODE_DISCOVERY_LOGOUT_EN;
 944         } else if (attr == &dev_attr_fnode_bidi_chap.attr) {
 945                 param = ISCSI_FLASHNODE_BIDI_CHAP_EN;
 946         } else if (attr == &dev_attr_fnode_discovery_auth_optional.attr) {
 947                 param = ISCSI_FLASHNODE_DISCOVERY_AUTH_OPTIONAL;
 948         } else if (attr == &dev_attr_fnode_erl.attr) {
 949                 param = ISCSI_FLASHNODE_ERL;
 950         } else if (attr == &dev_attr_fnode_first_burst_len.attr) {
 951                 param = ISCSI_FLASHNODE_FIRST_BURST;
 952         } else if (attr == &dev_attr_fnode_def_time2wait.attr) {
 953                 param = ISCSI_FLASHNODE_DEF_TIME2WAIT;
 954         } else if (attr == &dev_attr_fnode_def_time2retain.attr) {
 955                 param = ISCSI_FLASHNODE_DEF_TIME2RETAIN;
 956         } else if (attr == &dev_attr_fnode_max_outstanding_r2t.attr) {
 957                 param = ISCSI_FLASHNODE_MAX_R2T;
 958         } else if (attr == &dev_attr_fnode_isid.attr) {
 959                 param = ISCSI_FLASHNODE_ISID;
 960         } else if (attr == &dev_attr_fnode_tsid.attr) {
 961                 param = ISCSI_FLASHNODE_TSID;
 962         } else if (attr == &dev_attr_fnode_max_burst_len.attr) {
 963                 param = ISCSI_FLASHNODE_MAX_BURST;
 964         } else if (attr == &dev_attr_fnode_def_taskmgmt_tmo.attr) {
 965                 param = ISCSI_FLASHNODE_DEF_TASKMGMT_TMO;
 966         } else if (attr == &dev_attr_fnode_targetalias.attr) {
 967                 param = ISCSI_FLASHNODE_ALIAS;
 968         } else if (attr == &dev_attr_fnode_targetname.attr) {
 969                 param = ISCSI_FLASHNODE_NAME;
 970         } else if (attr == &dev_attr_fnode_tpgt.attr) {
 971                 param = ISCSI_FLASHNODE_TPGT;
 972         } else if (attr == &dev_attr_fnode_discovery_parent_idx.attr) {
 973                 param = ISCSI_FLASHNODE_DISCOVERY_PARENT_IDX;
 974         } else if (attr == &dev_attr_fnode_discovery_parent_type.attr) {
 975                 param = ISCSI_FLASHNODE_DISCOVERY_PARENT_TYPE;
 976         } else if (attr == &dev_attr_fnode_chap_in_idx.attr) {
 977                 param = ISCSI_FLASHNODE_CHAP_IN_IDX;
 978         } else if (attr == &dev_attr_fnode_chap_out_idx.attr) {
 979                 param = ISCSI_FLASHNODE_CHAP_OUT_IDX;
 980         } else if (attr == &dev_attr_fnode_username.attr) {
 981                 param = ISCSI_FLASHNODE_USERNAME;
 982         } else if (attr == &dev_attr_fnode_username_in.attr) {
 983                 param = ISCSI_FLASHNODE_USERNAME_IN;
 984         } else if (attr == &dev_attr_fnode_password.attr) {
 985                 param = ISCSI_FLASHNODE_PASSWORD;
 986         } else if (attr == &dev_attr_fnode_password_in.attr) {
 987                 param = ISCSI_FLASHNODE_PASSWORD_IN;
 988         } else if (attr == &dev_attr_fnode_is_boot_target.attr) {
 989                 param = ISCSI_FLASHNODE_IS_BOOT_TGT;
 990         } else {
 991                 WARN_ONCE(1, "Invalid flashnode session attr");
 992                 return 0;
 993         }
 994
 995         return t->attr_is_visible(ISCSI_FLASHNODE_PARAM, param);
 996 }
 997
 998 static struct attribute_group iscsi_flashnode_sess_attr_group = {
 999         .attrs = iscsi_flashnode_sess_attrs,
1000         .is_visible = iscsi_flashnode_sess_attr_is_visible,
1001 };
1002
1003 static const struct attribute_group *iscsi_flashnode_sess_attr_groups[] = {
1004         &iscsi_flashnode_sess_attr_group,
1005         NULL,
1006 };
1007
1008 static void iscsi_flashnode_sess_release(struct device *dev)
1009 {
1010         struct iscsi_bus_flash_session *fnode_sess =
1011                                                 iscsi_dev_to_flash_session(dev);
1012
1013         kfree(fnode_sess->targetname);
1014         kfree(fnode_sess->targetalias);
1015         kfree(fnode_sess->portal_type);
1016         kfree(fnode_sess);
1017 }
1018
1019 static const struct device_type iscsi_flashnode_sess_dev_type = {
1020         .name = "iscsi_flashnode_sess_dev_type",
1021         .groups = iscsi_flashnode_sess_attr_groups,
1022         .release = iscsi_flashnode_sess_release,
1023 };
1024
1025 /* flash node connection attrs show */
1026 #define iscsi_flashnode_conn_attr_show(type, name, param)               \
1027 static ssize_t                                                          \
1028 show_##type##_##name(struct device *dev, struct device_attribute *attr, \
1029                      char *buf)                                         \
1030 {                                                                       \
1031         struct iscsi_bus_flash_conn *fnode_conn = iscsi_dev_to_flash_conn(dev);\
1032         struct iscsi_bus_flash_session *fnode_sess =                    \
1033                                 iscsi_flash_conn_to_flash_session(fnode_conn);\
1034         struct iscsi_transport *t = fnode_conn->transport;              \
1035         return t->get_flashnode_param(fnode_sess, param, buf);          \
1036 }                                                                       \
1037
1038
1039 #define iscsi_flashnode_conn_attr(type, name, param)                    \
1040         iscsi_flashnode_conn_attr_show(type, name, param)               \
1041 static ISCSI_FLASHNODE_ATTR(type, name, S_IRUGO,                        \
1042                             show_##type##_##name, NULL);
1043
1044 /* Flash node connection attributes */
1045
1046 iscsi_flashnode_conn_attr(fnode, is_fw_assigned_ipv6,
1047                           ISCSI_FLASHNODE_IS_FW_ASSIGNED_IPV6);
1048 iscsi_flashnode_conn_attr(fnode, header_digest, ISCSI_FLASHNODE_HDR_DGST_EN);
1049 iscsi_flashnode_conn_attr(fnode, data_digest, ISCSI_FLASHNODE_DATA_DGST_EN);
1050 iscsi_flashnode_conn_attr(fnode, snack_req, ISCSI_FLASHNODE_SNACK_REQ_EN);
1051 iscsi_flashnode_conn_attr(fnode, tcp_timestamp_stat,
1052                           ISCSI_FLASHNODE_TCP_TIMESTAMP_STAT);
1053 iscsi_flashnode_conn_attr(fnode, tcp_nagle_disable,
1054                           ISCSI_FLASHNODE_TCP_NAGLE_DISABLE);
1055 iscsi_flashnode_conn_attr(fnode, tcp_wsf_disable,
1056                           ISCSI_FLASHNODE_TCP_WSF_DISABLE);
1057 iscsi_flashnode_conn_attr(fnode, tcp_timer_scale,
1058                           ISCSI_FLASHNODE_TCP_TIMER_SCALE);
1059 iscsi_flashnode_conn_attr(fnode, tcp_timestamp_enable,
1060                           ISCSI_FLASHNODE_TCP_TIMESTAMP_EN);
1061 iscsi_flashnode_conn_attr(fnode, fragment_disable,
1062                           ISCSI_FLASHNODE_IP_FRAG_DISABLE);
1063 iscsi_flashnode_conn_attr(fnode, keepalive_tmo, ISCSI_FLASHNODE_KEEPALIVE_TMO);
1064 iscsi_flashnode_conn_attr(fnode, port, ISCSI_FLASHNODE_PORT);
1065 iscsi_flashnode_conn_attr(fnode, ipaddress, ISCSI_FLASHNODE_IPADDR);
1066 iscsi_flashnode_conn_attr(fnode, max_recv_dlength,
1067                           ISCSI_FLASHNODE_MAX_RECV_DLENGTH);
1068 iscsi_flashnode_conn_attr(fnode, max_xmit_dlength,
1069                           ISCSI_FLASHNODE_MAX_XMIT_DLENGTH);
1070 iscsi_flashnode_conn_attr(fnode, local_port, ISCSI_FLASHNODE_LOCAL_PORT);
1071 iscsi_flashnode_conn_attr(fnode, ipv4_tos, ISCSI_FLASHNODE_IPV4_TOS);
1072 iscsi_flashnode_conn_attr(fnode, ipv6_traffic_class, ISCSI_FLASHNODE_IPV6_TC);
1073 iscsi_flashnode_conn_attr(fnode, ipv6_flow_label,
1074                           ISCSI_FLASHNODE_IPV6_FLOW_LABEL);
1075 iscsi_flashnode_conn_attr(fnode, redirect_ipaddr,
1076                           ISCSI_FLASHNODE_REDIRECT_IPADDR);
1077 iscsi_flashnode_conn_attr(fnode, max_segment_size,
1078                           ISCSI_FLASHNODE_MAX_SEGMENT_SIZE);
1079 iscsi_flashnode_conn_attr(fnode, link_local_ipv6,
1080                           ISCSI_FLASHNODE_LINK_LOCAL_IPV6);
1081 iscsi_flashnode_conn_attr(fnode, tcp_xmit_wsf, ISCSI_FLASHNODE_TCP_XMIT_WSF);
1082 iscsi_flashnode_conn_attr(fnode, tcp_recv_wsf, ISCSI_FLASHNODE_TCP_RECV_WSF);
1083 iscsi_flashnode_conn_attr(fnode, statsn, ISCSI_FLASHNODE_STATSN);
1084 iscsi_flashnode_conn_attr(fnode, exp_statsn, ISCSI_FLASHNODE_EXP_STATSN);
1085
1086 static struct attribute *iscsi_flashnode_conn_attrs[] = {
1087         &dev_attr_fnode_is_fw_assigned_ipv6.attr,
1088         &dev_attr_fnode_header_digest.attr,
1089         &dev_attr_fnode_data_digest.attr,
1090         &dev_attr_fnode_snack_req.attr,
1091         &dev_attr_fnode_tcp_timestamp_stat.attr,
1092         &dev_attr_fnode_tcp_nagle_disable.attr,
1093         &dev_attr_fnode_tcp_wsf_disable.attr,
1094         &dev_attr_fnode_tcp_timer_scale.attr,
1095         &dev_attr_fnode_tcp_timestamp_enable.attr,
1096         &dev_attr_fnode_fragment_disable.attr,
1097         &dev_attr_fnode_max_recv_dlength.attr,
1098         &dev_attr_fnode_max_xmit_dlength.attr,
1099         &dev_attr_fnode_keepalive_tmo.attr,
1100         &dev_attr_fnode_port.attr,
1101         &dev_attr_fnode_ipaddress.attr,
1102         &dev_attr_fnode_redirect_ipaddr.attr,
1103         &dev_attr_fnode_max_segment_size.attr,
1104         &dev_attr_fnode_local_port.attr,
1105         &dev_attr_fnode_ipv4_tos.attr,
1106         &dev_attr_fnode_ipv6_traffic_class.attr,
1107         &dev_attr_fnode_ipv6_flow_label.attr,
1108         &dev_attr_fnode_link_local_ipv6.attr,
1109         &dev_attr_fnode_tcp_xmit_wsf.attr,
1110         &dev_attr_fnode_tcp_recv_wsf.attr,
1111         &dev_attr_fnode_statsn.attr,
1112         &dev_attr_fnode_exp_statsn.attr,
1113         NULL,
1114 };
1115
1116 static umode_t iscsi_flashnode_conn_attr_is_visible(struct kobject *kobj,
1117                                                     struct attribute *attr,
1118                                                     int i)
1119 {
1120         struct device *dev = container_of(kobj, struct device, kobj);
1121         struct iscsi_bus_flash_conn *fnode_conn = iscsi_dev_to_flash_conn(dev);
1122         struct iscsi_transport *t = fnode_conn->transport;
1123         int param;
1124
1125         if (attr == &dev_attr_fnode_is_fw_assigned_ipv6.attr) {
1126                 param = ISCSI_FLASHNODE_IS_FW_ASSIGNED_IPV6;
1127         } else if (attr == &dev_attr_fnode_header_digest.attr) {
1128                 param = ISCSI_FLASHNODE_HDR_DGST_EN;
1129         } else if (attr == &dev_attr_fnode_data_digest.attr) {
1130                 param = ISCSI_FLASHNODE_DATA_DGST_EN;
1131         } else if (attr == &dev_attr_fnode_snack_req.attr) {
1132                 param = ISCSI_FLASHNODE_SNACK_REQ_EN;
1133         } else if (attr == &dev_attr_fnode_tcp_timestamp_stat.attr) {
1134                 param = ISCSI_FLASHNODE_TCP_TIMESTAMP_STAT;
1135         } else if (attr == &dev_attr_fnode_tcp_nagle_disable.attr) {
1136                 param = ISCSI_FLASHNODE_TCP_NAGLE_DISABLE;
1137         } else if (attr == &dev_attr_fnode_tcp_wsf_disable.attr) {
1138                 param = ISCSI_FLASHNODE_TCP_WSF_DISABLE;
1139         } else if (attr == &dev_attr_fnode_tcp_timer_scale.attr) {
1140                 param = ISCSI_FLASHNODE_TCP_TIMER_SCALE;
1141         } else if (attr == &dev_attr_fnode_tcp_timestamp_enable.attr) {
1142                 param = ISCSI_FLASHNODE_TCP_TIMESTAMP_EN;
1143         } else if (attr == &dev_attr_fnode_fragment_disable.attr) {
1144                 param = ISCSI_FLASHNODE_IP_FRAG_DISABLE;
1145         } else if (attr == &dev_attr_fnode_max_recv_dlength.attr) {
1146                 param = ISCSI_FLASHNODE_MAX_RECV_DLENGTH;
1147         } else if (attr == &dev_attr_fnode_max_xmit_dlength.attr) {
1148                 param = ISCSI_FLASHNODE_MAX_XMIT_DLENGTH;
1149         } else if (attr == &dev_attr_fnode_keepalive_tmo.attr) {
1150                 param = ISCSI_FLASHNODE_KEEPALIVE_TMO;
1151         } else if (attr == &dev_attr_fnode_port.attr) {
1152                 param = ISCSI_FLASHNODE_PORT;
1153         } else if (attr == &dev_attr_fnode_ipaddress.attr) {
1154                 param = ISCSI_FLASHNODE_IPADDR;
1155         } else if (attr == &dev_attr_fnode_redirect_ipaddr.attr) {
1156                 param = ISCSI_FLASHNODE_REDIRECT_IPADDR;
1157         } else if (attr == &dev_attr_fnode_max_segment_size.attr) {
1158                 param = ISCSI_FLASHNODE_MAX_SEGMENT_SIZE;
1159         } else if (attr == &dev_attr_fnode_local_port.attr) {
1160                 param = ISCSI_FLASHNODE_LOCAL_PORT;
1161         } else if (attr == &dev_attr_fnode_ipv4_tos.attr) {
1162                 param = ISCSI_FLASHNODE_IPV4_TOS;
1163         } else if (attr == &dev_attr_fnode_ipv6_traffic_class.attr) {
1164                 param = ISCSI_FLASHNODE_IPV6_TC;
1165         } else if (attr == &dev_attr_fnode_ipv6_flow_label.attr) {
1166                 param = ISCSI_FLASHNODE_IPV6_FLOW_LABEL;
1167         } else if (attr == &dev_attr_fnode_link_local_ipv6.attr) {
1168                 param = ISCSI_FLASHNODE_LINK_LOCAL_IPV6;
1169         } else if (attr == &dev_attr_fnode_tcp_xmit_wsf.attr) {
1170                 param = ISCSI_FLASHNODE_TCP_XMIT_WSF;
1171         } else if (attr == &dev_attr_fnode_tcp_recv_wsf.attr) {
1172                 param = ISCSI_FLASHNODE_TCP_RECV_WSF;
1173         } else if (attr == &dev_attr_fnode_statsn.attr) {
1174                 param = ISCSI_FLASHNODE_STATSN;
1175         } else if (attr == &dev_attr_fnode_exp_statsn.attr) {
1176                 param = ISCSI_FLASHNODE_EXP_STATSN;
1177         } else {
1178                 WARN_ONCE(1, "Invalid flashnode connection attr");
1179                 return 0;
1180         }
1181
1182         return t->attr_is_visible(ISCSI_FLASHNODE_PARAM, param);
1183 }
1184
1185 static struct attribute_group iscsi_flashnode_conn_attr_group = {
1186         .attrs = iscsi_flashnode_conn_attrs,
1187         .is_visible = iscsi_flashnode_conn_attr_is_visible,
1188 };
1189
1190 static const struct attribute_group *iscsi_flashnode_conn_attr_groups[] = {
1191         &iscsi_flashnode_conn_attr_group,
1192         NULL,
1193 };
1194
1195 static void iscsi_flashnode_conn_release(struct device *dev)
1196 {
1197         struct iscsi_bus_flash_conn *fnode_conn = iscsi_dev_to_flash_conn(dev);
1198
1199         kfree(fnode_conn->ipaddress);
1200         kfree(fnode_conn->redirect_ipaddr);
1201         kfree(fnode_conn->link_local_ipv6_addr);
1202         kfree(fnode_conn);
1203 }
1204
1205 static const struct device_type iscsi_flashnode_conn_dev_type = {
1206         .name = "iscsi_flashnode_conn_dev_type",
1207         .groups = iscsi_flashnode_conn_attr_groups,
1208         .release = iscsi_flashnode_conn_release,
1209 };
1210
1211 static struct bus_type iscsi_flashnode_bus;
1212
1213 int iscsi_flashnode_bus_match(struct device *dev,
1214                                      struct device_driver *drv)
1215 {
1216         if (dev->bus == &iscsi_flashnode_bus)
1217                 return 1;
1218         return 0;
1219 }
1220 EXPORT_SYMBOL_GPL(iscsi_flashnode_bus_match);
1221
1222 static struct bus_type iscsi_flashnode_bus = {
1223         .name = "iscsi_flashnode",
1224         .match = &iscsi_flashnode_bus_match,
1225 };
1226
1227 /**
1228  * iscsi_create_flashnode_sess - Add flashnode session entry in sysfs
1229  * @shost: pointer to host data
1230  * @index: index of flashnode to add in sysfs
1231  * @transport: pointer to transport data
1232  * @dd_size: total size to allocate
1233  *
1234  * Adds a sysfs entry for the flashnode session attributes
1235  *
1236  * Returns:
1237  *  pointer to allocated flashnode sess on success
1238  *  %NULL on failure
1239  */
1240 struct iscsi_bus_flash_session *
1241 iscsi_create_flashnode_sess(struct Scsi_Host *shost, int index,
1242                             struct iscsi_transport *transport,
1243                             int dd_size)
1244 {
1245         struct iscsi_bus_flash_session *fnode_sess;
1246         int err;
1247
1248         fnode_sess = kzalloc(sizeof(*fnode_sess) + dd_size, GFP_KERNEL);
1249         if (!fnode_sess)
1250                 return NULL;
1251
1252         fnode_sess->transport = transport;
1253         fnode_sess->target_id = index;
1254         fnode_sess->dev.type = &iscsi_flashnode_sess_dev_type;
1255         fnode_sess->dev.bus = &iscsi_flashnode_bus;
1256         fnode_sess->dev.parent = &shost->shost_gendev;
1257         dev_set_name(&fnode_sess->dev, "flashnode_sess-%u:%u",
1258                      shost->host_no, index);
1259
1260         err = device_register(&fnode_sess->dev);
1261         if (err)
1262                 goto free_fnode_sess;
1263
1264         if (dd_size)
1265                 fnode_sess->dd_data = &fnode_sess[1];
1266
1267         return fnode_sess;
1268
1269 free_fnode_sess:
1270         kfree(fnode_sess);
1271         return NULL;
1272 }
1273 EXPORT_SYMBOL_GPL(iscsi_create_flashnode_sess);
1274
1275 /**
1276  * iscsi_create_flashnode_conn - Add flashnode conn entry in sysfs
1277  * @shost: pointer to host data
1278  * @fnode_sess: pointer to the parent flashnode session entry
1279  * @transport: pointer to transport data
1280  * @dd_size: total size to allocate
1281  *
1282  * Adds a sysfs entry for the flashnode connection attributes
1283  *
1284  * Returns:
1285  *  pointer to allocated flashnode conn on success
1286  *  %NULL on failure
1287  */
1288 struct iscsi_bus_flash_conn *
1289 iscsi_create_flashnode_conn(struct Scsi_Host *shost,
1290                             struct iscsi_bus_flash_session *fnode_sess,
1291                             struct iscsi_transport *transport,
1292                             int dd_size)
1293 {
1294         struct iscsi_bus_flash_conn *fnode_conn;
1295         int err;
1296
1297         fnode_conn = kzalloc(sizeof(*fnode_conn) + dd_size, GFP_KERNEL);
1298         if (!fnode_conn)
1299                 return NULL;
1300
1301         fnode_conn->transport = transport;
1302         fnode_conn->dev.type = &iscsi_flashnode_conn_dev_type;
1303         fnode_conn->dev.bus = &iscsi_flashnode_bus;
1304         fnode_conn->dev.parent = &fnode_sess->dev;
1305         dev_set_name(&fnode_conn->dev, "flashnode_conn-%u:%u:0",
1306                      shost->host_no, fnode_sess->target_id);
1307
1308         err = device_register(&fnode_conn->dev);
1309         if (err)
1310                 goto free_fnode_conn;
1311
1312         if (dd_size)
1313                 fnode_conn->dd_data = &fnode_conn[1];
1314
1315         return fnode_conn;
1316
1317 free_fnode_conn:
1318         kfree(fnode_conn);
1319         return NULL;
1320 }
1321 EXPORT_SYMBOL_GPL(iscsi_create_flashnode_conn);
1322
1323 /**
1324  * iscsi_is_flashnode_conn_dev - verify passed device is to be flashnode conn
1325  * @dev: device to verify
1326  * @data: pointer to data containing value to use for verification
1327  *
1328  * Verifies if the passed device is flashnode conn device
1329  *
1330  * Returns:
1331  *  1 on success
1332  *  0 on failure
1333  */
1334 static int iscsi_is_flashnode_conn_dev(struct device *dev, void *data)
1335 {
1336         return dev->bus == &iscsi_flashnode_bus;
1337 }
1338
1339 static int iscsi_destroy_flashnode_conn(struct iscsi_bus_flash_conn *fnode_conn)
1340 {
1341         device_unregister(&fnode_conn->dev);
1342         return 0;
1343 }
1344
1345 static int flashnode_match_index(struct device *dev, void *data)
1346 {
1347         struct iscsi_bus_flash_session *fnode_sess = NULL;
1348         int ret = 0;
1349
1350         if (!iscsi_flashnode_bus_match(dev, NULL))
1351                 goto exit_match_index;
1352
1353         fnode_sess = iscsi_dev_to_flash_session(dev);
1354         ret = (fnode_sess->target_id == *((int *)data)) ? 1 : 0;
1355
1356 exit_match_index:
1357         return ret;
1358 }
1359
1360 /**
1361  * iscsi_get_flashnode_by_index -finds flashnode session entry by index
1362  * @shost: pointer to host data
1363  * @idx: index to match
1364  *
1365  * Finds the flashnode session object for the passed index
1366  *
1367  * Returns:
1368  *  pointer to found flashnode session object on success
1369  *  %NULL on failure
1370  */
1371 static struct iscsi_bus_flash_session *
1372 iscsi_get_flashnode_by_index(struct Scsi_Host *shost, uint32_t idx)
1373 {
1374         struct iscsi_bus_flash_session *fnode_sess = NULL;
1375         struct device *dev;
1376
1377         dev = device_find_child(&shost->shost_gendev, &idx,
1378                                 flashnode_match_index);
1379         if (dev)
1380                 fnode_sess = iscsi_dev_to_flash_session(dev);
1381
1382         return fnode_sess;
1383 }
1384
1385 /**
1386  * iscsi_find_flashnode_sess - finds flashnode session entry
1387  * @shost: pointer to host data
1388  * @data: pointer to data containing value to use for comparison
1389  * @fn: function pointer that does actual comparison
1390  *
1391  * Finds the flashnode session object comparing the data passed using logic
1392  * defined in passed function pointer
1393  *
1394  * Returns:
1395  *  pointer to found flashnode session device object on success
1396  *  %NULL on failure
1397  */
1398 struct device *
1399 iscsi_find_flashnode_sess(struct Scsi_Host *shost, void *data,
1400                           int (*fn)(struct device *dev, void *data))
1401 {
1402         return device_find_child(&shost->shost_gendev, data, fn);
1403 }
1404 EXPORT_SYMBOL_GPL(iscsi_find_flashnode_sess);
1405
1406 /**
1407  * iscsi_find_flashnode_conn - finds flashnode connection entry
1408  * @fnode_sess: pointer to parent flashnode session entry
1409  *
1410  * Finds the flashnode connection object comparing the data passed using logic
1411  * defined in passed function pointer
1412  *
1413  * Returns:
1414  *  pointer to found flashnode connection device object on success
1415  *  %NULL on failure
1416  */
1417 struct device *
1418 iscsi_find_flashnode_conn(struct iscsi_bus_flash_session *fnode_sess)
1419 {
1420         return device_find_child(&fnode_sess->dev, NULL,
1421                                  iscsi_is_flashnode_conn_dev);
1422 }
1423 EXPORT_SYMBOL_GPL(iscsi_find_flashnode_conn);
1424
1425 static int iscsi_iter_destroy_flashnode_conn_fn(struct device *dev, void *data)
1426 {
1427         if (!iscsi_is_flashnode_conn_dev(dev, NULL))
1428                 return 0;
1429
1430         return iscsi_destroy_flashnode_conn(iscsi_dev_to_flash_conn(dev));
1431 }
1432
1433 /**
1434  * iscsi_destroy_flashnode_sess - destroy flashnode session entry
1435  * @fnode_sess: pointer to flashnode session entry to be destroyed
1436  *
1437  * Deletes the flashnode session entry and all children flashnode connection
1438  * entries from sysfs
1439  */
1440 void iscsi_destroy_flashnode_sess(struct iscsi_bus_flash_session *fnode_sess)
1441 {
1442         int err;
1443
1444         err = device_for_each_child(&fnode_sess->dev, NULL,
1445                                     iscsi_iter_destroy_flashnode_conn_fn);
1446         if (err)
1447                 pr_err("Could not delete all connections for %s. Error %d.\n",
1448                        fnode_sess->dev.kobj.name, err);
1449
1450         device_unregister(&fnode_sess->dev);
1451 }
1452 EXPORT_SYMBOL_GPL(iscsi_destroy_flashnode_sess);
1453
1454 static int iscsi_iter_destroy_flashnode_fn(struct device *dev, void *data)
1455 {
1456         if (!iscsi_flashnode_bus_match(dev, NULL))
1457                 return 0;
1458
1459         iscsi_destroy_flashnode_sess(iscsi_dev_to_flash_session(dev));
1460         return 0;
1461 }
1462
1463 /**
1464  * iscsi_destroy_all_flashnode - destroy all flashnode session entries
1465  * @shost: pointer to host data
1466  *
1467  * Destroys all the flashnode session entries and all corresponding children
1468  * flashnode connection entries from sysfs
1469  */
1470 void iscsi_destroy_all_flashnode(struct Scsi_Host *shost)
1471 {
1472         device_for_each_child(&shost->shost_gendev, NULL,
1473                               iscsi_iter_destroy_flashnode_fn);
1474 }
1475 EXPORT_SYMBOL_GPL(iscsi_destroy_all_flashnode);
1476
1477 /*
1478  * BSG support
1479  */
1480 /**
1481  * iscsi_bsg_host_dispatch - Dispatch command to LLD.
1482  * @job: bsg job to be processed
1483  */
1484 static int iscsi_bsg_host_dispatch(struct bsg_job *job)
1485 {
1486         struct Scsi_Host *shost = iscsi_job_to_shost(job);
1487         struct iscsi_bsg_request *req = job->request;
1488         struct iscsi_bsg_reply *reply = job->reply;
1489         struct iscsi_internal *i = to_iscsi_internal(shost->transportt);
1490         int cmdlen = sizeof(uint32_t);  /* start with length of msgcode */
1491         int ret;
1492
1493         /* check if we have the msgcode value at least */
1494         if (job->request_len < sizeof(uint32_t)) {
1495                 ret = -ENOMSG;
1496                 goto fail_host_msg;
1497         }
1498
1499         /* Validate the host command */
1500         switch (req->msgcode) {
1501         case ISCSI_BSG_HST_VENDOR:
1502                 cmdlen += sizeof(struct iscsi_bsg_host_vendor);
1503                 if ((shost->hostt->vendor_id == 0L) ||
1504                     (req->rqst_data.h_vendor.vendor_id !=
1505                         shost->hostt->vendor_id)) {
1506                         ret = -ESRCH;
1507                         goto fail_host_msg;
1508                 }
1509                 break;
1510         default:
1511                 ret = -EBADR;
1512                 goto fail_host_msg;
1513         }
1514
1515         /* check if we really have all the request data needed */
1516         if (job->request_len < cmdlen) {
1517                 ret = -ENOMSG;
1518                 goto fail_host_msg;
1519         }
1520
1521         ret = i->iscsi_transport->bsg_request(job);
1522         if (!ret)
1523                 return 0;
1524
1525 fail_host_msg:
1526         /* return the errno failure code as the only status */
1527         BUG_ON(job->reply_len < sizeof(uint32_t));
1528         reply->reply_payload_rcv_len = 0;
1529         reply->result = ret;
1530         job->reply_len = sizeof(uint32_t);
1531         bsg_job_done(job, ret, 0);
1532         return 0;
1533 }
1534
1535 /**
1536  * iscsi_bsg_host_add - Create and add the bsg hooks to receive requests
1537  * @shost: shost for iscsi_host
1538  * @ihost: iscsi_cls_host adding the structures to
1539  */
1540 static int
1541 iscsi_bsg_host_add(struct Scsi_Host *shost, struct iscsi_cls_host *ihost)
1542 {
1543         struct device *dev = &shost->shost_gendev;
1544         struct iscsi_internal *i = to_iscsi_internal(shost->transportt);
1545         struct request_queue *q;
1546         char bsg_name[20];
1547
1548         if (!i->iscsi_transport->bsg_request)
1549                 return -ENOTSUPP;
1550
1551         snprintf(bsg_name, sizeof(bsg_name), "iscsi_host%d", shost->host_no);
1552         q = bsg_setup_queue(dev, bsg_name, iscsi_bsg_host_dispatch, NULL, 0);
1553         if (IS_ERR(q)) {
1554                 shost_printk(KERN_ERR, shost, "bsg interface failed to "
1555                              "initialize - no request queue\n");
1556                 return PTR_ERR(q);
1557         }
1558         __scsi_init_queue(shost, q);
1559
1560         ihost->bsg_q = q;
1561         return 0;
1562 }
1563
1564 static int iscsi_setup_host(struct transport_container *tc, struct device *dev,
1565                             struct device *cdev)
1566 {
1567         struct Scsi_Host *shost = dev_to_shost(dev);
1568         struct iscsi_cls_host *ihost = shost->shost_data;
1569
1570         memset(ihost, 0, sizeof(*ihost));
1571         atomic_set(&ihost->nr_scans, 0);
1572         mutex_init(&ihost->mutex);
1573
1574         iscsi_bsg_host_add(shost, ihost);
1575         /* ignore any bsg add error - we just can't do sgio */
1576
1577         return 0;
1578 }
1579
1580 static int iscsi_remove_host(struct transport_container *tc,
1581                              struct device *dev, struct device *cdev)
1582 {
1583         struct Scsi_Host *shost = dev_to_shost(dev);
1584         struct iscsi_cls_host *ihost = shost->shost_data;
1585
1586         bsg_remove_queue(ihost->bsg_q);
1587         return 0;
1588 }
1589
1590 static DECLARE_TRANSPORT_CLASS(iscsi_host_class,
1591                                "iscsi_host",
1592                                iscsi_setup_host,
1593                                iscsi_remove_host,
1594                                NULL);
1595
1596 static DECLARE_TRANSPORT_CLASS(iscsi_session_class,
1597                                "iscsi_session",
1598                                NULL,
1599                                NULL,
1600                                NULL);
1601
1602 static DECLARE_TRANSPORT_CLASS(iscsi_connection_class,
1603                                "iscsi_connection",
1604                                NULL,
1605                                NULL,
1606                                NULL);
1607
1608 static struct sock *nls;
1609 static DEFINE_MUTEX(rx_queue_mutex);
1610
1611 static LIST_HEAD(sesslist);
1612 static DEFINE_SPINLOCK(sesslock);
1613 static LIST_HEAD(connlist);
1614 static DEFINE_SPINLOCK(connlock);
1615
1616 static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn *conn)
1617 {
1618         struct iscsi_cls_session *sess = iscsi_dev_to_session(conn->dev.parent);
1619         return sess->sid;
1620 }
1621
1622 /*
1623  * Returns the matching session to a given sid
1624  */
1625 static struct iscsi_cls_session *iscsi_session_lookup(uint32_t sid)
1626 {
1627         unsigned long flags;
1628         struct iscsi_cls_session *sess;
1629
1630         spin_lock_irqsave(&sesslock, flags);
1631         list_for_each_entry(sess, &sesslist, sess_list) {
1632                 if (sess->sid == sid) {
1633                         spin_unlock_irqrestore(&sesslock, flags);
1634                         return sess;
1635                 }
1636         }
1637         spin_unlock_irqrestore(&sesslock, flags);
1638         return NULL;
1639 }
1640
1641 /*
1642  * Returns the matching connection to a given sid / cid tuple
1643  */
1644 static struct iscsi_cls_conn *iscsi_conn_lookup(uint32_t sid, uint32_t cid)
1645 {
1646         unsigned long flags;
1647         struct iscsi_cls_conn *conn;
1648
1649         spin_lock_irqsave(&connlock, flags);
1650         list_for_each_entry(conn, &connlist, conn_list) {
1651                 if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) {
1652                         spin_unlock_irqrestore(&connlock, flags);
1653                         return conn;
1654                 }
1655         }
1656         spin_unlock_irqrestore(&connlock, flags);
1657         return NULL;
1658 }
1659
1660 /*
1661  * The following functions can be used by LLDs that allocate
1662  * their own scsi_hosts or by software iscsi LLDs
1663  */
1664 static struct {
1665         int value;
1666         char *name;
1667 } iscsi_session_state_names[] = {
1668         { ISCSI_SESSION_LOGGED_IN,      "LOGGED_IN" },
1669         { ISCSI_SESSION_FAILED,         "FAILED" },
1670         { ISCSI_SESSION_FREE,           "FREE" },
1671 };
1672
1673 static const char *iscsi_session_state_name(int state)
1674 {
1675         int i;
1676         char *name = NULL;
1677
1678         for (i = 0; i < ARRAY_SIZE(iscsi_session_state_names); i++) {
1679                 if (iscsi_session_state_names[i].value == state) {
1680                         name = iscsi_session_state_names[i].name;
1681                         break;
1682                 }
1683         }
1684         return name;
1685 }
1686
1687 int iscsi_session_chkready(struct iscsi_cls_session *session)
1688 {
1689         unsigned long flags;
1690         int err;
1691
1692         spin_lock_irqsave(&session->lock, flags);
1693         switch (session->state) {
1694         case ISCSI_SESSION_LOGGED_IN:
1695                 err = 0;
1696                 break;
1697         case ISCSI_SESSION_FAILED:
1698                 err = DID_IMM_RETRY << 16;
1699                 break;
1700         case ISCSI_SESSION_FREE:
1701                 err = DID_TRANSPORT_FAILFAST << 16;
1702                 break;
1703         default:
1704                 err = DID_NO_CONNECT << 16;
1705                 break;
1706         }
1707         spin_unlock_irqrestore(&session->lock, flags);
1708         return err;
1709 }
1710 EXPORT_SYMBOL_GPL(iscsi_session_chkready);
1711
1712 int iscsi_is_session_online(struct iscsi_cls_session *session)
1713 {
1714         unsigned long flags;
1715         int ret = 0;
1716
1717         spin_lock_irqsave(&session->lock, flags);
1718         if (session->state == ISCSI_SESSION_LOGGED_IN)
1719                 ret = 1;
1720         spin_unlock_irqrestore(&session->lock, flags);
1721         return ret;
1722 }
1723 EXPORT_SYMBOL_GPL(iscsi_is_session_online);
1724
1725 static void iscsi_session_release(struct device *dev)
1726 {
1727         struct iscsi_cls_session *session = iscsi_dev_to_session(dev);
1728         struct Scsi_Host *shost;
1729
1730         shost = iscsi_session_to_shost(session);
1731         scsi_host_put(shost);
1732         ISCSI_DBG_TRANS_SESSION(session, "Completing session release\n");
1733         kfree(session);
1734 }
1735
1736 int iscsi_is_session_dev(const struct device *dev)
1737 {
1738         return dev->release == iscsi_session_release;
1739 }
1740 EXPORT_SYMBOL_GPL(iscsi_is_session_dev);
1741
1742 static int iscsi_iter_session_fn(struct device *dev, void *data)
1743 {
1744         void (* fn) (struct iscsi_cls_session *) = data;
1745
1746         if (!iscsi_is_session_dev(dev))
1747                 return 0;
1748         fn(iscsi_dev_to_session(dev));
1749         return 0;
1750 }
1751
1752 void iscsi_host_for_each_session(struct Scsi_Host *shost,
1753                                  void (*fn)(struct iscsi_cls_session *))
1754 {
1755         device_for_each_child(&shost->shost_gendev, fn,
1756                               iscsi_iter_session_fn);
1757 }
1758 EXPORT_SYMBOL_GPL(iscsi_host_for_each_session);
1759
1760 /**
1761  * iscsi_scan_finished - helper to report when running scans are done
1762  * @shost: scsi host
1763  * @time: scan run time
1764  *
1765  * This function can be used by drives like qla4xxx to report to the scsi
1766  * layer when the scans it kicked off at module load time are done.
1767  */
1768 int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time)
1769 {
1770         struct iscsi_cls_host *ihost = shost->shost_data;
1771         /*
1772          * qla4xxx will have kicked off some session unblocks before calling
1773          * scsi_scan_host, so just wait for them to complete.
1774          */
1775         return !atomic_read(&ihost->nr_scans);
1776 }
1777 EXPORT_SYMBOL_GPL(iscsi_scan_finished);
1778
1779 struct iscsi_scan_data {
1780         unsigned int channel;
1781         unsigned int id;
1782         u64 lun;
1783         enum scsi_scan_mode rescan;
1784 };
1785
1786 static int iscsi_user_scan_session(struct device *dev, void *data)
1787 {
1788         struct iscsi_scan_data *scan_data = data;
1789         struct iscsi_cls_session *session;
1790         struct Scsi_Host *shost;
1791         struct iscsi_cls_host *ihost;
1792         unsigned long flags;
1793         unsigned int id;
1794
1795         if (!iscsi_is_session_dev(dev))
1796                 return 0;
1797
1798         session = iscsi_dev_to_session(dev);
1799
1800         ISCSI_DBG_TRANS_SESSION(session, "Scanning session\n");
1801
1802         shost = iscsi_session_to_shost(session);
1803         ihost = shost->shost_data;
1804
1805         mutex_lock(&ihost->mutex);
1806         spin_lock_irqsave(&session->lock, flags);
1807         if (session->state != ISCSI_SESSION_LOGGED_IN) {
1808                 spin_unlock_irqrestore(&session->lock, flags);
1809                 goto user_scan_exit;
1810         }
1811         id = session->target_id;
1812         spin_unlock_irqrestore(&session->lock, flags);
1813
1814         if (id != ISCSI_MAX_TARGET) {
1815                 if ((scan_data->channel == SCAN_WILD_CARD ||
1816                      scan_data->channel == 0) &&
1817                     (scan_data->id == SCAN_WILD_CARD ||
1818                      scan_data->id == id))
1819                         scsi_scan_target(&session->dev, 0, id,
1820                                          scan_data->lun, scan_data->rescan);
1821         }
1822
1823 user_scan_exit:
1824         mutex_unlock(&ihost->mutex);
1825         ISCSI_DBG_TRANS_SESSION(session, "Completed session scan\n");
1826         return 0;
1827 }
1828
1829 static int iscsi_user_scan(struct Scsi_Host *shost, uint channel,
1830                            uint id, u64 lun)
1831 {
1832         struct iscsi_scan_data scan_data;
1833
1834         scan_data.channel = channel;
1835         scan_data.id = id;
1836         scan_data.lun = lun;
1837         scan_data.rescan = SCSI_SCAN_MANUAL;
1838
1839         return device_for_each_child(&shost->shost_gendev, &scan_data,
1840                                      iscsi_user_scan_session);
1841 }
1842
1843 static void iscsi_scan_session(struct work_struct *work)
1844 {
1845         struct iscsi_cls_session *session =
1846                         container_of(work, struct iscsi_cls_session, scan_work);
1847         struct Scsi_Host *shost = iscsi_session_to_shost(session);
1848         struct iscsi_cls_host *ihost = shost->shost_data;
1849         struct iscsi_scan_data scan_data;
1850
1851         scan_data.channel = 0;
1852         scan_data.id = SCAN_WILD_CARD;
1853         scan_data.lun = SCAN_WILD_CARD;
1854         scan_data.rescan = SCSI_SCAN_RESCAN;
1855
1856         iscsi_user_scan_session(&session->dev, &scan_data);
1857         atomic_dec(&ihost->nr_scans);
1858 }
1859
1860 /**
1861  * iscsi_block_scsi_eh - block scsi eh until session state has transistioned
1862  * @cmd: scsi cmd passed to scsi eh handler
1863  *
1864  * If the session is down this function will wait for the recovery
1865  * timer to fire or for the session to be logged back in. If the
1866  * recovery timer fires then FAST_IO_FAIL is returned. The caller
1867  * should pass this error value to the scsi eh.
1868  */
1869 int iscsi_block_scsi_eh(struct scsi_cmnd *cmd)
1870 {
1871         struct iscsi_cls_session *session =
1872                         starget_to_session(scsi_target(cmd->device));
1873         unsigned long flags;
1874         int ret = 0;
1875
1876         spin_lock_irqsave(&session->lock, flags);
1877         while (session->state != ISCSI_SESSION_LOGGED_IN) {
1878                 if (session->state == ISCSI_SESSION_FREE) {
1879                         ret = FAST_IO_FAIL;
1880                         break;
1881                 }
1882                 spin_unlock_irqrestore(&session->lock, flags);
1883                 msleep(1000);
1884                 spin_lock_irqsave(&session->lock, flags);
1885         }
1886         spin_unlock_irqrestore(&session->lock, flags);
1887         return ret;
1888 }
1889 EXPORT_SYMBOL_GPL(iscsi_block_scsi_eh);
1890
1891 static void session_recovery_timedout(struct work_struct *work)
1892 {
1893         struct iscsi_cls_session *session =
1894                 container_of(work, struct iscsi_cls_session,
1895                              recovery_work.work);
1896         unsigned long flags;
1897
1898         iscsi_cls_session_printk(KERN_INFO, session,
1899                                  "session recovery timed out after %d secs\n",
1900                                  session->recovery_tmo);
1901
1902         spin_lock_irqsave(&session->lock, flags);
1903         switch (session->state) {
1904         case ISCSI_SESSION_FAILED:
1905                 session->state = ISCSI_SESSION_FREE;
1906                 break;
1907         case ISCSI_SESSION_LOGGED_IN:
1908         case ISCSI_SESSION_FREE:
1909                 /* we raced with the unblock's flush */
1910                 spin_unlock_irqrestore(&session->lock, flags);
1911                 return;
1912         }
1913         spin_unlock_irqrestore(&session->lock, flags);
1914
1915         if (session->transport->session_recovery_timedout)
1916                 session->transport->session_recovery_timedout(session);
1917
1918         ISCSI_DBG_TRANS_SESSION(session, "Unblocking SCSI target\n");
1919         scsi_target_unblock(&session->dev, SDEV_TRANSPORT_OFFLINE);
1920         ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking SCSI target\n");
1921 }
1922
1923 static void __iscsi_unblock_session(struct work_struct *work)
1924 {
1925         struct iscsi_cls_session *session =
1926                         container_of(work, struct iscsi_cls_session,
1927                                      unblock_work);
1928         struct Scsi_Host *shost = iscsi_session_to_shost(session);
1929         struct iscsi_cls_host *ihost = shost->shost_data;
1930         unsigned long flags;
1931
1932         ISCSI_DBG_TRANS_SESSION(session, "Unblocking session\n");
1933         /*
1934          * The recovery and unblock work get run from the same workqueue,
1935          * so try to cancel it if it was going to run after this unblock.
1936          */
1937         cancel_delayed_work(&session->recovery_work);
1938         spin_lock_irqsave(&session->lock, flags);
1939         session->state = ISCSI_SESSION_LOGGED_IN;
1940         spin_unlock_irqrestore(&session->lock, flags);
1941         /* start IO */
1942         scsi_target_unblock(&session->dev, SDEV_RUNNING);
1943         /*
1944          * Only do kernel scanning if the driver is properly hooked into
1945          * the async scanning code (drivers like iscsi_tcp do login and
1946          * scanning from userspace).
1947          */
1948         if (shost->hostt->scan_finished) {
1949                 if (scsi_queue_work(shost, &session->scan_work))
1950                         atomic_inc(&ihost->nr_scans);
1951         }
1952         ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking session\n");
1953 }
1954
1955 /**
1956  * iscsi_unblock_session - set a session as logged in and start IO.
1957  * @session: iscsi session
1958  *
1959  * Mark a session as ready to accept IO.
1960  */
1961 void iscsi_unblock_session(struct iscsi_cls_session *session)
1962 {
1963         queue_work(iscsi_eh_timer_workq, &session->unblock_work);
1964         /*
1965          * make sure all the events have completed before tell the driver
1966          * it is safe
1967          */
1968         flush_workqueue(iscsi_eh_timer_workq);
1969 }
1970 EXPORT_SYMBOL_GPL(iscsi_unblock_session);
1971
1972 static void __iscsi_block_session(struct work_struct *work)
1973 {
1974         struct iscsi_cls_session *session =
1975                         container_of(work, struct iscsi_cls_session,
1976                                      block_work);
1977         unsigned long flags;
1978
1979         ISCSI_DBG_TRANS_SESSION(session, "Blocking session\n");
1980         spin_lock_irqsave(&session->lock, flags);
1981         session->state = ISCSI_SESSION_FAILED;
1982         spin_unlock_irqrestore(&session->lock, flags);
1983         scsi_target_block(&session->dev);
1984         ISCSI_DBG_TRANS_SESSION(session, "Completed SCSI target blocking\n");
1985         if (session->recovery_tmo >= 0)
1986                 queue_delayed_work(iscsi_eh_timer_workq,
1987                                    &session->recovery_work,
1988                                    session->recovery_tmo * HZ);
1989 }
1990
1991 void iscsi_block_session(struct iscsi_cls_session *session)
1992 {
1993         queue_work(iscsi_eh_timer_workq, &session->block_work);
1994 }
1995 EXPORT_SYMBOL_GPL(iscsi_block_session);
1996
1997 static void __iscsi_unbind_session(struct work_struct *work)
1998 {
1999         struct iscsi_cls_session *session =
2000                         container_of(work, struct iscsi_cls_session,
2001                                      unbind_work);
2002         struct Scsi_Host *shost = iscsi_session_to_shost(session);
2003         struct iscsi_cls_host *ihost = shost->shost_data;
2004         unsigned long flags;
2005         unsigned int target_id;
2006
2007         ISCSI_DBG_TRANS_SESSION(session, "Unbinding session\n");
2008
2009         /* Prevent new scans and make sure scanning is not in progress */
2010         mutex_lock(&ihost->mutex);
2011         spin_lock_irqsave(&session->lock, flags);
2012         if (session->target_id == ISCSI_MAX_TARGET) {
2013                 spin_unlock_irqrestore(&session->lock, flags);
2014                 mutex_unlock(&ihost->mutex);
2015                 return;
2016         }
2017
2018         target_id = session->target_id;
2019         session->target_id = ISCSI_MAX_TARGET;
2020         spin_unlock_irqrestore(&session->lock, flags);
2021         mutex_unlock(&ihost->mutex);
2022
2023         if (session->ida_used)
2024                 ida_simple_remove(&iscsi_sess_ida, target_id);
2025
2026         scsi_remove_target(&session->dev);
2027         iscsi_session_event(session, ISCSI_KEVENT_UNBIND_SESSION);
2028         ISCSI_DBG_TRANS_SESSION(session, "Completed target removal\n");
2029 }
2030
2031 struct iscsi_cls_session *
2032 iscsi_alloc_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
2033                     int dd_size)
2034 {
2035         struct iscsi_cls_session *session;
2036
2037         session = kzalloc(sizeof(*session) + dd_size,
2038                           GFP_KERNEL);
2039         if (!session)
2040                 return NULL;
2041
2042         session->transport = transport;
2043         session->creator = -1;
2044         session->recovery_tmo = 120;
2045         session->recovery_tmo_sysfs_override = false;
2046         session->state = ISCSI_SESSION_FREE;
2047         INIT_DELAYED_WORK(&session->recovery_work, session_recovery_timedout);
2048         INIT_LIST_HEAD(&session->sess_list);
2049         INIT_WORK(&session->unblock_work, __iscsi_unblock_session);
2050         INIT_WORK(&session->block_work, __iscsi_block_session);
2051         INIT_WORK(&session->unbind_work, __iscsi_unbind_session);
2052         INIT_WORK(&session->scan_work, iscsi_scan_session);
2053         spin_lock_init(&session->lock);
2054
2055         /* this is released in the dev's release function */
2056         scsi_host_get(shost);
2057         session->dev.parent = &shost->shost_gendev;
2058         session->dev.release = iscsi_session_release;
2059         device_initialize(&session->dev);
2060         if (dd_size)
2061                 session->dd_data = &session[1];
2062
2063         ISCSI_DBG_TRANS_SESSION(session, "Completed session allocation\n");
2064         return session;
2065 }
2066 EXPORT_SYMBOL_GPL(iscsi_alloc_session);
2067
2068 int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id)
2069 {
2070         unsigned long flags;
2071         int id = 0;
2072         int err;
2073
2074         session->sid = atomic_add_return(1, &iscsi_session_nr);
2075
2076         if (target_id == ISCSI_MAX_TARGET) {
2077                 id = ida_simple_get(&iscsi_sess_ida, 0, 0, GFP_KERNEL);
2078
2079                 if (id < 0) {
2080                         iscsi_cls_session_printk(KERN_ERR, session,
2081                                         "Failure in Target ID Allocation\n");
2082                         return id;
2083                 }
2084                 session->target_id = (unsigned int)id;
2085                 session->ida_used = true;
2086         } else
2087                 session->target_id = target_id;
2088
2089         dev_set_name(&session->dev, "session%u", session->sid);
2090         err = device_add(&session->dev);
2091         if (err) {
2092                 iscsi_cls_session_printk(KERN_ERR, session,
2093                                          "could not register session's dev\n");
2094                 goto release_ida;
2095         }
2096         err = transport_register_device(&session->dev);
2097         if (err) {
2098                 iscsi_cls_session_printk(KERN_ERR, session,
2099                                          "could not register transport's dev\n");
2100                 goto release_dev;
2101         }
2102
2103         spin_lock_irqsave(&sesslock, flags);
2104         list_add(&session->sess_list, &sesslist);
2105         spin_unlock_irqrestore(&sesslock, flags);
2106
2107         iscsi_session_event(session, ISCSI_KEVENT_CREATE_SESSION);
2108         ISCSI_DBG_TRANS_SESSION(session, "Completed session adding\n");
2109         return 0;
2110
2111 release_dev:
2112         device_del(&session->dev);
2113 release_ida:
2114         if (session->ida_used)
2115                 ida_simple_remove(&iscsi_sess_ida, session->target_id);
2116
2117         return err;
2118 }
2119 EXPORT_SYMBOL_GPL(iscsi_add_session);
2120
2121 /**
2122  * iscsi_create_session - create iscsi class session
2123  * @shost: scsi host
2124  * @transport: iscsi transport
2125  * @dd_size: private driver data size
2126  * @target_id: which target
2127  *
2128  * This can be called from a LLD or iscsi_transport.
2129  */
2130 struct iscsi_cls_session *
2131 iscsi_create_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
2132                      int dd_size, unsigned int target_id)
2133 {
2134         struct iscsi_cls_session *session;
2135
2136         session = iscsi_alloc_session(shost, transport, dd_size);
2137         if (!session)
2138                 return NULL;
2139
2140         if (iscsi_add_session(session, target_id)) {
2141                 iscsi_free_session(session);
2142                 return NULL;
2143         }
2144         return session;
2145 }
2146 EXPORT_SYMBOL_GPL(iscsi_create_session);
2147
2148 static void iscsi_conn_release(struct device *dev)
2149 {
2150         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev);
2151         struct device *parent = conn->dev.parent;
2152
2153         ISCSI_DBG_TRANS_CONN(conn, "Releasing conn\n");
2154         kfree(conn);
2155         put_device(parent);
2156 }
2157
2158 static int iscsi_is_conn_dev(const struct device *dev)
2159 {
2160         return dev->release == iscsi_conn_release;
2161 }
2162
2163 static int iscsi_iter_destroy_conn_fn(struct device *dev, void *data)
2164 {
2165         if (!iscsi_is_conn_dev(dev))
2166                 return 0;
2167         return iscsi_destroy_conn(iscsi_dev_to_conn(dev));
2168 }
2169
2170 void iscsi_remove_session(struct iscsi_cls_session *session)
2171 {
2172         unsigned long flags;
2173         int err;
2174
2175         ISCSI_DBG_TRANS_SESSION(session, "Removing session\n");
2176
2177         spin_lock_irqsave(&sesslock, flags);
2178         list_del(&session->sess_list);
2179         spin_unlock_irqrestore(&sesslock, flags);
2180
2181         /* make sure there are no blocks/unblocks queued */
2182         flush_workqueue(iscsi_eh_timer_workq);
2183         /* make sure the timedout callout is not running */
2184         if (!cancel_delayed_work(&session->recovery_work))
2185                 flush_workqueue(iscsi_eh_timer_workq);
2186         /*
2187          * If we are blocked let commands flow again. The lld or iscsi
2188          * layer should set up the queuecommand to fail commands.
2189          * We assume that LLD will not be calling block/unblock while
2190          * removing the session.
2191          */
2192         spin_lock_irqsave(&session->lock, flags);
2193         session->state = ISCSI_SESSION_FREE;
2194         spin_unlock_irqrestore(&session->lock, flags);
2195
2196         scsi_target_unblock(&session->dev, SDEV_TRANSPORT_OFFLINE);
2197         /* flush running scans then delete devices */
2198         flush_work(&session->scan_work);
2199         /* flush running unbind operations */
2200         flush_work(&session->unbind_work);
2201         __iscsi_unbind_session(&session->unbind_work);
2202
2203         /* hw iscsi may not have removed all connections from session */
2204         err = device_for_each_child(&session->dev, NULL,
2205                                     iscsi_iter_destroy_conn_fn);
2206         if (err)
2207                 iscsi_cls_session_printk(KERN_ERR, session,
2208                                          "Could not delete all connections "
2209                                          "for session. Error %d.\n", err);
2210
2211         transport_unregister_device(&session->dev);
2212
2213         ISCSI_DBG_TRANS_SESSION(session, "Completing session removal\n");
2214         device_del(&session->dev);
2215 }
2216 EXPORT_SYMBOL_GPL(iscsi_remove_session);
2217
2218 void iscsi_free_session(struct iscsi_cls_session *session)
2219 {
2220         ISCSI_DBG_TRANS_SESSION(session, "Freeing session\n");
2221         iscsi_session_event(session, ISCSI_KEVENT_DESTROY_SESSION);
2222         put_device(&session->dev);
2223 }
2224 EXPORT_SYMBOL_GPL(iscsi_free_session);
2225
2226 /**
2227  * iscsi_create_conn - create iscsi class connection
2228  * @session: iscsi cls session
2229  * @dd_size: private driver data size
2230  * @cid: connection id
2231  *
2232  * This can be called from a LLD or iscsi_transport. The connection
2233  * is child of the session so cid must be unique for all connections
2234  * on the session.
2235  *
2236  * Since we do not support MCS, cid will normally be zero. In some cases
2237  * for software iscsi we could be trying to preallocate a connection struct
2238  * in which case there could be two connection structs and cid would be
2239  * non-zero.
2240  */
2241 struct iscsi_cls_conn *
2242 iscsi_create_conn(struct iscsi_cls_session *session, int dd_size, uint32_t cid)
2243 {
2244         struct iscsi_transport *transport = session->transport;
2245         struct iscsi_cls_conn *conn;
2246         unsigned long flags;
2247         int err;
2248
2249         conn = kzalloc(sizeof(*conn) + dd_size, GFP_KERNEL);
2250         if (!conn)
2251                 return NULL;
2252         if (dd_size)
2253                 conn->dd_data = &conn[1];
2254
2255         mutex_init(&conn->ep_mutex);
2256         INIT_LIST_HEAD(&conn->conn_list);
2257         conn->transport = transport;
2258         conn->cid = cid;
2259
2260         /* this is released in the dev's release function */
2261         if (!get_device(&session->dev))
2262                 goto free_conn;
2263
2264         dev_set_name(&conn->dev, "connection%d:%u", session->sid, cid);
2265         conn->dev.parent = &session->dev;
2266         conn->dev.release = iscsi_conn_release;
2267         err = device_register(&conn->dev);
2268         if (err) {
2269                 iscsi_cls_session_printk(KERN_ERR, session, "could not "
2270                                          "register connection's dev\n");
2271                 goto release_parent_ref;
2272         }
2273         err = transport_register_device(&conn->dev);
2274         if (err) {
2275                 iscsi_cls_session_printk(KERN_ERR, session, "could not "
2276                                          "register transport's dev\n");
2277                 goto release_conn_ref;
2278         }
2279
2280         spin_lock_irqsave(&connlock, flags);
2281         list_add(&conn->conn_list, &connlist);
2282         spin_unlock_irqrestore(&connlock, flags);
2283
2284         ISCSI_DBG_TRANS_CONN(conn, "Completed conn creation\n");
2285         return conn;
2286
2287 release_conn_ref:
2288         put_device(&conn->dev);
2289 release_parent_ref:
2290         put_device(&session->dev);
2291 free_conn:
2292         kfree(conn);
2293         return NULL;
2294 }
2295
2296 EXPORT_SYMBOL_GPL(iscsi_create_conn);
2297
2298 /**
2299  * iscsi_destroy_conn - destroy iscsi class connection
2300  * @conn: iscsi cls session
2301  *
2302  * This can be called from a LLD or iscsi_transport.
2303  */
2304 int iscsi_destroy_conn(struct iscsi_cls_conn *conn)
2305 {
2306         unsigned long flags;
2307
2308         spin_lock_irqsave(&connlock, flags);
2309         list_del(&conn->conn_list);
2310         spin_unlock_irqrestore(&connlock, flags);
2311
2312         transport_unregister_device(&conn->dev);
2313         ISCSI_DBG_TRANS_CONN(conn, "Completing conn destruction\n");
2314         device_unregister(&conn->dev);
2315         return 0;
2316 }
2317 EXPORT_SYMBOL_GPL(iscsi_destroy_conn);
2318
2319 /*
2320  * iscsi interface functions
2321  */
2322 static struct iscsi_internal *
2323 iscsi_if_transport_lookup(struct iscsi_transport *tt)
2324 {
2325         struct iscsi_internal *priv;
2326         unsigned long flags;
2327
2328         spin_lock_irqsave(&iscsi_transport_lock, flags);
2329         list_for_each_entry(priv, &iscsi_transports, list) {
2330                 if (tt == priv->iscsi_transport) {
2331                         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2332                         return priv;
2333                 }
2334         }
2335         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2336         return NULL;
2337 }
2338
2339 static int
2340 iscsi_multicast_skb(struct sk_buff *skb, uint32_t group, gfp_t gfp)
2341 {
2342         return nlmsg_multicast(nls, skb, 0, group, gfp);
2343 }
2344
2345 static int
2346 iscsi_unicast_skb(struct sk_buff *skb, u32 portid)
2347 {
2348         return nlmsg_unicast(nls, skb, portid);
2349 }
2350
2351 int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
2352                    char *data, uint32_t data_size)
2353 {
2354         struct nlmsghdr *nlh;
2355         struct sk_buff *skb;
2356         struct iscsi_uevent *ev;
2357         char *pdu;
2358         struct iscsi_internal *priv;
2359         int len = nlmsg_total_size(sizeof(*ev) + sizeof(struct iscsi_hdr) +
2360                                    data_size);
2361
2362         priv = iscsi_if_transport_lookup(conn->transport);
2363         if (!priv)
2364                 return -EINVAL;
2365
2366         skb = alloc_skb(len, GFP_ATOMIC);
2367         if (!skb) {
2368                 iscsi_conn_error_event(conn, ISCSI_ERR_CONN_FAILED);
2369                 iscsi_cls_conn_printk(KERN_ERR, conn, "can not deliver "
2370                                       "control PDU: OOM\n");
2371                 return -ENOMEM;
2372         }
2373
2374         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2375         ev = nlmsg_data(nlh);
2376         memset(ev, 0, sizeof(*ev));
2377         ev->transport_handle = iscsi_handle(conn->transport);
2378         ev->type = ISCSI_KEVENT_RECV_PDU;
2379         ev->r.recv_req.cid = conn->cid;
2380         ev->r.recv_req.sid = iscsi_conn_get_sid(conn);
2381         pdu = (char*)ev + sizeof(*ev);
2382         memcpy(pdu, hdr, sizeof(struct iscsi_hdr));
2383         memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size);
2384
2385         return iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2386 }
2387 EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
2388
2389 int iscsi_offload_mesg(struct Scsi_Host *shost,
2390                        struct iscsi_transport *transport, uint32_t type,
2391                        char *data, uint16_t data_size)
2392 {
2393         struct nlmsghdr *nlh;
2394         struct sk_buff *skb;
2395         struct iscsi_uevent *ev;
2396         int len = nlmsg_total_size(sizeof(*ev) + data_size);
2397
2398         skb = alloc_skb(len, GFP_ATOMIC);
2399         if (!skb) {
2400                 printk(KERN_ERR "can not deliver iscsi offload message:OOM\n");
2401                 return -ENOMEM;
2402         }
2403
2404         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2405         ev = nlmsg_data(nlh);
2406         memset(ev, 0, sizeof(*ev));
2407         ev->type = type;
2408         ev->transport_handle = iscsi_handle(transport);
2409         switch (type) {
2410         case ISCSI_KEVENT_PATH_REQ:
2411                 ev->r.req_path.host_no = shost->host_no;
2412                 break;
2413         case ISCSI_KEVENT_IF_DOWN:
2414                 ev->r.notify_if_down.host_no = shost->host_no;
2415                 break;
2416         }
2417
2418         memcpy((char *)ev + sizeof(*ev), data, data_size);
2419
2420         return iscsi_multicast_skb(skb, ISCSI_NL_GRP_UIP, GFP_ATOMIC);
2421 }
2422 EXPORT_SYMBOL_GPL(iscsi_offload_mesg);
2423
2424 void iscsi_conn_error_event(struct iscsi_cls_conn *conn, enum iscsi_err error)
2425 {
2426         struct nlmsghdr *nlh;
2427         struct sk_buff  *skb;
2428         struct iscsi_uevent *ev;
2429         struct iscsi_internal *priv;
2430         int len = nlmsg_total_size(sizeof(*ev));
2431
2432         priv = iscsi_if_transport_lookup(conn->transport);
2433         if (!priv)
2434                 return;
2435
2436         skb = alloc_skb(len, GFP_ATOMIC);
2437         if (!skb) {
2438                 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
2439                                       "conn error (%d)\n", error);
2440                 return;
2441         }
2442
2443         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2444         ev = nlmsg_data(nlh);
2445         ev->transport_handle = iscsi_handle(conn->transport);
2446         ev->type = ISCSI_KEVENT_CONN_ERROR;
2447         ev->r.connerror.error = error;
2448         ev->r.connerror.cid = conn->cid;
2449         ev->r.connerror.sid = iscsi_conn_get_sid(conn);
2450
2451         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2452
2453         iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn error (%d)\n",
2454                               error);
2455 }
2456 EXPORT_SYMBOL_GPL(iscsi_conn_error_event);
2457
2458 void iscsi_conn_login_event(struct iscsi_cls_conn *conn,
2459                             enum iscsi_conn_state state)
2460 {
2461         struct nlmsghdr *nlh;
2462         struct sk_buff  *skb;
2463         struct iscsi_uevent *ev;
2464         struct iscsi_internal *priv;
2465         int len = nlmsg_total_size(sizeof(*ev));
2466
2467         priv = iscsi_if_transport_lookup(conn->transport);
2468         if (!priv)
2469                 return;
2470
2471         skb = alloc_skb(len, GFP_ATOMIC);
2472         if (!skb) {
2473                 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
2474                                       "conn login (%d)\n", state);
2475                 return;
2476         }
2477
2478         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2479         ev = nlmsg_data(nlh);
2480         ev->transport_handle = iscsi_handle(conn->transport);
2481         ev->type = ISCSI_KEVENT_CONN_LOGIN_STATE;
2482         ev->r.conn_login.state = state;
2483         ev->r.conn_login.cid = conn->cid;
2484         ev->r.conn_login.sid = iscsi_conn_get_sid(conn);
2485         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2486
2487         iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn login (%d)\n",
2488                               state);
2489 }
2490 EXPORT_SYMBOL_GPL(iscsi_conn_login_event);
2491
2492 void iscsi_post_host_event(uint32_t host_no, struct iscsi_transport *transport,
2493                            enum iscsi_host_event_code code, uint32_t data_size,
2494                            uint8_t *data)
2495 {
2496         struct nlmsghdr *nlh;
2497         struct sk_buff *skb;
2498         struct iscsi_uevent *ev;
2499         int len = nlmsg_total_size(sizeof(*ev) + data_size);
2500
2501         skb = alloc_skb(len, GFP_NOIO);
2502         if (!skb) {
2503                 printk(KERN_ERR "gracefully ignored host event (%d):%d OOM\n",
2504                        host_no, code);
2505                 return;
2506         }
2507
2508         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2509         ev = nlmsg_data(nlh);
2510         ev->transport_handle = iscsi_handle(transport);
2511         ev->type = ISCSI_KEVENT_HOST_EVENT;
2512         ev->r.host_event.host_no = host_no;
2513         ev->r.host_event.code = code;
2514         ev->r.host_event.data_size = data_size;
2515
2516         if (data_size)
2517                 memcpy((char *)ev + sizeof(*ev), data, data_size);
2518
2519         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_NOIO);
2520 }
2521 EXPORT_SYMBOL_GPL(iscsi_post_host_event);
2522
2523 void iscsi_ping_comp_event(uint32_t host_no, struct iscsi_transport *transport,
2524                            uint32_t status, uint32_t pid, uint32_t data_size,
2525                            uint8_t *data)
2526 {
2527         struct nlmsghdr *nlh;
2528         struct sk_buff *skb;
2529         struct iscsi_uevent *ev;
2530         int len = nlmsg_total_size(sizeof(*ev) + data_size);
2531
2532         skb = alloc_skb(len, GFP_NOIO);
2533         if (!skb) {
2534                 printk(KERN_ERR "gracefully ignored ping comp: OOM\n");
2535                 return;
2536         }
2537
2538         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2539         ev = nlmsg_data(nlh);
2540         ev->transport_handle = iscsi_handle(transport);
2541         ev->type = ISCSI_KEVENT_PING_COMP;
2542         ev->r.ping_comp.host_no = host_no;
2543         ev->r.ping_comp.status = status;
2544         ev->r.ping_comp.pid = pid;
2545         ev->r.ping_comp.data_size = data_size;
2546         memcpy((char *)ev + sizeof(*ev), data, data_size);
2547
2548         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_NOIO);
2549 }
2550 EXPORT_SYMBOL_GPL(iscsi_ping_comp_event);
2551
2552 static int
2553 iscsi_if_send_reply(u32 portid, int type, void *payload, int size)
2554 {
2555         struct sk_buff  *skb;
2556         struct nlmsghdr *nlh;
2557         int len = nlmsg_total_size(size);
2558
2559         skb = alloc_skb(len, GFP_ATOMIC);
2560         if (!skb) {
2561                 printk(KERN_ERR "Could not allocate skb to send reply.\n");
2562                 return -ENOMEM;
2563         }
2564
2565         nlh = __nlmsg_put(skb, 0, 0, type, (len - sizeof(*nlh)), 0);
2566         memcpy(nlmsg_data(nlh), payload, size);
2567         return iscsi_unicast_skb(skb, portid);
2568 }
2569
2570 static int
2571 iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
2572 {
2573         struct iscsi_uevent *ev = nlmsg_data(nlh);
2574         struct iscsi_stats *stats;
2575         struct sk_buff *skbstat;
2576         struct iscsi_cls_conn *conn;
2577         struct nlmsghdr *nlhstat;
2578         struct iscsi_uevent *evstat;
2579         struct iscsi_internal *priv;
2580         int len = nlmsg_total_size(sizeof(*ev) +
2581                                    sizeof(struct iscsi_stats) +
2582                                    sizeof(struct iscsi_stats_custom) *
2583                                    ISCSI_STATS_CUSTOM_MAX);
2584         int err = 0;
2585
2586         priv = iscsi_if_transport_lookup(transport);
2587         if (!priv)
2588                 return -EINVAL;
2589
2590         conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid);
2591         if (!conn)
2592                 return -EEXIST;
2593
2594         do {
2595                 int actual_size;
2596
2597                 skbstat = alloc_skb(len, GFP_ATOMIC);
2598                 if (!skbstat) {
2599                         iscsi_cls_conn_printk(KERN_ERR, conn, "can not "
2600                                               "deliver stats: OOM\n");
2601                         return -ENOMEM;
2602                 }
2603
2604                 nlhstat = __nlmsg_put(skbstat, 0, 0, 0,
2605                                       (len - sizeof(*nlhstat)), 0);
2606                 evstat = nlmsg_data(nlhstat);
2607                 memset(evstat, 0, sizeof(*evstat));
2608                 evstat->transport_handle = iscsi_handle(conn->transport);
2609                 evstat->type = nlh->nlmsg_type;
2610                 evstat->u.get_stats.cid =
2611                         ev->u.get_stats.cid;
2612                 evstat->u.get_stats.sid =
2613                         ev->u.get_stats.sid;
2614                 stats = (struct iscsi_stats *)
2615                         ((char*)evstat + sizeof(*evstat));
2616                 memset(stats, 0, sizeof(*stats));
2617
2618                 transport->get_stats(conn, stats);
2619                 actual_size = nlmsg_total_size(sizeof(struct iscsi_uevent) +
2620                                                sizeof(struct iscsi_stats) +
2621                                                sizeof(struct iscsi_stats_custom) *
2622                                                stats->custom_length);
2623                 actual_size -= sizeof(*nlhstat);
2624                 actual_size = nlmsg_msg_size(actual_size);
2625                 skb_trim(skbstat, NLMSG_ALIGN(actual_size));
2626                 nlhstat->nlmsg_len = actual_size;
2627
2628                 err = iscsi_multicast_skb(skbstat, ISCSI_NL_GRP_ISCSID,
2629                                           GFP_ATOMIC);
2630         } while (err < 0 && err != -ECONNREFUSED);
2631
2632         return err;
2633 }
2634
2635 /**
2636  * iscsi_session_event - send session destr. completion event
2637  * @session: iscsi class session
2638  * @event: type of event
2639  */
2640 int iscsi_session_event(struct iscsi_cls_session *session,
2641                         enum iscsi_uevent_e event)
2642 {
2643         struct iscsi_internal *priv;
2644         struct Scsi_Host *shost;
2645         struct iscsi_uevent *ev;
2646         struct sk_buff  *skb;
2647         struct nlmsghdr *nlh;
2648         int rc, len = nlmsg_total_size(sizeof(*ev));
2649
2650         priv = iscsi_if_transport_lookup(session->transport);
2651         if (!priv)
2652                 return -EINVAL;
2653         shost = iscsi_session_to_shost(session);
2654
2655         skb = alloc_skb(len, GFP_KERNEL);
2656         if (!skb) {
2657                 iscsi_cls_session_printk(KERN_ERR, session,
2658                                          "Cannot notify userspace of session "
2659                                          "event %u\n", event);
2660                 return -ENOMEM;
2661         }
2662
2663         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2664         ev = nlmsg_data(nlh);
2665         ev->transport_handle = iscsi_handle(session->transport);
2666
2667         ev->type = event;
2668         switch (event) {
2669         case ISCSI_KEVENT_DESTROY_SESSION:
2670                 ev->r.d_session.host_no = shost->host_no;
2671                 ev->r.d_session.sid = session->sid;
2672                 break;
2673         case ISCSI_KEVENT_CREATE_SESSION:
2674                 ev->r.c_session_ret.host_no = shost->host_no;
2675                 ev->r.c_session_ret.sid = session->sid;
2676                 break;
2677         case ISCSI_KEVENT_UNBIND_SESSION:
2678                 ev->r.unbind_session.host_no = shost->host_no;
2679                 ev->r.unbind_session.sid = session->sid;
2680                 break;
2681         default:
2682                 iscsi_cls_session_printk(KERN_ERR, session, "Invalid event "
2683                                          "%u.\n", event);
2684                 kfree_skb(skb);
2685                 return -EINVAL;
2686         }
2687
2688         /*
2689          * this will occur if the daemon is not up, so we just warn
2690          * the user and when the daemon is restarted it will handle it
2691          */
2692         rc = iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_KERNEL);
2693         if (rc == -ESRCH)
2694                 iscsi_cls_session_printk(KERN_ERR, session,
2695                                          "Cannot notify userspace of session "
2696                                          "event %u. Check iscsi daemon\n",
2697                                          event);
2698
2699         ISCSI_DBG_TRANS_SESSION(session, "Completed handling event %d rc %d\n",
2700                                 event, rc);
2701         return rc;
2702 }
2703 EXPORT_SYMBOL_GPL(iscsi_session_event);
2704
2705 static int
2706 iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_endpoint *ep,
2707                         struct iscsi_uevent *ev, pid_t pid,
2708                         uint32_t initial_cmdsn, uint16_t cmds_max,
2709                         uint16_t queue_depth)
2710 {
2711         struct iscsi_transport *transport = priv->iscsi_transport;
2712         struct iscsi_cls_session *session;
2713         struct Scsi_Host *shost;
2714
2715         session = transport->create_session(ep, cmds_max, queue_depth,
2716                                             initial_cmdsn);
2717         if (!session)
2718                 return -ENOMEM;
2719
2720         session->creator = pid;
2721         shost = iscsi_session_to_shost(session);
2722         ev->r.c_session_ret.host_no = shost->host_no;
2723         ev->r.c_session_ret.sid = session->sid;
2724         ISCSI_DBG_TRANS_SESSION(session,
2725                                 "Completed creating transport session\n");
2726         return 0;
2727 }
2728
2729 static int
2730 iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2731 {
2732         struct iscsi_cls_conn *conn;
2733         struct iscsi_cls_session *session;
2734
2735         session = iscsi_session_lookup(ev->u.c_conn.sid);
2736         if (!session) {
2737                 printk(KERN_ERR "iscsi: invalid session %d.\n",
2738                        ev->u.c_conn.sid);
2739                 return -EINVAL;
2740         }
2741
2742         conn = transport->create_conn(session, ev->u.c_conn.cid);
2743         if (!conn) {
2744                 iscsi_cls_session_printk(KERN_ERR, session,
2745                                          "couldn't create a new connection.");
2746                 return -ENOMEM;
2747         }
2748
2749         ev->r.c_conn_ret.sid = session->sid;
2750         ev->r.c_conn_ret.cid = conn->cid;
2751
2752         ISCSI_DBG_TRANS_CONN(conn, "Completed creating transport conn\n");
2753         return 0;
2754 }
2755
2756 static int
2757 iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2758 {
2759         struct iscsi_cls_conn *conn;
2760
2761         conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid);
2762         if (!conn)
2763                 return -EINVAL;
2764
2765         ISCSI_DBG_TRANS_CONN(conn, "Destroying transport conn\n");
2766         if (transport->destroy_conn)
2767                 transport->destroy_conn(conn);
2768
2769         return 0;
2770 }
2771
2772 static int
2773 iscsi_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2774 {
2775         char *data = (char*)ev + sizeof(*ev);
2776         struct iscsi_cls_conn *conn;
2777         struct iscsi_cls_session *session;
2778         int err = 0, value = 0;
2779
2780         session = iscsi_session_lookup(ev->u.set_param.sid);
2781         conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid);
2782         if (!conn || !session)
2783                 return -EINVAL;
2784
2785         switch (ev->u.set_param.param) {
2786         case ISCSI_PARAM_SESS_RECOVERY_TMO:
2787                 sscanf(data, "%d", &value);
2788                 if (!session->recovery_tmo_sysfs_override)
2789                         session->recovery_tmo = value;
2790                 break;
2791         default:
2792                 err = transport->set_param(conn, ev->u.set_param.param,
2793                                            data, ev->u.set_param.len);
2794         }
2795
2796         return err;
2797 }
2798
2799 static int iscsi_if_ep_connect(struct iscsi_transport *transport,
2800                                struct iscsi_uevent *ev, int msg_type)
2801 {
2802         struct iscsi_endpoint *ep;
2803         struct sockaddr *dst_addr;
2804         struct Scsi_Host *shost = NULL;
2805         int non_blocking, err = 0;
2806
2807         if (!transport->ep_connect)
2808                 return -EINVAL;
2809
2810         if (msg_type == ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST) {
2811                 shost = scsi_host_lookup(ev->u.ep_connect_through_host.host_no);
2812                 if (!shost) {
2813                         printk(KERN_ERR "ep connect failed. Could not find "
2814                                "host no %u\n",
2815                                ev->u.ep_connect_through_host.host_no);
2816                         return -ENODEV;
2817                 }
2818                 non_blocking = ev->u.ep_connect_through_host.non_blocking;
2819         } else
2820                 non_blocking = ev->u.ep_connect.non_blocking;
2821
2822         dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
2823         ep = transport->ep_connect(shost, dst_addr, non_blocking);
2824         if (IS_ERR(ep)) {
2825                 err = PTR_ERR(ep);
2826                 goto release_host;
2827         }
2828
2829         ev->r.ep_connect_ret.handle = ep->id;
2830 release_host:
2831         if (shost)
2832                 scsi_host_put(shost);
2833         return err;
2834 }
2835
2836 static int iscsi_if_ep_disconnect(struct iscsi_transport *transport,
2837                                   u64 ep_handle)
2838 {
2839         struct iscsi_cls_conn *conn;
2840         struct iscsi_endpoint *ep;
2841
2842         if (!transport->ep_disconnect)
2843                 return -EINVAL;
2844
2845         ep = iscsi_lookup_endpoint(ep_handle);
2846         if (!ep)
2847                 return -EINVAL;
2848         conn = ep->conn;
2849         if (conn) {
2850                 mutex_lock(&conn->ep_mutex);
2851                 conn->ep = NULL;
2852                 mutex_unlock(&conn->ep_mutex);
2853         }
2854
2855         transport->ep_disconnect(ep);
2856         return 0;
2857 }
2858
2859 static int
2860 iscsi_if_transport_ep(struct iscsi_transport *transport,
2861                       struct iscsi_uevent *ev, int msg_type)
2862 {
2863         struct iscsi_endpoint *ep;
2864         int rc = 0;
2865
2866         switch (msg_type) {
2867         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
2868         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
2869                 rc = iscsi_if_ep_connect(transport, ev, msg_type);
2870                 break;
2871         case ISCSI_UEVENT_TRANSPORT_EP_POLL:
2872                 if (!transport->ep_poll)
2873                         return -EINVAL;
2874
2875                 ep = iscsi_lookup_endpoint(ev->u.ep_poll.ep_handle);
2876                 if (!ep)
2877                         return -EINVAL;
2878
2879                 ev->r.retcode = transport->ep_poll(ep,
2880                                                    ev->u.ep_poll.timeout_ms);
2881                 break;
2882         case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
2883                 rc = iscsi_if_ep_disconnect(transport,
2884                                             ev->u.ep_disconnect.ep_handle);
2885                 break;
2886         }
2887         return rc;
2888 }
2889
2890 static int
2891 iscsi_tgt_dscvr(struct iscsi_transport *transport,
2892                 struct iscsi_uevent *ev)
2893 {
2894         struct Scsi_Host *shost;
2895         struct sockaddr *dst_addr;
2896         int err;
2897
2898         if (!transport->tgt_dscvr)
2899                 return -EINVAL;
2900
2901         shost = scsi_host_lookup(ev->u.tgt_dscvr.host_no);
2902         if (!shost) {
2903                 printk(KERN_ERR "target discovery could not find host no %u\n",
2904                        ev->u.tgt_dscvr.host_no);
2905                 return -ENODEV;
2906         }
2907
2908
2909         dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
2910         err = transport->tgt_dscvr(shost, ev->u.tgt_dscvr.type,
2911                                    ev->u.tgt_dscvr.enable, dst_addr);
2912         scsi_host_put(shost);
2913         return err;
2914 }
2915
2916 static int
2917 iscsi_set_host_param(struct iscsi_transport *transport,
2918                      struct iscsi_uevent *ev)
2919 {
2920         char *data = (char*)ev + sizeof(*ev);
2921         struct Scsi_Host *shost;
2922         int err;
2923
2924         if (!transport->set_host_param)
2925                 return -ENOSYS;
2926
2927         shost = scsi_host_lookup(ev->u.set_host_param.host_no);
2928         if (!shost) {
2929                 printk(KERN_ERR "set_host_param could not find host no %u\n",
2930                        ev->u.set_host_param.host_no);
2931                 return -ENODEV;
2932         }
2933
2934         err = transport->set_host_param(shost, ev->u.set_host_param.param,
2935                                         data, ev->u.set_host_param.len);
2936         scsi_host_put(shost);
2937         return err;
2938 }
2939
2940 static int
2941 iscsi_set_path(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2942 {
2943         struct Scsi_Host *shost;
2944         struct iscsi_path *params;
2945         int err;
2946
2947         if (!transport->set_path)
2948                 return -ENOSYS;
2949
2950         shost = scsi_host_lookup(ev->u.set_path.host_no);
2951         if (!shost) {
2952                 printk(KERN_ERR "set path could not find host no %u\n",
2953                        ev->u.set_path.host_no);
2954                 return -ENODEV;
2955         }
2956
2957         params = (struct iscsi_path *)((char *)ev + sizeof(*ev));
2958         err = transport->set_path(shost, params);
2959
2960         scsi_host_put(shost);
2961         return err;
2962 }
2963
2964 static int iscsi_session_has_conns(int sid)
2965 {
2966         struct iscsi_cls_conn *conn;
2967         unsigned long flags;
2968         int found = 0;
2969
2970         spin_lock_irqsave(&connlock, flags);
2971         list_for_each_entry(conn, &connlist, conn_list) {
2972                 if (iscsi_conn_get_sid(conn) == sid) {
2973                         found = 1;
2974                         break;
2975                 }
2976         }
2977         spin_unlock_irqrestore(&connlock, flags);
2978
2979         return found;
2980 }
2981
2982 static int
2983 iscsi_set_iface_params(struct iscsi_transport *transport,
2984                        struct iscsi_uevent *ev, uint32_t len)
2985 {
2986         char *data = (char *)ev + sizeof(*ev);
2987         struct Scsi_Host *shost;
2988         int err;
2989
2990         if (!transport->set_iface_param)
2991                 return -ENOSYS;
2992
2993         shost = scsi_host_lookup(ev->u.set_iface_params.host_no);
2994         if (!shost) {
2995                 printk(KERN_ERR "set_iface_params could not find host no %u\n",
2996                        ev->u.set_iface_params.host_no);
2997                 return -ENODEV;
2998         }
2999
3000         err = transport->set_iface_param(shost, data, len);
3001         scsi_host_put(shost);
3002         return err;
3003 }
3004
3005 static int
3006 iscsi_send_ping(struct iscsi_transport *transport, struct iscsi_uevent *ev)
3007 {
3008         struct Scsi_Host *shost;
3009         struct sockaddr *dst_addr;
3010         int err;
3011
3012         if (!transport->send_ping)
3013                 return -ENOSYS;
3014
3015         shost = scsi_host_lookup(ev->u.iscsi_ping.host_no);
3016         if (!shost) {
3017                 printk(KERN_ERR "iscsi_ping could not find host no %u\n",
3018                        ev->u.iscsi_ping.host_no);
3019                 return -ENODEV;
3020         }
3021
3022         dst_addr = (struct sockaddr *)((char *)ev + sizeof(*ev));
3023         err = transport->send_ping(shost, ev->u.iscsi_ping.iface_num,
3024                                    ev->u.iscsi_ping.iface_type,
3025                                    ev->u.iscsi_ping.payload_size,
3026                                    ev->u.iscsi_ping.pid,
3027                                    dst_addr);
3028         scsi_host_put(shost);
3029         return err;
3030 }
3031
3032 static int
3033 iscsi_get_chap(struct iscsi_transport *transport, struct nlmsghdr *nlh)
3034 {
3035         struct iscsi_uevent *ev = nlmsg_data(nlh);
3036         struct Scsi_Host *shost = NULL;
3037         struct iscsi_chap_rec *chap_rec;
3038         struct iscsi_internal *priv;
3039         struct sk_buff *skbchap;
3040         struct nlmsghdr *nlhchap;
3041         struct iscsi_uevent *evchap;
3042         uint32_t chap_buf_size;
3043         int len, err = 0;
3044         char *buf;
3045
3046         if (!transport->get_chap)
3047                 return -EINVAL;
3048
3049         priv = iscsi_if_transport_lookup(transport);
3050         if (!priv)
3051                 return -EINVAL;
3052
3053         chap_buf_size = (ev->u.get_chap.num_entries * sizeof(*chap_rec));
3054         len = nlmsg_total_size(sizeof(*ev) + chap_buf_size);
3055
3056         shost = scsi_host_lookup(ev->u.get_chap.host_no);
3057         if (!shost) {
3058                 printk(KERN_ERR "%s: failed. Could not find host no %u\n",
3059                        __func__, ev->u.get_chap.host_no);
3060                 return -ENODEV;
3061         }
3062
3063         do {
3064                 int actual_size;
3065
3066                 skbchap = alloc_skb(len, GFP_KERNEL);
3067                 if (!skbchap) {
3068                         printk(KERN_ERR "can not deliver chap: OOM\n");
3069                         err = -ENOMEM;
3070                         goto exit_get_chap;
3071                 }
3072
3073                 nlhchap = __nlmsg_put(skbchap, 0, 0, 0,
3074                                       (len - sizeof(*nlhchap)), 0);
3075                 evchap = nlmsg_data(nlhchap);
3076                 memset(evchap, 0, sizeof(*evchap));
3077                 evchap->transport_handle = iscsi_handle(transport);
3078                 evchap->type = nlh->nlmsg_type;
3079                 evchap->u.get_chap.host_no = ev->u.get_chap.host_no;
3080                 evchap->u.get_chap.chap_tbl_idx = ev->u.get_chap.chap_tbl_idx;
3081                 evchap->u.get_chap.num_entries = ev->u.get_chap.num_entries;
3082                 buf = (char *)evchap + sizeof(*evchap);
3083                 memset(buf, 0, chap_buf_size);
3084
3085                 err = transport->get_chap(shost, ev->u.get_chap.chap_tbl_idx,
3086                                     &evchap->u.get_chap.num_entries, buf);
3087
3088                 actual_size = nlmsg_total_size(sizeof(*ev) + chap_buf_size);
3089                 skb_trim(skbchap, NLMSG_ALIGN(actual_size));
3090                 nlhchap->nlmsg_len = actual_size;
3091
3092                 err = iscsi_multicast_skb(skbchap, ISCSI_NL_GRP_ISCSID,
3093                                           GFP_KERNEL);
3094         } while (err < 0 && err != -ECONNREFUSED);
3095
3096 exit_get_chap:
3097         scsi_host_put(shost);
3098         return err;
3099 }
3100
3101 static int iscsi_set_chap(struct iscsi_transport *transport,
3102                           struct iscsi_uevent *ev, uint32_t len)
3103 {
3104         char *data = (char *)ev + sizeof(*ev);
3105         struct Scsi_Host *shost;
3106         int err = 0;
3107
3108         if (!transport->set_chap)
3109                 return -ENOSYS;
3110
3111         shost = scsi_host_lookup(ev->u.set_path.host_no);
3112         if (!shost) {
3113                 pr_err("%s could not find host no %u\n",
3114                        __func__, ev->u.set_path.host_no);
3115                 return -ENODEV;
3116         }
3117
3118         err = transport->set_chap(shost, data, len);
3119         scsi_host_put(shost);
3120         return err;
3121 }
3122
3123 static int iscsi_delete_chap(struct iscsi_transport *transport,
3124                              struct iscsi_uevent *ev)
3125 {
3126         struct Scsi_Host *shost;
3127         int err = 0;
3128
3129         if (!transport->delete_chap)
3130                 return -ENOSYS;
3131
3132         shost = scsi_host_lookup(ev->u.delete_chap.host_no);
3133         if (!shost) {
3134                 printk(KERN_ERR "%s could not find host no %u\n",
3135                        __func__, ev->u.delete_chap.host_no);
3136                 return -ENODEV;
3137         }
3138
3139         err = transport->delete_chap(shost, ev->u.delete_chap.chap_tbl_idx);
3140         scsi_host_put(shost);
3141         return err;
3142 }
3143
3144 static const struct {
3145         enum iscsi_discovery_parent_type value;
3146         char                            *name;
3147 } iscsi_discovery_parent_names[] = {
3148         {ISCSI_DISC_PARENT_UNKNOWN,     "Unknown" },
3149         {ISCSI_DISC_PARENT_SENDTGT,     "Sendtarget" },
3150         {ISCSI_DISC_PARENT_ISNS,        "isns" },
3151 };
3152
3153 char *iscsi_get_discovery_parent_name(int parent_type)
3154 {
3155         int i;
3156         char *state = "Unknown!";
3157
3158         for (i = 0; i < ARRAY_SIZE(iscsi_discovery_parent_names); i++) {
3159                 if (iscsi_discovery_parent_names[i].value & parent_type) {
3160                         state = iscsi_discovery_parent_names[i].name;
3161                         break;
3162                 }
3163         }
3164         return state;
3165 }
3166 EXPORT_SYMBOL_GPL(iscsi_get_discovery_parent_name);
3167
3168 static int iscsi_set_flashnode_param(struct iscsi_transport *transport,
3169                                      struct iscsi_uevent *ev, uint32_t len)
3170 {
3171         char *data = (char *)ev + sizeof(*ev);
3172         struct Scsi_Host *shost;
3173         struct iscsi_bus_flash_session *fnode_sess;
3174         struct iscsi_bus_flash_conn *fnode_conn;
3175         struct device *dev;
3176         uint32_t idx;
3177         int err = 0;
3178
3179         if (!transport->set_flashnode_param) {
3180                 err = -ENOSYS;
3181                 goto exit_set_fnode;
3182         }
3183
3184         shost = scsi_host_lookup(ev->u.set_flashnode.host_no);
3185         if (!shost) {
3186                 pr_err("%s could not find host no %u\n",
3187                        __func__, ev->u.set_flashnode.host_no);
3188                 err = -ENODEV;
3189                 goto put_host;
3190         }
3191
3192         idx = ev->u.set_flashnode.flashnode_idx;
3193         fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3194         if (!fnode_sess) {
3195                 pr_err("%s could not find flashnode %u for host no %u\n",
3196                        __func__, idx, ev->u.set_flashnode.host_no);
3197                 err = -ENODEV;
3198                 goto put_host;
3199         }
3200
3201         dev = iscsi_find_flashnode_conn(fnode_sess);
3202         if (!dev) {
3203                 err = -ENODEV;
3204                 goto put_sess;
3205         }
3206
3207         fnode_conn = iscsi_dev_to_flash_conn(dev);
3208         err = transport->set_flashnode_param(fnode_sess, fnode_conn, data, len);
3209         put_device(dev);
3210
3211 put_sess:
3212         put_device(&fnode_sess->dev);
3213
3214 put_host:
3215         scsi_host_put(shost);
3216
3217 exit_set_fnode:
3218         return err;
3219 }
3220
3221 static int iscsi_new_flashnode(struct iscsi_transport *transport,
3222                                struct iscsi_uevent *ev, uint32_t len)
3223 {
3224         char *data = (char *)ev + sizeof(*ev);
3225         struct Scsi_Host *shost;
3226         int index;
3227         int err = 0;
3228
3229         if (!transport->new_flashnode) {
3230                 err = -ENOSYS;
3231                 goto exit_new_fnode;
3232         }
3233
3234         shost = scsi_host_lookup(ev->u.new_flashnode.host_no);
3235         if (!shost) {
3236                 pr_err("%s could not find host no %u\n",
3237                        __func__, ev->u.new_flashnode.host_no);
3238                 err = -ENODEV;
3239                 goto put_host;
3240         }
3241
3242         index = transport->new_flashnode(shost, data, len);
3243
3244         if (index >= 0)
3245                 ev->r.new_flashnode_ret.flashnode_idx = index;
3246         else
3247                 err = -EIO;
3248
3249 put_host:
3250         scsi_host_put(shost);
3251
3252 exit_new_fnode:
3253         return err;
3254 }
3255
3256 static int iscsi_del_flashnode(struct iscsi_transport *transport,
3257                                struct iscsi_uevent *ev)
3258 {
3259         struct Scsi_Host *shost;
3260         struct iscsi_bus_flash_session *fnode_sess;
3261         uint32_t idx;
3262         int err = 0;
3263
3264         if (!transport->del_flashnode) {
3265                 err = -ENOSYS;
3266                 goto exit_del_fnode;
3267         }
3268
3269         shost = scsi_host_lookup(ev->u.del_flashnode.host_no);
3270         if (!shost) {
3271                 pr_err("%s could not find host no %u\n",
3272                        __func__, ev->u.del_flashnode.host_no);
3273                 err = -ENODEV;
3274                 goto put_host;
3275         }
3276
3277         idx = ev->u.del_flashnode.flashnode_idx;
3278         fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3279         if (!fnode_sess) {
3280                 pr_err("%s could not find flashnode %u for host no %u\n",
3281                        __func__, idx, ev->u.del_flashnode.host_no);
3282                 err = -ENODEV;
3283                 goto put_host;
3284         }
3285
3286         err = transport->del_flashnode(fnode_sess);
3287         put_device(&fnode_sess->dev);
3288
3289 put_host:
3290         scsi_host_put(shost);
3291
3292 exit_del_fnode:
3293         return err;
3294 }
3295
3296 static int iscsi_login_flashnode(struct iscsi_transport *transport,
3297                                  struct iscsi_uevent *ev)
3298 {
3299         struct Scsi_Host *shost;
3300         struct iscsi_bus_flash_session *fnode_sess;
3301         struct iscsi_bus_flash_conn *fnode_conn;
3302         struct device *dev;
3303         uint32_t idx;
3304         int err = 0;
3305
3306         if (!transport->login_flashnode) {
3307                 err = -ENOSYS;
3308                 goto exit_login_fnode;
3309         }
3310
3311         shost = scsi_host_lookup(ev->u.login_flashnode.host_no);
3312         if (!shost) {
3313                 pr_err("%s could not find host no %u\n",
3314                        __func__, ev->u.login_flashnode.host_no);
3315                 err = -ENODEV;
3316                 goto put_host;
3317         }
3318
3319         idx = ev->u.login_flashnode.flashnode_idx;
3320         fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3321         if (!fnode_sess) {
3322                 pr_err("%s could not find flashnode %u for host no %u\n",
3323                        __func__, idx, ev->u.login_flashnode.host_no);
3324                 err = -ENODEV;
3325                 goto put_host;
3326         }
3327
3328         dev = iscsi_find_flashnode_conn(fnode_sess);
3329         if (!dev) {
3330                 err = -ENODEV;
3331                 goto put_sess;
3332         }
3333
3334         fnode_conn = iscsi_dev_to_flash_conn(dev);
3335         err = transport->login_flashnode(fnode_sess, fnode_conn);
3336         put_device(dev);
3337
3338 put_sess:
3339         put_device(&fnode_sess->dev);
3340
3341 put_host:
3342         scsi_host_put(shost);
3343
3344 exit_login_fnode:
3345         return err;
3346 }
3347
3348 static int iscsi_logout_flashnode(struct iscsi_transport *transport,
3349                                   struct iscsi_uevent *ev)
3350 {
3351         struct Scsi_Host *shost;
3352         struct iscsi_bus_flash_session *fnode_sess;
3353         struct iscsi_bus_flash_conn *fnode_conn;
3354         struct device *dev;
3355         uint32_t idx;
3356         int err = 0;
3357
3358         if (!transport->logout_flashnode) {
3359                 err = -ENOSYS;
3360                 goto exit_logout_fnode;
3361         }
3362
3363         shost = scsi_host_lookup(ev->u.logout_flashnode.host_no);
3364         if (!shost) {
3365                 pr_err("%s could not find host no %u\n",
3366                        __func__, ev->u.logout_flashnode.host_no);
3367                 err = -ENODEV;
3368                 goto put_host;
3369         }
3370
3371         idx = ev->u.logout_flashnode.flashnode_idx;
3372         fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3373         if (!fnode_sess) {
3374                 pr_err("%s could not find flashnode %u for host no %u\n",
3375                        __func__, idx, ev->u.logout_flashnode.host_no);
3376                 err = -ENODEV;
3377                 goto put_host;
3378         }
3379
3380         dev = iscsi_find_flashnode_conn(fnode_sess);
3381         if (!dev) {
3382                 err = -ENODEV;
3383                 goto put_sess;
3384         }
3385
3386         fnode_conn = iscsi_dev_to_flash_conn(dev);
3387
3388         err = transport->logout_flashnode(fnode_sess, fnode_conn);
3389         put_device(dev);
3390
3391 put_sess:
3392         put_device(&fnode_sess->dev);
3393
3394 put_host:
3395         scsi_host_put(shost);
3396
3397 exit_logout_fnode:
3398         return err;
3399 }
3400
3401 static int iscsi_logout_flashnode_sid(struct iscsi_transport *transport,
3402                                       struct iscsi_uevent *ev)
3403 {
3404         struct Scsi_Host *shost;
3405         struct iscsi_cls_session *session;
3406         int err = 0;
3407
3408         if (!transport->logout_flashnode_sid) {
3409                 err = -ENOSYS;
3410                 goto exit_logout_sid;
3411         }
3412
3413         shost = scsi_host_lookup(ev->u.logout_flashnode_sid.host_no);
3414         if (!shost) {
3415                 pr_err("%s could not find host no %u\n",
3416                        __func__, ev->u.logout_flashnode.host_no);
3417                 err = -ENODEV;
3418                 goto put_host;
3419         }
3420
3421         session = iscsi_session_lookup(ev->u.logout_flashnode_sid.sid);
3422         if (!session) {
3423                 pr_err("%s could not find session id %u\n",
3424                        __func__, ev->u.logout_flashnode_sid.sid);
3425                 err = -EINVAL;
3426                 goto put_host;
3427         }
3428
3429         err = transport->logout_flashnode_sid(session);
3430
3431 put_host:
3432         scsi_host_put(shost);
3433
3434 exit_logout_sid:
3435         return err;
3436 }
3437
3438 static int
3439 iscsi_get_host_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
3440 {
3441         struct iscsi_uevent *ev = nlmsg_data(nlh);
3442         struct Scsi_Host *shost = NULL;
3443         struct iscsi_internal *priv;
3444         struct sk_buff *skbhost_stats;
3445         struct nlmsghdr *nlhhost_stats;
3446         struct iscsi_uevent *evhost_stats;
3447         int host_stats_size = 0;
3448         int len, err = 0;
3449         char *buf;
3450
3451         if (!transport->get_host_stats)
3452                 return -ENOSYS;
3453
3454         priv = iscsi_if_transport_lookup(transport);
3455         if (!priv)
3456                 return -EINVAL;
3457
3458         host_stats_size = sizeof(struct iscsi_offload_host_stats);
3459         len = nlmsg_total_size(sizeof(*ev) + host_stats_size);
3460
3461         shost = scsi_host_lookup(ev->u.get_host_stats.host_no);
3462         if (!shost) {
3463                 pr_err("%s: failed. Could not find host no %u\n",
3464                        __func__, ev->u.get_host_stats.host_no);
3465                 return -ENODEV;
3466         }
3467
3468         do {
3469                 int actual_size;
3470
3471                 skbhost_stats = alloc_skb(len, GFP_KERNEL);
3472                 if (!skbhost_stats) {
3473                         pr_err("cannot deliver host stats: OOM\n");
3474                         err = -ENOMEM;
3475                         goto exit_host_stats;
3476                 }
3477
3478                 nlhhost_stats = __nlmsg_put(skbhost_stats, 0, 0, 0,
3479                                       (len - sizeof(*nlhhost_stats)), 0);
3480                 evhost_stats = nlmsg_data(nlhhost_stats);
3481                 memset(evhost_stats, 0, sizeof(*evhost_stats));
3482                 evhost_stats->transport_handle = iscsi_handle(transport);
3483                 evhost_stats->type = nlh->nlmsg_type;
3484                 evhost_stats->u.get_host_stats.host_no =
3485                                         ev->u.get_host_stats.host_no;
3486                 buf = (char *)evhost_stats + sizeof(*evhost_stats);
3487                 memset(buf, 0, host_stats_size);
3488
3489                 err = transport->get_host_stats(shost, buf, host_stats_size);
3490                 if (err) {
3491                         kfree_skb(skbhost_stats);
3492                         goto exit_host_stats;
3493                 }
3494
3495                 actual_size = nlmsg_total_size(sizeof(*ev) + host_stats_size);
3496                 skb_trim(skbhost_stats, NLMSG_ALIGN(actual_size));
3497                 nlhhost_stats->nlmsg_len = actual_size;
3498
3499                 err = iscsi_multicast_skb(skbhost_stats, ISCSI_NL_GRP_ISCSID,
3500                                           GFP_KERNEL);
3501         } while (err < 0 && err != -ECONNREFUSED);
3502
3503 exit_host_stats:
3504         scsi_host_put(shost);
3505         return err;
3506 }
3507
3508
3509 static int
3510 iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, uint32_t *group)
3511 {
3512         int err = 0;
3513         u32 portid;
3514         struct iscsi_uevent *ev = nlmsg_data(nlh);
3515         struct iscsi_transport *transport = NULL;
3516         struct iscsi_internal *priv;
3517         struct iscsi_cls_session *session;
3518         struct iscsi_cls_conn *conn;
3519         struct iscsi_endpoint *ep = NULL;
3520
3521         if (nlh->nlmsg_type == ISCSI_UEVENT_PATH_UPDATE)
3522                 *group = ISCSI_NL_GRP_UIP;
3523         else
3524                 *group = ISCSI_NL_GRP_ISCSID;
3525
3526         priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle));
3527         if (!priv)
3528                 return -EINVAL;
3529         transport = priv->iscsi_transport;
3530
3531         if (!try_module_get(transport->owner))
3532                 return -EINVAL;
3533
3534         portid = NETLINK_CB(skb).portid;
3535
3536         switch (nlh->nlmsg_type) {
3537         case ISCSI_UEVENT_CREATE_SESSION:
3538                 err = iscsi_if_create_session(priv, ep, ev,
3539                                               portid,
3540                                               ev->u.c_session.initial_cmdsn,
3541                                               ev->u.c_session.cmds_max,
3542                                               ev->u.c_session.queue_depth);
3543                 break;
3544         case ISCSI_UEVENT_CREATE_BOUND_SESSION:
3545                 ep = iscsi_lookup_endpoint(ev->u.c_bound_session.ep_handle);
3546                 if (!ep) {
3547                         err = -EINVAL;
3548                         break;
3549                 }
3550
3551                 err = iscsi_if_create_session(priv, ep, ev,
3552                                         portid,
3553                                         ev->u.c_bound_session.initial_cmdsn,
3554                                         ev->u.c_bound_session.cmds_max,
3555                                         ev->u.c_bound_session.queue_depth);
3556                 break;
3557         case ISCSI_UEVENT_DESTROY_SESSION:
3558                 session = iscsi_session_lookup(ev->u.d_session.sid);
3559                 if (!session)
3560                         err = -EINVAL;
3561                 else if (iscsi_session_has_conns(ev->u.d_session.sid))
3562                         err = -EBUSY;
3563                 else
3564                         transport->destroy_session(session);
3565                 break;
3566         case ISCSI_UEVENT_UNBIND_SESSION:
3567                 session = iscsi_session_lookup(ev->u.d_session.sid);
3568                 if (session)
3569                         scsi_queue_work(iscsi_session_to_shost(session),
3570                                         &session->unbind_work);
3571                 else
3572                         err = -EINVAL;
3573                 break;
3574         case ISCSI_UEVENT_CREATE_CONN:
3575                 err = iscsi_if_create_conn(transport, ev);
3576                 break;
3577         case ISCSI_UEVENT_DESTROY_CONN:
3578                 err = iscsi_if_destroy_conn(transport, ev);
3579                 break;
3580         case ISCSI_UEVENT_BIND_CONN:
3581                 session = iscsi_session_lookup(ev->u.b_conn.sid);
3582                 conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid);
3583
3584                 if (conn && conn->ep)
3585                         iscsi_if_ep_disconnect(transport, conn->ep->id);
3586
3587                 if (!session || !conn) {
3588                         err = -EINVAL;
3589                         break;
3590                 }
3591
3592                 ev->r.retcode = transport->bind_conn(session, conn,
3593                                                 ev->u.b_conn.transport_eph,
3594                                                 ev->u.b_conn.is_leading);
3595                 if (ev->r.retcode || !transport->ep_connect)
3596                         break;
3597
3598                 ep = iscsi_lookup_endpoint(ev->u.b_conn.transport_eph);
3599                 if (ep) {
3600                         ep->conn = conn;
3601
3602                         mutex_lock(&conn->ep_mutex);
3603                         conn->ep = ep;
3604                         mutex_unlock(&conn->ep_mutex);
3605                 } else
3606                         iscsi_cls_conn_printk(KERN_ERR, conn,
3607                                               "Could not set ep conn "
3608                                               "binding\n");
3609                 break;
3610         case ISCSI_UEVENT_SET_PARAM:
3611                 err = iscsi_set_param(transport, ev);
3612                 break;
3613         case ISCSI_UEVENT_START_CONN:
3614                 conn = iscsi_conn_lookup(ev->u.start_conn.sid, ev->u.start_conn.cid);
3615                 if (conn)
3616                         ev->r.retcode = transport->start_conn(conn);
3617                 else
3618                         err = -EINVAL;
3619                 break;
3620         case ISCSI_UEVENT_STOP_CONN:
3621                 conn = iscsi_conn_lookup(ev->u.stop_conn.sid, ev->u.stop_conn.cid);
3622                 if (conn)
3623                         transport->stop_conn(conn, ev->u.stop_conn.flag);
3624                 else
3625                         err = -EINVAL;
3626                 break;
3627         case ISCSI_UEVENT_SEND_PDU:
3628                 conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid);
3629                 if (conn)
3630                         ev->r.retcode = transport->send_pdu(conn,
3631                                 (struct iscsi_hdr*)((char*)ev + sizeof(*ev)),
3632                                 (char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size,
3633                                 ev->u.send_pdu.data_size);
3634                 else
3635                         err = -EINVAL;
3636                 break;
3637         case ISCSI_UEVENT_GET_STATS:
3638                 err = iscsi_if_get_stats(transport, nlh);
3639                 break;
3640         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
3641         case ISCSI_UEVENT_TRANSPORT_EP_POLL:
3642         case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
3643         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
3644                 err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type);
3645                 break;
3646         case ISCSI_UEVENT_TGT_DSCVR:
3647                 err = iscsi_tgt_dscvr(transport, ev);
3648                 break;
3649         case ISCSI_UEVENT_SET_HOST_PARAM:
3650                 err = iscsi_set_host_param(transport, ev);
3651                 break;
3652         case ISCSI_UEVENT_PATH_UPDATE:
3653                 err = iscsi_set_path(transport, ev);
3654                 break;
3655         case ISCSI_UEVENT_SET_IFACE_PARAMS:
3656                 err = iscsi_set_iface_params(transport, ev,
3657                                              nlmsg_attrlen(nlh, sizeof(*ev)));
3658                 break;
3659         case ISCSI_UEVENT_PING:
3660                 err = iscsi_send_ping(transport, ev);
3661                 break;
3662         case ISCSI_UEVENT_GET_CHAP:
3663                 err = iscsi_get_chap(transport, nlh);
3664                 break;
3665         case ISCSI_UEVENT_DELETE_CHAP:
3666                 err = iscsi_delete_chap(transport, ev);
3667                 break;
3668         case ISCSI_UEVENT_SET_FLASHNODE_PARAMS:
3669                 err = iscsi_set_flashnode_param(transport, ev,
3670                                                 nlmsg_attrlen(nlh,
3671                                                               sizeof(*ev)));
3672                 break;
3673         case ISCSI_UEVENT_NEW_FLASHNODE:
3674                 err = iscsi_new_flashnode(transport, ev,
3675                                           nlmsg_attrlen(nlh, sizeof(*ev)));
3676                 break;
3677         case ISCSI_UEVENT_DEL_FLASHNODE:
3678                 err = iscsi_del_flashnode(transport, ev);
3679                 break;
3680         case ISCSI_UEVENT_LOGIN_FLASHNODE:
3681                 err = iscsi_login_flashnode(transport, ev);
3682                 break;
3683         case ISCSI_UEVENT_LOGOUT_FLASHNODE:
3684                 err = iscsi_logout_flashnode(transport, ev);
3685                 break;
3686         case ISCSI_UEVENT_LOGOUT_FLASHNODE_SID:
3687                 err = iscsi_logout_flashnode_sid(transport, ev);
3688                 break;
3689         case ISCSI_UEVENT_SET_CHAP:
3690                 err = iscsi_set_chap(transport, ev,
3691                                      nlmsg_attrlen(nlh, sizeof(*ev)));
3692                 break;
3693         case ISCSI_UEVENT_GET_HOST_STATS:
3694                 err = iscsi_get_host_stats(transport, nlh);
3695                 break;
3696         default:
3697                 err = -ENOSYS;
3698                 break;
3699         }
3700
3701         module_put(transport->owner);
3702         return err;
3703 }
3704
3705 /*
3706  * Get message from skb.  Each message is processed by iscsi_if_recv_msg.
3707  * Malformed skbs with wrong lengths or invalid creds are not processed.
3708  */
3709 static void
3710 iscsi_if_rx(struct sk_buff *skb)
3711 {
3712         u32 portid = NETLINK_CB(skb).portid;
3713
3714         mutex_lock(&rx_queue_mutex);
3715         while (skb->len >= NLMSG_HDRLEN) {
3716                 int err;
3717                 uint32_t rlen;
3718                 struct nlmsghdr *nlh;
3719                 struct iscsi_uevent *ev;
3720                 uint32_t group;
3721                 int retries = ISCSI_SEND_MAX_ALLOWED;
3722
3723                 nlh = nlmsg_hdr(skb);
3724                 if (nlh->nlmsg_len < sizeof(*nlh) + sizeof(*ev) ||
3725                     skb->len < nlh->nlmsg_len) {
3726                         break;
3727                 }
3728
3729                 ev = nlmsg_data(nlh);
3730                 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
3731                 if (rlen > skb->len)
3732                         rlen = skb->len;
3733
3734                 err = iscsi_if_recv_msg(skb, nlh, &group);
3735                 if (err) {
3736                         ev->type = ISCSI_KEVENT_IF_ERROR;
3737                         ev->iferror = err;
3738                 }
3739                 do {
3740                         /*
3741                          * special case for GET_STATS:
3742                          * on success - sending reply and stats from
3743                          * inside of if_recv_msg(),
3744                          * on error - fall through.
3745                          */
3746                         if (ev->type == ISCSI_UEVENT_GET_STATS && !err)
3747                                 break;
3748                         if (ev->type == ISCSI_UEVENT_GET_CHAP && !err)
3749                                 break;
3750                         err = iscsi_if_send_reply(portid, nlh->nlmsg_type,
3751                                                   ev, sizeof(*ev));
3752                         if (err == -EAGAIN && --retries < 0) {
3753                                 printk(KERN_WARNING "Send reply failed, error %d\n", err);
3754                                 break;
3755                         }
3756                 } while (err < 0 && err != -ECONNREFUSED && err != -ESRCH);
3757                 skb_pull(skb, rlen);
3758         }
3759         mutex_unlock(&rx_queue_mutex);
3760 }
3761
3762 #define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store)              \
3763 struct device_attribute dev_attr_##_prefix##_##_name =  \
3764         __ATTR(_name,_mode,_show,_store)
3765
3766 /*
3767  * iSCSI connection attrs
3768  */
3769 #define iscsi_conn_attr_show(param)                                     \
3770 static ssize_t                                                          \
3771 show_conn_param_##param(struct device *dev,                             \
3772                         struct device_attribute *attr, char *buf)       \
3773 {                                                                       \
3774         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);   \
3775         struct iscsi_transport *t = conn->transport;                    \
3776         return t->get_conn_param(conn, param, buf);                     \
3777 }
3778
3779 #define iscsi_conn_attr(field, param)                                   \
3780         iscsi_conn_attr_show(param)                                     \
3781 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param,  \
3782                         NULL);
3783
3784 iscsi_conn_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH);
3785 iscsi_conn_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH);
3786 iscsi_conn_attr(header_digest, ISCSI_PARAM_HDRDGST_EN);
3787 iscsi_conn_attr(data_digest, ISCSI_PARAM_DATADGST_EN);
3788 iscsi_conn_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN);
3789 iscsi_conn_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN);
3790 iscsi_conn_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT);
3791 iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN);
3792 iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS);
3793 iscsi_conn_attr(ping_tmo, ISCSI_PARAM_PING_TMO);
3794 iscsi_conn_attr(recv_tmo, ISCSI_PARAM_RECV_TMO);
3795 iscsi_conn_attr(local_port, ISCSI_PARAM_LOCAL_PORT);
3796 iscsi_conn_attr(statsn, ISCSI_PARAM_STATSN);
3797 iscsi_conn_attr(keepalive_tmo, ISCSI_PARAM_KEEPALIVE_TMO);
3798 iscsi_conn_attr(max_segment_size, ISCSI_PARAM_MAX_SEGMENT_SIZE);
3799 iscsi_conn_attr(tcp_timestamp_stat, ISCSI_PARAM_TCP_TIMESTAMP_STAT);
3800 iscsi_conn_attr(tcp_wsf_disable, ISCSI_PARAM_TCP_WSF_DISABLE);
3801 iscsi_conn_attr(tcp_nagle_disable, ISCSI_PARAM_TCP_NAGLE_DISABLE);
3802 iscsi_conn_attr(tcp_timer_scale, ISCSI_PARAM_TCP_TIMER_SCALE);
3803 iscsi_conn_attr(tcp_timestamp_enable, ISCSI_PARAM_TCP_TIMESTAMP_EN);
3804 iscsi_conn_attr(fragment_disable, ISCSI_PARAM_IP_FRAGMENT_DISABLE);
3805 iscsi_conn_attr(ipv4_tos, ISCSI_PARAM_IPV4_TOS);
3806 iscsi_conn_attr(ipv6_traffic_class, ISCSI_PARAM_IPV6_TC);
3807 iscsi_conn_attr(ipv6_flow_label, ISCSI_PARAM_IPV6_FLOW_LABEL);
3808 iscsi_conn_attr(is_fw_assigned_ipv6, ISCSI_PARAM_IS_FW_ASSIGNED_IPV6);
3809 iscsi_conn_attr(tcp_xmit_wsf, ISCSI_PARAM_TCP_XMIT_WSF);
3810 iscsi_conn_attr(tcp_recv_wsf, ISCSI_PARAM_TCP_RECV_WSF);
3811 iscsi_conn_attr(local_ipaddr, ISCSI_PARAM_LOCAL_IPADDR);
3812
3813
3814 #define iscsi_conn_ep_attr_show(param)                                  \
3815 static ssize_t show_conn_ep_param_##param(struct device *dev,           \
3816                                           struct device_attribute *attr,\
3817                                           char *buf)                    \
3818 {                                                                       \
3819         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);   \
3820         struct iscsi_transport *t = conn->transport;                    \
3821         struct iscsi_endpoint *ep;                                      \
3822         ssize_t rc;                                                     \
3823                                                                         \
3824         /*                                                              \
3825          * Need to make sure ep_disconnect does not free the LLD's      \
3826          * interconnect resources while we are trying to read them.     \
3827          */                                                             \
3828         mutex_lock(&conn->ep_mutex);                                    \
3829         ep = conn->ep;                                                  \
3830         if (!ep && t->ep_connect) {                                     \
3831                 mutex_unlock(&conn->ep_mutex);                          \
3832                 return -ENOTCONN;                                       \
3833         }                                                               \
3834                                                                         \
3835         if (ep)                                                         \
3836                 rc = t->get_ep_param(ep, param, buf);                   \
3837         else                                                            \
3838                 rc = t->get_conn_param(conn, param, buf);               \
3839         mutex_unlock(&conn->ep_mutex);                                  \
3840         return rc;                                                      \
3841 }
3842
3843 #define iscsi_conn_ep_attr(field, param)                                \
3844         iscsi_conn_ep_attr_show(param)                                  \
3845 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO,                           \
3846                         show_conn_ep_param_##param, NULL);
3847
3848 iscsi_conn_ep_attr(address, ISCSI_PARAM_CONN_ADDRESS);
3849 iscsi_conn_ep_attr(port, ISCSI_PARAM_CONN_PORT);
3850
3851 static struct attribute *iscsi_conn_attrs[] = {
3852         &dev_attr_conn_max_recv_dlength.attr,
3853         &dev_attr_conn_max_xmit_dlength.attr,
3854         &dev_attr_conn_header_digest.attr,
3855         &dev_attr_conn_data_digest.attr,
3856         &dev_attr_conn_ifmarker.attr,
3857         &dev_attr_conn_ofmarker.attr,
3858         &dev_attr_conn_address.attr,
3859         &dev_attr_conn_port.attr,
3860         &dev_attr_conn_exp_statsn.attr,
3861         &dev_attr_conn_persistent_address.attr,
3862         &dev_attr_conn_persistent_port.attr,
3863         &dev_attr_conn_ping_tmo.attr,
3864         &dev_attr_conn_recv_tmo.attr,
3865         &dev_attr_conn_local_port.attr,
3866         &dev_attr_conn_statsn.attr,
3867         &dev_attr_conn_keepalive_tmo.attr,
3868         &dev_attr_conn_max_segment_size.attr,
3869         &dev_attr_conn_tcp_timestamp_stat.attr,
3870         &dev_attr_conn_tcp_wsf_disable.attr,
3871         &dev_attr_conn_tcp_nagle_disable.attr,
3872         &dev_attr_conn_tcp_timer_scale.attr,
3873         &dev_attr_conn_tcp_timestamp_enable.attr,
3874         &dev_attr_conn_fragment_disable.attr,
3875         &dev_attr_conn_ipv4_tos.attr,
3876         &dev_attr_conn_ipv6_traffic_class.attr,
3877         &dev_attr_conn_ipv6_flow_label.attr,
3878         &dev_attr_conn_is_fw_assigned_ipv6.attr,
3879         &dev_attr_conn_tcp_xmit_wsf.attr,
3880         &dev_attr_conn_tcp_recv_wsf.attr,
3881         &dev_attr_conn_local_ipaddr.attr,
3882         NULL,
3883 };
3884
3885 static umode_t iscsi_conn_attr_is_visible(struct kobject *kobj,
3886                                          struct attribute *attr, int i)
3887 {
3888         struct device *cdev = container_of(kobj, struct device, kobj);
3889         struct iscsi_cls_conn *conn = transport_class_to_conn(cdev);
3890         struct iscsi_transport *t = conn->transport;
3891         int param;
3892
3893         if (attr == &dev_attr_conn_max_recv_dlength.attr)
3894                 param = ISCSI_PARAM_MAX_RECV_DLENGTH;
3895         else if (attr == &dev_attr_conn_max_xmit_dlength.attr)
3896                 param = ISCSI_PARAM_MAX_XMIT_DLENGTH;
3897         else if (attr == &dev_attr_conn_header_digest.attr)
3898                 param = ISCSI_PARAM_HDRDGST_EN;
3899         else if (attr == &dev_attr_conn_data_digest.attr)
3900                 param = ISCSI_PARAM_DATADGST_EN;
3901         else if (attr == &dev_attr_conn_ifmarker.attr)
3902                 param = ISCSI_PARAM_IFMARKER_EN;
3903         else if (attr == &dev_attr_conn_ofmarker.attr)
3904                 param = ISCSI_PARAM_OFMARKER_EN;
3905         else if (attr == &dev_attr_conn_address.attr)
3906                 param = ISCSI_PARAM_CONN_ADDRESS;
3907         else if (attr == &dev_attr_conn_port.attr)
3908                 param = ISCSI_PARAM_CONN_PORT;
3909         else if (attr == &dev_attr_conn_exp_statsn.attr)
3910                 param = ISCSI_PARAM_EXP_STATSN;
3911         else if (attr == &dev_attr_conn_persistent_address.attr)
3912                 param = ISCSI_PARAM_PERSISTENT_ADDRESS;
3913         else if (attr == &dev_attr_conn_persistent_port.attr)
3914                 param = ISCSI_PARAM_PERSISTENT_PORT;
3915         else if (attr == &dev_attr_conn_ping_tmo.attr)
3916                 param = ISCSI_PARAM_PING_TMO;
3917         else if (attr == &dev_attr_conn_recv_tmo.attr)
3918                 param = ISCSI_PARAM_RECV_TMO;
3919         else if (attr == &dev_attr_conn_local_port.attr)
3920                 param = ISCSI_PARAM_LOCAL_PORT;
3921         else if (attr == &dev_attr_conn_statsn.attr)
3922                 param = ISCSI_PARAM_STATSN;
3923         else if (attr == &dev_attr_conn_keepalive_tmo.attr)
3924                 param = ISCSI_PARAM_KEEPALIVE_TMO;
3925         else if (attr == &dev_attr_conn_max_segment_size.attr)
3926                 param = ISCSI_PARAM_MAX_SEGMENT_SIZE;
3927         else if (attr == &dev_attr_conn_tcp_timestamp_stat.attr)
3928                 param = ISCSI_PARAM_TCP_TIMESTAMP_STAT;
3929         else if (attr == &dev_attr_conn_tcp_wsf_disable.attr)
3930                 param = ISCSI_PARAM_TCP_WSF_DISABLE;
3931         else if (attr == &dev_attr_conn_tcp_nagle_disable.attr)
3932                 param = ISCSI_PARAM_TCP_NAGLE_DISABLE;
3933         else if (attr == &dev_attr_conn_tcp_timer_scale.attr)
3934                 param = ISCSI_PARAM_TCP_TIMER_SCALE;
3935         else if (attr == &dev_attr_conn_tcp_timestamp_enable.attr)
3936                 param = ISCSI_PARAM_TCP_TIMESTAMP_EN;
3937         else if (attr == &dev_attr_conn_fragment_disable.attr)
3938                 param = ISCSI_PARAM_IP_FRAGMENT_DISABLE;
3939         else if (attr == &dev_attr_conn_ipv4_tos.attr)
3940                 param = ISCSI_PARAM_IPV4_TOS;
3941         else if (attr == &dev_attr_conn_ipv6_traffic_class.attr)
3942                 param = ISCSI_PARAM_IPV6_TC;
3943         else if (attr == &dev_attr_conn_ipv6_flow_label.attr)
3944                 param = ISCSI_PARAM_IPV6_FLOW_LABEL;
3945         else if (attr == &dev_attr_conn_is_fw_assigned_ipv6.attr)
3946                 param = ISCSI_PARAM_IS_FW_ASSIGNED_IPV6;
3947         else if (attr == &dev_attr_conn_tcp_xmit_wsf.attr)
3948                 param = ISCSI_PARAM_TCP_XMIT_WSF;
3949         else if (attr == &dev_attr_conn_tcp_recv_wsf.attr)
3950                 param = ISCSI_PARAM_TCP_RECV_WSF;
3951         else if (attr == &dev_attr_conn_local_ipaddr.attr)
3952                 param = ISCSI_PARAM_LOCAL_IPADDR;
3953         else {
3954                 WARN_ONCE(1, "Invalid conn attr");
3955                 return 0;
3956         }
3957
3958         return t->attr_is_visible(ISCSI_PARAM, param);
3959 }
3960
3961 static struct attribute_group iscsi_conn_group = {
3962         .attrs = iscsi_conn_attrs,
3963         .is_visible = iscsi_conn_attr_is_visible,
3964 };
3965
3966 /*
3967  * iSCSI session attrs
3968  */
3969 #define iscsi_session_attr_show(param, perm)                            \
3970 static ssize_t                                                          \
3971 show_session_param_##param(struct device *dev,                          \
3972                            struct device_attribute *attr, char *buf)    \
3973 {                                                                       \
3974         struct iscsi_cls_session *session =                             \
3975                 iscsi_dev_to_session(dev->parent);                      \
3976         struct iscsi_transport *t = session->transport;                 \
3977                                                                         \
3978         if (perm && !capable(CAP_SYS_ADMIN))                            \
3979                 return -EACCES;                                         \
3980         return t->get_session_param(session, param, buf);               \
3981 }
3982
3983 #define iscsi_session_attr(field, param, perm)                          \
3984         iscsi_session_attr_show(param, perm)                            \
3985 static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \
3986                         NULL);
3987 iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME, 0);
3988 iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, 0);
3989 iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, 0);
3990 iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, 0);
3991 iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, 0);
3992 iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, 0);
3993 iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, 0);
3994 iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, 0);
3995 iscsi_session_attr(erl, ISCSI_PARAM_ERL, 0);
3996 iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT, 0);
3997 iscsi_session_attr(username, ISCSI_PARAM_USERNAME, 1);
3998 iscsi_session_attr(username_in, ISCSI_PARAM_USERNAME_IN, 1);
3999 iscsi_session_attr(password, ISCSI_PARAM_PASSWORD, 1);
4000 iscsi_session_attr(password_in, ISCSI_PARAM_PASSWORD_IN, 1);
4001 iscsi_session_attr(chap_out_idx, ISCSI_PARAM_CHAP_OUT_IDX, 1);
4002 iscsi_session_attr(chap_in_idx, ISCSI_PARAM_CHAP_IN_IDX, 1);
4003 iscsi_session_attr(fast_abort, ISCSI_PARAM_FAST_ABORT, 0);
4004 iscsi_session_attr(abort_tmo, ISCSI_PARAM_ABORT_TMO, 0);
4005 iscsi_session_attr(lu_reset_tmo, ISCSI_PARAM_LU_RESET_TMO, 0);
4006 iscsi_session_attr(tgt_reset_tmo, ISCSI_PARAM_TGT_RESET_TMO, 0);
4007 iscsi_session_attr(ifacename, ISCSI_PARAM_IFACE_NAME, 0);
4008 iscsi_session_attr(initiatorname, ISCSI_PARAM_INITIATOR_NAME, 0);
4009 iscsi_session_attr(targetalias, ISCSI_PARAM_TARGET_ALIAS, 0);
4010 iscsi_session_attr(boot_root, ISCSI_PARAM_BOOT_ROOT, 0);
4011 iscsi_session_attr(boot_nic, ISCSI_PARAM_BOOT_NIC, 0);
4012 iscsi_session_attr(boot_target, ISCSI_PARAM_BOOT_TARGET, 0);
4013 iscsi_session_attr(auto_snd_tgt_disable, ISCSI_PARAM_AUTO_SND_TGT_DISABLE, 0);
4014 iscsi_session_attr(discovery_session, ISCSI_PARAM_DISCOVERY_SESS, 0);
4015 iscsi_session_attr(portal_type, ISCSI_PARAM_PORTAL_TYPE, 0);
4016 iscsi_session_attr(chap_auth, ISCSI_PARAM_CHAP_AUTH_EN, 0);
4017 iscsi_session_attr(discovery_logout, ISCSI_PARAM_DISCOVERY_LOGOUT_EN, 0);
4018 iscsi_session_attr(bidi_chap, ISCSI_PARAM_BIDI_CHAP_EN, 0);
4019 iscsi_session_attr(discovery_auth_optional,
4020                    ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL, 0);
4021 iscsi_session_attr(def_time2wait, ISCSI_PARAM_DEF_TIME2WAIT, 0);
4022 iscsi_session_attr(def_time2retain, ISCSI_PARAM_DEF_TIME2RETAIN, 0);
4023 iscsi_session_attr(isid, ISCSI_PARAM_ISID, 0);
4024 iscsi_session_attr(tsid, ISCSI_PARAM_TSID, 0);
4025 iscsi_session_attr(def_taskmgmt_tmo, ISCSI_PARAM_DEF_TASKMGMT_TMO, 0);
4026 iscsi_session_attr(discovery_parent_idx, ISCSI_PARAM_DISCOVERY_PARENT_IDX, 0);
4027 iscsi_session_attr(discovery_parent_type, ISCSI_PARAM_DISCOVERY_PARENT_TYPE, 0);
4028
4029 static ssize_t
4030 show_priv_session_state(struct device *dev, struct device_attribute *attr,
4031                         char *buf)
4032 {
4033         struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4034         return sprintf(buf, "%s\n", iscsi_session_state_name(session->state));
4035 }
4036 static ISCSI_CLASS_ATTR(priv_sess, state, S_IRUGO, show_priv_session_state,
4037                         NULL);
4038 static ssize_t
4039 show_priv_session_creator(struct device *dev, struct device_attribute *attr,
4040                         char *buf)
4041 {
4042         struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4043         return sprintf(buf, "%d\n", session->creator);
4044 }
4045 static ISCSI_CLASS_ATTR(priv_sess, creator, S_IRUGO, show_priv_session_creator,
4046                         NULL);
4047 static ssize_t
4048 show_priv_session_target_id(struct device *dev, struct device_attribute *attr,
4049                             char *buf)
4050 {
4051         struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4052         return sprintf(buf, "%d\n", session->target_id);
4053 }
4054 static ISCSI_CLASS_ATTR(priv_sess, target_id, S_IRUGO,
4055                         show_priv_session_target_id, NULL);
4056
4057 #define iscsi_priv_session_attr_show(field, format)                     \
4058 static ssize_t                                                          \
4059 show_priv_session_##field(struct device *dev,                           \
4060                           struct device_attribute *attr, char *buf)     \
4061 {                                                                       \
4062         struct iscsi_cls_session *session =                             \
4063                         iscsi_dev_to_session(dev->parent);              \
4064         if (session->field == -1)                                       \
4065                 return sprintf(buf, "off\n");                           \
4066         return sprintf(buf, format"\n", session->field);                \
4067 }
4068
4069 #define iscsi_priv_session_attr_store(field)                            \
4070 static ssize_t                                                          \
4071 store_priv_session_##field(struct device *dev,                          \
4072                            struct device_attribute *attr,               \
4073                            const char *buf, size_t count)               \
4074 {                                                                       \
4075         int val;                                                        \
4076         char *cp;                                                       \
4077         struct iscsi_cls_session *session =                             \
4078                 iscsi_dev_to_session(dev->parent);                      \
4079         if ((session->state == ISCSI_SESSION_FREE) ||                   \
4080             (session->state == ISCSI_SESSION_FAILED))                   \
4081                 return -EBUSY;                                          \
4082         if (strncmp(buf, "off", 3) == 0) {                              \
4083                 session->field = -1;                                    \
4084                 session->field##_sysfs_override = true;                 \
4085         } else {                                                        \
4086                 val = simple_strtoul(buf, &cp, 0);                      \
4087                 if (*cp != '\0' && *cp != '\n')                         \
4088                         return -EINVAL;                                 \
4089                 session->field = val;                                   \
4090                 session->field##_sysfs_override = true;                 \
4091         }                                                               \
4092         return count;                                                   \
4093 }
4094
4095 #define iscsi_priv_session_rw_attr(field, format)                       \
4096         iscsi_priv_session_attr_show(field, format)                     \
4097         iscsi_priv_session_attr_store(field)                            \
4098 static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO | S_IWUSR,            \
4099                         show_priv_session_##field,                      \
4100                         store_priv_session_##field)
4101
4102 iscsi_priv_session_rw_attr(recovery_tmo, "%d");
4103
4104 static struct attribute *iscsi_session_attrs[] = {
4105         &dev_attr_sess_initial_r2t.attr,
4106         &dev_attr_sess_max_outstanding_r2t.attr,
4107         &dev_attr_sess_immediate_data.attr,
4108         &dev_attr_sess_first_burst_len.attr,
4109         &dev_attr_sess_max_burst_len.attr,
4110         &dev_attr_sess_data_pdu_in_order.attr,
4111         &dev_attr_sess_data_seq_in_order.attr,
4112         &dev_attr_sess_erl.attr,
4113         &dev_attr_sess_targetname.attr,
4114         &dev_attr_sess_tpgt.attr,
4115         &dev_attr_sess_password.attr,
4116         &dev_attr_sess_password_in.attr,
4117         &dev_attr_sess_username.attr,
4118         &dev_attr_sess_username_in.attr,
4119         &dev_attr_sess_fast_abort.attr,
4120         &dev_attr_sess_abort_tmo.attr,
4121         &dev_attr_sess_lu_reset_tmo.attr,
4122         &dev_attr_sess_tgt_reset_tmo.attr,
4123         &dev_attr_sess_ifacename.attr,
4124         &dev_attr_sess_initiatorname.attr,
4125         &dev_attr_sess_targetalias.attr,
4126         &dev_attr_sess_boot_root.attr,
4127         &dev_attr_sess_boot_nic.attr,
4128         &dev_attr_sess_boot_target.attr,
4129         &dev_attr_priv_sess_recovery_tmo.attr,
4130         &dev_attr_priv_sess_state.attr,
4131         &dev_attr_priv_sess_creator.attr,
4132         &dev_attr_sess_chap_out_idx.attr,
4133         &dev_attr_sess_chap_in_idx.attr,
4134         &dev_attr_priv_sess_target_id.attr,
4135         &dev_attr_sess_auto_snd_tgt_disable.attr,
4136         &dev_attr_sess_discovery_session.attr,
4137         &dev_attr_sess_portal_type.attr,
4138         &dev_attr_sess_chap_auth.attr,
4139         &dev_attr_sess_discovery_logout.attr,
4140         &dev_attr_sess_bidi_chap.attr,
4141         &dev_attr_sess_discovery_auth_optional.attr,
4142         &dev_attr_sess_def_time2wait.attr,
4143         &dev_attr_sess_def_time2retain.attr,
4144         &dev_attr_sess_isid.attr,
4145         &dev_attr_sess_tsid.attr,
4146         &dev_attr_sess_def_taskmgmt_tmo.attr,
4147         &dev_attr_sess_discovery_parent_idx.attr,
4148         &dev_attr_sess_discovery_parent_type.attr,
4149         NULL,
4150 };
4151
4152 static umode_t iscsi_session_attr_is_visible(struct kobject *kobj,
4153                                             struct attribute *attr, int i)
4154 {
4155         struct device *cdev = container_of(kobj, struct device, kobj);
4156         struct iscsi_cls_session *session = transport_class_to_session(cdev);
4157         struct iscsi_transport *t = session->transport;
4158         int param;
4159
4160         if (attr == &dev_attr_sess_initial_r2t.attr)
4161                 param = ISCSI_PARAM_INITIAL_R2T_EN;
4162         else if (attr == &dev_attr_sess_max_outstanding_r2t.attr)
4163                 param = ISCSI_PARAM_MAX_R2T;
4164         else if (attr == &dev_attr_sess_immediate_data.attr)
4165                 param = ISCSI_PARAM_IMM_DATA_EN;
4166         else if (attr == &dev_attr_sess_first_burst_len.attr)
4167                 param = ISCSI_PARAM_FIRST_BURST;
4168         else if (attr == &dev_attr_sess_max_burst_len.attr)
4169                 param = ISCSI_PARAM_MAX_BURST;
4170         else if (attr == &dev_attr_sess_data_pdu_in_order.attr)
4171                 param = ISCSI_PARAM_PDU_INORDER_EN;
4172         else if (attr == &dev_attr_sess_data_seq_in_order.attr)
4173                 param = ISCSI_PARAM_DATASEQ_INORDER_EN;
4174         else if (attr == &dev_attr_sess_erl.attr)
4175                 param = ISCSI_PARAM_ERL;
4176         else if (attr == &dev_attr_sess_targetname.attr)
4177                 param = ISCSI_PARAM_TARGET_NAME;
4178         else if (attr == &dev_attr_sess_tpgt.attr)
4179                 param = ISCSI_PARAM_TPGT;
4180         else if (attr == &dev_attr_sess_chap_in_idx.attr)
4181                 param = ISCSI_PARAM_CHAP_IN_IDX;
4182         else if (attr == &dev_attr_sess_chap_out_idx.attr)
4183                 param = ISCSI_PARAM_CHAP_OUT_IDX;
4184         else if (attr == &dev_attr_sess_password.attr)
4185                 param = ISCSI_PARAM_USERNAME;
4186         else if (attr == &dev_attr_sess_password_in.attr)
4187                 param = ISCSI_PARAM_USERNAME_IN;
4188         else if (attr == &dev_attr_sess_username.attr)
4189                 param = ISCSI_PARAM_PASSWORD;
4190         else if (attr == &dev_attr_sess_username_in.attr)
4191                 param = ISCSI_PARAM_PASSWORD_IN;
4192         else if (attr == &dev_attr_sess_fast_abort.attr)
4193                 param = ISCSI_PARAM_FAST_ABORT;
4194         else if (attr == &dev_attr_sess_abort_tmo.attr)
4195                 param = ISCSI_PARAM_ABORT_TMO;
4196         else if (attr == &dev_attr_sess_lu_reset_tmo.attr)
4197                 param = ISCSI_PARAM_LU_RESET_TMO;
4198         else if (attr == &dev_attr_sess_tgt_reset_tmo.attr)
4199                 param = ISCSI_PARAM_TGT_RESET_TMO;
4200         else if (attr == &dev_attr_sess_ifacename.attr)
4201                 param = ISCSI_PARAM_IFACE_NAME;
4202         else if (attr == &dev_attr_sess_initiatorname.attr)
4203                 param = ISCSI_PARAM_INITIATOR_NAME;
4204         else if (attr == &dev_attr_sess_targetalias.attr)
4205                 param = ISCSI_PARAM_TARGET_ALIAS;
4206         else if (attr == &dev_attr_sess_boot_root.attr)
4207                 param = ISCSI_PARAM_BOOT_ROOT;
4208         else if (attr == &dev_attr_sess_boot_nic.attr)
4209                 param = ISCSI_PARAM_BOOT_NIC;
4210         else if (attr == &dev_attr_sess_boot_target.attr)
4211                 param = ISCSI_PARAM_BOOT_TARGET;
4212         else if (attr == &dev_attr_sess_auto_snd_tgt_disable.attr)
4213                 param = ISCSI_PARAM_AUTO_SND_TGT_DISABLE;
4214         else if (attr == &dev_attr_sess_discovery_session.attr)
4215                 param = ISCSI_PARAM_DISCOVERY_SESS;
4216         else if (attr == &dev_attr_sess_portal_type.attr)
4217                 param = ISCSI_PARAM_PORTAL_TYPE;
4218         else if (attr == &dev_attr_sess_chap_auth.attr)
4219                 param = ISCSI_PARAM_CHAP_AUTH_EN;
4220         else if (attr == &dev_attr_sess_discovery_logout.attr)
4221                 param = ISCSI_PARAM_DISCOVERY_LOGOUT_EN;
4222         else if (attr == &dev_attr_sess_bidi_chap.attr)
4223                 param = ISCSI_PARAM_BIDI_CHAP_EN;
4224         else if (attr == &dev_attr_sess_discovery_auth_optional.attr)
4225                 param = ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL;
4226         else if (attr == &dev_attr_sess_def_time2wait.attr)
4227                 param = ISCSI_PARAM_DEF_TIME2WAIT;
4228         else if (attr == &dev_attr_sess_def_time2retain.attr)
4229                 param = ISCSI_PARAM_DEF_TIME2RETAIN;
4230         else if (attr == &dev_attr_sess_isid.attr)
4231                 param = ISCSI_PARAM_ISID;
4232         else if (attr == &dev_attr_sess_tsid.attr)
4233                 param = ISCSI_PARAM_TSID;
4234         else if (attr == &dev_attr_sess_def_taskmgmt_tmo.attr)
4235                 param = ISCSI_PARAM_DEF_TASKMGMT_TMO;
4236         else if (attr == &dev_attr_sess_discovery_parent_idx.attr)
4237                 param = ISCSI_PARAM_DISCOVERY_PARENT_IDX;
4238         else if (attr == &dev_attr_sess_discovery_parent_type.attr)
4239                 param = ISCSI_PARAM_DISCOVERY_PARENT_TYPE;
4240         else if (attr == &dev_attr_priv_sess_recovery_tmo.attr)
4241                 return S_IRUGO | S_IWUSR;
4242         else if (attr == &dev_attr_priv_sess_state.attr)
4243                 return S_IRUGO;
4244         else if (attr == &dev_attr_priv_sess_creator.attr)
4245                 return S_IRUGO;
4246         else if (attr == &dev_attr_priv_sess_target_id.attr)
4247                 return S_IRUGO;
4248         else {
4249                 WARN_ONCE(1, "Invalid session attr");
4250                 return 0;
4251         }
4252
4253         return t->attr_is_visible(ISCSI_PARAM, param);
4254 }
4255
4256 static struct attribute_group iscsi_session_group = {
4257         .attrs = iscsi_session_attrs,
4258         .is_visible = iscsi_session_attr_is_visible,
4259 };
4260
4261 /*
4262  * iSCSI host attrs
4263  */
4264 #define iscsi_host_attr_show(param)                                     \
4265 static ssize_t                                                          \
4266 show_host_param_##param(struct device *dev,                             \
4267                         struct device_attribute *attr, char *buf)       \
4268 {                                                                       \
4269         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
4270         struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \
4271         return priv->iscsi_transport->get_host_param(shost, param, buf); \
4272 }
4273
4274 #define iscsi_host_attr(field, param)                                   \
4275         iscsi_host_attr_show(param)                                     \
4276 static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param,  \
4277                         NULL);
4278
4279 iscsi_host_attr(netdev, ISCSI_HOST_PARAM_NETDEV_NAME);
4280 iscsi_host_attr(hwaddress, ISCSI_HOST_PARAM_HWADDRESS);
4281 iscsi_host_attr(ipaddress, ISCSI_HOST_PARAM_IPADDRESS);
4282 iscsi_host_attr(initiatorname, ISCSI_HOST_PARAM_INITIATOR_NAME);
4283 iscsi_host_attr(port_state, ISCSI_HOST_PARAM_PORT_STATE);
4284 iscsi_host_attr(port_speed, ISCSI_HOST_PARAM_PORT_SPEED);
4285
4286 static struct attribute *iscsi_host_attrs[] = {
4287         &dev_attr_host_netdev.attr,
4288         &dev_attr_host_hwaddress.attr,
4289         &dev_attr_host_ipaddress.attr,
4290         &dev_attr_host_initiatorname.attr,
4291         &dev_attr_host_port_state.attr,
4292         &dev_attr_host_port_speed.attr,
4293         NULL,
4294 };
4295
4296 static umode_t iscsi_host_attr_is_visible(struct kobject *kobj,
4297                                          struct attribute *attr, int i)
4298 {
4299         struct device *cdev = container_of(kobj, struct device, kobj);
4300         struct Scsi_Host *shost = transport_class_to_shost(cdev);
4301         struct iscsi_internal *priv = to_iscsi_internal(shost->transportt);
4302         int param;
4303
4304         if (attr == &dev_attr_host_netdev.attr)
4305                 param = ISCSI_HOST_PARAM_NETDEV_NAME;
4306         else if (attr == &dev_attr_host_hwaddress.attr)
4307                 param = ISCSI_HOST_PARAM_HWADDRESS;
4308         else if (attr == &dev_attr_host_ipaddress.attr)
4309                 param = ISCSI_HOST_PARAM_IPADDRESS;
4310         else if (attr == &dev_attr_host_initiatorname.attr)
4311                 param = ISCSI_HOST_PARAM_INITIATOR_NAME;
4312         else if (attr == &dev_attr_host_port_state.attr)
4313                 param = ISCSI_HOST_PARAM_PORT_STATE;
4314         else if (attr == &dev_attr_host_port_speed.attr)
4315                 param = ISCSI_HOST_PARAM_PORT_SPEED;
4316         else {
4317                 WARN_ONCE(1, "Invalid host attr");
4318                 return 0;
4319         }
4320
4321         return priv->iscsi_transport->attr_is_visible(ISCSI_HOST_PARAM, param);
4322 }
4323
4324 static struct attribute_group iscsi_host_group = {
4325         .attrs = iscsi_host_attrs,
4326         .is_visible = iscsi_host_attr_is_visible,
4327 };
4328
4329 /* convert iscsi_port_speed values to ascii string name */
4330 static const struct {
4331         enum iscsi_port_speed   value;
4332         char                    *name;
4333 } iscsi_port_speed_names[] = {
4334         {ISCSI_PORT_SPEED_UNKNOWN,      "Unknown" },
4335         {ISCSI_PORT_SPEED_10MBPS,       "10 Mbps" },
4336         {ISCSI_PORT_SPEED_100MBPS,      "100 Mbps" },
4337         {ISCSI_PORT_SPEED_1GBPS,        "1 Gbps" },
4338         {ISCSI_PORT_SPEED_10GBPS,       "10 Gbps" },
4339         {ISCSI_PORT_SPEED_25GBPS,       "25 Gbps" },
4340         {ISCSI_PORT_SPEED_40GBPS,       "40 Gbps" },
4341 };
4342
4343 char *iscsi_get_port_speed_name(struct Scsi_Host *shost)
4344 {
4345         int i;
4346         char *speed = "Unknown!";
4347         struct iscsi_cls_host *ihost = shost->shost_data;
4348         uint32_t port_speed = ihost->port_speed;
4349
4350         for (i = 0; i < ARRAY_SIZE(iscsi_port_speed_names); i++) {
4351                 if (iscsi_port_speed_names[i].value & port_speed) {
4352                         speed = iscsi_port_speed_names[i].name;
4353                         break;
4354                 }
4355         }
4356         return speed;
4357 }
4358 EXPORT_SYMBOL_GPL(iscsi_get_port_speed_name);
4359
4360 /* convert iscsi_port_state values to ascii string name */
4361 static const struct {
4362         enum iscsi_port_state   value;
4363         char                    *name;
4364 } iscsi_port_state_names[] = {
4365         {ISCSI_PORT_STATE_DOWN,         "LINK DOWN" },
4366         {ISCSI_PORT_STATE_UP,           "LINK UP" },
4367 };
4368
4369 char *iscsi_get_port_state_name(struct Scsi_Host *shost)
4370 {
4371         int i;
4372         char *state = "Unknown!";
4373         struct iscsi_cls_host *ihost = shost->shost_data;
4374         uint32_t port_state = ihost->port_state;
4375
4376         for (i = 0; i < ARRAY_SIZE(iscsi_port_state_names); i++) {
4377                 if (iscsi_port_state_names[i].value & port_state) {
4378                         state = iscsi_port_state_names[i].name;
4379                         break;
4380                 }
4381         }
4382         return state;
4383 }
4384 EXPORT_SYMBOL_GPL(iscsi_get_port_state_name);
4385
4386 static int iscsi_session_match(struct attribute_container *cont,
4387                            struct device *dev)
4388 {
4389         struct iscsi_cls_session *session;
4390         struct Scsi_Host *shost;
4391         struct iscsi_internal *priv;
4392
4393         if (!iscsi_is_session_dev(dev))
4394                 return 0;
4395
4396         session = iscsi_dev_to_session(dev);
4397         shost = iscsi_session_to_shost(session);
4398         if (!shost->transportt)
4399                 return 0;
4400
4401         priv = to_iscsi_internal(shost->transportt);
4402         if (priv->session_cont.ac.class != &iscsi_session_class.class)
4403                 return 0;
4404
4405         return &priv->session_cont.ac == cont;
4406 }
4407
4408 static int iscsi_conn_match(struct attribute_container *cont,
4409                            struct device *dev)
4410 {
4411         struct iscsi_cls_session *session;
4412         struct iscsi_cls_conn *conn;
4413         struct Scsi_Host *shost;
4414         struct iscsi_internal *priv;
4415
4416         if (!iscsi_is_conn_dev(dev))
4417                 return 0;
4418
4419         conn = iscsi_dev_to_conn(dev);
4420         session = iscsi_dev_to_session(conn->dev.parent);
4421         shost = iscsi_session_to_shost(session);
4422
4423         if (!shost->transportt)
4424                 return 0;
4425
4426         priv = to_iscsi_internal(shost->transportt);
4427         if (priv->conn_cont.ac.class != &iscsi_connection_class.class)
4428                 return 0;
4429
4430         return &priv->conn_cont.ac == cont;
4431 }
4432
4433 static int iscsi_host_match(struct attribute_container *cont,
4434                             struct device *dev)
4435 {
4436         struct Scsi_Host *shost;
4437         struct iscsi_internal *priv;
4438
4439         if (!scsi_is_host_device(dev))
4440                 return 0;
4441
4442         shost = dev_to_shost(dev);
4443         if (!shost->transportt  ||
4444             shost->transportt->host_attrs.ac.class != &iscsi_host_class.class)
4445                 return 0;
4446
4447         priv = to_iscsi_internal(shost->transportt);
4448         return &priv->t.host_attrs.ac == cont;
4449 }
4450
4451 struct scsi_transport_template *
4452 iscsi_register_transport(struct iscsi_transport *tt)
4453 {
4454         struct iscsi_internal *priv;
4455         unsigned long flags;
4456         int err;
4457
4458         BUG_ON(!tt);
4459
4460         priv = iscsi_if_transport_lookup(tt);
4461         if (priv)
4462                 return NULL;
4463
4464         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
4465         if (!priv)
4466                 return NULL;
4467         INIT_LIST_HEAD(&priv->list);
4468         priv->iscsi_transport = tt;
4469         priv->t.user_scan = iscsi_user_scan;
4470         priv->t.create_work_queue = 1;
4471
4472         priv->dev.class = &iscsi_transport_class;
4473         dev_set_name(&priv->dev, "%s", tt->name);
4474         err = device_register(&priv->dev);
4475         if (err)
4476                 goto free_priv;
4477
4478         err = sysfs_create_group(&priv->dev.kobj, &iscsi_transport_group);
4479         if (err)
4480                 goto unregister_dev;
4481
4482         /* host parameters */
4483         priv->t.host_attrs.ac.class = &iscsi_host_class.class;
4484         priv->t.host_attrs.ac.match = iscsi_host_match;
4485         priv->t.host_attrs.ac.grp = &iscsi_host_group;
4486         priv->t.host_size = sizeof(struct iscsi_cls_host);
4487         transport_container_register(&priv->t.host_attrs);
4488
4489         /* connection parameters */
4490         priv->conn_cont.ac.class = &iscsi_connection_class.class;
4491         priv->conn_cont.ac.match = iscsi_conn_match;
4492         priv->conn_cont.ac.grp = &iscsi_conn_group;
4493         transport_container_register(&priv->conn_cont);
4494
4495         /* session parameters */
4496         priv->session_cont.ac.class = &iscsi_session_class.class;
4497         priv->session_cont.ac.match = iscsi_session_match;
4498         priv->session_cont.ac.grp = &iscsi_session_group;
4499         transport_container_register(&priv->session_cont);
4500
4501         spin_lock_irqsave(&iscsi_transport_lock, flags);
4502         list_add(&priv->list, &iscsi_transports);
4503         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
4504
4505         printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name);
4506         return &priv->t;
4507
4508 unregister_dev:
4509         device_unregister(&priv->dev);
4510         return NULL;
4511 free_priv:
4512         kfree(priv);
4513         return NULL;
4514 }
4515 EXPORT_SYMBOL_GPL(iscsi_register_transport);
4516
4517 int iscsi_unregister_transport(struct iscsi_transport *tt)
4518 {
4519         struct iscsi_internal *priv;
4520         unsigned long flags;
4521
4522         BUG_ON(!tt);
4523
4524         mutex_lock(&rx_queue_mutex);
4525
4526         priv = iscsi_if_transport_lookup(tt);
4527         BUG_ON (!priv);
4528
4529         spin_lock_irqsave(&iscsi_transport_lock, flags);
4530         list_del(&priv->list);
4531         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
4532
4533         transport_container_unregister(&priv->conn_cont);
4534         transport_container_unregister(&priv->session_cont);
4535         transport_container_unregister(&priv->t.host_attrs);
4536
4537         sysfs_remove_group(&priv->dev.kobj, &iscsi_transport_group);
4538         device_unregister(&priv->dev);
4539         mutex_unlock(&rx_queue_mutex);
4540
4541         return 0;
4542 }
4543 EXPORT_SYMBOL_GPL(iscsi_unregister_transport);
4544
4545 void iscsi_dbg_trace(void (*trace)(struct device *dev, struct va_format *),
4546                      struct device *dev, const char *fmt, ...)
4547 {
4548         struct va_format vaf;
4549         va_list args;
4550
4551         va_start(args, fmt);
4552         vaf.fmt = fmt;
4553         vaf.va = &args;
4554         trace(dev, &vaf);
4555         va_end(args);
4556 }
4557 EXPORT_SYMBOL_GPL(iscsi_dbg_trace);
4558
4559 static __init int iscsi_transport_init(void)
4560 {
4561         int err;
4562         struct netlink_kernel_cfg cfg = {
4563                 .groups = 1,
4564                 .input  = iscsi_if_rx,
4565         };
4566         printk(KERN_INFO "Loading iSCSI transport class v%s.\n",
4567                 ISCSI_TRANSPORT_VERSION);
4568
4569         atomic_set(&iscsi_session_nr, 0);
4570
4571         err = class_register(&iscsi_transport_class);
4572         if (err)
4573                 return err;
4574
4575         err = class_register(&iscsi_endpoint_class);
4576         if (err)
4577                 goto unregister_transport_class;
4578
4579         err = class_register(&iscsi_iface_class);
4580         if (err)
4581                 goto unregister_endpoint_class;
4582
4583         err = transport_class_register(&iscsi_host_class);
4584         if (err)
4585                 goto unregister_iface_class;
4586
4587         err = transport_class_register(&iscsi_connection_class);
4588         if (err)
4589                 goto unregister_host_class;
4590
4591         err = transport_class_register(&iscsi_session_class);
4592         if (err)
4593                 goto unregister_conn_class;
4594
4595         err = bus_register(&iscsi_flashnode_bus);
4596         if (err)
4597                 goto unregister_session_class;
4598
4599         nls = netlink_kernel_create(&init_net, NETLINK_ISCSI, &cfg);
4600         if (!nls) {
4601                 err = -ENOBUFS;
4602                 goto unregister_flashnode_bus;
4603         }
4604
4605         iscsi_eh_timer_workq = create_singlethread_workqueue("iscsi_eh");
4606         if (!iscsi_eh_timer_workq) {
4607                 err = -ENOMEM;
4608                 goto release_nls;
4609         }
4610
4611         return 0;
4612
4613 release_nls:
4614         netlink_kernel_release(nls);
4615 unregister_flashnode_bus:
4616         bus_unregister(&iscsi_flashnode_bus);
4617 unregister_session_class:
4618         transport_class_unregister(&iscsi_session_class);
4619 unregister_conn_class:
4620         transport_class_unregister(&iscsi_connection_class);
4621 unregister_host_class:
4622         transport_class_unregister(&iscsi_host_class);
4623 unregister_iface_class:
4624         class_unregister(&iscsi_iface_class);
4625 unregister_endpoint_class:
4626         class_unregister(&iscsi_endpoint_class);
4627 unregister_transport_class:
4628         class_unregister(&iscsi_transport_class);
4629         return err;
4630 }
4631
4632 static void __exit iscsi_transport_exit(void)
4633 {
4634         destroy_workqueue(iscsi_eh_timer_workq);
4635         netlink_kernel_release(nls);
4636         bus_unregister(&iscsi_flashnode_bus);
4637         transport_class_unregister(&iscsi_connection_class);
4638         transport_class_unregister(&iscsi_session_class);
4639         transport_class_unregister(&iscsi_host_class);
4640         class_unregister(&iscsi_endpoint_class);
4641         class_unregister(&iscsi_iface_class);
4642         class_unregister(&iscsi_transport_class);
4643 }
4644
4645 module_init(iscsi_transport_init);
4646 module_exit(iscsi_transport_exit);
4647
4648 MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
4649               "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
4650               "Alex Aizman <itn780@yahoo.com>");
4651 MODULE_DESCRIPTION("iSCSI Transport Interface");
4652 MODULE_LICENSE("GPL");
4653 MODULE_VERSION(ISCSI_TRANSPORT_VERSION);
4654 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_ISCSI);