drivers/scsi/cxgbi/libcxgbi.c

   1 /*
   2  * libcxgbi.c: Chelsio common library for T3/T4 iSCSI driver.
   3  *
   4  * Copyright (c) 2010 Chelsio Communications, Inc.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation.
   9  *
  10  * Written by: Karen Xie (kxie@chelsio.com)
  11  * Written by: Rakesh Ranjan (rranjan@chelsio.com)
  12  */
  13
  14 #define pr_fmt(fmt)     KBUILD_MODNAME ":%s: " fmt, __func__
  15
  16 #include <linux/skbuff.h>
  17 #include <linux/crypto.h>
  18 #include <linux/scatterlist.h>
  19 #include <linux/pci.h>
  20 #include <scsi/scsi.h>
  21 #include <scsi/scsi_cmnd.h>
  22 #include <scsi/scsi_host.h>
  23 #include <linux/if_vlan.h>
  24 #include <linux/inet.h>
  25 #include <net/dst.h>
  26 #include <net/route.h>
  27 #include <linux/inetdevice.h>   /* ip_dev_find */
  28 #include <net/tcp.h>
  29
  30 static unsigned int dbg_level;
  31
  32 #include "libcxgbi.h"
  33
  34 #define DRV_MODULE_NAME         "libcxgbi"
  35 #define DRV_MODULE_DESC         "Chelsio iSCSI driver library"
  36 #define DRV_MODULE_VERSION      "0.9.0"
  37 #define DRV_MODULE_RELDATE      "Jun. 2010"
  38
  39 MODULE_AUTHOR("Chelsio Communications, Inc.");
  40 MODULE_DESCRIPTION(DRV_MODULE_DESC);
  41 MODULE_VERSION(DRV_MODULE_VERSION);
  42 MODULE_LICENSE("GPL");
  43
  44 module_param(dbg_level, uint, 0644);
  45 MODULE_PARM_DESC(dbg_level, "libiscsi debug level (default=0)");
  46
  47
  48 /*
  49  * cxgbi device management
  50  * maintains a list of the cxgbi devices
  51  */
  52 static LIST_HEAD(cdev_list);
  53 static DEFINE_MUTEX(cdev_mutex);
  54
  55 int cxgbi_device_portmap_create(struct cxgbi_device *cdev, unsigned int base,
  56                                 unsigned int max_conn)
  57 {
  58         struct cxgbi_ports_map *pmap = &cdev->pmap;
  59
  60         pmap->port_csk = cxgbi_alloc_big_mem(max_conn *
  61                                              sizeof(struct cxgbi_sock *),
  62                                              GFP_KERNEL);
  63         if (!pmap->port_csk) {
  64                 pr_warn("cdev 0x%p, portmap OOM %u.\n", cdev, max_conn);
  65                 return -ENOMEM;
  66         }
  67
  68         pmap->max_connect = max_conn;
  69         pmap->sport_base = base;
  70         spin_lock_init(&pmap->lock);
  71         return 0;
  72 }
  73 EXPORT_SYMBOL_GPL(cxgbi_device_portmap_create);
  74
  75 void cxgbi_device_portmap_cleanup(struct cxgbi_device *cdev)
  76 {
  77         struct cxgbi_ports_map *pmap = &cdev->pmap;
  78         struct cxgbi_sock *csk;
  79         int i;
  80
  81         for (i = 0; i < pmap->max_connect; i++) {
  82                 if (pmap->port_csk[i]) {
  83                         csk = pmap->port_csk[i];
  84                         pmap->port_csk[i] = NULL;
  85                         log_debug(1 << CXGBI_DBG_SOCK,
  86                                 "csk 0x%p, cdev 0x%p, offload down.\n",
  87                                 csk, cdev);
  88                         spin_lock_bh(&csk->lock);
  89                         cxgbi_sock_set_flag(csk, CTPF_OFFLOAD_DOWN);
  90                         cxgbi_sock_closed(csk);
  91                         spin_unlock_bh(&csk->lock);
  92                         cxgbi_sock_put(csk);
  93                 }
  94         }
  95 }
  96 EXPORT_SYMBOL_GPL(cxgbi_device_portmap_cleanup);
  97
  98 static inline void cxgbi_device_destroy(struct cxgbi_device *cdev)
  99 {
 100         log_debug(1 << CXGBI_DBG_DEV,
 101                 "cdev 0x%p, p# %u.\n", cdev, cdev->nports);
 102         cxgbi_hbas_remove(cdev);
 103         cxgbi_device_portmap_cleanup(cdev);
 104         if (cdev->dev_ddp_cleanup)
 105                 cdev->dev_ddp_cleanup(cdev);
 106         else
 107                 cxgbi_ddp_cleanup(cdev);
 108         if (cdev->ddp)
 109                 cxgbi_ddp_cleanup(cdev);
 110         if (cdev->pmap.max_connect)
 111                 cxgbi_free_big_mem(cdev->pmap.port_csk);
 112         kfree(cdev);
 113 }
 114
 115 struct cxgbi_device *cxgbi_device_register(unsigned int extra,
 116                                            unsigned int nports)
 117 {
 118         struct cxgbi_device *cdev;
 119
 120         cdev = kzalloc(sizeof(*cdev) + extra + nports *
 121                         (sizeof(struct cxgbi_hba *) +
 122                          sizeof(struct net_device *)),
 123                         GFP_KERNEL);
 124         if (!cdev) {
 125                 pr_warn("nport %d, OOM.\n", nports);
 126                 return NULL;
 127         }
 128         cdev->ports = (struct net_device **)(cdev + 1);
 129         cdev->hbas = (struct cxgbi_hba **)(((char*)cdev->ports) + nports *
 130                                                 sizeof(struct net_device *));
 131         if (extra)
 132                 cdev->dd_data = ((char *)cdev->hbas) +
 133                                 nports * sizeof(struct cxgbi_hba *);
 134         spin_lock_init(&cdev->pmap.lock);
 135
 136         mutex_lock(&cdev_mutex);
 137         list_add_tail(&cdev->list_head, &cdev_list);
 138         mutex_unlock(&cdev_mutex);
 139
 140         log_debug(1 << CXGBI_DBG_DEV,
 141                 "cdev 0x%p, p# %u.\n", cdev, nports);
 142         return cdev;
 143 }
 144 EXPORT_SYMBOL_GPL(cxgbi_device_register);
 145
 146 void cxgbi_device_unregister(struct cxgbi_device *cdev)
 147 {
 148         log_debug(1 << CXGBI_DBG_DEV,
 149                 "cdev 0x%p, p# %u,%s.\n",
 150                 cdev, cdev->nports, cdev->nports ? cdev->ports[0]->name : "");
 151         mutex_lock(&cdev_mutex);
 152         list_del(&cdev->list_head);
 153         mutex_unlock(&cdev_mutex);
 154         cxgbi_device_destroy(cdev);
 155 }
 156 EXPORT_SYMBOL_GPL(cxgbi_device_unregister);
 157
 158 void cxgbi_device_unregister_all(unsigned int flag)
 159 {
 160         struct cxgbi_device *cdev, *tmp;
 161
 162         mutex_lock(&cdev_mutex);
 163         list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
 164                 if ((cdev->flags & flag) == flag) {
 165                         log_debug(1 << CXGBI_DBG_DEV,
 166                                 "cdev 0x%p, p# %u,%s.\n",
 167                                 cdev, cdev->nports, cdev->nports ?
 168                                  cdev->ports[0]->name : "");
 169                         list_del(&cdev->list_head);
 170                         cxgbi_device_destroy(cdev);
 171                 }
 172         }
 173         mutex_unlock(&cdev_mutex);
 174 }
 175 EXPORT_SYMBOL_GPL(cxgbi_device_unregister_all);
 176
 177 struct cxgbi_device *cxgbi_device_find_by_lldev(void *lldev)
 178 {
 179         struct cxgbi_device *cdev, *tmp;
 180
 181         mutex_lock(&cdev_mutex);
 182         list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
 183                 if (cdev->lldev == lldev) {
 184                         mutex_unlock(&cdev_mutex);
 185                         return cdev;
 186                 }
 187         }
 188         mutex_unlock(&cdev_mutex);
 189         log_debug(1 << CXGBI_DBG_DEV,
 190                 "lldev 0x%p, NO match found.\n", lldev);
 191         return NULL;
 192 }
 193 EXPORT_SYMBOL_GPL(cxgbi_device_find_by_lldev);
 194
 195 static struct cxgbi_device *cxgbi_device_find_by_netdev(struct net_device *ndev,
 196                                                         int *port)
 197 {
 198         struct net_device *vdev = NULL;
 199         struct cxgbi_device *cdev, *tmp;
 200         int i;
 201
 202         if (ndev->priv_flags & IFF_802_1Q_VLAN) {
 203                 vdev = ndev;
 204                 ndev = vlan_dev_real_dev(ndev);
 205                 log_debug(1 << CXGBI_DBG_DEV,
 206                         "vlan dev %s -> %s.\n", vdev->name, ndev->name);
 207         }
 208
 209         mutex_lock(&cdev_mutex);
 210         list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
 211                 for (i = 0; i < cdev->nports; i++) {
 212                         if (ndev == cdev->ports[i]) {
 213                                 cdev->hbas[i]->vdev = vdev;
 214                                 mutex_unlock(&cdev_mutex);
 215                                 if (port)
 216                                         *port = i;
 217                                 return cdev;
 218                         }
 219                 }
 220         }
 221         mutex_unlock(&cdev_mutex);
 222         log_debug(1 << CXGBI_DBG_DEV,
 223                 "ndev 0x%p, %s, NO match found.\n", ndev, ndev->name);
 224         return NULL;
 225 }
 226
 227 void cxgbi_hbas_remove(struct cxgbi_device *cdev)
 228 {
 229         int i;
 230         struct cxgbi_hba *chba;
 231
 232         log_debug(1 << CXGBI_DBG_DEV,
 233                 "cdev 0x%p, p#%u.\n", cdev, cdev->nports);
 234
 235         for (i = 0; i < cdev->nports; i++) {
 236                 chba = cdev->hbas[i];
 237                 if (chba) {
 238                         cdev->hbas[i] = NULL;
 239                         iscsi_host_remove(chba->shost);
 240                         pci_dev_put(cdev->pdev);
 241                         iscsi_host_free(chba->shost);
 242                 }
 243         }
 244 }
 245 EXPORT_SYMBOL_GPL(cxgbi_hbas_remove);
 246
 247 int cxgbi_hbas_add(struct cxgbi_device *cdev, unsigned int max_lun,
 248                 unsigned int max_id, struct scsi_host_template *sht,
 249                 struct scsi_transport_template *stt)
 250 {
 251         struct cxgbi_hba *chba;
 252         struct Scsi_Host *shost;
 253         int i, err;
 254
 255         log_debug(1 << CXGBI_DBG_DEV, "cdev 0x%p, p#%u.\n", cdev, cdev->nports);
 256
 257         for (i = 0; i < cdev->nports; i++) {
 258                 shost = iscsi_host_alloc(sht, sizeof(*chba), 1);
 259                 if (!shost) {
 260                         pr_info("0x%p, p%d, %s, host alloc failed.\n",
 261                                 cdev, i, cdev->ports[i]->name);
 262                         err = -ENOMEM;
 263                         goto err_out;
 264                 }
 265
 266                 shost->transportt = stt;
 267                 shost->max_lun = max_lun;
 268                 shost->max_id = max_id;
 269                 shost->max_channel = 0;
 270                 shost->max_cmd_len = 16;
 271
 272                 chba = iscsi_host_priv(shost);
 273                 chba->cdev = cdev;
 274                 chba->ndev = cdev->ports[i];
 275                 chba->shost = shost;
 276
 277                 log_debug(1 << CXGBI_DBG_DEV,
 278                         "cdev 0x%p, p#%d %s: chba 0x%p.\n",
 279                         cdev, i, cdev->ports[i]->name, chba);
 280
 281                 pci_dev_get(cdev->pdev);
 282                 err = iscsi_host_add(shost, &cdev->pdev->dev);
 283                 if (err) {
 284                         pr_info("cdev 0x%p, p#%d %s, host add failed.\n",
 285                                 cdev, i, cdev->ports[i]->name);
 286                         pci_dev_put(cdev->pdev);
 287                         scsi_host_put(shost);
 288                         goto  err_out;
 289                 }
 290
 291                 cdev->hbas[i] = chba;
 292         }
 293
 294         return 0;
 295
 296 err_out:
 297         cxgbi_hbas_remove(cdev);
 298         return err;
 299 }
 300 EXPORT_SYMBOL_GPL(cxgbi_hbas_add);
 301
 302 /*
 303  * iSCSI offload
 304  *
 305  * - source port management
 306  *   To find a free source port in the port allocation map we use a very simple
 307  *   rotor scheme to look for the next free port.
 308  *
 309  *   If a source port has been specified make sure that it doesn't collide with
 310  *   our normal source port allocation map.  If it's outside the range of our
 311  *   allocation/deallocation scheme just let them use it.
 312  *
 313  *   If the source port is outside our allocation range, the caller is
 314  *   responsible for keeping track of their port usage.
 315  */
 316 static int sock_get_port(struct cxgbi_sock *csk)
 317 {
 318         struct cxgbi_device *cdev = csk->cdev;
 319         struct cxgbi_ports_map *pmap = &cdev->pmap;
 320         unsigned int start;
 321         int idx;
 322
 323         if (!pmap->max_connect) {
 324                 pr_err("cdev 0x%p, p#%u %s, NO port map.\n",
 325                            cdev, csk->port_id, cdev->ports[csk->port_id]->name);
 326                 return -EADDRNOTAVAIL;
 327         }
 328
 329         if (csk->saddr.sin_port) {
 330                 pr_err("source port NON-ZERO %u.\n",
 331                         ntohs(csk->saddr.sin_port));
 332                 return -EADDRINUSE;
 333         }
 334
 335         spin_lock_bh(&pmap->lock);
 336         if (pmap->used >= pmap->max_connect) {
 337                 spin_unlock_bh(&pmap->lock);
 338                 pr_info("cdev 0x%p, p#%u %s, ALL ports used.\n",
 339                         cdev, csk->port_id, cdev->ports[csk->port_id]->name);
 340                 return -EADDRNOTAVAIL;
 341         }
 342
 343         start = idx = pmap->next;
 344         do {
 345                 if (++idx >= pmap->max_connect)
 346                         idx = 0;
 347                 if (!pmap->port_csk[idx]) {
 348                         pmap->used++;
 349                         csk->saddr.sin_port =
 350                                 htons(pmap->sport_base + idx);
 351                         pmap->next = idx;
 352                         pmap->port_csk[idx] = csk;
 353                         spin_unlock_bh(&pmap->lock);
 354                         cxgbi_sock_get(csk);
 355                         log_debug(1 << CXGBI_DBG_SOCK,
 356                                 "cdev 0x%p, p#%u %s, p %u, %u.\n",
 357                                 cdev, csk->port_id,
 358                                 cdev->ports[csk->port_id]->name,
 359                                 pmap->sport_base + idx, pmap->next);
 360                         return 0;
 361                 }
 362         } while (idx != start);
 363         spin_unlock_bh(&pmap->lock);
 364
 365         /* should not happen */
 366         pr_warn("cdev 0x%p, p#%u %s, next %u?\n",
 367                 cdev, csk->port_id, cdev->ports[csk->port_id]->name,
 368                 pmap->next);
 369         return -EADDRNOTAVAIL;
 370 }
 371
 372 static void sock_put_port(struct cxgbi_sock *csk)
 373 {
 374         struct cxgbi_device *cdev = csk->cdev;
 375         struct cxgbi_ports_map *pmap = &cdev->pmap;
 376
 377         if (csk->saddr.sin_port) {
 378                 int idx = ntohs(csk->saddr.sin_port) - pmap->sport_base;
 379
 380                 csk->saddr.sin_port = 0;
 381                 if (idx < 0 || idx >= pmap->max_connect) {
 382                         pr_err("cdev 0x%p, p#%u %s, port %u OOR.\n",
 383                                 cdev, csk->port_id,
 384                                 cdev->ports[csk->port_id]->name,
 385                                 ntohs(csk->saddr.sin_port));
 386                         return;
 387                 }
 388
 389                 spin_lock_bh(&pmap->lock);
 390                 pmap->port_csk[idx] = NULL;
 391                 pmap->used--;
 392                 spin_unlock_bh(&pmap->lock);
 393
 394                 log_debug(1 << CXGBI_DBG_SOCK,
 395                         "cdev 0x%p, p#%u %s, release %u.\n",
 396                         cdev, csk->port_id, cdev->ports[csk->port_id]->name,
 397                         pmap->sport_base + idx);
 398
 399                 cxgbi_sock_put(csk);
 400         }
 401 }
 402
 403 /*
 404  * iscsi tcp connection
 405  */
 406 void cxgbi_sock_free_cpl_skbs(struct cxgbi_sock *csk)
 407 {
 408         if (csk->cpl_close) {
 409                 kfree_skb(csk->cpl_close);
 410                 csk->cpl_close = NULL;
 411         }
 412         if (csk->cpl_abort_req) {
 413                 kfree_skb(csk->cpl_abort_req);
 414                 csk->cpl_abort_req = NULL;
 415         }
 416         if (csk->cpl_abort_rpl) {
 417                 kfree_skb(csk->cpl_abort_rpl);
 418                 csk->cpl_abort_rpl = NULL;
 419         }
 420 }
 421 EXPORT_SYMBOL_GPL(cxgbi_sock_free_cpl_skbs);
 422
 423 static struct cxgbi_sock *cxgbi_sock_create(struct cxgbi_device *cdev)
 424 {
 425         struct cxgbi_sock *csk = kzalloc(sizeof(*csk), GFP_NOIO);
 426
 427         if (!csk) {
 428                 pr_info("alloc csk %zu failed.\n", sizeof(*csk));
 429                 return NULL;
 430         }
 431
 432         if (cdev->csk_alloc_cpls(csk) < 0) {
 433                 pr_info("csk 0x%p, alloc cpls failed.\n", csk);
 434                 kfree(csk);
 435                 return NULL;
 436         }
 437
 438         spin_lock_init(&csk->lock);
 439         kref_init(&csk->refcnt);
 440         skb_queue_head_init(&csk->receive_queue);
 441         skb_queue_head_init(&csk->write_queue);
 442         setup_timer(&csk->retry_timer, NULL, (unsigned long)csk);
 443         rwlock_init(&csk->callback_lock);
 444         csk->cdev = cdev;
 445         csk->flags = 0;
 446         cxgbi_sock_set_state(csk, CTP_CLOSED);
 447
 448         log_debug(1 << CXGBI_DBG_SOCK, "cdev 0x%p, new csk 0x%p.\n", cdev, csk);
 449
 450         return csk;
 451 }
 452
 453 static struct rtable *find_route_ipv4(__be32 saddr, __be32 daddr,
 454                                       __be16 sport, __be16 dport, u8 tos)
 455 {
 456         struct rtable *rt;
 457
 458         rt = ip_route_output_ports(&init_net, NULL, daddr, saddr,
 459                                    dport, sport, IPPROTO_TCP, tos, 0);
 460         if (IS_ERR(rt))
 461                 return NULL;
 462
 463         return rt;
 464 }
 465
 466 static struct cxgbi_sock *cxgbi_check_route(struct sockaddr *dst_addr)
 467 {
 468         struct sockaddr_in *daddr = (struct sockaddr_in *)dst_addr;
 469         struct dst_entry *dst;
 470         struct net_device *ndev;
 471         struct cxgbi_device *cdev;
 472         struct rtable *rt = NULL;
 473         struct cxgbi_sock *csk = NULL;
 474         unsigned int mtu = 0;
 475         int port = 0xFFFF;
 476         int err = 0;
 477
 478         if (daddr->sin_family != AF_INET) {
 479                 pr_info("address family 0x%x NOT supported.\n",
 480                         daddr->sin_family);
 481                 err = -EAFNOSUPPORT;
 482                 goto err_out;
 483         }
 484
 485         rt = find_route_ipv4(0, daddr->sin_addr.s_addr, 0, daddr->sin_port, 0);
 486         if (!rt) {
 487                 pr_info("no route to ipv4 0x%x, port %u.\n",
 488                         daddr->sin_addr.s_addr, daddr->sin_port);
 489                 err = -ENETUNREACH;
 490                 goto err_out;
 491         }
 492         dst = &rt->dst;
 493         ndev = dst->neighbour->dev;
 494
 495         if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) {
 496                 pr_info("multi-cast route %pI4, port %u, dev %s.\n",
 497                         &daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
 498                         ndev->name);
 499                 err = -ENETUNREACH;
 500                 goto rel_rt;
 501         }
 502
 503         if (ndev->flags & IFF_LOOPBACK) {
 504                 ndev = ip_dev_find(&init_net, daddr->sin_addr.s_addr);
 505                 mtu = ndev->mtu;
 506                 pr_info("rt dev %s, loopback -> %s, mtu %u.\n",
 507                         dst->neighbour->dev->name, ndev->name, mtu);
 508         }
 509
 510         cdev = cxgbi_device_find_by_netdev(ndev, &port);
 511         if (!cdev) {
 512                 pr_info("dst %pI4, %s, NOT cxgbi device.\n",
 513                         &daddr->sin_addr.s_addr, ndev->name);
 514                 err = -ENETUNREACH;
 515                 goto rel_rt;
 516         }
 517         log_debug(1 << CXGBI_DBG_SOCK,
 518                 "route to %pI4 :%u, ndev p#%d,%s, cdev 0x%p.\n",
 519                 &daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
 520                            port, ndev->name, cdev);
 521
 522         csk = cxgbi_sock_create(cdev);
 523         if (!csk) {
 524                 err = -ENOMEM;
 525                 goto rel_rt;
 526         }
 527         csk->cdev = cdev;
 528         csk->port_id = port;
 529         csk->mtu = mtu;
 530         csk->dst = dst;
 531         csk->daddr.sin_addr.s_addr = daddr->sin_addr.s_addr;
 532         csk->daddr.sin_port = daddr->sin_port;
 533         csk->daddr.sin_family = daddr->sin_family;
 534         csk->saddr.sin_addr.s_addr = rt->rt_src;
 535
 536         return csk;
 537
 538 rel_rt:
 539         ip_rt_put(rt);
 540         if (csk)
 541                 cxgbi_sock_closed(csk);
 542 err_out:
 543         return ERR_PTR(err);
 544 }
 545
 546 void cxgbi_sock_established(struct cxgbi_sock *csk, unsigned int snd_isn,
 547                         unsigned int opt)
 548 {
 549         csk->write_seq = csk->snd_nxt = csk->snd_una = snd_isn;
 550         dst_confirm(csk->dst);
 551         smp_mb();
 552         cxgbi_sock_set_state(csk, CTP_ESTABLISHED);
 553 }
 554 EXPORT_SYMBOL_GPL(cxgbi_sock_established);
 555
 556 static void cxgbi_inform_iscsi_conn_closing(struct cxgbi_sock *csk)
 557 {
 558         log_debug(1 << CXGBI_DBG_SOCK,
 559                 "csk 0x%p, state %u, flags 0x%lx, conn 0x%p.\n",
 560                 csk, csk->state, csk->flags, csk->user_data);
 561
 562         if (csk->state != CTP_ESTABLISHED) {
 563                 read_lock_bh(&csk->callback_lock);
 564                 if (csk->user_data)
 565                         iscsi_conn_failure(csk->user_data,
 566                                         ISCSI_ERR_CONN_FAILED);
 567                 read_unlock_bh(&csk->callback_lock);
 568         }
 569 }
 570
 571 void cxgbi_sock_closed(struct cxgbi_sock *csk)
 572 {
 573         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 574                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 575         cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
 576         if (csk->state == CTP_ACTIVE_OPEN || csk->state == CTP_CLOSED)
 577                 return;
 578         if (csk->saddr.sin_port)
 579                 sock_put_port(csk);
 580         if (csk->dst)
 581                 dst_release(csk->dst);
 582         csk->cdev->csk_release_offload_resources(csk);
 583         cxgbi_sock_set_state(csk, CTP_CLOSED);
 584         cxgbi_inform_iscsi_conn_closing(csk);
 585         cxgbi_sock_put(csk);
 586 }
 587 EXPORT_SYMBOL_GPL(cxgbi_sock_closed);
 588
 589 static void need_active_close(struct cxgbi_sock *csk)
 590 {
 591         int data_lost;
 592         int close_req = 0;
 593
 594         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 595                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 596         spin_lock_bh(&csk->lock);
 597         dst_confirm(csk->dst);
 598         data_lost = skb_queue_len(&csk->receive_queue);
 599         __skb_queue_purge(&csk->receive_queue);
 600
 601         if (csk->state == CTP_ACTIVE_OPEN)
 602                 cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
 603         else if (csk->state == CTP_ESTABLISHED) {
 604                 close_req = 1;
 605                 cxgbi_sock_set_state(csk, CTP_ACTIVE_CLOSE);
 606         } else if (csk->state == CTP_PASSIVE_CLOSE) {
 607                 close_req = 1;
 608                 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
 609         }
 610
 611         if (close_req) {
 612                 if (data_lost)
 613                         csk->cdev->csk_send_abort_req(csk);
 614                 else
 615                         csk->cdev->csk_send_close_req(csk);
 616         }
 617
 618         spin_unlock_bh(&csk->lock);
 619 }
 620
 621 void cxgbi_sock_fail_act_open(struct cxgbi_sock *csk, int errno)
 622 {
 623         pr_info("csk 0x%p,%u,%lx, %pI4:%u-%pI4:%u, err %d.\n",
 624                         csk, csk->state, csk->flags,
 625                         &csk->saddr.sin_addr.s_addr, csk->saddr.sin_port,
 626                         &csk->daddr.sin_addr.s_addr, csk->daddr.sin_port,
 627                         errno);
 628
 629         cxgbi_sock_set_state(csk, CTP_CONNECTING);
 630         csk->err = errno;
 631         cxgbi_sock_closed(csk);
 632 }
 633 EXPORT_SYMBOL_GPL(cxgbi_sock_fail_act_open);
 634
 635 void cxgbi_sock_act_open_req_arp_failure(void *handle, struct sk_buff *skb)
 636 {
 637         struct cxgbi_sock *csk = (struct cxgbi_sock *)skb->sk;
 638
 639         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 640                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 641         cxgbi_sock_get(csk);
 642         spin_lock_bh(&csk->lock);
 643         if (csk->state == CTP_ACTIVE_OPEN)
 644                 cxgbi_sock_fail_act_open(csk, -EHOSTUNREACH);
 645         spin_unlock_bh(&csk->lock);
 646         cxgbi_sock_put(csk);
 647         __kfree_skb(skb);
 648 }
 649 EXPORT_SYMBOL_GPL(cxgbi_sock_act_open_req_arp_failure);
 650
 651 void cxgbi_sock_rcv_abort_rpl(struct cxgbi_sock *csk)
 652 {
 653         cxgbi_sock_get(csk);
 654         spin_lock_bh(&csk->lock);
 655         if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING)) {
 656                 if (!cxgbi_sock_flag(csk, CTPF_ABORT_RPL_RCVD))
 657                         cxgbi_sock_set_flag(csk, CTPF_ABORT_RPL_RCVD);
 658                 else {
 659                         cxgbi_sock_clear_flag(csk, CTPF_ABORT_RPL_RCVD);
 660                         cxgbi_sock_clear_flag(csk, CTPF_ABORT_RPL_PENDING);
 661                         if (cxgbi_sock_flag(csk, CTPF_ABORT_REQ_RCVD))
 662                                 pr_err("csk 0x%p,%u,0x%lx,%u,ABT_RPL_RSS.\n",
 663                                         csk, csk->state, csk->flags, csk->tid);
 664                         cxgbi_sock_closed(csk);
 665                 }
 666         }
 667         spin_unlock_bh(&csk->lock);
 668         cxgbi_sock_put(csk);
 669 }
 670 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_abort_rpl);
 671
 672 void cxgbi_sock_rcv_peer_close(struct cxgbi_sock *csk)
 673 {
 674         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 675                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 676         cxgbi_sock_get(csk);
 677         spin_lock_bh(&csk->lock);
 678
 679         if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
 680                 goto done;
 681
 682         switch (csk->state) {
 683         case CTP_ESTABLISHED:
 684                 cxgbi_sock_set_state(csk, CTP_PASSIVE_CLOSE);
 685                 break;
 686         case CTP_ACTIVE_CLOSE:
 687                 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
 688                 break;
 689         case CTP_CLOSE_WAIT_1:
 690                 cxgbi_sock_closed(csk);
 691                 break;
 692         case CTP_ABORTING:
 693                 break;
 694         default:
 695                 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
 696                         csk, csk->state, csk->flags, csk->tid);
 697         }
 698         cxgbi_inform_iscsi_conn_closing(csk);
 699 done:
 700         spin_unlock_bh(&csk->lock);
 701         cxgbi_sock_put(csk);
 702 }
 703 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_peer_close);
 704
 705 void cxgbi_sock_rcv_close_conn_rpl(struct cxgbi_sock *csk, u32 snd_nxt)
 706 {
 707         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 708                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 709         cxgbi_sock_get(csk);
 710         spin_lock_bh(&csk->lock);
 711
 712         csk->snd_una = snd_nxt - 1;
 713         if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
 714                 goto done;
 715
 716         switch (csk->state) {
 717         case CTP_ACTIVE_CLOSE:
 718                 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_1);
 719                 break;
 720         case CTP_CLOSE_WAIT_1:
 721         case CTP_CLOSE_WAIT_2:
 722                 cxgbi_sock_closed(csk);
 723                 break;
 724         case CTP_ABORTING:
 725                 break;
 726         default:
 727                 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
 728                         csk, csk->state, csk->flags, csk->tid);
 729         }
 730 done:
 731         spin_unlock_bh(&csk->lock);
 732         cxgbi_sock_put(csk);
 733 }
 734 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_close_conn_rpl);
 735
 736 void cxgbi_sock_rcv_wr_ack(struct cxgbi_sock *csk, unsigned int credits,
 737                            unsigned int snd_una, int seq_chk)
 738 {
 739         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 740                         "csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, snd_una %u,%d.\n",
 741                         csk, csk->state, csk->flags, csk->tid, credits,
 742                         csk->wr_cred, csk->wr_una_cred, snd_una, seq_chk);
 743
 744         spin_lock_bh(&csk->lock);
 745
 746         csk->wr_cred += credits;
 747         if (csk->wr_una_cred > csk->wr_max_cred - csk->wr_cred)
 748                 csk->wr_una_cred = csk->wr_max_cred - csk->wr_cred;
 749
 750         while (credits) {
 751                 struct sk_buff *p = cxgbi_sock_peek_wr(csk);
 752
 753                 if (unlikely(!p)) {
 754                         pr_err("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, empty.\n",
 755                                 csk, csk->state, csk->flags, csk->tid, credits,
 756                                 csk->wr_cred, csk->wr_una_cred);
 757                         break;
 758                 }
 759
 760                 if (unlikely(credits < p->csum)) {
 761                         pr_warn("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, < %u.\n",
 762                                 csk, csk->state, csk->flags, csk->tid,
 763                                 credits, csk->wr_cred, csk->wr_una_cred,
 764                                 p->csum);
 765                         p->csum -= credits;
 766                         break;
 767                 } else {
 768                         cxgbi_sock_dequeue_wr(csk);
 769                         credits -= p->csum;
 770                         kfree_skb(p);
 771                 }
 772         }
 773
 774         cxgbi_sock_check_wr_invariants(csk);
 775
 776         if (seq_chk) {
 777                 if (unlikely(before(snd_una, csk->snd_una))) {
 778                         pr_warn("csk 0x%p,%u,0x%lx,%u, snd_una %u/%u.",
 779                                 csk, csk->state, csk->flags, csk->tid, snd_una,
 780                                 csk->snd_una);
 781                         goto done;
 782                 }
 783
 784                 if (csk->snd_una != snd_una) {
 785                         csk->snd_una = snd_una;
 786                         dst_confirm(csk->dst);
 787                 }
 788         }
 789
 790         if (skb_queue_len(&csk->write_queue)) {
 791                 if (csk->cdev->csk_push_tx_frames(csk, 0))
 792                         cxgbi_conn_tx_open(csk);
 793         } else
 794                 cxgbi_conn_tx_open(csk);
 795 done:
 796         spin_unlock_bh(&csk->lock);
 797 }
 798 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_wr_ack);
 799
 800 static unsigned int cxgbi_sock_find_best_mtu(struct cxgbi_sock *csk,
 801                                              unsigned short mtu)
 802 {
 803         int i = 0;
 804
 805         while (i < csk->cdev->nmtus - 1 && csk->cdev->mtus[i + 1] <= mtu)
 806                 ++i;
 807
 808         return i;
 809 }
 810
 811 unsigned int cxgbi_sock_select_mss(struct cxgbi_sock *csk, unsigned int pmtu)
 812 {
 813         unsigned int idx;
 814         struct dst_entry *dst = csk->dst;
 815
 816         csk->advmss = dst_metric_advmss(dst);
 817
 818         if (csk->advmss > pmtu - 40)
 819                 csk->advmss = pmtu - 40;
 820         if (csk->advmss < csk->cdev->mtus[0] - 40)
 821                 csk->advmss = csk->cdev->mtus[0] - 40;
 822         idx = cxgbi_sock_find_best_mtu(csk, csk->advmss + 40);
 823
 824         return idx;
 825 }
 826 EXPORT_SYMBOL_GPL(cxgbi_sock_select_mss);
 827
 828 void cxgbi_sock_skb_entail(struct cxgbi_sock *csk, struct sk_buff *skb)
 829 {
 830         cxgbi_skcb_tcp_seq(skb) = csk->write_seq;
 831         __skb_queue_tail(&csk->write_queue, skb);
 832 }
 833 EXPORT_SYMBOL_GPL(cxgbi_sock_skb_entail);
 834
 835 void cxgbi_sock_purge_wr_queue(struct cxgbi_sock *csk)
 836 {
 837         struct sk_buff *skb;
 838
 839         while ((skb = cxgbi_sock_dequeue_wr(csk)) != NULL)
 840                 kfree_skb(skb);
 841 }
 842 EXPORT_SYMBOL_GPL(cxgbi_sock_purge_wr_queue);
 843
 844 void cxgbi_sock_check_wr_invariants(const struct cxgbi_sock *csk)
 845 {
 846         int pending = cxgbi_sock_count_pending_wrs(csk);
 847
 848         if (unlikely(csk->wr_cred + pending != csk->wr_max_cred))
 849                 pr_err("csk 0x%p, tid %u, credit %u + %u != %u.\n",
 850                         csk, csk->tid, csk->wr_cred, pending, csk->wr_max_cred);
 851 }
 852 EXPORT_SYMBOL_GPL(cxgbi_sock_check_wr_invariants);
 853
 854 static int cxgbi_sock_send_pdus(struct cxgbi_sock *csk, struct sk_buff *skb)
 855 {
 856         struct cxgbi_device *cdev = csk->cdev;
 857         struct sk_buff *next;
 858         int err, copied = 0;
 859
 860         spin_lock_bh(&csk->lock);
 861
 862         if (csk->state != CTP_ESTABLISHED) {
 863                 log_debug(1 << CXGBI_DBG_PDU_TX,
 864                         "csk 0x%p,%u,0x%lx,%u, EAGAIN.\n",
 865                         csk, csk->state, csk->flags, csk->tid);
 866                 err = -EAGAIN;
 867                 goto out_err;
 868         }
 869
 870         if (csk->err) {
 871                 log_debug(1 << CXGBI_DBG_PDU_TX,
 872                         "csk 0x%p,%u,0x%lx,%u, EPIPE %d.\n",
 873                         csk, csk->state, csk->flags, csk->tid, csk->err);
 874                 err = -EPIPE;
 875                 goto out_err;
 876         }
 877
 878         if (csk->write_seq - csk->snd_una >= cdev->snd_win) {
 879                 log_debug(1 << CXGBI_DBG_PDU_TX,
 880                         "csk 0x%p,%u,0x%lx,%u, FULL %u-%u >= %u.\n",
 881                         csk, csk->state, csk->flags, csk->tid, csk->write_seq,
 882                         csk->snd_una, cdev->snd_win);
 883                 err = -ENOBUFS;
 884                 goto out_err;
 885         }
 886
 887         while (skb) {
 888                 int frags = skb_shinfo(skb)->nr_frags +
 889                                 (skb->len != skb->data_len);
 890
 891                 if (unlikely(skb_headroom(skb) < cdev->skb_tx_rsvd)) {
 892                         pr_err("csk 0x%p, skb head %u < %u.\n",
 893                                 csk, skb_headroom(skb), cdev->skb_tx_rsvd);
 894                         err = -EINVAL;
 895                         goto out_err;
 896                 }
 897
 898                 if (frags >= SKB_WR_LIST_SIZE) {
 899                         pr_err("csk 0x%p, frags %d, %u,%u >%u.\n",
 900                                 csk, skb_shinfo(skb)->nr_frags, skb->len,
 901                                 skb->data_len, (uint)(SKB_WR_LIST_SIZE));
 902                         err = -EINVAL;
 903                         goto out_err;
 904                 }
 905
 906                 next = skb->next;
 907                 skb->next = NULL;
 908                 cxgbi_skcb_set_flag(skb, SKCBF_TX_NEED_HDR);
 909                 cxgbi_sock_skb_entail(csk, skb);
 910                 copied += skb->len;
 911                 csk->write_seq += skb->len +
 912                                 cxgbi_ulp_extra_len(cxgbi_skcb_ulp_mode(skb));
 913                 skb = next;
 914         }
 915 done:
 916         if (likely(skb_queue_len(&csk->write_queue)))
 917                 cdev->csk_push_tx_frames(csk, 1);
 918         spin_unlock_bh(&csk->lock);
 919         return copied;
 920
 921 out_err:
 922         if (copied == 0 && err == -EPIPE)
 923                 copied = csk->err ? csk->err : -EPIPE;
 924         else
 925                 copied = err;
 926         goto done;
 927 }
 928
 929 /*
 930  * Direct Data Placement -
 931  * Directly place the iSCSI Data-In or Data-Out PDU's payload into pre-posted
 932  * final destination host-memory buffers based on the Initiator Task Tag (ITT)
 933  * in Data-In or Target Task Tag (TTT) in Data-Out PDUs.
 934  * The host memory address is programmed into h/w in the format of pagepod
 935  * entries.
 936  * The location of the pagepod entry is encoded into ddp tag which is used as
 937  * the base for ITT/TTT.
 938  */
 939
 940 static unsigned char ddp_page_order[DDP_PGIDX_MAX] = {0, 1, 2, 4};
 941 static unsigned char ddp_page_shift[DDP_PGIDX_MAX] = {12, 13, 14, 16};
 942 static unsigned char page_idx = DDP_PGIDX_MAX;
 943
 944 static unsigned char sw_tag_idx_bits;
 945 static unsigned char sw_tag_age_bits;
 946
 947 /*
 948  * Direct-Data Placement page size adjustment
 949  */
 950 static int ddp_adjust_page_table(void)
 951 {
 952         int i;
 953         unsigned int base_order, order;
 954
 955         if (PAGE_SIZE < (1UL << ddp_page_shift[0])) {
 956                 pr_info("PAGE_SIZE 0x%lx too small, min 0x%lx\n",
 957                         PAGE_SIZE, 1UL << ddp_page_shift[0]);
 958                 return -EINVAL;
 959         }
 960
 961         base_order = get_order(1UL << ddp_page_shift[0]);
 962         order = get_order(1UL << PAGE_SHIFT);
 963
 964         for (i = 0; i < DDP_PGIDX_MAX; i++) {
 965                 /* first is the kernel page size, then just doubling */
 966                 ddp_page_order[i] = order - base_order + i;
 967                 ddp_page_shift[i] = PAGE_SHIFT + i;
 968         }
 969         return 0;
 970 }
 971
 972 static int ddp_find_page_index(unsigned long pgsz)
 973 {
 974         int i;
 975
 976         for (i = 0; i < DDP_PGIDX_MAX; i++) {
 977                 if (pgsz == (1UL << ddp_page_shift[i]))
 978                         return i;
 979         }
 980         pr_info("ddp page size %lu not supported.\n", pgsz);
 981         return DDP_PGIDX_MAX;
 982 }
 983
 984 static void ddp_setup_host_page_size(void)
 985 {
 986         if (page_idx == DDP_PGIDX_MAX) {
 987                 page_idx = ddp_find_page_index(PAGE_SIZE);
 988
 989                 if (page_idx == DDP_PGIDX_MAX) {
 990                         pr_info("system PAGE %lu, update hw.\n", PAGE_SIZE);
 991                         if (ddp_adjust_page_table() < 0) {
 992                                 pr_info("PAGE %lu, disable ddp.\n", PAGE_SIZE);
 993                                 return;
 994                         }
 995                         page_idx = ddp_find_page_index(PAGE_SIZE);
 996                 }
 997                 pr_info("system PAGE %lu, ddp idx %u.\n", PAGE_SIZE, page_idx);
 998         }
 999 }
1000
1001 void cxgbi_ddp_page_size_factor(int *pgsz_factor)
1002 {
1003         int i;
1004
1005         for (i = 0; i < DDP_PGIDX_MAX; i++)
1006                 pgsz_factor[i] = ddp_page_order[i];
1007 }
1008 EXPORT_SYMBOL_GPL(cxgbi_ddp_page_size_factor);
1009
1010 /*
1011  * DDP setup & teardown
1012  */
1013
1014 void cxgbi_ddp_ppod_set(struct cxgbi_pagepod *ppod,
1015                         struct cxgbi_pagepod_hdr *hdr,
1016                         struct cxgbi_gather_list *gl, unsigned int gidx)
1017 {
1018         int i;
1019
1020         memcpy(ppod, hdr, sizeof(*hdr));
1021         for (i = 0; i < (PPOD_PAGES_MAX + 1); i++, gidx++) {
1022                 ppod->addr[i] = gidx < gl->nelem ?
1023                                 cpu_to_be64(gl->phys_addr[gidx]) : 0ULL;
1024         }
1025 }
1026 EXPORT_SYMBOL_GPL(cxgbi_ddp_ppod_set);
1027
1028 void cxgbi_ddp_ppod_clear(struct cxgbi_pagepod *ppod)
1029 {
1030         memset(ppod, 0, sizeof(*ppod));
1031 }
1032 EXPORT_SYMBOL_GPL(cxgbi_ddp_ppod_clear);
1033
1034 static inline int ddp_find_unused_entries(struct cxgbi_ddp_info *ddp,
1035                                         unsigned int start, unsigned int max,
1036                                         unsigned int count,
1037                                         struct cxgbi_gather_list *gl)
1038 {
1039         unsigned int i, j, k;
1040
1041         /*  not enough entries */
1042         if ((max - start) < count) {
1043                 log_debug(1 << CXGBI_DBG_DDP,
1044                         "NOT enough entries %u+%u < %u.\n", start, count, max);
1045                 return -EBUSY;
1046         }
1047
1048         max -= count;
1049         spin_lock(&ddp->map_lock);
1050         for (i = start; i < max;) {
1051                 for (j = 0, k = i; j < count; j++, k++) {
1052                         if (ddp->gl_map[k])
1053                                 break;
1054                 }
1055                 if (j == count) {
1056                         for (j = 0, k = i; j < count; j++, k++)
1057                                 ddp->gl_map[k] = gl;
1058                         spin_unlock(&ddp->map_lock);
1059                         return i;
1060                 }
1061                 i += j + 1;
1062         }
1063         spin_unlock(&ddp->map_lock);
1064         log_debug(1 << CXGBI_DBG_DDP,
1065                 "NO suitable entries %u available.\n", count);
1066         return -EBUSY;
1067 }
1068
1069 static inline void ddp_unmark_entries(struct cxgbi_ddp_info *ddp,
1070                                                 int start, int count)
1071 {
1072         spin_lock(&ddp->map_lock);
1073         memset(&ddp->gl_map[start], 0,
1074                 count * sizeof(struct cxgbi_gather_list *));
1075         spin_unlock(&ddp->map_lock);
1076 }
1077
1078 static inline void ddp_gl_unmap(struct pci_dev *pdev,
1079                                         struct cxgbi_gather_list *gl)
1080 {
1081         int i;
1082
1083         for (i = 0; i < gl->nelem; i++)
1084                 dma_unmap_page(&pdev->dev, gl->phys_addr[i], PAGE_SIZE,
1085                                 PCI_DMA_FROMDEVICE);
1086 }
1087
1088 static inline int ddp_gl_map(struct pci_dev *pdev,
1089                                     struct cxgbi_gather_list *gl)
1090 {
1091         int i;
1092
1093         for (i = 0; i < gl->nelem; i++) {
1094                 gl->phys_addr[i] = dma_map_page(&pdev->dev, gl->pages[i], 0,
1095                                                 PAGE_SIZE,
1096                                                 PCI_DMA_FROMDEVICE);
1097                 if (unlikely(dma_mapping_error(&pdev->dev, gl->phys_addr[i]))) {
1098                         log_debug(1 << CXGBI_DBG_DDP,
1099                                 "page %d 0x%p, 0x%p dma mapping err.\n",
1100                                 i, gl->pages[i], pdev);
1101                         goto unmap;
1102                 }
1103         }
1104         return i;
1105 unmap:
1106         if (i) {
1107                 unsigned int nelem = gl->nelem;
1108
1109                 gl->nelem = i;
1110                 ddp_gl_unmap(pdev, gl);
1111                 gl->nelem = nelem;
1112         }
1113         return -EINVAL;
1114 }
1115
1116 static void ddp_release_gl(struct cxgbi_gather_list *gl,
1117                                   struct pci_dev *pdev)
1118 {
1119         ddp_gl_unmap(pdev, gl);
1120         kfree(gl);
1121 }
1122
1123 static struct cxgbi_gather_list *ddp_make_gl(unsigned int xferlen,
1124                                                     struct scatterlist *sgl,
1125                                                     unsigned int sgcnt,
1126                                                     struct pci_dev *pdev,
1127                                                     gfp_t gfp)
1128 {
1129         struct cxgbi_gather_list *gl;
1130         struct scatterlist *sg = sgl;
1131         struct page *sgpage = sg_page(sg);
1132         unsigned int sglen = sg->length;
1133         unsigned int sgoffset = sg->offset;
1134         unsigned int npages = (xferlen + sgoffset + PAGE_SIZE - 1) >>
1135                                 PAGE_SHIFT;
1136         int i = 1, j = 0;
1137
1138         if (xferlen < DDP_THRESHOLD) {
1139                 log_debug(1 << CXGBI_DBG_DDP,
1140                         "xfer %u < threshold %u, no ddp.\n",
1141                         xferlen, DDP_THRESHOLD);
1142                 return NULL;
1143         }
1144
1145         gl = kzalloc(sizeof(struct cxgbi_gather_list) +
1146                      npages * (sizeof(dma_addr_t) +
1147                      sizeof(struct page *)), gfp);
1148         if (!gl) {
1149                 log_debug(1 << CXGBI_DBG_DDP,
1150                         "xfer %u, %u pages, OOM.\n", xferlen, npages);
1151                 return NULL;
1152         }
1153
1154          log_debug(1 << CXGBI_DBG_DDP,
1155                 "xfer %u, sgl %u, gl max %u.\n", xferlen, sgcnt, npages);
1156
1157         gl->pages = (struct page **)&gl->phys_addr[npages];
1158         gl->nelem = npages;
1159         gl->length = xferlen;
1160         gl->offset = sgoffset;
1161         gl->pages[0] = sgpage;
1162
1163         for (i = 1, sg = sg_next(sgl), j = 0; i < sgcnt;
1164                 i++, sg = sg_next(sg)) {
1165                 struct page *page = sg_page(sg);
1166
1167                 if (sgpage == page && sg->offset == sgoffset + sglen)
1168                         sglen += sg->length;
1169                 else {
1170                         /*  make sure the sgl is fit for ddp:
1171                          *  each has the same page size, and
1172                          *  all of the middle pages are used completely
1173                          */
1174                         if ((j && sgoffset) || ((i != sgcnt - 1) &&
1175                             ((sglen + sgoffset) & ~PAGE_MASK))) {
1176                                 log_debug(1 << CXGBI_DBG_DDP,
1177                                         "page %d/%u, %u + %u.\n",
1178                                         i, sgcnt, sgoffset, sglen);
1179                                 goto error_out;
1180                         }
1181
1182                         j++;
1183                         if (j == gl->nelem || sg->offset) {
1184                                 log_debug(1 << CXGBI_DBG_DDP,
1185                                         "page %d/%u, offset %u.\n",
1186                                         j, gl->nelem, sg->offset);
1187                                 goto error_out;
1188                         }
1189                         gl->pages[j] = page;
1190                         sglen = sg->length;
1191                         sgoffset = sg->offset;
1192                         sgpage = page;
1193                 }
1194         }
1195         gl->nelem = ++j;
1196
1197         if (ddp_gl_map(pdev, gl) < 0)
1198                 goto error_out;
1199
1200         return gl;
1201
1202 error_out:
1203         kfree(gl);
1204         return NULL;
1205 }
1206
1207 static void ddp_tag_release(struct cxgbi_hba *chba, u32 tag)
1208 {
1209         struct cxgbi_device *cdev = chba->cdev;
1210         struct cxgbi_ddp_info *ddp = cdev->ddp;
1211         u32 idx;
1212
1213         idx = (tag >> PPOD_IDX_SHIFT) & ddp->idx_mask;
1214         if (idx < ddp->nppods) {
1215                 struct cxgbi_gather_list *gl = ddp->gl_map[idx];
1216                 unsigned int npods;
1217
1218                 if (!gl || !gl->nelem) {
1219                         pr_warn("tag 0x%x, idx %u, gl 0x%p, %u.\n",
1220                                 tag, idx, gl, gl ? gl->nelem : 0);
1221                         return;
1222                 }
1223                 npods = (gl->nelem + PPOD_PAGES_MAX - 1) >> PPOD_PAGES_SHIFT;
1224                 log_debug(1 << CXGBI_DBG_DDP,
1225                         "tag 0x%x, release idx %u, npods %u.\n",
1226                         tag, idx, npods);
1227                 cdev->csk_ddp_clear(chba, tag, idx, npods);
1228                 ddp_unmark_entries(ddp, idx, npods);
1229                 ddp_release_gl(gl, ddp->pdev);
1230         } else
1231                 pr_warn("tag 0x%x, idx %u > max %u.\n", tag, idx, ddp->nppods);
1232 }
1233
1234 static int ddp_tag_reserve(struct cxgbi_sock *csk, unsigned int tid,
1235                            u32 sw_tag, u32 *tagp, struct cxgbi_gather_list *gl,
1236                            gfp_t gfp)
1237 {
1238         struct cxgbi_device *cdev = csk->cdev;
1239         struct cxgbi_ddp_info *ddp = cdev->ddp;
1240         struct cxgbi_tag_format *tformat = &cdev->tag_format;
1241         struct cxgbi_pagepod_hdr hdr;
1242         unsigned int npods;
1243         int idx = -1;
1244         int err = -ENOMEM;
1245         u32 tag;
1246
1247         npods = (gl->nelem + PPOD_PAGES_MAX - 1) >> PPOD_PAGES_SHIFT;
1248         if (ddp->idx_last == ddp->nppods)
1249                 idx = ddp_find_unused_entries(ddp, 0, ddp->nppods,
1250                                                         npods, gl);
1251         else {
1252                 idx = ddp_find_unused_entries(ddp, ddp->idx_last + 1,
1253                                                         ddp->nppods, npods,
1254                                                         gl);
1255                 if (idx < 0 && ddp->idx_last >= npods) {
1256                         idx = ddp_find_unused_entries(ddp, 0,
1257                                 min(ddp->idx_last + npods, ddp->nppods),
1258                                                         npods, gl);
1259                 }
1260         }
1261         if (idx < 0) {
1262                 log_debug(1 << CXGBI_DBG_DDP,
1263                         "xferlen %u, gl %u, npods %u NO DDP.\n",
1264                         gl->length, gl->nelem, npods);
1265                 return idx;
1266         }
1267
1268         tag = cxgbi_ddp_tag_base(tformat, sw_tag);
1269         tag |= idx << PPOD_IDX_SHIFT;
1270
1271         hdr.rsvd = 0;
1272         hdr.vld_tid = htonl(PPOD_VALID_FLAG | PPOD_TID(tid));
1273         hdr.pgsz_tag_clr = htonl(tag & ddp->rsvd_tag_mask);
1274         hdr.max_offset = htonl(gl->length);
1275         hdr.page_offset = htonl(gl->offset);
1276
1277         err = cdev->csk_ddp_set(csk, &hdr, idx, npods, gl);
1278         if (err < 0)
1279                 goto unmark_entries;
1280
1281         ddp->idx_last = idx;
1282         log_debug(1 << CXGBI_DBG_DDP,
1283                 "xfer %u, gl %u,%u, tid 0x%x, tag 0x%x->0x%x(%u,%u).\n",
1284                 gl->length, gl->nelem, gl->offset, tid, sw_tag, tag, idx,
1285                 npods);
1286         *tagp = tag;
1287         return 0;
1288
1289 unmark_entries:
1290         ddp_unmark_entries(ddp, idx, npods);
1291         return err;
1292 }
1293
1294 int cxgbi_ddp_reserve(struct cxgbi_sock *csk, unsigned int *tagp,
1295                         unsigned int sw_tag, unsigned int xferlen,
1296                         struct scatterlist *sgl, unsigned int sgcnt, gfp_t gfp)
1297 {
1298         struct cxgbi_device *cdev = csk->cdev;
1299         struct cxgbi_tag_format *tformat = &cdev->tag_format;
1300         struct cxgbi_gather_list *gl;
1301         int err;
1302
1303         if (page_idx >= DDP_PGIDX_MAX || !cdev->ddp ||
1304             xferlen < DDP_THRESHOLD) {
1305                 log_debug(1 << CXGBI_DBG_DDP,
1306                         "pgidx %u, xfer %u, NO ddp.\n", page_idx, xferlen);
1307                 return -EINVAL;
1308         }
1309
1310         if (!cxgbi_sw_tag_usable(tformat, sw_tag)) {
1311                 log_debug(1 << CXGBI_DBG_DDP,
1312                         "sw_tag 0x%x NOT usable.\n", sw_tag);
1313                 return -EINVAL;
1314         }
1315
1316         gl = ddp_make_gl(xferlen, sgl, sgcnt, cdev->pdev, gfp);
1317         if (!gl)
1318                 return -ENOMEM;
1319
1320         err = ddp_tag_reserve(csk, csk->tid, sw_tag, tagp, gl, gfp);
1321         if (err < 0)
1322                 ddp_release_gl(gl, cdev->pdev);
1323
1324         return err;
1325 }
1326
1327 static void ddp_destroy(struct kref *kref)
1328 {
1329         struct cxgbi_ddp_info *ddp = container_of(kref,
1330                                                 struct cxgbi_ddp_info,
1331                                                 refcnt);
1332         struct cxgbi_device *cdev = ddp->cdev;
1333         int i = 0;
1334
1335         pr_info("kref 0, destroy ddp 0x%p, cdev 0x%p.\n", ddp, cdev);
1336
1337         while (i < ddp->nppods) {
1338                 struct cxgbi_gather_list *gl = ddp->gl_map[i];
1339
1340                 if (gl) {
1341                         int npods = (gl->nelem + PPOD_PAGES_MAX - 1)
1342                                         >> PPOD_PAGES_SHIFT;
1343                         pr_info("cdev 0x%p, ddp %d + %d.\n", cdev, i, npods);
1344                         kfree(gl);
1345                         i += npods;
1346                 } else
1347                         i++;
1348         }
1349         cxgbi_free_big_mem(ddp);
1350 }
1351
1352 int cxgbi_ddp_cleanup(struct cxgbi_device *cdev)
1353 {
1354         struct cxgbi_ddp_info *ddp = cdev->ddp;
1355
1356         log_debug(1 << CXGBI_DBG_DDP,
1357                 "cdev 0x%p, release ddp 0x%p.\n", cdev, ddp);
1358         cdev->ddp = NULL;
1359         if (ddp)
1360                 return kref_put(&ddp->refcnt, ddp_destroy);
1361         return 0;
1362 }
1363 EXPORT_SYMBOL_GPL(cxgbi_ddp_cleanup);
1364
1365 int cxgbi_ddp_init(struct cxgbi_device *cdev,
1366                    unsigned int llimit, unsigned int ulimit,
1367                    unsigned int max_txsz, unsigned int max_rxsz)
1368 {
1369         struct cxgbi_ddp_info *ddp;
1370         unsigned int ppmax, bits;
1371
1372         ppmax = (ulimit - llimit + 1) >> PPOD_SIZE_SHIFT;
1373         bits = __ilog2_u32(ppmax) + 1;
1374         if (bits > PPOD_IDX_MAX_SIZE)
1375                 bits = PPOD_IDX_MAX_SIZE;
1376         ppmax = (1 << (bits - 1)) - 1;
1377
1378         ddp = cxgbi_alloc_big_mem(sizeof(struct cxgbi_ddp_info) +
1379                                 ppmax * (sizeof(struct cxgbi_gather_list *) +
1380                                          sizeof(struct sk_buff *)),
1381                                 GFP_KERNEL);
1382         if (!ddp) {
1383                 pr_warn("cdev 0x%p, ddp ppmax %u OOM.\n", cdev, ppmax);
1384                 return -ENOMEM;
1385         }
1386         ddp->gl_map = (struct cxgbi_gather_list **)(ddp + 1);
1387         cdev->ddp = ddp;
1388
1389         spin_lock_init(&ddp->map_lock);
1390         kref_init(&ddp->refcnt);
1391
1392         ddp->cdev = cdev;
1393         ddp->pdev = cdev->pdev;
1394         ddp->llimit = llimit;
1395         ddp->ulimit = ulimit;
1396         ddp->max_txsz = min_t(unsigned int, max_txsz, ULP2_MAX_PKT_SIZE);
1397         ddp->max_rxsz = min_t(unsigned int, max_rxsz, ULP2_MAX_PKT_SIZE);
1398         ddp->nppods = ppmax;
1399         ddp->idx_last = ppmax;
1400         ddp->idx_bits = bits;
1401         ddp->idx_mask = (1 << bits) - 1;
1402         ddp->rsvd_tag_mask = (1 << (bits + PPOD_IDX_SHIFT)) - 1;
1403
1404         cdev->tag_format.sw_bits = sw_tag_idx_bits + sw_tag_age_bits;
1405         cdev->tag_format.rsvd_bits = ddp->idx_bits;
1406         cdev->tag_format.rsvd_shift = PPOD_IDX_SHIFT;
1407         cdev->tag_format.rsvd_mask = (1 << cdev->tag_format.rsvd_bits) - 1;
1408
1409         pr_info("%s tag format, sw %u, rsvd %u,%u, mask 0x%x.\n",
1410                 cdev->ports[0]->name, cdev->tag_format.sw_bits,
1411                 cdev->tag_format.rsvd_bits, cdev->tag_format.rsvd_shift,
1412                 cdev->tag_format.rsvd_mask);
1413
1414         cdev->tx_max_size = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
1415                                 ddp->max_txsz - ISCSI_PDU_NONPAYLOAD_LEN);
1416         cdev->rx_max_size = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
1417                                 ddp->max_rxsz - ISCSI_PDU_NONPAYLOAD_LEN);
1418
1419         log_debug(1 << CXGBI_DBG_DDP,
1420                 "%s max payload size: %u/%u, %u/%u.\n",
1421                 cdev->ports[0]->name, cdev->tx_max_size, ddp->max_txsz,
1422                 cdev->rx_max_size, ddp->max_rxsz);
1423         return 0;
1424 }
1425 EXPORT_SYMBOL_GPL(cxgbi_ddp_init);
1426
1427 /*
1428  * APIs interacting with open-iscsi libraries
1429  */
1430
1431 static unsigned char padding[4];
1432
1433 static void task_release_itt(struct iscsi_task *task, itt_t hdr_itt)
1434 {
1435         struct scsi_cmnd *sc = task->sc;
1436         struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
1437         struct cxgbi_conn *cconn = tcp_conn->dd_data;
1438         struct cxgbi_hba *chba = cconn->chba;
1439         struct cxgbi_tag_format *tformat = &chba->cdev->tag_format;
1440         u32 tag = ntohl((__force u32)hdr_itt);
1441
1442         log_debug(1 << CXGBI_DBG_DDP,
1443                    "cdev 0x%p, release tag 0x%x.\n", chba->cdev, tag);
1444         if (sc &&
1445             (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE) &&
1446             cxgbi_is_ddp_tag(tformat, tag))
1447                 ddp_tag_release(chba, tag);
1448 }
1449
1450 static int task_reserve_itt(struct iscsi_task *task, itt_t *hdr_itt)
1451 {
1452         struct scsi_cmnd *sc = task->sc;
1453         struct iscsi_conn *conn = task->conn;
1454         struct iscsi_session *sess = conn->session;
1455         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1456         struct cxgbi_conn *cconn = tcp_conn->dd_data;
1457         struct cxgbi_hba *chba = cconn->chba;
1458         struct cxgbi_tag_format *tformat = &chba->cdev->tag_format;
1459         u32 sw_tag = (sess->age << cconn->task_idx_bits) | task->itt;
1460         u32 tag = 0;
1461         int err = -EINVAL;
1462
1463         if (sc &&
1464             (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE)) {
1465                 err = cxgbi_ddp_reserve(cconn->cep->csk, &tag, sw_tag,
1466                                         scsi_in(sc)->length,
1467                                         scsi_in(sc)->table.sgl,
1468                                         scsi_in(sc)->table.nents,
1469                                         GFP_ATOMIC);
1470                 if (err < 0)
1471                         log_debug(1 << CXGBI_DBG_DDP,
1472                                 "csk 0x%p, R task 0x%p, %u,%u, no ddp.\n",
1473                                 cconn->cep->csk, task, scsi_in(sc)->length,
1474                                 scsi_in(sc)->table.nents);
1475         }
1476
1477         if (err < 0)
1478                 tag = cxgbi_set_non_ddp_tag(tformat, sw_tag);
1479         /*  the itt need to sent in big-endian order */
1480         *hdr_itt = (__force itt_t)htonl(tag);
1481
1482         log_debug(1 << CXGBI_DBG_DDP,
1483                 "cdev 0x%p, task 0x%p, 0x%x(0x%x,0x%x)->0x%x/0x%x.\n",
1484                 chba->cdev, task, sw_tag, task->itt, sess->age, tag, *hdr_itt);
1485         return 0;
1486 }
1487
1488 void cxgbi_parse_pdu_itt(struct iscsi_conn *conn, itt_t itt, int *idx, int *age)
1489 {
1490         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1491         struct cxgbi_conn *cconn = tcp_conn->dd_data;
1492         struct cxgbi_device *cdev = cconn->chba->cdev;
1493         u32 tag = ntohl((__force u32) itt);
1494         u32 sw_bits;
1495
1496         sw_bits = cxgbi_tag_nonrsvd_bits(&cdev->tag_format, tag);
1497         if (idx)
1498                 *idx = sw_bits & ((1 << cconn->task_idx_bits) - 1);
1499         if (age)
1500                 *age = (sw_bits >> cconn->task_idx_bits) & ISCSI_AGE_MASK;
1501
1502         log_debug(1 << CXGBI_DBG_DDP,
1503                 "cdev 0x%p, tag 0x%x/0x%x, -> 0x%x(0x%x,0x%x).\n",
1504                 cdev, tag, itt, sw_bits, idx ? *idx : 0xFFFFF,
1505                 age ? *age : 0xFF);
1506 }
1507 EXPORT_SYMBOL_GPL(cxgbi_parse_pdu_itt);
1508
1509 void cxgbi_conn_tx_open(struct cxgbi_sock *csk)
1510 {
1511         struct iscsi_conn *conn = csk->user_data;
1512
1513         if (conn) {
1514                 log_debug(1 << CXGBI_DBG_SOCK,
1515                         "csk 0x%p, cid %d.\n", csk, conn->id);
1516                 iscsi_conn_queue_work(conn);
1517         }
1518 }
1519 EXPORT_SYMBOL_GPL(cxgbi_conn_tx_open);
1520
1521 /*
1522  * pdu receive, interact with libiscsi_tcp
1523  */
1524 static inline int read_pdu_skb(struct iscsi_conn *conn,
1525                                struct sk_buff *skb,
1526                                unsigned int offset,
1527                                int offloaded)
1528 {
1529         int status = 0;
1530         int bytes_read;
1531
1532         bytes_read = iscsi_tcp_recv_skb(conn, skb, offset, offloaded, &status);
1533         switch (status) {
1534         case ISCSI_TCP_CONN_ERR:
1535                 pr_info("skb 0x%p, off %u, %d, TCP_ERR.\n",
1536                           skb, offset, offloaded);
1537                 return -EIO;
1538         case ISCSI_TCP_SUSPENDED:
1539                 log_debug(1 << CXGBI_DBG_PDU_RX,
1540                         "skb 0x%p, off %u, %d, TCP_SUSPEND, rc %d.\n",
1541                         skb, offset, offloaded, bytes_read);
1542                 /* no transfer - just have caller flush queue */
1543                 return bytes_read;
1544         case ISCSI_TCP_SKB_DONE:
1545                 pr_info("skb 0x%p, off %u, %d, TCP_SKB_DONE.\n",
1546                         skb, offset, offloaded);
1547                 /*
1548                  * pdus should always fit in the skb and we should get
1549                  * segment done notifcation.
1550                  */
1551                 iscsi_conn_printk(KERN_ERR, conn, "Invalid pdu or skb.");
1552                 return -EFAULT;
1553         case ISCSI_TCP_SEGMENT_DONE:
1554                 log_debug(1 << CXGBI_DBG_PDU_RX,
1555                         "skb 0x%p, off %u, %d, TCP_SEG_DONE, rc %d.\n",
1556                         skb, offset, offloaded, bytes_read);
1557                 return bytes_read;
1558         default:
1559                 pr_info("skb 0x%p, off %u, %d, invalid status %d.\n",
1560                         skb, offset, offloaded, status);
1561                 return -EINVAL;
1562         }
1563 }
1564
1565 static int skb_read_pdu_bhs(struct iscsi_conn *conn, struct sk_buff *skb)
1566 {
1567         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1568
1569         log_debug(1 << CXGBI_DBG_PDU_RX,
1570                 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1571                 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1572
1573         if (!iscsi_tcp_recv_segment_is_hdr(tcp_conn)) {
1574                 pr_info("conn 0x%p, skb 0x%p, not hdr.\n", conn, skb);
1575                 iscsi_conn_failure(conn, ISCSI_ERR_PROTO);
1576                 return -EIO;
1577         }
1578
1579         if (conn->hdrdgst_en &&
1580             cxgbi_skcb_test_flag(skb, SKCBF_RX_HCRC_ERR)) {
1581                 pr_info("conn 0x%p, skb 0x%p, hcrc.\n", conn, skb);
1582                 iscsi_conn_failure(conn, ISCSI_ERR_HDR_DGST);
1583                 return -EIO;
1584         }
1585
1586         return read_pdu_skb(conn, skb, 0, 0);
1587 }
1588
1589 static int skb_read_pdu_data(struct iscsi_conn *conn, struct sk_buff *lskb,
1590                              struct sk_buff *skb, unsigned int offset)
1591 {
1592         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1593         bool offloaded = 0;
1594         int opcode = tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK;
1595
1596         log_debug(1 << CXGBI_DBG_PDU_RX,
1597                 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1598                 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1599
1600         if (conn->datadgst_en &&
1601             cxgbi_skcb_test_flag(lskb, SKCBF_RX_DCRC_ERR)) {
1602                 pr_info("conn 0x%p, skb 0x%p, dcrc 0x%lx.\n",
1603                         conn, lskb, cxgbi_skcb_flags(lskb));
1604                 iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST);
1605                 return -EIO;
1606         }
1607
1608         if (iscsi_tcp_recv_segment_is_hdr(tcp_conn))
1609                 return 0;
1610
1611         /* coalesced, add header digest length */
1612         if (lskb == skb && conn->hdrdgst_en)
1613                 offset += ISCSI_DIGEST_SIZE;
1614
1615         if (cxgbi_skcb_test_flag(lskb, SKCBF_RX_DATA_DDPD))
1616                 offloaded = 1;
1617
1618         if (opcode == ISCSI_OP_SCSI_DATA_IN)
1619                 log_debug(1 << CXGBI_DBG_PDU_RX,
1620                         "skb 0x%p, op 0x%x, itt 0x%x, %u %s ddp'ed.\n",
1621                         skb, opcode, ntohl(tcp_conn->in.hdr->itt),
1622                         tcp_conn->in.datalen, offloaded ? "is" : "not");
1623
1624         return read_pdu_skb(conn, skb, offset, offloaded);
1625 }
1626
1627 static void csk_return_rx_credits(struct cxgbi_sock *csk, int copied)
1628 {
1629         struct cxgbi_device *cdev = csk->cdev;
1630         int must_send;
1631         u32 credits;
1632
1633         log_debug(1 << CXGBI_DBG_PDU_RX,
1634                 "csk 0x%p,%u,0x%lu,%u, seq %u, wup %u, thre %u, %u.\n",
1635                 csk, csk->state, csk->flags, csk->tid, csk->copied_seq,
1636                 csk->rcv_wup, cdev->rx_credit_thres,
1637                 cdev->rcv_win);
1638
1639         if (csk->state != CTP_ESTABLISHED)
1640                 return;
1641
1642         credits = csk->copied_seq - csk->rcv_wup;
1643         if (unlikely(!credits))
1644                 return;
1645         if (unlikely(cdev->rx_credit_thres == 0))
1646                 return;
1647
1648         must_send = credits + 16384 >= cdev->rcv_win;
1649         if (must_send || credits >= cdev->rx_credit_thres)
1650                 csk->rcv_wup += cdev->csk_send_rx_credits(csk, credits);
1651 }
1652
1653 void cxgbi_conn_pdu_ready(struct cxgbi_sock *csk)
1654 {
1655         struct cxgbi_device *cdev = csk->cdev;
1656         struct iscsi_conn *conn = csk->user_data;
1657         struct sk_buff *skb;
1658         unsigned int read = 0;
1659         int err = 0;
1660
1661         log_debug(1 << CXGBI_DBG_PDU_RX,
1662                 "csk 0x%p, conn 0x%p.\n", csk, conn);
1663
1664         if (unlikely(!conn || conn->suspend_rx)) {
1665                 log_debug(1 << CXGBI_DBG_PDU_RX,
1666                         "csk 0x%p, conn 0x%p, id %d, suspend_rx %lu!\n",
1667                         csk, conn, conn ? conn->id : 0xFF,
1668                         conn ? conn->suspend_rx : 0xFF);
1669                 return;
1670         }
1671
1672         while (!err) {
1673                 skb = skb_peek(&csk->receive_queue);
1674                 if (!skb ||
1675                     !(cxgbi_skcb_test_flag(skb, SKCBF_RX_STATUS))) {
1676                         if (skb)
1677                                 log_debug(1 << CXGBI_DBG_PDU_RX,
1678                                         "skb 0x%p, NOT ready 0x%lx.\n",
1679                                         skb, cxgbi_skcb_flags(skb));
1680                         break;
1681                 }
1682                 __skb_unlink(skb, &csk->receive_queue);
1683
1684                 read += cxgbi_skcb_rx_pdulen(skb);
1685                 log_debug(1 << CXGBI_DBG_PDU_RX,
1686                         "csk 0x%p, skb 0x%p,%u,f 0x%lx, pdu len %u.\n",
1687                         csk, skb, skb->len, cxgbi_skcb_flags(skb),
1688                         cxgbi_skcb_rx_pdulen(skb));
1689
1690                 if (cxgbi_skcb_test_flag(skb, SKCBF_RX_COALESCED)) {
1691                         err = skb_read_pdu_bhs(conn, skb);
1692                         if (err < 0) {
1693                                 pr_err("coalesced bhs, csk 0x%p, skb 0x%p,%u, "
1694                                         "f 0x%lx, plen %u.\n",
1695                                         csk, skb, skb->len,
1696                                         cxgbi_skcb_flags(skb),
1697                                         cxgbi_skcb_rx_pdulen(skb));
1698                                 goto skb_done;
1699                         }
1700                         err = skb_read_pdu_data(conn, skb, skb,
1701                                                 err + cdev->skb_rx_extra);
1702                         if (err < 0)
1703                                 pr_err("coalesced data, csk 0x%p, skb 0x%p,%u, "
1704                                         "f 0x%lx, plen %u.\n",
1705                                         csk, skb, skb->len,
1706                                         cxgbi_skcb_flags(skb),
1707                                         cxgbi_skcb_rx_pdulen(skb));
1708                 } else {
1709                         err = skb_read_pdu_bhs(conn, skb);
1710                         if (err < 0) {
1711                                 pr_err("bhs, csk 0x%p, skb 0x%p,%u, "
1712                                         "f 0x%lx, plen %u.\n",
1713                                         csk, skb, skb->len,
1714                                         cxgbi_skcb_flags(skb),
1715                                         cxgbi_skcb_rx_pdulen(skb));
1716                                 goto skb_done;
1717                         }
1718
1719                         if (cxgbi_skcb_test_flag(skb, SKCBF_RX_DATA)) {
1720                                 struct sk_buff *dskb;
1721
1722                                 dskb = skb_peek(&csk->receive_queue);
1723                                 if (!dskb) {
1724                                         pr_err("csk 0x%p, skb 0x%p,%u, f 0x%lx,"
1725                                                 " plen %u, NO data.\n",
1726                                                 csk, skb, skb->len,
1727                                                 cxgbi_skcb_flags(skb),
1728                                                 cxgbi_skcb_rx_pdulen(skb));
1729                                         err = -EIO;
1730                                         goto skb_done;
1731                                 }
1732                                 __skb_unlink(dskb, &csk->receive_queue);
1733
1734                                 err = skb_read_pdu_data(conn, skb, dskb, 0);
1735                                 if (err < 0)
1736                                         pr_err("data, csk 0x%p, skb 0x%p,%u, "
1737                                                 "f 0x%lx, plen %u, dskb 0x%p,"
1738                                                 "%u.\n",
1739                                                 csk, skb, skb->len,
1740                                                 cxgbi_skcb_flags(skb),
1741                                                 cxgbi_skcb_rx_pdulen(skb),
1742                                                 dskb, dskb->len);
1743                                 __kfree_skb(dskb);
1744                         } else
1745                                 err = skb_read_pdu_data(conn, skb, skb, 0);
1746                 }
1747 skb_done:
1748                 __kfree_skb(skb);
1749
1750                 if (err < 0)
1751                         break;
1752         }
1753
1754         log_debug(1 << CXGBI_DBG_PDU_RX, "csk 0x%p, read %u.\n", csk, read);
1755         if (read) {
1756                 csk->copied_seq += read;
1757                 csk_return_rx_credits(csk, read);
1758                 conn->rxdata_octets += read;
1759         }
1760
1761         if (err < 0) {
1762                 pr_info("csk 0x%p, 0x%p, rx failed %d, read %u.\n",
1763                         csk, conn, err, read);
1764                 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1765         }
1766 }
1767 EXPORT_SYMBOL_GPL(cxgbi_conn_pdu_ready);
1768
1769 static int sgl_seek_offset(struct scatterlist *sgl, unsigned int sgcnt,
1770                                 unsigned int offset, unsigned int *off,
1771                                 struct scatterlist **sgp)
1772 {
1773         int i;
1774         struct scatterlist *sg;
1775
1776         for_each_sg(sgl, sg, sgcnt, i) {
1777                 if (offset < sg->length) {
1778                         *off = offset;
1779                         *sgp = sg;
1780                         return 0;
1781                 }
1782                 offset -= sg->length;
1783         }
1784         return -EFAULT;
1785 }
1786
1787 static int sgl_read_to_frags(struct scatterlist *sg, unsigned int sgoffset,
1788                                 unsigned int dlen, skb_frag_t *frags,
1789                                 int frag_max)
1790 {
1791         unsigned int datalen = dlen;
1792         unsigned int sglen = sg->length - sgoffset;
1793         struct page *page = sg_page(sg);
1794         int i;
1795
1796         i = 0;
1797         do {
1798                 unsigned int copy;
1799
1800                 if (!sglen) {
1801                         sg = sg_next(sg);
1802                         if (!sg) {
1803                                 pr_warn("sg %d NULL, len %u/%u.\n",
1804                                         i, datalen, dlen);
1805                                 return -EINVAL;
1806                         }
1807                         sgoffset = 0;
1808                         sglen = sg->length;
1809                         page = sg_page(sg);
1810
1811                 }
1812                 copy = min(datalen, sglen);
1813                 if (i && page == frags[i - 1].page &&
1814                     sgoffset + sg->offset ==
1815                         frags[i - 1].page_offset + frags[i - 1].size) {
1816                         frags[i - 1].size += copy;
1817                 } else {
1818                         if (i >= frag_max) {
1819                                 pr_warn("too many pages %u, dlen %u.\n",
1820                                         frag_max, dlen);
1821                                 return -EINVAL;
1822                         }
1823
1824                         frags[i].page = page;
1825                         frags[i].page_offset = sg->offset + sgoffset;
1826                         frags[i].size = copy;
1827                         i++;
1828                 }
1829                 datalen -= copy;
1830                 sgoffset += copy;
1831                 sglen -= copy;
1832         } while (datalen);
1833
1834         return i;
1835 }
1836
1837 int cxgbi_conn_alloc_pdu(struct iscsi_task *task, u8 opcode)
1838 {
1839         struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
1840         struct cxgbi_conn *cconn = tcp_conn->dd_data;
1841         struct cxgbi_device *cdev = cconn->chba->cdev;
1842         struct iscsi_conn *conn = task->conn;
1843         struct iscsi_tcp_task *tcp_task = task->dd_data;
1844         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1845         struct scsi_cmnd *sc = task->sc;
1846         int headroom = SKB_TX_ISCSI_PDU_HEADER_MAX;
1847
1848         tcp_task->dd_data = tdata;
1849         task->hdr = NULL;
1850
1851         if (SKB_MAX_HEAD(cdev->skb_tx_rsvd) > (512 * MAX_SKB_FRAGS) &&
1852             (opcode == ISCSI_OP_SCSI_DATA_OUT ||
1853              (opcode == ISCSI_OP_SCSI_CMD &&
1854               (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_TO_DEVICE))))
1855                 /* data could goes into skb head */
1856                 headroom += min_t(unsigned int,
1857                                 SKB_MAX_HEAD(cdev->skb_tx_rsvd),
1858                                 conn->max_xmit_dlength);
1859
1860         tdata->skb = alloc_skb(cdev->skb_tx_rsvd + headroom, GFP_ATOMIC);
1861         if (!tdata->skb) {
1862                 pr_warn("alloc skb %u+%u, opcode 0x%x failed.\n",
1863                         cdev->skb_tx_rsvd, headroom, opcode);
1864                 return -ENOMEM;
1865         }
1866
1867         skb_reserve(tdata->skb, cdev->skb_tx_rsvd);
1868         task->hdr = (struct iscsi_hdr *)tdata->skb->data;
1869         task->hdr_max = SKB_TX_ISCSI_PDU_HEADER_MAX; /* BHS + AHS */
1870
1871         /* data_out uses scsi_cmd's itt */
1872         if (opcode != ISCSI_OP_SCSI_DATA_OUT)
1873                 task_reserve_itt(task, &task->hdr->itt);
1874
1875         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
1876                 "task 0x%p, op 0x%x, skb 0x%p,%u+%u/%u, itt 0x%x.\n",
1877                 task, opcode, tdata->skb, cdev->skb_tx_rsvd, headroom,
1878                 conn->max_xmit_dlength, ntohl(task->hdr->itt));
1879
1880         return 0;
1881 }
1882 EXPORT_SYMBOL_GPL(cxgbi_conn_alloc_pdu);
1883
1884 static inline void tx_skb_setmode(struct sk_buff *skb, int hcrc, int dcrc)
1885 {
1886         if (hcrc || dcrc) {
1887                 u8 submode = 0;
1888
1889                 if (hcrc)
1890                         submode |= 1;
1891                 if (dcrc)
1892                         submode |= 2;
1893                 cxgbi_skcb_ulp_mode(skb) = (ULP2_MODE_ISCSI << 4) | submode;
1894         } else
1895                 cxgbi_skcb_ulp_mode(skb) = 0;
1896 }
1897
1898 int cxgbi_conn_init_pdu(struct iscsi_task *task, unsigned int offset,
1899                               unsigned int count)
1900 {
1901         struct iscsi_conn *conn = task->conn;
1902         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1903         struct sk_buff *skb = tdata->skb;
1904         unsigned int datalen = count;
1905         int i, padlen = iscsi_padding(count);
1906         struct page *pg;
1907
1908         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
1909                 "task 0x%p,0x%p, skb 0x%p, 0x%x,0x%x,0x%x, %u+%u.\n",
1910                 task, task->sc, skb, (*skb->data) & ISCSI_OPCODE_MASK,
1911                 ntohl(task->cmdsn), ntohl(task->hdr->itt), offset, count);
1912
1913         skb_put(skb, task->hdr_len);
1914         tx_skb_setmode(skb, conn->hdrdgst_en, datalen ? conn->datadgst_en : 0);
1915         if (!count)
1916                 return 0;
1917
1918         if (task->sc) {
1919                 struct scsi_data_buffer *sdb = scsi_out(task->sc);
1920                 struct scatterlist *sg = NULL;
1921                 int err;
1922
1923                 tdata->offset = offset;
1924                 tdata->count = count;
1925                 err = sgl_seek_offset(
1926                                         sdb->table.sgl, sdb->table.nents,
1927                                         tdata->offset, &tdata->sgoffset, &sg);
1928                 if (err < 0) {
1929                         pr_warn("tpdu, sgl %u, bad offset %u/%u.\n",
1930                                 sdb->table.nents, tdata->offset, sdb->length);
1931                         return err;
1932                 }
1933                 err = sgl_read_to_frags(sg, tdata->sgoffset, tdata->count,
1934                                         tdata->frags, MAX_PDU_FRAGS);
1935                 if (err < 0) {
1936                         pr_warn("tpdu, sgl %u, bad offset %u + %u.\n",
1937                                 sdb->table.nents, tdata->offset, tdata->count);
1938                         return err;
1939                 }
1940                 tdata->nr_frags = err;
1941
1942                 if (tdata->nr_frags > MAX_SKB_FRAGS ||
1943                     (padlen && tdata->nr_frags == MAX_SKB_FRAGS)) {
1944                         char *dst = skb->data + task->hdr_len;
1945                         skb_frag_t *frag = tdata->frags;
1946
1947                         /* data fits in the skb's headroom */
1948                         for (i = 0; i < tdata->nr_frags; i++, frag++) {
1949                                 char *src = kmap_atomic(frag->page,
1950                                                         KM_SOFTIRQ0);
1951
1952                                 memcpy(dst, src+frag->page_offset, frag->size);
1953                                 dst += frag->size;
1954                                 kunmap_atomic(src, KM_SOFTIRQ0);
1955                         }
1956                         if (padlen) {
1957                                 memset(dst, 0, padlen);
1958                                 padlen = 0;
1959                         }
1960                         skb_put(skb, count + padlen);
1961                 } else {
1962                         /* data fit into frag_list */
1963                         for (i = 0; i < tdata->nr_frags; i++)
1964                                 get_page(tdata->frags[i].page);
1965
1966                         memcpy(skb_shinfo(skb)->frags, tdata->frags,
1967                                 sizeof(skb_frag_t) * tdata->nr_frags);
1968                         skb_shinfo(skb)->nr_frags = tdata->nr_frags;
1969                         skb->len += count;
1970                         skb->data_len += count;
1971                         skb->truesize += count;
1972                 }
1973
1974         } else {
1975                 pg = virt_to_page(task->data);
1976
1977                 get_page(pg);
1978                 skb_fill_page_desc(skb, 0, pg, offset_in_page(task->data),
1979                                         count);
1980                 skb->len += count;
1981                 skb->data_len += count;
1982                 skb->truesize += count;
1983         }
1984
1985         if (padlen) {
1986                 i = skb_shinfo(skb)->nr_frags;
1987                 skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags,
1988                                 virt_to_page(padding), offset_in_page(padding),
1989                                 padlen);
1990
1991                 skb->data_len += padlen;
1992                 skb->truesize += padlen;
1993                 skb->len += padlen;
1994         }
1995
1996         return 0;
1997 }
1998 EXPORT_SYMBOL_GPL(cxgbi_conn_init_pdu);
1999
2000 int cxgbi_conn_xmit_pdu(struct iscsi_task *task)
2001 {
2002         struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
2003         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2004         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2005         struct sk_buff *skb = tdata->skb;
2006         unsigned int datalen;
2007         int err;
2008
2009         if (!skb) {
2010                 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2011                         "task 0x%p, skb NULL.\n", task);
2012                 return 0;
2013         }
2014
2015         datalen = skb->data_len;
2016         tdata->skb = NULL;
2017         err = cxgbi_sock_send_pdus(cconn->cep->csk, skb);
2018         if (err > 0) {
2019                 int pdulen = err;
2020
2021                 log_debug(1 << CXGBI_DBG_PDU_TX,
2022                         "task 0x%p,0x%p, skb 0x%p, len %u/%u, rv %d.\n",
2023                         task, task->sc, skb, skb->len, skb->data_len, err);
2024
2025                 if (task->conn->hdrdgst_en)
2026                         pdulen += ISCSI_DIGEST_SIZE;
2027
2028                 if (datalen && task->conn->datadgst_en)
2029                         pdulen += ISCSI_DIGEST_SIZE;
2030
2031                 task->conn->txdata_octets += pdulen;
2032                 return 0;
2033         }
2034
2035         if (err == -EAGAIN || err == -ENOBUFS) {
2036                 log_debug(1 << CXGBI_DBG_PDU_TX,
2037                         "task 0x%p, skb 0x%p, len %u/%u, %d EAGAIN.\n",
2038                         task, skb, skb->len, skb->data_len, err);
2039                 /* reset skb to send when we are called again */
2040                 tdata->skb = skb;
2041                 return err;
2042         }
2043
2044         kfree_skb(skb);
2045         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2046                 "itt 0x%x, skb 0x%p, len %u/%u, xmit err %d.\n",
2047                 task->itt, skb, skb->len, skb->data_len, err);
2048         iscsi_conn_printk(KERN_ERR, task->conn, "xmit err %d.\n", err);
2049         iscsi_conn_failure(task->conn, ISCSI_ERR_XMIT_FAILED);
2050         return err;
2051 }
2052 EXPORT_SYMBOL_GPL(cxgbi_conn_xmit_pdu);
2053
2054 void cxgbi_cleanup_task(struct iscsi_task *task)
2055 {
2056         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2057
2058         log_debug(1 << CXGBI_DBG_ISCSI,
2059                 "task 0x%p, skb 0x%p, itt 0x%x.\n",
2060                 task, tdata->skb, task->hdr_itt);
2061
2062         /*  never reached the xmit task callout */
2063         if (tdata->skb)
2064                 __kfree_skb(tdata->skb);
2065         memset(tdata, 0, sizeof(*tdata));
2066
2067         task_release_itt(task, task->hdr_itt);
2068         iscsi_tcp_cleanup_task(task);
2069 }
2070 EXPORT_SYMBOL_GPL(cxgbi_cleanup_task);
2071
2072 void cxgbi_get_conn_stats(struct iscsi_cls_conn *cls_conn,
2073                                 struct iscsi_stats *stats)
2074 {
2075         struct iscsi_conn *conn = cls_conn->dd_data;
2076
2077         stats->txdata_octets = conn->txdata_octets;
2078         stats->rxdata_octets = conn->rxdata_octets;
2079         stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
2080         stats->dataout_pdus = conn->dataout_pdus_cnt;
2081         stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
2082         stats->datain_pdus = conn->datain_pdus_cnt;
2083         stats->r2t_pdus = conn->r2t_pdus_cnt;
2084         stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
2085         stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
2086         stats->digest_err = 0;
2087         stats->timeout_err = 0;
2088         stats->custom_length = 1;
2089         strcpy(stats->custom[0].desc, "eh_abort_cnt");
2090         stats->custom[0].value = conn->eh_abort_cnt;
2091 }
2092 EXPORT_SYMBOL_GPL(cxgbi_get_conn_stats);
2093
2094 static int cxgbi_conn_max_xmit_dlength(struct iscsi_conn *conn)
2095 {
2096         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2097         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2098         struct cxgbi_device *cdev = cconn->chba->cdev;
2099         unsigned int headroom = SKB_MAX_HEAD(cdev->skb_tx_rsvd);
2100         unsigned int max_def = 512 * MAX_SKB_FRAGS;
2101         unsigned int max = max(max_def, headroom);
2102
2103         max = min(cconn->chba->cdev->tx_max_size, max);
2104         if (conn->max_xmit_dlength)
2105                 conn->max_xmit_dlength = min(conn->max_xmit_dlength, max);
2106         else
2107                 conn->max_xmit_dlength = max;
2108         cxgbi_align_pdu_size(conn->max_xmit_dlength);
2109
2110         return 0;
2111 }
2112
2113 static int cxgbi_conn_max_recv_dlength(struct iscsi_conn *conn)
2114 {
2115         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2116         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2117         unsigned int max = cconn->chba->cdev->rx_max_size;
2118
2119         cxgbi_align_pdu_size(max);
2120
2121         if (conn->max_recv_dlength) {
2122                 if (conn->max_recv_dlength > max) {
2123                         pr_err("MaxRecvDataSegmentLength %u > %u.\n",
2124                                 conn->max_recv_dlength, max);
2125                         return -EINVAL;
2126                 }
2127                 conn->max_recv_dlength = min(conn->max_recv_dlength, max);
2128                 cxgbi_align_pdu_size(conn->max_recv_dlength);
2129         } else
2130                 conn->max_recv_dlength = max;
2131
2132         return 0;
2133 }
2134
2135 int cxgbi_set_conn_param(struct iscsi_cls_conn *cls_conn,
2136                         enum iscsi_param param, char *buf, int buflen)
2137 {
2138         struct iscsi_conn *conn = cls_conn->dd_data;
2139         struct iscsi_session *session = conn->session;
2140         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2141         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2142         struct cxgbi_sock *csk = cconn->cep->csk;
2143         int value, err = 0;
2144
2145         log_debug(1 << CXGBI_DBG_ISCSI,
2146                 "cls_conn 0x%p, param %d, buf(%d) %s.\n",
2147                 cls_conn, param, buflen, buf);
2148
2149         switch (param) {
2150         case ISCSI_PARAM_HDRDGST_EN:
2151                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2152                 if (!err && conn->hdrdgst_en)
2153                         err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2154                                                         conn->hdrdgst_en,
2155                                                         conn->datadgst_en, 0);
2156                 break;
2157         case ISCSI_PARAM_DATADGST_EN:
2158                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2159                 if (!err && conn->datadgst_en)
2160                         err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2161                                                         conn->hdrdgst_en,
2162                                                         conn->datadgst_en, 0);
2163                 break;
2164         case ISCSI_PARAM_MAX_R2T:
2165                 sscanf(buf, "%d", &value);
2166                 if (value <= 0 || !is_power_of_2(value))
2167                         return -EINVAL;
2168                 if (session->max_r2t == value)
2169                         break;
2170                 iscsi_tcp_r2tpool_free(session);
2171                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2172                 if (!err && iscsi_tcp_r2tpool_alloc(session))
2173                         return -ENOMEM;
2174         case ISCSI_PARAM_MAX_RECV_DLENGTH:
2175                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2176                 if (!err)
2177                         err = cxgbi_conn_max_recv_dlength(conn);
2178                 break;
2179         case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2180                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2181                 if (!err)
2182                         err = cxgbi_conn_max_xmit_dlength(conn);
2183                 break;
2184         default:
2185                 return iscsi_set_param(cls_conn, param, buf, buflen);
2186         }
2187         return err;
2188 }
2189 EXPORT_SYMBOL_GPL(cxgbi_set_conn_param);
2190
2191 int cxgbi_get_ep_param(struct iscsi_endpoint *ep, enum iscsi_param param,
2192                        char *buf)
2193 {
2194         struct cxgbi_endpoint *cep = ep->dd_data;
2195         struct cxgbi_sock *csk;
2196         int len;
2197
2198         log_debug(1 << CXGBI_DBG_ISCSI,
2199                 "cls_conn 0x%p, param %d.\n", ep, param);
2200
2201         switch (param) {
2202         case ISCSI_PARAM_CONN_PORT:
2203         case ISCSI_PARAM_CONN_ADDRESS:
2204                 if (!cep)
2205                         return -ENOTCONN;
2206
2207                 csk = cep->csk;
2208                 if (!csk)
2209                         return -ENOTCONN;
2210
2211                 return iscsi_conn_get_addr_param((struct sockaddr_storage *)
2212                                                  &csk->daddr, param, buf);
2213         default:
2214                 return -ENOSYS;
2215         }
2216         return len;
2217 }
2218 EXPORT_SYMBOL_GPL(cxgbi_get_ep_param);
2219
2220 struct iscsi_cls_conn *
2221 cxgbi_create_conn(struct iscsi_cls_session *cls_session, u32 cid)
2222 {
2223         struct iscsi_cls_conn *cls_conn;
2224         struct iscsi_conn *conn;
2225         struct iscsi_tcp_conn *tcp_conn;
2226         struct cxgbi_conn *cconn;
2227
2228         cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*cconn), cid);
2229         if (!cls_conn)
2230                 return NULL;
2231
2232         conn = cls_conn->dd_data;
2233         tcp_conn = conn->dd_data;
2234         cconn = tcp_conn->dd_data;
2235         cconn->iconn = conn;
2236
2237         log_debug(1 << CXGBI_DBG_ISCSI,
2238                 "cid %u(0x%x), cls 0x%p,0x%p, conn 0x%p,0x%p,0x%p.\n",
2239                 cid, cid, cls_session, cls_conn, conn, tcp_conn, cconn);
2240
2241         return cls_conn;
2242 }
2243 EXPORT_SYMBOL_GPL(cxgbi_create_conn);
2244
2245 int cxgbi_bind_conn(struct iscsi_cls_session *cls_session,
2246                                 struct iscsi_cls_conn *cls_conn,
2247                                 u64 transport_eph, int is_leading)
2248 {
2249         struct iscsi_conn *conn = cls_conn->dd_data;
2250         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2251         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2252         struct iscsi_endpoint *ep;
2253         struct cxgbi_endpoint *cep;
2254         struct cxgbi_sock *csk;
2255         int err;
2256
2257         ep = iscsi_lookup_endpoint(transport_eph);
2258         if (!ep)
2259                 return -EINVAL;
2260
2261         /*  setup ddp pagesize */
2262         cep = ep->dd_data;
2263         csk = cep->csk;
2264         err = csk->cdev->csk_ddp_setup_pgidx(csk, csk->tid, page_idx, 0);
2265         if (err < 0)
2266                 return err;
2267
2268         err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
2269         if (err)
2270                 return -EINVAL;
2271
2272         /*  calculate the tag idx bits needed for this conn based on cmds_max */
2273         cconn->task_idx_bits = (__ilog2_u32(conn->session->cmds_max - 1)) + 1;
2274
2275         write_lock_bh(&csk->callback_lock);
2276         csk->user_data = conn;
2277         cconn->chba = cep->chba;
2278         cconn->cep = cep;
2279         cep->cconn = cconn;
2280         write_unlock_bh(&csk->callback_lock);
2281
2282         cxgbi_conn_max_xmit_dlength(conn);
2283         cxgbi_conn_max_recv_dlength(conn);
2284
2285         log_debug(1 << CXGBI_DBG_ISCSI,
2286                 "cls 0x%p,0x%p, ep 0x%p, cconn 0x%p, csk 0x%p.\n",
2287                 cls_session, cls_conn, ep, cconn, csk);
2288         /*  init recv engine */
2289         iscsi_tcp_hdr_recv_prep(tcp_conn);
2290
2291         return 0;
2292 }
2293 EXPORT_SYMBOL_GPL(cxgbi_bind_conn);
2294
2295 struct iscsi_cls_session *cxgbi_create_session(struct iscsi_endpoint *ep,
2296                                                 u16 cmds_max, u16 qdepth,
2297                                                 u32 initial_cmdsn)
2298 {
2299         struct cxgbi_endpoint *cep;
2300         struct cxgbi_hba *chba;
2301         struct Scsi_Host *shost;
2302         struct iscsi_cls_session *cls_session;
2303         struct iscsi_session *session;
2304
2305         if (!ep) {
2306                 pr_err("missing endpoint.\n");
2307                 return NULL;
2308         }
2309
2310         cep = ep->dd_data;
2311         chba = cep->chba;
2312         shost = chba->shost;
2313
2314         BUG_ON(chba != iscsi_host_priv(shost));
2315
2316         cls_session = iscsi_session_setup(chba->cdev->itp, shost,
2317                                         cmds_max, 0,
2318                                         sizeof(struct iscsi_tcp_task) +
2319                                         sizeof(struct cxgbi_task_data),
2320                                         initial_cmdsn, ISCSI_MAX_TARGET);
2321         if (!cls_session)
2322                 return NULL;
2323
2324         session = cls_session->dd_data;
2325         if (iscsi_tcp_r2tpool_alloc(session))
2326                 goto remove_session;
2327
2328         log_debug(1 << CXGBI_DBG_ISCSI,
2329                 "ep 0x%p, cls sess 0x%p.\n", ep, cls_session);
2330         return cls_session;
2331
2332 remove_session:
2333         iscsi_session_teardown(cls_session);
2334         return NULL;
2335 }
2336 EXPORT_SYMBOL_GPL(cxgbi_create_session);
2337
2338 void cxgbi_destroy_session(struct iscsi_cls_session *cls_session)
2339 {
2340         log_debug(1 << CXGBI_DBG_ISCSI,
2341                 "cls sess 0x%p.\n", cls_session);
2342
2343         iscsi_tcp_r2tpool_free(cls_session->dd_data);
2344         iscsi_session_teardown(cls_session);
2345 }
2346 EXPORT_SYMBOL_GPL(cxgbi_destroy_session);
2347
2348 int cxgbi_set_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2349                         char *buf, int buflen)
2350 {
2351         struct cxgbi_hba *chba = iscsi_host_priv(shost);
2352
2353         if (!chba->ndev) {
2354                 shost_printk(KERN_ERR, shost, "Could not get host param. "
2355                                 "netdev for host not set.\n");
2356                 return -ENODEV;
2357         }
2358
2359         log_debug(1 << CXGBI_DBG_ISCSI,
2360                 "shost 0x%p, hba 0x%p,%s, param %d, buf(%d) %s.\n",
2361                 shost, chba, chba->ndev->name, param, buflen, buf);
2362
2363         switch (param) {
2364         case ISCSI_HOST_PARAM_IPADDRESS:
2365         {
2366                 __be32 addr = in_aton(buf);
2367                 log_debug(1 << CXGBI_DBG_ISCSI,
2368                         "hba %s, req. ipv4 %pI4.\n", chba->ndev->name, &addr);
2369                 cxgbi_set_iscsi_ipv4(chba, addr);
2370                 return 0;
2371         }
2372         case ISCSI_HOST_PARAM_HWADDRESS:
2373         case ISCSI_HOST_PARAM_NETDEV_NAME:
2374                 return 0;
2375         default:
2376                 return iscsi_host_set_param(shost, param, buf, buflen);
2377         }
2378 }
2379 EXPORT_SYMBOL_GPL(cxgbi_set_host_param);
2380
2381 int cxgbi_get_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2382                         char *buf)
2383 {
2384         struct cxgbi_hba *chba = iscsi_host_priv(shost);
2385         int len = 0;
2386
2387         if (!chba->ndev) {
2388                 shost_printk(KERN_ERR, shost, "Could not get host param. "
2389                                 "netdev for host not set.\n");
2390                 return -ENODEV;
2391         }
2392
2393         log_debug(1 << CXGBI_DBG_ISCSI,
2394                 "shost 0x%p, hba 0x%p,%s, param %d.\n",
2395                 shost, chba, chba->ndev->name, param);
2396
2397         switch (param) {
2398         case ISCSI_HOST_PARAM_HWADDRESS:
2399                 len = sysfs_format_mac(buf, chba->ndev->dev_addr, 6);
2400                 break;
2401         case ISCSI_HOST_PARAM_NETDEV_NAME:
2402                 len = sprintf(buf, "%s\n", chba->ndev->name);
2403                 break;
2404         case ISCSI_HOST_PARAM_IPADDRESS:
2405         {
2406                 __be32 addr;
2407
2408                 addr = cxgbi_get_iscsi_ipv4(chba);
2409                 len = sprintf(buf, "%pI4", &addr);
2410                 log_debug(1 << CXGBI_DBG_ISCSI,
2411                         "hba %s, ipv4 %pI4.\n", chba->ndev->name, &addr);
2412                 break;
2413         }
2414         default:
2415                 return iscsi_host_get_param(shost, param, buf);
2416         }
2417
2418         return len;
2419 }
2420 EXPORT_SYMBOL_GPL(cxgbi_get_host_param);
2421
2422 struct iscsi_endpoint *cxgbi_ep_connect(struct Scsi_Host *shost,
2423                                         struct sockaddr *dst_addr,
2424                                         int non_blocking)
2425 {
2426         struct iscsi_endpoint *ep;
2427         struct cxgbi_endpoint *cep;
2428         struct cxgbi_hba *hba = NULL;
2429         struct cxgbi_sock *csk;
2430         int err = -EINVAL;
2431
2432         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2433                 "shost 0x%p, non_blocking %d, dst_addr 0x%p.\n",
2434                 shost, non_blocking, dst_addr);
2435
2436         if (shost) {
2437                 hba = iscsi_host_priv(shost);
2438                 if (!hba) {
2439                         pr_info("shost 0x%p, priv NULL.\n", shost);
2440                         goto err_out;
2441                 }
2442         }
2443
2444         csk = cxgbi_check_route(dst_addr);
2445         if (IS_ERR(csk))
2446                 return (struct iscsi_endpoint *)csk;
2447         cxgbi_sock_get(csk);
2448
2449         if (!hba)
2450                 hba = csk->cdev->hbas[csk->port_id];
2451         else if (hba != csk->cdev->hbas[csk->port_id]) {
2452                 pr_info("Could not connect through requested host %u"
2453                         "hba 0x%p != 0x%p (%u).\n",
2454                         shost->host_no, hba,
2455                         csk->cdev->hbas[csk->port_id], csk->port_id);
2456                 err = -ENOSPC;
2457                 goto release_conn;
2458         }
2459
2460         err = sock_get_port(csk);
2461         if (err)
2462                 goto release_conn;
2463
2464         cxgbi_sock_set_state(csk, CTP_CONNECTING);
2465         err = csk->cdev->csk_init_act_open(csk);
2466         if (err)
2467                 goto release_conn;
2468
2469         if (cxgbi_sock_is_closing(csk)) {
2470                 err = -ENOSPC;
2471                 pr_info("csk 0x%p is closing.\n", csk);
2472                 goto release_conn;
2473         }
2474
2475         ep = iscsi_create_endpoint(sizeof(*cep));
2476         if (!ep) {
2477                 err = -ENOMEM;
2478                 pr_info("iscsi alloc ep, OOM.\n");
2479                 goto release_conn;
2480         }
2481
2482         cep = ep->dd_data;
2483         cep->csk = csk;
2484         cep->chba = hba;
2485
2486         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2487                 "ep 0x%p, cep 0x%p, csk 0x%p, hba 0x%p,%s.\n",
2488                 ep, cep, csk, hba, hba->ndev->name);
2489         return ep;
2490
2491 release_conn:
2492         cxgbi_sock_put(csk);
2493         cxgbi_sock_closed(csk);
2494 err_out:
2495         return ERR_PTR(err);
2496 }
2497 EXPORT_SYMBOL_GPL(cxgbi_ep_connect);
2498
2499 int cxgbi_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
2500 {
2501         struct cxgbi_endpoint *cep = ep->dd_data;
2502         struct cxgbi_sock *csk = cep->csk;
2503
2504         if (!cxgbi_sock_is_established(csk))
2505                 return 0;
2506         return 1;
2507 }
2508 EXPORT_SYMBOL_GPL(cxgbi_ep_poll);
2509
2510 void cxgbi_ep_disconnect(struct iscsi_endpoint *ep)
2511 {
2512         struct cxgbi_endpoint *cep = ep->dd_data;
2513         struct cxgbi_conn *cconn = cep->cconn;
2514         struct cxgbi_sock *csk = cep->csk;
2515
2516         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2517                 "ep 0x%p, cep 0x%p, cconn 0x%p, csk 0x%p,%u,0x%lx.\n",
2518                 ep, cep, cconn, csk, csk->state, csk->flags);
2519
2520         if (cconn && cconn->iconn) {
2521                 iscsi_suspend_tx(cconn->iconn);
2522                 write_lock_bh(&csk->callback_lock);
2523                 cep->csk->user_data = NULL;
2524                 cconn->cep = NULL;
2525                 write_unlock_bh(&csk->callback_lock);
2526         }
2527         iscsi_destroy_endpoint(ep);
2528
2529         if (likely(csk->state >= CTP_ESTABLISHED))
2530                 need_active_close(csk);
2531         else
2532                 cxgbi_sock_closed(csk);
2533
2534         cxgbi_sock_put(csk);
2535 }
2536 EXPORT_SYMBOL_GPL(cxgbi_ep_disconnect);
2537
2538 int cxgbi_iscsi_init(struct iscsi_transport *itp,
2539                         struct scsi_transport_template **stt)
2540 {
2541         *stt = iscsi_register_transport(itp);
2542         if (*stt == NULL) {
2543                 pr_err("unable to register %s transport 0x%p.\n",
2544                         itp->name, itp);
2545                 return -ENODEV;
2546         }
2547         log_debug(1 << CXGBI_DBG_ISCSI,
2548                 "%s, registered iscsi transport 0x%p.\n",
2549                 itp->name, stt);
2550         return 0;
2551 }
2552 EXPORT_SYMBOL_GPL(cxgbi_iscsi_init);
2553
2554 void cxgbi_iscsi_cleanup(struct iscsi_transport *itp,
2555                         struct scsi_transport_template **stt)
2556 {
2557         if (*stt) {
2558                 log_debug(1 << CXGBI_DBG_ISCSI,
2559                         "de-register transport 0x%p, %s, stt 0x%p.\n",
2560                         itp, itp->name, *stt);
2561                 *stt = NULL;
2562                 iscsi_unregister_transport(itp);
2563         }
2564 }
2565 EXPORT_SYMBOL_GPL(cxgbi_iscsi_cleanup);
2566
2567 static int __init libcxgbi_init_module(void)
2568 {
2569         sw_tag_idx_bits = (__ilog2_u32(ISCSI_ITT_MASK)) + 1;
2570         sw_tag_age_bits = (__ilog2_u32(ISCSI_AGE_MASK)) + 1;
2571
2572         pr_info("tag itt 0x%x, %u bits, age 0x%x, %u bits.\n",
2573                 ISCSI_ITT_MASK, sw_tag_idx_bits,
2574                 ISCSI_AGE_MASK, sw_tag_age_bits);
2575
2576         ddp_setup_host_page_size();
2577         return 0;
2578 }
2579
2580 static void __exit libcxgbi_exit_module(void)
2581 {
2582         cxgbi_device_unregister_all(0xFF);
2583         return;
2584 }
2585
2586 module_init(libcxgbi_init_module);
2587 module_exit(libcxgbi_exit_module);