drivers/scsi/cxgbi/libcxgbi.c

   1 /*
   2  * libcxgbi.c: Chelsio common library for T3/T4 iSCSI driver.
   3  *
   4  * Copyright (c) 2010-2015 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 <net/ipv6.h>
  28 #include <net/ip6_route.h>
  29 #include <net/addrconf.h>
  30
  31 #include <linux/inetdevice.h>   /* ip_dev_find */
  32 #include <linux/module.h>
  33 #include <net/tcp.h>
  34
  35 static unsigned int dbg_level;
  36
  37 #include "libcxgbi.h"
  38
  39 #define DRV_MODULE_NAME         "libcxgbi"
  40 #define DRV_MODULE_DESC         "Chelsio iSCSI driver library"
  41 #define DRV_MODULE_VERSION      "0.9.1-ko"
  42 #define DRV_MODULE_RELDATE      "Apr. 2015"
  43
  44 static char version[] =
  45         DRV_MODULE_DESC " " DRV_MODULE_NAME
  46         " v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
  47
  48 MODULE_AUTHOR("Chelsio Communications, Inc.");
  49 MODULE_DESCRIPTION(DRV_MODULE_DESC);
  50 MODULE_VERSION(DRV_MODULE_VERSION);
  51 MODULE_LICENSE("GPL");
  52
  53 module_param(dbg_level, uint, 0644);
  54 MODULE_PARM_DESC(dbg_level, "libiscsi debug level (default=0)");
  55
  56
  57 /*
  58  * cxgbi device management
  59  * maintains a list of the cxgbi devices
  60  */
  61 static LIST_HEAD(cdev_list);
  62 static DEFINE_MUTEX(cdev_mutex);
  63
  64 static LIST_HEAD(cdev_rcu_list);
  65 static DEFINE_SPINLOCK(cdev_rcu_lock);
  66
  67 static inline void cxgbi_decode_sw_tag(u32 sw_tag, int *idx, int *age)
  68 {
  69         if (age)
  70                 *age = sw_tag & 0x7FFF;
  71         if (idx)
  72                 *idx = (sw_tag >> 16) & 0x7FFF;
  73 }
  74
  75 int cxgbi_device_portmap_create(struct cxgbi_device *cdev, unsigned int base,
  76                                 unsigned int max_conn)
  77 {
  78         struct cxgbi_ports_map *pmap = &cdev->pmap;
  79
  80         pmap->port_csk = cxgbi_alloc_big_mem(max_conn *
  81                                              sizeof(struct cxgbi_sock *),
  82                                              GFP_KERNEL);
  83         if (!pmap->port_csk) {
  84                 pr_warn("cdev 0x%p, portmap OOM %u.\n", cdev, max_conn);
  85                 return -ENOMEM;
  86         }
  87
  88         pmap->max_connect = max_conn;
  89         pmap->sport_base = base;
  90         spin_lock_init(&pmap->lock);
  91         return 0;
  92 }
  93 EXPORT_SYMBOL_GPL(cxgbi_device_portmap_create);
  94
  95 void cxgbi_device_portmap_cleanup(struct cxgbi_device *cdev)
  96 {
  97         struct cxgbi_ports_map *pmap = &cdev->pmap;
  98         struct cxgbi_sock *csk;
  99         int i;
 100
 101         for (i = 0; i < pmap->max_connect; i++) {
 102                 if (pmap->port_csk[i]) {
 103                         csk = pmap->port_csk[i];
 104                         pmap->port_csk[i] = NULL;
 105                         log_debug(1 << CXGBI_DBG_SOCK,
 106                                 "csk 0x%p, cdev 0x%p, offload down.\n",
 107                                 csk, cdev);
 108                         spin_lock_bh(&csk->lock);
 109                         cxgbi_sock_set_flag(csk, CTPF_OFFLOAD_DOWN);
 110                         cxgbi_sock_closed(csk);
 111                         spin_unlock_bh(&csk->lock);
 112                         cxgbi_sock_put(csk);
 113                 }
 114         }
 115 }
 116 EXPORT_SYMBOL_GPL(cxgbi_device_portmap_cleanup);
 117
 118 static inline void cxgbi_device_destroy(struct cxgbi_device *cdev)
 119 {
 120         log_debug(1 << CXGBI_DBG_DEV,
 121                 "cdev 0x%p, p# %u.\n", cdev, cdev->nports);
 122         cxgbi_hbas_remove(cdev);
 123         cxgbi_device_portmap_cleanup(cdev);
 124         cxgbi_ppm_release(cdev->cdev2ppm(cdev));
 125         if (cdev->pmap.max_connect)
 126                 cxgbi_free_big_mem(cdev->pmap.port_csk);
 127         kfree(cdev);
 128 }
 129
 130 struct cxgbi_device *cxgbi_device_register(unsigned int extra,
 131                                            unsigned int nports)
 132 {
 133         struct cxgbi_device *cdev;
 134
 135         cdev = kzalloc(sizeof(*cdev) + extra + nports *
 136                         (sizeof(struct cxgbi_hba *) +
 137                          sizeof(struct net_device *)),
 138                         GFP_KERNEL);
 139         if (!cdev) {
 140                 pr_warn("nport %d, OOM.\n", nports);
 141                 return NULL;
 142         }
 143         cdev->ports = (struct net_device **)(cdev + 1);
 144         cdev->hbas = (struct cxgbi_hba **)(((char*)cdev->ports) + nports *
 145                                                 sizeof(struct net_device *));
 146         if (extra)
 147                 cdev->dd_data = ((char *)cdev->hbas) +
 148                                 nports * sizeof(struct cxgbi_hba *);
 149         spin_lock_init(&cdev->pmap.lock);
 150
 151         mutex_lock(&cdev_mutex);
 152         list_add_tail(&cdev->list_head, &cdev_list);
 153         mutex_unlock(&cdev_mutex);
 154
 155         spin_lock(&cdev_rcu_lock);
 156         list_add_tail_rcu(&cdev->rcu_node, &cdev_rcu_list);
 157         spin_unlock(&cdev_rcu_lock);
 158
 159         log_debug(1 << CXGBI_DBG_DEV,
 160                 "cdev 0x%p, p# %u.\n", cdev, nports);
 161         return cdev;
 162 }
 163 EXPORT_SYMBOL_GPL(cxgbi_device_register);
 164
 165 void cxgbi_device_unregister(struct cxgbi_device *cdev)
 166 {
 167         log_debug(1 << CXGBI_DBG_DEV,
 168                 "cdev 0x%p, p# %u,%s.\n",
 169                 cdev, cdev->nports, cdev->nports ? cdev->ports[0]->name : "");
 170
 171         mutex_lock(&cdev_mutex);
 172         list_del(&cdev->list_head);
 173         mutex_unlock(&cdev_mutex);
 174
 175         spin_lock(&cdev_rcu_lock);
 176         list_del_rcu(&cdev->rcu_node);
 177         spin_unlock(&cdev_rcu_lock);
 178         synchronize_rcu();
 179
 180         cxgbi_device_destroy(cdev);
 181 }
 182 EXPORT_SYMBOL_GPL(cxgbi_device_unregister);
 183
 184 void cxgbi_device_unregister_all(unsigned int flag)
 185 {
 186         struct cxgbi_device *cdev, *tmp;
 187
 188         mutex_lock(&cdev_mutex);
 189         list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
 190                 if ((cdev->flags & flag) == flag) {
 191                         mutex_unlock(&cdev_mutex);
 192                         cxgbi_device_unregister(cdev);
 193                         mutex_lock(&cdev_mutex);
 194                 }
 195         }
 196         mutex_unlock(&cdev_mutex);
 197 }
 198 EXPORT_SYMBOL_GPL(cxgbi_device_unregister_all);
 199
 200 struct cxgbi_device *cxgbi_device_find_by_lldev(void *lldev)
 201 {
 202         struct cxgbi_device *cdev, *tmp;
 203
 204         mutex_lock(&cdev_mutex);
 205         list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
 206                 if (cdev->lldev == lldev) {
 207                         mutex_unlock(&cdev_mutex);
 208                         return cdev;
 209                 }
 210         }
 211         mutex_unlock(&cdev_mutex);
 212
 213         log_debug(1 << CXGBI_DBG_DEV,
 214                 "lldev 0x%p, NO match found.\n", lldev);
 215         return NULL;
 216 }
 217 EXPORT_SYMBOL_GPL(cxgbi_device_find_by_lldev);
 218
 219 struct cxgbi_device *cxgbi_device_find_by_netdev(struct net_device *ndev,
 220                                                  int *port)
 221 {
 222         struct net_device *vdev = NULL;
 223         struct cxgbi_device *cdev, *tmp;
 224         int i;
 225
 226         if (is_vlan_dev(ndev)) {
 227                 vdev = ndev;
 228                 ndev = vlan_dev_real_dev(ndev);
 229                 log_debug(1 << CXGBI_DBG_DEV,
 230                         "vlan dev %s -> %s.\n", vdev->name, ndev->name);
 231         }
 232
 233         mutex_lock(&cdev_mutex);
 234         list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
 235                 for (i = 0; i < cdev->nports; i++) {
 236                         if (ndev == cdev->ports[i]) {
 237                                 cdev->hbas[i]->vdev = vdev;
 238                                 mutex_unlock(&cdev_mutex);
 239                                 if (port)
 240                                         *port = i;
 241                                 return cdev;
 242                         }
 243                 }
 244         }
 245         mutex_unlock(&cdev_mutex);
 246         log_debug(1 << CXGBI_DBG_DEV,
 247                 "ndev 0x%p, %s, NO match found.\n", ndev, ndev->name);
 248         return NULL;
 249 }
 250 EXPORT_SYMBOL_GPL(cxgbi_device_find_by_netdev);
 251
 252 struct cxgbi_device *cxgbi_device_find_by_netdev_rcu(struct net_device *ndev,
 253                                                      int *port)
 254 {
 255         struct net_device *vdev = NULL;
 256         struct cxgbi_device *cdev;
 257         int i;
 258
 259         if (is_vlan_dev(ndev)) {
 260                 vdev = ndev;
 261                 ndev = vlan_dev_real_dev(ndev);
 262                 pr_info("vlan dev %s -> %s.\n", vdev->name, ndev->name);
 263         }
 264
 265         rcu_read_lock();
 266         list_for_each_entry_rcu(cdev, &cdev_rcu_list, rcu_node) {
 267                 for (i = 0; i < cdev->nports; i++) {
 268                         if (ndev == cdev->ports[i]) {
 269                                 cdev->hbas[i]->vdev = vdev;
 270                                 rcu_read_unlock();
 271                                 if (port)
 272                                         *port = i;
 273                                 return cdev;
 274                         }
 275                 }
 276         }
 277         rcu_read_unlock();
 278
 279         log_debug(1 << CXGBI_DBG_DEV,
 280                   "ndev 0x%p, %s, NO match found.\n", ndev, ndev->name);
 281         return NULL;
 282 }
 283 EXPORT_SYMBOL_GPL(cxgbi_device_find_by_netdev_rcu);
 284
 285 #if IS_ENABLED(CONFIG_IPV6)
 286 static struct cxgbi_device *cxgbi_device_find_by_mac(struct net_device *ndev,
 287                                                      int *port)
 288 {
 289         struct net_device *vdev = NULL;
 290         struct cxgbi_device *cdev, *tmp;
 291         int i;
 292
 293         if (is_vlan_dev(ndev)) {
 294                 vdev = ndev;
 295                 ndev = vlan_dev_real_dev(ndev);
 296                 pr_info("vlan dev %s -> %s.\n", vdev->name, ndev->name);
 297         }
 298
 299         mutex_lock(&cdev_mutex);
 300         list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
 301                 for (i = 0; i < cdev->nports; i++) {
 302                         if (!memcmp(ndev->dev_addr, cdev->ports[i]->dev_addr,
 303                                     MAX_ADDR_LEN)) {
 304                                 cdev->hbas[i]->vdev = vdev;
 305                                 mutex_unlock(&cdev_mutex);
 306                                 if (port)
 307                                         *port = i;
 308                                 return cdev;
 309                         }
 310                 }
 311         }
 312         mutex_unlock(&cdev_mutex);
 313         log_debug(1 << CXGBI_DBG_DEV,
 314                   "ndev 0x%p, %s, NO match mac found.\n",
 315                   ndev, ndev->name);
 316         return NULL;
 317 }
 318 #endif
 319
 320 void cxgbi_hbas_remove(struct cxgbi_device *cdev)
 321 {
 322         int i;
 323         struct cxgbi_hba *chba;
 324
 325         log_debug(1 << CXGBI_DBG_DEV,
 326                 "cdev 0x%p, p#%u.\n", cdev, cdev->nports);
 327
 328         for (i = 0; i < cdev->nports; i++) {
 329                 chba = cdev->hbas[i];
 330                 if (chba) {
 331                         cdev->hbas[i] = NULL;
 332                         iscsi_host_remove(chba->shost);
 333                         pci_dev_put(cdev->pdev);
 334                         iscsi_host_free(chba->shost);
 335                 }
 336         }
 337 }
 338 EXPORT_SYMBOL_GPL(cxgbi_hbas_remove);
 339
 340 int cxgbi_hbas_add(struct cxgbi_device *cdev, u64 max_lun,
 341                 unsigned int max_id, struct scsi_host_template *sht,
 342                 struct scsi_transport_template *stt)
 343 {
 344         struct cxgbi_hba *chba;
 345         struct Scsi_Host *shost;
 346         int i, err;
 347
 348         log_debug(1 << CXGBI_DBG_DEV, "cdev 0x%p, p#%u.\n", cdev, cdev->nports);
 349
 350         for (i = 0; i < cdev->nports; i++) {
 351                 shost = iscsi_host_alloc(sht, sizeof(*chba), 1);
 352                 if (!shost) {
 353                         pr_info("0x%p, p%d, %s, host alloc failed.\n",
 354                                 cdev, i, cdev->ports[i]->name);
 355                         err = -ENOMEM;
 356                         goto err_out;
 357                 }
 358
 359                 shost->transportt = stt;
 360                 shost->max_lun = max_lun;
 361                 shost->max_id = max_id;
 362                 shost->max_channel = 0;
 363                 shost->max_cmd_len = 16;
 364
 365                 chba = iscsi_host_priv(shost);
 366                 chba->cdev = cdev;
 367                 chba->ndev = cdev->ports[i];
 368                 chba->shost = shost;
 369
 370                 log_debug(1 << CXGBI_DBG_DEV,
 371                         "cdev 0x%p, p#%d %s: chba 0x%p.\n",
 372                         cdev, i, cdev->ports[i]->name, chba);
 373
 374                 pci_dev_get(cdev->pdev);
 375                 err = iscsi_host_add(shost, &cdev->pdev->dev);
 376                 if (err) {
 377                         pr_info("cdev 0x%p, p#%d %s, host add failed.\n",
 378                                 cdev, i, cdev->ports[i]->name);
 379                         pci_dev_put(cdev->pdev);
 380                         scsi_host_put(shost);
 381                         goto  err_out;
 382                 }
 383
 384                 cdev->hbas[i] = chba;
 385         }
 386
 387         return 0;
 388
 389 err_out:
 390         cxgbi_hbas_remove(cdev);
 391         return err;
 392 }
 393 EXPORT_SYMBOL_GPL(cxgbi_hbas_add);
 394
 395 /*
 396  * iSCSI offload
 397  *
 398  * - source port management
 399  *   To find a free source port in the port allocation map we use a very simple
 400  *   rotor scheme to look for the next free port.
 401  *
 402  *   If a source port has been specified make sure that it doesn't collide with
 403  *   our normal source port allocation map.  If it's outside the range of our
 404  *   allocation/deallocation scheme just let them use it.
 405  *
 406  *   If the source port is outside our allocation range, the caller is
 407  *   responsible for keeping track of their port usage.
 408  */
 409
 410 static struct cxgbi_sock *find_sock_on_port(struct cxgbi_device *cdev,
 411                                             unsigned char port_id)
 412 {
 413         struct cxgbi_ports_map *pmap = &cdev->pmap;
 414         unsigned int i;
 415         unsigned int used;
 416
 417         if (!pmap->max_connect || !pmap->used)
 418                 return NULL;
 419
 420         spin_lock_bh(&pmap->lock);
 421         used = pmap->used;
 422         for (i = 0; used && i < pmap->max_connect; i++) {
 423                 struct cxgbi_sock *csk = pmap->port_csk[i];
 424
 425                 if (csk) {
 426                         if (csk->port_id == port_id) {
 427                                 spin_unlock_bh(&pmap->lock);
 428                                 return csk;
 429                         }
 430                         used--;
 431                 }
 432         }
 433         spin_unlock_bh(&pmap->lock);
 434
 435         return NULL;
 436 }
 437
 438 static int sock_get_port(struct cxgbi_sock *csk)
 439 {
 440         struct cxgbi_device *cdev = csk->cdev;
 441         struct cxgbi_ports_map *pmap = &cdev->pmap;
 442         unsigned int start;
 443         int idx;
 444         __be16 *port;
 445
 446         if (!pmap->max_connect) {
 447                 pr_err("cdev 0x%p, p#%u %s, NO port map.\n",
 448                            cdev, csk->port_id, cdev->ports[csk->port_id]->name);
 449                 return -EADDRNOTAVAIL;
 450         }
 451
 452         if (csk->csk_family == AF_INET)
 453                 port = &csk->saddr.sin_port;
 454         else /* ipv6 */
 455                 port = &csk->saddr6.sin6_port;
 456
 457         if (*port) {
 458                 pr_err("source port NON-ZERO %u.\n",
 459                         ntohs(*port));
 460                 return -EADDRINUSE;
 461         }
 462
 463         spin_lock_bh(&pmap->lock);
 464         if (pmap->used >= pmap->max_connect) {
 465                 spin_unlock_bh(&pmap->lock);
 466                 pr_info("cdev 0x%p, p#%u %s, ALL ports used.\n",
 467                         cdev, csk->port_id, cdev->ports[csk->port_id]->name);
 468                 return -EADDRNOTAVAIL;
 469         }
 470
 471         start = idx = pmap->next;
 472         do {
 473                 if (++idx >= pmap->max_connect)
 474                         idx = 0;
 475                 if (!pmap->port_csk[idx]) {
 476                         pmap->used++;
 477                         *port = htons(pmap->sport_base + idx);
 478                         pmap->next = idx;
 479                         pmap->port_csk[idx] = csk;
 480                         spin_unlock_bh(&pmap->lock);
 481                         cxgbi_sock_get(csk);
 482                         log_debug(1 << CXGBI_DBG_SOCK,
 483                                 "cdev 0x%p, p#%u %s, p %u, %u.\n",
 484                                 cdev, csk->port_id,
 485                                 cdev->ports[csk->port_id]->name,
 486                                 pmap->sport_base + idx, pmap->next);
 487                         return 0;
 488                 }
 489         } while (idx != start);
 490         spin_unlock_bh(&pmap->lock);
 491
 492         /* should not happen */
 493         pr_warn("cdev 0x%p, p#%u %s, next %u?\n",
 494                 cdev, csk->port_id, cdev->ports[csk->port_id]->name,
 495                 pmap->next);
 496         return -EADDRNOTAVAIL;
 497 }
 498
 499 static void sock_put_port(struct cxgbi_sock *csk)
 500 {
 501         struct cxgbi_device *cdev = csk->cdev;
 502         struct cxgbi_ports_map *pmap = &cdev->pmap;
 503         __be16 *port;
 504
 505         if (csk->csk_family == AF_INET)
 506                 port = &csk->saddr.sin_port;
 507         else /* ipv6 */
 508                 port = &csk->saddr6.sin6_port;
 509
 510         if (*port) {
 511                 int idx = ntohs(*port) - pmap->sport_base;
 512
 513                 *port = 0;
 514                 if (idx < 0 || idx >= pmap->max_connect) {
 515                         pr_err("cdev 0x%p, p#%u %s, port %u OOR.\n",
 516                                 cdev, csk->port_id,
 517                                 cdev->ports[csk->port_id]->name,
 518                                 ntohs(*port));
 519                         return;
 520                 }
 521
 522                 spin_lock_bh(&pmap->lock);
 523                 pmap->port_csk[idx] = NULL;
 524                 pmap->used--;
 525                 spin_unlock_bh(&pmap->lock);
 526
 527                 log_debug(1 << CXGBI_DBG_SOCK,
 528                         "cdev 0x%p, p#%u %s, release %u.\n",
 529                         cdev, csk->port_id, cdev->ports[csk->port_id]->name,
 530                         pmap->sport_base + idx);
 531
 532                 cxgbi_sock_put(csk);
 533         }
 534 }
 535
 536 /*
 537  * iscsi tcp connection
 538  */
 539 void cxgbi_sock_free_cpl_skbs(struct cxgbi_sock *csk)
 540 {
 541         if (csk->cpl_close) {
 542                 kfree_skb(csk->cpl_close);
 543                 csk->cpl_close = NULL;
 544         }
 545         if (csk->cpl_abort_req) {
 546                 kfree_skb(csk->cpl_abort_req);
 547                 csk->cpl_abort_req = NULL;
 548         }
 549         if (csk->cpl_abort_rpl) {
 550                 kfree_skb(csk->cpl_abort_rpl);
 551                 csk->cpl_abort_rpl = NULL;
 552         }
 553 }
 554 EXPORT_SYMBOL_GPL(cxgbi_sock_free_cpl_skbs);
 555
 556 static struct cxgbi_sock *cxgbi_sock_create(struct cxgbi_device *cdev)
 557 {
 558         struct cxgbi_sock *csk = kzalloc(sizeof(*csk), GFP_NOIO);
 559
 560         if (!csk) {
 561                 pr_info("alloc csk %zu failed.\n", sizeof(*csk));
 562                 return NULL;
 563         }
 564
 565         if (cdev->csk_alloc_cpls(csk) < 0) {
 566                 pr_info("csk 0x%p, alloc cpls failed.\n", csk);
 567                 kfree(csk);
 568                 return NULL;
 569         }
 570
 571         spin_lock_init(&csk->lock);
 572         kref_init(&csk->refcnt);
 573         skb_queue_head_init(&csk->receive_queue);
 574         skb_queue_head_init(&csk->write_queue);
 575         setup_timer(&csk->retry_timer, NULL, (unsigned long)csk);
 576         rwlock_init(&csk->callback_lock);
 577         csk->cdev = cdev;
 578         csk->flags = 0;
 579         cxgbi_sock_set_state(csk, CTP_CLOSED);
 580
 581         log_debug(1 << CXGBI_DBG_SOCK, "cdev 0x%p, new csk 0x%p.\n", cdev, csk);
 582
 583         return csk;
 584 }
 585
 586 static struct rtable *find_route_ipv4(struct flowi4 *fl4,
 587                                       __be32 saddr, __be32 daddr,
 588                                       __be16 sport, __be16 dport, u8 tos)
 589 {
 590         struct rtable *rt;
 591
 592         rt = ip_route_output_ports(&init_net, fl4, NULL, daddr, saddr,
 593                                    dport, sport, IPPROTO_TCP, tos, 0);
 594         if (IS_ERR(rt))
 595                 return NULL;
 596
 597         return rt;
 598 }
 599
 600 static struct cxgbi_sock *cxgbi_check_route(struct sockaddr *dst_addr)
 601 {
 602         struct sockaddr_in *daddr = (struct sockaddr_in *)dst_addr;
 603         struct dst_entry *dst;
 604         struct net_device *ndev;
 605         struct cxgbi_device *cdev;
 606         struct rtable *rt = NULL;
 607         struct neighbour *n;
 608         struct flowi4 fl4;
 609         struct cxgbi_sock *csk = NULL;
 610         unsigned int mtu = 0;
 611         int port = 0xFFFF;
 612         int err = 0;
 613
 614         rt = find_route_ipv4(&fl4, 0, daddr->sin_addr.s_addr, 0, daddr->sin_port, 0);
 615         if (!rt) {
 616                 pr_info("no route to ipv4 0x%x, port %u.\n",
 617                         be32_to_cpu(daddr->sin_addr.s_addr),
 618                         be16_to_cpu(daddr->sin_port));
 619                 err = -ENETUNREACH;
 620                 goto err_out;
 621         }
 622         dst = &rt->dst;
 623         n = dst_neigh_lookup(dst, &daddr->sin_addr.s_addr);
 624         if (!n) {
 625                 err = -ENODEV;
 626                 goto rel_rt;
 627         }
 628         ndev = n->dev;
 629
 630         if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) {
 631                 pr_info("multi-cast route %pI4, port %u, dev %s.\n",
 632                         &daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
 633                         ndev->name);
 634                 err = -ENETUNREACH;
 635                 goto rel_neigh;
 636         }
 637
 638         if (ndev->flags & IFF_LOOPBACK) {
 639                 ndev = ip_dev_find(&init_net, daddr->sin_addr.s_addr);
 640                 mtu = ndev->mtu;
 641                 pr_info("rt dev %s, loopback -> %s, mtu %u.\n",
 642                         n->dev->name, ndev->name, mtu);
 643         }
 644
 645         if (!(ndev->flags & IFF_UP) || !netif_carrier_ok(ndev)) {
 646                 pr_info("%s interface not up.\n", ndev->name);
 647                 err = -ENETDOWN;
 648                 goto rel_neigh;
 649         }
 650
 651         cdev = cxgbi_device_find_by_netdev(ndev, &port);
 652         if (!cdev) {
 653                 pr_info("dst %pI4, %s, NOT cxgbi device.\n",
 654                         &daddr->sin_addr.s_addr, ndev->name);
 655                 err = -ENETUNREACH;
 656                 goto rel_neigh;
 657         }
 658         log_debug(1 << CXGBI_DBG_SOCK,
 659                 "route to %pI4 :%u, ndev p#%d,%s, cdev 0x%p.\n",
 660                 &daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
 661                            port, ndev->name, cdev);
 662
 663         csk = cxgbi_sock_create(cdev);
 664         if (!csk) {
 665                 err = -ENOMEM;
 666                 goto rel_neigh;
 667         }
 668         csk->cdev = cdev;
 669         csk->port_id = port;
 670         csk->mtu = mtu;
 671         csk->dst = dst;
 672
 673         csk->csk_family = AF_INET;
 674         csk->daddr.sin_addr.s_addr = daddr->sin_addr.s_addr;
 675         csk->daddr.sin_port = daddr->sin_port;
 676         csk->daddr.sin_family = daddr->sin_family;
 677         csk->saddr.sin_family = daddr->sin_family;
 678         csk->saddr.sin_addr.s_addr = fl4.saddr;
 679         neigh_release(n);
 680
 681         return csk;
 682
 683 rel_neigh:
 684         neigh_release(n);
 685
 686 rel_rt:
 687         ip_rt_put(rt);
 688         if (csk)
 689                 cxgbi_sock_closed(csk);
 690 err_out:
 691         return ERR_PTR(err);
 692 }
 693
 694 #if IS_ENABLED(CONFIG_IPV6)
 695 static struct rt6_info *find_route_ipv6(const struct in6_addr *saddr,
 696                                         const struct in6_addr *daddr)
 697 {
 698         struct flowi6 fl;
 699
 700         memset(&fl, 0, sizeof(fl));
 701         if (saddr)
 702                 memcpy(&fl.saddr, saddr, sizeof(struct in6_addr));
 703         if (daddr)
 704                 memcpy(&fl.daddr, daddr, sizeof(struct in6_addr));
 705         return (struct rt6_info *)ip6_route_output(&init_net, NULL, &fl);
 706 }
 707
 708 static struct cxgbi_sock *cxgbi_check_route6(struct sockaddr *dst_addr)
 709 {
 710         struct sockaddr_in6 *daddr6 = (struct sockaddr_in6 *)dst_addr;
 711         struct dst_entry *dst;
 712         struct net_device *ndev;
 713         struct cxgbi_device *cdev;
 714         struct rt6_info *rt = NULL;
 715         struct neighbour *n;
 716         struct in6_addr pref_saddr;
 717         struct cxgbi_sock *csk = NULL;
 718         unsigned int mtu = 0;
 719         int port = 0xFFFF;
 720         int err = 0;
 721
 722         rt = find_route_ipv6(NULL, &daddr6->sin6_addr);
 723
 724         if (!rt) {
 725                 pr_info("no route to ipv6 %pI6 port %u\n",
 726                         daddr6->sin6_addr.s6_addr,
 727                         be16_to_cpu(daddr6->sin6_port));
 728                 err = -ENETUNREACH;
 729                 goto err_out;
 730         }
 731
 732         dst = &rt->dst;
 733
 734         n = dst_neigh_lookup(dst, &daddr6->sin6_addr);
 735
 736         if (!n) {
 737                 pr_info("%pI6, port %u, dst no neighbour.\n",
 738                         daddr6->sin6_addr.s6_addr,
 739                         be16_to_cpu(daddr6->sin6_port));
 740                 err = -ENETUNREACH;
 741                 goto rel_rt;
 742         }
 743         ndev = n->dev;
 744
 745         if (!(ndev->flags & IFF_UP) || !netif_carrier_ok(ndev)) {
 746                 pr_info("%s interface not up.\n", ndev->name);
 747                 err = -ENETDOWN;
 748                 goto rel_rt;
 749         }
 750
 751         if (ipv6_addr_is_multicast(&daddr6->sin6_addr)) {
 752                 pr_info("multi-cast route %pI6 port %u, dev %s.\n",
 753                         daddr6->sin6_addr.s6_addr,
 754                         ntohs(daddr6->sin6_port), ndev->name);
 755                 err = -ENETUNREACH;
 756                 goto rel_rt;
 757         }
 758
 759         cdev = cxgbi_device_find_by_netdev(ndev, &port);
 760         if (!cdev)
 761                 cdev = cxgbi_device_find_by_mac(ndev, &port);
 762         if (!cdev) {
 763                 pr_info("dst %pI6 %s, NOT cxgbi device.\n",
 764                         daddr6->sin6_addr.s6_addr, ndev->name);
 765                 err = -ENETUNREACH;
 766                 goto rel_rt;
 767         }
 768         log_debug(1 << CXGBI_DBG_SOCK,
 769                   "route to %pI6 :%u, ndev p#%d,%s, cdev 0x%p.\n",
 770                   daddr6->sin6_addr.s6_addr, ntohs(daddr6->sin6_port), port,
 771                   ndev->name, cdev);
 772
 773         csk = cxgbi_sock_create(cdev);
 774         if (!csk) {
 775                 err = -ENOMEM;
 776                 goto rel_rt;
 777         }
 778         csk->cdev = cdev;
 779         csk->port_id = port;
 780         csk->mtu = mtu;
 781         csk->dst = dst;
 782
 783         if (ipv6_addr_any(&rt->rt6i_prefsrc.addr)) {
 784                 struct inet6_dev *idev = ip6_dst_idev((struct dst_entry *)rt);
 785
 786                 err = ipv6_dev_get_saddr(&init_net, idev ? idev->dev : NULL,
 787                                          &daddr6->sin6_addr, 0, &pref_saddr);
 788                 if (err) {
 789                         pr_info("failed to get source address to reach %pI6\n",
 790                                 &daddr6->sin6_addr);
 791                         goto rel_rt;
 792                 }
 793         } else {
 794                 pref_saddr = rt->rt6i_prefsrc.addr;
 795         }
 796
 797         csk->csk_family = AF_INET6;
 798         csk->daddr6.sin6_addr = daddr6->sin6_addr;
 799         csk->daddr6.sin6_port = daddr6->sin6_port;
 800         csk->daddr6.sin6_family = daddr6->sin6_family;
 801         csk->saddr6.sin6_family = daddr6->sin6_family;
 802         csk->saddr6.sin6_addr = pref_saddr;
 803
 804         neigh_release(n);
 805         return csk;
 806
 807 rel_rt:
 808         if (n)
 809                 neigh_release(n);
 810
 811         ip6_rt_put(rt);
 812         if (csk)
 813                 cxgbi_sock_closed(csk);
 814 err_out:
 815         return ERR_PTR(err);
 816 }
 817 #endif /* IS_ENABLED(CONFIG_IPV6) */
 818
 819 void cxgbi_sock_established(struct cxgbi_sock *csk, unsigned int snd_isn,
 820                         unsigned int opt)
 821 {
 822         csk->write_seq = csk->snd_nxt = csk->snd_una = snd_isn;
 823         dst_confirm(csk->dst);
 824         smp_mb();
 825         cxgbi_sock_set_state(csk, CTP_ESTABLISHED);
 826 }
 827 EXPORT_SYMBOL_GPL(cxgbi_sock_established);
 828
 829 static void cxgbi_inform_iscsi_conn_closing(struct cxgbi_sock *csk)
 830 {
 831         log_debug(1 << CXGBI_DBG_SOCK,
 832                 "csk 0x%p, state %u, flags 0x%lx, conn 0x%p.\n",
 833                 csk, csk->state, csk->flags, csk->user_data);
 834
 835         if (csk->state != CTP_ESTABLISHED) {
 836                 read_lock_bh(&csk->callback_lock);
 837                 if (csk->user_data)
 838                         iscsi_conn_failure(csk->user_data,
 839                                         ISCSI_ERR_TCP_CONN_CLOSE);
 840                 read_unlock_bh(&csk->callback_lock);
 841         }
 842 }
 843
 844 void cxgbi_sock_closed(struct cxgbi_sock *csk)
 845 {
 846         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 847                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 848         cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
 849         if (csk->state == CTP_ACTIVE_OPEN || csk->state == CTP_CLOSED)
 850                 return;
 851         if (csk->saddr.sin_port)
 852                 sock_put_port(csk);
 853         if (csk->dst)
 854                 dst_release(csk->dst);
 855         csk->cdev->csk_release_offload_resources(csk);
 856         cxgbi_sock_set_state(csk, CTP_CLOSED);
 857         cxgbi_inform_iscsi_conn_closing(csk);
 858         cxgbi_sock_put(csk);
 859 }
 860 EXPORT_SYMBOL_GPL(cxgbi_sock_closed);
 861
 862 static void need_active_close(struct cxgbi_sock *csk)
 863 {
 864         int data_lost;
 865         int close_req = 0;
 866
 867         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 868                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 869         spin_lock_bh(&csk->lock);
 870         dst_confirm(csk->dst);
 871         data_lost = skb_queue_len(&csk->receive_queue);
 872         __skb_queue_purge(&csk->receive_queue);
 873
 874         if (csk->state == CTP_ACTIVE_OPEN)
 875                 cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
 876         else if (csk->state == CTP_ESTABLISHED) {
 877                 close_req = 1;
 878                 cxgbi_sock_set_state(csk, CTP_ACTIVE_CLOSE);
 879         } else if (csk->state == CTP_PASSIVE_CLOSE) {
 880                 close_req = 1;
 881                 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
 882         }
 883
 884         if (close_req) {
 885                 if (data_lost)
 886                         csk->cdev->csk_send_abort_req(csk);
 887                 else
 888                         csk->cdev->csk_send_close_req(csk);
 889         }
 890
 891         spin_unlock_bh(&csk->lock);
 892 }
 893
 894 void cxgbi_sock_fail_act_open(struct cxgbi_sock *csk, int errno)
 895 {
 896         pr_info("csk 0x%p,%u,%lx, %pI4:%u-%pI4:%u, err %d.\n",
 897                         csk, csk->state, csk->flags,
 898                         &csk->saddr.sin_addr.s_addr, csk->saddr.sin_port,
 899                         &csk->daddr.sin_addr.s_addr, csk->daddr.sin_port,
 900                         errno);
 901
 902         cxgbi_sock_set_state(csk, CTP_CONNECTING);
 903         csk->err = errno;
 904         cxgbi_sock_closed(csk);
 905 }
 906 EXPORT_SYMBOL_GPL(cxgbi_sock_fail_act_open);
 907
 908 void cxgbi_sock_act_open_req_arp_failure(void *handle, struct sk_buff *skb)
 909 {
 910         struct cxgbi_sock *csk = (struct cxgbi_sock *)skb->sk;
 911         struct module *owner = csk->cdev->owner;
 912
 913         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 914                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 915         cxgbi_sock_get(csk);
 916         spin_lock_bh(&csk->lock);
 917         if (csk->state == CTP_ACTIVE_OPEN)
 918                 cxgbi_sock_fail_act_open(csk, -EHOSTUNREACH);
 919         spin_unlock_bh(&csk->lock);
 920         cxgbi_sock_put(csk);
 921         __kfree_skb(skb);
 922
 923         module_put(owner);
 924 }
 925 EXPORT_SYMBOL_GPL(cxgbi_sock_act_open_req_arp_failure);
 926
 927 void cxgbi_sock_rcv_abort_rpl(struct cxgbi_sock *csk)
 928 {
 929         cxgbi_sock_get(csk);
 930         spin_lock_bh(&csk->lock);
 931
 932         cxgbi_sock_set_flag(csk, CTPF_ABORT_RPL_RCVD);
 933         if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING)) {
 934                 cxgbi_sock_clear_flag(csk, CTPF_ABORT_RPL_PENDING);
 935                 if (cxgbi_sock_flag(csk, CTPF_ABORT_REQ_RCVD))
 936                         pr_err("csk 0x%p,%u,0x%lx,%u,ABT_RPL_RSS.\n",
 937                                csk, csk->state, csk->flags, csk->tid);
 938                 cxgbi_sock_closed(csk);
 939         }
 940
 941         spin_unlock_bh(&csk->lock);
 942         cxgbi_sock_put(csk);
 943 }
 944 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_abort_rpl);
 945
 946 void cxgbi_sock_rcv_peer_close(struct cxgbi_sock *csk)
 947 {
 948         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 949                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 950         cxgbi_sock_get(csk);
 951         spin_lock_bh(&csk->lock);
 952
 953         if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
 954                 goto done;
 955
 956         switch (csk->state) {
 957         case CTP_ESTABLISHED:
 958                 cxgbi_sock_set_state(csk, CTP_PASSIVE_CLOSE);
 959                 break;
 960         case CTP_ACTIVE_CLOSE:
 961                 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
 962                 break;
 963         case CTP_CLOSE_WAIT_1:
 964                 cxgbi_sock_closed(csk);
 965                 break;
 966         case CTP_ABORTING:
 967                 break;
 968         default:
 969                 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
 970                         csk, csk->state, csk->flags, csk->tid);
 971         }
 972         cxgbi_inform_iscsi_conn_closing(csk);
 973 done:
 974         spin_unlock_bh(&csk->lock);
 975         cxgbi_sock_put(csk);
 976 }
 977 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_peer_close);
 978
 979 void cxgbi_sock_rcv_close_conn_rpl(struct cxgbi_sock *csk, u32 snd_nxt)
 980 {
 981         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 982                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 983         cxgbi_sock_get(csk);
 984         spin_lock_bh(&csk->lock);
 985
 986         csk->snd_una = snd_nxt - 1;
 987         if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
 988                 goto done;
 989
 990         switch (csk->state) {
 991         case CTP_ACTIVE_CLOSE:
 992                 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_1);
 993                 break;
 994         case CTP_CLOSE_WAIT_1:
 995         case CTP_CLOSE_WAIT_2:
 996                 cxgbi_sock_closed(csk);
 997                 break;
 998         case CTP_ABORTING:
 999                 break;
1000         default:
1001                 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
1002                         csk, csk->state, csk->flags, csk->tid);
1003         }
1004 done:
1005         spin_unlock_bh(&csk->lock);
1006         cxgbi_sock_put(csk);
1007 }
1008 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_close_conn_rpl);
1009
1010 void cxgbi_sock_rcv_wr_ack(struct cxgbi_sock *csk, unsigned int credits,
1011                            unsigned int snd_una, int seq_chk)
1012 {
1013         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1014                         "csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, snd_una %u,%d.\n",
1015                         csk, csk->state, csk->flags, csk->tid, credits,
1016                         csk->wr_cred, csk->wr_una_cred, snd_una, seq_chk);
1017
1018         spin_lock_bh(&csk->lock);
1019
1020         csk->wr_cred += credits;
1021         if (csk->wr_una_cred > csk->wr_max_cred - csk->wr_cred)
1022                 csk->wr_una_cred = csk->wr_max_cred - csk->wr_cred;
1023
1024         while (credits) {
1025                 struct sk_buff *p = cxgbi_sock_peek_wr(csk);
1026
1027                 if (unlikely(!p)) {
1028                         pr_err("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, empty.\n",
1029                                 csk, csk->state, csk->flags, csk->tid, credits,
1030                                 csk->wr_cred, csk->wr_una_cred);
1031                         break;
1032                 }
1033
1034                 if (unlikely(credits < p->csum)) {
1035                         pr_warn("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, < %u.\n",
1036                                 csk, csk->state, csk->flags, csk->tid,
1037                                 credits, csk->wr_cred, csk->wr_una_cred,
1038                                 p->csum);
1039                         p->csum -= credits;
1040                         break;
1041                 } else {
1042                         cxgbi_sock_dequeue_wr(csk);
1043                         credits -= p->csum;
1044                         kfree_skb(p);
1045                 }
1046         }
1047
1048         cxgbi_sock_check_wr_invariants(csk);
1049
1050         if (seq_chk) {
1051                 if (unlikely(before(snd_una, csk->snd_una))) {
1052                         pr_warn("csk 0x%p,%u,0x%lx,%u, snd_una %u/%u.",
1053                                 csk, csk->state, csk->flags, csk->tid, snd_una,
1054                                 csk->snd_una);
1055                         goto done;
1056                 }
1057
1058                 if (csk->snd_una != snd_una) {
1059                         csk->snd_una = snd_una;
1060                         dst_confirm(csk->dst);
1061                 }
1062         }
1063
1064         if (skb_queue_len(&csk->write_queue)) {
1065                 if (csk->cdev->csk_push_tx_frames(csk, 0))
1066                         cxgbi_conn_tx_open(csk);
1067         } else
1068                 cxgbi_conn_tx_open(csk);
1069 done:
1070         spin_unlock_bh(&csk->lock);
1071 }
1072 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_wr_ack);
1073
1074 static unsigned int cxgbi_sock_find_best_mtu(struct cxgbi_sock *csk,
1075                                              unsigned short mtu)
1076 {
1077         int i = 0;
1078
1079         while (i < csk->cdev->nmtus - 1 && csk->cdev->mtus[i + 1] <= mtu)
1080                 ++i;
1081
1082         return i;
1083 }
1084
1085 unsigned int cxgbi_sock_select_mss(struct cxgbi_sock *csk, unsigned int pmtu)
1086 {
1087         unsigned int idx;
1088         struct dst_entry *dst = csk->dst;
1089
1090         csk->advmss = dst_metric_advmss(dst);
1091
1092         if (csk->advmss > pmtu - 40)
1093                 csk->advmss = pmtu - 40;
1094         if (csk->advmss < csk->cdev->mtus[0] - 40)
1095                 csk->advmss = csk->cdev->mtus[0] - 40;
1096         idx = cxgbi_sock_find_best_mtu(csk, csk->advmss + 40);
1097
1098         return idx;
1099 }
1100 EXPORT_SYMBOL_GPL(cxgbi_sock_select_mss);
1101
1102 void cxgbi_sock_skb_entail(struct cxgbi_sock *csk, struct sk_buff *skb)
1103 {
1104         cxgbi_skcb_tcp_seq(skb) = csk->write_seq;
1105         __skb_queue_tail(&csk->write_queue, skb);
1106 }
1107 EXPORT_SYMBOL_GPL(cxgbi_sock_skb_entail);
1108
1109 void cxgbi_sock_purge_wr_queue(struct cxgbi_sock *csk)
1110 {
1111         struct sk_buff *skb;
1112
1113         while ((skb = cxgbi_sock_dequeue_wr(csk)) != NULL)
1114                 kfree_skb(skb);
1115 }
1116 EXPORT_SYMBOL_GPL(cxgbi_sock_purge_wr_queue);
1117
1118 void cxgbi_sock_check_wr_invariants(const struct cxgbi_sock *csk)
1119 {
1120         int pending = cxgbi_sock_count_pending_wrs(csk);
1121
1122         if (unlikely(csk->wr_cred + pending != csk->wr_max_cred))
1123                 pr_err("csk 0x%p, tid %u, credit %u + %u != %u.\n",
1124                         csk, csk->tid, csk->wr_cred, pending, csk->wr_max_cred);
1125 }
1126 EXPORT_SYMBOL_GPL(cxgbi_sock_check_wr_invariants);
1127
1128 static int cxgbi_sock_send_pdus(struct cxgbi_sock *csk, struct sk_buff *skb)
1129 {
1130         struct cxgbi_device *cdev = csk->cdev;
1131         struct sk_buff *next;
1132         int err, copied = 0;
1133
1134         spin_lock_bh(&csk->lock);
1135
1136         if (csk->state != CTP_ESTABLISHED) {
1137                 log_debug(1 << CXGBI_DBG_PDU_TX,
1138                         "csk 0x%p,%u,0x%lx,%u, EAGAIN.\n",
1139                         csk, csk->state, csk->flags, csk->tid);
1140                 err = -EAGAIN;
1141                 goto out_err;
1142         }
1143
1144         if (csk->err) {
1145                 log_debug(1 << CXGBI_DBG_PDU_TX,
1146                         "csk 0x%p,%u,0x%lx,%u, EPIPE %d.\n",
1147                         csk, csk->state, csk->flags, csk->tid, csk->err);
1148                 err = -EPIPE;
1149                 goto out_err;
1150         }
1151
1152         if (csk->write_seq - csk->snd_una >= csk->snd_win) {
1153                 log_debug(1 << CXGBI_DBG_PDU_TX,
1154                         "csk 0x%p,%u,0x%lx,%u, FULL %u-%u >= %u.\n",
1155                         csk, csk->state, csk->flags, csk->tid, csk->write_seq,
1156                         csk->snd_una, csk->snd_win);
1157                 err = -ENOBUFS;
1158                 goto out_err;
1159         }
1160
1161         while (skb) {
1162                 int frags = skb_shinfo(skb)->nr_frags +
1163                                 (skb->len != skb->data_len);
1164
1165                 if (unlikely(skb_headroom(skb) < cdev->skb_tx_rsvd)) {
1166                         pr_err("csk 0x%p, skb head %u < %u.\n",
1167                                 csk, skb_headroom(skb), cdev->skb_tx_rsvd);
1168                         err = -EINVAL;
1169                         goto out_err;
1170                 }
1171
1172                 if (frags >= SKB_WR_LIST_SIZE) {
1173                         pr_err("csk 0x%p, frags %d, %u,%u >%u.\n",
1174                                 csk, skb_shinfo(skb)->nr_frags, skb->len,
1175                                 skb->data_len, (uint)(SKB_WR_LIST_SIZE));
1176                         err = -EINVAL;
1177                         goto out_err;
1178                 }
1179
1180                 next = skb->next;
1181                 skb->next = NULL;
1182                 cxgbi_skcb_set_flag(skb, SKCBF_TX_NEED_HDR);
1183                 cxgbi_sock_skb_entail(csk, skb);
1184                 copied += skb->len;
1185                 csk->write_seq += skb->len +
1186                                 cxgbi_ulp_extra_len(cxgbi_skcb_ulp_mode(skb));
1187                 skb = next;
1188         }
1189 done:
1190         if (likely(skb_queue_len(&csk->write_queue)))
1191                 cdev->csk_push_tx_frames(csk, 1);
1192         spin_unlock_bh(&csk->lock);
1193         return copied;
1194
1195 out_err:
1196         if (copied == 0 && err == -EPIPE)
1197                 copied = csk->err ? csk->err : -EPIPE;
1198         else
1199                 copied = err;
1200         goto done;
1201 }
1202
1203 static inline void
1204 scmd_get_params(struct scsi_cmnd *sc, struct scatterlist **sgl,
1205                 unsigned int *sgcnt, unsigned int *dlen,
1206                 unsigned int prot)
1207 {
1208         struct scsi_data_buffer *sdb = prot ? scsi_prot(sc) : scsi_out(sc);
1209
1210         *sgl = sdb->table.sgl;
1211         *sgcnt = sdb->table.nents;
1212         *dlen = sdb->length;
1213         /* Caution: for protection sdb, sdb->length is invalid */
1214 }
1215
1216 void cxgbi_ddp_set_one_ppod(struct cxgbi_pagepod *ppod,
1217                             struct cxgbi_task_tag_info *ttinfo,
1218                             struct scatterlist **sg_pp, unsigned int *sg_off)
1219 {
1220         struct scatterlist *sg = sg_pp ? *sg_pp : NULL;
1221         unsigned int offset = sg_off ? *sg_off : 0;
1222         dma_addr_t addr = 0UL;
1223         unsigned int len = 0;
1224         int i;
1225
1226         memcpy(ppod, &ttinfo->hdr, sizeof(struct cxgbi_pagepod_hdr));
1227
1228         if (sg) {
1229                 addr = sg_dma_address(sg);
1230                 len = sg_dma_len(sg);
1231         }
1232
1233         for (i = 0; i < PPOD_PAGES_MAX; i++) {
1234                 if (sg) {
1235                         ppod->addr[i] = cpu_to_be64(addr + offset);
1236                         offset += PAGE_SIZE;
1237                         if (offset == (len + sg->offset)) {
1238                                 offset = 0;
1239                                 sg = sg_next(sg);
1240                                 if (sg) {
1241                                         addr = sg_dma_address(sg);
1242                                         len = sg_dma_len(sg);
1243                                 }
1244                         }
1245                 } else {
1246                         ppod->addr[i] = 0ULL;
1247                 }
1248         }
1249
1250         /*
1251          * the fifth address needs to be repeated in the next ppod, so do
1252          * not move sg
1253          */
1254         if (sg_pp) {
1255                 *sg_pp = sg;
1256                 *sg_off = offset;
1257         }
1258
1259         if (offset == len) {
1260                 offset = 0;
1261                 sg = sg_next(sg);
1262                 if (sg) {
1263                         addr = sg_dma_address(sg);
1264                         len = sg_dma_len(sg);
1265                 }
1266         }
1267         ppod->addr[i] = sg ? cpu_to_be64(addr + offset) : 0ULL;
1268 }
1269 EXPORT_SYMBOL_GPL(cxgbi_ddp_set_one_ppod);
1270
1271 /*
1272  * APIs interacting with open-iscsi libraries
1273  */
1274
1275 static unsigned char padding[4];
1276
1277 void cxgbi_ddp_ppm_setup(void **ppm_pp, struct cxgbi_device *cdev,
1278                          struct cxgbi_tag_format *tformat, unsigned int ppmax,
1279                          unsigned int llimit, unsigned int start,
1280                          unsigned int rsvd_factor)
1281 {
1282         int err = cxgbi_ppm_init(ppm_pp, cdev->ports[0], cdev->pdev,
1283                                 cdev->lldev, tformat, ppmax, llimit, start,
1284                                 rsvd_factor);
1285
1286         if (err >= 0) {
1287                 struct cxgbi_ppm *ppm = (struct cxgbi_ppm *)(*ppm_pp);
1288
1289                 if (ppm->ppmax < 1024 ||
1290                     ppm->tformat.pgsz_idx_dflt >= DDP_PGIDX_MAX)
1291                         cdev->flags |= CXGBI_FLAG_DDP_OFF;
1292                 err = 0;
1293         } else {
1294                 cdev->flags |= CXGBI_FLAG_DDP_OFF;
1295         }
1296 }
1297 EXPORT_SYMBOL_GPL(cxgbi_ddp_ppm_setup);
1298
1299 static int cxgbi_ddp_sgl_check(struct scatterlist *sgl, int nents)
1300 {
1301         int i;
1302         int last_sgidx = nents - 1;
1303         struct scatterlist *sg = sgl;
1304
1305         for (i = 0; i < nents; i++, sg = sg_next(sg)) {
1306                 unsigned int len = sg->length + sg->offset;
1307
1308                 if ((sg->offset & 0x3) || (i && sg->offset) ||
1309                     ((i != last_sgidx) && len != PAGE_SIZE)) {
1310                         log_debug(1 << CXGBI_DBG_DDP,
1311                                   "sg %u/%u, %u,%u, not aligned.\n",
1312                                   i, nents, sg->offset, sg->length);
1313                         goto err_out;
1314                 }
1315         }
1316         return 0;
1317 err_out:
1318         return -EINVAL;
1319 }
1320
1321 static int cxgbi_ddp_reserve(struct cxgbi_conn *cconn,
1322                              struct cxgbi_task_data *tdata, u32 sw_tag,
1323                              unsigned int xferlen)
1324 {
1325         struct cxgbi_sock *csk = cconn->cep->csk;
1326         struct cxgbi_device *cdev = csk->cdev;
1327         struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
1328         struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
1329         struct scatterlist *sgl = ttinfo->sgl;
1330         unsigned int sgcnt = ttinfo->nents;
1331         unsigned int sg_offset = sgl->offset;
1332         int err;
1333
1334         if (cdev->flags & CXGBI_FLAG_DDP_OFF) {
1335                 log_debug(1 << CXGBI_DBG_DDP,
1336                           "cdev 0x%p DDP off.\n", cdev);
1337                 return -EINVAL;
1338         }
1339
1340         if (!ppm || xferlen < DDP_THRESHOLD || !sgcnt ||
1341             ppm->tformat.pgsz_idx_dflt >= DDP_PGIDX_MAX) {
1342                 log_debug(1 << CXGBI_DBG_DDP,
1343                           "ppm 0x%p, pgidx %u, xfer %u, sgcnt %u, NO ddp.\n",
1344                           ppm, ppm ? ppm->tformat.pgsz_idx_dflt : DDP_PGIDX_MAX,
1345                           xferlen, ttinfo->nents);
1346                 return -EINVAL;
1347         }
1348
1349         /* make sure the buffer is suitable for ddp */
1350         if (cxgbi_ddp_sgl_check(sgl, sgcnt) < 0)
1351                 return -EINVAL;
1352
1353         ttinfo->nr_pages = (xferlen + sgl->offset + (1 << PAGE_SHIFT) - 1) >>
1354                             PAGE_SHIFT;
1355
1356         /*
1357          * the ddp tag will be used for the itt in the outgoing pdu,
1358          * the itt genrated by libiscsi is saved in the ppm and can be
1359          * retrieved via the ddp tag
1360          */
1361         err = cxgbi_ppm_ppods_reserve(ppm, ttinfo->nr_pages, 0, &ttinfo->idx,
1362                                       &ttinfo->tag, (unsigned long)sw_tag);
1363         if (err < 0) {
1364                 cconn->ddp_full++;
1365                 return err;
1366         }
1367         ttinfo->npods = err;
1368
1369          /* setup dma from scsi command sgl */
1370         sgl->offset = 0;
1371         err = dma_map_sg(&ppm->pdev->dev, sgl, sgcnt, DMA_FROM_DEVICE);
1372         sgl->offset = sg_offset;
1373         if (err == 0) {
1374                 pr_info("%s: 0x%x, xfer %u, sgl %u dma mapping err.\n",
1375                         __func__, sw_tag, xferlen, sgcnt);
1376                 goto rel_ppods;
1377         }
1378         if (err != ttinfo->nr_pages) {
1379                 log_debug(1 << CXGBI_DBG_DDP,
1380                           "%s: sw tag 0x%x, xfer %u, sgl %u, dma count %d.\n",
1381                           __func__, sw_tag, xferlen, sgcnt, err);
1382         }
1383
1384         ttinfo->flags |= CXGBI_PPOD_INFO_FLAG_MAPPED;
1385         ttinfo->cid = csk->port_id;
1386
1387         cxgbi_ppm_make_ppod_hdr(ppm, ttinfo->tag, csk->tid, sgl->offset,
1388                                 xferlen, &ttinfo->hdr);
1389
1390         if (cdev->flags & CXGBI_FLAG_USE_PPOD_OFLDQ) {
1391                 /* write ppod from xmit_pdu (of iscsi_scsi_command pdu) */
1392                 ttinfo->flags |= CXGBI_PPOD_INFO_FLAG_VALID;
1393         } else {
1394                 /* write ppod from control queue now */
1395                 err = cdev->csk_ddp_set_map(ppm, csk, ttinfo);
1396                 if (err < 0)
1397                         goto rel_ppods;
1398         }
1399
1400         return 0;
1401
1402 rel_ppods:
1403         cxgbi_ppm_ppod_release(ppm, ttinfo->idx);
1404
1405         if (ttinfo->flags & CXGBI_PPOD_INFO_FLAG_MAPPED) {
1406                 ttinfo->flags &= ~CXGBI_PPOD_INFO_FLAG_MAPPED;
1407                 dma_unmap_sg(&ppm->pdev->dev, sgl, sgcnt, DMA_FROM_DEVICE);
1408         }
1409         return -EINVAL;
1410 }
1411
1412 static void task_release_itt(struct iscsi_task *task, itt_t hdr_itt)
1413 {
1414         struct scsi_cmnd *sc = task->sc;
1415         struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
1416         struct cxgbi_conn *cconn = tcp_conn->dd_data;
1417         struct cxgbi_device *cdev = cconn->chba->cdev;
1418         struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
1419         u32 tag = ntohl((__force u32)hdr_itt);
1420
1421         log_debug(1 << CXGBI_DBG_DDP,
1422                   "cdev 0x%p, task 0x%p, release tag 0x%x.\n",
1423                   cdev, task, tag);
1424         if (sc &&
1425             (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE) &&
1426             cxgbi_ppm_is_ddp_tag(ppm, tag)) {
1427                 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1428                 struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
1429
1430                 if (!(cdev->flags & CXGBI_FLAG_USE_PPOD_OFLDQ))
1431                         cdev->csk_ddp_clear_map(cdev, ppm, ttinfo);
1432                 cxgbi_ppm_ppod_release(ppm, ttinfo->idx);
1433                 dma_unmap_sg(&ppm->pdev->dev, ttinfo->sgl, ttinfo->nents,
1434                              DMA_FROM_DEVICE);
1435         }
1436 }
1437
1438 static inline u32 cxgbi_build_sw_tag(u32 idx, u32 age)
1439 {
1440         /* assume idx and age both are < 0x7FFF (32767) */
1441         return (idx << 16) | age;
1442 }
1443
1444 static int task_reserve_itt(struct iscsi_task *task, itt_t *hdr_itt)
1445 {
1446         struct scsi_cmnd *sc = task->sc;
1447         struct iscsi_conn *conn = task->conn;
1448         struct iscsi_session *sess = conn->session;
1449         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1450         struct cxgbi_conn *cconn = tcp_conn->dd_data;
1451         struct cxgbi_device *cdev = cconn->chba->cdev;
1452         struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
1453         u32 sw_tag = cxgbi_build_sw_tag(task->itt, sess->age);
1454         u32 tag = 0;
1455         int err = -EINVAL;
1456
1457         if (sc &&
1458             (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE)
1459         ) {
1460                 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1461                 struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
1462
1463                 scmd_get_params(sc, &ttinfo->sgl, &ttinfo->nents,
1464                                 &tdata->dlen, 0);
1465                 err = cxgbi_ddp_reserve(cconn, tdata, sw_tag, tdata->dlen);
1466                 if (!err)
1467                         tag = ttinfo->tag;
1468                 else
1469                          log_debug(1 << CXGBI_DBG_DDP,
1470                                    "csk 0x%p, R task 0x%p, %u,%u, no ddp.\n",
1471                                    cconn->cep->csk, task, tdata->dlen,
1472                                    ttinfo->nents);
1473         }
1474
1475         if (err < 0) {
1476                 err = cxgbi_ppm_make_non_ddp_tag(ppm, sw_tag, &tag);
1477                 if (err < 0)
1478                         return err;
1479         }
1480         /*  the itt need to sent in big-endian order */
1481         *hdr_itt = (__force itt_t)htonl(tag);
1482
1483         log_debug(1 << CXGBI_DBG_DDP,
1484                   "cdev 0x%p, task 0x%p, 0x%x(0x%x,0x%x)->0x%x/0x%x.\n",
1485                   cdev, task, sw_tag, task->itt, sess->age, tag, *hdr_itt);
1486         return 0;
1487 }
1488
1489 void cxgbi_parse_pdu_itt(struct iscsi_conn *conn, itt_t itt, int *idx, int *age)
1490 {
1491         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1492         struct cxgbi_conn *cconn = tcp_conn->dd_data;
1493         struct cxgbi_device *cdev = cconn->chba->cdev;
1494         struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
1495         u32 tag = ntohl((__force u32)itt);
1496         u32 sw_bits;
1497
1498         if (ppm) {
1499                 if (cxgbi_ppm_is_ddp_tag(ppm, tag))
1500                         sw_bits = cxgbi_ppm_get_tag_caller_data(ppm, tag);
1501                 else
1502                         sw_bits = cxgbi_ppm_decode_non_ddp_tag(ppm, tag);
1503         } else {
1504                 sw_bits = tag;
1505         }
1506
1507         cxgbi_decode_sw_tag(sw_bits, idx, age);
1508         log_debug(1 << CXGBI_DBG_DDP,
1509                   "cdev 0x%p, tag 0x%x/0x%x, -> 0x%x(0x%x,0x%x).\n",
1510                   cdev, tag, itt, sw_bits, idx ? *idx : 0xFFFFF,
1511                   age ? *age : 0xFF);
1512 }
1513 EXPORT_SYMBOL_GPL(cxgbi_parse_pdu_itt);
1514
1515 void cxgbi_conn_tx_open(struct cxgbi_sock *csk)
1516 {
1517         struct iscsi_conn *conn = csk->user_data;
1518
1519         if (conn) {
1520                 log_debug(1 << CXGBI_DBG_SOCK,
1521                         "csk 0x%p, cid %d.\n", csk, conn->id);
1522                 iscsi_conn_queue_work(conn);
1523         }
1524 }
1525 EXPORT_SYMBOL_GPL(cxgbi_conn_tx_open);
1526
1527 /*
1528  * pdu receive, interact with libiscsi_tcp
1529  */
1530 static inline int read_pdu_skb(struct iscsi_conn *conn,
1531                                struct sk_buff *skb,
1532                                unsigned int offset,
1533                                int offloaded)
1534 {
1535         int status = 0;
1536         int bytes_read;
1537
1538         bytes_read = iscsi_tcp_recv_skb(conn, skb, offset, offloaded, &status);
1539         switch (status) {
1540         case ISCSI_TCP_CONN_ERR:
1541                 pr_info("skb 0x%p, off %u, %d, TCP_ERR.\n",
1542                           skb, offset, offloaded);
1543                 return -EIO;
1544         case ISCSI_TCP_SUSPENDED:
1545                 log_debug(1 << CXGBI_DBG_PDU_RX,
1546                         "skb 0x%p, off %u, %d, TCP_SUSPEND, rc %d.\n",
1547                         skb, offset, offloaded, bytes_read);
1548                 /* no transfer - just have caller flush queue */
1549                 return bytes_read;
1550         case ISCSI_TCP_SKB_DONE:
1551                 pr_info("skb 0x%p, off %u, %d, TCP_SKB_DONE.\n",
1552                         skb, offset, offloaded);
1553                 /*
1554                  * pdus should always fit in the skb and we should get
1555                  * segment done notifcation.
1556                  */
1557                 iscsi_conn_printk(KERN_ERR, conn, "Invalid pdu or skb.");
1558                 return -EFAULT;
1559         case ISCSI_TCP_SEGMENT_DONE:
1560                 log_debug(1 << CXGBI_DBG_PDU_RX,
1561                         "skb 0x%p, off %u, %d, TCP_SEG_DONE, rc %d.\n",
1562                         skb, offset, offloaded, bytes_read);
1563                 return bytes_read;
1564         default:
1565                 pr_info("skb 0x%p, off %u, %d, invalid status %d.\n",
1566                         skb, offset, offloaded, status);
1567                 return -EINVAL;
1568         }
1569 }
1570
1571 static int skb_read_pdu_bhs(struct iscsi_conn *conn, struct sk_buff *skb)
1572 {
1573         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1574
1575         log_debug(1 << CXGBI_DBG_PDU_RX,
1576                 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1577                 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1578
1579         if (!iscsi_tcp_recv_segment_is_hdr(tcp_conn)) {
1580                 pr_info("conn 0x%p, skb 0x%p, not hdr.\n", conn, skb);
1581                 iscsi_conn_failure(conn, ISCSI_ERR_PROTO);
1582                 return -EIO;
1583         }
1584
1585         if (conn->hdrdgst_en &&
1586             cxgbi_skcb_test_flag(skb, SKCBF_RX_HCRC_ERR)) {
1587                 pr_info("conn 0x%p, skb 0x%p, hcrc.\n", conn, skb);
1588                 iscsi_conn_failure(conn, ISCSI_ERR_HDR_DGST);
1589                 return -EIO;
1590         }
1591
1592         if (cxgbi_skcb_test_flag(skb, SKCBF_RX_ISCSI_COMPL) &&
1593             cxgbi_skcb_test_flag(skb, SKCBF_RX_DATA_DDPD)) {
1594                 /* If completion flag is set and data is directly
1595                  * placed in to the host memory then update
1596                  * task->exp_datasn to the datasn in completion
1597                  * iSCSI hdr as T6 adapter generates completion only
1598                  * for the last pdu of a sequence.
1599                  */
1600                 itt_t itt = ((struct iscsi_data *)skb->data)->itt;
1601                 struct iscsi_task *task = iscsi_itt_to_ctask(conn, itt);
1602                 u32 data_sn = be32_to_cpu(((struct iscsi_data *)
1603                                                         skb->data)->datasn);
1604                 if (task && task->sc) {
1605                         struct iscsi_tcp_task *tcp_task = task->dd_data;
1606
1607                         tcp_task->exp_datasn = data_sn;
1608                 }
1609         }
1610
1611         return read_pdu_skb(conn, skb, 0, 0);
1612 }
1613
1614 static int skb_read_pdu_data(struct iscsi_conn *conn, struct sk_buff *lskb,
1615                              struct sk_buff *skb, unsigned int offset)
1616 {
1617         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1618         bool offloaded = 0;
1619         int opcode = tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK;
1620
1621         log_debug(1 << CXGBI_DBG_PDU_RX,
1622                 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1623                 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1624
1625         if (conn->datadgst_en &&
1626             cxgbi_skcb_test_flag(lskb, SKCBF_RX_DCRC_ERR)) {
1627                 pr_info("conn 0x%p, skb 0x%p, dcrc 0x%lx.\n",
1628                         conn, lskb, cxgbi_skcb_flags(lskb));
1629                 iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST);
1630                 return -EIO;
1631         }
1632
1633         if (iscsi_tcp_recv_segment_is_hdr(tcp_conn))
1634                 return 0;
1635
1636         /* coalesced, add header digest length */
1637         if (lskb == skb && conn->hdrdgst_en)
1638                 offset += ISCSI_DIGEST_SIZE;
1639
1640         if (cxgbi_skcb_test_flag(lskb, SKCBF_RX_DATA_DDPD))
1641                 offloaded = 1;
1642
1643         if (opcode == ISCSI_OP_SCSI_DATA_IN)
1644                 log_debug(1 << CXGBI_DBG_PDU_RX,
1645                         "skb 0x%p, op 0x%x, itt 0x%x, %u %s ddp'ed.\n",
1646                         skb, opcode, ntohl(tcp_conn->in.hdr->itt),
1647                         tcp_conn->in.datalen, offloaded ? "is" : "not");
1648
1649         return read_pdu_skb(conn, skb, offset, offloaded);
1650 }
1651
1652 static void csk_return_rx_credits(struct cxgbi_sock *csk, int copied)
1653 {
1654         struct cxgbi_device *cdev = csk->cdev;
1655         int must_send;
1656         u32 credits;
1657
1658         log_debug(1 << CXGBI_DBG_PDU_RX,
1659                 "csk 0x%p,%u,0x%lx,%u, seq %u, wup %u, thre %u, %u.\n",
1660                 csk, csk->state, csk->flags, csk->tid, csk->copied_seq,
1661                 csk->rcv_wup, cdev->rx_credit_thres,
1662                 csk->rcv_win);
1663
1664         if (!cdev->rx_credit_thres)
1665                 return;
1666
1667         if (csk->state != CTP_ESTABLISHED)
1668                 return;
1669
1670         credits = csk->copied_seq - csk->rcv_wup;
1671         if (unlikely(!credits))
1672                 return;
1673         must_send = credits + 16384 >= csk->rcv_win;
1674         if (must_send || credits >= cdev->rx_credit_thres)
1675                 csk->rcv_wup += cdev->csk_send_rx_credits(csk, credits);
1676 }
1677
1678 void cxgbi_conn_pdu_ready(struct cxgbi_sock *csk)
1679 {
1680         struct cxgbi_device *cdev = csk->cdev;
1681         struct iscsi_conn *conn = csk->user_data;
1682         struct sk_buff *skb;
1683         unsigned int read = 0;
1684         int err = 0;
1685
1686         log_debug(1 << CXGBI_DBG_PDU_RX,
1687                 "csk 0x%p, conn 0x%p.\n", csk, conn);
1688
1689         if (unlikely(!conn || conn->suspend_rx)) {
1690                 log_debug(1 << CXGBI_DBG_PDU_RX,
1691                         "csk 0x%p, conn 0x%p, id %d, suspend_rx %lu!\n",
1692                         csk, conn, conn ? conn->id : 0xFF,
1693                         conn ? conn->suspend_rx : 0xFF);
1694                 return;
1695         }
1696
1697         while (!err) {
1698                 skb = skb_peek(&csk->receive_queue);
1699                 if (!skb ||
1700                     !(cxgbi_skcb_test_flag(skb, SKCBF_RX_STATUS))) {
1701                         if (skb)
1702                                 log_debug(1 << CXGBI_DBG_PDU_RX,
1703                                         "skb 0x%p, NOT ready 0x%lx.\n",
1704                                         skb, cxgbi_skcb_flags(skb));
1705                         break;
1706                 }
1707                 __skb_unlink(skb, &csk->receive_queue);
1708
1709                 read += cxgbi_skcb_rx_pdulen(skb);
1710                 log_debug(1 << CXGBI_DBG_PDU_RX,
1711                         "csk 0x%p, skb 0x%p,%u,f 0x%lx, pdu len %u.\n",
1712                         csk, skb, skb->len, cxgbi_skcb_flags(skb),
1713                         cxgbi_skcb_rx_pdulen(skb));
1714
1715                 if (cxgbi_skcb_test_flag(skb, SKCBF_RX_COALESCED)) {
1716                         err = skb_read_pdu_bhs(conn, skb);
1717                         if (err < 0) {
1718                                 pr_err("coalesced bhs, csk 0x%p, skb 0x%p,%u, "
1719                                         "f 0x%lx, plen %u.\n",
1720                                         csk, skb, skb->len,
1721                                         cxgbi_skcb_flags(skb),
1722                                         cxgbi_skcb_rx_pdulen(skb));
1723                                 goto skb_done;
1724                         }
1725                         err = skb_read_pdu_data(conn, skb, skb,
1726                                                 err + cdev->skb_rx_extra);
1727                         if (err < 0)
1728                                 pr_err("coalesced data, csk 0x%p, skb 0x%p,%u, "
1729                                         "f 0x%lx, plen %u.\n",
1730                                         csk, skb, skb->len,
1731                                         cxgbi_skcb_flags(skb),
1732                                         cxgbi_skcb_rx_pdulen(skb));
1733                 } else {
1734                         err = skb_read_pdu_bhs(conn, skb);
1735                         if (err < 0) {
1736                                 pr_err("bhs, csk 0x%p, skb 0x%p,%u, "
1737                                         "f 0x%lx, plen %u.\n",
1738                                         csk, skb, skb->len,
1739                                         cxgbi_skcb_flags(skb),
1740                                         cxgbi_skcb_rx_pdulen(skb));
1741                                 goto skb_done;
1742                         }
1743
1744                         if (cxgbi_skcb_test_flag(skb, SKCBF_RX_DATA)) {
1745                                 struct sk_buff *dskb;
1746
1747                                 dskb = skb_peek(&csk->receive_queue);
1748                                 if (!dskb) {
1749                                         pr_err("csk 0x%p, skb 0x%p,%u, f 0x%lx,"
1750                                                 " plen %u, NO data.\n",
1751                                                 csk, skb, skb->len,
1752                                                 cxgbi_skcb_flags(skb),
1753                                                 cxgbi_skcb_rx_pdulen(skb));
1754                                         err = -EIO;
1755                                         goto skb_done;
1756                                 }
1757                                 __skb_unlink(dskb, &csk->receive_queue);
1758
1759                                 err = skb_read_pdu_data(conn, skb, dskb, 0);
1760                                 if (err < 0)
1761                                         pr_err("data, csk 0x%p, skb 0x%p,%u, "
1762                                                 "f 0x%lx, plen %u, dskb 0x%p,"
1763                                                 "%u.\n",
1764                                                 csk, skb, skb->len,
1765                                                 cxgbi_skcb_flags(skb),
1766                                                 cxgbi_skcb_rx_pdulen(skb),
1767                                                 dskb, dskb->len);
1768                                 __kfree_skb(dskb);
1769                         } else
1770                                 err = skb_read_pdu_data(conn, skb, skb, 0);
1771                 }
1772 skb_done:
1773                 __kfree_skb(skb);
1774
1775                 if (err < 0)
1776                         break;
1777         }
1778
1779         log_debug(1 << CXGBI_DBG_PDU_RX, "csk 0x%p, read %u.\n", csk, read);
1780         if (read) {
1781                 csk->copied_seq += read;
1782                 csk_return_rx_credits(csk, read);
1783                 conn->rxdata_octets += read;
1784         }
1785
1786         if (err < 0) {
1787                 pr_info("csk 0x%p, 0x%p, rx failed %d, read %u.\n",
1788                         csk, conn, err, read);
1789                 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1790         }
1791 }
1792 EXPORT_SYMBOL_GPL(cxgbi_conn_pdu_ready);
1793
1794 static int sgl_seek_offset(struct scatterlist *sgl, unsigned int sgcnt,
1795                                 unsigned int offset, unsigned int *off,
1796                                 struct scatterlist **sgp)
1797 {
1798         int i;
1799         struct scatterlist *sg;
1800
1801         for_each_sg(sgl, sg, sgcnt, i) {
1802                 if (offset < sg->length) {
1803                         *off = offset;
1804                         *sgp = sg;
1805                         return 0;
1806                 }
1807                 offset -= sg->length;
1808         }
1809         return -EFAULT;
1810 }
1811
1812 static int sgl_read_to_frags(struct scatterlist *sg, unsigned int sgoffset,
1813                                 unsigned int dlen, struct page_frag *frags,
1814                                 int frag_max)
1815 {
1816         unsigned int datalen = dlen;
1817         unsigned int sglen = sg->length - sgoffset;
1818         struct page *page = sg_page(sg);
1819         int i;
1820
1821         i = 0;
1822         do {
1823                 unsigned int copy;
1824
1825                 if (!sglen) {
1826                         sg = sg_next(sg);
1827                         if (!sg) {
1828                                 pr_warn("sg %d NULL, len %u/%u.\n",
1829                                         i, datalen, dlen);
1830                                 return -EINVAL;
1831                         }
1832                         sgoffset = 0;
1833                         sglen = sg->length;
1834                         page = sg_page(sg);
1835
1836                 }
1837                 copy = min(datalen, sglen);
1838                 if (i && page == frags[i - 1].page &&
1839                     sgoffset + sg->offset ==
1840                         frags[i - 1].offset + frags[i - 1].size) {
1841                         frags[i - 1].size += copy;
1842                 } else {
1843                         if (i >= frag_max) {
1844                                 pr_warn("too many pages %u, dlen %u.\n",
1845                                         frag_max, dlen);
1846                                 return -EINVAL;
1847                         }
1848
1849                         frags[i].page = page;
1850                         frags[i].offset = sg->offset + sgoffset;
1851                         frags[i].size = copy;
1852                         i++;
1853                 }
1854                 datalen -= copy;
1855                 sgoffset += copy;
1856                 sglen -= copy;
1857         } while (datalen);
1858
1859         return i;
1860 }
1861
1862 int cxgbi_conn_alloc_pdu(struct iscsi_task *task, u8 opcode)
1863 {
1864         struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
1865         struct cxgbi_conn *cconn = tcp_conn->dd_data;
1866         struct cxgbi_device *cdev = cconn->chba->cdev;
1867         struct iscsi_conn *conn = task->conn;
1868         struct iscsi_tcp_task *tcp_task = task->dd_data;
1869         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1870         struct scsi_cmnd *sc = task->sc;
1871         int headroom = SKB_TX_ISCSI_PDU_HEADER_MAX;
1872
1873         tcp_task->dd_data = tdata;
1874         task->hdr = NULL;
1875
1876         if (tdata->skb) {
1877                 kfree_skb(tdata->skb);
1878                 tdata->skb = NULL;
1879         }
1880
1881         if (SKB_MAX_HEAD(cdev->skb_tx_rsvd) > (512 * MAX_SKB_FRAGS) &&
1882             (opcode == ISCSI_OP_SCSI_DATA_OUT ||
1883              (opcode == ISCSI_OP_SCSI_CMD &&
1884               (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_TO_DEVICE))))
1885                 /* data could goes into skb head */
1886                 headroom += min_t(unsigned int,
1887                                 SKB_MAX_HEAD(cdev->skb_tx_rsvd),
1888                                 conn->max_xmit_dlength);
1889
1890         tdata->skb = alloc_skb(cdev->skb_tx_rsvd + headroom, GFP_ATOMIC);
1891         if (!tdata->skb) {
1892                 struct cxgbi_sock *csk = cconn->cep->csk;
1893                 struct net_device *ndev = cdev->ports[csk->port_id];
1894                 ndev->stats.tx_dropped++;
1895                 return -ENOMEM;
1896         }
1897
1898         skb_get(tdata->skb);
1899         skb_reserve(tdata->skb, cdev->skb_tx_rsvd);
1900         task->hdr = (struct iscsi_hdr *)tdata->skb->data;
1901         task->hdr_max = SKB_TX_ISCSI_PDU_HEADER_MAX; /* BHS + AHS */
1902
1903         /* data_out uses scsi_cmd's itt */
1904         if (opcode != ISCSI_OP_SCSI_DATA_OUT)
1905                 task_reserve_itt(task, &task->hdr->itt);
1906
1907         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
1908                 "task 0x%p, op 0x%x, skb 0x%p,%u+%u/%u, itt 0x%x.\n",
1909                 task, opcode, tdata->skb, cdev->skb_tx_rsvd, headroom,
1910                 conn->max_xmit_dlength, ntohl(task->hdr->itt));
1911
1912         return 0;
1913 }
1914 EXPORT_SYMBOL_GPL(cxgbi_conn_alloc_pdu);
1915
1916 static inline void tx_skb_setmode(struct sk_buff *skb, int hcrc, int dcrc)
1917 {
1918         if (hcrc || dcrc) {
1919                 u8 submode = 0;
1920
1921                 if (hcrc)
1922                         submode |= 1;
1923                 if (dcrc)
1924                         submode |= 2;
1925                 cxgbi_skcb_ulp_mode(skb) = (ULP2_MODE_ISCSI << 4) | submode;
1926         } else
1927                 cxgbi_skcb_ulp_mode(skb) = 0;
1928 }
1929
1930 int cxgbi_conn_init_pdu(struct iscsi_task *task, unsigned int offset,
1931                               unsigned int count)
1932 {
1933         struct iscsi_conn *conn = task->conn;
1934         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1935         struct sk_buff *skb = tdata->skb;
1936         unsigned int datalen = count;
1937         int i, padlen = iscsi_padding(count);
1938         struct page *pg;
1939
1940         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
1941                 "task 0x%p,0x%p, skb 0x%p, 0x%x,0x%x,0x%x, %u+%u.\n",
1942                 task, task->sc, skb, (*skb->data) & ISCSI_OPCODE_MASK,
1943                 ntohl(task->cmdsn), ntohl(task->hdr->itt), offset, count);
1944
1945         skb_put(skb, task->hdr_len);
1946         tx_skb_setmode(skb, conn->hdrdgst_en, datalen ? conn->datadgst_en : 0);
1947         if (!count)
1948                 return 0;
1949
1950         if (task->sc) {
1951                 struct scsi_data_buffer *sdb = scsi_out(task->sc);
1952                 struct scatterlist *sg = NULL;
1953                 int err;
1954
1955                 tdata->offset = offset;
1956                 tdata->count = count;
1957                 err = sgl_seek_offset(
1958                                         sdb->table.sgl, sdb->table.nents,
1959                                         tdata->offset, &tdata->sgoffset, &sg);
1960                 if (err < 0) {
1961                         pr_warn("tpdu, sgl %u, bad offset %u/%u.\n",
1962                                 sdb->table.nents, tdata->offset, sdb->length);
1963                         return err;
1964                 }
1965                 err = sgl_read_to_frags(sg, tdata->sgoffset, tdata->count,
1966                                         tdata->frags, MAX_PDU_FRAGS);
1967                 if (err < 0) {
1968                         pr_warn("tpdu, sgl %u, bad offset %u + %u.\n",
1969                                 sdb->table.nents, tdata->offset, tdata->count);
1970                         return err;
1971                 }
1972                 tdata->nr_frags = err;
1973
1974                 if (tdata->nr_frags > MAX_SKB_FRAGS ||
1975                     (padlen && tdata->nr_frags == MAX_SKB_FRAGS)) {
1976                         char *dst = skb->data + task->hdr_len;
1977                         struct page_frag *frag = tdata->frags;
1978
1979                         /* data fits in the skb's headroom */
1980                         for (i = 0; i < tdata->nr_frags; i++, frag++) {
1981                                 char *src = kmap_atomic(frag->page);
1982
1983                                 memcpy(dst, src+frag->offset, frag->size);
1984                                 dst += frag->size;
1985                                 kunmap_atomic(src);
1986                         }
1987                         if (padlen) {
1988                                 memset(dst, 0, padlen);
1989                                 padlen = 0;
1990                         }
1991                         skb_put(skb, count + padlen);
1992                 } else {
1993                         /* data fit into frag_list */
1994                         for (i = 0; i < tdata->nr_frags; i++) {
1995                                 __skb_fill_page_desc(skb, i,
1996                                                 tdata->frags[i].page,
1997                                                 tdata->frags[i].offset,
1998                                                 tdata->frags[i].size);
1999                                 skb_frag_ref(skb, i);
2000                         }
2001                         skb_shinfo(skb)->nr_frags = tdata->nr_frags;
2002                         skb->len += count;
2003                         skb->data_len += count;
2004                         skb->truesize += count;
2005                 }
2006
2007         } else {
2008                 pg = virt_to_page(task->data);
2009
2010                 get_page(pg);
2011                 skb_fill_page_desc(skb, 0, pg, offset_in_page(task->data),
2012                                         count);
2013                 skb->len += count;
2014                 skb->data_len += count;
2015                 skb->truesize += count;
2016         }
2017
2018         if (padlen) {
2019                 i = skb_shinfo(skb)->nr_frags;
2020                 skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags,
2021                                 virt_to_page(padding), offset_in_page(padding),
2022                                 padlen);
2023
2024                 skb->data_len += padlen;
2025                 skb->truesize += padlen;
2026                 skb->len += padlen;
2027         }
2028
2029         return 0;
2030 }
2031 EXPORT_SYMBOL_GPL(cxgbi_conn_init_pdu);
2032
2033 int cxgbi_conn_xmit_pdu(struct iscsi_task *task)
2034 {
2035         struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
2036         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2037         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2038         struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
2039         struct sk_buff *skb = tdata->skb;
2040         struct cxgbi_sock *csk = NULL;
2041         unsigned int datalen;
2042         int err;
2043
2044         if (!skb || cxgbi_skcb_test_flag(skb, SKCBF_TX_DONE)) {
2045                 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2046                         "task 0x%p, skb 0x%p\n", task, skb);
2047                 return 0;
2048         }
2049
2050         if (cconn && cconn->cep)
2051                 csk = cconn->cep->csk;
2052         if (!csk) {
2053                 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2054                           "task 0x%p, csk gone.\n", task);
2055                 return -EPIPE;
2056         }
2057
2058         datalen = skb->data_len;
2059
2060         /* write ppod first if using ofldq to write ppod */
2061         if (ttinfo->flags & CXGBI_PPOD_INFO_FLAG_VALID) {
2062                 struct cxgbi_ppm *ppm = csk->cdev->cdev2ppm(csk->cdev);
2063
2064                 ttinfo->flags &= ~CXGBI_PPOD_INFO_FLAG_VALID;
2065                 if (csk->cdev->csk_ddp_set_map(ppm, csk, ttinfo) < 0)
2066                         pr_err("task 0x%p, ppod writing using ofldq failed.\n",
2067                                task);
2068                         /* continue. Let fl get the data */
2069         }
2070
2071         err = cxgbi_sock_send_pdus(cconn->cep->csk, skb);
2072         if (err > 0) {
2073                 int pdulen = err;
2074
2075                 log_debug(1 << CXGBI_DBG_PDU_TX,
2076                         "task 0x%p,0x%p, skb 0x%p, len %u/%u, rv %d.\n",
2077                         task, task->sc, skb, skb->len, skb->data_len, err);
2078
2079                 if (task->conn->hdrdgst_en)
2080                         pdulen += ISCSI_DIGEST_SIZE;
2081
2082                 if (datalen && task->conn->datadgst_en)
2083                         pdulen += ISCSI_DIGEST_SIZE;
2084
2085                 task->conn->txdata_octets += pdulen;
2086                 cxgbi_skcb_set_flag(skb, SKCBF_TX_DONE);
2087                 return 0;
2088         }
2089
2090         if (err == -EAGAIN || err == -ENOBUFS) {
2091                 log_debug(1 << CXGBI_DBG_PDU_TX,
2092                         "task 0x%p, skb 0x%p, len %u/%u, %d EAGAIN.\n",
2093                         task, skb, skb->len, skb->data_len, err);
2094                 /* reset skb to send when we are called again */
2095                 return err;
2096         }
2097
2098         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2099                 "itt 0x%x, skb 0x%p, len %u/%u, xmit err %d.\n",
2100                 task->itt, skb, skb->len, skb->data_len, err);
2101
2102         __kfree_skb(tdata->skb);
2103         tdata->skb = NULL;
2104
2105         iscsi_conn_printk(KERN_ERR, task->conn, "xmit err %d.\n", err);
2106         iscsi_conn_failure(task->conn, ISCSI_ERR_XMIT_FAILED);
2107         return err;
2108 }
2109 EXPORT_SYMBOL_GPL(cxgbi_conn_xmit_pdu);
2110
2111 void cxgbi_cleanup_task(struct iscsi_task *task)
2112 {
2113         struct iscsi_tcp_task *tcp_task = task->dd_data;
2114         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2115
2116         log_debug(1 << CXGBI_DBG_ISCSI,
2117                 "task 0x%p, skb 0x%p, itt 0x%x.\n",
2118                 task, tdata->skb, task->hdr_itt);
2119
2120         tcp_task->dd_data = NULL;
2121         /*  never reached the xmit task callout */
2122         if (tdata->skb) {
2123                 kfree_skb(tdata->skb);
2124                 tdata->skb = NULL;
2125         }
2126
2127         task_release_itt(task, task->hdr_itt);
2128         memset(tdata, 0, sizeof(*tdata));
2129
2130         iscsi_tcp_cleanup_task(task);
2131 }
2132 EXPORT_SYMBOL_GPL(cxgbi_cleanup_task);
2133
2134 void cxgbi_get_conn_stats(struct iscsi_cls_conn *cls_conn,
2135                                 struct iscsi_stats *stats)
2136 {
2137         struct iscsi_conn *conn = cls_conn->dd_data;
2138
2139         stats->txdata_octets = conn->txdata_octets;
2140         stats->rxdata_octets = conn->rxdata_octets;
2141         stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
2142         stats->dataout_pdus = conn->dataout_pdus_cnt;
2143         stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
2144         stats->datain_pdus = conn->datain_pdus_cnt;
2145         stats->r2t_pdus = conn->r2t_pdus_cnt;
2146         stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
2147         stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
2148         stats->digest_err = 0;
2149         stats->timeout_err = 0;
2150         stats->custom_length = 1;
2151         strcpy(stats->custom[0].desc, "eh_abort_cnt");
2152         stats->custom[0].value = conn->eh_abort_cnt;
2153 }
2154 EXPORT_SYMBOL_GPL(cxgbi_get_conn_stats);
2155
2156 static int cxgbi_conn_max_xmit_dlength(struct iscsi_conn *conn)
2157 {
2158         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2159         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2160         struct cxgbi_device *cdev = cconn->chba->cdev;
2161         unsigned int headroom = SKB_MAX_HEAD(cdev->skb_tx_rsvd);
2162         unsigned int max_def = 512 * MAX_SKB_FRAGS;
2163         unsigned int max = max(max_def, headroom);
2164
2165         max = min(cconn->chba->cdev->tx_max_size, max);
2166         if (conn->max_xmit_dlength)
2167                 conn->max_xmit_dlength = min(conn->max_xmit_dlength, max);
2168         else
2169                 conn->max_xmit_dlength = max;
2170         cxgbi_align_pdu_size(conn->max_xmit_dlength);
2171
2172         return 0;
2173 }
2174
2175 static int cxgbi_conn_max_recv_dlength(struct iscsi_conn *conn)
2176 {
2177         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2178         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2179         unsigned int max = cconn->chba->cdev->rx_max_size;
2180
2181         cxgbi_align_pdu_size(max);
2182
2183         if (conn->max_recv_dlength) {
2184                 if (conn->max_recv_dlength > max) {
2185                         pr_err("MaxRecvDataSegmentLength %u > %u.\n",
2186                                 conn->max_recv_dlength, max);
2187                         return -EINVAL;
2188                 }
2189                 conn->max_recv_dlength = min(conn->max_recv_dlength, max);
2190                 cxgbi_align_pdu_size(conn->max_recv_dlength);
2191         } else
2192                 conn->max_recv_dlength = max;
2193
2194         return 0;
2195 }
2196
2197 int cxgbi_set_conn_param(struct iscsi_cls_conn *cls_conn,
2198                         enum iscsi_param param, char *buf, int buflen)
2199 {
2200         struct iscsi_conn *conn = cls_conn->dd_data;
2201         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2202         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2203         struct cxgbi_sock *csk = cconn->cep->csk;
2204         int err;
2205
2206         log_debug(1 << CXGBI_DBG_ISCSI,
2207                 "cls_conn 0x%p, param %d, buf(%d) %s.\n",
2208                 cls_conn, param, buflen, buf);
2209
2210         switch (param) {
2211         case ISCSI_PARAM_HDRDGST_EN:
2212                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2213                 if (!err && conn->hdrdgst_en)
2214                         err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2215                                                         conn->hdrdgst_en,
2216                                                         conn->datadgst_en, 0);
2217                 break;
2218         case ISCSI_PARAM_DATADGST_EN:
2219                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2220                 if (!err && conn->datadgst_en)
2221                         err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2222                                                         conn->hdrdgst_en,
2223                                                         conn->datadgst_en, 0);
2224                 break;
2225         case ISCSI_PARAM_MAX_R2T:
2226                 return iscsi_tcp_set_max_r2t(conn, buf);
2227         case ISCSI_PARAM_MAX_RECV_DLENGTH:
2228                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2229                 if (!err)
2230                         err = cxgbi_conn_max_recv_dlength(conn);
2231                 break;
2232         case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2233                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2234                 if (!err)
2235                         err = cxgbi_conn_max_xmit_dlength(conn);
2236                 break;
2237         default:
2238                 return iscsi_set_param(cls_conn, param, buf, buflen);
2239         }
2240         return err;
2241 }
2242 EXPORT_SYMBOL_GPL(cxgbi_set_conn_param);
2243
2244 static inline int csk_print_port(struct cxgbi_sock *csk, char *buf)
2245 {
2246         int len;
2247
2248         cxgbi_sock_get(csk);
2249         len = sprintf(buf, "%hu\n", ntohs(csk->daddr.sin_port));
2250         cxgbi_sock_put(csk);
2251
2252         return len;
2253 }
2254
2255 static inline int csk_print_ip(struct cxgbi_sock *csk, char *buf)
2256 {
2257         int len;
2258
2259         cxgbi_sock_get(csk);
2260         if (csk->csk_family == AF_INET)
2261                 len = sprintf(buf, "%pI4",
2262                               &csk->daddr.sin_addr.s_addr);
2263         else
2264                 len = sprintf(buf, "%pI6",
2265                               &csk->daddr6.sin6_addr);
2266
2267         cxgbi_sock_put(csk);
2268
2269         return len;
2270 }
2271
2272 int cxgbi_get_ep_param(struct iscsi_endpoint *ep, enum iscsi_param param,
2273                        char *buf)
2274 {
2275         struct cxgbi_endpoint *cep = ep->dd_data;
2276         struct cxgbi_sock *csk;
2277         int len;
2278
2279         log_debug(1 << CXGBI_DBG_ISCSI,
2280                 "cls_conn 0x%p, param %d.\n", ep, param);
2281
2282         switch (param) {
2283         case ISCSI_PARAM_CONN_PORT:
2284         case ISCSI_PARAM_CONN_ADDRESS:
2285                 if (!cep)
2286                         return -ENOTCONN;
2287
2288                 csk = cep->csk;
2289                 if (!csk)
2290                         return -ENOTCONN;
2291
2292                 return iscsi_conn_get_addr_param((struct sockaddr_storage *)
2293                                                  &csk->daddr, param, buf);
2294         default:
2295                 return -ENOSYS;
2296         }
2297         return len;
2298 }
2299 EXPORT_SYMBOL_GPL(cxgbi_get_ep_param);
2300
2301 struct iscsi_cls_conn *
2302 cxgbi_create_conn(struct iscsi_cls_session *cls_session, u32 cid)
2303 {
2304         struct iscsi_cls_conn *cls_conn;
2305         struct iscsi_conn *conn;
2306         struct iscsi_tcp_conn *tcp_conn;
2307         struct cxgbi_conn *cconn;
2308
2309         cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*cconn), cid);
2310         if (!cls_conn)
2311                 return NULL;
2312
2313         conn = cls_conn->dd_data;
2314         tcp_conn = conn->dd_data;
2315         cconn = tcp_conn->dd_data;
2316         cconn->iconn = conn;
2317
2318         log_debug(1 << CXGBI_DBG_ISCSI,
2319                 "cid %u(0x%x), cls 0x%p,0x%p, conn 0x%p,0x%p,0x%p.\n",
2320                 cid, cid, cls_session, cls_conn, conn, tcp_conn, cconn);
2321
2322         return cls_conn;
2323 }
2324 EXPORT_SYMBOL_GPL(cxgbi_create_conn);
2325
2326 int cxgbi_bind_conn(struct iscsi_cls_session *cls_session,
2327                                 struct iscsi_cls_conn *cls_conn,
2328                                 u64 transport_eph, int is_leading)
2329 {
2330         struct iscsi_conn *conn = cls_conn->dd_data;
2331         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2332         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2333         struct cxgbi_ppm *ppm;
2334         struct iscsi_endpoint *ep;
2335         struct cxgbi_endpoint *cep;
2336         struct cxgbi_sock *csk;
2337         int err;
2338
2339         ep = iscsi_lookup_endpoint(transport_eph);
2340         if (!ep)
2341                 return -EINVAL;
2342
2343         /*  setup ddp pagesize */
2344         cep = ep->dd_data;
2345         csk = cep->csk;
2346
2347         ppm = csk->cdev->cdev2ppm(csk->cdev);
2348         err = csk->cdev->csk_ddp_setup_pgidx(csk, csk->tid,
2349                                              ppm->tformat.pgsz_idx_dflt, 0);
2350         if (err < 0)
2351                 return err;
2352
2353         err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
2354         if (err)
2355                 return -EINVAL;
2356
2357         /*  calculate the tag idx bits needed for this conn based on cmds_max */
2358         cconn->task_idx_bits = (__ilog2_u32(conn->session->cmds_max - 1)) + 1;
2359
2360         write_lock_bh(&csk->callback_lock);
2361         csk->user_data = conn;
2362         cconn->chba = cep->chba;
2363         cconn->cep = cep;
2364         cep->cconn = cconn;
2365         write_unlock_bh(&csk->callback_lock);
2366
2367         cxgbi_conn_max_xmit_dlength(conn);
2368         cxgbi_conn_max_recv_dlength(conn);
2369
2370         log_debug(1 << CXGBI_DBG_ISCSI,
2371                 "cls 0x%p,0x%p, ep 0x%p, cconn 0x%p, csk 0x%p.\n",
2372                 cls_session, cls_conn, ep, cconn, csk);
2373         /*  init recv engine */
2374         iscsi_tcp_hdr_recv_prep(tcp_conn);
2375
2376         return 0;
2377 }
2378 EXPORT_SYMBOL_GPL(cxgbi_bind_conn);
2379
2380 struct iscsi_cls_session *cxgbi_create_session(struct iscsi_endpoint *ep,
2381                                                 u16 cmds_max, u16 qdepth,
2382                                                 u32 initial_cmdsn)
2383 {
2384         struct cxgbi_endpoint *cep;
2385         struct cxgbi_hba *chba;
2386         struct Scsi_Host *shost;
2387         struct iscsi_cls_session *cls_session;
2388         struct iscsi_session *session;
2389
2390         if (!ep) {
2391                 pr_err("missing endpoint.\n");
2392                 return NULL;
2393         }
2394
2395         cep = ep->dd_data;
2396         chba = cep->chba;
2397         shost = chba->shost;
2398
2399         BUG_ON(chba != iscsi_host_priv(shost));
2400
2401         cls_session = iscsi_session_setup(chba->cdev->itp, shost,
2402                                         cmds_max, 0,
2403                                         sizeof(struct iscsi_tcp_task) +
2404                                         sizeof(struct cxgbi_task_data),
2405                                         initial_cmdsn, ISCSI_MAX_TARGET);
2406         if (!cls_session)
2407                 return NULL;
2408
2409         session = cls_session->dd_data;
2410         if (iscsi_tcp_r2tpool_alloc(session))
2411                 goto remove_session;
2412
2413         log_debug(1 << CXGBI_DBG_ISCSI,
2414                 "ep 0x%p, cls sess 0x%p.\n", ep, cls_session);
2415         return cls_session;
2416
2417 remove_session:
2418         iscsi_session_teardown(cls_session);
2419         return NULL;
2420 }
2421 EXPORT_SYMBOL_GPL(cxgbi_create_session);
2422
2423 void cxgbi_destroy_session(struct iscsi_cls_session *cls_session)
2424 {
2425         log_debug(1 << CXGBI_DBG_ISCSI,
2426                 "cls sess 0x%p.\n", cls_session);
2427
2428         iscsi_tcp_r2tpool_free(cls_session->dd_data);
2429         iscsi_session_teardown(cls_session);
2430 }
2431 EXPORT_SYMBOL_GPL(cxgbi_destroy_session);
2432
2433 int cxgbi_set_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2434                         char *buf, int buflen)
2435 {
2436         struct cxgbi_hba *chba = iscsi_host_priv(shost);
2437
2438         if (!chba->ndev) {
2439                 shost_printk(KERN_ERR, shost, "Could not get host param. "
2440                                 "netdev for host not set.\n");
2441                 return -ENODEV;
2442         }
2443
2444         log_debug(1 << CXGBI_DBG_ISCSI,
2445                 "shost 0x%p, hba 0x%p,%s, param %d, buf(%d) %s.\n",
2446                 shost, chba, chba->ndev->name, param, buflen, buf);
2447
2448         switch (param) {
2449         case ISCSI_HOST_PARAM_IPADDRESS:
2450         {
2451                 __be32 addr = in_aton(buf);
2452                 log_debug(1 << CXGBI_DBG_ISCSI,
2453                         "hba %s, req. ipv4 %pI4.\n", chba->ndev->name, &addr);
2454                 cxgbi_set_iscsi_ipv4(chba, addr);
2455                 return 0;
2456         }
2457         case ISCSI_HOST_PARAM_HWADDRESS:
2458         case ISCSI_HOST_PARAM_NETDEV_NAME:
2459                 return 0;
2460         default:
2461                 return iscsi_host_set_param(shost, param, buf, buflen);
2462         }
2463 }
2464 EXPORT_SYMBOL_GPL(cxgbi_set_host_param);
2465
2466 int cxgbi_get_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2467                         char *buf)
2468 {
2469         struct cxgbi_hba *chba = iscsi_host_priv(shost);
2470         int len = 0;
2471
2472         if (!chba->ndev) {
2473                 shost_printk(KERN_ERR, shost, "Could not get host param. "
2474                                 "netdev for host not set.\n");
2475                 return -ENODEV;
2476         }
2477
2478         log_debug(1 << CXGBI_DBG_ISCSI,
2479                 "shost 0x%p, hba 0x%p,%s, param %d.\n",
2480                 shost, chba, chba->ndev->name, param);
2481
2482         switch (param) {
2483         case ISCSI_HOST_PARAM_HWADDRESS:
2484                 len = sysfs_format_mac(buf, chba->ndev->dev_addr, 6);
2485                 break;
2486         case ISCSI_HOST_PARAM_NETDEV_NAME:
2487                 len = sprintf(buf, "%s\n", chba->ndev->name);
2488                 break;
2489         case ISCSI_HOST_PARAM_IPADDRESS:
2490         {
2491                 struct cxgbi_sock *csk = find_sock_on_port(chba->cdev,
2492                                                            chba->port_id);
2493                 if (csk) {
2494                         len = sprintf(buf, "%pIS",
2495                                       (struct sockaddr *)&csk->saddr);
2496                 }
2497                 log_debug(1 << CXGBI_DBG_ISCSI,
2498                           "hba %s, addr %s.\n", chba->ndev->name, buf);
2499                 break;
2500         }
2501         default:
2502                 return iscsi_host_get_param(shost, param, buf);
2503         }
2504
2505         return len;
2506 }
2507 EXPORT_SYMBOL_GPL(cxgbi_get_host_param);
2508
2509 struct iscsi_endpoint *cxgbi_ep_connect(struct Scsi_Host *shost,
2510                                         struct sockaddr *dst_addr,
2511                                         int non_blocking)
2512 {
2513         struct iscsi_endpoint *ep;
2514         struct cxgbi_endpoint *cep;
2515         struct cxgbi_hba *hba = NULL;
2516         struct cxgbi_sock *csk;
2517         int err = -EINVAL;
2518
2519         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2520                 "shost 0x%p, non_blocking %d, dst_addr 0x%p.\n",
2521                 shost, non_blocking, dst_addr);
2522
2523         if (shost) {
2524                 hba = iscsi_host_priv(shost);
2525                 if (!hba) {
2526                         pr_info("shost 0x%p, priv NULL.\n", shost);
2527                         goto err_out;
2528                 }
2529         }
2530
2531         if (dst_addr->sa_family == AF_INET) {
2532                 csk = cxgbi_check_route(dst_addr);
2533 #if IS_ENABLED(CONFIG_IPV6)
2534         } else if (dst_addr->sa_family == AF_INET6) {
2535                 csk = cxgbi_check_route6(dst_addr);
2536 #endif
2537         } else {
2538                 pr_info("address family 0x%x NOT supported.\n",
2539                         dst_addr->sa_family);
2540                 err = -EAFNOSUPPORT;
2541                 return (struct iscsi_endpoint *)ERR_PTR(err);
2542         }
2543
2544         if (IS_ERR(csk))
2545                 return (struct iscsi_endpoint *)csk;
2546         cxgbi_sock_get(csk);
2547
2548         if (!hba)
2549                 hba = csk->cdev->hbas[csk->port_id];
2550         else if (hba != csk->cdev->hbas[csk->port_id]) {
2551                 pr_info("Could not connect through requested host %u"
2552                         "hba 0x%p != 0x%p (%u).\n",
2553                         shost->host_no, hba,
2554                         csk->cdev->hbas[csk->port_id], csk->port_id);
2555                 err = -ENOSPC;
2556                 goto release_conn;
2557         }
2558
2559         err = sock_get_port(csk);
2560         if (err)
2561                 goto release_conn;
2562
2563         cxgbi_sock_set_state(csk, CTP_CONNECTING);
2564         err = csk->cdev->csk_init_act_open(csk);
2565         if (err)
2566                 goto release_conn;
2567
2568         if (cxgbi_sock_is_closing(csk)) {
2569                 err = -ENOSPC;
2570                 pr_info("csk 0x%p is closing.\n", csk);
2571                 goto release_conn;
2572         }
2573
2574         ep = iscsi_create_endpoint(sizeof(*cep));
2575         if (!ep) {
2576                 err = -ENOMEM;
2577                 pr_info("iscsi alloc ep, OOM.\n");
2578                 goto release_conn;
2579         }
2580
2581         cep = ep->dd_data;
2582         cep->csk = csk;
2583         cep->chba = hba;
2584
2585         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2586                 "ep 0x%p, cep 0x%p, csk 0x%p, hba 0x%p,%s.\n",
2587                 ep, cep, csk, hba, hba->ndev->name);
2588         return ep;
2589
2590 release_conn:
2591         cxgbi_sock_put(csk);
2592         cxgbi_sock_closed(csk);
2593 err_out:
2594         return ERR_PTR(err);
2595 }
2596 EXPORT_SYMBOL_GPL(cxgbi_ep_connect);
2597
2598 int cxgbi_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
2599 {
2600         struct cxgbi_endpoint *cep = ep->dd_data;
2601         struct cxgbi_sock *csk = cep->csk;
2602
2603         if (!cxgbi_sock_is_established(csk))
2604                 return 0;
2605         return 1;
2606 }
2607 EXPORT_SYMBOL_GPL(cxgbi_ep_poll);
2608
2609 void cxgbi_ep_disconnect(struct iscsi_endpoint *ep)
2610 {
2611         struct cxgbi_endpoint *cep = ep->dd_data;
2612         struct cxgbi_conn *cconn = cep->cconn;
2613         struct cxgbi_sock *csk = cep->csk;
2614
2615         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2616                 "ep 0x%p, cep 0x%p, cconn 0x%p, csk 0x%p,%u,0x%lx.\n",
2617                 ep, cep, cconn, csk, csk->state, csk->flags);
2618
2619         if (cconn && cconn->iconn) {
2620                 iscsi_suspend_tx(cconn->iconn);
2621                 write_lock_bh(&csk->callback_lock);
2622                 cep->csk->user_data = NULL;
2623                 cconn->cep = NULL;
2624                 write_unlock_bh(&csk->callback_lock);
2625         }
2626         iscsi_destroy_endpoint(ep);
2627
2628         if (likely(csk->state >= CTP_ESTABLISHED))
2629                 need_active_close(csk);
2630         else
2631                 cxgbi_sock_closed(csk);
2632
2633         cxgbi_sock_put(csk);
2634 }
2635 EXPORT_SYMBOL_GPL(cxgbi_ep_disconnect);
2636
2637 int cxgbi_iscsi_init(struct iscsi_transport *itp,
2638                         struct scsi_transport_template **stt)
2639 {
2640         *stt = iscsi_register_transport(itp);
2641         if (*stt == NULL) {
2642                 pr_err("unable to register %s transport 0x%p.\n",
2643                         itp->name, itp);
2644                 return -ENODEV;
2645         }
2646         log_debug(1 << CXGBI_DBG_ISCSI,
2647                 "%s, registered iscsi transport 0x%p.\n",
2648                 itp->name, stt);
2649         return 0;
2650 }
2651 EXPORT_SYMBOL_GPL(cxgbi_iscsi_init);
2652
2653 void cxgbi_iscsi_cleanup(struct iscsi_transport *itp,
2654                         struct scsi_transport_template **stt)
2655 {
2656         if (*stt) {
2657                 log_debug(1 << CXGBI_DBG_ISCSI,
2658                         "de-register transport 0x%p, %s, stt 0x%p.\n",
2659                         itp, itp->name, *stt);
2660                 *stt = NULL;
2661                 iscsi_unregister_transport(itp);
2662         }
2663 }
2664 EXPORT_SYMBOL_GPL(cxgbi_iscsi_cleanup);
2665
2666 umode_t cxgbi_attr_is_visible(int param_type, int param)
2667 {
2668         switch (param_type) {
2669         case ISCSI_HOST_PARAM:
2670                 switch (param) {
2671                 case ISCSI_HOST_PARAM_NETDEV_NAME:
2672                 case ISCSI_HOST_PARAM_HWADDRESS:
2673                 case ISCSI_HOST_PARAM_IPADDRESS:
2674                 case ISCSI_HOST_PARAM_INITIATOR_NAME:
2675                         return S_IRUGO;
2676                 default:
2677                         return 0;
2678                 }
2679         case ISCSI_PARAM:
2680                 switch (param) {
2681                 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2682                 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2683                 case ISCSI_PARAM_HDRDGST_EN:
2684                 case ISCSI_PARAM_DATADGST_EN:
2685                 case ISCSI_PARAM_CONN_ADDRESS:
2686                 case ISCSI_PARAM_CONN_PORT:
2687                 case ISCSI_PARAM_EXP_STATSN:
2688                 case ISCSI_PARAM_PERSISTENT_ADDRESS:
2689                 case ISCSI_PARAM_PERSISTENT_PORT:
2690                 case ISCSI_PARAM_PING_TMO:
2691                 case ISCSI_PARAM_RECV_TMO:
2692                 case ISCSI_PARAM_INITIAL_R2T_EN:
2693                 case ISCSI_PARAM_MAX_R2T:
2694                 case ISCSI_PARAM_IMM_DATA_EN:
2695                 case ISCSI_PARAM_FIRST_BURST:
2696                 case ISCSI_PARAM_MAX_BURST:
2697                 case ISCSI_PARAM_PDU_INORDER_EN:
2698                 case ISCSI_PARAM_DATASEQ_INORDER_EN:
2699                 case ISCSI_PARAM_ERL:
2700                 case ISCSI_PARAM_TARGET_NAME:
2701                 case ISCSI_PARAM_TPGT:
2702                 case ISCSI_PARAM_USERNAME:
2703                 case ISCSI_PARAM_PASSWORD:
2704                 case ISCSI_PARAM_USERNAME_IN:
2705                 case ISCSI_PARAM_PASSWORD_IN:
2706                 case ISCSI_PARAM_FAST_ABORT:
2707                 case ISCSI_PARAM_ABORT_TMO:
2708                 case ISCSI_PARAM_LU_RESET_TMO:
2709                 case ISCSI_PARAM_TGT_RESET_TMO:
2710                 case ISCSI_PARAM_IFACE_NAME:
2711                 case ISCSI_PARAM_INITIATOR_NAME:
2712                         return S_IRUGO;
2713                 default:
2714                         return 0;
2715                 }
2716         }
2717
2718         return 0;
2719 }
2720 EXPORT_SYMBOL_GPL(cxgbi_attr_is_visible);
2721
2722 static int __init libcxgbi_init_module(void)
2723 {
2724         pr_info("%s", version);
2725
2726         BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, cb) <
2727                      sizeof(struct cxgbi_skb_cb));
2728         return 0;
2729 }
2730
2731 static void __exit libcxgbi_exit_module(void)
2732 {
2733         cxgbi_device_unregister_all(0xFF);
2734         return;
2735 }
2736
2737 module_init(libcxgbi_init_module);
2738 module_exit(libcxgbi_exit_module);