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 int cxgbi_device_portmap_create(struct cxgbi_device *cdev, unsigned int base,
  68                                 unsigned int max_conn)
  69 {
  70         struct cxgbi_ports_map *pmap = &cdev->pmap;
  71
  72         pmap->port_csk = cxgbi_alloc_big_mem(max_conn *
  73                                              sizeof(struct cxgbi_sock *),
  74                                              GFP_KERNEL);
  75         if (!pmap->port_csk) {
  76                 pr_warn("cdev 0x%p, portmap OOM %u.\n", cdev, max_conn);
  77                 return -ENOMEM;
  78         }
  79
  80         pmap->max_connect = max_conn;
  81         pmap->sport_base = base;
  82         spin_lock_init(&pmap->lock);
  83         return 0;
  84 }
  85 EXPORT_SYMBOL_GPL(cxgbi_device_portmap_create);
  86
  87 void cxgbi_device_portmap_cleanup(struct cxgbi_device *cdev)
  88 {
  89         struct cxgbi_ports_map *pmap = &cdev->pmap;
  90         struct cxgbi_sock *csk;
  91         int i;
  92
  93         for (i = 0; i < pmap->max_connect; i++) {
  94                 if (pmap->port_csk[i]) {
  95                         csk = pmap->port_csk[i];
  96                         pmap->port_csk[i] = NULL;
  97                         log_debug(1 << CXGBI_DBG_SOCK,
  98                                 "csk 0x%p, cdev 0x%p, offload down.\n",
  99                                 csk, cdev);
 100                         spin_lock_bh(&csk->lock);
 101                         cxgbi_sock_set_flag(csk, CTPF_OFFLOAD_DOWN);
 102                         cxgbi_sock_closed(csk);
 103                         spin_unlock_bh(&csk->lock);
 104                         cxgbi_sock_put(csk);
 105                 }
 106         }
 107 }
 108 EXPORT_SYMBOL_GPL(cxgbi_device_portmap_cleanup);
 109
 110 static inline void cxgbi_device_destroy(struct cxgbi_device *cdev)
 111 {
 112         log_debug(1 << CXGBI_DBG_DEV,
 113                 "cdev 0x%p, p# %u.\n", cdev, cdev->nports);
 114         cxgbi_hbas_remove(cdev);
 115         cxgbi_device_portmap_cleanup(cdev);
 116         if (cdev->dev_ddp_cleanup)
 117                 cdev->dev_ddp_cleanup(cdev);
 118         else
 119                 cxgbi_ddp_cleanup(cdev);
 120         if (cdev->ddp)
 121                 cxgbi_ddp_cleanup(cdev);
 122         if (cdev->pmap.max_connect)
 123                 cxgbi_free_big_mem(cdev->pmap.port_csk);
 124         kfree(cdev);
 125 }
 126
 127 struct cxgbi_device *cxgbi_device_register(unsigned int extra,
 128                                            unsigned int nports)
 129 {
 130         struct cxgbi_device *cdev;
 131
 132         cdev = kzalloc(sizeof(*cdev) + extra + nports *
 133                         (sizeof(struct cxgbi_hba *) +
 134                          sizeof(struct net_device *)),
 135                         GFP_KERNEL);
 136         if (!cdev) {
 137                 pr_warn("nport %d, OOM.\n", nports);
 138                 return NULL;
 139         }
 140         cdev->ports = (struct net_device **)(cdev + 1);
 141         cdev->hbas = (struct cxgbi_hba **)(((char*)cdev->ports) + nports *
 142                                                 sizeof(struct net_device *));
 143         if (extra)
 144                 cdev->dd_data = ((char *)cdev->hbas) +
 145                                 nports * sizeof(struct cxgbi_hba *);
 146         spin_lock_init(&cdev->pmap.lock);
 147
 148         mutex_lock(&cdev_mutex);
 149         list_add_tail(&cdev->list_head, &cdev_list);
 150         mutex_unlock(&cdev_mutex);
 151
 152         spin_lock(&cdev_rcu_lock);
 153         list_add_tail_rcu(&cdev->rcu_node, &cdev_rcu_list);
 154         spin_unlock(&cdev_rcu_lock);
 155
 156         log_debug(1 << CXGBI_DBG_DEV,
 157                 "cdev 0x%p, p# %u.\n", cdev, nports);
 158         return cdev;
 159 }
 160 EXPORT_SYMBOL_GPL(cxgbi_device_register);
 161
 162 void cxgbi_device_unregister(struct cxgbi_device *cdev)
 163 {
 164         log_debug(1 << CXGBI_DBG_DEV,
 165                 "cdev 0x%p, p# %u,%s.\n",
 166                 cdev, cdev->nports, cdev->nports ? cdev->ports[0]->name : "");
 167
 168         mutex_lock(&cdev_mutex);
 169         list_del(&cdev->list_head);
 170         mutex_unlock(&cdev_mutex);
 171
 172         spin_lock(&cdev_rcu_lock);
 173         list_del_rcu(&cdev->rcu_node);
 174         spin_unlock(&cdev_rcu_lock);
 175         synchronize_rcu();
 176
 177         cxgbi_device_destroy(cdev);
 178 }
 179 EXPORT_SYMBOL_GPL(cxgbi_device_unregister);
 180
 181 void cxgbi_device_unregister_all(unsigned int flag)
 182 {
 183         struct cxgbi_device *cdev, *tmp;
 184
 185         mutex_lock(&cdev_mutex);
 186         list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
 187                 if ((cdev->flags & flag) == flag) {
 188                         mutex_unlock(&cdev_mutex);
 189                         cxgbi_device_unregister(cdev);
 190                         mutex_lock(&cdev_mutex);
 191                 }
 192         }
 193         mutex_unlock(&cdev_mutex);
 194 }
 195 EXPORT_SYMBOL_GPL(cxgbi_device_unregister_all);
 196
 197 struct cxgbi_device *cxgbi_device_find_by_lldev(void *lldev)
 198 {
 199         struct cxgbi_device *cdev, *tmp;
 200
 201         mutex_lock(&cdev_mutex);
 202         list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
 203                 if (cdev->lldev == lldev) {
 204                         mutex_unlock(&cdev_mutex);
 205                         return cdev;
 206                 }
 207         }
 208         mutex_unlock(&cdev_mutex);
 209
 210         log_debug(1 << CXGBI_DBG_DEV,
 211                 "lldev 0x%p, NO match found.\n", lldev);
 212         return NULL;
 213 }
 214 EXPORT_SYMBOL_GPL(cxgbi_device_find_by_lldev);
 215
 216 struct cxgbi_device *cxgbi_device_find_by_netdev(struct net_device *ndev,
 217                                                  int *port)
 218 {
 219         struct net_device *vdev = NULL;
 220         struct cxgbi_device *cdev, *tmp;
 221         int i;
 222
 223         if (ndev->priv_flags & IFF_802_1Q_VLAN) {
 224                 vdev = ndev;
 225                 ndev = vlan_dev_real_dev(ndev);
 226                 log_debug(1 << CXGBI_DBG_DEV,
 227                         "vlan dev %s -> %s.\n", vdev->name, ndev->name);
 228         }
 229
 230         mutex_lock(&cdev_mutex);
 231         list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
 232                 for (i = 0; i < cdev->nports; i++) {
 233                         if (ndev == cdev->ports[i]) {
 234                                 cdev->hbas[i]->vdev = vdev;
 235                                 mutex_unlock(&cdev_mutex);
 236                                 if (port)
 237                                         *port = i;
 238                                 return cdev;
 239                         }
 240                 }
 241         }
 242         mutex_unlock(&cdev_mutex);
 243         log_debug(1 << CXGBI_DBG_DEV,
 244                 "ndev 0x%p, %s, NO match found.\n", ndev, ndev->name);
 245         return NULL;
 246 }
 247 EXPORT_SYMBOL_GPL(cxgbi_device_find_by_netdev);
 248
 249 struct cxgbi_device *cxgbi_device_find_by_netdev_rcu(struct net_device *ndev,
 250                                                      int *port)
 251 {
 252         struct net_device *vdev = NULL;
 253         struct cxgbi_device *cdev;
 254         int i;
 255
 256         if (ndev->priv_flags & IFF_802_1Q_VLAN) {
 257                 vdev = ndev;
 258                 ndev = vlan_dev_real_dev(ndev);
 259                 pr_info("vlan dev %s -> %s.\n", vdev->name, ndev->name);
 260         }
 261
 262         rcu_read_lock();
 263         list_for_each_entry_rcu(cdev, &cdev_rcu_list, rcu_node) {
 264                 for (i = 0; i < cdev->nports; i++) {
 265                         if (ndev == cdev->ports[i]) {
 266                                 cdev->hbas[i]->vdev = vdev;
 267                                 rcu_read_unlock();
 268                                 if (port)
 269                                         *port = i;
 270                                 return cdev;
 271                         }
 272                 }
 273         }
 274         rcu_read_unlock();
 275
 276         log_debug(1 << CXGBI_DBG_DEV,
 277                   "ndev 0x%p, %s, NO match found.\n", ndev, ndev->name);
 278         return NULL;
 279 }
 280 EXPORT_SYMBOL_GPL(cxgbi_device_find_by_netdev_rcu);
 281
 282 #if IS_ENABLED(CONFIG_IPV6)
 283 static struct cxgbi_device *cxgbi_device_find_by_mac(struct net_device *ndev,
 284                                                      int *port)
 285 {
 286         struct net_device *vdev = NULL;
 287         struct cxgbi_device *cdev, *tmp;
 288         int i;
 289
 290         if (ndev->priv_flags & IFF_802_1Q_VLAN) {
 291                 vdev = ndev;
 292                 ndev = vlan_dev_real_dev(ndev);
 293                 pr_info("vlan dev %s -> %s.\n", vdev->name, ndev->name);
 294         }
 295
 296         mutex_lock(&cdev_mutex);
 297         list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
 298                 for (i = 0; i < cdev->nports; i++) {
 299                         if (!memcmp(ndev->dev_addr, cdev->ports[i]->dev_addr,
 300                                     MAX_ADDR_LEN)) {
 301                                 cdev->hbas[i]->vdev = vdev;
 302                                 mutex_unlock(&cdev_mutex);
 303                                 if (port)
 304                                         *port = i;
 305                                 return cdev;
 306                         }
 307                 }
 308         }
 309         mutex_unlock(&cdev_mutex);
 310         log_debug(1 << CXGBI_DBG_DEV,
 311                   "ndev 0x%p, %s, NO match mac found.\n",
 312                   ndev, ndev->name);
 313         return NULL;
 314 }
 315 #endif
 316
 317 void cxgbi_hbas_remove(struct cxgbi_device *cdev)
 318 {
 319         int i;
 320         struct cxgbi_hba *chba;
 321
 322         log_debug(1 << CXGBI_DBG_DEV,
 323                 "cdev 0x%p, p#%u.\n", cdev, cdev->nports);
 324
 325         for (i = 0; i < cdev->nports; i++) {
 326                 chba = cdev->hbas[i];
 327                 if (chba) {
 328                         cdev->hbas[i] = NULL;
 329                         iscsi_host_remove(chba->shost);
 330                         pci_dev_put(cdev->pdev);
 331                         iscsi_host_free(chba->shost);
 332                 }
 333         }
 334 }
 335 EXPORT_SYMBOL_GPL(cxgbi_hbas_remove);
 336
 337 int cxgbi_hbas_add(struct cxgbi_device *cdev, u64 max_lun,
 338                 unsigned int max_id, struct scsi_host_template *sht,
 339                 struct scsi_transport_template *stt)
 340 {
 341         struct cxgbi_hba *chba;
 342         struct Scsi_Host *shost;
 343         int i, err;
 344
 345         log_debug(1 << CXGBI_DBG_DEV, "cdev 0x%p, p#%u.\n", cdev, cdev->nports);
 346
 347         for (i = 0; i < cdev->nports; i++) {
 348                 shost = iscsi_host_alloc(sht, sizeof(*chba), 1);
 349                 if (!shost) {
 350                         pr_info("0x%p, p%d, %s, host alloc failed.\n",
 351                                 cdev, i, cdev->ports[i]->name);
 352                         err = -ENOMEM;
 353                         goto err_out;
 354                 }
 355
 356                 shost->transportt = stt;
 357                 shost->max_lun = max_lun;
 358                 shost->max_id = max_id;
 359                 shost->max_channel = 0;
 360                 shost->max_cmd_len = 16;
 361
 362                 chba = iscsi_host_priv(shost);
 363                 chba->cdev = cdev;
 364                 chba->ndev = cdev->ports[i];
 365                 chba->shost = shost;
 366
 367                 log_debug(1 << CXGBI_DBG_DEV,
 368                         "cdev 0x%p, p#%d %s: chba 0x%p.\n",
 369                         cdev, i, cdev->ports[i]->name, chba);
 370
 371                 pci_dev_get(cdev->pdev);
 372                 err = iscsi_host_add(shost, &cdev->pdev->dev);
 373                 if (err) {
 374                         pr_info("cdev 0x%p, p#%d %s, host add failed.\n",
 375                                 cdev, i, cdev->ports[i]->name);
 376                         pci_dev_put(cdev->pdev);
 377                         scsi_host_put(shost);
 378                         goto  err_out;
 379                 }
 380
 381                 cdev->hbas[i] = chba;
 382         }
 383
 384         return 0;
 385
 386 err_out:
 387         cxgbi_hbas_remove(cdev);
 388         return err;
 389 }
 390 EXPORT_SYMBOL_GPL(cxgbi_hbas_add);
 391
 392 /*
 393  * iSCSI offload
 394  *
 395  * - source port management
 396  *   To find a free source port in the port allocation map we use a very simple
 397  *   rotor scheme to look for the next free port.
 398  *
 399  *   If a source port has been specified make sure that it doesn't collide with
 400  *   our normal source port allocation map.  If it's outside the range of our
 401  *   allocation/deallocation scheme just let them use it.
 402  *
 403  *   If the source port is outside our allocation range, the caller is
 404  *   responsible for keeping track of their port usage.
 405  */
 406
 407 static struct cxgbi_sock *find_sock_on_port(struct cxgbi_device *cdev,
 408                                             unsigned char port_id)
 409 {
 410         struct cxgbi_ports_map *pmap = &cdev->pmap;
 411         unsigned int i;
 412         unsigned int used;
 413
 414         if (!pmap->max_connect || !pmap->used)
 415                 return NULL;
 416
 417         spin_lock_bh(&pmap->lock);
 418         used = pmap->used;
 419         for (i = 0; used && i < pmap->max_connect; i++) {
 420                 struct cxgbi_sock *csk = pmap->port_csk[i];
 421
 422                 if (csk) {
 423                         if (csk->port_id == port_id) {
 424                                 spin_unlock_bh(&pmap->lock);
 425                                 return csk;
 426                         }
 427                         used--;
 428                 }
 429         }
 430         spin_unlock_bh(&pmap->lock);
 431
 432         return NULL;
 433 }
 434
 435 static int sock_get_port(struct cxgbi_sock *csk)
 436 {
 437         struct cxgbi_device *cdev = csk->cdev;
 438         struct cxgbi_ports_map *pmap = &cdev->pmap;
 439         unsigned int start;
 440         int idx;
 441         __be16 *port;
 442
 443         if (!pmap->max_connect) {
 444                 pr_err("cdev 0x%p, p#%u %s, NO port map.\n",
 445                            cdev, csk->port_id, cdev->ports[csk->port_id]->name);
 446                 return -EADDRNOTAVAIL;
 447         }
 448
 449         if (csk->csk_family == AF_INET)
 450                 port = &csk->saddr.sin_port;
 451         else /* ipv6 */
 452                 port = &csk->saddr6.sin6_port;
 453
 454         if (*port) {
 455                 pr_err("source port NON-ZERO %u.\n",
 456                         ntohs(*port));
 457                 return -EADDRINUSE;
 458         }
 459
 460         spin_lock_bh(&pmap->lock);
 461         if (pmap->used >= pmap->max_connect) {
 462                 spin_unlock_bh(&pmap->lock);
 463                 pr_info("cdev 0x%p, p#%u %s, ALL ports used.\n",
 464                         cdev, csk->port_id, cdev->ports[csk->port_id]->name);
 465                 return -EADDRNOTAVAIL;
 466         }
 467
 468         start = idx = pmap->next;
 469         do {
 470                 if (++idx >= pmap->max_connect)
 471                         idx = 0;
 472                 if (!pmap->port_csk[idx]) {
 473                         pmap->used++;
 474                         *port = htons(pmap->sport_base + idx);
 475                         pmap->next = idx;
 476                         pmap->port_csk[idx] = csk;
 477                         spin_unlock_bh(&pmap->lock);
 478                         cxgbi_sock_get(csk);
 479                         log_debug(1 << CXGBI_DBG_SOCK,
 480                                 "cdev 0x%p, p#%u %s, p %u, %u.\n",
 481                                 cdev, csk->port_id,
 482                                 cdev->ports[csk->port_id]->name,
 483                                 pmap->sport_base + idx, pmap->next);
 484                         return 0;
 485                 }
 486         } while (idx != start);
 487         spin_unlock_bh(&pmap->lock);
 488
 489         /* should not happen */
 490         pr_warn("cdev 0x%p, p#%u %s, next %u?\n",
 491                 cdev, csk->port_id, cdev->ports[csk->port_id]->name,
 492                 pmap->next);
 493         return -EADDRNOTAVAIL;
 494 }
 495
 496 static void sock_put_port(struct cxgbi_sock *csk)
 497 {
 498         struct cxgbi_device *cdev = csk->cdev;
 499         struct cxgbi_ports_map *pmap = &cdev->pmap;
 500         __be16 *port;
 501
 502         if (csk->csk_family == AF_INET)
 503                 port = &csk->saddr.sin_port;
 504         else /* ipv6 */
 505                 port = &csk->saddr6.sin6_port;
 506
 507         if (*port) {
 508                 int idx = ntohs(*port) - pmap->sport_base;
 509
 510                 *port = 0;
 511                 if (idx < 0 || idx >= pmap->max_connect) {
 512                         pr_err("cdev 0x%p, p#%u %s, port %u OOR.\n",
 513                                 cdev, csk->port_id,
 514                                 cdev->ports[csk->port_id]->name,
 515                                 ntohs(*port));
 516                         return;
 517                 }
 518
 519                 spin_lock_bh(&pmap->lock);
 520                 pmap->port_csk[idx] = NULL;
 521                 pmap->used--;
 522                 spin_unlock_bh(&pmap->lock);
 523
 524                 log_debug(1 << CXGBI_DBG_SOCK,
 525                         "cdev 0x%p, p#%u %s, release %u.\n",
 526                         cdev, csk->port_id, cdev->ports[csk->port_id]->name,
 527                         pmap->sport_base + idx);
 528
 529                 cxgbi_sock_put(csk);
 530         }
 531 }
 532
 533 /*
 534  * iscsi tcp connection
 535  */
 536 void cxgbi_sock_free_cpl_skbs(struct cxgbi_sock *csk)
 537 {
 538         if (csk->cpl_close) {
 539                 kfree_skb(csk->cpl_close);
 540                 csk->cpl_close = NULL;
 541         }
 542         if (csk->cpl_abort_req) {
 543                 kfree_skb(csk->cpl_abort_req);
 544                 csk->cpl_abort_req = NULL;
 545         }
 546         if (csk->cpl_abort_rpl) {
 547                 kfree_skb(csk->cpl_abort_rpl);
 548                 csk->cpl_abort_rpl = NULL;
 549         }
 550 }
 551 EXPORT_SYMBOL_GPL(cxgbi_sock_free_cpl_skbs);
 552
 553 static struct cxgbi_sock *cxgbi_sock_create(struct cxgbi_device *cdev)
 554 {
 555         struct cxgbi_sock *csk = kzalloc(sizeof(*csk), GFP_NOIO);
 556
 557         if (!csk) {
 558                 pr_info("alloc csk %zu failed.\n", sizeof(*csk));
 559                 return NULL;
 560         }
 561
 562         if (cdev->csk_alloc_cpls(csk) < 0) {
 563                 pr_info("csk 0x%p, alloc cpls failed.\n", csk);
 564                 kfree(csk);
 565                 return NULL;
 566         }
 567
 568         spin_lock_init(&csk->lock);
 569         kref_init(&csk->refcnt);
 570         skb_queue_head_init(&csk->receive_queue);
 571         skb_queue_head_init(&csk->write_queue);
 572         setup_timer(&csk->retry_timer, NULL, (unsigned long)csk);
 573         rwlock_init(&csk->callback_lock);
 574         csk->cdev = cdev;
 575         csk->flags = 0;
 576         cxgbi_sock_set_state(csk, CTP_CLOSED);
 577
 578         log_debug(1 << CXGBI_DBG_SOCK, "cdev 0x%p, new csk 0x%p.\n", cdev, csk);
 579
 580         return csk;
 581 }
 582
 583 static struct rtable *find_route_ipv4(struct flowi4 *fl4,
 584                                       __be32 saddr, __be32 daddr,
 585                                       __be16 sport, __be16 dport, u8 tos)
 586 {
 587         struct rtable *rt;
 588
 589         rt = ip_route_output_ports(&init_net, fl4, NULL, daddr, saddr,
 590                                    dport, sport, IPPROTO_TCP, tos, 0);
 591         if (IS_ERR(rt))
 592                 return NULL;
 593
 594         return rt;
 595 }
 596
 597 static struct cxgbi_sock *cxgbi_check_route(struct sockaddr *dst_addr)
 598 {
 599         struct sockaddr_in *daddr = (struct sockaddr_in *)dst_addr;
 600         struct dst_entry *dst;
 601         struct net_device *ndev;
 602         struct cxgbi_device *cdev;
 603         struct rtable *rt = NULL;
 604         struct neighbour *n;
 605         struct flowi4 fl4;
 606         struct cxgbi_sock *csk = NULL;
 607         unsigned int mtu = 0;
 608         int port = 0xFFFF;
 609         int err = 0;
 610
 611         rt = find_route_ipv4(&fl4, 0, daddr->sin_addr.s_addr, 0, daddr->sin_port, 0);
 612         if (!rt) {
 613                 pr_info("no route to ipv4 0x%x, port %u.\n",
 614                         be32_to_cpu(daddr->sin_addr.s_addr),
 615                         be16_to_cpu(daddr->sin_port));
 616                 err = -ENETUNREACH;
 617                 goto err_out;
 618         }
 619         dst = &rt->dst;
 620         n = dst_neigh_lookup(dst, &daddr->sin_addr.s_addr);
 621         if (!n) {
 622                 err = -ENODEV;
 623                 goto rel_rt;
 624         }
 625         ndev = n->dev;
 626
 627         if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) {
 628                 pr_info("multi-cast route %pI4, port %u, dev %s.\n",
 629                         &daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
 630                         ndev->name);
 631                 err = -ENETUNREACH;
 632                 goto rel_neigh;
 633         }
 634
 635         if (ndev->flags & IFF_LOOPBACK) {
 636                 ndev = ip_dev_find(&init_net, daddr->sin_addr.s_addr);
 637                 mtu = ndev->mtu;
 638                 pr_info("rt dev %s, loopback -> %s, mtu %u.\n",
 639                         n->dev->name, ndev->name, mtu);
 640         }
 641
 642         cdev = cxgbi_device_find_by_netdev(ndev, &port);
 643         if (!cdev) {
 644                 pr_info("dst %pI4, %s, NOT cxgbi device.\n",
 645                         &daddr->sin_addr.s_addr, ndev->name);
 646                 err = -ENETUNREACH;
 647                 goto rel_neigh;
 648         }
 649         log_debug(1 << CXGBI_DBG_SOCK,
 650                 "route to %pI4 :%u, ndev p#%d,%s, cdev 0x%p.\n",
 651                 &daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
 652                            port, ndev->name, cdev);
 653
 654         csk = cxgbi_sock_create(cdev);
 655         if (!csk) {
 656                 err = -ENOMEM;
 657                 goto rel_neigh;
 658         }
 659         csk->cdev = cdev;
 660         csk->port_id = port;
 661         csk->mtu = mtu;
 662         csk->dst = dst;
 663
 664         csk->csk_family = AF_INET;
 665         csk->daddr.sin_addr.s_addr = daddr->sin_addr.s_addr;
 666         csk->daddr.sin_port = daddr->sin_port;
 667         csk->daddr.sin_family = daddr->sin_family;
 668         csk->saddr.sin_family = daddr->sin_family;
 669         csk->saddr.sin_addr.s_addr = fl4.saddr;
 670         neigh_release(n);
 671
 672         return csk;
 673
 674 rel_neigh:
 675         neigh_release(n);
 676
 677 rel_rt:
 678         ip_rt_put(rt);
 679         if (csk)
 680                 cxgbi_sock_closed(csk);
 681 err_out:
 682         return ERR_PTR(err);
 683 }
 684
 685 #if IS_ENABLED(CONFIG_IPV6)
 686 static struct rt6_info *find_route_ipv6(const struct in6_addr *saddr,
 687                                         const struct in6_addr *daddr)
 688 {
 689         struct flowi6 fl;
 690
 691         memset(&fl, 0, sizeof(fl));
 692         if (saddr)
 693                 memcpy(&fl.saddr, saddr, sizeof(struct in6_addr));
 694         if (daddr)
 695                 memcpy(&fl.daddr, daddr, sizeof(struct in6_addr));
 696         return (struct rt6_info *)ip6_route_output(&init_net, NULL, &fl);
 697 }
 698
 699 static struct cxgbi_sock *cxgbi_check_route6(struct sockaddr *dst_addr)
 700 {
 701         struct sockaddr_in6 *daddr6 = (struct sockaddr_in6 *)dst_addr;
 702         struct dst_entry *dst;
 703         struct net_device *ndev;
 704         struct cxgbi_device *cdev;
 705         struct rt6_info *rt = NULL;
 706         struct neighbour *n;
 707         struct in6_addr pref_saddr;
 708         struct cxgbi_sock *csk = NULL;
 709         unsigned int mtu = 0;
 710         int port = 0xFFFF;
 711         int err = 0;
 712
 713         rt = find_route_ipv6(NULL, &daddr6->sin6_addr);
 714
 715         if (!rt) {
 716                 pr_info("no route to ipv6 %pI6 port %u\n",
 717                         daddr6->sin6_addr.s6_addr,
 718                         be16_to_cpu(daddr6->sin6_port));
 719                 err = -ENETUNREACH;
 720                 goto err_out;
 721         }
 722
 723         dst = &rt->dst;
 724
 725         n = dst_neigh_lookup(dst, &daddr6->sin6_addr);
 726
 727         if (!n) {
 728                 pr_info("%pI6, port %u, dst no neighbour.\n",
 729                         daddr6->sin6_addr.s6_addr,
 730                         be16_to_cpu(daddr6->sin6_port));
 731                 err = -ENETUNREACH;
 732                 goto rel_rt;
 733         }
 734         ndev = n->dev;
 735
 736         if (ipv6_addr_is_multicast(&daddr6->sin6_addr)) {
 737                 pr_info("multi-cast route %pI6 port %u, dev %s.\n",
 738                         daddr6->sin6_addr.s6_addr,
 739                         ntohs(daddr6->sin6_port), ndev->name);
 740                 err = -ENETUNREACH;
 741                 goto rel_rt;
 742         }
 743
 744         cdev = cxgbi_device_find_by_netdev(ndev, &port);
 745         if (!cdev)
 746                 cdev = cxgbi_device_find_by_mac(ndev, &port);
 747         if (!cdev) {
 748                 pr_info("dst %pI6 %s, NOT cxgbi device.\n",
 749                         daddr6->sin6_addr.s6_addr, ndev->name);
 750                 err = -ENETUNREACH;
 751                 goto rel_rt;
 752         }
 753         log_debug(1 << CXGBI_DBG_SOCK,
 754                   "route to %pI6 :%u, ndev p#%d,%s, cdev 0x%p.\n",
 755                   daddr6->sin6_addr.s6_addr, ntohs(daddr6->sin6_port), port,
 756                   ndev->name, cdev);
 757
 758         csk = cxgbi_sock_create(cdev);
 759         if (!csk) {
 760                 err = -ENOMEM;
 761                 goto rel_rt;
 762         }
 763         csk->cdev = cdev;
 764         csk->port_id = port;
 765         csk->mtu = mtu;
 766         csk->dst = dst;
 767
 768         if (ipv6_addr_any(&rt->rt6i_prefsrc.addr)) {
 769                 struct inet6_dev *idev = ip6_dst_idev((struct dst_entry *)rt);
 770
 771                 err = ipv6_dev_get_saddr(&init_net, idev ? idev->dev : NULL,
 772                                          &daddr6->sin6_addr, 0, &pref_saddr);
 773                 if (err) {
 774                         pr_info("failed to get source address to reach %pI6\n",
 775                                 &daddr6->sin6_addr);
 776                         goto rel_rt;
 777                 }
 778         } else {
 779                 pref_saddr = rt->rt6i_prefsrc.addr;
 780         }
 781
 782         csk->csk_family = AF_INET6;
 783         csk->daddr6.sin6_addr = daddr6->sin6_addr;
 784         csk->daddr6.sin6_port = daddr6->sin6_port;
 785         csk->daddr6.sin6_family = daddr6->sin6_family;
 786         csk->saddr6.sin6_family = daddr6->sin6_family;
 787         csk->saddr6.sin6_addr = pref_saddr;
 788
 789         neigh_release(n);
 790         return csk;
 791
 792 rel_rt:
 793         if (n)
 794                 neigh_release(n);
 795
 796         ip6_rt_put(rt);
 797         if (csk)
 798                 cxgbi_sock_closed(csk);
 799 err_out:
 800         return ERR_PTR(err);
 801 }
 802 #endif /* IS_ENABLED(CONFIG_IPV6) */
 803
 804 void cxgbi_sock_established(struct cxgbi_sock *csk, unsigned int snd_isn,
 805                         unsigned int opt)
 806 {
 807         csk->write_seq = csk->snd_nxt = csk->snd_una = snd_isn;
 808         dst_confirm(csk->dst);
 809         smp_mb();
 810         cxgbi_sock_set_state(csk, CTP_ESTABLISHED);
 811 }
 812 EXPORT_SYMBOL_GPL(cxgbi_sock_established);
 813
 814 static void cxgbi_inform_iscsi_conn_closing(struct cxgbi_sock *csk)
 815 {
 816         log_debug(1 << CXGBI_DBG_SOCK,
 817                 "csk 0x%p, state %u, flags 0x%lx, conn 0x%p.\n",
 818                 csk, csk->state, csk->flags, csk->user_data);
 819
 820         if (csk->state != CTP_ESTABLISHED) {
 821                 read_lock_bh(&csk->callback_lock);
 822                 if (csk->user_data)
 823                         iscsi_conn_failure(csk->user_data,
 824                                         ISCSI_ERR_TCP_CONN_CLOSE);
 825                 read_unlock_bh(&csk->callback_lock);
 826         }
 827 }
 828
 829 void cxgbi_sock_closed(struct cxgbi_sock *csk)
 830 {
 831         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 832                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 833         cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
 834         if (csk->state == CTP_ACTIVE_OPEN || csk->state == CTP_CLOSED)
 835                 return;
 836         if (csk->saddr.sin_port)
 837                 sock_put_port(csk);
 838         if (csk->dst)
 839                 dst_release(csk->dst);
 840         csk->cdev->csk_release_offload_resources(csk);
 841         cxgbi_sock_set_state(csk, CTP_CLOSED);
 842         cxgbi_inform_iscsi_conn_closing(csk);
 843         cxgbi_sock_put(csk);
 844 }
 845 EXPORT_SYMBOL_GPL(cxgbi_sock_closed);
 846
 847 static void need_active_close(struct cxgbi_sock *csk)
 848 {
 849         int data_lost;
 850         int close_req = 0;
 851
 852         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 853                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 854         spin_lock_bh(&csk->lock);
 855         dst_confirm(csk->dst);
 856         data_lost = skb_queue_len(&csk->receive_queue);
 857         __skb_queue_purge(&csk->receive_queue);
 858
 859         if (csk->state == CTP_ACTIVE_OPEN)
 860                 cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
 861         else if (csk->state == CTP_ESTABLISHED) {
 862                 close_req = 1;
 863                 cxgbi_sock_set_state(csk, CTP_ACTIVE_CLOSE);
 864         } else if (csk->state == CTP_PASSIVE_CLOSE) {
 865                 close_req = 1;
 866                 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
 867         }
 868
 869         if (close_req) {
 870                 if (data_lost)
 871                         csk->cdev->csk_send_abort_req(csk);
 872                 else
 873                         csk->cdev->csk_send_close_req(csk);
 874         }
 875
 876         spin_unlock_bh(&csk->lock);
 877 }
 878
 879 void cxgbi_sock_fail_act_open(struct cxgbi_sock *csk, int errno)
 880 {
 881         pr_info("csk 0x%p,%u,%lx, %pI4:%u-%pI4:%u, err %d.\n",
 882                         csk, csk->state, csk->flags,
 883                         &csk->saddr.sin_addr.s_addr, csk->saddr.sin_port,
 884                         &csk->daddr.sin_addr.s_addr, csk->daddr.sin_port,
 885                         errno);
 886
 887         cxgbi_sock_set_state(csk, CTP_CONNECTING);
 888         csk->err = errno;
 889         cxgbi_sock_closed(csk);
 890 }
 891 EXPORT_SYMBOL_GPL(cxgbi_sock_fail_act_open);
 892
 893 void cxgbi_sock_act_open_req_arp_failure(void *handle, struct sk_buff *skb)
 894 {
 895         struct cxgbi_sock *csk = (struct cxgbi_sock *)skb->sk;
 896
 897         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 898                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 899         cxgbi_sock_get(csk);
 900         spin_lock_bh(&csk->lock);
 901         if (csk->state == CTP_ACTIVE_OPEN)
 902                 cxgbi_sock_fail_act_open(csk, -EHOSTUNREACH);
 903         spin_unlock_bh(&csk->lock);
 904         cxgbi_sock_put(csk);
 905         __kfree_skb(skb);
 906 }
 907 EXPORT_SYMBOL_GPL(cxgbi_sock_act_open_req_arp_failure);
 908
 909 void cxgbi_sock_rcv_abort_rpl(struct cxgbi_sock *csk)
 910 {
 911         cxgbi_sock_get(csk);
 912         spin_lock_bh(&csk->lock);
 913
 914         cxgbi_sock_set_flag(csk, CTPF_ABORT_RPL_RCVD);
 915         if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING)) {
 916                 cxgbi_sock_clear_flag(csk, CTPF_ABORT_RPL_PENDING);
 917                 if (cxgbi_sock_flag(csk, CTPF_ABORT_REQ_RCVD))
 918                         pr_err("csk 0x%p,%u,0x%lx,%u,ABT_RPL_RSS.\n",
 919                                csk, csk->state, csk->flags, csk->tid);
 920                 cxgbi_sock_closed(csk);
 921         }
 922
 923         spin_unlock_bh(&csk->lock);
 924         cxgbi_sock_put(csk);
 925 }
 926 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_abort_rpl);
 927
 928 void cxgbi_sock_rcv_peer_close(struct cxgbi_sock *csk)
 929 {
 930         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 931                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 932         cxgbi_sock_get(csk);
 933         spin_lock_bh(&csk->lock);
 934
 935         if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
 936                 goto done;
 937
 938         switch (csk->state) {
 939         case CTP_ESTABLISHED:
 940                 cxgbi_sock_set_state(csk, CTP_PASSIVE_CLOSE);
 941                 break;
 942         case CTP_ACTIVE_CLOSE:
 943                 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
 944                 break;
 945         case CTP_CLOSE_WAIT_1:
 946                 cxgbi_sock_closed(csk);
 947                 break;
 948         case CTP_ABORTING:
 949                 break;
 950         default:
 951                 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
 952                         csk, csk->state, csk->flags, csk->tid);
 953         }
 954         cxgbi_inform_iscsi_conn_closing(csk);
 955 done:
 956         spin_unlock_bh(&csk->lock);
 957         cxgbi_sock_put(csk);
 958 }
 959 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_peer_close);
 960
 961 void cxgbi_sock_rcv_close_conn_rpl(struct cxgbi_sock *csk, u32 snd_nxt)
 962 {
 963         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 964                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 965         cxgbi_sock_get(csk);
 966         spin_lock_bh(&csk->lock);
 967
 968         csk->snd_una = snd_nxt - 1;
 969         if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
 970                 goto done;
 971
 972         switch (csk->state) {
 973         case CTP_ACTIVE_CLOSE:
 974                 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_1);
 975                 break;
 976         case CTP_CLOSE_WAIT_1:
 977         case CTP_CLOSE_WAIT_2:
 978                 cxgbi_sock_closed(csk);
 979                 break;
 980         case CTP_ABORTING:
 981                 break;
 982         default:
 983                 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
 984                         csk, csk->state, csk->flags, csk->tid);
 985         }
 986 done:
 987         spin_unlock_bh(&csk->lock);
 988         cxgbi_sock_put(csk);
 989 }
 990 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_close_conn_rpl);
 991
 992 void cxgbi_sock_rcv_wr_ack(struct cxgbi_sock *csk, unsigned int credits,
 993                            unsigned int snd_una, int seq_chk)
 994 {
 995         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 996                         "csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, snd_una %u,%d.\n",
 997                         csk, csk->state, csk->flags, csk->tid, credits,
 998                         csk->wr_cred, csk->wr_una_cred, snd_una, seq_chk);
 999
1000         spin_lock_bh(&csk->lock);
1001
1002         csk->wr_cred += credits;
1003         if (csk->wr_una_cred > csk->wr_max_cred - csk->wr_cred)
1004                 csk->wr_una_cred = csk->wr_max_cred - csk->wr_cred;
1005
1006         while (credits) {
1007                 struct sk_buff *p = cxgbi_sock_peek_wr(csk);
1008
1009                 if (unlikely(!p)) {
1010                         pr_err("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, empty.\n",
1011                                 csk, csk->state, csk->flags, csk->tid, credits,
1012                                 csk->wr_cred, csk->wr_una_cred);
1013                         break;
1014                 }
1015
1016                 if (unlikely(credits < p->csum)) {
1017                         pr_warn("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, < %u.\n",
1018                                 csk, csk->state, csk->flags, csk->tid,
1019                                 credits, csk->wr_cred, csk->wr_una_cred,
1020                                 p->csum);
1021                         p->csum -= credits;
1022                         break;
1023                 } else {
1024                         cxgbi_sock_dequeue_wr(csk);
1025                         credits -= p->csum;
1026                         kfree_skb(p);
1027                 }
1028         }
1029
1030         cxgbi_sock_check_wr_invariants(csk);
1031
1032         if (seq_chk) {
1033                 if (unlikely(before(snd_una, csk->snd_una))) {
1034                         pr_warn("csk 0x%p,%u,0x%lx,%u, snd_una %u/%u.",
1035                                 csk, csk->state, csk->flags, csk->tid, snd_una,
1036                                 csk->snd_una);
1037                         goto done;
1038                 }
1039
1040                 if (csk->snd_una != snd_una) {
1041                         csk->snd_una = snd_una;
1042                         dst_confirm(csk->dst);
1043                 }
1044         }
1045
1046         if (skb_queue_len(&csk->write_queue)) {
1047                 if (csk->cdev->csk_push_tx_frames(csk, 0))
1048                         cxgbi_conn_tx_open(csk);
1049         } else
1050                 cxgbi_conn_tx_open(csk);
1051 done:
1052         spin_unlock_bh(&csk->lock);
1053 }
1054 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_wr_ack);
1055
1056 static unsigned int cxgbi_sock_find_best_mtu(struct cxgbi_sock *csk,
1057                                              unsigned short mtu)
1058 {
1059         int i = 0;
1060
1061         while (i < csk->cdev->nmtus - 1 && csk->cdev->mtus[i + 1] <= mtu)
1062                 ++i;
1063
1064         return i;
1065 }
1066
1067 unsigned int cxgbi_sock_select_mss(struct cxgbi_sock *csk, unsigned int pmtu)
1068 {
1069         unsigned int idx;
1070         struct dst_entry *dst = csk->dst;
1071
1072         csk->advmss = dst_metric_advmss(dst);
1073
1074         if (csk->advmss > pmtu - 40)
1075                 csk->advmss = pmtu - 40;
1076         if (csk->advmss < csk->cdev->mtus[0] - 40)
1077                 csk->advmss = csk->cdev->mtus[0] - 40;
1078         idx = cxgbi_sock_find_best_mtu(csk, csk->advmss + 40);
1079
1080         return idx;
1081 }
1082 EXPORT_SYMBOL_GPL(cxgbi_sock_select_mss);
1083
1084 void cxgbi_sock_skb_entail(struct cxgbi_sock *csk, struct sk_buff *skb)
1085 {
1086         cxgbi_skcb_tcp_seq(skb) = csk->write_seq;
1087         __skb_queue_tail(&csk->write_queue, skb);
1088 }
1089 EXPORT_SYMBOL_GPL(cxgbi_sock_skb_entail);
1090
1091 void cxgbi_sock_purge_wr_queue(struct cxgbi_sock *csk)
1092 {
1093         struct sk_buff *skb;
1094
1095         while ((skb = cxgbi_sock_dequeue_wr(csk)) != NULL)
1096                 kfree_skb(skb);
1097 }
1098 EXPORT_SYMBOL_GPL(cxgbi_sock_purge_wr_queue);
1099
1100 void cxgbi_sock_check_wr_invariants(const struct cxgbi_sock *csk)
1101 {
1102         int pending = cxgbi_sock_count_pending_wrs(csk);
1103
1104         if (unlikely(csk->wr_cred + pending != csk->wr_max_cred))
1105                 pr_err("csk 0x%p, tid %u, credit %u + %u != %u.\n",
1106                         csk, csk->tid, csk->wr_cred, pending, csk->wr_max_cred);
1107 }
1108 EXPORT_SYMBOL_GPL(cxgbi_sock_check_wr_invariants);
1109
1110 static int cxgbi_sock_send_pdus(struct cxgbi_sock *csk, struct sk_buff *skb)
1111 {
1112         struct cxgbi_device *cdev = csk->cdev;
1113         struct sk_buff *next;
1114         int err, copied = 0;
1115
1116         spin_lock_bh(&csk->lock);
1117
1118         if (csk->state != CTP_ESTABLISHED) {
1119                 log_debug(1 << CXGBI_DBG_PDU_TX,
1120                         "csk 0x%p,%u,0x%lx,%u, EAGAIN.\n",
1121                         csk, csk->state, csk->flags, csk->tid);
1122                 err = -EAGAIN;
1123                 goto out_err;
1124         }
1125
1126         if (csk->err) {
1127                 log_debug(1 << CXGBI_DBG_PDU_TX,
1128                         "csk 0x%p,%u,0x%lx,%u, EPIPE %d.\n",
1129                         csk, csk->state, csk->flags, csk->tid, csk->err);
1130                 err = -EPIPE;
1131                 goto out_err;
1132         }
1133
1134         if (csk->write_seq - csk->snd_una >= csk->snd_win) {
1135                 log_debug(1 << CXGBI_DBG_PDU_TX,
1136                         "csk 0x%p,%u,0x%lx,%u, FULL %u-%u >= %u.\n",
1137                         csk, csk->state, csk->flags, csk->tid, csk->write_seq,
1138                         csk->snd_una, csk->snd_win);
1139                 err = -ENOBUFS;
1140                 goto out_err;
1141         }
1142
1143         while (skb) {
1144                 int frags = skb_shinfo(skb)->nr_frags +
1145                                 (skb->len != skb->data_len);
1146
1147                 if (unlikely(skb_headroom(skb) < cdev->skb_tx_rsvd)) {
1148                         pr_err("csk 0x%p, skb head %u < %u.\n",
1149                                 csk, skb_headroom(skb), cdev->skb_tx_rsvd);
1150                         err = -EINVAL;
1151                         goto out_err;
1152                 }
1153
1154                 if (frags >= SKB_WR_LIST_SIZE) {
1155                         pr_err("csk 0x%p, frags %d, %u,%u >%u.\n",
1156                                 csk, skb_shinfo(skb)->nr_frags, skb->len,
1157                                 skb->data_len, (uint)(SKB_WR_LIST_SIZE));
1158                         err = -EINVAL;
1159                         goto out_err;
1160                 }
1161
1162                 next = skb->next;
1163                 skb->next = NULL;
1164                 cxgbi_skcb_set_flag(skb, SKCBF_TX_NEED_HDR);
1165                 cxgbi_sock_skb_entail(csk, skb);
1166                 copied += skb->len;
1167                 csk->write_seq += skb->len +
1168                                 cxgbi_ulp_extra_len(cxgbi_skcb_ulp_mode(skb));
1169                 skb = next;
1170         }
1171 done:
1172         if (likely(skb_queue_len(&csk->write_queue)))
1173                 cdev->csk_push_tx_frames(csk, 1);
1174         spin_unlock_bh(&csk->lock);
1175         return copied;
1176
1177 out_err:
1178         if (copied == 0 && err == -EPIPE)
1179                 copied = csk->err ? csk->err : -EPIPE;
1180         else
1181                 copied = err;
1182         goto done;
1183 }
1184
1185 /*
1186  * Direct Data Placement -
1187  * Directly place the iSCSI Data-In or Data-Out PDU's payload into pre-posted
1188  * final destination host-memory buffers based on the Initiator Task Tag (ITT)
1189  * in Data-In or Target Task Tag (TTT) in Data-Out PDUs.
1190  * The host memory address is programmed into h/w in the format of pagepod
1191  * entries.
1192  * The location of the pagepod entry is encoded into ddp tag which is used as
1193  * the base for ITT/TTT.
1194  */
1195
1196 static unsigned char ddp_page_order[DDP_PGIDX_MAX] = {0, 1, 2, 4};
1197 static unsigned char ddp_page_shift[DDP_PGIDX_MAX] = {12, 13, 14, 16};
1198 static unsigned char page_idx = DDP_PGIDX_MAX;
1199
1200 static unsigned char sw_tag_idx_bits;
1201 static unsigned char sw_tag_age_bits;
1202
1203 /*
1204  * Direct-Data Placement page size adjustment
1205  */
1206 static int ddp_adjust_page_table(void)
1207 {
1208         int i;
1209         unsigned int base_order, order;
1210
1211         if (PAGE_SIZE < (1UL << ddp_page_shift[0])) {
1212                 pr_info("PAGE_SIZE 0x%lx too small, min 0x%lx\n",
1213                         PAGE_SIZE, 1UL << ddp_page_shift[0]);
1214                 return -EINVAL;
1215         }
1216
1217         base_order = get_order(1UL << ddp_page_shift[0]);
1218         order = get_order(1UL << PAGE_SHIFT);
1219
1220         for (i = 0; i < DDP_PGIDX_MAX; i++) {
1221                 /* first is the kernel page size, then just doubling */
1222                 ddp_page_order[i] = order - base_order + i;
1223                 ddp_page_shift[i] = PAGE_SHIFT + i;
1224         }
1225         return 0;
1226 }
1227
1228 static int ddp_find_page_index(unsigned long pgsz)
1229 {
1230         int i;
1231
1232         for (i = 0; i < DDP_PGIDX_MAX; i++) {
1233                 if (pgsz == (1UL << ddp_page_shift[i]))
1234                         return i;
1235         }
1236         pr_info("ddp page size %lu not supported.\n", pgsz);
1237         return DDP_PGIDX_MAX;
1238 }
1239
1240 static void ddp_setup_host_page_size(void)
1241 {
1242         if (page_idx == DDP_PGIDX_MAX) {
1243                 page_idx = ddp_find_page_index(PAGE_SIZE);
1244
1245                 if (page_idx == DDP_PGIDX_MAX) {
1246                         pr_info("system PAGE %lu, update hw.\n", PAGE_SIZE);
1247                         if (ddp_adjust_page_table() < 0) {
1248                                 pr_info("PAGE %lu, disable ddp.\n", PAGE_SIZE);
1249                                 return;
1250                         }
1251                         page_idx = ddp_find_page_index(PAGE_SIZE);
1252                 }
1253                 pr_info("system PAGE %lu, ddp idx %u.\n", PAGE_SIZE, page_idx);
1254         }
1255 }
1256
1257 void cxgbi_ddp_page_size_factor(int *pgsz_factor)
1258 {
1259         int i;
1260
1261         for (i = 0; i < DDP_PGIDX_MAX; i++)
1262                 pgsz_factor[i] = ddp_page_order[i];
1263 }
1264 EXPORT_SYMBOL_GPL(cxgbi_ddp_page_size_factor);
1265
1266 /*
1267  * DDP setup & teardown
1268  */
1269
1270 void cxgbi_ddp_ppod_set(struct cxgbi_pagepod *ppod,
1271                         struct cxgbi_pagepod_hdr *hdr,
1272                         struct cxgbi_gather_list *gl, unsigned int gidx)
1273 {
1274         int i;
1275
1276         memcpy(ppod, hdr, sizeof(*hdr));
1277         for (i = 0; i < (PPOD_PAGES_MAX + 1); i++, gidx++) {
1278                 ppod->addr[i] = gidx < gl->nelem ?
1279                                 cpu_to_be64(gl->phys_addr[gidx]) : 0ULL;
1280         }
1281 }
1282 EXPORT_SYMBOL_GPL(cxgbi_ddp_ppod_set);
1283
1284 void cxgbi_ddp_ppod_clear(struct cxgbi_pagepod *ppod)
1285 {
1286         memset(ppod, 0, sizeof(*ppod));
1287 }
1288 EXPORT_SYMBOL_GPL(cxgbi_ddp_ppod_clear);
1289
1290 static inline int ddp_find_unused_entries(struct cxgbi_ddp_info *ddp,
1291                                         unsigned int start, unsigned int max,
1292                                         unsigned int count,
1293                                         struct cxgbi_gather_list *gl)
1294 {
1295         unsigned int i, j, k;
1296
1297         /*  not enough entries */
1298         if ((max - start) < count) {
1299                 log_debug(1 << CXGBI_DBG_DDP,
1300                         "NOT enough entries %u+%u < %u.\n", start, count, max);
1301                 return -EBUSY;
1302         }
1303
1304         max -= count;
1305         spin_lock(&ddp->map_lock);
1306         for (i = start; i < max;) {
1307                 for (j = 0, k = i; j < count; j++, k++) {
1308                         if (ddp->gl_map[k])
1309                                 break;
1310                 }
1311                 if (j == count) {
1312                         for (j = 0, k = i; j < count; j++, k++)
1313                                 ddp->gl_map[k] = gl;
1314                         spin_unlock(&ddp->map_lock);
1315                         return i;
1316                 }
1317                 i += j + 1;
1318         }
1319         spin_unlock(&ddp->map_lock);
1320         log_debug(1 << CXGBI_DBG_DDP,
1321                 "NO suitable entries %u available.\n", count);
1322         return -EBUSY;
1323 }
1324
1325 static inline void ddp_unmark_entries(struct cxgbi_ddp_info *ddp,
1326                                                 int start, int count)
1327 {
1328         spin_lock(&ddp->map_lock);
1329         memset(&ddp->gl_map[start], 0,
1330                 count * sizeof(struct cxgbi_gather_list *));
1331         spin_unlock(&ddp->map_lock);
1332 }
1333
1334 static inline void ddp_gl_unmap(struct pci_dev *pdev,
1335                                         struct cxgbi_gather_list *gl)
1336 {
1337         int i;
1338
1339         for (i = 0; i < gl->nelem; i++)
1340                 dma_unmap_page(&pdev->dev, gl->phys_addr[i], PAGE_SIZE,
1341                                 PCI_DMA_FROMDEVICE);
1342 }
1343
1344 static inline int ddp_gl_map(struct pci_dev *pdev,
1345                                     struct cxgbi_gather_list *gl)
1346 {
1347         int i;
1348
1349         for (i = 0; i < gl->nelem; i++) {
1350                 gl->phys_addr[i] = dma_map_page(&pdev->dev, gl->pages[i], 0,
1351                                                 PAGE_SIZE,
1352                                                 PCI_DMA_FROMDEVICE);
1353                 if (unlikely(dma_mapping_error(&pdev->dev, gl->phys_addr[i]))) {
1354                         log_debug(1 << CXGBI_DBG_DDP,
1355                                 "page %d 0x%p, 0x%p dma mapping err.\n",
1356                                 i, gl->pages[i], pdev);
1357                         goto unmap;
1358                 }
1359         }
1360         return i;
1361 unmap:
1362         if (i) {
1363                 unsigned int nelem = gl->nelem;
1364
1365                 gl->nelem = i;
1366                 ddp_gl_unmap(pdev, gl);
1367                 gl->nelem = nelem;
1368         }
1369         return -EINVAL;
1370 }
1371
1372 static void ddp_release_gl(struct cxgbi_gather_list *gl,
1373                                   struct pci_dev *pdev)
1374 {
1375         ddp_gl_unmap(pdev, gl);
1376         kfree(gl);
1377 }
1378
1379 static struct cxgbi_gather_list *ddp_make_gl(unsigned int xferlen,
1380                                                     struct scatterlist *sgl,
1381                                                     unsigned int sgcnt,
1382                                                     struct pci_dev *pdev,
1383                                                     gfp_t gfp)
1384 {
1385         struct cxgbi_gather_list *gl;
1386         struct scatterlist *sg = sgl;
1387         struct page *sgpage = sg_page(sg);
1388         unsigned int sglen = sg->length;
1389         unsigned int sgoffset = sg->offset;
1390         unsigned int npages = (xferlen + sgoffset + PAGE_SIZE - 1) >>
1391                                 PAGE_SHIFT;
1392         int i = 1, j = 0;
1393
1394         if (xferlen < DDP_THRESHOLD) {
1395                 log_debug(1 << CXGBI_DBG_DDP,
1396                         "xfer %u < threshold %u, no ddp.\n",
1397                         xferlen, DDP_THRESHOLD);
1398                 return NULL;
1399         }
1400
1401         gl = kzalloc(sizeof(struct cxgbi_gather_list) +
1402                      npages * (sizeof(dma_addr_t) +
1403                      sizeof(struct page *)), gfp);
1404         if (!gl) {
1405                 log_debug(1 << CXGBI_DBG_DDP,
1406                         "xfer %u, %u pages, OOM.\n", xferlen, npages);
1407                 return NULL;
1408         }
1409
1410          log_debug(1 << CXGBI_DBG_DDP,
1411                 "xfer %u, sgl %u, gl max %u.\n", xferlen, sgcnt, npages);
1412
1413         gl->pages = (struct page **)&gl->phys_addr[npages];
1414         gl->nelem = npages;
1415         gl->length = xferlen;
1416         gl->offset = sgoffset;
1417         gl->pages[0] = sgpage;
1418
1419         for (i = 1, sg = sg_next(sgl), j = 0; i < sgcnt;
1420                 i++, sg = sg_next(sg)) {
1421                 struct page *page = sg_page(sg);
1422
1423                 if (sgpage == page && sg->offset == sgoffset + sglen)
1424                         sglen += sg->length;
1425                 else {
1426                         /*  make sure the sgl is fit for ddp:
1427                          *  each has the same page size, and
1428                          *  all of the middle pages are used completely
1429                          */
1430                         if ((j && sgoffset) || ((i != sgcnt - 1) &&
1431                             ((sglen + sgoffset) & ~PAGE_MASK))) {
1432                                 log_debug(1 << CXGBI_DBG_DDP,
1433                                         "page %d/%u, %u + %u.\n",
1434                                         i, sgcnt, sgoffset, sglen);
1435                                 goto error_out;
1436                         }
1437
1438                         j++;
1439                         if (j == gl->nelem || sg->offset) {
1440                                 log_debug(1 << CXGBI_DBG_DDP,
1441                                         "page %d/%u, offset %u.\n",
1442                                         j, gl->nelem, sg->offset);
1443                                 goto error_out;
1444                         }
1445                         gl->pages[j] = page;
1446                         sglen = sg->length;
1447                         sgoffset = sg->offset;
1448                         sgpage = page;
1449                 }
1450         }
1451         gl->nelem = ++j;
1452
1453         if (ddp_gl_map(pdev, gl) < 0)
1454                 goto error_out;
1455
1456         return gl;
1457
1458 error_out:
1459         kfree(gl);
1460         return NULL;
1461 }
1462
1463 static void ddp_tag_release(struct cxgbi_hba *chba, u32 tag)
1464 {
1465         struct cxgbi_device *cdev = chba->cdev;
1466         struct cxgbi_ddp_info *ddp = cdev->ddp;
1467         u32 idx;
1468
1469         idx = (tag >> PPOD_IDX_SHIFT) & ddp->idx_mask;
1470         if (idx < ddp->nppods) {
1471                 struct cxgbi_gather_list *gl = ddp->gl_map[idx];
1472                 unsigned int npods;
1473
1474                 if (!gl || !gl->nelem) {
1475                         pr_warn("tag 0x%x, idx %u, gl 0x%p, %u.\n",
1476                                 tag, idx, gl, gl ? gl->nelem : 0);
1477                         return;
1478                 }
1479                 npods = (gl->nelem + PPOD_PAGES_MAX - 1) >> PPOD_PAGES_SHIFT;
1480                 log_debug(1 << CXGBI_DBG_DDP,
1481                         "tag 0x%x, release idx %u, npods %u.\n",
1482                         tag, idx, npods);
1483                 cdev->csk_ddp_clear(chba, tag, idx, npods);
1484                 ddp_unmark_entries(ddp, idx, npods);
1485                 ddp_release_gl(gl, ddp->pdev);
1486         } else
1487                 pr_warn("tag 0x%x, idx %u > max %u.\n", tag, idx, ddp->nppods);
1488 }
1489
1490 static int ddp_tag_reserve(struct cxgbi_sock *csk, unsigned int tid,
1491                            u32 sw_tag, u32 *tagp, struct cxgbi_gather_list *gl,
1492                            gfp_t gfp)
1493 {
1494         struct cxgbi_device *cdev = csk->cdev;
1495         struct cxgbi_ddp_info *ddp = cdev->ddp;
1496         struct cxgbi_tag_format *tformat = &cdev->tag_format;
1497         struct cxgbi_pagepod_hdr hdr;
1498         unsigned int npods;
1499         int idx = -1;
1500         int err = -ENOMEM;
1501         u32 tag;
1502
1503         npods = (gl->nelem + PPOD_PAGES_MAX - 1) >> PPOD_PAGES_SHIFT;
1504         if (ddp->idx_last == ddp->nppods)
1505                 idx = ddp_find_unused_entries(ddp, 0, ddp->nppods,
1506                                                         npods, gl);
1507         else {
1508                 idx = ddp_find_unused_entries(ddp, ddp->idx_last + 1,
1509                                                         ddp->nppods, npods,
1510                                                         gl);
1511                 if (idx < 0 && ddp->idx_last >= npods) {
1512                         idx = ddp_find_unused_entries(ddp, 0,
1513                                 min(ddp->idx_last + npods, ddp->nppods),
1514                                                         npods, gl);
1515                 }
1516         }
1517         if (idx < 0) {
1518                 log_debug(1 << CXGBI_DBG_DDP,
1519                         "xferlen %u, gl %u, npods %u NO DDP.\n",
1520                         gl->length, gl->nelem, npods);
1521                 return idx;
1522         }
1523
1524         tag = cxgbi_ddp_tag_base(tformat, sw_tag);
1525         tag |= idx << PPOD_IDX_SHIFT;
1526
1527         hdr.rsvd = 0;
1528         hdr.vld_tid = htonl(PPOD_VALID_FLAG | PPOD_TID(tid));
1529         hdr.pgsz_tag_clr = htonl(tag & ddp->rsvd_tag_mask);
1530         hdr.max_offset = htonl(gl->length);
1531         hdr.page_offset = htonl(gl->offset);
1532
1533         err = cdev->csk_ddp_set(csk, &hdr, idx, npods, gl);
1534         if (err < 0)
1535                 goto unmark_entries;
1536
1537         ddp->idx_last = idx;
1538         log_debug(1 << CXGBI_DBG_DDP,
1539                 "xfer %u, gl %u,%u, tid 0x%x, tag 0x%x->0x%x(%u,%u).\n",
1540                 gl->length, gl->nelem, gl->offset, tid, sw_tag, tag, idx,
1541                 npods);
1542         *tagp = tag;
1543         return 0;
1544
1545 unmark_entries:
1546         ddp_unmark_entries(ddp, idx, npods);
1547         return err;
1548 }
1549
1550 int cxgbi_ddp_reserve(struct cxgbi_sock *csk, unsigned int *tagp,
1551                         unsigned int sw_tag, unsigned int xferlen,
1552                         struct scatterlist *sgl, unsigned int sgcnt, gfp_t gfp)
1553 {
1554         struct cxgbi_device *cdev = csk->cdev;
1555         struct cxgbi_tag_format *tformat = &cdev->tag_format;
1556         struct cxgbi_gather_list *gl;
1557         int err;
1558
1559         if (page_idx >= DDP_PGIDX_MAX || !cdev->ddp ||
1560             xferlen < DDP_THRESHOLD) {
1561                 log_debug(1 << CXGBI_DBG_DDP,
1562                         "pgidx %u, xfer %u, NO ddp.\n", page_idx, xferlen);
1563                 return -EINVAL;
1564         }
1565
1566         if (!cxgbi_sw_tag_usable(tformat, sw_tag)) {
1567                 log_debug(1 << CXGBI_DBG_DDP,
1568                         "sw_tag 0x%x NOT usable.\n", sw_tag);
1569                 return -EINVAL;
1570         }
1571
1572         gl = ddp_make_gl(xferlen, sgl, sgcnt, cdev->pdev, gfp);
1573         if (!gl)
1574                 return -ENOMEM;
1575
1576         err = ddp_tag_reserve(csk, csk->tid, sw_tag, tagp, gl, gfp);
1577         if (err < 0)
1578                 ddp_release_gl(gl, cdev->pdev);
1579
1580         return err;
1581 }
1582
1583 static void ddp_destroy(struct kref *kref)
1584 {
1585         struct cxgbi_ddp_info *ddp = container_of(kref,
1586                                                 struct cxgbi_ddp_info,
1587                                                 refcnt);
1588         struct cxgbi_device *cdev = ddp->cdev;
1589         int i = 0;
1590
1591         pr_info("kref 0, destroy ddp 0x%p, cdev 0x%p.\n", ddp, cdev);
1592
1593         while (i < ddp->nppods) {
1594                 struct cxgbi_gather_list *gl = ddp->gl_map[i];
1595
1596                 if (gl) {
1597                         int npods = (gl->nelem + PPOD_PAGES_MAX - 1)
1598                                         >> PPOD_PAGES_SHIFT;
1599                         pr_info("cdev 0x%p, ddp %d + %d.\n", cdev, i, npods);
1600                         kfree(gl);
1601                         i += npods;
1602                 } else
1603                         i++;
1604         }
1605         cxgbi_free_big_mem(ddp);
1606 }
1607
1608 int cxgbi_ddp_cleanup(struct cxgbi_device *cdev)
1609 {
1610         struct cxgbi_ddp_info *ddp = cdev->ddp;
1611
1612         log_debug(1 << CXGBI_DBG_DDP,
1613                 "cdev 0x%p, release ddp 0x%p.\n", cdev, ddp);
1614         cdev->ddp = NULL;
1615         if (ddp)
1616                 return kref_put(&ddp->refcnt, ddp_destroy);
1617         return 0;
1618 }
1619 EXPORT_SYMBOL_GPL(cxgbi_ddp_cleanup);
1620
1621 int cxgbi_ddp_init(struct cxgbi_device *cdev,
1622                    unsigned int llimit, unsigned int ulimit,
1623                    unsigned int max_txsz, unsigned int max_rxsz)
1624 {
1625         struct cxgbi_ddp_info *ddp;
1626         unsigned int ppmax, bits;
1627
1628         ppmax = (ulimit - llimit + 1) >> PPOD_SIZE_SHIFT;
1629         bits = __ilog2_u32(ppmax) + 1;
1630         if (bits > PPOD_IDX_MAX_SIZE)
1631                 bits = PPOD_IDX_MAX_SIZE;
1632         ppmax = (1 << (bits - 1)) - 1;
1633
1634         ddp = cxgbi_alloc_big_mem(sizeof(struct cxgbi_ddp_info) +
1635                                 ppmax * (sizeof(struct cxgbi_gather_list *) +
1636                                          sizeof(struct sk_buff *)),
1637                                 GFP_KERNEL);
1638         if (!ddp) {
1639                 pr_warn("cdev 0x%p, ddp ppmax %u OOM.\n", cdev, ppmax);
1640                 return -ENOMEM;
1641         }
1642         ddp->gl_map = (struct cxgbi_gather_list **)(ddp + 1);
1643         cdev->ddp = ddp;
1644
1645         spin_lock_init(&ddp->map_lock);
1646         kref_init(&ddp->refcnt);
1647
1648         ddp->cdev = cdev;
1649         ddp->pdev = cdev->pdev;
1650         ddp->llimit = llimit;
1651         ddp->ulimit = ulimit;
1652         ddp->max_txsz = min_t(unsigned int, max_txsz, ULP2_MAX_PKT_SIZE);
1653         ddp->max_rxsz = min_t(unsigned int, max_rxsz, ULP2_MAX_PKT_SIZE);
1654         ddp->nppods = ppmax;
1655         ddp->idx_last = ppmax;
1656         ddp->idx_bits = bits;
1657         ddp->idx_mask = (1 << bits) - 1;
1658         ddp->rsvd_tag_mask = (1 << (bits + PPOD_IDX_SHIFT)) - 1;
1659
1660         cdev->tag_format.sw_bits = sw_tag_idx_bits + sw_tag_age_bits;
1661         cdev->tag_format.rsvd_bits = ddp->idx_bits;
1662         cdev->tag_format.rsvd_shift = PPOD_IDX_SHIFT;
1663         cdev->tag_format.rsvd_mask = (1 << cdev->tag_format.rsvd_bits) - 1;
1664
1665         pr_info("%s tag format, sw %u, rsvd %u,%u, mask 0x%x.\n",
1666                 cdev->ports[0]->name, cdev->tag_format.sw_bits,
1667                 cdev->tag_format.rsvd_bits, cdev->tag_format.rsvd_shift,
1668                 cdev->tag_format.rsvd_mask);
1669
1670         cdev->tx_max_size = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
1671                                 ddp->max_txsz - ISCSI_PDU_NONPAYLOAD_LEN);
1672         cdev->rx_max_size = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
1673                                 ddp->max_rxsz - ISCSI_PDU_NONPAYLOAD_LEN);
1674
1675         log_debug(1 << CXGBI_DBG_DDP,
1676                 "%s max payload size: %u/%u, %u/%u.\n",
1677                 cdev->ports[0]->name, cdev->tx_max_size, ddp->max_txsz,
1678                 cdev->rx_max_size, ddp->max_rxsz);
1679         return 0;
1680 }
1681 EXPORT_SYMBOL_GPL(cxgbi_ddp_init);
1682
1683 /*
1684  * APIs interacting with open-iscsi libraries
1685  */
1686
1687 static unsigned char padding[4];
1688
1689 static void task_release_itt(struct iscsi_task *task, itt_t hdr_itt)
1690 {
1691         struct scsi_cmnd *sc = task->sc;
1692         struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
1693         struct cxgbi_conn *cconn = tcp_conn->dd_data;
1694         struct cxgbi_hba *chba = cconn->chba;
1695         struct cxgbi_tag_format *tformat = &chba->cdev->tag_format;
1696         u32 tag = ntohl((__force u32)hdr_itt);
1697
1698         log_debug(1 << CXGBI_DBG_DDP,
1699                    "cdev 0x%p, release tag 0x%x.\n", chba->cdev, tag);
1700         if (sc &&
1701             (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE) &&
1702             cxgbi_is_ddp_tag(tformat, tag))
1703                 ddp_tag_release(chba, tag);
1704 }
1705
1706 static int task_reserve_itt(struct iscsi_task *task, itt_t *hdr_itt)
1707 {
1708         struct scsi_cmnd *sc = task->sc;
1709         struct iscsi_conn *conn = task->conn;
1710         struct iscsi_session *sess = conn->session;
1711         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1712         struct cxgbi_conn *cconn = tcp_conn->dd_data;
1713         struct cxgbi_hba *chba = cconn->chba;
1714         struct cxgbi_tag_format *tformat = &chba->cdev->tag_format;
1715         u32 sw_tag = (sess->age << cconn->task_idx_bits) | task->itt;
1716         u32 tag = 0;
1717         int err = -EINVAL;
1718
1719         if (sc &&
1720             (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE)) {
1721                 err = cxgbi_ddp_reserve(cconn->cep->csk, &tag, sw_tag,
1722                                         scsi_in(sc)->length,
1723                                         scsi_in(sc)->table.sgl,
1724                                         scsi_in(sc)->table.nents,
1725                                         GFP_ATOMIC);
1726                 if (err < 0)
1727                         log_debug(1 << CXGBI_DBG_DDP,
1728                                 "csk 0x%p, R task 0x%p, %u,%u, no ddp.\n",
1729                                 cconn->cep->csk, task, scsi_in(sc)->length,
1730                                 scsi_in(sc)->table.nents);
1731         }
1732
1733         if (err < 0)
1734                 tag = cxgbi_set_non_ddp_tag(tformat, sw_tag);
1735         /*  the itt need to sent in big-endian order */
1736         *hdr_itt = (__force itt_t)htonl(tag);
1737
1738         log_debug(1 << CXGBI_DBG_DDP,
1739                 "cdev 0x%p, task 0x%p, 0x%x(0x%x,0x%x)->0x%x/0x%x.\n",
1740                 chba->cdev, task, sw_tag, task->itt, sess->age, tag, *hdr_itt);
1741         return 0;
1742 }
1743
1744 void cxgbi_parse_pdu_itt(struct iscsi_conn *conn, itt_t itt, int *idx, int *age)
1745 {
1746         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1747         struct cxgbi_conn *cconn = tcp_conn->dd_data;
1748         struct cxgbi_device *cdev = cconn->chba->cdev;
1749         u32 tag = ntohl((__force u32) itt);
1750         u32 sw_bits;
1751
1752         sw_bits = cxgbi_tag_nonrsvd_bits(&cdev->tag_format, tag);
1753         if (idx)
1754                 *idx = sw_bits & ((1 << cconn->task_idx_bits) - 1);
1755         if (age)
1756                 *age = (sw_bits >> cconn->task_idx_bits) & ISCSI_AGE_MASK;
1757
1758         log_debug(1 << CXGBI_DBG_DDP,
1759                 "cdev 0x%p, tag 0x%x/0x%x, -> 0x%x(0x%x,0x%x).\n",
1760                 cdev, tag, itt, sw_bits, idx ? *idx : 0xFFFFF,
1761                 age ? *age : 0xFF);
1762 }
1763 EXPORT_SYMBOL_GPL(cxgbi_parse_pdu_itt);
1764
1765 void cxgbi_conn_tx_open(struct cxgbi_sock *csk)
1766 {
1767         struct iscsi_conn *conn = csk->user_data;
1768
1769         if (conn) {
1770                 log_debug(1 << CXGBI_DBG_SOCK,
1771                         "csk 0x%p, cid %d.\n", csk, conn->id);
1772                 iscsi_conn_queue_work(conn);
1773         }
1774 }
1775 EXPORT_SYMBOL_GPL(cxgbi_conn_tx_open);
1776
1777 /*
1778  * pdu receive, interact with libiscsi_tcp
1779  */
1780 static inline int read_pdu_skb(struct iscsi_conn *conn,
1781                                struct sk_buff *skb,
1782                                unsigned int offset,
1783                                int offloaded)
1784 {
1785         int status = 0;
1786         int bytes_read;
1787
1788         bytes_read = iscsi_tcp_recv_skb(conn, skb, offset, offloaded, &status);
1789         switch (status) {
1790         case ISCSI_TCP_CONN_ERR:
1791                 pr_info("skb 0x%p, off %u, %d, TCP_ERR.\n",
1792                           skb, offset, offloaded);
1793                 return -EIO;
1794         case ISCSI_TCP_SUSPENDED:
1795                 log_debug(1 << CXGBI_DBG_PDU_RX,
1796                         "skb 0x%p, off %u, %d, TCP_SUSPEND, rc %d.\n",
1797                         skb, offset, offloaded, bytes_read);
1798                 /* no transfer - just have caller flush queue */
1799                 return bytes_read;
1800         case ISCSI_TCP_SKB_DONE:
1801                 pr_info("skb 0x%p, off %u, %d, TCP_SKB_DONE.\n",
1802                         skb, offset, offloaded);
1803                 /*
1804                  * pdus should always fit in the skb and we should get
1805                  * segment done notifcation.
1806                  */
1807                 iscsi_conn_printk(KERN_ERR, conn, "Invalid pdu or skb.");
1808                 return -EFAULT;
1809         case ISCSI_TCP_SEGMENT_DONE:
1810                 log_debug(1 << CXGBI_DBG_PDU_RX,
1811                         "skb 0x%p, off %u, %d, TCP_SEG_DONE, rc %d.\n",
1812                         skb, offset, offloaded, bytes_read);
1813                 return bytes_read;
1814         default:
1815                 pr_info("skb 0x%p, off %u, %d, invalid status %d.\n",
1816                         skb, offset, offloaded, status);
1817                 return -EINVAL;
1818         }
1819 }
1820
1821 static int skb_read_pdu_bhs(struct iscsi_conn *conn, struct sk_buff *skb)
1822 {
1823         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1824
1825         log_debug(1 << CXGBI_DBG_PDU_RX,
1826                 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1827                 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1828
1829         if (!iscsi_tcp_recv_segment_is_hdr(tcp_conn)) {
1830                 pr_info("conn 0x%p, skb 0x%p, not hdr.\n", conn, skb);
1831                 iscsi_conn_failure(conn, ISCSI_ERR_PROTO);
1832                 return -EIO;
1833         }
1834
1835         if (conn->hdrdgst_en &&
1836             cxgbi_skcb_test_flag(skb, SKCBF_RX_HCRC_ERR)) {
1837                 pr_info("conn 0x%p, skb 0x%p, hcrc.\n", conn, skb);
1838                 iscsi_conn_failure(conn, ISCSI_ERR_HDR_DGST);
1839                 return -EIO;
1840         }
1841
1842         return read_pdu_skb(conn, skb, 0, 0);
1843 }
1844
1845 static int skb_read_pdu_data(struct iscsi_conn *conn, struct sk_buff *lskb,
1846                              struct sk_buff *skb, unsigned int offset)
1847 {
1848         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1849         bool offloaded = 0;
1850         int opcode = tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK;
1851
1852         log_debug(1 << CXGBI_DBG_PDU_RX,
1853                 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1854                 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1855
1856         if (conn->datadgst_en &&
1857             cxgbi_skcb_test_flag(lskb, SKCBF_RX_DCRC_ERR)) {
1858                 pr_info("conn 0x%p, skb 0x%p, dcrc 0x%lx.\n",
1859                         conn, lskb, cxgbi_skcb_flags(lskb));
1860                 iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST);
1861                 return -EIO;
1862         }
1863
1864         if (iscsi_tcp_recv_segment_is_hdr(tcp_conn))
1865                 return 0;
1866
1867         /* coalesced, add header digest length */
1868         if (lskb == skb && conn->hdrdgst_en)
1869                 offset += ISCSI_DIGEST_SIZE;
1870
1871         if (cxgbi_skcb_test_flag(lskb, SKCBF_RX_DATA_DDPD))
1872                 offloaded = 1;
1873
1874         if (opcode == ISCSI_OP_SCSI_DATA_IN)
1875                 log_debug(1 << CXGBI_DBG_PDU_RX,
1876                         "skb 0x%p, op 0x%x, itt 0x%x, %u %s ddp'ed.\n",
1877                         skb, opcode, ntohl(tcp_conn->in.hdr->itt),
1878                         tcp_conn->in.datalen, offloaded ? "is" : "not");
1879
1880         return read_pdu_skb(conn, skb, offset, offloaded);
1881 }
1882
1883 static void csk_return_rx_credits(struct cxgbi_sock *csk, int copied)
1884 {
1885         struct cxgbi_device *cdev = csk->cdev;
1886         int must_send;
1887         u32 credits;
1888
1889         log_debug(1 << CXGBI_DBG_PDU_RX,
1890                 "csk 0x%p,%u,0x%lx,%u, seq %u, wup %u, thre %u, %u.\n",
1891                 csk, csk->state, csk->flags, csk->tid, csk->copied_seq,
1892                 csk->rcv_wup, cdev->rx_credit_thres,
1893                 csk->rcv_win);
1894
1895         if (csk->state != CTP_ESTABLISHED)
1896                 return;
1897
1898         credits = csk->copied_seq - csk->rcv_wup;
1899         if (unlikely(!credits))
1900                 return;
1901         if (unlikely(cdev->rx_credit_thres == 0))
1902                 return;
1903
1904         must_send = credits + 16384 >= csk->rcv_win;
1905         if (must_send || credits >= cdev->rx_credit_thres)
1906                 csk->rcv_wup += cdev->csk_send_rx_credits(csk, credits);
1907 }
1908
1909 void cxgbi_conn_pdu_ready(struct cxgbi_sock *csk)
1910 {
1911         struct cxgbi_device *cdev = csk->cdev;
1912         struct iscsi_conn *conn = csk->user_data;
1913         struct sk_buff *skb;
1914         unsigned int read = 0;
1915         int err = 0;
1916
1917         log_debug(1 << CXGBI_DBG_PDU_RX,
1918                 "csk 0x%p, conn 0x%p.\n", csk, conn);
1919
1920         if (unlikely(!conn || conn->suspend_rx)) {
1921                 log_debug(1 << CXGBI_DBG_PDU_RX,
1922                         "csk 0x%p, conn 0x%p, id %d, suspend_rx %lu!\n",
1923                         csk, conn, conn ? conn->id : 0xFF,
1924                         conn ? conn->suspend_rx : 0xFF);
1925                 return;
1926         }
1927
1928         while (!err) {
1929                 skb = skb_peek(&csk->receive_queue);
1930                 if (!skb ||
1931                     !(cxgbi_skcb_test_flag(skb, SKCBF_RX_STATUS))) {
1932                         if (skb)
1933                                 log_debug(1 << CXGBI_DBG_PDU_RX,
1934                                         "skb 0x%p, NOT ready 0x%lx.\n",
1935                                         skb, cxgbi_skcb_flags(skb));
1936                         break;
1937                 }
1938                 __skb_unlink(skb, &csk->receive_queue);
1939
1940                 read += cxgbi_skcb_rx_pdulen(skb);
1941                 log_debug(1 << CXGBI_DBG_PDU_RX,
1942                         "csk 0x%p, skb 0x%p,%u,f 0x%lx, pdu len %u.\n",
1943                         csk, skb, skb->len, cxgbi_skcb_flags(skb),
1944                         cxgbi_skcb_rx_pdulen(skb));
1945
1946                 if (cxgbi_skcb_test_flag(skb, SKCBF_RX_COALESCED)) {
1947                         err = skb_read_pdu_bhs(conn, skb);
1948                         if (err < 0) {
1949                                 pr_err("coalesced bhs, csk 0x%p, skb 0x%p,%u, "
1950                                         "f 0x%lx, plen %u.\n",
1951                                         csk, skb, skb->len,
1952                                         cxgbi_skcb_flags(skb),
1953                                         cxgbi_skcb_rx_pdulen(skb));
1954                                 goto skb_done;
1955                         }
1956                         err = skb_read_pdu_data(conn, skb, skb,
1957                                                 err + cdev->skb_rx_extra);
1958                         if (err < 0)
1959                                 pr_err("coalesced data, csk 0x%p, skb 0x%p,%u, "
1960                                         "f 0x%lx, plen %u.\n",
1961                                         csk, skb, skb->len,
1962                                         cxgbi_skcb_flags(skb),
1963                                         cxgbi_skcb_rx_pdulen(skb));
1964                 } else {
1965                         err = skb_read_pdu_bhs(conn, skb);
1966                         if (err < 0) {
1967                                 pr_err("bhs, csk 0x%p, skb 0x%p,%u, "
1968                                         "f 0x%lx, plen %u.\n",
1969                                         csk, skb, skb->len,
1970                                         cxgbi_skcb_flags(skb),
1971                                         cxgbi_skcb_rx_pdulen(skb));
1972                                 goto skb_done;
1973                         }
1974
1975                         if (cxgbi_skcb_test_flag(skb, SKCBF_RX_DATA)) {
1976                                 struct sk_buff *dskb;
1977
1978                                 dskb = skb_peek(&csk->receive_queue);
1979                                 if (!dskb) {
1980                                         pr_err("csk 0x%p, skb 0x%p,%u, f 0x%lx,"
1981                                                 " plen %u, NO data.\n",
1982                                                 csk, skb, skb->len,
1983                                                 cxgbi_skcb_flags(skb),
1984                                                 cxgbi_skcb_rx_pdulen(skb));
1985                                         err = -EIO;
1986                                         goto skb_done;
1987                                 }
1988                                 __skb_unlink(dskb, &csk->receive_queue);
1989
1990                                 err = skb_read_pdu_data(conn, skb, dskb, 0);
1991                                 if (err < 0)
1992                                         pr_err("data, csk 0x%p, skb 0x%p,%u, "
1993                                                 "f 0x%lx, plen %u, dskb 0x%p,"
1994                                                 "%u.\n",
1995                                                 csk, skb, skb->len,
1996                                                 cxgbi_skcb_flags(skb),
1997                                                 cxgbi_skcb_rx_pdulen(skb),
1998                                                 dskb, dskb->len);
1999                                 __kfree_skb(dskb);
2000                         } else
2001                                 err = skb_read_pdu_data(conn, skb, skb, 0);
2002                 }
2003 skb_done:
2004                 __kfree_skb(skb);
2005
2006                 if (err < 0)
2007                         break;
2008         }
2009
2010         log_debug(1 << CXGBI_DBG_PDU_RX, "csk 0x%p, read %u.\n", csk, read);
2011         if (read) {
2012                 csk->copied_seq += read;
2013                 csk_return_rx_credits(csk, read);
2014                 conn->rxdata_octets += read;
2015         }
2016
2017         if (err < 0) {
2018                 pr_info("csk 0x%p, 0x%p, rx failed %d, read %u.\n",
2019                         csk, conn, err, read);
2020                 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
2021         }
2022 }
2023 EXPORT_SYMBOL_GPL(cxgbi_conn_pdu_ready);
2024
2025 static int sgl_seek_offset(struct scatterlist *sgl, unsigned int sgcnt,
2026                                 unsigned int offset, unsigned int *off,
2027                                 struct scatterlist **sgp)
2028 {
2029         int i;
2030         struct scatterlist *sg;
2031
2032         for_each_sg(sgl, sg, sgcnt, i) {
2033                 if (offset < sg->length) {
2034                         *off = offset;
2035                         *sgp = sg;
2036                         return 0;
2037                 }
2038                 offset -= sg->length;
2039         }
2040         return -EFAULT;
2041 }
2042
2043 static int sgl_read_to_frags(struct scatterlist *sg, unsigned int sgoffset,
2044                                 unsigned int dlen, struct page_frag *frags,
2045                                 int frag_max)
2046 {
2047         unsigned int datalen = dlen;
2048         unsigned int sglen = sg->length - sgoffset;
2049         struct page *page = sg_page(sg);
2050         int i;
2051
2052         i = 0;
2053         do {
2054                 unsigned int copy;
2055
2056                 if (!sglen) {
2057                         sg = sg_next(sg);
2058                         if (!sg) {
2059                                 pr_warn("sg %d NULL, len %u/%u.\n",
2060                                         i, datalen, dlen);
2061                                 return -EINVAL;
2062                         }
2063                         sgoffset = 0;
2064                         sglen = sg->length;
2065                         page = sg_page(sg);
2066
2067                 }
2068                 copy = min(datalen, sglen);
2069                 if (i && page == frags[i - 1].page &&
2070                     sgoffset + sg->offset ==
2071                         frags[i - 1].offset + frags[i - 1].size) {
2072                         frags[i - 1].size += copy;
2073                 } else {
2074                         if (i >= frag_max) {
2075                                 pr_warn("too many pages %u, dlen %u.\n",
2076                                         frag_max, dlen);
2077                                 return -EINVAL;
2078                         }
2079
2080                         frags[i].page = page;
2081                         frags[i].offset = sg->offset + sgoffset;
2082                         frags[i].size = copy;
2083                         i++;
2084                 }
2085                 datalen -= copy;
2086                 sgoffset += copy;
2087                 sglen -= copy;
2088         } while (datalen);
2089
2090         return i;
2091 }
2092
2093 int cxgbi_conn_alloc_pdu(struct iscsi_task *task, u8 opcode)
2094 {
2095         struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
2096         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2097         struct cxgbi_device *cdev = cconn->chba->cdev;
2098         struct iscsi_conn *conn = task->conn;
2099         struct iscsi_tcp_task *tcp_task = task->dd_data;
2100         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2101         struct scsi_cmnd *sc = task->sc;
2102         int headroom = SKB_TX_ISCSI_PDU_HEADER_MAX;
2103
2104         tcp_task->dd_data = tdata;
2105         task->hdr = NULL;
2106
2107         if (SKB_MAX_HEAD(cdev->skb_tx_rsvd) > (512 * MAX_SKB_FRAGS) &&
2108             (opcode == ISCSI_OP_SCSI_DATA_OUT ||
2109              (opcode == ISCSI_OP_SCSI_CMD &&
2110               (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_TO_DEVICE))))
2111                 /* data could goes into skb head */
2112                 headroom += min_t(unsigned int,
2113                                 SKB_MAX_HEAD(cdev->skb_tx_rsvd),
2114                                 conn->max_xmit_dlength);
2115
2116         tdata->skb = alloc_skb(cdev->skb_tx_rsvd + headroom, GFP_ATOMIC);
2117         if (!tdata->skb) {
2118                 struct cxgbi_sock *csk = cconn->cep->csk;
2119                 struct net_device *ndev = cdev->ports[csk->port_id];
2120                 ndev->stats.tx_dropped++;
2121                 return -ENOMEM;
2122         }
2123
2124         skb_reserve(tdata->skb, cdev->skb_tx_rsvd);
2125         task->hdr = (struct iscsi_hdr *)tdata->skb->data;
2126         task->hdr_max = SKB_TX_ISCSI_PDU_HEADER_MAX; /* BHS + AHS */
2127
2128         /* data_out uses scsi_cmd's itt */
2129         if (opcode != ISCSI_OP_SCSI_DATA_OUT)
2130                 task_reserve_itt(task, &task->hdr->itt);
2131
2132         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2133                 "task 0x%p, op 0x%x, skb 0x%p,%u+%u/%u, itt 0x%x.\n",
2134                 task, opcode, tdata->skb, cdev->skb_tx_rsvd, headroom,
2135                 conn->max_xmit_dlength, ntohl(task->hdr->itt));
2136
2137         return 0;
2138 }
2139 EXPORT_SYMBOL_GPL(cxgbi_conn_alloc_pdu);
2140
2141 static inline void tx_skb_setmode(struct sk_buff *skb, int hcrc, int dcrc)
2142 {
2143         if (hcrc || dcrc) {
2144                 u8 submode = 0;
2145
2146                 if (hcrc)
2147                         submode |= 1;
2148                 if (dcrc)
2149                         submode |= 2;
2150                 cxgbi_skcb_ulp_mode(skb) = (ULP2_MODE_ISCSI << 4) | submode;
2151         } else
2152                 cxgbi_skcb_ulp_mode(skb) = 0;
2153 }
2154
2155 int cxgbi_conn_init_pdu(struct iscsi_task *task, unsigned int offset,
2156                               unsigned int count)
2157 {
2158         struct iscsi_conn *conn = task->conn;
2159         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2160         struct sk_buff *skb = tdata->skb;
2161         unsigned int datalen = count;
2162         int i, padlen = iscsi_padding(count);
2163         struct page *pg;
2164
2165         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2166                 "task 0x%p,0x%p, skb 0x%p, 0x%x,0x%x,0x%x, %u+%u.\n",
2167                 task, task->sc, skb, (*skb->data) & ISCSI_OPCODE_MASK,
2168                 ntohl(task->cmdsn), ntohl(task->hdr->itt), offset, count);
2169
2170         skb_put(skb, task->hdr_len);
2171         tx_skb_setmode(skb, conn->hdrdgst_en, datalen ? conn->datadgst_en : 0);
2172         if (!count)
2173                 return 0;
2174
2175         if (task->sc) {
2176                 struct scsi_data_buffer *sdb = scsi_out(task->sc);
2177                 struct scatterlist *sg = NULL;
2178                 int err;
2179
2180                 tdata->offset = offset;
2181                 tdata->count = count;
2182                 err = sgl_seek_offset(
2183                                         sdb->table.sgl, sdb->table.nents,
2184                                         tdata->offset, &tdata->sgoffset, &sg);
2185                 if (err < 0) {
2186                         pr_warn("tpdu, sgl %u, bad offset %u/%u.\n",
2187                                 sdb->table.nents, tdata->offset, sdb->length);
2188                         return err;
2189                 }
2190                 err = sgl_read_to_frags(sg, tdata->sgoffset, tdata->count,
2191                                         tdata->frags, MAX_PDU_FRAGS);
2192                 if (err < 0) {
2193                         pr_warn("tpdu, sgl %u, bad offset %u + %u.\n",
2194                                 sdb->table.nents, tdata->offset, tdata->count);
2195                         return err;
2196                 }
2197                 tdata->nr_frags = err;
2198
2199                 if (tdata->nr_frags > MAX_SKB_FRAGS ||
2200                     (padlen && tdata->nr_frags == MAX_SKB_FRAGS)) {
2201                         char *dst = skb->data + task->hdr_len;
2202                         struct page_frag *frag = tdata->frags;
2203
2204                         /* data fits in the skb's headroom */
2205                         for (i = 0; i < tdata->nr_frags; i++, frag++) {
2206                                 char *src = kmap_atomic(frag->page);
2207
2208                                 memcpy(dst, src+frag->offset, frag->size);
2209                                 dst += frag->size;
2210                                 kunmap_atomic(src);
2211                         }
2212                         if (padlen) {
2213                                 memset(dst, 0, padlen);
2214                                 padlen = 0;
2215                         }
2216                         skb_put(skb, count + padlen);
2217                 } else {
2218                         /* data fit into frag_list */
2219                         for (i = 0; i < tdata->nr_frags; i++) {
2220                                 __skb_fill_page_desc(skb, i,
2221                                                 tdata->frags[i].page,
2222                                                 tdata->frags[i].offset,
2223                                                 tdata->frags[i].size);
2224                                 skb_frag_ref(skb, i);
2225                         }
2226                         skb_shinfo(skb)->nr_frags = tdata->nr_frags;
2227                         skb->len += count;
2228                         skb->data_len += count;
2229                         skb->truesize += count;
2230                 }
2231
2232         } else {
2233                 pg = virt_to_page(task->data);
2234
2235                 get_page(pg);
2236                 skb_fill_page_desc(skb, 0, pg, offset_in_page(task->data),
2237                                         count);
2238                 skb->len += count;
2239                 skb->data_len += count;
2240                 skb->truesize += count;
2241         }
2242
2243         if (padlen) {
2244                 i = skb_shinfo(skb)->nr_frags;
2245                 skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags,
2246                                 virt_to_page(padding), offset_in_page(padding),
2247                                 padlen);
2248
2249                 skb->data_len += padlen;
2250                 skb->truesize += padlen;
2251                 skb->len += padlen;
2252         }
2253
2254         return 0;
2255 }
2256 EXPORT_SYMBOL_GPL(cxgbi_conn_init_pdu);
2257
2258 int cxgbi_conn_xmit_pdu(struct iscsi_task *task)
2259 {
2260         struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
2261         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2262         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2263         struct sk_buff *skb = tdata->skb;
2264         unsigned int datalen;
2265         int err;
2266
2267         if (!skb) {
2268                 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2269                         "task 0x%p, skb NULL.\n", task);
2270                 return 0;
2271         }
2272
2273         datalen = skb->data_len;
2274         tdata->skb = NULL;
2275         err = cxgbi_sock_send_pdus(cconn->cep->csk, skb);
2276         if (err > 0) {
2277                 int pdulen = err;
2278
2279                 log_debug(1 << CXGBI_DBG_PDU_TX,
2280                         "task 0x%p,0x%p, skb 0x%p, len %u/%u, rv %d.\n",
2281                         task, task->sc, skb, skb->len, skb->data_len, err);
2282
2283                 if (task->conn->hdrdgst_en)
2284                         pdulen += ISCSI_DIGEST_SIZE;
2285
2286                 if (datalen && task->conn->datadgst_en)
2287                         pdulen += ISCSI_DIGEST_SIZE;
2288
2289                 task->conn->txdata_octets += pdulen;
2290                 return 0;
2291         }
2292
2293         if (err == -EAGAIN || err == -ENOBUFS) {
2294                 log_debug(1 << CXGBI_DBG_PDU_TX,
2295                         "task 0x%p, skb 0x%p, len %u/%u, %d EAGAIN.\n",
2296                         task, skb, skb->len, skb->data_len, err);
2297                 /* reset skb to send when we are called again */
2298                 tdata->skb = skb;
2299                 return err;
2300         }
2301
2302         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2303                 "itt 0x%x, skb 0x%p, len %u/%u, xmit err %d.\n",
2304                 task->itt, skb, skb->len, skb->data_len, err);
2305
2306         kfree_skb(skb);
2307
2308         iscsi_conn_printk(KERN_ERR, task->conn, "xmit err %d.\n", err);
2309         iscsi_conn_failure(task->conn, ISCSI_ERR_XMIT_FAILED);
2310         return err;
2311 }
2312 EXPORT_SYMBOL_GPL(cxgbi_conn_xmit_pdu);
2313
2314 void cxgbi_cleanup_task(struct iscsi_task *task)
2315 {
2316         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2317
2318         log_debug(1 << CXGBI_DBG_ISCSI,
2319                 "task 0x%p, skb 0x%p, itt 0x%x.\n",
2320                 task, tdata->skb, task->hdr_itt);
2321
2322         /*  never reached the xmit task callout */
2323         if (tdata->skb)
2324                 __kfree_skb(tdata->skb);
2325         memset(tdata, 0, sizeof(*tdata));
2326
2327         task_release_itt(task, task->hdr_itt);
2328         iscsi_tcp_cleanup_task(task);
2329 }
2330 EXPORT_SYMBOL_GPL(cxgbi_cleanup_task);
2331
2332 void cxgbi_get_conn_stats(struct iscsi_cls_conn *cls_conn,
2333                                 struct iscsi_stats *stats)
2334 {
2335         struct iscsi_conn *conn = cls_conn->dd_data;
2336
2337         stats->txdata_octets = conn->txdata_octets;
2338         stats->rxdata_octets = conn->rxdata_octets;
2339         stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
2340         stats->dataout_pdus = conn->dataout_pdus_cnt;
2341         stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
2342         stats->datain_pdus = conn->datain_pdus_cnt;
2343         stats->r2t_pdus = conn->r2t_pdus_cnt;
2344         stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
2345         stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
2346         stats->digest_err = 0;
2347         stats->timeout_err = 0;
2348         stats->custom_length = 1;
2349         strcpy(stats->custom[0].desc, "eh_abort_cnt");
2350         stats->custom[0].value = conn->eh_abort_cnt;
2351 }
2352 EXPORT_SYMBOL_GPL(cxgbi_get_conn_stats);
2353
2354 static int cxgbi_conn_max_xmit_dlength(struct iscsi_conn *conn)
2355 {
2356         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2357         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2358         struct cxgbi_device *cdev = cconn->chba->cdev;
2359         unsigned int headroom = SKB_MAX_HEAD(cdev->skb_tx_rsvd);
2360         unsigned int max_def = 512 * MAX_SKB_FRAGS;
2361         unsigned int max = max(max_def, headroom);
2362
2363         max = min(cconn->chba->cdev->tx_max_size, max);
2364         if (conn->max_xmit_dlength)
2365                 conn->max_xmit_dlength = min(conn->max_xmit_dlength, max);
2366         else
2367                 conn->max_xmit_dlength = max;
2368         cxgbi_align_pdu_size(conn->max_xmit_dlength);
2369
2370         return 0;
2371 }
2372
2373 static int cxgbi_conn_max_recv_dlength(struct iscsi_conn *conn)
2374 {
2375         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2376         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2377         unsigned int max = cconn->chba->cdev->rx_max_size;
2378
2379         cxgbi_align_pdu_size(max);
2380
2381         if (conn->max_recv_dlength) {
2382                 if (conn->max_recv_dlength > max) {
2383                         pr_err("MaxRecvDataSegmentLength %u > %u.\n",
2384                                 conn->max_recv_dlength, max);
2385                         return -EINVAL;
2386                 }
2387                 conn->max_recv_dlength = min(conn->max_recv_dlength, max);
2388                 cxgbi_align_pdu_size(conn->max_recv_dlength);
2389         } else
2390                 conn->max_recv_dlength = max;
2391
2392         return 0;
2393 }
2394
2395 int cxgbi_set_conn_param(struct iscsi_cls_conn *cls_conn,
2396                         enum iscsi_param param, char *buf, int buflen)
2397 {
2398         struct iscsi_conn *conn = cls_conn->dd_data;
2399         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2400         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2401         struct cxgbi_sock *csk = cconn->cep->csk;
2402         int err;
2403
2404         log_debug(1 << CXGBI_DBG_ISCSI,
2405                 "cls_conn 0x%p, param %d, buf(%d) %s.\n",
2406                 cls_conn, param, buflen, buf);
2407
2408         switch (param) {
2409         case ISCSI_PARAM_HDRDGST_EN:
2410                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2411                 if (!err && conn->hdrdgst_en)
2412                         err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2413                                                         conn->hdrdgst_en,
2414                                                         conn->datadgst_en, 0);
2415                 break;
2416         case ISCSI_PARAM_DATADGST_EN:
2417                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2418                 if (!err && conn->datadgst_en)
2419                         err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2420                                                         conn->hdrdgst_en,
2421                                                         conn->datadgst_en, 0);
2422                 break;
2423         case ISCSI_PARAM_MAX_R2T:
2424                 return iscsi_tcp_set_max_r2t(conn, buf);
2425         case ISCSI_PARAM_MAX_RECV_DLENGTH:
2426                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2427                 if (!err)
2428                         err = cxgbi_conn_max_recv_dlength(conn);
2429                 break;
2430         case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2431                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2432                 if (!err)
2433                         err = cxgbi_conn_max_xmit_dlength(conn);
2434                 break;
2435         default:
2436                 return iscsi_set_param(cls_conn, param, buf, buflen);
2437         }
2438         return err;
2439 }
2440 EXPORT_SYMBOL_GPL(cxgbi_set_conn_param);
2441
2442 static inline int csk_print_port(struct cxgbi_sock *csk, char *buf)
2443 {
2444         int len;
2445
2446         cxgbi_sock_get(csk);
2447         len = sprintf(buf, "%hu\n", ntohs(csk->daddr.sin_port));
2448         cxgbi_sock_put(csk);
2449
2450         return len;
2451 }
2452
2453 static inline int csk_print_ip(struct cxgbi_sock *csk, char *buf)
2454 {
2455         int len;
2456
2457         cxgbi_sock_get(csk);
2458         if (csk->csk_family == AF_INET)
2459                 len = sprintf(buf, "%pI4",
2460                               &csk->daddr.sin_addr.s_addr);
2461         else
2462                 len = sprintf(buf, "%pI6",
2463                               &csk->daddr6.sin6_addr);
2464
2465         cxgbi_sock_put(csk);
2466
2467         return len;
2468 }
2469
2470 int cxgbi_get_ep_param(struct iscsi_endpoint *ep, enum iscsi_param param,
2471                        char *buf)
2472 {
2473         struct cxgbi_endpoint *cep = ep->dd_data;
2474         struct cxgbi_sock *csk;
2475         int len;
2476
2477         log_debug(1 << CXGBI_DBG_ISCSI,
2478                 "cls_conn 0x%p, param %d.\n", ep, param);
2479
2480         switch (param) {
2481         case ISCSI_PARAM_CONN_PORT:
2482         case ISCSI_PARAM_CONN_ADDRESS:
2483                 if (!cep)
2484                         return -ENOTCONN;
2485
2486                 csk = cep->csk;
2487                 if (!csk)
2488                         return -ENOTCONN;
2489
2490                 return iscsi_conn_get_addr_param((struct sockaddr_storage *)
2491                                                  &csk->daddr, param, buf);
2492         default:
2493                 return -ENOSYS;
2494         }
2495         return len;
2496 }
2497 EXPORT_SYMBOL_GPL(cxgbi_get_ep_param);
2498
2499 struct iscsi_cls_conn *
2500 cxgbi_create_conn(struct iscsi_cls_session *cls_session, u32 cid)
2501 {
2502         struct iscsi_cls_conn *cls_conn;
2503         struct iscsi_conn *conn;
2504         struct iscsi_tcp_conn *tcp_conn;
2505         struct cxgbi_conn *cconn;
2506
2507         cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*cconn), cid);
2508         if (!cls_conn)
2509                 return NULL;
2510
2511         conn = cls_conn->dd_data;
2512         tcp_conn = conn->dd_data;
2513         cconn = tcp_conn->dd_data;
2514         cconn->iconn = conn;
2515
2516         log_debug(1 << CXGBI_DBG_ISCSI,
2517                 "cid %u(0x%x), cls 0x%p,0x%p, conn 0x%p,0x%p,0x%p.\n",
2518                 cid, cid, cls_session, cls_conn, conn, tcp_conn, cconn);
2519
2520         return cls_conn;
2521 }
2522 EXPORT_SYMBOL_GPL(cxgbi_create_conn);
2523
2524 int cxgbi_bind_conn(struct iscsi_cls_session *cls_session,
2525                                 struct iscsi_cls_conn *cls_conn,
2526                                 u64 transport_eph, int is_leading)
2527 {
2528         struct iscsi_conn *conn = cls_conn->dd_data;
2529         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2530         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2531         struct iscsi_endpoint *ep;
2532         struct cxgbi_endpoint *cep;
2533         struct cxgbi_sock *csk;
2534         int err;
2535
2536         ep = iscsi_lookup_endpoint(transport_eph);
2537         if (!ep)
2538                 return -EINVAL;
2539
2540         /*  setup ddp pagesize */
2541         cep = ep->dd_data;
2542         csk = cep->csk;
2543         err = csk->cdev->csk_ddp_setup_pgidx(csk, csk->tid, page_idx, 0);
2544         if (err < 0)
2545                 return err;
2546
2547         err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
2548         if (err)
2549                 return -EINVAL;
2550
2551         /*  calculate the tag idx bits needed for this conn based on cmds_max */
2552         cconn->task_idx_bits = (__ilog2_u32(conn->session->cmds_max - 1)) + 1;
2553
2554         write_lock_bh(&csk->callback_lock);
2555         csk->user_data = conn;
2556         cconn->chba = cep->chba;
2557         cconn->cep = cep;
2558         cep->cconn = cconn;
2559         write_unlock_bh(&csk->callback_lock);
2560
2561         cxgbi_conn_max_xmit_dlength(conn);
2562         cxgbi_conn_max_recv_dlength(conn);
2563
2564         log_debug(1 << CXGBI_DBG_ISCSI,
2565                 "cls 0x%p,0x%p, ep 0x%p, cconn 0x%p, csk 0x%p.\n",
2566                 cls_session, cls_conn, ep, cconn, csk);
2567         /*  init recv engine */
2568         iscsi_tcp_hdr_recv_prep(tcp_conn);
2569
2570         return 0;
2571 }
2572 EXPORT_SYMBOL_GPL(cxgbi_bind_conn);
2573
2574 struct iscsi_cls_session *cxgbi_create_session(struct iscsi_endpoint *ep,
2575                                                 u16 cmds_max, u16 qdepth,
2576                                                 u32 initial_cmdsn)
2577 {
2578         struct cxgbi_endpoint *cep;
2579         struct cxgbi_hba *chba;
2580         struct Scsi_Host *shost;
2581         struct iscsi_cls_session *cls_session;
2582         struct iscsi_session *session;
2583
2584         if (!ep) {
2585                 pr_err("missing endpoint.\n");
2586                 return NULL;
2587         }
2588
2589         cep = ep->dd_data;
2590         chba = cep->chba;
2591         shost = chba->shost;
2592
2593         BUG_ON(chba != iscsi_host_priv(shost));
2594
2595         cls_session = iscsi_session_setup(chba->cdev->itp, shost,
2596                                         cmds_max, 0,
2597                                         sizeof(struct iscsi_tcp_task) +
2598                                         sizeof(struct cxgbi_task_data),
2599                                         initial_cmdsn, ISCSI_MAX_TARGET);
2600         if (!cls_session)
2601                 return NULL;
2602
2603         session = cls_session->dd_data;
2604         if (iscsi_tcp_r2tpool_alloc(session))
2605                 goto remove_session;
2606
2607         log_debug(1 << CXGBI_DBG_ISCSI,
2608                 "ep 0x%p, cls sess 0x%p.\n", ep, cls_session);
2609         return cls_session;
2610
2611 remove_session:
2612         iscsi_session_teardown(cls_session);
2613         return NULL;
2614 }
2615 EXPORT_SYMBOL_GPL(cxgbi_create_session);
2616
2617 void cxgbi_destroy_session(struct iscsi_cls_session *cls_session)
2618 {
2619         log_debug(1 << CXGBI_DBG_ISCSI,
2620                 "cls sess 0x%p.\n", cls_session);
2621
2622         iscsi_tcp_r2tpool_free(cls_session->dd_data);
2623         iscsi_session_teardown(cls_session);
2624 }
2625 EXPORT_SYMBOL_GPL(cxgbi_destroy_session);
2626
2627 int cxgbi_set_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2628                         char *buf, int buflen)
2629 {
2630         struct cxgbi_hba *chba = iscsi_host_priv(shost);
2631
2632         if (!chba->ndev) {
2633                 shost_printk(KERN_ERR, shost, "Could not get host param. "
2634                                 "netdev for host not set.\n");
2635                 return -ENODEV;
2636         }
2637
2638         log_debug(1 << CXGBI_DBG_ISCSI,
2639                 "shost 0x%p, hba 0x%p,%s, param %d, buf(%d) %s.\n",
2640                 shost, chba, chba->ndev->name, param, buflen, buf);
2641
2642         switch (param) {
2643         case ISCSI_HOST_PARAM_IPADDRESS:
2644         {
2645                 __be32 addr = in_aton(buf);
2646                 log_debug(1 << CXGBI_DBG_ISCSI,
2647                         "hba %s, req. ipv4 %pI4.\n", chba->ndev->name, &addr);
2648                 cxgbi_set_iscsi_ipv4(chba, addr);
2649                 return 0;
2650         }
2651         case ISCSI_HOST_PARAM_HWADDRESS:
2652         case ISCSI_HOST_PARAM_NETDEV_NAME:
2653                 return 0;
2654         default:
2655                 return iscsi_host_set_param(shost, param, buf, buflen);
2656         }
2657 }
2658 EXPORT_SYMBOL_GPL(cxgbi_set_host_param);
2659
2660 int cxgbi_get_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2661                         char *buf)
2662 {
2663         struct cxgbi_hba *chba = iscsi_host_priv(shost);
2664         int len = 0;
2665
2666         if (!chba->ndev) {
2667                 shost_printk(KERN_ERR, shost, "Could not get host param. "
2668                                 "netdev for host not set.\n");
2669                 return -ENODEV;
2670         }
2671
2672         log_debug(1 << CXGBI_DBG_ISCSI,
2673                 "shost 0x%p, hba 0x%p,%s, param %d.\n",
2674                 shost, chba, chba->ndev->name, param);
2675
2676         switch (param) {
2677         case ISCSI_HOST_PARAM_HWADDRESS:
2678                 len = sysfs_format_mac(buf, chba->ndev->dev_addr, 6);
2679                 break;
2680         case ISCSI_HOST_PARAM_NETDEV_NAME:
2681                 len = sprintf(buf, "%s\n", chba->ndev->name);
2682                 break;
2683         case ISCSI_HOST_PARAM_IPADDRESS:
2684         {
2685                 struct cxgbi_sock *csk = find_sock_on_port(chba->cdev,
2686                                                            chba->port_id);
2687                 if (csk) {
2688                         len = sprintf(buf, "%pIS",
2689                                       (struct sockaddr *)&csk->saddr);
2690                 }
2691                 log_debug(1 << CXGBI_DBG_ISCSI,
2692                           "hba %s, addr %s.\n", chba->ndev->name, buf);
2693                 break;
2694         }
2695         default:
2696                 return iscsi_host_get_param(shost, param, buf);
2697         }
2698
2699         return len;
2700 }
2701 EXPORT_SYMBOL_GPL(cxgbi_get_host_param);
2702
2703 struct iscsi_endpoint *cxgbi_ep_connect(struct Scsi_Host *shost,
2704                                         struct sockaddr *dst_addr,
2705                                         int non_blocking)
2706 {
2707         struct iscsi_endpoint *ep;
2708         struct cxgbi_endpoint *cep;
2709         struct cxgbi_hba *hba = NULL;
2710         struct cxgbi_sock *csk;
2711         int err = -EINVAL;
2712
2713         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2714                 "shost 0x%p, non_blocking %d, dst_addr 0x%p.\n",
2715                 shost, non_blocking, dst_addr);
2716
2717         if (shost) {
2718                 hba = iscsi_host_priv(shost);
2719                 if (!hba) {
2720                         pr_info("shost 0x%p, priv NULL.\n", shost);
2721                         goto err_out;
2722                 }
2723         }
2724
2725         if (dst_addr->sa_family == AF_INET) {
2726                 csk = cxgbi_check_route(dst_addr);
2727 #if IS_ENABLED(CONFIG_IPV6)
2728         } else if (dst_addr->sa_family == AF_INET6) {
2729                 csk = cxgbi_check_route6(dst_addr);
2730 #endif
2731         } else {
2732                 pr_info("address family 0x%x NOT supported.\n",
2733                         dst_addr->sa_family);
2734                 err = -EAFNOSUPPORT;
2735                 return (struct iscsi_endpoint *)ERR_PTR(err);
2736         }
2737
2738         if (IS_ERR(csk))
2739                 return (struct iscsi_endpoint *)csk;
2740         cxgbi_sock_get(csk);
2741
2742         if (!hba)
2743                 hba = csk->cdev->hbas[csk->port_id];
2744         else if (hba != csk->cdev->hbas[csk->port_id]) {
2745                 pr_info("Could not connect through requested host %u"
2746                         "hba 0x%p != 0x%p (%u).\n",
2747                         shost->host_no, hba,
2748                         csk->cdev->hbas[csk->port_id], csk->port_id);
2749                 err = -ENOSPC;
2750                 goto release_conn;
2751         }
2752
2753         err = sock_get_port(csk);
2754         if (err)
2755                 goto release_conn;
2756
2757         cxgbi_sock_set_state(csk, CTP_CONNECTING);
2758         err = csk->cdev->csk_init_act_open(csk);
2759         if (err)
2760                 goto release_conn;
2761
2762         if (cxgbi_sock_is_closing(csk)) {
2763                 err = -ENOSPC;
2764                 pr_info("csk 0x%p is closing.\n", csk);
2765                 goto release_conn;
2766         }
2767
2768         ep = iscsi_create_endpoint(sizeof(*cep));
2769         if (!ep) {
2770                 err = -ENOMEM;
2771                 pr_info("iscsi alloc ep, OOM.\n");
2772                 goto release_conn;
2773         }
2774
2775         cep = ep->dd_data;
2776         cep->csk = csk;
2777         cep->chba = hba;
2778
2779         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2780                 "ep 0x%p, cep 0x%p, csk 0x%p, hba 0x%p,%s.\n",
2781                 ep, cep, csk, hba, hba->ndev->name);
2782         return ep;
2783
2784 release_conn:
2785         cxgbi_sock_put(csk);
2786         cxgbi_sock_closed(csk);
2787 err_out:
2788         return ERR_PTR(err);
2789 }
2790 EXPORT_SYMBOL_GPL(cxgbi_ep_connect);
2791
2792 int cxgbi_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
2793 {
2794         struct cxgbi_endpoint *cep = ep->dd_data;
2795         struct cxgbi_sock *csk = cep->csk;
2796
2797         if (!cxgbi_sock_is_established(csk))
2798                 return 0;
2799         return 1;
2800 }
2801 EXPORT_SYMBOL_GPL(cxgbi_ep_poll);
2802
2803 void cxgbi_ep_disconnect(struct iscsi_endpoint *ep)
2804 {
2805         struct cxgbi_endpoint *cep = ep->dd_data;
2806         struct cxgbi_conn *cconn = cep->cconn;
2807         struct cxgbi_sock *csk = cep->csk;
2808
2809         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2810                 "ep 0x%p, cep 0x%p, cconn 0x%p, csk 0x%p,%u,0x%lx.\n",
2811                 ep, cep, cconn, csk, csk->state, csk->flags);
2812
2813         if (cconn && cconn->iconn) {
2814                 iscsi_suspend_tx(cconn->iconn);
2815                 write_lock_bh(&csk->callback_lock);
2816                 cep->csk->user_data = NULL;
2817                 cconn->cep = NULL;
2818                 write_unlock_bh(&csk->callback_lock);
2819         }
2820         iscsi_destroy_endpoint(ep);
2821
2822         if (likely(csk->state >= CTP_ESTABLISHED))
2823                 need_active_close(csk);
2824         else
2825                 cxgbi_sock_closed(csk);
2826
2827         cxgbi_sock_put(csk);
2828 }
2829 EXPORT_SYMBOL_GPL(cxgbi_ep_disconnect);
2830
2831 int cxgbi_iscsi_init(struct iscsi_transport *itp,
2832                         struct scsi_transport_template **stt)
2833 {
2834         *stt = iscsi_register_transport(itp);
2835         if (*stt == NULL) {
2836                 pr_err("unable to register %s transport 0x%p.\n",
2837                         itp->name, itp);
2838                 return -ENODEV;
2839         }
2840         log_debug(1 << CXGBI_DBG_ISCSI,
2841                 "%s, registered iscsi transport 0x%p.\n",
2842                 itp->name, stt);
2843         return 0;
2844 }
2845 EXPORT_SYMBOL_GPL(cxgbi_iscsi_init);
2846
2847 void cxgbi_iscsi_cleanup(struct iscsi_transport *itp,
2848                         struct scsi_transport_template **stt)
2849 {
2850         if (*stt) {
2851                 log_debug(1 << CXGBI_DBG_ISCSI,
2852                         "de-register transport 0x%p, %s, stt 0x%p.\n",
2853                         itp, itp->name, *stt);
2854                 *stt = NULL;
2855                 iscsi_unregister_transport(itp);
2856         }
2857 }
2858 EXPORT_SYMBOL_GPL(cxgbi_iscsi_cleanup);
2859
2860 umode_t cxgbi_attr_is_visible(int param_type, int param)
2861 {
2862         switch (param_type) {
2863         case ISCSI_HOST_PARAM:
2864                 switch (param) {
2865                 case ISCSI_HOST_PARAM_NETDEV_NAME:
2866                 case ISCSI_HOST_PARAM_HWADDRESS:
2867                 case ISCSI_HOST_PARAM_IPADDRESS:
2868                 case ISCSI_HOST_PARAM_INITIATOR_NAME:
2869                         return S_IRUGO;
2870                 default:
2871                         return 0;
2872                 }
2873         case ISCSI_PARAM:
2874                 switch (param) {
2875                 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2876                 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2877                 case ISCSI_PARAM_HDRDGST_EN:
2878                 case ISCSI_PARAM_DATADGST_EN:
2879                 case ISCSI_PARAM_CONN_ADDRESS:
2880                 case ISCSI_PARAM_CONN_PORT:
2881                 case ISCSI_PARAM_EXP_STATSN:
2882                 case ISCSI_PARAM_PERSISTENT_ADDRESS:
2883                 case ISCSI_PARAM_PERSISTENT_PORT:
2884                 case ISCSI_PARAM_PING_TMO:
2885                 case ISCSI_PARAM_RECV_TMO:
2886                 case ISCSI_PARAM_INITIAL_R2T_EN:
2887                 case ISCSI_PARAM_MAX_R2T:
2888                 case ISCSI_PARAM_IMM_DATA_EN:
2889                 case ISCSI_PARAM_FIRST_BURST:
2890                 case ISCSI_PARAM_MAX_BURST:
2891                 case ISCSI_PARAM_PDU_INORDER_EN:
2892                 case ISCSI_PARAM_DATASEQ_INORDER_EN:
2893                 case ISCSI_PARAM_ERL:
2894                 case ISCSI_PARAM_TARGET_NAME:
2895                 case ISCSI_PARAM_TPGT:
2896                 case ISCSI_PARAM_USERNAME:
2897                 case ISCSI_PARAM_PASSWORD:
2898                 case ISCSI_PARAM_USERNAME_IN:
2899                 case ISCSI_PARAM_PASSWORD_IN:
2900                 case ISCSI_PARAM_FAST_ABORT:
2901                 case ISCSI_PARAM_ABORT_TMO:
2902                 case ISCSI_PARAM_LU_RESET_TMO:
2903                 case ISCSI_PARAM_TGT_RESET_TMO:
2904                 case ISCSI_PARAM_IFACE_NAME:
2905                 case ISCSI_PARAM_INITIATOR_NAME:
2906                         return S_IRUGO;
2907                 default:
2908                         return 0;
2909                 }
2910         }
2911
2912         return 0;
2913 }
2914 EXPORT_SYMBOL_GPL(cxgbi_attr_is_visible);
2915
2916 static int __init libcxgbi_init_module(void)
2917 {
2918         sw_tag_idx_bits = (__ilog2_u32(ISCSI_ITT_MASK)) + 1;
2919         sw_tag_age_bits = (__ilog2_u32(ISCSI_AGE_MASK)) + 1;
2920
2921         pr_info("%s", version);
2922
2923         pr_info("tag itt 0x%x, %u bits, age 0x%x, %u bits.\n",
2924                 ISCSI_ITT_MASK, sw_tag_idx_bits,
2925                 ISCSI_AGE_MASK, sw_tag_age_bits);
2926
2927         ddp_setup_host_page_size();
2928         return 0;
2929 }
2930
2931 static void __exit libcxgbi_exit_module(void)
2932 {
2933         cxgbi_device_unregister_all(0xFF);
2934         return;
2935 }
2936
2937 module_init(libcxgbi_init_module);
2938 module_exit(libcxgbi_exit_module);