drivers/scsi/cxgbi/libcxgbi.c

   1 /*
   2  * libcxgbi.c: Chelsio common library for T3/T4 iSCSI driver.
   3  *
   4  * Copyright (c) 2010-2015 Chelsio Communications, Inc.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation.
   9  *
  10  * Written by: Karen Xie (kxie@chelsio.com)
  11  * Written by: Rakesh Ranjan (rranjan@chelsio.com)
  12  */
  13
  14 #define pr_fmt(fmt)     KBUILD_MODNAME ":%s: " fmt, __func__
  15
  16 #include <linux/skbuff.h>
  17 #include <linux/crypto.h>
  18 #include <linux/scatterlist.h>
  19 #include <linux/pci.h>
  20 #include <scsi/scsi.h>
  21 #include <scsi/scsi_cmnd.h>
  22 #include <scsi/scsi_host.h>
  23 #include <linux/if_vlan.h>
  24 #include <linux/inet.h>
  25 #include <net/dst.h>
  26 #include <net/route.h>
  27 #include <net/ipv6.h>
  28 #include <net/ip6_route.h>
  29 #include <net/addrconf.h>
  30
  31 #include <linux/inetdevice.h>   /* ip_dev_find */
  32 #include <linux/module.h>
  33 #include <net/tcp.h>
  34
  35 static unsigned int dbg_level;
  36
  37 #include "libcxgbi.h"
  38
  39 #define DRV_MODULE_NAME         "libcxgbi"
  40 #define DRV_MODULE_DESC         "Chelsio iSCSI driver library"
  41 #define DRV_MODULE_VERSION      "0.9.1-ko"
  42 #define DRV_MODULE_RELDATE      "Apr. 2015"
  43
  44 static char version[] =
  45         DRV_MODULE_DESC " " DRV_MODULE_NAME
  46         " v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
  47
  48 MODULE_AUTHOR("Chelsio Communications, Inc.");
  49 MODULE_DESCRIPTION(DRV_MODULE_DESC);
  50 MODULE_VERSION(DRV_MODULE_VERSION);
  51 MODULE_LICENSE("GPL");
  52
  53 module_param(dbg_level, uint, 0644);
  54 MODULE_PARM_DESC(dbg_level, "libiscsi debug level (default=0)");
  55
  56
  57 /*
  58  * cxgbi device management
  59  * maintains a list of the cxgbi devices
  60  */
  61 static LIST_HEAD(cdev_list);
  62 static DEFINE_MUTEX(cdev_mutex);
  63
  64 static LIST_HEAD(cdev_rcu_list);
  65 static DEFINE_SPINLOCK(cdev_rcu_lock);
  66
  67 static inline void cxgbi_decode_sw_tag(u32 sw_tag, int *idx, int *age)
  68 {
  69         if (age)
  70                 *age = sw_tag & 0x7FFF;
  71         if (idx)
  72                 *idx = (sw_tag >> 16) & 0x7FFF;
  73 }
  74
  75 int cxgbi_device_portmap_create(struct cxgbi_device *cdev, unsigned int base,
  76                                 unsigned int max_conn)
  77 {
  78         struct cxgbi_ports_map *pmap = &cdev->pmap;
  79
  80         pmap->port_csk = cxgbi_alloc_big_mem(max_conn *
  81                                              sizeof(struct cxgbi_sock *),
  82                                              GFP_KERNEL);
  83         if (!pmap->port_csk) {
  84                 pr_warn("cdev 0x%p, portmap OOM %u.\n", cdev, max_conn);
  85                 return -ENOMEM;
  86         }
  87
  88         pmap->max_connect = max_conn;
  89         pmap->sport_base = base;
  90         spin_lock_init(&pmap->lock);
  91         return 0;
  92 }
  93 EXPORT_SYMBOL_GPL(cxgbi_device_portmap_create);
  94
  95 void cxgbi_device_portmap_cleanup(struct cxgbi_device *cdev)
  96 {
  97         struct cxgbi_ports_map *pmap = &cdev->pmap;
  98         struct cxgbi_sock *csk;
  99         int i;
 100
 101         for (i = 0; i < pmap->max_connect; i++) {
 102                 if (pmap->port_csk[i]) {
 103                         csk = pmap->port_csk[i];
 104                         pmap->port_csk[i] = NULL;
 105                         log_debug(1 << CXGBI_DBG_SOCK,
 106                                 "csk 0x%p, cdev 0x%p, offload down.\n",
 107                                 csk, cdev);
 108                         spin_lock_bh(&csk->lock);
 109                         cxgbi_sock_set_flag(csk, CTPF_OFFLOAD_DOWN);
 110                         cxgbi_sock_closed(csk);
 111                         spin_unlock_bh(&csk->lock);
 112                         cxgbi_sock_put(csk);
 113                 }
 114         }
 115 }
 116 EXPORT_SYMBOL_GPL(cxgbi_device_portmap_cleanup);
 117
 118 static inline void cxgbi_device_destroy(struct cxgbi_device *cdev)
 119 {
 120         log_debug(1 << CXGBI_DBG_DEV,
 121                 "cdev 0x%p, p# %u.\n", cdev, cdev->nports);
 122         cxgbi_hbas_remove(cdev);
 123         cxgbi_device_portmap_cleanup(cdev);
 124         cxgbi_ppm_release(cdev->cdev2ppm(cdev));
 125         if (cdev->pmap.max_connect)
 126                 cxgbi_free_big_mem(cdev->pmap.port_csk);
 127         kfree(cdev);
 128 }
 129
 130 struct cxgbi_device *cxgbi_device_register(unsigned int extra,
 131                                            unsigned int nports)
 132 {
 133         struct cxgbi_device *cdev;
 134
 135         cdev = kzalloc(sizeof(*cdev) + extra + nports *
 136                         (sizeof(struct cxgbi_hba *) +
 137                          sizeof(struct net_device *)),
 138                         GFP_KERNEL);
 139         if (!cdev) {
 140                 pr_warn("nport %d, OOM.\n", nports);
 141                 return NULL;
 142         }
 143         cdev->ports = (struct net_device **)(cdev + 1);
 144         cdev->hbas = (struct cxgbi_hba **)(((char*)cdev->ports) + nports *
 145                                                 sizeof(struct net_device *));
 146         if (extra)
 147                 cdev->dd_data = ((char *)cdev->hbas) +
 148                                 nports * sizeof(struct cxgbi_hba *);
 149         spin_lock_init(&cdev->pmap.lock);
 150
 151         mutex_lock(&cdev_mutex);
 152         list_add_tail(&cdev->list_head, &cdev_list);
 153         mutex_unlock(&cdev_mutex);
 154
 155         spin_lock(&cdev_rcu_lock);
 156         list_add_tail_rcu(&cdev->rcu_node, &cdev_rcu_list);
 157         spin_unlock(&cdev_rcu_lock);
 158
 159         log_debug(1 << CXGBI_DBG_DEV,
 160                 "cdev 0x%p, p# %u.\n", cdev, nports);
 161         return cdev;
 162 }
 163 EXPORT_SYMBOL_GPL(cxgbi_device_register);
 164
 165 void cxgbi_device_unregister(struct cxgbi_device *cdev)
 166 {
 167         log_debug(1 << CXGBI_DBG_DEV,
 168                 "cdev 0x%p, p# %u,%s.\n",
 169                 cdev, cdev->nports, cdev->nports ? cdev->ports[0]->name : "");
 170
 171         mutex_lock(&cdev_mutex);
 172         list_del(&cdev->list_head);
 173         mutex_unlock(&cdev_mutex);
 174
 175         spin_lock(&cdev_rcu_lock);
 176         list_del_rcu(&cdev->rcu_node);
 177         spin_unlock(&cdev_rcu_lock);
 178         synchronize_rcu();
 179
 180         cxgbi_device_destroy(cdev);
 181 }
 182 EXPORT_SYMBOL_GPL(cxgbi_device_unregister);
 183
 184 void cxgbi_device_unregister_all(unsigned int flag)
 185 {
 186         struct cxgbi_device *cdev, *tmp;
 187
 188         mutex_lock(&cdev_mutex);
 189         list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
 190                 if ((cdev->flags & flag) == flag) {
 191                         mutex_unlock(&cdev_mutex);
 192                         cxgbi_device_unregister(cdev);
 193                         mutex_lock(&cdev_mutex);
 194                 }
 195         }
 196         mutex_unlock(&cdev_mutex);
 197 }
 198 EXPORT_SYMBOL_GPL(cxgbi_device_unregister_all);
 199
 200 struct cxgbi_device *cxgbi_device_find_by_lldev(void *lldev)
 201 {
 202         struct cxgbi_device *cdev, *tmp;
 203
 204         mutex_lock(&cdev_mutex);
 205         list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
 206                 if (cdev->lldev == lldev) {
 207                         mutex_unlock(&cdev_mutex);
 208                         return cdev;
 209                 }
 210         }
 211         mutex_unlock(&cdev_mutex);
 212
 213         log_debug(1 << CXGBI_DBG_DEV,
 214                 "lldev 0x%p, NO match found.\n", lldev);
 215         return NULL;
 216 }
 217 EXPORT_SYMBOL_GPL(cxgbi_device_find_by_lldev);
 218
 219 struct cxgbi_device *cxgbi_device_find_by_netdev(struct net_device *ndev,
 220                                                  int *port)
 221 {
 222         struct net_device *vdev = NULL;
 223         struct cxgbi_device *cdev, *tmp;
 224         int i;
 225
 226         if (ndev->priv_flags & IFF_802_1Q_VLAN) {
 227                 vdev = ndev;
 228                 ndev = vlan_dev_real_dev(ndev);
 229                 log_debug(1 << CXGBI_DBG_DEV,
 230                         "vlan dev %s -> %s.\n", vdev->name, ndev->name);
 231         }
 232
 233         mutex_lock(&cdev_mutex);
 234         list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
 235                 for (i = 0; i < cdev->nports; i++) {
 236                         if (ndev == cdev->ports[i]) {
 237                                 cdev->hbas[i]->vdev = vdev;
 238                                 mutex_unlock(&cdev_mutex);
 239                                 if (port)
 240                                         *port = i;
 241                                 return cdev;
 242                         }
 243                 }
 244         }
 245         mutex_unlock(&cdev_mutex);
 246         log_debug(1 << CXGBI_DBG_DEV,
 247                 "ndev 0x%p, %s, NO match found.\n", ndev, ndev->name);
 248         return NULL;
 249 }
 250 EXPORT_SYMBOL_GPL(cxgbi_device_find_by_netdev);
 251
 252 struct cxgbi_device *cxgbi_device_find_by_netdev_rcu(struct net_device *ndev,
 253                                                      int *port)
 254 {
 255         struct net_device *vdev = NULL;
 256         struct cxgbi_device *cdev;
 257         int i;
 258
 259         if (ndev->priv_flags & IFF_802_1Q_VLAN) {
 260                 vdev = ndev;
 261                 ndev = vlan_dev_real_dev(ndev);
 262                 pr_info("vlan dev %s -> %s.\n", vdev->name, ndev->name);
 263         }
 264
 265         rcu_read_lock();
 266         list_for_each_entry_rcu(cdev, &cdev_rcu_list, rcu_node) {
 267                 for (i = 0; i < cdev->nports; i++) {
 268                         if (ndev == cdev->ports[i]) {
 269                                 cdev->hbas[i]->vdev = vdev;
 270                                 rcu_read_unlock();
 271                                 if (port)
 272                                         *port = i;
 273                                 return cdev;
 274                         }
 275                 }
 276         }
 277         rcu_read_unlock();
 278
 279         log_debug(1 << CXGBI_DBG_DEV,
 280                   "ndev 0x%p, %s, NO match found.\n", ndev, ndev->name);
 281         return NULL;
 282 }
 283 EXPORT_SYMBOL_GPL(cxgbi_device_find_by_netdev_rcu);
 284
 285 #if IS_ENABLED(CONFIG_IPV6)
 286 static struct cxgbi_device *cxgbi_device_find_by_mac(struct net_device *ndev,
 287                                                      int *port)
 288 {
 289         struct net_device *vdev = NULL;
 290         struct cxgbi_device *cdev, *tmp;
 291         int i;
 292
 293         if (ndev->priv_flags & IFF_802_1Q_VLAN) {
 294                 vdev = ndev;
 295                 ndev = vlan_dev_real_dev(ndev);
 296                 pr_info("vlan dev %s -> %s.\n", vdev->name, ndev->name);
 297         }
 298
 299         mutex_lock(&cdev_mutex);
 300         list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
 301                 for (i = 0; i < cdev->nports; i++) {
 302                         if (!memcmp(ndev->dev_addr, cdev->ports[i]->dev_addr,
 303                                     MAX_ADDR_LEN)) {
 304                                 cdev->hbas[i]->vdev = vdev;
 305                                 mutex_unlock(&cdev_mutex);
 306                                 if (port)
 307                                         *port = i;
 308                                 return cdev;
 309                         }
 310                 }
 311         }
 312         mutex_unlock(&cdev_mutex);
 313         log_debug(1 << CXGBI_DBG_DEV,
 314                   "ndev 0x%p, %s, NO match mac found.\n",
 315                   ndev, ndev->name);
 316         return NULL;
 317 }
 318 #endif
 319
 320 void cxgbi_hbas_remove(struct cxgbi_device *cdev)
 321 {
 322         int i;
 323         struct cxgbi_hba *chba;
 324
 325         log_debug(1 << CXGBI_DBG_DEV,
 326                 "cdev 0x%p, p#%u.\n", cdev, cdev->nports);
 327
 328         for (i = 0; i < cdev->nports; i++) {
 329                 chba = cdev->hbas[i];
 330                 if (chba) {
 331                         cdev->hbas[i] = NULL;
 332                         iscsi_host_remove(chba->shost);
 333                         pci_dev_put(cdev->pdev);
 334                         iscsi_host_free(chba->shost);
 335                 }
 336         }
 337 }
 338 EXPORT_SYMBOL_GPL(cxgbi_hbas_remove);
 339
 340 int cxgbi_hbas_add(struct cxgbi_device *cdev, u64 max_lun,
 341                 unsigned int max_id, struct scsi_host_template *sht,
 342                 struct scsi_transport_template *stt)
 343 {
 344         struct cxgbi_hba *chba;
 345         struct Scsi_Host *shost;
 346         int i, err;
 347
 348         log_debug(1 << CXGBI_DBG_DEV, "cdev 0x%p, p#%u.\n", cdev, cdev->nports);
 349
 350         for (i = 0; i < cdev->nports; i++) {
 351                 shost = iscsi_host_alloc(sht, sizeof(*chba), 1);
 352                 if (!shost) {
 353                         pr_info("0x%p, p%d, %s, host alloc failed.\n",
 354                                 cdev, i, cdev->ports[i]->name);
 355                         err = -ENOMEM;
 356                         goto err_out;
 357                 }
 358
 359                 shost->transportt = stt;
 360                 shost->max_lun = max_lun;
 361                 shost->max_id = max_id;
 362                 shost->max_channel = 0;
 363                 shost->max_cmd_len = 16;
 364
 365                 chba = iscsi_host_priv(shost);
 366                 chba->cdev = cdev;
 367                 chba->ndev = cdev->ports[i];
 368                 chba->shost = shost;
 369
 370                 log_debug(1 << CXGBI_DBG_DEV,
 371                         "cdev 0x%p, p#%d %s: chba 0x%p.\n",
 372                         cdev, i, cdev->ports[i]->name, chba);
 373
 374                 pci_dev_get(cdev->pdev);
 375                 err = iscsi_host_add(shost, &cdev->pdev->dev);
 376                 if (err) {
 377                         pr_info("cdev 0x%p, p#%d %s, host add failed.\n",
 378                                 cdev, i, cdev->ports[i]->name);
 379                         pci_dev_put(cdev->pdev);
 380                         scsi_host_put(shost);
 381                         goto  err_out;
 382                 }
 383
 384                 cdev->hbas[i] = chba;
 385         }
 386
 387         return 0;
 388
 389 err_out:
 390         cxgbi_hbas_remove(cdev);
 391         return err;
 392 }
 393 EXPORT_SYMBOL_GPL(cxgbi_hbas_add);
 394
 395 /*
 396  * iSCSI offload
 397  *
 398  * - source port management
 399  *   To find a free source port in the port allocation map we use a very simple
 400  *   rotor scheme to look for the next free port.
 401  *
 402  *   If a source port has been specified make sure that it doesn't collide with
 403  *   our normal source port allocation map.  If it's outside the range of our
 404  *   allocation/deallocation scheme just let them use it.
 405  *
 406  *   If the source port is outside our allocation range, the caller is
 407  *   responsible for keeping track of their port usage.
 408  */
 409
 410 static struct cxgbi_sock *find_sock_on_port(struct cxgbi_device *cdev,
 411                                             unsigned char port_id)
 412 {
 413         struct cxgbi_ports_map *pmap = &cdev->pmap;
 414         unsigned int i;
 415         unsigned int used;
 416
 417         if (!pmap->max_connect || !pmap->used)
 418                 return NULL;
 419
 420         spin_lock_bh(&pmap->lock);
 421         used = pmap->used;
 422         for (i = 0; used && i < pmap->max_connect; i++) {
 423                 struct cxgbi_sock *csk = pmap->port_csk[i];
 424
 425                 if (csk) {
 426                         if (csk->port_id == port_id) {
 427                                 spin_unlock_bh(&pmap->lock);
 428                                 return csk;
 429                         }
 430                         used--;
 431                 }
 432         }
 433         spin_unlock_bh(&pmap->lock);
 434
 435         return NULL;
 436 }
 437
 438 static int sock_get_port(struct cxgbi_sock *csk)
 439 {
 440         struct cxgbi_device *cdev = csk->cdev;
 441         struct cxgbi_ports_map *pmap = &cdev->pmap;
 442         unsigned int start;
 443         int idx;
 444         __be16 *port;
 445
 446         if (!pmap->max_connect) {
 447                 pr_err("cdev 0x%p, p#%u %s, NO port map.\n",
 448                            cdev, csk->port_id, cdev->ports[csk->port_id]->name);
 449                 return -EADDRNOTAVAIL;
 450         }
 451
 452         if (csk->csk_family == AF_INET)
 453                 port = &csk->saddr.sin_port;
 454         else /* ipv6 */
 455                 port = &csk->saddr6.sin6_port;
 456
 457         if (*port) {
 458                 pr_err("source port NON-ZERO %u.\n",
 459                         ntohs(*port));
 460                 return -EADDRINUSE;
 461         }
 462
 463         spin_lock_bh(&pmap->lock);
 464         if (pmap->used >= pmap->max_connect) {
 465                 spin_unlock_bh(&pmap->lock);
 466                 pr_info("cdev 0x%p, p#%u %s, ALL ports used.\n",
 467                         cdev, csk->port_id, cdev->ports[csk->port_id]->name);
 468                 return -EADDRNOTAVAIL;
 469         }
 470
 471         start = idx = pmap->next;
 472         do {
 473                 if (++idx >= pmap->max_connect)
 474                         idx = 0;
 475                 if (!pmap->port_csk[idx]) {
 476                         pmap->used++;
 477                         *port = htons(pmap->sport_base + idx);
 478                         pmap->next = idx;
 479                         pmap->port_csk[idx] = csk;
 480                         spin_unlock_bh(&pmap->lock);
 481                         cxgbi_sock_get(csk);
 482                         log_debug(1 << CXGBI_DBG_SOCK,
 483                                 "cdev 0x%p, p#%u %s, p %u, %u.\n",
 484                                 cdev, csk->port_id,
 485                                 cdev->ports[csk->port_id]->name,
 486                                 pmap->sport_base + idx, pmap->next);
 487                         return 0;
 488                 }
 489         } while (idx != start);
 490         spin_unlock_bh(&pmap->lock);
 491
 492         /* should not happen */
 493         pr_warn("cdev 0x%p, p#%u %s, next %u?\n",
 494                 cdev, csk->port_id, cdev->ports[csk->port_id]->name,
 495                 pmap->next);
 496         return -EADDRNOTAVAIL;
 497 }
 498
 499 static void sock_put_port(struct cxgbi_sock *csk)
 500 {
 501         struct cxgbi_device *cdev = csk->cdev;
 502         struct cxgbi_ports_map *pmap = &cdev->pmap;
 503         __be16 *port;
 504
 505         if (csk->csk_family == AF_INET)
 506                 port = &csk->saddr.sin_port;
 507         else /* ipv6 */
 508                 port = &csk->saddr6.sin6_port;
 509
 510         if (*port) {
 511                 int idx = ntohs(*port) - pmap->sport_base;
 512
 513                 *port = 0;
 514                 if (idx < 0 || idx >= pmap->max_connect) {
 515                         pr_err("cdev 0x%p, p#%u %s, port %u OOR.\n",
 516                                 cdev, csk->port_id,
 517                                 cdev->ports[csk->port_id]->name,
 518                                 ntohs(*port));
 519                         return;
 520                 }
 521
 522                 spin_lock_bh(&pmap->lock);
 523                 pmap->port_csk[idx] = NULL;
 524                 pmap->used--;
 525                 spin_unlock_bh(&pmap->lock);
 526
 527                 log_debug(1 << CXGBI_DBG_SOCK,
 528                         "cdev 0x%p, p#%u %s, release %u.\n",
 529                         cdev, csk->port_id, cdev->ports[csk->port_id]->name,
 530                         pmap->sport_base + idx);
 531
 532                 cxgbi_sock_put(csk);
 533         }
 534 }
 535
 536 /*
 537  * iscsi tcp connection
 538  */
 539 void cxgbi_sock_free_cpl_skbs(struct cxgbi_sock *csk)
 540 {
 541         if (csk->cpl_close) {
 542                 kfree_skb(csk->cpl_close);
 543                 csk->cpl_close = NULL;
 544         }
 545         if (csk->cpl_abort_req) {
 546                 kfree_skb(csk->cpl_abort_req);
 547                 csk->cpl_abort_req = NULL;
 548         }
 549         if (csk->cpl_abort_rpl) {
 550                 kfree_skb(csk->cpl_abort_rpl);
 551                 csk->cpl_abort_rpl = NULL;
 552         }
 553 }
 554 EXPORT_SYMBOL_GPL(cxgbi_sock_free_cpl_skbs);
 555
 556 static struct cxgbi_sock *cxgbi_sock_create(struct cxgbi_device *cdev)
 557 {
 558         struct cxgbi_sock *csk = kzalloc(sizeof(*csk), GFP_NOIO);
 559
 560         if (!csk) {
 561                 pr_info("alloc csk %zu failed.\n", sizeof(*csk));
 562                 return NULL;
 563         }
 564
 565         if (cdev->csk_alloc_cpls(csk) < 0) {
 566                 pr_info("csk 0x%p, alloc cpls failed.\n", csk);
 567                 kfree(csk);
 568                 return NULL;
 569         }
 570
 571         spin_lock_init(&csk->lock);
 572         kref_init(&csk->refcnt);
 573         skb_queue_head_init(&csk->receive_queue);
 574         skb_queue_head_init(&csk->write_queue);
 575         setup_timer(&csk->retry_timer, NULL, (unsigned long)csk);
 576         rwlock_init(&csk->callback_lock);
 577         csk->cdev = cdev;
 578         csk->flags = 0;
 579         cxgbi_sock_set_state(csk, CTP_CLOSED);
 580
 581         log_debug(1 << CXGBI_DBG_SOCK, "cdev 0x%p, new csk 0x%p.\n", cdev, csk);
 582
 583         return csk;
 584 }
 585
 586 static struct rtable *find_route_ipv4(struct flowi4 *fl4,
 587                                       __be32 saddr, __be32 daddr,
 588                                       __be16 sport, __be16 dport, u8 tos)
 589 {
 590         struct rtable *rt;
 591
 592         rt = ip_route_output_ports(&init_net, fl4, NULL, daddr, saddr,
 593                                    dport, sport, IPPROTO_TCP, tos, 0);
 594         if (IS_ERR(rt))
 595                 return NULL;
 596
 597         return rt;
 598 }
 599
 600 static struct cxgbi_sock *cxgbi_check_route(struct sockaddr *dst_addr)
 601 {
 602         struct sockaddr_in *daddr = (struct sockaddr_in *)dst_addr;
 603         struct dst_entry *dst;
 604         struct net_device *ndev;
 605         struct cxgbi_device *cdev;
 606         struct rtable *rt = NULL;
 607         struct neighbour *n;
 608         struct flowi4 fl4;
 609         struct cxgbi_sock *csk = NULL;
 610         unsigned int mtu = 0;
 611         int port = 0xFFFF;
 612         int err = 0;
 613
 614         rt = find_route_ipv4(&fl4, 0, daddr->sin_addr.s_addr, 0, daddr->sin_port, 0);
 615         if (!rt) {
 616                 pr_info("no route to ipv4 0x%x, port %u.\n",
 617                         be32_to_cpu(daddr->sin_addr.s_addr),
 618                         be16_to_cpu(daddr->sin_port));
 619                 err = -ENETUNREACH;
 620                 goto err_out;
 621         }
 622         dst = &rt->dst;
 623         n = dst_neigh_lookup(dst, &daddr->sin_addr.s_addr);
 624         if (!n) {
 625                 err = -ENODEV;
 626                 goto rel_rt;
 627         }
 628         ndev = n->dev;
 629
 630         if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) {
 631                 pr_info("multi-cast route %pI4, port %u, dev %s.\n",
 632                         &daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
 633                         ndev->name);
 634                 err = -ENETUNREACH;
 635                 goto rel_neigh;
 636         }
 637
 638         if (ndev->flags & IFF_LOOPBACK) {
 639                 ndev = ip_dev_find(&init_net, daddr->sin_addr.s_addr);
 640                 mtu = ndev->mtu;
 641                 pr_info("rt dev %s, loopback -> %s, mtu %u.\n",
 642                         n->dev->name, ndev->name, mtu);
 643         }
 644
 645         cdev = cxgbi_device_find_by_netdev(ndev, &port);
 646         if (!cdev) {
 647                 pr_info("dst %pI4, %s, NOT cxgbi device.\n",
 648                         &daddr->sin_addr.s_addr, ndev->name);
 649                 err = -ENETUNREACH;
 650                 goto rel_neigh;
 651         }
 652         log_debug(1 << CXGBI_DBG_SOCK,
 653                 "route to %pI4 :%u, ndev p#%d,%s, cdev 0x%p.\n",
 654                 &daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
 655                            port, ndev->name, cdev);
 656
 657         csk = cxgbi_sock_create(cdev);
 658         if (!csk) {
 659                 err = -ENOMEM;
 660                 goto rel_neigh;
 661         }
 662         csk->cdev = cdev;
 663         csk->port_id = port;
 664         csk->mtu = mtu;
 665         csk->dst = dst;
 666
 667         csk->csk_family = AF_INET;
 668         csk->daddr.sin_addr.s_addr = daddr->sin_addr.s_addr;
 669         csk->daddr.sin_port = daddr->sin_port;
 670         csk->daddr.sin_family = daddr->sin_family;
 671         csk->saddr.sin_family = daddr->sin_family;
 672         csk->saddr.sin_addr.s_addr = fl4.saddr;
 673         neigh_release(n);
 674
 675         return csk;
 676
 677 rel_neigh:
 678         neigh_release(n);
 679
 680 rel_rt:
 681         ip_rt_put(rt);
 682         if (csk)
 683                 cxgbi_sock_closed(csk);
 684 err_out:
 685         return ERR_PTR(err);
 686 }
 687
 688 #if IS_ENABLED(CONFIG_IPV6)
 689 static struct rt6_info *find_route_ipv6(const struct in6_addr *saddr,
 690                                         const struct in6_addr *daddr)
 691 {
 692         struct flowi6 fl;
 693
 694         memset(&fl, 0, sizeof(fl));
 695         if (saddr)
 696                 memcpy(&fl.saddr, saddr, sizeof(struct in6_addr));
 697         if (daddr)
 698                 memcpy(&fl.daddr, daddr, sizeof(struct in6_addr));
 699         return (struct rt6_info *)ip6_route_output(&init_net, NULL, &fl);
 700 }
 701
 702 static struct cxgbi_sock *cxgbi_check_route6(struct sockaddr *dst_addr)
 703 {
 704         struct sockaddr_in6 *daddr6 = (struct sockaddr_in6 *)dst_addr;
 705         struct dst_entry *dst;
 706         struct net_device *ndev;
 707         struct cxgbi_device *cdev;
 708         struct rt6_info *rt = NULL;
 709         struct neighbour *n;
 710         struct in6_addr pref_saddr;
 711         struct cxgbi_sock *csk = NULL;
 712         unsigned int mtu = 0;
 713         int port = 0xFFFF;
 714         int err = 0;
 715
 716         rt = find_route_ipv6(NULL, &daddr6->sin6_addr);
 717
 718         if (!rt) {
 719                 pr_info("no route to ipv6 %pI6 port %u\n",
 720                         daddr6->sin6_addr.s6_addr,
 721                         be16_to_cpu(daddr6->sin6_port));
 722                 err = -ENETUNREACH;
 723                 goto err_out;
 724         }
 725
 726         dst = &rt->dst;
 727
 728         n = dst_neigh_lookup(dst, &daddr6->sin6_addr);
 729
 730         if (!n) {
 731                 pr_info("%pI6, port %u, dst no neighbour.\n",
 732                         daddr6->sin6_addr.s6_addr,
 733                         be16_to_cpu(daddr6->sin6_port));
 734                 err = -ENETUNREACH;
 735                 goto rel_rt;
 736         }
 737         ndev = n->dev;
 738
 739         if (ipv6_addr_is_multicast(&daddr6->sin6_addr)) {
 740                 pr_info("multi-cast route %pI6 port %u, dev %s.\n",
 741                         daddr6->sin6_addr.s6_addr,
 742                         ntohs(daddr6->sin6_port), ndev->name);
 743                 err = -ENETUNREACH;
 744                 goto rel_rt;
 745         }
 746
 747         cdev = cxgbi_device_find_by_netdev(ndev, &port);
 748         if (!cdev)
 749                 cdev = cxgbi_device_find_by_mac(ndev, &port);
 750         if (!cdev) {
 751                 pr_info("dst %pI6 %s, NOT cxgbi device.\n",
 752                         daddr6->sin6_addr.s6_addr, ndev->name);
 753                 err = -ENETUNREACH;
 754                 goto rel_rt;
 755         }
 756         log_debug(1 << CXGBI_DBG_SOCK,
 757                   "route to %pI6 :%u, ndev p#%d,%s, cdev 0x%p.\n",
 758                   daddr6->sin6_addr.s6_addr, ntohs(daddr6->sin6_port), port,
 759                   ndev->name, cdev);
 760
 761         csk = cxgbi_sock_create(cdev);
 762         if (!csk) {
 763                 err = -ENOMEM;
 764                 goto rel_rt;
 765         }
 766         csk->cdev = cdev;
 767         csk->port_id = port;
 768         csk->mtu = mtu;
 769         csk->dst = dst;
 770
 771         if (ipv6_addr_any(&rt->rt6i_prefsrc.addr)) {
 772                 struct inet6_dev *idev = ip6_dst_idev((struct dst_entry *)rt);
 773
 774                 err = ipv6_dev_get_saddr(&init_net, idev ? idev->dev : NULL,
 775                                          &daddr6->sin6_addr, 0, &pref_saddr);
 776                 if (err) {
 777                         pr_info("failed to get source address to reach %pI6\n",
 778                                 &daddr6->sin6_addr);
 779                         goto rel_rt;
 780                 }
 781         } else {
 782                 pref_saddr = rt->rt6i_prefsrc.addr;
 783         }
 784
 785         csk->csk_family = AF_INET6;
 786         csk->daddr6.sin6_addr = daddr6->sin6_addr;
 787         csk->daddr6.sin6_port = daddr6->sin6_port;
 788         csk->daddr6.sin6_family = daddr6->sin6_family;
 789         csk->saddr6.sin6_family = daddr6->sin6_family;
 790         csk->saddr6.sin6_addr = pref_saddr;
 791
 792         neigh_release(n);
 793         return csk;
 794
 795 rel_rt:
 796         if (n)
 797                 neigh_release(n);
 798
 799         ip6_rt_put(rt);
 800         if (csk)
 801                 cxgbi_sock_closed(csk);
 802 err_out:
 803         return ERR_PTR(err);
 804 }
 805 #endif /* IS_ENABLED(CONFIG_IPV6) */
 806
 807 void cxgbi_sock_established(struct cxgbi_sock *csk, unsigned int snd_isn,
 808                         unsigned int opt)
 809 {
 810         csk->write_seq = csk->snd_nxt = csk->snd_una = snd_isn;
 811         dst_confirm(csk->dst);
 812         smp_mb();
 813         cxgbi_sock_set_state(csk, CTP_ESTABLISHED);
 814 }
 815 EXPORT_SYMBOL_GPL(cxgbi_sock_established);
 816
 817 static void cxgbi_inform_iscsi_conn_closing(struct cxgbi_sock *csk)
 818 {
 819         log_debug(1 << CXGBI_DBG_SOCK,
 820                 "csk 0x%p, state %u, flags 0x%lx, conn 0x%p.\n",
 821                 csk, csk->state, csk->flags, csk->user_data);
 822
 823         if (csk->state != CTP_ESTABLISHED) {
 824                 read_lock_bh(&csk->callback_lock);
 825                 if (csk->user_data)
 826                         iscsi_conn_failure(csk->user_data,
 827                                         ISCSI_ERR_TCP_CONN_CLOSE);
 828                 read_unlock_bh(&csk->callback_lock);
 829         }
 830 }
 831
 832 void cxgbi_sock_closed(struct cxgbi_sock *csk)
 833 {
 834         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 835                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 836         cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
 837         if (csk->state == CTP_ACTIVE_OPEN || csk->state == CTP_CLOSED)
 838                 return;
 839         if (csk->saddr.sin_port)
 840                 sock_put_port(csk);
 841         if (csk->dst)
 842                 dst_release(csk->dst);
 843         csk->cdev->csk_release_offload_resources(csk);
 844         cxgbi_sock_set_state(csk, CTP_CLOSED);
 845         cxgbi_inform_iscsi_conn_closing(csk);
 846         cxgbi_sock_put(csk);
 847 }
 848 EXPORT_SYMBOL_GPL(cxgbi_sock_closed);
 849
 850 static void need_active_close(struct cxgbi_sock *csk)
 851 {
 852         int data_lost;
 853         int close_req = 0;
 854
 855         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 856                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 857         spin_lock_bh(&csk->lock);
 858         dst_confirm(csk->dst);
 859         data_lost = skb_queue_len(&csk->receive_queue);
 860         __skb_queue_purge(&csk->receive_queue);
 861
 862         if (csk->state == CTP_ACTIVE_OPEN)
 863                 cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
 864         else if (csk->state == CTP_ESTABLISHED) {
 865                 close_req = 1;
 866                 cxgbi_sock_set_state(csk, CTP_ACTIVE_CLOSE);
 867         } else if (csk->state == CTP_PASSIVE_CLOSE) {
 868                 close_req = 1;
 869                 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
 870         }
 871
 872         if (close_req) {
 873                 if (data_lost)
 874                         csk->cdev->csk_send_abort_req(csk);
 875                 else
 876                         csk->cdev->csk_send_close_req(csk);
 877         }
 878
 879         spin_unlock_bh(&csk->lock);
 880 }
 881
 882 void cxgbi_sock_fail_act_open(struct cxgbi_sock *csk, int errno)
 883 {
 884         pr_info("csk 0x%p,%u,%lx, %pI4:%u-%pI4:%u, err %d.\n",
 885                         csk, csk->state, csk->flags,
 886                         &csk->saddr.sin_addr.s_addr, csk->saddr.sin_port,
 887                         &csk->daddr.sin_addr.s_addr, csk->daddr.sin_port,
 888                         errno);
 889
 890         cxgbi_sock_set_state(csk, CTP_CONNECTING);
 891         csk->err = errno;
 892         cxgbi_sock_closed(csk);
 893 }
 894 EXPORT_SYMBOL_GPL(cxgbi_sock_fail_act_open);
 895
 896 void cxgbi_sock_act_open_req_arp_failure(void *handle, struct sk_buff *skb)
 897 {
 898         struct cxgbi_sock *csk = (struct cxgbi_sock *)skb->sk;
 899
 900         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 901                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 902         cxgbi_sock_get(csk);
 903         spin_lock_bh(&csk->lock);
 904         if (csk->state == CTP_ACTIVE_OPEN)
 905                 cxgbi_sock_fail_act_open(csk, -EHOSTUNREACH);
 906         spin_unlock_bh(&csk->lock);
 907         cxgbi_sock_put(csk);
 908         __kfree_skb(skb);
 909 }
 910 EXPORT_SYMBOL_GPL(cxgbi_sock_act_open_req_arp_failure);
 911
 912 void cxgbi_sock_rcv_abort_rpl(struct cxgbi_sock *csk)
 913 {
 914         cxgbi_sock_get(csk);
 915         spin_lock_bh(&csk->lock);
 916
 917         cxgbi_sock_set_flag(csk, CTPF_ABORT_RPL_RCVD);
 918         if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING)) {
 919                 cxgbi_sock_clear_flag(csk, CTPF_ABORT_RPL_PENDING);
 920                 if (cxgbi_sock_flag(csk, CTPF_ABORT_REQ_RCVD))
 921                         pr_err("csk 0x%p,%u,0x%lx,%u,ABT_RPL_RSS.\n",
 922                                csk, csk->state, csk->flags, csk->tid);
 923                 cxgbi_sock_closed(csk);
 924         }
 925
 926         spin_unlock_bh(&csk->lock);
 927         cxgbi_sock_put(csk);
 928 }
 929 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_abort_rpl);
 930
 931 void cxgbi_sock_rcv_peer_close(struct cxgbi_sock *csk)
 932 {
 933         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 934                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 935         cxgbi_sock_get(csk);
 936         spin_lock_bh(&csk->lock);
 937
 938         if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
 939                 goto done;
 940
 941         switch (csk->state) {
 942         case CTP_ESTABLISHED:
 943                 cxgbi_sock_set_state(csk, CTP_PASSIVE_CLOSE);
 944                 break;
 945         case CTP_ACTIVE_CLOSE:
 946                 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
 947                 break;
 948         case CTP_CLOSE_WAIT_1:
 949                 cxgbi_sock_closed(csk);
 950                 break;
 951         case CTP_ABORTING:
 952                 break;
 953         default:
 954                 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
 955                         csk, csk->state, csk->flags, csk->tid);
 956         }
 957         cxgbi_inform_iscsi_conn_closing(csk);
 958 done:
 959         spin_unlock_bh(&csk->lock);
 960         cxgbi_sock_put(csk);
 961 }
 962 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_peer_close);
 963
 964 void cxgbi_sock_rcv_close_conn_rpl(struct cxgbi_sock *csk, u32 snd_nxt)
 965 {
 966         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 967                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 968         cxgbi_sock_get(csk);
 969         spin_lock_bh(&csk->lock);
 970
 971         csk->snd_una = snd_nxt - 1;
 972         if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
 973                 goto done;
 974
 975         switch (csk->state) {
 976         case CTP_ACTIVE_CLOSE:
 977                 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_1);
 978                 break;
 979         case CTP_CLOSE_WAIT_1:
 980         case CTP_CLOSE_WAIT_2:
 981                 cxgbi_sock_closed(csk);
 982                 break;
 983         case CTP_ABORTING:
 984                 break;
 985         default:
 986                 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
 987                         csk, csk->state, csk->flags, csk->tid);
 988         }
 989 done:
 990         spin_unlock_bh(&csk->lock);
 991         cxgbi_sock_put(csk);
 992 }
 993 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_close_conn_rpl);
 994
 995 void cxgbi_sock_rcv_wr_ack(struct cxgbi_sock *csk, unsigned int credits,
 996                            unsigned int snd_una, int seq_chk)
 997 {
 998         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 999                         "csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, snd_una %u,%d.\n",
1000                         csk, csk->state, csk->flags, csk->tid, credits,
1001                         csk->wr_cred, csk->wr_una_cred, snd_una, seq_chk);
1002
1003         spin_lock_bh(&csk->lock);
1004
1005         csk->wr_cred += credits;
1006         if (csk->wr_una_cred > csk->wr_max_cred - csk->wr_cred)
1007                 csk->wr_una_cred = csk->wr_max_cred - csk->wr_cred;
1008
1009         while (credits) {
1010                 struct sk_buff *p = cxgbi_sock_peek_wr(csk);
1011
1012                 if (unlikely(!p)) {
1013                         pr_err("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, empty.\n",
1014                                 csk, csk->state, csk->flags, csk->tid, credits,
1015                                 csk->wr_cred, csk->wr_una_cred);
1016                         break;
1017                 }
1018
1019                 if (unlikely(credits < p->csum)) {
1020                         pr_warn("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, < %u.\n",
1021                                 csk, csk->state, csk->flags, csk->tid,
1022                                 credits, csk->wr_cred, csk->wr_una_cred,
1023                                 p->csum);
1024                         p->csum -= credits;
1025                         break;
1026                 } else {
1027                         cxgbi_sock_dequeue_wr(csk);
1028                         credits -= p->csum;
1029                         kfree_skb(p);
1030                 }
1031         }
1032
1033         cxgbi_sock_check_wr_invariants(csk);
1034
1035         if (seq_chk) {
1036                 if (unlikely(before(snd_una, csk->snd_una))) {
1037                         pr_warn("csk 0x%p,%u,0x%lx,%u, snd_una %u/%u.",
1038                                 csk, csk->state, csk->flags, csk->tid, snd_una,
1039                                 csk->snd_una);
1040                         goto done;
1041                 }
1042
1043                 if (csk->snd_una != snd_una) {
1044                         csk->snd_una = snd_una;
1045                         dst_confirm(csk->dst);
1046                 }
1047         }
1048
1049         if (skb_queue_len(&csk->write_queue)) {
1050                 if (csk->cdev->csk_push_tx_frames(csk, 0))
1051                         cxgbi_conn_tx_open(csk);
1052         } else
1053                 cxgbi_conn_tx_open(csk);
1054 done:
1055         spin_unlock_bh(&csk->lock);
1056 }
1057 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_wr_ack);
1058
1059 static unsigned int cxgbi_sock_find_best_mtu(struct cxgbi_sock *csk,
1060                                              unsigned short mtu)
1061 {
1062         int i = 0;
1063
1064         while (i < csk->cdev->nmtus - 1 && csk->cdev->mtus[i + 1] <= mtu)
1065                 ++i;
1066
1067         return i;
1068 }
1069
1070 unsigned int cxgbi_sock_select_mss(struct cxgbi_sock *csk, unsigned int pmtu)
1071 {
1072         unsigned int idx;
1073         struct dst_entry *dst = csk->dst;
1074
1075         csk->advmss = dst_metric_advmss(dst);
1076
1077         if (csk->advmss > pmtu - 40)
1078                 csk->advmss = pmtu - 40;
1079         if (csk->advmss < csk->cdev->mtus[0] - 40)
1080                 csk->advmss = csk->cdev->mtus[0] - 40;
1081         idx = cxgbi_sock_find_best_mtu(csk, csk->advmss + 40);
1082
1083         return idx;
1084 }
1085 EXPORT_SYMBOL_GPL(cxgbi_sock_select_mss);
1086
1087 void cxgbi_sock_skb_entail(struct cxgbi_sock *csk, struct sk_buff *skb)
1088 {
1089         cxgbi_skcb_tcp_seq(skb) = csk->write_seq;
1090         __skb_queue_tail(&csk->write_queue, skb);
1091 }
1092 EXPORT_SYMBOL_GPL(cxgbi_sock_skb_entail);
1093
1094 void cxgbi_sock_purge_wr_queue(struct cxgbi_sock *csk)
1095 {
1096         struct sk_buff *skb;
1097
1098         while ((skb = cxgbi_sock_dequeue_wr(csk)) != NULL)
1099                 kfree_skb(skb);
1100 }
1101 EXPORT_SYMBOL_GPL(cxgbi_sock_purge_wr_queue);
1102
1103 void cxgbi_sock_check_wr_invariants(const struct cxgbi_sock *csk)
1104 {
1105         int pending = cxgbi_sock_count_pending_wrs(csk);
1106
1107         if (unlikely(csk->wr_cred + pending != csk->wr_max_cred))
1108                 pr_err("csk 0x%p, tid %u, credit %u + %u != %u.\n",
1109                         csk, csk->tid, csk->wr_cred, pending, csk->wr_max_cred);
1110 }
1111 EXPORT_SYMBOL_GPL(cxgbi_sock_check_wr_invariants);
1112
1113 static int cxgbi_sock_send_pdus(struct cxgbi_sock *csk, struct sk_buff *skb)
1114 {
1115         struct cxgbi_device *cdev = csk->cdev;
1116         struct sk_buff *next;
1117         int err, copied = 0;
1118
1119         spin_lock_bh(&csk->lock);
1120
1121         if (csk->state != CTP_ESTABLISHED) {
1122                 log_debug(1 << CXGBI_DBG_PDU_TX,
1123                         "csk 0x%p,%u,0x%lx,%u, EAGAIN.\n",
1124                         csk, csk->state, csk->flags, csk->tid);
1125                 err = -EAGAIN;
1126                 goto out_err;
1127         }
1128
1129         if (csk->err) {
1130                 log_debug(1 << CXGBI_DBG_PDU_TX,
1131                         "csk 0x%p,%u,0x%lx,%u, EPIPE %d.\n",
1132                         csk, csk->state, csk->flags, csk->tid, csk->err);
1133                 err = -EPIPE;
1134                 goto out_err;
1135         }
1136
1137         if (csk->write_seq - csk->snd_una >= csk->snd_win) {
1138                 log_debug(1 << CXGBI_DBG_PDU_TX,
1139                         "csk 0x%p,%u,0x%lx,%u, FULL %u-%u >= %u.\n",
1140                         csk, csk->state, csk->flags, csk->tid, csk->write_seq,
1141                         csk->snd_una, csk->snd_win);
1142                 err = -ENOBUFS;
1143                 goto out_err;
1144         }
1145
1146         while (skb) {
1147                 int frags = skb_shinfo(skb)->nr_frags +
1148                                 (skb->len != skb->data_len);
1149
1150                 if (unlikely(skb_headroom(skb) < cdev->skb_tx_rsvd)) {
1151                         pr_err("csk 0x%p, skb head %u < %u.\n",
1152                                 csk, skb_headroom(skb), cdev->skb_tx_rsvd);
1153                         err = -EINVAL;
1154                         goto out_err;
1155                 }
1156
1157                 if (frags >= SKB_WR_LIST_SIZE) {
1158                         pr_err("csk 0x%p, frags %d, %u,%u >%u.\n",
1159                                 csk, skb_shinfo(skb)->nr_frags, skb->len,
1160                                 skb->data_len, (uint)(SKB_WR_LIST_SIZE));
1161                         err = -EINVAL;
1162                         goto out_err;
1163                 }
1164
1165                 next = skb->next;
1166                 skb->next = NULL;
1167                 cxgbi_skcb_set_flag(skb, SKCBF_TX_NEED_HDR);
1168                 cxgbi_sock_skb_entail(csk, skb);
1169                 copied += skb->len;
1170                 csk->write_seq += skb->len +
1171                                 cxgbi_ulp_extra_len(cxgbi_skcb_ulp_mode(skb));
1172                 skb = next;
1173         }
1174 done:
1175         if (likely(skb_queue_len(&csk->write_queue)))
1176                 cdev->csk_push_tx_frames(csk, 1);
1177         spin_unlock_bh(&csk->lock);
1178         return copied;
1179
1180 out_err:
1181         if (copied == 0 && err == -EPIPE)
1182                 copied = csk->err ? csk->err : -EPIPE;
1183         else
1184                 copied = err;
1185         goto done;
1186 }
1187
1188 static inline void
1189 scmd_get_params(struct scsi_cmnd *sc, struct scatterlist **sgl,
1190                 unsigned int *sgcnt, unsigned int *dlen,
1191                 unsigned int prot)
1192 {
1193         struct scsi_data_buffer *sdb = prot ? scsi_prot(sc) : scsi_out(sc);
1194
1195         *sgl = sdb->table.sgl;
1196         *sgcnt = sdb->table.nents;
1197         *dlen = sdb->length;
1198         /* Caution: for protection sdb, sdb->length is invalid */
1199 }
1200
1201 void cxgbi_ddp_set_one_ppod(struct cxgbi_pagepod *ppod,
1202                             struct cxgbi_task_tag_info *ttinfo,
1203                             struct scatterlist **sg_pp, unsigned int *sg_off)
1204 {
1205         struct scatterlist *sg = sg_pp ? *sg_pp : NULL;
1206         unsigned int offset = sg_off ? *sg_off : 0;
1207         dma_addr_t addr = 0UL;
1208         unsigned int len = 0;
1209         int i;
1210
1211         memcpy(ppod, &ttinfo->hdr, sizeof(struct cxgbi_pagepod_hdr));
1212
1213         if (sg) {
1214                 addr = sg_dma_address(sg);
1215                 len = sg_dma_len(sg);
1216         }
1217
1218         for (i = 0; i < PPOD_PAGES_MAX; i++) {
1219                 if (sg) {
1220                         ppod->addr[i] = cpu_to_be64(addr + offset);
1221                         offset += PAGE_SIZE;
1222                         if (offset == (len + sg->offset)) {
1223                                 offset = 0;
1224                                 sg = sg_next(sg);
1225                                 if (sg) {
1226                                         addr = sg_dma_address(sg);
1227                                         len = sg_dma_len(sg);
1228                                 }
1229                         }
1230                 } else {
1231                         ppod->addr[i] = 0ULL;
1232                 }
1233         }
1234
1235         /*
1236          * the fifth address needs to be repeated in the next ppod, so do
1237          * not move sg
1238          */
1239         if (sg_pp) {
1240                 *sg_pp = sg;
1241                 *sg_off = offset;
1242         }
1243
1244         if (offset == len) {
1245                 offset = 0;
1246                 sg = sg_next(sg);
1247                 if (sg) {
1248                         addr = sg_dma_address(sg);
1249                         len = sg_dma_len(sg);
1250                 }
1251         }
1252         ppod->addr[i] = sg ? cpu_to_be64(addr + offset) : 0ULL;
1253 }
1254 EXPORT_SYMBOL_GPL(cxgbi_ddp_set_one_ppod);
1255
1256 /*
1257  * APIs interacting with open-iscsi libraries
1258  */
1259
1260 static unsigned char padding[4];
1261
1262 void cxgbi_ddp_ppm_setup(void **ppm_pp, struct cxgbi_device *cdev,
1263                          struct cxgbi_tag_format *tformat, unsigned int ppmax,
1264                          unsigned int llimit, unsigned int start,
1265                          unsigned int rsvd_factor)
1266 {
1267         int err = cxgbi_ppm_init(ppm_pp, cdev->ports[0], cdev->pdev,
1268                                 cdev->lldev, tformat, ppmax, llimit, start,
1269                                 rsvd_factor);
1270
1271         if (err >= 0) {
1272                 struct cxgbi_ppm *ppm = (struct cxgbi_ppm *)(*ppm_pp);
1273
1274                 if (ppm->ppmax < 1024 ||
1275                     ppm->tformat.pgsz_idx_dflt >= DDP_PGIDX_MAX)
1276                         cdev->flags |= CXGBI_FLAG_DDP_OFF;
1277                 err = 0;
1278         } else {
1279                 cdev->flags |= CXGBI_FLAG_DDP_OFF;
1280         }
1281 }
1282 EXPORT_SYMBOL_GPL(cxgbi_ddp_ppm_setup);
1283
1284 static int cxgbi_ddp_sgl_check(struct scatterlist *sgl, int nents)
1285 {
1286         int i;
1287         int last_sgidx = nents - 1;
1288         struct scatterlist *sg = sgl;
1289
1290         for (i = 0; i < nents; i++, sg = sg_next(sg)) {
1291                 unsigned int len = sg->length + sg->offset;
1292
1293                 if ((sg->offset & 0x3) || (i && sg->offset) ||
1294                     ((i != last_sgidx) && len != PAGE_SIZE)) {
1295                         log_debug(1 << CXGBI_DBG_DDP,
1296                                   "sg %u/%u, %u,%u, not aligned.\n",
1297                                   i, nents, sg->offset, sg->length);
1298                         goto err_out;
1299                 }
1300         }
1301         return 0;
1302 err_out:
1303         return -EINVAL;
1304 }
1305
1306 static int cxgbi_ddp_reserve(struct cxgbi_conn *cconn,
1307                              struct cxgbi_task_data *tdata, u32 sw_tag,
1308                              unsigned int xferlen)
1309 {
1310         struct cxgbi_sock *csk = cconn->cep->csk;
1311         struct cxgbi_device *cdev = csk->cdev;
1312         struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
1313         struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
1314         struct scatterlist *sgl = ttinfo->sgl;
1315         unsigned int sgcnt = ttinfo->nents;
1316         unsigned int sg_offset = sgl->offset;
1317         int err;
1318
1319         if (cdev->flags & CXGBI_FLAG_DDP_OFF) {
1320                 log_debug(1 << CXGBI_DBG_DDP,
1321                           "cdev 0x%p DDP off.\n", cdev);
1322                 return -EINVAL;
1323         }
1324
1325         if (!ppm || xferlen < DDP_THRESHOLD || !sgcnt ||
1326             ppm->tformat.pgsz_idx_dflt >= DDP_PGIDX_MAX) {
1327                 log_debug(1 << CXGBI_DBG_DDP,
1328                           "ppm 0x%p, pgidx %u, xfer %u, sgcnt %u, NO ddp.\n",
1329                           ppm, ppm ? ppm->tformat.pgsz_idx_dflt : DDP_PGIDX_MAX,
1330                           xferlen, ttinfo->nents);
1331                 return -EINVAL;
1332         }
1333
1334         /* make sure the buffer is suitable for ddp */
1335         if (cxgbi_ddp_sgl_check(sgl, sgcnt) < 0)
1336                 return -EINVAL;
1337
1338         ttinfo->nr_pages = (xferlen + sgl->offset + (1 << PAGE_SHIFT) - 1) >>
1339                             PAGE_SHIFT;
1340
1341         /*
1342          * the ddp tag will be used for the itt in the outgoing pdu,
1343          * the itt genrated by libiscsi is saved in the ppm and can be
1344          * retrieved via the ddp tag
1345          */
1346         err = cxgbi_ppm_ppods_reserve(ppm, ttinfo->nr_pages, 0, &ttinfo->idx,
1347                                       &ttinfo->tag, (unsigned long)sw_tag);
1348         if (err < 0) {
1349                 cconn->ddp_full++;
1350                 return err;
1351         }
1352         ttinfo->npods = err;
1353
1354          /* setup dma from scsi command sgl */
1355         sgl->offset = 0;
1356         err = dma_map_sg(&ppm->pdev->dev, sgl, sgcnt, DMA_FROM_DEVICE);
1357         sgl->offset = sg_offset;
1358         if (err == 0) {
1359                 pr_info("%s: 0x%x, xfer %u, sgl %u dma mapping err.\n",
1360                         __func__, sw_tag, xferlen, sgcnt);
1361                 goto rel_ppods;
1362         }
1363         if (err != ttinfo->nr_pages) {
1364                 log_debug(1 << CXGBI_DBG_DDP,
1365                           "%s: sw tag 0x%x, xfer %u, sgl %u, dma count %d.\n",
1366                           __func__, sw_tag, xferlen, sgcnt, err);
1367         }
1368
1369         ttinfo->flags |= CXGBI_PPOD_INFO_FLAG_MAPPED;
1370         ttinfo->cid = csk->port_id;
1371
1372         cxgbi_ppm_make_ppod_hdr(ppm, ttinfo->tag, csk->tid, sgl->offset,
1373                                 xferlen, &ttinfo->hdr);
1374
1375         if (cdev->flags & CXGBI_FLAG_USE_PPOD_OFLDQ) {
1376                 /* write ppod from xmit_pdu (of iscsi_scsi_command pdu) */
1377                 ttinfo->flags |= CXGBI_PPOD_INFO_FLAG_VALID;
1378         } else {
1379                 /* write ppod from control queue now */
1380                 err = cdev->csk_ddp_set_map(ppm, csk, ttinfo);
1381                 if (err < 0)
1382                         goto rel_ppods;
1383         }
1384
1385         return 0;
1386
1387 rel_ppods:
1388         cxgbi_ppm_ppod_release(ppm, ttinfo->idx);
1389
1390         if (ttinfo->flags & CXGBI_PPOD_INFO_FLAG_MAPPED) {
1391                 ttinfo->flags &= ~CXGBI_PPOD_INFO_FLAG_MAPPED;
1392                 dma_unmap_sg(&ppm->pdev->dev, sgl, sgcnt, DMA_FROM_DEVICE);
1393         }
1394         return -EINVAL;
1395 }
1396
1397 static void task_release_itt(struct iscsi_task *task, itt_t hdr_itt)
1398 {
1399         struct scsi_cmnd *sc = task->sc;
1400         struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
1401         struct cxgbi_conn *cconn = tcp_conn->dd_data;
1402         struct cxgbi_device *cdev = cconn->chba->cdev;
1403         struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
1404         u32 tag = ntohl((__force u32)hdr_itt);
1405
1406         log_debug(1 << CXGBI_DBG_DDP,
1407                   "cdev 0x%p, task 0x%p, release tag 0x%x.\n",
1408                   cdev, task, tag);
1409         if (sc &&
1410             (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE) &&
1411             cxgbi_ppm_is_ddp_tag(ppm, tag)) {
1412                 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1413                 struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
1414
1415                 if (!(cdev->flags & CXGBI_FLAG_USE_PPOD_OFLDQ))
1416                         cdev->csk_ddp_clear_map(cdev, ppm, ttinfo);
1417                 cxgbi_ppm_ppod_release(ppm, ttinfo->idx);
1418                 dma_unmap_sg(&ppm->pdev->dev, ttinfo->sgl, ttinfo->nents,
1419                              DMA_FROM_DEVICE);
1420         }
1421 }
1422
1423 static inline u32 cxgbi_build_sw_tag(u32 idx, u32 age)
1424 {
1425         /* assume idx and age both are < 0x7FFF (32767) */
1426         return (idx << 16) | age;
1427 }
1428
1429 static int task_reserve_itt(struct iscsi_task *task, itt_t *hdr_itt)
1430 {
1431         struct scsi_cmnd *sc = task->sc;
1432         struct iscsi_conn *conn = task->conn;
1433         struct iscsi_session *sess = conn->session;
1434         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1435         struct cxgbi_conn *cconn = tcp_conn->dd_data;
1436         struct cxgbi_device *cdev = cconn->chba->cdev;
1437         struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
1438         u32 sw_tag = cxgbi_build_sw_tag(task->itt, sess->age);
1439         u32 tag = 0;
1440         int err = -EINVAL;
1441
1442         if (sc &&
1443             (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE)
1444         ) {
1445                 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1446                 struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
1447
1448                 scmd_get_params(sc, &ttinfo->sgl, &ttinfo->nents,
1449                                 &tdata->dlen, 0);
1450                 err = cxgbi_ddp_reserve(cconn, tdata, sw_tag, tdata->dlen);
1451                 if (!err)
1452                         tag = ttinfo->tag;
1453                 else
1454                          log_debug(1 << CXGBI_DBG_DDP,
1455                                    "csk 0x%p, R task 0x%p, %u,%u, no ddp.\n",
1456                                    cconn->cep->csk, task, tdata->dlen,
1457                                    ttinfo->nents);
1458         }
1459
1460         if (err < 0) {
1461                 err = cxgbi_ppm_make_non_ddp_tag(ppm, sw_tag, &tag);
1462                 if (err < 0)
1463                         return err;
1464         }
1465         /*  the itt need to sent in big-endian order */
1466         *hdr_itt = (__force itt_t)htonl(tag);
1467
1468         log_debug(1 << CXGBI_DBG_DDP,
1469                   "cdev 0x%p, task 0x%p, 0x%x(0x%x,0x%x)->0x%x/0x%x.\n",
1470                   cdev, task, sw_tag, task->itt, sess->age, tag, *hdr_itt);
1471         return 0;
1472 }
1473
1474 void cxgbi_parse_pdu_itt(struct iscsi_conn *conn, itt_t itt, int *idx, int *age)
1475 {
1476         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1477         struct cxgbi_conn *cconn = tcp_conn->dd_data;
1478         struct cxgbi_device *cdev = cconn->chba->cdev;
1479         struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
1480         u32 tag = ntohl((__force u32)itt);
1481         u32 sw_bits;
1482
1483         if (ppm) {
1484                 if (cxgbi_ppm_is_ddp_tag(ppm, tag))
1485                         sw_bits = cxgbi_ppm_get_tag_caller_data(ppm, tag);
1486                 else
1487                         sw_bits = cxgbi_ppm_decode_non_ddp_tag(ppm, tag);
1488         } else {
1489                 sw_bits = tag;
1490         }
1491
1492         cxgbi_decode_sw_tag(sw_bits, idx, age);
1493         log_debug(1 << CXGBI_DBG_DDP,
1494                   "cdev 0x%p, tag 0x%x/0x%x, -> 0x%x(0x%x,0x%x).\n",
1495                   cdev, tag, itt, sw_bits, idx ? *idx : 0xFFFFF,
1496                   age ? *age : 0xFF);
1497 }
1498 EXPORT_SYMBOL_GPL(cxgbi_parse_pdu_itt);
1499
1500 void cxgbi_conn_tx_open(struct cxgbi_sock *csk)
1501 {
1502         struct iscsi_conn *conn = csk->user_data;
1503
1504         if (conn) {
1505                 log_debug(1 << CXGBI_DBG_SOCK,
1506                         "csk 0x%p, cid %d.\n", csk, conn->id);
1507                 iscsi_conn_queue_work(conn);
1508         }
1509 }
1510 EXPORT_SYMBOL_GPL(cxgbi_conn_tx_open);
1511
1512 /*
1513  * pdu receive, interact with libiscsi_tcp
1514  */
1515 static inline int read_pdu_skb(struct iscsi_conn *conn,
1516                                struct sk_buff *skb,
1517                                unsigned int offset,
1518                                int offloaded)
1519 {
1520         int status = 0;
1521         int bytes_read;
1522
1523         bytes_read = iscsi_tcp_recv_skb(conn, skb, offset, offloaded, &status);
1524         switch (status) {
1525         case ISCSI_TCP_CONN_ERR:
1526                 pr_info("skb 0x%p, off %u, %d, TCP_ERR.\n",
1527                           skb, offset, offloaded);
1528                 return -EIO;
1529         case ISCSI_TCP_SUSPENDED:
1530                 log_debug(1 << CXGBI_DBG_PDU_RX,
1531                         "skb 0x%p, off %u, %d, TCP_SUSPEND, rc %d.\n",
1532                         skb, offset, offloaded, bytes_read);
1533                 /* no transfer - just have caller flush queue */
1534                 return bytes_read;
1535         case ISCSI_TCP_SKB_DONE:
1536                 pr_info("skb 0x%p, off %u, %d, TCP_SKB_DONE.\n",
1537                         skb, offset, offloaded);
1538                 /*
1539                  * pdus should always fit in the skb and we should get
1540                  * segment done notifcation.
1541                  */
1542                 iscsi_conn_printk(KERN_ERR, conn, "Invalid pdu or skb.");
1543                 return -EFAULT;
1544         case ISCSI_TCP_SEGMENT_DONE:
1545                 log_debug(1 << CXGBI_DBG_PDU_RX,
1546                         "skb 0x%p, off %u, %d, TCP_SEG_DONE, rc %d.\n",
1547                         skb, offset, offloaded, bytes_read);
1548                 return bytes_read;
1549         default:
1550                 pr_info("skb 0x%p, off %u, %d, invalid status %d.\n",
1551                         skb, offset, offloaded, status);
1552                 return -EINVAL;
1553         }
1554 }
1555
1556 static int skb_read_pdu_bhs(struct iscsi_conn *conn, struct sk_buff *skb)
1557 {
1558         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1559
1560         log_debug(1 << CXGBI_DBG_PDU_RX,
1561                 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1562                 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1563
1564         if (!iscsi_tcp_recv_segment_is_hdr(tcp_conn)) {
1565                 pr_info("conn 0x%p, skb 0x%p, not hdr.\n", conn, skb);
1566                 iscsi_conn_failure(conn, ISCSI_ERR_PROTO);
1567                 return -EIO;
1568         }
1569
1570         if (conn->hdrdgst_en &&
1571             cxgbi_skcb_test_flag(skb, SKCBF_RX_HCRC_ERR)) {
1572                 pr_info("conn 0x%p, skb 0x%p, hcrc.\n", conn, skb);
1573                 iscsi_conn_failure(conn, ISCSI_ERR_HDR_DGST);
1574                 return -EIO;
1575         }
1576
1577         return read_pdu_skb(conn, skb, 0, 0);
1578 }
1579
1580 static int skb_read_pdu_data(struct iscsi_conn *conn, struct sk_buff *lskb,
1581                              struct sk_buff *skb, unsigned int offset)
1582 {
1583         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1584         bool offloaded = 0;
1585         int opcode = tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK;
1586
1587         log_debug(1 << CXGBI_DBG_PDU_RX,
1588                 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1589                 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1590
1591         if (conn->datadgst_en &&
1592             cxgbi_skcb_test_flag(lskb, SKCBF_RX_DCRC_ERR)) {
1593                 pr_info("conn 0x%p, skb 0x%p, dcrc 0x%lx.\n",
1594                         conn, lskb, cxgbi_skcb_flags(lskb));
1595                 iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST);
1596                 return -EIO;
1597         }
1598
1599         if (iscsi_tcp_recv_segment_is_hdr(tcp_conn))
1600                 return 0;
1601
1602         /* coalesced, add header digest length */
1603         if (lskb == skb && conn->hdrdgst_en)
1604                 offset += ISCSI_DIGEST_SIZE;
1605
1606         if (cxgbi_skcb_test_flag(lskb, SKCBF_RX_DATA_DDPD))
1607                 offloaded = 1;
1608
1609         if (opcode == ISCSI_OP_SCSI_DATA_IN)
1610                 log_debug(1 << CXGBI_DBG_PDU_RX,
1611                         "skb 0x%p, op 0x%x, itt 0x%x, %u %s ddp'ed.\n",
1612                         skb, opcode, ntohl(tcp_conn->in.hdr->itt),
1613                         tcp_conn->in.datalen, offloaded ? "is" : "not");
1614
1615         return read_pdu_skb(conn, skb, offset, offloaded);
1616 }
1617
1618 static void csk_return_rx_credits(struct cxgbi_sock *csk, int copied)
1619 {
1620         struct cxgbi_device *cdev = csk->cdev;
1621         int must_send;
1622         u32 credits;
1623
1624         log_debug(1 << CXGBI_DBG_PDU_RX,
1625                 "csk 0x%p,%u,0x%lx,%u, seq %u, wup %u, thre %u, %u.\n",
1626                 csk, csk->state, csk->flags, csk->tid, csk->copied_seq,
1627                 csk->rcv_wup, cdev->rx_credit_thres,
1628                 csk->rcv_win);
1629
1630         if (csk->state != CTP_ESTABLISHED)
1631                 return;
1632
1633         credits = csk->copied_seq - csk->rcv_wup;
1634         if (unlikely(!credits))
1635                 return;
1636         if (unlikely(cdev->rx_credit_thres == 0))
1637                 return;
1638
1639         must_send = credits + 16384 >= csk->rcv_win;
1640         if (must_send || credits >= cdev->rx_credit_thres)
1641                 csk->rcv_wup += cdev->csk_send_rx_credits(csk, credits);
1642 }
1643
1644 void cxgbi_conn_pdu_ready(struct cxgbi_sock *csk)
1645 {
1646         struct cxgbi_device *cdev = csk->cdev;
1647         struct iscsi_conn *conn = csk->user_data;
1648         struct sk_buff *skb;
1649         unsigned int read = 0;
1650         int err = 0;
1651
1652         log_debug(1 << CXGBI_DBG_PDU_RX,
1653                 "csk 0x%p, conn 0x%p.\n", csk, conn);
1654
1655         if (unlikely(!conn || conn->suspend_rx)) {
1656                 log_debug(1 << CXGBI_DBG_PDU_RX,
1657                         "csk 0x%p, conn 0x%p, id %d, suspend_rx %lu!\n",
1658                         csk, conn, conn ? conn->id : 0xFF,
1659                         conn ? conn->suspend_rx : 0xFF);
1660                 return;
1661         }
1662
1663         while (!err) {
1664                 skb = skb_peek(&csk->receive_queue);
1665                 if (!skb ||
1666                     !(cxgbi_skcb_test_flag(skb, SKCBF_RX_STATUS))) {
1667                         if (skb)
1668                                 log_debug(1 << CXGBI_DBG_PDU_RX,
1669                                         "skb 0x%p, NOT ready 0x%lx.\n",
1670                                         skb, cxgbi_skcb_flags(skb));
1671                         break;
1672                 }
1673                 __skb_unlink(skb, &csk->receive_queue);
1674
1675                 read += cxgbi_skcb_rx_pdulen(skb);
1676                 log_debug(1 << CXGBI_DBG_PDU_RX,
1677                         "csk 0x%p, skb 0x%p,%u,f 0x%lx, pdu len %u.\n",
1678                         csk, skb, skb->len, cxgbi_skcb_flags(skb),
1679                         cxgbi_skcb_rx_pdulen(skb));
1680
1681                 if (cxgbi_skcb_test_flag(skb, SKCBF_RX_COALESCED)) {
1682                         err = skb_read_pdu_bhs(conn, skb);
1683                         if (err < 0) {
1684                                 pr_err("coalesced bhs, csk 0x%p, skb 0x%p,%u, "
1685                                         "f 0x%lx, plen %u.\n",
1686                                         csk, skb, skb->len,
1687                                         cxgbi_skcb_flags(skb),
1688                                         cxgbi_skcb_rx_pdulen(skb));
1689                                 goto skb_done;
1690                         }
1691                         err = skb_read_pdu_data(conn, skb, skb,
1692                                                 err + cdev->skb_rx_extra);
1693                         if (err < 0)
1694                                 pr_err("coalesced data, csk 0x%p, skb 0x%p,%u, "
1695                                         "f 0x%lx, plen %u.\n",
1696                                         csk, skb, skb->len,
1697                                         cxgbi_skcb_flags(skb),
1698                                         cxgbi_skcb_rx_pdulen(skb));
1699                 } else {
1700                         err = skb_read_pdu_bhs(conn, skb);
1701                         if (err < 0) {
1702                                 pr_err("bhs, csk 0x%p, skb 0x%p,%u, "
1703                                         "f 0x%lx, plen %u.\n",
1704                                         csk, skb, skb->len,
1705                                         cxgbi_skcb_flags(skb),
1706                                         cxgbi_skcb_rx_pdulen(skb));
1707                                 goto skb_done;
1708                         }
1709
1710                         if (cxgbi_skcb_test_flag(skb, SKCBF_RX_DATA)) {
1711                                 struct sk_buff *dskb;
1712
1713                                 dskb = skb_peek(&csk->receive_queue);
1714                                 if (!dskb) {
1715                                         pr_err("csk 0x%p, skb 0x%p,%u, f 0x%lx,"
1716                                                 " plen %u, NO data.\n",
1717                                                 csk, skb, skb->len,
1718                                                 cxgbi_skcb_flags(skb),
1719                                                 cxgbi_skcb_rx_pdulen(skb));
1720                                         err = -EIO;
1721                                         goto skb_done;
1722                                 }
1723                                 __skb_unlink(dskb, &csk->receive_queue);
1724
1725                                 err = skb_read_pdu_data(conn, skb, dskb, 0);
1726                                 if (err < 0)
1727                                         pr_err("data, csk 0x%p, skb 0x%p,%u, "
1728                                                 "f 0x%lx, plen %u, dskb 0x%p,"
1729                                                 "%u.\n",
1730                                                 csk, skb, skb->len,
1731                                                 cxgbi_skcb_flags(skb),
1732                                                 cxgbi_skcb_rx_pdulen(skb),
1733                                                 dskb, dskb->len);
1734                                 __kfree_skb(dskb);
1735                         } else
1736                                 err = skb_read_pdu_data(conn, skb, skb, 0);
1737                 }
1738 skb_done:
1739                 __kfree_skb(skb);
1740
1741                 if (err < 0)
1742                         break;
1743         }
1744
1745         log_debug(1 << CXGBI_DBG_PDU_RX, "csk 0x%p, read %u.\n", csk, read);
1746         if (read) {
1747                 csk->copied_seq += read;
1748                 csk_return_rx_credits(csk, read);
1749                 conn->rxdata_octets += read;
1750         }
1751
1752         if (err < 0) {
1753                 pr_info("csk 0x%p, 0x%p, rx failed %d, read %u.\n",
1754                         csk, conn, err, read);
1755                 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1756         }
1757 }
1758 EXPORT_SYMBOL_GPL(cxgbi_conn_pdu_ready);
1759
1760 static int sgl_seek_offset(struct scatterlist *sgl, unsigned int sgcnt,
1761                                 unsigned int offset, unsigned int *off,
1762                                 struct scatterlist **sgp)
1763 {
1764         int i;
1765         struct scatterlist *sg;
1766
1767         for_each_sg(sgl, sg, sgcnt, i) {
1768                 if (offset < sg->length) {
1769                         *off = offset;
1770                         *sgp = sg;
1771                         return 0;
1772                 }
1773                 offset -= sg->length;
1774         }
1775         return -EFAULT;
1776 }
1777
1778 static int sgl_read_to_frags(struct scatterlist *sg, unsigned int sgoffset,
1779                                 unsigned int dlen, struct page_frag *frags,
1780                                 int frag_max)
1781 {
1782         unsigned int datalen = dlen;
1783         unsigned int sglen = sg->length - sgoffset;
1784         struct page *page = sg_page(sg);
1785         int i;
1786
1787         i = 0;
1788         do {
1789                 unsigned int copy;
1790
1791                 if (!sglen) {
1792                         sg = sg_next(sg);
1793                         if (!sg) {
1794                                 pr_warn("sg %d NULL, len %u/%u.\n",
1795                                         i, datalen, dlen);
1796                                 return -EINVAL;
1797                         }
1798                         sgoffset = 0;
1799                         sglen = sg->length;
1800                         page = sg_page(sg);
1801
1802                 }
1803                 copy = min(datalen, sglen);
1804                 if (i && page == frags[i - 1].page &&
1805                     sgoffset + sg->offset ==
1806                         frags[i - 1].offset + frags[i - 1].size) {
1807                         frags[i - 1].size += copy;
1808                 } else {
1809                         if (i >= frag_max) {
1810                                 pr_warn("too many pages %u, dlen %u.\n",
1811                                         frag_max, dlen);
1812                                 return -EINVAL;
1813                         }
1814
1815                         frags[i].page = page;
1816                         frags[i].offset = sg->offset + sgoffset;
1817                         frags[i].size = copy;
1818                         i++;
1819                 }
1820                 datalen -= copy;
1821                 sgoffset += copy;
1822                 sglen -= copy;
1823         } while (datalen);
1824
1825         return i;
1826 }
1827
1828 int cxgbi_conn_alloc_pdu(struct iscsi_task *task, u8 opcode)
1829 {
1830         struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
1831         struct cxgbi_conn *cconn = tcp_conn->dd_data;
1832         struct cxgbi_device *cdev = cconn->chba->cdev;
1833         struct iscsi_conn *conn = task->conn;
1834         struct iscsi_tcp_task *tcp_task = task->dd_data;
1835         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1836         struct scsi_cmnd *sc = task->sc;
1837         int headroom = SKB_TX_ISCSI_PDU_HEADER_MAX;
1838
1839         tcp_task->dd_data = tdata;
1840         task->hdr = NULL;
1841
1842         if (SKB_MAX_HEAD(cdev->skb_tx_rsvd) > (512 * MAX_SKB_FRAGS) &&
1843             (opcode == ISCSI_OP_SCSI_DATA_OUT ||
1844              (opcode == ISCSI_OP_SCSI_CMD &&
1845               (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_TO_DEVICE))))
1846                 /* data could goes into skb head */
1847                 headroom += min_t(unsigned int,
1848                                 SKB_MAX_HEAD(cdev->skb_tx_rsvd),
1849                                 conn->max_xmit_dlength);
1850
1851         tdata->skb = alloc_skb(cdev->skb_tx_rsvd + headroom, GFP_ATOMIC);
1852         if (!tdata->skb) {
1853                 struct cxgbi_sock *csk = cconn->cep->csk;
1854                 struct net_device *ndev = cdev->ports[csk->port_id];
1855                 ndev->stats.tx_dropped++;
1856                 return -ENOMEM;
1857         }
1858
1859         skb_reserve(tdata->skb, cdev->skb_tx_rsvd);
1860         task->hdr = (struct iscsi_hdr *)tdata->skb->data;
1861         task->hdr_max = SKB_TX_ISCSI_PDU_HEADER_MAX; /* BHS + AHS */
1862
1863         /* data_out uses scsi_cmd's itt */
1864         if (opcode != ISCSI_OP_SCSI_DATA_OUT)
1865                 task_reserve_itt(task, &task->hdr->itt);
1866
1867         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
1868                 "task 0x%p, op 0x%x, skb 0x%p,%u+%u/%u, itt 0x%x.\n",
1869                 task, opcode, tdata->skb, cdev->skb_tx_rsvd, headroom,
1870                 conn->max_xmit_dlength, ntohl(task->hdr->itt));
1871
1872         return 0;
1873 }
1874 EXPORT_SYMBOL_GPL(cxgbi_conn_alloc_pdu);
1875
1876 static inline void tx_skb_setmode(struct sk_buff *skb, int hcrc, int dcrc)
1877 {
1878         if (hcrc || dcrc) {
1879                 u8 submode = 0;
1880
1881                 if (hcrc)
1882                         submode |= 1;
1883                 if (dcrc)
1884                         submode |= 2;
1885                 cxgbi_skcb_ulp_mode(skb) = (ULP2_MODE_ISCSI << 4) | submode;
1886         } else
1887                 cxgbi_skcb_ulp_mode(skb) = 0;
1888 }
1889
1890 int cxgbi_conn_init_pdu(struct iscsi_task *task, unsigned int offset,
1891                               unsigned int count)
1892 {
1893         struct iscsi_conn *conn = task->conn;
1894         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1895         struct sk_buff *skb = tdata->skb;
1896         unsigned int datalen = count;
1897         int i, padlen = iscsi_padding(count);
1898         struct page *pg;
1899
1900         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
1901                 "task 0x%p,0x%p, skb 0x%p, 0x%x,0x%x,0x%x, %u+%u.\n",
1902                 task, task->sc, skb, (*skb->data) & ISCSI_OPCODE_MASK,
1903                 ntohl(task->cmdsn), ntohl(task->hdr->itt), offset, count);
1904
1905         skb_put(skb, task->hdr_len);
1906         tx_skb_setmode(skb, conn->hdrdgst_en, datalen ? conn->datadgst_en : 0);
1907         if (!count)
1908                 return 0;
1909
1910         if (task->sc) {
1911                 struct scsi_data_buffer *sdb = scsi_out(task->sc);
1912                 struct scatterlist *sg = NULL;
1913                 int err;
1914
1915                 tdata->offset = offset;
1916                 tdata->count = count;
1917                 err = sgl_seek_offset(
1918                                         sdb->table.sgl, sdb->table.nents,
1919                                         tdata->offset, &tdata->sgoffset, &sg);
1920                 if (err < 0) {
1921                         pr_warn("tpdu, sgl %u, bad offset %u/%u.\n",
1922                                 sdb->table.nents, tdata->offset, sdb->length);
1923                         return err;
1924                 }
1925                 err = sgl_read_to_frags(sg, tdata->sgoffset, tdata->count,
1926                                         tdata->frags, MAX_PDU_FRAGS);
1927                 if (err < 0) {
1928                         pr_warn("tpdu, sgl %u, bad offset %u + %u.\n",
1929                                 sdb->table.nents, tdata->offset, tdata->count);
1930                         return err;
1931                 }
1932                 tdata->nr_frags = err;
1933
1934                 if (tdata->nr_frags > MAX_SKB_FRAGS ||
1935                     (padlen && tdata->nr_frags == MAX_SKB_FRAGS)) {
1936                         char *dst = skb->data + task->hdr_len;
1937                         struct page_frag *frag = tdata->frags;
1938
1939                         /* data fits in the skb's headroom */
1940                         for (i = 0; i < tdata->nr_frags; i++, frag++) {
1941                                 char *src = kmap_atomic(frag->page);
1942
1943                                 memcpy(dst, src+frag->offset, frag->size);
1944                                 dst += frag->size;
1945                                 kunmap_atomic(src);
1946                         }
1947                         if (padlen) {
1948                                 memset(dst, 0, padlen);
1949                                 padlen = 0;
1950                         }
1951                         skb_put(skb, count + padlen);
1952                 } else {
1953                         /* data fit into frag_list */
1954                         for (i = 0; i < tdata->nr_frags; i++) {
1955                                 __skb_fill_page_desc(skb, i,
1956                                                 tdata->frags[i].page,
1957                                                 tdata->frags[i].offset,
1958                                                 tdata->frags[i].size);
1959                                 skb_frag_ref(skb, i);
1960                         }
1961                         skb_shinfo(skb)->nr_frags = tdata->nr_frags;
1962                         skb->len += count;
1963                         skb->data_len += count;
1964                         skb->truesize += count;
1965                 }
1966
1967         } else {
1968                 pg = virt_to_page(task->data);
1969
1970                 get_page(pg);
1971                 skb_fill_page_desc(skb, 0, pg, offset_in_page(task->data),
1972                                         count);
1973                 skb->len += count;
1974                 skb->data_len += count;
1975                 skb->truesize += count;
1976         }
1977
1978         if (padlen) {
1979                 i = skb_shinfo(skb)->nr_frags;
1980                 skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags,
1981                                 virt_to_page(padding), offset_in_page(padding),
1982                                 padlen);
1983
1984                 skb->data_len += padlen;
1985                 skb->truesize += padlen;
1986                 skb->len += padlen;
1987         }
1988
1989         return 0;
1990 }
1991 EXPORT_SYMBOL_GPL(cxgbi_conn_init_pdu);
1992
1993 int cxgbi_conn_xmit_pdu(struct iscsi_task *task)
1994 {
1995         struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
1996         struct cxgbi_conn *cconn = tcp_conn->dd_data;
1997         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1998         struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
1999         struct sk_buff *skb = tdata->skb;
2000         struct cxgbi_sock *csk = NULL;
2001         unsigned int datalen;
2002         int err;
2003
2004         if (!skb) {
2005                 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2006                         "task 0x%p, skb NULL.\n", task);
2007                 return 0;
2008         }
2009
2010         if (cconn && cconn->cep)
2011                 csk = cconn->cep->csk;
2012         if (!csk) {
2013                 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2014                           "task 0x%p, csk gone.\n", task);
2015                 return -EPIPE;
2016         }
2017
2018         datalen = skb->data_len;
2019         tdata->skb = NULL;
2020
2021         /* write ppod first if using ofldq to write ppod */
2022         if (ttinfo->flags & CXGBI_PPOD_INFO_FLAG_VALID) {
2023                 struct cxgbi_ppm *ppm = csk->cdev->cdev2ppm(csk->cdev);
2024
2025                 ttinfo->flags &= ~CXGBI_PPOD_INFO_FLAG_VALID;
2026                 if (csk->cdev->csk_ddp_set_map(ppm, csk, ttinfo) < 0)
2027                         pr_err("task 0x%p, ppod writing using ofldq failed.\n",
2028                                task);
2029                         /* continue. Let fl get the data */
2030         }
2031
2032         err = cxgbi_sock_send_pdus(cconn->cep->csk, skb);
2033         if (err > 0) {
2034                 int pdulen = err;
2035
2036                 log_debug(1 << CXGBI_DBG_PDU_TX,
2037                         "task 0x%p,0x%p, skb 0x%p, len %u/%u, rv %d.\n",
2038                         task, task->sc, skb, skb->len, skb->data_len, err);
2039
2040                 if (task->conn->hdrdgst_en)
2041                         pdulen += ISCSI_DIGEST_SIZE;
2042
2043                 if (datalen && task->conn->datadgst_en)
2044                         pdulen += ISCSI_DIGEST_SIZE;
2045
2046                 task->conn->txdata_octets += pdulen;
2047                 return 0;
2048         }
2049
2050         if (err == -EAGAIN || err == -ENOBUFS) {
2051                 log_debug(1 << CXGBI_DBG_PDU_TX,
2052                         "task 0x%p, skb 0x%p, len %u/%u, %d EAGAIN.\n",
2053                         task, skb, skb->len, skb->data_len, err);
2054                 /* reset skb to send when we are called again */
2055                 tdata->skb = skb;
2056                 return err;
2057         }
2058
2059         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2060                 "itt 0x%x, skb 0x%p, len %u/%u, xmit err %d.\n",
2061                 task->itt, skb, skb->len, skb->data_len, err);
2062
2063         kfree_skb(skb);
2064
2065         iscsi_conn_printk(KERN_ERR, task->conn, "xmit err %d.\n", err);
2066         iscsi_conn_failure(task->conn, ISCSI_ERR_XMIT_FAILED);
2067         return err;
2068 }
2069 EXPORT_SYMBOL_GPL(cxgbi_conn_xmit_pdu);
2070
2071 void cxgbi_cleanup_task(struct iscsi_task *task)
2072 {
2073         struct iscsi_tcp_task *tcp_task = task->dd_data;
2074         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2075
2076         log_debug(1 << CXGBI_DBG_ISCSI,
2077                 "task 0x%p, skb 0x%p, itt 0x%x.\n",
2078                 task, tdata->skb, task->hdr_itt);
2079
2080         tcp_task->dd_data = NULL;
2081         /*  never reached the xmit task callout */
2082         if (tdata->skb)
2083                 __kfree_skb(tdata->skb);
2084         memset(tdata, 0, sizeof(*tdata));
2085
2086         task_release_itt(task, task->hdr_itt);
2087         iscsi_tcp_cleanup_task(task);
2088 }
2089 EXPORT_SYMBOL_GPL(cxgbi_cleanup_task);
2090
2091 void cxgbi_get_conn_stats(struct iscsi_cls_conn *cls_conn,
2092                                 struct iscsi_stats *stats)
2093 {
2094         struct iscsi_conn *conn = cls_conn->dd_data;
2095
2096         stats->txdata_octets = conn->txdata_octets;
2097         stats->rxdata_octets = conn->rxdata_octets;
2098         stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
2099         stats->dataout_pdus = conn->dataout_pdus_cnt;
2100         stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
2101         stats->datain_pdus = conn->datain_pdus_cnt;
2102         stats->r2t_pdus = conn->r2t_pdus_cnt;
2103         stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
2104         stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
2105         stats->digest_err = 0;
2106         stats->timeout_err = 0;
2107         stats->custom_length = 1;
2108         strcpy(stats->custom[0].desc, "eh_abort_cnt");
2109         stats->custom[0].value = conn->eh_abort_cnt;
2110 }
2111 EXPORT_SYMBOL_GPL(cxgbi_get_conn_stats);
2112
2113 static int cxgbi_conn_max_xmit_dlength(struct iscsi_conn *conn)
2114 {
2115         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2116         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2117         struct cxgbi_device *cdev = cconn->chba->cdev;
2118         unsigned int headroom = SKB_MAX_HEAD(cdev->skb_tx_rsvd);
2119         unsigned int max_def = 512 * MAX_SKB_FRAGS;
2120         unsigned int max = max(max_def, headroom);
2121
2122         max = min(cconn->chba->cdev->tx_max_size, max);
2123         if (conn->max_xmit_dlength)
2124                 conn->max_xmit_dlength = min(conn->max_xmit_dlength, max);
2125         else
2126                 conn->max_xmit_dlength = max;
2127         cxgbi_align_pdu_size(conn->max_xmit_dlength);
2128
2129         return 0;
2130 }
2131
2132 static int cxgbi_conn_max_recv_dlength(struct iscsi_conn *conn)
2133 {
2134         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2135         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2136         unsigned int max = cconn->chba->cdev->rx_max_size;
2137
2138         cxgbi_align_pdu_size(max);
2139
2140         if (conn->max_recv_dlength) {
2141                 if (conn->max_recv_dlength > max) {
2142                         pr_err("MaxRecvDataSegmentLength %u > %u.\n",
2143                                 conn->max_recv_dlength, max);
2144                         return -EINVAL;
2145                 }
2146                 conn->max_recv_dlength = min(conn->max_recv_dlength, max);
2147                 cxgbi_align_pdu_size(conn->max_recv_dlength);
2148         } else
2149                 conn->max_recv_dlength = max;
2150
2151         return 0;
2152 }
2153
2154 int cxgbi_set_conn_param(struct iscsi_cls_conn *cls_conn,
2155                         enum iscsi_param param, char *buf, int buflen)
2156 {
2157         struct iscsi_conn *conn = cls_conn->dd_data;
2158         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2159         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2160         struct cxgbi_sock *csk = cconn->cep->csk;
2161         int err;
2162
2163         log_debug(1 << CXGBI_DBG_ISCSI,
2164                 "cls_conn 0x%p, param %d, buf(%d) %s.\n",
2165                 cls_conn, param, buflen, buf);
2166
2167         switch (param) {
2168         case ISCSI_PARAM_HDRDGST_EN:
2169                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2170                 if (!err && conn->hdrdgst_en)
2171                         err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2172                                                         conn->hdrdgst_en,
2173                                                         conn->datadgst_en, 0);
2174                 break;
2175         case ISCSI_PARAM_DATADGST_EN:
2176                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2177                 if (!err && conn->datadgst_en)
2178                         err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2179                                                         conn->hdrdgst_en,
2180                                                         conn->datadgst_en, 0);
2181                 break;
2182         case ISCSI_PARAM_MAX_R2T:
2183                 return iscsi_tcp_set_max_r2t(conn, buf);
2184         case ISCSI_PARAM_MAX_RECV_DLENGTH:
2185                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2186                 if (!err)
2187                         err = cxgbi_conn_max_recv_dlength(conn);
2188                 break;
2189         case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2190                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2191                 if (!err)
2192                         err = cxgbi_conn_max_xmit_dlength(conn);
2193                 break;
2194         default:
2195                 return iscsi_set_param(cls_conn, param, buf, buflen);
2196         }
2197         return err;
2198 }
2199 EXPORT_SYMBOL_GPL(cxgbi_set_conn_param);
2200
2201 static inline int csk_print_port(struct cxgbi_sock *csk, char *buf)
2202 {
2203         int len;
2204
2205         cxgbi_sock_get(csk);
2206         len = sprintf(buf, "%hu\n", ntohs(csk->daddr.sin_port));
2207         cxgbi_sock_put(csk);
2208
2209         return len;
2210 }
2211
2212 static inline int csk_print_ip(struct cxgbi_sock *csk, char *buf)
2213 {
2214         int len;
2215
2216         cxgbi_sock_get(csk);
2217         if (csk->csk_family == AF_INET)
2218                 len = sprintf(buf, "%pI4",
2219                               &csk->daddr.sin_addr.s_addr);
2220         else
2221                 len = sprintf(buf, "%pI6",
2222                               &csk->daddr6.sin6_addr);
2223
2224         cxgbi_sock_put(csk);
2225
2226         return len;
2227 }
2228
2229 int cxgbi_get_ep_param(struct iscsi_endpoint *ep, enum iscsi_param param,
2230                        char *buf)
2231 {
2232         struct cxgbi_endpoint *cep = ep->dd_data;
2233         struct cxgbi_sock *csk;
2234         int len;
2235
2236         log_debug(1 << CXGBI_DBG_ISCSI,
2237                 "cls_conn 0x%p, param %d.\n", ep, param);
2238
2239         switch (param) {
2240         case ISCSI_PARAM_CONN_PORT:
2241         case ISCSI_PARAM_CONN_ADDRESS:
2242                 if (!cep)
2243                         return -ENOTCONN;
2244
2245                 csk = cep->csk;
2246                 if (!csk)
2247                         return -ENOTCONN;
2248
2249                 return iscsi_conn_get_addr_param((struct sockaddr_storage *)
2250                                                  &csk->daddr, param, buf);
2251         default:
2252                 return -ENOSYS;
2253         }
2254         return len;
2255 }
2256 EXPORT_SYMBOL_GPL(cxgbi_get_ep_param);
2257
2258 struct iscsi_cls_conn *
2259 cxgbi_create_conn(struct iscsi_cls_session *cls_session, u32 cid)
2260 {
2261         struct iscsi_cls_conn *cls_conn;
2262         struct iscsi_conn *conn;
2263         struct iscsi_tcp_conn *tcp_conn;
2264         struct cxgbi_conn *cconn;
2265
2266         cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*cconn), cid);
2267         if (!cls_conn)
2268                 return NULL;
2269
2270         conn = cls_conn->dd_data;
2271         tcp_conn = conn->dd_data;
2272         cconn = tcp_conn->dd_data;
2273         cconn->iconn = conn;
2274
2275         log_debug(1 << CXGBI_DBG_ISCSI,
2276                 "cid %u(0x%x), cls 0x%p,0x%p, conn 0x%p,0x%p,0x%p.\n",
2277                 cid, cid, cls_session, cls_conn, conn, tcp_conn, cconn);
2278
2279         return cls_conn;
2280 }
2281 EXPORT_SYMBOL_GPL(cxgbi_create_conn);
2282
2283 int cxgbi_bind_conn(struct iscsi_cls_session *cls_session,
2284                                 struct iscsi_cls_conn *cls_conn,
2285                                 u64 transport_eph, int is_leading)
2286 {
2287         struct iscsi_conn *conn = cls_conn->dd_data;
2288         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2289         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2290         struct cxgbi_ppm *ppm;
2291         struct iscsi_endpoint *ep;
2292         struct cxgbi_endpoint *cep;
2293         struct cxgbi_sock *csk;
2294         int err;
2295
2296         ep = iscsi_lookup_endpoint(transport_eph);
2297         if (!ep)
2298                 return -EINVAL;
2299
2300         /*  setup ddp pagesize */
2301         cep = ep->dd_data;
2302         csk = cep->csk;
2303
2304         ppm = csk->cdev->cdev2ppm(csk->cdev);
2305         err = csk->cdev->csk_ddp_setup_pgidx(csk, csk->tid,
2306                                              ppm->tformat.pgsz_idx_dflt, 0);
2307         if (err < 0)
2308                 return err;
2309
2310         err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
2311         if (err)
2312                 return -EINVAL;
2313
2314         /*  calculate the tag idx bits needed for this conn based on cmds_max */
2315         cconn->task_idx_bits = (__ilog2_u32(conn->session->cmds_max - 1)) + 1;
2316
2317         write_lock_bh(&csk->callback_lock);
2318         csk->user_data = conn;
2319         cconn->chba = cep->chba;
2320         cconn->cep = cep;
2321         cep->cconn = cconn;
2322         write_unlock_bh(&csk->callback_lock);
2323
2324         cxgbi_conn_max_xmit_dlength(conn);
2325         cxgbi_conn_max_recv_dlength(conn);
2326
2327         log_debug(1 << CXGBI_DBG_ISCSI,
2328                 "cls 0x%p,0x%p, ep 0x%p, cconn 0x%p, csk 0x%p.\n",
2329                 cls_session, cls_conn, ep, cconn, csk);
2330         /*  init recv engine */
2331         iscsi_tcp_hdr_recv_prep(tcp_conn);
2332
2333         return 0;
2334 }
2335 EXPORT_SYMBOL_GPL(cxgbi_bind_conn);
2336
2337 struct iscsi_cls_session *cxgbi_create_session(struct iscsi_endpoint *ep,
2338                                                 u16 cmds_max, u16 qdepth,
2339                                                 u32 initial_cmdsn)
2340 {
2341         struct cxgbi_endpoint *cep;
2342         struct cxgbi_hba *chba;
2343         struct Scsi_Host *shost;
2344         struct iscsi_cls_session *cls_session;
2345         struct iscsi_session *session;
2346
2347         if (!ep) {
2348                 pr_err("missing endpoint.\n");
2349                 return NULL;
2350         }
2351
2352         cep = ep->dd_data;
2353         chba = cep->chba;
2354         shost = chba->shost;
2355
2356         BUG_ON(chba != iscsi_host_priv(shost));
2357
2358         cls_session = iscsi_session_setup(chba->cdev->itp, shost,
2359                                         cmds_max, 0,
2360                                         sizeof(struct iscsi_tcp_task) +
2361                                         sizeof(struct cxgbi_task_data),
2362                                         initial_cmdsn, ISCSI_MAX_TARGET);
2363         if (!cls_session)
2364                 return NULL;
2365
2366         session = cls_session->dd_data;
2367         if (iscsi_tcp_r2tpool_alloc(session))
2368                 goto remove_session;
2369
2370         log_debug(1 << CXGBI_DBG_ISCSI,
2371                 "ep 0x%p, cls sess 0x%p.\n", ep, cls_session);
2372         return cls_session;
2373
2374 remove_session:
2375         iscsi_session_teardown(cls_session);
2376         return NULL;
2377 }
2378 EXPORT_SYMBOL_GPL(cxgbi_create_session);
2379
2380 void cxgbi_destroy_session(struct iscsi_cls_session *cls_session)
2381 {
2382         log_debug(1 << CXGBI_DBG_ISCSI,
2383                 "cls sess 0x%p.\n", cls_session);
2384
2385         iscsi_tcp_r2tpool_free(cls_session->dd_data);
2386         iscsi_session_teardown(cls_session);
2387 }
2388 EXPORT_SYMBOL_GPL(cxgbi_destroy_session);
2389
2390 int cxgbi_set_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2391                         char *buf, int buflen)
2392 {
2393         struct cxgbi_hba *chba = iscsi_host_priv(shost);
2394
2395         if (!chba->ndev) {
2396                 shost_printk(KERN_ERR, shost, "Could not get host param. "
2397                                 "netdev for host not set.\n");
2398                 return -ENODEV;
2399         }
2400
2401         log_debug(1 << CXGBI_DBG_ISCSI,
2402                 "shost 0x%p, hba 0x%p,%s, param %d, buf(%d) %s.\n",
2403                 shost, chba, chba->ndev->name, param, buflen, buf);
2404
2405         switch (param) {
2406         case ISCSI_HOST_PARAM_IPADDRESS:
2407         {
2408                 __be32 addr = in_aton(buf);
2409                 log_debug(1 << CXGBI_DBG_ISCSI,
2410                         "hba %s, req. ipv4 %pI4.\n", chba->ndev->name, &addr);
2411                 cxgbi_set_iscsi_ipv4(chba, addr);
2412                 return 0;
2413         }
2414         case ISCSI_HOST_PARAM_HWADDRESS:
2415         case ISCSI_HOST_PARAM_NETDEV_NAME:
2416                 return 0;
2417         default:
2418                 return iscsi_host_set_param(shost, param, buf, buflen);
2419         }
2420 }
2421 EXPORT_SYMBOL_GPL(cxgbi_set_host_param);
2422
2423 int cxgbi_get_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2424                         char *buf)
2425 {
2426         struct cxgbi_hba *chba = iscsi_host_priv(shost);
2427         int len = 0;
2428
2429         if (!chba->ndev) {
2430                 shost_printk(KERN_ERR, shost, "Could not get host param. "
2431                                 "netdev for host not set.\n");
2432                 return -ENODEV;
2433         }
2434
2435         log_debug(1 << CXGBI_DBG_ISCSI,
2436                 "shost 0x%p, hba 0x%p,%s, param %d.\n",
2437                 shost, chba, chba->ndev->name, param);
2438
2439         switch (param) {
2440         case ISCSI_HOST_PARAM_HWADDRESS:
2441                 len = sysfs_format_mac(buf, chba->ndev->dev_addr, 6);
2442                 break;
2443         case ISCSI_HOST_PARAM_NETDEV_NAME:
2444                 len = sprintf(buf, "%s\n", chba->ndev->name);
2445                 break;
2446         case ISCSI_HOST_PARAM_IPADDRESS:
2447         {
2448                 struct cxgbi_sock *csk = find_sock_on_port(chba->cdev,
2449                                                            chba->port_id);
2450                 if (csk) {
2451                         len = sprintf(buf, "%pIS",
2452                                       (struct sockaddr *)&csk->saddr);
2453                 }
2454                 log_debug(1 << CXGBI_DBG_ISCSI,
2455                           "hba %s, addr %s.\n", chba->ndev->name, buf);
2456                 break;
2457         }
2458         default:
2459                 return iscsi_host_get_param(shost, param, buf);
2460         }
2461
2462         return len;
2463 }
2464 EXPORT_SYMBOL_GPL(cxgbi_get_host_param);
2465
2466 struct iscsi_endpoint *cxgbi_ep_connect(struct Scsi_Host *shost,
2467                                         struct sockaddr *dst_addr,
2468                                         int non_blocking)
2469 {
2470         struct iscsi_endpoint *ep;
2471         struct cxgbi_endpoint *cep;
2472         struct cxgbi_hba *hba = NULL;
2473         struct cxgbi_sock *csk;
2474         int err = -EINVAL;
2475
2476         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2477                 "shost 0x%p, non_blocking %d, dst_addr 0x%p.\n",
2478                 shost, non_blocking, dst_addr);
2479
2480         if (shost) {
2481                 hba = iscsi_host_priv(shost);
2482                 if (!hba) {
2483                         pr_info("shost 0x%p, priv NULL.\n", shost);
2484                         goto err_out;
2485                 }
2486         }
2487
2488         if (dst_addr->sa_family == AF_INET) {
2489                 csk = cxgbi_check_route(dst_addr);
2490 #if IS_ENABLED(CONFIG_IPV6)
2491         } else if (dst_addr->sa_family == AF_INET6) {
2492                 csk = cxgbi_check_route6(dst_addr);
2493 #endif
2494         } else {
2495                 pr_info("address family 0x%x NOT supported.\n",
2496                         dst_addr->sa_family);
2497                 err = -EAFNOSUPPORT;
2498                 return (struct iscsi_endpoint *)ERR_PTR(err);
2499         }
2500
2501         if (IS_ERR(csk))
2502                 return (struct iscsi_endpoint *)csk;
2503         cxgbi_sock_get(csk);
2504
2505         if (!hba)
2506                 hba = csk->cdev->hbas[csk->port_id];
2507         else if (hba != csk->cdev->hbas[csk->port_id]) {
2508                 pr_info("Could not connect through requested host %u"
2509                         "hba 0x%p != 0x%p (%u).\n",
2510                         shost->host_no, hba,
2511                         csk->cdev->hbas[csk->port_id], csk->port_id);
2512                 err = -ENOSPC;
2513                 goto release_conn;
2514         }
2515
2516         err = sock_get_port(csk);
2517         if (err)
2518                 goto release_conn;
2519
2520         cxgbi_sock_set_state(csk, CTP_CONNECTING);
2521         err = csk->cdev->csk_init_act_open(csk);
2522         if (err)
2523                 goto release_conn;
2524
2525         if (cxgbi_sock_is_closing(csk)) {
2526                 err = -ENOSPC;
2527                 pr_info("csk 0x%p is closing.\n", csk);
2528                 goto release_conn;
2529         }
2530
2531         ep = iscsi_create_endpoint(sizeof(*cep));
2532         if (!ep) {
2533                 err = -ENOMEM;
2534                 pr_info("iscsi alloc ep, OOM.\n");
2535                 goto release_conn;
2536         }
2537
2538         cep = ep->dd_data;
2539         cep->csk = csk;
2540         cep->chba = hba;
2541
2542         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2543                 "ep 0x%p, cep 0x%p, csk 0x%p, hba 0x%p,%s.\n",
2544                 ep, cep, csk, hba, hba->ndev->name);
2545         return ep;
2546
2547 release_conn:
2548         cxgbi_sock_put(csk);
2549         cxgbi_sock_closed(csk);
2550 err_out:
2551         return ERR_PTR(err);
2552 }
2553 EXPORT_SYMBOL_GPL(cxgbi_ep_connect);
2554
2555 int cxgbi_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
2556 {
2557         struct cxgbi_endpoint *cep = ep->dd_data;
2558         struct cxgbi_sock *csk = cep->csk;
2559
2560         if (!cxgbi_sock_is_established(csk))
2561                 return 0;
2562         return 1;
2563 }
2564 EXPORT_SYMBOL_GPL(cxgbi_ep_poll);
2565
2566 void cxgbi_ep_disconnect(struct iscsi_endpoint *ep)
2567 {
2568         struct cxgbi_endpoint *cep = ep->dd_data;
2569         struct cxgbi_conn *cconn = cep->cconn;
2570         struct cxgbi_sock *csk = cep->csk;
2571
2572         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2573                 "ep 0x%p, cep 0x%p, cconn 0x%p, csk 0x%p,%u,0x%lx.\n",
2574                 ep, cep, cconn, csk, csk->state, csk->flags);
2575
2576         if (cconn && cconn->iconn) {
2577                 iscsi_suspend_tx(cconn->iconn);
2578                 write_lock_bh(&csk->callback_lock);
2579                 cep->csk->user_data = NULL;
2580                 cconn->cep = NULL;
2581                 write_unlock_bh(&csk->callback_lock);
2582         }
2583         iscsi_destroy_endpoint(ep);
2584
2585         if (likely(csk->state >= CTP_ESTABLISHED))
2586                 need_active_close(csk);
2587         else
2588                 cxgbi_sock_closed(csk);
2589
2590         cxgbi_sock_put(csk);
2591 }
2592 EXPORT_SYMBOL_GPL(cxgbi_ep_disconnect);
2593
2594 int cxgbi_iscsi_init(struct iscsi_transport *itp,
2595                         struct scsi_transport_template **stt)
2596 {
2597         *stt = iscsi_register_transport(itp);
2598         if (*stt == NULL) {
2599                 pr_err("unable to register %s transport 0x%p.\n",
2600                         itp->name, itp);
2601                 return -ENODEV;
2602         }
2603         log_debug(1 << CXGBI_DBG_ISCSI,
2604                 "%s, registered iscsi transport 0x%p.\n",
2605                 itp->name, stt);
2606         return 0;
2607 }
2608 EXPORT_SYMBOL_GPL(cxgbi_iscsi_init);
2609
2610 void cxgbi_iscsi_cleanup(struct iscsi_transport *itp,
2611                         struct scsi_transport_template **stt)
2612 {
2613         if (*stt) {
2614                 log_debug(1 << CXGBI_DBG_ISCSI,
2615                         "de-register transport 0x%p, %s, stt 0x%p.\n",
2616                         itp, itp->name, *stt);
2617                 *stt = NULL;
2618                 iscsi_unregister_transport(itp);
2619         }
2620 }
2621 EXPORT_SYMBOL_GPL(cxgbi_iscsi_cleanup);
2622
2623 umode_t cxgbi_attr_is_visible(int param_type, int param)
2624 {
2625         switch (param_type) {
2626         case ISCSI_HOST_PARAM:
2627                 switch (param) {
2628                 case ISCSI_HOST_PARAM_NETDEV_NAME:
2629                 case ISCSI_HOST_PARAM_HWADDRESS:
2630                 case ISCSI_HOST_PARAM_IPADDRESS:
2631                 case ISCSI_HOST_PARAM_INITIATOR_NAME:
2632                         return S_IRUGO;
2633                 default:
2634                         return 0;
2635                 }
2636         case ISCSI_PARAM:
2637                 switch (param) {
2638                 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2639                 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2640                 case ISCSI_PARAM_HDRDGST_EN:
2641                 case ISCSI_PARAM_DATADGST_EN:
2642                 case ISCSI_PARAM_CONN_ADDRESS:
2643                 case ISCSI_PARAM_CONN_PORT:
2644                 case ISCSI_PARAM_EXP_STATSN:
2645                 case ISCSI_PARAM_PERSISTENT_ADDRESS:
2646                 case ISCSI_PARAM_PERSISTENT_PORT:
2647                 case ISCSI_PARAM_PING_TMO:
2648                 case ISCSI_PARAM_RECV_TMO:
2649                 case ISCSI_PARAM_INITIAL_R2T_EN:
2650                 case ISCSI_PARAM_MAX_R2T:
2651                 case ISCSI_PARAM_IMM_DATA_EN:
2652                 case ISCSI_PARAM_FIRST_BURST:
2653                 case ISCSI_PARAM_MAX_BURST:
2654                 case ISCSI_PARAM_PDU_INORDER_EN:
2655                 case ISCSI_PARAM_DATASEQ_INORDER_EN:
2656                 case ISCSI_PARAM_ERL:
2657                 case ISCSI_PARAM_TARGET_NAME:
2658                 case ISCSI_PARAM_TPGT:
2659                 case ISCSI_PARAM_USERNAME:
2660                 case ISCSI_PARAM_PASSWORD:
2661                 case ISCSI_PARAM_USERNAME_IN:
2662                 case ISCSI_PARAM_PASSWORD_IN:
2663                 case ISCSI_PARAM_FAST_ABORT:
2664                 case ISCSI_PARAM_ABORT_TMO:
2665                 case ISCSI_PARAM_LU_RESET_TMO:
2666                 case ISCSI_PARAM_TGT_RESET_TMO:
2667                 case ISCSI_PARAM_IFACE_NAME:
2668                 case ISCSI_PARAM_INITIATOR_NAME:
2669                         return S_IRUGO;
2670                 default:
2671                         return 0;
2672                 }
2673         }
2674
2675         return 0;
2676 }
2677 EXPORT_SYMBOL_GPL(cxgbi_attr_is_visible);
2678
2679 static int __init libcxgbi_init_module(void)
2680 {
2681         pr_info("%s", version);
2682         return 0;
2683 }
2684
2685 static void __exit libcxgbi_exit_module(void)
2686 {
2687         cxgbi_device_unregister_all(0xFF);
2688         return;
2689 }
2690
2691 module_init(libcxgbi_init_module);
2692 module_exit(libcxgbi_exit_module);