drivers/scsi/cxgbi/libcxgbi.c

   1 /*
   2  * libcxgbi.c: Chelsio common library for T3/T4 iSCSI driver.
   3  *
   4  * Copyright (c) 2010-2015 Chelsio Communications, Inc.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation.
   9  *
  10  * Written by: Karen Xie (kxie@chelsio.com)
  11  * Written by: Rakesh Ranjan (rranjan@chelsio.com)
  12  */
  13
  14 #define pr_fmt(fmt)     KBUILD_MODNAME ":%s: " fmt, __func__
  15
  16 #include <linux/skbuff.h>
  17 #include <linux/crypto.h>
  18 #include <linux/scatterlist.h>
  19 #include <linux/pci.h>
  20 #include <scsi/scsi.h>
  21 #include <scsi/scsi_cmnd.h>
  22 #include <scsi/scsi_host.h>
  23 #include <linux/if_vlan.h>
  24 #include <linux/inet.h>
  25 #include <net/dst.h>
  26 #include <net/route.h>
  27 #include <net/ipv6.h>
  28 #include <net/ip6_route.h>
  29 #include <net/addrconf.h>
  30
  31 #include <linux/inetdevice.h>   /* ip_dev_find */
  32 #include <linux/module.h>
  33 #include <net/tcp.h>
  34
  35 static unsigned int dbg_level;
  36
  37 #include "libcxgbi.h"
  38
  39 #define DRV_MODULE_NAME         "libcxgbi"
  40 #define DRV_MODULE_DESC         "Chelsio iSCSI driver library"
  41 #define DRV_MODULE_VERSION      "0.9.1-ko"
  42 #define DRV_MODULE_RELDATE      "Apr. 2015"
  43
  44 static char version[] =
  45         DRV_MODULE_DESC " " DRV_MODULE_NAME
  46         " v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
  47
  48 MODULE_AUTHOR("Chelsio Communications, Inc.");
  49 MODULE_DESCRIPTION(DRV_MODULE_DESC);
  50 MODULE_VERSION(DRV_MODULE_VERSION);
  51 MODULE_LICENSE("GPL");
  52
  53 module_param(dbg_level, uint, 0644);
  54 MODULE_PARM_DESC(dbg_level, "libiscsi debug level (default=0)");
  55
  56
  57 /*
  58  * cxgbi device management
  59  * maintains a list of the cxgbi devices
  60  */
  61 static LIST_HEAD(cdev_list);
  62 static DEFINE_MUTEX(cdev_mutex);
  63
  64 static LIST_HEAD(cdev_rcu_list);
  65 static DEFINE_SPINLOCK(cdev_rcu_lock);
  66
  67 static inline void cxgbi_decode_sw_tag(u32 sw_tag, int *idx, int *age)
  68 {
  69         if (age)
  70                 *age = sw_tag & 0x7FFF;
  71         if (idx)
  72                 *idx = (sw_tag >> 16) & 0x7FFF;
  73 }
  74
  75 int cxgbi_device_portmap_create(struct cxgbi_device *cdev, unsigned int base,
  76                                 unsigned int max_conn)
  77 {
  78         struct cxgbi_ports_map *pmap = &cdev->pmap;
  79
  80         pmap->port_csk = cxgbi_alloc_big_mem(max_conn *
  81                                              sizeof(struct cxgbi_sock *),
  82                                              GFP_KERNEL);
  83         if (!pmap->port_csk) {
  84                 pr_warn("cdev 0x%p, portmap OOM %u.\n", cdev, max_conn);
  85                 return -ENOMEM;
  86         }
  87
  88         pmap->max_connect = max_conn;
  89         pmap->sport_base = base;
  90         spin_lock_init(&pmap->lock);
  91         return 0;
  92 }
  93 EXPORT_SYMBOL_GPL(cxgbi_device_portmap_create);
  94
  95 void cxgbi_device_portmap_cleanup(struct cxgbi_device *cdev)
  96 {
  97         struct cxgbi_ports_map *pmap = &cdev->pmap;
  98         struct cxgbi_sock *csk;
  99         int i;
 100
 101         for (i = 0; i < pmap->max_connect; i++) {
 102                 if (pmap->port_csk[i]) {
 103                         csk = pmap->port_csk[i];
 104                         pmap->port_csk[i] = NULL;
 105                         log_debug(1 << CXGBI_DBG_SOCK,
 106                                 "csk 0x%p, cdev 0x%p, offload down.\n",
 107                                 csk, cdev);
 108                         spin_lock_bh(&csk->lock);
 109                         cxgbi_sock_set_flag(csk, CTPF_OFFLOAD_DOWN);
 110                         cxgbi_sock_closed(csk);
 111                         spin_unlock_bh(&csk->lock);
 112                         cxgbi_sock_put(csk);
 113                 }
 114         }
 115 }
 116 EXPORT_SYMBOL_GPL(cxgbi_device_portmap_cleanup);
 117
 118 static inline void cxgbi_device_destroy(struct cxgbi_device *cdev)
 119 {
 120         log_debug(1 << CXGBI_DBG_DEV,
 121                 "cdev 0x%p, p# %u.\n", cdev, cdev->nports);
 122         cxgbi_hbas_remove(cdev);
 123         cxgbi_device_portmap_cleanup(cdev);
 124         cxgbi_ppm_release(cdev->cdev2ppm(cdev));
 125         if (cdev->pmap.max_connect)
 126                 cxgbi_free_big_mem(cdev->pmap.port_csk);
 127         kfree(cdev);
 128 }
 129
 130 struct cxgbi_device *cxgbi_device_register(unsigned int extra,
 131                                            unsigned int nports)
 132 {
 133         struct cxgbi_device *cdev;
 134
 135         cdev = kzalloc(sizeof(*cdev) + extra + nports *
 136                         (sizeof(struct cxgbi_hba *) +
 137                          sizeof(struct net_device *)),
 138                         GFP_KERNEL);
 139         if (!cdev) {
 140                 pr_warn("nport %d, OOM.\n", nports);
 141                 return NULL;
 142         }
 143         cdev->ports = (struct net_device **)(cdev + 1);
 144         cdev->hbas = (struct cxgbi_hba **)(((char*)cdev->ports) + nports *
 145                                                 sizeof(struct net_device *));
 146         if (extra)
 147                 cdev->dd_data = ((char *)cdev->hbas) +
 148                                 nports * sizeof(struct cxgbi_hba *);
 149         spin_lock_init(&cdev->pmap.lock);
 150
 151         mutex_lock(&cdev_mutex);
 152         list_add_tail(&cdev->list_head, &cdev_list);
 153         mutex_unlock(&cdev_mutex);
 154
 155         spin_lock(&cdev_rcu_lock);
 156         list_add_tail_rcu(&cdev->rcu_node, &cdev_rcu_list);
 157         spin_unlock(&cdev_rcu_lock);
 158
 159         log_debug(1 << CXGBI_DBG_DEV,
 160                 "cdev 0x%p, p# %u.\n", cdev, nports);
 161         return cdev;
 162 }
 163 EXPORT_SYMBOL_GPL(cxgbi_device_register);
 164
 165 void cxgbi_device_unregister(struct cxgbi_device *cdev)
 166 {
 167         log_debug(1 << CXGBI_DBG_DEV,
 168                 "cdev 0x%p, p# %u,%s.\n",
 169                 cdev, cdev->nports, cdev->nports ? cdev->ports[0]->name : "");
 170
 171         mutex_lock(&cdev_mutex);
 172         list_del(&cdev->list_head);
 173         mutex_unlock(&cdev_mutex);
 174
 175         spin_lock(&cdev_rcu_lock);
 176         list_del_rcu(&cdev->rcu_node);
 177         spin_unlock(&cdev_rcu_lock);
 178         synchronize_rcu();
 179
 180         cxgbi_device_destroy(cdev);
 181 }
 182 EXPORT_SYMBOL_GPL(cxgbi_device_unregister);
 183
 184 void cxgbi_device_unregister_all(unsigned int flag)
 185 {
 186         struct cxgbi_device *cdev, *tmp;
 187
 188         mutex_lock(&cdev_mutex);
 189         list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
 190                 if ((cdev->flags & flag) == flag) {
 191                         mutex_unlock(&cdev_mutex);
 192                         cxgbi_device_unregister(cdev);
 193                         mutex_lock(&cdev_mutex);
 194                 }
 195         }
 196         mutex_unlock(&cdev_mutex);
 197 }
 198 EXPORT_SYMBOL_GPL(cxgbi_device_unregister_all);
 199
 200 struct cxgbi_device *cxgbi_device_find_by_lldev(void *lldev)
 201 {
 202         struct cxgbi_device *cdev, *tmp;
 203
 204         mutex_lock(&cdev_mutex);
 205         list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
 206                 if (cdev->lldev == lldev) {
 207                         mutex_unlock(&cdev_mutex);
 208                         return cdev;
 209                 }
 210         }
 211         mutex_unlock(&cdev_mutex);
 212
 213         log_debug(1 << CXGBI_DBG_DEV,
 214                 "lldev 0x%p, NO match found.\n", lldev);
 215         return NULL;
 216 }
 217 EXPORT_SYMBOL_GPL(cxgbi_device_find_by_lldev);
 218
 219 struct cxgbi_device *cxgbi_device_find_by_netdev(struct net_device *ndev,
 220                                                  int *port)
 221 {
 222         struct net_device *vdev = NULL;
 223         struct cxgbi_device *cdev, *tmp;
 224         int i;
 225
 226         if (is_vlan_dev(ndev)) {
 227                 vdev = ndev;
 228                 ndev = vlan_dev_real_dev(ndev);
 229                 log_debug(1 << CXGBI_DBG_DEV,
 230                         "vlan dev %s -> %s.\n", vdev->name, ndev->name);
 231         }
 232
 233         mutex_lock(&cdev_mutex);
 234         list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
 235                 for (i = 0; i < cdev->nports; i++) {
 236                         if (ndev == cdev->ports[i]) {
 237                                 cdev->hbas[i]->vdev = vdev;
 238                                 mutex_unlock(&cdev_mutex);
 239                                 if (port)
 240                                         *port = i;
 241                                 return cdev;
 242                         }
 243                 }
 244         }
 245         mutex_unlock(&cdev_mutex);
 246         log_debug(1 << CXGBI_DBG_DEV,
 247                 "ndev 0x%p, %s, NO match found.\n", ndev, ndev->name);
 248         return NULL;
 249 }
 250 EXPORT_SYMBOL_GPL(cxgbi_device_find_by_netdev);
 251
 252 struct cxgbi_device *cxgbi_device_find_by_netdev_rcu(struct net_device *ndev,
 253                                                      int *port)
 254 {
 255         struct net_device *vdev = NULL;
 256         struct cxgbi_device *cdev;
 257         int i;
 258
 259         if (is_vlan_dev(ndev)) {
 260                 vdev = ndev;
 261                 ndev = vlan_dev_real_dev(ndev);
 262                 pr_info("vlan dev %s -> %s.\n", vdev->name, ndev->name);
 263         }
 264
 265         rcu_read_lock();
 266         list_for_each_entry_rcu(cdev, &cdev_rcu_list, rcu_node) {
 267                 for (i = 0; i < cdev->nports; i++) {
 268                         if (ndev == cdev->ports[i]) {
 269                                 cdev->hbas[i]->vdev = vdev;
 270                                 rcu_read_unlock();
 271                                 if (port)
 272                                         *port = i;
 273                                 return cdev;
 274                         }
 275                 }
 276         }
 277         rcu_read_unlock();
 278
 279         log_debug(1 << CXGBI_DBG_DEV,
 280                   "ndev 0x%p, %s, NO match found.\n", ndev, ndev->name);
 281         return NULL;
 282 }
 283 EXPORT_SYMBOL_GPL(cxgbi_device_find_by_netdev_rcu);
 284
 285 #if IS_ENABLED(CONFIG_IPV6)
 286 static struct cxgbi_device *cxgbi_device_find_by_mac(struct net_device *ndev,
 287                                                      int *port)
 288 {
 289         struct net_device *vdev = NULL;
 290         struct cxgbi_device *cdev, *tmp;
 291         int i;
 292
 293         if (is_vlan_dev(ndev)) {
 294                 vdev = ndev;
 295                 ndev = vlan_dev_real_dev(ndev);
 296                 pr_info("vlan dev %s -> %s.\n", vdev->name, ndev->name);
 297         }
 298
 299         mutex_lock(&cdev_mutex);
 300         list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
 301                 for (i = 0; i < cdev->nports; i++) {
 302                         if (!memcmp(ndev->dev_addr, cdev->ports[i]->dev_addr,
 303                                     MAX_ADDR_LEN)) {
 304                                 cdev->hbas[i]->vdev = vdev;
 305                                 mutex_unlock(&cdev_mutex);
 306                                 if (port)
 307                                         *port = i;
 308                                 return cdev;
 309                         }
 310                 }
 311         }
 312         mutex_unlock(&cdev_mutex);
 313         log_debug(1 << CXGBI_DBG_DEV,
 314                   "ndev 0x%p, %s, NO match mac found.\n",
 315                   ndev, ndev->name);
 316         return NULL;
 317 }
 318 #endif
 319
 320 void cxgbi_hbas_remove(struct cxgbi_device *cdev)
 321 {
 322         int i;
 323         struct cxgbi_hba *chba;
 324
 325         log_debug(1 << CXGBI_DBG_DEV,
 326                 "cdev 0x%p, p#%u.\n", cdev, cdev->nports);
 327
 328         for (i = 0; i < cdev->nports; i++) {
 329                 chba = cdev->hbas[i];
 330                 if (chba) {
 331                         cdev->hbas[i] = NULL;
 332                         iscsi_host_remove(chba->shost);
 333                         pci_dev_put(cdev->pdev);
 334                         iscsi_host_free(chba->shost);
 335                 }
 336         }
 337 }
 338 EXPORT_SYMBOL_GPL(cxgbi_hbas_remove);
 339
 340 int cxgbi_hbas_add(struct cxgbi_device *cdev, u64 max_lun,
 341                 unsigned int max_id, struct scsi_host_template *sht,
 342                 struct scsi_transport_template *stt)
 343 {
 344         struct cxgbi_hba *chba;
 345         struct Scsi_Host *shost;
 346         int i, err;
 347
 348         log_debug(1 << CXGBI_DBG_DEV, "cdev 0x%p, p#%u.\n", cdev, cdev->nports);
 349
 350         for (i = 0; i < cdev->nports; i++) {
 351                 shost = iscsi_host_alloc(sht, sizeof(*chba), 1);
 352                 if (!shost) {
 353                         pr_info("0x%p, p%d, %s, host alloc failed.\n",
 354                                 cdev, i, cdev->ports[i]->name);
 355                         err = -ENOMEM;
 356                         goto err_out;
 357                 }
 358
 359                 shost->transportt = stt;
 360                 shost->max_lun = max_lun;
 361                 shost->max_id = max_id;
 362                 shost->max_channel = 0;
 363                 shost->max_cmd_len = 16;
 364
 365                 chba = iscsi_host_priv(shost);
 366                 chba->cdev = cdev;
 367                 chba->ndev = cdev->ports[i];
 368                 chba->shost = shost;
 369
 370                 log_debug(1 << CXGBI_DBG_DEV,
 371                         "cdev 0x%p, p#%d %s: chba 0x%p.\n",
 372                         cdev, i, cdev->ports[i]->name, chba);
 373
 374                 pci_dev_get(cdev->pdev);
 375                 err = iscsi_host_add(shost, &cdev->pdev->dev);
 376                 if (err) {
 377                         pr_info("cdev 0x%p, p#%d %s, host add failed.\n",
 378                                 cdev, i, cdev->ports[i]->name);
 379                         pci_dev_put(cdev->pdev);
 380                         scsi_host_put(shost);
 381                         goto  err_out;
 382                 }
 383
 384                 cdev->hbas[i] = chba;
 385         }
 386
 387         return 0;
 388
 389 err_out:
 390         cxgbi_hbas_remove(cdev);
 391         return err;
 392 }
 393 EXPORT_SYMBOL_GPL(cxgbi_hbas_add);
 394
 395 /*
 396  * iSCSI offload
 397  *
 398  * - source port management
 399  *   To find a free source port in the port allocation map we use a very simple
 400  *   rotor scheme to look for the next free port.
 401  *
 402  *   If a source port has been specified make sure that it doesn't collide with
 403  *   our normal source port allocation map.  If it's outside the range of our
 404  *   allocation/deallocation scheme just let them use it.
 405  *
 406  *   If the source port is outside our allocation range, the caller is
 407  *   responsible for keeping track of their port usage.
 408  */
 409
 410 static struct cxgbi_sock *find_sock_on_port(struct cxgbi_device *cdev,
 411                                             unsigned char port_id)
 412 {
 413         struct cxgbi_ports_map *pmap = &cdev->pmap;
 414         unsigned int i;
 415         unsigned int used;
 416
 417         if (!pmap->max_connect || !pmap->used)
 418                 return NULL;
 419
 420         spin_lock_bh(&pmap->lock);
 421         used = pmap->used;
 422         for (i = 0; used && i < pmap->max_connect; i++) {
 423                 struct cxgbi_sock *csk = pmap->port_csk[i];
 424
 425                 if (csk) {
 426                         if (csk->port_id == port_id) {
 427                                 spin_unlock_bh(&pmap->lock);
 428                                 return csk;
 429                         }
 430                         used--;
 431                 }
 432         }
 433         spin_unlock_bh(&pmap->lock);
 434
 435         return NULL;
 436 }
 437
 438 static int sock_get_port(struct cxgbi_sock *csk)
 439 {
 440         struct cxgbi_device *cdev = csk->cdev;
 441         struct cxgbi_ports_map *pmap = &cdev->pmap;
 442         unsigned int start;
 443         int idx;
 444         __be16 *port;
 445
 446         if (!pmap->max_connect) {
 447                 pr_err("cdev 0x%p, p#%u %s, NO port map.\n",
 448                            cdev, csk->port_id, cdev->ports[csk->port_id]->name);
 449                 return -EADDRNOTAVAIL;
 450         }
 451
 452         if (csk->csk_family == AF_INET)
 453                 port = &csk->saddr.sin_port;
 454         else /* ipv6 */
 455                 port = &csk->saddr6.sin6_port;
 456
 457         if (*port) {
 458                 pr_err("source port NON-ZERO %u.\n",
 459                         ntohs(*port));
 460                 return -EADDRINUSE;
 461         }
 462
 463         spin_lock_bh(&pmap->lock);
 464         if (pmap->used >= pmap->max_connect) {
 465                 spin_unlock_bh(&pmap->lock);
 466                 pr_info("cdev 0x%p, p#%u %s, ALL ports used.\n",
 467                         cdev, csk->port_id, cdev->ports[csk->port_id]->name);
 468                 return -EADDRNOTAVAIL;
 469         }
 470
 471         start = idx = pmap->next;
 472         do {
 473                 if (++idx >= pmap->max_connect)
 474                         idx = 0;
 475                 if (!pmap->port_csk[idx]) {
 476                         pmap->used++;
 477                         *port = htons(pmap->sport_base + idx);
 478                         pmap->next = idx;
 479                         pmap->port_csk[idx] = csk;
 480                         spin_unlock_bh(&pmap->lock);
 481                         cxgbi_sock_get(csk);
 482                         log_debug(1 << CXGBI_DBG_SOCK,
 483                                 "cdev 0x%p, p#%u %s, p %u, %u.\n",
 484                                 cdev, csk->port_id,
 485                                 cdev->ports[csk->port_id]->name,
 486                                 pmap->sport_base + idx, pmap->next);
 487                         return 0;
 488                 }
 489         } while (idx != start);
 490         spin_unlock_bh(&pmap->lock);
 491
 492         /* should not happen */
 493         pr_warn("cdev 0x%p, p#%u %s, next %u?\n",
 494                 cdev, csk->port_id, cdev->ports[csk->port_id]->name,
 495                 pmap->next);
 496         return -EADDRNOTAVAIL;
 497 }
 498
 499 static void sock_put_port(struct cxgbi_sock *csk)
 500 {
 501         struct cxgbi_device *cdev = csk->cdev;
 502         struct cxgbi_ports_map *pmap = &cdev->pmap;
 503         __be16 *port;
 504
 505         if (csk->csk_family == AF_INET)
 506                 port = &csk->saddr.sin_port;
 507         else /* ipv6 */
 508                 port = &csk->saddr6.sin6_port;
 509
 510         if (*port) {
 511                 int idx = ntohs(*port) - pmap->sport_base;
 512
 513                 *port = 0;
 514                 if (idx < 0 || idx >= pmap->max_connect) {
 515                         pr_err("cdev 0x%p, p#%u %s, port %u OOR.\n",
 516                                 cdev, csk->port_id,
 517                                 cdev->ports[csk->port_id]->name,
 518                                 ntohs(*port));
 519                         return;
 520                 }
 521
 522                 spin_lock_bh(&pmap->lock);
 523                 pmap->port_csk[idx] = NULL;
 524                 pmap->used--;
 525                 spin_unlock_bh(&pmap->lock);
 526
 527                 log_debug(1 << CXGBI_DBG_SOCK,
 528                         "cdev 0x%p, p#%u %s, release %u.\n",
 529                         cdev, csk->port_id, cdev->ports[csk->port_id]->name,
 530                         pmap->sport_base + idx);
 531
 532                 cxgbi_sock_put(csk);
 533         }
 534 }
 535
 536 /*
 537  * iscsi tcp connection
 538  */
 539 void cxgbi_sock_free_cpl_skbs(struct cxgbi_sock *csk)
 540 {
 541         if (csk->cpl_close) {
 542                 kfree_skb(csk->cpl_close);
 543                 csk->cpl_close = NULL;
 544         }
 545         if (csk->cpl_abort_req) {
 546                 kfree_skb(csk->cpl_abort_req);
 547                 csk->cpl_abort_req = NULL;
 548         }
 549         if (csk->cpl_abort_rpl) {
 550                 kfree_skb(csk->cpl_abort_rpl);
 551                 csk->cpl_abort_rpl = NULL;
 552         }
 553 }
 554 EXPORT_SYMBOL_GPL(cxgbi_sock_free_cpl_skbs);
 555
 556 static struct cxgbi_sock *cxgbi_sock_create(struct cxgbi_device *cdev)
 557 {
 558         struct cxgbi_sock *csk = kzalloc(sizeof(*csk), GFP_NOIO);
 559
 560         if (!csk) {
 561                 pr_info("alloc csk %zu failed.\n", sizeof(*csk));
 562                 return NULL;
 563         }
 564
 565         if (cdev->csk_alloc_cpls(csk) < 0) {
 566                 pr_info("csk 0x%p, alloc cpls failed.\n", csk);
 567                 kfree(csk);
 568                 return NULL;
 569         }
 570
 571         spin_lock_init(&csk->lock);
 572         kref_init(&csk->refcnt);
 573         skb_queue_head_init(&csk->receive_queue);
 574         skb_queue_head_init(&csk->write_queue);
 575         setup_timer(&csk->retry_timer, NULL, (unsigned long)csk);
 576         rwlock_init(&csk->callback_lock);
 577         csk->cdev = cdev;
 578         csk->flags = 0;
 579         cxgbi_sock_set_state(csk, CTP_CLOSED);
 580
 581         log_debug(1 << CXGBI_DBG_SOCK, "cdev 0x%p, new csk 0x%p.\n", cdev, csk);
 582
 583         return csk;
 584 }
 585
 586 static struct rtable *find_route_ipv4(struct flowi4 *fl4,
 587                                       __be32 saddr, __be32 daddr,
 588                                       __be16 sport, __be16 dport, u8 tos)
 589 {
 590         struct rtable *rt;
 591
 592         rt = ip_route_output_ports(&init_net, fl4, NULL, daddr, saddr,
 593                                    dport, sport, IPPROTO_TCP, tos, 0);
 594         if (IS_ERR(rt))
 595                 return NULL;
 596
 597         return rt;
 598 }
 599
 600 static struct cxgbi_sock *cxgbi_check_route(struct sockaddr *dst_addr)
 601 {
 602         struct sockaddr_in *daddr = (struct sockaddr_in *)dst_addr;
 603         struct dst_entry *dst;
 604         struct net_device *ndev;
 605         struct cxgbi_device *cdev;
 606         struct rtable *rt = NULL;
 607         struct neighbour *n;
 608         struct flowi4 fl4;
 609         struct cxgbi_sock *csk = NULL;
 610         unsigned int mtu = 0;
 611         int port = 0xFFFF;
 612         int err = 0;
 613
 614         rt = find_route_ipv4(&fl4, 0, daddr->sin_addr.s_addr, 0, daddr->sin_port, 0);
 615         if (!rt) {
 616                 pr_info("no route to ipv4 0x%x, port %u.\n",
 617                         be32_to_cpu(daddr->sin_addr.s_addr),
 618                         be16_to_cpu(daddr->sin_port));
 619                 err = -ENETUNREACH;
 620                 goto err_out;
 621         }
 622         dst = &rt->dst;
 623         n = dst_neigh_lookup(dst, &daddr->sin_addr.s_addr);
 624         if (!n) {
 625                 err = -ENODEV;
 626                 goto rel_rt;
 627         }
 628         ndev = n->dev;
 629
 630         if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) {
 631                 pr_info("multi-cast route %pI4, port %u, dev %s.\n",
 632                         &daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
 633                         ndev->name);
 634                 err = -ENETUNREACH;
 635                 goto rel_neigh;
 636         }
 637
 638         if (ndev->flags & IFF_LOOPBACK) {
 639                 ndev = ip_dev_find(&init_net, daddr->sin_addr.s_addr);
 640                 mtu = ndev->mtu;
 641                 pr_info("rt dev %s, loopback -> %s, mtu %u.\n",
 642                         n->dev->name, ndev->name, mtu);
 643         }
 644
 645         if (!(ndev->flags & IFF_UP) || !netif_carrier_ok(ndev)) {
 646                 pr_info("%s interface not up.\n", ndev->name);
 647                 err = -ENETDOWN;
 648                 goto rel_neigh;
 649         }
 650
 651         cdev = cxgbi_device_find_by_netdev(ndev, &port);
 652         if (!cdev) {
 653                 pr_info("dst %pI4, %s, NOT cxgbi device.\n",
 654                         &daddr->sin_addr.s_addr, ndev->name);
 655                 err = -ENETUNREACH;
 656                 goto rel_neigh;
 657         }
 658         log_debug(1 << CXGBI_DBG_SOCK,
 659                 "route to %pI4 :%u, ndev p#%d,%s, cdev 0x%p.\n",
 660                 &daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
 661                            port, ndev->name, cdev);
 662
 663         csk = cxgbi_sock_create(cdev);
 664         if (!csk) {
 665                 err = -ENOMEM;
 666                 goto rel_neigh;
 667         }
 668         csk->cdev = cdev;
 669         csk->port_id = port;
 670         csk->mtu = mtu;
 671         csk->dst = dst;
 672
 673         csk->csk_family = AF_INET;
 674         csk->daddr.sin_addr.s_addr = daddr->sin_addr.s_addr;
 675         csk->daddr.sin_port = daddr->sin_port;
 676         csk->daddr.sin_family = daddr->sin_family;
 677         csk->saddr.sin_family = daddr->sin_family;
 678         csk->saddr.sin_addr.s_addr = fl4.saddr;
 679         neigh_release(n);
 680
 681         return csk;
 682
 683 rel_neigh:
 684         neigh_release(n);
 685
 686 rel_rt:
 687         ip_rt_put(rt);
 688         if (csk)
 689                 cxgbi_sock_closed(csk);
 690 err_out:
 691         return ERR_PTR(err);
 692 }
 693
 694 #if IS_ENABLED(CONFIG_IPV6)
 695 static struct rt6_info *find_route_ipv6(const struct in6_addr *saddr,
 696                                         const struct in6_addr *daddr)
 697 {
 698         struct flowi6 fl;
 699
 700         memset(&fl, 0, sizeof(fl));
 701         if (saddr)
 702                 memcpy(&fl.saddr, saddr, sizeof(struct in6_addr));
 703         if (daddr)
 704                 memcpy(&fl.daddr, daddr, sizeof(struct in6_addr));
 705         return (struct rt6_info *)ip6_route_output(&init_net, NULL, &fl);
 706 }
 707
 708 static struct cxgbi_sock *cxgbi_check_route6(struct sockaddr *dst_addr)
 709 {
 710         struct sockaddr_in6 *daddr6 = (struct sockaddr_in6 *)dst_addr;
 711         struct dst_entry *dst;
 712         struct net_device *ndev;
 713         struct cxgbi_device *cdev;
 714         struct rt6_info *rt = NULL;
 715         struct neighbour *n;
 716         struct in6_addr pref_saddr;
 717         struct cxgbi_sock *csk = NULL;
 718         unsigned int mtu = 0;
 719         int port = 0xFFFF;
 720         int err = 0;
 721
 722         rt = find_route_ipv6(NULL, &daddr6->sin6_addr);
 723
 724         if (!rt) {
 725                 pr_info("no route to ipv6 %pI6 port %u\n",
 726                         daddr6->sin6_addr.s6_addr,
 727                         be16_to_cpu(daddr6->sin6_port));
 728                 err = -ENETUNREACH;
 729                 goto err_out;
 730         }
 731
 732         dst = &rt->dst;
 733
 734         n = dst_neigh_lookup(dst, &daddr6->sin6_addr);
 735
 736         if (!n) {
 737                 pr_info("%pI6, port %u, dst no neighbour.\n",
 738                         daddr6->sin6_addr.s6_addr,
 739                         be16_to_cpu(daddr6->sin6_port));
 740                 err = -ENETUNREACH;
 741                 goto rel_rt;
 742         }
 743         ndev = n->dev;
 744
 745         if (!(ndev->flags & IFF_UP) || !netif_carrier_ok(ndev)) {
 746                 pr_info("%s interface not up.\n", ndev->name);
 747                 err = -ENETDOWN;
 748                 goto rel_rt;
 749         }
 750
 751         if (ipv6_addr_is_multicast(&daddr6->sin6_addr)) {
 752                 pr_info("multi-cast route %pI6 port %u, dev %s.\n",
 753                         daddr6->sin6_addr.s6_addr,
 754                         ntohs(daddr6->sin6_port), ndev->name);
 755                 err = -ENETUNREACH;
 756                 goto rel_rt;
 757         }
 758
 759         cdev = cxgbi_device_find_by_netdev(ndev, &port);
 760         if (!cdev)
 761                 cdev = cxgbi_device_find_by_mac(ndev, &port);
 762         if (!cdev) {
 763                 pr_info("dst %pI6 %s, NOT cxgbi device.\n",
 764                         daddr6->sin6_addr.s6_addr, ndev->name);
 765                 err = -ENETUNREACH;
 766                 goto rel_rt;
 767         }
 768         log_debug(1 << CXGBI_DBG_SOCK,
 769                   "route to %pI6 :%u, ndev p#%d,%s, cdev 0x%p.\n",
 770                   daddr6->sin6_addr.s6_addr, ntohs(daddr6->sin6_port), port,
 771                   ndev->name, cdev);
 772
 773         csk = cxgbi_sock_create(cdev);
 774         if (!csk) {
 775                 err = -ENOMEM;
 776                 goto rel_rt;
 777         }
 778         csk->cdev = cdev;
 779         csk->port_id = port;
 780         csk->mtu = mtu;
 781         csk->dst = dst;
 782
 783         if (ipv6_addr_any(&rt->rt6i_prefsrc.addr)) {
 784                 struct inet6_dev *idev = ip6_dst_idev((struct dst_entry *)rt);
 785
 786                 err = ipv6_dev_get_saddr(&init_net, idev ? idev->dev : NULL,
 787                                          &daddr6->sin6_addr, 0, &pref_saddr);
 788                 if (err) {
 789                         pr_info("failed to get source address to reach %pI6\n",
 790                                 &daddr6->sin6_addr);
 791                         goto rel_rt;
 792                 }
 793         } else {
 794                 pref_saddr = rt->rt6i_prefsrc.addr;
 795         }
 796
 797         csk->csk_family = AF_INET6;
 798         csk->daddr6.sin6_addr = daddr6->sin6_addr;
 799         csk->daddr6.sin6_port = daddr6->sin6_port;
 800         csk->daddr6.sin6_family = daddr6->sin6_family;
 801         csk->saddr6.sin6_family = daddr6->sin6_family;
 802         csk->saddr6.sin6_addr = pref_saddr;
 803
 804         neigh_release(n);
 805         return csk;
 806
 807 rel_rt:
 808         if (n)
 809                 neigh_release(n);
 810
 811         ip6_rt_put(rt);
 812         if (csk)
 813                 cxgbi_sock_closed(csk);
 814 err_out:
 815         return ERR_PTR(err);
 816 }
 817 #endif /* IS_ENABLED(CONFIG_IPV6) */
 818
 819 void cxgbi_sock_established(struct cxgbi_sock *csk, unsigned int snd_isn,
 820                         unsigned int opt)
 821 {
 822         csk->write_seq = csk->snd_nxt = csk->snd_una = snd_isn;
 823         dst_confirm(csk->dst);
 824         smp_mb();
 825         cxgbi_sock_set_state(csk, CTP_ESTABLISHED);
 826 }
 827 EXPORT_SYMBOL_GPL(cxgbi_sock_established);
 828
 829 static void cxgbi_inform_iscsi_conn_closing(struct cxgbi_sock *csk)
 830 {
 831         log_debug(1 << CXGBI_DBG_SOCK,
 832                 "csk 0x%p, state %u, flags 0x%lx, conn 0x%p.\n",
 833                 csk, csk->state, csk->flags, csk->user_data);
 834
 835         if (csk->state != CTP_ESTABLISHED) {
 836                 read_lock_bh(&csk->callback_lock);
 837                 if (csk->user_data)
 838                         iscsi_conn_failure(csk->user_data,
 839                                         ISCSI_ERR_TCP_CONN_CLOSE);
 840                 read_unlock_bh(&csk->callback_lock);
 841         }
 842 }
 843
 844 void cxgbi_sock_closed(struct cxgbi_sock *csk)
 845 {
 846         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 847                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 848         cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
 849         if (csk->state == CTP_ACTIVE_OPEN || csk->state == CTP_CLOSED)
 850                 return;
 851         if (csk->saddr.sin_port)
 852                 sock_put_port(csk);
 853         if (csk->dst)
 854                 dst_release(csk->dst);
 855         csk->cdev->csk_release_offload_resources(csk);
 856         cxgbi_sock_set_state(csk, CTP_CLOSED);
 857         cxgbi_inform_iscsi_conn_closing(csk);
 858         cxgbi_sock_put(csk);
 859 }
 860 EXPORT_SYMBOL_GPL(cxgbi_sock_closed);
 861
 862 static void need_active_close(struct cxgbi_sock *csk)
 863 {
 864         int data_lost;
 865         int close_req = 0;
 866
 867         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 868                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 869         spin_lock_bh(&csk->lock);
 870         if (csk->dst)
 871                 dst_confirm(csk->dst);
 872         data_lost = skb_queue_len(&csk->receive_queue);
 873         __skb_queue_purge(&csk->receive_queue);
 874
 875         if (csk->state == CTP_ACTIVE_OPEN)
 876                 cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
 877         else if (csk->state == CTP_ESTABLISHED) {
 878                 close_req = 1;
 879                 cxgbi_sock_set_state(csk, CTP_ACTIVE_CLOSE);
 880         } else if (csk->state == CTP_PASSIVE_CLOSE) {
 881                 close_req = 1;
 882                 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
 883         }
 884
 885         if (close_req) {
 886                 if (!cxgbi_sock_flag(csk, CTPF_LOGOUT_RSP_RCVD) ||
 887                     data_lost)
 888                         csk->cdev->csk_send_abort_req(csk);
 889                 else
 890                         csk->cdev->csk_send_close_req(csk);
 891         }
 892
 893         spin_unlock_bh(&csk->lock);
 894 }
 895
 896 void cxgbi_sock_fail_act_open(struct cxgbi_sock *csk, int errno)
 897 {
 898         pr_info("csk 0x%p,%u,%lx, %pI4:%u-%pI4:%u, err %d.\n",
 899                         csk, csk->state, csk->flags,
 900                         &csk->saddr.sin_addr.s_addr, csk->saddr.sin_port,
 901                         &csk->daddr.sin_addr.s_addr, csk->daddr.sin_port,
 902                         errno);
 903
 904         cxgbi_sock_set_state(csk, CTP_CONNECTING);
 905         csk->err = errno;
 906         cxgbi_sock_closed(csk);
 907 }
 908 EXPORT_SYMBOL_GPL(cxgbi_sock_fail_act_open);
 909
 910 void cxgbi_sock_act_open_req_arp_failure(void *handle, struct sk_buff *skb)
 911 {
 912         struct cxgbi_sock *csk = (struct cxgbi_sock *)skb->sk;
 913         struct module *owner = csk->cdev->owner;
 914
 915         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 916                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 917         cxgbi_sock_get(csk);
 918         spin_lock_bh(&csk->lock);
 919         if (csk->state == CTP_ACTIVE_OPEN)
 920                 cxgbi_sock_fail_act_open(csk, -EHOSTUNREACH);
 921         spin_unlock_bh(&csk->lock);
 922         cxgbi_sock_put(csk);
 923         __kfree_skb(skb);
 924
 925         module_put(owner);
 926 }
 927 EXPORT_SYMBOL_GPL(cxgbi_sock_act_open_req_arp_failure);
 928
 929 void cxgbi_sock_rcv_abort_rpl(struct cxgbi_sock *csk)
 930 {
 931         cxgbi_sock_get(csk);
 932         spin_lock_bh(&csk->lock);
 933
 934         cxgbi_sock_set_flag(csk, CTPF_ABORT_RPL_RCVD);
 935         if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING)) {
 936                 cxgbi_sock_clear_flag(csk, CTPF_ABORT_RPL_PENDING);
 937                 if (cxgbi_sock_flag(csk, CTPF_ABORT_REQ_RCVD))
 938                         pr_err("csk 0x%p,%u,0x%lx,%u,ABT_RPL_RSS.\n",
 939                                csk, csk->state, csk->flags, csk->tid);
 940                 cxgbi_sock_closed(csk);
 941         }
 942
 943         spin_unlock_bh(&csk->lock);
 944         cxgbi_sock_put(csk);
 945 }
 946 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_abort_rpl);
 947
 948 void cxgbi_sock_rcv_peer_close(struct cxgbi_sock *csk)
 949 {
 950         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 951                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 952         cxgbi_sock_get(csk);
 953         spin_lock_bh(&csk->lock);
 954
 955         if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
 956                 goto done;
 957
 958         switch (csk->state) {
 959         case CTP_ESTABLISHED:
 960                 cxgbi_sock_set_state(csk, CTP_PASSIVE_CLOSE);
 961                 break;
 962         case CTP_ACTIVE_CLOSE:
 963                 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
 964                 break;
 965         case CTP_CLOSE_WAIT_1:
 966                 cxgbi_sock_closed(csk);
 967                 break;
 968         case CTP_ABORTING:
 969                 break;
 970         default:
 971                 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
 972                         csk, csk->state, csk->flags, csk->tid);
 973         }
 974         cxgbi_inform_iscsi_conn_closing(csk);
 975 done:
 976         spin_unlock_bh(&csk->lock);
 977         cxgbi_sock_put(csk);
 978 }
 979 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_peer_close);
 980
 981 void cxgbi_sock_rcv_close_conn_rpl(struct cxgbi_sock *csk, u32 snd_nxt)
 982 {
 983         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 984                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 985         cxgbi_sock_get(csk);
 986         spin_lock_bh(&csk->lock);
 987
 988         csk->snd_una = snd_nxt - 1;
 989         if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
 990                 goto done;
 991
 992         switch (csk->state) {
 993         case CTP_ACTIVE_CLOSE:
 994                 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_1);
 995                 break;
 996         case CTP_CLOSE_WAIT_1:
 997         case CTP_CLOSE_WAIT_2:
 998                 cxgbi_sock_closed(csk);
 999                 break;
1000         case CTP_ABORTING:
1001                 break;
1002         default:
1003                 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
1004                         csk, csk->state, csk->flags, csk->tid);
1005         }
1006 done:
1007         spin_unlock_bh(&csk->lock);
1008         cxgbi_sock_put(csk);
1009 }
1010 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_close_conn_rpl);
1011
1012 void cxgbi_sock_rcv_wr_ack(struct cxgbi_sock *csk, unsigned int credits,
1013                            unsigned int snd_una, int seq_chk)
1014 {
1015         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1016                         "csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, snd_una %u,%d.\n",
1017                         csk, csk->state, csk->flags, csk->tid, credits,
1018                         csk->wr_cred, csk->wr_una_cred, snd_una, seq_chk);
1019
1020         spin_lock_bh(&csk->lock);
1021
1022         csk->wr_cred += credits;
1023         if (csk->wr_una_cred > csk->wr_max_cred - csk->wr_cred)
1024                 csk->wr_una_cred = csk->wr_max_cred - csk->wr_cred;
1025
1026         while (credits) {
1027                 struct sk_buff *p = cxgbi_sock_peek_wr(csk);
1028
1029                 if (unlikely(!p)) {
1030                         pr_err("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, empty.\n",
1031                                 csk, csk->state, csk->flags, csk->tid, credits,
1032                                 csk->wr_cred, csk->wr_una_cred);
1033                         break;
1034                 }
1035
1036                 if (unlikely(credits < p->csum)) {
1037                         pr_warn("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, < %u.\n",
1038                                 csk, csk->state, csk->flags, csk->tid,
1039                                 credits, csk->wr_cred, csk->wr_una_cred,
1040                                 p->csum);
1041                         p->csum -= credits;
1042                         break;
1043                 } else {
1044                         cxgbi_sock_dequeue_wr(csk);
1045                         credits -= p->csum;
1046                         kfree_skb(p);
1047                 }
1048         }
1049
1050         cxgbi_sock_check_wr_invariants(csk);
1051
1052         if (seq_chk) {
1053                 if (unlikely(before(snd_una, csk->snd_una))) {
1054                         pr_warn("csk 0x%p,%u,0x%lx,%u, snd_una %u/%u.",
1055                                 csk, csk->state, csk->flags, csk->tid, snd_una,
1056                                 csk->snd_una);
1057                         goto done;
1058                 }
1059
1060                 if (csk->snd_una != snd_una) {
1061                         csk->snd_una = snd_una;
1062                         dst_confirm(csk->dst);
1063                 }
1064         }
1065
1066         if (skb_queue_len(&csk->write_queue)) {
1067                 if (csk->cdev->csk_push_tx_frames(csk, 0))
1068                         cxgbi_conn_tx_open(csk);
1069         } else
1070                 cxgbi_conn_tx_open(csk);
1071 done:
1072         spin_unlock_bh(&csk->lock);
1073 }
1074 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_wr_ack);
1075
1076 static unsigned int cxgbi_sock_find_best_mtu(struct cxgbi_sock *csk,
1077                                              unsigned short mtu)
1078 {
1079         int i = 0;
1080
1081         while (i < csk->cdev->nmtus - 1 && csk->cdev->mtus[i + 1] <= mtu)
1082                 ++i;
1083
1084         return i;
1085 }
1086
1087 unsigned int cxgbi_sock_select_mss(struct cxgbi_sock *csk, unsigned int pmtu)
1088 {
1089         unsigned int idx;
1090         struct dst_entry *dst = csk->dst;
1091
1092         csk->advmss = dst_metric_advmss(dst);
1093
1094         if (csk->advmss > pmtu - 40)
1095                 csk->advmss = pmtu - 40;
1096         if (csk->advmss < csk->cdev->mtus[0] - 40)
1097                 csk->advmss = csk->cdev->mtus[0] - 40;
1098         idx = cxgbi_sock_find_best_mtu(csk, csk->advmss + 40);
1099
1100         return idx;
1101 }
1102 EXPORT_SYMBOL_GPL(cxgbi_sock_select_mss);
1103
1104 void cxgbi_sock_skb_entail(struct cxgbi_sock *csk, struct sk_buff *skb)
1105 {
1106         cxgbi_skcb_tcp_seq(skb) = csk->write_seq;
1107         __skb_queue_tail(&csk->write_queue, skb);
1108 }
1109 EXPORT_SYMBOL_GPL(cxgbi_sock_skb_entail);
1110
1111 void cxgbi_sock_purge_wr_queue(struct cxgbi_sock *csk)
1112 {
1113         struct sk_buff *skb;
1114
1115         while ((skb = cxgbi_sock_dequeue_wr(csk)) != NULL)
1116                 kfree_skb(skb);
1117 }
1118 EXPORT_SYMBOL_GPL(cxgbi_sock_purge_wr_queue);
1119
1120 void cxgbi_sock_check_wr_invariants(const struct cxgbi_sock *csk)
1121 {
1122         int pending = cxgbi_sock_count_pending_wrs(csk);
1123
1124         if (unlikely(csk->wr_cred + pending != csk->wr_max_cred))
1125                 pr_err("csk 0x%p, tid %u, credit %u + %u != %u.\n",
1126                         csk, csk->tid, csk->wr_cred, pending, csk->wr_max_cred);
1127 }
1128 EXPORT_SYMBOL_GPL(cxgbi_sock_check_wr_invariants);
1129
1130 static int cxgbi_sock_send_pdus(struct cxgbi_sock *csk, struct sk_buff *skb)
1131 {
1132         struct cxgbi_device *cdev = csk->cdev;
1133         struct sk_buff *next;
1134         int err, copied = 0;
1135
1136         spin_lock_bh(&csk->lock);
1137
1138         if (csk->state != CTP_ESTABLISHED) {
1139                 log_debug(1 << CXGBI_DBG_PDU_TX,
1140                         "csk 0x%p,%u,0x%lx,%u, EAGAIN.\n",
1141                         csk, csk->state, csk->flags, csk->tid);
1142                 err = -EAGAIN;
1143                 goto out_err;
1144         }
1145
1146         if (csk->err) {
1147                 log_debug(1 << CXGBI_DBG_PDU_TX,
1148                         "csk 0x%p,%u,0x%lx,%u, EPIPE %d.\n",
1149                         csk, csk->state, csk->flags, csk->tid, csk->err);
1150                 err = -EPIPE;
1151                 goto out_err;
1152         }
1153
1154         if (csk->write_seq - csk->snd_una >= csk->snd_win) {
1155                 log_debug(1 << CXGBI_DBG_PDU_TX,
1156                         "csk 0x%p,%u,0x%lx,%u, FULL %u-%u >= %u.\n",
1157                         csk, csk->state, csk->flags, csk->tid, csk->write_seq,
1158                         csk->snd_una, csk->snd_win);
1159                 err = -ENOBUFS;
1160                 goto out_err;
1161         }
1162
1163         while (skb) {
1164                 int frags = skb_shinfo(skb)->nr_frags +
1165                                 (skb->len != skb->data_len);
1166
1167                 if (unlikely(skb_headroom(skb) < cdev->skb_tx_rsvd)) {
1168                         pr_err("csk 0x%p, skb head %u < %u.\n",
1169                                 csk, skb_headroom(skb), cdev->skb_tx_rsvd);
1170                         err = -EINVAL;
1171                         goto out_err;
1172                 }
1173
1174                 if (frags >= SKB_WR_LIST_SIZE) {
1175                         pr_err("csk 0x%p, frags %d, %u,%u >%u.\n",
1176                                 csk, skb_shinfo(skb)->nr_frags, skb->len,
1177                                 skb->data_len, (uint)(SKB_WR_LIST_SIZE));
1178                         err = -EINVAL;
1179                         goto out_err;
1180                 }
1181
1182                 next = skb->next;
1183                 skb->next = NULL;
1184                 cxgbi_skcb_set_flag(skb, SKCBF_TX_NEED_HDR);
1185                 cxgbi_sock_skb_entail(csk, skb);
1186                 copied += skb->len;
1187                 csk->write_seq += skb->len +
1188                                 cxgbi_ulp_extra_len(cxgbi_skcb_ulp_mode(skb));
1189                 skb = next;
1190         }
1191
1192         if (likely(skb_queue_len(&csk->write_queue)))
1193                 cdev->csk_push_tx_frames(csk, 1);
1194 done:
1195         spin_unlock_bh(&csk->lock);
1196         return copied;
1197
1198 out_err:
1199         if (copied == 0 && err == -EPIPE)
1200                 copied = csk->err ? csk->err : -EPIPE;
1201         else
1202                 copied = err;
1203         goto done;
1204 }
1205
1206 static inline void
1207 scmd_get_params(struct scsi_cmnd *sc, struct scatterlist **sgl,
1208                 unsigned int *sgcnt, unsigned int *dlen,
1209                 unsigned int prot)
1210 {
1211         struct scsi_data_buffer *sdb = prot ? scsi_prot(sc) : scsi_out(sc);
1212
1213         *sgl = sdb->table.sgl;
1214         *sgcnt = sdb->table.nents;
1215         *dlen = sdb->length;
1216         /* Caution: for protection sdb, sdb->length is invalid */
1217 }
1218
1219 void cxgbi_ddp_set_one_ppod(struct cxgbi_pagepod *ppod,
1220                             struct cxgbi_task_tag_info *ttinfo,
1221                             struct scatterlist **sg_pp, unsigned int *sg_off)
1222 {
1223         struct scatterlist *sg = sg_pp ? *sg_pp : NULL;
1224         unsigned int offset = sg_off ? *sg_off : 0;
1225         dma_addr_t addr = 0UL;
1226         unsigned int len = 0;
1227         int i;
1228
1229         memcpy(ppod, &ttinfo->hdr, sizeof(struct cxgbi_pagepod_hdr));
1230
1231         if (sg) {
1232                 addr = sg_dma_address(sg);
1233                 len = sg_dma_len(sg);
1234         }
1235
1236         for (i = 0; i < PPOD_PAGES_MAX; i++) {
1237                 if (sg) {
1238                         ppod->addr[i] = cpu_to_be64(addr + offset);
1239                         offset += PAGE_SIZE;
1240                         if (offset == (len + sg->offset)) {
1241                                 offset = 0;
1242                                 sg = sg_next(sg);
1243                                 if (sg) {
1244                                         addr = sg_dma_address(sg);
1245                                         len = sg_dma_len(sg);
1246                                 }
1247                         }
1248                 } else {
1249                         ppod->addr[i] = 0ULL;
1250                 }
1251         }
1252
1253         /*
1254          * the fifth address needs to be repeated in the next ppod, so do
1255          * not move sg
1256          */
1257         if (sg_pp) {
1258                 *sg_pp = sg;
1259                 *sg_off = offset;
1260         }
1261
1262         if (offset == len) {
1263                 offset = 0;
1264                 sg = sg_next(sg);
1265                 if (sg) {
1266                         addr = sg_dma_address(sg);
1267                         len = sg_dma_len(sg);
1268                 }
1269         }
1270         ppod->addr[i] = sg ? cpu_to_be64(addr + offset) : 0ULL;
1271 }
1272 EXPORT_SYMBOL_GPL(cxgbi_ddp_set_one_ppod);
1273
1274 /*
1275  * APIs interacting with open-iscsi libraries
1276  */
1277
1278 static unsigned char padding[4];
1279
1280 void cxgbi_ddp_ppm_setup(void **ppm_pp, struct cxgbi_device *cdev,
1281                          struct cxgbi_tag_format *tformat, unsigned int ppmax,
1282                          unsigned int llimit, unsigned int start,
1283                          unsigned int rsvd_factor)
1284 {
1285         int err = cxgbi_ppm_init(ppm_pp, cdev->ports[0], cdev->pdev,
1286                                 cdev->lldev, tformat, ppmax, llimit, start,
1287                                 rsvd_factor);
1288
1289         if (err >= 0) {
1290                 struct cxgbi_ppm *ppm = (struct cxgbi_ppm *)(*ppm_pp);
1291
1292                 if (ppm->ppmax < 1024 ||
1293                     ppm->tformat.pgsz_idx_dflt >= DDP_PGIDX_MAX)
1294                         cdev->flags |= CXGBI_FLAG_DDP_OFF;
1295                 err = 0;
1296         } else {
1297                 cdev->flags |= CXGBI_FLAG_DDP_OFF;
1298         }
1299 }
1300 EXPORT_SYMBOL_GPL(cxgbi_ddp_ppm_setup);
1301
1302 static int cxgbi_ddp_sgl_check(struct scatterlist *sgl, int nents)
1303 {
1304         int i;
1305         int last_sgidx = nents - 1;
1306         struct scatterlist *sg = sgl;
1307
1308         for (i = 0; i < nents; i++, sg = sg_next(sg)) {
1309                 unsigned int len = sg->length + sg->offset;
1310
1311                 if ((sg->offset & 0x3) || (i && sg->offset) ||
1312                     ((i != last_sgidx) && len != PAGE_SIZE)) {
1313                         log_debug(1 << CXGBI_DBG_DDP,
1314                                   "sg %u/%u, %u,%u, not aligned.\n",
1315                                   i, nents, sg->offset, sg->length);
1316                         goto err_out;
1317                 }
1318         }
1319         return 0;
1320 err_out:
1321         return -EINVAL;
1322 }
1323
1324 static int cxgbi_ddp_reserve(struct cxgbi_conn *cconn,
1325                              struct cxgbi_task_data *tdata, u32 sw_tag,
1326                              unsigned int xferlen)
1327 {
1328         struct cxgbi_sock *csk = cconn->cep->csk;
1329         struct cxgbi_device *cdev = csk->cdev;
1330         struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
1331         struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
1332         struct scatterlist *sgl = ttinfo->sgl;
1333         unsigned int sgcnt = ttinfo->nents;
1334         unsigned int sg_offset = sgl->offset;
1335         int err;
1336
1337         if (cdev->flags & CXGBI_FLAG_DDP_OFF) {
1338                 log_debug(1 << CXGBI_DBG_DDP,
1339                           "cdev 0x%p DDP off.\n", cdev);
1340                 return -EINVAL;
1341         }
1342
1343         if (!ppm || xferlen < DDP_THRESHOLD || !sgcnt ||
1344             ppm->tformat.pgsz_idx_dflt >= DDP_PGIDX_MAX) {
1345                 log_debug(1 << CXGBI_DBG_DDP,
1346                           "ppm 0x%p, pgidx %u, xfer %u, sgcnt %u, NO ddp.\n",
1347                           ppm, ppm ? ppm->tformat.pgsz_idx_dflt : DDP_PGIDX_MAX,
1348                           xferlen, ttinfo->nents);
1349                 return -EINVAL;
1350         }
1351
1352         /* make sure the buffer is suitable for ddp */
1353         if (cxgbi_ddp_sgl_check(sgl, sgcnt) < 0)
1354                 return -EINVAL;
1355
1356         ttinfo->nr_pages = (xferlen + sgl->offset + (1 << PAGE_SHIFT) - 1) >>
1357                             PAGE_SHIFT;
1358
1359         /*
1360          * the ddp tag will be used for the itt in the outgoing pdu,
1361          * the itt genrated by libiscsi is saved in the ppm and can be
1362          * retrieved via the ddp tag
1363          */
1364         err = cxgbi_ppm_ppods_reserve(ppm, ttinfo->nr_pages, 0, &ttinfo->idx,
1365                                       &ttinfo->tag, (unsigned long)sw_tag);
1366         if (err < 0) {
1367                 cconn->ddp_full++;
1368                 return err;
1369         }
1370         ttinfo->npods = err;
1371
1372          /* setup dma from scsi command sgl */
1373         sgl->offset = 0;
1374         err = dma_map_sg(&ppm->pdev->dev, sgl, sgcnt, DMA_FROM_DEVICE);
1375         sgl->offset = sg_offset;
1376         if (err == 0) {
1377                 pr_info("%s: 0x%x, xfer %u, sgl %u dma mapping err.\n",
1378                         __func__, sw_tag, xferlen, sgcnt);
1379                 goto rel_ppods;
1380         }
1381         if (err != ttinfo->nr_pages) {
1382                 log_debug(1 << CXGBI_DBG_DDP,
1383                           "%s: sw tag 0x%x, xfer %u, sgl %u, dma count %d.\n",
1384                           __func__, sw_tag, xferlen, sgcnt, err);
1385         }
1386
1387         ttinfo->flags |= CXGBI_PPOD_INFO_FLAG_MAPPED;
1388         ttinfo->cid = csk->port_id;
1389
1390         cxgbi_ppm_make_ppod_hdr(ppm, ttinfo->tag, csk->tid, sgl->offset,
1391                                 xferlen, &ttinfo->hdr);
1392
1393         if (cdev->flags & CXGBI_FLAG_USE_PPOD_OFLDQ) {
1394                 /* write ppod from xmit_pdu (of iscsi_scsi_command pdu) */
1395                 ttinfo->flags |= CXGBI_PPOD_INFO_FLAG_VALID;
1396         } else {
1397                 /* write ppod from control queue now */
1398                 err = cdev->csk_ddp_set_map(ppm, csk, ttinfo);
1399                 if (err < 0)
1400                         goto rel_ppods;
1401         }
1402
1403         return 0;
1404
1405 rel_ppods:
1406         cxgbi_ppm_ppod_release(ppm, ttinfo->idx);
1407
1408         if (ttinfo->flags & CXGBI_PPOD_INFO_FLAG_MAPPED) {
1409                 ttinfo->flags &= ~CXGBI_PPOD_INFO_FLAG_MAPPED;
1410                 dma_unmap_sg(&ppm->pdev->dev, sgl, sgcnt, DMA_FROM_DEVICE);
1411         }
1412         return -EINVAL;
1413 }
1414
1415 static void task_release_itt(struct iscsi_task *task, itt_t hdr_itt)
1416 {
1417         struct scsi_cmnd *sc = task->sc;
1418         struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
1419         struct cxgbi_conn *cconn = tcp_conn->dd_data;
1420         struct cxgbi_device *cdev = cconn->chba->cdev;
1421         struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
1422         u32 tag = ntohl((__force u32)hdr_itt);
1423
1424         log_debug(1 << CXGBI_DBG_DDP,
1425                   "cdev 0x%p, task 0x%p, release tag 0x%x.\n",
1426                   cdev, task, tag);
1427         if (sc &&
1428             (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE) &&
1429             cxgbi_ppm_is_ddp_tag(ppm, tag)) {
1430                 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1431                 struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
1432
1433                 if (!(cdev->flags & CXGBI_FLAG_USE_PPOD_OFLDQ))
1434                         cdev->csk_ddp_clear_map(cdev, ppm, ttinfo);
1435                 cxgbi_ppm_ppod_release(ppm, ttinfo->idx);
1436                 dma_unmap_sg(&ppm->pdev->dev, ttinfo->sgl, ttinfo->nents,
1437                              DMA_FROM_DEVICE);
1438         }
1439 }
1440
1441 static inline u32 cxgbi_build_sw_tag(u32 idx, u32 age)
1442 {
1443         /* assume idx and age both are < 0x7FFF (32767) */
1444         return (idx << 16) | age;
1445 }
1446
1447 static int task_reserve_itt(struct iscsi_task *task, itt_t *hdr_itt)
1448 {
1449         struct scsi_cmnd *sc = task->sc;
1450         struct iscsi_conn *conn = task->conn;
1451         struct iscsi_session *sess = conn->session;
1452         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1453         struct cxgbi_conn *cconn = tcp_conn->dd_data;
1454         struct cxgbi_device *cdev = cconn->chba->cdev;
1455         struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
1456         u32 sw_tag = cxgbi_build_sw_tag(task->itt, sess->age);
1457         u32 tag = 0;
1458         int err = -EINVAL;
1459
1460         if (sc &&
1461             (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE)
1462         ) {
1463                 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1464                 struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
1465
1466                 scmd_get_params(sc, &ttinfo->sgl, &ttinfo->nents,
1467                                 &tdata->dlen, 0);
1468                 err = cxgbi_ddp_reserve(cconn, tdata, sw_tag, tdata->dlen);
1469                 if (!err)
1470                         tag = ttinfo->tag;
1471                 else
1472                          log_debug(1 << CXGBI_DBG_DDP,
1473                                    "csk 0x%p, R task 0x%p, %u,%u, no ddp.\n",
1474                                    cconn->cep->csk, task, tdata->dlen,
1475                                    ttinfo->nents);
1476         }
1477
1478         if (err < 0) {
1479                 err = cxgbi_ppm_make_non_ddp_tag(ppm, sw_tag, &tag);
1480                 if (err < 0)
1481                         return err;
1482         }
1483         /*  the itt need to sent in big-endian order */
1484         *hdr_itt = (__force itt_t)htonl(tag);
1485
1486         log_debug(1 << CXGBI_DBG_DDP,
1487                   "cdev 0x%p, task 0x%p, 0x%x(0x%x,0x%x)->0x%x/0x%x.\n",
1488                   cdev, task, sw_tag, task->itt, sess->age, tag, *hdr_itt);
1489         return 0;
1490 }
1491
1492 void cxgbi_parse_pdu_itt(struct iscsi_conn *conn, itt_t itt, int *idx, int *age)
1493 {
1494         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1495         struct cxgbi_conn *cconn = tcp_conn->dd_data;
1496         struct cxgbi_device *cdev = cconn->chba->cdev;
1497         struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
1498         u32 tag = ntohl((__force u32)itt);
1499         u32 sw_bits;
1500
1501         if (ppm) {
1502                 if (cxgbi_ppm_is_ddp_tag(ppm, tag))
1503                         sw_bits = cxgbi_ppm_get_tag_caller_data(ppm, tag);
1504                 else
1505                         sw_bits = cxgbi_ppm_decode_non_ddp_tag(ppm, tag);
1506         } else {
1507                 sw_bits = tag;
1508         }
1509
1510         cxgbi_decode_sw_tag(sw_bits, idx, age);
1511         log_debug(1 << CXGBI_DBG_DDP,
1512                   "cdev 0x%p, tag 0x%x/0x%x, -> 0x%x(0x%x,0x%x).\n",
1513                   cdev, tag, itt, sw_bits, idx ? *idx : 0xFFFFF,
1514                   age ? *age : 0xFF);
1515 }
1516 EXPORT_SYMBOL_GPL(cxgbi_parse_pdu_itt);
1517
1518 void cxgbi_conn_tx_open(struct cxgbi_sock *csk)
1519 {
1520         struct iscsi_conn *conn = csk->user_data;
1521
1522         if (conn) {
1523                 log_debug(1 << CXGBI_DBG_SOCK,
1524                         "csk 0x%p, cid %d.\n", csk, conn->id);
1525                 iscsi_conn_queue_work(conn);
1526         }
1527 }
1528 EXPORT_SYMBOL_GPL(cxgbi_conn_tx_open);
1529
1530 /*
1531  * pdu receive, interact with libiscsi_tcp
1532  */
1533 static inline int read_pdu_skb(struct iscsi_conn *conn,
1534                                struct sk_buff *skb,
1535                                unsigned int offset,
1536                                int offloaded)
1537 {
1538         int status = 0;
1539         int bytes_read;
1540
1541         bytes_read = iscsi_tcp_recv_skb(conn, skb, offset, offloaded, &status);
1542         switch (status) {
1543         case ISCSI_TCP_CONN_ERR:
1544                 pr_info("skb 0x%p, off %u, %d, TCP_ERR.\n",
1545                           skb, offset, offloaded);
1546                 return -EIO;
1547         case ISCSI_TCP_SUSPENDED:
1548                 log_debug(1 << CXGBI_DBG_PDU_RX,
1549                         "skb 0x%p, off %u, %d, TCP_SUSPEND, rc %d.\n",
1550                         skb, offset, offloaded, bytes_read);
1551                 /* no transfer - just have caller flush queue */
1552                 return bytes_read;
1553         case ISCSI_TCP_SKB_DONE:
1554                 pr_info("skb 0x%p, off %u, %d, TCP_SKB_DONE.\n",
1555                         skb, offset, offloaded);
1556                 /*
1557                  * pdus should always fit in the skb and we should get
1558                  * segment done notifcation.
1559                  */
1560                 iscsi_conn_printk(KERN_ERR, conn, "Invalid pdu or skb.");
1561                 return -EFAULT;
1562         case ISCSI_TCP_SEGMENT_DONE:
1563                 log_debug(1 << CXGBI_DBG_PDU_RX,
1564                         "skb 0x%p, off %u, %d, TCP_SEG_DONE, rc %d.\n",
1565                         skb, offset, offloaded, bytes_read);
1566                 return bytes_read;
1567         default:
1568                 pr_info("skb 0x%p, off %u, %d, invalid status %d.\n",
1569                         skb, offset, offloaded, status);
1570                 return -EINVAL;
1571         }
1572 }
1573
1574 static int
1575 skb_read_pdu_bhs(struct cxgbi_sock *csk, struct iscsi_conn *conn,
1576                  struct sk_buff *skb)
1577 {
1578         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1579         int err;
1580
1581         log_debug(1 << CXGBI_DBG_PDU_RX,
1582                 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1583                 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1584
1585         if (!iscsi_tcp_recv_segment_is_hdr(tcp_conn)) {
1586                 pr_info("conn 0x%p, skb 0x%p, not hdr.\n", conn, skb);
1587                 iscsi_conn_failure(conn, ISCSI_ERR_PROTO);
1588                 return -EIO;
1589         }
1590
1591         if (conn->hdrdgst_en &&
1592             cxgbi_skcb_test_flag(skb, SKCBF_RX_HCRC_ERR)) {
1593                 pr_info("conn 0x%p, skb 0x%p, hcrc.\n", conn, skb);
1594                 iscsi_conn_failure(conn, ISCSI_ERR_HDR_DGST);
1595                 return -EIO;
1596         }
1597
1598         if (cxgbi_skcb_test_flag(skb, SKCBF_RX_ISCSI_COMPL) &&
1599             cxgbi_skcb_test_flag(skb, SKCBF_RX_DATA_DDPD)) {
1600                 /* If completion flag is set and data is directly
1601                  * placed in to the host memory then update
1602                  * task->exp_datasn to the datasn in completion
1603                  * iSCSI hdr as T6 adapter generates completion only
1604                  * for the last pdu of a sequence.
1605                  */
1606                 itt_t itt = ((struct iscsi_data *)skb->data)->itt;
1607                 struct iscsi_task *task = iscsi_itt_to_ctask(conn, itt);
1608                 u32 data_sn = be32_to_cpu(((struct iscsi_data *)
1609                                                         skb->data)->datasn);
1610                 if (task && task->sc) {
1611                         struct iscsi_tcp_task *tcp_task = task->dd_data;
1612
1613                         tcp_task->exp_datasn = data_sn;
1614                 }
1615         }
1616
1617         err = read_pdu_skb(conn, skb, 0, 0);
1618         if (likely(err >= 0)) {
1619                 struct iscsi_hdr *hdr = (struct iscsi_hdr *)skb->data;
1620                 u8 opcode = hdr->opcode & ISCSI_OPCODE_MASK;
1621
1622                 if (unlikely(opcode == ISCSI_OP_LOGOUT_RSP))
1623                         cxgbi_sock_set_flag(csk, CTPF_LOGOUT_RSP_RCVD);
1624         }
1625
1626         return err;
1627 }
1628
1629 static int skb_read_pdu_data(struct iscsi_conn *conn, struct sk_buff *lskb,
1630                              struct sk_buff *skb, unsigned int offset)
1631 {
1632         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1633         bool offloaded = 0;
1634         int opcode = tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK;
1635
1636         log_debug(1 << CXGBI_DBG_PDU_RX,
1637                 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1638                 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1639
1640         if (conn->datadgst_en &&
1641             cxgbi_skcb_test_flag(lskb, SKCBF_RX_DCRC_ERR)) {
1642                 pr_info("conn 0x%p, skb 0x%p, dcrc 0x%lx.\n",
1643                         conn, lskb, cxgbi_skcb_flags(lskb));
1644                 iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST);
1645                 return -EIO;
1646         }
1647
1648         if (iscsi_tcp_recv_segment_is_hdr(tcp_conn))
1649                 return 0;
1650
1651         /* coalesced, add header digest length */
1652         if (lskb == skb && conn->hdrdgst_en)
1653                 offset += ISCSI_DIGEST_SIZE;
1654
1655         if (cxgbi_skcb_test_flag(lskb, SKCBF_RX_DATA_DDPD))
1656                 offloaded = 1;
1657
1658         if (opcode == ISCSI_OP_SCSI_DATA_IN)
1659                 log_debug(1 << CXGBI_DBG_PDU_RX,
1660                         "skb 0x%p, op 0x%x, itt 0x%x, %u %s ddp'ed.\n",
1661                         skb, opcode, ntohl(tcp_conn->in.hdr->itt),
1662                         tcp_conn->in.datalen, offloaded ? "is" : "not");
1663
1664         return read_pdu_skb(conn, skb, offset, offloaded);
1665 }
1666
1667 static void csk_return_rx_credits(struct cxgbi_sock *csk, int copied)
1668 {
1669         struct cxgbi_device *cdev = csk->cdev;
1670         int must_send;
1671         u32 credits;
1672
1673         log_debug(1 << CXGBI_DBG_PDU_RX,
1674                 "csk 0x%p,%u,0x%lx,%u, seq %u, wup %u, thre %u, %u.\n",
1675                 csk, csk->state, csk->flags, csk->tid, csk->copied_seq,
1676                 csk->rcv_wup, cdev->rx_credit_thres,
1677                 csk->rcv_win);
1678
1679         if (!cdev->rx_credit_thres)
1680                 return;
1681
1682         if (csk->state != CTP_ESTABLISHED)
1683                 return;
1684
1685         credits = csk->copied_seq - csk->rcv_wup;
1686         if (unlikely(!credits))
1687                 return;
1688         must_send = credits + 16384 >= csk->rcv_win;
1689         if (must_send || credits >= cdev->rx_credit_thres)
1690                 csk->rcv_wup += cdev->csk_send_rx_credits(csk, credits);
1691 }
1692
1693 void cxgbi_conn_pdu_ready(struct cxgbi_sock *csk)
1694 {
1695         struct cxgbi_device *cdev = csk->cdev;
1696         struct iscsi_conn *conn = csk->user_data;
1697         struct sk_buff *skb;
1698         unsigned int read = 0;
1699         int err = 0;
1700
1701         log_debug(1 << CXGBI_DBG_PDU_RX,
1702                 "csk 0x%p, conn 0x%p.\n", csk, conn);
1703
1704         if (unlikely(!conn || conn->suspend_rx)) {
1705                 log_debug(1 << CXGBI_DBG_PDU_RX,
1706                         "csk 0x%p, conn 0x%p, id %d, suspend_rx %lu!\n",
1707                         csk, conn, conn ? conn->id : 0xFF,
1708                         conn ? conn->suspend_rx : 0xFF);
1709                 return;
1710         }
1711
1712         while (!err) {
1713                 skb = skb_peek(&csk->receive_queue);
1714                 if (!skb ||
1715                     !(cxgbi_skcb_test_flag(skb, SKCBF_RX_STATUS))) {
1716                         if (skb)
1717                                 log_debug(1 << CXGBI_DBG_PDU_RX,
1718                                         "skb 0x%p, NOT ready 0x%lx.\n",
1719                                         skb, cxgbi_skcb_flags(skb));
1720                         break;
1721                 }
1722                 __skb_unlink(skb, &csk->receive_queue);
1723
1724                 read += cxgbi_skcb_rx_pdulen(skb);
1725                 log_debug(1 << CXGBI_DBG_PDU_RX,
1726                         "csk 0x%p, skb 0x%p,%u,f 0x%lx, pdu len %u.\n",
1727                         csk, skb, skb->len, cxgbi_skcb_flags(skb),
1728                         cxgbi_skcb_rx_pdulen(skb));
1729
1730                 if (cxgbi_skcb_test_flag(skb, SKCBF_RX_COALESCED)) {
1731                         err = skb_read_pdu_bhs(csk, conn, skb);
1732                         if (err < 0) {
1733                                 pr_err("coalesced bhs, csk 0x%p, skb 0x%p,%u, "
1734                                         "f 0x%lx, plen %u.\n",
1735                                         csk, skb, skb->len,
1736                                         cxgbi_skcb_flags(skb),
1737                                         cxgbi_skcb_rx_pdulen(skb));
1738                                 goto skb_done;
1739                         }
1740                         err = skb_read_pdu_data(conn, skb, skb,
1741                                                 err + cdev->skb_rx_extra);
1742                         if (err < 0)
1743                                 pr_err("coalesced data, csk 0x%p, skb 0x%p,%u, "
1744                                         "f 0x%lx, plen %u.\n",
1745                                         csk, skb, skb->len,
1746                                         cxgbi_skcb_flags(skb),
1747                                         cxgbi_skcb_rx_pdulen(skb));
1748                 } else {
1749                         err = skb_read_pdu_bhs(csk, conn, skb);
1750                         if (err < 0) {
1751                                 pr_err("bhs, csk 0x%p, skb 0x%p,%u, "
1752                                         "f 0x%lx, plen %u.\n",
1753                                         csk, skb, skb->len,
1754                                         cxgbi_skcb_flags(skb),
1755                                         cxgbi_skcb_rx_pdulen(skb));
1756                                 goto skb_done;
1757                         }
1758
1759                         if (cxgbi_skcb_test_flag(skb, SKCBF_RX_DATA)) {
1760                                 struct sk_buff *dskb;
1761
1762                                 dskb = skb_peek(&csk->receive_queue);
1763                                 if (!dskb) {
1764                                         pr_err("csk 0x%p, skb 0x%p,%u, f 0x%lx,"
1765                                                 " plen %u, NO data.\n",
1766                                                 csk, skb, skb->len,
1767                                                 cxgbi_skcb_flags(skb),
1768                                                 cxgbi_skcb_rx_pdulen(skb));
1769                                         err = -EIO;
1770                                         goto skb_done;
1771                                 }
1772                                 __skb_unlink(dskb, &csk->receive_queue);
1773
1774                                 err = skb_read_pdu_data(conn, skb, dskb, 0);
1775                                 if (err < 0)
1776                                         pr_err("data, csk 0x%p, skb 0x%p,%u, "
1777                                                 "f 0x%lx, plen %u, dskb 0x%p,"
1778                                                 "%u.\n",
1779                                                 csk, skb, skb->len,
1780                                                 cxgbi_skcb_flags(skb),
1781                                                 cxgbi_skcb_rx_pdulen(skb),
1782                                                 dskb, dskb->len);
1783                                 __kfree_skb(dskb);
1784                         } else
1785                                 err = skb_read_pdu_data(conn, skb, skb, 0);
1786                 }
1787 skb_done:
1788                 __kfree_skb(skb);
1789
1790                 if (err < 0)
1791                         break;
1792         }
1793
1794         log_debug(1 << CXGBI_DBG_PDU_RX, "csk 0x%p, read %u.\n", csk, read);
1795         if (read) {
1796                 csk->copied_seq += read;
1797                 csk_return_rx_credits(csk, read);
1798                 conn->rxdata_octets += read;
1799         }
1800
1801         if (err < 0) {
1802                 pr_info("csk 0x%p, 0x%p, rx failed %d, read %u.\n",
1803                         csk, conn, err, read);
1804                 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1805         }
1806 }
1807 EXPORT_SYMBOL_GPL(cxgbi_conn_pdu_ready);
1808
1809 static int sgl_seek_offset(struct scatterlist *sgl, unsigned int sgcnt,
1810                                 unsigned int offset, unsigned int *off,
1811                                 struct scatterlist **sgp)
1812 {
1813         int i;
1814         struct scatterlist *sg;
1815
1816         for_each_sg(sgl, sg, sgcnt, i) {
1817                 if (offset < sg->length) {
1818                         *off = offset;
1819                         *sgp = sg;
1820                         return 0;
1821                 }
1822                 offset -= sg->length;
1823         }
1824         return -EFAULT;
1825 }
1826
1827 static int sgl_read_to_frags(struct scatterlist *sg, unsigned int sgoffset,
1828                                 unsigned int dlen, struct page_frag *frags,
1829                                 int frag_max)
1830 {
1831         unsigned int datalen = dlen;
1832         unsigned int sglen = sg->length - sgoffset;
1833         struct page *page = sg_page(sg);
1834         int i;
1835
1836         i = 0;
1837         do {
1838                 unsigned int copy;
1839
1840                 if (!sglen) {
1841                         sg = sg_next(sg);
1842                         if (!sg) {
1843                                 pr_warn("sg %d NULL, len %u/%u.\n",
1844                                         i, datalen, dlen);
1845                                 return -EINVAL;
1846                         }
1847                         sgoffset = 0;
1848                         sglen = sg->length;
1849                         page = sg_page(sg);
1850
1851                 }
1852                 copy = min(datalen, sglen);
1853                 if (i && page == frags[i - 1].page &&
1854                     sgoffset + sg->offset ==
1855                         frags[i - 1].offset + frags[i - 1].size) {
1856                         frags[i - 1].size += copy;
1857                 } else {
1858                         if (i >= frag_max) {
1859                                 pr_warn("too many pages %u, dlen %u.\n",
1860                                         frag_max, dlen);
1861                                 return -EINVAL;
1862                         }
1863
1864                         frags[i].page = page;
1865                         frags[i].offset = sg->offset + sgoffset;
1866                         frags[i].size = copy;
1867                         i++;
1868                 }
1869                 datalen -= copy;
1870                 sgoffset += copy;
1871                 sglen -= copy;
1872         } while (datalen);
1873
1874         return i;
1875 }
1876
1877 int cxgbi_conn_alloc_pdu(struct iscsi_task *task, u8 opcode)
1878 {
1879         struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
1880         struct cxgbi_conn *cconn = tcp_conn->dd_data;
1881         struct cxgbi_device *cdev = cconn->chba->cdev;
1882         struct iscsi_conn *conn = task->conn;
1883         struct iscsi_tcp_task *tcp_task = task->dd_data;
1884         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1885         struct scsi_cmnd *sc = task->sc;
1886         int headroom = SKB_TX_ISCSI_PDU_HEADER_MAX;
1887
1888         tcp_task->dd_data = tdata;
1889         task->hdr = NULL;
1890
1891         if (tdata->skb) {
1892                 kfree_skb(tdata->skb);
1893                 tdata->skb = NULL;
1894         }
1895
1896         if (SKB_MAX_HEAD(cdev->skb_tx_rsvd) > (512 * MAX_SKB_FRAGS) &&
1897             (opcode == ISCSI_OP_SCSI_DATA_OUT ||
1898              (opcode == ISCSI_OP_SCSI_CMD &&
1899               (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_TO_DEVICE))))
1900                 /* data could goes into skb head */
1901                 headroom += min_t(unsigned int,
1902                                 SKB_MAX_HEAD(cdev->skb_tx_rsvd),
1903                                 conn->max_xmit_dlength);
1904
1905         tdata->skb = alloc_skb(cdev->skb_tx_rsvd + headroom, GFP_ATOMIC);
1906         if (!tdata->skb) {
1907                 struct cxgbi_sock *csk = cconn->cep->csk;
1908                 struct net_device *ndev = cdev->ports[csk->port_id];
1909                 ndev->stats.tx_dropped++;
1910                 return -ENOMEM;
1911         }
1912
1913         skb_get(tdata->skb);
1914         skb_reserve(tdata->skb, cdev->skb_tx_rsvd);
1915         task->hdr = (struct iscsi_hdr *)tdata->skb->data;
1916         task->hdr_max = SKB_TX_ISCSI_PDU_HEADER_MAX; /* BHS + AHS */
1917
1918         /* data_out uses scsi_cmd's itt */
1919         if (opcode != ISCSI_OP_SCSI_DATA_OUT)
1920                 task_reserve_itt(task, &task->hdr->itt);
1921
1922         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
1923                 "task 0x%p, op 0x%x, skb 0x%p,%u+%u/%u, itt 0x%x.\n",
1924                 task, opcode, tdata->skb, cdev->skb_tx_rsvd, headroom,
1925                 conn->max_xmit_dlength, ntohl(task->hdr->itt));
1926
1927         return 0;
1928 }
1929 EXPORT_SYMBOL_GPL(cxgbi_conn_alloc_pdu);
1930
1931 static inline void tx_skb_setmode(struct sk_buff *skb, int hcrc, int dcrc)
1932 {
1933         if (hcrc || dcrc) {
1934                 u8 submode = 0;
1935
1936                 if (hcrc)
1937                         submode |= 1;
1938                 if (dcrc)
1939                         submode |= 2;
1940                 cxgbi_skcb_ulp_mode(skb) = (ULP2_MODE_ISCSI << 4) | submode;
1941         } else
1942                 cxgbi_skcb_ulp_mode(skb) = 0;
1943 }
1944
1945 int cxgbi_conn_init_pdu(struct iscsi_task *task, unsigned int offset,
1946                               unsigned int count)
1947 {
1948         struct iscsi_conn *conn = task->conn;
1949         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1950         struct sk_buff *skb = tdata->skb;
1951         unsigned int datalen = count;
1952         int i, padlen = iscsi_padding(count);
1953         struct page *pg;
1954
1955         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
1956                 "task 0x%p,0x%p, skb 0x%p, 0x%x,0x%x,0x%x, %u+%u.\n",
1957                 task, task->sc, skb, (*skb->data) & ISCSI_OPCODE_MASK,
1958                 ntohl(task->cmdsn), ntohl(task->hdr->itt), offset, count);
1959
1960         skb_put(skb, task->hdr_len);
1961         tx_skb_setmode(skb, conn->hdrdgst_en, datalen ? conn->datadgst_en : 0);
1962         if (!count)
1963                 return 0;
1964
1965         if (task->sc) {
1966                 struct scsi_data_buffer *sdb = scsi_out(task->sc);
1967                 struct scatterlist *sg = NULL;
1968                 int err;
1969
1970                 tdata->offset = offset;
1971                 tdata->count = count;
1972                 err = sgl_seek_offset(
1973                                         sdb->table.sgl, sdb->table.nents,
1974                                         tdata->offset, &tdata->sgoffset, &sg);
1975                 if (err < 0) {
1976                         pr_warn("tpdu, sgl %u, bad offset %u/%u.\n",
1977                                 sdb->table.nents, tdata->offset, sdb->length);
1978                         return err;
1979                 }
1980                 err = sgl_read_to_frags(sg, tdata->sgoffset, tdata->count,
1981                                         tdata->frags, MAX_PDU_FRAGS);
1982                 if (err < 0) {
1983                         pr_warn("tpdu, sgl %u, bad offset %u + %u.\n",
1984                                 sdb->table.nents, tdata->offset, tdata->count);
1985                         return err;
1986                 }
1987                 tdata->nr_frags = err;
1988
1989                 if (tdata->nr_frags > MAX_SKB_FRAGS ||
1990                     (padlen && tdata->nr_frags == MAX_SKB_FRAGS)) {
1991                         char *dst = skb->data + task->hdr_len;
1992                         struct page_frag *frag = tdata->frags;
1993
1994                         /* data fits in the skb's headroom */
1995                         for (i = 0; i < tdata->nr_frags; i++, frag++) {
1996                                 char *src = kmap_atomic(frag->page);
1997
1998                                 memcpy(dst, src+frag->offset, frag->size);
1999                                 dst += frag->size;
2000                                 kunmap_atomic(src);
2001                         }
2002                         if (padlen) {
2003                                 memset(dst, 0, padlen);
2004                                 padlen = 0;
2005                         }
2006                         skb_put(skb, count + padlen);
2007                 } else {
2008                         /* data fit into frag_list */
2009                         for (i = 0; i < tdata->nr_frags; i++) {
2010                                 __skb_fill_page_desc(skb, i,
2011                                                 tdata->frags[i].page,
2012                                                 tdata->frags[i].offset,
2013                                                 tdata->frags[i].size);
2014                                 skb_frag_ref(skb, i);
2015                         }
2016                         skb_shinfo(skb)->nr_frags = tdata->nr_frags;
2017                         skb->len += count;
2018                         skb->data_len += count;
2019                         skb->truesize += count;
2020                 }
2021
2022         } else {
2023                 pg = virt_to_page(task->data);
2024
2025                 get_page(pg);
2026                 skb_fill_page_desc(skb, 0, pg, offset_in_page(task->data),
2027                                         count);
2028                 skb->len += count;
2029                 skb->data_len += count;
2030                 skb->truesize += count;
2031         }
2032
2033         if (padlen) {
2034                 i = skb_shinfo(skb)->nr_frags;
2035                 skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags,
2036                                 virt_to_page(padding), offset_in_page(padding),
2037                                 padlen);
2038
2039                 skb->data_len += padlen;
2040                 skb->truesize += padlen;
2041                 skb->len += padlen;
2042         }
2043
2044         return 0;
2045 }
2046 EXPORT_SYMBOL_GPL(cxgbi_conn_init_pdu);
2047
2048 int cxgbi_conn_xmit_pdu(struct iscsi_task *task)
2049 {
2050         struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
2051         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2052         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2053         struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
2054         struct sk_buff *skb = tdata->skb;
2055         struct cxgbi_sock *csk = NULL;
2056         unsigned int datalen;
2057         int err;
2058
2059         if (!skb || cxgbi_skcb_test_flag(skb, SKCBF_TX_DONE)) {
2060                 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2061                         "task 0x%p, skb 0x%p\n", task, skb);
2062                 return 0;
2063         }
2064
2065         if (cconn && cconn->cep)
2066                 csk = cconn->cep->csk;
2067         if (!csk) {
2068                 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2069                           "task 0x%p, csk gone.\n", task);
2070                 return -EPIPE;
2071         }
2072
2073         datalen = skb->data_len;
2074
2075         /* write ppod first if using ofldq to write ppod */
2076         if (ttinfo->flags & CXGBI_PPOD_INFO_FLAG_VALID) {
2077                 struct cxgbi_ppm *ppm = csk->cdev->cdev2ppm(csk->cdev);
2078
2079                 ttinfo->flags &= ~CXGBI_PPOD_INFO_FLAG_VALID;
2080                 if (csk->cdev->csk_ddp_set_map(ppm, csk, ttinfo) < 0)
2081                         pr_err("task 0x%p, ppod writing using ofldq failed.\n",
2082                                task);
2083                         /* continue. Let fl get the data */
2084         }
2085
2086         err = cxgbi_sock_send_pdus(cconn->cep->csk, skb);
2087         if (err > 0) {
2088                 int pdulen = err;
2089
2090                 log_debug(1 << CXGBI_DBG_PDU_TX,
2091                         "task 0x%p,0x%p, skb 0x%p, len %u/%u, rv %d.\n",
2092                         task, task->sc, skb, skb->len, skb->data_len, err);
2093
2094                 if (task->conn->hdrdgst_en)
2095                         pdulen += ISCSI_DIGEST_SIZE;
2096
2097                 if (datalen && task->conn->datadgst_en)
2098                         pdulen += ISCSI_DIGEST_SIZE;
2099
2100                 task->conn->txdata_octets += pdulen;
2101                 cxgbi_skcb_set_flag(skb, SKCBF_TX_DONE);
2102                 return 0;
2103         }
2104
2105         if (err == -EAGAIN || err == -ENOBUFS) {
2106                 log_debug(1 << CXGBI_DBG_PDU_TX,
2107                         "task 0x%p, skb 0x%p, len %u/%u, %d EAGAIN.\n",
2108                         task, skb, skb->len, skb->data_len, err);
2109                 /* reset skb to send when we are called again */
2110                 return err;
2111         }
2112
2113         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2114                 "itt 0x%x, skb 0x%p, len %u/%u, xmit err %d.\n",
2115                 task->itt, skb, skb->len, skb->data_len, err);
2116
2117         __kfree_skb(tdata->skb);
2118         tdata->skb = NULL;
2119
2120         iscsi_conn_printk(KERN_ERR, task->conn, "xmit err %d.\n", err);
2121         iscsi_conn_failure(task->conn, ISCSI_ERR_XMIT_FAILED);
2122         return err;
2123 }
2124 EXPORT_SYMBOL_GPL(cxgbi_conn_xmit_pdu);
2125
2126 void cxgbi_cleanup_task(struct iscsi_task *task)
2127 {
2128         struct iscsi_tcp_task *tcp_task = task->dd_data;
2129         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2130
2131         if (!tcp_task || !tdata || (tcp_task->dd_data != tdata)) {
2132                 pr_info("task 0x%p,0x%p, tcp_task 0x%p, tdata 0x%p/0x%p.\n",
2133                         task, task->sc, tcp_task,
2134                         tcp_task ? tcp_task->dd_data : NULL, tdata);
2135                 return;
2136         }
2137
2138         log_debug(1 << CXGBI_DBG_ISCSI,
2139                 "task 0x%p, skb 0x%p, itt 0x%x.\n",
2140                 task, tdata->skb, task->hdr_itt);
2141
2142         tcp_task->dd_data = NULL;
2143         /*  never reached the xmit task callout */
2144         if (tdata->skb) {
2145                 kfree_skb(tdata->skb);
2146                 tdata->skb = NULL;
2147         }
2148
2149         task_release_itt(task, task->hdr_itt);
2150         memset(tdata, 0, sizeof(*tdata));
2151
2152         iscsi_tcp_cleanup_task(task);
2153 }
2154 EXPORT_SYMBOL_GPL(cxgbi_cleanup_task);
2155
2156 void cxgbi_get_conn_stats(struct iscsi_cls_conn *cls_conn,
2157                                 struct iscsi_stats *stats)
2158 {
2159         struct iscsi_conn *conn = cls_conn->dd_data;
2160
2161         stats->txdata_octets = conn->txdata_octets;
2162         stats->rxdata_octets = conn->rxdata_octets;
2163         stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
2164         stats->dataout_pdus = conn->dataout_pdus_cnt;
2165         stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
2166         stats->datain_pdus = conn->datain_pdus_cnt;
2167         stats->r2t_pdus = conn->r2t_pdus_cnt;
2168         stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
2169         stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
2170         stats->digest_err = 0;
2171         stats->timeout_err = 0;
2172         stats->custom_length = 1;
2173         strcpy(stats->custom[0].desc, "eh_abort_cnt");
2174         stats->custom[0].value = conn->eh_abort_cnt;
2175 }
2176 EXPORT_SYMBOL_GPL(cxgbi_get_conn_stats);
2177
2178 static int cxgbi_conn_max_xmit_dlength(struct iscsi_conn *conn)
2179 {
2180         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2181         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2182         struct cxgbi_device *cdev = cconn->chba->cdev;
2183         unsigned int headroom = SKB_MAX_HEAD(cdev->skb_tx_rsvd);
2184         unsigned int max_def = 512 * MAX_SKB_FRAGS;
2185         unsigned int max = max(max_def, headroom);
2186
2187         max = min(cconn->chba->cdev->tx_max_size, max);
2188         if (conn->max_xmit_dlength)
2189                 conn->max_xmit_dlength = min(conn->max_xmit_dlength, max);
2190         else
2191                 conn->max_xmit_dlength = max;
2192         cxgbi_align_pdu_size(conn->max_xmit_dlength);
2193
2194         return 0;
2195 }
2196
2197 static int cxgbi_conn_max_recv_dlength(struct iscsi_conn *conn)
2198 {
2199         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2200         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2201         unsigned int max = cconn->chba->cdev->rx_max_size;
2202
2203         cxgbi_align_pdu_size(max);
2204
2205         if (conn->max_recv_dlength) {
2206                 if (conn->max_recv_dlength > max) {
2207                         pr_err("MaxRecvDataSegmentLength %u > %u.\n",
2208                                 conn->max_recv_dlength, max);
2209                         return -EINVAL;
2210                 }
2211                 conn->max_recv_dlength = min(conn->max_recv_dlength, max);
2212                 cxgbi_align_pdu_size(conn->max_recv_dlength);
2213         } else
2214                 conn->max_recv_dlength = max;
2215
2216         return 0;
2217 }
2218
2219 int cxgbi_set_conn_param(struct iscsi_cls_conn *cls_conn,
2220                         enum iscsi_param param, char *buf, int buflen)
2221 {
2222         struct iscsi_conn *conn = cls_conn->dd_data;
2223         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2224         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2225         struct cxgbi_sock *csk = cconn->cep->csk;
2226         int err;
2227
2228         log_debug(1 << CXGBI_DBG_ISCSI,
2229                 "cls_conn 0x%p, param %d, buf(%d) %s.\n",
2230                 cls_conn, param, buflen, buf);
2231
2232         switch (param) {
2233         case ISCSI_PARAM_HDRDGST_EN:
2234                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2235                 if (!err && conn->hdrdgst_en)
2236                         err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2237                                                         conn->hdrdgst_en,
2238                                                         conn->datadgst_en, 0);
2239                 break;
2240         case ISCSI_PARAM_DATADGST_EN:
2241                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2242                 if (!err && conn->datadgst_en)
2243                         err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2244                                                         conn->hdrdgst_en,
2245                                                         conn->datadgst_en, 0);
2246                 break;
2247         case ISCSI_PARAM_MAX_R2T:
2248                 return iscsi_tcp_set_max_r2t(conn, buf);
2249         case ISCSI_PARAM_MAX_RECV_DLENGTH:
2250                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2251                 if (!err)
2252                         err = cxgbi_conn_max_recv_dlength(conn);
2253                 break;
2254         case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2255                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2256                 if (!err)
2257                         err = cxgbi_conn_max_xmit_dlength(conn);
2258                 break;
2259         default:
2260                 return iscsi_set_param(cls_conn, param, buf, buflen);
2261         }
2262         return err;
2263 }
2264 EXPORT_SYMBOL_GPL(cxgbi_set_conn_param);
2265
2266 static inline int csk_print_port(struct cxgbi_sock *csk, char *buf)
2267 {
2268         int len;
2269
2270         cxgbi_sock_get(csk);
2271         len = sprintf(buf, "%hu\n", ntohs(csk->daddr.sin_port));
2272         cxgbi_sock_put(csk);
2273
2274         return len;
2275 }
2276
2277 static inline int csk_print_ip(struct cxgbi_sock *csk, char *buf)
2278 {
2279         int len;
2280
2281         cxgbi_sock_get(csk);
2282         if (csk->csk_family == AF_INET)
2283                 len = sprintf(buf, "%pI4",
2284                               &csk->daddr.sin_addr.s_addr);
2285         else
2286                 len = sprintf(buf, "%pI6",
2287                               &csk->daddr6.sin6_addr);
2288
2289         cxgbi_sock_put(csk);
2290
2291         return len;
2292 }
2293
2294 int cxgbi_get_ep_param(struct iscsi_endpoint *ep, enum iscsi_param param,
2295                        char *buf)
2296 {
2297         struct cxgbi_endpoint *cep = ep->dd_data;
2298         struct cxgbi_sock *csk;
2299         int len;
2300
2301         log_debug(1 << CXGBI_DBG_ISCSI,
2302                 "cls_conn 0x%p, param %d.\n", ep, param);
2303
2304         switch (param) {
2305         case ISCSI_PARAM_CONN_PORT:
2306         case ISCSI_PARAM_CONN_ADDRESS:
2307                 if (!cep)
2308                         return -ENOTCONN;
2309
2310                 csk = cep->csk;
2311                 if (!csk)
2312                         return -ENOTCONN;
2313
2314                 return iscsi_conn_get_addr_param((struct sockaddr_storage *)
2315                                                  &csk->daddr, param, buf);
2316         default:
2317                 return -ENOSYS;
2318         }
2319         return len;
2320 }
2321 EXPORT_SYMBOL_GPL(cxgbi_get_ep_param);
2322
2323 struct iscsi_cls_conn *
2324 cxgbi_create_conn(struct iscsi_cls_session *cls_session, u32 cid)
2325 {
2326         struct iscsi_cls_conn *cls_conn;
2327         struct iscsi_conn *conn;
2328         struct iscsi_tcp_conn *tcp_conn;
2329         struct cxgbi_conn *cconn;
2330
2331         cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*cconn), cid);
2332         if (!cls_conn)
2333                 return NULL;
2334
2335         conn = cls_conn->dd_data;
2336         tcp_conn = conn->dd_data;
2337         cconn = tcp_conn->dd_data;
2338         cconn->iconn = conn;
2339
2340         log_debug(1 << CXGBI_DBG_ISCSI,
2341                 "cid %u(0x%x), cls 0x%p,0x%p, conn 0x%p,0x%p,0x%p.\n",
2342                 cid, cid, cls_session, cls_conn, conn, tcp_conn, cconn);
2343
2344         return cls_conn;
2345 }
2346 EXPORT_SYMBOL_GPL(cxgbi_create_conn);
2347
2348 int cxgbi_bind_conn(struct iscsi_cls_session *cls_session,
2349                                 struct iscsi_cls_conn *cls_conn,
2350                                 u64 transport_eph, int is_leading)
2351 {
2352         struct iscsi_conn *conn = cls_conn->dd_data;
2353         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2354         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2355         struct cxgbi_ppm *ppm;
2356         struct iscsi_endpoint *ep;
2357         struct cxgbi_endpoint *cep;
2358         struct cxgbi_sock *csk;
2359         int err;
2360
2361         ep = iscsi_lookup_endpoint(transport_eph);
2362         if (!ep)
2363                 return -EINVAL;
2364
2365         /*  setup ddp pagesize */
2366         cep = ep->dd_data;
2367         csk = cep->csk;
2368
2369         ppm = csk->cdev->cdev2ppm(csk->cdev);
2370         err = csk->cdev->csk_ddp_setup_pgidx(csk, csk->tid,
2371                                              ppm->tformat.pgsz_idx_dflt, 0);
2372         if (err < 0)
2373                 return err;
2374
2375         err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
2376         if (err)
2377                 return -EINVAL;
2378
2379         /*  calculate the tag idx bits needed for this conn based on cmds_max */
2380         cconn->task_idx_bits = (__ilog2_u32(conn->session->cmds_max - 1)) + 1;
2381
2382         write_lock_bh(&csk->callback_lock);
2383         csk->user_data = conn;
2384         cconn->chba = cep->chba;
2385         cconn->cep = cep;
2386         cep->cconn = cconn;
2387         write_unlock_bh(&csk->callback_lock);
2388
2389         cxgbi_conn_max_xmit_dlength(conn);
2390         cxgbi_conn_max_recv_dlength(conn);
2391
2392         log_debug(1 << CXGBI_DBG_ISCSI,
2393                 "cls 0x%p,0x%p, ep 0x%p, cconn 0x%p, csk 0x%p.\n",
2394                 cls_session, cls_conn, ep, cconn, csk);
2395         /*  init recv engine */
2396         iscsi_tcp_hdr_recv_prep(tcp_conn);
2397
2398         return 0;
2399 }
2400 EXPORT_SYMBOL_GPL(cxgbi_bind_conn);
2401
2402 struct iscsi_cls_session *cxgbi_create_session(struct iscsi_endpoint *ep,
2403                                                 u16 cmds_max, u16 qdepth,
2404                                                 u32 initial_cmdsn)
2405 {
2406         struct cxgbi_endpoint *cep;
2407         struct cxgbi_hba *chba;
2408         struct Scsi_Host *shost;
2409         struct iscsi_cls_session *cls_session;
2410         struct iscsi_session *session;
2411
2412         if (!ep) {
2413                 pr_err("missing endpoint.\n");
2414                 return NULL;
2415         }
2416
2417         cep = ep->dd_data;
2418         chba = cep->chba;
2419         shost = chba->shost;
2420
2421         BUG_ON(chba != iscsi_host_priv(shost));
2422
2423         cls_session = iscsi_session_setup(chba->cdev->itp, shost,
2424                                         cmds_max, 0,
2425                                         sizeof(struct iscsi_tcp_task) +
2426                                         sizeof(struct cxgbi_task_data),
2427                                         initial_cmdsn, ISCSI_MAX_TARGET);
2428         if (!cls_session)
2429                 return NULL;
2430
2431         session = cls_session->dd_data;
2432         if (iscsi_tcp_r2tpool_alloc(session))
2433                 goto remove_session;
2434
2435         log_debug(1 << CXGBI_DBG_ISCSI,
2436                 "ep 0x%p, cls sess 0x%p.\n", ep, cls_session);
2437         return cls_session;
2438
2439 remove_session:
2440         iscsi_session_teardown(cls_session);
2441         return NULL;
2442 }
2443 EXPORT_SYMBOL_GPL(cxgbi_create_session);
2444
2445 void cxgbi_destroy_session(struct iscsi_cls_session *cls_session)
2446 {
2447         log_debug(1 << CXGBI_DBG_ISCSI,
2448                 "cls sess 0x%p.\n", cls_session);
2449
2450         iscsi_tcp_r2tpool_free(cls_session->dd_data);
2451         iscsi_session_teardown(cls_session);
2452 }
2453 EXPORT_SYMBOL_GPL(cxgbi_destroy_session);
2454
2455 int cxgbi_set_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2456                         char *buf, int buflen)
2457 {
2458         struct cxgbi_hba *chba = iscsi_host_priv(shost);
2459
2460         if (!chba->ndev) {
2461                 shost_printk(KERN_ERR, shost, "Could not get host param. "
2462                                 "netdev for host not set.\n");
2463                 return -ENODEV;
2464         }
2465
2466         log_debug(1 << CXGBI_DBG_ISCSI,
2467                 "shost 0x%p, hba 0x%p,%s, param %d, buf(%d) %s.\n",
2468                 shost, chba, chba->ndev->name, param, buflen, buf);
2469
2470         switch (param) {
2471         case ISCSI_HOST_PARAM_IPADDRESS:
2472         {
2473                 __be32 addr = in_aton(buf);
2474                 log_debug(1 << CXGBI_DBG_ISCSI,
2475                         "hba %s, req. ipv4 %pI4.\n", chba->ndev->name, &addr);
2476                 cxgbi_set_iscsi_ipv4(chba, addr);
2477                 return 0;
2478         }
2479         case ISCSI_HOST_PARAM_HWADDRESS:
2480         case ISCSI_HOST_PARAM_NETDEV_NAME:
2481                 return 0;
2482         default:
2483                 return iscsi_host_set_param(shost, param, buf, buflen);
2484         }
2485 }
2486 EXPORT_SYMBOL_GPL(cxgbi_set_host_param);
2487
2488 int cxgbi_get_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2489                         char *buf)
2490 {
2491         struct cxgbi_hba *chba = iscsi_host_priv(shost);
2492         int len = 0;
2493
2494         if (!chba->ndev) {
2495                 shost_printk(KERN_ERR, shost, "Could not get host param. "
2496                                 "netdev for host not set.\n");
2497                 return -ENODEV;
2498         }
2499
2500         log_debug(1 << CXGBI_DBG_ISCSI,
2501                 "shost 0x%p, hba 0x%p,%s, param %d.\n",
2502                 shost, chba, chba->ndev->name, param);
2503
2504         switch (param) {
2505         case ISCSI_HOST_PARAM_HWADDRESS:
2506                 len = sysfs_format_mac(buf, chba->ndev->dev_addr, 6);
2507                 break;
2508         case ISCSI_HOST_PARAM_NETDEV_NAME:
2509                 len = sprintf(buf, "%s\n", chba->ndev->name);
2510                 break;
2511         case ISCSI_HOST_PARAM_IPADDRESS:
2512         {
2513                 struct cxgbi_sock *csk = find_sock_on_port(chba->cdev,
2514                                                            chba->port_id);
2515                 if (csk) {
2516                         len = sprintf(buf, "%pIS",
2517                                       (struct sockaddr *)&csk->saddr);
2518                 }
2519                 log_debug(1 << CXGBI_DBG_ISCSI,
2520                           "hba %s, addr %s.\n", chba->ndev->name, buf);
2521                 break;
2522         }
2523         default:
2524                 return iscsi_host_get_param(shost, param, buf);
2525         }
2526
2527         return len;
2528 }
2529 EXPORT_SYMBOL_GPL(cxgbi_get_host_param);
2530
2531 struct iscsi_endpoint *cxgbi_ep_connect(struct Scsi_Host *shost,
2532                                         struct sockaddr *dst_addr,
2533                                         int non_blocking)
2534 {
2535         struct iscsi_endpoint *ep;
2536         struct cxgbi_endpoint *cep;
2537         struct cxgbi_hba *hba = NULL;
2538         struct cxgbi_sock *csk;
2539         int err = -EINVAL;
2540
2541         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2542                 "shost 0x%p, non_blocking %d, dst_addr 0x%p.\n",
2543                 shost, non_blocking, dst_addr);
2544
2545         if (shost) {
2546                 hba = iscsi_host_priv(shost);
2547                 if (!hba) {
2548                         pr_info("shost 0x%p, priv NULL.\n", shost);
2549                         goto err_out;
2550                 }
2551         }
2552
2553         if (dst_addr->sa_family == AF_INET) {
2554                 csk = cxgbi_check_route(dst_addr);
2555 #if IS_ENABLED(CONFIG_IPV6)
2556         } else if (dst_addr->sa_family == AF_INET6) {
2557                 csk = cxgbi_check_route6(dst_addr);
2558 #endif
2559         } else {
2560                 pr_info("address family 0x%x NOT supported.\n",
2561                         dst_addr->sa_family);
2562                 err = -EAFNOSUPPORT;
2563                 return (struct iscsi_endpoint *)ERR_PTR(err);
2564         }
2565
2566         if (IS_ERR(csk))
2567                 return (struct iscsi_endpoint *)csk;
2568         cxgbi_sock_get(csk);
2569
2570         if (!hba)
2571                 hba = csk->cdev->hbas[csk->port_id];
2572         else if (hba != csk->cdev->hbas[csk->port_id]) {
2573                 pr_info("Could not connect through requested host %u"
2574                         "hba 0x%p != 0x%p (%u).\n",
2575                         shost->host_no, hba,
2576                         csk->cdev->hbas[csk->port_id], csk->port_id);
2577                 err = -ENOSPC;
2578                 goto release_conn;
2579         }
2580
2581         err = sock_get_port(csk);
2582         if (err)
2583                 goto release_conn;
2584
2585         cxgbi_sock_set_state(csk, CTP_CONNECTING);
2586         err = csk->cdev->csk_init_act_open(csk);
2587         if (err)
2588                 goto release_conn;
2589
2590         if (cxgbi_sock_is_closing(csk)) {
2591                 err = -ENOSPC;
2592                 pr_info("csk 0x%p is closing.\n", csk);
2593                 goto release_conn;
2594         }
2595
2596         ep = iscsi_create_endpoint(sizeof(*cep));
2597         if (!ep) {
2598                 err = -ENOMEM;
2599                 pr_info("iscsi alloc ep, OOM.\n");
2600                 goto release_conn;
2601         }
2602
2603         cep = ep->dd_data;
2604         cep->csk = csk;
2605         cep->chba = hba;
2606
2607         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2608                 "ep 0x%p, cep 0x%p, csk 0x%p, hba 0x%p,%s.\n",
2609                 ep, cep, csk, hba, hba->ndev->name);
2610         return ep;
2611
2612 release_conn:
2613         cxgbi_sock_put(csk);
2614         cxgbi_sock_closed(csk);
2615 err_out:
2616         return ERR_PTR(err);
2617 }
2618 EXPORT_SYMBOL_GPL(cxgbi_ep_connect);
2619
2620 int cxgbi_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
2621 {
2622         struct cxgbi_endpoint *cep = ep->dd_data;
2623         struct cxgbi_sock *csk = cep->csk;
2624
2625         if (!cxgbi_sock_is_established(csk))
2626                 return 0;
2627         return 1;
2628 }
2629 EXPORT_SYMBOL_GPL(cxgbi_ep_poll);
2630
2631 void cxgbi_ep_disconnect(struct iscsi_endpoint *ep)
2632 {
2633         struct cxgbi_endpoint *cep = ep->dd_data;
2634         struct cxgbi_conn *cconn = cep->cconn;
2635         struct cxgbi_sock *csk = cep->csk;
2636
2637         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2638                 "ep 0x%p, cep 0x%p, cconn 0x%p, csk 0x%p,%u,0x%lx.\n",
2639                 ep, cep, cconn, csk, csk->state, csk->flags);
2640
2641         if (cconn && cconn->iconn) {
2642                 iscsi_suspend_tx(cconn->iconn);
2643                 write_lock_bh(&csk->callback_lock);
2644                 cep->csk->user_data = NULL;
2645                 cconn->cep = NULL;
2646                 write_unlock_bh(&csk->callback_lock);
2647         }
2648         iscsi_destroy_endpoint(ep);
2649
2650         if (likely(csk->state >= CTP_ESTABLISHED))
2651                 need_active_close(csk);
2652         else
2653                 cxgbi_sock_closed(csk);
2654
2655         cxgbi_sock_put(csk);
2656 }
2657 EXPORT_SYMBOL_GPL(cxgbi_ep_disconnect);
2658
2659 int cxgbi_iscsi_init(struct iscsi_transport *itp,
2660                         struct scsi_transport_template **stt)
2661 {
2662         *stt = iscsi_register_transport(itp);
2663         if (*stt == NULL) {
2664                 pr_err("unable to register %s transport 0x%p.\n",
2665                         itp->name, itp);
2666                 return -ENODEV;
2667         }
2668         log_debug(1 << CXGBI_DBG_ISCSI,
2669                 "%s, registered iscsi transport 0x%p.\n",
2670                 itp->name, stt);
2671         return 0;
2672 }
2673 EXPORT_SYMBOL_GPL(cxgbi_iscsi_init);
2674
2675 void cxgbi_iscsi_cleanup(struct iscsi_transport *itp,
2676                         struct scsi_transport_template **stt)
2677 {
2678         if (*stt) {
2679                 log_debug(1 << CXGBI_DBG_ISCSI,
2680                         "de-register transport 0x%p, %s, stt 0x%p.\n",
2681                         itp, itp->name, *stt);
2682                 *stt = NULL;
2683                 iscsi_unregister_transport(itp);
2684         }
2685 }
2686 EXPORT_SYMBOL_GPL(cxgbi_iscsi_cleanup);
2687
2688 umode_t cxgbi_attr_is_visible(int param_type, int param)
2689 {
2690         switch (param_type) {
2691         case ISCSI_HOST_PARAM:
2692                 switch (param) {
2693                 case ISCSI_HOST_PARAM_NETDEV_NAME:
2694                 case ISCSI_HOST_PARAM_HWADDRESS:
2695                 case ISCSI_HOST_PARAM_IPADDRESS:
2696                 case ISCSI_HOST_PARAM_INITIATOR_NAME:
2697                         return S_IRUGO;
2698                 default:
2699                         return 0;
2700                 }
2701         case ISCSI_PARAM:
2702                 switch (param) {
2703                 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2704                 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2705                 case ISCSI_PARAM_HDRDGST_EN:
2706                 case ISCSI_PARAM_DATADGST_EN:
2707                 case ISCSI_PARAM_CONN_ADDRESS:
2708                 case ISCSI_PARAM_CONN_PORT:
2709                 case ISCSI_PARAM_EXP_STATSN:
2710                 case ISCSI_PARAM_PERSISTENT_ADDRESS:
2711                 case ISCSI_PARAM_PERSISTENT_PORT:
2712                 case ISCSI_PARAM_PING_TMO:
2713                 case ISCSI_PARAM_RECV_TMO:
2714                 case ISCSI_PARAM_INITIAL_R2T_EN:
2715                 case ISCSI_PARAM_MAX_R2T:
2716                 case ISCSI_PARAM_IMM_DATA_EN:
2717                 case ISCSI_PARAM_FIRST_BURST:
2718                 case ISCSI_PARAM_MAX_BURST:
2719                 case ISCSI_PARAM_PDU_INORDER_EN:
2720                 case ISCSI_PARAM_DATASEQ_INORDER_EN:
2721                 case ISCSI_PARAM_ERL:
2722                 case ISCSI_PARAM_TARGET_NAME:
2723                 case ISCSI_PARAM_TPGT:
2724                 case ISCSI_PARAM_USERNAME:
2725                 case ISCSI_PARAM_PASSWORD:
2726                 case ISCSI_PARAM_USERNAME_IN:
2727                 case ISCSI_PARAM_PASSWORD_IN:
2728                 case ISCSI_PARAM_FAST_ABORT:
2729                 case ISCSI_PARAM_ABORT_TMO:
2730                 case ISCSI_PARAM_LU_RESET_TMO:
2731                 case ISCSI_PARAM_TGT_RESET_TMO:
2732                 case ISCSI_PARAM_IFACE_NAME:
2733                 case ISCSI_PARAM_INITIATOR_NAME:
2734                         return S_IRUGO;
2735                 default:
2736                         return 0;
2737                 }
2738         }
2739
2740         return 0;
2741 }
2742 EXPORT_SYMBOL_GPL(cxgbi_attr_is_visible);
2743
2744 static int __init libcxgbi_init_module(void)
2745 {
2746         pr_info("%s", version);
2747
2748         BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, cb) <
2749                      sizeof(struct cxgbi_skb_cb));
2750         return 0;
2751 }
2752
2753 static void __exit libcxgbi_exit_module(void)
2754 {
2755         cxgbi_device_unregister_all(0xFF);
2756         return;
2757 }
2758
2759 module_init(libcxgbi_init_module);
2760 module_exit(libcxgbi_exit_module);