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         timer_setup(&csk->retry_timer, NULL, 0);
 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                                       int ifindex)
 590 {
 591         struct rtable *rt;
 592
 593         rt = ip_route_output_ports(&init_net, fl4, NULL, daddr, saddr,
 594                                    dport, sport, IPPROTO_TCP, tos, ifindex);
 595         if (IS_ERR(rt))
 596                 return NULL;
 597
 598         return rt;
 599 }
 600
 601 static struct cxgbi_sock *
 602 cxgbi_check_route(struct sockaddr *dst_addr, int ifindex)
 603 {
 604         struct sockaddr_in *daddr = (struct sockaddr_in *)dst_addr;
 605         struct dst_entry *dst;
 606         struct net_device *ndev;
 607         struct cxgbi_device *cdev;
 608         struct rtable *rt = NULL;
 609         struct neighbour *n;
 610         struct flowi4 fl4;
 611         struct cxgbi_sock *csk = NULL;
 612         unsigned int mtu = 0;
 613         int port = 0xFFFF;
 614         int err = 0;
 615
 616         rt = find_route_ipv4(&fl4, 0, daddr->sin_addr.s_addr, 0,
 617                              daddr->sin_port, 0, ifindex);
 618         if (!rt) {
 619                 pr_info("no route to ipv4 0x%x, port %u.\n",
 620                         be32_to_cpu(daddr->sin_addr.s_addr),
 621                         be16_to_cpu(daddr->sin_port));
 622                 err = -ENETUNREACH;
 623                 goto err_out;
 624         }
 625         dst = &rt->dst;
 626         n = dst_neigh_lookup(dst, &daddr->sin_addr.s_addr);
 627         if (!n) {
 628                 err = -ENODEV;
 629                 goto rel_rt;
 630         }
 631         ndev = n->dev;
 632
 633         if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) {
 634                 pr_info("multi-cast route %pI4, port %u, dev %s.\n",
 635                         &daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
 636                         ndev->name);
 637                 err = -ENETUNREACH;
 638                 goto rel_neigh;
 639         }
 640
 641         if (ndev->flags & IFF_LOOPBACK) {
 642                 ndev = ip_dev_find(&init_net, daddr->sin_addr.s_addr);
 643                 mtu = ndev->mtu;
 644                 pr_info("rt dev %s, loopback -> %s, mtu %u.\n",
 645                         n->dev->name, ndev->name, mtu);
 646         }
 647
 648         if (!(ndev->flags & IFF_UP) || !netif_carrier_ok(ndev)) {
 649                 pr_info("%s interface not up.\n", ndev->name);
 650                 err = -ENETDOWN;
 651                 goto rel_neigh;
 652         }
 653
 654         cdev = cxgbi_device_find_by_netdev(ndev, &port);
 655         if (!cdev) {
 656                 pr_info("dst %pI4, %s, NOT cxgbi device.\n",
 657                         &daddr->sin_addr.s_addr, ndev->name);
 658                 err = -ENETUNREACH;
 659                 goto rel_neigh;
 660         }
 661         log_debug(1 << CXGBI_DBG_SOCK,
 662                 "route to %pI4 :%u, ndev p#%d,%s, cdev 0x%p.\n",
 663                 &daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
 664                            port, ndev->name, cdev);
 665
 666         csk = cxgbi_sock_create(cdev);
 667         if (!csk) {
 668                 err = -ENOMEM;
 669                 goto rel_neigh;
 670         }
 671         csk->cdev = cdev;
 672         csk->port_id = port;
 673         csk->mtu = mtu;
 674         csk->dst = dst;
 675
 676         csk->csk_family = AF_INET;
 677         csk->daddr.sin_addr.s_addr = daddr->sin_addr.s_addr;
 678         csk->daddr.sin_port = daddr->sin_port;
 679         csk->daddr.sin_family = daddr->sin_family;
 680         csk->saddr.sin_family = daddr->sin_family;
 681         csk->saddr.sin_addr.s_addr = fl4.saddr;
 682         neigh_release(n);
 683
 684         return csk;
 685
 686 rel_neigh:
 687         neigh_release(n);
 688
 689 rel_rt:
 690         ip_rt_put(rt);
 691 err_out:
 692         return ERR_PTR(err);
 693 }
 694
 695 #if IS_ENABLED(CONFIG_IPV6)
 696 static struct rt6_info *find_route_ipv6(const struct in6_addr *saddr,
 697                                         const struct in6_addr *daddr,
 698                                         int ifindex)
 699 {
 700         struct flowi6 fl;
 701
 702         memset(&fl, 0, sizeof(fl));
 703         fl.flowi6_oif = ifindex;
 704         if (saddr)
 705                 memcpy(&fl.saddr, saddr, sizeof(struct in6_addr));
 706         if (daddr)
 707                 memcpy(&fl.daddr, daddr, sizeof(struct in6_addr));
 708         return (struct rt6_info *)ip6_route_output(&init_net, NULL, &fl);
 709 }
 710
 711 static struct cxgbi_sock *
 712 cxgbi_check_route6(struct sockaddr *dst_addr, int ifindex)
 713 {
 714         struct sockaddr_in6 *daddr6 = (struct sockaddr_in6 *)dst_addr;
 715         struct dst_entry *dst;
 716         struct net_device *ndev;
 717         struct cxgbi_device *cdev;
 718         struct rt6_info *rt = NULL;
 719         struct neighbour *n;
 720         struct in6_addr pref_saddr;
 721         struct cxgbi_sock *csk = NULL;
 722         unsigned int mtu = 0;
 723         int port = 0xFFFF;
 724         int err = 0;
 725
 726         rt = find_route_ipv6(NULL, &daddr6->sin6_addr, ifindex);
 727
 728         if (!rt) {
 729                 pr_info("no route to ipv6 %pI6 port %u\n",
 730                         daddr6->sin6_addr.s6_addr,
 731                         be16_to_cpu(daddr6->sin6_port));
 732                 err = -ENETUNREACH;
 733                 goto err_out;
 734         }
 735
 736         dst = &rt->dst;
 737
 738         n = dst_neigh_lookup(dst, &daddr6->sin6_addr);
 739
 740         if (!n) {
 741                 pr_info("%pI6, port %u, dst no neighbour.\n",
 742                         daddr6->sin6_addr.s6_addr,
 743                         be16_to_cpu(daddr6->sin6_port));
 744                 err = -ENETUNREACH;
 745                 goto rel_rt;
 746         }
 747         ndev = n->dev;
 748
 749         if (!(ndev->flags & IFF_UP) || !netif_carrier_ok(ndev)) {
 750                 pr_info("%s interface not up.\n", ndev->name);
 751                 err = -ENETDOWN;
 752                 goto rel_rt;
 753         }
 754
 755         if (ipv6_addr_is_multicast(&daddr6->sin6_addr)) {
 756                 pr_info("multi-cast route %pI6 port %u, dev %s.\n",
 757                         daddr6->sin6_addr.s6_addr,
 758                         ntohs(daddr6->sin6_port), ndev->name);
 759                 err = -ENETUNREACH;
 760                 goto rel_rt;
 761         }
 762
 763         cdev = cxgbi_device_find_by_netdev(ndev, &port);
 764         if (!cdev)
 765                 cdev = cxgbi_device_find_by_mac(ndev, &port);
 766         if (!cdev) {
 767                 pr_info("dst %pI6 %s, NOT cxgbi device.\n",
 768                         daddr6->sin6_addr.s6_addr, ndev->name);
 769                 err = -ENETUNREACH;
 770                 goto rel_rt;
 771         }
 772         log_debug(1 << CXGBI_DBG_SOCK,
 773                   "route to %pI6 :%u, ndev p#%d,%s, cdev 0x%p.\n",
 774                   daddr6->sin6_addr.s6_addr, ntohs(daddr6->sin6_port), port,
 775                   ndev->name, cdev);
 776
 777         csk = cxgbi_sock_create(cdev);
 778         if (!csk) {
 779                 err = -ENOMEM;
 780                 goto rel_rt;
 781         }
 782         csk->cdev = cdev;
 783         csk->port_id = port;
 784         csk->mtu = mtu;
 785         csk->dst = dst;
 786
 787         rt6_get_prefsrc(rt, &pref_saddr);
 788         if (ipv6_addr_any(&pref_saddr)) {
 789                 struct inet6_dev *idev = ip6_dst_idev((struct dst_entry *)rt);
 790
 791                 err = ipv6_dev_get_saddr(&init_net, idev ? idev->dev : NULL,
 792                                          &daddr6->sin6_addr, 0, &pref_saddr);
 793                 if (err) {
 794                         pr_info("failed to get source address to reach %pI6\n",
 795                                 &daddr6->sin6_addr);
 796                         goto rel_rt;
 797                 }
 798         }
 799
 800         csk->csk_family = AF_INET6;
 801         csk->daddr6.sin6_addr = daddr6->sin6_addr;
 802         csk->daddr6.sin6_port = daddr6->sin6_port;
 803         csk->daddr6.sin6_family = daddr6->sin6_family;
 804         csk->saddr6.sin6_family = daddr6->sin6_family;
 805         csk->saddr6.sin6_addr = pref_saddr;
 806
 807         neigh_release(n);
 808         return csk;
 809
 810 rel_rt:
 811         if (n)
 812                 neigh_release(n);
 813
 814         ip6_rt_put(rt);
 815         if (csk)
 816                 cxgbi_sock_closed(csk);
 817 err_out:
 818         return ERR_PTR(err);
 819 }
 820 #endif /* IS_ENABLED(CONFIG_IPV6) */
 821
 822 void cxgbi_sock_established(struct cxgbi_sock *csk, unsigned int snd_isn,
 823                         unsigned int opt)
 824 {
 825         csk->write_seq = csk->snd_nxt = csk->snd_una = snd_isn;
 826         dst_confirm(csk->dst);
 827         smp_mb();
 828         cxgbi_sock_set_state(csk, CTP_ESTABLISHED);
 829 }
 830 EXPORT_SYMBOL_GPL(cxgbi_sock_established);
 831
 832 static void cxgbi_inform_iscsi_conn_closing(struct cxgbi_sock *csk)
 833 {
 834         log_debug(1 << CXGBI_DBG_SOCK,
 835                 "csk 0x%p, state %u, flags 0x%lx, conn 0x%p.\n",
 836                 csk, csk->state, csk->flags, csk->user_data);
 837
 838         if (csk->state != CTP_ESTABLISHED) {
 839                 read_lock_bh(&csk->callback_lock);
 840                 if (csk->user_data)
 841                         iscsi_conn_failure(csk->user_data,
 842                                         ISCSI_ERR_TCP_CONN_CLOSE);
 843                 read_unlock_bh(&csk->callback_lock);
 844         }
 845 }
 846
 847 void cxgbi_sock_closed(struct cxgbi_sock *csk)
 848 {
 849         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 850                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 851         cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
 852         if (csk->state == CTP_ACTIVE_OPEN || csk->state == CTP_CLOSED)
 853                 return;
 854         if (csk->saddr.sin_port)
 855                 sock_put_port(csk);
 856         if (csk->dst)
 857                 dst_release(csk->dst);
 858         csk->cdev->csk_release_offload_resources(csk);
 859         cxgbi_sock_set_state(csk, CTP_CLOSED);
 860         cxgbi_inform_iscsi_conn_closing(csk);
 861         cxgbi_sock_put(csk);
 862 }
 863 EXPORT_SYMBOL_GPL(cxgbi_sock_closed);
 864
 865 static void need_active_close(struct cxgbi_sock *csk)
 866 {
 867         int data_lost;
 868         int close_req = 0;
 869
 870         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 871                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 872         spin_lock_bh(&csk->lock);
 873         if (csk->dst)
 874                 dst_confirm(csk->dst);
 875         data_lost = skb_queue_len(&csk->receive_queue);
 876         __skb_queue_purge(&csk->receive_queue);
 877
 878         if (csk->state == CTP_ACTIVE_OPEN)
 879                 cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
 880         else if (csk->state == CTP_ESTABLISHED) {
 881                 close_req = 1;
 882                 cxgbi_sock_set_state(csk, CTP_ACTIVE_CLOSE);
 883         } else if (csk->state == CTP_PASSIVE_CLOSE) {
 884                 close_req = 1;
 885                 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
 886         }
 887
 888         if (close_req) {
 889                 if (!cxgbi_sock_flag(csk, CTPF_LOGOUT_RSP_RCVD) ||
 890                     data_lost)
 891                         csk->cdev->csk_send_abort_req(csk);
 892                 else
 893                         csk->cdev->csk_send_close_req(csk);
 894         }
 895
 896         spin_unlock_bh(&csk->lock);
 897 }
 898
 899 void cxgbi_sock_fail_act_open(struct cxgbi_sock *csk, int errno)
 900 {
 901         pr_info("csk 0x%p,%u,%lx, %pI4:%u-%pI4:%u, err %d.\n",
 902                         csk, csk->state, csk->flags,
 903                         &csk->saddr.sin_addr.s_addr, csk->saddr.sin_port,
 904                         &csk->daddr.sin_addr.s_addr, csk->daddr.sin_port,
 905                         errno);
 906
 907         cxgbi_sock_set_state(csk, CTP_CONNECTING);
 908         csk->err = errno;
 909         cxgbi_sock_closed(csk);
 910 }
 911 EXPORT_SYMBOL_GPL(cxgbi_sock_fail_act_open);
 912
 913 void cxgbi_sock_act_open_req_arp_failure(void *handle, struct sk_buff *skb)
 914 {
 915         struct cxgbi_sock *csk = (struct cxgbi_sock *)skb->sk;
 916         struct module *owner = csk->cdev->owner;
 917
 918         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 919                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 920         cxgbi_sock_get(csk);
 921         spin_lock_bh(&csk->lock);
 922         if (csk->state == CTP_ACTIVE_OPEN)
 923                 cxgbi_sock_fail_act_open(csk, -EHOSTUNREACH);
 924         spin_unlock_bh(&csk->lock);
 925         cxgbi_sock_put(csk);
 926         __kfree_skb(skb);
 927
 928         module_put(owner);
 929 }
 930 EXPORT_SYMBOL_GPL(cxgbi_sock_act_open_req_arp_failure);
 931
 932 void cxgbi_sock_rcv_abort_rpl(struct cxgbi_sock *csk)
 933 {
 934         cxgbi_sock_get(csk);
 935         spin_lock_bh(&csk->lock);
 936
 937         cxgbi_sock_set_flag(csk, CTPF_ABORT_RPL_RCVD);
 938         if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING)) {
 939                 cxgbi_sock_clear_flag(csk, CTPF_ABORT_RPL_PENDING);
 940                 if (cxgbi_sock_flag(csk, CTPF_ABORT_REQ_RCVD))
 941                         pr_err("csk 0x%p,%u,0x%lx,%u,ABT_RPL_RSS.\n",
 942                                csk, csk->state, csk->flags, csk->tid);
 943                 cxgbi_sock_closed(csk);
 944         }
 945
 946         spin_unlock_bh(&csk->lock);
 947         cxgbi_sock_put(csk);
 948 }
 949 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_abort_rpl);
 950
 951 void cxgbi_sock_rcv_peer_close(struct cxgbi_sock *csk)
 952 {
 953         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 954                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 955         cxgbi_sock_get(csk);
 956         spin_lock_bh(&csk->lock);
 957
 958         if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
 959                 goto done;
 960
 961         switch (csk->state) {
 962         case CTP_ESTABLISHED:
 963                 cxgbi_sock_set_state(csk, CTP_PASSIVE_CLOSE);
 964                 break;
 965         case CTP_ACTIVE_CLOSE:
 966                 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
 967                 break;
 968         case CTP_CLOSE_WAIT_1:
 969                 cxgbi_sock_closed(csk);
 970                 break;
 971         case CTP_ABORTING:
 972                 break;
 973         default:
 974                 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
 975                         csk, csk->state, csk->flags, csk->tid);
 976         }
 977         cxgbi_inform_iscsi_conn_closing(csk);
 978 done:
 979         spin_unlock_bh(&csk->lock);
 980         cxgbi_sock_put(csk);
 981 }
 982 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_peer_close);
 983
 984 void cxgbi_sock_rcv_close_conn_rpl(struct cxgbi_sock *csk, u32 snd_nxt)
 985 {
 986         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 987                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 988         cxgbi_sock_get(csk);
 989         spin_lock_bh(&csk->lock);
 990
 991         csk->snd_una = snd_nxt - 1;
 992         if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
 993                 goto done;
 994
 995         switch (csk->state) {
 996         case CTP_ACTIVE_CLOSE:
 997                 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_1);
 998                 break;
 999         case CTP_CLOSE_WAIT_1:
1000         case CTP_CLOSE_WAIT_2:
1001                 cxgbi_sock_closed(csk);
1002                 break;
1003         case CTP_ABORTING:
1004                 break;
1005         default:
1006                 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
1007                         csk, csk->state, csk->flags, csk->tid);
1008         }
1009 done:
1010         spin_unlock_bh(&csk->lock);
1011         cxgbi_sock_put(csk);
1012 }
1013 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_close_conn_rpl);
1014
1015 void cxgbi_sock_rcv_wr_ack(struct cxgbi_sock *csk, unsigned int credits,
1016                            unsigned int snd_una, int seq_chk)
1017 {
1018         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1019                         "csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, snd_una %u,%d.\n",
1020                         csk, csk->state, csk->flags, csk->tid, credits,
1021                         csk->wr_cred, csk->wr_una_cred, snd_una, seq_chk);
1022
1023         spin_lock_bh(&csk->lock);
1024
1025         csk->wr_cred += credits;
1026         if (csk->wr_una_cred > csk->wr_max_cred - csk->wr_cred)
1027                 csk->wr_una_cred = csk->wr_max_cred - csk->wr_cred;
1028
1029         while (credits) {
1030                 struct sk_buff *p = cxgbi_sock_peek_wr(csk);
1031
1032                 if (unlikely(!p)) {
1033                         pr_err("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, empty.\n",
1034                                 csk, csk->state, csk->flags, csk->tid, credits,
1035                                 csk->wr_cred, csk->wr_una_cred);
1036                         break;
1037                 }
1038
1039                 if (unlikely(credits < p->csum)) {
1040                         pr_warn("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, < %u.\n",
1041                                 csk, csk->state, csk->flags, csk->tid,
1042                                 credits, csk->wr_cred, csk->wr_una_cred,
1043                                 p->csum);
1044                         p->csum -= credits;
1045                         break;
1046                 } else {
1047                         cxgbi_sock_dequeue_wr(csk);
1048                         credits -= p->csum;
1049                         kfree_skb(p);
1050                 }
1051         }
1052
1053         cxgbi_sock_check_wr_invariants(csk);
1054
1055         if (seq_chk) {
1056                 if (unlikely(before(snd_una, csk->snd_una))) {
1057                         pr_warn("csk 0x%p,%u,0x%lx,%u, snd_una %u/%u.",
1058                                 csk, csk->state, csk->flags, csk->tid, snd_una,
1059                                 csk->snd_una);
1060                         goto done;
1061                 }
1062
1063                 if (csk->snd_una != snd_una) {
1064                         csk->snd_una = snd_una;
1065                         dst_confirm(csk->dst);
1066                 }
1067         }
1068
1069         if (skb_queue_len(&csk->write_queue)) {
1070                 if (csk->cdev->csk_push_tx_frames(csk, 0))
1071                         cxgbi_conn_tx_open(csk);
1072         } else
1073                 cxgbi_conn_tx_open(csk);
1074 done:
1075         spin_unlock_bh(&csk->lock);
1076 }
1077 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_wr_ack);
1078
1079 static unsigned int cxgbi_sock_find_best_mtu(struct cxgbi_sock *csk,
1080                                              unsigned short mtu)
1081 {
1082         int i = 0;
1083
1084         while (i < csk->cdev->nmtus - 1 && csk->cdev->mtus[i + 1] <= mtu)
1085                 ++i;
1086
1087         return i;
1088 }
1089
1090 unsigned int cxgbi_sock_select_mss(struct cxgbi_sock *csk, unsigned int pmtu)
1091 {
1092         unsigned int idx;
1093         struct dst_entry *dst = csk->dst;
1094
1095         csk->advmss = dst_metric_advmss(dst);
1096
1097         if (csk->advmss > pmtu - 40)
1098                 csk->advmss = pmtu - 40;
1099         if (csk->advmss < csk->cdev->mtus[0] - 40)
1100                 csk->advmss = csk->cdev->mtus[0] - 40;
1101         idx = cxgbi_sock_find_best_mtu(csk, csk->advmss + 40);
1102
1103         return idx;
1104 }
1105 EXPORT_SYMBOL_GPL(cxgbi_sock_select_mss);
1106
1107 void cxgbi_sock_skb_entail(struct cxgbi_sock *csk, struct sk_buff *skb)
1108 {
1109         cxgbi_skcb_tcp_seq(skb) = csk->write_seq;
1110         __skb_queue_tail(&csk->write_queue, skb);
1111 }
1112 EXPORT_SYMBOL_GPL(cxgbi_sock_skb_entail);
1113
1114 void cxgbi_sock_purge_wr_queue(struct cxgbi_sock *csk)
1115 {
1116         struct sk_buff *skb;
1117
1118         while ((skb = cxgbi_sock_dequeue_wr(csk)) != NULL)
1119                 kfree_skb(skb);
1120 }
1121 EXPORT_SYMBOL_GPL(cxgbi_sock_purge_wr_queue);
1122
1123 void cxgbi_sock_check_wr_invariants(const struct cxgbi_sock *csk)
1124 {
1125         int pending = cxgbi_sock_count_pending_wrs(csk);
1126
1127         if (unlikely(csk->wr_cred + pending != csk->wr_max_cred))
1128                 pr_err("csk 0x%p, tid %u, credit %u + %u != %u.\n",
1129                         csk, csk->tid, csk->wr_cred, pending, csk->wr_max_cred);
1130 }
1131 EXPORT_SYMBOL_GPL(cxgbi_sock_check_wr_invariants);
1132
1133 static int cxgbi_sock_send_pdus(struct cxgbi_sock *csk, struct sk_buff *skb)
1134 {
1135         struct cxgbi_device *cdev = csk->cdev;
1136         struct sk_buff *next;
1137         int err, copied = 0;
1138
1139         spin_lock_bh(&csk->lock);
1140
1141         if (csk->state != CTP_ESTABLISHED) {
1142                 log_debug(1 << CXGBI_DBG_PDU_TX,
1143                         "csk 0x%p,%u,0x%lx,%u, EAGAIN.\n",
1144                         csk, csk->state, csk->flags, csk->tid);
1145                 err = -EAGAIN;
1146                 goto out_err;
1147         }
1148
1149         if (csk->err) {
1150                 log_debug(1 << CXGBI_DBG_PDU_TX,
1151                         "csk 0x%p,%u,0x%lx,%u, EPIPE %d.\n",
1152                         csk, csk->state, csk->flags, csk->tid, csk->err);
1153                 err = -EPIPE;
1154                 goto out_err;
1155         }
1156
1157         if (csk->write_seq - csk->snd_una >= csk->snd_win) {
1158                 log_debug(1 << CXGBI_DBG_PDU_TX,
1159                         "csk 0x%p,%u,0x%lx,%u, FULL %u-%u >= %u.\n",
1160                         csk, csk->state, csk->flags, csk->tid, csk->write_seq,
1161                         csk->snd_una, csk->snd_win);
1162                 err = -ENOBUFS;
1163                 goto out_err;
1164         }
1165
1166         while (skb) {
1167                 int frags = skb_shinfo(skb)->nr_frags +
1168                                 (skb->len != skb->data_len);
1169
1170                 if (unlikely(skb_headroom(skb) < cdev->skb_tx_rsvd)) {
1171                         pr_err("csk 0x%p, skb head %u < %u.\n",
1172                                 csk, skb_headroom(skb), cdev->skb_tx_rsvd);
1173                         err = -EINVAL;
1174                         goto out_err;
1175                 }
1176
1177                 if (frags >= SKB_WR_LIST_SIZE) {
1178                         pr_err("csk 0x%p, frags %d, %u,%u >%u.\n",
1179                                 csk, skb_shinfo(skb)->nr_frags, skb->len,
1180                                 skb->data_len, (uint)(SKB_WR_LIST_SIZE));
1181                         err = -EINVAL;
1182                         goto out_err;
1183                 }
1184
1185                 next = skb->next;
1186                 skb->next = NULL;
1187                 cxgbi_skcb_set_flag(skb, SKCBF_TX_NEED_HDR);
1188                 cxgbi_sock_skb_entail(csk, skb);
1189                 copied += skb->len;
1190                 csk->write_seq += skb->len +
1191                                 cxgbi_ulp_extra_len(cxgbi_skcb_ulp_mode(skb));
1192                 skb = next;
1193         }
1194
1195         if (likely(skb_queue_len(&csk->write_queue)))
1196                 cdev->csk_push_tx_frames(csk, 1);
1197 done:
1198         spin_unlock_bh(&csk->lock);
1199         return copied;
1200
1201 out_err:
1202         if (copied == 0 && err == -EPIPE)
1203                 copied = csk->err ? csk->err : -EPIPE;
1204         else
1205                 copied = err;
1206         goto done;
1207 }
1208
1209 static inline void
1210 scmd_get_params(struct scsi_cmnd *sc, struct scatterlist **sgl,
1211                 unsigned int *sgcnt, unsigned int *dlen,
1212                 unsigned int prot)
1213 {
1214         struct scsi_data_buffer *sdb = prot ? scsi_prot(sc) : scsi_out(sc);
1215
1216         *sgl = sdb->table.sgl;
1217         *sgcnt = sdb->table.nents;
1218         *dlen = sdb->length;
1219         /* Caution: for protection sdb, sdb->length is invalid */
1220 }
1221
1222 void cxgbi_ddp_set_one_ppod(struct cxgbi_pagepod *ppod,
1223                             struct cxgbi_task_tag_info *ttinfo,
1224                             struct scatterlist **sg_pp, unsigned int *sg_off)
1225 {
1226         struct scatterlist *sg = sg_pp ? *sg_pp : NULL;
1227         unsigned int offset = sg_off ? *sg_off : 0;
1228         dma_addr_t addr = 0UL;
1229         unsigned int len = 0;
1230         int i;
1231
1232         memcpy(ppod, &ttinfo->hdr, sizeof(struct cxgbi_pagepod_hdr));
1233
1234         if (sg) {
1235                 addr = sg_dma_address(sg);
1236                 len = sg_dma_len(sg);
1237         }
1238
1239         for (i = 0; i < PPOD_PAGES_MAX; i++) {
1240                 if (sg) {
1241                         ppod->addr[i] = cpu_to_be64(addr + offset);
1242                         offset += PAGE_SIZE;
1243                         if (offset == (len + sg->offset)) {
1244                                 offset = 0;
1245                                 sg = sg_next(sg);
1246                                 if (sg) {
1247                                         addr = sg_dma_address(sg);
1248                                         len = sg_dma_len(sg);
1249                                 }
1250                         }
1251                 } else {
1252                         ppod->addr[i] = 0ULL;
1253                 }
1254         }
1255
1256         /*
1257          * the fifth address needs to be repeated in the next ppod, so do
1258          * not move sg
1259          */
1260         if (sg_pp) {
1261                 *sg_pp = sg;
1262                 *sg_off = offset;
1263         }
1264
1265         if (offset == len) {
1266                 offset = 0;
1267                 sg = sg_next(sg);
1268                 if (sg) {
1269                         addr = sg_dma_address(sg);
1270                         len = sg_dma_len(sg);
1271                 }
1272         }
1273         ppod->addr[i] = sg ? cpu_to_be64(addr + offset) : 0ULL;
1274 }
1275 EXPORT_SYMBOL_GPL(cxgbi_ddp_set_one_ppod);
1276
1277 /*
1278  * APIs interacting with open-iscsi libraries
1279  */
1280
1281 static unsigned char padding[4];
1282
1283 void cxgbi_ddp_ppm_setup(void **ppm_pp, struct cxgbi_device *cdev,
1284                          struct cxgbi_tag_format *tformat, unsigned int ppmax,
1285                          unsigned int llimit, unsigned int start,
1286                          unsigned int rsvd_factor)
1287 {
1288         int err = cxgbi_ppm_init(ppm_pp, cdev->ports[0], cdev->pdev,
1289                                 cdev->lldev, tformat, ppmax, llimit, start,
1290                                 rsvd_factor);
1291
1292         if (err >= 0) {
1293                 struct cxgbi_ppm *ppm = (struct cxgbi_ppm *)(*ppm_pp);
1294
1295                 if (ppm->ppmax < 1024 ||
1296                     ppm->tformat.pgsz_idx_dflt >= DDP_PGIDX_MAX)
1297                         cdev->flags |= CXGBI_FLAG_DDP_OFF;
1298                 err = 0;
1299         } else {
1300                 cdev->flags |= CXGBI_FLAG_DDP_OFF;
1301         }
1302 }
1303 EXPORT_SYMBOL_GPL(cxgbi_ddp_ppm_setup);
1304
1305 static int cxgbi_ddp_sgl_check(struct scatterlist *sgl, int nents)
1306 {
1307         int i;
1308         int last_sgidx = nents - 1;
1309         struct scatterlist *sg = sgl;
1310
1311         for (i = 0; i < nents; i++, sg = sg_next(sg)) {
1312                 unsigned int len = sg->length + sg->offset;
1313
1314                 if ((sg->offset & 0x3) || (i && sg->offset) ||
1315                     ((i != last_sgidx) && len != PAGE_SIZE)) {
1316                         log_debug(1 << CXGBI_DBG_DDP,
1317                                   "sg %u/%u, %u,%u, not aligned.\n",
1318                                   i, nents, sg->offset, sg->length);
1319                         goto err_out;
1320                 }
1321         }
1322         return 0;
1323 err_out:
1324         return -EINVAL;
1325 }
1326
1327 static int cxgbi_ddp_reserve(struct cxgbi_conn *cconn,
1328                              struct cxgbi_task_data *tdata, u32 sw_tag,
1329                              unsigned int xferlen)
1330 {
1331         struct cxgbi_sock *csk = cconn->cep->csk;
1332         struct cxgbi_device *cdev = csk->cdev;
1333         struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
1334         struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
1335         struct scatterlist *sgl = ttinfo->sgl;
1336         unsigned int sgcnt = ttinfo->nents;
1337         unsigned int sg_offset = sgl->offset;
1338         int err;
1339
1340         if (cdev->flags & CXGBI_FLAG_DDP_OFF) {
1341                 log_debug(1 << CXGBI_DBG_DDP,
1342                           "cdev 0x%p DDP off.\n", cdev);
1343                 return -EINVAL;
1344         }
1345
1346         if (!ppm || xferlen < DDP_THRESHOLD || !sgcnt ||
1347             ppm->tformat.pgsz_idx_dflt >= DDP_PGIDX_MAX) {
1348                 log_debug(1 << CXGBI_DBG_DDP,
1349                           "ppm 0x%p, pgidx %u, xfer %u, sgcnt %u, NO ddp.\n",
1350                           ppm, ppm ? ppm->tformat.pgsz_idx_dflt : DDP_PGIDX_MAX,
1351                           xferlen, ttinfo->nents);
1352                 return -EINVAL;
1353         }
1354
1355         /* make sure the buffer is suitable for ddp */
1356         if (cxgbi_ddp_sgl_check(sgl, sgcnt) < 0)
1357                 return -EINVAL;
1358
1359         ttinfo->nr_pages = (xferlen + sgl->offset + (1 << PAGE_SHIFT) - 1) >>
1360                             PAGE_SHIFT;
1361
1362         /*
1363          * the ddp tag will be used for the itt in the outgoing pdu,
1364          * the itt genrated by libiscsi is saved in the ppm and can be
1365          * retrieved via the ddp tag
1366          */
1367         err = cxgbi_ppm_ppods_reserve(ppm, ttinfo->nr_pages, 0, &ttinfo->idx,
1368                                       &ttinfo->tag, (unsigned long)sw_tag);
1369         if (err < 0) {
1370                 cconn->ddp_full++;
1371                 return err;
1372         }
1373         ttinfo->npods = err;
1374
1375          /* setup dma from scsi command sgl */
1376         sgl->offset = 0;
1377         err = dma_map_sg(&ppm->pdev->dev, sgl, sgcnt, DMA_FROM_DEVICE);
1378         sgl->offset = sg_offset;
1379         if (err == 0) {
1380                 pr_info("%s: 0x%x, xfer %u, sgl %u dma mapping err.\n",
1381                         __func__, sw_tag, xferlen, sgcnt);
1382                 goto rel_ppods;
1383         }
1384         if (err != ttinfo->nr_pages) {
1385                 log_debug(1 << CXGBI_DBG_DDP,
1386                           "%s: sw tag 0x%x, xfer %u, sgl %u, dma count %d.\n",
1387                           __func__, sw_tag, xferlen, sgcnt, err);
1388         }
1389
1390         ttinfo->flags |= CXGBI_PPOD_INFO_FLAG_MAPPED;
1391         ttinfo->cid = csk->port_id;
1392
1393         cxgbi_ppm_make_ppod_hdr(ppm, ttinfo->tag, csk->tid, sgl->offset,
1394                                 xferlen, &ttinfo->hdr);
1395
1396         if (cdev->flags & CXGBI_FLAG_USE_PPOD_OFLDQ) {
1397                 /* write ppod from xmit_pdu (of iscsi_scsi_command pdu) */
1398                 ttinfo->flags |= CXGBI_PPOD_INFO_FLAG_VALID;
1399         } else {
1400                 /* write ppod from control queue now */
1401                 err = cdev->csk_ddp_set_map(ppm, csk, ttinfo);
1402                 if (err < 0)
1403                         goto rel_ppods;
1404         }
1405
1406         return 0;
1407
1408 rel_ppods:
1409         cxgbi_ppm_ppod_release(ppm, ttinfo->idx);
1410
1411         if (ttinfo->flags & CXGBI_PPOD_INFO_FLAG_MAPPED) {
1412                 ttinfo->flags &= ~CXGBI_PPOD_INFO_FLAG_MAPPED;
1413                 dma_unmap_sg(&ppm->pdev->dev, sgl, sgcnt, DMA_FROM_DEVICE);
1414         }
1415         return -EINVAL;
1416 }
1417
1418 static void task_release_itt(struct iscsi_task *task, itt_t hdr_itt)
1419 {
1420         struct scsi_cmnd *sc = task->sc;
1421         struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
1422         struct cxgbi_conn *cconn = tcp_conn->dd_data;
1423         struct cxgbi_device *cdev = cconn->chba->cdev;
1424         struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
1425         u32 tag = ntohl((__force u32)hdr_itt);
1426
1427         log_debug(1 << CXGBI_DBG_DDP,
1428                   "cdev 0x%p, task 0x%p, release tag 0x%x.\n",
1429                   cdev, task, tag);
1430         if (sc &&
1431             (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE) &&
1432             cxgbi_ppm_is_ddp_tag(ppm, tag)) {
1433                 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1434                 struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
1435
1436                 if (!(cdev->flags & CXGBI_FLAG_USE_PPOD_OFLDQ))
1437                         cdev->csk_ddp_clear_map(cdev, ppm, ttinfo);
1438                 cxgbi_ppm_ppod_release(ppm, ttinfo->idx);
1439                 dma_unmap_sg(&ppm->pdev->dev, ttinfo->sgl, ttinfo->nents,
1440                              DMA_FROM_DEVICE);
1441         }
1442 }
1443
1444 static inline u32 cxgbi_build_sw_tag(u32 idx, u32 age)
1445 {
1446         /* assume idx and age both are < 0x7FFF (32767) */
1447         return (idx << 16) | age;
1448 }
1449
1450 static int task_reserve_itt(struct iscsi_task *task, itt_t *hdr_itt)
1451 {
1452         struct scsi_cmnd *sc = task->sc;
1453         struct iscsi_conn *conn = task->conn;
1454         struct iscsi_session *sess = conn->session;
1455         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1456         struct cxgbi_conn *cconn = tcp_conn->dd_data;
1457         struct cxgbi_device *cdev = cconn->chba->cdev;
1458         struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
1459         u32 sw_tag = cxgbi_build_sw_tag(task->itt, sess->age);
1460         u32 tag = 0;
1461         int err = -EINVAL;
1462
1463         if (sc &&
1464             (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE)
1465         ) {
1466                 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1467                 struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
1468
1469                 scmd_get_params(sc, &ttinfo->sgl, &ttinfo->nents,
1470                                 &tdata->dlen, 0);
1471                 err = cxgbi_ddp_reserve(cconn, tdata, sw_tag, tdata->dlen);
1472                 if (!err)
1473                         tag = ttinfo->tag;
1474                 else
1475                          log_debug(1 << CXGBI_DBG_DDP,
1476                                    "csk 0x%p, R task 0x%p, %u,%u, no ddp.\n",
1477                                    cconn->cep->csk, task, tdata->dlen,
1478                                    ttinfo->nents);
1479         }
1480
1481         if (err < 0) {
1482                 err = cxgbi_ppm_make_non_ddp_tag(ppm, sw_tag, &tag);
1483                 if (err < 0)
1484                         return err;
1485         }
1486         /*  the itt need to sent in big-endian order */
1487         *hdr_itt = (__force itt_t)htonl(tag);
1488
1489         log_debug(1 << CXGBI_DBG_DDP,
1490                   "cdev 0x%p, task 0x%p, 0x%x(0x%x,0x%x)->0x%x/0x%x.\n",
1491                   cdev, task, sw_tag, task->itt, sess->age, tag, *hdr_itt);
1492         return 0;
1493 }
1494
1495 void cxgbi_parse_pdu_itt(struct iscsi_conn *conn, itt_t itt, int *idx, int *age)
1496 {
1497         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1498         struct cxgbi_conn *cconn = tcp_conn->dd_data;
1499         struct cxgbi_device *cdev = cconn->chba->cdev;
1500         struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
1501         u32 tag = ntohl((__force u32)itt);
1502         u32 sw_bits;
1503
1504         if (ppm) {
1505                 if (cxgbi_ppm_is_ddp_tag(ppm, tag))
1506                         sw_bits = cxgbi_ppm_get_tag_caller_data(ppm, tag);
1507                 else
1508                         sw_bits = cxgbi_ppm_decode_non_ddp_tag(ppm, tag);
1509         } else {
1510                 sw_bits = tag;
1511         }
1512
1513         cxgbi_decode_sw_tag(sw_bits, idx, age);
1514         log_debug(1 << CXGBI_DBG_DDP,
1515                   "cdev 0x%p, tag 0x%x/0x%x, -> 0x%x(0x%x,0x%x).\n",
1516                   cdev, tag, itt, sw_bits, idx ? *idx : 0xFFFFF,
1517                   age ? *age : 0xFF);
1518 }
1519 EXPORT_SYMBOL_GPL(cxgbi_parse_pdu_itt);
1520
1521 void cxgbi_conn_tx_open(struct cxgbi_sock *csk)
1522 {
1523         struct iscsi_conn *conn = csk->user_data;
1524
1525         if (conn) {
1526                 log_debug(1 << CXGBI_DBG_SOCK,
1527                         "csk 0x%p, cid %d.\n", csk, conn->id);
1528                 iscsi_conn_queue_work(conn);
1529         }
1530 }
1531 EXPORT_SYMBOL_GPL(cxgbi_conn_tx_open);
1532
1533 /*
1534  * pdu receive, interact with libiscsi_tcp
1535  */
1536 static inline int read_pdu_skb(struct iscsi_conn *conn,
1537                                struct sk_buff *skb,
1538                                unsigned int offset,
1539                                int offloaded)
1540 {
1541         int status = 0;
1542         int bytes_read;
1543
1544         bytes_read = iscsi_tcp_recv_skb(conn, skb, offset, offloaded, &status);
1545         switch (status) {
1546         case ISCSI_TCP_CONN_ERR:
1547                 pr_info("skb 0x%p, off %u, %d, TCP_ERR.\n",
1548                           skb, offset, offloaded);
1549                 return -EIO;
1550         case ISCSI_TCP_SUSPENDED:
1551                 log_debug(1 << CXGBI_DBG_PDU_RX,
1552                         "skb 0x%p, off %u, %d, TCP_SUSPEND, rc %d.\n",
1553                         skb, offset, offloaded, bytes_read);
1554                 /* no transfer - just have caller flush queue */
1555                 return bytes_read;
1556         case ISCSI_TCP_SKB_DONE:
1557                 pr_info("skb 0x%p, off %u, %d, TCP_SKB_DONE.\n",
1558                         skb, offset, offloaded);
1559                 /*
1560                  * pdus should always fit in the skb and we should get
1561                  * segment done notifcation.
1562                  */
1563                 iscsi_conn_printk(KERN_ERR, conn, "Invalid pdu or skb.");
1564                 return -EFAULT;
1565         case ISCSI_TCP_SEGMENT_DONE:
1566                 log_debug(1 << CXGBI_DBG_PDU_RX,
1567                         "skb 0x%p, off %u, %d, TCP_SEG_DONE, rc %d.\n",
1568                         skb, offset, offloaded, bytes_read);
1569                 return bytes_read;
1570         default:
1571                 pr_info("skb 0x%p, off %u, %d, invalid status %d.\n",
1572                         skb, offset, offloaded, status);
1573                 return -EINVAL;
1574         }
1575 }
1576
1577 static int
1578 skb_read_pdu_bhs(struct cxgbi_sock *csk, struct iscsi_conn *conn,
1579                  struct sk_buff *skb)
1580 {
1581         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1582         int err;
1583
1584         log_debug(1 << CXGBI_DBG_PDU_RX,
1585                 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1586                 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1587
1588         if (!iscsi_tcp_recv_segment_is_hdr(tcp_conn)) {
1589                 pr_info("conn 0x%p, skb 0x%p, not hdr.\n", conn, skb);
1590                 iscsi_conn_failure(conn, ISCSI_ERR_PROTO);
1591                 return -EIO;
1592         }
1593
1594         if (conn->hdrdgst_en &&
1595             cxgbi_skcb_test_flag(skb, SKCBF_RX_HCRC_ERR)) {
1596                 pr_info("conn 0x%p, skb 0x%p, hcrc.\n", conn, skb);
1597                 iscsi_conn_failure(conn, ISCSI_ERR_HDR_DGST);
1598                 return -EIO;
1599         }
1600
1601         if (cxgbi_skcb_test_flag(skb, SKCBF_RX_ISCSI_COMPL) &&
1602             cxgbi_skcb_test_flag(skb, SKCBF_RX_DATA_DDPD)) {
1603                 /* If completion flag is set and data is directly
1604                  * placed in to the host memory then update
1605                  * task->exp_datasn to the datasn in completion
1606                  * iSCSI hdr as T6 adapter generates completion only
1607                  * for the last pdu of a sequence.
1608                  */
1609                 itt_t itt = ((struct iscsi_data *)skb->data)->itt;
1610                 struct iscsi_task *task = iscsi_itt_to_ctask(conn, itt);
1611                 u32 data_sn = be32_to_cpu(((struct iscsi_data *)
1612                                                         skb->data)->datasn);
1613                 if (task && task->sc) {
1614                         struct iscsi_tcp_task *tcp_task = task->dd_data;
1615
1616                         tcp_task->exp_datasn = data_sn;
1617                 }
1618         }
1619
1620         err = read_pdu_skb(conn, skb, 0, 0);
1621         if (likely(err >= 0)) {
1622                 struct iscsi_hdr *hdr = (struct iscsi_hdr *)skb->data;
1623                 u8 opcode = hdr->opcode & ISCSI_OPCODE_MASK;
1624
1625                 if (unlikely(opcode == ISCSI_OP_LOGOUT_RSP))
1626                         cxgbi_sock_set_flag(csk, CTPF_LOGOUT_RSP_RCVD);
1627         }
1628
1629         return err;
1630 }
1631
1632 static int skb_read_pdu_data(struct iscsi_conn *conn, struct sk_buff *lskb,
1633                              struct sk_buff *skb, unsigned int offset)
1634 {
1635         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1636         bool offloaded = 0;
1637         int opcode = tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK;
1638
1639         log_debug(1 << CXGBI_DBG_PDU_RX,
1640                 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1641                 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1642
1643         if (conn->datadgst_en &&
1644             cxgbi_skcb_test_flag(lskb, SKCBF_RX_DCRC_ERR)) {
1645                 pr_info("conn 0x%p, skb 0x%p, dcrc 0x%lx.\n",
1646                         conn, lskb, cxgbi_skcb_flags(lskb));
1647                 iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST);
1648                 return -EIO;
1649         }
1650
1651         if (iscsi_tcp_recv_segment_is_hdr(tcp_conn))
1652                 return 0;
1653
1654         /* coalesced, add header digest length */
1655         if (lskb == skb && conn->hdrdgst_en)
1656                 offset += ISCSI_DIGEST_SIZE;
1657
1658         if (cxgbi_skcb_test_flag(lskb, SKCBF_RX_DATA_DDPD))
1659                 offloaded = 1;
1660
1661         if (opcode == ISCSI_OP_SCSI_DATA_IN)
1662                 log_debug(1 << CXGBI_DBG_PDU_RX,
1663                         "skb 0x%p, op 0x%x, itt 0x%x, %u %s ddp'ed.\n",
1664                         skb, opcode, ntohl(tcp_conn->in.hdr->itt),
1665                         tcp_conn->in.datalen, offloaded ? "is" : "not");
1666
1667         return read_pdu_skb(conn, skb, offset, offloaded);
1668 }
1669
1670 static void csk_return_rx_credits(struct cxgbi_sock *csk, int copied)
1671 {
1672         struct cxgbi_device *cdev = csk->cdev;
1673         int must_send;
1674         u32 credits;
1675
1676         log_debug(1 << CXGBI_DBG_PDU_RX,
1677                 "csk 0x%p,%u,0x%lx,%u, seq %u, wup %u, thre %u, %u.\n",
1678                 csk, csk->state, csk->flags, csk->tid, csk->copied_seq,
1679                 csk->rcv_wup, cdev->rx_credit_thres,
1680                 csk->rcv_win);
1681
1682         if (!cdev->rx_credit_thres)
1683                 return;
1684
1685         if (csk->state != CTP_ESTABLISHED)
1686                 return;
1687
1688         credits = csk->copied_seq - csk->rcv_wup;
1689         if (unlikely(!credits))
1690                 return;
1691         must_send = credits + 16384 >= csk->rcv_win;
1692         if (must_send || credits >= cdev->rx_credit_thres)
1693                 csk->rcv_wup += cdev->csk_send_rx_credits(csk, credits);
1694 }
1695
1696 void cxgbi_conn_pdu_ready(struct cxgbi_sock *csk)
1697 {
1698         struct cxgbi_device *cdev = csk->cdev;
1699         struct iscsi_conn *conn = csk->user_data;
1700         struct sk_buff *skb;
1701         unsigned int read = 0;
1702         int err = 0;
1703
1704         log_debug(1 << CXGBI_DBG_PDU_RX,
1705                 "csk 0x%p, conn 0x%p.\n", csk, conn);
1706
1707         if (unlikely(!conn || conn->suspend_rx)) {
1708                 log_debug(1 << CXGBI_DBG_PDU_RX,
1709                         "csk 0x%p, conn 0x%p, id %d, suspend_rx %lu!\n",
1710                         csk, conn, conn ? conn->id : 0xFF,
1711                         conn ? conn->suspend_rx : 0xFF);
1712                 return;
1713         }
1714
1715         while (!err) {
1716                 skb = skb_peek(&csk->receive_queue);
1717                 if (!skb ||
1718                     !(cxgbi_skcb_test_flag(skb, SKCBF_RX_STATUS))) {
1719                         if (skb)
1720                                 log_debug(1 << CXGBI_DBG_PDU_RX,
1721                                         "skb 0x%p, NOT ready 0x%lx.\n",
1722                                         skb, cxgbi_skcb_flags(skb));
1723                         break;
1724                 }
1725                 __skb_unlink(skb, &csk->receive_queue);
1726
1727                 read += cxgbi_skcb_rx_pdulen(skb);
1728                 log_debug(1 << CXGBI_DBG_PDU_RX,
1729                         "csk 0x%p, skb 0x%p,%u,f 0x%lx, pdu len %u.\n",
1730                         csk, skb, skb->len, cxgbi_skcb_flags(skb),
1731                         cxgbi_skcb_rx_pdulen(skb));
1732
1733                 if (cxgbi_skcb_test_flag(skb, SKCBF_RX_COALESCED)) {
1734                         err = skb_read_pdu_bhs(csk, conn, skb);
1735                         if (err < 0) {
1736                                 pr_err("coalesced bhs, csk 0x%p, skb 0x%p,%u, "
1737                                         "f 0x%lx, plen %u.\n",
1738                                         csk, skb, skb->len,
1739                                         cxgbi_skcb_flags(skb),
1740                                         cxgbi_skcb_rx_pdulen(skb));
1741                                 goto skb_done;
1742                         }
1743                         err = skb_read_pdu_data(conn, skb, skb,
1744                                                 err + cdev->skb_rx_extra);
1745                         if (err < 0)
1746                                 pr_err("coalesced data, csk 0x%p, skb 0x%p,%u, "
1747                                         "f 0x%lx, plen %u.\n",
1748                                         csk, skb, skb->len,
1749                                         cxgbi_skcb_flags(skb),
1750                                         cxgbi_skcb_rx_pdulen(skb));
1751                 } else {
1752                         err = skb_read_pdu_bhs(csk, conn, skb);
1753                         if (err < 0) {
1754                                 pr_err("bhs, csk 0x%p, skb 0x%p,%u, "
1755                                         "f 0x%lx, plen %u.\n",
1756                                         csk, skb, skb->len,
1757                                         cxgbi_skcb_flags(skb),
1758                                         cxgbi_skcb_rx_pdulen(skb));
1759                                 goto skb_done;
1760                         }
1761
1762                         if (cxgbi_skcb_test_flag(skb, SKCBF_RX_DATA)) {
1763                                 struct sk_buff *dskb;
1764
1765                                 dskb = skb_peek(&csk->receive_queue);
1766                                 if (!dskb) {
1767                                         pr_err("csk 0x%p, skb 0x%p,%u, f 0x%lx,"
1768                                                 " plen %u, NO data.\n",
1769                                                 csk, skb, skb->len,
1770                                                 cxgbi_skcb_flags(skb),
1771                                                 cxgbi_skcb_rx_pdulen(skb));
1772                                         err = -EIO;
1773                                         goto skb_done;
1774                                 }
1775                                 __skb_unlink(dskb, &csk->receive_queue);
1776
1777                                 err = skb_read_pdu_data(conn, skb, dskb, 0);
1778                                 if (err < 0)
1779                                         pr_err("data, csk 0x%p, skb 0x%p,%u, "
1780                                                 "f 0x%lx, plen %u, dskb 0x%p,"
1781                                                 "%u.\n",
1782                                                 csk, skb, skb->len,
1783                                                 cxgbi_skcb_flags(skb),
1784                                                 cxgbi_skcb_rx_pdulen(skb),
1785                                                 dskb, dskb->len);
1786                                 __kfree_skb(dskb);
1787                         } else
1788                                 err = skb_read_pdu_data(conn, skb, skb, 0);
1789                 }
1790 skb_done:
1791                 __kfree_skb(skb);
1792
1793                 if (err < 0)
1794                         break;
1795         }
1796
1797         log_debug(1 << CXGBI_DBG_PDU_RX, "csk 0x%p, read %u.\n", csk, read);
1798         if (read) {
1799                 csk->copied_seq += read;
1800                 csk_return_rx_credits(csk, read);
1801                 conn->rxdata_octets += read;
1802         }
1803
1804         if (err < 0) {
1805                 pr_info("csk 0x%p, 0x%p, rx failed %d, read %u.\n",
1806                         csk, conn, err, read);
1807                 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1808         }
1809 }
1810 EXPORT_SYMBOL_GPL(cxgbi_conn_pdu_ready);
1811
1812 static int sgl_seek_offset(struct scatterlist *sgl, unsigned int sgcnt,
1813                                 unsigned int offset, unsigned int *off,
1814                                 struct scatterlist **sgp)
1815 {
1816         int i;
1817         struct scatterlist *sg;
1818
1819         for_each_sg(sgl, sg, sgcnt, i) {
1820                 if (offset < sg->length) {
1821                         *off = offset;
1822                         *sgp = sg;
1823                         return 0;
1824                 }
1825                 offset -= sg->length;
1826         }
1827         return -EFAULT;
1828 }
1829
1830 static int sgl_read_to_frags(struct scatterlist *sg, unsigned int sgoffset,
1831                                 unsigned int dlen, struct page_frag *frags,
1832                                 int frag_max)
1833 {
1834         unsigned int datalen = dlen;
1835         unsigned int sglen = sg->length - sgoffset;
1836         struct page *page = sg_page(sg);
1837         int i;
1838
1839         i = 0;
1840         do {
1841                 unsigned int copy;
1842
1843                 if (!sglen) {
1844                         sg = sg_next(sg);
1845                         if (!sg) {
1846                                 pr_warn("sg %d NULL, len %u/%u.\n",
1847                                         i, datalen, dlen);
1848                                 return -EINVAL;
1849                         }
1850                         sgoffset = 0;
1851                         sglen = sg->length;
1852                         page = sg_page(sg);
1853
1854                 }
1855                 copy = min(datalen, sglen);
1856                 if (i && page == frags[i - 1].page &&
1857                     sgoffset + sg->offset ==
1858                         frags[i - 1].offset + frags[i - 1].size) {
1859                         frags[i - 1].size += copy;
1860                 } else {
1861                         if (i >= frag_max) {
1862                                 pr_warn("too many pages %u, dlen %u.\n",
1863                                         frag_max, dlen);
1864                                 return -EINVAL;
1865                         }
1866
1867                         frags[i].page = page;
1868                         frags[i].offset = sg->offset + sgoffset;
1869                         frags[i].size = copy;
1870                         i++;
1871                 }
1872                 datalen -= copy;
1873                 sgoffset += copy;
1874                 sglen -= copy;
1875         } while (datalen);
1876
1877         return i;
1878 }
1879
1880 int cxgbi_conn_alloc_pdu(struct iscsi_task *task, u8 opcode)
1881 {
1882         struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
1883         struct cxgbi_conn *cconn = tcp_conn->dd_data;
1884         struct cxgbi_device *cdev = cconn->chba->cdev;
1885         struct iscsi_conn *conn = task->conn;
1886         struct iscsi_tcp_task *tcp_task = task->dd_data;
1887         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1888         struct scsi_cmnd *sc = task->sc;
1889         struct cxgbi_sock *csk = cconn->cep->csk;
1890         struct net_device *ndev = cdev->ports[csk->port_id];
1891         int headroom = SKB_TX_ISCSI_PDU_HEADER_MAX;
1892
1893         tcp_task->dd_data = tdata;
1894         task->hdr = NULL;
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                 ndev->stats.tx_dropped++;
1908                 return -ENOMEM;
1909         }
1910
1911         skb_reserve(tdata->skb, cdev->skb_tx_rsvd);
1912
1913         if (task->sc) {
1914                 task->hdr = (struct iscsi_hdr *)tdata->skb->data;
1915         } else {
1916                 task->hdr = kzalloc(SKB_TX_ISCSI_PDU_HEADER_MAX, GFP_ATOMIC);
1917                 if (!task->hdr) {
1918                         __kfree_skb(tdata->skb);
1919                         tdata->skb = NULL;
1920                         ndev->stats.tx_dropped++;
1921                         return -ENOMEM;
1922                 }
1923         }
1924         task->hdr_max = SKB_TX_ISCSI_PDU_HEADER_MAX; /* BHS + AHS */
1925
1926         /* data_out uses scsi_cmd's itt */
1927         if (opcode != ISCSI_OP_SCSI_DATA_OUT)
1928                 task_reserve_itt(task, &task->hdr->itt);
1929
1930         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
1931                 "task 0x%p, op 0x%x, skb 0x%p,%u+%u/%u, itt 0x%x.\n",
1932                 task, opcode, tdata->skb, cdev->skb_tx_rsvd, headroom,
1933                 conn->max_xmit_dlength, ntohl(task->hdr->itt));
1934
1935         return 0;
1936 }
1937 EXPORT_SYMBOL_GPL(cxgbi_conn_alloc_pdu);
1938
1939 static inline void tx_skb_setmode(struct sk_buff *skb, int hcrc, int dcrc)
1940 {
1941         if (hcrc || dcrc) {
1942                 u8 submode = 0;
1943
1944                 if (hcrc)
1945                         submode |= 1;
1946                 if (dcrc)
1947                         submode |= 2;
1948                 cxgbi_skcb_ulp_mode(skb) = (ULP2_MODE_ISCSI << 4) | submode;
1949         } else
1950                 cxgbi_skcb_ulp_mode(skb) = 0;
1951 }
1952
1953 int cxgbi_conn_init_pdu(struct iscsi_task *task, unsigned int offset,
1954                               unsigned int count)
1955 {
1956         struct iscsi_conn *conn = task->conn;
1957         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1958         struct sk_buff *skb = tdata->skb;
1959         unsigned int datalen = count;
1960         int i, padlen = iscsi_padding(count);
1961         struct page *pg;
1962
1963         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
1964                 "task 0x%p,0x%p, skb 0x%p, 0x%x,0x%x,0x%x, %u+%u.\n",
1965                 task, task->sc, skb, (*skb->data) & ISCSI_OPCODE_MASK,
1966                 ntohl(task->cmdsn), ntohl(task->hdr->itt), offset, count);
1967
1968         skb_put(skb, task->hdr_len);
1969         tx_skb_setmode(skb, conn->hdrdgst_en, datalen ? conn->datadgst_en : 0);
1970         if (!count)
1971                 return 0;
1972
1973         if (task->sc) {
1974                 struct scsi_data_buffer *sdb = scsi_out(task->sc);
1975                 struct scatterlist *sg = NULL;
1976                 int err;
1977
1978                 tdata->offset = offset;
1979                 tdata->count = count;
1980                 err = sgl_seek_offset(
1981                                         sdb->table.sgl, sdb->table.nents,
1982                                         tdata->offset, &tdata->sgoffset, &sg);
1983                 if (err < 0) {
1984                         pr_warn("tpdu, sgl %u, bad offset %u/%u.\n",
1985                                 sdb->table.nents, tdata->offset, sdb->length);
1986                         return err;
1987                 }
1988                 err = sgl_read_to_frags(sg, tdata->sgoffset, tdata->count,
1989                                         tdata->frags, MAX_PDU_FRAGS);
1990                 if (err < 0) {
1991                         pr_warn("tpdu, sgl %u, bad offset %u + %u.\n",
1992                                 sdb->table.nents, tdata->offset, tdata->count);
1993                         return err;
1994                 }
1995                 tdata->nr_frags = err;
1996
1997                 if (tdata->nr_frags > MAX_SKB_FRAGS ||
1998                     (padlen && tdata->nr_frags == MAX_SKB_FRAGS)) {
1999                         char *dst = skb->data + task->hdr_len;
2000                         struct page_frag *frag = tdata->frags;
2001
2002                         /* data fits in the skb's headroom */
2003                         for (i = 0; i < tdata->nr_frags; i++, frag++) {
2004                                 char *src = kmap_atomic(frag->page);
2005
2006                                 memcpy(dst, src+frag->offset, frag->size);
2007                                 dst += frag->size;
2008                                 kunmap_atomic(src);
2009                         }
2010                         if (padlen) {
2011                                 memset(dst, 0, padlen);
2012                                 padlen = 0;
2013                         }
2014                         skb_put(skb, count + padlen);
2015                 } else {
2016                         /* data fit into frag_list */
2017                         for (i = 0; i < tdata->nr_frags; i++) {
2018                                 __skb_fill_page_desc(skb, i,
2019                                                 tdata->frags[i].page,
2020                                                 tdata->frags[i].offset,
2021                                                 tdata->frags[i].size);
2022                                 skb_frag_ref(skb, i);
2023                         }
2024                         skb_shinfo(skb)->nr_frags = tdata->nr_frags;
2025                         skb->len += count;
2026                         skb->data_len += count;
2027                         skb->truesize += count;
2028                 }
2029
2030         } else {
2031                 pg = virt_to_page(task->data);
2032
2033                 get_page(pg);
2034                 skb_fill_page_desc(skb, 0, pg, offset_in_page(task->data),
2035                                         count);
2036                 skb->len += count;
2037                 skb->data_len += count;
2038                 skb->truesize += count;
2039         }
2040
2041         if (padlen) {
2042                 i = skb_shinfo(skb)->nr_frags;
2043                 skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags,
2044                                 virt_to_page(padding), offset_in_page(padding),
2045                                 padlen);
2046
2047                 skb->data_len += padlen;
2048                 skb->truesize += padlen;
2049                 skb->len += padlen;
2050         }
2051
2052         return 0;
2053 }
2054 EXPORT_SYMBOL_GPL(cxgbi_conn_init_pdu);
2055
2056 int cxgbi_conn_xmit_pdu(struct iscsi_task *task)
2057 {
2058         struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
2059         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2060         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2061         struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
2062         struct sk_buff *skb = tdata->skb;
2063         struct cxgbi_sock *csk = NULL;
2064         unsigned int datalen;
2065         int err;
2066
2067         if (!skb) {
2068                 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2069                         "task 0x%p\n", task);
2070                 return 0;
2071         }
2072
2073         if (cconn && cconn->cep)
2074                 csk = cconn->cep->csk;
2075         if (!csk) {
2076                 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2077                           "task 0x%p, csk gone.\n", task);
2078                 return -EPIPE;
2079         }
2080
2081         tdata->skb = NULL;
2082         datalen = skb->data_len;
2083
2084         /* write ppod first if using ofldq to write ppod */
2085         if (ttinfo->flags & CXGBI_PPOD_INFO_FLAG_VALID) {
2086                 struct cxgbi_ppm *ppm = csk->cdev->cdev2ppm(csk->cdev);
2087
2088                 ttinfo->flags &= ~CXGBI_PPOD_INFO_FLAG_VALID;
2089                 if (csk->cdev->csk_ddp_set_map(ppm, csk, ttinfo) < 0)
2090                         pr_err("task 0x%p, ppod writing using ofldq failed.\n",
2091                                task);
2092                         /* continue. Let fl get the data */
2093         }
2094
2095         if (!task->sc)
2096                 memcpy(skb->data, task->hdr, SKB_TX_ISCSI_PDU_HEADER_MAX);
2097
2098         err = cxgbi_sock_send_pdus(cconn->cep->csk, skb);
2099         if (err > 0) {
2100                 int pdulen = err;
2101
2102                 log_debug(1 << CXGBI_DBG_PDU_TX,
2103                         "task 0x%p,0x%p, skb 0x%p, len %u/%u, rv %d.\n",
2104                         task, task->sc, skb, skb->len, skb->data_len, err);
2105
2106                 if (task->conn->hdrdgst_en)
2107                         pdulen += ISCSI_DIGEST_SIZE;
2108
2109                 if (datalen && task->conn->datadgst_en)
2110                         pdulen += ISCSI_DIGEST_SIZE;
2111
2112                 task->conn->txdata_octets += pdulen;
2113                 return 0;
2114         }
2115
2116         if (err == -EAGAIN || err == -ENOBUFS) {
2117                 log_debug(1 << CXGBI_DBG_PDU_TX,
2118                         "task 0x%p, skb 0x%p, len %u/%u, %d EAGAIN.\n",
2119                         task, skb, skb->len, skb->data_len, err);
2120                 /* reset skb to send when we are called again */
2121                 tdata->skb = skb;
2122                 return err;
2123         }
2124
2125         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2126                 "itt 0x%x, skb 0x%p, len %u/%u, xmit err %d.\n",
2127                 task->itt, skb, skb->len, skb->data_len, err);
2128
2129         __kfree_skb(skb);
2130
2131         iscsi_conn_printk(KERN_ERR, task->conn, "xmit err %d.\n", err);
2132         iscsi_conn_failure(task->conn, ISCSI_ERR_XMIT_FAILED);
2133         return err;
2134 }
2135 EXPORT_SYMBOL_GPL(cxgbi_conn_xmit_pdu);
2136
2137 void cxgbi_cleanup_task(struct iscsi_task *task)
2138 {
2139         struct iscsi_tcp_task *tcp_task = task->dd_data;
2140         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2141
2142         if (!tcp_task || !tdata || (tcp_task->dd_data != tdata)) {
2143                 pr_info("task 0x%p,0x%p, tcp_task 0x%p, tdata 0x%p/0x%p.\n",
2144                         task, task->sc, tcp_task,
2145                         tcp_task ? tcp_task->dd_data : NULL, tdata);
2146                 return;
2147         }
2148
2149         log_debug(1 << CXGBI_DBG_ISCSI,
2150                 "task 0x%p, skb 0x%p, itt 0x%x.\n",
2151                 task, tdata->skb, task->hdr_itt);
2152
2153         tcp_task->dd_data = NULL;
2154
2155         if (!task->sc)
2156                 kfree(task->hdr);
2157         task->hdr = NULL;
2158
2159         /*  never reached the xmit task callout */
2160         if (tdata->skb) {
2161                 __kfree_skb(tdata->skb);
2162                 tdata->skb = NULL;
2163         }
2164
2165         task_release_itt(task, task->hdr_itt);
2166         memset(tdata, 0, sizeof(*tdata));
2167
2168         iscsi_tcp_cleanup_task(task);
2169 }
2170 EXPORT_SYMBOL_GPL(cxgbi_cleanup_task);
2171
2172 void cxgbi_get_conn_stats(struct iscsi_cls_conn *cls_conn,
2173                                 struct iscsi_stats *stats)
2174 {
2175         struct iscsi_conn *conn = cls_conn->dd_data;
2176
2177         stats->txdata_octets = conn->txdata_octets;
2178         stats->rxdata_octets = conn->rxdata_octets;
2179         stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
2180         stats->dataout_pdus = conn->dataout_pdus_cnt;
2181         stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
2182         stats->datain_pdus = conn->datain_pdus_cnt;
2183         stats->r2t_pdus = conn->r2t_pdus_cnt;
2184         stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
2185         stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
2186         stats->digest_err = 0;
2187         stats->timeout_err = 0;
2188         stats->custom_length = 1;
2189         strcpy(stats->custom[0].desc, "eh_abort_cnt");
2190         stats->custom[0].value = conn->eh_abort_cnt;
2191 }
2192 EXPORT_SYMBOL_GPL(cxgbi_get_conn_stats);
2193
2194 static int cxgbi_conn_max_xmit_dlength(struct iscsi_conn *conn)
2195 {
2196         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2197         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2198         struct cxgbi_device *cdev = cconn->chba->cdev;
2199         unsigned int headroom = SKB_MAX_HEAD(cdev->skb_tx_rsvd);
2200         unsigned int max_def = 512 * MAX_SKB_FRAGS;
2201         unsigned int max = max(max_def, headroom);
2202
2203         max = min(cconn->chba->cdev->tx_max_size, max);
2204         if (conn->max_xmit_dlength)
2205                 conn->max_xmit_dlength = min(conn->max_xmit_dlength, max);
2206         else
2207                 conn->max_xmit_dlength = max;
2208         cxgbi_align_pdu_size(conn->max_xmit_dlength);
2209
2210         return 0;
2211 }
2212
2213 static int cxgbi_conn_max_recv_dlength(struct iscsi_conn *conn)
2214 {
2215         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2216         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2217         unsigned int max = cconn->chba->cdev->rx_max_size;
2218
2219         cxgbi_align_pdu_size(max);
2220
2221         if (conn->max_recv_dlength) {
2222                 if (conn->max_recv_dlength > max) {
2223                         pr_err("MaxRecvDataSegmentLength %u > %u.\n",
2224                                 conn->max_recv_dlength, max);
2225                         return -EINVAL;
2226                 }
2227                 conn->max_recv_dlength = min(conn->max_recv_dlength, max);
2228                 cxgbi_align_pdu_size(conn->max_recv_dlength);
2229         } else
2230                 conn->max_recv_dlength = max;
2231
2232         return 0;
2233 }
2234
2235 int cxgbi_set_conn_param(struct iscsi_cls_conn *cls_conn,
2236                         enum iscsi_param param, char *buf, int buflen)
2237 {
2238         struct iscsi_conn *conn = cls_conn->dd_data;
2239         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2240         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2241         struct cxgbi_sock *csk = cconn->cep->csk;
2242         int err;
2243
2244         log_debug(1 << CXGBI_DBG_ISCSI,
2245                 "cls_conn 0x%p, param %d, buf(%d) %s.\n",
2246                 cls_conn, param, buflen, buf);
2247
2248         switch (param) {
2249         case ISCSI_PARAM_HDRDGST_EN:
2250                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2251                 if (!err && conn->hdrdgst_en)
2252                         err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2253                                                         conn->hdrdgst_en,
2254                                                         conn->datadgst_en, 0);
2255                 break;
2256         case ISCSI_PARAM_DATADGST_EN:
2257                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2258                 if (!err && conn->datadgst_en)
2259                         err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2260                                                         conn->hdrdgst_en,
2261                                                         conn->datadgst_en, 0);
2262                 break;
2263         case ISCSI_PARAM_MAX_R2T:
2264                 return iscsi_tcp_set_max_r2t(conn, buf);
2265         case ISCSI_PARAM_MAX_RECV_DLENGTH:
2266                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2267                 if (!err)
2268                         err = cxgbi_conn_max_recv_dlength(conn);
2269                 break;
2270         case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2271                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2272                 if (!err)
2273                         err = cxgbi_conn_max_xmit_dlength(conn);
2274                 break;
2275         default:
2276                 return iscsi_set_param(cls_conn, param, buf, buflen);
2277         }
2278         return err;
2279 }
2280 EXPORT_SYMBOL_GPL(cxgbi_set_conn_param);
2281
2282 static inline int csk_print_port(struct cxgbi_sock *csk, char *buf)
2283 {
2284         int len;
2285
2286         cxgbi_sock_get(csk);
2287         len = sprintf(buf, "%hu\n", ntohs(csk->daddr.sin_port));
2288         cxgbi_sock_put(csk);
2289
2290         return len;
2291 }
2292
2293 static inline int csk_print_ip(struct cxgbi_sock *csk, char *buf)
2294 {
2295         int len;
2296
2297         cxgbi_sock_get(csk);
2298         if (csk->csk_family == AF_INET)
2299                 len = sprintf(buf, "%pI4",
2300                               &csk->daddr.sin_addr.s_addr);
2301         else
2302                 len = sprintf(buf, "%pI6",
2303                               &csk->daddr6.sin6_addr);
2304
2305         cxgbi_sock_put(csk);
2306
2307         return len;
2308 }
2309
2310 int cxgbi_get_ep_param(struct iscsi_endpoint *ep, enum iscsi_param param,
2311                        char *buf)
2312 {
2313         struct cxgbi_endpoint *cep = ep->dd_data;
2314         struct cxgbi_sock *csk;
2315         int len;
2316
2317         log_debug(1 << CXGBI_DBG_ISCSI,
2318                 "cls_conn 0x%p, param %d.\n", ep, param);
2319
2320         switch (param) {
2321         case ISCSI_PARAM_CONN_PORT:
2322         case ISCSI_PARAM_CONN_ADDRESS:
2323                 if (!cep)
2324                         return -ENOTCONN;
2325
2326                 csk = cep->csk;
2327                 if (!csk)
2328                         return -ENOTCONN;
2329
2330                 return iscsi_conn_get_addr_param((struct sockaddr_storage *)
2331                                                  &csk->daddr, param, buf);
2332         default:
2333                 return -ENOSYS;
2334         }
2335         return len;
2336 }
2337 EXPORT_SYMBOL_GPL(cxgbi_get_ep_param);
2338
2339 struct iscsi_cls_conn *
2340 cxgbi_create_conn(struct iscsi_cls_session *cls_session, u32 cid)
2341 {
2342         struct iscsi_cls_conn *cls_conn;
2343         struct iscsi_conn *conn;
2344         struct iscsi_tcp_conn *tcp_conn;
2345         struct cxgbi_conn *cconn;
2346
2347         cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*cconn), cid);
2348         if (!cls_conn)
2349                 return NULL;
2350
2351         conn = cls_conn->dd_data;
2352         tcp_conn = conn->dd_data;
2353         cconn = tcp_conn->dd_data;
2354         cconn->iconn = conn;
2355
2356         log_debug(1 << CXGBI_DBG_ISCSI,
2357                 "cid %u(0x%x), cls 0x%p,0x%p, conn 0x%p,0x%p,0x%p.\n",
2358                 cid, cid, cls_session, cls_conn, conn, tcp_conn, cconn);
2359
2360         return cls_conn;
2361 }
2362 EXPORT_SYMBOL_GPL(cxgbi_create_conn);
2363
2364 int cxgbi_bind_conn(struct iscsi_cls_session *cls_session,
2365                                 struct iscsi_cls_conn *cls_conn,
2366                                 u64 transport_eph, int is_leading)
2367 {
2368         struct iscsi_conn *conn = cls_conn->dd_data;
2369         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2370         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2371         struct cxgbi_ppm *ppm;
2372         struct iscsi_endpoint *ep;
2373         struct cxgbi_endpoint *cep;
2374         struct cxgbi_sock *csk;
2375         int err;
2376
2377         ep = iscsi_lookup_endpoint(transport_eph);
2378         if (!ep)
2379                 return -EINVAL;
2380
2381         /*  setup ddp pagesize */
2382         cep = ep->dd_data;
2383         csk = cep->csk;
2384
2385         ppm = csk->cdev->cdev2ppm(csk->cdev);
2386         err = csk->cdev->csk_ddp_setup_pgidx(csk, csk->tid,
2387                                              ppm->tformat.pgsz_idx_dflt, 0);
2388         if (err < 0)
2389                 return err;
2390
2391         err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
2392         if (err)
2393                 return -EINVAL;
2394
2395         /*  calculate the tag idx bits needed for this conn based on cmds_max */
2396         cconn->task_idx_bits = (__ilog2_u32(conn->session->cmds_max - 1)) + 1;
2397
2398         write_lock_bh(&csk->callback_lock);
2399         csk->user_data = conn;
2400         cconn->chba = cep->chba;
2401         cconn->cep = cep;
2402         cep->cconn = cconn;
2403         write_unlock_bh(&csk->callback_lock);
2404
2405         cxgbi_conn_max_xmit_dlength(conn);
2406         cxgbi_conn_max_recv_dlength(conn);
2407
2408         log_debug(1 << CXGBI_DBG_ISCSI,
2409                 "cls 0x%p,0x%p, ep 0x%p, cconn 0x%p, csk 0x%p.\n",
2410                 cls_session, cls_conn, ep, cconn, csk);
2411         /*  init recv engine */
2412         iscsi_tcp_hdr_recv_prep(tcp_conn);
2413
2414         return 0;
2415 }
2416 EXPORT_SYMBOL_GPL(cxgbi_bind_conn);
2417
2418 struct iscsi_cls_session *cxgbi_create_session(struct iscsi_endpoint *ep,
2419                                                 u16 cmds_max, u16 qdepth,
2420                                                 u32 initial_cmdsn)
2421 {
2422         struct cxgbi_endpoint *cep;
2423         struct cxgbi_hba *chba;
2424         struct Scsi_Host *shost;
2425         struct iscsi_cls_session *cls_session;
2426         struct iscsi_session *session;
2427
2428         if (!ep) {
2429                 pr_err("missing endpoint.\n");
2430                 return NULL;
2431         }
2432
2433         cep = ep->dd_data;
2434         chba = cep->chba;
2435         shost = chba->shost;
2436
2437         BUG_ON(chba != iscsi_host_priv(shost));
2438
2439         cls_session = iscsi_session_setup(chba->cdev->itp, shost,
2440                                         cmds_max, 0,
2441                                         sizeof(struct iscsi_tcp_task) +
2442                                         sizeof(struct cxgbi_task_data),
2443                                         initial_cmdsn, ISCSI_MAX_TARGET);
2444         if (!cls_session)
2445                 return NULL;
2446
2447         session = cls_session->dd_data;
2448         if (iscsi_tcp_r2tpool_alloc(session))
2449                 goto remove_session;
2450
2451         log_debug(1 << CXGBI_DBG_ISCSI,
2452                 "ep 0x%p, cls sess 0x%p.\n", ep, cls_session);
2453         return cls_session;
2454
2455 remove_session:
2456         iscsi_session_teardown(cls_session);
2457         return NULL;
2458 }
2459 EXPORT_SYMBOL_GPL(cxgbi_create_session);
2460
2461 void cxgbi_destroy_session(struct iscsi_cls_session *cls_session)
2462 {
2463         log_debug(1 << CXGBI_DBG_ISCSI,
2464                 "cls sess 0x%p.\n", cls_session);
2465
2466         iscsi_tcp_r2tpool_free(cls_session->dd_data);
2467         iscsi_session_teardown(cls_session);
2468 }
2469 EXPORT_SYMBOL_GPL(cxgbi_destroy_session);
2470
2471 int cxgbi_set_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2472                         char *buf, int buflen)
2473 {
2474         struct cxgbi_hba *chba = iscsi_host_priv(shost);
2475
2476         if (!chba->ndev) {
2477                 shost_printk(KERN_ERR, shost, "Could not get host param. "
2478                                 "netdev for host not set.\n");
2479                 return -ENODEV;
2480         }
2481
2482         log_debug(1 << CXGBI_DBG_ISCSI,
2483                 "shost 0x%p, hba 0x%p,%s, param %d, buf(%d) %s.\n",
2484                 shost, chba, chba->ndev->name, param, buflen, buf);
2485
2486         switch (param) {
2487         case ISCSI_HOST_PARAM_IPADDRESS:
2488         {
2489                 __be32 addr = in_aton(buf);
2490                 log_debug(1 << CXGBI_DBG_ISCSI,
2491                         "hba %s, req. ipv4 %pI4.\n", chba->ndev->name, &addr);
2492                 cxgbi_set_iscsi_ipv4(chba, addr);
2493                 return 0;
2494         }
2495         case ISCSI_HOST_PARAM_HWADDRESS:
2496         case ISCSI_HOST_PARAM_NETDEV_NAME:
2497                 return 0;
2498         default:
2499                 return iscsi_host_set_param(shost, param, buf, buflen);
2500         }
2501 }
2502 EXPORT_SYMBOL_GPL(cxgbi_set_host_param);
2503
2504 int cxgbi_get_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2505                         char *buf)
2506 {
2507         struct cxgbi_hba *chba = iscsi_host_priv(shost);
2508         int len = 0;
2509
2510         if (!chba->ndev) {
2511                 shost_printk(KERN_ERR, shost, "Could not get host param. "
2512                                 "netdev for host not set.\n");
2513                 return -ENODEV;
2514         }
2515
2516         log_debug(1 << CXGBI_DBG_ISCSI,
2517                 "shost 0x%p, hba 0x%p,%s, param %d.\n",
2518                 shost, chba, chba->ndev->name, param);
2519
2520         switch (param) {
2521         case ISCSI_HOST_PARAM_HWADDRESS:
2522                 len = sysfs_format_mac(buf, chba->ndev->dev_addr, 6);
2523                 break;
2524         case ISCSI_HOST_PARAM_NETDEV_NAME:
2525                 len = sprintf(buf, "%s\n", chba->ndev->name);
2526                 break;
2527         case ISCSI_HOST_PARAM_IPADDRESS:
2528         {
2529                 struct cxgbi_sock *csk = find_sock_on_port(chba->cdev,
2530                                                            chba->port_id);
2531                 if (csk) {
2532                         len = sprintf(buf, "%pIS",
2533                                       (struct sockaddr *)&csk->saddr);
2534                 }
2535                 log_debug(1 << CXGBI_DBG_ISCSI,
2536                           "hba %s, addr %s.\n", chba->ndev->name, buf);
2537                 break;
2538         }
2539         default:
2540                 return iscsi_host_get_param(shost, param, buf);
2541         }
2542
2543         return len;
2544 }
2545 EXPORT_SYMBOL_GPL(cxgbi_get_host_param);
2546
2547 struct iscsi_endpoint *cxgbi_ep_connect(struct Scsi_Host *shost,
2548                                         struct sockaddr *dst_addr,
2549                                         int non_blocking)
2550 {
2551         struct iscsi_endpoint *ep;
2552         struct cxgbi_endpoint *cep;
2553         struct cxgbi_hba *hba = NULL;
2554         struct cxgbi_sock *csk;
2555         int ifindex = 0;
2556         int err = -EINVAL;
2557
2558         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2559                 "shost 0x%p, non_blocking %d, dst_addr 0x%p.\n",
2560                 shost, non_blocking, dst_addr);
2561
2562         if (shost) {
2563                 hba = iscsi_host_priv(shost);
2564                 if (!hba) {
2565                         pr_info("shost 0x%p, priv NULL.\n", shost);
2566                         goto err_out;
2567                 }
2568
2569                 rtnl_lock();
2570                 if (!vlan_uses_dev(hba->ndev))
2571                         ifindex = hba->ndev->ifindex;
2572                 rtnl_unlock();
2573         }
2574
2575         if (dst_addr->sa_family == AF_INET) {
2576                 csk = cxgbi_check_route(dst_addr, ifindex);
2577 #if IS_ENABLED(CONFIG_IPV6)
2578         } else if (dst_addr->sa_family == AF_INET6) {
2579                 csk = cxgbi_check_route6(dst_addr, ifindex);
2580 #endif
2581         } else {
2582                 pr_info("address family 0x%x NOT supported.\n",
2583                         dst_addr->sa_family);
2584                 err = -EAFNOSUPPORT;
2585                 return (struct iscsi_endpoint *)ERR_PTR(err);
2586         }
2587
2588         if (IS_ERR(csk))
2589                 return (struct iscsi_endpoint *)csk;
2590         cxgbi_sock_get(csk);
2591
2592         if (!hba)
2593                 hba = csk->cdev->hbas[csk->port_id];
2594         else if (hba != csk->cdev->hbas[csk->port_id]) {
2595                 pr_info("Could not connect through requested host %u"
2596                         "hba 0x%p != 0x%p (%u).\n",
2597                         shost->host_no, hba,
2598                         csk->cdev->hbas[csk->port_id], csk->port_id);
2599                 err = -ENOSPC;
2600                 goto release_conn;
2601         }
2602
2603         err = sock_get_port(csk);
2604         if (err)
2605                 goto release_conn;
2606
2607         cxgbi_sock_set_state(csk, CTP_CONNECTING);
2608         err = csk->cdev->csk_init_act_open(csk);
2609         if (err)
2610                 goto release_conn;
2611
2612         if (cxgbi_sock_is_closing(csk)) {
2613                 err = -ENOSPC;
2614                 pr_info("csk 0x%p is closing.\n", csk);
2615                 goto release_conn;
2616         }
2617
2618         ep = iscsi_create_endpoint(sizeof(*cep));
2619         if (!ep) {
2620                 err = -ENOMEM;
2621                 pr_info("iscsi alloc ep, OOM.\n");
2622                 goto release_conn;
2623         }
2624
2625         cep = ep->dd_data;
2626         cep->csk = csk;
2627         cep->chba = hba;
2628
2629         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2630                 "ep 0x%p, cep 0x%p, csk 0x%p, hba 0x%p,%s.\n",
2631                 ep, cep, csk, hba, hba->ndev->name);
2632         return ep;
2633
2634 release_conn:
2635         cxgbi_sock_put(csk);
2636         cxgbi_sock_closed(csk);
2637 err_out:
2638         return ERR_PTR(err);
2639 }
2640 EXPORT_SYMBOL_GPL(cxgbi_ep_connect);
2641
2642 int cxgbi_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
2643 {
2644         struct cxgbi_endpoint *cep = ep->dd_data;
2645         struct cxgbi_sock *csk = cep->csk;
2646
2647         if (!cxgbi_sock_is_established(csk))
2648                 return 0;
2649         return 1;
2650 }
2651 EXPORT_SYMBOL_GPL(cxgbi_ep_poll);
2652
2653 void cxgbi_ep_disconnect(struct iscsi_endpoint *ep)
2654 {
2655         struct cxgbi_endpoint *cep = ep->dd_data;
2656         struct cxgbi_conn *cconn = cep->cconn;
2657         struct cxgbi_sock *csk = cep->csk;
2658
2659         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2660                 "ep 0x%p, cep 0x%p, cconn 0x%p, csk 0x%p,%u,0x%lx.\n",
2661                 ep, cep, cconn, csk, csk->state, csk->flags);
2662
2663         if (cconn && cconn->iconn) {
2664                 iscsi_suspend_tx(cconn->iconn);
2665                 write_lock_bh(&csk->callback_lock);
2666                 cep->csk->user_data = NULL;
2667                 cconn->cep = NULL;
2668                 write_unlock_bh(&csk->callback_lock);
2669         }
2670         iscsi_destroy_endpoint(ep);
2671
2672         if (likely(csk->state >= CTP_ESTABLISHED))
2673                 need_active_close(csk);
2674         else
2675                 cxgbi_sock_closed(csk);
2676
2677         cxgbi_sock_put(csk);
2678 }
2679 EXPORT_SYMBOL_GPL(cxgbi_ep_disconnect);
2680
2681 int cxgbi_iscsi_init(struct iscsi_transport *itp,
2682                         struct scsi_transport_template **stt)
2683 {
2684         *stt = iscsi_register_transport(itp);
2685         if (*stt == NULL) {
2686                 pr_err("unable to register %s transport 0x%p.\n",
2687                         itp->name, itp);
2688                 return -ENODEV;
2689         }
2690         log_debug(1 << CXGBI_DBG_ISCSI,
2691                 "%s, registered iscsi transport 0x%p.\n",
2692                 itp->name, stt);
2693         return 0;
2694 }
2695 EXPORT_SYMBOL_GPL(cxgbi_iscsi_init);
2696
2697 void cxgbi_iscsi_cleanup(struct iscsi_transport *itp,
2698                         struct scsi_transport_template **stt)
2699 {
2700         if (*stt) {
2701                 log_debug(1 << CXGBI_DBG_ISCSI,
2702                         "de-register transport 0x%p, %s, stt 0x%p.\n",
2703                         itp, itp->name, *stt);
2704                 *stt = NULL;
2705                 iscsi_unregister_transport(itp);
2706         }
2707 }
2708 EXPORT_SYMBOL_GPL(cxgbi_iscsi_cleanup);
2709
2710 umode_t cxgbi_attr_is_visible(int param_type, int param)
2711 {
2712         switch (param_type) {
2713         case ISCSI_HOST_PARAM:
2714                 switch (param) {
2715                 case ISCSI_HOST_PARAM_NETDEV_NAME:
2716                 case ISCSI_HOST_PARAM_HWADDRESS:
2717                 case ISCSI_HOST_PARAM_IPADDRESS:
2718                 case ISCSI_HOST_PARAM_INITIATOR_NAME:
2719                         return S_IRUGO;
2720                 default:
2721                         return 0;
2722                 }
2723         case ISCSI_PARAM:
2724                 switch (param) {
2725                 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2726                 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2727                 case ISCSI_PARAM_HDRDGST_EN:
2728                 case ISCSI_PARAM_DATADGST_EN:
2729                 case ISCSI_PARAM_CONN_ADDRESS:
2730                 case ISCSI_PARAM_CONN_PORT:
2731                 case ISCSI_PARAM_EXP_STATSN:
2732                 case ISCSI_PARAM_PERSISTENT_ADDRESS:
2733                 case ISCSI_PARAM_PERSISTENT_PORT:
2734                 case ISCSI_PARAM_PING_TMO:
2735                 case ISCSI_PARAM_RECV_TMO:
2736                 case ISCSI_PARAM_INITIAL_R2T_EN:
2737                 case ISCSI_PARAM_MAX_R2T:
2738                 case ISCSI_PARAM_IMM_DATA_EN:
2739                 case ISCSI_PARAM_FIRST_BURST:
2740                 case ISCSI_PARAM_MAX_BURST:
2741                 case ISCSI_PARAM_PDU_INORDER_EN:
2742                 case ISCSI_PARAM_DATASEQ_INORDER_EN:
2743                 case ISCSI_PARAM_ERL:
2744                 case ISCSI_PARAM_TARGET_NAME:
2745                 case ISCSI_PARAM_TPGT:
2746                 case ISCSI_PARAM_USERNAME:
2747                 case ISCSI_PARAM_PASSWORD:
2748                 case ISCSI_PARAM_USERNAME_IN:
2749                 case ISCSI_PARAM_PASSWORD_IN:
2750                 case ISCSI_PARAM_FAST_ABORT:
2751                 case ISCSI_PARAM_ABORT_TMO:
2752                 case ISCSI_PARAM_LU_RESET_TMO:
2753                 case ISCSI_PARAM_TGT_RESET_TMO:
2754                 case ISCSI_PARAM_IFACE_NAME:
2755                 case ISCSI_PARAM_INITIATOR_NAME:
2756                         return S_IRUGO;
2757                 default:
2758                         return 0;
2759                 }
2760         }
2761
2762         return 0;
2763 }
2764 EXPORT_SYMBOL_GPL(cxgbi_attr_is_visible);
2765
2766 static int __init libcxgbi_init_module(void)
2767 {
2768         pr_info("%s", version);
2769
2770         BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, cb) <
2771                      sizeof(struct cxgbi_skb_cb));
2772         return 0;
2773 }
2774
2775 static void __exit libcxgbi_exit_module(void)
2776 {
2777         cxgbi_device_unregister_all(0xFF);
2778         return;
2779 }
2780
2781 module_init(libcxgbi_init_module);
2782 module_exit(libcxgbi_exit_module);