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 = kvzalloc(array_size(max_conn,
  81                                              sizeof(struct cxgbi_sock *)),
  82                                   GFP_KERNEL | __GFP_NOWARN);
  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         if (cdev->cdev2ppm)
 125                 cxgbi_ppm_release(cdev->cdev2ppm(cdev));
 126         if (cdev->pmap.max_connect)
 127                 kvfree(cdev->pmap.port_csk);
 128         kfree(cdev);
 129 }
 130
 131 struct cxgbi_device *cxgbi_device_register(unsigned int extra,
 132                                            unsigned int nports)
 133 {
 134         struct cxgbi_device *cdev;
 135
 136         cdev = kzalloc(sizeof(*cdev) + extra + nports *
 137                         (sizeof(struct cxgbi_hba *) +
 138                          sizeof(struct net_device *)),
 139                         GFP_KERNEL);
 140         if (!cdev) {
 141                 pr_warn("nport %d, OOM.\n", nports);
 142                 return NULL;
 143         }
 144         cdev->ports = (struct net_device **)(cdev + 1);
 145         cdev->hbas = (struct cxgbi_hba **)(((char*)cdev->ports) + nports *
 146                                                 sizeof(struct net_device *));
 147         if (extra)
 148                 cdev->dd_data = ((char *)cdev->hbas) +
 149                                 nports * sizeof(struct cxgbi_hba *);
 150         spin_lock_init(&cdev->pmap.lock);
 151
 152         mutex_lock(&cdev_mutex);
 153         list_add_tail(&cdev->list_head, &cdev_list);
 154         mutex_unlock(&cdev_mutex);
 155
 156         spin_lock(&cdev_rcu_lock);
 157         list_add_tail_rcu(&cdev->rcu_node, &cdev_rcu_list);
 158         spin_unlock(&cdev_rcu_lock);
 159
 160         log_debug(1 << CXGBI_DBG_DEV,
 161                 "cdev 0x%p, p# %u.\n", cdev, nports);
 162         return cdev;
 163 }
 164 EXPORT_SYMBOL_GPL(cxgbi_device_register);
 165
 166 void cxgbi_device_unregister(struct cxgbi_device *cdev)
 167 {
 168         log_debug(1 << CXGBI_DBG_DEV,
 169                 "cdev 0x%p, p# %u,%s.\n",
 170                 cdev, cdev->nports, cdev->nports ? cdev->ports[0]->name : "");
 171
 172         mutex_lock(&cdev_mutex);
 173         list_del(&cdev->list_head);
 174         mutex_unlock(&cdev_mutex);
 175
 176         spin_lock(&cdev_rcu_lock);
 177         list_del_rcu(&cdev->rcu_node);
 178         spin_unlock(&cdev_rcu_lock);
 179         synchronize_rcu();
 180
 181         cxgbi_device_destroy(cdev);
 182 }
 183 EXPORT_SYMBOL_GPL(cxgbi_device_unregister);
 184
 185 void cxgbi_device_unregister_all(unsigned int flag)
 186 {
 187         struct cxgbi_device *cdev, *tmp;
 188
 189         mutex_lock(&cdev_mutex);
 190         list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
 191                 if ((cdev->flags & flag) == flag) {
 192                         mutex_unlock(&cdev_mutex);
 193                         cxgbi_device_unregister(cdev);
 194                         mutex_lock(&cdev_mutex);
 195                 }
 196         }
 197         mutex_unlock(&cdev_mutex);
 198 }
 199 EXPORT_SYMBOL_GPL(cxgbi_device_unregister_all);
 200
 201 struct cxgbi_device *cxgbi_device_find_by_lldev(void *lldev)
 202 {
 203         struct cxgbi_device *cdev, *tmp;
 204
 205         mutex_lock(&cdev_mutex);
 206         list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
 207                 if (cdev->lldev == lldev) {
 208                         mutex_unlock(&cdev_mutex);
 209                         return cdev;
 210                 }
 211         }
 212         mutex_unlock(&cdev_mutex);
 213
 214         log_debug(1 << CXGBI_DBG_DEV,
 215                 "lldev 0x%p, NO match found.\n", lldev);
 216         return NULL;
 217 }
 218 EXPORT_SYMBOL_GPL(cxgbi_device_find_by_lldev);
 219
 220 struct cxgbi_device *cxgbi_device_find_by_netdev(struct net_device *ndev,
 221                                                  int *port)
 222 {
 223         struct net_device *vdev = NULL;
 224         struct cxgbi_device *cdev, *tmp;
 225         int i;
 226
 227         if (is_vlan_dev(ndev)) {
 228                 vdev = ndev;
 229                 ndev = vlan_dev_real_dev(ndev);
 230                 log_debug(1 << CXGBI_DBG_DEV,
 231                         "vlan dev %s -> %s.\n", vdev->name, ndev->name);
 232         }
 233
 234         mutex_lock(&cdev_mutex);
 235         list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
 236                 for (i = 0; i < cdev->nports; i++) {
 237                         if (ndev == cdev->ports[i]) {
 238                                 cdev->hbas[i]->vdev = vdev;
 239                                 mutex_unlock(&cdev_mutex);
 240                                 if (port)
 241                                         *port = i;
 242                                 return cdev;
 243                         }
 244                 }
 245         }
 246         mutex_unlock(&cdev_mutex);
 247         log_debug(1 << CXGBI_DBG_DEV,
 248                 "ndev 0x%p, %s, NO match found.\n", ndev, ndev->name);
 249         return NULL;
 250 }
 251 EXPORT_SYMBOL_GPL(cxgbi_device_find_by_netdev);
 252
 253 struct cxgbi_device *cxgbi_device_find_by_netdev_rcu(struct net_device *ndev,
 254                                                      int *port)
 255 {
 256         struct net_device *vdev = NULL;
 257         struct cxgbi_device *cdev;
 258         int i;
 259
 260         if (is_vlan_dev(ndev)) {
 261                 vdev = ndev;
 262                 ndev = vlan_dev_real_dev(ndev);
 263                 pr_info("vlan dev %s -> %s.\n", vdev->name, ndev->name);
 264         }
 265
 266         rcu_read_lock();
 267         list_for_each_entry_rcu(cdev, &cdev_rcu_list, rcu_node) {
 268                 for (i = 0; i < cdev->nports; i++) {
 269                         if (ndev == cdev->ports[i]) {
 270                                 cdev->hbas[i]->vdev = vdev;
 271                                 rcu_read_unlock();
 272                                 if (port)
 273                                         *port = i;
 274                                 return cdev;
 275                         }
 276                 }
 277         }
 278         rcu_read_unlock();
 279
 280         log_debug(1 << CXGBI_DBG_DEV,
 281                   "ndev 0x%p, %s, NO match found.\n", ndev, ndev->name);
 282         return NULL;
 283 }
 284 EXPORT_SYMBOL_GPL(cxgbi_device_find_by_netdev_rcu);
 285
 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
 319 void cxgbi_hbas_remove(struct cxgbi_device *cdev)
 320 {
 321         int i;
 322         struct cxgbi_hba *chba;
 323
 324         log_debug(1 << CXGBI_DBG_DEV,
 325                 "cdev 0x%p, p#%u.\n", cdev, cdev->nports);
 326
 327         for (i = 0; i < cdev->nports; i++) {
 328                 chba = cdev->hbas[i];
 329                 if (chba) {
 330                         cdev->hbas[i] = NULL;
 331                         iscsi_host_remove(chba->shost);
 332                         pci_dev_put(cdev->pdev);
 333                         iscsi_host_free(chba->shost);
 334                 }
 335         }
 336 }
 337 EXPORT_SYMBOL_GPL(cxgbi_hbas_remove);
 338
 339 int cxgbi_hbas_add(struct cxgbi_device *cdev, u64 max_lun,
 340                 unsigned int max_conns, struct scsi_host_template *sht,
 341                 struct scsi_transport_template *stt)
 342 {
 343         struct cxgbi_hba *chba;
 344         struct Scsi_Host *shost;
 345         int i, err;
 346
 347         log_debug(1 << CXGBI_DBG_DEV, "cdev 0x%p, p#%u.\n", cdev, cdev->nports);
 348
 349         for (i = 0; i < cdev->nports; i++) {
 350                 shost = iscsi_host_alloc(sht, sizeof(*chba), 1);
 351                 if (!shost) {
 352                         pr_info("0x%p, p%d, %s, host alloc failed.\n",
 353                                 cdev, i, cdev->ports[i]->name);
 354                         err = -ENOMEM;
 355                         goto err_out;
 356                 }
 357
 358                 shost->transportt = stt;
 359                 shost->max_lun = max_lun;
 360                 shost->max_id = max_conns - 1;
 361                 shost->max_channel = 0;
 362                 shost->max_cmd_len = SCSI_MAX_VARLEN_CDB_SIZE;
 363
 364                 chba = iscsi_host_priv(shost);
 365                 chba->cdev = cdev;
 366                 chba->ndev = cdev->ports[i];
 367                 chba->shost = shost;
 368
 369                 shost->can_queue = sht->can_queue - ISCSI_MGMT_CMDS_MAX;
 370
 371                 log_debug(1 << CXGBI_DBG_DEV,
 372                         "cdev 0x%p, p#%d %s: chba 0x%p.\n",
 373                         cdev, i, cdev->ports[i]->name, chba);
 374
 375                 pci_dev_get(cdev->pdev);
 376                 err = iscsi_host_add(shost, &cdev->pdev->dev);
 377                 if (err) {
 378                         pr_info("cdev 0x%p, p#%d %s, host add failed.\n",
 379                                 cdev, i, cdev->ports[i]->name);
 380                         pci_dev_put(cdev->pdev);
 381                         scsi_host_put(shost);
 382                         goto  err_out;
 383                 }
 384
 385                 cdev->hbas[i] = chba;
 386         }
 387
 388         return 0;
 389
 390 err_out:
 391         cxgbi_hbas_remove(cdev);
 392         return err;
 393 }
 394 EXPORT_SYMBOL_GPL(cxgbi_hbas_add);
 395
 396 /*
 397  * iSCSI offload
 398  *
 399  * - source port management
 400  *   To find a free source port in the port allocation map we use a very simple
 401  *   rotor scheme to look for the next free port.
 402  *
 403  *   If a source port has been specified make sure that it doesn't collide with
 404  *   our normal source port allocation map.  If it's outside the range of our
 405  *   allocation/deallocation scheme just let them use it.
 406  *
 407  *   If the source port is outside our allocation range, the caller is
 408  *   responsible for keeping track of their port usage.
 409  */
 410
 411 static struct cxgbi_sock *find_sock_on_port(struct cxgbi_device *cdev,
 412                                             unsigned char port_id)
 413 {
 414         struct cxgbi_ports_map *pmap = &cdev->pmap;
 415         unsigned int i;
 416         unsigned int used;
 417
 418         if (!pmap->max_connect || !pmap->used)
 419                 return NULL;
 420
 421         spin_lock_bh(&pmap->lock);
 422         used = pmap->used;
 423         for (i = 0; used && i < pmap->max_connect; i++) {
 424                 struct cxgbi_sock *csk = pmap->port_csk[i];
 425
 426                 if (csk) {
 427                         if (csk->port_id == port_id) {
 428                                 spin_unlock_bh(&pmap->lock);
 429                                 return csk;
 430                         }
 431                         used--;
 432                 }
 433         }
 434         spin_unlock_bh(&pmap->lock);
 435
 436         return NULL;
 437 }
 438
 439 static int sock_get_port(struct cxgbi_sock *csk)
 440 {
 441         struct cxgbi_device *cdev = csk->cdev;
 442         struct cxgbi_ports_map *pmap = &cdev->pmap;
 443         unsigned int start;
 444         int idx;
 445         __be16 *port;
 446
 447         if (!pmap->max_connect) {
 448                 pr_err("cdev 0x%p, p#%u %s, NO port map.\n",
 449                            cdev, csk->port_id, cdev->ports[csk->port_id]->name);
 450                 return -EADDRNOTAVAIL;
 451         }
 452
 453         if (csk->csk_family == AF_INET)
 454                 port = &csk->saddr.sin_port;
 455         else /* ipv6 */
 456                 port = &csk->saddr6.sin6_port;
 457
 458         if (*port) {
 459                 pr_err("source port NON-ZERO %u.\n",
 460                         ntohs(*port));
 461                 return -EADDRINUSE;
 462         }
 463
 464         spin_lock_bh(&pmap->lock);
 465         if (pmap->used >= pmap->max_connect) {
 466                 spin_unlock_bh(&pmap->lock);
 467                 pr_info("cdev 0x%p, p#%u %s, ALL ports used.\n",
 468                         cdev, csk->port_id, cdev->ports[csk->port_id]->name);
 469                 return -EADDRNOTAVAIL;
 470         }
 471
 472         start = idx = pmap->next;
 473         do {
 474                 if (++idx >= pmap->max_connect)
 475                         idx = 0;
 476                 if (!pmap->port_csk[idx]) {
 477                         pmap->used++;
 478                         *port = htons(pmap->sport_base + idx);
 479                         pmap->next = idx;
 480                         pmap->port_csk[idx] = csk;
 481                         spin_unlock_bh(&pmap->lock);
 482                         cxgbi_sock_get(csk);
 483                         log_debug(1 << CXGBI_DBG_SOCK,
 484                                 "cdev 0x%p, p#%u %s, p %u, %u.\n",
 485                                 cdev, csk->port_id,
 486                                 cdev->ports[csk->port_id]->name,
 487                                 pmap->sport_base + idx, pmap->next);
 488                         return 0;
 489                 }
 490         } while (idx != start);
 491         spin_unlock_bh(&pmap->lock);
 492
 493         /* should not happen */
 494         pr_warn("cdev 0x%p, p#%u %s, next %u?\n",
 495                 cdev, csk->port_id, cdev->ports[csk->port_id]->name,
 496                 pmap->next);
 497         return -EADDRNOTAVAIL;
 498 }
 499
 500 static void sock_put_port(struct cxgbi_sock *csk)
 501 {
 502         struct cxgbi_device *cdev = csk->cdev;
 503         struct cxgbi_ports_map *pmap = &cdev->pmap;
 504         __be16 *port;
 505
 506         if (csk->csk_family == AF_INET)
 507                 port = &csk->saddr.sin_port;
 508         else /* ipv6 */
 509                 port = &csk->saddr6.sin6_port;
 510
 511         if (*port) {
 512                 int idx = ntohs(*port) - pmap->sport_base;
 513
 514                 *port = 0;
 515                 if (idx < 0 || idx >= pmap->max_connect) {
 516                         pr_err("cdev 0x%p, p#%u %s, port %u OOR.\n",
 517                                 cdev, csk->port_id,
 518                                 cdev->ports[csk->port_id]->name,
 519                                 ntohs(*port));
 520                         return;
 521                 }
 522
 523                 spin_lock_bh(&pmap->lock);
 524                 pmap->port_csk[idx] = NULL;
 525                 pmap->used--;
 526                 spin_unlock_bh(&pmap->lock);
 527
 528                 log_debug(1 << CXGBI_DBG_SOCK,
 529                         "cdev 0x%p, p#%u %s, release %u.\n",
 530                         cdev, csk->port_id, cdev->ports[csk->port_id]->name,
 531                         pmap->sport_base + idx);
 532
 533                 cxgbi_sock_put(csk);
 534         }
 535 }
 536
 537 /*
 538  * iscsi tcp connection
 539  */
 540 void cxgbi_sock_free_cpl_skbs(struct cxgbi_sock *csk)
 541 {
 542         if (csk->cpl_close) {
 543                 kfree_skb(csk->cpl_close);
 544                 csk->cpl_close = NULL;
 545         }
 546         if (csk->cpl_abort_req) {
 547                 kfree_skb(csk->cpl_abort_req);
 548                 csk->cpl_abort_req = NULL;
 549         }
 550         if (csk->cpl_abort_rpl) {
 551                 kfree_skb(csk->cpl_abort_rpl);
 552                 csk->cpl_abort_rpl = NULL;
 553         }
 554 }
 555 EXPORT_SYMBOL_GPL(cxgbi_sock_free_cpl_skbs);
 556
 557 static struct cxgbi_sock *cxgbi_sock_create(struct cxgbi_device *cdev)
 558 {
 559         struct cxgbi_sock *csk = kzalloc(sizeof(*csk), GFP_NOIO);
 560
 561         if (!csk) {
 562                 pr_info("alloc csk %zu failed.\n", sizeof(*csk));
 563                 return NULL;
 564         }
 565
 566         if (cdev->csk_alloc_cpls(csk) < 0) {
 567                 pr_info("csk 0x%p, alloc cpls failed.\n", csk);
 568                 kfree(csk);
 569                 return NULL;
 570         }
 571
 572         spin_lock_init(&csk->lock);
 573         kref_init(&csk->refcnt);
 574         skb_queue_head_init(&csk->receive_queue);
 575         skb_queue_head_init(&csk->write_queue);
 576         timer_setup(&csk->retry_timer, NULL, 0);
 577         init_completion(&csk->cmpl);
 578         rwlock_init(&csk->callback_lock);
 579         csk->cdev = cdev;
 580         csk->flags = 0;
 581         cxgbi_sock_set_state(csk, CTP_CLOSED);
 582
 583         log_debug(1 << CXGBI_DBG_SOCK, "cdev 0x%p, new csk 0x%p.\n", cdev, csk);
 584
 585         return csk;
 586 }
 587
 588 static struct rtable *find_route_ipv4(struct flowi4 *fl4,
 589                                       __be32 saddr, __be32 daddr,
 590                                       __be16 sport, __be16 dport, u8 tos,
 591                                       int ifindex)
 592 {
 593         struct rtable *rt;
 594
 595         rt = ip_route_output_ports(&init_net, fl4, NULL, daddr, saddr,
 596                                    dport, sport, IPPROTO_TCP, tos, ifindex);
 597         if (IS_ERR(rt))
 598                 return NULL;
 599
 600         return rt;
 601 }
 602
 603 static struct cxgbi_sock *
 604 cxgbi_check_route(struct sockaddr *dst_addr, int ifindex)
 605 {
 606         struct sockaddr_in *daddr = (struct sockaddr_in *)dst_addr;
 607         struct dst_entry *dst;
 608         struct net_device *ndev;
 609         struct cxgbi_device *cdev;
 610         struct rtable *rt = NULL;
 611         struct neighbour *n;
 612         struct flowi4 fl4;
 613         struct cxgbi_sock *csk = NULL;
 614         unsigned int mtu = 0;
 615         int port = 0xFFFF;
 616         int err = 0;
 617
 618         rt = find_route_ipv4(&fl4, 0, daddr->sin_addr.s_addr, 0,
 619                              daddr->sin_port, 0, ifindex);
 620         if (!rt) {
 621                 pr_info("no route to ipv4 0x%x, port %u.\n",
 622                         be32_to_cpu(daddr->sin_addr.s_addr),
 623                         be16_to_cpu(daddr->sin_port));
 624                 err = -ENETUNREACH;
 625                 goto err_out;
 626         }
 627         dst = &rt->dst;
 628         n = dst_neigh_lookup(dst, &daddr->sin_addr.s_addr);
 629         if (!n) {
 630                 err = -ENODEV;
 631                 goto rel_rt;
 632         }
 633         ndev = n->dev;
 634
 635         if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) {
 636                 pr_info("multi-cast route %pI4, port %u, dev %s.\n",
 637                         &daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
 638                         ndev->name);
 639                 err = -ENETUNREACH;
 640                 goto rel_neigh;
 641         }
 642
 643         if (ndev->flags & IFF_LOOPBACK) {
 644                 ndev = ip_dev_find(&init_net, daddr->sin_addr.s_addr);
 645                 if (!ndev) {
 646                         err = -ENETUNREACH;
 647                         goto rel_neigh;
 648                 }
 649                 mtu = ndev->mtu;
 650                 pr_info("rt dev %s, loopback -> %s, mtu %u.\n",
 651                         n->dev->name, ndev->name, mtu);
 652         }
 653
 654         if (!(ndev->flags & IFF_UP) || !netif_carrier_ok(ndev)) {
 655                 pr_info("%s interface not up.\n", ndev->name);
 656                 err = -ENETDOWN;
 657                 goto rel_neigh;
 658         }
 659
 660         cdev = cxgbi_device_find_by_netdev(ndev, &port);
 661         if (!cdev)
 662                 cdev = cxgbi_device_find_by_mac(ndev, &port);
 663         if (!cdev) {
 664                 pr_info("dst %pI4, %s, NOT cxgbi device.\n",
 665                         &daddr->sin_addr.s_addr, ndev->name);
 666                 err = -ENETUNREACH;
 667                 goto rel_neigh;
 668         }
 669         log_debug(1 << CXGBI_DBG_SOCK,
 670                 "route to %pI4 :%u, ndev p#%d,%s, cdev 0x%p.\n",
 671                 &daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
 672                            port, ndev->name, cdev);
 673
 674         csk = cxgbi_sock_create(cdev);
 675         if (!csk) {
 676                 err = -ENOMEM;
 677                 goto rel_neigh;
 678         }
 679         csk->cdev = cdev;
 680         csk->port_id = port;
 681         csk->mtu = mtu;
 682         csk->dst = dst;
 683
 684         csk->csk_family = AF_INET;
 685         csk->daddr.sin_addr.s_addr = daddr->sin_addr.s_addr;
 686         csk->daddr.sin_port = daddr->sin_port;
 687         csk->daddr.sin_family = daddr->sin_family;
 688         csk->saddr.sin_family = daddr->sin_family;
 689         csk->saddr.sin_addr.s_addr = fl4.saddr;
 690         neigh_release(n);
 691
 692         return csk;
 693
 694 rel_neigh:
 695         neigh_release(n);
 696
 697 rel_rt:
 698         ip_rt_put(rt);
 699 err_out:
 700         return ERR_PTR(err);
 701 }
 702
 703 #if IS_ENABLED(CONFIG_IPV6)
 704 static struct rt6_info *find_route_ipv6(const struct in6_addr *saddr,
 705                                         const struct in6_addr *daddr,
 706                                         int ifindex)
 707 {
 708         struct flowi6 fl;
 709
 710         memset(&fl, 0, sizeof(fl));
 711         fl.flowi6_oif = ifindex;
 712         if (saddr)
 713                 memcpy(&fl.saddr, saddr, sizeof(struct in6_addr));
 714         if (daddr)
 715                 memcpy(&fl.daddr, daddr, sizeof(struct in6_addr));
 716         return (struct rt6_info *)ip6_route_output(&init_net, NULL, &fl);
 717 }
 718
 719 static struct cxgbi_sock *
 720 cxgbi_check_route6(struct sockaddr *dst_addr, int ifindex)
 721 {
 722         struct sockaddr_in6 *daddr6 = (struct sockaddr_in6 *)dst_addr;
 723         struct dst_entry *dst;
 724         struct net_device *ndev;
 725         struct cxgbi_device *cdev;
 726         struct rt6_info *rt = NULL;
 727         struct neighbour *n;
 728         struct in6_addr pref_saddr;
 729         struct cxgbi_sock *csk = NULL;
 730         unsigned int mtu = 0;
 731         int port = 0xFFFF;
 732         int err = 0;
 733
 734         rt = find_route_ipv6(NULL, &daddr6->sin6_addr, ifindex);
 735
 736         if (!rt) {
 737                 pr_info("no route to ipv6 %pI6 port %u\n",
 738                         daddr6->sin6_addr.s6_addr,
 739                         be16_to_cpu(daddr6->sin6_port));
 740                 err = -ENETUNREACH;
 741                 goto err_out;
 742         }
 743
 744         dst = &rt->dst;
 745
 746         n = dst_neigh_lookup(dst, &daddr6->sin6_addr);
 747
 748         if (!n) {
 749                 pr_info("%pI6, port %u, dst no neighbour.\n",
 750                         daddr6->sin6_addr.s6_addr,
 751                         be16_to_cpu(daddr6->sin6_port));
 752                 err = -ENETUNREACH;
 753                 goto rel_rt;
 754         }
 755         ndev = n->dev;
 756
 757         if (!(ndev->flags & IFF_UP) || !netif_carrier_ok(ndev)) {
 758                 pr_info("%s interface not up.\n", ndev->name);
 759                 err = -ENETDOWN;
 760                 goto rel_rt;
 761         }
 762
 763         if (ipv6_addr_is_multicast(&daddr6->sin6_addr)) {
 764                 pr_info("multi-cast route %pI6 port %u, dev %s.\n",
 765                         daddr6->sin6_addr.s6_addr,
 766                         ntohs(daddr6->sin6_port), ndev->name);
 767                 err = -ENETUNREACH;
 768                 goto rel_rt;
 769         }
 770
 771         cdev = cxgbi_device_find_by_netdev(ndev, &port);
 772         if (!cdev)
 773                 cdev = cxgbi_device_find_by_mac(ndev, &port);
 774         if (!cdev) {
 775                 pr_info("dst %pI6 %s, NOT cxgbi device.\n",
 776                         daddr6->sin6_addr.s6_addr, ndev->name);
 777                 err = -ENETUNREACH;
 778                 goto rel_rt;
 779         }
 780         log_debug(1 << CXGBI_DBG_SOCK,
 781                   "route to %pI6 :%u, ndev p#%d,%s, cdev 0x%p.\n",
 782                   daddr6->sin6_addr.s6_addr, ntohs(daddr6->sin6_port), port,
 783                   ndev->name, cdev);
 784
 785         csk = cxgbi_sock_create(cdev);
 786         if (!csk) {
 787                 err = -ENOMEM;
 788                 goto rel_rt;
 789         }
 790         csk->cdev = cdev;
 791         csk->port_id = port;
 792         csk->mtu = mtu;
 793         csk->dst = dst;
 794
 795         rt6_get_prefsrc(rt, &pref_saddr);
 796         if (ipv6_addr_any(&pref_saddr)) {
 797                 struct inet6_dev *idev = ip6_dst_idev((struct dst_entry *)rt);
 798
 799                 err = ipv6_dev_get_saddr(&init_net, idev ? idev->dev : NULL,
 800                                          &daddr6->sin6_addr, 0, &pref_saddr);
 801                 if (err) {
 802                         pr_info("failed to get source address to reach %pI6\n",
 803                                 &daddr6->sin6_addr);
 804                         goto rel_rt;
 805                 }
 806         }
 807
 808         csk->csk_family = AF_INET6;
 809         csk->daddr6.sin6_addr = daddr6->sin6_addr;
 810         csk->daddr6.sin6_port = daddr6->sin6_port;
 811         csk->daddr6.sin6_family = daddr6->sin6_family;
 812         csk->saddr6.sin6_family = daddr6->sin6_family;
 813         csk->saddr6.sin6_addr = pref_saddr;
 814
 815         neigh_release(n);
 816         return csk;
 817
 818 rel_rt:
 819         if (n)
 820                 neigh_release(n);
 821
 822         ip6_rt_put(rt);
 823         if (csk)
 824                 cxgbi_sock_closed(csk);
 825 err_out:
 826         return ERR_PTR(err);
 827 }
 828 #endif /* IS_ENABLED(CONFIG_IPV6) */
 829
 830 void cxgbi_sock_established(struct cxgbi_sock *csk, unsigned int snd_isn,
 831                         unsigned int opt)
 832 {
 833         csk->write_seq = csk->snd_nxt = csk->snd_una = snd_isn;
 834         dst_confirm(csk->dst);
 835         smp_mb();
 836         cxgbi_sock_set_state(csk, CTP_ESTABLISHED);
 837 }
 838 EXPORT_SYMBOL_GPL(cxgbi_sock_established);
 839
 840 static void cxgbi_inform_iscsi_conn_closing(struct cxgbi_sock *csk)
 841 {
 842         log_debug(1 << CXGBI_DBG_SOCK,
 843                 "csk 0x%p, state %u, flags 0x%lx, conn 0x%p.\n",
 844                 csk, csk->state, csk->flags, csk->user_data);
 845
 846         if (csk->state != CTP_ESTABLISHED) {
 847                 read_lock_bh(&csk->callback_lock);
 848                 if (csk->user_data)
 849                         iscsi_conn_failure(csk->user_data,
 850                                         ISCSI_ERR_TCP_CONN_CLOSE);
 851                 read_unlock_bh(&csk->callback_lock);
 852         }
 853 }
 854
 855 void cxgbi_sock_closed(struct cxgbi_sock *csk)
 856 {
 857         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 858                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 859         cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
 860         if (csk->state == CTP_ACTIVE_OPEN || csk->state == CTP_CLOSED)
 861                 return;
 862         if (csk->saddr.sin_port)
 863                 sock_put_port(csk);
 864         if (csk->dst)
 865                 dst_release(csk->dst);
 866         csk->cdev->csk_release_offload_resources(csk);
 867         cxgbi_sock_set_state(csk, CTP_CLOSED);
 868         cxgbi_inform_iscsi_conn_closing(csk);
 869         cxgbi_sock_put(csk);
 870 }
 871 EXPORT_SYMBOL_GPL(cxgbi_sock_closed);
 872
 873 static void need_active_close(struct cxgbi_sock *csk)
 874 {
 875         int data_lost;
 876         int close_req = 0;
 877
 878         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 879                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 880         spin_lock_bh(&csk->lock);
 881         if (csk->dst)
 882                 dst_confirm(csk->dst);
 883         data_lost = skb_queue_len(&csk->receive_queue);
 884         __skb_queue_purge(&csk->receive_queue);
 885
 886         if (csk->state == CTP_ACTIVE_OPEN)
 887                 cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
 888         else if (csk->state == CTP_ESTABLISHED) {
 889                 close_req = 1;
 890                 cxgbi_sock_set_state(csk, CTP_ACTIVE_CLOSE);
 891         } else if (csk->state == CTP_PASSIVE_CLOSE) {
 892                 close_req = 1;
 893                 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
 894         }
 895
 896         if (close_req) {
 897                 if (!cxgbi_sock_flag(csk, CTPF_LOGOUT_RSP_RCVD) ||
 898                     data_lost)
 899                         csk->cdev->csk_send_abort_req(csk);
 900                 else
 901                         csk->cdev->csk_send_close_req(csk);
 902         }
 903
 904         spin_unlock_bh(&csk->lock);
 905 }
 906
 907 void cxgbi_sock_fail_act_open(struct cxgbi_sock *csk, int errno)
 908 {
 909         pr_info("csk 0x%p,%u,%lx, %pI4:%u-%pI4:%u, err %d.\n",
 910                         csk, csk->state, csk->flags,
 911                         &csk->saddr.sin_addr.s_addr, csk->saddr.sin_port,
 912                         &csk->daddr.sin_addr.s_addr, csk->daddr.sin_port,
 913                         errno);
 914
 915         cxgbi_sock_set_state(csk, CTP_CONNECTING);
 916         csk->err = errno;
 917         cxgbi_sock_closed(csk);
 918 }
 919 EXPORT_SYMBOL_GPL(cxgbi_sock_fail_act_open);
 920
 921 void cxgbi_sock_act_open_req_arp_failure(void *handle, struct sk_buff *skb)
 922 {
 923         struct cxgbi_sock *csk = (struct cxgbi_sock *)skb->sk;
 924         struct module *owner = csk->cdev->owner;
 925
 926         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 927                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 928         cxgbi_sock_get(csk);
 929         spin_lock_bh(&csk->lock);
 930         if (csk->state == CTP_ACTIVE_OPEN)
 931                 cxgbi_sock_fail_act_open(csk, -EHOSTUNREACH);
 932         spin_unlock_bh(&csk->lock);
 933         cxgbi_sock_put(csk);
 934         __kfree_skb(skb);
 935
 936         module_put(owner);
 937 }
 938 EXPORT_SYMBOL_GPL(cxgbi_sock_act_open_req_arp_failure);
 939
 940 void cxgbi_sock_rcv_abort_rpl(struct cxgbi_sock *csk)
 941 {
 942         cxgbi_sock_get(csk);
 943         spin_lock_bh(&csk->lock);
 944
 945         cxgbi_sock_set_flag(csk, CTPF_ABORT_RPL_RCVD);
 946         if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING)) {
 947                 cxgbi_sock_clear_flag(csk, CTPF_ABORT_RPL_PENDING);
 948                 if (cxgbi_sock_flag(csk, CTPF_ABORT_REQ_RCVD))
 949                         pr_err("csk 0x%p,%u,0x%lx,%u,ABT_RPL_RSS.\n",
 950                                csk, csk->state, csk->flags, csk->tid);
 951                 cxgbi_sock_closed(csk);
 952         }
 953
 954         spin_unlock_bh(&csk->lock);
 955         cxgbi_sock_put(csk);
 956 }
 957 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_abort_rpl);
 958
 959 void cxgbi_sock_rcv_peer_close(struct cxgbi_sock *csk)
 960 {
 961         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 962                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 963         cxgbi_sock_get(csk);
 964         spin_lock_bh(&csk->lock);
 965
 966         if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
 967                 goto done;
 968
 969         switch (csk->state) {
 970         case CTP_ESTABLISHED:
 971                 cxgbi_sock_set_state(csk, CTP_PASSIVE_CLOSE);
 972                 break;
 973         case CTP_ACTIVE_CLOSE:
 974                 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
 975                 break;
 976         case CTP_CLOSE_WAIT_1:
 977                 cxgbi_sock_closed(csk);
 978                 break;
 979         case CTP_ABORTING:
 980                 break;
 981         default:
 982                 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
 983                         csk, csk->state, csk->flags, csk->tid);
 984         }
 985         cxgbi_inform_iscsi_conn_closing(csk);
 986 done:
 987         spin_unlock_bh(&csk->lock);
 988         cxgbi_sock_put(csk);
 989 }
 990 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_peer_close);
 991
 992 void cxgbi_sock_rcv_close_conn_rpl(struct cxgbi_sock *csk, u32 snd_nxt)
 993 {
 994         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 995                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 996         cxgbi_sock_get(csk);
 997         spin_lock_bh(&csk->lock);
 998
 999         csk->snd_una = snd_nxt - 1;
1000         if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
1001                 goto done;
1002
1003         switch (csk->state) {
1004         case CTP_ACTIVE_CLOSE:
1005                 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_1);
1006                 break;
1007         case CTP_CLOSE_WAIT_1:
1008         case CTP_CLOSE_WAIT_2:
1009                 cxgbi_sock_closed(csk);
1010                 break;
1011         case CTP_ABORTING:
1012                 break;
1013         default:
1014                 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
1015                         csk, csk->state, csk->flags, csk->tid);
1016         }
1017 done:
1018         spin_unlock_bh(&csk->lock);
1019         cxgbi_sock_put(csk);
1020 }
1021 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_close_conn_rpl);
1022
1023 void cxgbi_sock_rcv_wr_ack(struct cxgbi_sock *csk, unsigned int credits,
1024                            unsigned int snd_una, int seq_chk)
1025 {
1026         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1027                         "csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, snd_una %u,%d.\n",
1028                         csk, csk->state, csk->flags, csk->tid, credits,
1029                         csk->wr_cred, csk->wr_una_cred, snd_una, seq_chk);
1030
1031         spin_lock_bh(&csk->lock);
1032
1033         csk->wr_cred += credits;
1034         if (csk->wr_una_cred > csk->wr_max_cred - csk->wr_cred)
1035                 csk->wr_una_cred = csk->wr_max_cred - csk->wr_cred;
1036
1037         while (credits) {
1038                 struct sk_buff *p = cxgbi_sock_peek_wr(csk);
1039
1040                 if (unlikely(!p)) {
1041                         pr_err("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, empty.\n",
1042                                 csk, csk->state, csk->flags, csk->tid, credits,
1043                                 csk->wr_cred, csk->wr_una_cred);
1044                         break;
1045                 }
1046
1047                 if (unlikely(credits < p->csum)) {
1048                         pr_warn("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, < %u.\n",
1049                                 csk, csk->state, csk->flags, csk->tid,
1050                                 credits, csk->wr_cred, csk->wr_una_cred,
1051                                 p->csum);
1052                         p->csum -= credits;
1053                         break;
1054                 } else {
1055                         cxgbi_sock_dequeue_wr(csk);
1056                         credits -= p->csum;
1057                         kfree_skb(p);
1058                 }
1059         }
1060
1061         cxgbi_sock_check_wr_invariants(csk);
1062
1063         if (seq_chk) {
1064                 if (unlikely(before(snd_una, csk->snd_una))) {
1065                         pr_warn("csk 0x%p,%u,0x%lx,%u, snd_una %u/%u.",
1066                                 csk, csk->state, csk->flags, csk->tid, snd_una,
1067                                 csk->snd_una);
1068                         goto done;
1069                 }
1070
1071                 if (csk->snd_una != snd_una) {
1072                         csk->snd_una = snd_una;
1073                         dst_confirm(csk->dst);
1074                 }
1075         }
1076
1077         if (skb_queue_len(&csk->write_queue)) {
1078                 if (csk->cdev->csk_push_tx_frames(csk, 0))
1079                         cxgbi_conn_tx_open(csk);
1080         } else
1081                 cxgbi_conn_tx_open(csk);
1082 done:
1083         spin_unlock_bh(&csk->lock);
1084 }
1085 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_wr_ack);
1086
1087 static unsigned int cxgbi_sock_find_best_mtu(struct cxgbi_sock *csk,
1088                                              unsigned short mtu)
1089 {
1090         int i = 0;
1091
1092         while (i < csk->cdev->nmtus - 1 && csk->cdev->mtus[i + 1] <= mtu)
1093                 ++i;
1094
1095         return i;
1096 }
1097
1098 unsigned int cxgbi_sock_select_mss(struct cxgbi_sock *csk, unsigned int pmtu)
1099 {
1100         unsigned int idx;
1101         struct dst_entry *dst = csk->dst;
1102
1103         csk->advmss = dst_metric_advmss(dst);
1104
1105         if (csk->advmss > pmtu - 40)
1106                 csk->advmss = pmtu - 40;
1107         if (csk->advmss < csk->cdev->mtus[0] - 40)
1108                 csk->advmss = csk->cdev->mtus[0] - 40;
1109         idx = cxgbi_sock_find_best_mtu(csk, csk->advmss + 40);
1110
1111         return idx;
1112 }
1113 EXPORT_SYMBOL_GPL(cxgbi_sock_select_mss);
1114
1115 void cxgbi_sock_skb_entail(struct cxgbi_sock *csk, struct sk_buff *skb)
1116 {
1117         cxgbi_skcb_tcp_seq(skb) = csk->write_seq;
1118         __skb_queue_tail(&csk->write_queue, skb);
1119 }
1120 EXPORT_SYMBOL_GPL(cxgbi_sock_skb_entail);
1121
1122 void cxgbi_sock_purge_wr_queue(struct cxgbi_sock *csk)
1123 {
1124         struct sk_buff *skb;
1125
1126         while ((skb = cxgbi_sock_dequeue_wr(csk)) != NULL)
1127                 kfree_skb(skb);
1128 }
1129 EXPORT_SYMBOL_GPL(cxgbi_sock_purge_wr_queue);
1130
1131 void cxgbi_sock_check_wr_invariants(const struct cxgbi_sock *csk)
1132 {
1133         int pending = cxgbi_sock_count_pending_wrs(csk);
1134
1135         if (unlikely(csk->wr_cred + pending != csk->wr_max_cred))
1136                 pr_err("csk 0x%p, tid %u, credit %u + %u != %u.\n",
1137                         csk, csk->tid, csk->wr_cred, pending, csk->wr_max_cred);
1138 }
1139 EXPORT_SYMBOL_GPL(cxgbi_sock_check_wr_invariants);
1140
1141 static inline void
1142 scmd_get_params(struct scsi_cmnd *sc, struct scatterlist **sgl,
1143                 unsigned int *sgcnt, unsigned int *dlen,
1144                 unsigned int prot)
1145 {
1146         struct scsi_data_buffer *sdb = prot ? scsi_prot(sc) : &sc->sdb;
1147
1148         *sgl = sdb->table.sgl;
1149         *sgcnt = sdb->table.nents;
1150         *dlen = sdb->length;
1151         /* Caution: for protection sdb, sdb->length is invalid */
1152 }
1153
1154 void cxgbi_ddp_set_one_ppod(struct cxgbi_pagepod *ppod,
1155                             struct cxgbi_task_tag_info *ttinfo,
1156                             struct scatterlist **sg_pp, unsigned int *sg_off)
1157 {
1158         struct scatterlist *sg = sg_pp ? *sg_pp : NULL;
1159         unsigned int offset = sg_off ? *sg_off : 0;
1160         dma_addr_t addr = 0UL;
1161         unsigned int len = 0;
1162         int i;
1163
1164         memcpy(ppod, &ttinfo->hdr, sizeof(struct cxgbi_pagepod_hdr));
1165
1166         if (sg) {
1167                 addr = sg_dma_address(sg);
1168                 len = sg_dma_len(sg);
1169         }
1170
1171         for (i = 0; i < PPOD_PAGES_MAX; i++) {
1172                 if (sg) {
1173                         ppod->addr[i] = cpu_to_be64(addr + offset);
1174                         offset += PAGE_SIZE;
1175                         if (offset == (len + sg->offset)) {
1176                                 offset = 0;
1177                                 sg = sg_next(sg);
1178                                 if (sg) {
1179                                         addr = sg_dma_address(sg);
1180                                         len = sg_dma_len(sg);
1181                                 }
1182                         }
1183                 } else {
1184                         ppod->addr[i] = 0ULL;
1185                 }
1186         }
1187
1188         /*
1189          * the fifth address needs to be repeated in the next ppod, so do
1190          * not move sg
1191          */
1192         if (sg_pp) {
1193                 *sg_pp = sg;
1194                 *sg_off = offset;
1195         }
1196
1197         if (offset == len) {
1198                 offset = 0;
1199                 sg = sg_next(sg);
1200                 if (sg) {
1201                         addr = sg_dma_address(sg);
1202                         len = sg_dma_len(sg);
1203                 }
1204         }
1205         ppod->addr[i] = sg ? cpu_to_be64(addr + offset) : 0ULL;
1206 }
1207 EXPORT_SYMBOL_GPL(cxgbi_ddp_set_one_ppod);
1208
1209 /*
1210  * APIs interacting with open-iscsi libraries
1211  */
1212
1213 int cxgbi_ddp_ppm_setup(void **ppm_pp, struct cxgbi_device *cdev,
1214                         struct cxgbi_tag_format *tformat,
1215                         unsigned int iscsi_size, unsigned int llimit,
1216                         unsigned int start, unsigned int rsvd_factor,
1217                         unsigned int edram_start, unsigned int edram_size)
1218 {
1219         int err = cxgbi_ppm_init(ppm_pp, cdev->ports[0], cdev->pdev,
1220                                 cdev->lldev, tformat, iscsi_size, llimit, start,
1221                                 rsvd_factor, edram_start, edram_size);
1222
1223         if (err >= 0) {
1224                 struct cxgbi_ppm *ppm = (struct cxgbi_ppm *)(*ppm_pp);
1225
1226                 if (ppm->ppmax < 1024 ||
1227                     ppm->tformat.pgsz_idx_dflt >= DDP_PGIDX_MAX)
1228                         cdev->flags |= CXGBI_FLAG_DDP_OFF;
1229                 err = 0;
1230         } else {
1231                 cdev->flags |= CXGBI_FLAG_DDP_OFF;
1232         }
1233
1234         return err;
1235 }
1236 EXPORT_SYMBOL_GPL(cxgbi_ddp_ppm_setup);
1237
1238 static int cxgbi_ddp_sgl_check(struct scatterlist *sgl, int nents)
1239 {
1240         int i;
1241         int last_sgidx = nents - 1;
1242         struct scatterlist *sg = sgl;
1243
1244         for (i = 0; i < nents; i++, sg = sg_next(sg)) {
1245                 unsigned int len = sg->length + sg->offset;
1246
1247                 if ((sg->offset & 0x3) || (i && sg->offset) ||
1248                     ((i != last_sgidx) && len != PAGE_SIZE)) {
1249                         log_debug(1 << CXGBI_DBG_DDP,
1250                                   "sg %u/%u, %u,%u, not aligned.\n",
1251                                   i, nents, sg->offset, sg->length);
1252                         goto err_out;
1253                 }
1254         }
1255         return 0;
1256 err_out:
1257         return -EINVAL;
1258 }
1259
1260 static int cxgbi_ddp_reserve(struct cxgbi_conn *cconn,
1261                              struct cxgbi_task_data *tdata, u32 sw_tag,
1262                              unsigned int xferlen)
1263 {
1264         struct cxgbi_sock *csk = cconn->cep->csk;
1265         struct cxgbi_device *cdev = csk->cdev;
1266         struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
1267         struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
1268         struct scatterlist *sgl = ttinfo->sgl;
1269         unsigned int sgcnt = ttinfo->nents;
1270         unsigned int sg_offset = sgl->offset;
1271         int err;
1272
1273         if (cdev->flags & CXGBI_FLAG_DDP_OFF) {
1274                 log_debug(1 << CXGBI_DBG_DDP,
1275                           "cdev 0x%p DDP off.\n", cdev);
1276                 return -EINVAL;
1277         }
1278
1279         if (!ppm || xferlen < DDP_THRESHOLD || !sgcnt ||
1280             ppm->tformat.pgsz_idx_dflt >= DDP_PGIDX_MAX) {
1281                 log_debug(1 << CXGBI_DBG_DDP,
1282                           "ppm 0x%p, pgidx %u, xfer %u, sgcnt %u, NO ddp.\n",
1283                           ppm, ppm ? ppm->tformat.pgsz_idx_dflt : DDP_PGIDX_MAX,
1284                           xferlen, ttinfo->nents);
1285                 return -EINVAL;
1286         }
1287
1288         /* make sure the buffer is suitable for ddp */
1289         if (cxgbi_ddp_sgl_check(sgl, sgcnt) < 0)
1290                 return -EINVAL;
1291
1292         ttinfo->nr_pages = (xferlen + sgl->offset + (1 << PAGE_SHIFT) - 1) >>
1293                             PAGE_SHIFT;
1294
1295         /*
1296          * the ddp tag will be used for the itt in the outgoing pdu,
1297          * the itt genrated by libiscsi is saved in the ppm and can be
1298          * retrieved via the ddp tag
1299          */
1300         err = cxgbi_ppm_ppods_reserve(ppm, ttinfo->nr_pages, 0, &ttinfo->idx,
1301                                       &ttinfo->tag, (unsigned long)sw_tag);
1302         if (err < 0) {
1303                 cconn->ddp_full++;
1304                 return err;
1305         }
1306         ttinfo->npods = err;
1307
1308          /* setup dma from scsi command sgl */
1309         sgl->offset = 0;
1310         err = dma_map_sg(&ppm->pdev->dev, sgl, sgcnt, DMA_FROM_DEVICE);
1311         sgl->offset = sg_offset;
1312         if (err == 0) {
1313                 pr_info("%s: 0x%x, xfer %u, sgl %u dma mapping err.\n",
1314                         __func__, sw_tag, xferlen, sgcnt);
1315                 goto rel_ppods;
1316         }
1317         if (err != ttinfo->nr_pages) {
1318                 log_debug(1 << CXGBI_DBG_DDP,
1319                           "%s: sw tag 0x%x, xfer %u, sgl %u, dma count %d.\n",
1320                           __func__, sw_tag, xferlen, sgcnt, err);
1321         }
1322
1323         ttinfo->flags |= CXGBI_PPOD_INFO_FLAG_MAPPED;
1324         ttinfo->cid = csk->port_id;
1325
1326         cxgbi_ppm_make_ppod_hdr(ppm, ttinfo->tag, csk->tid, sgl->offset,
1327                                 xferlen, &ttinfo->hdr);
1328
1329         if (cdev->flags & CXGBI_FLAG_USE_PPOD_OFLDQ) {
1330                 /* write ppod from xmit_pdu (of iscsi_scsi_command pdu) */
1331                 ttinfo->flags |= CXGBI_PPOD_INFO_FLAG_VALID;
1332         } else {
1333                 /* write ppod from control queue now */
1334                 err = cdev->csk_ddp_set_map(ppm, csk, ttinfo);
1335                 if (err < 0)
1336                         goto rel_ppods;
1337         }
1338
1339         return 0;
1340
1341 rel_ppods:
1342         cxgbi_ppm_ppod_release(ppm, ttinfo->idx);
1343
1344         if (ttinfo->flags & CXGBI_PPOD_INFO_FLAG_MAPPED) {
1345                 ttinfo->flags &= ~CXGBI_PPOD_INFO_FLAG_MAPPED;
1346                 dma_unmap_sg(&ppm->pdev->dev, sgl, sgcnt, DMA_FROM_DEVICE);
1347         }
1348         return -EINVAL;
1349 }
1350
1351 static void task_release_itt(struct iscsi_task *task, itt_t hdr_itt)
1352 {
1353         struct scsi_cmnd *sc = task->sc;
1354         struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
1355         struct cxgbi_conn *cconn = tcp_conn->dd_data;
1356         struct cxgbi_device *cdev = cconn->chba->cdev;
1357         struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
1358         u32 tag = ntohl((__force u32)hdr_itt);
1359
1360         log_debug(1 << CXGBI_DBG_DDP,
1361                   "cdev 0x%p, task 0x%p, release tag 0x%x.\n",
1362                   cdev, task, tag);
1363         if (sc && sc->sc_data_direction == DMA_FROM_DEVICE &&
1364             cxgbi_ppm_is_ddp_tag(ppm, tag)) {
1365                 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1366                 struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
1367
1368                 if (!(cdev->flags & CXGBI_FLAG_USE_PPOD_OFLDQ))
1369                         cdev->csk_ddp_clear_map(cdev, ppm, ttinfo);
1370                 cxgbi_ppm_ppod_release(ppm, ttinfo->idx);
1371                 dma_unmap_sg(&ppm->pdev->dev, ttinfo->sgl, ttinfo->nents,
1372                              DMA_FROM_DEVICE);
1373         }
1374 }
1375
1376 static inline u32 cxgbi_build_sw_tag(u32 idx, u32 age)
1377 {
1378         /* assume idx and age both are < 0x7FFF (32767) */
1379         return (idx << 16) | age;
1380 }
1381
1382 static int task_reserve_itt(struct iscsi_task *task, itt_t *hdr_itt)
1383 {
1384         struct scsi_cmnd *sc = task->sc;
1385         struct iscsi_conn *conn = task->conn;
1386         struct iscsi_session *sess = conn->session;
1387         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1388         struct cxgbi_conn *cconn = tcp_conn->dd_data;
1389         struct cxgbi_device *cdev = cconn->chba->cdev;
1390         struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
1391         u32 sw_tag = cxgbi_build_sw_tag(task->itt, sess->age);
1392         u32 tag = 0;
1393         int err = -EINVAL;
1394
1395         if (sc && sc->sc_data_direction == DMA_FROM_DEVICE) {
1396                 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1397                 struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
1398
1399                 scmd_get_params(sc, &ttinfo->sgl, &ttinfo->nents,
1400                                 &tdata->dlen, 0);
1401                 err = cxgbi_ddp_reserve(cconn, tdata, sw_tag, tdata->dlen);
1402                 if (!err)
1403                         tag = ttinfo->tag;
1404                 else
1405                          log_debug(1 << CXGBI_DBG_DDP,
1406                                    "csk 0x%p, R task 0x%p, %u,%u, no ddp.\n",
1407                                    cconn->cep->csk, task, tdata->dlen,
1408                                    ttinfo->nents);
1409         }
1410
1411         if (err < 0) {
1412                 err = cxgbi_ppm_make_non_ddp_tag(ppm, sw_tag, &tag);
1413                 if (err < 0)
1414                         return err;
1415         }
1416         /*  the itt need to sent in big-endian order */
1417         *hdr_itt = (__force itt_t)htonl(tag);
1418
1419         log_debug(1 << CXGBI_DBG_DDP,
1420                   "cdev 0x%p, task 0x%p, 0x%x(0x%x,0x%x)->0x%x/0x%x.\n",
1421                   cdev, task, sw_tag, task->itt, sess->age, tag, *hdr_itt);
1422         return 0;
1423 }
1424
1425 void cxgbi_parse_pdu_itt(struct iscsi_conn *conn, itt_t itt, int *idx, int *age)
1426 {
1427         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1428         struct cxgbi_conn *cconn = tcp_conn->dd_data;
1429         struct cxgbi_device *cdev = cconn->chba->cdev;
1430         struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
1431         u32 tag = ntohl((__force u32)itt);
1432         u32 sw_bits;
1433
1434         if (ppm) {
1435                 if (cxgbi_ppm_is_ddp_tag(ppm, tag))
1436                         sw_bits = cxgbi_ppm_get_tag_caller_data(ppm, tag);
1437                 else
1438                         sw_bits = cxgbi_ppm_decode_non_ddp_tag(ppm, tag);
1439         } else {
1440                 sw_bits = tag;
1441         }
1442
1443         cxgbi_decode_sw_tag(sw_bits, idx, age);
1444         log_debug(1 << CXGBI_DBG_DDP,
1445                   "cdev 0x%p, tag 0x%x/0x%x, -> 0x%x(0x%x,0x%x).\n",
1446                   cdev, tag, itt, sw_bits, idx ? *idx : 0xFFFFF,
1447                   age ? *age : 0xFF);
1448 }
1449 EXPORT_SYMBOL_GPL(cxgbi_parse_pdu_itt);
1450
1451 void cxgbi_conn_tx_open(struct cxgbi_sock *csk)
1452 {
1453         struct iscsi_conn *conn = csk->user_data;
1454
1455         if (conn) {
1456                 log_debug(1 << CXGBI_DBG_SOCK,
1457                         "csk 0x%p, cid %d.\n", csk, conn->id);
1458                 iscsi_conn_queue_work(conn);
1459         }
1460 }
1461 EXPORT_SYMBOL_GPL(cxgbi_conn_tx_open);
1462
1463 /*
1464  * pdu receive, interact with libiscsi_tcp
1465  */
1466 static inline int read_pdu_skb(struct iscsi_conn *conn,
1467                                struct sk_buff *skb,
1468                                unsigned int offset,
1469                                int offloaded)
1470 {
1471         int status = 0;
1472         int bytes_read;
1473
1474         bytes_read = iscsi_tcp_recv_skb(conn, skb, offset, offloaded, &status);
1475         switch (status) {
1476         case ISCSI_TCP_CONN_ERR:
1477                 pr_info("skb 0x%p, off %u, %d, TCP_ERR.\n",
1478                           skb, offset, offloaded);
1479                 return -EIO;
1480         case ISCSI_TCP_SUSPENDED:
1481                 log_debug(1 << CXGBI_DBG_PDU_RX,
1482                         "skb 0x%p, off %u, %d, TCP_SUSPEND, rc %d.\n",
1483                         skb, offset, offloaded, bytes_read);
1484                 /* no transfer - just have caller flush queue */
1485                 return bytes_read;
1486         case ISCSI_TCP_SKB_DONE:
1487                 pr_info("skb 0x%p, off %u, %d, TCP_SKB_DONE.\n",
1488                         skb, offset, offloaded);
1489                 /*
1490                  * pdus should always fit in the skb and we should get
1491                  * segment done notifcation.
1492                  */
1493                 iscsi_conn_printk(KERN_ERR, conn, "Invalid pdu or skb.");
1494                 return -EFAULT;
1495         case ISCSI_TCP_SEGMENT_DONE:
1496                 log_debug(1 << CXGBI_DBG_PDU_RX,
1497                         "skb 0x%p, off %u, %d, TCP_SEG_DONE, rc %d.\n",
1498                         skb, offset, offloaded, bytes_read);
1499                 return bytes_read;
1500         default:
1501                 pr_info("skb 0x%p, off %u, %d, invalid status %d.\n",
1502                         skb, offset, offloaded, status);
1503                 return -EINVAL;
1504         }
1505 }
1506
1507 static int
1508 skb_read_pdu_bhs(struct cxgbi_sock *csk, struct iscsi_conn *conn,
1509                  struct sk_buff *skb)
1510 {
1511         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1512         int err;
1513
1514         log_debug(1 << CXGBI_DBG_PDU_RX,
1515                 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1516                 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1517
1518         if (!iscsi_tcp_recv_segment_is_hdr(tcp_conn)) {
1519                 pr_info("conn 0x%p, skb 0x%p, not hdr.\n", conn, skb);
1520                 iscsi_conn_failure(conn, ISCSI_ERR_PROTO);
1521                 return -EIO;
1522         }
1523
1524         if (conn->hdrdgst_en &&
1525             cxgbi_skcb_test_flag(skb, SKCBF_RX_HCRC_ERR)) {
1526                 pr_info("conn 0x%p, skb 0x%p, hcrc.\n", conn, skb);
1527                 iscsi_conn_failure(conn, ISCSI_ERR_HDR_DGST);
1528                 return -EIO;
1529         }
1530
1531         if (cxgbi_skcb_test_flag(skb, SKCBF_RX_ISCSI_COMPL) &&
1532             cxgbi_skcb_test_flag(skb, SKCBF_RX_DATA_DDPD)) {
1533                 /* If completion flag is set and data is directly
1534                  * placed in to the host memory then update
1535                  * task->exp_datasn to the datasn in completion
1536                  * iSCSI hdr as T6 adapter generates completion only
1537                  * for the last pdu of a sequence.
1538                  */
1539                 itt_t itt = ((struct iscsi_data *)skb->data)->itt;
1540                 struct iscsi_task *task = iscsi_itt_to_ctask(conn, itt);
1541                 u32 data_sn = be32_to_cpu(((struct iscsi_data *)
1542                                                         skb->data)->datasn);
1543                 if (task && task->sc) {
1544                         struct iscsi_tcp_task *tcp_task = task->dd_data;
1545
1546                         tcp_task->exp_datasn = data_sn;
1547                 }
1548         }
1549
1550         err = read_pdu_skb(conn, skb, 0, 0);
1551         if (likely(err >= 0)) {
1552                 struct iscsi_hdr *hdr = (struct iscsi_hdr *)skb->data;
1553                 u8 opcode = hdr->opcode & ISCSI_OPCODE_MASK;
1554
1555                 if (unlikely(opcode == ISCSI_OP_LOGOUT_RSP))
1556                         cxgbi_sock_set_flag(csk, CTPF_LOGOUT_RSP_RCVD);
1557         }
1558
1559         return err;
1560 }
1561
1562 static int skb_read_pdu_data(struct iscsi_conn *conn, struct sk_buff *lskb,
1563                              struct sk_buff *skb, unsigned int offset)
1564 {
1565         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1566         bool offloaded = 0;
1567         int opcode = tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK;
1568
1569         log_debug(1 << CXGBI_DBG_PDU_RX,
1570                 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1571                 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1572
1573         if (conn->datadgst_en &&
1574             cxgbi_skcb_test_flag(lskb, SKCBF_RX_DCRC_ERR)) {
1575                 pr_info("conn 0x%p, skb 0x%p, dcrc 0x%lx.\n",
1576                         conn, lskb, cxgbi_skcb_flags(lskb));
1577                 iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST);
1578                 return -EIO;
1579         }
1580
1581         if (iscsi_tcp_recv_segment_is_hdr(tcp_conn))
1582                 return 0;
1583
1584         /* coalesced, add header digest length */
1585         if (lskb == skb && conn->hdrdgst_en)
1586                 offset += ISCSI_DIGEST_SIZE;
1587
1588         if (cxgbi_skcb_test_flag(lskb, SKCBF_RX_DATA_DDPD))
1589                 offloaded = 1;
1590
1591         if (opcode == ISCSI_OP_SCSI_DATA_IN)
1592                 log_debug(1 << CXGBI_DBG_PDU_RX,
1593                         "skb 0x%p, op 0x%x, itt 0x%x, %u %s ddp'ed.\n",
1594                         skb, opcode, ntohl(tcp_conn->in.hdr->itt),
1595                         tcp_conn->in.datalen, offloaded ? "is" : "not");
1596
1597         return read_pdu_skb(conn, skb, offset, offloaded);
1598 }
1599
1600 static void csk_return_rx_credits(struct cxgbi_sock *csk, int copied)
1601 {
1602         struct cxgbi_device *cdev = csk->cdev;
1603         int must_send;
1604         u32 credits;
1605
1606         log_debug(1 << CXGBI_DBG_PDU_RX,
1607                 "csk 0x%p,%u,0x%lx,%u, seq %u, wup %u, thre %u, %u.\n",
1608                 csk, csk->state, csk->flags, csk->tid, csk->copied_seq,
1609                 csk->rcv_wup, cdev->rx_credit_thres,
1610                 csk->rcv_win);
1611
1612         if (!cdev->rx_credit_thres)
1613                 return;
1614
1615         if (csk->state != CTP_ESTABLISHED)
1616                 return;
1617
1618         credits = csk->copied_seq - csk->rcv_wup;
1619         if (unlikely(!credits))
1620                 return;
1621         must_send = credits + 16384 >= csk->rcv_win;
1622         if (must_send || credits >= cdev->rx_credit_thres)
1623                 csk->rcv_wup += cdev->csk_send_rx_credits(csk, credits);
1624 }
1625
1626 void cxgbi_conn_pdu_ready(struct cxgbi_sock *csk)
1627 {
1628         struct cxgbi_device *cdev = csk->cdev;
1629         struct iscsi_conn *conn = csk->user_data;
1630         struct sk_buff *skb;
1631         unsigned int read = 0;
1632         int err = 0;
1633
1634         log_debug(1 << CXGBI_DBG_PDU_RX,
1635                 "csk 0x%p, conn 0x%p.\n", csk, conn);
1636
1637         if (unlikely(!conn || test_bit(ISCSI_CONN_FLAG_SUSPEND_RX, &conn->flags))) {
1638                 log_debug(1 << CXGBI_DBG_PDU_RX,
1639                         "csk 0x%p, conn 0x%p, id %d, conn flags 0x%lx!\n",
1640                         csk, conn, conn ? conn->id : 0xFF,
1641                         conn ? conn->flags : 0xFF);
1642                 return;
1643         }
1644
1645         while (!err) {
1646                 skb = skb_peek(&csk->receive_queue);
1647                 if (!skb ||
1648                     !(cxgbi_skcb_test_flag(skb, SKCBF_RX_STATUS))) {
1649                         if (skb)
1650                                 log_debug(1 << CXGBI_DBG_PDU_RX,
1651                                         "skb 0x%p, NOT ready 0x%lx.\n",
1652                                         skb, cxgbi_skcb_flags(skb));
1653                         break;
1654                 }
1655                 __skb_unlink(skb, &csk->receive_queue);
1656
1657                 read += cxgbi_skcb_rx_pdulen(skb);
1658                 log_debug(1 << CXGBI_DBG_PDU_RX,
1659                         "csk 0x%p, skb 0x%p,%u,f 0x%lx, pdu len %u.\n",
1660                         csk, skb, skb->len, cxgbi_skcb_flags(skb),
1661                         cxgbi_skcb_rx_pdulen(skb));
1662
1663                 if (cxgbi_skcb_test_flag(skb, SKCBF_RX_COALESCED)) {
1664                         err = skb_read_pdu_bhs(csk, conn, skb);
1665                         if (err < 0) {
1666                                 pr_err("coalesced bhs, csk 0x%p, skb 0x%p,%u, "
1667                                         "f 0x%lx, plen %u.\n",
1668                                         csk, skb, skb->len,
1669                                         cxgbi_skcb_flags(skb),
1670                                         cxgbi_skcb_rx_pdulen(skb));
1671                                 goto skb_done;
1672                         }
1673                         err = skb_read_pdu_data(conn, skb, skb,
1674                                                 err + cdev->skb_rx_extra);
1675                         if (err < 0)
1676                                 pr_err("coalesced data, csk 0x%p, skb 0x%p,%u, "
1677                                         "f 0x%lx, plen %u.\n",
1678                                         csk, skb, skb->len,
1679                                         cxgbi_skcb_flags(skb),
1680                                         cxgbi_skcb_rx_pdulen(skb));
1681                 } else {
1682                         err = skb_read_pdu_bhs(csk, conn, skb);
1683                         if (err < 0) {
1684                                 pr_err("bhs, csk 0x%p, skb 0x%p,%u, "
1685                                         "f 0x%lx, plen %u.\n",
1686                                         csk, skb, skb->len,
1687                                         cxgbi_skcb_flags(skb),
1688                                         cxgbi_skcb_rx_pdulen(skb));
1689                                 goto skb_done;
1690                         }
1691
1692                         if (cxgbi_skcb_test_flag(skb, SKCBF_RX_DATA)) {
1693                                 struct sk_buff *dskb;
1694
1695                                 dskb = skb_peek(&csk->receive_queue);
1696                                 if (!dskb) {
1697                                         pr_err("csk 0x%p, skb 0x%p,%u, f 0x%lx,"
1698                                                 " plen %u, NO data.\n",
1699                                                 csk, skb, skb->len,
1700                                                 cxgbi_skcb_flags(skb),
1701                                                 cxgbi_skcb_rx_pdulen(skb));
1702                                         err = -EIO;
1703                                         goto skb_done;
1704                                 }
1705                                 __skb_unlink(dskb, &csk->receive_queue);
1706
1707                                 err = skb_read_pdu_data(conn, skb, dskb, 0);
1708                                 if (err < 0)
1709                                         pr_err("data, csk 0x%p, skb 0x%p,%u, "
1710                                                 "f 0x%lx, plen %u, dskb 0x%p,"
1711                                                 "%u.\n",
1712                                                 csk, skb, skb->len,
1713                                                 cxgbi_skcb_flags(skb),
1714                                                 cxgbi_skcb_rx_pdulen(skb),
1715                                                 dskb, dskb->len);
1716                                 __kfree_skb(dskb);
1717                         } else
1718                                 err = skb_read_pdu_data(conn, skb, skb, 0);
1719                 }
1720 skb_done:
1721                 __kfree_skb(skb);
1722
1723                 if (err < 0)
1724                         break;
1725         }
1726
1727         log_debug(1 << CXGBI_DBG_PDU_RX, "csk 0x%p, read %u.\n", csk, read);
1728         if (read) {
1729                 csk->copied_seq += read;
1730                 csk_return_rx_credits(csk, read);
1731                 conn->rxdata_octets += read;
1732         }
1733
1734         if (err < 0) {
1735                 pr_info("csk 0x%p, 0x%p, rx failed %d, read %u.\n",
1736                         csk, conn, err, read);
1737                 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1738         }
1739 }
1740 EXPORT_SYMBOL_GPL(cxgbi_conn_pdu_ready);
1741
1742 static int sgl_seek_offset(struct scatterlist *sgl, unsigned int sgcnt,
1743                                 unsigned int offset, unsigned int *off,
1744                                 struct scatterlist **sgp)
1745 {
1746         int i;
1747         struct scatterlist *sg;
1748
1749         for_each_sg(sgl, sg, sgcnt, i) {
1750                 if (offset < sg->length) {
1751                         *off = offset;
1752                         *sgp = sg;
1753                         return 0;
1754                 }
1755                 offset -= sg->length;
1756         }
1757         return -EFAULT;
1758 }
1759
1760 static int
1761 sgl_read_to_frags(struct scatterlist *sg, unsigned int sgoffset,
1762                   unsigned int dlen, struct page_frag *frags,
1763                   int frag_max, u32 *dlimit)
1764 {
1765         unsigned int datalen = dlen;
1766         unsigned int sglen = sg->length - sgoffset;
1767         struct page *page = sg_page(sg);
1768         int i;
1769
1770         i = 0;
1771         do {
1772                 unsigned int copy;
1773
1774                 if (!sglen) {
1775                         sg = sg_next(sg);
1776                         if (!sg) {
1777                                 pr_warn("sg %d NULL, len %u/%u.\n",
1778                                         i, datalen, dlen);
1779                                 return -EINVAL;
1780                         }
1781                         sgoffset = 0;
1782                         sglen = sg->length;
1783                         page = sg_page(sg);
1784
1785                 }
1786                 copy = min(datalen, sglen);
1787                 if (i && page == frags[i - 1].page &&
1788                     sgoffset + sg->offset ==
1789                         frags[i - 1].offset + frags[i - 1].size) {
1790                         frags[i - 1].size += copy;
1791                 } else {
1792                         if (i >= frag_max) {
1793                                 pr_warn("too many pages %u, dlen %u.\n",
1794                                         frag_max, dlen);
1795                                 *dlimit = dlen - datalen;
1796                                 return -EINVAL;
1797                         }
1798
1799                         frags[i].page = page;
1800                         frags[i].offset = sg->offset + sgoffset;
1801                         frags[i].size = copy;
1802                         i++;
1803                 }
1804                 datalen -= copy;
1805                 sgoffset += copy;
1806                 sglen -= copy;
1807         } while (datalen);
1808
1809         return i;
1810 }
1811
1812 static void cxgbi_task_data_sgl_check(struct iscsi_task *task)
1813 {
1814         struct scsi_cmnd *sc = task->sc;
1815         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1816         struct scatterlist *sg, *sgl = NULL;
1817         u32 sgcnt = 0;
1818         int i;
1819
1820         tdata->flags = CXGBI_TASK_SGL_CHECKED;
1821         if (!sc)
1822                 return;
1823
1824         scmd_get_params(sc, &sgl, &sgcnt, &tdata->dlen, 0);
1825         if (!sgl || !sgcnt) {
1826                 tdata->flags |= CXGBI_TASK_SGL_COPY;
1827                 return;
1828         }
1829
1830         for_each_sg(sgl, sg, sgcnt, i) {
1831                 if (page_count(sg_page(sg)) < 1) {
1832                         tdata->flags |= CXGBI_TASK_SGL_COPY;
1833                         return;
1834                 }
1835         }
1836 }
1837
1838 static int
1839 cxgbi_task_data_sgl_read(struct iscsi_task *task, u32 offset, u32 count,
1840                          u32 *dlimit)
1841 {
1842         struct scsi_cmnd *sc = task->sc;
1843         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1844         struct scatterlist *sgl = NULL;
1845         struct scatterlist *sg;
1846         u32 dlen = 0;
1847         u32 sgcnt;
1848         int err;
1849
1850         if (!sc)
1851                 return 0;
1852
1853         scmd_get_params(sc, &sgl, &sgcnt, &dlen, 0);
1854         if (!sgl || !sgcnt)
1855                 return 0;
1856
1857         err = sgl_seek_offset(sgl, sgcnt, offset, &tdata->sgoffset, &sg);
1858         if (err < 0) {
1859                 pr_warn("tpdu max, sgl %u, bad offset %u/%u.\n",
1860                         sgcnt, offset, tdata->dlen);
1861                 return err;
1862         }
1863         err = sgl_read_to_frags(sg, tdata->sgoffset, count,
1864                                 tdata->frags, MAX_SKB_FRAGS, dlimit);
1865         if (err < 0) {
1866                 log_debug(1 << CXGBI_DBG_ISCSI,
1867                           "sgl max limit, sgl %u, offset %u, %u/%u, dlimit %u.\n",
1868                           sgcnt, offset, count, tdata->dlen, *dlimit);
1869                 return err;
1870         }
1871         tdata->offset = offset;
1872         tdata->count = count;
1873         tdata->nr_frags = err;
1874         tdata->total_count = count;
1875         tdata->total_offset = offset;
1876
1877         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
1878                   "%s: offset %u, count %u,\n"
1879                   "err %u, total_count %u, total_offset %u\n",
1880                   __func__, offset, count, err,  tdata->total_count, tdata->total_offset);
1881
1882         return 0;
1883 }
1884
1885 int cxgbi_conn_alloc_pdu(struct iscsi_task *task, u8 op)
1886 {
1887         struct iscsi_conn *conn = task->conn;
1888         struct iscsi_session *session = task->conn->session;
1889         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1890         struct cxgbi_conn *cconn = tcp_conn->dd_data;
1891         struct cxgbi_device *cdev = cconn->chba->cdev;
1892         struct cxgbi_sock *csk = cconn->cep ? cconn->cep->csk : NULL;
1893         struct iscsi_tcp_task *tcp_task = task->dd_data;
1894         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1895         struct scsi_cmnd *sc = task->sc;
1896         u32 headroom = SKB_TX_ISCSI_PDU_HEADER_MAX;
1897         u32 max_txdata_len = conn->max_xmit_dlength;
1898         u32 iso_tx_rsvd = 0, local_iso_info = 0;
1899         u32 last_tdata_offset, last_tdata_count;
1900         int err = 0;
1901
1902         if (!tcp_task) {
1903                 pr_err("task 0x%p, tcp_task 0x%p, tdata 0x%p.\n",
1904                        task, tcp_task, tdata);
1905                 return -ENOMEM;
1906         }
1907         if (!csk) {
1908                 pr_err("task 0x%p, csk gone.\n", task);
1909                 return -EPIPE;
1910         }
1911
1912         op &= ISCSI_OPCODE_MASK;
1913
1914         tcp_task->dd_data = tdata;
1915         task->hdr = NULL;
1916
1917         last_tdata_count = tdata->count;
1918         last_tdata_offset = tdata->offset;
1919
1920         if ((op == ISCSI_OP_SCSI_DATA_OUT) ||
1921             ((op == ISCSI_OP_SCSI_CMD) &&
1922              (sc->sc_data_direction == DMA_TO_DEVICE))) {
1923                 u32 remaining_data_tosend, dlimit = 0;
1924                 u32 max_pdu_size, max_num_pdu, num_pdu;
1925                 u32 count;
1926
1927                 /* Preserve conn->max_xmit_dlength because it can get updated to
1928                  * ISO data size.
1929                  */
1930                 if (task->state == ISCSI_TASK_PENDING)
1931                         tdata->max_xmit_dlength = conn->max_xmit_dlength;
1932
1933                 if (!tdata->offset)
1934                         cxgbi_task_data_sgl_check(task);
1935
1936                 remaining_data_tosend =
1937                         tdata->dlen - tdata->offset - tdata->count;
1938
1939 recalculate_sgl:
1940                 max_txdata_len = tdata->max_xmit_dlength;
1941                 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
1942                           "tdata->dlen %u, remaining to send %u "
1943                           "conn->max_xmit_dlength %u, "
1944                           "tdata->max_xmit_dlength %u\n",
1945                           tdata->dlen, remaining_data_tosend,
1946                           conn->max_xmit_dlength, tdata->max_xmit_dlength);
1947
1948                 if (cdev->skb_iso_txhdr && !csk->disable_iso &&
1949                     (remaining_data_tosend > tdata->max_xmit_dlength) &&
1950                     !(remaining_data_tosend % 4)) {
1951                         u32 max_iso_data;
1952
1953                         if ((op == ISCSI_OP_SCSI_CMD) &&
1954                             session->initial_r2t_en)
1955                                 goto no_iso;
1956
1957                         max_pdu_size = tdata->max_xmit_dlength +
1958                                        ISCSI_PDU_NONPAYLOAD_LEN;
1959                         max_iso_data = rounddown(CXGBI_MAX_ISO_DATA_IN_SKB,
1960                                                  csk->advmss);
1961                         max_num_pdu = max_iso_data / max_pdu_size;
1962
1963                         num_pdu = (remaining_data_tosend +
1964                                    tdata->max_xmit_dlength - 1) /
1965                                   tdata->max_xmit_dlength;
1966
1967                         if (num_pdu > max_num_pdu)
1968                                 num_pdu = max_num_pdu;
1969
1970                         conn->max_xmit_dlength = tdata->max_xmit_dlength * num_pdu;
1971                         max_txdata_len = conn->max_xmit_dlength;
1972                         iso_tx_rsvd = cdev->skb_iso_txhdr;
1973                         local_iso_info = sizeof(struct cxgbi_iso_info);
1974
1975                         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
1976                                   "max_pdu_size %u, max_num_pdu %u, "
1977                                   "max_txdata %u, num_pdu %u\n",
1978                                   max_pdu_size, max_num_pdu,
1979                                   max_txdata_len, num_pdu);
1980                 }
1981 no_iso:
1982                 count  = min_t(u32, max_txdata_len, remaining_data_tosend);
1983                 err = cxgbi_task_data_sgl_read(task,
1984                                                tdata->offset + tdata->count,
1985                                                count, &dlimit);
1986                 if (unlikely(err < 0)) {
1987                         log_debug(1 << CXGBI_DBG_ISCSI,
1988                                   "task 0x%p, tcp_task 0x%p, tdata 0x%p, "
1989                                   "sgl err %d, count %u, dlimit %u\n",
1990                                   task, tcp_task, tdata, err, count, dlimit);
1991                         if (dlimit) {
1992                                 remaining_data_tosend =
1993                                         rounddown(dlimit,
1994                                                   tdata->max_xmit_dlength);
1995                                 if (!remaining_data_tosend)
1996                                         remaining_data_tosend = dlimit;
1997
1998                                 dlimit = 0;
1999
2000                                 conn->max_xmit_dlength = remaining_data_tosend;
2001                                 goto recalculate_sgl;
2002                         }
2003
2004                         pr_err("task 0x%p, tcp_task 0x%p, tdata 0x%p, "
2005                                 "sgl err %d\n",
2006                                 task, tcp_task, tdata, err);
2007                         goto ret_err;
2008                 }
2009
2010                 if ((tdata->flags & CXGBI_TASK_SGL_COPY) ||
2011                     (tdata->nr_frags > MAX_SKB_FRAGS))
2012                         headroom += conn->max_xmit_dlength;
2013         }
2014
2015         tdata->skb = alloc_skb(local_iso_info + cdev->skb_tx_rsvd +
2016                                iso_tx_rsvd + headroom, GFP_ATOMIC);
2017         if (!tdata->skb) {
2018                 tdata->count = last_tdata_count;
2019                 tdata->offset = last_tdata_offset;
2020                 err = -ENOMEM;
2021                 goto ret_err;
2022         }
2023
2024         skb_reserve(tdata->skb, local_iso_info + cdev->skb_tx_rsvd +
2025                     iso_tx_rsvd);
2026
2027         if (task->sc) {
2028                 task->hdr = (struct iscsi_hdr *)tdata->skb->data;
2029         } else {
2030                 task->hdr = kzalloc(SKB_TX_ISCSI_PDU_HEADER_MAX, GFP_ATOMIC);
2031                 if (!task->hdr) {
2032                         __kfree_skb(tdata->skb);
2033                         tdata->skb = NULL;
2034                         return -ENOMEM;
2035                 }
2036         }
2037
2038         task->hdr_max = SKB_TX_ISCSI_PDU_HEADER_MAX;
2039
2040         if (iso_tx_rsvd)
2041                 cxgbi_skcb_set_flag(tdata->skb, SKCBF_TX_ISO);
2042
2043         /* data_out uses scsi_cmd's itt */
2044         if (op != ISCSI_OP_SCSI_DATA_OUT)
2045                 task_reserve_itt(task, &task->hdr->itt);
2046
2047         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2048                   "task 0x%p, op 0x%x, skb 0x%p,%u+%u/%u, itt 0x%x.\n",
2049                   task, op, tdata->skb, cdev->skb_tx_rsvd, headroom,
2050                   conn->max_xmit_dlength, be32_to_cpu(task->hdr->itt));
2051
2052         return 0;
2053
2054 ret_err:
2055         conn->max_xmit_dlength = tdata->max_xmit_dlength;
2056         return err;
2057 }
2058 EXPORT_SYMBOL_GPL(cxgbi_conn_alloc_pdu);
2059
2060 static int
2061 cxgbi_prep_iso_info(struct iscsi_task *task, struct sk_buff *skb,
2062                     u32 count)
2063 {
2064         struct cxgbi_iso_info *iso_info = (struct cxgbi_iso_info *)skb->head;
2065         struct iscsi_r2t_info *r2t;
2066         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2067         struct iscsi_conn *conn = task->conn;
2068         struct iscsi_session *session = conn->session;
2069         struct iscsi_tcp_task *tcp_task = task->dd_data;
2070         u32 burst_size = 0, r2t_dlength = 0, dlength;
2071         u32 max_pdu_len = tdata->max_xmit_dlength;
2072         u32 segment_offset = 0;
2073         u32 num_pdu;
2074
2075         if (unlikely(!cxgbi_skcb_test_flag(skb, SKCBF_TX_ISO)))
2076                 return 0;
2077
2078         memset(iso_info, 0, sizeof(struct cxgbi_iso_info));
2079
2080         if (task->hdr->opcode == ISCSI_OP_SCSI_CMD && session->imm_data_en) {
2081                 iso_info->flags |= CXGBI_ISO_INFO_IMM_ENABLE;
2082                 burst_size = count;
2083         }
2084
2085         dlength = ntoh24(task->hdr->dlength);
2086         dlength = min(dlength, max_pdu_len);
2087         hton24(task->hdr->dlength, dlength);
2088
2089         num_pdu = (count + max_pdu_len - 1) / max_pdu_len;
2090
2091         if (iscsi_task_has_unsol_data(task))
2092                 r2t = &task->unsol_r2t;
2093         else
2094                 r2t = tcp_task->r2t;
2095
2096         if (r2t) {
2097                 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2098                           "count %u, tdata->count %u, num_pdu %u,"
2099                           "task->hdr_len %u, r2t->data_length %u, r2t->sent %u\n",
2100                           count, tdata->count, num_pdu, task->hdr_len,
2101                           r2t->data_length, r2t->sent);
2102
2103                 r2t_dlength = r2t->data_length - r2t->sent;
2104                 segment_offset = r2t->sent;
2105                 r2t->datasn += num_pdu - 1;
2106         }
2107
2108         if (!r2t || !r2t->sent)
2109                 iso_info->flags |= CXGBI_ISO_INFO_FSLICE;
2110
2111         if (task->hdr->flags & ISCSI_FLAG_CMD_FINAL)
2112                 iso_info->flags |= CXGBI_ISO_INFO_LSLICE;
2113
2114         task->hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
2115
2116         iso_info->op = task->hdr->opcode;
2117         iso_info->ahs = task->hdr->hlength;
2118         iso_info->num_pdu = num_pdu;
2119         iso_info->mpdu = max_pdu_len;
2120         iso_info->burst_size = (burst_size + r2t_dlength) >> 2;
2121         iso_info->len = count + task->hdr_len;
2122         iso_info->segment_offset = segment_offset;
2123
2124         cxgbi_skcb_tx_iscsi_hdrlen(skb) = task->hdr_len;
2125         return 0;
2126 }
2127
2128 static inline void tx_skb_setmode(struct sk_buff *skb, int hcrc, int dcrc)
2129 {
2130         if (hcrc || dcrc) {
2131                 u8 submode = 0;
2132
2133                 if (hcrc)
2134                         submode |= 1;
2135                 if (dcrc)
2136                         submode |= 2;
2137                 cxgbi_skcb_tx_ulp_mode(skb) = (ULP2_MODE_ISCSI << 4) | submode;
2138         } else
2139                 cxgbi_skcb_tx_ulp_mode(skb) = 0;
2140 }
2141
2142 static struct page *rsvd_page;
2143
2144 int cxgbi_conn_init_pdu(struct iscsi_task *task, unsigned int offset,
2145                               unsigned int count)
2146 {
2147         struct iscsi_conn *conn = task->conn;
2148         struct iscsi_tcp_task *tcp_task = task->dd_data;
2149         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2150         struct sk_buff *skb;
2151         struct scsi_cmnd *sc = task->sc;
2152         u32 expected_count, expected_offset;
2153         u32 datalen = count, dlimit = 0;
2154         u32 i, padlen = iscsi_padding(count);
2155         struct page *pg;
2156         int err;
2157
2158         if (!tcp_task || (tcp_task->dd_data != tdata)) {
2159                 pr_err("task 0x%p,0x%p, tcp_task 0x%p, tdata 0x%p/0x%p.\n",
2160                        task, task->sc, tcp_task,
2161                        tcp_task ? tcp_task->dd_data : NULL, tdata);
2162                 return -EINVAL;
2163         }
2164         skb = tdata->skb;
2165
2166         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2167                   "task 0x%p,0x%p, skb 0x%p, 0x%x,0x%x,0x%x, %u+%u.\n",
2168                   task, task->sc, skb, (*skb->data) & ISCSI_OPCODE_MASK,
2169                   be32_to_cpu(task->cmdsn), be32_to_cpu(task->hdr->itt), offset, count);
2170
2171         skb_put(skb, task->hdr_len);
2172         tx_skb_setmode(skb, conn->hdrdgst_en, datalen ? conn->datadgst_en : 0);
2173         if (!count) {
2174                 tdata->count = count;
2175                 tdata->offset = offset;
2176                 tdata->nr_frags = 0;
2177                 tdata->total_offset = 0;
2178                 tdata->total_count = 0;
2179                 if (tdata->max_xmit_dlength)
2180                         conn->max_xmit_dlength = tdata->max_xmit_dlength;
2181                 cxgbi_skcb_clear_flag(skb, SKCBF_TX_ISO);
2182                 return 0;
2183         }
2184
2185         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2186                   "data->total_count %u, tdata->total_offset %u\n",
2187                   tdata->total_count, tdata->total_offset);
2188
2189         expected_count = tdata->total_count;
2190         expected_offset = tdata->total_offset;
2191
2192         if ((count != expected_count) ||
2193             (offset != expected_offset)) {
2194                 err = cxgbi_task_data_sgl_read(task, offset, count, &dlimit);
2195                 if (err < 0) {
2196                         pr_err("task 0x%p,0x%p, tcp_task 0x%p, tdata 0x%p/0x%p "
2197                                "dlimit %u, sgl err %d.\n", task, task->sc,
2198                                tcp_task, tcp_task ? tcp_task->dd_data : NULL,
2199                                tdata, dlimit, err);
2200                         return err;
2201                 }
2202         }
2203
2204         /* Restore original value of conn->max_xmit_dlength because
2205          * it can get updated to ISO data size.
2206          */
2207         conn->max_xmit_dlength = tdata->max_xmit_dlength;
2208
2209         if (sc) {
2210                 struct page_frag *frag = tdata->frags;
2211
2212                 if ((tdata->flags & CXGBI_TASK_SGL_COPY) ||
2213                     (tdata->nr_frags > MAX_SKB_FRAGS) ||
2214                     (padlen && (tdata->nr_frags ==
2215                                         MAX_SKB_FRAGS))) {
2216                         char *dst = skb->data + task->hdr_len;
2217
2218                         /* data fits in the skb's headroom */
2219                         for (i = 0; i < tdata->nr_frags; i++, frag++) {
2220                                 char *src = kmap_atomic(frag->page);
2221
2222                                 memcpy(dst, src + frag->offset, frag->size);
2223                                 dst += frag->size;
2224                                 kunmap_atomic(src);
2225                         }
2226
2227                         if (padlen) {
2228                                 memset(dst, 0, padlen);
2229                                 padlen = 0;
2230                         }
2231                         skb_put(skb, count + padlen);
2232                 } else {
2233                         for (i = 0; i < tdata->nr_frags; i++, frag++) {
2234                                 get_page(frag->page);
2235                                 skb_fill_page_desc(skb, i, frag->page,
2236                                                    frag->offset, frag->size);
2237                         }
2238
2239                         skb->len += count;
2240                         skb->data_len += count;
2241                         skb->truesize += count;
2242                 }
2243         } else {
2244                 pg = virt_to_head_page(task->data);
2245                 get_page(pg);
2246                 skb_fill_page_desc(skb, 0, pg,
2247                                    task->data - (char *)page_address(pg),
2248                                    count);
2249                 skb->len += count;
2250                 skb->data_len += count;
2251                 skb->truesize += count;
2252         }
2253
2254         if (padlen) {
2255                 get_page(rsvd_page);
2256                 skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags,
2257                                    rsvd_page, 0, padlen);
2258
2259                 skb->data_len += padlen;
2260                 skb->truesize += padlen;
2261                 skb->len += padlen;
2262         }
2263
2264         if (likely(count > tdata->max_xmit_dlength))
2265                 cxgbi_prep_iso_info(task, skb, count);
2266         else
2267                 cxgbi_skcb_clear_flag(skb, SKCBF_TX_ISO);
2268
2269         return 0;
2270 }
2271 EXPORT_SYMBOL_GPL(cxgbi_conn_init_pdu);
2272
2273 static int cxgbi_sock_tx_queue_up(struct cxgbi_sock *csk, struct sk_buff *skb)
2274 {
2275         struct cxgbi_device *cdev = csk->cdev;
2276         struct cxgbi_iso_info *iso_cpl;
2277         u32 frags = skb_shinfo(skb)->nr_frags;
2278         u32 extra_len, num_pdu, hdr_len;
2279         u32 iso_tx_rsvd = 0;
2280
2281         if (csk->state != CTP_ESTABLISHED) {
2282                 log_debug(1 << CXGBI_DBG_PDU_TX,
2283                           "csk 0x%p,%u,0x%lx,%u, EAGAIN.\n",
2284                           csk, csk->state, csk->flags, csk->tid);
2285                 return -EPIPE;
2286         }
2287
2288         if (csk->err) {
2289                 log_debug(1 << CXGBI_DBG_PDU_TX,
2290                           "csk 0x%p,%u,0x%lx,%u, EPIPE %d.\n",
2291                           csk, csk->state, csk->flags, csk->tid, csk->err);
2292                 return -EPIPE;
2293         }
2294
2295         if ((cdev->flags & CXGBI_FLAG_DEV_T3) &&
2296             before((csk->snd_win + csk->snd_una), csk->write_seq)) {
2297                 log_debug(1 << CXGBI_DBG_PDU_TX,
2298                           "csk 0x%p,%u,0x%lx,%u, FULL %u-%u >= %u.\n",
2299                           csk, csk->state, csk->flags, csk->tid, csk->write_seq,
2300                           csk->snd_una, csk->snd_win);
2301                 return -ENOBUFS;
2302         }
2303
2304         if (cxgbi_skcb_test_flag(skb, SKCBF_TX_ISO))
2305                 iso_tx_rsvd = cdev->skb_iso_txhdr;
2306
2307         if (unlikely(skb_headroom(skb) < (cdev->skb_tx_rsvd + iso_tx_rsvd))) {
2308                 pr_err("csk 0x%p, skb head %u < %u.\n",
2309                        csk, skb_headroom(skb), cdev->skb_tx_rsvd);
2310                 return -EINVAL;
2311         }
2312
2313         if (skb->len != skb->data_len)
2314                 frags++;
2315
2316         if (frags >= SKB_WR_LIST_SIZE) {
2317                 pr_err("csk 0x%p, frags %u, %u,%u >%lu.\n",
2318                        csk, skb_shinfo(skb)->nr_frags, skb->len,
2319                        skb->data_len, SKB_WR_LIST_SIZE);
2320                 return -EINVAL;
2321         }
2322
2323         cxgbi_skcb_set_flag(skb, SKCBF_TX_NEED_HDR);
2324         skb_reset_transport_header(skb);
2325         cxgbi_sock_skb_entail(csk, skb);
2326
2327         extra_len = cxgbi_ulp_extra_len(cxgbi_skcb_tx_ulp_mode(skb));
2328
2329         if (likely(cxgbi_skcb_test_flag(skb, SKCBF_TX_ISO))) {
2330                 iso_cpl = (struct cxgbi_iso_info *)skb->head;
2331                 num_pdu = iso_cpl->num_pdu;
2332                 hdr_len = cxgbi_skcb_tx_iscsi_hdrlen(skb);
2333                 extra_len = (cxgbi_ulp_extra_len(cxgbi_skcb_tx_ulp_mode(skb)) *
2334                              num_pdu) + (hdr_len * (num_pdu - 1));
2335         }
2336
2337         csk->write_seq += (skb->len + extra_len);
2338
2339         return 0;
2340 }
2341
2342 static int cxgbi_sock_send_skb(struct cxgbi_sock *csk, struct sk_buff *skb)
2343 {
2344         struct cxgbi_device *cdev = csk->cdev;
2345         int len = skb->len;
2346         int err;
2347
2348         spin_lock_bh(&csk->lock);
2349         err = cxgbi_sock_tx_queue_up(csk, skb);
2350         if (err < 0) {
2351                 spin_unlock_bh(&csk->lock);
2352                 return err;
2353         }
2354
2355         if (likely(skb_queue_len(&csk->write_queue)))
2356                 cdev->csk_push_tx_frames(csk, 0);
2357         spin_unlock_bh(&csk->lock);
2358         return len;
2359 }
2360
2361 int cxgbi_conn_xmit_pdu(struct iscsi_task *task)
2362 {
2363         struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
2364         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2365         struct iscsi_tcp_task *tcp_task = task->dd_data;
2366         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2367         struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
2368         struct sk_buff *skb;
2369         struct cxgbi_sock *csk = NULL;
2370         u32 pdulen = 0;
2371         u32 datalen;
2372         int err;
2373
2374         if (!tcp_task || (tcp_task->dd_data != tdata)) {
2375                 pr_err("task 0x%p,0x%p, tcp_task 0x%p, tdata 0x%p/0x%p.\n",
2376                        task, task->sc, tcp_task,
2377                        tcp_task ? tcp_task->dd_data : NULL, tdata);
2378                 return -EINVAL;
2379         }
2380
2381         skb = tdata->skb;
2382         if (!skb) {
2383                 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2384                           "task 0x%p, skb NULL.\n", task);
2385                 return 0;
2386         }
2387
2388         if (cconn && cconn->cep)
2389                 csk = cconn->cep->csk;
2390
2391         if (!csk) {
2392                 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2393                           "task 0x%p, csk gone.\n", task);
2394                 return -EPIPE;
2395         }
2396
2397         tdata->skb = NULL;
2398         datalen = skb->data_len;
2399
2400         /* write ppod first if using ofldq to write ppod */
2401         if (ttinfo->flags & CXGBI_PPOD_INFO_FLAG_VALID) {
2402                 struct cxgbi_ppm *ppm = csk->cdev->cdev2ppm(csk->cdev);
2403
2404                 ttinfo->flags &= ~CXGBI_PPOD_INFO_FLAG_VALID;
2405                 if (csk->cdev->csk_ddp_set_map(ppm, csk, ttinfo) < 0)
2406                         pr_err("task 0x%p, ppod writing using ofldq failed.\n",
2407                                task);
2408                         /* continue. Let fl get the data */
2409         }
2410
2411         if (!task->sc)
2412                 memcpy(skb->data, task->hdr, SKB_TX_ISCSI_PDU_HEADER_MAX);
2413
2414         err = cxgbi_sock_send_skb(csk, skb);
2415         if (err > 0) {
2416                 pdulen += err;
2417
2418                 log_debug(1 << CXGBI_DBG_PDU_TX, "task 0x%p,0x%p, rv %d.\n",
2419                           task, task->sc, err);
2420
2421                 if (task->conn->hdrdgst_en)
2422                         pdulen += ISCSI_DIGEST_SIZE;
2423
2424                 if (datalen && task->conn->datadgst_en)
2425                         pdulen += ISCSI_DIGEST_SIZE;
2426
2427                 task->conn->txdata_octets += pdulen;
2428
2429                 if (unlikely(cxgbi_is_iso_config(csk) && cxgbi_is_iso_disabled(csk))) {
2430                         if (time_after(jiffies, csk->prev_iso_ts + HZ)) {
2431                                 csk->disable_iso = false;
2432                                 csk->prev_iso_ts = 0;
2433                                 log_debug(1 << CXGBI_DBG_PDU_TX,
2434                                           "enable iso: csk 0x%p\n", csk);
2435                         }
2436                 }
2437
2438                 return 0;
2439         }
2440
2441         if (err == -EAGAIN || err == -ENOBUFS) {
2442                 log_debug(1 << CXGBI_DBG_PDU_TX,
2443                           "task 0x%p, skb 0x%p, len %u/%u, %d EAGAIN.\n",
2444                           task, skb, skb->len, skb->data_len, err);
2445                 /* reset skb to send when we are called again */
2446                 tdata->skb = skb;
2447
2448                 if (cxgbi_is_iso_config(csk) && !cxgbi_is_iso_disabled(csk) &&
2449                     (csk->no_tx_credits++ >= 2)) {
2450                         csk->disable_iso = true;
2451                         csk->prev_iso_ts = jiffies;
2452                         log_debug(1 << CXGBI_DBG_PDU_TX,
2453                                   "disable iso:csk 0x%p, ts:%lu\n",
2454                                   csk, csk->prev_iso_ts);
2455                 }
2456
2457                 return err;
2458         }
2459
2460         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2461                   "itt 0x%x, skb 0x%p, len %u/%u, xmit err %d.\n",
2462                   task->itt, skb, skb->len, skb->data_len, err);
2463         __kfree_skb(skb);
2464         iscsi_conn_printk(KERN_ERR, task->conn, "xmit err %d.\n", err);
2465         iscsi_conn_failure(task->conn, ISCSI_ERR_XMIT_FAILED);
2466         return err;
2467 }
2468 EXPORT_SYMBOL_GPL(cxgbi_conn_xmit_pdu);
2469
2470 void cxgbi_cleanup_task(struct iscsi_task *task)
2471 {
2472         struct iscsi_tcp_task *tcp_task = task->dd_data;
2473         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2474
2475         if (!tcp_task || (tcp_task->dd_data != tdata)) {
2476                 pr_info("task 0x%p,0x%p, tcp_task 0x%p, tdata 0x%p/0x%p.\n",
2477                         task, task->sc, tcp_task,
2478                         tcp_task ? tcp_task->dd_data : NULL, tdata);
2479                 return;
2480         }
2481
2482         log_debug(1 << CXGBI_DBG_ISCSI,
2483                 "task 0x%p, skb 0x%p, itt 0x%x.\n",
2484                 task, tdata->skb, task->hdr_itt);
2485
2486         tcp_task->dd_data = NULL;
2487
2488         if (!task->sc)
2489                 kfree(task->hdr);
2490         task->hdr = NULL;
2491
2492         /*  never reached the xmit task callout */
2493         if (tdata->skb) {
2494                 __kfree_skb(tdata->skb);
2495                 tdata->skb = NULL;
2496         }
2497
2498         task_release_itt(task, task->hdr_itt);
2499         memset(tdata, 0, sizeof(*tdata));
2500
2501         iscsi_tcp_cleanup_task(task);
2502 }
2503 EXPORT_SYMBOL_GPL(cxgbi_cleanup_task);
2504
2505 void cxgbi_get_conn_stats(struct iscsi_cls_conn *cls_conn,
2506                                 struct iscsi_stats *stats)
2507 {
2508         struct iscsi_conn *conn = cls_conn->dd_data;
2509
2510         stats->txdata_octets = conn->txdata_octets;
2511         stats->rxdata_octets = conn->rxdata_octets;
2512         stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
2513         stats->dataout_pdus = conn->dataout_pdus_cnt;
2514         stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
2515         stats->datain_pdus = conn->datain_pdus_cnt;
2516         stats->r2t_pdus = conn->r2t_pdus_cnt;
2517         stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
2518         stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
2519         stats->digest_err = 0;
2520         stats->timeout_err = 0;
2521         stats->custom_length = 1;
2522         strcpy(stats->custom[0].desc, "eh_abort_cnt");
2523         stats->custom[0].value = conn->eh_abort_cnt;
2524 }
2525 EXPORT_SYMBOL_GPL(cxgbi_get_conn_stats);
2526
2527 static int cxgbi_conn_max_xmit_dlength(struct iscsi_conn *conn)
2528 {
2529         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2530         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2531         struct cxgbi_device *cdev = cconn->chba->cdev;
2532         unsigned int headroom = SKB_MAX_HEAD(cdev->skb_tx_rsvd);
2533         unsigned int max_def = 512 * MAX_SKB_FRAGS;
2534         unsigned int max = max(max_def, headroom);
2535
2536         max = min(cconn->chba->cdev->tx_max_size, max);
2537         if (conn->max_xmit_dlength)
2538                 conn->max_xmit_dlength = min(conn->max_xmit_dlength, max);
2539         else
2540                 conn->max_xmit_dlength = max;
2541         cxgbi_align_pdu_size(conn->max_xmit_dlength);
2542
2543         return 0;
2544 }
2545
2546 static int cxgbi_conn_max_recv_dlength(struct iscsi_conn *conn)
2547 {
2548         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2549         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2550         unsigned int max = cconn->chba->cdev->rx_max_size;
2551
2552         cxgbi_align_pdu_size(max);
2553
2554         if (conn->max_recv_dlength) {
2555                 if (conn->max_recv_dlength > max) {
2556                         pr_err("MaxRecvDataSegmentLength %u > %u.\n",
2557                                 conn->max_recv_dlength, max);
2558                         return -EINVAL;
2559                 }
2560                 conn->max_recv_dlength = min(conn->max_recv_dlength, max);
2561                 cxgbi_align_pdu_size(conn->max_recv_dlength);
2562         } else
2563                 conn->max_recv_dlength = max;
2564
2565         return 0;
2566 }
2567
2568 int cxgbi_set_conn_param(struct iscsi_cls_conn *cls_conn,
2569                         enum iscsi_param param, char *buf, int buflen)
2570 {
2571         struct iscsi_conn *conn = cls_conn->dd_data;
2572         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2573         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2574         struct cxgbi_sock *csk = cconn->cep->csk;
2575         int err;
2576
2577         log_debug(1 << CXGBI_DBG_ISCSI,
2578                 "cls_conn 0x%p, param %d, buf(%d) %s.\n",
2579                 cls_conn, param, buflen, buf);
2580
2581         switch (param) {
2582         case ISCSI_PARAM_HDRDGST_EN:
2583                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2584                 if (!err && conn->hdrdgst_en)
2585                         err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2586                                                         conn->hdrdgst_en,
2587                                                         conn->datadgst_en);
2588                 break;
2589         case ISCSI_PARAM_DATADGST_EN:
2590                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2591                 if (!err && conn->datadgst_en)
2592                         err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2593                                                         conn->hdrdgst_en,
2594                                                         conn->datadgst_en);
2595                 break;
2596         case ISCSI_PARAM_MAX_R2T:
2597                 return iscsi_tcp_set_max_r2t(conn, buf);
2598         case ISCSI_PARAM_MAX_RECV_DLENGTH:
2599                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2600                 if (!err)
2601                         err = cxgbi_conn_max_recv_dlength(conn);
2602                 break;
2603         case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2604                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2605                 if (!err)
2606                         err = cxgbi_conn_max_xmit_dlength(conn);
2607                 break;
2608         default:
2609                 return iscsi_set_param(cls_conn, param, buf, buflen);
2610         }
2611         return err;
2612 }
2613 EXPORT_SYMBOL_GPL(cxgbi_set_conn_param);
2614
2615 int cxgbi_get_ep_param(struct iscsi_endpoint *ep, enum iscsi_param param,
2616                        char *buf)
2617 {
2618         struct cxgbi_endpoint *cep = ep->dd_data;
2619         struct cxgbi_sock *csk;
2620
2621         log_debug(1 << CXGBI_DBG_ISCSI,
2622                 "cls_conn 0x%p, param %d.\n", ep, param);
2623
2624         switch (param) {
2625         case ISCSI_PARAM_CONN_PORT:
2626         case ISCSI_PARAM_CONN_ADDRESS:
2627                 if (!cep)
2628                         return -ENOTCONN;
2629
2630                 csk = cep->csk;
2631                 if (!csk)
2632                         return -ENOTCONN;
2633
2634                 return iscsi_conn_get_addr_param((struct sockaddr_storage *)
2635                                                  &csk->daddr, param, buf);
2636         default:
2637                 break;
2638         }
2639         return -ENOSYS;
2640 }
2641 EXPORT_SYMBOL_GPL(cxgbi_get_ep_param);
2642
2643 struct iscsi_cls_conn *
2644 cxgbi_create_conn(struct iscsi_cls_session *cls_session, u32 cid)
2645 {
2646         struct iscsi_cls_conn *cls_conn;
2647         struct iscsi_conn *conn;
2648         struct iscsi_tcp_conn *tcp_conn;
2649         struct cxgbi_conn *cconn;
2650
2651         cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*cconn), cid);
2652         if (!cls_conn)
2653                 return NULL;
2654
2655         conn = cls_conn->dd_data;
2656         tcp_conn = conn->dd_data;
2657         cconn = tcp_conn->dd_data;
2658         cconn->iconn = conn;
2659
2660         log_debug(1 << CXGBI_DBG_ISCSI,
2661                 "cid %u(0x%x), cls 0x%p,0x%p, conn 0x%p,0x%p,0x%p.\n",
2662                 cid, cid, cls_session, cls_conn, conn, tcp_conn, cconn);
2663
2664         return cls_conn;
2665 }
2666 EXPORT_SYMBOL_GPL(cxgbi_create_conn);
2667
2668 int cxgbi_bind_conn(struct iscsi_cls_session *cls_session,
2669                                 struct iscsi_cls_conn *cls_conn,
2670                                 u64 transport_eph, int is_leading)
2671 {
2672         struct iscsi_conn *conn = cls_conn->dd_data;
2673         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2674         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2675         struct cxgbi_ppm *ppm;
2676         struct iscsi_endpoint *ep;
2677         struct cxgbi_endpoint *cep;
2678         struct cxgbi_sock *csk;
2679         int err;
2680
2681         ep = iscsi_lookup_endpoint(transport_eph);
2682         if (!ep)
2683                 return -EINVAL;
2684
2685         /*  setup ddp pagesize */
2686         cep = ep->dd_data;
2687         csk = cep->csk;
2688
2689         ppm = csk->cdev->cdev2ppm(csk->cdev);
2690         err = csk->cdev->csk_ddp_setup_pgidx(csk, csk->tid,
2691                                              ppm->tformat.pgsz_idx_dflt);
2692         if (err < 0)
2693                 goto put_ep;
2694
2695         err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
2696         if (err) {
2697                 err = -EINVAL;
2698                 goto put_ep;
2699         }
2700
2701         /*  calculate the tag idx bits needed for this conn based on cmds_max */
2702         cconn->task_idx_bits = (__ilog2_u32(conn->session->cmds_max - 1)) + 1;
2703
2704         write_lock_bh(&csk->callback_lock);
2705         csk->user_data = conn;
2706         cconn->chba = cep->chba;
2707         cconn->cep = cep;
2708         cep->cconn = cconn;
2709         write_unlock_bh(&csk->callback_lock);
2710
2711         cxgbi_conn_max_xmit_dlength(conn);
2712         cxgbi_conn_max_recv_dlength(conn);
2713
2714         log_debug(1 << CXGBI_DBG_ISCSI,
2715                 "cls 0x%p,0x%p, ep 0x%p, cconn 0x%p, csk 0x%p.\n",
2716                 cls_session, cls_conn, ep, cconn, csk);
2717         /*  init recv engine */
2718         iscsi_tcp_hdr_recv_prep(tcp_conn);
2719
2720 put_ep:
2721         iscsi_put_endpoint(ep);
2722         return err;
2723 }
2724 EXPORT_SYMBOL_GPL(cxgbi_bind_conn);
2725
2726 struct iscsi_cls_session *cxgbi_create_session(struct iscsi_endpoint *ep,
2727                                                 u16 cmds_max, u16 qdepth,
2728                                                 u32 initial_cmdsn)
2729 {
2730         struct cxgbi_endpoint *cep;
2731         struct cxgbi_hba *chba;
2732         struct Scsi_Host *shost;
2733         struct iscsi_cls_session *cls_session;
2734         struct iscsi_session *session;
2735
2736         if (!ep) {
2737                 pr_err("missing endpoint.\n");
2738                 return NULL;
2739         }
2740
2741         cep = ep->dd_data;
2742         chba = cep->chba;
2743         shost = chba->shost;
2744
2745         BUG_ON(chba != iscsi_host_priv(shost));
2746
2747         cls_session = iscsi_session_setup(chba->cdev->itp, shost,
2748                                         cmds_max, 0,
2749                                         sizeof(struct iscsi_tcp_task) +
2750                                         sizeof(struct cxgbi_task_data),
2751                                         initial_cmdsn, ISCSI_MAX_TARGET);
2752         if (!cls_session)
2753                 return NULL;
2754
2755         session = cls_session->dd_data;
2756         if (iscsi_tcp_r2tpool_alloc(session))
2757                 goto remove_session;
2758
2759         log_debug(1 << CXGBI_DBG_ISCSI,
2760                 "ep 0x%p, cls sess 0x%p.\n", ep, cls_session);
2761         return cls_session;
2762
2763 remove_session:
2764         iscsi_session_teardown(cls_session);
2765         return NULL;
2766 }
2767 EXPORT_SYMBOL_GPL(cxgbi_create_session);
2768
2769 void cxgbi_destroy_session(struct iscsi_cls_session *cls_session)
2770 {
2771         log_debug(1 << CXGBI_DBG_ISCSI,
2772                 "cls sess 0x%p.\n", cls_session);
2773
2774         iscsi_tcp_r2tpool_free(cls_session->dd_data);
2775         iscsi_session_teardown(cls_session);
2776 }
2777 EXPORT_SYMBOL_GPL(cxgbi_destroy_session);
2778
2779 int cxgbi_set_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2780                         char *buf, int buflen)
2781 {
2782         struct cxgbi_hba *chba = iscsi_host_priv(shost);
2783
2784         if (!chba->ndev) {
2785                 shost_printk(KERN_ERR, shost, "Could not get host param. "
2786                                 "netdev for host not set.\n");
2787                 return -ENODEV;
2788         }
2789
2790         log_debug(1 << CXGBI_DBG_ISCSI,
2791                 "shost 0x%p, hba 0x%p,%s, param %d, buf(%d) %s.\n",
2792                 shost, chba, chba->ndev->name, param, buflen, buf);
2793
2794         switch (param) {
2795         case ISCSI_HOST_PARAM_IPADDRESS:
2796         {
2797                 __be32 addr = in_aton(buf);
2798                 log_debug(1 << CXGBI_DBG_ISCSI,
2799                         "hba %s, req. ipv4 %pI4.\n", chba->ndev->name, &addr);
2800                 cxgbi_set_iscsi_ipv4(chba, addr);
2801                 return 0;
2802         }
2803         case ISCSI_HOST_PARAM_HWADDRESS:
2804         case ISCSI_HOST_PARAM_NETDEV_NAME:
2805                 return 0;
2806         default:
2807                 return iscsi_host_set_param(shost, param, buf, buflen);
2808         }
2809 }
2810 EXPORT_SYMBOL_GPL(cxgbi_set_host_param);
2811
2812 int cxgbi_get_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2813                         char *buf)
2814 {
2815         struct cxgbi_hba *chba = iscsi_host_priv(shost);
2816         int len = 0;
2817
2818         if (!chba->ndev) {
2819                 shost_printk(KERN_ERR, shost, "Could not get host param. "
2820                                 "netdev for host not set.\n");
2821                 return -ENODEV;
2822         }
2823
2824         log_debug(1 << CXGBI_DBG_ISCSI,
2825                 "shost 0x%p, hba 0x%p,%s, param %d.\n",
2826                 shost, chba, chba->ndev->name, param);
2827
2828         switch (param) {
2829         case ISCSI_HOST_PARAM_HWADDRESS:
2830                 len = sysfs_format_mac(buf, chba->ndev->dev_addr, 6);
2831                 break;
2832         case ISCSI_HOST_PARAM_NETDEV_NAME:
2833                 len = sprintf(buf, "%s\n", chba->ndev->name);
2834                 break;
2835         case ISCSI_HOST_PARAM_IPADDRESS:
2836         {
2837                 struct cxgbi_sock *csk = find_sock_on_port(chba->cdev,
2838                                                            chba->port_id);
2839                 if (csk) {
2840                         len = sprintf(buf, "%pIS",
2841                                       (struct sockaddr *)&csk->saddr);
2842                 }
2843                 log_debug(1 << CXGBI_DBG_ISCSI,
2844                           "hba %s, addr %s.\n", chba->ndev->name, buf);
2845                 break;
2846         }
2847         default:
2848                 return iscsi_host_get_param(shost, param, buf);
2849         }
2850
2851         return len;
2852 }
2853 EXPORT_SYMBOL_GPL(cxgbi_get_host_param);
2854
2855 struct iscsi_endpoint *cxgbi_ep_connect(struct Scsi_Host *shost,
2856                                         struct sockaddr *dst_addr,
2857                                         int non_blocking)
2858 {
2859         struct iscsi_endpoint *ep;
2860         struct cxgbi_endpoint *cep;
2861         struct cxgbi_hba *hba = NULL;
2862         struct cxgbi_sock *csk;
2863         int ifindex = 0;
2864         int err = -EINVAL;
2865
2866         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2867                 "shost 0x%p, non_blocking %d, dst_addr 0x%p.\n",
2868                 shost, non_blocking, dst_addr);
2869
2870         if (shost) {
2871                 hba = iscsi_host_priv(shost);
2872                 if (!hba) {
2873                         pr_info("shost 0x%p, priv NULL.\n", shost);
2874                         goto err_out;
2875                 }
2876         }
2877
2878 check_route:
2879         if (dst_addr->sa_family == AF_INET) {
2880                 csk = cxgbi_check_route(dst_addr, ifindex);
2881 #if IS_ENABLED(CONFIG_IPV6)
2882         } else if (dst_addr->sa_family == AF_INET6) {
2883                 csk = cxgbi_check_route6(dst_addr, ifindex);
2884 #endif
2885         } else {
2886                 pr_info("address family 0x%x NOT supported.\n",
2887                         dst_addr->sa_family);
2888                 err = -EAFNOSUPPORT;
2889                 return (struct iscsi_endpoint *)ERR_PTR(err);
2890         }
2891
2892         if (IS_ERR(csk))
2893                 return (struct iscsi_endpoint *)csk;
2894         cxgbi_sock_get(csk);
2895
2896         if (!hba)
2897                 hba = csk->cdev->hbas[csk->port_id];
2898         else if (hba != csk->cdev->hbas[csk->port_id]) {
2899                 if (ifindex != hba->ndev->ifindex) {
2900                         cxgbi_sock_put(csk);
2901                         cxgbi_sock_closed(csk);
2902                         ifindex = hba->ndev->ifindex;
2903                         goto check_route;
2904                 }
2905
2906                 pr_info("Could not connect through requested host %u"
2907                         "hba 0x%p != 0x%p (%u).\n",
2908                         shost->host_no, hba,
2909                         csk->cdev->hbas[csk->port_id], csk->port_id);
2910                 err = -ENOSPC;
2911                 goto release_conn;
2912         }
2913
2914         err = sock_get_port(csk);
2915         if (err)
2916                 goto release_conn;
2917
2918         cxgbi_sock_set_state(csk, CTP_CONNECTING);
2919         err = csk->cdev->csk_init_act_open(csk);
2920         if (err)
2921                 goto release_conn;
2922
2923         if (cxgbi_sock_is_closing(csk)) {
2924                 err = -ENOSPC;
2925                 pr_info("csk 0x%p is closing.\n", csk);
2926                 goto release_conn;
2927         }
2928
2929         ep = iscsi_create_endpoint(sizeof(*cep));
2930         if (!ep) {
2931                 err = -ENOMEM;
2932                 pr_info("iscsi alloc ep, OOM.\n");
2933                 goto release_conn;
2934         }
2935
2936         cep = ep->dd_data;
2937         cep->csk = csk;
2938         cep->chba = hba;
2939
2940         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2941                 "ep 0x%p, cep 0x%p, csk 0x%p, hba 0x%p,%s.\n",
2942                 ep, cep, csk, hba, hba->ndev->name);
2943         return ep;
2944
2945 release_conn:
2946         cxgbi_sock_put(csk);
2947         cxgbi_sock_closed(csk);
2948 err_out:
2949         return ERR_PTR(err);
2950 }
2951 EXPORT_SYMBOL_GPL(cxgbi_ep_connect);
2952
2953 int cxgbi_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
2954 {
2955         struct cxgbi_endpoint *cep = ep->dd_data;
2956         struct cxgbi_sock *csk = cep->csk;
2957
2958         if (!cxgbi_sock_is_established(csk))
2959                 return 0;
2960         return 1;
2961 }
2962 EXPORT_SYMBOL_GPL(cxgbi_ep_poll);
2963
2964 void cxgbi_ep_disconnect(struct iscsi_endpoint *ep)
2965 {
2966         struct cxgbi_endpoint *cep = ep->dd_data;
2967         struct cxgbi_conn *cconn = cep->cconn;
2968         struct cxgbi_sock *csk = cep->csk;
2969
2970         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2971                 "ep 0x%p, cep 0x%p, cconn 0x%p, csk 0x%p,%u,0x%lx.\n",
2972                 ep, cep, cconn, csk, csk->state, csk->flags);
2973
2974         if (cconn && cconn->iconn) {
2975                 write_lock_bh(&csk->callback_lock);
2976                 cep->csk->user_data = NULL;
2977                 cconn->cep = NULL;
2978                 write_unlock_bh(&csk->callback_lock);
2979         }
2980         iscsi_destroy_endpoint(ep);
2981
2982         if (likely(csk->state >= CTP_ESTABLISHED))
2983                 need_active_close(csk);
2984         else
2985                 cxgbi_sock_closed(csk);
2986
2987         cxgbi_sock_put(csk);
2988 }
2989 EXPORT_SYMBOL_GPL(cxgbi_ep_disconnect);
2990
2991 int cxgbi_iscsi_init(struct iscsi_transport *itp,
2992                         struct scsi_transport_template **stt)
2993 {
2994         *stt = iscsi_register_transport(itp);
2995         if (*stt == NULL) {
2996                 pr_err("unable to register %s transport 0x%p.\n",
2997                         itp->name, itp);
2998                 return -ENODEV;
2999         }
3000         log_debug(1 << CXGBI_DBG_ISCSI,
3001                 "%s, registered iscsi transport 0x%p.\n",
3002                 itp->name, stt);
3003         return 0;
3004 }
3005 EXPORT_SYMBOL_GPL(cxgbi_iscsi_init);
3006
3007 void cxgbi_iscsi_cleanup(struct iscsi_transport *itp,
3008                         struct scsi_transport_template **stt)
3009 {
3010         if (*stt) {
3011                 log_debug(1 << CXGBI_DBG_ISCSI,
3012                         "de-register transport 0x%p, %s, stt 0x%p.\n",
3013                         itp, itp->name, *stt);
3014                 *stt = NULL;
3015                 iscsi_unregister_transport(itp);
3016         }
3017 }
3018 EXPORT_SYMBOL_GPL(cxgbi_iscsi_cleanup);
3019
3020 umode_t cxgbi_attr_is_visible(int param_type, int param)
3021 {
3022         switch (param_type) {
3023         case ISCSI_HOST_PARAM:
3024                 switch (param) {
3025                 case ISCSI_HOST_PARAM_NETDEV_NAME:
3026                 case ISCSI_HOST_PARAM_HWADDRESS:
3027                 case ISCSI_HOST_PARAM_IPADDRESS:
3028                 case ISCSI_HOST_PARAM_INITIATOR_NAME:
3029                         return S_IRUGO;
3030                 default:
3031                         return 0;
3032                 }
3033         case ISCSI_PARAM:
3034                 switch (param) {
3035                 case ISCSI_PARAM_MAX_RECV_DLENGTH:
3036                 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
3037                 case ISCSI_PARAM_HDRDGST_EN:
3038                 case ISCSI_PARAM_DATADGST_EN:
3039                 case ISCSI_PARAM_CONN_ADDRESS:
3040                 case ISCSI_PARAM_CONN_PORT:
3041                 case ISCSI_PARAM_EXP_STATSN:
3042                 case ISCSI_PARAM_PERSISTENT_ADDRESS:
3043                 case ISCSI_PARAM_PERSISTENT_PORT:
3044                 case ISCSI_PARAM_PING_TMO:
3045                 case ISCSI_PARAM_RECV_TMO:
3046                 case ISCSI_PARAM_INITIAL_R2T_EN:
3047                 case ISCSI_PARAM_MAX_R2T:
3048                 case ISCSI_PARAM_IMM_DATA_EN:
3049                 case ISCSI_PARAM_FIRST_BURST:
3050                 case ISCSI_PARAM_MAX_BURST:
3051                 case ISCSI_PARAM_PDU_INORDER_EN:
3052                 case ISCSI_PARAM_DATASEQ_INORDER_EN:
3053                 case ISCSI_PARAM_ERL:
3054                 case ISCSI_PARAM_TARGET_NAME:
3055                 case ISCSI_PARAM_TPGT:
3056                 case ISCSI_PARAM_USERNAME:
3057                 case ISCSI_PARAM_PASSWORD:
3058                 case ISCSI_PARAM_USERNAME_IN:
3059                 case ISCSI_PARAM_PASSWORD_IN:
3060                 case ISCSI_PARAM_FAST_ABORT:
3061                 case ISCSI_PARAM_ABORT_TMO:
3062                 case ISCSI_PARAM_LU_RESET_TMO:
3063                 case ISCSI_PARAM_TGT_RESET_TMO:
3064                 case ISCSI_PARAM_IFACE_NAME:
3065                 case ISCSI_PARAM_INITIATOR_NAME:
3066                         return S_IRUGO;
3067                 default:
3068                         return 0;
3069                 }
3070         }
3071
3072         return 0;
3073 }
3074 EXPORT_SYMBOL_GPL(cxgbi_attr_is_visible);
3075
3076 static int __init libcxgbi_init_module(void)
3077 {
3078         pr_info("%s", version);
3079
3080         BUILD_BUG_ON(sizeof_field(struct sk_buff, cb) <
3081                      sizeof(struct cxgbi_skb_cb));
3082         rsvd_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
3083         if (!rsvd_page)
3084                 return -ENOMEM;
3085
3086         return 0;
3087 }
3088
3089 static void __exit libcxgbi_exit_module(void)
3090 {
3091         cxgbi_device_unregister_all(0xFF);
3092         put_page(rsvd_page);
3093         return;
3094 }
3095
3096 module_init(libcxgbi_init_module);
3097 module_exit(libcxgbi_exit_module);