drivers/scsi/bnx2fc/bnx2fc_io.c

   1 /* bnx2fc_io.c: Broadcom NetXtreme II Linux FCoE offload driver.
   2  * IO manager and SCSI IO processing.
   3  *
   4  * Copyright (c) 2008 - 2013 Broadcom Corporation
   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: Bhanu Prakash Gollapudi (bprakash@broadcom.com)
  11  */
  12
  13 #include "bnx2fc.h"
  14
  15 #define RESERVE_FREE_LIST_INDEX num_possible_cpus()
  16
  17 static int bnx2fc_split_bd(struct bnx2fc_cmd *io_req, u64 addr, int sg_len,
  18                            int bd_index);
  19 static int bnx2fc_map_sg(struct bnx2fc_cmd *io_req);
  20 static int bnx2fc_build_bd_list_from_sg(struct bnx2fc_cmd *io_req);
  21 static void bnx2fc_unmap_sg_list(struct bnx2fc_cmd *io_req);
  22 static void bnx2fc_free_mp_resc(struct bnx2fc_cmd *io_req);
  23 static void bnx2fc_parse_fcp_rsp(struct bnx2fc_cmd *io_req,
  24                                  struct fcoe_fcp_rsp_payload *fcp_rsp,
  25                                  u8 num_rq);
  26
  27 void bnx2fc_cmd_timer_set(struct bnx2fc_cmd *io_req,
  28                           unsigned int timer_msec)
  29 {
  30         struct bnx2fc_interface *interface = io_req->port->priv;
  31
  32         if (queue_delayed_work(interface->timer_work_queue,
  33                                &io_req->timeout_work,
  34                                msecs_to_jiffies(timer_msec)))
  35                 kref_get(&io_req->refcount);
  36 }
  37
  38 static void bnx2fc_cmd_timeout(struct work_struct *work)
  39 {
  40         struct bnx2fc_cmd *io_req = container_of(work, struct bnx2fc_cmd,
  41                                                  timeout_work.work);
  42         struct fc_lport *lport;
  43         struct fc_rport_priv *rdata;
  44         u8 cmd_type = io_req->cmd_type;
  45         struct bnx2fc_rport *tgt = io_req->tgt;
  46         int logo_issued;
  47         int rc;
  48
  49         BNX2FC_IO_DBG(io_req, "cmd_timeout, cmd_type = %d,"
  50                       "req_flags = %lx\n", cmd_type, io_req->req_flags);
  51
  52         spin_lock_bh(&tgt->tgt_lock);
  53         if (test_and_clear_bit(BNX2FC_FLAG_ISSUE_RRQ, &io_req->req_flags)) {
  54                 clear_bit(BNX2FC_FLAG_RETIRE_OXID, &io_req->req_flags);
  55                 /*
  56                  * ideally we should hold the io_req until RRQ complets,
  57                  * and release io_req from timeout hold.
  58                  */
  59                 spin_unlock_bh(&tgt->tgt_lock);
  60                 bnx2fc_send_rrq(io_req);
  61                 return;
  62         }
  63         if (test_and_clear_bit(BNX2FC_FLAG_RETIRE_OXID, &io_req->req_flags)) {
  64                 BNX2FC_IO_DBG(io_req, "IO ready for reuse now\n");
  65                 goto done;
  66         }
  67
  68         switch (cmd_type) {
  69         case BNX2FC_SCSI_CMD:
  70                 if (test_and_clear_bit(BNX2FC_FLAG_EH_ABORT,
  71                                                         &io_req->req_flags)) {
  72                         /* Handle eh_abort timeout */
  73                         BNX2FC_IO_DBG(io_req, "eh_abort timed out\n");
  74                         complete(&io_req->tm_done);
  75                 } else if (test_bit(BNX2FC_FLAG_ISSUE_ABTS,
  76                                     &io_req->req_flags)) {
  77                         /* Handle internally generated ABTS timeout */
  78                         BNX2FC_IO_DBG(io_req, "ABTS timed out refcnt = %d\n",
  79                                         io_req->refcount.refcount.counter);
  80                         if (!(test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
  81                                                &io_req->req_flags))) {
  82
  83                                 lport = io_req->port->lport;
  84                                 rdata = io_req->tgt->rdata;
  85                                 logo_issued = test_and_set_bit(
  86                                                 BNX2FC_FLAG_EXPL_LOGO,
  87                                                 &tgt->flags);
  88                                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
  89                                 spin_unlock_bh(&tgt->tgt_lock);
  90
  91                                 /* Explicitly logo the target */
  92                                 if (!logo_issued) {
  93                                         BNX2FC_IO_DBG(io_req, "Explicit "
  94                                                    "logo - tgt flags = 0x%lx\n",
  95                                                    tgt->flags);
  96
  97                                         mutex_lock(&lport->disc.disc_mutex);
  98                                         lport->tt.rport_logoff(rdata);
  99                                         mutex_unlock(&lport->disc.disc_mutex);
 100                                 }
 101                                 return;
 102                         }
 103                 } else {
 104                         /* Hanlde IO timeout */
 105                         BNX2FC_IO_DBG(io_req, "IO timed out. issue ABTS\n");
 106                         if (test_and_set_bit(BNX2FC_FLAG_IO_COMPL,
 107                                              &io_req->req_flags)) {
 108                                 BNX2FC_IO_DBG(io_req, "IO completed before "
 109                                                            " timer expiry\n");
 110                                 goto done;
 111                         }
 112
 113                         if (!test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS,
 114                                               &io_req->req_flags)) {
 115                                 rc = bnx2fc_initiate_abts(io_req);
 116                                 if (rc == SUCCESS)
 117                                         goto done;
 118                                 /*
 119                                  * Explicitly logo the target if
 120                                  * abts initiation fails
 121                                  */
 122                                 lport = io_req->port->lport;
 123                                 rdata = io_req->tgt->rdata;
 124                                 logo_issued = test_and_set_bit(
 125                                                 BNX2FC_FLAG_EXPL_LOGO,
 126                                                 &tgt->flags);
 127                                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
 128                                 spin_unlock_bh(&tgt->tgt_lock);
 129
 130                                 if (!logo_issued) {
 131                                         BNX2FC_IO_DBG(io_req, "Explicit "
 132                                                    "logo - tgt flags = 0x%lx\n",
 133                                                    tgt->flags);
 134
 135
 136                                         mutex_lock(&lport->disc.disc_mutex);
 137                                         lport->tt.rport_logoff(rdata);
 138                                         mutex_unlock(&lport->disc.disc_mutex);
 139                                 }
 140                                 return;
 141                         } else {
 142                                 BNX2FC_IO_DBG(io_req, "IO already in "
 143                                                       "ABTS processing\n");
 144                         }
 145                 }
 146                 break;
 147         case BNX2FC_ELS:
 148
 149                 if (test_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags)) {
 150                         BNX2FC_IO_DBG(io_req, "ABTS for ELS timed out\n");
 151
 152                         if (!test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
 153                                               &io_req->req_flags)) {
 154                                 lport = io_req->port->lport;
 155                                 rdata = io_req->tgt->rdata;
 156                                 logo_issued = test_and_set_bit(
 157                                                 BNX2FC_FLAG_EXPL_LOGO,
 158                                                 &tgt->flags);
 159                                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
 160                                 spin_unlock_bh(&tgt->tgt_lock);
 161
 162                                 /* Explicitly logo the target */
 163                                 if (!logo_issued) {
 164                                         BNX2FC_IO_DBG(io_req, "Explicitly logo"
 165                                                    "(els)\n");
 166                                         mutex_lock(&lport->disc.disc_mutex);
 167                                         lport->tt.rport_logoff(rdata);
 168                                         mutex_unlock(&lport->disc.disc_mutex);
 169                                 }
 170                                 return;
 171                         }
 172                 } else {
 173                         /*
 174                          * Handle ELS timeout.
 175                          * tgt_lock is used to sync compl path and timeout
 176                          * path. If els compl path is processing this IO, we
 177                          * have nothing to do here, just release the timer hold
 178                          */
 179                         BNX2FC_IO_DBG(io_req, "ELS timed out\n");
 180                         if (test_and_set_bit(BNX2FC_FLAG_ELS_DONE,
 181                                                &io_req->req_flags))
 182                                 goto done;
 183
 184                         /* Indicate the cb_func that this ELS is timed out */
 185                         set_bit(BNX2FC_FLAG_ELS_TIMEOUT, &io_req->req_flags);
 186
 187                         if ((io_req->cb_func) && (io_req->cb_arg)) {
 188                                 io_req->cb_func(io_req->cb_arg);
 189                                 io_req->cb_arg = NULL;
 190                         }
 191                 }
 192                 break;
 193         default:
 194                 printk(KERN_ERR PFX "cmd_timeout: invalid cmd_type %d\n",
 195                         cmd_type);
 196                 break;
 197         }
 198
 199 done:
 200         /* release the cmd that was held when timer was set */
 201         kref_put(&io_req->refcount, bnx2fc_cmd_release);
 202         spin_unlock_bh(&tgt->tgt_lock);
 203 }
 204
 205 static void bnx2fc_scsi_done(struct bnx2fc_cmd *io_req, int err_code)
 206 {
 207         /* Called with host lock held */
 208         struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
 209
 210         /*
 211          * active_cmd_queue may have other command types as well,
 212          * and during flush operation,  we want to error back only
 213          * scsi commands.
 214          */
 215         if (io_req->cmd_type != BNX2FC_SCSI_CMD)
 216                 return;
 217
 218         BNX2FC_IO_DBG(io_req, "scsi_done. err_code = 0x%x\n", err_code);
 219         if (test_bit(BNX2FC_FLAG_CMD_LOST, &io_req->req_flags)) {
 220                 /* Do not call scsi done for this IO */
 221                 return;
 222         }
 223
 224         bnx2fc_unmap_sg_list(io_req);
 225         io_req->sc_cmd = NULL;
 226         if (!sc_cmd) {
 227                 printk(KERN_ERR PFX "scsi_done - sc_cmd NULL. "
 228                                     "IO(0x%x) already cleaned up\n",
 229                        io_req->xid);
 230                 return;
 231         }
 232         sc_cmd->result = err_code << 16;
 233
 234         BNX2FC_IO_DBG(io_req, "sc=%p, result=0x%x, retries=%d, allowed=%d\n",
 235                 sc_cmd, host_byte(sc_cmd->result), sc_cmd->retries,
 236                 sc_cmd->allowed);
 237         scsi_set_resid(sc_cmd, scsi_bufflen(sc_cmd));
 238         sc_cmd->SCp.ptr = NULL;
 239         sc_cmd->scsi_done(sc_cmd);
 240 }
 241
 242 struct bnx2fc_cmd_mgr *bnx2fc_cmd_mgr_alloc(struct bnx2fc_hba *hba)
 243 {
 244         struct bnx2fc_cmd_mgr *cmgr;
 245         struct io_bdt *bdt_info;
 246         struct bnx2fc_cmd *io_req;
 247         size_t len;
 248         u32 mem_size;
 249         u16 xid;
 250         int i;
 251         int num_ios, num_pri_ios;
 252         size_t bd_tbl_sz;
 253         int arr_sz = num_possible_cpus() + 1;
 254         u16 min_xid = BNX2FC_MIN_XID;
 255         u16 max_xid = hba->max_xid;
 256
 257         if (max_xid <= min_xid || max_xid == FC_XID_UNKNOWN) {
 258                 printk(KERN_ERR PFX "cmd_mgr_alloc: Invalid min_xid 0x%x \
 259                                         and max_xid 0x%x\n", min_xid, max_xid);
 260                 return NULL;
 261         }
 262         BNX2FC_MISC_DBG("min xid 0x%x, max xid 0x%x\n", min_xid, max_xid);
 263
 264         num_ios = max_xid - min_xid + 1;
 265         len = (num_ios * (sizeof(struct bnx2fc_cmd *)));
 266         len += sizeof(struct bnx2fc_cmd_mgr);
 267
 268         cmgr = kzalloc(len, GFP_KERNEL);
 269         if (!cmgr) {
 270                 printk(KERN_ERR PFX "failed to alloc cmgr\n");
 271                 return NULL;
 272         }
 273
 274         cmgr->free_list = kzalloc(sizeof(*cmgr->free_list) *
 275                                   arr_sz, GFP_KERNEL);
 276         if (!cmgr->free_list) {
 277                 printk(KERN_ERR PFX "failed to alloc free_list\n");
 278                 goto mem_err;
 279         }
 280
 281         cmgr->free_list_lock = kzalloc(sizeof(*cmgr->free_list_lock) *
 282                                        arr_sz, GFP_KERNEL);
 283         if (!cmgr->free_list_lock) {
 284                 printk(KERN_ERR PFX "failed to alloc free_list_lock\n");
 285                 kfree(cmgr->free_list);
 286                 cmgr->free_list = NULL;
 287                 goto mem_err;
 288         }
 289
 290         cmgr->hba = hba;
 291         cmgr->cmds = (struct bnx2fc_cmd **)(cmgr + 1);
 292
 293         for (i = 0; i < arr_sz; i++)  {
 294                 INIT_LIST_HEAD(&cmgr->free_list[i]);
 295                 spin_lock_init(&cmgr->free_list_lock[i]);
 296         }
 297
 298         /*
 299          * Pre-allocated pool of bnx2fc_cmds.
 300          * Last entry in the free list array is the free list
 301          * of slow path requests.
 302          */
 303         xid = BNX2FC_MIN_XID;
 304         num_pri_ios = num_ios - hba->elstm_xids;
 305         for (i = 0; i < num_ios; i++) {
 306                 io_req = kzalloc(sizeof(*io_req), GFP_KERNEL);
 307
 308                 if (!io_req) {
 309                         printk(KERN_ERR PFX "failed to alloc io_req\n");
 310                         goto mem_err;
 311                 }
 312
 313                 INIT_LIST_HEAD(&io_req->link);
 314                 INIT_DELAYED_WORK(&io_req->timeout_work, bnx2fc_cmd_timeout);
 315
 316                 io_req->xid = xid++;
 317                 if (i < num_pri_ios)
 318                         list_add_tail(&io_req->link,
 319                                 &cmgr->free_list[io_req->xid %
 320                                                  num_possible_cpus()]);
 321                 else
 322                         list_add_tail(&io_req->link,
 323                                 &cmgr->free_list[num_possible_cpus()]);
 324                 io_req++;
 325         }
 326
 327         /* Allocate pool of io_bdts - one for each bnx2fc_cmd */
 328         mem_size = num_ios * sizeof(struct io_bdt *);
 329         cmgr->io_bdt_pool = kmalloc(mem_size, GFP_KERNEL);
 330         if (!cmgr->io_bdt_pool) {
 331                 printk(KERN_ERR PFX "failed to alloc io_bdt_pool\n");
 332                 goto mem_err;
 333         }
 334
 335         mem_size = sizeof(struct io_bdt);
 336         for (i = 0; i < num_ios; i++) {
 337                 cmgr->io_bdt_pool[i] = kmalloc(mem_size, GFP_KERNEL);
 338                 if (!cmgr->io_bdt_pool[i]) {
 339                         printk(KERN_ERR PFX "failed to alloc "
 340                                 "io_bdt_pool[%d]\n", i);
 341                         goto mem_err;
 342                 }
 343         }
 344
 345         /* Allocate an map fcoe_bdt_ctx structures */
 346         bd_tbl_sz = BNX2FC_MAX_BDS_PER_CMD * sizeof(struct fcoe_bd_ctx);
 347         for (i = 0; i < num_ios; i++) {
 348                 bdt_info = cmgr->io_bdt_pool[i];
 349                 bdt_info->bd_tbl = dma_alloc_coherent(&hba->pcidev->dev,
 350                                                       bd_tbl_sz,
 351                                                       &bdt_info->bd_tbl_dma,
 352                                                       GFP_KERNEL);
 353                 if (!bdt_info->bd_tbl) {
 354                         printk(KERN_ERR PFX "failed to alloc "
 355                                 "bdt_tbl[%d]\n", i);
 356                         goto mem_err;
 357                 }
 358         }
 359
 360         return cmgr;
 361
 362 mem_err:
 363         bnx2fc_cmd_mgr_free(cmgr);
 364         return NULL;
 365 }
 366
 367 void bnx2fc_cmd_mgr_free(struct bnx2fc_cmd_mgr *cmgr)
 368 {
 369         struct io_bdt *bdt_info;
 370         struct bnx2fc_hba *hba = cmgr->hba;
 371         size_t bd_tbl_sz;
 372         u16 min_xid = BNX2FC_MIN_XID;
 373         u16 max_xid = hba->max_xid;
 374         int num_ios;
 375         int i;
 376
 377         num_ios = max_xid - min_xid + 1;
 378
 379         /* Free fcoe_bdt_ctx structures */
 380         if (!cmgr->io_bdt_pool)
 381                 goto free_cmd_pool;
 382
 383         bd_tbl_sz = BNX2FC_MAX_BDS_PER_CMD * sizeof(struct fcoe_bd_ctx);
 384         for (i = 0; i < num_ios; i++) {
 385                 bdt_info = cmgr->io_bdt_pool[i];
 386                 if (bdt_info->bd_tbl) {
 387                         dma_free_coherent(&hba->pcidev->dev, bd_tbl_sz,
 388                                             bdt_info->bd_tbl,
 389                                             bdt_info->bd_tbl_dma);
 390                         bdt_info->bd_tbl = NULL;
 391                 }
 392         }
 393
 394         /* Destroy io_bdt pool */
 395         for (i = 0; i < num_ios; i++) {
 396                 kfree(cmgr->io_bdt_pool[i]);
 397                 cmgr->io_bdt_pool[i] = NULL;
 398         }
 399
 400         kfree(cmgr->io_bdt_pool);
 401         cmgr->io_bdt_pool = NULL;
 402
 403 free_cmd_pool:
 404         kfree(cmgr->free_list_lock);
 405
 406         /* Destroy cmd pool */
 407         if (!cmgr->free_list)
 408                 goto free_cmgr;
 409
 410         for (i = 0; i < num_possible_cpus() + 1; i++)  {
 411                 struct bnx2fc_cmd *tmp, *io_req;
 412
 413                 list_for_each_entry_safe(io_req, tmp,
 414                                          &cmgr->free_list[i], link) {
 415                         list_del(&io_req->link);
 416                         kfree(io_req);
 417                 }
 418         }
 419         kfree(cmgr->free_list);
 420 free_cmgr:
 421         /* Free command manager itself */
 422         kfree(cmgr);
 423 }
 424
 425 struct bnx2fc_cmd *bnx2fc_elstm_alloc(struct bnx2fc_rport *tgt, int type)
 426 {
 427         struct fcoe_port *port = tgt->port;
 428         struct bnx2fc_interface *interface = port->priv;
 429         struct bnx2fc_cmd_mgr *cmd_mgr = interface->hba->cmd_mgr;
 430         struct bnx2fc_cmd *io_req;
 431         struct list_head *listp;
 432         struct io_bdt *bd_tbl;
 433         int index = RESERVE_FREE_LIST_INDEX;
 434         u32 free_sqes;
 435         u32 max_sqes;
 436         u16 xid;
 437
 438         max_sqes = tgt->max_sqes;
 439         switch (type) {
 440         case BNX2FC_TASK_MGMT_CMD:
 441                 max_sqes = BNX2FC_TM_MAX_SQES;
 442                 break;
 443         case BNX2FC_ELS:
 444                 max_sqes = BNX2FC_ELS_MAX_SQES;
 445                 break;
 446         default:
 447                 break;
 448         }
 449
 450         /*
 451          * NOTE: Free list insertions and deletions are protected with
 452          * cmgr lock
 453          */
 454         spin_lock_bh(&cmd_mgr->free_list_lock[index]);
 455         free_sqes = atomic_read(&tgt->free_sqes);
 456         if ((list_empty(&(cmd_mgr->free_list[index]))) ||
 457             (tgt->num_active_ios.counter  >= max_sqes) ||
 458             (free_sqes + max_sqes <= BNX2FC_SQ_WQES_MAX)) {
 459                 BNX2FC_TGT_DBG(tgt, "No free els_tm cmds available "
 460                         "ios(%d):sqes(%d)\n",
 461                         tgt->num_active_ios.counter, tgt->max_sqes);
 462                 if (list_empty(&(cmd_mgr->free_list[index])))
 463                         printk(KERN_ERR PFX "elstm_alloc: list_empty\n");
 464                 spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
 465                 return NULL;
 466         }
 467
 468         listp = (struct list_head *)
 469                         cmd_mgr->free_list[index].next;
 470         list_del_init(listp);
 471         io_req = (struct bnx2fc_cmd *) listp;
 472         xid = io_req->xid;
 473         cmd_mgr->cmds[xid] = io_req;
 474         atomic_inc(&tgt->num_active_ios);
 475         atomic_dec(&tgt->free_sqes);
 476         spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
 477
 478         INIT_LIST_HEAD(&io_req->link);
 479
 480         io_req->port = port;
 481         io_req->cmd_mgr = cmd_mgr;
 482         io_req->req_flags = 0;
 483         io_req->cmd_type = type;
 484
 485         /* Bind io_bdt for this io_req */
 486         /* Have a static link between io_req and io_bdt_pool */
 487         bd_tbl = io_req->bd_tbl = cmd_mgr->io_bdt_pool[xid];
 488         bd_tbl->io_req = io_req;
 489
 490         /* Hold the io_req  against deletion */
 491         kref_init(&io_req->refcount);
 492         return io_req;
 493 }
 494
 495 struct bnx2fc_cmd *bnx2fc_cmd_alloc(struct bnx2fc_rport *tgt)
 496 {
 497         struct fcoe_port *port = tgt->port;
 498         struct bnx2fc_interface *interface = port->priv;
 499         struct bnx2fc_cmd_mgr *cmd_mgr = interface->hba->cmd_mgr;
 500         struct bnx2fc_cmd *io_req;
 501         struct list_head *listp;
 502         struct io_bdt *bd_tbl;
 503         u32 free_sqes;
 504         u32 max_sqes;
 505         u16 xid;
 506         int index = get_cpu();
 507
 508         max_sqes = BNX2FC_SCSI_MAX_SQES;
 509         /*
 510          * NOTE: Free list insertions and deletions are protected with
 511          * cmgr lock
 512          */
 513         spin_lock_bh(&cmd_mgr->free_list_lock[index]);
 514         free_sqes = atomic_read(&tgt->free_sqes);
 515         if ((list_empty(&cmd_mgr->free_list[index])) ||
 516             (tgt->num_active_ios.counter  >= max_sqes) ||
 517             (free_sqes + max_sqes <= BNX2FC_SQ_WQES_MAX)) {
 518                 spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
 519                 put_cpu();
 520                 return NULL;
 521         }
 522
 523         listp = (struct list_head *)
 524                 cmd_mgr->free_list[index].next;
 525         list_del_init(listp);
 526         io_req = (struct bnx2fc_cmd *) listp;
 527         xid = io_req->xid;
 528         cmd_mgr->cmds[xid] = io_req;
 529         atomic_inc(&tgt->num_active_ios);
 530         atomic_dec(&tgt->free_sqes);
 531         spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
 532         put_cpu();
 533
 534         INIT_LIST_HEAD(&io_req->link);
 535
 536         io_req->port = port;
 537         io_req->cmd_mgr = cmd_mgr;
 538         io_req->req_flags = 0;
 539
 540         /* Bind io_bdt for this io_req */
 541         /* Have a static link between io_req and io_bdt_pool */
 542         bd_tbl = io_req->bd_tbl = cmd_mgr->io_bdt_pool[xid];
 543         bd_tbl->io_req = io_req;
 544
 545         /* Hold the io_req  against deletion */
 546         kref_init(&io_req->refcount);
 547         return io_req;
 548 }
 549
 550 void bnx2fc_cmd_release(struct kref *ref)
 551 {
 552         struct bnx2fc_cmd *io_req = container_of(ref,
 553                                                 struct bnx2fc_cmd, refcount);
 554         struct bnx2fc_cmd_mgr *cmd_mgr = io_req->cmd_mgr;
 555         int index;
 556
 557         if (io_req->cmd_type == BNX2FC_SCSI_CMD)
 558                 index = io_req->xid % num_possible_cpus();
 559         else
 560                 index = RESERVE_FREE_LIST_INDEX;
 561
 562
 563         spin_lock_bh(&cmd_mgr->free_list_lock[index]);
 564         if (io_req->cmd_type != BNX2FC_SCSI_CMD)
 565                 bnx2fc_free_mp_resc(io_req);
 566         cmd_mgr->cmds[io_req->xid] = NULL;
 567         /* Delete IO from retire queue */
 568         list_del_init(&io_req->link);
 569         /* Add it to the free list */
 570         list_add(&io_req->link,
 571                         &cmd_mgr->free_list[index]);
 572         atomic_dec(&io_req->tgt->num_active_ios);
 573         spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
 574
 575 }
 576
 577 static void bnx2fc_free_mp_resc(struct bnx2fc_cmd *io_req)
 578 {
 579         struct bnx2fc_mp_req *mp_req = &(io_req->mp_req);
 580         struct bnx2fc_interface *interface = io_req->port->priv;
 581         struct bnx2fc_hba *hba = interface->hba;
 582         size_t sz = sizeof(struct fcoe_bd_ctx);
 583
 584         /* clear tm flags */
 585         mp_req->tm_flags = 0;
 586         if (mp_req->mp_req_bd) {
 587                 dma_free_coherent(&hba->pcidev->dev, sz,
 588                                      mp_req->mp_req_bd,
 589                                      mp_req->mp_req_bd_dma);
 590                 mp_req->mp_req_bd = NULL;
 591         }
 592         if (mp_req->mp_resp_bd) {
 593                 dma_free_coherent(&hba->pcidev->dev, sz,
 594                                      mp_req->mp_resp_bd,
 595                                      mp_req->mp_resp_bd_dma);
 596                 mp_req->mp_resp_bd = NULL;
 597         }
 598         if (mp_req->req_buf) {
 599                 dma_free_coherent(&hba->pcidev->dev, CNIC_PAGE_SIZE,
 600                                      mp_req->req_buf,
 601                                      mp_req->req_buf_dma);
 602                 mp_req->req_buf = NULL;
 603         }
 604         if (mp_req->resp_buf) {
 605                 dma_free_coherent(&hba->pcidev->dev, CNIC_PAGE_SIZE,
 606                                      mp_req->resp_buf,
 607                                      mp_req->resp_buf_dma);
 608                 mp_req->resp_buf = NULL;
 609         }
 610 }
 611
 612 int bnx2fc_init_mp_req(struct bnx2fc_cmd *io_req)
 613 {
 614         struct bnx2fc_mp_req *mp_req;
 615         struct fcoe_bd_ctx *mp_req_bd;
 616         struct fcoe_bd_ctx *mp_resp_bd;
 617         struct bnx2fc_interface *interface = io_req->port->priv;
 618         struct bnx2fc_hba *hba = interface->hba;
 619         dma_addr_t addr;
 620         size_t sz;
 621
 622         mp_req = (struct bnx2fc_mp_req *)&(io_req->mp_req);
 623         memset(mp_req, 0, sizeof(struct bnx2fc_mp_req));
 624
 625         mp_req->req_len = sizeof(struct fcp_cmnd);
 626         io_req->data_xfer_len = mp_req->req_len;
 627         mp_req->req_buf = dma_alloc_coherent(&hba->pcidev->dev, CNIC_PAGE_SIZE,
 628                                              &mp_req->req_buf_dma,
 629                                              GFP_ATOMIC);
 630         if (!mp_req->req_buf) {
 631                 printk(KERN_ERR PFX "unable to alloc MP req buffer\n");
 632                 bnx2fc_free_mp_resc(io_req);
 633                 return FAILED;
 634         }
 635
 636         mp_req->resp_buf = dma_alloc_coherent(&hba->pcidev->dev, CNIC_PAGE_SIZE,
 637                                               &mp_req->resp_buf_dma,
 638                                               GFP_ATOMIC);
 639         if (!mp_req->resp_buf) {
 640                 printk(KERN_ERR PFX "unable to alloc TM resp buffer\n");
 641                 bnx2fc_free_mp_resc(io_req);
 642                 return FAILED;
 643         }
 644         memset(mp_req->req_buf, 0, CNIC_PAGE_SIZE);
 645         memset(mp_req->resp_buf, 0, CNIC_PAGE_SIZE);
 646
 647         /* Allocate and map mp_req_bd and mp_resp_bd */
 648         sz = sizeof(struct fcoe_bd_ctx);
 649         mp_req->mp_req_bd = dma_alloc_coherent(&hba->pcidev->dev, sz,
 650                                                  &mp_req->mp_req_bd_dma,
 651                                                  GFP_ATOMIC);
 652         if (!mp_req->mp_req_bd) {
 653                 printk(KERN_ERR PFX "unable to alloc MP req bd\n");
 654                 bnx2fc_free_mp_resc(io_req);
 655                 return FAILED;
 656         }
 657         mp_req->mp_resp_bd = dma_alloc_coherent(&hba->pcidev->dev, sz,
 658                                                  &mp_req->mp_resp_bd_dma,
 659                                                  GFP_ATOMIC);
 660         if (!mp_req->mp_resp_bd) {
 661                 printk(KERN_ERR PFX "unable to alloc MP resp bd\n");
 662                 bnx2fc_free_mp_resc(io_req);
 663                 return FAILED;
 664         }
 665         /* Fill bd table */
 666         addr = mp_req->req_buf_dma;
 667         mp_req_bd = mp_req->mp_req_bd;
 668         mp_req_bd->buf_addr_lo = (u32)addr & 0xffffffff;
 669         mp_req_bd->buf_addr_hi = (u32)((u64)addr >> 32);
 670         mp_req_bd->buf_len = CNIC_PAGE_SIZE;
 671         mp_req_bd->flags = 0;
 672
 673         /*
 674          * MP buffer is either a task mgmt command or an ELS.
 675          * So the assumption is that it consumes a single bd
 676          * entry in the bd table
 677          */
 678         mp_resp_bd = mp_req->mp_resp_bd;
 679         addr = mp_req->resp_buf_dma;
 680         mp_resp_bd->buf_addr_lo = (u32)addr & 0xffffffff;
 681         mp_resp_bd->buf_addr_hi = (u32)((u64)addr >> 32);
 682         mp_resp_bd->buf_len = CNIC_PAGE_SIZE;
 683         mp_resp_bd->flags = 0;
 684
 685         return SUCCESS;
 686 }
 687
 688 static int bnx2fc_initiate_tmf(struct scsi_cmnd *sc_cmd, u8 tm_flags)
 689 {
 690         struct fc_lport *lport;
 691         struct fc_rport *rport;
 692         struct fc_rport_libfc_priv *rp;
 693         struct fcoe_port *port;
 694         struct bnx2fc_interface *interface;
 695         struct bnx2fc_rport *tgt;
 696         struct bnx2fc_cmd *io_req;
 697         struct bnx2fc_mp_req *tm_req;
 698         struct fcoe_task_ctx_entry *task;
 699         struct fcoe_task_ctx_entry *task_page;
 700         struct Scsi_Host *host = sc_cmd->device->host;
 701         struct fc_frame_header *fc_hdr;
 702         struct fcp_cmnd *fcp_cmnd;
 703         int task_idx, index;
 704         int rc = SUCCESS;
 705         u16 xid;
 706         u32 sid, did;
 707         unsigned long start = jiffies;
 708
 709         lport = shost_priv(host);
 710         rport = starget_to_rport(scsi_target(sc_cmd->device));
 711         port = lport_priv(lport);
 712         interface = port->priv;
 713
 714         if (rport == NULL) {
 715                 printk(KERN_ERR PFX "device_reset: rport is NULL\n");
 716                 rc = FAILED;
 717                 goto tmf_err;
 718         }
 719         rp = rport->dd_data;
 720
 721         rc = fc_block_scsi_eh(sc_cmd);
 722         if (rc)
 723                 return rc;
 724
 725         if (lport->state != LPORT_ST_READY || !(lport->link_up)) {
 726                 printk(KERN_ERR PFX "device_reset: link is not ready\n");
 727                 rc = FAILED;
 728                 goto tmf_err;
 729         }
 730         /* rport and tgt are allocated together, so tgt should be non-NULL */
 731         tgt = (struct bnx2fc_rport *)&rp[1];
 732
 733         if (!(test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags))) {
 734                 printk(KERN_ERR PFX "device_reset: tgt not offloaded\n");
 735                 rc = FAILED;
 736                 goto tmf_err;
 737         }
 738 retry_tmf:
 739         io_req = bnx2fc_elstm_alloc(tgt, BNX2FC_TASK_MGMT_CMD);
 740         if (!io_req) {
 741                 if (time_after(jiffies, start + HZ)) {
 742                         printk(KERN_ERR PFX "tmf: Failed TMF");
 743                         rc = FAILED;
 744                         goto tmf_err;
 745                 }
 746                 msleep(20);
 747                 goto retry_tmf;
 748         }
 749         /* Initialize rest of io_req fields */
 750         io_req->sc_cmd = sc_cmd;
 751         io_req->port = port;
 752         io_req->tgt = tgt;
 753
 754         tm_req = (struct bnx2fc_mp_req *)&(io_req->mp_req);
 755
 756         rc = bnx2fc_init_mp_req(io_req);
 757         if (rc == FAILED) {
 758                 printk(KERN_ERR PFX "Task mgmt MP request init failed\n");
 759                 spin_lock_bh(&tgt->tgt_lock);
 760                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
 761                 spin_unlock_bh(&tgt->tgt_lock);
 762                 goto tmf_err;
 763         }
 764
 765         /* Set TM flags */
 766         io_req->io_req_flags = 0;
 767         tm_req->tm_flags = tm_flags;
 768
 769         /* Fill FCP_CMND */
 770         bnx2fc_build_fcp_cmnd(io_req, (struct fcp_cmnd *)tm_req->req_buf);
 771         fcp_cmnd = (struct fcp_cmnd *)tm_req->req_buf;
 772         memset(fcp_cmnd->fc_cdb, 0,  sc_cmd->cmd_len);
 773         fcp_cmnd->fc_dl = 0;
 774
 775         /* Fill FC header */
 776         fc_hdr = &(tm_req->req_fc_hdr);
 777         sid = tgt->sid;
 778         did = rport->port_id;
 779         __fc_fill_fc_hdr(fc_hdr, FC_RCTL_DD_UNSOL_CMD, did, sid,
 780                            FC_TYPE_FCP, FC_FC_FIRST_SEQ | FC_FC_END_SEQ |
 781                            FC_FC_SEQ_INIT, 0);
 782         /* Obtain exchange id */
 783         xid = io_req->xid;
 784
 785         BNX2FC_TGT_DBG(tgt, "Initiate TMF - xid = 0x%x\n", xid);
 786         task_idx = xid/BNX2FC_TASKS_PER_PAGE;
 787         index = xid % BNX2FC_TASKS_PER_PAGE;
 788
 789         /* Initialize task context for this IO request */
 790         task_page = (struct fcoe_task_ctx_entry *)
 791                         interface->hba->task_ctx[task_idx];
 792         task = &(task_page[index]);
 793         bnx2fc_init_mp_task(io_req, task);
 794
 795         sc_cmd->SCp.ptr = (char *)io_req;
 796
 797         /* Obtain free SQ entry */
 798         spin_lock_bh(&tgt->tgt_lock);
 799         bnx2fc_add_2_sq(tgt, xid);
 800
 801         /* Enqueue the io_req to active_tm_queue */
 802         io_req->on_tmf_queue = 1;
 803         list_add_tail(&io_req->link, &tgt->active_tm_queue);
 804
 805         init_completion(&io_req->tm_done);
 806         io_req->wait_for_comp = 1;
 807
 808         /* Ring doorbell */
 809         bnx2fc_ring_doorbell(tgt);
 810         spin_unlock_bh(&tgt->tgt_lock);
 811
 812         rc = wait_for_completion_timeout(&io_req->tm_done,
 813                                          BNX2FC_TM_TIMEOUT * HZ);
 814         spin_lock_bh(&tgt->tgt_lock);
 815
 816         io_req->wait_for_comp = 0;
 817         if (!(test_bit(BNX2FC_FLAG_TM_COMPL, &io_req->req_flags))) {
 818                 set_bit(BNX2FC_FLAG_TM_TIMEOUT, &io_req->req_flags);
 819                 if (io_req->on_tmf_queue) {
 820                         list_del_init(&io_req->link);
 821                         io_req->on_tmf_queue = 0;
 822                 }
 823                 io_req->wait_for_comp = 1;
 824                 bnx2fc_initiate_cleanup(io_req);
 825                 spin_unlock_bh(&tgt->tgt_lock);
 826                 rc = wait_for_completion_timeout(&io_req->tm_done,
 827                                                  BNX2FC_FW_TIMEOUT);
 828                 spin_lock_bh(&tgt->tgt_lock);
 829                 io_req->wait_for_comp = 0;
 830                 if (!rc)
 831                         kref_put(&io_req->refcount, bnx2fc_cmd_release);
 832         }
 833
 834         spin_unlock_bh(&tgt->tgt_lock);
 835
 836         if (!rc) {
 837                 BNX2FC_TGT_DBG(tgt, "task mgmt command failed...\n");
 838                 rc = FAILED;
 839         } else {
 840                 BNX2FC_TGT_DBG(tgt, "task mgmt command success...\n");
 841                 rc = SUCCESS;
 842         }
 843 tmf_err:
 844         return rc;
 845 }
 846
 847 int bnx2fc_initiate_abts(struct bnx2fc_cmd *io_req)
 848 {
 849         struct fc_lport *lport;
 850         struct bnx2fc_rport *tgt = io_req->tgt;
 851         struct fc_rport *rport = tgt->rport;
 852         struct fc_rport_priv *rdata = tgt->rdata;
 853         struct bnx2fc_interface *interface;
 854         struct fcoe_port *port;
 855         struct bnx2fc_cmd *abts_io_req;
 856         struct fcoe_task_ctx_entry *task;
 857         struct fcoe_task_ctx_entry *task_page;
 858         struct fc_frame_header *fc_hdr;
 859         struct bnx2fc_mp_req *abts_req;
 860         int task_idx, index;
 861         u32 sid, did;
 862         u16 xid;
 863         int rc = SUCCESS;
 864         u32 r_a_tov = rdata->r_a_tov;
 865
 866         /* called with tgt_lock held */
 867         BNX2FC_IO_DBG(io_req, "Entered bnx2fc_initiate_abts\n");
 868
 869         port = io_req->port;
 870         interface = port->priv;
 871         lport = port->lport;
 872
 873         if (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags)) {
 874                 printk(KERN_ERR PFX "initiate_abts: tgt not offloaded\n");
 875                 rc = FAILED;
 876                 goto abts_err;
 877         }
 878
 879         if (rport == NULL) {
 880                 printk(KERN_ERR PFX "initiate_abts: rport is NULL\n");
 881                 rc = FAILED;
 882                 goto abts_err;
 883         }
 884
 885         if (lport->state != LPORT_ST_READY || !(lport->link_up)) {
 886                 printk(KERN_ERR PFX "initiate_abts: link is not ready\n");
 887                 rc = FAILED;
 888                 goto abts_err;
 889         }
 890
 891         abts_io_req = bnx2fc_elstm_alloc(tgt, BNX2FC_ABTS);
 892         if (!abts_io_req) {
 893                 printk(KERN_ERR PFX "abts: couldnt allocate cmd\n");
 894                 rc = FAILED;
 895                 goto abts_err;
 896         }
 897
 898         /* Initialize rest of io_req fields */
 899         abts_io_req->sc_cmd = NULL;
 900         abts_io_req->port = port;
 901         abts_io_req->tgt = tgt;
 902         abts_io_req->data_xfer_len = 0; /* No data transfer for ABTS */
 903
 904         abts_req = (struct bnx2fc_mp_req *)&(abts_io_req->mp_req);
 905         memset(abts_req, 0, sizeof(struct bnx2fc_mp_req));
 906
 907         /* Fill FC header */
 908         fc_hdr = &(abts_req->req_fc_hdr);
 909
 910         /* Obtain oxid and rxid for the original exchange to be aborted */
 911         fc_hdr->fh_ox_id = htons(io_req->xid);
 912         fc_hdr->fh_rx_id = htons(io_req->task->rxwr_txrd.var_ctx.rx_id);
 913
 914         sid = tgt->sid;
 915         did = rport->port_id;
 916
 917         __fc_fill_fc_hdr(fc_hdr, FC_RCTL_BA_ABTS, did, sid,
 918                            FC_TYPE_BLS, FC_FC_FIRST_SEQ | FC_FC_END_SEQ |
 919                            FC_FC_SEQ_INIT, 0);
 920
 921         xid = abts_io_req->xid;
 922         BNX2FC_IO_DBG(abts_io_req, "ABTS io_req\n");
 923         task_idx = xid/BNX2FC_TASKS_PER_PAGE;
 924         index = xid % BNX2FC_TASKS_PER_PAGE;
 925
 926         /* Initialize task context for this IO request */
 927         task_page = (struct fcoe_task_ctx_entry *)
 928                         interface->hba->task_ctx[task_idx];
 929         task = &(task_page[index]);
 930         bnx2fc_init_mp_task(abts_io_req, task);
 931
 932         /*
 933          * ABTS task is a temporary task that will be cleaned up
 934          * irrespective of ABTS response. We need to start the timer
 935          * for the original exchange, as the CQE is posted for the original
 936          * IO request.
 937          *
 938          * Timer for ABTS is started only when it is originated by a
 939          * TM request. For the ABTS issued as part of ULP timeout,
 940          * scsi-ml maintains the timers.
 941          */
 942
 943         /* if (test_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags))*/
 944         bnx2fc_cmd_timer_set(io_req, 2 * r_a_tov);
 945
 946         /* Obtain free SQ entry */
 947         bnx2fc_add_2_sq(tgt, xid);
 948
 949         /* Ring doorbell */
 950         bnx2fc_ring_doorbell(tgt);
 951
 952 abts_err:
 953         return rc;
 954 }
 955
 956 int bnx2fc_initiate_seq_cleanup(struct bnx2fc_cmd *orig_io_req, u32 offset,
 957                                 enum fc_rctl r_ctl)
 958 {
 959         struct fc_lport *lport;
 960         struct bnx2fc_rport *tgt = orig_io_req->tgt;
 961         struct bnx2fc_interface *interface;
 962         struct fcoe_port *port;
 963         struct bnx2fc_cmd *seq_clnp_req;
 964         struct fcoe_task_ctx_entry *task;
 965         struct fcoe_task_ctx_entry *task_page;
 966         struct bnx2fc_els_cb_arg *cb_arg = NULL;
 967         int task_idx, index;
 968         u16 xid;
 969         int rc = 0;
 970
 971         BNX2FC_IO_DBG(orig_io_req, "bnx2fc_initiate_seq_cleanup xid = 0x%x\n",
 972                    orig_io_req->xid);
 973         kref_get(&orig_io_req->refcount);
 974
 975         port = orig_io_req->port;
 976         interface = port->priv;
 977         lport = port->lport;
 978
 979         cb_arg = kzalloc(sizeof(struct bnx2fc_els_cb_arg), GFP_ATOMIC);
 980         if (!cb_arg) {
 981                 printk(KERN_ERR PFX "Unable to alloc cb_arg for seq clnup\n");
 982                 rc = -ENOMEM;
 983                 goto cleanup_err;
 984         }
 985
 986         seq_clnp_req = bnx2fc_elstm_alloc(tgt, BNX2FC_SEQ_CLEANUP);
 987         if (!seq_clnp_req) {
 988                 printk(KERN_ERR PFX "cleanup: couldnt allocate cmd\n");
 989                 rc = -ENOMEM;
 990                 kfree(cb_arg);
 991                 goto cleanup_err;
 992         }
 993         /* Initialize rest of io_req fields */
 994         seq_clnp_req->sc_cmd = NULL;
 995         seq_clnp_req->port = port;
 996         seq_clnp_req->tgt = tgt;
 997         seq_clnp_req->data_xfer_len = 0; /* No data transfer for cleanup */
 998
 999         xid = seq_clnp_req->xid;
1000
1001         task_idx = xid/BNX2FC_TASKS_PER_PAGE;
1002         index = xid % BNX2FC_TASKS_PER_PAGE;
1003
1004         /* Initialize task context for this IO request */
1005         task_page = (struct fcoe_task_ctx_entry *)
1006                      interface->hba->task_ctx[task_idx];
1007         task = &(task_page[index]);
1008         cb_arg->aborted_io_req = orig_io_req;
1009         cb_arg->io_req = seq_clnp_req;
1010         cb_arg->r_ctl = r_ctl;
1011         cb_arg->offset = offset;
1012         seq_clnp_req->cb_arg = cb_arg;
1013
1014         printk(KERN_ERR PFX "call init_seq_cleanup_task\n");
1015         bnx2fc_init_seq_cleanup_task(seq_clnp_req, task, orig_io_req, offset);
1016
1017         /* Obtain free SQ entry */
1018         bnx2fc_add_2_sq(tgt, xid);
1019
1020         /* Ring doorbell */
1021         bnx2fc_ring_doorbell(tgt);
1022 cleanup_err:
1023         return rc;
1024 }
1025
1026 int bnx2fc_initiate_cleanup(struct bnx2fc_cmd *io_req)
1027 {
1028         struct fc_lport *lport;
1029         struct bnx2fc_rport *tgt = io_req->tgt;
1030         struct bnx2fc_interface *interface;
1031         struct fcoe_port *port;
1032         struct bnx2fc_cmd *cleanup_io_req;
1033         struct fcoe_task_ctx_entry *task;
1034         struct fcoe_task_ctx_entry *task_page;
1035         int task_idx, index;
1036         u16 xid, orig_xid;
1037         int rc = 0;
1038
1039         /* ASSUMPTION: called with tgt_lock held */
1040         BNX2FC_IO_DBG(io_req, "Entered bnx2fc_initiate_cleanup\n");
1041
1042         port = io_req->port;
1043         interface = port->priv;
1044         lport = port->lport;
1045
1046         cleanup_io_req = bnx2fc_elstm_alloc(tgt, BNX2FC_CLEANUP);
1047         if (!cleanup_io_req) {
1048                 printk(KERN_ERR PFX "cleanup: couldnt allocate cmd\n");
1049                 rc = -1;
1050                 goto cleanup_err;
1051         }
1052
1053         /* Initialize rest of io_req fields */
1054         cleanup_io_req->sc_cmd = NULL;
1055         cleanup_io_req->port = port;
1056         cleanup_io_req->tgt = tgt;
1057         cleanup_io_req->data_xfer_len = 0; /* No data transfer for cleanup */
1058
1059         xid = cleanup_io_req->xid;
1060
1061         task_idx = xid/BNX2FC_TASKS_PER_PAGE;
1062         index = xid % BNX2FC_TASKS_PER_PAGE;
1063
1064         /* Initialize task context for this IO request */
1065         task_page = (struct fcoe_task_ctx_entry *)
1066                         interface->hba->task_ctx[task_idx];
1067         task = &(task_page[index]);
1068         orig_xid = io_req->xid;
1069
1070         BNX2FC_IO_DBG(io_req, "CLEANUP io_req xid = 0x%x\n", xid);
1071
1072         bnx2fc_init_cleanup_task(cleanup_io_req, task, orig_xid);
1073
1074         /* Obtain free SQ entry */
1075         bnx2fc_add_2_sq(tgt, xid);
1076
1077         /* Ring doorbell */
1078         bnx2fc_ring_doorbell(tgt);
1079
1080 cleanup_err:
1081         return rc;
1082 }
1083
1084 /**
1085  * bnx2fc_eh_target_reset: Reset a target
1086  *
1087  * @sc_cmd:     SCSI command
1088  *
1089  * Set from SCSI host template to send task mgmt command to the target
1090  *      and wait for the response
1091  */
1092 int bnx2fc_eh_target_reset(struct scsi_cmnd *sc_cmd)
1093 {
1094         return bnx2fc_initiate_tmf(sc_cmd, FCP_TMF_TGT_RESET);
1095 }
1096
1097 /**
1098  * bnx2fc_eh_device_reset - Reset a single LUN
1099  *
1100  * @sc_cmd:     SCSI command
1101  *
1102  * Set from SCSI host template to send task mgmt command to the target
1103  *      and wait for the response
1104  */
1105 int bnx2fc_eh_device_reset(struct scsi_cmnd *sc_cmd)
1106 {
1107         return bnx2fc_initiate_tmf(sc_cmd, FCP_TMF_LUN_RESET);
1108 }
1109
1110 int bnx2fc_expl_logo(struct fc_lport *lport, struct bnx2fc_cmd *io_req)
1111 {
1112         struct bnx2fc_rport *tgt = io_req->tgt;
1113         struct fc_rport_priv *rdata = tgt->rdata;
1114         int logo_issued;
1115         int rc = SUCCESS;
1116         int wait_cnt = 0;
1117
1118         BNX2FC_IO_DBG(io_req, "Expl logo - tgt flags = 0x%lx\n",
1119                       tgt->flags);
1120         logo_issued = test_and_set_bit(BNX2FC_FLAG_EXPL_LOGO,
1121                                        &tgt->flags);
1122         io_req->wait_for_comp = 1;
1123         bnx2fc_initiate_cleanup(io_req);
1124
1125         spin_unlock_bh(&tgt->tgt_lock);
1126
1127         wait_for_completion(&io_req->tm_done);
1128
1129         io_req->wait_for_comp = 0;
1130         /*
1131          * release the reference taken in eh_abort to allow the
1132          * target to re-login after flushing IOs
1133          */
1134          kref_put(&io_req->refcount, bnx2fc_cmd_release);
1135
1136         if (!logo_issued) {
1137                 clear_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags);
1138                 mutex_lock(&lport->disc.disc_mutex);
1139                 lport->tt.rport_logoff(rdata);
1140                 mutex_unlock(&lport->disc.disc_mutex);
1141                 do {
1142                         msleep(BNX2FC_RELOGIN_WAIT_TIME);
1143                         if (wait_cnt++ > BNX2FC_RELOGIN_WAIT_CNT) {
1144                                 rc = FAILED;
1145                                 break;
1146                         }
1147                 } while (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags));
1148         }
1149         spin_lock_bh(&tgt->tgt_lock);
1150         return rc;
1151 }
1152 /**
1153  * bnx2fc_eh_abort - eh_abort_handler api to abort an outstanding
1154  *                      SCSI command
1155  *
1156  * @sc_cmd:     SCSI_ML command pointer
1157  *
1158  * SCSI abort request handler
1159  */
1160 int bnx2fc_eh_abort(struct scsi_cmnd *sc_cmd)
1161 {
1162         struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
1163         struct fc_rport_libfc_priv *rp = rport->dd_data;
1164         struct bnx2fc_cmd *io_req;
1165         struct fc_lport *lport;
1166         struct bnx2fc_rport *tgt;
1167         int rc = FAILED;
1168
1169
1170         rc = fc_block_scsi_eh(sc_cmd);
1171         if (rc)
1172                 return rc;
1173
1174         lport = shost_priv(sc_cmd->device->host);
1175         if ((lport->state != LPORT_ST_READY) || !(lport->link_up)) {
1176                 printk(KERN_ERR PFX "eh_abort: link not ready\n");
1177                 return rc;
1178         }
1179
1180         tgt = (struct bnx2fc_rport *)&rp[1];
1181
1182         BNX2FC_TGT_DBG(tgt, "Entered bnx2fc_eh_abort\n");
1183
1184         spin_lock_bh(&tgt->tgt_lock);
1185         io_req = (struct bnx2fc_cmd *)sc_cmd->SCp.ptr;
1186         if (!io_req) {
1187                 /* Command might have just completed */
1188                 printk(KERN_ERR PFX "eh_abort: io_req is NULL\n");
1189                 spin_unlock_bh(&tgt->tgt_lock);
1190                 return SUCCESS;
1191         }
1192         BNX2FC_IO_DBG(io_req, "eh_abort - refcnt = %d\n",
1193                       io_req->refcount.refcount.counter);
1194
1195         /* Hold IO request across abort processing */
1196         kref_get(&io_req->refcount);
1197
1198         BUG_ON(tgt != io_req->tgt);
1199
1200         /* Remove the io_req from the active_q. */
1201         /*
1202          * Task Mgmt functions (LUN RESET & TGT RESET) will not
1203          * issue an ABTS on this particular IO req, as the
1204          * io_req is no longer in the active_q.
1205          */
1206         if (tgt->flush_in_prog) {
1207                 printk(KERN_ERR PFX "eh_abort: io_req (xid = 0x%x) "
1208                         "flush in progress\n", io_req->xid);
1209                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1210                 spin_unlock_bh(&tgt->tgt_lock);
1211                 return SUCCESS;
1212         }
1213
1214         if (io_req->on_active_queue == 0) {
1215                 printk(KERN_ERR PFX "eh_abort: io_req (xid = 0x%x) "
1216                                 "not on active_q\n", io_req->xid);
1217                 /*
1218                  * This condition can happen only due to the FW bug,
1219                  * where we do not receive cleanup response from
1220                  * the FW. Handle this case gracefully by erroring
1221                  * back the IO request to SCSI-ml
1222                  */
1223                 bnx2fc_scsi_done(io_req, DID_ABORT);
1224
1225                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1226                 spin_unlock_bh(&tgt->tgt_lock);
1227                 return SUCCESS;
1228         }
1229
1230         /*
1231          * Only eh_abort processing will remove the IO from
1232          * active_cmd_q before processing the request. this is
1233          * done to avoid race conditions between IOs aborted
1234          * as part of task management completion and eh_abort
1235          * processing
1236          */
1237         list_del_init(&io_req->link);
1238         io_req->on_active_queue = 0;
1239         /* Move IO req to retire queue */
1240         list_add_tail(&io_req->link, &tgt->io_retire_queue);
1241
1242         init_completion(&io_req->tm_done);
1243
1244         if (test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags)) {
1245                 printk(KERN_ERR PFX "eh_abort: io_req (xid = 0x%x) "
1246                                 "already in abts processing\n", io_req->xid);
1247                 if (cancel_delayed_work(&io_req->timeout_work))
1248                         kref_put(&io_req->refcount,
1249                                  bnx2fc_cmd_release); /* drop timer hold */
1250                 rc = bnx2fc_expl_logo(lport, io_req);
1251                 /* This only occurs when an task abort was requested while ABTS
1252                    is in progress.  Setting the IO_CLEANUP flag will skip the
1253                    RRQ process in the case when the fw generated SCSI_CMD cmpl
1254                    was a result from the ABTS request rather than the CLEANUP
1255                    request */
1256                 set_bit(BNX2FC_FLAG_IO_CLEANUP, &io_req->req_flags);
1257                 goto out;
1258         }
1259
1260         /* Cancel the current timer running on this io_req */
1261         if (cancel_delayed_work(&io_req->timeout_work))
1262                 kref_put(&io_req->refcount,
1263                          bnx2fc_cmd_release); /* drop timer hold */
1264         set_bit(BNX2FC_FLAG_EH_ABORT, &io_req->req_flags);
1265         io_req->wait_for_comp = 1;
1266         rc = bnx2fc_initiate_abts(io_req);
1267         if (rc == FAILED) {
1268                 bnx2fc_initiate_cleanup(io_req);
1269                 spin_unlock_bh(&tgt->tgt_lock);
1270                 wait_for_completion(&io_req->tm_done);
1271                 spin_lock_bh(&tgt->tgt_lock);
1272                 io_req->wait_for_comp = 0;
1273                 goto done;
1274         }
1275         spin_unlock_bh(&tgt->tgt_lock);
1276
1277         wait_for_completion(&io_req->tm_done);
1278
1279         spin_lock_bh(&tgt->tgt_lock);
1280         io_req->wait_for_comp = 0;
1281         if (test_bit(BNX2FC_FLAG_IO_COMPL, &io_req->req_flags)) {
1282                 BNX2FC_IO_DBG(io_req, "IO completed in a different context\n");
1283                 rc = SUCCESS;
1284         } else if (!(test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
1285                                       &io_req->req_flags))) {
1286                 /* Let the scsi-ml try to recover this command */
1287                 printk(KERN_ERR PFX "abort failed, xid = 0x%x\n",
1288                        io_req->xid);
1289                 rc = bnx2fc_expl_logo(lport, io_req);
1290                 goto out;
1291         } else {
1292                 /*
1293                  * We come here even when there was a race condition
1294                  * between timeout and abts completion, and abts
1295                  * completion happens just in time.
1296                  */
1297                 BNX2FC_IO_DBG(io_req, "abort succeeded\n");
1298                 rc = SUCCESS;
1299                 bnx2fc_scsi_done(io_req, DID_ABORT);
1300                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1301         }
1302 done:
1303         /* release the reference taken in eh_abort */
1304         kref_put(&io_req->refcount, bnx2fc_cmd_release);
1305 out:
1306         spin_unlock_bh(&tgt->tgt_lock);
1307         return rc;
1308 }
1309
1310 void bnx2fc_process_seq_cleanup_compl(struct bnx2fc_cmd *seq_clnp_req,
1311                                       struct fcoe_task_ctx_entry *task,
1312                                       u8 rx_state)
1313 {
1314         struct bnx2fc_els_cb_arg *cb_arg = seq_clnp_req->cb_arg;
1315         struct bnx2fc_cmd *orig_io_req = cb_arg->aborted_io_req;
1316         u32 offset = cb_arg->offset;
1317         enum fc_rctl r_ctl = cb_arg->r_ctl;
1318         int rc = 0;
1319         struct bnx2fc_rport *tgt = orig_io_req->tgt;
1320
1321         BNX2FC_IO_DBG(orig_io_req, "Entered process_cleanup_compl xid = 0x%x"
1322                               "cmd_type = %d\n",
1323                    seq_clnp_req->xid, seq_clnp_req->cmd_type);
1324
1325         if (rx_state == FCOE_TASK_RX_STATE_IGNORED_SEQUENCE_CLEANUP) {
1326                 printk(KERN_ERR PFX "seq cleanup ignored - xid = 0x%x\n",
1327                         seq_clnp_req->xid);
1328                 goto free_cb_arg;
1329         }
1330
1331         spin_unlock_bh(&tgt->tgt_lock);
1332         rc = bnx2fc_send_srr(orig_io_req, offset, r_ctl);
1333         spin_lock_bh(&tgt->tgt_lock);
1334
1335         if (rc)
1336                 printk(KERN_ERR PFX "clnup_compl: Unable to send SRR"
1337                         " IO will abort\n");
1338         seq_clnp_req->cb_arg = NULL;
1339         kref_put(&orig_io_req->refcount, bnx2fc_cmd_release);
1340 free_cb_arg:
1341         kfree(cb_arg);
1342         return;
1343 }
1344
1345 void bnx2fc_process_cleanup_compl(struct bnx2fc_cmd *io_req,
1346                                   struct fcoe_task_ctx_entry *task,
1347                                   u8 num_rq)
1348 {
1349         BNX2FC_IO_DBG(io_req, "Entered process_cleanup_compl "
1350                               "refcnt = %d, cmd_type = %d\n",
1351                    io_req->refcount.refcount.counter, io_req->cmd_type);
1352         bnx2fc_scsi_done(io_req, DID_ERROR);
1353         kref_put(&io_req->refcount, bnx2fc_cmd_release);
1354         if (io_req->wait_for_comp)
1355                 complete(&io_req->tm_done);
1356 }
1357
1358 void bnx2fc_process_abts_compl(struct bnx2fc_cmd *io_req,
1359                                struct fcoe_task_ctx_entry *task,
1360                                u8 num_rq)
1361 {
1362         u32 r_ctl;
1363         u32 r_a_tov = FC_DEF_R_A_TOV;
1364         u8 issue_rrq = 0;
1365         struct bnx2fc_rport *tgt = io_req->tgt;
1366
1367         BNX2FC_IO_DBG(io_req, "Entered process_abts_compl xid = 0x%x"
1368                               "refcnt = %d, cmd_type = %d\n",
1369                    io_req->xid,
1370                    io_req->refcount.refcount.counter, io_req->cmd_type);
1371
1372         if (test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
1373                                        &io_req->req_flags)) {
1374                 BNX2FC_IO_DBG(io_req, "Timer context finished processing"
1375                                 " this io\n");
1376                 return;
1377         }
1378
1379         /* Do not issue RRQ as this IO is already cleanedup */
1380         if (test_and_set_bit(BNX2FC_FLAG_IO_CLEANUP,
1381                                 &io_req->req_flags))
1382                 goto io_compl;
1383
1384         /*
1385          * For ABTS issued due to SCSI eh_abort_handler, timeout
1386          * values are maintained by scsi-ml itself. Cancel timeout
1387          * in case ABTS issued as part of task management function
1388          * or due to FW error.
1389          */
1390         if (test_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags))
1391                 if (cancel_delayed_work(&io_req->timeout_work))
1392                         kref_put(&io_req->refcount,
1393                                  bnx2fc_cmd_release); /* drop timer hold */
1394
1395         r_ctl = (u8)task->rxwr_only.union_ctx.comp_info.abts_rsp.r_ctl;
1396
1397         switch (r_ctl) {
1398         case FC_RCTL_BA_ACC:
1399                 /*
1400                  * Dont release this cmd yet. It will be relesed
1401                  * after we get RRQ response
1402                  */
1403                 BNX2FC_IO_DBG(io_req, "ABTS response - ACC Send RRQ\n");
1404                 issue_rrq = 1;
1405                 break;
1406
1407         case FC_RCTL_BA_RJT:
1408                 BNX2FC_IO_DBG(io_req, "ABTS response - RJT\n");
1409                 break;
1410         default:
1411                 printk(KERN_ERR PFX "Unknown ABTS response\n");
1412                 break;
1413         }
1414
1415         if (issue_rrq) {
1416                 BNX2FC_IO_DBG(io_req, "Issue RRQ after R_A_TOV\n");
1417                 set_bit(BNX2FC_FLAG_ISSUE_RRQ, &io_req->req_flags);
1418         }
1419         set_bit(BNX2FC_FLAG_RETIRE_OXID, &io_req->req_flags);
1420         bnx2fc_cmd_timer_set(io_req, r_a_tov);
1421
1422 io_compl:
1423         if (io_req->wait_for_comp) {
1424                 if (test_and_clear_bit(BNX2FC_FLAG_EH_ABORT,
1425                                        &io_req->req_flags))
1426                         complete(&io_req->tm_done);
1427         } else {
1428                 /*
1429                  * We end up here when ABTS is issued as
1430                  * in asynchronous context, i.e., as part
1431                  * of task management completion, or
1432                  * when FW error is received or when the
1433                  * ABTS is issued when the IO is timed
1434                  * out.
1435                  */
1436
1437                 if (io_req->on_active_queue) {
1438                         list_del_init(&io_req->link);
1439                         io_req->on_active_queue = 0;
1440                         /* Move IO req to retire queue */
1441                         list_add_tail(&io_req->link, &tgt->io_retire_queue);
1442                 }
1443                 bnx2fc_scsi_done(io_req, DID_ERROR);
1444                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1445         }
1446 }
1447
1448 static void bnx2fc_lun_reset_cmpl(struct bnx2fc_cmd *io_req)
1449 {
1450         struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1451         struct bnx2fc_rport *tgt = io_req->tgt;
1452         struct bnx2fc_cmd *cmd, *tmp;
1453         int tm_lun = sc_cmd->device->lun;
1454         int rc = 0;
1455         int lun;
1456
1457         /* called with tgt_lock held */
1458         BNX2FC_IO_DBG(io_req, "Entered bnx2fc_lun_reset_cmpl\n");
1459         /*
1460          * Walk thru the active_ios queue and ABORT the IO
1461          * that matches with the LUN that was reset
1462          */
1463         list_for_each_entry_safe(cmd, tmp, &tgt->active_cmd_queue, link) {
1464                 BNX2FC_TGT_DBG(tgt, "LUN RST cmpl: scan for pending IOs\n");
1465                 lun = cmd->sc_cmd->device->lun;
1466                 if (lun == tm_lun) {
1467                         /* Initiate ABTS on this cmd */
1468                         if (!test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS,
1469                                               &cmd->req_flags)) {
1470                                 /* cancel the IO timeout */
1471                                 if (cancel_delayed_work(&io_req->timeout_work))
1472                                         kref_put(&io_req->refcount,
1473                                                  bnx2fc_cmd_release);
1474                                                         /* timer hold */
1475                                 rc = bnx2fc_initiate_abts(cmd);
1476                                 /* abts shouldn't fail in this context */
1477                                 WARN_ON(rc != SUCCESS);
1478                         } else
1479                                 printk(KERN_ERR PFX "lun_rst: abts already in"
1480                                         " progress for this IO 0x%x\n",
1481                                         cmd->xid);
1482                 }
1483         }
1484 }
1485
1486 static void bnx2fc_tgt_reset_cmpl(struct bnx2fc_cmd *io_req)
1487 {
1488         struct bnx2fc_rport *tgt = io_req->tgt;
1489         struct bnx2fc_cmd *cmd, *tmp;
1490         int rc = 0;
1491
1492         /* called with tgt_lock held */
1493         BNX2FC_IO_DBG(io_req, "Entered bnx2fc_tgt_reset_cmpl\n");
1494         /*
1495          * Walk thru the active_ios queue and ABORT the IO
1496          * that matches with the LUN that was reset
1497          */
1498         list_for_each_entry_safe(cmd, tmp, &tgt->active_cmd_queue, link) {
1499                 BNX2FC_TGT_DBG(tgt, "TGT RST cmpl: scan for pending IOs\n");
1500                 /* Initiate ABTS */
1501                 if (!test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS,
1502                                                         &cmd->req_flags)) {
1503                         /* cancel the IO timeout */
1504                         if (cancel_delayed_work(&io_req->timeout_work))
1505                                 kref_put(&io_req->refcount,
1506                                          bnx2fc_cmd_release); /* timer hold */
1507                         rc = bnx2fc_initiate_abts(cmd);
1508                         /* abts shouldn't fail in this context */
1509                         WARN_ON(rc != SUCCESS);
1510
1511                 } else
1512                         printk(KERN_ERR PFX "tgt_rst: abts already in progress"
1513                                 " for this IO 0x%x\n", cmd->xid);
1514         }
1515 }
1516
1517 void bnx2fc_process_tm_compl(struct bnx2fc_cmd *io_req,
1518                              struct fcoe_task_ctx_entry *task, u8 num_rq)
1519 {
1520         struct bnx2fc_mp_req *tm_req;
1521         struct fc_frame_header *fc_hdr;
1522         struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1523         u64 *hdr;
1524         u64 *temp_hdr;
1525         void *rsp_buf;
1526
1527         /* Called with tgt_lock held */
1528         BNX2FC_IO_DBG(io_req, "Entered process_tm_compl\n");
1529
1530         if (!(test_bit(BNX2FC_FLAG_TM_TIMEOUT, &io_req->req_flags)))
1531                 set_bit(BNX2FC_FLAG_TM_COMPL, &io_req->req_flags);
1532         else {
1533                 /* TM has already timed out and we got
1534                  * delayed completion. Ignore completion
1535                  * processing.
1536                  */
1537                 return;
1538         }
1539
1540         tm_req = &(io_req->mp_req);
1541         fc_hdr = &(tm_req->resp_fc_hdr);
1542         hdr = (u64 *)fc_hdr;
1543         temp_hdr = (u64 *)
1544                 &task->rxwr_only.union_ctx.comp_info.mp_rsp.fc_hdr;
1545         hdr[0] = cpu_to_be64(temp_hdr[0]);
1546         hdr[1] = cpu_to_be64(temp_hdr[1]);
1547         hdr[2] = cpu_to_be64(temp_hdr[2]);
1548
1549         tm_req->resp_len =
1550                 task->rxwr_only.union_ctx.comp_info.mp_rsp.mp_payload_len;
1551
1552         rsp_buf = tm_req->resp_buf;
1553
1554         if (fc_hdr->fh_r_ctl == FC_RCTL_DD_CMD_STATUS) {
1555                 bnx2fc_parse_fcp_rsp(io_req,
1556                                      (struct fcoe_fcp_rsp_payload *)
1557                                      rsp_buf, num_rq);
1558                 if (io_req->fcp_rsp_code == 0) {
1559                         /* TM successful */
1560                         if (tm_req->tm_flags & FCP_TMF_LUN_RESET)
1561                                 bnx2fc_lun_reset_cmpl(io_req);
1562                         else if (tm_req->tm_flags & FCP_TMF_TGT_RESET)
1563                                 bnx2fc_tgt_reset_cmpl(io_req);
1564                 }
1565         } else {
1566                 printk(KERN_ERR PFX "tmf's fc_hdr r_ctl = 0x%x\n",
1567                         fc_hdr->fh_r_ctl);
1568         }
1569         if (!sc_cmd->SCp.ptr) {
1570                 printk(KERN_ERR PFX "tm_compl: SCp.ptr is NULL\n");
1571                 return;
1572         }
1573         switch (io_req->fcp_status) {
1574         case FC_GOOD:
1575                 if (io_req->cdb_status == 0) {
1576                         /* Good IO completion */
1577                         sc_cmd->result = DID_OK << 16;
1578                 } else {
1579                         /* Transport status is good, SCSI status not good */
1580                         sc_cmd->result = (DID_OK << 16) | io_req->cdb_status;
1581                 }
1582                 if (io_req->fcp_resid)
1583                         scsi_set_resid(sc_cmd, io_req->fcp_resid);
1584                 break;
1585
1586         default:
1587                 BNX2FC_IO_DBG(io_req, "process_tm_compl: fcp_status = %d\n",
1588                            io_req->fcp_status);
1589                 break;
1590         }
1591
1592         sc_cmd = io_req->sc_cmd;
1593         io_req->sc_cmd = NULL;
1594
1595         /* check if the io_req exists in tgt's tmf_q */
1596         if (io_req->on_tmf_queue) {
1597
1598                 list_del_init(&io_req->link);
1599                 io_req->on_tmf_queue = 0;
1600         } else {
1601
1602                 printk(KERN_ERR PFX "Command not on active_cmd_queue!\n");
1603                 return;
1604         }
1605
1606         sc_cmd->SCp.ptr = NULL;
1607         sc_cmd->scsi_done(sc_cmd);
1608
1609         kref_put(&io_req->refcount, bnx2fc_cmd_release);
1610         if (io_req->wait_for_comp) {
1611                 BNX2FC_IO_DBG(io_req, "tm_compl - wake up the waiter\n");
1612                 complete(&io_req->tm_done);
1613         }
1614 }
1615
1616 static int bnx2fc_split_bd(struct bnx2fc_cmd *io_req, u64 addr, int sg_len,
1617                            int bd_index)
1618 {
1619         struct fcoe_bd_ctx *bd = io_req->bd_tbl->bd_tbl;
1620         int frag_size, sg_frags;
1621
1622         sg_frags = 0;
1623         while (sg_len) {
1624                 if (sg_len >= BNX2FC_BD_SPLIT_SZ)
1625                         frag_size = BNX2FC_BD_SPLIT_SZ;
1626                 else
1627                         frag_size = sg_len;
1628                 bd[bd_index + sg_frags].buf_addr_lo = addr & 0xffffffff;
1629                 bd[bd_index + sg_frags].buf_addr_hi  = addr >> 32;
1630                 bd[bd_index + sg_frags].buf_len = (u16)frag_size;
1631                 bd[bd_index + sg_frags].flags = 0;
1632
1633                 addr += (u64) frag_size;
1634                 sg_frags++;
1635                 sg_len -= frag_size;
1636         }
1637         return sg_frags;
1638
1639 }
1640
1641 static int bnx2fc_map_sg(struct bnx2fc_cmd *io_req)
1642 {
1643         struct bnx2fc_interface *interface = io_req->port->priv;
1644         struct bnx2fc_hba *hba = interface->hba;
1645         struct scsi_cmnd *sc = io_req->sc_cmd;
1646         struct fcoe_bd_ctx *bd = io_req->bd_tbl->bd_tbl;
1647         struct scatterlist *sg;
1648         int byte_count = 0;
1649         int sg_count = 0;
1650         int bd_count = 0;
1651         int sg_frags;
1652         unsigned int sg_len;
1653         u64 addr;
1654         int i;
1655
1656         sg_count = dma_map_sg(&hba->pcidev->dev, scsi_sglist(sc),
1657                               scsi_sg_count(sc), sc->sc_data_direction);
1658         scsi_for_each_sg(sc, sg, sg_count, i) {
1659                 sg_len = sg_dma_len(sg);
1660                 addr = sg_dma_address(sg);
1661                 if (sg_len > BNX2FC_MAX_BD_LEN) {
1662                         sg_frags = bnx2fc_split_bd(io_req, addr, sg_len,
1663                                                    bd_count);
1664                 } else {
1665
1666                         sg_frags = 1;
1667                         bd[bd_count].buf_addr_lo = addr & 0xffffffff;
1668                         bd[bd_count].buf_addr_hi  = addr >> 32;
1669                         bd[bd_count].buf_len = (u16)sg_len;
1670                         bd[bd_count].flags = 0;
1671                 }
1672                 bd_count += sg_frags;
1673                 byte_count += sg_len;
1674         }
1675         if (byte_count != scsi_bufflen(sc))
1676                 printk(KERN_ERR PFX "byte_count = %d != scsi_bufflen = %d, "
1677                         "task_id = 0x%x\n", byte_count, scsi_bufflen(sc),
1678                         io_req->xid);
1679         return bd_count;
1680 }
1681
1682 static int bnx2fc_build_bd_list_from_sg(struct bnx2fc_cmd *io_req)
1683 {
1684         struct scsi_cmnd *sc = io_req->sc_cmd;
1685         struct fcoe_bd_ctx *bd = io_req->bd_tbl->bd_tbl;
1686         int bd_count;
1687
1688         if (scsi_sg_count(sc)) {
1689                 bd_count = bnx2fc_map_sg(io_req);
1690                 if (bd_count == 0)
1691                         return -ENOMEM;
1692         } else {
1693                 bd_count = 0;
1694                 bd[0].buf_addr_lo = bd[0].buf_addr_hi = 0;
1695                 bd[0].buf_len = bd[0].flags = 0;
1696         }
1697         io_req->bd_tbl->bd_valid = bd_count;
1698
1699         return 0;
1700 }
1701
1702 static void bnx2fc_unmap_sg_list(struct bnx2fc_cmd *io_req)
1703 {
1704         struct scsi_cmnd *sc = io_req->sc_cmd;
1705
1706         if (io_req->bd_tbl->bd_valid && sc) {
1707                 scsi_dma_unmap(sc);
1708                 io_req->bd_tbl->bd_valid = 0;
1709         }
1710 }
1711
1712 void bnx2fc_build_fcp_cmnd(struct bnx2fc_cmd *io_req,
1713                                   struct fcp_cmnd *fcp_cmnd)
1714 {
1715         struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1716         char tag[2];
1717
1718         memset(fcp_cmnd, 0, sizeof(struct fcp_cmnd));
1719
1720         int_to_scsilun(sc_cmd->device->lun, &fcp_cmnd->fc_lun);
1721
1722         fcp_cmnd->fc_dl = htonl(io_req->data_xfer_len);
1723         memcpy(fcp_cmnd->fc_cdb, sc_cmd->cmnd, sc_cmd->cmd_len);
1724
1725         fcp_cmnd->fc_cmdref = 0;
1726         fcp_cmnd->fc_pri_ta = 0;
1727         fcp_cmnd->fc_tm_flags = io_req->mp_req.tm_flags;
1728         fcp_cmnd->fc_flags = io_req->io_req_flags;
1729
1730         if (scsi_populate_tag_msg(sc_cmd, tag)) {
1731                 switch (tag[0]) {
1732                 case HEAD_OF_QUEUE_TAG:
1733                         fcp_cmnd->fc_pri_ta = FCP_PTA_HEADQ;
1734                         break;
1735                 case ORDERED_QUEUE_TAG:
1736                         fcp_cmnd->fc_pri_ta = FCP_PTA_ORDERED;
1737                         break;
1738                 default:
1739                         fcp_cmnd->fc_pri_ta = FCP_PTA_SIMPLE;
1740                         break;
1741                 }
1742         } else {
1743                 fcp_cmnd->fc_pri_ta = 0;
1744         }
1745 }
1746
1747 static void bnx2fc_parse_fcp_rsp(struct bnx2fc_cmd *io_req,
1748                                  struct fcoe_fcp_rsp_payload *fcp_rsp,
1749                                  u8 num_rq)
1750 {
1751         struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1752         struct bnx2fc_rport *tgt = io_req->tgt;
1753         u8 rsp_flags = fcp_rsp->fcp_flags.flags;
1754         u32 rq_buff_len = 0;
1755         int i;
1756         unsigned char *rq_data;
1757         unsigned char *dummy;
1758         int fcp_sns_len = 0;
1759         int fcp_rsp_len = 0;
1760
1761         io_req->fcp_status = FC_GOOD;
1762         io_req->fcp_resid = fcp_rsp->fcp_resid;
1763
1764         io_req->scsi_comp_flags = rsp_flags;
1765         CMD_SCSI_STATUS(sc_cmd) = io_req->cdb_status =
1766                                 fcp_rsp->scsi_status_code;
1767
1768         /* Fetch fcp_rsp_info and fcp_sns_info if available */
1769         if (num_rq) {
1770
1771                 /*
1772                  * We do not anticipate num_rq >1, as the linux defined
1773                  * SCSI_SENSE_BUFFERSIZE is 96 bytes + 8 bytes of FCP_RSP_INFO
1774                  * 256 bytes of single rq buffer is good enough to hold this.
1775                  */
1776
1777                 if (rsp_flags &
1778                     FCOE_FCP_RSP_FLAGS_FCP_RSP_LEN_VALID) {
1779                         fcp_rsp_len = rq_buff_len
1780                                         = fcp_rsp->fcp_rsp_len;
1781                 }
1782
1783                 if (rsp_flags &
1784                     FCOE_FCP_RSP_FLAGS_FCP_SNS_LEN_VALID) {
1785                         fcp_sns_len = fcp_rsp->fcp_sns_len;
1786                         rq_buff_len += fcp_rsp->fcp_sns_len;
1787                 }
1788
1789                 io_req->fcp_rsp_len = fcp_rsp_len;
1790                 io_req->fcp_sns_len = fcp_sns_len;
1791
1792                 if (rq_buff_len > num_rq * BNX2FC_RQ_BUF_SZ) {
1793                         /* Invalid sense sense length. */
1794                         printk(KERN_ERR PFX "invalid sns length %d\n",
1795                                 rq_buff_len);
1796                         /* reset rq_buff_len */
1797                         rq_buff_len =  num_rq * BNX2FC_RQ_BUF_SZ;
1798                 }
1799
1800                 rq_data = bnx2fc_get_next_rqe(tgt, 1);
1801
1802                 if (num_rq > 1) {
1803                         /* We do not need extra sense data */
1804                         for (i = 1; i < num_rq; i++)
1805                                 dummy = bnx2fc_get_next_rqe(tgt, 1);
1806                 }
1807
1808                 /* fetch fcp_rsp_code */
1809                 if ((fcp_rsp_len == 4) || (fcp_rsp_len == 8)) {
1810                         /* Only for task management function */
1811                         io_req->fcp_rsp_code = rq_data[3];
1812                         printk(KERN_ERR PFX "fcp_rsp_code = %d\n",
1813                                 io_req->fcp_rsp_code);
1814                 }
1815
1816                 /* fetch sense data */
1817                 rq_data += fcp_rsp_len;
1818
1819                 if (fcp_sns_len > SCSI_SENSE_BUFFERSIZE) {
1820                         printk(KERN_ERR PFX "Truncating sense buffer\n");
1821                         fcp_sns_len = SCSI_SENSE_BUFFERSIZE;
1822                 }
1823
1824                 memset(sc_cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1825                 if (fcp_sns_len)
1826                         memcpy(sc_cmd->sense_buffer, rq_data, fcp_sns_len);
1827
1828                 /* return RQ entries */
1829                 for (i = 0; i < num_rq; i++)
1830                         bnx2fc_return_rqe(tgt, 1);
1831         }
1832 }
1833
1834 /**
1835  * bnx2fc_queuecommand - Queuecommand function of the scsi template
1836  *
1837  * @host:       The Scsi_Host the command was issued to
1838  * @sc_cmd:     struct scsi_cmnd to be executed
1839  *
1840  * This is the IO strategy routine, called by SCSI-ML
1841  **/
1842 int bnx2fc_queuecommand(struct Scsi_Host *host,
1843                         struct scsi_cmnd *sc_cmd)
1844 {
1845         struct fc_lport *lport = shost_priv(host);
1846         struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
1847         struct fc_rport_libfc_priv *rp = rport->dd_data;
1848         struct bnx2fc_rport *tgt;
1849         struct bnx2fc_cmd *io_req;
1850         int rc = 0;
1851         int rval;
1852
1853         rval = fc_remote_port_chkready(rport);
1854         if (rval) {
1855                 sc_cmd->result = rval;
1856                 sc_cmd->scsi_done(sc_cmd);
1857                 return 0;
1858         }
1859
1860         if ((lport->state != LPORT_ST_READY) || !(lport->link_up)) {
1861                 rc = SCSI_MLQUEUE_HOST_BUSY;
1862                 goto exit_qcmd;
1863         }
1864
1865         /* rport and tgt are allocated together, so tgt should be non-NULL */
1866         tgt = (struct bnx2fc_rport *)&rp[1];
1867
1868         if (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags)) {
1869                 /*
1870                  * Session is not offloaded yet. Let SCSI-ml retry
1871                  * the command.
1872                  */
1873                 rc = SCSI_MLQUEUE_TARGET_BUSY;
1874                 goto exit_qcmd;
1875         }
1876         if (tgt->retry_delay_timestamp) {
1877                 if (time_after(jiffies, tgt->retry_delay_timestamp)) {
1878                         tgt->retry_delay_timestamp = 0;
1879                 } else {
1880                         /* If retry_delay timer is active, flow off the ML */
1881                         rc = SCSI_MLQUEUE_TARGET_BUSY;
1882                         goto exit_qcmd;
1883                 }
1884         }
1885         io_req = bnx2fc_cmd_alloc(tgt);
1886         if (!io_req) {
1887                 rc = SCSI_MLQUEUE_HOST_BUSY;
1888                 goto exit_qcmd;
1889         }
1890         io_req->sc_cmd = sc_cmd;
1891
1892         if (bnx2fc_post_io_req(tgt, io_req)) {
1893                 printk(KERN_ERR PFX "Unable to post io_req\n");
1894                 rc = SCSI_MLQUEUE_HOST_BUSY;
1895                 goto exit_qcmd;
1896         }
1897 exit_qcmd:
1898         return rc;
1899 }
1900
1901 void bnx2fc_process_scsi_cmd_compl(struct bnx2fc_cmd *io_req,
1902                                    struct fcoe_task_ctx_entry *task,
1903                                    u8 num_rq)
1904 {
1905         struct fcoe_fcp_rsp_payload *fcp_rsp;
1906         struct bnx2fc_rport *tgt = io_req->tgt;
1907         struct scsi_cmnd *sc_cmd;
1908         struct Scsi_Host *host;
1909
1910
1911         /* scsi_cmd_cmpl is called with tgt lock held */
1912
1913         if (test_and_set_bit(BNX2FC_FLAG_IO_COMPL, &io_req->req_flags)) {
1914                 /* we will not receive ABTS response for this IO */
1915                 BNX2FC_IO_DBG(io_req, "Timer context finished processing "
1916                            "this scsi cmd\n");
1917         }
1918
1919         /* Cancel the timeout_work, as we received IO completion */
1920         if (cancel_delayed_work(&io_req->timeout_work))
1921                 kref_put(&io_req->refcount,
1922                          bnx2fc_cmd_release); /* drop timer hold */
1923
1924         sc_cmd = io_req->sc_cmd;
1925         if (sc_cmd == NULL) {
1926                 printk(KERN_ERR PFX "scsi_cmd_compl - sc_cmd is NULL\n");
1927                 return;
1928         }
1929
1930         /* Fetch fcp_rsp from task context and perform cmd completion */
1931         fcp_rsp = (struct fcoe_fcp_rsp_payload *)
1932                    &(task->rxwr_only.union_ctx.comp_info.fcp_rsp.payload);
1933
1934         /* parse fcp_rsp and obtain sense data from RQ if available */
1935         bnx2fc_parse_fcp_rsp(io_req, fcp_rsp, num_rq);
1936
1937         host = sc_cmd->device->host;
1938         if (!sc_cmd->SCp.ptr) {
1939                 printk(KERN_ERR PFX "SCp.ptr is NULL\n");
1940                 return;
1941         }
1942
1943         if (io_req->on_active_queue) {
1944                 list_del_init(&io_req->link);
1945                 io_req->on_active_queue = 0;
1946                 /* Move IO req to retire queue */
1947                 list_add_tail(&io_req->link, &tgt->io_retire_queue);
1948         } else {
1949                 /* This should not happen, but could have been pulled
1950                  * by bnx2fc_flush_active_ios(), or during a race
1951                  * between command abort and (late) completion.
1952                  */
1953                 BNX2FC_IO_DBG(io_req, "xid not on active_cmd_queue\n");
1954                 if (io_req->wait_for_comp)
1955                         if (test_and_clear_bit(BNX2FC_FLAG_EH_ABORT,
1956                                                &io_req->req_flags))
1957                                 complete(&io_req->tm_done);
1958         }
1959
1960         bnx2fc_unmap_sg_list(io_req);
1961         io_req->sc_cmd = NULL;
1962
1963         switch (io_req->fcp_status) {
1964         case FC_GOOD:
1965                 if (io_req->cdb_status == 0) {
1966                         /* Good IO completion */
1967                         sc_cmd->result = DID_OK << 16;
1968                 } else {
1969                         /* Transport status is good, SCSI status not good */
1970                         BNX2FC_IO_DBG(io_req, "scsi_cmpl: cdb_status = %d"
1971                                  " fcp_resid = 0x%x\n",
1972                                 io_req->cdb_status, io_req->fcp_resid);
1973                         sc_cmd->result = (DID_OK << 16) | io_req->cdb_status;
1974
1975                         if (io_req->cdb_status == SAM_STAT_TASK_SET_FULL ||
1976                             io_req->cdb_status == SAM_STAT_BUSY) {
1977                                 /* Set the jiffies + retry_delay_timer * 100ms
1978                                    for the rport/tgt */
1979                                 tgt->retry_delay_timestamp = jiffies +
1980                                         fcp_rsp->retry_delay_timer * HZ / 10;
1981                         }
1982
1983                 }
1984                 if (io_req->fcp_resid)
1985                         scsi_set_resid(sc_cmd, io_req->fcp_resid);
1986                 break;
1987         default:
1988                 printk(KERN_ERR PFX "scsi_cmd_compl: fcp_status = %d\n",
1989                         io_req->fcp_status);
1990                 break;
1991         }
1992         sc_cmd->SCp.ptr = NULL;
1993         sc_cmd->scsi_done(sc_cmd);
1994         kref_put(&io_req->refcount, bnx2fc_cmd_release);
1995 }
1996
1997 int bnx2fc_post_io_req(struct bnx2fc_rport *tgt,
1998                                struct bnx2fc_cmd *io_req)
1999 {
2000         struct fcoe_task_ctx_entry *task;
2001         struct fcoe_task_ctx_entry *task_page;
2002         struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
2003         struct fcoe_port *port = tgt->port;
2004         struct bnx2fc_interface *interface = port->priv;
2005         struct bnx2fc_hba *hba = interface->hba;
2006         struct fc_lport *lport = port->lport;
2007         struct fc_stats *stats;
2008         int task_idx, index;
2009         u16 xid;
2010
2011         /* Initialize rest of io_req fields */
2012         io_req->cmd_type = BNX2FC_SCSI_CMD;
2013         io_req->port = port;
2014         io_req->tgt = tgt;
2015         io_req->data_xfer_len = scsi_bufflen(sc_cmd);
2016         sc_cmd->SCp.ptr = (char *)io_req;
2017
2018         stats = per_cpu_ptr(lport->stats, get_cpu());
2019         if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE) {
2020                 io_req->io_req_flags = BNX2FC_READ;
2021                 stats->InputRequests++;
2022                 stats->InputBytes += io_req->data_xfer_len;
2023         } else if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) {
2024                 io_req->io_req_flags = BNX2FC_WRITE;
2025                 stats->OutputRequests++;
2026                 stats->OutputBytes += io_req->data_xfer_len;
2027         } else {
2028                 io_req->io_req_flags = 0;
2029                 stats->ControlRequests++;
2030         }
2031         put_cpu();
2032
2033         xid = io_req->xid;
2034
2035         /* Build buffer descriptor list for firmware from sg list */
2036         if (bnx2fc_build_bd_list_from_sg(io_req)) {
2037                 printk(KERN_ERR PFX "BD list creation failed\n");
2038                 spin_lock_bh(&tgt->tgt_lock);
2039                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
2040                 spin_unlock_bh(&tgt->tgt_lock);
2041                 return -EAGAIN;
2042         }
2043
2044         task_idx = xid / BNX2FC_TASKS_PER_PAGE;
2045         index = xid % BNX2FC_TASKS_PER_PAGE;
2046
2047         /* Initialize task context for this IO request */
2048         task_page = (struct fcoe_task_ctx_entry *) hba->task_ctx[task_idx];
2049         task = &(task_page[index]);
2050         bnx2fc_init_task(io_req, task);
2051
2052         spin_lock_bh(&tgt->tgt_lock);
2053
2054         if (tgt->flush_in_prog) {
2055                 printk(KERN_ERR PFX "Flush in progress..Host Busy\n");
2056                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
2057                 spin_unlock_bh(&tgt->tgt_lock);
2058                 return -EAGAIN;
2059         }
2060
2061         if (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags)) {
2062                 printk(KERN_ERR PFX "Session not ready...post_io\n");
2063                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
2064                 spin_unlock_bh(&tgt->tgt_lock);
2065                 return -EAGAIN;
2066         }
2067
2068         /* Time IO req */
2069         if (tgt->io_timeout)
2070                 bnx2fc_cmd_timer_set(io_req, BNX2FC_IO_TIMEOUT);
2071         /* Obtain free SQ entry */
2072         bnx2fc_add_2_sq(tgt, xid);
2073
2074         /* Enqueue the io_req to active_cmd_queue */
2075
2076         io_req->on_active_queue = 1;
2077         /* move io_req from pending_queue to active_queue */
2078         list_add_tail(&io_req->link, &tgt->active_cmd_queue);
2079
2080         /* Ring doorbell */
2081         bnx2fc_ring_doorbell(tgt);
2082         spin_unlock_bh(&tgt->tgt_lock);
2083         return 0;
2084 }