kernel/drivers/scsi/bnx2fc/bnx2fc_io.c

   1 /* bnx2fc_io.c: QLogic NetXtreme II Linux FCoE offload driver.
   2  * IO manager and SCSI IO processing.
   3  *
   4  * Copyright (c) 2008 - 2013 Broadcom Corporation
   5  * Copyright (c) 2014, QLogic Corporation
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation.
  10  *
  11  * Written by: Bhanu Prakash Gollapudi (bprakash@broadcom.com)
  12  */
  13
  14 #include "bnx2fc.h"
  15
  16 #define RESERVE_FREE_LIST_INDEX num_possible_cpus()
  17
  18 static int bnx2fc_split_bd(struct bnx2fc_cmd *io_req, u64 addr, int sg_len,
  19                            int bd_index);
  20 static int bnx2fc_map_sg(struct bnx2fc_cmd *io_req);
  21 static int bnx2fc_build_bd_list_from_sg(struct bnx2fc_cmd *io_req);
  22 static void bnx2fc_unmap_sg_list(struct bnx2fc_cmd *io_req);
  23 static void bnx2fc_free_mp_resc(struct bnx2fc_cmd *io_req);
  24 static void bnx2fc_parse_fcp_rsp(struct bnx2fc_cmd *io_req,
  25                                  struct fcoe_fcp_rsp_payload *fcp_rsp,
  26                                  u8 num_rq);
  27
  28 void bnx2fc_cmd_timer_set(struct bnx2fc_cmd *io_req,
  29                           unsigned int timer_msec)
  30 {
  31         struct bnx2fc_interface *interface = io_req->port->priv;
  32
  33         if (queue_delayed_work(interface->timer_work_queue,
  34                                &io_req->timeout_work,
  35                                msecs_to_jiffies(timer_msec)))
  36                 kref_get(&io_req->refcount);
  37 }
  38
  39 static void bnx2fc_cmd_timeout(struct work_struct *work)
  40 {
  41         struct bnx2fc_cmd *io_req = container_of(work, struct bnx2fc_cmd,
  42                                                  timeout_work.work);
  43         struct fc_lport *lport;
  44         struct fc_rport_priv *rdata;
  45         u8 cmd_type = io_req->cmd_type;
  46         struct bnx2fc_rport *tgt = io_req->tgt;
  47         int logo_issued;
  48         int rc;
  49
  50         BNX2FC_IO_DBG(io_req, "cmd_timeout, cmd_type = %d,"
  51                       "req_flags = %lx\n", cmd_type, io_req->req_flags);
  52
  53         spin_lock_bh(&tgt->tgt_lock);
  54         if (test_and_clear_bit(BNX2FC_FLAG_ISSUE_RRQ, &io_req->req_flags)) {
  55                 clear_bit(BNX2FC_FLAG_RETIRE_OXID, &io_req->req_flags);
  56                 /*
  57                  * ideally we should hold the io_req until RRQ complets,
  58                  * and release io_req from timeout hold.
  59                  */
  60                 spin_unlock_bh(&tgt->tgt_lock);
  61                 bnx2fc_send_rrq(io_req);
  62                 return;
  63         }
  64         if (test_and_clear_bit(BNX2FC_FLAG_RETIRE_OXID, &io_req->req_flags)) {
  65                 BNX2FC_IO_DBG(io_req, "IO ready for reuse now\n");
  66                 goto done;
  67         }
  68
  69         switch (cmd_type) {
  70         case BNX2FC_SCSI_CMD:
  71                 if (test_and_clear_bit(BNX2FC_FLAG_EH_ABORT,
  72                                                         &io_req->req_flags)) {
  73                         /* Handle eh_abort timeout */
  74                         BNX2FC_IO_DBG(io_req, "eh_abort timed out\n");
  75                         complete(&io_req->tm_done);
  76                 } else if (test_bit(BNX2FC_FLAG_ISSUE_ABTS,
  77                                     &io_req->req_flags)) {
  78                         /* Handle internally generated ABTS timeout */
  79                         BNX2FC_IO_DBG(io_req, "ABTS timed out refcnt = %d\n",
  80                                         io_req->refcount.refcount.counter);
  81                         if (!(test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
  82                                                &io_req->req_flags))) {
  83
  84                                 lport = io_req->port->lport;
  85                                 rdata = io_req->tgt->rdata;
  86                                 logo_issued = test_and_set_bit(
  87                                                 BNX2FC_FLAG_EXPL_LOGO,
  88                                                 &tgt->flags);
  89                                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
  90                                 spin_unlock_bh(&tgt->tgt_lock);
  91
  92                                 /* Explicitly logo the target */
  93                                 if (!logo_issued) {
  94                                         BNX2FC_IO_DBG(io_req, "Explicit "
  95                                                    "logo - tgt flags = 0x%lx\n",
  96                                                    tgt->flags);
  97
  98                                         mutex_lock(&lport->disc.disc_mutex);
  99                                         lport->tt.rport_logoff(rdata);
 100                                         mutex_unlock(&lport->disc.disc_mutex);
 101                                 }
 102                                 return;
 103                         }
 104                 } else {
 105                         /* Hanlde IO timeout */
 106                         BNX2FC_IO_DBG(io_req, "IO timed out. issue ABTS\n");
 107                         if (test_and_set_bit(BNX2FC_FLAG_IO_COMPL,
 108                                              &io_req->req_flags)) {
 109                                 BNX2FC_IO_DBG(io_req, "IO completed before "
 110                                                            " timer expiry\n");
 111                                 goto done;
 112                         }
 113
 114                         if (!test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS,
 115                                               &io_req->req_flags)) {
 116                                 rc = bnx2fc_initiate_abts(io_req);
 117                                 if (rc == SUCCESS)
 118                                         goto done;
 119                                 /*
 120                                  * Explicitly logo the target if
 121                                  * abts initiation fails
 122                                  */
 123                                 lport = io_req->port->lport;
 124                                 rdata = io_req->tgt->rdata;
 125                                 logo_issued = test_and_set_bit(
 126                                                 BNX2FC_FLAG_EXPL_LOGO,
 127                                                 &tgt->flags);
 128                                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
 129                                 spin_unlock_bh(&tgt->tgt_lock);
 130
 131                                 if (!logo_issued) {
 132                                         BNX2FC_IO_DBG(io_req, "Explicit "
 133                                                    "logo - tgt flags = 0x%lx\n",
 134                                                    tgt->flags);
 135
 136
 137                                         mutex_lock(&lport->disc.disc_mutex);
 138                                         lport->tt.rport_logoff(rdata);
 139                                         mutex_unlock(&lport->disc.disc_mutex);
 140                                 }
 141                                 return;
 142                         } else {
 143                                 BNX2FC_IO_DBG(io_req, "IO already in "
 144                                                       "ABTS processing\n");
 145                         }
 146                 }
 147                 break;
 148         case BNX2FC_ELS:
 149
 150                 if (test_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags)) {
 151                         BNX2FC_IO_DBG(io_req, "ABTS for ELS timed out\n");
 152
 153                         if (!test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
 154                                               &io_req->req_flags)) {
 155                                 lport = io_req->port->lport;
 156                                 rdata = io_req->tgt->rdata;
 157                                 logo_issued = test_and_set_bit(
 158                                                 BNX2FC_FLAG_EXPL_LOGO,
 159                                                 &tgt->flags);
 160                                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
 161                                 spin_unlock_bh(&tgt->tgt_lock);
 162
 163                                 /* Explicitly logo the target */
 164                                 if (!logo_issued) {
 165                                         BNX2FC_IO_DBG(io_req, "Explicitly logo"
 166                                                    "(els)\n");
 167                                         mutex_lock(&lport->disc.disc_mutex);
 168                                         lport->tt.rport_logoff(rdata);
 169                                         mutex_unlock(&lport->disc.disc_mutex);
 170                                 }
 171                                 return;
 172                         }
 173                 } else {
 174                         /*
 175                          * Handle ELS timeout.
 176                          * tgt_lock is used to sync compl path and timeout
 177                          * path. If els compl path is processing this IO, we
 178                          * have nothing to do here, just release the timer hold
 179                          */
 180                         BNX2FC_IO_DBG(io_req, "ELS timed out\n");
 181                         if (test_and_set_bit(BNX2FC_FLAG_ELS_DONE,
 182                                                &io_req->req_flags))
 183                                 goto done;
 184
 185                         /* Indicate the cb_func that this ELS is timed out */
 186                         set_bit(BNX2FC_FLAG_ELS_TIMEOUT, &io_req->req_flags);
 187
 188                         if ((io_req->cb_func) && (io_req->cb_arg)) {
 189                                 io_req->cb_func(io_req->cb_arg);
 190                                 io_req->cb_arg = NULL;
 191                         }
 192                 }
 193                 break;
 194         default:
 195                 printk(KERN_ERR PFX "cmd_timeout: invalid cmd_type %d\n",
 196                         cmd_type);
 197                 break;
 198         }
 199
 200 done:
 201         /* release the cmd that was held when timer was set */
 202         kref_put(&io_req->refcount, bnx2fc_cmd_release);
 203         spin_unlock_bh(&tgt->tgt_lock);
 204 }
 205
 206 static void bnx2fc_scsi_done(struct bnx2fc_cmd *io_req, int err_code)
 207 {
 208         /* Called with host lock held */
 209         struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
 210
 211         /*
 212          * active_cmd_queue may have other command types as well,
 213          * and during flush operation,  we want to error back only
 214          * scsi commands.
 215          */
 216         if (io_req->cmd_type != BNX2FC_SCSI_CMD)
 217                 return;
 218
 219         BNX2FC_IO_DBG(io_req, "scsi_done. err_code = 0x%x\n", err_code);
 220         if (test_bit(BNX2FC_FLAG_CMD_LOST, &io_req->req_flags)) {
 221                 /* Do not call scsi done for this IO */
 222                 return;
 223         }
 224
 225         bnx2fc_unmap_sg_list(io_req);
 226         io_req->sc_cmd = NULL;
 227         if (!sc_cmd) {
 228                 printk(KERN_ERR PFX "scsi_done - sc_cmd NULL. "
 229                                     "IO(0x%x) already cleaned up\n",
 230                        io_req->xid);
 231                 return;
 232         }
 233         sc_cmd->result = err_code << 16;
 234
 235         BNX2FC_IO_DBG(io_req, "sc=%p, result=0x%x, retries=%d, allowed=%d\n",
 236                 sc_cmd, host_byte(sc_cmd->result), sc_cmd->retries,
 237                 sc_cmd->allowed);
 238         scsi_set_resid(sc_cmd, scsi_bufflen(sc_cmd));
 239         sc_cmd->SCp.ptr = NULL;
 240         sc_cmd->scsi_done(sc_cmd);
 241 }
 242
 243 struct bnx2fc_cmd_mgr *bnx2fc_cmd_mgr_alloc(struct bnx2fc_hba *hba)
 244 {
 245         struct bnx2fc_cmd_mgr *cmgr;
 246         struct io_bdt *bdt_info;
 247         struct bnx2fc_cmd *io_req;
 248         size_t len;
 249         u32 mem_size;
 250         u16 xid;
 251         int i;
 252         int num_ios, num_pri_ios;
 253         size_t bd_tbl_sz;
 254         int arr_sz = num_possible_cpus() + 1;
 255         u16 min_xid = BNX2FC_MIN_XID;
 256         u16 max_xid = hba->max_xid;
 257
 258         if (max_xid <= min_xid || max_xid == FC_XID_UNKNOWN) {
 259                 printk(KERN_ERR PFX "cmd_mgr_alloc: Invalid min_xid 0x%x \
 260                                         and max_xid 0x%x\n", min_xid, max_xid);
 261                 return NULL;
 262         }
 263         BNX2FC_MISC_DBG("min xid 0x%x, max xid 0x%x\n", min_xid, max_xid);
 264
 265         num_ios = max_xid - min_xid + 1;
 266         len = (num_ios * (sizeof(struct bnx2fc_cmd *)));
 267         len += sizeof(struct bnx2fc_cmd_mgr);
 268
 269         cmgr = kzalloc(len, GFP_KERNEL);
 270         if (!cmgr) {
 271                 printk(KERN_ERR PFX "failed to alloc cmgr\n");
 272                 return NULL;
 273         }
 274
 275         cmgr->free_list = kzalloc(sizeof(*cmgr->free_list) *
 276                                   arr_sz, GFP_KERNEL);
 277         if (!cmgr->free_list) {
 278                 printk(KERN_ERR PFX "failed to alloc free_list\n");
 279                 goto mem_err;
 280         }
 281
 282         cmgr->free_list_lock = kzalloc(sizeof(*cmgr->free_list_lock) *
 283                                        arr_sz, GFP_KERNEL);
 284         if (!cmgr->free_list_lock) {
 285                 printk(KERN_ERR PFX "failed to alloc free_list_lock\n");
 286                 kfree(cmgr->free_list);
 287                 cmgr->free_list = NULL;
 288                 goto mem_err;
 289         }
 290
 291         cmgr->hba = hba;
 292         cmgr->cmds = (struct bnx2fc_cmd **)(cmgr + 1);
 293
 294         for (i = 0; i < arr_sz; i++)  {
 295                 INIT_LIST_HEAD(&cmgr->free_list[i]);
 296                 spin_lock_init(&cmgr->free_list_lock[i]);
 297         }
 298
 299         /*
 300          * Pre-allocated pool of bnx2fc_cmds.
 301          * Last entry in the free list array is the free list
 302          * of slow path requests.
 303          */
 304         xid = BNX2FC_MIN_XID;
 305         num_pri_ios = num_ios - hba->elstm_xids;
 306         for (i = 0; i < num_ios; i++) {
 307                 io_req = kzalloc(sizeof(*io_req), GFP_KERNEL);
 308
 309                 if (!io_req) {
 310                         printk(KERN_ERR PFX "failed to alloc io_req\n");
 311                         goto mem_err;
 312                 }
 313
 314                 INIT_LIST_HEAD(&io_req->link);
 315                 INIT_DELAYED_WORK(&io_req->timeout_work, bnx2fc_cmd_timeout);
 316
 317                 io_req->xid = xid++;
 318                 if (i < num_pri_ios)
 319                         list_add_tail(&io_req->link,
 320                                 &cmgr->free_list[io_req->xid %
 321                                                  num_possible_cpus()]);
 322                 else
 323                         list_add_tail(&io_req->link,
 324                                 &cmgr->free_list[num_possible_cpus()]);
 325                 io_req++;
 326         }
 327
 328         /* Allocate pool of io_bdts - one for each bnx2fc_cmd */
 329         mem_size = num_ios * sizeof(struct io_bdt *);
 330         cmgr->io_bdt_pool = kmalloc(mem_size, GFP_KERNEL);
 331         if (!cmgr->io_bdt_pool) {
 332                 printk(KERN_ERR PFX "failed to alloc io_bdt_pool\n");
 333                 goto mem_err;
 334         }
 335
 336         mem_size = sizeof(struct io_bdt);
 337         for (i = 0; i < num_ios; i++) {
 338                 cmgr->io_bdt_pool[i] = kmalloc(mem_size, GFP_KERNEL);
 339                 if (!cmgr->io_bdt_pool[i]) {
 340                         printk(KERN_ERR PFX "failed to alloc "
 341                                 "io_bdt_pool[%d]\n", i);
 342                         goto mem_err;
 343                 }
 344         }
 345
 346         /* Allocate an map fcoe_bdt_ctx structures */
 347         bd_tbl_sz = BNX2FC_MAX_BDS_PER_CMD * sizeof(struct fcoe_bd_ctx);
 348         for (i = 0; i < num_ios; i++) {
 349                 bdt_info = cmgr->io_bdt_pool[i];
 350                 bdt_info->bd_tbl = dma_alloc_coherent(&hba->pcidev->dev,
 351                                                       bd_tbl_sz,
 352                                                       &bdt_info->bd_tbl_dma,
 353                                                       GFP_KERNEL);
 354                 if (!bdt_info->bd_tbl) {
 355                         printk(KERN_ERR PFX "failed to alloc "
 356                                 "bdt_tbl[%d]\n", i);
 357                         goto mem_err;
 358                 }
 359         }
 360
 361         return cmgr;
 362
 363 mem_err:
 364         bnx2fc_cmd_mgr_free(cmgr);
 365         return NULL;
 366 }
 367
 368 void bnx2fc_cmd_mgr_free(struct bnx2fc_cmd_mgr *cmgr)
 369 {
 370         struct io_bdt *bdt_info;
 371         struct bnx2fc_hba *hba = cmgr->hba;
 372         size_t bd_tbl_sz;
 373         u16 min_xid = BNX2FC_MIN_XID;
 374         u16 max_xid = hba->max_xid;
 375         int num_ios;
 376         int i;
 377
 378         num_ios = max_xid - min_xid + 1;
 379
 380         /* Free fcoe_bdt_ctx structures */
 381         if (!cmgr->io_bdt_pool)
 382                 goto free_cmd_pool;
 383
 384         bd_tbl_sz = BNX2FC_MAX_BDS_PER_CMD * sizeof(struct fcoe_bd_ctx);
 385         for (i = 0; i < num_ios; i++) {
 386                 bdt_info = cmgr->io_bdt_pool[i];
 387                 if (bdt_info->bd_tbl) {
 388                         dma_free_coherent(&hba->pcidev->dev, bd_tbl_sz,
 389                                             bdt_info->bd_tbl,
 390                                             bdt_info->bd_tbl_dma);
 391                         bdt_info->bd_tbl = NULL;
 392                 }
 393         }
 394
 395         /* Destroy io_bdt pool */
 396         for (i = 0; i < num_ios; i++) {
 397                 kfree(cmgr->io_bdt_pool[i]);
 398                 cmgr->io_bdt_pool[i] = NULL;
 399         }
 400
 401         kfree(cmgr->io_bdt_pool);
 402         cmgr->io_bdt_pool = NULL;
 403
 404 free_cmd_pool:
 405         kfree(cmgr->free_list_lock);
 406
 407         /* Destroy cmd pool */
 408         if (!cmgr->free_list)
 409                 goto free_cmgr;
 410
 411         for (i = 0; i < num_possible_cpus() + 1; i++)  {
 412                 struct bnx2fc_cmd *tmp, *io_req;
 413
 414                 list_for_each_entry_safe(io_req, tmp,
 415                                          &cmgr->free_list[i], link) {
 416                         list_del(&io_req->link);
 417                         kfree(io_req);
 418                 }
 419         }
 420         kfree(cmgr->free_list);
 421 free_cmgr:
 422         /* Free command manager itself */
 423         kfree(cmgr);
 424 }
 425
 426 struct bnx2fc_cmd *bnx2fc_elstm_alloc(struct bnx2fc_rport *tgt, int type)
 427 {
 428         struct fcoe_port *port = tgt->port;
 429         struct bnx2fc_interface *interface = port->priv;
 430         struct bnx2fc_cmd_mgr *cmd_mgr = interface->hba->cmd_mgr;
 431         struct bnx2fc_cmd *io_req;
 432         struct list_head *listp;
 433         struct io_bdt *bd_tbl;
 434         int index = RESERVE_FREE_LIST_INDEX;
 435         u32 free_sqes;
 436         u32 max_sqes;
 437         u16 xid;
 438
 439         max_sqes = tgt->max_sqes;
 440         switch (type) {
 441         case BNX2FC_TASK_MGMT_CMD:
 442                 max_sqes = BNX2FC_TM_MAX_SQES;
 443                 break;
 444         case BNX2FC_ELS:
 445                 max_sqes = BNX2FC_ELS_MAX_SQES;
 446                 break;
 447         default:
 448                 break;
 449         }
 450
 451         /*
 452          * NOTE: Free list insertions and deletions are protected with
 453          * cmgr lock
 454          */
 455         spin_lock_bh(&cmd_mgr->free_list_lock[index]);
 456         free_sqes = atomic_read(&tgt->free_sqes);
 457         if ((list_empty(&(cmd_mgr->free_list[index]))) ||
 458             (tgt->num_active_ios.counter  >= max_sqes) ||
 459             (free_sqes + max_sqes <= BNX2FC_SQ_WQES_MAX)) {
 460                 BNX2FC_TGT_DBG(tgt, "No free els_tm cmds available "
 461                         "ios(%d):sqes(%d)\n",
 462                         tgt->num_active_ios.counter, tgt->max_sqes);
 463                 if (list_empty(&(cmd_mgr->free_list[index])))
 464                         printk(KERN_ERR PFX "elstm_alloc: list_empty\n");
 465                 spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
 466                 return NULL;
 467         }
 468
 469         listp = (struct list_head *)
 470                         cmd_mgr->free_list[index].next;
 471         list_del_init(listp);
 472         io_req = (struct bnx2fc_cmd *) listp;
 473         xid = io_req->xid;
 474         cmd_mgr->cmds[xid] = io_req;
 475         atomic_inc(&tgt->num_active_ios);
 476         atomic_dec(&tgt->free_sqes);
 477         spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
 478
 479         INIT_LIST_HEAD(&io_req->link);
 480
 481         io_req->port = port;
 482         io_req->cmd_mgr = cmd_mgr;
 483         io_req->req_flags = 0;
 484         io_req->cmd_type = type;
 485
 486         /* Bind io_bdt for this io_req */
 487         /* Have a static link between io_req and io_bdt_pool */
 488         bd_tbl = io_req->bd_tbl = cmd_mgr->io_bdt_pool[xid];
 489         bd_tbl->io_req = io_req;
 490
 491         /* Hold the io_req  against deletion */
 492         kref_init(&io_req->refcount);
 493         return io_req;
 494 }
 495
 496 struct bnx2fc_cmd *bnx2fc_cmd_alloc(struct bnx2fc_rport *tgt)
 497 {
 498         struct fcoe_port *port = tgt->port;
 499         struct bnx2fc_interface *interface = port->priv;
 500         struct bnx2fc_cmd_mgr *cmd_mgr = interface->hba->cmd_mgr;
 501         struct bnx2fc_cmd *io_req;
 502         struct list_head *listp;
 503         struct io_bdt *bd_tbl;
 504         u32 free_sqes;
 505         u32 max_sqes;
 506         u16 xid;
 507         int index = get_cpu();
 508
 509         max_sqes = BNX2FC_SCSI_MAX_SQES;
 510         /*
 511          * NOTE: Free list insertions and deletions are protected with
 512          * cmgr lock
 513          */
 514         spin_lock_bh(&cmd_mgr->free_list_lock[index]);
 515         free_sqes = atomic_read(&tgt->free_sqes);
 516         if ((list_empty(&cmd_mgr->free_list[index])) ||
 517             (tgt->num_active_ios.counter  >= max_sqes) ||
 518             (free_sqes + max_sqes <= BNX2FC_SQ_WQES_MAX)) {
 519                 spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
 520                 put_cpu();
 521                 return NULL;
 522         }
 523
 524         listp = (struct list_head *)
 525                 cmd_mgr->free_list[index].next;
 526         list_del_init(listp);
 527         io_req = (struct bnx2fc_cmd *) listp;
 528         xid = io_req->xid;
 529         cmd_mgr->cmds[xid] = io_req;
 530         atomic_inc(&tgt->num_active_ios);
 531         atomic_dec(&tgt->free_sqes);
 532         spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
 533         put_cpu();
 534
 535         INIT_LIST_HEAD(&io_req->link);
 536
 537         io_req->port = port;
 538         io_req->cmd_mgr = cmd_mgr;
 539         io_req->req_flags = 0;
 540
 541         /* Bind io_bdt for this io_req */
 542         /* Have a static link between io_req and io_bdt_pool */
 543         bd_tbl = io_req->bd_tbl = cmd_mgr->io_bdt_pool[xid];
 544         bd_tbl->io_req = io_req;
 545
 546         /* Hold the io_req  against deletion */
 547         kref_init(&io_req->refcount);
 548         return io_req;
 549 }
 550
 551 void bnx2fc_cmd_release(struct kref *ref)
 552 {
 553         struct bnx2fc_cmd *io_req = container_of(ref,
 554                                                 struct bnx2fc_cmd, refcount);
 555         struct bnx2fc_cmd_mgr *cmd_mgr = io_req->cmd_mgr;
 556         int index;
 557
 558         if (io_req->cmd_type == BNX2FC_SCSI_CMD)
 559                 index = io_req->xid % num_possible_cpus();
 560         else
 561                 index = RESERVE_FREE_LIST_INDEX;
 562
 563
 564         spin_lock_bh(&cmd_mgr->free_list_lock[index]);
 565         if (io_req->cmd_type != BNX2FC_SCSI_CMD)
 566                 bnx2fc_free_mp_resc(io_req);
 567         cmd_mgr->cmds[io_req->xid] = NULL;
 568         /* Delete IO from retire queue */
 569         list_del_init(&io_req->link);
 570         /* Add it to the free list */
 571         list_add(&io_req->link,
 572                         &cmd_mgr->free_list[index]);
 573         atomic_dec(&io_req->tgt->num_active_ios);
 574         spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
 575
 576 }
 577
 578 static void bnx2fc_free_mp_resc(struct bnx2fc_cmd *io_req)
 579 {
 580         struct bnx2fc_mp_req *mp_req = &(io_req->mp_req);
 581         struct bnx2fc_interface *interface = io_req->port->priv;
 582         struct bnx2fc_hba *hba = interface->hba;
 583         size_t sz = sizeof(struct fcoe_bd_ctx);
 584
 585         /* clear tm flags */
 586         mp_req->tm_flags = 0;
 587         if (mp_req->mp_req_bd) {
 588                 dma_free_coherent(&hba->pcidev->dev, sz,
 589                                      mp_req->mp_req_bd,
 590                                      mp_req->mp_req_bd_dma);
 591                 mp_req->mp_req_bd = NULL;
 592         }
 593         if (mp_req->mp_resp_bd) {
 594                 dma_free_coherent(&hba->pcidev->dev, sz,
 595                                      mp_req->mp_resp_bd,
 596                                      mp_req->mp_resp_bd_dma);
 597                 mp_req->mp_resp_bd = NULL;
 598         }
 599         if (mp_req->req_buf) {
 600                 dma_free_coherent(&hba->pcidev->dev, CNIC_PAGE_SIZE,
 601                                      mp_req->req_buf,
 602                                      mp_req->req_buf_dma);
 603                 mp_req->req_buf = NULL;
 604         }
 605         if (mp_req->resp_buf) {
 606                 dma_free_coherent(&hba->pcidev->dev, CNIC_PAGE_SIZE,
 607                                      mp_req->resp_buf,
 608                                      mp_req->resp_buf_dma);
 609                 mp_req->resp_buf = NULL;
 610         }
 611 }
 612
 613 int bnx2fc_init_mp_req(struct bnx2fc_cmd *io_req)
 614 {
 615         struct bnx2fc_mp_req *mp_req;
 616         struct fcoe_bd_ctx *mp_req_bd;
 617         struct fcoe_bd_ctx *mp_resp_bd;
 618         struct bnx2fc_interface *interface = io_req->port->priv;
 619         struct bnx2fc_hba *hba = interface->hba;
 620         dma_addr_t addr;
 621         size_t sz;
 622
 623         mp_req = (struct bnx2fc_mp_req *)&(io_req->mp_req);
 624         memset(mp_req, 0, sizeof(struct bnx2fc_mp_req));
 625
 626         mp_req->req_len = sizeof(struct fcp_cmnd);
 627         io_req->data_xfer_len = mp_req->req_len;
 628         mp_req->req_buf = dma_alloc_coherent(&hba->pcidev->dev, CNIC_PAGE_SIZE,
 629                                              &mp_req->req_buf_dma,
 630                                              GFP_ATOMIC);
 631         if (!mp_req->req_buf) {
 632                 printk(KERN_ERR PFX "unable to alloc MP req buffer\n");
 633                 bnx2fc_free_mp_resc(io_req);
 634                 return FAILED;
 635         }
 636
 637         mp_req->resp_buf = dma_alloc_coherent(&hba->pcidev->dev, CNIC_PAGE_SIZE,
 638                                               &mp_req->resp_buf_dma,
 639                                               GFP_ATOMIC);
 640         if (!mp_req->resp_buf) {
 641                 printk(KERN_ERR PFX "unable to alloc TM resp buffer\n");
 642                 bnx2fc_free_mp_resc(io_req);
 643                 return FAILED;
 644         }
 645         memset(mp_req->req_buf, 0, CNIC_PAGE_SIZE);
 646         memset(mp_req->resp_buf, 0, CNIC_PAGE_SIZE);
 647
 648         /* Allocate and map mp_req_bd and mp_resp_bd */
 649         sz = sizeof(struct fcoe_bd_ctx);
 650         mp_req->mp_req_bd = dma_alloc_coherent(&hba->pcidev->dev, sz,
 651                                                  &mp_req->mp_req_bd_dma,
 652                                                  GFP_ATOMIC);
 653         if (!mp_req->mp_req_bd) {
 654                 printk(KERN_ERR PFX "unable to alloc MP req bd\n");
 655                 bnx2fc_free_mp_resc(io_req);
 656                 return FAILED;
 657         }
 658         mp_req->mp_resp_bd = dma_alloc_coherent(&hba->pcidev->dev, sz,
 659                                                  &mp_req->mp_resp_bd_dma,
 660                                                  GFP_ATOMIC);
 661         if (!mp_req->mp_resp_bd) {
 662                 printk(KERN_ERR PFX "unable to alloc MP resp bd\n");
 663                 bnx2fc_free_mp_resc(io_req);
 664                 return FAILED;
 665         }
 666         /* Fill bd table */
 667         addr = mp_req->req_buf_dma;
 668         mp_req_bd = mp_req->mp_req_bd;
 669         mp_req_bd->buf_addr_lo = (u32)addr & 0xffffffff;
 670         mp_req_bd->buf_addr_hi = (u32)((u64)addr >> 32);
 671         mp_req_bd->buf_len = CNIC_PAGE_SIZE;
 672         mp_req_bd->flags = 0;
 673
 674         /*
 675          * MP buffer is either a task mgmt command or an ELS.
 676          * So the assumption is that it consumes a single bd
 677          * entry in the bd table
 678          */
 679         mp_resp_bd = mp_req->mp_resp_bd;
 680         addr = mp_req->resp_buf_dma;
 681         mp_resp_bd->buf_addr_lo = (u32)addr & 0xffffffff;
 682         mp_resp_bd->buf_addr_hi = (u32)((u64)addr >> 32);
 683         mp_resp_bd->buf_len = CNIC_PAGE_SIZE;
 684         mp_resp_bd->flags = 0;
 685
 686         return SUCCESS;
 687 }
 688
 689 static int bnx2fc_initiate_tmf(struct scsi_cmnd *sc_cmd, u8 tm_flags)
 690 {
 691         struct fc_lport *lport;
 692         struct fc_rport *rport;
 693         struct fc_rport_libfc_priv *rp;
 694         struct fcoe_port *port;
 695         struct bnx2fc_interface *interface;
 696         struct bnx2fc_rport *tgt;
 697         struct bnx2fc_cmd *io_req;
 698         struct bnx2fc_mp_req *tm_req;
 699         struct fcoe_task_ctx_entry *task;
 700         struct fcoe_task_ctx_entry *task_page;
 701         struct Scsi_Host *host = sc_cmd->device->host;
 702         struct fc_frame_header *fc_hdr;
 703         struct fcp_cmnd *fcp_cmnd;
 704         int task_idx, index;
 705         int rc = SUCCESS;
 706         u16 xid;
 707         u32 sid, did;
 708         unsigned long start = jiffies;
 709
 710         lport = shost_priv(host);
 711         rport = starget_to_rport(scsi_target(sc_cmd->device));
 712         port = lport_priv(lport);
 713         interface = port->priv;
 714
 715         if (rport == NULL) {
 716                 printk(KERN_ERR PFX "device_reset: rport is NULL\n");
 717                 rc = FAILED;
 718                 goto tmf_err;
 719         }
 720         rp = rport->dd_data;
 721
 722         rc = fc_block_scsi_eh(sc_cmd);
 723         if (rc)
 724                 return rc;
 725
 726         if (lport->state != LPORT_ST_READY || !(lport->link_up)) {
 727                 printk(KERN_ERR PFX "device_reset: link is not ready\n");
 728                 rc = FAILED;
 729                 goto tmf_err;
 730         }
 731         /* rport and tgt are allocated together, so tgt should be non-NULL */
 732         tgt = (struct bnx2fc_rport *)&rp[1];
 733
 734         if (!(test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags))) {
 735                 printk(KERN_ERR PFX "device_reset: tgt not offloaded\n");
 736                 rc = FAILED;
 737                 goto tmf_err;
 738         }
 739 retry_tmf:
 740         io_req = bnx2fc_elstm_alloc(tgt, BNX2FC_TASK_MGMT_CMD);
 741         if (!io_req) {
 742                 if (time_after(jiffies, start + HZ)) {
 743                         printk(KERN_ERR PFX "tmf: Failed TMF");
 744                         rc = FAILED;
 745                         goto tmf_err;
 746                 }
 747                 msleep(20);
 748                 goto retry_tmf;
 749         }
 750         /* Initialize rest of io_req fields */
 751         io_req->sc_cmd = sc_cmd;
 752         io_req->port = port;
 753         io_req->tgt = tgt;
 754
 755         tm_req = (struct bnx2fc_mp_req *)&(io_req->mp_req);
 756
 757         rc = bnx2fc_init_mp_req(io_req);
 758         if (rc == FAILED) {
 759                 printk(KERN_ERR PFX "Task mgmt MP request init failed\n");
 760                 spin_lock_bh(&tgt->tgt_lock);
 761                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
 762                 spin_unlock_bh(&tgt->tgt_lock);
 763                 goto tmf_err;
 764         }
 765
 766         /* Set TM flags */
 767         io_req->io_req_flags = 0;
 768         tm_req->tm_flags = tm_flags;
 769
 770         /* Fill FCP_CMND */
 771         bnx2fc_build_fcp_cmnd(io_req, (struct fcp_cmnd *)tm_req->req_buf);
 772         fcp_cmnd = (struct fcp_cmnd *)tm_req->req_buf;
 773         memset(fcp_cmnd->fc_cdb, 0,  sc_cmd->cmd_len);
 774         fcp_cmnd->fc_dl = 0;
 775
 776         /* Fill FC header */
 777         fc_hdr = &(tm_req->req_fc_hdr);
 778         sid = tgt->sid;
 779         did = rport->port_id;
 780         __fc_fill_fc_hdr(fc_hdr, FC_RCTL_DD_UNSOL_CMD, did, sid,
 781                            FC_TYPE_FCP, FC_FC_FIRST_SEQ | FC_FC_END_SEQ |
 782                            FC_FC_SEQ_INIT, 0);
 783         /* Obtain exchange id */
 784         xid = io_req->xid;
 785
 786         BNX2FC_TGT_DBG(tgt, "Initiate TMF - xid = 0x%x\n", xid);
 787         task_idx = xid/BNX2FC_TASKS_PER_PAGE;
 788         index = xid % BNX2FC_TASKS_PER_PAGE;
 789
 790         /* Initialize task context for this IO request */
 791         task_page = (struct fcoe_task_ctx_entry *)
 792                         interface->hba->task_ctx[task_idx];
 793         task = &(task_page[index]);
 794         bnx2fc_init_mp_task(io_req, task);
 795
 796         sc_cmd->SCp.ptr = (char *)io_req;
 797
 798         /* Obtain free SQ entry */
 799         spin_lock_bh(&tgt->tgt_lock);
 800         bnx2fc_add_2_sq(tgt, xid);
 801
 802         /* Enqueue the io_req to active_tm_queue */
 803         io_req->on_tmf_queue = 1;
 804         list_add_tail(&io_req->link, &tgt->active_tm_queue);
 805
 806         init_completion(&io_req->tm_done);
 807         io_req->wait_for_comp = 1;
 808
 809         /* Ring doorbell */
 810         bnx2fc_ring_doorbell(tgt);
 811         spin_unlock_bh(&tgt->tgt_lock);
 812
 813         rc = wait_for_completion_timeout(&io_req->tm_done,
 814                                          BNX2FC_TM_TIMEOUT * HZ);
 815         spin_lock_bh(&tgt->tgt_lock);
 816
 817         io_req->wait_for_comp = 0;
 818         if (!(test_bit(BNX2FC_FLAG_TM_COMPL, &io_req->req_flags))) {
 819                 set_bit(BNX2FC_FLAG_TM_TIMEOUT, &io_req->req_flags);
 820                 if (io_req->on_tmf_queue) {
 821                         list_del_init(&io_req->link);
 822                         io_req->on_tmf_queue = 0;
 823                 }
 824                 io_req->wait_for_comp = 1;
 825                 bnx2fc_initiate_cleanup(io_req);
 826                 spin_unlock_bh(&tgt->tgt_lock);
 827                 rc = wait_for_completion_timeout(&io_req->tm_done,
 828                                                  BNX2FC_FW_TIMEOUT);
 829                 spin_lock_bh(&tgt->tgt_lock);
 830                 io_req->wait_for_comp = 0;
 831                 if (!rc)
 832                         kref_put(&io_req->refcount, bnx2fc_cmd_release);
 833         }
 834
 835         spin_unlock_bh(&tgt->tgt_lock);
 836
 837         if (!rc) {
 838                 BNX2FC_TGT_DBG(tgt, "task mgmt command failed...\n");
 839                 rc = FAILED;
 840         } else {
 841                 BNX2FC_TGT_DBG(tgt, "task mgmt command success...\n");
 842                 rc = SUCCESS;
 843         }
 844 tmf_err:
 845         return rc;
 846 }
 847
 848 int bnx2fc_initiate_abts(struct bnx2fc_cmd *io_req)
 849 {
 850         struct fc_lport *lport;
 851         struct bnx2fc_rport *tgt = io_req->tgt;
 852         struct fc_rport *rport = tgt->rport;
 853         struct fc_rport_priv *rdata = tgt->rdata;
 854         struct bnx2fc_interface *interface;
 855         struct fcoe_port *port;
 856         struct bnx2fc_cmd *abts_io_req;
 857         struct fcoe_task_ctx_entry *task;
 858         struct fcoe_task_ctx_entry *task_page;
 859         struct fc_frame_header *fc_hdr;
 860         struct bnx2fc_mp_req *abts_req;
 861         int task_idx, index;
 862         u32 sid, did;
 863         u16 xid;
 864         int rc = SUCCESS;
 865         u32 r_a_tov = rdata->r_a_tov;
 866
 867         /* called with tgt_lock held */
 868         BNX2FC_IO_DBG(io_req, "Entered bnx2fc_initiate_abts\n");
 869
 870         port = io_req->port;
 871         interface = port->priv;
 872         lport = port->lport;
 873
 874         if (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags)) {
 875                 printk(KERN_ERR PFX "initiate_abts: tgt not offloaded\n");
 876                 rc = FAILED;
 877                 goto abts_err;
 878         }
 879
 880         if (rport == NULL) {
 881                 printk(KERN_ERR PFX "initiate_abts: rport is NULL\n");
 882                 rc = FAILED;
 883                 goto abts_err;
 884         }
 885
 886         if (lport->state != LPORT_ST_READY || !(lport->link_up)) {
 887                 printk(KERN_ERR PFX "initiate_abts: link is not ready\n");
 888                 rc = FAILED;
 889                 goto abts_err;
 890         }
 891
 892         abts_io_req = bnx2fc_elstm_alloc(tgt, BNX2FC_ABTS);
 893         if (!abts_io_req) {
 894                 printk(KERN_ERR PFX "abts: couldnt allocate cmd\n");
 895                 rc = FAILED;
 896                 goto abts_err;
 897         }
 898
 899         /* Initialize rest of io_req fields */
 900         abts_io_req->sc_cmd = NULL;
 901         abts_io_req->port = port;
 902         abts_io_req->tgt = tgt;
 903         abts_io_req->data_xfer_len = 0; /* No data transfer for ABTS */
 904
 905         abts_req = (struct bnx2fc_mp_req *)&(abts_io_req->mp_req);
 906         memset(abts_req, 0, sizeof(struct bnx2fc_mp_req));
 907
 908         /* Fill FC header */
 909         fc_hdr = &(abts_req->req_fc_hdr);
 910
 911         /* Obtain oxid and rxid for the original exchange to be aborted */
 912         fc_hdr->fh_ox_id = htons(io_req->xid);
 913         fc_hdr->fh_rx_id = htons(io_req->task->rxwr_txrd.var_ctx.rx_id);
 914
 915         sid = tgt->sid;
 916         did = rport->port_id;
 917
 918         __fc_fill_fc_hdr(fc_hdr, FC_RCTL_BA_ABTS, did, sid,
 919                            FC_TYPE_BLS, FC_FC_FIRST_SEQ | FC_FC_END_SEQ |
 920                            FC_FC_SEQ_INIT, 0);
 921
 922         xid = abts_io_req->xid;
 923         BNX2FC_IO_DBG(abts_io_req, "ABTS io_req\n");
 924         task_idx = xid/BNX2FC_TASKS_PER_PAGE;
 925         index = xid % BNX2FC_TASKS_PER_PAGE;
 926
 927         /* Initialize task context for this IO request */
 928         task_page = (struct fcoe_task_ctx_entry *)
 929                         interface->hba->task_ctx[task_idx];
 930         task = &(task_page[index]);
 931         bnx2fc_init_mp_task(abts_io_req, task);
 932
 933         /*
 934          * ABTS task is a temporary task that will be cleaned up
 935          * irrespective of ABTS response. We need to start the timer
 936          * for the original exchange, as the CQE is posted for the original
 937          * IO request.
 938          *
 939          * Timer for ABTS is started only when it is originated by a
 940          * TM request. For the ABTS issued as part of ULP timeout,
 941          * scsi-ml maintains the timers.
 942          */
 943
 944         /* if (test_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags))*/
 945         bnx2fc_cmd_timer_set(io_req, 2 * r_a_tov);
 946
 947         /* Obtain free SQ entry */
 948         bnx2fc_add_2_sq(tgt, xid);
 949
 950         /* Ring doorbell */
 951         bnx2fc_ring_doorbell(tgt);
 952
 953 abts_err:
 954         return rc;
 955 }
 956
 957 int bnx2fc_initiate_seq_cleanup(struct bnx2fc_cmd *orig_io_req, u32 offset,
 958                                 enum fc_rctl r_ctl)
 959 {
 960         struct fc_lport *lport;
 961         struct bnx2fc_rport *tgt = orig_io_req->tgt;
 962         struct bnx2fc_interface *interface;
 963         struct fcoe_port *port;
 964         struct bnx2fc_cmd *seq_clnp_req;
 965         struct fcoe_task_ctx_entry *task;
 966         struct fcoe_task_ctx_entry *task_page;
 967         struct bnx2fc_els_cb_arg *cb_arg = NULL;
 968         int task_idx, index;
 969         u16 xid;
 970         int rc = 0;
 971
 972         BNX2FC_IO_DBG(orig_io_req, "bnx2fc_initiate_seq_cleanup xid = 0x%x\n",
 973                    orig_io_req->xid);
 974         kref_get(&orig_io_req->refcount);
 975
 976         port = orig_io_req->port;
 977         interface = port->priv;
 978         lport = port->lport;
 979
 980         cb_arg = kzalloc(sizeof(struct bnx2fc_els_cb_arg), GFP_ATOMIC);
 981         if (!cb_arg) {
 982                 printk(KERN_ERR PFX "Unable to alloc cb_arg for seq clnup\n");
 983                 rc = -ENOMEM;
 984                 goto cleanup_err;
 985         }
 986
 987         seq_clnp_req = bnx2fc_elstm_alloc(tgt, BNX2FC_SEQ_CLEANUP);
 988         if (!seq_clnp_req) {
 989                 printk(KERN_ERR PFX "cleanup: couldnt allocate cmd\n");
 990                 rc = -ENOMEM;
 991                 kfree(cb_arg);
 992                 goto cleanup_err;
 993         }
 994         /* Initialize rest of io_req fields */
 995         seq_clnp_req->sc_cmd = NULL;
 996         seq_clnp_req->port = port;
 997         seq_clnp_req->tgt = tgt;
 998         seq_clnp_req->data_xfer_len = 0; /* No data transfer for cleanup */
 999
1000         xid = seq_clnp_req->xid;
1001
1002         task_idx = xid/BNX2FC_TASKS_PER_PAGE;
1003         index = xid % BNX2FC_TASKS_PER_PAGE;
1004
1005         /* Initialize task context for this IO request */
1006         task_page = (struct fcoe_task_ctx_entry *)
1007                      interface->hba->task_ctx[task_idx];
1008         task = &(task_page[index]);
1009         cb_arg->aborted_io_req = orig_io_req;
1010         cb_arg->io_req = seq_clnp_req;
1011         cb_arg->r_ctl = r_ctl;
1012         cb_arg->offset = offset;
1013         seq_clnp_req->cb_arg = cb_arg;
1014
1015         printk(KERN_ERR PFX "call init_seq_cleanup_task\n");
1016         bnx2fc_init_seq_cleanup_task(seq_clnp_req, task, orig_io_req, offset);
1017
1018         /* Obtain free SQ entry */
1019         bnx2fc_add_2_sq(tgt, xid);
1020
1021         /* Ring doorbell */
1022         bnx2fc_ring_doorbell(tgt);
1023 cleanup_err:
1024         return rc;
1025 }
1026
1027 int bnx2fc_initiate_cleanup(struct bnx2fc_cmd *io_req)
1028 {
1029         struct fc_lport *lport;
1030         struct bnx2fc_rport *tgt = io_req->tgt;
1031         struct bnx2fc_interface *interface;
1032         struct fcoe_port *port;
1033         struct bnx2fc_cmd *cleanup_io_req;
1034         struct fcoe_task_ctx_entry *task;
1035         struct fcoe_task_ctx_entry *task_page;
1036         int task_idx, index;
1037         u16 xid, orig_xid;
1038         int rc = 0;
1039
1040         /* ASSUMPTION: called with tgt_lock held */
1041         BNX2FC_IO_DBG(io_req, "Entered bnx2fc_initiate_cleanup\n");
1042
1043         port = io_req->port;
1044         interface = port->priv;
1045         lport = port->lport;
1046
1047         cleanup_io_req = bnx2fc_elstm_alloc(tgt, BNX2FC_CLEANUP);
1048         if (!cleanup_io_req) {
1049                 printk(KERN_ERR PFX "cleanup: couldnt allocate cmd\n");
1050                 rc = -1;
1051                 goto cleanup_err;
1052         }
1053
1054         /* Initialize rest of io_req fields */
1055         cleanup_io_req->sc_cmd = NULL;
1056         cleanup_io_req->port = port;
1057         cleanup_io_req->tgt = tgt;
1058         cleanup_io_req->data_xfer_len = 0; /* No data transfer for cleanup */
1059
1060         xid = cleanup_io_req->xid;
1061
1062         task_idx = xid/BNX2FC_TASKS_PER_PAGE;
1063         index = xid % BNX2FC_TASKS_PER_PAGE;
1064
1065         /* Initialize task context for this IO request */
1066         task_page = (struct fcoe_task_ctx_entry *)
1067                         interface->hba->task_ctx[task_idx];
1068         task = &(task_page[index]);
1069         orig_xid = io_req->xid;
1070
1071         BNX2FC_IO_DBG(io_req, "CLEANUP io_req xid = 0x%x\n", xid);
1072
1073         bnx2fc_init_cleanup_task(cleanup_io_req, task, orig_xid);
1074
1075         /* Obtain free SQ entry */
1076         bnx2fc_add_2_sq(tgt, xid);
1077
1078         /* Ring doorbell */
1079         bnx2fc_ring_doorbell(tgt);
1080
1081 cleanup_err:
1082         return rc;
1083 }
1084
1085 /**
1086  * bnx2fc_eh_target_reset: Reset a target
1087  *
1088  * @sc_cmd:     SCSI command
1089  *
1090  * Set from SCSI host template to send task mgmt command to the target
1091  *      and wait for the response
1092  */
1093 int bnx2fc_eh_target_reset(struct scsi_cmnd *sc_cmd)
1094 {
1095         return bnx2fc_initiate_tmf(sc_cmd, FCP_TMF_TGT_RESET);
1096 }
1097
1098 /**
1099  * bnx2fc_eh_device_reset - Reset a single LUN
1100  *
1101  * @sc_cmd:     SCSI command
1102  *
1103  * Set from SCSI host template to send task mgmt command to the target
1104  *      and wait for the response
1105  */
1106 int bnx2fc_eh_device_reset(struct scsi_cmnd *sc_cmd)
1107 {
1108         return bnx2fc_initiate_tmf(sc_cmd, FCP_TMF_LUN_RESET);
1109 }
1110
1111 int bnx2fc_expl_logo(struct fc_lport *lport, struct bnx2fc_cmd *io_req)
1112 {
1113         struct bnx2fc_rport *tgt = io_req->tgt;
1114         struct fc_rport_priv *rdata = tgt->rdata;
1115         int logo_issued;
1116         int rc = SUCCESS;
1117         int wait_cnt = 0;
1118
1119         BNX2FC_IO_DBG(io_req, "Expl logo - tgt flags = 0x%lx\n",
1120                       tgt->flags);
1121         logo_issued = test_and_set_bit(BNX2FC_FLAG_EXPL_LOGO,
1122                                        &tgt->flags);
1123         io_req->wait_for_comp = 1;
1124         bnx2fc_initiate_cleanup(io_req);
1125
1126         spin_unlock_bh(&tgt->tgt_lock);
1127
1128         wait_for_completion(&io_req->tm_done);
1129
1130         io_req->wait_for_comp = 0;
1131         /*
1132          * release the reference taken in eh_abort to allow the
1133          * target to re-login after flushing IOs
1134          */
1135          kref_put(&io_req->refcount, bnx2fc_cmd_release);
1136
1137         if (!logo_issued) {
1138                 clear_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags);
1139                 mutex_lock(&lport->disc.disc_mutex);
1140                 lport->tt.rport_logoff(rdata);
1141                 mutex_unlock(&lport->disc.disc_mutex);
1142                 do {
1143                         msleep(BNX2FC_RELOGIN_WAIT_TIME);
1144                         if (wait_cnt++ > BNX2FC_RELOGIN_WAIT_CNT) {
1145                                 rc = FAILED;
1146                                 break;
1147                         }
1148                 } while (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags));
1149         }
1150         spin_lock_bh(&tgt->tgt_lock);
1151         return rc;
1152 }
1153 /**
1154  * bnx2fc_eh_abort - eh_abort_handler api to abort an outstanding
1155  *                      SCSI command
1156  *
1157  * @sc_cmd:     SCSI_ML command pointer
1158  *
1159  * SCSI abort request handler
1160  */
1161 int bnx2fc_eh_abort(struct scsi_cmnd *sc_cmd)
1162 {
1163         struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
1164         struct fc_rport_libfc_priv *rp = rport->dd_data;
1165         struct bnx2fc_cmd *io_req;
1166         struct fc_lport *lport;
1167         struct bnx2fc_rport *tgt;
1168         int rc = FAILED;
1169
1170
1171         rc = fc_block_scsi_eh(sc_cmd);
1172         if (rc)
1173                 return rc;
1174
1175         lport = shost_priv(sc_cmd->device->host);
1176         if ((lport->state != LPORT_ST_READY) || !(lport->link_up)) {
1177                 printk(KERN_ERR PFX "eh_abort: link not ready\n");
1178                 return rc;
1179         }
1180
1181         tgt = (struct bnx2fc_rport *)&rp[1];
1182
1183         BNX2FC_TGT_DBG(tgt, "Entered bnx2fc_eh_abort\n");
1184
1185         spin_lock_bh(&tgt->tgt_lock);
1186         io_req = (struct bnx2fc_cmd *)sc_cmd->SCp.ptr;
1187         if (!io_req) {
1188                 /* Command might have just completed */
1189                 printk(KERN_ERR PFX "eh_abort: io_req is NULL\n");
1190                 spin_unlock_bh(&tgt->tgt_lock);
1191                 return SUCCESS;
1192         }
1193         BNX2FC_IO_DBG(io_req, "eh_abort - refcnt = %d\n",
1194                       io_req->refcount.refcount.counter);
1195
1196         /* Hold IO request across abort processing */
1197         kref_get(&io_req->refcount);
1198
1199         BUG_ON(tgt != io_req->tgt);
1200
1201         /* Remove the io_req from the active_q. */
1202         /*
1203          * Task Mgmt functions (LUN RESET & TGT RESET) will not
1204          * issue an ABTS on this particular IO req, as the
1205          * io_req is no longer in the active_q.
1206          */
1207         if (tgt->flush_in_prog) {
1208                 printk(KERN_ERR PFX "eh_abort: io_req (xid = 0x%x) "
1209                         "flush in progress\n", io_req->xid);
1210                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1211                 spin_unlock_bh(&tgt->tgt_lock);
1212                 return SUCCESS;
1213         }
1214
1215         if (io_req->on_active_queue == 0) {
1216                 printk(KERN_ERR PFX "eh_abort: io_req (xid = 0x%x) "
1217                                 "not on active_q\n", io_req->xid);
1218                 /*
1219                  * This condition can happen only due to the FW bug,
1220                  * where we do not receive cleanup response from
1221                  * the FW. Handle this case gracefully by erroring
1222                  * back the IO request to SCSI-ml
1223                  */
1224                 bnx2fc_scsi_done(io_req, DID_ABORT);
1225
1226                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1227                 spin_unlock_bh(&tgt->tgt_lock);
1228                 return SUCCESS;
1229         }
1230
1231         /*
1232          * Only eh_abort processing will remove the IO from
1233          * active_cmd_q before processing the request. this is
1234          * done to avoid race conditions between IOs aborted
1235          * as part of task management completion and eh_abort
1236          * processing
1237          */
1238         list_del_init(&io_req->link);
1239         io_req->on_active_queue = 0;
1240         /* Move IO req to retire queue */
1241         list_add_tail(&io_req->link, &tgt->io_retire_queue);
1242
1243         init_completion(&io_req->tm_done);
1244
1245         if (test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags)) {
1246                 printk(KERN_ERR PFX "eh_abort: io_req (xid = 0x%x) "
1247                                 "already in abts processing\n", io_req->xid);
1248                 if (cancel_delayed_work(&io_req->timeout_work))
1249                         kref_put(&io_req->refcount,
1250                                  bnx2fc_cmd_release); /* drop timer hold */
1251                 rc = bnx2fc_expl_logo(lport, io_req);
1252                 /* This only occurs when an task abort was requested while ABTS
1253                    is in progress.  Setting the IO_CLEANUP flag will skip the
1254                    RRQ process in the case when the fw generated SCSI_CMD cmpl
1255                    was a result from the ABTS request rather than the CLEANUP
1256                    request */
1257                 set_bit(BNX2FC_FLAG_IO_CLEANUP, &io_req->req_flags);
1258                 goto out;
1259         }
1260
1261         /* Cancel the current timer running on this io_req */
1262         if (cancel_delayed_work(&io_req->timeout_work))
1263                 kref_put(&io_req->refcount,
1264                          bnx2fc_cmd_release); /* drop timer hold */
1265         set_bit(BNX2FC_FLAG_EH_ABORT, &io_req->req_flags);
1266         io_req->wait_for_comp = 1;
1267         rc = bnx2fc_initiate_abts(io_req);
1268         if (rc == FAILED) {
1269                 bnx2fc_initiate_cleanup(io_req);
1270                 spin_unlock_bh(&tgt->tgt_lock);
1271                 wait_for_completion(&io_req->tm_done);
1272                 spin_lock_bh(&tgt->tgt_lock);
1273                 io_req->wait_for_comp = 0;
1274                 goto done;
1275         }
1276         spin_unlock_bh(&tgt->tgt_lock);
1277
1278         wait_for_completion(&io_req->tm_done);
1279
1280         spin_lock_bh(&tgt->tgt_lock);
1281         io_req->wait_for_comp = 0;
1282         if (test_bit(BNX2FC_FLAG_IO_COMPL, &io_req->req_flags)) {
1283                 BNX2FC_IO_DBG(io_req, "IO completed in a different context\n");
1284                 rc = SUCCESS;
1285         } else if (!(test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
1286                                       &io_req->req_flags))) {
1287                 /* Let the scsi-ml try to recover this command */
1288                 printk(KERN_ERR PFX "abort failed, xid = 0x%x\n",
1289                        io_req->xid);
1290                 rc = bnx2fc_expl_logo(lport, io_req);
1291                 goto out;
1292         } else {
1293                 /*
1294                  * We come here even when there was a race condition
1295                  * between timeout and abts completion, and abts
1296                  * completion happens just in time.
1297                  */
1298                 BNX2FC_IO_DBG(io_req, "abort succeeded\n");
1299                 rc = SUCCESS;
1300                 bnx2fc_scsi_done(io_req, DID_ABORT);
1301                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1302         }
1303 done:
1304         /* release the reference taken in eh_abort */
1305         kref_put(&io_req->refcount, bnx2fc_cmd_release);
1306 out:
1307         spin_unlock_bh(&tgt->tgt_lock);
1308         return rc;
1309 }
1310
1311 void bnx2fc_process_seq_cleanup_compl(struct bnx2fc_cmd *seq_clnp_req,
1312                                       struct fcoe_task_ctx_entry *task,
1313                                       u8 rx_state)
1314 {
1315         struct bnx2fc_els_cb_arg *cb_arg = seq_clnp_req->cb_arg;
1316         struct bnx2fc_cmd *orig_io_req = cb_arg->aborted_io_req;
1317         u32 offset = cb_arg->offset;
1318         enum fc_rctl r_ctl = cb_arg->r_ctl;
1319         int rc = 0;
1320         struct bnx2fc_rport *tgt = orig_io_req->tgt;
1321
1322         BNX2FC_IO_DBG(orig_io_req, "Entered process_cleanup_compl xid = 0x%x"
1323                               "cmd_type = %d\n",
1324                    seq_clnp_req->xid, seq_clnp_req->cmd_type);
1325
1326         if (rx_state == FCOE_TASK_RX_STATE_IGNORED_SEQUENCE_CLEANUP) {
1327                 printk(KERN_ERR PFX "seq cleanup ignored - xid = 0x%x\n",
1328                         seq_clnp_req->xid);
1329                 goto free_cb_arg;
1330         }
1331
1332         spin_unlock_bh(&tgt->tgt_lock);
1333         rc = bnx2fc_send_srr(orig_io_req, offset, r_ctl);
1334         spin_lock_bh(&tgt->tgt_lock);
1335
1336         if (rc)
1337                 printk(KERN_ERR PFX "clnup_compl: Unable to send SRR"
1338                         " IO will abort\n");
1339         seq_clnp_req->cb_arg = NULL;
1340         kref_put(&orig_io_req->refcount, bnx2fc_cmd_release);
1341 free_cb_arg:
1342         kfree(cb_arg);
1343         return;
1344 }
1345
1346 void bnx2fc_process_cleanup_compl(struct bnx2fc_cmd *io_req,
1347                                   struct fcoe_task_ctx_entry *task,
1348                                   u8 num_rq)
1349 {
1350         BNX2FC_IO_DBG(io_req, "Entered process_cleanup_compl "
1351                               "refcnt = %d, cmd_type = %d\n",
1352                    io_req->refcount.refcount.counter, io_req->cmd_type);
1353         bnx2fc_scsi_done(io_req, DID_ERROR);
1354         kref_put(&io_req->refcount, bnx2fc_cmd_release);
1355         if (io_req->wait_for_comp)
1356                 complete(&io_req->tm_done);
1357 }
1358
1359 void bnx2fc_process_abts_compl(struct bnx2fc_cmd *io_req,
1360                                struct fcoe_task_ctx_entry *task,
1361                                u8 num_rq)
1362 {
1363         u32 r_ctl;
1364         u32 r_a_tov = FC_DEF_R_A_TOV;
1365         u8 issue_rrq = 0;
1366         struct bnx2fc_rport *tgt = io_req->tgt;
1367
1368         BNX2FC_IO_DBG(io_req, "Entered process_abts_compl xid = 0x%x"
1369                               "refcnt = %d, cmd_type = %d\n",
1370                    io_req->xid,
1371                    io_req->refcount.refcount.counter, io_req->cmd_type);
1372
1373         if (test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
1374                                        &io_req->req_flags)) {
1375                 BNX2FC_IO_DBG(io_req, "Timer context finished processing"
1376                                 " this io\n");
1377                 return;
1378         }
1379
1380         /* Do not issue RRQ as this IO is already cleanedup */
1381         if (test_and_set_bit(BNX2FC_FLAG_IO_CLEANUP,
1382                                 &io_req->req_flags))
1383                 goto io_compl;
1384
1385         /*
1386          * For ABTS issued due to SCSI eh_abort_handler, timeout
1387          * values are maintained by scsi-ml itself. Cancel timeout
1388          * in case ABTS issued as part of task management function
1389          * or due to FW error.
1390          */
1391         if (test_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags))
1392                 if (cancel_delayed_work(&io_req->timeout_work))
1393                         kref_put(&io_req->refcount,
1394                                  bnx2fc_cmd_release); /* drop timer hold */
1395
1396         r_ctl = (u8)task->rxwr_only.union_ctx.comp_info.abts_rsp.r_ctl;
1397
1398         switch (r_ctl) {
1399         case FC_RCTL_BA_ACC:
1400                 /*
1401                  * Dont release this cmd yet. It will be relesed
1402                  * after we get RRQ response
1403                  */
1404                 BNX2FC_IO_DBG(io_req, "ABTS response - ACC Send RRQ\n");
1405                 issue_rrq = 1;
1406                 break;
1407
1408         case FC_RCTL_BA_RJT:
1409                 BNX2FC_IO_DBG(io_req, "ABTS response - RJT\n");
1410                 break;
1411         default:
1412                 printk(KERN_ERR PFX "Unknown ABTS response\n");
1413                 break;
1414         }
1415
1416         if (issue_rrq) {
1417                 BNX2FC_IO_DBG(io_req, "Issue RRQ after R_A_TOV\n");
1418                 set_bit(BNX2FC_FLAG_ISSUE_RRQ, &io_req->req_flags);
1419         }
1420         set_bit(BNX2FC_FLAG_RETIRE_OXID, &io_req->req_flags);
1421         bnx2fc_cmd_timer_set(io_req, r_a_tov);
1422
1423 io_compl:
1424         if (io_req->wait_for_comp) {
1425                 if (test_and_clear_bit(BNX2FC_FLAG_EH_ABORT,
1426                                        &io_req->req_flags))
1427                         complete(&io_req->tm_done);
1428         } else {
1429                 /*
1430                  * We end up here when ABTS is issued as
1431                  * in asynchronous context, i.e., as part
1432                  * of task management completion, or
1433                  * when FW error is received or when the
1434                  * ABTS is issued when the IO is timed
1435                  * out.
1436                  */
1437
1438                 if (io_req->on_active_queue) {
1439                         list_del_init(&io_req->link);
1440                         io_req->on_active_queue = 0;
1441                         /* Move IO req to retire queue */
1442                         list_add_tail(&io_req->link, &tgt->io_retire_queue);
1443                 }
1444                 bnx2fc_scsi_done(io_req, DID_ERROR);
1445                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1446         }
1447 }
1448
1449 static void bnx2fc_lun_reset_cmpl(struct bnx2fc_cmd *io_req)
1450 {
1451         struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1452         struct bnx2fc_rport *tgt = io_req->tgt;
1453         struct bnx2fc_cmd *cmd, *tmp;
1454         u64 tm_lun = sc_cmd->device->lun;
1455         u64 lun;
1456         int rc = 0;
1457
1458         /* called with tgt_lock held */
1459         BNX2FC_IO_DBG(io_req, "Entered bnx2fc_lun_reset_cmpl\n");
1460         /*
1461          * Walk thru the active_ios queue and ABORT the IO
1462          * that matches with the LUN that was reset
1463          */
1464         list_for_each_entry_safe(cmd, tmp, &tgt->active_cmd_queue, link) {
1465                 BNX2FC_TGT_DBG(tgt, "LUN RST cmpl: scan for pending IOs\n");
1466                 lun = cmd->sc_cmd->device->lun;
1467                 if (lun == tm_lun) {
1468                         /* Initiate ABTS on this cmd */
1469                         if (!test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS,
1470                                               &cmd->req_flags)) {
1471                                 /* cancel the IO timeout */
1472                                 if (cancel_delayed_work(&io_req->timeout_work))
1473                                         kref_put(&io_req->refcount,
1474                                                  bnx2fc_cmd_release);
1475                                                         /* timer hold */
1476                                 rc = bnx2fc_initiate_abts(cmd);
1477                                 /* abts shouldn't fail in this context */
1478                                 WARN_ON(rc != SUCCESS);
1479                         } else
1480                                 printk(KERN_ERR PFX "lun_rst: abts already in"
1481                                         " progress for this IO 0x%x\n",
1482                                         cmd->xid);
1483                 }
1484         }
1485 }
1486
1487 static void bnx2fc_tgt_reset_cmpl(struct bnx2fc_cmd *io_req)
1488 {
1489         struct bnx2fc_rport *tgt = io_req->tgt;
1490         struct bnx2fc_cmd *cmd, *tmp;
1491         int rc = 0;
1492
1493         /* called with tgt_lock held */
1494         BNX2FC_IO_DBG(io_req, "Entered bnx2fc_tgt_reset_cmpl\n");
1495         /*
1496          * Walk thru the active_ios queue and ABORT the IO
1497          * that matches with the LUN that was reset
1498          */
1499         list_for_each_entry_safe(cmd, tmp, &tgt->active_cmd_queue, link) {
1500                 BNX2FC_TGT_DBG(tgt, "TGT RST cmpl: scan for pending IOs\n");
1501                 /* Initiate ABTS */
1502                 if (!test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS,
1503                                                         &cmd->req_flags)) {
1504                         /* cancel the IO timeout */
1505                         if (cancel_delayed_work(&io_req->timeout_work))
1506                                 kref_put(&io_req->refcount,
1507                                          bnx2fc_cmd_release); /* timer hold */
1508                         rc = bnx2fc_initiate_abts(cmd);
1509                         /* abts shouldn't fail in this context */
1510                         WARN_ON(rc != SUCCESS);
1511
1512                 } else
1513                         printk(KERN_ERR PFX "tgt_rst: abts already in progress"
1514                                 " for this IO 0x%x\n", cmd->xid);
1515         }
1516 }
1517
1518 void bnx2fc_process_tm_compl(struct bnx2fc_cmd *io_req,
1519                              struct fcoe_task_ctx_entry *task, u8 num_rq)
1520 {
1521         struct bnx2fc_mp_req *tm_req;
1522         struct fc_frame_header *fc_hdr;
1523         struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1524         u64 *hdr;
1525         u64 *temp_hdr;
1526         void *rsp_buf;
1527
1528         /* Called with tgt_lock held */
1529         BNX2FC_IO_DBG(io_req, "Entered process_tm_compl\n");
1530
1531         if (!(test_bit(BNX2FC_FLAG_TM_TIMEOUT, &io_req->req_flags)))
1532                 set_bit(BNX2FC_FLAG_TM_COMPL, &io_req->req_flags);
1533         else {
1534                 /* TM has already timed out and we got
1535                  * delayed completion. Ignore completion
1536                  * processing.
1537                  */
1538                 return;
1539         }
1540
1541         tm_req = &(io_req->mp_req);
1542         fc_hdr = &(tm_req->resp_fc_hdr);
1543         hdr = (u64 *)fc_hdr;
1544         temp_hdr = (u64 *)
1545                 &task->rxwr_only.union_ctx.comp_info.mp_rsp.fc_hdr;
1546         hdr[0] = cpu_to_be64(temp_hdr[0]);
1547         hdr[1] = cpu_to_be64(temp_hdr[1]);
1548         hdr[2] = cpu_to_be64(temp_hdr[2]);
1549
1550         tm_req->resp_len =
1551                 task->rxwr_only.union_ctx.comp_info.mp_rsp.mp_payload_len;
1552
1553         rsp_buf = tm_req->resp_buf;
1554
1555         if (fc_hdr->fh_r_ctl == FC_RCTL_DD_CMD_STATUS) {
1556                 bnx2fc_parse_fcp_rsp(io_req,
1557                                      (struct fcoe_fcp_rsp_payload *)
1558                                      rsp_buf, num_rq);
1559                 if (io_req->fcp_rsp_code == 0) {
1560                         /* TM successful */
1561                         if (tm_req->tm_flags & FCP_TMF_LUN_RESET)
1562                                 bnx2fc_lun_reset_cmpl(io_req);
1563                         else if (tm_req->tm_flags & FCP_TMF_TGT_RESET)
1564                                 bnx2fc_tgt_reset_cmpl(io_req);
1565                 }
1566         } else {
1567                 printk(KERN_ERR PFX "tmf's fc_hdr r_ctl = 0x%x\n",
1568                         fc_hdr->fh_r_ctl);
1569         }
1570         if (!sc_cmd->SCp.ptr) {
1571                 printk(KERN_ERR PFX "tm_compl: SCp.ptr is NULL\n");
1572                 return;
1573         }
1574         switch (io_req->fcp_status) {
1575         case FC_GOOD:
1576                 if (io_req->cdb_status == 0) {
1577                         /* Good IO completion */
1578                         sc_cmd->result = DID_OK << 16;
1579                 } else {
1580                         /* Transport status is good, SCSI status not good */
1581                         sc_cmd->result = (DID_OK << 16) | io_req->cdb_status;
1582                 }
1583                 if (io_req->fcp_resid)
1584                         scsi_set_resid(sc_cmd, io_req->fcp_resid);
1585                 break;
1586
1587         default:
1588                 BNX2FC_IO_DBG(io_req, "process_tm_compl: fcp_status = %d\n",
1589                            io_req->fcp_status);
1590                 break;
1591         }
1592
1593         sc_cmd = io_req->sc_cmd;
1594         io_req->sc_cmd = NULL;
1595
1596         /* check if the io_req exists in tgt's tmf_q */
1597         if (io_req->on_tmf_queue) {
1598
1599                 list_del_init(&io_req->link);
1600                 io_req->on_tmf_queue = 0;
1601         } else {
1602
1603                 printk(KERN_ERR PFX "Command not on active_cmd_queue!\n");
1604                 return;
1605         }
1606
1607         sc_cmd->SCp.ptr = NULL;
1608         sc_cmd->scsi_done(sc_cmd);
1609
1610         kref_put(&io_req->refcount, bnx2fc_cmd_release);
1611         if (io_req->wait_for_comp) {
1612                 BNX2FC_IO_DBG(io_req, "tm_compl - wake up the waiter\n");
1613                 complete(&io_req->tm_done);
1614         }
1615 }
1616
1617 static int bnx2fc_split_bd(struct bnx2fc_cmd *io_req, u64 addr, int sg_len,
1618                            int bd_index)
1619 {
1620         struct fcoe_bd_ctx *bd = io_req->bd_tbl->bd_tbl;
1621         int frag_size, sg_frags;
1622
1623         sg_frags = 0;
1624         while (sg_len) {
1625                 if (sg_len >= BNX2FC_BD_SPLIT_SZ)
1626                         frag_size = BNX2FC_BD_SPLIT_SZ;
1627                 else
1628                         frag_size = sg_len;
1629                 bd[bd_index + sg_frags].buf_addr_lo = addr & 0xffffffff;
1630                 bd[bd_index + sg_frags].buf_addr_hi  = addr >> 32;
1631                 bd[bd_index + sg_frags].buf_len = (u16)frag_size;
1632                 bd[bd_index + sg_frags].flags = 0;
1633
1634                 addr += (u64) frag_size;
1635                 sg_frags++;
1636                 sg_len -= frag_size;
1637         }
1638         return sg_frags;
1639
1640 }
1641
1642 static int bnx2fc_map_sg(struct bnx2fc_cmd *io_req)
1643 {
1644         struct bnx2fc_interface *interface = io_req->port->priv;
1645         struct bnx2fc_hba *hba = interface->hba;
1646         struct scsi_cmnd *sc = io_req->sc_cmd;
1647         struct fcoe_bd_ctx *bd = io_req->bd_tbl->bd_tbl;
1648         struct scatterlist *sg;
1649         int byte_count = 0;
1650         int sg_count = 0;
1651         int bd_count = 0;
1652         int sg_frags;
1653         unsigned int sg_len;
1654         u64 addr;
1655         int i;
1656
1657         /*
1658          * Use dma_map_sg directly to ensure we're using the correct
1659          * dev struct off of pcidev.
1660          */
1661         sg_count = dma_map_sg(&hba->pcidev->dev, scsi_sglist(sc),
1662                               scsi_sg_count(sc), sc->sc_data_direction);
1663         scsi_for_each_sg(sc, sg, sg_count, i) {
1664                 sg_len = sg_dma_len(sg);
1665                 addr = sg_dma_address(sg);
1666                 if (sg_len > BNX2FC_MAX_BD_LEN) {
1667                         sg_frags = bnx2fc_split_bd(io_req, addr, sg_len,
1668                                                    bd_count);
1669                 } else {
1670
1671                         sg_frags = 1;
1672                         bd[bd_count].buf_addr_lo = addr & 0xffffffff;
1673                         bd[bd_count].buf_addr_hi  = addr >> 32;
1674                         bd[bd_count].buf_len = (u16)sg_len;
1675                         bd[bd_count].flags = 0;
1676                 }
1677                 bd_count += sg_frags;
1678                 byte_count += sg_len;
1679         }
1680         if (byte_count != scsi_bufflen(sc))
1681                 printk(KERN_ERR PFX "byte_count = %d != scsi_bufflen = %d, "
1682                         "task_id = 0x%x\n", byte_count, scsi_bufflen(sc),
1683                         io_req->xid);
1684         return bd_count;
1685 }
1686
1687 static int bnx2fc_build_bd_list_from_sg(struct bnx2fc_cmd *io_req)
1688 {
1689         struct scsi_cmnd *sc = io_req->sc_cmd;
1690         struct fcoe_bd_ctx *bd = io_req->bd_tbl->bd_tbl;
1691         int bd_count;
1692
1693         if (scsi_sg_count(sc)) {
1694                 bd_count = bnx2fc_map_sg(io_req);
1695                 if (bd_count == 0)
1696                         return -ENOMEM;
1697         } else {
1698                 bd_count = 0;
1699                 bd[0].buf_addr_lo = bd[0].buf_addr_hi = 0;
1700                 bd[0].buf_len = bd[0].flags = 0;
1701         }
1702         io_req->bd_tbl->bd_valid = bd_count;
1703
1704         return 0;
1705 }
1706
1707 static void bnx2fc_unmap_sg_list(struct bnx2fc_cmd *io_req)
1708 {
1709         struct scsi_cmnd *sc = io_req->sc_cmd;
1710         struct bnx2fc_interface *interface = io_req->port->priv;
1711         struct bnx2fc_hba *hba = interface->hba;
1712
1713         /*
1714          * Use dma_unmap_sg directly to ensure we're using the correct
1715          * dev struct off of pcidev.
1716          */
1717         if (io_req->bd_tbl->bd_valid && sc && scsi_sg_count(sc)) {
1718                 dma_unmap_sg(&hba->pcidev->dev, scsi_sglist(sc),
1719                     scsi_sg_count(sc), sc->sc_data_direction);
1720                 io_req->bd_tbl->bd_valid = 0;
1721         }
1722 }
1723
1724 void bnx2fc_build_fcp_cmnd(struct bnx2fc_cmd *io_req,
1725                                   struct fcp_cmnd *fcp_cmnd)
1726 {
1727         struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1728
1729         memset(fcp_cmnd, 0, sizeof(struct fcp_cmnd));
1730
1731         int_to_scsilun(sc_cmd->device->lun, &fcp_cmnd->fc_lun);
1732
1733         fcp_cmnd->fc_dl = htonl(io_req->data_xfer_len);
1734         memcpy(fcp_cmnd->fc_cdb, sc_cmd->cmnd, sc_cmd->cmd_len);
1735
1736         fcp_cmnd->fc_cmdref = 0;
1737         fcp_cmnd->fc_pri_ta = 0;
1738         fcp_cmnd->fc_tm_flags = io_req->mp_req.tm_flags;
1739         fcp_cmnd->fc_flags = io_req->io_req_flags;
1740         fcp_cmnd->fc_pri_ta = FCP_PTA_SIMPLE;
1741 }
1742
1743 static void bnx2fc_parse_fcp_rsp(struct bnx2fc_cmd *io_req,
1744                                  struct fcoe_fcp_rsp_payload *fcp_rsp,
1745                                  u8 num_rq)
1746 {
1747         struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1748         struct bnx2fc_rport *tgt = io_req->tgt;
1749         u8 rsp_flags = fcp_rsp->fcp_flags.flags;
1750         u32 rq_buff_len = 0;
1751         int i;
1752         unsigned char *rq_data;
1753         unsigned char *dummy;
1754         int fcp_sns_len = 0;
1755         int fcp_rsp_len = 0;
1756
1757         io_req->fcp_status = FC_GOOD;
1758         io_req->fcp_resid = fcp_rsp->fcp_resid;
1759
1760         io_req->scsi_comp_flags = rsp_flags;
1761         CMD_SCSI_STATUS(sc_cmd) = io_req->cdb_status =
1762                                 fcp_rsp->scsi_status_code;
1763
1764         /* Fetch fcp_rsp_info and fcp_sns_info if available */
1765         if (num_rq) {
1766
1767                 /*
1768                  * We do not anticipate num_rq >1, as the linux defined
1769                  * SCSI_SENSE_BUFFERSIZE is 96 bytes + 8 bytes of FCP_RSP_INFO
1770                  * 256 bytes of single rq buffer is good enough to hold this.
1771                  */
1772
1773                 if (rsp_flags &
1774                     FCOE_FCP_RSP_FLAGS_FCP_RSP_LEN_VALID) {
1775                         fcp_rsp_len = rq_buff_len
1776                                         = fcp_rsp->fcp_rsp_len;
1777                 }
1778
1779                 if (rsp_flags &
1780                     FCOE_FCP_RSP_FLAGS_FCP_SNS_LEN_VALID) {
1781                         fcp_sns_len = fcp_rsp->fcp_sns_len;
1782                         rq_buff_len += fcp_rsp->fcp_sns_len;
1783                 }
1784
1785                 io_req->fcp_rsp_len = fcp_rsp_len;
1786                 io_req->fcp_sns_len = fcp_sns_len;
1787
1788                 if (rq_buff_len > num_rq * BNX2FC_RQ_BUF_SZ) {
1789                         /* Invalid sense sense length. */
1790                         printk(KERN_ERR PFX "invalid sns length %d\n",
1791                                 rq_buff_len);
1792                         /* reset rq_buff_len */
1793                         rq_buff_len =  num_rq * BNX2FC_RQ_BUF_SZ;
1794                 }
1795
1796                 rq_data = bnx2fc_get_next_rqe(tgt, 1);
1797
1798                 if (num_rq > 1) {
1799                         /* We do not need extra sense data */
1800                         for (i = 1; i < num_rq; i++)
1801                                 dummy = bnx2fc_get_next_rqe(tgt, 1);
1802                 }
1803
1804                 /* fetch fcp_rsp_code */
1805                 if ((fcp_rsp_len == 4) || (fcp_rsp_len == 8)) {
1806                         /* Only for task management function */
1807                         io_req->fcp_rsp_code = rq_data[3];
1808                         printk(KERN_ERR PFX "fcp_rsp_code = %d\n",
1809                                 io_req->fcp_rsp_code);
1810                 }
1811
1812                 /* fetch sense data */
1813                 rq_data += fcp_rsp_len;
1814
1815                 if (fcp_sns_len > SCSI_SENSE_BUFFERSIZE) {
1816                         printk(KERN_ERR PFX "Truncating sense buffer\n");
1817                         fcp_sns_len = SCSI_SENSE_BUFFERSIZE;
1818                 }
1819
1820                 memset(sc_cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1821                 if (fcp_sns_len)
1822                         memcpy(sc_cmd->sense_buffer, rq_data, fcp_sns_len);
1823
1824                 /* return RQ entries */
1825                 for (i = 0; i < num_rq; i++)
1826                         bnx2fc_return_rqe(tgt, 1);
1827         }
1828 }
1829
1830 /**
1831  * bnx2fc_queuecommand - Queuecommand function of the scsi template
1832  *
1833  * @host:       The Scsi_Host the command was issued to
1834  * @sc_cmd:     struct scsi_cmnd to be executed
1835  *
1836  * This is the IO strategy routine, called by SCSI-ML
1837  **/
1838 int bnx2fc_queuecommand(struct Scsi_Host *host,
1839                         struct scsi_cmnd *sc_cmd)
1840 {
1841         struct fc_lport *lport = shost_priv(host);
1842         struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
1843         struct fc_rport_libfc_priv *rp = rport->dd_data;
1844         struct bnx2fc_rport *tgt;
1845         struct bnx2fc_cmd *io_req;
1846         int rc = 0;
1847         int rval;
1848
1849         rval = fc_remote_port_chkready(rport);
1850         if (rval) {
1851                 sc_cmd->result = rval;
1852                 sc_cmd->scsi_done(sc_cmd);
1853                 return 0;
1854         }
1855
1856         if ((lport->state != LPORT_ST_READY) || !(lport->link_up)) {
1857                 rc = SCSI_MLQUEUE_HOST_BUSY;
1858                 goto exit_qcmd;
1859         }
1860
1861         /* rport and tgt are allocated together, so tgt should be non-NULL */
1862         tgt = (struct bnx2fc_rport *)&rp[1];
1863
1864         if (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags)) {
1865                 /*
1866                  * Session is not offloaded yet. Let SCSI-ml retry
1867                  * the command.
1868                  */
1869                 rc = SCSI_MLQUEUE_TARGET_BUSY;
1870                 goto exit_qcmd;
1871         }
1872         if (tgt->retry_delay_timestamp) {
1873                 if (time_after(jiffies, tgt->retry_delay_timestamp)) {
1874                         tgt->retry_delay_timestamp = 0;
1875                 } else {
1876                         /* If retry_delay timer is active, flow off the ML */
1877                         rc = SCSI_MLQUEUE_TARGET_BUSY;
1878                         goto exit_qcmd;
1879                 }
1880         }
1881
1882         spin_lock_bh(&tgt->tgt_lock);
1883
1884         io_req = bnx2fc_cmd_alloc(tgt);
1885         if (!io_req) {
1886                 rc = SCSI_MLQUEUE_HOST_BUSY;
1887                 goto exit_qcmd_tgtlock;
1888         }
1889         io_req->sc_cmd = sc_cmd;
1890
1891         if (bnx2fc_post_io_req(tgt, io_req)) {
1892                 printk(KERN_ERR PFX "Unable to post io_req\n");
1893                 rc = SCSI_MLQUEUE_HOST_BUSY;
1894                 goto exit_qcmd_tgtlock;
1895         }
1896
1897 exit_qcmd_tgtlock:
1898         spin_unlock_bh(&tgt->tgt_lock);
1899 exit_qcmd:
1900         return rc;
1901 }
1902
1903 void bnx2fc_process_scsi_cmd_compl(struct bnx2fc_cmd *io_req,
1904                                    struct fcoe_task_ctx_entry *task,
1905                                    u8 num_rq)
1906 {
1907         struct fcoe_fcp_rsp_payload *fcp_rsp;
1908         struct bnx2fc_rport *tgt = io_req->tgt;
1909         struct scsi_cmnd *sc_cmd;
1910         struct Scsi_Host *host;
1911
1912
1913         /* scsi_cmd_cmpl is called with tgt lock held */
1914
1915         if (test_and_set_bit(BNX2FC_FLAG_IO_COMPL, &io_req->req_flags)) {
1916                 /* we will not receive ABTS response for this IO */
1917                 BNX2FC_IO_DBG(io_req, "Timer context finished processing "
1918                            "this scsi cmd\n");
1919         }
1920
1921         /* Cancel the timeout_work, as we received IO completion */
1922         if (cancel_delayed_work(&io_req->timeout_work))
1923                 kref_put(&io_req->refcount,
1924                          bnx2fc_cmd_release); /* drop timer hold */
1925
1926         sc_cmd = io_req->sc_cmd;
1927         if (sc_cmd == NULL) {
1928                 printk(KERN_ERR PFX "scsi_cmd_compl - sc_cmd is NULL\n");
1929                 return;
1930         }
1931
1932         /* Fetch fcp_rsp from task context and perform cmd completion */
1933         fcp_rsp = (struct fcoe_fcp_rsp_payload *)
1934                    &(task->rxwr_only.union_ctx.comp_info.fcp_rsp.payload);
1935
1936         /* parse fcp_rsp and obtain sense data from RQ if available */
1937         bnx2fc_parse_fcp_rsp(io_req, fcp_rsp, num_rq);
1938
1939         host = sc_cmd->device->host;
1940         if (!sc_cmd->SCp.ptr) {
1941                 printk(KERN_ERR PFX "SCp.ptr is NULL\n");
1942                 return;
1943         }
1944
1945         if (io_req->on_active_queue) {
1946                 list_del_init(&io_req->link);
1947                 io_req->on_active_queue = 0;
1948                 /* Move IO req to retire queue */
1949                 list_add_tail(&io_req->link, &tgt->io_retire_queue);
1950         } else {
1951                 /* This should not happen, but could have been pulled
1952                  * by bnx2fc_flush_active_ios(), or during a race
1953                  * between command abort and (late) completion.
1954                  */
1955                 BNX2FC_IO_DBG(io_req, "xid not on active_cmd_queue\n");
1956                 if (io_req->wait_for_comp)
1957                         if (test_and_clear_bit(BNX2FC_FLAG_EH_ABORT,
1958                                                &io_req->req_flags))
1959                                 complete(&io_req->tm_done);
1960         }
1961
1962         bnx2fc_unmap_sg_list(io_req);
1963         io_req->sc_cmd = NULL;
1964
1965         switch (io_req->fcp_status) {
1966         case FC_GOOD:
1967                 if (io_req->cdb_status == 0) {
1968                         /* Good IO completion */
1969                         sc_cmd->result = DID_OK << 16;
1970                 } else {
1971                         /* Transport status is good, SCSI status not good */
1972                         BNX2FC_IO_DBG(io_req, "scsi_cmpl: cdb_status = %d"
1973                                  " fcp_resid = 0x%x\n",
1974                                 io_req->cdb_status, io_req->fcp_resid);
1975                         sc_cmd->result = (DID_OK << 16) | io_req->cdb_status;
1976
1977                         if (io_req->cdb_status == SAM_STAT_TASK_SET_FULL ||
1978                             io_req->cdb_status == SAM_STAT_BUSY) {
1979                                 /* Set the jiffies + retry_delay_timer * 100ms
1980                                    for the rport/tgt */
1981                                 tgt->retry_delay_timestamp = jiffies +
1982                                         fcp_rsp->retry_delay_timer * HZ / 10;
1983                         }
1984
1985                 }
1986                 if (io_req->fcp_resid)
1987                         scsi_set_resid(sc_cmd, io_req->fcp_resid);
1988                 break;
1989         default:
1990                 printk(KERN_ERR PFX "scsi_cmd_compl: fcp_status = %d\n",
1991                         io_req->fcp_status);
1992                 break;
1993         }
1994         sc_cmd->SCp.ptr = NULL;
1995         sc_cmd->scsi_done(sc_cmd);
1996         kref_put(&io_req->refcount, bnx2fc_cmd_release);
1997 }
1998
1999 int bnx2fc_post_io_req(struct bnx2fc_rport *tgt,
2000                                struct bnx2fc_cmd *io_req)
2001 {
2002         struct fcoe_task_ctx_entry *task;
2003         struct fcoe_task_ctx_entry *task_page;
2004         struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
2005         struct fcoe_port *port = tgt->port;
2006         struct bnx2fc_interface *interface = port->priv;
2007         struct bnx2fc_hba *hba = interface->hba;
2008         struct fc_lport *lport = port->lport;
2009         struct fc_stats *stats;
2010         int task_idx, index;
2011         u16 xid;
2012
2013         /* bnx2fc_post_io_req() is called with the tgt_lock held */
2014
2015         /* Initialize rest of io_req fields */
2016         io_req->cmd_type = BNX2FC_SCSI_CMD;
2017         io_req->port = port;
2018         io_req->tgt = tgt;
2019         io_req->data_xfer_len = scsi_bufflen(sc_cmd);
2020         sc_cmd->SCp.ptr = (char *)io_req;
2021
2022         stats = per_cpu_ptr(lport->stats, get_cpu());
2023         if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE) {
2024                 io_req->io_req_flags = BNX2FC_READ;
2025                 stats->InputRequests++;
2026                 stats->InputBytes += io_req->data_xfer_len;
2027         } else if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) {
2028                 io_req->io_req_flags = BNX2FC_WRITE;
2029                 stats->OutputRequests++;
2030                 stats->OutputBytes += io_req->data_xfer_len;
2031         } else {
2032                 io_req->io_req_flags = 0;
2033                 stats->ControlRequests++;
2034         }
2035         put_cpu();
2036
2037         xid = io_req->xid;
2038
2039         /* Build buffer descriptor list for firmware from sg list */
2040         if (bnx2fc_build_bd_list_from_sg(io_req)) {
2041                 printk(KERN_ERR PFX "BD list creation failed\n");
2042                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
2043                 return -EAGAIN;
2044         }
2045
2046         task_idx = xid / BNX2FC_TASKS_PER_PAGE;
2047         index = xid % BNX2FC_TASKS_PER_PAGE;
2048
2049         /* Initialize task context for this IO request */
2050         task_page = (struct fcoe_task_ctx_entry *) hba->task_ctx[task_idx];
2051         task = &(task_page[index]);
2052         bnx2fc_init_task(io_req, task);
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                 return -EAGAIN;
2058         }
2059
2060         if (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags)) {
2061                 printk(KERN_ERR PFX "Session not ready...post_io\n");
2062                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
2063                 return -EAGAIN;
2064         }
2065
2066         /* Time IO req */
2067         if (tgt->io_timeout)
2068                 bnx2fc_cmd_timer_set(io_req, BNX2FC_IO_TIMEOUT);
2069         /* Obtain free SQ entry */
2070         bnx2fc_add_2_sq(tgt, xid);
2071
2072         /* Enqueue the io_req to active_cmd_queue */
2073
2074         io_req->on_active_queue = 1;
2075         /* move io_req from pending_queue to active_queue */
2076         list_add_tail(&io_req->link, &tgt->active_cmd_queue);
2077
2078         /* Ring doorbell */
2079         bnx2fc_ring_doorbell(tgt);
2080         return 0;
2081 }