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 - 2011 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                                                 u16 min_xid, u16 max_xid)
 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
 256         if (max_xid <= min_xid || max_xid == FC_XID_UNKNOWN) {
 257                 printk(KERN_ERR PFX "cmd_mgr_alloc: Invalid min_xid 0x%x \
 258                                         and max_xid 0x%x\n", min_xid, max_xid);
 259                 return NULL;
 260         }
 261         BNX2FC_MISC_DBG("min xid 0x%x, max xid 0x%x\n", min_xid, max_xid);
 262
 263         num_ios = max_xid - min_xid + 1;
 264         len = (num_ios * (sizeof(struct bnx2fc_cmd *)));
 265         len += sizeof(struct bnx2fc_cmd_mgr);
 266
 267         cmgr = kzalloc(len, GFP_KERNEL);
 268         if (!cmgr) {
 269                 printk(KERN_ERR PFX "failed to alloc cmgr\n");
 270                 return NULL;
 271         }
 272
 273         cmgr->free_list = kzalloc(sizeof(*cmgr->free_list) *
 274                                   arr_sz, GFP_KERNEL);
 275         if (!cmgr->free_list) {
 276                 printk(KERN_ERR PFX "failed to alloc free_list\n");
 277                 goto mem_err;
 278         }
 279
 280         cmgr->free_list_lock = kzalloc(sizeof(*cmgr->free_list_lock) *
 281                                        arr_sz, GFP_KERNEL);
 282         if (!cmgr->free_list_lock) {
 283                 printk(KERN_ERR PFX "failed to alloc free_list_lock\n");
 284                 goto mem_err;
 285         }
 286
 287         cmgr->hba = hba;
 288         cmgr->cmds = (struct bnx2fc_cmd **)(cmgr + 1);
 289
 290         for (i = 0; i < arr_sz; i++)  {
 291                 INIT_LIST_HEAD(&cmgr->free_list[i]);
 292                 spin_lock_init(&cmgr->free_list_lock[i]);
 293         }
 294
 295         /*
 296          * Pre-allocated pool of bnx2fc_cmds.
 297          * Last entry in the free list array is the free list
 298          * of slow path requests.
 299          */
 300         xid = BNX2FC_MIN_XID;
 301         num_pri_ios = num_ios - BNX2FC_ELSTM_XIDS;
 302         for (i = 0; i < num_ios; i++) {
 303                 io_req = kzalloc(sizeof(*io_req), GFP_KERNEL);
 304
 305                 if (!io_req) {
 306                         printk(KERN_ERR PFX "failed to alloc io_req\n");
 307                         goto mem_err;
 308                 }
 309
 310                 INIT_LIST_HEAD(&io_req->link);
 311                 INIT_DELAYED_WORK(&io_req->timeout_work, bnx2fc_cmd_timeout);
 312
 313                 io_req->xid = xid++;
 314                 if (i < num_pri_ios)
 315                         list_add_tail(&io_req->link,
 316                                 &cmgr->free_list[io_req->xid %
 317                                                  num_possible_cpus()]);
 318                 else
 319                         list_add_tail(&io_req->link,
 320                                 &cmgr->free_list[num_possible_cpus()]);
 321                 io_req++;
 322         }
 323
 324         /* Allocate pool of io_bdts - one for each bnx2fc_cmd */
 325         mem_size = num_ios * sizeof(struct io_bdt *);
 326         cmgr->io_bdt_pool = kmalloc(mem_size, GFP_KERNEL);
 327         if (!cmgr->io_bdt_pool) {
 328                 printk(KERN_ERR PFX "failed to alloc io_bdt_pool\n");
 329                 goto mem_err;
 330         }
 331
 332         mem_size = sizeof(struct io_bdt);
 333         for (i = 0; i < num_ios; i++) {
 334                 cmgr->io_bdt_pool[i] = kmalloc(mem_size, GFP_KERNEL);
 335                 if (!cmgr->io_bdt_pool[i]) {
 336                         printk(KERN_ERR PFX "failed to alloc "
 337                                 "io_bdt_pool[%d]\n", i);
 338                         goto mem_err;
 339                 }
 340         }
 341
 342         /* Allocate an map fcoe_bdt_ctx structures */
 343         bd_tbl_sz = BNX2FC_MAX_BDS_PER_CMD * sizeof(struct fcoe_bd_ctx);
 344         for (i = 0; i < num_ios; i++) {
 345                 bdt_info = cmgr->io_bdt_pool[i];
 346                 bdt_info->bd_tbl = dma_alloc_coherent(&hba->pcidev->dev,
 347                                                       bd_tbl_sz,
 348                                                       &bdt_info->bd_tbl_dma,
 349                                                       GFP_KERNEL);
 350                 if (!bdt_info->bd_tbl) {
 351                         printk(KERN_ERR PFX "failed to alloc "
 352                                 "bdt_tbl[%d]\n", i);
 353                         goto mem_err;
 354                 }
 355         }
 356
 357         return cmgr;
 358
 359 mem_err:
 360         bnx2fc_cmd_mgr_free(cmgr);
 361         return NULL;
 362 }
 363
 364 void bnx2fc_cmd_mgr_free(struct bnx2fc_cmd_mgr *cmgr)
 365 {
 366         struct io_bdt *bdt_info;
 367         struct bnx2fc_hba *hba = cmgr->hba;
 368         size_t bd_tbl_sz;
 369         u16 min_xid = BNX2FC_MIN_XID;
 370         u16 max_xid = BNX2FC_MAX_XID;
 371         int num_ios;
 372         int i;
 373
 374         num_ios = max_xid - min_xid + 1;
 375
 376         /* Free fcoe_bdt_ctx structures */
 377         if (!cmgr->io_bdt_pool)
 378                 goto free_cmd_pool;
 379
 380         bd_tbl_sz = BNX2FC_MAX_BDS_PER_CMD * sizeof(struct fcoe_bd_ctx);
 381         for (i = 0; i < num_ios; i++) {
 382                 bdt_info = cmgr->io_bdt_pool[i];
 383                 if (bdt_info->bd_tbl) {
 384                         dma_free_coherent(&hba->pcidev->dev, bd_tbl_sz,
 385                                             bdt_info->bd_tbl,
 386                                             bdt_info->bd_tbl_dma);
 387                         bdt_info->bd_tbl = NULL;
 388                 }
 389         }
 390
 391         /* Destroy io_bdt pool */
 392         for (i = 0; i < num_ios; i++) {
 393                 kfree(cmgr->io_bdt_pool[i]);
 394                 cmgr->io_bdt_pool[i] = NULL;
 395         }
 396
 397         kfree(cmgr->io_bdt_pool);
 398         cmgr->io_bdt_pool = NULL;
 399
 400 free_cmd_pool:
 401         kfree(cmgr->free_list_lock);
 402
 403         /* Destroy cmd pool */
 404         if (!cmgr->free_list)
 405                 goto free_cmgr;
 406
 407         for (i = 0; i < num_possible_cpus() + 1; i++)  {
 408                 struct list_head *list;
 409                 struct list_head *tmp;
 410
 411                 list_for_each_safe(list, tmp, &cmgr->free_list[i]) {
 412                         struct bnx2fc_cmd *io_req = (struct bnx2fc_cmd *)list;
 413                         list_del(&io_req->link);
 414                         kfree(io_req);
 415                 }
 416         }
 417         kfree(cmgr->free_list);
 418 free_cmgr:
 419         /* Free command manager itself */
 420         kfree(cmgr);
 421 }
 422
 423 struct bnx2fc_cmd *bnx2fc_elstm_alloc(struct bnx2fc_rport *tgt, int type)
 424 {
 425         struct fcoe_port *port = tgt->port;
 426         struct bnx2fc_interface *interface = port->priv;
 427         struct bnx2fc_cmd_mgr *cmd_mgr = interface->hba->cmd_mgr;
 428         struct bnx2fc_cmd *io_req;
 429         struct list_head *listp;
 430         struct io_bdt *bd_tbl;
 431         int index = RESERVE_FREE_LIST_INDEX;
 432         u32 free_sqes;
 433         u32 max_sqes;
 434         u16 xid;
 435
 436         max_sqes = tgt->max_sqes;
 437         switch (type) {
 438         case BNX2FC_TASK_MGMT_CMD:
 439                 max_sqes = BNX2FC_TM_MAX_SQES;
 440                 break;
 441         case BNX2FC_ELS:
 442                 max_sqes = BNX2FC_ELS_MAX_SQES;
 443                 break;
 444         default:
 445                 break;
 446         }
 447
 448         /*
 449          * NOTE: Free list insertions and deletions are protected with
 450          * cmgr lock
 451          */
 452         spin_lock_bh(&cmd_mgr->free_list_lock[index]);
 453         free_sqes = atomic_read(&tgt->free_sqes);
 454         if ((list_empty(&(cmd_mgr->free_list[index]))) ||
 455             (tgt->num_active_ios.counter  >= max_sqes) ||
 456             (free_sqes + max_sqes <= BNX2FC_SQ_WQES_MAX)) {
 457                 BNX2FC_TGT_DBG(tgt, "No free els_tm cmds available "
 458                         "ios(%d):sqes(%d)\n",
 459                         tgt->num_active_ios.counter, tgt->max_sqes);
 460                 if (list_empty(&(cmd_mgr->free_list[index])))
 461                         printk(KERN_ERR PFX "elstm_alloc: list_empty\n");
 462                 spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
 463                 return NULL;
 464         }
 465
 466         listp = (struct list_head *)
 467                         cmd_mgr->free_list[index].next;
 468         list_del_init(listp);
 469         io_req = (struct bnx2fc_cmd *) listp;
 470         xid = io_req->xid;
 471         cmd_mgr->cmds[xid] = io_req;
 472         atomic_inc(&tgt->num_active_ios);
 473         atomic_dec(&tgt->free_sqes);
 474         spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
 475
 476         INIT_LIST_HEAD(&io_req->link);
 477
 478         io_req->port = port;
 479         io_req->cmd_mgr = cmd_mgr;
 480         io_req->req_flags = 0;
 481         io_req->cmd_type = type;
 482
 483         /* Bind io_bdt for this io_req */
 484         /* Have a static link between io_req and io_bdt_pool */
 485         bd_tbl = io_req->bd_tbl = cmd_mgr->io_bdt_pool[xid];
 486         bd_tbl->io_req = io_req;
 487
 488         /* Hold the io_req  against deletion */
 489         kref_init(&io_req->refcount);
 490         return io_req;
 491 }
 492
 493 struct bnx2fc_cmd *bnx2fc_cmd_alloc(struct bnx2fc_rport *tgt)
 494 {
 495         struct fcoe_port *port = tgt->port;
 496         struct bnx2fc_interface *interface = port->priv;
 497         struct bnx2fc_cmd_mgr *cmd_mgr = interface->hba->cmd_mgr;
 498         struct bnx2fc_cmd *io_req;
 499         struct list_head *listp;
 500         struct io_bdt *bd_tbl;
 501         u32 free_sqes;
 502         u32 max_sqes;
 503         u16 xid;
 504         int index = get_cpu();
 505
 506         max_sqes = BNX2FC_SCSI_MAX_SQES;
 507         /*
 508          * NOTE: Free list insertions and deletions are protected with
 509          * cmgr lock
 510          */
 511         spin_lock_bh(&cmd_mgr->free_list_lock[index]);
 512         free_sqes = atomic_read(&tgt->free_sqes);
 513         if ((list_empty(&cmd_mgr->free_list[index])) ||
 514             (tgt->num_active_ios.counter  >= max_sqes) ||
 515             (free_sqes + max_sqes <= BNX2FC_SQ_WQES_MAX)) {
 516                 spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
 517                 put_cpu();
 518                 return NULL;
 519         }
 520
 521         listp = (struct list_head *)
 522                 cmd_mgr->free_list[index].next;
 523         list_del_init(listp);
 524         io_req = (struct bnx2fc_cmd *) listp;
 525         xid = io_req->xid;
 526         cmd_mgr->cmds[xid] = io_req;
 527         atomic_inc(&tgt->num_active_ios);
 528         atomic_dec(&tgt->free_sqes);
 529         spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
 530         put_cpu();
 531
 532         INIT_LIST_HEAD(&io_req->link);
 533
 534         io_req->port = port;
 535         io_req->cmd_mgr = cmd_mgr;
 536         io_req->req_flags = 0;
 537
 538         /* Bind io_bdt for this io_req */
 539         /* Have a static link between io_req and io_bdt_pool */
 540         bd_tbl = io_req->bd_tbl = cmd_mgr->io_bdt_pool[xid];
 541         bd_tbl->io_req = io_req;
 542
 543         /* Hold the io_req  against deletion */
 544         kref_init(&io_req->refcount);
 545         return io_req;
 546 }
 547
 548 void bnx2fc_cmd_release(struct kref *ref)
 549 {
 550         struct bnx2fc_cmd *io_req = container_of(ref,
 551                                                 struct bnx2fc_cmd, refcount);
 552         struct bnx2fc_cmd_mgr *cmd_mgr = io_req->cmd_mgr;
 553         int index;
 554
 555         if (io_req->cmd_type == BNX2FC_SCSI_CMD)
 556                 index = io_req->xid % num_possible_cpus();
 557         else
 558                 index = RESERVE_FREE_LIST_INDEX;
 559
 560
 561         spin_lock_bh(&cmd_mgr->free_list_lock[index]);
 562         if (io_req->cmd_type != BNX2FC_SCSI_CMD)
 563                 bnx2fc_free_mp_resc(io_req);
 564         cmd_mgr->cmds[io_req->xid] = NULL;
 565         /* Delete IO from retire queue */
 566         list_del_init(&io_req->link);
 567         /* Add it to the free list */
 568         list_add(&io_req->link,
 569                         &cmd_mgr->free_list[index]);
 570         atomic_dec(&io_req->tgt->num_active_ios);
 571         spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
 572
 573 }
 574
 575 static void bnx2fc_free_mp_resc(struct bnx2fc_cmd *io_req)
 576 {
 577         struct bnx2fc_mp_req *mp_req = &(io_req->mp_req);
 578         struct bnx2fc_interface *interface = io_req->port->priv;
 579         struct bnx2fc_hba *hba = interface->hba;
 580         size_t sz = sizeof(struct fcoe_bd_ctx);
 581
 582         /* clear tm flags */
 583         mp_req->tm_flags = 0;
 584         if (mp_req->mp_req_bd) {
 585                 dma_free_coherent(&hba->pcidev->dev, sz,
 586                                      mp_req->mp_req_bd,
 587                                      mp_req->mp_req_bd_dma);
 588                 mp_req->mp_req_bd = NULL;
 589         }
 590         if (mp_req->mp_resp_bd) {
 591                 dma_free_coherent(&hba->pcidev->dev, sz,
 592                                      mp_req->mp_resp_bd,
 593                                      mp_req->mp_resp_bd_dma);
 594                 mp_req->mp_resp_bd = NULL;
 595         }
 596         if (mp_req->req_buf) {
 597                 dma_free_coherent(&hba->pcidev->dev, PAGE_SIZE,
 598                                      mp_req->req_buf,
 599                                      mp_req->req_buf_dma);
 600                 mp_req->req_buf = NULL;
 601         }
 602         if (mp_req->resp_buf) {
 603                 dma_free_coherent(&hba->pcidev->dev, PAGE_SIZE,
 604                                      mp_req->resp_buf,
 605                                      mp_req->resp_buf_dma);
 606                 mp_req->resp_buf = NULL;
 607         }
 608 }
 609
 610 int bnx2fc_init_mp_req(struct bnx2fc_cmd *io_req)
 611 {
 612         struct bnx2fc_mp_req *mp_req;
 613         struct fcoe_bd_ctx *mp_req_bd;
 614         struct fcoe_bd_ctx *mp_resp_bd;
 615         struct bnx2fc_interface *interface = io_req->port->priv;
 616         struct bnx2fc_hba *hba = interface->hba;
 617         dma_addr_t addr;
 618         size_t sz;
 619
 620         mp_req = (struct bnx2fc_mp_req *)&(io_req->mp_req);
 621         memset(mp_req, 0, sizeof(struct bnx2fc_mp_req));
 622
 623         mp_req->req_len = sizeof(struct fcp_cmnd);
 624         io_req->data_xfer_len = mp_req->req_len;
 625         mp_req->req_buf = dma_alloc_coherent(&hba->pcidev->dev, PAGE_SIZE,
 626                                              &mp_req->req_buf_dma,
 627                                              GFP_ATOMIC);
 628         if (!mp_req->req_buf) {
 629                 printk(KERN_ERR PFX "unable to alloc MP req buffer\n");
 630                 bnx2fc_free_mp_resc(io_req);
 631                 return FAILED;
 632         }
 633
 634         mp_req->resp_buf = dma_alloc_coherent(&hba->pcidev->dev, PAGE_SIZE,
 635                                               &mp_req->resp_buf_dma,
 636                                               GFP_ATOMIC);
 637         if (!mp_req->resp_buf) {
 638                 printk(KERN_ERR PFX "unable to alloc TM resp buffer\n");
 639                 bnx2fc_free_mp_resc(io_req);
 640                 return FAILED;
 641         }
 642         memset(mp_req->req_buf, 0, PAGE_SIZE);
 643         memset(mp_req->resp_buf, 0, PAGE_SIZE);
 644
 645         /* Allocate and map mp_req_bd and mp_resp_bd */
 646         sz = sizeof(struct fcoe_bd_ctx);
 647         mp_req->mp_req_bd = dma_alloc_coherent(&hba->pcidev->dev, sz,
 648                                                  &mp_req->mp_req_bd_dma,
 649                                                  GFP_ATOMIC);
 650         if (!mp_req->mp_req_bd) {
 651                 printk(KERN_ERR PFX "unable to alloc MP req bd\n");
 652                 bnx2fc_free_mp_resc(io_req);
 653                 return FAILED;
 654         }
 655         mp_req->mp_resp_bd = dma_alloc_coherent(&hba->pcidev->dev, sz,
 656                                                  &mp_req->mp_resp_bd_dma,
 657                                                  GFP_ATOMIC);
 658         if (!mp_req->mp_req_bd) {
 659                 printk(KERN_ERR PFX "unable to alloc MP resp bd\n");
 660                 bnx2fc_free_mp_resc(io_req);
 661                 return FAILED;
 662         }
 663         /* Fill bd table */
 664         addr = mp_req->req_buf_dma;
 665         mp_req_bd = mp_req->mp_req_bd;
 666         mp_req_bd->buf_addr_lo = (u32)addr & 0xffffffff;
 667         mp_req_bd->buf_addr_hi = (u32)((u64)addr >> 32);
 668         mp_req_bd->buf_len = PAGE_SIZE;
 669         mp_req_bd->flags = 0;
 670
 671         /*
 672          * MP buffer is either a task mgmt command or an ELS.
 673          * So the assumption is that it consumes a single bd
 674          * entry in the bd table
 675          */
 676         mp_resp_bd = mp_req->mp_resp_bd;
 677         addr = mp_req->resp_buf_dma;
 678         mp_resp_bd->buf_addr_lo = (u32)addr & 0xffffffff;
 679         mp_resp_bd->buf_addr_hi = (u32)((u64)addr >> 32);
 680         mp_resp_bd->buf_len = PAGE_SIZE;
 681         mp_resp_bd->flags = 0;
 682
 683         return SUCCESS;
 684 }
 685
 686 static int bnx2fc_initiate_tmf(struct scsi_cmnd *sc_cmd, u8 tm_flags)
 687 {
 688         struct fc_lport *lport;
 689         struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
 690         struct fc_rport_libfc_priv *rp = rport->dd_data;
 691         struct fcoe_port *port;
 692         struct bnx2fc_interface *interface;
 693         struct bnx2fc_rport *tgt;
 694         struct bnx2fc_cmd *io_req;
 695         struct bnx2fc_mp_req *tm_req;
 696         struct fcoe_task_ctx_entry *task;
 697         struct fcoe_task_ctx_entry *task_page;
 698         struct Scsi_Host *host = sc_cmd->device->host;
 699         struct fc_frame_header *fc_hdr;
 700         struct fcp_cmnd *fcp_cmnd;
 701         int task_idx, index;
 702         int rc = SUCCESS;
 703         u16 xid;
 704         u32 sid, did;
 705         unsigned long start = jiffies;
 706
 707         lport = shost_priv(host);
 708         port = lport_priv(lport);
 709         interface = port->priv;
 710
 711         if (rport == NULL) {
 712                 printk(KERN_ERR PFX "device_reset: rport is NULL\n");
 713                 rc = FAILED;
 714                 goto tmf_err;
 715         }
 716
 717         rc = fc_block_scsi_eh(sc_cmd);
 718         if (rc)
 719                 return rc;
 720
 721         if (lport->state != LPORT_ST_READY || !(lport->link_up)) {
 722                 printk(KERN_ERR PFX "device_reset: link is not ready\n");
 723                 rc = FAILED;
 724                 goto tmf_err;
 725         }
 726         /* rport and tgt are allocated together, so tgt should be non-NULL */
 727         tgt = (struct bnx2fc_rport *)&rp[1];
 728
 729         if (!(test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags))) {
 730                 printk(KERN_ERR PFX "device_reset: tgt not offloaded\n");
 731                 rc = FAILED;
 732                 goto tmf_err;
 733         }
 734 retry_tmf:
 735         io_req = bnx2fc_elstm_alloc(tgt, BNX2FC_TASK_MGMT_CMD);
 736         if (!io_req) {
 737                 if (time_after(jiffies, start + HZ)) {
 738                         printk(KERN_ERR PFX "tmf: Failed TMF");
 739                         rc = FAILED;
 740                         goto tmf_err;
 741                 }
 742                 msleep(20);
 743                 goto retry_tmf;
 744         }
 745         /* Initialize rest of io_req fields */
 746         io_req->sc_cmd = sc_cmd;
 747         io_req->port = port;
 748         io_req->tgt = tgt;
 749
 750         tm_req = (struct bnx2fc_mp_req *)&(io_req->mp_req);
 751
 752         rc = bnx2fc_init_mp_req(io_req);
 753         if (rc == FAILED) {
 754                 printk(KERN_ERR PFX "Task mgmt MP request init failed\n");
 755                 spin_lock_bh(&tgt->tgt_lock);
 756                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
 757                 spin_unlock_bh(&tgt->tgt_lock);
 758                 goto tmf_err;
 759         }
 760
 761         /* Set TM flags */
 762         io_req->io_req_flags = 0;
 763         tm_req->tm_flags = tm_flags;
 764
 765         /* Fill FCP_CMND */
 766         bnx2fc_build_fcp_cmnd(io_req, (struct fcp_cmnd *)tm_req->req_buf);
 767         fcp_cmnd = (struct fcp_cmnd *)tm_req->req_buf;
 768         memset(fcp_cmnd->fc_cdb, 0,  sc_cmd->cmd_len);
 769         fcp_cmnd->fc_dl = 0;
 770
 771         /* Fill FC header */
 772         fc_hdr = &(tm_req->req_fc_hdr);
 773         sid = tgt->sid;
 774         did = rport->port_id;
 775         __fc_fill_fc_hdr(fc_hdr, FC_RCTL_DD_UNSOL_CMD, did, sid,
 776                            FC_TYPE_FCP, FC_FC_FIRST_SEQ | FC_FC_END_SEQ |
 777                            FC_FC_SEQ_INIT, 0);
 778         /* Obtain exchange id */
 779         xid = io_req->xid;
 780
 781         BNX2FC_TGT_DBG(tgt, "Initiate TMF - xid = 0x%x\n", xid);
 782         task_idx = xid/BNX2FC_TASKS_PER_PAGE;
 783         index = xid % BNX2FC_TASKS_PER_PAGE;
 784
 785         /* Initialize task context for this IO request */
 786         task_page = (struct fcoe_task_ctx_entry *)
 787                         interface->hba->task_ctx[task_idx];
 788         task = &(task_page[index]);
 789         bnx2fc_init_mp_task(io_req, task);
 790
 791         sc_cmd->SCp.ptr = (char *)io_req;
 792
 793         /* Obtain free SQ entry */
 794         spin_lock_bh(&tgt->tgt_lock);
 795         bnx2fc_add_2_sq(tgt, xid);
 796
 797         /* Enqueue the io_req to active_tm_queue */
 798         io_req->on_tmf_queue = 1;
 799         list_add_tail(&io_req->link, &tgt->active_tm_queue);
 800
 801         init_completion(&io_req->tm_done);
 802         io_req->wait_for_comp = 1;
 803
 804         /* Ring doorbell */
 805         bnx2fc_ring_doorbell(tgt);
 806         spin_unlock_bh(&tgt->tgt_lock);
 807
 808         rc = wait_for_completion_timeout(&io_req->tm_done,
 809                                          BNX2FC_TM_TIMEOUT * HZ);
 810         spin_lock_bh(&tgt->tgt_lock);
 811
 812         io_req->wait_for_comp = 0;
 813         if (!(test_bit(BNX2FC_FLAG_TM_COMPL, &io_req->req_flags)))
 814                 set_bit(BNX2FC_FLAG_TM_TIMEOUT, &io_req->req_flags);
 815
 816         spin_unlock_bh(&tgt->tgt_lock);
 817
 818         if (!rc) {
 819                 BNX2FC_TGT_DBG(tgt, "task mgmt command failed...\n");
 820                 rc = FAILED;
 821         } else {
 822                 BNX2FC_TGT_DBG(tgt, "task mgmt command success...\n");
 823                 rc = SUCCESS;
 824         }
 825 tmf_err:
 826         return rc;
 827 }
 828
 829 int bnx2fc_initiate_abts(struct bnx2fc_cmd *io_req)
 830 {
 831         struct fc_lport *lport;
 832         struct bnx2fc_rport *tgt = io_req->tgt;
 833         struct fc_rport *rport = tgt->rport;
 834         struct fc_rport_priv *rdata = tgt->rdata;
 835         struct bnx2fc_interface *interface;
 836         struct fcoe_port *port;
 837         struct bnx2fc_cmd *abts_io_req;
 838         struct fcoe_task_ctx_entry *task;
 839         struct fcoe_task_ctx_entry *task_page;
 840         struct fc_frame_header *fc_hdr;
 841         struct bnx2fc_mp_req *abts_req;
 842         int task_idx, index;
 843         u32 sid, did;
 844         u16 xid;
 845         int rc = SUCCESS;
 846         u32 r_a_tov = rdata->r_a_tov;
 847
 848         /* called with tgt_lock held */
 849         BNX2FC_IO_DBG(io_req, "Entered bnx2fc_initiate_abts\n");
 850
 851         port = io_req->port;
 852         interface = port->priv;
 853         lport = port->lport;
 854
 855         if (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags)) {
 856                 printk(KERN_ERR PFX "initiate_abts: tgt not offloaded\n");
 857                 rc = FAILED;
 858                 goto abts_err;
 859         }
 860
 861         if (rport == NULL) {
 862                 printk(KERN_ERR PFX "initiate_abts: rport is NULL\n");
 863                 rc = FAILED;
 864                 goto abts_err;
 865         }
 866
 867         if (lport->state != LPORT_ST_READY || !(lport->link_up)) {
 868                 printk(KERN_ERR PFX "initiate_abts: link is not ready\n");
 869                 rc = FAILED;
 870                 goto abts_err;
 871         }
 872
 873         abts_io_req = bnx2fc_elstm_alloc(tgt, BNX2FC_ABTS);
 874         if (!abts_io_req) {
 875                 printk(KERN_ERR PFX "abts: couldnt allocate cmd\n");
 876                 rc = FAILED;
 877                 goto abts_err;
 878         }
 879
 880         /* Initialize rest of io_req fields */
 881         abts_io_req->sc_cmd = NULL;
 882         abts_io_req->port = port;
 883         abts_io_req->tgt = tgt;
 884         abts_io_req->data_xfer_len = 0; /* No data transfer for ABTS */
 885
 886         abts_req = (struct bnx2fc_mp_req *)&(abts_io_req->mp_req);
 887         memset(abts_req, 0, sizeof(struct bnx2fc_mp_req));
 888
 889         /* Fill FC header */
 890         fc_hdr = &(abts_req->req_fc_hdr);
 891
 892         /* Obtain oxid and rxid for the original exchange to be aborted */
 893         fc_hdr->fh_ox_id = htons(io_req->xid);
 894         fc_hdr->fh_rx_id = htons(io_req->task->rxwr_txrd.var_ctx.rx_id);
 895
 896         sid = tgt->sid;
 897         did = rport->port_id;
 898
 899         __fc_fill_fc_hdr(fc_hdr, FC_RCTL_BA_ABTS, did, sid,
 900                            FC_TYPE_BLS, FC_FC_FIRST_SEQ | FC_FC_END_SEQ |
 901                            FC_FC_SEQ_INIT, 0);
 902
 903         xid = abts_io_req->xid;
 904         BNX2FC_IO_DBG(abts_io_req, "ABTS io_req\n");
 905         task_idx = xid/BNX2FC_TASKS_PER_PAGE;
 906         index = xid % BNX2FC_TASKS_PER_PAGE;
 907
 908         /* Initialize task context for this IO request */
 909         task_page = (struct fcoe_task_ctx_entry *)
 910                         interface->hba->task_ctx[task_idx];
 911         task = &(task_page[index]);
 912         bnx2fc_init_mp_task(abts_io_req, task);
 913
 914         /*
 915          * ABTS task is a temporary task that will be cleaned up
 916          * irrespective of ABTS response. We need to start the timer
 917          * for the original exchange, as the CQE is posted for the original
 918          * IO request.
 919          *
 920          * Timer for ABTS is started only when it is originated by a
 921          * TM request. For the ABTS issued as part of ULP timeout,
 922          * scsi-ml maintains the timers.
 923          */
 924
 925         /* if (test_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags))*/
 926         bnx2fc_cmd_timer_set(io_req, 2 * r_a_tov);
 927
 928         /* Obtain free SQ entry */
 929         bnx2fc_add_2_sq(tgt, xid);
 930
 931         /* Ring doorbell */
 932         bnx2fc_ring_doorbell(tgt);
 933
 934 abts_err:
 935         return rc;
 936 }
 937
 938 int bnx2fc_initiate_seq_cleanup(struct bnx2fc_cmd *orig_io_req, u32 offset,
 939                                 enum fc_rctl r_ctl)
 940 {
 941         struct fc_lport *lport;
 942         struct bnx2fc_rport *tgt = orig_io_req->tgt;
 943         struct bnx2fc_interface *interface;
 944         struct fcoe_port *port;
 945         struct bnx2fc_cmd *seq_clnp_req;
 946         struct fcoe_task_ctx_entry *task;
 947         struct fcoe_task_ctx_entry *task_page;
 948         struct bnx2fc_els_cb_arg *cb_arg = NULL;
 949         int task_idx, index;
 950         u16 xid;
 951         int rc = 0;
 952
 953         BNX2FC_IO_DBG(orig_io_req, "bnx2fc_initiate_seq_cleanup xid = 0x%x\n",
 954                    orig_io_req->xid);
 955         kref_get(&orig_io_req->refcount);
 956
 957         port = orig_io_req->port;
 958         interface = port->priv;
 959         lport = port->lport;
 960
 961         cb_arg = kzalloc(sizeof(struct bnx2fc_els_cb_arg), GFP_ATOMIC);
 962         if (!cb_arg) {
 963                 printk(KERN_ERR PFX "Unable to alloc cb_arg for seq clnup\n");
 964                 rc = -ENOMEM;
 965                 goto cleanup_err;
 966         }
 967
 968         seq_clnp_req = bnx2fc_elstm_alloc(tgt, BNX2FC_SEQ_CLEANUP);
 969         if (!seq_clnp_req) {
 970                 printk(KERN_ERR PFX "cleanup: couldnt allocate cmd\n");
 971                 rc = -ENOMEM;
 972                 kfree(cb_arg);
 973                 goto cleanup_err;
 974         }
 975         /* Initialize rest of io_req fields */
 976         seq_clnp_req->sc_cmd = NULL;
 977         seq_clnp_req->port = port;
 978         seq_clnp_req->tgt = tgt;
 979         seq_clnp_req->data_xfer_len = 0; /* No data transfer for cleanup */
 980
 981         xid = seq_clnp_req->xid;
 982
 983         task_idx = xid/BNX2FC_TASKS_PER_PAGE;
 984         index = xid % BNX2FC_TASKS_PER_PAGE;
 985
 986         /* Initialize task context for this IO request */
 987         task_page = (struct fcoe_task_ctx_entry *)
 988                      interface->hba->task_ctx[task_idx];
 989         task = &(task_page[index]);
 990         cb_arg->aborted_io_req = orig_io_req;
 991         cb_arg->io_req = seq_clnp_req;
 992         cb_arg->r_ctl = r_ctl;
 993         cb_arg->offset = offset;
 994         seq_clnp_req->cb_arg = cb_arg;
 995
 996         printk(KERN_ERR PFX "call init_seq_cleanup_task\n");
 997         bnx2fc_init_seq_cleanup_task(seq_clnp_req, task, orig_io_req, offset);
 998
 999         /* Obtain free SQ entry */
1000         bnx2fc_add_2_sq(tgt, xid);
1001
1002         /* Ring doorbell */
1003         bnx2fc_ring_doorbell(tgt);
1004 cleanup_err:
1005         return rc;
1006 }
1007
1008 int bnx2fc_initiate_cleanup(struct bnx2fc_cmd *io_req)
1009 {
1010         struct fc_lport *lport;
1011         struct bnx2fc_rport *tgt = io_req->tgt;
1012         struct bnx2fc_interface *interface;
1013         struct fcoe_port *port;
1014         struct bnx2fc_cmd *cleanup_io_req;
1015         struct fcoe_task_ctx_entry *task;
1016         struct fcoe_task_ctx_entry *task_page;
1017         int task_idx, index;
1018         u16 xid, orig_xid;
1019         int rc = 0;
1020
1021         /* ASSUMPTION: called with tgt_lock held */
1022         BNX2FC_IO_DBG(io_req, "Entered bnx2fc_initiate_cleanup\n");
1023
1024         port = io_req->port;
1025         interface = port->priv;
1026         lport = port->lport;
1027
1028         cleanup_io_req = bnx2fc_elstm_alloc(tgt, BNX2FC_CLEANUP);
1029         if (!cleanup_io_req) {
1030                 printk(KERN_ERR PFX "cleanup: couldnt allocate cmd\n");
1031                 rc = -1;
1032                 goto cleanup_err;
1033         }
1034
1035         /* Initialize rest of io_req fields */
1036         cleanup_io_req->sc_cmd = NULL;
1037         cleanup_io_req->port = port;
1038         cleanup_io_req->tgt = tgt;
1039         cleanup_io_req->data_xfer_len = 0; /* No data transfer for cleanup */
1040
1041         xid = cleanup_io_req->xid;
1042
1043         task_idx = xid/BNX2FC_TASKS_PER_PAGE;
1044         index = xid % BNX2FC_TASKS_PER_PAGE;
1045
1046         /* Initialize task context for this IO request */
1047         task_page = (struct fcoe_task_ctx_entry *)
1048                         interface->hba->task_ctx[task_idx];
1049         task = &(task_page[index]);
1050         orig_xid = io_req->xid;
1051
1052         BNX2FC_IO_DBG(io_req, "CLEANUP io_req xid = 0x%x\n", xid);
1053
1054         bnx2fc_init_cleanup_task(cleanup_io_req, task, orig_xid);
1055
1056         /* Obtain free SQ entry */
1057         bnx2fc_add_2_sq(tgt, xid);
1058
1059         /* Ring doorbell */
1060         bnx2fc_ring_doorbell(tgt);
1061
1062 cleanup_err:
1063         return rc;
1064 }
1065
1066 /**
1067  * bnx2fc_eh_target_reset: Reset a target
1068  *
1069  * @sc_cmd:     SCSI command
1070  *
1071  * Set from SCSI host template to send task mgmt command to the target
1072  *      and wait for the response
1073  */
1074 int bnx2fc_eh_target_reset(struct scsi_cmnd *sc_cmd)
1075 {
1076         return bnx2fc_initiate_tmf(sc_cmd, FCP_TMF_TGT_RESET);
1077 }
1078
1079 /**
1080  * bnx2fc_eh_device_reset - Reset a single LUN
1081  *
1082  * @sc_cmd:     SCSI command
1083  *
1084  * Set from SCSI host template to send task mgmt command to the target
1085  *      and wait for the response
1086  */
1087 int bnx2fc_eh_device_reset(struct scsi_cmnd *sc_cmd)
1088 {
1089         return bnx2fc_initiate_tmf(sc_cmd, FCP_TMF_LUN_RESET);
1090 }
1091
1092 /**
1093  * bnx2fc_eh_abort - eh_abort_handler api to abort an outstanding
1094  *                      SCSI command
1095  *
1096  * @sc_cmd:     SCSI_ML command pointer
1097  *
1098  * SCSI abort request handler
1099  */
1100 int bnx2fc_eh_abort(struct scsi_cmnd *sc_cmd)
1101 {
1102         struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
1103         struct fc_rport_libfc_priv *rp = rport->dd_data;
1104         struct bnx2fc_cmd *io_req;
1105         struct fc_lport *lport;
1106         struct fc_rport_priv *rdata;
1107         struct bnx2fc_rport *tgt;
1108         int logo_issued;
1109         int wait_cnt = 0;
1110         int rc = FAILED;
1111
1112
1113         rc = fc_block_scsi_eh(sc_cmd);
1114         if (rc)
1115                 return rc;
1116
1117         lport = shost_priv(sc_cmd->device->host);
1118         if ((lport->state != LPORT_ST_READY) || !(lport->link_up)) {
1119                 printk(KERN_ERR PFX "eh_abort: link not ready\n");
1120                 return rc;
1121         }
1122
1123         tgt = (struct bnx2fc_rport *)&rp[1];
1124
1125         BNX2FC_TGT_DBG(tgt, "Entered bnx2fc_eh_abort\n");
1126
1127         spin_lock_bh(&tgt->tgt_lock);
1128         io_req = (struct bnx2fc_cmd *)sc_cmd->SCp.ptr;
1129         if (!io_req) {
1130                 /* Command might have just completed */
1131                 printk(KERN_ERR PFX "eh_abort: io_req is NULL\n");
1132                 spin_unlock_bh(&tgt->tgt_lock);
1133                 return SUCCESS;
1134         }
1135         BNX2FC_IO_DBG(io_req, "eh_abort - refcnt = %d\n",
1136                       io_req->refcount.refcount.counter);
1137
1138         /* Hold IO request across abort processing */
1139         kref_get(&io_req->refcount);
1140
1141         BUG_ON(tgt != io_req->tgt);
1142
1143         /* Remove the io_req from the active_q. */
1144         /*
1145          * Task Mgmt functions (LUN RESET & TGT RESET) will not
1146          * issue an ABTS on this particular IO req, as the
1147          * io_req is no longer in the active_q.
1148          */
1149         if (tgt->flush_in_prog) {
1150                 printk(KERN_ERR PFX "eh_abort: io_req (xid = 0x%x) "
1151                         "flush in progress\n", io_req->xid);
1152                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1153                 spin_unlock_bh(&tgt->tgt_lock);
1154                 return SUCCESS;
1155         }
1156
1157         if (io_req->on_active_queue == 0) {
1158                 printk(KERN_ERR PFX "eh_abort: io_req (xid = 0x%x) "
1159                                 "not on active_q\n", io_req->xid);
1160                 /*
1161                  * This condition can happen only due to the FW bug,
1162                  * where we do not receive cleanup response from
1163                  * the FW. Handle this case gracefully by erroring
1164                  * back the IO request to SCSI-ml
1165                  */
1166                 bnx2fc_scsi_done(io_req, DID_ABORT);
1167
1168                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1169                 spin_unlock_bh(&tgt->tgt_lock);
1170                 return SUCCESS;
1171         }
1172
1173         /*
1174          * Only eh_abort processing will remove the IO from
1175          * active_cmd_q before processing the request. this is
1176          * done to avoid race conditions between IOs aborted
1177          * as part of task management completion and eh_abort
1178          * processing
1179          */
1180         list_del_init(&io_req->link);
1181         io_req->on_active_queue = 0;
1182         /* Move IO req to retire queue */
1183         list_add_tail(&io_req->link, &tgt->io_retire_queue);
1184
1185         init_completion(&io_req->tm_done);
1186         io_req->wait_for_comp = 1;
1187
1188         if (!test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags)) {
1189                 /* Cancel the current timer running on this io_req */
1190                 if (cancel_delayed_work(&io_req->timeout_work))
1191                         kref_put(&io_req->refcount,
1192                                  bnx2fc_cmd_release); /* drop timer hold */
1193                 set_bit(BNX2FC_FLAG_EH_ABORT, &io_req->req_flags);
1194                 rc = bnx2fc_initiate_abts(io_req);
1195         } else {
1196                 printk(KERN_ERR PFX "eh_abort: io_req (xid = 0x%x) "
1197                                 "already in abts processing\n", io_req->xid);
1198                 if (cancel_delayed_work(&io_req->timeout_work))
1199                         kref_put(&io_req->refcount,
1200                                  bnx2fc_cmd_release); /* drop timer hold */
1201                 bnx2fc_initiate_cleanup(io_req);
1202
1203                 spin_unlock_bh(&tgt->tgt_lock);
1204
1205                 wait_for_completion(&io_req->tm_done);
1206
1207                 spin_lock_bh(&tgt->tgt_lock);
1208                 io_req->wait_for_comp = 0;
1209                 rdata = io_req->tgt->rdata;
1210                 logo_issued = test_and_set_bit(BNX2FC_FLAG_EXPL_LOGO,
1211                                                &tgt->flags);
1212                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1213                 spin_unlock_bh(&tgt->tgt_lock);
1214
1215                 if (!logo_issued) {
1216                         BNX2FC_IO_DBG(io_req, "Expl logo - tgt flags = 0x%lx\n",
1217                                       tgt->flags);
1218                         mutex_lock(&lport->disc.disc_mutex);
1219                         lport->tt.rport_logoff(rdata);
1220                         mutex_unlock(&lport->disc.disc_mutex);
1221                         do {
1222                                 msleep(BNX2FC_RELOGIN_WAIT_TIME);
1223                                 /*
1224                                  * If session not recovered, let SCSI-ml
1225                                  * escalate error recovery.
1226                                  */
1227                                 if (wait_cnt++ > BNX2FC_RELOGIN_WAIT_CNT)
1228                                         return FAILED;
1229                         } while (!test_bit(BNX2FC_FLAG_SESSION_READY,
1230                                            &tgt->flags));
1231                 }
1232                 return SUCCESS;
1233         }
1234         if (rc == FAILED) {
1235                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1236                 spin_unlock_bh(&tgt->tgt_lock);
1237                 return rc;
1238         }
1239         spin_unlock_bh(&tgt->tgt_lock);
1240
1241         wait_for_completion(&io_req->tm_done);
1242
1243         spin_lock_bh(&tgt->tgt_lock);
1244         io_req->wait_for_comp = 0;
1245         if (!(test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
1246                                     &io_req->req_flags))) {
1247                 /* Let the scsi-ml try to recover this command */
1248                 printk(KERN_ERR PFX "abort failed, xid = 0x%x\n",
1249                        io_req->xid);
1250                 rc = FAILED;
1251         } else {
1252                 /*
1253                  * We come here even when there was a race condition
1254                  * between timeout and abts completion, and abts
1255                  * completion happens just in time.
1256                  */
1257                 BNX2FC_IO_DBG(io_req, "abort succeeded\n");
1258                 rc = SUCCESS;
1259                 bnx2fc_scsi_done(io_req, DID_ABORT);
1260                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1261         }
1262
1263         /* release the reference taken in eh_abort */
1264         kref_put(&io_req->refcount, bnx2fc_cmd_release);
1265         spin_unlock_bh(&tgt->tgt_lock);
1266         return rc;
1267 }
1268
1269 void bnx2fc_process_seq_cleanup_compl(struct bnx2fc_cmd *seq_clnp_req,
1270                                       struct fcoe_task_ctx_entry *task,
1271                                       u8 rx_state)
1272 {
1273         struct bnx2fc_els_cb_arg *cb_arg = seq_clnp_req->cb_arg;
1274         struct bnx2fc_cmd *orig_io_req = cb_arg->aborted_io_req;
1275         u32 offset = cb_arg->offset;
1276         enum fc_rctl r_ctl = cb_arg->r_ctl;
1277         int rc = 0;
1278         struct bnx2fc_rport *tgt = orig_io_req->tgt;
1279
1280         BNX2FC_IO_DBG(orig_io_req, "Entered process_cleanup_compl xid = 0x%x"
1281                               "cmd_type = %d\n",
1282                    seq_clnp_req->xid, seq_clnp_req->cmd_type);
1283
1284         if (rx_state == FCOE_TASK_RX_STATE_IGNORED_SEQUENCE_CLEANUP) {
1285                 printk(KERN_ERR PFX "seq cleanup ignored - xid = 0x%x\n",
1286                         seq_clnp_req->xid);
1287                 goto free_cb_arg;
1288         }
1289
1290         spin_unlock_bh(&tgt->tgt_lock);
1291         rc = bnx2fc_send_srr(orig_io_req, offset, r_ctl);
1292         spin_lock_bh(&tgt->tgt_lock);
1293
1294         if (rc)
1295                 printk(KERN_ERR PFX "clnup_compl: Unable to send SRR"
1296                         " IO will abort\n");
1297         seq_clnp_req->cb_arg = NULL;
1298         kref_put(&orig_io_req->refcount, bnx2fc_cmd_release);
1299 free_cb_arg:
1300         kfree(cb_arg);
1301         return;
1302 }
1303
1304 void bnx2fc_process_cleanup_compl(struct bnx2fc_cmd *io_req,
1305                                   struct fcoe_task_ctx_entry *task,
1306                                   u8 num_rq)
1307 {
1308         BNX2FC_IO_DBG(io_req, "Entered process_cleanup_compl "
1309                               "refcnt = %d, cmd_type = %d\n",
1310                    io_req->refcount.refcount.counter, io_req->cmd_type);
1311         bnx2fc_scsi_done(io_req, DID_ERROR);
1312         kref_put(&io_req->refcount, bnx2fc_cmd_release);
1313         if (io_req->wait_for_comp)
1314                 complete(&io_req->tm_done);
1315 }
1316
1317 void bnx2fc_process_abts_compl(struct bnx2fc_cmd *io_req,
1318                                struct fcoe_task_ctx_entry *task,
1319                                u8 num_rq)
1320 {
1321         u32 r_ctl;
1322         u32 r_a_tov = FC_DEF_R_A_TOV;
1323         u8 issue_rrq = 0;
1324         struct bnx2fc_rport *tgt = io_req->tgt;
1325
1326         BNX2FC_IO_DBG(io_req, "Entered process_abts_compl xid = 0x%x"
1327                               "refcnt = %d, cmd_type = %d\n",
1328                    io_req->xid,
1329                    io_req->refcount.refcount.counter, io_req->cmd_type);
1330
1331         if (test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
1332                                        &io_req->req_flags)) {
1333                 BNX2FC_IO_DBG(io_req, "Timer context finished processing"
1334                                 " this io\n");
1335                 return;
1336         }
1337
1338         /* Do not issue RRQ as this IO is already cleanedup */
1339         if (test_and_set_bit(BNX2FC_FLAG_IO_CLEANUP,
1340                                 &io_req->req_flags))
1341                 goto io_compl;
1342
1343         /*
1344          * For ABTS issued due to SCSI eh_abort_handler, timeout
1345          * values are maintained by scsi-ml itself. Cancel timeout
1346          * in case ABTS issued as part of task management function
1347          * or due to FW error.
1348          */
1349         if (test_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags))
1350                 if (cancel_delayed_work(&io_req->timeout_work))
1351                         kref_put(&io_req->refcount,
1352                                  bnx2fc_cmd_release); /* drop timer hold */
1353
1354         r_ctl = (u8)task->rxwr_only.union_ctx.comp_info.abts_rsp.r_ctl;
1355
1356         switch (r_ctl) {
1357         case FC_RCTL_BA_ACC:
1358                 /*
1359                  * Dont release this cmd yet. It will be relesed
1360                  * after we get RRQ response
1361                  */
1362                 BNX2FC_IO_DBG(io_req, "ABTS response - ACC Send RRQ\n");
1363                 issue_rrq = 1;
1364                 break;
1365
1366         case FC_RCTL_BA_RJT:
1367                 BNX2FC_IO_DBG(io_req, "ABTS response - RJT\n");
1368                 break;
1369         default:
1370                 printk(KERN_ERR PFX "Unknown ABTS response\n");
1371                 break;
1372         }
1373
1374         if (issue_rrq) {
1375                 BNX2FC_IO_DBG(io_req, "Issue RRQ after R_A_TOV\n");
1376                 set_bit(BNX2FC_FLAG_ISSUE_RRQ, &io_req->req_flags);
1377         }
1378         set_bit(BNX2FC_FLAG_RETIRE_OXID, &io_req->req_flags);
1379         bnx2fc_cmd_timer_set(io_req, r_a_tov);
1380
1381 io_compl:
1382         if (io_req->wait_for_comp) {
1383                 if (test_and_clear_bit(BNX2FC_FLAG_EH_ABORT,
1384                                        &io_req->req_flags))
1385                         complete(&io_req->tm_done);
1386         } else {
1387                 /*
1388                  * We end up here when ABTS is issued as
1389                  * in asynchronous context, i.e., as part
1390                  * of task management completion, or
1391                  * when FW error is received or when the
1392                  * ABTS is issued when the IO is timed
1393                  * out.
1394                  */
1395
1396                 if (io_req->on_active_queue) {
1397                         list_del_init(&io_req->link);
1398                         io_req->on_active_queue = 0;
1399                         /* Move IO req to retire queue */
1400                         list_add_tail(&io_req->link, &tgt->io_retire_queue);
1401                 }
1402                 bnx2fc_scsi_done(io_req, DID_ERROR);
1403                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1404         }
1405 }
1406
1407 static void bnx2fc_lun_reset_cmpl(struct bnx2fc_cmd *io_req)
1408 {
1409         struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1410         struct bnx2fc_rport *tgt = io_req->tgt;
1411         struct list_head *list;
1412         struct list_head *tmp;
1413         struct bnx2fc_cmd *cmd;
1414         int tm_lun = sc_cmd->device->lun;
1415         int rc = 0;
1416         int lun;
1417
1418         /* called with tgt_lock held */
1419         BNX2FC_IO_DBG(io_req, "Entered bnx2fc_lun_reset_cmpl\n");
1420         /*
1421          * Walk thru the active_ios queue and ABORT the IO
1422          * that matches with the LUN that was reset
1423          */
1424         list_for_each_safe(list, tmp, &tgt->active_cmd_queue) {
1425                 BNX2FC_TGT_DBG(tgt, "LUN RST cmpl: scan for pending IOs\n");
1426                 cmd = (struct bnx2fc_cmd *)list;
1427                 lun = cmd->sc_cmd->device->lun;
1428                 if (lun == tm_lun) {
1429                         /* Initiate ABTS on this cmd */
1430                         if (!test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS,
1431                                               &cmd->req_flags)) {
1432                                 /* cancel the IO timeout */
1433                                 if (cancel_delayed_work(&io_req->timeout_work))
1434                                         kref_put(&io_req->refcount,
1435                                                  bnx2fc_cmd_release);
1436                                                         /* timer hold */
1437                                 rc = bnx2fc_initiate_abts(cmd);
1438                                 /* abts shouldn't fail in this context */
1439                                 WARN_ON(rc != SUCCESS);
1440                         } else
1441                                 printk(KERN_ERR PFX "lun_rst: abts already in"
1442                                         " progress for this IO 0x%x\n",
1443                                         cmd->xid);
1444                 }
1445         }
1446 }
1447
1448 static void bnx2fc_tgt_reset_cmpl(struct bnx2fc_cmd *io_req)
1449 {
1450         struct bnx2fc_rport *tgt = io_req->tgt;
1451         struct list_head *list;
1452         struct list_head *tmp;
1453         struct bnx2fc_cmd *cmd;
1454         int rc = 0;
1455
1456         /* called with tgt_lock held */
1457         BNX2FC_IO_DBG(io_req, "Entered bnx2fc_tgt_reset_cmpl\n");
1458         /*
1459          * Walk thru the active_ios queue and ABORT the IO
1460          * that matches with the LUN that was reset
1461          */
1462         list_for_each_safe(list, tmp, &tgt->active_cmd_queue) {
1463                 BNX2FC_TGT_DBG(tgt, "TGT RST cmpl: scan for pending IOs\n");
1464                 cmd = (struct bnx2fc_cmd *)list;
1465                 /* Initiate ABTS */
1466                 if (!test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS,
1467                                                         &cmd->req_flags)) {
1468                         /* cancel the IO timeout */
1469                         if (cancel_delayed_work(&io_req->timeout_work))
1470                                 kref_put(&io_req->refcount,
1471                                          bnx2fc_cmd_release); /* timer hold */
1472                         rc = bnx2fc_initiate_abts(cmd);
1473                         /* abts shouldn't fail in this context */
1474                         WARN_ON(rc != SUCCESS);
1475
1476                 } else
1477                         printk(KERN_ERR PFX "tgt_rst: abts already in progress"
1478                                 " for this IO 0x%x\n", cmd->xid);
1479         }
1480 }
1481
1482 void bnx2fc_process_tm_compl(struct bnx2fc_cmd *io_req,
1483                              struct fcoe_task_ctx_entry *task, u8 num_rq)
1484 {
1485         struct bnx2fc_mp_req *tm_req;
1486         struct fc_frame_header *fc_hdr;
1487         struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1488         u64 *hdr;
1489         u64 *temp_hdr;
1490         void *rsp_buf;
1491
1492         /* Called with tgt_lock held */
1493         BNX2FC_IO_DBG(io_req, "Entered process_tm_compl\n");
1494
1495         if (!(test_bit(BNX2FC_FLAG_TM_TIMEOUT, &io_req->req_flags)))
1496                 set_bit(BNX2FC_FLAG_TM_COMPL, &io_req->req_flags);
1497         else {
1498                 /* TM has already timed out and we got
1499                  * delayed completion. Ignore completion
1500                  * processing.
1501                  */
1502                 return;
1503         }
1504
1505         tm_req = &(io_req->mp_req);
1506         fc_hdr = &(tm_req->resp_fc_hdr);
1507         hdr = (u64 *)fc_hdr;
1508         temp_hdr = (u64 *)
1509                 &task->rxwr_only.union_ctx.comp_info.mp_rsp.fc_hdr;
1510         hdr[0] = cpu_to_be64(temp_hdr[0]);
1511         hdr[1] = cpu_to_be64(temp_hdr[1]);
1512         hdr[2] = cpu_to_be64(temp_hdr[2]);
1513
1514         tm_req->resp_len =
1515                 task->rxwr_only.union_ctx.comp_info.mp_rsp.mp_payload_len;
1516
1517         rsp_buf = tm_req->resp_buf;
1518
1519         if (fc_hdr->fh_r_ctl == FC_RCTL_DD_CMD_STATUS) {
1520                 bnx2fc_parse_fcp_rsp(io_req,
1521                                      (struct fcoe_fcp_rsp_payload *)
1522                                      rsp_buf, num_rq);
1523                 if (io_req->fcp_rsp_code == 0) {
1524                         /* TM successful */
1525                         if (tm_req->tm_flags & FCP_TMF_LUN_RESET)
1526                                 bnx2fc_lun_reset_cmpl(io_req);
1527                         else if (tm_req->tm_flags & FCP_TMF_TGT_RESET)
1528                                 bnx2fc_tgt_reset_cmpl(io_req);
1529                 }
1530         } else {
1531                 printk(KERN_ERR PFX "tmf's fc_hdr r_ctl = 0x%x\n",
1532                         fc_hdr->fh_r_ctl);
1533         }
1534         if (!sc_cmd->SCp.ptr) {
1535                 printk(KERN_ERR PFX "tm_compl: SCp.ptr is NULL\n");
1536                 return;
1537         }
1538         switch (io_req->fcp_status) {
1539         case FC_GOOD:
1540                 if (io_req->cdb_status == 0) {
1541                         /* Good IO completion */
1542                         sc_cmd->result = DID_OK << 16;
1543                 } else {
1544                         /* Transport status is good, SCSI status not good */
1545                         sc_cmd->result = (DID_OK << 16) | io_req->cdb_status;
1546                 }
1547                 if (io_req->fcp_resid)
1548                         scsi_set_resid(sc_cmd, io_req->fcp_resid);
1549                 break;
1550
1551         default:
1552                 BNX2FC_IO_DBG(io_req, "process_tm_compl: fcp_status = %d\n",
1553                            io_req->fcp_status);
1554                 break;
1555         }
1556
1557         sc_cmd = io_req->sc_cmd;
1558         io_req->sc_cmd = NULL;
1559
1560         /* check if the io_req exists in tgt's tmf_q */
1561         if (io_req->on_tmf_queue) {
1562
1563                 list_del_init(&io_req->link);
1564                 io_req->on_tmf_queue = 0;
1565         } else {
1566
1567                 printk(KERN_ERR PFX "Command not on active_cmd_queue!\n");
1568                 return;
1569         }
1570
1571         sc_cmd->SCp.ptr = NULL;
1572         sc_cmd->scsi_done(sc_cmd);
1573
1574         kref_put(&io_req->refcount, bnx2fc_cmd_release);
1575         if (io_req->wait_for_comp) {
1576                 BNX2FC_IO_DBG(io_req, "tm_compl - wake up the waiter\n");
1577                 complete(&io_req->tm_done);
1578         }
1579 }
1580
1581 static int bnx2fc_split_bd(struct bnx2fc_cmd *io_req, u64 addr, int sg_len,
1582                            int bd_index)
1583 {
1584         struct fcoe_bd_ctx *bd = io_req->bd_tbl->bd_tbl;
1585         int frag_size, sg_frags;
1586
1587         sg_frags = 0;
1588         while (sg_len) {
1589                 if (sg_len >= BNX2FC_BD_SPLIT_SZ)
1590                         frag_size = BNX2FC_BD_SPLIT_SZ;
1591                 else
1592                         frag_size = sg_len;
1593                 bd[bd_index + sg_frags].buf_addr_lo = addr & 0xffffffff;
1594                 bd[bd_index + sg_frags].buf_addr_hi  = addr >> 32;
1595                 bd[bd_index + sg_frags].buf_len = (u16)frag_size;
1596                 bd[bd_index + sg_frags].flags = 0;
1597
1598                 addr += (u64) frag_size;
1599                 sg_frags++;
1600                 sg_len -= frag_size;
1601         }
1602         return sg_frags;
1603
1604 }
1605
1606 static int bnx2fc_map_sg(struct bnx2fc_cmd *io_req)
1607 {
1608         struct bnx2fc_interface *interface = io_req->port->priv;
1609         struct bnx2fc_hba *hba = interface->hba;
1610         struct scsi_cmnd *sc = io_req->sc_cmd;
1611         struct fcoe_bd_ctx *bd = io_req->bd_tbl->bd_tbl;
1612         struct scatterlist *sg;
1613         int byte_count = 0;
1614         int sg_count = 0;
1615         int bd_count = 0;
1616         int sg_frags;
1617         unsigned int sg_len;
1618         u64 addr;
1619         int i;
1620
1621         sg_count = dma_map_sg(&hba->pcidev->dev, scsi_sglist(sc),
1622                               scsi_sg_count(sc), sc->sc_data_direction);
1623         scsi_for_each_sg(sc, sg, sg_count, i) {
1624                 sg_len = sg_dma_len(sg);
1625                 addr = sg_dma_address(sg);
1626                 if (sg_len > BNX2FC_MAX_BD_LEN) {
1627                         sg_frags = bnx2fc_split_bd(io_req, addr, sg_len,
1628                                                    bd_count);
1629                 } else {
1630
1631                         sg_frags = 1;
1632                         bd[bd_count].buf_addr_lo = addr & 0xffffffff;
1633                         bd[bd_count].buf_addr_hi  = addr >> 32;
1634                         bd[bd_count].buf_len = (u16)sg_len;
1635                         bd[bd_count].flags = 0;
1636                 }
1637                 bd_count += sg_frags;
1638                 byte_count += sg_len;
1639         }
1640         if (byte_count != scsi_bufflen(sc))
1641                 printk(KERN_ERR PFX "byte_count = %d != scsi_bufflen = %d, "
1642                         "task_id = 0x%x\n", byte_count, scsi_bufflen(sc),
1643                         io_req->xid);
1644         return bd_count;
1645 }
1646
1647 static int bnx2fc_build_bd_list_from_sg(struct bnx2fc_cmd *io_req)
1648 {
1649         struct scsi_cmnd *sc = io_req->sc_cmd;
1650         struct fcoe_bd_ctx *bd = io_req->bd_tbl->bd_tbl;
1651         int bd_count;
1652
1653         if (scsi_sg_count(sc)) {
1654                 bd_count = bnx2fc_map_sg(io_req);
1655                 if (bd_count == 0)
1656                         return -ENOMEM;
1657         } else {
1658                 bd_count = 0;
1659                 bd[0].buf_addr_lo = bd[0].buf_addr_hi = 0;
1660                 bd[0].buf_len = bd[0].flags = 0;
1661         }
1662         io_req->bd_tbl->bd_valid = bd_count;
1663
1664         return 0;
1665 }
1666
1667 static void bnx2fc_unmap_sg_list(struct bnx2fc_cmd *io_req)
1668 {
1669         struct scsi_cmnd *sc = io_req->sc_cmd;
1670
1671         if (io_req->bd_tbl->bd_valid && sc) {
1672                 scsi_dma_unmap(sc);
1673                 io_req->bd_tbl->bd_valid = 0;
1674         }
1675 }
1676
1677 void bnx2fc_build_fcp_cmnd(struct bnx2fc_cmd *io_req,
1678                                   struct fcp_cmnd *fcp_cmnd)
1679 {
1680         struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1681         char tag[2];
1682
1683         memset(fcp_cmnd, 0, sizeof(struct fcp_cmnd));
1684
1685         int_to_scsilun(sc_cmd->device->lun,
1686                         (struct scsi_lun *) fcp_cmnd->fc_lun);
1687
1688
1689         fcp_cmnd->fc_dl = htonl(io_req->data_xfer_len);
1690         memcpy(fcp_cmnd->fc_cdb, sc_cmd->cmnd, sc_cmd->cmd_len);
1691
1692         fcp_cmnd->fc_cmdref = 0;
1693         fcp_cmnd->fc_pri_ta = 0;
1694         fcp_cmnd->fc_tm_flags = io_req->mp_req.tm_flags;
1695         fcp_cmnd->fc_flags = io_req->io_req_flags;
1696
1697         if (scsi_populate_tag_msg(sc_cmd, tag)) {
1698                 switch (tag[0]) {
1699                 case HEAD_OF_QUEUE_TAG:
1700                         fcp_cmnd->fc_pri_ta = FCP_PTA_HEADQ;
1701                         break;
1702                 case ORDERED_QUEUE_TAG:
1703                         fcp_cmnd->fc_pri_ta = FCP_PTA_ORDERED;
1704                         break;
1705                 default:
1706                         fcp_cmnd->fc_pri_ta = FCP_PTA_SIMPLE;
1707                         break;
1708                 }
1709         } else {
1710                 fcp_cmnd->fc_pri_ta = 0;
1711         }
1712 }
1713
1714 static void bnx2fc_parse_fcp_rsp(struct bnx2fc_cmd *io_req,
1715                                  struct fcoe_fcp_rsp_payload *fcp_rsp,
1716                                  u8 num_rq)
1717 {
1718         struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1719         struct bnx2fc_rport *tgt = io_req->tgt;
1720         u8 rsp_flags = fcp_rsp->fcp_flags.flags;
1721         u32 rq_buff_len = 0;
1722         int i;
1723         unsigned char *rq_data;
1724         unsigned char *dummy;
1725         int fcp_sns_len = 0;
1726         int fcp_rsp_len = 0;
1727
1728         io_req->fcp_status = FC_GOOD;
1729         io_req->fcp_resid = fcp_rsp->fcp_resid;
1730
1731         io_req->scsi_comp_flags = rsp_flags;
1732         CMD_SCSI_STATUS(sc_cmd) = io_req->cdb_status =
1733                                 fcp_rsp->scsi_status_code;
1734
1735         /* Fetch fcp_rsp_info and fcp_sns_info if available */
1736         if (num_rq) {
1737
1738                 /*
1739                  * We do not anticipate num_rq >1, as the linux defined
1740                  * SCSI_SENSE_BUFFERSIZE is 96 bytes + 8 bytes of FCP_RSP_INFO
1741                  * 256 bytes of single rq buffer is good enough to hold this.
1742                  */
1743
1744                 if (rsp_flags &
1745                     FCOE_FCP_RSP_FLAGS_FCP_RSP_LEN_VALID) {
1746                         fcp_rsp_len = rq_buff_len
1747                                         = fcp_rsp->fcp_rsp_len;
1748                 }
1749
1750                 if (rsp_flags &
1751                     FCOE_FCP_RSP_FLAGS_FCP_SNS_LEN_VALID) {
1752                         fcp_sns_len = fcp_rsp->fcp_sns_len;
1753                         rq_buff_len += fcp_rsp->fcp_sns_len;
1754                 }
1755
1756                 io_req->fcp_rsp_len = fcp_rsp_len;
1757                 io_req->fcp_sns_len = fcp_sns_len;
1758
1759                 if (rq_buff_len > num_rq * BNX2FC_RQ_BUF_SZ) {
1760                         /* Invalid sense sense length. */
1761                         printk(KERN_ERR PFX "invalid sns length %d\n",
1762                                 rq_buff_len);
1763                         /* reset rq_buff_len */
1764                         rq_buff_len =  num_rq * BNX2FC_RQ_BUF_SZ;
1765                 }
1766
1767                 rq_data = bnx2fc_get_next_rqe(tgt, 1);
1768
1769                 if (num_rq > 1) {
1770                         /* We do not need extra sense data */
1771                         for (i = 1; i < num_rq; i++)
1772                                 dummy = bnx2fc_get_next_rqe(tgt, 1);
1773                 }
1774
1775                 /* fetch fcp_rsp_code */
1776                 if ((fcp_rsp_len == 4) || (fcp_rsp_len == 8)) {
1777                         /* Only for task management function */
1778                         io_req->fcp_rsp_code = rq_data[3];
1779                         printk(KERN_ERR PFX "fcp_rsp_code = %d\n",
1780                                 io_req->fcp_rsp_code);
1781                 }
1782
1783                 /* fetch sense data */
1784                 rq_data += fcp_rsp_len;
1785
1786                 if (fcp_sns_len > SCSI_SENSE_BUFFERSIZE) {
1787                         printk(KERN_ERR PFX "Truncating sense buffer\n");
1788                         fcp_sns_len = SCSI_SENSE_BUFFERSIZE;
1789                 }
1790
1791                 memset(sc_cmd->sense_buffer, 0, sizeof(sc_cmd->sense_buffer));
1792                 if (fcp_sns_len)
1793                         memcpy(sc_cmd->sense_buffer, rq_data, fcp_sns_len);
1794
1795                 /* return RQ entries */
1796                 for (i = 0; i < num_rq; i++)
1797                         bnx2fc_return_rqe(tgt, 1);
1798         }
1799 }
1800
1801 /**
1802  * bnx2fc_queuecommand - Queuecommand function of the scsi template
1803  *
1804  * @host:       The Scsi_Host the command was issued to
1805  * @sc_cmd:     struct scsi_cmnd to be executed
1806  *
1807  * This is the IO strategy routine, called by SCSI-ML
1808  **/
1809 int bnx2fc_queuecommand(struct Scsi_Host *host,
1810                         struct scsi_cmnd *sc_cmd)
1811 {
1812         struct fc_lport *lport = shost_priv(host);
1813         struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
1814         struct fc_rport_libfc_priv *rp = rport->dd_data;
1815         struct bnx2fc_rport *tgt;
1816         struct bnx2fc_cmd *io_req;
1817         int rc = 0;
1818         int rval;
1819
1820         rval = fc_remote_port_chkready(rport);
1821         if (rval) {
1822                 sc_cmd->result = rval;
1823                 sc_cmd->scsi_done(sc_cmd);
1824                 return 0;
1825         }
1826
1827         if ((lport->state != LPORT_ST_READY) || !(lport->link_up)) {
1828                 rc = SCSI_MLQUEUE_HOST_BUSY;
1829                 goto exit_qcmd;
1830         }
1831
1832         /* rport and tgt are allocated together, so tgt should be non-NULL */
1833         tgt = (struct bnx2fc_rport *)&rp[1];
1834
1835         if (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags)) {
1836                 /*
1837                  * Session is not offloaded yet. Let SCSI-ml retry
1838                  * the command.
1839                  */
1840                 rc = SCSI_MLQUEUE_TARGET_BUSY;
1841                 goto exit_qcmd;
1842         }
1843
1844         io_req = bnx2fc_cmd_alloc(tgt);
1845         if (!io_req) {
1846                 rc = SCSI_MLQUEUE_HOST_BUSY;
1847                 goto exit_qcmd;
1848         }
1849         io_req->sc_cmd = sc_cmd;
1850
1851         if (bnx2fc_post_io_req(tgt, io_req)) {
1852                 printk(KERN_ERR PFX "Unable to post io_req\n");
1853                 rc = SCSI_MLQUEUE_HOST_BUSY;
1854                 goto exit_qcmd;
1855         }
1856 exit_qcmd:
1857         return rc;
1858 }
1859
1860 void bnx2fc_process_scsi_cmd_compl(struct bnx2fc_cmd *io_req,
1861                                    struct fcoe_task_ctx_entry *task,
1862                                    u8 num_rq)
1863 {
1864         struct fcoe_fcp_rsp_payload *fcp_rsp;
1865         struct bnx2fc_rport *tgt = io_req->tgt;
1866         struct scsi_cmnd *sc_cmd;
1867         struct Scsi_Host *host;
1868
1869
1870         /* scsi_cmd_cmpl is called with tgt lock held */
1871
1872         if (test_and_set_bit(BNX2FC_FLAG_IO_COMPL, &io_req->req_flags)) {
1873                 /* we will not receive ABTS response for this IO */
1874                 BNX2FC_IO_DBG(io_req, "Timer context finished processing "
1875                            "this scsi cmd\n");
1876         }
1877
1878         /* Cancel the timeout_work, as we received IO completion */
1879         if (cancel_delayed_work(&io_req->timeout_work))
1880                 kref_put(&io_req->refcount,
1881                          bnx2fc_cmd_release); /* drop timer hold */
1882
1883         sc_cmd = io_req->sc_cmd;
1884         if (sc_cmd == NULL) {
1885                 printk(KERN_ERR PFX "scsi_cmd_compl - sc_cmd is NULL\n");
1886                 return;
1887         }
1888
1889         /* Fetch fcp_rsp from task context and perform cmd completion */
1890         fcp_rsp = (struct fcoe_fcp_rsp_payload *)
1891                    &(task->rxwr_only.union_ctx.comp_info.fcp_rsp.payload);
1892
1893         /* parse fcp_rsp and obtain sense data from RQ if available */
1894         bnx2fc_parse_fcp_rsp(io_req, fcp_rsp, num_rq);
1895
1896         host = sc_cmd->device->host;
1897         if (!sc_cmd->SCp.ptr) {
1898                 printk(KERN_ERR PFX "SCp.ptr is NULL\n");
1899                 return;
1900         }
1901
1902         if (io_req->on_active_queue) {
1903                 list_del_init(&io_req->link);
1904                 io_req->on_active_queue = 0;
1905                 /* Move IO req to retire queue */
1906                 list_add_tail(&io_req->link, &tgt->io_retire_queue);
1907         } else {
1908                 /* This should not happen, but could have been pulled
1909                  * by bnx2fc_flush_active_ios(), or during a race
1910                  * between command abort and (late) completion.
1911                  */
1912                 BNX2FC_IO_DBG(io_req, "xid not on active_cmd_queue\n");
1913                 if (io_req->wait_for_comp)
1914                         if (test_and_clear_bit(BNX2FC_FLAG_EH_ABORT,
1915                                                &io_req->req_flags))
1916                                 complete(&io_req->tm_done);
1917         }
1918
1919         bnx2fc_unmap_sg_list(io_req);
1920         io_req->sc_cmd = NULL;
1921
1922         switch (io_req->fcp_status) {
1923         case FC_GOOD:
1924                 if (io_req->cdb_status == 0) {
1925                         /* Good IO completion */
1926                         sc_cmd->result = DID_OK << 16;
1927                 } else {
1928                         /* Transport status is good, SCSI status not good */
1929                         BNX2FC_IO_DBG(io_req, "scsi_cmpl: cdb_status = %d"
1930                                  " fcp_resid = 0x%x\n",
1931                                 io_req->cdb_status, io_req->fcp_resid);
1932                         sc_cmd->result = (DID_OK << 16) | io_req->cdb_status;
1933                 }
1934                 if (io_req->fcp_resid)
1935                         scsi_set_resid(sc_cmd, io_req->fcp_resid);
1936                 break;
1937         default:
1938                 printk(KERN_ERR PFX "scsi_cmd_compl: fcp_status = %d\n",
1939                         io_req->fcp_status);
1940                 break;
1941         }
1942         sc_cmd->SCp.ptr = NULL;
1943         sc_cmd->scsi_done(sc_cmd);
1944         kref_put(&io_req->refcount, bnx2fc_cmd_release);
1945 }
1946
1947 int bnx2fc_post_io_req(struct bnx2fc_rport *tgt,
1948                                struct bnx2fc_cmd *io_req)
1949 {
1950         struct fcoe_task_ctx_entry *task;
1951         struct fcoe_task_ctx_entry *task_page;
1952         struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1953         struct fcoe_port *port = tgt->port;
1954         struct bnx2fc_interface *interface = port->priv;
1955         struct bnx2fc_hba *hba = interface->hba;
1956         struct fc_lport *lport = port->lport;
1957         struct fcoe_dev_stats *stats;
1958         int task_idx, index;
1959         u16 xid;
1960
1961         /* Initialize rest of io_req fields */
1962         io_req->cmd_type = BNX2FC_SCSI_CMD;
1963         io_req->port = port;
1964         io_req->tgt = tgt;
1965         io_req->data_xfer_len = scsi_bufflen(sc_cmd);
1966         sc_cmd->SCp.ptr = (char *)io_req;
1967
1968         stats = per_cpu_ptr(lport->dev_stats, get_cpu());
1969         if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE) {
1970                 io_req->io_req_flags = BNX2FC_READ;
1971                 stats->InputRequests++;
1972                 stats->InputBytes += io_req->data_xfer_len;
1973         } else if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) {
1974                 io_req->io_req_flags = BNX2FC_WRITE;
1975                 stats->OutputRequests++;
1976                 stats->OutputBytes += io_req->data_xfer_len;
1977         } else {
1978                 io_req->io_req_flags = 0;
1979                 stats->ControlRequests++;
1980         }
1981         put_cpu();
1982
1983         xid = io_req->xid;
1984
1985         /* Build buffer descriptor list for firmware from sg list */
1986         if (bnx2fc_build_bd_list_from_sg(io_req)) {
1987                 printk(KERN_ERR PFX "BD list creation failed\n");
1988                 spin_lock_bh(&tgt->tgt_lock);
1989                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1990                 spin_unlock_bh(&tgt->tgt_lock);
1991                 return -EAGAIN;
1992         }
1993
1994         task_idx = xid / BNX2FC_TASKS_PER_PAGE;
1995         index = xid % BNX2FC_TASKS_PER_PAGE;
1996
1997         /* Initialize task context for this IO request */
1998         task_page = (struct fcoe_task_ctx_entry *) hba->task_ctx[task_idx];
1999         task = &(task_page[index]);
2000         bnx2fc_init_task(io_req, task);
2001
2002         spin_lock_bh(&tgt->tgt_lock);
2003
2004         if (tgt->flush_in_prog) {
2005                 printk(KERN_ERR PFX "Flush in progress..Host Busy\n");
2006                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
2007                 spin_unlock_bh(&tgt->tgt_lock);
2008                 return -EAGAIN;
2009         }
2010
2011         if (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags)) {
2012                 printk(KERN_ERR PFX "Session not ready...post_io\n");
2013                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
2014                 spin_unlock_bh(&tgt->tgt_lock);
2015                 return -EAGAIN;
2016         }
2017
2018         /* Time IO req */
2019         if (tgt->io_timeout)
2020                 bnx2fc_cmd_timer_set(io_req, BNX2FC_IO_TIMEOUT);
2021         /* Obtain free SQ entry */
2022         bnx2fc_add_2_sq(tgt, xid);
2023
2024         /* Enqueue the io_req to active_cmd_queue */
2025
2026         io_req->on_active_queue = 1;
2027         /* move io_req from pending_queue to active_queue */
2028         list_add_tail(&io_req->link, &tgt->active_cmd_queue);
2029
2030         /* Ring doorbell */
2031         bnx2fc_ring_doorbell(tgt);
2032         spin_unlock_bh(&tgt->tgt_lock);
2033         return 0;
2034 }