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                 if (io_req->on_tmf_queue) {
 816                         list_del_init(&io_req->link);
 817                         io_req->on_tmf_queue = 0;
 818                 }
 819                 io_req->wait_for_comp = 1;
 820                 bnx2fc_initiate_cleanup(io_req);
 821                 spin_unlock_bh(&tgt->tgt_lock);
 822                 rc = wait_for_completion_timeout(&io_req->tm_done,
 823                                                  BNX2FC_FW_TIMEOUT);
 824                 spin_lock_bh(&tgt->tgt_lock);
 825                 io_req->wait_for_comp = 0;
 826                 if (!rc)
 827                         kref_put(&io_req->refcount, bnx2fc_cmd_release);
 828         }
 829
 830         spin_unlock_bh(&tgt->tgt_lock);
 831
 832         if (!rc) {
 833                 BNX2FC_TGT_DBG(tgt, "task mgmt command failed...\n");
 834                 rc = FAILED;
 835         } else {
 836                 BNX2FC_TGT_DBG(tgt, "task mgmt command success...\n");
 837                 rc = SUCCESS;
 838         }
 839 tmf_err:
 840         return rc;
 841 }
 842
 843 int bnx2fc_initiate_abts(struct bnx2fc_cmd *io_req)
 844 {
 845         struct fc_lport *lport;
 846         struct bnx2fc_rport *tgt = io_req->tgt;
 847         struct fc_rport *rport = tgt->rport;
 848         struct fc_rport_priv *rdata = tgt->rdata;
 849         struct bnx2fc_interface *interface;
 850         struct fcoe_port *port;
 851         struct bnx2fc_cmd *abts_io_req;
 852         struct fcoe_task_ctx_entry *task;
 853         struct fcoe_task_ctx_entry *task_page;
 854         struct fc_frame_header *fc_hdr;
 855         struct bnx2fc_mp_req *abts_req;
 856         int task_idx, index;
 857         u32 sid, did;
 858         u16 xid;
 859         int rc = SUCCESS;
 860         u32 r_a_tov = rdata->r_a_tov;
 861
 862         /* called with tgt_lock held */
 863         BNX2FC_IO_DBG(io_req, "Entered bnx2fc_initiate_abts\n");
 864
 865         port = io_req->port;
 866         interface = port->priv;
 867         lport = port->lport;
 868
 869         if (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags)) {
 870                 printk(KERN_ERR PFX "initiate_abts: tgt not offloaded\n");
 871                 rc = FAILED;
 872                 goto abts_err;
 873         }
 874
 875         if (rport == NULL) {
 876                 printk(KERN_ERR PFX "initiate_abts: rport is NULL\n");
 877                 rc = FAILED;
 878                 goto abts_err;
 879         }
 880
 881         if (lport->state != LPORT_ST_READY || !(lport->link_up)) {
 882                 printk(KERN_ERR PFX "initiate_abts: link is not ready\n");
 883                 rc = FAILED;
 884                 goto abts_err;
 885         }
 886
 887         abts_io_req = bnx2fc_elstm_alloc(tgt, BNX2FC_ABTS);
 888         if (!abts_io_req) {
 889                 printk(KERN_ERR PFX "abts: couldnt allocate cmd\n");
 890                 rc = FAILED;
 891                 goto abts_err;
 892         }
 893
 894         /* Initialize rest of io_req fields */
 895         abts_io_req->sc_cmd = NULL;
 896         abts_io_req->port = port;
 897         abts_io_req->tgt = tgt;
 898         abts_io_req->data_xfer_len = 0; /* No data transfer for ABTS */
 899
 900         abts_req = (struct bnx2fc_mp_req *)&(abts_io_req->mp_req);
 901         memset(abts_req, 0, sizeof(struct bnx2fc_mp_req));
 902
 903         /* Fill FC header */
 904         fc_hdr = &(abts_req->req_fc_hdr);
 905
 906         /* Obtain oxid and rxid for the original exchange to be aborted */
 907         fc_hdr->fh_ox_id = htons(io_req->xid);
 908         fc_hdr->fh_rx_id = htons(io_req->task->rxwr_txrd.var_ctx.rx_id);
 909
 910         sid = tgt->sid;
 911         did = rport->port_id;
 912
 913         __fc_fill_fc_hdr(fc_hdr, FC_RCTL_BA_ABTS, did, sid,
 914                            FC_TYPE_BLS, FC_FC_FIRST_SEQ | FC_FC_END_SEQ |
 915                            FC_FC_SEQ_INIT, 0);
 916
 917         xid = abts_io_req->xid;
 918         BNX2FC_IO_DBG(abts_io_req, "ABTS io_req\n");
 919         task_idx = xid/BNX2FC_TASKS_PER_PAGE;
 920         index = xid % BNX2FC_TASKS_PER_PAGE;
 921
 922         /* Initialize task context for this IO request */
 923         task_page = (struct fcoe_task_ctx_entry *)
 924                         interface->hba->task_ctx[task_idx];
 925         task = &(task_page[index]);
 926         bnx2fc_init_mp_task(abts_io_req, task);
 927
 928         /*
 929          * ABTS task is a temporary task that will be cleaned up
 930          * irrespective of ABTS response. We need to start the timer
 931          * for the original exchange, as the CQE is posted for the original
 932          * IO request.
 933          *
 934          * Timer for ABTS is started only when it is originated by a
 935          * TM request. For the ABTS issued as part of ULP timeout,
 936          * scsi-ml maintains the timers.
 937          */
 938
 939         /* if (test_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags))*/
 940         bnx2fc_cmd_timer_set(io_req, 2 * r_a_tov);
 941
 942         /* Obtain free SQ entry */
 943         bnx2fc_add_2_sq(tgt, xid);
 944
 945         /* Ring doorbell */
 946         bnx2fc_ring_doorbell(tgt);
 947
 948 abts_err:
 949         return rc;
 950 }
 951
 952 int bnx2fc_initiate_seq_cleanup(struct bnx2fc_cmd *orig_io_req, u32 offset,
 953                                 enum fc_rctl r_ctl)
 954 {
 955         struct fc_lport *lport;
 956         struct bnx2fc_rport *tgt = orig_io_req->tgt;
 957         struct bnx2fc_interface *interface;
 958         struct fcoe_port *port;
 959         struct bnx2fc_cmd *seq_clnp_req;
 960         struct fcoe_task_ctx_entry *task;
 961         struct fcoe_task_ctx_entry *task_page;
 962         struct bnx2fc_els_cb_arg *cb_arg = NULL;
 963         int task_idx, index;
 964         u16 xid;
 965         int rc = 0;
 966
 967         BNX2FC_IO_DBG(orig_io_req, "bnx2fc_initiate_seq_cleanup xid = 0x%x\n",
 968                    orig_io_req->xid);
 969         kref_get(&orig_io_req->refcount);
 970
 971         port = orig_io_req->port;
 972         interface = port->priv;
 973         lport = port->lport;
 974
 975         cb_arg = kzalloc(sizeof(struct bnx2fc_els_cb_arg), GFP_ATOMIC);
 976         if (!cb_arg) {
 977                 printk(KERN_ERR PFX "Unable to alloc cb_arg for seq clnup\n");
 978                 rc = -ENOMEM;
 979                 goto cleanup_err;
 980         }
 981
 982         seq_clnp_req = bnx2fc_elstm_alloc(tgt, BNX2FC_SEQ_CLEANUP);
 983         if (!seq_clnp_req) {
 984                 printk(KERN_ERR PFX "cleanup: couldnt allocate cmd\n");
 985                 rc = -ENOMEM;
 986                 kfree(cb_arg);
 987                 goto cleanup_err;
 988         }
 989         /* Initialize rest of io_req fields */
 990         seq_clnp_req->sc_cmd = NULL;
 991         seq_clnp_req->port = port;
 992         seq_clnp_req->tgt = tgt;
 993         seq_clnp_req->data_xfer_len = 0; /* No data transfer for cleanup */
 994
 995         xid = seq_clnp_req->xid;
 996
 997         task_idx = xid/BNX2FC_TASKS_PER_PAGE;
 998         index = xid % BNX2FC_TASKS_PER_PAGE;
 999
1000         /* Initialize task context for this IO request */
1001         task_page = (struct fcoe_task_ctx_entry *)
1002                      interface->hba->task_ctx[task_idx];
1003         task = &(task_page[index]);
1004         cb_arg->aborted_io_req = orig_io_req;
1005         cb_arg->io_req = seq_clnp_req;
1006         cb_arg->r_ctl = r_ctl;
1007         cb_arg->offset = offset;
1008         seq_clnp_req->cb_arg = cb_arg;
1009
1010         printk(KERN_ERR PFX "call init_seq_cleanup_task\n");
1011         bnx2fc_init_seq_cleanup_task(seq_clnp_req, task, orig_io_req, offset);
1012
1013         /* Obtain free SQ entry */
1014         bnx2fc_add_2_sq(tgt, xid);
1015
1016         /* Ring doorbell */
1017         bnx2fc_ring_doorbell(tgt);
1018 cleanup_err:
1019         return rc;
1020 }
1021
1022 int bnx2fc_initiate_cleanup(struct bnx2fc_cmd *io_req)
1023 {
1024         struct fc_lport *lport;
1025         struct bnx2fc_rport *tgt = io_req->tgt;
1026         struct bnx2fc_interface *interface;
1027         struct fcoe_port *port;
1028         struct bnx2fc_cmd *cleanup_io_req;
1029         struct fcoe_task_ctx_entry *task;
1030         struct fcoe_task_ctx_entry *task_page;
1031         int task_idx, index;
1032         u16 xid, orig_xid;
1033         int rc = 0;
1034
1035         /* ASSUMPTION: called with tgt_lock held */
1036         BNX2FC_IO_DBG(io_req, "Entered bnx2fc_initiate_cleanup\n");
1037
1038         port = io_req->port;
1039         interface = port->priv;
1040         lport = port->lport;
1041
1042         cleanup_io_req = bnx2fc_elstm_alloc(tgt, BNX2FC_CLEANUP);
1043         if (!cleanup_io_req) {
1044                 printk(KERN_ERR PFX "cleanup: couldnt allocate cmd\n");
1045                 rc = -1;
1046                 goto cleanup_err;
1047         }
1048
1049         /* Initialize rest of io_req fields */
1050         cleanup_io_req->sc_cmd = NULL;
1051         cleanup_io_req->port = port;
1052         cleanup_io_req->tgt = tgt;
1053         cleanup_io_req->data_xfer_len = 0; /* No data transfer for cleanup */
1054
1055         xid = cleanup_io_req->xid;
1056
1057         task_idx = xid/BNX2FC_TASKS_PER_PAGE;
1058         index = xid % BNX2FC_TASKS_PER_PAGE;
1059
1060         /* Initialize task context for this IO request */
1061         task_page = (struct fcoe_task_ctx_entry *)
1062                         interface->hba->task_ctx[task_idx];
1063         task = &(task_page[index]);
1064         orig_xid = io_req->xid;
1065
1066         BNX2FC_IO_DBG(io_req, "CLEANUP io_req xid = 0x%x\n", xid);
1067
1068         bnx2fc_init_cleanup_task(cleanup_io_req, task, orig_xid);
1069
1070         /* Obtain free SQ entry */
1071         bnx2fc_add_2_sq(tgt, xid);
1072
1073         /* Ring doorbell */
1074         bnx2fc_ring_doorbell(tgt);
1075
1076 cleanup_err:
1077         return rc;
1078 }
1079
1080 /**
1081  * bnx2fc_eh_target_reset: Reset a target
1082  *
1083  * @sc_cmd:     SCSI command
1084  *
1085  * Set from SCSI host template to send task mgmt command to the target
1086  *      and wait for the response
1087  */
1088 int bnx2fc_eh_target_reset(struct scsi_cmnd *sc_cmd)
1089 {
1090         return bnx2fc_initiate_tmf(sc_cmd, FCP_TMF_TGT_RESET);
1091 }
1092
1093 /**
1094  * bnx2fc_eh_device_reset - Reset a single LUN
1095  *
1096  * @sc_cmd:     SCSI command
1097  *
1098  * Set from SCSI host template to send task mgmt command to the target
1099  *      and wait for the response
1100  */
1101 int bnx2fc_eh_device_reset(struct scsi_cmnd *sc_cmd)
1102 {
1103         return bnx2fc_initiate_tmf(sc_cmd, FCP_TMF_LUN_RESET);
1104 }
1105
1106 int bnx2fc_expl_logo(struct fc_lport *lport, struct bnx2fc_cmd *io_req)
1107 {
1108         struct bnx2fc_rport *tgt = io_req->tgt;
1109         struct fc_rport_priv *rdata = tgt->rdata;
1110         int logo_issued;
1111         int rc = SUCCESS;
1112         int wait_cnt = 0;
1113
1114         BNX2FC_IO_DBG(io_req, "Expl logo - tgt flags = 0x%lx\n",
1115                       tgt->flags);
1116         logo_issued = test_and_set_bit(BNX2FC_FLAG_EXPL_LOGO,
1117                                        &tgt->flags);
1118         io_req->wait_for_comp = 1;
1119         bnx2fc_initiate_cleanup(io_req);
1120
1121         spin_unlock_bh(&tgt->tgt_lock);
1122
1123         wait_for_completion(&io_req->tm_done);
1124
1125         io_req->wait_for_comp = 0;
1126         /*
1127          * release the reference taken in eh_abort to allow the
1128          * target to re-login after flushing IOs
1129          */
1130          kref_put(&io_req->refcount, bnx2fc_cmd_release);
1131
1132         if (!logo_issued) {
1133                 clear_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags);
1134                 mutex_lock(&lport->disc.disc_mutex);
1135                 lport->tt.rport_logoff(rdata);
1136                 mutex_unlock(&lport->disc.disc_mutex);
1137                 do {
1138                         msleep(BNX2FC_RELOGIN_WAIT_TIME);
1139                         if (wait_cnt++ > BNX2FC_RELOGIN_WAIT_CNT) {
1140                                 rc = FAILED;
1141                                 break;
1142                         }
1143                 } while (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags));
1144         }
1145         spin_lock_bh(&tgt->tgt_lock);
1146         return rc;
1147 }
1148 /**
1149  * bnx2fc_eh_abort - eh_abort_handler api to abort an outstanding
1150  *                      SCSI command
1151  *
1152  * @sc_cmd:     SCSI_ML command pointer
1153  *
1154  * SCSI abort request handler
1155  */
1156 int bnx2fc_eh_abort(struct scsi_cmnd *sc_cmd)
1157 {
1158         struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
1159         struct fc_rport_libfc_priv *rp = rport->dd_data;
1160         struct bnx2fc_cmd *io_req;
1161         struct fc_lport *lport;
1162         struct bnx2fc_rport *tgt;
1163         int rc = FAILED;
1164
1165
1166         rc = fc_block_scsi_eh(sc_cmd);
1167         if (rc)
1168                 return rc;
1169
1170         lport = shost_priv(sc_cmd->device->host);
1171         if ((lport->state != LPORT_ST_READY) || !(lport->link_up)) {
1172                 printk(KERN_ERR PFX "eh_abort: link not ready\n");
1173                 return rc;
1174         }
1175
1176         tgt = (struct bnx2fc_rport *)&rp[1];
1177
1178         BNX2FC_TGT_DBG(tgt, "Entered bnx2fc_eh_abort\n");
1179
1180         spin_lock_bh(&tgt->tgt_lock);
1181         io_req = (struct bnx2fc_cmd *)sc_cmd->SCp.ptr;
1182         if (!io_req) {
1183                 /* Command might have just completed */
1184                 printk(KERN_ERR PFX "eh_abort: io_req is NULL\n");
1185                 spin_unlock_bh(&tgt->tgt_lock);
1186                 return SUCCESS;
1187         }
1188         BNX2FC_IO_DBG(io_req, "eh_abort - refcnt = %d\n",
1189                       io_req->refcount.refcount.counter);
1190
1191         /* Hold IO request across abort processing */
1192         kref_get(&io_req->refcount);
1193
1194         BUG_ON(tgt != io_req->tgt);
1195
1196         /* Remove the io_req from the active_q. */
1197         /*
1198          * Task Mgmt functions (LUN RESET & TGT RESET) will not
1199          * issue an ABTS on this particular IO req, as the
1200          * io_req is no longer in the active_q.
1201          */
1202         if (tgt->flush_in_prog) {
1203                 printk(KERN_ERR PFX "eh_abort: io_req (xid = 0x%x) "
1204                         "flush in progress\n", io_req->xid);
1205                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1206                 spin_unlock_bh(&tgt->tgt_lock);
1207                 return SUCCESS;
1208         }
1209
1210         if (io_req->on_active_queue == 0) {
1211                 printk(KERN_ERR PFX "eh_abort: io_req (xid = 0x%x) "
1212                                 "not on active_q\n", io_req->xid);
1213                 /*
1214                  * This condition can happen only due to the FW bug,
1215                  * where we do not receive cleanup response from
1216                  * the FW. Handle this case gracefully by erroring
1217                  * back the IO request to SCSI-ml
1218                  */
1219                 bnx2fc_scsi_done(io_req, DID_ABORT);
1220
1221                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1222                 spin_unlock_bh(&tgt->tgt_lock);
1223                 return SUCCESS;
1224         }
1225
1226         /*
1227          * Only eh_abort processing will remove the IO from
1228          * active_cmd_q before processing the request. this is
1229          * done to avoid race conditions between IOs aborted
1230          * as part of task management completion and eh_abort
1231          * processing
1232          */
1233         list_del_init(&io_req->link);
1234         io_req->on_active_queue = 0;
1235         /* Move IO req to retire queue */
1236         list_add_tail(&io_req->link, &tgt->io_retire_queue);
1237
1238         init_completion(&io_req->tm_done);
1239
1240         if (test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags)) {
1241                 printk(KERN_ERR PFX "eh_abort: io_req (xid = 0x%x) "
1242                                 "already in abts processing\n", io_req->xid);
1243                 if (cancel_delayed_work(&io_req->timeout_work))
1244                         kref_put(&io_req->refcount,
1245                                  bnx2fc_cmd_release); /* drop timer hold */
1246                 rc = bnx2fc_expl_logo(lport, io_req);
1247                 goto out;
1248         }
1249
1250         /* Cancel the current timer running on this io_req */
1251         if (cancel_delayed_work(&io_req->timeout_work))
1252                 kref_put(&io_req->refcount,
1253                          bnx2fc_cmd_release); /* drop timer hold */
1254         set_bit(BNX2FC_FLAG_EH_ABORT, &io_req->req_flags);
1255         io_req->wait_for_comp = 1;
1256         rc = bnx2fc_initiate_abts(io_req);
1257         if (rc == FAILED) {
1258                 bnx2fc_initiate_cleanup(io_req);
1259                 spin_unlock_bh(&tgt->tgt_lock);
1260                 wait_for_completion(&io_req->tm_done);
1261                 spin_lock_bh(&tgt->tgt_lock);
1262                 io_req->wait_for_comp = 0;
1263                 goto done;
1264         }
1265         spin_unlock_bh(&tgt->tgt_lock);
1266
1267         wait_for_completion(&io_req->tm_done);
1268
1269         spin_lock_bh(&tgt->tgt_lock);
1270         io_req->wait_for_comp = 0;
1271         if (!(test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
1272                                     &io_req->req_flags))) {
1273                 /* Let the scsi-ml try to recover this command */
1274                 printk(KERN_ERR PFX "abort failed, xid = 0x%x\n",
1275                        io_req->xid);
1276                 rc = bnx2fc_expl_logo(lport, io_req);
1277                 goto out;
1278         } else {
1279                 /*
1280                  * We come here even when there was a race condition
1281                  * between timeout and abts completion, and abts
1282                  * completion happens just in time.
1283                  */
1284                 BNX2FC_IO_DBG(io_req, "abort succeeded\n");
1285                 rc = SUCCESS;
1286                 bnx2fc_scsi_done(io_req, DID_ABORT);
1287                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1288         }
1289 done:
1290         /* release the reference taken in eh_abort */
1291         kref_put(&io_req->refcount, bnx2fc_cmd_release);
1292 out:
1293         spin_unlock_bh(&tgt->tgt_lock);
1294         return rc;
1295 }
1296
1297 void bnx2fc_process_seq_cleanup_compl(struct bnx2fc_cmd *seq_clnp_req,
1298                                       struct fcoe_task_ctx_entry *task,
1299                                       u8 rx_state)
1300 {
1301         struct bnx2fc_els_cb_arg *cb_arg = seq_clnp_req->cb_arg;
1302         struct bnx2fc_cmd *orig_io_req = cb_arg->aborted_io_req;
1303         u32 offset = cb_arg->offset;
1304         enum fc_rctl r_ctl = cb_arg->r_ctl;
1305         int rc = 0;
1306         struct bnx2fc_rport *tgt = orig_io_req->tgt;
1307
1308         BNX2FC_IO_DBG(orig_io_req, "Entered process_cleanup_compl xid = 0x%x"
1309                               "cmd_type = %d\n",
1310                    seq_clnp_req->xid, seq_clnp_req->cmd_type);
1311
1312         if (rx_state == FCOE_TASK_RX_STATE_IGNORED_SEQUENCE_CLEANUP) {
1313                 printk(KERN_ERR PFX "seq cleanup ignored - xid = 0x%x\n",
1314                         seq_clnp_req->xid);
1315                 goto free_cb_arg;
1316         }
1317
1318         spin_unlock_bh(&tgt->tgt_lock);
1319         rc = bnx2fc_send_srr(orig_io_req, offset, r_ctl);
1320         spin_lock_bh(&tgt->tgt_lock);
1321
1322         if (rc)
1323                 printk(KERN_ERR PFX "clnup_compl: Unable to send SRR"
1324                         " IO will abort\n");
1325         seq_clnp_req->cb_arg = NULL;
1326         kref_put(&orig_io_req->refcount, bnx2fc_cmd_release);
1327 free_cb_arg:
1328         kfree(cb_arg);
1329         return;
1330 }
1331
1332 void bnx2fc_process_cleanup_compl(struct bnx2fc_cmd *io_req,
1333                                   struct fcoe_task_ctx_entry *task,
1334                                   u8 num_rq)
1335 {
1336         BNX2FC_IO_DBG(io_req, "Entered process_cleanup_compl "
1337                               "refcnt = %d, cmd_type = %d\n",
1338                    io_req->refcount.refcount.counter, io_req->cmd_type);
1339         bnx2fc_scsi_done(io_req, DID_ERROR);
1340         kref_put(&io_req->refcount, bnx2fc_cmd_release);
1341         if (io_req->wait_for_comp)
1342                 complete(&io_req->tm_done);
1343 }
1344
1345 void bnx2fc_process_abts_compl(struct bnx2fc_cmd *io_req,
1346                                struct fcoe_task_ctx_entry *task,
1347                                u8 num_rq)
1348 {
1349         u32 r_ctl;
1350         u32 r_a_tov = FC_DEF_R_A_TOV;
1351         u8 issue_rrq = 0;
1352         struct bnx2fc_rport *tgt = io_req->tgt;
1353
1354         BNX2FC_IO_DBG(io_req, "Entered process_abts_compl xid = 0x%x"
1355                               "refcnt = %d, cmd_type = %d\n",
1356                    io_req->xid,
1357                    io_req->refcount.refcount.counter, io_req->cmd_type);
1358
1359         if (test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
1360                                        &io_req->req_flags)) {
1361                 BNX2FC_IO_DBG(io_req, "Timer context finished processing"
1362                                 " this io\n");
1363                 return;
1364         }
1365
1366         /* Do not issue RRQ as this IO is already cleanedup */
1367         if (test_and_set_bit(BNX2FC_FLAG_IO_CLEANUP,
1368                                 &io_req->req_flags))
1369                 goto io_compl;
1370
1371         /*
1372          * For ABTS issued due to SCSI eh_abort_handler, timeout
1373          * values are maintained by scsi-ml itself. Cancel timeout
1374          * in case ABTS issued as part of task management function
1375          * or due to FW error.
1376          */
1377         if (test_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags))
1378                 if (cancel_delayed_work(&io_req->timeout_work))
1379                         kref_put(&io_req->refcount,
1380                                  bnx2fc_cmd_release); /* drop timer hold */
1381
1382         r_ctl = (u8)task->rxwr_only.union_ctx.comp_info.abts_rsp.r_ctl;
1383
1384         switch (r_ctl) {
1385         case FC_RCTL_BA_ACC:
1386                 /*
1387                  * Dont release this cmd yet. It will be relesed
1388                  * after we get RRQ response
1389                  */
1390                 BNX2FC_IO_DBG(io_req, "ABTS response - ACC Send RRQ\n");
1391                 issue_rrq = 1;
1392                 break;
1393
1394         case FC_RCTL_BA_RJT:
1395                 BNX2FC_IO_DBG(io_req, "ABTS response - RJT\n");
1396                 break;
1397         default:
1398                 printk(KERN_ERR PFX "Unknown ABTS response\n");
1399                 break;
1400         }
1401
1402         if (issue_rrq) {
1403                 BNX2FC_IO_DBG(io_req, "Issue RRQ after R_A_TOV\n");
1404                 set_bit(BNX2FC_FLAG_ISSUE_RRQ, &io_req->req_flags);
1405         }
1406         set_bit(BNX2FC_FLAG_RETIRE_OXID, &io_req->req_flags);
1407         bnx2fc_cmd_timer_set(io_req, r_a_tov);
1408
1409 io_compl:
1410         if (io_req->wait_for_comp) {
1411                 if (test_and_clear_bit(BNX2FC_FLAG_EH_ABORT,
1412                                        &io_req->req_flags))
1413                         complete(&io_req->tm_done);
1414         } else {
1415                 /*
1416                  * We end up here when ABTS is issued as
1417                  * in asynchronous context, i.e., as part
1418                  * of task management completion, or
1419                  * when FW error is received or when the
1420                  * ABTS is issued when the IO is timed
1421                  * out.
1422                  */
1423
1424                 if (io_req->on_active_queue) {
1425                         list_del_init(&io_req->link);
1426                         io_req->on_active_queue = 0;
1427                         /* Move IO req to retire queue */
1428                         list_add_tail(&io_req->link, &tgt->io_retire_queue);
1429                 }
1430                 bnx2fc_scsi_done(io_req, DID_ERROR);
1431                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1432         }
1433 }
1434
1435 static void bnx2fc_lun_reset_cmpl(struct bnx2fc_cmd *io_req)
1436 {
1437         struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1438         struct bnx2fc_rport *tgt = io_req->tgt;
1439         struct list_head *list;
1440         struct list_head *tmp;
1441         struct bnx2fc_cmd *cmd;
1442         int tm_lun = sc_cmd->device->lun;
1443         int rc = 0;
1444         int lun;
1445
1446         /* called with tgt_lock held */
1447         BNX2FC_IO_DBG(io_req, "Entered bnx2fc_lun_reset_cmpl\n");
1448         /*
1449          * Walk thru the active_ios queue and ABORT the IO
1450          * that matches with the LUN that was reset
1451          */
1452         list_for_each_safe(list, tmp, &tgt->active_cmd_queue) {
1453                 BNX2FC_TGT_DBG(tgt, "LUN RST cmpl: scan for pending IOs\n");
1454                 cmd = (struct bnx2fc_cmd *)list;
1455                 lun = cmd->sc_cmd->device->lun;
1456                 if (lun == tm_lun) {
1457                         /* Initiate ABTS on this cmd */
1458                         if (!test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS,
1459                                               &cmd->req_flags)) {
1460                                 /* cancel the IO timeout */
1461                                 if (cancel_delayed_work(&io_req->timeout_work))
1462                                         kref_put(&io_req->refcount,
1463                                                  bnx2fc_cmd_release);
1464                                                         /* timer hold */
1465                                 rc = bnx2fc_initiate_abts(cmd);
1466                                 /* abts shouldn't fail in this context */
1467                                 WARN_ON(rc != SUCCESS);
1468                         } else
1469                                 printk(KERN_ERR PFX "lun_rst: abts already in"
1470                                         " progress for this IO 0x%x\n",
1471                                         cmd->xid);
1472                 }
1473         }
1474 }
1475
1476 static void bnx2fc_tgt_reset_cmpl(struct bnx2fc_cmd *io_req)
1477 {
1478         struct bnx2fc_rport *tgt = io_req->tgt;
1479         struct list_head *list;
1480         struct list_head *tmp;
1481         struct bnx2fc_cmd *cmd;
1482         int rc = 0;
1483
1484         /* called with tgt_lock held */
1485         BNX2FC_IO_DBG(io_req, "Entered bnx2fc_tgt_reset_cmpl\n");
1486         /*
1487          * Walk thru the active_ios queue and ABORT the IO
1488          * that matches with the LUN that was reset
1489          */
1490         list_for_each_safe(list, tmp, &tgt->active_cmd_queue) {
1491                 BNX2FC_TGT_DBG(tgt, "TGT RST cmpl: scan for pending IOs\n");
1492                 cmd = (struct bnx2fc_cmd *)list;
1493                 /* Initiate ABTS */
1494                 if (!test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS,
1495                                                         &cmd->req_flags)) {
1496                         /* cancel the IO timeout */
1497                         if (cancel_delayed_work(&io_req->timeout_work))
1498                                 kref_put(&io_req->refcount,
1499                                          bnx2fc_cmd_release); /* timer hold */
1500                         rc = bnx2fc_initiate_abts(cmd);
1501                         /* abts shouldn't fail in this context */
1502                         WARN_ON(rc != SUCCESS);
1503
1504                 } else
1505                         printk(KERN_ERR PFX "tgt_rst: abts already in progress"
1506                                 " for this IO 0x%x\n", cmd->xid);
1507         }
1508 }
1509
1510 void bnx2fc_process_tm_compl(struct bnx2fc_cmd *io_req,
1511                              struct fcoe_task_ctx_entry *task, u8 num_rq)
1512 {
1513         struct bnx2fc_mp_req *tm_req;
1514         struct fc_frame_header *fc_hdr;
1515         struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1516         u64 *hdr;
1517         u64 *temp_hdr;
1518         void *rsp_buf;
1519
1520         /* Called with tgt_lock held */
1521         BNX2FC_IO_DBG(io_req, "Entered process_tm_compl\n");
1522
1523         if (!(test_bit(BNX2FC_FLAG_TM_TIMEOUT, &io_req->req_flags)))
1524                 set_bit(BNX2FC_FLAG_TM_COMPL, &io_req->req_flags);
1525         else {
1526                 /* TM has already timed out and we got
1527                  * delayed completion. Ignore completion
1528                  * processing.
1529                  */
1530                 return;
1531         }
1532
1533         tm_req = &(io_req->mp_req);
1534         fc_hdr = &(tm_req->resp_fc_hdr);
1535         hdr = (u64 *)fc_hdr;
1536         temp_hdr = (u64 *)
1537                 &task->rxwr_only.union_ctx.comp_info.mp_rsp.fc_hdr;
1538         hdr[0] = cpu_to_be64(temp_hdr[0]);
1539         hdr[1] = cpu_to_be64(temp_hdr[1]);
1540         hdr[2] = cpu_to_be64(temp_hdr[2]);
1541
1542         tm_req->resp_len =
1543                 task->rxwr_only.union_ctx.comp_info.mp_rsp.mp_payload_len;
1544
1545         rsp_buf = tm_req->resp_buf;
1546
1547         if (fc_hdr->fh_r_ctl == FC_RCTL_DD_CMD_STATUS) {
1548                 bnx2fc_parse_fcp_rsp(io_req,
1549                                      (struct fcoe_fcp_rsp_payload *)
1550                                      rsp_buf, num_rq);
1551                 if (io_req->fcp_rsp_code == 0) {
1552                         /* TM successful */
1553                         if (tm_req->tm_flags & FCP_TMF_LUN_RESET)
1554                                 bnx2fc_lun_reset_cmpl(io_req);
1555                         else if (tm_req->tm_flags & FCP_TMF_TGT_RESET)
1556                                 bnx2fc_tgt_reset_cmpl(io_req);
1557                 }
1558         } else {
1559                 printk(KERN_ERR PFX "tmf's fc_hdr r_ctl = 0x%x\n",
1560                         fc_hdr->fh_r_ctl);
1561         }
1562         if (!sc_cmd->SCp.ptr) {
1563                 printk(KERN_ERR PFX "tm_compl: SCp.ptr is NULL\n");
1564                 return;
1565         }
1566         switch (io_req->fcp_status) {
1567         case FC_GOOD:
1568                 if (io_req->cdb_status == 0) {
1569                         /* Good IO completion */
1570                         sc_cmd->result = DID_OK << 16;
1571                 } else {
1572                         /* Transport status is good, SCSI status not good */
1573                         sc_cmd->result = (DID_OK << 16) | io_req->cdb_status;
1574                 }
1575                 if (io_req->fcp_resid)
1576                         scsi_set_resid(sc_cmd, io_req->fcp_resid);
1577                 break;
1578
1579         default:
1580                 BNX2FC_IO_DBG(io_req, "process_tm_compl: fcp_status = %d\n",
1581                            io_req->fcp_status);
1582                 break;
1583         }
1584
1585         sc_cmd = io_req->sc_cmd;
1586         io_req->sc_cmd = NULL;
1587
1588         /* check if the io_req exists in tgt's tmf_q */
1589         if (io_req->on_tmf_queue) {
1590
1591                 list_del_init(&io_req->link);
1592                 io_req->on_tmf_queue = 0;
1593         } else {
1594
1595                 printk(KERN_ERR PFX "Command not on active_cmd_queue!\n");
1596                 return;
1597         }
1598
1599         sc_cmd->SCp.ptr = NULL;
1600         sc_cmd->scsi_done(sc_cmd);
1601
1602         kref_put(&io_req->refcount, bnx2fc_cmd_release);
1603         if (io_req->wait_for_comp) {
1604                 BNX2FC_IO_DBG(io_req, "tm_compl - wake up the waiter\n");
1605                 complete(&io_req->tm_done);
1606         }
1607 }
1608
1609 static int bnx2fc_split_bd(struct bnx2fc_cmd *io_req, u64 addr, int sg_len,
1610                            int bd_index)
1611 {
1612         struct fcoe_bd_ctx *bd = io_req->bd_tbl->bd_tbl;
1613         int frag_size, sg_frags;
1614
1615         sg_frags = 0;
1616         while (sg_len) {
1617                 if (sg_len >= BNX2FC_BD_SPLIT_SZ)
1618                         frag_size = BNX2FC_BD_SPLIT_SZ;
1619                 else
1620                         frag_size = sg_len;
1621                 bd[bd_index + sg_frags].buf_addr_lo = addr & 0xffffffff;
1622                 bd[bd_index + sg_frags].buf_addr_hi  = addr >> 32;
1623                 bd[bd_index + sg_frags].buf_len = (u16)frag_size;
1624                 bd[bd_index + sg_frags].flags = 0;
1625
1626                 addr += (u64) frag_size;
1627                 sg_frags++;
1628                 sg_len -= frag_size;
1629         }
1630         return sg_frags;
1631
1632 }
1633
1634 static int bnx2fc_map_sg(struct bnx2fc_cmd *io_req)
1635 {
1636         struct bnx2fc_interface *interface = io_req->port->priv;
1637         struct bnx2fc_hba *hba = interface->hba;
1638         struct scsi_cmnd *sc = io_req->sc_cmd;
1639         struct fcoe_bd_ctx *bd = io_req->bd_tbl->bd_tbl;
1640         struct scatterlist *sg;
1641         int byte_count = 0;
1642         int sg_count = 0;
1643         int bd_count = 0;
1644         int sg_frags;
1645         unsigned int sg_len;
1646         u64 addr;
1647         int i;
1648
1649         sg_count = dma_map_sg(&hba->pcidev->dev, scsi_sglist(sc),
1650                               scsi_sg_count(sc), sc->sc_data_direction);
1651         scsi_for_each_sg(sc, sg, sg_count, i) {
1652                 sg_len = sg_dma_len(sg);
1653                 addr = sg_dma_address(sg);
1654                 if (sg_len > BNX2FC_MAX_BD_LEN) {
1655                         sg_frags = bnx2fc_split_bd(io_req, addr, sg_len,
1656                                                    bd_count);
1657                 } else {
1658
1659                         sg_frags = 1;
1660                         bd[bd_count].buf_addr_lo = addr & 0xffffffff;
1661                         bd[bd_count].buf_addr_hi  = addr >> 32;
1662                         bd[bd_count].buf_len = (u16)sg_len;
1663                         bd[bd_count].flags = 0;
1664                 }
1665                 bd_count += sg_frags;
1666                 byte_count += sg_len;
1667         }
1668         if (byte_count != scsi_bufflen(sc))
1669                 printk(KERN_ERR PFX "byte_count = %d != scsi_bufflen = %d, "
1670                         "task_id = 0x%x\n", byte_count, scsi_bufflen(sc),
1671                         io_req->xid);
1672         return bd_count;
1673 }
1674
1675 static int bnx2fc_build_bd_list_from_sg(struct bnx2fc_cmd *io_req)
1676 {
1677         struct scsi_cmnd *sc = io_req->sc_cmd;
1678         struct fcoe_bd_ctx *bd = io_req->bd_tbl->bd_tbl;
1679         int bd_count;
1680
1681         if (scsi_sg_count(sc)) {
1682                 bd_count = bnx2fc_map_sg(io_req);
1683                 if (bd_count == 0)
1684                         return -ENOMEM;
1685         } else {
1686                 bd_count = 0;
1687                 bd[0].buf_addr_lo = bd[0].buf_addr_hi = 0;
1688                 bd[0].buf_len = bd[0].flags = 0;
1689         }
1690         io_req->bd_tbl->bd_valid = bd_count;
1691
1692         return 0;
1693 }
1694
1695 static void bnx2fc_unmap_sg_list(struct bnx2fc_cmd *io_req)
1696 {
1697         struct scsi_cmnd *sc = io_req->sc_cmd;
1698
1699         if (io_req->bd_tbl->bd_valid && sc) {
1700                 scsi_dma_unmap(sc);
1701                 io_req->bd_tbl->bd_valid = 0;
1702         }
1703 }
1704
1705 void bnx2fc_build_fcp_cmnd(struct bnx2fc_cmd *io_req,
1706                                   struct fcp_cmnd *fcp_cmnd)
1707 {
1708         struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1709         char tag[2];
1710
1711         memset(fcp_cmnd, 0, sizeof(struct fcp_cmnd));
1712
1713         int_to_scsilun(sc_cmd->device->lun, &fcp_cmnd->fc_lun);
1714
1715         fcp_cmnd->fc_dl = htonl(io_req->data_xfer_len);
1716         memcpy(fcp_cmnd->fc_cdb, sc_cmd->cmnd, sc_cmd->cmd_len);
1717
1718         fcp_cmnd->fc_cmdref = 0;
1719         fcp_cmnd->fc_pri_ta = 0;
1720         fcp_cmnd->fc_tm_flags = io_req->mp_req.tm_flags;
1721         fcp_cmnd->fc_flags = io_req->io_req_flags;
1722
1723         if (scsi_populate_tag_msg(sc_cmd, tag)) {
1724                 switch (tag[0]) {
1725                 case HEAD_OF_QUEUE_TAG:
1726                         fcp_cmnd->fc_pri_ta = FCP_PTA_HEADQ;
1727                         break;
1728                 case ORDERED_QUEUE_TAG:
1729                         fcp_cmnd->fc_pri_ta = FCP_PTA_ORDERED;
1730                         break;
1731                 default:
1732                         fcp_cmnd->fc_pri_ta = FCP_PTA_SIMPLE;
1733                         break;
1734                 }
1735         } else {
1736                 fcp_cmnd->fc_pri_ta = 0;
1737         }
1738 }
1739
1740 static void bnx2fc_parse_fcp_rsp(struct bnx2fc_cmd *io_req,
1741                                  struct fcoe_fcp_rsp_payload *fcp_rsp,
1742                                  u8 num_rq)
1743 {
1744         struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1745         struct bnx2fc_rport *tgt = io_req->tgt;
1746         u8 rsp_flags = fcp_rsp->fcp_flags.flags;
1747         u32 rq_buff_len = 0;
1748         int i;
1749         unsigned char *rq_data;
1750         unsigned char *dummy;
1751         int fcp_sns_len = 0;
1752         int fcp_rsp_len = 0;
1753
1754         io_req->fcp_status = FC_GOOD;
1755         io_req->fcp_resid = fcp_rsp->fcp_resid;
1756
1757         io_req->scsi_comp_flags = rsp_flags;
1758         CMD_SCSI_STATUS(sc_cmd) = io_req->cdb_status =
1759                                 fcp_rsp->scsi_status_code;
1760
1761         /* Fetch fcp_rsp_info and fcp_sns_info if available */
1762         if (num_rq) {
1763
1764                 /*
1765                  * We do not anticipate num_rq >1, as the linux defined
1766                  * SCSI_SENSE_BUFFERSIZE is 96 bytes + 8 bytes of FCP_RSP_INFO
1767                  * 256 bytes of single rq buffer is good enough to hold this.
1768                  */
1769
1770                 if (rsp_flags &
1771                     FCOE_FCP_RSP_FLAGS_FCP_RSP_LEN_VALID) {
1772                         fcp_rsp_len = rq_buff_len
1773                                         = fcp_rsp->fcp_rsp_len;
1774                 }
1775
1776                 if (rsp_flags &
1777                     FCOE_FCP_RSP_FLAGS_FCP_SNS_LEN_VALID) {
1778                         fcp_sns_len = fcp_rsp->fcp_sns_len;
1779                         rq_buff_len += fcp_rsp->fcp_sns_len;
1780                 }
1781
1782                 io_req->fcp_rsp_len = fcp_rsp_len;
1783                 io_req->fcp_sns_len = fcp_sns_len;
1784
1785                 if (rq_buff_len > num_rq * BNX2FC_RQ_BUF_SZ) {
1786                         /* Invalid sense sense length. */
1787                         printk(KERN_ERR PFX "invalid sns length %d\n",
1788                                 rq_buff_len);
1789                         /* reset rq_buff_len */
1790                         rq_buff_len =  num_rq * BNX2FC_RQ_BUF_SZ;
1791                 }
1792
1793                 rq_data = bnx2fc_get_next_rqe(tgt, 1);
1794
1795                 if (num_rq > 1) {
1796                         /* We do not need extra sense data */
1797                         for (i = 1; i < num_rq; i++)
1798                                 dummy = bnx2fc_get_next_rqe(tgt, 1);
1799                 }
1800
1801                 /* fetch fcp_rsp_code */
1802                 if ((fcp_rsp_len == 4) || (fcp_rsp_len == 8)) {
1803                         /* Only for task management function */
1804                         io_req->fcp_rsp_code = rq_data[3];
1805                         printk(KERN_ERR PFX "fcp_rsp_code = %d\n",
1806                                 io_req->fcp_rsp_code);
1807                 }
1808
1809                 /* fetch sense data */
1810                 rq_data += fcp_rsp_len;
1811
1812                 if (fcp_sns_len > SCSI_SENSE_BUFFERSIZE) {
1813                         printk(KERN_ERR PFX "Truncating sense buffer\n");
1814                         fcp_sns_len = SCSI_SENSE_BUFFERSIZE;
1815                 }
1816
1817                 memset(sc_cmd->sense_buffer, 0, sizeof(sc_cmd->sense_buffer));
1818                 if (fcp_sns_len)
1819                         memcpy(sc_cmd->sense_buffer, rq_data, fcp_sns_len);
1820
1821                 /* return RQ entries */
1822                 for (i = 0; i < num_rq; i++)
1823                         bnx2fc_return_rqe(tgt, 1);
1824         }
1825 }
1826
1827 /**
1828  * bnx2fc_queuecommand - Queuecommand function of the scsi template
1829  *
1830  * @host:       The Scsi_Host the command was issued to
1831  * @sc_cmd:     struct scsi_cmnd to be executed
1832  *
1833  * This is the IO strategy routine, called by SCSI-ML
1834  **/
1835 int bnx2fc_queuecommand(struct Scsi_Host *host,
1836                         struct scsi_cmnd *sc_cmd)
1837 {
1838         struct fc_lport *lport = shost_priv(host);
1839         struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
1840         struct fc_rport_libfc_priv *rp = rport->dd_data;
1841         struct bnx2fc_rport *tgt;
1842         struct bnx2fc_cmd *io_req;
1843         int rc = 0;
1844         int rval;
1845
1846         rval = fc_remote_port_chkready(rport);
1847         if (rval) {
1848                 sc_cmd->result = rval;
1849                 sc_cmd->scsi_done(sc_cmd);
1850                 return 0;
1851         }
1852
1853         if ((lport->state != LPORT_ST_READY) || !(lport->link_up)) {
1854                 rc = SCSI_MLQUEUE_HOST_BUSY;
1855                 goto exit_qcmd;
1856         }
1857
1858         /* rport and tgt are allocated together, so tgt should be non-NULL */
1859         tgt = (struct bnx2fc_rport *)&rp[1];
1860
1861         if (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags)) {
1862                 /*
1863                  * Session is not offloaded yet. Let SCSI-ml retry
1864                  * the command.
1865                  */
1866                 rc = SCSI_MLQUEUE_TARGET_BUSY;
1867                 goto exit_qcmd;
1868         }
1869
1870         io_req = bnx2fc_cmd_alloc(tgt);
1871         if (!io_req) {
1872                 rc = SCSI_MLQUEUE_HOST_BUSY;
1873                 goto exit_qcmd;
1874         }
1875         io_req->sc_cmd = sc_cmd;
1876
1877         if (bnx2fc_post_io_req(tgt, io_req)) {
1878                 printk(KERN_ERR PFX "Unable to post io_req\n");
1879                 rc = SCSI_MLQUEUE_HOST_BUSY;
1880                 goto exit_qcmd;
1881         }
1882 exit_qcmd:
1883         return rc;
1884 }
1885
1886 void bnx2fc_process_scsi_cmd_compl(struct bnx2fc_cmd *io_req,
1887                                    struct fcoe_task_ctx_entry *task,
1888                                    u8 num_rq)
1889 {
1890         struct fcoe_fcp_rsp_payload *fcp_rsp;
1891         struct bnx2fc_rport *tgt = io_req->tgt;
1892         struct scsi_cmnd *sc_cmd;
1893         struct Scsi_Host *host;
1894
1895
1896         /* scsi_cmd_cmpl is called with tgt lock held */
1897
1898         if (test_and_set_bit(BNX2FC_FLAG_IO_COMPL, &io_req->req_flags)) {
1899                 /* we will not receive ABTS response for this IO */
1900                 BNX2FC_IO_DBG(io_req, "Timer context finished processing "
1901                            "this scsi cmd\n");
1902         }
1903
1904         /* Cancel the timeout_work, as we received IO completion */
1905         if (cancel_delayed_work(&io_req->timeout_work))
1906                 kref_put(&io_req->refcount,
1907                          bnx2fc_cmd_release); /* drop timer hold */
1908
1909         sc_cmd = io_req->sc_cmd;
1910         if (sc_cmd == NULL) {
1911                 printk(KERN_ERR PFX "scsi_cmd_compl - sc_cmd is NULL\n");
1912                 return;
1913         }
1914
1915         /* Fetch fcp_rsp from task context and perform cmd completion */
1916         fcp_rsp = (struct fcoe_fcp_rsp_payload *)
1917                    &(task->rxwr_only.union_ctx.comp_info.fcp_rsp.payload);
1918
1919         /* parse fcp_rsp and obtain sense data from RQ if available */
1920         bnx2fc_parse_fcp_rsp(io_req, fcp_rsp, num_rq);
1921
1922         host = sc_cmd->device->host;
1923         if (!sc_cmd->SCp.ptr) {
1924                 printk(KERN_ERR PFX "SCp.ptr is NULL\n");
1925                 return;
1926         }
1927
1928         if (io_req->on_active_queue) {
1929                 list_del_init(&io_req->link);
1930                 io_req->on_active_queue = 0;
1931                 /* Move IO req to retire queue */
1932                 list_add_tail(&io_req->link, &tgt->io_retire_queue);
1933         } else {
1934                 /* This should not happen, but could have been pulled
1935                  * by bnx2fc_flush_active_ios(), or during a race
1936                  * between command abort and (late) completion.
1937                  */
1938                 BNX2FC_IO_DBG(io_req, "xid not on active_cmd_queue\n");
1939                 if (io_req->wait_for_comp)
1940                         if (test_and_clear_bit(BNX2FC_FLAG_EH_ABORT,
1941                                                &io_req->req_flags))
1942                                 complete(&io_req->tm_done);
1943         }
1944
1945         bnx2fc_unmap_sg_list(io_req);
1946         io_req->sc_cmd = NULL;
1947
1948         switch (io_req->fcp_status) {
1949         case FC_GOOD:
1950                 if (io_req->cdb_status == 0) {
1951                         /* Good IO completion */
1952                         sc_cmd->result = DID_OK << 16;
1953                 } else {
1954                         /* Transport status is good, SCSI status not good */
1955                         BNX2FC_IO_DBG(io_req, "scsi_cmpl: cdb_status = %d"
1956                                  " fcp_resid = 0x%x\n",
1957                                 io_req->cdb_status, io_req->fcp_resid);
1958                         sc_cmd->result = (DID_OK << 16) | io_req->cdb_status;
1959                 }
1960                 if (io_req->fcp_resid)
1961                         scsi_set_resid(sc_cmd, io_req->fcp_resid);
1962                 break;
1963         default:
1964                 printk(KERN_ERR PFX "scsi_cmd_compl: fcp_status = %d\n",
1965                         io_req->fcp_status);
1966                 break;
1967         }
1968         sc_cmd->SCp.ptr = NULL;
1969         sc_cmd->scsi_done(sc_cmd);
1970         kref_put(&io_req->refcount, bnx2fc_cmd_release);
1971 }
1972
1973 int bnx2fc_post_io_req(struct bnx2fc_rport *tgt,
1974                                struct bnx2fc_cmd *io_req)
1975 {
1976         struct fcoe_task_ctx_entry *task;
1977         struct fcoe_task_ctx_entry *task_page;
1978         struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1979         struct fcoe_port *port = tgt->port;
1980         struct bnx2fc_interface *interface = port->priv;
1981         struct bnx2fc_hba *hba = interface->hba;
1982         struct fc_lport *lport = port->lport;
1983         struct fc_stats *stats;
1984         int task_idx, index;
1985         u16 xid;
1986
1987         /* Initialize rest of io_req fields */
1988         io_req->cmd_type = BNX2FC_SCSI_CMD;
1989         io_req->port = port;
1990         io_req->tgt = tgt;
1991         io_req->data_xfer_len = scsi_bufflen(sc_cmd);
1992         sc_cmd->SCp.ptr = (char *)io_req;
1993
1994         stats = per_cpu_ptr(lport->stats, get_cpu());
1995         if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE) {
1996                 io_req->io_req_flags = BNX2FC_READ;
1997                 stats->InputRequests++;
1998                 stats->InputBytes += io_req->data_xfer_len;
1999         } else if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) {
2000                 io_req->io_req_flags = BNX2FC_WRITE;
2001                 stats->OutputRequests++;
2002                 stats->OutputBytes += io_req->data_xfer_len;
2003         } else {
2004                 io_req->io_req_flags = 0;
2005                 stats->ControlRequests++;
2006         }
2007         put_cpu();
2008
2009         xid = io_req->xid;
2010
2011         /* Build buffer descriptor list for firmware from sg list */
2012         if (bnx2fc_build_bd_list_from_sg(io_req)) {
2013                 printk(KERN_ERR PFX "BD list creation failed\n");
2014                 spin_lock_bh(&tgt->tgt_lock);
2015                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
2016                 spin_unlock_bh(&tgt->tgt_lock);
2017                 return -EAGAIN;
2018         }
2019
2020         task_idx = xid / BNX2FC_TASKS_PER_PAGE;
2021         index = xid % BNX2FC_TASKS_PER_PAGE;
2022
2023         /* Initialize task context for this IO request */
2024         task_page = (struct fcoe_task_ctx_entry *) hba->task_ctx[task_idx];
2025         task = &(task_page[index]);
2026         bnx2fc_init_task(io_req, task);
2027
2028         spin_lock_bh(&tgt->tgt_lock);
2029
2030         if (tgt->flush_in_prog) {
2031                 printk(KERN_ERR PFX "Flush in progress..Host Busy\n");
2032                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
2033                 spin_unlock_bh(&tgt->tgt_lock);
2034                 return -EAGAIN;
2035         }
2036
2037         if (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags)) {
2038                 printk(KERN_ERR PFX "Session not ready...post_io\n");
2039                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
2040                 spin_unlock_bh(&tgt->tgt_lock);
2041                 return -EAGAIN;
2042         }
2043
2044         /* Time IO req */
2045         if (tgt->io_timeout)
2046                 bnx2fc_cmd_timer_set(io_req, BNX2FC_IO_TIMEOUT);
2047         /* Obtain free SQ entry */
2048         bnx2fc_add_2_sq(tgt, xid);
2049
2050         /* Enqueue the io_req to active_cmd_queue */
2051
2052         io_req->on_active_queue = 1;
2053         /* move io_req from pending_queue to active_queue */
2054         list_add_tail(&io_req->link, &tgt->active_cmd_queue);
2055
2056         /* Ring doorbell */
2057         bnx2fc_ring_doorbell(tgt);
2058         spin_unlock_bh(&tgt->tgt_lock);
2059         return 0;
2060 }