drivers/scsi/bnx2fc/bnx2fc_io.c

   1 /* bnx2fc_io.c: QLogic Linux FCoE offload driver.
   2  * IO manager and SCSI IO processing.
   3  *
   4  * Copyright (c) 2008-2013 Broadcom Corporation
   5  * Copyright (c) 2014-2016 QLogic Corporation
   6  * Copyright (c) 2016-2017 Cavium Inc.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation.
  11  *
  12  * Written by: Bhanu Prakash Gollapudi (bprakash@broadcom.com)
  13  */
  14
  15 #include "bnx2fc.h"
  16
  17 #define RESERVE_FREE_LIST_INDEX num_possible_cpus()
  18
  19 static int bnx2fc_split_bd(struct bnx2fc_cmd *io_req, u64 addr, int sg_len,
  20                            int bd_index);
  21 static int bnx2fc_map_sg(struct bnx2fc_cmd *io_req);
  22 static int bnx2fc_build_bd_list_from_sg(struct bnx2fc_cmd *io_req);
  23 static void bnx2fc_unmap_sg_list(struct bnx2fc_cmd *io_req);
  24 static void bnx2fc_free_mp_resc(struct bnx2fc_cmd *io_req);
  25 static void bnx2fc_parse_fcp_rsp(struct bnx2fc_cmd *io_req,
  26                                  struct fcoe_fcp_rsp_payload *fcp_rsp,
  27                                  u8 num_rq, unsigned char *rq_data);
  28
  29 void bnx2fc_cmd_timer_set(struct bnx2fc_cmd *io_req,
  30                           unsigned int timer_msec)
  31 {
  32         struct bnx2fc_interface *interface = io_req->port->priv;
  33
  34         if (queue_delayed_work(interface->timer_work_queue,
  35                                &io_req->timeout_work,
  36                                msecs_to_jiffies(timer_msec)))
  37                 kref_get(&io_req->refcount);
  38 }
  39
  40 static void bnx2fc_cmd_timeout(struct work_struct *work)
  41 {
  42         struct bnx2fc_cmd *io_req = container_of(work, struct bnx2fc_cmd,
  43                                                  timeout_work.work);
  44         u8 cmd_type = io_req->cmd_type;
  45         struct bnx2fc_rport *tgt = io_req->tgt;
  46         int rc;
  47
  48         BNX2FC_IO_DBG(io_req, "cmd_timeout, cmd_type = %d,"
  49                       "req_flags = %lx\n", cmd_type, io_req->req_flags);
  50
  51         spin_lock_bh(&tgt->tgt_lock);
  52         if (test_and_clear_bit(BNX2FC_FLAG_ISSUE_RRQ, &io_req->req_flags)) {
  53                 clear_bit(BNX2FC_FLAG_RETIRE_OXID, &io_req->req_flags);
  54                 /*
  55                  * ideally we should hold the io_req until RRQ complets,
  56                  * and release io_req from timeout hold.
  57                  */
  58                 spin_unlock_bh(&tgt->tgt_lock);
  59                 bnx2fc_send_rrq(io_req);
  60                 return;
  61         }
  62         if (test_and_clear_bit(BNX2FC_FLAG_RETIRE_OXID, &io_req->req_flags)) {
  63                 BNX2FC_IO_DBG(io_req, "IO ready for reuse now\n");
  64                 goto done;
  65         }
  66
  67         switch (cmd_type) {
  68         case BNX2FC_SCSI_CMD:
  69                 if (test_and_clear_bit(BNX2FC_FLAG_EH_ABORT,
  70                                                         &io_req->req_flags)) {
  71                         /* Handle eh_abort timeout */
  72                         BNX2FC_IO_DBG(io_req, "eh_abort timed out\n");
  73                         complete(&io_req->abts_done);
  74                 } else if (test_bit(BNX2FC_FLAG_ISSUE_ABTS,
  75                                     &io_req->req_flags)) {
  76                         /* Handle internally generated ABTS timeout */
  77                         BNX2FC_IO_DBG(io_req, "ABTS timed out refcnt = %d\n",
  78                                         kref_read(&io_req->refcount));
  79                         if (!(test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
  80                                                &io_req->req_flags))) {
  81                                 /*
  82                                  * Cleanup and return original command to
  83                                  * mid-layer.
  84                                  */
  85                                 bnx2fc_initiate_cleanup(io_req);
  86                                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
  87                                 spin_unlock_bh(&tgt->tgt_lock);
  88
  89                                 return;
  90                         }
  91                 } else {
  92                         /* Hanlde IO timeout */
  93                         BNX2FC_IO_DBG(io_req, "IO timed out. issue ABTS\n");
  94                         if (test_and_set_bit(BNX2FC_FLAG_IO_COMPL,
  95                                              &io_req->req_flags)) {
  96                                 BNX2FC_IO_DBG(io_req, "IO completed before "
  97                                                            " timer expiry\n");
  98                                 goto done;
  99                         }
 100
 101                         if (!test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS,
 102                                               &io_req->req_flags)) {
 103                                 rc = bnx2fc_initiate_abts(io_req);
 104                                 if (rc == SUCCESS)
 105                                         goto done;
 106
 107                                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
 108                                 spin_unlock_bh(&tgt->tgt_lock);
 109
 110                                 return;
 111                         } else {
 112                                 BNX2FC_IO_DBG(io_req, "IO already in "
 113                                                       "ABTS processing\n");
 114                         }
 115                 }
 116                 break;
 117         case BNX2FC_ELS:
 118
 119                 if (test_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags)) {
 120                         BNX2FC_IO_DBG(io_req, "ABTS for ELS timed out\n");
 121
 122                         if (!test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
 123                                               &io_req->req_flags)) {
 124                                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
 125                                 spin_unlock_bh(&tgt->tgt_lock);
 126
 127                                 return;
 128                         }
 129                 } else {
 130                         /*
 131                          * Handle ELS timeout.
 132                          * tgt_lock is used to sync compl path and timeout
 133                          * path. If els compl path is processing this IO, we
 134                          * have nothing to do here, just release the timer hold
 135                          */
 136                         BNX2FC_IO_DBG(io_req, "ELS timed out\n");
 137                         if (test_and_set_bit(BNX2FC_FLAG_ELS_DONE,
 138                                                &io_req->req_flags))
 139                                 goto done;
 140
 141                         /* Indicate the cb_func that this ELS is timed out */
 142                         set_bit(BNX2FC_FLAG_ELS_TIMEOUT, &io_req->req_flags);
 143
 144                         if ((io_req->cb_func) && (io_req->cb_arg)) {
 145                                 io_req->cb_func(io_req->cb_arg);
 146                                 io_req->cb_arg = NULL;
 147                         }
 148                 }
 149                 break;
 150         default:
 151                 printk(KERN_ERR PFX "cmd_timeout: invalid cmd_type %d\n",
 152                         cmd_type);
 153                 break;
 154         }
 155
 156 done:
 157         /* release the cmd that was held when timer was set */
 158         kref_put(&io_req->refcount, bnx2fc_cmd_release);
 159         spin_unlock_bh(&tgt->tgt_lock);
 160 }
 161
 162 static void bnx2fc_scsi_done(struct bnx2fc_cmd *io_req, int err_code)
 163 {
 164         /* Called with host lock held */
 165         struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
 166
 167         /*
 168          * active_cmd_queue may have other command types as well,
 169          * and during flush operation,  we want to error back only
 170          * scsi commands.
 171          */
 172         if (io_req->cmd_type != BNX2FC_SCSI_CMD)
 173                 return;
 174
 175         BNX2FC_IO_DBG(io_req, "scsi_done. err_code = 0x%x\n", err_code);
 176         if (test_bit(BNX2FC_FLAG_CMD_LOST, &io_req->req_flags)) {
 177                 /* Do not call scsi done for this IO */
 178                 return;
 179         }
 180
 181         bnx2fc_unmap_sg_list(io_req);
 182         io_req->sc_cmd = NULL;
 183
 184         /* Sanity checks before returning command to mid-layer */
 185         if (!sc_cmd) {
 186                 printk(KERN_ERR PFX "scsi_done - sc_cmd NULL. "
 187                                     "IO(0x%x) already cleaned up\n",
 188                        io_req->xid);
 189                 return;
 190         }
 191         if (!sc_cmd->device) {
 192                 pr_err(PFX "0x%x: sc_cmd->device is NULL.\n", io_req->xid);
 193                 return;
 194         }
 195         if (!sc_cmd->device->host) {
 196                 pr_err(PFX "0x%x: sc_cmd->device->host is NULL.\n",
 197                     io_req->xid);
 198                 return;
 199         }
 200
 201         sc_cmd->result = err_code << 16;
 202
 203         BNX2FC_IO_DBG(io_req, "sc=%p, result=0x%x, retries=%d, allowed=%d\n",
 204                 sc_cmd, host_byte(sc_cmd->result), sc_cmd->retries,
 205                 sc_cmd->allowed);
 206         scsi_set_resid(sc_cmd, scsi_bufflen(sc_cmd));
 207         bnx2fc_priv(sc_cmd)->io_req = NULL;
 208         scsi_done(sc_cmd);
 209 }
 210
 211 struct bnx2fc_cmd_mgr *bnx2fc_cmd_mgr_alloc(struct bnx2fc_hba *hba)
 212 {
 213         struct bnx2fc_cmd_mgr *cmgr;
 214         struct io_bdt *bdt_info;
 215         struct bnx2fc_cmd *io_req;
 216         size_t len;
 217         u32 mem_size;
 218         u16 xid;
 219         int i;
 220         int num_ios, num_pri_ios;
 221         size_t bd_tbl_sz;
 222         int arr_sz = num_possible_cpus() + 1;
 223         u16 min_xid = BNX2FC_MIN_XID;
 224         u16 max_xid = hba->max_xid;
 225
 226         if (max_xid <= min_xid || max_xid == FC_XID_UNKNOWN) {
 227                 printk(KERN_ERR PFX "cmd_mgr_alloc: Invalid min_xid 0x%x \
 228                                         and max_xid 0x%x\n", min_xid, max_xid);
 229                 return NULL;
 230         }
 231         BNX2FC_MISC_DBG("min xid 0x%x, max xid 0x%x\n", min_xid, max_xid);
 232
 233         num_ios = max_xid - min_xid + 1;
 234         len = (num_ios * (sizeof(struct bnx2fc_cmd *)));
 235         len += sizeof(struct bnx2fc_cmd_mgr);
 236
 237         cmgr = kzalloc(len, GFP_KERNEL);
 238         if (!cmgr) {
 239                 printk(KERN_ERR PFX "failed to alloc cmgr\n");
 240                 return NULL;
 241         }
 242
 243         cmgr->hba = hba;
 244         cmgr->free_list = kcalloc(arr_sz, sizeof(*cmgr->free_list),
 245                                   GFP_KERNEL);
 246         if (!cmgr->free_list) {
 247                 printk(KERN_ERR PFX "failed to alloc free_list\n");
 248                 goto mem_err;
 249         }
 250
 251         cmgr->free_list_lock = kcalloc(arr_sz, sizeof(*cmgr->free_list_lock),
 252                                        GFP_KERNEL);
 253         if (!cmgr->free_list_lock) {
 254                 printk(KERN_ERR PFX "failed to alloc free_list_lock\n");
 255                 kfree(cmgr->free_list);
 256                 cmgr->free_list = NULL;
 257                 goto mem_err;
 258         }
 259
 260         cmgr->cmds = (struct bnx2fc_cmd **)(cmgr + 1);
 261
 262         for (i = 0; i < arr_sz; i++)  {
 263                 INIT_LIST_HEAD(&cmgr->free_list[i]);
 264                 spin_lock_init(&cmgr->free_list_lock[i]);
 265         }
 266
 267         /*
 268          * Pre-allocated pool of bnx2fc_cmds.
 269          * Last entry in the free list array is the free list
 270          * of slow path requests.
 271          */
 272         xid = BNX2FC_MIN_XID;
 273         num_pri_ios = num_ios - hba->elstm_xids;
 274         for (i = 0; i < num_ios; i++) {
 275                 io_req = kzalloc(sizeof(*io_req), GFP_KERNEL);
 276
 277                 if (!io_req) {
 278                         printk(KERN_ERR PFX "failed to alloc io_req\n");
 279                         goto mem_err;
 280                 }
 281
 282                 INIT_LIST_HEAD(&io_req->link);
 283                 INIT_DELAYED_WORK(&io_req->timeout_work, bnx2fc_cmd_timeout);
 284
 285                 io_req->xid = xid++;
 286                 if (i < num_pri_ios)
 287                         list_add_tail(&io_req->link,
 288                                 &cmgr->free_list[io_req->xid %
 289                                                  num_possible_cpus()]);
 290                 else
 291                         list_add_tail(&io_req->link,
 292                                 &cmgr->free_list[num_possible_cpus()]);
 293                 io_req++;
 294         }
 295
 296         /* Allocate pool of io_bdts - one for each bnx2fc_cmd */
 297         mem_size = num_ios * sizeof(struct io_bdt *);
 298         cmgr->io_bdt_pool = kzalloc(mem_size, GFP_KERNEL);
 299         if (!cmgr->io_bdt_pool) {
 300                 printk(KERN_ERR PFX "failed to alloc io_bdt_pool\n");
 301                 goto mem_err;
 302         }
 303
 304         mem_size = sizeof(struct io_bdt);
 305         for (i = 0; i < num_ios; i++) {
 306                 cmgr->io_bdt_pool[i] = kmalloc(mem_size, GFP_KERNEL);
 307                 if (!cmgr->io_bdt_pool[i]) {
 308                         printk(KERN_ERR PFX "failed to alloc "
 309                                 "io_bdt_pool[%d]\n", i);
 310                         goto mem_err;
 311                 }
 312         }
 313
 314         /* Allocate an map fcoe_bdt_ctx structures */
 315         bd_tbl_sz = BNX2FC_MAX_BDS_PER_CMD * sizeof(struct fcoe_bd_ctx);
 316         for (i = 0; i < num_ios; i++) {
 317                 bdt_info = cmgr->io_bdt_pool[i];
 318                 bdt_info->bd_tbl = dma_alloc_coherent(&hba->pcidev->dev,
 319                                                       bd_tbl_sz,
 320                                                       &bdt_info->bd_tbl_dma,
 321                                                       GFP_KERNEL);
 322                 if (!bdt_info->bd_tbl) {
 323                         printk(KERN_ERR PFX "failed to alloc "
 324                                 "bdt_tbl[%d]\n", i);
 325                         goto mem_err;
 326                 }
 327         }
 328
 329         return cmgr;
 330
 331 mem_err:
 332         bnx2fc_cmd_mgr_free(cmgr);
 333         return NULL;
 334 }
 335
 336 void bnx2fc_cmd_mgr_free(struct bnx2fc_cmd_mgr *cmgr)
 337 {
 338         struct io_bdt *bdt_info;
 339         struct bnx2fc_hba *hba = cmgr->hba;
 340         size_t bd_tbl_sz;
 341         u16 min_xid = BNX2FC_MIN_XID;
 342         u16 max_xid = hba->max_xid;
 343         int num_ios;
 344         int i;
 345
 346         num_ios = max_xid - min_xid + 1;
 347
 348         /* Free fcoe_bdt_ctx structures */
 349         if (!cmgr->io_bdt_pool)
 350                 goto free_cmd_pool;
 351
 352         bd_tbl_sz = BNX2FC_MAX_BDS_PER_CMD * sizeof(struct fcoe_bd_ctx);
 353         for (i = 0; i < num_ios; i++) {
 354                 bdt_info = cmgr->io_bdt_pool[i];
 355                 if (bdt_info->bd_tbl) {
 356                         dma_free_coherent(&hba->pcidev->dev, bd_tbl_sz,
 357                                             bdt_info->bd_tbl,
 358                                             bdt_info->bd_tbl_dma);
 359                         bdt_info->bd_tbl = NULL;
 360                 }
 361         }
 362
 363         /* Destroy io_bdt pool */
 364         for (i = 0; i < num_ios; i++) {
 365                 kfree(cmgr->io_bdt_pool[i]);
 366                 cmgr->io_bdt_pool[i] = NULL;
 367         }
 368
 369         kfree(cmgr->io_bdt_pool);
 370         cmgr->io_bdt_pool = NULL;
 371
 372 free_cmd_pool:
 373         kfree(cmgr->free_list_lock);
 374
 375         /* Destroy cmd pool */
 376         if (!cmgr->free_list)
 377                 goto free_cmgr;
 378
 379         for (i = 0; i < num_possible_cpus() + 1; i++)  {
 380                 struct bnx2fc_cmd *tmp, *io_req;
 381
 382                 list_for_each_entry_safe(io_req, tmp,
 383                                          &cmgr->free_list[i], link) {
 384                         list_del(&io_req->link);
 385                         kfree(io_req);
 386                 }
 387         }
 388         kfree(cmgr->free_list);
 389 free_cmgr:
 390         /* Free command manager itself */
 391         kfree(cmgr);
 392 }
 393
 394 struct bnx2fc_cmd *bnx2fc_elstm_alloc(struct bnx2fc_rport *tgt, int type)
 395 {
 396         struct fcoe_port *port = tgt->port;
 397         struct bnx2fc_interface *interface = port->priv;
 398         struct bnx2fc_cmd_mgr *cmd_mgr = interface->hba->cmd_mgr;
 399         struct bnx2fc_cmd *io_req;
 400         struct list_head *listp;
 401         struct io_bdt *bd_tbl;
 402         int index = RESERVE_FREE_LIST_INDEX;
 403         u32 free_sqes;
 404         u32 max_sqes;
 405         u16 xid;
 406
 407         max_sqes = tgt->max_sqes;
 408         switch (type) {
 409         case BNX2FC_TASK_MGMT_CMD:
 410                 max_sqes = BNX2FC_TM_MAX_SQES;
 411                 break;
 412         case BNX2FC_ELS:
 413                 max_sqes = BNX2FC_ELS_MAX_SQES;
 414                 break;
 415         default:
 416                 break;
 417         }
 418
 419         /*
 420          * NOTE: Free list insertions and deletions are protected with
 421          * cmgr lock
 422          */
 423         spin_lock_bh(&cmd_mgr->free_list_lock[index]);
 424         free_sqes = atomic_read(&tgt->free_sqes);
 425         if ((list_empty(&(cmd_mgr->free_list[index]))) ||
 426             (tgt->num_active_ios.counter  >= max_sqes) ||
 427             (free_sqes + max_sqes <= BNX2FC_SQ_WQES_MAX)) {
 428                 BNX2FC_TGT_DBG(tgt, "No free els_tm cmds available "
 429                         "ios(%d):sqes(%d)\n",
 430                         tgt->num_active_ios.counter, tgt->max_sqes);
 431                 if (list_empty(&(cmd_mgr->free_list[index])))
 432                         printk(KERN_ERR PFX "elstm_alloc: list_empty\n");
 433                 spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
 434                 return NULL;
 435         }
 436
 437         listp = (struct list_head *)
 438                         cmd_mgr->free_list[index].next;
 439         list_del_init(listp);
 440         io_req = (struct bnx2fc_cmd *) listp;
 441         xid = io_req->xid;
 442         cmd_mgr->cmds[xid] = io_req;
 443         atomic_inc(&tgt->num_active_ios);
 444         atomic_dec(&tgt->free_sqes);
 445         spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
 446
 447         INIT_LIST_HEAD(&io_req->link);
 448
 449         io_req->port = port;
 450         io_req->cmd_mgr = cmd_mgr;
 451         io_req->req_flags = 0;
 452         io_req->cmd_type = type;
 453
 454         /* Bind io_bdt for this io_req */
 455         /* Have a static link between io_req and io_bdt_pool */
 456         bd_tbl = io_req->bd_tbl = cmd_mgr->io_bdt_pool[xid];
 457         bd_tbl->io_req = io_req;
 458
 459         /* Hold the io_req  against deletion */
 460         kref_init(&io_req->refcount);
 461         return io_req;
 462 }
 463
 464 struct bnx2fc_cmd *bnx2fc_cmd_alloc(struct bnx2fc_rport *tgt)
 465 {
 466         struct fcoe_port *port = tgt->port;
 467         struct bnx2fc_interface *interface = port->priv;
 468         struct bnx2fc_cmd_mgr *cmd_mgr = interface->hba->cmd_mgr;
 469         struct bnx2fc_cmd *io_req;
 470         struct list_head *listp;
 471         struct io_bdt *bd_tbl;
 472         u32 free_sqes;
 473         u32 max_sqes;
 474         u16 xid;
 475         int index = raw_smp_processor_id();
 476
 477         max_sqes = BNX2FC_SCSI_MAX_SQES;
 478         /*
 479          * NOTE: Free list insertions and deletions are protected with
 480          * cmgr lock
 481          */
 482         spin_lock_bh(&cmd_mgr->free_list_lock[index]);
 483         free_sqes = atomic_read(&tgt->free_sqes);
 484         if ((list_empty(&cmd_mgr->free_list[index])) ||
 485             (tgt->num_active_ios.counter  >= max_sqes) ||
 486             (free_sqes + max_sqes <= BNX2FC_SQ_WQES_MAX)) {
 487                 spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
 488                 return NULL;
 489         }
 490
 491         listp = (struct list_head *)
 492                 cmd_mgr->free_list[index].next;
 493         list_del_init(listp);
 494         io_req = (struct bnx2fc_cmd *) listp;
 495         xid = io_req->xid;
 496         cmd_mgr->cmds[xid] = io_req;
 497         atomic_inc(&tgt->num_active_ios);
 498         atomic_dec(&tgt->free_sqes);
 499         spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
 500
 501         INIT_LIST_HEAD(&io_req->link);
 502
 503         io_req->port = port;
 504         io_req->cmd_mgr = cmd_mgr;
 505         io_req->req_flags = 0;
 506
 507         /* Bind io_bdt for this io_req */
 508         /* Have a static link between io_req and io_bdt_pool */
 509         bd_tbl = io_req->bd_tbl = cmd_mgr->io_bdt_pool[xid];
 510         bd_tbl->io_req = io_req;
 511
 512         /* Hold the io_req  against deletion */
 513         kref_init(&io_req->refcount);
 514         return io_req;
 515 }
 516
 517 void bnx2fc_cmd_release(struct kref *ref)
 518 {
 519         struct bnx2fc_cmd *io_req = container_of(ref,
 520                                                 struct bnx2fc_cmd, refcount);
 521         struct bnx2fc_cmd_mgr *cmd_mgr = io_req->cmd_mgr;
 522         int index;
 523
 524         if (io_req->cmd_type == BNX2FC_SCSI_CMD)
 525                 index = io_req->xid % num_possible_cpus();
 526         else
 527                 index = RESERVE_FREE_LIST_INDEX;
 528
 529
 530         spin_lock_bh(&cmd_mgr->free_list_lock[index]);
 531         if (io_req->cmd_type != BNX2FC_SCSI_CMD)
 532                 bnx2fc_free_mp_resc(io_req);
 533         cmd_mgr->cmds[io_req->xid] = NULL;
 534         /* Delete IO from retire queue */
 535         list_del_init(&io_req->link);
 536         /* Add it to the free list */
 537         list_add(&io_req->link,
 538                         &cmd_mgr->free_list[index]);
 539         atomic_dec(&io_req->tgt->num_active_ios);
 540         spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
 541
 542 }
 543
 544 static void bnx2fc_free_mp_resc(struct bnx2fc_cmd *io_req)
 545 {
 546         struct bnx2fc_mp_req *mp_req = &(io_req->mp_req);
 547         struct bnx2fc_interface *interface = io_req->port->priv;
 548         struct bnx2fc_hba *hba = interface->hba;
 549         size_t sz = sizeof(struct fcoe_bd_ctx);
 550
 551         /* clear tm flags */
 552         mp_req->tm_flags = 0;
 553         if (mp_req->mp_req_bd) {
 554                 dma_free_coherent(&hba->pcidev->dev, sz,
 555                                      mp_req->mp_req_bd,
 556                                      mp_req->mp_req_bd_dma);
 557                 mp_req->mp_req_bd = NULL;
 558         }
 559         if (mp_req->mp_resp_bd) {
 560                 dma_free_coherent(&hba->pcidev->dev, sz,
 561                                      mp_req->mp_resp_bd,
 562                                      mp_req->mp_resp_bd_dma);
 563                 mp_req->mp_resp_bd = NULL;
 564         }
 565         if (mp_req->req_buf) {
 566                 dma_free_coherent(&hba->pcidev->dev, CNIC_PAGE_SIZE,
 567                                      mp_req->req_buf,
 568                                      mp_req->req_buf_dma);
 569                 mp_req->req_buf = NULL;
 570         }
 571         if (mp_req->resp_buf) {
 572                 dma_free_coherent(&hba->pcidev->dev, CNIC_PAGE_SIZE,
 573                                      mp_req->resp_buf,
 574                                      mp_req->resp_buf_dma);
 575                 mp_req->resp_buf = NULL;
 576         }
 577 }
 578
 579 int bnx2fc_init_mp_req(struct bnx2fc_cmd *io_req)
 580 {
 581         struct bnx2fc_mp_req *mp_req;
 582         struct fcoe_bd_ctx *mp_req_bd;
 583         struct fcoe_bd_ctx *mp_resp_bd;
 584         struct bnx2fc_interface *interface = io_req->port->priv;
 585         struct bnx2fc_hba *hba = interface->hba;
 586         dma_addr_t addr;
 587         size_t sz;
 588
 589         mp_req = (struct bnx2fc_mp_req *)&(io_req->mp_req);
 590         memset(mp_req, 0, sizeof(struct bnx2fc_mp_req));
 591
 592         if (io_req->cmd_type != BNX2FC_ELS) {
 593                 mp_req->req_len = sizeof(struct fcp_cmnd);
 594                 io_req->data_xfer_len = mp_req->req_len;
 595         } else
 596                 mp_req->req_len = io_req->data_xfer_len;
 597
 598         mp_req->req_buf = dma_alloc_coherent(&hba->pcidev->dev, CNIC_PAGE_SIZE,
 599                                              &mp_req->req_buf_dma,
 600                                              GFP_ATOMIC);
 601         if (!mp_req->req_buf) {
 602                 printk(KERN_ERR PFX "unable to alloc MP req buffer\n");
 603                 bnx2fc_free_mp_resc(io_req);
 604                 return FAILED;
 605         }
 606
 607         mp_req->resp_buf = dma_alloc_coherent(&hba->pcidev->dev, CNIC_PAGE_SIZE,
 608                                               &mp_req->resp_buf_dma,
 609                                               GFP_ATOMIC);
 610         if (!mp_req->resp_buf) {
 611                 printk(KERN_ERR PFX "unable to alloc TM resp buffer\n");
 612                 bnx2fc_free_mp_resc(io_req);
 613                 return FAILED;
 614         }
 615         memset(mp_req->req_buf, 0, CNIC_PAGE_SIZE);
 616         memset(mp_req->resp_buf, 0, CNIC_PAGE_SIZE);
 617
 618         /* Allocate and map mp_req_bd and mp_resp_bd */
 619         sz = sizeof(struct fcoe_bd_ctx);
 620         mp_req->mp_req_bd = dma_alloc_coherent(&hba->pcidev->dev, sz,
 621                                                  &mp_req->mp_req_bd_dma,
 622                                                  GFP_ATOMIC);
 623         if (!mp_req->mp_req_bd) {
 624                 printk(KERN_ERR PFX "unable to alloc MP req bd\n");
 625                 bnx2fc_free_mp_resc(io_req);
 626                 return FAILED;
 627         }
 628         mp_req->mp_resp_bd = dma_alloc_coherent(&hba->pcidev->dev, sz,
 629                                                  &mp_req->mp_resp_bd_dma,
 630                                                  GFP_ATOMIC);
 631         if (!mp_req->mp_resp_bd) {
 632                 printk(KERN_ERR PFX "unable to alloc MP resp bd\n");
 633                 bnx2fc_free_mp_resc(io_req);
 634                 return FAILED;
 635         }
 636         /* Fill bd table */
 637         addr = mp_req->req_buf_dma;
 638         mp_req_bd = mp_req->mp_req_bd;
 639         mp_req_bd->buf_addr_lo = (u32)addr & 0xffffffff;
 640         mp_req_bd->buf_addr_hi = (u32)((u64)addr >> 32);
 641         mp_req_bd->buf_len = CNIC_PAGE_SIZE;
 642         mp_req_bd->flags = 0;
 643
 644         /*
 645          * MP buffer is either a task mgmt command or an ELS.
 646          * So the assumption is that it consumes a single bd
 647          * entry in the bd table
 648          */
 649         mp_resp_bd = mp_req->mp_resp_bd;
 650         addr = mp_req->resp_buf_dma;
 651         mp_resp_bd->buf_addr_lo = (u32)addr & 0xffffffff;
 652         mp_resp_bd->buf_addr_hi = (u32)((u64)addr >> 32);
 653         mp_resp_bd->buf_len = CNIC_PAGE_SIZE;
 654         mp_resp_bd->flags = 0;
 655
 656         return SUCCESS;
 657 }
 658
 659 static int bnx2fc_initiate_tmf(struct fc_lport *lport, struct fc_rport *rport,
 660                                u64 tm_lun, u8 tm_flags)
 661 {
 662         struct fc_rport_libfc_priv *rp;
 663         struct fcoe_port *port;
 664         struct bnx2fc_interface *interface;
 665         struct bnx2fc_rport *tgt;
 666         struct bnx2fc_cmd *io_req;
 667         struct bnx2fc_mp_req *tm_req;
 668         struct fcoe_task_ctx_entry *task;
 669         struct fcoe_task_ctx_entry *task_page;
 670         struct fc_frame_header *fc_hdr;
 671         struct fcp_cmnd *fcp_cmnd;
 672         int task_idx, index;
 673         int rc = SUCCESS;
 674         u16 xid;
 675         u32 sid, did;
 676         unsigned long start = jiffies;
 677
 678         port = lport_priv(lport);
 679         interface = port->priv;
 680
 681         if (rport == NULL) {
 682                 printk(KERN_ERR PFX "device_reset: rport is NULL\n");
 683                 rc = FAILED;
 684                 goto tmf_err;
 685         }
 686         rp = rport->dd_data;
 687
 688         rc = fc_block_rport(rport);
 689         if (rc)
 690                 return rc;
 691
 692         if (lport->state != LPORT_ST_READY || !(lport->link_up)) {
 693                 printk(KERN_ERR PFX "device_reset: link is not ready\n");
 694                 rc = FAILED;
 695                 goto tmf_err;
 696         }
 697         /* rport and tgt are allocated together, so tgt should be non-NULL */
 698         tgt = (struct bnx2fc_rport *)&rp[1];
 699
 700         if (!(test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags))) {
 701                 printk(KERN_ERR PFX "device_reset: tgt not offloaded\n");
 702                 rc = FAILED;
 703                 goto tmf_err;
 704         }
 705 retry_tmf:
 706         io_req = bnx2fc_elstm_alloc(tgt, BNX2FC_TASK_MGMT_CMD);
 707         if (!io_req) {
 708                 if (time_after(jiffies, start + HZ)) {
 709                         printk(KERN_ERR PFX "tmf: Failed TMF");
 710                         rc = FAILED;
 711                         goto tmf_err;
 712                 }
 713                 msleep(20);
 714                 goto retry_tmf;
 715         }
 716         /* Initialize rest of io_req fields */
 717         io_req->sc_cmd = NULL;
 718         io_req->port = port;
 719         io_req->tgt = tgt;
 720
 721         tm_req = (struct bnx2fc_mp_req *)&(io_req->mp_req);
 722
 723         rc = bnx2fc_init_mp_req(io_req);
 724         if (rc == FAILED) {
 725                 printk(KERN_ERR PFX "Task mgmt MP request init failed\n");
 726                 spin_lock_bh(&tgt->tgt_lock);
 727                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
 728                 spin_unlock_bh(&tgt->tgt_lock);
 729                 goto tmf_err;
 730         }
 731
 732         /* Set TM flags */
 733         io_req->io_req_flags = 0;
 734         tm_req->tm_flags = tm_flags;
 735         tm_req->tm_lun = tm_lun;
 736
 737         /* Fill FCP_CMND */
 738         bnx2fc_build_fcp_cmnd(io_req, (struct fcp_cmnd *)tm_req->req_buf);
 739         fcp_cmnd = (struct fcp_cmnd *)tm_req->req_buf;
 740         int_to_scsilun(tm_lun, &fcp_cmnd->fc_lun);
 741         memset(fcp_cmnd->fc_cdb, 0,  BNX2FC_MAX_CMD_LEN);
 742         fcp_cmnd->fc_dl = 0;
 743
 744         /* Fill FC header */
 745         fc_hdr = &(tm_req->req_fc_hdr);
 746         sid = tgt->sid;
 747         did = rport->port_id;
 748         __fc_fill_fc_hdr(fc_hdr, FC_RCTL_DD_UNSOL_CMD, did, sid,
 749                            FC_TYPE_FCP, FC_FC_FIRST_SEQ | FC_FC_END_SEQ |
 750                            FC_FC_SEQ_INIT, 0);
 751         /* Obtain exchange id */
 752         xid = io_req->xid;
 753
 754         BNX2FC_TGT_DBG(tgt, "Initiate TMF - xid = 0x%x\n", xid);
 755         task_idx = xid/BNX2FC_TASKS_PER_PAGE;
 756         index = xid % BNX2FC_TASKS_PER_PAGE;
 757
 758         /* Initialize task context for this IO request */
 759         task_page = (struct fcoe_task_ctx_entry *)
 760                         interface->hba->task_ctx[task_idx];
 761         task = &(task_page[index]);
 762         bnx2fc_init_mp_task(io_req, task);
 763
 764         /* Obtain free SQ entry */
 765         spin_lock_bh(&tgt->tgt_lock);
 766         bnx2fc_add_2_sq(tgt, xid);
 767
 768         /* Enqueue the io_req to active_tm_queue */
 769         io_req->on_tmf_queue = 1;
 770         list_add_tail(&io_req->link, &tgt->active_tm_queue);
 771
 772         init_completion(&io_req->abts_done);
 773         io_req->wait_for_abts_comp = 1;
 774
 775         /* Ring doorbell */
 776         bnx2fc_ring_doorbell(tgt);
 777         spin_unlock_bh(&tgt->tgt_lock);
 778
 779         rc = wait_for_completion_timeout(&io_req->abts_done,
 780                                          interface->tm_timeout * HZ);
 781         spin_lock_bh(&tgt->tgt_lock);
 782
 783         io_req->wait_for_abts_comp = 0;
 784         if (!(test_bit(BNX2FC_FLAG_TM_COMPL, &io_req->req_flags))) {
 785                 set_bit(BNX2FC_FLAG_TM_TIMEOUT, &io_req->req_flags);
 786                 if (io_req->on_tmf_queue) {
 787                         list_del_init(&io_req->link);
 788                         io_req->on_tmf_queue = 0;
 789                 }
 790                 io_req->wait_for_cleanup_comp = 1;
 791                 init_completion(&io_req->cleanup_done);
 792                 bnx2fc_initiate_cleanup(io_req);
 793                 spin_unlock_bh(&tgt->tgt_lock);
 794                 rc = wait_for_completion_timeout(&io_req->cleanup_done,
 795                                                  BNX2FC_FW_TIMEOUT);
 796                 spin_lock_bh(&tgt->tgt_lock);
 797                 io_req->wait_for_cleanup_comp = 0;
 798                 if (!rc)
 799                         kref_put(&io_req->refcount, bnx2fc_cmd_release);
 800         }
 801
 802         spin_unlock_bh(&tgt->tgt_lock);
 803
 804         if (!rc) {
 805                 BNX2FC_TGT_DBG(tgt, "task mgmt command failed...\n");
 806                 rc = FAILED;
 807         } else {
 808                 BNX2FC_TGT_DBG(tgt, "task mgmt command success...\n");
 809                 rc = SUCCESS;
 810         }
 811 tmf_err:
 812         return rc;
 813 }
 814
 815 int bnx2fc_initiate_abts(struct bnx2fc_cmd *io_req)
 816 {
 817         struct fc_lport *lport;
 818         struct bnx2fc_rport *tgt = io_req->tgt;
 819         struct fc_rport *rport = tgt->rport;
 820         struct fc_rport_priv *rdata = tgt->rdata;
 821         struct bnx2fc_interface *interface;
 822         struct fcoe_port *port;
 823         struct bnx2fc_cmd *abts_io_req;
 824         struct fcoe_task_ctx_entry *task;
 825         struct fcoe_task_ctx_entry *task_page;
 826         struct fc_frame_header *fc_hdr;
 827         struct bnx2fc_mp_req *abts_req;
 828         int task_idx, index;
 829         u32 sid, did;
 830         u16 xid;
 831         int rc = SUCCESS;
 832         u32 r_a_tov = rdata->r_a_tov;
 833
 834         /* called with tgt_lock held */
 835         BNX2FC_IO_DBG(io_req, "Entered bnx2fc_initiate_abts\n");
 836
 837         port = io_req->port;
 838         interface = port->priv;
 839         lport = port->lport;
 840
 841         if (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags)) {
 842                 printk(KERN_ERR PFX "initiate_abts: tgt not offloaded\n");
 843                 rc = FAILED;
 844                 goto abts_err;
 845         }
 846
 847         if (rport == NULL) {
 848                 printk(KERN_ERR PFX "initiate_abts: rport is NULL\n");
 849                 rc = FAILED;
 850                 goto abts_err;
 851         }
 852
 853         if (lport->state != LPORT_ST_READY || !(lport->link_up)) {
 854                 printk(KERN_ERR PFX "initiate_abts: link is not ready\n");
 855                 rc = FAILED;
 856                 goto abts_err;
 857         }
 858
 859         abts_io_req = bnx2fc_elstm_alloc(tgt, BNX2FC_ABTS);
 860         if (!abts_io_req) {
 861                 printk(KERN_ERR PFX "abts: couldn't allocate cmd\n");
 862                 rc = FAILED;
 863                 goto abts_err;
 864         }
 865
 866         /* Initialize rest of io_req fields */
 867         abts_io_req->sc_cmd = NULL;
 868         abts_io_req->port = port;
 869         abts_io_req->tgt = tgt;
 870         abts_io_req->data_xfer_len = 0; /* No data transfer for ABTS */
 871
 872         abts_req = (struct bnx2fc_mp_req *)&(abts_io_req->mp_req);
 873         memset(abts_req, 0, sizeof(struct bnx2fc_mp_req));
 874
 875         /* Fill FC header */
 876         fc_hdr = &(abts_req->req_fc_hdr);
 877
 878         /* Obtain oxid and rxid for the original exchange to be aborted */
 879         fc_hdr->fh_ox_id = htons(io_req->xid);
 880         fc_hdr->fh_rx_id = htons(io_req->task->rxwr_txrd.var_ctx.rx_id);
 881
 882         sid = tgt->sid;
 883         did = rport->port_id;
 884
 885         __fc_fill_fc_hdr(fc_hdr, FC_RCTL_BA_ABTS, did, sid,
 886                            FC_TYPE_BLS, FC_FC_FIRST_SEQ | FC_FC_END_SEQ |
 887                            FC_FC_SEQ_INIT, 0);
 888
 889         xid = abts_io_req->xid;
 890         BNX2FC_IO_DBG(abts_io_req, "ABTS io_req\n");
 891         task_idx = xid/BNX2FC_TASKS_PER_PAGE;
 892         index = xid % BNX2FC_TASKS_PER_PAGE;
 893
 894         /* Initialize task context for this IO request */
 895         task_page = (struct fcoe_task_ctx_entry *)
 896                         interface->hba->task_ctx[task_idx];
 897         task = &(task_page[index]);
 898         bnx2fc_init_mp_task(abts_io_req, task);
 899
 900         /*
 901          * ABTS task is a temporary task that will be cleaned up
 902          * irrespective of ABTS response. We need to start the timer
 903          * for the original exchange, as the CQE is posted for the original
 904          * IO request.
 905          *
 906          * Timer for ABTS is started only when it is originated by a
 907          * TM request. For the ABTS issued as part of ULP timeout,
 908          * scsi-ml maintains the timers.
 909          */
 910
 911         /* if (test_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags))*/
 912         bnx2fc_cmd_timer_set(io_req, 2 * r_a_tov);
 913
 914         /* Obtain free SQ entry */
 915         bnx2fc_add_2_sq(tgt, xid);
 916
 917         /* Ring doorbell */
 918         bnx2fc_ring_doorbell(tgt);
 919
 920 abts_err:
 921         return rc;
 922 }
 923
 924 int bnx2fc_initiate_seq_cleanup(struct bnx2fc_cmd *orig_io_req, u32 offset,
 925                                 enum fc_rctl r_ctl)
 926 {
 927         struct bnx2fc_rport *tgt = orig_io_req->tgt;
 928         struct bnx2fc_interface *interface;
 929         struct fcoe_port *port;
 930         struct bnx2fc_cmd *seq_clnp_req;
 931         struct fcoe_task_ctx_entry *task;
 932         struct fcoe_task_ctx_entry *task_page;
 933         struct bnx2fc_els_cb_arg *cb_arg = NULL;
 934         int task_idx, index;
 935         u16 xid;
 936         int rc = 0;
 937
 938         BNX2FC_IO_DBG(orig_io_req, "bnx2fc_initiate_seq_cleanup xid = 0x%x\n",
 939                    orig_io_req->xid);
 940         kref_get(&orig_io_req->refcount);
 941
 942         port = orig_io_req->port;
 943         interface = port->priv;
 944
 945         cb_arg = kzalloc(sizeof(struct bnx2fc_els_cb_arg), GFP_ATOMIC);
 946         if (!cb_arg) {
 947                 printk(KERN_ERR PFX "Unable to alloc cb_arg for seq clnup\n");
 948                 rc = -ENOMEM;
 949                 goto cleanup_err;
 950         }
 951
 952         seq_clnp_req = bnx2fc_elstm_alloc(tgt, BNX2FC_SEQ_CLEANUP);
 953         if (!seq_clnp_req) {
 954                 printk(KERN_ERR PFX "cleanup: couldn't allocate cmd\n");
 955                 rc = -ENOMEM;
 956                 kfree(cb_arg);
 957                 goto cleanup_err;
 958         }
 959         /* Initialize rest of io_req fields */
 960         seq_clnp_req->sc_cmd = NULL;
 961         seq_clnp_req->port = port;
 962         seq_clnp_req->tgt = tgt;
 963         seq_clnp_req->data_xfer_len = 0; /* No data transfer for cleanup */
 964
 965         xid = seq_clnp_req->xid;
 966
 967         task_idx = xid/BNX2FC_TASKS_PER_PAGE;
 968         index = xid % BNX2FC_TASKS_PER_PAGE;
 969
 970         /* Initialize task context for this IO request */
 971         task_page = (struct fcoe_task_ctx_entry *)
 972                      interface->hba->task_ctx[task_idx];
 973         task = &(task_page[index]);
 974         cb_arg->aborted_io_req = orig_io_req;
 975         cb_arg->io_req = seq_clnp_req;
 976         cb_arg->r_ctl = r_ctl;
 977         cb_arg->offset = offset;
 978         seq_clnp_req->cb_arg = cb_arg;
 979
 980         printk(KERN_ERR PFX "call init_seq_cleanup_task\n");
 981         bnx2fc_init_seq_cleanup_task(seq_clnp_req, task, orig_io_req, offset);
 982
 983         /* Obtain free SQ entry */
 984         bnx2fc_add_2_sq(tgt, xid);
 985
 986         /* Ring doorbell */
 987         bnx2fc_ring_doorbell(tgt);
 988 cleanup_err:
 989         return rc;
 990 }
 991
 992 int bnx2fc_initiate_cleanup(struct bnx2fc_cmd *io_req)
 993 {
 994         struct bnx2fc_rport *tgt = io_req->tgt;
 995         struct bnx2fc_interface *interface;
 996         struct fcoe_port *port;
 997         struct bnx2fc_cmd *cleanup_io_req;
 998         struct fcoe_task_ctx_entry *task;
 999         struct fcoe_task_ctx_entry *task_page;
1000         int task_idx, index;
1001         u16 xid, orig_xid;
1002         int rc = 0;
1003
1004         /* ASSUMPTION: called with tgt_lock held */
1005         BNX2FC_IO_DBG(io_req, "Entered bnx2fc_initiate_cleanup\n");
1006
1007         port = io_req->port;
1008         interface = port->priv;
1009
1010         cleanup_io_req = bnx2fc_elstm_alloc(tgt, BNX2FC_CLEANUP);
1011         if (!cleanup_io_req) {
1012                 printk(KERN_ERR PFX "cleanup: couldn't allocate cmd\n");
1013                 rc = -1;
1014                 goto cleanup_err;
1015         }
1016
1017         /* Initialize rest of io_req fields */
1018         cleanup_io_req->sc_cmd = NULL;
1019         cleanup_io_req->port = port;
1020         cleanup_io_req->tgt = tgt;
1021         cleanup_io_req->data_xfer_len = 0; /* No data transfer for cleanup */
1022
1023         xid = cleanup_io_req->xid;
1024
1025         task_idx = xid/BNX2FC_TASKS_PER_PAGE;
1026         index = xid % BNX2FC_TASKS_PER_PAGE;
1027
1028         /* Initialize task context for this IO request */
1029         task_page = (struct fcoe_task_ctx_entry *)
1030                         interface->hba->task_ctx[task_idx];
1031         task = &(task_page[index]);
1032         orig_xid = io_req->xid;
1033
1034         BNX2FC_IO_DBG(io_req, "CLEANUP io_req xid = 0x%x\n", xid);
1035
1036         bnx2fc_init_cleanup_task(cleanup_io_req, task, orig_xid);
1037
1038         /* Obtain free SQ entry */
1039         bnx2fc_add_2_sq(tgt, xid);
1040
1041         /* Set flag that cleanup request is pending with the firmware */
1042         set_bit(BNX2FC_FLAG_ISSUE_CLEANUP_REQ, &io_req->req_flags);
1043
1044         /* Ring doorbell */
1045         bnx2fc_ring_doorbell(tgt);
1046
1047 cleanup_err:
1048         return rc;
1049 }
1050
1051 /**
1052  * bnx2fc_eh_target_reset: Reset a target
1053  *
1054  * @sc_cmd:     SCSI command
1055  *
1056  * Set from SCSI host template to send task mgmt command to the target
1057  *      and wait for the response
1058  */
1059 int bnx2fc_eh_target_reset(struct scsi_cmnd *sc_cmd)
1060 {
1061         struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
1062         struct fc_lport *lport = shost_priv(rport_to_shost(rport));
1063
1064         return bnx2fc_initiate_tmf(lport, rport, 0, FCP_TMF_TGT_RESET);
1065 }
1066
1067 /**
1068  * bnx2fc_eh_device_reset - Reset a single LUN
1069  *
1070  * @sc_cmd:     SCSI command
1071  *
1072  * Set from SCSI host template to send task mgmt command to the target
1073  *      and wait for the response
1074  */
1075 int bnx2fc_eh_device_reset(struct scsi_cmnd *sc_cmd)
1076 {
1077         struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
1078         struct fc_lport *lport = shost_priv(rport_to_shost(rport));
1079
1080         return bnx2fc_initiate_tmf(lport, rport, sc_cmd->device->lun,
1081                                    FCP_TMF_LUN_RESET);
1082 }
1083
1084 static int bnx2fc_abts_cleanup(struct bnx2fc_cmd *io_req)
1085         __must_hold(&tgt->tgt_lock)
1086 {
1087         struct bnx2fc_rport *tgt = io_req->tgt;
1088         unsigned int time_left;
1089
1090         init_completion(&io_req->cleanup_done);
1091         io_req->wait_for_cleanup_comp = 1;
1092         bnx2fc_initiate_cleanup(io_req);
1093
1094         spin_unlock_bh(&tgt->tgt_lock);
1095
1096         /*
1097          * Can't wait forever on cleanup response lest we let the SCSI error
1098          * handler wait forever
1099          */
1100         time_left = wait_for_completion_timeout(&io_req->cleanup_done,
1101                                                 BNX2FC_FW_TIMEOUT);
1102         if (!time_left) {
1103                 BNX2FC_IO_DBG(io_req, "%s(): Wait for cleanup timed out.\n",
1104                               __func__);
1105
1106                 /*
1107                  * Put the extra reference to the SCSI command since it would
1108                  * not have been returned in this case.
1109                  */
1110                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1111         }
1112
1113         spin_lock_bh(&tgt->tgt_lock);
1114         io_req->wait_for_cleanup_comp = 0;
1115         return SUCCESS;
1116 }
1117
1118 /**
1119  * bnx2fc_eh_abort - eh_abort_handler api to abort an outstanding
1120  *                      SCSI command
1121  *
1122  * @sc_cmd:     SCSI_ML command pointer
1123  *
1124  * SCSI abort request handler
1125  */
1126 int bnx2fc_eh_abort(struct scsi_cmnd *sc_cmd)
1127 {
1128         struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
1129         struct fc_rport_libfc_priv *rp = rport->dd_data;
1130         struct bnx2fc_cmd *io_req;
1131         struct fc_lport *lport;
1132         struct bnx2fc_rport *tgt;
1133         int rc;
1134         unsigned int time_left;
1135
1136         rc = fc_block_scsi_eh(sc_cmd);
1137         if (rc)
1138                 return rc;
1139
1140         lport = shost_priv(sc_cmd->device->host);
1141         if ((lport->state != LPORT_ST_READY) || !(lport->link_up)) {
1142                 printk(KERN_ERR PFX "eh_abort: link not ready\n");
1143                 return FAILED;
1144         }
1145
1146         tgt = (struct bnx2fc_rport *)&rp[1];
1147
1148         BNX2FC_TGT_DBG(tgt, "Entered bnx2fc_eh_abort\n");
1149
1150         spin_lock_bh(&tgt->tgt_lock);
1151         io_req = bnx2fc_priv(sc_cmd)->io_req;
1152         if (!io_req) {
1153                 /* Command might have just completed */
1154                 printk(KERN_ERR PFX "eh_abort: io_req is NULL\n");
1155                 spin_unlock_bh(&tgt->tgt_lock);
1156                 return SUCCESS;
1157         }
1158         BNX2FC_IO_DBG(io_req, "eh_abort - refcnt = %d\n",
1159                       kref_read(&io_req->refcount));
1160
1161         /* Hold IO request across abort processing */
1162         kref_get(&io_req->refcount);
1163
1164         BUG_ON(tgt != io_req->tgt);
1165
1166         /* Remove the io_req from the active_q. */
1167         /*
1168          * Task Mgmt functions (LUN RESET & TGT RESET) will not
1169          * issue an ABTS on this particular IO req, as the
1170          * io_req is no longer in the active_q.
1171          */
1172         if (tgt->flush_in_prog) {
1173                 printk(KERN_ERR PFX "eh_abort: io_req (xid = 0x%x) "
1174                         "flush in progress\n", io_req->xid);
1175                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1176                 spin_unlock_bh(&tgt->tgt_lock);
1177                 return SUCCESS;
1178         }
1179
1180         if (io_req->on_active_queue == 0) {
1181                 printk(KERN_ERR PFX "eh_abort: io_req (xid = 0x%x) "
1182                                 "not on active_q\n", io_req->xid);
1183                 /*
1184                  * The IO is still with the FW.
1185                  * Return failure and let SCSI-ml retry eh_abort.
1186                  */
1187                 spin_unlock_bh(&tgt->tgt_lock);
1188                 return FAILED;
1189         }
1190
1191         /*
1192          * Only eh_abort processing will remove the IO from
1193          * active_cmd_q before processing the request. this is
1194          * done to avoid race conditions between IOs aborted
1195          * as part of task management completion and eh_abort
1196          * processing
1197          */
1198         list_del_init(&io_req->link);
1199         io_req->on_active_queue = 0;
1200         /* Move IO req to retire queue */
1201         list_add_tail(&io_req->link, &tgt->io_retire_queue);
1202
1203         init_completion(&io_req->abts_done);
1204         init_completion(&io_req->cleanup_done);
1205
1206         if (test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags)) {
1207                 printk(KERN_ERR PFX "eh_abort: io_req (xid = 0x%x) "
1208                                 "already in abts processing\n", io_req->xid);
1209                 if (cancel_delayed_work(&io_req->timeout_work))
1210                         kref_put(&io_req->refcount,
1211                                  bnx2fc_cmd_release); /* drop timer hold */
1212                 /*
1213                  * We don't want to hold off the upper layer timer so simply
1214                  * cleanup the command and return that I/O was successfully
1215                  * aborted.
1216                  */
1217                 bnx2fc_abts_cleanup(io_req);
1218                 /* This only occurs when an task abort was requested while ABTS
1219                    is in progress.  Setting the IO_CLEANUP flag will skip the
1220                    RRQ process in the case when the fw generated SCSI_CMD cmpl
1221                    was a result from the ABTS request rather than the CLEANUP
1222                    request */
1223                 set_bit(BNX2FC_FLAG_IO_CLEANUP, &io_req->req_flags);
1224                 rc = FAILED;
1225                 goto done;
1226         }
1227
1228         /* Cancel the current timer running on this io_req */
1229         if (cancel_delayed_work(&io_req->timeout_work))
1230                 kref_put(&io_req->refcount,
1231                          bnx2fc_cmd_release); /* drop timer hold */
1232         set_bit(BNX2FC_FLAG_EH_ABORT, &io_req->req_flags);
1233         io_req->wait_for_abts_comp = 1;
1234         rc = bnx2fc_initiate_abts(io_req);
1235         if (rc == FAILED) {
1236                 io_req->wait_for_cleanup_comp = 1;
1237                 bnx2fc_initiate_cleanup(io_req);
1238                 spin_unlock_bh(&tgt->tgt_lock);
1239                 wait_for_completion(&io_req->cleanup_done);
1240                 spin_lock_bh(&tgt->tgt_lock);
1241                 io_req->wait_for_cleanup_comp = 0;
1242                 goto done;
1243         }
1244         spin_unlock_bh(&tgt->tgt_lock);
1245
1246         /* Wait 2 * RA_TOV + 1 to be sure timeout function hasn't fired */
1247         time_left = wait_for_completion_timeout(&io_req->abts_done,
1248                                         msecs_to_jiffies(2 * rp->r_a_tov + 1));
1249         if (time_left)
1250                 BNX2FC_IO_DBG(io_req,
1251                               "Timed out in eh_abort waiting for abts_done");
1252
1253         spin_lock_bh(&tgt->tgt_lock);
1254         io_req->wait_for_abts_comp = 0;
1255         if (test_bit(BNX2FC_FLAG_IO_COMPL, &io_req->req_flags)) {
1256                 BNX2FC_IO_DBG(io_req, "IO completed in a different context\n");
1257                 rc = SUCCESS;
1258         } else if (!(test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
1259                                       &io_req->req_flags))) {
1260                 /* Let the scsi-ml try to recover this command */
1261                 printk(KERN_ERR PFX "abort failed, xid = 0x%x\n",
1262                        io_req->xid);
1263                 /*
1264                  * Cleanup firmware residuals before returning control back
1265                  * to SCSI ML.
1266                  */
1267                 rc = bnx2fc_abts_cleanup(io_req);
1268                 goto done;
1269         } else {
1270                 /*
1271                  * We come here even when there was a race condition
1272                  * between timeout and abts completion, and abts
1273                  * completion happens just in time.
1274                  */
1275                 BNX2FC_IO_DBG(io_req, "abort succeeded\n");
1276                 rc = SUCCESS;
1277                 bnx2fc_scsi_done(io_req, DID_ABORT);
1278                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1279         }
1280 done:
1281         /* release the reference taken in eh_abort */
1282         kref_put(&io_req->refcount, bnx2fc_cmd_release);
1283         spin_unlock_bh(&tgt->tgt_lock);
1284         return rc;
1285 }
1286
1287 void bnx2fc_process_seq_cleanup_compl(struct bnx2fc_cmd *seq_clnp_req,
1288                                       struct fcoe_task_ctx_entry *task,
1289                                       u8 rx_state)
1290 {
1291         struct bnx2fc_els_cb_arg *cb_arg = seq_clnp_req->cb_arg;
1292         struct bnx2fc_cmd *orig_io_req = cb_arg->aborted_io_req;
1293         u32 offset = cb_arg->offset;
1294         enum fc_rctl r_ctl = cb_arg->r_ctl;
1295         int rc = 0;
1296         struct bnx2fc_rport *tgt = orig_io_req->tgt;
1297
1298         BNX2FC_IO_DBG(orig_io_req, "Entered process_cleanup_compl xid = 0x%x"
1299                               "cmd_type = %d\n",
1300                    seq_clnp_req->xid, seq_clnp_req->cmd_type);
1301
1302         if (rx_state == FCOE_TASK_RX_STATE_IGNORED_SEQUENCE_CLEANUP) {
1303                 printk(KERN_ERR PFX "seq cleanup ignored - xid = 0x%x\n",
1304                         seq_clnp_req->xid);
1305                 goto free_cb_arg;
1306         }
1307
1308         spin_unlock_bh(&tgt->tgt_lock);
1309         rc = bnx2fc_send_srr(orig_io_req, offset, r_ctl);
1310         spin_lock_bh(&tgt->tgt_lock);
1311
1312         if (rc)
1313                 printk(KERN_ERR PFX "clnup_compl: Unable to send SRR"
1314                         " IO will abort\n");
1315         seq_clnp_req->cb_arg = NULL;
1316         kref_put(&orig_io_req->refcount, bnx2fc_cmd_release);
1317 free_cb_arg:
1318         kfree(cb_arg);
1319         return;
1320 }
1321
1322 void bnx2fc_process_cleanup_compl(struct bnx2fc_cmd *io_req,
1323                                   struct fcoe_task_ctx_entry *task,
1324                                   u8 num_rq)
1325 {
1326         BNX2FC_IO_DBG(io_req, "Entered process_cleanup_compl "
1327                               "refcnt = %d, cmd_type = %d\n",
1328                    kref_read(&io_req->refcount), io_req->cmd_type);
1329         /*
1330          * Test whether there is a cleanup request pending. If not just
1331          * exit.
1332          */
1333         if (!test_and_clear_bit(BNX2FC_FLAG_ISSUE_CLEANUP_REQ,
1334                                 &io_req->req_flags))
1335                 return;
1336         /*
1337          * If we receive a cleanup completion for this request then the
1338          * firmware will not give us an abort completion for this request
1339          * so clear any ABTS pending flags.
1340          */
1341         if (test_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags) &&
1342             !test_bit(BNX2FC_FLAG_ABTS_DONE, &io_req->req_flags)) {
1343                 set_bit(BNX2FC_FLAG_ABTS_DONE, &io_req->req_flags);
1344                 if (io_req->wait_for_abts_comp)
1345                         complete(&io_req->abts_done);
1346         }
1347
1348         bnx2fc_scsi_done(io_req, DID_ERROR);
1349         kref_put(&io_req->refcount, bnx2fc_cmd_release);
1350         if (io_req->wait_for_cleanup_comp)
1351                 complete(&io_req->cleanup_done);
1352 }
1353
1354 void bnx2fc_process_abts_compl(struct bnx2fc_cmd *io_req,
1355                                struct fcoe_task_ctx_entry *task,
1356                                u8 num_rq)
1357 {
1358         u32 r_ctl;
1359         u32 r_a_tov = FC_DEF_R_A_TOV;
1360         u8 issue_rrq = 0;
1361         struct bnx2fc_rport *tgt = io_req->tgt;
1362
1363         BNX2FC_IO_DBG(io_req, "Entered process_abts_compl xid = 0x%x"
1364                               "refcnt = %d, cmd_type = %d\n",
1365                    io_req->xid,
1366                    kref_read(&io_req->refcount), io_req->cmd_type);
1367
1368         if (test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
1369                                        &io_req->req_flags)) {
1370                 BNX2FC_IO_DBG(io_req, "Timer context finished processing"
1371                                 " this io\n");
1372                 return;
1373         }
1374
1375         /*
1376          * If we receive an ABTS completion here then we will not receive
1377          * a cleanup completion so clear any cleanup pending flags.
1378          */
1379         if (test_bit(BNX2FC_FLAG_ISSUE_CLEANUP_REQ, &io_req->req_flags)) {
1380                 clear_bit(BNX2FC_FLAG_ISSUE_CLEANUP_REQ, &io_req->req_flags);
1381                 if (io_req->wait_for_cleanup_comp)
1382                         complete(&io_req->cleanup_done);
1383         }
1384
1385         /* Do not issue RRQ as this IO is already cleanedup */
1386         if (test_and_set_bit(BNX2FC_FLAG_IO_CLEANUP,
1387                                 &io_req->req_flags))
1388                 goto io_compl;
1389
1390         /*
1391          * For ABTS issued due to SCSI eh_abort_handler, timeout
1392          * values are maintained by scsi-ml itself. Cancel timeout
1393          * in case ABTS issued as part of task management function
1394          * or due to FW error.
1395          */
1396         if (test_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags))
1397                 if (cancel_delayed_work(&io_req->timeout_work))
1398                         kref_put(&io_req->refcount,
1399                                  bnx2fc_cmd_release); /* drop timer hold */
1400
1401         r_ctl = (u8)task->rxwr_only.union_ctx.comp_info.abts_rsp.r_ctl;
1402
1403         switch (r_ctl) {
1404         case FC_RCTL_BA_ACC:
1405                 /*
1406                  * Dont release this cmd yet. It will be relesed
1407                  * after we get RRQ response
1408                  */
1409                 BNX2FC_IO_DBG(io_req, "ABTS response - ACC Send RRQ\n");
1410                 issue_rrq = 1;
1411                 break;
1412
1413         case FC_RCTL_BA_RJT:
1414                 BNX2FC_IO_DBG(io_req, "ABTS response - RJT\n");
1415                 break;
1416         default:
1417                 printk(KERN_ERR PFX "Unknown ABTS response\n");
1418                 break;
1419         }
1420
1421         if (issue_rrq) {
1422                 BNX2FC_IO_DBG(io_req, "Issue RRQ after R_A_TOV\n");
1423                 set_bit(BNX2FC_FLAG_ISSUE_RRQ, &io_req->req_flags);
1424         }
1425         set_bit(BNX2FC_FLAG_RETIRE_OXID, &io_req->req_flags);
1426         bnx2fc_cmd_timer_set(io_req, r_a_tov);
1427
1428 io_compl:
1429         if (io_req->wait_for_abts_comp) {
1430                 if (test_and_clear_bit(BNX2FC_FLAG_EH_ABORT,
1431                                        &io_req->req_flags))
1432                         complete(&io_req->abts_done);
1433         } else {
1434                 /*
1435                  * We end up here when ABTS is issued as
1436                  * in asynchronous context, i.e., as part
1437                  * of task management completion, or
1438                  * when FW error is received or when the
1439                  * ABTS is issued when the IO is timed
1440                  * out.
1441                  */
1442
1443                 if (io_req->on_active_queue) {
1444                         list_del_init(&io_req->link);
1445                         io_req->on_active_queue = 0;
1446                         /* Move IO req to retire queue */
1447                         list_add_tail(&io_req->link, &tgt->io_retire_queue);
1448                 }
1449                 bnx2fc_scsi_done(io_req, DID_ERROR);
1450                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1451         }
1452 }
1453
1454 static void bnx2fc_lun_reset_cmpl(struct bnx2fc_cmd *io_req)
1455 {
1456         struct bnx2fc_rport *tgt = io_req->tgt;
1457         struct bnx2fc_cmd *cmd, *tmp;
1458         struct bnx2fc_mp_req *tm_req = &io_req->mp_req;
1459         u64 lun;
1460         int rc = 0;
1461
1462         /* called with tgt_lock held */
1463         BNX2FC_IO_DBG(io_req, "Entered bnx2fc_lun_reset_cmpl\n");
1464         /*
1465          * Walk thru the active_ios queue and ABORT the IO
1466          * that matches with the LUN that was reset
1467          */
1468         list_for_each_entry_safe(cmd, tmp, &tgt->active_cmd_queue, link) {
1469                 BNX2FC_TGT_DBG(tgt, "LUN RST cmpl: scan for pending IOs\n");
1470                 if (!cmd->sc_cmd)
1471                         continue;
1472                 lun = cmd->sc_cmd->device->lun;
1473                 if (lun == tm_req->tm_lun) {
1474                         /* Initiate ABTS on this cmd */
1475                         if (!test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS,
1476                                               &cmd->req_flags)) {
1477                                 /* cancel the IO timeout */
1478                                 if (cancel_delayed_work(&io_req->timeout_work))
1479                                         kref_put(&io_req->refcount,
1480                                                  bnx2fc_cmd_release);
1481                                                         /* timer hold */
1482                                 rc = bnx2fc_initiate_abts(cmd);
1483                                 /* abts shouldn't fail in this context */
1484                                 WARN_ON(rc != SUCCESS);
1485                         } else
1486                                 printk(KERN_ERR PFX "lun_rst: abts already in"
1487                                         " progress for this IO 0x%x\n",
1488                                         cmd->xid);
1489                 }
1490         }
1491 }
1492
1493 static void bnx2fc_tgt_reset_cmpl(struct bnx2fc_cmd *io_req)
1494 {
1495         struct bnx2fc_rport *tgt = io_req->tgt;
1496         struct bnx2fc_cmd *cmd, *tmp;
1497         int rc = 0;
1498
1499         /* called with tgt_lock held */
1500         BNX2FC_IO_DBG(io_req, "Entered bnx2fc_tgt_reset_cmpl\n");
1501         /*
1502          * Walk thru the active_ios queue and ABORT the IO
1503          * that matches with the LUN that was reset
1504          */
1505         list_for_each_entry_safe(cmd, tmp, &tgt->active_cmd_queue, link) {
1506                 BNX2FC_TGT_DBG(tgt, "TGT RST cmpl: scan for pending IOs\n");
1507                 /* Initiate ABTS */
1508                 if (!test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS,
1509                                                         &cmd->req_flags)) {
1510                         /* cancel the IO timeout */
1511                         if (cancel_delayed_work(&io_req->timeout_work))
1512                                 kref_put(&io_req->refcount,
1513                                          bnx2fc_cmd_release); /* timer hold */
1514                         rc = bnx2fc_initiate_abts(cmd);
1515                         /* abts shouldn't fail in this context */
1516                         WARN_ON(rc != SUCCESS);
1517
1518                 } else
1519                         printk(KERN_ERR PFX "tgt_rst: abts already in progress"
1520                                 " for this IO 0x%x\n", cmd->xid);
1521         }
1522 }
1523
1524 void bnx2fc_process_tm_compl(struct bnx2fc_cmd *io_req,
1525                              struct fcoe_task_ctx_entry *task, u8 num_rq,
1526                                   unsigned char *rq_data)
1527 {
1528         struct bnx2fc_mp_req *tm_req;
1529         struct fc_frame_header *fc_hdr;
1530         struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1531         u64 *hdr;
1532         u64 *temp_hdr;
1533         void *rsp_buf;
1534
1535         /* Called with tgt_lock held */
1536         BNX2FC_IO_DBG(io_req, "Entered process_tm_compl\n");
1537
1538         if (!(test_bit(BNX2FC_FLAG_TM_TIMEOUT, &io_req->req_flags)))
1539                 set_bit(BNX2FC_FLAG_TM_COMPL, &io_req->req_flags);
1540         else {
1541                 /* TM has already timed out and we got
1542                  * delayed completion. Ignore completion
1543                  * processing.
1544                  */
1545                 return;
1546         }
1547
1548         tm_req = &(io_req->mp_req);
1549         fc_hdr = &(tm_req->resp_fc_hdr);
1550         hdr = (u64 *)fc_hdr;
1551         temp_hdr = (u64 *)
1552                 &task->rxwr_only.union_ctx.comp_info.mp_rsp.fc_hdr;
1553         hdr[0] = cpu_to_be64(temp_hdr[0]);
1554         hdr[1] = cpu_to_be64(temp_hdr[1]);
1555         hdr[2] = cpu_to_be64(temp_hdr[2]);
1556
1557         tm_req->resp_len =
1558                 task->rxwr_only.union_ctx.comp_info.mp_rsp.mp_payload_len;
1559
1560         rsp_buf = tm_req->resp_buf;
1561
1562         if (fc_hdr->fh_r_ctl == FC_RCTL_DD_CMD_STATUS) {
1563                 bnx2fc_parse_fcp_rsp(io_req,
1564                                      (struct fcoe_fcp_rsp_payload *)
1565                                      rsp_buf, num_rq, rq_data);
1566                 if (io_req->fcp_rsp_code == 0) {
1567                         /* TM successful */
1568                         if (tm_req->tm_flags & FCP_TMF_LUN_RESET)
1569                                 bnx2fc_lun_reset_cmpl(io_req);
1570                         else if (tm_req->tm_flags & FCP_TMF_TGT_RESET)
1571                                 bnx2fc_tgt_reset_cmpl(io_req);
1572                 }
1573         } else {
1574                 printk(KERN_ERR PFX "tmf's fc_hdr r_ctl = 0x%x\n",
1575                         fc_hdr->fh_r_ctl);
1576         }
1577         if (sc_cmd) {
1578                 if (!bnx2fc_priv(sc_cmd)->io_req) {
1579                         printk(KERN_ERR PFX "tm_compl: io_req is NULL\n");
1580                         return;
1581                 }
1582                 switch (io_req->fcp_status) {
1583                 case FC_GOOD:
1584                         if (io_req->cdb_status == 0) {
1585                                 /* Good IO completion */
1586                                 sc_cmd->result = DID_OK << 16;
1587                         } else {
1588                                 /* Transport status is good, SCSI status not good */
1589                                 sc_cmd->result = (DID_OK << 16) | io_req->cdb_status;
1590                         }
1591                         if (io_req->fcp_resid)
1592                                 scsi_set_resid(sc_cmd, io_req->fcp_resid);
1593                         break;
1594
1595                 default:
1596                         BNX2FC_IO_DBG(io_req, "process_tm_compl: fcp_status = %d\n",
1597                                       io_req->fcp_status);
1598                         break;
1599                 }
1600
1601                 sc_cmd = io_req->sc_cmd;
1602                 io_req->sc_cmd = NULL;
1603
1604                 bnx2fc_priv(sc_cmd)->io_req = NULL;
1605                 scsi_done(sc_cmd);
1606         }
1607
1608         /* check if the io_req exists in tgt's tmf_q */
1609         if (io_req->on_tmf_queue) {
1610
1611                 list_del_init(&io_req->link);
1612                 io_req->on_tmf_queue = 0;
1613         } else {
1614
1615                 printk(KERN_ERR PFX "Command not on active_cmd_queue!\n");
1616                 return;
1617         }
1618
1619         kref_put(&io_req->refcount, bnx2fc_cmd_release);
1620         if (io_req->wait_for_abts_comp) {
1621                 BNX2FC_IO_DBG(io_req, "tm_compl - wake up the waiter\n");
1622                 complete(&io_req->abts_done);
1623         }
1624 }
1625
1626 static int bnx2fc_split_bd(struct bnx2fc_cmd *io_req, u64 addr, int sg_len,
1627                            int bd_index)
1628 {
1629         struct fcoe_bd_ctx *bd = io_req->bd_tbl->bd_tbl;
1630         int frag_size, sg_frags;
1631
1632         sg_frags = 0;
1633         while (sg_len) {
1634                 if (sg_len >= BNX2FC_BD_SPLIT_SZ)
1635                         frag_size = BNX2FC_BD_SPLIT_SZ;
1636                 else
1637                         frag_size = sg_len;
1638                 bd[bd_index + sg_frags].buf_addr_lo = addr & 0xffffffff;
1639                 bd[bd_index + sg_frags].buf_addr_hi  = addr >> 32;
1640                 bd[bd_index + sg_frags].buf_len = (u16)frag_size;
1641                 bd[bd_index + sg_frags].flags = 0;
1642
1643                 addr += (u64) frag_size;
1644                 sg_frags++;
1645                 sg_len -= frag_size;
1646         }
1647         return sg_frags;
1648
1649 }
1650
1651 static int bnx2fc_map_sg(struct bnx2fc_cmd *io_req)
1652 {
1653         struct bnx2fc_interface *interface = io_req->port->priv;
1654         struct bnx2fc_hba *hba = interface->hba;
1655         struct scsi_cmnd *sc = io_req->sc_cmd;
1656         struct fcoe_bd_ctx *bd = io_req->bd_tbl->bd_tbl;
1657         struct scatterlist *sg;
1658         int byte_count = 0;
1659         int sg_count = 0;
1660         int bd_count = 0;
1661         int sg_frags;
1662         unsigned int sg_len;
1663         u64 addr;
1664         int i;
1665
1666         WARN_ON(scsi_sg_count(sc) > BNX2FC_MAX_BDS_PER_CMD);
1667         /*
1668          * Use dma_map_sg directly to ensure we're using the correct
1669          * dev struct off of pcidev.
1670          */
1671         sg_count = dma_map_sg(&hba->pcidev->dev, scsi_sglist(sc),
1672                               scsi_sg_count(sc), sc->sc_data_direction);
1673         scsi_for_each_sg(sc, sg, sg_count, i) {
1674                 sg_len = sg_dma_len(sg);
1675                 addr = sg_dma_address(sg);
1676                 if (sg_len > BNX2FC_MAX_BD_LEN) {
1677                         sg_frags = bnx2fc_split_bd(io_req, addr, sg_len,
1678                                                    bd_count);
1679                 } else {
1680
1681                         sg_frags = 1;
1682                         bd[bd_count].buf_addr_lo = addr & 0xffffffff;
1683                         bd[bd_count].buf_addr_hi  = addr >> 32;
1684                         bd[bd_count].buf_len = (u16)sg_len;
1685                         bd[bd_count].flags = 0;
1686                 }
1687                 bd_count += sg_frags;
1688                 byte_count += sg_len;
1689         }
1690         if (byte_count != scsi_bufflen(sc))
1691                 printk(KERN_ERR PFX "byte_count = %d != scsi_bufflen = %d, "
1692                         "task_id = 0x%x\n", byte_count, scsi_bufflen(sc),
1693                         io_req->xid);
1694         return bd_count;
1695 }
1696
1697 static int bnx2fc_build_bd_list_from_sg(struct bnx2fc_cmd *io_req)
1698 {
1699         struct scsi_cmnd *sc = io_req->sc_cmd;
1700         struct fcoe_bd_ctx *bd = io_req->bd_tbl->bd_tbl;
1701         int bd_count;
1702
1703         if (scsi_sg_count(sc)) {
1704                 bd_count = bnx2fc_map_sg(io_req);
1705                 if (bd_count == 0)
1706                         return -ENOMEM;
1707         } else {
1708                 bd_count = 0;
1709                 bd[0].buf_addr_lo = bd[0].buf_addr_hi = 0;
1710                 bd[0].buf_len = bd[0].flags = 0;
1711         }
1712         io_req->bd_tbl->bd_valid = bd_count;
1713
1714         /*
1715          * Return the command to ML if BD count exceeds the max number
1716          * that can be handled by FW.
1717          */
1718         if (bd_count > BNX2FC_FW_MAX_BDS_PER_CMD) {
1719                 pr_err("bd_count = %d exceeded FW supported max BD(255), task_id = 0x%x\n",
1720                        bd_count, io_req->xid);
1721                 return -ENOMEM;
1722         }
1723
1724         return 0;
1725 }
1726
1727 static void bnx2fc_unmap_sg_list(struct bnx2fc_cmd *io_req)
1728 {
1729         struct scsi_cmnd *sc = io_req->sc_cmd;
1730         struct bnx2fc_interface *interface = io_req->port->priv;
1731         struct bnx2fc_hba *hba = interface->hba;
1732
1733         /*
1734          * Use dma_unmap_sg directly to ensure we're using the correct
1735          * dev struct off of pcidev.
1736          */
1737         if (io_req->bd_tbl->bd_valid && sc && scsi_sg_count(sc)) {
1738                 dma_unmap_sg(&hba->pcidev->dev, scsi_sglist(sc),
1739                     scsi_sg_count(sc), sc->sc_data_direction);
1740                 io_req->bd_tbl->bd_valid = 0;
1741         }
1742 }
1743
1744 void bnx2fc_build_fcp_cmnd(struct bnx2fc_cmd *io_req,
1745                                   struct fcp_cmnd *fcp_cmnd)
1746 {
1747         memset(fcp_cmnd, 0, sizeof(struct fcp_cmnd));
1748
1749         fcp_cmnd->fc_dl = htonl(io_req->data_xfer_len);
1750         fcp_cmnd->fc_cmdref = 0;
1751         fcp_cmnd->fc_pri_ta = 0;
1752         fcp_cmnd->fc_tm_flags = io_req->mp_req.tm_flags;
1753         fcp_cmnd->fc_flags = io_req->io_req_flags;
1754         fcp_cmnd->fc_pri_ta = FCP_PTA_SIMPLE;
1755 }
1756
1757 static void bnx2fc_parse_fcp_rsp(struct bnx2fc_cmd *io_req,
1758                                  struct fcoe_fcp_rsp_payload *fcp_rsp,
1759                                  u8 num_rq, unsigned char *rq_data)
1760 {
1761         struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1762         u8 rsp_flags = fcp_rsp->fcp_flags.flags;
1763         u32 rq_buff_len = 0;
1764         int fcp_sns_len = 0;
1765         int fcp_rsp_len = 0;
1766
1767         io_req->fcp_status = FC_GOOD;
1768         io_req->fcp_resid = 0;
1769         if (rsp_flags & (FCOE_FCP_RSP_FLAGS_FCP_RESID_OVER |
1770             FCOE_FCP_RSP_FLAGS_FCP_RESID_UNDER))
1771                 io_req->fcp_resid = fcp_rsp->fcp_resid;
1772
1773         io_req->scsi_comp_flags = rsp_flags;
1774         io_req->cdb_status = fcp_rsp->scsi_status_code;
1775
1776         /* Fetch fcp_rsp_info and fcp_sns_info if available */
1777         if (num_rq) {
1778
1779                 /*
1780                  * We do not anticipate num_rq >1, as the linux defined
1781                  * SCSI_SENSE_BUFFERSIZE is 96 bytes + 8 bytes of FCP_RSP_INFO
1782                  * 256 bytes of single rq buffer is good enough to hold this.
1783                  */
1784
1785                 if (rsp_flags &
1786                     FCOE_FCP_RSP_FLAGS_FCP_RSP_LEN_VALID) {
1787                         fcp_rsp_len = rq_buff_len
1788                                         = fcp_rsp->fcp_rsp_len;
1789                 }
1790
1791                 if (rsp_flags &
1792                     FCOE_FCP_RSP_FLAGS_FCP_SNS_LEN_VALID) {
1793                         fcp_sns_len = fcp_rsp->fcp_sns_len;
1794                         rq_buff_len += fcp_rsp->fcp_sns_len;
1795                 }
1796
1797                 io_req->fcp_rsp_len = fcp_rsp_len;
1798                 io_req->fcp_sns_len = fcp_sns_len;
1799
1800                 if (rq_buff_len > num_rq * BNX2FC_RQ_BUF_SZ) {
1801                         /* Invalid sense sense length. */
1802                         printk(KERN_ERR PFX "invalid sns length %d\n",
1803                                 rq_buff_len);
1804                         /* reset rq_buff_len */
1805                         rq_buff_len =  num_rq * BNX2FC_RQ_BUF_SZ;
1806                 }
1807
1808                 /* fetch fcp_rsp_code */
1809                 if ((fcp_rsp_len == 4) || (fcp_rsp_len == 8)) {
1810                         /* Only for task management function */
1811                         io_req->fcp_rsp_code = rq_data[3];
1812                         BNX2FC_IO_DBG(io_req, "fcp_rsp_code = %d\n",
1813                                 io_req->fcp_rsp_code);
1814                 }
1815
1816                 /* fetch sense data */
1817                 rq_data += fcp_rsp_len;
1818
1819                 if (fcp_sns_len > SCSI_SENSE_BUFFERSIZE) {
1820                         printk(KERN_ERR PFX "Truncating sense buffer\n");
1821                         fcp_sns_len = SCSI_SENSE_BUFFERSIZE;
1822                 }
1823
1824                 memset(sc_cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1825                 if (fcp_sns_len)
1826                         memcpy(sc_cmd->sense_buffer, rq_data, fcp_sns_len);
1827
1828         }
1829 }
1830
1831 /**
1832  * bnx2fc_queuecommand - Queuecommand function of the scsi template
1833  *
1834  * @host:       The Scsi_Host the command was issued to
1835  * @sc_cmd:     struct scsi_cmnd to be executed
1836  *
1837  * This is the IO strategy routine, called by SCSI-ML
1838  **/
1839 int bnx2fc_queuecommand(struct Scsi_Host *host,
1840                         struct scsi_cmnd *sc_cmd)
1841 {
1842         struct fc_lport *lport = shost_priv(host);
1843         struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
1844         struct fc_rport_libfc_priv *rp = rport->dd_data;
1845         struct bnx2fc_rport *tgt;
1846         struct bnx2fc_cmd *io_req;
1847         int rc = 0;
1848         int rval;
1849
1850         rval = fc_remote_port_chkready(rport);
1851         if (rval) {
1852                 sc_cmd->result = rval;
1853                 scsi_done(sc_cmd);
1854                 return 0;
1855         }
1856
1857         if ((lport->state != LPORT_ST_READY) || !(lport->link_up)) {
1858                 rc = SCSI_MLQUEUE_HOST_BUSY;
1859                 goto exit_qcmd;
1860         }
1861
1862         /* rport and tgt are allocated together, so tgt should be non-NULL */
1863         tgt = (struct bnx2fc_rport *)&rp[1];
1864
1865         if (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags)) {
1866                 /*
1867                  * Session is not offloaded yet. Let SCSI-ml retry
1868                  * the command.
1869                  */
1870                 rc = SCSI_MLQUEUE_TARGET_BUSY;
1871                 goto exit_qcmd;
1872         }
1873         if (tgt->retry_delay_timestamp) {
1874                 if (time_after(jiffies, tgt->retry_delay_timestamp)) {
1875                         tgt->retry_delay_timestamp = 0;
1876                 } else {
1877                         /* If retry_delay timer is active, flow off the ML */
1878                         rc = SCSI_MLQUEUE_TARGET_BUSY;
1879                         goto exit_qcmd;
1880                 }
1881         }
1882
1883         spin_lock_bh(&tgt->tgt_lock);
1884
1885         io_req = bnx2fc_cmd_alloc(tgt);
1886         if (!io_req) {
1887                 rc = SCSI_MLQUEUE_HOST_BUSY;
1888                 goto exit_qcmd_tgtlock;
1889         }
1890         io_req->sc_cmd = sc_cmd;
1891
1892         if (bnx2fc_post_io_req(tgt, io_req)) {
1893                 printk(KERN_ERR PFX "Unable to post io_req\n");
1894                 rc = SCSI_MLQUEUE_HOST_BUSY;
1895                 goto exit_qcmd_tgtlock;
1896         }
1897
1898 exit_qcmd_tgtlock:
1899         spin_unlock_bh(&tgt->tgt_lock);
1900 exit_qcmd:
1901         return rc;
1902 }
1903
1904 void bnx2fc_process_scsi_cmd_compl(struct bnx2fc_cmd *io_req,
1905                                    struct fcoe_task_ctx_entry *task,
1906                                    u8 num_rq, unsigned char *rq_data)
1907 {
1908         struct fcoe_fcp_rsp_payload *fcp_rsp;
1909         struct bnx2fc_rport *tgt = io_req->tgt;
1910         struct scsi_cmnd *sc_cmd;
1911         u16 scope = 0, qualifier = 0;
1912
1913         /* scsi_cmd_cmpl is called with tgt lock held */
1914
1915         if (test_and_set_bit(BNX2FC_FLAG_IO_COMPL, &io_req->req_flags)) {
1916                 /* we will not receive ABTS response for this IO */
1917                 BNX2FC_IO_DBG(io_req, "Timer context finished processing "
1918                            "this scsi cmd\n");
1919                 if (test_and_clear_bit(BNX2FC_FLAG_IO_CLEANUP,
1920                                        &io_req->req_flags)) {
1921                         BNX2FC_IO_DBG(io_req,
1922                                       "Actual completion after cleanup request cleaning up\n");
1923                         bnx2fc_process_cleanup_compl(io_req, task, num_rq);
1924                 }
1925                 return;
1926         }
1927
1928         /* Cancel the timeout_work, as we received IO completion */
1929         if (cancel_delayed_work(&io_req->timeout_work))
1930                 kref_put(&io_req->refcount,
1931                          bnx2fc_cmd_release); /* drop timer hold */
1932
1933         sc_cmd = io_req->sc_cmd;
1934         if (sc_cmd == NULL) {
1935                 printk(KERN_ERR PFX "scsi_cmd_compl - sc_cmd is NULL\n");
1936                 return;
1937         }
1938
1939         /* Fetch fcp_rsp from task context and perform cmd completion */
1940         fcp_rsp = (struct fcoe_fcp_rsp_payload *)
1941                    &(task->rxwr_only.union_ctx.comp_info.fcp_rsp.payload);
1942
1943         /* parse fcp_rsp and obtain sense data from RQ if available */
1944         bnx2fc_parse_fcp_rsp(io_req, fcp_rsp, num_rq, rq_data);
1945
1946         if (!bnx2fc_priv(sc_cmd)->io_req) {
1947                 printk(KERN_ERR PFX "io_req is NULL\n");
1948                 return;
1949         }
1950
1951         if (io_req->on_active_queue) {
1952                 list_del_init(&io_req->link);
1953                 io_req->on_active_queue = 0;
1954                 /* Move IO req to retire queue */
1955                 list_add_tail(&io_req->link, &tgt->io_retire_queue);
1956         } else {
1957                 /* This should not happen, but could have been pulled
1958                  * by bnx2fc_flush_active_ios(), or during a race
1959                  * between command abort and (late) completion.
1960                  */
1961                 BNX2FC_IO_DBG(io_req, "xid not on active_cmd_queue\n");
1962                 if (io_req->wait_for_abts_comp)
1963                         if (test_and_clear_bit(BNX2FC_FLAG_EH_ABORT,
1964                                                &io_req->req_flags))
1965                                 complete(&io_req->abts_done);
1966         }
1967
1968         bnx2fc_unmap_sg_list(io_req);
1969         io_req->sc_cmd = NULL;
1970
1971         switch (io_req->fcp_status) {
1972         case FC_GOOD:
1973                 if (io_req->cdb_status == 0) {
1974                         /* Good IO completion */
1975                         sc_cmd->result = DID_OK << 16;
1976                 } else {
1977                         /* Transport status is good, SCSI status not good */
1978                         BNX2FC_IO_DBG(io_req, "scsi_cmpl: cdb_status = %d"
1979                                  " fcp_resid = 0x%x\n",
1980                                 io_req->cdb_status, io_req->fcp_resid);
1981                         sc_cmd->result = (DID_OK << 16) | io_req->cdb_status;
1982
1983                         if (io_req->cdb_status == SAM_STAT_TASK_SET_FULL ||
1984                             io_req->cdb_status == SAM_STAT_BUSY) {
1985                                 /* Newer array firmware with BUSY or
1986                                  * TASK_SET_FULL may return a status that needs
1987                                  * the scope bits masked.
1988                                  * Or a huge delay timestamp up to 27 minutes
1989                                  * can result.
1990                                  */
1991                                 if (fcp_rsp->retry_delay_timer) {
1992                                         /* Upper 2 bits */
1993                                         scope = fcp_rsp->retry_delay_timer
1994                                                 & 0xC000;
1995                                         /* Lower 14 bits */
1996                                         qualifier = fcp_rsp->retry_delay_timer
1997                                                 & 0x3FFF;
1998                                 }
1999                                 if (scope > 0 && qualifier > 0 &&
2000                                         qualifier <= 0x3FEF) {
2001                                         /* Set the jiffies +
2002                                          * retry_delay_timer * 100ms
2003                                          * for the rport/tgt
2004                                          */
2005                                         tgt->retry_delay_timestamp = jiffies +
2006                                                 (qualifier * HZ / 10);
2007                                 }
2008                         }
2009                 }
2010                 if (io_req->fcp_resid)
2011                         scsi_set_resid(sc_cmd, io_req->fcp_resid);
2012                 break;
2013         default:
2014                 printk(KERN_ERR PFX "scsi_cmd_compl: fcp_status = %d\n",
2015                         io_req->fcp_status);
2016                 break;
2017         }
2018         bnx2fc_priv(sc_cmd)->io_req = NULL;
2019         scsi_done(sc_cmd);
2020         kref_put(&io_req->refcount, bnx2fc_cmd_release);
2021 }
2022
2023 int bnx2fc_post_io_req(struct bnx2fc_rport *tgt,
2024                                struct bnx2fc_cmd *io_req)
2025 {
2026         struct fcoe_task_ctx_entry *task;
2027         struct fcoe_task_ctx_entry *task_page;
2028         struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
2029         struct fcoe_port *port = tgt->port;
2030         struct bnx2fc_interface *interface = port->priv;
2031         struct bnx2fc_hba *hba = interface->hba;
2032         struct fc_lport *lport = port->lport;
2033         int task_idx, index;
2034         u16 xid;
2035
2036         /* bnx2fc_post_io_req() is called with the tgt_lock held */
2037
2038         /* Initialize rest of io_req fields */
2039         io_req->cmd_type = BNX2FC_SCSI_CMD;
2040         io_req->port = port;
2041         io_req->tgt = tgt;
2042         io_req->data_xfer_len = scsi_bufflen(sc_cmd);
2043         bnx2fc_priv(sc_cmd)->io_req = io_req;
2044
2045         if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE) {
2046                 io_req->io_req_flags = BNX2FC_READ;
2047                 this_cpu_inc(lport->stats->InputRequests);
2048                 this_cpu_add(lport->stats->InputBytes, io_req->data_xfer_len);
2049         } else if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) {
2050                 io_req->io_req_flags = BNX2FC_WRITE;
2051                 this_cpu_inc(lport->stats->OutputRequests);
2052                 this_cpu_add(lport->stats->OutputBytes, io_req->data_xfer_len);
2053         } else {
2054                 io_req->io_req_flags = 0;
2055                 this_cpu_inc(lport->stats->ControlRequests);
2056         }
2057
2058         xid = io_req->xid;
2059
2060         /* Build buffer descriptor list for firmware from sg list */
2061         if (bnx2fc_build_bd_list_from_sg(io_req)) {
2062                 printk(KERN_ERR PFX "BD list creation failed\n");
2063                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
2064                 return -EAGAIN;
2065         }
2066
2067         task_idx = xid / BNX2FC_TASKS_PER_PAGE;
2068         index = xid % BNX2FC_TASKS_PER_PAGE;
2069
2070         /* Initialize task context for this IO request */
2071         task_page = (struct fcoe_task_ctx_entry *) hba->task_ctx[task_idx];
2072         task = &(task_page[index]);
2073         bnx2fc_init_task(io_req, task);
2074
2075         if (tgt->flush_in_prog) {
2076                 printk(KERN_ERR PFX "Flush in progress..Host Busy\n");
2077                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
2078                 return -EAGAIN;
2079         }
2080
2081         if (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags)) {
2082                 printk(KERN_ERR PFX "Session not ready...post_io\n");
2083                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
2084                 return -EAGAIN;
2085         }
2086
2087         /* Time IO req */
2088         if (tgt->io_timeout)
2089                 bnx2fc_cmd_timer_set(io_req, BNX2FC_IO_TIMEOUT);
2090         /* Obtain free SQ entry */
2091         bnx2fc_add_2_sq(tgt, xid);
2092
2093         /* Enqueue the io_req to active_cmd_queue */
2094
2095         io_req->on_active_queue = 1;
2096         /* move io_req from pending_queue to active_queue */
2097         list_add_tail(&io_req->link, &tgt->active_cmd_queue);
2098
2099         /* Ring doorbell */
2100         bnx2fc_ring_doorbell(tgt);
2101         return 0;
2102 }