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