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_resp_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;
 689         struct fc_rport_libfc_priv *rp;
 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         rport = starget_to_rport(scsi_target(sc_cmd->device));
 708         port = lport_priv(lport);
 709         interface = port->priv;
 710
 711         if (rport == NULL) {
 712                 printk(KERN_ERR PFX "device_reset: rport is NULL\n");
 713                 rc = FAILED;
 714                 goto tmf_err;
 715         }
 716         rp = rport->dd_data;
 717
 718         rc = fc_block_scsi_eh(sc_cmd);
 719         if (rc)
 720                 return rc;
 721
 722         if (lport->state != LPORT_ST_READY || !(lport->link_up)) {
 723                 printk(KERN_ERR PFX "device_reset: link is not ready\n");
 724                 rc = FAILED;
 725                 goto tmf_err;
 726         }
 727         /* rport and tgt are allocated together, so tgt should be non-NULL */
 728         tgt = (struct bnx2fc_rport *)&rp[1];
 729
 730         if (!(test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags))) {
 731                 printk(KERN_ERR PFX "device_reset: tgt not offloaded\n");
 732                 rc = FAILED;
 733                 goto tmf_err;
 734         }
 735 retry_tmf:
 736         io_req = bnx2fc_elstm_alloc(tgt, BNX2FC_TASK_MGMT_CMD);
 737         if (!io_req) {
 738                 if (time_after(jiffies, start + HZ)) {
 739                         printk(KERN_ERR PFX "tmf: Failed TMF");
 740                         rc = FAILED;
 741                         goto tmf_err;
 742                 }
 743                 msleep(20);
 744                 goto retry_tmf;
 745         }
 746         /* Initialize rest of io_req fields */
 747         io_req->sc_cmd = sc_cmd;
 748         io_req->port = port;
 749         io_req->tgt = tgt;
 750
 751         tm_req = (struct bnx2fc_mp_req *)&(io_req->mp_req);
 752
 753         rc = bnx2fc_init_mp_req(io_req);
 754         if (rc == FAILED) {
 755                 printk(KERN_ERR PFX "Task mgmt MP request init failed\n");
 756                 spin_lock_bh(&tgt->tgt_lock);
 757                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
 758                 spin_unlock_bh(&tgt->tgt_lock);
 759                 goto tmf_err;
 760         }
 761
 762         /* Set TM flags */
 763         io_req->io_req_flags = 0;
 764         tm_req->tm_flags = tm_flags;
 765
 766         /* Fill FCP_CMND */
 767         bnx2fc_build_fcp_cmnd(io_req, (struct fcp_cmnd *)tm_req->req_buf);
 768         fcp_cmnd = (struct fcp_cmnd *)tm_req->req_buf;
 769         memset(fcp_cmnd->fc_cdb, 0,  sc_cmd->cmd_len);
 770         fcp_cmnd->fc_dl = 0;
 771
 772         /* Fill FC header */
 773         fc_hdr = &(tm_req->req_fc_hdr);
 774         sid = tgt->sid;
 775         did = rport->port_id;
 776         __fc_fill_fc_hdr(fc_hdr, FC_RCTL_DD_UNSOL_CMD, did, sid,
 777                            FC_TYPE_FCP, FC_FC_FIRST_SEQ | FC_FC_END_SEQ |
 778                            FC_FC_SEQ_INIT, 0);
 779         /* Obtain exchange id */
 780         xid = io_req->xid;
 781
 782         BNX2FC_TGT_DBG(tgt, "Initiate TMF - xid = 0x%x\n", xid);
 783         task_idx = xid/BNX2FC_TASKS_PER_PAGE;
 784         index = xid % BNX2FC_TASKS_PER_PAGE;
 785
 786         /* Initialize task context for this IO request */
 787         task_page = (struct fcoe_task_ctx_entry *)
 788                         interface->hba->task_ctx[task_idx];
 789         task = &(task_page[index]);
 790         bnx2fc_init_mp_task(io_req, task);
 791
 792         sc_cmd->SCp.ptr = (char *)io_req;
 793
 794         /* Obtain free SQ entry */
 795         spin_lock_bh(&tgt->tgt_lock);
 796         bnx2fc_add_2_sq(tgt, xid);
 797
 798         /* Enqueue the io_req to active_tm_queue */
 799         io_req->on_tmf_queue = 1;
 800         list_add_tail(&io_req->link, &tgt->active_tm_queue);
 801
 802         init_completion(&io_req->tm_done);
 803         io_req->wait_for_comp = 1;
 804
 805         /* Ring doorbell */
 806         bnx2fc_ring_doorbell(tgt);
 807         spin_unlock_bh(&tgt->tgt_lock);
 808
 809         rc = wait_for_completion_timeout(&io_req->tm_done,
 810                                          BNX2FC_TM_TIMEOUT * HZ);
 811         spin_lock_bh(&tgt->tgt_lock);
 812
 813         io_req->wait_for_comp = 0;
 814         if (!(test_bit(BNX2FC_FLAG_TM_COMPL, &io_req->req_flags))) {
 815                 set_bit(BNX2FC_FLAG_TM_TIMEOUT, &io_req->req_flags);
 816                 if (io_req->on_tmf_queue) {
 817                         list_del_init(&io_req->link);
 818                         io_req->on_tmf_queue = 0;
 819                 }
 820                 io_req->wait_for_comp = 1;
 821                 bnx2fc_initiate_cleanup(io_req);
 822                 spin_unlock_bh(&tgt->tgt_lock);
 823                 rc = wait_for_completion_timeout(&io_req->tm_done,
 824                                                  BNX2FC_FW_TIMEOUT);
 825                 spin_lock_bh(&tgt->tgt_lock);
 826                 io_req->wait_for_comp = 0;
 827                 if (!rc)
 828                         kref_put(&io_req->refcount, bnx2fc_cmd_release);
 829         }
 830
 831         spin_unlock_bh(&tgt->tgt_lock);
 832
 833         if (!rc) {
 834                 BNX2FC_TGT_DBG(tgt, "task mgmt command failed...\n");
 835                 rc = FAILED;
 836         } else {
 837                 BNX2FC_TGT_DBG(tgt, "task mgmt command success...\n");
 838                 rc = SUCCESS;
 839         }
 840 tmf_err:
 841         return rc;
 842 }
 843
 844 int bnx2fc_initiate_abts(struct bnx2fc_cmd *io_req)
 845 {
 846         struct fc_lport *lport;
 847         struct bnx2fc_rport *tgt = io_req->tgt;
 848         struct fc_rport *rport = tgt->rport;
 849         struct fc_rport_priv *rdata = tgt->rdata;
 850         struct bnx2fc_interface *interface;
 851         struct fcoe_port *port;
 852         struct bnx2fc_cmd *abts_io_req;
 853         struct fcoe_task_ctx_entry *task;
 854         struct fcoe_task_ctx_entry *task_page;
 855         struct fc_frame_header *fc_hdr;
 856         struct bnx2fc_mp_req *abts_req;
 857         int task_idx, index;
 858         u32 sid, did;
 859         u16 xid;
 860         int rc = SUCCESS;
 861         u32 r_a_tov = rdata->r_a_tov;
 862
 863         /* called with tgt_lock held */
 864         BNX2FC_IO_DBG(io_req, "Entered bnx2fc_initiate_abts\n");
 865
 866         port = io_req->port;
 867         interface = port->priv;
 868         lport = port->lport;
 869
 870         if (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags)) {
 871                 printk(KERN_ERR PFX "initiate_abts: tgt not offloaded\n");
 872                 rc = FAILED;
 873                 goto abts_err;
 874         }
 875
 876         if (rport == NULL) {
 877                 printk(KERN_ERR PFX "initiate_abts: rport is NULL\n");
 878                 rc = FAILED;
 879                 goto abts_err;
 880         }
 881
 882         if (lport->state != LPORT_ST_READY || !(lport->link_up)) {
 883                 printk(KERN_ERR PFX "initiate_abts: link is not ready\n");
 884                 rc = FAILED;
 885                 goto abts_err;
 886         }
 887
 888         abts_io_req = bnx2fc_elstm_alloc(tgt, BNX2FC_ABTS);
 889         if (!abts_io_req) {
 890                 printk(KERN_ERR PFX "abts: couldnt allocate cmd\n");
 891                 rc = FAILED;
 892                 goto abts_err;
 893         }
 894
 895         /* Initialize rest of io_req fields */
 896         abts_io_req->sc_cmd = NULL;
 897         abts_io_req->port = port;
 898         abts_io_req->tgt = tgt;
 899         abts_io_req->data_xfer_len = 0; /* No data transfer for ABTS */
 900
 901         abts_req = (struct bnx2fc_mp_req *)&(abts_io_req->mp_req);
 902         memset(abts_req, 0, sizeof(struct bnx2fc_mp_req));
 903
 904         /* Fill FC header */
 905         fc_hdr = &(abts_req->req_fc_hdr);
 906
 907         /* Obtain oxid and rxid for the original exchange to be aborted */
 908         fc_hdr->fh_ox_id = htons(io_req->xid);
 909         fc_hdr->fh_rx_id = htons(io_req->task->rxwr_txrd.var_ctx.rx_id);
 910
 911         sid = tgt->sid;
 912         did = rport->port_id;
 913
 914         __fc_fill_fc_hdr(fc_hdr, FC_RCTL_BA_ABTS, did, sid,
 915                            FC_TYPE_BLS, FC_FC_FIRST_SEQ | FC_FC_END_SEQ |
 916                            FC_FC_SEQ_INIT, 0);
 917
 918         xid = abts_io_req->xid;
 919         BNX2FC_IO_DBG(abts_io_req, "ABTS io_req\n");
 920         task_idx = xid/BNX2FC_TASKS_PER_PAGE;
 921         index = xid % BNX2FC_TASKS_PER_PAGE;
 922
 923         /* Initialize task context for this IO request */
 924         task_page = (struct fcoe_task_ctx_entry *)
 925                         interface->hba->task_ctx[task_idx];
 926         task = &(task_page[index]);
 927         bnx2fc_init_mp_task(abts_io_req, task);
 928
 929         /*
 930          * ABTS task is a temporary task that will be cleaned up
 931          * irrespective of ABTS response. We need to start the timer
 932          * for the original exchange, as the CQE is posted for the original
 933          * IO request.
 934          *
 935          * Timer for ABTS is started only when it is originated by a
 936          * TM request. For the ABTS issued as part of ULP timeout,
 937          * scsi-ml maintains the timers.
 938          */
 939
 940         /* if (test_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags))*/
 941         bnx2fc_cmd_timer_set(io_req, 2 * r_a_tov);
 942
 943         /* Obtain free SQ entry */
 944         bnx2fc_add_2_sq(tgt, xid);
 945
 946         /* Ring doorbell */
 947         bnx2fc_ring_doorbell(tgt);
 948
 949 abts_err:
 950         return rc;
 951 }
 952
 953 int bnx2fc_initiate_seq_cleanup(struct bnx2fc_cmd *orig_io_req, u32 offset,
 954                                 enum fc_rctl r_ctl)
 955 {
 956         struct fc_lport *lport;
 957         struct bnx2fc_rport *tgt = orig_io_req->tgt;
 958         struct bnx2fc_interface *interface;
 959         struct fcoe_port *port;
 960         struct bnx2fc_cmd *seq_clnp_req;
 961         struct fcoe_task_ctx_entry *task;
 962         struct fcoe_task_ctx_entry *task_page;
 963         struct bnx2fc_els_cb_arg *cb_arg = NULL;
 964         int task_idx, index;
 965         u16 xid;
 966         int rc = 0;
 967
 968         BNX2FC_IO_DBG(orig_io_req, "bnx2fc_initiate_seq_cleanup xid = 0x%x\n",
 969                    orig_io_req->xid);
 970         kref_get(&orig_io_req->refcount);
 971
 972         port = orig_io_req->port;
 973         interface = port->priv;
 974         lport = port->lport;
 975
 976         cb_arg = kzalloc(sizeof(struct bnx2fc_els_cb_arg), GFP_ATOMIC);
 977         if (!cb_arg) {
 978                 printk(KERN_ERR PFX "Unable to alloc cb_arg for seq clnup\n");
 979                 rc = -ENOMEM;
 980                 goto cleanup_err;
 981         }
 982
 983         seq_clnp_req = bnx2fc_elstm_alloc(tgt, BNX2FC_SEQ_CLEANUP);
 984         if (!seq_clnp_req) {
 985                 printk(KERN_ERR PFX "cleanup: couldnt allocate cmd\n");
 986                 rc = -ENOMEM;
 987                 kfree(cb_arg);
 988                 goto cleanup_err;
 989         }
 990         /* Initialize rest of io_req fields */
 991         seq_clnp_req->sc_cmd = NULL;
 992         seq_clnp_req->port = port;
 993         seq_clnp_req->tgt = tgt;
 994         seq_clnp_req->data_xfer_len = 0; /* No data transfer for cleanup */
 995
 996         xid = seq_clnp_req->xid;
 997
 998         task_idx = xid/BNX2FC_TASKS_PER_PAGE;
 999         index = xid % BNX2FC_TASKS_PER_PAGE;
1000
1001         /* Initialize task context for this IO request */
1002         task_page = (struct fcoe_task_ctx_entry *)
1003                      interface->hba->task_ctx[task_idx];
1004         task = &(task_page[index]);
1005         cb_arg->aborted_io_req = orig_io_req;
1006         cb_arg->io_req = seq_clnp_req;
1007         cb_arg->r_ctl = r_ctl;
1008         cb_arg->offset = offset;
1009         seq_clnp_req->cb_arg = cb_arg;
1010
1011         printk(KERN_ERR PFX "call init_seq_cleanup_task\n");
1012         bnx2fc_init_seq_cleanup_task(seq_clnp_req, task, orig_io_req, offset);
1013
1014         /* Obtain free SQ entry */
1015         bnx2fc_add_2_sq(tgt, xid);
1016
1017         /* Ring doorbell */
1018         bnx2fc_ring_doorbell(tgt);
1019 cleanup_err:
1020         return rc;
1021 }
1022
1023 int bnx2fc_initiate_cleanup(struct bnx2fc_cmd *io_req)
1024 {
1025         struct fc_lport *lport;
1026         struct bnx2fc_rport *tgt = io_req->tgt;
1027         struct bnx2fc_interface *interface;
1028         struct fcoe_port *port;
1029         struct bnx2fc_cmd *cleanup_io_req;
1030         struct fcoe_task_ctx_entry *task;
1031         struct fcoe_task_ctx_entry *task_page;
1032         int task_idx, index;
1033         u16 xid, orig_xid;
1034         int rc = 0;
1035
1036         /* ASSUMPTION: called with tgt_lock held */
1037         BNX2FC_IO_DBG(io_req, "Entered bnx2fc_initiate_cleanup\n");
1038
1039         port = io_req->port;
1040         interface = port->priv;
1041         lport = port->lport;
1042
1043         cleanup_io_req = bnx2fc_elstm_alloc(tgt, BNX2FC_CLEANUP);
1044         if (!cleanup_io_req) {
1045                 printk(KERN_ERR PFX "cleanup: couldnt allocate cmd\n");
1046                 rc = -1;
1047                 goto cleanup_err;
1048         }
1049
1050         /* Initialize rest of io_req fields */
1051         cleanup_io_req->sc_cmd = NULL;
1052         cleanup_io_req->port = port;
1053         cleanup_io_req->tgt = tgt;
1054         cleanup_io_req->data_xfer_len = 0; /* No data transfer for cleanup */
1055
1056         xid = cleanup_io_req->xid;
1057
1058         task_idx = xid/BNX2FC_TASKS_PER_PAGE;
1059         index = xid % BNX2FC_TASKS_PER_PAGE;
1060
1061         /* Initialize task context for this IO request */
1062         task_page = (struct fcoe_task_ctx_entry *)
1063                         interface->hba->task_ctx[task_idx];
1064         task = &(task_page[index]);
1065         orig_xid = io_req->xid;
1066
1067         BNX2FC_IO_DBG(io_req, "CLEANUP io_req xid = 0x%x\n", xid);
1068
1069         bnx2fc_init_cleanup_task(cleanup_io_req, task, orig_xid);
1070
1071         /* Obtain free SQ entry */
1072         bnx2fc_add_2_sq(tgt, xid);
1073
1074         /* Ring doorbell */
1075         bnx2fc_ring_doorbell(tgt);
1076
1077 cleanup_err:
1078         return rc;
1079 }
1080
1081 /**
1082  * bnx2fc_eh_target_reset: Reset a target
1083  *
1084  * @sc_cmd:     SCSI command
1085  *
1086  * Set from SCSI host template to send task mgmt command to the target
1087  *      and wait for the response
1088  */
1089 int bnx2fc_eh_target_reset(struct scsi_cmnd *sc_cmd)
1090 {
1091         return bnx2fc_initiate_tmf(sc_cmd, FCP_TMF_TGT_RESET);
1092 }
1093
1094 /**
1095  * bnx2fc_eh_device_reset - Reset a single LUN
1096  *
1097  * @sc_cmd:     SCSI command
1098  *
1099  * Set from SCSI host template to send task mgmt command to the target
1100  *      and wait for the response
1101  */
1102 int bnx2fc_eh_device_reset(struct scsi_cmnd *sc_cmd)
1103 {
1104         return bnx2fc_initiate_tmf(sc_cmd, FCP_TMF_LUN_RESET);
1105 }
1106
1107 int bnx2fc_expl_logo(struct fc_lport *lport, struct bnx2fc_cmd *io_req)
1108 {
1109         struct bnx2fc_rport *tgt = io_req->tgt;
1110         struct fc_rport_priv *rdata = tgt->rdata;
1111         int logo_issued;
1112         int rc = SUCCESS;
1113         int wait_cnt = 0;
1114
1115         BNX2FC_IO_DBG(io_req, "Expl logo - tgt flags = 0x%lx\n",
1116                       tgt->flags);
1117         logo_issued = test_and_set_bit(BNX2FC_FLAG_EXPL_LOGO,
1118                                        &tgt->flags);
1119         io_req->wait_for_comp = 1;
1120         bnx2fc_initiate_cleanup(io_req);
1121
1122         spin_unlock_bh(&tgt->tgt_lock);
1123
1124         wait_for_completion(&io_req->tm_done);
1125
1126         io_req->wait_for_comp = 0;
1127         /*
1128          * release the reference taken in eh_abort to allow the
1129          * target to re-login after flushing IOs
1130          */
1131          kref_put(&io_req->refcount, bnx2fc_cmd_release);
1132
1133         if (!logo_issued) {
1134                 clear_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags);
1135                 mutex_lock(&lport->disc.disc_mutex);
1136                 lport->tt.rport_logoff(rdata);
1137                 mutex_unlock(&lport->disc.disc_mutex);
1138                 do {
1139                         msleep(BNX2FC_RELOGIN_WAIT_TIME);
1140                         if (wait_cnt++ > BNX2FC_RELOGIN_WAIT_CNT) {
1141                                 rc = FAILED;
1142                                 break;
1143                         }
1144                 } while (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags));
1145         }
1146         spin_lock_bh(&tgt->tgt_lock);
1147         return rc;
1148 }
1149 /**
1150  * bnx2fc_eh_abort - eh_abort_handler api to abort an outstanding
1151  *                      SCSI command
1152  *
1153  * @sc_cmd:     SCSI_ML command pointer
1154  *
1155  * SCSI abort request handler
1156  */
1157 int bnx2fc_eh_abort(struct scsi_cmnd *sc_cmd)
1158 {
1159         struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
1160         struct fc_rport_libfc_priv *rp = rport->dd_data;
1161         struct bnx2fc_cmd *io_req;
1162         struct fc_lport *lport;
1163         struct bnx2fc_rport *tgt;
1164         int rc = FAILED;
1165
1166
1167         rc = fc_block_scsi_eh(sc_cmd);
1168         if (rc)
1169                 return rc;
1170
1171         lport = shost_priv(sc_cmd->device->host);
1172         if ((lport->state != LPORT_ST_READY) || !(lport->link_up)) {
1173                 printk(KERN_ERR PFX "eh_abort: link not ready\n");
1174                 return rc;
1175         }
1176
1177         tgt = (struct bnx2fc_rport *)&rp[1];
1178
1179         BNX2FC_TGT_DBG(tgt, "Entered bnx2fc_eh_abort\n");
1180
1181         spin_lock_bh(&tgt->tgt_lock);
1182         io_req = (struct bnx2fc_cmd *)sc_cmd->SCp.ptr;
1183         if (!io_req) {
1184                 /* Command might have just completed */
1185                 printk(KERN_ERR PFX "eh_abort: io_req is NULL\n");
1186                 spin_unlock_bh(&tgt->tgt_lock);
1187                 return SUCCESS;
1188         }
1189         BNX2FC_IO_DBG(io_req, "eh_abort - refcnt = %d\n",
1190                       io_req->refcount.refcount.counter);
1191
1192         /* Hold IO request across abort processing */
1193         kref_get(&io_req->refcount);
1194
1195         BUG_ON(tgt != io_req->tgt);
1196
1197         /* Remove the io_req from the active_q. */
1198         /*
1199          * Task Mgmt functions (LUN RESET & TGT RESET) will not
1200          * issue an ABTS on this particular IO req, as the
1201          * io_req is no longer in the active_q.
1202          */
1203         if (tgt->flush_in_prog) {
1204                 printk(KERN_ERR PFX "eh_abort: io_req (xid = 0x%x) "
1205                         "flush in progress\n", io_req->xid);
1206                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1207                 spin_unlock_bh(&tgt->tgt_lock);
1208                 return SUCCESS;
1209         }
1210
1211         if (io_req->on_active_queue == 0) {
1212                 printk(KERN_ERR PFX "eh_abort: io_req (xid = 0x%x) "
1213                                 "not on active_q\n", io_req->xid);
1214                 /*
1215                  * This condition can happen only due to the FW bug,
1216                  * where we do not receive cleanup response from
1217                  * the FW. Handle this case gracefully by erroring
1218                  * back the IO request to SCSI-ml
1219                  */
1220                 bnx2fc_scsi_done(io_req, DID_ABORT);
1221
1222                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1223                 spin_unlock_bh(&tgt->tgt_lock);
1224                 return SUCCESS;
1225         }
1226
1227         /*
1228          * Only eh_abort processing will remove the IO from
1229          * active_cmd_q before processing the request. this is
1230          * done to avoid race conditions between IOs aborted
1231          * as part of task management completion and eh_abort
1232          * processing
1233          */
1234         list_del_init(&io_req->link);
1235         io_req->on_active_queue = 0;
1236         /* Move IO req to retire queue */
1237         list_add_tail(&io_req->link, &tgt->io_retire_queue);
1238
1239         init_completion(&io_req->tm_done);
1240
1241         if (test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags)) {
1242                 printk(KERN_ERR PFX "eh_abort: io_req (xid = 0x%x) "
1243                                 "already in abts processing\n", io_req->xid);
1244                 if (cancel_delayed_work(&io_req->timeout_work))
1245                         kref_put(&io_req->refcount,
1246                                  bnx2fc_cmd_release); /* drop timer hold */
1247                 rc = bnx2fc_expl_logo(lport, io_req);
1248                 goto out;
1249         }
1250
1251         /* Cancel the current timer running on this io_req */
1252         if (cancel_delayed_work(&io_req->timeout_work))
1253                 kref_put(&io_req->refcount,
1254                          bnx2fc_cmd_release); /* drop timer hold */
1255         set_bit(BNX2FC_FLAG_EH_ABORT, &io_req->req_flags);
1256         io_req->wait_for_comp = 1;
1257         rc = bnx2fc_initiate_abts(io_req);
1258         if (rc == FAILED) {
1259                 bnx2fc_initiate_cleanup(io_req);
1260                 spin_unlock_bh(&tgt->tgt_lock);
1261                 wait_for_completion(&io_req->tm_done);
1262                 spin_lock_bh(&tgt->tgt_lock);
1263                 io_req->wait_for_comp = 0;
1264                 goto done;
1265         }
1266         spin_unlock_bh(&tgt->tgt_lock);
1267
1268         wait_for_completion(&io_req->tm_done);
1269
1270         spin_lock_bh(&tgt->tgt_lock);
1271         io_req->wait_for_comp = 0;
1272         if (!(test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
1273                                     &io_req->req_flags))) {
1274                 /* Let the scsi-ml try to recover this command */
1275                 printk(KERN_ERR PFX "abort failed, xid = 0x%x\n",
1276                        io_req->xid);
1277                 rc = bnx2fc_expl_logo(lport, io_req);
1278                 goto out;
1279         } else {
1280                 /*
1281                  * We come here even when there was a race condition
1282                  * between timeout and abts completion, and abts
1283                  * completion happens just in time.
1284                  */
1285                 BNX2FC_IO_DBG(io_req, "abort succeeded\n");
1286                 rc = SUCCESS;
1287                 bnx2fc_scsi_done(io_req, DID_ABORT);
1288                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1289         }
1290 done:
1291         /* release the reference taken in eh_abort */
1292         kref_put(&io_req->refcount, bnx2fc_cmd_release);
1293 out:
1294         spin_unlock_bh(&tgt->tgt_lock);
1295         return rc;
1296 }
1297
1298 void bnx2fc_process_seq_cleanup_compl(struct bnx2fc_cmd *seq_clnp_req,
1299                                       struct fcoe_task_ctx_entry *task,
1300                                       u8 rx_state)
1301 {
1302         struct bnx2fc_els_cb_arg *cb_arg = seq_clnp_req->cb_arg;
1303         struct bnx2fc_cmd *orig_io_req = cb_arg->aborted_io_req;
1304         u32 offset = cb_arg->offset;
1305         enum fc_rctl r_ctl = cb_arg->r_ctl;
1306         int rc = 0;
1307         struct bnx2fc_rport *tgt = orig_io_req->tgt;
1308
1309         BNX2FC_IO_DBG(orig_io_req, "Entered process_cleanup_compl xid = 0x%x"
1310                               "cmd_type = %d\n",
1311                    seq_clnp_req->xid, seq_clnp_req->cmd_type);
1312
1313         if (rx_state == FCOE_TASK_RX_STATE_IGNORED_SEQUENCE_CLEANUP) {
1314                 printk(KERN_ERR PFX "seq cleanup ignored - xid = 0x%x\n",
1315                         seq_clnp_req->xid);
1316                 goto free_cb_arg;
1317         }
1318
1319         spin_unlock_bh(&tgt->tgt_lock);
1320         rc = bnx2fc_send_srr(orig_io_req, offset, r_ctl);
1321         spin_lock_bh(&tgt->tgt_lock);
1322
1323         if (rc)
1324                 printk(KERN_ERR PFX "clnup_compl: Unable to send SRR"
1325                         " IO will abort\n");
1326         seq_clnp_req->cb_arg = NULL;
1327         kref_put(&orig_io_req->refcount, bnx2fc_cmd_release);
1328 free_cb_arg:
1329         kfree(cb_arg);
1330         return;
1331 }
1332
1333 void bnx2fc_process_cleanup_compl(struct bnx2fc_cmd *io_req,
1334                                   struct fcoe_task_ctx_entry *task,
1335                                   u8 num_rq)
1336 {
1337         BNX2FC_IO_DBG(io_req, "Entered process_cleanup_compl "
1338                               "refcnt = %d, cmd_type = %d\n",
1339                    io_req->refcount.refcount.counter, io_req->cmd_type);
1340         bnx2fc_scsi_done(io_req, DID_ERROR);
1341         kref_put(&io_req->refcount, bnx2fc_cmd_release);
1342         if (io_req->wait_for_comp)
1343                 complete(&io_req->tm_done);
1344 }
1345
1346 void bnx2fc_process_abts_compl(struct bnx2fc_cmd *io_req,
1347                                struct fcoe_task_ctx_entry *task,
1348                                u8 num_rq)
1349 {
1350         u32 r_ctl;
1351         u32 r_a_tov = FC_DEF_R_A_TOV;
1352         u8 issue_rrq = 0;
1353         struct bnx2fc_rport *tgt = io_req->tgt;
1354
1355         BNX2FC_IO_DBG(io_req, "Entered process_abts_compl xid = 0x%x"
1356                               "refcnt = %d, cmd_type = %d\n",
1357                    io_req->xid,
1358                    io_req->refcount.refcount.counter, io_req->cmd_type);
1359
1360         if (test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
1361                                        &io_req->req_flags)) {
1362                 BNX2FC_IO_DBG(io_req, "Timer context finished processing"
1363                                 " this io\n");
1364                 return;
1365         }
1366
1367         /* Do not issue RRQ as this IO is already cleanedup */
1368         if (test_and_set_bit(BNX2FC_FLAG_IO_CLEANUP,
1369                                 &io_req->req_flags))
1370                 goto io_compl;
1371
1372         /*
1373          * For ABTS issued due to SCSI eh_abort_handler, timeout
1374          * values are maintained by scsi-ml itself. Cancel timeout
1375          * in case ABTS issued as part of task management function
1376          * or due to FW error.
1377          */
1378         if (test_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags))
1379                 if (cancel_delayed_work(&io_req->timeout_work))
1380                         kref_put(&io_req->refcount,
1381                                  bnx2fc_cmd_release); /* drop timer hold */
1382
1383         r_ctl = (u8)task->rxwr_only.union_ctx.comp_info.abts_rsp.r_ctl;
1384
1385         switch (r_ctl) {
1386         case FC_RCTL_BA_ACC:
1387                 /*
1388                  * Dont release this cmd yet. It will be relesed
1389                  * after we get RRQ response
1390                  */
1391                 BNX2FC_IO_DBG(io_req, "ABTS response - ACC Send RRQ\n");
1392                 issue_rrq = 1;
1393                 break;
1394
1395         case FC_RCTL_BA_RJT:
1396                 BNX2FC_IO_DBG(io_req, "ABTS response - RJT\n");
1397                 break;
1398         default:
1399                 printk(KERN_ERR PFX "Unknown ABTS response\n");
1400                 break;
1401         }
1402
1403         if (issue_rrq) {
1404                 BNX2FC_IO_DBG(io_req, "Issue RRQ after R_A_TOV\n");
1405                 set_bit(BNX2FC_FLAG_ISSUE_RRQ, &io_req->req_flags);
1406         }
1407         set_bit(BNX2FC_FLAG_RETIRE_OXID, &io_req->req_flags);
1408         bnx2fc_cmd_timer_set(io_req, r_a_tov);
1409
1410 io_compl:
1411         if (io_req->wait_for_comp) {
1412                 if (test_and_clear_bit(BNX2FC_FLAG_EH_ABORT,
1413                                        &io_req->req_flags))
1414                         complete(&io_req->tm_done);
1415         } else {
1416                 /*
1417                  * We end up here when ABTS is issued as
1418                  * in asynchronous context, i.e., as part
1419                  * of task management completion, or
1420                  * when FW error is received or when the
1421                  * ABTS is issued when the IO is timed
1422                  * out.
1423                  */
1424
1425                 if (io_req->on_active_queue) {
1426                         list_del_init(&io_req->link);
1427                         io_req->on_active_queue = 0;
1428                         /* Move IO req to retire queue */
1429                         list_add_tail(&io_req->link, &tgt->io_retire_queue);
1430                 }
1431                 bnx2fc_scsi_done(io_req, DID_ERROR);
1432                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1433         }
1434 }
1435
1436 static void bnx2fc_lun_reset_cmpl(struct bnx2fc_cmd *io_req)
1437 {
1438         struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1439         struct bnx2fc_rport *tgt = io_req->tgt;
1440         struct bnx2fc_cmd *cmd, *tmp;
1441         int tm_lun = sc_cmd->device->lun;
1442         int rc = 0;
1443         int lun;
1444
1445         /* called with tgt_lock held */
1446         BNX2FC_IO_DBG(io_req, "Entered bnx2fc_lun_reset_cmpl\n");
1447         /*
1448          * Walk thru the active_ios queue and ABORT the IO
1449          * that matches with the LUN that was reset
1450          */
1451         list_for_each_entry_safe(cmd, tmp, &tgt->active_cmd_queue, link) {
1452                 BNX2FC_TGT_DBG(tgt, "LUN RST cmpl: scan for pending IOs\n");
1453                 lun = cmd->sc_cmd->device->lun;
1454                 if (lun == tm_lun) {
1455                         /* Initiate ABTS on this cmd */
1456                         if (!test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS,
1457                                               &cmd->req_flags)) {
1458                                 /* cancel the IO timeout */
1459                                 if (cancel_delayed_work(&io_req->timeout_work))
1460                                         kref_put(&io_req->refcount,
1461                                                  bnx2fc_cmd_release);
1462                                                         /* timer hold */
1463                                 rc = bnx2fc_initiate_abts(cmd);
1464                                 /* abts shouldn't fail in this context */
1465                                 WARN_ON(rc != SUCCESS);
1466                         } else
1467                                 printk(KERN_ERR PFX "lun_rst: abts already in"
1468                                         " progress for this IO 0x%x\n",
1469                                         cmd->xid);
1470                 }
1471         }
1472 }
1473
1474 static void bnx2fc_tgt_reset_cmpl(struct bnx2fc_cmd *io_req)
1475 {
1476         struct bnx2fc_rport *tgt = io_req->tgt;
1477         struct bnx2fc_cmd *cmd, *tmp;
1478         int rc = 0;
1479
1480         /* called with tgt_lock held */
1481         BNX2FC_IO_DBG(io_req, "Entered bnx2fc_tgt_reset_cmpl\n");
1482         /*
1483          * Walk thru the active_ios queue and ABORT the IO
1484          * that matches with the LUN that was reset
1485          */
1486         list_for_each_entry_safe(cmd, tmp, &tgt->active_cmd_queue, link) {
1487                 BNX2FC_TGT_DBG(tgt, "TGT RST cmpl: scan for pending IOs\n");
1488                 /* Initiate ABTS */
1489                 if (!test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS,
1490                                                         &cmd->req_flags)) {
1491                         /* cancel the IO timeout */
1492                         if (cancel_delayed_work(&io_req->timeout_work))
1493                                 kref_put(&io_req->refcount,
1494                                          bnx2fc_cmd_release); /* timer hold */
1495                         rc = bnx2fc_initiate_abts(cmd);
1496                         /* abts shouldn't fail in this context */
1497                         WARN_ON(rc != SUCCESS);
1498
1499                 } else
1500                         printk(KERN_ERR PFX "tgt_rst: abts already in progress"
1501                                 " for this IO 0x%x\n", cmd->xid);
1502         }
1503 }
1504
1505 void bnx2fc_process_tm_compl(struct bnx2fc_cmd *io_req,
1506                              struct fcoe_task_ctx_entry *task, u8 num_rq)
1507 {
1508         struct bnx2fc_mp_req *tm_req;
1509         struct fc_frame_header *fc_hdr;
1510         struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1511         u64 *hdr;
1512         u64 *temp_hdr;
1513         void *rsp_buf;
1514
1515         /* Called with tgt_lock held */
1516         BNX2FC_IO_DBG(io_req, "Entered process_tm_compl\n");
1517
1518         if (!(test_bit(BNX2FC_FLAG_TM_TIMEOUT, &io_req->req_flags)))
1519                 set_bit(BNX2FC_FLAG_TM_COMPL, &io_req->req_flags);
1520         else {
1521                 /* TM has already timed out and we got
1522                  * delayed completion. Ignore completion
1523                  * processing.
1524                  */
1525                 return;
1526         }
1527
1528         tm_req = &(io_req->mp_req);
1529         fc_hdr = &(tm_req->resp_fc_hdr);
1530         hdr = (u64 *)fc_hdr;
1531         temp_hdr = (u64 *)
1532                 &task->rxwr_only.union_ctx.comp_info.mp_rsp.fc_hdr;
1533         hdr[0] = cpu_to_be64(temp_hdr[0]);
1534         hdr[1] = cpu_to_be64(temp_hdr[1]);
1535         hdr[2] = cpu_to_be64(temp_hdr[2]);
1536
1537         tm_req->resp_len =
1538                 task->rxwr_only.union_ctx.comp_info.mp_rsp.mp_payload_len;
1539
1540         rsp_buf = tm_req->resp_buf;
1541
1542         if (fc_hdr->fh_r_ctl == FC_RCTL_DD_CMD_STATUS) {
1543                 bnx2fc_parse_fcp_rsp(io_req,
1544                                      (struct fcoe_fcp_rsp_payload *)
1545                                      rsp_buf, num_rq);
1546                 if (io_req->fcp_rsp_code == 0) {
1547                         /* TM successful */
1548                         if (tm_req->tm_flags & FCP_TMF_LUN_RESET)
1549                                 bnx2fc_lun_reset_cmpl(io_req);
1550                         else if (tm_req->tm_flags & FCP_TMF_TGT_RESET)
1551                                 bnx2fc_tgt_reset_cmpl(io_req);
1552                 }
1553         } else {
1554                 printk(KERN_ERR PFX "tmf's fc_hdr r_ctl = 0x%x\n",
1555                         fc_hdr->fh_r_ctl);
1556         }
1557         if (!sc_cmd->SCp.ptr) {
1558                 printk(KERN_ERR PFX "tm_compl: SCp.ptr is NULL\n");
1559                 return;
1560         }
1561         switch (io_req->fcp_status) {
1562         case FC_GOOD:
1563                 if (io_req->cdb_status == 0) {
1564                         /* Good IO completion */
1565                         sc_cmd->result = DID_OK << 16;
1566                 } else {
1567                         /* Transport status is good, SCSI status not good */
1568                         sc_cmd->result = (DID_OK << 16) | io_req->cdb_status;
1569                 }
1570                 if (io_req->fcp_resid)
1571                         scsi_set_resid(sc_cmd, io_req->fcp_resid);
1572                 break;
1573
1574         default:
1575                 BNX2FC_IO_DBG(io_req, "process_tm_compl: fcp_status = %d\n",
1576                            io_req->fcp_status);
1577                 break;
1578         }
1579
1580         sc_cmd = io_req->sc_cmd;
1581         io_req->sc_cmd = NULL;
1582
1583         /* check if the io_req exists in tgt's tmf_q */
1584         if (io_req->on_tmf_queue) {
1585
1586                 list_del_init(&io_req->link);
1587                 io_req->on_tmf_queue = 0;
1588         } else {
1589
1590                 printk(KERN_ERR PFX "Command not on active_cmd_queue!\n");
1591                 return;
1592         }
1593
1594         sc_cmd->SCp.ptr = NULL;
1595         sc_cmd->scsi_done(sc_cmd);
1596
1597         kref_put(&io_req->refcount, bnx2fc_cmd_release);
1598         if (io_req->wait_for_comp) {
1599                 BNX2FC_IO_DBG(io_req, "tm_compl - wake up the waiter\n");
1600                 complete(&io_req->tm_done);
1601         }
1602 }
1603
1604 static int bnx2fc_split_bd(struct bnx2fc_cmd *io_req, u64 addr, int sg_len,
1605                            int bd_index)
1606 {
1607         struct fcoe_bd_ctx *bd = io_req->bd_tbl->bd_tbl;
1608         int frag_size, sg_frags;
1609
1610         sg_frags = 0;
1611         while (sg_len) {
1612                 if (sg_len >= BNX2FC_BD_SPLIT_SZ)
1613                         frag_size = BNX2FC_BD_SPLIT_SZ;
1614                 else
1615                         frag_size = sg_len;
1616                 bd[bd_index + sg_frags].buf_addr_lo = addr & 0xffffffff;
1617                 bd[bd_index + sg_frags].buf_addr_hi  = addr >> 32;
1618                 bd[bd_index + sg_frags].buf_len = (u16)frag_size;
1619                 bd[bd_index + sg_frags].flags = 0;
1620
1621                 addr += (u64) frag_size;
1622                 sg_frags++;
1623                 sg_len -= frag_size;
1624         }
1625         return sg_frags;
1626
1627 }
1628
1629 static int bnx2fc_map_sg(struct bnx2fc_cmd *io_req)
1630 {
1631         struct bnx2fc_interface *interface = io_req->port->priv;
1632         struct bnx2fc_hba *hba = interface->hba;
1633         struct scsi_cmnd *sc = io_req->sc_cmd;
1634         struct fcoe_bd_ctx *bd = io_req->bd_tbl->bd_tbl;
1635         struct scatterlist *sg;
1636         int byte_count = 0;
1637         int sg_count = 0;
1638         int bd_count = 0;
1639         int sg_frags;
1640         unsigned int sg_len;
1641         u64 addr;
1642         int i;
1643
1644         sg_count = dma_map_sg(&hba->pcidev->dev, scsi_sglist(sc),
1645                               scsi_sg_count(sc), sc->sc_data_direction);
1646         scsi_for_each_sg(sc, sg, sg_count, i) {
1647                 sg_len = sg_dma_len(sg);
1648                 addr = sg_dma_address(sg);
1649                 if (sg_len > BNX2FC_MAX_BD_LEN) {
1650                         sg_frags = bnx2fc_split_bd(io_req, addr, sg_len,
1651                                                    bd_count);
1652                 } else {
1653
1654                         sg_frags = 1;
1655                         bd[bd_count].buf_addr_lo = addr & 0xffffffff;
1656                         bd[bd_count].buf_addr_hi  = addr >> 32;
1657                         bd[bd_count].buf_len = (u16)sg_len;
1658                         bd[bd_count].flags = 0;
1659                 }
1660                 bd_count += sg_frags;
1661                 byte_count += sg_len;
1662         }
1663         if (byte_count != scsi_bufflen(sc))
1664                 printk(KERN_ERR PFX "byte_count = %d != scsi_bufflen = %d, "
1665                         "task_id = 0x%x\n", byte_count, scsi_bufflen(sc),
1666                         io_req->xid);
1667         return bd_count;
1668 }
1669
1670 static int bnx2fc_build_bd_list_from_sg(struct bnx2fc_cmd *io_req)
1671 {
1672         struct scsi_cmnd *sc = io_req->sc_cmd;
1673         struct fcoe_bd_ctx *bd = io_req->bd_tbl->bd_tbl;
1674         int bd_count;
1675
1676         if (scsi_sg_count(sc)) {
1677                 bd_count = bnx2fc_map_sg(io_req);
1678                 if (bd_count == 0)
1679                         return -ENOMEM;
1680         } else {
1681                 bd_count = 0;
1682                 bd[0].buf_addr_lo = bd[0].buf_addr_hi = 0;
1683                 bd[0].buf_len = bd[0].flags = 0;
1684         }
1685         io_req->bd_tbl->bd_valid = bd_count;
1686
1687         return 0;
1688 }
1689
1690 static void bnx2fc_unmap_sg_list(struct bnx2fc_cmd *io_req)
1691 {
1692         struct scsi_cmnd *sc = io_req->sc_cmd;
1693
1694         if (io_req->bd_tbl->bd_valid && sc) {
1695                 scsi_dma_unmap(sc);
1696                 io_req->bd_tbl->bd_valid = 0;
1697         }
1698 }
1699
1700 void bnx2fc_build_fcp_cmnd(struct bnx2fc_cmd *io_req,
1701                                   struct fcp_cmnd *fcp_cmnd)
1702 {
1703         struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1704         char tag[2];
1705
1706         memset(fcp_cmnd, 0, sizeof(struct fcp_cmnd));
1707
1708         int_to_scsilun(sc_cmd->device->lun, &fcp_cmnd->fc_lun);
1709
1710         fcp_cmnd->fc_dl = htonl(io_req->data_xfer_len);
1711         memcpy(fcp_cmnd->fc_cdb, sc_cmd->cmnd, sc_cmd->cmd_len);
1712
1713         fcp_cmnd->fc_cmdref = 0;
1714         fcp_cmnd->fc_pri_ta = 0;
1715         fcp_cmnd->fc_tm_flags = io_req->mp_req.tm_flags;
1716         fcp_cmnd->fc_flags = io_req->io_req_flags;
1717
1718         if (scsi_populate_tag_msg(sc_cmd, tag)) {
1719                 switch (tag[0]) {
1720                 case HEAD_OF_QUEUE_TAG:
1721                         fcp_cmnd->fc_pri_ta = FCP_PTA_HEADQ;
1722                         break;
1723                 case ORDERED_QUEUE_TAG:
1724                         fcp_cmnd->fc_pri_ta = FCP_PTA_ORDERED;
1725                         break;
1726                 default:
1727                         fcp_cmnd->fc_pri_ta = FCP_PTA_SIMPLE;
1728                         break;
1729                 }
1730         } else {
1731                 fcp_cmnd->fc_pri_ta = 0;
1732         }
1733 }
1734
1735 static void bnx2fc_parse_fcp_rsp(struct bnx2fc_cmd *io_req,
1736                                  struct fcoe_fcp_rsp_payload *fcp_rsp,
1737                                  u8 num_rq)
1738 {
1739         struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1740         struct bnx2fc_rport *tgt = io_req->tgt;
1741         u8 rsp_flags = fcp_rsp->fcp_flags.flags;
1742         u32 rq_buff_len = 0;
1743         int i;
1744         unsigned char *rq_data;
1745         unsigned char *dummy;
1746         int fcp_sns_len = 0;
1747         int fcp_rsp_len = 0;
1748
1749         io_req->fcp_status = FC_GOOD;
1750         io_req->fcp_resid = fcp_rsp->fcp_resid;
1751
1752         io_req->scsi_comp_flags = rsp_flags;
1753         CMD_SCSI_STATUS(sc_cmd) = io_req->cdb_status =
1754                                 fcp_rsp->scsi_status_code;
1755
1756         /* Fetch fcp_rsp_info and fcp_sns_info if available */
1757         if (num_rq) {
1758
1759                 /*
1760                  * We do not anticipate num_rq >1, as the linux defined
1761                  * SCSI_SENSE_BUFFERSIZE is 96 bytes + 8 bytes of FCP_RSP_INFO
1762                  * 256 bytes of single rq buffer is good enough to hold this.
1763                  */
1764
1765                 if (rsp_flags &
1766                     FCOE_FCP_RSP_FLAGS_FCP_RSP_LEN_VALID) {
1767                         fcp_rsp_len = rq_buff_len
1768                                         = fcp_rsp->fcp_rsp_len;
1769                 }
1770
1771                 if (rsp_flags &
1772                     FCOE_FCP_RSP_FLAGS_FCP_SNS_LEN_VALID) {
1773                         fcp_sns_len = fcp_rsp->fcp_sns_len;
1774                         rq_buff_len += fcp_rsp->fcp_sns_len;
1775                 }
1776
1777                 io_req->fcp_rsp_len = fcp_rsp_len;
1778                 io_req->fcp_sns_len = fcp_sns_len;
1779
1780                 if (rq_buff_len > num_rq * BNX2FC_RQ_BUF_SZ) {
1781                         /* Invalid sense sense length. */
1782                         printk(KERN_ERR PFX "invalid sns length %d\n",
1783                                 rq_buff_len);
1784                         /* reset rq_buff_len */
1785                         rq_buff_len =  num_rq * BNX2FC_RQ_BUF_SZ;
1786                 }
1787
1788                 rq_data = bnx2fc_get_next_rqe(tgt, 1);
1789
1790                 if (num_rq > 1) {
1791                         /* We do not need extra sense data */
1792                         for (i = 1; i < num_rq; i++)
1793                                 dummy = bnx2fc_get_next_rqe(tgt, 1);
1794                 }
1795
1796                 /* fetch fcp_rsp_code */
1797                 if ((fcp_rsp_len == 4) || (fcp_rsp_len == 8)) {
1798                         /* Only for task management function */
1799                         io_req->fcp_rsp_code = rq_data[3];
1800                         printk(KERN_ERR PFX "fcp_rsp_code = %d\n",
1801                                 io_req->fcp_rsp_code);
1802                 }
1803
1804                 /* fetch sense data */
1805                 rq_data += fcp_rsp_len;
1806
1807                 if (fcp_sns_len > SCSI_SENSE_BUFFERSIZE) {
1808                         printk(KERN_ERR PFX "Truncating sense buffer\n");
1809                         fcp_sns_len = SCSI_SENSE_BUFFERSIZE;
1810                 }
1811
1812                 memset(sc_cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1813                 if (fcp_sns_len)
1814                         memcpy(sc_cmd->sense_buffer, rq_data, fcp_sns_len);
1815
1816                 /* return RQ entries */
1817                 for (i = 0; i < num_rq; i++)
1818                         bnx2fc_return_rqe(tgt, 1);
1819         }
1820 }
1821
1822 /**
1823  * bnx2fc_queuecommand - Queuecommand function of the scsi template
1824  *
1825  * @host:       The Scsi_Host the command was issued to
1826  * @sc_cmd:     struct scsi_cmnd to be executed
1827  *
1828  * This is the IO strategy routine, called by SCSI-ML
1829  **/
1830 int bnx2fc_queuecommand(struct Scsi_Host *host,
1831                         struct scsi_cmnd *sc_cmd)
1832 {
1833         struct fc_lport *lport = shost_priv(host);
1834         struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
1835         struct fc_rport_libfc_priv *rp = rport->dd_data;
1836         struct bnx2fc_rport *tgt;
1837         struct bnx2fc_cmd *io_req;
1838         int rc = 0;
1839         int rval;
1840
1841         rval = fc_remote_port_chkready(rport);
1842         if (rval) {
1843                 sc_cmd->result = rval;
1844                 sc_cmd->scsi_done(sc_cmd);
1845                 return 0;
1846         }
1847
1848         if ((lport->state != LPORT_ST_READY) || !(lport->link_up)) {
1849                 rc = SCSI_MLQUEUE_HOST_BUSY;
1850                 goto exit_qcmd;
1851         }
1852
1853         /* rport and tgt are allocated together, so tgt should be non-NULL */
1854         tgt = (struct bnx2fc_rport *)&rp[1];
1855
1856         if (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags)) {
1857                 /*
1858                  * Session is not offloaded yet. Let SCSI-ml retry
1859                  * the command.
1860                  */
1861                 rc = SCSI_MLQUEUE_TARGET_BUSY;
1862                 goto exit_qcmd;
1863         }
1864
1865         io_req = bnx2fc_cmd_alloc(tgt);
1866         if (!io_req) {
1867                 rc = SCSI_MLQUEUE_HOST_BUSY;
1868                 goto exit_qcmd;
1869         }
1870         io_req->sc_cmd = sc_cmd;
1871
1872         if (bnx2fc_post_io_req(tgt, io_req)) {
1873                 printk(KERN_ERR PFX "Unable to post io_req\n");
1874                 rc = SCSI_MLQUEUE_HOST_BUSY;
1875                 goto exit_qcmd;
1876         }
1877 exit_qcmd:
1878         return rc;
1879 }
1880
1881 void bnx2fc_process_scsi_cmd_compl(struct bnx2fc_cmd *io_req,
1882                                    struct fcoe_task_ctx_entry *task,
1883                                    u8 num_rq)
1884 {
1885         struct fcoe_fcp_rsp_payload *fcp_rsp;
1886         struct bnx2fc_rport *tgt = io_req->tgt;
1887         struct scsi_cmnd *sc_cmd;
1888         struct Scsi_Host *host;
1889
1890
1891         /* scsi_cmd_cmpl is called with tgt lock held */
1892
1893         if (test_and_set_bit(BNX2FC_FLAG_IO_COMPL, &io_req->req_flags)) {
1894                 /* we will not receive ABTS response for this IO */
1895                 BNX2FC_IO_DBG(io_req, "Timer context finished processing "
1896                            "this scsi cmd\n");
1897         }
1898
1899         /* Cancel the timeout_work, as we received IO completion */
1900         if (cancel_delayed_work(&io_req->timeout_work))
1901                 kref_put(&io_req->refcount,
1902                          bnx2fc_cmd_release); /* drop timer hold */
1903
1904         sc_cmd = io_req->sc_cmd;
1905         if (sc_cmd == NULL) {
1906                 printk(KERN_ERR PFX "scsi_cmd_compl - sc_cmd is NULL\n");
1907                 return;
1908         }
1909
1910         /* Fetch fcp_rsp from task context and perform cmd completion */
1911         fcp_rsp = (struct fcoe_fcp_rsp_payload *)
1912                    &(task->rxwr_only.union_ctx.comp_info.fcp_rsp.payload);
1913
1914         /* parse fcp_rsp and obtain sense data from RQ if available */
1915         bnx2fc_parse_fcp_rsp(io_req, fcp_rsp, num_rq);
1916
1917         host = sc_cmd->device->host;
1918         if (!sc_cmd->SCp.ptr) {
1919                 printk(KERN_ERR PFX "SCp.ptr is NULL\n");
1920                 return;
1921         }
1922
1923         if (io_req->on_active_queue) {
1924                 list_del_init(&io_req->link);
1925                 io_req->on_active_queue = 0;
1926                 /* Move IO req to retire queue */
1927                 list_add_tail(&io_req->link, &tgt->io_retire_queue);
1928         } else {
1929                 /* This should not happen, but could have been pulled
1930                  * by bnx2fc_flush_active_ios(), or during a race
1931                  * between command abort and (late) completion.
1932                  */
1933                 BNX2FC_IO_DBG(io_req, "xid not on active_cmd_queue\n");
1934                 if (io_req->wait_for_comp)
1935                         if (test_and_clear_bit(BNX2FC_FLAG_EH_ABORT,
1936                                                &io_req->req_flags))
1937                                 complete(&io_req->tm_done);
1938         }
1939
1940         bnx2fc_unmap_sg_list(io_req);
1941         io_req->sc_cmd = NULL;
1942
1943         switch (io_req->fcp_status) {
1944         case FC_GOOD:
1945                 if (io_req->cdb_status == 0) {
1946                         /* Good IO completion */
1947                         sc_cmd->result = DID_OK << 16;
1948                 } else {
1949                         /* Transport status is good, SCSI status not good */
1950                         BNX2FC_IO_DBG(io_req, "scsi_cmpl: cdb_status = %d"
1951                                  " fcp_resid = 0x%x\n",
1952                                 io_req->cdb_status, io_req->fcp_resid);
1953                         sc_cmd->result = (DID_OK << 16) | io_req->cdb_status;
1954                 }
1955                 if (io_req->fcp_resid)
1956                         scsi_set_resid(sc_cmd, io_req->fcp_resid);
1957                 break;
1958         default:
1959                 printk(KERN_ERR PFX "scsi_cmd_compl: fcp_status = %d\n",
1960                         io_req->fcp_status);
1961                 break;
1962         }
1963         sc_cmd->SCp.ptr = NULL;
1964         sc_cmd->scsi_done(sc_cmd);
1965         kref_put(&io_req->refcount, bnx2fc_cmd_release);
1966 }
1967
1968 int bnx2fc_post_io_req(struct bnx2fc_rport *tgt,
1969                                struct bnx2fc_cmd *io_req)
1970 {
1971         struct fcoe_task_ctx_entry *task;
1972         struct fcoe_task_ctx_entry *task_page;
1973         struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1974         struct fcoe_port *port = tgt->port;
1975         struct bnx2fc_interface *interface = port->priv;
1976         struct bnx2fc_hba *hba = interface->hba;
1977         struct fc_lport *lport = port->lport;
1978         struct fc_stats *stats;
1979         int task_idx, index;
1980         u16 xid;
1981
1982         /* Initialize rest of io_req fields */
1983         io_req->cmd_type = BNX2FC_SCSI_CMD;
1984         io_req->port = port;
1985         io_req->tgt = tgt;
1986         io_req->data_xfer_len = scsi_bufflen(sc_cmd);
1987         sc_cmd->SCp.ptr = (char *)io_req;
1988
1989         stats = per_cpu_ptr(lport->stats, get_cpu());
1990         if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE) {
1991                 io_req->io_req_flags = BNX2FC_READ;
1992                 stats->InputRequests++;
1993                 stats->InputBytes += io_req->data_xfer_len;
1994         } else if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) {
1995                 io_req->io_req_flags = BNX2FC_WRITE;
1996                 stats->OutputRequests++;
1997                 stats->OutputBytes += io_req->data_xfer_len;
1998         } else {
1999                 io_req->io_req_flags = 0;
2000                 stats->ControlRequests++;
2001         }
2002         put_cpu();
2003
2004         xid = io_req->xid;
2005
2006         /* Build buffer descriptor list for firmware from sg list */
2007         if (bnx2fc_build_bd_list_from_sg(io_req)) {
2008                 printk(KERN_ERR PFX "BD list creation failed\n");
2009                 spin_lock_bh(&tgt->tgt_lock);
2010                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
2011                 spin_unlock_bh(&tgt->tgt_lock);
2012                 return -EAGAIN;
2013         }
2014
2015         task_idx = xid / BNX2FC_TASKS_PER_PAGE;
2016         index = xid % BNX2FC_TASKS_PER_PAGE;
2017
2018         /* Initialize task context for this IO request */
2019         task_page = (struct fcoe_task_ctx_entry *) hba->task_ctx[task_idx];
2020         task = &(task_page[index]);
2021         bnx2fc_init_task(io_req, task);
2022
2023         spin_lock_bh(&tgt->tgt_lock);
2024
2025         if (tgt->flush_in_prog) {
2026                 printk(KERN_ERR PFX "Flush in progress..Host Busy\n");
2027                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
2028                 spin_unlock_bh(&tgt->tgt_lock);
2029                 return -EAGAIN;
2030         }
2031
2032         if (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags)) {
2033                 printk(KERN_ERR PFX "Session not ready...post_io\n");
2034                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
2035                 spin_unlock_bh(&tgt->tgt_lock);
2036                 return -EAGAIN;
2037         }
2038
2039         /* Time IO req */
2040         if (tgt->io_timeout)
2041                 bnx2fc_cmd_timer_set(io_req, BNX2FC_IO_TIMEOUT);
2042         /* Obtain free SQ entry */
2043         bnx2fc_add_2_sq(tgt, xid);
2044
2045         /* Enqueue the io_req to active_cmd_queue */
2046
2047         io_req->on_active_queue = 1;
2048         /* move io_req from pending_queue to active_queue */
2049         list_add_tail(&io_req->link, &tgt->active_cmd_queue);
2050
2051         /* Ring doorbell */
2052         bnx2fc_ring_doorbell(tgt);
2053         spin_unlock_bh(&tgt->tgt_lock);
2054         return 0;
2055 }