linux/drivers/scsi/bnx2fc/bnx2fc_io.c
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   1/* bnx2fc_io.c: QLogic Linux FCoE offload driver.
   2 * IO manager and SCSI IO processing.
   3 *
   4 * Copyright (c) 2008-2013 Broadcom Corporation
   5 * Copyright (c) 2014-2016 QLogic Corporation
   6 * Copyright (c) 2016-2017 Cavium Inc.
   7 *
   8 * This program is free software; you can redistribute it and/or modify
   9 * it under the terms of the GNU General Public License as published by
  10 * the Free Software Foundation.
  11 *
  12 * Written by: Bhanu Prakash Gollapudi (bprakash@broadcom.com)
  13 */
  14
  15#include "bnx2fc.h"
  16
  17#define RESERVE_FREE_LIST_INDEX num_possible_cpus()
  18
  19static int bnx2fc_split_bd(struct bnx2fc_cmd *io_req, u64 addr, int sg_len,
  20                           int bd_index);
  21static int bnx2fc_map_sg(struct bnx2fc_cmd *io_req);
  22static int bnx2fc_build_bd_list_from_sg(struct bnx2fc_cmd *io_req);
  23static void bnx2fc_unmap_sg_list(struct bnx2fc_cmd *io_req);
  24static void bnx2fc_free_mp_resc(struct bnx2fc_cmd *io_req);
  25static void bnx2fc_parse_fcp_rsp(struct bnx2fc_cmd *io_req,
  26                                 struct fcoe_fcp_rsp_payload *fcp_rsp,
  27                                 u8 num_rq);
  28
  29void bnx2fc_cmd_timer_set(struct bnx2fc_cmd *io_req,
  30                          unsigned int timer_msec)
  31{
  32        struct bnx2fc_interface *interface = io_req->port->priv;
  33
  34        if (queue_delayed_work(interface->timer_work_queue,
  35                               &io_req->timeout_work,
  36                               msecs_to_jiffies(timer_msec)))
  37                kref_get(&io_req->refcount);
  38}
  39
  40static void bnx2fc_cmd_timeout(struct work_struct *work)
  41{
  42        struct bnx2fc_cmd *io_req = container_of(work, struct bnx2fc_cmd,
  43                                                 timeout_work.work);
  44        u8 cmd_type = io_req->cmd_type;
  45        struct bnx2fc_rport *tgt = io_req->tgt;
  46        int rc;
  47
  48        BNX2FC_IO_DBG(io_req, "cmd_timeout, cmd_type = %d,"
  49                      "req_flags = %lx\n", cmd_type, io_req->req_flags);
  50
  51        spin_lock_bh(&tgt->tgt_lock);
  52        if (test_and_clear_bit(BNX2FC_FLAG_ISSUE_RRQ, &io_req->req_flags)) {
  53                clear_bit(BNX2FC_FLAG_RETIRE_OXID, &io_req->req_flags);
  54                /*
  55                 * ideally we should hold the io_req until RRQ complets,
  56                 * and release io_req from timeout hold.
  57                 */
  58                spin_unlock_bh(&tgt->tgt_lock);
  59                bnx2fc_send_rrq(io_req);
  60                return;
  61        }
  62        if (test_and_clear_bit(BNX2FC_FLAG_RETIRE_OXID, &io_req->req_flags)) {
  63                BNX2FC_IO_DBG(io_req, "IO ready for reuse now\n");
  64                goto done;
  65        }
  66
  67        switch (cmd_type) {
  68        case BNX2FC_SCSI_CMD:
  69                if (test_and_clear_bit(BNX2FC_FLAG_EH_ABORT,
  70                                                        &io_req->req_flags)) {
  71                        /* Handle eh_abort timeout */
  72                        BNX2FC_IO_DBG(io_req, "eh_abort timed out\n");
  73                        complete(&io_req->abts_done);
  74                } else if (test_bit(BNX2FC_FLAG_ISSUE_ABTS,
  75                                    &io_req->req_flags)) {
  76                        /* Handle internally generated ABTS timeout */
  77                        BNX2FC_IO_DBG(io_req, "ABTS timed out refcnt = %d\n",
  78                                        kref_read(&io_req->refcount));
  79                        if (!(test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
  80                                               &io_req->req_flags))) {
  81                                /*
  82                                 * Cleanup and return original command to
  83                                 * mid-layer.
  84                                 */
  85                                bnx2fc_initiate_cleanup(io_req);
  86                                kref_put(&io_req->refcount, bnx2fc_cmd_release);
  87                                spin_unlock_bh(&tgt->tgt_lock);
  88
  89                                return;
  90                        }
  91                } else {
  92                        /* Hanlde IO timeout */
  93                        BNX2FC_IO_DBG(io_req, "IO timed out. issue ABTS\n");
  94                        if (test_and_set_bit(BNX2FC_FLAG_IO_COMPL,
  95                                             &io_req->req_flags)) {
  96                                BNX2FC_IO_DBG(io_req, "IO completed before "
  97                                                           " timer expiry\n");
  98                                goto done;
  99                        }
 100
 101                        if (!test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS,
 102                                              &io_req->req_flags)) {
 103                                rc = bnx2fc_initiate_abts(io_req);
 104                                if (rc == SUCCESS)
 105                                        goto done;
 106
 107                                kref_put(&io_req->refcount, bnx2fc_cmd_release);
 108                                spin_unlock_bh(&tgt->tgt_lock);
 109
 110                                return;
 111                        } else {
 112                                BNX2FC_IO_DBG(io_req, "IO already in "
 113                                                      "ABTS processing\n");
 114                        }
 115                }
 116                break;
 117        case BNX2FC_ELS:
 118
 119                if (test_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags)) {
 120                        BNX2FC_IO_DBG(io_req, "ABTS for ELS timed out\n");
 121
 122                        if (!test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
 123                                              &io_req->req_flags)) {
 124                                kref_put(&io_req->refcount, bnx2fc_cmd_release);
 125                                spin_unlock_bh(&tgt->tgt_lock);
 126
 127                                return;
 128                        }
 129                } else {
 130                        /*
 131                         * Handle ELS timeout.
 132                         * tgt_lock is used to sync compl path and timeout
 133                         * path. If els compl path is processing this IO, we
 134                         * have nothing to do here, just release the timer hold
 135                         */
 136                        BNX2FC_IO_DBG(io_req, "ELS timed out\n");
 137                        if (test_and_set_bit(BNX2FC_FLAG_ELS_DONE,
 138                                               &io_req->req_flags))
 139                                goto done;
 140
 141                        /* Indicate the cb_func that this ELS is timed out */
 142                        set_bit(BNX2FC_FLAG_ELS_TIMEOUT, &io_req->req_flags);
 143
 144                        if ((io_req->cb_func) && (io_req->cb_arg)) {
 145                                io_req->cb_func(io_req->cb_arg);
 146                                io_req->cb_arg = NULL;
 147                        }
 148                }
 149                break;
 150        default:
 151                printk(KERN_ERR PFX "cmd_timeout: invalid cmd_type %d\n",
 152                        cmd_type);
 153                break;
 154        }
 155
 156done:
 157        /* release the cmd that was held when timer was set */
 158        kref_put(&io_req->refcount, bnx2fc_cmd_release);
 159        spin_unlock_bh(&tgt->tgt_lock);
 160}
 161
 162static void bnx2fc_scsi_done(struct bnx2fc_cmd *io_req, int err_code)
 163{
 164        /* Called with host lock held */
 165        struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
 166
 167        /*
 168         * active_cmd_queue may have other command types as well,
 169         * and during flush operation,  we want to error back only
 170         * scsi commands.
 171         */
 172        if (io_req->cmd_type != BNX2FC_SCSI_CMD)
 173                return;
 174
 175        BNX2FC_IO_DBG(io_req, "scsi_done. err_code = 0x%x\n", err_code);
 176        if (test_bit(BNX2FC_FLAG_CMD_LOST, &io_req->req_flags)) {
 177                /* Do not call scsi done for this IO */
 178                return;
 179        }
 180
 181        bnx2fc_unmap_sg_list(io_req);
 182        io_req->sc_cmd = NULL;
 183
 184        /* Sanity checks before returning command to mid-layer */
 185        if (!sc_cmd) {
 186                printk(KERN_ERR PFX "scsi_done - sc_cmd NULL. "
 187                                    "IO(0x%x) already cleaned up\n",
 188                       io_req->xid);
 189                return;
 190        }
 191        if (!sc_cmd->device) {
 192                pr_err(PFX "0x%x: sc_cmd->device is NULL.\n", io_req->xid);
 193                return;
 194        }
 195        if (!sc_cmd->device->host) {
 196                pr_err(PFX "0x%x: sc_cmd->device->host is NULL.\n",
 197                    io_req->xid);
 198                return;
 199        }
 200
 201        sc_cmd->result = err_code << 16;
 202
 203        BNX2FC_IO_DBG(io_req, "sc=%p, result=0x%x, retries=%d, allowed=%d\n",
 204                sc_cmd, host_byte(sc_cmd->result), sc_cmd->retries,
 205                sc_cmd->allowed);
 206        scsi_set_resid(sc_cmd, scsi_bufflen(sc_cmd));
 207        sc_cmd->SCp.ptr = NULL;
 208        sc_cmd->scsi_done(sc_cmd);
 209}
 210
 211struct bnx2fc_cmd_mgr *bnx2fc_cmd_mgr_alloc(struct bnx2fc_hba *hba)
 212{
 213        struct bnx2fc_cmd_mgr *cmgr;
 214        struct io_bdt *bdt_info;
 215        struct bnx2fc_cmd *io_req;
 216        size_t len;
 217        u32 mem_size;
 218        u16 xid;
 219        int i;
 220        int num_ios, num_pri_ios;
 221        size_t bd_tbl_sz;
 222        int arr_sz = num_possible_cpus() + 1;
 223        u16 min_xid = BNX2FC_MIN_XID;
 224        u16 max_xid = hba->max_xid;
 225
 226        if (max_xid <= min_xid || max_xid == FC_XID_UNKNOWN) {
 227                printk(KERN_ERR PFX "cmd_mgr_alloc: Invalid min_xid 0x%x \
 228                                        and max_xid 0x%x\n", min_xid, max_xid);
 229                return NULL;
 230        }
 231        BNX2FC_MISC_DBG("min xid 0x%x, max xid 0x%x\n", min_xid, max_xid);
 232
 233        num_ios = max_xid - min_xid + 1;
 234        len = (num_ios * (sizeof(struct bnx2fc_cmd *)));
 235        len += sizeof(struct bnx2fc_cmd_mgr);
 236
 237        cmgr = kzalloc(len, GFP_KERNEL);
 238        if (!cmgr) {
 239                printk(KERN_ERR PFX "failed to alloc cmgr\n");
 240                return NULL;
 241        }
 242
 243        cmgr->hba = hba;
 244        cmgr->free_list = kcalloc(arr_sz, sizeof(*cmgr->free_list),
 245                                  GFP_KERNEL);
 246        if (!cmgr->free_list) {
 247                printk(KERN_ERR PFX "failed to alloc free_list\n");
 248                goto mem_err;
 249        }
 250
 251        cmgr->free_list_lock = kcalloc(arr_sz, sizeof(*cmgr->free_list_lock),
 252                                       GFP_KERNEL);
 253        if (!cmgr->free_list_lock) {
 254                printk(KERN_ERR PFX "failed to alloc free_list_lock\n");
 255                kfree(cmgr->free_list);
 256                cmgr->free_list = NULL;
 257                goto mem_err;
 258        }
 259
 260        cmgr->cmds = (struct bnx2fc_cmd **)(cmgr + 1);
 261
 262        for (i = 0; i < arr_sz; i++)  {
 263                INIT_LIST_HEAD(&cmgr->free_list[i]);
 264                spin_lock_init(&cmgr->free_list_lock[i]);
 265        }
 266
 267        /*
 268         * Pre-allocated pool of bnx2fc_cmds.
 269         * Last entry in the free list array is the free list
 270         * of slow path requests.
 271         */
 272        xid = BNX2FC_MIN_XID;
 273        num_pri_ios = num_ios - hba->elstm_xids;
 274        for (i = 0; i < num_ios; i++) {
 275                io_req = kzalloc(sizeof(*io_req), GFP_KERNEL);
 276
 277                if (!io_req) {
 278                        printk(KERN_ERR PFX "failed to alloc io_req\n");
 279                        goto mem_err;
 280                }
 281
 282                INIT_LIST_HEAD(&io_req->link);
 283                INIT_DELAYED_WORK(&io_req->timeout_work, bnx2fc_cmd_timeout);
 284
 285                io_req->xid = xid++;
 286                if (i < num_pri_ios)
 287                        list_add_tail(&io_req->link,
 288                                &cmgr->free_list[io_req->xid %
 289                                                 num_possible_cpus()]);
 290                else
 291                        list_add_tail(&io_req->link,
 292                                &cmgr->free_list[num_possible_cpus()]);
 293                io_req++;
 294        }
 295
 296        /* Allocate pool of io_bdts - one for each bnx2fc_cmd */
 297        mem_size = num_ios * sizeof(struct io_bdt *);
 298        cmgr->io_bdt_pool = kzalloc(mem_size, GFP_KERNEL);
 299        if (!cmgr->io_bdt_pool) {
 300                printk(KERN_ERR PFX "failed to alloc io_bdt_pool\n");
 301                goto mem_err;
 302        }
 303
 304        mem_size = sizeof(struct io_bdt);
 305        for (i = 0; i < num_ios; i++) {
 306                cmgr->io_bdt_pool[i] = kmalloc(mem_size, GFP_KERNEL);
 307                if (!cmgr->io_bdt_pool[i]) {
 308                        printk(KERN_ERR PFX "failed to alloc "
 309                                "io_bdt_pool[%d]\n", i);
 310                        goto mem_err;
 311                }
 312        }
 313
 314        /* Allocate an map fcoe_bdt_ctx structures */
 315        bd_tbl_sz = BNX2FC_MAX_BDS_PER_CMD * sizeof(struct fcoe_bd_ctx);
 316        for (i = 0; i < num_ios; i++) {
 317                bdt_info = cmgr->io_bdt_pool[i];
 318                bdt_info->bd_tbl = dma_alloc_coherent(&hba->pcidev->dev,
 319                                                      bd_tbl_sz,
 320                                                      &bdt_info->bd_tbl_dma,
 321                                                      GFP_KERNEL);
 322                if (!bdt_info->bd_tbl) {
 323                        printk(KERN_ERR PFX "failed to alloc "
 324                                "bdt_tbl[%d]\n", i);
 325                        goto mem_err;
 326                }
 327        }
 328
 329        return cmgr;
 330
 331mem_err:
 332        bnx2fc_cmd_mgr_free(cmgr);
 333        return NULL;
 334}
 335
 336void bnx2fc_cmd_mgr_free(struct bnx2fc_cmd_mgr *cmgr)
 337{
 338        struct io_bdt *bdt_info;
 339        struct bnx2fc_hba *hba = cmgr->hba;
 340        size_t bd_tbl_sz;
 341        u16 min_xid = BNX2FC_MIN_XID;
 342        u16 max_xid = hba->max_xid;
 343        int num_ios;
 344        int i;
 345
 346        num_ios = max_xid - min_xid + 1;
 347
 348        /* Free fcoe_bdt_ctx structures */
 349        if (!cmgr->io_bdt_pool)
 350                goto free_cmd_pool;
 351
 352        bd_tbl_sz = BNX2FC_MAX_BDS_PER_CMD * sizeof(struct fcoe_bd_ctx);
 353        for (i = 0; i < num_ios; i++) {
 354                bdt_info = cmgr->io_bdt_pool[i];
 355                if (bdt_info->bd_tbl) {
 356                        dma_free_coherent(&hba->pcidev->dev, bd_tbl_sz,
 357                                            bdt_info->bd_tbl,
 358                                            bdt_info->bd_tbl_dma);
 359                        bdt_info->bd_tbl = NULL;
 360                }
 361        }
 362
 363        /* Destroy io_bdt pool */
 364        for (i = 0; i < num_ios; i++) {
 365                kfree(cmgr->io_bdt_pool[i]);
 366                cmgr->io_bdt_pool[i] = NULL;
 367        }
 368
 369        kfree(cmgr->io_bdt_pool);
 370        cmgr->io_bdt_pool = NULL;
 371
 372free_cmd_pool:
 373        kfree(cmgr->free_list_lock);
 374
 375        /* Destroy cmd pool */
 376        if (!cmgr->free_list)
 377                goto free_cmgr;
 378
 379        for (i = 0; i < num_possible_cpus() + 1; i++)  {
 380                struct bnx2fc_cmd *tmp, *io_req;
 381
 382                list_for_each_entry_safe(io_req, tmp,
 383                                         &cmgr->free_list[i], link) {
 384                        list_del(&io_req->link);
 385                        kfree(io_req);
 386                }
 387        }
 388        kfree(cmgr->free_list);
 389free_cmgr:
 390        /* Free command manager itself */
 391        kfree(cmgr);
 392}
 393
 394struct bnx2fc_cmd *bnx2fc_elstm_alloc(struct bnx2fc_rport *tgt, int type)
 395{
 396        struct fcoe_port *port = tgt->port;
 397        struct bnx2fc_interface *interface = port->priv;
 398        struct bnx2fc_cmd_mgr *cmd_mgr = interface->hba->cmd_mgr;
 399        struct bnx2fc_cmd *io_req;
 400        struct list_head *listp;
 401        struct io_bdt *bd_tbl;
 402        int index = RESERVE_FREE_LIST_INDEX;
 403        u32 free_sqes;
 404        u32 max_sqes;
 405        u16 xid;
 406
 407        max_sqes = tgt->max_sqes;
 408        switch (type) {
 409        case BNX2FC_TASK_MGMT_CMD:
 410                max_sqes = BNX2FC_TM_MAX_SQES;
 411                break;
 412        case BNX2FC_ELS:
 413                max_sqes = BNX2FC_ELS_MAX_SQES;
 414                break;
 415        default:
 416                break;
 417        }
 418
 419        /*
 420         * NOTE: Free list insertions and deletions are protected with
 421         * cmgr lock
 422         */
 423        spin_lock_bh(&cmd_mgr->free_list_lock[index]);
 424        free_sqes = atomic_read(&tgt->free_sqes);
 425        if ((list_empty(&(cmd_mgr->free_list[index]))) ||
 426            (tgt->num_active_ios.counter  >= max_sqes) ||
 427            (free_sqes + max_sqes <= BNX2FC_SQ_WQES_MAX)) {
 428                BNX2FC_TGT_DBG(tgt, "No free els_tm cmds available "
 429                        "ios(%d):sqes(%d)\n",
 430                        tgt->num_active_ios.counter, tgt->max_sqes);
 431                if (list_empty(&(cmd_mgr->free_list[index])))
 432                        printk(KERN_ERR PFX "elstm_alloc: list_empty\n");
 433                spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
 434                return NULL;
 435        }
 436
 437        listp = (struct list_head *)
 438                        cmd_mgr->free_list[index].next;
 439        list_del_init(listp);
 440        io_req = (struct bnx2fc_cmd *) listp;
 441        xid = io_req->xid;
 442        cmd_mgr->cmds[xid] = io_req;
 443        atomic_inc(&tgt->num_active_ios);
 444        atomic_dec(&tgt->free_sqes);
 445        spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
 446
 447        INIT_LIST_HEAD(&io_req->link);
 448
 449        io_req->port = port;
 450        io_req->cmd_mgr = cmd_mgr;
 451        io_req->req_flags = 0;
 452        io_req->cmd_type = type;
 453
 454        /* Bind io_bdt for this io_req */
 455        /* Have a static link between io_req and io_bdt_pool */
 456        bd_tbl = io_req->bd_tbl = cmd_mgr->io_bdt_pool[xid];
 457        bd_tbl->io_req = io_req;
 458
 459        /* Hold the io_req  against deletion */
 460        kref_init(&io_req->refcount);
 461        return io_req;
 462}
 463
 464struct bnx2fc_cmd *bnx2fc_cmd_alloc(struct bnx2fc_rport *tgt)
 465{
 466        struct fcoe_port *port = tgt->port;
 467        struct bnx2fc_interface *interface = port->priv;
 468        struct bnx2fc_cmd_mgr *cmd_mgr = interface->hba->cmd_mgr;
 469        struct bnx2fc_cmd *io_req;
 470        struct list_head *listp;
 471        struct io_bdt *bd_tbl;
 472        u32 free_sqes;
 473        u32 max_sqes;
 474        u16 xid;
 475        int index = get_cpu();
 476
 477        max_sqes = BNX2FC_SCSI_MAX_SQES;
 478        /*
 479         * NOTE: Free list insertions and deletions are protected with
 480         * cmgr lock
 481         */
 482        spin_lock_bh(&cmd_mgr->free_list_lock[index]);
 483        free_sqes = atomic_read(&tgt->free_sqes);
 484        if ((list_empty(&cmd_mgr->free_list[index])) ||
 485            (tgt->num_active_ios.counter  >= max_sqes) ||
 486            (free_sqes + max_sqes <= BNX2FC_SQ_WQES_MAX)) {
 487                spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
 488                put_cpu();
 489                return NULL;
 490        }
 491
 492        listp = (struct list_head *)
 493                cmd_mgr->free_list[index].next;
 494        list_del_init(listp);
 495        io_req = (struct bnx2fc_cmd *) listp;
 496        xid = io_req->xid;
 497        cmd_mgr->cmds[xid] = io_req;
 498        atomic_inc(&tgt->num_active_ios);
 499        atomic_dec(&tgt->free_sqes);
 500        spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
 501        put_cpu();
 502
 503        INIT_LIST_HEAD(&io_req->link);
 504
 505        io_req->port = port;
 506        io_req->cmd_mgr = cmd_mgr;
 507        io_req->req_flags = 0;
 508
 509        /* Bind io_bdt for this io_req */
 510        /* Have a static link between io_req and io_bdt_pool */
 511        bd_tbl = io_req->bd_tbl = cmd_mgr->io_bdt_pool[xid];
 512        bd_tbl->io_req = io_req;
 513
 514        /* Hold the io_req  against deletion */
 515        kref_init(&io_req->refcount);
 516        return io_req;
 517}
 518
 519void bnx2fc_cmd_release(struct kref *ref)
 520{
 521        struct bnx2fc_cmd *io_req = container_of(ref,
 522                                                struct bnx2fc_cmd, refcount);
 523        struct bnx2fc_cmd_mgr *cmd_mgr = io_req->cmd_mgr;
 524        int index;
 525
 526        if (io_req->cmd_type == BNX2FC_SCSI_CMD)
 527                index = io_req->xid % num_possible_cpus();
 528        else
 529                index = RESERVE_FREE_LIST_INDEX;
 530
 531
 532        spin_lock_bh(&cmd_mgr->free_list_lock[index]);
 533        if (io_req->cmd_type != BNX2FC_SCSI_CMD)
 534                bnx2fc_free_mp_resc(io_req);
 535        cmd_mgr->cmds[io_req->xid] = NULL;
 536        /* Delete IO from retire queue */
 537        list_del_init(&io_req->link);
 538        /* Add it to the free list */
 539        list_add(&io_req->link,
 540                        &cmd_mgr->free_list[index]);
 541        atomic_dec(&io_req->tgt->num_active_ios);
 542        spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
 543
 544}
 545
 546static void bnx2fc_free_mp_resc(struct bnx2fc_cmd *io_req)
 547{
 548        struct bnx2fc_mp_req *mp_req = &(io_req->mp_req);
 549        struct bnx2fc_interface *interface = io_req->port->priv;
 550        struct bnx2fc_hba *hba = interface->hba;
 551        size_t sz = sizeof(struct fcoe_bd_ctx);
 552
 553        /* clear tm flags */
 554        mp_req->tm_flags = 0;
 555        if (mp_req->mp_req_bd) {
 556                dma_free_coherent(&hba->pcidev->dev, sz,
 557                                     mp_req->mp_req_bd,
 558                                     mp_req->mp_req_bd_dma);
 559                mp_req->mp_req_bd = NULL;
 560        }
 561        if (mp_req->mp_resp_bd) {
 562                dma_free_coherent(&hba->pcidev->dev, sz,
 563                                     mp_req->mp_resp_bd,
 564                                     mp_req->mp_resp_bd_dma);
 565                mp_req->mp_resp_bd = NULL;
 566        }
 567        if (mp_req->req_buf) {
 568                dma_free_coherent(&hba->pcidev->dev, CNIC_PAGE_SIZE,
 569                                     mp_req->req_buf,
 570                                     mp_req->req_buf_dma);
 571                mp_req->req_buf = NULL;
 572        }
 573        if (mp_req->resp_buf) {
 574                dma_free_coherent(&hba->pcidev->dev, CNIC_PAGE_SIZE,
 575                                     mp_req->resp_buf,
 576                                     mp_req->resp_buf_dma);
 577                mp_req->resp_buf = NULL;
 578        }
 579}
 580
 581int bnx2fc_init_mp_req(struct bnx2fc_cmd *io_req)
 582{
 583        struct bnx2fc_mp_req *mp_req;
 584        struct fcoe_bd_ctx *mp_req_bd;
 585        struct fcoe_bd_ctx *mp_resp_bd;
 586        struct bnx2fc_interface *interface = io_req->port->priv;
 587        struct bnx2fc_hba *hba = interface->hba;
 588        dma_addr_t addr;
 589        size_t sz;
 590
 591        mp_req = (struct bnx2fc_mp_req *)&(io_req->mp_req);
 592        memset(mp_req, 0, sizeof(struct bnx2fc_mp_req));
 593
 594        if (io_req->cmd_type != BNX2FC_ELS) {
 595                mp_req->req_len = sizeof(struct fcp_cmnd);
 596                io_req->data_xfer_len = mp_req->req_len;
 597        } else
 598                mp_req->req_len = io_req->data_xfer_len;
 599
 600        mp_req->req_buf = dma_alloc_coherent(&hba->pcidev->dev, CNIC_PAGE_SIZE,
 601                                             &mp_req->req_buf_dma,
 602                                             GFP_ATOMIC);
 603        if (!mp_req->req_buf) {
 604                printk(KERN_ERR PFX "unable to alloc MP req buffer\n");
 605                bnx2fc_free_mp_resc(io_req);
 606                return FAILED;
 607        }
 608
 609        mp_req->resp_buf = dma_alloc_coherent(&hba->pcidev->dev, CNIC_PAGE_SIZE,
 610                                              &mp_req->resp_buf_dma,
 611                                              GFP_ATOMIC);
 612        if (!mp_req->resp_buf) {
 613                printk(KERN_ERR PFX "unable to alloc TM resp buffer\n");
 614                bnx2fc_free_mp_resc(io_req);
 615                return FAILED;
 616        }
 617        memset(mp_req->req_buf, 0, CNIC_PAGE_SIZE);
 618        memset(mp_req->resp_buf, 0, CNIC_PAGE_SIZE);
 619
 620        /* Allocate and map mp_req_bd and mp_resp_bd */
 621        sz = sizeof(struct fcoe_bd_ctx);
 622        mp_req->mp_req_bd = dma_alloc_coherent(&hba->pcidev->dev, sz,
 623                                                 &mp_req->mp_req_bd_dma,
 624                                                 GFP_ATOMIC);
 625        if (!mp_req->mp_req_bd) {
 626                printk(KERN_ERR PFX "unable to alloc MP req bd\n");
 627                bnx2fc_free_mp_resc(io_req);
 628                return FAILED;
 629        }
 630        mp_req->mp_resp_bd = dma_alloc_coherent(&hba->pcidev->dev, sz,
 631                                                 &mp_req->mp_resp_bd_dma,
 632                                                 GFP_ATOMIC);
 633        if (!mp_req->mp_resp_bd) {
 634                printk(KERN_ERR PFX "unable to alloc MP resp bd\n");
 635                bnx2fc_free_mp_resc(io_req);
 636                return FAILED;
 637        }
 638        /* Fill bd table */
 639        addr = mp_req->req_buf_dma;
 640        mp_req_bd = mp_req->mp_req_bd;
 641        mp_req_bd->buf_addr_lo = (u32)addr & 0xffffffff;
 642        mp_req_bd->buf_addr_hi = (u32)((u64)addr >> 32);
 643        mp_req_bd->buf_len = CNIC_PAGE_SIZE;
 644        mp_req_bd->flags = 0;
 645
 646        /*
 647         * MP buffer is either a task mgmt command or an ELS.
 648         * So the assumption is that it consumes a single bd
 649         * entry in the bd table
 650         */
 651        mp_resp_bd = mp_req->mp_resp_bd;
 652        addr = mp_req->resp_buf_dma;
 653        mp_resp_bd->buf_addr_lo = (u32)addr & 0xffffffff;
 654        mp_resp_bd->buf_addr_hi = (u32)((u64)addr >> 32);
 655        mp_resp_bd->buf_len = CNIC_PAGE_SIZE;
 656        mp_resp_bd->flags = 0;
 657
 658        return SUCCESS;
 659}
 660
 661static int bnx2fc_initiate_tmf(struct scsi_cmnd *sc_cmd, u8 tm_flags)
 662{
 663        struct fc_lport *lport;
 664        struct fc_rport *rport;
 665        struct fc_rport_libfc_priv *rp;
 666        struct fcoe_port *port;
 667        struct bnx2fc_interface *interface;
 668        struct bnx2fc_rport *tgt;
 669        struct bnx2fc_cmd *io_req;
 670        struct bnx2fc_mp_req *tm_req;
 671        struct fcoe_task_ctx_entry *task;
 672        struct fcoe_task_ctx_entry *task_page;
 673        struct Scsi_Host *host = sc_cmd->device->host;
 674        struct fc_frame_header *fc_hdr;
 675        struct fcp_cmnd *fcp_cmnd;
 676        int task_idx, index;
 677        int rc = SUCCESS;
 678        u16 xid;
 679        u32 sid, did;
 680        unsigned long start = jiffies;
 681
 682        lport = shost_priv(host);
 683        rport = starget_to_rport(scsi_target(sc_cmd->device));
 684        port = lport_priv(lport);
 685        interface = port->priv;
 686
 687        if (rport == NULL) {
 688                printk(KERN_ERR PFX "device_reset: rport is NULL\n");
 689                rc = FAILED;
 690                goto tmf_err;
 691        }
 692        rp = rport->dd_data;
 693
 694        rc = fc_block_scsi_eh(sc_cmd);
 695        if (rc)
 696                return rc;
 697
 698        if (lport->state != LPORT_ST_READY || !(lport->link_up)) {
 699                printk(KERN_ERR PFX "device_reset: link is not ready\n");
 700                rc = FAILED;
 701                goto tmf_err;
 702        }
 703        /* rport and tgt are allocated together, so tgt should be non-NULL */
 704        tgt = (struct bnx2fc_rport *)&rp[1];
 705
 706        if (!(test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags))) {
 707                printk(KERN_ERR PFX "device_reset: tgt not offloaded\n");
 708                rc = FAILED;
 709                goto tmf_err;
 710        }
 711retry_tmf:
 712        io_req = bnx2fc_elstm_alloc(tgt, BNX2FC_TASK_MGMT_CMD);
 713        if (!io_req) {
 714                if (time_after(jiffies, start + HZ)) {
 715                        printk(KERN_ERR PFX "tmf: Failed TMF");
 716                        rc = FAILED;
 717                        goto tmf_err;
 718                }
 719                msleep(20);
 720                goto retry_tmf;
 721        }
 722        /* Initialize rest of io_req fields */
 723        io_req->sc_cmd = sc_cmd;
 724        io_req->port = port;
 725        io_req->tgt = tgt;
 726
 727        tm_req = (struct bnx2fc_mp_req *)&(io_req->mp_req);
 728
 729        rc = bnx2fc_init_mp_req(io_req);
 730        if (rc == FAILED) {
 731                printk(KERN_ERR PFX "Task mgmt MP request init failed\n");
 732                spin_lock_bh(&tgt->tgt_lock);
 733                kref_put(&io_req->refcount, bnx2fc_cmd_release);
 734                spin_unlock_bh(&tgt->tgt_lock);
 735                goto tmf_err;
 736        }
 737
 738        /* Set TM flags */
 739        io_req->io_req_flags = 0;
 740        tm_req->tm_flags = tm_flags;
 741
 742        /* Fill FCP_CMND */
 743        bnx2fc_build_fcp_cmnd(io_req, (struct fcp_cmnd *)tm_req->req_buf);
 744        fcp_cmnd = (struct fcp_cmnd *)tm_req->req_buf;
 745        memset(fcp_cmnd->fc_cdb, 0,  sc_cmd->cmd_len);
 746        fcp_cmnd->fc_dl = 0;
 747
 748        /* Fill FC header */
 749        fc_hdr = &(tm_req->req_fc_hdr);
 750        sid = tgt->sid;
 751        did = rport->port_id;
 752        __fc_fill_fc_hdr(fc_hdr, FC_RCTL_DD_UNSOL_CMD, did, sid,
 753                           FC_TYPE_FCP, FC_FC_FIRST_SEQ | FC_FC_END_SEQ |
 754                           FC_FC_SEQ_INIT, 0);
 755        /* Obtain exchange id */
 756        xid = io_req->xid;
 757
 758        BNX2FC_TGT_DBG(tgt, "Initiate TMF - xid = 0x%x\n", xid);
 759        task_idx = xid/BNX2FC_TASKS_PER_PAGE;
 760        index = xid % BNX2FC_TASKS_PER_PAGE;
 761
 762        /* Initialize task context for this IO request */
 763        task_page = (struct fcoe_task_ctx_entry *)
 764                        interface->hba->task_ctx[task_idx];
 765        task = &(task_page[index]);
 766        bnx2fc_init_mp_task(io_req, task);
 767
 768        sc_cmd->SCp.ptr = (char *)io_req;
 769
 770        /* Obtain free SQ entry */
 771        spin_lock_bh(&tgt->tgt_lock);
 772        bnx2fc_add_2_sq(tgt, xid);
 773
 774        /* Enqueue the io_req to active_tm_queue */
 775        io_req->on_tmf_queue = 1;
 776        list_add_tail(&io_req->link, &tgt->active_tm_queue);
 777
 778        init_completion(&io_req->abts_done);
 779        io_req->wait_for_abts_comp = 1;
 780
 781        /* Ring doorbell */
 782        bnx2fc_ring_doorbell(tgt);
 783        spin_unlock_bh(&tgt->tgt_lock);
 784
 785        rc = wait_for_completion_timeout(&io_req->abts_done,
 786                                         interface->tm_timeout * HZ);
 787        spin_lock_bh(&tgt->tgt_lock);
 788
 789        io_req->wait_for_abts_comp = 0;
 790        if (!(test_bit(BNX2FC_FLAG_TM_COMPL, &io_req->req_flags))) {
 791                set_bit(BNX2FC_FLAG_TM_TIMEOUT, &io_req->req_flags);
 792                if (io_req->on_tmf_queue) {
 793                        list_del_init(&io_req->link);
 794                        io_req->on_tmf_queue = 0;
 795                }
 796                io_req->wait_for_cleanup_comp = 1;
 797                init_completion(&io_req->cleanup_done);
 798                bnx2fc_initiate_cleanup(io_req);
 799                spin_unlock_bh(&tgt->tgt_lock);
 800                rc = wait_for_completion_timeout(&io_req->cleanup_done,
 801                                                 BNX2FC_FW_TIMEOUT);
 802                spin_lock_bh(&tgt->tgt_lock);
 803                io_req->wait_for_cleanup_comp = 0;
 804                if (!rc)
 805                        kref_put(&io_req->refcount, bnx2fc_cmd_release);
 806        }
 807
 808        spin_unlock_bh(&tgt->tgt_lock);
 809
 810        if (!rc) {
 811                BNX2FC_TGT_DBG(tgt, "task mgmt command failed...\n");
 812                rc = FAILED;
 813        } else {
 814                BNX2FC_TGT_DBG(tgt, "task mgmt command success...\n");
 815                rc = SUCCESS;
 816        }
 817tmf_err:
 818        return rc;
 819}
 820
 821int bnx2fc_initiate_abts(struct bnx2fc_cmd *io_req)
 822{
 823        struct fc_lport *lport;
 824        struct bnx2fc_rport *tgt = io_req->tgt;
 825        struct fc_rport *rport = tgt->rport;
 826        struct fc_rport_priv *rdata = tgt->rdata;
 827        struct bnx2fc_interface *interface;
 828        struct fcoe_port *port;
 829        struct bnx2fc_cmd *abts_io_req;
 830        struct fcoe_task_ctx_entry *task;
 831        struct fcoe_task_ctx_entry *task_page;
 832        struct fc_frame_header *fc_hdr;
 833        struct bnx2fc_mp_req *abts_req;
 834        int task_idx, index;
 835        u32 sid, did;
 836        u16 xid;
 837        int rc = SUCCESS;
 838        u32 r_a_tov = rdata->r_a_tov;
 839
 840        /* called with tgt_lock held */
 841        BNX2FC_IO_DBG(io_req, "Entered bnx2fc_initiate_abts\n");
 842
 843        port = io_req->port;
 844        interface = port->priv;
 845        lport = port->lport;
 846
 847        if (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags)) {
 848                printk(KERN_ERR PFX "initiate_abts: tgt not offloaded\n");
 849                rc = FAILED;
 850                goto abts_err;
 851        }
 852
 853        if (rport == NULL) {
 854                printk(KERN_ERR PFX "initiate_abts: rport is NULL\n");
 855                rc = FAILED;
 856                goto abts_err;
 857        }
 858
 859        if (lport->state != LPORT_ST_READY || !(lport->link_up)) {
 860                printk(KERN_ERR PFX "initiate_abts: link is not ready\n");
 861                rc = FAILED;
 862                goto abts_err;
 863        }
 864
 865        abts_io_req = bnx2fc_elstm_alloc(tgt, BNX2FC_ABTS);
 866        if (!abts_io_req) {
 867                printk(KERN_ERR PFX "abts: couldnt allocate cmd\n");
 868                rc = FAILED;
 869                goto abts_err;
 870        }
 871
 872        /* Initialize rest of io_req fields */
 873        abts_io_req->sc_cmd = NULL;
 874        abts_io_req->port = port;
 875        abts_io_req->tgt = tgt;
 876        abts_io_req->data_xfer_len = 0; /* No data transfer for ABTS */
 877
 878        abts_req = (struct bnx2fc_mp_req *)&(abts_io_req->mp_req);
 879        memset(abts_req, 0, sizeof(struct bnx2fc_mp_req));
 880
 881        /* Fill FC header */
 882        fc_hdr = &(abts_req->req_fc_hdr);
 883
 884        /* Obtain oxid and rxid for the original exchange to be aborted */
 885        fc_hdr->fh_ox_id = htons(io_req->xid);
 886        fc_hdr->fh_rx_id = htons(io_req->task->rxwr_txrd.var_ctx.rx_id);
 887
 888        sid = tgt->sid;
 889        did = rport->port_id;
 890
 891        __fc_fill_fc_hdr(fc_hdr, FC_RCTL_BA_ABTS, did, sid,
 892                           FC_TYPE_BLS, FC_FC_FIRST_SEQ | FC_FC_END_SEQ |
 893                           FC_FC_SEQ_INIT, 0);
 894
 895        xid = abts_io_req->xid;
 896        BNX2FC_IO_DBG(abts_io_req, "ABTS io_req\n");
 897        task_idx = xid/BNX2FC_TASKS_PER_PAGE;
 898        index = xid % BNX2FC_TASKS_PER_PAGE;
 899
 900        /* Initialize task context for this IO request */
 901        task_page = (struct fcoe_task_ctx_entry *)
 902                        interface->hba->task_ctx[task_idx];
 903        task = &(task_page[index]);
 904        bnx2fc_init_mp_task(abts_io_req, task);
 905
 906        /*
 907         * ABTS task is a temporary task that will be cleaned up
 908         * irrespective of ABTS response. We need to start the timer
 909         * for the original exchange, as the CQE is posted for the original
 910         * IO request.
 911         *
 912         * Timer for ABTS is started only when it is originated by a
 913         * TM request. For the ABTS issued as part of ULP timeout,
 914         * scsi-ml maintains the timers.
 915         */
 916
 917        /* if (test_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags))*/
 918        bnx2fc_cmd_timer_set(io_req, 2 * r_a_tov);
 919
 920        /* Obtain free SQ entry */
 921        bnx2fc_add_2_sq(tgt, xid);
 922
 923        /* Ring doorbell */
 924        bnx2fc_ring_doorbell(tgt);
 925
 926abts_err:
 927        return rc;
 928}
 929
 930int bnx2fc_initiate_seq_cleanup(struct bnx2fc_cmd *orig_io_req, u32 offset,
 931                                enum fc_rctl r_ctl)
 932{
 933        struct bnx2fc_rport *tgt = orig_io_req->tgt;
 934        struct bnx2fc_interface *interface;
 935        struct fcoe_port *port;
 936        struct bnx2fc_cmd *seq_clnp_req;
 937        struct fcoe_task_ctx_entry *task;
 938        struct fcoe_task_ctx_entry *task_page;
 939        struct bnx2fc_els_cb_arg *cb_arg = NULL;
 940        int task_idx, index;
 941        u16 xid;
 942        int rc = 0;
 943
 944        BNX2FC_IO_DBG(orig_io_req, "bnx2fc_initiate_seq_cleanup xid = 0x%x\n",
 945                   orig_io_req->xid);
 946        kref_get(&orig_io_req->refcount);
 947
 948        port = orig_io_req->port;
 949        interface = port->priv;
 950
 951        cb_arg = kzalloc(sizeof(struct bnx2fc_els_cb_arg), GFP_ATOMIC);
 952        if (!cb_arg) {
 953                printk(KERN_ERR PFX "Unable to alloc cb_arg for seq clnup\n");
 954                rc = -ENOMEM;
 955                goto cleanup_err;
 956        }
 957
 958        seq_clnp_req = bnx2fc_elstm_alloc(tgt, BNX2FC_SEQ_CLEANUP);
 959        if (!seq_clnp_req) {
 960                printk(KERN_ERR PFX "cleanup: couldnt allocate cmd\n");
 961                rc = -ENOMEM;
 962                kfree(cb_arg);
 963                goto cleanup_err;
 964        }
 965        /* Initialize rest of io_req fields */
 966        seq_clnp_req->sc_cmd = NULL;
 967        seq_clnp_req->port = port;
 968        seq_clnp_req->tgt = tgt;
 969        seq_clnp_req->data_xfer_len = 0; /* No data transfer for cleanup */
 970
 971        xid = seq_clnp_req->xid;
 972
 973        task_idx = xid/BNX2FC_TASKS_PER_PAGE;
 974        index = xid % BNX2FC_TASKS_PER_PAGE;
 975
 976        /* Initialize task context for this IO request */
 977        task_page = (struct fcoe_task_ctx_entry *)
 978                     interface->hba->task_ctx[task_idx];
 979        task = &(task_page[index]);
 980        cb_arg->aborted_io_req = orig_io_req;
 981        cb_arg->io_req = seq_clnp_req;
 982        cb_arg->r_ctl = r_ctl;
 983        cb_arg->offset = offset;
 984        seq_clnp_req->cb_arg = cb_arg;
 985
 986        printk(KERN_ERR PFX "call init_seq_cleanup_task\n");
 987        bnx2fc_init_seq_cleanup_task(seq_clnp_req, task, orig_io_req, offset);
 988
 989        /* Obtain free SQ entry */
 990        bnx2fc_add_2_sq(tgt, xid);
 991
 992        /* Ring doorbell */
 993        bnx2fc_ring_doorbell(tgt);
 994cleanup_err:
 995        return rc;
 996}
 997
 998int bnx2fc_initiate_cleanup(struct bnx2fc_cmd *io_req)
 999{
1000        struct bnx2fc_rport *tgt = io_req->tgt;
1001        struct bnx2fc_interface *interface;
1002        struct fcoe_port *port;
1003        struct bnx2fc_cmd *cleanup_io_req;
1004        struct fcoe_task_ctx_entry *task;
1005        struct fcoe_task_ctx_entry *task_page;
1006        int task_idx, index;
1007        u16 xid, orig_xid;
1008        int rc = 0;
1009
1010        /* ASSUMPTION: called with tgt_lock held */
1011        BNX2FC_IO_DBG(io_req, "Entered bnx2fc_initiate_cleanup\n");
1012
1013        port = io_req->port;
1014        interface = port->priv;
1015
1016        cleanup_io_req = bnx2fc_elstm_alloc(tgt, BNX2FC_CLEANUP);
1017        if (!cleanup_io_req) {
1018                printk(KERN_ERR PFX "cleanup: couldnt allocate cmd\n");
1019                rc = -1;
1020                goto cleanup_err;
1021        }
1022
1023        /* Initialize rest of io_req fields */
1024        cleanup_io_req->sc_cmd = NULL;
1025        cleanup_io_req->port = port;
1026        cleanup_io_req->tgt = tgt;
1027        cleanup_io_req->data_xfer_len = 0; /* No data transfer for cleanup */
1028
1029        xid = cleanup_io_req->xid;
1030
1031        task_idx = xid/BNX2FC_TASKS_PER_PAGE;
1032        index = xid % BNX2FC_TASKS_PER_PAGE;
1033
1034        /* Initialize task context for this IO request */
1035        task_page = (struct fcoe_task_ctx_entry *)
1036                        interface->hba->task_ctx[task_idx];
1037        task = &(task_page[index]);
1038        orig_xid = io_req->xid;
1039
1040        BNX2FC_IO_DBG(io_req, "CLEANUP io_req xid = 0x%x\n", xid);
1041
1042        bnx2fc_init_cleanup_task(cleanup_io_req, task, orig_xid);
1043
1044        /* Obtain free SQ entry */
1045        bnx2fc_add_2_sq(tgt, xid);
1046
1047        /* Set flag that cleanup request is pending with the firmware */
1048        set_bit(BNX2FC_FLAG_ISSUE_CLEANUP_REQ, &io_req->req_flags);
1049
1050        /* Ring doorbell */
1051        bnx2fc_ring_doorbell(tgt);
1052
1053cleanup_err:
1054        return rc;
1055}
1056
1057/**
1058 * bnx2fc_eh_target_reset: Reset a target
1059 *
1060 * @sc_cmd:     SCSI command
1061 *
1062 * Set from SCSI host template to send task mgmt command to the target
1063 *      and wait for the response
1064 */
1065int bnx2fc_eh_target_reset(struct scsi_cmnd *sc_cmd)
1066{
1067        return bnx2fc_initiate_tmf(sc_cmd, FCP_TMF_TGT_RESET);
1068}
1069
1070/**
1071 * bnx2fc_eh_device_reset - Reset a single LUN
1072 *
1073 * @sc_cmd:     SCSI command
1074 *
1075 * Set from SCSI host template to send task mgmt command to the target
1076 *      and wait for the response
1077 */
1078int bnx2fc_eh_device_reset(struct scsi_cmnd *sc_cmd)
1079{
1080        return bnx2fc_initiate_tmf(sc_cmd, FCP_TMF_LUN_RESET);
1081}
1082
1083static int bnx2fc_abts_cleanup(struct bnx2fc_cmd *io_req)
1084{
1085        struct bnx2fc_rport *tgt = io_req->tgt;
1086        unsigned int time_left;
1087
1088        init_completion(&io_req->cleanup_done);
1089        io_req->wait_for_cleanup_comp = 1;
1090        bnx2fc_initiate_cleanup(io_req);
1091
1092        spin_unlock_bh(&tgt->tgt_lock);
1093
1094        /*
1095         * Can't wait forever on cleanup response lest we let the SCSI error
1096         * handler wait forever
1097         */
1098        time_left = wait_for_completion_timeout(&io_req->cleanup_done,
1099                                                BNX2FC_FW_TIMEOUT);
1100        if (!time_left) {
1101                BNX2FC_IO_DBG(io_req, "%s(): Wait for cleanup timed out.\n",
1102                              __func__);
1103
1104                /*
1105                 * Put the extra reference to the SCSI command since it would
1106                 * not have been returned in this case.
1107                 */
1108                kref_put(&io_req->refcount, bnx2fc_cmd_release);
1109        }
1110
1111        spin_lock_bh(&tgt->tgt_lock);
1112        io_req->wait_for_cleanup_comp = 0;
1113        return SUCCESS;
1114}
1115
1116/**
1117 * bnx2fc_eh_abort - eh_abort_handler api to abort an outstanding
1118 *                      SCSI command
1119 *
1120 * @sc_cmd:     SCSI_ML command pointer
1121 *
1122 * SCSI abort request handler
1123 */
1124int bnx2fc_eh_abort(struct scsi_cmnd *sc_cmd)
1125{
1126        struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
1127        struct fc_rport_libfc_priv *rp = rport->dd_data;
1128        struct bnx2fc_cmd *io_req;
1129        struct fc_lport *lport;
1130        struct bnx2fc_rport *tgt;
1131        int rc;
1132        unsigned int time_left;
1133
1134        rc = fc_block_scsi_eh(sc_cmd);
1135        if (rc)
1136                return rc;
1137
1138        lport = shost_priv(sc_cmd->device->host);
1139        if ((lport->state != LPORT_ST_READY) || !(lport->link_up)) {
1140                printk(KERN_ERR PFX "eh_abort: link not ready\n");
1141                return FAILED;
1142        }
1143
1144        tgt = (struct bnx2fc_rport *)&rp[1];
1145
1146        BNX2FC_TGT_DBG(tgt, "Entered bnx2fc_eh_abort\n");
1147
1148        spin_lock_bh(&tgt->tgt_lock);
1149        io_req = (struct bnx2fc_cmd *)sc_cmd->SCp.ptr;
1150        if (!io_req) {
1151                /* Command might have just completed */
1152                printk(KERN_ERR PFX "eh_abort: io_req is NULL\n");
1153                spin_unlock_bh(&tgt->tgt_lock);
1154                return SUCCESS;
1155        }
1156        BNX2FC_IO_DBG(io_req, "eh_abort - refcnt = %d\n",
1157                      kref_read(&io_req->refcount));
1158
1159        /* Hold IO request across abort processing */
1160        kref_get(&io_req->refcount);
1161
1162        BUG_ON(tgt != io_req->tgt);
1163
1164        /* Remove the io_req from the active_q. */
1165        /*
1166         * Task Mgmt functions (LUN RESET & TGT RESET) will not
1167         * issue an ABTS on this particular IO req, as the
1168         * io_req is no longer in the active_q.
1169         */
1170        if (tgt->flush_in_prog) {
1171                printk(KERN_ERR PFX "eh_abort: io_req (xid = 0x%x) "
1172                        "flush in progress\n", io_req->xid);
1173                kref_put(&io_req->refcount, bnx2fc_cmd_release);
1174                spin_unlock_bh(&tgt->tgt_lock);
1175                return SUCCESS;
1176        }
1177
1178        if (io_req->on_active_queue == 0) {
1179                printk(KERN_ERR PFX "eh_abort: io_req (xid = 0x%x) "
1180                                "not on active_q\n", io_req->xid);
1181                /*
1182                 * The IO is still with the FW.
1183                 * Return failure and let SCSI-ml retry eh_abort.
1184                 */
1185                spin_unlock_bh(&tgt->tgt_lock);
1186                return FAILED;
1187        }
1188
1189        /*
1190         * Only eh_abort processing will remove the IO from
1191         * active_cmd_q before processing the request. this is
1192         * done to avoid race conditions between IOs aborted
1193         * as part of task management completion and eh_abort
1194         * processing
1195         */
1196        list_del_init(&io_req->link);
1197        io_req->on_active_queue = 0;
1198        /* Move IO req to retire queue */
1199        list_add_tail(&io_req->link, &tgt->io_retire_queue);
1200
1201        init_completion(&io_req->abts_done);
1202        init_completion(&io_req->cleanup_done);
1203
1204        if (test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags)) {
1205                printk(KERN_ERR PFX "eh_abort: io_req (xid = 0x%x) "
1206                                "already in abts processing\n", io_req->xid);
1207                if (cancel_delayed_work(&io_req->timeout_work))
1208                        kref_put(&io_req->refcount,
1209                                 bnx2fc_cmd_release); /* drop timer hold */
1210                /*
1211                 * We don't want to hold off the upper layer timer so simply
1212                 * cleanup the command and return that I/O was successfully
1213                 * aborted.
1214                 */
1215                rc = bnx2fc_abts_cleanup(io_req);
1216                /* This only occurs when an task abort was requested while ABTS
1217                   is in progress.  Setting the IO_CLEANUP flag will skip the
1218                   RRQ process in the case when the fw generated SCSI_CMD cmpl
1219                   was a result from the ABTS request rather than the CLEANUP
1220                   request */
1221                set_bit(BNX2FC_FLAG_IO_CLEANUP, &io_req->req_flags);
1222                goto done;
1223        }
1224
1225        /* Cancel the current timer running on this io_req */
1226        if (cancel_delayed_work(&io_req->timeout_work))
1227                kref_put(&io_req->refcount,
1228                         bnx2fc_cmd_release); /* drop timer hold */
1229        set_bit(BNX2FC_FLAG_EH_ABORT, &io_req->req_flags);
1230        io_req->wait_for_abts_comp = 1;
1231        rc = bnx2fc_initiate_abts(io_req);
1232        if (rc == FAILED) {
1233                io_req->wait_for_cleanup_comp = 1;
1234                bnx2fc_initiate_cleanup(io_req);
1235                spin_unlock_bh(&tgt->tgt_lock);
1236                wait_for_completion(&io_req->cleanup_done);
1237                spin_lock_bh(&tgt->tgt_lock);
1238                io_req->wait_for_cleanup_comp = 0;
1239                goto done;
1240        }
1241        spin_unlock_bh(&tgt->tgt_lock);
1242
1243        /* Wait 2 * RA_TOV + 1 to be sure timeout function hasn't fired */
1244        time_left = wait_for_completion_timeout(&io_req->abts_done,
1245                                        msecs_to_jiffies(2 * rp->r_a_tov + 1));
1246        if (time_left)
1247                BNX2FC_IO_DBG(io_req,
1248                              "Timed out in eh_abort waiting for abts_done");
1249
1250        spin_lock_bh(&tgt->tgt_lock);
1251        io_req->wait_for_abts_comp = 0;
1252        if (test_bit(BNX2FC_FLAG_IO_COMPL, &io_req->req_flags)) {
1253                BNX2FC_IO_DBG(io_req, "IO completed in a different context\n");
1254                rc = SUCCESS;
1255        } else if (!(test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
1256                                      &io_req->req_flags))) {
1257                /* Let the scsi-ml try to recover this command */
1258                printk(KERN_ERR PFX "abort failed, xid = 0x%x\n",
1259                       io_req->xid);
1260                /*
1261                 * Cleanup firmware residuals before returning control back
1262                 * to SCSI ML.
1263                 */
1264                rc = bnx2fc_abts_cleanup(io_req);
1265                goto done;
1266        } else {
1267                /*
1268                 * We come here even when there was a race condition
1269                 * between timeout and abts completion, and abts
1270                 * completion happens just in time.
1271                 */
1272                BNX2FC_IO_DBG(io_req, "abort succeeded\n");
1273                rc = SUCCESS;
1274                bnx2fc_scsi_done(io_req, DID_ABORT);
1275                kref_put(&io_req->refcount, bnx2fc_cmd_release);
1276        }
1277done:
1278        /* release the reference taken in eh_abort */
1279        kref_put(&io_req->refcount, bnx2fc_cmd_release);
1280        spin_unlock_bh(&tgt->tgt_lock);
1281        return rc;
1282}
1283
1284void bnx2fc_process_seq_cleanup_compl(struct bnx2fc_cmd *seq_clnp_req,
1285                                      struct fcoe_task_ctx_entry *task,
1286                                      u8 rx_state)
1287{
1288        struct bnx2fc_els_cb_arg *cb_arg = seq_clnp_req->cb_arg;
1289        struct bnx2fc_cmd *orig_io_req = cb_arg->aborted_io_req;
1290        u32 offset = cb_arg->offset;
1291        enum fc_rctl r_ctl = cb_arg->r_ctl;
1292        int rc = 0;
1293        struct bnx2fc_rport *tgt = orig_io_req->tgt;
1294
1295        BNX2FC_IO_DBG(orig_io_req, "Entered process_cleanup_compl xid = 0x%x"
1296                              "cmd_type = %d\n",
1297                   seq_clnp_req->xid, seq_clnp_req->cmd_type);
1298
1299        if (rx_state == FCOE_TASK_RX_STATE_IGNORED_SEQUENCE_CLEANUP) {
1300                printk(KERN_ERR PFX "seq cleanup ignored - xid = 0x%x\n",
1301                        seq_clnp_req->xid);
1302                goto free_cb_arg;
1303        }
1304
1305        spin_unlock_bh(&tgt->tgt_lock);
1306        rc = bnx2fc_send_srr(orig_io_req, offset, r_ctl);
1307        spin_lock_bh(&tgt->tgt_lock);
1308
1309        if (rc)
1310                printk(KERN_ERR PFX "clnup_compl: Unable to send SRR"
1311                        " IO will abort\n");
1312        seq_clnp_req->cb_arg = NULL;
1313        kref_put(&orig_io_req->refcount, bnx2fc_cmd_release);
1314free_cb_arg:
1315        kfree(cb_arg);
1316        return;
1317}
1318
1319void bnx2fc_process_cleanup_compl(struct bnx2fc_cmd *io_req,
1320                                  struct fcoe_task_ctx_entry *task,
1321                                  u8 num_rq)
1322{
1323        BNX2FC_IO_DBG(io_req, "Entered process_cleanup_compl "
1324                              "refcnt = %d, cmd_type = %d\n",
1325                   kref_read(&io_req->refcount), io_req->cmd_type);
1326        /*
1327         * Test whether there is a cleanup request pending. If not just
1328         * exit.
1329         */
1330        if (!test_and_clear_bit(BNX2FC_FLAG_ISSUE_CLEANUP_REQ,
1331                                &io_req->req_flags))
1332                return;
1333        /*
1334         * If we receive a cleanup completion for this request then the
1335         * firmware will not give us an abort completion for this request
1336         * so clear any ABTS pending flags.
1337         */
1338        if (test_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags) &&
1339            !test_bit(BNX2FC_FLAG_ABTS_DONE, &io_req->req_flags)) {
1340                set_bit(BNX2FC_FLAG_ABTS_DONE, &io_req->req_flags);
1341                if (io_req->wait_for_abts_comp)
1342                        complete(&io_req->abts_done);
1343        }
1344
1345        bnx2fc_scsi_done(io_req, DID_ERROR);
1346        kref_put(&io_req->refcount, bnx2fc_cmd_release);
1347        if (io_req->wait_for_cleanup_comp)
1348                complete(&io_req->cleanup_done);
1349}
1350
1351void bnx2fc_process_abts_compl(struct bnx2fc_cmd *io_req,
1352                               struct fcoe_task_ctx_entry *task,
1353                               u8 num_rq)
1354{
1355        u32 r_ctl;
1356        u32 r_a_tov = FC_DEF_R_A_TOV;
1357        u8 issue_rrq = 0;
1358        struct bnx2fc_rport *tgt = io_req->tgt;
1359
1360        BNX2FC_IO_DBG(io_req, "Entered process_abts_compl xid = 0x%x"
1361                              "refcnt = %d, cmd_type = %d\n",
1362                   io_req->xid,
1363                   kref_read(&io_req->refcount), io_req->cmd_type);
1364
1365        if (test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
1366                                       &io_req->req_flags)) {
1367                BNX2FC_IO_DBG(io_req, "Timer context finished processing"
1368                                " this io\n");
1369                return;
1370        }
1371
1372        /*
1373         * If we receive an ABTS completion here then we will not receive
1374         * a cleanup completion so clear any cleanup pending flags.
1375         */
1376        if (test_bit(BNX2FC_FLAG_ISSUE_CLEANUP_REQ, &io_req->req_flags)) {
1377                clear_bit(BNX2FC_FLAG_ISSUE_CLEANUP_REQ, &io_req->req_flags);
1378                if (io_req->wait_for_cleanup_comp)
1379                        complete(&io_req->cleanup_done);
1380        }
1381
1382        /* Do not issue RRQ as this IO is already cleanedup */
1383        if (test_and_set_bit(BNX2FC_FLAG_IO_CLEANUP,
1384                                &io_req->req_flags))
1385                goto io_compl;
1386
1387        /*
1388         * For ABTS issued due to SCSI eh_abort_handler, timeout
1389         * values are maintained by scsi-ml itself. Cancel timeout
1390         * in case ABTS issued as part of task management function
1391         * or due to FW error.
1392         */
1393        if (test_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags))
1394                if (cancel_delayed_work(&io_req->timeout_work))
1395                        kref_put(&io_req->refcount,
1396                                 bnx2fc_cmd_release); /* drop timer hold */
1397
1398        r_ctl = (u8)task->rxwr_only.union_ctx.comp_info.abts_rsp.r_ctl;
1399
1400        switch (r_ctl) {
1401        case FC_RCTL_BA_ACC:
1402                /*
1403                 * Dont release this cmd yet. It will be relesed
1404                 * after we get RRQ response
1405                 */
1406                BNX2FC_IO_DBG(io_req, "ABTS response - ACC Send RRQ\n");
1407                issue_rrq = 1;
1408                break;
1409
1410        case FC_RCTL_BA_RJT:
1411                BNX2FC_IO_DBG(io_req, "ABTS response - RJT\n");
1412                break;
1413        default:
1414                printk(KERN_ERR PFX "Unknown ABTS response\n");
1415                break;
1416        }
1417
1418        if (issue_rrq) {
1419                BNX2FC_IO_DBG(io_req, "Issue RRQ after R_A_TOV\n");
1420                set_bit(BNX2FC_FLAG_ISSUE_RRQ, &io_req->req_flags);
1421        }
1422        set_bit(BNX2FC_FLAG_RETIRE_OXID, &io_req->req_flags);
1423        bnx2fc_cmd_timer_set(io_req, r_a_tov);
1424
1425io_compl:
1426        if (io_req->wait_for_abts_comp) {
1427                if (test_and_clear_bit(BNX2FC_FLAG_EH_ABORT,
1428                                       &io_req->req_flags))
1429                        complete(&io_req->abts_done);
1430        } else {
1431                /*
1432                 * We end up here when ABTS is issued as
1433                 * in asynchronous context, i.e., as part
1434                 * of task management completion, or
1435                 * when FW error is received or when the
1436                 * ABTS is issued when the IO is timed
1437                 * out.
1438                 */
1439
1440                if (io_req->on_active_queue) {
1441                        list_del_init(&io_req->link);
1442                        io_req->on_active_queue = 0;
1443                        /* Move IO req to retire queue */
1444                        list_add_tail(&io_req->link, &tgt->io_retire_queue);
1445                }
1446                bnx2fc_scsi_done(io_req, DID_ERROR);
1447                kref_put(&io_req->refcount, bnx2fc_cmd_release);
1448        }
1449}
1450
1451static void bnx2fc_lun_reset_cmpl(struct bnx2fc_cmd *io_req)
1452{
1453        struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1454        struct bnx2fc_rport *tgt = io_req->tgt;
1455        struct bnx2fc_cmd *cmd, *tmp;
1456        u64 tm_lun = sc_cmd->device->lun;
1457        u64 lun;
1458        int rc = 0;
1459
1460        /* called with tgt_lock held */
1461        BNX2FC_IO_DBG(io_req, "Entered bnx2fc_lun_reset_cmpl\n");
1462        /*
1463         * Walk thru the active_ios queue and ABORT the IO
1464         * that matches with the LUN that was reset
1465         */
1466        list_for_each_entry_safe(cmd, tmp, &tgt->active_cmd_queue, link) {
1467                BNX2FC_TGT_DBG(tgt, "LUN RST cmpl: scan for pending IOs\n");
1468                lun = cmd->sc_cmd->device->lun;
1469                if (lun == tm_lun) {
1470                        /* Initiate ABTS on this cmd */
1471                        if (!test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS,
1472                                              &cmd->req_flags)) {
1473                                /* cancel the IO timeout */
1474                                if (cancel_delayed_work(&io_req->timeout_work))
1475                                        kref_put(&io_req->refcount,
1476                                                 bnx2fc_cmd_release);
1477                                                        /* timer hold */
1478                                rc = bnx2fc_initiate_abts(cmd);
1479                                /* abts shouldn't fail in this context */
1480                                WARN_ON(rc != SUCCESS);
1481                        } else
1482                                printk(KERN_ERR PFX "lun_rst: abts already in"
1483                                        " progress for this IO 0x%x\n",
1484                                        cmd->xid);
1485                }
1486        }
1487}
1488
1489static void bnx2fc_tgt_reset_cmpl(struct bnx2fc_cmd *io_req)
1490{
1491        struct bnx2fc_rport *tgt = io_req->tgt;
1492        struct bnx2fc_cmd *cmd, *tmp;
1493        int rc = 0;
1494
1495        /* called with tgt_lock held */
1496        BNX2FC_IO_DBG(io_req, "Entered bnx2fc_tgt_reset_cmpl\n");
1497        /*
1498         * Walk thru the active_ios queue and ABORT the IO
1499         * that matches with the LUN that was reset
1500         */
1501        list_for_each_entry_safe(cmd, tmp, &tgt->active_cmd_queue, link) {
1502                BNX2FC_TGT_DBG(tgt, "TGT RST cmpl: scan for pending IOs\n");
1503                /* Initiate ABTS */
1504                if (!test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS,
1505                                                        &cmd->req_flags)) {
1506                        /* cancel the IO timeout */
1507                        if (cancel_delayed_work(&io_req->timeout_work))
1508                                kref_put(&io_req->refcount,
1509                                         bnx2fc_cmd_release); /* timer hold */
1510                        rc = bnx2fc_initiate_abts(cmd);
1511                        /* abts shouldn't fail in this context */
1512                        WARN_ON(rc != SUCCESS);
1513
1514                } else
1515                        printk(KERN_ERR PFX "tgt_rst: abts already in progress"
1516                                " for this IO 0x%x\n", cmd->xid);
1517        }
1518}
1519
1520void bnx2fc_process_tm_compl(struct bnx2fc_cmd *io_req,
1521                             struct fcoe_task_ctx_entry *task, u8 num_rq)
1522{
1523        struct bnx2fc_mp_req *tm_req;
1524        struct fc_frame_header *fc_hdr;
1525        struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1526        u64 *hdr;
1527        u64 *temp_hdr;
1528        void *rsp_buf;
1529
1530        /* Called with tgt_lock held */
1531        BNX2FC_IO_DBG(io_req, "Entered process_tm_compl\n");
1532
1533        if (!(test_bit(BNX2FC_FLAG_TM_TIMEOUT, &io_req->req_flags)))
1534                set_bit(BNX2FC_FLAG_TM_COMPL, &io_req->req_flags);
1535        else {
1536                /* TM has already timed out and we got
1537                 * delayed completion. Ignore completion
1538                 * processing.
1539                 */
1540                return;
1541        }
1542
1543        tm_req = &(io_req->mp_req);
1544        fc_hdr = &(tm_req->resp_fc_hdr);
1545        hdr = (u64 *)fc_hdr;
1546        temp_hdr = (u64 *)
1547                &task->rxwr_only.union_ctx.comp_info.mp_rsp.fc_hdr;
1548        hdr[0] = cpu_to_be64(temp_hdr[0]);
1549        hdr[1] = cpu_to_be64(temp_hdr[1]);
1550        hdr[2] = cpu_to_be64(temp_hdr[2]);
1551
1552        tm_req->resp_len =
1553                task->rxwr_only.union_ctx.comp_info.mp_rsp.mp_payload_len;
1554
1555        rsp_buf = tm_req->resp_buf;
1556
1557        if (fc_hdr->fh_r_ctl == FC_RCTL_DD_CMD_STATUS) {
1558                bnx2fc_parse_fcp_rsp(io_req,
1559                                     (struct fcoe_fcp_rsp_payload *)
1560                                     rsp_buf, num_rq);
1561                if (io_req->fcp_rsp_code == 0) {
1562                        /* TM successful */
1563                        if (tm_req->tm_flags & FCP_TMF_LUN_RESET)
1564                                bnx2fc_lun_reset_cmpl(io_req);
1565                        else if (tm_req->tm_flags & FCP_TMF_TGT_RESET)
1566                                bnx2fc_tgt_reset_cmpl(io_req);
1567                }
1568        } else {
1569                printk(KERN_ERR PFX "tmf's fc_hdr r_ctl = 0x%x\n",
1570                        fc_hdr->fh_r_ctl);
1571        }
1572        if (!sc_cmd->SCp.ptr) {
1573                printk(KERN_ERR PFX "tm_compl: SCp.ptr is NULL\n");
1574                return;
1575        }
1576        switch (io_req->fcp_status) {
1577        case FC_GOOD:
1578                if (io_req->cdb_status == 0) {
1579                        /* Good IO completion */
1580                        sc_cmd->result = DID_OK << 16;
1581                } else {
1582                        /* Transport status is good, SCSI status not good */
1583                        sc_cmd->result = (DID_OK << 16) | io_req->cdb_status;
1584                }
1585                if (io_req->fcp_resid)
1586                        scsi_set_resid(sc_cmd, io_req->fcp_resid);
1587                break;
1588
1589        default:
1590                BNX2FC_IO_DBG(io_req, "process_tm_compl: fcp_status = %d\n",
1591                           io_req->fcp_status);
1592                break;
1593        }
1594
1595        sc_cmd = io_req->sc_cmd;
1596        io_req->sc_cmd = NULL;
1597
1598        /* check if the io_req exists in tgt's tmf_q */
1599        if (io_req->on_tmf_queue) {
1600
1601                list_del_init(&io_req->link);
1602                io_req->on_tmf_queue = 0;
1603        } else {
1604
1605                printk(KERN_ERR PFX "Command not on active_cmd_queue!\n");
1606                return;
1607        }
1608
1609        sc_cmd->SCp.ptr = NULL;
1610        sc_cmd->scsi_done(sc_cmd);
1611
1612        kref_put(&io_req->refcount, bnx2fc_cmd_release);
1613        if (io_req->wait_for_abts_comp) {
1614                BNX2FC_IO_DBG(io_req, "tm_compl - wake up the waiter\n");
1615                complete(&io_req->abts_done);
1616        }
1617}
1618
1619static int bnx2fc_split_bd(struct bnx2fc_cmd *io_req, u64 addr, int sg_len,
1620                           int bd_index)
1621{
1622        struct fcoe_bd_ctx *bd = io_req->bd_tbl->bd_tbl;
1623        int frag_size, sg_frags;
1624
1625        sg_frags = 0;
1626        while (sg_len) {
1627                if (sg_len >= BNX2FC_BD_SPLIT_SZ)
1628                        frag_size = BNX2FC_BD_SPLIT_SZ;
1629                else
1630                        frag_size = sg_len;
1631                bd[bd_index + sg_frags].buf_addr_lo = addr & 0xffffffff;
1632                bd[bd_index + sg_frags].buf_addr_hi  = addr >> 32;
1633                bd[bd_index + sg_frags].buf_len = (u16)frag_size;
1634                bd[bd_index + sg_frags].flags = 0;
1635
1636                addr += (u64) frag_size;
1637                sg_frags++;
1638                sg_len -= frag_size;
1639        }
1640        return sg_frags;
1641
1642}
1643
1644static int bnx2fc_map_sg(struct bnx2fc_cmd *io_req)
1645{
1646        struct bnx2fc_interface *interface = io_req->port->priv;
1647        struct bnx2fc_hba *hba = interface->hba;
1648        struct scsi_cmnd *sc = io_req->sc_cmd;
1649        struct fcoe_bd_ctx *bd = io_req->bd_tbl->bd_tbl;
1650        struct scatterlist *sg;
1651        int byte_count = 0;
1652        int sg_count = 0;
1653        int bd_count = 0;
1654        int sg_frags;
1655        unsigned int sg_len;
1656        u64 addr;
1657        int i;
1658
1659        WARN_ON(scsi_sg_count(sc) > BNX2FC_MAX_BDS_PER_CMD);
1660        /*
1661         * Use dma_map_sg directly to ensure we're using the correct
1662         * dev struct off of pcidev.
1663         */
1664        sg_count = dma_map_sg(&hba->pcidev->dev, scsi_sglist(sc),
1665                              scsi_sg_count(sc), sc->sc_data_direction);
1666        scsi_for_each_sg(sc, sg, sg_count, i) {
1667                sg_len = sg_dma_len(sg);
1668                addr = sg_dma_address(sg);
1669                if (sg_len > BNX2FC_MAX_BD_LEN) {
1670                        sg_frags = bnx2fc_split_bd(io_req, addr, sg_len,
1671                                                   bd_count);
1672                } else {
1673
1674                        sg_frags = 1;
1675                        bd[bd_count].buf_addr_lo = addr & 0xffffffff;
1676                        bd[bd_count].buf_addr_hi  = addr >> 32;
1677                        bd[bd_count].buf_len = (u16)sg_len;
1678                        bd[bd_count].flags = 0;
1679                }
1680                bd_count += sg_frags;
1681                byte_count += sg_len;
1682        }
1683        if (byte_count != scsi_bufflen(sc))
1684                printk(KERN_ERR PFX "byte_count = %d != scsi_bufflen = %d, "
1685                        "task_id = 0x%x\n", byte_count, scsi_bufflen(sc),
1686                        io_req->xid);
1687        return bd_count;
1688}
1689
1690static int bnx2fc_build_bd_list_from_sg(struct bnx2fc_cmd *io_req)
1691{
1692        struct scsi_cmnd *sc = io_req->sc_cmd;
1693        struct fcoe_bd_ctx *bd = io_req->bd_tbl->bd_tbl;
1694        int bd_count;
1695
1696        if (scsi_sg_count(sc)) {
1697                bd_count = bnx2fc_map_sg(io_req);
1698                if (bd_count == 0)
1699                        return -ENOMEM;
1700        } else {
1701                bd_count = 0;
1702                bd[0].buf_addr_lo = bd[0].buf_addr_hi = 0;
1703                bd[0].buf_len = bd[0].flags = 0;
1704        }
1705        io_req->bd_tbl->bd_valid = bd_count;
1706
1707        /*
1708         * Return the command to ML if BD count exceeds the max number
1709         * that can be handled by FW.
1710         */
1711        if (bd_count > BNX2FC_FW_MAX_BDS_PER_CMD) {
1712                pr_err("bd_count = %d exceeded FW supported max BD(255), task_id = 0x%x\n",
1713                       bd_count, io_req->xid);
1714                return -ENOMEM;
1715        }
1716
1717        return 0;
1718}
1719
1720static void bnx2fc_unmap_sg_list(struct bnx2fc_cmd *io_req)
1721{
1722        struct scsi_cmnd *sc = io_req->sc_cmd;
1723        struct bnx2fc_interface *interface = io_req->port->priv;
1724        struct bnx2fc_hba *hba = interface->hba;
1725
1726        /*
1727         * Use dma_unmap_sg directly to ensure we're using the correct
1728         * dev struct off of pcidev.
1729         */
1730        if (io_req->bd_tbl->bd_valid && sc && scsi_sg_count(sc)) {
1731                dma_unmap_sg(&hba->pcidev->dev, scsi_sglist(sc),
1732                    scsi_sg_count(sc), sc->sc_data_direction);
1733                io_req->bd_tbl->bd_valid = 0;
1734        }
1735}
1736
1737void bnx2fc_build_fcp_cmnd(struct bnx2fc_cmd *io_req,
1738                                  struct fcp_cmnd *fcp_cmnd)
1739{
1740        struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1741
1742        memset(fcp_cmnd, 0, sizeof(struct fcp_cmnd));
1743
1744        int_to_scsilun(sc_cmd->device->lun, &fcp_cmnd->fc_lun);
1745
1746        fcp_cmnd->fc_dl = htonl(io_req->data_xfer_len);
1747        memcpy(fcp_cmnd->fc_cdb, sc_cmd->cmnd, sc_cmd->cmd_len);
1748
1749        fcp_cmnd->fc_cmdref = 0;
1750        fcp_cmnd->fc_pri_ta = 0;
1751        fcp_cmnd->fc_tm_flags = io_req->mp_req.tm_flags;
1752        fcp_cmnd->fc_flags = io_req->io_req_flags;
1753        fcp_cmnd->fc_pri_ta = FCP_PTA_SIMPLE;
1754}
1755
1756static void bnx2fc_parse_fcp_rsp(struct bnx2fc_cmd *io_req,
1757                                 struct fcoe_fcp_rsp_payload *fcp_rsp,
1758                                 u8 num_rq)
1759{
1760        struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1761        struct bnx2fc_rport *tgt = io_req->tgt;
1762        u8 rsp_flags = fcp_rsp->fcp_flags.flags;
1763        u32 rq_buff_len = 0;
1764        int i;
1765        unsigned char *rq_data;
1766        unsigned char *dummy;
1767        int fcp_sns_len = 0;
1768        int fcp_rsp_len = 0;
1769
1770        io_req->fcp_status = FC_GOOD;
1771        io_req->fcp_resid = 0;
1772        if (rsp_flags & (FCOE_FCP_RSP_FLAGS_FCP_RESID_OVER |
1773            FCOE_FCP_RSP_FLAGS_FCP_RESID_UNDER))
1774                io_req->fcp_resid = fcp_rsp->fcp_resid;
1775
1776        io_req->scsi_comp_flags = rsp_flags;
1777        CMD_SCSI_STATUS(sc_cmd) = io_req->cdb_status =
1778                                fcp_rsp->scsi_status_code;
1779
1780        /* Fetch fcp_rsp_info and fcp_sns_info if available */
1781        if (num_rq) {
1782
1783                /*
1784                 * We do not anticipate num_rq >1, as the linux defined
1785                 * SCSI_SENSE_BUFFERSIZE is 96 bytes + 8 bytes of FCP_RSP_INFO
1786                 * 256 bytes of single rq buffer is good enough to hold this.
1787                 */
1788
1789                if (rsp_flags &
1790                    FCOE_FCP_RSP_FLAGS_FCP_RSP_LEN_VALID) {
1791                        fcp_rsp_len = rq_buff_len
1792                                        = fcp_rsp->fcp_rsp_len;
1793                }
1794
1795                if (rsp_flags &
1796                    FCOE_FCP_RSP_FLAGS_FCP_SNS_LEN_VALID) {
1797                        fcp_sns_len = fcp_rsp->fcp_sns_len;
1798                        rq_buff_len += fcp_rsp->fcp_sns_len;
1799                }
1800
1801                io_req->fcp_rsp_len = fcp_rsp_len;
1802                io_req->fcp_sns_len = fcp_sns_len;
1803
1804                if (rq_buff_len > num_rq * BNX2FC_RQ_BUF_SZ) {
1805                        /* Invalid sense sense length. */
1806                        printk(KERN_ERR PFX "invalid sns length %d\n",
1807                                rq_buff_len);
1808                        /* reset rq_buff_len */
1809                        rq_buff_len =  num_rq * BNX2FC_RQ_BUF_SZ;
1810                }
1811
1812                rq_data = bnx2fc_get_next_rqe(tgt, 1);
1813
1814                if (num_rq > 1) {
1815                        /* We do not need extra sense data */
1816                        for (i = 1; i < num_rq; i++)
1817                                dummy = bnx2fc_get_next_rqe(tgt, 1);
1818                }
1819
1820                /* fetch fcp_rsp_code */
1821                if ((fcp_rsp_len == 4) || (fcp_rsp_len == 8)) {
1822                        /* Only for task management function */
1823                        io_req->fcp_rsp_code = rq_data[3];
1824                        BNX2FC_IO_DBG(io_req, "fcp_rsp_code = %d\n",
1825                                io_req->fcp_rsp_code);
1826                }
1827
1828                /* fetch sense data */
1829                rq_data += fcp_rsp_len;
1830
1831                if (fcp_sns_len > SCSI_SENSE_BUFFERSIZE) {
1832                        printk(KERN_ERR PFX "Truncating sense buffer\n");
1833                        fcp_sns_len = SCSI_SENSE_BUFFERSIZE;
1834                }
1835
1836                memset(sc_cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1837                if (fcp_sns_len)
1838                        memcpy(sc_cmd->sense_buffer, rq_data, fcp_sns_len);
1839
1840                /* return RQ entries */
1841                for (i = 0; i < num_rq; i++)
1842                        bnx2fc_return_rqe(tgt, 1);
1843        }
1844}
1845
1846/**
1847 * bnx2fc_queuecommand - Queuecommand function of the scsi template
1848 *
1849 * @host:       The Scsi_Host the command was issued to
1850 * @sc_cmd:     struct scsi_cmnd to be executed
1851 *
1852 * This is the IO strategy routine, called by SCSI-ML
1853 **/
1854int bnx2fc_queuecommand(struct Scsi_Host *host,
1855                        struct scsi_cmnd *sc_cmd)
1856{
1857        struct fc_lport *lport = shost_priv(host);
1858        struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
1859        struct fc_rport_libfc_priv *rp = rport->dd_data;
1860        struct bnx2fc_rport *tgt;
1861        struct bnx2fc_cmd *io_req;
1862        int rc = 0;
1863        int rval;
1864
1865        rval = fc_remote_port_chkready(rport);
1866        if (rval) {
1867                sc_cmd->result = rval;
1868                sc_cmd->scsi_done(sc_cmd);
1869                return 0;
1870        }
1871
1872        if ((lport->state != LPORT_ST_READY) || !(lport->link_up)) {
1873                rc = SCSI_MLQUEUE_HOST_BUSY;
1874                goto exit_qcmd;
1875        }
1876
1877        /* rport and tgt are allocated together, so tgt should be non-NULL */
1878        tgt = (struct bnx2fc_rport *)&rp[1];
1879
1880        if (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags)) {
1881                /*
1882                 * Session is not offloaded yet. Let SCSI-ml retry
1883                 * the command.
1884                 */
1885                rc = SCSI_MLQUEUE_TARGET_BUSY;
1886                goto exit_qcmd;
1887        }
1888        if (tgt->retry_delay_timestamp) {
1889                if (time_after(jiffies, tgt->retry_delay_timestamp)) {
1890                        tgt->retry_delay_timestamp = 0;
1891                } else {
1892                        /* If retry_delay timer is active, flow off the ML */
1893                        rc = SCSI_MLQUEUE_TARGET_BUSY;
1894                        goto exit_qcmd;
1895                }
1896        }
1897
1898        spin_lock_bh(&tgt->tgt_lock);
1899
1900        io_req = bnx2fc_cmd_alloc(tgt);
1901        if (!io_req) {
1902                rc = SCSI_MLQUEUE_HOST_BUSY;
1903                goto exit_qcmd_tgtlock;
1904        }
1905        io_req->sc_cmd = sc_cmd;
1906
1907        if (bnx2fc_post_io_req(tgt, io_req)) {
1908                printk(KERN_ERR PFX "Unable to post io_req\n");
1909                rc = SCSI_MLQUEUE_HOST_BUSY;
1910                goto exit_qcmd_tgtlock;
1911        }
1912
1913exit_qcmd_tgtlock:
1914        spin_unlock_bh(&tgt->tgt_lock);
1915exit_qcmd:
1916        return rc;
1917}
1918
1919void bnx2fc_process_scsi_cmd_compl(struct bnx2fc_cmd *io_req,
1920                                   struct fcoe_task_ctx_entry *task,
1921                                   u8 num_rq)
1922{
1923        struct fcoe_fcp_rsp_payload *fcp_rsp;
1924        struct bnx2fc_rport *tgt = io_req->tgt;
1925        struct scsi_cmnd *sc_cmd;
1926        u16 scope = 0, qualifier = 0;
1927
1928        /* scsi_cmd_cmpl is called with tgt lock held */
1929
1930        if (test_and_set_bit(BNX2FC_FLAG_IO_COMPL, &io_req->req_flags)) {
1931                /* we will not receive ABTS response for this IO */
1932                BNX2FC_IO_DBG(io_req, "Timer context finished processing "
1933                           "this scsi cmd\n");
1934                return;
1935        }
1936
1937        /* Cancel the timeout_work, as we received IO completion */
1938        if (cancel_delayed_work(&io_req->timeout_work))
1939                kref_put(&io_req->refcount,
1940                         bnx2fc_cmd_release); /* drop timer hold */
1941
1942        sc_cmd = io_req->sc_cmd;
1943        if (sc_cmd == NULL) {
1944                printk(KERN_ERR PFX "scsi_cmd_compl - sc_cmd is NULL\n");
1945                return;
1946        }
1947
1948        /* Fetch fcp_rsp from task context and perform cmd completion */
1949        fcp_rsp = (struct fcoe_fcp_rsp_payload *)
1950                   &(task->rxwr_only.union_ctx.comp_info.fcp_rsp.payload);
1951
1952        /* parse fcp_rsp and obtain sense data from RQ if available */
1953        bnx2fc_parse_fcp_rsp(io_req, fcp_rsp, num_rq);
1954
1955        if (!sc_cmd->SCp.ptr) {
1956                printk(KERN_ERR PFX "SCp.ptr is NULL\n");
1957                return;
1958        }
1959
1960        if (io_req->on_active_queue) {
1961                list_del_init(&io_req->link);
1962                io_req->on_active_queue = 0;
1963                /* Move IO req to retire queue */
1964                list_add_tail(&io_req->link, &tgt->io_retire_queue);
1965        } else {
1966                /* This should not happen, but could have been pulled
1967                 * by bnx2fc_flush_active_ios(), or during a race
1968                 * between command abort and (late) completion.
1969                 */
1970                BNX2FC_IO_DBG(io_req, "xid not on active_cmd_queue\n");
1971                if (io_req->wait_for_abts_comp)
1972                        if (test_and_clear_bit(BNX2FC_FLAG_EH_ABORT,
1973                                               &io_req->req_flags))
1974                                complete(&io_req->abts_done);
1975        }
1976
1977        bnx2fc_unmap_sg_list(io_req);
1978        io_req->sc_cmd = NULL;
1979
1980        switch (io_req->fcp_status) {
1981        case FC_GOOD:
1982                if (io_req->cdb_status == 0) {
1983                        /* Good IO completion */
1984                        sc_cmd->result = DID_OK << 16;
1985                } else {
1986                        /* Transport status is good, SCSI status not good */
1987                        BNX2FC_IO_DBG(io_req, "scsi_cmpl: cdb_status = %d"
1988                                 " fcp_resid = 0x%x\n",
1989                                io_req->cdb_status, io_req->fcp_resid);
1990                        sc_cmd->result = (DID_OK << 16) | io_req->cdb_status;
1991
1992                        if (io_req->cdb_status == SAM_STAT_TASK_SET_FULL ||
1993                            io_req->cdb_status == SAM_STAT_BUSY) {
1994                                /* Newer array firmware with BUSY or
1995                                 * TASK_SET_FULL may return a status that needs
1996                                 * the scope bits masked.
1997                                 * Or a huge delay timestamp up to 27 minutes
1998                                 * can result.
1999                                 */
2000                                if (fcp_rsp->retry_delay_timer) {
2001                                        /* Upper 2 bits */
2002                                        scope = fcp_rsp->retry_delay_timer
2003                                                & 0xC000;
2004                                        /* Lower 14 bits */
2005                                        qualifier = fcp_rsp->retry_delay_timer
2006                                                & 0x3FFF;
2007                                }
2008                                if (scope > 0 && qualifier > 0 &&
2009                                        qualifier <= 0x3FEF) {
2010                                        /* Set the jiffies +
2011                                         * retry_delay_timer * 100ms
2012                                         * for the rport/tgt
2013                                         */
2014                                        tgt->retry_delay_timestamp = jiffies +
2015                                                (qualifier * HZ / 10);
2016                                }
2017                        }
2018                }
2019                if (io_req->fcp_resid)
2020                        scsi_set_resid(sc_cmd, io_req->fcp_resid);
2021                break;
2022        default:
2023                printk(KERN_ERR PFX "scsi_cmd_compl: fcp_status = %d\n",
2024                        io_req->fcp_status);
2025                break;
2026        }
2027        sc_cmd->SCp.ptr = NULL;
2028        sc_cmd->scsi_done(sc_cmd);
2029        kref_put(&io_req->refcount, bnx2fc_cmd_release);
2030}
2031
2032int bnx2fc_post_io_req(struct bnx2fc_rport *tgt,
2033                               struct bnx2fc_cmd *io_req)
2034{
2035        struct fcoe_task_ctx_entry *task;
2036        struct fcoe_task_ctx_entry *task_page;
2037        struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
2038        struct fcoe_port *port = tgt->port;
2039        struct bnx2fc_interface *interface = port->priv;
2040        struct bnx2fc_hba *hba = interface->hba;
2041        struct fc_lport *lport = port->lport;
2042        struct fc_stats *stats;
2043        int task_idx, index;
2044        u16 xid;
2045
2046        /* bnx2fc_post_io_req() is called with the tgt_lock held */
2047
2048        /* Initialize rest of io_req fields */
2049        io_req->cmd_type = BNX2FC_SCSI_CMD;
2050        io_req->port = port;
2051        io_req->tgt = tgt;
2052        io_req->data_xfer_len = scsi_bufflen(sc_cmd);
2053        sc_cmd->SCp.ptr = (char *)io_req;
2054
2055        stats = per_cpu_ptr(lport->stats, get_cpu());
2056        if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE) {
2057                io_req->io_req_flags = BNX2FC_READ;
2058                stats->InputRequests++;
2059                stats->InputBytes += io_req->data_xfer_len;
2060        } else if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) {
2061                io_req->io_req_flags = BNX2FC_WRITE;
2062                stats->OutputRequests++;
2063                stats->OutputBytes += io_req->data_xfer_len;
2064        } else {
2065                io_req->io_req_flags = 0;
2066                stats->ControlRequests++;
2067        }
2068        put_cpu();
2069
2070        xid = io_req->xid;
2071
2072        /* Build buffer descriptor list for firmware from sg list */
2073        if (bnx2fc_build_bd_list_from_sg(io_req)) {
2074                printk(KERN_ERR PFX "BD list creation failed\n");
2075                kref_put(&io_req->refcount, bnx2fc_cmd_release);
2076                return -EAGAIN;
2077        }
2078
2079        task_idx = xid / BNX2FC_TASKS_PER_PAGE;
2080        index = xid % BNX2FC_TASKS_PER_PAGE;
2081
2082        /* Initialize task context for this IO request */
2083        task_page = (struct fcoe_task_ctx_entry *) hba->task_ctx[task_idx];
2084        task = &(task_page[index]);
2085        bnx2fc_init_task(io_req, task);
2086
2087        if (tgt->flush_in_prog) {
2088                printk(KERN_ERR PFX "Flush in progress..Host Busy\n");
2089                kref_put(&io_req->refcount, bnx2fc_cmd_release);
2090                return -EAGAIN;
2091        }
2092
2093        if (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags)) {
2094                printk(KERN_ERR PFX "Session not ready...post_io\n");
2095                kref_put(&io_req->refcount, bnx2fc_cmd_release);
2096                return -EAGAIN;
2097        }
2098
2099        /* Time IO req */
2100        if (tgt->io_timeout)
2101                bnx2fc_cmd_timer_set(io_req, BNX2FC_IO_TIMEOUT);
2102        /* Obtain free SQ entry */
2103        bnx2fc_add_2_sq(tgt, xid);
2104
2105        /* Enqueue the io_req to active_cmd_queue */
2106
2107        io_req->on_active_queue = 1;
2108        /* move io_req from pending_queue to active_queue */
2109        list_add_tail(&io_req->link, &tgt->active_cmd_queue);
2110
2111        /* Ring doorbell */
2112        bnx2fc_ring_doorbell(tgt);
2113        return 0;
2114}
2115