drivers/scsi/fnic/fnic_scsi.c

   1 /*
   2  * Copyright 2008 Cisco Systems, Inc.  All rights reserved.
   3  * Copyright 2007 Nuova Systems, Inc.  All rights reserved.
   4  *
   5  * This program is free software; you may redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; version 2 of the License.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  10  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  11  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  12  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  13  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  14  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  15  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  16  * SOFTWARE.
  17  */
  18 #include <linux/mempool.h>
  19 #include <linux/errno.h>
  20 #include <linux/init.h>
  21 #include <linux/workqueue.h>
  22 #include <linux/pci.h>
  23 #include <linux/scatterlist.h>
  24 #include <linux/skbuff.h>
  25 #include <linux/spinlock.h>
  26 #include <linux/if_ether.h>
  27 #include <linux/if_vlan.h>
  28 #include <linux/delay.h>
  29 #include <linux/gfp.h>
  30 #include <scsi/scsi.h>
  31 #include <scsi/scsi_host.h>
  32 #include <scsi/scsi_device.h>
  33 #include <scsi/scsi_cmnd.h>
  34 #include <scsi/scsi_tcq.h>
  35 #include <scsi/fc/fc_els.h>
  36 #include <scsi/fc/fc_fcoe.h>
  37 #include <scsi/libfc.h>
  38 #include <scsi/fc_frame.h>
  39 #include "fnic_io.h"
  40 #include "fnic.h"
  41
  42 const char *fnic_state_str[] = {
  43         [FNIC_IN_FC_MODE] =           "FNIC_IN_FC_MODE",
  44         [FNIC_IN_FC_TRANS_ETH_MODE] = "FNIC_IN_FC_TRANS_ETH_MODE",
  45         [FNIC_IN_ETH_MODE] =          "FNIC_IN_ETH_MODE",
  46         [FNIC_IN_ETH_TRANS_FC_MODE] = "FNIC_IN_ETH_TRANS_FC_MODE",
  47 };
  48
  49 static const char *fnic_ioreq_state_str[] = {
  50         [FNIC_IOREQ_NOT_INITED] = "FNIC_IOREQ_NOT_INITED",
  51         [FNIC_IOREQ_CMD_PENDING] = "FNIC_IOREQ_CMD_PENDING",
  52         [FNIC_IOREQ_ABTS_PENDING] = "FNIC_IOREQ_ABTS_PENDING",
  53         [FNIC_IOREQ_ABTS_COMPLETE] = "FNIC_IOREQ_ABTS_COMPLETE",
  54         [FNIC_IOREQ_CMD_COMPLETE] = "FNIC_IOREQ_CMD_COMPLETE",
  55 };
  56
  57 static const char *fcpio_status_str[] =  {
  58         [FCPIO_SUCCESS] = "FCPIO_SUCCESS", /*0x0*/
  59         [FCPIO_INVALID_HEADER] = "FCPIO_INVALID_HEADER",
  60         [FCPIO_OUT_OF_RESOURCE] = "FCPIO_OUT_OF_RESOURCE",
  61         [FCPIO_INVALID_PARAM] = "FCPIO_INVALID_PARAM]",
  62         [FCPIO_REQ_NOT_SUPPORTED] = "FCPIO_REQ_NOT_SUPPORTED",
  63         [FCPIO_IO_NOT_FOUND] = "FCPIO_IO_NOT_FOUND",
  64         [FCPIO_ABORTED] = "FCPIO_ABORTED", /*0x41*/
  65         [FCPIO_TIMEOUT] = "FCPIO_TIMEOUT",
  66         [FCPIO_SGL_INVALID] = "FCPIO_SGL_INVALID",
  67         [FCPIO_MSS_INVALID] = "FCPIO_MSS_INVALID",
  68         [FCPIO_DATA_CNT_MISMATCH] = "FCPIO_DATA_CNT_MISMATCH",
  69         [FCPIO_FW_ERR] = "FCPIO_FW_ERR",
  70         [FCPIO_ITMF_REJECTED] = "FCPIO_ITMF_REJECTED",
  71         [FCPIO_ITMF_FAILED] = "FCPIO_ITMF_FAILED",
  72         [FCPIO_ITMF_INCORRECT_LUN] = "FCPIO_ITMF_INCORRECT_LUN",
  73         [FCPIO_CMND_REJECTED] = "FCPIO_CMND_REJECTED",
  74         [FCPIO_NO_PATH_AVAIL] = "FCPIO_NO_PATH_AVAIL",
  75         [FCPIO_PATH_FAILED] = "FCPIO_PATH_FAILED",
  76         [FCPIO_LUNMAP_CHNG_PEND] = "FCPIO_LUNHMAP_CHNG_PEND",
  77 };
  78
  79 const char *fnic_state_to_str(unsigned int state)
  80 {
  81         if (state >= ARRAY_SIZE(fnic_state_str) || !fnic_state_str[state])
  82                 return "unknown";
  83
  84         return fnic_state_str[state];
  85 }
  86
  87 static const char *fnic_ioreq_state_to_str(unsigned int state)
  88 {
  89         if (state >= ARRAY_SIZE(fnic_ioreq_state_str) ||
  90             !fnic_ioreq_state_str[state])
  91                 return "unknown";
  92
  93         return fnic_ioreq_state_str[state];
  94 }
  95
  96 static const char *fnic_fcpio_status_to_str(unsigned int status)
  97 {
  98         if (status >= ARRAY_SIZE(fcpio_status_str) || !fcpio_status_str[status])
  99                 return "unknown";
 100
 101         return fcpio_status_str[status];
 102 }
 103
 104 static void fnic_cleanup_io(struct fnic *fnic, int exclude_id);
 105
 106 static inline spinlock_t *fnic_io_lock_hash(struct fnic *fnic,
 107                                             struct scsi_cmnd *sc)
 108 {
 109         u32 hash = sc->request->tag & (FNIC_IO_LOCKS - 1);
 110
 111         return &fnic->io_req_lock[hash];
 112 }
 113
 114 static inline spinlock_t *fnic_io_lock_tag(struct fnic *fnic,
 115                                             int tag)
 116 {
 117         return &fnic->io_req_lock[tag & (FNIC_IO_LOCKS - 1)];
 118 }
 119
 120 /*
 121  * Unmap the data buffer and sense buffer for an io_req,
 122  * also unmap and free the device-private scatter/gather list.
 123  */
 124 static void fnic_release_ioreq_buf(struct fnic *fnic,
 125                                    struct fnic_io_req *io_req,
 126                                    struct scsi_cmnd *sc)
 127 {
 128         if (io_req->sgl_list_pa)
 129                 dma_unmap_single(&fnic->pdev->dev, io_req->sgl_list_pa,
 130                                  sizeof(io_req->sgl_list[0]) * io_req->sgl_cnt,
 131                                  DMA_TO_DEVICE);
 132         scsi_dma_unmap(sc);
 133
 134         if (io_req->sgl_cnt)
 135                 mempool_free(io_req->sgl_list_alloc,
 136                              fnic->io_sgl_pool[io_req->sgl_type]);
 137         if (io_req->sense_buf_pa)
 138                 dma_unmap_single(&fnic->pdev->dev, io_req->sense_buf_pa,
 139                                  SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
 140 }
 141
 142 /* Free up Copy Wq descriptors. Called with copy_wq lock held */
 143 static int free_wq_copy_descs(struct fnic *fnic, struct vnic_wq_copy *wq)
 144 {
 145         /* if no Ack received from firmware, then nothing to clean */
 146         if (!fnic->fw_ack_recd[0])
 147                 return 1;
 148
 149         /*
 150          * Update desc_available count based on number of freed descriptors
 151          * Account for wraparound
 152          */
 153         if (wq->to_clean_index <= fnic->fw_ack_index[0])
 154                 wq->ring.desc_avail += (fnic->fw_ack_index[0]
 155                                         - wq->to_clean_index + 1);
 156         else
 157                 wq->ring.desc_avail += (wq->ring.desc_count
 158                                         - wq->to_clean_index
 159                                         + fnic->fw_ack_index[0] + 1);
 160
 161         /*
 162          * just bump clean index to ack_index+1 accounting for wraparound
 163          * this will essentially free up all descriptors between
 164          * to_clean_index and fw_ack_index, both inclusive
 165          */
 166         wq->to_clean_index =
 167                 (fnic->fw_ack_index[0] + 1) % wq->ring.desc_count;
 168
 169         /* we have processed the acks received so far */
 170         fnic->fw_ack_recd[0] = 0;
 171         return 0;
 172 }
 173
 174
 175 /**
 176  * __fnic_set_state_flags
 177  * Sets/Clears bits in fnic's state_flags
 178  **/
 179 void
 180 __fnic_set_state_flags(struct fnic *fnic, unsigned long st_flags,
 181                         unsigned long clearbits)
 182 {
 183         unsigned long flags = 0;
 184         unsigned long host_lock_flags = 0;
 185
 186         spin_lock_irqsave(&fnic->fnic_lock, flags);
 187         spin_lock_irqsave(fnic->lport->host->host_lock, host_lock_flags);
 188
 189         if (clearbits)
 190                 fnic->state_flags &= ~st_flags;
 191         else
 192                 fnic->state_flags |= st_flags;
 193
 194         spin_unlock_irqrestore(fnic->lport->host->host_lock, host_lock_flags);
 195         spin_unlock_irqrestore(&fnic->fnic_lock, flags);
 196
 197         return;
 198 }
 199
 200
 201 /*
 202  * fnic_fw_reset_handler
 203  * Routine to send reset msg to fw
 204  */
 205 int fnic_fw_reset_handler(struct fnic *fnic)
 206 {
 207         struct vnic_wq_copy *wq = &fnic->wq_copy[0];
 208         int ret = 0;
 209         unsigned long flags;
 210
 211         /* indicate fwreset to io path */
 212         fnic_set_state_flags(fnic, FNIC_FLAGS_FWRESET);
 213
 214         skb_queue_purge(&fnic->frame_queue);
 215         skb_queue_purge(&fnic->tx_queue);
 216
 217         /* wait for io cmpl */
 218         while (atomic_read(&fnic->in_flight))
 219                 schedule_timeout(msecs_to_jiffies(1));
 220
 221         spin_lock_irqsave(&fnic->wq_copy_lock[0], flags);
 222
 223         if (vnic_wq_copy_desc_avail(wq) <= fnic->wq_copy_desc_low[0])
 224                 free_wq_copy_descs(fnic, wq);
 225
 226         if (!vnic_wq_copy_desc_avail(wq))
 227                 ret = -EAGAIN;
 228         else {
 229                 fnic_queue_wq_copy_desc_fw_reset(wq, SCSI_NO_TAG);
 230                 atomic64_inc(&fnic->fnic_stats.fw_stats.active_fw_reqs);
 231                 if (atomic64_read(&fnic->fnic_stats.fw_stats.active_fw_reqs) >
 232                           atomic64_read(&fnic->fnic_stats.fw_stats.max_fw_reqs))
 233                         atomic64_set(&fnic->fnic_stats.fw_stats.max_fw_reqs,
 234                                 atomic64_read(
 235                                   &fnic->fnic_stats.fw_stats.active_fw_reqs));
 236         }
 237
 238         spin_unlock_irqrestore(&fnic->wq_copy_lock[0], flags);
 239
 240         if (!ret) {
 241                 atomic64_inc(&fnic->fnic_stats.reset_stats.fw_resets);
 242                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
 243                               "Issued fw reset\n");
 244         } else {
 245                 fnic_clear_state_flags(fnic, FNIC_FLAGS_FWRESET);
 246                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
 247                               "Failed to issue fw reset\n");
 248         }
 249
 250         return ret;
 251 }
 252
 253
 254 /*
 255  * fnic_flogi_reg_handler
 256  * Routine to send flogi register msg to fw
 257  */
 258 int fnic_flogi_reg_handler(struct fnic *fnic, u32 fc_id)
 259 {
 260         struct vnic_wq_copy *wq = &fnic->wq_copy[0];
 261         enum fcpio_flogi_reg_format_type format;
 262         struct fc_lport *lp = fnic->lport;
 263         u8 gw_mac[ETH_ALEN];
 264         int ret = 0;
 265         unsigned long flags;
 266
 267         spin_lock_irqsave(&fnic->wq_copy_lock[0], flags);
 268
 269         if (vnic_wq_copy_desc_avail(wq) <= fnic->wq_copy_desc_low[0])
 270                 free_wq_copy_descs(fnic, wq);
 271
 272         if (!vnic_wq_copy_desc_avail(wq)) {
 273                 ret = -EAGAIN;
 274                 goto flogi_reg_ioreq_end;
 275         }
 276
 277         if (fnic->ctlr.map_dest) {
 278                 memset(gw_mac, 0xff, ETH_ALEN);
 279                 format = FCPIO_FLOGI_REG_DEF_DEST;
 280         } else {
 281                 memcpy(gw_mac, fnic->ctlr.dest_addr, ETH_ALEN);
 282                 format = FCPIO_FLOGI_REG_GW_DEST;
 283         }
 284
 285         if ((fnic->config.flags & VFCF_FIP_CAPABLE) && !fnic->ctlr.map_dest) {
 286                 fnic_queue_wq_copy_desc_fip_reg(wq, SCSI_NO_TAG,
 287                                                 fc_id, gw_mac,
 288                                                 fnic->data_src_addr,
 289                                                 lp->r_a_tov, lp->e_d_tov);
 290                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
 291                               "FLOGI FIP reg issued fcid %x src %pM dest %pM\n",
 292                               fc_id, fnic->data_src_addr, gw_mac);
 293         } else {
 294                 fnic_queue_wq_copy_desc_flogi_reg(wq, SCSI_NO_TAG,
 295                                                   format, fc_id, gw_mac);
 296                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
 297                               "FLOGI reg issued fcid %x map %d dest %pM\n",
 298                               fc_id, fnic->ctlr.map_dest, gw_mac);
 299         }
 300
 301         atomic64_inc(&fnic->fnic_stats.fw_stats.active_fw_reqs);
 302         if (atomic64_read(&fnic->fnic_stats.fw_stats.active_fw_reqs) >
 303                   atomic64_read(&fnic->fnic_stats.fw_stats.max_fw_reqs))
 304                 atomic64_set(&fnic->fnic_stats.fw_stats.max_fw_reqs,
 305                   atomic64_read(&fnic->fnic_stats.fw_stats.active_fw_reqs));
 306
 307 flogi_reg_ioreq_end:
 308         spin_unlock_irqrestore(&fnic->wq_copy_lock[0], flags);
 309         return ret;
 310 }
 311
 312 /*
 313  * fnic_queue_wq_copy_desc
 314  * Routine to enqueue a wq copy desc
 315  */
 316 static inline int fnic_queue_wq_copy_desc(struct fnic *fnic,
 317                                           struct vnic_wq_copy *wq,
 318                                           struct fnic_io_req *io_req,
 319                                           struct scsi_cmnd *sc,
 320                                           int sg_count)
 321 {
 322         struct scatterlist *sg;
 323         struct fc_rport *rport = starget_to_rport(scsi_target(sc->device));
 324         struct fc_rport_libfc_priv *rp = rport->dd_data;
 325         struct host_sg_desc *desc;
 326         struct misc_stats *misc_stats = &fnic->fnic_stats.misc_stats;
 327         unsigned int i;
 328         unsigned long intr_flags;
 329         int flags;
 330         u8 exch_flags;
 331         struct scsi_lun fc_lun;
 332
 333         if (sg_count) {
 334                 /* For each SGE, create a device desc entry */
 335                 desc = io_req->sgl_list;
 336                 for_each_sg(scsi_sglist(sc), sg, sg_count, i) {
 337                         desc->addr = cpu_to_le64(sg_dma_address(sg));
 338                         desc->len = cpu_to_le32(sg_dma_len(sg));
 339                         desc->_resvd = 0;
 340                         desc++;
 341                 }
 342
 343                 io_req->sgl_list_pa = dma_map_single(&fnic->pdev->dev,
 344                                 io_req->sgl_list,
 345                                 sizeof(io_req->sgl_list[0]) * sg_count,
 346                                 DMA_TO_DEVICE);
 347                 if (dma_mapping_error(&fnic->pdev->dev, io_req->sgl_list_pa)) {
 348                         printk(KERN_ERR "DMA mapping failed\n");
 349                         return SCSI_MLQUEUE_HOST_BUSY;
 350                 }
 351         }
 352
 353         io_req->sense_buf_pa = dma_map_single(&fnic->pdev->dev,
 354                                               sc->sense_buffer,
 355                                               SCSI_SENSE_BUFFERSIZE,
 356                                               DMA_FROM_DEVICE);
 357         if (dma_mapping_error(&fnic->pdev->dev, io_req->sense_buf_pa)) {
 358                 dma_unmap_single(&fnic->pdev->dev, io_req->sgl_list_pa,
 359                                 sizeof(io_req->sgl_list[0]) * sg_count,
 360                                 DMA_TO_DEVICE);
 361                 printk(KERN_ERR "DMA mapping failed\n");
 362                 return SCSI_MLQUEUE_HOST_BUSY;
 363         }
 364
 365         int_to_scsilun(sc->device->lun, &fc_lun);
 366
 367         /* Enqueue the descriptor in the Copy WQ */
 368         spin_lock_irqsave(&fnic->wq_copy_lock[0], intr_flags);
 369
 370         if (vnic_wq_copy_desc_avail(wq) <= fnic->wq_copy_desc_low[0])
 371                 free_wq_copy_descs(fnic, wq);
 372
 373         if (unlikely(!vnic_wq_copy_desc_avail(wq))) {
 374                 spin_unlock_irqrestore(&fnic->wq_copy_lock[0], intr_flags);
 375                 FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host,
 376                           "fnic_queue_wq_copy_desc failure - no descriptors\n");
 377                 atomic64_inc(&misc_stats->io_cpwq_alloc_failures);
 378                 return SCSI_MLQUEUE_HOST_BUSY;
 379         }
 380
 381         flags = 0;
 382         if (sc->sc_data_direction == DMA_FROM_DEVICE)
 383                 flags = FCPIO_ICMND_RDDATA;
 384         else if (sc->sc_data_direction == DMA_TO_DEVICE)
 385                 flags = FCPIO_ICMND_WRDATA;
 386
 387         exch_flags = 0;
 388         if ((fnic->config.flags & VFCF_FCP_SEQ_LVL_ERR) &&
 389             (rp->flags & FC_RP_FLAGS_RETRY))
 390                 exch_flags |= FCPIO_ICMND_SRFLAG_RETRY;
 391
 392         fnic_queue_wq_copy_desc_icmnd_16(wq, sc->request->tag,
 393                                          0, exch_flags, io_req->sgl_cnt,
 394                                          SCSI_SENSE_BUFFERSIZE,
 395                                          io_req->sgl_list_pa,
 396                                          io_req->sense_buf_pa,
 397                                          0, /* scsi cmd ref, always 0 */
 398                                          FCPIO_ICMND_PTA_SIMPLE,
 399                                                 /* scsi pri and tag */
 400                                          flags, /* command flags */
 401                                          sc->cmnd, sc->cmd_len,
 402                                          scsi_bufflen(sc),
 403                                          fc_lun.scsi_lun, io_req->port_id,
 404                                          rport->maxframe_size, rp->r_a_tov,
 405                                          rp->e_d_tov);
 406
 407         atomic64_inc(&fnic->fnic_stats.fw_stats.active_fw_reqs);
 408         if (atomic64_read(&fnic->fnic_stats.fw_stats.active_fw_reqs) >
 409                   atomic64_read(&fnic->fnic_stats.fw_stats.max_fw_reqs))
 410                 atomic64_set(&fnic->fnic_stats.fw_stats.max_fw_reqs,
 411                   atomic64_read(&fnic->fnic_stats.fw_stats.active_fw_reqs));
 412
 413         spin_unlock_irqrestore(&fnic->wq_copy_lock[0], intr_flags);
 414         return 0;
 415 }
 416
 417 /*
 418  * fnic_queuecommand
 419  * Routine to send a scsi cdb
 420  * Called with host_lock held and interrupts disabled.
 421  */
 422 static int fnic_queuecommand_lck(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *))
 423 {
 424         struct fc_lport *lp = shost_priv(sc->device->host);
 425         struct fc_rport *rport;
 426         struct fnic_io_req *io_req = NULL;
 427         struct fnic *fnic = lport_priv(lp);
 428         struct fnic_stats *fnic_stats = &fnic->fnic_stats;
 429         struct vnic_wq_copy *wq;
 430         int ret;
 431         u64 cmd_trace;
 432         int sg_count = 0;
 433         unsigned long flags = 0;
 434         unsigned long ptr;
 435         spinlock_t *io_lock = NULL;
 436         int io_lock_acquired = 0;
 437         struct fc_rport_libfc_priv *rp;
 438
 439         if (unlikely(fnic_chk_state_flags_locked(fnic, FNIC_FLAGS_IO_BLOCKED)))
 440                 return SCSI_MLQUEUE_HOST_BUSY;
 441
 442         if (unlikely(fnic_chk_state_flags_locked(fnic, FNIC_FLAGS_FWRESET)))
 443                 return SCSI_MLQUEUE_HOST_BUSY;
 444
 445         rport = starget_to_rport(scsi_target(sc->device));
 446         if (!rport) {
 447                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
 448                                 "returning DID_NO_CONNECT for IO as rport is NULL\n");
 449                 sc->result = DID_NO_CONNECT << 16;
 450                 done(sc);
 451                 return 0;
 452         }
 453
 454         ret = fc_remote_port_chkready(rport);
 455         if (ret) {
 456                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
 457                                 "rport is not ready\n");
 458                 atomic64_inc(&fnic_stats->misc_stats.rport_not_ready);
 459                 sc->result = ret;
 460                 done(sc);
 461                 return 0;
 462         }
 463
 464         rp = rport->dd_data;
 465         if (!rp || rp->rp_state == RPORT_ST_DELETE) {
 466                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
 467                         "rport 0x%x removed, returning DID_NO_CONNECT\n",
 468                         rport->port_id);
 469
 470                 atomic64_inc(&fnic_stats->misc_stats.rport_not_ready);
 471                 sc->result = DID_NO_CONNECT<<16;
 472                 done(sc);
 473                 return 0;
 474         }
 475
 476         if (rp->rp_state != RPORT_ST_READY) {
 477                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
 478                         "rport 0x%x in state 0x%x, returning DID_IMM_RETRY\n",
 479                         rport->port_id, rp->rp_state);
 480
 481                 sc->result = DID_IMM_RETRY << 16;
 482                 done(sc);
 483                 return 0;
 484         }
 485
 486         if (lp->state != LPORT_ST_READY || !(lp->link_up))
 487                 return SCSI_MLQUEUE_HOST_BUSY;
 488
 489         atomic_inc(&fnic->in_flight);
 490
 491         /*
 492          * Release host lock, use driver resource specific locks from here.
 493          * Don't re-enable interrupts in case they were disabled prior to the
 494          * caller disabling them.
 495          */
 496         spin_unlock(lp->host->host_lock);
 497         CMD_STATE(sc) = FNIC_IOREQ_NOT_INITED;
 498         CMD_FLAGS(sc) = FNIC_NO_FLAGS;
 499
 500         /* Get a new io_req for this SCSI IO */
 501         io_req = mempool_alloc(fnic->io_req_pool, GFP_ATOMIC);
 502         if (!io_req) {
 503                 atomic64_inc(&fnic_stats->io_stats.alloc_failures);
 504                 ret = SCSI_MLQUEUE_HOST_BUSY;
 505                 goto out;
 506         }
 507         memset(io_req, 0, sizeof(*io_req));
 508
 509         /* Map the data buffer */
 510         sg_count = scsi_dma_map(sc);
 511         if (sg_count < 0) {
 512                 FNIC_TRACE(fnic_queuecommand, sc->device->host->host_no,
 513                           sc->request->tag, sc, 0, sc->cmnd[0],
 514                           sg_count, CMD_STATE(sc));
 515                 mempool_free(io_req, fnic->io_req_pool);
 516                 goto out;
 517         }
 518
 519         /* Determine the type of scatter/gather list we need */
 520         io_req->sgl_cnt = sg_count;
 521         io_req->sgl_type = FNIC_SGL_CACHE_DFLT;
 522         if (sg_count > FNIC_DFLT_SG_DESC_CNT)
 523                 io_req->sgl_type = FNIC_SGL_CACHE_MAX;
 524
 525         if (sg_count) {
 526                 io_req->sgl_list =
 527                         mempool_alloc(fnic->io_sgl_pool[io_req->sgl_type],
 528                                       GFP_ATOMIC);
 529                 if (!io_req->sgl_list) {
 530                         atomic64_inc(&fnic_stats->io_stats.alloc_failures);
 531                         ret = SCSI_MLQUEUE_HOST_BUSY;
 532                         scsi_dma_unmap(sc);
 533                         mempool_free(io_req, fnic->io_req_pool);
 534                         goto out;
 535                 }
 536
 537                 /* Cache sgl list allocated address before alignment */
 538                 io_req->sgl_list_alloc = io_req->sgl_list;
 539                 ptr = (unsigned long) io_req->sgl_list;
 540                 if (ptr % FNIC_SG_DESC_ALIGN) {
 541                         io_req->sgl_list = (struct host_sg_desc *)
 542                                 (((unsigned long) ptr
 543                                   + FNIC_SG_DESC_ALIGN - 1)
 544                                  & ~(FNIC_SG_DESC_ALIGN - 1));
 545                 }
 546         }
 547
 548         /*
 549         * Will acquire lock defore setting to IO initialized.
 550         */
 551
 552         io_lock = fnic_io_lock_hash(fnic, sc);
 553         spin_lock_irqsave(io_lock, flags);
 554
 555         /* initialize rest of io_req */
 556         io_lock_acquired = 1;
 557         io_req->port_id = rport->port_id;
 558         io_req->start_time = jiffies;
 559         CMD_STATE(sc) = FNIC_IOREQ_CMD_PENDING;
 560         CMD_SP(sc) = (char *)io_req;
 561         CMD_FLAGS(sc) |= FNIC_IO_INITIALIZED;
 562         sc->scsi_done = done;
 563
 564         /* create copy wq desc and enqueue it */
 565         wq = &fnic->wq_copy[0];
 566         ret = fnic_queue_wq_copy_desc(fnic, wq, io_req, sc, sg_count);
 567         if (ret) {
 568                 /*
 569                  * In case another thread cancelled the request,
 570                  * refetch the pointer under the lock.
 571                  */
 572                 FNIC_TRACE(fnic_queuecommand, sc->device->host->host_no,
 573                           sc->request->tag, sc, 0, 0, 0,
 574                           (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc)));
 575                 io_req = (struct fnic_io_req *)CMD_SP(sc);
 576                 CMD_SP(sc) = NULL;
 577                 CMD_STATE(sc) = FNIC_IOREQ_CMD_COMPLETE;
 578                 spin_unlock_irqrestore(io_lock, flags);
 579                 if (io_req) {
 580                         fnic_release_ioreq_buf(fnic, io_req, sc);
 581                         mempool_free(io_req, fnic->io_req_pool);
 582                 }
 583                 atomic_dec(&fnic->in_flight);
 584                 /* acquire host lock before returning to SCSI */
 585                 spin_lock(lp->host->host_lock);
 586                 return ret;
 587         } else {
 588                 atomic64_inc(&fnic_stats->io_stats.active_ios);
 589                 atomic64_inc(&fnic_stats->io_stats.num_ios);
 590                 if (atomic64_read(&fnic_stats->io_stats.active_ios) >
 591                           atomic64_read(&fnic_stats->io_stats.max_active_ios))
 592                         atomic64_set(&fnic_stats->io_stats.max_active_ios,
 593                              atomic64_read(&fnic_stats->io_stats.active_ios));
 594
 595                 /* REVISIT: Use per IO lock in the final code */
 596                 CMD_FLAGS(sc) |= FNIC_IO_ISSUED;
 597         }
 598 out:
 599         cmd_trace = ((u64)sc->cmnd[0] << 56 | (u64)sc->cmnd[7] << 40 |
 600                         (u64)sc->cmnd[8] << 32 | (u64)sc->cmnd[2] << 24 |
 601                         (u64)sc->cmnd[3] << 16 | (u64)sc->cmnd[4] << 8 |
 602                         sc->cmnd[5]);
 603
 604         FNIC_TRACE(fnic_queuecommand, sc->device->host->host_no,
 605                   sc->request->tag, sc, io_req,
 606                   sg_count, cmd_trace,
 607                   (((u64)CMD_FLAGS(sc) >> 32) | CMD_STATE(sc)));
 608
 609         /* if only we issued IO, will we have the io lock */
 610         if (io_lock_acquired)
 611                 spin_unlock_irqrestore(io_lock, flags);
 612
 613         atomic_dec(&fnic->in_flight);
 614         /* acquire host lock before returning to SCSI */
 615         spin_lock(lp->host->host_lock);
 616         return ret;
 617 }
 618
 619 DEF_SCSI_QCMD(fnic_queuecommand)
 620
 621 /*
 622  * fnic_fcpio_fw_reset_cmpl_handler
 623  * Routine to handle fw reset completion
 624  */
 625 static int fnic_fcpio_fw_reset_cmpl_handler(struct fnic *fnic,
 626                                             struct fcpio_fw_req *desc)
 627 {
 628         u8 type;
 629         u8 hdr_status;
 630         struct fcpio_tag tag;
 631         int ret = 0;
 632         unsigned long flags;
 633         struct reset_stats *reset_stats = &fnic->fnic_stats.reset_stats;
 634
 635         fcpio_header_dec(&desc->hdr, &type, &hdr_status, &tag);
 636
 637         atomic64_inc(&reset_stats->fw_reset_completions);
 638
 639         /* Clean up all outstanding io requests */
 640         fnic_cleanup_io(fnic, SCSI_NO_TAG);
 641
 642         atomic64_set(&fnic->fnic_stats.fw_stats.active_fw_reqs, 0);
 643         atomic64_set(&fnic->fnic_stats.io_stats.active_ios, 0);
 644         atomic64_set(&fnic->io_cmpl_skip, 0);
 645
 646         spin_lock_irqsave(&fnic->fnic_lock, flags);
 647
 648         /* fnic should be in FC_TRANS_ETH_MODE */
 649         if (fnic->state == FNIC_IN_FC_TRANS_ETH_MODE) {
 650                 /* Check status of reset completion */
 651                 if (!hdr_status) {
 652                         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
 653                                       "reset cmpl success\n");
 654                         /* Ready to send flogi out */
 655                         fnic->state = FNIC_IN_ETH_MODE;
 656                 } else {
 657                         FNIC_SCSI_DBG(KERN_DEBUG,
 658                                       fnic->lport->host,
 659                                       "fnic fw_reset : failed %s\n",
 660                                       fnic_fcpio_status_to_str(hdr_status));
 661
 662                         /*
 663                          * Unable to change to eth mode, cannot send out flogi
 664                          * Change state to fc mode, so that subsequent Flogi
 665                          * requests from libFC will cause more attempts to
 666                          * reset the firmware. Free the cached flogi
 667                          */
 668                         fnic->state = FNIC_IN_FC_MODE;
 669                         atomic64_inc(&reset_stats->fw_reset_failures);
 670                         ret = -1;
 671                 }
 672         } else {
 673                 FNIC_SCSI_DBG(KERN_DEBUG,
 674                               fnic->lport->host,
 675                               "Unexpected state %s while processing"
 676                               " reset cmpl\n", fnic_state_to_str(fnic->state));
 677                 atomic64_inc(&reset_stats->fw_reset_failures);
 678                 ret = -1;
 679         }
 680
 681         /* Thread removing device blocks till firmware reset is complete */
 682         if (fnic->remove_wait)
 683                 complete(fnic->remove_wait);
 684
 685         /*
 686          * If fnic is being removed, or fw reset failed
 687          * free the flogi frame. Else, send it out
 688          */
 689         if (fnic->remove_wait || ret) {
 690                 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
 691                 skb_queue_purge(&fnic->tx_queue);
 692                 goto reset_cmpl_handler_end;
 693         }
 694
 695         spin_unlock_irqrestore(&fnic->fnic_lock, flags);
 696
 697         fnic_flush_tx(fnic);
 698
 699  reset_cmpl_handler_end:
 700         fnic_clear_state_flags(fnic, FNIC_FLAGS_FWRESET);
 701
 702         return ret;
 703 }
 704
 705 /*
 706  * fnic_fcpio_flogi_reg_cmpl_handler
 707  * Routine to handle flogi register completion
 708  */
 709 static int fnic_fcpio_flogi_reg_cmpl_handler(struct fnic *fnic,
 710                                              struct fcpio_fw_req *desc)
 711 {
 712         u8 type;
 713         u8 hdr_status;
 714         struct fcpio_tag tag;
 715         int ret = 0;
 716         unsigned long flags;
 717
 718         fcpio_header_dec(&desc->hdr, &type, &hdr_status, &tag);
 719
 720         /* Update fnic state based on status of flogi reg completion */
 721         spin_lock_irqsave(&fnic->fnic_lock, flags);
 722
 723         if (fnic->state == FNIC_IN_ETH_TRANS_FC_MODE) {
 724
 725                 /* Check flogi registration completion status */
 726                 if (!hdr_status) {
 727                         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
 728                                       "flog reg succeeded\n");
 729                         fnic->state = FNIC_IN_FC_MODE;
 730                 } else {
 731                         FNIC_SCSI_DBG(KERN_DEBUG,
 732                                       fnic->lport->host,
 733                                       "fnic flogi reg :failed %s\n",
 734                                       fnic_fcpio_status_to_str(hdr_status));
 735                         fnic->state = FNIC_IN_ETH_MODE;
 736                         ret = -1;
 737                 }
 738         } else {
 739                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
 740                               "Unexpected fnic state %s while"
 741                               " processing flogi reg completion\n",
 742                               fnic_state_to_str(fnic->state));
 743                 ret = -1;
 744         }
 745
 746         if (!ret) {
 747                 if (fnic->stop_rx_link_events) {
 748                         spin_unlock_irqrestore(&fnic->fnic_lock, flags);
 749                         goto reg_cmpl_handler_end;
 750                 }
 751                 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
 752
 753                 fnic_flush_tx(fnic);
 754                 queue_work(fnic_event_queue, &fnic->frame_work);
 755         } else {
 756                 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
 757         }
 758
 759 reg_cmpl_handler_end:
 760         return ret;
 761 }
 762
 763 static inline int is_ack_index_in_range(struct vnic_wq_copy *wq,
 764                                         u16 request_out)
 765 {
 766         if (wq->to_clean_index <= wq->to_use_index) {
 767                 /* out of range, stale request_out index */
 768                 if (request_out < wq->to_clean_index ||
 769                     request_out >= wq->to_use_index)
 770                         return 0;
 771         } else {
 772                 /* out of range, stale request_out index */
 773                 if (request_out < wq->to_clean_index &&
 774                     request_out >= wq->to_use_index)
 775                         return 0;
 776         }
 777         /* request_out index is in range */
 778         return 1;
 779 }
 780
 781
 782 /*
 783  * Mark that ack received and store the Ack index. If there are multiple
 784  * acks received before Tx thread cleans it up, the latest value will be
 785  * used which is correct behavior. This state should be in the copy Wq
 786  * instead of in the fnic
 787  */
 788 static inline void fnic_fcpio_ack_handler(struct fnic *fnic,
 789                                           unsigned int cq_index,
 790                                           struct fcpio_fw_req *desc)
 791 {
 792         struct vnic_wq_copy *wq;
 793         u16 request_out = desc->u.ack.request_out;
 794         unsigned long flags;
 795         u64 *ox_id_tag = (u64 *)(void *)desc;
 796
 797         /* mark the ack state */
 798         wq = &fnic->wq_copy[cq_index - fnic->raw_wq_count - fnic->rq_count];
 799         spin_lock_irqsave(&fnic->wq_copy_lock[0], flags);
 800
 801         fnic->fnic_stats.misc_stats.last_ack_time = jiffies;
 802         if (is_ack_index_in_range(wq, request_out)) {
 803                 fnic->fw_ack_index[0] = request_out;
 804                 fnic->fw_ack_recd[0] = 1;
 805         } else
 806                 atomic64_inc(
 807                         &fnic->fnic_stats.misc_stats.ack_index_out_of_range);
 808
 809         spin_unlock_irqrestore(&fnic->wq_copy_lock[0], flags);
 810         FNIC_TRACE(fnic_fcpio_ack_handler,
 811                   fnic->lport->host->host_no, 0, 0, ox_id_tag[2], ox_id_tag[3],
 812                   ox_id_tag[4], ox_id_tag[5]);
 813 }
 814
 815 /*
 816  * fnic_fcpio_icmnd_cmpl_handler
 817  * Routine to handle icmnd completions
 818  */
 819 static void fnic_fcpio_icmnd_cmpl_handler(struct fnic *fnic,
 820                                          struct fcpio_fw_req *desc)
 821 {
 822         u8 type;
 823         u8 hdr_status;
 824         struct fcpio_tag tag;
 825         u32 id;
 826         u64 xfer_len = 0;
 827         struct fcpio_icmnd_cmpl *icmnd_cmpl;
 828         struct fnic_io_req *io_req;
 829         struct scsi_cmnd *sc;
 830         struct fnic_stats *fnic_stats = &fnic->fnic_stats;
 831         unsigned long flags;
 832         spinlock_t *io_lock;
 833         u64 cmd_trace;
 834         unsigned long start_time;
 835         unsigned long io_duration_time;
 836
 837         /* Decode the cmpl description to get the io_req id */
 838         fcpio_header_dec(&desc->hdr, &type, &hdr_status, &tag);
 839         fcpio_tag_id_dec(&tag, &id);
 840         icmnd_cmpl = &desc->u.icmnd_cmpl;
 841
 842         if (id >= fnic->fnic_max_tag_id) {
 843                 shost_printk(KERN_ERR, fnic->lport->host,
 844                         "Tag out of range tag %x hdr status = %s\n",
 845                              id, fnic_fcpio_status_to_str(hdr_status));
 846                 return;
 847         }
 848
 849         sc = scsi_host_find_tag(fnic->lport->host, id);
 850         WARN_ON_ONCE(!sc);
 851         if (!sc) {
 852                 atomic64_inc(&fnic_stats->io_stats.sc_null);
 853                 shost_printk(KERN_ERR, fnic->lport->host,
 854                           "icmnd_cmpl sc is null - "
 855                           "hdr status = %s tag = 0x%x desc = 0x%p\n",
 856                           fnic_fcpio_status_to_str(hdr_status), id, desc);
 857                 FNIC_TRACE(fnic_fcpio_icmnd_cmpl_handler,
 858                           fnic->lport->host->host_no, id,
 859                           ((u64)icmnd_cmpl->_resvd0[1] << 16 |
 860                           (u64)icmnd_cmpl->_resvd0[0]),
 861                           ((u64)hdr_status << 16 |
 862                           (u64)icmnd_cmpl->scsi_status << 8 |
 863                           (u64)icmnd_cmpl->flags), desc,
 864                           (u64)icmnd_cmpl->residual, 0);
 865                 return;
 866         }
 867
 868         io_lock = fnic_io_lock_hash(fnic, sc);
 869         spin_lock_irqsave(io_lock, flags);
 870         io_req = (struct fnic_io_req *)CMD_SP(sc);
 871         WARN_ON_ONCE(!io_req);
 872         if (!io_req) {
 873                 atomic64_inc(&fnic_stats->io_stats.ioreq_null);
 874                 CMD_FLAGS(sc) |= FNIC_IO_REQ_NULL;
 875                 spin_unlock_irqrestore(io_lock, flags);
 876                 shost_printk(KERN_ERR, fnic->lport->host,
 877                           "icmnd_cmpl io_req is null - "
 878                           "hdr status = %s tag = 0x%x sc 0x%p\n",
 879                           fnic_fcpio_status_to_str(hdr_status), id, sc);
 880                 return;
 881         }
 882         start_time = io_req->start_time;
 883
 884         /* firmware completed the io */
 885         io_req->io_completed = 1;
 886
 887         /*
 888          *  if SCSI-ML has already issued abort on this command,
 889          *  set completion of the IO. The abts path will clean it up
 890          */
 891         if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING) {
 892
 893                 /*
 894                  * set the FNIC_IO_DONE so that this doesn't get
 895                  * flagged as 'out of order' if it was not aborted
 896                  */
 897                 CMD_FLAGS(sc) |= FNIC_IO_DONE;
 898                 CMD_FLAGS(sc) |= FNIC_IO_ABTS_PENDING;
 899                 spin_unlock_irqrestore(io_lock, flags);
 900                 if(FCPIO_ABORTED == hdr_status)
 901                         CMD_FLAGS(sc) |= FNIC_IO_ABORTED;
 902
 903                 FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host,
 904                         "icmnd_cmpl abts pending "
 905                           "hdr status = %s tag = 0x%x sc = 0x%p "
 906                           "scsi_status = %x residual = %d\n",
 907                           fnic_fcpio_status_to_str(hdr_status),
 908                           id, sc,
 909                           icmnd_cmpl->scsi_status,
 910                           icmnd_cmpl->residual);
 911                 return;
 912         }
 913
 914         /* Mark the IO as complete */
 915         CMD_STATE(sc) = FNIC_IOREQ_CMD_COMPLETE;
 916
 917         icmnd_cmpl = &desc->u.icmnd_cmpl;
 918
 919         switch (hdr_status) {
 920         case FCPIO_SUCCESS:
 921                 sc->result = (DID_OK << 16) | icmnd_cmpl->scsi_status;
 922                 xfer_len = scsi_bufflen(sc);
 923                 scsi_set_resid(sc, icmnd_cmpl->residual);
 924
 925                 if (icmnd_cmpl->flags & FCPIO_ICMND_CMPL_RESID_UNDER)
 926                         xfer_len -= icmnd_cmpl->residual;
 927
 928                 if (icmnd_cmpl->scsi_status == SAM_STAT_CHECK_CONDITION)
 929                         atomic64_inc(&fnic_stats->misc_stats.check_condition);
 930
 931                 if (icmnd_cmpl->scsi_status == SAM_STAT_TASK_SET_FULL)
 932                         atomic64_inc(&fnic_stats->misc_stats.queue_fulls);
 933                 break;
 934
 935         case FCPIO_TIMEOUT:          /* request was timed out */
 936                 atomic64_inc(&fnic_stats->misc_stats.fcpio_timeout);
 937                 sc->result = (DID_TIME_OUT << 16) | icmnd_cmpl->scsi_status;
 938                 break;
 939
 940         case FCPIO_ABORTED:          /* request was aborted */
 941                 atomic64_inc(&fnic_stats->misc_stats.fcpio_aborted);
 942                 sc->result = (DID_ERROR << 16) | icmnd_cmpl->scsi_status;
 943                 break;
 944
 945         case FCPIO_DATA_CNT_MISMATCH: /* recv/sent more/less data than exp. */
 946                 atomic64_inc(&fnic_stats->misc_stats.data_count_mismatch);
 947                 scsi_set_resid(sc, icmnd_cmpl->residual);
 948                 sc->result = (DID_ERROR << 16) | icmnd_cmpl->scsi_status;
 949                 break;
 950
 951         case FCPIO_OUT_OF_RESOURCE:  /* out of resources to complete request */
 952                 atomic64_inc(&fnic_stats->fw_stats.fw_out_of_resources);
 953                 sc->result = (DID_REQUEUE << 16) | icmnd_cmpl->scsi_status;
 954                 break;
 955
 956         case FCPIO_IO_NOT_FOUND:     /* requested I/O was not found */
 957                 atomic64_inc(&fnic_stats->io_stats.io_not_found);
 958                 sc->result = (DID_ERROR << 16) | icmnd_cmpl->scsi_status;
 959                 break;
 960
 961         case FCPIO_SGL_INVALID:      /* request was aborted due to sgl error */
 962                 atomic64_inc(&fnic_stats->misc_stats.sgl_invalid);
 963                 sc->result = (DID_ERROR << 16) | icmnd_cmpl->scsi_status;
 964                 break;
 965
 966         case FCPIO_FW_ERR:           /* request was terminated due fw error */
 967                 atomic64_inc(&fnic_stats->fw_stats.io_fw_errs);
 968                 sc->result = (DID_ERROR << 16) | icmnd_cmpl->scsi_status;
 969                 break;
 970
 971         case FCPIO_MSS_INVALID:      /* request was aborted due to mss error */
 972                 atomic64_inc(&fnic_stats->misc_stats.mss_invalid);
 973                 sc->result = (DID_ERROR << 16) | icmnd_cmpl->scsi_status;
 974                 break;
 975
 976         case FCPIO_INVALID_HEADER:   /* header contains invalid data */
 977         case FCPIO_INVALID_PARAM:    /* some parameter in request invalid */
 978         case FCPIO_REQ_NOT_SUPPORTED:/* request type is not supported */
 979         default:
 980                 sc->result = (DID_ERROR << 16) | icmnd_cmpl->scsi_status;
 981                 break;
 982         }
 983
 984         /* Break link with the SCSI command */
 985         CMD_SP(sc) = NULL;
 986         CMD_FLAGS(sc) |= FNIC_IO_DONE;
 987
 988         spin_unlock_irqrestore(io_lock, flags);
 989
 990         if (hdr_status != FCPIO_SUCCESS) {
 991                 atomic64_inc(&fnic_stats->io_stats.io_failures);
 992                 shost_printk(KERN_ERR, fnic->lport->host, "hdr status = %s\n",
 993                              fnic_fcpio_status_to_str(hdr_status));
 994         }
 995
 996         fnic_release_ioreq_buf(fnic, io_req, sc);
 997
 998         mempool_free(io_req, fnic->io_req_pool);
 999
1000         cmd_trace = ((u64)hdr_status << 56) |
1001                   (u64)icmnd_cmpl->scsi_status << 48 |
1002                   (u64)icmnd_cmpl->flags << 40 | (u64)sc->cmnd[0] << 32 |
1003                   (u64)sc->cmnd[2] << 24 | (u64)sc->cmnd[3] << 16 |
1004                   (u64)sc->cmnd[4] << 8 | sc->cmnd[5];
1005
1006         FNIC_TRACE(fnic_fcpio_icmnd_cmpl_handler,
1007                   sc->device->host->host_no, id, sc,
1008                   ((u64)icmnd_cmpl->_resvd0[1] << 56 |
1009                   (u64)icmnd_cmpl->_resvd0[0] << 48 |
1010                   jiffies_to_msecs(jiffies - start_time)),
1011                   desc, cmd_trace,
1012                   (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc)));
1013
1014         if (sc->sc_data_direction == DMA_FROM_DEVICE) {
1015                 fnic->lport->host_stats.fcp_input_requests++;
1016                 fnic->fcp_input_bytes += xfer_len;
1017         } else if (sc->sc_data_direction == DMA_TO_DEVICE) {
1018                 fnic->lport->host_stats.fcp_output_requests++;
1019                 fnic->fcp_output_bytes += xfer_len;
1020         } else
1021                 fnic->lport->host_stats.fcp_control_requests++;
1022
1023         atomic64_dec(&fnic_stats->io_stats.active_ios);
1024         if (atomic64_read(&fnic->io_cmpl_skip))
1025                 atomic64_dec(&fnic->io_cmpl_skip);
1026         else
1027                 atomic64_inc(&fnic_stats->io_stats.io_completions);
1028
1029
1030         io_duration_time = jiffies_to_msecs(jiffies) -
1031                                                 jiffies_to_msecs(start_time);
1032
1033         if(io_duration_time <= 10)
1034                 atomic64_inc(&fnic_stats->io_stats.io_btw_0_to_10_msec);
1035         else if(io_duration_time <= 100)
1036                 atomic64_inc(&fnic_stats->io_stats.io_btw_10_to_100_msec);
1037         else if(io_duration_time <= 500)
1038                 atomic64_inc(&fnic_stats->io_stats.io_btw_100_to_500_msec);
1039         else if(io_duration_time <= 5000)
1040                 atomic64_inc(&fnic_stats->io_stats.io_btw_500_to_5000_msec);
1041         else if(io_duration_time <= 10000)
1042                 atomic64_inc(&fnic_stats->io_stats.io_btw_5000_to_10000_msec);
1043         else if(io_duration_time <= 30000)
1044                 atomic64_inc(&fnic_stats->io_stats.io_btw_10000_to_30000_msec);
1045         else {
1046                 atomic64_inc(&fnic_stats->io_stats.io_greater_than_30000_msec);
1047
1048                 if(io_duration_time > atomic64_read(&fnic_stats->io_stats.current_max_io_time))
1049                         atomic64_set(&fnic_stats->io_stats.current_max_io_time, io_duration_time);
1050         }
1051
1052         /* Call SCSI completion function to complete the IO */
1053         if (sc->scsi_done)
1054                 sc->scsi_done(sc);
1055 }
1056
1057 /* fnic_fcpio_itmf_cmpl_handler
1058  * Routine to handle itmf completions
1059  */
1060 static void fnic_fcpio_itmf_cmpl_handler(struct fnic *fnic,
1061                                         struct fcpio_fw_req *desc)
1062 {
1063         u8 type;
1064         u8 hdr_status;
1065         struct fcpio_tag tag;
1066         u32 id;
1067         struct scsi_cmnd *sc;
1068         struct fnic_io_req *io_req;
1069         struct fnic_stats *fnic_stats = &fnic->fnic_stats;
1070         struct abort_stats *abts_stats = &fnic->fnic_stats.abts_stats;
1071         struct terminate_stats *term_stats = &fnic->fnic_stats.term_stats;
1072         struct misc_stats *misc_stats = &fnic->fnic_stats.misc_stats;
1073         unsigned long flags;
1074         spinlock_t *io_lock;
1075         unsigned long start_time;
1076
1077         fcpio_header_dec(&desc->hdr, &type, &hdr_status, &tag);
1078         fcpio_tag_id_dec(&tag, &id);
1079
1080         if ((id & FNIC_TAG_MASK) >= fnic->fnic_max_tag_id) {
1081                 shost_printk(KERN_ERR, fnic->lport->host,
1082                 "Tag out of range tag %x hdr status = %s\n",
1083                 id, fnic_fcpio_status_to_str(hdr_status));
1084                 return;
1085         }
1086
1087         sc = scsi_host_find_tag(fnic->lport->host, id & FNIC_TAG_MASK);
1088         WARN_ON_ONCE(!sc);
1089         if (!sc) {
1090                 atomic64_inc(&fnic_stats->io_stats.sc_null);
1091                 shost_printk(KERN_ERR, fnic->lport->host,
1092                           "itmf_cmpl sc is null - hdr status = %s tag = 0x%x\n",
1093                           fnic_fcpio_status_to_str(hdr_status), id);
1094                 return;
1095         }
1096         io_lock = fnic_io_lock_hash(fnic, sc);
1097         spin_lock_irqsave(io_lock, flags);
1098         io_req = (struct fnic_io_req *)CMD_SP(sc);
1099         WARN_ON_ONCE(!io_req);
1100         if (!io_req) {
1101                 atomic64_inc(&fnic_stats->io_stats.ioreq_null);
1102                 spin_unlock_irqrestore(io_lock, flags);
1103                 CMD_FLAGS(sc) |= FNIC_IO_ABT_TERM_REQ_NULL;
1104                 shost_printk(KERN_ERR, fnic->lport->host,
1105                           "itmf_cmpl io_req is null - "
1106                           "hdr status = %s tag = 0x%x sc 0x%p\n",
1107                           fnic_fcpio_status_to_str(hdr_status), id, sc);
1108                 return;
1109         }
1110         start_time = io_req->start_time;
1111
1112         if ((id & FNIC_TAG_ABORT) && (id & FNIC_TAG_DEV_RST)) {
1113                 /* Abort and terminate completion of device reset req */
1114                 /* REVISIT : Add asserts about various flags */
1115                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1116                               "dev reset abts cmpl recd. id %x status %s\n",
1117                               id, fnic_fcpio_status_to_str(hdr_status));
1118                 CMD_STATE(sc) = FNIC_IOREQ_ABTS_COMPLETE;
1119                 CMD_ABTS_STATUS(sc) = hdr_status;
1120                 CMD_FLAGS(sc) |= FNIC_DEV_RST_DONE;
1121                 if (io_req->abts_done)
1122                         complete(io_req->abts_done);
1123                 spin_unlock_irqrestore(io_lock, flags);
1124         } else if (id & FNIC_TAG_ABORT) {
1125                 /* Completion of abort cmd */
1126                 switch (hdr_status) {
1127                 case FCPIO_SUCCESS:
1128                         break;
1129                 case FCPIO_TIMEOUT:
1130                         if (CMD_FLAGS(sc) & FNIC_IO_ABTS_ISSUED)
1131                                 atomic64_inc(&abts_stats->abort_fw_timeouts);
1132                         else
1133                                 atomic64_inc(
1134                                         &term_stats->terminate_fw_timeouts);
1135                         break;
1136                 case FCPIO_ITMF_REJECTED:
1137                         FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host,
1138                                 "abort reject recd. id %d\n",
1139                                 (int)(id & FNIC_TAG_MASK));
1140                         break;
1141                 case FCPIO_IO_NOT_FOUND:
1142                         if (CMD_FLAGS(sc) & FNIC_IO_ABTS_ISSUED)
1143                                 atomic64_inc(&abts_stats->abort_io_not_found);
1144                         else
1145                                 atomic64_inc(
1146                                         &term_stats->terminate_io_not_found);
1147                         break;
1148                 default:
1149                         if (CMD_FLAGS(sc) & FNIC_IO_ABTS_ISSUED)
1150                                 atomic64_inc(&abts_stats->abort_failures);
1151                         else
1152                                 atomic64_inc(
1153                                         &term_stats->terminate_failures);
1154                         break;
1155                 }
1156                 if (CMD_STATE(sc) != FNIC_IOREQ_ABTS_PENDING) {
1157                         /* This is a late completion. Ignore it */
1158                         spin_unlock_irqrestore(io_lock, flags);
1159                         return;
1160                 }
1161
1162                 CMD_FLAGS(sc) |= FNIC_IO_ABT_TERM_DONE;
1163                 CMD_ABTS_STATUS(sc) = hdr_status;
1164
1165                 /* If the status is IO not found consider it as success */
1166                 if (hdr_status == FCPIO_IO_NOT_FOUND)
1167                         CMD_ABTS_STATUS(sc) = FCPIO_SUCCESS;
1168
1169                 if (!(CMD_FLAGS(sc) & (FNIC_IO_ABORTED | FNIC_IO_DONE)))
1170                         atomic64_inc(&misc_stats->no_icmnd_itmf_cmpls);
1171
1172                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1173                               "abts cmpl recd. id %d status %s\n",
1174                               (int)(id & FNIC_TAG_MASK),
1175                               fnic_fcpio_status_to_str(hdr_status));
1176
1177                 /*
1178                  * If scsi_eh thread is blocked waiting for abts to complete,
1179                  * signal completion to it. IO will be cleaned in the thread
1180                  * else clean it in this context
1181                  */
1182                 if (io_req->abts_done) {
1183                         complete(io_req->abts_done);
1184                         spin_unlock_irqrestore(io_lock, flags);
1185                 } else {
1186                         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1187                                       "abts cmpl, completing IO\n");
1188                         CMD_SP(sc) = NULL;
1189                         sc->result = (DID_ERROR << 16);
1190
1191                         spin_unlock_irqrestore(io_lock, flags);
1192
1193                         fnic_release_ioreq_buf(fnic, io_req, sc);
1194                         mempool_free(io_req, fnic->io_req_pool);
1195                         if (sc->scsi_done) {
1196                                 FNIC_TRACE(fnic_fcpio_itmf_cmpl_handler,
1197                                         sc->device->host->host_no, id,
1198                                         sc,
1199                                         jiffies_to_msecs(jiffies - start_time),
1200                                         desc,
1201                                         (((u64)hdr_status << 40) |
1202                                         (u64)sc->cmnd[0] << 32 |
1203                                         (u64)sc->cmnd[2] << 24 |
1204                                         (u64)sc->cmnd[3] << 16 |
1205                                         (u64)sc->cmnd[4] << 8 | sc->cmnd[5]),
1206                                         (((u64)CMD_FLAGS(sc) << 32) |
1207                                         CMD_STATE(sc)));
1208                                 sc->scsi_done(sc);
1209                                 atomic64_dec(&fnic_stats->io_stats.active_ios);
1210                                 if (atomic64_read(&fnic->io_cmpl_skip))
1211                                         atomic64_dec(&fnic->io_cmpl_skip);
1212                                 else
1213                                         atomic64_inc(&fnic_stats->io_stats.io_completions);
1214                         }
1215                 }
1216
1217         } else if (id & FNIC_TAG_DEV_RST) {
1218                 /* Completion of device reset */
1219                 CMD_LR_STATUS(sc) = hdr_status;
1220                 if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING) {
1221                         spin_unlock_irqrestore(io_lock, flags);
1222                         CMD_FLAGS(sc) |= FNIC_DEV_RST_ABTS_PENDING;
1223                         FNIC_TRACE(fnic_fcpio_itmf_cmpl_handler,
1224                                   sc->device->host->host_no, id, sc,
1225                                   jiffies_to_msecs(jiffies - start_time),
1226                                   desc, 0,
1227                                   (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc)));
1228                         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1229                                 "Terminate pending "
1230                                 "dev reset cmpl recd. id %d status %s\n",
1231                                 (int)(id & FNIC_TAG_MASK),
1232                                 fnic_fcpio_status_to_str(hdr_status));
1233                         return;
1234                 }
1235                 if (CMD_FLAGS(sc) & FNIC_DEV_RST_TIMED_OUT) {
1236                         /* Need to wait for terminate completion */
1237                         spin_unlock_irqrestore(io_lock, flags);
1238                         FNIC_TRACE(fnic_fcpio_itmf_cmpl_handler,
1239                                   sc->device->host->host_no, id, sc,
1240                                   jiffies_to_msecs(jiffies - start_time),
1241                                   desc, 0,
1242                                   (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc)));
1243                         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1244                                 "dev reset cmpl recd after time out. "
1245                                 "id %d status %s\n",
1246                                 (int)(id & FNIC_TAG_MASK),
1247                                 fnic_fcpio_status_to_str(hdr_status));
1248                         return;
1249                 }
1250                 CMD_STATE(sc) = FNIC_IOREQ_CMD_COMPLETE;
1251                 CMD_FLAGS(sc) |= FNIC_DEV_RST_DONE;
1252                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1253                               "dev reset cmpl recd. id %d status %s\n",
1254                               (int)(id & FNIC_TAG_MASK),
1255                               fnic_fcpio_status_to_str(hdr_status));
1256                 if (io_req->dr_done)
1257                         complete(io_req->dr_done);
1258                 spin_unlock_irqrestore(io_lock, flags);
1259
1260         } else {
1261                 shost_printk(KERN_ERR, fnic->lport->host,
1262                              "Unexpected itmf io state %s tag %x\n",
1263                              fnic_ioreq_state_to_str(CMD_STATE(sc)), id);
1264                 spin_unlock_irqrestore(io_lock, flags);
1265         }
1266
1267 }
1268
1269 /*
1270  * fnic_fcpio_cmpl_handler
1271  * Routine to service the cq for wq_copy
1272  */
1273 static int fnic_fcpio_cmpl_handler(struct vnic_dev *vdev,
1274                                    unsigned int cq_index,
1275                                    struct fcpio_fw_req *desc)
1276 {
1277         struct fnic *fnic = vnic_dev_priv(vdev);
1278
1279         switch (desc->hdr.type) {
1280         case FCPIO_ICMND_CMPL: /* fw completed a command */
1281         case FCPIO_ITMF_CMPL: /* fw completed itmf (abort cmd, lun reset)*/
1282         case FCPIO_FLOGI_REG_CMPL: /* fw completed flogi_reg */
1283         case FCPIO_FLOGI_FIP_REG_CMPL: /* fw completed flogi_fip_reg */
1284         case FCPIO_RESET_CMPL: /* fw completed reset */
1285                 atomic64_dec(&fnic->fnic_stats.fw_stats.active_fw_reqs);
1286                 break;
1287         default:
1288                 break;
1289         }
1290
1291         switch (desc->hdr.type) {
1292         case FCPIO_ACK: /* fw copied copy wq desc to its queue */
1293                 fnic_fcpio_ack_handler(fnic, cq_index, desc);
1294                 break;
1295
1296         case FCPIO_ICMND_CMPL: /* fw completed a command */
1297                 fnic_fcpio_icmnd_cmpl_handler(fnic, desc);
1298                 break;
1299
1300         case FCPIO_ITMF_CMPL: /* fw completed itmf (abort cmd, lun reset)*/
1301                 fnic_fcpio_itmf_cmpl_handler(fnic, desc);
1302                 break;
1303
1304         case FCPIO_FLOGI_REG_CMPL: /* fw completed flogi_reg */
1305         case FCPIO_FLOGI_FIP_REG_CMPL: /* fw completed flogi_fip_reg */
1306                 fnic_fcpio_flogi_reg_cmpl_handler(fnic, desc);
1307                 break;
1308
1309         case FCPIO_RESET_CMPL: /* fw completed reset */
1310                 fnic_fcpio_fw_reset_cmpl_handler(fnic, desc);
1311                 break;
1312
1313         default:
1314                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1315                               "firmware completion type %d\n",
1316                               desc->hdr.type);
1317                 break;
1318         }
1319
1320         return 0;
1321 }
1322
1323 /*
1324  * fnic_wq_copy_cmpl_handler
1325  * Routine to process wq copy
1326  */
1327 int fnic_wq_copy_cmpl_handler(struct fnic *fnic, int copy_work_to_do)
1328 {
1329         unsigned int wq_work_done = 0;
1330         unsigned int i, cq_index;
1331         unsigned int cur_work_done;
1332         struct misc_stats *misc_stats = &fnic->fnic_stats.misc_stats;
1333         u64 start_jiffies = 0;
1334         u64 end_jiffies = 0;
1335         u64 delta_jiffies = 0;
1336         u64 delta_ms = 0;
1337
1338         for (i = 0; i < fnic->wq_copy_count; i++) {
1339                 cq_index = i + fnic->raw_wq_count + fnic->rq_count;
1340
1341                 start_jiffies = jiffies;
1342                 cur_work_done = vnic_cq_copy_service(&fnic->cq[cq_index],
1343                                                      fnic_fcpio_cmpl_handler,
1344                                                      copy_work_to_do);
1345                 end_jiffies = jiffies;
1346
1347                 wq_work_done += cur_work_done;
1348                 delta_jiffies = end_jiffies - start_jiffies;
1349                 if (delta_jiffies >
1350                         (u64) atomic64_read(&misc_stats->max_isr_jiffies)) {
1351                         atomic64_set(&misc_stats->max_isr_jiffies,
1352                                         delta_jiffies);
1353                         delta_ms = jiffies_to_msecs(delta_jiffies);
1354                         atomic64_set(&misc_stats->max_isr_time_ms, delta_ms);
1355                         atomic64_set(&misc_stats->corr_work_done,
1356                                         cur_work_done);
1357                 }
1358         }
1359         return wq_work_done;
1360 }
1361
1362 static void fnic_cleanup_io(struct fnic *fnic, int exclude_id)
1363 {
1364         int i;
1365         struct fnic_io_req *io_req;
1366         unsigned long flags = 0;
1367         struct scsi_cmnd *sc;
1368         spinlock_t *io_lock;
1369         unsigned long start_time = 0;
1370         struct fnic_stats *fnic_stats = &fnic->fnic_stats;
1371
1372         for (i = 0; i < fnic->fnic_max_tag_id; i++) {
1373                 if (i == exclude_id)
1374                         continue;
1375
1376                 io_lock = fnic_io_lock_tag(fnic, i);
1377                 spin_lock_irqsave(io_lock, flags);
1378                 sc = scsi_host_find_tag(fnic->lport->host, i);
1379                 if (!sc) {
1380                         spin_unlock_irqrestore(io_lock, flags);
1381                         continue;
1382                 }
1383
1384                 io_req = (struct fnic_io_req *)CMD_SP(sc);
1385                 if ((CMD_FLAGS(sc) & FNIC_DEVICE_RESET) &&
1386                         !(CMD_FLAGS(sc) & FNIC_DEV_RST_DONE)) {
1387                         /*
1388                          * We will be here only when FW completes reset
1389                          * without sending completions for outstanding ios.
1390                          */
1391                         CMD_FLAGS(sc) |= FNIC_DEV_RST_DONE;
1392                         if (io_req && io_req->dr_done)
1393                                 complete(io_req->dr_done);
1394                         else if (io_req && io_req->abts_done)
1395                                 complete(io_req->abts_done);
1396                         spin_unlock_irqrestore(io_lock, flags);
1397                         continue;
1398                 } else if (CMD_FLAGS(sc) & FNIC_DEVICE_RESET) {
1399                         spin_unlock_irqrestore(io_lock, flags);
1400                         continue;
1401                 }
1402                 if (!io_req) {
1403                         spin_unlock_irqrestore(io_lock, flags);
1404                         goto cleanup_scsi_cmd;
1405                 }
1406
1407                 CMD_SP(sc) = NULL;
1408
1409                 spin_unlock_irqrestore(io_lock, flags);
1410
1411                 /*
1412                  * If there is a scsi_cmnd associated with this io_req, then
1413                  * free the corresponding state
1414                  */
1415                 start_time = io_req->start_time;
1416                 fnic_release_ioreq_buf(fnic, io_req, sc);
1417                 mempool_free(io_req, fnic->io_req_pool);
1418
1419 cleanup_scsi_cmd:
1420                 sc->result = DID_TRANSPORT_DISRUPTED << 16;
1421                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1422                               "%s: tag:0x%x : sc:0x%p duration = %lu DID_TRANSPORT_DISRUPTED\n",
1423                               __func__, sc->request->tag, sc,
1424                               (jiffies - start_time));
1425
1426                 if (atomic64_read(&fnic->io_cmpl_skip))
1427                         atomic64_dec(&fnic->io_cmpl_skip);
1428                 else
1429                         atomic64_inc(&fnic_stats->io_stats.io_completions);
1430
1431                 /* Complete the command to SCSI */
1432                 if (sc->scsi_done) {
1433                         if (!(CMD_FLAGS(sc) & FNIC_IO_ISSUED))
1434                                 shost_printk(KERN_ERR, fnic->lport->host,
1435                                 "Calling done for IO not issued to fw: tag:0x%x sc:0x%p\n",
1436                                  sc->request->tag, sc);
1437
1438                         FNIC_TRACE(fnic_cleanup_io,
1439                                   sc->device->host->host_no, i, sc,
1440                                   jiffies_to_msecs(jiffies - start_time),
1441                                   0, ((u64)sc->cmnd[0] << 32 |
1442                                   (u64)sc->cmnd[2] << 24 |
1443                                   (u64)sc->cmnd[3] << 16 |
1444                                   (u64)sc->cmnd[4] << 8 | sc->cmnd[5]),
1445                                   (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc)));
1446
1447                         sc->scsi_done(sc);
1448                 }
1449         }
1450 }
1451
1452 void fnic_wq_copy_cleanup_handler(struct vnic_wq_copy *wq,
1453                                   struct fcpio_host_req *desc)
1454 {
1455         u32 id;
1456         struct fnic *fnic = vnic_dev_priv(wq->vdev);
1457         struct fnic_io_req *io_req;
1458         struct scsi_cmnd *sc;
1459         unsigned long flags;
1460         spinlock_t *io_lock;
1461         unsigned long start_time = 0;
1462
1463         /* get the tag reference */
1464         fcpio_tag_id_dec(&desc->hdr.tag, &id);
1465         id &= FNIC_TAG_MASK;
1466
1467         if (id >= fnic->fnic_max_tag_id)
1468                 return;
1469
1470         sc = scsi_host_find_tag(fnic->lport->host, id);
1471         if (!sc)
1472                 return;
1473
1474         io_lock = fnic_io_lock_hash(fnic, sc);
1475         spin_lock_irqsave(io_lock, flags);
1476
1477         /* Get the IO context which this desc refers to */
1478         io_req = (struct fnic_io_req *)CMD_SP(sc);
1479
1480         /* fnic interrupts are turned off by now */
1481
1482         if (!io_req) {
1483                 spin_unlock_irqrestore(io_lock, flags);
1484                 goto wq_copy_cleanup_scsi_cmd;
1485         }
1486
1487         CMD_SP(sc) = NULL;
1488
1489         spin_unlock_irqrestore(io_lock, flags);
1490
1491         start_time = io_req->start_time;
1492         fnic_release_ioreq_buf(fnic, io_req, sc);
1493         mempool_free(io_req, fnic->io_req_pool);
1494
1495 wq_copy_cleanup_scsi_cmd:
1496         sc->result = DID_NO_CONNECT << 16;
1497         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host, "wq_copy_cleanup_handler:"
1498                       " DID_NO_CONNECT\n");
1499
1500         if (sc->scsi_done) {
1501                 FNIC_TRACE(fnic_wq_copy_cleanup_handler,
1502                           sc->device->host->host_no, id, sc,
1503                           jiffies_to_msecs(jiffies - start_time),
1504                           0, ((u64)sc->cmnd[0] << 32 |
1505                           (u64)sc->cmnd[2] << 24 | (u64)sc->cmnd[3] << 16 |
1506                           (u64)sc->cmnd[4] << 8 | sc->cmnd[5]),
1507                           (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc)));
1508
1509                 sc->scsi_done(sc);
1510         }
1511 }
1512
1513 static inline int fnic_queue_abort_io_req(struct fnic *fnic, int tag,
1514                                           u32 task_req, u8 *fc_lun,
1515                                           struct fnic_io_req *io_req)
1516 {
1517         struct vnic_wq_copy *wq = &fnic->wq_copy[0];
1518         struct Scsi_Host *host = fnic->lport->host;
1519         struct misc_stats *misc_stats = &fnic->fnic_stats.misc_stats;
1520         unsigned long flags;
1521
1522         spin_lock_irqsave(host->host_lock, flags);
1523         if (unlikely(fnic_chk_state_flags_locked(fnic,
1524                                                 FNIC_FLAGS_IO_BLOCKED))) {
1525                 spin_unlock_irqrestore(host->host_lock, flags);
1526                 return 1;
1527         } else
1528                 atomic_inc(&fnic->in_flight);
1529         spin_unlock_irqrestore(host->host_lock, flags);
1530
1531         spin_lock_irqsave(&fnic->wq_copy_lock[0], flags);
1532
1533         if (vnic_wq_copy_desc_avail(wq) <= fnic->wq_copy_desc_low[0])
1534                 free_wq_copy_descs(fnic, wq);
1535
1536         if (!vnic_wq_copy_desc_avail(wq)) {
1537                 spin_unlock_irqrestore(&fnic->wq_copy_lock[0], flags);
1538                 atomic_dec(&fnic->in_flight);
1539                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1540                         "fnic_queue_abort_io_req: failure: no descriptors\n");
1541                 atomic64_inc(&misc_stats->abts_cpwq_alloc_failures);
1542                 return 1;
1543         }
1544         fnic_queue_wq_copy_desc_itmf(wq, tag | FNIC_TAG_ABORT,
1545                                      0, task_req, tag, fc_lun, io_req->port_id,
1546                                      fnic->config.ra_tov, fnic->config.ed_tov);
1547
1548         atomic64_inc(&fnic->fnic_stats.fw_stats.active_fw_reqs);
1549         if (atomic64_read(&fnic->fnic_stats.fw_stats.active_fw_reqs) >
1550                   atomic64_read(&fnic->fnic_stats.fw_stats.max_fw_reqs))
1551                 atomic64_set(&fnic->fnic_stats.fw_stats.max_fw_reqs,
1552                   atomic64_read(&fnic->fnic_stats.fw_stats.active_fw_reqs));
1553
1554         spin_unlock_irqrestore(&fnic->wq_copy_lock[0], flags);
1555         atomic_dec(&fnic->in_flight);
1556
1557         return 0;
1558 }
1559
1560 static void fnic_rport_exch_reset(struct fnic *fnic, u32 port_id)
1561 {
1562         int tag;
1563         int abt_tag;
1564         int term_cnt = 0;
1565         struct fnic_io_req *io_req;
1566         spinlock_t *io_lock;
1567         unsigned long flags;
1568         struct scsi_cmnd *sc;
1569         struct reset_stats *reset_stats = &fnic->fnic_stats.reset_stats;
1570         struct terminate_stats *term_stats = &fnic->fnic_stats.term_stats;
1571         struct scsi_lun fc_lun;
1572         enum fnic_ioreq_state old_ioreq_state;
1573
1574         FNIC_SCSI_DBG(KERN_DEBUG,
1575                       fnic->lport->host,
1576                       "fnic_rport_exch_reset called portid 0x%06x\n",
1577                       port_id);
1578
1579         if (fnic->in_remove)
1580                 return;
1581
1582         for (tag = 0; tag < fnic->fnic_max_tag_id; tag++) {
1583                 abt_tag = tag;
1584                 io_lock = fnic_io_lock_tag(fnic, tag);
1585                 spin_lock_irqsave(io_lock, flags);
1586                 sc = scsi_host_find_tag(fnic->lport->host, tag);
1587                 if (!sc) {
1588                         spin_unlock_irqrestore(io_lock, flags);
1589                         continue;
1590                 }
1591
1592                 io_req = (struct fnic_io_req *)CMD_SP(sc);
1593
1594                 if (!io_req || io_req->port_id != port_id) {
1595                         spin_unlock_irqrestore(io_lock, flags);
1596                         continue;
1597                 }
1598
1599                 if ((CMD_FLAGS(sc) & FNIC_DEVICE_RESET) &&
1600                         (!(CMD_FLAGS(sc) & FNIC_DEV_RST_ISSUED))) {
1601                         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1602                         "fnic_rport_exch_reset dev rst not pending sc 0x%p\n",
1603                         sc);
1604                         spin_unlock_irqrestore(io_lock, flags);
1605                         continue;
1606                 }
1607
1608                 /*
1609                  * Found IO that is still pending with firmware and
1610                  * belongs to rport that went away
1611                  */
1612                 if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING) {
1613                         spin_unlock_irqrestore(io_lock, flags);
1614                         continue;
1615                 }
1616                 if (io_req->abts_done) {
1617                         shost_printk(KERN_ERR, fnic->lport->host,
1618                         "fnic_rport_exch_reset: io_req->abts_done is set "
1619                         "state is %s\n",
1620                         fnic_ioreq_state_to_str(CMD_STATE(sc)));
1621                 }
1622
1623                 if (!(CMD_FLAGS(sc) & FNIC_IO_ISSUED)) {
1624                         shost_printk(KERN_ERR, fnic->lport->host,
1625                                   "rport_exch_reset "
1626                                   "IO not yet issued %p tag 0x%x flags "
1627                                   "%x state %d\n",
1628                                   sc, tag, CMD_FLAGS(sc), CMD_STATE(sc));
1629                 }
1630                 old_ioreq_state = CMD_STATE(sc);
1631                 CMD_STATE(sc) = FNIC_IOREQ_ABTS_PENDING;
1632                 CMD_ABTS_STATUS(sc) = FCPIO_INVALID_CODE;
1633                 if (CMD_FLAGS(sc) & FNIC_DEVICE_RESET) {
1634                         atomic64_inc(&reset_stats->device_reset_terminates);
1635                         abt_tag = (tag | FNIC_TAG_DEV_RST);
1636                         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1637                         "fnic_rport_exch_reset dev rst sc 0x%p\n",
1638                         sc);
1639                 }
1640
1641                 BUG_ON(io_req->abts_done);
1642
1643                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1644                               "fnic_rport_reset_exch: Issuing abts\n");
1645
1646                 spin_unlock_irqrestore(io_lock, flags);
1647
1648                 /* Now queue the abort command to firmware */
1649                 int_to_scsilun(sc->device->lun, &fc_lun);
1650
1651                 if (fnic_queue_abort_io_req(fnic, abt_tag,
1652                                             FCPIO_ITMF_ABT_TASK_TERM,
1653                                             fc_lun.scsi_lun, io_req)) {
1654                         /*
1655                          * Revert the cmd state back to old state, if
1656                          * it hasn't changed in between. This cmd will get
1657                          * aborted later by scsi_eh, or cleaned up during
1658                          * lun reset
1659                          */
1660                         spin_lock_irqsave(io_lock, flags);
1661                         if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING)
1662                                 CMD_STATE(sc) = old_ioreq_state;
1663                         spin_unlock_irqrestore(io_lock, flags);
1664                 } else {
1665                         spin_lock_irqsave(io_lock, flags);
1666                         if (CMD_FLAGS(sc) & FNIC_DEVICE_RESET)
1667                                 CMD_FLAGS(sc) |= FNIC_DEV_RST_TERM_ISSUED;
1668                         else
1669                                 CMD_FLAGS(sc) |= FNIC_IO_INTERNAL_TERM_ISSUED;
1670                         spin_unlock_irqrestore(io_lock, flags);
1671                         atomic64_inc(&term_stats->terminates);
1672                         term_cnt++;
1673                 }
1674         }
1675         if (term_cnt > atomic64_read(&term_stats->max_terminates))
1676                 atomic64_set(&term_stats->max_terminates, term_cnt);
1677
1678 }
1679
1680 void fnic_terminate_rport_io(struct fc_rport *rport)
1681 {
1682         int tag;
1683         int abt_tag;
1684         int term_cnt = 0;
1685         struct fnic_io_req *io_req;
1686         spinlock_t *io_lock;
1687         unsigned long flags;
1688         struct scsi_cmnd *sc;
1689         struct scsi_lun fc_lun;
1690         struct fc_rport_libfc_priv *rdata;
1691         struct fc_lport *lport;
1692         struct fnic *fnic;
1693         struct fc_rport *cmd_rport;
1694         struct reset_stats *reset_stats;
1695         struct terminate_stats *term_stats;
1696         enum fnic_ioreq_state old_ioreq_state;
1697
1698         if (!rport) {
1699                 printk(KERN_ERR "fnic_terminate_rport_io: rport is NULL\n");
1700                 return;
1701         }
1702         rdata = rport->dd_data;
1703
1704         if (!rdata) {
1705                 printk(KERN_ERR "fnic_terminate_rport_io: rdata is NULL\n");
1706                 return;
1707         }
1708         lport = rdata->local_port;
1709
1710         if (!lport) {
1711                 printk(KERN_ERR "fnic_terminate_rport_io: lport is NULL\n");
1712                 return;
1713         }
1714         fnic = lport_priv(lport);
1715         FNIC_SCSI_DBG(KERN_DEBUG,
1716                       fnic->lport->host, "fnic_terminate_rport_io called"
1717                       " wwpn 0x%llx, wwnn0x%llx, rport 0x%p, portid 0x%06x\n",
1718                       rport->port_name, rport->node_name, rport,
1719                       rport->port_id);
1720
1721         if (fnic->in_remove)
1722                 return;
1723
1724         reset_stats = &fnic->fnic_stats.reset_stats;
1725         term_stats = &fnic->fnic_stats.term_stats;
1726
1727         for (tag = 0; tag < fnic->fnic_max_tag_id; tag++) {
1728                 abt_tag = tag;
1729                 io_lock = fnic_io_lock_tag(fnic, tag);
1730                 spin_lock_irqsave(io_lock, flags);
1731                 sc = scsi_host_find_tag(fnic->lport->host, tag);
1732                 if (!sc) {
1733                         spin_unlock_irqrestore(io_lock, flags);
1734                         continue;
1735                 }
1736
1737                 cmd_rport = starget_to_rport(scsi_target(sc->device));
1738                 if (rport != cmd_rport) {
1739                         spin_unlock_irqrestore(io_lock, flags);
1740                         continue;
1741                 }
1742
1743                 io_req = (struct fnic_io_req *)CMD_SP(sc);
1744
1745                 if (!io_req || rport != cmd_rport) {
1746                         spin_unlock_irqrestore(io_lock, flags);
1747                         continue;
1748                 }
1749
1750                 if ((CMD_FLAGS(sc) & FNIC_DEVICE_RESET) &&
1751                         (!(CMD_FLAGS(sc) & FNIC_DEV_RST_ISSUED))) {
1752                         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1753                         "fnic_terminate_rport_io dev rst not pending sc 0x%p\n",
1754                         sc);
1755                         spin_unlock_irqrestore(io_lock, flags);
1756                         continue;
1757                 }
1758                 /*
1759                  * Found IO that is still pending with firmware and
1760                  * belongs to rport that went away
1761                  */
1762                 if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING) {
1763                         spin_unlock_irqrestore(io_lock, flags);
1764                         continue;
1765                 }
1766                 if (io_req->abts_done) {
1767                         shost_printk(KERN_ERR, fnic->lport->host,
1768                         "fnic_terminate_rport_io: io_req->abts_done is set "
1769                         "state is %s\n",
1770                         fnic_ioreq_state_to_str(CMD_STATE(sc)));
1771                 }
1772                 if (!(CMD_FLAGS(sc) & FNIC_IO_ISSUED)) {
1773                         FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host,
1774                                   "fnic_terminate_rport_io "
1775                                   "IO not yet issued %p tag 0x%x flags "
1776                                   "%x state %d\n",
1777                                   sc, tag, CMD_FLAGS(sc), CMD_STATE(sc));
1778                 }
1779                 old_ioreq_state = CMD_STATE(sc);
1780                 CMD_STATE(sc) = FNIC_IOREQ_ABTS_PENDING;
1781                 CMD_ABTS_STATUS(sc) = FCPIO_INVALID_CODE;
1782                 if (CMD_FLAGS(sc) & FNIC_DEVICE_RESET) {
1783                         atomic64_inc(&reset_stats->device_reset_terminates);
1784                         abt_tag = (tag | FNIC_TAG_DEV_RST);
1785                         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1786                         "fnic_terminate_rport_io dev rst sc 0x%p\n", sc);
1787                 }
1788
1789                 BUG_ON(io_req->abts_done);
1790
1791                 FNIC_SCSI_DBG(KERN_DEBUG,
1792                               fnic->lport->host,
1793                               "fnic_terminate_rport_io: Issuing abts\n");
1794
1795                 spin_unlock_irqrestore(io_lock, flags);
1796
1797                 /* Now queue the abort command to firmware */
1798                 int_to_scsilun(sc->device->lun, &fc_lun);
1799
1800                 if (fnic_queue_abort_io_req(fnic, abt_tag,
1801                                             FCPIO_ITMF_ABT_TASK_TERM,
1802                                             fc_lun.scsi_lun, io_req)) {
1803                         /*
1804                          * Revert the cmd state back to old state, if
1805                          * it hasn't changed in between. This cmd will get
1806                          * aborted later by scsi_eh, or cleaned up during
1807                          * lun reset
1808                          */
1809                         spin_lock_irqsave(io_lock, flags);
1810                         if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING)
1811                                 CMD_STATE(sc) = old_ioreq_state;
1812                         spin_unlock_irqrestore(io_lock, flags);
1813                 } else {
1814                         spin_lock_irqsave(io_lock, flags);
1815                         if (CMD_FLAGS(sc) & FNIC_DEVICE_RESET)
1816                                 CMD_FLAGS(sc) |= FNIC_DEV_RST_TERM_ISSUED;
1817                         else
1818                                 CMD_FLAGS(sc) |= FNIC_IO_INTERNAL_TERM_ISSUED;
1819                         spin_unlock_irqrestore(io_lock, flags);
1820                         atomic64_inc(&term_stats->terminates);
1821                         term_cnt++;
1822                 }
1823         }
1824         if (term_cnt > atomic64_read(&term_stats->max_terminates))
1825                 atomic64_set(&term_stats->max_terminates, term_cnt);
1826
1827 }
1828
1829 /*
1830  * This function is exported to SCSI for sending abort cmnds.
1831  * A SCSI IO is represented by a io_req in the driver.
1832  * The ioreq is linked to the SCSI Cmd, thus a link with the ULP's IO.
1833  */
1834 int fnic_abort_cmd(struct scsi_cmnd *sc)
1835 {
1836         struct fc_lport *lp;
1837         struct fnic *fnic;
1838         struct fnic_io_req *io_req = NULL;
1839         struct fc_rport *rport;
1840         spinlock_t *io_lock;
1841         unsigned long flags;
1842         unsigned long start_time = 0;
1843         int ret = SUCCESS;
1844         u32 task_req = 0;
1845         struct scsi_lun fc_lun;
1846         struct fnic_stats *fnic_stats;
1847         struct abort_stats *abts_stats;
1848         struct terminate_stats *term_stats;
1849         enum fnic_ioreq_state old_ioreq_state;
1850         int tag;
1851         unsigned long abt_issued_time;
1852         DECLARE_COMPLETION_ONSTACK(tm_done);
1853
1854         /* Wait for rport to unblock */
1855         fc_block_scsi_eh(sc);
1856
1857         /* Get local-port, check ready and link up */
1858         lp = shost_priv(sc->device->host);
1859
1860         fnic = lport_priv(lp);
1861         fnic_stats = &fnic->fnic_stats;
1862         abts_stats = &fnic->fnic_stats.abts_stats;
1863         term_stats = &fnic->fnic_stats.term_stats;
1864
1865         rport = starget_to_rport(scsi_target(sc->device));
1866         tag = sc->request->tag;
1867         FNIC_SCSI_DBG(KERN_DEBUG,
1868                 fnic->lport->host,
1869                 "Abort Cmd called FCID 0x%x, LUN 0x%llx TAG %x flags %x\n",
1870                 rport->port_id, sc->device->lun, tag, CMD_FLAGS(sc));
1871
1872         CMD_FLAGS(sc) = FNIC_NO_FLAGS;
1873
1874         if (lp->state != LPORT_ST_READY || !(lp->link_up)) {
1875                 ret = FAILED;
1876                 goto fnic_abort_cmd_end;
1877         }
1878
1879         /*
1880          * Avoid a race between SCSI issuing the abort and the device
1881          * completing the command.
1882          *
1883          * If the command is already completed by the fw cmpl code,
1884          * we just return SUCCESS from here. This means that the abort
1885          * succeeded. In the SCSI ML, since the timeout for command has
1886          * happened, the completion wont actually complete the command
1887          * and it will be considered as an aborted command
1888          *
1889          * The CMD_SP will not be cleared except while holding io_req_lock.
1890          */
1891         io_lock = fnic_io_lock_hash(fnic, sc);
1892         spin_lock_irqsave(io_lock, flags);
1893         io_req = (struct fnic_io_req *)CMD_SP(sc);
1894         if (!io_req) {
1895                 spin_unlock_irqrestore(io_lock, flags);
1896                 goto fnic_abort_cmd_end;
1897         }
1898
1899         io_req->abts_done = &tm_done;
1900
1901         if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING) {
1902                 spin_unlock_irqrestore(io_lock, flags);
1903                 goto wait_pending;
1904         }
1905
1906         abt_issued_time = jiffies_to_msecs(jiffies) - jiffies_to_msecs(io_req->start_time);
1907         if (abt_issued_time <= 6000)
1908                 atomic64_inc(&abts_stats->abort_issued_btw_0_to_6_sec);
1909         else if (abt_issued_time > 6000 && abt_issued_time <= 20000)
1910                 atomic64_inc(&abts_stats->abort_issued_btw_6_to_20_sec);
1911         else if (abt_issued_time > 20000 && abt_issued_time <= 30000)
1912                 atomic64_inc(&abts_stats->abort_issued_btw_20_to_30_sec);
1913         else if (abt_issued_time > 30000 && abt_issued_time <= 40000)
1914                 atomic64_inc(&abts_stats->abort_issued_btw_30_to_40_sec);
1915         else if (abt_issued_time > 40000 && abt_issued_time <= 50000)
1916                 atomic64_inc(&abts_stats->abort_issued_btw_40_to_50_sec);
1917         else if (abt_issued_time > 50000 && abt_issued_time <= 60000)
1918                 atomic64_inc(&abts_stats->abort_issued_btw_50_to_60_sec);
1919         else
1920                 atomic64_inc(&abts_stats->abort_issued_greater_than_60_sec);
1921
1922         FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host,
1923                 "CBD Opcode: %02x Abort issued time: %lu msec\n", sc->cmnd[0], abt_issued_time);
1924         /*
1925          * Command is still pending, need to abort it
1926          * If the firmware completes the command after this point,
1927          * the completion wont be done till mid-layer, since abort
1928          * has already started.
1929          */
1930         old_ioreq_state = CMD_STATE(sc);
1931         CMD_STATE(sc) = FNIC_IOREQ_ABTS_PENDING;
1932         CMD_ABTS_STATUS(sc) = FCPIO_INVALID_CODE;
1933
1934         spin_unlock_irqrestore(io_lock, flags);
1935
1936         /*
1937          * Check readiness of the remote port. If the path to remote
1938          * port is up, then send abts to the remote port to terminate
1939          * the IO. Else, just locally terminate the IO in the firmware
1940          */
1941         if (fc_remote_port_chkready(rport) == 0)
1942                 task_req = FCPIO_ITMF_ABT_TASK;
1943         else {
1944                 atomic64_inc(&fnic_stats->misc_stats.rport_not_ready);
1945                 task_req = FCPIO_ITMF_ABT_TASK_TERM;
1946         }
1947
1948         /* Now queue the abort command to firmware */
1949         int_to_scsilun(sc->device->lun, &fc_lun);
1950
1951         if (fnic_queue_abort_io_req(fnic, sc->request->tag, task_req,
1952                                     fc_lun.scsi_lun, io_req)) {
1953                 spin_lock_irqsave(io_lock, flags);
1954                 if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING)
1955                         CMD_STATE(sc) = old_ioreq_state;
1956                 io_req = (struct fnic_io_req *)CMD_SP(sc);
1957                 if (io_req)
1958                         io_req->abts_done = NULL;
1959                 spin_unlock_irqrestore(io_lock, flags);
1960                 ret = FAILED;
1961                 goto fnic_abort_cmd_end;
1962         }
1963         if (task_req == FCPIO_ITMF_ABT_TASK) {
1964                 CMD_FLAGS(sc) |= FNIC_IO_ABTS_ISSUED;
1965                 atomic64_inc(&fnic_stats->abts_stats.aborts);
1966         } else {
1967                 CMD_FLAGS(sc) |= FNIC_IO_TERM_ISSUED;
1968                 atomic64_inc(&fnic_stats->term_stats.terminates);
1969         }
1970
1971         /*
1972          * We queued an abort IO, wait for its completion.
1973          * Once the firmware completes the abort command, it will
1974          * wake up this thread.
1975          */
1976  wait_pending:
1977         wait_for_completion_timeout(&tm_done,
1978                                     msecs_to_jiffies
1979                                     (2 * fnic->config.ra_tov +
1980                                      fnic->config.ed_tov));
1981
1982         /* Check the abort status */
1983         spin_lock_irqsave(io_lock, flags);
1984
1985         io_req = (struct fnic_io_req *)CMD_SP(sc);
1986         if (!io_req) {
1987                 atomic64_inc(&fnic_stats->io_stats.ioreq_null);
1988                 spin_unlock_irqrestore(io_lock, flags);
1989                 CMD_FLAGS(sc) |= FNIC_IO_ABT_TERM_REQ_NULL;
1990                 ret = FAILED;
1991                 goto fnic_abort_cmd_end;
1992         }
1993         io_req->abts_done = NULL;
1994
1995         /* fw did not complete abort, timed out */
1996         if (CMD_ABTS_STATUS(sc) == FCPIO_INVALID_CODE) {
1997                 spin_unlock_irqrestore(io_lock, flags);
1998                 if (task_req == FCPIO_ITMF_ABT_TASK) {
1999                         atomic64_inc(&abts_stats->abort_drv_timeouts);
2000                 } else {
2001                         atomic64_inc(&term_stats->terminate_drv_timeouts);
2002                 }
2003                 CMD_FLAGS(sc) |= FNIC_IO_ABT_TERM_TIMED_OUT;
2004                 ret = FAILED;
2005                 goto fnic_abort_cmd_end;
2006         }
2007
2008         /* IO out of order */
2009
2010         if (!(CMD_FLAGS(sc) & (FNIC_IO_ABORTED | FNIC_IO_DONE))) {
2011                 spin_unlock_irqrestore(io_lock, flags);
2012                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2013                         "Issuing Host reset due to out of order IO\n");
2014
2015                 ret = FAILED;
2016                 goto fnic_abort_cmd_end;
2017         }
2018
2019         CMD_STATE(sc) = FNIC_IOREQ_ABTS_COMPLETE;
2020
2021         start_time = io_req->start_time;
2022         /*
2023          * firmware completed the abort, check the status,
2024          * free the io_req if successful. If abort fails,
2025          * Device reset will clean the I/O.
2026          */
2027         if (CMD_ABTS_STATUS(sc) == FCPIO_SUCCESS)
2028                 CMD_SP(sc) = NULL;
2029         else {
2030                 ret = FAILED;
2031                 spin_unlock_irqrestore(io_lock, flags);
2032                 goto fnic_abort_cmd_end;
2033         }
2034
2035         spin_unlock_irqrestore(io_lock, flags);
2036
2037         fnic_release_ioreq_buf(fnic, io_req, sc);
2038         mempool_free(io_req, fnic->io_req_pool);
2039
2040         if (sc->scsi_done) {
2041         /* Call SCSI completion function to complete the IO */
2042                 sc->result = (DID_ABORT << 16);
2043                 sc->scsi_done(sc);
2044                 atomic64_dec(&fnic_stats->io_stats.active_ios);
2045                 if (atomic64_read(&fnic->io_cmpl_skip))
2046                         atomic64_dec(&fnic->io_cmpl_skip);
2047                 else
2048                         atomic64_inc(&fnic_stats->io_stats.io_completions);
2049         }
2050
2051 fnic_abort_cmd_end:
2052         FNIC_TRACE(fnic_abort_cmd, sc->device->host->host_no,
2053                   sc->request->tag, sc,
2054                   jiffies_to_msecs(jiffies - start_time),
2055                   0, ((u64)sc->cmnd[0] << 32 |
2056                   (u64)sc->cmnd[2] << 24 | (u64)sc->cmnd[3] << 16 |
2057                   (u64)sc->cmnd[4] << 8 | sc->cmnd[5]),
2058                   (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc)));
2059
2060         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2061                       "Returning from abort cmd type %x %s\n", task_req,
2062                       (ret == SUCCESS) ?
2063                       "SUCCESS" : "FAILED");
2064         return ret;
2065 }
2066
2067 static inline int fnic_queue_dr_io_req(struct fnic *fnic,
2068                                        struct scsi_cmnd *sc,
2069                                        struct fnic_io_req *io_req)
2070 {
2071         struct vnic_wq_copy *wq = &fnic->wq_copy[0];
2072         struct Scsi_Host *host = fnic->lport->host;
2073         struct misc_stats *misc_stats = &fnic->fnic_stats.misc_stats;
2074         struct scsi_lun fc_lun;
2075         int ret = 0;
2076         unsigned long intr_flags;
2077
2078         spin_lock_irqsave(host->host_lock, intr_flags);
2079         if (unlikely(fnic_chk_state_flags_locked(fnic,
2080                                                 FNIC_FLAGS_IO_BLOCKED))) {
2081                 spin_unlock_irqrestore(host->host_lock, intr_flags);
2082                 return FAILED;
2083         } else
2084                 atomic_inc(&fnic->in_flight);
2085         spin_unlock_irqrestore(host->host_lock, intr_flags);
2086
2087         spin_lock_irqsave(&fnic->wq_copy_lock[0], intr_flags);
2088
2089         if (vnic_wq_copy_desc_avail(wq) <= fnic->wq_copy_desc_low[0])
2090                 free_wq_copy_descs(fnic, wq);
2091
2092         if (!vnic_wq_copy_desc_avail(wq)) {
2093                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2094                           "queue_dr_io_req failure - no descriptors\n");
2095                 atomic64_inc(&misc_stats->devrst_cpwq_alloc_failures);
2096                 ret = -EAGAIN;
2097                 goto lr_io_req_end;
2098         }
2099
2100         /* fill in the lun info */
2101         int_to_scsilun(sc->device->lun, &fc_lun);
2102
2103         fnic_queue_wq_copy_desc_itmf(wq, sc->request->tag | FNIC_TAG_DEV_RST,
2104                                      0, FCPIO_ITMF_LUN_RESET, SCSI_NO_TAG,
2105                                      fc_lun.scsi_lun, io_req->port_id,
2106                                      fnic->config.ra_tov, fnic->config.ed_tov);
2107
2108         atomic64_inc(&fnic->fnic_stats.fw_stats.active_fw_reqs);
2109         if (atomic64_read(&fnic->fnic_stats.fw_stats.active_fw_reqs) >
2110                   atomic64_read(&fnic->fnic_stats.fw_stats.max_fw_reqs))
2111                 atomic64_set(&fnic->fnic_stats.fw_stats.max_fw_reqs,
2112                   atomic64_read(&fnic->fnic_stats.fw_stats.active_fw_reqs));
2113
2114 lr_io_req_end:
2115         spin_unlock_irqrestore(&fnic->wq_copy_lock[0], intr_flags);
2116         atomic_dec(&fnic->in_flight);
2117
2118         return ret;
2119 }
2120
2121 /*
2122  * Clean up any pending aborts on the lun
2123  * For each outstanding IO on this lun, whose abort is not completed by fw,
2124  * issue a local abort. Wait for abort to complete. Return 0 if all commands
2125  * successfully aborted, 1 otherwise
2126  */
2127 static int fnic_clean_pending_aborts(struct fnic *fnic,
2128                                      struct scsi_cmnd *lr_sc,
2129                                          bool new_sc)
2130
2131 {
2132         int tag, abt_tag;
2133         struct fnic_io_req *io_req;
2134         spinlock_t *io_lock;
2135         unsigned long flags;
2136         int ret = 0;
2137         struct scsi_cmnd *sc;
2138         struct scsi_lun fc_lun;
2139         struct scsi_device *lun_dev = lr_sc->device;
2140         DECLARE_COMPLETION_ONSTACK(tm_done);
2141         enum fnic_ioreq_state old_ioreq_state;
2142
2143         for (tag = 0; tag < fnic->fnic_max_tag_id; tag++) {
2144                 io_lock = fnic_io_lock_tag(fnic, tag);
2145                 spin_lock_irqsave(io_lock, flags);
2146                 sc = scsi_host_find_tag(fnic->lport->host, tag);
2147                 /*
2148                  * ignore this lun reset cmd if issued using new SC
2149                  * or cmds that do not belong to this lun
2150                  */
2151                 if (!sc || ((sc == lr_sc) && new_sc) || sc->device != lun_dev) {
2152                         spin_unlock_irqrestore(io_lock, flags);
2153                         continue;
2154                 }
2155
2156                 io_req = (struct fnic_io_req *)CMD_SP(sc);
2157
2158                 if (!io_req || sc->device != lun_dev) {
2159                         spin_unlock_irqrestore(io_lock, flags);
2160                         continue;
2161                 }
2162
2163                 /*
2164                  * Found IO that is still pending with firmware and
2165                  * belongs to the LUN that we are resetting
2166                  */
2167                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2168                               "Found IO in %s on lun\n",
2169                               fnic_ioreq_state_to_str(CMD_STATE(sc)));
2170
2171                 if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING) {
2172                         spin_unlock_irqrestore(io_lock, flags);
2173                         continue;
2174                 }
2175                 if ((CMD_FLAGS(sc) & FNIC_DEVICE_RESET) &&
2176                         (!(CMD_FLAGS(sc) & FNIC_DEV_RST_ISSUED))) {
2177                         FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host,
2178                                 "%s dev rst not pending sc 0x%p\n", __func__,
2179                                 sc);
2180                         spin_unlock_irqrestore(io_lock, flags);
2181                         continue;
2182                 }
2183
2184                 if (io_req->abts_done)
2185                         shost_printk(KERN_ERR, fnic->lport->host,
2186                           "%s: io_req->abts_done is set state is %s\n",
2187                           __func__, fnic_ioreq_state_to_str(CMD_STATE(sc)));
2188                 old_ioreq_state = CMD_STATE(sc);
2189                 /*
2190                  * Any pending IO issued prior to reset is expected to be
2191                  * in abts pending state, if not we need to set
2192                  * FNIC_IOREQ_ABTS_PENDING to indicate the IO is abort pending.
2193                  * When IO is completed, the IO will be handed over and
2194                  * handled in this function.
2195                  */
2196                 CMD_STATE(sc) = FNIC_IOREQ_ABTS_PENDING;
2197
2198                 BUG_ON(io_req->abts_done);
2199
2200                 abt_tag = tag;
2201                 if (CMD_FLAGS(sc) & FNIC_DEVICE_RESET) {
2202                         abt_tag |= FNIC_TAG_DEV_RST;
2203                         FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host,
2204                                   "%s: dev rst sc 0x%p\n", __func__, sc);
2205                 }
2206
2207                 CMD_ABTS_STATUS(sc) = FCPIO_INVALID_CODE;
2208                 io_req->abts_done = &tm_done;
2209                 spin_unlock_irqrestore(io_lock, flags);
2210
2211                 /* Now queue the abort command to firmware */
2212                 int_to_scsilun(sc->device->lun, &fc_lun);
2213
2214                 if (fnic_queue_abort_io_req(fnic, abt_tag,
2215                                             FCPIO_ITMF_ABT_TASK_TERM,
2216                                             fc_lun.scsi_lun, io_req)) {
2217                         spin_lock_irqsave(io_lock, flags);
2218                         io_req = (struct fnic_io_req *)CMD_SP(sc);
2219                         if (io_req)
2220                                 io_req->abts_done = NULL;
2221                         if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING)
2222                                 CMD_STATE(sc) = old_ioreq_state;
2223                         spin_unlock_irqrestore(io_lock, flags);
2224                         ret = 1;
2225                         goto clean_pending_aborts_end;
2226                 } else {
2227                         spin_lock_irqsave(io_lock, flags);
2228                         if (CMD_FLAGS(sc) & FNIC_DEVICE_RESET)
2229                                 CMD_FLAGS(sc) |= FNIC_DEV_RST_TERM_ISSUED;
2230                         spin_unlock_irqrestore(io_lock, flags);
2231                 }
2232                 CMD_FLAGS(sc) |= FNIC_IO_INTERNAL_TERM_ISSUED;
2233
2234                 wait_for_completion_timeout(&tm_done,
2235                                             msecs_to_jiffies
2236                                             (fnic->config.ed_tov));
2237
2238                 /* Recheck cmd state to check if it is now aborted */
2239                 spin_lock_irqsave(io_lock, flags);
2240                 io_req = (struct fnic_io_req *)CMD_SP(sc);
2241                 if (!io_req) {
2242                         spin_unlock_irqrestore(io_lock, flags);
2243                         CMD_FLAGS(sc) |= FNIC_IO_ABT_TERM_REQ_NULL;
2244                         continue;
2245                 }
2246
2247                 io_req->abts_done = NULL;
2248
2249                 /* if abort is still pending with fw, fail */
2250                 if (CMD_ABTS_STATUS(sc) == FCPIO_INVALID_CODE) {
2251                         spin_unlock_irqrestore(io_lock, flags);
2252                         CMD_FLAGS(sc) |= FNIC_IO_ABT_TERM_DONE;
2253                         ret = 1;
2254                         goto clean_pending_aborts_end;
2255                 }
2256                 CMD_STATE(sc) = FNIC_IOREQ_ABTS_COMPLETE;
2257
2258                 /* original sc used for lr is handled by dev reset code */
2259                 if (sc != lr_sc)
2260                         CMD_SP(sc) = NULL;
2261                 spin_unlock_irqrestore(io_lock, flags);
2262
2263                 /* original sc used for lr is handled by dev reset code */
2264                 if (sc != lr_sc) {
2265                         fnic_release_ioreq_buf(fnic, io_req, sc);
2266                         mempool_free(io_req, fnic->io_req_pool);
2267                 }
2268
2269                 /*
2270                  * Any IO is returned during reset, it needs to call scsi_done
2271                  * to return the scsi_cmnd to upper layer.
2272                  */
2273                 if (sc->scsi_done) {
2274                         /* Set result to let upper SCSI layer retry */
2275                         sc->result = DID_RESET << 16;
2276                         sc->scsi_done(sc);
2277                 }
2278         }
2279
2280         schedule_timeout(msecs_to_jiffies(2 * fnic->config.ed_tov));
2281
2282         /* walk again to check, if IOs are still pending in fw */
2283         if (fnic_is_abts_pending(fnic, lr_sc))
2284                 ret = FAILED;
2285
2286 clean_pending_aborts_end:
2287         return ret;
2288 }
2289
2290 /**
2291  * fnic_scsi_host_start_tag
2292  * Allocates tagid from host's tag list
2293  **/
2294 static inline int
2295 fnic_scsi_host_start_tag(struct fnic *fnic, struct scsi_cmnd *sc)
2296 {
2297         struct request_queue *q = sc->request->q;
2298         struct request *dummy;
2299
2300         dummy = blk_mq_alloc_request(q, REQ_OP_WRITE, BLK_MQ_REQ_NOWAIT);
2301         if (IS_ERR(dummy))
2302                 return SCSI_NO_TAG;
2303
2304         sc->tag = sc->request->tag = dummy->tag;
2305         sc->host_scribble = (unsigned char *)dummy;
2306
2307         return dummy->tag;
2308 }
2309
2310 /**
2311  * fnic_scsi_host_end_tag
2312  * frees tag allocated by fnic_scsi_host_start_tag.
2313  **/
2314 static inline void
2315 fnic_scsi_host_end_tag(struct fnic *fnic, struct scsi_cmnd *sc)
2316 {
2317         struct request *dummy = (struct request *)sc->host_scribble;
2318
2319         blk_mq_free_request(dummy);
2320 }
2321
2322 /*
2323  * SCSI Eh thread issues a Lun Reset when one or more commands on a LUN
2324  * fail to get aborted. It calls driver's eh_device_reset with a SCSI command
2325  * on the LUN.
2326  */
2327 int fnic_device_reset(struct scsi_cmnd *sc)
2328 {
2329         struct fc_lport *lp;
2330         struct fnic *fnic;
2331         struct fnic_io_req *io_req = NULL;
2332         struct fc_rport *rport;
2333         int status;
2334         int ret = FAILED;
2335         spinlock_t *io_lock;
2336         unsigned long flags;
2337         unsigned long start_time = 0;
2338         struct scsi_lun fc_lun;
2339         struct fnic_stats *fnic_stats;
2340         struct reset_stats *reset_stats;
2341         int tag = 0;
2342         DECLARE_COMPLETION_ONSTACK(tm_done);
2343         int tag_gen_flag = 0;   /*to track tags allocated by fnic driver*/
2344         bool new_sc = 0;
2345
2346         /* Wait for rport to unblock */
2347         fc_block_scsi_eh(sc);
2348
2349         /* Get local-port, check ready and link up */
2350         lp = shost_priv(sc->device->host);
2351
2352         fnic = lport_priv(lp);
2353         fnic_stats = &fnic->fnic_stats;
2354         reset_stats = &fnic->fnic_stats.reset_stats;
2355
2356         atomic64_inc(&reset_stats->device_resets);
2357
2358         rport = starget_to_rport(scsi_target(sc->device));
2359         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2360                       "Device reset called FCID 0x%x, LUN 0x%llx sc 0x%p\n",
2361                       rport->port_id, sc->device->lun, sc);
2362
2363         if (lp->state != LPORT_ST_READY || !(lp->link_up))
2364                 goto fnic_device_reset_end;
2365
2366         /* Check if remote port up */
2367         if (fc_remote_port_chkready(rport)) {
2368                 atomic64_inc(&fnic_stats->misc_stats.rport_not_ready);
2369                 goto fnic_device_reset_end;
2370         }
2371
2372         CMD_FLAGS(sc) = FNIC_DEVICE_RESET;
2373         /* Allocate tag if not present */
2374
2375         tag = sc->request->tag;
2376         if (unlikely(tag < 0)) {
2377                 /*
2378                  * Really should fix the midlayer to pass in a proper
2379                  * request for ioctls...
2380                  */
2381                 tag = fnic_scsi_host_start_tag(fnic, sc);
2382                 if (unlikely(tag == SCSI_NO_TAG))
2383                         goto fnic_device_reset_end;
2384                 tag_gen_flag = 1;
2385                 new_sc = 1;
2386         }
2387         io_lock = fnic_io_lock_hash(fnic, sc);
2388         spin_lock_irqsave(io_lock, flags);
2389         io_req = (struct fnic_io_req *)CMD_SP(sc);
2390
2391         /*
2392          * If there is a io_req attached to this command, then use it,
2393          * else allocate a new one.
2394          */
2395         if (!io_req) {
2396                 io_req = mempool_alloc(fnic->io_req_pool, GFP_ATOMIC);
2397                 if (!io_req) {
2398                         spin_unlock_irqrestore(io_lock, flags);
2399                         goto fnic_device_reset_end;
2400                 }
2401                 memset(io_req, 0, sizeof(*io_req));
2402                 io_req->port_id = rport->port_id;
2403                 CMD_SP(sc) = (char *)io_req;
2404         }
2405         io_req->dr_done = &tm_done;
2406         CMD_STATE(sc) = FNIC_IOREQ_CMD_PENDING;
2407         CMD_LR_STATUS(sc) = FCPIO_INVALID_CODE;
2408         spin_unlock_irqrestore(io_lock, flags);
2409
2410         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host, "TAG %x\n", tag);
2411
2412         /*
2413          * issue the device reset, if enqueue failed, clean up the ioreq
2414          * and break assoc with scsi cmd
2415          */
2416         if (fnic_queue_dr_io_req(fnic, sc, io_req)) {
2417                 spin_lock_irqsave(io_lock, flags);
2418                 io_req = (struct fnic_io_req *)CMD_SP(sc);
2419                 if (io_req)
2420                         io_req->dr_done = NULL;
2421                 goto fnic_device_reset_clean;
2422         }
2423         spin_lock_irqsave(io_lock, flags);
2424         CMD_FLAGS(sc) |= FNIC_DEV_RST_ISSUED;
2425         spin_unlock_irqrestore(io_lock, flags);
2426
2427         /*
2428          * Wait on the local completion for LUN reset.  The io_req may be
2429          * freed while we wait since we hold no lock.
2430          */
2431         wait_for_completion_timeout(&tm_done,
2432                                     msecs_to_jiffies(FNIC_LUN_RESET_TIMEOUT));
2433
2434         spin_lock_irqsave(io_lock, flags);
2435         io_req = (struct fnic_io_req *)CMD_SP(sc);
2436         if (!io_req) {
2437                 spin_unlock_irqrestore(io_lock, flags);
2438                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2439                                 "io_req is null tag 0x%x sc 0x%p\n", tag, sc);
2440                 goto fnic_device_reset_end;
2441         }
2442         io_req->dr_done = NULL;
2443
2444         status = CMD_LR_STATUS(sc);
2445
2446         /*
2447          * If lun reset not completed, bail out with failed. io_req
2448          * gets cleaned up during higher levels of EH
2449          */
2450         if (status == FCPIO_INVALID_CODE) {
2451                 atomic64_inc(&reset_stats->device_reset_timeouts);
2452                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2453                               "Device reset timed out\n");
2454                 CMD_FLAGS(sc) |= FNIC_DEV_RST_TIMED_OUT;
2455                 spin_unlock_irqrestore(io_lock, flags);
2456                 int_to_scsilun(sc->device->lun, &fc_lun);
2457                 /*
2458                  * Issue abort and terminate on device reset request.
2459                  * If q'ing of terminate fails, retry it after a delay.
2460                  */
2461                 while (1) {
2462                         spin_lock_irqsave(io_lock, flags);
2463                         if (CMD_FLAGS(sc) & FNIC_DEV_RST_TERM_ISSUED) {
2464                                 spin_unlock_irqrestore(io_lock, flags);
2465                                 break;
2466                         }
2467                         spin_unlock_irqrestore(io_lock, flags);
2468                         if (fnic_queue_abort_io_req(fnic,
2469                                 tag | FNIC_TAG_DEV_RST,
2470                                 FCPIO_ITMF_ABT_TASK_TERM,
2471                                 fc_lun.scsi_lun, io_req)) {
2472                                 wait_for_completion_timeout(&tm_done,
2473                                 msecs_to_jiffies(FNIC_ABT_TERM_DELAY_TIMEOUT));
2474                         } else {
2475                                 spin_lock_irqsave(io_lock, flags);
2476                                 CMD_FLAGS(sc) |= FNIC_DEV_RST_TERM_ISSUED;
2477                                 CMD_STATE(sc) = FNIC_IOREQ_ABTS_PENDING;
2478                                 io_req->abts_done = &tm_done;
2479                                 spin_unlock_irqrestore(io_lock, flags);
2480                                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2481                                 "Abort and terminate issued on Device reset "
2482                                 "tag 0x%x sc 0x%p\n", tag, sc);
2483                                 break;
2484                         }
2485                 }
2486                 while (1) {
2487                         spin_lock_irqsave(io_lock, flags);
2488                         if (!(CMD_FLAGS(sc) & FNIC_DEV_RST_DONE)) {
2489                                 spin_unlock_irqrestore(io_lock, flags);
2490                                 wait_for_completion_timeout(&tm_done,
2491                                 msecs_to_jiffies(FNIC_LUN_RESET_TIMEOUT));
2492                                 break;
2493                         } else {
2494                                 io_req = (struct fnic_io_req *)CMD_SP(sc);
2495                                 io_req->abts_done = NULL;
2496                                 goto fnic_device_reset_clean;
2497                         }
2498                 }
2499         } else {
2500                 spin_unlock_irqrestore(io_lock, flags);
2501         }
2502
2503         /* Completed, but not successful, clean up the io_req, return fail */
2504         if (status != FCPIO_SUCCESS) {
2505                 spin_lock_irqsave(io_lock, flags);
2506                 FNIC_SCSI_DBG(KERN_DEBUG,
2507                               fnic->lport->host,
2508                               "Device reset completed - failed\n");
2509                 io_req = (struct fnic_io_req *)CMD_SP(sc);
2510                 goto fnic_device_reset_clean;
2511         }
2512
2513         /*
2514          * Clean up any aborts on this lun that have still not
2515          * completed. If any of these fail, then LUN reset fails.
2516          * clean_pending_aborts cleans all cmds on this lun except
2517          * the lun reset cmd. If all cmds get cleaned, the lun reset
2518          * succeeds
2519          */
2520         if (fnic_clean_pending_aborts(fnic, sc, new_sc)) {
2521                 spin_lock_irqsave(io_lock, flags);
2522                 io_req = (struct fnic_io_req *)CMD_SP(sc);
2523                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2524                               "Device reset failed"
2525                               " since could not abort all IOs\n");
2526                 goto fnic_device_reset_clean;
2527         }
2528
2529         /* Clean lun reset command */
2530         spin_lock_irqsave(io_lock, flags);
2531         io_req = (struct fnic_io_req *)CMD_SP(sc);
2532         if (io_req)
2533                 /* Completed, and successful */
2534                 ret = SUCCESS;
2535
2536 fnic_device_reset_clean:
2537         if (io_req)
2538                 CMD_SP(sc) = NULL;
2539
2540         spin_unlock_irqrestore(io_lock, flags);
2541
2542         if (io_req) {
2543                 start_time = io_req->start_time;
2544                 fnic_release_ioreq_buf(fnic, io_req, sc);
2545                 mempool_free(io_req, fnic->io_req_pool);
2546         }
2547
2548 fnic_device_reset_end:
2549         FNIC_TRACE(fnic_device_reset, sc->device->host->host_no,
2550                   sc->request->tag, sc,
2551                   jiffies_to_msecs(jiffies - start_time),
2552                   0, ((u64)sc->cmnd[0] << 32 |
2553                   (u64)sc->cmnd[2] << 24 | (u64)sc->cmnd[3] << 16 |
2554                   (u64)sc->cmnd[4] << 8 | sc->cmnd[5]),
2555                   (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc)));
2556
2557         /* free tag if it is allocated */
2558         if (unlikely(tag_gen_flag))
2559                 fnic_scsi_host_end_tag(fnic, sc);
2560
2561         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2562                       "Returning from device reset %s\n",
2563                       (ret == SUCCESS) ?
2564                       "SUCCESS" : "FAILED");
2565
2566         if (ret == FAILED)
2567                 atomic64_inc(&reset_stats->device_reset_failures);
2568
2569         return ret;
2570 }
2571
2572 /* Clean up all IOs, clean up libFC local port */
2573 int fnic_reset(struct Scsi_Host *shost)
2574 {
2575         struct fc_lport *lp;
2576         struct fnic *fnic;
2577         int ret = 0;
2578         struct reset_stats *reset_stats;
2579
2580         lp = shost_priv(shost);
2581         fnic = lport_priv(lp);
2582         reset_stats = &fnic->fnic_stats.reset_stats;
2583
2584         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2585                       "fnic_reset called\n");
2586
2587         atomic64_inc(&reset_stats->fnic_resets);
2588
2589         /*
2590          * Reset local port, this will clean up libFC exchanges,
2591          * reset remote port sessions, and if link is up, begin flogi
2592          */
2593         ret = fc_lport_reset(lp);
2594
2595         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2596                       "Returning from fnic reset %s\n",
2597                       (ret == 0) ?
2598                       "SUCCESS" : "FAILED");
2599
2600         if (ret == 0)
2601                 atomic64_inc(&reset_stats->fnic_reset_completions);
2602         else
2603                 atomic64_inc(&reset_stats->fnic_reset_failures);
2604
2605         return ret;
2606 }
2607
2608 /*
2609  * SCSI Error handling calls driver's eh_host_reset if all prior
2610  * error handling levels return FAILED. If host reset completes
2611  * successfully, and if link is up, then Fabric login begins.
2612  *
2613  * Host Reset is the highest level of error recovery. If this fails, then
2614  * host is offlined by SCSI.
2615  *
2616  */
2617 int fnic_host_reset(struct scsi_cmnd *sc)
2618 {
2619         int ret;
2620         unsigned long wait_host_tmo;
2621         struct Scsi_Host *shost = sc->device->host;
2622         struct fc_lport *lp = shost_priv(shost);
2623         struct fnic *fnic = lport_priv(lp);
2624         unsigned long flags;
2625
2626         spin_lock_irqsave(&fnic->fnic_lock, flags);
2627         if (fnic->internal_reset_inprogress == 0) {
2628                 fnic->internal_reset_inprogress = 1;
2629         } else {
2630                 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2631                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2632                         "host reset in progress skipping another host reset\n");
2633                 return SUCCESS;
2634         }
2635         spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2636
2637         /*
2638          * If fnic_reset is successful, wait for fabric login to complete
2639          * scsi-ml tries to send a TUR to every device if host reset is
2640          * successful, so before returning to scsi, fabric should be up
2641          */
2642         ret = (fnic_reset(shost) == 0) ? SUCCESS : FAILED;
2643         if (ret == SUCCESS) {
2644                 wait_host_tmo = jiffies + FNIC_HOST_RESET_SETTLE_TIME * HZ;
2645                 ret = FAILED;
2646                 while (time_before(jiffies, wait_host_tmo)) {
2647                         if ((lp->state == LPORT_ST_READY) &&
2648                             (lp->link_up)) {
2649                                 ret = SUCCESS;
2650                                 break;
2651                         }
2652                         ssleep(1);
2653                 }
2654         }
2655
2656         spin_lock_irqsave(&fnic->fnic_lock, flags);
2657         fnic->internal_reset_inprogress = 0;
2658         spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2659         return ret;
2660 }
2661
2662 /*
2663  * This fxn is called from libFC when host is removed
2664  */
2665 void fnic_scsi_abort_io(struct fc_lport *lp)
2666 {
2667         int err = 0;
2668         unsigned long flags;
2669         enum fnic_state old_state;
2670         struct fnic *fnic = lport_priv(lp);
2671         DECLARE_COMPLETION_ONSTACK(remove_wait);
2672
2673         /* Issue firmware reset for fnic, wait for reset to complete */
2674 retry_fw_reset:
2675         spin_lock_irqsave(&fnic->fnic_lock, flags);
2676         if (unlikely(fnic->state == FNIC_IN_FC_TRANS_ETH_MODE)) {
2677                 /* fw reset is in progress, poll for its completion */
2678                 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2679                 schedule_timeout(msecs_to_jiffies(100));
2680                 goto retry_fw_reset;
2681         }
2682
2683         fnic->remove_wait = &remove_wait;
2684         old_state = fnic->state;
2685         fnic->state = FNIC_IN_FC_TRANS_ETH_MODE;
2686         fnic_update_mac_locked(fnic, fnic->ctlr.ctl_src_addr);
2687         spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2688
2689         err = fnic_fw_reset_handler(fnic);
2690         if (err) {
2691                 spin_lock_irqsave(&fnic->fnic_lock, flags);
2692                 if (fnic->state == FNIC_IN_FC_TRANS_ETH_MODE)
2693                         fnic->state = old_state;
2694                 fnic->remove_wait = NULL;
2695                 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2696                 return;
2697         }
2698
2699         /* Wait for firmware reset to complete */
2700         wait_for_completion_timeout(&remove_wait,
2701                                     msecs_to_jiffies(FNIC_RMDEVICE_TIMEOUT));
2702
2703         spin_lock_irqsave(&fnic->fnic_lock, flags);
2704         fnic->remove_wait = NULL;
2705         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2706                       "fnic_scsi_abort_io %s\n",
2707                       (fnic->state == FNIC_IN_ETH_MODE) ?
2708                       "SUCCESS" : "FAILED");
2709         spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2710
2711 }
2712
2713 /*
2714  * This fxn called from libFC to clean up driver IO state on link down
2715  */
2716 void fnic_scsi_cleanup(struct fc_lport *lp)
2717 {
2718         unsigned long flags;
2719         enum fnic_state old_state;
2720         struct fnic *fnic = lport_priv(lp);
2721
2722         /* issue fw reset */
2723 retry_fw_reset:
2724         spin_lock_irqsave(&fnic->fnic_lock, flags);
2725         if (unlikely(fnic->state == FNIC_IN_FC_TRANS_ETH_MODE)) {
2726                 /* fw reset is in progress, poll for its completion */
2727                 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2728                 schedule_timeout(msecs_to_jiffies(100));
2729                 goto retry_fw_reset;
2730         }
2731         old_state = fnic->state;
2732         fnic->state = FNIC_IN_FC_TRANS_ETH_MODE;
2733         fnic_update_mac_locked(fnic, fnic->ctlr.ctl_src_addr);
2734         spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2735
2736         if (fnic_fw_reset_handler(fnic)) {
2737                 spin_lock_irqsave(&fnic->fnic_lock, flags);
2738                 if (fnic->state == FNIC_IN_FC_TRANS_ETH_MODE)
2739                         fnic->state = old_state;
2740                 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2741         }
2742
2743 }
2744
2745 void fnic_empty_scsi_cleanup(struct fc_lport *lp)
2746 {
2747 }
2748
2749 void fnic_exch_mgr_reset(struct fc_lport *lp, u32 sid, u32 did)
2750 {
2751         struct fnic *fnic = lport_priv(lp);
2752
2753         /* Non-zero sid, nothing to do */
2754         if (sid)
2755                 goto call_fc_exch_mgr_reset;
2756
2757         if (did) {
2758                 fnic_rport_exch_reset(fnic, did);
2759                 goto call_fc_exch_mgr_reset;
2760         }
2761
2762         /*
2763          * sid = 0, did = 0
2764          * link down or device being removed
2765          */
2766         if (!fnic->in_remove)
2767                 fnic_scsi_cleanup(lp);
2768         else
2769                 fnic_scsi_abort_io(lp);
2770
2771         /* call libFC exch mgr reset to reset its exchanges */
2772 call_fc_exch_mgr_reset:
2773         fc_exch_mgr_reset(lp, sid, did);
2774
2775 }
2776
2777 /*
2778  * fnic_is_abts_pending() is a helper function that
2779  * walks through tag map to check if there is any IOs pending,if there is one,
2780  * then it returns 1 (true), otherwise 0 (false)
2781  * if @lr_sc is non NULL, then it checks IOs specific to particular LUN,
2782  * otherwise, it checks for all IOs.
2783  */
2784 int fnic_is_abts_pending(struct fnic *fnic, struct scsi_cmnd *lr_sc)
2785 {
2786         int tag;
2787         struct fnic_io_req *io_req;
2788         spinlock_t *io_lock;
2789         unsigned long flags;
2790         int ret = 0;
2791         struct scsi_cmnd *sc;
2792         struct scsi_device *lun_dev = NULL;
2793
2794         if (lr_sc)
2795                 lun_dev = lr_sc->device;
2796
2797         /* walk again to check, if IOs are still pending in fw */
2798         for (tag = 0; tag < fnic->fnic_max_tag_id; tag++) {
2799                 sc = scsi_host_find_tag(fnic->lport->host, tag);
2800                 /*
2801                  * ignore this lun reset cmd or cmds that do not belong to
2802                  * this lun
2803                  */
2804                 if (!sc || (lr_sc && (sc->device != lun_dev || sc == lr_sc)))
2805                         continue;
2806
2807                 io_lock = fnic_io_lock_hash(fnic, sc);
2808                 spin_lock_irqsave(io_lock, flags);
2809
2810                 io_req = (struct fnic_io_req *)CMD_SP(sc);
2811
2812                 if (!io_req || sc->device != lun_dev) {
2813                         spin_unlock_irqrestore(io_lock, flags);
2814                         continue;
2815                 }
2816
2817                 /*
2818                  * Found IO that is still pending with firmware and
2819                  * belongs to the LUN that we are resetting
2820                  */
2821                 FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host,
2822                               "Found IO in %s on lun\n",
2823                               fnic_ioreq_state_to_str(CMD_STATE(sc)));
2824
2825                 if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING)
2826                         ret = 1;
2827                 spin_unlock_irqrestore(io_lock, flags);
2828         }
2829
2830         return ret;
2831 }