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