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, int exclude_id);
 106
 107 static inline spinlock_t *fnic_io_lock_hash(struct fnic *fnic,
 108                                             struct scsi_cmnd *sc)
 109 {
 110         u32 hash = sc->request->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, sc->request->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, void (*done)(struct scsi_cmnd *))
 424 {
 425         struct fc_lport *lp = shost_priv(sc->device->host);
 426         struct fc_rport *rport;
 427         struct fnic_io_req *io_req = NULL;
 428         struct fnic *fnic = lport_priv(lp);
 429         struct fnic_stats *fnic_stats = &fnic->fnic_stats;
 430         struct vnic_wq_copy *wq;
 431         int ret;
 432         u64 cmd_trace;
 433         int sg_count = 0;
 434         unsigned long flags = 0;
 435         unsigned long ptr;
 436         spinlock_t *io_lock = NULL;
 437         int io_lock_acquired = 0;
 438         struct fc_rport_libfc_priv *rp;
 439
 440         if (unlikely(fnic_chk_state_flags_locked(fnic, FNIC_FLAGS_IO_BLOCKED)))
 441                 return SCSI_MLQUEUE_HOST_BUSY;
 442
 443         if (unlikely(fnic_chk_state_flags_locked(fnic, FNIC_FLAGS_FWRESET)))
 444                 return SCSI_MLQUEUE_HOST_BUSY;
 445
 446         rport = starget_to_rport(scsi_target(sc->device));
 447         if (!rport) {
 448                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
 449                                 "returning DID_NO_CONNECT for IO as rport is NULL\n");
 450                 sc->result = DID_NO_CONNECT << 16;
 451                 done(sc);
 452                 return 0;
 453         }
 454
 455         ret = fc_remote_port_chkready(rport);
 456         if (ret) {
 457                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
 458                                 "rport is not ready\n");
 459                 atomic64_inc(&fnic_stats->misc_stats.rport_not_ready);
 460                 sc->result = ret;
 461                 done(sc);
 462                 return 0;
 463         }
 464
 465         rp = rport->dd_data;
 466         if (!rp || rp->rp_state == RPORT_ST_DELETE) {
 467                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
 468                         "rport 0x%x removed, returning DID_NO_CONNECT\n",
 469                         rport->port_id);
 470
 471                 atomic64_inc(&fnic_stats->misc_stats.rport_not_ready);
 472                 sc->result = DID_NO_CONNECT<<16;
 473                 done(sc);
 474                 return 0;
 475         }
 476
 477         if (rp->rp_state != RPORT_ST_READY) {
 478                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
 479                         "rport 0x%x in state 0x%x, returning DID_IMM_RETRY\n",
 480                         rport->port_id, rp->rp_state);
 481
 482                 sc->result = DID_IMM_RETRY << 16;
 483                 done(sc);
 484                 return 0;
 485         }
 486
 487         if (lp->state != LPORT_ST_READY || !(lp->link_up))
 488                 return SCSI_MLQUEUE_HOST_BUSY;
 489
 490         atomic_inc(&fnic->in_flight);
 491
 492         /*
 493          * Release host lock, use driver resource specific locks from here.
 494          * Don't re-enable interrupts in case they were disabled prior to the
 495          * caller disabling them.
 496          */
 497         spin_unlock(lp->host->host_lock);
 498         CMD_STATE(sc) = FNIC_IOREQ_NOT_INITED;
 499         CMD_FLAGS(sc) = FNIC_NO_FLAGS;
 500
 501         /* Get a new io_req for this SCSI IO */
 502         io_req = mempool_alloc(fnic->io_req_pool, GFP_ATOMIC);
 503         if (!io_req) {
 504                 atomic64_inc(&fnic_stats->io_stats.alloc_failures);
 505                 ret = SCSI_MLQUEUE_HOST_BUSY;
 506                 goto out;
 507         }
 508         memset(io_req, 0, sizeof(*io_req));
 509
 510         /* Map the data buffer */
 511         sg_count = scsi_dma_map(sc);
 512         if (sg_count < 0) {
 513                 FNIC_TRACE(fnic_queuecommand, sc->device->host->host_no,
 514                           sc->request->tag, sc, 0, sc->cmnd[0],
 515                           sg_count, CMD_STATE(sc));
 516                 mempool_free(io_req, fnic->io_req_pool);
 517                 goto out;
 518         }
 519
 520         /* Determine the type of scatter/gather list we need */
 521         io_req->sgl_cnt = sg_count;
 522         io_req->sgl_type = FNIC_SGL_CACHE_DFLT;
 523         if (sg_count > FNIC_DFLT_SG_DESC_CNT)
 524                 io_req->sgl_type = FNIC_SGL_CACHE_MAX;
 525
 526         if (sg_count) {
 527                 io_req->sgl_list =
 528                         mempool_alloc(fnic->io_sgl_pool[io_req->sgl_type],
 529                                       GFP_ATOMIC);
 530                 if (!io_req->sgl_list) {
 531                         atomic64_inc(&fnic_stats->io_stats.alloc_failures);
 532                         ret = SCSI_MLQUEUE_HOST_BUSY;
 533                         scsi_dma_unmap(sc);
 534                         mempool_free(io_req, fnic->io_req_pool);
 535                         goto out;
 536                 }
 537
 538                 /* Cache sgl list allocated address before alignment */
 539                 io_req->sgl_list_alloc = io_req->sgl_list;
 540                 ptr = (unsigned long) io_req->sgl_list;
 541                 if (ptr % FNIC_SG_DESC_ALIGN) {
 542                         io_req->sgl_list = (struct host_sg_desc *)
 543                                 (((unsigned long) ptr
 544                                   + FNIC_SG_DESC_ALIGN - 1)
 545                                  & ~(FNIC_SG_DESC_ALIGN - 1));
 546                 }
 547         }
 548
 549         /*
 550         * Will acquire lock defore setting to IO initialized.
 551         */
 552
 553         io_lock = fnic_io_lock_hash(fnic, sc);
 554         spin_lock_irqsave(io_lock, flags);
 555
 556         /* initialize rest of io_req */
 557         io_lock_acquired = 1;
 558         io_req->port_id = rport->port_id;
 559         io_req->start_time = jiffies;
 560         CMD_STATE(sc) = FNIC_IOREQ_CMD_PENDING;
 561         CMD_SP(sc) = (char *)io_req;
 562         CMD_FLAGS(sc) |= FNIC_IO_INITIALIZED;
 563         sc->scsi_done = done;
 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                           sc->request->tag, sc, 0, 0, 0,
 575                           (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc)));
 576                 io_req = (struct fnic_io_req *)CMD_SP(sc);
 577                 CMD_SP(sc) = NULL;
 578                 CMD_STATE(sc) = FNIC_IOREQ_CMD_COMPLETE;
 579                 spin_unlock_irqrestore(io_lock, flags);
 580                 if (io_req) {
 581                         fnic_release_ioreq_buf(fnic, io_req, sc);
 582                         mempool_free(io_req, fnic->io_req_pool);
 583                 }
 584                 atomic_dec(&fnic->in_flight);
 585                 /* acquire host lock before returning to SCSI */
 586                 spin_lock(lp->host->host_lock);
 587                 return ret;
 588         } else {
 589                 atomic64_inc(&fnic_stats->io_stats.active_ios);
 590                 atomic64_inc(&fnic_stats->io_stats.num_ios);
 591                 if (atomic64_read(&fnic_stats->io_stats.active_ios) >
 592                           atomic64_read(&fnic_stats->io_stats.max_active_ios))
 593                         atomic64_set(&fnic_stats->io_stats.max_active_ios,
 594                              atomic64_read(&fnic_stats->io_stats.active_ios));
 595
 596                 /* REVISIT: Use per IO lock in the final code */
 597                 CMD_FLAGS(sc) |= FNIC_IO_ISSUED;
 598         }
 599 out:
 600         cmd_trace = ((u64)sc->cmnd[0] << 56 | (u64)sc->cmnd[7] << 40 |
 601                         (u64)sc->cmnd[8] << 32 | (u64)sc->cmnd[2] << 24 |
 602                         (u64)sc->cmnd[3] << 16 | (u64)sc->cmnd[4] << 8 |
 603                         sc->cmnd[5]);
 604
 605         FNIC_TRACE(fnic_queuecommand, sc->device->host->host_no,
 606                   sc->request->tag, sc, io_req,
 607                   sg_count, cmd_trace,
 608                   (((u64)CMD_FLAGS(sc) >> 32) | CMD_STATE(sc)));
 609
 610         /* if only we issued IO, will we have the io lock */
 611         if (io_lock_acquired)
 612                 spin_unlock_irqrestore(io_lock, flags);
 613
 614         atomic_dec(&fnic->in_flight);
 615         /* acquire host lock before returning to SCSI */
 616         spin_lock(lp->host->host_lock);
 617         return ret;
 618 }
 619
 620 DEF_SCSI_QCMD(fnic_queuecommand)
 621
 622 /*
 623  * fnic_fcpio_fw_reset_cmpl_handler
 624  * Routine to handle fw reset completion
 625  */
 626 static int fnic_fcpio_fw_reset_cmpl_handler(struct fnic *fnic,
 627                                             struct fcpio_fw_req *desc)
 628 {
 629         u8 type;
 630         u8 hdr_status;
 631         struct fcpio_tag tag;
 632         int ret = 0;
 633         unsigned long flags;
 634         struct reset_stats *reset_stats = &fnic->fnic_stats.reset_stats;
 635
 636         fcpio_header_dec(&desc->hdr, &type, &hdr_status, &tag);
 637
 638         atomic64_inc(&reset_stats->fw_reset_completions);
 639
 640         /* Clean up all outstanding io requests */
 641         fnic_cleanup_io(fnic, SCSI_NO_TAG);
 642
 643         atomic64_set(&fnic->fnic_stats.fw_stats.active_fw_reqs, 0);
 644         atomic64_set(&fnic->fnic_stats.io_stats.active_ios, 0);
 645         atomic64_set(&fnic->io_cmpl_skip, 0);
 646
 647         spin_lock_irqsave(&fnic->fnic_lock, flags);
 648
 649         /* fnic should be in FC_TRANS_ETH_MODE */
 650         if (fnic->state == FNIC_IN_FC_TRANS_ETH_MODE) {
 651                 /* Check status of reset completion */
 652                 if (!hdr_status) {
 653                         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
 654                                       "reset cmpl success\n");
 655                         /* Ready to send flogi out */
 656                         fnic->state = FNIC_IN_ETH_MODE;
 657                 } else {
 658                         FNIC_SCSI_DBG(KERN_DEBUG,
 659                                       fnic->lport->host,
 660                                       "fnic fw_reset : failed %s\n",
 661                                       fnic_fcpio_status_to_str(hdr_status));
 662
 663                         /*
 664                          * Unable to change to eth mode, cannot send out flogi
 665                          * Change state to fc mode, so that subsequent Flogi
 666                          * requests from libFC will cause more attempts to
 667                          * reset the firmware. Free the cached flogi
 668                          */
 669                         fnic->state = FNIC_IN_FC_MODE;
 670                         atomic64_inc(&reset_stats->fw_reset_failures);
 671                         ret = -1;
 672                 }
 673         } else {
 674                 FNIC_SCSI_DBG(KERN_DEBUG,
 675                               fnic->lport->host,
 676                               "Unexpected state %s while processing"
 677                               " reset cmpl\n", fnic_state_to_str(fnic->state));
 678                 atomic64_inc(&reset_stats->fw_reset_failures);
 679                 ret = -1;
 680         }
 681
 682         /* Thread removing device blocks till firmware reset is complete */
 683         if (fnic->remove_wait)
 684                 complete(fnic->remove_wait);
 685
 686         /*
 687          * If fnic is being removed, or fw reset failed
 688          * free the flogi frame. Else, send it out
 689          */
 690         if (fnic->remove_wait || ret) {
 691                 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
 692                 skb_queue_purge(&fnic->tx_queue);
 693                 goto reset_cmpl_handler_end;
 694         }
 695
 696         spin_unlock_irqrestore(&fnic->fnic_lock, flags);
 697
 698         fnic_flush_tx(fnic);
 699
 700  reset_cmpl_handler_end:
 701         fnic_clear_state_flags(fnic, FNIC_FLAGS_FWRESET);
 702
 703         return ret;
 704 }
 705
 706 /*
 707  * fnic_fcpio_flogi_reg_cmpl_handler
 708  * Routine to handle flogi register completion
 709  */
 710 static int fnic_fcpio_flogi_reg_cmpl_handler(struct fnic *fnic,
 711                                              struct fcpio_fw_req *desc)
 712 {
 713         u8 type;
 714         u8 hdr_status;
 715         struct fcpio_tag tag;
 716         int ret = 0;
 717         unsigned long flags;
 718
 719         fcpio_header_dec(&desc->hdr, &type, &hdr_status, &tag);
 720
 721         /* Update fnic state based on status of flogi reg completion */
 722         spin_lock_irqsave(&fnic->fnic_lock, flags);
 723
 724         if (fnic->state == FNIC_IN_ETH_TRANS_FC_MODE) {
 725
 726                 /* Check flogi registration completion status */
 727                 if (!hdr_status) {
 728                         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
 729                                       "flog reg succeeded\n");
 730                         fnic->state = FNIC_IN_FC_MODE;
 731                 } else {
 732                         FNIC_SCSI_DBG(KERN_DEBUG,
 733                                       fnic->lport->host,
 734                                       "fnic flogi reg :failed %s\n",
 735                                       fnic_fcpio_status_to_str(hdr_status));
 736                         fnic->state = FNIC_IN_ETH_MODE;
 737                         ret = -1;
 738                 }
 739         } else {
 740                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
 741                               "Unexpected fnic state %s while"
 742                               " processing flogi reg completion\n",
 743                               fnic_state_to_str(fnic->state));
 744                 ret = -1;
 745         }
 746
 747         if (!ret) {
 748                 if (fnic->stop_rx_link_events) {
 749                         spin_unlock_irqrestore(&fnic->fnic_lock, flags);
 750                         goto reg_cmpl_handler_end;
 751                 }
 752                 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
 753
 754                 fnic_flush_tx(fnic);
 755                 queue_work(fnic_event_queue, &fnic->frame_work);
 756         } else {
 757                 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
 758         }
 759
 760 reg_cmpl_handler_end:
 761         return ret;
 762 }
 763
 764 static inline int is_ack_index_in_range(struct vnic_wq_copy *wq,
 765                                         u16 request_out)
 766 {
 767         if (wq->to_clean_index <= wq->to_use_index) {
 768                 /* out of range, stale request_out index */
 769                 if (request_out < wq->to_clean_index ||
 770                     request_out >= wq->to_use_index)
 771                         return 0;
 772         } else {
 773                 /* out of range, stale request_out index */
 774                 if (request_out < wq->to_clean_index &&
 775                     request_out >= wq->to_use_index)
 776                         return 0;
 777         }
 778         /* request_out index is in range */
 779         return 1;
 780 }
 781
 782
 783 /*
 784  * Mark that ack received and store the Ack index. If there are multiple
 785  * acks received before Tx thread cleans it up, the latest value will be
 786  * used which is correct behavior. This state should be in the copy Wq
 787  * instead of in the fnic
 788  */
 789 static inline void fnic_fcpio_ack_handler(struct fnic *fnic,
 790                                           unsigned int cq_index,
 791                                           struct fcpio_fw_req *desc)
 792 {
 793         struct vnic_wq_copy *wq;
 794         u16 request_out = desc->u.ack.request_out;
 795         unsigned long flags;
 796         u64 *ox_id_tag = (u64 *)(void *)desc;
 797
 798         /* mark the ack state */
 799         wq = &fnic->wq_copy[cq_index - fnic->raw_wq_count - fnic->rq_count];
 800         spin_lock_irqsave(&fnic->wq_copy_lock[0], flags);
 801
 802         fnic->fnic_stats.misc_stats.last_ack_time = jiffies;
 803         if (is_ack_index_in_range(wq, request_out)) {
 804                 fnic->fw_ack_index[0] = request_out;
 805                 fnic->fw_ack_recd[0] = 1;
 806         } else
 807                 atomic64_inc(
 808                         &fnic->fnic_stats.misc_stats.ack_index_out_of_range);
 809
 810         spin_unlock_irqrestore(&fnic->wq_copy_lock[0], flags);
 811         FNIC_TRACE(fnic_fcpio_ack_handler,
 812                   fnic->lport->host->host_no, 0, 0, ox_id_tag[2], ox_id_tag[3],
 813                   ox_id_tag[4], ox_id_tag[5]);
 814 }
 815
 816 /*
 817  * fnic_fcpio_icmnd_cmpl_handler
 818  * Routine to handle icmnd completions
 819  */
 820 static void fnic_fcpio_icmnd_cmpl_handler(struct fnic *fnic,
 821                                          struct fcpio_fw_req *desc)
 822 {
 823         u8 type;
 824         u8 hdr_status;
 825         struct fcpio_tag tag;
 826         u32 id;
 827         u64 xfer_len = 0;
 828         struct fcpio_icmnd_cmpl *icmnd_cmpl;
 829         struct fnic_io_req *io_req;
 830         struct scsi_cmnd *sc;
 831         struct fnic_stats *fnic_stats = &fnic->fnic_stats;
 832         unsigned long flags;
 833         spinlock_t *io_lock;
 834         u64 cmd_trace;
 835         unsigned long start_time;
 836         unsigned long io_duration_time;
 837
 838         /* Decode the cmpl description to get the io_req id */
 839         fcpio_header_dec(&desc->hdr, &type, &hdr_status, &tag);
 840         fcpio_tag_id_dec(&tag, &id);
 841         icmnd_cmpl = &desc->u.icmnd_cmpl;
 842
 843         if (id >= fnic->fnic_max_tag_id) {
 844                 shost_printk(KERN_ERR, fnic->lport->host,
 845                         "Tag out of range tag %x hdr status = %s\n",
 846                              id, fnic_fcpio_status_to_str(hdr_status));
 847                 return;
 848         }
 849
 850         sc = scsi_host_find_tag(fnic->lport->host, id);
 851         WARN_ON_ONCE(!sc);
 852         if (!sc) {
 853                 atomic64_inc(&fnic_stats->io_stats.sc_null);
 854                 shost_printk(KERN_ERR, fnic->lport->host,
 855                           "icmnd_cmpl sc is null - "
 856                           "hdr status = %s tag = 0x%x desc = 0x%p\n",
 857                           fnic_fcpio_status_to_str(hdr_status), id, desc);
 858                 FNIC_TRACE(fnic_fcpio_icmnd_cmpl_handler,
 859                           fnic->lport->host->host_no, id,
 860                           ((u64)icmnd_cmpl->_resvd0[1] << 16 |
 861                           (u64)icmnd_cmpl->_resvd0[0]),
 862                           ((u64)hdr_status << 16 |
 863                           (u64)icmnd_cmpl->scsi_status << 8 |
 864                           (u64)icmnd_cmpl->flags), desc,
 865                           (u64)icmnd_cmpl->residual, 0);
 866                 return;
 867         }
 868
 869         io_lock = fnic_io_lock_hash(fnic, sc);
 870         spin_lock_irqsave(io_lock, flags);
 871         io_req = (struct fnic_io_req *)CMD_SP(sc);
 872         WARN_ON_ONCE(!io_req);
 873         if (!io_req) {
 874                 atomic64_inc(&fnic_stats->io_stats.ioreq_null);
 875                 CMD_FLAGS(sc) |= FNIC_IO_REQ_NULL;
 876                 spin_unlock_irqrestore(io_lock, flags);
 877                 shost_printk(KERN_ERR, fnic->lport->host,
 878                           "icmnd_cmpl io_req is null - "
 879                           "hdr status = %s tag = 0x%x sc 0x%p\n",
 880                           fnic_fcpio_status_to_str(hdr_status), id, sc);
 881                 return;
 882         }
 883         start_time = io_req->start_time;
 884
 885         /* firmware completed the io */
 886         io_req->io_completed = 1;
 887
 888         /*
 889          *  if SCSI-ML has already issued abort on this command,
 890          *  set completion of the IO. The abts path will clean it up
 891          */
 892         if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING) {
 893
 894                 /*
 895                  * set the FNIC_IO_DONE so that this doesn't get
 896                  * flagged as 'out of order' if it was not aborted
 897                  */
 898                 CMD_FLAGS(sc) |= FNIC_IO_DONE;
 899                 CMD_FLAGS(sc) |= FNIC_IO_ABTS_PENDING;
 900                 spin_unlock_irqrestore(io_lock, flags);
 901                 if(FCPIO_ABORTED == hdr_status)
 902                         CMD_FLAGS(sc) |= FNIC_IO_ABORTED;
 903
 904                 FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host,
 905                         "icmnd_cmpl abts pending "
 906                           "hdr status = %s tag = 0x%x sc = 0x%p "
 907                           "scsi_status = %x residual = %d\n",
 908                           fnic_fcpio_status_to_str(hdr_status),
 909                           id, sc,
 910                           icmnd_cmpl->scsi_status,
 911                           icmnd_cmpl->residual);
 912                 return;
 913         }
 914
 915         /* Mark the IO as complete */
 916         CMD_STATE(sc) = FNIC_IOREQ_CMD_COMPLETE;
 917
 918         icmnd_cmpl = &desc->u.icmnd_cmpl;
 919
 920         switch (hdr_status) {
 921         case FCPIO_SUCCESS:
 922                 sc->result = (DID_OK << 16) | icmnd_cmpl->scsi_status;
 923                 xfer_len = scsi_bufflen(sc);
 924                 scsi_set_resid(sc, icmnd_cmpl->residual);
 925
 926                 if (icmnd_cmpl->flags & FCPIO_ICMND_CMPL_RESID_UNDER)
 927                         xfer_len -= icmnd_cmpl->residual;
 928
 929                 if (icmnd_cmpl->scsi_status == SAM_STAT_CHECK_CONDITION)
 930                         atomic64_inc(&fnic_stats->misc_stats.check_condition);
 931
 932                 if (icmnd_cmpl->scsi_status == SAM_STAT_TASK_SET_FULL)
 933                         atomic64_inc(&fnic_stats->misc_stats.queue_fulls);
 934                 break;
 935
 936         case FCPIO_TIMEOUT:          /* request was timed out */
 937                 atomic64_inc(&fnic_stats->misc_stats.fcpio_timeout);
 938                 sc->result = (DID_TIME_OUT << 16) | icmnd_cmpl->scsi_status;
 939                 break;
 940
 941         case FCPIO_ABORTED:          /* request was aborted */
 942                 atomic64_inc(&fnic_stats->misc_stats.fcpio_aborted);
 943                 sc->result = (DID_ERROR << 16) | icmnd_cmpl->scsi_status;
 944                 break;
 945
 946         case FCPIO_DATA_CNT_MISMATCH: /* recv/sent more/less data than exp. */
 947                 atomic64_inc(&fnic_stats->misc_stats.data_count_mismatch);
 948                 scsi_set_resid(sc, icmnd_cmpl->residual);
 949                 sc->result = (DID_ERROR << 16) | icmnd_cmpl->scsi_status;
 950                 break;
 951
 952         case FCPIO_OUT_OF_RESOURCE:  /* out of resources to complete request */
 953                 atomic64_inc(&fnic_stats->fw_stats.fw_out_of_resources);
 954                 sc->result = (DID_REQUEUE << 16) | icmnd_cmpl->scsi_status;
 955                 break;
 956
 957         case FCPIO_IO_NOT_FOUND:     /* requested I/O was not found */
 958                 atomic64_inc(&fnic_stats->io_stats.io_not_found);
 959                 sc->result = (DID_ERROR << 16) | icmnd_cmpl->scsi_status;
 960                 break;
 961
 962         case FCPIO_SGL_INVALID:      /* request was aborted due to sgl error */
 963                 atomic64_inc(&fnic_stats->misc_stats.sgl_invalid);
 964                 sc->result = (DID_ERROR << 16) | icmnd_cmpl->scsi_status;
 965                 break;
 966
 967         case FCPIO_FW_ERR:           /* request was terminated due fw error */
 968                 atomic64_inc(&fnic_stats->fw_stats.io_fw_errs);
 969                 sc->result = (DID_ERROR << 16) | icmnd_cmpl->scsi_status;
 970                 break;
 971
 972         case FCPIO_MSS_INVALID:      /* request was aborted due to mss error */
 973                 atomic64_inc(&fnic_stats->misc_stats.mss_invalid);
 974                 sc->result = (DID_ERROR << 16) | icmnd_cmpl->scsi_status;
 975                 break;
 976
 977         case FCPIO_INVALID_HEADER:   /* header contains invalid data */
 978         case FCPIO_INVALID_PARAM:    /* some parameter in request invalid */
 979         case FCPIO_REQ_NOT_SUPPORTED:/* request type is not supported */
 980         default:
 981                 sc->result = (DID_ERROR << 16) | icmnd_cmpl->scsi_status;
 982                 break;
 983         }
 984
 985         /* Break link with the SCSI command */
 986         CMD_SP(sc) = NULL;
 987         CMD_FLAGS(sc) |= FNIC_IO_DONE;
 988
 989         spin_unlock_irqrestore(io_lock, flags);
 990
 991         if (hdr_status != FCPIO_SUCCESS) {
 992                 atomic64_inc(&fnic_stats->io_stats.io_failures);
 993                 shost_printk(KERN_ERR, fnic->lport->host, "hdr status = %s\n",
 994                              fnic_fcpio_status_to_str(hdr_status));
 995         }
 996
 997         fnic_release_ioreq_buf(fnic, io_req, sc);
 998
 999         mempool_free(io_req, fnic->io_req_pool);
1000
1001         cmd_trace = ((u64)hdr_status << 56) |
1002                   (u64)icmnd_cmpl->scsi_status << 48 |
1003                   (u64)icmnd_cmpl->flags << 40 | (u64)sc->cmnd[0] << 32 |
1004                   (u64)sc->cmnd[2] << 24 | (u64)sc->cmnd[3] << 16 |
1005                   (u64)sc->cmnd[4] << 8 | sc->cmnd[5];
1006
1007         FNIC_TRACE(fnic_fcpio_icmnd_cmpl_handler,
1008                   sc->device->host->host_no, id, sc,
1009                   ((u64)icmnd_cmpl->_resvd0[1] << 56 |
1010                   (u64)icmnd_cmpl->_resvd0[0] << 48 |
1011                   jiffies_to_msecs(jiffies - start_time)),
1012                   desc, cmd_trace,
1013                   (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc)));
1014
1015         if (sc->sc_data_direction == DMA_FROM_DEVICE) {
1016                 fnic->lport->host_stats.fcp_input_requests++;
1017                 fnic->fcp_input_bytes += xfer_len;
1018         } else if (sc->sc_data_direction == DMA_TO_DEVICE) {
1019                 fnic->lport->host_stats.fcp_output_requests++;
1020                 fnic->fcp_output_bytes += xfer_len;
1021         } else
1022                 fnic->lport->host_stats.fcp_control_requests++;
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         /* Call SCSI completion function to complete the IO */
1054         if (sc->scsi_done)
1055                 sc->scsi_done(sc);
1056 }
1057
1058 /* fnic_fcpio_itmf_cmpl_handler
1059  * Routine to handle itmf completions
1060  */
1061 static void fnic_fcpio_itmf_cmpl_handler(struct fnic *fnic,
1062                                         struct fcpio_fw_req *desc)
1063 {
1064         u8 type;
1065         u8 hdr_status;
1066         struct fcpio_tag tag;
1067         u32 id;
1068         struct scsi_cmnd *sc;
1069         struct fnic_io_req *io_req;
1070         struct fnic_stats *fnic_stats = &fnic->fnic_stats;
1071         struct abort_stats *abts_stats = &fnic->fnic_stats.abts_stats;
1072         struct terminate_stats *term_stats = &fnic->fnic_stats.term_stats;
1073         struct misc_stats *misc_stats = &fnic->fnic_stats.misc_stats;
1074         unsigned long flags;
1075         spinlock_t *io_lock;
1076         unsigned long start_time;
1077
1078         fcpio_header_dec(&desc->hdr, &type, &hdr_status, &tag);
1079         fcpio_tag_id_dec(&tag, &id);
1080
1081         if ((id & FNIC_TAG_MASK) >= fnic->fnic_max_tag_id) {
1082                 shost_printk(KERN_ERR, fnic->lport->host,
1083                 "Tag out of range tag %x hdr status = %s\n",
1084                 id, fnic_fcpio_status_to_str(hdr_status));
1085                 return;
1086         }
1087
1088         sc = scsi_host_find_tag(fnic->lport->host, id & FNIC_TAG_MASK);
1089         WARN_ON_ONCE(!sc);
1090         if (!sc) {
1091                 atomic64_inc(&fnic_stats->io_stats.sc_null);
1092                 shost_printk(KERN_ERR, fnic->lport->host,
1093                           "itmf_cmpl sc is null - hdr status = %s tag = 0x%x\n",
1094                           fnic_fcpio_status_to_str(hdr_status), id);
1095                 return;
1096         }
1097         io_lock = fnic_io_lock_hash(fnic, sc);
1098         spin_lock_irqsave(io_lock, flags);
1099         io_req = (struct fnic_io_req *)CMD_SP(sc);
1100         WARN_ON_ONCE(!io_req);
1101         if (!io_req) {
1102                 atomic64_inc(&fnic_stats->io_stats.ioreq_null);
1103                 spin_unlock_irqrestore(io_lock, flags);
1104                 CMD_FLAGS(sc) |= FNIC_IO_ABT_TERM_REQ_NULL;
1105                 shost_printk(KERN_ERR, fnic->lport->host,
1106                           "itmf_cmpl io_req is null - "
1107                           "hdr status = %s tag = 0x%x sc 0x%p\n",
1108                           fnic_fcpio_status_to_str(hdr_status), id, sc);
1109                 return;
1110         }
1111         start_time = io_req->start_time;
1112
1113         if ((id & FNIC_TAG_ABORT) && (id & FNIC_TAG_DEV_RST)) {
1114                 /* Abort and terminate completion of device reset req */
1115                 /* REVISIT : Add asserts about various flags */
1116                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1117                               "dev reset abts cmpl recd. id %x status %s\n",
1118                               id, fnic_fcpio_status_to_str(hdr_status));
1119                 CMD_STATE(sc) = FNIC_IOREQ_ABTS_COMPLETE;
1120                 CMD_ABTS_STATUS(sc) = hdr_status;
1121                 CMD_FLAGS(sc) |= FNIC_DEV_RST_DONE;
1122                 if (io_req->abts_done)
1123                         complete(io_req->abts_done);
1124                 spin_unlock_irqrestore(io_lock, flags);
1125         } else if (id & FNIC_TAG_ABORT) {
1126                 /* Completion of abort cmd */
1127                 switch (hdr_status) {
1128                 case FCPIO_SUCCESS:
1129                         break;
1130                 case FCPIO_TIMEOUT:
1131                         if (CMD_FLAGS(sc) & FNIC_IO_ABTS_ISSUED)
1132                                 atomic64_inc(&abts_stats->abort_fw_timeouts);
1133                         else
1134                                 atomic64_inc(
1135                                         &term_stats->terminate_fw_timeouts);
1136                         break;
1137                 case FCPIO_ITMF_REJECTED:
1138                         FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host,
1139                                 "abort reject recd. id %d\n",
1140                                 (int)(id & FNIC_TAG_MASK));
1141                         break;
1142                 case FCPIO_IO_NOT_FOUND:
1143                         if (CMD_FLAGS(sc) & FNIC_IO_ABTS_ISSUED)
1144                                 atomic64_inc(&abts_stats->abort_io_not_found);
1145                         else
1146                                 atomic64_inc(
1147                                         &term_stats->terminate_io_not_found);
1148                         break;
1149                 default:
1150                         if (CMD_FLAGS(sc) & FNIC_IO_ABTS_ISSUED)
1151                                 atomic64_inc(&abts_stats->abort_failures);
1152                         else
1153                                 atomic64_inc(
1154                                         &term_stats->terminate_failures);
1155                         break;
1156                 }
1157                 if (CMD_STATE(sc) != FNIC_IOREQ_ABTS_PENDING) {
1158                         /* This is a late completion. Ignore it */
1159                         spin_unlock_irqrestore(io_lock, flags);
1160                         return;
1161                 }
1162
1163                 CMD_FLAGS(sc) |= FNIC_IO_ABT_TERM_DONE;
1164                 CMD_ABTS_STATUS(sc) = hdr_status;
1165
1166                 /* If the status is IO not found consider it as success */
1167                 if (hdr_status == FCPIO_IO_NOT_FOUND)
1168                         CMD_ABTS_STATUS(sc) = FCPIO_SUCCESS;
1169
1170                 if (!(CMD_FLAGS(sc) & (FNIC_IO_ABORTED | FNIC_IO_DONE)))
1171                         atomic64_inc(&misc_stats->no_icmnd_itmf_cmpls);
1172
1173                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1174                               "abts cmpl recd. id %d status %s\n",
1175                               (int)(id & FNIC_TAG_MASK),
1176                               fnic_fcpio_status_to_str(hdr_status));
1177
1178                 /*
1179                  * If scsi_eh thread is blocked waiting for abts to complete,
1180                  * signal completion to it. IO will be cleaned in the thread
1181                  * else clean it in this context
1182                  */
1183                 if (io_req->abts_done) {
1184                         complete(io_req->abts_done);
1185                         spin_unlock_irqrestore(io_lock, flags);
1186                 } else {
1187                         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1188                                       "abts cmpl, completing IO\n");
1189                         CMD_SP(sc) = NULL;
1190                         sc->result = (DID_ERROR << 16);
1191
1192                         spin_unlock_irqrestore(io_lock, flags);
1193
1194                         fnic_release_ioreq_buf(fnic, io_req, sc);
1195                         mempool_free(io_req, fnic->io_req_pool);
1196                         if (sc->scsi_done) {
1197                                 FNIC_TRACE(fnic_fcpio_itmf_cmpl_handler,
1198                                         sc->device->host->host_no, id,
1199                                         sc,
1200                                         jiffies_to_msecs(jiffies - start_time),
1201                                         desc,
1202                                         (((u64)hdr_status << 40) |
1203                                         (u64)sc->cmnd[0] << 32 |
1204                                         (u64)sc->cmnd[2] << 24 |
1205                                         (u64)sc->cmnd[3] << 16 |
1206                                         (u64)sc->cmnd[4] << 8 | sc->cmnd[5]),
1207                                         (((u64)CMD_FLAGS(sc) << 32) |
1208                                         CMD_STATE(sc)));
1209                                 sc->scsi_done(sc);
1210                                 atomic64_dec(&fnic_stats->io_stats.active_ios);
1211                                 if (atomic64_read(&fnic->io_cmpl_skip))
1212                                         atomic64_dec(&fnic->io_cmpl_skip);
1213                                 else
1214                                         atomic64_inc(&fnic_stats->io_stats.io_completions);
1215                         }
1216                 }
1217
1218         } else if (id & FNIC_TAG_DEV_RST) {
1219                 /* Completion of device reset */
1220                 CMD_LR_STATUS(sc) = hdr_status;
1221                 if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING) {
1222                         spin_unlock_irqrestore(io_lock, flags);
1223                         CMD_FLAGS(sc) |= FNIC_DEV_RST_ABTS_PENDING;
1224                         FNIC_TRACE(fnic_fcpio_itmf_cmpl_handler,
1225                                   sc->device->host->host_no, id, sc,
1226                                   jiffies_to_msecs(jiffies - start_time),
1227                                   desc, 0,
1228                                   (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc)));
1229                         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1230                                 "Terminate pending "
1231                                 "dev reset cmpl recd. id %d status %s\n",
1232                                 (int)(id & FNIC_TAG_MASK),
1233                                 fnic_fcpio_status_to_str(hdr_status));
1234                         return;
1235                 }
1236                 if (CMD_FLAGS(sc) & FNIC_DEV_RST_TIMED_OUT) {
1237                         /* Need to wait for terminate completion */
1238                         spin_unlock_irqrestore(io_lock, flags);
1239                         FNIC_TRACE(fnic_fcpio_itmf_cmpl_handler,
1240                                   sc->device->host->host_no, id, sc,
1241                                   jiffies_to_msecs(jiffies - start_time),
1242                                   desc, 0,
1243                                   (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc)));
1244                         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1245                                 "dev reset cmpl recd after time out. "
1246                                 "id %d status %s\n",
1247                                 (int)(id & FNIC_TAG_MASK),
1248                                 fnic_fcpio_status_to_str(hdr_status));
1249                         return;
1250                 }
1251                 CMD_STATE(sc) = FNIC_IOREQ_CMD_COMPLETE;
1252                 CMD_FLAGS(sc) |= FNIC_DEV_RST_DONE;
1253                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1254                               "dev reset cmpl recd. id %d status %s\n",
1255                               (int)(id & FNIC_TAG_MASK),
1256                               fnic_fcpio_status_to_str(hdr_status));
1257                 if (io_req->dr_done)
1258                         complete(io_req->dr_done);
1259                 spin_unlock_irqrestore(io_lock, flags);
1260
1261         } else {
1262                 shost_printk(KERN_ERR, fnic->lport->host,
1263                              "Unexpected itmf io state %s tag %x\n",
1264                              fnic_ioreq_state_to_str(CMD_STATE(sc)), id);
1265                 spin_unlock_irqrestore(io_lock, flags);
1266         }
1267
1268 }
1269
1270 /*
1271  * fnic_fcpio_cmpl_handler
1272  * Routine to service the cq for wq_copy
1273  */
1274 static int fnic_fcpio_cmpl_handler(struct vnic_dev *vdev,
1275                                    unsigned int cq_index,
1276                                    struct fcpio_fw_req *desc)
1277 {
1278         struct fnic *fnic = vnic_dev_priv(vdev);
1279
1280         switch (desc->hdr.type) {
1281         case FCPIO_ICMND_CMPL: /* fw completed a command */
1282         case FCPIO_ITMF_CMPL: /* fw completed itmf (abort cmd, lun reset)*/
1283         case FCPIO_FLOGI_REG_CMPL: /* fw completed flogi_reg */
1284         case FCPIO_FLOGI_FIP_REG_CMPL: /* fw completed flogi_fip_reg */
1285         case FCPIO_RESET_CMPL: /* fw completed reset */
1286                 atomic64_dec(&fnic->fnic_stats.fw_stats.active_fw_reqs);
1287                 break;
1288         default:
1289                 break;
1290         }
1291
1292         switch (desc->hdr.type) {
1293         case FCPIO_ACK: /* fw copied copy wq desc to its queue */
1294                 fnic_fcpio_ack_handler(fnic, cq_index, desc);
1295                 break;
1296
1297         case FCPIO_ICMND_CMPL: /* fw completed a command */
1298                 fnic_fcpio_icmnd_cmpl_handler(fnic, desc);
1299                 break;
1300
1301         case FCPIO_ITMF_CMPL: /* fw completed itmf (abort cmd, lun reset)*/
1302                 fnic_fcpio_itmf_cmpl_handler(fnic, desc);
1303                 break;
1304
1305         case FCPIO_FLOGI_REG_CMPL: /* fw completed flogi_reg */
1306         case FCPIO_FLOGI_FIP_REG_CMPL: /* fw completed flogi_fip_reg */
1307                 fnic_fcpio_flogi_reg_cmpl_handler(fnic, desc);
1308                 break;
1309
1310         case FCPIO_RESET_CMPL: /* fw completed reset */
1311                 fnic_fcpio_fw_reset_cmpl_handler(fnic, desc);
1312                 break;
1313
1314         default:
1315                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1316                               "firmware completion type %d\n",
1317                               desc->hdr.type);
1318                 break;
1319         }
1320
1321         return 0;
1322 }
1323
1324 /*
1325  * fnic_wq_copy_cmpl_handler
1326  * Routine to process wq copy
1327  */
1328 int fnic_wq_copy_cmpl_handler(struct fnic *fnic, int copy_work_to_do)
1329 {
1330         unsigned int wq_work_done = 0;
1331         unsigned int i, cq_index;
1332         unsigned int cur_work_done;
1333         struct misc_stats *misc_stats = &fnic->fnic_stats.misc_stats;
1334         u64 start_jiffies = 0;
1335         u64 end_jiffies = 0;
1336         u64 delta_jiffies = 0;
1337         u64 delta_ms = 0;
1338
1339         for (i = 0; i < fnic->wq_copy_count; i++) {
1340                 cq_index = i + fnic->raw_wq_count + fnic->rq_count;
1341
1342                 start_jiffies = jiffies;
1343                 cur_work_done = vnic_cq_copy_service(&fnic->cq[cq_index],
1344                                                      fnic_fcpio_cmpl_handler,
1345                                                      copy_work_to_do);
1346                 end_jiffies = jiffies;
1347
1348                 wq_work_done += cur_work_done;
1349                 delta_jiffies = end_jiffies - start_jiffies;
1350                 if (delta_jiffies >
1351                         (u64) atomic64_read(&misc_stats->max_isr_jiffies)) {
1352                         atomic64_set(&misc_stats->max_isr_jiffies,
1353                                         delta_jiffies);
1354                         delta_ms = jiffies_to_msecs(delta_jiffies);
1355                         atomic64_set(&misc_stats->max_isr_time_ms, delta_ms);
1356                         atomic64_set(&misc_stats->corr_work_done,
1357                                         cur_work_done);
1358                 }
1359         }
1360         return wq_work_done;
1361 }
1362
1363 static void fnic_cleanup_io(struct fnic *fnic, int exclude_id)
1364 {
1365         int i;
1366         struct fnic_io_req *io_req;
1367         unsigned long flags = 0;
1368         struct scsi_cmnd *sc;
1369         spinlock_t *io_lock;
1370         unsigned long start_time = 0;
1371         struct fnic_stats *fnic_stats = &fnic->fnic_stats;
1372
1373         for (i = 0; i < fnic->fnic_max_tag_id; i++) {
1374                 if (i == exclude_id)
1375                         continue;
1376
1377                 io_lock = fnic_io_lock_tag(fnic, i);
1378                 spin_lock_irqsave(io_lock, flags);
1379                 sc = scsi_host_find_tag(fnic->lport->host, i);
1380                 if (!sc) {
1381                         spin_unlock_irqrestore(io_lock, flags);
1382                         continue;
1383                 }
1384
1385                 io_req = (struct fnic_io_req *)CMD_SP(sc);
1386                 if ((CMD_FLAGS(sc) & FNIC_DEVICE_RESET) &&
1387                         !(CMD_FLAGS(sc) & FNIC_DEV_RST_DONE)) {
1388                         /*
1389                          * We will be here only when FW completes reset
1390                          * without sending completions for outstanding ios.
1391                          */
1392                         CMD_FLAGS(sc) |= FNIC_DEV_RST_DONE;
1393                         if (io_req && io_req->dr_done)
1394                                 complete(io_req->dr_done);
1395                         else if (io_req && io_req->abts_done)
1396                                 complete(io_req->abts_done);
1397                         spin_unlock_irqrestore(io_lock, flags);
1398                         continue;
1399                 } else if (CMD_FLAGS(sc) & FNIC_DEVICE_RESET) {
1400                         spin_unlock_irqrestore(io_lock, flags);
1401                         continue;
1402                 }
1403                 if (!io_req) {
1404                         spin_unlock_irqrestore(io_lock, flags);
1405                         goto cleanup_scsi_cmd;
1406                 }
1407
1408                 CMD_SP(sc) = NULL;
1409
1410                 spin_unlock_irqrestore(io_lock, flags);
1411
1412                 /*
1413                  * If there is a scsi_cmnd associated with this io_req, then
1414                  * free the corresponding state
1415                  */
1416                 start_time = io_req->start_time;
1417                 fnic_release_ioreq_buf(fnic, io_req, sc);
1418                 mempool_free(io_req, fnic->io_req_pool);
1419
1420 cleanup_scsi_cmd:
1421                 sc->result = DID_TRANSPORT_DISRUPTED << 16;
1422                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1423                               "%s: tag:0x%x : sc:0x%p duration = %lu DID_TRANSPORT_DISRUPTED\n",
1424                               __func__, sc->request->tag, sc,
1425                               (jiffies - start_time));
1426
1427                 if (atomic64_read(&fnic->io_cmpl_skip))
1428                         atomic64_dec(&fnic->io_cmpl_skip);
1429                 else
1430                         atomic64_inc(&fnic_stats->io_stats.io_completions);
1431
1432                 /* Complete the command to SCSI */
1433                 if (sc->scsi_done) {
1434                         if (!(CMD_FLAGS(sc) & FNIC_IO_ISSUED))
1435                                 shost_printk(KERN_ERR, fnic->lport->host,
1436                                 "Calling done for IO not issued to fw: tag:0x%x sc:0x%p\n",
1437                                  sc->request->tag, sc);
1438
1439                         FNIC_TRACE(fnic_cleanup_io,
1440                                   sc->device->host->host_no, i, sc,
1441                                   jiffies_to_msecs(jiffies - start_time),
1442                                   0, ((u64)sc->cmnd[0] << 32 |
1443                                   (u64)sc->cmnd[2] << 24 |
1444                                   (u64)sc->cmnd[3] << 16 |
1445                                   (u64)sc->cmnd[4] << 8 | sc->cmnd[5]),
1446                                   (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc)));
1447
1448                         sc->scsi_done(sc);
1449                 }
1450         }
1451 }
1452
1453 void fnic_wq_copy_cleanup_handler(struct vnic_wq_copy *wq,
1454                                   struct fcpio_host_req *desc)
1455 {
1456         u32 id;
1457         struct fnic *fnic = vnic_dev_priv(wq->vdev);
1458         struct fnic_io_req *io_req;
1459         struct scsi_cmnd *sc;
1460         unsigned long flags;
1461         spinlock_t *io_lock;
1462         unsigned long start_time = 0;
1463
1464         /* get the tag reference */
1465         fcpio_tag_id_dec(&desc->hdr.tag, &id);
1466         id &= FNIC_TAG_MASK;
1467
1468         if (id >= fnic->fnic_max_tag_id)
1469                 return;
1470
1471         sc = scsi_host_find_tag(fnic->lport->host, id);
1472         if (!sc)
1473                 return;
1474
1475         io_lock = fnic_io_lock_hash(fnic, sc);
1476         spin_lock_irqsave(io_lock, flags);
1477
1478         /* Get the IO context which this desc refers to */
1479         io_req = (struct fnic_io_req *)CMD_SP(sc);
1480
1481         /* fnic interrupts are turned off by now */
1482
1483         if (!io_req) {
1484                 spin_unlock_irqrestore(io_lock, flags);
1485                 goto wq_copy_cleanup_scsi_cmd;
1486         }
1487
1488         CMD_SP(sc) = NULL;
1489
1490         spin_unlock_irqrestore(io_lock, flags);
1491
1492         start_time = io_req->start_time;
1493         fnic_release_ioreq_buf(fnic, io_req, sc);
1494         mempool_free(io_req, fnic->io_req_pool);
1495
1496 wq_copy_cleanup_scsi_cmd:
1497         sc->result = DID_NO_CONNECT << 16;
1498         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host, "wq_copy_cleanup_handler:"
1499                       " DID_NO_CONNECT\n");
1500
1501         if (sc->scsi_done) {
1502                 FNIC_TRACE(fnic_wq_copy_cleanup_handler,
1503                           sc->device->host->host_no, id, sc,
1504                           jiffies_to_msecs(jiffies - start_time),
1505                           0, ((u64)sc->cmnd[0] << 32 |
1506                           (u64)sc->cmnd[2] << 24 | (u64)sc->cmnd[3] << 16 |
1507                           (u64)sc->cmnd[4] << 8 | sc->cmnd[5]),
1508                           (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc)));
1509
1510                 sc->scsi_done(sc);
1511         }
1512 }
1513
1514 static inline int fnic_queue_abort_io_req(struct fnic *fnic, int tag,
1515                                           u32 task_req, u8 *fc_lun,
1516                                           struct fnic_io_req *io_req)
1517 {
1518         struct vnic_wq_copy *wq = &fnic->wq_copy[0];
1519         struct Scsi_Host *host = fnic->lport->host;
1520         struct misc_stats *misc_stats = &fnic->fnic_stats.misc_stats;
1521         unsigned long flags;
1522
1523         spin_lock_irqsave(host->host_lock, flags);
1524         if (unlikely(fnic_chk_state_flags_locked(fnic,
1525                                                 FNIC_FLAGS_IO_BLOCKED))) {
1526                 spin_unlock_irqrestore(host->host_lock, flags);
1527                 return 1;
1528         } else
1529                 atomic_inc(&fnic->in_flight);
1530         spin_unlock_irqrestore(host->host_lock, flags);
1531
1532         spin_lock_irqsave(&fnic->wq_copy_lock[0], flags);
1533
1534         if (vnic_wq_copy_desc_avail(wq) <= fnic->wq_copy_desc_low[0])
1535                 free_wq_copy_descs(fnic, wq);
1536
1537         if (!vnic_wq_copy_desc_avail(wq)) {
1538                 spin_unlock_irqrestore(&fnic->wq_copy_lock[0], flags);
1539                 atomic_dec(&fnic->in_flight);
1540                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1541                         "fnic_queue_abort_io_req: failure: no descriptors\n");
1542                 atomic64_inc(&misc_stats->abts_cpwq_alloc_failures);
1543                 return 1;
1544         }
1545         fnic_queue_wq_copy_desc_itmf(wq, tag | FNIC_TAG_ABORT,
1546                                      0, task_req, tag, fc_lun, io_req->port_id,
1547                                      fnic->config.ra_tov, fnic->config.ed_tov);
1548
1549         atomic64_inc(&fnic->fnic_stats.fw_stats.active_fw_reqs);
1550         if (atomic64_read(&fnic->fnic_stats.fw_stats.active_fw_reqs) >
1551                   atomic64_read(&fnic->fnic_stats.fw_stats.max_fw_reqs))
1552                 atomic64_set(&fnic->fnic_stats.fw_stats.max_fw_reqs,
1553                   atomic64_read(&fnic->fnic_stats.fw_stats.active_fw_reqs));
1554
1555         spin_unlock_irqrestore(&fnic->wq_copy_lock[0], flags);
1556         atomic_dec(&fnic->in_flight);
1557
1558         return 0;
1559 }
1560
1561 static void fnic_rport_exch_reset(struct fnic *fnic, u32 port_id)
1562 {
1563         int tag;
1564         int abt_tag;
1565         int term_cnt = 0;
1566         struct fnic_io_req *io_req;
1567         spinlock_t *io_lock;
1568         unsigned long flags;
1569         struct scsi_cmnd *sc;
1570         struct reset_stats *reset_stats = &fnic->fnic_stats.reset_stats;
1571         struct terminate_stats *term_stats = &fnic->fnic_stats.term_stats;
1572         struct scsi_lun fc_lun;
1573         enum fnic_ioreq_state old_ioreq_state;
1574
1575         FNIC_SCSI_DBG(KERN_DEBUG,
1576                       fnic->lport->host,
1577                       "fnic_rport_exch_reset called portid 0x%06x\n",
1578                       port_id);
1579
1580         if (fnic->in_remove)
1581                 return;
1582
1583         for (tag = 0; tag < fnic->fnic_max_tag_id; tag++) {
1584                 abt_tag = tag;
1585                 io_lock = fnic_io_lock_tag(fnic, tag);
1586                 spin_lock_irqsave(io_lock, flags);
1587                 sc = scsi_host_find_tag(fnic->lport->host, tag);
1588                 if (!sc) {
1589                         spin_unlock_irqrestore(io_lock, flags);
1590                         continue;
1591                 }
1592
1593                 io_req = (struct fnic_io_req *)CMD_SP(sc);
1594
1595                 if (!io_req || io_req->port_id != port_id) {
1596                         spin_unlock_irqrestore(io_lock, flags);
1597                         continue;
1598                 }
1599
1600                 if ((CMD_FLAGS(sc) & FNIC_DEVICE_RESET) &&
1601                         (!(CMD_FLAGS(sc) & FNIC_DEV_RST_ISSUED))) {
1602                         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1603                         "fnic_rport_exch_reset dev rst not pending sc 0x%p\n",
1604                         sc);
1605                         spin_unlock_irqrestore(io_lock, flags);
1606                         continue;
1607                 }
1608
1609                 /*
1610                  * Found IO that is still pending with firmware and
1611                  * belongs to rport that went away
1612                  */
1613                 if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING) {
1614                         spin_unlock_irqrestore(io_lock, flags);
1615                         continue;
1616                 }
1617                 if (io_req->abts_done) {
1618                         shost_printk(KERN_ERR, fnic->lport->host,
1619                         "fnic_rport_exch_reset: io_req->abts_done is set "
1620                         "state is %s\n",
1621                         fnic_ioreq_state_to_str(CMD_STATE(sc)));
1622                 }
1623
1624                 if (!(CMD_FLAGS(sc) & FNIC_IO_ISSUED)) {
1625                         shost_printk(KERN_ERR, fnic->lport->host,
1626                                   "rport_exch_reset "
1627                                   "IO not yet issued %p tag 0x%x flags "
1628                                   "%x state %d\n",
1629                                   sc, tag, CMD_FLAGS(sc), CMD_STATE(sc));
1630                 }
1631                 old_ioreq_state = CMD_STATE(sc);
1632                 CMD_STATE(sc) = FNIC_IOREQ_ABTS_PENDING;
1633                 CMD_ABTS_STATUS(sc) = FCPIO_INVALID_CODE;
1634                 if (CMD_FLAGS(sc) & FNIC_DEVICE_RESET) {
1635                         atomic64_inc(&reset_stats->device_reset_terminates);
1636                         abt_tag = (tag | FNIC_TAG_DEV_RST);
1637                         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1638                         "fnic_rport_exch_reset dev rst sc 0x%p\n",
1639                         sc);
1640                 }
1641
1642                 BUG_ON(io_req->abts_done);
1643
1644                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1645                               "fnic_rport_reset_exch: Issuing abts\n");
1646
1647                 spin_unlock_irqrestore(io_lock, flags);
1648
1649                 /* Now queue the abort command to firmware */
1650                 int_to_scsilun(sc->device->lun, &fc_lun);
1651
1652                 if (fnic_queue_abort_io_req(fnic, abt_tag,
1653                                             FCPIO_ITMF_ABT_TASK_TERM,
1654                                             fc_lun.scsi_lun, io_req)) {
1655                         /*
1656                          * Revert the cmd state back to old state, if
1657                          * it hasn't changed in between. This cmd will get
1658                          * aborted later by scsi_eh, or cleaned up during
1659                          * lun reset
1660                          */
1661                         spin_lock_irqsave(io_lock, flags);
1662                         if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING)
1663                                 CMD_STATE(sc) = old_ioreq_state;
1664                         spin_unlock_irqrestore(io_lock, flags);
1665                 } else {
1666                         spin_lock_irqsave(io_lock, flags);
1667                         if (CMD_FLAGS(sc) & FNIC_DEVICE_RESET)
1668                                 CMD_FLAGS(sc) |= FNIC_DEV_RST_TERM_ISSUED;
1669                         else
1670                                 CMD_FLAGS(sc) |= FNIC_IO_INTERNAL_TERM_ISSUED;
1671                         spin_unlock_irqrestore(io_lock, flags);
1672                         atomic64_inc(&term_stats->terminates);
1673                         term_cnt++;
1674                 }
1675         }
1676         if (term_cnt > atomic64_read(&term_stats->max_terminates))
1677                 atomic64_set(&term_stats->max_terminates, term_cnt);
1678
1679 }
1680
1681 void fnic_terminate_rport_io(struct fc_rport *rport)
1682 {
1683         int tag;
1684         int abt_tag;
1685         int term_cnt = 0;
1686         struct fnic_io_req *io_req;
1687         spinlock_t *io_lock;
1688         unsigned long flags;
1689         struct scsi_cmnd *sc;
1690         struct scsi_lun fc_lun;
1691         struct fc_rport_libfc_priv *rdata;
1692         struct fc_lport *lport;
1693         struct fnic *fnic;
1694         struct fc_rport *cmd_rport;
1695         struct reset_stats *reset_stats;
1696         struct terminate_stats *term_stats;
1697         enum fnic_ioreq_state old_ioreq_state;
1698
1699         if (!rport) {
1700                 printk(KERN_ERR "fnic_terminate_rport_io: rport is NULL\n");
1701                 return;
1702         }
1703         rdata = rport->dd_data;
1704
1705         if (!rdata) {
1706                 printk(KERN_ERR "fnic_terminate_rport_io: rdata is NULL\n");
1707                 return;
1708         }
1709         lport = rdata->local_port;
1710
1711         if (!lport) {
1712                 printk(KERN_ERR "fnic_terminate_rport_io: lport is NULL\n");
1713                 return;
1714         }
1715         fnic = lport_priv(lport);
1716         FNIC_SCSI_DBG(KERN_DEBUG,
1717                       fnic->lport->host, "fnic_terminate_rport_io called"
1718                       " wwpn 0x%llx, wwnn0x%llx, rport 0x%p, portid 0x%06x\n",
1719                       rport->port_name, rport->node_name, rport,
1720                       rport->port_id);
1721
1722         if (fnic->in_remove)
1723                 return;
1724
1725         reset_stats = &fnic->fnic_stats.reset_stats;
1726         term_stats = &fnic->fnic_stats.term_stats;
1727
1728         for (tag = 0; tag < fnic->fnic_max_tag_id; tag++) {
1729                 abt_tag = tag;
1730                 io_lock = fnic_io_lock_tag(fnic, tag);
1731                 spin_lock_irqsave(io_lock, flags);
1732                 sc = scsi_host_find_tag(fnic->lport->host, tag);
1733                 if (!sc) {
1734                         spin_unlock_irqrestore(io_lock, flags);
1735                         continue;
1736                 }
1737
1738                 cmd_rport = starget_to_rport(scsi_target(sc->device));
1739                 if (rport != cmd_rport) {
1740                         spin_unlock_irqrestore(io_lock, flags);
1741                         continue;
1742                 }
1743
1744                 io_req = (struct fnic_io_req *)CMD_SP(sc);
1745
1746                 if (!io_req || rport != cmd_rport) {
1747                         spin_unlock_irqrestore(io_lock, flags);
1748                         continue;
1749                 }
1750
1751                 if ((CMD_FLAGS(sc) & FNIC_DEVICE_RESET) &&
1752                         (!(CMD_FLAGS(sc) & FNIC_DEV_RST_ISSUED))) {
1753                         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1754                         "fnic_terminate_rport_io dev rst not pending sc 0x%p\n",
1755                         sc);
1756                         spin_unlock_irqrestore(io_lock, flags);
1757                         continue;
1758                 }
1759                 /*
1760                  * Found IO that is still pending with firmware and
1761                  * belongs to rport that went away
1762                  */
1763                 if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING) {
1764                         spin_unlock_irqrestore(io_lock, flags);
1765                         continue;
1766                 }
1767                 if (io_req->abts_done) {
1768                         shost_printk(KERN_ERR, fnic->lport->host,
1769                         "fnic_terminate_rport_io: io_req->abts_done is set "
1770                         "state is %s\n",
1771                         fnic_ioreq_state_to_str(CMD_STATE(sc)));
1772                 }
1773                 if (!(CMD_FLAGS(sc) & FNIC_IO_ISSUED)) {
1774                         FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host,
1775                                   "fnic_terminate_rport_io "
1776                                   "IO not yet issued %p tag 0x%x flags "
1777                                   "%x state %d\n",
1778                                   sc, tag, CMD_FLAGS(sc), CMD_STATE(sc));
1779                 }
1780                 old_ioreq_state = CMD_STATE(sc);
1781                 CMD_STATE(sc) = FNIC_IOREQ_ABTS_PENDING;
1782                 CMD_ABTS_STATUS(sc) = FCPIO_INVALID_CODE;
1783                 if (CMD_FLAGS(sc) & FNIC_DEVICE_RESET) {
1784                         atomic64_inc(&reset_stats->device_reset_terminates);
1785                         abt_tag = (tag | FNIC_TAG_DEV_RST);
1786                         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1787                         "fnic_terminate_rport_io dev rst sc 0x%p\n", sc);
1788                 }
1789
1790                 BUG_ON(io_req->abts_done);
1791
1792                 FNIC_SCSI_DBG(KERN_DEBUG,
1793                               fnic->lport->host,
1794                               "fnic_terminate_rport_io: Issuing abts\n");
1795
1796                 spin_unlock_irqrestore(io_lock, flags);
1797
1798                 /* Now queue the abort command to firmware */
1799                 int_to_scsilun(sc->device->lun, &fc_lun);
1800
1801                 if (fnic_queue_abort_io_req(fnic, abt_tag,
1802                                             FCPIO_ITMF_ABT_TASK_TERM,
1803                                             fc_lun.scsi_lun, io_req)) {
1804                         /*
1805                          * Revert the cmd state back to old state, if
1806                          * it hasn't changed in between. This cmd will get
1807                          * aborted later by scsi_eh, or cleaned up during
1808                          * lun reset
1809                          */
1810                         spin_lock_irqsave(io_lock, flags);
1811                         if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING)
1812                                 CMD_STATE(sc) = old_ioreq_state;
1813                         spin_unlock_irqrestore(io_lock, flags);
1814                 } else {
1815                         spin_lock_irqsave(io_lock, flags);
1816                         if (CMD_FLAGS(sc) & FNIC_DEVICE_RESET)
1817                                 CMD_FLAGS(sc) |= FNIC_DEV_RST_TERM_ISSUED;
1818                         else
1819                                 CMD_FLAGS(sc) |= FNIC_IO_INTERNAL_TERM_ISSUED;
1820                         spin_unlock_irqrestore(io_lock, flags);
1821                         atomic64_inc(&term_stats->terminates);
1822                         term_cnt++;
1823                 }
1824         }
1825         if (term_cnt > atomic64_read(&term_stats->max_terminates))
1826                 atomic64_set(&term_stats->max_terminates, term_cnt);
1827
1828 }
1829
1830 /*
1831  * This function is exported to SCSI for sending abort cmnds.
1832  * A SCSI IO is represented by a io_req in the driver.
1833  * The ioreq is linked to the SCSI Cmd, thus a link with the ULP's IO.
1834  */
1835 int fnic_abort_cmd(struct scsi_cmnd *sc)
1836 {
1837         struct fc_lport *lp;
1838         struct fnic *fnic;
1839         struct fnic_io_req *io_req = NULL;
1840         struct fc_rport *rport;
1841         spinlock_t *io_lock;
1842         unsigned long flags;
1843         unsigned long start_time = 0;
1844         int ret = SUCCESS;
1845         u32 task_req = 0;
1846         struct scsi_lun fc_lun;
1847         struct fnic_stats *fnic_stats;
1848         struct abort_stats *abts_stats;
1849         struct terminate_stats *term_stats;
1850         enum fnic_ioreq_state old_ioreq_state;
1851         int tag;
1852         unsigned long abt_issued_time;
1853         DECLARE_COMPLETION_ONSTACK(tm_done);
1854
1855         /* Wait for rport to unblock */
1856         fc_block_scsi_eh(sc);
1857
1858         /* Get local-port, check ready and link up */
1859         lp = shost_priv(sc->device->host);
1860
1861         fnic = lport_priv(lp);
1862         fnic_stats = &fnic->fnic_stats;
1863         abts_stats = &fnic->fnic_stats.abts_stats;
1864         term_stats = &fnic->fnic_stats.term_stats;
1865
1866         rport = starget_to_rport(scsi_target(sc->device));
1867         tag = sc->request->tag;
1868         FNIC_SCSI_DBG(KERN_DEBUG,
1869                 fnic->lport->host,
1870                 "Abort Cmd called FCID 0x%x, LUN 0x%llx TAG %x flags %x\n",
1871                 rport->port_id, sc->device->lun, tag, CMD_FLAGS(sc));
1872
1873         CMD_FLAGS(sc) = FNIC_NO_FLAGS;
1874
1875         if (lp->state != LPORT_ST_READY || !(lp->link_up)) {
1876                 ret = FAILED;
1877                 goto fnic_abort_cmd_end;
1878         }
1879
1880         /*
1881          * Avoid a race between SCSI issuing the abort and the device
1882          * completing the command.
1883          *
1884          * If the command is already completed by the fw cmpl code,
1885          * we just return SUCCESS from here. This means that the abort
1886          * succeeded. In the SCSI ML, since the timeout for command has
1887          * happened, the completion wont actually complete the command
1888          * and it will be considered as an aborted command
1889          *
1890          * The CMD_SP will not be cleared except while holding io_req_lock.
1891          */
1892         io_lock = fnic_io_lock_hash(fnic, sc);
1893         spin_lock_irqsave(io_lock, flags);
1894         io_req = (struct fnic_io_req *)CMD_SP(sc);
1895         if (!io_req) {
1896                 spin_unlock_irqrestore(io_lock, flags);
1897                 goto fnic_abort_cmd_end;
1898         }
1899
1900         io_req->abts_done = &tm_done;
1901
1902         if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING) {
1903                 spin_unlock_irqrestore(io_lock, flags);
1904                 goto wait_pending;
1905         }
1906
1907         abt_issued_time = jiffies_to_msecs(jiffies) - jiffies_to_msecs(io_req->start_time);
1908         if (abt_issued_time <= 6000)
1909                 atomic64_inc(&abts_stats->abort_issued_btw_0_to_6_sec);
1910         else if (abt_issued_time > 6000 && abt_issued_time <= 20000)
1911                 atomic64_inc(&abts_stats->abort_issued_btw_6_to_20_sec);
1912         else if (abt_issued_time > 20000 && abt_issued_time <= 30000)
1913                 atomic64_inc(&abts_stats->abort_issued_btw_20_to_30_sec);
1914         else if (abt_issued_time > 30000 && abt_issued_time <= 40000)
1915                 atomic64_inc(&abts_stats->abort_issued_btw_30_to_40_sec);
1916         else if (abt_issued_time > 40000 && abt_issued_time <= 50000)
1917                 atomic64_inc(&abts_stats->abort_issued_btw_40_to_50_sec);
1918         else if (abt_issued_time > 50000 && abt_issued_time <= 60000)
1919                 atomic64_inc(&abts_stats->abort_issued_btw_50_to_60_sec);
1920         else
1921                 atomic64_inc(&abts_stats->abort_issued_greater_than_60_sec);
1922
1923         FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host,
1924                 "CBD Opcode: %02x Abort issued time: %lu msec\n", sc->cmnd[0], abt_issued_time);
1925         /*
1926          * Command is still pending, need to abort it
1927          * If the firmware completes the command after this point,
1928          * the completion wont be done till mid-layer, since abort
1929          * has already started.
1930          */
1931         old_ioreq_state = CMD_STATE(sc);
1932         CMD_STATE(sc) = FNIC_IOREQ_ABTS_PENDING;
1933         CMD_ABTS_STATUS(sc) = FCPIO_INVALID_CODE;
1934
1935         spin_unlock_irqrestore(io_lock, flags);
1936
1937         /*
1938          * Check readiness of the remote port. If the path to remote
1939          * port is up, then send abts to the remote port to terminate
1940          * the IO. Else, just locally terminate the IO in the firmware
1941          */
1942         if (fc_remote_port_chkready(rport) == 0)
1943                 task_req = FCPIO_ITMF_ABT_TASK;
1944         else {
1945                 atomic64_inc(&fnic_stats->misc_stats.rport_not_ready);
1946                 task_req = FCPIO_ITMF_ABT_TASK_TERM;
1947         }
1948
1949         /* Now queue the abort command to firmware */
1950         int_to_scsilun(sc->device->lun, &fc_lun);
1951
1952         if (fnic_queue_abort_io_req(fnic, sc->request->tag, task_req,
1953                                     fc_lun.scsi_lun, io_req)) {
1954                 spin_lock_irqsave(io_lock, flags);
1955                 if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING)
1956                         CMD_STATE(sc) = old_ioreq_state;
1957                 io_req = (struct fnic_io_req *)CMD_SP(sc);
1958                 if (io_req)
1959                         io_req->abts_done = NULL;
1960                 spin_unlock_irqrestore(io_lock, flags);
1961                 ret = FAILED;
1962                 goto fnic_abort_cmd_end;
1963         }
1964         if (task_req == FCPIO_ITMF_ABT_TASK) {
1965                 CMD_FLAGS(sc) |= FNIC_IO_ABTS_ISSUED;
1966                 atomic64_inc(&fnic_stats->abts_stats.aborts);
1967         } else {
1968                 CMD_FLAGS(sc) |= FNIC_IO_TERM_ISSUED;
1969                 atomic64_inc(&fnic_stats->term_stats.terminates);
1970         }
1971
1972         /*
1973          * We queued an abort IO, wait for its completion.
1974          * Once the firmware completes the abort command, it will
1975          * wake up this thread.
1976          */
1977  wait_pending:
1978         wait_for_completion_timeout(&tm_done,
1979                                     msecs_to_jiffies
1980                                     (2 * fnic->config.ra_tov +
1981                                      fnic->config.ed_tov));
1982
1983         /* Check the abort status */
1984         spin_lock_irqsave(io_lock, flags);
1985
1986         io_req = (struct fnic_io_req *)CMD_SP(sc);
1987         if (!io_req) {
1988                 atomic64_inc(&fnic_stats->io_stats.ioreq_null);
1989                 spin_unlock_irqrestore(io_lock, flags);
1990                 CMD_FLAGS(sc) |= FNIC_IO_ABT_TERM_REQ_NULL;
1991                 ret = FAILED;
1992                 goto fnic_abort_cmd_end;
1993         }
1994         io_req->abts_done = NULL;
1995
1996         /* fw did not complete abort, timed out */
1997         if (CMD_ABTS_STATUS(sc) == FCPIO_INVALID_CODE) {
1998                 spin_unlock_irqrestore(io_lock, flags);
1999                 if (task_req == FCPIO_ITMF_ABT_TASK) {
2000                         atomic64_inc(&abts_stats->abort_drv_timeouts);
2001                 } else {
2002                         atomic64_inc(&term_stats->terminate_drv_timeouts);
2003                 }
2004                 CMD_FLAGS(sc) |= FNIC_IO_ABT_TERM_TIMED_OUT;
2005                 ret = FAILED;
2006                 goto fnic_abort_cmd_end;
2007         }
2008
2009         /* IO out of order */
2010
2011         if (!(CMD_FLAGS(sc) & (FNIC_IO_ABORTED | FNIC_IO_DONE))) {
2012                 spin_unlock_irqrestore(io_lock, flags);
2013                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2014                         "Issuing Host reset due to out of order IO\n");
2015
2016                 ret = FAILED;
2017                 goto fnic_abort_cmd_end;
2018         }
2019
2020         CMD_STATE(sc) = FNIC_IOREQ_ABTS_COMPLETE;
2021
2022         start_time = io_req->start_time;
2023         /*
2024          * firmware completed the abort, check the status,
2025          * free the io_req if successful. If abort fails,
2026          * Device reset will clean the I/O.
2027          */
2028         if (CMD_ABTS_STATUS(sc) == FCPIO_SUCCESS)
2029                 CMD_SP(sc) = NULL;
2030         else {
2031                 ret = FAILED;
2032                 spin_unlock_irqrestore(io_lock, flags);
2033                 goto fnic_abort_cmd_end;
2034         }
2035
2036         spin_unlock_irqrestore(io_lock, flags);
2037
2038         fnic_release_ioreq_buf(fnic, io_req, sc);
2039         mempool_free(io_req, fnic->io_req_pool);
2040
2041         if (sc->scsi_done) {
2042         /* Call SCSI completion function to complete the IO */
2043                 sc->result = (DID_ABORT << 16);
2044                 sc->scsi_done(sc);
2045                 atomic64_dec(&fnic_stats->io_stats.active_ios);
2046                 if (atomic64_read(&fnic->io_cmpl_skip))
2047                         atomic64_dec(&fnic->io_cmpl_skip);
2048                 else
2049                         atomic64_inc(&fnic_stats->io_stats.io_completions);
2050         }
2051
2052 fnic_abort_cmd_end:
2053         FNIC_TRACE(fnic_abort_cmd, sc->device->host->host_no,
2054                   sc->request->tag, sc,
2055                   jiffies_to_msecs(jiffies - start_time),
2056                   0, ((u64)sc->cmnd[0] << 32 |
2057                   (u64)sc->cmnd[2] << 24 | (u64)sc->cmnd[3] << 16 |
2058                   (u64)sc->cmnd[4] << 8 | sc->cmnd[5]),
2059                   (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc)));
2060
2061         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2062                       "Returning from abort cmd type %x %s\n", task_req,
2063                       (ret == SUCCESS) ?
2064                       "SUCCESS" : "FAILED");
2065         return ret;
2066 }
2067
2068 static inline int fnic_queue_dr_io_req(struct fnic *fnic,
2069                                        struct scsi_cmnd *sc,
2070                                        struct fnic_io_req *io_req)
2071 {
2072         struct vnic_wq_copy *wq = &fnic->wq_copy[0];
2073         struct Scsi_Host *host = fnic->lport->host;
2074         struct misc_stats *misc_stats = &fnic->fnic_stats.misc_stats;
2075         struct scsi_lun fc_lun;
2076         int ret = 0;
2077         unsigned long intr_flags;
2078
2079         spin_lock_irqsave(host->host_lock, intr_flags);
2080         if (unlikely(fnic_chk_state_flags_locked(fnic,
2081                                                 FNIC_FLAGS_IO_BLOCKED))) {
2082                 spin_unlock_irqrestore(host->host_lock, intr_flags);
2083                 return FAILED;
2084         } else
2085                 atomic_inc(&fnic->in_flight);
2086         spin_unlock_irqrestore(host->host_lock, intr_flags);
2087
2088         spin_lock_irqsave(&fnic->wq_copy_lock[0], intr_flags);
2089
2090         if (vnic_wq_copy_desc_avail(wq) <= fnic->wq_copy_desc_low[0])
2091                 free_wq_copy_descs(fnic, wq);
2092
2093         if (!vnic_wq_copy_desc_avail(wq)) {
2094                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2095                           "queue_dr_io_req failure - no descriptors\n");
2096                 atomic64_inc(&misc_stats->devrst_cpwq_alloc_failures);
2097                 ret = -EAGAIN;
2098                 goto lr_io_req_end;
2099         }
2100
2101         /* fill in the lun info */
2102         int_to_scsilun(sc->device->lun, &fc_lun);
2103
2104         fnic_queue_wq_copy_desc_itmf(wq, sc->request->tag | FNIC_TAG_DEV_RST,
2105                                      0, FCPIO_ITMF_LUN_RESET, SCSI_NO_TAG,
2106                                      fc_lun.scsi_lun, io_req->port_id,
2107                                      fnic->config.ra_tov, fnic->config.ed_tov);
2108
2109         atomic64_inc(&fnic->fnic_stats.fw_stats.active_fw_reqs);
2110         if (atomic64_read(&fnic->fnic_stats.fw_stats.active_fw_reqs) >
2111                   atomic64_read(&fnic->fnic_stats.fw_stats.max_fw_reqs))
2112                 atomic64_set(&fnic->fnic_stats.fw_stats.max_fw_reqs,
2113                   atomic64_read(&fnic->fnic_stats.fw_stats.active_fw_reqs));
2114
2115 lr_io_req_end:
2116         spin_unlock_irqrestore(&fnic->wq_copy_lock[0], intr_flags);
2117         atomic_dec(&fnic->in_flight);
2118
2119         return ret;
2120 }
2121
2122 /*
2123  * Clean up any pending aborts on the lun
2124  * For each outstanding IO on this lun, whose abort is not completed by fw,
2125  * issue a local abort. Wait for abort to complete. Return 0 if all commands
2126  * successfully aborted, 1 otherwise
2127  */
2128 static int fnic_clean_pending_aborts(struct fnic *fnic,
2129                                      struct scsi_cmnd *lr_sc,
2130                                          bool new_sc)
2131
2132 {
2133         int tag, abt_tag;
2134         struct fnic_io_req *io_req;
2135         spinlock_t *io_lock;
2136         unsigned long flags;
2137         int ret = 0;
2138         struct scsi_cmnd *sc;
2139         struct scsi_lun fc_lun;
2140         struct scsi_device *lun_dev = lr_sc->device;
2141         DECLARE_COMPLETION_ONSTACK(tm_done);
2142         enum fnic_ioreq_state old_ioreq_state;
2143
2144         for (tag = 0; tag < fnic->fnic_max_tag_id; tag++) {
2145                 io_lock = fnic_io_lock_tag(fnic, tag);
2146                 spin_lock_irqsave(io_lock, flags);
2147                 sc = scsi_host_find_tag(fnic->lport->host, tag);
2148                 /*
2149                  * ignore this lun reset cmd if issued using new SC
2150                  * or cmds that do not belong to this lun
2151                  */
2152                 if (!sc || ((sc == lr_sc) && new_sc) || sc->device != lun_dev) {
2153                         spin_unlock_irqrestore(io_lock, flags);
2154                         continue;
2155                 }
2156
2157                 io_req = (struct fnic_io_req *)CMD_SP(sc);
2158
2159                 if (!io_req || sc->device != lun_dev) {
2160                         spin_unlock_irqrestore(io_lock, flags);
2161                         continue;
2162                 }
2163
2164                 /*
2165                  * Found IO that is still pending with firmware and
2166                  * belongs to the LUN that we are resetting
2167                  */
2168                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2169                               "Found IO in %s on lun\n",
2170                               fnic_ioreq_state_to_str(CMD_STATE(sc)));
2171
2172                 if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING) {
2173                         spin_unlock_irqrestore(io_lock, flags);
2174                         continue;
2175                 }
2176                 if ((CMD_FLAGS(sc) & FNIC_DEVICE_RESET) &&
2177                         (!(CMD_FLAGS(sc) & FNIC_DEV_RST_ISSUED))) {
2178                         FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host,
2179                                 "%s dev rst not pending sc 0x%p\n", __func__,
2180                                 sc);
2181                         spin_unlock_irqrestore(io_lock, flags);
2182                         continue;
2183                 }
2184
2185                 if (io_req->abts_done)
2186                         shost_printk(KERN_ERR, fnic->lport->host,
2187                           "%s: io_req->abts_done is set state is %s\n",
2188                           __func__, fnic_ioreq_state_to_str(CMD_STATE(sc)));
2189                 old_ioreq_state = CMD_STATE(sc);
2190                 /*
2191                  * Any pending IO issued prior to reset is expected to be
2192                  * in abts pending state, if not we need to set
2193                  * FNIC_IOREQ_ABTS_PENDING to indicate the IO is abort pending.
2194                  * When IO is completed, the IO will be handed over and
2195                  * handled in this function.
2196                  */
2197                 CMD_STATE(sc) = FNIC_IOREQ_ABTS_PENDING;
2198
2199                 BUG_ON(io_req->abts_done);
2200
2201                 abt_tag = tag;
2202                 if (CMD_FLAGS(sc) & FNIC_DEVICE_RESET) {
2203                         abt_tag |= FNIC_TAG_DEV_RST;
2204                         FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host,
2205                                   "%s: dev rst sc 0x%p\n", __func__, sc);
2206                 }
2207
2208                 CMD_ABTS_STATUS(sc) = FCPIO_INVALID_CODE;
2209                 io_req->abts_done = &tm_done;
2210                 spin_unlock_irqrestore(io_lock, flags);
2211
2212                 /* Now queue the abort command to firmware */
2213                 int_to_scsilun(sc->device->lun, &fc_lun);
2214
2215                 if (fnic_queue_abort_io_req(fnic, abt_tag,
2216                                             FCPIO_ITMF_ABT_TASK_TERM,
2217                                             fc_lun.scsi_lun, io_req)) {
2218                         spin_lock_irqsave(io_lock, flags);
2219                         io_req = (struct fnic_io_req *)CMD_SP(sc);
2220                         if (io_req)
2221                                 io_req->abts_done = NULL;
2222                         if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING)
2223                                 CMD_STATE(sc) = old_ioreq_state;
2224                         spin_unlock_irqrestore(io_lock, flags);
2225                         ret = 1;
2226                         goto clean_pending_aborts_end;
2227                 } else {
2228                         spin_lock_irqsave(io_lock, flags);
2229                         if (CMD_FLAGS(sc) & FNIC_DEVICE_RESET)
2230                                 CMD_FLAGS(sc) |= FNIC_DEV_RST_TERM_ISSUED;
2231                         spin_unlock_irqrestore(io_lock, flags);
2232                 }
2233                 CMD_FLAGS(sc) |= FNIC_IO_INTERNAL_TERM_ISSUED;
2234
2235                 wait_for_completion_timeout(&tm_done,
2236                                             msecs_to_jiffies
2237                                             (fnic->config.ed_tov));
2238
2239                 /* Recheck cmd state to check if it is now aborted */
2240                 spin_lock_irqsave(io_lock, flags);
2241                 io_req = (struct fnic_io_req *)CMD_SP(sc);
2242                 if (!io_req) {
2243                         spin_unlock_irqrestore(io_lock, flags);
2244                         CMD_FLAGS(sc) |= FNIC_IO_ABT_TERM_REQ_NULL;
2245                         continue;
2246                 }
2247
2248                 io_req->abts_done = NULL;
2249
2250                 /* if abort is still pending with fw, fail */
2251                 if (CMD_ABTS_STATUS(sc) == FCPIO_INVALID_CODE) {
2252                         spin_unlock_irqrestore(io_lock, flags);
2253                         CMD_FLAGS(sc) |= FNIC_IO_ABT_TERM_DONE;
2254                         ret = 1;
2255                         goto clean_pending_aborts_end;
2256                 }
2257                 CMD_STATE(sc) = FNIC_IOREQ_ABTS_COMPLETE;
2258
2259                 /* original sc used for lr is handled by dev reset code */
2260                 if (sc != lr_sc)
2261                         CMD_SP(sc) = NULL;
2262                 spin_unlock_irqrestore(io_lock, flags);
2263
2264                 /* original sc used for lr is handled by dev reset code */
2265                 if (sc != lr_sc) {
2266                         fnic_release_ioreq_buf(fnic, io_req, sc);
2267                         mempool_free(io_req, fnic->io_req_pool);
2268                 }
2269
2270                 /*
2271                  * Any IO is returned during reset, it needs to call scsi_done
2272                  * to return the scsi_cmnd to upper layer.
2273                  */
2274                 if (sc->scsi_done) {
2275                         /* Set result to let upper SCSI layer retry */
2276                         sc->result = DID_RESET << 16;
2277                         sc->scsi_done(sc);
2278                 }
2279         }
2280
2281         schedule_timeout(msecs_to_jiffies(2 * fnic->config.ed_tov));
2282
2283         /* walk again to check, if IOs are still pending in fw */
2284         if (fnic_is_abts_pending(fnic, lr_sc))
2285                 ret = FAILED;
2286
2287 clean_pending_aborts_end:
2288         return ret;
2289 }
2290
2291 /**
2292  * fnic_scsi_host_start_tag
2293  * Allocates tagid from host's tag list
2294  **/
2295 static inline int
2296 fnic_scsi_host_start_tag(struct fnic *fnic, struct scsi_cmnd *sc)
2297 {
2298         struct request_queue *q = sc->request->q;
2299         struct request *dummy;
2300
2301         dummy = blk_mq_alloc_request(q, REQ_OP_WRITE, BLK_MQ_REQ_NOWAIT);
2302         if (IS_ERR(dummy))
2303                 return SCSI_NO_TAG;
2304
2305         sc->tag = sc->request->tag = dummy->tag;
2306         sc->host_scribble = (unsigned char *)dummy;
2307
2308         return dummy->tag;
2309 }
2310
2311 /**
2312  * fnic_scsi_host_end_tag
2313  * frees tag allocated by fnic_scsi_host_start_tag.
2314  **/
2315 static inline void
2316 fnic_scsi_host_end_tag(struct fnic *fnic, struct scsi_cmnd *sc)
2317 {
2318         struct request *dummy = (struct request *)sc->host_scribble;
2319
2320         blk_mq_free_request(dummy);
2321 }
2322
2323 /*
2324  * SCSI Eh thread issues a Lun Reset when one or more commands on a LUN
2325  * fail to get aborted. It calls driver's eh_device_reset with a SCSI command
2326  * on the LUN.
2327  */
2328 int fnic_device_reset(struct scsi_cmnd *sc)
2329 {
2330         struct fc_lport *lp;
2331         struct fnic *fnic;
2332         struct fnic_io_req *io_req = NULL;
2333         struct fc_rport *rport;
2334         int status;
2335         int ret = FAILED;
2336         spinlock_t *io_lock;
2337         unsigned long flags;
2338         unsigned long start_time = 0;
2339         struct scsi_lun fc_lun;
2340         struct fnic_stats *fnic_stats;
2341         struct reset_stats *reset_stats;
2342         int tag = 0;
2343         DECLARE_COMPLETION_ONSTACK(tm_done);
2344         int tag_gen_flag = 0;   /*to track tags allocated by fnic driver*/
2345         bool new_sc = 0;
2346
2347         /* Wait for rport to unblock */
2348         fc_block_scsi_eh(sc);
2349
2350         /* Get local-port, check ready and link up */
2351         lp = shost_priv(sc->device->host);
2352
2353         fnic = lport_priv(lp);
2354         fnic_stats = &fnic->fnic_stats;
2355         reset_stats = &fnic->fnic_stats.reset_stats;
2356
2357         atomic64_inc(&reset_stats->device_resets);
2358
2359         rport = starget_to_rport(scsi_target(sc->device));
2360         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2361                       "Device reset called FCID 0x%x, LUN 0x%llx sc 0x%p\n",
2362                       rport->port_id, sc->device->lun, sc);
2363
2364         if (lp->state != LPORT_ST_READY || !(lp->link_up))
2365                 goto fnic_device_reset_end;
2366
2367         /* Check if remote port up */
2368         if (fc_remote_port_chkready(rport)) {
2369                 atomic64_inc(&fnic_stats->misc_stats.rport_not_ready);
2370                 goto fnic_device_reset_end;
2371         }
2372
2373         CMD_FLAGS(sc) = FNIC_DEVICE_RESET;
2374         /* Allocate tag if not present */
2375
2376         tag = sc->request->tag;
2377         if (unlikely(tag < 0)) {
2378                 /*
2379                  * Really should fix the midlayer to pass in a proper
2380                  * request for ioctls...
2381                  */
2382                 tag = fnic_scsi_host_start_tag(fnic, sc);
2383                 if (unlikely(tag == SCSI_NO_TAG))
2384                         goto fnic_device_reset_end;
2385                 tag_gen_flag = 1;
2386                 new_sc = 1;
2387         }
2388         io_lock = fnic_io_lock_hash(fnic, sc);
2389         spin_lock_irqsave(io_lock, flags);
2390         io_req = (struct fnic_io_req *)CMD_SP(sc);
2391
2392         /*
2393          * If there is a io_req attached to this command, then use it,
2394          * else allocate a new one.
2395          */
2396         if (!io_req) {
2397                 io_req = mempool_alloc(fnic->io_req_pool, GFP_ATOMIC);
2398                 if (!io_req) {
2399                         spin_unlock_irqrestore(io_lock, flags);
2400                         goto fnic_device_reset_end;
2401                 }
2402                 memset(io_req, 0, sizeof(*io_req));
2403                 io_req->port_id = rport->port_id;
2404                 CMD_SP(sc) = (char *)io_req;
2405         }
2406         io_req->dr_done = &tm_done;
2407         CMD_STATE(sc) = FNIC_IOREQ_CMD_PENDING;
2408         CMD_LR_STATUS(sc) = FCPIO_INVALID_CODE;
2409         spin_unlock_irqrestore(io_lock, flags);
2410
2411         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host, "TAG %x\n", tag);
2412
2413         /*
2414          * issue the device reset, if enqueue failed, clean up the ioreq
2415          * and break assoc with scsi cmd
2416          */
2417         if (fnic_queue_dr_io_req(fnic, sc, io_req)) {
2418                 spin_lock_irqsave(io_lock, flags);
2419                 io_req = (struct fnic_io_req *)CMD_SP(sc);
2420                 if (io_req)
2421                         io_req->dr_done = NULL;
2422                 goto fnic_device_reset_clean;
2423         }
2424         spin_lock_irqsave(io_lock, flags);
2425         CMD_FLAGS(sc) |= FNIC_DEV_RST_ISSUED;
2426         spin_unlock_irqrestore(io_lock, flags);
2427
2428         /*
2429          * Wait on the local completion for LUN reset.  The io_req may be
2430          * freed while we wait since we hold no lock.
2431          */
2432         wait_for_completion_timeout(&tm_done,
2433                                     msecs_to_jiffies(FNIC_LUN_RESET_TIMEOUT));
2434
2435         spin_lock_irqsave(io_lock, flags);
2436         io_req = (struct fnic_io_req *)CMD_SP(sc);
2437         if (!io_req) {
2438                 spin_unlock_irqrestore(io_lock, flags);
2439                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2440                                 "io_req is null tag 0x%x sc 0x%p\n", tag, sc);
2441                 goto fnic_device_reset_end;
2442         }
2443         io_req->dr_done = NULL;
2444
2445         status = CMD_LR_STATUS(sc);
2446
2447         /*
2448          * If lun reset not completed, bail out with failed. io_req
2449          * gets cleaned up during higher levels of EH
2450          */
2451         if (status == FCPIO_INVALID_CODE) {
2452                 atomic64_inc(&reset_stats->device_reset_timeouts);
2453                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2454                               "Device reset timed out\n");
2455                 CMD_FLAGS(sc) |= FNIC_DEV_RST_TIMED_OUT;
2456                 spin_unlock_irqrestore(io_lock, flags);
2457                 int_to_scsilun(sc->device->lun, &fc_lun);
2458                 /*
2459                  * Issue abort and terminate on device reset request.
2460                  * If q'ing of terminate fails, retry it after a delay.
2461                  */
2462                 while (1) {
2463                         spin_lock_irqsave(io_lock, flags);
2464                         if (CMD_FLAGS(sc) & FNIC_DEV_RST_TERM_ISSUED) {
2465                                 spin_unlock_irqrestore(io_lock, flags);
2466                                 break;
2467                         }
2468                         spin_unlock_irqrestore(io_lock, flags);
2469                         if (fnic_queue_abort_io_req(fnic,
2470                                 tag | FNIC_TAG_DEV_RST,
2471                                 FCPIO_ITMF_ABT_TASK_TERM,
2472                                 fc_lun.scsi_lun, io_req)) {
2473                                 wait_for_completion_timeout(&tm_done,
2474                                 msecs_to_jiffies(FNIC_ABT_TERM_DELAY_TIMEOUT));
2475                         } else {
2476                                 spin_lock_irqsave(io_lock, flags);
2477                                 CMD_FLAGS(sc) |= FNIC_DEV_RST_TERM_ISSUED;
2478                                 CMD_STATE(sc) = FNIC_IOREQ_ABTS_PENDING;
2479                                 io_req->abts_done = &tm_done;
2480                                 spin_unlock_irqrestore(io_lock, flags);
2481                                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2482                                 "Abort and terminate issued on Device reset "
2483                                 "tag 0x%x sc 0x%p\n", tag, sc);
2484                                 break;
2485                         }
2486                 }
2487                 while (1) {
2488                         spin_lock_irqsave(io_lock, flags);
2489                         if (!(CMD_FLAGS(sc) & FNIC_DEV_RST_DONE)) {
2490                                 spin_unlock_irqrestore(io_lock, flags);
2491                                 wait_for_completion_timeout(&tm_done,
2492                                 msecs_to_jiffies(FNIC_LUN_RESET_TIMEOUT));
2493                                 break;
2494                         } else {
2495                                 io_req = (struct fnic_io_req *)CMD_SP(sc);
2496                                 io_req->abts_done = NULL;
2497                                 goto fnic_device_reset_clean;
2498                         }
2499                 }
2500         } else {
2501                 spin_unlock_irqrestore(io_lock, flags);
2502         }
2503
2504         /* Completed, but not successful, clean up the io_req, return fail */
2505         if (status != FCPIO_SUCCESS) {
2506                 spin_lock_irqsave(io_lock, flags);
2507                 FNIC_SCSI_DBG(KERN_DEBUG,
2508                               fnic->lport->host,
2509                               "Device reset completed - failed\n");
2510                 io_req = (struct fnic_io_req *)CMD_SP(sc);
2511                 goto fnic_device_reset_clean;
2512         }
2513
2514         /*
2515          * Clean up any aborts on this lun that have still not
2516          * completed. If any of these fail, then LUN reset fails.
2517          * clean_pending_aborts cleans all cmds on this lun except
2518          * the lun reset cmd. If all cmds get cleaned, the lun reset
2519          * succeeds
2520          */
2521         if (fnic_clean_pending_aborts(fnic, sc, new_sc)) {
2522                 spin_lock_irqsave(io_lock, flags);
2523                 io_req = (struct fnic_io_req *)CMD_SP(sc);
2524                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2525                               "Device reset failed"
2526                               " since could not abort all IOs\n");
2527                 goto fnic_device_reset_clean;
2528         }
2529
2530         /* Clean lun reset command */
2531         spin_lock_irqsave(io_lock, flags);
2532         io_req = (struct fnic_io_req *)CMD_SP(sc);
2533         if (io_req)
2534                 /* Completed, and successful */
2535                 ret = SUCCESS;
2536
2537 fnic_device_reset_clean:
2538         if (io_req)
2539                 CMD_SP(sc) = NULL;
2540
2541         spin_unlock_irqrestore(io_lock, flags);
2542
2543         if (io_req) {
2544                 start_time = io_req->start_time;
2545                 fnic_release_ioreq_buf(fnic, io_req, sc);
2546                 mempool_free(io_req, fnic->io_req_pool);
2547         }
2548
2549 fnic_device_reset_end:
2550         FNIC_TRACE(fnic_device_reset, sc->device->host->host_no,
2551                   sc->request->tag, sc,
2552                   jiffies_to_msecs(jiffies - start_time),
2553                   0, ((u64)sc->cmnd[0] << 32 |
2554                   (u64)sc->cmnd[2] << 24 | (u64)sc->cmnd[3] << 16 |
2555                   (u64)sc->cmnd[4] << 8 | sc->cmnd[5]),
2556                   (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc)));
2557
2558         /* free tag if it is allocated */
2559         if (unlikely(tag_gen_flag))
2560                 fnic_scsi_host_end_tag(fnic, sc);
2561
2562         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2563                       "Returning from device reset %s\n",
2564                       (ret == SUCCESS) ?
2565                       "SUCCESS" : "FAILED");
2566
2567         if (ret == FAILED)
2568                 atomic64_inc(&reset_stats->device_reset_failures);
2569
2570         return ret;
2571 }
2572
2573 /* Clean up all IOs, clean up libFC local port */
2574 int fnic_reset(struct Scsi_Host *shost)
2575 {
2576         struct fc_lport *lp;
2577         struct fnic *fnic;
2578         int ret = 0;
2579         struct reset_stats *reset_stats;
2580
2581         lp = shost_priv(shost);
2582         fnic = lport_priv(lp);
2583         reset_stats = &fnic->fnic_stats.reset_stats;
2584
2585         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2586                       "fnic_reset called\n");
2587
2588         atomic64_inc(&reset_stats->fnic_resets);
2589
2590         /*
2591          * Reset local port, this will clean up libFC exchanges,
2592          * reset remote port sessions, and if link is up, begin flogi
2593          */
2594         ret = fc_lport_reset(lp);
2595
2596         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2597                       "Returning from fnic reset %s\n",
2598                       (ret == 0) ?
2599                       "SUCCESS" : "FAILED");
2600
2601         if (ret == 0)
2602                 atomic64_inc(&reset_stats->fnic_reset_completions);
2603         else
2604                 atomic64_inc(&reset_stats->fnic_reset_failures);
2605
2606         return ret;
2607 }
2608
2609 /*
2610  * SCSI Error handling calls driver's eh_host_reset if all prior
2611  * error handling levels return FAILED. If host reset completes
2612  * successfully, and if link is up, then Fabric login begins.
2613  *
2614  * Host Reset is the highest level of error recovery. If this fails, then
2615  * host is offlined by SCSI.
2616  *
2617  */
2618 int fnic_host_reset(struct scsi_cmnd *sc)
2619 {
2620         int ret;
2621         unsigned long wait_host_tmo;
2622         struct Scsi_Host *shost = sc->device->host;
2623         struct fc_lport *lp = shost_priv(shost);
2624         struct fnic *fnic = lport_priv(lp);
2625         unsigned long flags;
2626
2627         spin_lock_irqsave(&fnic->fnic_lock, flags);
2628         if (!fnic->internal_reset_inprogress) {
2629                 fnic->internal_reset_inprogress = true;
2630         } else {
2631                 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2632                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2633                         "host reset in progress skipping another host reset\n");
2634                 return SUCCESS;
2635         }
2636         spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2637
2638         /*
2639          * If fnic_reset is successful, wait for fabric login to complete
2640          * scsi-ml tries to send a TUR to every device if host reset is
2641          * successful, so before returning to scsi, fabric should be up
2642          */
2643         ret = (fnic_reset(shost) == 0) ? SUCCESS : FAILED;
2644         if (ret == SUCCESS) {
2645                 wait_host_tmo = jiffies + FNIC_HOST_RESET_SETTLE_TIME * HZ;
2646                 ret = FAILED;
2647                 while (time_before(jiffies, wait_host_tmo)) {
2648                         if ((lp->state == LPORT_ST_READY) &&
2649                             (lp->link_up)) {
2650                                 ret = SUCCESS;
2651                                 break;
2652                         }
2653                         ssleep(1);
2654                 }
2655         }
2656
2657         spin_lock_irqsave(&fnic->fnic_lock, flags);
2658         fnic->internal_reset_inprogress = false;
2659         spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2660         return ret;
2661 }
2662
2663 /*
2664  * This fxn is called from libFC when host is removed
2665  */
2666 void fnic_scsi_abort_io(struct fc_lport *lp)
2667 {
2668         int err = 0;
2669         unsigned long flags;
2670         enum fnic_state old_state;
2671         struct fnic *fnic = lport_priv(lp);
2672         DECLARE_COMPLETION_ONSTACK(remove_wait);
2673
2674         /* Issue firmware reset for fnic, wait for reset to complete */
2675 retry_fw_reset:
2676         spin_lock_irqsave(&fnic->fnic_lock, flags);
2677         if (unlikely(fnic->state == FNIC_IN_FC_TRANS_ETH_MODE)) {
2678                 /* fw reset is in progress, poll for its completion */
2679                 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2680                 schedule_timeout(msecs_to_jiffies(100));
2681                 goto retry_fw_reset;
2682         }
2683
2684         fnic->remove_wait = &remove_wait;
2685         old_state = fnic->state;
2686         fnic->state = FNIC_IN_FC_TRANS_ETH_MODE;
2687         fnic_update_mac_locked(fnic, fnic->ctlr.ctl_src_addr);
2688         spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2689
2690         err = fnic_fw_reset_handler(fnic);
2691         if (err) {
2692                 spin_lock_irqsave(&fnic->fnic_lock, flags);
2693                 if (fnic->state == FNIC_IN_FC_TRANS_ETH_MODE)
2694                         fnic->state = old_state;
2695                 fnic->remove_wait = NULL;
2696                 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2697                 return;
2698         }
2699
2700         /* Wait for firmware reset to complete */
2701         wait_for_completion_timeout(&remove_wait,
2702                                     msecs_to_jiffies(FNIC_RMDEVICE_TIMEOUT));
2703
2704         spin_lock_irqsave(&fnic->fnic_lock, flags);
2705         fnic->remove_wait = NULL;
2706         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2707                       "fnic_scsi_abort_io %s\n",
2708                       (fnic->state == FNIC_IN_ETH_MODE) ?
2709                       "SUCCESS" : "FAILED");
2710         spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2711
2712 }
2713
2714 /*
2715  * This fxn called from libFC to clean up driver IO state on link down
2716  */
2717 void fnic_scsi_cleanup(struct fc_lport *lp)
2718 {
2719         unsigned long flags;
2720         enum fnic_state old_state;
2721         struct fnic *fnic = lport_priv(lp);
2722
2723         /* issue fw reset */
2724 retry_fw_reset:
2725         spin_lock_irqsave(&fnic->fnic_lock, flags);
2726         if (unlikely(fnic->state == FNIC_IN_FC_TRANS_ETH_MODE)) {
2727                 /* fw reset is in progress, poll for its completion */
2728                 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2729                 schedule_timeout(msecs_to_jiffies(100));
2730                 goto retry_fw_reset;
2731         }
2732         old_state = fnic->state;
2733         fnic->state = FNIC_IN_FC_TRANS_ETH_MODE;
2734         fnic_update_mac_locked(fnic, fnic->ctlr.ctl_src_addr);
2735         spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2736
2737         if (fnic_fw_reset_handler(fnic)) {
2738                 spin_lock_irqsave(&fnic->fnic_lock, flags);
2739                 if (fnic->state == FNIC_IN_FC_TRANS_ETH_MODE)
2740                         fnic->state = old_state;
2741                 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2742         }
2743
2744 }
2745
2746 void fnic_empty_scsi_cleanup(struct fc_lport *lp)
2747 {
2748 }
2749
2750 void fnic_exch_mgr_reset(struct fc_lport *lp, u32 sid, u32 did)
2751 {
2752         struct fnic *fnic = lport_priv(lp);
2753
2754         /* Non-zero sid, nothing to do */
2755         if (sid)
2756                 goto call_fc_exch_mgr_reset;
2757
2758         if (did) {
2759                 fnic_rport_exch_reset(fnic, did);
2760                 goto call_fc_exch_mgr_reset;
2761         }
2762
2763         /*
2764          * sid = 0, did = 0
2765          * link down or device being removed
2766          */
2767         if (!fnic->in_remove)
2768                 fnic_scsi_cleanup(lp);
2769         else
2770                 fnic_scsi_abort_io(lp);
2771
2772         /* call libFC exch mgr reset to reset its exchanges */
2773 call_fc_exch_mgr_reset:
2774         fc_exch_mgr_reset(lp, sid, did);
2775
2776 }
2777
2778 /*
2779  * fnic_is_abts_pending() is a helper function that
2780  * walks through tag map to check if there is any IOs pending,if there is one,
2781  * then it returns 1 (true), otherwise 0 (false)
2782  * if @lr_sc is non NULL, then it checks IOs specific to particular LUN,
2783  * otherwise, it checks for all IOs.
2784  */
2785 int fnic_is_abts_pending(struct fnic *fnic, struct scsi_cmnd *lr_sc)
2786 {
2787         int tag;
2788         struct fnic_io_req *io_req;
2789         spinlock_t *io_lock;
2790         unsigned long flags;
2791         int ret = 0;
2792         struct scsi_cmnd *sc;
2793         struct scsi_device *lun_dev = NULL;
2794
2795         if (lr_sc)
2796                 lun_dev = lr_sc->device;
2797
2798         /* walk again to check, if IOs are still pending in fw */
2799         for (tag = 0; tag < fnic->fnic_max_tag_id; tag++) {
2800                 sc = scsi_host_find_tag(fnic->lport->host, tag);
2801                 /*
2802                  * ignore this lun reset cmd or cmds that do not belong to
2803                  * this lun
2804                  */
2805                 if (!sc || (lr_sc && (sc->device != lun_dev || sc == lr_sc)))
2806                         continue;
2807
2808                 io_lock = fnic_io_lock_hash(fnic, sc);
2809                 spin_lock_irqsave(io_lock, flags);
2810
2811                 io_req = (struct fnic_io_req *)CMD_SP(sc);
2812
2813                 if (!io_req || sc->device != lun_dev) {
2814                         spin_unlock_irqrestore(io_lock, flags);
2815                         continue;
2816                 }
2817
2818                 /*
2819                  * Found IO that is still pending with firmware and
2820                  * belongs to the LUN that we are resetting
2821                  */
2822                 FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host,
2823                               "Found IO in %s on lun\n",
2824                               fnic_ioreq_state_to_str(CMD_STATE(sc)));
2825
2826                 if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING)
2827                         ret = 1;
2828                 spin_unlock_irqrestore(io_lock, flags);
2829         }
2830
2831         return ret;
2832 }