drivers/scsi/lpfc/lpfc_scsi.c

   1 /*******************************************************************
   2  * This file is part of the Emulex Linux Device Driver for         *
   3  * Fibre Channel Host Bus Adapters.                                *
   4  * Copyright (C) 2004-2006 Emulex.  All rights reserved.           *
   5  * EMULEX and SLI are trademarks of Emulex.                        *
   6  * www.emulex.com                                                  *
   7  * Portions Copyright (C) 2004-2005 Christoph Hellwig              *
   8  *                                                                 *
   9  * This program is free software; you can redistribute it and/or   *
  10  * modify it under the terms of version 2 of the GNU General       *
  11  * Public License as published by the Free Software Foundation.    *
  12  * This program is distributed in the hope that it will be useful. *
  13  * ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND          *
  14  * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,  *
  15  * FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT, ARE      *
  16  * DISCLAIMED, EXCEPT TO THE EXTENT THAT SUCH DISCLAIMERS ARE HELD *
  17  * TO BE LEGALLY INVALID.  See the GNU General Public License for  *
  18  * more details, a copy of which can be found in the file COPYING  *
  19  * included with this package.                                     *
  20  *******************************************************************/
  21
  22 #include <linux/pci.h>
  23 #include <linux/interrupt.h>
  24 #include <linux/delay.h>
  25
  26 #include <scsi/scsi.h>
  27 #include <scsi/scsi_device.h>
  28 #include <scsi/scsi_host.h>
  29 #include <scsi/scsi_tcq.h>
  30 #include <scsi/scsi_transport_fc.h>
  31
  32 #include "lpfc_version.h"
  33 #include "lpfc_hw.h"
  34 #include "lpfc_sli.h"
  35 #include "lpfc_disc.h"
  36 #include "lpfc_scsi.h"
  37 #include "lpfc.h"
  38 #include "lpfc_logmsg.h"
  39 #include "lpfc_crtn.h"
  40
  41 #define LPFC_RESET_WAIT  2
  42 #define LPFC_ABORT_WAIT  2
  43
  44
  45 /*
  46  * This routine allocates a scsi buffer, which contains all the necessary
  47  * information needed to initiate a SCSI I/O.  The non-DMAable buffer region
  48  * contains information to build the IOCB.  The DMAable region contains
  49  * memory for the FCP CMND, FCP RSP, and the inital BPL.  In addition to
  50  * allocating memeory, the FCP CMND and FCP RSP BDEs are setup in the BPL
  51  * and the BPL BDE is setup in the IOCB.
  52  */
  53 static struct lpfc_scsi_buf *
  54 lpfc_new_scsi_buf(struct lpfc_hba * phba)
  55 {
  56         struct lpfc_scsi_buf *psb;
  57         struct ulp_bde64 *bpl;
  58         IOCB_t *iocb;
  59         dma_addr_t pdma_phys;
  60         uint16_t iotag;
  61
  62         psb = kmalloc(sizeof(struct lpfc_scsi_buf), GFP_KERNEL);
  63         if (!psb)
  64                 return NULL;
  65         memset(psb, 0, sizeof (struct lpfc_scsi_buf));
  66         psb->scsi_hba = phba;
  67
  68         /*
  69          * Get memory from the pci pool to map the virt space to pci bus space
  70          * for an I/O.  The DMA buffer includes space for the struct fcp_cmnd,
  71          * struct fcp_rsp and the number of bde's necessary to support the
  72          * sg_tablesize.
  73          */
  74         psb->data = pci_pool_alloc(phba->lpfc_scsi_dma_buf_pool, GFP_KERNEL,
  75                                                         &psb->dma_handle);
  76         if (!psb->data) {
  77                 kfree(psb);
  78                 return NULL;
  79         }
  80
  81         /* Initialize virtual ptrs to dma_buf region. */
  82         memset(psb->data, 0, phba->cfg_sg_dma_buf_size);
  83
  84         /* Allocate iotag for psb->cur_iocbq. */
  85         iotag = lpfc_sli_next_iotag(phba, &psb->cur_iocbq);
  86         if (iotag == 0) {
  87                 pci_pool_free(phba->lpfc_scsi_dma_buf_pool,
  88                               psb->data, psb->dma_handle);
  89                 kfree (psb);
  90                 return NULL;
  91         }
  92         psb->cur_iocbq.iocb_flag |= LPFC_IO_FCP;
  93
  94         psb->fcp_cmnd = psb->data;
  95         psb->fcp_rsp = psb->data + sizeof(struct fcp_cmnd);
  96         psb->fcp_bpl = psb->data + sizeof(struct fcp_cmnd) +
  97                                                         sizeof(struct fcp_rsp);
  98
  99         /* Initialize local short-hand pointers. */
 100         bpl = psb->fcp_bpl;
 101         pdma_phys = psb->dma_handle;
 102
 103         /*
 104          * The first two bdes are the FCP_CMD and FCP_RSP.  The balance are sg
 105          * list bdes.  Initialize the first two and leave the rest for
 106          * queuecommand.
 107          */
 108         bpl->addrHigh = le32_to_cpu(putPaddrHigh(pdma_phys));
 109         bpl->addrLow = le32_to_cpu(putPaddrLow(pdma_phys));
 110         bpl->tus.f.bdeSize = sizeof (struct fcp_cmnd);
 111         bpl->tus.f.bdeFlags = BUFF_USE_CMND;
 112         bpl->tus.w = le32_to_cpu(bpl->tus.w);
 113         bpl++;
 114
 115         /* Setup the physical region for the FCP RSP */
 116         pdma_phys += sizeof (struct fcp_cmnd);
 117         bpl->addrHigh = le32_to_cpu(putPaddrHigh(pdma_phys));
 118         bpl->addrLow = le32_to_cpu(putPaddrLow(pdma_phys));
 119         bpl->tus.f.bdeSize = sizeof (struct fcp_rsp);
 120         bpl->tus.f.bdeFlags = (BUFF_USE_CMND | BUFF_USE_RCV);
 121         bpl->tus.w = le32_to_cpu(bpl->tus.w);
 122
 123         /*
 124          * Since the IOCB for the FCP I/O is built into this lpfc_scsi_buf,
 125          * initialize it with all known data now.
 126          */
 127         pdma_phys += (sizeof (struct fcp_rsp));
 128         iocb = &psb->cur_iocbq.iocb;
 129         iocb->un.fcpi64.bdl.ulpIoTag32 = 0;
 130         iocb->un.fcpi64.bdl.addrHigh = putPaddrHigh(pdma_phys);
 131         iocb->un.fcpi64.bdl.addrLow = putPaddrLow(pdma_phys);
 132         iocb->un.fcpi64.bdl.bdeSize = (2 * sizeof (struct ulp_bde64));
 133         iocb->un.fcpi64.bdl.bdeFlags = BUFF_TYPE_BDL;
 134         iocb->ulpBdeCount = 1;
 135         iocb->ulpClass = CLASS3;
 136
 137         return psb;
 138 }
 139
 140 static struct lpfc_scsi_buf*
 141 lpfc_get_scsi_buf(struct lpfc_hba * phba)
 142 {
 143         struct  lpfc_scsi_buf * lpfc_cmd = NULL;
 144         struct list_head *scsi_buf_list = &phba->lpfc_scsi_buf_list;
 145         unsigned long iflag = 0;
 146
 147         spin_lock_irqsave(&phba->scsi_buf_list_lock, iflag);
 148         list_remove_head(scsi_buf_list, lpfc_cmd, struct lpfc_scsi_buf, list);
 149         spin_unlock_irqrestore(&phba->scsi_buf_list_lock, iflag);
 150         return  lpfc_cmd;
 151 }
 152
 153 static void
 154 lpfc_release_scsi_buf(struct lpfc_hba * phba, struct lpfc_scsi_buf * psb)
 155 {
 156         unsigned long iflag = 0;
 157
 158         spin_lock_irqsave(&phba->scsi_buf_list_lock, iflag);
 159         psb->pCmd = NULL;
 160         list_add_tail(&psb->list, &phba->lpfc_scsi_buf_list);
 161         spin_unlock_irqrestore(&phba->scsi_buf_list_lock, iflag);
 162 }
 163
 164 static int
 165 lpfc_scsi_prep_dma_buf(struct lpfc_hba * phba, struct lpfc_scsi_buf * lpfc_cmd)
 166 {
 167         struct scsi_cmnd *scsi_cmnd = lpfc_cmd->pCmd;
 168         struct scatterlist *sgel = NULL;
 169         struct fcp_cmnd *fcp_cmnd = lpfc_cmd->fcp_cmnd;
 170         struct ulp_bde64 *bpl = lpfc_cmd->fcp_bpl;
 171         IOCB_t *iocb_cmd = &lpfc_cmd->cur_iocbq.iocb;
 172         dma_addr_t physaddr;
 173         uint32_t i, num_bde = 0;
 174         int datadir = scsi_cmnd->sc_data_direction;
 175         int dma_error;
 176
 177         /*
 178          * There are three possibilities here - use scatter-gather segment, use
 179          * the single mapping, or neither.  Start the lpfc command prep by
 180          * bumping the bpl beyond the fcp_cmnd and fcp_rsp regions to the first
 181          * data bde entry.
 182          */
 183         bpl += 2;
 184         if (scsi_cmnd->use_sg) {
 185                 /*
 186                  * The driver stores the segment count returned from pci_map_sg
 187                  * because this a count of dma-mappings used to map the use_sg
 188                  * pages.  They are not guaranteed to be the same for those
 189                  * architectures that implement an IOMMU.
 190                  */
 191                 sgel = (struct scatterlist *)scsi_cmnd->request_buffer;
 192                 lpfc_cmd->seg_cnt = dma_map_sg(&phba->pcidev->dev, sgel,
 193                                                 scsi_cmnd->use_sg, datadir);
 194                 if (lpfc_cmd->seg_cnt == 0)
 195                         return 1;
 196
 197                 if (lpfc_cmd->seg_cnt > phba->cfg_sg_seg_cnt) {
 198                         printk(KERN_ERR "%s: Too many sg segments from "
 199                                "dma_map_sg.  Config %d, seg_cnt %d",
 200                                __FUNCTION__, phba->cfg_sg_seg_cnt,
 201                                lpfc_cmd->seg_cnt);
 202                         dma_unmap_sg(&phba->pcidev->dev, sgel,
 203                                      lpfc_cmd->seg_cnt, datadir);
 204                         return 1;
 205                 }
 206
 207                 /*
 208                  * The driver established a maximum scatter-gather segment count
 209                  * during probe that limits the number of sg elements in any
 210                  * single scsi command.  Just run through the seg_cnt and format
 211                  * the bde's.
 212                  */
 213                 for (i = 0; i < lpfc_cmd->seg_cnt; i++) {
 214                         physaddr = sg_dma_address(sgel);
 215                         bpl->addrLow = le32_to_cpu(putPaddrLow(physaddr));
 216                         bpl->addrHigh = le32_to_cpu(putPaddrHigh(physaddr));
 217                         bpl->tus.f.bdeSize = sg_dma_len(sgel);
 218                         if (datadir == DMA_TO_DEVICE)
 219                                 bpl->tus.f.bdeFlags = 0;
 220                         else
 221                                 bpl->tus.f.bdeFlags = BUFF_USE_RCV;
 222                         bpl->tus.w = le32_to_cpu(bpl->tus.w);
 223                         bpl++;
 224                         sgel++;
 225                         num_bde++;
 226                 }
 227         } else if (scsi_cmnd->request_buffer && scsi_cmnd->request_bufflen) {
 228                 physaddr = dma_map_single(&phba->pcidev->dev,
 229                                           scsi_cmnd->request_buffer,
 230                                           scsi_cmnd->request_bufflen,
 231                                           datadir);
 232                 dma_error = dma_mapping_error(physaddr);
 233                 if (dma_error) {
 234                         lpfc_printf_log(phba, KERN_ERR, LOG_FCP,
 235                                 "%d:0718 Unable to dma_map_single "
 236                                 "request_buffer: x%x\n",
 237                                 phba->brd_no, dma_error);
 238                         return 1;
 239                 }
 240
 241                 lpfc_cmd->nonsg_phys = physaddr;
 242                 bpl->addrLow = le32_to_cpu(putPaddrLow(physaddr));
 243                 bpl->addrHigh = le32_to_cpu(putPaddrHigh(physaddr));
 244                 bpl->tus.f.bdeSize = scsi_cmnd->request_bufflen;
 245                 if (datadir == DMA_TO_DEVICE)
 246                         bpl->tus.f.bdeFlags = 0;
 247                 else
 248                         bpl->tus.f.bdeFlags = BUFF_USE_RCV;
 249                 bpl->tus.w = le32_to_cpu(bpl->tus.w);
 250                 num_bde = 1;
 251                 bpl++;
 252         }
 253
 254         /*
 255          * Finish initializing those IOCB fields that are dependent on the
 256          * scsi_cmnd request_buffer.  Note that the bdeSize is explicitly
 257          * reinitialized since all iocb memory resources are used many times
 258          * for transmit, receive, and continuation bpl's.
 259          */
 260         iocb_cmd->un.fcpi64.bdl.bdeSize = (2 * sizeof (struct ulp_bde64));
 261         iocb_cmd->un.fcpi64.bdl.bdeSize +=
 262                 (num_bde * sizeof (struct ulp_bde64));
 263         iocb_cmd->ulpBdeCount = 1;
 264         iocb_cmd->ulpLe = 1;
 265         fcp_cmnd->fcpDl = be32_to_cpu(scsi_cmnd->request_bufflen);
 266         return 0;
 267 }
 268
 269 static void
 270 lpfc_scsi_unprep_dma_buf(struct lpfc_hba * phba, struct lpfc_scsi_buf * psb)
 271 {
 272         /*
 273          * There are only two special cases to consider.  (1) the scsi command
 274          * requested scatter-gather usage or (2) the scsi command allocated
 275          * a request buffer, but did not request use_sg.  There is a third
 276          * case, but it does not require resource deallocation.
 277          */
 278         if ((psb->seg_cnt > 0) && (psb->pCmd->use_sg)) {
 279                 dma_unmap_sg(&phba->pcidev->dev, psb->pCmd->request_buffer,
 280                                 psb->seg_cnt, psb->pCmd->sc_data_direction);
 281         } else {
 282                  if ((psb->nonsg_phys) && (psb->pCmd->request_bufflen)) {
 283                         dma_unmap_single(&phba->pcidev->dev, psb->nonsg_phys,
 284                                                 psb->pCmd->request_bufflen,
 285                                                 psb->pCmd->sc_data_direction);
 286                  }
 287         }
 288 }
 289
 290 static void
 291 lpfc_handle_fcp_err(struct lpfc_scsi_buf *lpfc_cmd)
 292 {
 293         struct scsi_cmnd *cmnd = lpfc_cmd->pCmd;
 294         struct fcp_cmnd *fcpcmd = lpfc_cmd->fcp_cmnd;
 295         struct fcp_rsp *fcprsp = lpfc_cmd->fcp_rsp;
 296         struct lpfc_hba *phba = lpfc_cmd->scsi_hba;
 297         uint32_t fcpi_parm = lpfc_cmd->cur_iocbq.iocb.un.fcpi.fcpi_parm;
 298         uint32_t resp_info = fcprsp->rspStatus2;
 299         uint32_t scsi_status = fcprsp->rspStatus3;
 300         uint32_t host_status = DID_OK;
 301         uint32_t rsplen = 0;
 302
 303         /*
 304          *  If this is a task management command, there is no
 305          *  scsi packet associated with this lpfc_cmd.  The driver
 306          *  consumes it.
 307          */
 308         if (fcpcmd->fcpCntl2) {
 309                 scsi_status = 0;
 310                 goto out;
 311         }
 312
 313         lpfc_printf_log(phba, KERN_WARNING, LOG_FCP,
 314                         "%d:0730 FCP command failed: RSP "
 315                         "Data: x%x x%x x%x x%x x%x x%x\n",
 316                         phba->brd_no, resp_info, scsi_status,
 317                         be32_to_cpu(fcprsp->rspResId),
 318                         be32_to_cpu(fcprsp->rspSnsLen),
 319                         be32_to_cpu(fcprsp->rspRspLen),
 320                         fcprsp->rspInfo3);
 321
 322         if (resp_info & RSP_LEN_VALID) {
 323                 rsplen = be32_to_cpu(fcprsp->rspRspLen);
 324                 if ((rsplen != 0 && rsplen != 4 && rsplen != 8) ||
 325                     (fcprsp->rspInfo3 != RSP_NO_FAILURE)) {
 326                         host_status = DID_ERROR;
 327                         goto out;
 328                 }
 329         }
 330
 331         if ((resp_info & SNS_LEN_VALID) && fcprsp->rspSnsLen) {
 332                 uint32_t snslen = be32_to_cpu(fcprsp->rspSnsLen);
 333                 if (snslen > SCSI_SENSE_BUFFERSIZE)
 334                         snslen = SCSI_SENSE_BUFFERSIZE;
 335
 336                 memcpy(cmnd->sense_buffer, &fcprsp->rspInfo0 + rsplen, snslen);
 337         }
 338
 339         cmnd->resid = 0;
 340         if (resp_info & RESID_UNDER) {
 341                 cmnd->resid = be32_to_cpu(fcprsp->rspResId);
 342
 343                 lpfc_printf_log(phba, KERN_INFO, LOG_FCP,
 344                                 "%d:0716 FCP Read Underrun, expected %d, "
 345                                 "residual %d Data: x%x x%x x%x\n", phba->brd_no,
 346                                 be32_to_cpu(fcpcmd->fcpDl), cmnd->resid,
 347                                 fcpi_parm, cmnd->cmnd[0], cmnd->underflow);
 348
 349                 /*
 350                  * The cmnd->underflow is the minimum number of bytes that must
 351                  * be transfered for this command.  Provided a sense condition
 352                  * is not present, make sure the actual amount transferred is at
 353                  * least the underflow value or fail.
 354                  */
 355                 if (!(resp_info & SNS_LEN_VALID) &&
 356                     (scsi_status == SAM_STAT_GOOD) &&
 357                     (cmnd->request_bufflen - cmnd->resid) < cmnd->underflow) {
 358                         lpfc_printf_log(phba, KERN_INFO, LOG_FCP,
 359                                         "%d:0717 FCP command x%x residual "
 360                                         "underrun converted to error "
 361                                         "Data: x%x x%x x%x\n", phba->brd_no,
 362                                         cmnd->cmnd[0], cmnd->request_bufflen,
 363                                         cmnd->resid, cmnd->underflow);
 364
 365                         host_status = DID_ERROR;
 366                 }
 367         } else if (resp_info & RESID_OVER) {
 368                 lpfc_printf_log(phba, KERN_WARNING, LOG_FCP,
 369                                 "%d:0720 FCP command x%x residual "
 370                                 "overrun error. Data: x%x x%x \n",
 371                                 phba->brd_no, cmnd->cmnd[0],
 372                                 cmnd->request_bufflen, cmnd->resid);
 373                 host_status = DID_ERROR;
 374
 375         /*
 376          * Check SLI validation that all the transfer was actually done
 377          * (fcpi_parm should be zero). Apply check only to reads.
 378          */
 379         } else if ((scsi_status == SAM_STAT_GOOD) && fcpi_parm &&
 380                         (cmnd->sc_data_direction == DMA_FROM_DEVICE)) {
 381                 lpfc_printf_log(phba, KERN_WARNING, LOG_FCP,
 382                         "%d:0734 FCP Read Check Error Data: "
 383                         "x%x x%x x%x x%x\n", phba->brd_no,
 384                         be32_to_cpu(fcpcmd->fcpDl),
 385                         be32_to_cpu(fcprsp->rspResId),
 386                         fcpi_parm, cmnd->cmnd[0]);
 387                 host_status = DID_ERROR;
 388                 cmnd->resid = cmnd->request_bufflen;
 389         }
 390
 391  out:
 392         cmnd->result = ScsiResult(host_status, scsi_status);
 393 }
 394
 395 static void
 396 lpfc_scsi_cmd_iocb_cmpl(struct lpfc_hba *phba, struct lpfc_iocbq *pIocbIn,
 397                         struct lpfc_iocbq *pIocbOut)
 398 {
 399         struct lpfc_scsi_buf *lpfc_cmd =
 400                 (struct lpfc_scsi_buf *) pIocbIn->context1;
 401         struct lpfc_rport_data *rdata = lpfc_cmd->rdata;
 402         struct lpfc_nodelist *pnode = rdata->pnode;
 403         struct scsi_cmnd *cmd = lpfc_cmd->pCmd;
 404         int result;
 405         struct scsi_device *sdev, *tmp_sdev;
 406         int depth = 0;
 407
 408         lpfc_cmd->result = pIocbOut->iocb.un.ulpWord[4];
 409         lpfc_cmd->status = pIocbOut->iocb.ulpStatus;
 410
 411         if (lpfc_cmd->status) {
 412                 if (lpfc_cmd->status == IOSTAT_LOCAL_REJECT &&
 413                     (lpfc_cmd->result & IOERR_DRVR_MASK))
 414                         lpfc_cmd->status = IOSTAT_DRIVER_REJECT;
 415                 else if (lpfc_cmd->status >= IOSTAT_CNT)
 416                         lpfc_cmd->status = IOSTAT_DEFAULT;
 417
 418                 lpfc_printf_log(phba, KERN_WARNING, LOG_FCP,
 419                                 "%d:0729 FCP cmd x%x failed <%d/%d> status: "
 420                                 "x%x result: x%x Data: x%x x%x\n",
 421                                 phba->brd_no, cmd->cmnd[0], cmd->device->id,
 422                                 cmd->device->lun, lpfc_cmd->status,
 423                                 lpfc_cmd->result, pIocbOut->iocb.ulpContext,
 424                                 lpfc_cmd->cur_iocbq.iocb.ulpIoTag);
 425
 426                 switch (lpfc_cmd->status) {
 427                 case IOSTAT_FCP_RSP_ERROR:
 428                         /* Call FCP RSP handler to determine result */
 429                         lpfc_handle_fcp_err(lpfc_cmd);
 430                         break;
 431                 case IOSTAT_NPORT_BSY:
 432                 case IOSTAT_FABRIC_BSY:
 433                         cmd->result = ScsiResult(DID_BUS_BUSY, 0);
 434                         break;
 435                 default:
 436                         cmd->result = ScsiResult(DID_ERROR, 0);
 437                         break;
 438                 }
 439
 440                 if ((pnode == NULL )
 441                     || (pnode->nlp_state != NLP_STE_MAPPED_NODE))
 442                         cmd->result = ScsiResult(DID_BUS_BUSY, SAM_STAT_BUSY);
 443         } else {
 444                 cmd->result = ScsiResult(DID_OK, 0);
 445         }
 446
 447         if (cmd->result || lpfc_cmd->fcp_rsp->rspSnsLen) {
 448                 uint32_t *lp = (uint32_t *)cmd->sense_buffer;
 449
 450                 lpfc_printf_log(phba, KERN_INFO, LOG_FCP,
 451                                 "%d:0710 Iodone <%d/%d> cmd %p, error x%x "
 452                                 "SNS x%x x%x Data: x%x x%x\n",
 453                                 phba->brd_no, cmd->device->id,
 454                                 cmd->device->lun, cmd, cmd->result,
 455                                 *lp, *(lp + 3), cmd->retries, cmd->resid);
 456         }
 457
 458         result = cmd->result;
 459         sdev = cmd->device;
 460         cmd->scsi_done(cmd);
 461
 462         if (phba->cfg_poll & ENABLE_FCP_RING_POLLING) {
 463                 lpfc_scsi_unprep_dma_buf(phba, lpfc_cmd);
 464                 lpfc_release_scsi_buf(phba, lpfc_cmd);
 465                 return;
 466         }
 467
 468         if (!result && pnode != NULL &&
 469            ((jiffies - pnode->last_ramp_up_time) >
 470                 LPFC_Q_RAMP_UP_INTERVAL * HZ) &&
 471            ((jiffies - pnode->last_q_full_time) >
 472                 LPFC_Q_RAMP_UP_INTERVAL * HZ) &&
 473            (phba->cfg_lun_queue_depth > sdev->queue_depth)) {
 474                 shost_for_each_device(tmp_sdev, sdev->host) {
 475                         if (phba->cfg_lun_queue_depth > tmp_sdev->queue_depth) {
 476                                 if (tmp_sdev->id != sdev->id)
 477                                         continue;
 478                                 if (tmp_sdev->ordered_tags)
 479                                         scsi_adjust_queue_depth(tmp_sdev,
 480                                                 MSG_ORDERED_TAG,
 481                                                 tmp_sdev->queue_depth+1);
 482                                 else
 483                                         scsi_adjust_queue_depth(tmp_sdev,
 484                                                 MSG_SIMPLE_TAG,
 485                                                 tmp_sdev->queue_depth+1);
 486
 487                                 pnode->last_ramp_up_time = jiffies;
 488                         }
 489                 }
 490         }
 491
 492         /*
 493          * Check for queue full.  If the lun is reporting queue full, then
 494          * back off the lun queue depth to prevent target overloads.
 495          */
 496         if (result == SAM_STAT_TASK_SET_FULL && pnode != NULL) {
 497                 pnode->last_q_full_time = jiffies;
 498
 499                 shost_for_each_device(tmp_sdev, sdev->host) {
 500                         if (tmp_sdev->id != sdev->id)
 501                                 continue;
 502                         depth = scsi_track_queue_full(tmp_sdev,
 503                                         tmp_sdev->queue_depth - 1);
 504                 }
 505                 /*
 506                  * The queue depth cannot be lowered any more.
 507                  * Modify the returned error code to store
 508                  * the final depth value set by
 509                  * scsi_track_queue_full.
 510                  */
 511                 if (depth == -1)
 512                         depth = sdev->host->cmd_per_lun;
 513
 514                 if (depth) {
 515                         lpfc_printf_log(phba, KERN_WARNING, LOG_FCP,
 516                                 "%d:0711 detected queue full - lun queue depth "
 517                                 " adjusted to %d.\n", phba->brd_no, depth);
 518                 }
 519         }
 520
 521         lpfc_scsi_unprep_dma_buf(phba, lpfc_cmd);
 522         lpfc_release_scsi_buf(phba, lpfc_cmd);
 523 }
 524
 525 static void
 526 lpfc_scsi_prep_cmnd(struct lpfc_hba * phba, struct lpfc_scsi_buf * lpfc_cmd,
 527                         struct lpfc_nodelist *pnode)
 528 {
 529         struct scsi_cmnd *scsi_cmnd = lpfc_cmd->pCmd;
 530         struct fcp_cmnd *fcp_cmnd = lpfc_cmd->fcp_cmnd;
 531         IOCB_t *iocb_cmd = &lpfc_cmd->cur_iocbq.iocb;
 532         struct lpfc_iocbq *piocbq = &(lpfc_cmd->cur_iocbq);
 533         int datadir = scsi_cmnd->sc_data_direction;
 534
 535         lpfc_cmd->fcp_rsp->rspSnsLen = 0;
 536         /* clear task management bits */
 537         lpfc_cmd->fcp_cmnd->fcpCntl2 = 0;
 538
 539         int_to_scsilun(lpfc_cmd->pCmd->device->lun,
 540                         &lpfc_cmd->fcp_cmnd->fcp_lun);
 541
 542         memcpy(&fcp_cmnd->fcpCdb[0], scsi_cmnd->cmnd, 16);
 543
 544         if (scsi_cmnd->device->tagged_supported) {
 545                 switch (scsi_cmnd->tag) {
 546                 case HEAD_OF_QUEUE_TAG:
 547                         fcp_cmnd->fcpCntl1 = HEAD_OF_Q;
 548                         break;
 549                 case ORDERED_QUEUE_TAG:
 550                         fcp_cmnd->fcpCntl1 = ORDERED_Q;
 551                         break;
 552                 default:
 553                         fcp_cmnd->fcpCntl1 = SIMPLE_Q;
 554                         break;
 555                 }
 556         } else
 557                 fcp_cmnd->fcpCntl1 = 0;
 558
 559         /*
 560          * There are three possibilities here - use scatter-gather segment, use
 561          * the single mapping, or neither.  Start the lpfc command prep by
 562          * bumping the bpl beyond the fcp_cmnd and fcp_rsp regions to the first
 563          * data bde entry.
 564          */
 565         if (scsi_cmnd->use_sg) {
 566                 if (datadir == DMA_TO_DEVICE) {
 567                         iocb_cmd->ulpCommand = CMD_FCP_IWRITE64_CR;
 568                         iocb_cmd->un.fcpi.fcpi_parm = 0;
 569                         iocb_cmd->ulpPU = 0;
 570                         fcp_cmnd->fcpCntl3 = WRITE_DATA;
 571                         phba->fc4OutputRequests++;
 572                 } else {
 573                         iocb_cmd->ulpCommand = CMD_FCP_IREAD64_CR;
 574                         iocb_cmd->ulpPU = PARM_READ_CHECK;
 575                         iocb_cmd->un.fcpi.fcpi_parm =
 576                                 scsi_cmnd->request_bufflen;
 577                         fcp_cmnd->fcpCntl3 = READ_DATA;
 578                         phba->fc4InputRequests++;
 579                 }
 580         } else if (scsi_cmnd->request_buffer && scsi_cmnd->request_bufflen) {
 581                 if (datadir == DMA_TO_DEVICE) {
 582                         iocb_cmd->ulpCommand = CMD_FCP_IWRITE64_CR;
 583                         iocb_cmd->un.fcpi.fcpi_parm = 0;
 584                         iocb_cmd->ulpPU = 0;
 585                         fcp_cmnd->fcpCntl3 = WRITE_DATA;
 586                         phba->fc4OutputRequests++;
 587                 } else {
 588                         iocb_cmd->ulpCommand = CMD_FCP_IREAD64_CR;
 589                         iocb_cmd->ulpPU = PARM_READ_CHECK;
 590                         iocb_cmd->un.fcpi.fcpi_parm =
 591                                 scsi_cmnd->request_bufflen;
 592                         fcp_cmnd->fcpCntl3 = READ_DATA;
 593                         phba->fc4InputRequests++;
 594                 }
 595         } else {
 596                 iocb_cmd->ulpCommand = CMD_FCP_ICMND64_CR;
 597                 iocb_cmd->un.fcpi.fcpi_parm = 0;
 598                 iocb_cmd->ulpPU = 0;
 599                 fcp_cmnd->fcpCntl3 = 0;
 600                 phba->fc4ControlRequests++;
 601         }
 602
 603         /*
 604          * Finish initializing those IOCB fields that are independent
 605          * of the scsi_cmnd request_buffer
 606          */
 607         piocbq->iocb.ulpContext = pnode->nlp_rpi;
 608         if (pnode->nlp_fcp_info & NLP_FCP_2_DEVICE)
 609                 piocbq->iocb.ulpFCP2Rcvy = 1;
 610
 611         piocbq->iocb.ulpClass = (pnode->nlp_fcp_info & 0x0f);
 612         piocbq->context1  = lpfc_cmd;
 613         piocbq->iocb_cmpl = lpfc_scsi_cmd_iocb_cmpl;
 614         piocbq->iocb.ulpTimeout = lpfc_cmd->timeout;
 615 }
 616
 617 static int
 618 lpfc_scsi_prep_task_mgmt_cmd(struct lpfc_hba *phba,
 619                              struct lpfc_scsi_buf *lpfc_cmd,
 620                              unsigned int lun,
 621                              uint8_t task_mgmt_cmd)
 622 {
 623         struct lpfc_sli *psli;
 624         struct lpfc_iocbq *piocbq;
 625         IOCB_t *piocb;
 626         struct fcp_cmnd *fcp_cmnd;
 627         struct lpfc_rport_data *rdata = lpfc_cmd->rdata;
 628         struct lpfc_nodelist *ndlp = rdata->pnode;
 629
 630         if ((ndlp == NULL) || (ndlp->nlp_state != NLP_STE_MAPPED_NODE)) {
 631                 return 0;
 632         }
 633
 634         psli = &phba->sli;
 635         piocbq = &(lpfc_cmd->cur_iocbq);
 636         piocb = &piocbq->iocb;
 637
 638         fcp_cmnd = lpfc_cmd->fcp_cmnd;
 639         int_to_scsilun(lun, &lpfc_cmd->fcp_cmnd->fcp_lun);
 640         fcp_cmnd->fcpCntl2 = task_mgmt_cmd;
 641
 642         piocb->ulpCommand = CMD_FCP_ICMND64_CR;
 643
 644         piocb->ulpContext = ndlp->nlp_rpi;
 645         if (ndlp->nlp_fcp_info & NLP_FCP_2_DEVICE) {
 646                 piocb->ulpFCP2Rcvy = 1;
 647         }
 648         piocb->ulpClass = (ndlp->nlp_fcp_info & 0x0f);
 649
 650         /* ulpTimeout is only one byte */
 651         if (lpfc_cmd->timeout > 0xff) {
 652                 /*
 653                  * Do not timeout the command at the firmware level.
 654                  * The driver will provide the timeout mechanism.
 655                  */
 656                 piocb->ulpTimeout = 0;
 657         } else {
 658                 piocb->ulpTimeout = lpfc_cmd->timeout;
 659         }
 660
 661         return (1);
 662 }
 663
 664 static int
 665 lpfc_scsi_tgt_reset(struct lpfc_scsi_buf * lpfc_cmd, struct lpfc_hba * phba,
 666                     unsigned  tgt_id, unsigned int lun,
 667                     struct lpfc_rport_data *rdata)
 668 {
 669         struct lpfc_iocbq *iocbq;
 670         struct lpfc_iocbq *iocbqrsp;
 671         int ret;
 672
 673         lpfc_cmd->rdata = rdata;
 674         ret = lpfc_scsi_prep_task_mgmt_cmd(phba, lpfc_cmd, lun,
 675                                            FCP_TARGET_RESET);
 676         if (!ret)
 677                 return FAILED;
 678
 679         lpfc_cmd->scsi_hba = phba;
 680         iocbq = &lpfc_cmd->cur_iocbq;
 681         iocbqrsp = lpfc_sli_get_iocbq(phba);
 682
 683         if (!iocbqrsp)
 684                 return FAILED;
 685
 686         /* Issue Target Reset to TGT <num> */
 687         lpfc_printf_log(phba, KERN_INFO, LOG_FCP,
 688                         "%d:0702 Issue Target Reset to TGT %d "
 689                         "Data: x%x x%x\n",
 690                         phba->brd_no, tgt_id, rdata->pnode->nlp_rpi,
 691                         rdata->pnode->nlp_flag);
 692
 693         ret = lpfc_sli_issue_iocb_wait(phba,
 694                                        &phba->sli.ring[phba->sli.fcp_ring],
 695                                        iocbq, iocbqrsp, lpfc_cmd->timeout);
 696         if (ret != IOCB_SUCCESS) {
 697                 lpfc_cmd->status = IOSTAT_DRIVER_REJECT;
 698                 ret = FAILED;
 699         } else {
 700                 ret = SUCCESS;
 701                 lpfc_cmd->result = iocbqrsp->iocb.un.ulpWord[4];
 702                 lpfc_cmd->status = iocbqrsp->iocb.ulpStatus;
 703                 if (lpfc_cmd->status == IOSTAT_LOCAL_REJECT &&
 704                         (lpfc_cmd->result & IOERR_DRVR_MASK))
 705                                 lpfc_cmd->status = IOSTAT_DRIVER_REJECT;
 706         }
 707
 708         lpfc_sli_release_iocbq(phba, iocbqrsp);
 709         return ret;
 710 }
 711
 712 const char *
 713 lpfc_info(struct Scsi_Host *host)
 714 {
 715         struct lpfc_hba    *phba = (struct lpfc_hba *) host->hostdata;
 716         int len;
 717         static char  lpfcinfobuf[384];
 718
 719         memset(lpfcinfobuf,0,384);
 720         if (phba && phba->pcidev){
 721                 strncpy(lpfcinfobuf, phba->ModelDesc, 256);
 722                 len = strlen(lpfcinfobuf);
 723                 snprintf(lpfcinfobuf + len,
 724                         384-len,
 725                         " on PCI bus %02x device %02x irq %d",
 726                         phba->pcidev->bus->number,
 727                         phba->pcidev->devfn,
 728                         phba->pcidev->irq);
 729                 len = strlen(lpfcinfobuf);
 730                 if (phba->Port[0]) {
 731                         snprintf(lpfcinfobuf + len,
 732                                  384-len,
 733                                  " port %s",
 734                                  phba->Port);
 735                 }
 736         }
 737         return lpfcinfobuf;
 738 }
 739
 740 static __inline__ void lpfc_poll_rearm_timer(struct lpfc_hba * phba)
 741 {
 742         unsigned long  poll_tmo_expires =
 743                 (jiffies + msecs_to_jiffies(phba->cfg_poll_tmo));
 744
 745         if (phba->sli.ring[LPFC_FCP_RING].txcmplq_cnt)
 746                 mod_timer(&phba->fcp_poll_timer,
 747                           poll_tmo_expires);
 748 }
 749
 750 void lpfc_poll_start_timer(struct lpfc_hba * phba)
 751 {
 752         lpfc_poll_rearm_timer(phba);
 753 }
 754
 755 void lpfc_poll_timeout(unsigned long ptr)
 756 {
 757         struct lpfc_hba *phba = (struct lpfc_hba *)ptr;
 758         unsigned long iflag;
 759
 760         spin_lock_irqsave(phba->host->host_lock, iflag);
 761
 762         if (phba->cfg_poll & ENABLE_FCP_RING_POLLING) {
 763                 lpfc_sli_poll_fcp_ring (phba);
 764                 if (phba->cfg_poll & DISABLE_FCP_RING_INT)
 765                         lpfc_poll_rearm_timer(phba);
 766         }
 767
 768         spin_unlock_irqrestore(phba->host->host_lock, iflag);
 769 }
 770
 771 static int
 772 lpfc_queuecommand(struct scsi_cmnd *cmnd, void (*done) (struct scsi_cmnd *))
 773 {
 774         struct lpfc_hba *phba =
 775                 (struct lpfc_hba *) cmnd->device->host->hostdata;
 776         struct lpfc_sli *psli = &phba->sli;
 777         struct lpfc_rport_data *rdata = cmnd->device->hostdata;
 778         struct lpfc_nodelist *ndlp = rdata->pnode;
 779         struct lpfc_scsi_buf *lpfc_cmd;
 780         struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device));
 781         int err;
 782
 783         err = fc_remote_port_chkready(rport);
 784         if (err) {
 785                 cmnd->result = err;
 786                 goto out_fail_command;
 787         }
 788
 789         /*
 790          * Catch race where our node has transitioned, but the
 791          * transport is still transitioning.
 792          */
 793         if (!ndlp) {
 794                 cmnd->result = ScsiResult(DID_BUS_BUSY, 0);
 795                 goto out_fail_command;
 796         }
 797         lpfc_cmd = lpfc_get_scsi_buf (phba);
 798         if (lpfc_cmd == NULL) {
 799                 lpfc_printf_log(phba, KERN_INFO, LOG_FCP,
 800                                 "%d:0707 driver's buffer pool is empty, "
 801                                 "IO busied\n", phba->brd_no);
 802                 goto out_host_busy;
 803         }
 804
 805         /*
 806          * Store the midlayer's command structure for the completion phase
 807          * and complete the command initialization.
 808          */
 809         lpfc_cmd->pCmd  = cmnd;
 810         lpfc_cmd->rdata = rdata;
 811         lpfc_cmd->timeout = 0;
 812         cmnd->host_scribble = (unsigned char *)lpfc_cmd;
 813         cmnd->scsi_done = done;
 814
 815         err = lpfc_scsi_prep_dma_buf(phba, lpfc_cmd);
 816         if (err)
 817                 goto out_host_busy_free_buf;
 818
 819         lpfc_scsi_prep_cmnd(phba, lpfc_cmd, ndlp);
 820
 821         err = lpfc_sli_issue_iocb(phba, &phba->sli.ring[psli->fcp_ring],
 822                                 &lpfc_cmd->cur_iocbq, SLI_IOCB_RET_IOCB);
 823         if (err)
 824                 goto out_host_busy_free_buf;
 825
 826         if (phba->cfg_poll & ENABLE_FCP_RING_POLLING) {
 827                 lpfc_sli_poll_fcp_ring(phba);
 828                 if (phba->cfg_poll & DISABLE_FCP_RING_INT)
 829                         lpfc_poll_rearm_timer(phba);
 830         }
 831
 832         return 0;
 833
 834  out_host_busy_free_buf:
 835         lpfc_scsi_unprep_dma_buf(phba, lpfc_cmd);
 836         lpfc_release_scsi_buf(phba, lpfc_cmd);
 837  out_host_busy:
 838         return SCSI_MLQUEUE_HOST_BUSY;
 839
 840  out_fail_command:
 841         done(cmnd);
 842         return 0;
 843 }
 844
 845 static void
 846 lpfc_block_error_handler(struct scsi_cmnd *cmnd)
 847 {
 848         struct Scsi_Host *shost = cmnd->device->host;
 849         struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device));
 850
 851         spin_lock_irq(shost->host_lock);
 852         while (rport->port_state == FC_PORTSTATE_BLOCKED) {
 853                 spin_unlock_irq(shost->host_lock);
 854                 msleep(1000);
 855                 spin_lock_irq(shost->host_lock);
 856         }
 857         spin_unlock_irq(shost->host_lock);
 858         return;
 859 }
 860
 861 static int
 862 lpfc_abort_handler(struct scsi_cmnd *cmnd)
 863 {
 864         struct Scsi_Host *shost = cmnd->device->host;
 865         struct lpfc_hba *phba = (struct lpfc_hba *)shost->hostdata;
 866         struct lpfc_sli_ring *pring = &phba->sli.ring[phba->sli.fcp_ring];
 867         struct lpfc_iocbq *iocb;
 868         struct lpfc_iocbq *abtsiocb;
 869         struct lpfc_scsi_buf *lpfc_cmd;
 870         IOCB_t *cmd, *icmd;
 871         unsigned int loop_count = 0;
 872         int ret = SUCCESS;
 873
 874         lpfc_block_error_handler(cmnd);
 875         spin_lock_irq(shost->host_lock);
 876
 877         lpfc_cmd = (struct lpfc_scsi_buf *)cmnd->host_scribble;
 878         BUG_ON(!lpfc_cmd);
 879
 880         /*
 881          * If pCmd field of the corresponding lpfc_scsi_buf structure
 882          * points to a different SCSI command, then the driver has
 883          * already completed this command, but the midlayer did not
 884          * see the completion before the eh fired.  Just return
 885          * SUCCESS.
 886          */
 887         iocb = &lpfc_cmd->cur_iocbq;
 888         if (lpfc_cmd->pCmd != cmnd)
 889                 goto out;
 890
 891         BUG_ON(iocb->context1 != lpfc_cmd);
 892
 893         abtsiocb = lpfc_sli_get_iocbq(phba);
 894         if (abtsiocb == NULL) {
 895                 ret = FAILED;
 896                 goto out;
 897         }
 898
 899         /*
 900          * The scsi command can not be in txq and it is in flight because the
 901          * pCmd is still pointig at the SCSI command we have to abort. There
 902          * is no need to search the txcmplq. Just send an abort to the FW.
 903          */
 904
 905         cmd = &iocb->iocb;
 906         icmd = &abtsiocb->iocb;
 907         icmd->un.acxri.abortType = ABORT_TYPE_ABTS;
 908         icmd->un.acxri.abortContextTag = cmd->ulpContext;
 909         icmd->un.acxri.abortIoTag = cmd->ulpIoTag;
 910
 911         icmd->ulpLe = 1;
 912         icmd->ulpClass = cmd->ulpClass;
 913         if (phba->hba_state >= LPFC_LINK_UP)
 914                 icmd->ulpCommand = CMD_ABORT_XRI_CN;
 915         else
 916                 icmd->ulpCommand = CMD_CLOSE_XRI_CN;
 917
 918         abtsiocb->iocb_cmpl = lpfc_sli_abort_fcp_cmpl;
 919         if (lpfc_sli_issue_iocb(phba, pring, abtsiocb, 0) == IOCB_ERROR) {
 920                 lpfc_sli_release_iocbq(phba, abtsiocb);
 921                 ret = FAILED;
 922                 goto out;
 923         }
 924
 925         if (phba->cfg_poll & DISABLE_FCP_RING_INT)
 926                 lpfc_sli_poll_fcp_ring (phba);
 927
 928         /* Wait for abort to complete */
 929         while (lpfc_cmd->pCmd == cmnd)
 930         {
 931                 if (phba->cfg_poll & DISABLE_FCP_RING_INT)
 932                         lpfc_sli_poll_fcp_ring (phba);
 933
 934                 spin_unlock_irq(phba->host->host_lock);
 935                         schedule_timeout_uninterruptible(LPFC_ABORT_WAIT*HZ);
 936                 spin_lock_irq(phba->host->host_lock);
 937                 if (++loop_count
 938                     > (2 * phba->cfg_devloss_tmo)/LPFC_ABORT_WAIT)
 939                         break;
 940         }
 941
 942         if (lpfc_cmd->pCmd == cmnd) {
 943                 ret = FAILED;
 944                 lpfc_printf_log(phba, KERN_ERR, LOG_FCP,
 945                                 "%d:0748 abort handler timed out waiting for "
 946                                 "abort to complete: ret %#x, ID %d, LUN %d, "
 947                                 "snum %#lx\n",
 948                                 phba->brd_no,  ret, cmnd->device->id,
 949                                 cmnd->device->lun, cmnd->serial_number);
 950         }
 951
 952  out:
 953         lpfc_printf_log(phba, KERN_WARNING, LOG_FCP,
 954                         "%d:0749 SCSI Layer I/O Abort Request "
 955                         "Status x%x ID %d LUN %d snum %#lx\n",
 956                         phba->brd_no, ret, cmnd->device->id,
 957                         cmnd->device->lun, cmnd->serial_number);
 958
 959         spin_unlock_irq(shost->host_lock);
 960
 961         return ret;
 962 }
 963
 964 static int
 965 lpfc_reset_lun_handler(struct scsi_cmnd *cmnd)
 966 {
 967         struct Scsi_Host *shost = cmnd->device->host;
 968         struct lpfc_hba *phba = (struct lpfc_hba *)shost->hostdata;
 969         struct lpfc_scsi_buf *lpfc_cmd;
 970         struct lpfc_iocbq *iocbq, *iocbqrsp;
 971         struct lpfc_rport_data *rdata = cmnd->device->hostdata;
 972         struct lpfc_nodelist *pnode = rdata->pnode;
 973         uint32_t cmd_result = 0, cmd_status = 0;
 974         int ret = FAILED;
 975         int cnt, loopcnt;
 976
 977         lpfc_block_error_handler(cmnd);
 978         spin_lock_irq(shost->host_lock);
 979         /*
 980          * If target is not in a MAPPED state, delay the reset until
 981          * target is rediscovered or devloss timeout expires.
 982          */
 983         while ( 1 ) {
 984                 if (!pnode)
 985                         break;
 986
 987                 if (pnode->nlp_state != NLP_STE_MAPPED_NODE) {
 988                         spin_unlock_irq(phba->host->host_lock);
 989                         schedule_timeout_uninterruptible(msecs_to_jiffies(500));
 990                         spin_lock_irq(phba->host->host_lock);
 991                 }
 992                 if ((pnode) && (pnode->nlp_state == NLP_STE_MAPPED_NODE))
 993                         break;
 994         }
 995
 996         lpfc_cmd = lpfc_get_scsi_buf (phba);
 997         if (lpfc_cmd == NULL)
 998                 goto out;
 999
1000         lpfc_cmd->timeout = 60;
1001         lpfc_cmd->scsi_hba = phba;
1002         lpfc_cmd->rdata = rdata;
1003
1004         ret = lpfc_scsi_prep_task_mgmt_cmd(phba, lpfc_cmd, cmnd->device->lun,
1005                                            FCP_LUN_RESET);
1006         if (!ret)
1007                 goto out_free_scsi_buf;
1008
1009         iocbq = &lpfc_cmd->cur_iocbq;
1010
1011         /* get a buffer for this IOCB command response */
1012         iocbqrsp = lpfc_sli_get_iocbq(phba);
1013         if (iocbqrsp == NULL)
1014                 goto out_free_scsi_buf;
1015
1016         lpfc_printf_log(phba, KERN_INFO, LOG_FCP,
1017                         "%d:0703 Issue LUN Reset to TGT %d LUN %d "
1018                         "Data: x%x x%x\n", phba->brd_no, cmnd->device->id,
1019                         cmnd->device->lun, pnode->nlp_rpi, pnode->nlp_flag);
1020
1021         ret = lpfc_sli_issue_iocb_wait(phba,
1022                                        &phba->sli.ring[phba->sli.fcp_ring],
1023                                        iocbq, iocbqrsp, lpfc_cmd->timeout);
1024         if (ret == IOCB_SUCCESS)
1025                 ret = SUCCESS;
1026
1027
1028         cmd_result = iocbqrsp->iocb.un.ulpWord[4];
1029         cmd_status = iocbqrsp->iocb.ulpStatus;
1030
1031         lpfc_sli_release_iocbq(phba, iocbqrsp);
1032
1033         /*
1034          * All outstanding txcmplq I/Os should have been aborted by the device.
1035          * Unfortunately, some targets do not abide by this forcing the driver
1036          * to double check.
1037          */
1038         cnt = lpfc_sli_sum_iocb(phba, &phba->sli.ring[phba->sli.fcp_ring],
1039                                 cmnd->device->id, cmnd->device->lun,
1040                                 LPFC_CTX_LUN);
1041         if (cnt)
1042                 lpfc_sli_abort_iocb(phba,
1043                                     &phba->sli.ring[phba->sli.fcp_ring],
1044                                     cmnd->device->id, cmnd->device->lun,
1045                                     0, LPFC_CTX_LUN);
1046         loopcnt = 0;
1047         while(cnt) {
1048                 spin_unlock_irq(phba->host->host_lock);
1049                 schedule_timeout_uninterruptible(LPFC_RESET_WAIT*HZ);
1050                 spin_lock_irq(phba->host->host_lock);
1051
1052                 if (++loopcnt
1053                     > (2 * phba->cfg_devloss_tmo)/LPFC_RESET_WAIT)
1054                         break;
1055
1056                 cnt = lpfc_sli_sum_iocb(phba,
1057                                         &phba->sli.ring[phba->sli.fcp_ring],
1058                                         cmnd->device->id, cmnd->device->lun,
1059                                         LPFC_CTX_LUN);
1060         }
1061
1062         if (cnt) {
1063                 lpfc_printf_log(phba, KERN_ERR, LOG_FCP,
1064                         "%d:0719 LUN Reset I/O flush failure: cnt x%x\n",
1065                         phba->brd_no, cnt);
1066                 ret = FAILED;
1067         }
1068
1069 out_free_scsi_buf:
1070         lpfc_release_scsi_buf(phba, lpfc_cmd);
1071
1072         lpfc_printf_log(phba, KERN_ERR, LOG_FCP,
1073                         "%d:0713 SCSI layer issued LUN reset (%d, %d) "
1074                         "Data: x%x x%x x%x\n",
1075                         phba->brd_no, cmnd->device->id,cmnd->device->lun,
1076                         ret, cmd_status, cmd_result);
1077
1078 out:
1079         spin_unlock_irq(shost->host_lock);
1080         return ret;
1081 }
1082
1083 static int
1084 lpfc_reset_bus_handler(struct scsi_cmnd *cmnd)
1085 {
1086         struct Scsi_Host *shost = cmnd->device->host;
1087         struct lpfc_hba *phba = (struct lpfc_hba *)shost->hostdata;
1088         struct lpfc_nodelist *ndlp = NULL;
1089         int match;
1090         int ret = FAILED, i, err_count = 0;
1091         int cnt, loopcnt;
1092         struct lpfc_scsi_buf * lpfc_cmd;
1093
1094         lpfc_block_error_handler(cmnd);
1095         spin_lock_irq(shost->host_lock);
1096
1097         lpfc_cmd = lpfc_get_scsi_buf(phba);
1098         if (lpfc_cmd == NULL)
1099                 goto out;
1100
1101         /* The lpfc_cmd storage is reused.  Set all loop invariants. */
1102         lpfc_cmd->timeout = 60;
1103         lpfc_cmd->scsi_hba = phba;
1104
1105         /*
1106          * Since the driver manages a single bus device, reset all
1107          * targets known to the driver.  Should any target reset
1108          * fail, this routine returns failure to the midlayer.
1109          */
1110         for (i = 0; i < LPFC_MAX_TARGET; i++) {
1111                 /* Search the mapped list for this target ID */
1112                 match = 0;
1113                 list_for_each_entry(ndlp, &phba->fc_nlpmap_list, nlp_listp) {
1114                         if ((i == ndlp->nlp_sid) && ndlp->rport) {
1115                                 match = 1;
1116                                 break;
1117                         }
1118                 }
1119                 if (!match)
1120                         continue;
1121
1122                 ret = lpfc_scsi_tgt_reset(lpfc_cmd, phba, i, cmnd->device->lun,
1123                                           ndlp->rport->dd_data);
1124                 if (ret != SUCCESS) {
1125                         lpfc_printf_log(phba, KERN_ERR, LOG_FCP,
1126                                 "%d:0700 Bus Reset on target %d failed\n",
1127                                 phba->brd_no, i);
1128                         err_count++;
1129                 }
1130         }
1131
1132         if (err_count == 0)
1133                 ret = SUCCESS;
1134
1135         lpfc_release_scsi_buf(phba, lpfc_cmd);
1136
1137         /*
1138          * All outstanding txcmplq I/Os should have been aborted by
1139          * the targets.  Unfortunately, some targets do not abide by
1140          * this forcing the driver to double check.
1141          */
1142         cnt = lpfc_sli_sum_iocb(phba, &phba->sli.ring[phba->sli.fcp_ring],
1143                                 0, 0, LPFC_CTX_HOST);
1144         if (cnt)
1145                 lpfc_sli_abort_iocb(phba, &phba->sli.ring[phba->sli.fcp_ring],
1146                                     0, 0, 0, LPFC_CTX_HOST);
1147         loopcnt = 0;
1148         while(cnt) {
1149                 spin_unlock_irq(phba->host->host_lock);
1150                 schedule_timeout_uninterruptible(LPFC_RESET_WAIT*HZ);
1151                 spin_lock_irq(phba->host->host_lock);
1152
1153                 if (++loopcnt
1154                     > (2 * phba->cfg_devloss_tmo)/LPFC_RESET_WAIT)
1155                         break;
1156
1157                 cnt = lpfc_sli_sum_iocb(phba,
1158                                         &phba->sli.ring[phba->sli.fcp_ring],
1159                                         0, 0, LPFC_CTX_HOST);
1160         }
1161
1162         if (cnt) {
1163                 lpfc_printf_log(phba, KERN_ERR, LOG_FCP,
1164                    "%d:0715 Bus Reset I/O flush failure: cnt x%x left x%x\n",
1165                    phba->brd_no, cnt, i);
1166                 ret = FAILED;
1167         }
1168
1169         lpfc_printf_log(phba,
1170                         KERN_ERR,
1171                         LOG_FCP,
1172                         "%d:0714 SCSI layer issued Bus Reset Data: x%x\n",
1173                         phba->brd_no, ret);
1174 out:
1175         spin_unlock_irq(shost->host_lock);
1176         return ret;
1177 }
1178
1179 static int
1180 lpfc_slave_alloc(struct scsi_device *sdev)
1181 {
1182         struct lpfc_hba *phba = (struct lpfc_hba *)sdev->host->hostdata;
1183         struct lpfc_scsi_buf *scsi_buf = NULL;
1184         struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
1185         uint32_t total = 0, i;
1186         uint32_t num_to_alloc = 0;
1187         unsigned long flags;
1188
1189         if (!rport || fc_remote_port_chkready(rport))
1190                 return -ENXIO;
1191
1192         sdev->hostdata = rport->dd_data;
1193
1194         /*
1195          * Populate the cmds_per_lun count scsi_bufs into this host's globally
1196          * available list of scsi buffers.  Don't allocate more than the
1197          * HBA limit conveyed to the midlayer via the host structure.  The
1198          * formula accounts for the lun_queue_depth + error handlers + 1
1199          * extra.  This list of scsi bufs exists for the lifetime of the driver.
1200          */
1201         total = phba->total_scsi_bufs;
1202         num_to_alloc = phba->cfg_lun_queue_depth + 2;
1203         if (total >= phba->cfg_hba_queue_depth) {
1204                 lpfc_printf_log(phba, KERN_WARNING, LOG_FCP,
1205                                 "%d:0704 At limitation of %d preallocated "
1206                                 "command buffers\n", phba->brd_no, total);
1207                 return 0;
1208         } else if (total + num_to_alloc > phba->cfg_hba_queue_depth) {
1209                 lpfc_printf_log(phba, KERN_WARNING, LOG_FCP,
1210                                 "%d:0705 Allocation request of %d command "
1211                                 "buffers will exceed max of %d.  Reducing "
1212                                 "allocation request to %d.\n", phba->brd_no,
1213                                 num_to_alloc, phba->cfg_hba_queue_depth,
1214                                 (phba->cfg_hba_queue_depth - total));
1215                 num_to_alloc = phba->cfg_hba_queue_depth - total;
1216         }
1217
1218         for (i = 0; i < num_to_alloc; i++) {
1219                 scsi_buf = lpfc_new_scsi_buf(phba);
1220                 if (!scsi_buf) {
1221                         lpfc_printf_log(phba, KERN_ERR, LOG_FCP,
1222                                         "%d:0706 Failed to allocate command "
1223                                         "buffer\n", phba->brd_no);
1224                         break;
1225                 }
1226
1227                 spin_lock_irqsave(&phba->scsi_buf_list_lock, flags);
1228                 phba->total_scsi_bufs++;
1229                 list_add_tail(&scsi_buf->list, &phba->lpfc_scsi_buf_list);
1230                 spin_unlock_irqrestore(&phba->scsi_buf_list_lock, flags);
1231         }
1232         return 0;
1233 }
1234
1235 static int
1236 lpfc_slave_configure(struct scsi_device *sdev)
1237 {
1238         struct lpfc_hba *phba = (struct lpfc_hba *) sdev->host->hostdata;
1239         struct fc_rport *rport = starget_to_rport(sdev->sdev_target);
1240
1241         if (sdev->tagged_supported)
1242                 scsi_activate_tcq(sdev, phba->cfg_lun_queue_depth);
1243         else
1244                 scsi_deactivate_tcq(sdev, phba->cfg_lun_queue_depth);
1245
1246         /*
1247          * Initialize the fc transport attributes for the target
1248          * containing this scsi device.  Also note that the driver's
1249          * target pointer is stored in the starget_data for the
1250          * driver's sysfs entry point functions.
1251          */
1252         rport->dev_loss_tmo = phba->cfg_devloss_tmo;
1253
1254         if (phba->cfg_poll & ENABLE_FCP_RING_POLLING) {
1255                 lpfc_sli_poll_fcp_ring(phba);
1256                 if (phba->cfg_poll & DISABLE_FCP_RING_INT)
1257                         lpfc_poll_rearm_timer(phba);
1258         }
1259
1260         return 0;
1261 }
1262
1263 static void
1264 lpfc_slave_destroy(struct scsi_device *sdev)
1265 {
1266         sdev->hostdata = NULL;
1267         return;
1268 }
1269
1270 struct scsi_host_template lpfc_template = {
1271         .module                 = THIS_MODULE,
1272         .name                   = LPFC_DRIVER_NAME,
1273         .info                   = lpfc_info,
1274         .queuecommand           = lpfc_queuecommand,
1275         .eh_abort_handler       = lpfc_abort_handler,
1276         .eh_device_reset_handler= lpfc_reset_lun_handler,
1277         .eh_bus_reset_handler   = lpfc_reset_bus_handler,
1278         .slave_alloc            = lpfc_slave_alloc,
1279         .slave_configure        = lpfc_slave_configure,
1280         .slave_destroy          = lpfc_slave_destroy,
1281         .this_id                = -1,
1282         .sg_tablesize           = LPFC_SG_SEG_CNT,
1283         .cmd_per_lun            = LPFC_CMD_PER_LUN,
1284         .use_clustering         = ENABLE_CLUSTERING,
1285         .shost_attrs            = lpfc_host_attrs,
1286         .max_sectors            = 0xFFFF,
1287 };