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