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) 2004-2005 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 static inline void
  45 lpfc_block_requests(struct lpfc_hba * phba)
  46 {
  47         down(&phba->hba_can_block);
  48         scsi_block_requests(phba->host);
  49 }
  50
  51 static inline void
  52 lpfc_unblock_requests(struct lpfc_hba * phba)
  53 {
  54         scsi_unblock_requests(phba->host);
  55         up(&phba->hba_can_block);
  56 }
  57
  58 /*
  59  * This routine allocates a scsi buffer, which contains all the necessary
  60  * information needed to initiate a SCSI I/O.  The non-DMAable buffer region
  61  * contains information to build the IOCB.  The DMAable region contains
  62  * memory for the FCP CMND, FCP RSP, and the inital BPL.  In addition to
  63  * allocating memeory, the FCP CMND and FCP RSP BDEs are setup in the BPL
  64  * and the BPL BDE is setup in the IOCB.
  65  */
  66 static struct lpfc_scsi_buf *
  67 lpfc_new_scsi_buf(struct lpfc_hba * phba)
  68 {
  69         struct lpfc_scsi_buf *psb;
  70         struct ulp_bde64 *bpl;
  71         IOCB_t *iocb;
  72         dma_addr_t pdma_phys;
  73         uint16_t iotag;
  74
  75         psb = kmalloc(sizeof(struct lpfc_scsi_buf), GFP_KERNEL);
  76         if (!psb)
  77                 return NULL;
  78         memset(psb, 0, sizeof (struct lpfc_scsi_buf));
  79         psb->scsi_hba = phba;
  80
  81         /*
  82          * Get memory from the pci pool to map the virt space to pci bus space
  83          * for an I/O.  The DMA buffer includes space for the struct fcp_cmnd,
  84          * struct fcp_rsp and the number of bde's necessary to support the
  85          * sg_tablesize.
  86          */
  87         psb->data = pci_pool_alloc(phba->lpfc_scsi_dma_buf_pool, GFP_KERNEL,
  88                                                         &psb->dma_handle);
  89         if (!psb->data) {
  90                 kfree(psb);
  91                 return NULL;
  92         }
  93
  94         /* Initialize virtual ptrs to dma_buf region. */
  95         memset(psb->data, 0, phba->cfg_sg_dma_buf_size);
  96
  97         /* Allocate iotag for psb->cur_iocbq. */
  98         iotag = lpfc_sli_next_iotag(phba, &psb->cur_iocbq);
  99         if (iotag == 0) {
 100                 pci_pool_free(phba->lpfc_scsi_dma_buf_pool,
 101                               psb->data, psb->dma_handle);
 102                 kfree (psb);
 103                 return NULL;
 104         }
 105         psb->cur_iocbq.iocb_flag |= LPFC_IO_FCP;
 106
 107         psb->fcp_cmnd = psb->data;
 108         psb->fcp_rsp = psb->data + sizeof(struct fcp_cmnd);
 109         psb->fcp_bpl = psb->data + sizeof(struct fcp_cmnd) +
 110                                                         sizeof(struct fcp_rsp);
 111
 112         /* Initialize local short-hand pointers. */
 113         bpl = psb->fcp_bpl;
 114         pdma_phys = psb->dma_handle;
 115
 116         /*
 117          * The first two bdes are the FCP_CMD and FCP_RSP.  The balance are sg
 118          * list bdes.  Initialize the first two and leave the rest for
 119          * queuecommand.
 120          */
 121         bpl->addrHigh = le32_to_cpu(putPaddrHigh(pdma_phys));
 122         bpl->addrLow = le32_to_cpu(putPaddrLow(pdma_phys));
 123         bpl->tus.f.bdeSize = sizeof (struct fcp_cmnd);
 124         bpl->tus.f.bdeFlags = BUFF_USE_CMND;
 125         bpl->tus.w = le32_to_cpu(bpl->tus.w);
 126         bpl++;
 127
 128         /* Setup the physical region for the FCP RSP */
 129         pdma_phys += sizeof (struct fcp_cmnd);
 130         bpl->addrHigh = le32_to_cpu(putPaddrHigh(pdma_phys));
 131         bpl->addrLow = le32_to_cpu(putPaddrLow(pdma_phys));
 132         bpl->tus.f.bdeSize = sizeof (struct fcp_rsp);
 133         bpl->tus.f.bdeFlags = (BUFF_USE_CMND | BUFF_USE_RCV);
 134         bpl->tus.w = le32_to_cpu(bpl->tus.w);
 135
 136         /*
 137          * Since the IOCB for the FCP I/O is built into this lpfc_scsi_buf,
 138          * initialize it with all known data now.
 139          */
 140         pdma_phys += (sizeof (struct fcp_rsp));
 141         iocb = &psb->cur_iocbq.iocb;
 142         iocb->un.fcpi64.bdl.ulpIoTag32 = 0;
 143         iocb->un.fcpi64.bdl.addrHigh = putPaddrHigh(pdma_phys);
 144         iocb->un.fcpi64.bdl.addrLow = putPaddrLow(pdma_phys);
 145         iocb->un.fcpi64.bdl.bdeSize = (2 * sizeof (struct ulp_bde64));
 146         iocb->un.fcpi64.bdl.bdeFlags = BUFF_TYPE_BDL;
 147         iocb->ulpBdeCount = 1;
 148         iocb->ulpClass = CLASS3;
 149
 150         return psb;
 151 }
 152
 153 static struct lpfc_scsi_buf*
 154 lpfc_get_scsi_buf(struct lpfc_hba * phba)
 155 {
 156         struct  lpfc_scsi_buf * lpfc_cmd = NULL;
 157         struct list_head *scsi_buf_list = &phba->lpfc_scsi_buf_list;
 158         unsigned long iflag = 0;
 159
 160         spin_lock_irqsave(&phba->scsi_buf_list_lock, iflag);
 161         list_remove_head(scsi_buf_list, lpfc_cmd, struct lpfc_scsi_buf, list);
 162         spin_unlock_irqrestore(&phba->scsi_buf_list_lock, iflag);
 163         return  lpfc_cmd;
 164 }
 165
 166 static void
 167 lpfc_release_scsi_buf(struct lpfc_hba * phba, struct lpfc_scsi_buf * psb)
 168 {
 169         unsigned long iflag = 0;
 170         /*
 171          * There are only two special cases to consider.  (1) the scsi command
 172          * requested scatter-gather usage or (2) the scsi command allocated
 173          * a request buffer, but did not request use_sg.  There is a third
 174          * case, but it does not require resource deallocation.
 175          */
 176         if ((psb->seg_cnt > 0) && (psb->pCmd->use_sg)) {
 177                 dma_unmap_sg(&phba->pcidev->dev, psb->pCmd->request_buffer,
 178                                 psb->seg_cnt, psb->pCmd->sc_data_direction);
 179         } else {
 180                  if ((psb->nonsg_phys) && (psb->pCmd->request_bufflen)) {
 181                         dma_unmap_single(&phba->pcidev->dev, psb->nonsg_phys,
 182                                                 psb->pCmd->request_bufflen,
 183                                                 psb->pCmd->sc_data_direction);
 184                  }
 185         }
 186
 187         spin_lock_irqsave(&phba->scsi_buf_list_lock, iflag);
 188         psb->pCmd = NULL;
 189         list_add_tail(&psb->list, &phba->lpfc_scsi_buf_list);
 190         spin_unlock_irqrestore(&phba->scsi_buf_list_lock, iflag);
 191 }
 192
 193 static int
 194 lpfc_scsi_prep_dma_buf(struct lpfc_hba * phba, struct lpfc_scsi_buf * lpfc_cmd)
 195 {
 196         struct scsi_cmnd *scsi_cmnd = lpfc_cmd->pCmd;
 197         struct scatterlist *sgel = NULL;
 198         struct fcp_cmnd *fcp_cmnd = lpfc_cmd->fcp_cmnd;
 199         struct ulp_bde64 *bpl = lpfc_cmd->fcp_bpl;
 200         IOCB_t *iocb_cmd = &lpfc_cmd->cur_iocbq.iocb;
 201         dma_addr_t physaddr;
 202         uint32_t i, num_bde = 0;
 203         int datadir = scsi_cmnd->sc_data_direction;
 204         int dma_error;
 205
 206         /*
 207          * There are three possibilities here - use scatter-gather segment, use
 208          * the single mapping, or neither.  Start the lpfc command prep by
 209          * bumping the bpl beyond the fcp_cmnd and fcp_rsp regions to the first
 210          * data bde entry.
 211          */
 212         bpl += 2;
 213         if (scsi_cmnd->use_sg) {
 214                 /*
 215                  * The driver stores the segment count returned from pci_map_sg
 216                  * because this a count of dma-mappings used to map the use_sg
 217                  * pages.  They are not guaranteed to be the same for those
 218                  * architectures that implement an IOMMU.
 219                  */
 220                 sgel = (struct scatterlist *)scsi_cmnd->request_buffer;
 221                 lpfc_cmd->seg_cnt = dma_map_sg(&phba->pcidev->dev, sgel,
 222                                                 scsi_cmnd->use_sg, datadir);
 223                 if (lpfc_cmd->seg_cnt == 0)
 224                         return 1;
 225
 226                 if (lpfc_cmd->seg_cnt > phba->cfg_sg_seg_cnt) {
 227                         printk(KERN_ERR "%s: Too many sg segments from "
 228                                "dma_map_sg.  Config %d, seg_cnt %d",
 229                                __FUNCTION__, phba->cfg_sg_seg_cnt,
 230                                lpfc_cmd->seg_cnt);
 231                         dma_unmap_sg(&phba->pcidev->dev, sgel,
 232                                      lpfc_cmd->seg_cnt, datadir);
 233                         return 1;
 234                 }
 235
 236                 /*
 237                  * The driver established a maximum scatter-gather segment count
 238                  * during probe that limits the number of sg elements in any
 239                  * single scsi command.  Just run through the seg_cnt and format
 240                  * the bde's.
 241                  */
 242                 for (i = 0; i < lpfc_cmd->seg_cnt; i++) {
 243                         physaddr = sg_dma_address(sgel);
 244                         bpl->addrLow = le32_to_cpu(putPaddrLow(physaddr));
 245                         bpl->addrHigh = le32_to_cpu(putPaddrHigh(physaddr));
 246                         bpl->tus.f.bdeSize = sg_dma_len(sgel);
 247                         if (datadir == DMA_TO_DEVICE)
 248                                 bpl->tus.f.bdeFlags = 0;
 249                         else
 250                                 bpl->tus.f.bdeFlags = BUFF_USE_RCV;
 251                         bpl->tus.w = le32_to_cpu(bpl->tus.w);
 252                         bpl++;
 253                         sgel++;
 254                         num_bde++;
 255                 }
 256         } else if (scsi_cmnd->request_buffer && scsi_cmnd->request_bufflen) {
 257                 physaddr = dma_map_single(&phba->pcidev->dev,
 258                                           scsi_cmnd->request_buffer,
 259                                           scsi_cmnd->request_bufflen,
 260                                           datadir);
 261                 dma_error = dma_mapping_error(physaddr);
 262                 if (dma_error) {
 263                         lpfc_printf_log(phba, KERN_ERR, LOG_FCP,
 264                                 "%d:0718 Unable to dma_map_single "
 265                                 "request_buffer: x%x\n",
 266                                 phba->brd_no, dma_error);
 267                         return 1;
 268                 }
 269
 270                 lpfc_cmd->nonsg_phys = physaddr;
 271                 bpl->addrLow = le32_to_cpu(putPaddrLow(physaddr));
 272                 bpl->addrHigh = le32_to_cpu(putPaddrHigh(physaddr));
 273                 bpl->tus.f.bdeSize = scsi_cmnd->request_bufflen;
 274                 if (datadir == DMA_TO_DEVICE)
 275                         bpl->tus.f.bdeFlags = 0;
 276                 else
 277                         bpl->tus.f.bdeFlags = BUFF_USE_RCV;
 278                 bpl->tus.w = le32_to_cpu(bpl->tus.w);
 279                 num_bde = 1;
 280                 bpl++;
 281         }
 282
 283         /*
 284          * Finish initializing those IOCB fields that are dependent on the
 285          * scsi_cmnd request_buffer.  Note that the bdeSize is explicitly
 286          * reinitialized since all iocb memory resources are used many times
 287          * for transmit, receive, and continuation bpl's.
 288          */
 289         iocb_cmd->un.fcpi64.bdl.bdeSize = (2 * sizeof (struct ulp_bde64));
 290         iocb_cmd->un.fcpi64.bdl.bdeSize +=
 291                 (num_bde * sizeof (struct ulp_bde64));
 292         iocb_cmd->ulpBdeCount = 1;
 293         iocb_cmd->ulpLe = 1;
 294         fcp_cmnd->fcpDl = be32_to_cpu(scsi_cmnd->request_bufflen);
 295         return 0;
 296 }
 297
 298 static void
 299 lpfc_handle_fcp_err(struct lpfc_scsi_buf *lpfc_cmd)
 300 {
 301         struct scsi_cmnd *cmnd = lpfc_cmd->pCmd;
 302         struct fcp_cmnd *fcpcmd = lpfc_cmd->fcp_cmnd;
 303         struct fcp_rsp *fcprsp = lpfc_cmd->fcp_rsp;
 304         struct lpfc_hba *phba = lpfc_cmd->scsi_hba;
 305         uint32_t fcpi_parm = lpfc_cmd->cur_iocbq.iocb.un.fcpi.fcpi_parm;
 306         uint32_t resp_info = fcprsp->rspStatus2;
 307         uint32_t scsi_status = fcprsp->rspStatus3;
 308         uint32_t host_status = DID_OK;
 309         uint32_t rsplen = 0;
 310
 311         /*
 312          *  If this is a task management command, there is no
 313          *  scsi packet associated with this lpfc_cmd.  The driver
 314          *  consumes it.
 315          */
 316         if (fcpcmd->fcpCntl2) {
 317                 scsi_status = 0;
 318                 goto out;
 319         }
 320
 321         lpfc_printf_log(phba, KERN_WARNING, LOG_FCP,
 322                         "%d:0730 FCP command failed: RSP "
 323                         "Data: x%x x%x x%x x%x x%x x%x\n",
 324                         phba->brd_no, resp_info, scsi_status,
 325                         be32_to_cpu(fcprsp->rspResId),
 326                         be32_to_cpu(fcprsp->rspSnsLen),
 327                         be32_to_cpu(fcprsp->rspRspLen),
 328                         fcprsp->rspInfo3);
 329
 330         if (resp_info & RSP_LEN_VALID) {
 331                 rsplen = be32_to_cpu(fcprsp->rspRspLen);
 332                 if ((rsplen != 0 && rsplen != 4 && rsplen != 8) ||
 333                     (fcprsp->rspInfo3 != RSP_NO_FAILURE)) {
 334                         host_status = DID_ERROR;
 335                         goto out;
 336                 }
 337         }
 338
 339         if ((resp_info & SNS_LEN_VALID) && fcprsp->rspSnsLen) {
 340                 uint32_t snslen = be32_to_cpu(fcprsp->rspSnsLen);
 341                 if (snslen > SCSI_SENSE_BUFFERSIZE)
 342                         snslen = SCSI_SENSE_BUFFERSIZE;
 343
 344                 memcpy(cmnd->sense_buffer, &fcprsp->rspInfo0 + rsplen, snslen);
 345         }
 346
 347         cmnd->resid = 0;
 348         if (resp_info & RESID_UNDER) {
 349                 cmnd->resid = be32_to_cpu(fcprsp->rspResId);
 350
 351                 lpfc_printf_log(phba, KERN_INFO, LOG_FCP,
 352                                 "%d:0716 FCP Read Underrun, expected %d, "
 353                                 "residual %d Data: x%x x%x x%x\n", phba->brd_no,
 354                                 be32_to_cpu(fcpcmd->fcpDl), cmnd->resid,
 355                                 fcpi_parm, cmnd->cmnd[0], cmnd->underflow);
 356
 357                 /*
 358                  * The cmnd->underflow is the minimum number of bytes that must
 359                  * be transfered for this command.  Provided a sense condition
 360                  * is not present, make sure the actual amount transferred is at
 361                  * least the underflow value or fail.
 362                  */
 363                 if (!(resp_info & SNS_LEN_VALID) &&
 364                     (scsi_status == SAM_STAT_GOOD) &&
 365                     (cmnd->request_bufflen - cmnd->resid) < cmnd->underflow) {
 366                         lpfc_printf_log(phba, KERN_INFO, LOG_FCP,
 367                                         "%d:0717 FCP command x%x residual "
 368                                         "underrun converted to error "
 369                                         "Data: x%x x%x x%x\n", phba->brd_no,
 370                                         cmnd->cmnd[0], cmnd->request_bufflen,
 371                                         cmnd->resid, cmnd->underflow);
 372
 373                         host_status = DID_ERROR;
 374                 }
 375         } else if (resp_info & RESID_OVER) {
 376                 lpfc_printf_log(phba, KERN_WARNING, LOG_FCP,
 377                                 "%d:0720 FCP command x%x residual "
 378                                 "overrun error. Data: x%x x%x \n",
 379                                 phba->brd_no, cmnd->cmnd[0],
 380                                 cmnd->request_bufflen, cmnd->resid);
 381                 host_status = DID_ERROR;
 382
 383         /*
 384          * Check SLI validation that all the transfer was actually done
 385          * (fcpi_parm should be zero). Apply check only to reads.
 386          */
 387         } else if ((scsi_status == SAM_STAT_GOOD) && fcpi_parm &&
 388                         (cmnd->sc_data_direction == DMA_FROM_DEVICE)) {
 389                 lpfc_printf_log(phba, KERN_WARNING, LOG_FCP,
 390                         "%d:0734 FCP Read Check Error Data: "
 391                         "x%x x%x x%x x%x\n", phba->brd_no,
 392                         be32_to_cpu(fcpcmd->fcpDl),
 393                         be32_to_cpu(fcprsp->rspResId),
 394                         fcpi_parm, cmnd->cmnd[0]);
 395                 host_status = DID_ERROR;
 396                 cmnd->resid = cmnd->request_bufflen;
 397         }
 398
 399  out:
 400         cmnd->result = ScsiResult(host_status, scsi_status);
 401 }
 402
 403 static void
 404 lpfc_scsi_cmd_iocb_cmpl(struct lpfc_hba *phba, struct lpfc_iocbq *pIocbIn,
 405                         struct lpfc_iocbq *pIocbOut)
 406 {
 407         struct lpfc_scsi_buf *lpfc_cmd =
 408                 (struct lpfc_scsi_buf *) pIocbIn->context1;
 409         struct lpfc_rport_data *rdata = lpfc_cmd->rdata;
 410         struct lpfc_nodelist *pnode = rdata->pnode;
 411         struct scsi_cmnd *cmd = lpfc_cmd->pCmd;
 412         int result;
 413         struct scsi_device *sdev, *tmp_sdev;
 414         int depth = 0;
 415
 416         lpfc_cmd->result = pIocbOut->iocb.un.ulpWord[4];
 417         lpfc_cmd->status = pIocbOut->iocb.ulpStatus;
 418
 419         if (lpfc_cmd->status) {
 420                 if (lpfc_cmd->status == IOSTAT_LOCAL_REJECT &&
 421                     (lpfc_cmd->result & IOERR_DRVR_MASK))
 422                         lpfc_cmd->status = IOSTAT_DRIVER_REJECT;
 423                 else if (lpfc_cmd->status >= IOSTAT_CNT)
 424                         lpfc_cmd->status = IOSTAT_DEFAULT;
 425
 426                 lpfc_printf_log(phba, KERN_WARNING, LOG_FCP,
 427                                 "%d:0729 FCP cmd x%x failed <%d/%d> status: "
 428                                 "x%x result: x%x Data: x%x x%x\n",
 429                                 phba->brd_no, cmd->cmnd[0], cmd->device->id,
 430                                 cmd->device->lun, lpfc_cmd->status,
 431                                 lpfc_cmd->result, pIocbOut->iocb.ulpContext,
 432                                 lpfc_cmd->cur_iocbq.iocb.ulpIoTag);
 433
 434                 switch (lpfc_cmd->status) {
 435                 case IOSTAT_FCP_RSP_ERROR:
 436                         /* Call FCP RSP handler to determine result */
 437                         lpfc_handle_fcp_err(lpfc_cmd);
 438                         break;
 439                 case IOSTAT_NPORT_BSY:
 440                 case IOSTAT_FABRIC_BSY:
 441                         cmd->result = ScsiResult(DID_BUS_BUSY, 0);
 442                         break;
 443                 default:
 444                         cmd->result = ScsiResult(DID_ERROR, 0);
 445                         break;
 446                 }
 447
 448                 if ((pnode == NULL )
 449                     || (pnode->nlp_state != NLP_STE_MAPPED_NODE))
 450                         cmd->result = ScsiResult(DID_BUS_BUSY, SAM_STAT_BUSY);
 451         } else {
 452                 cmd->result = ScsiResult(DID_OK, 0);
 453         }
 454
 455         if (cmd->result || lpfc_cmd->fcp_rsp->rspSnsLen) {
 456                 uint32_t *lp = (uint32_t *)cmd->sense_buffer;
 457
 458                 lpfc_printf_log(phba, KERN_INFO, LOG_FCP,
 459                                 "%d:0710 Iodone <%d/%d> cmd %p, error x%x "
 460                                 "SNS x%x x%x Data: x%x x%x\n",
 461                                 phba->brd_no, cmd->device->id,
 462                                 cmd->device->lun, cmd, cmd->result,
 463                                 *lp, *(lp + 3), cmd->retries, cmd->resid);
 464         }
 465
 466         result = cmd->result;
 467         sdev = cmd->device;
 468         cmd->scsi_done(cmd);
 469
 470         if (!result &&
 471            ((jiffies - pnode->last_ramp_up_time) >
 472                 LPFC_Q_RAMP_UP_INTERVAL * HZ) &&
 473            ((jiffies - pnode->last_q_full_time) >
 474                 LPFC_Q_RAMP_UP_INTERVAL * HZ) &&
 475            (phba->cfg_lun_queue_depth > sdev->queue_depth)) {
 476                 shost_for_each_device(tmp_sdev, sdev->host) {
 477                         if (phba->cfg_lun_queue_depth > tmp_sdev->queue_depth) {
 478                                 if (tmp_sdev->id != sdev->id)
 479                                         continue;
 480                                 if (tmp_sdev->ordered_tags)
 481                                         scsi_adjust_queue_depth(tmp_sdev,
 482                                                 MSG_ORDERED_TAG,
 483                                                 tmp_sdev->queue_depth+1);
 484                                 else
 485                                         scsi_adjust_queue_depth(tmp_sdev,
 486                                                 MSG_SIMPLE_TAG,
 487                                                 tmp_sdev->queue_depth+1);
 488
 489                                 pnode->last_ramp_up_time = jiffies;
 490                         }
 491                 }
 492         }
 493
 494         /*
 495          * Check for queue full.  If the lun is reporting queue full, then
 496          * back off the lun queue depth to prevent target overloads.
 497          */
 498         if (result == SAM_STAT_TASK_SET_FULL) {
 499                 pnode->last_q_full_time = jiffies;
 500
 501                 shost_for_each_device(tmp_sdev, sdev->host) {
 502                         if (tmp_sdev->id != sdev->id)
 503                                 continue;
 504                         depth = scsi_track_queue_full(tmp_sdev,
 505                                         tmp_sdev->queue_depth - 1);
 506                 }
 507                 /*
 508                  * The queue depth cannot be lowered any more.
 509                  * Modify the returned error code to store
 510                  * the final depth value set by
 511                  * scsi_track_queue_full.
 512                  */
 513                 if (depth == -1)
 514                         depth = sdev->host->cmd_per_lun;
 515
 516                 if (depth) {
 517                         lpfc_printf_log(phba, KERN_WARNING, LOG_FCP,
 518                                 "%d:0711 detected queue full - lun queue depth "
 519                                 " adjusted to %d.\n", phba->brd_no, depth);
 520                 }
 521         }
 522
 523         lpfc_release_scsi_buf(phba, lpfc_cmd);
 524 }
 525
 526 static void
 527 lpfc_scsi_prep_cmnd(struct lpfc_hba * phba, struct lpfc_scsi_buf * lpfc_cmd,
 528                         struct lpfc_nodelist *pnode)
 529 {
 530         struct scsi_cmnd *scsi_cmnd = lpfc_cmd->pCmd;
 531         struct fcp_cmnd *fcp_cmnd = lpfc_cmd->fcp_cmnd;
 532         IOCB_t *iocb_cmd = &lpfc_cmd->cur_iocbq.iocb;
 533         struct lpfc_iocbq *piocbq = &(lpfc_cmd->cur_iocbq);
 534         int datadir = scsi_cmnd->sc_data_direction;
 535
 536         lpfc_cmd->fcp_rsp->rspSnsLen = 0;
 537         /* clear task management bits */
 538         lpfc_cmd->fcp_cmnd->fcpCntl2 = 0;
 539
 540         int_to_scsilun(lpfc_cmd->pCmd->device->lun,
 541                         &lpfc_cmd->fcp_cmnd->fcp_lun);
 542
 543         memcpy(&fcp_cmnd->fcpCdb[0], scsi_cmnd->cmnd, 16);
 544
 545         if (scsi_cmnd->device->tagged_supported) {
 546                 switch (scsi_cmnd->tag) {
 547                 case HEAD_OF_QUEUE_TAG:
 548                         fcp_cmnd->fcpCntl1 = HEAD_OF_Q;
 549                         break;
 550                 case ORDERED_QUEUE_TAG:
 551                         fcp_cmnd->fcpCntl1 = ORDERED_Q;
 552                         break;
 553                 default:
 554                         fcp_cmnd->fcpCntl1 = SIMPLE_Q;
 555                         break;
 556                 }
 557         } else
 558                 fcp_cmnd->fcpCntl1 = 0;
 559
 560         /*
 561          * There are three possibilities here - use scatter-gather segment, use
 562          * the single mapping, or neither.  Start the lpfc command prep by
 563          * bumping the bpl beyond the fcp_cmnd and fcp_rsp regions to the first
 564          * data bde entry.
 565          */
 566         if (scsi_cmnd->use_sg) {
 567                 if (datadir == DMA_TO_DEVICE) {
 568                         iocb_cmd->ulpCommand = CMD_FCP_IWRITE64_CR;
 569                         iocb_cmd->un.fcpi.fcpi_parm = 0;
 570                         iocb_cmd->ulpPU = 0;
 571                         fcp_cmnd->fcpCntl3 = WRITE_DATA;
 572                         phba->fc4OutputRequests++;
 573                 } else {
 574                         iocb_cmd->ulpCommand = CMD_FCP_IREAD64_CR;
 575                         iocb_cmd->ulpPU = PARM_READ_CHECK;
 576                         iocb_cmd->un.fcpi.fcpi_parm =
 577                                 scsi_cmnd->request_bufflen;
 578                         fcp_cmnd->fcpCntl3 = READ_DATA;
 579                         phba->fc4InputRequests++;
 580                 }
 581         } else if (scsi_cmnd->request_buffer && scsi_cmnd->request_bufflen) {
 582                 if (datadir == DMA_TO_DEVICE) {
 583                         iocb_cmd->ulpCommand = CMD_FCP_IWRITE64_CR;
 584                         iocb_cmd->un.fcpi.fcpi_parm = 0;
 585                         iocb_cmd->ulpPU = 0;
 586                         fcp_cmnd->fcpCntl3 = WRITE_DATA;
 587                         phba->fc4OutputRequests++;
 588                 } else {
 589                         iocb_cmd->ulpCommand = CMD_FCP_IREAD64_CR;
 590                         iocb_cmd->ulpPU = PARM_READ_CHECK;
 591                         iocb_cmd->un.fcpi.fcpi_parm =
 592                                 scsi_cmnd->request_bufflen;
 593                         fcp_cmnd->fcpCntl3 = READ_DATA;
 594                         phba->fc4InputRequests++;
 595                 }
 596         } else {
 597                 iocb_cmd->ulpCommand = CMD_FCP_ICMND64_CR;
 598                 iocb_cmd->un.fcpi.fcpi_parm = 0;
 599                 iocb_cmd->ulpPU = 0;
 600                 fcp_cmnd->fcpCntl3 = 0;
 601                 phba->fc4ControlRequests++;
 602         }
 603
 604         /*
 605          * Finish initializing those IOCB fields that are independent
 606          * of the scsi_cmnd request_buffer
 607          */
 608         piocbq->iocb.ulpContext = pnode->nlp_rpi;
 609         if (pnode->nlp_fcp_info & NLP_FCP_2_DEVICE)
 610                 piocbq->iocb.ulpFCP2Rcvy = 1;
 611
 612         piocbq->iocb.ulpClass = (pnode->nlp_fcp_info & 0x0f);
 613         piocbq->context1  = lpfc_cmd;
 614         piocbq->iocb_cmpl = lpfc_scsi_cmd_iocb_cmpl;
 615         piocbq->iocb.ulpTimeout = lpfc_cmd->timeout;
 616 }
 617
 618 static int
 619 lpfc_scsi_prep_task_mgmt_cmd(struct lpfc_hba *phba,
 620                              struct lpfc_scsi_buf *lpfc_cmd,
 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 scsi_device *scsi_dev = lpfc_cmd->pCmd->device;
 628         struct lpfc_rport_data *rdata = scsi_dev->hostdata;
 629         struct lpfc_nodelist *ndlp = rdata->pnode;
 630
 631         if ((ndlp == NULL) || (ndlp->nlp_state != NLP_STE_MAPPED_NODE)) {
 632                 return 0;
 633         }
 634
 635         psli = &phba->sli;
 636         piocbq = &(lpfc_cmd->cur_iocbq);
 637         piocb = &piocbq->iocb;
 638
 639         fcp_cmnd = lpfc_cmd->fcp_cmnd;
 640         int_to_scsilun(lpfc_cmd->pCmd->device->lun,
 641                         &lpfc_cmd->fcp_cmnd->fcp_lun);
 642         fcp_cmnd->fcpCntl2 = task_mgmt_cmd;
 643
 644         piocb->ulpCommand = CMD_FCP_ICMND64_CR;
 645
 646         piocb->ulpContext = ndlp->nlp_rpi;
 647         if (ndlp->nlp_fcp_info & NLP_FCP_2_DEVICE) {
 648                 piocb->ulpFCP2Rcvy = 1;
 649         }
 650         piocb->ulpClass = (ndlp->nlp_fcp_info & 0x0f);
 651
 652         /* ulpTimeout is only one byte */
 653         if (lpfc_cmd->timeout > 0xff) {
 654                 /*
 655                  * Do not timeout the command at the firmware level.
 656                  * The driver will provide the timeout mechanism.
 657                  */
 658                 piocb->ulpTimeout = 0;
 659         } else {
 660                 piocb->ulpTimeout = lpfc_cmd->timeout;
 661         }
 662
 663         lpfc_cmd->rdata = rdata;
 664
 665         switch (task_mgmt_cmd) {
 666         case FCP_LUN_RESET:
 667                 /* Issue LUN Reset to TGT <num> LUN <num> */
 668                 lpfc_printf_log(phba,
 669                                 KERN_INFO,
 670                                 LOG_FCP,
 671                                 "%d:0703 Issue LUN Reset to TGT %d LUN %d "
 672                                 "Data: x%x x%x\n",
 673                                 phba->brd_no,
 674                                 scsi_dev->id, scsi_dev->lun,
 675                                 ndlp->nlp_rpi, ndlp->nlp_flag);
 676
 677                 break;
 678         case FCP_ABORT_TASK_SET:
 679                 /* Issue Abort Task Set to TGT <num> LUN <num> */
 680                 lpfc_printf_log(phba,
 681                                 KERN_INFO,
 682                                 LOG_FCP,
 683                                 "%d:0701 Issue Abort Task Set to TGT %d LUN %d "
 684                                 "Data: x%x x%x\n",
 685                                 phba->brd_no,
 686                                 scsi_dev->id, scsi_dev->lun,
 687                                 ndlp->nlp_rpi, ndlp->nlp_flag);
 688
 689                 break;
 690         case FCP_TARGET_RESET:
 691                 /* Issue Target Reset to TGT <num> */
 692                 lpfc_printf_log(phba,
 693                                 KERN_INFO,
 694                                 LOG_FCP,
 695                                 "%d:0702 Issue Target Reset to TGT %d "
 696                                 "Data: x%x x%x\n",
 697                                 phba->brd_no,
 698                                 scsi_dev->id, ndlp->nlp_rpi,
 699                                 ndlp->nlp_flag);
 700                 break;
 701         }
 702
 703         return (1);
 704 }
 705
 706 static int
 707 lpfc_scsi_tgt_reset(struct lpfc_scsi_buf * lpfc_cmd, struct lpfc_hba * phba)
 708 {
 709         struct lpfc_iocbq *iocbq;
 710         struct lpfc_iocbq *iocbqrsp;
 711         int ret;
 712
 713         ret = lpfc_scsi_prep_task_mgmt_cmd(phba, lpfc_cmd, FCP_TARGET_RESET);
 714         if (!ret)
 715                 return FAILED;
 716
 717         lpfc_cmd->scsi_hba = phba;
 718         iocbq = &lpfc_cmd->cur_iocbq;
 719         iocbqrsp = lpfc_sli_get_iocbq(phba);
 720
 721         if (!iocbqrsp)
 722                 return FAILED;
 723
 724         ret = lpfc_sli_issue_iocb_wait(phba,
 725                                        &phba->sli.ring[phba->sli.fcp_ring],
 726                                        iocbq, iocbqrsp, lpfc_cmd->timeout);
 727         if (ret != IOCB_SUCCESS) {
 728                 lpfc_cmd->status = IOSTAT_DRIVER_REJECT;
 729                 ret = FAILED;
 730         } else {
 731                 ret = SUCCESS;
 732                 lpfc_cmd->result = iocbqrsp->iocb.un.ulpWord[4];
 733                 lpfc_cmd->status = iocbqrsp->iocb.ulpStatus;
 734                 if (lpfc_cmd->status == IOSTAT_LOCAL_REJECT &&
 735                         (lpfc_cmd->result & IOERR_DRVR_MASK))
 736                                 lpfc_cmd->status = IOSTAT_DRIVER_REJECT;
 737         }
 738
 739         lpfc_sli_release_iocbq(phba, iocbqrsp);
 740         return ret;
 741 }
 742
 743 const char *
 744 lpfc_info(struct Scsi_Host *host)
 745 {
 746         struct lpfc_hba    *phba = (struct lpfc_hba *) host->hostdata;
 747         int len;
 748         static char  lpfcinfobuf[384];
 749
 750         memset(lpfcinfobuf,0,384);
 751         if (phba && phba->pcidev){
 752                 strncpy(lpfcinfobuf, phba->ModelDesc, 256);
 753                 len = strlen(lpfcinfobuf);
 754                 snprintf(lpfcinfobuf + len,
 755                         384-len,
 756                         " on PCI bus %02x device %02x irq %d",
 757                         phba->pcidev->bus->number,
 758                         phba->pcidev->devfn,
 759                         phba->pcidev->irq);
 760                 len = strlen(lpfcinfobuf);
 761                 if (phba->Port[0]) {
 762                         snprintf(lpfcinfobuf + len,
 763                                  384-len,
 764                                  " port %s",
 765                                  phba->Port);
 766                 }
 767         }
 768         return lpfcinfobuf;
 769 }
 770
 771 static __inline__ void lpfc_poll_rearm_timer(struct lpfc_hba * phba)
 772 {
 773         unsigned long  poll_tmo_expires =
 774                 (jiffies + msecs_to_jiffies(phba->cfg_poll_tmo));
 775
 776         if (phba->sli.ring[LPFC_FCP_RING].txcmplq_cnt)
 777                 mod_timer(&phba->fcp_poll_timer,
 778                           poll_tmo_expires);
 779 }
 780
 781 void lpfc_poll_start_timer(struct lpfc_hba * phba)
 782 {
 783         lpfc_poll_rearm_timer(phba);
 784 }
 785
 786 void lpfc_poll_timeout(unsigned long ptr)
 787 {
 788         struct lpfc_hba *phba = (struct lpfc_hba *)ptr;
 789         unsigned long iflag;
 790
 791         spin_lock_irqsave(phba->host->host_lock, iflag);
 792
 793         if (phba->cfg_poll & ENABLE_FCP_RING_POLLING) {
 794                 lpfc_sli_poll_fcp_ring (phba);
 795                 if (phba->cfg_poll & DISABLE_FCP_RING_INT)
 796                         lpfc_poll_rearm_timer(phba);
 797         }
 798
 799         spin_unlock_irqrestore(phba->host->host_lock, iflag);
 800 }
 801
 802 static int
 803 lpfc_queuecommand(struct scsi_cmnd *cmnd, void (*done) (struct scsi_cmnd *))
 804 {
 805         struct lpfc_hba *phba =
 806                 (struct lpfc_hba *) cmnd->device->host->hostdata;
 807         struct lpfc_sli *psli = &phba->sli;
 808         struct lpfc_rport_data *rdata = cmnd->device->hostdata;
 809         struct lpfc_nodelist *ndlp = rdata->pnode;
 810         struct lpfc_scsi_buf *lpfc_cmd;
 811         struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device));
 812         int err;
 813
 814         err = fc_remote_port_chkready(rport);
 815         if (err) {
 816                 cmnd->result = err;
 817                 goto out_fail_command;
 818         }
 819
 820         /*
 821          * Catch race where our node has transitioned, but the
 822          * transport is still transitioning.
 823          */
 824         if (!ndlp) {
 825                 cmnd->result = ScsiResult(DID_BUS_BUSY, 0);
 826                 goto out_fail_command;
 827         }
 828         lpfc_cmd = lpfc_get_scsi_buf (phba);
 829         if (lpfc_cmd == NULL) {
 830                 lpfc_printf_log(phba, KERN_INFO, LOG_FCP,
 831                                 "%d:0707 driver's buffer pool is empty, "
 832                                 "IO busied\n", phba->brd_no);
 833                 goto out_host_busy;
 834         }
 835
 836         /*
 837          * Store the midlayer's command structure for the completion phase
 838          * and complete the command initialization.
 839          */
 840         lpfc_cmd->pCmd  = cmnd;
 841         lpfc_cmd->rdata = rdata;
 842         lpfc_cmd->timeout = 0;
 843         cmnd->host_scribble = (unsigned char *)lpfc_cmd;
 844         cmnd->scsi_done = done;
 845
 846         err = lpfc_scsi_prep_dma_buf(phba, lpfc_cmd);
 847         if (err)
 848                 goto out_host_busy_free_buf;
 849
 850         lpfc_scsi_prep_cmnd(phba, lpfc_cmd, ndlp);
 851
 852         err = lpfc_sli_issue_iocb(phba, &phba->sli.ring[psli->fcp_ring],
 853                                 &lpfc_cmd->cur_iocbq, SLI_IOCB_RET_IOCB);
 854         if (err)
 855                 goto out_host_busy_free_buf;
 856
 857         if (phba->cfg_poll & ENABLE_FCP_RING_POLLING) {
 858                 lpfc_sli_poll_fcp_ring(phba);
 859                 if (phba->cfg_poll & DISABLE_FCP_RING_INT)
 860                         lpfc_poll_rearm_timer(phba);
 861         }
 862
 863         return 0;
 864
 865  out_host_busy_free_buf:
 866         lpfc_release_scsi_buf(phba, lpfc_cmd);
 867  out_host_busy:
 868         return SCSI_MLQUEUE_HOST_BUSY;
 869
 870  out_fail_command:
 871         done(cmnd);
 872         return 0;
 873 }
 874
 875
 876 static int
 877 lpfc_abort_handler(struct scsi_cmnd *cmnd)
 878 {
 879         struct Scsi_Host *shost = cmnd->device->host;
 880         struct lpfc_hba *phba = (struct lpfc_hba *)shost->hostdata;
 881         struct lpfc_sli_ring *pring = &phba->sli.ring[phba->sli.fcp_ring];
 882         struct lpfc_iocbq *iocb;
 883         struct lpfc_iocbq *abtsiocb;
 884         struct lpfc_scsi_buf *lpfc_cmd;
 885         IOCB_t *cmd, *icmd;
 886         unsigned int loop_count = 0;
 887         int ret = SUCCESS;
 888
 889         lpfc_block_requests(phba);
 890         spin_lock_irq(shost->host_lock);
 891
 892         lpfc_cmd = (struct lpfc_scsi_buf *)cmnd->host_scribble;
 893         BUG_ON(!lpfc_cmd);
 894
 895         /*
 896          * If pCmd field of the corresponding lpfc_scsi_buf structure
 897          * points to a different SCSI command, then the driver has
 898          * already completed this command, but the midlayer did not
 899          * see the completion before the eh fired.  Just return
 900          * SUCCESS.
 901          */
 902         iocb = &lpfc_cmd->cur_iocbq;
 903         if (lpfc_cmd->pCmd != cmnd)
 904                 goto out;
 905
 906         BUG_ON(iocb->context1 != lpfc_cmd);
 907
 908         abtsiocb = lpfc_sli_get_iocbq(phba);
 909         if (abtsiocb == NULL) {
 910                 ret = FAILED;
 911                 goto out;
 912         }
 913
 914         /*
 915          * The scsi command can not be in txq and it is in flight because the
 916          * pCmd is still pointig at the SCSI command we have to abort. There
 917          * is no need to search the txcmplq. Just send an abort to the FW.
 918          */
 919
 920         cmd = &iocb->iocb;
 921         icmd = &abtsiocb->iocb;
 922         icmd->un.acxri.abortType = ABORT_TYPE_ABTS;
 923         icmd->un.acxri.abortContextTag = cmd->ulpContext;
 924         icmd->un.acxri.abortIoTag = cmd->ulpIoTag;
 925
 926         icmd->ulpLe = 1;
 927         icmd->ulpClass = cmd->ulpClass;
 928         if (phba->hba_state >= LPFC_LINK_UP)
 929                 icmd->ulpCommand = CMD_ABORT_XRI_CN;
 930         else
 931                 icmd->ulpCommand = CMD_CLOSE_XRI_CN;
 932
 933         abtsiocb->iocb_cmpl = lpfc_sli_abort_fcp_cmpl;
 934         if (lpfc_sli_issue_iocb(phba, pring, abtsiocb, 0) == IOCB_ERROR) {
 935                 lpfc_sli_release_iocbq(phba, abtsiocb);
 936                 ret = FAILED;
 937                 goto out;
 938         }
 939
 940         if (phba->cfg_poll & DISABLE_FCP_RING_INT)
 941                 lpfc_sli_poll_fcp_ring (phba);
 942
 943         /* Wait for abort to complete */
 944         while (lpfc_cmd->pCmd == cmnd)
 945         {
 946                 if (phba->cfg_poll & DISABLE_FCP_RING_INT)
 947                         lpfc_sli_poll_fcp_ring (phba);
 948
 949                 spin_unlock_irq(phba->host->host_lock);
 950                         schedule_timeout_uninterruptible(LPFC_ABORT_WAIT*HZ);
 951                 spin_lock_irq(phba->host->host_lock);
 952                 if (++loop_count
 953                     > (2 * phba->cfg_nodev_tmo)/LPFC_ABORT_WAIT)
 954                         break;
 955         }
 956
 957         if (lpfc_cmd->pCmd == cmnd) {
 958                 ret = FAILED;
 959                 lpfc_printf_log(phba, KERN_ERR, LOG_FCP,
 960                                 "%d:0748 abort handler timed out waiting for "
 961                                 "abort to complete: ret %#x, ID %d, LUN %d, "
 962                                 "snum %#lx\n",
 963                                 phba->brd_no,  ret, cmnd->device->id,
 964                                 cmnd->device->lun, cmnd->serial_number);
 965         }
 966
 967  out:
 968         lpfc_printf_log(phba, KERN_WARNING, LOG_FCP,
 969                         "%d:0749 SCSI Layer I/O Abort Request "
 970                         "Status x%x ID %d LUN %d snum %#lx\n",
 971                         phba->brd_no, ret, cmnd->device->id,
 972                         cmnd->device->lun, cmnd->serial_number);
 973
 974         spin_unlock_irq(shost->host_lock);
 975         lpfc_unblock_requests(phba);
 976
 977         return ret;
 978 }
 979
 980 static int
 981 lpfc_reset_lun_handler(struct scsi_cmnd *cmnd)
 982 {
 983         struct Scsi_Host *shost = cmnd->device->host;
 984         struct lpfc_hba *phba = (struct lpfc_hba *)shost->hostdata;
 985         struct lpfc_scsi_buf *lpfc_cmd;
 986         struct lpfc_iocbq *iocbq, *iocbqrsp;
 987         struct lpfc_rport_data *rdata = cmnd->device->hostdata;
 988         struct lpfc_nodelist *pnode = rdata->pnode;
 989         uint32_t cmd_result = 0, cmd_status = 0;
 990         int ret = FAILED;
 991         int cnt, loopcnt;
 992
 993         lpfc_block_requests(phba);
 994         spin_lock_irq(shost->host_lock);
 995         /*
 996          * If target is not in a MAPPED state, delay the reset until
 997          * target is rediscovered or nodev timeout expires.
 998          */
 999         while ( 1 ) {
1000                 if (!pnode)
1001                         break;
1002
1003                 if (pnode->nlp_state != NLP_STE_MAPPED_NODE) {
1004                         spin_unlock_irq(phba->host->host_lock);
1005                         schedule_timeout_uninterruptible(msecs_to_jiffies(500));
1006                         spin_lock_irq(phba->host->host_lock);
1007                 }
1008                 if ((pnode) && (pnode->nlp_state == NLP_STE_MAPPED_NODE))
1009                         break;
1010         }
1011
1012         lpfc_cmd = lpfc_get_scsi_buf (phba);
1013         if (lpfc_cmd == NULL)
1014                 goto out;
1015
1016         lpfc_cmd->pCmd = cmnd;
1017         lpfc_cmd->timeout = 60;
1018         lpfc_cmd->scsi_hba = phba;
1019
1020         ret = lpfc_scsi_prep_task_mgmt_cmd(phba, lpfc_cmd, FCP_LUN_RESET);
1021         if (!ret)
1022                 goto out_free_scsi_buf;
1023
1024         iocbq = &lpfc_cmd->cur_iocbq;
1025
1026         /* get a buffer for this IOCB command response */
1027         iocbqrsp = lpfc_sli_get_iocbq(phba);
1028         if (iocbqrsp == NULL)
1029                 goto out_free_scsi_buf;
1030
1031         ret = lpfc_sli_issue_iocb_wait(phba,
1032                                        &phba->sli.ring[phba->sli.fcp_ring],
1033                                        iocbq, iocbqrsp, lpfc_cmd->timeout);
1034         if (ret == IOCB_SUCCESS)
1035                 ret = SUCCESS;
1036
1037
1038         cmd_result = iocbqrsp->iocb.un.ulpWord[4];
1039         cmd_status = iocbqrsp->iocb.ulpStatus;
1040
1041         lpfc_sli_release_iocbq(phba, iocbqrsp);
1042         lpfc_release_scsi_buf(phba, lpfc_cmd);
1043
1044         /*
1045          * All outstanding txcmplq I/Os should have been aborted by the device.
1046          * Unfortunately, some targets do not abide by this forcing the driver
1047          * to double check.
1048          */
1049         cnt = lpfc_sli_sum_iocb(phba, &phba->sli.ring[phba->sli.fcp_ring],
1050                                 cmnd->device->id, cmnd->device->lun,
1051                                 LPFC_CTX_LUN);
1052         if (cnt)
1053                 lpfc_sli_abort_iocb(phba,
1054                                     &phba->sli.ring[phba->sli.fcp_ring],
1055                                     cmnd->device->id, cmnd->device->lun,
1056                                     0, LPFC_CTX_LUN);
1057         loopcnt = 0;
1058         while(cnt) {
1059                 spin_unlock_irq(phba->host->host_lock);
1060                 schedule_timeout_uninterruptible(LPFC_RESET_WAIT*HZ);
1061                 spin_lock_irq(phba->host->host_lock);
1062
1063                 if (++loopcnt
1064                     > (2 * phba->cfg_nodev_tmo)/LPFC_RESET_WAIT)
1065                         break;
1066
1067                 cnt = lpfc_sli_sum_iocb(phba,
1068                                         &phba->sli.ring[phba->sli.fcp_ring],
1069                                         cmnd->device->id, cmnd->device->lun,
1070                                         LPFC_CTX_LUN);
1071         }
1072
1073         if (cnt) {
1074                 lpfc_printf_log(phba, KERN_ERR, LOG_FCP,
1075                         "%d:0719 LUN Reset I/O flush failure: cnt x%x\n",
1076                         phba->brd_no, cnt);
1077                 ret = FAILED;
1078         }
1079
1080 out_free_scsi_buf:
1081         lpfc_printf_log(phba, KERN_ERR, LOG_FCP,
1082                         "%d:0713 SCSI layer issued LUN reset (%d, %d) "
1083                         "Data: x%x x%x x%x\n",
1084                         phba->brd_no, cmnd->device->id,cmnd->device->lun,
1085                         ret, cmd_status, cmd_result);
1086
1087 out:
1088         spin_unlock_irq(shost->host_lock);
1089         lpfc_unblock_requests(phba);
1090         return ret;
1091 }
1092
1093 static int
1094 lpfc_reset_bus_handler(struct scsi_cmnd *cmnd)
1095 {
1096         struct Scsi_Host *shost = cmnd->device->host;
1097         struct lpfc_hba *phba = (struct lpfc_hba *)shost->hostdata;
1098         struct lpfc_nodelist *ndlp = NULL;
1099         int match;
1100         int ret = FAILED, i, err_count = 0;
1101         int cnt, loopcnt;
1102         unsigned int midlayer_id = 0;
1103         struct lpfc_scsi_buf * lpfc_cmd;
1104
1105         lpfc_block_requests(phba);
1106         spin_lock_irq(shost->host_lock);
1107
1108         lpfc_cmd = lpfc_get_scsi_buf(phba);
1109         if (lpfc_cmd == NULL)
1110                 goto out;
1111
1112         /* The lpfc_cmd storage is reused.  Set all loop invariants. */
1113         lpfc_cmd->timeout = 60;
1114         lpfc_cmd->pCmd = cmnd;
1115         lpfc_cmd->scsi_hba = phba;
1116
1117         /*
1118          * Since the driver manages a single bus device, reset all
1119          * targets known to the driver.  Should any target reset
1120          * fail, this routine returns failure to the midlayer.
1121          */
1122         midlayer_id = cmnd->device->id;
1123         for (i = 0; i < MAX_FCP_TARGET; i++) {
1124                 /* Search the mapped list for this target ID */
1125                 match = 0;
1126                 list_for_each_entry(ndlp, &phba->fc_nlpmap_list, nlp_listp) {
1127                         if ((i == ndlp->nlp_sid) && ndlp->rport) {
1128                                 match = 1;
1129                                 break;
1130                         }
1131                 }
1132                 if (!match)
1133                         continue;
1134
1135                 lpfc_cmd->pCmd->device->id = i;
1136                 lpfc_cmd->pCmd->device->hostdata = ndlp->rport->dd_data;
1137                 ret = lpfc_scsi_tgt_reset(lpfc_cmd, phba);
1138                 if (ret != SUCCESS) {
1139                         lpfc_printf_log(phba, KERN_ERR, LOG_FCP,
1140                                 "%d:0713 Bus Reset on target %d failed\n",
1141                                 phba->brd_no, i);
1142                         err_count++;
1143                 }
1144         }
1145
1146         if (err_count == 0)
1147                 ret = SUCCESS;
1148
1149         lpfc_release_scsi_buf(phba, lpfc_cmd);
1150
1151         /*
1152          * All outstanding txcmplq I/Os should have been aborted by
1153          * the targets.  Unfortunately, some targets do not abide by
1154          * this forcing the driver to double check.
1155          */
1156         cmnd->device->id = midlayer_id;
1157         cnt = lpfc_sli_sum_iocb(phba, &phba->sli.ring[phba->sli.fcp_ring],
1158                                 0, 0, LPFC_CTX_HOST);
1159         if (cnt)
1160                 lpfc_sli_abort_iocb(phba, &phba->sli.ring[phba->sli.fcp_ring],
1161                                     0, 0, 0, LPFC_CTX_HOST);
1162         loopcnt = 0;
1163         while(cnt) {
1164                 spin_unlock_irq(phba->host->host_lock);
1165                 schedule_timeout_uninterruptible(LPFC_RESET_WAIT*HZ);
1166                 spin_lock_irq(phba->host->host_lock);
1167
1168                 if (++loopcnt
1169                     > (2 * phba->cfg_nodev_tmo)/LPFC_RESET_WAIT)
1170                         break;
1171
1172                 cnt = lpfc_sli_sum_iocb(phba,
1173                                         &phba->sli.ring[phba->sli.fcp_ring],
1174                                         0, 0, LPFC_CTX_HOST);
1175         }
1176
1177         if (cnt) {
1178                 lpfc_printf_log(phba, KERN_ERR, LOG_FCP,
1179                    "%d:0715 Bus Reset I/O flush failure: cnt x%x left x%x\n",
1180                    phba->brd_no, cnt, i);
1181                 ret = FAILED;
1182         }
1183
1184         lpfc_printf_log(phba,
1185                         KERN_ERR,
1186                         LOG_FCP,
1187                         "%d:0714 SCSI layer issued Bus Reset Data: x%x\n",
1188                         phba->brd_no, ret);
1189 out:
1190         spin_unlock_irq(shost->host_lock);
1191         lpfc_unblock_requests(phba);
1192         return ret;
1193 }
1194
1195 static int
1196 lpfc_slave_alloc(struct scsi_device *sdev)
1197 {
1198         struct lpfc_hba *phba = (struct lpfc_hba *)sdev->host->hostdata;
1199         struct lpfc_scsi_buf *scsi_buf = NULL;
1200         struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
1201         uint32_t total = 0, i;
1202         uint32_t num_to_alloc = 0;
1203         unsigned long flags;
1204
1205         if (!rport || fc_remote_port_chkready(rport))
1206                 return -ENXIO;
1207
1208         sdev->hostdata = rport->dd_data;
1209
1210         /*
1211          * Populate the cmds_per_lun count scsi_bufs into this host's globally
1212          * available list of scsi buffers.  Don't allocate more than the
1213          * HBA limit conveyed to the midlayer via the host structure.  The
1214          * formula accounts for the lun_queue_depth + error handlers + 1
1215          * extra.  This list of scsi bufs exists for the lifetime of the driver.
1216          */
1217         total = phba->total_scsi_bufs;
1218         num_to_alloc = phba->cfg_lun_queue_depth + 2;
1219         if (total >= phba->cfg_hba_queue_depth) {
1220                 lpfc_printf_log(phba, KERN_WARNING, LOG_FCP,
1221                                 "%d:0704 At limitation of %d preallocated "
1222                                 "command buffers\n", phba->brd_no, total);
1223                 return 0;
1224         } else if (total + num_to_alloc > phba->cfg_hba_queue_depth) {
1225                 lpfc_printf_log(phba, KERN_WARNING, LOG_FCP,
1226                                 "%d:0705 Allocation request of %d command "
1227                                 "buffers will exceed max of %d.  Reducing "
1228                                 "allocation request to %d.\n", phba->brd_no,
1229                                 num_to_alloc, phba->cfg_hba_queue_depth,
1230                                 (phba->cfg_hba_queue_depth - total));
1231                 num_to_alloc = phba->cfg_hba_queue_depth - total;
1232         }
1233
1234         for (i = 0; i < num_to_alloc; i++) {
1235                 scsi_buf = lpfc_new_scsi_buf(phba);
1236                 if (!scsi_buf) {
1237                         lpfc_printf_log(phba, KERN_ERR, LOG_FCP,
1238                                         "%d:0706 Failed to allocate command "
1239                                         "buffer\n", phba->brd_no);
1240                         break;
1241                 }
1242
1243                 spin_lock_irqsave(&phba->scsi_buf_list_lock, flags);
1244                 phba->total_scsi_bufs++;
1245                 list_add_tail(&scsi_buf->list, &phba->lpfc_scsi_buf_list);
1246                 spin_unlock_irqrestore(&phba->scsi_buf_list_lock, flags);
1247         }
1248         return 0;
1249 }
1250
1251 static int
1252 lpfc_slave_configure(struct scsi_device *sdev)
1253 {
1254         struct lpfc_hba *phba = (struct lpfc_hba *) sdev->host->hostdata;
1255         struct fc_rport *rport = starget_to_rport(sdev->sdev_target);
1256
1257         if (sdev->tagged_supported)
1258                 scsi_activate_tcq(sdev, phba->cfg_lun_queue_depth);
1259         else
1260                 scsi_deactivate_tcq(sdev, phba->cfg_lun_queue_depth);
1261
1262         /*
1263          * Initialize the fc transport attributes for the target
1264          * containing this scsi device.  Also note that the driver's
1265          * target pointer is stored in the starget_data for the
1266          * driver's sysfs entry point functions.
1267          */
1268         rport->dev_loss_tmo = phba->cfg_nodev_tmo + 5;
1269
1270         if (phba->cfg_poll & ENABLE_FCP_RING_POLLING) {
1271                 lpfc_sli_poll_fcp_ring(phba);
1272                 if (phba->cfg_poll & DISABLE_FCP_RING_INT)
1273                         lpfc_poll_rearm_timer(phba);
1274         }
1275
1276         return 0;
1277 }
1278
1279 static void
1280 lpfc_slave_destroy(struct scsi_device *sdev)
1281 {
1282         sdev->hostdata = NULL;
1283         return;
1284 }
1285
1286 struct scsi_host_template lpfc_template = {
1287         .module                 = THIS_MODULE,
1288         .name                   = LPFC_DRIVER_NAME,
1289         .info                   = lpfc_info,
1290         .queuecommand           = lpfc_queuecommand,
1291         .eh_abort_handler       = lpfc_abort_handler,
1292         .eh_device_reset_handler= lpfc_reset_lun_handler,
1293         .eh_bus_reset_handler   = lpfc_reset_bus_handler,
1294         .slave_alloc            = lpfc_slave_alloc,
1295         .slave_configure        = lpfc_slave_configure,
1296         .slave_destroy          = lpfc_slave_destroy,
1297         .this_id                = -1,
1298         .sg_tablesize           = LPFC_SG_SEG_CNT,
1299         .cmd_per_lun            = LPFC_CMD_PER_LUN,
1300         .use_clustering         = ENABLE_CLUSTERING,
1301         .shost_attrs            = lpfc_host_attrs,
1302         .max_sectors            = 0xFFFF,
1303 };