[SCSI] lpfc: convert to use the data buffer accessors

 This patch is a reworked version of the data buffer accessors patch
 so that it applies on the NPIV sources.

 The original patch was developed and submitted by Fujita Tomonori:
      FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
      http://marc.info/?l=linux-scsi&m=117896446832171&w=2

  - remove the unnecessary map_single path.

  - convert to use the new accessors for the sg lists and the
    parameters.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: James Smart <James.Smart@emulex.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

1 files changed, 28 insertions, 83 deletions

diff --git a/drivers/scsi/lpfc/lpfc_scsi.c b/drivers/scsi/lpfc/lpfc_scsi.c
index 2de4c4e1cd80..5d2e3de7de96 100644
--- a/drivers/scsi/lpfc/lpfc_scsi.c
+++ b/drivers/scsi/lpfc/lpfc_scsi.c
@@ -321,13 +321,9 @@ lpfc_scsi_prep_dma_buf(struct lpfc_hba *phba, struct lpfc_scsi_buf *lpfc_cmd)
         struct fcp_cmnd *fcp_cmnd = lpfc_cmd->fcp_cmnd;
         struct ulp_bde64 *bpl = lpfc_cmd->fcp_bpl;
         IOCB_t *iocb_cmd = &lpfc_cmd->cur_iocbq.iocb;
-        uint32_t vpi = (lpfc_cmd->cur_iocbq.vport
-                        ? lpfc_cmd->cur_iocbq.vport->vpi
-                        : 0);
         dma_addr_t physaddr;
         uint32_t i, num_bde = 0;
-        int datadir = scsi_cmnd->sc_data_direction;
-        int dma_error;
+        int nseg, datadir = scsi_cmnd->sc_data_direction;
 
         /*
          * There are three possibilities here - use scatter-gather segment, use
@@ -336,26 +332,22 @@ lpfc_scsi_prep_dma_buf(struct lpfc_hba *phba, struct lpfc_scsi_buf *lpfc_cmd)
          * data bde entry.
          */
         bpl += 2;
-        if (scsi_cmnd->use_sg) {
+        nseg = scsi_dma_map(scsi_cmnd);
+        if (nseg > 0) {
                 /*
                  * The driver stores the segment count returned from pci_map_sg
                  * because this a count of dma-mappings used to map the use_sg
                  * pages.  They are not guaranteed to be the same for those
                  * architectures that implement an IOMMU.
                  */
-                sgel = (struct scatterlist *)scsi_cmnd->request_buffer;
-                lpfc_cmd->seg_cnt = dma_map_sg(&phba->pcidev->dev, sgel,
-                                                scsi_cmnd->use_sg, datadir);
-                if (lpfc_cmd->seg_cnt == 0)
-                        return 1;
 
+                lpfc_cmd->seg_cnt = nseg;
                 if (lpfc_cmd->seg_cnt > phba->cfg_sg_seg_cnt) {
                         printk(KERN_ERR "%s: Too many sg segments from "
                                "dma_map_sg.  Config %d, seg_cnt %d",
                                __FUNCTION__, phba->cfg_sg_seg_cnt,
                                lpfc_cmd->seg_cnt);
-                        dma_unmap_sg(&phba->pcidev->dev, sgel,
-                                     lpfc_cmd->seg_cnt, datadir);
+                        scsi_dma_unmap(scsi_cmnd);
                         return 1;
                 }
 
@@ -365,7 +357,7 @@ lpfc_scsi_prep_dma_buf(struct lpfc_hba *phba, struct lpfc_scsi_buf *lpfc_cmd)
                  * single scsi command.  Just run through the seg_cnt and format
                  * the bde's.
                  */
-                for (i = 0; i < lpfc_cmd->seg_cnt; i++) {
+                scsi_for_each_sg(scsi_cmnd, sgel, nseg, i) {
                         physaddr = sg_dma_address(sgel);
                         bpl->addrLow = le32_to_cpu(putPaddrLow(physaddr));
                         bpl->addrHigh = le32_to_cpu(putPaddrHigh(physaddr));
@@ -376,35 +368,10 @@ lpfc_scsi_prep_dma_buf(struct lpfc_hba *phba, struct lpfc_scsi_buf *lpfc_cmd)
                                 bpl->tus.f.bdeFlags = BUFF_USE_RCV;
                         bpl->tus.w = le32_to_cpu(bpl->tus.w);
                         bpl++;
-                        sgel++;
                         num_bde++;
                 }
-        } else if (scsi_cmnd->request_buffer && scsi_cmnd->request_bufflen) {
-                physaddr = dma_map_single(&phba->pcidev->dev,
-                                          scsi_cmnd->request_buffer,
-                                          scsi_cmnd->request_bufflen,
-                                          datadir);
-                dma_error = dma_mapping_error(physaddr);
-                if (dma_error) {
-                        lpfc_printf_log(phba, KERN_ERR, LOG_FCP,
-                                        "%d (%d):0718 Unable to dma_map_single "
-                                        "request_buffer: x%x\n",
-                                        phba->brd_no, vpi, dma_error);
-                        return 1;
-                }
-
-                lpfc_cmd->nonsg_phys = physaddr;
-                bpl->addrLow = le32_to_cpu(putPaddrLow(physaddr));
-                bpl->addrHigh = le32_to_cpu(putPaddrHigh(physaddr));
-                bpl->tus.f.bdeSize = scsi_cmnd->request_bufflen;
-                if (datadir == DMA_TO_DEVICE)
-                        bpl->tus.f.bdeFlags = 0;
-                else
-                        bpl->tus.f.bdeFlags = BUFF_USE_RCV;
-                bpl->tus.w = le32_to_cpu(bpl->tus.w);
-                num_bde = 1;
-                bpl++;
-        }
+        } else if (nseg < 0)
+                return 1;
 
         /*
          * Finish initializing those IOCB fields that are dependent on the
@@ -417,7 +384,7 @@ lpfc_scsi_prep_dma_buf(struct lpfc_hba *phba, struct lpfc_scsi_buf *lpfc_cmd)
                 (num_bde * sizeof (struct ulp_bde64));
         iocb_cmd->ulpBdeCount = 1;
         iocb_cmd->ulpLe = 1;
-        fcp_cmnd->fcpDl = be32_to_cpu(scsi_cmnd->request_bufflen);
+        fcp_cmnd->fcpDl = be32_to_cpu(scsi_bufflen(scsi_cmnd));
         return 0;
 }
 
@@ -430,16 +397,8 @@ lpfc_scsi_unprep_dma_buf(struct lpfc_hba * phba, struct lpfc_scsi_buf * psb)
          * a request buffer, but did not request use_sg.  There is a third
          * case, but it does not require resource deallocation.
          */
-        if ((psb->seg_cnt > 0) && (psb->pCmd->use_sg)) {
-                dma_unmap_sg(&phba->pcidev->dev, psb->pCmd->request_buffer,
-                                psb->seg_cnt, psb->pCmd->sc_data_direction);
-        } else {
-                 if ((psb->nonsg_phys) && (psb->pCmd->request_bufflen)) {
-                        dma_unmap_single(&phba->pcidev->dev, psb->nonsg_phys,
-                                                psb->pCmd->request_bufflen,
-                                                psb->pCmd->sc_data_direction);
-                 }
-        }
+        if (psb->seg_cnt > 0)
+                scsi_dma_unmap(psb->pCmd);
 }
 
 static void
@@ -502,15 +461,15 @@ lpfc_handle_fcp_err(struct lpfc_vport *vport, struct lpfc_scsi_buf *lpfc_cmd,
                 }
         }
 
-        cmnd->resid = 0;
+        scsi_set_resid(cmnd, 0);
         if (resp_info & RESID_UNDER) {
-                cmnd->resid = be32_to_cpu(fcprsp->rspResId);
+                scsi_set_resid(cmnd, be32_to_cpu(fcprsp->rspResId));
 
                 lpfc_printf_log(phba, KERN_INFO, LOG_FCP,
                                 "%d (%d):0716 FCP Read Underrun, expected %d, "
                                 "residual %d Data: x%x x%x x%x\n",
                                 phba->brd_no, vpi, be32_to_cpu(fcpcmd->fcpDl),
-                                cmnd->resid, fcpi_parm, cmnd->cmnd[0],
+                                scsi_get_resid(cmnd), fcpi_parm, cmnd->cmnd[0],
                                 cmnd->underflow);
 
                 /*
@@ -520,15 +479,16 @@ lpfc_handle_fcp_err(struct lpfc_vport *vport, struct lpfc_scsi_buf *lpfc_cmd,
                  */
                 if ((cmnd->sc_data_direction == DMA_FROM_DEVICE) &&
                         fcpi_parm &&
-                        (cmnd->resid != fcpi_parm)) {
+                        (scsi_get_resid(cmnd) != fcpi_parm)) {
                         lpfc_printf_log(phba, KERN_WARNING,
                                         LOG_FCP | LOG_FCP_ERROR,
                                         "%d (%d):0735 FCP Read Check Error "
                                         "and Underrun Data: x%x x%x x%x x%x\n",
                                         phba->brd_no, vpi,
                                         be32_to_cpu(fcpcmd->fcpDl),
-                                        cmnd->resid, fcpi_parm, cmnd->cmnd[0]);
-                        cmnd->resid = cmnd->request_bufflen;
+                                        scsi_get_resid(cmnd), fcpi_parm,
+                                        cmnd->cmnd[0]);
+                        scsi_set_resid(cmnd, scsi_bufflen(cmnd));
                         host_status = DID_ERROR;
                 }
                 /*
@@ -539,15 +499,15 @@ lpfc_handle_fcp_err(struct lpfc_vport *vport, struct lpfc_scsi_buf *lpfc_cmd,
                  */
                 if (!(resp_info & SNS_LEN_VALID) &&
                     (scsi_status == SAM_STAT_GOOD) &&
-                    (cmnd->request_bufflen - cmnd->resid) < cmnd->underflow) {
+                    (scsi_bufflen(cmnd) - scsi_get_resid(cmnd)
+                     < cmnd->underflow)) {
                         lpfc_printf_log(phba, KERN_INFO, LOG_FCP,
                                         "%d (%d):0717 FCP command x%x residual "
                                         "underrun converted to error "
                                         "Data: x%x x%x x%x\n",
                                         phba->brd_no, vpi, cmnd->cmnd[0],
-                                        cmnd->request_bufflen, cmnd->resid,
-                                        cmnd->underflow);
-
+                                        cmnd->request_bufflen,
+                                        scsi_get_resid(cmnd), cmnd->underflow);
                         host_status = DID_ERROR;
                 }
         } else if (resp_info & RESID_OVER) {
@@ -555,7 +515,7 @@ lpfc_handle_fcp_err(struct lpfc_vport *vport, struct lpfc_scsi_buf *lpfc_cmd,
                                 "%d (%d):0720 FCP command x%x residual "
                                 "overrun error. Data: x%x x%x \n",
                                 phba->brd_no, vpi, cmnd->cmnd[0],
-                                cmnd->request_bufflen, cmnd->resid);
+                                scsi_bufflen(cmnd), scsi_get_resid(cmnd));
                 host_status = DID_ERROR;
 
         /*
@@ -572,7 +532,7 @@ lpfc_handle_fcp_err(struct lpfc_vport *vport, struct lpfc_scsi_buf *lpfc_cmd,
                                 be32_to_cpu(fcprsp->rspResId),
                                 fcpi_parm, cmnd->cmnd[0]);
                 host_status = DID_ERROR;
-                cmnd->resid = cmnd->request_bufflen;
+                scsi_set_resid(cmnd, scsi_bufflen(cmnd));
         }
 
  out:
@@ -652,7 +612,8 @@ lpfc_scsi_cmd_iocb_cmpl(struct lpfc_hba *phba, struct lpfc_iocbq *pIocbIn,
                                 "x%x SNS x%x x%x Data: x%x x%x\n",
                                 phba->brd_no, vpi, cmd->device->id,
                                 cmd->device->lun, cmd, cmd->result,
-                                *lp, *(lp + 3), cmd->retries, cmd->resid);
+                                *lp, *(lp + 3), cmd->retries,
+                                scsi_get_resid(cmd));
         }
 
         result = cmd->result;
@@ -767,22 +728,7 @@ lpfc_scsi_prep_cmnd(struct lpfc_vport *vport, struct lpfc_scsi_buf *lpfc_cmd,
          * bumping the bpl beyond the fcp_cmnd and fcp_rsp regions to the first
          * data bde entry.
          */
-        if (scsi_cmnd->use_sg) {
-                if (datadir == DMA_TO_DEVICE) {
-                        iocb_cmd->ulpCommand = CMD_FCP_IWRITE64_CR;
-                        iocb_cmd->un.fcpi.fcpi_parm = 0;
-                        iocb_cmd->ulpPU = 0;
-                        fcp_cmnd->fcpCntl3 = WRITE_DATA;
-                        phba->fc4OutputRequests++;
-                } else {
-                        iocb_cmd->ulpCommand = CMD_FCP_IREAD64_CR;
-                        iocb_cmd->ulpPU = PARM_READ_CHECK;
-                        iocb_cmd->un.fcpi.fcpi_parm =
-                                scsi_cmnd->request_bufflen;
-                        fcp_cmnd->fcpCntl3 = READ_DATA;
-                        phba->fc4InputRequests++;
-                }
-        } else if (scsi_cmnd->request_buffer && scsi_cmnd->request_bufflen) {
+        if (scsi_sg_count(scsi_cmnd)) {
                 if (datadir == DMA_TO_DEVICE) {
                         iocb_cmd->ulpCommand = CMD_FCP_IWRITE64_CR;
                         iocb_cmd->un.fcpi.fcpi_parm = 0;
@@ -792,8 +738,7 @@ lpfc_scsi_prep_cmnd(struct lpfc_vport *vport, struct lpfc_scsi_buf *lpfc_cmd,
                 } else {
                         iocb_cmd->ulpCommand = CMD_FCP_IREAD64_CR;
                         iocb_cmd->ulpPU = PARM_READ_CHECK;
-                        iocb_cmd->un.fcpi.fcpi_parm =
-                                scsi_cmnd->request_bufflen;
+                        iocb_cmd->un.fcpi.fcpi_parm = scsi_bufflen(scsi_cmnd);
                         fcp_cmnd->fcpCntl3 = READ_DATA;
                         phba->fc4InputRequests++;
                 }