[safe/jmp/linux-2.6] / drivers / scsi / lpfc / lpfc_scsi.c

/*******************************************************************
 * This file is part of the Emulex Linux Device Driver for         *
 * Fibre Channel Host Bus Adapters.                                *
 * Copyright (C) 2004-2005 Emulex.  All rights reserved.           *
 * EMULEX and SLI are trademarks of Emulex.                        *
 * www.emulex.com                                                  *
 * Portions Copyright (C) 2004-2005 Christoph Hellwig              *
 *                                                                 *
 * This program is free software; you can redistribute it and/or   *
 * modify it under the terms of version 2 of the GNU General       *
 * Public License as published by the Free Software Foundation.    *
 * This program is distributed in the hope that it will be useful. *
 * ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND          *
 * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,  *
 * FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT, ARE      *
 * DISCLAIMED, EXCEPT TO THE EXTENT THAT SUCH DISCLAIMERS ARE HELD *
 * TO BE LEGALLY INVALID.  See the GNU General Public License for  *
 * more details, a copy of which can be found in the file COPYING  *
 * included with this package.                                     *
 *******************************************************************/

#include <linux/pci.h>
#include <linux/interrupt.h>

#include <scsi/scsi.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_tcq.h>
#include <scsi/scsi_transport_fc.h>

#include "lpfc_version.h"
#include "lpfc_hw.h"
#include "lpfc_sli.h"
#include "lpfc_disc.h"
#include "lpfc_scsi.h"
#include "lpfc.h"
#include "lpfc_logmsg.h"
#include "lpfc_crtn.h"

#define LPFC_RESET_WAIT  2
#define LPFC_ABORT_WAIT  2


/*
 * This routine allocates a scsi buffer, which contains all the necessary
 * information needed to initiate a SCSI I/O.  The non-DMAable buffer region
 * contains information to build the IOCB.  The DMAable region contains
 * memory for the FCP CMND, FCP RSP, and the inital BPL.  In addition to
 * allocating memeory, the FCP CMND and FCP RSP BDEs are setup in the BPL
 * and the BPL BDE is setup in the IOCB.
 */
static struct lpfc_scsi_buf *
lpfc_new_scsi_buf(struct lpfc_hba * phba)
{
        struct lpfc_scsi_buf *psb;
        struct ulp_bde64 *bpl;
        IOCB_t *iocb;
        dma_addr_t pdma_phys;
        uint16_t iotag;

        psb = kmalloc(sizeof(struct lpfc_scsi_buf), GFP_KERNEL);
        if (!psb)
                return NULL;
        memset(psb, 0, sizeof (struct lpfc_scsi_buf));
        psb->scsi_hba = phba;

        /*
         * Get memory from the pci pool to map the virt space to pci bus space
         * for an I/O.  The DMA buffer includes space for the struct fcp_cmnd,
         * struct fcp_rsp and the number of bde's necessary to support the
         * sg_tablesize.
         */
        psb->data = pci_pool_alloc(phba->lpfc_scsi_dma_buf_pool, GFP_KERNEL,
                                                        &psb->dma_handle);
        if (!psb->data) {
                kfree(psb);
                return NULL;
        }

        /* Initialize virtual ptrs to dma_buf region. */
        memset(psb->data, 0, phba->cfg_sg_dma_buf_size);

        /* Allocate iotag for psb->cur_iocbq. */
        iotag = lpfc_sli_next_iotag(phba, &psb->cur_iocbq);
        if (iotag == 0) {
                pci_pool_free(phba->lpfc_scsi_dma_buf_pool,
                              psb->data, psb->dma_handle);
                kfree (psb);
                return NULL;
        }
        psb->cur_iocbq.iocb_flag |= LPFC_IO_FCP;

        psb->fcp_cmnd = psb->data;
        psb->fcp_rsp = psb->data + sizeof(struct fcp_cmnd);
        psb->fcp_bpl = psb->data + sizeof(struct fcp_cmnd) +
                                                        sizeof(struct fcp_rsp);

        /* Initialize local short-hand pointers. */
        bpl = psb->fcp_bpl;
        pdma_phys = psb->dma_handle;

        /*
         * The first two bdes are the FCP_CMD and FCP_RSP.  The balance are sg
         * list bdes.  Initialize the first two and leave the rest for
         * queuecommand.
         */
        bpl->addrHigh = le32_to_cpu(putPaddrHigh(pdma_phys));
        bpl->addrLow = le32_to_cpu(putPaddrLow(pdma_phys));
        bpl->tus.f.bdeSize = sizeof (struct fcp_cmnd);
        bpl->tus.f.bdeFlags = BUFF_USE_CMND;
        bpl->tus.w = le32_to_cpu(bpl->tus.w);
        bpl++;

        /* Setup the physical region for the FCP RSP */
        pdma_phys += sizeof (struct fcp_cmnd);
        bpl->addrHigh = le32_to_cpu(putPaddrHigh(pdma_phys));
        bpl->addrLow = le32_to_cpu(putPaddrLow(pdma_phys));
        bpl->tus.f.bdeSize = sizeof (struct fcp_rsp);
        bpl->tus.f.bdeFlags = (BUFF_USE_CMND | BUFF_USE_RCV);
        bpl->tus.w = le32_to_cpu(bpl->tus.w);

        /*
         * Since the IOCB for the FCP I/O is built into this lpfc_scsi_buf,
         * initialize it with all known data now.
         */
        pdma_phys += (sizeof (struct fcp_rsp));
        iocb = &psb->cur_iocbq.iocb;
        iocb->un.fcpi64.bdl.ulpIoTag32 = 0;
        iocb->un.fcpi64.bdl.addrHigh = putPaddrHigh(pdma_phys);
        iocb->un.fcpi64.bdl.addrLow = putPaddrLow(pdma_phys);
        iocb->un.fcpi64.bdl.bdeSize = (2 * sizeof (struct ulp_bde64));
        iocb->un.fcpi64.bdl.bdeFlags = BUFF_TYPE_BDL;
        iocb->ulpBdeCount = 1;
        iocb->ulpClass = CLASS3;

        return psb;
}

struct  lpfc_scsi_buf*
lpfc_sli_get_scsi_buf(struct lpfc_hba * phba)
{
        struct  lpfc_scsi_buf * lpfc_cmd = NULL;
        struct list_head *scsi_buf_list = &phba->lpfc_scsi_buf_list;

        list_remove_head(scsi_buf_list, lpfc_cmd, struct lpfc_scsi_buf, list);
        return  lpfc_cmd;
}

static void
lpfc_release_scsi_buf(struct lpfc_hba * phba, struct lpfc_scsi_buf * psb)
{
        /*
         * There are only two special cases to consider.  (1) the scsi command
         * requested scatter-gather usage or (2) the scsi command allocated
         * 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);
                 }
        }

        psb->pCmd = NULL;
        list_add_tail(&psb->list, &phba->lpfc_scsi_buf_list);
}

static int
lpfc_scsi_prep_dma_buf(struct lpfc_hba * phba, struct lpfc_scsi_buf * lpfc_cmd)
{
        struct scsi_cmnd *scsi_cmnd = lpfc_cmd->pCmd;
        struct scatterlist *sgel = NULL;
        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;
        dma_addr_t physaddr;
        uint32_t i, num_bde = 0;
        int datadir = scsi_cmnd->sc_data_direction;
        int dma_error;

        /*
         * There are three possibilities here - use scatter-gather segment, use
         * the single mapping, or neither.  Start the lpfc command prep by
         * bumping the bpl beyond the fcp_cmnd and fcp_rsp regions to the first
         * data bde entry.
         */
        bpl += 2;
        if (scsi_cmnd->use_sg) {
                /*
                 * 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;

                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);
                        return 1;
                }

                /*
                 * The driver established a maximum scatter-gather segment count
                 * during probe that limits the number of sg elements in any
                 * single scsi command.  Just run through the seg_cnt and format
                 * the bde's.
                 */
                for (i = 0; i < lpfc_cmd->seg_cnt; i++) {
                        physaddr = sg_dma_address(sgel);
                        bpl->addrLow = le32_to_cpu(putPaddrLow(physaddr));
                        bpl->addrHigh = le32_to_cpu(putPaddrHigh(physaddr));
                        bpl->tus.f.bdeSize = sg_dma_len(sgel);
                        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);
                        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:0718 Unable to dma_map_single "
                                "request_buffer: x%x\n",
                                phba->brd_no, 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++;
        }

        /*
         * Finish initializing those IOCB fields that are dependent on the
         * scsi_cmnd request_buffer.  Note that the bdeSize is explicitly
         * reinitialized since all iocb memory resources are used many times
         * for transmit, receive, and continuation bpl's.
         */
        iocb_cmd->un.fcpi64.bdl.bdeSize = (2 * sizeof (struct ulp_bde64));
        iocb_cmd->un.fcpi64.bdl.bdeSize +=
                (num_bde * sizeof (struct ulp_bde64));
        iocb_cmd->ulpBdeCount = 1;
        iocb_cmd->ulpLe = 1;
        fcp_cmnd->fcpDl = be32_to_cpu(scsi_cmnd->request_bufflen);
        return 0;
}

static void
lpfc_handle_fcp_err(struct lpfc_scsi_buf *lpfc_cmd)
{
        struct scsi_cmnd *cmnd = lpfc_cmd->pCmd;
        struct fcp_cmnd *fcpcmd = lpfc_cmd->fcp_cmnd;
        struct fcp_rsp *fcprsp = lpfc_cmd->fcp_rsp;
        struct lpfc_hba *phba = lpfc_cmd->scsi_hba;
        uint32_t fcpi_parm = lpfc_cmd->cur_iocbq.iocb.un.fcpi.fcpi_parm;
        uint32_t resp_info = fcprsp->rspStatus2;
        uint32_t scsi_status = fcprsp->rspStatus3;
        uint32_t host_status = DID_OK;
        uint32_t rsplen = 0;

        /*
         *  If this is a task management command, there is no
         *  scsi packet associated with this lpfc_cmd.  The driver
         *  consumes it.
         */
        if (fcpcmd->fcpCntl2) {
                scsi_status = 0;
                goto out;
        }

        lpfc_printf_log(phba, KERN_WARNING, LOG_FCP,
                        "%d:0730 FCP command failed: RSP "
                        "Data: x%x x%x x%x x%x x%x x%x\n",
                        phba->brd_no, resp_info, scsi_status,
                        be32_to_cpu(fcprsp->rspResId),
                        be32_to_cpu(fcprsp->rspSnsLen),
                        be32_to_cpu(fcprsp->rspRspLen),
                        fcprsp->rspInfo3);

        if (resp_info & RSP_LEN_VALID) {
                rsplen = be32_to_cpu(fcprsp->rspRspLen);
                if ((rsplen != 0 && rsplen != 4 && rsplen != 8) ||
                    (fcprsp->rspInfo3 != RSP_NO_FAILURE)) {
                        host_status = DID_ERROR;
                        goto out;
                }
        }

        if ((resp_info & SNS_LEN_VALID) && fcprsp->rspSnsLen) {
                uint32_t snslen = be32_to_cpu(fcprsp->rspSnsLen);
                if (snslen > SCSI_SENSE_BUFFERSIZE)
                        snslen = SCSI_SENSE_BUFFERSIZE;

                memcpy(cmnd->sense_buffer, &fcprsp->rspInfo0 + rsplen, snslen);
        }

        cmnd->resid = 0;
        if (resp_info & RESID_UNDER) {
                cmnd->resid = be32_to_cpu(fcprsp->rspResId);

                lpfc_printf_log(phba, KERN_INFO, LOG_FCP,
                                "%d:0716 FCP Read Underrun, expected %d, "
                                "residual %d Data: x%x x%x x%x\n", phba->brd_no,
                                be32_to_cpu(fcpcmd->fcpDl), cmnd->resid,
                                fcpi_parm, cmnd->cmnd[0], cmnd->underflow);

                /*
                 * The cmnd->underflow is the minimum number of bytes that must
                 * be transfered for this command.  Provided a sense condition
                 * is not present, make sure the actual amount transferred is at
                 * least the underflow value or fail.
                 */
                if (!(resp_info & SNS_LEN_VALID) &&
                    (scsi_status == SAM_STAT_GOOD) &&
                    (cmnd->request_bufflen - cmnd->resid) < cmnd->underflow) {
                        lpfc_printf_log(phba, KERN_INFO, LOG_FCP,
                                        "%d:0717 FCP command x%x residual "
                                        "underrun converted to error "
                                        "Data: x%x x%x x%x\n", phba->brd_no,
                                        cmnd->cmnd[0], cmnd->request_bufflen,
                                        cmnd->resid, cmnd->underflow);

                        host_status = DID_ERROR;
                }
        } else if (resp_info & RESID_OVER) {
                lpfc_printf_log(phba, KERN_WARNING, LOG_FCP,
                                "%d:0720 FCP command x%x residual "
                                "overrun error. Data: x%x x%x \n",
                                phba->brd_no, cmnd->cmnd[0],
                                cmnd->request_bufflen, cmnd->resid);
                host_status = DID_ERROR;

        /*
         * Check SLI validation that all the transfer was actually done
         * (fcpi_parm should be zero). Apply check only to reads.
         */
        } else if ((scsi_status == SAM_STAT_GOOD) && fcpi_parm &&
                        (cmnd->sc_data_direction == DMA_FROM_DEVICE)) {
                lpfc_printf_log(phba, KERN_WARNING, LOG_FCP,
                        "%d:0734 FCP Read Check Error Data: "
                        "x%x x%x x%x x%x\n", phba->brd_no,
                        be32_to_cpu(fcpcmd->fcpDl),
                        be32_to_cpu(fcprsp->rspResId),
                        fcpi_parm, cmnd->cmnd[0]);
                host_status = DID_ERROR;
                cmnd->resid = cmnd->request_bufflen;
        }

 out:
        cmnd->result = ScsiResult(host_status, scsi_status);
}

static void
lpfc_scsi_cmd_iocb_cmpl(struct lpfc_hba *phba, struct lpfc_iocbq *pIocbIn,
                        struct lpfc_iocbq *pIocbOut)
{
        struct lpfc_scsi_buf *lpfc_cmd =
                (struct lpfc_scsi_buf *) pIocbIn->context1;
        struct lpfc_rport_data *rdata = lpfc_cmd->rdata;
        struct lpfc_nodelist *pnode = rdata->pnode;
        struct scsi_cmnd *cmd = lpfc_cmd->pCmd;
        unsigned long iflag;

        lpfc_cmd->result = pIocbOut->iocb.un.ulpWord[4];
        lpfc_cmd->status = pIocbOut->iocb.ulpStatus;

        if (lpfc_cmd->status) {
                if (lpfc_cmd->status == IOSTAT_LOCAL_REJECT &&
                    (lpfc_cmd->result & IOERR_DRVR_MASK))
                        lpfc_cmd->status = IOSTAT_DRIVER_REJECT;
                else if (lpfc_cmd->status >= IOSTAT_CNT)
                        lpfc_cmd->status = IOSTAT_DEFAULT;

                lpfc_printf_log(phba, KERN_WARNING, LOG_FCP,
                                "%d:0729 FCP cmd x%x failed <%d/%d> status: "
                                "x%x result: x%x Data: x%x x%x\n",
                                phba->brd_no, cmd->cmnd[0], cmd->device->id,
                                cmd->device->lun, lpfc_cmd->status,
                                lpfc_cmd->result, pIocbOut->iocb.ulpContext,
                                lpfc_cmd->cur_iocbq.iocb.ulpIoTag);

                switch (lpfc_cmd->status) {
                case IOSTAT_FCP_RSP_ERROR:
                        /* Call FCP RSP handler to determine result */
                        lpfc_handle_fcp_err(lpfc_cmd);
                        break;
                case IOSTAT_NPORT_BSY:
                case IOSTAT_FABRIC_BSY:
                        cmd->result = ScsiResult(DID_BUS_BUSY, 0);
                        break;
                default:
                        cmd->result = ScsiResult(DID_ERROR, 0);
                        break;
                }

                if ((pnode == NULL )
                    || (pnode->nlp_state != NLP_STE_MAPPED_NODE))
                        cmd->result = ScsiResult(DID_BUS_BUSY, SAM_STAT_BUSY);
        } else {
                cmd->result = ScsiResult(DID_OK, 0);
        }

        if (cmd->result || lpfc_cmd->fcp_rsp->rspSnsLen) {
                uint32_t *lp = (uint32_t *)cmd->sense_buffer;

                lpfc_printf_log(phba, KERN_INFO, LOG_FCP,
                                "%d:0710 Iodone <%d/%d> cmd %p, error x%x "
                                "SNS x%x x%x Data: x%x x%x\n",
                                phba->brd_no, cmd->device->id,
                                cmd->device->lun, cmd, cmd->result,
                                *lp, *(lp + 3), cmd->retries, cmd->resid);
        }

        cmd->scsi_done(cmd);

        spin_lock_irqsave(phba->host->host_lock, iflag);
        lpfc_release_scsi_buf(phba, lpfc_cmd);
        spin_unlock_irqrestore(phba->host->host_lock, iflag);
}

static void
lpfc_scsi_prep_cmnd(struct lpfc_hba * phba, struct lpfc_scsi_buf * lpfc_cmd,
                        struct lpfc_nodelist *pnode)
{
        struct scsi_cmnd *scsi_cmnd = lpfc_cmd->pCmd;
        struct fcp_cmnd *fcp_cmnd = lpfc_cmd->fcp_cmnd;
        IOCB_t *iocb_cmd = &lpfc_cmd->cur_iocbq.iocb;
        struct lpfc_iocbq *piocbq = &(lpfc_cmd->cur_iocbq);
        int datadir = scsi_cmnd->sc_data_direction;

        lpfc_cmd->fcp_rsp->rspSnsLen = 0;
        /* clear task management bits */
        lpfc_cmd->fcp_cmnd->fcpCntl2 = 0;

        int_to_scsilun(lpfc_cmd->pCmd->device->lun,
                        &lpfc_cmd->fcp_cmnd->fcp_lun);

        memcpy(&fcp_cmnd->fcpCdb[0], scsi_cmnd->cmnd, 16);

        if (scsi_cmnd->device->tagged_supported) {
                switch (scsi_cmnd->tag) {
                case HEAD_OF_QUEUE_TAG:
                        fcp_cmnd->fcpCntl1 = HEAD_OF_Q;
                        break;
                case ORDERED_QUEUE_TAG:
                        fcp_cmnd->fcpCntl1 = ORDERED_Q;
                        break;
                default:
                        fcp_cmnd->fcpCntl1 = SIMPLE_Q;
                        break;
                }
        } else
                fcp_cmnd->fcpCntl1 = 0;

        /*
         * There are three possibilities here - use scatter-gather segment, use
         * the single mapping, or neither.  Start the lpfc command prep by
         * 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 (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 {
                iocb_cmd->ulpCommand = CMD_FCP_ICMND64_CR;
                iocb_cmd->un.fcpi.fcpi_parm = 0;
                iocb_cmd->ulpPU = 0;
                fcp_cmnd->fcpCntl3 = 0;
                phba->fc4ControlRequests++;
        }

        /*
         * Finish initializing those IOCB fields that are independent
         * of the scsi_cmnd request_buffer
         */
        piocbq->iocb.ulpContext = pnode->nlp_rpi;
        if (pnode->nlp_fcp_info & NLP_FCP_2_DEVICE)
                piocbq->iocb.ulpFCP2Rcvy = 1;

        piocbq->iocb.ulpClass = (pnode->nlp_fcp_info & 0x0f);
        piocbq->context1  = lpfc_cmd;
        piocbq->iocb_cmpl = lpfc_scsi_cmd_iocb_cmpl;
        piocbq->iocb.ulpTimeout = lpfc_cmd->timeout;
}

static int
lpfc_scsi_prep_task_mgmt_cmd(struct lpfc_hba *phba,
                             struct lpfc_scsi_buf *lpfc_cmd,
                             uint8_t task_mgmt_cmd)
{
        struct lpfc_sli *psli;
        struct lpfc_iocbq *piocbq;
        IOCB_t *piocb;
        struct fcp_cmnd *fcp_cmnd;
        struct scsi_device *scsi_dev = lpfc_cmd->pCmd->device;
        struct lpfc_rport_data *rdata = scsi_dev->hostdata;
        struct lpfc_nodelist *ndlp = rdata->pnode;

        if ((ndlp == NULL) || (ndlp->nlp_state != NLP_STE_MAPPED_NODE)) {
                return 0;
        }

        psli = &phba->sli;
        piocbq = &(lpfc_cmd->cur_iocbq);
        piocb = &piocbq->iocb;

        fcp_cmnd = lpfc_cmd->fcp_cmnd;
        int_to_scsilun(lpfc_cmd->pCmd->device->lun,
                        &lpfc_cmd->fcp_cmnd->fcp_lun);
        fcp_cmnd->fcpCntl2 = task_mgmt_cmd;

        piocb->ulpCommand = CMD_FCP_ICMND64_CR;

        piocb->ulpContext = ndlp->nlp_rpi;
        if (ndlp->nlp_fcp_info & NLP_FCP_2_DEVICE) {
                piocb->ulpFCP2Rcvy = 1;
        }
        piocb->ulpClass = (ndlp->nlp_fcp_info & 0x0f);

        /* ulpTimeout is only one byte */
        if (lpfc_cmd->timeout > 0xff) {
                /*
                 * Do not timeout the command at the firmware level.
                 * The driver will provide the timeout mechanism.
                 */
                piocb->ulpTimeout = 0;
        } else {
                piocb->ulpTimeout = lpfc_cmd->timeout;
        }

        lpfc_cmd->rdata = rdata;

        switch (task_mgmt_cmd) {
        case FCP_LUN_RESET:
                /* Issue LUN Reset to TGT <num> LUN <num> */
                lpfc_printf_log(phba,
                                KERN_INFO,
                                LOG_FCP,
                                "%d:0703 Issue LUN Reset to TGT %d LUN %d "
                                "Data: x%x x%x\n",
                                phba->brd_no,
                                scsi_dev->id, scsi_dev->lun,
                                ndlp->nlp_rpi, ndlp->nlp_flag);

                break;
        case FCP_ABORT_TASK_SET:
                /* Issue Abort Task Set to TGT <num> LUN <num> */
                lpfc_printf_log(phba,
                                KERN_INFO,
                                LOG_FCP,
                                "%d:0701 Issue Abort Task Set to TGT %d LUN %d "
                                "Data: x%x x%x\n",
                                phba->brd_no,
                                scsi_dev->id, scsi_dev->lun,
                                ndlp->nlp_rpi, ndlp->nlp_flag);

                break;
        case FCP_TARGET_RESET:
                /* Issue Target Reset to TGT <num> */
                lpfc_printf_log(phba,
                                KERN_INFO,
                                LOG_FCP,
                                "%d:0702 Issue Target Reset to TGT %d "
                                "Data: x%x x%x\n",
                                phba->brd_no,
                                scsi_dev->id, ndlp->nlp_rpi,
                                ndlp->nlp_flag);
                break;
        }

        return (1);
}

static int
lpfc_scsi_tgt_reset(struct lpfc_scsi_buf * lpfc_cmd, struct lpfc_hba * phba)
{
        struct lpfc_iocbq *iocbq;
        struct lpfc_iocbq *iocbqrsp;
        int ret;

        ret = lpfc_scsi_prep_task_mgmt_cmd(phba, lpfc_cmd, FCP_TARGET_RESET);
        if (!ret)
                return FAILED;

        lpfc_cmd->scsi_hba = phba;
        iocbq = &lpfc_cmd->cur_iocbq;
        iocbqrsp = lpfc_sli_get_iocbq(phba);

        if (!iocbqrsp)
                return FAILED;

        ret = lpfc_sli_issue_iocb_wait(phba,
                                       &phba->sli.ring[phba->sli.fcp_ring],
                                       iocbq, iocbqrsp, lpfc_cmd->timeout);
        if (ret != IOCB_SUCCESS) {
                lpfc_cmd->status = IOSTAT_DRIVER_REJECT;
                ret = FAILED;
        } else {
                ret = SUCCESS;
                lpfc_cmd->result = iocbqrsp->iocb.un.ulpWord[4];
                lpfc_cmd->status = iocbqrsp->iocb.ulpStatus;
                if (lpfc_cmd->status == IOSTAT_LOCAL_REJECT &&
                        (lpfc_cmd->result & IOERR_DRVR_MASK))
                                lpfc_cmd->status = IOSTAT_DRIVER_REJECT;
        }

        lpfc_sli_release_iocbq(phba, iocbqrsp);
        return ret;
}

const char *
lpfc_info(struct Scsi_Host *host)
{
        struct lpfc_hba    *phba = (struct lpfc_hba *) host->hostdata[0];
        int len;
        static char  lpfcinfobuf[384];

        memset(lpfcinfobuf,0,384);
        if (phba && phba->pcidev){
                strncpy(lpfcinfobuf, phba->ModelDesc, 256);
                len = strlen(lpfcinfobuf);
                snprintf(lpfcinfobuf + len,
                        384-len,
                        " on PCI bus %02x device %02x irq %d",
                        phba->pcidev->bus->number,
                        phba->pcidev->devfn,
                        phba->pcidev->irq);
                len = strlen(lpfcinfobuf);
                if (phba->Port[0]) {
                        snprintf(lpfcinfobuf + len,
                                 384-len,
                                 " port %s",
                                 phba->Port);
                }
        }
        return lpfcinfobuf;
}

static int
lpfc_queuecommand(struct scsi_cmnd *cmnd, void (*done) (struct scsi_cmnd *))
{
        struct lpfc_hba *phba =
                (struct lpfc_hba *) cmnd->device->host->hostdata[0];
        struct lpfc_sli *psli = &phba->sli;
        struct lpfc_rport_data *rdata = cmnd->device->hostdata;
        struct lpfc_nodelist *ndlp = rdata->pnode;
        struct lpfc_scsi_buf *lpfc_cmd;
        struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device));
        int err;

        err = fc_remote_port_chkready(rport);
        if (err) {
                cmnd->result = err;
                goto out_fail_command;
        }

        /*
         * Catch race where our node has transitioned, but the
         * transport is still transitioning.
         */
        if (!ndlp) {
                cmnd->result = ScsiResult(DID_BUS_BUSY, 0);
                goto out_fail_command;
        }
        lpfc_cmd = lpfc_sli_get_scsi_buf (phba);
        if (lpfc_cmd == NULL) {
                lpfc_printf_log(phba, KERN_INFO, LOG_FCP,
                                "%d:0707 driver's buffer pool is empty, "
                                "IO busied\n", phba->brd_no);
                goto out_host_busy;
        }

        /*
         * Store the midlayer's command structure for the completion phase
         * and complete the command initialization.
         */
        lpfc_cmd->pCmd  = cmnd;
        lpfc_cmd->rdata = rdata;
        lpfc_cmd->timeout = 0;
        cmnd->host_scribble = (unsigned char *)lpfc_cmd;
        cmnd->scsi_done = done;

        err = lpfc_scsi_prep_dma_buf(phba, lpfc_cmd);
        if (err)
                goto out_host_busy_free_buf;

        lpfc_scsi_prep_cmnd(phba, lpfc_cmd, ndlp);

        err = lpfc_sli_issue_iocb(phba, &phba->sli.ring[psli->fcp_ring],
                                &lpfc_cmd->cur_iocbq, SLI_IOCB_RET_IOCB);
        if (err)
                goto out_host_busy_free_buf;
        return 0;

 out_host_busy_free_buf:
        lpfc_release_scsi_buf(phba, lpfc_cmd);
        cmnd->host_scribble = NULL;
 out_host_busy:
        return SCSI_MLQUEUE_HOST_BUSY;

 out_fail_command:
        done(cmnd);
        return 0;
}

static int
__lpfc_abort_handler(struct scsi_cmnd *cmnd)
{
        struct lpfc_hba *phba =
                        (struct lpfc_hba *)cmnd->device->host->hostdata[0];
        struct lpfc_sli_ring *pring = &phba->sli.ring[phba->sli.fcp_ring];
        struct lpfc_iocbq *iocb;
        struct lpfc_iocbq *abtsiocb;
        struct lpfc_scsi_buf *lpfc_cmd;
        IOCB_t *cmd, *icmd;
        unsigned int loop_count = 0;
        int ret = SUCCESS;


        lpfc_cmd = (struct lpfc_scsi_buf *)cmnd->host_scribble;
        BUG_ON(!lpfc_cmd);

        /*
         * If pCmd field of the corresponding lpfc_scsi_buf structure
         * points to a different SCSI command, then the driver has
         * already completed this command, but the midlayer did not
         * see the completion before the eh fired.  Just return
         * SUCCESS.
         */
        iocb = &lpfc_cmd->cur_iocbq;
        if (lpfc_cmd->pCmd != cmnd)
                goto out;

        BUG_ON(iocb->context1 != lpfc_cmd);

        abtsiocb = lpfc_sli_get_iocbq(phba);
        if (abtsiocb == NULL) {
                ret = FAILED;
                goto out;
        }

        /*
         * The scsi command can not be in txq and it is in flight because the
         * pCmd is still pointig at the SCSI command we have to abort. There
         * is no need to search the txcmplq. Just send an abort to the FW.
         */

        cmd = &iocb->iocb;
        icmd = &abtsiocb->iocb;
        icmd->un.acxri.abortType = ABORT_TYPE_ABTS;
        icmd->un.acxri.abortContextTag = cmd->ulpContext;
        icmd->un.acxri.abortIoTag = cmd->ulpIoTag;

        icmd->ulpLe = 1;
        icmd->ulpClass = cmd->ulpClass;
        if (phba->hba_state >= LPFC_LINK_UP)
                icmd->ulpCommand = CMD_ABORT_XRI_CN;
        else
                icmd->ulpCommand = CMD_CLOSE_XRI_CN;

        abtsiocb->iocb_cmpl = lpfc_sli_abort_fcp_cmpl;
        if (lpfc_sli_issue_iocb(phba, pring, abtsiocb, 0) == IOCB_ERROR) {
                lpfc_sli_release_iocbq(phba, abtsiocb);
                ret = FAILED;
                goto out;
        }

        /* Wait for abort to complete */
        while (lpfc_cmd->pCmd == cmnd)
        {
                spin_unlock_irq(phba->host->host_lock);
                        schedule_timeout_uninterruptible(LPFC_ABORT_WAIT*HZ);
                spin_lock_irq(phba->host->host_lock);
                if (++loop_count
                    > (2 * phba->cfg_nodev_tmo)/LPFC_ABORT_WAIT)
                        break;
        }

        if (lpfc_cmd->pCmd == cmnd) {
                ret = FAILED;
                lpfc_printf_log(phba, KERN_ERR, LOG_FCP,
                                "%d:0748 abort handler timed out waiting for "
                                "abort to complete: ret %#x, ID %d, LUN %d, "
                                "snum %#lx\n",
                                phba->brd_no,  ret, cmnd->device->id,
                                cmnd->device->lun, cmnd->serial_number);
        }

 out:
        lpfc_printf_log(phba, KERN_WARNING, LOG_FCP,
                        "%d:0749 SCSI Layer I/O Abort Request "
                        "Status x%x ID %d LUN %d snum %#lx\n",
                        phba->brd_no, ret, cmnd->device->id,
                        cmnd->device->lun, cmnd->serial_number);

        return ret;
}

static int
lpfc_abort_handler(struct scsi_cmnd *cmnd)
{
        int rc;
        spin_lock_irq(cmnd->device->host->host_lock);
        rc = __lpfc_abort_handler(cmnd);
        spin_unlock_irq(cmnd->device->host->host_lock);
        return rc;
}

static int
__lpfc_reset_lun_handler(struct scsi_cmnd *cmnd)
{
        struct Scsi_Host *shost = cmnd->device->host;
        struct lpfc_hba *phba = (struct lpfc_hba *)shost->hostdata[0];
        struct lpfc_scsi_buf *lpfc_cmd;
        struct lpfc_iocbq *iocbq, *iocbqrsp;
        struct lpfc_rport_data *rdata = cmnd->device->hostdata;
        struct lpfc_nodelist *pnode = rdata->pnode;
        int ret = FAILED;
        int cnt, loopcnt;

        /*
         * If target is not in a MAPPED state, delay the reset until
         * target is rediscovered or nodev timeout expires.
         */
        while ( 1 ) {
                if (!pnode)
                        break;

                if (pnode->nlp_state != NLP_STE_MAPPED_NODE) {
                        spin_unlock_irq(phba->host->host_lock);
                        schedule_timeout_uninterruptible(msecs_to_jiffies(500));
                        spin_lock_irq(phba->host->host_lock);
                }
                if ((pnode) && (pnode->nlp_state == NLP_STE_MAPPED_NODE))
                        break;
        }

        lpfc_cmd = lpfc_sli_get_scsi_buf (phba);
        if (lpfc_cmd == NULL)
                goto out;

        lpfc_cmd->pCmd = cmnd;
        lpfc_cmd->timeout = 60;
        lpfc_cmd->scsi_hba = phba;

        ret = lpfc_scsi_prep_task_mgmt_cmd(phba, lpfc_cmd, FCP_LUN_RESET);
        if (!ret)
                goto out_free_scsi_buf;

        iocbq = &lpfc_cmd->cur_iocbq;

        /* get a buffer for this IOCB command response */
        iocbqrsp = lpfc_sli_get_iocbq(phba);
        if (iocbqrsp == NULL)
                goto out_free_scsi_buf;

        ret = lpfc_sli_issue_iocb_wait(phba,
                                       &phba->sli.ring[phba->sli.fcp_ring],
                                       iocbq, iocbqrsp, lpfc_cmd->timeout);
        if (ret == IOCB_SUCCESS)
                ret = SUCCESS;

        lpfc_cmd->result = iocbqrsp->iocb.un.ulpWord[4];
        lpfc_cmd->status = iocbqrsp->iocb.ulpStatus;
        if (lpfc_cmd->status == IOSTAT_LOCAL_REJECT)
                if (lpfc_cmd->result & IOERR_DRVR_MASK)
                        lpfc_cmd->status = IOSTAT_DRIVER_REJECT;

        /*
         * All outstanding txcmplq I/Os should have been aborted by the target.
         * Unfortunately, some targets do not abide by this forcing the driver
         * to double check.
         */
        lpfc_sli_abort_iocb(phba, &phba->sli.ring[phba->sli.fcp_ring],
                            cmnd->device->id, cmnd->device->lun, 0,
                            LPFC_CTX_LUN);

        loopcnt = 0;
        while((cnt = lpfc_sli_sum_iocb(phba,
                                       &phba->sli.ring[phba->sli.fcp_ring],
                                       cmnd->device->id, cmnd->device->lun,
                                       LPFC_CTX_LUN))) {
                spin_unlock_irq(phba->host->host_lock);
                schedule_timeout_uninterruptible(LPFC_RESET_WAIT*HZ);
                spin_lock_irq(phba->host->host_lock);

                if (++loopcnt
                    > (2 * phba->cfg_nodev_tmo)/LPFC_RESET_WAIT)
                        break;
        }

        if (cnt) {
                lpfc_printf_log(phba, KERN_ERR, LOG_FCP,
                        "%d:0719 LUN Reset I/O flush failure: cnt x%x\n",
                        phba->brd_no, cnt);
                ret = FAILED;
        }

        lpfc_sli_release_iocbq(phba, iocbqrsp);

out_free_scsi_buf:
        lpfc_printf_log(phba, KERN_ERR, LOG_FCP,
                        "%d:0713 SCSI layer issued LUN reset (%d, %d) "
                        "Data: x%x x%x x%x\n",
                        phba->brd_no, lpfc_cmd->pCmd->device->id,
                        lpfc_cmd->pCmd->device->lun, ret, lpfc_cmd->status,
                        lpfc_cmd->result);
        lpfc_release_scsi_buf(phba, lpfc_cmd);
out:
        return ret;
}

static int
lpfc_reset_lun_handler(struct scsi_cmnd *cmnd)
{
        int rc;
        spin_lock_irq(cmnd->device->host->host_lock);
        rc = __lpfc_reset_lun_handler(cmnd);
        spin_unlock_irq(cmnd->device->host->host_lock);
        return rc;
}

/*
 * Note: midlayer calls this function with the host_lock held
 */
static int
__lpfc_reset_bus_handler(struct scsi_cmnd *cmnd)
{
        struct Scsi_Host *shost = cmnd->device->host;
        struct lpfc_hba *phba = (struct lpfc_hba *)shost->hostdata[0];
        struct lpfc_nodelist *ndlp = NULL;
        int match;
        int ret = FAILED, i, err_count = 0;
        int cnt, loopcnt;
        unsigned int midlayer_id = 0;
        struct lpfc_scsi_buf * lpfc_cmd;

        lpfc_cmd = lpfc_sli_get_scsi_buf (phba);
        if (lpfc_cmd == NULL)
                goto out;

        /* The lpfc_cmd storage is reused.  Set all loop invariants. */
        lpfc_cmd->timeout = 60;
        lpfc_cmd->pCmd = cmnd;
        lpfc_cmd->scsi_hba = phba;

        /*
         * Since the driver manages a single bus device, reset all
         * targets known to the driver.  Should any target reset
         * fail, this routine returns failure to the midlayer.
         */
        midlayer_id = cmnd->device->id;
        for (i = 0; i < MAX_FCP_TARGET; i++) {
                /* Search the mapped list for this target ID */
                match = 0;
                list_for_each_entry(ndlp, &phba->fc_nlpmap_list, nlp_listp) {
                        if ((i == ndlp->nlp_sid) && ndlp->rport) {
                                match = 1;
                                break;
                        }
                }
                if (!match)
                        continue;

                lpfc_cmd->pCmd->device->id = i;
                lpfc_cmd->pCmd->device->hostdata = ndlp->rport->dd_data;
                ret = lpfc_scsi_tgt_reset(lpfc_cmd, phba);
                if (ret != SUCCESS) {
                        lpfc_printf_log(phba, KERN_INFO, LOG_FCP,
                                "%d:0713 Bus Reset on target %d failed\n",
                                phba->brd_no, i);
                        err_count++;
                }
        }

        cmnd->device->id = midlayer_id;
        loopcnt = 0;
        while((cnt = lpfc_sli_sum_iocb(phba,
                                &phba->sli.ring[phba->sli.fcp_ring],
                                0, 0, LPFC_CTX_HOST))) {
                spin_unlock_irq(phba->host->host_lock);
                schedule_timeout_uninterruptible(LPFC_RESET_WAIT*HZ);
                spin_lock_irq(phba->host->host_lock);

                if (++loopcnt
                    > (2 * phba->cfg_nodev_tmo)/LPFC_RESET_WAIT)
                        break;
        }

        if (cnt) {
                /* flush all outstanding commands on the host */
                i = lpfc_sli_abort_iocb(phba,
                                &phba->sli.ring[phba->sli.fcp_ring], 0, 0, 0,
                                LPFC_CTX_HOST);

                lpfc_printf_log(phba, KERN_INFO, LOG_FCP,
                   "%d:0715 Bus Reset I/O flush failure: cnt x%x left x%x\n",
                   phba->brd_no, cnt, i);
        }

        if (cnt == 0)
                ret = SUCCESS;
        else
                ret = FAILED;

        lpfc_release_scsi_buf(phba, lpfc_cmd);
        lpfc_printf_log(phba,
                        KERN_ERR,
                        LOG_FCP,
                        "%d:0714 SCSI layer issued Bus Reset Data: x%x\n",
                        phba->brd_no, ret);
out:
        return ret;
}

static int
lpfc_reset_bus_handler(struct scsi_cmnd *cmnd)
{
        int rc;
        spin_lock_irq(cmnd->device->host->host_lock);
        rc = __lpfc_reset_bus_handler(cmnd);
        spin_unlock_irq(cmnd->device->host->host_lock);
        return rc;
}

static int
lpfc_slave_alloc(struct scsi_device *sdev)
{
        struct lpfc_hba *phba = (struct lpfc_hba *)sdev->host->hostdata[0];
        struct lpfc_scsi_buf *scsi_buf = NULL;
        struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
        uint32_t total = 0, i;
        uint32_t num_to_alloc = 0;
        unsigned long flags;

        if (!rport || fc_remote_port_chkready(rport))
                return -ENXIO;

        sdev->hostdata = rport->dd_data;

        /*
         * Populate the cmds_per_lun count scsi_bufs into this host's globally
         * available list of scsi buffers.  Don't allocate more than the
         * HBA limit conveyed to the midlayer via the host structure.  The
         * formula accounts for the lun_queue_depth + error handlers + 1
         * extra.  This list of scsi bufs exists for the lifetime of the driver.
         */
        total = phba->total_scsi_bufs;
        num_to_alloc = phba->cfg_lun_queue_depth + 2;
        if (total >= phba->cfg_hba_queue_depth) {
                lpfc_printf_log(phba, KERN_WARNING, LOG_FCP,
                                "%d:0704 At limitation of %d preallocated "
                                "command buffers\n", phba->brd_no, total);
                return 0;
        } else if (total + num_to_alloc > phba->cfg_hba_queue_depth) {
                lpfc_printf_log(phba, KERN_WARNING, LOG_FCP,
                                "%d:0705 Allocation request of %d command "
                                "buffers will exceed max of %d.  Reducing "
                                "allocation request to %d.\n", phba->brd_no,
                                num_to_alloc, phba->cfg_hba_queue_depth,
                                (phba->cfg_hba_queue_depth - total));
                num_to_alloc = phba->cfg_hba_queue_depth - total;
        }

        for (i = 0; i < num_to_alloc; i++) {
                scsi_buf = lpfc_new_scsi_buf(phba);
                if (!scsi_buf) {
                        lpfc_printf_log(phba, KERN_ERR, LOG_FCP,
                                        "%d:0706 Failed to allocate command "
                                        "buffer\n", phba->brd_no);
                        break;
                }

                spin_lock_irqsave(phba->host->host_lock, flags);
                phba->total_scsi_bufs++;
                list_add_tail(&scsi_buf->list, &phba->lpfc_scsi_buf_list);
                spin_unlock_irqrestore(phba->host->host_lock, flags);
        }
        return 0;
}

static int
lpfc_slave_configure(struct scsi_device *sdev)
{
        struct lpfc_hba *phba = (struct lpfc_hba *) sdev->host->hostdata[0];
        struct fc_rport *rport = starget_to_rport(sdev->sdev_target);

        if (sdev->tagged_supported)
                scsi_activate_tcq(sdev, phba->cfg_lun_queue_depth);
        else
                scsi_deactivate_tcq(sdev, phba->cfg_lun_queue_depth);

        /*
         * Initialize the fc transport attributes for the target
         * containing this scsi device.  Also note that the driver's
         * target pointer is stored in the starget_data for the
         * driver's sysfs entry point functions.
         */
        rport->dev_loss_tmo = phba->cfg_nodev_tmo + 5;

        return 0;
}

static void
lpfc_slave_destroy(struct scsi_device *sdev)
{
        sdev->hostdata = NULL;
        return;
}

struct scsi_host_template lpfc_template = {
        .module                 = THIS_MODULE,
        .name                   = LPFC_DRIVER_NAME,
        .info                   = lpfc_info,
        .queuecommand           = lpfc_queuecommand,
        .eh_abort_handler       = lpfc_abort_handler,
        .eh_device_reset_handler= lpfc_reset_lun_handler,
        .eh_bus_reset_handler   = lpfc_reset_bus_handler,
        .slave_alloc            = lpfc_slave_alloc,
        .slave_configure        = lpfc_slave_configure,
        .slave_destroy          = lpfc_slave_destroy,
        .this_id                = -1,
        .sg_tablesize           = LPFC_SG_SEG_CNT,
        .cmd_per_lun            = LPFC_CMD_PER_LUN,
        .use_clustering         = ENABLE_CLUSTERING,
        .shost_attrs            = lpfc_host_attrs,
        .max_sectors            = 0xFFFF,
};