/*******************************************************************
 * This file is part of the Emulex Linux Device Driver for         *
 * Fibre Channel Host Bus Adapters.                                *
 * Copyright (C) 2009-2015 Emulex.  All rights reserved.           *
 * EMULEX and SLI are trademarks of Emulex.                        *
 * www.emulex.com                                                  *
 *                                                                 *
 * 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/interrupt.h>
#include <linux/mempool.h>
#include <linux/pci.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/list.h>

#include <scsi/scsi.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_transport_fc.h>
#include <scsi/scsi_bsg_fc.h>
#include <scsi/fc/fc_fs.h>

#include "lpfc_hw4.h"
#include "lpfc_hw.h"
#include "lpfc_sli.h"
#include "lpfc_sli4.h"
#include "lpfc_nl.h"
#include "lpfc_bsg.h"
#include "lpfc_disc.h"
#include "lpfc_scsi.h"
#include "lpfc.h"
#include "lpfc_logmsg.h"
#include "lpfc_crtn.h"
#include "lpfc_debugfs.h"
#include "lpfc_vport.h"
#include "lpfc_version.h"

struct lpfc_bsg_event {
        struct list_head node;
        struct kref kref;
        wait_queue_head_t wq;

        /* Event type and waiter identifiers */
        uint32_t type_mask;
        uint32_t req_id;
        uint32_t reg_id;

        /* next two flags are here for the auto-delete logic */
        unsigned long wait_time_stamp;
        int waiting;

        /* seen and not seen events */
        struct list_head events_to_get;
        struct list_head events_to_see;

        /* driver data associated with the job */
        void *dd_data;
};

struct lpfc_bsg_iocb {
        struct lpfc_iocbq *cmdiocbq;
        struct lpfc_dmabuf *rmp;
        struct lpfc_nodelist *ndlp;
};

struct lpfc_bsg_mbox {
        LPFC_MBOXQ_t *pmboxq;
        MAILBOX_t *mb;
        struct lpfc_dmabuf *dmabuffers; /* for BIU diags */
        uint8_t *ext; /* extended mailbox data */
        uint32_t mbOffset; /* from app */
        uint32_t inExtWLen; /* from app */
        uint32_t outExtWLen; /* from app */
};

#define MENLO_DID 0x0000FC0E

struct lpfc_bsg_menlo {
        struct lpfc_iocbq *cmdiocbq;
        struct lpfc_dmabuf *rmp;
};

#define TYPE_EVT        1
#define TYPE_IOCB       2
#define TYPE_MBOX       3
#define TYPE_MENLO      4
struct bsg_job_data {
        uint32_t type;
        struct fc_bsg_job *set_job; /* job waiting for this iocb to finish */
        union {
                struct lpfc_bsg_event *evt;
                struct lpfc_bsg_iocb iocb;
                struct lpfc_bsg_mbox mbox;
                struct lpfc_bsg_menlo menlo;
        } context_un;
};

struct event_data {
        struct list_head node;
        uint32_t type;
        uint32_t immed_dat;
        void *data;
        uint32_t len;
};

#define BUF_SZ_4K 4096
#define SLI_CT_ELX_LOOPBACK 0x10

enum ELX_LOOPBACK_CMD {
        ELX_LOOPBACK_XRI_SETUP,
        ELX_LOOPBACK_DATA,
};

#define ELX_LOOPBACK_HEADER_SZ \
        (size_t)(&((struct lpfc_sli_ct_request *)NULL)->un)

struct lpfc_dmabufext {
        struct lpfc_dmabuf dma;
        uint32_t size;
        uint32_t flag;
};

static void
lpfc_free_bsg_buffers(struct lpfc_hba *phba, struct lpfc_dmabuf *mlist)
{
        struct lpfc_dmabuf *mlast, *next_mlast;

        if (mlist) {
                list_for_each_entry_safe(mlast, next_mlast, &mlist->list,
                                         list) {
                        lpfc_mbuf_free(phba, mlast->virt, mlast->phys);
                        list_del(&mlast->list);
                        kfree(mlast);
                }
                lpfc_mbuf_free(phba, mlist->virt, mlist->phys);
                kfree(mlist);
        }
        return;
}

static struct lpfc_dmabuf *
lpfc_alloc_bsg_buffers(struct lpfc_hba *phba, unsigned int size,
                       int outbound_buffers, struct ulp_bde64 *bpl,
                       int *bpl_entries)
{
        struct lpfc_dmabuf *mlist = NULL;
        struct lpfc_dmabuf *mp;
        unsigned int bytes_left = size;

        /* Verify we can support the size specified */
        if (!size || (size > (*bpl_entries * LPFC_BPL_SIZE)))
                return NULL;

        /* Determine the number of dma buffers to allocate */
        *bpl_entries = (size % LPFC_BPL_SIZE ? size/LPFC_BPL_SIZE + 1 :
                        size/LPFC_BPL_SIZE);

        /* Allocate dma buffer and place in BPL passed */
        while (bytes_left) {
                /* Allocate dma buffer  */
                mp = kmalloc(sizeof(struct lpfc_dmabuf), GFP_KERNEL);
                if (!mp) {
                        if (mlist)
                                lpfc_free_bsg_buffers(phba, mlist);
                        return NULL;
                }

                INIT_LIST_HEAD(&mp->list);
                mp->virt = lpfc_mbuf_alloc(phba, MEM_PRI, &(mp->phys));

                if (!mp->virt) {
                        kfree(mp);
                        if (mlist)
                                lpfc_free_bsg_buffers(phba, mlist);
                        return NULL;
                }

                /* Queue it to a linked list */
                if (!mlist)
                        mlist = mp;
                else
                        list_add_tail(&mp->list, &mlist->list);

                /* Add buffer to buffer pointer list */
                if (outbound_buffers)
                        bpl->tus.f.bdeFlags = BUFF_TYPE_BDE_64;
                else
                        bpl->tus.f.bdeFlags = BUFF_TYPE_BDE_64I;
                bpl->addrLow = le32_to_cpu(putPaddrLow(mp->phys));
                bpl->addrHigh = le32_to_cpu(putPaddrHigh(mp->phys));
                bpl->tus.f.bdeSize = (uint16_t)
                        (bytes_left >= LPFC_BPL_SIZE ? LPFC_BPL_SIZE :
                         bytes_left);
                bytes_left -= bpl->tus.f.bdeSize;
                bpl->tus.w = le32_to_cpu(bpl->tus.w);
                bpl++;
        }
        return mlist;
}

static unsigned int
lpfc_bsg_copy_data(struct lpfc_dmabuf *dma_buffers,
                   struct fc_bsg_buffer *bsg_buffers,
                   unsigned int bytes_to_transfer, int to_buffers)
{

        struct lpfc_dmabuf *mp;
        unsigned int transfer_bytes, bytes_copied = 0;
        unsigned int sg_offset, dma_offset;
        unsigned char *dma_address, *sg_address;
        LIST_HEAD(temp_list);
        struct sg_mapping_iter miter;
        unsigned long flags;
        unsigned int sg_flags = SG_MITER_ATOMIC;
        bool sg_valid;

        list_splice_init(&dma_buffers->list, &temp_list);
        list_add(&dma_buffers->list, &temp_list);
        sg_offset = 0;
        if (to_buffers)
                sg_flags |= SG_MITER_FROM_SG;
        else
                sg_flags |= SG_MITER_TO_SG;
        sg_miter_start(&miter, bsg_buffers->sg_list, bsg_buffers->sg_cnt,
                       sg_flags);
        local_irq_save(flags);
        sg_valid = sg_miter_next(&miter);
        list_for_each_entry(mp, &temp_list, list) {
                dma_offset = 0;
                while (bytes_to_transfer && sg_valid &&
                       (dma_offset < LPFC_BPL_SIZE)) {
                        dma_address = mp->virt + dma_offset;
                        if (sg_offset) {
                                /* Continue previous partial transfer of sg */
                                sg_address = miter.addr + sg_offset;
                                transfer_bytes = miter.length - sg_offset;
                        } else {
                                sg_address = miter.addr;
                                transfer_bytes = miter.length;
                        }
                        if (bytes_to_transfer < transfer_bytes)
                                transfer_bytes = bytes_to_transfer;
                        if (transfer_bytes > (LPFC_BPL_SIZE - dma_offset))
                                transfer_bytes = LPFC_BPL_SIZE - dma_offset;
                        if (to_buffers)
                                memcpy(dma_address, sg_address, transfer_bytes);
                        else
                                memcpy(sg_address, dma_address, transfer_bytes);
                        dma_offset += transfer_bytes;
                        sg_offset += transfer_bytes;
                        bytes_to_transfer -= transfer_bytes;
                        bytes_copied += transfer_bytes;
                        if (sg_offset >= miter.length) {
                                sg_offset = 0;
                                sg_valid = sg_miter_next(&miter);
                        }
                }
        }
        sg_miter_stop(&miter);
        local_irq_restore(flags);
        list_del_init(&dma_buffers->list);
        list_splice(&temp_list, &dma_buffers->list);
        return bytes_copied;
}

/**
 * lpfc_bsg_send_mgmt_cmd_cmp - lpfc_bsg_send_mgmt_cmd's completion handler
 * @phba: Pointer to HBA context object.
 * @cmdiocbq: Pointer to command iocb.
 * @rspiocbq: Pointer to response iocb.
 *
 * This function is the completion handler for iocbs issued using
 * lpfc_bsg_send_mgmt_cmd function. This function is called by the
 * ring event handler function without any lock held. This function
 * can be called from both worker thread context and interrupt
 * context. This function also can be called from another thread which
 * cleans up the SLI layer objects.
 * This function copies the contents of the response iocb to the
 * response iocb memory object provided by the caller of
 * lpfc_sli_issue_iocb_wait and then wakes up the thread which
 * sleeps for the iocb completion.
 **/
static void
lpfc_bsg_send_mgmt_cmd_cmp(struct lpfc_hba *phba,
                        struct lpfc_iocbq *cmdiocbq,
                        struct lpfc_iocbq *rspiocbq)
{
        struct bsg_job_data *dd_data;
        struct fc_bsg_job *job;
        IOCB_t *rsp;
        struct lpfc_dmabuf *bmp, *cmp, *rmp;
        struct lpfc_nodelist *ndlp;
        struct lpfc_bsg_iocb *iocb;
        unsigned long flags;
        unsigned int rsp_size;
        int rc = 0;

        dd_data = cmdiocbq->context1;

        /* Determine if job has been aborted */
        spin_lock_irqsave(&phba->ct_ev_lock, flags);
        job = dd_data->set_job;
        if (job) {
                /* Prevent timeout handling from trying to abort job */
                job->dd_data = NULL;
        }
        spin_unlock_irqrestore(&phba->ct_ev_lock, flags);

        /* Close the timeout handler abort window */
        spin_lock_irqsave(&phba->hbalock, flags);
        cmdiocbq->iocb_flag &= ~LPFC_IO_CMD_OUTSTANDING;
        spin_unlock_irqrestore(&phba->hbalock, flags);

        iocb = &dd_data->context_un.iocb;
        ndlp = iocb->ndlp;
        rmp = iocb->rmp;
        cmp = cmdiocbq->context2;
        bmp = cmdiocbq->context3;
        rsp = &rspiocbq->iocb;

        /* Copy the completed data or set the error status */

        if (job) {
                if (rsp->ulpStatus) {
                        if (rsp->ulpStatus == IOSTAT_LOCAL_REJECT) {
                                switch (rsp->un.ulpWord[4] & IOERR_PARAM_MASK) {
                                case IOERR_SEQUENCE_TIMEOUT:
                                        rc = -ETIMEDOUT;
                                        break;
                                case IOERR_INVALID_RPI:
                                        rc = -EFAULT;
                                        break;
                                default:
                                        rc = -EACCES;
                                        break;
                                }
                        } else {
                                rc = -EACCES;
                        }
                } else {
                        rsp_size = rsp->un.genreq64.bdl.bdeSize;
                        job->reply->reply_payload_rcv_len =
                                lpfc_bsg_copy_data(rmp, &job->reply_payload,
                                                   rsp_size, 0);
                }
        }

        lpfc_free_bsg_buffers(phba, cmp);
        lpfc_free_bsg_buffers(phba, rmp);
        lpfc_mbuf_free(phba, bmp->virt, bmp->phys);
        kfree(bmp);
        lpfc_sli_release_iocbq(phba, cmdiocbq);
        lpfc_nlp_put(ndlp);
        kfree(dd_data);

        /* Complete the job if the job is still active */

        if (job) {
                job->reply->result = rc;
                job->job_done(job);
        }
        return;
}

/**
 * lpfc_bsg_send_mgmt_cmd - send a CT command from a bsg request
 * @job: fc_bsg_job to handle
 **/
static int
lpfc_bsg_send_mgmt_cmd(struct fc_bsg_job *job)
{
        struct lpfc_vport *vport = (struct lpfc_vport *)job->shost->hostdata;
        struct lpfc_hba *phba = vport->phba;
        struct lpfc_rport_data *rdata = job->rport->dd_data;
        struct lpfc_nodelist *ndlp = rdata->pnode;
        struct ulp_bde64 *bpl = NULL;
        uint32_t timeout;
        struct lpfc_iocbq *cmdiocbq = NULL;
        IOCB_t *cmd;
        struct lpfc_dmabuf *bmp = NULL, *cmp = NULL, *rmp = NULL;
        int request_nseg;
        int reply_nseg;
        struct bsg_job_data *dd_data;
        unsigned long flags;
        uint32_t creg_val;
        int rc = 0;
        int iocb_stat;

        /* in case no data is transferred */
        job->reply->reply_payload_rcv_len = 0;

        /* allocate our bsg tracking structure */
        dd_data = kmalloc(sizeof(struct bsg_job_data), GFP_KERNEL);
        if (!dd_data) {
                lpfc_printf_log(phba, KERN_WARNING, LOG_LIBDFC,
                                "2733 Failed allocation of dd_data\n");
                rc = -ENOMEM;
                goto no_dd_data;
        }

        if (!lpfc_nlp_get(ndlp)) {
                rc = -ENODEV;
                goto no_ndlp;
        }

        if (ndlp->nlp_flag & NLP_ELS_SND_MASK) {
                rc = -ENODEV;
                goto free_ndlp;
        }

        cmdiocbq = lpfc_sli_get_iocbq(phba);
        if (!cmdiocbq) {
                rc = -ENOMEM;
                goto free_ndlp;
        }

        cmd = &cmdiocbq->iocb;

        bmp = kmalloc(sizeof(struct lpfc_dmabuf), GFP_KERNEL);
        if (!bmp) {
                rc = -ENOMEM;
                goto free_cmdiocbq;
        }
        bmp->virt = lpfc_mbuf_alloc(phba, 0, &bmp->phys);
        if (!bmp->virt) {
                rc = -ENOMEM;
                goto free_bmp;
        }

        INIT_LIST_HEAD(&bmp->list);

        bpl = (struct ulp_bde64 *) bmp->virt;
        request_nseg = LPFC_BPL_SIZE/sizeof(struct ulp_bde64);
        cmp = lpfc_alloc_bsg_buffers(phba, job->request_payload.payload_len,
                                     1, bpl, &request_nseg);
        if (!cmp) {
                rc = -ENOMEM;
                goto free_bmp;
        }
        lpfc_bsg_copy_data(cmp, &job->request_payload,
                           job->request_payload.payload_len, 1);

        bpl += request_nseg;
        reply_nseg = LPFC_BPL_SIZE/sizeof(struct ulp_bde64) - request_nseg;
        rmp = lpfc_alloc_bsg_buffers(phba, job->reply_payload.payload_len, 0,
                                     bpl, &reply_nseg);
        if (!rmp) {
                rc = -ENOMEM;
                goto free_cmp;
        }

        cmd->un.genreq64.bdl.ulpIoTag32 = 0;
        cmd->un.genreq64.bdl.addrHigh = putPaddrHigh(bmp->phys);
        cmd->un.genreq64.bdl.addrLow = putPaddrLow(bmp->phys);
        cmd->un.genreq64.bdl.bdeFlags = BUFF_TYPE_BLP_64;
        cmd->un.genreq64.bdl.bdeSize =
                (request_nseg + reply_nseg) * sizeof(struct ulp_bde64);
        cmd->ulpCommand = CMD_GEN_REQUEST64_CR;
        cmd->un.genreq64.w5.hcsw.Fctl = (SI | LA);
        cmd->un.genreq64.w5.hcsw.Dfctl = 0;
        cmd->un.genreq64.w5.hcsw.Rctl = FC_RCTL_DD_UNSOL_CTL;
        cmd->un.genreq64.w5.hcsw.Type = FC_TYPE_CT;
        cmd->ulpBdeCount = 1;
        cmd->ulpLe = 1;
        cmd->ulpClass = CLASS3;
        cmd->ulpContext = ndlp->nlp_rpi;
        if (phba->sli_rev == LPFC_SLI_REV4)
                cmd->ulpContext = phba->sli4_hba.rpi_ids[ndlp->nlp_rpi];
        cmd->ulpOwner = OWN_CHIP;
        cmdiocbq->vport = phba->pport;
        cmdiocbq->context3 = bmp;
        cmdiocbq->iocb_flag |= LPFC_IO_LIBDFC;
        timeout = phba->fc_ratov * 2;
        cmd->ulpTimeout = timeout;

        cmdiocbq->iocb_cmpl = lpfc_bsg_send_mgmt_cmd_cmp;
        cmdiocbq->context1 = dd_data;
        cmdiocbq->context2 = cmp;
        cmdiocbq->context3 = bmp;
        cmdiocbq->context_un.ndlp = ndlp;
        dd_data->type = TYPE_IOCB;
        dd_data->set_job = job;
        dd_data->context_un.iocb.cmdiocbq = cmdiocbq;
        dd_data->context_un.iocb.ndlp = ndlp;
        dd_data->context_un.iocb.rmp = rmp;
        job->dd_data = dd_data;

        if (phba->cfg_poll & DISABLE_FCP_RING_INT) {
                if (lpfc_readl(phba->HCregaddr, &creg_val)) {
                        rc = -EIO ;
                        goto free_rmp;
                }
                creg_val |= (HC_R0INT_ENA << LPFC_FCP_RING);
                writel(creg_val, phba->HCregaddr);
                readl(phba->HCregaddr); /* flush */
        }

        iocb_stat = lpfc_sli_issue_iocb(phba, LPFC_ELS_RING, cmdiocbq, 0);

        if (iocb_stat == IOCB_SUCCESS) {
                spin_lock_irqsave(&phba->hbalock, flags);
                /* make sure the I/O had not been completed yet */
                if (cmdiocbq->iocb_flag & LPFC_IO_LIBDFC) {
                        /* open up abort window to timeout handler */
                        cmdiocbq->iocb_flag |= LPFC_IO_CMD_OUTSTANDING;
                }
                spin_unlock_irqrestore(&phba->hbalock, flags);
                return 0; /* done for now */
        } else if (iocb_stat == IOCB_BUSY) {
                rc = -EAGAIN;
        } else {
                rc = -EIO;
        }

        /* iocb failed so cleanup */
        job->dd_data = NULL;

free_rmp:
        lpfc_free_bsg_buffers(phba, rmp);
free_cmp:
        lpfc_free_bsg_buffers(phba, cmp);
free_bmp:
        if (bmp->virt)
                lpfc_mbuf_free(phba, bmp->virt, bmp->phys);
        kfree(bmp);
free_cmdiocbq:
        lpfc_sli_release_iocbq(phba, cmdiocbq);
free_ndlp:
        lpfc_nlp_put(ndlp);
no_ndlp:
        kfree(dd_data);
no_dd_data:
        /* make error code available to userspace */
        job->reply->result = rc;
        job->dd_data = NULL;
        return rc;
}

/**
 * lpfc_bsg_rport_els_cmp - lpfc_bsg_rport_els's completion handler
 * @phba: Pointer to HBA context object.
 * @cmdiocbq: Pointer to command iocb.
 * @rspiocbq: Pointer to response iocb.
 *
 * This function is the completion handler for iocbs issued using
 * lpfc_bsg_rport_els_cmp function. This function is called by the
 * ring event handler function without any lock held. This function
 * can be called from both worker thread context and interrupt
 * context. This function also can be called from other thread which
 * cleans up the SLI layer objects.
 * This function copies the contents of the response iocb to the
 * response iocb memory object provided by the caller of
 * lpfc_sli_issue_iocb_wait and then wakes up the thread which
 * sleeps for the iocb completion.
 **/
static void
lpfc_bsg_rport_els_cmp(struct lpfc_hba *phba,
                        struct lpfc_iocbq *cmdiocbq,
                        struct lpfc_iocbq *rspiocbq)
{
        struct bsg_job_data *dd_data;
        struct fc_bsg_job *job;
        IOCB_t *rsp;
        struct lpfc_nodelist *ndlp;
        struct lpfc_dmabuf *pcmd = NULL, *prsp = NULL;
        struct fc_bsg_ctels_reply *els_reply;
        uint8_t *rjt_data;
        unsigned long flags;
        unsigned int rsp_size;
        int rc = 0;

        dd_data = cmdiocbq->context1;
        ndlp = dd_data->context_un.iocb.ndlp;
        cmdiocbq->context1 = ndlp;

        /* Determine if job has been aborted */
        spin_lock_irqsave(&phba->ct_ev_lock, flags);
        job = dd_data->set_job;
        if (job) {
                /* Prevent timeout handling from trying to abort job  */
                job->dd_data = NULL;
        }
        spin_unlock_irqrestore(&phba->ct_ev_lock, flags);

        /* Close the timeout handler abort window */
        spin_lock_irqsave(&phba->hbalock, flags);
        cmdiocbq->iocb_flag &= ~LPFC_IO_CMD_OUTSTANDING;
        spin_unlock_irqrestore(&phba->hbalock, flags);

        rsp = &rspiocbq->iocb;
        pcmd = (struct lpfc_dmabuf *)cmdiocbq->context2;
        prsp = (struct lpfc_dmabuf *)pcmd->list.next;

        /* Copy the completed job data or determine the job status if job is
         * still active
         */

        if (job) {
                if (rsp->ulpStatus == IOSTAT_SUCCESS) {
                        rsp_size = rsp->un.elsreq64.bdl.bdeSize;
                        job->reply->reply_payload_rcv_len =
                                sg_copy_from_buffer(job->reply_payload.sg_list,
                                                    job->reply_payload.sg_cnt,
                                                    prsp->virt,
                                                    rsp_size);
                } else if (rsp->ulpStatus == IOSTAT_LS_RJT) {
                        job->reply->reply_payload_rcv_len =
                                sizeof(struct fc_bsg_ctels_reply);
                        /* LS_RJT data returned in word 4 */
                        rjt_data = (uint8_t *)&rsp->un.ulpWord[4];
                        els_reply = &job->reply->reply_data.ctels_reply;
                        els_reply->status = FC_CTELS_STATUS_REJECT;
                        els_reply->rjt_data.action = rjt_data[3];
                        els_reply->rjt_data.reason_code = rjt_data[2];
                        els_reply->rjt_data.reason_explanation = rjt_data[1];
                        els_reply->rjt_data.vendor_unique = rjt_data[0];
                } else {
                        rc = -EIO;
                }
        }

        lpfc_nlp_put(ndlp);
        lpfc_els_free_iocb(phba, cmdiocbq);
        kfree(dd_data);

        /* Complete the job if the job is still active */

        if (job) {
                job->reply->result = rc;
                job->job_done(job);
        }
        return;
}

/**
 * lpfc_bsg_rport_els - send an ELS command from a bsg request
 * @job: fc_bsg_job to handle
 **/
static int
lpfc_bsg_rport_els(struct fc_bsg_job *job)
{
        struct lpfc_vport *vport = (struct lpfc_vport *)job->shost->hostdata;
        struct lpfc_hba *phba = vport->phba;
        struct lpfc_rport_data *rdata = job->rport->dd_data;
        struct lpfc_nodelist *ndlp = rdata->pnode;
        uint32_t elscmd;
        uint32_t cmdsize;
        struct lpfc_iocbq *cmdiocbq;
        uint16_t rpi = 0;
        struct bsg_job_data *dd_data;
        unsigned long flags;
        uint32_t creg_val;
        int rc = 0;

        /* in case no data is transferred */
        job->reply->reply_payload_rcv_len = 0;

        /* verify the els command is not greater than the
         * maximum ELS transfer size.
         */

        if (job->request_payload.payload_len > FCELSSIZE) {
                rc = -EINVAL;
                goto no_dd_data;
        }

        /* allocate our bsg tracking structure */
        dd_data = kmalloc(sizeof(struct bsg_job_data), GFP_KERNEL);
        if (!dd_data) {
                lpfc_printf_log(phba, KERN_WARNING, LOG_LIBDFC,
                                "2735 Failed allocation of dd_data\n");
                rc = -ENOMEM;
                goto no_dd_data;
        }

        elscmd = job->request->rqst_data.r_els.els_code;
        cmdsize = job->request_payload.payload_len;

        if (!lpfc_nlp_get(ndlp)) {
                rc = -ENODEV;
                goto free_dd_data;
        }

        /* We will use the allocated dma buffers by prep els iocb for command
         * and response to ensure if the job times out and the request is freed,
         * we won't be dma into memory that is no longer allocated to for the
         * request.
         */

        cmdiocbq = lpfc_prep_els_iocb(vport, 1, cmdsize, 0, ndlp,
                                      ndlp->nlp_DID, elscmd);
        if (!cmdiocbq) {
                rc = -EIO;
                goto release_ndlp;
        }

        rpi = ndlp->nlp_rpi;

        /* Transfer the request payload to allocated command dma buffer */

        sg_copy_to_buffer(job->request_payload.sg_list,
                          job->request_payload.sg_cnt,
                          ((struct lpfc_dmabuf *)cmdiocbq->context2)->virt,
                          cmdsize);

        if (phba->sli_rev == LPFC_SLI_REV4)
                cmdiocbq->iocb.ulpContext = phba->sli4_hba.rpi_ids[rpi];
        else
                cmdiocbq->iocb.ulpContext = rpi;
        cmdiocbq->iocb_flag |= LPFC_IO_LIBDFC;
        cmdiocbq->context1 = dd_data;
        cmdiocbq->context_un.ndlp = ndlp;
        cmdiocbq->iocb_cmpl = lpfc_bsg_rport_els_cmp;
        dd_data->type = TYPE_IOCB;
        dd_data->set_job = job;
        dd_data->context_un.iocb.cmdiocbq = cmdiocbq;
        dd_data->context_un.iocb.ndlp = ndlp;
        dd_data->context_un.iocb.rmp = NULL;
        job->dd_data = dd_data;

        if (phba->cfg_poll & DISABLE_FCP_RING_INT) {
                if (lpfc_readl(phba->HCregaddr, &creg_val)) {
                        rc = -EIO;
                        goto linkdown_err;
                }
                creg_val |= (HC_R0INT_ENA << LPFC_FCP_RING);
                writel(creg_val, phba->HCregaddr);
                readl(phba->HCregaddr); /* flush */
        }

        rc = lpfc_sli_issue_iocb(phba, LPFC_ELS_RING, cmdiocbq, 0);

        if (rc == IOCB_SUCCESS) {
                spin_lock_irqsave(&phba->hbalock, flags);
                /* make sure the I/O had not been completed/released */
                if (cmdiocbq->iocb_flag & LPFC_IO_LIBDFC) {
                        /* open up abort window to timeout handler */
                        cmdiocbq->iocb_flag |= LPFC_IO_CMD_OUTSTANDING;
                }
                spin_unlock_irqrestore(&phba->hbalock, flags);
                return 0; /* done for now */
        } else if (rc == IOCB_BUSY) {
                rc = -EAGAIN;
        } else {
                rc = -EIO;
        }

        /* iocb failed so cleanup */
        job->dd_data = NULL;

linkdown_err:
        cmdiocbq->context1 = ndlp;
        lpfc_els_free_iocb(phba, cmdiocbq);

release_ndlp:
        lpfc_nlp_put(ndlp);

free_dd_data:
        kfree(dd_data);

no_dd_data:
        /* make error code available to userspace */
        job->reply->result = rc;
        job->dd_data = NULL;
        return rc;
}

/**
 * lpfc_bsg_event_free - frees an allocated event structure
 * @kref: Pointer to a kref.
 *
 * Called from kref_put. Back cast the kref into an event structure address.
 * Free any events to get, delete associated nodes, free any events to see,
 * free any data then free the event itself.
 **/
static void
lpfc_bsg_event_free(struct kref *kref)
{
        struct lpfc_bsg_event *evt = container_of(kref, struct lpfc_bsg_event,
                                                  kref);
        struct event_data *ed;

        list_del(&evt->node);

        while (!list_empty(&evt->events_to_get)) {
                ed = list_entry(evt->events_to_get.next, typeof(*ed), node);
                list_del(&ed->node);
                kfree(ed->data);
                kfree(ed);
        }

        while (!list_empty(&evt->events_to_see)) {
                ed = list_entry(evt->events_to_see.next, typeof(*ed), node);
                list_del(&ed->node);
                kfree(ed->data);
                kfree(ed);
        }

        kfree(evt->dd_data);
        kfree(evt);
}

/**
 * lpfc_bsg_event_ref - increments the kref for an event
 * @evt: Pointer to an event structure.
 **/
static inline void
lpfc_bsg_event_ref(struct lpfc_bsg_event *evt)
{
        kref_get(&evt->kref);
}

/**
 * lpfc_bsg_event_unref - Uses kref_put to free an event structure
 * @evt: Pointer to an event structure.
 **/
static inline void
lpfc_bsg_event_unref(struct lpfc_bsg_event *evt)
{
        kref_put(&evt->kref, lpfc_bsg_event_free);
}

/**
 * lpfc_bsg_event_new - allocate and initialize a event structure
 * @ev_mask: Mask of events.
 * @ev_reg_id: Event reg id.
 * @ev_req_id: Event request id.
 **/
static struct lpfc_bsg_event *
lpfc_bsg_event_new(uint32_t ev_mask, int ev_reg_id, uint32_t ev_req_id)
{
        struct lpfc_bsg_event *evt = kzalloc(sizeof(*evt), GFP_KERNEL);

        if (!evt)
                return NULL;

        INIT_LIST_HEAD(&evt->events_to_get);
        INIT_LIST_HEAD(&evt->events_to_see);
        evt->type_mask = ev_mask;
        evt->req_id = ev_req_id;
        evt->reg_id = ev_reg_id;
        evt->wait_time_stamp = jiffies;
        evt->dd_data = NULL;
        init_waitqueue_head(&evt->wq);
        kref_init(&evt->kref);
        return evt;
}

/**
 * diag_cmd_data_free - Frees an lpfc dma buffer extension
 * @phba: Pointer to HBA context object.
 * @mlist: Pointer to an lpfc dma buffer extension.
 **/
static int
diag_cmd_data_free(struct lpfc_hba *phba, struct lpfc_dmabufext *mlist)
{
        struct lpfc_dmabufext *mlast;
        struct pci_dev *pcidev;
        struct list_head head, *curr, *next;

        if ((!mlist) || (!lpfc_is_link_up(phba) &&
                (phba->link_flag & LS_LOOPBACK_MODE))) {
                return 0;
        }

        pcidev = phba->pcidev;
        list_add_tail(&head, &mlist->dma.list);

        list_for_each_safe(curr, next, &head) {
                mlast = list_entry(curr, struct lpfc_dmabufext , dma.list);
                if (mlast->dma.virt)
                        dma_free_coherent(&pcidev->dev,
                                          mlast->size,
                                          mlast->dma.virt,
                                          mlast->dma.phys);
                kfree(mlast);
        }
        return 0;
}

/**
 * lpfc_bsg_ct_unsol_event - process an unsolicited CT command
 * @phba:
 * @pring:
 * @piocbq:
 *
 * This function is called when an unsolicited CT command is received.  It
 * forwards the event to any processes registered to receive CT events.
 **/
int
lpfc_bsg_ct_unsol_event(struct lpfc_hba *phba, struct lpfc_sli_ring *pring,
                        struct lpfc_iocbq *piocbq)
{
        uint32_t evt_req_id = 0;
        uint32_t cmd;
        struct lpfc_dmabuf *dmabuf = NULL;
        struct lpfc_bsg_event *evt;
        struct event_data *evt_dat = NULL;
        struct lpfc_iocbq *iocbq;
        size_t offset = 0;
        struct list_head head;
        struct ulp_bde64 *bde;
        dma_addr_t dma_addr;
        int i;
        struct lpfc_dmabuf *bdeBuf1 = piocbq->context2;
        struct lpfc_dmabuf *bdeBuf2 = piocbq->context3;
        struct lpfc_hbq_entry *hbqe;
        struct lpfc_sli_ct_request *ct_req;
        struct fc_bsg_job *job = NULL;
        struct bsg_job_data *dd_data = NULL;
        unsigned long flags;
        int size = 0;

        INIT_LIST_HEAD(&head);
        list_add_tail(&head, &piocbq->list);

        if (piocbq->iocb.ulpBdeCount == 0 ||
            piocbq->iocb.un.cont64[0].tus.f.bdeSize == 0)
                goto error_ct_unsol_exit;

        if (phba->link_state == LPFC_HBA_ERROR ||
                (!(phba->sli.sli_flag & LPFC_SLI_ACTIVE)))
                goto error_ct_unsol_exit;

        if (phba->sli3_options & LPFC_SLI3_HBQ_ENABLED)
                dmabuf = bdeBuf1;
        else {
                dma_addr = getPaddr(piocbq->iocb.un.cont64[0].addrHigh,
                                    piocbq->iocb.un.cont64[0].addrLow);
                dmabuf = lpfc_sli_ringpostbuf_get(phba, pring, dma_addr);
        }
        if (dmabuf == NULL)
                goto error_ct_unsol_exit;
        ct_req = (struct lpfc_sli_ct_request *)dmabuf->virt;
        evt_req_id = ct_req->FsType;
        cmd = ct_req->CommandResponse.bits.CmdRsp;
        if (!(phba->sli3_options & LPFC_SLI3_HBQ_ENABLED))
                lpfc_sli_ringpostbuf_put(phba, pring, dmabuf);

        spin_lock_irqsave(&phba->ct_ev_lock, flags);
        list_for_each_entry(evt, &phba->ct_ev_waiters, node) {
                if (!(evt->type_mask & FC_REG_CT_EVENT) ||
                        evt->req_id != evt_req_id)
                        continue;

                lpfc_bsg_event_ref(evt);
                spin_unlock_irqrestore(&phba->ct_ev_lock, flags);
                evt_dat = kzalloc(sizeof(*evt_dat), GFP_KERNEL);
                if (evt_dat == NULL) {
                        spin_lock_irqsave(&phba->ct_ev_lock, flags);
                        lpfc_bsg_event_unref(evt);
                        lpfc_printf_log(phba, KERN_WARNING, LOG_LIBDFC,
                                        "2614 Memory allocation failed for "
                                        "CT event\n");
                        break;
                }

                if (phba->sli3_options & LPFC_SLI3_HBQ_ENABLED) {
                        /* take accumulated byte count from the last iocbq */
                        iocbq = list_entry(head.prev, typeof(*iocbq), list);
                        evt_dat->len = iocbq->iocb.unsli3.rcvsli3.acc_len;
                } else {
                        list_for_each_entry(iocbq, &head, list) {
                                for (i = 0; i < iocbq->iocb.ulpBdeCount; i++)
                                        evt_dat->len +=
                                        iocbq->iocb.un.cont64[i].tus.f.bdeSize;
                        }
                }

                evt_dat->data = kzalloc(evt_dat->len, GFP_KERNEL);
                if (evt_dat->data == NULL) {
                        lpfc_printf_log(phba, KERN_WARNING, LOG_LIBDFC,
                                        "2615 Memory allocation failed for "
                                        "CT event data, size %d\n",
                                        evt_dat->len);
                        kfree(evt_dat);
                        spin_lock_irqsave(&phba->ct_ev_lock, flags);
                        lpfc_bsg_event_unref(evt);
                        spin_unlock_irqrestore(&phba->ct_ev_lock, flags);
                        goto error_ct_unsol_exit;
                }

                list_for_each_entry(iocbq, &head, list) {
                        size = 0;
                        if (phba->sli3_options & LPFC_SLI3_HBQ_ENABLED) {
                                bdeBuf1 = iocbq->context2;
                                bdeBuf2 = iocbq->context3;
                        }
                        for (i = 0; i < iocbq->iocb.ulpBdeCount; i++) {

                                if (phba->sli3_options &
                                    LPFC_SLI3_HBQ_ENABLED) {
                                        if (i == 0) {
                                                hbqe = (struct lpfc_hbq_entry *)
                                                  &iocbq->iocb.un.ulpWord[0];
                                                size = hbqe->bde.tus.f.bdeSize;
                                                dmabuf = bdeBuf1;
                                        } else if (i == 1) {
                                                hbqe = (struct lpfc_hbq_entry *)
                                                        &iocbq->iocb.unsli3.
                                                        sli3Words[4];
                                                size = hbqe->bde.tus.f.bdeSize;
                                                dmabuf = bdeBuf2;
                                        }
                                        if ((offset + size) > evt_dat->len)
                                                size = evt_dat->len - offset;
                                } else {
                                        size = iocbq->iocb.un.cont64[i].
                                                tus.f.bdeSize;
                                        bde = &iocbq->iocb.un.cont64[i];
                                        dma_addr = getPaddr(bde->addrHigh,
                                                            bde->addrLow);
                                        dmabuf = lpfc_sli_ringpostbuf_get(phba,
                                                        pring, dma_addr);
                                }
                                if (!dmabuf) {
                                        lpfc_printf_log(phba, KERN_ERR,
                                                LOG_LIBDFC, "2616 No dmabuf "
                                                "found for iocbq 0x%p\n",
                                                iocbq);
                                        kfree(evt_dat->data);
                                        kfree(evt_dat);
                                        spin_lock_irqsave(&phba->ct_ev_lock,
                                                flags);
                                        lpfc_bsg_event_unref(evt);
                                        spin_unlock_irqrestore(
                                                &phba->ct_ev_lock, flags);
                                        goto error_ct_unsol_exit;
                                }
                                memcpy((char *)(evt_dat->data) + offset,
                                       dmabuf->virt, size);
                                offset += size;
                                if (evt_req_id != SLI_CT_ELX_LOOPBACK &&
                                    !(phba->sli3_options &
                                      LPFC_SLI3_HBQ_ENABLED)) {
                                        lpfc_sli_ringpostbuf_put(phba, pring,
                                                                 dmabuf);
                                } else {
                                        switch (cmd) {
                                        case ELX_LOOPBACK_DATA:
                                                if (phba->sli_rev <
                                                    LPFC_SLI_REV4)
                                                        diag_cmd_data_free(phba,
                                                        (struct lpfc_dmabufext
                                                         *)dmabuf);
                                                break;
                                        case ELX_LOOPBACK_XRI_SETUP:
                                                if ((phba->sli_rev ==
                                                        LPFC_SLI_REV2) ||
                                                        (phba->sli3_options &
                                                        LPFC_SLI3_HBQ_ENABLED
                                                        )) {
                                                        lpfc_in_buf_free(phba,
                                                                        dmabuf);
                                                } else {
                                                        lpfc_post_buffer(phba,
                                                                         pring,
                                                                         1);
                                                }
                                                break;
                                        default:
                                                if (!(phba->sli3_options &
                                                      LPFC_SLI3_HBQ_ENABLED))
                                                        lpfc_post_buffer(phba,
                                                                         pring,
                                                                         1);
                                                break;
                                        }
                                }
                        }
                }

                spin_lock_irqsave(&phba->ct_ev_lock, flags);
                if (phba->sli_rev == LPFC_SLI_REV4) {
                        evt_dat->immed_dat = phba->ctx_idx;
                        phba->ctx_idx = (phba->ctx_idx + 1) % LPFC_CT_CTX_MAX;
                        /* Provide warning for over-run of the ct_ctx array */
                        if (phba->ct_ctx[evt_dat->immed_dat].valid ==
                            UNSOL_VALID)
                                lpfc_printf_log(phba, KERN_WARNING, LOG_ELS,
                                                "2717 CT context array entry "
                                                "[%d] over-run: oxid:x%x, "
                                                "sid:x%x\n", phba->ctx_idx,
                                                phba->ct_ctx[
                                                    evt_dat->immed_dat].oxid,
                                                phba->ct_ctx[
                                                    evt_dat->immed_dat].SID);
                        phba->ct_ctx[evt_dat->immed_dat].rxid =
                                piocbq->iocb.ulpContext;
                        phba->ct_ctx[evt_dat->immed_dat].oxid =
                                piocbq->iocb.unsli3.rcvsli3.ox_id;
                        phba->ct_ctx[evt_dat->immed_dat].SID =
                                piocbq->iocb.un.rcvels.remoteID;
                        phba->ct_ctx[evt_dat->immed_dat].valid = UNSOL_VALID;
                } else
                        evt_dat->immed_dat = piocbq->iocb.ulpContext;

                evt_dat->type = FC_REG_CT_EVENT;
                list_add(&evt_dat->node, &evt->events_to_see);
                if (evt_req_id == SLI_CT_ELX_LOOPBACK) {
                        wake_up_interruptible(&evt->wq);
                        lpfc_bsg_event_unref(evt);
                        break;
                }

                list_move(evt->events_to_see.prev, &evt->events_to_get);

                dd_data = (struct bsg_job_data *)evt->dd_data;
                job = dd_data->set_job;
                dd_data->set_job = NULL;
                lpfc_bsg_event_unref(evt);
                if (job) {
                        job->reply->reply_payload_rcv_len = size;
                        /* make error code available to userspace */
                        job->reply->result = 0;
                        job->dd_data = NULL;
                        /* complete the job back to userspace */
                        spin_unlock_irqrestore(&phba->ct_ev_lock, flags);
                        job->job_done(job);
                        spin_lock_irqsave(&phba->ct_ev_lock, flags);
                }
        }
        spin_unlock_irqrestore(&phba->ct_ev_lock, flags);

error_ct_unsol_exit:
        if (!list_empty(&head))
                list_del(&head);
        if ((phba->sli_rev < LPFC_SLI_REV4) &&
            (evt_req_id == SLI_CT_ELX_LOOPBACK))
                return 0;
        return 1;
}

/**
 * lpfc_bsg_ct_unsol_abort - handler ct abort to management plane
 * @phba: Pointer to HBA context object.
 * @dmabuf: pointer to a dmabuf that describes the FC sequence
 *
 * This function handles abort to the CT command toward management plane
 * for SLI4 port.
 *
 * If the pending context of a CT command to management plane present, clears
 * such context and returns 1 for handled; otherwise, it returns 0 indicating
 * no context exists.
 **/
int
lpfc_bsg_ct_unsol_abort(struct lpfc_hba *phba, struct hbq_dmabuf *dmabuf)
{
        struct fc_frame_header fc_hdr;
        struct fc_frame_header *fc_hdr_ptr = &fc_hdr;
        int ctx_idx, handled = 0;
        uint16_t oxid, rxid;
        uint32_t sid;

        memcpy(fc_hdr_ptr, dmabuf->hbuf.virt, sizeof(struct fc_frame_header));
        sid = sli4_sid_from_fc_hdr(fc_hdr_ptr);
        oxid = be16_to_cpu(fc_hdr_ptr->fh_ox_id);
        rxid = be16_to_cpu(fc_hdr_ptr->fh_rx_id);

        for (ctx_idx = 0; ctx_idx < LPFC_CT_CTX_MAX; ctx_idx++) {
                if (phba->ct_ctx[ctx_idx].valid != UNSOL_VALID)
                        continue;
                if (phba->ct_ctx[ctx_idx].rxid != rxid)
                        continue;
                if (phba->ct_ctx[ctx_idx].oxid != oxid)
                        continue;
                if (phba->ct_ctx[ctx_idx].SID != sid)
                        continue;
                phba->ct_ctx[ctx_idx].valid = UNSOL_INVALID;
                handled = 1;
        }
        return handled;
}

/**
 * lpfc_bsg_hba_set_event - process a SET_EVENT bsg vendor command
 * @job: SET_EVENT fc_bsg_job
 **/
static int
lpfc_bsg_hba_set_event(struct fc_bsg_job *job)
{
        struct lpfc_vport *vport = (struct lpfc_vport *)job->shost->hostdata;
        struct lpfc_hba *phba = vport->phba;
        struct set_ct_event *event_req;
        struct lpfc_bsg_event *evt;
        int rc = 0;
        struct bsg_job_data *dd_data = NULL;
        uint32_t ev_mask;
        unsigned long flags;

        if (job->request_len <
            sizeof(struct fc_bsg_request) + sizeof(struct set_ct_event)) {
                lpfc_printf_log(phba, KERN_WARNING, LOG_LIBDFC,
                                "2612 Received SET_CT_EVENT below minimum "
                                "size\n");
                rc = -EINVAL;
                goto job_error;
        }

        event_req = (struct set_ct_event *)
                job->request->rqst_data.h_vendor.vendor_cmd;
        ev_mask = ((uint32_t)(unsigned long)event_req->type_mask &
                                FC_REG_EVENT_MASK);
        spin_lock_irqsave(&phba->ct_ev_lock, flags);
        list_for_each_entry(evt, &phba->ct_ev_waiters, node) {
                if (evt->reg_id == event_req->ev_reg_id) {
                        lpfc_bsg_event_ref(evt);
                        evt->wait_time_stamp = jiffies;
                        dd_data = (struct bsg_job_data *)evt->dd_data;
                        break;
                }
        }
        spin_unlock_irqrestore(&phba->ct_ev_lock, flags);

        if (&evt->node == &phba->ct_ev_waiters) {
                /* no event waiting struct yet - first call */
                dd_data = kmalloc(sizeof(struct bsg_job_data), GFP_KERNEL);
                if (dd_data == NULL) {
                        lpfc_printf_log(phba, KERN_WARNING, LOG_LIBDFC,
                                        "2734 Failed allocation of dd_data\n");
                        rc = -ENOMEM;
                        goto job_error;
                }
                evt = lpfc_bsg_event_new(ev_mask, event_req->ev_reg_id,
                                        event_req->ev_req_id);
                if (!evt) {
                        lpfc_printf_log(phba, KERN_WARNING, LOG_LIBDFC,
                                        "2617 Failed allocation of event "
                                        "waiter\n");
                        rc = -ENOMEM;
                        goto job_error;
                }
                dd_data->type = TYPE_EVT;
                dd_data->set_job = NULL;
                dd_data->context_un.evt = evt;
                evt->dd_data = (void *)dd_data;
                spin_lock_irqsave(&phba->ct_ev_lock, flags);
                list_add(&evt->node, &phba->ct_ev_waiters);
                lpfc_bsg_event_ref(evt);
                evt->wait_time_stamp = jiffies;
                spin_unlock_irqrestore(&phba->ct_ev_lock, flags);
        }

        spin_lock_irqsave(&phba->ct_ev_lock, flags);
        evt->waiting = 1;
        dd_data->set_job = job; /* for unsolicited command */
        job->dd_data = dd_data; /* for fc transport timeout callback*/
        spin_unlock_irqrestore(&phba->ct_ev_lock, flags);
        return 0; /* call job done later */

job_error:
        if (dd_data != NULL)
                kfree(dd_data);

        job->dd_data = NULL;
        return rc;
}

/**
 * lpfc_bsg_hba_get_event - process a GET_EVENT bsg vendor command
 * @job: GET_EVENT fc_bsg_job
 **/
static int
lpfc_bsg_hba_get_event(struct fc_bsg_job *job)
{
        struct lpfc_vport *vport = (struct lpfc_vport *)job->shost->hostdata;
        struct lpfc_hba *phba = vport->phba;
        struct get_ct_event *event_req;
        struct get_ct_event_reply *event_reply;
        struct lpfc_bsg_event *evt, *evt_next;
        struct event_data *evt_dat = NULL;
        unsigned long flags;
        uint32_t rc = 0;

        if (job->request_len <
            sizeof(struct fc_bsg_request) + sizeof(struct get_ct_event)) {
                lpfc_printf_log(phba, KERN_WARNING, LOG_LIBDFC,
                                "2613 Received GET_CT_EVENT request below "
                                "minimum size\n");
                rc = -EINVAL;
                goto job_error;
        }

        event_req = (struct get_ct_event *)
                job->request->rqst_data.h_vendor.vendor_cmd;

        event_reply = (struct get_ct_event_reply *)
                job->reply->reply_data.vendor_reply.vendor_rsp;
        spin_lock_irqsave(&phba->ct_ev_lock, flags);
        list_for_each_entry_safe(evt, evt_next, &phba->ct_ev_waiters, node) {
                if (evt->reg_id == event_req->ev_reg_id) {
                        if (list_empty(&evt->events_to_get))
                                break;
                        lpfc_bsg_event_ref(evt);
                        evt->wait_time_stamp = jiffies;
                        evt_dat = list_entry(evt->events_to_get.prev,
                                             struct event_data, node);
                        list_del(&evt_dat->node);
                        break;
                }
        }
        spin_unlock_irqrestore(&phba->ct_ev_lock, flags);

        /* The app may continue to ask for event data until it gets
         * an error indicating that there isn't anymore
         */
        if (evt_dat == NULL) {
                job->reply->reply_payload_rcv_len = 0;
                rc = -ENOENT;
                goto job_error;
        }

        if (evt_dat->len > job->request_payload.payload_len) {
                evt_dat->len = job->request_payload.payload_len;
                lpfc_printf_log(phba, KERN_WARNING, LOG_LIBDFC,
                                "2618 Truncated event data at %d "
                                "bytes\n",
                                job->request_payload.payload_len);
        }

        event_reply->type = evt_dat->type;
        event_reply->immed_data = evt_dat->immed_dat;
        if (evt_dat->len > 0)
                job->reply->reply_payload_rcv_len =
                        sg_copy_from_buffer(job->request_payload.sg_list,
                                            job->request_payload.sg_cnt,
                                            evt_dat->data, evt_dat->len);
        else
                job->reply->reply_payload_rcv_len = 0;

        if (evt_dat) {
                kfree(evt_dat->data);
                kfree(evt_dat);
        }

        spin_lock_irqsave(&phba->ct_ev_lock, flags);
        lpfc_bsg_event_unref(evt);
        spin_unlock_irqrestore(&phba->ct_ev_lock, flags);
        job->dd_data = NULL;
        job->reply->result = 0;
        job->job_done(job);
        return 0;

job_error:
        job->dd_data = NULL;
        job->reply->result = rc;
        return rc;
}

/**
 * lpfc_issue_ct_rsp_cmp - lpfc_issue_ct_rsp's completion handler
 * @phba: Pointer to HBA context object.
 * @cmdiocbq: Pointer to command iocb.
 * @rspiocbq: Pointer to response iocb.
 *
 * This function is the completion handler for iocbs issued using
 * lpfc_issue_ct_rsp_cmp function. This function is called by the
 * ring event handler function without any lock held. This function
 * can be called from both worker thread context and interrupt
 * context. This function also can be called from other thread which
 * cleans up the SLI layer objects.
 * This function copy the contents of the response iocb to the
 * response iocb memory object provided by the caller of
 * lpfc_sli_issue_iocb_wait and then wakes up the thread which
 * sleeps for the iocb completion.
 **/
static void
lpfc_issue_ct_rsp_cmp(struct lpfc_hba *phba,
                        struct lpfc_iocbq *cmdiocbq,
                        struct lpfc_iocbq *rspiocbq)
{
        struct bsg_job_data *dd_data;
        struct fc_bsg_job *job;
        IOCB_t *rsp;
        struct lpfc_dmabuf *bmp, *cmp;
        struct lpfc_nodelist *ndlp;
        unsigned long flags;
        int rc = 0;

        dd_data = cmdiocbq->context1;

        /* Determine if job has been aborted */
        spin_lock_irqsave(&phba->ct_ev_lock, flags);
        job = dd_data->set_job;
        if (job) {
                /* Prevent timeout handling from trying to abort job  */
                job->dd_data = NULL;
        }
        spin_unlock_irqrestore(&phba->ct_ev_lock, flags);

        /* Close the timeout handler abort window */
        spin_lock_irqsave(&phba->hbalock, flags);
        cmdiocbq->iocb_flag &= ~LPFC_IO_CMD_OUTSTANDING;
        spin_unlock_irqrestore(&phba->hbalock, flags);

        ndlp = dd_data->context_un.iocb.ndlp;
        cmp = cmdiocbq->context2;
        bmp = cmdiocbq->context3;
        rsp = &rspiocbq->iocb;

        /* Copy the completed job data or set the error status */

        if (job) {
                if (rsp->ulpStatus) {
                        if (rsp->ulpStatus == IOSTAT_LOCAL_REJECT) {
                                switch (rsp->un.ulpWord[4] & IOERR_PARAM_MASK) {
                                case IOERR_SEQUENCE_TIMEOUT:
                                        rc = -ETIMEDOUT;
                                        break;
                                case IOERR_INVALID_RPI:
                                        rc = -EFAULT;
                                        break;
                                default:
                                        rc = -EACCES;
                                        break;
                                }
                        } else {
                                rc = -EACCES;
                        }
                } else {
                        job->reply->reply_payload_rcv_len = 0;
                }
        }

        lpfc_free_bsg_buffers(phba, cmp);
        lpfc_mbuf_free(phba, bmp->virt, bmp->phys);
        kfree(bmp);
        lpfc_sli_release_iocbq(phba, cmdiocbq);
        lpfc_nlp_put(ndlp);
        kfree(dd_data);

        /* Complete the job if the job is still active */

        if (job) {
                job->reply->result = rc;
                job->job_done(job);
        }
        return;
}

/**
 * lpfc_issue_ct_rsp - issue a ct response
 * @phba: Pointer to HBA context object.
 * @job: Pointer to the job object.
 * @tag: tag index value into the ports context exchange array.
 * @bmp: Pointer to a dma buffer descriptor.
 * @num_entry: Number of enties in the bde.
 **/
static int
lpfc_issue_ct_rsp(struct lpfc_hba *phba, struct fc_bsg_job *job, uint32_t tag,
                  struct lpfc_dmabuf *cmp, struct lpfc_dmabuf *bmp,
                  int num_entry)
{
        IOCB_t *icmd;
        struct lpfc_iocbq *ctiocb = NULL;
        int rc = 0;
        struct lpfc_nodelist *ndlp = NULL;
        struct bsg_job_data *dd_data;
        unsigned long flags;
        uint32_t creg_val;

        /* allocate our bsg tracking structure */
        dd_data = kmalloc(sizeof(struct bsg_job_data), GFP_KERNEL);
        if (!dd_data) {
                lpfc_printf_log(phba, KERN_WARNING, LOG_LIBDFC,
                                "2736 Failed allocation of dd_data\n");
                rc = -ENOMEM;
                goto no_dd_data;
        }

        /* Allocate buffer for  command iocb */
        ctiocb = lpfc_sli_get_iocbq(phba);
        if (!ctiocb) {
                rc = -ENOMEM;
                goto no_ctiocb;
        }

        icmd = &ctiocb->iocb;
        icmd->un.xseq64.bdl.ulpIoTag32 = 0;
        icmd->un.xseq64.bdl.addrHigh = putPaddrHigh(bmp->phys);
        icmd->un.xseq64.bdl.addrLow = putPaddrLow(bmp->phys);
        icmd->un.xseq64.bdl.bdeFlags = BUFF_TYPE_BLP_64;
        icmd->un.xseq64.bdl.bdeSize = (num_entry * sizeof(struct ulp_bde64));
        icmd->un.xseq64.w5.hcsw.Fctl = (LS | LA);
        icmd->un.xseq64.w5.hcsw.Dfctl = 0;
        icmd->un.xseq64.w5.hcsw.Rctl = FC_RCTL_DD_SOL_CTL;
        icmd->un.xseq64.w5.hcsw.Type = FC_TYPE_CT;

        /* Fill in rest of iocb */
        icmd->ulpCommand = CMD_XMIT_SEQUENCE64_CX;
        icmd->ulpBdeCount = 1;
        icmd->ulpLe = 1;
        icmd->ulpClass = CLASS3;
        if (phba->sli_rev == LPFC_SLI_REV4) {
                /* Do not issue unsol response if oxid not marked as valid */
                if (phba->ct_ctx[tag].valid != UNSOL_VALID) {
                        rc = IOCB_ERROR;
                        goto issue_ct_rsp_exit;
                }
                icmd->ulpContext = phba->ct_ctx[tag].rxid;
                icmd->unsli3.rcvsli3.ox_id = phba->ct_ctx[tag].oxid;
                ndlp = lpfc_findnode_did(phba->pport, phba->ct_ctx[tag].SID);
                if (!ndlp) {
                        lpfc_printf_log(phba, KERN_WARNING, LOG_ELS,
                                 "2721 ndlp null for oxid %x SID %x\n",
                                        icmd->ulpContext,
                                        phba->ct_ctx[tag].SID);
                        rc = IOCB_ERROR;
                        goto issue_ct_rsp_exit;
                }

                /* Check if the ndlp is active */
                if (!ndlp || !NLP_CHK_NODE_ACT(ndlp)) {
                        rc = IOCB_ERROR;
                        goto issue_ct_rsp_exit;
                }

                /* get a refernece count so the ndlp doesn't go away while
                 * we respond
                 */
                if (!lpfc_nlp_get(ndlp)) {
                        rc = IOCB_ERROR;
                        goto issue_ct_rsp_exit;
                }

                icmd->un.ulpWord[3] =
                                phba->sli4_hba.rpi_ids[ndlp->nlp_rpi];

                /* The exchange is done, mark the entry as invalid */
                phba->ct_ctx[tag].valid = UNSOL_INVALID;
        } else
                icmd->ulpContext = (ushort) tag;

        icmd->ulpTimeout = phba->fc_ratov * 2;

        /* Xmit CT response on exchange <xid> */
        lpfc_printf_log(phba, KERN_INFO, LOG_ELS,
                "2722 Xmit CT response on exchange x%x Data: x%x x%x x%x\n",
                icmd->ulpContext, icmd->ulpIoTag, tag, phba->link_state);

        ctiocb->iocb_cmpl = NULL;
        ctiocb->iocb_flag |= LPFC_IO_LIBDFC;
        ctiocb->vport = phba->pport;
        ctiocb->context1 = dd_data;
        ctiocb->context2 = cmp;
        ctiocb->context3 = bmp;
        ctiocb->context_un.ndlp = ndlp;
        ctiocb->iocb_cmpl = lpfc_issue_ct_rsp_cmp;

        dd_data->type = TYPE_IOCB;
        dd_data->set_job = job;
        dd_data->context_un.iocb.cmdiocbq = ctiocb;
        dd_data->context_un.iocb.ndlp = ndlp;
        dd_data->context_un.iocb.rmp = NULL;
        job->dd_data = dd_data;

        if (phba->cfg_poll & DISABLE_FCP_RING_INT) {
                if (lpfc_readl(phba->HCregaddr, &creg_val)) {
                        rc = -IOCB_ERROR;
                        goto issue_ct_rsp_exit;
                }
                creg_val |= (HC_R0INT_ENA << LPFC_FCP_RING);
                writel(creg_val, phba->HCregaddr);
                readl(phba->HCregaddr); /* flush */
        }

        rc = lpfc_sli_issue_iocb(phba, LPFC_ELS_RING, ctiocb, 0);

        if (rc == IOCB_SUCCESS) {
                spin_lock_irqsave(&phba->hbalock, flags);
                /* make sure the I/O had not been completed/released */
                if (ctiocb->iocb_flag & LPFC_IO_LIBDFC) {
                        /* open up abort window to timeout handler */
                        ctiocb->iocb_flag |= LPFC_IO_CMD_OUTSTANDING;
                }
                spin_unlock_irqrestore(&phba->hbalock, flags);
                return 0; /* done for now */
        }

        /* iocb failed so cleanup */
        job->dd_data = NULL;

issue_ct_rsp_exit:
        lpfc_sli_release_iocbq(phba, ctiocb);
no_ctiocb:
        kfree(dd_data);
no_dd_data:
        return rc;
}

/**
 * lpfc_bsg_send_mgmt_rsp - process a SEND_MGMT_RESP bsg vendor command
 * @job: SEND_MGMT_RESP fc_bsg_job
 **/
static int
lpfc_bsg_send_mgmt_rsp(struct fc_bsg_job *job)
{
        struct lpfc_vport *vport = (struct lpfc_vport *)job->shost->hostdata;
        struct lpfc_hba *phba = vport->phba;
        struct send_mgmt_resp *mgmt_resp = (struct send_mgmt_resp *)
                job->request->rqst_data.h_vendor.vendor_cmd;
        struct ulp_bde64 *bpl;
        struct lpfc_dmabuf *bmp = NULL, *cmp = NULL;
        int bpl_entries;
        uint32_t tag = mgmt_resp->tag;
        unsigned long reqbfrcnt =
                        (unsigned long)job->request_payload.payload_len;
        int rc = 0;

        /* in case no data is transferred */
        job->reply->reply_payload_rcv_len = 0;

        if (!reqbfrcnt || (reqbfrcnt > (80 * BUF_SZ_4K))) {
                rc = -ERANGE;
                goto send_mgmt_rsp_exit;
        }

        bmp = kmalloc(sizeof(struct lpfc_dmabuf), GFP_KERNEL);
        if (!bmp) {
                rc = -ENOMEM;
                goto send_mgmt_rsp_exit;
        }

        bmp->virt = lpfc_mbuf_alloc(phba, 0, &bmp->phys);
        if (!bmp->virt) {
                rc = -ENOMEM;
                goto send_mgmt_rsp_free_bmp;
        }

        INIT_LIST_HEAD(&bmp->list);
        bpl = (struct ulp_bde64 *) bmp->virt;
        bpl_entries = (LPFC_BPL_SIZE/sizeof(struct ulp_bde64));
        cmp = lpfc_alloc_bsg_buffers(phba, job->request_payload.payload_len,
                                     1, bpl, &bpl_entries);
        if (!cmp) {
                rc = -ENOMEM;
                goto send_mgmt_rsp_free_bmp;
        }
        lpfc_bsg_copy_data(cmp, &job->request_payload,
                           job->request_payload.payload_len, 1);

        rc = lpfc_issue_ct_rsp(phba, job, tag, cmp, bmp, bpl_entries);

        if (rc == IOCB_SUCCESS)
                return 0; /* done for now */

        rc = -EACCES;

        lpfc_free_bsg_buffers(phba, cmp);

send_mgmt_rsp_free_bmp:
        if (bmp->virt)
                lpfc_mbuf_free(phba, bmp->virt, bmp->phys);
        kfree(bmp);
send_mgmt_rsp_exit:
        /* make error code available to userspace */
        job->reply->result = rc;
        job->dd_data = NULL;
        return rc;
}

/**
 * lpfc_bsg_diag_mode_enter - process preparing into device diag loopback mode
 * @phba: Pointer to HBA context object.
 *
 * This function is responsible for preparing driver for diag loopback
 * on device.
 */
static int
lpfc_bsg_diag_mode_enter(struct lpfc_hba *phba)
{
        struct lpfc_vport **vports;
        struct Scsi_Host *shost;
        struct lpfc_sli *psli;
        struct lpfc_sli_ring *pring;
        int i = 0;

        psli = &phba->sli;
        if (!psli)
                return -ENODEV;

        pring = &psli->ring[LPFC_FCP_RING];
        if (!pring)
                return -ENODEV;

        if ((phba->link_state == LPFC_HBA_ERROR) ||
            (psli->sli_flag & LPFC_BLOCK_MGMT_IO) ||
            (!(psli->sli_flag & LPFC_SLI_ACTIVE)))
                return -EACCES;

        vports = lpfc_create_vport_work_array(phba);
        if (vports) {
                for (i = 0; i <= phba->max_vpi && vports[i] != NULL; i++) {
                        shost = lpfc_shost_from_vport(vports[i]);
                        scsi_block_requests(shost);
                }
                lpfc_destroy_vport_work_array(phba, vports);
        } else {
                shost = lpfc_shost_from_vport(phba->pport);
                scsi_block_requests(shost);
        }

        while (!list_empty(&pring->txcmplq)) {
                if (i++ > 500)  /* wait up to 5 seconds */
                        break;
                msleep(10);
        }
        return 0;
}

/**
 * lpfc_bsg_diag_mode_exit - exit process from device diag loopback mode
 * @phba: Pointer to HBA context object.
 *
 * This function is responsible for driver exit processing of setting up
 * diag loopback mode on device.
 */
static void
lpfc_bsg_diag_mode_exit(struct lpfc_hba *phba)
{
        struct Scsi_Host *shost;
        struct lpfc_vport **vports;
        int i;

        vports = lpfc_create_vport_work_array(phba);
        if (vports) {
                for (i = 0; i <= phba->max_vpi && vports[i] != NULL; i++) {
                        shost = lpfc_shost_from_vport(vports[i]);
                        scsi_unblock_requests(shost);
                }
                lpfc_destroy_vport_work_array(phba, vports);
        } else {
                shost = lpfc_shost_from_vport(phba->pport);
                scsi_unblock_requests(shost);
        }
        return;
}

/**
 * lpfc_sli3_bsg_diag_loopback_mode - process an sli3 bsg vendor command
 * @phba: Pointer to HBA context object.
 * @job: LPFC_BSG_VENDOR_DIAG_MODE
 *
 * This function is responsible for placing an sli3  port into diagnostic
 * loopback mode in order to perform a diagnostic loopback test.
 * All new scsi requests are blocked, a small delay is used to allow the
 * scsi requests to complete then the link is brought down. If the link is
 * is placed in loopback mode then scsi requests are again allowed
 * so the scsi mid-layer doesn't give up on the port.
 * All of this is done in-line.
 */
static int
lpfc_sli3_bsg_diag_loopback_mode(struct lpfc_hba *phba, struct fc_bsg_job *job)
{
        struct diag_mode_set *loopback_mode;
        uint32_t link_flags;
        uint32_t timeout;
        LPFC_MBOXQ_t *pmboxq  = NULL;
        int mbxstatus = MBX_SUCCESS;
        int i = 0;
        int rc = 0;

        /* no data to return just the return code */
        job->reply->reply_payload_rcv_len = 0;

        if (job->request_len < sizeof(struct fc_bsg_request) +
            sizeof(struct diag_mode_set)) {
                lpfc_printf_log(phba, KERN_WARNING, LOG_LIBDFC,
                                "2738 Received DIAG MODE request size:%d "
                                "below the minimum size:%d\n",
                                job->request_len,
                                (int)(sizeof(struct fc_bsg_request) +
                                sizeof(struct diag_mode_set)));
                rc = -EINVAL;
                goto job_error;
        }

        rc = lpfc_bsg_diag_mode_enter(phba);
        if (rc)
                goto job_error;

        /* bring the link to diagnostic mode */
        loopback_mode = (struct diag_mode_set *)
                job->request->rqst_data.h_vendor.vendor_cmd;
        link_flags = loopback_mode->type;
        timeout = loopback_mode->timeout * 100;

        pmboxq = mempool_alloc(phba->mbox_mem_pool, GFP_KERNEL);
        if (!pmboxq) {
                rc = -ENOMEM;
                goto loopback_mode_exit;
        }
        memset((void *)pmboxq, 0, sizeof(LPFC_MBOXQ_t));
        pmboxq->u.mb.mbxCommand = MBX_DOWN_LINK;
        pmboxq->u.mb.mbxOwner = OWN_HOST;

        mbxstatus = lpfc_sli_issue_mbox_wait(phba, pmboxq, LPFC_MBOX_TMO);

        if ((mbxstatus == MBX_SUCCESS) && (pmboxq->u.mb.mbxStatus == 0)) {
                /* wait for link down before proceeding */
                i = 0;
                while (phba->link_state != LPFC_LINK_DOWN) {
                        if (i++ > timeout) {
                                rc = -ETIMEDOUT;
                                goto loopback_mode_exit;
                        }
                        msleep(10);
                }

                memset((void *)pmboxq, 0, sizeof(LPFC_MBOXQ_t));
                if (link_flags == INTERNAL_LOOP_BACK)
                        pmboxq->u.mb.un.varInitLnk.link_flags = FLAGS_LOCAL_LB;
                else
                        pmboxq->u.mb.un.varInitLnk.link_flags =
                                FLAGS_TOPOLOGY_MODE_LOOP;

                pmboxq->u.mb.mbxCommand = MBX_INIT_LINK;
                pmboxq->u.mb.mbxOwner = OWN_HOST;

                mbxstatus = lpfc_sli_issue_mbox_wait(phba, pmboxq,
                                                     LPFC_MBOX_TMO);

                if ((mbxstatus != MBX_SUCCESS) || (pmboxq->u.mb.mbxStatus))
                        rc = -ENODEV;
                else {
                        spin_lock_irq(&phba->hbalock);
                        phba->link_flag |= LS_LOOPBACK_MODE;
                        spin_unlock_irq(&phba->hbalock);
                        /* wait for the link attention interrupt */
                        msleep(100);

                        i = 0;
                        while (phba->link_state != LPFC_HBA_READY) {
                                if (i++ > timeout) {
                                        rc = -ETIMEDOUT;
                                        break;
                                }

                                msleep(10);
                        }
                }

        } else
                rc = -ENODEV;

loopback_mode_exit:
        lpfc_bsg_diag_mode_exit(phba);

        /*
         * Let SLI layer release mboxq if mbox command completed after timeout.
         */
        if (pmboxq && mbxstatus != MBX_TIMEOUT)
                mempool_free(pmboxq, phba->mbox_mem_pool);

job_error:
        /* make error code available to userspace */
        job->reply->result = rc;
        /* complete the job back to userspace if no error */
        if (rc == 0)
                job->job_done(job);
        return rc;
}

/**
 * lpfc_sli4_bsg_set_link_diag_state - set sli4 link diag state
 * @phba: Pointer to HBA context object.
 * @diag: Flag for set link to diag or nomral operation state.
 *
 * This function is responsible for issuing a sli4 mailbox command for setting
 * link to either diag state or normal operation state.
 */
static int
lpfc_sli4_bsg_set_link_diag_state(struct lpfc_hba *phba, uint32_t diag)
{
        LPFC_MBOXQ_t *pmboxq;
        struct lpfc_mbx_set_link_diag_state *link_diag_state;
        uint32_t req_len, alloc_len;
        int mbxstatus = MBX_SUCCESS, rc;

        pmboxq = mempool_alloc(phba->mbox_mem_pool, GFP_KERNEL);
        if (!pmboxq)
                return -ENOMEM;

        req_len = (sizeof(struct lpfc_mbx_set_link_diag_state) -
                   sizeof(struct lpfc_sli4_cfg_mhdr));
        alloc_len = lpfc_sli4_config(phba, pmboxq, LPFC_MBOX_SUBSYSTEM_FCOE,
                                LPFC_MBOX_OPCODE_FCOE_LINK_DIAG_STATE,
                                req_len, LPFC_SLI4_MBX_EMBED);
        if (alloc_len != req_len) {
                rc = -ENOMEM;
                goto link_diag_state_set_out;
        }
        lpfc_printf_log(phba, KERN_INFO, LOG_LIBDFC,
                        "3128 Set link to diagnostic state:x%x (x%x/x%x)\n",
                        diag, phba->sli4_hba.lnk_info.lnk_tp,
                        phba->sli4_hba.lnk_info.lnk_no);

        link_diag_state = &pmboxq->u.mqe.un.link_diag_state;
        bf_set(lpfc_mbx_set_diag_state_diag_bit_valid, &link_diag_state->u.req,
               LPFC_DIAG_STATE_DIAG_BIT_VALID_CHANGE);
        bf_set(lpfc_mbx_set_diag_state_link_num, &link_diag_state->u.req,
               phba->sli4_hba.lnk_info.lnk_no);
        bf_set(lpfc_mbx_set_diag_state_link_type, &link_diag_state->u.req,
               phba->sli4_hba.lnk_info.lnk_tp);
        if (diag)
                bf_set(lpfc_mbx_set_diag_state_diag,
                       &link_diag_state->u.req, 1);
        else
                bf_set(lpfc_mbx_set_diag_state_diag,
                       &link_diag_state->u.req, 0);

        mbxstatus = lpfc_sli_issue_mbox_wait(phba, pmboxq, LPFC_MBOX_TMO);

        if ((mbxstatus == MBX_SUCCESS) && (pmboxq->u.mb.mbxStatus == 0))
                rc = 0;
        else
                rc = -ENODEV;

link_diag_state_set_out:
        if (pmboxq && (mbxstatus != MBX_TIMEOUT))
                mempool_free(pmboxq, phba->mbox_mem_pool);

        return rc;
}

/**
 * lpfc_sli4_bsg_set_internal_loopback - set sli4 internal loopback diagnostic
 * @phba: Pointer to HBA context object.
 *
 * This function is responsible for issuing a sli4 mailbox command for setting
 * up internal loopback diagnostic.
 */
static int
lpfc_sli4_bsg_set_internal_loopback(struct lpfc_hba *phba)
{
        LPFC_MBOXQ_t *pmboxq;
        uint32_t req_len, alloc_len;
        struct lpfc_mbx_set_link_diag_loopback *link_diag_loopback;
        int mbxstatus = MBX_SUCCESS, rc = 0;

        pmboxq = mempool_alloc(phba->mbox_mem_pool, GFP_KERNEL);
        if (!pmboxq)
                return -ENOMEM;
        req_len = (sizeof(struct lpfc_mbx_set_link_diag_loopback) -
                   sizeof(struct lpfc_sli4_cfg_mhdr));
        alloc_len = lpfc_sli4_config(phba, pmboxq, LPFC_MBOX_SUBSYSTEM_FCOE,
                                LPFC_MBOX_OPCODE_FCOE_LINK_DIAG_LOOPBACK,
                                req_len, LPFC_SLI4_MBX_EMBED);
        if (alloc_len != req_len) {
                mempool_free(pmboxq, phba->mbox_mem_pool);
                return -ENOMEM;
        }
        link_diag_loopback = &pmboxq->u.mqe.un.link_diag_loopback;
        bf_set(lpfc_mbx_set_diag_state_link_num,
               &link_diag_loopback->u.req, phba->sli4_hba.lnk_info.lnk_no);
        bf_set(lpfc_mbx_set_diag_state_link_type,
               &link_diag_loopback->u.req, phba->sli4_hba.lnk_info.lnk_tp);
        bf_set(lpfc_mbx_set_diag_lpbk_type, &link_diag_loopback->u.req,
               LPFC_DIAG_LOOPBACK_TYPE_INTERNAL);

        mbxstatus = lpfc_sli_issue_mbox_wait(phba, pmboxq, LPFC_MBOX_TMO);
        if ((mbxstatus != MBX_SUCCESS) || (pmboxq->u.mb.mbxStatus)) {
                lpfc_printf_log(phba, KERN_WARNING, LOG_LIBDFC,
                                "3127 Failed setup loopback mode mailbox "
                                "command, rc:x%x, status:x%x\n", mbxstatus,
                                pmboxq->u.mb.mbxStatus);
                rc = -ENODEV;
        }
        if (pmboxq && (mbxstatus != MBX_TIMEOUT))
                mempool_free(pmboxq, phba->mbox_mem_pool);
        return rc;
}

/**
 * lpfc_sli4_diag_fcport_reg_setup - setup port registrations for diagnostic
 * @phba: Pointer to HBA context object.
 *
 * This function set up SLI4 FC port registrations for diagnostic run, which
 * includes all the rpis, vfi, and also vpi.
 */
static int
lpfc_sli4_diag_fcport_reg_setup(struct lpfc_hba *phba)
{
        int rc;

        if (phba->pport->fc_flag & FC_VFI_REGISTERED) {
                lpfc_printf_log(phba, KERN_WARNING, LOG_LIBDFC,
                                "3136 Port still had vfi registered: "
                                "mydid:x%x, fcfi:%d, vfi:%d, vpi:%d\n",
                                phba->pport->fc_myDID, phba->fcf.fcfi,

                                phba->sli4_hba.vfi_ids[phba->pport->vfi],
                                phba->vpi_ids[phba->pport->vpi]);
                return -EINVAL;
        }
        rc = lpfc_issue_reg_vfi(phba->pport);
        return rc;
}

/**
 * lpfc_sli4_bsg_diag_loopback_mode - process an sli4 bsg vendor command
 * @phba: Pointer to HBA context object.
 * @job: LPFC_BSG_VENDOR_DIAG_MODE
 *
 * This function is responsible for placing an sli4 port into diagnostic
 * loopback mode in order to perform a diagnostic loopback test.
 */
static int
lpfc_sli4_bsg_diag_loopback_mode(struct lpfc_hba *phba, struct fc_bsg_job *job)
{
        struct diag_mode_set *loopback_mode;
        uint32_t link_flags, timeout;
        int i, rc = 0;

        /* no data to return just the return code */
        job->reply->reply_payload_rcv_len = 0;

        if (job->request_len < sizeof(struct fc_bsg_request) +
            sizeof(struct diag_mode_set)) {
                lpfc_printf_log(phba, KERN_WARNING, LOG_LIBDFC,
                                "3011 Received DIAG MODE request size:%d "
                                "below the minimum size:%d\n",
                                job->request_len,
                                (int)(sizeof(struct fc_bsg_request) +
                                sizeof(struct diag_mode_set)));
                rc = -EINVAL;
                goto job_error;
        }

        rc = lpfc_bsg_diag_mode_enter(phba);
        if (rc)
                goto job_error;

        /* indicate we are in loobpack diagnostic mode */
        spin_lock_irq(&phba->hbalock);
        phba->link_flag |= LS_LOOPBACK_MODE;
        spin_unlock_irq(&phba->hbalock);

        /* reset port to start frome scratch */
        rc = lpfc_selective_reset(phba);
        if (rc)
                goto job_error;

        /* bring the link to diagnostic mode */
        lpfc_printf_log(phba, KERN_INFO, LOG_LIBDFC,
                        "3129 Bring link to diagnostic state.\n");
        loopback_mode = (struct diag_mode_set *)
                job->request->rqst_data.h_vendor.vendor_cmd;
        link_flags = loopback_mode->type;
        timeout = loopback_mode->timeout * 100;

        rc = lpfc_sli4_bsg_set_link_diag_state(phba, 1);
        if (rc) {
                lpfc_printf_log(phba, KERN_WARNING, LOG_LIBDFC,
                                "3130 Failed to bring link to diagnostic "
                                "state, rc:x%x\n", rc);
                goto loopback_mode_exit;
        }

        /* wait for link down before proceeding */
        i = 0;
        while (phba->link_state != LPFC_LINK_DOWN) {
                if (i++ > timeout) {
                        rc = -ETIMEDOUT;
                        lpfc_printf_log(phba, KERN_INFO, LOG_LIBDFC,
                                        "3131 Timeout waiting for link to "
                                        "diagnostic mode, timeout:%d ms\n",
                                        timeout * 10);
                        goto loopback_mode_exit;
                }
                msleep(10);
        }

        /* set up loopback mode */
        lpfc_printf_log(phba, KERN_INFO, LOG_LIBDFC,
                        "3132 Set up loopback mode:x%x\n", link_flags);

        if (link_flags == INTERNAL_LOOP_BACK)
                rc = lpfc_sli4_bsg_set_internal_loopback(phba);
        else if (link_flags == EXTERNAL_LOOP_BACK)
                rc = lpfc_hba_init_link_fc_topology(phba,
                                                    FLAGS_TOPOLOGY_MODE_PT_PT,
                                                    MBX_NOWAIT);
        else {
                rc = -EINVAL;
                lpfc_printf_log(phba, KERN_ERR, LOG_LIBDFC,
                                "3141 Loopback mode:x%x not supported\n",
                                link_flags);
                goto loopback_mode_exit;
        }

        if (!rc) {
                /* wait for the link attention interrupt */
                msleep(100);
                i = 0;
                while (phba->link_state < LPFC_LINK_UP) {
                        if (i++ > timeout) {
                                rc = -ETIMEDOUT;
                                lpfc_printf_log(phba, KERN_INFO, LOG_LIBDFC,
                                        "3137 Timeout waiting for link up "
                                        "in loopback mode, timeout:%d ms\n",
                                        timeout * 10);
                                break;
                        }
                        msleep(10);
                }
        }

        /* port resource registration setup for loopback diagnostic */
        if (!rc) {
                /* set up a none zero myDID for loopback test */
                phba->pport->fc_myDID = 1;
                rc = lpfc_sli4_diag_fcport_reg_setup(phba);
        } else
                goto loopback_mode_exit;

        if (!rc) {
                /* wait for the port ready */
                msleep(100);
                i = 0;
                while (phba->link_state != LPFC_HBA_READY) {
                        if (i++ > timeout) {
                                rc = -ETIMEDOUT;
                                lpfc_printf_log(phba, KERN_INFO, LOG_LIBDFC,
                                        "3133 Timeout waiting for port "
                                        "loopback mode ready, timeout:%d ms\n",
                                        timeout * 10);
                                break;
                        }
                        msleep(10);
                }
        }

loopback_mode_exit:
        /* clear loopback diagnostic mode */
        if (rc) {
                spin_lock_irq(&phba->hbalock);
                phba->link_flag &= ~LS_LOOPBACK_MODE;
                spin_unlock_irq(&phba->hbalock);
        }
        lpfc_bsg_diag_mode_exit(phba);

job_error:
        /* make error code available to userspace */
        job->reply->result = rc;
        /* complete the job back to userspace if no error */
        if (rc == 0)
                job->job_done(job);
        return rc;
}

/**
 * lpfc_bsg_diag_loopback_mode - bsg vendor command for diag loopback mode
 * @job: LPFC_BSG_VENDOR_DIAG_MODE
 *
 * This function is responsible for responding to check and dispatch bsg diag
 * command from the user to proper driver action routines.
 */
static int
lpfc_bsg_diag_loopback_mode(struct fc_bsg_job *job)
{
        struct Scsi_Host *shost;
        struct lpfc_vport *vport;
        struct lpfc_hba *phba;
        int rc;

        shost = job->shost;
        if (!shost)
                return -ENODEV;
        vport = (struct lpfc_vport *)job->shost->hostdata;
        if (!vport)
                return -ENODEV;
        phba = vport->phba;
        if (!phba)
                return -ENODEV;

        if (phba->sli_rev < LPFC_SLI_REV4)
                rc = lpfc_sli3_bsg_diag_loopback_mode(phba, job);
        else if (bf_get(lpfc_sli_intf_if_type, &phba->sli4_hba.sli_intf) ==
                 LPFC_SLI_INTF_IF_TYPE_2)
                rc = lpfc_sli4_bsg_diag_loopback_mode(phba, job);
        else
                rc = -ENODEV;

        return rc;
}

/**
 * lpfc_sli4_bsg_diag_mode_end - sli4 bsg vendor command for ending diag mode
 * @job: LPFC_BSG_VENDOR_DIAG_MODE_END
 *
 * This function is responsible for responding to check and dispatch bsg diag
 * command from the user to proper driver action routines.
 */
static int
lpfc_sli4_bsg_diag_mode_end(struct fc_bsg_job *job)
{
        struct Scsi_Host *shost;
        struct lpfc_vport *vport;
        struct lpfc_hba *phba;
        struct diag_mode_set *loopback_mode_end_cmd;
        uint32_t timeout;
        int rc, i;

        shost = job->shost;
        if (!shost)
                return -ENODEV;
        vport = (struct lpfc_vport *)job->shost->hostdata;
        if (!vport)
                return -ENODEV;
        phba = vport->phba;
        if (!phba)
                return -ENODEV;

        if (phba->sli_rev < LPFC_SLI_REV4)
                return -ENODEV;
        if (bf_get(lpfc_sli_intf_if_type, &phba->sli4_hba.sli_intf) !=
            LPFC_SLI_INTF_IF_TYPE_2)
                return -ENODEV;

        /* clear loopback diagnostic mode */
        spin_lock_irq(&phba->hbalock);
        phba->link_flag &= ~LS_LOOPBACK_MODE;
        spin_unlock_irq(&phba->hbalock);
        loopback_mode_end_cmd = (struct diag_mode_set *)
                        job->request->rqst_data.h_vendor.vendor_cmd;
        timeout = loopback_mode_end_cmd->timeout * 100;

        rc = lpfc_sli4_bsg_set_link_diag_state(phba, 0);
        if (rc) {
                lpfc_printf_log(phba, KERN_WARNING, LOG_LIBDFC,
                                "3139 Failed to bring link to diagnostic "
                                "state, rc:x%x\n", rc);
                goto loopback_mode_end_exit;
        }

        /* wait for link down before proceeding */
        i = 0;
        while (phba->link_state != LPFC_LINK_DOWN) {
                if (i++ > timeout) {
                        lpfc_printf_log(phba, KERN_INFO, LOG_LIBDFC,
                                        "3140 Timeout waiting for link to "
                                        "diagnostic mode_end, timeout:%d ms\n",
                                        timeout * 10);
                        /* there is nothing much we can do here */
                        break;
                }
                msleep(10);
        }

        /* reset port resource registrations */
        rc = lpfc_selective_reset(phba);
        phba->pport->fc_myDID = 0;

loopback_mode_end_exit:
        /* make return code available to userspace */
        job->reply->result = rc;
        /* complete the job back to userspace if no error */
        if (rc == 0)
                job->job_done(job);
        return rc;
}

/**
 * lpfc_sli4_bsg_link_diag_test - sli4 bsg vendor command for diag link test
 * @job: LPFC_BSG_VENDOR_DIAG_LINK_TEST
 *
 * This function is to perform SLI4 diag link test request from the user
 * applicaiton.
 */
static int
lpfc_sli4_bsg_link_diag_test(struct fc_bsg_job *job)
{
        struct Scsi_Host *shost;
        struct lpfc_vport *vport;
        struct lpfc_hba *phba;
        LPFC_MBOXQ_t *pmboxq;
        struct sli4_link_diag *link_diag_test_cmd;
        uint32_t req_len, alloc_len;
        struct lpfc_mbx_run_link_diag_test *run_link_diag_test;
        union lpfc_sli4_cfg_shdr *shdr;
        uint32_t shdr_status, shdr_add_status;
        struct diag_status *diag_status_reply;
        int mbxstatus, rc = 0;

        shost = job->shost;
        if (!shost) {
                rc = -ENODEV;
                goto job_error;
        }
        vport = (struct lpfc_vport *)job->shost->hostdata;
        if (!vport) {
                rc = -ENODEV;
                goto job_error;
        }
        phba = vport->phba;
        if (!phba) {
                rc = -ENODEV;
                goto job_error;
        }

        if (phba->sli_rev < LPFC_SLI_REV4) {
                rc = -ENODEV;
                goto job_error;
        }
        if (bf_get(lpfc_sli_intf_if_type, &phba->sli4_hba.sli_intf) !=
            LPFC_SLI_INTF_IF_TYPE_2) {
                rc = -ENODEV;
                goto job_error;
        }

        if (job->request_len < sizeof(struct fc_bsg_request) +
            sizeof(struct sli4_link_diag)) {
                lpfc_printf_log(phba, KERN_WARNING, LOG_LIBDFC,
                                "3013 Received LINK DIAG TEST request "
                                " size:%d below the minimum size:%d\n",
                                job->request_len,
                                (int)(sizeof(struct fc_bsg_request) +
                                sizeof(struct sli4_link_diag)));
                rc = -EINVAL;
                goto job_error;
        }

        rc = lpfc_bsg_diag_mode_enter(phba);
        if (rc)
                goto job_error;

        link_diag_test_cmd = (struct sli4_link_diag *)
                         job->request->rqst_data.h_vendor.vendor_cmd;

        rc = lpfc_sli4_bsg_set_link_diag_state(phba, 1);

        if (rc)
                goto job_error;

        pmboxq = mempool_alloc(phba->mbox_mem_pool, GFP_KERNEL);
        if (!pmboxq) {
                rc = -ENOMEM;
                goto link_diag_test_exit;
        }

        req_len = (sizeof(struct lpfc_mbx_set_link_diag_state) -
                   sizeof(struct lpfc_sli4_cfg_mhdr));
        alloc_len = lpfc_sli4_config(phba, pmboxq, LPFC_MBOX_SUBSYSTEM_FCOE,
                                     LPFC_MBOX_OPCODE_FCOE_LINK_DIAG_STATE,
                                     req_len, LPFC_SLI4_MBX_EMBED);
        if (alloc_len != req_len) {
                rc = -ENOMEM;
                goto link_diag_test_exit;
        }
        run_link_diag_test = &pmboxq->u.mqe.un.link_diag_test;
        bf_set(lpfc_mbx_run_diag_test_link_num, &run_link_diag_test->u.req,
               phba->sli4_hba.lnk_info.lnk_no);
        bf_set(lpfc_mbx_run_diag_test_link_type, &run_link_diag_test->u.req,
               phba->sli4_hba.lnk_info.lnk_tp);
        bf_set(lpfc_mbx_run_diag_test_test_id, &run_link_diag_test->u.req,
               link_diag_test_cmd->test_id);
        bf_set(lpfc_mbx_run_diag_test_loops, &run_link_diag_test->u.req,
               link_diag_test_cmd->loops);
        bf_set(lpfc_mbx_run_diag_test_test_ver, &run_link_diag_test->u.req,
               link_diag_test_cmd->test_version);
        bf_set(lpfc_mbx_run_diag_test_err_act, &run_link_diag_test->u.req,
               link_diag_test_cmd->error_action);

        mbxstatus = lpfc_sli_issue_mbox(phba, pmboxq, MBX_POLL);

        shdr = (union lpfc_sli4_cfg_shdr *)
                &pmboxq->u.mqe.un.sli4_config.header.cfg_shdr;
        shdr_status = bf_get(lpfc_mbox_hdr_status, &shdr->response);
        shdr_add_status = bf_get(lpfc_mbox_hdr_add_status, &shdr->response);
        if (shdr_status || shdr_add_status || mbxstatus) {
                lpfc_printf_log(phba, KERN_ERR, LOG_LIBDFC,
                                "3010 Run link diag test mailbox failed with "
                                "mbx_status x%x status x%x, add_status x%x\n",
                                mbxstatus, shdr_status, shdr_add_status);
        }

        diag_status_reply = (struct diag_status *)
                            job->reply->reply_data.vendor_reply.vendor_rsp;

        if (job->reply_len <
            sizeof(struct fc_bsg_request) + sizeof(struct diag_status)) {
                lpfc_printf_log(phba, KERN_WARNING, LOG_LIBDFC,
                                "3012 Received Run link diag test reply "
                                "below minimum size (%d): reply_len:%d\n",
                                (int)(sizeof(struct fc_bsg_request) +
                                sizeof(struct diag_status)),
                                job->reply_len);
                rc = -EINVAL;
                goto job_error;
        }

        diag_status_reply->mbox_status = mbxstatus;
        diag_status_reply->shdr_status = shdr_status;
        diag_status_reply->shdr_add_status = shdr_add_status;

link_diag_test_exit:
        rc = lpfc_sli4_bsg_set_link_diag_state(phba, 0);

        if (pmboxq)
                mempool_free(pmboxq, phba->mbox_mem_pool);

        lpfc_bsg_diag_mode_exit(phba);

job_error:
        /* make error code available to userspace */
        job->reply->result = rc;
        /* complete the job back to userspace if no error */
        if (rc == 0)
                job->job_done(job);
        return rc;
}

/**
 * lpfcdiag_loop_self_reg - obtains a remote port login id
 * @phba: Pointer to HBA context object
 * @rpi: Pointer to a remote port login id
 *
 * This function obtains a remote port login id so the diag loopback test
 * can send and receive its own unsolicited CT command.
 **/
static int lpfcdiag_loop_self_reg(struct lpfc_hba *phba, uint16_t *rpi)
{
        LPFC_MBOXQ_t *mbox;
        struct lpfc_dmabuf *dmabuff;
        int status;

        mbox = mempool_alloc(phba->mbox_mem_pool, GFP_KERNEL);
        if (!mbox)
                return -ENOMEM;

        if (phba->sli_rev < LPFC_SLI_REV4)
                status = lpfc_reg_rpi(phba, 0, phba->pport->fc_myDID,
                                (uint8_t *)&phba->pport->fc_sparam,
                                mbox, *rpi);
        else {
                *rpi = lpfc_sli4_alloc_rpi(phba);
                status = lpfc_reg_rpi(phba, phba->pport->vpi,
                                phba->pport->fc_myDID,
                                (uint8_t *)&phba->pport->fc_sparam,
                                mbox, *rpi);
        }

        if (status) {
                mempool_free(mbox, phba->mbox_mem_pool);
                if (phba->sli_rev == LPFC_SLI_REV4)
                        lpfc_sli4_free_rpi(phba, *rpi);
                return -ENOMEM;
        }

        dmabuff = (struct lpfc_dmabuf *) mbox->context1;
        mbox->context1 = NULL;
        mbox->context2 = NULL;
        status = lpfc_sli_issue_mbox_wait(phba, mbox, LPFC_MBOX_TMO);

        if ((status != MBX_SUCCESS) || (mbox->u.mb.mbxStatus)) {
                lpfc_mbuf_free(phba, dmabuff->virt, dmabuff->phys);
                kfree(dmabuff);
                if (status != MBX_TIMEOUT)
                        mempool_free(mbox, phba->mbox_mem_pool);
                if (phba->sli_rev == LPFC_SLI_REV4)
                        lpfc_sli4_free_rpi(phba, *rpi);
                return -ENODEV;
        }

        if (phba->sli_rev < LPFC_SLI_REV4)
                *rpi = mbox->u.mb.un.varWords[0];

        lpfc_mbuf_free(phba, dmabuff->virt, dmabuff->phys);
        kfree(dmabuff);
        mempool_free(mbox, phba->mbox_mem_pool);
        return 0;
}

/**
 * lpfcdiag_loop_self_unreg - unregs from the rpi
 * @phba: Pointer to HBA context object
 * @rpi: Remote port login id
 *
 * This function unregisters the rpi obtained in lpfcdiag_loop_self_reg
 **/
static int lpfcdiag_loop_self_unreg(struct lpfc_hba *phba, uint16_t rpi)
{
        LPFC_MBOXQ_t *mbox;
        int status;

        /* Allocate mboxq structure */
        mbox = mempool_alloc(phba->mbox_mem_pool, GFP_KERNEL);
        if (mbox == NULL)
                return -ENOMEM;

        if (phba->sli_rev < LPFC_SLI_REV4)
                lpfc_unreg_login(phba, 0, rpi, mbox);
        else
                lpfc_unreg_login(phba, phba->pport->vpi,
                                 phba->sli4_hba.rpi_ids[rpi], mbox);

        status = lpfc_sli_issue_mbox_wait(phba, mbox, LPFC_MBOX_TMO);

        if ((status != MBX_SUCCESS) || (mbox->u.mb.mbxStatus)) {
                if (status != MBX_TIMEOUT)
                        mempool_free(mbox, phba->mbox_mem_pool);
                return -EIO;
        }
        mempool_free(mbox, phba->mbox_mem_pool);
        if (phba->sli_rev == LPFC_SLI_REV4)
                lpfc_sli4_free_rpi(phba, rpi);
        return 0;
}

/**
 * lpfcdiag_loop_get_xri - obtains the transmit and receive ids
 * @phba: Pointer to HBA context object
 * @rpi: Remote port login id
 * @txxri: Pointer to transmit exchange id
 * @rxxri: Pointer to response exchabge id
 *
 * This function obtains the transmit and receive ids required to send
 * an unsolicited ct command with a payload. A special lpfc FsType and CmdRsp
 * flags are used to the unsolicted response handler is able to process
 * the ct command sent on the same port.
 **/
static int lpfcdiag_loop_get_xri(struct lpfc_hba *phba, uint16_t rpi,
                         uint16_t *txxri, uint16_t * rxxri)
{
        struct lpfc_bsg_event *evt;
        struct lpfc_iocbq *cmdiocbq, *rspiocbq;
        IOCB_t *cmd, *rsp;
        struct lpfc_dmabuf *dmabuf;
        struct ulp_bde64 *bpl = NULL;
        struct lpfc_sli_ct_request *ctreq = NULL;
        int ret_val = 0;
        int time_left;
        int iocb_stat = IOCB_SUCCESS;
        unsigned long flags;

        *txxri = 0;
        *rxxri = 0;
        evt = lpfc_bsg_event_new(FC_REG_CT_EVENT, current->pid,
                                SLI_CT_ELX_LOOPBACK);
        if (!evt)
                return -ENOMEM;

        spin_lock_irqsave(&phba->ct_ev_lock, flags);
        list_add(&evt->node, &phba->ct_ev_waiters);
        lpfc_bsg_event_ref(evt);
        spin_unlock_irqrestore(&phba->ct_ev_lock, flags);

        cmdiocbq = lpfc_sli_get_iocbq(phba);
        rspiocbq = lpfc_sli_get_iocbq(phba);

        dmabuf = kmalloc(sizeof(struct lpfc_dmabuf), GFP_KERNEL);
        if (dmabuf) {
                dmabuf->virt = lpfc_mbuf_alloc(phba, 0, &dmabuf->phys);
                if (dmabuf->virt) {
                        INIT_LIST_HEAD(&dmabuf->list);
                        bpl = (struct ulp_bde64 *) dmabuf->virt;
                        memset(bpl, 0, sizeof(*bpl));
                        ctreq = (struct lpfc_sli_ct_request *)(bpl + 1);
                        bpl->addrHigh =
                                le32_to_cpu(putPaddrHigh(dmabuf->phys +
                                        sizeof(*bpl)));
                        bpl->addrLow =
                                le32_to_cpu(putPaddrLow(dmabuf->phys +
                                        sizeof(*bpl)));
                        bpl->tus.f.bdeFlags = 0;
                        bpl->tus.f.bdeSize = ELX_LOOPBACK_HEADER_SZ;
                        bpl->tus.w = le32_to_cpu(bpl->tus.w);
                }
        }

        if (cmdiocbq == NULL || rspiocbq == NULL ||
            dmabuf == NULL || bpl == NULL || ctreq == NULL ||
                dmabuf->virt == NULL) {
                ret_val = -ENOMEM;
                goto err_get_xri_exit;
        }

        cmd = &cmdiocbq->iocb;
        rsp = &rspiocbq->iocb;

        memset(ctreq, 0, ELX_LOOPBACK_HEADER_SZ);

        ctreq->RevisionId.bits.Revision = SLI_CT_REVISION;
        ctreq->RevisionId.bits.InId = 0;
        ctreq->FsType = SLI_CT_ELX_LOOPBACK;
        ctreq->FsSubType = 0;
        ctreq->CommandResponse.bits.CmdRsp = ELX_LOOPBACK_XRI_SETUP;
        ctreq->CommandResponse.bits.Size = 0;


        cmd->un.xseq64.bdl.addrHigh = putPaddrHigh(dmabuf->phys);
        cmd->un.xseq64.bdl.addrLow = putPaddrLow(dmabuf->phys);
        cmd->un.xseq64.bdl.bdeFlags = BUFF_TYPE_BLP_64;
        cmd->un.xseq64.bdl.bdeSize = sizeof(*bpl);

        cmd->un.xseq64.w5.hcsw.Fctl = LA;
        cmd->un.xseq64.w5.hcsw.Dfctl = 0;
        cmd->un.xseq64.w5.hcsw.Rctl = FC_RCTL_DD_UNSOL_CTL;
        cmd->un.xseq64.w5.hcsw.Type = FC_TYPE_CT;

        cmd->ulpCommand = CMD_XMIT_SEQUENCE64_CR;
        cmd->ulpBdeCount = 1;
        cmd->ulpLe = 1;
        cmd->ulpClass = CLASS3;
        cmd->ulpContext = rpi;

        cmdiocbq->iocb_flag |= LPFC_IO_LIBDFC;
        cmdiocbq->vport = phba->pport;
        cmdiocbq->iocb_cmpl = NULL;

        iocb_stat = lpfc_sli_issue_iocb_wait(phba, LPFC_ELS_RING, cmdiocbq,
                                rspiocbq,
                                (phba->fc_ratov * 2)
                                + LPFC_DRVR_TIMEOUT);
        if ((iocb_stat != IOCB_SUCCESS) || (rsp->ulpStatus != IOSTAT_SUCCESS)) {
                ret_val = -EIO;
                goto err_get_xri_exit;
        }
        *txxri =  rsp->ulpContext;

        evt->waiting = 1;
        evt->wait_time_stamp = jiffies;
        time_left = wait_event_interruptible_timeout(
                evt->wq, !list_empty(&evt->events_to_see),
                msecs_to_jiffies(1000 *
                        ((phba->fc_ratov * 2) + LPFC_DRVR_TIMEOUT)));
        if (list_empty(&evt->events_to_see))
                ret_val = (time_left) ? -EINTR : -ETIMEDOUT;
        else {
                spin_lock_irqsave(&phba->ct_ev_lock, flags);
                list_move(evt->events_to_see.prev, &evt->events_to_get);
                spin_unlock_irqrestore(&phba->ct_ev_lock, flags);
                *rxxri = (list_entry(evt->events_to_get.prev,
                                     typeof(struct event_data),
                                     node))->immed_dat;
        }
        evt->waiting = 0;

err_get_xri_exit:
        spin_lock_irqsave(&phba->ct_ev_lock, flags);
        lpfc_bsg_event_unref(evt); /* release ref */
        lpfc_bsg_event_unref(evt); /* delete */
        spin_unlock_irqrestore(&phba->ct_ev_lock, flags);

        if (dmabuf) {
                if (dmabuf->virt)
                        lpfc_mbuf_free(phba, dmabuf->virt, dmabuf->phys);
                kfree(dmabuf);
        }

        if (cmdiocbq && (iocb_stat != IOCB_TIMEDOUT))
                lpfc_sli_release_iocbq(phba, cmdiocbq);
        if (rspiocbq)
                lpfc_sli_release_iocbq(phba, rspiocbq);
        return ret_val;
}

/**
 * lpfc_bsg_dma_page_alloc - allocate a bsg mbox page sized dma buffers
 * @phba: Pointer to HBA context object
 *
 * This function allocates BSG_MBOX_SIZE (4KB) page size dma buffer and.
 * returns the pointer to the buffer.
 **/
static struct lpfc_dmabuf *
lpfc_bsg_dma_page_alloc(struct lpfc_hba *phba)
{
        struct lpfc_dmabuf *dmabuf;
        struct pci_dev *pcidev = phba->pcidev;

        /* allocate dma buffer struct */
        dmabuf = kmalloc(sizeof(struct lpfc_dmabuf), GFP_KERNEL);
        if (!dmabuf)
                return NULL;

        INIT_LIST_HEAD(&dmabuf->list);

        /* now, allocate dma buffer */
        dmabuf->virt = dma_zalloc_coherent(&pcidev->dev, BSG_MBOX_SIZE,
                                           &(dmabuf->phys), GFP_KERNEL);

        if (!dmabuf->virt) {
                kfree(dmabuf);
                return NULL;
        }

        return dmabuf;
}

/**
 * lpfc_bsg_dma_page_free - free a bsg mbox page sized dma buffer
 * @phba: Pointer to HBA context object.
 * @dmabuf: Pointer to the bsg mbox page sized dma buffer descriptor.
 *
 * This routine just simply frees a dma buffer and its associated buffer
 * descriptor referred by @dmabuf.
 **/
static void
lpfc_bsg_dma_page_free(struct lpfc_hba *phba, struct lpfc_dmabuf *dmabuf)
{
        struct pci_dev *pcidev = phba->pcidev;

        if (!dmabuf)
                return;

        if (dmabuf->virt)
                dma_free_coherent(&pcidev->dev, BSG_MBOX_SIZE,
                                  dmabuf->virt, dmabuf->phys);
        kfree(dmabuf);
        return;
}

/**
 * lpfc_bsg_dma_page_list_free - free a list of bsg mbox page sized dma buffers
 * @phba: Pointer to HBA context object.
 * @dmabuf_list: Pointer to a list of bsg mbox page sized dma buffer descs.
 *
 * This routine just simply frees all dma buffers and their associated buffer
 * descriptors referred by @dmabuf_list.
 **/
static void
lpfc_bsg_dma_page_list_free(struct lpfc_hba *phba,
                            struct list_head *dmabuf_list)
{
        struct lpfc_dmabuf *dmabuf, *next_dmabuf;

        if (list_empty(dmabuf_list))
                return;

        list_for_each_entry_safe(dmabuf, next_dmabuf, dmabuf_list, list) {
                list_del_init(&dmabuf->list);
                lpfc_bsg_dma_page_free(phba, dmabuf);
        }
        return;
}

/**
 * diag_cmd_data_alloc - fills in a bde struct with dma buffers
 * @phba: Pointer to HBA context object
 * @bpl: Pointer to 64 bit bde structure
 * @size: Number of bytes to process
 * @nocopydata: Flag to copy user data into the allocated buffer
 *
 * This function allocates page size buffers and populates an lpfc_dmabufext.
 * If allowed the user data pointed to with indataptr is copied into the kernel
 * memory. The chained list of page size buffers is returned.
 **/
static struct lpfc_dmabufext *
diag_cmd_data_alloc(struct lpfc_hba *phba,
                   struct ulp_bde64 *bpl, uint32_t size,
                   int nocopydata)
{
        struct lpfc_dmabufext *mlist = NULL;
        struct lpfc_dmabufext *dmp;
        int cnt, offset = 0, i = 0;
        struct pci_dev *pcidev;

        pcidev = phba->pcidev;

        while (size) {
                /* We get chunks of 4K */
                if (size > BUF_SZ_4K)
                        cnt = BUF_SZ_4K;
                else
                        cnt = size;

                /* allocate struct lpfc_dmabufext buffer header */
                dmp = kmalloc(sizeof(struct lpfc_dmabufext), GFP_KERNEL);
                if (!dmp)
                        goto out;

                INIT_LIST_HEAD(&dmp->dma.list);

                /* Queue it to a linked list */
                if (mlist)
                        list_add_tail(&dmp->dma.list, &mlist->dma.list);
                else
                        mlist = dmp;

                /* allocate buffer */
                dmp->dma.virt = dma_alloc_coherent(&pcidev->dev,
                                                   cnt,
                                                   &(dmp->dma.phys),
                                                   GFP_KERNEL);

                if (!dmp->dma.virt)
                        goto out;

                dmp->size = cnt;

                if (nocopydata) {
                        bpl->tus.f.bdeFlags = 0;
                        pci_dma_sync_single_for_device(phba->pcidev,
                                dmp->dma.phys, LPFC_BPL_SIZE, PCI_DMA_TODEVICE);

                } else {
                        memset((uint8_t *)dmp->dma.virt, 0, cnt);
                        bpl->tus.f.bdeFlags = BUFF_TYPE_BDE_64I;
                }

                /* build buffer ptr list for IOCB */
                bpl->addrLow = le32_to_cpu(putPaddrLow(dmp->dma.phys));
                bpl->addrHigh = le32_to_cpu(putPaddrHigh(dmp->dma.phys));
                bpl->tus.f.bdeSize = (ushort) cnt;
                bpl->tus.w = le32_to_cpu(bpl->tus.w);
                bpl++;

                i++;
                offset += cnt;
                size -= cnt;
        }

        if (mlist) {
                mlist->flag = i;
                return mlist;
        }
out:
        diag_cmd_data_free(phba, mlist);
        return NULL;
}

/**
 * lpfcdiag_loop_post_rxbufs - post the receive buffers for an unsol CT cmd
 * @phba: Pointer to HBA context object
 * @rxxri: Receive exchange id
 * @len: Number of data bytes
 *
 * This function allocates and posts a data buffer of sufficient size to receive
 * an unsolicted CT command.
 **/
static int lpfcdiag_loop_post_rxbufs(struct lpfc_hba *phba, uint16_t rxxri,
                             size_t len)
{
        struct lpfc_sli *psli = &phba->sli;
        struct lpfc_sli_ring *pring = &psli->ring[LPFC_ELS_RING];
        struct lpfc_iocbq *cmdiocbq;
        IOCB_t *cmd = NULL;
        struct list_head head, *curr, *next;
        struct lpfc_dmabuf *rxbmp;
        struct lpfc_dmabuf *dmp;
        struct lpfc_dmabuf *mp[2] = {NULL, NULL};
        struct ulp_bde64 *rxbpl = NULL;
        uint32_t num_bde;
        struct lpfc_dmabufext *rxbuffer = NULL;
        int ret_val = 0;
        int iocb_stat;
        int i = 0;

        cmdiocbq = lpfc_sli_get_iocbq(phba);
        rxbmp = kmalloc(sizeof(struct lpfc_dmabuf), GFP_KERNEL);
        if (rxbmp != NULL) {
                rxbmp->virt = lpfc_mbuf_alloc(phba, 0, &rxbmp->phys);
                if (rxbmp->virt) {
                        INIT_LIST_HEAD(&rxbmp->list);
                        rxbpl = (struct ulp_bde64 *) rxbmp->virt;
                        rxbuffer = diag_cmd_data_alloc(phba, rxbpl, len, 0);
                }
        }

        if (!cmdiocbq || !rxbmp || !rxbpl || !rxbuffer) {
                ret_val = -ENOMEM;
                goto err_post_rxbufs_exit;
        }

        /* Queue buffers for the receive exchange */
        num_bde = (uint32_t)rxbuffer->flag;
        dmp = &rxbuffer->dma;

        cmd = &cmdiocbq->iocb;
        i = 0;

        INIT_LIST_HEAD(&head);
        list_add_tail(&head, &dmp->list);
        list_for_each_safe(curr, next, &head) {
                mp[i] = list_entry(curr, struct lpfc_dmabuf, list);
                list_del(curr);

                if (phba->sli3_options & LPFC_SLI3_HBQ_ENABLED) {
                        mp[i]->buffer_tag = lpfc_sli_get_buffer_tag(phba);
                        cmd->un.quexri64cx.buff.bde.addrHigh =
                                putPaddrHigh(mp[i]->phys);
                        cmd->un.quexri64cx.buff.bde.addrLow =
                                putPaddrLow(mp[i]->phys);
                        cmd->un.quexri64cx.buff.bde.tus.f.bdeSize =
                                ((struct lpfc_dmabufext *)mp[i])->size;
                        cmd->un.quexri64cx.buff.buffer_tag = mp[i]->buffer_tag;
                        cmd->ulpCommand = CMD_QUE_XRI64_CX;
                        cmd->ulpPU = 0;
                        cmd->ulpLe = 1;
                        cmd->ulpBdeCount = 1;
                        cmd->unsli3.que_xri64cx_ext_words.ebde_count = 0;

                } else {
                        cmd->un.cont64[i].addrHigh = putPaddrHigh(mp[i]->phys);
                        cmd->un.cont64[i].addrLow = putPaddrLow(mp[i]->phys);
                        cmd->un.cont64[i].tus.f.bdeSize =
                                ((struct lpfc_dmabufext *)mp[i])->size;
                                        cmd->ulpBdeCount = ++i;

                        if ((--num_bde > 0) && (i < 2))
                                continue;

                        cmd->ulpCommand = CMD_QUE_XRI_BUF64_CX;
                        cmd->ulpLe = 1;
                }

                cmd->ulpClass = CLASS3;
                cmd->ulpContext = rxxri;

                iocb_stat = lpfc_sli_issue_iocb(phba, LPFC_ELS_RING, cmdiocbq,
                                                0);
                if (iocb_stat == IOCB_ERROR) {
                        diag_cmd_data_free(phba,
                                (struct lpfc_dmabufext *)mp[0]);
                        if (mp[1])
                                diag_cmd_data_free(phba,
                                          (struct lpfc_dmabufext *)mp[1]);
                        dmp = list_entry(next, struct lpfc_dmabuf, list);
                        ret_val = -EIO;
                        goto err_post_rxbufs_exit;
                }

                lpfc_sli_ringpostbuf_put(phba, pring, mp[0]);
                if (mp[1]) {
                        lpfc_sli_ringpostbuf_put(phba, pring, mp[1]);
                        mp[1] = NULL;
                }

                /* The iocb was freed by lpfc_sli_issue_iocb */
                cmdiocbq = lpfc_sli_get_iocbq(phba);
                if (!cmdiocbq) {
                        dmp = list_entry(next, struct lpfc_dmabuf, list);
                        ret_val = -EIO;
                        goto err_post_rxbufs_exit;
                }

                cmd = &cmdiocbq->iocb;
                i = 0;
        }
        list_del(&head);

err_post_rxbufs_exit:

        if (rxbmp) {
                if (rxbmp->virt)
                        lpfc_mbuf_free(phba, rxbmp->virt, rxbmp->phys);
                kfree(rxbmp);
        }

        if (cmdiocbq)
                lpfc_sli_release_iocbq(phba, cmdiocbq);
        return ret_val;
}

/**
 * lpfc_bsg_diag_loopback_run - run loopback on a port by issue ct cmd to itself
 * @job: LPFC_BSG_VENDOR_DIAG_TEST fc_bsg_job
 *
 * This function receives a user data buffer to be transmitted and received on
 * the same port, the link must be up and in loopback mode prior
 * to being called.
 * 1. A kernel buffer is allocated to copy the user data into.
 * 2. The port registers with "itself".
 * 3. The transmit and receive exchange ids are obtained.
 * 4. The receive exchange id is posted.
 * 5. A new els loopback event is created.
 * 6. The command and response iocbs are allocated.
 * 7. The cmd iocb FsType is set to elx loopback and the CmdRsp to looppback.
 *
 * This function is meant to be called n times while the port is in loopback
 * so it is the apps responsibility to issue a reset to take the port out
 * of loopback mode.
 **/
static int
lpfc_bsg_diag_loopback_run(struct fc_bsg_job *job)
{
        struct lpfc_vport *vport = (struct lpfc_vport *)job->shost->hostdata;
        struct lpfc_hba *phba = vport->phba;
        struct lpfc_bsg_event *evt;
        struct event_data *evdat;
        struct lpfc_sli *psli = &phba->sli;
        uint32_t size;
        uint32_t full_size;
        size_t segment_len = 0, segment_offset = 0, current_offset = 0;
        uint16_t rpi = 0;
        struct lpfc_iocbq *cmdiocbq, *rspiocbq = NULL;
        IOCB_t *cmd, *rsp = NULL;
        struct lpfc_sli_ct_request *ctreq;
        struct lpfc_dmabuf *txbmp;
        struct ulp_bde64 *txbpl = NULL;