drivers/scsi/lpfc/lpfc_bsg.c

/*******************************************************************
 * This file is part of the Emulex Linux Device Driver for         *
 * Fibre Channel Host Bus Adapters.                                *
 * Copyright (C) 2009-2011 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;

	/* job waiting for this event to finish */
	struct fc_bsg_job *set_job;
};

struct lpfc_bsg_iocb {
	struct lpfc_iocbq *cmdiocbq;
	struct lpfc_iocbq *rspiocbq;
	struct lpfc_dmabuf *bmp;
	struct lpfc_nodelist *ndlp;

	/* job waiting for this iocb to finish */
	struct fc_bsg_job *set_job;
};

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 */

	/* job waiting for this mbox command to finish */
	struct fc_bsg_job *set_job;
};

#define MENLO_DID 0x0000FC0E

struct lpfc_bsg_menlo {
	struct lpfc_iocbq *cmdiocbq;
	struct lpfc_iocbq *rspiocbq;
	struct lpfc_dmabuf *bmp;

	/* job waiting for this iocb to finish */
	struct fc_bsg_job *set_job;
};

#define TYPE_EVT 	1
#define TYPE_IOCB	2
#define TYPE_MBOX	3
#define TYPE_MENLO	4
struct bsg_job_data {
	uint32_t type;
	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;
};

/**
 * 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;
	struct lpfc_nodelist *ndlp;
	struct lpfc_bsg_iocb *iocb;
	unsigned long flags;
	int rc = 0;

	spin_lock_irqsave(&phba->ct_ev_lock, flags);
	dd_data = cmdiocbq->context2;
	if (!dd_data) {
		spin_unlock_irqrestore(&phba->ct_ev_lock, flags);
		lpfc_sli_release_iocbq(phba, cmdiocbq);
		return;
	}

	iocb = &dd_data->context_un.iocb;
	job = iocb->set_job;
	job->dd_data = NULL; /* so timeout handler does not reply */

	bmp = iocb->bmp;
	rsp = &rspiocbq->iocb;
	ndlp = cmdiocbq->context1;

	pci_unmap_sg(phba->pcidev, job->request_payload.sg_list,
		     job->request_payload.sg_cnt, DMA_TO_DEVICE);
	pci_unmap_sg(phba->pcidev, job->reply_payload.sg_list,
		     job->reply_payload.sg_cnt, DMA_FROM_DEVICE);

	if (rsp->ulpStatus) {
		if (rsp->ulpStatus == IOSTAT_LOCAL_REJECT) {
			switch (rsp->un.ulpWord[4] & 0xff) {
			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 =
			rsp->un.genreq64.bdl.bdeSize;

	lpfc_mbuf_free(phba, bmp->virt, bmp->phys);
	lpfc_sli_release_iocbq(phba, cmdiocbq);
	lpfc_nlp_put(ndlp);
	kfree(bmp);
	kfree(dd_data);
	/* make error code available to userspace */
	job->reply->result = rc;
	/* complete the job back to userspace */
	job->job_done(job);
	spin_unlock_irqrestore(&phba->ct_ev_lock, flags);
	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;
	int request_nseg;
	int reply_nseg;
	struct scatterlist *sgel = NULL;
	int numbde;
	dma_addr_t busaddr;
	struct bsg_job_data *dd_data;
	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;
	}

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

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

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

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

	INIT_LIST_HEAD(&bmp->list);
	bpl = (struct ulp_bde64 *) bmp->virt;
	request_nseg = pci_map_sg(phba->pcidev, job->request_payload.sg_list,
				  job->request_payload.sg_cnt, DMA_TO_DEVICE);
	for_each_sg(job->request_payload.sg_list, sgel, request_nseg, numbde) {
		busaddr = sg_dma_address(sgel);
		bpl->tus.f.bdeFlags = BUFF_TYPE_BDE_64;
		bpl->tus.f.bdeSize = sg_dma_len(sgel);
		bpl->tus.w = cpu_to_le32(bpl->tus.w);
		bpl->addrLow = cpu_to_le32(putPaddrLow(busaddr));
		bpl->addrHigh = cpu_to_le32(putPaddrHigh(busaddr));
		bpl++;
	}

	reply_nseg = pci_map_sg(phba->pcidev, job->reply_payload.sg_list,
				job->reply_payload.sg_cnt, DMA_FROM_DEVICE);
	for_each_sg(job->reply_payload.sg_list, sgel, reply_nseg, numbde) {
		busaddr = sg_dma_address(sgel);
		bpl->tus.f.bdeFlags = BUFF_TYPE_BDE_64I;
		bpl->tus.f.bdeSize = sg_dma_len(sgel);
		bpl->tus.w = cpu_to_le32(bpl->tus.w);
		bpl->addrLow = cpu_to_le32(putPaddrLow(busaddr));
		bpl->addrHigh = cpu_to_le32(putPaddrHigh(busaddr));
		bpl++;
	}

	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 = ndlp;
	cmdiocbq->context2 = dd_data;
	dd_data->type = TYPE_IOCB;
	dd_data->context_un.iocb.cmdiocbq = cmdiocbq;
	dd_data->context_un.iocb.set_job = job;
	dd_data->context_un.iocb.bmp = bmp;

	if (phba->cfg_poll & DISABLE_FCP_RING_INT) {
		if (lpfc_readl(phba->HCregaddr, &creg_val)) {
			rc = -EIO ;
			goto free_cmdiocbq;
		}
		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)
		return 0; /* done for now */
	else if (iocb_stat == IOCB_BUSY)
		rc = -EAGAIN;
	else
		rc = -EIO;


	/* iocb failed so cleanup */
	pci_unmap_sg(phba->pcidev, job->request_payload.sg_list,
		     job->request_payload.sg_cnt, DMA_TO_DEVICE);
	pci_unmap_sg(phba->pcidev, job->reply_payload.sg_list,
		     job->reply_payload.sg_cnt, DMA_FROM_DEVICE);

	lpfc_mbuf_free(phba, bmp->virt, bmp->phys);

free_cmdiocbq:
	lpfc_sli_release_iocbq(phba, cmdiocbq);
free_bmp:
	kfree(bmp);
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 *pbuflist = NULL;
	struct fc_bsg_ctels_reply *els_reply;
	uint8_t *rjt_data;
	unsigned long flags;
	int rc = 0;

	spin_lock_irqsave(&phba->ct_ev_lock, flags);
	dd_data = cmdiocbq->context1;
	/* normal completion and timeout crossed paths, already done */
	if (!dd_data) {
		spin_unlock_irqrestore(&phba->ct_ev_lock, flags);
		return;
	}

	cmdiocbq->iocb_flag |= LPFC_IO_WAKE;
	if (cmdiocbq->context2 && rspiocbq)
		memcpy(&((struct lpfc_iocbq *)cmdiocbq->context2)->iocb,
		       &rspiocbq->iocb, sizeof(IOCB_t));

	job = dd_data->context_un.iocb.set_job;
	cmdiocbq = dd_data->context_un.iocb.cmdiocbq;
	rspiocbq = dd_data->context_un.iocb.rspiocbq;
	rsp = &rspiocbq->iocb;
	ndlp = dd_data->context_un.iocb.ndlp;

	pci_unmap_sg(phba->pcidev, job->request_payload.sg_list,
		     job->request_payload.sg_cnt, DMA_TO_DEVICE);
	pci_unmap_sg(phba->pcidev, job->reply_payload.sg_list,
		     job->reply_payload.sg_cnt, DMA_FROM_DEVICE);

	if (job->reply->result == -EAGAIN)
		rc = -EAGAIN;
	else if (rsp->ulpStatus == IOSTAT_SUCCESS)
		job->reply->reply_payload_rcv_len =
			rsp->un.elsreq64.bdl.bdeSize;
	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;

	pbuflist = (struct lpfc_dmabuf *) cmdiocbq->context3;
	lpfc_mbuf_free(phba, pbuflist->virt, pbuflist->phys);
	lpfc_sli_release_iocbq(phba, rspiocbq);
	lpfc_sli_release_iocbq(phba, cmdiocbq);
	lpfc_nlp_put(ndlp);
	kfree(dd_data);
	/* make error code available to userspace */
	job->reply->result = rc;
	job->dd_data = NULL;
	/* complete the job back to userspace */
	job->job_done(job);
	spin_unlock_irqrestore(&phba->ct_ev_lock, flags);
	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;
	uint32_t rspsize;
	struct lpfc_iocbq *rspiocbq;
	struct lpfc_iocbq *cmdiocbq;
	IOCB_t *rsp;
	uint16_t rpi = 0;
	struct lpfc_dmabuf *pcmd;
	struct lpfc_dmabuf *prsp;
	struct lpfc_dmabuf *pbuflist = NULL;
	struct ulp_bde64 *bpl;
	int request_nseg;
	int reply_nseg;
	struct scatterlist *sgel = NULL;
	int numbde;
	dma_addr_t busaddr;
	struct bsg_job_data *dd_data;
	uint32_t creg_val;
	int rc = 0;

	/* 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,
				"2735 Failed allocation of dd_data\n");
		rc = -ENOMEM;
		goto no_dd_data;
	}

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

	elscmd = job->request->rqst_data.r_els.els_code;
	cmdsize = job->request_payload.payload_len;
	rspsize = job->reply_payload.payload_len;
	rspiocbq = lpfc_sli_get_iocbq(phba);
	if (!rspiocbq) {
		lpfc_nlp_put(ndlp);
		rc = -ENOMEM;
		goto free_dd_data;
	}

	rsp = &rspiocbq->iocb;
	rpi = ndlp->nlp_rpi;

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

	/* prep els iocb set context1 to the ndlp, context2 to the command
	 * dmabuf, context3 holds the data dmabuf
	 */
	pcmd = (struct lpfc_dmabuf *) cmdiocbq->context2;
	prsp = (struct lpfc_dmabuf *) pcmd->list.next;
	lpfc_mbuf_free(phba, pcmd->virt, pcmd->phys);
	kfree(pcmd);
	lpfc_mbuf_free(phba, prsp->virt, prsp->phys);
	kfree(prsp);
	cmdiocbq->context2 = NULL;

	pbuflist = (struct lpfc_dmabuf *) cmdiocbq->context3;
	bpl = (struct ulp_bde64 *) pbuflist->virt;

	request_nseg = pci_map_sg(phba->pcidev, job->request_payload.sg_list,
				  job->request_payload.sg_cnt, DMA_TO_DEVICE);
	for_each_sg(job->request_payload.sg_list, sgel, request_nseg, numbde) {
		busaddr = sg_dma_address(sgel);
		bpl->tus.f.bdeFlags = BUFF_TYPE_BDE_64;
		bpl->tus.f.bdeSize = sg_dma_len(sgel);
		bpl->tus.w = cpu_to_le32(bpl->tus.w);
		bpl->addrLow = cpu_to_le32(putPaddrLow(busaddr));
		bpl->addrHigh = cpu_to_le32(putPaddrHigh(busaddr));
		bpl++;
	}

	reply_nseg = pci_map_sg(phba->pcidev, job->reply_payload.sg_list,
				job->reply_payload.sg_cnt, DMA_FROM_DEVICE);
	for_each_sg(job->reply_payload.sg_list, sgel, reply_nseg, numbde) {
		busaddr = sg_dma_address(sgel);
		bpl->tus.f.bdeFlags = BUFF_TYPE_BDE_64I;
		bpl->tus.f.bdeSize = sg_dma_len(sgel);
		bpl->tus.w = cpu_to_le32(bpl->tus.w);
		bpl->addrLow = cpu_to_le32(putPaddrLow(busaddr));
		bpl->addrHigh = cpu_to_le32(putPaddrHigh(busaddr));
		bpl++;
	}
	cmdiocbq->iocb.un.elsreq64.bdl.bdeSize =
		(request_nseg + reply_nseg) * sizeof(struct ulp_bde64);
	cmdiocbq->iocb.ulpContext = rpi;
	cmdiocbq->iocb_flag |= LPFC_IO_LIBDFC;
	cmdiocbq->context1 = NULL;
	cmdiocbq->context2 = NULL;

	cmdiocbq->iocb_cmpl = lpfc_bsg_rport_els_cmp;
	cmdiocbq->context1 = dd_data;
	cmdiocbq->context2 = rspiocbq;
	dd_data->type = TYPE_IOCB;
	dd_data->context_un.iocb.cmdiocbq = cmdiocbq;
	dd_data->context_un.iocb.rspiocbq = rspiocbq;
	dd_data->context_un.iocb.set_job = job;
	dd_data->context_un.iocb.bmp = NULL;
	dd_data->context_un.iocb.ndlp = ndlp;

	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);
	lpfc_nlp_put(ndlp);
	if (rc == IOCB_SUCCESS)
		return 0; /* done for now */
	else if (rc == IOCB_BUSY)
		rc = -EAGAIN;
	else
		rc = -EIO;

linkdown_err:
	pci_unmap_sg(phba->pcidev, job->request_payload.sg_list,
		     job->request_payload.sg_cnt, DMA_TO_DEVICE);
	pci_unmap_sg(phba->pcidev, job->reply_payload.sg_list,
		     job->reply_payload.sg_cnt, DMA_FROM_DEVICE);

	lpfc_mbuf_free(phba, pbuflist->virt, pbuflist->phys);

	lpfc_sli_release_iocbq(phba, cmdiocbq);

free_rspiocbq:
	lpfc_sli_release_iocbq(phba, rspiocbq);

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);
}

/**
 * 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;
	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;
	uint32_t len;
	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;
	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;
	len = ct_req->CommandResponse.bits.Size;
	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) % 64;
			/* Provide warning for over-run of the ct_ctx array */
			if (phba->ct_ctx[evt_dat->immed_dat].flags &
			    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].flags = 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);
		lpfc_bsg_event_unref(evt);

		job = evt->set_job;
		evt->set_job = NULL;
		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_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;
	}

	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;
	}

	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;
			break;
		}
	}
	spin_unlock_irqrestore(&phba->ct_ev_lock, flags);

	if (&evt->node == &phba->ct_ev_waiters) {
		/* no event waiting struct yet - first call */
		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;
		}

		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->type = TYPE_EVT;
	dd_data->context_un.evt = evt;
	evt->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;
	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(evt, &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;
	struct lpfc_nodelist *ndlp;
	unsigned long flags;
	int rc = 0;

	spin_lock_irqsave(&phba->ct_ev_lock, flags);
	dd_data = cmdiocbq->context2;
	/* normal completion and timeout crossed paths, already done */
	if (!dd_data) {
		spin_unlock_irqrestore(&phba->ct_ev_lock, flags);
		return;
	}

	job = dd_data->context_un.iocb.set_job;
	bmp = dd_data->context_un.iocb.bmp;
	rsp = &rspiocbq->iocb;
	ndlp = dd_data->context_un.iocb.ndlp;

	pci_unmap_sg(phba->pcidev, job->request_payload.sg_list,
		     job->request_payload.sg_cnt, DMA_TO_DEVICE);

	if (rsp->ulpStatus) {
		if (rsp->ulpStatus == IOSTAT_LOCAL_REJECT) {
			switch (rsp->un.ulpWord[4] & 0xff) {
			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 =
			rsp->un.genreq64.bdl.bdeSize;

	lpfc_mbuf_free(phba, bmp->virt, bmp->phys);
	lpfc_sli_release_iocbq(phba, cmdiocbq);
	lpfc_nlp_put(ndlp);
	kfree(bmp);
	kfree(dd_data);
	/* make error code available to userspace */
	job->reply->result = rc;
	job->dd_data = NULL;
	/* complete the job back to userspace */
	job->job_done(job);
	spin_unlock_irqrestore(&phba->ct_ev_lock, flags);
	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 *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;
	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].flags & 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].flags &= ~UNSOL_VALID;
	} 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->context3 = bmp;

	ctiocb->iocb_cmpl = lpfc_issue_ct_rsp_cmp;
	ctiocb->context2 = dd_data;
	ctiocb->context1 = ndlp;
	dd_data->type = TYPE_IOCB;
	dd_data->context_un.iocb.cmdiocbq = ctiocb;
	dd_data->context_un.iocb.rspiocbq = NULL;
	dd_data->context_un.iocb.set_job = job;
	dd_data->context_un.iocb.bmp = bmp;
	dd_data->context_un.iocb.ndlp = ndlp;

	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)
		return 0; /* done for now */

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;
	struct scatterlist *sgel = NULL;
	int request_nseg;
	int numbde;
	dma_addr_t busaddr;
	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;
	request_nseg = pci_map_sg(phba->pcidev, job->request_payload.sg_list,
				  job->request_payload.sg_cnt, DMA_TO_DEVICE);
	for_each_sg(job->request_payload.sg_list, sgel, request_nseg, numbde) {
		busaddr = sg_dma_address(sgel);
		bpl->tus.f.bdeFlags = BUFF_TYPE_BDE_64;
		bpl->tus.f.bdeSize = sg_dma_len(sgel);
		bpl->tus.w = cpu_to_le32(bpl->tus.w);
		bpl->addrLow = cpu_to_le32(putPaddrLow(busaddr));
		bpl->addrHigh = cpu_to_le32(putPaddrHigh(busaddr));
		bpl++;
	}

	rc = lpfc_issue_ct_rsp(phba, job, tag, bmp, request_nseg);

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

	/* TBD need to handle a timeout */
	pci_unmap_sg(phba->pcidev, job->request_payload.sg_list,
			  job->request_payload.sg_cnt, DMA_TO_DEVICE);
	rc = -EACCES;
	lpfc_mbuf_free(phba, bmp->virt, bmp->phys);

send_mgmt_rsp_free_bmp:
	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 (pring->txcmplq_cnt) {
		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_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_SERDES);

	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) {
			rc = -ETIMEDOUT;
			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;
	uint32_t timeout;
	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;
	timeout = link_diag_test_cmd->timeout * 100;

	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 = 0;
	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;

	iocb_stat = lpfc_sli_issue_iocb_wait(phba, LPFC_ELS_RING, cmdiocbq,
				rspiocbq,
				(phba->fc_ratov * 2)
				+ LPFC_DRVR_TIMEOUT);
	if (iocb_stat) {
		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),
		((phba->fc_ratov * 2) + LPFC_DRVR_TIMEOUT) * HZ);
	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.
 * retruns 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_alloc_coherent(&pcidev->dev, BSG_MBOX_SIZE,
					  &(dmabuf->phys), GFP_KERNEL);

	if (!dmabuf->virt) {
		kfree(dmabuf);
		return NULL;
	}
	memset((uint8_t *)dmabuf->virt, 0, BSG_MBOX_SIZE);

	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;
	}

	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 diag_mode_test *diag_mode;
	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;
	struct lpfc_dmabufext *txbuffer = NULL;
	struct list_head head;
	struct lpfc_dmabuf  *curr;
	uint16_t txxri = 0, rxxri;
	uint32_t num_bde;
	uint8_t *ptr = NULL, *rx_databuf = NULL;
	int rc = 0;
	int time_left;
	int iocb_stat;
	unsigned long flags;
	void *dataout = NULL;
	uint32_t total_mem;

	/* in case no data is returned 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_test)) {
		lpfc_printf_log(phba, KERN_WARNING, LOG_LIBDFC,
				"2739 Received DIAG TEST request below minimum "
				"size\n");
		rc = -EINVAL;
		goto loopback_test_exit;
	}

	if (job->request_payload.payload_len !=
		job->reply_payload.payload_len) {
		rc = -EINVAL;
		goto loopback_test_exit;
	}
	diag_mode = (struct diag_mode_test *)
		job->request->rqst_data.h_vendor.vendor_cmd;

	if ((phba->link_state == LPFC_HBA_ERROR) ||
	    (psli->sli_flag & LPFC_BLOCK_MGMT_IO) ||
	    (!(psli->sli_flag & LPFC_SLI_ACTIVE))) {
		rc = -EACCES;
		goto loopback_test_exit;
	}

	if (!lpfc_is_link_up(phba) || !(phba->link_flag & LS_LOOPBACK_MODE)) {
		rc = -EACCES;
		goto loopback_test_exit;
	}

	size = job->request_payload.payload_len;
	full_size = size + ELX_LOOPBACK_HEADER_SZ; /* plus the header */

	if ((size == 0) || (size > 80 * BUF_SZ_4K)) {
		rc = -ERANGE;
		goto loopback_test_exit;
	}

	if (full_size >= BUF_SZ_4K) {
		/*
		 * Allocate memory for ioctl data. If buffer is bigger than 64k,
		 * then we allocate 64k and re-use that buffer over and over to
		 * xfer the whole block. This is because Linux kernel has a
		 * problem allocating more than 120k of kernel space memory. Saw
		 * problem with GET_FCPTARGETMAPPING...
		 */
		if (size <= (64 * 1024))
			total_mem = full_size;
		else
			total_mem = 64 * 1024;
	} else
		/* Allocate memory for ioctl data */
		total_mem = BUF_SZ_4K;

	dataout = kmalloc(total_mem, GFP_KERNEL);
	if (dataout == NULL) {
		rc = -ENOMEM;
		goto loopback_test_exit;
	}

	ptr = dataout;
	ptr += ELX_LOOPBACK_HEADER_SZ;
	sg_copy_to_buffer(job->request_payload.sg_list,
				job->request_payload.sg_cnt,
				ptr, size);
	rc = lpfcdiag_loop_self_reg(phba, &rpi);
	if (rc)
		goto loopback_test_exit;

	if (phba->sli_rev < LPFC_SLI_REV4) {
		rc = lpfcdiag_loop_get_xri(phba, rpi, &txxri, &rxxri);
		if (rc) {
			lpfcdiag_loop_self_unreg(phba, rpi);
			goto loopback_test_exit;
		}

		rc = lpfcdiag_loop_post_rxbufs(phba, rxxri, full_size);
		if (rc) {
			lpfcdiag_loop_self_unreg(phba, rpi);
			goto loopback_test_exit;
		}
	}
	evt = lpfc_bsg_event_new(FC_REG_CT_EVENT, current->pid,
				SLI_CT_ELX_LOOPBACK);
	if (!evt) {
		lpfcdiag_loop_self_unreg(phba, rpi);
		rc = -ENOMEM;
		goto loopback_test_exit;
	}

	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);
	if (phba->sli_rev < LPFC_SLI_REV4)
		rspiocbq = lpfc_sli_get_iocbq(phba);
	txbmp = kmalloc(sizeof(struct lpfc_dmabuf), GFP_KERNEL);

	if (txbmp) {
		txbmp->virt = lpfc_mbuf_alloc(phba, 0, &txbmp->phys);
		if (txbmp->virt) {
			INIT_LIST_HEAD(&txbmp->list);
			txbpl = (struct ulp_bde64 *) txbmp->virt;
			txbuffer = diag_cmd_data_alloc(phba,
							txbpl, full_size, 0);
		}
	}

	if (!cmdiocbq || !txbmp || !txbpl || !txbuffer || !txbmp->virt) {
		rc = -ENOMEM;
		goto err_loopback_test_exit;
	}
	if ((phba->sli_rev < LPFC_SLI_REV4) && !rspiocbq) {
		rc = -ENOMEM;
		goto err_loopback_test_exit;
	}

	cmd = &cmdiocbq->iocb;
	if (phba->sli_rev < LPFC_SLI_REV4)
		rsp = &rspiocbq->iocb;

	INIT_LIST_HEAD(&head);
	list_add_tail(&head, &txbuffer->dma.list);
	list_for_each_entry(curr, &head, list) {
		segment_len = ((struct lpfc_dmabufext *)curr)->size;
		if (current_offset == 0) {
			ctreq = curr->virt;
			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_DATA;
			ctreq->CommandResponse.bits.Size   = size;
			segment_offset = ELX_LOOPBACK_HEADER_SZ;
		} else
			segment_offset = 0;

		BUG_ON(segment_offset >= segment_len);
		memcpy(curr->virt + segment_offset,
			ptr + current_offset,
			segment_len - segment_offset);

		current_offset += segment_len - segment_offset;
		BUG_ON(current_offset > size);
	}
	list_del(&head);

	/* Build the XMIT_SEQUENCE iocb */
	num_bde = (uint32_t)txbuffer->flag;

	cmd->un.xseq64.bdl.addrHigh = putPaddrHigh(txbmp->phys);
	cmd->un.xseq64.bdl.addrLow = putPaddrLow(txbmp->phys);
	cmd->un.xseq64.bdl.bdeFlags = BUFF_TYPE_BLP_64;
	cmd->un.xseq64.bdl.bdeSize = (num_bde * sizeof(struct ulp_bde64));

	cmd->un.xseq64.w5.hcsw.Fctl = (LS | 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_CX;
	cmd->ulpBdeCount = 1;
	cmd->ulpLe = 1;
	cmd->ulpClass = CLASS3;

	if (phba->sli_rev < LPFC_SLI_REV4) {
		cmd->ulpContext