fnic_scsi.c 66.7 KB
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/*
 * Copyright 2008 Cisco Systems, Inc.  All rights reserved.
 * Copyright 2007 Nuova Systems, Inc.  All rights reserved.
 *
 * This program is free software; you may redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
#include <linux/mempool.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/workqueue.h>
#include <linux/pci.h>
#include <linux/scatterlist.h>
#include <linux/skbuff.h>
#include <linux/spinlock.h>
#include <linux/if_ether.h>
#include <linux/if_vlan.h>
#include <linux/delay.h>
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#include <linux/gfp.h>
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#include <scsi/scsi.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_tcq.h>
#include <scsi/fc/fc_els.h>
#include <scsi/fc/fc_fcoe.h>
#include <scsi/libfc.h>
#include <scsi/fc_frame.h>
#include "fnic_io.h"
#include "fnic.h"

const char *fnic_state_str[] = {
	[FNIC_IN_FC_MODE] =           "FNIC_IN_FC_MODE",
	[FNIC_IN_FC_TRANS_ETH_MODE] = "FNIC_IN_FC_TRANS_ETH_MODE",
	[FNIC_IN_ETH_MODE] =          "FNIC_IN_ETH_MODE",
	[FNIC_IN_ETH_TRANS_FC_MODE] = "FNIC_IN_ETH_TRANS_FC_MODE",
};

static const char *fnic_ioreq_state_str[] = {
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	[FNIC_IOREQ_NOT_INITED] = "FNIC_IOREQ_NOT_INITED",
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	[FNIC_IOREQ_CMD_PENDING] = "FNIC_IOREQ_CMD_PENDING",
	[FNIC_IOREQ_ABTS_PENDING] = "FNIC_IOREQ_ABTS_PENDING",
	[FNIC_IOREQ_ABTS_COMPLETE] = "FNIC_IOREQ_ABTS_COMPLETE",
	[FNIC_IOREQ_CMD_COMPLETE] = "FNIC_IOREQ_CMD_COMPLETE",
};

static const char *fcpio_status_str[] =  {
	[FCPIO_SUCCESS] = "FCPIO_SUCCESS", /*0x0*/
	[FCPIO_INVALID_HEADER] = "FCPIO_INVALID_HEADER",
	[FCPIO_OUT_OF_RESOURCE] = "FCPIO_OUT_OF_RESOURCE",
	[FCPIO_INVALID_PARAM] = "FCPIO_INVALID_PARAM]",
	[FCPIO_REQ_NOT_SUPPORTED] = "FCPIO_REQ_NOT_SUPPORTED",
	[FCPIO_IO_NOT_FOUND] = "FCPIO_IO_NOT_FOUND",
	[FCPIO_ABORTED] = "FCPIO_ABORTED", /*0x41*/
	[FCPIO_TIMEOUT] = "FCPIO_TIMEOUT",
	[FCPIO_SGL_INVALID] = "FCPIO_SGL_INVALID",
	[FCPIO_MSS_INVALID] = "FCPIO_MSS_INVALID",
	[FCPIO_DATA_CNT_MISMATCH] = "FCPIO_DATA_CNT_MISMATCH",
	[FCPIO_FW_ERR] = "FCPIO_FW_ERR",
	[FCPIO_ITMF_REJECTED] = "FCPIO_ITMF_REJECTED",
	[FCPIO_ITMF_FAILED] = "FCPIO_ITMF_FAILED",
	[FCPIO_ITMF_INCORRECT_LUN] = "FCPIO_ITMF_INCORRECT_LUN",
	[FCPIO_CMND_REJECTED] = "FCPIO_CMND_REJECTED",
	[FCPIO_NO_PATH_AVAIL] = "FCPIO_NO_PATH_AVAIL",
	[FCPIO_PATH_FAILED] = "FCPIO_PATH_FAILED",
	[FCPIO_LUNMAP_CHNG_PEND] = "FCPIO_LUNHMAP_CHNG_PEND",
};

const char *fnic_state_to_str(unsigned int state)
{
	if (state >= ARRAY_SIZE(fnic_state_str) || !fnic_state_str[state])
		return "unknown";

	return fnic_state_str[state];
}

static const char *fnic_ioreq_state_to_str(unsigned int state)
{
	if (state >= ARRAY_SIZE(fnic_ioreq_state_str) ||
	    !fnic_ioreq_state_str[state])
		return "unknown";

	return fnic_ioreq_state_str[state];
}

static const char *fnic_fcpio_status_to_str(unsigned int status)
{
	if (status >= ARRAY_SIZE(fcpio_status_str) || !fcpio_status_str[status])
		return "unknown";

	return fcpio_status_str[status];
}

static void fnic_cleanup_io(struct fnic *fnic, int exclude_id);

static inline spinlock_t *fnic_io_lock_hash(struct fnic *fnic,
					    struct scsi_cmnd *sc)
{
	u32 hash = sc->request->tag & (FNIC_IO_LOCKS - 1);

	return &fnic->io_req_lock[hash];
}

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static inline spinlock_t *fnic_io_lock_tag(struct fnic *fnic,
					    int tag)
{
	return &fnic->io_req_lock[tag & (FNIC_IO_LOCKS - 1)];
}

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/*
 * Unmap the data buffer and sense buffer for an io_req,
 * also unmap and free the device-private scatter/gather list.
 */
static void fnic_release_ioreq_buf(struct fnic *fnic,
				   struct fnic_io_req *io_req,
				   struct scsi_cmnd *sc)
{
	if (io_req->sgl_list_pa)
		pci_unmap_single(fnic->pdev, io_req->sgl_list_pa,
				 sizeof(io_req->sgl_list[0]) * io_req->sgl_cnt,
				 PCI_DMA_TODEVICE);
	scsi_dma_unmap(sc);

	if (io_req->sgl_cnt)
		mempool_free(io_req->sgl_list_alloc,
			     fnic->io_sgl_pool[io_req->sgl_type]);
	if (io_req->sense_buf_pa)
		pci_unmap_single(fnic->pdev, io_req->sense_buf_pa,
				 SCSI_SENSE_BUFFERSIZE, PCI_DMA_FROMDEVICE);
}

/* Free up Copy Wq descriptors. Called with copy_wq lock held */
static int free_wq_copy_descs(struct fnic *fnic, struct vnic_wq_copy *wq)
{
	/* if no Ack received from firmware, then nothing to clean */
	if (!fnic->fw_ack_recd[0])
		return 1;

	/*
	 * Update desc_available count based on number of freed descriptors
	 * Account for wraparound
	 */
	if (wq->to_clean_index <= fnic->fw_ack_index[0])
		wq->ring.desc_avail += (fnic->fw_ack_index[0]
					- wq->to_clean_index + 1);
	else
		wq->ring.desc_avail += (wq->ring.desc_count
					- wq->to_clean_index
					+ fnic->fw_ack_index[0] + 1);

	/*
	 * just bump clean index to ack_index+1 accounting for wraparound
	 * this will essentially free up all descriptors between
	 * to_clean_index and fw_ack_index, both inclusive
	 */
	wq->to_clean_index =
		(fnic->fw_ack_index[0] + 1) % wq->ring.desc_count;

	/* we have processed the acks received so far */
	fnic->fw_ack_recd[0] = 0;
	return 0;
}


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/**
 * __fnic_set_state_flags
 * Sets/Clears bits in fnic's state_flags
 **/
void
__fnic_set_state_flags(struct fnic *fnic, unsigned long st_flags,
			unsigned long clearbits)
{
	struct Scsi_Host *host = fnic->lport->host;
	int sh_locked = spin_is_locked(host->host_lock);
	unsigned long flags = 0;

	if (!sh_locked)
		spin_lock_irqsave(host->host_lock, flags);

	if (clearbits)
		fnic->state_flags &= ~st_flags;
	else
		fnic->state_flags |= st_flags;

	if (!sh_locked)
		spin_unlock_irqrestore(host->host_lock, flags);

	return;
}


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/*
 * fnic_fw_reset_handler
 * Routine to send reset msg to fw
 */
int fnic_fw_reset_handler(struct fnic *fnic)
{
	struct vnic_wq_copy *wq = &fnic->wq_copy[0];
	int ret = 0;
	unsigned long flags;

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	/* indicate fwreset to io path */
	fnic_set_state_flags(fnic, FNIC_FLAGS_FWRESET);

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	skb_queue_purge(&fnic->frame_queue);
	skb_queue_purge(&fnic->tx_queue);

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	/* wait for io cmpl */
	while (atomic_read(&fnic->in_flight))
		schedule_timeout(msecs_to_jiffies(1));

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	spin_lock_irqsave(&fnic->wq_copy_lock[0], flags);

	if (vnic_wq_copy_desc_avail(wq) <= fnic->wq_copy_desc_low[0])
		free_wq_copy_descs(fnic, wq);

	if (!vnic_wq_copy_desc_avail(wq))
		ret = -EAGAIN;
	else
		fnic_queue_wq_copy_desc_fw_reset(wq, SCSI_NO_TAG);

	spin_unlock_irqrestore(&fnic->wq_copy_lock[0], flags);

	if (!ret)
		FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
			      "Issued fw reset\n");
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	else {
		fnic_clear_state_flags(fnic, FNIC_FLAGS_FWRESET);
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		FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
			      "Failed to issue fw reset\n");
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	}

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	return ret;
}


/*
 * fnic_flogi_reg_handler
 * Routine to send flogi register msg to fw
 */
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int fnic_flogi_reg_handler(struct fnic *fnic, u32 fc_id)
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{
	struct vnic_wq_copy *wq = &fnic->wq_copy[0];
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	enum fcpio_flogi_reg_format_type format;
	struct fc_lport *lp = fnic->lport;
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	u8 gw_mac[ETH_ALEN];
	int ret = 0;
	unsigned long flags;

	spin_lock_irqsave(&fnic->wq_copy_lock[0], flags);

	if (vnic_wq_copy_desc_avail(wq) <= fnic->wq_copy_desc_low[0])
		free_wq_copy_descs(fnic, wq);

	if (!vnic_wq_copy_desc_avail(wq)) {
		ret = -EAGAIN;
		goto flogi_reg_ioreq_end;
	}

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	if (fnic->ctlr.map_dest) {
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		memset(gw_mac, 0xff, ETH_ALEN);
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		format = FCPIO_FLOGI_REG_DEF_DEST;
	} else {
		memcpy(gw_mac, fnic->ctlr.dest_addr, ETH_ALEN);
		format = FCPIO_FLOGI_REG_GW_DEST;
	}
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	if ((fnic->config.flags & VFCF_FIP_CAPABLE) && !fnic->ctlr.map_dest) {
		fnic_queue_wq_copy_desc_fip_reg(wq, SCSI_NO_TAG,
						fc_id, gw_mac,
						fnic->data_src_addr,
						lp->r_a_tov, lp->e_d_tov);
		FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
			      "FLOGI FIP reg issued fcid %x src %pM dest %pM\n",
			      fc_id, fnic->data_src_addr, gw_mac);
	} else {
		fnic_queue_wq_copy_desc_flogi_reg(wq, SCSI_NO_TAG,
						  format, fc_id, gw_mac);
		FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
			      "FLOGI reg issued fcid %x map %d dest %pM\n",
			      fc_id, fnic->ctlr.map_dest, gw_mac);
	}
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flogi_reg_ioreq_end:
	spin_unlock_irqrestore(&fnic->wq_copy_lock[0], flags);
	return ret;
}

/*
 * fnic_queue_wq_copy_desc
 * Routine to enqueue a wq copy desc
 */
static inline int fnic_queue_wq_copy_desc(struct fnic *fnic,
					  struct vnic_wq_copy *wq,
					  struct fnic_io_req *io_req,
					  struct scsi_cmnd *sc,
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					  int sg_count)
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{
	struct scatterlist *sg;
	struct fc_rport *rport = starget_to_rport(scsi_target(sc->device));
	struct fc_rport_libfc_priv *rp = rport->dd_data;
	struct host_sg_desc *desc;
	u8 pri_tag = 0;
	unsigned int i;
	unsigned long intr_flags;
	int flags;
	u8 exch_flags;
	struct scsi_lun fc_lun;
	char msg[2];

	if (sg_count) {
		/* For each SGE, create a device desc entry */
		desc = io_req->sgl_list;
		for_each_sg(scsi_sglist(sc), sg, sg_count, i) {
			desc->addr = cpu_to_le64(sg_dma_address(sg));
			desc->len = cpu_to_le32(sg_dma_len(sg));
			desc->_resvd = 0;
			desc++;
		}

		io_req->sgl_list_pa = pci_map_single
			(fnic->pdev,
			 io_req->sgl_list,
			 sizeof(io_req->sgl_list[0]) * sg_count,
			 PCI_DMA_TODEVICE);
	}

	io_req->sense_buf_pa = pci_map_single(fnic->pdev,
					      sc->sense_buffer,
					      SCSI_SENSE_BUFFERSIZE,
					      PCI_DMA_FROMDEVICE);

	int_to_scsilun(sc->device->lun, &fc_lun);

	pri_tag = FCPIO_ICMND_PTA_SIMPLE;
	msg[0] = MSG_SIMPLE_TAG;
	scsi_populate_tag_msg(sc, msg);
	if (msg[0] == MSG_ORDERED_TAG)
		pri_tag = FCPIO_ICMND_PTA_ORDERED;

	/* Enqueue the descriptor in the Copy WQ */
	spin_lock_irqsave(&fnic->wq_copy_lock[0], intr_flags);

	if (vnic_wq_copy_desc_avail(wq) <= fnic->wq_copy_desc_low[0])
		free_wq_copy_descs(fnic, wq);

	if (unlikely(!vnic_wq_copy_desc_avail(wq))) {
		spin_unlock_irqrestore(&fnic->wq_copy_lock[0], intr_flags);
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		FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host,
			  "fnic_queue_wq_copy_desc failure - no descriptors\n");
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		return SCSI_MLQUEUE_HOST_BUSY;
	}

	flags = 0;
	if (sc->sc_data_direction == DMA_FROM_DEVICE)
		flags = FCPIO_ICMND_RDDATA;
	else if (sc->sc_data_direction == DMA_TO_DEVICE)
		flags = FCPIO_ICMND_WRDATA;

	exch_flags = 0;
	if ((fnic->config.flags & VFCF_FCP_SEQ_LVL_ERR) &&
	    (rp->flags & FC_RP_FLAGS_RETRY))
		exch_flags |= FCPIO_ICMND_SRFLAG_RETRY;

	fnic_queue_wq_copy_desc_icmnd_16(wq, sc->request->tag,
					 0, exch_flags, io_req->sgl_cnt,
					 SCSI_SENSE_BUFFERSIZE,
					 io_req->sgl_list_pa,
					 io_req->sense_buf_pa,
					 0, /* scsi cmd ref, always 0 */
					 pri_tag, /* scsi pri and tag */
					 flags,	/* command flags */
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					 sc->cmnd, sc->cmd_len,
					 scsi_bufflen(sc),
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					 fc_lun.scsi_lun, io_req->port_id,
					 rport->maxframe_size, rp->r_a_tov,
					 rp->e_d_tov);

	spin_unlock_irqrestore(&fnic->wq_copy_lock[0], intr_flags);
	return 0;
}

/*
 * fnic_queuecommand
 * Routine to send a scsi cdb
 * Called with host_lock held and interrupts disabled.
 */
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static int fnic_queuecommand_lck(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *))
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{
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	struct fc_lport *lp = shost_priv(sc->device->host);
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	struct fc_rport *rport;
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	struct fnic_io_req *io_req = NULL;
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	struct fnic *fnic = lport_priv(lp);
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	struct vnic_wq_copy *wq;
	int ret;
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	u64 cmd_trace;
	int sg_count = 0;
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	unsigned long flags;
	unsigned long ptr;

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	if (unlikely(fnic_chk_state_flags_locked(fnic, FNIC_FLAGS_IO_BLOCKED)))
		return SCSI_MLQUEUE_HOST_BUSY;

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	rport = starget_to_rport(scsi_target(sc->device));
	ret = fc_remote_port_chkready(rport);
	if (ret) {
		sc->result = ret;
		done(sc);
		return 0;
	}

	if (lp->state != LPORT_ST_READY || !(lp->link_up))
		return SCSI_MLQUEUE_HOST_BUSY;

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	atomic_inc(&fnic->in_flight);

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	/*
	 * Release host lock, use driver resource specific locks from here.
	 * Don't re-enable interrupts in case they were disabled prior to the
	 * caller disabling them.
	 */
	spin_unlock(lp->host->host_lock);
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	CMD_STATE(sc) = FNIC_IOREQ_NOT_INITED;
	CMD_FLAGS(sc) = FNIC_NO_FLAGS;
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	/* Get a new io_req for this SCSI IO */
	io_req = mempool_alloc(fnic->io_req_pool, GFP_ATOMIC);
	if (!io_req) {
		ret = SCSI_MLQUEUE_HOST_BUSY;
		goto out;
	}
	memset(io_req, 0, sizeof(*io_req));

	/* Map the data buffer */
	sg_count = scsi_dma_map(sc);
	if (sg_count < 0) {
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		FNIC_TRACE(fnic_queuecommand, sc->device->host->host_no,
			  sc->request->tag, sc, 0, sc->cmnd[0],
			  sg_count, CMD_STATE(sc));
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		mempool_free(io_req, fnic->io_req_pool);
		goto out;
	}

	/* Determine the type of scatter/gather list we need */
	io_req->sgl_cnt = sg_count;
	io_req->sgl_type = FNIC_SGL_CACHE_DFLT;
	if (sg_count > FNIC_DFLT_SG_DESC_CNT)
		io_req->sgl_type = FNIC_SGL_CACHE_MAX;

	if (sg_count) {
		io_req->sgl_list =
			mempool_alloc(fnic->io_sgl_pool[io_req->sgl_type],
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				      GFP_ATOMIC);
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		if (!io_req->sgl_list) {
			ret = SCSI_MLQUEUE_HOST_BUSY;
			scsi_dma_unmap(sc);
			mempool_free(io_req, fnic->io_req_pool);
			goto out;
		}

		/* Cache sgl list allocated address before alignment */
		io_req->sgl_list_alloc = io_req->sgl_list;
		ptr = (unsigned long) io_req->sgl_list;
		if (ptr % FNIC_SG_DESC_ALIGN) {
			io_req->sgl_list = (struct host_sg_desc *)
				(((unsigned long) ptr
				  + FNIC_SG_DESC_ALIGN - 1)
				 & ~(FNIC_SG_DESC_ALIGN - 1));
		}
	}

	/* initialize rest of io_req */
	io_req->port_id = rport->port_id;
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	io_req->start_time = jiffies;
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	CMD_STATE(sc) = FNIC_IOREQ_CMD_PENDING;
	CMD_SP(sc) = (char *)io_req;
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	CMD_FLAGS(sc) |= FNIC_IO_INITIALIZED;
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	sc->scsi_done = done;

	/* create copy wq desc and enqueue it */
	wq = &fnic->wq_copy[0];
	ret = fnic_queue_wq_copy_desc(fnic, wq, io_req, sc, sg_count);
	if (ret) {
		/*
		 * In case another thread cancelled the request,
		 * refetch the pointer under the lock.
		 */
		spinlock_t *io_lock = fnic_io_lock_hash(fnic, sc);
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		FNIC_TRACE(fnic_queuecommand, sc->device->host->host_no,
			  sc->request->tag, sc, 0, 0, 0,
			  (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc)));
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		spin_lock_irqsave(io_lock, flags);
		io_req = (struct fnic_io_req *)CMD_SP(sc);
		CMD_SP(sc) = NULL;
		CMD_STATE(sc) = FNIC_IOREQ_CMD_COMPLETE;
		spin_unlock_irqrestore(io_lock, flags);
		if (io_req) {
			fnic_release_ioreq_buf(fnic, io_req, sc);
			mempool_free(io_req, fnic->io_req_pool);
		}
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	} else {
		/* REVISIT: Use per IO lock in the final code */
		CMD_FLAGS(sc) |= FNIC_IO_ISSUED;
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	}
out:
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	cmd_trace = ((u64)sc->cmnd[0] << 56 | (u64)sc->cmnd[7] << 40 |
			(u64)sc->cmnd[8] << 32 | (u64)sc->cmnd[2] << 24 |
			(u64)sc->cmnd[3] << 16 | (u64)sc->cmnd[4] << 8 |
			sc->cmnd[5]);

	FNIC_TRACE(fnic_queuecommand, sc->device->host->host_no,
		  sc->request->tag, sc, io_req,
		  sg_count, cmd_trace,
		  (((u64)CMD_FLAGS(sc) >> 32) | CMD_STATE(sc)));
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	atomic_dec(&fnic->in_flight);
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	/* acquire host lock before returning to SCSI */
	spin_lock(lp->host->host_lock);
	return ret;
}

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DEF_SCSI_QCMD(fnic_queuecommand)

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/*
 * fnic_fcpio_fw_reset_cmpl_handler
 * Routine to handle fw reset completion
 */
static int fnic_fcpio_fw_reset_cmpl_handler(struct fnic *fnic,
					    struct fcpio_fw_req *desc)
{
	u8 type;
	u8 hdr_status;
	struct fcpio_tag tag;
	int ret = 0;
	unsigned long flags;

	fcpio_header_dec(&desc->hdr, &type, &hdr_status, &tag);

	/* Clean up all outstanding io requests */
	fnic_cleanup_io(fnic, SCSI_NO_TAG);

	spin_lock_irqsave(&fnic->fnic_lock, flags);

	/* fnic should be in FC_TRANS_ETH_MODE */
	if (fnic->state == FNIC_IN_FC_TRANS_ETH_MODE) {
		/* Check status of reset completion */
		if (!hdr_status) {
			FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
				      "reset cmpl success\n");
			/* Ready to send flogi out */
			fnic->state = FNIC_IN_ETH_MODE;
		} else {
			FNIC_SCSI_DBG(KERN_DEBUG,
				      fnic->lport->host,
				      "fnic fw_reset : failed %s\n",
				      fnic_fcpio_status_to_str(hdr_status));

			/*
			 * Unable to change to eth mode, cannot send out flogi
			 * Change state to fc mode, so that subsequent Flogi
			 * requests from libFC will cause more attempts to
			 * reset the firmware. Free the cached flogi
			 */
			fnic->state = FNIC_IN_FC_MODE;
			ret = -1;
		}
	} else {
		FNIC_SCSI_DBG(KERN_DEBUG,
			      fnic->lport->host,
			      "Unexpected state %s while processing"
			      " reset cmpl\n", fnic_state_to_str(fnic->state));
		ret = -1;
	}

	/* Thread removing device blocks till firmware reset is complete */
	if (fnic->remove_wait)
		complete(fnic->remove_wait);

	/*
	 * If fnic is being removed, or fw reset failed
	 * free the flogi frame. Else, send it out
	 */
	if (fnic->remove_wait || ret) {
		spin_unlock_irqrestore(&fnic->fnic_lock, flags);
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		skb_queue_purge(&fnic->tx_queue);
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		goto reset_cmpl_handler_end;
	}

	spin_unlock_irqrestore(&fnic->fnic_lock, flags);

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	fnic_flush_tx(fnic);
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	fnic_clear_state_flags(fnic, FNIC_FLAGS_FWRESET);

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	return ret;
}

/*
 * fnic_fcpio_flogi_reg_cmpl_handler
 * Routine to handle flogi register completion
 */
static int fnic_fcpio_flogi_reg_cmpl_handler(struct fnic *fnic,
					     struct fcpio_fw_req *desc)
{
	u8 type;
	u8 hdr_status;
	struct fcpio_tag tag;
	int ret = 0;
	unsigned long flags;

	fcpio_header_dec(&desc->hdr, &type, &hdr_status, &tag);

	/* Update fnic state based on status of flogi reg completion */
	spin_lock_irqsave(&fnic->fnic_lock, flags);

	if (fnic->state == FNIC_IN_ETH_TRANS_FC_MODE) {

		/* Check flogi registration completion status */
		if (!hdr_status) {
			FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
				      "flog reg succeeded\n");
			fnic->state = FNIC_IN_FC_MODE;
		} else {
			FNIC_SCSI_DBG(KERN_DEBUG,
				      fnic->lport->host,
				      "fnic flogi reg :failed %s\n",
				      fnic_fcpio_status_to_str(hdr_status));
			fnic->state = FNIC_IN_ETH_MODE;
			ret = -1;
		}
	} else {
		FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
			      "Unexpected fnic state %s while"
			      " processing flogi reg completion\n",
			      fnic_state_to_str(fnic->state));
		ret = -1;
	}

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	if (!ret) {
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		if (fnic->stop_rx_link_events) {
			spin_unlock_irqrestore(&fnic->fnic_lock, flags);
			goto reg_cmpl_handler_end;
		}
		spin_unlock_irqrestore(&fnic->fnic_lock, flags);

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		fnic_flush_tx(fnic);
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		queue_work(fnic_event_queue, &fnic->frame_work);
	} else {
		spin_unlock_irqrestore(&fnic->fnic_lock, flags);
	}

reg_cmpl_handler_end:
	return ret;
}

static inline int is_ack_index_in_range(struct vnic_wq_copy *wq,
					u16 request_out)
{
	if (wq->to_clean_index <= wq->to_use_index) {
		/* out of range, stale request_out index */
		if (request_out < wq->to_clean_index ||
		    request_out >= wq->to_use_index)
			return 0;
	} else {
		/* out of range, stale request_out index */
		if (request_out < wq->to_clean_index &&
		    request_out >= wq->to_use_index)
			return 0;
	}
	/* request_out index is in range */
	return 1;
}


/*
 * Mark that ack received and store the Ack index. If there are multiple
 * acks received before Tx thread cleans it up, the latest value will be
 * used which is correct behavior. This state should be in the copy Wq
 * instead of in the fnic
 */
static inline void fnic_fcpio_ack_handler(struct fnic *fnic,
					  unsigned int cq_index,
					  struct fcpio_fw_req *desc)
{
	struct vnic_wq_copy *wq;
	u16 request_out = desc->u.ack.request_out;
	unsigned long flags;
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	u64 *ox_id_tag = (u64 *)(void *)desc;
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	/* mark the ack state */
	wq = &fnic->wq_copy[cq_index - fnic->raw_wq_count - fnic->rq_count];
	spin_lock_irqsave(&fnic->wq_copy_lock[0], flags);

	if (is_ack_index_in_range(wq, request_out)) {
		fnic->fw_ack_index[0] = request_out;
		fnic->fw_ack_recd[0] = 1;
	}
	spin_unlock_irqrestore(&fnic->wq_copy_lock[0], flags);
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	FNIC_TRACE(fnic_fcpio_ack_handler,
		  fnic->lport->host->host_no, 0, 0, ox_id_tag[2], ox_id_tag[3],
		  ox_id_tag[4], ox_id_tag[5]);
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}

/*
 * fnic_fcpio_icmnd_cmpl_handler
 * Routine to handle icmnd completions
 */
static void fnic_fcpio_icmnd_cmpl_handler(struct fnic *fnic,
					 struct fcpio_fw_req *desc)
{
	u8 type;
	u8 hdr_status;
	struct fcpio_tag tag;
	u32 id;
	u64 xfer_len = 0;
	struct fcpio_icmnd_cmpl *icmnd_cmpl;
	struct fnic_io_req *io_req;
	struct scsi_cmnd *sc;
	unsigned long flags;
	spinlock_t *io_lock;
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	u64 cmd_trace;
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	unsigned long start_time;
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	/* Decode the cmpl description to get the io_req id */
	fcpio_header_dec(&desc->hdr, &type, &hdr_status, &tag);
	fcpio_tag_id_dec(&tag, &id);
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	icmnd_cmpl = &desc->u.icmnd_cmpl;
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	if (id >= FNIC_MAX_IO_REQ) {
		shost_printk(KERN_ERR, fnic->lport->host,
			"Tag out of range tag %x hdr status = %s\n",
			     id, fnic_fcpio_status_to_str(hdr_status));
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		return;
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	}
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	sc = scsi_host_find_tag(fnic->lport->host, id);
	WARN_ON_ONCE(!sc);
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	if (!sc) {
		shost_printk(KERN_ERR, fnic->lport->host,
			  "icmnd_cmpl sc is null - "
			  "hdr status = %s tag = 0x%x desc = 0x%p\n",
			  fnic_fcpio_status_to_str(hdr_status), id, desc);
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		FNIC_TRACE(fnic_fcpio_icmnd_cmpl_handler,
			  fnic->lport->host->host_no, id,
			  ((u64)icmnd_cmpl->_resvd0[1] << 16 |
			  (u64)icmnd_cmpl->_resvd0[0]),
			  ((u64)hdr_status << 16 |
			  (u64)icmnd_cmpl->scsi_status << 8 |
			  (u64)icmnd_cmpl->flags), desc,
			  (u64)icmnd_cmpl->residual, 0);
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		return;
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	}
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	io_lock = fnic_io_lock_hash(fnic, sc);
	spin_lock_irqsave(io_lock, flags);
	io_req = (struct fnic_io_req *)CMD_SP(sc);
	WARN_ON_ONCE(!io_req);
	if (!io_req) {
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		CMD_FLAGS(sc) |= FNIC_IO_REQ_NULL;
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		spin_unlock_irqrestore(io_lock, flags);
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		shost_printk(KERN_ERR, fnic->lport->host,
			  "icmnd_cmpl io_req is null - "
			  "hdr status = %s tag = 0x%x sc 0x%p\n",
			  fnic_fcpio_status_to_str(hdr_status), id, sc);
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		return;
	}
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	start_time = io_req->start_time;
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	/* firmware completed the io */
	io_req->io_completed = 1;

	/*
	 *  if SCSI-ML has already issued abort on this command,
	 * ignore completion of the IO. The abts path will clean it up
	 */
	if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING) {
		spin_unlock_irqrestore(io_lock, flags);
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		CMD_FLAGS(sc) |= FNIC_IO_ABTS_PENDING;
		switch (hdr_status) {
		case FCPIO_SUCCESS:
			CMD_FLAGS(sc) |= FNIC_IO_DONE;
			FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host,
				  "icmnd_cmpl ABTS pending hdr status = %s "
				  "sc  0x%p scsi_status %x  residual %d\n",
				  fnic_fcpio_status_to_str(hdr_status), sc,
				  icmnd_cmpl->scsi_status,
				  icmnd_cmpl->residual);
			break;
		case FCPIO_ABORTED:
			CMD_FLAGS(sc) |= FNIC_IO_ABORTED;
			break;
		default:
			FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host,
					  "icmnd_cmpl abts pending "
					  "hdr status = %s tag = 0x%x sc = 0x%p\n",
					  fnic_fcpio_status_to_str(hdr_status),
					  id, sc);
			break;
		}
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		return;
	}

	/* Mark the IO as complete */
	CMD_STATE(sc) = FNIC_IOREQ_CMD_COMPLETE;

	icmnd_cmpl = &desc->u.icmnd_cmpl;

	switch (hdr_status) {
	case FCPIO_SUCCESS:
		sc->result = (DID_OK << 16) | icmnd_cmpl->scsi_status;
		xfer_len = scsi_bufflen(sc);
		scsi_set_resid(sc, icmnd_cmpl->residual);

		if (icmnd_cmpl->flags & FCPIO_ICMND_CMPL_RESID_UNDER)
			xfer_len -= icmnd_cmpl->residual;

		break;

	case FCPIO_TIMEOUT:          /* request was timed out */
		sc->result = (DID_TIME_OUT << 16) | icmnd_cmpl->scsi_status;
		break;

	case FCPIO_ABORTED:          /* request was aborted */
		sc->result = (DID_ERROR << 16) | icmnd_cmpl->scsi_status;
		break;

	case FCPIO_DATA_CNT_MISMATCH: /* recv/sent more/less data than exp. */
		scsi_set_resid(sc, icmnd_cmpl->residual);
		sc->result = (DID_ERROR << 16) | icmnd_cmpl->scsi_status;
		break;

	case FCPIO_OUT_OF_RESOURCE:  /* out of resources to complete request */
		sc->result = (DID_REQUEUE << 16) | icmnd_cmpl->scsi_status;
		break;
	case FCPIO_INVALID_HEADER:   /* header contains invalid data */
	case FCPIO_INVALID_PARAM:    /* some parameter in request invalid */
	case FCPIO_REQ_NOT_SUPPORTED:/* request type is not supported */
	case FCPIO_IO_NOT_FOUND:     /* requested I/O was not found */
	case FCPIO_SGL_INVALID:      /* request was aborted due to sgl error */
	case FCPIO_MSS_INVALID:      /* request was aborted due to mss error */
	case FCPIO_FW_ERR:           /* request was terminated due fw error */
	default:
		shost_printk(KERN_ERR, fnic->lport->host, "hdr status = %s\n",
			     fnic_fcpio_status_to_str(hdr_status));
		sc->result = (DID_ERROR << 16) | icmnd_cmpl->scsi_status;
		break;
	}

	/* Break link with the SCSI command */
	CMD_SP(sc) = NULL;
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	CMD_FLAGS(sc) |= FNIC_IO_DONE;
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	spin_unlock_irqrestore(io_lock, flags);

	fnic_release_ioreq_buf(fnic, io_req, sc);

	mempool_free(io_req, fnic->io_req_pool);

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	cmd_trace = ((u64)hdr_status << 56) |
		  (u64)icmnd_cmpl->scsi_status << 48 |
		  (u64)icmnd_cmpl->flags << 40 | (u64)sc->cmnd[0] << 32 |
		  (u64)sc->cmnd[2] << 24 | (u64)sc->cmnd[3] << 16 |
		  (u64)sc->cmnd[4] << 8 | sc->cmnd[5];

	FNIC_TRACE(fnic_fcpio_icmnd_cmpl_handler,
		  sc->device->host->host_no, id, sc,
		  ((u64)icmnd_cmpl->_resvd0[1] << 56 |
		  (u64)icmnd_cmpl->_resvd0[0] << 48 |
		  jiffies_to_msecs(jiffies - start_time)),
		  desc, cmd_trace,
		  (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc)));

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	if (sc->sc_data_direction == DMA_FROM_DEVICE) {
		fnic->lport->host_stats.fcp_input_requests++;
		fnic->fcp_input_bytes += xfer_len;
	} else if (sc->sc_data_direction == DMA_TO_DEVICE) {
		fnic->lport->host_stats.fcp_output_requests++;
		fnic->fcp_output_bytes += xfer_len;
	} else
		fnic->lport->host_stats.fcp_control_requests++;

	/* Call SCSI completion function to complete the IO */
	if (sc->scsi_done)
		sc->scsi_done(sc);
}

/* fnic_fcpio_itmf_cmpl_handler
 * Routine to handle itmf completions
 */
static void fnic_fcpio_itmf_cmpl_handler(struct fnic *fnic,
					struct fcpio_fw_req *desc)
{
	u8 type;
	u8 hdr_status;
	struct fcpio_tag tag;
	u32 id;
	struct scsi_cmnd *sc;
	struct fnic_io_req *io_req;
	unsigned long flags;
	spinlock_t *io_lock;
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	unsigned long start_time;
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	fcpio_header_dec(&desc->hdr, &type, &hdr_status, &tag);
	fcpio_tag_id_dec(&tag, &id);

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	if ((id & FNIC_TAG_MASK) >= FNIC_MAX_IO_REQ) {
		shost_printk(KERN_ERR, fnic->lport->host,
		"Tag out of range tag %x hdr status = %s\n",
		id, fnic_fcpio_status_to_str(hdr_status));
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		return;
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	}
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	sc = scsi_host_find_tag(fnic->lport->host, id & FNIC_TAG_MASK);
	WARN_ON_ONCE(!sc);
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	if (!sc) {
		shost_printk(KERN_ERR, fnic->lport->host,
			  "itmf_cmpl sc is null - hdr status = %s tag = 0x%x\n",
			  fnic_fcpio_status_to_str(hdr_status), id);
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	}
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	io_lock = fnic_io_lock_hash(fnic, sc);
	spin_lock_irqsave(io_lock, flags);
	io_req = (struct fnic_io_req *)CMD_SP(sc);
	WARN_ON_ONCE(!io_req);
	if (!io_req) {
		spin_unlock_irqrestore(io_lock, flags);
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		CMD_FLAGS(sc) |= FNIC_IO_ABT_TERM_REQ_NULL;
		shost_printk(KERN_ERR, fnic->lport->host,
			  "itmf_cmpl io_req is null - "
			  "hdr status = %s tag = 0x%x sc 0x%p\n",
			  fnic_fcpio_status_to_str(hdr_status), id, sc);
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		return;
	}
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	start_time = io_req->start_time;
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	if ((id & FNIC_TAG_ABORT) && (id & FNIC_TAG_DEV_RST)) {
		/* Abort and terminate completion of device reset req */
		/* REVISIT : Add asserts about various flags */
		FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
			      "dev reset abts cmpl recd. id %x status %s\n",
			      id, fnic_fcpio_status_to_str(hdr_status));
		CMD_STATE(sc) = FNIC_IOREQ_ABTS_COMPLETE;
		CMD_ABTS_STATUS(sc) = hdr_status;
		CMD_FLAGS(sc) |= FNIC_DEV_RST_DONE;
		if (io_req->abts_done)
			complete(io_req->abts_done);
		spin_unlock_irqrestore(io_lock, flags);
	} else if (id & FNIC_TAG_ABORT) {
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		/* Completion of abort cmd */
		if (CMD_STATE(sc) != FNIC_IOREQ_ABTS_PENDING) {
			/* This is a late completion. Ignore it */
			spin_unlock_irqrestore(io_lock, flags);
			return;
		}
		CMD_ABTS_STATUS(sc) = hdr_status;
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		FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
			      "abts cmpl recd. id %d status %s\n",
			      (int)(id & FNIC_TAG_MASK),
			      fnic_fcpio_status_to_str(hdr_status));

		/*
		 * If scsi_eh thread is blocked waiting for abts to complete,
		 * signal completion to it. IO will be cleaned in the thread
		 * else clean it in this context
		 */
		if (io_req->abts_done) {
			complete(io_req->abts_done);
			spin_unlock_irqrestore(io_lock, flags);
		} else {
			FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
				      "abts cmpl, completing IO\n");
			CMD_SP(sc) = NULL;
			sc->result = (DID_ERROR << 16);

			spin_unlock_irqrestore(io_lock, flags);

			fnic_release_ioreq_buf(fnic, io_req, sc);
			mempool_free(io_req, fnic->io_req_pool);
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			if (sc->scsi_done) {
				FNIC_TRACE(fnic_fcpio_itmf_cmpl_handler,
					sc->device->host->host_no, id,
					sc,
					jiffies_to_msecs(jiffies - start_time),
					desc,
					(((u64)hdr_status << 40) |
					(u64)sc->cmnd[0] << 32 |
					(u64)sc->cmnd[2] << 24 |
					(u64)sc->cmnd[3] << 16 |
					(u64)sc->cmnd[4] << 8 | sc->cmnd[5]),
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