/* bnx2fc_io.c: QLogic Linux FCoE offload driver.
   * IO manager and SCSI IO processing.
   *
   * Copyright (c) 2008-2013 Broadcom Corporation
   * Copyright (c) 2014-2015 QLogic Corporation
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License as published by
   * the Free Software Foundation.
   *
   * Written by: Bhanu Prakash Gollapudi (bprakash@broadcom.com)
   */
  
  #include "bnx2fc.h"
  
  #define RESERVE_FREE_LIST_INDEX num_possible_cpus()
  
  static int bnx2fc_split_bd(struct bnx2fc_cmd *io_req, u64 addr, int sg_len,
  			   int bd_index);
  static int bnx2fc_map_sg(struct bnx2fc_cmd *io_req);
  static int bnx2fc_build_bd_list_from_sg(struct bnx2fc_cmd *io_req);
  static void bnx2fc_unmap_sg_list(struct bnx2fc_cmd *io_req);
  static void bnx2fc_free_mp_resc(struct bnx2fc_cmd *io_req);
  static void bnx2fc_parse_fcp_rsp(struct bnx2fc_cmd *io_req,
  				 struct fcoe_fcp_rsp_payload *fcp_rsp,
  				 u8 num_rq);
  
  void bnx2fc_cmd_timer_set(struct bnx2fc_cmd *io_req,
  			  unsigned int timer_msec)
  {
  	struct bnx2fc_interface *interface = io_req->port->priv;
  
  	if (queue_delayed_work(interface->timer_work_queue,
  			       &io_req->timeout_work,
  			       msecs_to_jiffies(timer_msec)))
  		kref_get(&io_req->refcount);
  }
  
  static void bnx2fc_cmd_timeout(struct work_struct *work)
  {
  	struct bnx2fc_cmd *io_req = container_of(work, struct bnx2fc_cmd,
  						 timeout_work.work);
  	u8 cmd_type = io_req->cmd_type;
  	struct bnx2fc_rport *tgt = io_req->tgt;
  	int rc;
  
  	BNX2FC_IO_DBG(io_req, "cmd_timeout, cmd_type = %d,"
  		      "req_flags = %lx
  ", cmd_type, io_req->req_flags);
  
  	spin_lock_bh(&tgt->tgt_lock);
  	if (test_and_clear_bit(BNX2FC_FLAG_ISSUE_RRQ, &io_req->req_flags)) {
  		clear_bit(BNX2FC_FLAG_RETIRE_OXID, &io_req->req_flags);
  		/*
  		 * ideally we should hold the io_req until RRQ complets,
  		 * and release io_req from timeout hold.
  		 */
  		spin_unlock_bh(&tgt->tgt_lock);
  		bnx2fc_send_rrq(io_req);
  		return;
  	}
  	if (test_and_clear_bit(BNX2FC_FLAG_RETIRE_OXID, &io_req->req_flags)) {
  		BNX2FC_IO_DBG(io_req, "IO ready for reuse now
  ");
  		goto done;
  	}
  
  	switch (cmd_type) {
  	case BNX2FC_SCSI_CMD:
  		if (test_and_clear_bit(BNX2FC_FLAG_EH_ABORT,
  							&io_req->req_flags)) {
  			/* Handle eh_abort timeout */
  			BNX2FC_IO_DBG(io_req, "eh_abort timed out
  ");
  			complete(&io_req->tm_done);
  		} else if (test_bit(BNX2FC_FLAG_ISSUE_ABTS,
  				    &io_req->req_flags)) {
  			/* Handle internally generated ABTS timeout */
  			BNX2FC_IO_DBG(io_req, "ABTS timed out refcnt = %d
  ",
  					io_req->refcount.refcount.counter);
  			if (!(test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
  					       &io_req->req_flags))) {
  				/*
  				 * Cleanup and return original command to
  				 * mid-layer.
  				 */
  				bnx2fc_initiate_cleanup(io_req);
  				kref_put(&io_req->refcount, bnx2fc_cmd_release);
  				spin_unlock_bh(&tgt->tgt_lock);
  
  				return;
  			}
  		} else {
  			/* Hanlde IO timeout */
  			BNX2FC_IO_DBG(io_req, "IO timed out. issue ABTS
  ");
  			if (test_and_set_bit(BNX2FC_FLAG_IO_COMPL,
  					     &io_req->req_flags)) {
  				BNX2FC_IO_DBG(io_req, "IO completed before "
  							   " timer expiry
  ");
  				goto done;
  			}
  
  			if (!test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS,
  					      &io_req->req_flags)) {
  				rc = bnx2fc_initiate_abts(io_req);
  				if (rc == SUCCESS)
  					goto done;
  
  				kref_put(&io_req->refcount, bnx2fc_cmd_release);
  				spin_unlock_bh(&tgt->tgt_lock);
  
  				return;
  			} else {
  				BNX2FC_IO_DBG(io_req, "IO already in "
  						      "ABTS processing
  ");
  			}
  		}
  		break;
  	case BNX2FC_ELS:
  
  		if (test_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags)) {
  			BNX2FC_IO_DBG(io_req, "ABTS for ELS timed out
  ");
  
  			if (!test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
  					      &io_req->req_flags)) {
  				kref_put(&io_req->refcount, bnx2fc_cmd_release);
  				spin_unlock_bh(&tgt->tgt_lock);
  
  				return;
  			}
  		} else {
  			/*
  			 * Handle ELS timeout.
  			 * tgt_lock is used to sync compl path and timeout
  			 * path. If els compl path is processing this IO, we
  			 * have nothing to do here, just release the timer hold
  			 */
  			BNX2FC_IO_DBG(io_req, "ELS timed out
  ");
  			if (test_and_set_bit(BNX2FC_FLAG_ELS_DONE,
  					       &io_req->req_flags))
  				goto done;
  
  			/* Indicate the cb_func that this ELS is timed out */
  			set_bit(BNX2FC_FLAG_ELS_TIMEOUT, &io_req->req_flags);
  
  			if ((io_req->cb_func) && (io_req->cb_arg)) {
  				io_req->cb_func(io_req->cb_arg);
  				io_req->cb_arg = NULL;
  			}
  		}
  		break;
  	default:
  		printk(KERN_ERR PFX "cmd_timeout: invalid cmd_type %d
  ",
  			cmd_type);
  		break;
  	}
  
  done:
  	/* release the cmd that was held when timer was set */
  	kref_put(&io_req->refcount, bnx2fc_cmd_release);
  	spin_unlock_bh(&tgt->tgt_lock);
  }
  
  static void bnx2fc_scsi_done(struct bnx2fc_cmd *io_req, int err_code)
  {
  	/* Called with host lock held */
  	struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
  
  	/*
  	 * active_cmd_queue may have other command types as well,
  	 * and during flush operation,  we want to error back only
  	 * scsi commands.
  	 */
  	if (io_req->cmd_type != BNX2FC_SCSI_CMD)
  		return;
  
  	BNX2FC_IO_DBG(io_req, "scsi_done. err_code = 0x%x
  ", err_code);
  	if (test_bit(BNX2FC_FLAG_CMD_LOST, &io_req->req_flags)) {
  		/* Do not call scsi done for this IO */
  		return;
  	}
  
  	bnx2fc_unmap_sg_list(io_req);
  	io_req->sc_cmd = NULL;
  	if (!sc_cmd) {
  		printk(KERN_ERR PFX "scsi_done - sc_cmd NULL. "
  				    "IO(0x%x) already cleaned up
  ",
  		       io_req->xid);
  		return;
  	}
  	sc_cmd->result = err_code << 16;
  
  	BNX2FC_IO_DBG(io_req, "sc=%p, result=0x%x, retries=%d, allowed=%d
  ",
  		sc_cmd, host_byte(sc_cmd->result), sc_cmd->retries,
  		sc_cmd->allowed);
  	scsi_set_resid(sc_cmd, scsi_bufflen(sc_cmd));
  	sc_cmd->SCp.ptr = NULL;
  	sc_cmd->scsi_done(sc_cmd);
  }
  
  struct bnx2fc_cmd_mgr *bnx2fc_cmd_mgr_alloc(struct bnx2fc_hba *hba)
  {
  	struct bnx2fc_cmd_mgr *cmgr;
  	struct io_bdt *bdt_info;
  	struct bnx2fc_cmd *io_req;
  	size_t len;
  	u32 mem_size;
  	u16 xid;
  	int i;
  	int num_ios, num_pri_ios;
  	size_t bd_tbl_sz;
  	int arr_sz = num_possible_cpus() + 1;
  	u16 min_xid = BNX2FC_MIN_XID;
  	u16 max_xid = hba->max_xid;
  
  	if (max_xid <= min_xid || max_xid == FC_XID_UNKNOWN) {
  		printk(KERN_ERR PFX "cmd_mgr_alloc: Invalid min_xid 0x%x \
  					and max_xid 0x%x
  ", min_xid, max_xid);
  		return NULL;
  	}
  	BNX2FC_MISC_DBG("min xid 0x%x, max xid 0x%x
  ", min_xid, max_xid);
  
  	num_ios = max_xid - min_xid + 1;
  	len = (num_ios * (sizeof(struct bnx2fc_cmd *)));
  	len += sizeof(struct bnx2fc_cmd_mgr);
  
  	cmgr = kzalloc(len, GFP_KERNEL);
  	if (!cmgr) {
  		printk(KERN_ERR PFX "failed to alloc cmgr
  ");
  		return NULL;
  	}
  
  	cmgr->free_list = kzalloc(sizeof(*cmgr->free_list) *
  				  arr_sz, GFP_KERNEL);
  	if (!cmgr->free_list) {
  		printk(KERN_ERR PFX "failed to alloc free_list
  ");
  		goto mem_err;
  	}
  
  	cmgr->free_list_lock = kzalloc(sizeof(*cmgr->free_list_lock) *
  				       arr_sz, GFP_KERNEL);
  	if (!cmgr->free_list_lock) {
  		printk(KERN_ERR PFX "failed to alloc free_list_lock
  ");
  		kfree(cmgr->free_list);
  		cmgr->free_list = NULL;
  		goto mem_err;
  	}
  
  	cmgr->hba = hba;
  	cmgr->cmds = (struct bnx2fc_cmd **)(cmgr + 1);
  
  	for (i = 0; i < arr_sz; i++)  {
  		INIT_LIST_HEAD(&cmgr->free_list[i]);
  		spin_lock_init(&cmgr->free_list_lock[i]);
  	}
  
  	/*
  	 * Pre-allocated pool of bnx2fc_cmds.
  	 * Last entry in the free list array is the free list
  	 * of slow path requests.
  	 */
  	xid = BNX2FC_MIN_XID;
  	num_pri_ios = num_ios - hba->elstm_xids;
  	for (i = 0; i < num_ios; i++) {
  		io_req = kzalloc(sizeof(*io_req), GFP_KERNEL);
  
  		if (!io_req) {
  			printk(KERN_ERR PFX "failed to alloc io_req
  ");
  			goto mem_err;
  		}
  
  		INIT_LIST_HEAD(&io_req->link);
  		INIT_DELAYED_WORK(&io_req->timeout_work, bnx2fc_cmd_timeout);
  
  		io_req->xid = xid++;
  		if (i < num_pri_ios)
  			list_add_tail(&io_req->link,
  				&cmgr->free_list[io_req->xid %
  						 num_possible_cpus()]);
  		else
  			list_add_tail(&io_req->link,
  				&cmgr->free_list[num_possible_cpus()]);
  		io_req++;
  	}
  
  	/* Allocate pool of io_bdts - one for each bnx2fc_cmd */
  	mem_size = num_ios * sizeof(struct io_bdt *);
  	cmgr->io_bdt_pool = kmalloc(mem_size, GFP_KERNEL);
  	if (!cmgr->io_bdt_pool) {
  		printk(KERN_ERR PFX "failed to alloc io_bdt_pool
  ");
  		goto mem_err;
  	}
  
  	mem_size = sizeof(struct io_bdt);
  	for (i = 0; i < num_ios; i++) {
  		cmgr->io_bdt_pool[i] = kmalloc(mem_size, GFP_KERNEL);
  		if (!cmgr->io_bdt_pool[i]) {
  			printk(KERN_ERR PFX "failed to alloc "
  				"io_bdt_pool[%d]
  ", i);
  			goto mem_err;
  		}
  	}
  
  	/* Allocate an map fcoe_bdt_ctx structures */
  	bd_tbl_sz = BNX2FC_MAX_BDS_PER_CMD * sizeof(struct fcoe_bd_ctx);
  	for (i = 0; i < num_ios; i++) {
  		bdt_info = cmgr->io_bdt_pool[i];
  		bdt_info->bd_tbl = dma_alloc_coherent(&hba->pcidev->dev,
  						      bd_tbl_sz,
  						      &bdt_info->bd_tbl_dma,
  						      GFP_KERNEL);
  		if (!bdt_info->bd_tbl) {
  			printk(KERN_ERR PFX "failed to alloc "
  				"bdt_tbl[%d]
  ", i);
  			goto mem_err;
  		}
  	}
  
  	return cmgr;
  
  mem_err:
  	bnx2fc_cmd_mgr_free(cmgr);
  	return NULL;
  }
  
  void bnx2fc_cmd_mgr_free(struct bnx2fc_cmd_mgr *cmgr)
  {
  	struct io_bdt *bdt_info;
  	struct bnx2fc_hba *hba = cmgr->hba;
  	size_t bd_tbl_sz;
  	u16 min_xid = BNX2FC_MIN_XID;
  	u16 max_xid = hba->max_xid;
  	int num_ios;
  	int i;
  
  	num_ios = max_xid - min_xid + 1;
  
  	/* Free fcoe_bdt_ctx structures */
  	if (!cmgr->io_bdt_pool)
  		goto free_cmd_pool;
  
  	bd_tbl_sz = BNX2FC_MAX_BDS_PER_CMD * sizeof(struct fcoe_bd_ctx);
  	for (i = 0; i < num_ios; i++) {
  		bdt_info = cmgr->io_bdt_pool[i];
  		if (bdt_info->bd_tbl) {
  			dma_free_coherent(&hba->pcidev->dev, bd_tbl_sz,
  					    bdt_info->bd_tbl,
  					    bdt_info->bd_tbl_dma);
  			bdt_info->bd_tbl = NULL;
  		}
  	}
  
  	/* Destroy io_bdt pool */
  	for (i = 0; i < num_ios; i++) {
  		kfree(cmgr->io_bdt_pool[i]);
  		cmgr->io_bdt_pool[i] = NULL;
  	}
  
  	kfree(cmgr->io_bdt_pool);
  	cmgr->io_bdt_pool = NULL;
  
  free_cmd_pool:
  	kfree(cmgr->free_list_lock);
  
  	/* Destroy cmd pool */
  	if (!cmgr->free_list)
  		goto free_cmgr;
  
  	for (i = 0; i < num_possible_cpus() + 1; i++)  {
  		struct bnx2fc_cmd *tmp, *io_req;
  
  		list_for_each_entry_safe(io_req, tmp,
  					 &cmgr->free_list[i], link) {
  			list_del(&io_req->link);
  			kfree(io_req);
  		}
  	}
  	kfree(cmgr->free_list);
  free_cmgr:
  	/* Free command manager itself */
  	kfree(cmgr);
  }
  
  struct bnx2fc_cmd *bnx2fc_elstm_alloc(struct bnx2fc_rport *tgt, int type)
  {
  	struct fcoe_port *port = tgt->port;
  	struct bnx2fc_interface *interface = port->priv;
  	struct bnx2fc_cmd_mgr *cmd_mgr = interface->hba->cmd_mgr;
  	struct bnx2fc_cmd *io_req;
  	struct list_head *listp;
  	struct io_bdt *bd_tbl;
  	int index = RESERVE_FREE_LIST_INDEX;
  	u32 free_sqes;
  	u32 max_sqes;
  	u16 xid;
  
  	max_sqes = tgt->max_sqes;
  	switch (type) {
  	case BNX2FC_TASK_MGMT_CMD:
  		max_sqes = BNX2FC_TM_MAX_SQES;
  		break;
  	case BNX2FC_ELS:
  		max_sqes = BNX2FC_ELS_MAX_SQES;
  		break;
  	default:
  		break;
  	}
  
  	/*
  	 * NOTE: Free list insertions and deletions are protected with
  	 * cmgr lock
  	 */
  	spin_lock_bh(&cmd_mgr->free_list_lock[index]);
  	free_sqes = atomic_read(&tgt->free_sqes);
  	if ((list_empty(&(cmd_mgr->free_list[index]))) ||
  	    (tgt->num_active_ios.counter  >= max_sqes) ||
  	    (free_sqes + max_sqes <= BNX2FC_SQ_WQES_MAX)) {
  		BNX2FC_TGT_DBG(tgt, "No free els_tm cmds available "
  			"ios(%d):sqes(%d)
  ",
  			tgt->num_active_ios.counter, tgt->max_sqes);
  		if (list_empty(&(cmd_mgr->free_list[index])))
  			printk(KERN_ERR PFX "elstm_alloc: list_empty
  ");
  		spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
  		return NULL;
  	}
  
  	listp = (struct list_head *)
  			cmd_mgr->free_list[index].next;
  	list_del_init(listp);
  	io_req = (struct bnx2fc_cmd *) listp;
  	xid = io_req->xid;
  	cmd_mgr->cmds[xid] = io_req;
  	atomic_inc(&tgt->num_active_ios);
  	atomic_dec(&tgt->free_sqes);
  	spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
  
  	INIT_LIST_HEAD(&io_req->link);
  
  	io_req->port = port;
  	io_req->cmd_mgr = cmd_mgr;
  	io_req->req_flags = 0;
  	io_req->cmd_type = type;
  
  	/* Bind io_bdt for this io_req */
  	/* Have a static link between io_req and io_bdt_pool */
  	bd_tbl = io_req->bd_tbl = cmd_mgr->io_bdt_pool[xid];
  	bd_tbl->io_req = io_req;
  
  	/* Hold the io_req  against deletion */
  	kref_init(&io_req->refcount);
  	return io_req;
  }
  
  struct bnx2fc_cmd *bnx2fc_cmd_alloc(struct bnx2fc_rport *tgt)
  {
  	struct fcoe_port *port = tgt->port;
  	struct bnx2fc_interface *interface = port->priv;
  	struct bnx2fc_cmd_mgr *cmd_mgr = interface->hba->cmd_mgr;
  	struct bnx2fc_cmd *io_req;
  	struct list_head *listp;
  	struct io_bdt *bd_tbl;
  	u32 free_sqes;
  	u32 max_sqes;
  	u16 xid;
  	int index = get_cpu();
  
  	max_sqes = BNX2FC_SCSI_MAX_SQES;
  	/*
  	 * NOTE: Free list insertions and deletions are protected with
  	 * cmgr lock
  	 */
  	spin_lock_bh(&cmd_mgr->free_list_lock[index]);
  	free_sqes = atomic_read(&tgt->free_sqes);
  	if ((list_empty(&cmd_mgr->free_list[index])) ||
  	    (tgt->num_active_ios.counter  >= max_sqes) ||
  	    (free_sqes + max_sqes <= BNX2FC_SQ_WQES_MAX)) {
  		spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
  		put_cpu();
  		return NULL;
  	}
  
  	listp = (struct list_head *)
  		cmd_mgr->free_list[index].next;
  	list_del_init(listp);
  	io_req = (struct bnx2fc_cmd *) listp;
  	xid = io_req->xid;
  	cmd_mgr->cmds[xid] = io_req;
  	atomic_inc(&tgt->num_active_ios);
  	atomic_dec(&tgt->free_sqes);
  	spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
  	put_cpu();
  
  	INIT_LIST_HEAD(&io_req->link);
  
  	io_req->port = port;
  	io_req->cmd_mgr = cmd_mgr;
  	io_req->req_flags = 0;
  
  	/* Bind io_bdt for this io_req */
  	/* Have a static link between io_req and io_bdt_pool */
  	bd_tbl = io_req->bd_tbl = cmd_mgr->io_bdt_pool[xid];
  	bd_tbl->io_req = io_req;
  
  	/* Hold the io_req  against deletion */
  	kref_init(&io_req->refcount);
  	return io_req;
  }
  
  void bnx2fc_cmd_release(struct kref *ref)
  {
  	struct bnx2fc_cmd *io_req = container_of(ref,
  						struct bnx2fc_cmd, refcount);
  	struct bnx2fc_cmd_mgr *cmd_mgr = io_req->cmd_mgr;
  	int index;
  
  	if (io_req->cmd_type == BNX2FC_SCSI_CMD)
  		index = io_req->xid % num_possible_cpus();
  	else
  		index = RESERVE_FREE_LIST_INDEX;
  
  
  	spin_lock_bh(&cmd_mgr->free_list_lock[index]);
  	if (io_req->cmd_type != BNX2FC_SCSI_CMD)
  		bnx2fc_free_mp_resc(io_req);
  	cmd_mgr->cmds[io_req->xid] = NULL;
  	/* Delete IO from retire queue */
  	list_del_init(&io_req->link);
  	/* Add it to the free list */
  	list_add(&io_req->link,
  			&cmd_mgr->free_list[index]);
  	atomic_dec(&io_req->tgt->num_active_ios);
  	spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
  
  }
  
  static void bnx2fc_free_mp_resc(struct bnx2fc_cmd *io_req)
  {
  	struct bnx2fc_mp_req *mp_req = &(io_req->mp_req);
  	struct bnx2fc_interface *interface = io_req->port->priv;
  	struct bnx2fc_hba *hba = interface->hba;
  	size_t sz = sizeof(struct fcoe_bd_ctx);
  
  	/* clear tm flags */
  	mp_req->tm_flags = 0;
  	if (mp_req->mp_req_bd) {
  		dma_free_coherent(&hba->pcidev->dev, sz,
  				     mp_req->mp_req_bd,
  				     mp_req->mp_req_bd_dma);
  		mp_req->mp_req_bd = NULL;
  	}
  	if (mp_req->mp_resp_bd) {
  		dma_free_coherent(&hba->pcidev->dev, sz,
  				     mp_req->mp_resp_bd,
  				     mp_req->mp_resp_bd_dma);
  		mp_req->mp_resp_bd = NULL;
  	}
  	if (mp_req->req_buf) {
  		dma_free_coherent(&hba->pcidev->dev, CNIC_PAGE_SIZE,
  				     mp_req->req_buf,
  				     mp_req->req_buf_dma);
  		mp_req->req_buf = NULL;
  	}
  	if (mp_req->resp_buf) {
  		dma_free_coherent(&hba->pcidev->dev, CNIC_PAGE_SIZE,
  				     mp_req->resp_buf,
  				     mp_req->resp_buf_dma);
  		mp_req->resp_buf = NULL;
  	}
  }
  
  int bnx2fc_init_mp_req(struct bnx2fc_cmd *io_req)
  {
  	struct bnx2fc_mp_req *mp_req;
  	struct fcoe_bd_ctx *mp_req_bd;
  	struct fcoe_bd_ctx *mp_resp_bd;
  	struct bnx2fc_interface *interface = io_req->port->priv;
  	struct bnx2fc_hba *hba = interface->hba;
  	dma_addr_t addr;
  	size_t sz;
  
  	mp_req = (struct bnx2fc_mp_req *)&(io_req->mp_req);
  	memset(mp_req, 0, sizeof(struct bnx2fc_mp_req));
  
  	if (io_req->cmd_type != BNX2FC_ELS) {
  		mp_req->req_len = sizeof(struct fcp_cmnd);
  		io_req->data_xfer_len = mp_req->req_len;
  	} else
  		mp_req->req_len = io_req->data_xfer_len;
  
  	mp_req->req_buf = dma_alloc_coherent(&hba->pcidev->dev, CNIC_PAGE_SIZE,
  					     &mp_req->req_buf_dma,
  					     GFP_ATOMIC);
  	if (!mp_req->req_buf) {
  		printk(KERN_ERR PFX "unable to alloc MP req buffer
  ");
  		bnx2fc_free_mp_resc(io_req);
  		return FAILED;
  	}
  
  	mp_req->resp_buf = dma_alloc_coherent(&hba->pcidev->dev, CNIC_PAGE_SIZE,
  					      &mp_req->resp_buf_dma,
  					      GFP_ATOMIC);
  	if (!mp_req->resp_buf) {
  		printk(KERN_ERR PFX "unable to alloc TM resp buffer
  ");
  		bnx2fc_free_mp_resc(io_req);
  		return FAILED;
  	}
  	memset(mp_req->req_buf, 0, CNIC_PAGE_SIZE);
  	memset(mp_req->resp_buf, 0, CNIC_PAGE_SIZE);
  
  	/* Allocate and map mp_req_bd and mp_resp_bd */
  	sz = sizeof(struct fcoe_bd_ctx);
  	mp_req->mp_req_bd = dma_alloc_coherent(&hba->pcidev->dev, sz,
  						 &mp_req->mp_req_bd_dma,
  						 GFP_ATOMIC);
  	if (!mp_req->mp_req_bd) {
  		printk(KERN_ERR PFX "unable to alloc MP req bd
  ");
  		bnx2fc_free_mp_resc(io_req);
  		return FAILED;
  	}
  	mp_req->mp_resp_bd = dma_alloc_coherent(&hba->pcidev->dev, sz,
  						 &mp_req->mp_resp_bd_dma,
  						 GFP_ATOMIC);
  	if (!mp_req->mp_resp_bd) {
  		printk(KERN_ERR PFX "unable to alloc MP resp bd
  ");
  		bnx2fc_free_mp_resc(io_req);
  		return FAILED;
  	}
  	/* Fill bd table */
  	addr = mp_req->req_buf_dma;
  	mp_req_bd = mp_req->mp_req_bd;
  	mp_req_bd->buf_addr_lo = (u32)addr & 0xffffffff;
  	mp_req_bd->buf_addr_hi = (u32)((u64)addr >> 32);
  	mp_req_bd->buf_len = CNIC_PAGE_SIZE;
  	mp_req_bd->flags = 0;
  
  	/*
  	 * MP buffer is either a task mgmt command or an ELS.
  	 * So the assumption is that it consumes a single bd
  	 * entry in the bd table
  	 */
  	mp_resp_bd = mp_req->mp_resp_bd;
  	addr = mp_req->resp_buf_dma;
  	mp_resp_bd->buf_addr_lo = (u32)addr & 0xffffffff;
  	mp_resp_bd->buf_addr_hi = (u32)((u64)addr >> 32);
  	mp_resp_bd->buf_len = CNIC_PAGE_SIZE;
  	mp_resp_bd->flags = 0;
  
  	return SUCCESS;
  }
  
  static int bnx2fc_initiate_tmf(struct scsi_cmnd *sc_cmd, u8 tm_flags)
  {
  	struct fc_lport *lport;
  	struct fc_rport *rport;
  	struct fc_rport_libfc_priv *rp;
  	struct fcoe_port *port;
  	struct bnx2fc_interface *interface;
  	struct bnx2fc_rport *tgt;
  	struct bnx2fc_cmd *io_req;
  	struct bnx2fc_mp_req *tm_req;
  	struct fcoe_task_ctx_entry *task;
  	struct fcoe_task_ctx_entry *task_page;
  	struct Scsi_Host *host = sc_cmd->device->host;
  	struct fc_frame_header *fc_hdr;
  	struct fcp_cmnd *fcp_cmnd;
  	int task_idx, index;
  	int rc = SUCCESS;
  	u16 xid;
  	u32 sid, did;
  	unsigned long start = jiffies;
  
  	lport = shost_priv(host);
  	rport = starget_to_rport(scsi_target(sc_cmd->device));
  	port = lport_priv(lport);
  	interface = port->priv;
  
  	if (rport == NULL) {
  		printk(KERN_ERR PFX "device_reset: rport is NULL
  ");
  		rc = FAILED;
  		goto tmf_err;
  	}
  	rp = rport->dd_data;
  
  	rc = fc_block_scsi_eh(sc_cmd);
  	if (rc)
  		return rc;
  
  	if (lport->state != LPORT_ST_READY || !(lport->link_up)) {
  		printk(KERN_ERR PFX "device_reset: link is not ready
  ");
  		rc = FAILED;
  		goto tmf_err;
  	}
  	/* rport and tgt are allocated together, so tgt should be non-NULL */
  	tgt = (struct bnx2fc_rport *)&rp[1];
  
  	if (!(test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags))) {
  		printk(KERN_ERR PFX "device_reset: tgt not offloaded
  ");
  		rc = FAILED;
  		goto tmf_err;
  	}
  retry_tmf:
  	io_req = bnx2fc_elstm_alloc(tgt, BNX2FC_TASK_MGMT_CMD);
  	if (!io_req) {
  		if (time_after(jiffies, start + HZ)) {
  			printk(KERN_ERR PFX "tmf: Failed TMF");
  			rc = FAILED;
  			goto tmf_err;
  		}
  		msleep(20);
  		goto retry_tmf;
  	}
  	/* Initialize rest of io_req fields */
  	io_req->sc_cmd = sc_cmd;
  	io_req->port = port;
  	io_req->tgt = tgt;
  
  	tm_req = (struct bnx2fc_mp_req *)&(io_req->mp_req);
  
  	rc = bnx2fc_init_mp_req(io_req);
  	if (rc == FAILED) {
  		printk(KERN_ERR PFX "Task mgmt MP request init failed
  ");
  		spin_lock_bh(&tgt->tgt_lock);
  		kref_put(&io_req->refcount, bnx2fc_cmd_release);
  		spin_unlock_bh(&tgt->tgt_lock);
  		goto tmf_err;
  	}
  
  	/* Set TM flags */
  	io_req->io_req_flags = 0;
  	tm_req->tm_flags = tm_flags;
  
  	/* Fill FCP_CMND */
  	bnx2fc_build_fcp_cmnd(io_req, (struct fcp_cmnd *)tm_req->req_buf);
  	fcp_cmnd = (struct fcp_cmnd *)tm_req->req_buf;
  	memset(fcp_cmnd->fc_cdb, 0,  sc_cmd->cmd_len);
  	fcp_cmnd->fc_dl = 0;
  
  	/* Fill FC header */
  	fc_hdr = &(tm_req->req_fc_hdr);
  	sid = tgt->sid;
  	did = rport->port_id;
  	__fc_fill_fc_hdr(fc_hdr, FC_RCTL_DD_UNSOL_CMD, did, sid,
  			   FC_TYPE_FCP, FC_FC_FIRST_SEQ | FC_FC_END_SEQ |
  			   FC_FC_SEQ_INIT, 0);
  	/* Obtain exchange id */
  	xid = io_req->xid;
  
  	BNX2FC_TGT_DBG(tgt, "Initiate TMF - xid = 0x%x
  ", xid);
  	task_idx = xid/BNX2FC_TASKS_PER_PAGE;
  	index = xid % BNX2FC_TASKS_PER_PAGE;
  
  	/* Initialize task context for this IO request */
  	task_page = (struct fcoe_task_ctx_entry *)
  			interface->hba->task_ctx[task_idx];
  	task = &(task_page[index]);
  	bnx2fc_init_mp_task(io_req, task);
  
  	sc_cmd->SCp.ptr = (char *)io_req;
  
  	/* Obtain free SQ entry */
  	spin_lock_bh(&tgt->tgt_lock);
  	bnx2fc_add_2_sq(tgt, xid);
  
  	/* Enqueue the io_req to active_tm_queue */
  	io_req->on_tmf_queue = 1;
  	list_add_tail(&io_req->link, &tgt->active_tm_queue);
  
  	init_completion(&io_req->tm_done);
  	io_req->wait_for_comp = 1;
  
  	/* Ring doorbell */
  	bnx2fc_ring_doorbell(tgt);
  	spin_unlock_bh(&tgt->tgt_lock);
  
  	rc = wait_for_completion_timeout(&io_req->tm_done,
  					 BNX2FC_TM_TIMEOUT * HZ);
  	spin_lock_bh(&tgt->tgt_lock);
  
  	io_req->wait_for_comp = 0;
  	if (!(test_bit(BNX2FC_FLAG_TM_COMPL, &io_req->req_flags))) {
  		set_bit(BNX2FC_FLAG_TM_TIMEOUT, &io_req->req_flags);
  		if (io_req->on_tmf_queue) {
  			list_del_init(&io_req->link);
  			io_req->on_tmf_queue = 0;
  		}
  		io_req->wait_for_comp = 1;
  		bnx2fc_initiate_cleanup(io_req);
  		spin_unlock_bh(&tgt->tgt_lock);
  		rc = wait_for_completion_timeout(&io_req->tm_done,
  						 BNX2FC_FW_TIMEOUT);
  		spin_lock_bh(&tgt->tgt_lock);
  		io_req->wait_for_comp = 0;
  		if (!rc)
  			kref_put(&io_req->refcount, bnx2fc_cmd_release);
  	}
  
  	spin_unlock_bh(&tgt->tgt_lock);
  
  	if (!rc) {
  		BNX2FC_TGT_DBG(tgt, "task mgmt command failed...
  ");
  		rc = FAILED;
  	} else {
  		BNX2FC_TGT_DBG(tgt, "task mgmt command success...
  ");
  		rc = SUCCESS;
  	}
  tmf_err:
  	return rc;
  }
  
  int bnx2fc_initiate_abts(struct bnx2fc_cmd *io_req)
  {
  	struct fc_lport *lport;
  	struct bnx2fc_rport *tgt = io_req->tgt;
  	struct fc_rport *rport = tgt->rport;
  	struct fc_rport_priv *rdata = tgt->rdata;
  	struct bnx2fc_interface *interface;
  	struct fcoe_port *port;
  	struct bnx2fc_cmd *abts_io_req;
  	struct fcoe_task_ctx_entry *task;
  	struct fcoe_task_ctx_entry *task_page;
  	struct fc_frame_header *fc_hdr;
  	struct bnx2fc_mp_req *abts_req;
  	int task_idx, index;
  	u32 sid, did;
  	u16 xid;
  	int rc = SUCCESS;
  	u32 r_a_tov = rdata->r_a_tov;
  
  	/* called with tgt_lock held */
  	BNX2FC_IO_DBG(io_req, "Entered bnx2fc_initiate_abts
  ");
  
  	port = io_req->port;
  	interface = port->priv;
  	lport = port->lport;
  
  	if (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags)) {
  		printk(KERN_ERR PFX "initiate_abts: tgt not offloaded
  ");
  		rc = FAILED;
  		goto abts_err;
  	}
  
  	if (rport == NULL) {
  		printk(KERN_ERR PFX "initiate_abts: rport is NULL
  ");
  		rc = FAILED;
  		goto abts_err;
  	}
  
  	if (lport->state != LPORT_ST_READY || !(lport->link_up)) {
  		printk(KERN_ERR PFX "initiate_abts: link is not ready
  ");
  		rc = FAILED;
  		goto abts_err;
  	}
  
  	abts_io_req = bnx2fc_elstm_alloc(tgt, BNX2FC_ABTS);
  	if (!abts_io_req) {
  		printk(KERN_ERR PFX "abts: couldnt allocate cmd
  ");
  		rc = FAILED;
  		goto abts_err;
  	}
  
  	/* Initialize rest of io_req fields */
  	abts_io_req->sc_cmd = NULL;
  	abts_io_req->port = port;
  	abts_io_req->tgt = tgt;
  	abts_io_req->data_xfer_len = 0; /* No data transfer for ABTS */
  
  	abts_req = (struct bnx2fc_mp_req *)&(abts_io_req->mp_req);
  	memset(abts_req, 0, sizeof(struct bnx2fc_mp_req));
  
  	/* Fill FC header */
  	fc_hdr = &(abts_req->req_fc_hdr);
  
  	/* Obtain oxid and rxid for the original exchange to be aborted */
  	fc_hdr->fh_ox_id = htons(io_req->xid);
  	fc_hdr->fh_rx_id = htons(io_req->task->rxwr_txrd.var_ctx.rx_id);
  
  	sid = tgt->sid;
  	did = rport->port_id;
  
  	__fc_fill_fc_hdr(fc_hdr, FC_RCTL_BA_ABTS, did, sid,
  			   FC_TYPE_BLS, FC_FC_FIRST_SEQ | FC_FC_END_SEQ |
  			   FC_FC_SEQ_INIT, 0);
  
  	xid = abts_io_req->xid;
  	BNX2FC_IO_DBG(abts_io_req, "ABTS io_req
  ");
  	task_idx = xid/BNX2FC_TASKS_PER_PAGE;
  	index = xid % BNX2FC_TASKS_PER_PAGE;
  
  	/* Initialize task context for this IO request */
  	task_page = (struct fcoe_task_ctx_entry *)
  			interface->hba->task_ctx[task_idx];
  	task = &(task_page[index]);
  	bnx2fc_init_mp_task(abts_io_req, task);
  
  	/*
  	 * ABTS task is a temporary task that will be cleaned up
  	 * irrespective of ABTS response. We need to start the timer
  	 * for the original exchange, as the CQE is posted for the original
  	 * IO request.
  	 *
  	 * Timer for ABTS is started only when it is originated by a
  	 * TM request. For the ABTS issued as part of ULP timeout,
  	 * scsi-ml maintains the timers.
  	 */
  
  	/* if (test_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags))*/
  	bnx2fc_cmd_timer_set(io_req, 2 * r_a_tov);
  
  	/* Obtain free SQ entry */
  	bnx2fc_add_2_sq(tgt, xid);
  
  	/* Ring doorbell */
  	bnx2fc_ring_doorbell(tgt);
  
  abts_err:
  	return rc;
  }
  
  int bnx2fc_initiate_seq_cleanup(struct bnx2fc_cmd *orig_io_req, u32 offset,
  				enum fc_rctl r_ctl)
  {
  	struct fc_lport *lport;
  	struct bnx2fc_rport *tgt = orig_io_req->tgt;
  	struct bnx2fc_interface *interface;
  	struct fcoe_port *port;
  	struct bnx2fc_cmd *seq_clnp_req;
  	struct fcoe_task_ctx_entry *task;
  	struct fcoe_task_ctx_entry *task_page;
  	struct bnx2fc_els_cb_arg *cb_arg = NULL;
  	int task_idx, index;
  	u16 xid;
  	int rc = 0;
  
  	BNX2FC_IO_DBG(orig_io_req, "bnx2fc_initiate_seq_cleanup xid = 0x%x
  ",
  		   orig_io_req->xid);
  	kref_get(&orig_io_req->refcount);
  
  	port = orig_io_req->port;
  	interface = port->priv;
  	lport = port->lport;
  
  	cb_arg = kzalloc(sizeof(struct bnx2fc_els_cb_arg), GFP_ATOMIC);
  	if (!cb_arg) {
  		printk(KERN_ERR PFX "Unable to alloc cb_arg for seq clnup
  ");
  		rc = -ENOMEM;
  		goto cleanup_err;
  	}
  
  	seq_clnp_req = bnx2fc_elstm_alloc(tgt, BNX2FC_SEQ_CLEANUP);
  	if (!seq_clnp_req) {
  		printk(KERN_ERR PFX "cleanup: couldnt allocate cmd
  ");
  		rc = -ENOMEM;
  		kfree(cb_arg);
  		goto cleanup_err;
  	}
  	/* Initialize rest of io_req fields */
  	seq_clnp_req->sc_cmd = NULL;
  	seq_clnp_req->port = port;
  	seq_clnp_req->tgt = tgt;
  	seq_clnp_req->data_xfer_len = 0; /* No data transfer for cleanup */
  
  	xid = seq_clnp_req->xid;
  
  	task_idx = xid/BNX2FC_TASKS_PER_PAGE;
  	index = xid % BNX2FC_TASKS_PER_PAGE;
  
  	/* Initialize task context for this IO request */
  	task_page = (struct fcoe_task_ctx_entry *)
  		     interface->hba->task_ctx[task_idx];
  	task = &(task_page[index]);
  	cb_arg->aborted_io_req = orig_io_req;
  	cb_arg->io_req = seq_clnp_req;
  	cb_arg->r_ctl = r_ctl;
  	cb_arg->offset = offset;
  	seq_clnp_req->cb_arg = cb_arg;
  
  	printk(KERN_ERR PFX "call init_seq_cleanup_task
  ");
  	bnx2fc_init_seq_cleanup_task(seq_clnp_req, task, orig_io_req, offset);
  
  	/* Obtain free SQ entry */
  	bnx2fc_add_2_sq(tgt, xid);
  
  	/* Ring doorbell */
  	bnx2fc_ring_doorbell(tgt);
  cleanup_err:
  	return rc;
  }
  
  int bnx2fc_initiate_cleanup(struct bnx2fc_cmd *io_req)
  {
  	struct fc_lport *lport;
  	struct bnx2fc_rport *tgt = io_req->tgt;
  	struct bnx2fc_interface *interface;
  	struct fcoe_port *port;
  	struct bnx2fc_cmd *cleanup_io_req;
  	struct fcoe_task_ctx_entry *task;
  	struct fcoe_task_ctx_entry *task_page;
  	int task_idx, index;
  	u16 xid, orig_xid;
  	int rc = 0;
  
  	/* ASSUMPTION: called with tgt_lock held */
  	BNX2FC_IO_DBG(io_req, "Entered bnx2fc_initiate_cleanup
  ");
  
  	port = io_req->port;
  	interface = port->priv;
  	lport = port->lport;
  
  	cleanup_io_req = bnx2fc_elstm_alloc(tgt, BNX2FC_CLEANUP);
  	if (!cleanup_io_req) {
  		printk(KERN_ERR PFX "cleanup: couldnt allocate cmd
  ");
  		rc = -1;
  		goto cleanup_err;
  	}
  
  	/* Initialize rest of io_req fields */
  	cleanup_io_req->sc_cmd = NULL;
  	cleanup_io_req->port = port;
  	cleanup_io_req->tgt = tgt;
  	cleanup_io_req->data_xfer_len = 0; /* No data transfer for cleanup */
  
  	xid = cleanup_io_req->xid;
  
  	task_idx = xid/BNX2FC_TASKS_PER_PAGE;
  	index = xid % BNX2FC_TASKS_PER_PAGE;
  
  	/* Initialize task context for this IO request */
  	task_page = (struct fcoe_task_ctx_entry *)
  			interface->hba->task_ctx[task_idx];
  	task = &(task_page[index]);
  	orig_xid = io_req->xid;
  
  	BNX2FC_IO_DBG(io_req, "CLEANUP io_req xid = 0x%x
  ", xid);
  
  	bnx2fc_init_cleanup_task(cleanup_io_req, task, orig_xid);
  
  	/* Obtain free SQ entry */
  	bnx2fc_add_2_sq(tgt, xid);
  
  	/* Ring doorbell */
  	bnx2fc_ring_doorbell(tgt);
  
  cleanup_err:
  	return rc;
  }
  
  /**
   * bnx2fc_eh_target_reset: Reset a target
   *
   * @sc_cmd:	SCSI command
   *
   * Set from SCSI host template to send task mgmt command to the target
   *	and wait for the response
   */
  int bnx2fc_eh_target_reset(struct scsi_cmnd *sc_cmd)
  {
  	return bnx2fc_initiate_tmf(sc_cmd, FCP_TMF_TGT_RESET);
  }
  
  /**
   * bnx2fc_eh_device_reset - Reset a single LUN
   *
   * @sc_cmd:	SCSI command
   *
   * Set from SCSI host template to send task mgmt command to the target
   *	and wait for the response
   */
  int bnx2fc_eh_device_reset(struct scsi_cmnd *sc_cmd)
  {
  	return bnx2fc_initiate_tmf(sc_cmd, FCP_TMF_LUN_RESET);
  }
  
  int bnx2fc_abts_cleanup(struct bnx2fc_cmd *io_req)
  {
  	struct bnx2fc_rport *tgt = io_req->tgt;
  	int rc = SUCCESS;
  
  	io_req->wait_for_comp = 1;
  	bnx2fc_initiate_cleanup(io_req);
  
  	spin_unlock_bh(&tgt->tgt_lock);
  
  	wait_for_completion(&io_req->tm_done);
  
  	io_req->wait_for_comp = 0;
  	/*
  	 * release the reference taken in eh_abort to allow the
  	 * target to re-login after flushing IOs
  	 */
  	kref_put(&io_req->refcount, bnx2fc_cmd_release);
  
  	spin_lock_bh(&tgt->tgt_lock);
  	return rc;
  }
  /**
   * bnx2fc_eh_abort - eh_abort_handler api to abort an outstanding
   *			SCSI command
   *
   * @sc_cmd:	SCSI_ML command pointer
   *
   * SCSI abort request handler
   */
  int bnx2fc_eh_abort(struct scsi_cmnd *sc_cmd)
  {
  	struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
  	struct fc_rport_libfc_priv *rp = rport->dd_data;
  	struct bnx2fc_cmd *io_req;
  	struct fc_lport *lport;
  	struct bnx2fc_rport *tgt;
  	int rc = FAILED;
  
  
  	rc = fc_block_scsi_eh(sc_cmd);
  	if (rc)
  		return rc;
  
  	lport = shost_priv(sc_cmd->device->host);
  	if ((lport->state != LPORT_ST_READY) || !(lport->link_up)) {
  		printk(KERN_ERR PFX "eh_abort: link not ready
  ");
  		return rc;
  	}
  
  	tgt = (struct bnx2fc_rport *)&rp[1];
  
  	BNX2FC_TGT_DBG(tgt, "Entered bnx2fc_eh_abort
  ");
  
  	spin_lock_bh(&tgt->tgt_lock);
  	io_req = (struct bnx2fc_cmd *)sc_cmd->SCp.ptr;
  	if (!io_req) {
  		/* Command might have just completed */
  		printk(KERN_ERR PFX "eh_abort: io_req is NULL
  ");
  		spin_unlock_bh(&tgt->tgt_lock);
  		return SUCCESS;
  	}
  	BNX2FC_IO_DBG(io_req, "eh_abort - refcnt = %d
  ",
  		      io_req->refcount.refcount.counter);
  
  	/* Hold IO request across abort processing */
  	kref_get(&io_req->refcount);
  
  	BUG_ON(tgt != io_req->tgt);
  
  	/* Remove the io_req from the active_q. */
  	/*
  	 * Task Mgmt functions (LUN RESET & TGT RESET) will not
  	 * issue an ABTS on this particular IO req, as the
  	 * io_req is no longer in the active_q.
  	 */
  	if (tgt->flush_in_prog) {
  		printk(KERN_ERR PFX "eh_abort: io_req (xid = 0x%x) "
  			"flush in progress
  ", io_req->xid);
  		kref_put(&io_req->refcount, bnx2fc_cmd_release);
  		spin_unlock_bh(&tgt->tgt_lock);
  		return SUCCESS;
  	}
  
  	if (io_req->on_active_queue == 0) {
  		printk(KERN_ERR PFX "eh_abort: io_req (xid = 0x%x) "
  				"not on active_q
  ", io_req->xid);
  		/*
  		 * This condition can happen only due to the FW bug,
  		 * where we do not receive cleanup response from
  		 * the FW. Handle this case gracefully by erroring
  		 * back the IO request to SCSI-ml
  		 */
  		bnx2fc_scsi_done(io_req, DID_ABORT);
  
  		kref_put(&io_req->refcount, bnx2fc_cmd_release);
  		spin_unlock_bh(&tgt->tgt_lock);
  		return SUCCESS;
  	}
  
  	/*
  	 * Only eh_abort processing will remove the IO from
  	 * active_cmd_q before processing the request. this is
  	 * done to avoid race conditions between IOs aborted
  	 * as part of task management completion and eh_abort
  	 * processing
  	 */
  	list_del_init(&io_req->link);
  	io_req->on_active_queue = 0;
  	/* Move IO req to retire queue */
  	list_add_tail(&io_req->link, &tgt->io_retire_queue);
  
  	init_completion(&io_req->tm_done);
  
  	if (test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags)) {
  		printk(KERN_ERR PFX "eh_abort: io_req (xid = 0x%x) "
  				"already in abts processing
  ", io_req->xid);
  		if (cancel_delayed_work(&io_req->timeout_work))
  			kref_put(&io_req->refcount,
  				 bnx2fc_cmd_release); /* drop timer hold */
  		rc = bnx2fc_abts_cleanup(io_req);
  		/* This only occurs when an task abort was requested while ABTS
  		   is in progress.  Setting the IO_CLEANUP flag will skip the
  		   RRQ process in the case when the fw generated SCSI_CMD cmpl
  		   was a result from the ABTS request rather than the CLEANUP
  		   request */
  		set_bit(BNX2FC_FLAG_IO_CLEANUP,	&io_req->req_flags);
  		goto out;
  	}
  
  	/* Cancel the current timer running on this io_req */
  	if (cancel_delayed_work(&io_req->timeout_work))
  		kref_put(&io_req->refcount,
  			 bnx2fc_cmd_release); /* drop timer hold */
  	set_bit(BNX2FC_FLAG_EH_ABORT, &io_req->req_flags);
  	io_req->wait_for_comp = 1;
  	rc = bnx2fc_initiate_abts(io_req);
  	if (rc == FAILED) {
  		bnx2fc_initiate_cleanup(io_req);
  		spin_unlock_bh(&tgt->tgt_lock);
  		wait_for_completion(&io_req->tm_done);
  		spin_lock_bh(&tgt->tgt_lock);
  		io_req->wait_for_comp = 0;
  		goto done;
  	}
  	spin_unlock_bh(&tgt->tgt_lock);
  
  	wait_for_completion(&io_req->tm_done);
  
  	spin_lock_bh(&tgt->tgt_lock);
  	io_req->wait_for_comp = 0;
  	if (test_bit(BNX2FC_FLAG_IO_COMPL, &io_req->req_flags)) {
  		BNX2FC_IO_DBG(io_req, "IO completed in a different context
  ");
  		rc = SUCCESS;
  	} else if (!(test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
  				      &io_req->req_flags))) {
  		/* Let the scsi-ml try to recover this command */
  		printk(KERN_ERR PFX "abort failed, xid = 0x%x
  ",
  		       io_req->xid);
  		rc = bnx2fc_abts_cleanup(io_req);
  		goto out;
  	} else {
  		/*
  		 * We come here even when there was a race condition
  		 * between timeout and abts completion, and abts
  		 * completion happens just in time.
  		 */
  		BNX2FC_IO_DBG(io_req, "abort succeeded
  ");
  		rc = SUCCESS;
  		bnx2fc_scsi_done(io_req, DID_ABORT);
  		kref_put(&io_req->refcount, bnx2fc_cmd_release);
  	}
  done:
  	/* release the reference taken in eh_abort */
  	kref_put(&io_req->refcount, bnx2fc_cmd_release);
  out:
  	spin_unlock_bh(&tgt->tgt_lock);
  	return rc;
  }
  
  void bnx2fc_process_seq_cleanup_compl(struct bnx2fc_cmd *seq_clnp_req,
  				      struct fcoe_task_ctx_entry *task,
  				      u8 rx_state)
  {
  	struct bnx2fc_els_cb_arg *cb_arg = seq_clnp_req->cb_arg;
  	struct bnx2fc_cmd *orig_io_req = cb_arg->aborted_io_req;
  	u32 offset = cb_arg->offset;
  	enum fc_rctl r_ctl = cb_arg->r_ctl;
  	int rc = 0;
  	struct bnx2fc_rport *tgt = orig_io_req->tgt;
  
  	BNX2FC_IO_DBG(orig_io_req, "Entered process_cleanup_compl xid = 0x%x"
  			      "cmd_type = %d
  ",
  		   seq_clnp_req->xid, seq_clnp_req->cmd_type);
  
  	if (rx_state == FCOE_TASK_RX_STATE_IGNORED_SEQUENCE_CLEANUP) {
  		printk(KERN_ERR PFX "seq cleanup ignored - xid = 0x%x
  ",
  			seq_clnp_req->xid);
  		goto free_cb_arg;
  	}
  
  	spin_unlock_bh(&tgt->tgt_lock);
  	rc = bnx2fc_send_srr(orig_io_req, offset, r_ctl);
  	spin_lock_bh(&tgt->tgt_lock);
  
  	if (rc)
  		printk(KERN_ERR PFX "clnup_compl: Unable to send SRR"
  			" IO will abort
  ");
  	seq_clnp_req->cb_arg = NULL;
  	kref_put(&orig_io_req->refcount, bnx2fc_cmd_release);
  free_cb_arg:
  	kfree(cb_arg);
  	return;
  }
  
  void bnx2fc_process_cleanup_compl(struct bnx2fc_cmd *io_req,
  				  struct fcoe_task_ctx_entry *task,
  				  u8 num_rq)
  {
  	BNX2FC_IO_DBG(io_req, "Entered process_cleanup_compl "
  			      "refcnt = %d, cmd_type = %d
  ",
  		   io_req->refcount.refcount.counter, io_req->cmd_type);
  	bnx2fc_scsi_done(io_req, DID_ERROR);
  	kref_put(&io_req->refcount, bnx2fc_cmd_release);
  	if (io_req->wait_for_comp)
  		complete(&io_req->tm_done);
  }
  
  void bnx2fc_process_abts_compl(struct bnx2fc_cmd *io_req,
  			       struct fcoe_task_ctx_entry *task,
  			       u8 num_rq)
  {
  	u32 r_ctl;
  	u32 r_a_tov = FC_DEF_R_A_TOV;
  	u8 issue_rrq = 0;
  	struct bnx2fc_rport *tgt = io_req->tgt;
  
  	BNX2FC_IO_DBG(io_req, "Entered process_abts_compl xid = 0x%x"
  			      "refcnt = %d, cmd_type = %d
  ",
  		   io_req->xid,
  		   io_req->refcount.refcount.counter, io_req->cmd_type);
  
  	if (test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
  				       &io_req->req_flags)) {
  		BNX2FC_IO_DBG(io_req, "Timer context finished processing"
  				" this io
  ");
  		return;
  	}
  
  	/* Do not issue RRQ as this IO is already cleanedup */
  	if (test_and_set_bit(BNX2FC_FLAG_IO_CLEANUP,
  				&io_req->req_flags))
  		goto io_compl;
  
  	/*
  	 * For ABTS issued due to SCSI eh_abort_handler, timeout
  	 * values are maintained by scsi-ml itself. Cancel timeout
  	 * in case ABTS issued as part of task management function
  	 * or due to FW error.
  	 */
  	if (test_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags))
  		if (cancel_delayed_work(&io_req->timeout_work))
  			kref_put(&io_req->refcount,
  				 bnx2fc_cmd_release); /* drop timer hold */
  
  	r_ctl = (u8)task->rxwr_only.union_ctx.comp_info.abts_rsp.r_ctl;
  
  	switch (r_ctl) {
  	case FC_RCTL_BA_ACC:
  		/*
  		 * Dont release this cmd yet. It will be relesed
  		 * after we get RRQ response
  		 */
  		BNX2FC_IO_DBG(io_req, "ABTS response - ACC Send RRQ
  ");
  		issue_rrq = 1;
  		break;
  
  	case FC_RCTL_BA_RJT:
  		BNX2FC_IO_DBG(io_req, "ABTS response - RJT
  ");
  		break;
  	default:
  		printk(KERN_ERR PFX "Unknown ABTS response
  ");
  		break;
  	}
  
  	if (issue_rrq) {
  		BNX2FC_IO_DBG(io_req, "Issue RRQ after R_A_TOV
  ");
  		set_bit(BNX2FC_FLAG_ISSUE_RRQ, &io_req->req_flags);
  	}
  	set_bit(BNX2FC_FLAG_RETIRE_OXID, &io_req->req_flags);
  	bnx2fc_cmd_timer_set(io_req, r_a_tov);
  
  io_compl:
  	if (io_req->wait_for_comp) {
  		if (test_and_clear_bit(BNX2FC_FLAG_EH_ABORT,
  				       &io_req->req_flags))
  			complete(&io_req->tm_done);
  	} else {
  		/*
  		 * We end up here when ABTS is issued as
  		 * in asynchronous context, i.e., as part
  		 * of task management completion, or
  		 * when FW error is received or when the
  		 * ABTS is issued when the IO is timed
  		 * out.
  		 */
  
  		if (io_req->on_active_queue) {
  			list_del_init(&io_req->link);
  			io_req->on_active_queue = 0;
  			/* Move IO req to retire queue */
  			list_add_tail(&io_req->link, &tgt->io_retire_queue);
  		}
  		bnx2fc_scsi_done(io_req, DID_ERROR);
  		kref_put(&io_req->refcount, bnx2fc_cmd_release);
  	}
  }
  
  static void bnx2fc_lun_reset_cmpl(struct bnx2fc_cmd *io_req)
  {
  	struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
  	struct bnx2fc_rport *tgt = io_req->tgt;
  	struct bnx2fc_cmd *cmd, *tmp;
  	u64 tm_lun = sc_cmd->device->lun;
  	u64 lun;
  	int rc = 0;
  
  	/* called with tgt_lock held */
  	BNX2FC_IO_DBG(io_req, "Entered bnx2fc_lun_reset_cmpl
  ");
  	/*
  	 * Walk thru the active_ios queue and ABORT the IO
  	 * that matches with the LUN that was reset
  	 */
  	list_for_each_entry_safe(cmd, tmp, &tgt->active_cmd_queue, link) {
  		BNX2FC_TGT_DBG(tgt, "LUN RST cmpl: scan for pending IOs
  ");
  		lun = cmd->sc_cmd->device->lun;
  		if (lun == tm_lun) {
  			/* Initiate ABTS on this cmd */
  			if (!test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS,
  					      &cmd->req_flags)) {
  				/* cancel the IO timeout */
  				if (cancel_delayed_work(&io_req->timeout_work))
  					kref_put(&io_req->refcount,
  						 bnx2fc_cmd_release);
  							/* timer hold */
  				rc = bnx2fc_initiate_abts(cmd);
  				/* abts shouldn't fail in this context */
  				WARN_ON(rc != SUCCESS);
  			} else
  				printk(KERN_ERR PFX "lun_rst: abts already in"
  					" progress for this IO 0x%x
  ",
  					cmd->xid);
  		}
  	}
  }
  
  static void bnx2fc_tgt_reset_cmpl(struct bnx2fc_cmd *io_req)
  {
  	struct bnx2fc_rport *tgt = io_req->tgt;
  	struct bnx2fc_cmd *cmd, *tmp;
  	int rc = 0;
  
  	/* called with tgt_lock held */
  	BNX2FC_IO_DBG(io_req, "Entered bnx2fc_tgt_reset_cmpl
  ");
  	/*
  	 * Walk thru the active_ios queue and ABORT the IO
  	 * that matches with the LUN that was reset
  	 */
  	list_for_each_entry_safe(cmd, tmp, &tgt->active_cmd_queue, link) {
  		BNX2FC_TGT_DBG(tgt, "TGT RST cmpl: scan for pending IOs
  ");
  		/* Initiate ABTS */
  		if (!test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS,
  							&cmd->req_flags)) {
  			/* cancel the IO timeout */
  			if (cancel_delayed_work(&io_req->timeout_work))
  				kref_put(&io_req->refcount,
  					 bnx2fc_cmd_release); /* timer hold */
  			rc = bnx2fc_initiate_abts(cmd);
  			/* abts shouldn't fail in this context */
  			WARN_ON(rc != SUCCESS);
  
  		} else
  			printk(KERN_ERR PFX "tgt_rst: abts already in progress"
  				" for this IO 0x%x
  ", cmd->xid);
  	}
  }
  
  void bnx2fc_process_tm_compl(struct bnx2fc_cmd *io_req,
  			     struct fcoe_task_ctx_entry *task, u8 num_rq)
  {
  	struct bnx2fc_mp_req *tm_req;
  	struct fc_frame_header *fc_hdr;
  	struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
  	u64 *hdr;
  	u64 *temp_hdr;
  	void *rsp_buf;
  
  	/* Called with tgt_lock held */
  	BNX2FC_IO_DBG(io_req, "Entered process_tm_compl
  ");
  
  	if (!(test_bit(BNX2FC_FLAG_TM_TIMEOUT, &io_req->req_flags)))
  		set_bit(BNX2FC_FLAG_TM_COMPL, &io_req->req_flags);
  	else {
  		/* TM has already timed out and we got
  		 * delayed completion. Ignore completion
  		 * processing.
  		 */
  		return;
  	}
  
  	tm_req = &(io_req->mp_req);
  	fc_hdr = &(tm_req->resp_fc_hdr);
  	hdr = (u64 *)fc_hdr;
  	temp_hdr = (u64 *)
  		&task->rxwr_only.union_ctx.comp_info.mp_rsp.fc_hdr;
  	hdr[0] = cpu_to_be64(temp_hdr[0]);
  	hdr[1] = cpu_to_be64(temp_hdr[1]);
  	hdr[2] = cpu_to_be64(temp_hdr[2]);
  
  	tm_req->resp_len =
  		task->rxwr_only.union_ctx.comp_info.mp_rsp.mp_payload_len;
  
  	rsp_buf = tm_req->resp_buf;
  
  	if (fc_hdr->fh_r_ctl == FC_RCTL_DD_CMD_STATUS) {
  		bnx2fc_parse_fcp_rsp(io_req,
  				     (struct fcoe_fcp_rsp_payload *)
  				     rsp_buf, num_rq);
  		if (io_req->fcp_rsp_code == 0) {
  			/* TM successful */
  			if (tm_req->tm_flags & FCP_TMF_LUN_RESET)
  				bnx2fc_lun_reset_cmpl(io_req);
  			else if (tm_req->tm_flags & FCP_TMF_TGT_RESET)
  				bnx2fc_tgt_reset_cmpl(io_req);
  		}
  	} else {
  		printk(KERN_ERR PFX "tmf's fc_hdr r_ctl = 0x%x
  ",
  			fc_hdr->fh_r_ctl);
  	}
  	if (!sc_cmd->SCp.ptr) {
  		printk(KERN_ERR PFX "tm_compl: SCp.ptr is NULL
  ");
  		return;
  	}
  	switch (io_req->fcp_status) {
  	case FC_GOOD:
  		if (io_req->cdb_status == 0) {
  			/* Good IO completion */
  			sc_cmd->result = DID_OK << 16;
  		} else {
  			/* Transport status is good, SCSI status not good */
  			sc_cmd->result = (DID_OK << 16) | io_req->cdb_status;
  		}
  		if (io_req->fcp_resid)
  			scsi_set_resid(sc_cmd, io_req->fcp_resid);
  		break;
  
  	default:
  		BNX2FC_IO_DBG(io_req, "process_tm_compl: fcp_status = %d
  ",
  			   io_req->fcp_status);
  		break;
  	}
  
  	sc_cmd = io_req->sc_cmd;
  	io_req->sc_cmd = NULL;
  
  	/* check if the io_req exists in tgt's tmf_q */
  	if (io_req->on_tmf_queue) {
  
  		list_del_init(&io_req->link);
  		io_req->on_tmf_queue = 0;
  	} else {
  
  		printk(KERN_ERR PFX "Command not on active_cmd_queue!
  ");
  		return;
  	}
  
  	sc_cmd->SCp.ptr = NULL;
  	sc_cmd->scsi_done(sc_cmd);
  
  	kref_put(&io_req->refcount, bnx2fc_cmd_release);
  	if (io_req->wait_for_comp) {
  		BNX2FC_IO_DBG(io_req, "tm_compl - wake up the waiter
  ");
  		complete(&io_req->tm_done);
  	}
  }
  
  static int bnx2fc_split_bd(struct bnx2fc_cmd *io_req, u64 addr, int sg_len,
  			   int bd_index)
  {
  	struct fcoe_bd_ctx *bd = io_req->bd_tbl->bd_tbl;
  	int frag_size, sg_frags;
  
  	sg_frags = 0;
  	while (sg_len) {
  		if (sg_len >= BNX2FC_BD_SPLIT_SZ)
  			frag_size = BNX2FC_BD_SPLIT_SZ;
  		else
  			frag_size = sg_len;
  		bd[bd_index + sg_frags].buf_addr_lo = addr & 0xffffffff;
  		bd[bd_index + sg_frags].buf_addr_hi  = addr >> 32;
  		bd[bd_index + sg_frags].buf_len = (u16)frag_size;
  		bd[bd_index + sg_frags].flags = 0;
  
  		addr += (u64) frag_size;
  		sg_frags++;
  		sg_len -= frag_size;
  	}
  	return sg_frags;
  
  }
  
  static int bnx2fc_map_sg(struct bnx2fc_cmd *io_req)
  {
  	struct bnx2fc_interface *interface = io_req->port->priv;
  	struct bnx2fc_hba *hba = interface->hba;
  	struct scsi_cmnd *sc = io_req->sc_cmd;
  	struct fcoe_bd_ctx *bd = io_req->bd_tbl->bd_tbl;
  	struct scatterlist *sg;
  	int byte_count = 0;
  	int sg_count = 0;
  	int bd_count = 0;
  	int sg_frags;
  	unsigned int sg_len;
  	u64 addr;
  	int i;
  
  	/*
  	 * Use dma_map_sg directly to ensure we're using the correct
  	 * dev struct off of pcidev.
  	 */
  	sg_count = dma_map_sg(&hba->pcidev->dev, scsi_sglist(sc),
  			      scsi_sg_count(sc), sc->sc_data_direction);
  	scsi_for_each_sg(sc, sg, sg_count, i) {
  		sg_len = sg_dma_len(sg);
  		addr = sg_dma_address(sg);
  		if (sg_len > BNX2FC_MAX_BD_LEN) {
  			sg_frags = bnx2fc_split_bd(io_req, addr, sg_len,
  						   bd_count);
  		} else {
  
  			sg_frags = 1;
  			bd[bd_count].buf_addr_lo = addr & 0xffffffff;
  			bd[bd_count].buf_addr_hi  = addr >> 32;
  			bd[bd_count].buf_len = (u16)sg_len;
  			bd[bd_count].flags = 0;
  		}
  		bd_count += sg_frags;
  		byte_count += sg_len;
  	}
  	if (byte_count != scsi_bufflen(sc))
  		printk(KERN_ERR PFX "byte_count = %d != scsi_bufflen = %d, "
  			"task_id = 0x%x
  ", byte_count, scsi_bufflen(sc),
  			io_req->xid);
  	return bd_count;
  }
  
  static int bnx2fc_build_bd_list_from_sg(struct bnx2fc_cmd *io_req)
  {
  	struct scsi_cmnd *sc = io_req->sc_cmd;
  	struct fcoe_bd_ctx *bd = io_req->bd_tbl->bd_tbl;
  	int bd_count;
  
  	if (scsi_sg_count(sc)) {
  		bd_count = bnx2fc_map_sg(io_req);
  		if (bd_count == 0)
  			return -ENOMEM;
  	} else {
  		bd_count = 0;
  		bd[0].buf_addr_lo = bd[0].buf_addr_hi = 0;
  		bd[0].buf_len = bd[0].flags = 0;
  	}
  	io_req->bd_tbl->bd_valid = bd_count;
  
  	return 0;
  }
  
  static void bnx2fc_unmap_sg_list(struct bnx2fc_cmd *io_req)
  {
  	struct scsi_cmnd *sc = io_req->sc_cmd;
  	struct bnx2fc_interface *interface = io_req->port->priv;
  	struct bnx2fc_hba *hba = interface->hba;
  
  	/*
  	 * Use dma_unmap_sg directly to ensure we're using the correct
  	 * dev struct off of pcidev.
  	 */
  	if (io_req->bd_tbl->bd_valid && sc && scsi_sg_count(sc)) {
  		dma_unmap_sg(&hba->pcidev->dev, scsi_sglist(sc),
  		    scsi_sg_count(sc), sc->sc_data_direction);
  		io_req->bd_tbl->bd_valid = 0;
  	}
  }
  
  void bnx2fc_build_fcp_cmnd(struct bnx2fc_cmd *io_req,
  				  struct fcp_cmnd *fcp_cmnd)
  {
  	struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
  
  	memset(fcp_cmnd, 0, sizeof(struct fcp_cmnd));
  
  	int_to_scsilun(sc_cmd->device->lun, &fcp_cmnd->fc_lun);
  
  	fcp_cmnd->fc_dl = htonl(io_req->data_xfer_len);
  	memcpy(fcp_cmnd->fc_cdb, sc_cmd->cmnd, sc_cmd->cmd_len);
  
  	fcp_cmnd->fc_cmdref = 0;
  	fcp_cmnd->fc_pri_ta = 0;
  	fcp_cmnd->fc_tm_flags = io_req->mp_req.tm_flags;
  	fcp_cmnd->fc_flags = io_req->io_req_flags;
  	fcp_cmnd->fc_pri_ta = FCP_PTA_SIMPLE;
  }
  
  static void bnx2fc_parse_fcp_rsp(struct bnx2fc_cmd *io_req,
  				 struct fcoe_fcp_rsp_payload *fcp_rsp,
  				 u8 num_rq)
  {
  	struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
  	struct bnx2fc_rport *tgt = io_req->tgt;
  	u8 rsp_flags = fcp_rsp->fcp_flags.flags;
  	u32 rq_buff_len = 0;
  	int i;
  	unsigned char *rq_data;
  	unsigned char *dummy;
  	int fcp_sns_len = 0;
  	int fcp_rsp_len = 0;
  
  	io_req->fcp_status = FC_GOOD;
  	io_req->fcp_resid = 0;
  	if (rsp_flags & (FCOE_FCP_RSP_FLAGS_FCP_RESID_OVER |
  	    FCOE_FCP_RSP_FLAGS_FCP_RESID_UNDER))
  		io_req->fcp_resid = fcp_rsp->fcp_resid;
  
  	io_req->scsi_comp_flags = rsp_flags;
  	CMD_SCSI_STATUS(sc_cmd) = io_req->cdb_status =
  				fcp_rsp->scsi_status_code;
  
  	/* Fetch fcp_rsp_info and fcp_sns_info if available */
  	if (num_rq) {
  
  		/*
  		 * We do not anticipate num_rq >1, as the linux defined
  		 * SCSI_SENSE_BUFFERSIZE is 96 bytes + 8 bytes of FCP_RSP_INFO
  		 * 256 bytes of single rq buffer is good enough to hold this.
  		 */
  
  		if (rsp_flags &
  		    FCOE_FCP_RSP_FLAGS_FCP_RSP_LEN_VALID) {
  			fcp_rsp_len = rq_buff_len
  					= fcp_rsp->fcp_rsp_len;
  		}
  
  		if (rsp_flags &
  		    FCOE_FCP_RSP_FLAGS_FCP_SNS_LEN_VALID) {
  			fcp_sns_len = fcp_rsp->fcp_sns_len;
  			rq_buff_len += fcp_rsp->fcp_sns_len;
  		}
  
  		io_req->fcp_rsp_len = fcp_rsp_len;
  		io_req->fcp_sns_len = fcp_sns_len;
  
  		if (rq_buff_len > num_rq * BNX2FC_RQ_BUF_SZ) {
  			/* Invalid sense sense length. */
  			printk(KERN_ERR PFX "invalid sns length %d
  ",
  				rq_buff_len);
  			/* reset rq_buff_len */
  			rq_buff_len =  num_rq * BNX2FC_RQ_BUF_SZ;
  		}
  
  		rq_data = bnx2fc_get_next_rqe(tgt, 1);
  
  		if (num_rq > 1) {
  			/* We do not need extra sense data */
  			for (i = 1; i < num_rq; i++)
  				dummy = bnx2fc_get_next_rqe(tgt, 1);
  		}
  
  		/* fetch fcp_rsp_code */
  		if ((fcp_rsp_len == 4) || (fcp_rsp_len == 8)) {
  			/* Only for task management function */
  			io_req->fcp_rsp_code = rq_data[3];
  			printk(KERN_ERR PFX "fcp_rsp_code = %d
  ",
  				io_req->fcp_rsp_code);
  		}
  
  		/* fetch sense data */
  		rq_data += fcp_rsp_len;
  
  		if (fcp_sns_len > SCSI_SENSE_BUFFERSIZE) {
  			printk(KERN_ERR PFX "Truncating sense buffer
  ");
  			fcp_sns_len = SCSI_SENSE_BUFFERSIZE;
  		}
  
  		memset(sc_cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
  		if (fcp_sns_len)
  			memcpy(sc_cmd->sense_buffer, rq_data, fcp_sns_len);
  
  		/* return RQ entries */
  		for (i = 0; i < num_rq; i++)
  			bnx2fc_return_rqe(tgt, 1);
  	}
  }
  
  /**
   * bnx2fc_queuecommand - Queuecommand function of the scsi template
   *
   * @host:	The Scsi_Host the command was issued to
   * @sc_cmd:	struct scsi_cmnd to be executed
   *
   * This is the IO strategy routine, called by SCSI-ML
   **/
  int bnx2fc_queuecommand(struct Scsi_Host *host,
  			struct scsi_cmnd *sc_cmd)
  {
  	struct fc_lport *lport = shost_priv(host);
  	struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
  	struct fc_rport_libfc_priv *rp = rport->dd_data;
  	struct bnx2fc_rport *tgt;
  	struct bnx2fc_cmd *io_req;
  	int rc = 0;
  	int rval;
  
  	rval = fc_remote_port_chkready(rport);
  	if (rval) {
  		sc_cmd->result = rval;
  		sc_cmd->scsi_done(sc_cmd);
  		return 0;
  	}
  
  	if ((lport->state != LPORT_ST_READY) || !(lport->link_up)) {
  		rc = SCSI_MLQUEUE_HOST_BUSY;
  		goto exit_qcmd;
  	}
  
  	/* rport and tgt are allocated together, so tgt should be non-NULL */
  	tgt = (struct bnx2fc_rport *)&rp[1];
  
  	if (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags)) {
  		/*
  		 * Session is not offloaded yet. Let SCSI-ml retry
  		 * the command.
  		 */
  		rc = SCSI_MLQUEUE_TARGET_BUSY;
  		goto exit_qcmd;
  	}
  	if (tgt->retry_delay_timestamp) {
  		if (time_after(jiffies, tgt->retry_delay_timestamp)) {
  			tgt->retry_delay_timestamp = 0;
  		} else {
  			/* If retry_delay timer is active, flow off the ML */
  			rc = SCSI_MLQUEUE_TARGET_BUSY;
  			goto exit_qcmd;
  		}
  	}
  
  	spin_lock_bh(&tgt->tgt_lock);
  
  	io_req = bnx2fc_cmd_alloc(tgt);
  	if (!io_req) {
  		rc = SCSI_MLQUEUE_HOST_BUSY;
  		goto exit_qcmd_tgtlock;
  	}
  	io_req->sc_cmd = sc_cmd;
  
  	if (bnx2fc_post_io_req(tgt, io_req)) {
  		printk(KERN_ERR PFX "Unable to post io_req
  ");
  		rc = SCSI_MLQUEUE_HOST_BUSY;
  		goto exit_qcmd_tgtlock;
  	}
  
  exit_qcmd_tgtlock:
  	spin_unlock_bh(&tgt->tgt_lock);
  exit_qcmd:
  	return rc;
  }
  
  void bnx2fc_process_scsi_cmd_compl(struct bnx2fc_cmd *io_req,
  				   struct fcoe_task_ctx_entry *task,
  				   u8 num_rq)
  {
  	struct fcoe_fcp_rsp_payload *fcp_rsp;
  	struct bnx2fc_rport *tgt = io_req->tgt;
  	struct scsi_cmnd *sc_cmd;
  	struct Scsi_Host *host;
  
  
  	/* scsi_cmd_cmpl is called with tgt lock held */
  
  	if (test_and_set_bit(BNX2FC_FLAG_IO_COMPL, &io_req->req_flags)) {
  		/* we will not receive ABTS response for this IO */
  		BNX2FC_IO_DBG(io_req, "Timer context finished processing "
  			   "this scsi cmd
  ");
  	}
  
  	/* Cancel the timeout_work, as we received IO completion */
  	if (cancel_delayed_work(&io_req->timeout_work))
  		kref_put(&io_req->refcount,
  			 bnx2fc_cmd_release); /* drop timer hold */
  
  	sc_cmd = io_req->sc_cmd;
  	if (sc_cmd == NULL) {
  		printk(KERN_ERR PFX "scsi_cmd_compl - sc_cmd is NULL
  ");
  		return;
  	}
  
  	/* Fetch fcp_rsp from task context and perform cmd completion */
  	fcp_rsp = (struct fcoe_fcp_rsp_payload *)
  		   &(task->rxwr_only.union_ctx.comp_info.fcp_rsp.payload);
  
  	/* parse fcp_rsp and obtain sense data from RQ if available */
  	bnx2fc_parse_fcp_rsp(io_req, fcp_rsp, num_rq);
  
  	host = sc_cmd->device->host;
  	if (!sc_cmd->SCp.ptr) {
  		printk(KERN_ERR PFX "SCp.ptr is NULL
  ");
  		return;
  	}
  
  	if (io_req->on_active_queue) {
  		list_del_init(&io_req->link);
  		io_req->on_active_queue = 0;
  		/* Move IO req to retire queue */
  		list_add_tail(&io_req->link, &tgt->io_retire_queue);
  	} else {
  		/* This should not happen, but could have been pulled
  		 * by bnx2fc_flush_active_ios(), or during a race
  		 * between command abort and (late) completion.
  		 */
  		BNX2FC_IO_DBG(io_req, "xid not on active_cmd_queue
  ");
  		if (io_req->wait_for_comp)
  			if (test_and_clear_bit(BNX2FC_FLAG_EH_ABORT,
  					       &io_req->req_flags))
  				complete(&io_req->tm_done);
  	}
  
  	bnx2fc_unmap_sg_list(io_req);
  	io_req->sc_cmd = NULL;
  
  	switch (io_req->fcp_status) {
  	case FC_GOOD:
  		if (io_req->cdb_status == 0) {
  			/* Good IO completion */
  			sc_cmd->result = DID_OK << 16;
  		} else {
  			/* Transport status is good, SCSI status not good */
  			BNX2FC_IO_DBG(io_req, "scsi_cmpl: cdb_status = %d"
  				 " fcp_resid = 0x%x
  ",
  				io_req->cdb_status, io_req->fcp_resid);
  			sc_cmd->result = (DID_OK << 16) | io_req->cdb_status;
  
  			if (io_req->cdb_status == SAM_STAT_TASK_SET_FULL ||
  			    io_req->cdb_status == SAM_STAT_BUSY) {
  				/* Set the jiffies + retry_delay_timer * 100ms
  				   for the rport/tgt */
  				tgt->retry_delay_timestamp = jiffies +
  					fcp_rsp->retry_delay_timer * HZ / 10;
  			}
  
  		}
  		if (io_req->fcp_resid)
  			scsi_set_resid(sc_cmd, io_req->fcp_resid);
  		break;
  	default:
  		printk(KERN_ERR PFX "scsi_cmd_compl: fcp_status = %d
  ",
  			io_req->fcp_status);
  		break;
  	}
  	sc_cmd->SCp.ptr = NULL;
  	sc_cmd->scsi_done(sc_cmd);
  	kref_put(&io_req->refcount, bnx2fc_cmd_release);
  }
  
  int bnx2fc_post_io_req(struct bnx2fc_rport *tgt,
  			       struct bnx2fc_cmd *io_req)
  {
  	struct fcoe_task_ctx_entry *task;
  	struct fcoe_task_ctx_entry *task_page;
  	struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
  	struct fcoe_port *port = tgt->port;
  	struct bnx2fc_interface *interface = port->priv;
  	struct bnx2fc_hba *hba = interface->hba;
  	struct fc_lport *lport = port->lport;
  	struct fc_stats *stats;
  	int task_idx, index;
  	u16 xid;
  
  	/* bnx2fc_post_io_req() is called with the tgt_lock held */
  
  	/* Initialize rest of io_req fields */
  	io_req->cmd_type = BNX2FC_SCSI_CMD;
  	io_req->port = port;
  	io_req->tgt = tgt;
  	io_req->data_xfer_len = scsi_bufflen(sc_cmd);
  	sc_cmd->SCp.ptr = (char *)io_req;
  
  	stats = per_cpu_ptr(lport->stats, get_cpu());
  	if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE) {
  		io_req->io_req_flags = BNX2FC_READ;
  		stats->InputRequests++;
  		stats->InputBytes += io_req->data_xfer_len;
  	} else if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) {
  		io_req->io_req_flags = BNX2FC_WRITE;
  		stats->OutputRequests++;
  		stats->OutputBytes += io_req->data_xfer_len;
  	} else {
  		io_req->io_req_flags = 0;
  		stats->ControlRequests++;
  	}
  	put_cpu();
  
  	xid = io_req->xid;
  
  	/* Build buffer descriptor list for firmware from sg list */
  	if (bnx2fc_build_bd_list_from_sg(io_req)) {
  		printk(KERN_ERR PFX "BD list creation failed
  ");
  		kref_put(&io_req->refcount, bnx2fc_cmd_release);
  		return -EAGAIN;
  	}
  
  	task_idx = xid / BNX2FC_TASKS_PER_PAGE;
  	index = xid % BNX2FC_TASKS_PER_PAGE;
  
  	/* Initialize task context for this IO request */
  	task_page = (struct fcoe_task_ctx_entry *) hba->task_ctx[task_idx];
  	task = &(task_page[index]);
  	bnx2fc_init_task(io_req, task);
  
  	if (tgt->flush_in_prog) {
  		printk(KERN_ERR PFX "Flush in progress..Host Busy
  ");
  		kref_put(&io_req->refcount, bnx2fc_cmd_release);
  		return -EAGAIN;
  	}
  
  	if (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags)) {
  		printk(KERN_ERR PFX "Session not ready...post_io
  ");
  		kref_put(&io_req->refcount, bnx2fc_cmd_release);
  		return -EAGAIN;
  	}
  
  	/* Time IO req */
  	if (tgt->io_timeout)
  		bnx2fc_cmd_timer_set(io_req, BNX2FC_IO_TIMEOUT);
  	/* Obtain free SQ entry */
  	bnx2fc_add_2_sq(tgt, xid);
  
  	/* Enqueue the io_req to active_cmd_queue */
  
  	io_req->on_active_queue = 1;
  	/* move io_req from pending_queue to active_queue */
  	list_add_tail(&io_req->link, &tgt->active_cmd_queue);
  
  	/* Ring doorbell */
  	bnx2fc_ring_doorbell(tgt);
  	return 0;
  }