/*
 * bnx2i_iscsi.c: QLogic NetXtreme II iSCSI driver.
 *
 * Copyright (c) 2006 - 2013 Broadcom Corporation
 * Copyright (c) 2007, 2008 Red Hat, Inc.  All rights reserved.
 * Copyright (c) 2007, 2008 Mike Christie
 * Copyright (c) 2014, 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: Anil Veerabhadrappa (anilgv@broadcom.com)
 * Previously Maintained by: Eddie Wai (eddie.wai@broadcom.com)
 * Maintained by: QLogic-Storage-Upstream@qlogic.com
 */

#include <linux/slab.h>
#include <scsi/scsi_tcq.h>
#include <scsi/libiscsi.h>
#include "bnx2i.h"

struct scsi_transport_template *bnx2i_scsi_xport_template;
struct iscsi_transport bnx2i_iscsi_transport;
static const struct scsi_host_template bnx2i_host_template;

/*
 * Global endpoint resource info
 */
static DEFINE_SPINLOCK(bnx2i_resc_lock); /* protects global resources */

DECLARE_PER_CPU(struct bnx2i_percpu_s, bnx2i_percpu);

static int bnx2i_adapter_ready(struct bnx2i_hba *hba)
{
        int retval = 0;

        if (!hba || !test_bit(ADAPTER_STATE_UP, &hba->adapter_state) ||
            test_bit(ADAPTER_STATE_GOING_DOWN, &hba->adapter_state) ||
            test_bit(ADAPTER_STATE_LINK_DOWN, &hba->adapter_state))
                retval = -EPERM;
        return retval;
}

/**
 * bnx2i_get_write_cmd_bd_idx - identifies various BD bookmarks
 * @cmd:                iscsi cmd struct pointer
 * @buf_off:            absolute buffer offset
 * @start_bd_off:       u32 pointer to return the offset within the BD
 *                      indicated by 'start_bd_idx' on which 'buf_off' falls
 * @start_bd_idx:       index of the BD on which 'buf_off' falls
 *
 * identifies & marks various bd info for scsi command's imm data,
 * unsolicited data and the first solicited data seq.
 */
static void bnx2i_get_write_cmd_bd_idx(struct bnx2i_cmd *cmd, u32 buf_off,
                                       u32 *start_bd_off, u32 *start_bd_idx)
{
        struct iscsi_bd *bd_tbl = cmd->io_tbl.bd_tbl;
        u32 cur_offset = 0;
        u32 cur_bd_idx = 0;

        if (buf_off) {
                while (buf_off >= (cur_offset + bd_tbl->buffer_length)) {
                        cur_offset += bd_tbl->buffer_length;
                        cur_bd_idx++;
                        bd_tbl++;
                }
        }

        *start_bd_off = buf_off - cur_offset;
        *start_bd_idx = cur_bd_idx;
}

/**
 * bnx2i_setup_write_cmd_bd_info - sets up BD various information
 * @task:       transport layer's cmd struct pointer
 *
 * identifies & marks various bd info for scsi command's immediate data,
 * unsolicited data and first solicited data seq which includes BD start
 * index & BD buf off. his function takes into account iscsi parameter such
 * as immediate data and unsolicited data is support on this connection.
 */
static void bnx2i_setup_write_cmd_bd_info(struct iscsi_task *task)
{
        struct bnx2i_cmd *cmd = task->dd_data;
        u32 start_bd_offset;
        u32 start_bd_idx;
        u32 buffer_offset = 0;
        u32 cmd_len = cmd->req.total_data_transfer_length;

        /* if ImmediateData is turned off & IntialR2T is turned on,
         * there will be no immediate or unsolicited data, just return.
         */
        if (!iscsi_task_has_unsol_data(task) && !task->imm_count)
                return;

        /* Immediate data */
        buffer_offset += task->imm_count;
        if (task->imm_count == cmd_len)
                return;

        if (iscsi_task_has_unsol_data(task)) {
                bnx2i_get_write_cmd_bd_idx(cmd, buffer_offset,
                                           &start_bd_offset, &start_bd_idx);
                cmd->req.ud_buffer_offset = start_bd_offset;
                cmd->req.ud_start_bd_index = start_bd_idx;
                buffer_offset += task->unsol_r2t.data_length;
        }

        if (buffer_offset != cmd_len) {
                bnx2i_get_write_cmd_bd_idx(cmd, buffer_offset,
                                           &start_bd_offset, &start_bd_idx);
                if ((start_bd_offset > task->conn->session->first_burst) ||
                    (start_bd_idx > scsi_sg_count(cmd->scsi_cmd))) {
                        int i = 0;

                        iscsi_conn_printk(KERN_ALERT, task->conn,
                                          "bnx2i- error, buf offset 0x%x "
                                          "bd_valid %d use_sg %d\n",
                                          buffer_offset, cmd->io_tbl.bd_valid,
                                          scsi_sg_count(cmd->scsi_cmd));
                        for (i = 0; i < cmd->io_tbl.bd_valid; i++)
                                iscsi_conn_printk(KERN_ALERT, task->conn,
                                                  "bnx2i err, bd[%d]: len %x\n",
                                                  i, cmd->io_tbl.bd_tbl[i].\
                                                  buffer_length);
                }
                cmd->req.sd_buffer_offset = start_bd_offset;
                cmd->req.sd_start_bd_index = start_bd_idx;
        }
}



/**
 * bnx2i_map_scsi_sg - maps IO buffer and prepares the BD table
 * @hba:        adapter instance
 * @cmd:        iscsi cmd struct pointer
 *
 * map SG list
 */
static int bnx2i_map_scsi_sg(struct bnx2i_hba *hba, struct bnx2i_cmd *cmd)
{
        struct scsi_cmnd *sc = cmd->scsi_cmd;
        struct iscsi_bd *bd = cmd->io_tbl.bd_tbl;
        struct scatterlist *sg;
        int byte_count = 0;
        int bd_count = 0;
        int sg_count;
        int sg_len;
        u64 addr;
        int i;

        BUG_ON(scsi_sg_count(sc) > ISCSI_MAX_BDS_PER_CMD);

        sg_count = scsi_dma_map(sc);

        scsi_for_each_sg(sc, sg, sg_count, i) {
                sg_len = sg_dma_len(sg);
                addr = (u64) sg_dma_address(sg);
                bd[bd_count].buffer_addr_lo = addr & 0xffffffff;
                bd[bd_count].buffer_addr_hi = addr >> 32;
                bd[bd_count].buffer_length = sg_len;
                bd[bd_count].flags = 0;
                if (bd_count == 0)
                        bd[bd_count].flags = ISCSI_BD_FIRST_IN_BD_CHAIN;

                byte_count += sg_len;
                bd_count++;
        }

        if (bd_count)
                bd[bd_count - 1].flags |= ISCSI_BD_LAST_IN_BD_CHAIN;

        BUG_ON(byte_count != scsi_bufflen(sc));
        return bd_count;
}

/**
 * bnx2i_iscsi_map_sg_list - maps SG list
 * @cmd:        iscsi cmd struct pointer
 *
 * creates BD list table for the command
 */
static void bnx2i_iscsi_map_sg_list(struct bnx2i_cmd *cmd)
{
        int bd_count;

        bd_count  = bnx2i_map_scsi_sg(cmd->conn->hba, cmd);
        if (!bd_count) {
                struct iscsi_bd *bd = cmd->io_tbl.bd_tbl;

                bd[0].buffer_addr_lo = bd[0].buffer_addr_hi = 0;
                bd[0].buffer_length = bd[0].flags = 0;
        }
        cmd->io_tbl.bd_valid = bd_count;
}


/**
 * bnx2i_iscsi_unmap_sg_list - unmaps SG list
 * @cmd:        iscsi cmd struct pointer
 *
 * unmap IO buffers and invalidate the BD table
 */
void bnx2i_iscsi_unmap_sg_list(struct bnx2i_cmd *cmd)
{
        struct scsi_cmnd *sc = cmd->scsi_cmd;

        if (cmd->io_tbl.bd_valid && sc) {
                scsi_dma_unmap(sc);
                cmd->io_tbl.bd_valid = 0;
        }
}

static void bnx2i_setup_cmd_wqe_template(struct bnx2i_cmd *cmd)
{
        memset(&cmd->req, 0x00, sizeof(cmd->req));
        cmd->req.op_code = 0xFF;
        cmd->req.bd_list_addr_lo = (u32) cmd->io_tbl.bd_tbl_dma;
        cmd->req.bd_list_addr_hi =
                (u32) ((u64) cmd->io_tbl.bd_tbl_dma >> 32);

}


/**
 * bnx2i_bind_conn_to_iscsi_cid - bind conn structure to 'iscsi_cid'
 * @hba:        pointer to adapter instance
 * @bnx2i_conn: pointer to iscsi connection
 * @iscsi_cid:  iscsi context ID, range 0 - (MAX_CONN - 1)
 *
 * update iscsi cid table entry with connection pointer. This enables
 *      driver to quickly get hold of connection structure pointer in
 *      completion/interrupt thread using iscsi context ID
 */
static int bnx2i_bind_conn_to_iscsi_cid(struct bnx2i_hba *hba,
                                        struct bnx2i_conn *bnx2i_conn,
                                        u32 iscsi_cid)
{
        if (hba && hba->cid_que.conn_cid_tbl[iscsi_cid]) {
                iscsi_conn_printk(KERN_ALERT, bnx2i_conn->cls_conn->dd_data,
                                 "conn bind - entry #%d not free\n", iscsi_cid);
                return -EBUSY;
        }

        hba->cid_que.conn_cid_tbl[iscsi_cid] = bnx2i_conn;
        return 0;
}


/**
 * bnx2i_get_conn_from_id - maps an iscsi cid to corresponding conn ptr
 * @hba:        pointer to adapter instance
 * @iscsi_cid:  iscsi context ID, range 0 - (MAX_CONN - 1)
 */
struct bnx2i_conn *bnx2i_get_conn_from_id(struct bnx2i_hba *hba,
                                          u16 iscsi_cid)
{
        if (!hba->cid_que.conn_cid_tbl) {
                printk(KERN_ERR "bnx2i: ERROR - missing conn<->cid table\n");
                return NULL;

        } else if (iscsi_cid >= hba->max_active_conns) {
                printk(KERN_ERR "bnx2i: wrong cid #%d\n", iscsi_cid);
                return NULL;
        }
        return hba->cid_que.conn_cid_tbl[iscsi_cid];
}


/**
 * bnx2i_alloc_iscsi_cid - allocates a iscsi_cid from free pool
 * @hba:        pointer to adapter instance
 */
static u32 bnx2i_alloc_iscsi_cid(struct bnx2i_hba *hba)
{
        int idx;

        if (!hba->cid_que.cid_free_cnt)
                return -1;

        idx = hba->cid_que.cid_q_cons_idx;
        hba->cid_que.cid_q_cons_idx++;
        if (hba->cid_que.cid_q_cons_idx == hba->cid_que.cid_q_max_idx)
                hba->cid_que.cid_q_cons_idx = 0;

        hba->cid_que.cid_free_cnt--;
        return hba->cid_que.cid_que[idx];
}


/**
 * bnx2i_free_iscsi_cid - returns tcp port to free list
 * @hba:                pointer to adapter instance
 * @iscsi_cid:          iscsi context ID to free
 */
static void bnx2i_free_iscsi_cid(struct bnx2i_hba *hba, u16 iscsi_cid)
{
        int idx;

        if (iscsi_cid == (u16) -1)
                return;

        hba->cid_que.cid_free_cnt++;

        idx = hba->cid_que.cid_q_prod_idx;
        hba->cid_que.cid_que[idx] = iscsi_cid;
        hba->cid_que.conn_cid_tbl[iscsi_cid] = NULL;
        hba->cid_que.cid_q_prod_idx++;
        if (hba->cid_que.cid_q_prod_idx == hba->cid_que.cid_q_max_idx)
                hba->cid_que.cid_q_prod_idx = 0;
}


/**
 * bnx2i_setup_free_cid_que - sets up free iscsi cid queue
 * @hba:        pointer to adapter instance
 *
 * allocates memory for iscsi cid queue & 'cid - conn ptr' mapping table,
 *      and initialize table attributes
 */
static int bnx2i_setup_free_cid_que(struct bnx2i_hba *hba)
{
        int mem_size;
        int i;

        mem_size = hba->max_active_conns * sizeof(u32);
        mem_size = (mem_size + (PAGE_SIZE - 1)) & PAGE_MASK;

        hba->cid_que.cid_que_base = kmalloc(mem_size, GFP_KERNEL);
        if (!hba->cid_que.cid_que_base)
                return -ENOMEM;

        mem_size = hba->max_active_conns * sizeof(struct bnx2i_conn *);
        mem_size = (mem_size + (PAGE_SIZE - 1)) & PAGE_MASK;
        hba->cid_que.conn_cid_tbl = kmalloc(mem_size, GFP_KERNEL);
        if (!hba->cid_que.conn_cid_tbl) {
                kfree(hba->cid_que.cid_que_base);
                hba->cid_que.cid_que_base = NULL;
                return -ENOMEM;
        }

        hba->cid_que.cid_que = (u32 *)hba->cid_que.cid_que_base;
        hba->cid_que.cid_q_prod_idx = 0;
        hba->cid_que.cid_q_cons_idx = 0;
        hba->cid_que.cid_q_max_idx = hba->max_active_conns;
        hba->cid_que.cid_free_cnt = hba->max_active_conns;

        for (i = 0; i < hba->max_active_conns; i++) {
                hba->cid_que.cid_que[i] = i;
                hba->cid_que.conn_cid_tbl[i] = NULL;
        }
        return 0;
}


/**
 * bnx2i_release_free_cid_que - releases 'iscsi_cid' queue resources
 * @hba:        pointer to adapter instance
 */
static void bnx2i_release_free_cid_que(struct bnx2i_hba *hba)
{
        kfree(hba->cid_que.cid_que_base);
        hba->cid_que.cid_que_base = NULL;

        kfree(hba->cid_que.conn_cid_tbl);
        hba->cid_que.conn_cid_tbl = NULL;
}


/**
 * bnx2i_alloc_ep - allocates ep structure from global pool
 * @hba:        pointer to adapter instance
 *
 * routine allocates a free endpoint structure from global pool and
 *      a tcp port to be used for this connection.  Global resource lock,
 *      'bnx2i_resc_lock' is held while accessing shared global data structures
 */
static struct iscsi_endpoint *bnx2i_alloc_ep(struct bnx2i_hba *hba)
{
        struct iscsi_endpoint *ep;
        struct bnx2i_endpoint *bnx2i_ep;
        u32 ec_div;

        ep = iscsi_create_endpoint(sizeof(*bnx2i_ep));
        if (!ep) {
                printk(KERN_ERR "bnx2i: Could not allocate ep\n");
                return NULL;
        }

        bnx2i_ep = ep->dd_data;
        bnx2i_ep->cls_ep = ep;
        INIT_LIST_HEAD(&bnx2i_ep->link);
        bnx2i_ep->state = EP_STATE_IDLE;
        bnx2i_ep->ep_iscsi_cid = (u16) -1;
        bnx2i_ep->hba = hba;
        bnx2i_ep->hba_age = hba->age;

        ec_div = event_coal_div;
        while (ec_div >>= 1)
                bnx2i_ep->ec_shift += 1;

        hba->ofld_conns_active++;
        init_waitqueue_head(&bnx2i_ep->ofld_wait);
        return ep;
}


/**
 * bnx2i_free_ep - free endpoint
 * @ep:         pointer to iscsi endpoint structure
 */
static void bnx2i_free_ep(struct iscsi_endpoint *ep)
{
        struct bnx2i_endpoint *bnx2i_ep = ep->dd_data;
        unsigned long flags;

        spin_lock_irqsave(&bnx2i_resc_lock, flags);
        bnx2i_ep->state = EP_STATE_IDLE;
        bnx2i_ep->hba->ofld_conns_active--;

        if (bnx2i_ep->ep_iscsi_cid != (u16) -1)
                bnx2i_free_iscsi_cid(bnx2i_ep->hba, bnx2i_ep->ep_iscsi_cid);

        if (bnx2i_ep->conn) {
                bnx2i_ep->conn->ep = NULL;
                bnx2i_ep->conn = NULL;
        }

        bnx2i_ep->hba = NULL;
        spin_unlock_irqrestore(&bnx2i_resc_lock, flags);
        iscsi_destroy_endpoint(ep);
}


/**
 * bnx2i_alloc_bdt - allocates buffer descriptor (BD) table for the command
 * @hba:        adapter instance pointer
 * @session:    iscsi session pointer
 * @cmd:        iscsi command structure
 */
static int bnx2i_alloc_bdt(struct bnx2i_hba *hba, struct iscsi_session *session,
                           struct bnx2i_cmd *cmd)
{
        struct io_bdt *io = &cmd->io_tbl;
        struct iscsi_bd *bd;

        io->bd_tbl = dma_alloc_coherent(&hba->pcidev->dev,
                                        ISCSI_MAX_BDS_PER_CMD * sizeof(*bd),
                                        &io->bd_tbl_dma, GFP_KERNEL);
        if (!io->bd_tbl) {
                iscsi_session_printk(KERN_ERR, session, "Could not "
                                     "allocate bdt.\n");
                return -ENOMEM;
        }
        io->bd_valid = 0;
        return 0;
}

/**
 * bnx2i_destroy_cmd_pool - destroys iscsi command pool and release BD table
 * @hba:        adapter instance pointer
 * @session:    iscsi session pointer
 */
static void bnx2i_destroy_cmd_pool(struct bnx2i_hba *hba,
                                   struct iscsi_session *session)
{
        int i;

        for (i = 0; i < session->cmds_max; i++) {
                struct iscsi_task *task = session->cmds[i];
                struct bnx2i_cmd *cmd = task->dd_data;

                if (cmd->io_tbl.bd_tbl)
                        dma_free_coherent(&hba->pcidev->dev,
                                          ISCSI_MAX_BDS_PER_CMD *
                                          sizeof(struct iscsi_bd),
                                          cmd->io_tbl.bd_tbl,
                                          cmd->io_tbl.bd_tbl_dma);
        }

}


/**
 * bnx2i_setup_cmd_pool - sets up iscsi command pool for the session
 * @hba:        adapter instance pointer
 * @session:    iscsi session pointer
 */
static int bnx2i_setup_cmd_pool(struct bnx2i_hba *hba,
                                struct iscsi_session *session)
{
        int i;

        for (i = 0; i < session->cmds_max; i++) {
                struct iscsi_task *task = session->cmds[i];
                struct bnx2i_cmd *cmd = task->dd_data;

                task->hdr = &cmd->hdr;
                task->hdr_max = sizeof(struct iscsi_hdr);

                if (bnx2i_alloc_bdt(hba, session, cmd))
                        goto free_bdts;
        }

        return 0;

free_bdts:
        bnx2i_destroy_cmd_pool(hba, session);
        return -ENOMEM;
}


/**
 * bnx2i_setup_mp_bdt - allocate BD table resources
 * @hba:        pointer to adapter structure
 *
 * Allocate memory for dummy buffer and associated BD
 * table to be used by middle path (MP) requests
 */
static int bnx2i_setup_mp_bdt(struct bnx2i_hba *hba)
{
        int rc = 0;
        struct iscsi_bd *mp_bdt;
        u64 addr;

        hba->mp_bd_tbl = dma_alloc_coherent(&hba->pcidev->dev, CNIC_PAGE_SIZE,
                                            &hba->mp_bd_dma, GFP_KERNEL);
        if (!hba->mp_bd_tbl) {
                printk(KERN_ERR "unable to allocate Middle Path BDT\n");
                rc = -1;
                goto out;
        }

        hba->dummy_buffer = dma_alloc_coherent(&hba->pcidev->dev,
                                               CNIC_PAGE_SIZE,
                                               &hba->dummy_buf_dma, GFP_KERNEL);
        if (!hba->dummy_buffer) {
                printk(KERN_ERR "unable to alloc Middle Path Dummy Buffer\n");
                dma_free_coherent(&hba->pcidev->dev, CNIC_PAGE_SIZE,
                                  hba->mp_bd_tbl, hba->mp_bd_dma);
                hba->mp_bd_tbl = NULL;
                rc = -1;
                goto out;
        }

        mp_bdt = (struct iscsi_bd *) hba->mp_bd_tbl;
        addr = (unsigned long) hba->dummy_buf_dma;
        mp_bdt->buffer_addr_lo = addr & 0xffffffff;
        mp_bdt->buffer_addr_hi = addr >> 32;
        mp_bdt->buffer_length = CNIC_PAGE_SIZE;
        mp_bdt->flags = ISCSI_BD_LAST_IN_BD_CHAIN |
                        ISCSI_BD_FIRST_IN_BD_CHAIN;
out:
        return rc;
}


/**
 * bnx2i_free_mp_bdt - releases ITT back to free pool
 * @hba:        pointer to adapter instance
 *
 * free MP dummy buffer and associated BD table
 */
static void bnx2i_free_mp_bdt(struct bnx2i_hba *hba)
{
        if (hba->mp_bd_tbl) {
                dma_free_coherent(&hba->pcidev->dev, CNIC_PAGE_SIZE,
                                  hba->mp_bd_tbl, hba->mp_bd_dma);
                hba->mp_bd_tbl = NULL;
        }
        if (hba->dummy_buffer) {
                dma_free_coherent(&hba->pcidev->dev, CNIC_PAGE_SIZE,
                                  hba->dummy_buffer, hba->dummy_buf_dma);
                hba->dummy_buffer = NULL;
        }
        return;
}

/**
 * bnx2i_drop_session - notifies iscsid of connection error.
 * @cls_session:        iscsi cls session pointer
 *
 * This notifies iscsid that there is a error, so it can initiate
 * recovery.
 *
 * This relies on caller using the iscsi class iterator so the object
 * is refcounted and does not disapper from under us.
 */
void bnx2i_drop_session(struct iscsi_cls_session *cls_session)
{
        iscsi_session_failure(cls_session->dd_data, ISCSI_ERR_CONN_FAILED);
}

/**
 * bnx2i_ep_destroy_list_add - add an entry to EP destroy list
 * @hba:        pointer to adapter instance
 * @ep:         pointer to endpoint (transport identifier) structure
 *
 * EP destroy queue manager
 */
static int bnx2i_ep_destroy_list_add(struct bnx2i_hba *hba,
                                     struct bnx2i_endpoint *ep)
{
        write_lock_bh(&hba->ep_rdwr_lock);
        list_add_tail(&ep->link, &hba->ep_destroy_list);
        write_unlock_bh(&hba->ep_rdwr_lock);
        return 0;
}

/**
 * bnx2i_ep_destroy_list_del - add an entry to EP destroy list
 *
 * @hba:                pointer to adapter instance
 * @ep:                 pointer to endpoint (transport identifier) structure
 *
 * EP destroy queue manager
 */
static int bnx2i_ep_destroy_list_del(struct bnx2i_hba *hba,
                                     struct bnx2i_endpoint *ep)
{
        write_lock_bh(&hba->ep_rdwr_lock);
        list_del_init(&ep->link);
        write_unlock_bh(&hba->ep_rdwr_lock);

        return 0;
}

/**
 * bnx2i_ep_ofld_list_add - add an entry to ep offload pending list
 * @hba:        pointer to adapter instance
 * @ep:         pointer to endpoint (transport identifier) structure
 *
 * pending conn offload completion queue manager
 */
static int bnx2i_ep_ofld_list_add(struct bnx2i_hba *hba,
                                  struct bnx2i_endpoint *ep)
{
        write_lock_bh(&hba->ep_rdwr_lock);
        list_add_tail(&ep->link, &hba->ep_ofld_list);
        write_unlock_bh(&hba->ep_rdwr_lock);
        return 0;
}

/**
 * bnx2i_ep_ofld_list_del - add an entry to ep offload pending list
 * @hba:                pointer to adapter instance
 * @ep:                 pointer to endpoint (transport identifier) structure
 *
 * pending conn offload completion queue manager
 */
static int bnx2i_ep_ofld_list_del(struct bnx2i_hba *hba,
                                  struct bnx2i_endpoint *ep)
{
        write_lock_bh(&hba->ep_rdwr_lock);
        list_del_init(&ep->link);
        write_unlock_bh(&hba->ep_rdwr_lock);
        return 0;
}


/**
 * bnx2i_find_ep_in_ofld_list - find iscsi_cid in pending list of endpoints
 *
 * @hba:                pointer to adapter instance
 * @iscsi_cid:          iscsi context ID to find
 *
 */
struct bnx2i_endpoint *
bnx2i_find_ep_in_ofld_list(struct bnx2i_hba *hba, u32 iscsi_cid)
{
        struct list_head *list;
        struct list_head *tmp;
        struct bnx2i_endpoint *ep = NULL;

        read_lock_bh(&hba->ep_rdwr_lock);
        list_for_each_safe(list, tmp, &hba->ep_ofld_list) {
                ep = (struct bnx2i_endpoint *)list;

                if (ep->ep_iscsi_cid == iscsi_cid)
                        break;
                ep = NULL;
        }
        read_unlock_bh(&hba->ep_rdwr_lock);

        if (!ep)
                printk(KERN_ERR "l5 cid %d not found\n", iscsi_cid);
        return ep;
}

/**
 * bnx2i_find_ep_in_destroy_list - find iscsi_cid in destroy list
 * @hba:                pointer to adapter instance
 * @iscsi_cid:          iscsi context ID to find
 *
 */
struct bnx2i_endpoint *
bnx2i_find_ep_in_destroy_list(struct bnx2i_hba *hba, u32 iscsi_cid)
{
        struct list_head *list;
        struct list_head *tmp;
        struct bnx2i_endpoint *ep = NULL;

        read_lock_bh(&hba->ep_rdwr_lock);
        list_for_each_safe(list, tmp, &hba->ep_destroy_list) {
                ep = (struct bnx2i_endpoint *)list;

                if (ep->ep_iscsi_cid == iscsi_cid)
                        break;
                ep = NULL;
        }
        read_unlock_bh(&hba->ep_rdwr_lock);

        if (!ep)
                printk(KERN_ERR "l5 cid %d not found\n", iscsi_cid);

        return ep;
}

/**
 * bnx2i_ep_active_list_add - add an entry to ep active list
 * @hba:        pointer to adapter instance
 * @ep:         pointer to endpoint (transport identifier) structure
 *
 * current active conn queue manager
 */
static void bnx2i_ep_active_list_add(struct bnx2i_hba *hba,
                                     struct bnx2i_endpoint *ep)
{
        write_lock_bh(&hba->ep_rdwr_lock);
        list_add_tail(&ep->link, &hba->ep_active_list);
        write_unlock_bh(&hba->ep_rdwr_lock);
}


/**
 * bnx2i_ep_active_list_del - deletes an entry to ep active list
 * @hba:        pointer to adapter instance
 * @ep:         pointer to endpoint (transport identifier) structure
 *
 * current active conn queue manager
 */
static void bnx2i_ep_active_list_del(struct bnx2i_hba *hba,
                                     struct bnx2i_endpoint *ep)
{
        write_lock_bh(&hba->ep_rdwr_lock);
        list_del_init(&ep->link);
        write_unlock_bh(&hba->ep_rdwr_lock);
}


/**
 * bnx2i_setup_host_queue_size - assigns shost->can_queue param
 * @hba:        pointer to adapter instance
 * @shost:      scsi host pointer
 *
 * Initializes 'can_queue' parameter based on how many outstanding commands
 *      the device can handle. Each device 5708/5709/57710 has different
 *      capabilities
 */
static void bnx2i_setup_host_queue_size(struct bnx2i_hba *hba,
                                        struct Scsi_Host *shost)
{
        if (test_bit(BNX2I_NX2_DEV_5708, &hba->cnic_dev_type))
                shost->can_queue = ISCSI_MAX_CMDS_PER_HBA_5708;
        else if (test_bit(BNX2I_NX2_DEV_5709, &hba->cnic_dev_type))
                shost->can_queue = ISCSI_MAX_CMDS_PER_HBA_5709;
        else if (test_bit(BNX2I_NX2_DEV_57710, &hba->cnic_dev_type))
                shost->can_queue = ISCSI_MAX_CMDS_PER_HBA_57710;
        else
                shost->can_queue = ISCSI_MAX_CMDS_PER_HBA_5708;
}


/**
 * bnx2i_alloc_hba - allocate and init adapter instance
 * @cnic:       cnic device pointer
 *
 * allocate & initialize adapter structure and call other
 *      support routines to do per adapter initialization
 */
struct bnx2i_hba *bnx2i_alloc_hba(struct cnic_dev *cnic)
{
        struct Scsi_Host *shost;
        struct bnx2i_hba *hba;

        shost = iscsi_host_alloc(&bnx2i_host_template, sizeof(*hba), 0);
        if (!shost)
                return NULL;
        shost->dma_boundary = cnic->pcidev->dma_mask;
        shost->transportt = bnx2i_scsi_xport_template;
        shost->max_id = ISCSI_MAX_CONNS_PER_HBA - 1;
        shost->max_channel = 0;
        shost->max_lun = 512;
        shost->max_cmd_len = 16;

        hba = iscsi_host_priv(shost);
        hba->shost = shost;
        hba->netdev = cnic->netdev;
        /* Get PCI related information and update hba struct members */
        hba->pcidev = cnic->pcidev;
        pci_dev_get(hba->pcidev);
        hba->pci_did = hba->pcidev->device;
        hba->pci_vid = hba->pcidev->vendor;
        hba->pci_sdid = hba->pcidev->subsystem_device;
        hba->pci_svid = hba->pcidev->subsystem_vendor;
        hba->pci_func = PCI_FUNC(hba->pcidev->devfn);
        hba->pci_devno = PCI_SLOT(hba->pcidev->devfn);

        bnx2i_identify_device(hba, cnic);
        bnx2i_setup_host_queue_size(hba, shost);

        hba->reg_base = pci_resource_start(hba->pcidev, 0);
        if (test_bit(BNX2I_NX2_DEV_5709, &hba->cnic_dev_type)) {
                hba->regview = pci_iomap(hba->pcidev, 0, BNX2_MQ_CONFIG2);
                if (!hba->regview)
                        goto ioreg_map_err;
        } else if (test_bit(BNX2I_NX2_DEV_57710, &hba->cnic_dev_type)) {
                hba->regview = pci_iomap(hba->pcidev, 0, 4096);
                if (!hba->regview)
                        goto ioreg_map_err;
        }

        if (bnx2i_setup_mp_bdt(hba))
                goto mp_bdt_mem_err;

        INIT_LIST_HEAD(&hba->ep_ofld_list);
        INIT_LIST_HEAD(&hba->ep_active_list);
        INIT_LIST_HEAD(&hba->ep_destroy_list);
        rwlock_init(&hba->ep_rdwr_lock);

        hba->mtu_supported = BNX2I_MAX_MTU_SUPPORTED;

        /* different values for 5708/5709/57710 */
        hba->max_active_conns = ISCSI_MAX_CONNS_PER_HBA;

        if (bnx2i_setup_free_cid_que(hba))
                goto cid_que_err;

        /* SQ/RQ/CQ size can be changed via sysfx interface */
        if (test_bit(BNX2I_NX2_DEV_57710, &hba->cnic_dev_type)) {
                if (sq_size && sq_size <= BNX2I_5770X_SQ_WQES_MAX)
                        hba->max_sqes = sq_size;
                else
                        hba->max_sqes = BNX2I_5770X_SQ_WQES_DEFAULT;
        } else {        /* 5706/5708/5709 */
                if (sq_size && sq_size <= BNX2I_570X_SQ_WQES_MAX)
                        hba->max_sqes = sq_size;
                else
                        hba->max_sqes = BNX2I_570X_SQ_WQES_DEFAULT;
        }

        hba->max_rqes = rq_size;
        hba->max_cqes = hba->max_sqes + rq_size;
        if (test_bit(BNX2I_NX2_DEV_57710, &hba->cnic_dev_type)) {
                if (hba->max_cqes > BNX2I_5770X_CQ_WQES_MAX)
                        hba->max_cqes = BNX2I_5770X_CQ_WQES_MAX;
        } else if (hba->max_cqes > BNX2I_570X_CQ_WQES_MAX)
                hba->max_cqes = BNX2I_570X_CQ_WQES_MAX;

        hba->num_ccell = hba->max_sqes / 2;

        spin_lock_init(&hba->lock);
        mutex_init(&hba->net_dev_lock);
        init_waitqueue_head(&hba->eh_wait);
        if (test_bit(BNX2I_NX2_DEV_57710, &hba->cnic_dev_type)) {
                hba->hba_shutdown_tmo = 30 * HZ;
                hba->conn_teardown_tmo = 20 * HZ;
                hba->conn_ctx_destroy_tmo = 6 * HZ;
        } else {        /* 5706/5708/5709 */
                hba->hba_shutdown_tmo = 20 * HZ;
                hba->conn_teardown_tmo = 10 * HZ;
                hba->conn_ctx_destroy_tmo = 2 * HZ;
        }

#ifdef CONFIG_32BIT
        spin_lock_init(&hba->stat_lock);
#endif
        memset(&hba->stats, 0, sizeof(struct iscsi_stats_info));

        if (iscsi_host_add(shost, &hba->pcidev->dev))
                goto free_dump_mem;
        return hba;

free_dump_mem:
        bnx2i_release_free_cid_que(hba);
cid_que_err:
        bnx2i_free_mp_bdt(hba);
mp_bdt_mem_err:
        if (hba->regview) {
                pci_iounmap(hba->pcidev, hba->regview);
                hba->regview = NULL;
        }
ioreg_map_err:
        pci_dev_put(hba->pcidev);
        scsi_host_put(shost);
        return NULL;
}

/**
 * bnx2i_free_hba- releases hba structure and resources held by the adapter
 * @hba:        pointer to adapter instance
 *
 * free adapter structure and call various cleanup routines.
 */
void bnx2i_free_hba(struct bnx2i_hba *hba)
{
        struct Scsi_Host *shost = hba->shost;

        iscsi_host_remove(shost, false);
        INIT_LIST_HEAD(&hba->ep_ofld_list);
        INIT_LIST_HEAD(&hba->ep_active_list);
        INIT_LIST_HEAD(&hba->ep_destroy_list);

        if (hba->regview) {
                pci_iounmap(hba->pcidev, hba->regview);
                hba->regview = NULL;
        }
        pci_dev_put(hba->pcidev);
        bnx2i_free_mp_bdt(hba);
        bnx2i_release_free_cid_que(hba);
        iscsi_host_free(shost);
}

/**
 * bnx2i_conn_free_login_resources - free DMA resources used for login process
 * @hba:                pointer to adapter instance
 * @bnx2i_conn:         iscsi connection pointer
 *
 * Login related resources, mostly BDT & payload DMA memory is freed
 */
static void bnx2i_conn_free_login_resources(struct bnx2i_hba *hba,
                                            struct bnx2i_conn *bnx2i_conn)
{
        if (bnx2i_conn->gen_pdu.resp_bd_tbl) {
                dma_free_coherent(&hba->pcidev->dev, CNIC_PAGE_SIZE,
                                  bnx2i_conn->gen_pdu.resp_bd_tbl,
                                  bnx2i_conn->gen_pdu.resp_bd_dma);
                bnx2i_conn->gen_pdu.resp_bd_tbl = NULL;
        }

        if (bnx2i_conn->gen_pdu.req_bd_tbl) {
                dma_free_coherent(&hba->pcidev->dev, CNIC_PAGE_SIZE,
                                  bnx2i_conn->gen_pdu.req_bd_tbl,
                                  bnx2i_conn->gen_pdu.req_bd_dma);
                bnx2i_conn->gen_pdu.req_bd_tbl = NULL;
        }

        if (bnx2i_conn->gen_pdu.resp_buf) {
                dma_free_coherent(&hba->pcidev->dev,
                                  ISCSI_DEF_MAX_RECV_SEG_LEN,
                                  bnx2i_conn->gen_pdu.resp_buf,
                                  bnx2i_conn->gen_pdu.resp_dma_addr);
                bnx2i_conn->gen_pdu.resp_buf = NULL;
        }

        if (bnx2i_conn->gen_pdu.req_buf) {
                dma_free_coherent(&hba->pcidev->dev,
                                  ISCSI_DEF_MAX_RECV_SEG_LEN,
                                  bnx2i_conn->gen_pdu.req_buf,
                                  bnx2i_conn->gen_pdu.req_dma_addr);
                bnx2i_conn->gen_pdu.req_buf = NULL;
        }
}

/**
 * bnx2i_conn_alloc_login_resources - alloc DMA resources for login/nop.
 * @hba:                pointer to adapter instance
 * @bnx2i_conn:         iscsi connection pointer
 *
 * Mgmt task DNA resources are allocated in this routine.
 */
static int bnx2i_conn_alloc_login_resources(struct bnx2i_hba *hba,
                                            struct bnx2i_conn *bnx2i_conn)
{
        /* Allocate memory for login request/response buffers */
        bnx2i_conn->gen_pdu.req_buf =
                dma_alloc_coherent(&hba->pcidev->dev,
                                   ISCSI_DEF_MAX_RECV_SEG_LEN,
                                   &bnx2i_conn->gen_pdu.req_dma_addr,
                                   GFP_KERNEL);
        if (bnx2i_conn->gen_pdu.req_buf == NULL)
                goto login_req_buf_failure;

        bnx2i_conn->gen_pdu.req_buf_size = 0;
        bnx2i_conn->gen_pdu.req_wr_ptr = bnx2i_conn->gen_pdu.req_buf;

        bnx2i_conn->gen_pdu.resp_buf =
                dma_alloc_coherent(&hba->pcidev->dev,
                                   ISCSI_DEF_MAX_RECV_SEG_LEN,
                                   &bnx2i_conn->gen_pdu.resp_dma_addr,
                                   GFP_KERNEL);
        if (bnx2i_conn->gen_pdu.resp_buf == NULL)
                goto login_resp_buf_failure;

        bnx2i_conn->gen_pdu.resp_buf_size = ISCSI_DEF_MAX_RECV_SEG_LEN;
        bnx2i_conn->gen_pdu.resp_wr_ptr = bnx2i_conn->gen_pdu.resp_buf;

        bnx2i_conn->gen_pdu.req_bd_tbl =
                dma_alloc_coherent(&hba->pcidev->dev, CNIC_PAGE_SIZE,
                                   &bnx2i_conn->gen_pdu.req_bd_dma, GFP_KERNEL);
        if (bnx2i_conn->gen_pdu.req_bd_tbl == NULL)
                goto login_req_bd_tbl_failure;

        bnx2i_conn->gen_pdu.resp_bd_tbl =
                dma_alloc_coherent(&hba->pcidev->dev, CNIC_PAGE_SIZE,
                                   &bnx2i_conn->gen_pdu.resp_bd_dma,
                                   GFP_KERNEL);
        if (bnx2i_conn->gen_pdu.resp_bd_tbl == NULL)
                goto login_resp_bd_tbl_failure;

        return 0;

login_resp_bd_tbl_failure:
        dma_free_coherent(&hba->pcidev->dev, CNIC_PAGE_SIZE,
                          bnx2i_conn->gen_pdu.req_bd_tbl,
                          bnx2i_conn->gen_pdu.req_bd_dma);
        bnx2i_conn->gen_pdu.req_bd_tbl = NULL;

login_req_bd_tbl_failure:
        dma_free_coherent(&hba->pcidev->dev, ISCSI_DEF_MAX_RECV_SEG_LEN,
                          bnx2i_conn->gen_pdu.resp_buf,
                          bnx2i_conn->gen_pdu.resp_dma_addr);
        bnx2i_conn->gen_pdu.resp_buf = NULL;
login_resp_buf_failure:
        dma_free_coherent(&hba->pcidev->dev, ISCSI_DEF_MAX_RECV_SEG_LEN,
                          bnx2i_conn->gen_pdu.req_buf,
                          bnx2i_conn->gen_pdu.req_dma_addr);
        bnx2i_conn->gen_pdu.req_buf = NULL;
login_req_buf_failure:
        iscsi_conn_printk(KERN_ERR, bnx2i_conn->cls_conn->dd_data,
                          "login resource alloc failed!!\n");
        return -ENOMEM;

}


/**
 * bnx2i_iscsi_prep_generic_pdu_bd - prepares BD table.
 * @bnx2i_conn:         iscsi connection pointer
 *
 * Allocates buffers and BD tables before shipping requests to cnic
 *      for PDUs prepared by 'iscsid' daemon
 */
static void bnx2i_iscsi_prep_generic_pdu_bd(struct bnx2i_conn *bnx2i_conn)
{
        struct iscsi_bd *bd_tbl;

        bd_tbl = (struct iscsi_bd *) bnx2i_conn->gen_pdu.req_bd_tbl;

        bd_tbl->buffer_addr_hi =
                (u32) ((u64) bnx2i_conn->gen_pdu.req_dma_addr >> 32);
        bd_tbl->buffer_addr_lo = (u32) bnx2i_conn->gen_pdu.req_dma_addr;
        bd_tbl->buffer_length = bnx2i_conn->gen_pdu.req_wr_ptr -
                                bnx2i_conn->gen_pdu.req_buf;
        bd_tbl->reserved0 = 0;
        bd_tbl->flags = ISCSI_BD_LAST_IN_BD_CHAIN |
                        ISCSI_BD_FIRST_IN_BD_CHAIN;

        bd_tbl = (struct iscsi_bd  *) bnx2i_conn->gen_pdu.resp_bd_tbl;
        bd_tbl->buffer_addr_hi = (u64) bnx2i_conn->gen_pdu.resp_dma_addr >> 32;
        bd_tbl->buffer_addr_lo = (u32) bnx2i_conn->gen_pdu.resp_dma_addr;
        bd_tbl->buffer_length = ISCSI_DEF_MAX_RECV_SEG_LEN;
        bd_tbl->reserved0 = 0;
        bd_tbl->flags = ISCSI_BD_LAST_IN_BD_CHAIN |
                        ISCSI_BD_FIRST_IN_BD_CHAIN;
}


/**
 * bnx2i_iscsi_send_generic_request - called to send mgmt tasks.
 * @task:       transport layer task pointer
 *
 * called to transmit PDUs prepared by the 'iscsid' daemon. iSCSI login,
 *      Nop-out and Logout requests flow through this path.
 */
static int bnx2i_iscsi_send_generic_request(struct iscsi_task *task)
{
        struct bnx2i_cmd *cmd = task->dd_data;
        struct bnx2i_conn *bnx2i_conn = cmd->conn;
        int rc = 0;
        char *buf;
        int data_len;

        bnx2i_iscsi_prep_generic_pdu_bd(bnx2i_conn);
        switch (task->hdr->opcode & ISCSI_OPCODE_MASK) {
        case ISCSI_OP_LOGIN:
                bnx2i_send_iscsi_login(bnx2i_conn, task);
                break;
        case ISCSI_OP_NOOP_OUT:
                data_len = bnx2i_conn->gen_pdu.req_buf_size;
                buf = bnx2i_conn->gen_pdu.req_buf;
                if (data_len)
                        rc = bnx2i_send_iscsi_nopout(bnx2i_conn, task,
                                                     buf, data_len, 1);
                else
                        rc = bnx2i_send_iscsi_nopout(bnx2i_conn, task,
                                                     NULL, 0, 1);
                break;
        case ISCSI_OP_LOGOUT:
                rc = bnx2i_send_iscsi_logout(bnx2i_conn, task);
                break;
        case ISCSI_OP_SCSI_TMFUNC:
                rc = bnx2i_send_iscsi_tmf(bnx2i_conn, task);
                break;
        case ISCSI_OP_TEXT:
                rc = bnx2i_send_iscsi_text(bnx2i_conn, task);
                break;
        default:
                iscsi_conn_printk(KERN_ALERT, bnx2i_conn->cls_conn->dd_data,
                                  "send_gen: unsupported op 0x%x\n",
                                  task->hdr->opcode);
        }
        return rc;
}


/**********************************************************************
 *              SCSI-ML Interface
 **********************************************************************/

/**
 * bnx2i_cpy_scsi_cdb - copies LUN & CDB fields in required format to sq wqe
 * @sc:         SCSI-ML command pointer
 * @cmd:        iscsi cmd pointer
 */
static void bnx2i_cpy_scsi_cdb(struct scsi_cmnd *sc, struct bnx2i_cmd *cmd)
{
        u32 dword;
        int lpcnt;
        u8 *srcp;
        u32 *dstp;
        u32 scsi_lun[2];

        int_to_scsilun(sc->device->lun, (struct scsi_lun *) scsi_lun);
        cmd->req.lun[0] = be32_to_cpu(scsi_lun[0]);
        cmd->req.lun[1] = be32_to_cpu(scsi_lun[1]);

        lpcnt = cmd->scsi_cmd->cmd_len / sizeof(dword);
        srcp = (u8 *) sc->cmnd;
        dstp = (u32 *) cmd->req.cdb;
        while (lpcnt--) {
                memcpy(&dword, (const void *) srcp, 4);
                *dstp = cpu_to_be32(dword);
                srcp += 4;
                dstp++;
        }
        if (sc->cmd_len & 0x3) {
                dword = (u32) srcp[0] | ((u32) srcp[1] << 8);
                *dstp = cpu_to_be32(dword);
        }
}

static void bnx2i_cleanup_task(struct iscsi_task *task)
{
        struct iscsi_conn *conn = task->conn;
        struct bnx2i_conn *bnx2i_conn = conn->dd_data;
        struct bnx2i_hba *hba = bnx2i_conn->hba;

        /*
         * mgmt task or cmd was never sent to us to transmit.
         */
        if (!task->sc || task->state == ISCSI_TASK_PENDING)
                return;
        /*
         * need to clean-up task context to claim dma buffers
         */
        if (task->state == ISCSI_TASK_ABRT_TMF) {
                bnx2i_send_cmd_cleanup_req(hba, task->dd_data);

                spin_unlock_bh(&conn->session->back_lock);
                wait_for_completion_timeout(&bnx2i_conn->cmd_cleanup_cmpl,
                                msecs_to_jiffies(ISCSI_CMD_CLEANUP_TIMEOUT));
                spin_lock_bh(&conn->session->back_lock);
        }
        bnx2i_iscsi_unmap_sg_list(task->dd_data);
}

/**
 * bnx2i_mtask_xmit - transmit mtask to chip for further processing
 * @conn:       transport layer conn structure pointer
 * @task:       transport layer command structure pointer
 */
static int
bnx2i_mtask_xmit(struct iscsi_conn *conn, struct iscsi_task *task)
{
        struct bnx2i_conn *bnx2i_conn = conn->dd_data;
        struct bnx2i_hba *hba = bnx2i_conn->hba;
        struct bnx2i_cmd *cmd = task->dd_data;

        memset(bnx2i_conn->gen_pdu.req_buf, 0, ISCSI_DEF_MAX_RECV_SEG_LEN);

        bnx2i_setup_cmd_wqe_template(cmd);
        bnx2i_conn->gen_pdu.req_buf_size = task->data_count;

        /* Tx PDU/data length count */
        ADD_STATS_64(hba, tx_pdus, 1);
        ADD_STATS_64(hba, tx_bytes, task->data_count);

        if (task->data_count) {
                memcpy(bnx2i_conn->gen_pdu.req_buf, task->data,
                       task->data_count);
                bnx2i_conn->gen_pdu.req_wr_ptr =
                        bnx2i_conn->gen_pdu.req_buf + task->data_count;
        }
        cmd->conn = conn->dd_data;
        cmd->scsi_cmd = NULL;
        return bnx2i_iscsi_send_generic_request(task);
}

/**
 * bnx2i_task_xmit - transmit iscsi command to chip for further processing
 * @task:       transport layer command structure pointer
 *
 * maps SG buffers and send request to chip/firmware in the form of SQ WQE
 */
static int bnx2i_task_xmit(struct iscsi_task *task)
{
        struct iscsi_conn *conn = task->conn;
        struct iscsi_session *session = conn->session;
        struct Scsi_Host *shost = iscsi_session_to_shost(session->cls_session);
        struct bnx2i_hba *hba = iscsi_host_priv(shost);
        struct bnx2i_conn *bnx2i_conn = conn->dd_data;
        struct scsi_cmnd *sc = task->sc;
        struct bnx2i_cmd *cmd = task->dd_data;
        struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)task->hdr;

        if (atomic_read(&bnx2i_conn->ep->num_active_cmds) + 1  >
            hba->max_sqes)
                return -ENOMEM;

        /*
         * If there is no scsi_cmnd this must be a mgmt task
         */
        if (!sc)
                return bnx2i_mtask_xmit(conn, task);

        bnx2i_setup_cmd_wqe_template(cmd);
        cmd->req.op_code = ISCSI_OP_SCSI_CMD;
        cmd->conn = bnx2i_conn;
        cmd->scsi_cmd = sc;
        cmd->req.total_data_transfer_length = scsi_bufflen(sc);
        cmd->req.cmd_sn = be32_to_cpu(hdr->cmdsn);

        bnx2i_iscsi_map_sg_list(cmd);
        bnx2i_cpy_scsi_cdb(sc, cmd);

        cmd->req.op_attr = ISCSI_ATTR_SIMPLE;
        if (sc->sc_data_direction == DMA_TO_DEVICE) {
                cmd->req.op_attr |= ISCSI_CMD_REQUEST_WRITE;
                cmd->req.itt = task->itt |
                        (ISCSI_TASK_TYPE_WRITE << ISCSI_CMD_REQUEST_TYPE_SHIFT);
                bnx2i_setup_write_cmd_bd_info(task);
        } else {
                if (scsi_bufflen(sc))
                        cmd->req.op_attr |= ISCSI_CMD_REQUEST_READ;
                cmd->req.itt = task->itt |
                        (ISCSI_TASK_TYPE_READ << ISCSI_CMD_REQUEST_TYPE_SHIFT);
        }

        cmd->req.num_bds = cmd->io_tbl.bd_valid;
        if (!cmd->io_tbl.bd_valid) {
                cmd->req.bd_list_addr_lo = (u32) hba->mp_bd_dma;
                cmd->req.bd_list_addr_hi = (u32) ((u64) hba->mp_bd_dma >> 32);
                cmd->req.num_bds = 1;
        }

        bnx2i_send_iscsi_scsicmd(bnx2i_conn, cmd);
        return 0;
}

/**
 * bnx2i_session_create - create a new iscsi session
 * @ep:         pointer to iscsi endpoint
 * @cmds_max:           user specified maximum commands
 * @qdepth:             scsi queue depth to support
 * @initial_cmdsn:      initial iscsi CMDSN to be used for this session
 *
 * Creates a new iSCSI session instance on given device.
 */
static struct iscsi_cls_session *
bnx2i_session_create(struct iscsi_endpoint *ep,
                     uint16_t cmds_max, uint16_t qdepth,
                     uint32_t initial_cmdsn)
{
        struct Scsi_Host *shost;
        struct iscsi_cls_session *cls_session;
        struct bnx2i_hba *hba;
        struct bnx2i_endpoint *bnx2i_ep;

        if (!ep) {
                printk(KERN_ERR "bnx2i: missing ep.\n");
                return NULL;
        }

        bnx2i_ep = ep->dd_data;
        shost = bnx2i_ep->hba->shost;
        hba = iscsi_host_priv(shost);
        if (bnx2i_adapter_ready(hba))
                return NULL;

        /*
         * user can override hw limit as long as it is within
         * the min/max.
         */
        if (cmds_max > hba->max_sqes)
                cmds_max = hba->max_sqes;
        else if (cmds_max < BNX2I_SQ_WQES_MIN)
                cmds_max = BNX2I_SQ_WQES_MIN;

        cls_session = iscsi_session_setup(&bnx2i_iscsi_transport, shost,
                                          cmds_max, 0, sizeof(struct bnx2i_cmd),
                                          initial_cmdsn, ISCSI_MAX_TARGET);
        if (!cls_session)
                return NULL;

        if (bnx2i_setup_cmd_pool(hba, cls_session->dd_data))
                goto session_teardown;
        return cls_session;

session_teardown:
        iscsi_session_teardown(cls_session);
        return NULL;
}


/**
 * bnx2i_session_destroy - destroys iscsi session
 * @cls_session:        pointer to iscsi cls session
 *
 * Destroys previously created iSCSI session instance and releases
 *      all resources held by it
 */
static void bnx2i_session_destroy(struct iscsi_cls_session *cls_session)
{
        struct iscsi_session *session = cls_session->dd_data;
        struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
        struct bnx2i_hba *hba = iscsi_host_priv(shost);

        bnx2i_destroy_cmd_pool(hba, session);
        iscsi_session_teardown(cls_session);
}


/**
 * bnx2i_conn_create - create iscsi connection instance
 * @cls_session:        pointer to iscsi cls session
 * @cid:                iscsi cid as per rfc (not NX2's CID terminology)
 *
 * Creates a new iSCSI connection instance for a given session
 */
static struct iscsi_cls_conn *
bnx2i_conn_create(struct iscsi_cls_session *cls_session, uint32_t cid)
{
        struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
        struct bnx2i_hba *hba = iscsi_host_priv(shost);
        struct bnx2i_conn *bnx2i_conn;
        struct iscsi_cls_conn *cls_conn;
        struct iscsi_conn *conn;

        cls_conn = iscsi_conn_setup(cls_session, sizeof(*bnx2i_conn),
                                    cid);
        if (!cls_conn)
                return NULL;
        conn = cls_conn->dd_data;

        bnx2i_conn = conn->dd_data;
        bnx2i_conn->cls_conn = cls_conn;
        bnx2i_conn->hba = hba;

        atomic_set(&bnx2i_conn->work_cnt, 0);

        /* 'ep' ptr will be assigned in bind() call */
        bnx2i_conn->ep = NULL;
        init_completion(&bnx2i_conn->cmd_cleanup_cmpl);

        if (bnx2i_conn_alloc_login_resources(hba, bnx2i_conn)) {
                iscsi_conn_printk(KERN_ALERT, conn,
                                  "conn_new: login resc alloc failed!!\n");
                goto free_conn;
        }

        return cls_conn;

free_conn:
        iscsi_conn_teardown(cls_conn);
        return NULL;
}

/**
 * bnx2i_conn_bind - binds iscsi sess, conn and ep objects together
 * @cls_session:        pointer to iscsi cls session
 * @cls_conn:           pointer to iscsi cls conn
 * @transport_fd:       64-bit EP handle
 * @is_leading:         leading connection on this session?
 *
 * Binds together iSCSI session instance, iSCSI connection instance
 *      and the TCP connection. This routine returns error code if
 *      TCP connection does not belong on the device iSCSI sess/conn
 *      is bound
 */
static int bnx2i_conn_bind(struct iscsi_cls_session *cls_session,
                           struct iscsi_cls_conn *cls_conn,
                           uint64_t transport_fd, int is_leading)
{
        struct iscsi_conn *conn = cls_conn->dd_data;
        struct bnx2i_conn *bnx2i_conn = conn->dd_data;
        struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
        struct bnx2i_hba *hba = iscsi_host_priv(shost);
        struct bnx2i_endpoint *bnx2i_ep;
        struct iscsi_endpoint *ep;
        int ret_code;

        ep = iscsi_lookup_endpoint(transport_fd);
        if (!ep)
                return -EINVAL;
        /*
         * Forcefully terminate all in progress connection recovery at the
         * earliest, either in bind(), send_pdu(LOGIN), or conn_start()
         */
        if (bnx2i_adapter_ready(hba)) {
                ret_code = -EIO;
                goto put_ep;
        }

        bnx2i_ep = ep->dd_data;
        if ((bnx2i_ep->state == EP_STATE_TCP_FIN_RCVD) ||
            (bnx2i_ep->state == EP_STATE_TCP_RST_RCVD)) {
                /* Peer disconnect via' FIN or RST */
                ret_code = -EINVAL;
                goto put_ep;
        }

        if (iscsi_conn_bind(cls_session, cls_conn, is_leading)) {
                ret_code = -EINVAL;
                goto put_ep;
        }

        if (bnx2i_ep->hba != hba) {
                /* Error - TCP connection does not belong to this device
                 */
                iscsi_conn_printk(KERN_ALERT, cls_conn->dd_data,
                                  "conn bind, ep=0x%p (%s) does not",
                                  bnx2i_ep, bnx2i_ep->hba->netdev->name);
                iscsi_conn_printk(KERN_ALERT, cls_conn->dd_data,
                                  "belong to hba (%s)\n",
                                  hba->netdev->name);
                ret_code = -EEXIST;
                goto put_ep;
        }
        bnx2i_ep->conn = bnx2i_conn;
        bnx2i_conn->ep = bnx2i_ep;
        bnx2i_conn->iscsi_conn_cid = bnx2i_ep->ep_iscsi_cid;
        bnx2i_conn->fw_cid = bnx2i_ep->ep_cid;

        ret_code = bnx2i_bind_conn_to_iscsi_cid(hba, bnx2i_conn,
                                                bnx2i_ep->ep_iscsi_cid);

        /* 5706/5708/5709 FW takes RQ as full when initiated, but for 57710
         * driver needs to explicitly replenish RQ index during setup.
         */
        if (test_bit(BNX2I_NX2_DEV_57710, &bnx2i_ep->hba->cnic_dev_type))
                bnx2i_put_rq_buf(bnx2i_conn, 0);

        bnx2i_arm_cq_event_coalescing(bnx2i_conn->ep, CNIC_ARM_CQE);
put_ep:
        iscsi_put_endpoint(ep);
        return ret_code;
}


/**
 * bnx2i_conn_destroy - destroy iscsi connection instance & release resources
 * @cls_conn:   pointer to iscsi cls conn
 *
 * Destroy an iSCSI connection instance and release memory resources held by
 *      this connection
 */
static void bnx2i_conn_destroy(struct iscsi_cls_conn *cls_conn)
{
        struct iscsi_conn *conn = cls_conn->dd_data;
        struct bnx2i_conn *bnx2i_conn = conn->dd_data;
        struct Scsi_Host *shost;
        struct bnx2i_hba *hba;
        struct bnx2i_work *work, *tmp;
        unsigned cpu = 0;
        struct bnx2i_percpu_s *p;

        shost = iscsi_session_to_shost(iscsi_conn_to_session(cls_conn));
        hba = iscsi_host_priv(shost);

        bnx2i_conn_free_login_resources(hba, bnx2i_conn);

        if (atomic_read(&bnx2i_conn->work_cnt)) {
                for_each_online_cpu(cpu) {
                        p = &per_cpu(bnx2i_percpu, cpu);
                        spin_lock_bh(&p->p_work_lock);
                        list_for_each_entry_safe(work, tmp,
                                                 &p->work_list, list) {
                                if (work->session == conn->session &&
                                    work->bnx2i_conn == bnx2i_conn) {
                                        list_del_init(&work->list);
                                        kfree(work);
                                        if (!atomic_dec_and_test(
                                                        &bnx2i_conn->work_cnt))
                                                break;
                                }
                        }
                        spin_unlock_bh(&p->p_work_lock);
                }
        }

        iscsi_conn_teardown(cls_conn);
}


/**
 * bnx2i_ep_get_param - return iscsi ep parameter to caller
 * @ep:         pointer to iscsi endpoint
 * @param:      parameter type identifier
 * @buf:        buffer pointer
 *
 * returns iSCSI ep parameters
 */
static int bnx2i_ep_get_param(struct iscsi_endpoint *ep,
                              enum iscsi_param param, char *buf)
{
        struct bnx2i_endpoint *bnx2i_ep = ep->dd_data;
        struct bnx2i_hba *hba = bnx2i_ep->hba;
        int len = -ENOTCONN;

        if (!hba)
                return -ENOTCONN;

        switch (param) {
        case ISCSI_PARAM_CONN_PORT:
                mutex_lock(&hba->net_dev_lock);
                if (bnx2i_ep->cm_sk)
                        len = sprintf(buf, "%hu\n", bnx2i_ep->cm_sk->dst_port);
                mutex_unlock(&hba->net_dev_lock);
                break;
        case ISCSI_PARAM_CONN_ADDRESS:
                mutex_lock(&hba->net_dev_lock);
                if (bnx2i_ep->cm_sk)
                        len = sprintf(buf, "%pI4\n", &bnx2i_ep->cm_sk->dst_ip);
                mutex_unlock(&hba->net_dev_lock);
                break;
        default:
                return -ENOSYS;
        }

        return len;
}

/**
 * bnx2i_host_get_param - returns host (adapter) related parameters
 * @shost:      scsi host pointer
 * @param:      parameter type identifier
 * @buf:        buffer pointer
 */
static int bnx2i_host_get_param(struct Scsi_Host *shost,
                                enum iscsi_host_param param, char *buf)
{
        struct bnx2i_hba *hba = iscsi_host_priv(shost);
        int len = 0;

        switch (param) {
        case ISCSI_HOST_PARAM_HWADDRESS:
                len = sysfs_format_mac(buf, hba->cnic->mac_addr, 6);
                break;
        case ISCSI_HOST_PARAM_NETDEV_NAME:
                len = sprintf(buf, "%s\n", hba->netdev->name);
                break;
        case ISCSI_HOST_PARAM_IPADDRESS: {
                struct list_head *active_list = &hba->ep_active_list;

                read_lock_bh(&hba->ep_rdwr_lock);
                if (!list_empty(&hba->ep_active_list)) {
                        struct bnx2i_endpoint *bnx2i_ep;
                        struct cnic_sock *csk;

                        bnx2i_ep = list_first_entry(active_list,
                                                    struct bnx2i_endpoint,
                                                    link);
                        csk = bnx2i_ep->cm_sk;
                        if (test_bit(SK_F_IPV6, &csk->flags))
                                len = sprintf(buf, "%pI6\n", csk->src_ip);
                        else
                                len = sprintf(buf, "%pI4\n", csk->src_ip);
                }
                read_unlock_bh(&hba->ep_rdwr_lock);
                break;
        }
        default:
                return iscsi_host_get_param(shost, param, buf);
        }
        return len;
}

/**
 * bnx2i_conn_start - completes iscsi connection migration to FFP
 * @cls_conn:   pointer to iscsi cls conn
 *
 * last call in FFP migration to handover iscsi conn to the driver
 */
static int bnx2i_conn_start(struct iscsi_cls_conn *cls_conn)
{
        struct iscsi_conn *conn = cls_conn->dd_data;
        struct bnx2i_conn *bnx2i_conn = conn->dd_data;

        bnx2i_conn->ep->state = EP_STATE_ULP_UPDATE_START;
        bnx2i_update_iscsi_conn(conn);

        /*
         * this should normally not sleep for a long time so it should
         * not disrupt the caller.
         */
        timer_setup(&bnx2i_conn->ep->ofld_timer, bnx2i_ep_ofld_timer, 0);
        bnx2i_conn->ep->ofld_timer.expires = 1 * HZ + jiffies;
        add_timer(&bnx2i_conn->ep->ofld_timer);
        /* update iSCSI context for this conn, wait for CNIC to complete */
        wait_event_interruptible(bnx2i_conn->ep->ofld_wait,
                        bnx2i_conn->ep->state != EP_STATE_ULP_UPDATE_START);

        if (signal_pending(current))
                flush_signals(current);
        timer_delete_sync(&bnx2i_conn->ep->ofld_timer);

        iscsi_conn_start(cls_conn);
        return 0;
}


/**
 * bnx2i_conn_get_stats - returns iSCSI stats
 * @cls_conn:   pointer to iscsi cls conn
 * @stats:      pointer to iscsi statistic struct
 */
static void bnx2i_conn_get_stats(struct iscsi_cls_conn *cls_conn,
                                 struct iscsi_stats *stats)
{
        struct iscsi_conn *conn = cls_conn->dd_data;

        stats->txdata_octets = conn->txdata_octets;
        stats->rxdata_octets = conn->rxdata_octets;
        stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
        stats->dataout_pdus = conn->dataout_pdus_cnt;
        stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
        stats->datain_pdus = conn->datain_pdus_cnt;
        stats->r2t_pdus = conn->r2t_pdus_cnt;
        stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
        stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
        stats->digest_err = 0;
        stats->timeout_err = 0;
        strcpy(stats->custom[0].desc, "eh_abort_cnt");
        stats->custom[0].value = conn->eh_abort_cnt;
        stats->custom_length = 1;
}


/**
 * bnx2i_check_route - checks if target IP route belongs to one of NX2 devices
 * @dst_addr:   target IP address
 *
 * check if route resolves to BNX2 device
 */
static struct bnx2i_hba *bnx2i_check_route(struct sockaddr *dst_addr)
{
        struct sockaddr_in *desti = (struct sockaddr_in *) dst_addr;
        struct bnx2i_hba *hba;
        struct cnic_dev *cnic = NULL;

        hba = get_adapter_list_head();
        if (hba && hba->cnic)
                cnic = hba->cnic->cm_select_dev(desti, CNIC_ULP_ISCSI);
        if (!cnic) {
                printk(KERN_ALERT "bnx2i: no route,"
                       "can't connect using cnic\n");
                goto no_nx2_route;
        }
        hba = bnx2i_find_hba_for_cnic(cnic);
        if (!hba)
                goto no_nx2_route;

        if (bnx2i_adapter_ready(hba)) {
                printk(KERN_ALERT "bnx2i: check route, hba not found\n");
                goto no_nx2_route;
        }
        if (hba->netdev->mtu > hba->mtu_supported) {
                printk(KERN_ALERT "bnx2i: %s network i/f mtu is set to %d\n",
                                  hba->netdev->name, hba->netdev->mtu);
                printk(KERN_ALERT "bnx2i: iSCSI HBA can support mtu of %d\n",
                                  hba->mtu_supported);
                goto no_nx2_route;
        }
        return hba;
no_nx2_route:
        return NULL;
}


/**
 * bnx2i_tear_down_conn - tear down iscsi/tcp connection and free resources
 * @hba:        pointer to adapter instance
 * @ep:         endpoint (transport identifier) structure
 *
 * destroys cm_sock structure and on chip iscsi context
 */
static int bnx2i_tear_down_conn(struct bnx2i_hba *hba,
                                 struct bnx2i_endpoint *ep)
{
        if (test_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic) && ep->cm_sk)
                hba->cnic->cm_destroy(ep->cm_sk);

        if (test_bit(BNX2I_NX2_DEV_57710, &hba->cnic_dev_type) &&
            ep->state == EP_STATE_DISCONN_TIMEDOUT) {
                if (ep->conn && ep->conn->cls_conn &&
                    ep->conn->cls_conn->dd_data) {
                        struct iscsi_conn *conn = ep->conn->cls_conn->dd_data;

                        /* Must suspend all rx queue activity for this ep */
                        set_bit(ISCSI_CONN_FLAG_SUSPEND_RX, &conn->flags);
                }
                /* CONN_DISCONNECT timeout may or may not be an issue depending
                 * on what transcribed in TCP layer, different targets behave
                 * differently
                 */
                printk(KERN_ALERT "bnx2i (%s): - WARN - CONN_DISCON timed out, "
                                  "please submit GRC Dump, NW/PCIe trace, "
                                  "driver msgs to developers for analysis\n",
                                  hba->netdev->name);
        }

        ep->state = EP_STATE_CLEANUP_START;
        timer_setup(&ep->ofld_timer, bnx2i_ep_ofld_timer, 0);
        ep->ofld_timer.expires = hba->conn_ctx_destroy_tmo + jiffies;
        add_timer(&ep->ofld_timer);

        bnx2i_ep_destroy_list_add(hba, ep);

        /* destroy iSCSI context, wait for it to complete */
        if (bnx2i_send_conn_destroy(hba, ep))
                ep->state = EP_STATE_CLEANUP_CMPL;

        wait_event_interruptible(ep->ofld_wait,
                                 (ep->state != EP_STATE_CLEANUP_START));

        if (signal_pending(current))
                flush_signals(current);
        timer_delete_sync(&ep->ofld_timer);

        bnx2i_ep_destroy_list_del(hba, ep);

        if (ep->state != EP_STATE_CLEANUP_CMPL)
                /* should never happen */
                printk(KERN_ALERT "bnx2i - conn destroy failed\n");

        return 0;
}


/**
 * bnx2i_ep_connect - establish TCP connection to target portal
 * @shost:              scsi host
 * @dst_addr:           target IP address
 * @non_blocking:       blocking or non-blocking call
 *
 * this routine initiates the TCP/IP connection by invoking Option-2 i/f
 *      with l5_core and the CNIC. This is a multi-step process of resolving
 *      route to target, create a iscsi connection context, handshaking with
 *      CNIC module to create/initialize the socket struct and finally
 *      sending down option-2 request to complete TCP 3-way handshake
 */
static struct iscsi_endpoint *bnx2i_ep_connect(struct Scsi_Host *shost,
                                               struct sockaddr *dst_addr,
                                               int non_blocking)
{
        u32 iscsi_cid = BNX2I_CID_RESERVED;
        struct sockaddr_in *desti = (struct sockaddr_in *) dst_addr;
        struct sockaddr_in6 *desti6;
        struct bnx2i_endpoint *bnx2i_ep;
        struct bnx2i_hba *hba;
        struct cnic_dev *cnic;
        struct cnic_sockaddr saddr;
        struct iscsi_endpoint *ep;
        int rc = 0;

        if (shost) {
                /* driver is given scsi host to work with */
                hba = iscsi_host_priv(shost);
        } else
                /*
                 * check if the given destination can be reached through
                 * a iscsi capable NetXtreme2 device
                 */
                hba = bnx2i_check_route(dst_addr);

        if (!hba) {
                rc = -EINVAL;
                goto nohba;
        }
        mutex_lock(&hba->net_dev_lock);

        if (bnx2i_adapter_ready(hba) || !hba->cid_que.cid_free_cnt) {
                rc = -EPERM;
                goto check_busy;
        }
        cnic = hba->cnic;
        ep = bnx2i_alloc_ep(hba);
        if (!ep) {
                rc = -ENOMEM;
                goto check_busy;
        }
        bnx2i_ep = ep->dd_data;

        atomic_set(&bnx2i_ep->num_active_cmds, 0);
        iscsi_cid = bnx2i_alloc_iscsi_cid(hba);
        if (iscsi_cid == -1) {
                printk(KERN_ALERT "bnx2i (%s): alloc_ep - unable to allocate "
                        "iscsi cid\n", hba->netdev->name);
                rc = -ENOMEM;
                bnx2i_free_ep(ep);
                goto check_busy;
        }
        bnx2i_ep->hba_age = hba->age;

        rc = bnx2i_alloc_qp_resc(hba, bnx2i_ep);
        if (rc != 0) {
                printk(KERN_ALERT "bnx2i (%s): ep_conn - alloc QP resc error"
                        "\n", hba->netdev->name);
                rc = -ENOMEM;
                goto qp_resc_err;
        }

        bnx2i_ep->ep_iscsi_cid = (u16)iscsi_cid;
        bnx2i_ep->state = EP_STATE_OFLD_START;
        bnx2i_ep_ofld_list_add(hba, bnx2i_ep);

        timer_setup(&bnx2i_ep->ofld_timer, bnx2i_ep_ofld_timer, 0);
        bnx2i_ep->ofld_timer.expires = 2 * HZ + jiffies;
        add_timer(&bnx2i_ep->ofld_timer);

        if (bnx2i_send_conn_ofld_req(hba, bnx2i_ep)) {
                if (bnx2i_ep->state == EP_STATE_OFLD_FAILED_CID_BUSY) {
                        printk(KERN_ALERT "bnx2i (%s): iscsi cid %d is busy\n",
                                hba->netdev->name, bnx2i_ep->ep_iscsi_cid);
                        rc = -EBUSY;
                } else
                        rc = -ENOSPC;
                printk(KERN_ALERT "bnx2i (%s): unable to send conn offld kwqe"
                        "\n", hba->netdev->name);
                bnx2i_ep_ofld_list_del(hba, bnx2i_ep);
                goto conn_failed;
        }

        /* Wait for CNIC hardware to setup conn context and return 'cid' */
        wait_event_interruptible(bnx2i_ep->ofld_wait,
                                 bnx2i_ep->state != EP_STATE_OFLD_START);

        if (signal_pending(current))
                flush_signals(current);
        timer_delete_sync(&bnx2i_ep->ofld_timer);

        bnx2i_ep_ofld_list_del(hba, bnx2i_ep);

        if (bnx2i_ep->state != EP_STATE_OFLD_COMPL) {
                if (bnx2i_ep->state == EP_STATE_OFLD_FAILED_CID_BUSY) {
                        printk(KERN_ALERT "bnx2i (%s): iscsi cid %d is busy\n",
                                hba->netdev->name, bnx2i_ep->ep_iscsi_cid);
                        rc = -EBUSY;
                } else
                        rc = -ENOSPC;
                goto conn_failed;
        }

        rc = cnic->cm_create(cnic, CNIC_ULP_ISCSI, bnx2i_ep->ep_cid,
                             iscsi_cid, &bnx2i_ep->cm_sk, bnx2i_ep);
        if (rc) {
                rc = -EINVAL;
                /* Need to terminate and cleanup the connection */
                goto release_ep;
        }

        bnx2i_ep->cm_sk->rcv_buf = 256 * 1024;
        bnx2i_ep->cm_sk->snd_buf = 256 * 1024;
        clear_bit(SK_TCP_TIMESTAMP, &bnx2i_ep->cm_sk->tcp_flags);

        memset(&saddr, 0, sizeof(saddr));
        if (dst_addr->sa_family == AF_INET) {
                desti = (struct sockaddr_in *) dst_addr;
                saddr.remote.v4 = *desti;
                saddr.local.v4.sin_family = desti->sin_family;
        } else if (dst_addr->sa_family == AF_INET6) {
                desti6 = (struct sockaddr_in6 *) dst_addr;
                saddr.remote.v6 = *desti6;
                saddr.local.v6.sin6_family = desti6->sin6_family;
        }

        bnx2i_ep->timestamp = jiffies;
        bnx2i_ep->state = EP_STATE_CONNECT_START;
        if (!test_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic)) {
                rc = -EINVAL;
                goto conn_failed;
        } else
                rc = cnic->cm_connect(bnx2i_ep->cm_sk, &saddr);
        if (rc)
                goto release_ep;

        bnx2i_ep_active_list_add(hba, bnx2i_ep);

        rc = bnx2i_map_ep_dbell_regs(bnx2i_ep);
        if (rc)
                goto del_active_ep;

        mutex_unlock(&hba->net_dev_lock);
        return ep;

del_active_ep:
        bnx2i_ep_active_list_del(hba, bnx2i_ep);
release_ep:
        if (bnx2i_tear_down_conn(hba, bnx2i_ep)) {
                mutex_unlock(&hba->net_dev_lock);
                return ERR_PTR(rc);
        }
conn_failed:
        bnx2i_free_qp_resc(hba, bnx2i_ep);
qp_resc_err:
        bnx2i_free_ep(ep);
check_busy:
        mutex_unlock(&hba->net_dev_lock);
nohba:
        return ERR_PTR(rc);
}


/**
 * bnx2i_ep_poll - polls for TCP connection establishement
 * @ep:                 TCP connection (endpoint) handle
 * @timeout_ms:         timeout value in milli secs
 *
 * polls for TCP connect request to complete
 */
static int bnx2i_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
{
        struct bnx2i_endpoint *bnx2i_ep;
        int rc = 0;

        bnx2i_ep = ep->dd_data;
        if ((bnx2i_ep->state == EP_STATE_IDLE) ||
            (bnx2i_ep->state == EP_STATE_CONNECT_FAILED) ||
            (bnx2i_ep->state == EP_STATE_OFLD_FAILED))
                return -1;
        if (bnx2i_ep->state == EP_STATE_CONNECT_COMPL)
                return 1;

        rc = wait_event_interruptible_timeout(bnx2i_ep->ofld_wait,
                                              ((bnx2i_ep->state ==
                                                EP_STATE_OFLD_FAILED) ||
                                               (bnx2i_ep->state ==
                                                EP_STATE_CONNECT_FAILED) ||
                                               (bnx2i_ep->state ==
                                                EP_STATE_CONNECT_COMPL)),
                                              msecs_to_jiffies(timeout_ms));
        if (bnx2i_ep->state == EP_STATE_OFLD_FAILED)
                rc = -1;

        if (rc > 0)
                return 1;
        else if (!rc)
                return 0;       /* timeout */
        else
                return rc;
}


/**
 * bnx2i_ep_tcp_conn_active - check EP state transition
 * @bnx2i_ep:           endpoint pointer
 *
 * check if underlying TCP connection is active
 */
static int bnx2i_ep_tcp_conn_active(struct bnx2i_endpoint *bnx2i_ep)
{
        int ret;
        int cnic_dev_10g = 0;

        if (test_bit(BNX2I_NX2_DEV_57710, &bnx2i_ep->hba->cnic_dev_type))
                cnic_dev_10g = 1;

        switch (bnx2i_ep->state) {
        case EP_STATE_CLEANUP_FAILED:
        case EP_STATE_OFLD_FAILED:
        case EP_STATE_DISCONN_TIMEDOUT:
                ret = 0;
                break;
        case EP_STATE_CONNECT_START:
        case EP_STATE_CONNECT_FAILED:
        case EP_STATE_CONNECT_COMPL:
        case EP_STATE_ULP_UPDATE_START:
        case EP_STATE_ULP_UPDATE_COMPL:
        case EP_STATE_TCP_FIN_RCVD:
        case EP_STATE_LOGOUT_SENT:
        case EP_STATE_LOGOUT_RESP_RCVD:
        case EP_STATE_ULP_UPDATE_FAILED:
                ret = 1;
                break;
        case EP_STATE_TCP_RST_RCVD:
                if (cnic_dev_10g)
                        ret = 0;
                else
                        ret = 1;
                break;
        default:
                ret = 0;
        }

        return ret;
}


/**
 * bnx2i_hw_ep_disconnect - executes TCP connection teardown process in the hw
 * @bnx2i_ep:           TCP connection (bnx2i endpoint) handle
 *
 * executes  TCP connection teardown process
 */
int bnx2i_hw_ep_disconnect(struct bnx2i_endpoint *bnx2i_ep)
{
        struct bnx2i_hba *hba = bnx2i_ep->hba;
        struct cnic_dev *cnic;
        struct iscsi_session *session = NULL;
        struct iscsi_conn *conn = NULL;
        int ret = 0;
        int close = 0;
        int close_ret = 0;

        if (!hba)
                return 0;

        cnic = hba->cnic;
        if (!cnic)
                return 0;

        if (bnx2i_ep->state == EP_STATE_IDLE ||
            bnx2i_ep->state == EP_STATE_DISCONN_TIMEDOUT)
                return 0;

        if (!bnx2i_ep_tcp_conn_active(bnx2i_ep))
                goto destroy_conn;

        if (bnx2i_ep->conn) {
                conn = bnx2i_ep->conn->cls_conn->dd_data;
                session = conn->session;
        }

        timer_setup(&bnx2i_ep->ofld_timer, bnx2i_ep_ofld_timer, 0);
        bnx2i_ep->ofld_timer.expires = hba->conn_teardown_tmo + jiffies;
        add_timer(&bnx2i_ep->ofld_timer);

        if (!test_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic))
                goto out;

        if (session) {
                spin_lock_bh(&session->frwd_lock);
                if (bnx2i_ep->state != EP_STATE_TCP_FIN_RCVD) {
                        if (session->state == ISCSI_STATE_LOGGING_OUT) {
                                if (bnx2i_ep->state == EP_STATE_LOGOUT_SENT) {
                                        /* Logout sent, but no resp */
                                        printk(KERN_ALERT "bnx2i (%s): WARNING"
                                                " logout response was not "
                                                "received!\n",
                                                bnx2i_ep->hba->netdev->name);
                                } else if (bnx2i_ep->state ==
                                           EP_STATE_LOGOUT_RESP_RCVD)
                                        close = 1;
                        }
                } else
                        close = 1;

                spin_unlock_bh(&session->frwd_lock);
        }

        bnx2i_ep->state = EP_STATE_DISCONN_START;

        if (close)
                close_ret = cnic->cm_close(bnx2i_ep->cm_sk);
        else
                close_ret = cnic->cm_abort(bnx2i_ep->cm_sk);

        if (close_ret)
                printk(KERN_ALERT "bnx2i (%s): close/abort(%d) returned %d\n",
                        bnx2i_ep->hba->netdev->name, close, close_ret);
        else
                /* wait for option-2 conn teardown */
                wait_event_interruptible(bnx2i_ep->ofld_wait,
                                ((bnx2i_ep->state != EP_STATE_DISCONN_START)
                                && (bnx2i_ep->state != EP_STATE_TCP_FIN_RCVD)));

        if (signal_pending(current))
                flush_signals(current);
        timer_delete_sync(&bnx2i_ep->ofld_timer);

destroy_conn:
        bnx2i_ep_active_list_del(hba, bnx2i_ep);
        if (bnx2i_tear_down_conn(hba, bnx2i_ep))
                return -EINVAL;
out:
        bnx2i_ep->state = EP_STATE_IDLE;
        return ret;
}


/**
 * bnx2i_ep_disconnect - executes TCP connection teardown process
 * @ep:         TCP connection (iscsi endpoint) handle
 *
 * executes  TCP connection teardown process
 */
static void bnx2i_ep_disconnect(struct iscsi_endpoint *ep)
{
        struct bnx2i_endpoint *bnx2i_ep;
        struct bnx2i_conn *bnx2i_conn = NULL;
        struct bnx2i_hba *hba;

        bnx2i_ep = ep->dd_data;

        /* driver should not attempt connection cleanup until TCP_CONNECT
         * completes either successfully or fails. Timeout is 9-secs, so
         * wait for it to complete
         */
        while ((bnx2i_ep->state == EP_STATE_CONNECT_START) &&
                !time_after(jiffies, bnx2i_ep->timestamp + (12 * HZ)))
                msleep(250);

        if (bnx2i_ep->conn)
                bnx2i_conn = bnx2i_ep->conn;
        hba = bnx2i_ep->hba;

        mutex_lock(&hba->net_dev_lock);

        if (bnx2i_ep->state == EP_STATE_DISCONN_TIMEDOUT)
                goto out;

        if (bnx2i_ep->state == EP_STATE_IDLE)
                goto free_resc;

        if (!test_bit(ADAPTER_STATE_UP, &hba->adapter_state) ||
            (bnx2i_ep->hba_age != hba->age)) {
                bnx2i_ep_active_list_del(hba, bnx2i_ep);
                goto free_resc;
        }

        /* Do all chip cleanup here */
        if (bnx2i_hw_ep_disconnect(bnx2i_ep)) {
                mutex_unlock(&hba->net_dev_lock);
                return;
        }
free_resc:
        bnx2i_free_qp_resc(hba, bnx2i_ep);

        if (bnx2i_conn)
                bnx2i_conn->ep = NULL;

        bnx2i_free_ep(ep);
out:
        mutex_unlock(&hba->net_dev_lock);

        wake_up_interruptible(&hba->eh_wait);
}


/**
 * bnx2i_nl_set_path - ISCSI_UEVENT_PATH_UPDATE user message handler
 * @shost:      scsi host pointer
 * @params:     pointer to buffer containing iscsi path message
 */
static int bnx2i_nl_set_path(struct Scsi_Host *shost, struct iscsi_path *params)
{
        struct bnx2i_hba *hba = iscsi_host_priv(shost);
        char *buf = (char *) params;
        u16 len = sizeof(*params);

        /* handled by cnic driver */
        hba->cnic->iscsi_nl_msg_recv(hba->cnic, ISCSI_UEVENT_PATH_UPDATE, buf,
                                     len);

        return 0;
}

static umode_t bnx2i_attr_is_visible(int param_type, int param)
{
        switch (param_type) {
        case ISCSI_HOST_PARAM:
                switch (param) {
                case ISCSI_HOST_PARAM_NETDEV_NAME:
                case ISCSI_HOST_PARAM_HWADDRESS:
                case ISCSI_HOST_PARAM_IPADDRESS:
                        return S_IRUGO;
                default:
                        return 0;
                }
        case ISCSI_PARAM:
                switch (param) {
                case ISCSI_PARAM_MAX_RECV_DLENGTH:
                case ISCSI_PARAM_MAX_XMIT_DLENGTH:
                case ISCSI_PARAM_HDRDGST_EN:
                case ISCSI_PARAM_DATADGST_EN:
                case ISCSI_PARAM_CONN_ADDRESS:
                case ISCSI_PARAM_CONN_PORT:
                case ISCSI_PARAM_EXP_STATSN:
                case ISCSI_PARAM_PERSISTENT_ADDRESS:
                case ISCSI_PARAM_PERSISTENT_PORT:
                case ISCSI_PARAM_PING_TMO:
                case ISCSI_PARAM_RECV_TMO:
                case ISCSI_PARAM_INITIAL_R2T_EN:
                case ISCSI_PARAM_MAX_R2T:
                case ISCSI_PARAM_IMM_DATA_EN:
                case ISCSI_PARAM_FIRST_BURST:
                case ISCSI_PARAM_MAX_BURST:
                case ISCSI_PARAM_PDU_INORDER_EN:
                case ISCSI_PARAM_DATASEQ_INORDER_EN:
                case ISCSI_PARAM_ERL:
                case ISCSI_PARAM_TARGET_NAME:
                case ISCSI_PARAM_TPGT:
                case ISCSI_PARAM_USERNAME:
                case ISCSI_PARAM_PASSWORD:
                case ISCSI_PARAM_USERNAME_IN:
                case ISCSI_PARAM_PASSWORD_IN:
                case ISCSI_PARAM_FAST_ABORT:
                case ISCSI_PARAM_ABORT_TMO:
                case ISCSI_PARAM_LU_RESET_TMO:
                case ISCSI_PARAM_TGT_RESET_TMO:
                case ISCSI_PARAM_IFACE_NAME:
                case ISCSI_PARAM_INITIATOR_NAME:
                case ISCSI_PARAM_BOOT_ROOT:
                case ISCSI_PARAM_BOOT_NIC:
                case ISCSI_PARAM_BOOT_TARGET:
                        return S_IRUGO;
                default:
                        return 0;
                }
        }

        return 0;
}

/*
 * 'Scsi_Host_Template' structure and 'iscsi_tranport' structure template
 * used while registering with the scsi host and iSCSI transport module.
 */
static const struct scsi_host_template bnx2i_host_template = {
        .module                 = THIS_MODULE,
        .name                   = "QLogic Offload iSCSI Initiator",
        .proc_name              = "bnx2i",
        .queuecommand           = iscsi_queuecommand,
        .eh_timed_out           = iscsi_eh_cmd_timed_out,
        .eh_abort_handler       = iscsi_eh_abort,
        .eh_device_reset_handler = iscsi_eh_device_reset,
        .eh_target_reset_handler = iscsi_eh_recover_target,
        .change_queue_depth     = scsi_change_queue_depth,
        .target_alloc           = iscsi_target_alloc,
        .can_queue              = 2048,
        .max_sectors            = 127,
        .cmd_per_lun            = 128,
        .this_id                = -1,
        .sg_tablesize           = ISCSI_MAX_BDS_PER_CMD,
        .shost_groups           = bnx2i_dev_groups,
        .track_queue_depth      = 1,
        .cmd_size               = sizeof(struct iscsi_cmd),
};

struct iscsi_transport bnx2i_iscsi_transport = {
        .owner                  = THIS_MODULE,
        .name                   = "bnx2i",
        .caps                   = CAP_RECOVERY_L0 | CAP_HDRDGST |
                                  CAP_MULTI_R2T | CAP_DATADGST |
                                  CAP_DATA_PATH_OFFLOAD |
                                  CAP_TEXT_NEGO,
        .create_session         = bnx2i_session_create,
        .destroy_session        = bnx2i_session_destroy,
        .create_conn            = bnx2i_conn_create,
        .bind_conn              = bnx2i_conn_bind,
        .unbind_conn            = iscsi_conn_unbind,
        .destroy_conn           = bnx2i_conn_destroy,
        .attr_is_visible        = bnx2i_attr_is_visible,
        .set_param              = iscsi_set_param,
        .get_conn_param         = iscsi_conn_get_param,
        .get_session_param      = iscsi_session_get_param,
        .get_host_param         = bnx2i_host_get_param,
        .start_conn             = bnx2i_conn_start,
        .stop_conn              = iscsi_conn_stop,
        .send_pdu               = iscsi_conn_send_pdu,
        .xmit_task              = bnx2i_task_xmit,
        .get_stats              = bnx2i_conn_get_stats,
        /* TCP connect - disconnect - option-2 interface calls */
        .get_ep_param           = bnx2i_ep_get_param,
        .ep_connect             = bnx2i_ep_connect,
        .ep_poll                = bnx2i_ep_poll,
        .ep_disconnect          = bnx2i_ep_disconnect,
        .set_path               = bnx2i_nl_set_path,
        /* Error recovery timeout call */
        .session_recovery_timedout = iscsi_session_recovery_timedout,
        .cleanup_task           = bnx2i_cleanup_task,
};