[mirror_ubuntu-artful-kernel.git] / drivers / scsi / qla2xxx / tcm_qla2xxx.c

/*******************************************************************************
 * This file contains tcm implementation using v4 configfs fabric infrastructure
 * for QLogic target mode HBAs
 *
 * ?? Copyright 2010-2011 RisingTide Systems LLC.
 *
 * Licensed to the Linux Foundation under the General Public License (GPL)
 * version 2.
 *
 * Author: Nicholas A. Bellinger <nab@risingtidesystems.com>
 *
 * tcm_qla2xxx_parse_wwn() and tcm_qla2xxx_format_wwn() contains code from
 * the TCM_FC / Open-FCoE.org fabric module.
 *
 * Copyright (c) 2010 Cisco Systems, Inc
 *
 * 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; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 ****************************************************************************/


#include <linux/module.h>
#include <linux/moduleparam.h>
#include <generated/utsrelease.h>
#include <linux/utsname.h>
#include <linux/init.h>
#include <linux/list.h>
#include <linux/slab.h>
#include <linux/kthread.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/configfs.h>
#include <linux/ctype.h>
#include <asm/unaligned.h>
#include <scsi/scsi.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_cmnd.h>
#include <target/target_core_base.h>
#include <target/target_core_fabric.h>
#include <target/target_core_fabric_configfs.h>
#include <target/target_core_configfs.h>
#include <target/configfs_macros.h>

#include "qla_def.h"
#include "qla_target.h"
#include "tcm_qla2xxx.h"

struct workqueue_struct *tcm_qla2xxx_free_wq;
struct workqueue_struct *tcm_qla2xxx_cmd_wq;

static int tcm_qla2xxx_check_true(struct se_portal_group *se_tpg)
{
        return 1;
}

static int tcm_qla2xxx_check_false(struct se_portal_group *se_tpg)
{
        return 0;
}

/*
 * Parse WWN.
 * If strict, we require lower-case hex and colon separators to be sure
 * the name is the same as what would be generated by ft_format_wwn()
 * so the name and wwn are mapped one-to-one.
 */
static ssize_t tcm_qla2xxx_parse_wwn(const char *name, u64 *wwn, int strict)
{
        const char *cp;
        char c;
        u32 nibble;
        u32 byte = 0;
        u32 pos = 0;
        u32 err;

        *wwn = 0;
        for (cp = name; cp < &name[TCM_QLA2XXX_NAMELEN - 1]; cp++) {
                c = *cp;
                if (c == '\n' && cp[1] == '\0')
                        continue;
                if (strict && pos++ == 2 && byte++ < 7) {
                        pos = 0;
                        if (c == ':')
                                continue;
                        err = 1;
                        goto fail;
                }
                if (c == '\0') {
                        err = 2;
                        if (strict && byte != 8)
                                goto fail;
                        return cp - name;
                }
                err = 3;
                if (isdigit(c))
                        nibble = c - '0';
                else if (isxdigit(c) && (islower(c) || !strict))
                        nibble = tolower(c) - 'a' + 10;
                else
                        goto fail;
                *wwn = (*wwn << 4) | nibble;
        }
        err = 4;
fail:
        pr_debug("err %u len %zu pos %u byte %u\n",
                        err, cp - name, pos, byte);
        return -1;
}

static ssize_t tcm_qla2xxx_format_wwn(char *buf, size_t len, u64 wwn)
{
        u8 b[8];

        put_unaligned_be64(wwn, b);
        return snprintf(buf, len,
                "%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x",
                b[0], b[1], b[2], b[3], b[4], b[5], b[6], b[7]);
}

static char *tcm_qla2xxx_get_fabric_name(void)
{
        return "qla2xxx";
}

/*
 * From drivers/scsi/scsi_transport_fc.c:fc_parse_wwn
 */
static int tcm_qla2xxx_npiv_extract_wwn(const char *ns, u64 *nm)
{
        unsigned int i, j;
        u8 wwn[8];

        memset(wwn, 0, sizeof(wwn));

        /* Validate and store the new name */
        for (i = 0, j = 0; i < 16; i++) {
                int value;

                value = hex_to_bin(*ns++);
                if (value >= 0)
                        j = (j << 4) | value;
                else
                        return -EINVAL;

                if (i % 2) {
                        wwn[i/2] = j & 0xff;
                        j = 0;
                }
        }

        *nm = wwn_to_u64(wwn);
        return 0;
}

/*
 * This parsing logic follows drivers/scsi/scsi_transport_fc.c:
 * store_fc_host_vport_create()
 */
static int tcm_qla2xxx_npiv_parse_wwn(
        const char *name,
        size_t count,
        u64 *wwpn,
        u64 *wwnn)
{
        unsigned int cnt = count;
        int rc;

        *wwpn = 0;
        *wwnn = 0;

        /* count may include a LF at end of string */
        if (name[cnt-1] == '\n')
                cnt--;

        /* validate we have enough characters for WWPN */
        if ((cnt != (16+1+16)) || (name[16] != ':'))
                return -EINVAL;

        rc = tcm_qla2xxx_npiv_extract_wwn(&name[0], wwpn);
        if (rc != 0)
                return rc;

        rc = tcm_qla2xxx_npiv_extract_wwn(&name[17], wwnn);
        if (rc != 0)
                return rc;

        return 0;
}

static ssize_t tcm_qla2xxx_npiv_format_wwn(char *buf, size_t len,
                                        u64 wwpn, u64 wwnn)
{
        u8 b[8], b2[8];

        put_unaligned_be64(wwpn, b);
        put_unaligned_be64(wwnn, b2);
        return snprintf(buf, len,
                "%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x,"
                "%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x",
                b[0], b[1], b[2], b[3], b[4], b[5], b[6], b[7],
                b2[0], b2[1], b2[2], b2[3], b2[4], b2[5], b2[6], b2[7]);
}

static char *tcm_qla2xxx_npiv_get_fabric_name(void)
{
        return "qla2xxx_npiv";
}

static u8 tcm_qla2xxx_get_fabric_proto_ident(struct se_portal_group *se_tpg)
{
        struct tcm_qla2xxx_tpg *tpg = container_of(se_tpg,
                                struct tcm_qla2xxx_tpg, se_tpg);
        struct tcm_qla2xxx_lport *lport = tpg->lport;
        u8 proto_id;

        switch (lport->lport_proto_id) {
        case SCSI_PROTOCOL_FCP:
        default:
                proto_id = fc_get_fabric_proto_ident(se_tpg);
                break;
        }

        return proto_id;
}

static char *tcm_qla2xxx_get_fabric_wwn(struct se_portal_group *se_tpg)
{
        struct tcm_qla2xxx_tpg *tpg = container_of(se_tpg,
                                struct tcm_qla2xxx_tpg, se_tpg);
        struct tcm_qla2xxx_lport *lport = tpg->lport;

        return &lport->lport_name[0];
}

static char *tcm_qla2xxx_npiv_get_fabric_wwn(struct se_portal_group *se_tpg)
{
        struct tcm_qla2xxx_tpg *tpg = container_of(se_tpg,
                                struct tcm_qla2xxx_tpg, se_tpg);
        struct tcm_qla2xxx_lport *lport = tpg->lport;

        return &lport->lport_npiv_name[0];
}

static u16 tcm_qla2xxx_get_tag(struct se_portal_group *se_tpg)
{
        struct tcm_qla2xxx_tpg *tpg = container_of(se_tpg,
                                struct tcm_qla2xxx_tpg, se_tpg);
        return tpg->lport_tpgt;
}

static u32 tcm_qla2xxx_get_default_depth(struct se_portal_group *se_tpg)
{
        return 1;
}

static u32 tcm_qla2xxx_get_pr_transport_id(
        struct se_portal_group *se_tpg,
        struct se_node_acl *se_nacl,
        struct t10_pr_registration *pr_reg,
        int *format_code,
        unsigned char *buf)
{
        struct tcm_qla2xxx_tpg *tpg = container_of(se_tpg,
                                struct tcm_qla2xxx_tpg, se_tpg);
        struct tcm_qla2xxx_lport *lport = tpg->lport;
        int ret = 0;

        switch (lport->lport_proto_id) {
        case SCSI_PROTOCOL_FCP:
        default:
                ret = fc_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
                                        format_code, buf);
                break;
        }

        return ret;
}

static u32 tcm_qla2xxx_get_pr_transport_id_len(
        struct se_portal_group *se_tpg,
        struct se_node_acl *se_nacl,
        struct t10_pr_registration *pr_reg,
        int *format_code)
{
        struct tcm_qla2xxx_tpg *tpg = container_of(se_tpg,
                                struct tcm_qla2xxx_tpg, se_tpg);
        struct tcm_qla2xxx_lport *lport = tpg->lport;
        int ret = 0;

        switch (lport->lport_proto_id) {
        case SCSI_PROTOCOL_FCP:
        default:
                ret = fc_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
                                        format_code);
                break;
        }

        return ret;
}

static char *tcm_qla2xxx_parse_pr_out_transport_id(
        struct se_portal_group *se_tpg,
        const char *buf,
        u32 *out_tid_len,
        char **port_nexus_ptr)
{
        struct tcm_qla2xxx_tpg *tpg = container_of(se_tpg,
                                struct tcm_qla2xxx_tpg, se_tpg);
        struct tcm_qla2xxx_lport *lport = tpg->lport;
        char *tid = NULL;

        switch (lport->lport_proto_id) {
        case SCSI_PROTOCOL_FCP:
        default:
                tid = fc_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
                                        port_nexus_ptr);
                break;
        }

        return tid;
}

static int tcm_qla2xxx_check_demo_mode(struct se_portal_group *se_tpg)
{
        struct tcm_qla2xxx_tpg *tpg = container_of(se_tpg,
                                struct tcm_qla2xxx_tpg, se_tpg);

        return QLA_TPG_ATTRIB(tpg)->generate_node_acls;
}

static int tcm_qla2xxx_check_demo_mode_cache(struct se_portal_group *se_tpg)
{
        struct tcm_qla2xxx_tpg *tpg = container_of(se_tpg,
                                struct tcm_qla2xxx_tpg, se_tpg);

        return QLA_TPG_ATTRIB(tpg)->cache_dynamic_acls;
}

static int tcm_qla2xxx_check_demo_write_protect(struct se_portal_group *se_tpg)
{
        struct tcm_qla2xxx_tpg *tpg = container_of(se_tpg,
                                struct tcm_qla2xxx_tpg, se_tpg);

        return QLA_TPG_ATTRIB(tpg)->demo_mode_write_protect;
}

static int tcm_qla2xxx_check_prod_write_protect(struct se_portal_group *se_tpg)
{
        struct tcm_qla2xxx_tpg *tpg = container_of(se_tpg,
                                struct tcm_qla2xxx_tpg, se_tpg);

        return QLA_TPG_ATTRIB(tpg)->prod_mode_write_protect;
}

static struct se_node_acl *tcm_qla2xxx_alloc_fabric_acl(
        struct se_portal_group *se_tpg)
{
        struct tcm_qla2xxx_nacl *nacl;

        nacl = kzalloc(sizeof(struct tcm_qla2xxx_nacl), GFP_KERNEL);
        if (!nacl) {
                pr_err("Unable to alocate struct tcm_qla2xxx_nacl\n");
                return NULL;
        }

        return &nacl->se_node_acl;
}

static void tcm_qla2xxx_release_fabric_acl(
        struct se_portal_group *se_tpg,
        struct se_node_acl *se_nacl)
{
        struct tcm_qla2xxx_nacl *nacl = container_of(se_nacl,
                        struct tcm_qla2xxx_nacl, se_node_acl);
        kfree(nacl);
}

static u32 tcm_qla2xxx_tpg_get_inst_index(struct se_portal_group *se_tpg)
{
        struct tcm_qla2xxx_tpg *tpg = container_of(se_tpg,
                                struct tcm_qla2xxx_tpg, se_tpg);

        return tpg->lport_tpgt;
}

static void tcm_qla2xxx_complete_mcmd(struct work_struct *work)
{
        struct qla_tgt_mgmt_cmd *mcmd = container_of(work,
                        struct qla_tgt_mgmt_cmd, free_work);

        transport_generic_free_cmd(&mcmd->se_cmd, 0);
}

/*
 * Called from qla_target_template->free_mcmd(), and will call
 * tcm_qla2xxx_release_cmd() via normal struct target_core_fabric_ops
 * release callback.  qla_hw_data->hardware_lock is expected to be held
 */
static void tcm_qla2xxx_free_mcmd(struct qla_tgt_mgmt_cmd *mcmd)
{
        INIT_WORK(&mcmd->free_work, tcm_qla2xxx_complete_mcmd);
        queue_work(tcm_qla2xxx_free_wq, &mcmd->free_work);
}

static void tcm_qla2xxx_complete_free(struct work_struct *work)
{
        struct qla_tgt_cmd *cmd = container_of(work, struct qla_tgt_cmd, work);

        transport_generic_free_cmd(&cmd->se_cmd, 0);
}

/*
 * Called from qla_target_template->free_cmd(), and will call
 * tcm_qla2xxx_release_cmd via normal struct target_core_fabric_ops
 * release callback.  qla_hw_data->hardware_lock is expected to be held
 */
static void tcm_qla2xxx_free_cmd(struct qla_tgt_cmd *cmd)
{
        INIT_WORK(&cmd->work, tcm_qla2xxx_complete_free);
        queue_work(tcm_qla2xxx_free_wq, &cmd->work);
}

/*
 * Called from struct target_core_fabric_ops->check_stop_free() context
 */
static int tcm_qla2xxx_check_stop_free(struct se_cmd *se_cmd)
{
        return target_put_sess_cmd(se_cmd->se_sess, se_cmd);
}

/* tcm_qla2xxx_release_cmd - Callback from TCM Core to release underlying
 * fabric descriptor @se_cmd command to release
 */
static void tcm_qla2xxx_release_cmd(struct se_cmd *se_cmd)
{
        struct qla_tgt_cmd *cmd;

        if (se_cmd->se_cmd_flags & SCF_SCSI_TMR_CDB) {
                struct qla_tgt_mgmt_cmd *mcmd = container_of(se_cmd,
                                struct qla_tgt_mgmt_cmd, se_cmd);
                qlt_free_mcmd(mcmd);
                return;
        }

        cmd = container_of(se_cmd, struct qla_tgt_cmd, se_cmd);
        qlt_free_cmd(cmd);
}

static int tcm_qla2xxx_shutdown_session(struct se_session *se_sess)
{
        struct qla_tgt_sess *sess = se_sess->fabric_sess_ptr;
        struct scsi_qla_host *vha;
        unsigned long flags;

        BUG_ON(!sess);
        vha = sess->vha;

        spin_lock_irqsave(&vha->hw->hardware_lock, flags);
        target_sess_cmd_list_set_waiting(se_sess);
        spin_unlock_irqrestore(&vha->hw->hardware_lock, flags);

        return 1;
}

static void tcm_qla2xxx_close_session(struct se_session *se_sess)
{
        struct qla_tgt_sess *sess = se_sess->fabric_sess_ptr;
        struct scsi_qla_host *vha;
        unsigned long flags;

        BUG_ON(!sess);
        vha = sess->vha;

        spin_lock_irqsave(&vha->hw->hardware_lock, flags);
        qlt_unreg_sess(sess);
        spin_unlock_irqrestore(&vha->hw->hardware_lock, flags);
}

static u32 tcm_qla2xxx_sess_get_index(struct se_session *se_sess)
{
        return 0;
}

/*
 * The LIO target core uses DMA_TO_DEVICE to mean that data is going
 * to the target (eg handling a WRITE) and DMA_FROM_DEVICE to mean
 * that data is coming from the target (eg handling a READ).  However,
 * this is just the opposite of what we have to tell the DMA mapping
 * layer -- eg when handling a READ, the HBA will have to DMA the data
 * out of memory so it can send it to the initiator, which means we
 * need to use DMA_TO_DEVICE when we map the data.
 */
static enum dma_data_direction tcm_qla2xxx_mapping_dir(struct se_cmd *se_cmd)
{
        if (se_cmd->se_cmd_flags & SCF_BIDI)
                return DMA_BIDIRECTIONAL;

        switch (se_cmd->data_direction) {
        case DMA_TO_DEVICE:
                return DMA_FROM_DEVICE;
        case DMA_FROM_DEVICE:
                return DMA_TO_DEVICE;
        case DMA_NONE:
        default:
                return DMA_NONE;
        }
}

static int tcm_qla2xxx_write_pending(struct se_cmd *se_cmd)
{
        struct qla_tgt_cmd *cmd = container_of(se_cmd,
                                struct qla_tgt_cmd, se_cmd);

        cmd->bufflen = se_cmd->data_length;
        cmd->dma_data_direction = tcm_qla2xxx_mapping_dir(se_cmd);

        cmd->sg_cnt = se_cmd->t_data_nents;
        cmd->sg = se_cmd->t_data_sg;

        /*
         * qla_target.c:qlt_rdy_to_xfer() will call pci_map_sg() to setup
         * the SGL mappings into PCIe memory for incoming FCP WRITE data.
         */
        return qlt_rdy_to_xfer(cmd);
}

static int tcm_qla2xxx_write_pending_status(struct se_cmd *se_cmd)
{
        unsigned long flags;
        /*
         * Check for WRITE_PENDING status to determine if we need to wait for
         * CTIO aborts to be posted via hardware in tcm_qla2xxx_handle_data().
         */
        spin_lock_irqsave(&se_cmd->t_state_lock, flags);
        if (se_cmd->t_state == TRANSPORT_WRITE_PENDING ||
            se_cmd->t_state == TRANSPORT_COMPLETE_QF_WP) {
                spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
                wait_for_completion_timeout(&se_cmd->t_transport_stop_comp,
                                                3000);
                return 0;
        }
        spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);

        return 0;
}

static void tcm_qla2xxx_set_default_node_attrs(struct se_node_acl *nacl)
{
        return;
}

static u32 tcm_qla2xxx_get_task_tag(struct se_cmd *se_cmd)
{
        struct qla_tgt_cmd *cmd = container_of(se_cmd,
                                struct qla_tgt_cmd, se_cmd);

        return cmd->tag;
}

static int tcm_qla2xxx_get_cmd_state(struct se_cmd *se_cmd)
{
        return 0;
}

/*
 * Called from process context in qla_target.c:qlt_do_work() code
 */
static int tcm_qla2xxx_handle_cmd(scsi_qla_host_t *vha, struct qla_tgt_cmd *cmd,
        unsigned char *cdb, uint32_t data_length, int fcp_task_attr,
        int data_dir, int bidi)
{
        struct se_cmd *se_cmd = &cmd->se_cmd;
        struct se_session *se_sess;
        struct qla_tgt_sess *sess;
        int flags = TARGET_SCF_ACK_KREF;

        if (bidi)
                flags |= TARGET_SCF_BIDI_OP;

        sess = cmd->sess;
        if (!sess) {
                pr_err("Unable to locate struct qla_tgt_sess from qla_tgt_cmd\n");
                return -EINVAL;
        }

        se_sess = sess->se_sess;
        if (!se_sess) {
                pr_err("Unable to locate active struct se_session\n");
                return -EINVAL;
        }

        return target_submit_cmd(se_cmd, se_sess, cdb, &cmd->sense_buffer[0],
                                cmd->unpacked_lun, data_length, fcp_task_attr,
                                data_dir, flags);
}

static void tcm_qla2xxx_handle_data_work(struct work_struct *work)
{
        struct qla_tgt_cmd *cmd = container_of(work, struct qla_tgt_cmd, work);

        /*
         * Ensure that the complete FCP WRITE payload has been received.
         * Otherwise return an exception via CHECK_CONDITION status.
         */
        if (!cmd->write_data_transferred) {
                /*
                 * Check if se_cmd has already been aborted via LUN_RESET, and
                 * waiting upon completion in tcm_qla2xxx_write_pending_status()
                 */
                if (cmd->se_cmd.transport_state & CMD_T_ABORTED) {
                        complete(&cmd->se_cmd.t_transport_stop_comp);
                        return;
                }

                cmd->se_cmd.scsi_sense_reason = TCM_CHECK_CONDITION_ABORT_CMD;
                transport_generic_request_failure(&cmd->se_cmd);
                return;
        }

        return target_execute_cmd(&cmd->se_cmd);
}

/*
 * Called from qla_target.c:qlt_do_ctio_completion()
 */
static void tcm_qla2xxx_handle_data(struct qla_tgt_cmd *cmd)
{
        INIT_WORK(&cmd->work, tcm_qla2xxx_handle_data_work);
        queue_work(tcm_qla2xxx_free_wq, &cmd->work);
}

/*
 * Called from qla_target.c:qlt_issue_task_mgmt()
 */
static int tcm_qla2xxx_handle_tmr(struct qla_tgt_mgmt_cmd *mcmd, uint32_t lun,
        uint8_t tmr_func, uint32_t tag)
{
        struct qla_tgt_sess *sess = mcmd->sess;
        struct se_cmd *se_cmd = &mcmd->se_cmd;

        return target_submit_tmr(se_cmd, sess->se_sess, NULL, lun, mcmd,
                        tmr_func, GFP_ATOMIC, tag, TARGET_SCF_ACK_KREF);
}

static int tcm_qla2xxx_queue_data_in(struct se_cmd *se_cmd)
{
        struct qla_tgt_cmd *cmd = container_of(se_cmd,
                                struct qla_tgt_cmd, se_cmd);

        cmd->bufflen = se_cmd->data_length;
        cmd->dma_data_direction = tcm_qla2xxx_mapping_dir(se_cmd);
        cmd->aborted = (se_cmd->transport_state & CMD_T_ABORTED);

        cmd->sg_cnt = se_cmd->t_data_nents;
        cmd->sg = se_cmd->t_data_sg;
        cmd->offset = 0;

        /*
         * Now queue completed DATA_IN the qla2xxx LLD and response ring
         */
        return qlt_xmit_response(cmd, QLA_TGT_XMIT_DATA|QLA_TGT_XMIT_STATUS,
                                se_cmd->scsi_status);
}

static int tcm_qla2xxx_queue_status(struct se_cmd *se_cmd)
{
        struct qla_tgt_cmd *cmd = container_of(se_cmd,
                                struct qla_tgt_cmd, se_cmd);
        int xmit_type = QLA_TGT_XMIT_STATUS;

        cmd->bufflen = se_cmd->data_length;
        cmd->sg = NULL;
        cmd->sg_cnt = 0;
        cmd->offset = 0;
        cmd->dma_data_direction = tcm_qla2xxx_mapping_dir(se_cmd);
        cmd->aborted = (se_cmd->transport_state & CMD_T_ABORTED);

        if (se_cmd->data_direction == DMA_FROM_DEVICE) {
                /*
                 * For FCP_READ with CHECK_CONDITION status, clear cmd->bufflen
                 * for qla_tgt_xmit_response LLD code
                 */
                se_cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
                se_cmd->residual_count = se_cmd->data_length;

                cmd->bufflen = 0;
        }
        /*
         * Now queue status response to qla2xxx LLD code and response ring
         */
        return qlt_xmit_response(cmd, xmit_type, se_cmd->scsi_status);
}

static int tcm_qla2xxx_queue_tm_rsp(struct se_cmd *se_cmd)
{
        struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
        struct qla_tgt_mgmt_cmd *mcmd = container_of(se_cmd,
                                struct qla_tgt_mgmt_cmd, se_cmd);

        pr_debug("queue_tm_rsp: mcmd: %p func: 0x%02x response: 0x%02x\n",
                        mcmd, se_tmr->function, se_tmr->response);
        /*
         * Do translation between TCM TM response codes and
         * QLA2xxx FC TM response codes.
         */
        switch (se_tmr->response) {
        case TMR_FUNCTION_COMPLETE:
                mcmd->fc_tm_rsp = FC_TM_SUCCESS;
                break;
        case TMR_TASK_DOES_NOT_EXIST:
                mcmd->fc_tm_rsp = FC_TM_BAD_CMD;
                break;
        case TMR_FUNCTION_REJECTED:
                mcmd->fc_tm_rsp = FC_TM_REJECT;
                break;
        case TMR_LUN_DOES_NOT_EXIST:
        default:
                mcmd->fc_tm_rsp = FC_TM_FAILED;
                break;
        }
        /*
         * Queue the TM response to QLA2xxx LLD to build a
         * CTIO response packet.
         */
        qlt_xmit_tm_rsp(mcmd);

        return 0;
}

static u16 tcm_qla2xxx_get_fabric_sense_len(void)
{
        return 0;
}

static u16 tcm_qla2xxx_set_fabric_sense_len(struct se_cmd *se_cmd,
                                        u32 sense_length)
{
        return 0;
}

/* Local pointer to allocated TCM configfs fabric module */
struct target_fabric_configfs *tcm_qla2xxx_fabric_configfs;
struct target_fabric_configfs *tcm_qla2xxx_npiv_fabric_configfs;

static void tcm_qla2xxx_clear_sess_lookup(struct tcm_qla2xxx_lport *,
                        struct tcm_qla2xxx_nacl *, struct qla_tgt_sess *);
/*
 * Expected to be called with struct qla_hw_data->hardware_lock held
 */
static void tcm_qla2xxx_clear_nacl_from_fcport_map(struct qla_tgt_sess *sess)
{
        struct se_node_acl *se_nacl = sess->se_sess->se_node_acl;
        struct se_portal_group *se_tpg = se_nacl->se_tpg;
        struct se_wwn *se_wwn = se_tpg->se_tpg_wwn;
        struct tcm_qla2xxx_lport *lport = container_of(se_wwn,
                                struct tcm_qla2xxx_lport, lport_wwn);
        struct tcm_qla2xxx_nacl *nacl = container_of(se_nacl,
                                struct tcm_qla2xxx_nacl, se_node_acl);
        void *node;

        pr_debug("fc_rport domain: port_id 0x%06x\n", nacl->nport_id);

        node = btree_remove32(&lport->lport_fcport_map, nacl->nport_id);
        WARN_ON(node && (node != se_nacl));

        pr_debug("Removed from fcport_map: %p for WWNN: 0x%016LX, port_id: 0x%06x\n",
            se_nacl, nacl->nport_wwnn, nacl->nport_id);
        /*
         * Now clear the se_nacl and session pointers from our HW lport lookup
         * table mapping for this initiator's fabric S_ID and LOOP_ID entries.
         *
         * This is done ahead of callbacks into tcm_qla2xxx_free_session() ->
         * target_wait_for_sess_cmds() before the session waits for outstanding
         * I/O to complete, to avoid a race between session shutdown execution
         * and incoming ATIOs or TMRs picking up a stale se_node_act reference.
         */
        tcm_qla2xxx_clear_sess_lookup(lport, nacl, sess);
}

static void tcm_qla2xxx_release_session(struct kref *kref)
{
        struct se_session *se_sess = container_of(kref,
                        struct se_session, sess_kref);

        qlt_unreg_sess(se_sess->fabric_sess_ptr);
}

static void tcm_qla2xxx_put_session(struct se_session *se_sess)
{
        struct qla_tgt_sess *sess = se_sess->fabric_sess_ptr;
        struct qla_hw_data *ha = sess->vha->hw;
        unsigned long flags;

        spin_lock_irqsave(&ha->hardware_lock, flags);
        kref_put(&se_sess->sess_kref, tcm_qla2xxx_release_session);
        spin_unlock_irqrestore(&ha->hardware_lock, flags);
}

static void tcm_qla2xxx_put_sess(struct qla_tgt_sess *sess)
{
        tcm_qla2xxx_put_session(sess->se_sess);
}

static void tcm_qla2xxx_shutdown_sess(struct qla_tgt_sess *sess)
{
        tcm_qla2xxx_shutdown_session(sess->se_sess);
}

static struct se_node_acl *tcm_qla2xxx_make_nodeacl(
        struct se_portal_group *se_tpg,
        struct config_group *group,
        const char *name)
{
        struct se_node_acl *se_nacl, *se_nacl_new;
        struct tcm_qla2xxx_nacl *nacl;
        u64 wwnn;
        u32 qla2xxx_nexus_depth;

        if (tcm_qla2xxx_parse_wwn(name, &wwnn, 1) < 0)
                return ERR_PTR(-EINVAL);

        se_nacl_new = tcm_qla2xxx_alloc_fabric_acl(se_tpg);
        if (!se_nacl_new)
                return ERR_PTR(-ENOMEM);
/* #warning FIXME: Hardcoded qla2xxx_nexus depth in tcm_qla2xxx_make_nodeacl */
        qla2xxx_nexus_depth = 1;

        /*
         * se_nacl_new may be released by core_tpg_add_initiator_node_acl()
         * when converting a NodeACL from demo mode -> explict
         */
        se_nacl = core_tpg_add_initiator_node_acl(se_tpg, se_nacl_new,
                                name, qla2xxx_nexus_depth);
        if (IS_ERR(se_nacl)) {
                tcm_qla2xxx_release_fabric_acl(se_tpg, se_nacl_new);
                return se_nacl;
        }
        /*
         * Locate our struct tcm_qla2xxx_nacl and set the FC Nport WWPN
         */
        nacl = container_of(se_nacl, struct tcm_qla2xxx_nacl, se_node_acl);
        nacl->nport_wwnn = wwnn;
        tcm_qla2xxx_format_wwn(&nacl->nport_name[0], TCM_QLA2XXX_NAMELEN, wwnn);

        return se_nacl;
}

static void tcm_qla2xxx_drop_nodeacl(struct se_node_acl *se_acl)
{
        struct se_portal_group *se_tpg = se_acl->se_tpg;
        struct tcm_qla2xxx_nacl *nacl = container_of(se_acl,
                                struct tcm_qla2xxx_nacl, se_node_acl);

        core_tpg_del_initiator_node_acl(se_tpg, se_acl, 1);
        kfree(nacl);
}

/* Start items for tcm_qla2xxx_tpg_attrib_cit */

#define DEF_QLA_TPG_ATTRIB(name)                                        \
                                                                        \
static ssize_t tcm_qla2xxx_tpg_attrib_show_##name(                      \
        struct se_portal_group *se_tpg,                                 \
        char *page)                                                     \
{                                                                       \
        struct tcm_qla2xxx_tpg *tpg = container_of(se_tpg,              \
                        struct tcm_qla2xxx_tpg, se_tpg);                \
                                                                        \
        return sprintf(page, "%u\n", QLA_TPG_ATTRIB(tpg)->name);        \
}                                                                       \
                                                                        \
static ssize_t tcm_qla2xxx_tpg_attrib_store_##name(                     \
        struct se_portal_group *se_tpg,                                 \
        const char *page,                                               \
        size_t count)                                                   \
{                                                                       \
        struct tcm_qla2xxx_tpg *tpg = container_of(se_tpg,              \
                        struct tcm_qla2xxx_tpg, se_tpg);                \
        unsigned long val;                                              \
        int ret;                                                        \
                                                                        \
        ret = kstrtoul(page, 0, &val);                                  \
        if (ret < 0) {                                                  \
                pr_err("kstrtoul() failed with"                         \
                                " ret: %d\n", ret);                     \
                return -EINVAL;                                         \
        }                                                               \
        ret = tcm_qla2xxx_set_attrib_##name(tpg, val);                  \
                                                                        \
        return (!ret) ? count : -EINVAL;                                \
}

#define DEF_QLA_TPG_ATTR_BOOL(_name)                                    \
                                                                        \
static int tcm_qla2xxx_set_attrib_##_name(                              \
        struct tcm_qla2xxx_tpg *tpg,                                    \
        unsigned long val)                                              \
{                                                                       \
        struct tcm_qla2xxx_tpg_attrib *a = &tpg->tpg_attrib;            \
                                                                        \
        if ((val != 0) && (val != 1)) {                                 \
                pr_err("Illegal boolean value %lu\n", val);             \
                return -EINVAL;                                         \
        }                                                               \
                                                                        \
        a->_name = val;                                                 \
        return 0;                                                       \
}

#define QLA_TPG_ATTR(_name, _mode) \
        TF_TPG_ATTRIB_ATTR(tcm_qla2xxx, _name, _mode);

/*
 * Define tcm_qla2xxx_tpg_attrib_s_generate_node_acls
 */
DEF_QLA_TPG_ATTR_BOOL(generate_node_acls);
DEF_QLA_TPG_ATTRIB(generate_node_acls);
QLA_TPG_ATTR(generate_node_acls, S_IRUGO | S_IWUSR);

/*
 Define tcm_qla2xxx_attrib_s_cache_dynamic_acls
 */
DEF_QLA_TPG_ATTR_BOOL(cache_dynamic_acls);
DEF_QLA_TPG_ATTRIB(cache_dynamic_acls);
QLA_TPG_ATTR(cache_dynamic_acls, S_IRUGO | S_IWUSR);

/*
 * Define tcm_qla2xxx_tpg_attrib_s_demo_mode_write_protect
 */
DEF_QLA_TPG_ATTR_BOOL(demo_mode_write_protect);
DEF_QLA_TPG_ATTRIB(demo_mode_write_protect);
QLA_TPG_ATTR(demo_mode_write_protect, S_IRUGO | S_IWUSR);

/*
 * Define tcm_qla2xxx_tpg_attrib_s_prod_mode_write_protect
 */
DEF_QLA_TPG_ATTR_BOOL(prod_mode_write_protect);
DEF_QLA_TPG_ATTRIB(prod_mode_write_protect);
QLA_TPG_ATTR(prod_mode_write_protect, S_IRUGO | S_IWUSR);

static struct configfs_attribute *tcm_qla2xxx_tpg_attrib_attrs[] = {
        &tcm_qla2xxx_tpg_attrib_generate_node_acls.attr,
        &tcm_qla2xxx_tpg_attrib_cache_dynamic_acls.attr,
        &tcm_qla2xxx_tpg_attrib_demo_mode_write_protect.attr,
        &tcm_qla2xxx_tpg_attrib_prod_mode_write_protect.attr,
        NULL,
};

/* End items for tcm_qla2xxx_tpg_attrib_cit */

static ssize_t tcm_qla2xxx_tpg_show_enable(
        struct se_portal_group *se_tpg,
        char *page)
{
        struct tcm_qla2xxx_tpg *tpg = container_of(se_tpg,
                        struct tcm_qla2xxx_tpg, se_tpg);

        return snprintf(page, PAGE_SIZE, "%d\n",
                        atomic_read(&tpg->lport_tpg_enabled));
}

static ssize_t tcm_qla2xxx_tpg_store_enable(
        struct se_portal_group *se_tpg,
        const char *page,
        size_t count)
{
        struct se_wwn *se_wwn = se_tpg->se_tpg_wwn;
        struct tcm_qla2xxx_lport *lport = container_of(se_wwn,
                        struct tcm_qla2xxx_lport, lport_wwn);
        struct scsi_qla_host *vha = lport->qla_vha;
        struct qla_hw_data *ha = vha->hw;
        struct tcm_qla2xxx_tpg *tpg = container_of(se_tpg,
                        struct tcm_qla2xxx_tpg, se_tpg);
        unsigned long op;
        int rc;

        rc = kstrtoul(page, 0, &op);
        if (rc < 0) {
                pr_err("kstrtoul() returned %d\n", rc);
                return -EINVAL;
        }
        if ((op != 1) && (op != 0)) {
                pr_err("Illegal value for tpg_enable: %lu\n", op);
                return -EINVAL;
        }

        if (op) {
                atomic_set(&tpg->lport_tpg_enabled, 1);
                qlt_enable_vha(vha);
        } else {
                if (!ha->tgt.qla_tgt) {
                        pr_err("truct qla_hw_data *ha->tgt.qla_tgt is NULL\n");
                        return -ENODEV;
                }
                atomic_set(&tpg->lport_tpg_enabled, 0);
                qlt_stop_phase1(ha->tgt.qla_tgt);
        }

        return count;
}

TF_TPG_BASE_ATTR(tcm_qla2xxx, enable, S_IRUGO | S_IWUSR);

static struct configfs_attribute *tcm_qla2xxx_tpg_attrs[] = {
        &tcm_qla2xxx_tpg_enable.attr,
        NULL,
};

static struct se_portal_group *tcm_qla2xxx_make_tpg(
        struct se_wwn *wwn,
        struct config_group *group,
        const char *name)
{
        struct tcm_qla2xxx_lport *lport = container_of(wwn,
                        struct tcm_qla2xxx_lport, lport_wwn);
        struct tcm_qla2xxx_tpg *tpg;
        unsigned long tpgt;
        int ret;

        if (strstr(name, "tpgt_") != name)
                return ERR_PTR(-EINVAL);
        if (kstrtoul(name + 5, 10, &tpgt) || tpgt > USHRT_MAX)
                return ERR_PTR(-EINVAL);

        if (!lport->qla_npiv_vp && (tpgt != 1)) {
                pr_err("In non NPIV mode, a single TPG=1 is used for HW port mappings\n");
                return ERR_PTR(-ENOSYS);
        }

        tpg = kzalloc(sizeof(struct tcm_qla2xxx_tpg), GFP_KERNEL);
        if (!tpg) {
                pr_err("Unable to allocate struct tcm_qla2xxx_tpg\n");
                return ERR_PTR(-ENOMEM);
        }
        tpg->lport = lport;
        tpg->lport_tpgt = tpgt;
        /*
         * By default allow READ-ONLY TPG demo-mode access w/ cached dynamic
         * NodeACLs
         */
        QLA_TPG_ATTRIB(tpg)->generate_node_acls = 1;
        QLA_TPG_ATTRIB(tpg)->demo_mode_write_protect = 1;
        QLA_TPG_ATTRIB(tpg)->cache_dynamic_acls = 1;

        ret = core_tpg_register(&tcm_qla2xxx_fabric_configfs->tf_ops, wwn,
                                &tpg->se_tpg, tpg, TRANSPORT_TPG_TYPE_NORMAL);
        if (ret < 0) {
                kfree(tpg);
                return NULL;
        }
        /*
         * Setup local TPG=1 pointer for non NPIV mode.
         */
        if (lport->qla_npiv_vp == NULL)
                lport->tpg_1 = tpg;

        return &tpg->se_tpg;
}

static void tcm_qla2xxx_drop_tpg(struct se_portal_group *se_tpg)
{
        struct tcm_qla2xxx_tpg *tpg = container_of(se_tpg,
                        struct tcm_qla2xxx_tpg, se_tpg);
        struct tcm_qla2xxx_lport *lport = tpg->lport;
        struct scsi_qla_host *vha = lport->qla_vha;
        struct qla_hw_data *ha = vha->hw;
        /*
         * Call into qla2x_target.c LLD logic to shutdown the active
         * FC Nexuses and disable target mode operation for this qla_hw_data
         */
        if (ha->tgt.qla_tgt && !ha->tgt.qla_tgt->tgt_stop)
                qlt_stop_phase1(ha->tgt.qla_tgt);

        core_tpg_deregister(se_tpg);
        /*
         * Clear local TPG=1 pointer for non NPIV mode.
         */
        if (lport->qla_npiv_vp == NULL)
                lport->tpg_1 = NULL;

        kfree(tpg);
}

static struct se_portal_group *tcm_qla2xxx_npiv_make_tpg(
        struct se_wwn *wwn,
        struct config_group *group,
        const char *name)
{
        struct tcm_qla2xxx_lport *lport = container_of(wwn,
                        struct tcm_qla2xxx_lport, lport_wwn);
        struct tcm_qla2xxx_tpg *tpg;
        unsigned long tpgt;
        int ret;

        if (strstr(name, "tpgt_") != name)
                return ERR_PTR(-EINVAL);
        if (kstrtoul(name + 5, 10, &tpgt) || tpgt > USHRT_MAX)
                return ERR_PTR(-EINVAL);

        tpg = kzalloc(sizeof(struct tcm_qla2xxx_tpg), GFP_KERNEL);
        if (!tpg) {
                pr_err("Unable to allocate struct tcm_qla2xxx_tpg\n");
                return ERR_PTR(-ENOMEM);
        }
        tpg->lport = lport;
        tpg->lport_tpgt = tpgt;

        ret = core_tpg_register(&tcm_qla2xxx_npiv_fabric_configfs->tf_ops, wwn,
                                &tpg->se_tpg, tpg, TRANSPORT_TPG_TYPE_NORMAL);
        if (ret < 0) {
                kfree(tpg);
                return NULL;
        }
        return &tpg->se_tpg;
}

/*
 * Expected to be called with struct qla_hw_data->hardware_lock held
 */
static struct qla_tgt_sess *tcm_qla2xxx_find_sess_by_s_id(
        scsi_qla_host_t *vha,
        const uint8_t *s_id)
{
        struct qla_hw_data *ha = vha->hw;
        struct tcm_qla2xxx_lport *lport;
        struct se_node_acl *se_nacl;
        struct tcm_qla2xxx_nacl *nacl;
        u32 key;

        lport = ha->tgt.target_lport_ptr;
        if (!lport) {
                pr_err("Unable to locate struct tcm_qla2xxx_lport\n");
                dump_stack();
                return NULL;
        }

        key = (((unsigned long)s_id[0] << 16) |
               ((unsigned long)s_id[1] << 8) |
               (unsigned long)s_id[2]);
        pr_debug("find_sess_by_s_id: 0x%06x\n", key);

        se_nacl = btree_lookup32(&lport->lport_fcport_map, key);
        if (!se_nacl) {
                pr_debug("Unable to locate s_id: 0x%06x\n", key);
                return NULL;
        }
        pr_debug("find_sess_by_s_id: located se_nacl: %p, initiatorname: %s\n",
            se_nacl, se_nacl->initiatorname);

        nacl = container_of(se_nacl, struct tcm_qla2xxx_nacl, se_node_acl);
        if (!nacl->qla_tgt_sess) {
                pr_err("Unable to locate struct qla_tgt_sess\n");
                return NULL;
        }

        return nacl->qla_tgt_sess;
}

/*
 * Expected to be called with struct qla_hw_data->hardware_lock held
 */
static void tcm_qla2xxx_set_sess_by_s_id(
        struct tcm_qla2xxx_lport *lport,
        struct se_node_acl *new_se_nacl,
        struct tcm_qla2xxx_nacl *nacl,
        struct se_session *se_sess,
        struct qla_tgt_sess *qla_tgt_sess,
        uint8_t *s_id)
{
        u32 key;
        void *slot;
        int rc;

        key = (((unsigned long)s_id[0] << 16) |
               ((unsigned long)s_id[1] << 8) |
               (unsigned long)s_id[2]);
        pr_debug("set_sess_by_s_id: %06x\n", key);

        slot = btree_lookup32(&lport->lport_fcport_map, key);
        if (!slot) {
                if (new_se_nacl) {
                        pr_debug("Setting up new fc_port entry to new_se_nacl\n");
                        nacl->nport_id = key;
                        rc = btree_insert32(&lport->lport_fcport_map, key,
                                        new_se_nacl, GFP_ATOMIC);
                        if (rc)
                                printk(KERN_ERR "Unable to insert s_id into fcport_map: %06x\n",
                                    (int)key);
                } else {
                        pr_debug("Wiping nonexisting fc_port entry\n");
                }

                qla_tgt_sess->se_sess = se_sess;
                nacl->qla_tgt_sess = qla_tgt_sess;
                return;
        }

        if (nacl->qla_tgt_sess) {
                if (new_se_nacl == NULL) {
                        pr_debug("Clearing existing nacl->qla_tgt_sess and fc_port entry\n");
                        btree_remove32(&lport->lport_fcport_map, key);
                        nacl->qla_tgt_sess = NULL;
                        return;
                }
                pr_debug("Replacing existing nacl->qla_tgt_sess and fc_port entry\n");
                btree_update32(&lport->lport_fcport_map, key, new_se_nacl);
                qla_tgt_sess->se_sess = se_sess;
                nacl->qla_tgt_sess = qla_tgt_sess;
                return;
        }

        if (new_se_nacl == NULL) {
                pr_debug("Clearing existing fc_port entry\n");
                btree_remove32(&lport->lport_fcport_map, key);
                return;
        }

        pr_debug("Replacing existing fc_port entry w/o active nacl->qla_tgt_sess\n");
        btree_update32(&lport->lport_fcport_map, key, new_se_nacl);
        qla_tgt_sess->se_sess = se_sess;
        nacl->qla_tgt_sess = qla_tgt_sess;

        pr_debug("Setup nacl->qla_tgt_sess %p by s_id for se_nacl: %p, initiatorname: %s\n",
            nacl->qla_tgt_sess, new_se_nacl, new_se_nacl->initiatorname);
}

/*
 * Expected to be called with struct qla_hw_data->hardware_lock held
 */
static struct qla_tgt_sess *tcm_qla2xxx_find_sess_by_loop_id(
        scsi_qla_host_t *vha,
        const uint16_t loop_id)
{
        struct qla_hw_data *ha = vha->hw;
        struct tcm_qla2xxx_lport *lport;
        struct se_node_acl *se_nacl;
        struct tcm_qla2xxx_nacl *nacl;
        struct tcm_qla2xxx_fc_loopid *fc_loopid;

        lport = ha->tgt.target_lport_ptr;
        if (!lport) {
                pr_err("Unable to locate struct tcm_qla2xxx_lport\n");
                dump_stack();
                return NULL;
        }

        pr_debug("find_sess_by_loop_id: Using loop_id: 0x%04x\n", loop_id);

        fc_loopid = lport->lport_loopid_map + loop_id;
        se_nacl = fc_loopid->se_nacl;
        if (!se_nacl) {
                pr_debug("Unable to locate se_nacl by loop_id: 0x%04x\n",
                    loop_id);
                return NULL;
        }

        nacl = container_of(se_nacl, struct tcm_qla2xxx_nacl, se_node_acl);

        if (!nacl->qla_tgt_sess) {
                pr_err("Unable to locate struct qla_tgt_sess\n");
                return NULL;
        }

        return nacl->qla_tgt_sess;
}

/*
 * Expected to be called with struct qla_hw_data->hardware_lock held
 */
static void tcm_qla2xxx_set_sess_by_loop_id(
        struct tcm_qla2xxx_lport *lport,
        struct se_node_acl *new_se_nacl,
        struct tcm_qla2xxx_nacl *nacl,
        struct se_session *se_sess,
        struct qla_tgt_sess *qla_tgt_sess,
        uint16_t loop_id)
{
        struct se_node_acl *saved_nacl;
        struct tcm_qla2xxx_fc_loopid *fc_loopid;

        pr_debug("set_sess_by_loop_id: Using loop_id: 0x%04x\n", loop_id);

        fc_loopid = &((struct tcm_qla2xxx_fc_loopid *)
                        lport->lport_loopid_map)[loop_id];

        saved_nacl = fc_loopid->se_nacl;
        if (!saved_nacl) {
                pr_debug("Setting up new fc_loopid->se_nacl to new_se_nacl\n");
                fc_loopid->se_nacl = new_se_nacl;
                if (qla_tgt_sess->se_sess != se_sess)
                        qla_tgt_sess->se_sess = se_sess;
                if (nacl->qla_tgt_sess != qla_tgt_sess)
                        nacl->qla_tgt_sess = qla_tgt_sess;
                return;
        }

        if (nacl->qla_tgt_sess) {
                if (new_se_nacl == NULL) {
                        pr_debug("Clearing nacl->qla_tgt_sess and fc_loopid->se_nacl\n");
                        fc_loopid->se_nacl = NULL;
                        nacl->qla_tgt_sess = NULL;
                        return;
                }

                pr_debug("Replacing existing nacl->qla_tgt_sess and fc_loopid->se_nacl\n");
                fc_loopid->se_nacl = new_se_nacl;
                if (qla_tgt_sess->se_sess != se_sess)
                        qla_tgt_sess->se_sess = se_sess;
                if (nacl->qla_tgt_sess != qla_tgt_sess)
                        nacl->qla_tgt_sess = qla_tgt_sess;
                return;
        }

        if (new_se_nacl == NULL) {
                pr_debug("Clearing fc_loopid->se_nacl\n");
                fc_loopid->se_nacl = NULL;
                return;
        }

        pr_debug("Replacing existing fc_loopid->se_nacl w/o active nacl->qla_tgt_sess\n");
        fc_loopid->se_nacl = new_se_nacl;
        if (qla_tgt_sess->se_sess != se_sess)
                qla_tgt_sess->se_sess = se_sess;
        if (nacl->qla_tgt_sess != qla_tgt_sess)
                nacl->qla_tgt_sess = qla_tgt_sess;

        pr_debug("Setup nacl->qla_tgt_sess %p by loop_id for se_nacl: %p, initiatorname: %s\n",
            nacl->qla_tgt_sess, new_se_nacl, new_se_nacl->initiatorname);
}

/*
 * Should always be called with qla_hw_data->hardware_lock held.
 */
static void tcm_qla2xxx_clear_sess_lookup(struct tcm_qla2xxx_lport *lport,
                struct tcm_qla2xxx_nacl *nacl, struct qla_tgt_sess *sess)
{
        struct se_session *se_sess = sess->se_sess;
        unsigned char be_sid[3];

        be_sid[0] = sess->s_id.b.domain;
        be_sid[1] = sess->s_id.b.area;
        be_sid[2] = sess->s_id.b.al_pa;

        tcm_qla2xxx_set_sess_by_s_id(lport, NULL, nacl, se_sess,
                                sess, be_sid);
        tcm_qla2xxx_set_sess_by_loop_id(lport, NULL, nacl, se_sess,
                                sess, sess->loop_id);
}

static void tcm_qla2xxx_free_session(struct qla_tgt_sess *sess)
{
        struct qla_tgt *tgt = sess->tgt;
        struct qla_hw_data *ha = tgt->ha;
        struct se_session *se_sess;
        struct se_node_acl *se_nacl;
        struct tcm_qla2xxx_lport *lport;
        struct tcm_qla2xxx_nacl *nacl;

        BUG_ON(in_interrupt());

        se_sess = sess->se_sess;
        if (!se_sess) {
                pr_err("struct qla_tgt_sess->se_sess is NULL\n");
                dump_stack();
                return;
        }
        se_nacl = se_sess->se_node_acl;
        nacl = container_of(se_nacl, struct tcm_qla2xxx_nacl, se_node_acl);

        lport = ha->tgt.target_lport_ptr;
        if (!lport) {
                pr_err("Unable to locate struct tcm_qla2xxx_lport\n");
                dump_stack();
                return;
        }
        target_wait_for_sess_cmds(se_sess, 0);

        transport_deregister_session_configfs(sess->se_sess);
        transport_deregister_session(sess->se_sess);
}

/*
 * Called via qlt_create_sess():ha->qla2x_tmpl->check_initiator_node_acl()
 * to locate struct se_node_acl
 */
static int tcm_qla2xxx_check_initiator_node_acl(
        scsi_qla_host_t *vha,
        unsigned char *fc_wwpn,
        void *qla_tgt_sess,
        uint8_t *s_id,
        uint16_t loop_id)
{
        struct qla_hw_data *ha = vha->hw;
        struct tcm_qla2xxx_lport *lport;
        struct tcm_qla2xxx_tpg *tpg;
        struct tcm_qla2xxx_nacl *nacl;
        struct se_portal_group *se_tpg;
        struct se_node_acl *se_nacl;
        struct se_session *se_sess;
        struct qla_tgt_sess *sess = qla_tgt_sess;
        unsigned char port_name[36];
        unsigned long flags;

        lport = ha->tgt.target_lport_ptr;
        if (!lport) {
                pr_err("Unable to locate struct tcm_qla2xxx_lport\n");
                dump_stack();
                return -EINVAL;
        }
        /*
         * Locate the TPG=1 reference..
         */
        tpg = lport->tpg_1;
        if (!tpg) {
                pr_err("Unable to lcoate struct tcm_qla2xxx_lport->tpg_1\n");
                return -EINVAL;
        }
        se_tpg = &tpg->se_tpg;

        se_sess = transport_init_session();
        if (IS_ERR(se_sess)) {
                pr_err("Unable to initialize struct se_session\n");
                return PTR_ERR(se_sess);
        }
        /*
         * Format the FCP Initiator port_name into colon seperated values to
         * match the format by tcm_qla2xxx explict ConfigFS NodeACLs.
         */
        memset(&port_name, 0, 36);
        snprintf(port_name, 36, "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x",
                fc_wwpn[0], fc_wwpn[1], fc_wwpn[2], fc_wwpn[3], fc_wwpn[4],
                fc_wwpn[5], fc_wwpn[6], fc_wwpn[7]);
        /*
         * Locate our struct se_node_acl either from an explict NodeACL created
         * via ConfigFS, or via running in TPG demo mode.
         */
        se_sess->se_node_acl = core_tpg_check_initiator_node_acl(se_tpg,
                                        port_name);
        if (!se_sess->se_node_acl) {
                transport_free_session(se_sess);
                return -EINVAL;
        }
        se_nacl = se_sess->se_node_acl;
        nacl = container_of(se_nacl, struct tcm_qla2xxx_nacl, se_node_acl);
        /*
         * And now setup the new se_nacl and session pointers into our HW lport
         * mappings for fabric S_ID and LOOP_ID.
         */
        spin_lock_irqsave(&ha->hardware_lock, flags);
        tcm_qla2xxx_set_sess_by_s_id(lport, se_nacl, nacl, se_sess,
                        qla_tgt_sess, s_id);
        tcm_qla2xxx_set_sess_by_loop_id(lport, se_nacl, nacl, se_sess,
                        qla_tgt_sess, loop_id);
        spin_unlock_irqrestore(&ha->hardware_lock, flags);
        /*
         * Finally register the new FC Nexus with TCM
         */
        __transport_register_session(se_nacl->se_tpg, se_nacl, se_sess, sess);

        return 0;
}

/*
 * Calls into tcm_qla2xxx used by qla2xxx LLD I/O path.
 */
static struct qla_tgt_func_tmpl tcm_qla2xxx_template = {
        .handle_cmd             = tcm_qla2xxx_handle_cmd,
        .handle_data            = tcm_qla2xxx_handle_data,
        .handle_tmr             = tcm_qla2xxx_handle_tmr,
        .free_cmd               = tcm_qla2xxx_free_cmd,
        .free_mcmd              = tcm_qla2xxx_free_mcmd,
        .free_session           = tcm_qla2xxx_free_session,
        .check_initiator_node_acl = tcm_qla2xxx_check_initiator_node_acl,
        .find_sess_by_s_id      = tcm_qla2xxx_find_sess_by_s_id,
        .find_sess_by_loop_id   = tcm_qla2xxx_find_sess_by_loop_id,
        .clear_nacl_from_fcport_map = tcm_qla2xxx_clear_nacl_from_fcport_map,
        .put_sess               = tcm_qla2xxx_put_sess,
        .shutdown_sess          = tcm_qla2xxx_shutdown_sess,
};

static int tcm_qla2xxx_init_lport(struct tcm_qla2xxx_lport *lport)
{
        int rc;

        rc = btree_init32(&lport->lport_fcport_map);
        if (rc) {
                pr_err("Unable to initialize lport->lport_fcport_map btree\n");
                return rc;
        }

        lport->lport_loopid_map = vmalloc(sizeof(struct tcm_qla2xxx_fc_loopid) *
                                65536);
        if (!lport->lport_loopid_map) {
                pr_err("Unable to allocate lport->lport_loopid_map of %zu bytes\n",
                    sizeof(struct tcm_qla2xxx_fc_loopid) * 65536);
                btree_destroy32(&lport->lport_fcport_map);
                return -ENOMEM;
        }
        memset(lport->lport_loopid_map, 0, sizeof(struct tcm_qla2xxx_fc_loopid)
               * 65536);
        pr_debug("qla2xxx: Allocated lport_loopid_map of %zu bytes\n",
               sizeof(struct tcm_qla2xxx_fc_loopid) * 65536);
        return 0;
}

static int tcm_qla2xxx_lport_register_cb(struct scsi_qla_host *vha)
{
        struct qla_hw_data *ha = vha->hw;
        struct tcm_qla2xxx_lport *lport;
        /*
         * Setup local pointer to vha, NPIV VP pointer (if present) and
         * vha->tcm_lport pointer
         */
        lport = (struct tcm_qla2xxx_lport *)ha->tgt.target_lport_ptr;
        lport->qla_vha = vha;

        return 0;
}

static struct se_wwn *tcm_qla2xxx_make_lport(
        struct target_fabric_configfs *tf,
        struct config_group *group,
        const char *name)
{
        struct tcm_qla2xxx_lport *lport;
        u64 wwpn;
        int ret = -ENODEV;

        if (tcm_qla2xxx_parse_wwn(name, &wwpn, 1) < 0)
                return ERR_PTR(-EINVAL);

        lport = kzalloc(sizeof(struct tcm_qla2xxx_lport), GFP_KERNEL);
        if (!lport) {
                pr_err("Unable to allocate struct tcm_qla2xxx_lport\n");
                return ERR_PTR(-ENOMEM);
        }
        lport->lport_wwpn = wwpn;
        tcm_qla2xxx_format_wwn(&lport->lport_name[0], TCM_QLA2XXX_NAMELEN,
                                wwpn);

        ret = tcm_qla2xxx_init_lport(lport);
        if (ret != 0)
                goto out;

        ret = qlt_lport_register(&tcm_qla2xxx_template, wwpn,
                                tcm_qla2xxx_lport_register_cb, lport);
        if (ret != 0)
                goto out_lport;

        return &lport->lport_wwn;
out_lport:
        vfree(lport->lport_loopid_map);
        btree_destroy32(&lport->lport_fcport_map);
out:
        kfree(lport);
        return ERR_PTR(ret);
}

static void tcm_qla2xxx_drop_lport(struct se_wwn *wwn)
{
        struct tcm_qla2xxx_lport *lport = container_of(wwn,
                        struct tcm_qla2xxx_lport, lport_wwn);
        struct scsi_qla_host *vha = lport->qla_vha;
        struct qla_hw_data *ha = vha->hw;
        struct se_node_acl *node;
        u32 key = 0;

        /*
         * Call into qla2x_target.c LLD logic to complete the
         * shutdown of struct qla_tgt after the call to
         * qlt_stop_phase1() from tcm_qla2xxx_drop_tpg() above..
         */
        if (ha->tgt.qla_tgt && !ha->tgt.qla_tgt->tgt_stopped)
                qlt_stop_phase2(ha->tgt.qla_tgt);

        qlt_lport_deregister(vha);

        vfree(lport->lport_loopid_map);
        btree_for_each_safe32(&lport->lport_fcport_map, key, node)
                btree_remove32(&lport->lport_fcport_map, key);
        btree_destroy32(&lport->lport_fcport_map);
        kfree(lport);
}

static struct se_wwn *tcm_qla2xxx_npiv_make_lport(
        struct target_fabric_configfs *tf,
        struct config_group *group,
        const char *name)
{
        struct tcm_qla2xxx_lport *lport;
        u64 npiv_wwpn, npiv_wwnn;
        int ret;

        if (tcm_qla2xxx_npiv_parse_wwn(name, strlen(name)+1,
                                &npiv_wwpn, &npiv_wwnn) < 0)
                return ERR_PTR(-EINVAL);

        lport = kzalloc(sizeof(struct tcm_qla2xxx_lport), GFP_KERNEL);
        if (!lport) {
                pr_err("Unable to allocate struct tcm_qla2xxx_lport for NPIV\n");
                return ERR_PTR(-ENOMEM);
        }
        lport->lport_npiv_wwpn = npiv_wwpn;
        lport->lport_npiv_wwnn = npiv_wwnn;
        tcm_qla2xxx_npiv_format_wwn(&lport->lport_npiv_name[0],
                        TCM_QLA2XXX_NAMELEN, npiv_wwpn, npiv_wwnn);

/* FIXME: tcm_qla2xxx_npiv_make_lport */
        ret = -ENOSYS;
        if (ret != 0)
                goto out;

        return &lport->lport_wwn;
out:
        kfree(lport);
        return ERR_PTR(ret);
}

static void tcm_qla2xxx_npiv_drop_lport(struct se_wwn *wwn)
{
        struct tcm_qla2xxx_lport *lport = container_of(wwn,
                        struct tcm_qla2xxx_lport, lport_wwn);
        struct scsi_qla_host *vha = lport->qla_vha;
        struct Scsi_Host *sh = vha->host;
        /*
         * Notify libfc that we want to release the lport->npiv_vport
         */
        fc_vport_terminate(lport->npiv_vport);

        scsi_host_put(sh);
        kfree(lport);
}


static ssize_t tcm_qla2xxx_wwn_show_attr_version(
        struct target_fabric_configfs *tf,
        char *page)
{
        return sprintf(page,
            "TCM QLOGIC QLA2XXX NPIV capable fabric module %s on %s/%s on "
            UTS_RELEASE"\n", TCM_QLA2XXX_VERSION, utsname()->sysname,
            utsname()->machine);
}

TF_WWN_ATTR_RO(tcm_qla2xxx, version);

static struct configfs_attribute *tcm_qla2xxx_wwn_attrs[] = {
        &tcm_qla2xxx_wwn_version.attr,
        NULL,
};

static struct target_core_fabric_ops tcm_qla2xxx_ops = {
        .get_fabric_name                = tcm_qla2xxx_get_fabric_name,
        .get_fabric_proto_ident         = tcm_qla2xxx_get_fabric_proto_ident,
        .tpg_get_wwn                    = tcm_qla2xxx_get_fabric_wwn,
        .tpg_get_tag                    = tcm_qla2xxx_get_tag,
        .tpg_get_default_depth          = tcm_qla2xxx_get_default_depth,
        .tpg_get_pr_transport_id        = tcm_qla2xxx_get_pr_transport_id,
        .tpg_get_pr_transport_id_len    = tcm_qla2xxx_get_pr_transport_id_len,
        .tpg_parse_pr_out_transport_id  = tcm_qla2xxx_parse_pr_out_transport_id,
        .tpg_check_demo_mode            = tcm_qla2xxx_check_demo_mode,
        .tpg_check_demo_mode_cache      = tcm_qla2xxx_check_demo_mode_cache,
        .tpg_check_demo_mode_write_protect =
                                        tcm_qla2xxx_check_demo_write_protect,
        .tpg_check_prod_mode_write_protect =
                                        tcm_qla2xxx_check_prod_write_protect,
        .tpg_check_demo_mode_login_only = tcm_qla2xxx_check_true,
        .tpg_alloc_fabric_acl           = tcm_qla2xxx_alloc_fabric_acl,
        .tpg_release_fabric_acl         = tcm_qla2xxx_release_fabric_acl,
        .tpg_get_inst_index             = tcm_qla2xxx_tpg_get_inst_index,
        .check_stop_free                = tcm_qla2xxx_check_stop_free,
        .release_cmd                    = tcm_qla2xxx_release_cmd,
        .put_session                    = tcm_qla2xxx_put_session,
        .shutdown_session               = tcm_qla2xxx_shutdown_session,
        .close_session                  = tcm_qla2xxx_close_session,
        .sess_get_index                 = tcm_qla2xxx_sess_get_index,
        .sess_get_initiator_sid         = NULL,
        .write_pending                  = tcm_qla2xxx_write_pending,
        .write_pending_status           = tcm_qla2xxx_write_pending_status,
        .set_default_node_attributes    = tcm_qla2xxx_set_default_node_attrs,
        .get_task_tag                   = tcm_qla2xxx_get_task_tag,
        .get_cmd_state                  = tcm_qla2xxx_get_cmd_state,
        .queue_data_in                  = tcm_qla2xxx_queue_data_in,
        .queue_status                   = tcm_qla2xxx_queue_status,
        .queue_tm_rsp                   = tcm_qla2xxx_queue_tm_rsp,
        .get_fabric_sense_len           = tcm_qla2xxx_get_fabric_sense_len,
        .set_fabric_sense_len           = tcm_qla2xxx_set_fabric_sense_len,
        /*
         * Setup function pointers for generic logic in
         * target_core_fabric_configfs.c
         */
        .fabric_make_wwn                = tcm_qla2xxx_make_lport,
        .fabric_drop_wwn                = tcm_qla2xxx_drop_lport,
        .fabric_make_tpg                = tcm_qla2xxx_make_tpg,
        .fabric_drop_tpg                = tcm_qla2xxx_drop_tpg,
        .fabric_post_link               = NULL,
        .fabric_pre_unlink              = NULL,
        .fabric_make_np                 = NULL,
        .fabric_drop_np                 = NULL,
        .fabric_make_nodeacl            = tcm_qla2xxx_make_nodeacl,
        .fabric_drop_nodeacl            = tcm_qla2xxx_drop_nodeacl,
};

static struct target_core_fabric_ops tcm_qla2xxx_npiv_ops = {
        .get_fabric_name                = tcm_qla2xxx_npiv_get_fabric_name,
        .get_fabric_proto_ident         = tcm_qla2xxx_get_fabric_proto_ident,
        .tpg_get_wwn                    = tcm_qla2xxx_npiv_get_fabric_wwn,
        .tpg_get_tag                    = tcm_qla2xxx_get_tag,
        .tpg_get_default_depth          = tcm_qla2xxx_get_default_depth,
        .tpg_get_pr_transport_id        = tcm_qla2xxx_get_pr_transport_id,
        .tpg_get_pr_transport_id_len    = tcm_qla2xxx_get_pr_transport_id_len,
        .tpg_parse_pr_out_transport_id  = tcm_qla2xxx_parse_pr_out_transport_id,
        .tpg_check_demo_mode            = tcm_qla2xxx_check_false,
        .tpg_check_demo_mode_cache      = tcm_qla2xxx_check_true,
        .tpg_check_demo_mode_write_protect = tcm_qla2xxx_check_true,
        .tpg_check_prod_mode_write_protect = tcm_qla2xxx_check_false,
        .tpg_check_demo_mode_login_only = tcm_qla2xxx_check_true,
        .tpg_alloc_fabric_acl           = tcm_qla2xxx_alloc_fabric_acl,
        .tpg_release_fabric_acl         = tcm_qla2xxx_release_fabric_acl,
        .tpg_get_inst_index             = tcm_qla2xxx_tpg_get_inst_index,
        .release_cmd                    = tcm_qla2xxx_release_cmd,
        .put_session                    = tcm_qla2xxx_put_session,
        .shutdown_session               = tcm_qla2xxx_shutdown_session,
        .close_session                  = tcm_qla2xxx_close_session,
        .sess_get_index                 = tcm_qla2xxx_sess_get_index,
        .sess_get_initiator_sid         = NULL,
        .write_pending                  = tcm_qla2xxx_write_pending,
        .write_pending_status           = tcm_qla2xxx_write_pending_status,
        .set_default_node_attributes    = tcm_qla2xxx_set_default_node_attrs,
        .get_task_tag                   = tcm_qla2xxx_get_task_tag,
        .get_cmd_state                  = tcm_qla2xxx_get_cmd_state,
        .queue_data_in                  = tcm_qla2xxx_queue_data_in,
        .queue_status                   = tcm_qla2xxx_queue_status,
        .queue_tm_rsp                   = tcm_qla2xxx_queue_tm_rsp,
        .get_fabric_sense_len           = tcm_qla2xxx_get_fabric_sense_len,
        .set_fabric_sense_len           = tcm_qla2xxx_set_fabric_sense_len,
        /*
         * Setup function pointers for generic logic in
         * target_core_fabric_configfs.c
         */
        .fabric_make_wwn                = tcm_qla2xxx_npiv_make_lport,
        .fabric_drop_wwn                = tcm_qla2xxx_npiv_drop_lport,
        .fabric_make_tpg                = tcm_qla2xxx_npiv_make_tpg,
        .fabric_drop_tpg                = tcm_qla2xxx_drop_tpg,
        .fabric_post_link               = NULL,
        .fabric_pre_unlink              = NULL,
        .fabric_make_np                 = NULL,
        .fabric_drop_np                 = NULL,
        .fabric_make_nodeacl            = tcm_qla2xxx_make_nodeacl,
        .fabric_drop_nodeacl            = tcm_qla2xxx_drop_nodeacl,
};

static int tcm_qla2xxx_register_configfs(void)
{
        struct target_fabric_configfs *fabric, *npiv_fabric;
        int ret;

        pr_debug("TCM QLOGIC QLA2XXX fabric module %s on %s/%s on "
            UTS_RELEASE"\n", TCM_QLA2XXX_VERSION, utsname()->sysname,
            utsname()->machine);
        /*
         * Register the top level struct config_item_type with TCM core
         */
        fabric = target_fabric_configfs_init(THIS_MODULE, "qla2xxx");
        if (IS_ERR(fabric)) {
                pr_err("target_fabric_configfs_init() failed\n");
                return PTR_ERR(fabric);
        }
        /*
         * Setup fabric->tf_ops from our local tcm_qla2xxx_ops
         */
        fabric->tf_ops = tcm_qla2xxx_ops;
        /*
         * Setup default attribute lists for various fabric->tf_cit_tmpl
         */
        TF_CIT_TMPL(fabric)->tfc_wwn_cit.ct_attrs = tcm_qla2xxx_wwn_attrs;
        TF_CIT_TMPL(fabric)->tfc_tpg_base_cit.ct_attrs = tcm_qla2xxx_tpg_attrs;
        TF_CIT_TMPL(fabric)->tfc_tpg_attrib_cit.ct_attrs =
                                                tcm_qla2xxx_tpg_attrib_attrs;
        TF_CIT_TMPL(fabric)->tfc_tpg_param_cit.ct_attrs = NULL;
        TF_CIT_TMPL(fabric)->tfc_tpg_np_base_cit.ct_attrs = NULL;
        TF_CIT_TMPL(fabric)->tfc_tpg_nacl_base_cit.ct_attrs = NULL;
        TF_CIT_TMPL(fabric)->tfc_tpg_nacl_attrib_cit.ct_attrs = NULL;
        TF_CIT_TMPL(fabric)->tfc_tpg_nacl_auth_cit.ct_attrs = NULL;
        TF_CIT_TMPL(fabric)->tfc_tpg_nacl_param_cit.ct_attrs = NULL;
        /*
         * Register the fabric for use within TCM
         */
        ret = target_fabric_configfs_register(fabric);
        if (ret < 0) {
                pr_err("target_fabric_configfs_register() failed for TCM_QLA2XXX\n");
                return ret;
        }
        /*
         * Setup our local pointer to *fabric
         */
        tcm_qla2xxx_fabric_configfs = fabric;
        pr_debug("TCM_QLA2XXX[0] - Set fabric -> tcm_qla2xxx_fabric_configfs\n");

        /*
         * Register the top level struct config_item_type for NPIV with TCM core
         */
        npiv_fabric = target_fabric_configfs_init(THIS_MODULE, "qla2xxx_npiv");
        if (IS_ERR(npiv_fabric)) {
                pr_err("target_fabric_configfs_init() failed\n");
                ret = PTR_ERR(npiv_fabric);
                goto out_fabric;
        }
        /*
         * Setup fabric->tf_ops from our local tcm_qla2xxx_npiv_ops
         */
        npiv_fabric->tf_ops = tcm_qla2xxx_npiv_ops;
        /*
         * Setup default attribute lists for various npiv_fabric->tf_cit_tmpl
         */
        TF_CIT_TMPL(npiv_fabric)->tfc_wwn_cit.ct_attrs = tcm_qla2xxx_wwn_attrs;
        TF_CIT_TMPL(npiv_fabric)->tfc_tpg_base_cit.ct_attrs = NULL;
        TF_CIT_TMPL(npiv_fabric)->tfc_tpg_attrib_cit.ct_attrs = NULL;
        TF_CIT_TMPL(npiv_fabric)->tfc_tpg_param_cit.ct_attrs = NULL;
        TF_CIT_TMPL(npiv_fabric)->tfc_tpg_np_base_cit.ct_attrs = NULL;
        TF_CIT_TMPL(npiv_fabric)->tfc_tpg_nacl_base_cit.ct_attrs = NULL;
        TF_CIT_TMPL(npiv_fabric)->tfc_tpg_nacl_attrib_cit.ct_attrs = NULL;
        TF_CIT_TMPL(npiv_fabric)->tfc_tpg_nacl_auth_cit.ct_attrs = NULL;
        TF_CIT_TMPL(npiv_fabric)->tfc_tpg_nacl_param_cit.ct_attrs = NULL;
        /*
         * Register the npiv_fabric for use within TCM
         */
        ret = target_fabric_configfs_register(npiv_fabric);
        if (ret < 0) {
                pr_err("target_fabric_configfs_register() failed for TCM_QLA2XXX\n");
                goto out_fabric;
        }
        /*
         * Setup our local pointer to *npiv_fabric
         */
        tcm_qla2xxx_npiv_fabric_configfs = npiv_fabric;
        pr_debug("TCM_QLA2XXX[0] - Set fabric -> tcm_qla2xxx_npiv_fabric_configfs\n");

        tcm_qla2xxx_free_wq = alloc_workqueue("tcm_qla2xxx_free",
                                                WQ_MEM_RECLAIM, 0);
        if (!tcm_qla2xxx_free_wq) {
                ret = -ENOMEM;
                goto out_fabric_npiv;
        }

        tcm_qla2xxx_cmd_wq = alloc_workqueue("tcm_qla2xxx_cmd", 0, 0);
        if (!tcm_qla2xxx_cmd_wq) {
                ret = -ENOMEM;
                goto out_free_wq;
        }

        return 0;

out_free_wq:
        destroy_workqueue(tcm_qla2xxx_free_wq);
out_fabric_npiv:
        target_fabric_configfs_deregister(tcm_qla2xxx_npiv_fabric_configfs);
out_fabric:
        target_fabric_configfs_deregister(tcm_qla2xxx_fabric_configfs);
        return ret;
}

static void tcm_qla2xxx_deregister_configfs(void)
{
        destroy_workqueue(tcm_qla2xxx_cmd_wq);
        destroy_workqueue(tcm_qla2xxx_free_wq);

        target_fabric_configfs_deregister(tcm_qla2xxx_fabric_configfs);
        tcm_qla2xxx_fabric_configfs = NULL;
        pr_debug("TCM_QLA2XXX[0] - Cleared tcm_qla2xxx_fabric_configfs\n");

        target_fabric_configfs_deregister(tcm_qla2xxx_npiv_fabric_configfs);
        tcm_qla2xxx_npiv_fabric_configfs = NULL;
        pr_debug("TCM_QLA2XXX[0] - Cleared tcm_qla2xxx_npiv_fabric_configfs\n");
}

static int __init tcm_qla2xxx_init(void)
{
        int ret;

        ret = tcm_qla2xxx_register_configfs();
        if (ret < 0)
                return ret;

        return 0;
}

static void __exit tcm_qla2xxx_exit(void)
{
        tcm_qla2xxx_deregister_configfs();
}

MODULE_DESCRIPTION("TCM QLA2XXX series NPIV enabled fabric driver");
MODULE_LICENSE("GPL");
module_init(tcm_qla2xxx_init);
module_exit(tcm_qla2xxx_exit);