Merge branch 'fixes' of git://ftp.arm.linux.org.uk/~rmk/linux-arm

[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
 *
 * (c) Copyright 2010-2013 Datera, Inc.
 *
 * Author: Nicholas A. Bellinger <nab@daterainc.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/vmalloc.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/configfs_macros.h>

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

static struct workqueue_struct *tcm_qla2xxx_free_wq;
static struct workqueue_struct *tcm_qla2xxx_cmd_wq;

/*
 * 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' || name[cnt-1] == 0)
                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 char *tcm_qla2xxx_npiv_get_fabric_name(void)
{
        return "qla2xxx_npiv";
}

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_naa_name;
}

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 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 tpg->tpg_attrib.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 tpg->tpg_attrib.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 tpg->tpg_attrib.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 tpg->tpg_attrib.prod_mode_write_protect;
}

static int tcm_qla2xxx_check_demo_mode_login_only(struct se_portal_group *se_tpg)
{
        struct tcm_qla2xxx_tpg *tpg = container_of(se_tpg,
                                struct tcm_qla2xxx_tpg, se_tpg);

        return tpg->tpg_attrib.demo_mode_login_only;
}

static int tcm_qla2xxx_check_prot_fabric_only(struct se_portal_group *se_tpg)
{
        struct tcm_qla2xxx_tpg *tpg = container_of(se_tpg,
                                struct tcm_qla2xxx_tpg, se_tpg);

        return tpg->tpg_attrib.fabric_prot_type;
}

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);

        cmd->cmd_in_wq = 0;

        WARN_ON(cmd->cmd_flags &  BIT_16);

        cmd->cmd_flags |= BIT_16;
        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)
{
        cmd->cmd_in_wq = 1;
        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)
{
        struct qla_tgt_cmd *cmd;

        if ((se_cmd->se_cmd_flags & SCF_SCSI_TMR_CDB) == 0) {
                cmd = container_of(se_cmd, struct qla_tgt_cmd, se_cmd);
                cmd->cmd_flags |= BIT_14;
        }

        return target_put_sess_cmd(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;
}

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->cmd_flags |= BIT_3;
        cmd->bufflen = se_cmd->data_length;
        cmd->dma_data_direction = target_reverse_dma_direction(se_cmd);

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

        cmd->prot_sg_cnt = se_cmd->t_prot_nents;
        cmd->prot_sg = se_cmd->t_prot_sg;
        cmd->blk_sz  = se_cmd->se_dev->dev_attrib.block_size;
        se_cmd->pi_err = 0;

        /*
         * 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,
                                            3 * HZ);
                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 int tcm_qla2xxx_get_cmd_state(struct se_cmd *se_cmd)
{
        if (!(se_cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
                struct qla_tgt_cmd *cmd = container_of(se_cmd,
                                struct qla_tgt_cmd, se_cmd);
                return cmd->state;
        }

        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.
         */
        cmd->cmd_in_wq = 0;
        cmd->cmd_flags |= BIT_11;
        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;
                }

                if (cmd->se_cmd.pi_err)
                        transport_generic_request_failure(&cmd->se_cmd,
                                cmd->se_cmd.pi_err);
                else
                        transport_generic_request_failure(&cmd->se_cmd,
                                TCM_CHECK_CONDITION_ABORT_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)
{
        cmd->cmd_flags |= BIT_10;
        cmd->cmd_in_wq = 1;
        INIT_WORK(&cmd->work, tcm_qla2xxx_handle_data_work);
        queue_work(tcm_qla2xxx_free_wq, &cmd->work);
}

static void tcm_qla2xxx_handle_dif_work(struct work_struct *work)
{
        struct qla_tgt_cmd *cmd = container_of(work, struct qla_tgt_cmd, work);

        /* take an extra kref to prevent cmd free too early.
         * need to wait for SCSI status/check condition to
         * finish responding generate by transport_generic_request_failure.
         */
        kref_get(&cmd->se_cmd.cmd_kref);
        transport_generic_request_failure(&cmd->se_cmd, cmd->se_cmd.pi_err);
}

/*
 * Called from qla_target.c:qlt_do_ctio_completion()
 */
static void tcm_qla2xxx_handle_dif_err(struct qla_tgt_cmd *cmd)
{
        INIT_WORK(&cmd->work, tcm_qla2xxx_handle_dif_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->cmd_flags |= BIT_4;
        cmd->bufflen = se_cmd->data_length;
        cmd->dma_data_direction = target_reverse_dma_direction(se_cmd);

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

        cmd->prot_sg_cnt = se_cmd->t_prot_nents;
        cmd->prot_sg = se_cmd->t_prot_sg;
        cmd->blk_sz  = se_cmd->se_dev->dev_attrib.block_size;
        se_cmd->pi_err = 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 = target_reverse_dma_direction(se_cmd);
        if (cmd->cmd_flags &  BIT_5) {
                pr_crit("Bit_5 already set for cmd = %p.\n", cmd);
                dump_stack();
        }
        cmd->cmd_flags |= BIT_5;

        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
                 */
                if (se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
                        se_cmd->se_cmd_flags &= ~SCF_OVERFLOW_BIT;
                        se_cmd->residual_count = 0;
                }
                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 void 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);
}

static void tcm_qla2xxx_aborted_task(struct se_cmd *se_cmd)
{
        struct qla_tgt_cmd *cmd = container_of(se_cmd,
                                struct qla_tgt_cmd, se_cmd);
        qlt_abort_cmd(cmd);
}

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);
        if (WARN_ON(node && (node != se_nacl))) {
                /*
                 * The nacl no longer matches what we think it should be.
                 * Most likely a new dynamic acl has been added while
                 * someone dropped the hardware lock.  It clearly is a
                 * bug elsewhere, but this bit can't make things worse.
                 */
                btree_insert32(&lport->lport_fcport_map, nacl->nport_id,
                               node, GFP_ATOMIC);
        }

        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_sess(struct qla_tgt_sess *sess)
{
        if (!sess)
                return;

        assert_spin_locked(&sess->vha->hw->hardware_lock);
        kref_put(&sess->se_sess->sess_kref, tcm_qla2xxx_release_session);
}

static void tcm_qla2xxx_shutdown_sess(struct qla_tgt_sess *sess)
{
        assert_spin_locked(&sess->vha->hw->hardware_lock);
        target_sess_cmd_list_set_waiting(sess->se_sess);
}

static int tcm_qla2xxx_init_nodeacl(struct se_node_acl *se_nacl,
                const char *name)
{
        struct tcm_qla2xxx_nacl *nacl =
                container_of(se_nacl, struct tcm_qla2xxx_nacl, se_node_acl);
        u64 wwnn;

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

        nacl->nport_wwnn = wwnn;
        tcm_qla2xxx_format_wwn(&nacl->nport_name[0], TCM_QLA2XXX_NAMELEN, wwnn);

        return 0;
}

/* 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", tpg->tpg_attrib.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);

/*
 * Define tcm_qla2xxx_tpg_attrib_s_demo_mode_login_only
 */
DEF_QLA_TPG_ATTR_BOOL(demo_mode_login_only);
DEF_QLA_TPG_ATTRIB(demo_mode_login_only);
QLA_TPG_ATTR(demo_mode_login_only, 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,
        &tcm_qla2xxx_tpg_attrib_demo_mode_login_only.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 void tcm_qla2xxx_depend_tpg(struct work_struct *work)
{
        struct tcm_qla2xxx_tpg *base_tpg = container_of(work,
                                struct tcm_qla2xxx_tpg, tpg_base_work);
        struct se_portal_group *se_tpg = &base_tpg->se_tpg;
        struct scsi_qla_host *base_vha = base_tpg->lport->qla_vha;

        if (!target_depend_item(&se_tpg->tpg_group.cg_item)) {
                atomic_set(&base_tpg->lport_tpg_enabled, 1);
                qlt_enable_vha(base_vha);
        }
        complete(&base_tpg->tpg_base_comp);
}

static void tcm_qla2xxx_undepend_tpg(struct work_struct *work)
{
        struct tcm_qla2xxx_tpg *base_tpg = container_of(work,
                                struct tcm_qla2xxx_tpg, tpg_base_work);
        struct se_portal_group *se_tpg = &base_tpg->se_tpg;
        struct scsi_qla_host *base_vha = base_tpg->lport->qla_vha;

        if (!qlt_stop_phase1(base_vha->vha_tgt.qla_tgt)) {
                atomic_set(&base_tpg->lport_tpg_enabled, 0);
                target_undepend_item(&se_tpg->tpg_group.cg_item);
        }
        complete(&base_tpg->tpg_base_comp);
}

static ssize_t tcm_qla2xxx_tpg_store_enable(
        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 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) {
                if (atomic_read(&tpg->lport_tpg_enabled))
                        return -EEXIST;

                INIT_WORK(&tpg->tpg_base_work, tcm_qla2xxx_depend_tpg);
        } else {
                if (!atomic_read(&tpg->lport_tpg_enabled))
                        return count;

                INIT_WORK(&tpg->tpg_base_work, tcm_qla2xxx_undepend_tpg);
        }
        init_completion(&tpg->tpg_base_comp);
        schedule_work(&tpg->tpg_base_work);
        wait_for_completion(&tpg->tpg_base_comp);

        if (op) {
                if (!atomic_read(&tpg->lport_tpg_enabled))
                        return -ENODEV;
        } else {
                if (atomic_read(&tpg->lport_tpg_enabled))
                        return -EPERM;
        }
        return count;
}

TF_TPG_BASE_ATTR(tcm_qla2xxx, enable, S_IRUGO | S_IWUSR);

static ssize_t tcm_qla2xxx_tpg_show_dynamic_sessions(
        struct se_portal_group *se_tpg,
        char *page)
{
        return target_show_dynamic_sessions(se_tpg, page);
}

TF_TPG_BASE_ATTR_RO(tcm_qla2xxx, dynamic_sessions);

static ssize_t tcm_qla2xxx_tpg_store_fabric_prot_type(
        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 = kstrtoul(page, 0, &val);

        if (ret) {
                pr_err("kstrtoul() returned %d for fabric_prot_type\n", ret);
                return ret;
        }
        if (val != 0 && val != 1 && val != 3) {
                pr_err("Invalid qla2xxx fabric_prot_type: %lu\n", val);
                return -EINVAL;
        }
        tpg->tpg_attrib.fabric_prot_type = val;

        return count;
}

static ssize_t tcm_qla2xxx_tpg_show_fabric_prot_type(
        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, "%d\n", tpg->tpg_attrib.fabric_prot_type);
}
TF_TPG_BASE_ATTR(tcm_qla2xxx, fabric_prot_type, S_IRUGO | S_IWUSR);

static struct configfs_attribute *tcm_qla2xxx_tpg_attrs[] = {
        &tcm_qla2xxx_tpg_enable.attr,
        &tcm_qla2xxx_tpg_dynamic_sessions.attr,
        &tcm_qla2xxx_tpg_fabric_prot_type.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 ((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
         */
        tpg->tpg_attrib.generate_node_acls = 1;
        tpg->tpg_attrib.demo_mode_write_protect = 1;
        tpg->tpg_attrib.cache_dynamic_acls = 1;
        tpg->tpg_attrib.demo_mode_login_only = 1;

        ret = core_tpg_register(wwn, &tpg->se_tpg, SCSI_PROTOCOL_FCP);
        if (ret < 0) {
                kfree(tpg);
                return 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;
        /*
         * Call into qla2x_target.c LLD logic to shutdown the active
         * FC Nexuses and disable target mode operation for this qla_hw_data
         */
        if (vha->vha_tgt.qla_tgt && !vha->vha_tgt.qla_tgt->tgt_stop)
                qlt_stop_phase1(vha->vha_tgt.qla_tgt);

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

static ssize_t tcm_qla2xxx_npiv_tpg_show_enable(
        struct se_portal_group *se_tpg,
        char *page)
{
        return tcm_qla2xxx_tpg_show_enable(se_tpg, page);
}

static ssize_t tcm_qla2xxx_npiv_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 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) {
                if (atomic_read(&tpg->lport_tpg_enabled))
                        return -EEXIST;

                atomic_set(&tpg->lport_tpg_enabled, 1);
                qlt_enable_vha(vha);
        } else {
                if (!atomic_read(&tpg->lport_tpg_enabled))
                        return count;

                atomic_set(&tpg->lport_tpg_enabled, 0);
                qlt_stop_phase1(vha->vha_tgt.qla_tgt);
        }

        return count;
}

TF_TPG_BASE_ATTR(tcm_qla2xxx_npiv, enable, S_IRUGO | S_IWUSR);

static struct configfs_attribute *tcm_qla2xxx_npiv_tpg_attrs[] = {
        &tcm_qla2xxx_npiv_tpg_enable.attr,
        NULL,
};

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;

        /*
         * By default allow READ-ONLY TPG demo-mode access w/ cached dynamic
         * NodeACLs
         */
        tpg->tpg_attrib.generate_node_acls = 1;
        tpg->tpg_attrib.demo_mode_write_protect = 1;
        tpg->tpg_attrib.cache_dynamic_acls = 1;
        tpg->tpg_attrib.demo_mode_login_only = 1;

        ret = core_tpg_register(wwn, &tpg->se_tpg, SCSI_PROTOCOL_FCP);
        if (ret < 0) {
                kfree(tpg);
                return NULL;
        }
        lport->tpg_1 = tpg;
        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 tcm_qla2xxx_lport *lport;
        struct se_node_acl *se_nacl;
        struct tcm_qla2xxx_nacl *nacl;
        u32 key;

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

        key = sid_to_key(s_id);
        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 = sid_to_key(s_id);
        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 tcm_qla2xxx_lport *lport;
        struct se_node_acl *se_nacl;
        struct tcm_qla2xxx_nacl *nacl;
        struct tcm_qla2xxx_fc_loopid *fc_loopid;

        lport = vha->vha_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;
        scsi_qla_host_t *vha = pci_get_drvdata(ha->pdev);
        struct se_session *se_sess;
        struct tcm_qla2xxx_lport *lport;

        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;
        }

        lport = vha->vha_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);

        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;
        int num_tags = (ha->fw_xcb_count) ? ha->fw_xcb_count :
                       TCM_QLA2XXX_DEFAULT_TAGS;

        lport = vha->vha_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_tags(num_tags,
                                              sizeof(struct qla_tgt_cmd),
                                              TARGET_PROT_ALL);
        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, sizeof(port_name), "%8phC", fc_wwpn);
        /*
         * 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;
}

static void tcm_qla2xxx_update_sess(struct qla_tgt_sess *sess, port_id_t s_id,
                                    uint16_t loop_id, bool conf_compl_supported)
{
        struct qla_tgt *tgt = sess->tgt;
        struct qla_hw_data *ha = tgt->ha;
        scsi_qla_host_t *vha = pci_get_drvdata(ha->pdev);
        struct tcm_qla2xxx_lport *lport = vha->vha_tgt.target_lport_ptr;
        struct se_node_acl *se_nacl = sess->se_sess->se_node_acl;
        struct tcm_qla2xxx_nacl *nacl = container_of(se_nacl,
                        struct tcm_qla2xxx_nacl, se_node_acl);
        u32 key;


        if (sess->loop_id != loop_id || sess->s_id.b24 != s_id.b24)
                pr_info("Updating session %p from port %8phC loop_id %d -> %d s_id %x:%x:%x -> %x:%x:%x\n",
                    sess, sess->port_name,
                    sess->loop_id, loop_id, sess->s_id.b.domain,
                    sess->s_id.b.area, sess->s_id.b.al_pa, s_id.b.domain,
                    s_id.b.area, s_id.b.al_pa);

        if (sess->loop_id != loop_id) {
                /*
                 * Because we can shuffle loop IDs around and we
                 * update different sessions non-atomically, we might
                 * have overwritten this session's old loop ID
                 * already, and we might end up overwriting some other
                 * session that will be updated later.  So we have to
                 * be extra careful and we can't warn about those things...
                 */
                if (lport->lport_loopid_map[sess->loop_id].se_nacl == se_nacl)
                        lport->lport_loopid_map[sess->loop_id].se_nacl = NULL;

                lport->lport_loopid_map[loop_id].se_nacl = se_nacl;

                sess->loop_id = loop_id;
        }

        if (sess->s_id.b24 != s_id.b24) {
                key = (((u32) sess->s_id.b.domain << 16) |
                       ((u32) sess->s_id.b.area   <<  8) |
                       ((u32) sess->s_id.b.al_pa));

                if (btree_lookup32(&lport->lport_fcport_map, key))
                        WARN(btree_remove32(&lport->lport_fcport_map, key) != se_nacl,
                             "Found wrong se_nacl when updating s_id %x:%x:%x\n",
                             sess->s_id.b.domain, sess->s_id.b.area, sess->s_id.b.al_pa);
                else
                        WARN(1, "No lport_fcport_map entry for s_id %x:%x:%x\n",
                             sess->s_id.b.domain, sess->s_id.b.area, sess->s_id.b.al_pa);

                key = (((u32) s_id.b.domain << 16) |
                       ((u32) s_id.b.area   <<  8) |
                       ((u32) s_id.b.al_pa));

                if (btree_lookup32(&lport->lport_fcport_map, key)) {
                        WARN(1, "Already have lport_fcport_map entry for s_id %x:%x:%x\n",
                             s_id.b.domain, s_id.b.area, s_id.b.al_pa);
                        btree_update32(&lport->lport_fcport_map, key, se_nacl);
                } else {
                        btree_insert32(&lport->lport_fcport_map, key, se_nacl, GFP_ATOMIC);
                }

                sess->s_id = s_id;
                nacl->nport_id = key;
        }

        sess->conf_compl_supported = conf_compl_supported;

        /* Reset logout parameters to default */
        sess->logout_on_delete = 1;
        sess->keep_nport_handle = 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_dif_err         = tcm_qla2xxx_handle_dif_err,
        .handle_tmr             = tcm_qla2xxx_handle_tmr,
        .free_cmd               = tcm_qla2xxx_free_cmd,
        .free_mcmd              = tcm_qla2xxx_free_mcmd,
        .free_session           = tcm_qla2xxx_free_session,
        .update_sess            = tcm_qla2xxx_update_sess,
        .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,
                                         void *target_lport_ptr,
                                         u64 npiv_wwpn, u64 npiv_wwnn)
{
        struct qla_hw_data *ha = vha->hw;
        struct tcm_qla2xxx_lport *lport =
                        (struct tcm_qla2xxx_lport *)target_lport_ptr;
        /*
         * Setup tgt_ops, local pointer to vha and target_lport_ptr
         */
        ha->tgt.tgt_ops = &tcm_qla2xxx_template;
        vha->vha_tgt.target_lport_ptr = 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);
        sprintf(lport->lport_naa_name, "naa.%016llx", (unsigned long long) wwpn);

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

        ret = qlt_lport_register(lport, wwpn, 0, 0,
                                 tcm_qla2xxx_lport_register_cb);
        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 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 (vha->vha_tgt.qla_tgt && !vha->vha_tgt.qla_tgt->tgt_stopped)
                qlt_stop_phase2(vha->vha_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 int tcm_qla2xxx_lport_register_npiv_cb(struct scsi_qla_host *base_vha,
                                              void *target_lport_ptr,
                                              u64 npiv_wwpn, u64 npiv_wwnn)
{
        struct fc_vport *vport;
        struct Scsi_Host *sh = base_vha->host;
        struct scsi_qla_host *npiv_vha;
        struct tcm_qla2xxx_lport *lport =
                        (struct tcm_qla2xxx_lport *)target_lport_ptr;
        struct tcm_qla2xxx_lport *base_lport =
                        (struct tcm_qla2xxx_lport *)base_vha->vha_tgt.target_lport_ptr;
        struct fc_vport_identifiers vport_id;

        if (!qla_tgt_mode_enabled(base_vha)) {
                pr_err("qla2xxx base_vha not enabled for target mode\n");
                return -EPERM;
        }

        if (!base_lport || !base_lport->tpg_1 ||
            !atomic_read(&base_lport->tpg_1->lport_tpg_enabled)) {
                pr_err("qla2xxx base_lport or tpg_1 not available\n");
                return -EPERM;
        }

        memset(&vport_id, 0, sizeof(vport_id));
        vport_id.port_name = npiv_wwpn;
        vport_id.node_name = npiv_wwnn;
        vport_id.roles = FC_PORT_ROLE_FCP_INITIATOR;
        vport_id.vport_type = FC_PORTTYPE_NPIV;
        vport_id.disable = false;

        vport = fc_vport_create(sh, 0, &vport_id);
        if (!vport) {
                pr_err("fc_vport_create failed for qla2xxx_npiv\n");
                return -ENODEV;
        }
        /*
         * Setup local pointer to NPIV vhba + target_lport_ptr
         */
        npiv_vha = (struct scsi_qla_host *)vport->dd_data;
        npiv_vha->vha_tgt.target_lport_ptr = target_lport_ptr;
        lport->qla_vha = npiv_vha;
        scsi_host_get(npiv_vha->host);
        return 0;
}


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 phys_wwpn, npiv_wwpn, npiv_wwnn;
        char *p, tmp[128];
        int ret;

        snprintf(tmp, 128, "%s", name);

        p = strchr(tmp, '@');
        if (!p) {
                pr_err("Unable to locate NPIV '@' seperator\n");
                return ERR_PTR(-EINVAL);
        }
        *p++ = '\0';

        if (tcm_qla2xxx_parse_wwn(tmp, &phys_wwpn, 1) < 0)
                return ERR_PTR(-EINVAL);

        if (tcm_qla2xxx_npiv_parse_wwn(p, strlen(p)+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;
        sprintf(lport->lport_naa_name, "naa.%016llx", (unsigned long long) npiv_wwpn);

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

        ret = qlt_lport_register(lport, phys_wwpn, npiv_wwpn, npiv_wwnn,
                                 tcm_qla2xxx_lport_register_npiv_cb);
        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_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 *npiv_vha = lport->qla_vha;
        struct qla_hw_data *ha = npiv_vha->hw;
        scsi_qla_host_t *base_vha = pci_get_drvdata(ha->pdev);

        scsi_host_put(npiv_vha->host);
        /*
         * Notify libfc that we want to release the vha->fc_vport
         */
        fc_vport_terminate(npiv_vha->fc_vport);
        scsi_host_put(base_vha->host);
        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 const struct target_core_fabric_ops tcm_qla2xxx_ops = {
        .module                         = THIS_MODULE,
        .name                           = "qla2xxx",
        .node_acl_size                  = sizeof(struct tcm_qla2xxx_nacl),
        /*
         * XXX: Limit assumes single page per scatter-gather-list entry.
         * Current maximum is ~4.9 MB per se_cmd->t_data_sg with PAGE_SIZE=4096
         */
        .max_data_sg_nents              = 1200,
        .get_fabric_name                = tcm_qla2xxx_get_fabric_name,
        .tpg_get_wwn                    = tcm_qla2xxx_get_fabric_wwn,
        .tpg_get_tag                    = tcm_qla2xxx_get_tag,
        .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_prot_fabric_only     = tcm_qla2xxx_check_prot_fabric_only,
        .tpg_check_demo_mode_login_only = tcm_qla2xxx_check_demo_mode_login_only,
        .tpg_get_inst_index             = tcm_qla2xxx_tpg_get_inst_index,
        .check_stop_free                = tcm_qla2xxx_check_stop_free,
        .release_cmd                    = tcm_qla2xxx_release_cmd,
        .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_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,
        .aborted_task                   = tcm_qla2xxx_aborted_task,
        /*
         * 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_init_nodeacl            = tcm_qla2xxx_init_nodeacl,

        .tfc_wwn_attrs                  = tcm_qla2xxx_wwn_attrs,
        .tfc_tpg_base_attrs             = tcm_qla2xxx_tpg_attrs,
        .tfc_tpg_attrib_attrs           = tcm_qla2xxx_tpg_attrib_attrs,
};

static const struct target_core_fabric_ops tcm_qla2xxx_npiv_ops = {
        .module                         = THIS_MODULE,
        .name                           = "qla2xxx_npiv",
        .node_acl_size                  = sizeof(struct tcm_qla2xxx_nacl),
        .get_fabric_name                = tcm_qla2xxx_npiv_get_fabric_name,
        .tpg_get_wwn                    = tcm_qla2xxx_get_fabric_wwn,
        .tpg_get_tag                    = tcm_qla2xxx_get_tag,
        .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_mode,
        .tpg_check_prod_mode_write_protect =
            tcm_qla2xxx_check_prod_write_protect,
        .tpg_check_demo_mode_login_only = tcm_qla2xxx_check_demo_mode_login_only,
        .tpg_get_inst_index             = tcm_qla2xxx_tpg_get_inst_index,
        .check_stop_free                = tcm_qla2xxx_check_stop_free,
        .release_cmd                    = tcm_qla2xxx_release_cmd,
        .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_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,
        .aborted_task                   = tcm_qla2xxx_aborted_task,
        /*
         * 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_init_nodeacl            = tcm_qla2xxx_init_nodeacl,

        .tfc_wwn_attrs                  = tcm_qla2xxx_wwn_attrs,
        .tfc_tpg_base_attrs             = tcm_qla2xxx_npiv_tpg_attrs,
};

static int tcm_qla2xxx_register_configfs(void)
{
        int ret;

        pr_debug("TCM QLOGIC QLA2XXX fabric module %s on %s/%s on "
            UTS_RELEASE"\n", TCM_QLA2XXX_VERSION, utsname()->sysname,
            utsname()->machine);

        ret = target_register_template(&tcm_qla2xxx_ops);
        if (ret)
                return ret;

        ret = target_register_template(&tcm_qla2xxx_npiv_ops);
        if (ret)
                goto out_fabric;

        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_unregister_template(&tcm_qla2xxx_npiv_ops);
out_fabric:
        target_unregister_template(&tcm_qla2xxx_ops);
        return ret;
}

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

        target_unregister_template(&tcm_qla2xxx_ops);
        target_unregister_template(&tcm_qla2xxx_npiv_ops);
}

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 QLA24XX+ series NPIV enabled fabric driver");
MODULE_LICENSE("GPL");
module_init(tcm_qla2xxx_init);
module_exit(tcm_qla2xxx_exit);