iscsi_target_tpg.c

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/*******************************************************************************
 * This file contains iSCSI Target Portal Group related functions.
 *
 * \u00a9 Copyright 2007-2011 RisingTide Systems LLC.
 *
 * Licensed to the Linux Foundation under the General Public License (GPL) version 2.
 *
 * Author: Nicholas A. Bellinger <[email protected]>
 *
 * 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 <target/target_core_base.h>
#include <target/target_core_fabric.h>
#include <target/target_core_configfs.h>

#include "iscsi_target_core.h"
#include "iscsi_target_erl0.h"
#include "iscsi_target_login.h"
#include "iscsi_target_nodeattrib.h"
#include "iscsi_target_tpg.h"
#include "iscsi_target_util.h"
#include "iscsi_target.h"
#include "iscsi_target_parameters.h"

struct iscsi_portal_group *iscsit_alloc_portal_group(struct iscsi_tiqn *tiqn, u16 tpgt)
{
    struct iscsi_portal_group *tpg;

    tpg = kzalloc(sizeof(struct iscsi_portal_group), GFP_KERNEL);
    if (!tpg) {
        pr_err("Unable to allocate struct iscsi_portal_group\n");
        return NULL;
    }

    tpg->tpgt = tpgt;
    tpg->tpg_state = TPG_STATE_FREE;
    tpg->tpg_tiqn = tiqn;
    INIT_LIST_HEAD(&tpg->tpg_gnp_list);
    INIT_LIST_HEAD(&tpg->tpg_list);
    mutex_init(&tpg->tpg_access_lock);
    mutex_init(&tpg->np_login_lock);
    spin_lock_init(&tpg->tpg_state_lock);
    spin_lock_init(&tpg->tpg_np_lock);

    return tpg;
}

static void iscsit_set_default_tpg_attribs(struct iscsi_portal_group *);

int iscsit_load_discovery_tpg(void)
{
    struct iscsi_param *param;
    struct iscsi_portal_group *tpg;
    int ret;

    tpg = iscsit_alloc_portal_group(NULL, 1);
    if (!tpg) {
        pr_err("Unable to allocate struct iscsi_portal_group\n");
        return -1;
    }

    ret = core_tpg_register(
            &lio_target_fabric_configfs->tf_ops,
            NULL, &tpg->tpg_se_tpg, tpg,
            TRANSPORT_TPG_TYPE_DISCOVERY);
    if (ret < 0) {
        kfree(tpg);
        return -1;
    }

    tpg->sid = 1; /* First Assigned LIO Session ID */
    iscsit_set_default_tpg_attribs(tpg);

    if (iscsi_create_default_params(&tpg->param_list) < 0)
        goto out;
    /*
     * By default we disable authentication for discovery sessions,
     * this can be changed with:
     *
     * /sys/kernel/config/target/iscsi/discovery_auth/enforce_discovery_auth
     */
    param = iscsi_find_param_from_key(AUTHMETHOD, tpg->param_list);
    if (!param)
        goto out;

    if (iscsi_update_param_value(param, "CHAP,None") < 0)
        goto out;

    tpg->tpg_attrib.authentication = 0;

    spin_lock(&tpg->tpg_state_lock);
    tpg->tpg_state  = TPG_STATE_ACTIVE;
    spin_unlock(&tpg->tpg_state_lock);

    iscsit_global->discovery_tpg = tpg;
    pr_debug("CORE[0] - Allocated Discovery TPG\n");

    return 0;
out:
    if (tpg->sid == 1)
        core_tpg_deregister(&tpg->tpg_se_tpg);
    kfree(tpg);
    return -1;
}

void iscsit_release_discovery_tpg(void)
{
    struct iscsi_portal_group *tpg = iscsit_global->discovery_tpg;

    if (!tpg)
        return;

    core_tpg_deregister(&tpg->tpg_se_tpg);

    kfree(tpg);
    iscsit_global->discovery_tpg = NULL;
}

struct iscsi_portal_group *iscsit_get_tpg_from_np(
    struct iscsi_tiqn *tiqn,
    struct iscsi_np *np)
{
    struct iscsi_portal_group *tpg = NULL;
    struct iscsi_tpg_np *tpg_np;

    spin_lock(&tiqn->tiqn_tpg_lock);
    list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {

        spin_lock(&tpg->tpg_state_lock);
        if (tpg->tpg_state == TPG_STATE_FREE) {
            spin_unlock(&tpg->tpg_state_lock);
            continue;
        }
        spin_unlock(&tpg->tpg_state_lock);

        spin_lock(&tpg->tpg_np_lock);
        list_for_each_entry(tpg_np, &tpg->tpg_gnp_list, tpg_np_list) {
            if (tpg_np->tpg_np == np) {
                spin_unlock(&tpg->tpg_np_lock);
                spin_unlock(&tiqn->tiqn_tpg_lock);
                return tpg;
            }
        }
        spin_unlock(&tpg->tpg_np_lock);
    }
    spin_unlock(&tiqn->tiqn_tpg_lock);

    return NULL;
}

int iscsit_get_tpg(
    struct iscsi_portal_group *tpg)
{
    int ret;

    ret = mutex_lock_interruptible(&tpg->tpg_access_lock);
    return ((ret != 0) || signal_pending(current)) ? -1 : 0;
}

void iscsit_put_tpg(struct iscsi_portal_group *tpg)
{
    mutex_unlock(&tpg->tpg_access_lock);
}

static void iscsit_clear_tpg_np_login_thread(
    struct iscsi_tpg_np *tpg_np,
    struct iscsi_portal_group *tpg)
{
    if (!tpg_np->tpg_np) {
        pr_err("struct iscsi_tpg_np->tpg_np is NULL!\n");
        return;
    }

    iscsit_reset_np_thread(tpg_np->tpg_np, tpg_np, tpg);
}

void iscsit_clear_tpg_np_login_threads(
    struct iscsi_portal_group *tpg)
{
    struct iscsi_tpg_np *tpg_np;

    spin_lock(&tpg->tpg_np_lock);
    list_for_each_entry(tpg_np, &tpg->tpg_gnp_list, tpg_np_list) {
        if (!tpg_np->tpg_np) {
            pr_err("struct iscsi_tpg_np->tpg_np is NULL!\n");
            continue;
        }
        spin_unlock(&tpg->tpg_np_lock);
        iscsit_clear_tpg_np_login_thread(tpg_np, tpg);
        spin_lock(&tpg->tpg_np_lock);
    }
    spin_unlock(&tpg->tpg_np_lock);
}

void iscsit_tpg_dump_params(struct iscsi_portal_group *tpg)
{
    iscsi_print_params(tpg->param_list);
}

static void iscsit_set_default_tpg_attribs(struct iscsi_portal_group *tpg)
{
    struct iscsi_tpg_attrib *a = &tpg->tpg_attrib;

    a->authentication = TA_AUTHENTICATION;
    a->login_timeout = TA_LOGIN_TIMEOUT;
    a->netif_timeout = TA_NETIF_TIMEOUT;
    a->default_cmdsn_depth = TA_DEFAULT_CMDSN_DEPTH;
    a->generate_node_acls = TA_GENERATE_NODE_ACLS;
    a->cache_dynamic_acls = TA_CACHE_DYNAMIC_ACLS;
    a->demo_mode_write_protect = TA_DEMO_MODE_WRITE_PROTECT;
    a->prod_mode_write_protect = TA_PROD_MODE_WRITE_PROTECT;
}

int iscsit_tpg_add_portal_group(struct iscsi_tiqn *tiqn, struct iscsi_portal_group *tpg)
{
    if (tpg->tpg_state != TPG_STATE_FREE) {
        pr_err("Unable to add iSCSI Target Portal Group: %d"
            " while not in TPG_STATE_FREE state.\n", tpg->tpgt);
        return -EEXIST;
    }
    iscsit_set_default_tpg_attribs(tpg);

    if (iscsi_create_default_params(&tpg->param_list) < 0)
        goto err_out;

    ISCSI_TPG_ATTRIB(tpg)->tpg = tpg;

    spin_lock(&tpg->tpg_state_lock);
    tpg->tpg_state  = TPG_STATE_INACTIVE;
    spin_unlock(&tpg->tpg_state_lock);

    spin_lock(&tiqn->tiqn_tpg_lock);
    list_add_tail(&tpg->tpg_list, &tiqn->tiqn_tpg_list);
    tiqn->tiqn_ntpgs++;
    pr_debug("CORE[%s]_TPG[%hu] - Added iSCSI Target Portal Group\n",
            tiqn->tiqn, tpg->tpgt);
    spin_unlock(&tiqn->tiqn_tpg_lock);

    return 0;
err_out:
    if (tpg->param_list) {
        iscsi_release_param_list(tpg->param_list);
        tpg->param_list = NULL;
    }
    kfree(tpg);
    return -ENOMEM;
}

int iscsit_tpg_del_portal_group(
    struct iscsi_tiqn *tiqn,
    struct iscsi_portal_group *tpg,
    int force)
{
    u8 old_state = tpg->tpg_state;

    spin_lock(&tpg->tpg_state_lock);
    tpg->tpg_state = TPG_STATE_INACTIVE;
    spin_unlock(&tpg->tpg_state_lock);

    if (iscsit_release_sessions_for_tpg(tpg, force) < 0) {
        pr_err("Unable to delete iSCSI Target Portal Group:"
            " %hu while active sessions exist, and force=0\n",
            tpg->tpgt);
        tpg->tpg_state = old_state;
        return -EPERM;
    }

    core_tpg_clear_object_luns(&tpg->tpg_se_tpg);

    if (tpg->param_list) {
        iscsi_release_param_list(tpg->param_list);
        tpg->param_list = NULL;
    }

    core_tpg_deregister(&tpg->tpg_se_tpg);

    spin_lock(&tpg->tpg_state_lock);
    tpg->tpg_state = TPG_STATE_FREE;
    spin_unlock(&tpg->tpg_state_lock);

    spin_lock(&tiqn->tiqn_tpg_lock);
    tiqn->tiqn_ntpgs--;
    list_del(&tpg->tpg_list);
    spin_unlock(&tiqn->tiqn_tpg_lock);

    pr_debug("CORE[%s]_TPG[%hu] - Deleted iSCSI Target Portal Group\n",
            tiqn->tiqn, tpg->tpgt);

    kfree(tpg);
    return 0;
}

int iscsit_tpg_enable_portal_group(struct iscsi_portal_group *tpg)
{
    struct iscsi_param *param;
    struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
    int ret;

    spin_lock(&tpg->tpg_state_lock);
    if (tpg->tpg_state == TPG_STATE_ACTIVE) {
        pr_err("iSCSI target portal group: %hu is already"
            " active, ignoring request.\n", tpg->tpgt);
        spin_unlock(&tpg->tpg_state_lock);
        return -EINVAL;
    }
    /*
     * Make sure that AuthMethod does not contain None as an option
     * unless explictly disabled.  Set the default to CHAP if authentication
     * is enforced (as per default), and remove the NONE option.
     */
    param = iscsi_find_param_from_key(AUTHMETHOD, tpg->param_list);
    if (!param) {
        spin_unlock(&tpg->tpg_state_lock);
        return -EINVAL;
    }

    if (ISCSI_TPG_ATTRIB(tpg)->authentication) {
        if (!strcmp(param->value, NONE)) {
            ret = iscsi_update_param_value(param, CHAP);
            if (ret)
                goto err;
        }

        ret = iscsit_ta_authentication(tpg, 1);
        if (ret < 0)
            goto err;
    }

    tpg->tpg_state = TPG_STATE_ACTIVE;
    spin_unlock(&tpg->tpg_state_lock);

    spin_lock(&tiqn->tiqn_tpg_lock);
    tiqn->tiqn_active_tpgs++;
    pr_debug("iSCSI_TPG[%hu] - Enabled iSCSI Target Portal Group\n",
            tpg->tpgt);
    spin_unlock(&tiqn->tiqn_tpg_lock);

    return 0;

err:
    spin_unlock(&tpg->tpg_state_lock);
    return ret;
}

int iscsit_tpg_disable_portal_group(struct iscsi_portal_group *tpg, int force)
{
    struct iscsi_tiqn *tiqn;
    u8 old_state = tpg->tpg_state;

    spin_lock(&tpg->tpg_state_lock);
    if (tpg->tpg_state == TPG_STATE_INACTIVE) {
        pr_err("iSCSI Target Portal Group: %hu is already"
            " inactive, ignoring request.\n", tpg->tpgt);
        spin_unlock(&tpg->tpg_state_lock);
        return -EINVAL;
    }
    tpg->tpg_state = TPG_STATE_INACTIVE;
    spin_unlock(&tpg->tpg_state_lock);

    iscsit_clear_tpg_np_login_threads(tpg);

    if (iscsit_release_sessions_for_tpg(tpg, force) < 0) {
        spin_lock(&tpg->tpg_state_lock);
        tpg->tpg_state = old_state;
        spin_unlock(&tpg->tpg_state_lock);
        pr_err("Unable to disable iSCSI Target Portal Group:"
            " %hu while active sessions exist, and force=0\n",
            tpg->tpgt);
        return -EPERM;
    }

    tiqn = tpg->tpg_tiqn;
    if (!tiqn || (tpg == iscsit_global->discovery_tpg))
        return 0;

    spin_lock(&tiqn->tiqn_tpg_lock);
    tiqn->tiqn_active_tpgs--;
    pr_debug("iSCSI_TPG[%hu] - Disabled iSCSI Target Portal Group\n",
            tpg->tpgt);
    spin_unlock(&tiqn->tiqn_tpg_lock);

    return 0;
}

struct iscsi_node_attrib *iscsit_tpg_get_node_attrib(
    struct iscsi_session *sess)
{
    struct se_session *se_sess = sess->se_sess;
    struct se_node_acl *se_nacl = se_sess->se_node_acl;
    struct iscsi_node_acl *acl = container_of(se_nacl, struct iscsi_node_acl,
                    se_node_acl);

    return &acl->node_attrib;
}

struct iscsi_tpg_np *iscsit_tpg_locate_child_np(
    struct iscsi_tpg_np *tpg_np,
    int network_transport)
{
    struct iscsi_tpg_np *tpg_np_child, *tpg_np_child_tmp;

    spin_lock(&tpg_np->tpg_np_parent_lock);
    list_for_each_entry_safe(tpg_np_child, tpg_np_child_tmp,
            &tpg_np->tpg_np_parent_list, tpg_np_child_list) {
        if (tpg_np_child->tpg_np->np_network_transport ==
                network_transport) {
            spin_unlock(&tpg_np->tpg_np_parent_lock);
            return tpg_np_child;
        }
    }
    spin_unlock(&tpg_np->tpg_np_parent_lock);

    return NULL;
}

struct iscsi_tpg_np *iscsit_tpg_add_network_portal(
    struct iscsi_portal_group *tpg,
    struct __kernel_sockaddr_storage *sockaddr,
    char *ip_str,
    struct iscsi_tpg_np *tpg_np_parent,
    int network_transport)
{
    struct iscsi_np *np;
    struct iscsi_tpg_np *tpg_np;

    tpg_np = kzalloc(sizeof(struct iscsi_tpg_np), GFP_KERNEL);
    if (!tpg_np) {
        pr_err("Unable to allocate memory for"
                " struct iscsi_tpg_np.\n");
        return ERR_PTR(-ENOMEM);
    }

    np = iscsit_add_np(sockaddr, ip_str, network_transport);
    if (IS_ERR(np)) {
        kfree(tpg_np);
        return ERR_CAST(np);
    }

    INIT_LIST_HEAD(&tpg_np->tpg_np_list);
    INIT_LIST_HEAD(&tpg_np->tpg_np_child_list);
    INIT_LIST_HEAD(&tpg_np->tpg_np_parent_list);
    spin_lock_init(&tpg_np->tpg_np_parent_lock);
    tpg_np->tpg_np      = np;
    tpg_np->tpg     = tpg;

    spin_lock(&tpg->tpg_np_lock);
    list_add_tail(&tpg_np->tpg_np_list, &tpg->tpg_gnp_list);
    tpg->num_tpg_nps++;
    if (tpg->tpg_tiqn)
        tpg->tpg_tiqn->tiqn_num_tpg_nps++;
    spin_unlock(&tpg->tpg_np_lock);

    if (tpg_np_parent) {
        tpg_np->tpg_np_parent = tpg_np_parent;
        spin_lock(&tpg_np_parent->tpg_np_parent_lock);
        list_add_tail(&tpg_np->tpg_np_child_list,
            &tpg_np_parent->tpg_np_parent_list);
        spin_unlock(&tpg_np_parent->tpg_np_parent_lock);
    }

    pr_debug("CORE[%s] - Added Network Portal: %s:%hu,%hu on %s\n",
        tpg->tpg_tiqn->tiqn, np->np_ip, np->np_port, tpg->tpgt,
        (np->np_network_transport == ISCSI_TCP) ? "TCP" : "SCTP");

    return tpg_np;
}

static int iscsit_tpg_release_np(
    struct iscsi_tpg_np *tpg_np,
    struct iscsi_portal_group *tpg,
    struct iscsi_np *np)
{
    iscsit_clear_tpg_np_login_thread(tpg_np, tpg);

    pr_debug("CORE[%s] - Removed Network Portal: %s:%hu,%hu on %s\n",
        tpg->tpg_tiqn->tiqn, np->np_ip, np->np_port, tpg->tpgt,
        (np->np_network_transport == ISCSI_TCP) ? "TCP" : "SCTP");

    tpg_np->tpg_np = NULL;
    tpg_np->tpg = NULL;
    kfree(tpg_np);
    /*
     * iscsit_del_np() will shutdown struct iscsi_np when last TPG reference is released.
     */
    return iscsit_del_np(np);
}

int iscsit_tpg_del_network_portal(
    struct iscsi_portal_group *tpg,
    struct iscsi_tpg_np *tpg_np)
{
    struct iscsi_np *np;
    struct iscsi_tpg_np *tpg_np_child, *tpg_np_child_tmp;
    int ret = 0;

    np = tpg_np->tpg_np;
    if (!np) {
        pr_err("Unable to locate struct iscsi_np from"
                " struct iscsi_tpg_np\n");
        return -EINVAL;
    }

    if (!tpg_np->tpg_np_parent) {
        /*
         * We are the parent tpg network portal.  Release all of the
         * child tpg_np's (eg: the non ISCSI_TCP ones) on our parent
         * list first.
         */
        list_for_each_entry_safe(tpg_np_child, tpg_np_child_tmp,
                &tpg_np->tpg_np_parent_list,
                tpg_np_child_list) {
            ret = iscsit_tpg_del_network_portal(tpg, tpg_np_child);
            if (ret < 0)
                pr_err("iscsit_tpg_del_network_portal()"
                    " failed: %d\n", ret);
        }
    } else {
        /*
         * We are not the parent ISCSI_TCP tpg network portal.  Release
         * our own network portals from the child list.
         */
        spin_lock(&tpg_np->tpg_np_parent->tpg_np_parent_lock);
        list_del(&tpg_np->tpg_np_child_list);
        spin_unlock(&tpg_np->tpg_np_parent->tpg_np_parent_lock);
    }

    spin_lock(&tpg->tpg_np_lock);
    list_del(&tpg_np->tpg_np_list);
    tpg->num_tpg_nps--;
    if (tpg->tpg_tiqn)
        tpg->tpg_tiqn->tiqn_num_tpg_nps--;
    spin_unlock(&tpg->tpg_np_lock);

    return iscsit_tpg_release_np(tpg_np, tpg, np);
}

int iscsit_tpg_set_initiator_node_queue_depth(
    struct iscsi_portal_group *tpg,
    unsigned char *initiatorname,
    u32 queue_depth,
    int force)
{
    return core_tpg_set_initiator_node_queue_depth(&tpg->tpg_se_tpg,
        initiatorname, queue_depth, force);
}

int iscsit_ta_authentication(struct iscsi_portal_group *tpg, u32 authentication)
{
    unsigned char buf1[256], buf2[256], *none = NULL;
    int len;
    struct iscsi_param *param;
    struct iscsi_tpg_attrib *a = &tpg->tpg_attrib;

    if ((authentication != 1) && (authentication != 0)) {
        pr_err("Illegal value for authentication parameter:"
            " %u, ignoring request.\n", authentication);
        return -EINVAL;
    }

    memset(buf1, 0, sizeof(buf1));
    memset(buf2, 0, sizeof(buf2));

    param = iscsi_find_param_from_key(AUTHMETHOD, tpg->param_list);
    if (!param)
        return -EINVAL;

    if (authentication) {
        snprintf(buf1, sizeof(buf1), "%s", param->value);
        none = strstr(buf1, NONE);
        if (!none)
            goto out;
        if (!strncmp(none + 4, ",", 1)) {
            if (!strcmp(buf1, none))
                sprintf(buf2, "%s", none+5);
            else {
                none--;
                *none = '\0';
                len = sprintf(buf2, "%s", buf1);
                none += 5;
                sprintf(buf2 + len, "%s", none);
            }
        } else {
            none--;
            *none = '\0';
            sprintf(buf2, "%s", buf1);
        }
        if (iscsi_update_param_value(param, buf2) < 0)
            return -EINVAL;
    } else {
        snprintf(buf1, sizeof(buf1), "%s", param->value);
        none = strstr(buf1, NONE);
        if (none)
            goto out;
        strncat(buf1, ",", strlen(","));
        strncat(buf1, NONE, strlen(NONE));
        if (iscsi_update_param_value(param, buf1) < 0)
            return -EINVAL;
    }

out:
    a->authentication = authentication;
    pr_debug("%s iSCSI Authentication Methods for TPG: %hu.\n",
        a->authentication ? "Enforcing" : "Disabling", tpg->tpgt);

    return 0;
}

int iscsit_ta_login_timeout(
    struct iscsi_portal_group *tpg,
    u32 login_timeout)
{
    struct iscsi_tpg_attrib *a = &tpg->tpg_attrib;

    if (login_timeout > TA_LOGIN_TIMEOUT_MAX) {
        pr_err("Requested Login Timeout %u larger than maximum"
            " %u\n", login_timeout, TA_LOGIN_TIMEOUT_MAX);
        return -EINVAL;
    } else if (login_timeout < TA_LOGIN_TIMEOUT_MIN) {
        pr_err("Requested Logout Timeout %u smaller than"
            " minimum %u\n", login_timeout, TA_LOGIN_TIMEOUT_MIN);
        return -EINVAL;
    }

    a->login_timeout = login_timeout;
    pr_debug("Set Logout Timeout to %u for Target Portal Group"
        " %hu\n", a->login_timeout, tpg->tpgt);

    return 0;
}

int iscsit_ta_netif_timeout(
    struct iscsi_portal_group *tpg,
    u32 netif_timeout)
{
    struct iscsi_tpg_attrib *a = &tpg->tpg_attrib;

    if (netif_timeout > TA_NETIF_TIMEOUT_MAX) {
        pr_err("Requested Network Interface Timeout %u larger"
            " than maximum %u\n", netif_timeout,
                TA_NETIF_TIMEOUT_MAX);
        return -EINVAL;
    } else if (netif_timeout < TA_NETIF_TIMEOUT_MIN) {
        pr_err("Requested Network Interface Timeout %u smaller"
            " than minimum %u\n", netif_timeout,
                TA_NETIF_TIMEOUT_MIN);
        return -EINVAL;
    }

    a->netif_timeout = netif_timeout;
    pr_debug("Set Network Interface Timeout to %u for"
        " Target Portal Group %hu\n", a->netif_timeout, tpg->tpgt);

    return 0;
}

int iscsit_ta_generate_node_acls(
    struct iscsi_portal_group *tpg,
    u32 flag)
{
    struct iscsi_tpg_attrib *a = &tpg->tpg_attrib;

    if ((flag != 0) && (flag != 1)) {
        pr_err("Illegal value %d\n", flag);
        return -EINVAL;
    }

    a->generate_node_acls = flag;
    pr_debug("iSCSI_TPG[%hu] - Generate Initiator Portal Group ACLs: %s\n",
        tpg->tpgt, (a->generate_node_acls) ? "Enabled" : "Disabled");

    if (flag == 1 && a->cache_dynamic_acls == 0) {
        pr_debug("Explicitly setting cache_dynamic_acls=1 when "
            "generate_node_acls=1\n");
        a->cache_dynamic_acls = 1;
    }

    return 0;
}

int iscsit_ta_default_cmdsn_depth(
    struct iscsi_portal_group *tpg,
    u32 tcq_depth)
{
    struct iscsi_tpg_attrib *a = &tpg->tpg_attrib;

    if (tcq_depth > TA_DEFAULT_CMDSN_DEPTH_MAX) {
        pr_err("Requested Default Queue Depth: %u larger"
            " than maximum %u\n", tcq_depth,
                TA_DEFAULT_CMDSN_DEPTH_MAX);
        return -EINVAL;
    } else if (tcq_depth < TA_DEFAULT_CMDSN_DEPTH_MIN) {
        pr_err("Requested Default Queue Depth: %u smaller"
            " than minimum %u\n", tcq_depth,
                TA_DEFAULT_CMDSN_DEPTH_MIN);
        return -EINVAL;
    }

    a->default_cmdsn_depth = tcq_depth;
    pr_debug("iSCSI_TPG[%hu] - Set Default CmdSN TCQ Depth to %u\n",
        tpg->tpgt, a->default_cmdsn_depth);

    return 0;
}

int iscsit_ta_cache_dynamic_acls(
    struct iscsi_portal_group *tpg,
    u32 flag)
{
    struct iscsi_tpg_attrib *a = &tpg->tpg_attrib;

    if ((flag != 0) && (flag != 1)) {
        pr_err("Illegal value %d\n", flag);
        return -EINVAL;
    }

    if (a->generate_node_acls == 1 && flag == 0) {
        pr_debug("Skipping cache_dynamic_acls=0 when"
            " generate_node_acls=1\n");
        return 0;
    }

    a->cache_dynamic_acls = flag;
    pr_debug("iSCSI_TPG[%hu] - Cache Dynamic Initiator Portal Group"
        " ACLs %s\n", tpg->tpgt, (a->cache_dynamic_acls) ?
        "Enabled" : "Disabled");

    return 0;
}

int iscsit_ta_demo_mode_write_protect(
    struct iscsi_portal_group *tpg,
    u32 flag)
{
    struct iscsi_tpg_attrib *a = &tpg->tpg_attrib;

    if ((flag != 0) && (flag != 1)) {
        pr_err("Illegal value %d\n", flag);
        return -EINVAL;
    }

    a->demo_mode_write_protect = flag;
    pr_debug("iSCSI_TPG[%hu] - Demo Mode Write Protect bit: %s\n",
        tpg->tpgt, (a->demo_mode_write_protect) ? "ON" : "OFF");

    return 0;
}

int iscsit_ta_prod_mode_write_protect(
    struct iscsi_portal_group *tpg,
    u32 flag)
{
    struct iscsi_tpg_attrib *a = &tpg->tpg_attrib;

    if ((flag != 0) && (flag != 1)) {
        pr_err("Illegal value %d\n", flag);
        return -EINVAL;
    }

    a->prod_mode_write_protect = flag;
    pr_debug("iSCSI_TPG[%hu] - Production Mode Write Protect bit:"
        " %s\n", tpg->tpgt, (a->prod_mode_write_protect) ?
        "ON" : "OFF");

    return 0;
}