path: root/drivers/target/iscsi/iscsi_target_configfs.c

/*******************************************************************************
 * This file contains the configfs implementation for iSCSI Target mode
 * from the LIO-Target Project.
 *
 * (c) Copyright 2007-2013 Datera, Inc.
 *
 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
 *
 * 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/configfs.h>
#include <linux/ctype.h>
#include <linux/export.h>
#include <linux/inet.h>
#include <target/target_core_base.h>
#include <target/target_core_fabric.h>
#include <target/iscsi/iscsi_transport.h>

#include <target/iscsi/iscsi_target_core.h>
#include "iscsi_target_parameters.h"
#include "iscsi_target_device.h"
#include "iscsi_target_erl0.h"
#include "iscsi_target_nodeattrib.h"
#include "iscsi_target_tpg.h"
#include "iscsi_target_util.h"
#include "iscsi_target.h"
#include <target/iscsi/iscsi_target_stat.h>


/* Start items for lio_target_portal_cit */

static inline struct iscsi_tpg_np *to_iscsi_tpg_np(struct config_item *item)
{
	return container_of(to_tpg_np(item), struct iscsi_tpg_np, se_tpg_np);
}

static ssize_t lio_target_np_driver_show(struct config_item *item, char *page,
					 enum iscsit_transport_type type)
{
	struct iscsi_tpg_np *tpg_np = to_iscsi_tpg_np(item);
	struct iscsi_tpg_np *tpg_np_new;
	ssize_t rb;

	tpg_np_new = iscsit_tpg_locate_child_np(tpg_np, type);
	if (tpg_np_new)
		rb = sprintf(page, "1\n");
	else
		rb = sprintf(page, "0\n");

	return rb;
}

static ssize_t lio_target_np_driver_store(struct config_item *item,
		const char *page, size_t count, enum iscsit_transport_type type,
		const char *mod_name)
{
	struct iscsi_tpg_np *tpg_np = to_iscsi_tpg_np(item);
	struct iscsi_np *np;
	struct iscsi_portal_group *tpg;
	struct iscsi_tpg_np *tpg_np_new = NULL;
	u32 op;
	int rc;

	rc = kstrtou32(page, 0, &op);
	if (rc)
		return rc;
	if ((op != 1) && (op != 0)) {
		pr_err("Illegal value for tpg_enable: %u\n", op);
		return -EINVAL;
	}
	np = tpg_np->tpg_np;
	if (!np) {
		pr_err("Unable to locate struct iscsi_np from"
				" struct iscsi_tpg_np\n");
		return -EINVAL;
	}

	tpg = tpg_np->tpg;
	if (iscsit_get_tpg(tpg) < 0)
		return -EINVAL;

	if (op) {
		if (strlen(mod_name)) {
			rc = request_module(mod_name);
			if (rc != 0) {
				pr_warn("Unable to request_module for %s\n",
					mod_name);
				rc = 0;
			}
		}

		tpg_np_new = iscsit_tpg_add_network_portal(tpg,
					&np->np_sockaddr, tpg_np, type);
		if (IS_ERR(tpg_np_new))
			goto out;
	} else {
		tpg_np_new = iscsit_tpg_locate_child_np(tpg_np, type);
		if (tpg_np_new) {
			rc = iscsit_tpg_del_network_portal(tpg, tpg_np_new);
			if (rc < 0)
				goto out;
		}
	}

	iscsit_put_tpg(tpg);
	return count;
out:
	iscsit_put_tpg(tpg);
	return rc;
}

static ssize_t lio_target_np_iser_show(struct config_item *item, char *page)
{
	return lio_target_np_driver_show(item, page, ISCSI_INFINIBAND);
}

static ssize_t lio_target_np_iser_store(struct config_item *item,
					const char *page, size_t count)
{
	return lio_target_np_driver_store(item, page, count,
					  ISCSI_INFINIBAND, "ib_isert");
}
CONFIGFS_ATTR(lio_target_np_, iser);

static ssize_t lio_target_np_hw_offload_show(struct config_item *item, char *page)
{
	return lio_target_np_driver_show(item, page, ISCSI_HW_OFFLOAD);
}

static ssize_t lio_target_np_hw_offload_store(struct config_item *item,
					      const char *page, size_t count)
{
	return lio_target_np_dr