path: root/drivers/target/target_core_cdb.c

/*
 * CDB emulation for non-READ/WRITE commands.
 *
 * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc.
 * Copyright (c) 2005, 2006, 2007 SBE, Inc.
 * Copyright (c) 2007-2010 Rising Tide Systems
 * Copyright (c) 2008-2010 Linux-iSCSI.org
 *
 * Nicholas A. Bellinger <nab@kernel.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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <asm/unaligned.h>
#include <scsi/scsi.h>

#include <target/target_core_base.h>
#include <target/target_core_transport.h>
#include <target/target_core_fabric_ops.h>
#include "target_core_ua.h"
#include "target_core_cdb.h"

static void
target_fill_alua_data(struct se_port *port, unsigned char *buf)
{
	struct t10_alua_tg_pt_gp *tg_pt_gp;
	struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;

	/*
	 * Set SCCS for MAINTENANCE_IN + REPORT_TARGET_PORT_GROUPS.
	 */
	buf[5]	= 0x80;

	/*
	 * Set TPGS field for explict and/or implict ALUA access type
	 * and opteration.
	 *
	 * See spc4r17 section 6.4.2 Table 135
	 */
	if (!port)
		return;
	tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
	if (!tg_pt_gp_mem)
		return;

	spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
	tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
	if (tg_pt_gp)
		buf[5] |= tg_pt_gp->tg_pt_gp_alua_access_type;
	spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
}

static int
target_emulate_inquiry_std(struct se_cmd *cmd)
{
	struct se_lun *lun = cmd->se_lun;
	struct se_device *dev = cmd->se_dev;
	struct se_portal_group *tpg = lun->lun_sep->sep_tpg;
	unsigned char *buf;

	/*
	 * Make sure we at least have 6 bytes of INQUIRY response
	 * payload going back for EVPD=0
	 */
	if (cmd->data_length < 6) {
		pr_err("SCSI Inquiry payload length: %u"
			" too small for EVPD=0\n", cmd->data_length);
		return -EINVAL;
	}

	buf = transport_kmap_first_data_page(cmd);

	if (dev == tpg->tpg_virt_lun0.lun_se_dev) {
		buf[0] = 0x3f; /* Not connected */
	} else {
		buf[0] = dev->transport->get_device_type(dev);
		if (buf[0] == TYPE_TAPE)
			buf[1] = 0x80;
	}
	buf[2] = dev->transport->get_device_rev(dev);

	/*
	 * Enable SCCS and TPGS fields for Emulated ALUA
	 */
	if (dev->se_sub_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED)
		target_fill_alua_data(lun->lun_sep, buf);

	if (cmd->data_length < 8) {
		buf[