path: root/drivers/target/target_core_spc.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * SCSI Primary Commands (SPC) parsing and emulation.
 *
 * (c) Copyright 2002-2013 Datera, Inc.
 *
 * Nicholas A. Bellinger <nab@kernel.org>
 */

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

#include <scsi/scsi_proto.h>
#include <scsi/scsi_common.h>
#include <scsi/scsi_tcq.h>

#include <target/target_core_base.h>
#include <target/target_core_backend.h>
#include <target/target_core_fabric.h>

#include "target_core_internal.h"
#include "target_core_alua.h"
#include "target_core_pr.h"
#include "target_core_ua.h"
#include "target_core_xcopy.h"

static void spc_fill_alua_data(struct se_lun *lun, unsigned char *buf)
{
	struct t10_alua_tg_pt_gp *tg_pt_gp;

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

	/*
	 * Set TPGS field for explicit and/or implicit ALUA access type
	 * and opteration.
	 *
	 * See spc4r17 section 6.4.2 Table 135
	 */
	spin_lock(&lun->lun_tg_pt_gp_lock);
	tg_pt_gp = lun->lun_tg_pt_gp;
	if (tg_pt_gp)
		buf[5] |= tg_pt_gp->tg_pt_gp_alua_access_type;
	spin_unlock(&lun->lun_tg_pt_gp_lock);
}

static u16
spc_find_scsi_transport_vd(int proto_id)
{
	switch (proto_id) {
	case SCSI_PROTOCOL_FCP:
		return SCSI_VERSION_DESCRIPTOR_FCP4;
	case SCSI_PROTOCOL_ISCSI:
		return SCSI_VERSION_DESCRIPTOR_ISCSI;
	case SCSI_PROTOCOL_SAS:
		return SCSI_VERSION_DESCRIPTOR_SAS3;
	case SCSI_PROTOCOL_SBP