/*******************************************************************************
* Filename: target_core_xcopy.c
*
* This file contains support for SPC-4 Extended-Copy offload with generic
* TCM backends.
*
* Copyright (c) 2011-2013 Datera, Inc. All rights reserved.
*
* Author:
* Nicholas A. Bellinger <nab@daterainc.com>
*
* 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/slab.h>
#include <linux/spinlock.h>
#include <linux/list.h>
#include <linux/configfs.h>
#include <linux/ratelimit.h>
#include <scsi/scsi_proto.h>
#include <asm/unaligned.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_pr.h"
#include "target_core_ua.h"
#include "target_core_xcopy.h"
static struct workqueue_struct *xcopy_wq = NULL;
static sense_reason_t target_parse_xcopy_cmd(struct xcopy_op *xop);
static int target_xcopy_gen_naa_ieee(struct se_device *dev, unsigned char *buf)
{
int off = 0;
buf[off++] = (0x6 << 4);
buf[off++] = 0x01;
buf[off++] = 0x40;
buf[off] = (0x5 << 4);
spc_parse_naa_6h_vendor_specific(dev, &buf[off]);
return 0;
}
struct xcopy_dev_search_info {
const unsigned char *dev_wwn;
struct se_device *found_dev;
};
static int target_xcopy_locate_se_dev_e4_iter(struct se_device *se_dev,
void *data)
{
struct xcopy_dev_search_info *info = data;
unsigned char tmp_dev_wwn[XCOPY_NAA_IEEE_REGEX_LEN];
int rc;
if (!se_dev->dev_attrib.emulate_3pc)
return 0;
memset(&tmp_dev_wwn[0], 0, XCOPY_NAA_IEEE_REGEX_LEN);
target_xcopy_gen_naa_ieee(se_dev, &tmp_dev_wwn[0]);
rc = memcmp(&tmp_dev_wwn[0], info->dev_wwn, XCOPY_NAA_IEEE_REGEX_LEN);
if (rc != 0)
return 0;
info->found_dev = se_dev;
pr_debug("XCOPY 0xe4: located se_dev: %p\n", se_dev);
rc = target_depend_item(&se_dev->dev_group.cg_item);
if (rc != 0) {
pr_err("configfs_depend_item attempt failed: %d for se_dev: %p\n",
rc, se_dev);
return rc;
}
pr_debug("Called configfs_depend_item for se_dev: %p se_dev->se_dev_group: %p\n",
se_dev, &se_dev->dev_group);
return 1;
}
static int target_xcopy_locate_se_dev_e4(const unsigned char *dev_wwn,
struct se_device **found_dev)
{
struct xcopy_dev_search_info info;
int ret;
memset(&info, 0, sizeof(info));
info.dev_wwn = dev_wwn;
ret = target_for_each_device(target_xcopy_locate_se_dev_e4_iter, &info);
if (ret == 1) {
*found_dev = info.found_dev;
return 0;
} else {
pr_debug_ratelimited("Unable to locate 0xe4 descriptor for EXTENDED_COPY\n");
return -EINVAL;
}
}
static int target_xcopy_parse_tiddesc_e4(struct se_cmd *se_cmd, struct xcopy_op *xop,
unsigned char *p, unsigned short cscd_index)
{
unsigned char *desc = p;
unsigned short ript;
u8 desig_len;
/*
* Extract RELATIVE INITIATOR PORT IDENTIFIER
*/
ript = get_unaligned_be16(&desc[2]);
pr_debug("XCOPY 0xe4: RELATIVE INITIATOR PORT IDENTIFIER: %hu\n", ript);
/*
* Check for supported code set, association, and designator type
*/
if ((desc[4] & 0x0f) != 0x1) {
pr_err("XCOPY 0xe4: code set of non binary type not supported\n");
return -EINVAL;
}
if ((desc