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OpenCloudOS-Kernel/drivers/target/target_core_xcopy.c

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/*******************************************************************************
* 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 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;
}
static int target_xcopy_locate_se_dev_e4(const unsigned char *dev_wwn,
struct se_device **found_dev)
{
struct se_device *se_dev;
unsigned char tmp_dev_wwn[XCOPY_NAA_IEEE_REGEX_LEN];
int rc;
mutex_lock(&g_device_mutex);
list_for_each_entry(se_dev, &g_device_list, g_dev_node) {
if (!se_dev->dev_attrib.emulate_3pc)
continue;
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], dev_wwn, XCOPY_NAA_IEEE_REGEX_LEN);
if (rc != 0)
continue;
*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);
mutex_unlock(&g_device_mutex);
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);
mutex_unlock(&g_device_mutex);
return 0;
}
mutex_unlock(&g_device_mutex);
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[5] & 0x30) != 0x00) {
pr_err("XCOPY 0xe4: association other than LUN not supported\n");
return -EINVAL;
}
if ((desc[5] & 0x0f) != 0x3) {
pr_err("XCOPY 0xe4: designator type unsupported: 0x%02x\n",
(desc[5] & 0x0f));
return -EINVAL;
}
/*
* Check for matching 16 byte length for NAA IEEE Registered Extended
* Assigned designator
*/
desig_len = desc[7];
if (desig_len != 16) {
pr_err("XCOPY 0xe4: invalid desig_len: %d\n", (int)desig_len);
return -EINVAL;
}
pr_debug("XCOPY 0xe4: desig_len: %d\n", (int)desig_len);
/*
* Check for NAA IEEE Registered Extended Assigned header..
*/
if ((desc[8] & 0xf0) != 0x60) {
pr_err("XCOPY 0xe4: Unsupported DESIGNATOR TYPE: 0x%02x\n",
(desc[8] & 0xf0));
return -EINVAL;
}
if (cscd_index != xop->stdi && cscd_index != xop->dtdi) {
pr_debug("XCOPY 0xe4: ignoring CSCD entry %d - neither src nor "
"dest\n", cscd_index);
return 0;
}
if (cscd_index == xop->stdi) {
memcpy(&xop->src_tid_wwn[0], &desc[8], XCOPY_NAA_IEEE_REGEX_LEN);
/*
* Determine if the source designator matches the local device
*/
if (!memcmp(&xop->local_dev_wwn[0], &xop->src_tid_wwn[0],
XCOPY_NAA_IEEE_REGEX_LEN)) {
xop->op_origin = XCOL_SOURCE_RECV_OP;
xop->src_dev = se_cmd->se_dev;
pr_debug("XCOPY 0xe4: Set xop->src_dev %p from source"
" received xop\n", xop->src_dev);
}
}
if (cscd_index == xop->dtdi) {
memcpy(&xop->dst_tid_wwn[0], &desc[8], XCOPY_NAA_IEEE_REGEX_LEN);
/*
* Determine if the destination designator matches the local
* device. If @cscd_index corresponds to both source (stdi) and
* destination (dtdi), or dtdi comes after stdi, then
* XCOL_DEST_RECV_OP wins.
*/
if (!memcmp(&xop->local_dev_wwn[0], &xop->dst_tid_wwn[0],
XCOPY_NAA_IEEE_REGEX_LEN)) {
xop->op_origin = XCOL_DEST_RECV_OP;
xop->dst_dev = se_cmd->se_dev;
pr_debug("XCOPY 0xe4: Set xop->dst_dev: %p from destination"
" received xop\n", xop->dst_dev);
}
}
return 0;
}
static int target_xcopy_parse_target_descriptors(struct se_cmd *se_cmd,
struct xcopy_op *xop, unsigned char *p,
unsigned short tdll, sense_reason_t *sense_ret)
{
struct se_device *local_dev = se_cmd->se_dev;
unsigned char *desc = p;
int offset = tdll % XCOPY_TARGET_DESC_LEN, rc;
unsigned short cscd_index = 0;
unsigned short start = 0;
*sense_ret = TCM_INVALID_PARAMETER_LIST;
if (offset != 0) {
pr_err("XCOPY target descriptor list length is not"
" multiple of %d\n", XCOPY_TARGET_DESC_LEN);
*sense_ret = TCM_UNSUPPORTED_TARGET_DESC_TYPE_CODE;
return -EINVAL;
}
if (tdll > RCR_OP_MAX_TARGET_DESC_COUNT * XCOPY_TARGET_DESC_LEN) {
pr_err("XCOPY target descriptor supports a maximum"
" two src/dest descriptors, tdll: %hu too large..\n", tdll);
/* spc4r37 6.4.3.4 CSCD DESCRIPTOR LIST LENGTH field */
*sense_ret = TCM_TOO_MANY_TARGET_DESCS;
return -EINVAL;
}
/*
* Generate an IEEE Registered Extended designator based upon the
* se_device the XCOPY was received upon..
*/
memset(&xop->local_dev_wwn[0], 0, XCOPY_NAA_IEEE_REGEX_LEN);
target_xcopy_gen_naa_ieee(local_dev, &xop->local_dev_wwn[0]);
while (start < tdll) {
/*
* Check target descriptor identification with 0xE4 type, and
* compare the current index with the CSCD descriptor IDs in
* the segment descriptor. Use VPD 0x83 WWPN matching ..
*/
switch (desc[0]) {
case 0xe4:
rc = target_xcopy_parse_tiddesc_e4(se_cmd, xop,
&desc[0], cscd_index);
if (rc != 0)
goto out;
start += XCOPY_TARGET_DESC_LEN;
desc += XCOPY_TARGET_DESC_LEN;
cscd_index++;
break;
default:
pr_err("XCOPY unsupported descriptor type code:"
" 0x%02x\n", desc[0]);
*sense_ret = TCM_UNSUPPORTED_TARGET_DESC_TYPE_CODE;
goto out;
}
}
switch (xop->op_origin) {
case XCOL_SOURCE_RECV_OP:
rc = target_xcopy_locate_se_dev_e4(xop->dst_tid_wwn,
&xop->dst_dev);
break;
case XCOL_DEST_RECV_OP:
rc = target_xcopy_locate_se_dev_e4(xop->src_tid_wwn,
&xop->src_dev);
break;
default:
pr_err("XCOPY CSCD descriptor IDs not found in CSCD list - "
"stdi: %hu dtdi: %hu\n", xop->stdi, xop->dtdi);
rc = -EINVAL;
break;
}
/*
* If a matching IEEE NAA 0x83 descriptor for the requested device
* is not located on this node, return COPY_ABORTED with ASQ/ASQC
* 0x0d/0x02 - COPY_TARGET_DEVICE_NOT_REACHABLE to request the
* initiator to fall back to normal copy method.
*/
if (rc < 0) {
*sense_ret = TCM_COPY_TARGET_DEVICE_NOT_REACHABLE;
goto out;
}
pr_debug("XCOPY TGT desc: Source dev: %p NAA IEEE WWN: 0x%16phN\n",
xop->src_dev, &xop->src_tid_wwn[0]);
pr_debug("XCOPY TGT desc: Dest dev: %p NAA IEEE WWN: 0x%16phN\n",
xop->dst_dev, &xop->dst_tid_wwn[0]);
return cscd_index;
out:
return -EINVAL;
}
static int target_xcopy_parse_segdesc_02(struct se_cmd *se_cmd, struct xcopy_op *xop,
unsigned char *p)
{
unsigned char *desc = p;
int dc = (desc[1] & 0x02);
unsigned short desc_len;
desc_len = get_unaligned_be16(&desc[2]);
if (desc_len != 0x18) {
pr_err("XCOPY segment desc 0x02: Illegal desc_len:"
" %hu\n", desc_len);
return -EINVAL;
}
xop->stdi = get_unaligned_be16(&desc[4]);
xop->dtdi = get_unaligned_be16(&desc[6]);
if (xop->stdi > XCOPY_CSCD_DESC_ID_LIST_OFF_MAX ||
xop->dtdi > XCOPY_CSCD_DESC_ID_LIST_OFF_MAX) {
pr_err("XCOPY segment desc 0x02: unsupported CSCD ID > 0x%x; stdi: %hu dtdi: %hu\n",
XCOPY_CSCD_DESC_ID_LIST_OFF_MAX, xop->stdi, xop->dtdi);
return -EINVAL;
}
pr_debug("XCOPY seg desc 0x02: desc_len: %hu stdi: %hu dtdi: %hu, DC: %d\n",
desc_len, xop->stdi, xop->dtdi, dc);
xop->nolb = get_unaligned_be16(&desc[10]);
xop->src_lba = get_unaligned_be64(&desc[12]);
xop->dst_lba = get_unaligned_be64(&desc[20]);
pr_debug("XCOPY seg desc 0x02: nolb: %hu src_lba: %llu dst_lba: %llu\n",
xop->nolb, (unsigned long long)xop->src_lba,
(unsigned long long)xop->dst_lba);
if (dc != 0) {
xop->dbl = (desc[29] & 0xff) << 16;
xop->dbl |= (desc[30] & 0xff) << 8;
xop->dbl |= desc[31] & 0xff;
pr_debug("XCOPY seg desc 0x02: DC=1 w/ dbl: %u\n", xop->dbl);
}
return 0;
}
static int target_xcopy_parse_segment_descriptors(struct se_cmd *se_cmd,
struct xcopy_op *xop, unsigned char *p,
unsigned int sdll, sense_reason_t *sense_ret)
{
unsigned char *desc = p;
unsigned int start = 0;
int offset = sdll % XCOPY_SEGMENT_DESC_LEN, rc, ret = 0;
*sense_ret = TCM_INVALID_PARAMETER_LIST;
if (offset != 0) {
pr_err("XCOPY segment descriptor list length is not"
" multiple of %d\n", XCOPY_SEGMENT_DESC_LEN);
*sense_ret = TCM_UNSUPPORTED_SEGMENT_DESC_TYPE_CODE;
return -EINVAL;
}
if (sdll > RCR_OP_MAX_SG_DESC_COUNT * XCOPY_SEGMENT_DESC_LEN) {
pr_err("XCOPY supports %u segment descriptor(s), sdll: %u too"
" large..\n", RCR_OP_MAX_SG_DESC_COUNT, sdll);
/* spc4r37 6.4.3.5 SEGMENT DESCRIPTOR LIST LENGTH field */
*sense_ret = TCM_TOO_MANY_SEGMENT_DESCS;
return -EINVAL;
}
while (start < sdll) {
/*
* Check segment descriptor type code for block -> block
*/
switch (desc[0]) {
case 0x02:
rc = target_xcopy_parse_segdesc_02(se_cmd, xop, desc);
if (rc < 0)
goto out;
ret++;
start += XCOPY_SEGMENT_DESC_LEN;
desc += XCOPY_SEGMENT_DESC_LEN;
break;
default:
pr_err("XCOPY unsupported segment descriptor"
"type: 0x%02x\n", desc[0]);
*sense_ret = TCM_UNSUPPORTED_SEGMENT_DESC_TYPE_CODE;
goto out;
}
}
return ret;
out:
return -EINVAL;
}
/*
* Start xcopy_pt ops
*/
struct xcopy_pt_cmd {
bool remote_port;
struct se_cmd se_cmd;
struct xcopy_op *xcopy_op;
struct completion xpt_passthrough_sem;
unsigned char sense_buffer[TRANSPORT_SENSE_BUFFER];
};
struct se_portal_group xcopy_pt_tpg;
static struct se_session xcopy_pt_sess;
static struct se_node_acl xcopy_pt_nacl;
static char *xcopy_pt_get_fabric_name(void)
{
return "xcopy-pt";
}
static int xcopy_pt_get_cmd_state(struct se_cmd *se_cmd)
{
return 0;
}
static void xcopy_pt_undepend_remotedev(struct xcopy_op *xop)
{
struct se_device *remote_dev;
if (xop->op_origin == XCOL_SOURCE_RECV_OP)
remote_dev = xop->dst_dev;
else
remote_dev = xop->src_dev;
pr_debug("Calling configfs_undepend_item for"
" remote_dev: %p remote_dev->dev_group: %p\n",
remote_dev, &remote_dev->dev_group.cg_item);
target_undepend_item(&remote_dev->dev_group.cg_item);
}
static void xcopy_pt_release_cmd(struct se_cmd *se_cmd)
{
struct xcopy_pt_cmd *xpt_cmd = container_of(se_cmd,
struct xcopy_pt_cmd, se_cmd);
kfree(xpt_cmd);
}
static int xcopy_pt_check_stop_free(struct se_cmd *se_cmd)
{
struct xcopy_pt_cmd *xpt_cmd = container_of(se_cmd,
struct xcopy_pt_cmd, se_cmd);
complete(&xpt_cmd->xpt_passthrough_sem);
return 0;
}
static int xcopy_pt_write_pending(struct se_cmd *se_cmd)
{
return 0;
}
static int xcopy_pt_write_pending_status(struct se_cmd *se_cmd)
{
return 0;
}
static int xcopy_pt_queue_data_in(struct se_cmd *se_cmd)
{
return 0;
}
static int xcopy_pt_queue_status(struct se_cmd *se_cmd)
{
return 0;
}
static const struct target_core_fabric_ops xcopy_pt_tfo = {
.get_fabric_name = xcopy_pt_get_fabric_name,
.get_cmd_state = xcopy_pt_get_cmd_state,
.release_cmd = xcopy_pt_release_cmd,
.check_stop_free = xcopy_pt_check_stop_free,
.write_pending = xcopy_pt_write_pending,
.write_pending_status = xcopy_pt_write_pending_status,
.queue_data_in = xcopy_pt_queue_data_in,
.queue_status = xcopy_pt_queue_status,
};
/*
* End xcopy_pt_ops
*/
int target_xcopy_setup_pt(void)
{
xcopy_wq = alloc_workqueue("xcopy_wq", WQ_MEM_RECLAIM, 0);
if (!xcopy_wq) {
pr_err("Unable to allocate xcopy_wq\n");
return -ENOMEM;
}
memset(&xcopy_pt_tpg, 0, sizeof(struct se_portal_group));
INIT_LIST_HEAD(&xcopy_pt_tpg.se_tpg_node);
INIT_LIST_HEAD(&xcopy_pt_tpg.acl_node_list);
INIT_LIST_HEAD(&xcopy_pt_tpg.tpg_sess_list);
xcopy_pt_tpg.se_tpg_tfo = &xcopy_pt_tfo;
memset(&xcopy_pt_nacl, 0, sizeof(struct se_node_acl));
INIT_LIST_HEAD(&xcopy_pt_nacl.acl_list);
INIT_LIST_HEAD(&xcopy_pt_nacl.acl_sess_list);
memset(&xcopy_pt_sess, 0, sizeof(struct se_session));
INIT_LIST_HEAD(&xcopy_pt_sess.sess_list);
INIT_LIST_HEAD(&xcopy_pt_sess.sess_acl_list);
INIT_LIST_HEAD(&xcopy_pt_sess.sess_cmd_list);
spin_lock_init(&xcopy_pt_sess.sess_cmd_lock);
xcopy_pt_nacl.se_tpg = &xcopy_pt_tpg;
xcopy_pt_nacl.nacl_sess = &xcopy_pt_sess;
xcopy_pt_sess.se_tpg = &xcopy_pt_tpg;
xcopy_pt_sess.se_node_acl = &xcopy_pt_nacl;
return 0;
}
void target_xcopy_release_pt(void)
{
if (xcopy_wq)
destroy_workqueue(xcopy_wq);
}
static void target_xcopy_setup_pt_port(
struct xcopy_pt_cmd *xpt_cmd,
struct xcopy_op *xop,
bool remote_port)
{
struct se_cmd *ec_cmd = xop->xop_se_cmd;
struct se_cmd *pt_cmd = &xpt_cmd->se_cmd;
if (xop->op_origin == XCOL_SOURCE_RECV_OP) {
/*
* Honor destination port reservations for X-COPY PUSH emulation
* when CDB is received on local source port, and READs blocks to
* WRITE on remote destination port.
*/
if (remote_port) {
xpt_cmd->remote_port = remote_port;
} else {
pt_cmd->se_lun = ec_cmd->se_lun;
pt_cmd->se_dev = ec_cmd->se_dev;
pr_debug("Honoring local SRC port from ec_cmd->se_dev:"
" %p\n", pt_cmd->se_dev);
pt_cmd->se_lun = ec_cmd->se_lun;
pr_debug("Honoring local SRC port from ec_cmd->se_lun: %p\n",
pt_cmd->se_lun);
}
} else {
/*
* Honor source port reservation for X-COPY PULL emulation
* when CDB is received on local desintation port, and READs
* blocks from the remote source port to WRITE on local
* destination port.
*/
if (remote_port) {
xpt_cmd->remote_port = remote_port;
} else {
pt_cmd->se_lun = ec_cmd->se_lun;
pt_cmd->se_dev = ec_cmd->se_dev;
pr_debug("Honoring local DST port from ec_cmd->se_dev:"
" %p\n", pt_cmd->se_dev);
pt_cmd->se_lun = ec_cmd->se_lun;
pr_debug("Honoring local DST port from ec_cmd->se_lun: %p\n",
pt_cmd->se_lun);
}
}
}
static void target_xcopy_init_pt_lun(struct se_device *se_dev,
struct se_cmd *pt_cmd, bool remote_port)
{
/*
* Don't allocate + init an pt_cmd->se_lun if honoring local port for
* reservations. The pt_cmd->se_lun pointer will be setup from within
* target_xcopy_setup_pt_port()
*/
if (remote_port) {
pr_debug("Setup emulated se_dev: %p from se_dev\n",
pt_cmd->se_dev);
pt_cmd->se_lun = &se_dev->xcopy_lun;
pt_cmd->se_dev = se_dev;
}
pt_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
}
static int target_xcopy_setup_pt_cmd(
struct xcopy_pt_cmd *xpt_cmd,
struct xcopy_op *xop,
struct se_device *se_dev,
unsigned char *cdb,
bool remote_port,
bool alloc_mem)
{
struct se_cmd *cmd = &xpt_cmd->se_cmd;
sense_reason_t sense_rc;
int ret = 0, rc;
/*
* Setup LUN+port to honor reservations based upon xop->op_origin for
* X-COPY PUSH or X-COPY PULL based upon where the CDB was received.
*/
target_xcopy_init_pt_lun(se_dev, cmd, remote_port);
xpt_cmd->xcopy_op = xop;
target_xcopy_setup_pt_port(xpt_cmd, xop, remote_port);
cmd->tag = 0;
sense_rc = target_setup_cmd_from_cdb(cmd, cdb);
if (sense_rc) {
ret = -EINVAL;
goto out;
}
if (alloc_mem) {
rc = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents,
cmd->data_length, false, false);
if (rc < 0) {
ret = rc;
goto out;
}
/*
* Set this bit so that transport_free_pages() allows the
* caller to release SGLs + physical memory allocated by
* transport_generic_get_mem()..
*/
cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
} else {
/*
* Here the previously allocated SGLs for the internal READ
* are mapped zero-copy to the internal WRITE.
*/
sense_rc = transport_generic_map_mem_to_cmd(cmd,
xop->xop_data_sg, xop->xop_data_nents,
NULL, 0);
if (sense_rc) {
ret = -EINVAL;
goto out;
}
pr_debug("Setup PASSTHROUGH_NOALLOC t_data_sg: %p t_data_nents:"
" %u\n", cmd->t_data_sg, cmd->t_data_nents);
}
return 0;
out:
return ret;
}
static int target_xcopy_issue_pt_cmd(struct xcopy_pt_cmd *xpt_cmd)
{
struct se_cmd *se_cmd = &xpt_cmd->se_cmd;
sense_reason_t sense_rc;
sense_rc = transport_generic_new_cmd(se_cmd);
if (sense_rc)
return -EINVAL;
if (se_cmd->data_direction == DMA_TO_DEVICE)
target_execute_cmd(se_cmd);
wait_for_completion_interruptible(&xpt_cmd->xpt_passthrough_sem);
pr_debug("target_xcopy_issue_pt_cmd(): SCSI status: 0x%02x\n",
se_cmd->scsi_status);
return (se_cmd->scsi_status) ? -EINVAL : 0;
}
static int target_xcopy_read_source(
struct se_cmd *ec_cmd,
struct xcopy_op *xop,
struct se_device *src_dev,
sector_t src_lba,
u32 src_sectors)
{
struct xcopy_pt_cmd *xpt_cmd;
struct se_cmd *se_cmd;
u32 length = (src_sectors * src_dev->dev_attrib.block_size);
int rc;
unsigned char cdb[16];
bool remote_port = (xop->op_origin == XCOL_DEST_RECV_OP);
xpt_cmd = kzalloc(sizeof(struct xcopy_pt_cmd), GFP_KERNEL);
if (!xpt_cmd) {
pr_err("Unable to allocate xcopy_pt_cmd\n");
return -ENOMEM;
}
init_completion(&xpt_cmd->xpt_passthrough_sem);
se_cmd = &xpt_cmd->se_cmd;
memset(&cdb[0], 0, 16);
cdb[0] = READ_16;
put_unaligned_be64(src_lba, &cdb[2]);
put_unaligned_be32(src_sectors, &cdb[10]);
pr_debug("XCOPY: Built READ_16: LBA: %llu Sectors: %u Length: %u\n",
(unsigned long long)src_lba, src_sectors, length);
transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, &xcopy_pt_sess, length,
DMA_FROM_DEVICE, 0, &xpt_cmd->sense_buffer[0]);
xop->src_pt_cmd = xpt_cmd;
rc = target_xcopy_setup_pt_cmd(xpt_cmd, xop, src_dev, &cdb[0],
remote_port, true);
if (rc < 0) {
ec_cmd->scsi_status = xpt_cmd->se_cmd.scsi_status;
transport_generic_free_cmd(se_cmd, 0);
return rc;
}
xop->xop_data_sg = se_cmd->t_data_sg;
xop->xop_data_nents = se_cmd->t_data_nents;
pr_debug("XCOPY-READ: Saved xop->xop_data_sg: %p, num: %u for READ"
" memory\n", xop->xop_data_sg, xop->xop_data_nents);
rc = target_xcopy_issue_pt_cmd(xpt_cmd);
if (rc < 0) {
ec_cmd->scsi_status = xpt_cmd->se_cmd.scsi_status;
transport_generic_free_cmd(se_cmd, 0);
return rc;
}
/*
* Clear off the allocated t_data_sg, that has been saved for
* zero-copy WRITE submission reuse in struct xcopy_op..
*/
se_cmd->t_data_sg = NULL;
se_cmd->t_data_nents = 0;
return 0;
}
static int target_xcopy_write_destination(
struct se_cmd *ec_cmd,
struct xcopy_op *xop,
struct se_device *dst_dev,
sector_t dst_lba,
u32 dst_sectors)
{
struct xcopy_pt_cmd *xpt_cmd;
struct se_cmd *se_cmd;
u32 length = (dst_sectors * dst_dev->dev_attrib.block_size);
int rc;
unsigned char cdb[16];
bool remote_port = (xop->op_origin == XCOL_SOURCE_RECV_OP);
xpt_cmd = kzalloc(sizeof(struct xcopy_pt_cmd), GFP_KERNEL);
if (!xpt_cmd) {
pr_err("Unable to allocate xcopy_pt_cmd\n");
return -ENOMEM;
}
init_completion(&xpt_cmd->xpt_passthrough_sem);
se_cmd = &xpt_cmd->se_cmd;
memset(&cdb[0], 0, 16);
cdb[0] = WRITE_16;
put_unaligned_be64(dst_lba, &cdb[2]);
put_unaligned_be32(dst_sectors, &cdb[10]);
pr_debug("XCOPY: Built WRITE_16: LBA: %llu Sectors: %u Length: %u\n",
(unsigned long long)dst_lba, dst_sectors, length);
transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, &xcopy_pt_sess, length,
DMA_TO_DEVICE, 0, &xpt_cmd->sense_buffer[0]);
xop->dst_pt_cmd = xpt_cmd;
rc = target_xcopy_setup_pt_cmd(xpt_cmd, xop, dst_dev, &cdb[0],
remote_port, false);
if (rc < 0) {
struct se_cmd *src_cmd = &xop->src_pt_cmd->se_cmd;
ec_cmd->scsi_status = xpt_cmd->se_cmd.scsi_status;
/*
* If the failure happened before the t_mem_list hand-off in
* target_xcopy_setup_pt_cmd(), Reset memory + clear flag so that
* core releases this memory on error during X-COPY WRITE I/O.
*/
src_cmd->se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
src_cmd->t_data_sg = xop->xop_data_sg;
src_cmd->t_data_nents = xop->xop_data_nents;
transport_generic_free_cmd(se_cmd, 0);
return rc;
}
rc = target_xcopy_issue_pt_cmd(xpt_cmd);
if (rc < 0) {
ec_cmd->scsi_status = xpt_cmd->se_cmd.scsi_status;
se_cmd->se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
transport_generic_free_cmd(se_cmd, 0);
return rc;
}
return 0;
}
static void target_xcopy_do_work(struct work_struct *work)
{
struct xcopy_op *xop = container_of(work, struct xcopy_op, xop_work);
struct se_device *src_dev = xop->src_dev, *dst_dev = xop->dst_dev;
struct se_cmd *ec_cmd = xop->xop_se_cmd;
sector_t src_lba = xop->src_lba, dst_lba = xop->dst_lba, end_lba;
unsigned int max_sectors;
int rc;
unsigned short nolb = xop->nolb, cur_nolb, max_nolb, copied_nolb = 0;
end_lba = src_lba + nolb;
/*
* Break up XCOPY I/O into hw_max_sectors sized I/O based on the
* smallest max_sectors between src_dev + dev_dev, or
*/
max_sectors = min(src_dev->dev_attrib.hw_max_sectors,
dst_dev->dev_attrib.hw_max_sectors);
max_sectors = min_t(u32, max_sectors, XCOPY_MAX_SECTORS);
max_nolb = min_t(u16, max_sectors, ((u16)(~0U)));
pr_debug("target_xcopy_do_work: nolb: %hu, max_nolb: %hu end_lba: %llu\n",
nolb, max_nolb, (unsigned long long)end_lba);
pr_debug("target_xcopy_do_work: Starting src_lba: %llu, dst_lba: %llu\n",
(unsigned long long)src_lba, (unsigned long long)dst_lba);
while (src_lba < end_lba) {
cur_nolb = min(nolb, max_nolb);
pr_debug("target_xcopy_do_work: Calling read src_dev: %p src_lba: %llu,"
" cur_nolb: %hu\n", src_dev, (unsigned long long)src_lba, cur_nolb);
rc = target_xcopy_read_source(ec_cmd, xop, src_dev, src_lba, cur_nolb);
if (rc < 0)
goto out;
src_lba += cur_nolb;
pr_debug("target_xcopy_do_work: Incremented READ src_lba to %llu\n",
(unsigned long long)src_lba);
pr_debug("target_xcopy_do_work: Calling write dst_dev: %p dst_lba: %llu,"
" cur_nolb: %hu\n", dst_dev, (unsigned long long)dst_lba, cur_nolb);
rc = target_xcopy_write_destination(ec_cmd, xop, dst_dev,
dst_lba, cur_nolb);
if (rc < 0) {
transport_generic_free_cmd(&xop->src_pt_cmd->se_cmd, 0);
goto out;
}
dst_lba += cur_nolb;
pr_debug("target_xcopy_do_work: Incremented WRITE dst_lba to %llu\n",
(unsigned long long)dst_lba);
copied_nolb += cur_nolb;
nolb -= cur_nolb;
transport_generic_free_cmd(&xop->src_pt_cmd->se_cmd, 0);
xop->dst_pt_cmd->se_cmd.se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
transport_generic_free_cmd(&xop->dst_pt_cmd->se_cmd, 0);
}
xcopy_pt_undepend_remotedev(xop);
kfree(xop);
pr_debug("target_xcopy_do_work: Final src_lba: %llu, dst_lba: %llu\n",
(unsigned long long)src_lba, (unsigned long long)dst_lba);
pr_debug("target_xcopy_do_work: Blocks copied: %hu, Bytes Copied: %u\n",
copied_nolb, copied_nolb * dst_dev->dev_attrib.block_size);
pr_debug("target_xcopy_do_work: Setting X-COPY GOOD status -> sending response\n");
target_complete_cmd(ec_cmd, SAM_STAT_GOOD);
return;
out:
xcopy_pt_undepend_remotedev(xop);
kfree(xop);
/*
* Don't override an error scsi status if it has already been set
*/
if (ec_cmd->scsi_status == SAM_STAT_GOOD) {
pr_warn_ratelimited("target_xcopy_do_work: rc: %d, Setting X-COPY"
" CHECK_CONDITION -> sending response\n", rc);
ec_cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
}
target_complete_cmd(ec_cmd, ec_cmd->scsi_status);
}
sense_reason_t target_do_xcopy(struct se_cmd *se_cmd)
{
struct se_device *dev = se_cmd->se_dev;
struct xcopy_op *xop = NULL;
unsigned char *p = NULL, *seg_desc;
unsigned int list_id, list_id_usage, sdll, inline_dl, sa;
sense_reason_t ret = TCM_INVALID_PARAMETER_LIST;
int rc;
unsigned short tdll;
if (!dev->dev_attrib.emulate_3pc) {
pr_err("EXTENDED_COPY operation explicitly disabled\n");
return TCM_UNSUPPORTED_SCSI_OPCODE;
}
sa = se_cmd->t_task_cdb[1] & 0x1f;
if (sa != 0x00) {
pr_err("EXTENDED_COPY(LID4) not supported\n");
return TCM_UNSUPPORTED_SCSI_OPCODE;
}
if (se_cmd->data_length == 0) {
target_complete_cmd(se_cmd, SAM_STAT_GOOD);
return TCM_NO_SENSE;
}
if (se_cmd->data_length < XCOPY_HDR_LEN) {
pr_err("XCOPY parameter truncation: length %u < hdr_len %u\n",
se_cmd->data_length, XCOPY_HDR_LEN);
return TCM_PARAMETER_LIST_LENGTH_ERROR;
}
xop = kzalloc(sizeof(struct xcopy_op), GFP_KERNEL);
if (!xop) {
pr_err("Unable to allocate xcopy_op\n");
return TCM_OUT_OF_RESOURCES;
}
xop->xop_se_cmd = se_cmd;
p = transport_kmap_data_sg(se_cmd);
if (!p) {
pr_err("transport_kmap_data_sg() failed in target_do_xcopy\n");
kfree(xop);
return TCM_OUT_OF_RESOURCES;
}
list_id = p[0];
list_id_usage = (p[1] & 0x18) >> 3;
/*
* Determine TARGET DESCRIPTOR LIST LENGTH + SEGMENT DESCRIPTOR LIST LENGTH
*/
tdll = get_unaligned_be16(&p[2]);
sdll = get_unaligned_be32(&p[8]);
if (tdll + sdll > RCR_OP_MAX_DESC_LIST_LEN) {
pr_err("XCOPY descriptor list length %u exceeds maximum %u\n",
tdll + sdll, RCR_OP_MAX_DESC_LIST_LEN);
ret = TCM_PARAMETER_LIST_LENGTH_ERROR;
goto out;
}
inline_dl = get_unaligned_be32(&p[12]);
if (inline_dl != 0) {
pr_err("XCOPY with non zero inline data length\n");
goto out;
}
if (se_cmd->data_length < (XCOPY_HDR_LEN + tdll + sdll + inline_dl)) {
pr_err("XCOPY parameter truncation: data length %u too small "
"for tdll: %hu sdll: %u inline_dl: %u\n",
se_cmd->data_length, tdll, sdll, inline_dl);
ret = TCM_PARAMETER_LIST_LENGTH_ERROR;
goto out;
}
pr_debug("Processing XCOPY with list_id: 0x%02x list_id_usage: 0x%02x"
" tdll: %hu sdll: %u inline_dl: %u\n", list_id, list_id_usage,
tdll, sdll, inline_dl);
/*
* skip over the target descriptors until segment descriptors
* have been passed - CSCD ids are needed to determine src and dest.
*/
seg_desc = &p[16] + tdll;
rc = target_xcopy_parse_segment_descriptors(se_cmd, xop, seg_desc,
sdll, &ret);
if (rc <= 0)
goto out;
pr_debug("XCOPY: Processed %d segment descriptors, length: %u\n", rc,
rc * XCOPY_SEGMENT_DESC_LEN);
rc = target_xcopy_parse_target_descriptors(se_cmd, xop, &p[16], tdll, &ret);
if (rc <= 0)
goto out;
if (xop->src_dev->dev_attrib.block_size !=
xop->dst_dev->dev_attrib.block_size) {
pr_err("XCOPY: Non matching src_dev block_size: %u + dst_dev"
" block_size: %u currently unsupported\n",
xop->src_dev->dev_attrib.block_size,
xop->dst_dev->dev_attrib.block_size);
xcopy_pt_undepend_remotedev(xop);
ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
goto out;
}
pr_debug("XCOPY: Processed %d target descriptors, length: %u\n", rc,
rc * XCOPY_TARGET_DESC_LEN);
transport_kunmap_data_sg(se_cmd);
INIT_WORK(&xop->xop_work, target_xcopy_do_work);
queue_work(xcopy_wq, &xop->xop_work);
return TCM_NO_SENSE;
out:
if (p)
transport_kunmap_data_sg(se_cmd);
kfree(xop);
return ret;
}
static sense_reason_t target_rcr_operating_parameters(struct se_cmd *se_cmd)
{
unsigned char *p;
p = transport_kmap_data_sg(se_cmd);
if (!p) {
pr_err("transport_kmap_data_sg failed in"
" target_rcr_operating_parameters\n");
return TCM_OUT_OF_RESOURCES;
}
if (se_cmd->data_length < 54) {
pr_err("Receive Copy Results Op Parameters length"
" too small: %u\n", se_cmd->data_length);
transport_kunmap_data_sg(se_cmd);
return TCM_INVALID_CDB_FIELD;
}
/*
* Set SNLID=1 (Supports no List ID)
*/
p[4] = 0x1;
/*
* MAXIMUM TARGET DESCRIPTOR COUNT
*/
put_unaligned_be16(RCR_OP_MAX_TARGET_DESC_COUNT, &p[8]);
/*
* MAXIMUM SEGMENT DESCRIPTOR COUNT
*/
put_unaligned_be16(RCR_OP_MAX_SG_DESC_COUNT, &p[10]);
/*
* MAXIMUM DESCRIPTOR LIST LENGTH
*/
put_unaligned_be32(RCR_OP_MAX_DESC_LIST_LEN, &p[12]);
/*
* MAXIMUM SEGMENT LENGTH
*/
put_unaligned_be32(RCR_OP_MAX_SEGMENT_LEN, &p[16]);
/*
* MAXIMUM INLINE DATA LENGTH for SA 0x04 (NOT SUPPORTED)
*/
put_unaligned_be32(0x0, &p[20]);
/*
* HELD DATA LIMIT
*/
put_unaligned_be32(0x0, &p[24]);
/*
* MAXIMUM STREAM DEVICE TRANSFER SIZE
*/
put_unaligned_be32(0x0, &p[28]);
/*
* TOTAL CONCURRENT COPIES
*/
put_unaligned_be16(RCR_OP_TOTAL_CONCURR_COPIES, &p[34]);
/*
* MAXIMUM CONCURRENT COPIES
*/
p[36] = RCR_OP_MAX_CONCURR_COPIES;
/*
* DATA SEGMENT GRANULARITY (log 2)
*/
p[37] = RCR_OP_DATA_SEG_GRAN_LOG2;
/*
* INLINE DATA GRANULARITY log 2)
*/
p[38] = RCR_OP_INLINE_DATA_GRAN_LOG2;
/*
* HELD DATA GRANULARITY
*/
p[39] = RCR_OP_HELD_DATA_GRAN_LOG2;
/*
* IMPLEMENTED DESCRIPTOR LIST LENGTH
*/
p[43] = 0x2;
/*
* List of implemented descriptor type codes (ordered)
*/
p[44] = 0x02; /* Copy Block to Block device */
p[45] = 0xe4; /* Identification descriptor target descriptor */
/*
* AVAILABLE DATA (n-3)
*/
put_unaligned_be32(42, &p[0]);
transport_kunmap_data_sg(se_cmd);
target_complete_cmd(se_cmd, GOOD);
return TCM_NO_SENSE;
}
sense_reason_t target_do_receive_copy_results(struct se_cmd *se_cmd)
{
unsigned char *cdb = &se_cmd->t_task_cdb[0];
int sa = (cdb[1] & 0x1f), list_id = cdb[2];
sense_reason_t rc = TCM_NO_SENSE;
pr_debug("Entering target_do_receive_copy_results: SA: 0x%02x, List ID:"
" 0x%02x, AL: %u\n", sa, list_id, se_cmd->data_length);
if (list_id != 0) {
pr_err("Receive Copy Results with non zero list identifier"
" not supported\n");
return TCM_INVALID_CDB_FIELD;
}
switch (sa) {
case RCR_SA_OPERATING_PARAMETERS:
rc = target_rcr_operating_parameters(se_cmd);
break;
case RCR_SA_COPY_STATUS:
case RCR_SA_RECEIVE_DATA:
case RCR_SA_FAILED_SEGMENT_DETAILS:
default:
pr_err("Unsupported SA for receive copy results: 0x%02x\n", sa);
return TCM_INVALID_CDB_FIELD;
}
return rc;
}
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