target_core_xcopy.c 27.1 KB
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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>
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#include <scsi/scsi_proto.h>
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#include <asm/unaligned.h>

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

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#include "target_core_internal.h"
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#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(struct se_cmd *se_cmd, struct xcopy_op *xop,
					bool src)
{
	struct se_device *se_dev;
	unsigned char tmp_dev_wwn[XCOPY_NAA_IEEE_REGEX_LEN], *dev_wwn;
	int rc;

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	if (src)
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		dev_wwn = &xop->dst_tid_wwn[0];
	else
		dev_wwn = &xop->src_tid_wwn[0];

	mutex_lock(&g_device_mutex);
	list_for_each_entry(se_dev, &g_device_list, g_dev_node) {

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		if (!se_dev->dev_attrib.emulate_3pc)
			continue;

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		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;

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		if (src) {
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			xop->dst_dev = se_dev;
			pr_debug("XCOPY 0xe4: Setting xop->dst_dev: %p from located"
				" se_dev\n", xop->dst_dev);
		} else {
			xop->src_dev = se_dev;
			pr_debug("XCOPY 0xe4: Setting xop->src_dev: %p from located"
				" se_dev\n", xop->src_dev);
		}

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		rc = target_depend_item(&se_dev->dev_group.cg_item);
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		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;
		}

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		pr_debug("Called configfs_depend_item for se_dev: %p"
			" se_dev->se_dev_group: %p\n", se_dev,
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			&se_dev->dev_group);

		mutex_unlock(&g_device_mutex);
		return 0;
	}
	mutex_unlock(&g_device_mutex);

	pr_err("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, bool src)
{
	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;
	}

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	if (src) {
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		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);
		}
	} else {
		memcpy(&xop->dst_tid_wwn[0], &desc[8], XCOPY_NAA_IEEE_REGEX_LEN);
		/*
		 * Determine if the destination designator matches the local device
		 */
		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)
{
	struct se_device *local_dev = se_cmd->se_dev;
	unsigned char *desc = p;
	int offset = tdll % XCOPY_TARGET_DESC_LEN, rc, ret = 0;
	unsigned short start = 0;
	bool src = true;

	if (offset != 0) {
		pr_err("XCOPY target descriptor list length is not"
			" multiple of %d\n", XCOPY_TARGET_DESC_LEN);
		return -EINVAL;
	}
	if (tdll > 64) {
		pr_err("XCOPY target descriptor supports a maximum"
			" two src/dest descriptors, tdll: %hu too large..\n", tdll);
		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 with
		 * use VPD 0x83 WWPN matching ..
		 */
		switch (desc[0]) {
		case 0xe4:
			rc = target_xcopy_parse_tiddesc_e4(se_cmd, xop,
							&desc[0], src);
			if (rc != 0)
				goto out;
			/*
			 * Assume target descriptors are in source -> destination order..
			 */
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			if (src)
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				src = false;
			else
				src = true;
			start += XCOPY_TARGET_DESC_LEN;
			desc += XCOPY_TARGET_DESC_LEN;
			ret++;
			break;
		default:
			pr_err("XCOPY unsupported descriptor type code:"
					" 0x%02x\n", desc[0]);
			goto out;
		}
	}

	if (xop->op_origin == XCOL_SOURCE_RECV_OP)
		rc = target_xcopy_locate_se_dev_e4(se_cmd, xop, true);
	else
		rc = target_xcopy_locate_se_dev_e4(se_cmd, xop, false);

	if (rc < 0)
		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 ret;

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]);
	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) {
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		xop->dbl = (desc[29] & 0xff) << 16;
		xop->dbl |= (desc[30] & 0xff) << 8;
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		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)
{
	unsigned char *desc = p;
	unsigned int start = 0;
	int offset = sdll % XCOPY_SEGMENT_DESC_LEN, rc, ret = 0;

	if (offset != 0) {
		pr_err("XCOPY segment descriptor list length is not"
			" multiple of %d\n", XCOPY_SEGMENT_DESC_LEN);
		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:
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			pr_err("XCOPY unsupported segment descriptor"
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				"type: 0x%02x\n", desc[0]);
			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;
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	unsigned char sense_buffer[TRANSPORT_SENSE_BUFFER];
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};

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struct se_portal_group xcopy_pt_tpg;
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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;

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	pr_debug("Calling configfs_undepend_item for"
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		  " remote_dev: %p remote_dev->dev_group: %p\n",
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		  remote_dev, &remote_dev->dev_group.cg_item);
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	target_undepend_item(&remote_dev->dev_group.cg_item);
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}

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;
}

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static const struct target_core_fabric_ops xcopy_pt_tfo = {
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	.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);
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	INIT_LIST_HEAD(&xcopy_pt_sess.sess_cmd_list);
	spin_lock_init(&xcopy_pt_sess.sess_cmd_lock);
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	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);
		}
	}
}

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static void target_xcopy_init_pt_lun(struct se_device *se_dev,
		struct se_cmd *pt_cmd, bool remote_port)
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{
	/*
	 * 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()
	 */
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	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;
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	}

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	pt_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
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}

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.
	 */
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	target_xcopy_init_pt_lun(se_dev, cmd, remote_port);

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	xpt_cmd->xcopy_op = xop;
	target_xcopy_setup_pt_port(xpt_cmd, xop, remote_port);

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	cmd->tag = 0;
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	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,
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				      cmd->data_length, false, false);
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		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);
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	return (se_cmd->scsi_status) ? -EINVAL : 0;
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}

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);

649
	transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, &xcopy_pt_sess, length,
650
			      DMA_FROM_DEVICE, 0, &xpt_cmd->sense_buffer[0]);
651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708
	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) {
		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) {
		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);

709
	transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, &xcopy_pt_sess, length,
710
			      DMA_TO_DEVICE, 0, &xpt_cmd->sense_buffer[0]);
711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825
	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;
		/*
		 * 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) {
		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);

	pr_warn("target_xcopy_do_work: Setting X-COPY CHECK_CONDITION -> sending response\n");
	ec_cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
	target_complete_cmd(ec_cmd, SAM_STAT_CHECK_CONDITION);
}

sense_reason_t target_do_xcopy(struct se_cmd *se_cmd)
{
826
	struct se_device *dev = se_cmd->se_dev;
827 828 829
	struct xcopy_op *xop = NULL;
	unsigned char *p = NULL, *seg_desc;
	unsigned int list_id, list_id_usage, sdll, inline_dl, sa;
830
	sense_reason_t ret = TCM_INVALID_PARAMETER_LIST;
831 832 833
	int rc;
	unsigned short tdll;

834 835 836 837 838
	if (!dev->dev_attrib.emulate_3pc) {
		pr_err("EXTENDED_COPY operation explicitly disabled\n");
		return TCM_UNSUPPORTED_SCSI_OPCODE;
	}

839 840 841 842 843 844
	sa = se_cmd->t_task_cdb[1] & 0x1f;
	if (sa != 0x00) {
		pr_err("EXTENDED_COPY(LID4) not supported\n");
		return TCM_UNSUPPORTED_SCSI_OPCODE;
	}

845 846 847 848 849 850 851
	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;

852 853 854
	p = transport_kmap_data_sg(se_cmd);
	if (!p) {
		pr_err("transport_kmap_data_sg() failed in target_do_xcopy\n");
855
		kfree(xop);
856 857 858 859
		return TCM_OUT_OF_RESOURCES;
	}

	list_id = p[0];
860 861
	list_id_usage = (p[1] & 0x18) >> 3;

862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881
	/*
	 * Determine TARGET DESCRIPTOR LIST LENGTH + SEGMENT DESCRIPTOR LIST LENGTH
	 */
	tdll = get_unaligned_be16(&p[2]);
	sdll = get_unaligned_be32(&p[8]);

	inline_dl = get_unaligned_be32(&p[12]);
	if (inline_dl != 0) {
		pr_err("XCOPY with non zero inline data length\n");
		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);

	rc = target_xcopy_parse_target_descriptors(se_cmd, xop, &p[16], tdll);
	if (rc <= 0)
		goto out;

882 883 884 885 886 887 888 889 890 891 892
	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;
	}

893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914
	pr_debug("XCOPY: Processed %d target descriptors, length: %u\n", rc,
				rc * XCOPY_TARGET_DESC_LEN);
	seg_desc = &p[16];
	seg_desc += (rc * XCOPY_TARGET_DESC_LEN);

	rc = target_xcopy_parse_segment_descriptors(se_cmd, xop, seg_desc, sdll);
	if (rc <= 0) {
		xcopy_pt_undepend_remotedev(xop);
		goto out;
	}
	transport_kunmap_data_sg(se_cmd);

	pr_debug("XCOPY: Processed %d segment descriptors, length: %u\n", rc,
				rc * XCOPY_SEGMENT_DESC_LEN);
	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);
915
	return ret;
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}

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;
}