1 /*******************************************************************************
2  * Filename: target_core_xcopy.c
3  *
4  * This file contains support for SPC-4 Extended-Copy offload with generic
5  * TCM backends.
6  *
7  * Copyright (c) 2011-2013 Datera, Inc. All rights reserved.
8  *
9  * Author:
10  * Nicholas A. Bellinger <nab@daterainc.com>
11  *
12  * This program is free software; you can redistribute it and/or modify
13  * it under the terms of the GNU General Public License as published by
14  * the Free Software Foundation; either version 2 of the License, or
15  * (at your option) any later version.
16  *
17  * This program is distributed in the hope that it will be useful,
18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
20  * GNU General Public License for more details.
21  *
22  ******************************************************************************/
23 
24 #include <linux/slab.h>
25 #include <linux/spinlock.h>
26 #include <linux/list.h>
27 #include <linux/configfs.h>
28 #include <linux/ratelimit.h>
29 #include <scsi/scsi_proto.h>
30 #include <asm/unaligned.h>
31 
32 #include <target/target_core_base.h>
33 #include <target/target_core_backend.h>
34 #include <target/target_core_fabric.h>
35 
36 #include "target_core_internal.h"
37 #include "target_core_pr.h"
38 #include "target_core_ua.h"
39 #include "target_core_xcopy.h"
40 
41 static struct workqueue_struct *xcopy_wq = NULL;
42 
43 static sense_reason_t target_parse_xcopy_cmd(struct xcopy_op *xop);
44 
45 static int target_xcopy_gen_naa_ieee(struct se_device *dev, unsigned char *buf)
46 {
47 	int off = 0;
48 
49 	buf[off++] = (0x6 << 4);
50 	buf[off++] = 0x01;
51 	buf[off++] = 0x40;
52 	buf[off] = (0x5 << 4);
53 
54 	spc_parse_naa_6h_vendor_specific(dev, &buf[off]);
55 	return 0;
56 }
57 
58 struct xcopy_dev_search_info {
59 	const unsigned char *dev_wwn;
60 	struct se_device *found_dev;
61 };
62 
63 static int target_xcopy_locate_se_dev_e4_iter(struct se_device *se_dev,
64 					      void *data)
65 {
66 	struct xcopy_dev_search_info *info = data;
67 	unsigned char tmp_dev_wwn[XCOPY_NAA_IEEE_REGEX_LEN];
68 	int rc;
69 
70 	if (!se_dev->dev_attrib.emulate_3pc)
71 		return 0;
72 
73 	memset(&tmp_dev_wwn[0], 0, XCOPY_NAA_IEEE_REGEX_LEN);
74 	target_xcopy_gen_naa_ieee(se_dev, &tmp_dev_wwn[0]);
75 
76 	rc = memcmp(&tmp_dev_wwn[0], info->dev_wwn, XCOPY_NAA_IEEE_REGEX_LEN);
77 	if (rc != 0)
78 		return 0;
79 
80 	info->found_dev = se_dev;
81 	pr_debug("XCOPY 0xe4: located se_dev: %p\n", se_dev);
82 
83 	rc = target_depend_item(&se_dev->dev_group.cg_item);
84 	if (rc != 0) {
85 		pr_err("configfs_depend_item attempt failed: %d for se_dev: %p\n",
86 		       rc, se_dev);
87 		return rc;
88 	}
89 
90 	pr_debug("Called configfs_depend_item for se_dev: %p se_dev->se_dev_group: %p\n",
91 		 se_dev, &se_dev->dev_group);
92 	return 1;
93 }
94 
95 static int target_xcopy_locate_se_dev_e4(const unsigned char *dev_wwn,
96 					struct se_device **found_dev)
97 {
98 	struct xcopy_dev_search_info info;
99 	int ret;
100 
101 	memset(&info, 0, sizeof(info));
102 	info.dev_wwn = dev_wwn;
103 
104 	ret = target_for_each_device(target_xcopy_locate_se_dev_e4_iter, &info);
105 	if (ret == 1) {
106 		*found_dev = info.found_dev;
107 		return 0;
108 	} else {
109 		pr_debug_ratelimited("Unable to locate 0xe4 descriptor for EXTENDED_COPY\n");
110 		return -EINVAL;
111 	}
112 }
113 
114 static int target_xcopy_parse_tiddesc_e4(struct se_cmd *se_cmd, struct xcopy_op *xop,
115 				unsigned char *p, unsigned short cscd_index)
116 {
117 	unsigned char *desc = p;
118 	unsigned short ript;
119 	u8 desig_len;
120 	/*
121 	 * Extract RELATIVE INITIATOR PORT IDENTIFIER
122 	 */
123 	ript = get_unaligned_be16(&desc[2]);
124 	pr_debug("XCOPY 0xe4: RELATIVE INITIATOR PORT IDENTIFIER: %hu\n", ript);
125 	/*
126 	 * Check for supported code set, association, and designator type
127 	 */
128 	if ((desc[4] & 0x0f) != 0x1) {
129 		pr_err("XCOPY 0xe4: code set of non binary type not supported\n");
130 		return -EINVAL;
131 	}
132 	if ((desc[5] & 0x30) != 0x00) {
133 		pr_err("XCOPY 0xe4: association other than LUN not supported\n");
134 		return -EINVAL;
135 	}
136 	if ((desc[5] & 0x0f) != 0x3) {
137 		pr_err("XCOPY 0xe4: designator type unsupported: 0x%02x\n",
138 				(desc[5] & 0x0f));
139 		return -EINVAL;
140 	}
141 	/*
142 	 * Check for matching 16 byte length for NAA IEEE Registered Extended
143 	 * Assigned designator
144 	 */
145 	desig_len = desc[7];
146 	if (desig_len != 16) {
147 		pr_err("XCOPY 0xe4: invalid desig_len: %d\n", (int)desig_len);
148 		return -EINVAL;
149 	}
150 	pr_debug("XCOPY 0xe4: desig_len: %d\n", (int)desig_len);
151 	/*
152 	 * Check for NAA IEEE Registered Extended Assigned header..
153 	 */
154 	if ((desc[8] & 0xf0) != 0x60) {
155 		pr_err("XCOPY 0xe4: Unsupported DESIGNATOR TYPE: 0x%02x\n",
156 					(desc[8] & 0xf0));
157 		return -EINVAL;
158 	}
159 
160 	if (cscd_index != xop->stdi && cscd_index != xop->dtdi) {
161 		pr_debug("XCOPY 0xe4: ignoring CSCD entry %d - neither src nor "
162 			 "dest\n", cscd_index);
163 		return 0;
164 	}
165 
166 	if (cscd_index == xop->stdi) {
167 		memcpy(&xop->src_tid_wwn[0], &desc[8], XCOPY_NAA_IEEE_REGEX_LEN);
168 		/*
169 		 * Determine if the source designator matches the local device
170 		 */
171 		if (!memcmp(&xop->local_dev_wwn[0], &xop->src_tid_wwn[0],
172 				XCOPY_NAA_IEEE_REGEX_LEN)) {
173 			xop->op_origin = XCOL_SOURCE_RECV_OP;
174 			xop->src_dev = se_cmd->se_dev;
175 			pr_debug("XCOPY 0xe4: Set xop->src_dev %p from source"
176 					" received xop\n", xop->src_dev);
177 		}
178 	}
179 
180 	if (cscd_index == xop->dtdi) {
181 		memcpy(&xop->dst_tid_wwn[0], &desc[8], XCOPY_NAA_IEEE_REGEX_LEN);
182 		/*
183 		 * Determine if the destination designator matches the local
184 		 * device. If @cscd_index corresponds to both source (stdi) and
185 		 * destination (dtdi), or dtdi comes after stdi, then
186 		 * XCOL_DEST_RECV_OP wins.
187 		 */
188 		if (!memcmp(&xop->local_dev_wwn[0], &xop->dst_tid_wwn[0],
189 				XCOPY_NAA_IEEE_REGEX_LEN)) {
190 			xop->op_origin = XCOL_DEST_RECV_OP;
191 			xop->dst_dev = se_cmd->se_dev;
192 			pr_debug("XCOPY 0xe4: Set xop->dst_dev: %p from destination"
193 				" received xop\n", xop->dst_dev);
194 		}
195 	}
196 
197 	return 0;
198 }
199 
200 static int target_xcopy_parse_target_descriptors(struct se_cmd *se_cmd,
201 				struct xcopy_op *xop, unsigned char *p,
202 				unsigned short tdll, sense_reason_t *sense_ret)
203 {
204 	struct se_device *local_dev = se_cmd->se_dev;
205 	unsigned char *desc = p;
206 	int offset = tdll % XCOPY_TARGET_DESC_LEN, rc;
207 	unsigned short cscd_index = 0;
208 	unsigned short start = 0;
209 
210 	*sense_ret = TCM_INVALID_PARAMETER_LIST;
211 
212 	if (offset != 0) {
213 		pr_err("XCOPY target descriptor list length is not"
214 			" multiple of %d\n", XCOPY_TARGET_DESC_LEN);
215 		*sense_ret = TCM_UNSUPPORTED_TARGET_DESC_TYPE_CODE;
216 		return -EINVAL;
217 	}
218 	if (tdll > RCR_OP_MAX_TARGET_DESC_COUNT * XCOPY_TARGET_DESC_LEN) {
219 		pr_err("XCOPY target descriptor supports a maximum"
220 			" two src/dest descriptors, tdll: %hu too large..\n", tdll);
221 		/* spc4r37 6.4.3.4 CSCD DESCRIPTOR LIST LENGTH field */
222 		*sense_ret = TCM_TOO_MANY_TARGET_DESCS;
223 		return -EINVAL;
224 	}
225 	/*
226 	 * Generate an IEEE Registered Extended designator based upon the
227 	 * se_device the XCOPY was received upon..
228 	 */
229 	memset(&xop->local_dev_wwn[0], 0, XCOPY_NAA_IEEE_REGEX_LEN);
230 	target_xcopy_gen_naa_ieee(local_dev, &xop->local_dev_wwn[0]);
231 
232 	while (start < tdll) {
233 		/*
234 		 * Check target descriptor identification with 0xE4 type, and
235 		 * compare the current index with the CSCD descriptor IDs in
236 		 * the segment descriptor. Use VPD 0x83 WWPN matching ..
237 		 */
238 		switch (desc[0]) {
239 		case 0xe4:
240 			rc = target_xcopy_parse_tiddesc_e4(se_cmd, xop,
241 							&desc[0], cscd_index);
242 			if (rc != 0)
243 				goto out;
244 			start += XCOPY_TARGET_DESC_LEN;
245 			desc += XCOPY_TARGET_DESC_LEN;
246 			cscd_index++;
247 			break;
248 		default:
249 			pr_err("XCOPY unsupported descriptor type code:"
250 					" 0x%02x\n", desc[0]);
251 			*sense_ret = TCM_UNSUPPORTED_TARGET_DESC_TYPE_CODE;
252 			goto out;
253 		}
254 	}
255 
256 	switch (xop->op_origin) {
257 	case XCOL_SOURCE_RECV_OP:
258 		rc = target_xcopy_locate_se_dev_e4(xop->dst_tid_wwn,
259 						&xop->dst_dev);
260 		break;
261 	case XCOL_DEST_RECV_OP:
262 		rc = target_xcopy_locate_se_dev_e4(xop->src_tid_wwn,
263 						&xop->src_dev);
264 		break;
265 	default:
266 		pr_err("XCOPY CSCD descriptor IDs not found in CSCD list - "
267 			"stdi: %hu dtdi: %hu\n", xop->stdi, xop->dtdi);
268 		rc = -EINVAL;
269 		break;
270 	}
271 	/*
272 	 * If a matching IEEE NAA 0x83 descriptor for the requested device
273 	 * is not located on this node, return COPY_ABORTED with ASQ/ASQC
274 	 * 0x0d/0x02 - COPY_TARGET_DEVICE_NOT_REACHABLE to request the
275 	 * initiator to fall back to normal copy method.
276 	 */
277 	if (rc < 0) {
278 		*sense_ret = TCM_COPY_TARGET_DEVICE_NOT_REACHABLE;
279 		goto out;
280 	}
281 
282 	pr_debug("XCOPY TGT desc: Source dev: %p NAA IEEE WWN: 0x%16phN\n",
283 		 xop->src_dev, &xop->src_tid_wwn[0]);
284 	pr_debug("XCOPY TGT desc: Dest dev: %p NAA IEEE WWN: 0x%16phN\n",
285 		 xop->dst_dev, &xop->dst_tid_wwn[0]);
286 
287 	return cscd_index;
288 
289 out:
290 	return -EINVAL;
291 }
292 
293 static int target_xcopy_parse_segdesc_02(struct se_cmd *se_cmd, struct xcopy_op *xop,
294 					unsigned char *p)
295 {
296 	unsigned char *desc = p;
297 	int dc = (desc[1] & 0x02);
298 	unsigned short desc_len;
299 
300 	desc_len = get_unaligned_be16(&desc[2]);
301 	if (desc_len != 0x18) {
302 		pr_err("XCOPY segment desc 0x02: Illegal desc_len:"
303 				" %hu\n", desc_len);
304 		return -EINVAL;
305 	}
306 
307 	xop->stdi = get_unaligned_be16(&desc[4]);
308 	xop->dtdi = get_unaligned_be16(&desc[6]);
309 
310 	if (xop->stdi > XCOPY_CSCD_DESC_ID_LIST_OFF_MAX ||
311 	    xop->dtdi > XCOPY_CSCD_DESC_ID_LIST_OFF_MAX) {
312 		pr_err("XCOPY segment desc 0x02: unsupported CSCD ID > 0x%x; stdi: %hu dtdi: %hu\n",
313 			XCOPY_CSCD_DESC_ID_LIST_OFF_MAX, xop->stdi, xop->dtdi);
314 		return -EINVAL;
315 	}
316 
317 	pr_debug("XCOPY seg desc 0x02: desc_len: %hu stdi: %hu dtdi: %hu, DC: %d\n",
318 		desc_len, xop->stdi, xop->dtdi, dc);
319 
320 	xop->nolb = get_unaligned_be16(&desc[10]);
321 	xop->src_lba = get_unaligned_be64(&desc[12]);
322 	xop->dst_lba = get_unaligned_be64(&desc[20]);
323 	pr_debug("XCOPY seg desc 0x02: nolb: %hu src_lba: %llu dst_lba: %llu\n",
324 		xop->nolb, (unsigned long long)xop->src_lba,
325 		(unsigned long long)xop->dst_lba);
326 
327 	if (dc != 0) {
328 		xop->dbl = get_unaligned_be24(&desc[29]);
329 
330 		pr_debug("XCOPY seg desc 0x02: DC=1 w/ dbl: %u\n", xop->dbl);
331 	}
332 	return 0;
333 }
334 
335 static int target_xcopy_parse_segment_descriptors(struct se_cmd *se_cmd,
336 				struct xcopy_op *xop, unsigned char *p,
337 				unsigned int sdll, sense_reason_t *sense_ret)
338 {
339 	unsigned char *desc = p;
340 	unsigned int start = 0;
341 	int offset = sdll % XCOPY_SEGMENT_DESC_LEN, rc, ret = 0;
342 
343 	*sense_ret = TCM_INVALID_PARAMETER_LIST;
344 
345 	if (offset != 0) {
346 		pr_err("XCOPY segment descriptor list length is not"
347 			" multiple of %d\n", XCOPY_SEGMENT_DESC_LEN);
348 		*sense_ret = TCM_UNSUPPORTED_SEGMENT_DESC_TYPE_CODE;
349 		return -EINVAL;
350 	}
351 	if (sdll > RCR_OP_MAX_SG_DESC_COUNT * XCOPY_SEGMENT_DESC_LEN) {
352 		pr_err("XCOPY supports %u segment descriptor(s), sdll: %u too"
353 			" large..\n", RCR_OP_MAX_SG_DESC_COUNT, sdll);
354 		/* spc4r37 6.4.3.5 SEGMENT DESCRIPTOR LIST LENGTH field */
355 		*sense_ret = TCM_TOO_MANY_SEGMENT_DESCS;
356 		return -EINVAL;
357 	}
358 
359 	while (start < sdll) {
360 		/*
361 		 * Check segment descriptor type code for block -> block
362 		 */
363 		switch (desc[0]) {
364 		case 0x02:
365 			rc = target_xcopy_parse_segdesc_02(se_cmd, xop, desc);
366 			if (rc < 0)
367 				goto out;
368 
369 			ret++;
370 			start += XCOPY_SEGMENT_DESC_LEN;
371 			desc += XCOPY_SEGMENT_DESC_LEN;
372 			break;
373 		default:
374 			pr_err("XCOPY unsupported segment descriptor"
375 				"type: 0x%02x\n", desc[0]);
376 			*sense_ret = TCM_UNSUPPORTED_SEGMENT_DESC_TYPE_CODE;
377 			goto out;
378 		}
379 	}
380 
381 	return ret;
382 
383 out:
384 	return -EINVAL;
385 }
386 
387 /*
388  * Start xcopy_pt ops
389  */
390 
391 struct xcopy_pt_cmd {
392 	bool remote_port;
393 	struct se_cmd se_cmd;
394 	struct xcopy_op *xcopy_op;
395 	struct completion xpt_passthrough_sem;
396 	unsigned char sense_buffer[TRANSPORT_SENSE_BUFFER];
397 };
398 
399 struct se_portal_group xcopy_pt_tpg;
400 static struct se_session xcopy_pt_sess;
401 static struct se_node_acl xcopy_pt_nacl;
402 
403 static char *xcopy_pt_get_fabric_name(void)
404 {
405         return "xcopy-pt";
406 }
407 
408 static int xcopy_pt_get_cmd_state(struct se_cmd *se_cmd)
409 {
410         return 0;
411 }
412 
413 static void xcopy_pt_undepend_remotedev(struct xcopy_op *xop)
414 {
415 	struct se_device *remote_dev;
416 
417 	if (xop->op_origin == XCOL_SOURCE_RECV_OP)
418 		remote_dev = xop->dst_dev;
419 	else
420 		remote_dev = xop->src_dev;
421 
422 	pr_debug("Calling configfs_undepend_item for"
423 		  " remote_dev: %p remote_dev->dev_group: %p\n",
424 		  remote_dev, &remote_dev->dev_group.cg_item);
425 
426 	target_undepend_item(&remote_dev->dev_group.cg_item);
427 }
428 
429 static void xcopy_pt_release_cmd(struct se_cmd *se_cmd)
430 {
431 	struct xcopy_pt_cmd *xpt_cmd = container_of(se_cmd,
432 				struct xcopy_pt_cmd, se_cmd);
433 
434 	kfree(xpt_cmd);
435 }
436 
437 static int xcopy_pt_check_stop_free(struct se_cmd *se_cmd)
438 {
439 	struct xcopy_pt_cmd *xpt_cmd = container_of(se_cmd,
440 				struct xcopy_pt_cmd, se_cmd);
441 
442 	complete(&xpt_cmd->xpt_passthrough_sem);
443 	return 0;
444 }
445 
446 static int xcopy_pt_write_pending(struct se_cmd *se_cmd)
447 {
448 	return 0;
449 }
450 
451 static int xcopy_pt_write_pending_status(struct se_cmd *se_cmd)
452 {
453 	return 0;
454 }
455 
456 static int xcopy_pt_queue_data_in(struct se_cmd *se_cmd)
457 {
458 	return 0;
459 }
460 
461 static int xcopy_pt_queue_status(struct se_cmd *se_cmd)
462 {
463 	return 0;
464 }
465 
466 static const struct target_core_fabric_ops xcopy_pt_tfo = {
467 	.get_fabric_name	= xcopy_pt_get_fabric_name,
468 	.get_cmd_state		= xcopy_pt_get_cmd_state,
469 	.release_cmd		= xcopy_pt_release_cmd,
470 	.check_stop_free	= xcopy_pt_check_stop_free,
471 	.write_pending		= xcopy_pt_write_pending,
472 	.write_pending_status	= xcopy_pt_write_pending_status,
473 	.queue_data_in		= xcopy_pt_queue_data_in,
474 	.queue_status		= xcopy_pt_queue_status,
475 };
476 
477 /*
478  * End xcopy_pt_ops
479  */
480 
481 int target_xcopy_setup_pt(void)
482 {
483 	xcopy_wq = alloc_workqueue("xcopy_wq", WQ_MEM_RECLAIM, 0);
484 	if (!xcopy_wq) {
485 		pr_err("Unable to allocate xcopy_wq\n");
486 		return -ENOMEM;
487 	}
488 
489 	memset(&xcopy_pt_tpg, 0, sizeof(struct se_portal_group));
490 	INIT_LIST_HEAD(&xcopy_pt_tpg.se_tpg_node);
491 	INIT_LIST_HEAD(&xcopy_pt_tpg.acl_node_list);
492 	INIT_LIST_HEAD(&xcopy_pt_tpg.tpg_sess_list);
493 
494 	xcopy_pt_tpg.se_tpg_tfo = &xcopy_pt_tfo;
495 
496 	memset(&xcopy_pt_nacl, 0, sizeof(struct se_node_acl));
497 	INIT_LIST_HEAD(&xcopy_pt_nacl.acl_list);
498 	INIT_LIST_HEAD(&xcopy_pt_nacl.acl_sess_list);
499 	memset(&xcopy_pt_sess, 0, sizeof(struct se_session));
500 	transport_init_session(&xcopy_pt_sess);
501 
502 	xcopy_pt_nacl.se_tpg = &xcopy_pt_tpg;
503 	xcopy_pt_nacl.nacl_sess = &xcopy_pt_sess;
504 
505 	xcopy_pt_sess.se_tpg = &xcopy_pt_tpg;
506 	xcopy_pt_sess.se_node_acl = &xcopy_pt_nacl;
507 
508 	return 0;
509 }
510 
511 void target_xcopy_release_pt(void)
512 {
513 	if (xcopy_wq)
514 		destroy_workqueue(xcopy_wq);
515 }
516 
517 static void target_xcopy_setup_pt_port(
518 	struct xcopy_pt_cmd *xpt_cmd,
519 	struct xcopy_op *xop,
520 	bool remote_port)
521 {
522 	struct se_cmd *ec_cmd = xop->xop_se_cmd;
523 	struct se_cmd *pt_cmd = &xpt_cmd->se_cmd;
524 
525 	if (xop->op_origin == XCOL_SOURCE_RECV_OP) {
526 		/*
527 		 * Honor destination port reservations for X-COPY PUSH emulation
528 		 * when CDB is received on local source port, and READs blocks to
529 		 * WRITE on remote destination port.
530 		 */
531 		if (remote_port) {
532 			xpt_cmd->remote_port = remote_port;
533 		} else {
534 			pt_cmd->se_lun = ec_cmd->se_lun;
535 			pt_cmd->se_dev = ec_cmd->se_dev;
536 
537 			pr_debug("Honoring local SRC port from ec_cmd->se_dev:"
538 				" %p\n", pt_cmd->se_dev);
539 			pt_cmd->se_lun = ec_cmd->se_lun;
540 			pr_debug("Honoring local SRC port from ec_cmd->se_lun: %p\n",
541 				pt_cmd->se_lun);
542 		}
543 	} else {
544 		/*
545 		 * Honor source port reservation for X-COPY PULL emulation
546 		 * when CDB is received on local desintation port, and READs
547 		 * blocks from the remote source port to WRITE on local
548 		 * destination port.
549 		 */
550 		if (remote_port) {
551 			xpt_cmd->remote_port = remote_port;
552 		} else {
553 			pt_cmd->se_lun = ec_cmd->se_lun;
554 			pt_cmd->se_dev = ec_cmd->se_dev;
555 
556 			pr_debug("Honoring local DST port from ec_cmd->se_dev:"
557 				" %p\n", pt_cmd->se_dev);
558 			pt_cmd->se_lun = ec_cmd->se_lun;
559 			pr_debug("Honoring local DST port from ec_cmd->se_lun: %p\n",
560 				pt_cmd->se_lun);
561 		}
562 	}
563 }
564 
565 static void target_xcopy_init_pt_lun(struct se_device *se_dev,
566 		struct se_cmd *pt_cmd, bool remote_port)
567 {
568 	/*
569 	 * Don't allocate + init an pt_cmd->se_lun if honoring local port for
570 	 * reservations.  The pt_cmd->se_lun pointer will be setup from within
571 	 * target_xcopy_setup_pt_port()
572 	 */
573 	if (remote_port) {
574 		pr_debug("Setup emulated se_dev: %p from se_dev\n",
575 			pt_cmd->se_dev);
576 		pt_cmd->se_lun = &se_dev->xcopy_lun;
577 		pt_cmd->se_dev = se_dev;
578 	}
579 
580 	pt_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
581 }
582 
583 static int target_xcopy_setup_pt_cmd(
584 	struct xcopy_pt_cmd *xpt_cmd,
585 	struct xcopy_op *xop,
586 	struct se_device *se_dev,
587 	unsigned char *cdb,
588 	bool remote_port,
589 	bool alloc_mem)
590 {
591 	struct se_cmd *cmd = &xpt_cmd->se_cmd;
592 	sense_reason_t sense_rc;
593 	int ret = 0, rc;
594 	/*
595 	 * Setup LUN+port to honor reservations based upon xop->op_origin for
596 	 * X-COPY PUSH or X-COPY PULL based upon where the CDB was received.
597 	 */
598 	target_xcopy_init_pt_lun(se_dev, cmd, remote_port);
599 
600 	xpt_cmd->xcopy_op = xop;
601 	target_xcopy_setup_pt_port(xpt_cmd, xop, remote_port);
602 
603 	cmd->tag = 0;
604 	sense_rc = target_setup_cmd_from_cdb(cmd, cdb);
605 	if (sense_rc) {
606 		ret = -EINVAL;
607 		goto out;
608 	}
609 
610 	if (alloc_mem) {
611 		rc = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents,
612 				      cmd->data_length, false, false);
613 		if (rc < 0) {
614 			ret = rc;
615 			goto out;
616 		}
617 		/*
618 		 * Set this bit so that transport_free_pages() allows the
619 		 * caller to release SGLs + physical memory allocated by
620 		 * transport_generic_get_mem()..
621 		 */
622 		cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
623 	} else {
624 		/*
625 		 * Here the previously allocated SGLs for the internal READ
626 		 * are mapped zero-copy to the internal WRITE.
627 		 */
628 		sense_rc = transport_generic_map_mem_to_cmd(cmd,
629 					xop->xop_data_sg, xop->xop_data_nents,
630 					NULL, 0);
631 		if (sense_rc) {
632 			ret = -EINVAL;
633 			goto out;
634 		}
635 
636 		pr_debug("Setup PASSTHROUGH_NOALLOC t_data_sg: %p t_data_nents:"
637 			 " %u\n", cmd->t_data_sg, cmd->t_data_nents);
638 	}
639 
640 	return 0;
641 
642 out:
643 	return ret;
644 }
645 
646 static int target_xcopy_issue_pt_cmd(struct xcopy_pt_cmd *xpt_cmd)
647 {
648 	struct se_cmd *se_cmd = &xpt_cmd->se_cmd;
649 	sense_reason_t sense_rc;
650 
651 	sense_rc = transport_generic_new_cmd(se_cmd);
652 	if (sense_rc)
653 		return -EINVAL;
654 
655 	if (se_cmd->data_direction == DMA_TO_DEVICE)
656 		target_execute_cmd(se_cmd);
657 
658 	wait_for_completion_interruptible(&xpt_cmd->xpt_passthrough_sem);
659 
660 	pr_debug("target_xcopy_issue_pt_cmd(): SCSI status: 0x%02x\n",
661 			se_cmd->scsi_status);
662 
663 	return (se_cmd->scsi_status) ? -EINVAL : 0;
664 }
665 
666 static int target_xcopy_read_source(
667 	struct se_cmd *ec_cmd,
668 	struct xcopy_op *xop,
669 	struct se_device *src_dev,
670 	sector_t src_lba,
671 	u32 src_sectors)
672 {
673 	struct xcopy_pt_cmd *xpt_cmd;
674 	struct se_cmd *se_cmd;
675 	u32 length = (src_sectors * src_dev->dev_attrib.block_size);
676 	int rc;
677 	unsigned char cdb[16];
678 	bool remote_port = (xop->op_origin == XCOL_DEST_RECV_OP);
679 
680 	xpt_cmd = kzalloc(sizeof(struct xcopy_pt_cmd), GFP_KERNEL);
681 	if (!xpt_cmd) {
682 		pr_err("Unable to allocate xcopy_pt_cmd\n");
683 		return -ENOMEM;
684 	}
685 	init_completion(&xpt_cmd->xpt_passthrough_sem);
686 	se_cmd = &xpt_cmd->se_cmd;
687 
688 	memset(&cdb[0], 0, 16);
689 	cdb[0] = READ_16;
690 	put_unaligned_be64(src_lba, &cdb[2]);
691 	put_unaligned_be32(src_sectors, &cdb[10]);
692 	pr_debug("XCOPY: Built READ_16: LBA: %llu Sectors: %u Length: %u\n",
693 		(unsigned long long)src_lba, src_sectors, length);
694 
695 	transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, &xcopy_pt_sess, length,
696 			      DMA_FROM_DEVICE, 0, &xpt_cmd->sense_buffer[0]);
697 	xop->src_pt_cmd = xpt_cmd;
698 
699 	rc = target_xcopy_setup_pt_cmd(xpt_cmd, xop, src_dev, &cdb[0],
700 				remote_port, true);
701 	if (rc < 0) {
702 		ec_cmd->scsi_status = xpt_cmd->se_cmd.scsi_status;
703 		transport_generic_free_cmd(se_cmd, 0);
704 		return rc;
705 	}
706 
707 	xop->xop_data_sg = se_cmd->t_data_sg;
708 	xop->xop_data_nents = se_cmd->t_data_nents;
709 	pr_debug("XCOPY-READ: Saved xop->xop_data_sg: %p, num: %u for READ"
710 		" memory\n", xop->xop_data_sg, xop->xop_data_nents);
711 
712 	rc = target_xcopy_issue_pt_cmd(xpt_cmd);
713 	if (rc < 0) {
714 		ec_cmd->scsi_status = xpt_cmd->se_cmd.scsi_status;
715 		transport_generic_free_cmd(se_cmd, 0);
716 		return rc;
717 	}
718 	/*
719 	 * Clear off the allocated t_data_sg, that has been saved for
720 	 * zero-copy WRITE submission reuse in struct xcopy_op..
721 	 */
722 	se_cmd->t_data_sg = NULL;
723 	se_cmd->t_data_nents = 0;
724 
725 	return 0;
726 }
727 
728 static int target_xcopy_write_destination(
729 	struct se_cmd *ec_cmd,
730 	struct xcopy_op *xop,
731 	struct se_device *dst_dev,
732 	sector_t dst_lba,
733 	u32 dst_sectors)
734 {
735 	struct xcopy_pt_cmd *xpt_cmd;
736 	struct se_cmd *se_cmd;
737 	u32 length = (dst_sectors * dst_dev->dev_attrib.block_size);
738 	int rc;
739 	unsigned char cdb[16];
740 	bool remote_port = (xop->op_origin == XCOL_SOURCE_RECV_OP);
741 
742 	xpt_cmd = kzalloc(sizeof(struct xcopy_pt_cmd), GFP_KERNEL);
743 	if (!xpt_cmd) {
744 		pr_err("Unable to allocate xcopy_pt_cmd\n");
745 		return -ENOMEM;
746 	}
747 	init_completion(&xpt_cmd->xpt_passthrough_sem);
748 	se_cmd = &xpt_cmd->se_cmd;
749 
750 	memset(&cdb[0], 0, 16);
751 	cdb[0] = WRITE_16;
752 	put_unaligned_be64(dst_lba, &cdb[2]);
753 	put_unaligned_be32(dst_sectors, &cdb[10]);
754 	pr_debug("XCOPY: Built WRITE_16: LBA: %llu Sectors: %u Length: %u\n",
755 		(unsigned long long)dst_lba, dst_sectors, length);
756 
757 	transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, &xcopy_pt_sess, length,
758 			      DMA_TO_DEVICE, 0, &xpt_cmd->sense_buffer[0]);
759 	xop->dst_pt_cmd = xpt_cmd;
760 
761 	rc = target_xcopy_setup_pt_cmd(xpt_cmd, xop, dst_dev, &cdb[0],
762 				remote_port, false);
763 	if (rc < 0) {
764 		struct se_cmd *src_cmd = &xop->src_pt_cmd->se_cmd;
765 		ec_cmd->scsi_status = xpt_cmd->se_cmd.scsi_status;
766 		/*
767 		 * If the failure happened before the t_mem_list hand-off in
768 		 * target_xcopy_setup_pt_cmd(), Reset memory + clear flag so that
769 		 * core releases this memory on error during X-COPY WRITE I/O.
770 		 */
771 		src_cmd->se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
772 		src_cmd->t_data_sg = xop->xop_data_sg;
773 		src_cmd->t_data_nents = xop->xop_data_nents;
774 
775 		transport_generic_free_cmd(se_cmd, 0);
776 		return rc;
777 	}
778 
779 	rc = target_xcopy_issue_pt_cmd(xpt_cmd);
780 	if (rc < 0) {
781 		ec_cmd->scsi_status = xpt_cmd->se_cmd.scsi_status;
782 		se_cmd->se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
783 		transport_generic_free_cmd(se_cmd, 0);
784 		return rc;
785 	}
786 
787 	return 0;
788 }
789 
790 static void target_xcopy_do_work(struct work_struct *work)
791 {
792 	struct xcopy_op *xop = container_of(work, struct xcopy_op, xop_work);
793 	struct se_cmd *ec_cmd = xop->xop_se_cmd;
794 	struct se_device *src_dev, *dst_dev;
795 	sector_t src_lba, dst_lba, end_lba;
796 	unsigned int max_sectors;
797 	int rc = 0;
798 	unsigned short nolb, cur_nolb, max_nolb, copied_nolb = 0;
799 
800 	if (target_parse_xcopy_cmd(xop) != TCM_NO_SENSE)
801 		goto err_free;
802 
803 	if (WARN_ON_ONCE(!xop->src_dev) || WARN_ON_ONCE(!xop->dst_dev))
804 		goto err_free;
805 
806 	src_dev = xop->src_dev;
807 	dst_dev = xop->dst_dev;
808 	src_lba = xop->src_lba;
809 	dst_lba = xop->dst_lba;
810 	nolb = xop->nolb;
811 	end_lba = src_lba + nolb;
812 	/*
813 	 * Break up XCOPY I/O into hw_max_sectors sized I/O based on the
814 	 * smallest max_sectors between src_dev + dev_dev, or
815 	 */
816 	max_sectors = min(src_dev->dev_attrib.hw_max_sectors,
817 			  dst_dev->dev_attrib.hw_max_sectors);
818 	max_sectors = min_t(u32, max_sectors, XCOPY_MAX_SECTORS);
819 
820 	max_nolb = min_t(u16, max_sectors, ((u16)(~0U)));
821 
822 	pr_debug("target_xcopy_do_work: nolb: %hu, max_nolb: %hu end_lba: %llu\n",
823 			nolb, max_nolb, (unsigned long long)end_lba);
824 	pr_debug("target_xcopy_do_work: Starting src_lba: %llu, dst_lba: %llu\n",
825 			(unsigned long long)src_lba, (unsigned long long)dst_lba);
826 
827 	while (src_lba < end_lba) {
828 		cur_nolb = min(nolb, max_nolb);
829 
830 		pr_debug("target_xcopy_do_work: Calling read src_dev: %p src_lba: %llu,"
831 			" cur_nolb: %hu\n", src_dev, (unsigned long long)src_lba, cur_nolb);
832 
833 		rc = target_xcopy_read_source(ec_cmd, xop, src_dev, src_lba, cur_nolb);
834 		if (rc < 0)
835 			goto out;
836 
837 		src_lba += cur_nolb;
838 		pr_debug("target_xcopy_do_work: Incremented READ src_lba to %llu\n",
839 				(unsigned long long)src_lba);
840 
841 		pr_debug("target_xcopy_do_work: Calling write dst_dev: %p dst_lba: %llu,"
842 			" cur_nolb: %hu\n", dst_dev, (unsigned long long)dst_lba, cur_nolb);
843 
844 		rc = target_xcopy_write_destination(ec_cmd, xop, dst_dev,
845 						dst_lba, cur_nolb);
846 		if (rc < 0) {
847 			transport_generic_free_cmd(&xop->src_pt_cmd->se_cmd, 0);
848 			goto out;
849 		}
850 
851 		dst_lba += cur_nolb;
852 		pr_debug("target_xcopy_do_work: Incremented WRITE dst_lba to %llu\n",
853 				(unsigned long long)dst_lba);
854 
855 		copied_nolb += cur_nolb;
856 		nolb -= cur_nolb;
857 
858 		transport_generic_free_cmd(&xop->src_pt_cmd->se_cmd, 0);
859 		xop->dst_pt_cmd->se_cmd.se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
860 
861 		transport_generic_free_cmd(&xop->dst_pt_cmd->se_cmd, 0);
862 	}
863 
864 	xcopy_pt_undepend_remotedev(xop);
865 	kfree(xop);
866 
867 	pr_debug("target_xcopy_do_work: Final src_lba: %llu, dst_lba: %llu\n",
868 		(unsigned long long)src_lba, (unsigned long long)dst_lba);
869 	pr_debug("target_xcopy_do_work: Blocks copied: %hu, Bytes Copied: %u\n",
870 		copied_nolb, copied_nolb * dst_dev->dev_attrib.block_size);
871 
872 	pr_debug("target_xcopy_do_work: Setting X-COPY GOOD status -> sending response\n");
873 	target_complete_cmd(ec_cmd, SAM_STAT_GOOD);
874 	return;
875 
876 out:
877 	xcopy_pt_undepend_remotedev(xop);
878 
879 err_free:
880 	kfree(xop);
881 	/*
882 	 * Don't override an error scsi status if it has already been set
883 	 */
884 	if (ec_cmd->scsi_status == SAM_STAT_GOOD) {
885 		pr_warn_ratelimited("target_xcopy_do_work: rc: %d, Setting X-COPY"
886 			" CHECK_CONDITION -> sending response\n", rc);
887 		ec_cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
888 	}
889 	target_complete_cmd(ec_cmd, ec_cmd->scsi_status);
890 }
891 
892 /*
893  * Returns TCM_NO_SENSE upon success or a sense code != TCM_NO_SENSE if parsing
894  * fails.
895  */
896 static sense_reason_t target_parse_xcopy_cmd(struct xcopy_op *xop)
897 {
898 	struct se_cmd *se_cmd = xop->xop_se_cmd;
899 	unsigned char *p = NULL, *seg_desc;
900 	unsigned int list_id, list_id_usage, sdll, inline_dl;
901 	sense_reason_t ret = TCM_INVALID_PARAMETER_LIST;
902 	int rc;
903 	unsigned short tdll;
904 
905 	p = transport_kmap_data_sg(se_cmd);
906 	if (!p) {
907 		pr_err("transport_kmap_data_sg() failed in target_do_xcopy\n");
908 		return TCM_OUT_OF_RESOURCES;
909 	}
910 
911 	list_id = p[0];
912 	list_id_usage = (p[1] & 0x18) >> 3;
913 
914 	/*
915 	 * Determine TARGET DESCRIPTOR LIST LENGTH + SEGMENT DESCRIPTOR LIST LENGTH
916 	 */
917 	tdll = get_unaligned_be16(&p[2]);
918 	sdll = get_unaligned_be32(&p[8]);
919 	if (tdll + sdll > RCR_OP_MAX_DESC_LIST_LEN) {
920 		pr_err("XCOPY descriptor list length %u exceeds maximum %u\n",
921 		       tdll + sdll, RCR_OP_MAX_DESC_LIST_LEN);
922 		ret = TCM_PARAMETER_LIST_LENGTH_ERROR;
923 		goto out;
924 	}
925 
926 	inline_dl = get_unaligned_be32(&p[12]);
927 	if (inline_dl != 0) {
928 		pr_err("XCOPY with non zero inline data length\n");
929 		goto out;
930 	}
931 
932 	if (se_cmd->data_length < (XCOPY_HDR_LEN + tdll + sdll + inline_dl)) {
933 		pr_err("XCOPY parameter truncation: data length %u too small "
934 			"for tdll: %hu sdll: %u inline_dl: %u\n",
935 			se_cmd->data_length, tdll, sdll, inline_dl);
936 		ret = TCM_PARAMETER_LIST_LENGTH_ERROR;
937 		goto out;
938 	}
939 
940 	pr_debug("Processing XCOPY with list_id: 0x%02x list_id_usage: 0x%02x"
941 		" tdll: %hu sdll: %u inline_dl: %u\n", list_id, list_id_usage,
942 		tdll, sdll, inline_dl);
943 
944 	/*
945 	 * skip over the target descriptors until segment descriptors
946 	 * have been passed - CSCD ids are needed to determine src and dest.
947 	 */
948 	seg_desc = &p[16] + tdll;
949 
950 	rc = target_xcopy_parse_segment_descriptors(se_cmd, xop, seg_desc,
951 						    sdll, &ret);
952 	if (rc <= 0)
953 		goto out;
954 
955 	pr_debug("XCOPY: Processed %d segment descriptors, length: %u\n", rc,
956 				rc * XCOPY_SEGMENT_DESC_LEN);
957 
958 	rc = target_xcopy_parse_target_descriptors(se_cmd, xop, &p[16], tdll, &ret);
959 	if (rc <= 0)
960 		goto out;
961 
962 	if (xop->src_dev->dev_attrib.block_size !=
963 	    xop->dst_dev->dev_attrib.block_size) {
964 		pr_err("XCOPY: Non matching src_dev block_size: %u + dst_dev"
965 		       " block_size: %u currently unsupported\n",
966 			xop->src_dev->dev_attrib.block_size,
967 			xop->dst_dev->dev_attrib.block_size);
968 		xcopy_pt_undepend_remotedev(xop);
969 		ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
970 		goto out;
971 	}
972 
973 	pr_debug("XCOPY: Processed %d target descriptors, length: %u\n", rc,
974 				rc * XCOPY_TARGET_DESC_LEN);
975 	transport_kunmap_data_sg(se_cmd);
976 	return TCM_NO_SENSE;
977 
978 out:
979 	if (p)
980 		transport_kunmap_data_sg(se_cmd);
981 	return ret;
982 }
983 
984 sense_reason_t target_do_xcopy(struct se_cmd *se_cmd)
985 {
986 	struct se_device *dev = se_cmd->se_dev;
987 	struct xcopy_op *xop;
988 	unsigned int sa;
989 
990 	if (!dev->dev_attrib.emulate_3pc) {
991 		pr_err("EXTENDED_COPY operation explicitly disabled\n");
992 		return TCM_UNSUPPORTED_SCSI_OPCODE;
993 	}
994 
995 	sa = se_cmd->t_task_cdb[1] & 0x1f;
996 	if (sa != 0x00) {
997 		pr_err("EXTENDED_COPY(LID4) not supported\n");
998 		return TCM_UNSUPPORTED_SCSI_OPCODE;
999 	}
1000 
1001 	if (se_cmd->data_length == 0) {
1002 		target_complete_cmd(se_cmd, SAM_STAT_GOOD);
1003 		return TCM_NO_SENSE;
1004 	}
1005 	if (se_cmd->data_length < XCOPY_HDR_LEN) {
1006 		pr_err("XCOPY parameter truncation: length %u < hdr_len %u\n",
1007 				se_cmd->data_length, XCOPY_HDR_LEN);
1008 		return TCM_PARAMETER_LIST_LENGTH_ERROR;
1009 	}
1010 
1011 	xop = kzalloc(sizeof(struct xcopy_op), GFP_KERNEL);
1012 	if (!xop)
1013 		goto err;
1014 	xop->xop_se_cmd = se_cmd;
1015 	INIT_WORK(&xop->xop_work, target_xcopy_do_work);
1016 	if (WARN_ON_ONCE(!queue_work(xcopy_wq, &xop->xop_work)))
1017 		goto free;
1018 	return TCM_NO_SENSE;
1019 
1020 free:
1021 	kfree(xop);
1022 
1023 err:
1024 	return TCM_OUT_OF_RESOURCES;
1025 }
1026 
1027 static sense_reason_t target_rcr_operating_parameters(struct se_cmd *se_cmd)
1028 {
1029 	unsigned char *p;
1030 
1031 	p = transport_kmap_data_sg(se_cmd);
1032 	if (!p) {
1033 		pr_err("transport_kmap_data_sg failed in"
1034 		       " target_rcr_operating_parameters\n");
1035 		return TCM_OUT_OF_RESOURCES;
1036 	}
1037 
1038 	if (se_cmd->data_length < 54) {
1039 		pr_err("Receive Copy Results Op Parameters length"
1040 		       " too small: %u\n", se_cmd->data_length);
1041 		transport_kunmap_data_sg(se_cmd);
1042 		return TCM_INVALID_CDB_FIELD;
1043 	}
1044 	/*
1045 	 * Set SNLID=1 (Supports no List ID)
1046 	 */
1047 	p[4] = 0x1;
1048 	/*
1049 	 * MAXIMUM TARGET DESCRIPTOR COUNT
1050 	 */
1051 	put_unaligned_be16(RCR_OP_MAX_TARGET_DESC_COUNT, &p[8]);
1052 	/*
1053 	 * MAXIMUM SEGMENT DESCRIPTOR COUNT
1054 	 */
1055 	put_unaligned_be16(RCR_OP_MAX_SG_DESC_COUNT, &p[10]);
1056 	/*
1057 	 * MAXIMUM DESCRIPTOR LIST LENGTH
1058 	 */
1059 	put_unaligned_be32(RCR_OP_MAX_DESC_LIST_LEN, &p[12]);
1060 	/*
1061 	 * MAXIMUM SEGMENT LENGTH
1062 	 */
1063 	put_unaligned_be32(RCR_OP_MAX_SEGMENT_LEN, &p[16]);
1064 	/*
1065 	 * MAXIMUM INLINE DATA LENGTH for SA 0x04 (NOT SUPPORTED)
1066 	 */
1067 	put_unaligned_be32(0x0, &p[20]);
1068 	/*
1069 	 * HELD DATA LIMIT
1070 	 */
1071 	put_unaligned_be32(0x0, &p[24]);
1072 	/*
1073 	 * MAXIMUM STREAM DEVICE TRANSFER SIZE
1074 	 */
1075 	put_unaligned_be32(0x0, &p[28]);
1076 	/*
1077 	 * TOTAL CONCURRENT COPIES
1078 	 */
1079 	put_unaligned_be16(RCR_OP_TOTAL_CONCURR_COPIES, &p[34]);
1080 	/*
1081 	 * MAXIMUM CONCURRENT COPIES
1082 	 */
1083 	p[36] = RCR_OP_MAX_CONCURR_COPIES;
1084 	/*
1085 	 * DATA SEGMENT GRANULARITY (log 2)
1086 	 */
1087 	p[37] = RCR_OP_DATA_SEG_GRAN_LOG2;
1088 	/*
1089 	 * INLINE DATA GRANULARITY log 2)
1090 	 */
1091 	p[38] = RCR_OP_INLINE_DATA_GRAN_LOG2;
1092 	/*
1093 	 * HELD DATA GRANULARITY
1094 	 */
1095 	p[39] = RCR_OP_HELD_DATA_GRAN_LOG2;
1096 	/*
1097 	 * IMPLEMENTED DESCRIPTOR LIST LENGTH
1098 	 */
1099 	p[43] = 0x2;
1100 	/*
1101 	 * List of implemented descriptor type codes (ordered)
1102 	 */
1103 	p[44] = 0x02; /* Copy Block to Block device */
1104 	p[45] = 0xe4; /* Identification descriptor target descriptor */
1105 
1106 	/*
1107 	 * AVAILABLE DATA (n-3)
1108 	 */
1109 	put_unaligned_be32(42, &p[0]);
1110 
1111 	transport_kunmap_data_sg(se_cmd);
1112 	target_complete_cmd(se_cmd, GOOD);
1113 
1114 	return TCM_NO_SENSE;
1115 }
1116 
1117 sense_reason_t target_do_receive_copy_results(struct se_cmd *se_cmd)
1118 {
1119 	unsigned char *cdb = &se_cmd->t_task_cdb[0];
1120 	int sa = (cdb[1] & 0x1f), list_id = cdb[2];
1121 	sense_reason_t rc = TCM_NO_SENSE;
1122 
1123 	pr_debug("Entering target_do_receive_copy_results: SA: 0x%02x, List ID:"
1124 		" 0x%02x, AL: %u\n", sa, list_id, se_cmd->data_length);
1125 
1126 	if (list_id != 0) {
1127 		pr_err("Receive Copy Results with non zero list identifier"
1128 		       " not supported\n");
1129 		return TCM_INVALID_CDB_FIELD;
1130 	}
1131 
1132 	switch (sa) {
1133 	case RCR_SA_OPERATING_PARAMETERS:
1134 		rc = target_rcr_operating_parameters(se_cmd);
1135 		break;
1136 	case RCR_SA_COPY_STATUS:
1137 	case RCR_SA_RECEIVE_DATA:
1138 	case RCR_SA_FAILED_SEGMENT_DETAILS:
1139 	default:
1140 		pr_err("Unsupported SA for receive copy results: 0x%02x\n", sa);
1141 		return TCM_INVALID_CDB_FIELD;
1142 	}
1143 
1144 	return rc;
1145 }
1146