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
target_xcopy_gen_naa_ieee(struct se_device * dev,unsigned char * buf)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 /**
59 * target_xcopy_locate_se_dev_e4_iter - compare XCOPY NAA device identifiers
60 *
61 * @se_dev: device being considered for match
62 * @dev_wwn: XCOPY requested NAA dev_wwn
63 * @return: 1 on match, 0 on no-match
64 */
target_xcopy_locate_se_dev_e4_iter(struct se_device * se_dev,const unsigned char * dev_wwn)65 static int target_xcopy_locate_se_dev_e4_iter(struct se_device *se_dev,
66 const unsigned char *dev_wwn)
67 {
68 unsigned char tmp_dev_wwn[XCOPY_NAA_IEEE_REGEX_LEN];
69 int rc;
70
71 if (!se_dev->dev_attrib.emulate_3pc) {
72 pr_debug("XCOPY: emulate_3pc disabled on se_dev %p\n", se_dev);
73 return 0;
74 }
75
76 memset(&tmp_dev_wwn[0], 0, XCOPY_NAA_IEEE_REGEX_LEN);
77 target_xcopy_gen_naa_ieee(se_dev, &tmp_dev_wwn[0]);
78
79 rc = memcmp(&tmp_dev_wwn[0], dev_wwn, XCOPY_NAA_IEEE_REGEX_LEN);
80 if (rc != 0) {
81 pr_debug("XCOPY: skip non-matching: %*ph\n",
82 XCOPY_NAA_IEEE_REGEX_LEN, tmp_dev_wwn);
83 return 0;
84 }
85 pr_debug("XCOPY 0xe4: located se_dev: %p\n", se_dev);
86
87 return 1;
88 }
89
target_xcopy_locate_se_dev_e4(struct se_session * sess,const unsigned char * dev_wwn,struct se_device ** _found_dev,struct percpu_ref ** _found_lun_ref)90 static int target_xcopy_locate_se_dev_e4(struct se_session *sess,
91 const unsigned char *dev_wwn,
92 struct se_device **_found_dev,
93 struct percpu_ref **_found_lun_ref)
94 {
95 struct se_dev_entry *deve;
96 struct se_node_acl *nacl;
97 struct se_lun *this_lun = NULL;
98 struct se_device *found_dev = NULL;
99
100 /* cmd with NULL sess indicates no associated $FABRIC_MOD */
101 if (!sess)
102 goto err_out;
103
104 pr_debug("XCOPY 0xe4: searching for: %*ph\n",
105 XCOPY_NAA_IEEE_REGEX_LEN, dev_wwn);
106
107 nacl = sess->se_node_acl;
108 rcu_read_lock();
109 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
110 struct se_device *this_dev;
111 int rc;
112
113 this_lun = rcu_dereference(deve->se_lun);
114 this_dev = rcu_dereference_raw(this_lun->lun_se_dev);
115
116 rc = target_xcopy_locate_se_dev_e4_iter(this_dev, dev_wwn);
117 if (rc) {
118 if (percpu_ref_tryget_live(&this_lun->lun_ref))
119 found_dev = this_dev;
120 break;
121 }
122 }
123 rcu_read_unlock();
124 if (found_dev == NULL)
125 goto err_out;
126
127 pr_debug("lun_ref held for se_dev: %p se_dev->se_dev_group: %p\n",
128 found_dev, &found_dev->dev_group);
129 *_found_dev = found_dev;
130 *_found_lun_ref = &this_lun->lun_ref;
131 return 0;
132 err_out:
133 pr_debug_ratelimited("Unable to locate 0xe4 descriptor for EXTENDED_COPY\n");
134 return -EINVAL;
135 }
136
target_xcopy_parse_tiddesc_e4(struct se_cmd * se_cmd,struct xcopy_op * xop,unsigned char * p,unsigned short cscd_index)137 static int target_xcopy_parse_tiddesc_e4(struct se_cmd *se_cmd, struct xcopy_op *xop,
138 unsigned char *p, unsigned short cscd_index)
139 {
140 unsigned char *desc = p;
141 unsigned short ript;
142 u8 desig_len;
143 /*
144 * Extract RELATIVE INITIATOR PORT IDENTIFIER
145 */
146 ript = get_unaligned_be16(&desc[2]);
147 pr_debug("XCOPY 0xe4: RELATIVE INITIATOR PORT IDENTIFIER: %hu\n", ript);
148 /*
149 * Check for supported code set, association, and designator type
150 */
151 if ((desc[4] & 0x0f) != 0x1) {
152 pr_err("XCOPY 0xe4: code set of non binary type not supported\n");
153 return -EINVAL;
154 }
155 if ((desc[5] & 0x30) != 0x00) {
156 pr_err("XCOPY 0xe4: association other than LUN not supported\n");
157 return -EINVAL;
158 }
159 if ((desc[5] & 0x0f) != 0x3) {
160 pr_err("XCOPY 0xe4: designator type unsupported: 0x%02x\n",
161 (desc[5] & 0x0f));
162 return -EINVAL;
163 }
164 /*
165 * Check for matching 16 byte length for NAA IEEE Registered Extended
166 * Assigned designator
167 */
168 desig_len = desc[7];
169 if (desig_len != 16) {
170 pr_err("XCOPY 0xe4: invalid desig_len: %d\n", (int)desig_len);
171 return -EINVAL;
172 }
173 pr_debug("XCOPY 0xe4: desig_len: %d\n", (int)desig_len);
174 /*
175 * Check for NAA IEEE Registered Extended Assigned header..
176 */
177 if ((desc[8] & 0xf0) != 0x60) {
178 pr_err("XCOPY 0xe4: Unsupported DESIGNATOR TYPE: 0x%02x\n",
179 (desc[8] & 0xf0));
180 return -EINVAL;
181 }
182
183 if (cscd_index != xop->stdi && cscd_index != xop->dtdi) {
184 pr_debug("XCOPY 0xe4: ignoring CSCD entry %d - neither src nor "
185 "dest\n", cscd_index);
186 return 0;
187 }
188
189 if (cscd_index == xop->stdi) {
190 memcpy(&xop->src_tid_wwn[0], &desc[8], XCOPY_NAA_IEEE_REGEX_LEN);
191 /*
192 * Determine if the source designator matches the local device
193 */
194 if (!memcmp(&xop->local_dev_wwn[0], &xop->src_tid_wwn[0],
195 XCOPY_NAA_IEEE_REGEX_LEN)) {
196 xop->op_origin = XCOL_SOURCE_RECV_OP;
197 xop->src_dev = se_cmd->se_dev;
198 pr_debug("XCOPY 0xe4: Set xop->src_dev %p from source"
199 " received xop\n", xop->src_dev);
200 }
201 }
202
203 if (cscd_index == xop->dtdi) {
204 memcpy(&xop->dst_tid_wwn[0], &desc[8], XCOPY_NAA_IEEE_REGEX_LEN);
205 /*
206 * Determine if the destination designator matches the local
207 * device. If @cscd_index corresponds to both source (stdi) and
208 * destination (dtdi), or dtdi comes after stdi, then
209 * XCOL_DEST_RECV_OP wins.
210 */
211 if (!memcmp(&xop->local_dev_wwn[0], &xop->dst_tid_wwn[0],
212 XCOPY_NAA_IEEE_REGEX_LEN)) {
213 xop->op_origin = XCOL_DEST_RECV_OP;
214 xop->dst_dev = se_cmd->se_dev;
215 pr_debug("XCOPY 0xe4: Set xop->dst_dev: %p from destination"
216 " received xop\n", xop->dst_dev);
217 }
218 }
219
220 return 0;
221 }
222
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)223 static int target_xcopy_parse_target_descriptors(struct se_cmd *se_cmd,
224 struct xcopy_op *xop, unsigned char *p,
225 unsigned short tdll, sense_reason_t *sense_ret)
226 {
227 struct se_device *local_dev = se_cmd->se_dev;
228 unsigned char *desc = p;
229 int offset = tdll % XCOPY_TARGET_DESC_LEN, rc;
230 unsigned short cscd_index = 0;
231 unsigned short start = 0;
232
233 *sense_ret = TCM_INVALID_PARAMETER_LIST;
234
235 if (offset != 0) {
236 pr_err("XCOPY target descriptor list length is not"
237 " multiple of %d\n", XCOPY_TARGET_DESC_LEN);
238 *sense_ret = TCM_UNSUPPORTED_TARGET_DESC_TYPE_CODE;
239 return -EINVAL;
240 }
241 if (tdll > RCR_OP_MAX_TARGET_DESC_COUNT * XCOPY_TARGET_DESC_LEN) {
242 pr_err("XCOPY target descriptor supports a maximum"
243 " two src/dest descriptors, tdll: %hu too large..\n", tdll);
244 /* spc4r37 6.4.3.4 CSCD DESCRIPTOR LIST LENGTH field */
245 *sense_ret = TCM_TOO_MANY_TARGET_DESCS;
246 return -EINVAL;
247 }
248 /*
249 * Generate an IEEE Registered Extended designator based upon the
250 * se_device the XCOPY was received upon..
251 */
252 memset(&xop->local_dev_wwn[0], 0, XCOPY_NAA_IEEE_REGEX_LEN);
253 target_xcopy_gen_naa_ieee(local_dev, &xop->local_dev_wwn[0]);
254
255 while (start < tdll) {
256 /*
257 * Check target descriptor identification with 0xE4 type, and
258 * compare the current index with the CSCD descriptor IDs in
259 * the segment descriptor. Use VPD 0x83 WWPN matching ..
260 */
261 switch (desc[0]) {
262 case 0xe4:
263 rc = target_xcopy_parse_tiddesc_e4(se_cmd, xop,
264 &desc[0], cscd_index);
265 if (rc != 0)
266 goto out;
267 start += XCOPY_TARGET_DESC_LEN;
268 desc += XCOPY_TARGET_DESC_LEN;
269 cscd_index++;
270 break;
271 default:
272 pr_err("XCOPY unsupported descriptor type code:"
273 " 0x%02x\n", desc[0]);
274 *sense_ret = TCM_UNSUPPORTED_TARGET_DESC_TYPE_CODE;
275 goto out;
276 }
277 }
278
279 switch (xop->op_origin) {
280 case XCOL_SOURCE_RECV_OP:
281 rc = target_xcopy_locate_se_dev_e4(se_cmd->se_sess,
282 xop->dst_tid_wwn,
283 &xop->dst_dev,
284 &xop->remote_lun_ref);
285 break;
286 case XCOL_DEST_RECV_OP:
287 rc = target_xcopy_locate_se_dev_e4(se_cmd->se_sess,
288 xop->src_tid_wwn,
289 &xop->src_dev,
290 &xop->remote_lun_ref);
291 break;
292 default:
293 pr_err("XCOPY CSCD descriptor IDs not found in CSCD list - "
294 "stdi: %hu dtdi: %hu\n", xop->stdi, xop->dtdi);
295 rc = -EINVAL;
296 break;
297 }
298 /*
299 * If a matching IEEE NAA 0x83 descriptor for the requested device
300 * is not located on this node, return COPY_ABORTED with ASQ/ASQC
301 * 0x0d/0x02 - COPY_TARGET_DEVICE_NOT_REACHABLE to request the
302 * initiator to fall back to normal copy method.
303 */
304 if (rc < 0) {
305 *sense_ret = TCM_COPY_TARGET_DEVICE_NOT_REACHABLE;
306 goto out;
307 }
308
309 pr_debug("XCOPY TGT desc: Source dev: %p NAA IEEE WWN: 0x%16phN\n",
310 xop->src_dev, &xop->src_tid_wwn[0]);
311 pr_debug("XCOPY TGT desc: Dest dev: %p NAA IEEE WWN: 0x%16phN\n",
312 xop->dst_dev, &xop->dst_tid_wwn[0]);
313
314 return cscd_index;
315
316 out:
317 return -EINVAL;
318 }
319
target_xcopy_parse_segdesc_02(struct se_cmd * se_cmd,struct xcopy_op * xop,unsigned char * p)320 static int target_xcopy_parse_segdesc_02(struct se_cmd *se_cmd, struct xcopy_op *xop,
321 unsigned char *p)
322 {
323 unsigned char *desc = p;
324 int dc = (desc[1] & 0x02);
325 unsigned short desc_len;
326
327 desc_len = get_unaligned_be16(&desc[2]);
328 if (desc_len != 0x18) {
329 pr_err("XCOPY segment desc 0x02: Illegal desc_len:"
330 " %hu\n", desc_len);
331 return -EINVAL;
332 }
333
334 xop->stdi = get_unaligned_be16(&desc[4]);
335 xop->dtdi = get_unaligned_be16(&desc[6]);
336
337 if (xop->stdi > XCOPY_CSCD_DESC_ID_LIST_OFF_MAX ||
338 xop->dtdi > XCOPY_CSCD_DESC_ID_LIST_OFF_MAX) {
339 pr_err("XCOPY segment desc 0x02: unsupported CSCD ID > 0x%x; stdi: %hu dtdi: %hu\n",
340 XCOPY_CSCD_DESC_ID_LIST_OFF_MAX, xop->stdi, xop->dtdi);
341 return -EINVAL;
342 }
343
344 pr_debug("XCOPY seg desc 0x02: desc_len: %hu stdi: %hu dtdi: %hu, DC: %d\n",
345 desc_len, xop->stdi, xop->dtdi, dc);
346
347 xop->nolb = get_unaligned_be16(&desc[10]);
348 xop->src_lba = get_unaligned_be64(&desc[12]);
349 xop->dst_lba = get_unaligned_be64(&desc[20]);
350 pr_debug("XCOPY seg desc 0x02: nolb: %hu src_lba: %llu dst_lba: %llu\n",
351 xop->nolb, (unsigned long long)xop->src_lba,
352 (unsigned long long)xop->dst_lba);
353
354 if (dc != 0) {
355 xop->dbl = get_unaligned_be24(&desc[29]);
356
357 pr_debug("XCOPY seg desc 0x02: DC=1 w/ dbl: %u\n", xop->dbl);
358 }
359 return 0;
360 }
361
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)362 static int target_xcopy_parse_segment_descriptors(struct se_cmd *se_cmd,
363 struct xcopy_op *xop, unsigned char *p,
364 unsigned int sdll, sense_reason_t *sense_ret)
365 {
366 unsigned char *desc = p;
367 unsigned int start = 0;
368 int offset = sdll % XCOPY_SEGMENT_DESC_LEN, rc, ret = 0;
369
370 *sense_ret = TCM_INVALID_PARAMETER_LIST;
371
372 if (offset != 0) {
373 pr_err("XCOPY segment descriptor list length is not"
374 " multiple of %d\n", XCOPY_SEGMENT_DESC_LEN);
375 *sense_ret = TCM_UNSUPPORTED_SEGMENT_DESC_TYPE_CODE;
376 return -EINVAL;
377 }
378 if (sdll > RCR_OP_MAX_SG_DESC_COUNT * XCOPY_SEGMENT_DESC_LEN) {
379 pr_err("XCOPY supports %u segment descriptor(s), sdll: %u too"
380 " large..\n", RCR_OP_MAX_SG_DESC_COUNT, sdll);
381 /* spc4r37 6.4.3.5 SEGMENT DESCRIPTOR LIST LENGTH field */
382 *sense_ret = TCM_TOO_MANY_SEGMENT_DESCS;
383 return -EINVAL;
384 }
385
386 while (start < sdll) {
387 /*
388 * Check segment descriptor type code for block -> block
389 */
390 switch (desc[0]) {
391 case 0x02:
392 rc = target_xcopy_parse_segdesc_02(se_cmd, xop, desc);
393 if (rc < 0)
394 goto out;
395
396 ret++;
397 start += XCOPY_SEGMENT_DESC_LEN;
398 desc += XCOPY_SEGMENT_DESC_LEN;
399 break;
400 default:
401 pr_err("XCOPY unsupported segment descriptor"
402 "type: 0x%02x\n", desc[0]);
403 *sense_ret = TCM_UNSUPPORTED_SEGMENT_DESC_TYPE_CODE;
404 goto out;
405 }
406 }
407
408 return ret;
409
410 out:
411 return -EINVAL;
412 }
413
414 /*
415 * Start xcopy_pt ops
416 */
417
418 struct xcopy_pt_cmd {
419 bool remote_port;
420 struct se_cmd se_cmd;
421 struct xcopy_op *xcopy_op;
422 struct completion xpt_passthrough_sem;
423 unsigned char sense_buffer[TRANSPORT_SENSE_BUFFER];
424 };
425
426 struct se_portal_group xcopy_pt_tpg;
427 static struct se_session xcopy_pt_sess;
428 static struct se_node_acl xcopy_pt_nacl;
429
xcopy_pt_get_fabric_name(void)430 static char *xcopy_pt_get_fabric_name(void)
431 {
432 return "xcopy-pt";
433 }
434
xcopy_pt_get_cmd_state(struct se_cmd * se_cmd)435 static int xcopy_pt_get_cmd_state(struct se_cmd *se_cmd)
436 {
437 return 0;
438 }
439
xcopy_pt_undepend_remotedev(struct xcopy_op * xop)440 static void xcopy_pt_undepend_remotedev(struct xcopy_op *xop)
441 {
442 if (xop->op_origin == XCOL_SOURCE_RECV_OP)
443 pr_debug("putting dst lun_ref for %p\n", xop->dst_dev);
444 else
445 pr_debug("putting src lun_ref for %p\n", xop->src_dev);
446
447 percpu_ref_put(xop->remote_lun_ref);
448 }
449
xcopy_pt_release_cmd(struct se_cmd * se_cmd)450 static void xcopy_pt_release_cmd(struct se_cmd *se_cmd)
451 {
452 struct xcopy_pt_cmd *xpt_cmd = container_of(se_cmd,
453 struct xcopy_pt_cmd, se_cmd);
454
455 kfree(xpt_cmd);
456 }
457
xcopy_pt_check_stop_free(struct se_cmd * se_cmd)458 static int xcopy_pt_check_stop_free(struct se_cmd *se_cmd)
459 {
460 struct xcopy_pt_cmd *xpt_cmd = container_of(se_cmd,
461 struct xcopy_pt_cmd, se_cmd);
462
463 complete(&xpt_cmd->xpt_passthrough_sem);
464 return 0;
465 }
466
xcopy_pt_write_pending(struct se_cmd * se_cmd)467 static int xcopy_pt_write_pending(struct se_cmd *se_cmd)
468 {
469 return 0;
470 }
471
xcopy_pt_write_pending_status(struct se_cmd * se_cmd)472 static int xcopy_pt_write_pending_status(struct se_cmd *se_cmd)
473 {
474 return 0;
475 }
476
xcopy_pt_queue_data_in(struct se_cmd * se_cmd)477 static int xcopy_pt_queue_data_in(struct se_cmd *se_cmd)
478 {
479 return 0;
480 }
481
xcopy_pt_queue_status(struct se_cmd * se_cmd)482 static int xcopy_pt_queue_status(struct se_cmd *se_cmd)
483 {
484 return 0;
485 }
486
487 static const struct target_core_fabric_ops xcopy_pt_tfo = {
488 .get_fabric_name = xcopy_pt_get_fabric_name,
489 .get_cmd_state = xcopy_pt_get_cmd_state,
490 .release_cmd = xcopy_pt_release_cmd,
491 .check_stop_free = xcopy_pt_check_stop_free,
492 .write_pending = xcopy_pt_write_pending,
493 .write_pending_status = xcopy_pt_write_pending_status,
494 .queue_data_in = xcopy_pt_queue_data_in,
495 .queue_status = xcopy_pt_queue_status,
496 };
497
498 /*
499 * End xcopy_pt_ops
500 */
501
target_xcopy_setup_pt(void)502 int target_xcopy_setup_pt(void)
503 {
504 int ret;
505
506 xcopy_wq = alloc_workqueue("xcopy_wq", WQ_MEM_RECLAIM, 0);
507 if (!xcopy_wq) {
508 pr_err("Unable to allocate xcopy_wq\n");
509 return -ENOMEM;
510 }
511
512 memset(&xcopy_pt_tpg, 0, sizeof(struct se_portal_group));
513 INIT_LIST_HEAD(&xcopy_pt_tpg.se_tpg_node);
514 INIT_LIST_HEAD(&xcopy_pt_tpg.acl_node_list);
515 INIT_LIST_HEAD(&xcopy_pt_tpg.tpg_sess_list);
516
517 xcopy_pt_tpg.se_tpg_tfo = &xcopy_pt_tfo;
518
519 memset(&xcopy_pt_nacl, 0, sizeof(struct se_node_acl));
520 INIT_LIST_HEAD(&xcopy_pt_nacl.acl_list);
521 INIT_LIST_HEAD(&xcopy_pt_nacl.acl_sess_list);
522 memset(&xcopy_pt_sess, 0, sizeof(struct se_session));
523 ret = transport_init_session(&xcopy_pt_sess);
524 if (ret < 0)
525 return ret;
526
527 xcopy_pt_nacl.se_tpg = &xcopy_pt_tpg;
528 xcopy_pt_nacl.nacl_sess = &xcopy_pt_sess;
529
530 xcopy_pt_sess.se_tpg = &xcopy_pt_tpg;
531 xcopy_pt_sess.se_node_acl = &xcopy_pt_nacl;
532
533 return 0;
534 }
535
target_xcopy_release_pt(void)536 void target_xcopy_release_pt(void)
537 {
538 if (xcopy_wq)
539 destroy_workqueue(xcopy_wq);
540 }
541
target_xcopy_setup_pt_port(struct xcopy_pt_cmd * xpt_cmd,struct xcopy_op * xop,bool remote_port)542 static void target_xcopy_setup_pt_port(
543 struct xcopy_pt_cmd *xpt_cmd,
544 struct xcopy_op *xop,
545 bool remote_port)
546 {
547 struct se_cmd *ec_cmd = xop->xop_se_cmd;
548 struct se_cmd *pt_cmd = &xpt_cmd->se_cmd;
549
550 if (xop->op_origin == XCOL_SOURCE_RECV_OP) {
551 /*
552 * Honor destination port reservations for X-COPY PUSH emulation
553 * when CDB is received on local source port, and READs blocks to
554 * WRITE on remote destination port.
555 */
556 if (remote_port) {
557 xpt_cmd->remote_port = remote_port;
558 } else {
559 pt_cmd->se_lun = ec_cmd->se_lun;
560 pt_cmd->se_dev = ec_cmd->se_dev;
561
562 pr_debug("Honoring local SRC port from ec_cmd->se_dev:"
563 " %p\n", pt_cmd->se_dev);
564 pt_cmd->se_lun = ec_cmd->se_lun;
565 pr_debug("Honoring local SRC port from ec_cmd->se_lun: %p\n",
566 pt_cmd->se_lun);
567 }
568 } else {
569 /*
570 * Honor source port reservation for X-COPY PULL emulation
571 * when CDB is received on local desintation port, and READs
572 * blocks from the remote source port to WRITE on local
573 * destination port.
574 */
575 if (remote_port) {
576 xpt_cmd->remote_port = remote_port;
577 } else {
578 pt_cmd->se_lun = ec_cmd->se_lun;
579 pt_cmd->se_dev = ec_cmd->se_dev;
580
581 pr_debug("Honoring local DST port from ec_cmd->se_dev:"
582 " %p\n", pt_cmd->se_dev);
583 pt_cmd->se_lun = ec_cmd->se_lun;
584 pr_debug("Honoring local DST port from ec_cmd->se_lun: %p\n",
585 pt_cmd->se_lun);
586 }
587 }
588 }
589
target_xcopy_init_pt_lun(struct se_device * se_dev,struct se_cmd * pt_cmd,bool remote_port)590 static void target_xcopy_init_pt_lun(struct se_device *se_dev,
591 struct se_cmd *pt_cmd, bool remote_port)
592 {
593 /*
594 * Don't allocate + init an pt_cmd->se_lun if honoring local port for
595 * reservations. The pt_cmd->se_lun pointer will be setup from within
596 * target_xcopy_setup_pt_port()
597 */
598 if (remote_port) {
599 pr_debug("Setup emulated se_dev: %p from se_dev\n",
600 pt_cmd->se_dev);
601 pt_cmd->se_lun = &se_dev->xcopy_lun;
602 pt_cmd->se_dev = se_dev;
603 }
604
605 pt_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
606 }
607
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)608 static int target_xcopy_setup_pt_cmd(
609 struct xcopy_pt_cmd *xpt_cmd,
610 struct xcopy_op *xop,
611 struct se_device *se_dev,
612 unsigned char *cdb,
613 bool remote_port,
614 bool alloc_mem)
615 {
616 struct se_cmd *cmd = &xpt_cmd->se_cmd;
617 sense_reason_t sense_rc;
618 int ret = 0, rc;
619 /*
620 * Setup LUN+port to honor reservations based upon xop->op_origin for
621 * X-COPY PUSH or X-COPY PULL based upon where the CDB was received.
622 */
623 target_xcopy_init_pt_lun(se_dev, cmd, remote_port);
624
625 xpt_cmd->xcopy_op = xop;
626 target_xcopy_setup_pt_port(xpt_cmd, xop, remote_port);
627
628 cmd->tag = 0;
629 sense_rc = target_setup_cmd_from_cdb(cmd, cdb);
630 if (sense_rc) {
631 ret = -EINVAL;
632 goto out;
633 }
634
635 if (alloc_mem) {
636 rc = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents,
637 cmd->data_length, false, false);
638 if (rc < 0) {
639 ret = rc;
640 goto out;
641 }
642 /*
643 * Set this bit so that transport_free_pages() allows the
644 * caller to release SGLs + physical memory allocated by
645 * transport_generic_get_mem()..
646 */
647 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
648 } else {
649 /*
650 * Here the previously allocated SGLs for the internal READ
651 * are mapped zero-copy to the internal WRITE.
652 */
653 sense_rc = transport_generic_map_mem_to_cmd(cmd,
654 xop->xop_data_sg, xop->xop_data_nents,
655 NULL, 0);
656 if (sense_rc) {
657 ret = -EINVAL;
658 goto out;
659 }
660
661 pr_debug("Setup PASSTHROUGH_NOALLOC t_data_sg: %p t_data_nents:"
662 " %u\n", cmd->t_data_sg, cmd->t_data_nents);
663 }
664
665 return 0;
666
667 out:
668 return ret;
669 }
670
target_xcopy_issue_pt_cmd(struct xcopy_pt_cmd * xpt_cmd)671 static int target_xcopy_issue_pt_cmd(struct xcopy_pt_cmd *xpt_cmd)
672 {
673 struct se_cmd *se_cmd = &xpt_cmd->se_cmd;
674 sense_reason_t sense_rc;
675
676 sense_rc = transport_generic_new_cmd(se_cmd);
677 if (sense_rc)
678 return -EINVAL;
679
680 if (se_cmd->data_direction == DMA_TO_DEVICE)
681 target_execute_cmd(se_cmd);
682
683 wait_for_completion_interruptible(&xpt_cmd->xpt_passthrough_sem);
684
685 pr_debug("target_xcopy_issue_pt_cmd(): SCSI status: 0x%02x\n",
686 se_cmd->scsi_status);
687
688 return (se_cmd->scsi_status) ? -EINVAL : 0;
689 }
690
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)691 static int target_xcopy_read_source(
692 struct se_cmd *ec_cmd,
693 struct xcopy_op *xop,
694 struct se_device *src_dev,
695 sector_t src_lba,
696 u32 src_sectors)
697 {
698 struct xcopy_pt_cmd *xpt_cmd;
699 struct se_cmd *se_cmd;
700 u32 length = (src_sectors * src_dev->dev_attrib.block_size);
701 int rc;
702 unsigned char cdb[16];
703 bool remote_port = (xop->op_origin == XCOL_DEST_RECV_OP);
704
705 xpt_cmd = kzalloc(sizeof(struct xcopy_pt_cmd), GFP_KERNEL);
706 if (!xpt_cmd) {
707 pr_err("Unable to allocate xcopy_pt_cmd\n");
708 return -ENOMEM;
709 }
710 init_completion(&xpt_cmd->xpt_passthrough_sem);
711 se_cmd = &xpt_cmd->se_cmd;
712
713 memset(&cdb[0], 0, 16);
714 cdb[0] = READ_16;
715 put_unaligned_be64(src_lba, &cdb[2]);
716 put_unaligned_be32(src_sectors, &cdb[10]);
717 pr_debug("XCOPY: Built READ_16: LBA: %llu Sectors: %u Length: %u\n",
718 (unsigned long long)src_lba, src_sectors, length);
719
720 transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, &xcopy_pt_sess, length,
721 DMA_FROM_DEVICE, 0, &xpt_cmd->sense_buffer[0]);
722 xop->src_pt_cmd = xpt_cmd;
723
724 rc = target_xcopy_setup_pt_cmd(xpt_cmd, xop, src_dev, &cdb[0],
725 remote_port, true);
726 if (rc < 0) {
727 ec_cmd->scsi_status = xpt_cmd->se_cmd.scsi_status;
728 transport_generic_free_cmd(se_cmd, 0);
729 return rc;
730 }
731
732 xop->xop_data_sg = se_cmd->t_data_sg;
733 xop->xop_data_nents = se_cmd->t_data_nents;
734 pr_debug("XCOPY-READ: Saved xop->xop_data_sg: %p, num: %u for READ"
735 " memory\n", xop->xop_data_sg, xop->xop_data_nents);
736
737 rc = target_xcopy_issue_pt_cmd(xpt_cmd);
738 if (rc < 0) {
739 ec_cmd->scsi_status = xpt_cmd->se_cmd.scsi_status;
740 transport_generic_free_cmd(se_cmd, 0);
741 return rc;
742 }
743 /*
744 * Clear off the allocated t_data_sg, that has been saved for
745 * zero-copy WRITE submission reuse in struct xcopy_op..
746 */
747 se_cmd->t_data_sg = NULL;
748 se_cmd->t_data_nents = 0;
749
750 return 0;
751 }
752
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)753 static int target_xcopy_write_destination(
754 struct se_cmd *ec_cmd,
755 struct xcopy_op *xop,
756 struct se_device *dst_dev,
757 sector_t dst_lba,
758 u32 dst_sectors)
759 {
760 struct xcopy_pt_cmd *xpt_cmd;
761 struct se_cmd *se_cmd;
762 u32 length = (dst_sectors * dst_dev->dev_attrib.block_size);
763 int rc;
764 unsigned char cdb[16];
765 bool remote_port = (xop->op_origin == XCOL_SOURCE_RECV_OP);
766
767 xpt_cmd = kzalloc(sizeof(struct xcopy_pt_cmd), GFP_KERNEL);
768 if (!xpt_cmd) {
769 pr_err("Unable to allocate xcopy_pt_cmd\n");
770 return -ENOMEM;
771 }
772 init_completion(&xpt_cmd->xpt_passthrough_sem);
773 se_cmd = &xpt_cmd->se_cmd;
774
775 memset(&cdb[0], 0, 16);
776 cdb[0] = WRITE_16;
777 put_unaligned_be64(dst_lba, &cdb[2]);
778 put_unaligned_be32(dst_sectors, &cdb[10]);
779 pr_debug("XCOPY: Built WRITE_16: LBA: %llu Sectors: %u Length: %u\n",
780 (unsigned long long)dst_lba, dst_sectors, length);
781
782 transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, &xcopy_pt_sess, length,
783 DMA_TO_DEVICE, 0, &xpt_cmd->sense_buffer[0]);
784 xop->dst_pt_cmd = xpt_cmd;
785
786 rc = target_xcopy_setup_pt_cmd(xpt_cmd, xop, dst_dev, &cdb[0],
787 remote_port, false);
788 if (rc < 0) {
789 struct se_cmd *src_cmd = &xop->src_pt_cmd->se_cmd;
790 ec_cmd->scsi_status = xpt_cmd->se_cmd.scsi_status;
791 /*
792 * If the failure happened before the t_mem_list hand-off in
793 * target_xcopy_setup_pt_cmd(), Reset memory + clear flag so that
794 * core releases this memory on error during X-COPY WRITE I/O.
795 */
796 src_cmd->se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
797 src_cmd->t_data_sg = xop->xop_data_sg;
798 src_cmd->t_data_nents = xop->xop_data_nents;
799
800 transport_generic_free_cmd(se_cmd, 0);
801 return rc;
802 }
803
804 rc = target_xcopy_issue_pt_cmd(xpt_cmd);
805 if (rc < 0) {
806 ec_cmd->scsi_status = xpt_cmd->se_cmd.scsi_status;
807 se_cmd->se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
808 transport_generic_free_cmd(se_cmd, 0);
809 return rc;
810 }
811
812 return 0;
813 }
814
target_xcopy_do_work(struct work_struct * work)815 static void target_xcopy_do_work(struct work_struct *work)
816 {
817 struct xcopy_op *xop = container_of(work, struct xcopy_op, xop_work);
818 struct se_cmd *ec_cmd = xop->xop_se_cmd;
819 struct se_device *src_dev, *dst_dev;
820 sector_t src_lba, dst_lba, end_lba;
821 unsigned int max_sectors;
822 int rc = 0;
823 unsigned short nolb, cur_nolb, max_nolb, copied_nolb = 0;
824
825 if (target_parse_xcopy_cmd(xop) != TCM_NO_SENSE)
826 goto err_free;
827
828 if (WARN_ON_ONCE(!xop->src_dev) || WARN_ON_ONCE(!xop->dst_dev))
829 goto err_free;
830
831 src_dev = xop->src_dev;
832 dst_dev = xop->dst_dev;
833 src_lba = xop->src_lba;
834 dst_lba = xop->dst_lba;
835 nolb = xop->nolb;
836 end_lba = src_lba + nolb;
837 /*
838 * Break up XCOPY I/O into hw_max_sectors sized I/O based on the
839 * smallest max_sectors between src_dev + dev_dev, or
840 */
841 max_sectors = min(src_dev->dev_attrib.hw_max_sectors,
842 dst_dev->dev_attrib.hw_max_sectors);
843 max_sectors = min_t(u32, max_sectors, XCOPY_MAX_SECTORS);
844
845 max_nolb = min_t(u16, max_sectors, ((u16)(~0U)));
846
847 pr_debug("target_xcopy_do_work: nolb: %hu, max_nolb: %hu end_lba: %llu\n",
848 nolb, max_nolb, (unsigned long long)end_lba);
849 pr_debug("target_xcopy_do_work: Starting src_lba: %llu, dst_lba: %llu\n",
850 (unsigned long long)src_lba, (unsigned long long)dst_lba);
851
852 while (src_lba < end_lba) {
853 cur_nolb = min(nolb, max_nolb);
854
855 pr_debug("target_xcopy_do_work: Calling read src_dev: %p src_lba: %llu,"
856 " cur_nolb: %hu\n", src_dev, (unsigned long long)src_lba, cur_nolb);
857
858 rc = target_xcopy_read_source(ec_cmd, xop, src_dev, src_lba, cur_nolb);
859 if (rc < 0)
860 goto out;
861
862 src_lba += cur_nolb;
863 pr_debug("target_xcopy_do_work: Incremented READ src_lba to %llu\n",
864 (unsigned long long)src_lba);
865
866 pr_debug("target_xcopy_do_work: Calling write dst_dev: %p dst_lba: %llu,"
867 " cur_nolb: %hu\n", dst_dev, (unsigned long long)dst_lba, cur_nolb);
868
869 rc = target_xcopy_write_destination(ec_cmd, xop, dst_dev,
870 dst_lba, cur_nolb);
871 if (rc < 0) {
872 transport_generic_free_cmd(&xop->src_pt_cmd->se_cmd, 0);
873 goto out;
874 }
875
876 dst_lba += cur_nolb;
877 pr_debug("target_xcopy_do_work: Incremented WRITE dst_lba to %llu\n",
878 (unsigned long long)dst_lba);
879
880 copied_nolb += cur_nolb;
881 nolb -= cur_nolb;
882
883 transport_generic_free_cmd(&xop->src_pt_cmd->se_cmd, 0);
884 xop->dst_pt_cmd->se_cmd.se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
885
886 transport_generic_free_cmd(&xop->dst_pt_cmd->se_cmd, 0);
887 }
888
889 xcopy_pt_undepend_remotedev(xop);
890 kfree(xop);
891
892 pr_debug("target_xcopy_do_work: Final src_lba: %llu, dst_lba: %llu\n",
893 (unsigned long long)src_lba, (unsigned long long)dst_lba);
894 pr_debug("target_xcopy_do_work: Blocks copied: %hu, Bytes Copied: %u\n",
895 copied_nolb, copied_nolb * dst_dev->dev_attrib.block_size);
896
897 pr_debug("target_xcopy_do_work: Setting X-COPY GOOD status -> sending response\n");
898 target_complete_cmd(ec_cmd, SAM_STAT_GOOD);
899 return;
900
901 out:
902 xcopy_pt_undepend_remotedev(xop);
903
904 err_free:
905 kfree(xop);
906 /*
907 * Don't override an error scsi status if it has already been set
908 */
909 if (ec_cmd->scsi_status == SAM_STAT_GOOD) {
910 pr_warn_ratelimited("target_xcopy_do_work: rc: %d, Setting X-COPY"
911 " CHECK_CONDITION -> sending response\n", rc);
912 ec_cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
913 }
914 target_complete_cmd(ec_cmd, ec_cmd->scsi_status);
915 }
916
917 /*
918 * Returns TCM_NO_SENSE upon success or a sense code != TCM_NO_SENSE if parsing
919 * fails.
920 */
target_parse_xcopy_cmd(struct xcopy_op * xop)921 static sense_reason_t target_parse_xcopy_cmd(struct xcopy_op *xop)
922 {
923 struct se_cmd *se_cmd = xop->xop_se_cmd;
924 unsigned char *p = NULL, *seg_desc;
925 unsigned int list_id, list_id_usage, sdll, inline_dl;
926 sense_reason_t ret = TCM_INVALID_PARAMETER_LIST;
927 int rc;
928 unsigned short tdll;
929
930 p = transport_kmap_data_sg(se_cmd);
931 if (!p) {
932 pr_err("transport_kmap_data_sg() failed in target_do_xcopy\n");
933 return TCM_OUT_OF_RESOURCES;
934 }
935
936 list_id = p[0];
937 list_id_usage = (p[1] & 0x18) >> 3;
938
939 /*
940 * Determine TARGET DESCRIPTOR LIST LENGTH + SEGMENT DESCRIPTOR LIST LENGTH
941 */
942 tdll = get_unaligned_be16(&p[2]);
943 sdll = get_unaligned_be32(&p[8]);
944 if (tdll + sdll > RCR_OP_MAX_DESC_LIST_LEN) {
945 pr_err("XCOPY descriptor list length %u exceeds maximum %u\n",
946 tdll + sdll, RCR_OP_MAX_DESC_LIST_LEN);
947 ret = TCM_PARAMETER_LIST_LENGTH_ERROR;
948 goto out;
949 }
950
951 inline_dl = get_unaligned_be32(&p[12]);
952 if (inline_dl != 0) {
953 pr_err("XCOPY with non zero inline data length\n");
954 goto out;
955 }
956
957 if (se_cmd->data_length < (XCOPY_HDR_LEN + tdll + sdll + inline_dl)) {
958 pr_err("XCOPY parameter truncation: data length %u too small "
959 "for tdll: %hu sdll: %u inline_dl: %u\n",
960 se_cmd->data_length, tdll, sdll, inline_dl);
961 ret = TCM_PARAMETER_LIST_LENGTH_ERROR;
962 goto out;
963 }
964
965 pr_debug("Processing XCOPY with list_id: 0x%02x list_id_usage: 0x%02x"
966 " tdll: %hu sdll: %u inline_dl: %u\n", list_id, list_id_usage,
967 tdll, sdll, inline_dl);
968
969 /*
970 * skip over the target descriptors until segment descriptors
971 * have been passed - CSCD ids are needed to determine src and dest.
972 */
973 seg_desc = &p[16] + tdll;
974
975 rc = target_xcopy_parse_segment_descriptors(se_cmd, xop, seg_desc,
976 sdll, &ret);
977 if (rc <= 0)
978 goto out;
979
980 pr_debug("XCOPY: Processed %d segment descriptors, length: %u\n", rc,
981 rc * XCOPY_SEGMENT_DESC_LEN);
982
983 rc = target_xcopy_parse_target_descriptors(se_cmd, xop, &p[16], tdll, &ret);
984 if (rc <= 0)
985 goto out;
986
987 if (xop->src_dev->dev_attrib.block_size !=
988 xop->dst_dev->dev_attrib.block_size) {
989 pr_err("XCOPY: Non matching src_dev block_size: %u + dst_dev"
990 " block_size: %u currently unsupported\n",
991 xop->src_dev->dev_attrib.block_size,
992 xop->dst_dev->dev_attrib.block_size);
993 xcopy_pt_undepend_remotedev(xop);
994 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
995 goto out;
996 }
997
998 pr_debug("XCOPY: Processed %d target descriptors, length: %u\n", rc,
999 rc * XCOPY_TARGET_DESC_LEN);
1000 transport_kunmap_data_sg(se_cmd);
1001 return TCM_NO_SENSE;
1002
1003 out:
1004 if (p)
1005 transport_kunmap_data_sg(se_cmd);
1006 return ret;
1007 }
1008
target_do_xcopy(struct se_cmd * se_cmd)1009 sense_reason_t target_do_xcopy(struct se_cmd *se_cmd)
1010 {
1011 struct se_device *dev = se_cmd->se_dev;
1012 struct xcopy_op *xop;
1013 unsigned int sa;
1014
1015 if (!dev->dev_attrib.emulate_3pc) {
1016 pr_err("EXTENDED_COPY operation explicitly disabled\n");
1017 return TCM_UNSUPPORTED_SCSI_OPCODE;
1018 }
1019
1020 sa = se_cmd->t_task_cdb[1] & 0x1f;
1021 if (sa != 0x00) {
1022 pr_err("EXTENDED_COPY(LID4) not supported\n");
1023 return TCM_UNSUPPORTED_SCSI_OPCODE;
1024 }
1025
1026 if (se_cmd->data_length == 0) {
1027 target_complete_cmd(se_cmd, SAM_STAT_GOOD);
1028 return TCM_NO_SENSE;
1029 }
1030 if (se_cmd->data_length < XCOPY_HDR_LEN) {
1031 pr_err("XCOPY parameter truncation: length %u < hdr_len %u\n",
1032 se_cmd->data_length, XCOPY_HDR_LEN);
1033 return TCM_PARAMETER_LIST_LENGTH_ERROR;
1034 }
1035
1036 xop = kzalloc(sizeof(struct xcopy_op), GFP_KERNEL);
1037 if (!xop)
1038 goto err;
1039 xop->xop_se_cmd = se_cmd;
1040 INIT_WORK(&xop->xop_work, target_xcopy_do_work);
1041 if (WARN_ON_ONCE(!queue_work(xcopy_wq, &xop->xop_work)))
1042 goto free;
1043 return TCM_NO_SENSE;
1044
1045 free:
1046 kfree(xop);
1047
1048 err:
1049 return TCM_OUT_OF_RESOURCES;
1050 }
1051
target_rcr_operating_parameters(struct se_cmd * se_cmd)1052 static sense_reason_t target_rcr_operating_parameters(struct se_cmd *se_cmd)
1053 {
1054 unsigned char *p;
1055
1056 p = transport_kmap_data_sg(se_cmd);
1057 if (!p) {
1058 pr_err("transport_kmap_data_sg failed in"
1059 " target_rcr_operating_parameters\n");
1060 return TCM_OUT_OF_RESOURCES;
1061 }
1062
1063 if (se_cmd->data_length < 54) {
1064 pr_err("Receive Copy Results Op Parameters length"
1065 " too small: %u\n", se_cmd->data_length);
1066 transport_kunmap_data_sg(se_cmd);
1067 return TCM_INVALID_CDB_FIELD;
1068 }
1069 /*
1070 * Set SNLID=1 (Supports no List ID)
1071 */
1072 p[4] = 0x1;
1073 /*
1074 * MAXIMUM TARGET DESCRIPTOR COUNT
1075 */
1076 put_unaligned_be16(RCR_OP_MAX_TARGET_DESC_COUNT, &p[8]);
1077 /*
1078 * MAXIMUM SEGMENT DESCRIPTOR COUNT
1079 */
1080 put_unaligned_be16(RCR_OP_MAX_SG_DESC_COUNT, &p[10]);
1081 /*
1082 * MAXIMUM DESCRIPTOR LIST LENGTH
1083 */
1084 put_unaligned_be32(RCR_OP_MAX_DESC_LIST_LEN, &p[12]);
1085 /*
1086 * MAXIMUM SEGMENT LENGTH
1087 */
1088 put_unaligned_be32(RCR_OP_MAX_SEGMENT_LEN, &p[16]);
1089 /*
1090 * MAXIMUM INLINE DATA LENGTH for SA 0x04 (NOT SUPPORTED)
1091 */
1092 put_unaligned_be32(0x0, &p[20]);
1093 /*
1094 * HELD DATA LIMIT
1095 */
1096 put_unaligned_be32(0x0, &p[24]);
1097 /*
1098 * MAXIMUM STREAM DEVICE TRANSFER SIZE
1099 */
1100 put_unaligned_be32(0x0, &p[28]);
1101 /*
1102 * TOTAL CONCURRENT COPIES
1103 */
1104 put_unaligned_be16(RCR_OP_TOTAL_CONCURR_COPIES, &p[34]);
1105 /*
1106 * MAXIMUM CONCURRENT COPIES
1107 */
1108 p[36] = RCR_OP_MAX_CONCURR_COPIES;
1109 /*
1110 * DATA SEGMENT GRANULARITY (log 2)
1111 */
1112 p[37] = RCR_OP_DATA_SEG_GRAN_LOG2;
1113 /*
1114 * INLINE DATA GRANULARITY log 2)
1115 */
1116 p[38] = RCR_OP_INLINE_DATA_GRAN_LOG2;
1117 /*
1118 * HELD DATA GRANULARITY
1119 */
1120 p[39] = RCR_OP_HELD_DATA_GRAN_LOG2;
1121 /*
1122 * IMPLEMENTED DESCRIPTOR LIST LENGTH
1123 */
1124 p[43] = 0x2;
1125 /*
1126 * List of implemented descriptor type codes (ordered)
1127 */
1128 p[44] = 0x02; /* Copy Block to Block device */
1129 p[45] = 0xe4; /* Identification descriptor target descriptor */
1130
1131 /*
1132 * AVAILABLE DATA (n-3)
1133 */
1134 put_unaligned_be32(42, &p[0]);
1135
1136 transport_kunmap_data_sg(se_cmd);
1137 target_complete_cmd(se_cmd, GOOD);
1138
1139 return TCM_NO_SENSE;
1140 }
1141
target_do_receive_copy_results(struct se_cmd * se_cmd)1142 sense_reason_t target_do_receive_copy_results(struct se_cmd *se_cmd)
1143 {
1144 unsigned char *cdb = &se_cmd->t_task_cdb[0];
1145 int sa = (cdb[1] & 0x1f), list_id = cdb[2];
1146 sense_reason_t rc = TCM_NO_SENSE;
1147
1148 pr_debug("Entering target_do_receive_copy_results: SA: 0x%02x, List ID:"
1149 " 0x%02x, AL: %u\n", sa, list_id, se_cmd->data_length);
1150
1151 if (list_id != 0) {
1152 pr_err("Receive Copy Results with non zero list identifier"
1153 " not supported\n");
1154 return TCM_INVALID_CDB_FIELD;
1155 }
1156
1157 switch (sa) {
1158 case RCR_SA_OPERATING_PARAMETERS:
1159 rc = target_rcr_operating_parameters(se_cmd);
1160 break;
1161 case RCR_SA_COPY_STATUS:
1162 case RCR_SA_RECEIVE_DATA:
1163 case RCR_SA_FAILED_SEGMENT_DETAILS:
1164 default:
1165 pr_err("Unsupported SA for receive copy results: 0x%02x\n", sa);
1166 return TCM_INVALID_CDB_FIELD;
1167 }
1168
1169 return rc;
1170 }
1171