GNU Linux-libre 4.19.263-gnu1
[releases.git] / drivers / target / target_core_xcopy.c
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 /**
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  */
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
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
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
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
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
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
430 static char *xcopy_pt_get_fabric_name(void)
431 {
432         return "xcopy-pt";
433 }
434
435 static int xcopy_pt_get_cmd_state(struct se_cmd *se_cmd)
436 {
437         return 0;
438 }
439
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
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
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
467 static int xcopy_pt_write_pending(struct se_cmd *se_cmd)
468 {
469         return 0;
470 }
471
472 static int xcopy_pt_write_pending_status(struct se_cmd *se_cmd)
473 {
474         return 0;
475 }
476
477 static int xcopy_pt_queue_data_in(struct se_cmd *se_cmd)
478 {
479         return 0;
480 }
481
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
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
536 void target_xcopy_release_pt(void)
537 {
538         if (xcopy_wq)
539                 destroy_workqueue(xcopy_wq);
540 }
541
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
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
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
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
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
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
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  */
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
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
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
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 }