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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / drivers / target / target_core_xcopy.c
blob425c1070de08143e19a01efa459a62dae5186788
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*******************************************************************************
3 * Filename: target_core_xcopy.c
4 *
5 * This file contains support for SPC-4 Extended-Copy offload with generic
6 * TCM backends.
7 *
8 * Copyright (c) 2011-2013 Datera, Inc. All rights reserved.
9 *
10 * Author:
11 * Nicholas A. Bellinger <nab@daterainc.com>
12 *
13 ******************************************************************************/
14
15 #include <linux/slab.h>
16 #include <linux/spinlock.h>
17 #include <linux/list.h>
18 #include <linux/configfs.h>
19 #include <linux/ratelimit.h>
20 #include <scsi/scsi_proto.h>
21 #include <asm/unaligned.h>
22
23 #include <target/target_core_base.h>
24 #include <target/target_core_backend.h>
25 #include <target/target_core_fabric.h>
26
27 #include "target_core_internal.h"
28 #include "target_core_pr.h"
29 #include "target_core_ua.h"
30 #include "target_core_xcopy.h"
31
32 static struct workqueue_struct *xcopy_wq = NULL;
33
34 static sense_reason_t target_parse_xcopy_cmd(struct xcopy_op *xop);
35
36 static int target_xcopy_gen_naa_ieee(struct se_device *dev, unsigned char *buf)
37 {
38 int off = 0;
39
40 buf[off++] = (0x6 << 4);
41 buf[off++] = 0x01;
42 buf[off++] = 0x40;
43 buf[off] = (0x5 << 4);
44
45 spc_parse_naa_6h_vendor_specific(dev, &buf[off]);
46 return 0;
47 }
48
49 struct xcopy_dev_search_info {
50 const unsigned char *dev_wwn;
51 struct se_device *found_dev;
52 };
53
54 static int target_xcopy_locate_se_dev_e4_iter(struct se_device *se_dev,
55 void *data)
56 {
57 struct xcopy_dev_search_info *info = data;
58 unsigned char tmp_dev_wwn[XCOPY_NAA_IEEE_REGEX_LEN];
59 int rc;
60
61 if (!se_dev->dev_attrib.emulate_3pc)
62 return 0;
63
64 memset(&tmp_dev_wwn[0], 0, XCOPY_NAA_IEEE_REGEX_LEN);
65 target_xcopy_gen_naa_ieee(se_dev, &tmp_dev_wwn[0]);
66
67 rc = memcmp(&tmp_dev_wwn[0], info->dev_wwn, XCOPY_NAA_IEEE_REGEX_LEN);
68 if (rc != 0)
69 return 0;
70
71 info->found_dev = se_dev;
72 pr_debug("XCOPY 0xe4: located se_dev: %p\n", se_dev);
73
74 rc = target_depend_item(&se_dev->dev_group.cg_item);
75 if (rc != 0) {
76 pr_err("configfs_depend_item attempt failed: %d for se_dev: %p\n",
77 rc, se_dev);
78 return rc;
79 }
80
81 pr_debug("Called configfs_depend_item for se_dev: %p se_dev->se_dev_group: %p\n",
82 se_dev, &se_dev->dev_group);
83 return 1;
84 }
85
86 static int target_xcopy_locate_se_dev_e4(const unsigned char *dev_wwn,
87 struct se_device **found_dev)
88 {
89 struct xcopy_dev_search_info info;
90 int ret;
91
92 memset(&info, 0, sizeof(info));
93 info.dev_wwn = dev_wwn;
94
95 ret = target_for_each_device(target_xcopy_locate_se_dev_e4_iter, &info);
96 if (ret == 1) {
97 *found_dev = info.found_dev;
98 return 0;
99 } else {
100 pr_debug_ratelimited("Unable to locate 0xe4 descriptor for EXTENDED_COPY\n");
101 return -EINVAL;
102 }
103 }
104
105 static int target_xcopy_parse_tiddesc_e4(struct se_cmd *se_cmd, struct xcopy_op *xop,
106 unsigned char *p, unsigned short cscd_index)
107 {
108 unsigned char *desc = p;
109 unsigned short ript;
110 u8 desig_len;
111 /*
112 * Extract RELATIVE INITIATOR PORT IDENTIFIER
113 */
114 ript = get_unaligned_be16(&desc[2]);
115 pr_debug("XCOPY 0xe4: RELATIVE INITIATOR PORT IDENTIFIER: %hu\n", ript);
116 /*
117 * Check for supported code set, association, and designator type
118 */
119 if ((desc[4] & 0x0f) != 0x1) {
120 pr_err("XCOPY 0xe4: code set of non binary type not supported\n");
121 return -EINVAL;
122 }
123 if ((desc[5] & 0x30) != 0x00) {
124 pr_err("XCOPY 0xe4: association other than LUN not supported\n");
125 return -EINVAL;
126 }
127 if ((desc[5] & 0x0f) != 0x3) {
128 pr_err("XCOPY 0xe4: designator type unsupported: 0x%02x\n",
129 (desc[5] & 0x0f));
130 return -EINVAL;
131 }
132 /*
133 * Check for matching 16 byte length for NAA IEEE Registered Extended
134 * Assigned designator
135 */
136 desig_len = desc[7];
137 if (desig_len != 16) {
138 pr_err("XCOPY 0xe4: invalid desig_len: %d\n", (int)desig_len);
139 return -EINVAL;
140 }
141 pr_debug("XCOPY 0xe4: desig_len: %d\n", (int)desig_len);
142 /*
143 * Check for NAA IEEE Registered Extended Assigned header..
144 */
145 if ((desc[8] & 0xf0) != 0x60) {
146 pr_err("XCOPY 0xe4: Unsupported DESIGNATOR TYPE: 0x%02x\n",
147 (desc[8] & 0xf0));
148 return -EINVAL;
149 }
150
151 if (cscd_index != xop->stdi && cscd_index != xop->dtdi) {
152 pr_debug("XCOPY 0xe4: ignoring CSCD entry %d - neither src nor "
153 "dest\n", cscd_index);
154 return 0;
155 }
156
157 if (cscd_index == xop->stdi) {
158 memcpy(&xop->src_tid_wwn[0], &desc[8], XCOPY_NAA_IEEE_REGEX_LEN);
159 /*
160 * Determine if the source designator matches the local device
161 */
162 if (!memcmp(&xop->local_dev_wwn[0], &xop->src_tid_wwn[0],
163 XCOPY_NAA_IEEE_REGEX_LEN)) {
164 xop->op_origin = XCOL_SOURCE_RECV_OP;
165 xop->src_dev = se_cmd->se_dev;
166 pr_debug("XCOPY 0xe4: Set xop->src_dev %p from source"
167 " received xop\n", xop->src_dev);
168 }
169 }
170
171 if (cscd_index == xop->dtdi) {
172 memcpy(&xop->dst_tid_wwn[0], &desc[8], XCOPY_NAA_IEEE_REGEX_LEN);
173 /*
174 * Determine if the destination designator matches the local
175 * device. If @cscd_index corresponds to both source (stdi) and
176 * destination (dtdi), or dtdi comes after stdi, then
177 * XCOL_DEST_RECV_OP wins.
178 */
179 if (!memcmp(&xop->local_dev_wwn[0], &xop->dst_tid_wwn[0],
180 XCOPY_NAA_IEEE_REGEX_LEN)) {
181 xop->op_origin = XCOL_DEST_RECV_OP;
182 xop->dst_dev = se_cmd->se_dev;
183 pr_debug("XCOPY 0xe4: Set xop->dst_dev: %p from destination"
184 " received xop\n", xop->dst_dev);
185 }
186 }
187
188 return 0;
189 }
190
191 static int target_xcopy_parse_target_descriptors(struct se_cmd *se_cmd,
192 struct xcopy_op *xop, unsigned char *p,
193 unsigned short tdll, sense_reason_t *sense_ret)
194 {
195 struct se_device *local_dev = se_cmd->se_dev;
196 unsigned char *desc = p;
197 int offset = tdll % XCOPY_TARGET_DESC_LEN, rc;
198 unsigned short cscd_index = 0;
199 unsigned short start = 0;
200
201 *sense_ret = TCM_INVALID_PARAMETER_LIST;
202
203 if (offset != 0) {
204 pr_err("XCOPY target descriptor list length is not"
205 " multiple of %d\n", XCOPY_TARGET_DESC_LEN);
206 *sense_ret = TCM_UNSUPPORTED_TARGET_DESC_TYPE_CODE;
207 return -EINVAL;
208 }
209 if (tdll > RCR_OP_MAX_TARGET_DESC_COUNT * XCOPY_TARGET_DESC_LEN) {
210 pr_err("XCOPY target descriptor supports a maximum"
211 " two src/dest descriptors, tdll: %hu too large..\n", tdll);
212 /* spc4r37 6.4.3.4 CSCD DESCRIPTOR LIST LENGTH field */
213 *sense_ret = TCM_TOO_MANY_TARGET_DESCS;
214 return -EINVAL;
215 }
216 /*
217 * Generate an IEEE Registered Extended designator based upon the
218 * se_device the XCOPY was received upon..
219 */
220 memset(&xop->local_dev_wwn[0], 0, XCOPY_NAA_IEEE_REGEX_LEN);
221 target_xcopy_gen_naa_ieee(local_dev, &xop->local_dev_wwn[0]);
222
223 while (start < tdll) {
224 /*
225 * Check target descriptor identification with 0xE4 type, and
226 * compare the current index with the CSCD descriptor IDs in
227 * the segment descriptor. Use VPD 0x83 WWPN matching ..
228 */
229 switch (desc[0]) {
230 case 0xe4:
231 rc = target_xcopy_parse_tiddesc_e4(se_cmd, xop,
232 &desc[0], cscd_index);
233 if (rc != 0)
234 goto out;
235 start += XCOPY_TARGET_DESC_LEN;
236 desc += XCOPY_TARGET_DESC_LEN;
237 cscd_index++;
238 break;
239 default:
240 pr_err("XCOPY unsupported descriptor type code:"
241 " 0x%02x\n", desc[0]);
242 *sense_ret = TCM_UNSUPPORTED_TARGET_DESC_TYPE_CODE;
243 goto out;
244 }
245 }
246
247 switch (xop->op_origin) {
248 case XCOL_SOURCE_RECV_OP:
249 rc = target_xcopy_locate_se_dev_e4(xop->dst_tid_wwn,
250 &xop->dst_dev);
251 break;
252 case XCOL_DEST_RECV_OP:
253 rc = target_xcopy_locate_se_dev_e4(xop->src_tid_wwn,
254 &xop->src_dev);
255 break;
256 default:
257 pr_err("XCOPY CSCD descriptor IDs not found in CSCD list - "
258 "stdi: %hu dtdi: %hu\n", xop->stdi, xop->dtdi);
259 rc = -EINVAL;
260 break;
261 }
262 /*
263 * If a matching IEEE NAA 0x83 descriptor for the requested device
264 * is not located on this node, return COPY_ABORTED with ASQ/ASQC
265 * 0x0d/0x02 - COPY_TARGET_DEVICE_NOT_REACHABLE to request the
266 * initiator to fall back to normal copy method.
267 */
268 if (rc < 0) {
269 *sense_ret = TCM_COPY_TARGET_DEVICE_NOT_REACHABLE;
270 goto out;
271 }
272
273 pr_debug("XCOPY TGT desc: Source dev: %p NAA IEEE WWN: 0x%16phN\n",
274 xop->src_dev, &xop->src_tid_wwn[0]);
275 pr_debug("XCOPY TGT desc: Dest dev: %p NAA IEEE WWN: 0x%16phN\n",
276 xop->dst_dev, &xop->dst_tid_wwn[0]);
277
278 return cscd_index;
279
280 out:
281 return -EINVAL;
282 }
283
284 static int target_xcopy_parse_segdesc_02(struct se_cmd *se_cmd, struct xcopy_op *xop,
285 unsigned char *p)
286 {
287 unsigned char *desc = p;
288 int dc = (desc[1] & 0x02);
289 unsigned short desc_len;
290
291 desc_len = get_unaligned_be16(&desc[2]);
292 if (desc_len != 0x18) {
293 pr_err("XCOPY segment desc 0x02: Illegal desc_len:"
294 " %hu\n", desc_len);
295 return -EINVAL;
296 }
297
298 xop->stdi = get_unaligned_be16(&desc[4]);
299 xop->dtdi = get_unaligned_be16(&desc[6]);
300
301 if (xop->stdi > XCOPY_CSCD_DESC_ID_LIST_OFF_MAX ||
302 xop->dtdi > XCOPY_CSCD_DESC_ID_LIST_OFF_MAX) {
303 pr_err("XCOPY segment desc 0x02: unsupported CSCD ID > 0x%x; stdi: %hu dtdi: %hu\n",
304 XCOPY_CSCD_DESC_ID_LIST_OFF_MAX, xop->stdi, xop->dtdi);
305 return -EINVAL;
306 }
307
308 pr_debug("XCOPY seg desc 0x02: desc_len: %hu stdi: %hu dtdi: %hu, DC: %d\n",
309 desc_len, xop->stdi, xop->dtdi, dc);
310
311 xop->nolb = get_unaligned_be16(&desc[10]);
312 xop->src_lba = get_unaligned_be64(&desc[12]);
313 xop->dst_lba = get_unaligned_be64(&desc[20]);
314 pr_debug("XCOPY seg desc 0x02: nolb: %hu src_lba: %llu dst_lba: %llu\n",
315 xop->nolb, (unsigned long long)xop->src_lba,
316 (unsigned long long)xop->dst_lba);
317
318 if (dc != 0) {
319 xop->dbl = get_unaligned_be24(&desc[29]);
320
321 pr_debug("XCOPY seg desc 0x02: DC=1 w/ dbl: %u\n", xop->dbl);
322 }
323 return 0;
324 }
325
326 static int target_xcopy_parse_segment_descriptors(struct se_cmd *se_cmd,
327 struct xcopy_op *xop, unsigned char *p,
328 unsigned int sdll, sense_reason_t *sense_ret)
329 {
330 unsigned char *desc = p;
331 unsigned int start = 0;
332 int offset = sdll % XCOPY_SEGMENT_DESC_LEN, rc, ret = 0;
333
334 *sense_ret = TCM_INVALID_PARAMETER_LIST;
335
336 if (offset != 0) {
337 pr_err("XCOPY segment descriptor list length is not"
338 " multiple of %d\n", XCOPY_SEGMENT_DESC_LEN);
339 *sense_ret = TCM_UNSUPPORTED_SEGMENT_DESC_TYPE_CODE;
340 return -EINVAL;
341 }
342 if (sdll > RCR_OP_MAX_SG_DESC_COUNT * XCOPY_SEGMENT_DESC_LEN) {
343 pr_err("XCOPY supports %u segment descriptor(s), sdll: %u too"
344 " large..\n", RCR_OP_MAX_SG_DESC_COUNT, sdll);
345 /* spc4r37 6.4.3.5 SEGMENT DESCRIPTOR LIST LENGTH field */
346 *sense_ret = TCM_TOO_MANY_SEGMENT_DESCS;
347 return -EINVAL;
348 }
349
350 while (start < sdll) {
351 /*
352 * Check segment descriptor type code for block -> block
353 */
354 switch (desc[0]) {
355 case 0x02:
356 rc = target_xcopy_parse_segdesc_02(se_cmd, xop, desc);
357 if (rc < 0)
358 goto out;
359
360 ret++;
361 start += XCOPY_SEGMENT_DESC_LEN;
362 desc += XCOPY_SEGMENT_DESC_LEN;
363 break;
364 default:
365 pr_err("XCOPY unsupported segment descriptor"
366 "type: 0x%02x\n", desc[0]);
367 *sense_ret = TCM_UNSUPPORTED_SEGMENT_DESC_TYPE_CODE;
368 goto out;
369 }
370 }
371
372 return ret;
373
374 out:
375 return -EINVAL;
376 }
377
378 /*
379 * Start xcopy_pt ops
380 */
381
382 struct xcopy_pt_cmd {
383 struct se_cmd se_cmd;
384 struct completion xpt_passthrough_sem;
385 unsigned char sense_buffer[TRANSPORT_SENSE_BUFFER];
386 };
387
388 struct se_portal_group xcopy_pt_tpg;
389 static struct se_session xcopy_pt_sess;
390 static struct se_node_acl xcopy_pt_nacl;
391
392 static int xcopy_pt_get_cmd_state(struct se_cmd *se_cmd)
393 {
394 return 0;
395 }
396
397 static void xcopy_pt_undepend_remotedev(struct xcopy_op *xop)
398 {
399 struct se_device *remote_dev;
400
401 if (xop->op_origin == XCOL_SOURCE_RECV_OP)
402 remote_dev = xop->dst_dev;
403 else
404 remote_dev = xop->src_dev;
405
406 pr_debug("Calling configfs_undepend_item for"
407 " remote_dev: %p remote_dev->dev_group: %p\n",
408 remote_dev, &remote_dev->dev_group.cg_item);
409
410 target_undepend_item(&remote_dev->dev_group.cg_item);
411 }
412
413 static void xcopy_pt_release_cmd(struct se_cmd *se_cmd)
414 {
415 struct xcopy_pt_cmd *xpt_cmd = container_of(se_cmd,
416 struct xcopy_pt_cmd, se_cmd);
417
418 kfree(xpt_cmd);
419 }
420
421 static int xcopy_pt_check_stop_free(struct se_cmd *se_cmd)
422 {
423 struct xcopy_pt_cmd *xpt_cmd = container_of(se_cmd,
424 struct xcopy_pt_cmd, se_cmd);
425
426 complete(&xpt_cmd->xpt_passthrough_sem);
427 return 0;
428 }
429
430 static int xcopy_pt_write_pending(struct se_cmd *se_cmd)
431 {
432 return 0;
433 }
434
435 static int xcopy_pt_queue_data_in(struct se_cmd *se_cmd)
436 {
437 return 0;
438 }
439
440 static int xcopy_pt_queue_status(struct se_cmd *se_cmd)
441 {
442 return 0;
443 }
444
445 static const struct target_core_fabric_ops xcopy_pt_tfo = {
446 .fabric_name = "xcopy-pt",
447 .get_cmd_state = xcopy_pt_get_cmd_state,
448 .release_cmd = xcopy_pt_release_cmd,
449 .check_stop_free = xcopy_pt_check_stop_free,
450 .write_pending = xcopy_pt_write_pending,
451 .queue_data_in = xcopy_pt_queue_data_in,
452 .queue_status = xcopy_pt_queue_status,
453 };
454
455 /*
456 * End xcopy_pt_ops
457 */
458
459 int target_xcopy_setup_pt(void)
460 {
461 int ret;
462
463 xcopy_wq = alloc_workqueue("xcopy_wq", WQ_MEM_RECLAIM, 0);
464 if (!xcopy_wq) {
465 pr_err("Unable to allocate xcopy_wq\n");
466 return -ENOMEM;
467 }
468
469 memset(&xcopy_pt_tpg, 0, sizeof(struct se_portal_group));
470 INIT_LIST_HEAD(&xcopy_pt_tpg.acl_node_list);
471 INIT_LIST_HEAD(&xcopy_pt_tpg.tpg_sess_list);
472
473 xcopy_pt_tpg.se_tpg_tfo = &xcopy_pt_tfo;
474
475 memset(&xcopy_pt_nacl, 0, sizeof(struct se_node_acl));
476 INIT_LIST_HEAD(&xcopy_pt_nacl.acl_list);
477 INIT_LIST_HEAD(&xcopy_pt_nacl.acl_sess_list);
478 memset(&xcopy_pt_sess, 0, sizeof(struct se_session));
479 ret = transport_init_session(&xcopy_pt_sess);
480 if (ret < 0)
481 return ret;
482
483 xcopy_pt_nacl.se_tpg = &xcopy_pt_tpg;
484 xcopy_pt_nacl.nacl_sess = &xcopy_pt_sess;
485
486 xcopy_pt_sess.se_tpg = &xcopy_pt_tpg;
487 xcopy_pt_sess.se_node_acl = &xcopy_pt_nacl;
488
489 return 0;
490 }
491
492 void target_xcopy_release_pt(void)
493 {
494 if (xcopy_wq)
495 destroy_workqueue(xcopy_wq);
496 }
497
498 /*
499 * target_xcopy_setup_pt_cmd - set up a pass-through command
500 * @xpt_cmd: Data structure to initialize.
501 * @xop: Describes the XCOPY operation received from an initiator.
502 * @se_dev: Backend device to associate with @xpt_cmd if
503 * @remote_port == true.
504 * @cdb: SCSI CDB to be copied into @xpt_cmd.
505 * @remote_port: If false, use the LUN through which the XCOPY command has
506 * been received. If true, use @se_dev->xcopy_lun.
507 * @alloc_mem: Whether or not to allocate an SGL list.
508 *
509 * Set up a SCSI command (READ or WRITE) that will be used to execute an
510 * XCOPY command.
511 */
512 static int target_xcopy_setup_pt_cmd(
513 struct xcopy_pt_cmd *xpt_cmd,
514 struct xcopy_op *xop,
515 struct se_device *se_dev,
516 unsigned char *cdb,
517 bool remote_port,
518 bool alloc_mem)
519 {
520 struct se_cmd *cmd = &xpt_cmd->se_cmd;
521 sense_reason_t sense_rc;
522 int ret = 0, rc;
523
524 /*
525 * Setup LUN+port to honor reservations based upon xop->op_origin for
526 * X-COPY PUSH or X-COPY PULL based upon where the CDB was received.
527 */
528 if (remote_port) {
529 cmd->se_lun = &se_dev->xcopy_lun;
530 cmd->se_dev = se_dev;
531 } else {
532 cmd->se_lun = xop->xop_se_cmd->se_lun;
533 cmd->se_dev = xop->xop_se_cmd->se_dev;
534 }
535 cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
536
537 cmd->tag = 0;
538 sense_rc = target_setup_cmd_from_cdb(cmd, cdb);
539 if (sense_rc) {
540 ret = -EINVAL;
541 goto out;
542 }
543
544 if (alloc_mem) {
545 rc = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents,
546 cmd->data_length, false, false);
547 if (rc < 0) {
548 ret = rc;
549 goto out;
550 }
551 /*
552 * Set this bit so that transport_free_pages() allows the
553 * caller to release SGLs + physical memory allocated by
554 * transport_generic_get_mem()..
555 */
556 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
557 } else {
558 /*
559 * Here the previously allocated SGLs for the internal READ
560 * are mapped zero-copy to the internal WRITE.
561 */
562 sense_rc = transport_generic_map_mem_to_cmd(cmd,
563 xop->xop_data_sg, xop->xop_data_nents,
564 NULL, 0);
565 if (sense_rc) {
566 ret = -EINVAL;
567 goto out;
568 }
569
570 pr_debug("Setup PASSTHROUGH_NOALLOC t_data_sg: %p t_data_nents:"
571 " %u\n", cmd->t_data_sg, cmd->t_data_nents);
572 }
573
574 return 0;
575
576 out:
577 return ret;
578 }
579
580 static int target_xcopy_issue_pt_cmd(struct xcopy_pt_cmd *xpt_cmd)
581 {
582 struct se_cmd *se_cmd = &xpt_cmd->se_cmd;
583 sense_reason_t sense_rc;
584
585 sense_rc = transport_generic_new_cmd(se_cmd);
586 if (sense_rc)
587 return -EINVAL;
588
589 if (se_cmd->data_direction == DMA_TO_DEVICE)
590 target_execute_cmd(se_cmd);
591
592 wait_for_completion_interruptible(&xpt_cmd->xpt_passthrough_sem);
593
594 pr_debug("target_xcopy_issue_pt_cmd(): SCSI status: 0x%02x\n",
595 se_cmd->scsi_status);
596
597 return (se_cmd->scsi_status) ? -EINVAL : 0;
598 }
599
600 static int target_xcopy_read_source(
601 struct se_cmd *ec_cmd,
602 struct xcopy_op *xop,
603 struct se_device *src_dev,
604 sector_t src_lba,
605 u32 src_sectors)
606 {
607 struct xcopy_pt_cmd *xpt_cmd;
608 struct se_cmd *se_cmd;
609 u32 length = (src_sectors * src_dev->dev_attrib.block_size);
610 int rc;
611 unsigned char cdb[16];
612 bool remote_port = (xop->op_origin == XCOL_DEST_RECV_OP);
613
614 xpt_cmd = kzalloc(sizeof(struct xcopy_pt_cmd), GFP_KERNEL);
615 if (!xpt_cmd) {
616 pr_err("Unable to allocate xcopy_pt_cmd\n");
617 return -ENOMEM;
618 }
619 init_completion(&xpt_cmd->xpt_passthrough_sem);
620 se_cmd = &xpt_cmd->se_cmd;
621
622 memset(&cdb[0], 0, 16);
623 cdb[0] = READ_16;
624 put_unaligned_be64(src_lba, &cdb[2]);
625 put_unaligned_be32(src_sectors, &cdb[10]);
626 pr_debug("XCOPY: Built READ_16: LBA: %llu Sectors: %u Length: %u\n",
627 (unsigned long long)src_lba, src_sectors, length);
628
629 transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, &xcopy_pt_sess, length,
630 DMA_FROM_DEVICE, 0, &xpt_cmd->sense_buffer[0]);
631 xop->src_pt_cmd = xpt_cmd;
632
633 rc = target_xcopy_setup_pt_cmd(xpt_cmd, xop, src_dev, &cdb[0],
634 remote_port, true);
635 if (rc < 0) {
636 ec_cmd->scsi_status = xpt_cmd->se_cmd.scsi_status;
637 transport_generic_free_cmd(se_cmd, 0);
638 return rc;
639 }
640
641 xop->xop_data_sg = se_cmd->t_data_sg;
642 xop->xop_data_nents = se_cmd->t_data_nents;
643 pr_debug("XCOPY-READ: Saved xop->xop_data_sg: %p, num: %u for READ"
644 " memory\n", xop->xop_data_sg, xop->xop_data_nents);
645
646 rc = target_xcopy_issue_pt_cmd(xpt_cmd);
647 if (rc < 0) {
648 ec_cmd->scsi_status = xpt_cmd->se_cmd.scsi_status;
649 transport_generic_free_cmd(se_cmd, 0);
650 return rc;
651 }
652 /*
653 * Clear off the allocated t_data_sg, that has been saved for
654 * zero-copy WRITE submission reuse in struct xcopy_op..
655 */
656 se_cmd->t_data_sg = NULL;
657 se_cmd->t_data_nents = 0;
658
659 return 0;
660 }
661
662 static int target_xcopy_write_destination(
663 struct se_cmd *ec_cmd,
664 struct xcopy_op *xop,
665 struct se_device *dst_dev,
666 sector_t dst_lba,
667 u32 dst_sectors)
668 {
669 struct xcopy_pt_cmd *xpt_cmd;
670 struct se_cmd *se_cmd;
671 u32 length = (dst_sectors * dst_dev->dev_attrib.block_size);
672 int rc;
673 unsigned char cdb[16];
674 bool remote_port = (xop->op_origin == XCOL_SOURCE_RECV_OP);
675
676 xpt_cmd = kzalloc(sizeof(struct xcopy_pt_cmd), GFP_KERNEL);
677 if (!xpt_cmd) {
678 pr_err("Unable to allocate xcopy_pt_cmd\n");
679 return -ENOMEM;
680 }
681 init_completion(&xpt_cmd->xpt_passthrough_sem);
682 se_cmd = &xpt_cmd->se_cmd;
683
684 memset(&cdb[0], 0, 16);
685 cdb[0] = WRITE_16;
686 put_unaligned_be64(dst_lba, &cdb[2]);
687 put_unaligned_be32(dst_sectors, &cdb[10]);
688 pr_debug("XCOPY: Built WRITE_16: LBA: %llu Sectors: %u Length: %u\n",
689 (unsigned long long)dst_lba, dst_sectors, length);
690
691 transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, &xcopy_pt_sess, length,
692 DMA_TO_DEVICE, 0, &xpt_cmd->sense_buffer[0]);
693 xop->dst_pt_cmd = xpt_cmd;
694
695 rc = target_xcopy_setup_pt_cmd(xpt_cmd, xop, dst_dev, &cdb[0],
696 remote_port, false);
697 if (rc < 0) {
698 struct se_cmd *src_cmd = &xop->src_pt_cmd->se_cmd;
699 ec_cmd->scsi_status = xpt_cmd->se_cmd.scsi_status;
700 /*
701 * If the failure happened before the t_mem_list hand-off in
702 * target_xcopy_setup_pt_cmd(), Reset memory + clear flag so that
703 * core releases this memory on error during X-COPY WRITE I/O.
704 */
705 src_cmd->se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
706 src_cmd->t_data_sg = xop->xop_data_sg;
707 src_cmd->t_data_nents = xop->xop_data_nents;
708
709 transport_generic_free_cmd(se_cmd, 0);
710 return rc;
711 }
712
713 rc = target_xcopy_issue_pt_cmd(xpt_cmd);
714 if (rc < 0) {
715 ec_cmd->scsi_status = xpt_cmd->se_cmd.scsi_status;
716 se_cmd->se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
717 transport_generic_free_cmd(se_cmd, 0);
718 return rc;
719 }
720
721 return 0;
722 }
723
724 static void target_xcopy_do_work(struct work_struct *work)
725 {
726 struct xcopy_op *xop = container_of(work, struct xcopy_op, xop_work);
727 struct se_cmd *ec_cmd = xop->xop_se_cmd;
728 struct se_device *src_dev, *dst_dev;
729 sector_t src_lba, dst_lba, end_lba;
730 unsigned int max_sectors;
731 int rc = 0;
732 unsigned short nolb, cur_nolb, max_nolb, copied_nolb = 0;
733
734 if (target_parse_xcopy_cmd(xop) != TCM_NO_SENSE)
735 goto err_free;
736
737 if (WARN_ON_ONCE(!xop->src_dev) || WARN_ON_ONCE(!xop->dst_dev))
738 goto err_free;
739
740 src_dev = xop->src_dev;
741 dst_dev = xop->dst_dev;
742 src_lba = xop->src_lba;
743 dst_lba = xop->dst_lba;
744 nolb = xop->nolb;
745 end_lba = src_lba + nolb;
746 /*
747 * Break up XCOPY I/O into hw_max_sectors sized I/O based on the
748 * smallest max_sectors between src_dev + dev_dev, or
749 */
750 max_sectors = min(src_dev->dev_attrib.hw_max_sectors,
751 dst_dev->dev_attrib.hw_max_sectors);
752 max_sectors = min_t(u32, max_sectors, XCOPY_MAX_SECTORS);
753
754 max_nolb = min_t(u16, max_sectors, ((u16)(~0U)));
755
756 pr_debug("target_xcopy_do_work: nolb: %hu, max_nolb: %hu end_lba: %llu\n",
757 nolb, max_nolb, (unsigned long long)end_lba);
758 pr_debug("target_xcopy_do_work: Starting src_lba: %llu, dst_lba: %llu\n",
759 (unsigned long long)src_lba, (unsigned long long)dst_lba);
760
761 while (src_lba < end_lba) {
762 cur_nolb = min(nolb, max_nolb);
763
764 pr_debug("target_xcopy_do_work: Calling read src_dev: %p src_lba: %llu,"
765 " cur_nolb: %hu\n", src_dev, (unsigned long long)src_lba, cur_nolb);
766
767 rc = target_xcopy_read_source(ec_cmd, xop, src_dev, src_lba, cur_nolb);
768 if (rc < 0)
769 goto out;
770
771 src_lba += cur_nolb;
772 pr_debug("target_xcopy_do_work: Incremented READ src_lba to %llu\n",
773 (unsigned long long)src_lba);
774
775 pr_debug("target_xcopy_do_work: Calling write dst_dev: %p dst_lba: %llu,"
776 " cur_nolb: %hu\n", dst_dev, (unsigned long long)dst_lba, cur_nolb);
777
778 rc = target_xcopy_write_destination(ec_cmd, xop, dst_dev,
779 dst_lba, cur_nolb);
780 if (rc < 0) {
781 transport_generic_free_cmd(&xop->src_pt_cmd->se_cmd, 0);
782 goto out;
783 }
784
785 dst_lba += cur_nolb;
786 pr_debug("target_xcopy_do_work: Incremented WRITE dst_lba to %llu\n",
787 (unsigned long long)dst_lba);
788
789 copied_nolb += cur_nolb;
790 nolb -= cur_nolb;
791
792 transport_generic_free_cmd(&xop->src_pt_cmd->se_cmd, 0);
793 xop->dst_pt_cmd->se_cmd.se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
794
795 transport_generic_free_cmd(&xop->dst_pt_cmd->se_cmd, 0);
796 }
797
798 xcopy_pt_undepend_remotedev(xop);
799 kfree(xop);
800
801 pr_debug("target_xcopy_do_work: Final src_lba: %llu, dst_lba: %llu\n",
802 (unsigned long long)src_lba, (unsigned long long)dst_lba);
803 pr_debug("target_xcopy_do_work: Blocks copied: %hu, Bytes Copied: %u\n",
804 copied_nolb, copied_nolb * dst_dev->dev_attrib.block_size);
805
806 pr_debug("target_xcopy_do_work: Setting X-COPY GOOD status -> sending response\n");
807 target_complete_cmd(ec_cmd, SAM_STAT_GOOD);
808 return;
809
810 out:
811 xcopy_pt_undepend_remotedev(xop);
812
813 err_free:
814 kfree(xop);
815 /*
816 * Don't override an error scsi status if it has already been set
817 */
818 if (ec_cmd->scsi_status == SAM_STAT_GOOD) {
819 pr_warn_ratelimited("target_xcopy_do_work: rc: %d, Setting X-COPY"
820 " CHECK_CONDITION -> sending response\n", rc);
821 ec_cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
822 }
823 target_complete_cmd(ec_cmd, ec_cmd->scsi_status);
824 }
825
826 /*
827 * Returns TCM_NO_SENSE upon success or a sense code != TCM_NO_SENSE if parsing
828 * fails.
829 */
830 static sense_reason_t target_parse_xcopy_cmd(struct xcopy_op *xop)
831 {
832 struct se_cmd *se_cmd = xop->xop_se_cmd;
833 unsigned char *p = NULL, *seg_desc;
834 unsigned int list_id, list_id_usage, sdll, inline_dl;
835 sense_reason_t ret = TCM_INVALID_PARAMETER_LIST;
836 int rc;
837 unsigned short tdll;
838
839 p = transport_kmap_data_sg(se_cmd);
840 if (!p) {
841 pr_err("transport_kmap_data_sg() failed in target_do_xcopy\n");
842 return TCM_OUT_OF_RESOURCES;
843 }
844
845 list_id = p[0];
846 list_id_usage = (p[1] & 0x18) >> 3;
847
848 /*
849 * Determine TARGET DESCRIPTOR LIST LENGTH + SEGMENT DESCRIPTOR LIST LENGTH
850 */
851 tdll = get_unaligned_be16(&p[2]);
852 sdll = get_unaligned_be32(&p[8]);
853 if (tdll + sdll > RCR_OP_MAX_DESC_LIST_LEN) {
854 pr_err("XCOPY descriptor list length %u exceeds maximum %u\n",
855 tdll + sdll, RCR_OP_MAX_DESC_LIST_LEN);
856 ret = TCM_PARAMETER_LIST_LENGTH_ERROR;
857 goto out;
858 }
859
860 inline_dl = get_unaligned_be32(&p[12]);
861 if (inline_dl != 0) {
862 pr_err("XCOPY with non zero inline data length\n");
863 goto out;
864 }
865
866 if (se_cmd->data_length < (XCOPY_HDR_LEN + tdll + sdll + inline_dl)) {
867 pr_err("XCOPY parameter truncation: data length %u too small "
868 "for tdll: %hu sdll: %u inline_dl: %u\n",
869 se_cmd->data_length, tdll, sdll, inline_dl);
870 ret = TCM_PARAMETER_LIST_LENGTH_ERROR;
871 goto out;
872 }
873
874 pr_debug("Processing XCOPY with list_id: 0x%02x list_id_usage: 0x%02x"
875 " tdll: %hu sdll: %u inline_dl: %u\n", list_id, list_id_usage,
876 tdll, sdll, inline_dl);
877
878 /*
879 * skip over the target descriptors until segment descriptors
880 * have been passed - CSCD ids are needed to determine src and dest.
881 */
882 seg_desc = &p[16] + tdll;
883
884 rc = target_xcopy_parse_segment_descriptors(se_cmd, xop, seg_desc,
885 sdll, &ret);
886 if (rc <= 0)
887 goto out;
888
889 pr_debug("XCOPY: Processed %d segment descriptors, length: %u\n", rc,
890 rc * XCOPY_SEGMENT_DESC_LEN);
891
892 rc = target_xcopy_parse_target_descriptors(se_cmd, xop, &p[16], tdll, &ret);
893 if (rc <= 0)
894 goto out;
895
896 if (xop->src_dev->dev_attrib.block_size !=
897 xop->dst_dev->dev_attrib.block_size) {
898 pr_err("XCOPY: Non matching src_dev block_size: %u + dst_dev"
899 " block_size: %u currently unsupported\n",
900 xop->src_dev->dev_attrib.block_size,
901 xop->dst_dev->dev_attrib.block_size);
902 xcopy_pt_undepend_remotedev(xop);
903 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
904 goto out;
905 }
906
907 pr_debug("XCOPY: Processed %d target descriptors, length: %u\n", rc,
908 rc * XCOPY_TARGET_DESC_LEN);
909 transport_kunmap_data_sg(se_cmd);
910 return TCM_NO_SENSE;
911
912 out:
913 if (p)
914 transport_kunmap_data_sg(se_cmd);
915 return ret;
916 }
917
918 sense_reason_t target_do_xcopy(struct se_cmd *se_cmd)
919 {
920 struct se_device *dev = se_cmd->se_dev;
921 struct xcopy_op *xop;
922 unsigned int sa;
923
924 if (!dev->dev_attrib.emulate_3pc) {
925 pr_err("EXTENDED_COPY operation explicitly disabled\n");
926 return TCM_UNSUPPORTED_SCSI_OPCODE;
927 }
928
929 sa = se_cmd->t_task_cdb[1] & 0x1f;
930 if (sa != 0x00) {
931 pr_err("EXTENDED_COPY(LID4) not supported\n");
932 return TCM_UNSUPPORTED_SCSI_OPCODE;
933 }
934
935 if (se_cmd->data_length == 0) {
936 target_complete_cmd(se_cmd, SAM_STAT_GOOD);
937 return TCM_NO_SENSE;
938 }
939 if (se_cmd->data_length < XCOPY_HDR_LEN) {
940 pr_err("XCOPY parameter truncation: length %u < hdr_len %u\n",
941 se_cmd->data_length, XCOPY_HDR_LEN);
942 return TCM_PARAMETER_LIST_LENGTH_ERROR;
943 }
944
945 xop = kzalloc(sizeof(struct xcopy_op), GFP_KERNEL);
946 if (!xop)
947 goto err;
948 xop->xop_se_cmd = se_cmd;
949 INIT_WORK(&xop->xop_work, target_xcopy_do_work);
950 if (WARN_ON_ONCE(!queue_work(xcopy_wq, &xop->xop_work)))
951 goto free;
952 return TCM_NO_SENSE;
953
954 free:
955 kfree(xop);
956
957 err:
958 return TCM_OUT_OF_RESOURCES;
959 }
960
961 static sense_reason_t target_rcr_operating_parameters(struct se_cmd *se_cmd)
962 {
963 unsigned char *p;
964
965 p = transport_kmap_data_sg(se_cmd);
966 if (!p) {
967 pr_err("transport_kmap_data_sg failed in"
968 " target_rcr_operating_parameters\n");
969 return TCM_OUT_OF_RESOURCES;
970 }
971
972 if (se_cmd->data_length < 54) {
973 pr_err("Receive Copy Results Op Parameters length"
974 " too small: %u\n", se_cmd->data_length);
975 transport_kunmap_data_sg(se_cmd);
976 return TCM_INVALID_CDB_FIELD;
977 }
978 /*
979 * Set SNLID=1 (Supports no List ID)
980 */
981 p[4] = 0x1;
982 /*
983 * MAXIMUM TARGET DESCRIPTOR COUNT
984 */
985 put_unaligned_be16(RCR_OP_MAX_TARGET_DESC_COUNT, &p[8]);
986 /*
987 * MAXIMUM SEGMENT DESCRIPTOR COUNT
988 */
989 put_unaligned_be16(RCR_OP_MAX_SG_DESC_COUNT, &p[10]);
990 /*
991 * MAXIMUM DESCRIPTOR LIST LENGTH
992 */
993 put_unaligned_be32(RCR_OP_MAX_DESC_LIST_LEN, &p[12]);
994 /*
995 * MAXIMUM SEGMENT LENGTH
996 */
997 put_unaligned_be32(RCR_OP_MAX_SEGMENT_LEN, &p[16]);
998 /*
999 * MAXIMUM INLINE DATA LENGTH for SA 0x04 (NOT SUPPORTED)
1000 */
1001 put_unaligned_be32(0x0, &p[20]);
1002 /*
1003 * HELD DATA LIMIT
1004 */
1005 put_unaligned_be32(0x0, &p[24]);
1006 /*
1007 * MAXIMUM STREAM DEVICE TRANSFER SIZE
1008 */
1009 put_unaligned_be32(0x0, &p[28]);
1010 /*
1011 * TOTAL CONCURRENT COPIES
1012 */
1013 put_unaligned_be16(RCR_OP_TOTAL_CONCURR_COPIES, &p[34]);
1014 /*
1015 * MAXIMUM CONCURRENT COPIES
1016 */
1017 p[36] = RCR_OP_MAX_CONCURR_COPIES;
1018 /*
1019 * DATA SEGMENT GRANULARITY (log 2)
1020 */
1021 p[37] = RCR_OP_DATA_SEG_GRAN_LOG2;
1022 /*
1023 * INLINE DATA GRANULARITY log 2)
1024 */
1025 p[38] = RCR_OP_INLINE_DATA_GRAN_LOG2;
1026 /*
1027 * HELD DATA GRANULARITY
1028 */
1029 p[39] = RCR_OP_HELD_DATA_GRAN_LOG2;
1030 /*
1031 * IMPLEMENTED DESCRIPTOR LIST LENGTH
1032 */
1033 p[43] = 0x2;
1034 /*
1035 * List of implemented descriptor type codes (ordered)
1036 */
1037 p[44] = 0x02; /* Copy Block to Block device */
1038 p[45] = 0xe4; /* Identification descriptor target descriptor */
1039
1040 /*
1041 * AVAILABLE DATA (n-3)
1042 */
1043 put_unaligned_be32(42, &p[0]);
1044
1045 transport_kunmap_data_sg(se_cmd);
1046 target_complete_cmd(se_cmd, GOOD);
1047
1048 return TCM_NO_SENSE;
1049 }
1050
1051 sense_reason_t target_do_receive_copy_results(struct se_cmd *se_cmd)
1052 {
1053 unsigned char *cdb = &se_cmd->t_task_cdb[0];
1054 int sa = (cdb[1] & 0x1f), list_id = cdb[2];
1055 sense_reason_t rc = TCM_NO_SENSE;
1056
1057 pr_debug("Entering target_do_receive_copy_results: SA: 0x%02x, List ID:"
1058 " 0x%02x, AL: %u\n", sa, list_id, se_cmd->data_length);
1059
1060 if (list_id != 0) {
1061 pr_err("Receive Copy Results with non zero list identifier"
1062 " not supported\n");
1063 return TCM_INVALID_CDB_FIELD;
1064 }
1065
1066 switch (sa) {
1067 case RCR_SA_OPERATING_PARAMETERS:
1068 rc = target_rcr_operating_parameters(se_cmd);
1069 break;
1070 case RCR_SA_COPY_STATUS:
1071 case RCR_SA_RECEIVE_DATA:
1072 case RCR_SA_FAILED_SEGMENT_DETAILS:
1073 default:
1074 pr_err("Unsupported SA for receive copy results: 0x%02x\n", sa);
1075 return TCM_INVALID_CDB_FIELD;
1076 }
1077
1078 return rc;
1079 }
Linux with added FPC-III support