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