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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 <[email protected]>
12 *
13 ******************************************************************************/
14
15#include <linux/slab.h>
16#include <linux/spinlock.h>
17#include <linux/list.h>
18#include <linux/rculist.h>
19#include <linux/configfs.h>
20#include <linux/ratelimit.h>
21#include <scsi/scsi_proto.h>
22#include <linux/unaligned.h>
23
24#include <target/target_core_base.h>
25#include <target/target_core_backend.h>
26#include <target/target_core_fabric.h>
27
28#include "target_core_internal.h"
29#include "target_core_pr.h"
30#include "target_core_ua.h"
31#include "target_core_xcopy.h"
32
33static struct workqueue_struct *xcopy_wq = NULL;
34
35static sense_reason_t target_parse_xcopy_cmd(struct xcopy_op *xop);
36
37/**
38 * target_xcopy_locate_se_dev_e4_iter - compare XCOPY NAA device identifiers
39 *
40 * @se_dev: device being considered for match
41 * @dev_wwn: XCOPY requested NAA dev_wwn
42 * @return: 1 on match, 0 on no-match
43 */
44static int target_xcopy_locate_se_dev_e4_iter(struct se_device *se_dev,
45 const unsigned char *dev_wwn)
46{
47 unsigned char tmp_dev_wwn[XCOPY_NAA_IEEE_REGEX_LEN];
48 int rc;
49
50 if (!se_dev->dev_attrib.emulate_3pc) {
51 pr_debug("XCOPY: emulate_3pc disabled on se_dev %p\n", se_dev);
52 return 0;
53 }
54
55 memset(&tmp_dev_wwn[0], 0, XCOPY_NAA_IEEE_REGEX_LEN);
56 spc_gen_naa_6h_vendor_specific(se_dev, &tmp_dev_wwn[0]);
57
58 rc = memcmp(&tmp_dev_wwn[0], dev_wwn, XCOPY_NAA_IEEE_REGEX_LEN);
59 if (rc != 0) {
60 pr_debug("XCOPY: skip non-matching: %*ph\n",
61 XCOPY_NAA_IEEE_REGEX_LEN, tmp_dev_wwn);
62 return 0;
63 }
64 pr_debug("XCOPY 0xe4: located se_dev: %p\n", se_dev);
65
66 return 1;
67}
68
69static int target_xcopy_locate_se_dev_e4(struct se_session *sess,
70 const unsigned char *dev_wwn,
71 struct se_device **_found_dev,
72 struct percpu_ref **_found_lun_ref)
73{
74 struct se_dev_entry *deve;
75 struct se_node_acl *nacl;
76 struct se_lun *this_lun = NULL;
77 struct se_device *found_dev = NULL;
78
79 /* cmd with NULL sess indicates no associated $FABRIC_MOD */
80 if (!sess)
81 goto err_out;
82
83 pr_debug("XCOPY 0xe4: searching for: %*ph\n",
84 XCOPY_NAA_IEEE_REGEX_LEN, dev_wwn);
85
86 nacl = sess->se_node_acl;
87 rcu_read_lock();
88 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
89 struct se_device *this_dev;
90 int rc;
91
92 this_lun = deve->se_lun;
93 this_dev = rcu_dereference_raw(this_lun->lun_se_dev);
94
95 rc = target_xcopy_locate_se_dev_e4_iter(this_dev, dev_wwn);
96 if (rc) {
97 if (percpu_ref_tryget_live(&this_lun->lun_ref))
98 found_dev = this_dev;
99 break;
100 }
101 }
102 rcu_read_unlock();
103 if (found_dev == NULL)
104 goto err_out;
105
106 pr_debug("lun_ref held for se_dev: %p se_dev->se_dev_group: %p\n",
107 found_dev, &found_dev->dev_group);
108 *_found_dev = found_dev;
109 *_found_lun_ref = &this_lun->lun_ref;
110 return 0;
111err_out:
112 pr_debug_ratelimited("Unable to locate 0xe4 descriptor for EXTENDED_COPY\n");
113 return -EINVAL;
114}
115
116static int target_xcopy_parse_tiddesc_e4(struct se_cmd *se_cmd, struct xcopy_op *xop,
117 unsigned char *p, unsigned short cscd_index)
118{
119 unsigned char *desc = p;
120 unsigned short ript;
121 u8 desig_len;
122 /*
123 * Extract RELATIVE INITIATOR PORT IDENTIFIER
124 */
125 ript = get_unaligned_be16(&desc[2]);
126 pr_debug("XCOPY 0xe4: RELATIVE INITIATOR PORT IDENTIFIER: %hu\n", ript);
127 /*
128 * Check for supported code set, association, and designator type
129 */
130 if ((desc[4] & 0x0f) != 0x1) {
131 pr_err("XCOPY 0xe4: code set of non binary type not supported\n");
132 return -EINVAL;
133 }
134 if ((desc[5] & 0x30) != 0x00) {
135 pr_err("XCOPY 0xe4: association other than LUN not supported\n");
136 return -EINVAL;
137 }
138 if ((desc[5] & 0x0f) != 0x3) {
139 pr_err("XCOPY 0xe4: designator type unsupported: 0x%02x\n",
140 (desc[5] & 0x0f));
141 return -EINVAL;
142 }
143 /*
144 * Check for matching 16 byte length for NAA IEEE Registered Extended
145 * Assigned designator
146 */
147 desig_len = desc[7];
148 if (desig_len != XCOPY_NAA_IEEE_REGEX_LEN) {
149 pr_err("XCOPY 0xe4: invalid desig_len: %d\n", (int)desig_len);
150 return -EINVAL;
151 }
152 pr_debug("XCOPY 0xe4: desig_len: %d\n", (int)desig_len);
153 /*
154 * Check for NAA IEEE Registered Extended Assigned header..
155 */
156 if ((desc[8] & 0xf0) != 0x60) {
157 pr_err("XCOPY 0xe4: Unsupported DESIGNATOR TYPE: 0x%02x\n",
158 (desc[8] & 0xf0));
159 return -EINVAL;
160 }
161
162 if (cscd_index != xop->stdi && cscd_index != xop->dtdi) {
163 pr_debug("XCOPY 0xe4: ignoring CSCD entry %d - neither src nor "
164 "dest\n", cscd_index);
165 return 0;
166 }
167
168 if (cscd_index == xop->stdi) {
169 memcpy(&xop->src_tid_wwn[0], &desc[8], XCOPY_NAA_IEEE_REGEX_LEN);
170 /*
171 * Determine if the source designator matches the local device
172 */
173 if (!memcmp(&xop->local_dev_wwn[0], &xop->src_tid_wwn[0],
174 XCOPY_NAA_IEEE_REGEX_LEN)) {
175 xop->op_origin = XCOL_SOURCE_RECV_OP;
176 xop->src_dev = se_cmd->se_dev;
177 pr_debug("XCOPY 0xe4: Set xop->src_dev %p from source"
178 " received xop\n", xop->src_dev);
179 }
180 }
181
182 if (cscd_index == xop->dtdi) {
183 memcpy(&xop->dst_tid_wwn[0], &desc[8], XCOPY_NAA_IEEE_REGEX_LEN);
184 /*
185 * Determine if the destination designator matches the local
186 * device. If @cscd_index corresponds to both source (stdi) and
187 * destination (dtdi), or dtdi comes after stdi, then
188 * XCOL_DEST_RECV_OP wins.
189 */
190 if (!memcmp(&xop->local_dev_wwn[0], &xop->dst_tid_wwn[0],
191 XCOPY_NAA_IEEE_REGEX_LEN)) {
192 xop->op_origin = XCOL_DEST_RECV_OP;
193 xop->dst_dev = se_cmd->se_dev;
194 pr_debug("XCOPY 0xe4: Set xop->dst_dev: %p from destination"
195 " received xop\n", xop->dst_dev);
196 }
197 }
198
199 return 0;
200}
201
202static int target_xcopy_parse_target_descriptors(struct se_cmd *se_cmd,
203 struct xcopy_op *xop, unsigned char *p,
204 unsigned short tdll, sense_reason_t *sense_ret)
205{
206 struct se_device *local_dev = se_cmd->se_dev;
207 unsigned char *desc = p;
208 int offset = tdll % XCOPY_TARGET_DESC_LEN, rc;
209 unsigned short cscd_index = 0;
210 unsigned short start = 0;
211
212 *sense_ret = TCM_INVALID_PARAMETER_LIST;
213
214 if (offset != 0) {
215 pr_err("XCOPY target descriptor list length is not"
216 " multiple of %d\n", XCOPY_TARGET_DESC_LEN);
217 *sense_ret = TCM_UNSUPPORTED_TARGET_DESC_TYPE_CODE;
218 return -EINVAL;
219 }
220 if (tdll > RCR_OP_MAX_TARGET_DESC_COUNT * XCOPY_TARGET_DESC_LEN) {
221 pr_err("XCOPY target descriptor supports a maximum"
222 " two src/dest descriptors, tdll: %hu too large..\n", tdll);
223 /* spc4r37 6.4.3.4 CSCD DESCRIPTOR LIST LENGTH field */
224 *sense_ret = TCM_TOO_MANY_TARGET_DESCS;
225 return -EINVAL;
226 }
227 /*
228 * Generate an IEEE Registered Extended designator based upon the
229 * se_device the XCOPY was received upon..
230 */
231 memset(&xop->local_dev_wwn[0], 0, XCOPY_NAA_IEEE_REGEX_LEN);
232 spc_gen_naa_6h_vendor_specific(local_dev, &xop->local_dev_wwn[0]);
233
234 while (start < tdll) {
235 /*
236 * Check target descriptor identification with 0xE4 type, and
237 * compare the current index with the CSCD descriptor IDs in
238 * the segment descriptor. Use VPD 0x83 WWPN matching ..
239 */
240 switch (desc[0]) {
241 case 0xe4:
242 rc = target_xcopy_parse_tiddesc_e4(se_cmd, xop,
243 &desc[0], cscd_index);
244 if (rc != 0)
245 goto out;
246 start += XCOPY_TARGET_DESC_LEN;
247 desc += XCOPY_TARGET_DESC_LEN;
248 cscd_index++;
249 break;
250 default:
251 pr_err("XCOPY unsupported descriptor type code:"
252 " 0x%02x\n", desc[0]);
253 *sense_ret = TCM_UNSUPPORTED_TARGET_DESC_TYPE_CODE;
254 goto out;
255 }
256 }
257
258 switch (xop->op_origin) {
259 case XCOL_SOURCE_RECV_OP:
260 rc = target_xcopy_locate_se_dev_e4(se_cmd->se_sess,
261 xop->dst_tid_wwn,
262 &xop->dst_dev,
263 &xop->remote_lun_ref);
264 break;
265 case XCOL_DEST_RECV_OP:
266 rc = target_xcopy_locate_se_dev_e4(se_cmd->se_sess,
267 xop->src_tid_wwn,
268 &xop->src_dev,
269 &xop->remote_lun_ref);
270 break;
271 default:
272 pr_err("XCOPY CSCD descriptor IDs not found in CSCD list - "
273 "stdi: %hu dtdi: %hu\n", xop->stdi, xop->dtdi);
274 rc = -EINVAL;
275 break;
276 }
277 /*
278 * If a matching IEEE NAA 0x83 descriptor for the requested device
279 * is not located on this node, return COPY_ABORTED with ASQ/ASQC
280 * 0x0d/0x02 - COPY_TARGET_DEVICE_NOT_REACHABLE to request the
281 * initiator to fall back to normal copy method.
282 */
283 if (rc < 0) {
284 *sense_ret = TCM_COPY_TARGET_DEVICE_NOT_REACHABLE;
285 goto out;
286 }
287
288 pr_debug("XCOPY TGT desc: Source dev: %p NAA IEEE WWN: 0x%16phN\n",
289 xop->src_dev, &xop->src_tid_wwn[0]);
290 pr_debug("XCOPY TGT desc: Dest dev: %p NAA IEEE WWN: 0x%16phN\n",
291 xop->dst_dev, &xop->dst_tid_wwn[0]);
292
293 return cscd_index;
294
295out:
296 return -EINVAL;
297}
298
299static int target_xcopy_parse_segdesc_02(struct xcopy_op *xop, unsigned char *p)
300{
301 unsigned char *desc = p;
302 int dc = (desc[1] & 0x02);
303 unsigned short desc_len;
304
305 desc_len = get_unaligned_be16(&desc[2]);
306 if (desc_len != 0x18) {
307 pr_err("XCOPY segment desc 0x02: Illegal desc_len:"
308 " %hu\n", desc_len);
309 return -EINVAL;
310 }
311
312 xop->stdi = get_unaligned_be16(&desc[4]);
313 xop->dtdi = get_unaligned_be16(&desc[6]);
314
315 if (xop->stdi > XCOPY_CSCD_DESC_ID_LIST_OFF_MAX ||
316 xop->dtdi > XCOPY_CSCD_DESC_ID_LIST_OFF_MAX) {
317 pr_err("XCOPY segment desc 0x02: unsupported CSCD ID > 0x%x; stdi: %hu dtdi: %hu\n",
318 XCOPY_CSCD_DESC_ID_LIST_OFF_MAX, xop->stdi, xop->dtdi);
319 return -EINVAL;
320 }
321
322 pr_debug("XCOPY seg desc 0x02: desc_len: %hu stdi: %hu dtdi: %hu, DC: %d\n",
323 desc_len, xop->stdi, xop->dtdi, dc);
324
325 xop->nolb = get_unaligned_be16(&desc[10]);
326 xop->src_lba = get_unaligned_be64(&desc[12]);
327 xop->dst_lba = get_unaligned_be64(&desc[20]);
328 pr_debug("XCOPY seg desc 0x02: nolb: %hu src_lba: %llu dst_lba: %llu\n",
329 xop->nolb, (unsigned long long)xop->src_lba,
330 (unsigned long long)xop->dst_lba);
331
332 return 0;
333}
334
335static int target_xcopy_parse_segment_descriptors(struct xcopy_op *xop,
336 unsigned char *p, unsigned int sdll,
337 sense_reason_t *sense_ret)
338{
339 unsigned char *desc = p;
340 unsigned int start = 0;
341 int offset = sdll % XCOPY_SEGMENT_DESC_LEN, rc, ret = 0;
342
343 *sense_ret = TCM_INVALID_PARAMETER_LIST;
344
345 if (offset != 0) {
346 pr_err("XCOPY segment descriptor list length is not"
347 " multiple of %d\n", XCOPY_SEGMENT_DESC_LEN);
348 *sense_ret = TCM_UNSUPPORTED_SEGMENT_DESC_TYPE_CODE;
349 return -EINVAL;
350 }
351 if (sdll > RCR_OP_MAX_SG_DESC_COUNT * XCOPY_SEGMENT_DESC_LEN) {
352 pr_err("XCOPY supports %u segment descriptor(s), sdll: %u too"
353 " large..\n", RCR_OP_MAX_SG_DESC_COUNT, sdll);
354 /* spc4r37 6.4.3.5 SEGMENT DESCRIPTOR LIST LENGTH field */
355 *sense_ret = TCM_TOO_MANY_SEGMENT_DESCS;
356 return -EINVAL;
357 }
358
359 while (start < sdll) {
360 /*
361 * Check segment descriptor type code for block -> block
362 */
363 switch (desc[0]) {
364 case 0x02:
365 rc = target_xcopy_parse_segdesc_02(xop, desc);
366 if (rc < 0)
367 goto out;
368
369 ret++;
370 start += XCOPY_SEGMENT_DESC_LEN;
371 desc += XCOPY_SEGMENT_DESC_LEN;
372 break;
373 default:
374 pr_err("XCOPY unsupported segment descriptor"
375 "type: 0x%02x\n", desc[0]);
376 *sense_ret = TCM_UNSUPPORTED_SEGMENT_DESC_TYPE_CODE;
377 goto out;
378 }
379 }
380
381 return ret;
382
383out:
384 return -EINVAL;
385}
386
387/*
388 * Start xcopy_pt ops
389 */
390
391struct xcopy_pt_cmd {
392 struct se_cmd se_cmd;
393 struct completion xpt_passthrough_sem;
394 unsigned char sense_buffer[TRANSPORT_SENSE_BUFFER];
395};
396
397struct se_portal_group xcopy_pt_tpg;
398static struct se_session xcopy_pt_sess;
399static struct se_node_acl xcopy_pt_nacl;
400
401static int xcopy_pt_get_cmd_state(struct se_cmd *se_cmd)
402{
403 return 0;
404}
405
406static void xcopy_pt_undepend_remotedev(struct xcopy_op *xop)
407{
408 if (xop->op_origin == XCOL_SOURCE_RECV_OP)
409 pr_debug("putting dst lun_ref for %p\n", xop->dst_dev);
410 else
411 pr_debug("putting src lun_ref for %p\n", xop->src_dev);
412
413 percpu_ref_put(xop->remote_lun_ref);
414}
415
416static void xcopy_pt_release_cmd(struct se_cmd *se_cmd)
417{
418 struct xcopy_pt_cmd *xpt_cmd = container_of(se_cmd,
419 struct xcopy_pt_cmd, se_cmd);
420
421 /* xpt_cmd is on the stack, nothing to free here */
422 pr_debug("xpt_cmd done: %p\n", 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_queue_data_in(struct se_cmd *se_cmd)
440{
441 return 0;
442}
443
444static int xcopy_pt_queue_status(struct se_cmd *se_cmd)
445{
446 return 0;
447}
448
449static const struct target_core_fabric_ops xcopy_pt_tfo = {
450 .fabric_name = "xcopy-pt",
451 .get_cmd_state = xcopy_pt_get_cmd_state,
452 .release_cmd = xcopy_pt_release_cmd,
453 .check_stop_free = xcopy_pt_check_stop_free,
454 .write_pending = xcopy_pt_write_pending,
455 .queue_data_in = xcopy_pt_queue_data_in,
456 .queue_status = xcopy_pt_queue_status,
457};
458
459/*
460 * End xcopy_pt_ops
461 */
462
463int target_xcopy_setup_pt(void)
464{
465 xcopy_wq = alloc_workqueue("xcopy_wq", WQ_MEM_RECLAIM | WQ_PERCPU, 0);
466 if (!xcopy_wq) {
467 pr_err("Unable to allocate xcopy_wq\n");
468 return -ENOMEM;
469 }
470
471 memset(&xcopy_pt_tpg, 0, sizeof(struct se_portal_group));
472 INIT_LIST_HEAD(&xcopy_pt_tpg.acl_node_list);
473 INIT_LIST_HEAD(&xcopy_pt_tpg.tpg_sess_list);
474
475 xcopy_pt_tpg.se_tpg_tfo = &xcopy_pt_tfo;
476
477 memset(&xcopy_pt_nacl, 0, sizeof(struct se_node_acl));
478 INIT_LIST_HEAD(&xcopy_pt_nacl.acl_list);
479 INIT_LIST_HEAD(&xcopy_pt_nacl.acl_sess_list);
480 memset(&xcopy_pt_sess, 0, sizeof(struct se_session));
481 transport_init_session(&xcopy_pt_sess);
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
492void 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 *
508 * Set up a SCSI command (READ or WRITE) that will be used to execute an
509 * XCOPY command.
510 */
511static int target_xcopy_setup_pt_cmd(
512 struct xcopy_pt_cmd *xpt_cmd,
513 struct xcopy_op *xop,
514 struct se_device *se_dev,
515 unsigned char *cdb,
516 bool remote_port)
517{
518 struct se_cmd *cmd = &xpt_cmd->se_cmd;
519
520 /*
521 * Setup LUN+port to honor reservations based upon xop->op_origin for
522 * X-COPY PUSH or X-COPY PULL based upon where the CDB was received.
523 */
524 if (remote_port) {
525 cmd->se_lun = &se_dev->xcopy_lun;
526 cmd->se_dev = se_dev;
527 } else {
528 cmd->se_lun = xop->xop_se_cmd->se_lun;
529 cmd->se_dev = xop->xop_se_cmd->se_dev;
530 }
531 cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
532
533 if (target_cmd_init_cdb(cmd, cdb, GFP_KERNEL))
534 return -EINVAL;
535
536 cmd->tag = 0;
537 if (target_cmd_parse_cdb(cmd))
538 return -EINVAL;
539
540 if (transport_generic_map_mem_to_cmd(cmd, xop->xop_data_sg,
541 xop->xop_data_nents, NULL, 0))
542 return -EINVAL;
543
544 pr_debug("Setup PASSTHROUGH_NOALLOC t_data_sg: %p t_data_nents:"
545 " %u\n", cmd->t_data_sg, cmd->t_data_nents);
546
547 return 0;
548}
549
550static int target_xcopy_issue_pt_cmd(struct xcopy_pt_cmd *xpt_cmd)
551{
552 struct se_cmd *se_cmd = &xpt_cmd->se_cmd;
553 sense_reason_t sense_rc;
554
555 sense_rc = transport_generic_new_cmd(se_cmd);
556 if (sense_rc)
557 return -EINVAL;
558
559 if (se_cmd->data_direction == DMA_TO_DEVICE)
560 target_execute_cmd(se_cmd);
561
562 wait_for_completion_interruptible(&xpt_cmd->xpt_passthrough_sem);
563
564 pr_debug("target_xcopy_issue_pt_cmd(): SCSI status: 0x%02x\n",
565 se_cmd->scsi_status);
566
567 return (se_cmd->scsi_status) ? -EINVAL : 0;
568}
569
570static int target_xcopy_read_source(
571 struct se_cmd *ec_cmd,
572 struct xcopy_op *xop,
573 struct se_device *src_dev,
574 sector_t src_lba,
575 u32 src_bytes)
576{
577 struct xcopy_pt_cmd xpt_cmd;
578 struct se_cmd *se_cmd = &xpt_cmd.se_cmd;
579 u32 transfer_length_block = src_bytes / src_dev->dev_attrib.block_size;
580 int rc;
581 unsigned char cdb[16];
582 bool remote_port = (xop->op_origin == XCOL_DEST_RECV_OP);
583
584 memset(&xpt_cmd, 0, sizeof(xpt_cmd));
585 init_completion(&xpt_cmd.xpt_passthrough_sem);
586
587 memset(&cdb[0], 0, 16);
588 cdb[0] = READ_16;
589 put_unaligned_be64(src_lba, &cdb[2]);
590 put_unaligned_be32(transfer_length_block, &cdb[10]);
591 pr_debug("XCOPY: Built READ_16: LBA: %llu Blocks: %u Length: %u\n",
592 (unsigned long long)src_lba, transfer_length_block, src_bytes);
593
594 __target_init_cmd(se_cmd, &xcopy_pt_tfo, &xcopy_pt_sess, src_bytes,
595 DMA_FROM_DEVICE, 0, &xpt_cmd.sense_buffer[0], 0,
596 NULL);
597 rc = target_xcopy_setup_pt_cmd(&xpt_cmd, xop, src_dev, &cdb[0],
598 remote_port);
599 if (rc < 0) {
600 ec_cmd->scsi_status = se_cmd->scsi_status;
601 goto out;
602 }
603
604 pr_debug("XCOPY-READ: Saved xop->xop_data_sg: %p, num: %u for READ"
605 " memory\n", xop->xop_data_sg, xop->xop_data_nents);
606
607 rc = target_xcopy_issue_pt_cmd(&xpt_cmd);
608 if (rc < 0)
609 ec_cmd->scsi_status = se_cmd->scsi_status;
610out:
611 transport_generic_free_cmd(se_cmd, 0);
612 return rc;
613}
614
615static int target_xcopy_write_destination(
616 struct se_cmd *ec_cmd,
617 struct xcopy_op *xop,
618 struct se_device *dst_dev,
619 sector_t dst_lba,
620 u32 dst_bytes)
621{
622 struct xcopy_pt_cmd xpt_cmd;
623 struct se_cmd *se_cmd = &xpt_cmd.se_cmd;
624 u32 transfer_length_block = dst_bytes / dst_dev->dev_attrib.block_size;
625 int rc;
626 unsigned char cdb[16];
627 bool remote_port = (xop->op_origin == XCOL_SOURCE_RECV_OP);
628
629 memset(&xpt_cmd, 0, sizeof(xpt_cmd));
630 init_completion(&xpt_cmd.xpt_passthrough_sem);
631
632 memset(&cdb[0], 0, 16);
633 cdb[0] = WRITE_16;
634 put_unaligned_be64(dst_lba, &cdb[2]);
635 put_unaligned_be32(transfer_length_block, &cdb[10]);
636 pr_debug("XCOPY: Built WRITE_16: LBA: %llu Blocks: %u Length: %u\n",
637 (unsigned long long)dst_lba, transfer_length_block, dst_bytes);
638
639 __target_init_cmd(se_cmd, &xcopy_pt_tfo, &xcopy_pt_sess, dst_bytes,
640 DMA_TO_DEVICE, 0, &xpt_cmd.sense_buffer[0], 0,
641 NULL);
642 rc = target_xcopy_setup_pt_cmd(&xpt_cmd, xop, dst_dev, &cdb[0],
643 remote_port);
644 if (rc < 0) {
645 ec_cmd->scsi_status = se_cmd->scsi_status;
646 goto out;
647 }
648
649 rc = target_xcopy_issue_pt_cmd(&xpt_cmd);
650 if (rc < 0)
651 ec_cmd->scsi_status = se_cmd->scsi_status;
652out:
653 transport_generic_free_cmd(se_cmd, 0);
654 return rc;
655}
656
657static void target_xcopy_do_work(struct work_struct *work)
658{
659 struct xcopy_op *xop = container_of(work, struct xcopy_op, xop_work);
660 struct se_cmd *ec_cmd = xop->xop_se_cmd;
661 struct se_device *src_dev, *dst_dev;
662 sector_t src_lba, dst_lba, end_lba;
663 unsigned long long max_bytes, max_bytes_src, max_bytes_dst, max_blocks;
664 int rc = 0;
665 unsigned short nolb;
666 unsigned int copied_bytes = 0;
667 sense_reason_t sense_rc;
668
669 sense_rc = target_parse_xcopy_cmd(xop);
670 if (sense_rc != TCM_NO_SENSE)
671 goto err_free;
672
673 if (WARN_ON_ONCE(!xop->src_dev) || WARN_ON_ONCE(!xop->dst_dev)) {
674 sense_rc = TCM_INVALID_PARAMETER_LIST;
675 goto err_free;
676 }
677
678 src_dev = xop->src_dev;
679 dst_dev = xop->dst_dev;
680 src_lba = xop->src_lba;
681 dst_lba = xop->dst_lba;
682 nolb = xop->nolb;
683 end_lba = src_lba + nolb;
684 /*
685 * Break up XCOPY I/O into hw_max_sectors * hw_block_size sized
686 * I/O based on the smallest max_bytes between src_dev + dst_dev
687 */
688 max_bytes_src = (unsigned long long) src_dev->dev_attrib.hw_max_sectors *
689 src_dev->dev_attrib.hw_block_size;
690 max_bytes_dst = (unsigned long long) dst_dev->dev_attrib.hw_max_sectors *
691 dst_dev->dev_attrib.hw_block_size;
692
693 max_bytes = min_t(u64, max_bytes_src, max_bytes_dst);
694 max_bytes = min_t(u64, max_bytes, XCOPY_MAX_BYTES);
695
696 /*
697 * Using shift instead of the division because otherwise GCC
698 * generates __udivdi3 that is missing on i386
699 */
700 max_blocks = max_bytes >> ilog2(src_dev->dev_attrib.block_size);
701
702 pr_debug("%s: nolb: %u, max_blocks: %llu end_lba: %llu\n", __func__,
703 nolb, max_blocks, (unsigned long long)end_lba);
704 pr_debug("%s: Starting src_lba: %llu, dst_lba: %llu\n", __func__,
705 (unsigned long long)src_lba, (unsigned long long)dst_lba);
706
707 while (nolb) {
708 u32 cur_bytes = min_t(u64, max_bytes, nolb * src_dev->dev_attrib.block_size);
709 unsigned short cur_nolb = cur_bytes / src_dev->dev_attrib.block_size;
710
711 if (cur_bytes != xop->xop_data_bytes) {
712 /*
713 * (Re)allocate a buffer large enough to hold the XCOPY
714 * I/O size, which can be reused each read / write loop.
715 */
716 target_free_sgl(xop->xop_data_sg, xop->xop_data_nents);
717 rc = target_alloc_sgl(&xop->xop_data_sg,
718 &xop->xop_data_nents,
719 cur_bytes,
720 false, false);
721 if (rc < 0)
722 goto out;
723 xop->xop_data_bytes = cur_bytes;
724 }
725
726 pr_debug("%s: Calling read src_dev: %p src_lba: %llu, cur_nolb: %hu\n",
727 __func__, src_dev, (unsigned long long)src_lba, cur_nolb);
728
729 rc = target_xcopy_read_source(ec_cmd, xop, src_dev, src_lba, cur_bytes);
730 if (rc < 0)
731 goto out;
732
733 src_lba += cur_bytes / src_dev->dev_attrib.block_size;
734 pr_debug("%s: Incremented READ src_lba to %llu\n", __func__,
735 (unsigned long long)src_lba);
736
737 pr_debug("%s: Calling write dst_dev: %p dst_lba: %llu, cur_nolb: %u\n",
738 __func__, dst_dev, (unsigned long long)dst_lba, cur_nolb);
739
740 rc = target_xcopy_write_destination(ec_cmd, xop, dst_dev,
741 dst_lba, cur_bytes);
742 if (rc < 0)
743 goto out;
744
745 dst_lba += cur_bytes / dst_dev->dev_attrib.block_size;
746 pr_debug("%s: Incremented WRITE dst_lba to %llu\n", __func__,
747 (unsigned long long)dst_lba);
748
749 copied_bytes += cur_bytes;
750 nolb -= cur_bytes / src_dev->dev_attrib.block_size;
751 }
752
753 xcopy_pt_undepend_remotedev(xop);
754 target_free_sgl(xop->xop_data_sg, xop->xop_data_nents);
755 kfree(xop);
756
757 pr_debug("%s: Final src_lba: %llu, dst_lba: %llu\n", __func__,
758 (unsigned long long)src_lba, (unsigned long long)dst_lba);
759 pr_debug("%s: Blocks copied: %u, Bytes Copied: %u\n", __func__,
760 copied_bytes / dst_dev->dev_attrib.block_size, copied_bytes);
761
762 pr_debug("%s: Setting X-COPY GOOD status -> sending response\n", __func__);
763 target_complete_cmd(ec_cmd, SAM_STAT_GOOD);
764 return;
765
766out:
767 /*
768 * The XCOPY command was aborted after some data was transferred.
769 * Terminate command with CHECK CONDITION status, with the sense key
770 * set to COPY ABORTED.
771 */
772 sense_rc = TCM_COPY_TARGET_DEVICE_NOT_REACHABLE;
773 xcopy_pt_undepend_remotedev(xop);
774 target_free_sgl(xop->xop_data_sg, xop->xop_data_nents);
775
776err_free:
777 kfree(xop);
778 pr_warn_ratelimited("%s: rc: %d, sense: %u, XCOPY operation failed\n",
779 __func__, rc, sense_rc);
780 target_complete_cmd_with_sense(ec_cmd, SAM_STAT_CHECK_CONDITION, sense_rc);
781}
782
783/*
784 * Returns TCM_NO_SENSE upon success or a sense code != TCM_NO_SENSE if parsing
785 * fails.
786 */
787static sense_reason_t target_parse_xcopy_cmd(struct xcopy_op *xop)
788{
789 struct se_cmd *se_cmd = xop->xop_se_cmd;
790 unsigned char *p = NULL, *seg_desc;
791 unsigned int list_id, list_id_usage, sdll, inline_dl;
792 sense_reason_t ret = TCM_INVALID_PARAMETER_LIST;
793 int rc;
794 unsigned short tdll;
795
796 p = transport_kmap_data_sg(se_cmd);
797 if (!p) {
798 pr_err("transport_kmap_data_sg() failed in target_do_xcopy\n");
799 return TCM_OUT_OF_RESOURCES;
800 }
801
802 list_id = p[0];
803 list_id_usage = (p[1] & 0x18) >> 3;
804
805 /*
806 * Determine TARGET DESCRIPTOR LIST LENGTH + SEGMENT DESCRIPTOR LIST LENGTH
807 */
808 tdll = get_unaligned_be16(&p[2]);
809 sdll = get_unaligned_be32(&p[8]);
810 if (tdll + sdll > RCR_OP_MAX_DESC_LIST_LEN) {
811 pr_err("XCOPY descriptor list length %u exceeds maximum %u\n",
812 tdll + sdll, RCR_OP_MAX_DESC_LIST_LEN);
813 ret = TCM_PARAMETER_LIST_LENGTH_ERROR;
814 goto out;
815 }
816
817 inline_dl = get_unaligned_be32(&p[12]);
818 if (inline_dl != 0) {
819 pr_err("XCOPY with non zero inline data length\n");
820 goto out;
821 }
822
823 if (se_cmd->data_length < (XCOPY_HDR_LEN + tdll + sdll + inline_dl)) {
824 pr_err("XCOPY parameter truncation: data length %u too small "
825 "for tdll: %hu sdll: %u inline_dl: %u\n",
826 se_cmd->data_length, tdll, sdll, inline_dl);
827 ret = TCM_PARAMETER_LIST_LENGTH_ERROR;
828 goto out;
829 }
830
831 pr_debug("Processing XCOPY with list_id: 0x%02x list_id_usage: 0x%02x"
832 " tdll: %hu sdll: %u inline_dl: %u\n", list_id, list_id_usage,
833 tdll, sdll, inline_dl);
834
835 /*
836 * skip over the target descriptors until segment descriptors
837 * have been passed - CSCD ids are needed to determine src and dest.
838 */
839 seg_desc = &p[16] + tdll;
840
841 rc = target_xcopy_parse_segment_descriptors(xop, seg_desc, sdll, &ret);
842 if (rc <= 0)
843 goto out;
844
845 pr_debug("XCOPY: Processed %d segment descriptors, length: %u\n", rc,
846 rc * XCOPY_SEGMENT_DESC_LEN);
847
848 rc = target_xcopy_parse_target_descriptors(se_cmd, xop, &p[16], tdll, &ret);
849 if (rc <= 0)
850 goto out;
851
852 if (xop->src_dev->dev_attrib.block_size !=
853 xop->dst_dev->dev_attrib.block_size) {
854 pr_err("XCOPY: Non matching src_dev block_size: %u + dst_dev"
855 " block_size: %u currently unsupported\n",
856 xop->src_dev->dev_attrib.block_size,
857 xop->dst_dev->dev_attrib.block_size);
858 xcopy_pt_undepend_remotedev(xop);
859 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
860 goto out;
861 }
862
863 pr_debug("XCOPY: Processed %d target descriptors, length: %u\n", rc,
864 rc * XCOPY_TARGET_DESC_LEN);
865 transport_kunmap_data_sg(se_cmd);
866 return TCM_NO_SENSE;
867
868out:
869 if (p)
870 transport_kunmap_data_sg(se_cmd);
871 return ret;
872}
873
874sense_reason_t target_do_xcopy(struct se_cmd *se_cmd)
875{
876 struct se_device *dev = se_cmd->se_dev;
877 struct xcopy_op *xop;
878 unsigned int sa;
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_obj(struct xcopy_op);
902 if (!xop)
903 goto err;
904 xop->xop_se_cmd = se_cmd;
905 INIT_WORK(&xop->xop_work, target_xcopy_do_work);
906 if (WARN_ON_ONCE(!queue_work(xcopy_wq, &xop->xop_work)))
907 goto free;
908 return TCM_NO_SENSE;
909
910free:
911 kfree(xop);
912
913err:
914 return TCM_OUT_OF_RESOURCES;
915}
916
917static sense_reason_t target_rcr_operating_parameters(struct se_cmd *se_cmd)
918{
919 unsigned char *p;
920
921 p = transport_kmap_data_sg(se_cmd);
922 if (!p) {
923 pr_err("transport_kmap_data_sg failed in"
924 " target_rcr_operating_parameters\n");
925 return TCM_OUT_OF_RESOURCES;
926 }
927
928 if (se_cmd->data_length < 54) {
929 pr_err("Receive Copy Results Op Parameters length"
930 " too small: %u\n", se_cmd->data_length);
931 transport_kunmap_data_sg(se_cmd);
932 return TCM_INVALID_CDB_FIELD;
933 }
934 /*
935 * Set SNLID=1 (Supports no List ID)
936 */
937 p[4] = 0x1;
938 /*
939 * MAXIMUM TARGET DESCRIPTOR COUNT
940 */
941 put_unaligned_be16(RCR_OP_MAX_TARGET_DESC_COUNT, &p[8]);
942 /*
943 * MAXIMUM SEGMENT DESCRIPTOR COUNT
944 */
945 put_unaligned_be16(RCR_OP_MAX_SG_DESC_COUNT, &p[10]);
946 /*
947 * MAXIMUM DESCRIPTOR LIST LENGTH
948 */
949 put_unaligned_be32(RCR_OP_MAX_DESC_LIST_LEN, &p[12]);
950 /*
951 * MAXIMUM SEGMENT LENGTH
952 */
953 put_unaligned_be32(RCR_OP_MAX_SEGMENT_LEN, &p[16]);
954 /*
955 * MAXIMUM INLINE DATA LENGTH for SA 0x04 (NOT SUPPORTED)
956 */
957 put_unaligned_be32(0x0, &p[20]);
958 /*
959 * HELD DATA LIMIT
960 */
961 put_unaligned_be32(0x0, &p[24]);
962 /*
963 * MAXIMUM STREAM DEVICE TRANSFER SIZE
964 */
965 put_unaligned_be32(0x0, &p[28]);
966 /*
967 * TOTAL CONCURRENT COPIES
968 */
969 put_unaligned_be16(RCR_OP_TOTAL_CONCURR_COPIES, &p[34]);
970 /*
971 * MAXIMUM CONCURRENT COPIES
972 */
973 p[36] = RCR_OP_MAX_CONCURR_COPIES;
974 /*
975 * DATA SEGMENT GRANULARITY (log 2)
976 */
977 p[37] = RCR_OP_DATA_SEG_GRAN_LOG2;
978 /*
979 * INLINE DATA GRANULARITY log 2)
980 */
981 p[38] = RCR_OP_INLINE_DATA_GRAN_LOG2;
982 /*
983 * HELD DATA GRANULARITY
984 */
985 p[39] = RCR_OP_HELD_DATA_GRAN_LOG2;
986 /*
987 * IMPLEMENTED DESCRIPTOR LIST LENGTH
988 */
989 p[43] = 0x2;
990 /*
991 * List of implemented descriptor type codes (ordered)
992 */
993 p[44] = 0x02; /* Copy Block to Block device */
994 p[45] = 0xe4; /* Identification descriptor target descriptor */
995
996 /*
997 * AVAILABLE DATA (n-3)
998 */
999 put_unaligned_be32(42, &p[0]);
1000
1001 transport_kunmap_data_sg(se_cmd);
1002 target_complete_cmd(se_cmd, SAM_STAT_GOOD);
1003
1004 return TCM_NO_SENSE;
1005}
1006
1007sense_reason_t target_do_receive_copy_results(struct se_cmd *se_cmd)
1008{
1009 unsigned char *cdb = &se_cmd->t_task_cdb[0];
1010 int sa = (cdb[1] & 0x1f), list_id = cdb[2];
1011 struct se_device *dev = se_cmd->se_dev;
1012 sense_reason_t rc = TCM_NO_SENSE;
1013
1014 if (!dev->dev_attrib.emulate_3pc) {
1015 pr_debug("Third-party copy operations explicitly disabled\n");
1016 return TCM_UNSUPPORTED_SCSI_OPCODE;
1017 }
1018
1019 pr_debug("Entering target_do_receive_copy_results: SA: 0x%02x, List ID:"
1020 " 0x%02x, AL: %u\n", sa, list_id, se_cmd->data_length);
1021
1022 if (list_id != 0) {
1023 pr_err("Receive Copy Results with non zero list identifier"
1024 " not supported\n");
1025 return TCM_INVALID_CDB_FIELD;
1026 }
1027
1028 switch (sa) {
1029 case RCR_SA_OPERATING_PARAMETERS:
1030 rc = target_rcr_operating_parameters(se_cmd);
1031 break;
1032 case RCR_SA_COPY_STATUS:
1033 case RCR_SA_RECEIVE_DATA:
1034 case RCR_SA_FAILED_SEGMENT_DETAILS:
1035 default:
1036 pr_err("Unsupported SA for receive copy results: 0x%02x\n", sa);
1037 return TCM_INVALID_CDB_FIELD;
1038 }
1039
1040 return rc;
1041}