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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
36/**
37 * target_xcopy_locate_se_dev_e4_iter - compare XCOPY NAA device identifiers
38 *
39 * @se_dev: device being considered for match
40 * @dev_wwn: XCOPY requested NAA dev_wwn
41 * @return: 1 on match, 0 on no-match
42 */
43static int target_xcopy_locate_se_dev_e4_iter(struct se_device *se_dev,
44 const unsigned char *dev_wwn)
45{
46 unsigned char tmp_dev_wwn[XCOPY_NAA_IEEE_REGEX_LEN];
47 int rc;
48
49 if (!se_dev->dev_attrib.emulate_3pc) {
50 pr_debug("XCOPY: emulate_3pc disabled on se_dev %p\n", se_dev);
51 return 0;
52 }
53
54 memset(&tmp_dev_wwn[0], 0, XCOPY_NAA_IEEE_REGEX_LEN);
55 spc_gen_naa_6h_vendor_specific(se_dev, &tmp_dev_wwn[0]);
56
57 rc = memcmp(&tmp_dev_wwn[0], dev_wwn, XCOPY_NAA_IEEE_REGEX_LEN);
58 if (rc != 0) {
59 pr_debug("XCOPY: skip non-matching: %*ph\n",
60 XCOPY_NAA_IEEE_REGEX_LEN, tmp_dev_wwn);
61 return 0;
62 }
63 pr_debug("XCOPY 0xe4: located se_dev: %p\n", se_dev);
64
65 return 1;
66}
67
68static int target_xcopy_locate_se_dev_e4(struct se_session *sess,
69 const unsigned char *dev_wwn,
70 struct se_device **_found_dev,
71 struct percpu_ref **_found_lun_ref)
72{
73 struct se_dev_entry *deve;
74 struct se_node_acl *nacl;
75 struct se_lun *this_lun = NULL;
76 struct se_device *found_dev = NULL;
77
78 /* cmd with NULL sess indicates no associated $FABRIC_MOD */
79 if (!sess)
80 goto err_out;
81
82 pr_debug("XCOPY 0xe4: searching for: %*ph\n",
83 XCOPY_NAA_IEEE_REGEX_LEN, dev_wwn);
84
85 nacl = sess->se_node_acl;
86 rcu_read_lock();
87 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
88 struct se_device *this_dev;
89 int rc;
90
91 this_lun = deve->se_lun;
92 this_dev = rcu_dereference_raw(this_lun->lun_se_dev);
93
94 rc = target_xcopy_locate_se_dev_e4_iter(this_dev, dev_wwn);
95 if (rc) {
96 if (percpu_ref_tryget_live(&this_lun->lun_ref))
97 found_dev = this_dev;
98 break;
99 }
100 }
101 rcu_read_unlock();
102 if (found_dev == NULL)
103 goto err_out;
104
105 pr_debug("lun_ref held for se_dev: %p se_dev->se_dev_group: %p\n",
106 found_dev, &found_dev->dev_group);
107 *_found_dev = found_dev;
108 *_found_lun_ref = &this_lun->lun_ref;
109 return 0;
110err_out:
111 pr_debug_ratelimited("Unable to locate 0xe4 descriptor for EXTENDED_COPY\n");
112 return -EINVAL;
113}
114
115static int target_xcopy_parse_tiddesc_e4(struct se_cmd *se_cmd, struct xcopy_op *xop,
116 unsigned char *p, unsigned short cscd_index)
117{
118 unsigned char *desc = p;
119 unsigned short ript;
120 u8 desig_len;
121 /*
122 * Extract RELATIVE INITIATOR PORT IDENTIFIER
123 */
124 ript = get_unaligned_be16(&desc[2]);
125 pr_debug("XCOPY 0xe4: RELATIVE INITIATOR PORT IDENTIFIER: %hu\n", ript);
126 /*
127 * Check for supported code set, association, and designator type
128 */
129 if ((desc[4] & 0x0f) != 0x1) {
130 pr_err("XCOPY 0xe4: code set of non binary type not supported\n");
131 return -EINVAL;
132 }
133 if ((desc[5] & 0x30) != 0x00) {
134 pr_err("XCOPY 0xe4: association other than LUN not supported\n");
135 return -EINVAL;
136 }
137 if ((desc[5] & 0x0f) != 0x3) {
138 pr_err("XCOPY 0xe4: designator type unsupported: 0x%02x\n",
139 (desc[5] & 0x0f));
140 return -EINVAL;
141 }
142 /*
143 * Check for matching 16 byte length for NAA IEEE Registered Extended
144 * Assigned designator
145 */
146 desig_len = desc[7];
147 if (desig_len != XCOPY_NAA_IEEE_REGEX_LEN) {
148 pr_err("XCOPY 0xe4: invalid desig_len: %d\n", (int)desig_len);
149 return -EINVAL;
150 }
151 pr_debug("XCOPY 0xe4: desig_len: %d\n", (int)desig_len);
152 /*
153 * Check for NAA IEEE Registered Extended Assigned header..
154 */
155 if ((desc[8] & 0xf0) != 0x60) {
156 pr_err("XCOPY 0xe4: Unsupported DESIGNATOR TYPE: 0x%02x\n",
157 (desc[8] & 0xf0));
158 return -EINVAL;
159 }
160
161 if (cscd_index != xop->stdi && cscd_index != xop->dtdi) {
162 pr_debug("XCOPY 0xe4: ignoring CSCD entry %d - neither src nor "
163 "dest\n", cscd_index);
164 return 0;
165 }
166
167 if (cscd_index == xop->stdi) {
168 memcpy(&xop->src_tid_wwn[0], &desc[8], XCOPY_NAA_IEEE_REGEX_LEN);
169 /*
170 * Determine if the source designator matches the local device
171 */
172 if (!memcmp(&xop->local_dev_wwn[0], &xop->src_tid_wwn[0],
173 XCOPY_NAA_IEEE_REGEX_LEN)) {
174 xop->op_origin = XCOL_SOURCE_RECV_OP;
175 xop->src_dev = se_cmd->se_dev;
176 pr_debug("XCOPY 0xe4: Set xop->src_dev %p from source"
177 " received xop\n", xop->src_dev);
178 }
179 }
180
181 if (cscd_index == xop->dtdi) {
182 memcpy(&xop->dst_tid_wwn[0], &desc[8], XCOPY_NAA_IEEE_REGEX_LEN);
183 /*
184 * Determine if the destination designator matches the local
185 * device. If @cscd_index corresponds to both source (stdi) and
186 * destination (dtdi), or dtdi comes after stdi, then
187 * XCOL_DEST_RECV_OP wins.
188 */
189 if (!memcmp(&xop->local_dev_wwn[0], &xop->dst_tid_wwn[0],
190 XCOPY_NAA_IEEE_REGEX_LEN)) {
191 xop->op_origin = XCOL_DEST_RECV_OP;
192 xop->dst_dev = se_cmd->se_dev;
193 pr_debug("XCOPY 0xe4: Set xop->dst_dev: %p from destination"
194 " received xop\n", xop->dst_dev);
195 }
196 }
197
198 return 0;
199}
200
201static int target_xcopy_parse_target_descriptors(struct se_cmd *se_cmd,
202 struct xcopy_op *xop, unsigned char *p,
203 unsigned short tdll, sense_reason_t *sense_ret)
204{
205 struct se_device *local_dev = se_cmd->se_dev;
206 unsigned char *desc = p;
207 int offset = tdll % XCOPY_TARGET_DESC_LEN, rc;
208 unsigned short cscd_index = 0;
209 unsigned short start = 0;
210
211 *sense_ret = TCM_INVALID_PARAMETER_LIST;
212
213 if (offset != 0) {
214 pr_err("XCOPY target descriptor list length is not"
215 " multiple of %d\n", XCOPY_TARGET_DESC_LEN);
216 *sense_ret = TCM_UNSUPPORTED_TARGET_DESC_TYPE_CODE;
217 return -EINVAL;
218 }
219 if (tdll > RCR_OP_MAX_TARGET_DESC_COUNT * XCOPY_TARGET_DESC_LEN) {
220 pr_err("XCOPY target descriptor supports a maximum"
221 " two src/dest descriptors, tdll: %hu too large..\n", tdll);
222 /* spc4r37 6.4.3.4 CSCD DESCRIPTOR LIST LENGTH field */
223 *sense_ret = TCM_TOO_MANY_TARGET_DESCS;
224 return -EINVAL;
225 }
226 /*
227 * Generate an IEEE Registered Extended designator based upon the
228 * se_device the XCOPY was received upon..
229 */
230 memset(&xop->local_dev_wwn[0], 0, XCOPY_NAA_IEEE_REGEX_LEN);
231 spc_gen_naa_6h_vendor_specific(local_dev, &xop->local_dev_wwn[0]);
232
233 while (start < tdll) {
234 /*
235 * Check target descriptor identification with 0xE4 type, and
236 * compare the current index with the CSCD descriptor IDs in
237 * the segment descriptor. Use VPD 0x83 WWPN matching ..
238 */
239 switch (desc[0]) {
240 case 0xe4:
241 rc = target_xcopy_parse_tiddesc_e4(se_cmd, xop,
242 &desc[0], cscd_index);
243 if (rc != 0)
244 goto out;
245 start += XCOPY_TARGET_DESC_LEN;
246 desc += XCOPY_TARGET_DESC_LEN;
247 cscd_index++;
248 break;
249 default:
250 pr_err("XCOPY unsupported descriptor type code:"
251 " 0x%02x\n", desc[0]);
252 *sense_ret = TCM_UNSUPPORTED_TARGET_DESC_TYPE_CODE;
253 goto out;
254 }
255 }
256
257 switch (xop->op_origin) {
258 case XCOL_SOURCE_RECV_OP:
259 rc = target_xcopy_locate_se_dev_e4(se_cmd->se_sess,
260 xop->dst_tid_wwn,
261 &xop->dst_dev,
262 &xop->remote_lun_ref);
263 break;
264 case XCOL_DEST_RECV_OP:
265 rc = target_xcopy_locate_se_dev_e4(se_cmd->se_sess,
266 xop->src_tid_wwn,
267 &xop->src_dev,
268 &xop->remote_lun_ref);
269 break;
270 default:
271 pr_err("XCOPY CSCD descriptor IDs not found in CSCD list - "
272 "stdi: %hu dtdi: %hu\n", xop->stdi, xop->dtdi);
273 rc = -EINVAL;
274 break;
275 }
276 /*
277 * If a matching IEEE NAA 0x83 descriptor for the requested device
278 * is not located on this node, return COPY_ABORTED with ASQ/ASQC
279 * 0x0d/0x02 - COPY_TARGET_DEVICE_NOT_REACHABLE to request the
280 * initiator to fall back to normal copy method.
281 */
282 if (rc < 0) {
283 *sense_ret = TCM_COPY_TARGET_DEVICE_NOT_REACHABLE;
284 goto out;
285 }
286
287 pr_debug("XCOPY TGT desc: Source dev: %p NAA IEEE WWN: 0x%16phN\n",
288 xop->src_dev, &xop->src_tid_wwn[0]);
289 pr_debug("XCOPY TGT desc: Dest dev: %p NAA IEEE WWN: 0x%16phN\n",
290 xop->dst_dev, &xop->dst_tid_wwn[0]);
291
292 return cscd_index;
293
294out:
295 return -EINVAL;
296}
297
298static int target_xcopy_parse_segdesc_02(struct xcopy_op *xop, unsigned char *p)
299{
300 unsigned char *desc = p;
301 int dc = (desc[1] & 0x02);
302 unsigned short desc_len;
303
304 desc_len = get_unaligned_be16(&desc[2]);
305 if (desc_len != 0x18) {
306 pr_err("XCOPY segment desc 0x02: Illegal desc_len:"
307 " %hu\n", desc_len);
308 return -EINVAL;
309 }
310
311 xop->stdi = get_unaligned_be16(&desc[4]);
312 xop->dtdi = get_unaligned_be16(&desc[6]);
313
314 if (xop->stdi > XCOPY_CSCD_DESC_ID_LIST_OFF_MAX ||
315 xop->dtdi > XCOPY_CSCD_DESC_ID_LIST_OFF_MAX) {
316 pr_err("XCOPY segment desc 0x02: unsupported CSCD ID > 0x%x; stdi: %hu dtdi: %hu\n",
317 XCOPY_CSCD_DESC_ID_LIST_OFF_MAX, xop->stdi, xop->dtdi);
318 return -EINVAL;
319 }
320
321 pr_debug("XCOPY seg desc 0x02: desc_len: %hu stdi: %hu dtdi: %hu, DC: %d\n",
322 desc_len, xop->stdi, xop->dtdi, dc);
323
324 xop->nolb = get_unaligned_be16(&desc[10]);
325 xop->src_lba = get_unaligned_be64(&desc[12]);
326 xop->dst_lba = get_unaligned_be64(&desc[20]);
327 pr_debug("XCOPY seg desc 0x02: nolb: %hu src_lba: %llu dst_lba: %llu\n",
328 xop->nolb, (unsigned long long)xop->src_lba,
329 (unsigned long long)xop->dst_lba);
330
331 return 0;
332}
333
334static int target_xcopy_parse_segment_descriptors(struct xcopy_op *xop,
335 unsigned char *p, unsigned int sdll,
336 sense_reason_t *sense_ret)
337{
338 unsigned char *desc = p;
339 unsigned int start = 0;
340 int offset = sdll % XCOPY_SEGMENT_DESC_LEN, rc, ret = 0;
341
342 *sense_ret = TCM_INVALID_PARAMETER_LIST;
343
344 if (offset != 0) {
345 pr_err("XCOPY segment descriptor list length is not"
346 " multiple of %d\n", XCOPY_SEGMENT_DESC_LEN);
347 *sense_ret = TCM_UNSUPPORTED_SEGMENT_DESC_TYPE_CODE;
348 return -EINVAL;
349 }
350 if (sdll > RCR_OP_MAX_SG_DESC_COUNT * XCOPY_SEGMENT_DESC_LEN) {
351 pr_err("XCOPY supports %u segment descriptor(s), sdll: %u too"
352 " large..\n", RCR_OP_MAX_SG_DESC_COUNT, sdll);
353 /* spc4r37 6.4.3.5 SEGMENT DESCRIPTOR LIST LENGTH field */
354 *sense_ret = TCM_TOO_MANY_SEGMENT_DESCS;
355 return -EINVAL;
356 }
357
358 while (start < sdll) {
359 /*
360 * Check segment descriptor type code for block -> block
361 */
362 switch (desc[0]) {
363 case 0x02:
364 rc = target_xcopy_parse_segdesc_02(xop, desc);
365 if (rc < 0)
366 goto out;
367
368 ret++;
369 start += XCOPY_SEGMENT_DESC_LEN;
370 desc += XCOPY_SEGMENT_DESC_LEN;
371 break;
372 default:
373 pr_err("XCOPY unsupported segment descriptor"
374 "type: 0x%02x\n", desc[0]);
375 *sense_ret = TCM_UNSUPPORTED_SEGMENT_DESC_TYPE_CODE;
376 goto out;
377 }
378 }
379
380 return ret;
381
382out:
383 return -EINVAL;
384}
385
386/*
387 * Start xcopy_pt ops
388 */
389
390struct xcopy_pt_cmd {
391 struct se_cmd se_cmd;
392 struct completion xpt_passthrough_sem;
393 unsigned char sense_buffer[TRANSPORT_SENSE_BUFFER];
394};
395
396struct se_portal_group xcopy_pt_tpg;
397static struct se_session xcopy_pt_sess;
398static struct se_node_acl xcopy_pt_nacl;
399
400static int xcopy_pt_get_cmd_state(struct se_cmd *se_cmd)
401{
402 return 0;
403}
404
405static void xcopy_pt_undepend_remotedev(struct xcopy_op *xop)
406{
407 if (xop->op_origin == XCOL_SOURCE_RECV_OP)
408 pr_debug("putting dst lun_ref for %p\n", xop->dst_dev);
409 else
410 pr_debug("putting src lun_ref for %p\n", xop->src_dev);
411
412 percpu_ref_put(xop->remote_lun_ref);
413}
414
415static void xcopy_pt_release_cmd(struct se_cmd *se_cmd)
416{
417 struct xcopy_pt_cmd *xpt_cmd = container_of(se_cmd,
418 struct xcopy_pt_cmd, se_cmd);
419
420 /* xpt_cmd is on the stack, nothing to free here */
421 pr_debug("xpt_cmd done: %p\n", xpt_cmd);
422}
423
424static int xcopy_pt_check_stop_free(struct se_cmd *se_cmd)
425{
426 struct xcopy_pt_cmd *xpt_cmd = container_of(se_cmd,
427 struct xcopy_pt_cmd, se_cmd);
428
429 complete(&xpt_cmd->xpt_passthrough_sem);
430 return 0;
431}
432
433static int xcopy_pt_write_pending(struct se_cmd *se_cmd)
434{
435 return 0;
436}
437
438static int xcopy_pt_queue_data_in(struct se_cmd *se_cmd)
439{
440 return 0;
441}
442
443static int xcopy_pt_queue_status(struct se_cmd *se_cmd)
444{
445 return 0;
446}
447
448static const struct target_core_fabric_ops xcopy_pt_tfo = {
449 .fabric_name = "xcopy-pt",
450 .get_cmd_state = xcopy_pt_get_cmd_state,
451 .release_cmd = xcopy_pt_release_cmd,
452 .check_stop_free = xcopy_pt_check_stop_free,
453 .write_pending = xcopy_pt_write_pending,
454 .queue_data_in = xcopy_pt_queue_data_in,
455 .queue_status = xcopy_pt_queue_status,
456};
457
458/*
459 * End xcopy_pt_ops
460 */
461
462int target_xcopy_setup_pt(void)
463{
464 int ret;
465
466 xcopy_wq = alloc_workqueue("xcopy_wq", WQ_MEM_RECLAIM, 0);
467 if (!xcopy_wq) {
468 pr_err("Unable to allocate xcopy_wq\n");
469 return -ENOMEM;
470 }
471
472 memset(&xcopy_pt_tpg, 0, sizeof(struct se_portal_group));
473 INIT_LIST_HEAD(&xcopy_pt_tpg.acl_node_list);
474 INIT_LIST_HEAD(&xcopy_pt_tpg.tpg_sess_list);
475
476 xcopy_pt_tpg.se_tpg_tfo = &xcopy_pt_tfo;
477
478 memset(&xcopy_pt_nacl, 0, sizeof(struct se_node_acl));
479 INIT_LIST_HEAD(&xcopy_pt_nacl.acl_list);
480 INIT_LIST_HEAD(&xcopy_pt_nacl.acl_sess_list);
481 memset(&xcopy_pt_sess, 0, sizeof(struct se_session));
482 ret = transport_init_session(&xcopy_pt_sess);
483 if (ret < 0)
484 goto destroy_wq;
485
486 xcopy_pt_nacl.se_tpg = &xcopy_pt_tpg;
487 xcopy_pt_nacl.nacl_sess = &xcopy_pt_sess;
488
489 xcopy_pt_sess.se_tpg = &xcopy_pt_tpg;
490 xcopy_pt_sess.se_node_acl = &xcopy_pt_nacl;
491
492 return 0;
493
494destroy_wq:
495 destroy_workqueue(xcopy_wq);
496 xcopy_wq = NULL;
497 return ret;
498}
499
500void target_xcopy_release_pt(void)
501{
502 if (xcopy_wq) {
503 destroy_workqueue(xcopy_wq);
504 transport_uninit_session(&xcopy_pt_sess);
505 }
506}
507
508/*
509 * target_xcopy_setup_pt_cmd - set up a pass-through command
510 * @xpt_cmd: Data structure to initialize.
511 * @xop: Describes the XCOPY operation received from an initiator.
512 * @se_dev: Backend device to associate with @xpt_cmd if
513 * @remote_port == true.
514 * @cdb: SCSI CDB to be copied into @xpt_cmd.
515 * @remote_port: If false, use the LUN through which the XCOPY command has
516 * been received. If true, use @se_dev->xcopy_lun.
517 *
518 * Set up a SCSI command (READ or WRITE) that will be used to execute an
519 * XCOPY command.
520 */
521static int target_xcopy_setup_pt_cmd(
522 struct xcopy_pt_cmd *xpt_cmd,
523 struct xcopy_op *xop,
524 struct se_device *se_dev,
525 unsigned char *cdb,
526 bool remote_port)
527{
528 struct se_cmd *cmd = &xpt_cmd->se_cmd;
529
530 /*
531 * Setup LUN+port to honor reservations based upon xop->op_origin for
532 * X-COPY PUSH or X-COPY PULL based upon where the CDB was received.
533 */
534 if (remote_port) {
535 cmd->se_lun = &se_dev->xcopy_lun;
536 cmd->se_dev = se_dev;
537 } else {
538 cmd->se_lun = xop->xop_se_cmd->se_lun;
539 cmd->se_dev = xop->xop_se_cmd->se_dev;
540 }
541 cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
542
543 if (target_cmd_init_cdb(cmd, cdb, GFP_KERNEL))
544 return -EINVAL;
545
546 cmd->tag = 0;
547 if (target_cmd_parse_cdb(cmd))
548 return -EINVAL;
549
550 if (transport_generic_map_mem_to_cmd(cmd, xop->xop_data_sg,
551 xop->xop_data_nents, NULL, 0))
552 return -EINVAL;
553
554 pr_debug("Setup PASSTHROUGH_NOALLOC t_data_sg: %p t_data_nents:"
555 " %u\n", cmd->t_data_sg, cmd->t_data_nents);
556
557 return 0;
558}
559
560static int target_xcopy_issue_pt_cmd(struct xcopy_pt_cmd *xpt_cmd)
561{
562 struct se_cmd *se_cmd = &xpt_cmd->se_cmd;
563 sense_reason_t sense_rc;
564
565 sense_rc = transport_generic_new_cmd(se_cmd);
566 if (sense_rc)
567 return -EINVAL;
568
569 if (se_cmd->data_direction == DMA_TO_DEVICE)
570 target_execute_cmd(se_cmd);
571
572 wait_for_completion_interruptible(&xpt_cmd->xpt_passthrough_sem);
573
574 pr_debug("target_xcopy_issue_pt_cmd(): SCSI status: 0x%02x\n",
575 se_cmd->scsi_status);
576
577 return (se_cmd->scsi_status) ? -EINVAL : 0;
578}
579
580static int target_xcopy_read_source(
581 struct se_cmd *ec_cmd,
582 struct xcopy_op *xop,
583 struct se_device *src_dev,
584 sector_t src_lba,
585 u32 src_bytes)
586{
587 struct xcopy_pt_cmd xpt_cmd;
588 struct se_cmd *se_cmd = &xpt_cmd.se_cmd;
589 u32 transfer_length_block = src_bytes / src_dev->dev_attrib.block_size;
590 int rc;
591 unsigned char cdb[16];
592 bool remote_port = (xop->op_origin == XCOL_DEST_RECV_OP);
593
594 memset(&xpt_cmd, 0, sizeof(xpt_cmd));
595 init_completion(&xpt_cmd.xpt_passthrough_sem);
596
597 memset(&cdb[0], 0, 16);
598 cdb[0] = READ_16;
599 put_unaligned_be64(src_lba, &cdb[2]);
600 put_unaligned_be32(transfer_length_block, &cdb[10]);
601 pr_debug("XCOPY: Built READ_16: LBA: %llu Blocks: %u Length: %u\n",
602 (unsigned long long)src_lba, transfer_length_block, src_bytes);
603
604 __target_init_cmd(se_cmd, &xcopy_pt_tfo, &xcopy_pt_sess, src_bytes,
605 DMA_FROM_DEVICE, 0, &xpt_cmd.sense_buffer[0], 0);
606
607 rc = target_xcopy_setup_pt_cmd(&xpt_cmd, xop, src_dev, &cdb[0],
608 remote_port);
609 if (rc < 0) {
610 ec_cmd->scsi_status = se_cmd->scsi_status;
611 goto out;
612 }
613
614 pr_debug("XCOPY-READ: Saved xop->xop_data_sg: %p, num: %u for READ"
615 " memory\n", xop->xop_data_sg, xop->xop_data_nents);
616
617 rc = target_xcopy_issue_pt_cmd(&xpt_cmd);
618 if (rc < 0)
619 ec_cmd->scsi_status = se_cmd->scsi_status;
620out:
621 transport_generic_free_cmd(se_cmd, 0);
622 return rc;
623}
624
625static int target_xcopy_write_destination(
626 struct se_cmd *ec_cmd,
627 struct xcopy_op *xop,
628 struct se_device *dst_dev,
629 sector_t dst_lba,
630 u32 dst_bytes)
631{
632 struct xcopy_pt_cmd xpt_cmd;
633 struct se_cmd *se_cmd = &xpt_cmd.se_cmd;
634 u32 transfer_length_block = dst_bytes / dst_dev->dev_attrib.block_size;
635 int rc;
636 unsigned char cdb[16];
637 bool remote_port = (xop->op_origin == XCOL_SOURCE_RECV_OP);
638
639 memset(&xpt_cmd, 0, sizeof(xpt_cmd));
640 init_completion(&xpt_cmd.xpt_passthrough_sem);
641
642 memset(&cdb[0], 0, 16);
643 cdb[0] = WRITE_16;
644 put_unaligned_be64(dst_lba, &cdb[2]);
645 put_unaligned_be32(transfer_length_block, &cdb[10]);
646 pr_debug("XCOPY: Built WRITE_16: LBA: %llu Blocks: %u Length: %u\n",
647 (unsigned long long)dst_lba, transfer_length_block, dst_bytes);
648
649 __target_init_cmd(se_cmd, &xcopy_pt_tfo, &xcopy_pt_sess, dst_bytes,
650 DMA_TO_DEVICE, 0, &xpt_cmd.sense_buffer[0], 0);
651
652 rc = target_xcopy_setup_pt_cmd(&xpt_cmd, xop, dst_dev, &cdb[0],
653 remote_port);
654 if (rc < 0) {
655 ec_cmd->scsi_status = se_cmd->scsi_status;
656 goto out;
657 }
658
659 rc = target_xcopy_issue_pt_cmd(&xpt_cmd);
660 if (rc < 0)
661 ec_cmd->scsi_status = se_cmd->scsi_status;
662out:
663 transport_generic_free_cmd(se_cmd, 0);
664 return rc;
665}
666
667static void target_xcopy_do_work(struct work_struct *work)
668{
669 struct xcopy_op *xop = container_of(work, struct xcopy_op, xop_work);
670 struct se_cmd *ec_cmd = xop->xop_se_cmd;
671 struct se_device *src_dev, *dst_dev;
672 sector_t src_lba, dst_lba, end_lba;
673 unsigned long long max_bytes, max_bytes_src, max_bytes_dst, max_blocks;
674 int rc = 0;
675 unsigned short nolb;
676 unsigned int copied_bytes = 0;
677 sense_reason_t sense_rc;
678
679 sense_rc = target_parse_xcopy_cmd(xop);
680 if (sense_rc != TCM_NO_SENSE)
681 goto err_free;
682
683 if (WARN_ON_ONCE(!xop->src_dev) || WARN_ON_ONCE(!xop->dst_dev)) {
684 sense_rc = TCM_INVALID_PARAMETER_LIST;
685 goto err_free;
686 }
687
688 src_dev = xop->src_dev;
689 dst_dev = xop->dst_dev;
690 src_lba = xop->src_lba;
691 dst_lba = xop->dst_lba;
692 nolb = xop->nolb;
693 end_lba = src_lba + nolb;
694 /*
695 * Break up XCOPY I/O into hw_max_sectors * hw_block_size sized
696 * I/O based on the smallest max_bytes between src_dev + dst_dev
697 */
698 max_bytes_src = (unsigned long long) src_dev->dev_attrib.hw_max_sectors *
699 src_dev->dev_attrib.hw_block_size;
700 max_bytes_dst = (unsigned long long) dst_dev->dev_attrib.hw_max_sectors *
701 dst_dev->dev_attrib.hw_block_size;
702
703 max_bytes = min_t(u64, max_bytes_src, max_bytes_dst);
704 max_bytes = min_t(u64, max_bytes, XCOPY_MAX_BYTES);
705
706 /*
707 * Using shift instead of the division because otherwise GCC
708 * generates __udivdi3 that is missing on i386
709 */
710 max_blocks = max_bytes >> ilog2(src_dev->dev_attrib.block_size);
711
712 pr_debug("%s: nolb: %u, max_blocks: %llu end_lba: %llu\n", __func__,
713 nolb, max_blocks, (unsigned long long)end_lba);
714 pr_debug("%s: Starting src_lba: %llu, dst_lba: %llu\n", __func__,
715 (unsigned long long)src_lba, (unsigned long long)dst_lba);
716
717 while (nolb) {
718 u32 cur_bytes = min_t(u64, max_bytes, nolb * src_dev->dev_attrib.block_size);
719 unsigned short cur_nolb = cur_bytes / src_dev->dev_attrib.block_size;
720
721 if (cur_bytes != xop->xop_data_bytes) {
722 /*
723 * (Re)allocate a buffer large enough to hold the XCOPY
724 * I/O size, which can be reused each read / write loop.
725 */
726 target_free_sgl(xop->xop_data_sg, xop->xop_data_nents);
727 rc = target_alloc_sgl(&xop->xop_data_sg,
728 &xop->xop_data_nents,
729 cur_bytes,
730 false, false);
731 if (rc < 0)
732 goto out;
733 xop->xop_data_bytes = cur_bytes;
734 }
735
736 pr_debug("%s: Calling read src_dev: %p src_lba: %llu, cur_nolb: %hu\n",
737 __func__, src_dev, (unsigned long long)src_lba, cur_nolb);
738
739 rc = target_xcopy_read_source(ec_cmd, xop, src_dev, src_lba, cur_bytes);
740 if (rc < 0)
741 goto out;
742
743 src_lba += cur_bytes / src_dev->dev_attrib.block_size;
744 pr_debug("%s: Incremented READ src_lba to %llu\n", __func__,
745 (unsigned long long)src_lba);
746
747 pr_debug("%s: Calling write dst_dev: %p dst_lba: %llu, cur_nolb: %u\n",
748 __func__, dst_dev, (unsigned long long)dst_lba, cur_nolb);
749
750 rc = target_xcopy_write_destination(ec_cmd, xop, dst_dev,
751 dst_lba, cur_bytes);
752 if (rc < 0)
753 goto out;
754
755 dst_lba += cur_bytes / dst_dev->dev_attrib.block_size;
756 pr_debug("%s: Incremented WRITE dst_lba to %llu\n", __func__,
757 (unsigned long long)dst_lba);
758
759 copied_bytes += cur_bytes;
760 nolb -= cur_bytes / src_dev->dev_attrib.block_size;
761 }
762
763 xcopy_pt_undepend_remotedev(xop);
764 target_free_sgl(xop->xop_data_sg, xop->xop_data_nents);
765 kfree(xop);
766
767 pr_debug("%s: Final src_lba: %llu, dst_lba: %llu\n", __func__,
768 (unsigned long long)src_lba, (unsigned long long)dst_lba);
769 pr_debug("%s: Blocks copied: %u, Bytes Copied: %u\n", __func__,
770 copied_bytes / dst_dev->dev_attrib.block_size, copied_bytes);
771
772 pr_debug("%s: Setting X-COPY GOOD status -> sending response\n", __func__);
773 target_complete_cmd(ec_cmd, SAM_STAT_GOOD);
774 return;
775
776out:
777 /*
778 * The XCOPY command was aborted after some data was transferred.
779 * Terminate command with CHECK CONDITION status, with the sense key
780 * set to COPY ABORTED.
781 */
782 sense_rc = TCM_COPY_TARGET_DEVICE_NOT_REACHABLE;
783 xcopy_pt_undepend_remotedev(xop);
784 target_free_sgl(xop->xop_data_sg, xop->xop_data_nents);
785
786err_free:
787 kfree(xop);
788 pr_warn_ratelimited("%s: rc: %d, sense: %u, XCOPY operation failed\n",
789 __func__, rc, sense_rc);
790 target_complete_cmd_with_sense(ec_cmd, SAM_STAT_CHECK_CONDITION, sense_rc);
791}
792
793/*
794 * Returns TCM_NO_SENSE upon success or a sense code != TCM_NO_SENSE if parsing
795 * fails.
796 */
797static sense_reason_t target_parse_xcopy_cmd(struct xcopy_op *xop)
798{
799 struct se_cmd *se_cmd = xop->xop_se_cmd;
800 unsigned char *p = NULL, *seg_desc;
801 unsigned int list_id, list_id_usage, sdll, inline_dl;
802 sense_reason_t ret = TCM_INVALID_PARAMETER_LIST;
803 int rc;
804 unsigned short tdll;
805
806 p = transport_kmap_data_sg(se_cmd);
807 if (!p) {
808 pr_err("transport_kmap_data_sg() failed in target_do_xcopy\n");
809 return TCM_OUT_OF_RESOURCES;
810 }
811
812 list_id = p[0];
813 list_id_usage = (p[1] & 0x18) >> 3;
814
815 /*
816 * Determine TARGET DESCRIPTOR LIST LENGTH + SEGMENT DESCRIPTOR LIST LENGTH
817 */
818 tdll = get_unaligned_be16(&p[2]);
819 sdll = get_unaligned_be32(&p[8]);
820 if (tdll + sdll > RCR_OP_MAX_DESC_LIST_LEN) {
821 pr_err("XCOPY descriptor list length %u exceeds maximum %u\n",
822 tdll + sdll, RCR_OP_MAX_DESC_LIST_LEN);
823 ret = TCM_PARAMETER_LIST_LENGTH_ERROR;
824 goto out;
825 }
826
827 inline_dl = get_unaligned_be32(&p[12]);
828 if (inline_dl != 0) {
829 pr_err("XCOPY with non zero inline data length\n");
830 goto out;
831 }
832
833 if (se_cmd->data_length < (XCOPY_HDR_LEN + tdll + sdll + inline_dl)) {
834 pr_err("XCOPY parameter truncation: data length %u too small "
835 "for tdll: %hu sdll: %u inline_dl: %u\n",
836 se_cmd->data_length, tdll, sdll, inline_dl);
837 ret = TCM_PARAMETER_LIST_LENGTH_ERROR;
838 goto out;
839 }
840
841 pr_debug("Processing XCOPY with list_id: 0x%02x list_id_usage: 0x%02x"
842 " tdll: %hu sdll: %u inline_dl: %u\n", list_id, list_id_usage,
843 tdll, sdll, inline_dl);
844
845 /*
846 * skip over the target descriptors until segment descriptors
847 * have been passed - CSCD ids are needed to determine src and dest.
848 */
849 seg_desc = &p[16] + tdll;
850
851 rc = target_xcopy_parse_segment_descriptors(xop, seg_desc, sdll, &ret);
852 if (rc <= 0)
853 goto out;
854
855 pr_debug("XCOPY: Processed %d segment descriptors, length: %u\n", rc,
856 rc * XCOPY_SEGMENT_DESC_LEN);
857
858 rc = target_xcopy_parse_target_descriptors(se_cmd, xop, &p[16], tdll, &ret);
859 if (rc <= 0)
860 goto out;
861
862 if (xop->src_dev->dev_attrib.block_size !=
863 xop->dst_dev->dev_attrib.block_size) {
864 pr_err("XCOPY: Non matching src_dev block_size: %u + dst_dev"
865 " block_size: %u currently unsupported\n",
866 xop->src_dev->dev_attrib.block_size,
867 xop->dst_dev->dev_attrib.block_size);
868 xcopy_pt_undepend_remotedev(xop);
869 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
870 goto out;
871 }
872
873 pr_debug("XCOPY: Processed %d target descriptors, length: %u\n", rc,
874 rc * XCOPY_TARGET_DESC_LEN);
875 transport_kunmap_data_sg(se_cmd);
876 return TCM_NO_SENSE;
877
878out:
879 if (p)
880 transport_kunmap_data_sg(se_cmd);
881 return ret;
882}
883
884sense_reason_t target_do_xcopy(struct se_cmd *se_cmd)
885{
886 struct se_device *dev = se_cmd->se_dev;
887 struct xcopy_op *xop;
888 unsigned int sa;
889
890 if (!dev->dev_attrib.emulate_3pc) {
891 pr_err("EXTENDED_COPY operation explicitly disabled\n");
892 return TCM_UNSUPPORTED_SCSI_OPCODE;
893 }
894
895 sa = se_cmd->t_task_cdb[1] & 0x1f;
896 if (sa != 0x00) {
897 pr_err("EXTENDED_COPY(LID4) not supported\n");
898 return TCM_UNSUPPORTED_SCSI_OPCODE;
899 }
900
901 if (se_cmd->data_length == 0) {
902 target_complete_cmd(se_cmd, SAM_STAT_GOOD);
903 return TCM_NO_SENSE;
904 }
905 if (se_cmd->data_length < XCOPY_HDR_LEN) {
906 pr_err("XCOPY parameter truncation: length %u < hdr_len %u\n",
907 se_cmd->data_length, XCOPY_HDR_LEN);
908 return TCM_PARAMETER_LIST_LENGTH_ERROR;
909 }
910
911 xop = kzalloc(sizeof(struct xcopy_op), GFP_KERNEL);
912 if (!xop)
913 goto err;
914 xop->xop_se_cmd = se_cmd;
915 INIT_WORK(&xop->xop_work, target_xcopy_do_work);
916 if (WARN_ON_ONCE(!queue_work(xcopy_wq, &xop->xop_work)))
917 goto free;
918 return TCM_NO_SENSE;
919
920free:
921 kfree(xop);
922
923err:
924 return TCM_OUT_OF_RESOURCES;
925}
926
927static sense_reason_t target_rcr_operating_parameters(struct se_cmd *se_cmd)
928{
929 unsigned char *p;
930
931 p = transport_kmap_data_sg(se_cmd);
932 if (!p) {
933 pr_err("transport_kmap_data_sg failed in"
934 " target_rcr_operating_parameters\n");
935 return TCM_OUT_OF_RESOURCES;
936 }
937
938 if (se_cmd->data_length < 54) {
939 pr_err("Receive Copy Results Op Parameters length"
940 " too small: %u\n", se_cmd->data_length);
941 transport_kunmap_data_sg(se_cmd);
942 return TCM_INVALID_CDB_FIELD;
943 }
944 /*
945 * Set SNLID=1 (Supports no List ID)
946 */
947 p[4] = 0x1;
948 /*
949 * MAXIMUM TARGET DESCRIPTOR COUNT
950 */
951 put_unaligned_be16(RCR_OP_MAX_TARGET_DESC_COUNT, &p[8]);
952 /*
953 * MAXIMUM SEGMENT DESCRIPTOR COUNT
954 */
955 put_unaligned_be16(RCR_OP_MAX_SG_DESC_COUNT, &p[10]);
956 /*
957 * MAXIMUM DESCRIPTOR LIST LENGTH
958 */
959 put_unaligned_be32(RCR_OP_MAX_DESC_LIST_LEN, &p[12]);
960 /*
961 * MAXIMUM SEGMENT LENGTH
962 */
963 put_unaligned_be32(RCR_OP_MAX_SEGMENT_LEN, &p[16]);
964 /*
965 * MAXIMUM INLINE DATA LENGTH for SA 0x04 (NOT SUPPORTED)
966 */
967 put_unaligned_be32(0x0, &p[20]);
968 /*
969 * HELD DATA LIMIT
970 */
971 put_unaligned_be32(0x0, &p[24]);
972 /*
973 * MAXIMUM STREAM DEVICE TRANSFER SIZE
974 */
975 put_unaligned_be32(0x0, &p[28]);
976 /*
977 * TOTAL CONCURRENT COPIES
978 */
979 put_unaligned_be16(RCR_OP_TOTAL_CONCURR_COPIES, &p[34]);
980 /*
981 * MAXIMUM CONCURRENT COPIES
982 */
983 p[36] = RCR_OP_MAX_CONCURR_COPIES;
984 /*
985 * DATA SEGMENT GRANULARITY (log 2)
986 */
987 p[37] = RCR_OP_DATA_SEG_GRAN_LOG2;
988 /*
989 * INLINE DATA GRANULARITY log 2)
990 */
991 p[38] = RCR_OP_INLINE_DATA_GRAN_LOG2;
992 /*
993 * HELD DATA GRANULARITY
994 */
995 p[39] = RCR_OP_HELD_DATA_GRAN_LOG2;
996 /*
997 * IMPLEMENTED DESCRIPTOR LIST LENGTH
998 */
999 p[43] = 0x2;
1000 /*
1001 * List of implemented descriptor type codes (ordered)
1002 */
1003 p[44] = 0x02; /* Copy Block to Block device */
1004 p[45] = 0xe4; /* Identification descriptor target descriptor */
1005
1006 /*
1007 * AVAILABLE DATA (n-3)
1008 */
1009 put_unaligned_be32(42, &p[0]);
1010
1011 transport_kunmap_data_sg(se_cmd);
1012 target_complete_cmd(se_cmd, SAM_STAT_GOOD);
1013
1014 return TCM_NO_SENSE;
1015}
1016
1017sense_reason_t target_do_receive_copy_results(struct se_cmd *se_cmd)
1018{
1019 unsigned char *cdb = &se_cmd->t_task_cdb[0];
1020 int sa = (cdb[1] & 0x1f), list_id = cdb[2];
1021 struct se_device *dev = se_cmd->se_dev;
1022 sense_reason_t rc = TCM_NO_SENSE;
1023
1024 if (!dev->dev_attrib.emulate_3pc) {
1025 pr_debug("Third-party copy operations explicitly disabled\n");
1026 return TCM_UNSUPPORTED_SCSI_OPCODE;
1027 }
1028
1029 pr_debug("Entering target_do_receive_copy_results: SA: 0x%02x, List ID:"
1030 " 0x%02x, AL: %u\n", sa, list_id, se_cmd->data_length);
1031
1032 if (list_id != 0) {
1033 pr_err("Receive Copy Results with non zero list identifier"
1034 " not supported\n");
1035 return TCM_INVALID_CDB_FIELD;
1036 }
1037
1038 switch (sa) {
1039 case RCR_SA_OPERATING_PARAMETERS:
1040 rc = target_rcr_operating_parameters(se_cmd);
1041 break;
1042 case RCR_SA_COPY_STATUS:
1043 case RCR_SA_RECEIVE_DATA:
1044 case RCR_SA_FAILED_SEGMENT_DETAILS:
1045 default:
1046 pr_err("Unsupported SA for receive copy results: 0x%02x\n", sa);
1047 return TCM_INVALID_CDB_FIELD;
1048 }
1049
1050 return rc;
1051}
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 <scsi/scsi.h>
29#include <scsi/scsi_cmnd.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#include <target/target_core_configfs.h>
36
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/*
43 * From target_core_device.c
44 */
45extern struct mutex g_device_mutex;
46extern struct list_head g_device_list;
47/*
48 * From target_core_configfs.c
49 */
50extern struct configfs_subsystem *target_core_subsystem[];
51
52static int target_xcopy_gen_naa_ieee(struct se_device *dev, unsigned char *buf)
53{
54 int off = 0;
55
56 buf[off++] = (0x6 << 4);
57 buf[off++] = 0x01;
58 buf[off++] = 0x40;
59 buf[off] = (0x5 << 4);
60
61 spc_parse_naa_6h_vendor_specific(dev, &buf[off]);
62 return 0;
63}
64
65static int target_xcopy_locate_se_dev_e4(struct se_cmd *se_cmd, struct xcopy_op *xop,
66 bool src)
67{
68 struct se_device *se_dev;
69 struct configfs_subsystem *subsys = target_core_subsystem[0];
70 unsigned char tmp_dev_wwn[XCOPY_NAA_IEEE_REGEX_LEN], *dev_wwn;
71 int rc;
72
73 if (src == true)
74 dev_wwn = &xop->dst_tid_wwn[0];
75 else
76 dev_wwn = &xop->src_tid_wwn[0];
77
78 mutex_lock(&g_device_mutex);
79 list_for_each_entry(se_dev, &g_device_list, g_dev_node) {
80
81 if (!se_dev->dev_attrib.emulate_3pc)
82 continue;
83
84 memset(&tmp_dev_wwn[0], 0, XCOPY_NAA_IEEE_REGEX_LEN);
85 target_xcopy_gen_naa_ieee(se_dev, &tmp_dev_wwn[0]);
86
87 rc = memcmp(&tmp_dev_wwn[0], dev_wwn, XCOPY_NAA_IEEE_REGEX_LEN);
88 if (rc != 0)
89 continue;
90
91 if (src == true) {
92 xop->dst_dev = se_dev;
93 pr_debug("XCOPY 0xe4: Setting xop->dst_dev: %p from located"
94 " se_dev\n", xop->dst_dev);
95 } else {
96 xop->src_dev = se_dev;
97 pr_debug("XCOPY 0xe4: Setting xop->src_dev: %p from located"
98 " se_dev\n", xop->src_dev);
99 }
100
101 rc = configfs_depend_item(subsys,
102 &se_dev->dev_group.cg_item);
103 if (rc != 0) {
104 pr_err("configfs_depend_item attempt failed:"
105 " %d for se_dev: %p\n", rc, se_dev);
106 mutex_unlock(&g_device_mutex);
107 return rc;
108 }
109
110 pr_debug("Called configfs_depend_item for subsys: %p se_dev: %p"
111 " se_dev->se_dev_group: %p\n", subsys, se_dev,
112 &se_dev->dev_group);
113
114 mutex_unlock(&g_device_mutex);
115 return 0;
116 }
117 mutex_unlock(&g_device_mutex);
118
119 pr_err("Unable to locate 0xe4 descriptor for EXTENDED_COPY\n");
120 return -EINVAL;
121}
122
123static int target_xcopy_parse_tiddesc_e4(struct se_cmd *se_cmd, struct xcopy_op *xop,
124 unsigned char *p, bool src)
125{
126 unsigned char *desc = p;
127 unsigned short ript;
128 u8 desig_len;
129 /*
130 * Extract RELATIVE INITIATOR PORT IDENTIFIER
131 */
132 ript = get_unaligned_be16(&desc[2]);
133 pr_debug("XCOPY 0xe4: RELATIVE INITIATOR PORT IDENTIFIER: %hu\n", ript);
134 /*
135 * Check for supported code set, association, and designator type
136 */
137 if ((desc[4] & 0x0f) != 0x1) {
138 pr_err("XCOPY 0xe4: code set of non binary type not supported\n");
139 return -EINVAL;
140 }
141 if ((desc[5] & 0x30) != 0x00) {
142 pr_err("XCOPY 0xe4: association other than LUN not supported\n");
143 return -EINVAL;
144 }
145 if ((desc[5] & 0x0f) != 0x3) {
146 pr_err("XCOPY 0xe4: designator type unsupported: 0x%02x\n",
147 (desc[5] & 0x0f));
148 return -EINVAL;
149 }
150 /*
151 * Check for matching 16 byte length for NAA IEEE Registered Extended
152 * Assigned designator
153 */
154 desig_len = desc[7];
155 if (desig_len != 16) {
156 pr_err("XCOPY 0xe4: invalid desig_len: %d\n", (int)desig_len);
157 return -EINVAL;
158 }
159 pr_debug("XCOPY 0xe4: desig_len: %d\n", (int)desig_len);
160 /*
161 * Check for NAA IEEE Registered Extended Assigned header..
162 */
163 if ((desc[8] & 0xf0) != 0x60) {
164 pr_err("XCOPY 0xe4: Unsupported DESIGNATOR TYPE: 0x%02x\n",
165 (desc[8] & 0xf0));
166 return -EINVAL;
167 }
168
169 if (src == true) {
170 memcpy(&xop->src_tid_wwn[0], &desc[8], XCOPY_NAA_IEEE_REGEX_LEN);
171 /*
172 * Determine if the source designator matches the local device
173 */
174 if (!memcmp(&xop->local_dev_wwn[0], &xop->src_tid_wwn[0],
175 XCOPY_NAA_IEEE_REGEX_LEN)) {
176 xop->op_origin = XCOL_SOURCE_RECV_OP;
177 xop->src_dev = se_cmd->se_dev;
178 pr_debug("XCOPY 0xe4: Set xop->src_dev %p from source"
179 " received xop\n", xop->src_dev);
180 }
181 } else {
182 memcpy(&xop->dst_tid_wwn[0], &desc[8], XCOPY_NAA_IEEE_REGEX_LEN);
183 /*
184 * Determine if the destination designator matches the local device
185 */
186 if (!memcmp(&xop->local_dev_wwn[0], &xop->dst_tid_wwn[0],
187 XCOPY_NAA_IEEE_REGEX_LEN)) {
188 xop->op_origin = XCOL_DEST_RECV_OP;
189 xop->dst_dev = se_cmd->se_dev;
190 pr_debug("XCOPY 0xe4: Set xop->dst_dev: %p from destination"
191 " received xop\n", xop->dst_dev);
192 }
193 }
194
195 return 0;
196}
197
198static int target_xcopy_parse_target_descriptors(struct se_cmd *se_cmd,
199 struct xcopy_op *xop, unsigned char *p,
200 unsigned short tdll)
201{
202 struct se_device *local_dev = se_cmd->se_dev;
203 unsigned char *desc = p;
204 int offset = tdll % XCOPY_TARGET_DESC_LEN, rc, ret = 0;
205 unsigned short start = 0;
206 bool src = true;
207
208 if (offset != 0) {
209 pr_err("XCOPY target descriptor list length is not"
210 " multiple of %d\n", XCOPY_TARGET_DESC_LEN);
211 return -EINVAL;
212 }
213 if (tdll > 64) {
214 pr_err("XCOPY target descriptor supports a maximum"
215 " two src/dest descriptors, tdll: %hu too large..\n", tdll);
216 return -EINVAL;
217 }
218 /*
219 * Generate an IEEE Registered Extended designator based upon the
220 * se_device the XCOPY was received upon..
221 */
222 memset(&xop->local_dev_wwn[0], 0, XCOPY_NAA_IEEE_REGEX_LEN);
223 target_xcopy_gen_naa_ieee(local_dev, &xop->local_dev_wwn[0]);
224
225 while (start < tdll) {
226 /*
227 * Check target descriptor identification with 0xE4 type with
228 * use VPD 0x83 WWPN matching ..
229 */
230 switch (desc[0]) {
231 case 0xe4:
232 rc = target_xcopy_parse_tiddesc_e4(se_cmd, xop,
233 &desc[0], src);
234 if (rc != 0)
235 goto out;
236 /*
237 * Assume target descriptors are in source -> destination order..
238 */
239 if (src == true)
240 src = false;
241 else
242 src = true;
243 start += XCOPY_TARGET_DESC_LEN;
244 desc += XCOPY_TARGET_DESC_LEN;
245 ret++;
246 break;
247 default:
248 pr_err("XCOPY unsupported descriptor type code:"
249 " 0x%02x\n", desc[0]);
250 goto out;
251 }
252 }
253
254 if (xop->op_origin == XCOL_SOURCE_RECV_OP)
255 rc = target_xcopy_locate_se_dev_e4(se_cmd, xop, true);
256 else
257 rc = target_xcopy_locate_se_dev_e4(se_cmd, xop, false);
258
259 if (rc < 0)
260 goto out;
261
262 pr_debug("XCOPY TGT desc: Source dev: %p NAA IEEE WWN: 0x%16phN\n",
263 xop->src_dev, &xop->src_tid_wwn[0]);
264 pr_debug("XCOPY TGT desc: Dest dev: %p NAA IEEE WWN: 0x%16phN\n",
265 xop->dst_dev, &xop->dst_tid_wwn[0]);
266
267 return ret;
268
269out:
270 return -EINVAL;
271}
272
273static int target_xcopy_parse_segdesc_02(struct se_cmd *se_cmd, struct xcopy_op *xop,
274 unsigned char *p)
275{
276 unsigned char *desc = p;
277 int dc = (desc[1] & 0x02);
278 unsigned short desc_len;
279
280 desc_len = get_unaligned_be16(&desc[2]);
281 if (desc_len != 0x18) {
282 pr_err("XCOPY segment desc 0x02: Illegal desc_len:"
283 " %hu\n", desc_len);
284 return -EINVAL;
285 }
286
287 xop->stdi = get_unaligned_be16(&desc[4]);
288 xop->dtdi = get_unaligned_be16(&desc[6]);
289 pr_debug("XCOPY seg desc 0x02: desc_len: %hu stdi: %hu dtdi: %hu, DC: %d\n",
290 desc_len, xop->stdi, xop->dtdi, dc);
291
292 xop->nolb = get_unaligned_be16(&desc[10]);
293 xop->src_lba = get_unaligned_be64(&desc[12]);
294 xop->dst_lba = get_unaligned_be64(&desc[20]);
295 pr_debug("XCOPY seg desc 0x02: nolb: %hu src_lba: %llu dst_lba: %llu\n",
296 xop->nolb, (unsigned long long)xop->src_lba,
297 (unsigned long long)xop->dst_lba);
298
299 if (dc != 0) {
300 xop->dbl = (desc[29] & 0xff) << 16;
301 xop->dbl |= (desc[30] & 0xff) << 8;
302 xop->dbl |= desc[31] & 0xff;
303
304 pr_debug("XCOPY seg desc 0x02: DC=1 w/ dbl: %u\n", xop->dbl);
305 }
306 return 0;
307}
308
309static int target_xcopy_parse_segment_descriptors(struct se_cmd *se_cmd,
310 struct xcopy_op *xop, unsigned char *p,
311 unsigned int sdll)
312{
313 unsigned char *desc = p;
314 unsigned int start = 0;
315 int offset = sdll % XCOPY_SEGMENT_DESC_LEN, rc, ret = 0;
316
317 if (offset != 0) {
318 pr_err("XCOPY segment descriptor list length is not"
319 " multiple of %d\n", XCOPY_SEGMENT_DESC_LEN);
320 return -EINVAL;
321 }
322
323 while (start < sdll) {
324 /*
325 * Check segment descriptor type code for block -> block
326 */
327 switch (desc[0]) {
328 case 0x02:
329 rc = target_xcopy_parse_segdesc_02(se_cmd, xop, desc);
330 if (rc < 0)
331 goto out;
332
333 ret++;
334 start += XCOPY_SEGMENT_DESC_LEN;
335 desc += XCOPY_SEGMENT_DESC_LEN;
336 break;
337 default:
338 pr_err("XCOPY unspported segment descriptor"
339 "type: 0x%02x\n", desc[0]);
340 goto out;
341 }
342 }
343
344 return ret;
345
346out:
347 return -EINVAL;
348}
349
350/*
351 * Start xcopy_pt ops
352 */
353
354struct xcopy_pt_cmd {
355 bool remote_port;
356 struct se_cmd se_cmd;
357 struct xcopy_op *xcopy_op;
358 struct completion xpt_passthrough_sem;
359 unsigned char sense_buffer[TRANSPORT_SENSE_BUFFER];
360};
361
362static struct se_port xcopy_pt_port;
363static struct se_portal_group xcopy_pt_tpg;
364static struct se_session xcopy_pt_sess;
365static struct se_node_acl xcopy_pt_nacl;
366
367static char *xcopy_pt_get_fabric_name(void)
368{
369 return "xcopy-pt";
370}
371
372static u32 xcopy_pt_get_tag(struct se_cmd *se_cmd)
373{
374 return 0;
375}
376
377static int xcopy_pt_get_cmd_state(struct se_cmd *se_cmd)
378{
379 return 0;
380}
381
382static void xcopy_pt_undepend_remotedev(struct xcopy_op *xop)
383{
384 struct configfs_subsystem *subsys = target_core_subsystem[0];
385 struct se_device *remote_dev;
386
387 if (xop->op_origin == XCOL_SOURCE_RECV_OP)
388 remote_dev = xop->dst_dev;
389 else
390 remote_dev = xop->src_dev;
391
392 pr_debug("Calling configfs_undepend_item for subsys: %p"
393 " remote_dev: %p remote_dev->dev_group: %p\n",
394 subsys, remote_dev, &remote_dev->dev_group.cg_item);
395
396 configfs_undepend_item(subsys, &remote_dev->dev_group.cg_item);
397}
398
399static void xcopy_pt_release_cmd(struct se_cmd *se_cmd)
400{
401 struct xcopy_pt_cmd *xpt_cmd = container_of(se_cmd,
402 struct xcopy_pt_cmd, se_cmd);
403
404 kfree(xpt_cmd);
405}
406
407static int xcopy_pt_check_stop_free(struct se_cmd *se_cmd)
408{
409 struct xcopy_pt_cmd *xpt_cmd = container_of(se_cmd,
410 struct xcopy_pt_cmd, se_cmd);
411
412 complete(&xpt_cmd->xpt_passthrough_sem);
413 return 0;
414}
415
416static int xcopy_pt_write_pending(struct se_cmd *se_cmd)
417{
418 return 0;
419}
420
421static int xcopy_pt_write_pending_status(struct se_cmd *se_cmd)
422{
423 return 0;
424}
425
426static int xcopy_pt_queue_data_in(struct se_cmd *se_cmd)
427{
428 return 0;
429}
430
431static int xcopy_pt_queue_status(struct se_cmd *se_cmd)
432{
433 return 0;
434}
435
436static struct target_core_fabric_ops xcopy_pt_tfo = {
437 .get_fabric_name = xcopy_pt_get_fabric_name,
438 .get_task_tag = xcopy_pt_get_tag,
439 .get_cmd_state = xcopy_pt_get_cmd_state,
440 .release_cmd = xcopy_pt_release_cmd,
441 .check_stop_free = xcopy_pt_check_stop_free,
442 .write_pending = xcopy_pt_write_pending,
443 .write_pending_status = xcopy_pt_write_pending_status,
444 .queue_data_in = xcopy_pt_queue_data_in,
445 .queue_status = xcopy_pt_queue_status,
446};
447
448/*
449 * End xcopy_pt_ops
450 */
451
452int target_xcopy_setup_pt(void)
453{
454 xcopy_wq = alloc_workqueue("xcopy_wq", WQ_MEM_RECLAIM, 0);
455 if (!xcopy_wq) {
456 pr_err("Unable to allocate xcopy_wq\n");
457 return -ENOMEM;
458 }
459
460 memset(&xcopy_pt_port, 0, sizeof(struct se_port));
461 INIT_LIST_HEAD(&xcopy_pt_port.sep_alua_list);
462 INIT_LIST_HEAD(&xcopy_pt_port.sep_list);
463 mutex_init(&xcopy_pt_port.sep_tg_pt_md_mutex);
464
465 memset(&xcopy_pt_tpg, 0, sizeof(struct se_portal_group));
466 INIT_LIST_HEAD(&xcopy_pt_tpg.se_tpg_node);
467 INIT_LIST_HEAD(&xcopy_pt_tpg.acl_node_list);
468 INIT_LIST_HEAD(&xcopy_pt_tpg.tpg_sess_list);
469
470 xcopy_pt_port.sep_tpg = &xcopy_pt_tpg;
471 xcopy_pt_tpg.se_tpg_tfo = &xcopy_pt_tfo;
472
473 memset(&xcopy_pt_nacl, 0, sizeof(struct se_node_acl));
474 INIT_LIST_HEAD(&xcopy_pt_nacl.acl_list);
475 INIT_LIST_HEAD(&xcopy_pt_nacl.acl_sess_list);
476 memset(&xcopy_pt_sess, 0, sizeof(struct se_session));
477 INIT_LIST_HEAD(&xcopy_pt_sess.sess_list);
478 INIT_LIST_HEAD(&xcopy_pt_sess.sess_acl_list);
479
480 xcopy_pt_nacl.se_tpg = &xcopy_pt_tpg;
481 xcopy_pt_nacl.nacl_sess = &xcopy_pt_sess;
482
483 xcopy_pt_sess.se_tpg = &xcopy_pt_tpg;
484 xcopy_pt_sess.se_node_acl = &xcopy_pt_nacl;
485
486 return 0;
487}
488
489void target_xcopy_release_pt(void)
490{
491 if (xcopy_wq)
492 destroy_workqueue(xcopy_wq);
493}
494
495static void target_xcopy_setup_pt_port(
496 struct xcopy_pt_cmd *xpt_cmd,
497 struct xcopy_op *xop,
498 bool remote_port)
499{
500 struct se_cmd *ec_cmd = xop->xop_se_cmd;
501 struct se_cmd *pt_cmd = &xpt_cmd->se_cmd;
502
503 if (xop->op_origin == XCOL_SOURCE_RECV_OP) {
504 /*
505 * Honor destination port reservations for X-COPY PUSH emulation
506 * when CDB is received on local source port, and READs blocks to
507 * WRITE on remote destination port.
508 */
509 if (remote_port) {
510 xpt_cmd->remote_port = remote_port;
511 pt_cmd->se_lun->lun_sep = &xcopy_pt_port;
512 pr_debug("Setup emulated remote DEST xcopy_pt_port: %p to"
513 " cmd->se_lun->lun_sep for X-COPY data PUSH\n",
514 pt_cmd->se_lun->lun_sep);
515 } else {
516 pt_cmd->se_lun = ec_cmd->se_lun;
517 pt_cmd->se_dev = ec_cmd->se_dev;
518
519 pr_debug("Honoring local SRC port from ec_cmd->se_dev:"
520 " %p\n", pt_cmd->se_dev);
521 pt_cmd->se_lun = ec_cmd->se_lun;
522 pr_debug("Honoring local SRC port from ec_cmd->se_lun: %p\n",
523 pt_cmd->se_lun);
524 }
525 } else {
526 /*
527 * Honor source port reservation for X-COPY PULL emulation
528 * when CDB is received on local desintation port, and READs
529 * blocks from the remote source port to WRITE on local
530 * destination port.
531 */
532 if (remote_port) {
533 xpt_cmd->remote_port = remote_port;
534 pt_cmd->se_lun->lun_sep = &xcopy_pt_port;
535 pr_debug("Setup emulated remote SRC xcopy_pt_port: %p to"
536 " cmd->se_lun->lun_sep for X-COPY data PULL\n",
537 pt_cmd->se_lun->lun_sep);
538 } else {
539 pt_cmd->se_lun = ec_cmd->se_lun;
540 pt_cmd->se_dev = ec_cmd->se_dev;
541
542 pr_debug("Honoring local DST port from ec_cmd->se_dev:"
543 " %p\n", pt_cmd->se_dev);
544 pt_cmd->se_lun = ec_cmd->se_lun;
545 pr_debug("Honoring local DST port from ec_cmd->se_lun: %p\n",
546 pt_cmd->se_lun);
547 }
548 }
549}
550
551static int target_xcopy_init_pt_lun(
552 struct xcopy_pt_cmd *xpt_cmd,
553 struct xcopy_op *xop,
554 struct se_device *se_dev,
555 struct se_cmd *pt_cmd,
556 bool remote_port)
557{
558 /*
559 * Don't allocate + init an pt_cmd->se_lun if honoring local port for
560 * reservations. The pt_cmd->se_lun pointer will be setup from within
561 * target_xcopy_setup_pt_port()
562 */
563 if (remote_port == false) {
564 pt_cmd->se_cmd_flags |= SCF_SE_LUN_CMD | SCF_CMD_XCOPY_PASSTHROUGH;
565 return 0;
566 }
567
568 pt_cmd->se_lun = &se_dev->xcopy_lun;
569 pt_cmd->se_dev = se_dev;
570
571 pr_debug("Setup emulated se_dev: %p from se_dev\n", pt_cmd->se_dev);
572 pt_cmd->se_cmd_flags |= SCF_SE_LUN_CMD | SCF_CMD_XCOPY_PASSTHROUGH;
573
574 pr_debug("Setup emulated se_dev: %p to pt_cmd->se_lun->lun_se_dev\n",
575 pt_cmd->se_lun->lun_se_dev);
576
577 return 0;
578}
579
580static int target_xcopy_setup_pt_cmd(
581 struct xcopy_pt_cmd *xpt_cmd,
582 struct xcopy_op *xop,
583 struct se_device *se_dev,
584 unsigned char *cdb,
585 bool remote_port,
586 bool alloc_mem)
587{
588 struct se_cmd *cmd = &xpt_cmd->se_cmd;
589 sense_reason_t sense_rc;
590 int ret = 0, rc;
591 /*
592 * Setup LUN+port to honor reservations based upon xop->op_origin for
593 * X-COPY PUSH or X-COPY PULL based upon where the CDB was received.
594 */
595 rc = target_xcopy_init_pt_lun(xpt_cmd, xop, se_dev, cmd, remote_port);
596 if (rc < 0) {
597 ret = rc;
598 goto out;
599 }
600 xpt_cmd->xcopy_op = xop;
601 target_xcopy_setup_pt_port(xpt_cmd, xop, remote_port);
602
603 sense_rc = target_setup_cmd_from_cdb(cmd, cdb);
604 if (sense_rc) {
605 ret = -EINVAL;
606 goto out;
607 }
608
609 if (alloc_mem) {
610 rc = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents,
611 cmd->data_length, false);
612 if (rc < 0) {
613 ret = rc;
614 goto out;
615 }
616 /*
617 * Set this bit so that transport_free_pages() allows the
618 * caller to release SGLs + physical memory allocated by
619 * transport_generic_get_mem()..
620 */
621 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
622 } else {
623 /*
624 * Here the previously allocated SGLs for the internal READ
625 * are mapped zero-copy to the internal WRITE.
626 */
627 sense_rc = transport_generic_map_mem_to_cmd(cmd,
628 xop->xop_data_sg, xop->xop_data_nents,
629 NULL, 0);
630 if (sense_rc) {
631 ret = -EINVAL;
632 goto out;
633 }
634
635 pr_debug("Setup PASSTHROUGH_NOALLOC t_data_sg: %p t_data_nents:"
636 " %u\n", cmd->t_data_sg, cmd->t_data_nents);
637 }
638
639 return 0;
640
641out:
642 return ret;
643}
644
645static int target_xcopy_issue_pt_cmd(struct xcopy_pt_cmd *xpt_cmd)
646{
647 struct se_cmd *se_cmd = &xpt_cmd->se_cmd;
648 sense_reason_t sense_rc;
649
650 sense_rc = transport_generic_new_cmd(se_cmd);
651 if (sense_rc)
652 return -EINVAL;
653
654 if (se_cmd->data_direction == DMA_TO_DEVICE)
655 target_execute_cmd(se_cmd);
656
657 wait_for_completion_interruptible(&xpt_cmd->xpt_passthrough_sem);
658
659 pr_debug("target_xcopy_issue_pt_cmd(): SCSI status: 0x%02x\n",
660 se_cmd->scsi_status);
661
662 return (se_cmd->scsi_status) ? -EINVAL : 0;
663}
664
665static int target_xcopy_read_source(
666 struct se_cmd *ec_cmd,
667 struct xcopy_op *xop,
668 struct se_device *src_dev,
669 sector_t src_lba,
670 u32 src_sectors)
671{
672 struct xcopy_pt_cmd *xpt_cmd;
673 struct se_cmd *se_cmd;
674 u32 length = (src_sectors * src_dev->dev_attrib.block_size);
675 int rc;
676 unsigned char cdb[16];
677 bool remote_port = (xop->op_origin == XCOL_DEST_RECV_OP);
678
679 xpt_cmd = kzalloc(sizeof(struct xcopy_pt_cmd), GFP_KERNEL);
680 if (!xpt_cmd) {
681 pr_err("Unable to allocate xcopy_pt_cmd\n");
682 return -ENOMEM;
683 }
684 init_completion(&xpt_cmd->xpt_passthrough_sem);
685 se_cmd = &xpt_cmd->se_cmd;
686
687 memset(&cdb[0], 0, 16);
688 cdb[0] = READ_16;
689 put_unaligned_be64(src_lba, &cdb[2]);
690 put_unaligned_be32(src_sectors, &cdb[10]);
691 pr_debug("XCOPY: Built READ_16: LBA: %llu Sectors: %u Length: %u\n",
692 (unsigned long long)src_lba, src_sectors, length);
693
694 transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, NULL, length,
695 DMA_FROM_DEVICE, 0, &xpt_cmd->sense_buffer[0]);
696 xop->src_pt_cmd = xpt_cmd;
697
698 rc = target_xcopy_setup_pt_cmd(xpt_cmd, xop, src_dev, &cdb[0],
699 remote_port, true);
700 if (rc < 0) {
701 transport_generic_free_cmd(se_cmd, 0);
702 return rc;
703 }
704
705 xop->xop_data_sg = se_cmd->t_data_sg;
706 xop->xop_data_nents = se_cmd->t_data_nents;
707 pr_debug("XCOPY-READ: Saved xop->xop_data_sg: %p, num: %u for READ"
708 " memory\n", xop->xop_data_sg, xop->xop_data_nents);
709
710 rc = target_xcopy_issue_pt_cmd(xpt_cmd);
711 if (rc < 0) {
712 transport_generic_free_cmd(se_cmd, 0);
713 return rc;
714 }
715 /*
716 * Clear off the allocated t_data_sg, that has been saved for
717 * zero-copy WRITE submission reuse in struct xcopy_op..
718 */
719 se_cmd->t_data_sg = NULL;
720 se_cmd->t_data_nents = 0;
721
722 return 0;
723}
724
725static int target_xcopy_write_destination(
726 struct se_cmd *ec_cmd,
727 struct xcopy_op *xop,
728 struct se_device *dst_dev,
729 sector_t dst_lba,
730 u32 dst_sectors)
731{
732 struct xcopy_pt_cmd *xpt_cmd;
733 struct se_cmd *se_cmd;
734 u32 length = (dst_sectors * dst_dev->dev_attrib.block_size);
735 int rc;
736 unsigned char cdb[16];
737 bool remote_port = (xop->op_origin == XCOL_SOURCE_RECV_OP);
738
739 xpt_cmd = kzalloc(sizeof(struct xcopy_pt_cmd), GFP_KERNEL);
740 if (!xpt_cmd) {
741 pr_err("Unable to allocate xcopy_pt_cmd\n");
742 return -ENOMEM;
743 }
744 init_completion(&xpt_cmd->xpt_passthrough_sem);
745 se_cmd = &xpt_cmd->se_cmd;
746
747 memset(&cdb[0], 0, 16);
748 cdb[0] = WRITE_16;
749 put_unaligned_be64(dst_lba, &cdb[2]);
750 put_unaligned_be32(dst_sectors, &cdb[10]);
751 pr_debug("XCOPY: Built WRITE_16: LBA: %llu Sectors: %u Length: %u\n",
752 (unsigned long long)dst_lba, dst_sectors, length);
753
754 transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, NULL, length,
755 DMA_TO_DEVICE, 0, &xpt_cmd->sense_buffer[0]);
756 xop->dst_pt_cmd = xpt_cmd;
757
758 rc = target_xcopy_setup_pt_cmd(xpt_cmd, xop, dst_dev, &cdb[0],
759 remote_port, false);
760 if (rc < 0) {
761 struct se_cmd *src_cmd = &xop->src_pt_cmd->se_cmd;
762 /*
763 * If the failure happened before the t_mem_list hand-off in
764 * target_xcopy_setup_pt_cmd(), Reset memory + clear flag so that
765 * core releases this memory on error during X-COPY WRITE I/O.
766 */
767 src_cmd->se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
768 src_cmd->t_data_sg = xop->xop_data_sg;
769 src_cmd->t_data_nents = xop->xop_data_nents;
770
771 transport_generic_free_cmd(se_cmd, 0);
772 return rc;
773 }
774
775 rc = target_xcopy_issue_pt_cmd(xpt_cmd);
776 if (rc < 0) {
777 se_cmd->se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
778 transport_generic_free_cmd(se_cmd, 0);
779 return rc;
780 }
781
782 return 0;
783}
784
785static void target_xcopy_do_work(struct work_struct *work)
786{
787 struct xcopy_op *xop = container_of(work, struct xcopy_op, xop_work);
788 struct se_device *src_dev = xop->src_dev, *dst_dev = xop->dst_dev;
789 struct se_cmd *ec_cmd = xop->xop_se_cmd;
790 sector_t src_lba = xop->src_lba, dst_lba = xop->dst_lba, end_lba;
791 unsigned int max_sectors;
792 int rc;
793 unsigned short nolb = xop->nolb, cur_nolb, max_nolb, copied_nolb = 0;
794
795 end_lba = src_lba + nolb;
796 /*
797 * Break up XCOPY I/O into hw_max_sectors sized I/O based on the
798 * smallest max_sectors between src_dev + dev_dev, or
799 */
800 max_sectors = min(src_dev->dev_attrib.hw_max_sectors,
801 dst_dev->dev_attrib.hw_max_sectors);
802 max_sectors = min_t(u32, max_sectors, XCOPY_MAX_SECTORS);
803
804 max_nolb = min_t(u16, max_sectors, ((u16)(~0U)));
805
806 pr_debug("target_xcopy_do_work: nolb: %hu, max_nolb: %hu end_lba: %llu\n",
807 nolb, max_nolb, (unsigned long long)end_lba);
808 pr_debug("target_xcopy_do_work: Starting src_lba: %llu, dst_lba: %llu\n",
809 (unsigned long long)src_lba, (unsigned long long)dst_lba);
810
811 while (src_lba < end_lba) {
812 cur_nolb = min(nolb, max_nolb);
813
814 pr_debug("target_xcopy_do_work: Calling read src_dev: %p src_lba: %llu,"
815 " cur_nolb: %hu\n", src_dev, (unsigned long long)src_lba, cur_nolb);
816
817 rc = target_xcopy_read_source(ec_cmd, xop, src_dev, src_lba, cur_nolb);
818 if (rc < 0)
819 goto out;
820
821 src_lba += cur_nolb;
822 pr_debug("target_xcopy_do_work: Incremented READ src_lba to %llu\n",
823 (unsigned long long)src_lba);
824
825 pr_debug("target_xcopy_do_work: Calling write dst_dev: %p dst_lba: %llu,"
826 " cur_nolb: %hu\n", dst_dev, (unsigned long long)dst_lba, cur_nolb);
827
828 rc = target_xcopy_write_destination(ec_cmd, xop, dst_dev,
829 dst_lba, cur_nolb);
830 if (rc < 0) {
831 transport_generic_free_cmd(&xop->src_pt_cmd->se_cmd, 0);
832 goto out;
833 }
834
835 dst_lba += cur_nolb;
836 pr_debug("target_xcopy_do_work: Incremented WRITE dst_lba to %llu\n",
837 (unsigned long long)dst_lba);
838
839 copied_nolb += cur_nolb;
840 nolb -= cur_nolb;
841
842 transport_generic_free_cmd(&xop->src_pt_cmd->se_cmd, 0);
843 xop->dst_pt_cmd->se_cmd.se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
844
845 transport_generic_free_cmd(&xop->dst_pt_cmd->se_cmd, 0);
846 }
847
848 xcopy_pt_undepend_remotedev(xop);
849 kfree(xop);
850
851 pr_debug("target_xcopy_do_work: Final src_lba: %llu, dst_lba: %llu\n",
852 (unsigned long long)src_lba, (unsigned long long)dst_lba);
853 pr_debug("target_xcopy_do_work: Blocks copied: %hu, Bytes Copied: %u\n",
854 copied_nolb, copied_nolb * dst_dev->dev_attrib.block_size);
855
856 pr_debug("target_xcopy_do_work: Setting X-COPY GOOD status -> sending response\n");
857 target_complete_cmd(ec_cmd, SAM_STAT_GOOD);
858 return;
859
860out:
861 xcopy_pt_undepend_remotedev(xop);
862 kfree(xop);
863
864 pr_warn("target_xcopy_do_work: Setting X-COPY CHECK_CONDITION -> sending response\n");
865 ec_cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
866 target_complete_cmd(ec_cmd, SAM_STAT_CHECK_CONDITION);
867}
868
869sense_reason_t target_do_xcopy(struct se_cmd *se_cmd)
870{
871 struct se_device *dev = se_cmd->se_dev;
872 struct xcopy_op *xop = NULL;
873 unsigned char *p = NULL, *seg_desc;
874 unsigned int list_id, list_id_usage, sdll, inline_dl, sa;
875 sense_reason_t ret = TCM_INVALID_PARAMETER_LIST;
876 int rc;
877 unsigned short tdll;
878
879 if (!dev->dev_attrib.emulate_3pc) {
880 pr_err("EXTENDED_COPY operation explicitly disabled\n");
881 return TCM_UNSUPPORTED_SCSI_OPCODE;
882 }
883
884 sa = se_cmd->t_task_cdb[1] & 0x1f;
885 if (sa != 0x00) {
886 pr_err("EXTENDED_COPY(LID4) not supported\n");
887 return TCM_UNSUPPORTED_SCSI_OPCODE;
888 }
889
890 xop = kzalloc(sizeof(struct xcopy_op), GFP_KERNEL);
891 if (!xop) {
892 pr_err("Unable to allocate xcopy_op\n");
893 return TCM_OUT_OF_RESOURCES;
894 }
895 xop->xop_se_cmd = se_cmd;
896
897 p = transport_kmap_data_sg(se_cmd);
898 if (!p) {
899 pr_err("transport_kmap_data_sg() failed in target_do_xcopy\n");
900 kfree(xop);
901 return TCM_OUT_OF_RESOURCES;
902 }
903
904 list_id = p[0];
905 list_id_usage = (p[1] & 0x18) >> 3;
906
907 /*
908 * Determine TARGET DESCRIPTOR LIST LENGTH + SEGMENT DESCRIPTOR LIST LENGTH
909 */
910 tdll = get_unaligned_be16(&p[2]);
911 sdll = get_unaligned_be32(&p[8]);
912
913 inline_dl = get_unaligned_be32(&p[12]);
914 if (inline_dl != 0) {
915 pr_err("XCOPY with non zero inline data length\n");
916 goto out;
917 }
918
919 pr_debug("Processing XCOPY with list_id: 0x%02x list_id_usage: 0x%02x"
920 " tdll: %hu sdll: %u inline_dl: %u\n", list_id, list_id_usage,
921 tdll, sdll, inline_dl);
922
923 rc = target_xcopy_parse_target_descriptors(se_cmd, xop, &p[16], tdll);
924 if (rc <= 0)
925 goto out;
926
927 if (xop->src_dev->dev_attrib.block_size !=
928 xop->dst_dev->dev_attrib.block_size) {
929 pr_err("XCOPY: Non matching src_dev block_size: %u + dst_dev"
930 " block_size: %u currently unsupported\n",
931 xop->src_dev->dev_attrib.block_size,
932 xop->dst_dev->dev_attrib.block_size);
933 xcopy_pt_undepend_remotedev(xop);
934 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
935 goto out;
936 }
937
938 pr_debug("XCOPY: Processed %d target descriptors, length: %u\n", rc,
939 rc * XCOPY_TARGET_DESC_LEN);
940 seg_desc = &p[16];
941 seg_desc += (rc * XCOPY_TARGET_DESC_LEN);
942
943 rc = target_xcopy_parse_segment_descriptors(se_cmd, xop, seg_desc, sdll);
944 if (rc <= 0) {
945 xcopy_pt_undepend_remotedev(xop);
946 goto out;
947 }
948 transport_kunmap_data_sg(se_cmd);
949
950 pr_debug("XCOPY: Processed %d segment descriptors, length: %u\n", rc,
951 rc * XCOPY_SEGMENT_DESC_LEN);
952 INIT_WORK(&xop->xop_work, target_xcopy_do_work);
953 queue_work(xcopy_wq, &xop->xop_work);
954 return TCM_NO_SENSE;
955
956out:
957 if (p)
958 transport_kunmap_data_sg(se_cmd);
959 kfree(xop);
960 return ret;
961}
962
963static sense_reason_t target_rcr_operating_parameters(struct se_cmd *se_cmd)
964{
965 unsigned char *p;
966
967 p = transport_kmap_data_sg(se_cmd);
968 if (!p) {
969 pr_err("transport_kmap_data_sg failed in"
970 " target_rcr_operating_parameters\n");
971 return TCM_OUT_OF_RESOURCES;
972 }
973
974 if (se_cmd->data_length < 54) {
975 pr_err("Receive Copy Results Op Parameters length"
976 " too small: %u\n", se_cmd->data_length);
977 transport_kunmap_data_sg(se_cmd);
978 return TCM_INVALID_CDB_FIELD;
979 }
980 /*
981 * Set SNLID=1 (Supports no List ID)
982 */
983 p[4] = 0x1;
984 /*
985 * MAXIMUM TARGET DESCRIPTOR COUNT
986 */
987 put_unaligned_be16(RCR_OP_MAX_TARGET_DESC_COUNT, &p[8]);
988 /*
989 * MAXIMUM SEGMENT DESCRIPTOR COUNT
990 */
991 put_unaligned_be16(RCR_OP_MAX_SG_DESC_COUNT, &p[10]);
992 /*
993 * MAXIMUM DESCRIPTOR LIST LENGTH
994 */
995 put_unaligned_be32(RCR_OP_MAX_DESC_LIST_LEN, &p[12]);
996 /*
997 * MAXIMUM SEGMENT LENGTH
998 */
999 put_unaligned_be32(RCR_OP_MAX_SEGMENT_LEN, &p[16]);
1000 /*
1001 * MAXIMUM INLINE DATA LENGTH for SA 0x04 (NOT SUPPORTED)
1002 */
1003 put_unaligned_be32(0x0, &p[20]);
1004 /*
1005 * HELD DATA LIMIT
1006 */
1007 put_unaligned_be32(0x0, &p[24]);
1008 /*
1009 * MAXIMUM STREAM DEVICE TRANSFER SIZE
1010 */
1011 put_unaligned_be32(0x0, &p[28]);
1012 /*
1013 * TOTAL CONCURRENT COPIES
1014 */
1015 put_unaligned_be16(RCR_OP_TOTAL_CONCURR_COPIES, &p[34]);
1016 /*
1017 * MAXIMUM CONCURRENT COPIES
1018 */
1019 p[36] = RCR_OP_MAX_CONCURR_COPIES;
1020 /*
1021 * DATA SEGMENT GRANULARITY (log 2)
1022 */
1023 p[37] = RCR_OP_DATA_SEG_GRAN_LOG2;
1024 /*
1025 * INLINE DATA GRANULARITY log 2)
1026 */
1027 p[38] = RCR_OP_INLINE_DATA_GRAN_LOG2;
1028 /*
1029 * HELD DATA GRANULARITY
1030 */
1031 p[39] = RCR_OP_HELD_DATA_GRAN_LOG2;
1032 /*
1033 * IMPLEMENTED DESCRIPTOR LIST LENGTH
1034 */
1035 p[43] = 0x2;
1036 /*
1037 * List of implemented descriptor type codes (ordered)
1038 */
1039 p[44] = 0x02; /* Copy Block to Block device */
1040 p[45] = 0xe4; /* Identification descriptor target descriptor */
1041
1042 /*
1043 * AVAILABLE DATA (n-3)
1044 */
1045 put_unaligned_be32(42, &p[0]);
1046
1047 transport_kunmap_data_sg(se_cmd);
1048 target_complete_cmd(se_cmd, GOOD);
1049
1050 return TCM_NO_SENSE;
1051}
1052
1053sense_reason_t target_do_receive_copy_results(struct se_cmd *se_cmd)
1054{
1055 unsigned char *cdb = &se_cmd->t_task_cdb[0];
1056 int sa = (cdb[1] & 0x1f), list_id = cdb[2];
1057 sense_reason_t rc = TCM_NO_SENSE;
1058
1059 pr_debug("Entering target_do_receive_copy_results: SA: 0x%02x, List ID:"
1060 " 0x%02x, AL: %u\n", sa, list_id, se_cmd->data_length);
1061
1062 if (list_id != 0) {
1063 pr_err("Receive Copy Results with non zero list identifier"
1064 " not supported\n");
1065 return TCM_INVALID_CDB_FIELD;
1066 }
1067
1068 switch (sa) {
1069 case RCR_SA_OPERATING_PARAMETERS:
1070 rc = target_rcr_operating_parameters(se_cmd);
1071 break;
1072 case RCR_SA_COPY_STATUS:
1073 case RCR_SA_RECEIVE_DATA:
1074 case RCR_SA_FAILED_SEGMENT_DETAILS:
1075 default:
1076 pr_err("Unsupported SA for receive copy results: 0x%02x\n", sa);
1077 return TCM_INVALID_CDB_FIELD;
1078 }
1079
1080 return rc;
1081}