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Merge tag 'driver-core-4.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git...
[deliverable/linux.git] / drivers / target / target_core_xcopy.c
1 /*******************************************************************************
2 * Filename: target_core_xcopy.c
3 *
4 * This file contains support for SPC-4 Extended-Copy offload with generic
5 * TCM backends.
6 *
7 * Copyright (c) 2011-2013 Datera, Inc. All rights reserved.
8 *
9 * Author:
10 * Nicholas A. Bellinger <nab@daterainc.com>
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
16 *
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
21 *
22 ******************************************************************************/
23
24 #include <linux/slab.h>
25 #include <linux/spinlock.h>
26 #include <linux/list.h>
27 #include <linux/configfs.h>
28 #include <scsi/scsi_proto.h>
29 #include <asm/unaligned.h>
30
31 #include <target/target_core_base.h>
32 #include <target/target_core_backend.h>
33 #include <target/target_core_fabric.h>
34 #include <target/target_core_configfs.h>
35
36 #include "target_core_internal.h"
37 #include "target_core_pr.h"
38 #include "target_core_ua.h"
39 #include "target_core_xcopy.h"
40
41 static struct workqueue_struct *xcopy_wq = NULL;
42
43 static int target_xcopy_gen_naa_ieee(struct se_device *dev, unsigned char *buf)
44 {
45 int off = 0;
46
47 buf[off++] = (0x6 << 4);
48 buf[off++] = 0x01;
49 buf[off++] = 0x40;
50 buf[off] = (0x5 << 4);
51
52 spc_parse_naa_6h_vendor_specific(dev, &buf[off]);
53 return 0;
54 }
55
56 static int target_xcopy_locate_se_dev_e4(struct se_cmd *se_cmd, struct xcopy_op *xop,
57 bool src)
58 {
59 struct se_device *se_dev;
60 unsigned char tmp_dev_wwn[XCOPY_NAA_IEEE_REGEX_LEN], *dev_wwn;
61 int rc;
62
63 if (src)
64 dev_wwn = &xop->dst_tid_wwn[0];
65 else
66 dev_wwn = &xop->src_tid_wwn[0];
67
68 mutex_lock(&g_device_mutex);
69 list_for_each_entry(se_dev, &g_device_list, g_dev_node) {
70
71 if (!se_dev->dev_attrib.emulate_3pc)
72 continue;
73
74 memset(&tmp_dev_wwn[0], 0, XCOPY_NAA_IEEE_REGEX_LEN);
75 target_xcopy_gen_naa_ieee(se_dev, &tmp_dev_wwn[0]);
76
77 rc = memcmp(&tmp_dev_wwn[0], dev_wwn, XCOPY_NAA_IEEE_REGEX_LEN);
78 if (rc != 0)
79 continue;
80
81 if (src) {
82 xop->dst_dev = se_dev;
83 pr_debug("XCOPY 0xe4: Setting xop->dst_dev: %p from located"
84 " se_dev\n", xop->dst_dev);
85 } else {
86 xop->src_dev = se_dev;
87 pr_debug("XCOPY 0xe4: Setting xop->src_dev: %p from located"
88 " se_dev\n", xop->src_dev);
89 }
90
91 rc = target_depend_item(&se_dev->dev_group.cg_item);
92 if (rc != 0) {
93 pr_err("configfs_depend_item attempt failed:"
94 " %d for se_dev: %p\n", rc, se_dev);
95 mutex_unlock(&g_device_mutex);
96 return rc;
97 }
98
99 pr_debug("Called configfs_depend_item for se_dev: %p"
100 " se_dev->se_dev_group: %p\n", se_dev,
101 &se_dev->dev_group);
102
103 mutex_unlock(&g_device_mutex);
104 return 0;
105 }
106 mutex_unlock(&g_device_mutex);
107
108 pr_err("Unable to locate 0xe4 descriptor for EXTENDED_COPY\n");
109 return -EINVAL;
110 }
111
112 static int target_xcopy_parse_tiddesc_e4(struct se_cmd *se_cmd, struct xcopy_op *xop,
113 unsigned char *p, bool src)
114 {
115 unsigned char *desc = p;
116 unsigned short ript;
117 u8 desig_len;
118 /*
119 * Extract RELATIVE INITIATOR PORT IDENTIFIER
120 */
121 ript = get_unaligned_be16(&desc[2]);
122 pr_debug("XCOPY 0xe4: RELATIVE INITIATOR PORT IDENTIFIER: %hu\n", ript);
123 /*
124 * Check for supported code set, association, and designator type
125 */
126 if ((desc[4] & 0x0f) != 0x1) {
127 pr_err("XCOPY 0xe4: code set of non binary type not supported\n");
128 return -EINVAL;
129 }
130 if ((desc[5] & 0x30) != 0x00) {
131 pr_err("XCOPY 0xe4: association other than LUN not supported\n");
132 return -EINVAL;
133 }
134 if ((desc[5] & 0x0f) != 0x3) {
135 pr_err("XCOPY 0xe4: designator type unsupported: 0x%02x\n",
136 (desc[5] & 0x0f));
137 return -EINVAL;
138 }
139 /*
140 * Check for matching 16 byte length for NAA IEEE Registered Extended
141 * Assigned designator
142 */
143 desig_len = desc[7];
144 if (desig_len != 16) {
145 pr_err("XCOPY 0xe4: invalid desig_len: %d\n", (int)desig_len);
146 return -EINVAL;
147 }
148 pr_debug("XCOPY 0xe4: desig_len: %d\n", (int)desig_len);
149 /*
150 * Check for NAA IEEE Registered Extended Assigned header..
151 */
152 if ((desc[8] & 0xf0) != 0x60) {
153 pr_err("XCOPY 0xe4: Unsupported DESIGNATOR TYPE: 0x%02x\n",
154 (desc[8] & 0xf0));
155 return -EINVAL;
156 }
157
158 if (src) {
159 memcpy(&xop->src_tid_wwn[0], &desc[8], XCOPY_NAA_IEEE_REGEX_LEN);
160 /*
161 * Determine if the source designator matches the local device
162 */
163 if (!memcmp(&xop->local_dev_wwn[0], &xop->src_tid_wwn[0],
164 XCOPY_NAA_IEEE_REGEX_LEN)) {
165 xop->op_origin = XCOL_SOURCE_RECV_OP;
166 xop->src_dev = se_cmd->se_dev;
167 pr_debug("XCOPY 0xe4: Set xop->src_dev %p from source"
168 " received xop\n", xop->src_dev);
169 }
170 } else {
171 memcpy(&xop->dst_tid_wwn[0], &desc[8], XCOPY_NAA_IEEE_REGEX_LEN);
172 /*
173 * Determine if the destination designator matches the local device
174 */
175 if (!memcmp(&xop->local_dev_wwn[0], &xop->dst_tid_wwn[0],
176 XCOPY_NAA_IEEE_REGEX_LEN)) {
177 xop->op_origin = XCOL_DEST_RECV_OP;
178 xop->dst_dev = se_cmd->se_dev;
179 pr_debug("XCOPY 0xe4: Set xop->dst_dev: %p from destination"
180 " received xop\n", xop->dst_dev);
181 }
182 }
183
184 return 0;
185 }
186
187 static int target_xcopy_parse_target_descriptors(struct se_cmd *se_cmd,
188 struct xcopy_op *xop, unsigned char *p,
189 unsigned short tdll)
190 {
191 struct se_device *local_dev = se_cmd->se_dev;
192 unsigned char *desc = p;
193 int offset = tdll % XCOPY_TARGET_DESC_LEN, rc, ret = 0;
194 unsigned short start = 0;
195 bool src = true;
196
197 if (offset != 0) {
198 pr_err("XCOPY target descriptor list length is not"
199 " multiple of %d\n", XCOPY_TARGET_DESC_LEN);
200 return -EINVAL;
201 }
202 if (tdll > 64) {
203 pr_err("XCOPY target descriptor supports a maximum"
204 " two src/dest descriptors, tdll: %hu too large..\n", tdll);
205 return -EINVAL;
206 }
207 /*
208 * Generate an IEEE Registered Extended designator based upon the
209 * se_device the XCOPY was received upon..
210 */
211 memset(&xop->local_dev_wwn[0], 0, XCOPY_NAA_IEEE_REGEX_LEN);
212 target_xcopy_gen_naa_ieee(local_dev, &xop->local_dev_wwn[0]);
213
214 while (start < tdll) {
215 /*
216 * Check target descriptor identification with 0xE4 type with
217 * use VPD 0x83 WWPN matching ..
218 */
219 switch (desc[0]) {
220 case 0xe4:
221 rc = target_xcopy_parse_tiddesc_e4(se_cmd, xop,
222 &desc[0], src);
223 if (rc != 0)
224 goto out;
225 /*
226 * Assume target descriptors are in source -> destination order..
227 */
228 if (src)
229 src = false;
230 else
231 src = true;
232 start += XCOPY_TARGET_DESC_LEN;
233 desc += XCOPY_TARGET_DESC_LEN;
234 ret++;
235 break;
236 default:
237 pr_err("XCOPY unsupported descriptor type code:"
238 " 0x%02x\n", desc[0]);
239 goto out;
240 }
241 }
242
243 if (xop->op_origin == XCOL_SOURCE_RECV_OP)
244 rc = target_xcopy_locate_se_dev_e4(se_cmd, xop, true);
245 else
246 rc = target_xcopy_locate_se_dev_e4(se_cmd, xop, false);
247
248 if (rc < 0)
249 goto out;
250
251 pr_debug("XCOPY TGT desc: Source dev: %p NAA IEEE WWN: 0x%16phN\n",
252 xop->src_dev, &xop->src_tid_wwn[0]);
253 pr_debug("XCOPY TGT desc: Dest dev: %p NAA IEEE WWN: 0x%16phN\n",
254 xop->dst_dev, &xop->dst_tid_wwn[0]);
255
256 return ret;
257
258 out:
259 return -EINVAL;
260 }
261
262 static int target_xcopy_parse_segdesc_02(struct se_cmd *se_cmd, struct xcopy_op *xop,
263 unsigned char *p)
264 {
265 unsigned char *desc = p;
266 int dc = (desc[1] & 0x02);
267 unsigned short desc_len;
268
269 desc_len = get_unaligned_be16(&desc[2]);
270 if (desc_len != 0x18) {
271 pr_err("XCOPY segment desc 0x02: Illegal desc_len:"
272 " %hu\n", desc_len);
273 return -EINVAL;
274 }
275
276 xop->stdi = get_unaligned_be16(&desc[4]);
277 xop->dtdi = get_unaligned_be16(&desc[6]);
278 pr_debug("XCOPY seg desc 0x02: desc_len: %hu stdi: %hu dtdi: %hu, DC: %d\n",
279 desc_len, xop->stdi, xop->dtdi, dc);
280
281 xop->nolb = get_unaligned_be16(&desc[10]);
282 xop->src_lba = get_unaligned_be64(&desc[12]);
283 xop->dst_lba = get_unaligned_be64(&desc[20]);
284 pr_debug("XCOPY seg desc 0x02: nolb: %hu src_lba: %llu dst_lba: %llu\n",
285 xop->nolb, (unsigned long long)xop->src_lba,
286 (unsigned long long)xop->dst_lba);
287
288 if (dc != 0) {
289 xop->dbl = (desc[29] & 0xff) << 16;
290 xop->dbl |= (desc[30] & 0xff) << 8;
291 xop->dbl |= desc[31] & 0xff;
292
293 pr_debug("XCOPY seg desc 0x02: DC=1 w/ dbl: %u\n", xop->dbl);
294 }
295 return 0;
296 }
297
298 static int target_xcopy_parse_segment_descriptors(struct se_cmd *se_cmd,
299 struct xcopy_op *xop, unsigned char *p,
300 unsigned int sdll)
301 {
302 unsigned char *desc = p;
303 unsigned int start = 0;
304 int offset = sdll % XCOPY_SEGMENT_DESC_LEN, rc, ret = 0;
305
306 if (offset != 0) {
307 pr_err("XCOPY segment descriptor list length is not"
308 " multiple of %d\n", XCOPY_SEGMENT_DESC_LEN);
309 return -EINVAL;
310 }
311
312 while (start < sdll) {
313 /*
314 * Check segment descriptor type code for block -> block
315 */
316 switch (desc[0]) {
317 case 0x02:
318 rc = target_xcopy_parse_segdesc_02(se_cmd, xop, desc);
319 if (rc < 0)
320 goto out;
321
322 ret++;
323 start += XCOPY_SEGMENT_DESC_LEN;
324 desc += XCOPY_SEGMENT_DESC_LEN;
325 break;
326 default:
327 pr_err("XCOPY unsupported segment descriptor"
328 "type: 0x%02x\n", desc[0]);
329 goto out;
330 }
331 }
332
333 return ret;
334
335 out:
336 return -EINVAL;
337 }
338
339 /*
340 * Start xcopy_pt ops
341 */
342
343 struct xcopy_pt_cmd {
344 bool remote_port;
345 struct se_cmd se_cmd;
346 struct xcopy_op *xcopy_op;
347 struct completion xpt_passthrough_sem;
348 unsigned char sense_buffer[TRANSPORT_SENSE_BUFFER];
349 };
350
351 static struct se_port xcopy_pt_port;
352 static struct se_portal_group xcopy_pt_tpg;
353 static struct se_session xcopy_pt_sess;
354 static struct se_node_acl xcopy_pt_nacl;
355
356 static char *xcopy_pt_get_fabric_name(void)
357 {
358 return "xcopy-pt";
359 }
360
361 static u32 xcopy_pt_get_tag(struct se_cmd *se_cmd)
362 {
363 return 0;
364 }
365
366 static int xcopy_pt_get_cmd_state(struct se_cmd *se_cmd)
367 {
368 return 0;
369 }
370
371 static void xcopy_pt_undepend_remotedev(struct xcopy_op *xop)
372 {
373 struct se_device *remote_dev;
374
375 if (xop->op_origin == XCOL_SOURCE_RECV_OP)
376 remote_dev = xop->dst_dev;
377 else
378 remote_dev = xop->src_dev;
379
380 pr_debug("Calling configfs_undepend_item for"
381 " remote_dev: %p remote_dev->dev_group: %p\n",
382 remote_dev, &remote_dev->dev_group.cg_item);
383
384 target_undepend_item(&remote_dev->dev_group.cg_item);
385 }
386
387 static void xcopy_pt_release_cmd(struct se_cmd *se_cmd)
388 {
389 struct xcopy_pt_cmd *xpt_cmd = container_of(se_cmd,
390 struct xcopy_pt_cmd, se_cmd);
391
392 kfree(xpt_cmd);
393 }
394
395 static int xcopy_pt_check_stop_free(struct se_cmd *se_cmd)
396 {
397 struct xcopy_pt_cmd *xpt_cmd = container_of(se_cmd,
398 struct xcopy_pt_cmd, se_cmd);
399
400 complete(&xpt_cmd->xpt_passthrough_sem);
401 return 0;
402 }
403
404 static int xcopy_pt_write_pending(struct se_cmd *se_cmd)
405 {
406 return 0;
407 }
408
409 static int xcopy_pt_write_pending_status(struct se_cmd *se_cmd)
410 {
411 return 0;
412 }
413
414 static int xcopy_pt_queue_data_in(struct se_cmd *se_cmd)
415 {
416 return 0;
417 }
418
419 static int xcopy_pt_queue_status(struct se_cmd *se_cmd)
420 {
421 return 0;
422 }
423
424 static const struct target_core_fabric_ops xcopy_pt_tfo = {
425 .get_fabric_name = xcopy_pt_get_fabric_name,
426 .get_task_tag = xcopy_pt_get_tag,
427 .get_cmd_state = xcopy_pt_get_cmd_state,
428 .release_cmd = xcopy_pt_release_cmd,
429 .check_stop_free = xcopy_pt_check_stop_free,
430 .write_pending = xcopy_pt_write_pending,
431 .write_pending_status = xcopy_pt_write_pending_status,
432 .queue_data_in = xcopy_pt_queue_data_in,
433 .queue_status = xcopy_pt_queue_status,
434 };
435
436 /*
437 * End xcopy_pt_ops
438 */
439
440 int target_xcopy_setup_pt(void)
441 {
442 xcopy_wq = alloc_workqueue("xcopy_wq", WQ_MEM_RECLAIM, 0);
443 if (!xcopy_wq) {
444 pr_err("Unable to allocate xcopy_wq\n");
445 return -ENOMEM;
446 }
447
448 memset(&xcopy_pt_port, 0, sizeof(struct se_port));
449 INIT_LIST_HEAD(&xcopy_pt_port.sep_alua_list);
450 INIT_LIST_HEAD(&xcopy_pt_port.sep_list);
451 mutex_init(&xcopy_pt_port.sep_tg_pt_md_mutex);
452
453 memset(&xcopy_pt_tpg, 0, sizeof(struct se_portal_group));
454 INIT_LIST_HEAD(&xcopy_pt_tpg.se_tpg_node);
455 INIT_LIST_HEAD(&xcopy_pt_tpg.acl_node_list);
456 INIT_LIST_HEAD(&xcopy_pt_tpg.tpg_sess_list);
457
458 xcopy_pt_port.sep_tpg = &xcopy_pt_tpg;
459 xcopy_pt_tpg.se_tpg_tfo = &xcopy_pt_tfo;
460
461 memset(&xcopy_pt_nacl, 0, sizeof(struct se_node_acl));
462 INIT_LIST_HEAD(&xcopy_pt_nacl.acl_list);
463 INIT_LIST_HEAD(&xcopy_pt_nacl.acl_sess_list);
464 memset(&xcopy_pt_sess, 0, sizeof(struct se_session));
465 INIT_LIST_HEAD(&xcopy_pt_sess.sess_list);
466 INIT_LIST_HEAD(&xcopy_pt_sess.sess_acl_list);
467
468 xcopy_pt_nacl.se_tpg = &xcopy_pt_tpg;
469 xcopy_pt_nacl.nacl_sess = &xcopy_pt_sess;
470
471 xcopy_pt_sess.se_tpg = &xcopy_pt_tpg;
472 xcopy_pt_sess.se_node_acl = &xcopy_pt_nacl;
473
474 return 0;
475 }
476
477 void target_xcopy_release_pt(void)
478 {
479 if (xcopy_wq)
480 destroy_workqueue(xcopy_wq);
481 }
482
483 static void target_xcopy_setup_pt_port(
484 struct xcopy_pt_cmd *xpt_cmd,
485 struct xcopy_op *xop,
486 bool remote_port)
487 {
488 struct se_cmd *ec_cmd = xop->xop_se_cmd;
489 struct se_cmd *pt_cmd = &xpt_cmd->se_cmd;
490
491 if (xop->op_origin == XCOL_SOURCE_RECV_OP) {
492 /*
493 * Honor destination port reservations for X-COPY PUSH emulation
494 * when CDB is received on local source port, and READs blocks to
495 * WRITE on remote destination port.
496 */
497 if (remote_port) {
498 xpt_cmd->remote_port = remote_port;
499 pt_cmd->se_lun->lun_sep = &xcopy_pt_port;
500 pr_debug("Setup emulated remote DEST xcopy_pt_port: %p to"
501 " cmd->se_lun->lun_sep for X-COPY data PUSH\n",
502 pt_cmd->se_lun->lun_sep);
503 } else {
504 pt_cmd->se_lun = ec_cmd->se_lun;
505 pt_cmd->se_dev = ec_cmd->se_dev;
506
507 pr_debug("Honoring local SRC port from ec_cmd->se_dev:"
508 " %p\n", pt_cmd->se_dev);
509 pt_cmd->se_lun = ec_cmd->se_lun;
510 pr_debug("Honoring local SRC port from ec_cmd->se_lun: %p\n",
511 pt_cmd->se_lun);
512 }
513 } else {
514 /*
515 * Honor source port reservation for X-COPY PULL emulation
516 * when CDB is received on local desintation port, and READs
517 * blocks from the remote source port to WRITE on local
518 * destination port.
519 */
520 if (remote_port) {
521 xpt_cmd->remote_port = remote_port;
522 pt_cmd->se_lun->lun_sep = &xcopy_pt_port;
523 pr_debug("Setup emulated remote SRC xcopy_pt_port: %p to"
524 " cmd->se_lun->lun_sep for X-COPY data PULL\n",
525 pt_cmd->se_lun->lun_sep);
526 } else {
527 pt_cmd->se_lun = ec_cmd->se_lun;
528 pt_cmd->se_dev = ec_cmd->se_dev;
529
530 pr_debug("Honoring local DST port from ec_cmd->se_dev:"
531 " %p\n", pt_cmd->se_dev);
532 pt_cmd->se_lun = ec_cmd->se_lun;
533 pr_debug("Honoring local DST port from ec_cmd->se_lun: %p\n",
534 pt_cmd->se_lun);
535 }
536 }
537 }
538
539 static void target_xcopy_init_pt_lun(struct se_device *se_dev,
540 struct se_cmd *pt_cmd, bool remote_port)
541 {
542 /*
543 * Don't allocate + init an pt_cmd->se_lun if honoring local port for
544 * reservations. The pt_cmd->se_lun pointer will be setup from within
545 * target_xcopy_setup_pt_port()
546 */
547 if (remote_port) {
548 pr_debug("Setup emulated se_dev: %p from se_dev\n",
549 pt_cmd->se_dev);
550 pt_cmd->se_lun = &se_dev->xcopy_lun;
551 pt_cmd->se_dev = se_dev;
552 }
553
554 pt_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
555 }
556
557 static int target_xcopy_setup_pt_cmd(
558 struct xcopy_pt_cmd *xpt_cmd,
559 struct xcopy_op *xop,
560 struct se_device *se_dev,
561 unsigned char *cdb,
562 bool remote_port,
563 bool alloc_mem)
564 {
565 struct se_cmd *cmd = &xpt_cmd->se_cmd;
566 sense_reason_t sense_rc;
567 int ret = 0, rc;
568 /*
569 * Setup LUN+port to honor reservations based upon xop->op_origin for
570 * X-COPY PUSH or X-COPY PULL based upon where the CDB was received.
571 */
572 target_xcopy_init_pt_lun(se_dev, cmd, remote_port);
573
574 xpt_cmd->xcopy_op = xop;
575 target_xcopy_setup_pt_port(xpt_cmd, xop, remote_port);
576
577 sense_rc = target_setup_cmd_from_cdb(cmd, cdb);
578 if (sense_rc) {
579 ret = -EINVAL;
580 goto out;
581 }
582
583 if (alloc_mem) {
584 rc = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents,
585 cmd->data_length, false);
586 if (rc < 0) {
587 ret = rc;
588 goto out;
589 }
590 /*
591 * Set this bit so that transport_free_pages() allows the
592 * caller to release SGLs + physical memory allocated by
593 * transport_generic_get_mem()..
594 */
595 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
596 } else {
597 /*
598 * Here the previously allocated SGLs for the internal READ
599 * are mapped zero-copy to the internal WRITE.
600 */
601 sense_rc = transport_generic_map_mem_to_cmd(cmd,
602 xop->xop_data_sg, xop->xop_data_nents,
603 NULL, 0);
604 if (sense_rc) {
605 ret = -EINVAL;
606 goto out;
607 }
608
609 pr_debug("Setup PASSTHROUGH_NOALLOC t_data_sg: %p t_data_nents:"
610 " %u\n", cmd->t_data_sg, cmd->t_data_nents);
611 }
612
613 return 0;
614
615 out:
616 return ret;
617 }
618
619 static int target_xcopy_issue_pt_cmd(struct xcopy_pt_cmd *xpt_cmd)
620 {
621 struct se_cmd *se_cmd = &xpt_cmd->se_cmd;
622 sense_reason_t sense_rc;
623
624 sense_rc = transport_generic_new_cmd(se_cmd);
625 if (sense_rc)
626 return -EINVAL;
627
628 if (se_cmd->data_direction == DMA_TO_DEVICE)
629 target_execute_cmd(se_cmd);
630
631 wait_for_completion_interruptible(&xpt_cmd->xpt_passthrough_sem);
632
633 pr_debug("target_xcopy_issue_pt_cmd(): SCSI status: 0x%02x\n",
634 se_cmd->scsi_status);
635
636 return (se_cmd->scsi_status) ? -EINVAL : 0;
637 }
638
639 static int target_xcopy_read_source(
640 struct se_cmd *ec_cmd,
641 struct xcopy_op *xop,
642 struct se_device *src_dev,
643 sector_t src_lba,
644 u32 src_sectors)
645 {
646 struct xcopy_pt_cmd *xpt_cmd;
647 struct se_cmd *se_cmd;
648 u32 length = (src_sectors * src_dev->dev_attrib.block_size);
649 int rc;
650 unsigned char cdb[16];
651 bool remote_port = (xop->op_origin == XCOL_DEST_RECV_OP);
652
653 xpt_cmd = kzalloc(sizeof(struct xcopy_pt_cmd), GFP_KERNEL);
654 if (!xpt_cmd) {
655 pr_err("Unable to allocate xcopy_pt_cmd\n");
656 return -ENOMEM;
657 }
658 init_completion(&xpt_cmd->xpt_passthrough_sem);
659 se_cmd = &xpt_cmd->se_cmd;
660
661 memset(&cdb[0], 0, 16);
662 cdb[0] = READ_16;
663 put_unaligned_be64(src_lba, &cdb[2]);
664 put_unaligned_be32(src_sectors, &cdb[10]);
665 pr_debug("XCOPY: Built READ_16: LBA: %llu Sectors: %u Length: %u\n",
666 (unsigned long long)src_lba, src_sectors, length);
667
668 transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, NULL, length,
669 DMA_FROM_DEVICE, 0, &xpt_cmd->sense_buffer[0]);
670 xop->src_pt_cmd = xpt_cmd;
671
672 rc = target_xcopy_setup_pt_cmd(xpt_cmd, xop, src_dev, &cdb[0],
673 remote_port, true);
674 if (rc < 0) {
675 transport_generic_free_cmd(se_cmd, 0);
676 return rc;
677 }
678
679 xop->xop_data_sg = se_cmd->t_data_sg;
680 xop->xop_data_nents = se_cmd->t_data_nents;
681 pr_debug("XCOPY-READ: Saved xop->xop_data_sg: %p, num: %u for READ"
682 " memory\n", xop->xop_data_sg, xop->xop_data_nents);
683
684 rc = target_xcopy_issue_pt_cmd(xpt_cmd);
685 if (rc < 0) {
686 transport_generic_free_cmd(se_cmd, 0);
687 return rc;
688 }
689 /*
690 * Clear off the allocated t_data_sg, that has been saved for
691 * zero-copy WRITE submission reuse in struct xcopy_op..
692 */
693 se_cmd->t_data_sg = NULL;
694 se_cmd->t_data_nents = 0;
695
696 return 0;
697 }
698
699 static int target_xcopy_write_destination(
700 struct se_cmd *ec_cmd,
701 struct xcopy_op *xop,
702 struct se_device *dst_dev,
703 sector_t dst_lba,
704 u32 dst_sectors)
705 {
706 struct xcopy_pt_cmd *xpt_cmd;
707 struct se_cmd *se_cmd;
708 u32 length = (dst_sectors * dst_dev->dev_attrib.block_size);
709 int rc;
710 unsigned char cdb[16];
711 bool remote_port = (xop->op_origin == XCOL_SOURCE_RECV_OP);
712
713 xpt_cmd = kzalloc(sizeof(struct xcopy_pt_cmd), GFP_KERNEL);
714 if (!xpt_cmd) {
715 pr_err("Unable to allocate xcopy_pt_cmd\n");
716 return -ENOMEM;
717 }
718 init_completion(&xpt_cmd->xpt_passthrough_sem);
719 se_cmd = &xpt_cmd->se_cmd;
720
721 memset(&cdb[0], 0, 16);
722 cdb[0] = WRITE_16;
723 put_unaligned_be64(dst_lba, &cdb[2]);
724 put_unaligned_be32(dst_sectors, &cdb[10]);
725 pr_debug("XCOPY: Built WRITE_16: LBA: %llu Sectors: %u Length: %u\n",
726 (unsigned long long)dst_lba, dst_sectors, length);
727
728 transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, NULL, length,
729 DMA_TO_DEVICE, 0, &xpt_cmd->sense_buffer[0]);
730 xop->dst_pt_cmd = xpt_cmd;
731
732 rc = target_xcopy_setup_pt_cmd(xpt_cmd, xop, dst_dev, &cdb[0],
733 remote_port, false);
734 if (rc < 0) {
735 struct se_cmd *src_cmd = &xop->src_pt_cmd->se_cmd;
736 /*
737 * If the failure happened before the t_mem_list hand-off in
738 * target_xcopy_setup_pt_cmd(), Reset memory + clear flag so that
739 * core releases this memory on error during X-COPY WRITE I/O.
740 */
741 src_cmd->se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
742 src_cmd->t_data_sg = xop->xop_data_sg;
743 src_cmd->t_data_nents = xop->xop_data_nents;
744
745 transport_generic_free_cmd(se_cmd, 0);
746 return rc;
747 }
748
749 rc = target_xcopy_issue_pt_cmd(xpt_cmd);
750 if (rc < 0) {
751 se_cmd->se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
752 transport_generic_free_cmd(se_cmd, 0);
753 return rc;
754 }
755
756 return 0;
757 }
758
759 static void target_xcopy_do_work(struct work_struct *work)
760 {
761 struct xcopy_op *xop = container_of(work, struct xcopy_op, xop_work);
762 struct se_device *src_dev = xop->src_dev, *dst_dev = xop->dst_dev;
763 struct se_cmd *ec_cmd = xop->xop_se_cmd;
764 sector_t src_lba = xop->src_lba, dst_lba = xop->dst_lba, end_lba;
765 unsigned int max_sectors;
766 int rc;
767 unsigned short nolb = xop->nolb, cur_nolb, max_nolb, copied_nolb = 0;
768
769 end_lba = src_lba + nolb;
770 /*
771 * Break up XCOPY I/O into hw_max_sectors sized I/O based on the
772 * smallest max_sectors between src_dev + dev_dev, or
773 */
774 max_sectors = min(src_dev->dev_attrib.hw_max_sectors,
775 dst_dev->dev_attrib.hw_max_sectors);
776 max_sectors = min_t(u32, max_sectors, XCOPY_MAX_SECTORS);
777
778 max_nolb = min_t(u16, max_sectors, ((u16)(~0U)));
779
780 pr_debug("target_xcopy_do_work: nolb: %hu, max_nolb: %hu end_lba: %llu\n",
781 nolb, max_nolb, (unsigned long long)end_lba);
782 pr_debug("target_xcopy_do_work: Starting src_lba: %llu, dst_lba: %llu\n",
783 (unsigned long long)src_lba, (unsigned long long)dst_lba);
784
785 while (src_lba < end_lba) {
786 cur_nolb = min(nolb, max_nolb);
787
788 pr_debug("target_xcopy_do_work: Calling read src_dev: %p src_lba: %llu,"
789 " cur_nolb: %hu\n", src_dev, (unsigned long long)src_lba, cur_nolb);
790
791 rc = target_xcopy_read_source(ec_cmd, xop, src_dev, src_lba, cur_nolb);
792 if (rc < 0)
793 goto out;
794
795 src_lba += cur_nolb;
796 pr_debug("target_xcopy_do_work: Incremented READ src_lba to %llu\n",
797 (unsigned long long)src_lba);
798
799 pr_debug("target_xcopy_do_work: Calling write dst_dev: %p dst_lba: %llu,"
800 " cur_nolb: %hu\n", dst_dev, (unsigned long long)dst_lba, cur_nolb);
801
802 rc = target_xcopy_write_destination(ec_cmd, xop, dst_dev,
803 dst_lba, cur_nolb);
804 if (rc < 0) {
805 transport_generic_free_cmd(&xop->src_pt_cmd->se_cmd, 0);
806 goto out;
807 }
808
809 dst_lba += cur_nolb;
810 pr_debug("target_xcopy_do_work: Incremented WRITE dst_lba to %llu\n",
811 (unsigned long long)dst_lba);
812
813 copied_nolb += cur_nolb;
814 nolb -= cur_nolb;
815
816 transport_generic_free_cmd(&xop->src_pt_cmd->se_cmd, 0);
817 xop->dst_pt_cmd->se_cmd.se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
818
819 transport_generic_free_cmd(&xop->dst_pt_cmd->se_cmd, 0);
820 }
821
822 xcopy_pt_undepend_remotedev(xop);
823 kfree(xop);
824
825 pr_debug("target_xcopy_do_work: Final src_lba: %llu, dst_lba: %llu\n",
826 (unsigned long long)src_lba, (unsigned long long)dst_lba);
827 pr_debug("target_xcopy_do_work: Blocks copied: %hu, Bytes Copied: %u\n",
828 copied_nolb, copied_nolb * dst_dev->dev_attrib.block_size);
829
830 pr_debug("target_xcopy_do_work: Setting X-COPY GOOD status -> sending response\n");
831 target_complete_cmd(ec_cmd, SAM_STAT_GOOD);
832 return;
833
834 out:
835 xcopy_pt_undepend_remotedev(xop);
836 kfree(xop);
837
838 pr_warn("target_xcopy_do_work: Setting X-COPY CHECK_CONDITION -> sending response\n");
839 ec_cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
840 target_complete_cmd(ec_cmd, SAM_STAT_CHECK_CONDITION);
841 }
842
843 sense_reason_t target_do_xcopy(struct se_cmd *se_cmd)
844 {
845 struct se_device *dev = se_cmd->se_dev;
846 struct xcopy_op *xop = NULL;
847 unsigned char *p = NULL, *seg_desc;
848 unsigned int list_id, list_id_usage, sdll, inline_dl, sa;
849 sense_reason_t ret = TCM_INVALID_PARAMETER_LIST;
850 int rc;
851 unsigned short tdll;
852
853 if (!dev->dev_attrib.emulate_3pc) {
854 pr_err("EXTENDED_COPY operation explicitly disabled\n");
855 return TCM_UNSUPPORTED_SCSI_OPCODE;
856 }
857
858 sa = se_cmd->t_task_cdb[1] & 0x1f;
859 if (sa != 0x00) {
860 pr_err("EXTENDED_COPY(LID4) not supported\n");
861 return TCM_UNSUPPORTED_SCSI_OPCODE;
862 }
863
864 xop = kzalloc(sizeof(struct xcopy_op), GFP_KERNEL);
865 if (!xop) {
866 pr_err("Unable to allocate xcopy_op\n");
867 return TCM_OUT_OF_RESOURCES;
868 }
869 xop->xop_se_cmd = se_cmd;
870
871 p = transport_kmap_data_sg(se_cmd);
872 if (!p) {
873 pr_err("transport_kmap_data_sg() failed in target_do_xcopy\n");
874 kfree(xop);
875 return TCM_OUT_OF_RESOURCES;
876 }
877
878 list_id = p[0];
879 list_id_usage = (p[1] & 0x18) >> 3;
880
881 /*
882 * Determine TARGET DESCRIPTOR LIST LENGTH + SEGMENT DESCRIPTOR LIST LENGTH
883 */
884 tdll = get_unaligned_be16(&p[2]);
885 sdll = get_unaligned_be32(&p[8]);
886
887 inline_dl = get_unaligned_be32(&p[12]);
888 if (inline_dl != 0) {
889 pr_err("XCOPY with non zero inline data length\n");
890 goto out;
891 }
892
893 pr_debug("Processing XCOPY with list_id: 0x%02x list_id_usage: 0x%02x"
894 " tdll: %hu sdll: %u inline_dl: %u\n", list_id, list_id_usage,
895 tdll, sdll, inline_dl);
896
897 rc = target_xcopy_parse_target_descriptors(se_cmd, xop, &p[16], tdll);
898 if (rc <= 0)
899 goto out;
900
901 if (xop->src_dev->dev_attrib.block_size !=
902 xop->dst_dev->dev_attrib.block_size) {
903 pr_err("XCOPY: Non matching src_dev block_size: %u + dst_dev"
904 " block_size: %u currently unsupported\n",
905 xop->src_dev->dev_attrib.block_size,
906 xop->dst_dev->dev_attrib.block_size);
907 xcopy_pt_undepend_remotedev(xop);
908 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
909 goto out;
910 }
911
912 pr_debug("XCOPY: Processed %d target descriptors, length: %u\n", rc,
913 rc * XCOPY_TARGET_DESC_LEN);
914 seg_desc = &p[16];
915 seg_desc += (rc * XCOPY_TARGET_DESC_LEN);
916
917 rc = target_xcopy_parse_segment_descriptors(se_cmd, xop, seg_desc, sdll);
918 if (rc <= 0) {
919 xcopy_pt_undepend_remotedev(xop);
920 goto out;
921 }
922 transport_kunmap_data_sg(se_cmd);
923
924 pr_debug("XCOPY: Processed %d segment descriptors, length: %u\n", rc,
925 rc * XCOPY_SEGMENT_DESC_LEN);
926 INIT_WORK(&xop->xop_work, target_xcopy_do_work);
927 queue_work(xcopy_wq, &xop->xop_work);
928 return TCM_NO_SENSE;
929
930 out:
931 if (p)
932 transport_kunmap_data_sg(se_cmd);
933 kfree(xop);
934 return ret;
935 }
936
937 static sense_reason_t target_rcr_operating_parameters(struct se_cmd *se_cmd)
938 {
939 unsigned char *p;
940
941 p = transport_kmap_data_sg(se_cmd);
942 if (!p) {
943 pr_err("transport_kmap_data_sg failed in"
944 " target_rcr_operating_parameters\n");
945 return TCM_OUT_OF_RESOURCES;
946 }
947
948 if (se_cmd->data_length < 54) {
949 pr_err("Receive Copy Results Op Parameters length"
950 " too small: %u\n", se_cmd->data_length);
951 transport_kunmap_data_sg(se_cmd);
952 return TCM_INVALID_CDB_FIELD;
953 }
954 /*
955 * Set SNLID=1 (Supports no List ID)
956 */
957 p[4] = 0x1;
958 /*
959 * MAXIMUM TARGET DESCRIPTOR COUNT
960 */
961 put_unaligned_be16(RCR_OP_MAX_TARGET_DESC_COUNT, &p[8]);
962 /*
963 * MAXIMUM SEGMENT DESCRIPTOR COUNT
964 */
965 put_unaligned_be16(RCR_OP_MAX_SG_DESC_COUNT, &p[10]);
966 /*
967 * MAXIMUM DESCRIPTOR LIST LENGTH
968 */
969 put_unaligned_be32(RCR_OP_MAX_DESC_LIST_LEN, &p[12]);
970 /*
971 * MAXIMUM SEGMENT LENGTH
972 */
973 put_unaligned_be32(RCR_OP_MAX_SEGMENT_LEN, &p[16]);
974 /*
975 * MAXIMUM INLINE DATA LENGTH for SA 0x04 (NOT SUPPORTED)
976 */
977 put_unaligned_be32(0x0, &p[20]);
978 /*
979 * HELD DATA LIMIT
980 */
981 put_unaligned_be32(0x0, &p[24]);
982 /*
983 * MAXIMUM STREAM DEVICE TRANSFER SIZE
984 */
985 put_unaligned_be32(0x0, &p[28]);
986 /*
987 * TOTAL CONCURRENT COPIES
988 */
989 put_unaligned_be16(RCR_OP_TOTAL_CONCURR_COPIES, &p[34]);
990 /*
991 * MAXIMUM CONCURRENT COPIES
992 */
993 p[36] = RCR_OP_MAX_CONCURR_COPIES;
994 /*
995 * DATA SEGMENT GRANULARITY (log 2)
996 */
997 p[37] = RCR_OP_DATA_SEG_GRAN_LOG2;
998 /*
999 * INLINE DATA GRANULARITY log 2)
1000 */
1001 p[38] = RCR_OP_INLINE_DATA_GRAN_LOG2;
1002 /*
1003 * HELD DATA GRANULARITY
1004 */
1005 p[39] = RCR_OP_HELD_DATA_GRAN_LOG2;
1006 /*
1007 * IMPLEMENTED DESCRIPTOR LIST LENGTH
1008 */
1009 p[43] = 0x2;
1010 /*
1011 * List of implemented descriptor type codes (ordered)
1012 */
1013 p[44] = 0x02; /* Copy Block to Block device */
1014 p[45] = 0xe4; /* Identification descriptor target descriptor */
1015
1016 /*
1017 * AVAILABLE DATA (n-3)
1018 */
1019 put_unaligned_be32(42, &p[0]);
1020
1021 transport_kunmap_data_sg(se_cmd);
1022 target_complete_cmd(se_cmd, GOOD);
1023
1024 return TCM_NO_SENSE;
1025 }
1026
1027 sense_reason_t target_do_receive_copy_results(struct se_cmd *se_cmd)
1028 {
1029 unsigned char *cdb = &se_cmd->t_task_cdb[0];
1030 int sa = (cdb[1] & 0x1f), list_id = cdb[2];
1031 sense_reason_t rc = TCM_NO_SENSE;
1032
1033 pr_debug("Entering target_do_receive_copy_results: SA: 0x%02x, List ID:"
1034 " 0x%02x, AL: %u\n", sa, list_id, se_cmd->data_length);
1035
1036 if (list_id != 0) {
1037 pr_err("Receive Copy Results with non zero list identifier"
1038 " not supported\n");
1039 return TCM_INVALID_CDB_FIELD;
1040 }
1041
1042 switch (sa) {
1043 case RCR_SA_OPERATING_PARAMETERS:
1044 rc = target_rcr_operating_parameters(se_cmd);
1045 break;
1046 case RCR_SA_COPY_STATUS:
1047 case RCR_SA_RECEIVE_DATA:
1048 case RCR_SA_FAILED_SEGMENT_DETAILS:
1049 default:
1050 pr_err("Unsupported SA for receive copy results: 0x%02x\n", sa);
1051 return TCM_INVALID_CDB_FIELD;
1052 }
1053
1054 return rc;
1055 }
Linux kernel - Deliverables
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