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perf tools: Don't clone maps from parent when synthesizing forks
[linux/fpc-iii.git] / drivers / target / target_core_xcopy.c
blob70adcfdca8d1309f82ae6c0dcbc3de3e36b033c5
1 /*******************************************************************************
2 * Filename: target_core_xcopy.c
3 *
4 * This file contains support for SPC-4 Extended-Copy offload with generic
5 * TCM backends.
6 *
7 * Copyright (c) 2011-2013 Datera, Inc. All rights reserved.
8 *
9 * Author:
10 * Nicholas A. Bellinger <nab@daterainc.com>
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
16 *
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
21 *
22 ******************************************************************************/
23
24 #include <linux/slab.h>
25 #include <linux/spinlock.h>
26 #include <linux/list.h>
27 #include <linux/configfs.h>
28 #include <linux/ratelimit.h>
29 #include <scsi/scsi_proto.h>
30 #include <asm/unaligned.h>
31
32 #include <target/target_core_base.h>
33 #include <target/target_core_backend.h>
34 #include <target/target_core_fabric.h>
35
36 #include "target_core_internal.h"
37 #include "target_core_pr.h"
38 #include "target_core_ua.h"
39 #include "target_core_xcopy.h"
40
41 static struct workqueue_struct *xcopy_wq = NULL;
42
43 static sense_reason_t target_parse_xcopy_cmd(struct xcopy_op *xop);
44
45 static int target_xcopy_gen_naa_ieee(struct se_device *dev, unsigned char *buf)
46 {
47 int off = 0;
48
49 buf[off++] = (0x6 << 4);
50 buf[off++] = 0x01;
51 buf[off++] = 0x40;
52 buf[off] = (0x5 << 4);
53
54 spc_parse_naa_6h_vendor_specific(dev, &buf[off]);
55 return 0;
56 }
57
58 struct xcopy_dev_search_info {
59 const unsigned char *dev_wwn;
60 struct se_device *found_dev;
61 };
62
63 static int target_xcopy_locate_se_dev_e4_iter(struct se_device *se_dev,
64 void *data)
65 {
66 struct xcopy_dev_search_info *info = data;
67 unsigned char tmp_dev_wwn[XCOPY_NAA_IEEE_REGEX_LEN];
68 int rc;
69
70 if (!se_dev->dev_attrib.emulate_3pc)
71 return 0;
72
73 memset(&tmp_dev_wwn[0], 0, XCOPY_NAA_IEEE_REGEX_LEN);
74 target_xcopy_gen_naa_ieee(se_dev, &tmp_dev_wwn[0]);
75
76 rc = memcmp(&tmp_dev_wwn[0], info->dev_wwn, XCOPY_NAA_IEEE_REGEX_LEN);
77 if (rc != 0)
78 return 0;
79
80 info->found_dev = se_dev;
81 pr_debug("XCOPY 0xe4: located se_dev: %p\n", se_dev);
82
83 rc = target_depend_item(&se_dev->dev_group.cg_item);
84 if (rc != 0) {
85 pr_err("configfs_depend_item attempt failed: %d for se_dev: %p\n",
86 rc, se_dev);
87 return rc;
88 }
89
90 pr_debug("Called configfs_depend_item for se_dev: %p se_dev->se_dev_group: %p\n",
91 se_dev, &se_dev->dev_group);
92 return 1;
93 }
94
95 static int target_xcopy_locate_se_dev_e4(const unsigned char *dev_wwn,
96 struct se_device **found_dev)
97 {
98 struct xcopy_dev_search_info info;
99 int ret;
100
101 memset(&info, 0, sizeof(info));
102 info.dev_wwn = dev_wwn;
103
104 ret = target_for_each_device(target_xcopy_locate_se_dev_e4_iter, &info);
105 if (ret == 1) {
106 *found_dev = info.found_dev;
107 return 0;
108 } else {
109 pr_debug_ratelimited("Unable to locate 0xe4 descriptor for EXTENDED_COPY\n");
110 return -EINVAL;
111 }
112 }
113
114 static int target_xcopy_parse_tiddesc_e4(struct se_cmd *se_cmd, struct xcopy_op *xop,
115 unsigned char *p, unsigned short cscd_index)
116 {
117 unsigned char *desc = p;
118 unsigned short ript;
119 u8 desig_len;
120 /*
121 * Extract RELATIVE INITIATOR PORT IDENTIFIER
122 */
123 ript = get_unaligned_be16(&desc[2]);
124 pr_debug("XCOPY 0xe4: RELATIVE INITIATOR PORT IDENTIFIER: %hu\n", ript);
125 /*
126 * Check for supported code set, association, and designator type
127 */
128 if ((desc[4] & 0x0f) != 0x1) {
129 pr_err("XCOPY 0xe4: code set of non binary type not supported\n");
130 return -EINVAL;
131 }
132 if ((desc[5] & 0x30) != 0x00) {
133 pr_err("XCOPY 0xe4: association other than LUN not supported\n");
134 return -EINVAL;
135 }
136 if ((desc[5] & 0x0f) != 0x3) {
137 pr_err("XCOPY 0xe4: designator type unsupported: 0x%02x\n",
138 (desc[5] & 0x0f));
139 return -EINVAL;
140 }
141 /*
142 * Check for matching 16 byte length for NAA IEEE Registered Extended
143 * Assigned designator
144 */
145 desig_len = desc[7];
146 if (desig_len != 16) {
147 pr_err("XCOPY 0xe4: invalid desig_len: %d\n", (int)desig_len);
148 return -EINVAL;
149 }
150 pr_debug("XCOPY 0xe4: desig_len: %d\n", (int)desig_len);
151 /*
152 * Check for NAA IEEE Registered Extended Assigned header..
153 */
154 if ((desc[8] & 0xf0) != 0x60) {
155 pr_err("XCOPY 0xe4: Unsupported DESIGNATOR TYPE: 0x%02x\n",
156 (desc[8] & 0xf0));
157 return -EINVAL;
158 }
159
160 if (cscd_index != xop->stdi && cscd_index != xop->dtdi) {
161 pr_debug("XCOPY 0xe4: ignoring CSCD entry %d - neither src nor "
162 "dest\n", cscd_index);
163 return 0;
164 }
165
166 if (cscd_index == xop->stdi) {
167 memcpy(&xop->src_tid_wwn[0], &desc[8], XCOPY_NAA_IEEE_REGEX_LEN);
168 /*
169 * Determine if the source designator matches the local device
170 */
171 if (!memcmp(&xop->local_dev_wwn[0], &xop->src_tid_wwn[0],
172 XCOPY_NAA_IEEE_REGEX_LEN)) {
173 xop->op_origin = XCOL_SOURCE_RECV_OP;
174 xop->src_dev = se_cmd->se_dev;
175 pr_debug("XCOPY 0xe4: Set xop->src_dev %p from source"
176 " received xop\n", xop->src_dev);
177 }
178 }
179
180 if (cscd_index == xop->dtdi) {
181 memcpy(&xop->dst_tid_wwn[0], &desc[8], XCOPY_NAA_IEEE_REGEX_LEN);
182 /*
183 * Determine if the destination designator matches the local
184 * device. If @cscd_index corresponds to both source (stdi) and
185 * destination (dtdi), or dtdi comes after stdi, then
186 * XCOL_DEST_RECV_OP wins.
187 */
188 if (!memcmp(&xop->local_dev_wwn[0], &xop->dst_tid_wwn[0],
189 XCOPY_NAA_IEEE_REGEX_LEN)) {
190 xop->op_origin = XCOL_DEST_RECV_OP;
191 xop->dst_dev = se_cmd->se_dev;
192 pr_debug("XCOPY 0xe4: Set xop->dst_dev: %p from destination"
193 " received xop\n", xop->dst_dev);
194 }
195 }
196
197 return 0;
198 }
199
200 static int target_xcopy_parse_target_descriptors(struct se_cmd *se_cmd,
201 struct xcopy_op *xop, unsigned char *p,
202 unsigned short tdll, sense_reason_t *sense_ret)
203 {
204 struct se_device *local_dev = se_cmd->se_dev;
205 unsigned char *desc = p;
206 int offset = tdll % XCOPY_TARGET_DESC_LEN, rc;
207 unsigned short cscd_index = 0;
208 unsigned short start = 0;
209
210 *sense_ret = TCM_INVALID_PARAMETER_LIST;
211
212 if (offset != 0) {
213 pr_err("XCOPY target descriptor list length is not"
214 " multiple of %d\n", XCOPY_TARGET_DESC_LEN);
215 *sense_ret = TCM_UNSUPPORTED_TARGET_DESC_TYPE_CODE;
216 return -EINVAL;
217 }
218 if (tdll > RCR_OP_MAX_TARGET_DESC_COUNT * XCOPY_TARGET_DESC_LEN) {
219 pr_err("XCOPY target descriptor supports a maximum"
220 " two src/dest descriptors, tdll: %hu too large..\n", tdll);
221 /* spc4r37 6.4.3.4 CSCD DESCRIPTOR LIST LENGTH field */
222 *sense_ret = TCM_TOO_MANY_TARGET_DESCS;
223 return -EINVAL;
224 }
225 /*
226 * Generate an IEEE Registered Extended designator based upon the
227 * se_device the XCOPY was received upon..
228 */
229 memset(&xop->local_dev_wwn[0], 0, XCOPY_NAA_IEEE_REGEX_LEN);
230 target_xcopy_gen_naa_ieee(local_dev, &xop->local_dev_wwn[0]);
231
232 while (start < tdll) {
233 /*
234 * Check target descriptor identification with 0xE4 type, and
235 * compare the current index with the CSCD descriptor IDs in
236 * the segment descriptor. Use VPD 0x83 WWPN matching ..
237 */
238 switch (desc[0]) {
239 case 0xe4:
240 rc = target_xcopy_parse_tiddesc_e4(se_cmd, xop,
241 &desc[0], cscd_index);
242 if (rc != 0)
243 goto out;
244 start += XCOPY_TARGET_DESC_LEN;
245 desc += XCOPY_TARGET_DESC_LEN;
246 cscd_index++;
247 break;
248 default:
249 pr_err("XCOPY unsupported descriptor type code:"
250 " 0x%02x\n", desc[0]);
251 *sense_ret = TCM_UNSUPPORTED_TARGET_DESC_TYPE_CODE;
252 goto out;
253 }
254 }
255
256 switch (xop->op_origin) {
257 case XCOL_SOURCE_RECV_OP:
258 rc = target_xcopy_locate_se_dev_e4(xop->dst_tid_wwn,
259 &xop->dst_dev);
260 break;
261 case XCOL_DEST_RECV_OP:
262 rc = target_xcopy_locate_se_dev_e4(xop->src_tid_wwn,
263 &xop->src_dev);
264 break;
265 default:
266 pr_err("XCOPY CSCD descriptor IDs not found in CSCD list - "
267 "stdi: %hu dtdi: %hu\n", xop->stdi, xop->dtdi);
268 rc = -EINVAL;
269 break;
270 }
271 /*
272 * If a matching IEEE NAA 0x83 descriptor for the requested device
273 * is not located on this node, return COPY_ABORTED with ASQ/ASQC
274 * 0x0d/0x02 - COPY_TARGET_DEVICE_NOT_REACHABLE to request the
275 * initiator to fall back to normal copy method.
276 */
277 if (rc < 0) {
278 *sense_ret = TCM_COPY_TARGET_DEVICE_NOT_REACHABLE;
279 goto out;
280 }
281
282 pr_debug("XCOPY TGT desc: Source dev: %p NAA IEEE WWN: 0x%16phN\n",
283 xop->src_dev, &xop->src_tid_wwn[0]);
284 pr_debug("XCOPY TGT desc: Dest dev: %p NAA IEEE WWN: 0x%16phN\n",
285 xop->dst_dev, &xop->dst_tid_wwn[0]);
286
287 return cscd_index;
288
289 out:
290 return -EINVAL;
291 }
292
293 static int target_xcopy_parse_segdesc_02(struct se_cmd *se_cmd, struct xcopy_op *xop,
294 unsigned char *p)
295 {
296 unsigned char *desc = p;
297 int dc = (desc[1] & 0x02);
298 unsigned short desc_len;
299
300 desc_len = get_unaligned_be16(&desc[2]);
301 if (desc_len != 0x18) {
302 pr_err("XCOPY segment desc 0x02: Illegal desc_len:"
303 " %hu\n", desc_len);
304 return -EINVAL;
305 }
306
307 xop->stdi = get_unaligned_be16(&desc[4]);
308 xop->dtdi = get_unaligned_be16(&desc[6]);
309
310 if (xop->stdi > XCOPY_CSCD_DESC_ID_LIST_OFF_MAX ||
311 xop->dtdi > XCOPY_CSCD_DESC_ID_LIST_OFF_MAX) {
312 pr_err("XCOPY segment desc 0x02: unsupported CSCD ID > 0x%x; stdi: %hu dtdi: %hu\n",
313 XCOPY_CSCD_DESC_ID_LIST_OFF_MAX, xop->stdi, xop->dtdi);
314 return -EINVAL;
315 }
316
317 pr_debug("XCOPY seg desc 0x02: desc_len: %hu stdi: %hu dtdi: %hu, DC: %d\n",
318 desc_len, xop->stdi, xop->dtdi, dc);
319
320 xop->nolb = get_unaligned_be16(&desc[10]);
321 xop->src_lba = get_unaligned_be64(&desc[12]);
322 xop->dst_lba = get_unaligned_be64(&desc[20]);
323 pr_debug("XCOPY seg desc 0x02: nolb: %hu src_lba: %llu dst_lba: %llu\n",
324 xop->nolb, (unsigned long long)xop->src_lba,
325 (unsigned long long)xop->dst_lba);
326
327 if (dc != 0) {
328 xop->dbl = get_unaligned_be24(&desc[29]);
329
330 pr_debug("XCOPY seg desc 0x02: DC=1 w/ dbl: %u\n", xop->dbl);
331 }
332 return 0;
333 }
334
335 static int target_xcopy_parse_segment_descriptors(struct se_cmd *se_cmd,
336 struct xcopy_op *xop, unsigned char *p,
337 unsigned int sdll, sense_reason_t *sense_ret)
338 {
339 unsigned char *desc = p;
340 unsigned int start = 0;
341 int offset = sdll % XCOPY_SEGMENT_DESC_LEN, rc, ret = 0;
342
343 *sense_ret = TCM_INVALID_PARAMETER_LIST;
344
345 if (offset != 0) {
346 pr_err("XCOPY segment descriptor list length is not"
347 " multiple of %d\n", XCOPY_SEGMENT_DESC_LEN);
348 *sense_ret = TCM_UNSUPPORTED_SEGMENT_DESC_TYPE_CODE;
349 return -EINVAL;
350 }
351 if (sdll > RCR_OP_MAX_SG_DESC_COUNT * XCOPY_SEGMENT_DESC_LEN) {
352 pr_err("XCOPY supports %u segment descriptor(s), sdll: %u too"
353 " large..\n", RCR_OP_MAX_SG_DESC_COUNT, sdll);
354 /* spc4r37 6.4.3.5 SEGMENT DESCRIPTOR LIST LENGTH field */
355 *sense_ret = TCM_TOO_MANY_SEGMENT_DESCS;
356 return -EINVAL;
357 }
358
359 while (start < sdll) {
360 /*
361 * Check segment descriptor type code for block -> block
362 */
363 switch (desc[0]) {
364 case 0x02:
365 rc = target_xcopy_parse_segdesc_02(se_cmd, xop, desc);
366 if (rc < 0)
367 goto out;
368
369 ret++;
370 start += XCOPY_SEGMENT_DESC_LEN;
371 desc += XCOPY_SEGMENT_DESC_LEN;
372 break;
373 default:
374 pr_err("XCOPY unsupported segment descriptor"
375 "type: 0x%02x\n", desc[0]);
376 *sense_ret = TCM_UNSUPPORTED_SEGMENT_DESC_TYPE_CODE;
377 goto out;
378 }
379 }
380
381 return ret;
382
383 out:
384 return -EINVAL;
385 }
386
387 /*
388 * Start xcopy_pt ops
389 */
390
391 struct xcopy_pt_cmd {
392 bool remote_port;
393 struct se_cmd se_cmd;
394 struct completion xpt_passthrough_sem;
395 unsigned char sense_buffer[TRANSPORT_SENSE_BUFFER];
396 };
397
398 struct se_portal_group xcopy_pt_tpg;
399 static struct se_session xcopy_pt_sess;
400 static struct se_node_acl xcopy_pt_nacl;
401
402 static char *xcopy_pt_get_fabric_name(void)
403 {
404 return "xcopy-pt";
405 }
406
407 static int xcopy_pt_get_cmd_state(struct se_cmd *se_cmd)
408 {
409 return 0;
410 }
411
412 static void xcopy_pt_undepend_remotedev(struct xcopy_op *xop)
413 {
414 struct se_device *remote_dev;
415
416 if (xop->op_origin == XCOL_SOURCE_RECV_OP)
417 remote_dev = xop->dst_dev;
418 else
419 remote_dev = xop->src_dev;
420
421 pr_debug("Calling configfs_undepend_item for"
422 " remote_dev: %p remote_dev->dev_group: %p\n",
423 remote_dev, &remote_dev->dev_group.cg_item);
424
425 target_undepend_item(&remote_dev->dev_group.cg_item);
426 }
427
428 static void xcopy_pt_release_cmd(struct se_cmd *se_cmd)
429 {
430 struct xcopy_pt_cmd *xpt_cmd = container_of(se_cmd,
431 struct xcopy_pt_cmd, se_cmd);
432
433 kfree(xpt_cmd);
434 }
435
436 static int xcopy_pt_check_stop_free(struct se_cmd *se_cmd)
437 {
438 struct xcopy_pt_cmd *xpt_cmd = container_of(se_cmd,
439 struct xcopy_pt_cmd, se_cmd);
440
441 complete(&xpt_cmd->xpt_passthrough_sem);
442 return 0;
443 }
444
445 static int xcopy_pt_write_pending(struct se_cmd *se_cmd)
446 {
447 return 0;
448 }
449
450 static int xcopy_pt_write_pending_status(struct se_cmd *se_cmd)
451 {
452 return 0;
453 }
454
455 static int xcopy_pt_queue_data_in(struct se_cmd *se_cmd)
456 {
457 return 0;
458 }
459
460 static int xcopy_pt_queue_status(struct se_cmd *se_cmd)
461 {
462 return 0;
463 }
464
465 static const struct target_core_fabric_ops xcopy_pt_tfo = {
466 .get_fabric_name = xcopy_pt_get_fabric_name,
467 .get_cmd_state = xcopy_pt_get_cmd_state,
468 .release_cmd = xcopy_pt_release_cmd,
469 .check_stop_free = xcopy_pt_check_stop_free,
470 .write_pending = xcopy_pt_write_pending,
471 .write_pending_status = xcopy_pt_write_pending_status,
472 .queue_data_in = xcopy_pt_queue_data_in,
473 .queue_status = xcopy_pt_queue_status,
474 };
475
476 /*
477 * End xcopy_pt_ops
478 */
479
480 int target_xcopy_setup_pt(void)
481 {
482 xcopy_wq = alloc_workqueue("xcopy_wq", WQ_MEM_RECLAIM, 0);
483 if (!xcopy_wq) {
484 pr_err("Unable to allocate xcopy_wq\n");
485 return -ENOMEM;
486 }
487
488 memset(&xcopy_pt_tpg, 0, sizeof(struct se_portal_group));
489 INIT_LIST_HEAD(&xcopy_pt_tpg.se_tpg_node);
490 INIT_LIST_HEAD(&xcopy_pt_tpg.acl_node_list);
491 INIT_LIST_HEAD(&xcopy_pt_tpg.tpg_sess_list);
492
493 xcopy_pt_tpg.se_tpg_tfo = &xcopy_pt_tfo;
494
495 memset(&xcopy_pt_nacl, 0, sizeof(struct se_node_acl));
496 INIT_LIST_HEAD(&xcopy_pt_nacl.acl_list);
497 INIT_LIST_HEAD(&xcopy_pt_nacl.acl_sess_list);
498 memset(&xcopy_pt_sess, 0, sizeof(struct se_session));
499 transport_init_session(&xcopy_pt_sess);
500
501 xcopy_pt_nacl.se_tpg = &xcopy_pt_tpg;
502 xcopy_pt_nacl.nacl_sess = &xcopy_pt_sess;
503
504 xcopy_pt_sess.se_tpg = &xcopy_pt_tpg;
505 xcopy_pt_sess.se_node_acl = &xcopy_pt_nacl;
506
507 return 0;
508 }
509
510 void target_xcopy_release_pt(void)
511 {
512 if (xcopy_wq)
513 destroy_workqueue(xcopy_wq);
514 }
515
516 static void target_xcopy_setup_pt_port(
517 struct xcopy_pt_cmd *xpt_cmd,
518 struct xcopy_op *xop,
519 bool remote_port)
520 {
521 struct se_cmd *ec_cmd = xop->xop_se_cmd;
522 struct se_cmd *pt_cmd = &xpt_cmd->se_cmd;
523
524 if (xop->op_origin == XCOL_SOURCE_RECV_OP) {
525 /*
526 * Honor destination port reservations for X-COPY PUSH emulation
527 * when CDB is received on local source port, and READs blocks to
528 * WRITE on remote destination port.
529 */
530 if (remote_port) {
531 xpt_cmd->remote_port = remote_port;
532 } else {
533 pt_cmd->se_lun = ec_cmd->se_lun;
534 pt_cmd->se_dev = ec_cmd->se_dev;
535
536 pr_debug("Honoring local SRC port from ec_cmd->se_dev:"
537 " %p\n", pt_cmd->se_dev);
538 pt_cmd->se_lun = ec_cmd->se_lun;
539 pr_debug("Honoring local SRC port from ec_cmd->se_lun: %p\n",
540 pt_cmd->se_lun);
541 }
542 } else {
543 /*
544 * Honor source port reservation for X-COPY PULL emulation
545 * when CDB is received on local desintation port, and READs
546 * blocks from the remote source port to WRITE on local
547 * destination port.
548 */
549 if (remote_port) {
550 xpt_cmd->remote_port = remote_port;
551 } else {
552 pt_cmd->se_lun = ec_cmd->se_lun;
553 pt_cmd->se_dev = ec_cmd->se_dev;
554
555 pr_debug("Honoring local DST port from ec_cmd->se_dev:"
556 " %p\n", pt_cmd->se_dev);
557 pt_cmd->se_lun = ec_cmd->se_lun;
558 pr_debug("Honoring local DST port from ec_cmd->se_lun: %p\n",
559 pt_cmd->se_lun);
560 }
561 }
562 }
563
564 static void target_xcopy_init_pt_lun(struct se_device *se_dev,
565 struct se_cmd *pt_cmd, bool remote_port)
566 {
567 /*
568 * Don't allocate + init an pt_cmd->se_lun if honoring local port for
569 * reservations. The pt_cmd->se_lun pointer will be setup from within
570 * target_xcopy_setup_pt_port()
571 */
572 if (remote_port) {
573 pr_debug("Setup emulated se_dev: %p from se_dev\n",
574 pt_cmd->se_dev);
575 pt_cmd->se_lun = &se_dev->xcopy_lun;
576 pt_cmd->se_dev = se_dev;
577 }
578
579 pt_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
580 }
581
582 static int target_xcopy_setup_pt_cmd(
583 struct xcopy_pt_cmd *xpt_cmd,
584 struct xcopy_op *xop,
585 struct se_device *se_dev,
586 unsigned char *cdb,
587 bool remote_port,
588 bool alloc_mem)
589 {
590 struct se_cmd *cmd = &xpt_cmd->se_cmd;
591 sense_reason_t sense_rc;
592 int ret = 0, rc;
593 /*
594 * Setup LUN+port to honor reservations based upon xop->op_origin for
595 * X-COPY PUSH or X-COPY PULL based upon where the CDB was received.
596 */
597 target_xcopy_init_pt_lun(se_dev, cmd, remote_port);
598 target_xcopy_setup_pt_port(xpt_cmd, xop, remote_port);
599
600 cmd->tag = 0;
601 sense_rc = target_setup_cmd_from_cdb(cmd, cdb);
602 if (sense_rc) {
603 ret = -EINVAL;
604 goto out;
605 }
606
607 if (alloc_mem) {
608 rc = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents,
609 cmd->data_length, false, false);
610 if (rc < 0) {
611 ret = rc;
612 goto out;
613 }
614 /*
615 * Set this bit so that transport_free_pages() allows the
616 * caller to release SGLs + physical memory allocated by
617 * transport_generic_get_mem()..
618 */
619 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
620 } else {
621 /*
622 * Here the previously allocated SGLs for the internal READ
623 * are mapped zero-copy to the internal WRITE.
624 */
625 sense_rc = transport_generic_map_mem_to_cmd(cmd,
626 xop->xop_data_sg, xop->xop_data_nents,
627 NULL, 0);
628 if (sense_rc) {
629 ret = -EINVAL;
630 goto out;
631 }
632
633 pr_debug("Setup PASSTHROUGH_NOALLOC t_data_sg: %p t_data_nents:"
634 " %u\n", cmd->t_data_sg, cmd->t_data_nents);
635 }
636
637 return 0;
638
639 out:
640 return ret;
641 }
642
643 static int target_xcopy_issue_pt_cmd(struct xcopy_pt_cmd *xpt_cmd)
644 {
645 struct se_cmd *se_cmd = &xpt_cmd->se_cmd;
646 sense_reason_t sense_rc;
647
648 sense_rc = transport_generic_new_cmd(se_cmd);
649 if (sense_rc)
650 return -EINVAL;
651
652 if (se_cmd->data_direction == DMA_TO_DEVICE)
653 target_execute_cmd(se_cmd);
654
655 wait_for_completion_interruptible(&xpt_cmd->xpt_passthrough_sem);
656
657 pr_debug("target_xcopy_issue_pt_cmd(): SCSI status: 0x%02x\n",
658 se_cmd->scsi_status);
659
660 return (se_cmd->scsi_status) ? -EINVAL : 0;
661 }
662
663 static int target_xcopy_read_source(
664 struct se_cmd *ec_cmd,
665 struct xcopy_op *xop,
666 struct se_device *src_dev,
667 sector_t src_lba,
668 u32 src_sectors)
669 {
670 struct xcopy_pt_cmd *xpt_cmd;
671 struct se_cmd *se_cmd;
672 u32 length = (src_sectors * src_dev->dev_attrib.block_size);
673 int rc;
674 unsigned char cdb[16];
675 bool remote_port = (xop->op_origin == XCOL_DEST_RECV_OP);
676
677 xpt_cmd = kzalloc(sizeof(struct xcopy_pt_cmd), GFP_KERNEL);
678 if (!xpt_cmd) {
679 pr_err("Unable to allocate xcopy_pt_cmd\n");
680 return -ENOMEM;
681 }
682 init_completion(&xpt_cmd->xpt_passthrough_sem);
683 se_cmd = &xpt_cmd->se_cmd;
684
685 memset(&cdb[0], 0, 16);
686 cdb[0] = READ_16;
687 put_unaligned_be64(src_lba, &cdb[2]);
688 put_unaligned_be32(src_sectors, &cdb[10]);
689 pr_debug("XCOPY: Built READ_16: LBA: %llu Sectors: %u Length: %u\n",
690 (unsigned long long)src_lba, src_sectors, length);
691
692 transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, &xcopy_pt_sess, length,
693 DMA_FROM_DEVICE, 0, &xpt_cmd->sense_buffer[0]);
694 xop->src_pt_cmd = xpt_cmd;
695
696 rc = target_xcopy_setup_pt_cmd(xpt_cmd, xop, src_dev, &cdb[0],
697 remote_port, true);
698 if (rc < 0) {
699 ec_cmd->scsi_status = xpt_cmd->se_cmd.scsi_status;
700 transport_generic_free_cmd(se_cmd, 0);
701 return rc;
702 }
703
704 xop->xop_data_sg = se_cmd->t_data_sg;
705 xop->xop_data_nents = se_cmd->t_data_nents;
706 pr_debug("XCOPY-READ: Saved xop->xop_data_sg: %p, num: %u for READ"
707 " memory\n", xop->xop_data_sg, xop->xop_data_nents);
708
709 rc = target_xcopy_issue_pt_cmd(xpt_cmd);
710 if (rc < 0) {
711 ec_cmd->scsi_status = xpt_cmd->se_cmd.scsi_status;
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
725 static 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, &xcopy_pt_sess, 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 ec_cmd->scsi_status = xpt_cmd->se_cmd.scsi_status;
763 /*
764 * If the failure happened before the t_mem_list hand-off in
765 * target_xcopy_setup_pt_cmd(), Reset memory + clear flag so that
766 * core releases this memory on error during X-COPY WRITE I/O.
767 */
768 src_cmd->se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
769 src_cmd->t_data_sg = xop->xop_data_sg;
770 src_cmd->t_data_nents = xop->xop_data_nents;
771
772 transport_generic_free_cmd(se_cmd, 0);
773 return rc;
774 }
775
776 rc = target_xcopy_issue_pt_cmd(xpt_cmd);
777 if (rc < 0) {
778 ec_cmd->scsi_status = xpt_cmd->se_cmd.scsi_status;
779 se_cmd->se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
780 transport_generic_free_cmd(se_cmd, 0);
781 return rc;
782 }
783
784 return 0;
785 }
786
787 static void target_xcopy_do_work(struct work_struct *work)
788 {
789 struct xcopy_op *xop = container_of(work, struct xcopy_op, xop_work);
790 struct se_cmd *ec_cmd = xop->xop_se_cmd;
791 struct se_device *src_dev, *dst_dev;
792 sector_t src_lba, dst_lba, end_lba;
793 unsigned int max_sectors;
794 int rc = 0;
795 unsigned short nolb, cur_nolb, max_nolb, copied_nolb = 0;
796
797 if (target_parse_xcopy_cmd(xop) != TCM_NO_SENSE)
798 goto err_free;
799
800 if (WARN_ON_ONCE(!xop->src_dev) || WARN_ON_ONCE(!xop->dst_dev))
801 goto err_free;
802
803 src_dev = xop->src_dev;
804 dst_dev = xop->dst_dev;
805 src_lba = xop->src_lba;
806 dst_lba = xop->dst_lba;
807 nolb = xop->nolb;
808 end_lba = src_lba + nolb;
809 /*
810 * Break up XCOPY I/O into hw_max_sectors sized I/O based on the
811 * smallest max_sectors between src_dev + dev_dev, or
812 */
813 max_sectors = min(src_dev->dev_attrib.hw_max_sectors,
814 dst_dev->dev_attrib.hw_max_sectors);
815 max_sectors = min_t(u32, max_sectors, XCOPY_MAX_SECTORS);
816
817 max_nolb = min_t(u16, max_sectors, ((u16)(~0U)));
818
819 pr_debug("target_xcopy_do_work: nolb: %hu, max_nolb: %hu end_lba: %llu\n",
820 nolb, max_nolb, (unsigned long long)end_lba);
821 pr_debug("target_xcopy_do_work: Starting src_lba: %llu, dst_lba: %llu\n",
822 (unsigned long long)src_lba, (unsigned long long)dst_lba);
823
824 while (src_lba < end_lba) {
825 cur_nolb = min(nolb, max_nolb);
826
827 pr_debug("target_xcopy_do_work: Calling read src_dev: %p src_lba: %llu,"
828 " cur_nolb: %hu\n", src_dev, (unsigned long long)src_lba, cur_nolb);
829
830 rc = target_xcopy_read_source(ec_cmd, xop, src_dev, src_lba, cur_nolb);
831 if (rc < 0)
832 goto out;
833
834 src_lba += cur_nolb;
835 pr_debug("target_xcopy_do_work: Incremented READ src_lba to %llu\n",
836 (unsigned long long)src_lba);
837
838 pr_debug("target_xcopy_do_work: Calling write dst_dev: %p dst_lba: %llu,"
839 " cur_nolb: %hu\n", dst_dev, (unsigned long long)dst_lba, cur_nolb);
840
841 rc = target_xcopy_write_destination(ec_cmd, xop, dst_dev,
842 dst_lba, cur_nolb);
843 if (rc < 0) {
844 transport_generic_free_cmd(&xop->src_pt_cmd->se_cmd, 0);
845 goto out;
846 }
847
848 dst_lba += cur_nolb;
849 pr_debug("target_xcopy_do_work: Incremented WRITE dst_lba to %llu\n",
850 (unsigned long long)dst_lba);
851
852 copied_nolb += cur_nolb;
853 nolb -= cur_nolb;
854
855 transport_generic_free_cmd(&xop->src_pt_cmd->se_cmd, 0);
856 xop->dst_pt_cmd->se_cmd.se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
857
858 transport_generic_free_cmd(&xop->dst_pt_cmd->se_cmd, 0);
859 }
860
861 xcopy_pt_undepend_remotedev(xop);
862 kfree(xop);
863
864 pr_debug("target_xcopy_do_work: Final src_lba: %llu, dst_lba: %llu\n",
865 (unsigned long long)src_lba, (unsigned long long)dst_lba);
866 pr_debug("target_xcopy_do_work: Blocks copied: %hu, Bytes Copied: %u\n",
867 copied_nolb, copied_nolb * dst_dev->dev_attrib.block_size);
868
869 pr_debug("target_xcopy_do_work: Setting X-COPY GOOD status -> sending response\n");
870 target_complete_cmd(ec_cmd, SAM_STAT_GOOD);
871 return;
872
873 out:
874 xcopy_pt_undepend_remotedev(xop);
875
876 err_free:
877 kfree(xop);
878 /*
879 * Don't override an error scsi status if it has already been set
880 */
881 if (ec_cmd->scsi_status == SAM_STAT_GOOD) {
882 pr_warn_ratelimited("target_xcopy_do_work: rc: %d, Setting X-COPY"
883 " CHECK_CONDITION -> sending response\n", rc);
884 ec_cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
885 }
886 target_complete_cmd(ec_cmd, ec_cmd->scsi_status);
887 }
888
889 /*
890 * Returns TCM_NO_SENSE upon success or a sense code != TCM_NO_SENSE if parsing
891 * fails.
892 */
893 static sense_reason_t target_parse_xcopy_cmd(struct xcopy_op *xop)
894 {
895 struct se_cmd *se_cmd = xop->xop_se_cmd;
896 unsigned char *p = NULL, *seg_desc;
897 unsigned int list_id, list_id_usage, sdll, inline_dl;
898 sense_reason_t ret = TCM_INVALID_PARAMETER_LIST;
899 int rc;
900 unsigned short tdll;
901
902 p = transport_kmap_data_sg(se_cmd);
903 if (!p) {
904 pr_err("transport_kmap_data_sg() failed in target_do_xcopy\n");
905 return TCM_OUT_OF_RESOURCES;
906 }
907
908 list_id = p[0];
909 list_id_usage = (p[1] & 0x18) >> 3;
910
911 /*
912 * Determine TARGET DESCRIPTOR LIST LENGTH + SEGMENT DESCRIPTOR LIST LENGTH
913 */
914 tdll = get_unaligned_be16(&p[2]);
915 sdll = get_unaligned_be32(&p[8]);
916 if (tdll + sdll > RCR_OP_MAX_DESC_LIST_LEN) {
917 pr_err("XCOPY descriptor list length %u exceeds maximum %u\n",
918 tdll + sdll, RCR_OP_MAX_DESC_LIST_LEN);
919 ret = TCM_PARAMETER_LIST_LENGTH_ERROR;
920 goto out;
921 }
922
923 inline_dl = get_unaligned_be32(&p[12]);
924 if (inline_dl != 0) {
925 pr_err("XCOPY with non zero inline data length\n");
926 goto out;
927 }
928
929 if (se_cmd->data_length < (XCOPY_HDR_LEN + tdll + sdll + inline_dl)) {
930 pr_err("XCOPY parameter truncation: data length %u too small "
931 "for tdll: %hu sdll: %u inline_dl: %u\n",
932 se_cmd->data_length, tdll, sdll, inline_dl);
933 ret = TCM_PARAMETER_LIST_LENGTH_ERROR;
934 goto out;
935 }
936
937 pr_debug("Processing XCOPY with list_id: 0x%02x list_id_usage: 0x%02x"
938 " tdll: %hu sdll: %u inline_dl: %u\n", list_id, list_id_usage,
939 tdll, sdll, inline_dl);
940
941 /*
942 * skip over the target descriptors until segment descriptors
943 * have been passed - CSCD ids are needed to determine src and dest.
944 */
945 seg_desc = &p[16] + tdll;
946
947 rc = target_xcopy_parse_segment_descriptors(se_cmd, xop, seg_desc,
948 sdll, &ret);
949 if (rc <= 0)
950 goto out;
951
952 pr_debug("XCOPY: Processed %d segment descriptors, length: %u\n", rc,
953 rc * XCOPY_SEGMENT_DESC_LEN);
954
955 rc = target_xcopy_parse_target_descriptors(se_cmd, xop, &p[16], tdll, &ret);
956 if (rc <= 0)
957 goto out;
958
959 if (xop->src_dev->dev_attrib.block_size !=
960 xop->dst_dev->dev_attrib.block_size) {
961 pr_err("XCOPY: Non matching src_dev block_size: %u + dst_dev"
962 " block_size: %u currently unsupported\n",
963 xop->src_dev->dev_attrib.block_size,
964 xop->dst_dev->dev_attrib.block_size);
965 xcopy_pt_undepend_remotedev(xop);
966 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
967 goto out;
968 }
969
970 pr_debug("XCOPY: Processed %d target descriptors, length: %u\n", rc,
971 rc * XCOPY_TARGET_DESC_LEN);
972 transport_kunmap_data_sg(se_cmd);
973 return TCM_NO_SENSE;
974
975 out:
976 if (p)
977 transport_kunmap_data_sg(se_cmd);
978 return ret;
979 }
980
981 sense_reason_t target_do_xcopy(struct se_cmd *se_cmd)
982 {
983 struct se_device *dev = se_cmd->se_dev;
984 struct xcopy_op *xop;
985 unsigned int sa;
986
987 if (!dev->dev_attrib.emulate_3pc) {
988 pr_err("EXTENDED_COPY operation explicitly disabled\n");
989 return TCM_UNSUPPORTED_SCSI_OPCODE;
990 }
991
992 sa = se_cmd->t_task_cdb[1] & 0x1f;
993 if (sa != 0x00) {
994 pr_err("EXTENDED_COPY(LID4) not supported\n");
995 return TCM_UNSUPPORTED_SCSI_OPCODE;
996 }
997
998 if (se_cmd->data_length == 0) {
999 target_complete_cmd(se_cmd, SAM_STAT_GOOD);
1000 return TCM_NO_SENSE;
1001 }
1002 if (se_cmd->data_length < XCOPY_HDR_LEN) {
1003 pr_err("XCOPY parameter truncation: length %u < hdr_len %u\n",
1004 se_cmd->data_length, XCOPY_HDR_LEN);
1005 return TCM_PARAMETER_LIST_LENGTH_ERROR;
1006 }
1007
1008 xop = kzalloc(sizeof(struct xcopy_op), GFP_KERNEL);
1009 if (!xop)
1010 goto err;
1011 xop->xop_se_cmd = se_cmd;
1012 INIT_WORK(&xop->xop_work, target_xcopy_do_work);
1013 if (WARN_ON_ONCE(!queue_work(xcopy_wq, &xop->xop_work)))
1014 goto free;
1015 return TCM_NO_SENSE;
1016
1017 free:
1018 kfree(xop);
1019
1020 err:
1021 return TCM_OUT_OF_RESOURCES;
1022 }
1023
1024 static sense_reason_t target_rcr_operating_parameters(struct se_cmd *se_cmd)
1025 {
1026 unsigned char *p;
1027
1028 p = transport_kmap_data_sg(se_cmd);
1029 if (!p) {
1030 pr_err("transport_kmap_data_sg failed in"
1031 " target_rcr_operating_parameters\n");
1032 return TCM_OUT_OF_RESOURCES;
1033 }
1034
1035 if (se_cmd->data_length < 54) {
1036 pr_err("Receive Copy Results Op Parameters length"
1037 " too small: %u\n", se_cmd->data_length);
1038 transport_kunmap_data_sg(se_cmd);
1039 return TCM_INVALID_CDB_FIELD;
1040 }
1041 /*
1042 * Set SNLID=1 (Supports no List ID)
1043 */
1044 p[4] = 0x1;
1045 /*
1046 * MAXIMUM TARGET DESCRIPTOR COUNT
1047 */
1048 put_unaligned_be16(RCR_OP_MAX_TARGET_DESC_COUNT, &p[8]);
1049 /*
1050 * MAXIMUM SEGMENT DESCRIPTOR COUNT
1051 */
1052 put_unaligned_be16(RCR_OP_MAX_SG_DESC_COUNT, &p[10]);
1053 /*
1054 * MAXIMUM DESCRIPTOR LIST LENGTH
1055 */
1056 put_unaligned_be32(RCR_OP_MAX_DESC_LIST_LEN, &p[12]);
1057 /*
1058 * MAXIMUM SEGMENT LENGTH
1059 */
1060 put_unaligned_be32(RCR_OP_MAX_SEGMENT_LEN, &p[16]);
1061 /*
1062 * MAXIMUM INLINE DATA LENGTH for SA 0x04 (NOT SUPPORTED)
1063 */
1064 put_unaligned_be32(0x0, &p[20]);
1065 /*
1066 * HELD DATA LIMIT
1067 */
1068 put_unaligned_be32(0x0, &p[24]);
1069 /*
1070 * MAXIMUM STREAM DEVICE TRANSFER SIZE
1071 */
1072 put_unaligned_be32(0x0, &p[28]);
1073 /*
1074 * TOTAL CONCURRENT COPIES
1075 */
1076 put_unaligned_be16(RCR_OP_TOTAL_CONCURR_COPIES, &p[34]);
1077 /*
1078 * MAXIMUM CONCURRENT COPIES
1079 */
1080 p[36] = RCR_OP_MAX_CONCURR_COPIES;
1081 /*
1082 * DATA SEGMENT GRANULARITY (log 2)
1083 */
1084 p[37] = RCR_OP_DATA_SEG_GRAN_LOG2;
1085 /*
1086 * INLINE DATA GRANULARITY log 2)
1087 */
1088 p[38] = RCR_OP_INLINE_DATA_GRAN_LOG2;
1089 /*
1090 * HELD DATA GRANULARITY
1091 */
1092 p[39] = RCR_OP_HELD_DATA_GRAN_LOG2;
1093 /*
1094 * IMPLEMENTED DESCRIPTOR LIST LENGTH
1095 */
1096 p[43] = 0x2;
1097 /*
1098 * List of implemented descriptor type codes (ordered)
1099 */
1100 p[44] = 0x02; /* Copy Block to Block device */
1101 p[45] = 0xe4; /* Identification descriptor target descriptor */
1102
1103 /*
1104 * AVAILABLE DATA (n-3)
1105 */
1106 put_unaligned_be32(42, &p[0]);
1107
1108 transport_kunmap_data_sg(se_cmd);
1109 target_complete_cmd(se_cmd, GOOD);
1110
1111 return TCM_NO_SENSE;
1112 }
1113
1114 sense_reason_t target_do_receive_copy_results(struct se_cmd *se_cmd)
1115 {
1116 unsigned char *cdb = &se_cmd->t_task_cdb[0];
1117 int sa = (cdb[1] & 0x1f), list_id = cdb[2];
1118 sense_reason_t rc = TCM_NO_SENSE;
1119
1120 pr_debug("Entering target_do_receive_copy_results: SA: 0x%02x, List ID:"
1121 " 0x%02x, AL: %u\n", sa, list_id, se_cmd->data_length);
1122
1123 if (list_id != 0) {
1124 pr_err("Receive Copy Results with non zero list identifier"
1125 " not supported\n");
1126 return TCM_INVALID_CDB_FIELD;
1127 }
1128
1129 switch (sa) {
1130 case RCR_SA_OPERATING_PARAMETERS:
1131 rc = target_rcr_operating_parameters(se_cmd);
1132 break;
1133 case RCR_SA_COPY_STATUS:
1134 case RCR_SA_RECEIVE_DATA:
1135 case RCR_SA_FAILED_SEGMENT_DETAILS:
1136 default:
1137 pr_err("Unsupported SA for receive copy results: 0x%02x\n", sa);
1138 return TCM_INVALID_CDB_FIELD;
1139 }
1140
1141 return rc;
1142 }
Linux with added FPC-III support