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