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target: target_core_configfs.h is not needed in fabric drivers
[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
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 int xcopy_pt_get_cmd_state(struct se_cmd *se_cmd)
362 {
363 return 0;
364 }
365
366 static void xcopy_pt_undepend_remotedev(struct xcopy_op *xop)
367 {
368 struct se_device *remote_dev;
369
370 if (xop->op_origin == XCOL_SOURCE_RECV_OP)
371 remote_dev = xop->dst_dev;
372 else
373 remote_dev = xop->src_dev;
374
375 pr_debug("Calling configfs_undepend_item for"
376 " remote_dev: %p remote_dev->dev_group: %p\n",
377 remote_dev, &remote_dev->dev_group.cg_item);
378
379 target_undepend_item(&remote_dev->dev_group.cg_item);
380 }
381
382 static void xcopy_pt_release_cmd(struct se_cmd *se_cmd)
383 {
384 struct xcopy_pt_cmd *xpt_cmd = container_of(se_cmd,
385 struct xcopy_pt_cmd, se_cmd);
386
387 kfree(xpt_cmd);
388 }
389
390 static int xcopy_pt_check_stop_free(struct se_cmd *se_cmd)
391 {
392 struct xcopy_pt_cmd *xpt_cmd = container_of(se_cmd,
393 struct xcopy_pt_cmd, se_cmd);
394
395 complete(&xpt_cmd->xpt_passthrough_sem);
396 return 0;
397 }
398
399 static int xcopy_pt_write_pending(struct se_cmd *se_cmd)
400 {
401 return 0;
402 }
403
404 static int xcopy_pt_write_pending_status(struct se_cmd *se_cmd)
405 {
406 return 0;
407 }
408
409 static int xcopy_pt_queue_data_in(struct se_cmd *se_cmd)
410 {
411 return 0;
412 }
413
414 static int xcopy_pt_queue_status(struct se_cmd *se_cmd)
415 {
416 return 0;
417 }
418
419 static const struct target_core_fabric_ops xcopy_pt_tfo = {
420 .get_fabric_name = xcopy_pt_get_fabric_name,
421 .get_cmd_state = xcopy_pt_get_cmd_state,
422 .release_cmd = xcopy_pt_release_cmd,
423 .check_stop_free = xcopy_pt_check_stop_free,
424 .write_pending = xcopy_pt_write_pending,
425 .write_pending_status = xcopy_pt_write_pending_status,
426 .queue_data_in = xcopy_pt_queue_data_in,
427 .queue_status = xcopy_pt_queue_status,
428 };
429
430 /*
431 * End xcopy_pt_ops
432 */
433
434 int target_xcopy_setup_pt(void)
435 {
436 xcopy_wq = alloc_workqueue("xcopy_wq", WQ_MEM_RECLAIM, 0);
437 if (!xcopy_wq) {
438 pr_err("Unable to allocate xcopy_wq\n");
439 return -ENOMEM;
440 }
441
442 memset(&xcopy_pt_port, 0, sizeof(struct se_port));
443 INIT_LIST_HEAD(&xcopy_pt_port.sep_alua_list);
444 INIT_LIST_HEAD(&xcopy_pt_port.sep_list);
445 mutex_init(&xcopy_pt_port.sep_tg_pt_md_mutex);
446
447 memset(&xcopy_pt_tpg, 0, sizeof(struct se_portal_group));
448 INIT_LIST_HEAD(&xcopy_pt_tpg.se_tpg_node);
449 INIT_LIST_HEAD(&xcopy_pt_tpg.acl_node_list);
450 INIT_LIST_HEAD(&xcopy_pt_tpg.tpg_sess_list);
451
452 xcopy_pt_port.sep_tpg = &xcopy_pt_tpg;
453 xcopy_pt_tpg.se_tpg_tfo = &xcopy_pt_tfo;
454
455 memset(&xcopy_pt_nacl, 0, sizeof(struct se_node_acl));
456 INIT_LIST_HEAD(&xcopy_pt_nacl.acl_list);
457 INIT_LIST_HEAD(&xcopy_pt_nacl.acl_sess_list);
458 memset(&xcopy_pt_sess, 0, sizeof(struct se_session));
459 INIT_LIST_HEAD(&xcopy_pt_sess.sess_list);
460 INIT_LIST_HEAD(&xcopy_pt_sess.sess_acl_list);
461
462 xcopy_pt_nacl.se_tpg = &xcopy_pt_tpg;
463 xcopy_pt_nacl.nacl_sess = &xcopy_pt_sess;
464
465 xcopy_pt_sess.se_tpg = &xcopy_pt_tpg;
466 xcopy_pt_sess.se_node_acl = &xcopy_pt_nacl;
467
468 return 0;
469 }
470
471 void target_xcopy_release_pt(void)
472 {
473 if (xcopy_wq)
474 destroy_workqueue(xcopy_wq);
475 }
476
477 static void target_xcopy_setup_pt_port(
478 struct xcopy_pt_cmd *xpt_cmd,
479 struct xcopy_op *xop,
480 bool remote_port)
481 {
482 struct se_cmd *ec_cmd = xop->xop_se_cmd;
483 struct se_cmd *pt_cmd = &xpt_cmd->se_cmd;
484
485 if (xop->op_origin == XCOL_SOURCE_RECV_OP) {
486 /*
487 * Honor destination port reservations for X-COPY PUSH emulation
488 * when CDB is received on local source port, and READs blocks to
489 * WRITE on remote destination port.
490 */
491 if (remote_port) {
492 xpt_cmd->remote_port = remote_port;
493 pt_cmd->se_lun->lun_sep = &xcopy_pt_port;
494 pr_debug("Setup emulated remote DEST xcopy_pt_port: %p to"
495 " cmd->se_lun->lun_sep for X-COPY data PUSH\n",
496 pt_cmd->se_lun->lun_sep);
497 } else {
498 pt_cmd->se_lun = ec_cmd->se_lun;
499 pt_cmd->se_dev = ec_cmd->se_dev;
500
501 pr_debug("Honoring local SRC port from ec_cmd->se_dev:"
502 " %p\n", pt_cmd->se_dev);
503 pt_cmd->se_lun = ec_cmd->se_lun;
504 pr_debug("Honoring local SRC port from ec_cmd->se_lun: %p\n",
505 pt_cmd->se_lun);
506 }
507 } else {
508 /*
509 * Honor source port reservation for X-COPY PULL emulation
510 * when CDB is received on local desintation port, and READs
511 * blocks from the remote source port to WRITE on local
512 * destination port.
513 */
514 if (remote_port) {
515 xpt_cmd->remote_port = remote_port;
516 pt_cmd->se_lun->lun_sep = &xcopy_pt_port;
517 pr_debug("Setup emulated remote SRC xcopy_pt_port: %p to"
518 " cmd->se_lun->lun_sep for X-COPY data PULL\n",
519 pt_cmd->se_lun->lun_sep);
520 } else {
521 pt_cmd->se_lun = ec_cmd->se_lun;
522 pt_cmd->se_dev = ec_cmd->se_dev;
523
524 pr_debug("Honoring local DST port from ec_cmd->se_dev:"
525 " %p\n", pt_cmd->se_dev);
526 pt_cmd->se_lun = ec_cmd->se_lun;
527 pr_debug("Honoring local DST port from ec_cmd->se_lun: %p\n",
528 pt_cmd->se_lun);
529 }
530 }
531 }
532
533 static void target_xcopy_init_pt_lun(struct se_device *se_dev,
534 struct se_cmd *pt_cmd, bool remote_port)
535 {
536 /*
537 * Don't allocate + init an pt_cmd->se_lun if honoring local port for
538 * reservations. The pt_cmd->se_lun pointer will be setup from within
539 * target_xcopy_setup_pt_port()
540 */
541 if (remote_port) {
542 pr_debug("Setup emulated se_dev: %p from se_dev\n",
543 pt_cmd->se_dev);
544 pt_cmd->se_lun = &se_dev->xcopy_lun;
545 pt_cmd->se_dev = se_dev;
546 }
547
548 pt_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
549 }
550
551 static int target_xcopy_setup_pt_cmd(
552 struct xcopy_pt_cmd *xpt_cmd,
553 struct xcopy_op *xop,
554 struct se_device *se_dev,
555 unsigned char *cdb,
556 bool remote_port,
557 bool alloc_mem)
558 {
559 struct se_cmd *cmd = &xpt_cmd->se_cmd;
560 sense_reason_t sense_rc;
561 int ret = 0, rc;
562 /*
563 * Setup LUN+port to honor reservations based upon xop->op_origin for
564 * X-COPY PUSH or X-COPY PULL based upon where the CDB was received.
565 */
566 target_xcopy_init_pt_lun(se_dev, cmd, remote_port);
567
568 xpt_cmd->xcopy_op = xop;
569 target_xcopy_setup_pt_port(xpt_cmd, xop, remote_port);
570
571 cmd->tag = 0;
572 sense_rc = target_setup_cmd_from_cdb(cmd, cdb);
573 if (sense_rc) {
574 ret = -EINVAL;
575 goto out;
576 }
577
578 if (alloc_mem) {
579 rc = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents,
580 cmd->data_length, false);
581 if (rc < 0) {
582 ret = rc;
583 goto out;
584 }
585 /*
586 * Set this bit so that transport_free_pages() allows the
587 * caller to release SGLs + physical memory allocated by
588 * transport_generic_get_mem()..
589 */
590 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
591 } else {
592 /*
593 * Here the previously allocated SGLs for the internal READ
594 * are mapped zero-copy to the internal WRITE.
595 */
596 sense_rc = transport_generic_map_mem_to_cmd(cmd,
597 xop->xop_data_sg, xop->xop_data_nents,
598 NULL, 0);
599 if (sense_rc) {
600 ret = -EINVAL;
601 goto out;
602 }
603
604 pr_debug("Setup PASSTHROUGH_NOALLOC t_data_sg: %p t_data_nents:"
605 " %u\n", cmd->t_data_sg, cmd->t_data_nents);
606 }
607
608 return 0;
609
610 out:
611 return ret;
612 }
613
614 static int target_xcopy_issue_pt_cmd(struct xcopy_pt_cmd *xpt_cmd)
615 {
616 struct se_cmd *se_cmd = &xpt_cmd->se_cmd;
617 sense_reason_t sense_rc;
618
619 sense_rc = transport_generic_new_cmd(se_cmd);
620 if (sense_rc)
621 return -EINVAL;
622
623 if (se_cmd->data_direction == DMA_TO_DEVICE)
624 target_execute_cmd(se_cmd);
625
626 wait_for_completion_interruptible(&xpt_cmd->xpt_passthrough_sem);
627
628 pr_debug("target_xcopy_issue_pt_cmd(): SCSI status: 0x%02x\n",
629 se_cmd->scsi_status);
630
631 return (se_cmd->scsi_status) ? -EINVAL : 0;
632 }
633
634 static int target_xcopy_read_source(
635 struct se_cmd *ec_cmd,
636 struct xcopy_op *xop,
637 struct se_device *src_dev,
638 sector_t src_lba,
639 u32 src_sectors)
640 {
641 struct xcopy_pt_cmd *xpt_cmd;
642 struct se_cmd *se_cmd;
643 u32 length = (src_sectors * src_dev->dev_attrib.block_size);
644 int rc;
645 unsigned char cdb[16];
646 bool remote_port = (xop->op_origin == XCOL_DEST_RECV_OP);
647
648 xpt_cmd = kzalloc(sizeof(struct xcopy_pt_cmd), GFP_KERNEL);
649 if (!xpt_cmd) {
650 pr_err("Unable to allocate xcopy_pt_cmd\n");
651 return -ENOMEM;
652 }
653 init_completion(&xpt_cmd->xpt_passthrough_sem);
654 se_cmd = &xpt_cmd->se_cmd;
655
656 memset(&cdb[0], 0, 16);
657 cdb[0] = READ_16;
658 put_unaligned_be64(src_lba, &cdb[2]);
659 put_unaligned_be32(src_sectors, &cdb[10]);
660 pr_debug("XCOPY: Built READ_16: LBA: %llu Sectors: %u Length: %u\n",
661 (unsigned long long)src_lba, src_sectors, length);
662
663 transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, NULL, length,
664 DMA_FROM_DEVICE, 0, &xpt_cmd->sense_buffer[0]);
665 xop->src_pt_cmd = xpt_cmd;
666
667 rc = target_xcopy_setup_pt_cmd(xpt_cmd, xop, src_dev, &cdb[0],
668 remote_port, true);
669 if (rc < 0) {
670 transport_generic_free_cmd(se_cmd, 0);
671 return rc;
672 }
673
674 xop->xop_data_sg = se_cmd->t_data_sg;
675 xop->xop_data_nents = se_cmd->t_data_nents;
676 pr_debug("XCOPY-READ: Saved xop->xop_data_sg: %p, num: %u for READ"
677 " memory\n", xop->xop_data_sg, xop->xop_data_nents);
678
679 rc = target_xcopy_issue_pt_cmd(xpt_cmd);
680 if (rc < 0) {
681 transport_generic_free_cmd(se_cmd, 0);
682 return rc;
683 }
684 /*
685 * Clear off the allocated t_data_sg, that has been saved for
686 * zero-copy WRITE submission reuse in struct xcopy_op..
687 */
688 se_cmd->t_data_sg = NULL;
689 se_cmd->t_data_nents = 0;
690
691 return 0;
692 }
693
694 static int target_xcopy_write_destination(
695 struct se_cmd *ec_cmd,
696 struct xcopy_op *xop,
697 struct se_device *dst_dev,
698 sector_t dst_lba,
699 u32 dst_sectors)
700 {
701 struct xcopy_pt_cmd *xpt_cmd;
702 struct se_cmd *se_cmd;
703 u32 length = (dst_sectors * dst_dev->dev_attrib.block_size);
704 int rc;
705 unsigned char cdb[16];
706 bool remote_port = (xop->op_origin == XCOL_SOURCE_RECV_OP);
707
708 xpt_cmd = kzalloc(sizeof(struct xcopy_pt_cmd), GFP_KERNEL);
709 if (!xpt_cmd) {
710 pr_err("Unable to allocate xcopy_pt_cmd\n");
711 return -ENOMEM;
712 }
713 init_completion(&xpt_cmd->xpt_passthrough_sem);
714 se_cmd = &xpt_cmd->se_cmd;
715
716 memset(&cdb[0], 0, 16);
717 cdb[0] = WRITE_16;
718 put_unaligned_be64(dst_lba, &cdb[2]);
719 put_unaligned_be32(dst_sectors, &cdb[10]);
720 pr_debug("XCOPY: Built WRITE_16: LBA: %llu Sectors: %u Length: %u\n",
721 (unsigned long long)dst_lba, dst_sectors, length);
722
723 transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, NULL, length,
724 DMA_TO_DEVICE, 0, &xpt_cmd->sense_buffer[0]);
725 xop->dst_pt_cmd = xpt_cmd;
726
727 rc = target_xcopy_setup_pt_cmd(xpt_cmd, xop, dst_dev, &cdb[0],
728 remote_port, false);
729 if (rc < 0) {
730 struct se_cmd *src_cmd = &xop->src_pt_cmd->se_cmd;
731 /*
732 * If the failure happened before the t_mem_list hand-off in
733 * target_xcopy_setup_pt_cmd(), Reset memory + clear flag so that
734 * core releases this memory on error during X-COPY WRITE I/O.
735 */
736 src_cmd->se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
737 src_cmd->t_data_sg = xop->xop_data_sg;
738 src_cmd->t_data_nents = xop->xop_data_nents;
739
740 transport_generic_free_cmd(se_cmd, 0);
741 return rc;
742 }
743
744 rc = target_xcopy_issue_pt_cmd(xpt_cmd);
745 if (rc < 0) {
746 se_cmd->se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
747 transport_generic_free_cmd(se_cmd, 0);
748 return rc;
749 }
750
751 return 0;
752 }
753
754 static void target_xcopy_do_work(struct work_struct *work)
755 {
756 struct xcopy_op *xop = container_of(work, struct xcopy_op, xop_work);
757 struct se_device *src_dev = xop->src_dev, *dst_dev = xop->dst_dev;
758 struct se_cmd *ec_cmd = xop->xop_se_cmd;
759 sector_t src_lba = xop->src_lba, dst_lba = xop->dst_lba, end_lba;
760 unsigned int max_sectors;
761 int rc;
762 unsigned short nolb = xop->nolb, cur_nolb, max_nolb, copied_nolb = 0;
763
764 end_lba = src_lba + nolb;
765 /*
766 * Break up XCOPY I/O into hw_max_sectors sized I/O based on the
767 * smallest max_sectors between src_dev + dev_dev, or
768 */
769 max_sectors = min(src_dev->dev_attrib.hw_max_sectors,
770 dst_dev->dev_attrib.hw_max_sectors);
771 max_sectors = min_t(u32, max_sectors, XCOPY_MAX_SECTORS);
772
773 max_nolb = min_t(u16, max_sectors, ((u16)(~0U)));
774
775 pr_debug("target_xcopy_do_work: nolb: %hu, max_nolb: %hu end_lba: %llu\n",
776 nolb, max_nolb, (unsigned long long)end_lba);
777 pr_debug("target_xcopy_do_work: Starting src_lba: %llu, dst_lba: %llu\n",
778 (unsigned long long)src_lba, (unsigned long long)dst_lba);
779
780 while (src_lba < end_lba) {
781 cur_nolb = min(nolb, max_nolb);
782
783 pr_debug("target_xcopy_do_work: Calling read src_dev: %p src_lba: %llu,"
784 " cur_nolb: %hu\n", src_dev, (unsigned long long)src_lba, cur_nolb);
785
786 rc = target_xcopy_read_source(ec_cmd, xop, src_dev, src_lba, cur_nolb);
787 if (rc < 0)
788 goto out;
789
790 src_lba += cur_nolb;
791 pr_debug("target_xcopy_do_work: Incremented READ src_lba to %llu\n",
792 (unsigned long long)src_lba);
793
794 pr_debug("target_xcopy_do_work: Calling write dst_dev: %p dst_lba: %llu,"
795 " cur_nolb: %hu\n", dst_dev, (unsigned long long)dst_lba, cur_nolb);
796
797 rc = target_xcopy_write_destination(ec_cmd, xop, dst_dev,
798 dst_lba, cur_nolb);
799 if (rc < 0) {
800 transport_generic_free_cmd(&xop->src_pt_cmd->se_cmd, 0);
801 goto out;
802 }
803
804 dst_lba += cur_nolb;
805 pr_debug("target_xcopy_do_work: Incremented WRITE dst_lba to %llu\n",
806 (unsigned long long)dst_lba);
807
808 copied_nolb += cur_nolb;
809 nolb -= cur_nolb;
810
811 transport_generic_free_cmd(&xop->src_pt_cmd->se_cmd, 0);
812 xop->dst_pt_cmd->se_cmd.se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
813
814 transport_generic_free_cmd(&xop->dst_pt_cmd->se_cmd, 0);
815 }
816
817 xcopy_pt_undepend_remotedev(xop);
818 kfree(xop);
819
820 pr_debug("target_xcopy_do_work: Final src_lba: %llu, dst_lba: %llu\n",
821 (unsigned long long)src_lba, (unsigned long long)dst_lba);
822 pr_debug("target_xcopy_do_work: Blocks copied: %hu, Bytes Copied: %u\n",
823 copied_nolb, copied_nolb * dst_dev->dev_attrib.block_size);
824
825 pr_debug("target_xcopy_do_work: Setting X-COPY GOOD status -> sending response\n");
826 target_complete_cmd(ec_cmd, SAM_STAT_GOOD);
827 return;
828
829 out:
830 xcopy_pt_undepend_remotedev(xop);
831 kfree(xop);
832
833 pr_warn("target_xcopy_do_work: Setting X-COPY CHECK_CONDITION -> sending response\n");
834 ec_cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
835 target_complete_cmd(ec_cmd, SAM_STAT_CHECK_CONDITION);
836 }
837
838 sense_reason_t target_do_xcopy(struct se_cmd *se_cmd)
839 {
840 struct se_device *dev = se_cmd->se_dev;
841 struct xcopy_op *xop = NULL;
842 unsigned char *p = NULL, *seg_desc;
843 unsigned int list_id, list_id_usage, sdll, inline_dl, sa;
844 sense_reason_t ret = TCM_INVALID_PARAMETER_LIST;
845 int rc;
846 unsigned short tdll;
847
848 if (!dev->dev_attrib.emulate_3pc) {
849 pr_err("EXTENDED_COPY operation explicitly disabled\n");
850 return TCM_UNSUPPORTED_SCSI_OPCODE;
851 }
852
853 sa = se_cmd->t_task_cdb[1] & 0x1f;
854 if (sa != 0x00) {
855 pr_err("EXTENDED_COPY(LID4) not supported\n");
856 return TCM_UNSUPPORTED_SCSI_OPCODE;
857 }
858
859 xop = kzalloc(sizeof(struct xcopy_op), GFP_KERNEL);
860 if (!xop) {
861 pr_err("Unable to allocate xcopy_op\n");
862 return TCM_OUT_OF_RESOURCES;
863 }
864 xop->xop_se_cmd = se_cmd;
865
866 p = transport_kmap_data_sg(se_cmd);
867 if (!p) {
868 pr_err("transport_kmap_data_sg() failed in target_do_xcopy\n");
869 kfree(xop);
870 return TCM_OUT_OF_RESOURCES;
871 }
872
873 list_id = p[0];
874 list_id_usage = (p[1] & 0x18) >> 3;
875
876 /*
877 * Determine TARGET DESCRIPTOR LIST LENGTH + SEGMENT DESCRIPTOR LIST LENGTH
878 */
879 tdll = get_unaligned_be16(&p[2]);
880 sdll = get_unaligned_be32(&p[8]);
881
882 inline_dl = get_unaligned_be32(&p[12]);
883 if (inline_dl != 0) {
884 pr_err("XCOPY with non zero inline data length\n");
885 goto out;
886 }
887
888 pr_debug("Processing XCOPY with list_id: 0x%02x list_id_usage: 0x%02x"
889 " tdll: %hu sdll: %u inline_dl: %u\n", list_id, list_id_usage,
890 tdll, sdll, inline_dl);
891
892 rc = target_xcopy_parse_target_descriptors(se_cmd, xop, &p[16], tdll);
893 if (rc <= 0)
894 goto out;
895
896 if (xop->src_dev->dev_attrib.block_size !=
897 xop->dst_dev->dev_attrib.block_size) {
898 pr_err("XCOPY: Non matching src_dev block_size: %u + dst_dev"
899 " block_size: %u currently unsupported\n",
900 xop->src_dev->dev_attrib.block_size,
901 xop->dst_dev->dev_attrib.block_size);
902 xcopy_pt_undepend_remotedev(xop);
903 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
904 goto out;
905 }
906
907 pr_debug("XCOPY: Processed %d target descriptors, length: %u\n", rc,
908 rc * XCOPY_TARGET_DESC_LEN);
909 seg_desc = &p[16];
910 seg_desc += (rc * XCOPY_TARGET_DESC_LEN);
911
912 rc = target_xcopy_parse_segment_descriptors(se_cmd, xop, seg_desc, sdll);
913 if (rc <= 0) {
914 xcopy_pt_undepend_remotedev(xop);
915 goto out;
916 }
917 transport_kunmap_data_sg(se_cmd);
918
919 pr_debug("XCOPY: Processed %d segment descriptors, length: %u\n", rc,
920 rc * XCOPY_SEGMENT_DESC_LEN);
921 INIT_WORK(&xop->xop_work, target_xcopy_do_work);
922 queue_work(xcopy_wq, &xop->xop_work);
923 return TCM_NO_SENSE;
924
925 out:
926 if (p)
927 transport_kunmap_data_sg(se_cmd);
928 kfree(xop);
929 return ret;
930 }
931
932 static sense_reason_t target_rcr_operating_parameters(struct se_cmd *se_cmd)
933 {
934 unsigned char *p;
935
936 p = transport_kmap_data_sg(se_cmd);
937 if (!p) {
938 pr_err("transport_kmap_data_sg failed in"
939 " target_rcr_operating_parameters\n");
940 return TCM_OUT_OF_RESOURCES;
941 }
942
943 if (se_cmd->data_length < 54) {
944 pr_err("Receive Copy Results Op Parameters length"
945 " too small: %u\n", se_cmd->data_length);
946 transport_kunmap_data_sg(se_cmd);
947 return TCM_INVALID_CDB_FIELD;
948 }
949 /*
950 * Set SNLID=1 (Supports no List ID)
951 */
952 p[4] = 0x1;
953 /*
954 * MAXIMUM TARGET DESCRIPTOR COUNT
955 */
956 put_unaligned_be16(RCR_OP_MAX_TARGET_DESC_COUNT, &p[8]);
957 /*
958 * MAXIMUM SEGMENT DESCRIPTOR COUNT
959 */
960 put_unaligned_be16(RCR_OP_MAX_SG_DESC_COUNT, &p[10]);
961 /*
962 * MAXIMUM DESCRIPTOR LIST LENGTH
963 */
964 put_unaligned_be32(RCR_OP_MAX_DESC_LIST_LEN, &p[12]);
965 /*
966 * MAXIMUM SEGMENT LENGTH
967 */
968 put_unaligned_be32(RCR_OP_MAX_SEGMENT_LEN, &p[16]);
969 /*
970 * MAXIMUM INLINE DATA LENGTH for SA 0x04 (NOT SUPPORTED)
971 */
972 put_unaligned_be32(0x0, &p[20]);
973 /*
974 * HELD DATA LIMIT
975 */
976 put_unaligned_be32(0x0, &p[24]);
977 /*
978 * MAXIMUM STREAM DEVICE TRANSFER SIZE
979 */
980 put_unaligned_be32(0x0, &p[28]);
981 /*
982 * TOTAL CONCURRENT COPIES
983 */
984 put_unaligned_be16(RCR_OP_TOTAL_CONCURR_COPIES, &p[34]);
985 /*
986 * MAXIMUM CONCURRENT COPIES
987 */
988 p[36] = RCR_OP_MAX_CONCURR_COPIES;
989 /*
990 * DATA SEGMENT GRANULARITY (log 2)
991 */
992 p[37] = RCR_OP_DATA_SEG_GRAN_LOG2;
993 /*
994 * INLINE DATA GRANULARITY log 2)
995 */
996 p[38] = RCR_OP_INLINE_DATA_GRAN_LOG2;
997 /*
998 * HELD DATA GRANULARITY
999 */
1000 p[39] = RCR_OP_HELD_DATA_GRAN_LOG2;
1001 /*
1002 * IMPLEMENTED DESCRIPTOR LIST LENGTH
1003 */
1004 p[43] = 0x2;
1005 /*
1006 * List of implemented descriptor type codes (ordered)
1007 */
1008 p[44] = 0x02; /* Copy Block to Block device */
1009 p[45] = 0xe4; /* Identification descriptor target descriptor */
1010
1011 /*
1012 * AVAILABLE DATA (n-3)
1013 */
1014 put_unaligned_be32(42, &p[0]);
1015
1016 transport_kunmap_data_sg(se_cmd);
1017 target_complete_cmd(se_cmd, GOOD);
1018
1019 return TCM_NO_SENSE;
1020 }
1021
1022 sense_reason_t target_do_receive_copy_results(struct se_cmd *se_cmd)
1023 {
1024 unsigned char *cdb = &se_cmd->t_task_cdb[0];
1025 int sa = (cdb[1] & 0x1f), list_id = cdb[2];
1026 sense_reason_t rc = TCM_NO_SENSE;
1027
1028 pr_debug("Entering target_do_receive_copy_results: SA: 0x%02x, List ID:"
1029 " 0x%02x, AL: %u\n", sa, list_id, se_cmd->data_length);
1030
1031 if (list_id != 0) {
1032 pr_err("Receive Copy Results with non zero list identifier"
1033 " not supported\n");
1034 return TCM_INVALID_CDB_FIELD;
1035 }
1036
1037 switch (sa) {
1038 case RCR_SA_OPERATING_PARAMETERS:
1039 rc = target_rcr_operating_parameters(se_cmd);
1040 break;
1041 case RCR_SA_COPY_STATUS:
1042 case RCR_SA_RECEIVE_DATA:
1043 case RCR_SA_FAILED_SEGMENT_DETAILS:
1044 default:
1045 pr_err("Unsupported SA for receive copy results: 0x%02x\n", sa);
1046 return TCM_INVALID_CDB_FIELD;
1047 }
1048
1049 return rc;
1050 }
Linux kernel - Deliverables
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