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target: Minimize SCSI header #include directives
[linux/fpc-iii.git] / drivers / target / target_core_xcopy.c
blob7a4486a054fcc7fcad067e3f9e3febc0288c5a16
1 /*******************************************************************************
2 * Filename: target_core_xcopy.c
3 *
4 * This file contains support for SPC-4 Extended-Copy offload with generic
5 * TCM backends.
6 *
7 * Copyright (c) 2011-2013 Datera, Inc. All rights reserved.
8 *
9 * Author:
10 * Nicholas A. Bellinger <nab@daterainc.com>
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
16 *
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
21 *
22 ******************************************************************************/
23
24 #include <linux/slab.h>
25 #include <linux/spinlock.h>
26 #include <linux/list.h>
27 #include <linux/configfs.h>
28 #include <scsi/scsi_proto.h>
29 #include <asm/unaligned.h>
30
31 #include <target/target_core_base.h>
32 #include <target/target_core_backend.h>
33 #include <target/target_core_fabric.h>
34 #include <target/target_core_configfs.h>
35
36 #include "target_core_internal.h"
37 #include "target_core_pr.h"
38 #include "target_core_ua.h"
39 #include "target_core_xcopy.h"
40
41 static struct workqueue_struct *xcopy_wq = NULL;
42
43 static int target_xcopy_gen_naa_ieee(struct se_device *dev, unsigned char *buf)
44 {
45 int off = 0;
46
47 buf[off++] = (0x6 << 4);
48 buf[off++] = 0x01;
49 buf[off++] = 0x40;
50 buf[off] = (0x5 << 4);
51
52 spc_parse_naa_6h_vendor_specific(dev, &buf[off]);
53 return 0;
54 }
55
56 static int target_xcopy_locate_se_dev_e4(struct se_cmd *se_cmd, struct xcopy_op *xop,
57 bool src)
58 {
59 struct se_device *se_dev;
60 struct configfs_subsystem *subsys = target_core_subsystem[0];
61 unsigned char tmp_dev_wwn[XCOPY_NAA_IEEE_REGEX_LEN], *dev_wwn;
62 int rc;
63
64 if (src)
65 dev_wwn = &xop->dst_tid_wwn[0];
66 else
67 dev_wwn = &xop->src_tid_wwn[0];
68
69 mutex_lock(&g_device_mutex);
70 list_for_each_entry(se_dev, &g_device_list, g_dev_node) {
71
72 if (!se_dev->dev_attrib.emulate_3pc)
73 continue;
74
75 memset(&tmp_dev_wwn[0], 0, XCOPY_NAA_IEEE_REGEX_LEN);
76 target_xcopy_gen_naa_ieee(se_dev, &tmp_dev_wwn[0]);
77
78 rc = memcmp(&tmp_dev_wwn[0], dev_wwn, XCOPY_NAA_IEEE_REGEX_LEN);
79 if (rc != 0)
80 continue;
81
82 if (src) {
83 xop->dst_dev = se_dev;
84 pr_debug("XCOPY 0xe4: Setting xop->dst_dev: %p from located"
85 " se_dev\n", xop->dst_dev);
86 } else {
87 xop->src_dev = se_dev;
88 pr_debug("XCOPY 0xe4: Setting xop->src_dev: %p from located"
89 " se_dev\n", xop->src_dev);
90 }
91
92 rc = configfs_depend_item(subsys,
93 &se_dev->dev_group.cg_item);
94 if (rc != 0) {
95 pr_err("configfs_depend_item attempt failed:"
96 " %d for se_dev: %p\n", rc, se_dev);
97 mutex_unlock(&g_device_mutex);
98 return rc;
99 }
100
101 pr_debug("Called configfs_depend_item for subsys: %p se_dev: %p"
102 " se_dev->se_dev_group: %p\n", subsys, se_dev,
103 &se_dev->dev_group);
104
105 mutex_unlock(&g_device_mutex);
106 return 0;
107 }
108 mutex_unlock(&g_device_mutex);
109
110 pr_err("Unable to locate 0xe4 descriptor for EXTENDED_COPY\n");
111 return -EINVAL;
112 }
113
114 static int target_xcopy_parse_tiddesc_e4(struct se_cmd *se_cmd, struct xcopy_op *xop,
115 unsigned char *p, bool src)
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 (src) {
161 memcpy(&xop->src_tid_wwn[0], &desc[8], XCOPY_NAA_IEEE_REGEX_LEN);
162 /*
163 * Determine if the source designator matches the local device
164 */
165 if (!memcmp(&xop->local_dev_wwn[0], &xop->src_tid_wwn[0],
166 XCOPY_NAA_IEEE_REGEX_LEN)) {
167 xop->op_origin = XCOL_SOURCE_RECV_OP;
168 xop->src_dev = se_cmd->se_dev;
169 pr_debug("XCOPY 0xe4: Set xop->src_dev %p from source"
170 " received xop\n", xop->src_dev);
171 }
172 } else {
173 memcpy(&xop->dst_tid_wwn[0], &desc[8], XCOPY_NAA_IEEE_REGEX_LEN);
174 /*
175 * Determine if the destination designator matches the local device
176 */
177 if (!memcmp(&xop->local_dev_wwn[0], &xop->dst_tid_wwn[0],
178 XCOPY_NAA_IEEE_REGEX_LEN)) {
179 xop->op_origin = XCOL_DEST_RECV_OP;
180 xop->dst_dev = se_cmd->se_dev;
181 pr_debug("XCOPY 0xe4: Set xop->dst_dev: %p from destination"
182 " received xop\n", xop->dst_dev);
183 }
184 }
185
186 return 0;
187 }
188
189 static int target_xcopy_parse_target_descriptors(struct se_cmd *se_cmd,
190 struct xcopy_op *xop, unsigned char *p,
191 unsigned short tdll)
192 {
193 struct se_device *local_dev = se_cmd->se_dev;
194 unsigned char *desc = p;
195 int offset = tdll % XCOPY_TARGET_DESC_LEN, rc, ret = 0;
196 unsigned short start = 0;
197 bool src = true;
198
199 if (offset != 0) {
200 pr_err("XCOPY target descriptor list length is not"
201 " multiple of %d\n", XCOPY_TARGET_DESC_LEN);
202 return -EINVAL;
203 }
204 if (tdll > 64) {
205 pr_err("XCOPY target descriptor supports a maximum"
206 " two src/dest descriptors, tdll: %hu too large..\n", tdll);
207 return -EINVAL;
208 }
209 /*
210 * Generate an IEEE Registered Extended designator based upon the
211 * se_device the XCOPY was received upon..
212 */
213 memset(&xop->local_dev_wwn[0], 0, XCOPY_NAA_IEEE_REGEX_LEN);
214 target_xcopy_gen_naa_ieee(local_dev, &xop->local_dev_wwn[0]);
215
216 while (start < tdll) {
217 /*
218 * Check target descriptor identification with 0xE4 type with
219 * use VPD 0x83 WWPN matching ..
220 */
221 switch (desc[0]) {
222 case 0xe4:
223 rc = target_xcopy_parse_tiddesc_e4(se_cmd, xop,
224 &desc[0], src);
225 if (rc != 0)
226 goto out;
227 /*
228 * Assume target descriptors are in source -> destination order..
229 */
230 if (src)
231 src = false;
232 else
233 src = true;
234 start += XCOPY_TARGET_DESC_LEN;
235 desc += XCOPY_TARGET_DESC_LEN;
236 ret++;
237 break;
238 default:
239 pr_err("XCOPY unsupported descriptor type code:"
240 " 0x%02x\n", desc[0]);
241 goto out;
242 }
243 }
244
245 if (xop->op_origin == XCOL_SOURCE_RECV_OP)
246 rc = target_xcopy_locate_se_dev_e4(se_cmd, xop, true);
247 else
248 rc = target_xcopy_locate_se_dev_e4(se_cmd, xop, false);
249
250 if (rc < 0)
251 goto out;
252
253 pr_debug("XCOPY TGT desc: Source dev: %p NAA IEEE WWN: 0x%16phN\n",
254 xop->src_dev, &xop->src_tid_wwn[0]);
255 pr_debug("XCOPY TGT desc: Dest dev: %p NAA IEEE WWN: 0x%16phN\n",
256 xop->dst_dev, &xop->dst_tid_wwn[0]);
257
258 return ret;
259
260 out:
261 return -EINVAL;
262 }
263
264 static int target_xcopy_parse_segdesc_02(struct se_cmd *se_cmd, struct xcopy_op *xop,
265 unsigned char *p)
266 {
267 unsigned char *desc = p;
268 int dc = (desc[1] & 0x02);
269 unsigned short desc_len;
270
271 desc_len = get_unaligned_be16(&desc[2]);
272 if (desc_len != 0x18) {
273 pr_err("XCOPY segment desc 0x02: Illegal desc_len:"
274 " %hu\n", desc_len);
275 return -EINVAL;
276 }
277
278 xop->stdi = get_unaligned_be16(&desc[4]);
279 xop->dtdi = get_unaligned_be16(&desc[6]);
280 pr_debug("XCOPY seg desc 0x02: desc_len: %hu stdi: %hu dtdi: %hu, DC: %d\n",
281 desc_len, xop->stdi, xop->dtdi, dc);
282
283 xop->nolb = get_unaligned_be16(&desc[10]);
284 xop->src_lba = get_unaligned_be64(&desc[12]);
285 xop->dst_lba = get_unaligned_be64(&desc[20]);
286 pr_debug("XCOPY seg desc 0x02: nolb: %hu src_lba: %llu dst_lba: %llu\n",
287 xop->nolb, (unsigned long long)xop->src_lba,
288 (unsigned long long)xop->dst_lba);
289
290 if (dc != 0) {
291 xop->dbl = (desc[29] & 0xff) << 16;
292 xop->dbl |= (desc[30] & 0xff) << 8;
293 xop->dbl |= desc[31] & 0xff;
294
295 pr_debug("XCOPY seg desc 0x02: DC=1 w/ dbl: %u\n", xop->dbl);
296 }
297 return 0;
298 }
299
300 static int target_xcopy_parse_segment_descriptors(struct se_cmd *se_cmd,
301 struct xcopy_op *xop, unsigned char *p,
302 unsigned int sdll)
303 {
304 unsigned char *desc = p;
305 unsigned int start = 0;
306 int offset = sdll % XCOPY_SEGMENT_DESC_LEN, rc, ret = 0;
307
308 if (offset != 0) {
309 pr_err("XCOPY segment descriptor list length is not"
310 " multiple of %d\n", XCOPY_SEGMENT_DESC_LEN);
311 return -EINVAL;
312 }
313
314 while (start < sdll) {
315 /*
316 * Check segment descriptor type code for block -> block
317 */
318 switch (desc[0]) {
319 case 0x02:
320 rc = target_xcopy_parse_segdesc_02(se_cmd, xop, desc);
321 if (rc < 0)
322 goto out;
323
324 ret++;
325 start += XCOPY_SEGMENT_DESC_LEN;
326 desc += XCOPY_SEGMENT_DESC_LEN;
327 break;
328 default:
329 pr_err("XCOPY unsupported segment descriptor"
330 "type: 0x%02x\n", desc[0]);
331 goto out;
332 }
333 }
334
335 return ret;
336
337 out:
338 return -EINVAL;
339 }
340
341 /*
342 * Start xcopy_pt ops
343 */
344
345 struct xcopy_pt_cmd {
346 bool remote_port;
347 struct se_cmd se_cmd;
348 struct xcopy_op *xcopy_op;
349 struct completion xpt_passthrough_sem;
350 unsigned char sense_buffer[TRANSPORT_SENSE_BUFFER];
351 };
352
353 static struct se_port xcopy_pt_port;
354 static struct se_portal_group xcopy_pt_tpg;
355 static struct se_session xcopy_pt_sess;
356 static struct se_node_acl xcopy_pt_nacl;
357
358 static char *xcopy_pt_get_fabric_name(void)
359 {
360 return "xcopy-pt";
361 }
362
363 static u32 xcopy_pt_get_tag(struct se_cmd *se_cmd)
364 {
365 return 0;
366 }
367
368 static int xcopy_pt_get_cmd_state(struct se_cmd *se_cmd)
369 {
370 return 0;
371 }
372
373 static void xcopy_pt_undepend_remotedev(struct xcopy_op *xop)
374 {
375 struct configfs_subsystem *subsys = target_core_subsystem[0];
376 struct se_device *remote_dev;
377
378 if (xop->op_origin == XCOL_SOURCE_RECV_OP)
379 remote_dev = xop->dst_dev;
380 else
381 remote_dev = xop->src_dev;
382
383 pr_debug("Calling configfs_undepend_item for subsys: %p"
384 " remote_dev: %p remote_dev->dev_group: %p\n",
385 subsys, remote_dev, &remote_dev->dev_group.cg_item);
386
387 configfs_undepend_item(subsys, &remote_dev->dev_group.cg_item);
388 }
389
390 static void xcopy_pt_release_cmd(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 kfree(xpt_cmd);
396 }
397
398 static int xcopy_pt_check_stop_free(struct se_cmd *se_cmd)
399 {
400 struct xcopy_pt_cmd *xpt_cmd = container_of(se_cmd,
401 struct xcopy_pt_cmd, se_cmd);
402
403 complete(&xpt_cmd->xpt_passthrough_sem);
404 return 0;
405 }
406
407 static int xcopy_pt_write_pending(struct se_cmd *se_cmd)
408 {
409 return 0;
410 }
411
412 static int xcopy_pt_write_pending_status(struct se_cmd *se_cmd)
413 {
414 return 0;
415 }
416
417 static int xcopy_pt_queue_data_in(struct se_cmd *se_cmd)
418 {
419 return 0;
420 }
421
422 static int xcopy_pt_queue_status(struct se_cmd *se_cmd)
423 {
424 return 0;
425 }
426
427 static const struct target_core_fabric_ops xcopy_pt_tfo = {
428 .get_fabric_name = xcopy_pt_get_fabric_name,
429 .get_task_tag = xcopy_pt_get_tag,
430 .get_cmd_state = xcopy_pt_get_cmd_state,
431 .release_cmd = xcopy_pt_release_cmd,
432 .check_stop_free = xcopy_pt_check_stop_free,
433 .write_pending = xcopy_pt_write_pending,
434 .write_pending_status = xcopy_pt_write_pending_status,
435 .queue_data_in = xcopy_pt_queue_data_in,
436 .queue_status = xcopy_pt_queue_status,
437 };
438
439 /*
440 * End xcopy_pt_ops
441 */
442
443 int target_xcopy_setup_pt(void)
444 {
445 xcopy_wq = alloc_workqueue("xcopy_wq", WQ_MEM_RECLAIM, 0);
446 if (!xcopy_wq) {
447 pr_err("Unable to allocate xcopy_wq\n");
448 return -ENOMEM;
449 }
450
451 memset(&xcopy_pt_port, 0, sizeof(struct se_port));
452 INIT_LIST_HEAD(&xcopy_pt_port.sep_alua_list);
453 INIT_LIST_HEAD(&xcopy_pt_port.sep_list);
454 mutex_init(&xcopy_pt_port.sep_tg_pt_md_mutex);
455
456 memset(&xcopy_pt_tpg, 0, sizeof(struct se_portal_group));
457 INIT_LIST_HEAD(&xcopy_pt_tpg.se_tpg_node);
458 INIT_LIST_HEAD(&xcopy_pt_tpg.acl_node_list);
459 INIT_LIST_HEAD(&xcopy_pt_tpg.tpg_sess_list);
460
461 xcopy_pt_port.sep_tpg = &xcopy_pt_tpg;
462 xcopy_pt_tpg.se_tpg_tfo = &xcopy_pt_tfo;
463
464 memset(&xcopy_pt_nacl, 0, sizeof(struct se_node_acl));
465 INIT_LIST_HEAD(&xcopy_pt_nacl.acl_list);
466 INIT_LIST_HEAD(&xcopy_pt_nacl.acl_sess_list);
467 memset(&xcopy_pt_sess, 0, sizeof(struct se_session));
468 INIT_LIST_HEAD(&xcopy_pt_sess.sess_list);
469 INIT_LIST_HEAD(&xcopy_pt_sess.sess_acl_list);
470
471 xcopy_pt_nacl.se_tpg = &xcopy_pt_tpg;
472 xcopy_pt_nacl.nacl_sess = &xcopy_pt_sess;
473
474 xcopy_pt_sess.se_tpg = &xcopy_pt_tpg;
475 xcopy_pt_sess.se_node_acl = &xcopy_pt_nacl;
476
477 return 0;
478 }
479
480 void target_xcopy_release_pt(void)
481 {
482 if (xcopy_wq)
483 destroy_workqueue(xcopy_wq);
484 }
485
486 static void target_xcopy_setup_pt_port(
487 struct xcopy_pt_cmd *xpt_cmd,
488 struct xcopy_op *xop,
489 bool remote_port)
490 {
491 struct se_cmd *ec_cmd = xop->xop_se_cmd;
492 struct se_cmd *pt_cmd = &xpt_cmd->se_cmd;
493
494 if (xop->op_origin == XCOL_SOURCE_RECV_OP) {
495 /*
496 * Honor destination port reservations for X-COPY PUSH emulation
497 * when CDB is received on local source port, and READs blocks to
498 * WRITE on remote destination port.
499 */
500 if (remote_port) {
501 xpt_cmd->remote_port = remote_port;
502 pt_cmd->se_lun->lun_sep = &xcopy_pt_port;
503 pr_debug("Setup emulated remote DEST xcopy_pt_port: %p to"
504 " cmd->se_lun->lun_sep for X-COPY data PUSH\n",
505 pt_cmd->se_lun->lun_sep);
506 } else {
507 pt_cmd->se_lun = ec_cmd->se_lun;
508 pt_cmd->se_dev = ec_cmd->se_dev;
509
510 pr_debug("Honoring local SRC port from ec_cmd->se_dev:"
511 " %p\n", pt_cmd->se_dev);
512 pt_cmd->se_lun = ec_cmd->se_lun;
513 pr_debug("Honoring local SRC port from ec_cmd->se_lun: %p\n",
514 pt_cmd->se_lun);
515 }
516 } else {
517 /*
518 * Honor source port reservation for X-COPY PULL emulation
519 * when CDB is received on local desintation port, and READs
520 * blocks from the remote source port to WRITE on local
521 * destination port.
522 */
523 if (remote_port) {
524 xpt_cmd->remote_port = remote_port;
525 pt_cmd->se_lun->lun_sep = &xcopy_pt_port;
526 pr_debug("Setup emulated remote SRC xcopy_pt_port: %p to"
527 " cmd->se_lun->lun_sep for X-COPY data PULL\n",
528 pt_cmd->se_lun->lun_sep);
529 } else {
530 pt_cmd->se_lun = ec_cmd->se_lun;
531 pt_cmd->se_dev = ec_cmd->se_dev;
532
533 pr_debug("Honoring local DST port from ec_cmd->se_dev:"
534 " %p\n", pt_cmd->se_dev);
535 pt_cmd->se_lun = ec_cmd->se_lun;
536 pr_debug("Honoring local DST port from ec_cmd->se_lun: %p\n",
537 pt_cmd->se_lun);
538 }
539 }
540 }
541
542 static void target_xcopy_init_pt_lun(struct se_device *se_dev,
543 struct se_cmd *pt_cmd, bool remote_port)
544 {
545 /*
546 * Don't allocate + init an pt_cmd->se_lun if honoring local port for
547 * reservations. The pt_cmd->se_lun pointer will be setup from within
548 * target_xcopy_setup_pt_port()
549 */
550 if (remote_port) {
551 pr_debug("Setup emulated se_dev: %p from se_dev\n",
552 pt_cmd->se_dev);
553 pt_cmd->se_lun = &se_dev->xcopy_lun;
554 pt_cmd->se_dev = se_dev;
555 }
556
557 pt_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
558 }
559
560 static int target_xcopy_setup_pt_cmd(
561 struct xcopy_pt_cmd *xpt_cmd,
562 struct xcopy_op *xop,
563 struct se_device *se_dev,
564 unsigned char *cdb,
565 bool remote_port,
566 bool alloc_mem)
567 {
568 struct se_cmd *cmd = &xpt_cmd->se_cmd;
569 sense_reason_t sense_rc;
570 int ret = 0, rc;
571 /*
572 * Setup LUN+port to honor reservations based upon xop->op_origin for
573 * X-COPY PUSH or X-COPY PULL based upon where the CDB was received.
574 */
575 target_xcopy_init_pt_lun(se_dev, cmd, remote_port);
576
577 xpt_cmd->xcopy_op = xop;
578 target_xcopy_setup_pt_port(xpt_cmd, xop, remote_port);
579
580 sense_rc = target_setup_cmd_from_cdb(cmd, cdb);
581 if (sense_rc) {
582 ret = -EINVAL;
583 goto out;
584 }
585
586 if (alloc_mem) {
587 rc = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents,
588 cmd->data_length, false);
589 if (rc < 0) {
590 ret = rc;
591 goto out;
592 }
593 /*
594 * Set this bit so that transport_free_pages() allows the
595 * caller to release SGLs + physical memory allocated by
596 * transport_generic_get_mem()..
597 */
598 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
599 } else {
600 /*
601 * Here the previously allocated SGLs for the internal READ
602 * are mapped zero-copy to the internal WRITE.
603 */
604 sense_rc = transport_generic_map_mem_to_cmd(cmd,
605 xop->xop_data_sg, xop->xop_data_nents,
606 NULL, 0);
607 if (sense_rc) {
608 ret = -EINVAL;
609 goto out;
610 }
611
612 pr_debug("Setup PASSTHROUGH_NOALLOC t_data_sg: %p t_data_nents:"
613 " %u\n", cmd->t_data_sg, cmd->t_data_nents);
614 }
615
616 return 0;
617
618 out:
619 return ret;
620 }
621
622 static int target_xcopy_issue_pt_cmd(struct xcopy_pt_cmd *xpt_cmd)
623 {
624 struct se_cmd *se_cmd = &xpt_cmd->se_cmd;
625 sense_reason_t sense_rc;
626
627 sense_rc = transport_generic_new_cmd(se_cmd);
628 if (sense_rc)
629 return -EINVAL;
630
631 if (se_cmd->data_direction == DMA_TO_DEVICE)
632 target_execute_cmd(se_cmd);
633
634 wait_for_completion_interruptible(&xpt_cmd->xpt_passthrough_sem);
635
636 pr_debug("target_xcopy_issue_pt_cmd(): SCSI status: 0x%02x\n",
637 se_cmd->scsi_status);
638
639 return (se_cmd->scsi_status) ? -EINVAL : 0;
640 }
641
642 static int target_xcopy_read_source(
643 struct se_cmd *ec_cmd,
644 struct xcopy_op *xop,
645 struct se_device *src_dev,
646 sector_t src_lba,
647 u32 src_sectors)
648 {
649 struct xcopy_pt_cmd *xpt_cmd;
650 struct se_cmd *se_cmd;
651 u32 length = (src_sectors * src_dev->dev_attrib.block_size);
652 int rc;
653 unsigned char cdb[16];
654 bool remote_port = (xop->op_origin == XCOL_DEST_RECV_OP);
655
656 xpt_cmd = kzalloc(sizeof(struct xcopy_pt_cmd), GFP_KERNEL);
657 if (!xpt_cmd) {
658 pr_err("Unable to allocate xcopy_pt_cmd\n");
659 return -ENOMEM;
660 }
661 init_completion(&xpt_cmd->xpt_passthrough_sem);
662 se_cmd = &xpt_cmd->se_cmd;
663
664 memset(&cdb[0], 0, 16);
665 cdb[0] = READ_16;
666 put_unaligned_be64(src_lba, &cdb[2]);
667 put_unaligned_be32(src_sectors, &cdb[10]);
668 pr_debug("XCOPY: Built READ_16: LBA: %llu Sectors: %u Length: %u\n",
669 (unsigned long long)src_lba, src_sectors, length);
670
671 transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, NULL, length,
672 DMA_FROM_DEVICE, 0, &xpt_cmd->sense_buffer[0]);
673 xop->src_pt_cmd = xpt_cmd;
674
675 rc = target_xcopy_setup_pt_cmd(xpt_cmd, xop, src_dev, &cdb[0],
676 remote_port, true);
677 if (rc < 0) {
678 transport_generic_free_cmd(se_cmd, 0);
679 return rc;
680 }
681
682 xop->xop_data_sg = se_cmd->t_data_sg;
683 xop->xop_data_nents = se_cmd->t_data_nents;
684 pr_debug("XCOPY-READ: Saved xop->xop_data_sg: %p, num: %u for READ"
685 " memory\n", xop->xop_data_sg, xop->xop_data_nents);
686
687 rc = target_xcopy_issue_pt_cmd(xpt_cmd);
688 if (rc < 0) {
689 transport_generic_free_cmd(se_cmd, 0);
690 return rc;
691 }
692 /*
693 * Clear off the allocated t_data_sg, that has been saved for
694 * zero-copy WRITE submission reuse in struct xcopy_op..
695 */
696 se_cmd->t_data_sg = NULL;
697 se_cmd->t_data_nents = 0;
698
699 return 0;
700 }
701
702 static int target_xcopy_write_destination(
703 struct se_cmd *ec_cmd,
704 struct xcopy_op *xop,
705 struct se_device *dst_dev,
706 sector_t dst_lba,
707 u32 dst_sectors)
708 {
709 struct xcopy_pt_cmd *xpt_cmd;
710 struct se_cmd *se_cmd;
711 u32 length = (dst_sectors * dst_dev->dev_attrib.block_size);
712 int rc;
713 unsigned char cdb[16];
714 bool remote_port = (xop->op_origin == XCOL_SOURCE_RECV_OP);
715
716 xpt_cmd = kzalloc(sizeof(struct xcopy_pt_cmd), GFP_KERNEL);
717 if (!xpt_cmd) {
718 pr_err("Unable to allocate xcopy_pt_cmd\n");
719 return -ENOMEM;
720 }
721 init_completion(&xpt_cmd->xpt_passthrough_sem);
722 se_cmd = &xpt_cmd->se_cmd;
723
724 memset(&cdb[0], 0, 16);
725 cdb[0] = WRITE_16;
726 put_unaligned_be64(dst_lba, &cdb[2]);
727 put_unaligned_be32(dst_sectors, &cdb[10]);
728 pr_debug("XCOPY: Built WRITE_16: LBA: %llu Sectors: %u Length: %u\n",
729 (unsigned long long)dst_lba, dst_sectors, length);
730
731 transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, NULL, length,
732 DMA_TO_DEVICE, 0, &xpt_cmd->sense_buffer[0]);
733 xop->dst_pt_cmd = xpt_cmd;
734
735 rc = target_xcopy_setup_pt_cmd(xpt_cmd, xop, dst_dev, &cdb[0],
736 remote_port, false);
737 if (rc < 0) {
738 struct se_cmd *src_cmd = &xop->src_pt_cmd->se_cmd;
739 /*
740 * If the failure happened before the t_mem_list hand-off in
741 * target_xcopy_setup_pt_cmd(), Reset memory + clear flag so that
742 * core releases this memory on error during X-COPY WRITE I/O.
743 */
744 src_cmd->se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
745 src_cmd->t_data_sg = xop->xop_data_sg;
746 src_cmd->t_data_nents = xop->xop_data_nents;
747
748 transport_generic_free_cmd(se_cmd, 0);
749 return rc;
750 }
751
752 rc = target_xcopy_issue_pt_cmd(xpt_cmd);
753 if (rc < 0) {
754 se_cmd->se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
755 transport_generic_free_cmd(se_cmd, 0);
756 return rc;
757 }
758
759 return 0;
760 }
761
762 static void target_xcopy_do_work(struct work_struct *work)
763 {
764 struct xcopy_op *xop = container_of(work, struct xcopy_op, xop_work);
765 struct se_device *src_dev = xop->src_dev, *dst_dev = xop->dst_dev;
766 struct se_cmd *ec_cmd = xop->xop_se_cmd;
767 sector_t src_lba = xop->src_lba, dst_lba = xop->dst_lba, end_lba;
768 unsigned int max_sectors;
769 int rc;
770 unsigned short nolb = xop->nolb, cur_nolb, max_nolb, copied_nolb = 0;
771
772 end_lba = src_lba + nolb;
773 /*
774 * Break up XCOPY I/O into hw_max_sectors sized I/O based on the
775 * smallest max_sectors between src_dev + dev_dev, or
776 */
777 max_sectors = min(src_dev->dev_attrib.hw_max_sectors,
778 dst_dev->dev_attrib.hw_max_sectors);
779 max_sectors = min_t(u32, max_sectors, XCOPY_MAX_SECTORS);
780
781 max_nolb = min_t(u16, max_sectors, ((u16)(~0U)));
782
783 pr_debug("target_xcopy_do_work: nolb: %hu, max_nolb: %hu end_lba: %llu\n",
784 nolb, max_nolb, (unsigned long long)end_lba);
785 pr_debug("target_xcopy_do_work: Starting src_lba: %llu, dst_lba: %llu\n",
786 (unsigned long long)src_lba, (unsigned long long)dst_lba);
787
788 while (src_lba < end_lba) {
789 cur_nolb = min(nolb, max_nolb);
790
791 pr_debug("target_xcopy_do_work: Calling read src_dev: %p src_lba: %llu,"
792 " cur_nolb: %hu\n", src_dev, (unsigned long long)src_lba, cur_nolb);
793
794 rc = target_xcopy_read_source(ec_cmd, xop, src_dev, src_lba, cur_nolb);
795 if (rc < 0)
796 goto out;
797
798 src_lba += cur_nolb;
799 pr_debug("target_xcopy_do_work: Incremented READ src_lba to %llu\n",
800 (unsigned long long)src_lba);
801
802 pr_debug("target_xcopy_do_work: Calling write dst_dev: %p dst_lba: %llu,"
803 " cur_nolb: %hu\n", dst_dev, (unsigned long long)dst_lba, cur_nolb);
804
805 rc = target_xcopy_write_destination(ec_cmd, xop, dst_dev,
806 dst_lba, cur_nolb);
807 if (rc < 0) {
808 transport_generic_free_cmd(&xop->src_pt_cmd->se_cmd, 0);
809 goto out;
810 }
811
812 dst_lba += cur_nolb;
813 pr_debug("target_xcopy_do_work: Incremented WRITE dst_lba to %llu\n",
814 (unsigned long long)dst_lba);
815
816 copied_nolb += cur_nolb;
817 nolb -= cur_nolb;
818
819 transport_generic_free_cmd(&xop->src_pt_cmd->se_cmd, 0);
820 xop->dst_pt_cmd->se_cmd.se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
821
822 transport_generic_free_cmd(&xop->dst_pt_cmd->se_cmd, 0);
823 }
824
825 xcopy_pt_undepend_remotedev(xop);
826 kfree(xop);
827
828 pr_debug("target_xcopy_do_work: Final src_lba: %llu, dst_lba: %llu\n",
829 (unsigned long long)src_lba, (unsigned long long)dst_lba);
830 pr_debug("target_xcopy_do_work: Blocks copied: %hu, Bytes Copied: %u\n",
831 copied_nolb, copied_nolb * dst_dev->dev_attrib.block_size);
832
833 pr_debug("target_xcopy_do_work: Setting X-COPY GOOD status -> sending response\n");
834 target_complete_cmd(ec_cmd, SAM_STAT_GOOD);
835 return;
836
837 out:
838 xcopy_pt_undepend_remotedev(xop);
839 kfree(xop);
840
841 pr_warn("target_xcopy_do_work: Setting X-COPY CHECK_CONDITION -> sending response\n");
842 ec_cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
843 target_complete_cmd(ec_cmd, SAM_STAT_CHECK_CONDITION);
844 }
845
846 sense_reason_t target_do_xcopy(struct se_cmd *se_cmd)
847 {
848 struct se_device *dev = se_cmd->se_dev;
849 struct xcopy_op *xop = NULL;
850 unsigned char *p = NULL, *seg_desc;
851 unsigned int list_id, list_id_usage, sdll, inline_dl, sa;
852 sense_reason_t ret = TCM_INVALID_PARAMETER_LIST;
853 int rc;
854 unsigned short tdll;
855
856 if (!dev->dev_attrib.emulate_3pc) {
857 pr_err("EXTENDED_COPY operation explicitly disabled\n");
858 return TCM_UNSUPPORTED_SCSI_OPCODE;
859 }
860
861 sa = se_cmd->t_task_cdb[1] & 0x1f;
862 if (sa != 0x00) {
863 pr_err("EXTENDED_COPY(LID4) not supported\n");
864 return TCM_UNSUPPORTED_SCSI_OPCODE;
865 }
866
867 xop = kzalloc(sizeof(struct xcopy_op), GFP_KERNEL);
868 if (!xop) {
869 pr_err("Unable to allocate xcopy_op\n");
870 return TCM_OUT_OF_RESOURCES;
871 }
872 xop->xop_se_cmd = se_cmd;
873
874 p = transport_kmap_data_sg(se_cmd);
875 if (!p) {
876 pr_err("transport_kmap_data_sg() failed in target_do_xcopy\n");
877 kfree(xop);
878 return TCM_OUT_OF_RESOURCES;
879 }
880
881 list_id = p[0];
882 list_id_usage = (p[1] & 0x18) >> 3;
883
884 /*
885 * Determine TARGET DESCRIPTOR LIST LENGTH + SEGMENT DESCRIPTOR LIST LENGTH
886 */
887 tdll = get_unaligned_be16(&p[2]);
888 sdll = get_unaligned_be32(&p[8]);
889
890 inline_dl = get_unaligned_be32(&p[12]);
891 if (inline_dl != 0) {
892 pr_err("XCOPY with non zero inline data length\n");
893 goto out;
894 }
895
896 pr_debug("Processing XCOPY with list_id: 0x%02x list_id_usage: 0x%02x"
897 " tdll: %hu sdll: %u inline_dl: %u\n", list_id, list_id_usage,
898 tdll, sdll, inline_dl);
899
900 rc = target_xcopy_parse_target_descriptors(se_cmd, xop, &p[16], tdll);
901 if (rc <= 0)
902 goto out;
903
904 if (xop->src_dev->dev_attrib.block_size !=
905 xop->dst_dev->dev_attrib.block_size) {
906 pr_err("XCOPY: Non matching src_dev block_size: %u + dst_dev"
907 " block_size: %u currently unsupported\n",
908 xop->src_dev->dev_attrib.block_size,
909 xop->dst_dev->dev_attrib.block_size);
910 xcopy_pt_undepend_remotedev(xop);
911 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
912 goto out;
913 }
914
915 pr_debug("XCOPY: Processed %d target descriptors, length: %u\n", rc,
916 rc * XCOPY_TARGET_DESC_LEN);
917 seg_desc = &p[16];
918 seg_desc += (rc * XCOPY_TARGET_DESC_LEN);
919
920 rc = target_xcopy_parse_segment_descriptors(se_cmd, xop, seg_desc, sdll);
921 if (rc <= 0) {
922 xcopy_pt_undepend_remotedev(xop);
923 goto out;
924 }
925 transport_kunmap_data_sg(se_cmd);
926
927 pr_debug("XCOPY: Processed %d segment descriptors, length: %u\n", rc,
928 rc * XCOPY_SEGMENT_DESC_LEN);
929 INIT_WORK(&xop->xop_work, target_xcopy_do_work);
930 queue_work(xcopy_wq, &xop->xop_work);
931 return TCM_NO_SENSE;
932
933 out:
934 if (p)
935 transport_kunmap_data_sg(se_cmd);
936 kfree(xop);
937 return ret;
938 }
939
940 static sense_reason_t target_rcr_operating_parameters(struct se_cmd *se_cmd)
941 {
942 unsigned char *p;
943
944 p = transport_kmap_data_sg(se_cmd);
945 if (!p) {
946 pr_err("transport_kmap_data_sg failed in"
947 " target_rcr_operating_parameters\n");
948 return TCM_OUT_OF_RESOURCES;
949 }
950
951 if (se_cmd->data_length < 54) {
952 pr_err("Receive Copy Results Op Parameters length"
953 " too small: %u\n", se_cmd->data_length);
954 transport_kunmap_data_sg(se_cmd);
955 return TCM_INVALID_CDB_FIELD;
956 }
957 /*
958 * Set SNLID=1 (Supports no List ID)
959 */
960 p[4] = 0x1;
961 /*
962 * MAXIMUM TARGET DESCRIPTOR COUNT
963 */
964 put_unaligned_be16(RCR_OP_MAX_TARGET_DESC_COUNT, &p[8]);
965 /*
966 * MAXIMUM SEGMENT DESCRIPTOR COUNT
967 */
968 put_unaligned_be16(RCR_OP_MAX_SG_DESC_COUNT, &p[10]);
969 /*
970 * MAXIMUM DESCRIPTOR LIST LENGTH
971 */
972 put_unaligned_be32(RCR_OP_MAX_DESC_LIST_LEN, &p[12]);
973 /*
974 * MAXIMUM SEGMENT LENGTH
975 */
976 put_unaligned_be32(RCR_OP_MAX_SEGMENT_LEN, &p[16]);
977 /*
978 * MAXIMUM INLINE DATA LENGTH for SA 0x04 (NOT SUPPORTED)
979 */
980 put_unaligned_be32(0x0, &p[20]);
981 /*
982 * HELD DATA LIMIT
983 */
984 put_unaligned_be32(0x0, &p[24]);
985 /*
986 * MAXIMUM STREAM DEVICE TRANSFER SIZE
987 */
988 put_unaligned_be32(0x0, &p[28]);
989 /*
990 * TOTAL CONCURRENT COPIES
991 */
992 put_unaligned_be16(RCR_OP_TOTAL_CONCURR_COPIES, &p[34]);
993 /*
994 * MAXIMUM CONCURRENT COPIES
995 */
996 p[36] = RCR_OP_MAX_CONCURR_COPIES;
997 /*
998 * DATA SEGMENT GRANULARITY (log 2)
999 */
1000 p[37] = RCR_OP_DATA_SEG_GRAN_LOG2;
1001 /*
1002 * INLINE DATA GRANULARITY log 2)
1003 */
1004 p[38] = RCR_OP_INLINE_DATA_GRAN_LOG2;
1005 /*
1006 * HELD DATA GRANULARITY
1007 */
1008 p[39] = RCR_OP_HELD_DATA_GRAN_LOG2;
1009 /*
1010 * IMPLEMENTED DESCRIPTOR LIST LENGTH
1011 */
1012 p[43] = 0x2;
1013 /*
1014 * List of implemented descriptor type codes (ordered)
1015 */
1016 p[44] = 0x02; /* Copy Block to Block device */
1017 p[45] = 0xe4; /* Identification descriptor target descriptor */
1018
1019 /*
1020 * AVAILABLE DATA (n-3)
1021 */
1022 put_unaligned_be32(42, &p[0]);
1023
1024 transport_kunmap_data_sg(se_cmd);
1025 target_complete_cmd(se_cmd, GOOD);
1026
1027 return TCM_NO_SENSE;
1028 }
1029
1030 sense_reason_t target_do_receive_copy_results(struct se_cmd *se_cmd)
1031 {
1032 unsigned char *cdb = &se_cmd->t_task_cdb[0];
1033 int sa = (cdb[1] & 0x1f), list_id = cdb[2];
1034 sense_reason_t rc = TCM_NO_SENSE;
1035
1036 pr_debug("Entering target_do_receive_copy_results: SA: 0x%02x, List ID:"
1037 " 0x%02x, AL: %u\n", sa, list_id, se_cmd->data_length);
1038
1039 if (list_id != 0) {
1040 pr_err("Receive Copy Results with non zero list identifier"
1041 " not supported\n");
1042 return TCM_INVALID_CDB_FIELD;
1043 }
1044
1045 switch (sa) {
1046 case RCR_SA_OPERATING_PARAMETERS:
1047 rc = target_rcr_operating_parameters(se_cmd);
1048 break;
1049 case RCR_SA_COPY_STATUS:
1050 case RCR_SA_RECEIVE_DATA:
1051 case RCR_SA_FAILED_SEGMENT_DETAILS:
1052 default:
1053 pr_err("Unsupported SA for receive copy results: 0x%02x\n", sa);
1054 return TCM_INVALID_CDB_FIELD;
1055 }
1056
1057 return rc;
1058 }
Linux with added FPC-III support