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staging: rtl8188eu: remove unused members from struct recv_priv
[linux/fpc-iii.git] / drivers / target / target_core_xcopy.c
blob37d5caebffa6b593025a28b703a54a71e7d940d3
1 /*******************************************************************************
2 * Filename: target_core_xcopy.c
3 *
4 * This file contains support for SPC-4 Extended-Copy offload with generic
5 * TCM backends.
6 *
7 * Copyright (c) 2011-2013 Datera, Inc. All rights reserved.
8 *
9 * Author:
10 * Nicholas A. Bellinger <nab@daterainc.com>
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
16 *
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
21 *
22 ******************************************************************************/
23
24 #include <linux/slab.h>
25 #include <linux/spinlock.h>
26 #include <linux/list.h>
27 #include <linux/configfs.h>
28 #include <linux/ratelimit.h>
29 #include <scsi/scsi_proto.h>
30 #include <asm/unaligned.h>
31
32 #include <target/target_core_base.h>
33 #include <target/target_core_backend.h>
34 #include <target/target_core_fabric.h>
35
36 #include "target_core_internal.h"
37 #include "target_core_pr.h"
38 #include "target_core_ua.h"
39 #include "target_core_xcopy.h"
40
41 static struct workqueue_struct *xcopy_wq = NULL;
42
43 static 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_debug_ratelimited("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, sense_reason_t *sense_ret)
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 *sense_ret = TCM_INVALID_PARAMETER_LIST;
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 a matching IEEE NAA 0x83 descriptor for the requested device
251 * is not located on this node, return COPY_ABORTED with ASQ/ASQC
252 * 0x0d/0x02 - COPY_TARGET_DEVICE_NOT_REACHABLE to request the
253 * initiator to fall back to normal copy method.
254 */
255 if (rc < 0) {
256 *sense_ret = TCM_COPY_TARGET_DEVICE_NOT_REACHABLE;
257 goto out;
258 }
259
260 pr_debug("XCOPY TGT desc: Source dev: %p NAA IEEE WWN: 0x%16phN\n",
261 xop->src_dev, &xop->src_tid_wwn[0]);
262 pr_debug("XCOPY TGT desc: Dest dev: %p NAA IEEE WWN: 0x%16phN\n",
263 xop->dst_dev, &xop->dst_tid_wwn[0]);
264
265 return ret;
266
267 out:
268 return -EINVAL;
269 }
270
271 static int target_xcopy_parse_segdesc_02(struct se_cmd *se_cmd, struct xcopy_op *xop,
272 unsigned char *p)
273 {
274 unsigned char *desc = p;
275 int dc = (desc[1] & 0x02);
276 unsigned short desc_len;
277
278 desc_len = get_unaligned_be16(&desc[2]);
279 if (desc_len != 0x18) {
280 pr_err("XCOPY segment desc 0x02: Illegal desc_len:"
281 " %hu\n", desc_len);
282 return -EINVAL;
283 }
284
285 xop->stdi = get_unaligned_be16(&desc[4]);
286 xop->dtdi = get_unaligned_be16(&desc[6]);
287 pr_debug("XCOPY seg desc 0x02: desc_len: %hu stdi: %hu dtdi: %hu, DC: %d\n",
288 desc_len, xop->stdi, xop->dtdi, dc);
289
290 xop->nolb = get_unaligned_be16(&desc[10]);
291 xop->src_lba = get_unaligned_be64(&desc[12]);
292 xop->dst_lba = get_unaligned_be64(&desc[20]);
293 pr_debug("XCOPY seg desc 0x02: nolb: %hu src_lba: %llu dst_lba: %llu\n",
294 xop->nolb, (unsigned long long)xop->src_lba,
295 (unsigned long long)xop->dst_lba);
296
297 if (dc != 0) {
298 xop->dbl = (desc[29] & 0xff) << 16;
299 xop->dbl |= (desc[30] & 0xff) << 8;
300 xop->dbl |= desc[31] & 0xff;
301
302 pr_debug("XCOPY seg desc 0x02: DC=1 w/ dbl: %u\n", xop->dbl);
303 }
304 return 0;
305 }
306
307 static int target_xcopy_parse_segment_descriptors(struct se_cmd *se_cmd,
308 struct xcopy_op *xop, unsigned char *p,
309 unsigned int sdll)
310 {
311 unsigned char *desc = p;
312 unsigned int start = 0;
313 int offset = sdll % XCOPY_SEGMENT_DESC_LEN, rc, ret = 0;
314
315 if (offset != 0) {
316 pr_err("XCOPY segment descriptor list length is not"
317 " multiple of %d\n", XCOPY_SEGMENT_DESC_LEN);
318 return -EINVAL;
319 }
320
321 while (start < sdll) {
322 /*
323 * Check segment descriptor type code for block -> block
324 */
325 switch (desc[0]) {
326 case 0x02:
327 rc = target_xcopy_parse_segdesc_02(se_cmd, xop, desc);
328 if (rc < 0)
329 goto out;
330
331 ret++;
332 start += XCOPY_SEGMENT_DESC_LEN;
333 desc += XCOPY_SEGMENT_DESC_LEN;
334 break;
335 default:
336 pr_err("XCOPY unsupported segment descriptor"
337 "type: 0x%02x\n", desc[0]);
338 goto out;
339 }
340 }
341
342 return ret;
343
344 out:
345 return -EINVAL;
346 }
347
348 /*
349 * Start xcopy_pt ops
350 */
351
352 struct xcopy_pt_cmd {
353 bool remote_port;
354 struct se_cmd se_cmd;
355 struct xcopy_op *xcopy_op;
356 struct completion xpt_passthrough_sem;
357 unsigned char sense_buffer[TRANSPORT_SENSE_BUFFER];
358 };
359
360 struct se_portal_group xcopy_pt_tpg;
361 static struct se_session xcopy_pt_sess;
362 static struct se_node_acl xcopy_pt_nacl;
363
364 static char *xcopy_pt_get_fabric_name(void)
365 {
366 return "xcopy-pt";
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 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"
384 " remote_dev: %p remote_dev->dev_group: %p\n",
385 remote_dev, &remote_dev->dev_group.cg_item);
386
387 target_undepend_item(&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_cmd_state = xcopy_pt_get_cmd_state,
430 .release_cmd = xcopy_pt_release_cmd,
431 .check_stop_free = xcopy_pt_check_stop_free,
432 .write_pending = xcopy_pt_write_pending,
433 .write_pending_status = xcopy_pt_write_pending_status,
434 .queue_data_in = xcopy_pt_queue_data_in,
435 .queue_status = xcopy_pt_queue_status,
436 };
437
438 /*
439 * End xcopy_pt_ops
440 */
441
442 int target_xcopy_setup_pt(void)
443 {
444 xcopy_wq = alloc_workqueue("xcopy_wq", WQ_MEM_RECLAIM, 0);
445 if (!xcopy_wq) {
446 pr_err("Unable to allocate xcopy_wq\n");
447 return -ENOMEM;
448 }
449
450 memset(&xcopy_pt_tpg, 0, sizeof(struct se_portal_group));
451 INIT_LIST_HEAD(&xcopy_pt_tpg.se_tpg_node);
452 INIT_LIST_HEAD(&xcopy_pt_tpg.acl_node_list);
453 INIT_LIST_HEAD(&xcopy_pt_tpg.tpg_sess_list);
454
455 xcopy_pt_tpg.se_tpg_tfo = &xcopy_pt_tfo;
456
457 memset(&xcopy_pt_nacl, 0, sizeof(struct se_node_acl));
458 INIT_LIST_HEAD(&xcopy_pt_nacl.acl_list);
459 INIT_LIST_HEAD(&xcopy_pt_nacl.acl_sess_list);
460 memset(&xcopy_pt_sess, 0, sizeof(struct se_session));
461 INIT_LIST_HEAD(&xcopy_pt_sess.sess_list);
462 INIT_LIST_HEAD(&xcopy_pt_sess.sess_acl_list);
463 INIT_LIST_HEAD(&xcopy_pt_sess.sess_cmd_list);
464 spin_lock_init(&xcopy_pt_sess.sess_cmd_lock);
465
466 xcopy_pt_nacl.se_tpg = &xcopy_pt_tpg;
467 xcopy_pt_nacl.nacl_sess = &xcopy_pt_sess;
468
469 xcopy_pt_sess.se_tpg = &xcopy_pt_tpg;
470 xcopy_pt_sess.se_node_acl = &xcopy_pt_nacl;
471
472 return 0;
473 }
474
475 void target_xcopy_release_pt(void)
476 {
477 if (xcopy_wq)
478 destroy_workqueue(xcopy_wq);
479 }
480
481 static void target_xcopy_setup_pt_port(
482 struct xcopy_pt_cmd *xpt_cmd,
483 struct xcopy_op *xop,
484 bool remote_port)
485 {
486 struct se_cmd *ec_cmd = xop->xop_se_cmd;
487 struct se_cmd *pt_cmd = &xpt_cmd->se_cmd;
488
489 if (xop->op_origin == XCOL_SOURCE_RECV_OP) {
490 /*
491 * Honor destination port reservations for X-COPY PUSH emulation
492 * when CDB is received on local source port, and READs blocks to
493 * WRITE on remote destination port.
494 */
495 if (remote_port) {
496 xpt_cmd->remote_port = remote_port;
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 } else {
517 pt_cmd->se_lun = ec_cmd->se_lun;
518 pt_cmd->se_dev = ec_cmd->se_dev;
519
520 pr_debug("Honoring local DST port from ec_cmd->se_dev:"
521 " %p\n", pt_cmd->se_dev);
522 pt_cmd->se_lun = ec_cmd->se_lun;
523 pr_debug("Honoring local DST port from ec_cmd->se_lun: %p\n",
524 pt_cmd->se_lun);
525 }
526 }
527 }
528
529 static void target_xcopy_init_pt_lun(struct se_device *se_dev,
530 struct se_cmd *pt_cmd, bool remote_port)
531 {
532 /*
533 * Don't allocate + init an pt_cmd->se_lun if honoring local port for
534 * reservations. The pt_cmd->se_lun pointer will be setup from within
535 * target_xcopy_setup_pt_port()
536 */
537 if (remote_port) {
538 pr_debug("Setup emulated se_dev: %p from se_dev\n",
539 pt_cmd->se_dev);
540 pt_cmd->se_lun = &se_dev->xcopy_lun;
541 pt_cmd->se_dev = se_dev;
542 }
543
544 pt_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
545 }
546
547 static int target_xcopy_setup_pt_cmd(
548 struct xcopy_pt_cmd *xpt_cmd,
549 struct xcopy_op *xop,
550 struct se_device *se_dev,
551 unsigned char *cdb,
552 bool remote_port,
553 bool alloc_mem)
554 {
555 struct se_cmd *cmd = &xpt_cmd->se_cmd;
556 sense_reason_t sense_rc;
557 int ret = 0, rc;
558 /*
559 * Setup LUN+port to honor reservations based upon xop->op_origin for
560 * X-COPY PUSH or X-COPY PULL based upon where the CDB was received.
561 */
562 target_xcopy_init_pt_lun(se_dev, cmd, remote_port);
563
564 xpt_cmd->xcopy_op = xop;
565 target_xcopy_setup_pt_port(xpt_cmd, xop, remote_port);
566
567 cmd->tag = 0;
568 sense_rc = target_setup_cmd_from_cdb(cmd, cdb);
569 if (sense_rc) {
570 ret = -EINVAL;
571 goto out;
572 }
573
574 if (alloc_mem) {
575 rc = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents,
576 cmd->data_length, false, false);
577 if (rc < 0) {
578 ret = rc;
579 goto out;
580 }
581 /*
582 * Set this bit so that transport_free_pages() allows the
583 * caller to release SGLs + physical memory allocated by
584 * transport_generic_get_mem()..
585 */
586 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
587 } else {
588 /*
589 * Here the previously allocated SGLs for the internal READ
590 * are mapped zero-copy to the internal WRITE.
591 */
592 sense_rc = transport_generic_map_mem_to_cmd(cmd,
593 xop->xop_data_sg, xop->xop_data_nents,
594 NULL, 0);
595 if (sense_rc) {
596 ret = -EINVAL;
597 goto out;
598 }
599
600 pr_debug("Setup PASSTHROUGH_NOALLOC t_data_sg: %p t_data_nents:"
601 " %u\n", cmd->t_data_sg, cmd->t_data_nents);
602 }
603
604 return 0;
605
606 out:
607 return ret;
608 }
609
610 static int target_xcopy_issue_pt_cmd(struct xcopy_pt_cmd *xpt_cmd)
611 {
612 struct se_cmd *se_cmd = &xpt_cmd->se_cmd;
613 sense_reason_t sense_rc;
614
615 sense_rc = transport_generic_new_cmd(se_cmd);
616 if (sense_rc)
617 return -EINVAL;
618
619 if (se_cmd->data_direction == DMA_TO_DEVICE)
620 target_execute_cmd(se_cmd);
621
622 wait_for_completion_interruptible(&xpt_cmd->xpt_passthrough_sem);
623
624 pr_debug("target_xcopy_issue_pt_cmd(): SCSI status: 0x%02x\n",
625 se_cmd->scsi_status);
626
627 return (se_cmd->scsi_status) ? -EINVAL : 0;
628 }
629
630 static int target_xcopy_read_source(
631 struct se_cmd *ec_cmd,
632 struct xcopy_op *xop,
633 struct se_device *src_dev,
634 sector_t src_lba,
635 u32 src_sectors)
636 {
637 struct xcopy_pt_cmd *xpt_cmd;
638 struct se_cmd *se_cmd;
639 u32 length = (src_sectors * src_dev->dev_attrib.block_size);
640 int rc;
641 unsigned char cdb[16];
642 bool remote_port = (xop->op_origin == XCOL_DEST_RECV_OP);
643
644 xpt_cmd = kzalloc(sizeof(struct xcopy_pt_cmd), GFP_KERNEL);
645 if (!xpt_cmd) {
646 pr_err("Unable to allocate xcopy_pt_cmd\n");
647 return -ENOMEM;
648 }
649 init_completion(&xpt_cmd->xpt_passthrough_sem);
650 se_cmd = &xpt_cmd->se_cmd;
651
652 memset(&cdb[0], 0, 16);
653 cdb[0] = READ_16;
654 put_unaligned_be64(src_lba, &cdb[2]);
655 put_unaligned_be32(src_sectors, &cdb[10]);
656 pr_debug("XCOPY: Built READ_16: LBA: %llu Sectors: %u Length: %u\n",
657 (unsigned long long)src_lba, src_sectors, length);
658
659 transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, &xcopy_pt_sess, length,
660 DMA_FROM_DEVICE, 0, &xpt_cmd->sense_buffer[0]);
661 xop->src_pt_cmd = xpt_cmd;
662
663 rc = target_xcopy_setup_pt_cmd(xpt_cmd, xop, src_dev, &cdb[0],
664 remote_port, true);
665 if (rc < 0) {
666 ec_cmd->scsi_status = xpt_cmd->se_cmd.scsi_status;
667 transport_generic_free_cmd(se_cmd, 0);
668 return rc;
669 }
670
671 xop->xop_data_sg = se_cmd->t_data_sg;
672 xop->xop_data_nents = se_cmd->t_data_nents;
673 pr_debug("XCOPY-READ: Saved xop->xop_data_sg: %p, num: %u for READ"
674 " memory\n", xop->xop_data_sg, xop->xop_data_nents);
675
676 rc = target_xcopy_issue_pt_cmd(xpt_cmd);
677 if (rc < 0) {
678 ec_cmd->scsi_status = xpt_cmd->se_cmd.scsi_status;
679 transport_generic_free_cmd(se_cmd, 0);
680 return rc;
681 }
682 /*
683 * Clear off the allocated t_data_sg, that has been saved for
684 * zero-copy WRITE submission reuse in struct xcopy_op..
685 */
686 se_cmd->t_data_sg = NULL;
687 se_cmd->t_data_nents = 0;
688
689 return 0;
690 }
691
692 static int target_xcopy_write_destination(
693 struct se_cmd *ec_cmd,
694 struct xcopy_op *xop,
695 struct se_device *dst_dev,
696 sector_t dst_lba,
697 u32 dst_sectors)
698 {
699 struct xcopy_pt_cmd *xpt_cmd;
700 struct se_cmd *se_cmd;
701 u32 length = (dst_sectors * dst_dev->dev_attrib.block_size);
702 int rc;
703 unsigned char cdb[16];
704 bool remote_port = (xop->op_origin == XCOL_SOURCE_RECV_OP);
705
706 xpt_cmd = kzalloc(sizeof(struct xcopy_pt_cmd), GFP_KERNEL);
707 if (!xpt_cmd) {
708 pr_err("Unable to allocate xcopy_pt_cmd\n");
709 return -ENOMEM;
710 }
711 init_completion(&xpt_cmd->xpt_passthrough_sem);
712 se_cmd = &xpt_cmd->se_cmd;
713
714 memset(&cdb[0], 0, 16);
715 cdb[0] = WRITE_16;
716 put_unaligned_be64(dst_lba, &cdb[2]);
717 put_unaligned_be32(dst_sectors, &cdb[10]);
718 pr_debug("XCOPY: Built WRITE_16: LBA: %llu Sectors: %u Length: %u\n",
719 (unsigned long long)dst_lba, dst_sectors, length);
720
721 transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, &xcopy_pt_sess, length,
722 DMA_TO_DEVICE, 0, &xpt_cmd->sense_buffer[0]);
723 xop->dst_pt_cmd = xpt_cmd;
724
725 rc = target_xcopy_setup_pt_cmd(xpt_cmd, xop, dst_dev, &cdb[0],
726 remote_port, false);
727 if (rc < 0) {
728 struct se_cmd *src_cmd = &xop->src_pt_cmd->se_cmd;
729 ec_cmd->scsi_status = xpt_cmd->se_cmd.scsi_status;
730 /*
731 * If the failure happened before the t_mem_list hand-off in
732 * target_xcopy_setup_pt_cmd(), Reset memory + clear flag so that
733 * core releases this memory on error during X-COPY WRITE I/O.
734 */
735 src_cmd->se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
736 src_cmd->t_data_sg = xop->xop_data_sg;
737 src_cmd->t_data_nents = xop->xop_data_nents;
738
739 transport_generic_free_cmd(se_cmd, 0);
740 return rc;
741 }
742
743 rc = target_xcopy_issue_pt_cmd(xpt_cmd);
744 if (rc < 0) {
745 ec_cmd->scsi_status = xpt_cmd->se_cmd.scsi_status;
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 * Don't override an error scsi status if it has already been set
834 */
835 if (ec_cmd->scsi_status == SAM_STAT_GOOD) {
836 pr_warn_ratelimited("target_xcopy_do_work: rc: %d, Setting X-COPY"
837 " CHECK_CONDITION -> sending response\n", rc);
838 ec_cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
839 }
840 target_complete_cmd(ec_cmd, SAM_STAT_CHECK_CONDITION);
841 }
842
843 sense_reason_t target_do_xcopy(struct se_cmd *se_cmd)
844 {
845 struct se_device *dev = se_cmd->se_dev;
846 struct xcopy_op *xop = NULL;
847 unsigned char *p = NULL, *seg_desc;
848 unsigned int list_id, list_id_usage, sdll, inline_dl, sa;
849 sense_reason_t ret = TCM_INVALID_PARAMETER_LIST;
850 int rc;
851 unsigned short tdll;
852
853 if (!dev->dev_attrib.emulate_3pc) {
854 pr_err("EXTENDED_COPY operation explicitly disabled\n");
855 return TCM_UNSUPPORTED_SCSI_OPCODE;
856 }
857
858 sa = se_cmd->t_task_cdb[1] & 0x1f;
859 if (sa != 0x00) {
860 pr_err("EXTENDED_COPY(LID4) not supported\n");
861 return TCM_UNSUPPORTED_SCSI_OPCODE;
862 }
863
864 xop = kzalloc(sizeof(struct xcopy_op), GFP_KERNEL);
865 if (!xop) {
866 pr_err("Unable to allocate xcopy_op\n");
867 return TCM_OUT_OF_RESOURCES;
868 }
869 xop->xop_se_cmd = se_cmd;
870
871 p = transport_kmap_data_sg(se_cmd);
872 if (!p) {
873 pr_err("transport_kmap_data_sg() failed in target_do_xcopy\n");
874 kfree(xop);
875 return TCM_OUT_OF_RESOURCES;
876 }
877
878 list_id = p[0];
879 list_id_usage = (p[1] & 0x18) >> 3;
880
881 /*
882 * Determine TARGET DESCRIPTOR LIST LENGTH + SEGMENT DESCRIPTOR LIST LENGTH
883 */
884 tdll = get_unaligned_be16(&p[2]);
885 sdll = get_unaligned_be32(&p[8]);
886
887 inline_dl = get_unaligned_be32(&p[12]);
888 if (inline_dl != 0) {
889 pr_err("XCOPY with non zero inline data length\n");
890 goto out;
891 }
892
893 pr_debug("Processing XCOPY with list_id: 0x%02x list_id_usage: 0x%02x"
894 " tdll: %hu sdll: %u inline_dl: %u\n", list_id, list_id_usage,
895 tdll, sdll, inline_dl);
896
897 rc = target_xcopy_parse_target_descriptors(se_cmd, xop, &p[16], tdll, &ret);
898 if (rc <= 0)
899 goto out;
900
901 if (xop->src_dev->dev_attrib.block_size !=
902 xop->dst_dev->dev_attrib.block_size) {
903 pr_err("XCOPY: Non matching src_dev block_size: %u + dst_dev"
904 " block_size: %u currently unsupported\n",
905 xop->src_dev->dev_attrib.block_size,
906 xop->dst_dev->dev_attrib.block_size);
907 xcopy_pt_undepend_remotedev(xop);
908 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
909 goto out;
910 }
911
912 pr_debug("XCOPY: Processed %d target descriptors, length: %u\n", rc,
913 rc * XCOPY_TARGET_DESC_LEN);
914 seg_desc = &p[16];
915 seg_desc += (rc * XCOPY_TARGET_DESC_LEN);
916
917 rc = target_xcopy_parse_segment_descriptors(se_cmd, xop, seg_desc, sdll);
918 if (rc <= 0) {
919 xcopy_pt_undepend_remotedev(xop);
920 goto out;
921 }
922 transport_kunmap_data_sg(se_cmd);
923
924 pr_debug("XCOPY: Processed %d segment descriptors, length: %u\n", rc,
925 rc * XCOPY_SEGMENT_DESC_LEN);
926 INIT_WORK(&xop->xop_work, target_xcopy_do_work);
927 queue_work(xcopy_wq, &xop->xop_work);
928 return TCM_NO_SENSE;
929
930 out:
931 if (p)
932 transport_kunmap_data_sg(se_cmd);
933 kfree(xop);
934 return ret;
935 }
936
937 static sense_reason_t target_rcr_operating_parameters(struct se_cmd *se_cmd)
938 {
939 unsigned char *p;
940
941 p = transport_kmap_data_sg(se_cmd);
942 if (!p) {
943 pr_err("transport_kmap_data_sg failed in"
944 " target_rcr_operating_parameters\n");
945 return TCM_OUT_OF_RESOURCES;
946 }
947
948 if (se_cmd->data_length < 54) {
949 pr_err("Receive Copy Results Op Parameters length"
950 " too small: %u\n", se_cmd->data_length);
951 transport_kunmap_data_sg(se_cmd);
952 return TCM_INVALID_CDB_FIELD;
953 }
954 /*
955 * Set SNLID=1 (Supports no List ID)
956 */
957 p[4] = 0x1;
958 /*
959 * MAXIMUM TARGET DESCRIPTOR COUNT
960 */
961 put_unaligned_be16(RCR_OP_MAX_TARGET_DESC_COUNT, &p[8]);
962 /*
963 * MAXIMUM SEGMENT DESCRIPTOR COUNT
964 */
965 put_unaligned_be16(RCR_OP_MAX_SG_DESC_COUNT, &p[10]);
966 /*
967 * MAXIMUM DESCRIPTOR LIST LENGTH
968 */
969 put_unaligned_be32(RCR_OP_MAX_DESC_LIST_LEN, &p[12]);
970 /*
971 * MAXIMUM SEGMENT LENGTH
972 */
973 put_unaligned_be32(RCR_OP_MAX_SEGMENT_LEN, &p[16]);
974 /*
975 * MAXIMUM INLINE DATA LENGTH for SA 0x04 (NOT SUPPORTED)
976 */
977 put_unaligned_be32(0x0, &p[20]);
978 /*
979 * HELD DATA LIMIT
980 */
981 put_unaligned_be32(0x0, &p[24]);
982 /*
983 * MAXIMUM STREAM DEVICE TRANSFER SIZE
984 */
985 put_unaligned_be32(0x0, &p[28]);
986 /*
987 * TOTAL CONCURRENT COPIES
988 */
989 put_unaligned_be16(RCR_OP_TOTAL_CONCURR_COPIES, &p[34]);
990 /*
991 * MAXIMUM CONCURRENT COPIES
992 */
993 p[36] = RCR_OP_MAX_CONCURR_COPIES;
994 /*
995 * DATA SEGMENT GRANULARITY (log 2)
996 */
997 p[37] = RCR_OP_DATA_SEG_GRAN_LOG2;
998 /*
999 * INLINE DATA GRANULARITY log 2)
1000 */
1001 p[38] = RCR_OP_INLINE_DATA_GRAN_LOG2;
1002 /*
1003 * HELD DATA GRANULARITY
1004 */
1005 p[39] = RCR_OP_HELD_DATA_GRAN_LOG2;
1006 /*
1007 * IMPLEMENTED DESCRIPTOR LIST LENGTH
1008 */
1009 p[43] = 0x2;
1010 /*
1011 * List of implemented descriptor type codes (ordered)
1012 */
1013 p[44] = 0x02; /* Copy Block to Block device */
1014 p[45] = 0xe4; /* Identification descriptor target descriptor */
1015
1016 /*
1017 * AVAILABLE DATA (n-3)
1018 */
1019 put_unaligned_be32(42, &p[0]);
1020
1021 transport_kunmap_data_sg(se_cmd);
1022 target_complete_cmd(se_cmd, GOOD);
1023
1024 return TCM_NO_SENSE;
1025 }
1026
1027 sense_reason_t target_do_receive_copy_results(struct se_cmd *se_cmd)
1028 {
1029 unsigned char *cdb = &se_cmd->t_task_cdb[0];
1030 int sa = (cdb[1] & 0x1f), list_id = cdb[2];
1031 sense_reason_t rc = TCM_NO_SENSE;
1032
1033 pr_debug("Entering target_do_receive_copy_results: SA: 0x%02x, List ID:"
1034 " 0x%02x, AL: %u\n", sa, list_id, se_cmd->data_length);
1035
1036 if (list_id != 0) {
1037 pr_err("Receive Copy Results with non zero list identifier"
1038 " not supported\n");
1039 return TCM_INVALID_CDB_FIELD;
1040 }
1041
1042 switch (sa) {
1043 case RCR_SA_OPERATING_PARAMETERS:
1044 rc = target_rcr_operating_parameters(se_cmd);
1045 break;
1046 case RCR_SA_COPY_STATUS:
1047 case RCR_SA_RECEIVE_DATA:
1048 case RCR_SA_FAILED_SEGMENT_DETAILS:
1049 default:
1050 pr_err("Unsupported SA for receive copy results: 0x%02x\n", sa);
1051 return TCM_INVALID_CDB_FIELD;
1052 }
1053
1054 return rc;
1055 }
Linux with added FPC-III support