?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
xfs: XFS_IS_REALTIME_INODE() should be false if no rt device present
[linux/fpc-iii.git] / drivers / target / target_core_xcopy.c
blob6415e9b09a5294fd566c4c0d53b6d4c9ad442dd4
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
35 #include "target_core_internal.h"
36 #include "target_core_pr.h"
37 #include "target_core_ua.h"
38 #include "target_core_xcopy.h"
39
40 static struct workqueue_struct *xcopy_wq = NULL;
41
42 static int target_xcopy_gen_naa_ieee(struct se_device *dev, unsigned char *buf)
43 {
44 int off = 0;
45
46 buf[off++] = (0x6 << 4);
47 buf[off++] = 0x01;
48 buf[off++] = 0x40;
49 buf[off] = (0x5 << 4);
50
51 spc_parse_naa_6h_vendor_specific(dev, &buf[off]);
52 return 0;
53 }
54
55 static int target_xcopy_locate_se_dev_e4(struct se_cmd *se_cmd, struct xcopy_op *xop,
56 bool src)
57 {
58 struct se_device *se_dev;
59 unsigned char tmp_dev_wwn[XCOPY_NAA_IEEE_REGEX_LEN], *dev_wwn;
60 int rc;
61
62 if (src)
63 dev_wwn = &xop->dst_tid_wwn[0];
64 else
65 dev_wwn = &xop->src_tid_wwn[0];
66
67 mutex_lock(&g_device_mutex);
68 list_for_each_entry(se_dev, &g_device_list, g_dev_node) {
69
70 if (!se_dev->dev_attrib.emulate_3pc)
71 continue;
72
73 memset(&tmp_dev_wwn[0], 0, XCOPY_NAA_IEEE_REGEX_LEN);
74 target_xcopy_gen_naa_ieee(se_dev, &tmp_dev_wwn[0]);
75
76 rc = memcmp(&tmp_dev_wwn[0], dev_wwn, XCOPY_NAA_IEEE_REGEX_LEN);
77 if (rc != 0)
78 continue;
79
80 if (src) {
81 xop->dst_dev = se_dev;
82 pr_debug("XCOPY 0xe4: Setting xop->dst_dev: %p from located"
83 " se_dev\n", xop->dst_dev);
84 } else {
85 xop->src_dev = se_dev;
86 pr_debug("XCOPY 0xe4: Setting xop->src_dev: %p from located"
87 " se_dev\n", xop->src_dev);
88 }
89
90 rc = target_depend_item(&se_dev->dev_group.cg_item);
91 if (rc != 0) {
92 pr_err("configfs_depend_item attempt failed:"
93 " %d for se_dev: %p\n", rc, se_dev);
94 mutex_unlock(&g_device_mutex);
95 return rc;
96 }
97
98 pr_debug("Called configfs_depend_item for se_dev: %p"
99 " se_dev->se_dev_group: %p\n", se_dev,
100 &se_dev->dev_group);
101
102 mutex_unlock(&g_device_mutex);
103 return 0;
104 }
105 mutex_unlock(&g_device_mutex);
106
107 pr_debug_ratelimited("Unable to locate 0xe4 descriptor for EXTENDED_COPY\n");
108 return -EINVAL;
109 }
110
111 static int target_xcopy_parse_tiddesc_e4(struct se_cmd *se_cmd, struct xcopy_op *xop,
112 unsigned char *p, bool src)
113 {
114 unsigned char *desc = p;
115 unsigned short ript;
116 u8 desig_len;
117 /*
118 * Extract RELATIVE INITIATOR PORT IDENTIFIER
119 */
120 ript = get_unaligned_be16(&desc[2]);
121 pr_debug("XCOPY 0xe4: RELATIVE INITIATOR PORT IDENTIFIER: %hu\n", ript);
122 /*
123 * Check for supported code set, association, and designator type
124 */
125 if ((desc[4] & 0x0f) != 0x1) {
126 pr_err("XCOPY 0xe4: code set of non binary type not supported\n");
127 return -EINVAL;
128 }
129 if ((desc[5] & 0x30) != 0x00) {
130 pr_err("XCOPY 0xe4: association other than LUN not supported\n");
131 return -EINVAL;
132 }
133 if ((desc[5] & 0x0f) != 0x3) {
134 pr_err("XCOPY 0xe4: designator type unsupported: 0x%02x\n",
135 (desc[5] & 0x0f));
136 return -EINVAL;
137 }
138 /*
139 * Check for matching 16 byte length for NAA IEEE Registered Extended
140 * Assigned designator
141 */
142 desig_len = desc[7];
143 if (desig_len != 16) {
144 pr_err("XCOPY 0xe4: invalid desig_len: %d\n", (int)desig_len);
145 return -EINVAL;
146 }
147 pr_debug("XCOPY 0xe4: desig_len: %d\n", (int)desig_len);
148 /*
149 * Check for NAA IEEE Registered Extended Assigned header..
150 */
151 if ((desc[8] & 0xf0) != 0x60) {
152 pr_err("XCOPY 0xe4: Unsupported DESIGNATOR TYPE: 0x%02x\n",
153 (desc[8] & 0xf0));
154 return -EINVAL;
155 }
156
157 if (src) {
158 memcpy(&xop->src_tid_wwn[0], &desc[8], XCOPY_NAA_IEEE_REGEX_LEN);
159 /*
160 * Determine if the source designator matches the local device
161 */
162 if (!memcmp(&xop->local_dev_wwn[0], &xop->src_tid_wwn[0],
163 XCOPY_NAA_IEEE_REGEX_LEN)) {
164 xop->op_origin = XCOL_SOURCE_RECV_OP;
165 xop->src_dev = se_cmd->se_dev;
166 pr_debug("XCOPY 0xe4: Set xop->src_dev %p from source"
167 " received xop\n", xop->src_dev);
168 }
169 } else {
170 memcpy(&xop->dst_tid_wwn[0], &desc[8], XCOPY_NAA_IEEE_REGEX_LEN);
171 /*
172 * Determine if the destination designator matches the local device
173 */
174 if (!memcmp(&xop->local_dev_wwn[0], &xop->dst_tid_wwn[0],
175 XCOPY_NAA_IEEE_REGEX_LEN)) {
176 xop->op_origin = XCOL_DEST_RECV_OP;
177 xop->dst_dev = se_cmd->se_dev;
178 pr_debug("XCOPY 0xe4: Set xop->dst_dev: %p from destination"
179 " received xop\n", xop->dst_dev);
180 }
181 }
182
183 return 0;
184 }
185
186 static int target_xcopy_parse_target_descriptors(struct se_cmd *se_cmd,
187 struct xcopy_op *xop, unsigned char *p,
188 unsigned short tdll, sense_reason_t *sense_ret)
189 {
190 struct se_device *local_dev = se_cmd->se_dev;
191 unsigned char *desc = p;
192 int offset = tdll % XCOPY_TARGET_DESC_LEN, rc, ret = 0;
193 unsigned short start = 0;
194 bool src = true;
195
196 *sense_ret = TCM_INVALID_PARAMETER_LIST;
197
198 if (offset != 0) {
199 pr_err("XCOPY target descriptor list length is not"
200 " multiple of %d\n", XCOPY_TARGET_DESC_LEN);
201 return -EINVAL;
202 }
203 if (tdll > 64) {
204 pr_err("XCOPY target descriptor supports a maximum"
205 " two src/dest descriptors, tdll: %hu too large..\n", tdll);
206 return -EINVAL;
207 }
208 /*
209 * Generate an IEEE Registered Extended designator based upon the
210 * se_device the XCOPY was received upon..
211 */
212 memset(&xop->local_dev_wwn[0], 0, XCOPY_NAA_IEEE_REGEX_LEN);
213 target_xcopy_gen_naa_ieee(local_dev, &xop->local_dev_wwn[0]);
214
215 while (start < tdll) {
216 /*
217 * Check target descriptor identification with 0xE4 type with
218 * use VPD 0x83 WWPN matching ..
219 */
220 switch (desc[0]) {
221 case 0xe4:
222 rc = target_xcopy_parse_tiddesc_e4(se_cmd, xop,
223 &desc[0], src);
224 if (rc != 0)
225 goto out;
226 /*
227 * Assume target descriptors are in source -> destination order..
228 */
229 if (src)
230 src = false;
231 else
232 src = true;
233 start += XCOPY_TARGET_DESC_LEN;
234 desc += XCOPY_TARGET_DESC_LEN;
235 ret++;
236 break;
237 default:
238 pr_err("XCOPY unsupported descriptor type code:"
239 " 0x%02x\n", desc[0]);
240 goto out;
241 }
242 }
243
244 if (xop->op_origin == XCOL_SOURCE_RECV_OP)
245 rc = target_xcopy_locate_se_dev_e4(se_cmd, xop, true);
246 else
247 rc = target_xcopy_locate_se_dev_e4(se_cmd, xop, false);
248 /*
249 * If a matching IEEE NAA 0x83 descriptor for the requested device
250 * is not located on this node, return COPY_ABORTED with ASQ/ASQC
251 * 0x0d/0x02 - COPY_TARGET_DEVICE_NOT_REACHABLE to request the
252 * initiator to fall back to normal copy method.
253 */
254 if (rc < 0) {
255 *sense_ret = TCM_COPY_TARGET_DEVICE_NOT_REACHABLE;
256 goto out;
257 }
258
259 pr_debug("XCOPY TGT desc: Source dev: %p NAA IEEE WWN: 0x%16phN\n",
260 xop->src_dev, &xop->src_tid_wwn[0]);
261 pr_debug("XCOPY TGT desc: Dest dev: %p NAA IEEE WWN: 0x%16phN\n",
262 xop->dst_dev, &xop->dst_tid_wwn[0]);
263
264 return ret;
265
266 out:
267 return -EINVAL;
268 }
269
270 static int target_xcopy_parse_segdesc_02(struct se_cmd *se_cmd, struct xcopy_op *xop,
271 unsigned char *p)
272 {
273 unsigned char *desc = p;
274 int dc = (desc[1] & 0x02);
275 unsigned short desc_len;
276
277 desc_len = get_unaligned_be16(&desc[2]);
278 if (desc_len != 0x18) {
279 pr_err("XCOPY segment desc 0x02: Illegal desc_len:"
280 " %hu\n", desc_len);
281 return -EINVAL;
282 }
283
284 xop->stdi = get_unaligned_be16(&desc[4]);
285 xop->dtdi = get_unaligned_be16(&desc[6]);
286 pr_debug("XCOPY seg desc 0x02: desc_len: %hu stdi: %hu dtdi: %hu, DC: %d\n",
287 desc_len, xop->stdi, xop->dtdi, dc);
288
289 xop->nolb = get_unaligned_be16(&desc[10]);
290 xop->src_lba = get_unaligned_be64(&desc[12]);
291 xop->dst_lba = get_unaligned_be64(&desc[20]);
292 pr_debug("XCOPY seg desc 0x02: nolb: %hu src_lba: %llu dst_lba: %llu\n",
293 xop->nolb, (unsigned long long)xop->src_lba,
294 (unsigned long long)xop->dst_lba);
295
296 if (dc != 0) {
297 xop->dbl = (desc[29] & 0xff) << 16;
298 xop->dbl |= (desc[30] & 0xff) << 8;
299 xop->dbl |= desc[31] & 0xff;
300
301 pr_debug("XCOPY seg desc 0x02: DC=1 w/ dbl: %u\n", xop->dbl);
302 }
303 return 0;
304 }
305
306 static int target_xcopy_parse_segment_descriptors(struct se_cmd *se_cmd,
307 struct xcopy_op *xop, unsigned char *p,
308 unsigned int sdll)
309 {
310 unsigned char *desc = p;
311 unsigned int start = 0;
312 int offset = sdll % XCOPY_SEGMENT_DESC_LEN, rc, ret = 0;
313
314 if (offset != 0) {
315 pr_err("XCOPY segment descriptor list length is not"
316 " multiple of %d\n", XCOPY_SEGMENT_DESC_LEN);
317 return -EINVAL;
318 }
319
320 while (start < sdll) {
321 /*
322 * Check segment descriptor type code for block -> block
323 */
324 switch (desc[0]) {
325 case 0x02:
326 rc = target_xcopy_parse_segdesc_02(se_cmd, xop, desc);
327 if (rc < 0)
328 goto out;
329
330 ret++;
331 start += XCOPY_SEGMENT_DESC_LEN;
332 desc += XCOPY_SEGMENT_DESC_LEN;
333 break;
334 default:
335 pr_err("XCOPY unsupported segment descriptor"
336 "type: 0x%02x\n", desc[0]);
337 goto out;
338 }
339 }
340
341 return ret;
342
343 out:
344 return -EINVAL;
345 }
346
347 /*
348 * Start xcopy_pt ops
349 */
350
351 struct xcopy_pt_cmd {
352 bool remote_port;
353 struct se_cmd se_cmd;
354 struct xcopy_op *xcopy_op;
355 struct completion xpt_passthrough_sem;
356 unsigned char sense_buffer[TRANSPORT_SENSE_BUFFER];
357 };
358
359 struct se_portal_group xcopy_pt_tpg;
360 static struct se_session xcopy_pt_sess;
361 static struct se_node_acl xcopy_pt_nacl;
362
363 static char *xcopy_pt_get_fabric_name(void)
364 {
365 return "xcopy-pt";
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 se_device *remote_dev;
376
377 if (xop->op_origin == XCOL_SOURCE_RECV_OP)
378 remote_dev = xop->dst_dev;
379 else
380 remote_dev = xop->src_dev;
381
382 pr_debug("Calling configfs_undepend_item for"
383 " remote_dev: %p remote_dev->dev_group: %p\n",
384 remote_dev, &remote_dev->dev_group.cg_item);
385
386 target_undepend_item(&remote_dev->dev_group.cg_item);
387 }
388
389 static void xcopy_pt_release_cmd(struct se_cmd *se_cmd)
390 {
391 struct xcopy_pt_cmd *xpt_cmd = container_of(se_cmd,
392 struct xcopy_pt_cmd, se_cmd);
393
394 kfree(xpt_cmd);
395 }
396
397 static int xcopy_pt_check_stop_free(struct se_cmd *se_cmd)
398 {
399 struct xcopy_pt_cmd *xpt_cmd = container_of(se_cmd,
400 struct xcopy_pt_cmd, se_cmd);
401
402 complete(&xpt_cmd->xpt_passthrough_sem);
403 return 0;
404 }
405
406 static int xcopy_pt_write_pending(struct se_cmd *se_cmd)
407 {
408 return 0;
409 }
410
411 static int xcopy_pt_write_pending_status(struct se_cmd *se_cmd)
412 {
413 return 0;
414 }
415
416 static int xcopy_pt_queue_data_in(struct se_cmd *se_cmd)
417 {
418 return 0;
419 }
420
421 static int xcopy_pt_queue_status(struct se_cmd *se_cmd)
422 {
423 return 0;
424 }
425
426 static const struct target_core_fabric_ops xcopy_pt_tfo = {
427 .get_fabric_name = xcopy_pt_get_fabric_name,
428 .get_cmd_state = xcopy_pt_get_cmd_state,
429 .release_cmd = xcopy_pt_release_cmd,
430 .check_stop_free = xcopy_pt_check_stop_free,
431 .write_pending = xcopy_pt_write_pending,
432 .write_pending_status = xcopy_pt_write_pending_status,
433 .queue_data_in = xcopy_pt_queue_data_in,
434 .queue_status = xcopy_pt_queue_status,
435 };
436
437 /*
438 * End xcopy_pt_ops
439 */
440
441 int target_xcopy_setup_pt(void)
442 {
443 xcopy_wq = alloc_workqueue("xcopy_wq", WQ_MEM_RECLAIM, 0);
444 if (!xcopy_wq) {
445 pr_err("Unable to allocate xcopy_wq\n");
446 return -ENOMEM;
447 }
448
449 memset(&xcopy_pt_tpg, 0, sizeof(struct se_portal_group));
450 INIT_LIST_HEAD(&xcopy_pt_tpg.se_tpg_node);
451 INIT_LIST_HEAD(&xcopy_pt_tpg.acl_node_list);
452 INIT_LIST_HEAD(&xcopy_pt_tpg.tpg_sess_list);
453
454 xcopy_pt_tpg.se_tpg_tfo = &xcopy_pt_tfo;
455
456 memset(&xcopy_pt_nacl, 0, sizeof(struct se_node_acl));
457 INIT_LIST_HEAD(&xcopy_pt_nacl.acl_list);
458 INIT_LIST_HEAD(&xcopy_pt_nacl.acl_sess_list);
459 memset(&xcopy_pt_sess, 0, sizeof(struct se_session));
460 INIT_LIST_HEAD(&xcopy_pt_sess.sess_list);
461 INIT_LIST_HEAD(&xcopy_pt_sess.sess_acl_list);
462 INIT_LIST_HEAD(&xcopy_pt_sess.sess_cmd_list);
463 spin_lock_init(&xcopy_pt_sess.sess_cmd_lock);
464
465 xcopy_pt_nacl.se_tpg = &xcopy_pt_tpg;
466 xcopy_pt_nacl.nacl_sess = &xcopy_pt_sess;
467
468 xcopy_pt_sess.se_tpg = &xcopy_pt_tpg;
469 xcopy_pt_sess.se_node_acl = &xcopy_pt_nacl;
470
471 return 0;
472 }
473
474 void target_xcopy_release_pt(void)
475 {
476 if (xcopy_wq)
477 destroy_workqueue(xcopy_wq);
478 }
479
480 static void target_xcopy_setup_pt_port(
481 struct xcopy_pt_cmd *xpt_cmd,
482 struct xcopy_op *xop,
483 bool remote_port)
484 {
485 struct se_cmd *ec_cmd = xop->xop_se_cmd;
486 struct se_cmd *pt_cmd = &xpt_cmd->se_cmd;
487
488 if (xop->op_origin == XCOL_SOURCE_RECV_OP) {
489 /*
490 * Honor destination port reservations for X-COPY PUSH emulation
491 * when CDB is received on local source port, and READs blocks to
492 * WRITE on remote destination port.
493 */
494 if (remote_port) {
495 xpt_cmd->remote_port = remote_port;
496 } else {
497 pt_cmd->se_lun = ec_cmd->se_lun;
498 pt_cmd->se_dev = ec_cmd->se_dev;
499
500 pr_debug("Honoring local SRC port from ec_cmd->se_dev:"
501 " %p\n", pt_cmd->se_dev);
502 pt_cmd->se_lun = ec_cmd->se_lun;
503 pr_debug("Honoring local SRC port from ec_cmd->se_lun: %p\n",
504 pt_cmd->se_lun);
505 }
506 } else {
507 /*
508 * Honor source port reservation for X-COPY PULL emulation
509 * when CDB is received on local desintation port, and READs
510 * blocks from the remote source port to WRITE on local
511 * destination port.
512 */
513 if (remote_port) {
514 xpt_cmd->remote_port = remote_port;
515 } else {
516 pt_cmd->se_lun = ec_cmd->se_lun;
517 pt_cmd->se_dev = ec_cmd->se_dev;
518
519 pr_debug("Honoring local DST port from ec_cmd->se_dev:"
520 " %p\n", pt_cmd->se_dev);
521 pt_cmd->se_lun = ec_cmd->se_lun;
522 pr_debug("Honoring local DST port from ec_cmd->se_lun: %p\n",
523 pt_cmd->se_lun);
524 }
525 }
526 }
527
528 static void target_xcopy_init_pt_lun(struct se_device *se_dev,
529 struct se_cmd *pt_cmd, bool remote_port)
530 {
531 /*
532 * Don't allocate + init an pt_cmd->se_lun if honoring local port for
533 * reservations. The pt_cmd->se_lun pointer will be setup from within
534 * target_xcopy_setup_pt_port()
535 */
536 if (remote_port) {
537 pr_debug("Setup emulated se_dev: %p from se_dev\n",
538 pt_cmd->se_dev);
539 pt_cmd->se_lun = &se_dev->xcopy_lun;
540 pt_cmd->se_dev = se_dev;
541 }
542
543 pt_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
544 }
545
546 static int target_xcopy_setup_pt_cmd(
547 struct xcopy_pt_cmd *xpt_cmd,
548 struct xcopy_op *xop,
549 struct se_device *se_dev,
550 unsigned char *cdb,
551 bool remote_port,
552 bool alloc_mem)
553 {
554 struct se_cmd *cmd = &xpt_cmd->se_cmd;
555 sense_reason_t sense_rc;
556 int ret = 0, rc;
557 /*
558 * Setup LUN+port to honor reservations based upon xop->op_origin for
559 * X-COPY PUSH or X-COPY PULL based upon where the CDB was received.
560 */
561 target_xcopy_init_pt_lun(se_dev, cmd, remote_port);
562
563 xpt_cmd->xcopy_op = xop;
564 target_xcopy_setup_pt_port(xpt_cmd, xop, remote_port);
565
566 cmd->tag = 0;
567 sense_rc = target_setup_cmd_from_cdb(cmd, cdb);
568 if (sense_rc) {
569 ret = -EINVAL;
570 goto out;
571 }
572
573 if (alloc_mem) {
574 rc = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents,
575 cmd->data_length, false);
576 if (rc < 0) {
577 ret = rc;
578 goto out;
579 }
580 /*
581 * Set this bit so that transport_free_pages() allows the
582 * caller to release SGLs + physical memory allocated by
583 * transport_generic_get_mem()..
584 */
585 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
586 } else {
587 /*
588 * Here the previously allocated SGLs for the internal READ
589 * are mapped zero-copy to the internal WRITE.
590 */
591 sense_rc = transport_generic_map_mem_to_cmd(cmd,
592 xop->xop_data_sg, xop->xop_data_nents,
593 NULL, 0);
594 if (sense_rc) {
595 ret = -EINVAL;
596 goto out;
597 }
598
599 pr_debug("Setup PASSTHROUGH_NOALLOC t_data_sg: %p t_data_nents:"
600 " %u\n", cmd->t_data_sg, cmd->t_data_nents);
601 }
602
603 return 0;
604
605 out:
606 return ret;
607 }
608
609 static int target_xcopy_issue_pt_cmd(struct xcopy_pt_cmd *xpt_cmd)
610 {
611 struct se_cmd *se_cmd = &xpt_cmd->se_cmd;
612 sense_reason_t sense_rc;
613
614 sense_rc = transport_generic_new_cmd(se_cmd);
615 if (sense_rc)
616 return -EINVAL;
617
618 if (se_cmd->data_direction == DMA_TO_DEVICE)
619 target_execute_cmd(se_cmd);
620
621 wait_for_completion_interruptible(&xpt_cmd->xpt_passthrough_sem);
622
623 pr_debug("target_xcopy_issue_pt_cmd(): SCSI status: 0x%02x\n",
624 se_cmd->scsi_status);
625
626 return (se_cmd->scsi_status) ? -EINVAL : 0;
627 }
628
629 static int target_xcopy_read_source(
630 struct se_cmd *ec_cmd,
631 struct xcopy_op *xop,
632 struct se_device *src_dev,
633 sector_t src_lba,
634 u32 src_sectors)
635 {
636 struct xcopy_pt_cmd *xpt_cmd;
637 struct se_cmd *se_cmd;
638 u32 length = (src_sectors * src_dev->dev_attrib.block_size);
639 int rc;
640 unsigned char cdb[16];
641 bool remote_port = (xop->op_origin == XCOL_DEST_RECV_OP);
642
643 xpt_cmd = kzalloc(sizeof(struct xcopy_pt_cmd), GFP_KERNEL);
644 if (!xpt_cmd) {
645 pr_err("Unable to allocate xcopy_pt_cmd\n");
646 return -ENOMEM;
647 }
648 init_completion(&xpt_cmd->xpt_passthrough_sem);
649 se_cmd = &xpt_cmd->se_cmd;
650
651 memset(&cdb[0], 0, 16);
652 cdb[0] = READ_16;
653 put_unaligned_be64(src_lba, &cdb[2]);
654 put_unaligned_be32(src_sectors, &cdb[10]);
655 pr_debug("XCOPY: Built READ_16: LBA: %llu Sectors: %u Length: %u\n",
656 (unsigned long long)src_lba, src_sectors, length);
657
658 transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, &xcopy_pt_sess, length,
659 DMA_FROM_DEVICE, 0, &xpt_cmd->sense_buffer[0]);
660 xop->src_pt_cmd = xpt_cmd;
661
662 rc = target_xcopy_setup_pt_cmd(xpt_cmd, xop, src_dev, &cdb[0],
663 remote_port, true);
664 if (rc < 0) {
665 ec_cmd->scsi_status = xpt_cmd->se_cmd.scsi_status;
666 transport_generic_free_cmd(se_cmd, 0);
667 return rc;
668 }
669
670 xop->xop_data_sg = se_cmd->t_data_sg;
671 xop->xop_data_nents = se_cmd->t_data_nents;
672 pr_debug("XCOPY-READ: Saved xop->xop_data_sg: %p, num: %u for READ"
673 " memory\n", xop->xop_data_sg, xop->xop_data_nents);
674
675 rc = target_xcopy_issue_pt_cmd(xpt_cmd);
676 if (rc < 0) {
677 ec_cmd->scsi_status = xpt_cmd->se_cmd.scsi_status;
678 transport_generic_free_cmd(se_cmd, 0);
679 return rc;
680 }
681 /*
682 * Clear off the allocated t_data_sg, that has been saved for
683 * zero-copy WRITE submission reuse in struct xcopy_op..
684 */
685 se_cmd->t_data_sg = NULL;
686 se_cmd->t_data_nents = 0;
687
688 return 0;
689 }
690
691 static int target_xcopy_write_destination(
692 struct se_cmd *ec_cmd,
693 struct xcopy_op *xop,
694 struct se_device *dst_dev,
695 sector_t dst_lba,
696 u32 dst_sectors)
697 {
698 struct xcopy_pt_cmd *xpt_cmd;
699 struct se_cmd *se_cmd;
700 u32 length = (dst_sectors * dst_dev->dev_attrib.block_size);
701 int rc;
702 unsigned char cdb[16];
703 bool remote_port = (xop->op_origin == XCOL_SOURCE_RECV_OP);
704
705 xpt_cmd = kzalloc(sizeof(struct xcopy_pt_cmd), GFP_KERNEL);
706 if (!xpt_cmd) {
707 pr_err("Unable to allocate xcopy_pt_cmd\n");
708 return -ENOMEM;
709 }
710 init_completion(&xpt_cmd->xpt_passthrough_sem);
711 se_cmd = &xpt_cmd->se_cmd;
712
713 memset(&cdb[0], 0, 16);
714 cdb[0] = WRITE_16;
715 put_unaligned_be64(dst_lba, &cdb[2]);
716 put_unaligned_be32(dst_sectors, &cdb[10]);
717 pr_debug("XCOPY: Built WRITE_16: LBA: %llu Sectors: %u Length: %u\n",
718 (unsigned long long)dst_lba, dst_sectors, length);
719
720 transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, &xcopy_pt_sess, length,
721 DMA_TO_DEVICE, 0, &xpt_cmd->sense_buffer[0]);
722 xop->dst_pt_cmd = xpt_cmd;
723
724 rc = target_xcopy_setup_pt_cmd(xpt_cmd, xop, dst_dev, &cdb[0],
725 remote_port, false);
726 if (rc < 0) {
727 struct se_cmd *src_cmd = &xop->src_pt_cmd->se_cmd;
728 ec_cmd->scsi_status = xpt_cmd->se_cmd.scsi_status;
729 /*
730 * If the failure happened before the t_mem_list hand-off in
731 * target_xcopy_setup_pt_cmd(), Reset memory + clear flag so that
732 * core releases this memory on error during X-COPY WRITE I/O.
733 */
734 src_cmd->se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
735 src_cmd->t_data_sg = xop->xop_data_sg;
736 src_cmd->t_data_nents = xop->xop_data_nents;
737
738 transport_generic_free_cmd(se_cmd, 0);
739 return rc;
740 }
741
742 rc = target_xcopy_issue_pt_cmd(xpt_cmd);
743 if (rc < 0) {
744 ec_cmd->scsi_status = xpt_cmd->se_cmd.scsi_status;
745 se_cmd->se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
746 transport_generic_free_cmd(se_cmd, 0);
747 return rc;
748 }
749
750 return 0;
751 }
752
753 static void target_xcopy_do_work(struct work_struct *work)
754 {
755 struct xcopy_op *xop = container_of(work, struct xcopy_op, xop_work);
756 struct se_device *src_dev = xop->src_dev, *dst_dev = xop->dst_dev;
757 struct se_cmd *ec_cmd = xop->xop_se_cmd;
758 sector_t src_lba = xop->src_lba, dst_lba = xop->dst_lba, end_lba;
759 unsigned int max_sectors;
760 int rc;
761 unsigned short nolb = xop->nolb, cur_nolb, max_nolb, copied_nolb = 0;
762
763 end_lba = src_lba + nolb;
764 /*
765 * Break up XCOPY I/O into hw_max_sectors sized I/O based on the
766 * smallest max_sectors between src_dev + dev_dev, or
767 */
768 max_sectors = min(src_dev->dev_attrib.hw_max_sectors,
769 dst_dev->dev_attrib.hw_max_sectors);
770 max_sectors = min_t(u32, max_sectors, XCOPY_MAX_SECTORS);
771
772 max_nolb = min_t(u16, max_sectors, ((u16)(~0U)));
773
774 pr_debug("target_xcopy_do_work: nolb: %hu, max_nolb: %hu end_lba: %llu\n",
775 nolb, max_nolb, (unsigned long long)end_lba);
776 pr_debug("target_xcopy_do_work: Starting src_lba: %llu, dst_lba: %llu\n",
777 (unsigned long long)src_lba, (unsigned long long)dst_lba);
778
779 while (src_lba < end_lba) {
780 cur_nolb = min(nolb, max_nolb);
781
782 pr_debug("target_xcopy_do_work: Calling read src_dev: %p src_lba: %llu,"
783 " cur_nolb: %hu\n", src_dev, (unsigned long long)src_lba, cur_nolb);
784
785 rc = target_xcopy_read_source(ec_cmd, xop, src_dev, src_lba, cur_nolb);
786 if (rc < 0)
787 goto out;
788
789 src_lba += cur_nolb;
790 pr_debug("target_xcopy_do_work: Incremented READ src_lba to %llu\n",
791 (unsigned long long)src_lba);
792
793 pr_debug("target_xcopy_do_work: Calling write dst_dev: %p dst_lba: %llu,"
794 " cur_nolb: %hu\n", dst_dev, (unsigned long long)dst_lba, cur_nolb);
795
796 rc = target_xcopy_write_destination(ec_cmd, xop, dst_dev,
797 dst_lba, cur_nolb);
798 if (rc < 0) {
799 transport_generic_free_cmd(&xop->src_pt_cmd->se_cmd, 0);
800 goto out;
801 }
802
803 dst_lba += cur_nolb;
804 pr_debug("target_xcopy_do_work: Incremented WRITE dst_lba to %llu\n",
805 (unsigned long long)dst_lba);
806
807 copied_nolb += cur_nolb;
808 nolb -= cur_nolb;
809
810 transport_generic_free_cmd(&xop->src_pt_cmd->se_cmd, 0);
811 xop->dst_pt_cmd->se_cmd.se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
812
813 transport_generic_free_cmd(&xop->dst_pt_cmd->se_cmd, 0);
814 }
815
816 xcopy_pt_undepend_remotedev(xop);
817 kfree(xop);
818
819 pr_debug("target_xcopy_do_work: Final src_lba: %llu, dst_lba: %llu\n",
820 (unsigned long long)src_lba, (unsigned long long)dst_lba);
821 pr_debug("target_xcopy_do_work: Blocks copied: %hu, Bytes Copied: %u\n",
822 copied_nolb, copied_nolb * dst_dev->dev_attrib.block_size);
823
824 pr_debug("target_xcopy_do_work: Setting X-COPY GOOD status -> sending response\n");
825 target_complete_cmd(ec_cmd, SAM_STAT_GOOD);
826 return;
827
828 out:
829 xcopy_pt_undepend_remotedev(xop);
830 kfree(xop);
831 /*
832 * Don't override an error scsi status if it has already been set
833 */
834 if (ec_cmd->scsi_status == SAM_STAT_GOOD) {
835 pr_warn_ratelimited("target_xcopy_do_work: rc: %d, Setting X-COPY"
836 " CHECK_CONDITION -> sending response\n", rc);
837 ec_cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
838 }
839 target_complete_cmd(ec_cmd, ec_cmd->scsi_status);
840 }
841
842 sense_reason_t target_do_xcopy(struct se_cmd *se_cmd)
843 {
844 struct se_device *dev = se_cmd->se_dev;
845 struct xcopy_op *xop = NULL;
846 unsigned char *p = NULL, *seg_desc;
847 unsigned int list_id, list_id_usage, sdll, inline_dl, sa;
848 sense_reason_t ret = TCM_INVALID_PARAMETER_LIST;
849 int rc;
850 unsigned short tdll;
851
852 if (!dev->dev_attrib.emulate_3pc) {
853 pr_err("EXTENDED_COPY operation explicitly disabled\n");
854 return TCM_UNSUPPORTED_SCSI_OPCODE;
855 }
856
857 sa = se_cmd->t_task_cdb[1] & 0x1f;
858 if (sa != 0x00) {
859 pr_err("EXTENDED_COPY(LID4) not supported\n");
860 return TCM_UNSUPPORTED_SCSI_OPCODE;
861 }
862
863 xop = kzalloc(sizeof(struct xcopy_op), GFP_KERNEL);
864 if (!xop) {
865 pr_err("Unable to allocate xcopy_op\n");
866 return TCM_OUT_OF_RESOURCES;
867 }
868 xop->xop_se_cmd = se_cmd;
869
870 p = transport_kmap_data_sg(se_cmd);
871 if (!p) {
872 pr_err("transport_kmap_data_sg() failed in target_do_xcopy\n");
873 kfree(xop);
874 return TCM_OUT_OF_RESOURCES;
875 }
876
877 list_id = p[0];
878 list_id_usage = (p[1] & 0x18) >> 3;
879
880 /*
881 * Determine TARGET DESCRIPTOR LIST LENGTH + SEGMENT DESCRIPTOR LIST LENGTH
882 */
883 tdll = get_unaligned_be16(&p[2]);
884 sdll = get_unaligned_be32(&p[8]);
885
886 inline_dl = get_unaligned_be32(&p[12]);
887 if (inline_dl != 0) {
888 pr_err("XCOPY with non zero inline data length\n");
889 goto out;
890 }
891
892 pr_debug("Processing XCOPY with list_id: 0x%02x list_id_usage: 0x%02x"
893 " tdll: %hu sdll: %u inline_dl: %u\n", list_id, list_id_usage,
894 tdll, sdll, inline_dl);
895
896 rc = target_xcopy_parse_target_descriptors(se_cmd, xop, &p[16], tdll, &ret);
897 if (rc <= 0)
898 goto out;
899
900 if (xop->src_dev->dev_attrib.block_size !=
901 xop->dst_dev->dev_attrib.block_size) {
902 pr_err("XCOPY: Non matching src_dev block_size: %u + dst_dev"
903 " block_size: %u currently unsupported\n",
904 xop->src_dev->dev_attrib.block_size,
905 xop->dst_dev->dev_attrib.block_size);
906 xcopy_pt_undepend_remotedev(xop);
907 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
908 goto out;
909 }
910
911 pr_debug("XCOPY: Processed %d target descriptors, length: %u\n", rc,
912 rc * XCOPY_TARGET_DESC_LEN);
913 seg_desc = &p[16];
914 seg_desc += (rc * XCOPY_TARGET_DESC_LEN);
915
916 rc = target_xcopy_parse_segment_descriptors(se_cmd, xop, seg_desc, sdll);
917 if (rc <= 0) {
918 xcopy_pt_undepend_remotedev(xop);
919 goto out;
920 }
921 transport_kunmap_data_sg(se_cmd);
922
923 pr_debug("XCOPY: Processed %d segment descriptors, length: %u\n", rc,
924 rc * XCOPY_SEGMENT_DESC_LEN);
925 INIT_WORK(&xop->xop_work, target_xcopy_do_work);
926 queue_work(xcopy_wq, &xop->xop_work);
927 return TCM_NO_SENSE;
928
929 out:
930 if (p)
931 transport_kunmap_data_sg(se_cmd);
932 kfree(xop);
933 return ret;
934 }
935
936 static sense_reason_t target_rcr_operating_parameters(struct se_cmd *se_cmd)
937 {
938 unsigned char *p;
939
940 p = transport_kmap_data_sg(se_cmd);
941 if (!p) {
942 pr_err("transport_kmap_data_sg failed in"
943 " target_rcr_operating_parameters\n");
944 return TCM_OUT_OF_RESOURCES;
945 }
946
947 if (se_cmd->data_length < 54) {
948 pr_err("Receive Copy Results Op Parameters length"
949 " too small: %u\n", se_cmd->data_length);
950 transport_kunmap_data_sg(se_cmd);
951 return TCM_INVALID_CDB_FIELD;
952 }
953 /*
954 * Set SNLID=1 (Supports no List ID)
955 */
956 p[4] = 0x1;
957 /*
958 * MAXIMUM TARGET DESCRIPTOR COUNT
959 */
960 put_unaligned_be16(RCR_OP_MAX_TARGET_DESC_COUNT, &p[8]);
961 /*
962 * MAXIMUM SEGMENT DESCRIPTOR COUNT
963 */
964 put_unaligned_be16(RCR_OP_MAX_SG_DESC_COUNT, &p[10]);
965 /*
966 * MAXIMUM DESCRIPTOR LIST LENGTH
967 */
968 put_unaligned_be32(RCR_OP_MAX_DESC_LIST_LEN, &p[12]);
969 /*
970 * MAXIMUM SEGMENT LENGTH
971 */
972 put_unaligned_be32(RCR_OP_MAX_SEGMENT_LEN, &p[16]);
973 /*
974 * MAXIMUM INLINE DATA LENGTH for SA 0x04 (NOT SUPPORTED)
975 */
976 put_unaligned_be32(0x0, &p[20]);
977 /*
978 * HELD DATA LIMIT
979 */
980 put_unaligned_be32(0x0, &p[24]);
981 /*
982 * MAXIMUM STREAM DEVICE TRANSFER SIZE
983 */
984 put_unaligned_be32(0x0, &p[28]);
985 /*
986 * TOTAL CONCURRENT COPIES
987 */
988 put_unaligned_be16(RCR_OP_TOTAL_CONCURR_COPIES, &p[34]);
989 /*
990 * MAXIMUM CONCURRENT COPIES
991 */
992 p[36] = RCR_OP_MAX_CONCURR_COPIES;
993 /*
994 * DATA SEGMENT GRANULARITY (log 2)
995 */
996 p[37] = RCR_OP_DATA_SEG_GRAN_LOG2;
997 /*
998 * INLINE DATA GRANULARITY log 2)
999 */
1000 p[38] = RCR_OP_INLINE_DATA_GRAN_LOG2;
1001 /*
1002 * HELD DATA GRANULARITY
1003 */
1004 p[39] = RCR_OP_HELD_DATA_GRAN_LOG2;
1005 /*
1006 * IMPLEMENTED DESCRIPTOR LIST LENGTH
1007 */
1008 p[43] = 0x2;
1009 /*
1010 * List of implemented descriptor type codes (ordered)
1011 */
1012 p[44] = 0x02; /* Copy Block to Block device */
1013 p[45] = 0xe4; /* Identification descriptor target descriptor */
1014
1015 /*
1016 * AVAILABLE DATA (n-3)
1017 */
1018 put_unaligned_be32(42, &p[0]);
1019
1020 transport_kunmap_data_sg(se_cmd);
1021 target_complete_cmd(se_cmd, GOOD);
1022
1023 return TCM_NO_SENSE;
1024 }
1025
1026 sense_reason_t target_do_receive_copy_results(struct se_cmd *se_cmd)
1027 {
1028 unsigned char *cdb = &se_cmd->t_task_cdb[0];
1029 int sa = (cdb[1] & 0x1f), list_id = cdb[2];
1030 sense_reason_t rc = TCM_NO_SENSE;
1031
1032 pr_debug("Entering target_do_receive_copy_results: SA: 0x%02x, List ID:"
1033 " 0x%02x, AL: %u\n", sa, list_id, se_cmd->data_length);
1034
1035 if (list_id != 0) {
1036 pr_err("Receive Copy Results with non zero list identifier"
1037 " not supported\n");
1038 return TCM_INVALID_CDB_FIELD;
1039 }
1040
1041 switch (sa) {
1042 case RCR_SA_OPERATING_PARAMETERS:
1043 rc = target_rcr_operating_parameters(se_cmd);
1044 break;
1045 case RCR_SA_COPY_STATUS:
1046 case RCR_SA_RECEIVE_DATA:
1047 case RCR_SA_FAILED_SEGMENT_DETAILS:
1048 default:
1049 pr_err("Unsupported SA for receive copy results: 0x%02x\n", sa);
1050 return TCM_INVALID_CDB_FIELD;
1051 }
1052
1053 return rc;
1054 }
Linux with added FPC-III support