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[deliverable/linux.git] / drivers / target / target_core_xcopy.c
1 /*******************************************************************************
2 * Filename: target_core_xcopy.c
3 *
4 * This file contains support for SPC-4 Extended-Copy offload with generic
5 * TCM backends.
6 *
7 * Copyright (c) 2011-2013 Datera, Inc. All rights reserved.
8 *
9 * Author:
10 * Nicholas A. Bellinger <nab@daterainc.com>
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
16 *
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
21 *
22 ******************************************************************************/
23
24 #include <linux/version.h>
25 #include <linux/slab.h>
26 #include <linux/spinlock.h>
27 #include <linux/list.h>
28 #include <linux/configfs.h>
29 #include <scsi/scsi.h>
30 #include <scsi/scsi_cmnd.h>
31 #include <asm/unaligned.h>
32
33 #include <target/target_core_base.h>
34 #include <target/target_core_backend.h>
35 #include <target/target_core_fabric.h>
36 #include <target/target_core_configfs.h>
37
38 #include "target_core_pr.h"
39 #include "target_core_ua.h"
40 #include "target_core_xcopy.h"
41
42 static struct workqueue_struct *xcopy_wq = NULL;
43 /*
44 * From target_core_spc.c
45 */
46 extern void spc_parse_naa_6h_vendor_specific(struct se_device *, unsigned char *);
47 /*
48 * From target_core_device.c
49 */
50 extern struct mutex g_device_mutex;
51 extern struct list_head g_device_list;
52 /*
53 * From target_core_configfs.c
54 */
55 extern struct configfs_subsystem *target_core_subsystem[];
56
57 static int target_xcopy_gen_naa_ieee(struct se_device *dev, unsigned char *buf)
58 {
59 int off = 0;
60
61 buf[off++] = (0x6 << 4);
62 buf[off++] = 0x01;
63 buf[off++] = 0x40;
64 buf[off] = (0x5 << 4);
65
66 spc_parse_naa_6h_vendor_specific(dev, &buf[off]);
67 return 0;
68 }
69
70 static int target_xcopy_locate_se_dev_e4(struct se_cmd *se_cmd, struct xcopy_op *xop,
71 bool src)
72 {
73 struct se_device *se_dev;
74 struct configfs_subsystem *subsys = target_core_subsystem[0];
75 unsigned char tmp_dev_wwn[XCOPY_NAA_IEEE_REGEX_LEN], *dev_wwn;
76 int rc;
77
78 if (src == true)
79 dev_wwn = &xop->dst_tid_wwn[0];
80 else
81 dev_wwn = &xop->src_tid_wwn[0];
82
83 mutex_lock(&g_device_mutex);
84 list_for_each_entry(se_dev, &g_device_list, g_dev_node) {
85
86 memset(&tmp_dev_wwn[0], 0, XCOPY_NAA_IEEE_REGEX_LEN);
87 target_xcopy_gen_naa_ieee(se_dev, &tmp_dev_wwn[0]);
88
89 rc = memcmp(&tmp_dev_wwn[0], dev_wwn, XCOPY_NAA_IEEE_REGEX_LEN);
90 if (rc != 0)
91 continue;
92
93 if (src == true) {
94 xop->dst_dev = se_dev;
95 pr_debug("XCOPY 0xe4: Setting xop->dst_dev: %p from located"
96 " se_dev\n", xop->dst_dev);
97 } else {
98 xop->src_dev = se_dev;
99 pr_debug("XCOPY 0xe4: Setting xop->src_dev: %p from located"
100 " se_dev\n", xop->src_dev);
101 }
102
103 rc = configfs_depend_item(subsys,
104 &se_dev->dev_group.cg_item);
105 if (rc != 0) {
106 pr_err("configfs_depend_item attempt failed:"
107 " %d for se_dev: %p\n", rc, se_dev);
108 mutex_unlock(&g_device_mutex);
109 return rc;
110 }
111
112 pr_debug("Called configfs_depend_item for subsys: %p se_dev: %p"
113 " se_dev->se_dev_group: %p\n", subsys, se_dev,
114 &se_dev->dev_group);
115
116 mutex_unlock(&g_device_mutex);
117 return 0;
118 }
119 mutex_unlock(&g_device_mutex);
120
121 pr_err("Unable to locate 0xe4 descriptor for EXTENDED_COPY\n");
122 return -EINVAL;
123 }
124
125 static int target_xcopy_parse_tiddesc_e4(struct se_cmd *se_cmd, struct xcopy_op *xop,
126 unsigned char *p, bool src)
127 {
128 unsigned char *desc = p;
129 unsigned short ript;
130 u8 desig_len;
131 /*
132 * Extract RELATIVE INITIATOR PORT IDENTIFIER
133 */
134 ript = get_unaligned_be16(&desc[2]);
135 pr_debug("XCOPY 0xe4: RELATIVE INITIATOR PORT IDENTIFIER: %hu\n", ript);
136 /*
137 * Check for supported code set, association, and designator type
138 */
139 if ((desc[4] & 0x0f) != 0x1) {
140 pr_err("XCOPY 0xe4: code set of non binary type not supported\n");
141 return -EINVAL;
142 }
143 if ((desc[5] & 0x30) != 0x00) {
144 pr_err("XCOPY 0xe4: association other than LUN not supported\n");
145 return -EINVAL;
146 }
147 if ((desc[5] & 0x0f) != 0x3) {
148 pr_err("XCOPY 0xe4: designator type unsupported: 0x%02x\n",
149 (desc[5] & 0x0f));
150 return -EINVAL;
151 }
152 /*
153 * Check for matching 16 byte length for NAA IEEE Registered Extended
154 * Assigned designator
155 */
156 desig_len = desc[7];
157 if (desig_len != 16) {
158 pr_err("XCOPY 0xe4: invalid desig_len: %d\n", (int)desig_len);
159 return -EINVAL;
160 }
161 pr_debug("XCOPY 0xe4: desig_len: %d\n", (int)desig_len);
162 /*
163 * Check for NAA IEEE Registered Extended Assigned header..
164 */
165 if ((desc[8] & 0xf0) != 0x60) {
166 pr_err("XCOPY 0xe4: Unsupported DESIGNATOR TYPE: 0x%02x\n",
167 (desc[8] & 0xf0));
168 return -EINVAL;
169 }
170
171 if (src == true) {
172 memcpy(&xop->src_tid_wwn[0], &desc[8], XCOPY_NAA_IEEE_REGEX_LEN);
173 /*
174 * Determine if the source designator matches the local device
175 */
176 if (!memcmp(&xop->local_dev_wwn[0], &xop->src_tid_wwn[0],
177 XCOPY_NAA_IEEE_REGEX_LEN)) {
178 xop->op_origin = XCOL_SOURCE_RECV_OP;
179 xop->src_dev = se_cmd->se_dev;
180 pr_debug("XCOPY 0xe4: Set xop->src_dev %p from source"
181 " received xop\n", xop->src_dev);
182 }
183 } else {
184 memcpy(&xop->dst_tid_wwn[0], &desc[8], XCOPY_NAA_IEEE_REGEX_LEN);
185 /*
186 * Determine if the destination designator matches the local device
187 */
188 if (!memcmp(&xop->local_dev_wwn[0], &xop->dst_tid_wwn[0],
189 XCOPY_NAA_IEEE_REGEX_LEN)) {
190 xop->op_origin = XCOL_DEST_RECV_OP;
191 xop->dst_dev = se_cmd->se_dev;
192 pr_debug("XCOPY 0xe4: Set xop->dst_dev: %p from destination"
193 " received xop\n", xop->dst_dev);
194 }
195 }
196
197 return 0;
198 }
199
200 static int target_xcopy_parse_target_descriptors(struct se_cmd *se_cmd,
201 struct xcopy_op *xop, unsigned char *p,
202 unsigned short tdll)
203 {
204 struct se_device *local_dev = se_cmd->se_dev;
205 unsigned char *desc = p;
206 int offset = tdll % XCOPY_TARGET_DESC_LEN, rc, ret = 0;
207 unsigned short start = 0;
208 bool src = true;
209
210 if (offset != 0) {
211 pr_err("XCOPY target descriptor list length is not"
212 " multiple of %d\n", XCOPY_TARGET_DESC_LEN);
213 return -EINVAL;
214 }
215 if (tdll > 64) {
216 pr_err("XCOPY target descriptor supports a maximum"
217 " two src/dest descriptors, tdll: %hu too large..\n", tdll);
218 return -EINVAL;
219 }
220 /*
221 * Generate an IEEE Registered Extended designator based upon the
222 * se_device the XCOPY was received upon..
223 */
224 memset(&xop->local_dev_wwn[0], 0, XCOPY_NAA_IEEE_REGEX_LEN);
225 target_xcopy_gen_naa_ieee(local_dev, &xop->local_dev_wwn[0]);
226
227 while (start < tdll) {
228 /*
229 * Check target descriptor identification with 0xE4 type with
230 * use VPD 0x83 WWPN matching ..
231 */
232 switch (desc[0]) {
233 case 0xe4:
234 rc = target_xcopy_parse_tiddesc_e4(se_cmd, xop,
235 &desc[0], src);
236 if (rc != 0)
237 goto out;
238 /*
239 * Assume target descriptors are in source -> destination order..
240 */
241 if (src == true)
242 src = false;
243 else
244 src = true;
245 start += XCOPY_TARGET_DESC_LEN;
246 desc += XCOPY_TARGET_DESC_LEN;
247 ret++;
248 break;
249 default:
250 pr_err("XCOPY unsupported descriptor type code:"
251 " 0x%02x\n", desc[0]);
252 goto out;
253 }
254 }
255
256 if (xop->op_origin == XCOL_SOURCE_RECV_OP)
257 rc = target_xcopy_locate_se_dev_e4(se_cmd, xop, true);
258 else
259 rc = target_xcopy_locate_se_dev_e4(se_cmd, xop, false);
260
261 if (rc < 0)
262 goto out;
263
264 pr_debug("XCOPY TGT desc: Source dev: %p NAA IEEE WWN: 0x%16phN\n",
265 xop->src_dev, &xop->src_tid_wwn[0]);
266 pr_debug("XCOPY TGT desc: Dest dev: %p NAA IEEE WWN: 0x%16phN\n",
267 xop->dst_dev, &xop->dst_tid_wwn[0]);
268
269 return ret;
270
271 out:
272 return -EINVAL;
273 }
274
275 static int target_xcopy_parse_segdesc_02(struct se_cmd *se_cmd, struct xcopy_op *xop,
276 unsigned char *p)
277 {
278 unsigned char *desc = p;
279 int dc = (desc[1] & 0x02);
280 unsigned short desc_len;
281
282 desc_len = get_unaligned_be16(&desc[2]);
283 if (desc_len != 0x18) {
284 pr_err("XCOPY segment desc 0x02: Illegal desc_len:"
285 " %hu\n", desc_len);
286 return -EINVAL;
287 }
288
289 xop->stdi = get_unaligned_be16(&desc[4]);
290 xop->dtdi = get_unaligned_be16(&desc[6]);
291 pr_debug("XCOPY seg desc 0x02: desc_len: %hu stdi: %hu dtdi: %hu, DC: %d\n",
292 desc_len, xop->stdi, xop->dtdi, dc);
293
294 xop->nolb = get_unaligned_be16(&desc[10]);
295 xop->src_lba = get_unaligned_be64(&desc[12]);
296 xop->dst_lba = get_unaligned_be64(&desc[20]);
297 pr_debug("XCOPY seg desc 0x02: nolb: %hu src_lba: %llu dst_lba: %llu\n",
298 xop->nolb, (unsigned long long)xop->src_lba,
299 (unsigned long long)xop->dst_lba);
300
301 if (dc != 0) {
302 xop->dbl = (desc[29] << 16) & 0xff;
303 xop->dbl |= (desc[30] << 8) & 0xff;
304 xop->dbl |= desc[31] & 0xff;
305
306 pr_debug("XCOPY seg desc 0x02: DC=1 w/ dbl: %u\n", xop->dbl);
307 }
308 return 0;
309 }
310
311 static int target_xcopy_parse_segment_descriptors(struct se_cmd *se_cmd,
312 struct xcopy_op *xop, unsigned char *p,
313 unsigned int sdll)
314 {
315 unsigned char *desc = p;
316 unsigned int start = 0;
317 int offset = sdll % XCOPY_SEGMENT_DESC_LEN, rc, ret = 0;
318
319 if (offset != 0) {
320 pr_err("XCOPY segment descriptor list length is not"
321 " multiple of %d\n", XCOPY_SEGMENT_DESC_LEN);
322 return -EINVAL;
323 }
324
325 while (start < sdll) {
326 /*
327 * Check segment descriptor type code for block -> block
328 */
329 switch (desc[0]) {
330 case 0x02:
331 rc = target_xcopy_parse_segdesc_02(se_cmd, xop, desc);
332 if (rc < 0)
333 goto out;
334
335 ret++;
336 start += XCOPY_SEGMENT_DESC_LEN;
337 desc += XCOPY_SEGMENT_DESC_LEN;
338 break;
339 default:
340 pr_err("XCOPY unspported segment descriptor"
341 "type: 0x%02x\n", desc[0]);
342 goto out;
343 }
344 }
345
346 return ret;
347
348 out:
349 return -EINVAL;
350 }
351
352 /*
353 * Start xcopy_pt ops
354 */
355
356 struct xcopy_pt_cmd {
357 bool remote_port;
358 struct se_cmd se_cmd;
359 struct xcopy_op *xcopy_op;
360 struct completion xpt_passthrough_sem;
361 };
362
363 static struct se_port xcopy_pt_port;
364 static struct se_portal_group xcopy_pt_tpg;
365 static struct se_session xcopy_pt_sess;
366 static struct se_node_acl xcopy_pt_nacl;
367
368 static char *xcopy_pt_get_fabric_name(void)
369 {
370 return "xcopy-pt";
371 }
372
373 static u32 xcopy_pt_get_tag(struct se_cmd *se_cmd)
374 {
375 return 0;
376 }
377
378 static int xcopy_pt_get_cmd_state(struct se_cmd *se_cmd)
379 {
380 return 0;
381 }
382
383 static void xcopy_pt_undepend_remotedev(struct xcopy_op *xop)
384 {
385 struct configfs_subsystem *subsys = target_core_subsystem[0];
386 struct se_device *remote_dev;
387
388 if (xop->op_origin == XCOL_SOURCE_RECV_OP)
389 remote_dev = xop->dst_dev;
390 else
391 remote_dev = xop->src_dev;
392
393 pr_debug("Calling configfs_undepend_item for subsys: %p"
394 " remote_dev: %p remote_dev->dev_group: %p\n",
395 subsys, remote_dev, &remote_dev->dev_group.cg_item);
396
397 configfs_undepend_item(subsys, &remote_dev->dev_group.cg_item);
398 }
399
400 static void xcopy_pt_release_cmd(struct se_cmd *se_cmd)
401 {
402 struct xcopy_pt_cmd *xpt_cmd = container_of(se_cmd,
403 struct xcopy_pt_cmd, se_cmd);
404
405 if (xpt_cmd->remote_port)
406 kfree(se_cmd->se_lun);
407
408 kfree(xpt_cmd);
409 }
410
411 static int xcopy_pt_check_stop_free(struct se_cmd *se_cmd)
412 {
413 struct xcopy_pt_cmd *xpt_cmd = container_of(se_cmd,
414 struct xcopy_pt_cmd, se_cmd);
415
416 complete(&xpt_cmd->xpt_passthrough_sem);
417 return 0;
418 }
419
420 static int xcopy_pt_write_pending(struct se_cmd *se_cmd)
421 {
422 return 0;
423 }
424
425 static int xcopy_pt_write_pending_status(struct se_cmd *se_cmd)
426 {
427 return 0;
428 }
429
430 static int xcopy_pt_queue_data_in(struct se_cmd *se_cmd)
431 {
432 return 0;
433 }
434
435 static int xcopy_pt_queue_status(struct se_cmd *se_cmd)
436 {
437 return 0;
438 }
439
440 static struct target_core_fabric_ops xcopy_pt_tfo = {
441 .get_fabric_name = xcopy_pt_get_fabric_name,
442 .get_task_tag = xcopy_pt_get_tag,
443 .get_cmd_state = xcopy_pt_get_cmd_state,
444 .release_cmd = xcopy_pt_release_cmd,
445 .check_stop_free = xcopy_pt_check_stop_free,
446 .write_pending = xcopy_pt_write_pending,
447 .write_pending_status = xcopy_pt_write_pending_status,
448 .queue_data_in = xcopy_pt_queue_data_in,
449 .queue_status = xcopy_pt_queue_status,
450 };
451
452 /*
453 * End xcopy_pt_ops
454 */
455
456 int target_xcopy_setup_pt(void)
457 {
458 xcopy_wq = alloc_workqueue("xcopy_wq", WQ_MEM_RECLAIM, 0);
459 if (!xcopy_wq) {
460 pr_err("Unable to allocate xcopy_wq\n");
461 return -ENOMEM;
462 }
463
464 memset(&xcopy_pt_port, 0, sizeof(struct se_port));
465 INIT_LIST_HEAD(&xcopy_pt_port.sep_alua_list);
466 INIT_LIST_HEAD(&xcopy_pt_port.sep_list);
467 mutex_init(&xcopy_pt_port.sep_tg_pt_md_mutex);
468
469 memset(&xcopy_pt_tpg, 0, sizeof(struct se_portal_group));
470 INIT_LIST_HEAD(&xcopy_pt_tpg.se_tpg_node);
471 INIT_LIST_HEAD(&xcopy_pt_tpg.acl_node_list);
472 INIT_LIST_HEAD(&xcopy_pt_tpg.tpg_sess_list);
473
474 xcopy_pt_port.sep_tpg = &xcopy_pt_tpg;
475 xcopy_pt_tpg.se_tpg_tfo = &xcopy_pt_tfo;
476
477 memset(&xcopy_pt_nacl, 0, sizeof(struct se_node_acl));
478 INIT_LIST_HEAD(&xcopy_pt_nacl.acl_list);
479 INIT_LIST_HEAD(&xcopy_pt_nacl.acl_sess_list);
480 memset(&xcopy_pt_sess, 0, sizeof(struct se_session));
481 INIT_LIST_HEAD(&xcopy_pt_sess.sess_list);
482 INIT_LIST_HEAD(&xcopy_pt_sess.sess_acl_list);
483
484 xcopy_pt_nacl.se_tpg = &xcopy_pt_tpg;
485 xcopy_pt_nacl.nacl_sess = &xcopy_pt_sess;
486
487 xcopy_pt_sess.se_tpg = &xcopy_pt_tpg;
488 xcopy_pt_sess.se_node_acl = &xcopy_pt_nacl;
489
490 return 0;
491 }
492
493 void target_xcopy_release_pt(void)
494 {
495 if (xcopy_wq)
496 destroy_workqueue(xcopy_wq);
497 }
498
499 static void target_xcopy_setup_pt_port(
500 struct xcopy_pt_cmd *xpt_cmd,
501 struct xcopy_op *xop,
502 bool remote_port)
503 {
504 struct se_cmd *ec_cmd = xop->xop_se_cmd;
505 struct se_cmd *pt_cmd = &xpt_cmd->se_cmd;
506
507 if (xop->op_origin == XCOL_SOURCE_RECV_OP) {
508 /*
509 * Honor destination port reservations for X-COPY PUSH emulation
510 * when CDB is received on local source port, and READs blocks to
511 * WRITE on remote destination port.
512 */
513 if (remote_port) {
514 xpt_cmd->remote_port = remote_port;
515 pt_cmd->se_lun->lun_sep = &xcopy_pt_port;
516 pr_debug("Setup emulated remote DEST xcopy_pt_port: %p to"
517 " cmd->se_lun->lun_sep for X-COPY data PUSH\n",
518 pt_cmd->se_lun->lun_sep);
519 } else {
520 pt_cmd->se_lun = ec_cmd->se_lun;
521 pt_cmd->se_dev = ec_cmd->se_dev;
522
523 pr_debug("Honoring local SRC port from ec_cmd->se_dev:"
524 " %p\n", pt_cmd->se_dev);
525 pt_cmd->se_lun = ec_cmd->se_lun;
526 pr_debug("Honoring local SRC port from ec_cmd->se_lun: %p\n",
527 pt_cmd->se_lun);
528 }
529 } else {
530 /*
531 * Honor source port reservation for X-COPY PULL emulation
532 * when CDB is received on local desintation port, and READs
533 * blocks from the remote source port to WRITE on local
534 * destination port.
535 */
536 if (remote_port) {
537 xpt_cmd->remote_port = remote_port;
538 pt_cmd->se_lun->lun_sep = &xcopy_pt_port;
539 pr_debug("Setup emulated remote SRC xcopy_pt_port: %p to"
540 " cmd->se_lun->lun_sep for X-COPY data PULL\n",
541 pt_cmd->se_lun->lun_sep);
542 } else {
543 pt_cmd->se_lun = ec_cmd->se_lun;
544 pt_cmd->se_dev = ec_cmd->se_dev;
545
546 pr_debug("Honoring local DST port from ec_cmd->se_dev:"
547 " %p\n", pt_cmd->se_dev);
548 pt_cmd->se_lun = ec_cmd->se_lun;
549 pr_debug("Honoring local DST port from ec_cmd->se_lun: %p\n",
550 pt_cmd->se_lun);
551 }
552 }
553 }
554
555 static int target_xcopy_init_pt_lun(
556 struct xcopy_pt_cmd *xpt_cmd,
557 struct xcopy_op *xop,
558 struct se_device *se_dev,
559 struct se_cmd *pt_cmd,
560 bool remote_port)
561 {
562 /*
563 * Don't allocate + init an pt_cmd->se_lun if honoring local port for
564 * reservations. The pt_cmd->se_lun pointer will be setup from within
565 * target_xcopy_setup_pt_port()
566 */
567 if (remote_port == false) {
568 pt_cmd->se_cmd_flags |= SCF_SE_LUN_CMD | SCF_CMD_XCOPY_PASSTHROUGH;
569 return 0;
570 }
571
572 pt_cmd->se_lun = kzalloc(sizeof(struct se_lun), GFP_KERNEL);
573 if (!pt_cmd->se_lun) {
574 pr_err("Unable to allocate pt_cmd->se_lun\n");
575 return -ENOMEM;
576 }
577 init_completion(&pt_cmd->se_lun->lun_shutdown_comp);
578 INIT_LIST_HEAD(&pt_cmd->se_lun->lun_cmd_list);
579 INIT_LIST_HEAD(&pt_cmd->se_lun->lun_acl_list);
580 spin_lock_init(&pt_cmd->se_lun->lun_acl_lock);
581 spin_lock_init(&pt_cmd->se_lun->lun_cmd_lock);
582 spin_lock_init(&pt_cmd->se_lun->lun_sep_lock);
583
584 pt_cmd->se_dev = se_dev;
585
586 pr_debug("Setup emulated se_dev: %p from se_dev\n", pt_cmd->se_dev);
587 pt_cmd->se_lun->lun_se_dev = se_dev;
588 pt_cmd->se_cmd_flags |= SCF_SE_LUN_CMD | SCF_CMD_XCOPY_PASSTHROUGH;
589
590 pr_debug("Setup emulated se_dev: %p to pt_cmd->se_lun->lun_se_dev\n",
591 pt_cmd->se_lun->lun_se_dev);
592
593 return 0;
594 }
595
596 static int target_xcopy_setup_pt_cmd(
597 struct xcopy_pt_cmd *xpt_cmd,
598 struct xcopy_op *xop,
599 struct se_device *se_dev,
600 unsigned char *cdb,
601 bool remote_port,
602 bool alloc_mem)
603 {
604 struct se_cmd *cmd = &xpt_cmd->se_cmd;
605 sense_reason_t sense_rc;
606 int ret = 0, rc;
607 /*
608 * Setup LUN+port to honor reservations based upon xop->op_origin for
609 * X-COPY PUSH or X-COPY PULL based upon where the CDB was received.
610 */
611 rc = target_xcopy_init_pt_lun(xpt_cmd, xop, se_dev, cmd, remote_port);
612 if (rc < 0) {
613 ret = rc;
614 goto out;
615 }
616 xpt_cmd->xcopy_op = xop;
617 target_xcopy_setup_pt_port(xpt_cmd, xop, remote_port);
618
619 sense_rc = target_setup_cmd_from_cdb(cmd, cdb);
620 if (sense_rc) {
621 ret = -EINVAL;
622 goto out;
623 }
624
625 if (alloc_mem) {
626 rc = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents,
627 cmd->data_length, false);
628 if (rc < 0) {
629 ret = rc;
630 goto out;
631 }
632 /*
633 * Set this bit so that transport_free_pages() allows the
634 * caller to release SGLs + physical memory allocated by
635 * transport_generic_get_mem()..
636 */
637 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
638 } else {
639 /*
640 * Here the previously allocated SGLs for the internal READ
641 * are mapped zero-copy to the internal WRITE.
642 */
643 sense_rc = transport_generic_map_mem_to_cmd(cmd,
644 xop->xop_data_sg, xop->xop_data_nents,
645 NULL, 0);
646 if (sense_rc) {
647 ret = -EINVAL;
648 goto out;
649 }
650
651 pr_debug("Setup PASSTHROUGH_NOALLOC t_data_sg: %p t_data_nents:"
652 " %u\n", cmd->t_data_sg, cmd->t_data_nents);
653 }
654
655 return 0;
656
657 out:
658 if (remote_port == true)
659 kfree(cmd->se_lun);
660 return ret;
661 }
662
663 static int target_xcopy_issue_pt_cmd(struct xcopy_pt_cmd *xpt_cmd)
664 {
665 struct se_cmd *se_cmd = &xpt_cmd->se_cmd;
666 sense_reason_t sense_rc;
667
668 sense_rc = transport_generic_new_cmd(se_cmd);
669 if (sense_rc)
670 return -EINVAL;
671
672 if (se_cmd->data_direction == DMA_TO_DEVICE)
673 target_execute_cmd(se_cmd);
674
675 wait_for_completion_interruptible(&xpt_cmd->xpt_passthrough_sem);
676
677 pr_debug("target_xcopy_issue_pt_cmd(): SCSI status: 0x%02x\n",
678 se_cmd->scsi_status);
679 return 0;
680 }
681
682 static int target_xcopy_read_source(
683 struct se_cmd *ec_cmd,
684 struct xcopy_op *xop,
685 struct se_device *src_dev,
686 sector_t src_lba,
687 u32 src_sectors)
688 {
689 struct xcopy_pt_cmd *xpt_cmd;
690 struct se_cmd *se_cmd;
691 u32 length = (src_sectors * src_dev->dev_attrib.block_size);
692 int rc;
693 unsigned char cdb[16];
694 bool remote_port = (xop->op_origin == XCOL_DEST_RECV_OP);
695
696 xpt_cmd = kzalloc(sizeof(struct xcopy_pt_cmd), GFP_KERNEL);
697 if (!xpt_cmd) {
698 pr_err("Unable to allocate xcopy_pt_cmd\n");
699 return -ENOMEM;
700 }
701 init_completion(&xpt_cmd->xpt_passthrough_sem);
702 se_cmd = &xpt_cmd->se_cmd;
703
704 memset(&cdb[0], 0, 16);
705 cdb[0] = READ_16;
706 put_unaligned_be64(src_lba, &cdb[2]);
707 put_unaligned_be32(src_sectors, &cdb[10]);
708 pr_debug("XCOPY: Built READ_16: LBA: %llu Sectors: %u Length: %u\n",
709 (unsigned long long)src_lba, src_sectors, length);
710
711 transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, NULL, length,
712 DMA_FROM_DEVICE, 0, NULL);
713 xop->src_pt_cmd = xpt_cmd;
714
715 rc = target_xcopy_setup_pt_cmd(xpt_cmd, xop, src_dev, &cdb[0],
716 remote_port, true);
717 if (rc < 0) {
718 transport_generic_free_cmd(se_cmd, 0);
719 return rc;
720 }
721
722 xop->xop_data_sg = se_cmd->t_data_sg;
723 xop->xop_data_nents = se_cmd->t_data_nents;
724 pr_debug("XCOPY-READ: Saved xop->xop_data_sg: %p, num: %u for READ"
725 " memory\n", xop->xop_data_sg, xop->xop_data_nents);
726
727 rc = target_xcopy_issue_pt_cmd(xpt_cmd);
728 if (rc < 0) {
729 transport_generic_free_cmd(se_cmd, 0);
730 return rc;
731 }
732 /*
733 * Clear off the allocated t_data_sg, that has been saved for
734 * zero-copy WRITE submission reuse in struct xcopy_op..
735 */
736 se_cmd->t_data_sg = NULL;
737 se_cmd->t_data_nents = 0;
738
739 return 0;
740 }
741
742 static int target_xcopy_write_destination(
743 struct se_cmd *ec_cmd,
744 struct xcopy_op *xop,
745 struct se_device *dst_dev,
746 sector_t dst_lba,
747 u32 dst_sectors)
748 {
749 struct xcopy_pt_cmd *xpt_cmd;
750 struct se_cmd *se_cmd;
751 u32 length = (dst_sectors * dst_dev->dev_attrib.block_size);
752 int rc;
753 unsigned char cdb[16];
754 bool remote_port = (xop->op_origin == XCOL_SOURCE_RECV_OP);
755
756 xpt_cmd = kzalloc(sizeof(struct xcopy_pt_cmd), GFP_KERNEL);
757 if (!xpt_cmd) {
758 pr_err("Unable to allocate xcopy_pt_cmd\n");
759 return -ENOMEM;
760 }
761 init_completion(&xpt_cmd->xpt_passthrough_sem);
762 se_cmd = &xpt_cmd->se_cmd;
763
764 memset(&cdb[0], 0, 16);
765 cdb[0] = WRITE_16;
766 put_unaligned_be64(dst_lba, &cdb[2]);
767 put_unaligned_be32(dst_sectors, &cdb[10]);
768 pr_debug("XCOPY: Built WRITE_16: LBA: %llu Sectors: %u Length: %u\n",
769 (unsigned long long)dst_lba, dst_sectors, length);
770
771 transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, NULL, length,
772 DMA_TO_DEVICE, 0, NULL);
773 xop->dst_pt_cmd = xpt_cmd;
774
775 rc = target_xcopy_setup_pt_cmd(xpt_cmd, xop, dst_dev, &cdb[0],
776 remote_port, false);
777 if (rc < 0) {
778 struct se_cmd *src_cmd = &xop->src_pt_cmd->se_cmd;
779 /*
780 * If the failure happened before the t_mem_list hand-off in
781 * target_xcopy_setup_pt_cmd(), Reset memory + clear flag so that
782 * core releases this memory on error during X-COPY WRITE I/O.
783 */
784 src_cmd->se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
785 src_cmd->t_data_sg = xop->xop_data_sg;
786 src_cmd->t_data_nents = xop->xop_data_nents;
787
788 transport_generic_free_cmd(se_cmd, 0);
789 return rc;
790 }
791
792 rc = target_xcopy_issue_pt_cmd(xpt_cmd);
793 if (rc < 0) {
794 se_cmd->se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
795 transport_generic_free_cmd(se_cmd, 0);
796 return rc;
797 }
798
799 return 0;
800 }
801
802 static void target_xcopy_do_work(struct work_struct *work)
803 {
804 struct xcopy_op *xop = container_of(work, struct xcopy_op, xop_work);
805 struct se_device *src_dev = xop->src_dev, *dst_dev = xop->dst_dev;
806 struct se_cmd *ec_cmd = xop->xop_se_cmd;
807 sector_t src_lba = xop->src_lba, dst_lba = xop->dst_lba, end_lba;
808 unsigned int max_sectors;
809 int rc;
810 unsigned short nolb = xop->nolb, cur_nolb, max_nolb, copied_nolb = 0;
811
812 end_lba = src_lba + nolb;
813 /*
814 * Break up XCOPY I/O into hw_max_sectors sized I/O based on the
815 * smallest max_sectors between src_dev + dev_dev, or
816 */
817 max_sectors = min(src_dev->dev_attrib.hw_max_sectors,
818 dst_dev->dev_attrib.hw_max_sectors);
819 max_sectors = min_t(u32, max_sectors, XCOPY_MAX_SECTORS);
820
821 max_nolb = min_t(u16, max_sectors, ((u16)(~0U)));
822
823 pr_debug("target_xcopy_do_work: nolb: %hu, max_nolb: %hu end_lba: %llu\n",
824 nolb, max_nolb, (unsigned long long)end_lba);
825 pr_debug("target_xcopy_do_work: Starting src_lba: %llu, dst_lba: %llu\n",
826 (unsigned long long)src_lba, (unsigned long long)dst_lba);
827
828 while (src_lba < end_lba) {
829 cur_nolb = min(nolb, max_nolb);
830
831 pr_debug("target_xcopy_do_work: Calling read src_dev: %p src_lba: %llu,"
832 " cur_nolb: %hu\n", src_dev, (unsigned long long)src_lba, cur_nolb);
833
834 rc = target_xcopy_read_source(ec_cmd, xop, src_dev, src_lba, cur_nolb);
835 if (rc < 0)
836 goto out;
837
838 src_lba += cur_nolb;
839 pr_debug("target_xcopy_do_work: Incremented READ src_lba to %llu\n",
840 (unsigned long long)src_lba);
841
842 pr_debug("target_xcopy_do_work: Calling write dst_dev: %p dst_lba: %llu,"
843 " cur_nolb: %hu\n", dst_dev, (unsigned long long)dst_lba, cur_nolb);
844
845 rc = target_xcopy_write_destination(ec_cmd, xop, dst_dev,
846 dst_lba, cur_nolb);
847 if (rc < 0) {
848 transport_generic_free_cmd(&xop->src_pt_cmd->se_cmd, 0);
849 goto out;
850 }
851
852 dst_lba += cur_nolb;
853 pr_debug("target_xcopy_do_work: Incremented WRITE dst_lba to %llu\n",
854 (unsigned long long)dst_lba);
855
856 copied_nolb += cur_nolb;
857 nolb -= cur_nolb;
858
859 transport_generic_free_cmd(&xop->src_pt_cmd->se_cmd, 0);
860 xop->dst_pt_cmd->se_cmd.se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
861
862 transport_generic_free_cmd(&xop->dst_pt_cmd->se_cmd, 0);
863 }
864
865 xcopy_pt_undepend_remotedev(xop);
866 kfree(xop);
867
868 pr_debug("target_xcopy_do_work: Final src_lba: %llu, dst_lba: %llu\n",
869 (unsigned long long)src_lba, (unsigned long long)dst_lba);
870 pr_debug("target_xcopy_do_work: Blocks copied: %hu, Bytes Copied: %u\n",
871 copied_nolb, copied_nolb * dst_dev->dev_attrib.block_size);
872
873 pr_debug("target_xcopy_do_work: Setting X-COPY GOOD status -> sending response\n");
874 target_complete_cmd(ec_cmd, SAM_STAT_GOOD);
875 return;
876
877 out:
878 xcopy_pt_undepend_remotedev(xop);
879 kfree(xop);
880
881 pr_warn("target_xcopy_do_work: Setting X-COPY CHECK_CONDITION -> sending response\n");
882 ec_cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
883 target_complete_cmd(ec_cmd, SAM_STAT_CHECK_CONDITION);
884 }
885
886 sense_reason_t target_do_xcopy(struct se_cmd *se_cmd)
887 {
888 struct xcopy_op *xop = NULL;
889 unsigned char *p = NULL, *seg_desc;
890 unsigned int list_id, list_id_usage, sdll, inline_dl, sa;
891 int rc;
892 unsigned short tdll;
893
894 sa = se_cmd->t_task_cdb[1] & 0x1f;
895 if (sa != 0x00) {
896 pr_err("EXTENDED_COPY(LID4) not supported\n");
897 return TCM_UNSUPPORTED_SCSI_OPCODE;
898 }
899
900 p = transport_kmap_data_sg(se_cmd);
901 if (!p) {
902 pr_err("transport_kmap_data_sg() failed in target_do_xcopy\n");
903 return TCM_OUT_OF_RESOURCES;
904 }
905
906 list_id = p[0];
907 if (list_id != 0x00) {
908 pr_err("XCOPY with non zero list_id: 0x%02x\n", list_id);
909 goto out;
910 }
911 list_id_usage = (p[1] & 0x18);
912 /*
913 * Determine TARGET DESCRIPTOR LIST LENGTH + SEGMENT DESCRIPTOR LIST LENGTH
914 */
915 tdll = get_unaligned_be16(&p[2]);
916 sdll = get_unaligned_be32(&p[8]);
917
918 inline_dl = get_unaligned_be32(&p[12]);
919 if (inline_dl != 0) {
920 pr_err("XCOPY with non zero inline data length\n");
921 goto out;
922 }
923
924 xop = kzalloc(sizeof(struct xcopy_op), GFP_KERNEL);
925 if (!xop) {
926 pr_err("Unable to allocate xcopy_op\n");
927 goto out;
928 }
929 xop->xop_se_cmd = se_cmd;
930
931 pr_debug("Processing XCOPY with list_id: 0x%02x list_id_usage: 0x%02x"
932 " tdll: %hu sdll: %u inline_dl: %u\n", list_id, list_id_usage,
933 tdll, sdll, inline_dl);
934
935 rc = target_xcopy_parse_target_descriptors(se_cmd, xop, &p[16], tdll);
936 if (rc <= 0)
937 goto out;
938
939 pr_debug("XCOPY: Processed %d target descriptors, length: %u\n", rc,
940 rc * XCOPY_TARGET_DESC_LEN);
941 seg_desc = &p[16];
942 seg_desc += (rc * XCOPY_TARGET_DESC_LEN);
943
944 rc = target_xcopy_parse_segment_descriptors(se_cmd, xop, seg_desc, sdll);
945 if (rc <= 0) {
946 xcopy_pt_undepend_remotedev(xop);
947 goto out;
948 }
949 transport_kunmap_data_sg(se_cmd);
950
951 pr_debug("XCOPY: Processed %d segment descriptors, length: %u\n", rc,
952 rc * XCOPY_SEGMENT_DESC_LEN);
953 INIT_WORK(&xop->xop_work, target_xcopy_do_work);
954 queue_work(xcopy_wq, &xop->xop_work);
955 return TCM_NO_SENSE;
956
957 out:
958 if (p)
959 transport_kunmap_data_sg(se_cmd);
960 kfree(xop);
961 return TCM_INVALID_CDB_FIELD;
962 }
963
964 static sense_reason_t target_rcr_operating_parameters(struct se_cmd *se_cmd)
965 {
966 unsigned char *p;
967
968 p = transport_kmap_data_sg(se_cmd);
969 if (!p) {
970 pr_err("transport_kmap_data_sg failed in"
971 " target_rcr_operating_parameters\n");
972 return TCM_OUT_OF_RESOURCES;
973 }
974
975 if (se_cmd->data_length < 54) {
976 pr_err("Receive Copy Results Op Parameters length"
977 " too small: %u\n", se_cmd->data_length);
978 transport_kunmap_data_sg(se_cmd);
979 return TCM_INVALID_CDB_FIELD;
980 }
981 /*
982 * Set SNLID=1 (Supports no List ID)
983 */
984 p[4] = 0x1;
985 /*
986 * MAXIMUM TARGET DESCRIPTOR COUNT
987 */
988 put_unaligned_be16(RCR_OP_MAX_TARGET_DESC_COUNT, &p[8]);
989 /*
990 * MAXIMUM SEGMENT DESCRIPTOR COUNT
991 */
992 put_unaligned_be16(RCR_OP_MAX_SG_DESC_COUNT, &p[10]);
993 /*
994 * MAXIMUM DESCRIPTOR LIST LENGTH
995 */
996 put_unaligned_be32(RCR_OP_MAX_DESC_LIST_LEN, &p[12]);
997 /*
998 * MAXIMUM SEGMENT LENGTH
999 */
1000 put_unaligned_be32(RCR_OP_MAX_SEGMENT_LEN, &p[16]);
1001 /*
1002 * MAXIMUM INLINE DATA LENGTH for SA 0x04 (NOT SUPPORTED)
1003 */
1004 put_unaligned_be32(0x0, &p[20]);
1005 /*
1006 * HELD DATA LIMIT
1007 */
1008 put_unaligned_be32(0x0, &p[24]);
1009 /*
1010 * MAXIMUM STREAM DEVICE TRANSFER SIZE
1011 */
1012 put_unaligned_be32(0x0, &p[28]);
1013 /*
1014 * TOTAL CONCURRENT COPIES
1015 */
1016 put_unaligned_be16(RCR_OP_TOTAL_CONCURR_COPIES, &p[34]);
1017 /*
1018 * MAXIMUM CONCURRENT COPIES
1019 */
1020 p[36] = RCR_OP_MAX_CONCURR_COPIES;
1021 /*
1022 * DATA SEGMENT GRANULARITY (log 2)
1023 */
1024 p[37] = RCR_OP_DATA_SEG_GRAN_LOG2;
1025 /*
1026 * INLINE DATA GRANULARITY log 2)
1027 */
1028 p[38] = RCR_OP_INLINE_DATA_GRAN_LOG2;
1029 /*
1030 * HELD DATA GRANULARITY
1031 */
1032 p[39] = RCR_OP_HELD_DATA_GRAN_LOG2;
1033 /*
1034 * IMPLEMENTED DESCRIPTOR LIST LENGTH
1035 */
1036 p[43] = 0x2;
1037 /*
1038 * List of implemented descriptor type codes (ordered)
1039 */
1040 p[44] = 0x02; /* Copy Block to Block device */
1041 p[45] = 0xe4; /* Identification descriptor target descriptor */
1042
1043 /*
1044 * AVAILABLE DATA (n-3)
1045 */
1046 put_unaligned_be32(42, &p[0]);
1047
1048 transport_kunmap_data_sg(se_cmd);
1049 target_complete_cmd(se_cmd, GOOD);
1050
1051 return TCM_NO_SENSE;
1052 }
1053
1054 sense_reason_t target_do_receive_copy_results(struct se_cmd *se_cmd)
1055 {
1056 unsigned char *cdb = &se_cmd->t_task_cdb[0];
1057 int sa = (cdb[1] & 0x1f), list_id = cdb[2];
1058 sense_reason_t rc = TCM_NO_SENSE;
1059
1060 pr_debug("Entering target_do_receive_copy_results: SA: 0x%02x, List ID:"
1061 " 0x%02x, AL: %u\n", sa, list_id, se_cmd->data_length);
1062
1063 if (list_id != 0) {
1064 pr_err("Receive Copy Results with non zero list identifier"
1065 " not supported\n");
1066 return TCM_INVALID_CDB_FIELD;
1067 }
1068
1069 switch (sa) {
1070 case RCR_SA_OPERATING_PARAMETERS:
1071 rc = target_rcr_operating_parameters(se_cmd);
1072 break;
1073 case RCR_SA_COPY_STATUS:
1074 case RCR_SA_RECEIVE_DATA:
1075 case RCR_SA_FAILED_SEGMENT_DETAILS:
1076 default:
1077 pr_err("Unsupported SA for receive copy results: 0x%02x\n", sa);
1078 return TCM_INVALID_CDB_FIELD;
1079 }
1080
1081 return rc;
1082 }
Linux kernel - Deliverables
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