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target: move transport ID handling to the core
[mirror_ubuntu-bionic-kernel.git] / drivers / target / target_core_xcopy.c
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cbf031f4
NB		 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
cbf031f4
NB		 24#include <linux/slab.h>
25#include <linux/spinlock.h>
26#include <linux/list.h>
27#include <linux/configfs.h>
28#include <scsi/scsi.h>
29#include <scsi/scsi_cmnd.h>
30#include <asm/unaligned.h>
31
32#include <target/target_core_base.h>
33#include <target/target_core_backend.h>
34#include <target/target_core_fabric.h>
35#include <target/target_core_configfs.h>
36
b13876d2 37#include "target_core_internal.h"
cbf031f4
NB		 38#include "target_core_pr.h"
39#include "target_core_ua.h"
40#include "target_core_xcopy.h"
41
42static struct workqueue_struct *xcopy_wq = NULL;
cbf031f4
NB		 43
44static int target_xcopy_gen_naa_ieee(struct se_device *dev, unsigned char *buf)
45{
46 int off = 0;
47
48 buf[off++] = (0x6 << 4);
49 buf[off++] = 0x01;
50 buf[off++] = 0x40;
51 buf[off] = (0x5 << 4);
52
53 spc_parse_naa_6h_vendor_specific(dev, &buf[off]);
54 return 0;
55}
56
57static int target_xcopy_locate_se_dev_e4(struct se_cmd *se_cmd, struct xcopy_op *xop,
58 bool src)
59{
60 struct se_device *se_dev;
cbf031f4
NB		 61 unsigned char tmp_dev_wwn[XCOPY_NAA_IEEE_REGEX_LEN], *dev_wwn;
62 int rc;
63
0bcc297e 64 if (src)
cbf031f4
NB		 65 dev_wwn = &xop->dst_tid_wwn[0];
66 else
67 dev_wwn = &xop->src_tid_wwn[0];
68
69 mutex_lock(&g_device_mutex);
70 list_for_each_entry(se_dev, &g_device_list, g_dev_node) {
71
acb3f260
NB		 72 if (!se_dev->dev_attrib.emulate_3pc)
73 continue;
74
cbf031f4
NB		 75 memset(&tmp_dev_wwn[0], 0, XCOPY_NAA_IEEE_REGEX_LEN);
76 target_xcopy_gen_naa_ieee(se_dev, &tmp_dev_wwn[0]);
77
78 rc = memcmp(&tmp_dev_wwn[0], dev_wwn, XCOPY_NAA_IEEE_REGEX_LEN);
79 if (rc != 0)
80 continue;
81
0bcc297e 82 if (src) {
cbf031f4
NB		 83 xop->dst_dev = se_dev;
84 pr_debug("XCOPY 0xe4: Setting xop->dst_dev: %p from located"
85 " se_dev\n", xop->dst_dev);
86 } else {
87 xop->src_dev = se_dev;
88 pr_debug("XCOPY 0xe4: Setting xop->src_dev: %p from located"
89 " se_dev\n", xop->src_dev);
90 }
91
d588cf8f 92 rc = target_depend_item(&se_dev->dev_group.cg_item);
cbf031f4
NB		 93 if (rc != 0) {
94 pr_err("configfs_depend_item attempt failed:"
95 " %d for se_dev: %p\n", rc, se_dev);
96 mutex_unlock(&g_device_mutex);
97 return rc;
98 }
99
d588cf8f
CH		 100 pr_debug("Called configfs_depend_item for se_dev: %p"
101 " se_dev->se_dev_group: %p\n", se_dev,
cbf031f4
NB		 102 &se_dev->dev_group);
103
104 mutex_unlock(&g_device_mutex);
105 return 0;
106 }
107 mutex_unlock(&g_device_mutex);
108
109 pr_err("Unable to locate 0xe4 descriptor for EXTENDED_COPY\n");
110 return -EINVAL;
111}
112
113static int target_xcopy_parse_tiddesc_e4(struct se_cmd *se_cmd, struct xcopy_op *xop,
114 unsigned char *p, bool src)
115{
116 unsigned char *desc = p;
117 unsigned short ript;
118 u8 desig_len;
119 /*
120 * Extract RELATIVE INITIATOR PORT IDENTIFIER
121 */
122 ript = get_unaligned_be16(&desc[2]);
123 pr_debug("XCOPY 0xe4: RELATIVE INITIATOR PORT IDENTIFIER: %hu\n", ript);
124 /*
125 * Check for supported code set, association, and designator type
126 */
127 if ((desc[4] & 0x0f) != 0x1) {
128 pr_err("XCOPY 0xe4: code set of non binary type not supported\n");
129 return -EINVAL;
130 }
131 if ((desc[5] & 0x30) != 0x00) {
132 pr_err("XCOPY 0xe4: association other than LUN not supported\n");
133 return -EINVAL;
134 }
135 if ((desc[5] & 0x0f) != 0x3) {
136 pr_err("XCOPY 0xe4: designator type unsupported: 0x%02x\n",
137 (desc[5] & 0x0f));
138 return -EINVAL;
139 }
140 /*
141 * Check for matching 16 byte length for NAA IEEE Registered Extended
142 * Assigned designator
143 */
144 desig_len = desc[7];
145 if (desig_len != 16) {
146 pr_err("XCOPY 0xe4: invalid desig_len: %d\n", (int)desig_len);
147 return -EINVAL;
148 }
149 pr_debug("XCOPY 0xe4: desig_len: %d\n", (int)desig_len);
150 /*
151 * Check for NAA IEEE Registered Extended Assigned header..
152 */
153 if ((desc[8] & 0xf0) != 0x60) {
154 pr_err("XCOPY 0xe4: Unsupported DESIGNATOR TYPE: 0x%02x\n",
155 (desc[8] & 0xf0));
156 return -EINVAL;
157 }
158
0bcc297e 159 if (src) {
cbf031f4
NB		 160 memcpy(&xop->src_tid_wwn[0], &desc[8], XCOPY_NAA_IEEE_REGEX_LEN);
161 /*
162 * Determine if the source designator matches the local device
163 */
164 if (!memcmp(&xop->local_dev_wwn[0], &xop->src_tid_wwn[0],
165 XCOPY_NAA_IEEE_REGEX_LEN)) {
166 xop->op_origin = XCOL_SOURCE_RECV_OP;
167 xop->src_dev = se_cmd->se_dev;
168 pr_debug("XCOPY 0xe4: Set xop->src_dev %p from source"
169 " received xop\n", xop->src_dev);
170 }
171 } else {
172 memcpy(&xop->dst_tid_wwn[0], &desc[8], XCOPY_NAA_IEEE_REGEX_LEN);
173 /*
174 * Determine if the destination designator matches the local device
175 */
176 if (!memcmp(&xop->local_dev_wwn[0], &xop->dst_tid_wwn[0],
177 XCOPY_NAA_IEEE_REGEX_LEN)) {
178 xop->op_origin = XCOL_DEST_RECV_OP;
179 xop->dst_dev = se_cmd->se_dev;
180 pr_debug("XCOPY 0xe4: Set xop->dst_dev: %p from destination"
181 " received xop\n", xop->dst_dev);
182 }
183 }
184
185 return 0;
186}
187
188static int target_xcopy_parse_target_descriptors(struct se_cmd *se_cmd,
189 struct xcopy_op *xop, unsigned char *p,
190 unsigned short tdll)
191{
192 struct se_device *local_dev = se_cmd->se_dev;
193 unsigned char *desc = p;
194 int offset = tdll % XCOPY_TARGET_DESC_LEN, rc, ret = 0;
195 unsigned short start = 0;
196 bool src = true;
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 */
0bcc297e 229 if (src)
cbf031f4
NB		 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 (rc < 0)
250 goto out;
251
252 pr_debug("XCOPY TGT desc: Source dev: %p NAA IEEE WWN: 0x%16phN\n",
253 xop->src_dev, &xop->src_tid_wwn[0]);
254 pr_debug("XCOPY TGT desc: Dest dev: %p NAA IEEE WWN: 0x%16phN\n",
255 xop->dst_dev, &xop->dst_tid_wwn[0]);
256
257 return ret;
258
259out:
260 return -EINVAL;
261}
262
263static int target_xcopy_parse_segdesc_02(struct se_cmd *se_cmd, struct xcopy_op *xop,
264 unsigned char *p)
265{
266 unsigned char *desc = p;
267 int dc = (desc[1] & 0x02);
268 unsigned short desc_len;
269
270 desc_len = get_unaligned_be16(&desc[2]);
271 if (desc_len != 0x18) {
272 pr_err("XCOPY segment desc 0x02: Illegal desc_len:"
273 " %hu\n", desc_len);
274 return -EINVAL;
275 }
276
277 xop->stdi = get_unaligned_be16(&desc[4]);
278 xop->dtdi = get_unaligned_be16(&desc[6]);
279 pr_debug("XCOPY seg desc 0x02: desc_len: %hu stdi: %hu dtdi: %hu, DC: %d\n",
280 desc_len, xop->stdi, xop->dtdi, dc);
281
282 xop->nolb = get_unaligned_be16(&desc[10]);
283 xop->src_lba = get_unaligned_be64(&desc[12]);
284 xop->dst_lba = get_unaligned_be64(&desc[20]);
285 pr_debug("XCOPY seg desc 0x02: nolb: %hu src_lba: %llu dst_lba: %llu\n",
286 xop->nolb, (unsigned long long)xop->src_lba,
287 (unsigned long long)xop->dst_lba);
288
289 if (dc != 0) {
3e9e01de
NB		 290 xop->dbl = (desc[29] & 0xff) << 16;
291 xop->dbl |= (desc[30] & 0xff) << 8;
cbf031f4
NB		 292 xop->dbl |= desc[31] & 0xff;
293
294 pr_debug("XCOPY seg desc 0x02: DC=1 w/ dbl: %u\n", xop->dbl);
295 }
296 return 0;
297}
298
299static int target_xcopy_parse_segment_descriptors(struct se_cmd *se_cmd,
300 struct xcopy_op *xop, unsigned char *p,
301 unsigned int sdll)
302{
303 unsigned char *desc = p;
304 unsigned int start = 0;
305 int offset = sdll % XCOPY_SEGMENT_DESC_LEN, rc, ret = 0;
306
307 if (offset != 0) {
308 pr_err("XCOPY segment descriptor list length is not"
309 " multiple of %d\n", XCOPY_SEGMENT_DESC_LEN);
310 return -EINVAL;
311 }
312
313 while (start < sdll) {
314 /*
315 * Check segment descriptor type code for block -> block
316 */
317 switch (desc[0]) {
318 case 0x02:
319 rc = target_xcopy_parse_segdesc_02(se_cmd, xop, desc);
320 if (rc < 0)
321 goto out;
322
323 ret++;
324 start += XCOPY_SEGMENT_DESC_LEN;
325 desc += XCOPY_SEGMENT_DESC_LEN;
326 break;
327 default:
6774def6 328 pr_err("XCOPY unsupported segment descriptor"
cbf031f4
NB		 329 "type: 0x%02x\n", desc[0]);
330 goto out;
331 }
332 }
333
334 return ret;
335
336out:
337 return -EINVAL;
338}
339
340/*
341 * Start xcopy_pt ops
342 */
343
344struct xcopy_pt_cmd {
345 bool remote_port;
346 struct se_cmd se_cmd;
347 struct xcopy_op *xcopy_op;
348 struct completion xpt_passthrough_sem;
366bda19 349 unsigned char sense_buffer[TRANSPORT_SENSE_BUFFER];
cbf031f4
NB		 350};
351
352static struct se_port xcopy_pt_port;
353static struct se_portal_group xcopy_pt_tpg;
354static struct se_session xcopy_pt_sess;
355static struct se_node_acl xcopy_pt_nacl;
356
357static char *xcopy_pt_get_fabric_name(void)
358{
359 return "xcopy-pt";
360}
361
362static u32 xcopy_pt_get_tag(struct se_cmd *se_cmd)
363{
364 return 0;
365}
366
367static int xcopy_pt_get_cmd_state(struct se_cmd *se_cmd)
368{
369 return 0;
370}
371
372static void xcopy_pt_undepend_remotedev(struct xcopy_op *xop)
373{
cbf031f4
NB		 374 struct se_device *remote_dev;
375
376 if (xop->op_origin == XCOL_SOURCE_RECV_OP)
377 remote_dev = xop->dst_dev;
378 else
379 remote_dev = xop->src_dev;
380
d588cf8f 381 pr_debug("Calling configfs_undepend_item for"
cbf031f4 382 " remote_dev: %p remote_dev->dev_group: %p\n",
d588cf8f 383 remote_dev, &remote_dev->dev_group.cg_item);
cbf031f4 384
d588cf8f 385 target_undepend_item(&remote_dev->dev_group.cg_item);
cbf031f4
NB		 386}
387
388static void xcopy_pt_release_cmd(struct se_cmd *se_cmd)
389{
390 struct xcopy_pt_cmd *xpt_cmd = container_of(se_cmd,
391 struct xcopy_pt_cmd, se_cmd);
392
cbf031f4
NB		 393 kfree(xpt_cmd);
394}
395
396static int xcopy_pt_check_stop_free(struct se_cmd *se_cmd)
397{
398 struct xcopy_pt_cmd *xpt_cmd = container_of(se_cmd,
399 struct xcopy_pt_cmd, se_cmd);
400
401 complete(&xpt_cmd->xpt_passthrough_sem);
402 return 0;
403}
404
405static int xcopy_pt_write_pending(struct se_cmd *se_cmd)
406{
407 return 0;
408}
409
410static int xcopy_pt_write_pending_status(struct se_cmd *se_cmd)
411{
412 return 0;
413}
414
415static int xcopy_pt_queue_data_in(struct se_cmd *se_cmd)
416{
417 return 0;
418}
419
420static int xcopy_pt_queue_status(struct se_cmd *se_cmd)
421{
422 return 0;
423}
424
9ac8928e 425static const struct target_core_fabric_ops xcopy_pt_tfo = {
cbf031f4
NB		 426 .get_fabric_name = xcopy_pt_get_fabric_name,
427 .get_task_tag = xcopy_pt_get_tag,
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
441int 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_port, 0, sizeof(struct se_port));
450 INIT_LIST_HEAD(&xcopy_pt_port.sep_alua_list);
451 INIT_LIST_HEAD(&xcopy_pt_port.sep_list);
452 mutex_init(&xcopy_pt_port.sep_tg_pt_md_mutex);
453
454 memset(&xcopy_pt_tpg, 0, sizeof(struct se_portal_group));
455 INIT_LIST_HEAD(&xcopy_pt_tpg.se_tpg_node);
456 INIT_LIST_HEAD(&xcopy_pt_tpg.acl_node_list);
457 INIT_LIST_HEAD(&xcopy_pt_tpg.tpg_sess_list);
458
459 xcopy_pt_port.sep_tpg = &xcopy_pt_tpg;
460 xcopy_pt_tpg.se_tpg_tfo = &xcopy_pt_tfo;
461
462 memset(&xcopy_pt_nacl, 0, sizeof(struct se_node_acl));
463 INIT_LIST_HEAD(&xcopy_pt_nacl.acl_list);
464 INIT_LIST_HEAD(&xcopy_pt_nacl.acl_sess_list);
465 memset(&xcopy_pt_sess, 0, sizeof(struct se_session));
466 INIT_LIST_HEAD(&xcopy_pt_sess.sess_list);
467 INIT_LIST_HEAD(&xcopy_pt_sess.sess_acl_list);
468
469 xcopy_pt_nacl.se_tpg = &xcopy_pt_tpg;
470 xcopy_pt_nacl.nacl_sess = &xcopy_pt_sess;
471
472 xcopy_pt_sess.se_tpg = &xcopy_pt_tpg;
473 xcopy_pt_sess.se_node_acl = &xcopy_pt_nacl;
474
475 return 0;
476}
477
478void target_xcopy_release_pt(void)
479{
480 if (xcopy_wq)
481 destroy_workqueue(xcopy_wq);
482}
483
484static void target_xcopy_setup_pt_port(
485 struct xcopy_pt_cmd *xpt_cmd,
486 struct xcopy_op *xop,
487 bool remote_port)
488{
489 struct se_cmd *ec_cmd = xop->xop_se_cmd;
490 struct se_cmd *pt_cmd = &xpt_cmd->se_cmd;
491
492 if (xop->op_origin == XCOL_SOURCE_RECV_OP) {
493 /*
494 * Honor destination port reservations for X-COPY PUSH emulation
495 * when CDB is received on local source port, and READs blocks to
496 * WRITE on remote destination port.
497 */
498 if (remote_port) {
499 xpt_cmd->remote_port = remote_port;
500 pt_cmd->se_lun->lun_sep = &xcopy_pt_port;
501 pr_debug("Setup emulated remote DEST xcopy_pt_port: %p to"
502 " cmd->se_lun->lun_sep for X-COPY data PUSH\n",
503 pt_cmd->se_lun->lun_sep);
504 } else {
505 pt_cmd->se_lun = ec_cmd->se_lun;
506 pt_cmd->se_dev = ec_cmd->se_dev;
507
508 pr_debug("Honoring local SRC port from ec_cmd->se_dev:"
509 " %p\n", pt_cmd->se_dev);
510 pt_cmd->se_lun = ec_cmd->se_lun;
511 pr_debug("Honoring local SRC port from ec_cmd->se_lun: %p\n",
512 pt_cmd->se_lun);
513 }
514 } else {
515 /*
516 * Honor source port reservation for X-COPY PULL emulation
517 * when CDB is received on local desintation port, and READs
518 * blocks from the remote source port to WRITE on local
519 * destination port.
520 */
521 if (remote_port) {
522 xpt_cmd->remote_port = remote_port;
523 pt_cmd->se_lun->lun_sep = &xcopy_pt_port;
524 pr_debug("Setup emulated remote SRC xcopy_pt_port: %p to"
525 " cmd->se_lun->lun_sep for X-COPY data PULL\n",
526 pt_cmd->se_lun->lun_sep);
527 } else {
528 pt_cmd->se_lun = ec_cmd->se_lun;
529 pt_cmd->se_dev = ec_cmd->se_dev;
530
531 pr_debug("Honoring local DST port from ec_cmd->se_dev:"
532 " %p\n", pt_cmd->se_dev);
533 pt_cmd->se_lun = ec_cmd->se_lun;
534 pr_debug("Honoring local DST port from ec_cmd->se_lun: %p\n",
535 pt_cmd->se_lun);
536 }
537 }
538}
539
2c336e3a
CH		 540static void target_xcopy_init_pt_lun(struct se_device *se_dev,
541 struct se_cmd *pt_cmd, bool remote_port)
cbf031f4
NB		 542{
543 /*
544 * Don't allocate + init an pt_cmd->se_lun if honoring local port for
545 * reservations. The pt_cmd->se_lun pointer will be setup from within
546 * target_xcopy_setup_pt_port()
547 */
2c336e3a
CH		 548 if (remote_port) {
549 pr_debug("Setup emulated se_dev: %p from se_dev\n",
550 pt_cmd->se_dev);
551 pt_cmd->se_lun = &se_dev->xcopy_lun;
552 pt_cmd->se_dev = se_dev;
cbf031f4
NB		 553 }
554
c3d0a7c2 555 pt_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
cbf031f4
NB		 556}
557
558static int target_xcopy_setup_pt_cmd(
559 struct xcopy_pt_cmd *xpt_cmd,
560 struct xcopy_op *xop,
561 struct se_device *se_dev,
562 unsigned char *cdb,
563 bool remote_port,
564 bool alloc_mem)
565{
566 struct se_cmd *cmd = &xpt_cmd->se_cmd;
567 sense_reason_t sense_rc;
568 int ret = 0, rc;
569 /*
570 * Setup LUN+port to honor reservations based upon xop->op_origin for
571 * X-COPY PUSH or X-COPY PULL based upon where the CDB was received.
572 */
2c336e3a
CH		 573 target_xcopy_init_pt_lun(se_dev, cmd, remote_port);
574
cbf031f4
NB		 575 xpt_cmd->xcopy_op = xop;
576 target_xcopy_setup_pt_port(xpt_cmd, xop, remote_port);
577
578 sense_rc = target_setup_cmd_from_cdb(cmd, cdb);
579 if (sense_rc) {
580 ret = -EINVAL;
581 goto out;
582 }
583
584 if (alloc_mem) {
585 rc = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents,
586 cmd->data_length, false);
587 if (rc < 0) {
588 ret = rc;
589 goto out;
590 }
591 /*
592 * Set this bit so that transport_free_pages() allows the
593 * caller to release SGLs + physical memory allocated by
594 * transport_generic_get_mem()..
595 */
596 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
597 } else {
598 /*
599 * Here the previously allocated SGLs for the internal READ
600 * are mapped zero-copy to the internal WRITE.
601 */
602 sense_rc = transport_generic_map_mem_to_cmd(cmd,
603 xop->xop_data_sg, xop->xop_data_nents,
604 NULL, 0);
605 if (sense_rc) {
606 ret = -EINVAL;
607 goto out;
608 }
609
610 pr_debug("Setup PASSTHROUGH_NOALLOC t_data_sg: %p t_data_nents:"
611 " %u\n", cmd->t_data_sg, cmd->t_data_nents);
612 }
613
614 return 0;
615
616out:
cbf031f4
NB		 617 return ret;
618}
619
620static int target_xcopy_issue_pt_cmd(struct xcopy_pt_cmd *xpt_cmd)
621{
622 struct se_cmd *se_cmd = &xpt_cmd->se_cmd;
623 sense_reason_t sense_rc;
624
625 sense_rc = transport_generic_new_cmd(se_cmd);
626 if (sense_rc)
627 return -EINVAL;
628
629 if (se_cmd->data_direction == DMA_TO_DEVICE)
630 target_execute_cmd(se_cmd);
631
632 wait_for_completion_interruptible(&xpt_cmd->xpt_passthrough_sem);
633
634 pr_debug("target_xcopy_issue_pt_cmd(): SCSI status: 0x%02x\n",
635 se_cmd->scsi_status);
8a955d6d
NB		 636
637 return (se_cmd->scsi_status) ? -EINVAL : 0;
cbf031f4
NB		 638}
639
640static int target_xcopy_read_source(
641 struct se_cmd *ec_cmd,
642 struct xcopy_op *xop,
643 struct se_device *src_dev,
644 sector_t src_lba,
645 u32 src_sectors)
646{
647 struct xcopy_pt_cmd *xpt_cmd;
648 struct se_cmd *se_cmd;
649 u32 length = (src_sectors * src_dev->dev_attrib.block_size);
650 int rc;
651 unsigned char cdb[16];
652 bool remote_port = (xop->op_origin == XCOL_DEST_RECV_OP);
653
654 xpt_cmd = kzalloc(sizeof(struct xcopy_pt_cmd), GFP_KERNEL);
655 if (!xpt_cmd) {
656 pr_err("Unable to allocate xcopy_pt_cmd\n");
657 return -ENOMEM;
658 }
659 init_completion(&xpt_cmd->xpt_passthrough_sem);
660 se_cmd = &xpt_cmd->se_cmd;
661
662 memset(&cdb[0], 0, 16);
663 cdb[0] = READ_16;
664 put_unaligned_be64(src_lba, &cdb[2]);
665 put_unaligned_be32(src_sectors, &cdb[10]);
666 pr_debug("XCOPY: Built READ_16: LBA: %llu Sectors: %u Length: %u\n",
667 (unsigned long long)src_lba, src_sectors, length);
668
669 transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, NULL, length,
366bda19 670 DMA_FROM_DEVICE, 0, &xpt_cmd->sense_buffer[0]);
cbf031f4
NB		 671 xop->src_pt_cmd = xpt_cmd;
672
673 rc = target_xcopy_setup_pt_cmd(xpt_cmd, xop, src_dev, &cdb[0],
674 remote_port, true);
675 if (rc < 0) {
676 transport_generic_free_cmd(se_cmd, 0);
677 return rc;
678 }
679
680 xop->xop_data_sg = se_cmd->t_data_sg;
681 xop->xop_data_nents = se_cmd->t_data_nents;
682 pr_debug("XCOPY-READ: Saved xop->xop_data_sg: %p, num: %u for READ"
683 " memory\n", xop->xop_data_sg, xop->xop_data_nents);
684
685 rc = target_xcopy_issue_pt_cmd(xpt_cmd);
686 if (rc < 0) {
687 transport_generic_free_cmd(se_cmd, 0);
688 return rc;
689 }
690 /*
691 * Clear off the allocated t_data_sg, that has been saved for
692 * zero-copy WRITE submission reuse in struct xcopy_op..
693 */
694 se_cmd->t_data_sg = NULL;
695 se_cmd->t_data_nents = 0;
696
697 return 0;
698}
699
700static int target_xcopy_write_destination(
701 struct se_cmd *ec_cmd,
702 struct xcopy_op *xop,
703 struct se_device *dst_dev,
704 sector_t dst_lba,
705 u32 dst_sectors)
706{
707 struct xcopy_pt_cmd *xpt_cmd;
708 struct se_cmd *se_cmd;
709 u32 length = (dst_sectors * dst_dev->dev_attrib.block_size);
710 int rc;
711 unsigned char cdb[16];
712 bool remote_port = (xop->op_origin == XCOL_SOURCE_RECV_OP);
713
714 xpt_cmd = kzalloc(sizeof(struct xcopy_pt_cmd), GFP_KERNEL);
715 if (!xpt_cmd) {
716 pr_err("Unable to allocate xcopy_pt_cmd\n");
717 return -ENOMEM;
718 }
719 init_completion(&xpt_cmd->xpt_passthrough_sem);
720 se_cmd = &xpt_cmd->se_cmd;
721
722 memset(&cdb[0], 0, 16);
723 cdb[0] = WRITE_16;
724 put_unaligned_be64(dst_lba, &cdb[2]);
725 put_unaligned_be32(dst_sectors, &cdb[10]);
726 pr_debug("XCOPY: Built WRITE_16: LBA: %llu Sectors: %u Length: %u\n",
727 (unsigned long long)dst_lba, dst_sectors, length);
728
729 transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, NULL, length,
366bda19 730 DMA_TO_DEVICE, 0, &xpt_cmd->sense_buffer[0]);
cbf031f4
NB		 731 xop->dst_pt_cmd = xpt_cmd;
732
733 rc = target_xcopy_setup_pt_cmd(xpt_cmd, xop, dst_dev, &cdb[0],
734 remote_port, false);
735 if (rc < 0) {
736 struct se_cmd *src_cmd = &xop->src_pt_cmd->se_cmd;
737 /*
738 * If the failure happened before the t_mem_list hand-off in
739 * target_xcopy_setup_pt_cmd(), Reset memory + clear flag so that
740 * core releases this memory on error during X-COPY WRITE I/O.
741 */
742 src_cmd->se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
743 src_cmd->t_data_sg = xop->xop_data_sg;
744 src_cmd->t_data_nents = xop->xop_data_nents;
745
746 transport_generic_free_cmd(se_cmd, 0);
747 return rc;
748 }
749
750 rc = target_xcopy_issue_pt_cmd(xpt_cmd);
751 if (rc < 0) {
752 se_cmd->se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
753 transport_generic_free_cmd(se_cmd, 0);
754 return rc;
755 }
756
757 return 0;
758}
759
760static void target_xcopy_do_work(struct work_struct *work)
761{
762 struct xcopy_op *xop = container_of(work, struct xcopy_op, xop_work);
763 struct se_device *src_dev = xop->src_dev, *dst_dev = xop->dst_dev;
764 struct se_cmd *ec_cmd = xop->xop_se_cmd;
765 sector_t src_lba = xop->src_lba, dst_lba = xop->dst_lba, end_lba;
766 unsigned int max_sectors;
767 int rc;
768 unsigned short nolb = xop->nolb, cur_nolb, max_nolb, copied_nolb = 0;
769
770 end_lba = src_lba + nolb;
771 /*
772 * Break up XCOPY I/O into hw_max_sectors sized I/O based on the
773 * smallest max_sectors between src_dev + dev_dev, or
774 */
775 max_sectors = min(src_dev->dev_attrib.hw_max_sectors,
776 dst_dev->dev_attrib.hw_max_sectors);
777 max_sectors = min_t(u32, max_sectors, XCOPY_MAX_SECTORS);
778
779 max_nolb = min_t(u16, max_sectors, ((u16)(~0U)));
780
781 pr_debug("target_xcopy_do_work: nolb: %hu, max_nolb: %hu end_lba: %llu\n",
782 nolb, max_nolb, (unsigned long long)end_lba);
783 pr_debug("target_xcopy_do_work: Starting src_lba: %llu, dst_lba: %llu\n",
784 (unsigned long long)src_lba, (unsigned long long)dst_lba);
785
786 while (src_lba < end_lba) {
787 cur_nolb = min(nolb, max_nolb);
788
789 pr_debug("target_xcopy_do_work: Calling read src_dev: %p src_lba: %llu,"
790 " cur_nolb: %hu\n", src_dev, (unsigned long long)src_lba, cur_nolb);
791
792 rc = target_xcopy_read_source(ec_cmd, xop, src_dev, src_lba, cur_nolb);
793 if (rc < 0)
794 goto out;
795
796 src_lba += cur_nolb;
797 pr_debug("target_xcopy_do_work: Incremented READ src_lba to %llu\n",
798 (unsigned long long)src_lba);
799
800 pr_debug("target_xcopy_do_work: Calling write dst_dev: %p dst_lba: %llu,"
801 " cur_nolb: %hu\n", dst_dev, (unsigned long long)dst_lba, cur_nolb);
802
803 rc = target_xcopy_write_destination(ec_cmd, xop, dst_dev,
804 dst_lba, cur_nolb);
805 if (rc < 0) {
806 transport_generic_free_cmd(&xop->src_pt_cmd->se_cmd, 0);
807 goto out;
808 }
809
810 dst_lba += cur_nolb;
811 pr_debug("target_xcopy_do_work: Incremented WRITE dst_lba to %llu\n",
812 (unsigned long long)dst_lba);
813
814 copied_nolb += cur_nolb;
815 nolb -= cur_nolb;
816
817 transport_generic_free_cmd(&xop->src_pt_cmd->se_cmd, 0);
818 xop->dst_pt_cmd->se_cmd.se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
819
820 transport_generic_free_cmd(&xop->dst_pt_cmd->se_cmd, 0);
821 }
822
823 xcopy_pt_undepend_remotedev(xop);
824 kfree(xop);
825
826 pr_debug("target_xcopy_do_work: Final src_lba: %llu, dst_lba: %llu\n",
827 (unsigned long long)src_lba, (unsigned long long)dst_lba);
828 pr_debug("target_xcopy_do_work: Blocks copied: %hu, Bytes Copied: %u\n",
829 copied_nolb, copied_nolb * dst_dev->dev_attrib.block_size);
830
831 pr_debug("target_xcopy_do_work: Setting X-COPY GOOD status -> sending response\n");
832 target_complete_cmd(ec_cmd, SAM_STAT_GOOD);
833 return;
834
835out:
836 xcopy_pt_undepend_remotedev(xop);
837 kfree(xop);
838
839 pr_warn("target_xcopy_do_work: Setting X-COPY CHECK_CONDITION -> sending response\n");
840 ec_cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
841 target_complete_cmd(ec_cmd, SAM_STAT_CHECK_CONDITION);
842}
843
844sense_reason_t target_do_xcopy(struct se_cmd *se_cmd)
845{
acb3f260 846 struct se_device *dev = se_cmd->se_dev;
cbf031f4
NB		 847 struct xcopy_op *xop = NULL;
848 unsigned char *p = NULL, *seg_desc;
849 unsigned int list_id, list_id_usage, sdll, inline_dl, sa;
48502ddb 850 sense_reason_t ret = TCM_INVALID_PARAMETER_LIST;
cbf031f4
NB		 851 int rc;
852 unsigned short tdll;
853
acb3f260
NB		 854 if (!dev->dev_attrib.emulate_3pc) {
855 pr_err("EXTENDED_COPY operation explicitly disabled\n");
856 return TCM_UNSUPPORTED_SCSI_OPCODE;
857 }
858
cbf031f4
NB		 859 sa = se_cmd->t_task_cdb[1] & 0x1f;
860 if (sa != 0x00) {
861 pr_err("EXTENDED_COPY(LID4) not supported\n");
862 return TCM_UNSUPPORTED_SCSI_OPCODE;
863 }
864
934a138e
NB		 865 xop = kzalloc(sizeof(struct xcopy_op), GFP_KERNEL);
866 if (!xop) {
867 pr_err("Unable to allocate xcopy_op\n");
868 return TCM_OUT_OF_RESOURCES;
869 }
870 xop->xop_se_cmd = se_cmd;
871
cbf031f4
NB		 872 p = transport_kmap_data_sg(se_cmd);
873 if (!p) {
874 pr_err("transport_kmap_data_sg() failed in target_do_xcopy\n");
934a138e 875 kfree(xop);
cbf031f4
NB		 876 return TCM_OUT_OF_RESOURCES;
877 }
878
879 list_id = p[0];
3f7a46c6
NB		 880 list_id_usage = (p[1] & 0x18) >> 3;
881
cbf031f4
NB		 882 /*
883 * Determine TARGET DESCRIPTOR LIST LENGTH + SEGMENT DESCRIPTOR LIST LENGTH
884 */
885 tdll = get_unaligned_be16(&p[2]);
886 sdll = get_unaligned_be32(&p[8]);
887
888 inline_dl = get_unaligned_be32(&p[12]);
889 if (inline_dl != 0) {
890 pr_err("XCOPY with non zero inline data length\n");
891 goto out;
892 }
893
cbf031f4
NB		 894 pr_debug("Processing XCOPY with list_id: 0x%02x list_id_usage: 0x%02x"
895 " tdll: %hu sdll: %u inline_dl: %u\n", list_id, list_id_usage,
896 tdll, sdll, inline_dl);
897
898 rc = target_xcopy_parse_target_descriptors(se_cmd, xop, &p[16], tdll);
899 if (rc <= 0)
900 goto out;
901
48502ddb
NB		 902 if (xop->src_dev->dev_attrib.block_size !=
903 xop->dst_dev->dev_attrib.block_size) {
904 pr_err("XCOPY: Non matching src_dev block_size: %u + dst_dev"
905 " block_size: %u currently unsupported\n",
906 xop->src_dev->dev_attrib.block_size,
907 xop->dst_dev->dev_attrib.block_size);
908 xcopy_pt_undepend_remotedev(xop);
909 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
910 goto out;
911 }
912
cbf031f4
NB		 913 pr_debug("XCOPY: Processed %d target descriptors, length: %u\n", rc,
914 rc * XCOPY_TARGET_DESC_LEN);
915 seg_desc = &p[16];
916 seg_desc += (rc * XCOPY_TARGET_DESC_LEN);
917
918 rc = target_xcopy_parse_segment_descriptors(se_cmd, xop, seg_desc, sdll);
919 if (rc <= 0) {
920 xcopy_pt_undepend_remotedev(xop);
921 goto out;
922 }
923 transport_kunmap_data_sg(se_cmd);
924
925 pr_debug("XCOPY: Processed %d segment descriptors, length: %u\n", rc,
926 rc * XCOPY_SEGMENT_DESC_LEN);
927 INIT_WORK(&xop->xop_work, target_xcopy_do_work);
928 queue_work(xcopy_wq, &xop->xop_work);
929 return TCM_NO_SENSE;
930
931out:
932 if (p)
933 transport_kunmap_data_sg(se_cmd);
934 kfree(xop);
48502ddb 935 return ret;
cbf031f4
NB		 936}
937
938static sense_reason_t target_rcr_operating_parameters(struct se_cmd *se_cmd)
939{
940 unsigned char *p;
941
942 p = transport_kmap_data_sg(se_cmd);
943 if (!p) {
944 pr_err("transport_kmap_data_sg failed in"
945 " target_rcr_operating_parameters\n");
946 return TCM_OUT_OF_RESOURCES;
947 }
948
949 if (se_cmd->data_length < 54) {
950 pr_err("Receive Copy Results Op Parameters length"
951 " too small: %u\n", se_cmd->data_length);
952 transport_kunmap_data_sg(se_cmd);
953 return TCM_INVALID_CDB_FIELD;
954 }
955 /*
956 * Set SNLID=1 (Supports no List ID)
957 */
958 p[4] = 0x1;
959 /*
960 * MAXIMUM TARGET DESCRIPTOR COUNT
961 */
962 put_unaligned_be16(RCR_OP_MAX_TARGET_DESC_COUNT, &p[8]);
963 /*
964 * MAXIMUM SEGMENT DESCRIPTOR COUNT
965 */
966 put_unaligned_be16(RCR_OP_MAX_SG_DESC_COUNT, &p[10]);
967 /*
968 * MAXIMUM DESCRIPTOR LIST LENGTH
969 */
970 put_unaligned_be32(RCR_OP_MAX_DESC_LIST_LEN, &p[12]);
971 /*
972 * MAXIMUM SEGMENT LENGTH
973 */
974 put_unaligned_be32(RCR_OP_MAX_SEGMENT_LEN, &p[16]);
975 /*
976 * MAXIMUM INLINE DATA LENGTH for SA 0x04 (NOT SUPPORTED)
977 */
978 put_unaligned_be32(0x0, &p[20]);
979 /*
980 * HELD DATA LIMIT
981 */
982 put_unaligned_be32(0x0, &p[24]);
983 /*
984 * MAXIMUM STREAM DEVICE TRANSFER SIZE
985 */
986 put_unaligned_be32(0x0, &p[28]);
987 /*
988 * TOTAL CONCURRENT COPIES
989 */
990 put_unaligned_be16(RCR_OP_TOTAL_CONCURR_COPIES, &p[34]);
991 /*
992 * MAXIMUM CONCURRENT COPIES
993 */
994 p[36] = RCR_OP_MAX_CONCURR_COPIES;
995 /*
996 * DATA SEGMENT GRANULARITY (log 2)
997 */
998 p[37] = RCR_OP_DATA_SEG_GRAN_LOG2;
999 /*
1000 * INLINE DATA GRANULARITY log 2)
1001 */
1002 p[38] = RCR_OP_INLINE_DATA_GRAN_LOG2;
1003 /*
1004 * HELD DATA GRANULARITY
1005 */
1006 p[39] = RCR_OP_HELD_DATA_GRAN_LOG2;
1007 /*
1008 * IMPLEMENTED DESCRIPTOR LIST LENGTH
1009 */
1010 p[43] = 0x2;
1011 /*
1012 * List of implemented descriptor type codes (ordered)
1013 */
1014 p[44] = 0x02; /* Copy Block to Block device */
1015 p[45] = 0xe4; /* Identification descriptor target descriptor */
1016
1017 /*
1018 * AVAILABLE DATA (n-3)
1019 */
1020 put_unaligned_be32(42, &p[0]);
1021
1022 transport_kunmap_data_sg(se_cmd);
1023 target_complete_cmd(se_cmd, GOOD);
1024
1025 return TCM_NO_SENSE;
1026}
1027
1028sense_reason_t target_do_receive_copy_results(struct se_cmd *se_cmd)
1029{
1030 unsigned char *cdb = &se_cmd->t_task_cdb[0];
1031 int sa = (cdb[1] & 0x1f), list_id = cdb[2];
1032 sense_reason_t rc = TCM_NO_SENSE;
1033
1034 pr_debug("Entering target_do_receive_copy_results: SA: 0x%02x, List ID:"
1035 " 0x%02x, AL: %u\n", sa, list_id, se_cmd->data_length);
1036
1037 if (list_id != 0) {
1038 pr_err("Receive Copy Results with non zero list identifier"
1039 " not supported\n");
1040 return TCM_INVALID_CDB_FIELD;
1041 }
1042
1043 switch (sa) {
1044 case RCR_SA_OPERATING_PARAMETERS:
1045 rc = target_rcr_operating_parameters(se_cmd);
1046 break;
1047 case RCR_SA_COPY_STATUS:
1048 case RCR_SA_RECEIVE_DATA:
1049 case RCR_SA_FAILED_SEGMENT_DETAILS:
1050 default:
1051 pr_err("Unsupported SA for receive copy results: 0x%02x\n", sa);
1052 return TCM_INVALID_CDB_FIELD;
1053 }
1054
1055 return rc;
1056}
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