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iser-target: check device before dereferencing its variable
[deliverable/linux.git] / drivers / target / target_core_xcopy.c
CommitLineData
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
37#include "target_core_pr.h"
38#include "target_core_ua.h"
39#include "target_core_xcopy.h"
40
41static struct workqueue_struct *xcopy_wq = NULL;
42/*
43 * From target_core_spc.c
44 */
45extern void spc_parse_naa_6h_vendor_specific(struct se_device *, unsigned char *);
46/*
47 * From target_core_device.c
48 */
49extern struct mutex g_device_mutex;
50extern struct list_head g_device_list;
51/*
52 * From target_core_configfs.c
53 */
54extern struct configfs_subsystem *target_core_subsystem[];
55
56static int target_xcopy_gen_naa_ieee(struct se_device *dev, unsigned char *buf)
57{
58 int off = 0;
59
60 buf[off++] = (0x6 << 4);
61 buf[off++] = 0x01;
62 buf[off++] = 0x40;
63 buf[off] = (0x5 << 4);
64
65 spc_parse_naa_6h_vendor_specific(dev, &buf[off]);
66 return 0;
67}
68
69static int target_xcopy_locate_se_dev_e4(struct se_cmd *se_cmd, struct xcopy_op *xop,
70 bool src)
71{
72 struct se_device *se_dev;
73 struct configfs_subsystem *subsys = target_core_subsystem[0];
74 unsigned char tmp_dev_wwn[XCOPY_NAA_IEEE_REGEX_LEN], *dev_wwn;
75 int rc;
76
77 if (src == true)
78 dev_wwn = &xop->dst_tid_wwn[0];
79 else
80 dev_wwn = &xop->src_tid_wwn[0];
81
82 mutex_lock(&g_device_mutex);
83 list_for_each_entry(se_dev, &g_device_list, g_dev_node) {
84
acb3f260
NB		 85 if (!se_dev->dev_attrib.emulate_3pc)
86 continue;
87
cbf031f4
NB		 88 memset(&tmp_dev_wwn[0], 0, XCOPY_NAA_IEEE_REGEX_LEN);
89 target_xcopy_gen_naa_ieee(se_dev, &tmp_dev_wwn[0]);
90
91 rc = memcmp(&tmp_dev_wwn[0], dev_wwn, XCOPY_NAA_IEEE_REGEX_LEN);
92 if (rc != 0)
93 continue;
94
95 if (src == true) {
96 xop->dst_dev = se_dev;
97 pr_debug("XCOPY 0xe4: Setting xop->dst_dev: %p from located"
98 " se_dev\n", xop->dst_dev);
99 } else {
100 xop->src_dev = se_dev;
101 pr_debug("XCOPY 0xe4: Setting xop->src_dev: %p from located"
102 " se_dev\n", xop->src_dev);
103 }
104
105 rc = configfs_depend_item(subsys,
106 &se_dev->dev_group.cg_item);
107 if (rc != 0) {
108 pr_err("configfs_depend_item attempt failed:"
109 " %d for se_dev: %p\n", rc, se_dev);
110 mutex_unlock(&g_device_mutex);
111 return rc;
112 }
113
114 pr_debug("Called configfs_depend_item for subsys: %p se_dev: %p"
115 " se_dev->se_dev_group: %p\n", subsys, se_dev,
116 &se_dev->dev_group);
117
118 mutex_unlock(&g_device_mutex);
119 return 0;
120 }
121 mutex_unlock(&g_device_mutex);
122
123 pr_err("Unable to locate 0xe4 descriptor for EXTENDED_COPY\n");
124 return -EINVAL;
125}
126
127static int target_xcopy_parse_tiddesc_e4(struct se_cmd *se_cmd, struct xcopy_op *xop,
128 unsigned char *p, bool src)
129{
130 unsigned char *desc = p;
131 unsigned short ript;
132 u8 desig_len;
133 /*
134 * Extract RELATIVE INITIATOR PORT IDENTIFIER
135 */
136 ript = get_unaligned_be16(&desc[2]);
137 pr_debug("XCOPY 0xe4: RELATIVE INITIATOR PORT IDENTIFIER: %hu\n", ript);
138 /*
139 * Check for supported code set, association, and designator type
140 */
141 if ((desc[4] & 0x0f) != 0x1) {
142 pr_err("XCOPY 0xe4: code set of non binary type not supported\n");
143 return -EINVAL;
144 }
145 if ((desc[5] & 0x30) != 0x00) {
146 pr_err("XCOPY 0xe4: association other than LUN not supported\n");
147 return -EINVAL;
148 }
149 if ((desc[5] & 0x0f) != 0x3) {
150 pr_err("XCOPY 0xe4: designator type unsupported: 0x%02x\n",
151 (desc[5] & 0x0f));
152 return -EINVAL;
153 }
154 /*
155 * Check for matching 16 byte length for NAA IEEE Registered Extended
156 * Assigned designator
157 */
158 desig_len = desc[7];
159 if (desig_len != 16) {
160 pr_err("XCOPY 0xe4: invalid desig_len: %d\n", (int)desig_len);
161 return -EINVAL;
162 }
163 pr_debug("XCOPY 0xe4: desig_len: %d\n", (int)desig_len);
164 /*
165 * Check for NAA IEEE Registered Extended Assigned header..
166 */
167 if ((desc[8] & 0xf0) != 0x60) {
168 pr_err("XCOPY 0xe4: Unsupported DESIGNATOR TYPE: 0x%02x\n",
169 (desc[8] & 0xf0));
170 return -EINVAL;
171 }
172
173 if (src == true) {
174 memcpy(&xop->src_tid_wwn[0], &desc[8], XCOPY_NAA_IEEE_REGEX_LEN);
175 /*
176 * Determine if the source designator matches the local device
177 */
178 if (!memcmp(&xop->local_dev_wwn[0], &xop->src_tid_wwn[0],
179 XCOPY_NAA_IEEE_REGEX_LEN)) {
180 xop->op_origin = XCOL_SOURCE_RECV_OP;
181 xop->src_dev = se_cmd->se_dev;
182 pr_debug("XCOPY 0xe4: Set xop->src_dev %p from source"
183 " received xop\n", xop->src_dev);
184 }
185 } else {
186 memcpy(&xop->dst_tid_wwn[0], &desc[8], XCOPY_NAA_IEEE_REGEX_LEN);
187 /*
188 * Determine if the destination designator matches the local device
189 */
190 if (!memcmp(&xop->local_dev_wwn[0], &xop->dst_tid_wwn[0],
191 XCOPY_NAA_IEEE_REGEX_LEN)) {
192 xop->op_origin = XCOL_DEST_RECV_OP;
193 xop->dst_dev = se_cmd->se_dev;
194 pr_debug("XCOPY 0xe4: Set xop->dst_dev: %p from destination"
195 " received xop\n", xop->dst_dev);
196 }
197 }
198
199 return 0;
200}
201
202static int target_xcopy_parse_target_descriptors(struct se_cmd *se_cmd,
203 struct xcopy_op *xop, unsigned char *p,
204 unsigned short tdll)
205{
206 struct se_device *local_dev = se_cmd->se_dev;
207 unsigned char *desc = p;
208 int offset = tdll % XCOPY_TARGET_DESC_LEN, rc, ret = 0;
209 unsigned short start = 0;
210 bool src = true;
211
212 if (offset != 0) {
213 pr_err("XCOPY target descriptor list length is not"
214 " multiple of %d\n", XCOPY_TARGET_DESC_LEN);
215 return -EINVAL;
216 }
217 if (tdll > 64) {
218 pr_err("XCOPY target descriptor supports a maximum"
219 " two src/dest descriptors, tdll: %hu too large..\n", tdll);
220 return -EINVAL;
221 }
222 /*
223 * Generate an IEEE Registered Extended designator based upon the
224 * se_device the XCOPY was received upon..
225 */
226 memset(&xop->local_dev_wwn[0], 0, XCOPY_NAA_IEEE_REGEX_LEN);
227 target_xcopy_gen_naa_ieee(local_dev, &xop->local_dev_wwn[0]);
228
229 while (start < tdll) {
230 /*
231 * Check target descriptor identification with 0xE4 type with
232 * use VPD 0x83 WWPN matching ..
233 */
234 switch (desc[0]) {
235 case 0xe4:
236 rc = target_xcopy_parse_tiddesc_e4(se_cmd, xop,
237 &desc[0], src);
238 if (rc != 0)
239 goto out;
240 /*
241 * Assume target descriptors are in source -> destination order..
242 */
243 if (src == true)
244 src = false;
245 else
246 src = true;
247 start += XCOPY_TARGET_DESC_LEN;
248 desc += XCOPY_TARGET_DESC_LEN;
249 ret++;
250 break;
251 default:
252 pr_err("XCOPY unsupported descriptor type code:"
253 " 0x%02x\n", desc[0]);
254 goto out;
255 }
256 }
257
258 if (xop->op_origin == XCOL_SOURCE_RECV_OP)
259 rc = target_xcopy_locate_se_dev_e4(se_cmd, xop, true);
260 else
261 rc = target_xcopy_locate_se_dev_e4(se_cmd, xop, false);
262
263 if (rc < 0)
264 goto out;
265
266 pr_debug("XCOPY TGT desc: Source dev: %p NAA IEEE WWN: 0x%16phN\n",
267 xop->src_dev, &xop->src_tid_wwn[0]);
268 pr_debug("XCOPY TGT desc: Dest dev: %p NAA IEEE WWN: 0x%16phN\n",
269 xop->dst_dev, &xop->dst_tid_wwn[0]);
270
271 return ret;
272
273out:
274 return -EINVAL;
275}
276
277static int target_xcopy_parse_segdesc_02(struct se_cmd *se_cmd, struct xcopy_op *xop,
278 unsigned char *p)
279{
280 unsigned char *desc = p;
281 int dc = (desc[1] & 0x02);
282 unsigned short desc_len;
283
284 desc_len = get_unaligned_be16(&desc[2]);
285 if (desc_len != 0x18) {
286 pr_err("XCOPY segment desc 0x02: Illegal desc_len:"
287 " %hu\n", desc_len);
288 return -EINVAL;
289 }
290
291 xop->stdi = get_unaligned_be16(&desc[4]);
292 xop->dtdi = get_unaligned_be16(&desc[6]);
293 pr_debug("XCOPY seg desc 0x02: desc_len: %hu stdi: %hu dtdi: %hu, DC: %d\n",
294 desc_len, xop->stdi, xop->dtdi, dc);
295
296 xop->nolb = get_unaligned_be16(&desc[10]);
297 xop->src_lba = get_unaligned_be64(&desc[12]);
298 xop->dst_lba = get_unaligned_be64(&desc[20]);
299 pr_debug("XCOPY seg desc 0x02: nolb: %hu src_lba: %llu dst_lba: %llu\n",
300 xop->nolb, (unsigned long long)xop->src_lba,
301 (unsigned long long)xop->dst_lba);
302
303 if (dc != 0) {
3e9e01de
NB		 304 xop->dbl = (desc[29] & 0xff) << 16;
305 xop->dbl |= (desc[30] & 0xff) << 8;
cbf031f4
NB		 306 xop->dbl |= desc[31] & 0xff;
307
308 pr_debug("XCOPY seg desc 0x02: DC=1 w/ dbl: %u\n", xop->dbl);
309 }
310 return 0;
311}
312
313static int target_xcopy_parse_segment_descriptors(struct se_cmd *se_cmd,
314 struct xcopy_op *xop, unsigned char *p,
315 unsigned int sdll)
316{
317 unsigned char *desc = p;
318 unsigned int start = 0;
319 int offset = sdll % XCOPY_SEGMENT_DESC_LEN, rc, ret = 0;
320
321 if (offset != 0) {
322 pr_err("XCOPY segment descriptor list length is not"
323 " multiple of %d\n", XCOPY_SEGMENT_DESC_LEN);
324 return -EINVAL;
325 }
326
327 while (start < sdll) {
328 /*
329 * Check segment descriptor type code for block -> block
330 */
331 switch (desc[0]) {
332 case 0x02:
333 rc = target_xcopy_parse_segdesc_02(se_cmd, xop, desc);
334 if (rc < 0)
335 goto out;
336
337 ret++;
338 start += XCOPY_SEGMENT_DESC_LEN;
339 desc += XCOPY_SEGMENT_DESC_LEN;
340 break;
341 default:
342 pr_err("XCOPY unspported segment descriptor"
343 "type: 0x%02x\n", desc[0]);
344 goto out;
345 }
346 }
347
348 return ret;
349
350out:
351 return -EINVAL;
352}
353
354/*
355 * Start xcopy_pt ops
356 */
357
358struct xcopy_pt_cmd {
359 bool remote_port;
360 struct se_cmd se_cmd;
361 struct xcopy_op *xcopy_op;
362 struct completion xpt_passthrough_sem;
363};
364
365static struct se_port xcopy_pt_port;
366static struct se_portal_group xcopy_pt_tpg;
367static struct se_session xcopy_pt_sess;
368static struct se_node_acl xcopy_pt_nacl;
369
370static char *xcopy_pt_get_fabric_name(void)
371{
372 return "xcopy-pt";
373}
374
375static u32 xcopy_pt_get_tag(struct se_cmd *se_cmd)
376{
377 return 0;
378}
379
380static int xcopy_pt_get_cmd_state(struct se_cmd *se_cmd)
381{
382 return 0;
383}
384
385static void xcopy_pt_undepend_remotedev(struct xcopy_op *xop)
386{
387 struct configfs_subsystem *subsys = target_core_subsystem[0];
388 struct se_device *remote_dev;
389
390 if (xop->op_origin == XCOL_SOURCE_RECV_OP)
391 remote_dev = xop->dst_dev;
392 else
393 remote_dev = xop->src_dev;
394
395 pr_debug("Calling configfs_undepend_item for subsys: %p"
396 " remote_dev: %p remote_dev->dev_group: %p\n",
397 subsys, remote_dev, &remote_dev->dev_group.cg_item);
398
399 configfs_undepend_item(subsys, &remote_dev->dev_group.cg_item);
400}
401
402static void xcopy_pt_release_cmd(struct se_cmd *se_cmd)
403{
404 struct xcopy_pt_cmd *xpt_cmd = container_of(se_cmd,
405 struct xcopy_pt_cmd, se_cmd);
406
407 if (xpt_cmd->remote_port)
408 kfree(se_cmd->se_lun);
409
410 kfree(xpt_cmd);
411}
412
413static int xcopy_pt_check_stop_free(struct se_cmd *se_cmd)
414{
415 struct xcopy_pt_cmd *xpt_cmd = container_of(se_cmd,
416 struct xcopy_pt_cmd, se_cmd);
417
418 complete(&xpt_cmd->xpt_passthrough_sem);
419 return 0;
420}
421
422static int xcopy_pt_write_pending(struct se_cmd *se_cmd)
423{
424 return 0;
425}
426
427static int xcopy_pt_write_pending_status(struct se_cmd *se_cmd)
428{
429 return 0;
430}
431
432static int xcopy_pt_queue_data_in(struct se_cmd *se_cmd)
433{
434 return 0;
435}
436
437static int xcopy_pt_queue_status(struct se_cmd *se_cmd)
438{
439 return 0;
440}
441
442static struct target_core_fabric_ops xcopy_pt_tfo = {
443 .get_fabric_name = xcopy_pt_get_fabric_name,
444 .get_task_tag = xcopy_pt_get_tag,
445 .get_cmd_state = xcopy_pt_get_cmd_state,
446 .release_cmd = xcopy_pt_release_cmd,
447 .check_stop_free = xcopy_pt_check_stop_free,
448 .write_pending = xcopy_pt_write_pending,
449 .write_pending_status = xcopy_pt_write_pending_status,
450 .queue_data_in = xcopy_pt_queue_data_in,
451 .queue_status = xcopy_pt_queue_status,
452};
453
454/*
455 * End xcopy_pt_ops
456 */
457
458int target_xcopy_setup_pt(void)
459{
460 xcopy_wq = alloc_workqueue("xcopy_wq", WQ_MEM_RECLAIM, 0);
461 if (!xcopy_wq) {
462 pr_err("Unable to allocate xcopy_wq\n");
463 return -ENOMEM;
464 }
465
466 memset(&xcopy_pt_port, 0, sizeof(struct se_port));
467 INIT_LIST_HEAD(&xcopy_pt_port.sep_alua_list);
468 INIT_LIST_HEAD(&xcopy_pt_port.sep_list);
469 mutex_init(&xcopy_pt_port.sep_tg_pt_md_mutex);
470
471 memset(&xcopy_pt_tpg, 0, sizeof(struct se_portal_group));
472 INIT_LIST_HEAD(&xcopy_pt_tpg.se_tpg_node);
473 INIT_LIST_HEAD(&xcopy_pt_tpg.acl_node_list);
474 INIT_LIST_HEAD(&xcopy_pt_tpg.tpg_sess_list);
475
476 xcopy_pt_port.sep_tpg = &xcopy_pt_tpg;
477 xcopy_pt_tpg.se_tpg_tfo = &xcopy_pt_tfo;
478
479 memset(&xcopy_pt_nacl, 0, sizeof(struct se_node_acl));
480 INIT_LIST_HEAD(&xcopy_pt_nacl.acl_list);
481 INIT_LIST_HEAD(&xcopy_pt_nacl.acl_sess_list);
482 memset(&xcopy_pt_sess, 0, sizeof(struct se_session));
483 INIT_LIST_HEAD(&xcopy_pt_sess.sess_list);
484 INIT_LIST_HEAD(&xcopy_pt_sess.sess_acl_list);
485
486 xcopy_pt_nacl.se_tpg = &xcopy_pt_tpg;
487 xcopy_pt_nacl.nacl_sess = &xcopy_pt_sess;
488
489 xcopy_pt_sess.se_tpg = &xcopy_pt_tpg;
490 xcopy_pt_sess.se_node_acl = &xcopy_pt_nacl;
491
492 return 0;
493}
494
495void target_xcopy_release_pt(void)
496{
497 if (xcopy_wq)
498 destroy_workqueue(xcopy_wq);
499}
500
501static void target_xcopy_setup_pt_port(
502 struct xcopy_pt_cmd *xpt_cmd,
503 struct xcopy_op *xop,
504 bool remote_port)
505{
506 struct se_cmd *ec_cmd = xop->xop_se_cmd;
507 struct se_cmd *pt_cmd = &xpt_cmd->se_cmd;
508
509 if (xop->op_origin == XCOL_SOURCE_RECV_OP) {
510 /*
511 * Honor destination port reservations for X-COPY PUSH emulation
512 * when CDB is received on local source port, and READs blocks to
513 * WRITE on remote destination port.
514 */
515 if (remote_port) {
516 xpt_cmd->remote_port = remote_port;
517 pt_cmd->se_lun->lun_sep = &xcopy_pt_port;
518 pr_debug("Setup emulated remote DEST xcopy_pt_port: %p to"
519 " cmd->se_lun->lun_sep for X-COPY data PUSH\n",
520 pt_cmd->se_lun->lun_sep);
521 } else {
522 pt_cmd->se_lun = ec_cmd->se_lun;
523 pt_cmd->se_dev = ec_cmd->se_dev;
524
525 pr_debug("Honoring local SRC port from ec_cmd->se_dev:"
526 " %p\n", pt_cmd->se_dev);
527 pt_cmd->se_lun = ec_cmd->se_lun;
528 pr_debug("Honoring local SRC port from ec_cmd->se_lun: %p\n",
529 pt_cmd->se_lun);
530 }
531 } else {
532 /*
533 * Honor source port reservation for X-COPY PULL emulation
534 * when CDB is received on local desintation port, and READs
535 * blocks from the remote source port to WRITE on local
536 * destination port.
537 */
538 if (remote_port) {
539 xpt_cmd->remote_port = remote_port;
540 pt_cmd->se_lun->lun_sep = &xcopy_pt_port;
541 pr_debug("Setup emulated remote SRC xcopy_pt_port: %p to"
542 " cmd->se_lun->lun_sep for X-COPY data PULL\n",
543 pt_cmd->se_lun->lun_sep);
544 } else {
545 pt_cmd->se_lun = ec_cmd->se_lun;
546 pt_cmd->se_dev = ec_cmd->se_dev;
547
548 pr_debug("Honoring local DST port from ec_cmd->se_dev:"
549 " %p\n", pt_cmd->se_dev);
550 pt_cmd->se_lun = ec_cmd->se_lun;
551 pr_debug("Honoring local DST port from ec_cmd->se_lun: %p\n",
552 pt_cmd->se_lun);
553 }
554 }
555}
556
557static int target_xcopy_init_pt_lun(
558 struct xcopy_pt_cmd *xpt_cmd,
559 struct xcopy_op *xop,
560 struct se_device *se_dev,
561 struct se_cmd *pt_cmd,
562 bool remote_port)
563{
564 /*
565 * Don't allocate + init an pt_cmd->se_lun if honoring local port for
566 * reservations. The pt_cmd->se_lun pointer will be setup from within
567 * target_xcopy_setup_pt_port()
568 */
569 if (remote_port == false) {
570 pt_cmd->se_cmd_flags |= SCF_SE_LUN_CMD | SCF_CMD_XCOPY_PASSTHROUGH;
571 return 0;
572 }
573
574 pt_cmd->se_lun = kzalloc(sizeof(struct se_lun), GFP_KERNEL);
575 if (!pt_cmd->se_lun) {
576 pr_err("Unable to allocate pt_cmd->se_lun\n");
577 return -ENOMEM;
578 }
579 init_completion(&pt_cmd->se_lun->lun_shutdown_comp);
580 INIT_LIST_HEAD(&pt_cmd->se_lun->lun_cmd_list);
581 INIT_LIST_HEAD(&pt_cmd->se_lun->lun_acl_list);
582 spin_lock_init(&pt_cmd->se_lun->lun_acl_lock);
583 spin_lock_init(&pt_cmd->se_lun->lun_cmd_lock);
584 spin_lock_init(&pt_cmd->se_lun->lun_sep_lock);
585
586 pt_cmd->se_dev = se_dev;
587
588 pr_debug("Setup emulated se_dev: %p from se_dev\n", pt_cmd->se_dev);
589 pt_cmd->se_lun->lun_se_dev = se_dev;
590 pt_cmd->se_cmd_flags |= SCF_SE_LUN_CMD | SCF_CMD_XCOPY_PASSTHROUGH;
591
592 pr_debug("Setup emulated se_dev: %p to pt_cmd->se_lun->lun_se_dev\n",
593 pt_cmd->se_lun->lun_se_dev);
594
595 return 0;
596}
597
598static int target_xcopy_setup_pt_cmd(
599 struct xcopy_pt_cmd *xpt_cmd,
600 struct xcopy_op *xop,
601 struct se_device *se_dev,
602 unsigned char *cdb,
603 bool remote_port,
604 bool alloc_mem)
605{
606 struct se_cmd *cmd = &xpt_cmd->se_cmd;
607 sense_reason_t sense_rc;
608 int ret = 0, rc;
609 /*
610 * Setup LUN+port to honor reservations based upon xop->op_origin for
611 * X-COPY PUSH or X-COPY PULL based upon where the CDB was received.
612 */
613 rc = target_xcopy_init_pt_lun(xpt_cmd, xop, se_dev, cmd, remote_port);
614 if (rc < 0) {
615 ret = rc;
616 goto out;
617 }
618 xpt_cmd->xcopy_op = xop;
619 target_xcopy_setup_pt_port(xpt_cmd, xop, remote_port);
620
621 sense_rc = target_setup_cmd_from_cdb(cmd, cdb);
622 if (sense_rc) {
623 ret = -EINVAL;
624 goto out;
625 }
626
627 if (alloc_mem) {
628 rc = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents,
629 cmd->data_length, false);
630 if (rc < 0) {
631 ret = rc;
632 goto out;
633 }
634 /*
635 * Set this bit so that transport_free_pages() allows the
636 * caller to release SGLs + physical memory allocated by
637 * transport_generic_get_mem()..
638 */
639 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
640 } else {
641 /*
642 * Here the previously allocated SGLs for the internal READ
643 * are mapped zero-copy to the internal WRITE.
644 */
645 sense_rc = transport_generic_map_mem_to_cmd(cmd,
646 xop->xop_data_sg, xop->xop_data_nents,
647 NULL, 0);
648 if (sense_rc) {
649 ret = -EINVAL;
650 goto out;
651 }
652
653 pr_debug("Setup PASSTHROUGH_NOALLOC t_data_sg: %p t_data_nents:"
654 " %u\n", cmd->t_data_sg, cmd->t_data_nents);
655 }
656
657 return 0;
658
659out:
660 if (remote_port == true)
661 kfree(cmd->se_lun);
662 return ret;
663}
664
665static int target_xcopy_issue_pt_cmd(struct xcopy_pt_cmd *xpt_cmd)
666{
667 struct se_cmd *se_cmd = &xpt_cmd->se_cmd;
668 sense_reason_t sense_rc;
669
670 sense_rc = transport_generic_new_cmd(se_cmd);
671 if (sense_rc)
672 return -EINVAL;
673
674 if (se_cmd->data_direction == DMA_TO_DEVICE)
675 target_execute_cmd(se_cmd);
676
677 wait_for_completion_interruptible(&xpt_cmd->xpt_passthrough_sem);
678
679 pr_debug("target_xcopy_issue_pt_cmd(): SCSI status: 0x%02x\n",
680 se_cmd->scsi_status);
681 return 0;
682}
683
684static int target_xcopy_read_source(
685 struct se_cmd *ec_cmd,
686 struct xcopy_op *xop,
687 struct se_device *src_dev,
688 sector_t src_lba,
689 u32 src_sectors)
690{
691 struct xcopy_pt_cmd *xpt_cmd;
692 struct se_cmd *se_cmd;
693 u32 length = (src_sectors * src_dev->dev_attrib.block_size);
694 int rc;
695 unsigned char cdb[16];
696 bool remote_port = (xop->op_origin == XCOL_DEST_RECV_OP);
697
698 xpt_cmd = kzalloc(sizeof(struct xcopy_pt_cmd), GFP_KERNEL);
699 if (!xpt_cmd) {
700 pr_err("Unable to allocate xcopy_pt_cmd\n");
701 return -ENOMEM;
702 }
703 init_completion(&xpt_cmd->xpt_passthrough_sem);
704 se_cmd = &xpt_cmd->se_cmd;
705
706 memset(&cdb[0], 0, 16);
707 cdb[0] = READ_16;
708 put_unaligned_be64(src_lba, &cdb[2]);
709 put_unaligned_be32(src_sectors, &cdb[10]);
710 pr_debug("XCOPY: Built READ_16: LBA: %llu Sectors: %u Length: %u\n",
711 (unsigned long long)src_lba, src_sectors, length);
712
713 transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, NULL, length,
714 DMA_FROM_DEVICE, 0, NULL);
715 xop->src_pt_cmd = xpt_cmd;
716
717 rc = target_xcopy_setup_pt_cmd(xpt_cmd, xop, src_dev, &cdb[0],
718 remote_port, true);
719 if (rc < 0) {
720 transport_generic_free_cmd(se_cmd, 0);
721 return rc;
722 }
723
724 xop->xop_data_sg = se_cmd->t_data_sg;
725 xop->xop_data_nents = se_cmd->t_data_nents;
726 pr_debug("XCOPY-READ: Saved xop->xop_data_sg: %p, num: %u for READ"
727 " memory\n", xop->xop_data_sg, xop->xop_data_nents);
728
729 rc = target_xcopy_issue_pt_cmd(xpt_cmd);
730 if (rc < 0) {
731 transport_generic_free_cmd(se_cmd, 0);
732 return rc;
733 }
734 /*
735 * Clear off the allocated t_data_sg, that has been saved for
736 * zero-copy WRITE submission reuse in struct xcopy_op..
737 */
738 se_cmd->t_data_sg = NULL;
739 se_cmd->t_data_nents = 0;
740
741 return 0;
742}
743
744static int target_xcopy_write_destination(
745 struct se_cmd *ec_cmd,
746 struct xcopy_op *xop,
747 struct se_device *dst_dev,
748 sector_t dst_lba,
749 u32 dst_sectors)
750{
751 struct xcopy_pt_cmd *xpt_cmd;
752 struct se_cmd *se_cmd;
753 u32 length = (dst_sectors * dst_dev->dev_attrib.block_size);
754 int rc;
755 unsigned char cdb[16];
756 bool remote_port = (xop->op_origin == XCOL_SOURCE_RECV_OP);
757
758 xpt_cmd = kzalloc(sizeof(struct xcopy_pt_cmd), GFP_KERNEL);
759 if (!xpt_cmd) {
760 pr_err("Unable to allocate xcopy_pt_cmd\n");
761 return -ENOMEM;
762 }
763 init_completion(&xpt_cmd->xpt_passthrough_sem);
764 se_cmd = &xpt_cmd->se_cmd;
765
766 memset(&cdb[0], 0, 16);
767 cdb[0] = WRITE_16;
768 put_unaligned_be64(dst_lba, &cdb[2]);
769 put_unaligned_be32(dst_sectors, &cdb[10]);
770 pr_debug("XCOPY: Built WRITE_16: LBA: %llu Sectors: %u Length: %u\n",
771 (unsigned long long)dst_lba, dst_sectors, length);
772
773 transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, NULL, length,
774 DMA_TO_DEVICE, 0, NULL);
775 xop->dst_pt_cmd = xpt_cmd;
776
777 rc = target_xcopy_setup_pt_cmd(xpt_cmd, xop, dst_dev, &cdb[0],
778 remote_port, false);
779 if (rc < 0) {
780 struct se_cmd *src_cmd = &xop->src_pt_cmd->se_cmd;
781 /*
782 * If the failure happened before the t_mem_list hand-off in
783 * target_xcopy_setup_pt_cmd(), Reset memory + clear flag so that
784 * core releases this memory on error during X-COPY WRITE I/O.
785 */
786 src_cmd->se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
787 src_cmd->t_data_sg = xop->xop_data_sg;
788 src_cmd->t_data_nents = xop->xop_data_nents;
789
790 transport_generic_free_cmd(se_cmd, 0);
791 return rc;
792 }
793
794 rc = target_xcopy_issue_pt_cmd(xpt_cmd);
795 if (rc < 0) {
796 se_cmd->se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
797 transport_generic_free_cmd(se_cmd, 0);
798 return rc;
799 }
800
801 return 0;
802}
803
804static void target_xcopy_do_work(struct work_struct *work)
805{
806 struct xcopy_op *xop = container_of(work, struct xcopy_op, xop_work);
807 struct se_device *src_dev = xop->src_dev, *dst_dev = xop->dst_dev;
808 struct se_cmd *ec_cmd = xop->xop_se_cmd;
809 sector_t src_lba = xop->src_lba, dst_lba = xop->dst_lba, end_lba;
810 unsigned int max_sectors;
811 int rc;
812 unsigned short nolb = xop->nolb, cur_nolb, max_nolb, copied_nolb = 0;
813
814 end_lba = src_lba + nolb;
815 /*
816 * Break up XCOPY I/O into hw_max_sectors sized I/O based on the
817 * smallest max_sectors between src_dev + dev_dev, or
818 */
819 max_sectors = min(src_dev->dev_attrib.hw_max_sectors,
820 dst_dev->dev_attrib.hw_max_sectors);
821 max_sectors = min_t(u32, max_sectors, XCOPY_MAX_SECTORS);
822
823 max_nolb = min_t(u16, max_sectors, ((u16)(~0U)));
824
825 pr_debug("target_xcopy_do_work: nolb: %hu, max_nolb: %hu end_lba: %llu\n",
826 nolb, max_nolb, (unsigned long long)end_lba);
827 pr_debug("target_xcopy_do_work: Starting src_lba: %llu, dst_lba: %llu\n",
828 (unsigned long long)src_lba, (unsigned long long)dst_lba);
829
830 while (src_lba < end_lba) {
831 cur_nolb = min(nolb, max_nolb);
832
833 pr_debug("target_xcopy_do_work: Calling read src_dev: %p src_lba: %llu,"
834 " cur_nolb: %hu\n", src_dev, (unsigned long long)src_lba, cur_nolb);
835
836 rc = target_xcopy_read_source(ec_cmd, xop, src_dev, src_lba, cur_nolb);
837 if (rc < 0)
838 goto out;
839
840 src_lba += cur_nolb;
841 pr_debug("target_xcopy_do_work: Incremented READ src_lba to %llu\n",
842 (unsigned long long)src_lba);
843
844 pr_debug("target_xcopy_do_work: Calling write dst_dev: %p dst_lba: %llu,"
845 " cur_nolb: %hu\n", dst_dev, (unsigned long long)dst_lba, cur_nolb);
846
847 rc = target_xcopy_write_destination(ec_cmd, xop, dst_dev,
848 dst_lba, cur_nolb);
849 if (rc < 0) {
850 transport_generic_free_cmd(&xop->src_pt_cmd->se_cmd, 0);
851 goto out;
852 }
853
854 dst_lba += cur_nolb;
855 pr_debug("target_xcopy_do_work: Incremented WRITE dst_lba to %llu\n",
856 (unsigned long long)dst_lba);
857
858 copied_nolb += cur_nolb;
859 nolb -= cur_nolb;
860
861 transport_generic_free_cmd(&xop->src_pt_cmd->se_cmd, 0);
862 xop->dst_pt_cmd->se_cmd.se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
863
864 transport_generic_free_cmd(&xop->dst_pt_cmd->se_cmd, 0);
865 }
866
867 xcopy_pt_undepend_remotedev(xop);
868 kfree(xop);
869
870 pr_debug("target_xcopy_do_work: Final src_lba: %llu, dst_lba: %llu\n",
871 (unsigned long long)src_lba, (unsigned long long)dst_lba);
872 pr_debug("target_xcopy_do_work: Blocks copied: %hu, Bytes Copied: %u\n",
873 copied_nolb, copied_nolb * dst_dev->dev_attrib.block_size);
874
875 pr_debug("target_xcopy_do_work: Setting X-COPY GOOD status -> sending response\n");
876 target_complete_cmd(ec_cmd, SAM_STAT_GOOD);
877 return;
878
879out:
880 xcopy_pt_undepend_remotedev(xop);
881 kfree(xop);
882
883 pr_warn("target_xcopy_do_work: Setting X-COPY CHECK_CONDITION -> sending response\n");
884 ec_cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
885 target_complete_cmd(ec_cmd, SAM_STAT_CHECK_CONDITION);
886}
887
888sense_reason_t target_do_xcopy(struct se_cmd *se_cmd)
889{
acb3f260 890 struct se_device *dev = se_cmd->se_dev;
cbf031f4
NB		 891 struct xcopy_op *xop = NULL;
892 unsigned char *p = NULL, *seg_desc;
893 unsigned int list_id, list_id_usage, sdll, inline_dl, sa;
894 int rc;
895 unsigned short tdll;
896
acb3f260
NB		 897 if (!dev->dev_attrib.emulate_3pc) {
898 pr_err("EXTENDED_COPY operation explicitly disabled\n");
899 return TCM_UNSUPPORTED_SCSI_OPCODE;
900 }
901
cbf031f4
NB		 902 sa = se_cmd->t_task_cdb[1] & 0x1f;
903 if (sa != 0x00) {
904 pr_err("EXTENDED_COPY(LID4) not supported\n");
905 return TCM_UNSUPPORTED_SCSI_OPCODE;
906 }
907
934a138e
NB		 908 xop = kzalloc(sizeof(struct xcopy_op), GFP_KERNEL);
909 if (!xop) {
910 pr_err("Unable to allocate xcopy_op\n");
911 return TCM_OUT_OF_RESOURCES;
912 }
913 xop->xop_se_cmd = se_cmd;
914
cbf031f4
NB		 915 p = transport_kmap_data_sg(se_cmd);
916 if (!p) {
917 pr_err("transport_kmap_data_sg() failed in target_do_xcopy\n");
934a138e 918 kfree(xop);
cbf031f4
NB		 919 return TCM_OUT_OF_RESOURCES;
920 }
921
922 list_id = p[0];
3f7a46c6
NB		 923 list_id_usage = (p[1] & 0x18) >> 3;
924
cbf031f4
NB		 925 /*
926 * Determine TARGET DESCRIPTOR LIST LENGTH + SEGMENT DESCRIPTOR LIST LENGTH
927 */
928 tdll = get_unaligned_be16(&p[2]);
929 sdll = get_unaligned_be32(&p[8]);
930
931 inline_dl = get_unaligned_be32(&p[12]);
932 if (inline_dl != 0) {
933 pr_err("XCOPY with non zero inline data length\n");
934 goto out;
935 }
936
cbf031f4
NB		 937 pr_debug("Processing XCOPY with list_id: 0x%02x list_id_usage: 0x%02x"
938 " tdll: %hu sdll: %u inline_dl: %u\n", list_id, list_id_usage,
939 tdll, sdll, inline_dl);
940
941 rc = target_xcopy_parse_target_descriptors(se_cmd, xop, &p[16], tdll);
942 if (rc <= 0)
943 goto out;
944
945 pr_debug("XCOPY: Processed %d target descriptors, length: %u\n", rc,
946 rc * XCOPY_TARGET_DESC_LEN);
947 seg_desc = &p[16];
948 seg_desc += (rc * XCOPY_TARGET_DESC_LEN);
949
950 rc = target_xcopy_parse_segment_descriptors(se_cmd, xop, seg_desc, sdll);
951 if (rc <= 0) {
952 xcopy_pt_undepend_remotedev(xop);
953 goto out;
954 }
955 transport_kunmap_data_sg(se_cmd);
956
957 pr_debug("XCOPY: Processed %d segment descriptors, length: %u\n", rc,
958 rc * XCOPY_SEGMENT_DESC_LEN);
959 INIT_WORK(&xop->xop_work, target_xcopy_do_work);
960 queue_work(xcopy_wq, &xop->xop_work);
961 return TCM_NO_SENSE;
962
963out:
964 if (p)
965 transport_kunmap_data_sg(se_cmd);
966 kfree(xop);
934a138e 967 return TCM_INVALID_PARAMETER_LIST;
cbf031f4
NB		 968}
969
970static sense_reason_t target_rcr_operating_parameters(struct se_cmd *se_cmd)
971{
972 unsigned char *p;
973
974 p = transport_kmap_data_sg(se_cmd);
975 if (!p) {
976 pr_err("transport_kmap_data_sg failed in"
977 " target_rcr_operating_parameters\n");
978 return TCM_OUT_OF_RESOURCES;
979 }
980
981 if (se_cmd->data_length < 54) {
982 pr_err("Receive Copy Results Op Parameters length"
983 " too small: %u\n", se_cmd->data_length);
984 transport_kunmap_data_sg(se_cmd);
985 return TCM_INVALID_CDB_FIELD;
986 }
987 /*
988 * Set SNLID=1 (Supports no List ID)
989 */
990 p[4] = 0x1;
991 /*
992 * MAXIMUM TARGET DESCRIPTOR COUNT
993 */
994 put_unaligned_be16(RCR_OP_MAX_TARGET_DESC_COUNT, &p[8]);
995 /*
996 * MAXIMUM SEGMENT DESCRIPTOR COUNT
997 */
998 put_unaligned_be16(RCR_OP_MAX_SG_DESC_COUNT, &p[10]);
999 /*
1000 * MAXIMUM DESCRIPTOR LIST LENGTH
1001 */
1002 put_unaligned_be32(RCR_OP_MAX_DESC_LIST_LEN, &p[12]);
1003 /*
1004 * MAXIMUM SEGMENT LENGTH
1005 */
1006 put_unaligned_be32(RCR_OP_MAX_SEGMENT_LEN, &p[16]);
1007 /*
1008 * MAXIMUM INLINE DATA LENGTH for SA 0x04 (NOT SUPPORTED)
1009 */
1010 put_unaligned_be32(0x0, &p[20]);
1011 /*
1012 * HELD DATA LIMIT
1013 */
1014 put_unaligned_be32(0x0, &p[24]);
1015 /*
1016 * MAXIMUM STREAM DEVICE TRANSFER SIZE
1017 */
1018 put_unaligned_be32(0x0, &p[28]);
1019 /*
1020 * TOTAL CONCURRENT COPIES
1021 */
1022 put_unaligned_be16(RCR_OP_TOTAL_CONCURR_COPIES, &p[34]);
1023 /*
1024 * MAXIMUM CONCURRENT COPIES
1025 */
1026 p[36] = RCR_OP_MAX_CONCURR_COPIES;
1027 /*
1028 * DATA SEGMENT GRANULARITY (log 2)
1029 */
1030 p[37] = RCR_OP_DATA_SEG_GRAN_LOG2;
1031 /*
1032 * INLINE DATA GRANULARITY log 2)
1033 */
1034 p[38] = RCR_OP_INLINE_DATA_GRAN_LOG2;
1035 /*
1036 * HELD DATA GRANULARITY
1037 */
1038 p[39] = RCR_OP_HELD_DATA_GRAN_LOG2;
1039 /*
1040 * IMPLEMENTED DESCRIPTOR LIST LENGTH
1041 */
1042 p[43] = 0x2;
1043 /*
1044 * List of implemented descriptor type codes (ordered)
1045 */
1046 p[44] = 0x02; /* Copy Block to Block device */
1047 p[45] = 0xe4; /* Identification descriptor target descriptor */
1048
1049 /*
1050 * AVAILABLE DATA (n-3)
1051 */
1052 put_unaligned_be32(42, &p[0]);
1053
1054 transport_kunmap_data_sg(se_cmd);
1055 target_complete_cmd(se_cmd, GOOD);
1056
1057 return TCM_NO_SENSE;
1058}
1059
1060sense_reason_t target_do_receive_copy_results(struct se_cmd *se_cmd)
1061{
1062 unsigned char *cdb = &se_cmd->t_task_cdb[0];
1063 int sa = (cdb[1] & 0x1f), list_id = cdb[2];
1064 sense_reason_t rc = TCM_NO_SENSE;
1065
1066 pr_debug("Entering target_do_receive_copy_results: SA: 0x%02x, List ID:"
1067 " 0x%02x, AL: %u\n", sa, list_id, se_cmd->data_length);
1068
1069 if (list_id != 0) {
1070 pr_err("Receive Copy Results with non zero list identifier"
1071 " not supported\n");
1072 return TCM_INVALID_CDB_FIELD;
1073 }
1074
1075 switch (sa) {
1076 case RCR_SA_OPERATING_PARAMETERS:
1077 rc = target_rcr_operating_parameters(se_cmd);
1078 break;
1079 case RCR_SA_COPY_STATUS:
1080 case RCR_SA_RECEIVE_DATA:
1081 case RCR_SA_FAILED_SEGMENT_DETAILS:
1082 default:
1083 pr_err("Unsupported SA for receive copy results: 0x%02x\n", sa);
1084 return TCM_INVALID_CDB_FIELD;
1085 }
1086
1087 return rc;
1088}
Linux kernel - Deliverables
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