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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> | |
ba929992 | 28 | #include <scsi/scsi_proto.h> |
cbf031f4 NB |
29 | #include <asm/unaligned.h> |
30 | ||
31 | #include <target/target_core_base.h> | |
32 | #include <target/target_core_backend.h> | |
33 | #include <target/target_core_fabric.h> | |
cbf031f4 | 34 | |
b13876d2 | 35 | #include "target_core_internal.h" |
cbf031f4 NB |
36 | #include "target_core_pr.h" |
37 | #include "target_core_ua.h" | |
38 | #include "target_core_xcopy.h" | |
39 | ||
40 | static struct workqueue_struct *xcopy_wq = NULL; | |
cbf031f4 NB |
41 | |
42 | static int target_xcopy_gen_naa_ieee(struct se_device *dev, unsigned char *buf) | |
43 | { | |
44 | int off = 0; | |
45 | ||
46 | buf[off++] = (0x6 << 4); | |
47 | buf[off++] = 0x01; | |
48 | buf[off++] = 0x40; | |
49 | buf[off] = (0x5 << 4); | |
50 | ||
51 | spc_parse_naa_6h_vendor_specific(dev, &buf[off]); | |
52 | return 0; | |
53 | } | |
54 | ||
55 | static int target_xcopy_locate_se_dev_e4(struct se_cmd *se_cmd, struct xcopy_op *xop, | |
56 | bool src) | |
57 | { | |
58 | struct se_device *se_dev; | |
cbf031f4 NB |
59 | unsigned char tmp_dev_wwn[XCOPY_NAA_IEEE_REGEX_LEN], *dev_wwn; |
60 | int rc; | |
61 | ||
0bcc297e | 62 | if (src) |
cbf031f4 NB |
63 | dev_wwn = &xop->dst_tid_wwn[0]; |
64 | else | |
65 | dev_wwn = &xop->src_tid_wwn[0]; | |
66 | ||
67 | mutex_lock(&g_device_mutex); | |
68 | list_for_each_entry(se_dev, &g_device_list, g_dev_node) { | |
69 | ||
acb3f260 NB |
70 | if (!se_dev->dev_attrib.emulate_3pc) |
71 | continue; | |
72 | ||
cbf031f4 NB |
73 | memset(&tmp_dev_wwn[0], 0, XCOPY_NAA_IEEE_REGEX_LEN); |
74 | target_xcopy_gen_naa_ieee(se_dev, &tmp_dev_wwn[0]); | |
75 | ||
76 | rc = memcmp(&tmp_dev_wwn[0], dev_wwn, XCOPY_NAA_IEEE_REGEX_LEN); | |
77 | if (rc != 0) | |
78 | continue; | |
79 | ||
0bcc297e | 80 | if (src) { |
cbf031f4 NB |
81 | xop->dst_dev = se_dev; |
82 | pr_debug("XCOPY 0xe4: Setting xop->dst_dev: %p from located" | |
83 | " se_dev\n", xop->dst_dev); | |
84 | } else { | |
85 | xop->src_dev = se_dev; | |
86 | pr_debug("XCOPY 0xe4: Setting xop->src_dev: %p from located" | |
87 | " se_dev\n", xop->src_dev); | |
88 | } | |
89 | ||
d588cf8f | 90 | rc = target_depend_item(&se_dev->dev_group.cg_item); |
cbf031f4 NB |
91 | if (rc != 0) { |
92 | pr_err("configfs_depend_item attempt failed:" | |
93 | " %d for se_dev: %p\n", rc, se_dev); | |
94 | mutex_unlock(&g_device_mutex); | |
95 | return rc; | |
96 | } | |
97 | ||
d588cf8f CH |
98 | pr_debug("Called configfs_depend_item for se_dev: %p" |
99 | " se_dev->se_dev_group: %p\n", se_dev, | |
cbf031f4 NB |
100 | &se_dev->dev_group); |
101 | ||
102 | mutex_unlock(&g_device_mutex); | |
103 | return 0; | |
104 | } | |
105 | mutex_unlock(&g_device_mutex); | |
106 | ||
107 | pr_err("Unable to locate 0xe4 descriptor for EXTENDED_COPY\n"); | |
108 | return -EINVAL; | |
109 | } | |
110 | ||
111 | static int target_xcopy_parse_tiddesc_e4(struct se_cmd *se_cmd, struct xcopy_op *xop, | |
112 | unsigned char *p, bool src) | |
113 | { | |
114 | unsigned char *desc = p; | |
115 | unsigned short ript; | |
116 | u8 desig_len; | |
117 | /* | |
118 | * Extract RELATIVE INITIATOR PORT IDENTIFIER | |
119 | */ | |
120 | ript = get_unaligned_be16(&desc[2]); | |
121 | pr_debug("XCOPY 0xe4: RELATIVE INITIATOR PORT IDENTIFIER: %hu\n", ript); | |
122 | /* | |
123 | * Check for supported code set, association, and designator type | |
124 | */ | |
125 | if ((desc[4] & 0x0f) != 0x1) { | |
126 | pr_err("XCOPY 0xe4: code set of non binary type not supported\n"); | |
127 | return -EINVAL; | |
128 | } | |
129 | if ((desc[5] & 0x30) != 0x00) { | |
130 | pr_err("XCOPY 0xe4: association other than LUN not supported\n"); | |
131 | return -EINVAL; | |
132 | } | |
133 | if ((desc[5] & 0x0f) != 0x3) { | |
134 | pr_err("XCOPY 0xe4: designator type unsupported: 0x%02x\n", | |
135 | (desc[5] & 0x0f)); | |
136 | return -EINVAL; | |
137 | } | |
138 | /* | |
139 | * Check for matching 16 byte length for NAA IEEE Registered Extended | |
140 | * Assigned designator | |
141 | */ | |
142 | desig_len = desc[7]; | |
143 | if (desig_len != 16) { | |
144 | pr_err("XCOPY 0xe4: invalid desig_len: %d\n", (int)desig_len); | |
145 | return -EINVAL; | |
146 | } | |
147 | pr_debug("XCOPY 0xe4: desig_len: %d\n", (int)desig_len); | |
148 | /* | |
149 | * Check for NAA IEEE Registered Extended Assigned header.. | |
150 | */ | |
151 | if ((desc[8] & 0xf0) != 0x60) { | |
152 | pr_err("XCOPY 0xe4: Unsupported DESIGNATOR TYPE: 0x%02x\n", | |
153 | (desc[8] & 0xf0)); | |
154 | return -EINVAL; | |
155 | } | |
156 | ||
0bcc297e | 157 | if (src) { |
cbf031f4 NB |
158 | memcpy(&xop->src_tid_wwn[0], &desc[8], XCOPY_NAA_IEEE_REGEX_LEN); |
159 | /* | |
160 | * Determine if the source designator matches the local device | |
161 | */ | |
162 | if (!memcmp(&xop->local_dev_wwn[0], &xop->src_tid_wwn[0], | |
163 | XCOPY_NAA_IEEE_REGEX_LEN)) { | |
164 | xop->op_origin = XCOL_SOURCE_RECV_OP; | |
165 | xop->src_dev = se_cmd->se_dev; | |
166 | pr_debug("XCOPY 0xe4: Set xop->src_dev %p from source" | |
167 | " received xop\n", xop->src_dev); | |
168 | } | |
169 | } else { | |
170 | memcpy(&xop->dst_tid_wwn[0], &desc[8], XCOPY_NAA_IEEE_REGEX_LEN); | |
171 | /* | |
172 | * Determine if the destination designator matches the local device | |
173 | */ | |
174 | if (!memcmp(&xop->local_dev_wwn[0], &xop->dst_tid_wwn[0], | |
175 | XCOPY_NAA_IEEE_REGEX_LEN)) { | |
176 | xop->op_origin = XCOL_DEST_RECV_OP; | |
177 | xop->dst_dev = se_cmd->se_dev; | |
178 | pr_debug("XCOPY 0xe4: Set xop->dst_dev: %p from destination" | |
179 | " received xop\n", xop->dst_dev); | |
180 | } | |
181 | } | |
182 | ||
183 | return 0; | |
184 | } | |
185 | ||
186 | static int target_xcopy_parse_target_descriptors(struct se_cmd *se_cmd, | |
187 | struct xcopy_op *xop, unsigned char *p, | |
188 | unsigned short tdll) | |
189 | { | |
190 | struct se_device *local_dev = se_cmd->se_dev; | |
191 | unsigned char *desc = p; | |
192 | int offset = tdll % XCOPY_TARGET_DESC_LEN, rc, ret = 0; | |
193 | unsigned short start = 0; | |
194 | bool src = true; | |
195 | ||
196 | if (offset != 0) { | |
197 | pr_err("XCOPY target descriptor list length is not" | |
198 | " multiple of %d\n", XCOPY_TARGET_DESC_LEN); | |
199 | return -EINVAL; | |
200 | } | |
201 | if (tdll > 64) { | |
202 | pr_err("XCOPY target descriptor supports a maximum" | |
203 | " two src/dest descriptors, tdll: %hu too large..\n", tdll); | |
204 | return -EINVAL; | |
205 | } | |
206 | /* | |
207 | * Generate an IEEE Registered Extended designator based upon the | |
208 | * se_device the XCOPY was received upon.. | |
209 | */ | |
210 | memset(&xop->local_dev_wwn[0], 0, XCOPY_NAA_IEEE_REGEX_LEN); | |
211 | target_xcopy_gen_naa_ieee(local_dev, &xop->local_dev_wwn[0]); | |
212 | ||
213 | while (start < tdll) { | |
214 | /* | |
215 | * Check target descriptor identification with 0xE4 type with | |
216 | * use VPD 0x83 WWPN matching .. | |
217 | */ | |
218 | switch (desc[0]) { | |
219 | case 0xe4: | |
220 | rc = target_xcopy_parse_tiddesc_e4(se_cmd, xop, | |
221 | &desc[0], src); | |
222 | if (rc != 0) | |
223 | goto out; | |
224 | /* | |
225 | * Assume target descriptors are in source -> destination order.. | |
226 | */ | |
0bcc297e | 227 | if (src) |
cbf031f4 NB |
228 | src = false; |
229 | else | |
230 | src = true; | |
231 | start += XCOPY_TARGET_DESC_LEN; | |
232 | desc += XCOPY_TARGET_DESC_LEN; | |
233 | ret++; | |
234 | break; | |
235 | default: | |
236 | pr_err("XCOPY unsupported descriptor type code:" | |
237 | " 0x%02x\n", desc[0]); | |
238 | goto out; | |
239 | } | |
240 | } | |
241 | ||
242 | if (xop->op_origin == XCOL_SOURCE_RECV_OP) | |
243 | rc = target_xcopy_locate_se_dev_e4(se_cmd, xop, true); | |
244 | else | |
245 | rc = target_xcopy_locate_se_dev_e4(se_cmd, xop, false); | |
246 | ||
247 | if (rc < 0) | |
248 | goto out; | |
249 | ||
250 | pr_debug("XCOPY TGT desc: Source dev: %p NAA IEEE WWN: 0x%16phN\n", | |
251 | xop->src_dev, &xop->src_tid_wwn[0]); | |
252 | pr_debug("XCOPY TGT desc: Dest dev: %p NAA IEEE WWN: 0x%16phN\n", | |
253 | xop->dst_dev, &xop->dst_tid_wwn[0]); | |
254 | ||
255 | return ret; | |
256 | ||
257 | out: | |
258 | return -EINVAL; | |
259 | } | |
260 | ||
261 | static int target_xcopy_parse_segdesc_02(struct se_cmd *se_cmd, struct xcopy_op *xop, | |
262 | unsigned char *p) | |
263 | { | |
264 | unsigned char *desc = p; | |
265 | int dc = (desc[1] & 0x02); | |
266 | unsigned short desc_len; | |
267 | ||
268 | desc_len = get_unaligned_be16(&desc[2]); | |
269 | if (desc_len != 0x18) { | |
270 | pr_err("XCOPY segment desc 0x02: Illegal desc_len:" | |
271 | " %hu\n", desc_len); | |
272 | return -EINVAL; | |
273 | } | |
274 | ||
275 | xop->stdi = get_unaligned_be16(&desc[4]); | |
276 | xop->dtdi = get_unaligned_be16(&desc[6]); | |
277 | pr_debug("XCOPY seg desc 0x02: desc_len: %hu stdi: %hu dtdi: %hu, DC: %d\n", | |
278 | desc_len, xop->stdi, xop->dtdi, dc); | |
279 | ||
280 | xop->nolb = get_unaligned_be16(&desc[10]); | |
281 | xop->src_lba = get_unaligned_be64(&desc[12]); | |
282 | xop->dst_lba = get_unaligned_be64(&desc[20]); | |
283 | pr_debug("XCOPY seg desc 0x02: nolb: %hu src_lba: %llu dst_lba: %llu\n", | |
284 | xop->nolb, (unsigned long long)xop->src_lba, | |
285 | (unsigned long long)xop->dst_lba); | |
286 | ||
287 | if (dc != 0) { | |
3e9e01de NB |
288 | xop->dbl = (desc[29] & 0xff) << 16; |
289 | xop->dbl |= (desc[30] & 0xff) << 8; | |
cbf031f4 NB |
290 | xop->dbl |= desc[31] & 0xff; |
291 | ||
292 | pr_debug("XCOPY seg desc 0x02: DC=1 w/ dbl: %u\n", xop->dbl); | |
293 | } | |
294 | return 0; | |
295 | } | |
296 | ||
297 | static int target_xcopy_parse_segment_descriptors(struct se_cmd *se_cmd, | |
298 | struct xcopy_op *xop, unsigned char *p, | |
299 | unsigned int sdll) | |
300 | { | |
301 | unsigned char *desc = p; | |
302 | unsigned int start = 0; | |
303 | int offset = sdll % XCOPY_SEGMENT_DESC_LEN, rc, ret = 0; | |
304 | ||
305 | if (offset != 0) { | |
306 | pr_err("XCOPY segment descriptor list length is not" | |
307 | " multiple of %d\n", XCOPY_SEGMENT_DESC_LEN); | |
308 | return -EINVAL; | |
309 | } | |
310 | ||
311 | while (start < sdll) { | |
312 | /* | |
313 | * Check segment descriptor type code for block -> block | |
314 | */ | |
315 | switch (desc[0]) { | |
316 | case 0x02: | |
317 | rc = target_xcopy_parse_segdesc_02(se_cmd, xop, desc); | |
318 | if (rc < 0) | |
319 | goto out; | |
320 | ||
321 | ret++; | |
322 | start += XCOPY_SEGMENT_DESC_LEN; | |
323 | desc += XCOPY_SEGMENT_DESC_LEN; | |
324 | break; | |
325 | default: | |
6774def6 | 326 | pr_err("XCOPY unsupported segment descriptor" |
cbf031f4 NB |
327 | "type: 0x%02x\n", desc[0]); |
328 | goto out; | |
329 | } | |
330 | } | |
331 | ||
332 | return ret; | |
333 | ||
334 | out: | |
335 | return -EINVAL; | |
336 | } | |
337 | ||
338 | /* | |
339 | * Start xcopy_pt ops | |
340 | */ | |
341 | ||
342 | struct xcopy_pt_cmd { | |
343 | bool remote_port; | |
344 | struct se_cmd se_cmd; | |
345 | struct xcopy_op *xcopy_op; | |
346 | struct completion xpt_passthrough_sem; | |
366bda19 | 347 | unsigned char sense_buffer[TRANSPORT_SENSE_BUFFER]; |
cbf031f4 NB |
348 | }; |
349 | ||
adf653f9 | 350 | struct se_portal_group xcopy_pt_tpg; |
cbf031f4 NB |
351 | static struct se_session xcopy_pt_sess; |
352 | static struct se_node_acl xcopy_pt_nacl; | |
353 | ||
354 | static char *xcopy_pt_get_fabric_name(void) | |
355 | { | |
356 | return "xcopy-pt"; | |
357 | } | |
358 | ||
cbf031f4 NB |
359 | static int xcopy_pt_get_cmd_state(struct se_cmd *se_cmd) |
360 | { | |
361 | return 0; | |
362 | } | |
363 | ||
364 | static void xcopy_pt_undepend_remotedev(struct xcopy_op *xop) | |
365 | { | |
cbf031f4 NB |
366 | struct se_device *remote_dev; |
367 | ||
368 | if (xop->op_origin == XCOL_SOURCE_RECV_OP) | |
369 | remote_dev = xop->dst_dev; | |
370 | else | |
371 | remote_dev = xop->src_dev; | |
372 | ||
d588cf8f | 373 | pr_debug("Calling configfs_undepend_item for" |
cbf031f4 | 374 | " remote_dev: %p remote_dev->dev_group: %p\n", |
d588cf8f | 375 | remote_dev, &remote_dev->dev_group.cg_item); |
cbf031f4 | 376 | |
d588cf8f | 377 | target_undepend_item(&remote_dev->dev_group.cg_item); |
cbf031f4 NB |
378 | } |
379 | ||
380 | static void xcopy_pt_release_cmd(struct se_cmd *se_cmd) | |
381 | { | |
382 | struct xcopy_pt_cmd *xpt_cmd = container_of(se_cmd, | |
383 | struct xcopy_pt_cmd, se_cmd); | |
384 | ||
cbf031f4 NB |
385 | kfree(xpt_cmd); |
386 | } | |
387 | ||
388 | static int xcopy_pt_check_stop_free(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 | ||
393 | complete(&xpt_cmd->xpt_passthrough_sem); | |
394 | return 0; | |
395 | } | |
396 | ||
397 | static int xcopy_pt_write_pending(struct se_cmd *se_cmd) | |
398 | { | |
399 | return 0; | |
400 | } | |
401 | ||
402 | static int xcopy_pt_write_pending_status(struct se_cmd *se_cmd) | |
403 | { | |
404 | return 0; | |
405 | } | |
406 | ||
407 | static int xcopy_pt_queue_data_in(struct se_cmd *se_cmd) | |
408 | { | |
409 | return 0; | |
410 | } | |
411 | ||
412 | static int xcopy_pt_queue_status(struct se_cmd *se_cmd) | |
413 | { | |
414 | return 0; | |
415 | } | |
416 | ||
9ac8928e | 417 | static const struct target_core_fabric_ops xcopy_pt_tfo = { |
cbf031f4 | 418 | .get_fabric_name = xcopy_pt_get_fabric_name, |
cbf031f4 NB |
419 | .get_cmd_state = xcopy_pt_get_cmd_state, |
420 | .release_cmd = xcopy_pt_release_cmd, | |
421 | .check_stop_free = xcopy_pt_check_stop_free, | |
422 | .write_pending = xcopy_pt_write_pending, | |
423 | .write_pending_status = xcopy_pt_write_pending_status, | |
424 | .queue_data_in = xcopy_pt_queue_data_in, | |
425 | .queue_status = xcopy_pt_queue_status, | |
426 | }; | |
427 | ||
428 | /* | |
429 | * End xcopy_pt_ops | |
430 | */ | |
431 | ||
432 | int target_xcopy_setup_pt(void) | |
433 | { | |
434 | xcopy_wq = alloc_workqueue("xcopy_wq", WQ_MEM_RECLAIM, 0); | |
435 | if (!xcopy_wq) { | |
436 | pr_err("Unable to allocate xcopy_wq\n"); | |
437 | return -ENOMEM; | |
438 | } | |
439 | ||
cbf031f4 NB |
440 | memset(&xcopy_pt_tpg, 0, sizeof(struct se_portal_group)); |
441 | INIT_LIST_HEAD(&xcopy_pt_tpg.se_tpg_node); | |
442 | INIT_LIST_HEAD(&xcopy_pt_tpg.acl_node_list); | |
443 | INIT_LIST_HEAD(&xcopy_pt_tpg.tpg_sess_list); | |
444 | ||
cbf031f4 NB |
445 | xcopy_pt_tpg.se_tpg_tfo = &xcopy_pt_tfo; |
446 | ||
447 | memset(&xcopy_pt_nacl, 0, sizeof(struct se_node_acl)); | |
448 | INIT_LIST_HEAD(&xcopy_pt_nacl.acl_list); | |
449 | INIT_LIST_HEAD(&xcopy_pt_nacl.acl_sess_list); | |
450 | memset(&xcopy_pt_sess, 0, sizeof(struct se_session)); | |
451 | INIT_LIST_HEAD(&xcopy_pt_sess.sess_list); | |
452 | INIT_LIST_HEAD(&xcopy_pt_sess.sess_acl_list); | |
453 | ||
454 | xcopy_pt_nacl.se_tpg = &xcopy_pt_tpg; | |
455 | xcopy_pt_nacl.nacl_sess = &xcopy_pt_sess; | |
456 | ||
457 | xcopy_pt_sess.se_tpg = &xcopy_pt_tpg; | |
458 | xcopy_pt_sess.se_node_acl = &xcopy_pt_nacl; | |
459 | ||
460 | return 0; | |
461 | } | |
462 | ||
463 | void target_xcopy_release_pt(void) | |
464 | { | |
465 | if (xcopy_wq) | |
466 | destroy_workqueue(xcopy_wq); | |
467 | } | |
468 | ||
469 | static void target_xcopy_setup_pt_port( | |
470 | struct xcopy_pt_cmd *xpt_cmd, | |
471 | struct xcopy_op *xop, | |
472 | bool remote_port) | |
473 | { | |
474 | struct se_cmd *ec_cmd = xop->xop_se_cmd; | |
475 | struct se_cmd *pt_cmd = &xpt_cmd->se_cmd; | |
476 | ||
477 | if (xop->op_origin == XCOL_SOURCE_RECV_OP) { | |
478 | /* | |
479 | * Honor destination port reservations for X-COPY PUSH emulation | |
480 | * when CDB is received on local source port, and READs blocks to | |
481 | * WRITE on remote destination port. | |
482 | */ | |
483 | if (remote_port) { | |
484 | xpt_cmd->remote_port = remote_port; | |
cbf031f4 NB |
485 | } else { |
486 | pt_cmd->se_lun = ec_cmd->se_lun; | |
487 | pt_cmd->se_dev = ec_cmd->se_dev; | |
488 | ||
489 | pr_debug("Honoring local SRC port from ec_cmd->se_dev:" | |
490 | " %p\n", pt_cmd->se_dev); | |
491 | pt_cmd->se_lun = ec_cmd->se_lun; | |
492 | pr_debug("Honoring local SRC port from ec_cmd->se_lun: %p\n", | |
493 | pt_cmd->se_lun); | |
494 | } | |
495 | } else { | |
496 | /* | |
497 | * Honor source port reservation for X-COPY PULL emulation | |
498 | * when CDB is received on local desintation port, and READs | |
499 | * blocks from the remote source port to WRITE on local | |
500 | * destination port. | |
501 | */ | |
502 | if (remote_port) { | |
503 | xpt_cmd->remote_port = remote_port; | |
cbf031f4 NB |
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 DST 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 DST port from ec_cmd->se_lun: %p\n", | |
512 | pt_cmd->se_lun); | |
513 | } | |
514 | } | |
515 | } | |
516 | ||
2c336e3a CH |
517 | static void target_xcopy_init_pt_lun(struct se_device *se_dev, |
518 | struct se_cmd *pt_cmd, bool remote_port) | |
cbf031f4 NB |
519 | { |
520 | /* | |
521 | * Don't allocate + init an pt_cmd->se_lun if honoring local port for | |
522 | * reservations. The pt_cmd->se_lun pointer will be setup from within | |
523 | * target_xcopy_setup_pt_port() | |
524 | */ | |
2c336e3a CH |
525 | if (remote_port) { |
526 | pr_debug("Setup emulated se_dev: %p from se_dev\n", | |
527 | pt_cmd->se_dev); | |
528 | pt_cmd->se_lun = &se_dev->xcopy_lun; | |
529 | pt_cmd->se_dev = se_dev; | |
cbf031f4 NB |
530 | } |
531 | ||
c3d0a7c2 | 532 | pt_cmd->se_cmd_flags |= SCF_SE_LUN_CMD; |
cbf031f4 NB |
533 | } |
534 | ||
535 | static int target_xcopy_setup_pt_cmd( | |
536 | struct xcopy_pt_cmd *xpt_cmd, | |
537 | struct xcopy_op *xop, | |
538 | struct se_device *se_dev, | |
539 | unsigned char *cdb, | |
540 | bool remote_port, | |
541 | bool alloc_mem) | |
542 | { | |
543 | struct se_cmd *cmd = &xpt_cmd->se_cmd; | |
544 | sense_reason_t sense_rc; | |
545 | int ret = 0, rc; | |
546 | /* | |
547 | * Setup LUN+port to honor reservations based upon xop->op_origin for | |
548 | * X-COPY PUSH or X-COPY PULL based upon where the CDB was received. | |
549 | */ | |
2c336e3a CH |
550 | target_xcopy_init_pt_lun(se_dev, cmd, remote_port); |
551 | ||
cbf031f4 NB |
552 | xpt_cmd->xcopy_op = xop; |
553 | target_xcopy_setup_pt_port(xpt_cmd, xop, remote_port); | |
554 | ||
649ee054 | 555 | cmd->tag = 0; |
cbf031f4 NB |
556 | sense_rc = target_setup_cmd_from_cdb(cmd, cdb); |
557 | if (sense_rc) { | |
558 | ret = -EINVAL; | |
559 | goto out; | |
560 | } | |
561 | ||
562 | if (alloc_mem) { | |
563 | rc = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents, | |
564 | cmd->data_length, false); | |
565 | if (rc < 0) { | |
566 | ret = rc; | |
567 | goto out; | |
568 | } | |
569 | /* | |
570 | * Set this bit so that transport_free_pages() allows the | |
571 | * caller to release SGLs + physical memory allocated by | |
572 | * transport_generic_get_mem().. | |
573 | */ | |
574 | cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC; | |
575 | } else { | |
576 | /* | |
577 | * Here the previously allocated SGLs for the internal READ | |
578 | * are mapped zero-copy to the internal WRITE. | |
579 | */ | |
580 | sense_rc = transport_generic_map_mem_to_cmd(cmd, | |
581 | xop->xop_data_sg, xop->xop_data_nents, | |
582 | NULL, 0); | |
583 | if (sense_rc) { | |
584 | ret = -EINVAL; | |
585 | goto out; | |
586 | } | |
587 | ||
588 | pr_debug("Setup PASSTHROUGH_NOALLOC t_data_sg: %p t_data_nents:" | |
589 | " %u\n", cmd->t_data_sg, cmd->t_data_nents); | |
590 | } | |
591 | ||
592 | return 0; | |
593 | ||
594 | out: | |
cbf031f4 NB |
595 | return ret; |
596 | } | |
597 | ||
598 | static int target_xcopy_issue_pt_cmd(struct xcopy_pt_cmd *xpt_cmd) | |
599 | { | |
600 | struct se_cmd *se_cmd = &xpt_cmd->se_cmd; | |
601 | sense_reason_t sense_rc; | |
602 | ||
603 | sense_rc = transport_generic_new_cmd(se_cmd); | |
604 | if (sense_rc) | |
605 | return -EINVAL; | |
606 | ||
607 | if (se_cmd->data_direction == DMA_TO_DEVICE) | |
608 | target_execute_cmd(se_cmd); | |
609 | ||
610 | wait_for_completion_interruptible(&xpt_cmd->xpt_passthrough_sem); | |
611 | ||
612 | pr_debug("target_xcopy_issue_pt_cmd(): SCSI status: 0x%02x\n", | |
613 | se_cmd->scsi_status); | |
8a955d6d NB |
614 | |
615 | return (se_cmd->scsi_status) ? -EINVAL : 0; | |
cbf031f4 NB |
616 | } |
617 | ||
618 | static int target_xcopy_read_source( | |
619 | struct se_cmd *ec_cmd, | |
620 | struct xcopy_op *xop, | |
621 | struct se_device *src_dev, | |
622 | sector_t src_lba, | |
623 | u32 src_sectors) | |
624 | { | |
625 | struct xcopy_pt_cmd *xpt_cmd; | |
626 | struct se_cmd *se_cmd; | |
627 | u32 length = (src_sectors * src_dev->dev_attrib.block_size); | |
628 | int rc; | |
629 | unsigned char cdb[16]; | |
630 | bool remote_port = (xop->op_origin == XCOL_DEST_RECV_OP); | |
631 | ||
632 | xpt_cmd = kzalloc(sizeof(struct xcopy_pt_cmd), GFP_KERNEL); | |
633 | if (!xpt_cmd) { | |
634 | pr_err("Unable to allocate xcopy_pt_cmd\n"); | |
635 | return -ENOMEM; | |
636 | } | |
637 | init_completion(&xpt_cmd->xpt_passthrough_sem); | |
638 | se_cmd = &xpt_cmd->se_cmd; | |
639 | ||
640 | memset(&cdb[0], 0, 16); | |
641 | cdb[0] = READ_16; | |
642 | put_unaligned_be64(src_lba, &cdb[2]); | |
643 | put_unaligned_be32(src_sectors, &cdb[10]); | |
644 | pr_debug("XCOPY: Built READ_16: LBA: %llu Sectors: %u Length: %u\n", | |
645 | (unsigned long long)src_lba, src_sectors, length); | |
646 | ||
647 | transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, NULL, length, | |
366bda19 | 648 | DMA_FROM_DEVICE, 0, &xpt_cmd->sense_buffer[0]); |
cbf031f4 NB |
649 | xop->src_pt_cmd = xpt_cmd; |
650 | ||
651 | rc = target_xcopy_setup_pt_cmd(xpt_cmd, xop, src_dev, &cdb[0], | |
652 | remote_port, true); | |
653 | if (rc < 0) { | |
654 | transport_generic_free_cmd(se_cmd, 0); | |
655 | return rc; | |
656 | } | |
657 | ||
658 | xop->xop_data_sg = se_cmd->t_data_sg; | |
659 | xop->xop_data_nents = se_cmd->t_data_nents; | |
660 | pr_debug("XCOPY-READ: Saved xop->xop_data_sg: %p, num: %u for READ" | |
661 | " memory\n", xop->xop_data_sg, xop->xop_data_nents); | |
662 | ||
663 | rc = target_xcopy_issue_pt_cmd(xpt_cmd); | |
664 | if (rc < 0) { | |
665 | transport_generic_free_cmd(se_cmd, 0); | |
666 | return rc; | |
667 | } | |
668 | /* | |
669 | * Clear off the allocated t_data_sg, that has been saved for | |
670 | * zero-copy WRITE submission reuse in struct xcopy_op.. | |
671 | */ | |
672 | se_cmd->t_data_sg = NULL; | |
673 | se_cmd->t_data_nents = 0; | |
674 | ||
675 | return 0; | |
676 | } | |
677 | ||
678 | static int target_xcopy_write_destination( | |
679 | struct se_cmd *ec_cmd, | |
680 | struct xcopy_op *xop, | |
681 | struct se_device *dst_dev, | |
682 | sector_t dst_lba, | |
683 | u32 dst_sectors) | |
684 | { | |
685 | struct xcopy_pt_cmd *xpt_cmd; | |
686 | struct se_cmd *se_cmd; | |
687 | u32 length = (dst_sectors * dst_dev->dev_attrib.block_size); | |
688 | int rc; | |
689 | unsigned char cdb[16]; | |
690 | bool remote_port = (xop->op_origin == XCOL_SOURCE_RECV_OP); | |
691 | ||
692 | xpt_cmd = kzalloc(sizeof(struct xcopy_pt_cmd), GFP_KERNEL); | |
693 | if (!xpt_cmd) { | |
694 | pr_err("Unable to allocate xcopy_pt_cmd\n"); | |
695 | return -ENOMEM; | |
696 | } | |
697 | init_completion(&xpt_cmd->xpt_passthrough_sem); | |
698 | se_cmd = &xpt_cmd->se_cmd; | |
699 | ||
700 | memset(&cdb[0], 0, 16); | |
701 | cdb[0] = WRITE_16; | |
702 | put_unaligned_be64(dst_lba, &cdb[2]); | |
703 | put_unaligned_be32(dst_sectors, &cdb[10]); | |
704 | pr_debug("XCOPY: Built WRITE_16: LBA: %llu Sectors: %u Length: %u\n", | |
705 | (unsigned long long)dst_lba, dst_sectors, length); | |
706 | ||
707 | transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, NULL, length, | |
366bda19 | 708 | DMA_TO_DEVICE, 0, &xpt_cmd->sense_buffer[0]); |
cbf031f4 NB |
709 | xop->dst_pt_cmd = xpt_cmd; |
710 | ||
711 | rc = target_xcopy_setup_pt_cmd(xpt_cmd, xop, dst_dev, &cdb[0], | |
712 | remote_port, false); | |
713 | if (rc < 0) { | |
714 | struct se_cmd *src_cmd = &xop->src_pt_cmd->se_cmd; | |
715 | /* | |
716 | * If the failure happened before the t_mem_list hand-off in | |
717 | * target_xcopy_setup_pt_cmd(), Reset memory + clear flag so that | |
718 | * core releases this memory on error during X-COPY WRITE I/O. | |
719 | */ | |
720 | src_cmd->se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC; | |
721 | src_cmd->t_data_sg = xop->xop_data_sg; | |
722 | src_cmd->t_data_nents = xop->xop_data_nents; | |
723 | ||
724 | transport_generic_free_cmd(se_cmd, 0); | |
725 | return rc; | |
726 | } | |
727 | ||
728 | rc = target_xcopy_issue_pt_cmd(xpt_cmd); | |
729 | if (rc < 0) { | |
730 | se_cmd->se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC; | |
731 | transport_generic_free_cmd(se_cmd, 0); | |
732 | return rc; | |
733 | } | |
734 | ||
735 | return 0; | |
736 | } | |
737 | ||
738 | static void target_xcopy_do_work(struct work_struct *work) | |
739 | { | |
740 | struct xcopy_op *xop = container_of(work, struct xcopy_op, xop_work); | |
741 | struct se_device *src_dev = xop->src_dev, *dst_dev = xop->dst_dev; | |
742 | struct se_cmd *ec_cmd = xop->xop_se_cmd; | |
743 | sector_t src_lba = xop->src_lba, dst_lba = xop->dst_lba, end_lba; | |
744 | unsigned int max_sectors; | |
745 | int rc; | |
746 | unsigned short nolb = xop->nolb, cur_nolb, max_nolb, copied_nolb = 0; | |
747 | ||
748 | end_lba = src_lba + nolb; | |
749 | /* | |
750 | * Break up XCOPY I/O into hw_max_sectors sized I/O based on the | |
751 | * smallest max_sectors between src_dev + dev_dev, or | |
752 | */ | |
753 | max_sectors = min(src_dev->dev_attrib.hw_max_sectors, | |
754 | dst_dev->dev_attrib.hw_max_sectors); | |
755 | max_sectors = min_t(u32, max_sectors, XCOPY_MAX_SECTORS); | |
756 | ||
757 | max_nolb = min_t(u16, max_sectors, ((u16)(~0U))); | |
758 | ||
759 | pr_debug("target_xcopy_do_work: nolb: %hu, max_nolb: %hu end_lba: %llu\n", | |
760 | nolb, max_nolb, (unsigned long long)end_lba); | |
761 | pr_debug("target_xcopy_do_work: Starting src_lba: %llu, dst_lba: %llu\n", | |
762 | (unsigned long long)src_lba, (unsigned long long)dst_lba); | |
763 | ||
764 | while (src_lba < end_lba) { | |
765 | cur_nolb = min(nolb, max_nolb); | |
766 | ||
767 | pr_debug("target_xcopy_do_work: Calling read src_dev: %p src_lba: %llu," | |
768 | " cur_nolb: %hu\n", src_dev, (unsigned long long)src_lba, cur_nolb); | |
769 | ||
770 | rc = target_xcopy_read_source(ec_cmd, xop, src_dev, src_lba, cur_nolb); | |
771 | if (rc < 0) | |
772 | goto out; | |
773 | ||
774 | src_lba += cur_nolb; | |
775 | pr_debug("target_xcopy_do_work: Incremented READ src_lba to %llu\n", | |
776 | (unsigned long long)src_lba); | |
777 | ||
778 | pr_debug("target_xcopy_do_work: Calling write dst_dev: %p dst_lba: %llu," | |
779 | " cur_nolb: %hu\n", dst_dev, (unsigned long long)dst_lba, cur_nolb); | |
780 | ||
781 | rc = target_xcopy_write_destination(ec_cmd, xop, dst_dev, | |
782 | dst_lba, cur_nolb); | |
783 | if (rc < 0) { | |
784 | transport_generic_free_cmd(&xop->src_pt_cmd->se_cmd, 0); | |
785 | goto out; | |
786 | } | |
787 | ||
788 | dst_lba += cur_nolb; | |
789 | pr_debug("target_xcopy_do_work: Incremented WRITE dst_lba to %llu\n", | |
790 | (unsigned long long)dst_lba); | |
791 | ||
792 | copied_nolb += cur_nolb; | |
793 | nolb -= cur_nolb; | |
794 | ||
795 | transport_generic_free_cmd(&xop->src_pt_cmd->se_cmd, 0); | |
796 | xop->dst_pt_cmd->se_cmd.se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC; | |
797 | ||
798 | transport_generic_free_cmd(&xop->dst_pt_cmd->se_cmd, 0); | |
799 | } | |
800 | ||
801 | xcopy_pt_undepend_remotedev(xop); | |
802 | kfree(xop); | |
803 | ||
804 | pr_debug("target_xcopy_do_work: Final src_lba: %llu, dst_lba: %llu\n", | |
805 | (unsigned long long)src_lba, (unsigned long long)dst_lba); | |
806 | pr_debug("target_xcopy_do_work: Blocks copied: %hu, Bytes Copied: %u\n", | |
807 | copied_nolb, copied_nolb * dst_dev->dev_attrib.block_size); | |
808 | ||
809 | pr_debug("target_xcopy_do_work: Setting X-COPY GOOD status -> sending response\n"); | |
810 | target_complete_cmd(ec_cmd, SAM_STAT_GOOD); | |
811 | return; | |
812 | ||
813 | out: | |
814 | xcopy_pt_undepend_remotedev(xop); | |
815 | kfree(xop); | |
816 | ||
817 | pr_warn("target_xcopy_do_work: Setting X-COPY CHECK_CONDITION -> sending response\n"); | |
818 | ec_cmd->scsi_status = SAM_STAT_CHECK_CONDITION; | |
819 | target_complete_cmd(ec_cmd, SAM_STAT_CHECK_CONDITION); | |
820 | } | |
821 | ||
822 | sense_reason_t target_do_xcopy(struct se_cmd *se_cmd) | |
823 | { | |
acb3f260 | 824 | struct se_device *dev = se_cmd->se_dev; |
cbf031f4 NB |
825 | struct xcopy_op *xop = NULL; |
826 | unsigned char *p = NULL, *seg_desc; | |
827 | unsigned int list_id, list_id_usage, sdll, inline_dl, sa; | |
48502ddb | 828 | sense_reason_t ret = TCM_INVALID_PARAMETER_LIST; |
cbf031f4 NB |
829 | int rc; |
830 | unsigned short tdll; | |
831 | ||
acb3f260 NB |
832 | if (!dev->dev_attrib.emulate_3pc) { |
833 | pr_err("EXTENDED_COPY operation explicitly disabled\n"); | |
834 | return TCM_UNSUPPORTED_SCSI_OPCODE; | |
835 | } | |
836 | ||
cbf031f4 NB |
837 | sa = se_cmd->t_task_cdb[1] & 0x1f; |
838 | if (sa != 0x00) { | |
839 | pr_err("EXTENDED_COPY(LID4) not supported\n"); | |
840 | return TCM_UNSUPPORTED_SCSI_OPCODE; | |
841 | } | |
842 | ||
934a138e NB |
843 | xop = kzalloc(sizeof(struct xcopy_op), GFP_KERNEL); |
844 | if (!xop) { | |
845 | pr_err("Unable to allocate xcopy_op\n"); | |
846 | return TCM_OUT_OF_RESOURCES; | |
847 | } | |
848 | xop->xop_se_cmd = se_cmd; | |
849 | ||
cbf031f4 NB |
850 | p = transport_kmap_data_sg(se_cmd); |
851 | if (!p) { | |
852 | pr_err("transport_kmap_data_sg() failed in target_do_xcopy\n"); | |
934a138e | 853 | kfree(xop); |
cbf031f4 NB |
854 | return TCM_OUT_OF_RESOURCES; |
855 | } | |
856 | ||
857 | list_id = p[0]; | |
3f7a46c6 NB |
858 | list_id_usage = (p[1] & 0x18) >> 3; |
859 | ||
cbf031f4 NB |
860 | /* |
861 | * Determine TARGET DESCRIPTOR LIST LENGTH + SEGMENT DESCRIPTOR LIST LENGTH | |
862 | */ | |
863 | tdll = get_unaligned_be16(&p[2]); | |
864 | sdll = get_unaligned_be32(&p[8]); | |
865 | ||
866 | inline_dl = get_unaligned_be32(&p[12]); | |
867 | if (inline_dl != 0) { | |
868 | pr_err("XCOPY with non zero inline data length\n"); | |
869 | goto out; | |
870 | } | |
871 | ||
cbf031f4 NB |
872 | pr_debug("Processing XCOPY with list_id: 0x%02x list_id_usage: 0x%02x" |
873 | " tdll: %hu sdll: %u inline_dl: %u\n", list_id, list_id_usage, | |
874 | tdll, sdll, inline_dl); | |
875 | ||
876 | rc = target_xcopy_parse_target_descriptors(se_cmd, xop, &p[16], tdll); | |
877 | if (rc <= 0) | |
878 | goto out; | |
879 | ||
48502ddb NB |
880 | if (xop->src_dev->dev_attrib.block_size != |
881 | xop->dst_dev->dev_attrib.block_size) { | |
882 | pr_err("XCOPY: Non matching src_dev block_size: %u + dst_dev" | |
883 | " block_size: %u currently unsupported\n", | |
884 | xop->src_dev->dev_attrib.block_size, | |
885 | xop->dst_dev->dev_attrib.block_size); | |
886 | xcopy_pt_undepend_remotedev(xop); | |
887 | ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
888 | goto out; | |
889 | } | |
890 | ||
cbf031f4 NB |
891 | pr_debug("XCOPY: Processed %d target descriptors, length: %u\n", rc, |
892 | rc * XCOPY_TARGET_DESC_LEN); | |
893 | seg_desc = &p[16]; | |
894 | seg_desc += (rc * XCOPY_TARGET_DESC_LEN); | |
895 | ||
896 | rc = target_xcopy_parse_segment_descriptors(se_cmd, xop, seg_desc, sdll); | |
897 | if (rc <= 0) { | |
898 | xcopy_pt_undepend_remotedev(xop); | |
899 | goto out; | |
900 | } | |
901 | transport_kunmap_data_sg(se_cmd); | |
902 | ||
903 | pr_debug("XCOPY: Processed %d segment descriptors, length: %u\n", rc, | |
904 | rc * XCOPY_SEGMENT_DESC_LEN); | |
905 | INIT_WORK(&xop->xop_work, target_xcopy_do_work); | |
906 | queue_work(xcopy_wq, &xop->xop_work); | |
907 | return TCM_NO_SENSE; | |
908 | ||
909 | out: | |
910 | if (p) | |
911 | transport_kunmap_data_sg(se_cmd); | |
912 | kfree(xop); | |
48502ddb | 913 | return ret; |
cbf031f4 NB |
914 | } |
915 | ||
916 | static sense_reason_t target_rcr_operating_parameters(struct se_cmd *se_cmd) | |
917 | { | |
918 | unsigned char *p; | |
919 | ||
920 | p = transport_kmap_data_sg(se_cmd); | |
921 | if (!p) { | |
922 | pr_err("transport_kmap_data_sg failed in" | |
923 | " target_rcr_operating_parameters\n"); | |
924 | return TCM_OUT_OF_RESOURCES; | |
925 | } | |
926 | ||
927 | if (se_cmd->data_length < 54) { | |
928 | pr_err("Receive Copy Results Op Parameters length" | |
929 | " too small: %u\n", se_cmd->data_length); | |
930 | transport_kunmap_data_sg(se_cmd); | |
931 | return TCM_INVALID_CDB_FIELD; | |
932 | } | |
933 | /* | |
934 | * Set SNLID=1 (Supports no List ID) | |
935 | */ | |
936 | p[4] = 0x1; | |
937 | /* | |
938 | * MAXIMUM TARGET DESCRIPTOR COUNT | |
939 | */ | |
940 | put_unaligned_be16(RCR_OP_MAX_TARGET_DESC_COUNT, &p[8]); | |
941 | /* | |
942 | * MAXIMUM SEGMENT DESCRIPTOR COUNT | |
943 | */ | |
944 | put_unaligned_be16(RCR_OP_MAX_SG_DESC_COUNT, &p[10]); | |
945 | /* | |
946 | * MAXIMUM DESCRIPTOR LIST LENGTH | |
947 | */ | |
948 | put_unaligned_be32(RCR_OP_MAX_DESC_LIST_LEN, &p[12]); | |
949 | /* | |
950 | * MAXIMUM SEGMENT LENGTH | |
951 | */ | |
952 | put_unaligned_be32(RCR_OP_MAX_SEGMENT_LEN, &p[16]); | |
953 | /* | |
954 | * MAXIMUM INLINE DATA LENGTH for SA 0x04 (NOT SUPPORTED) | |
955 | */ | |
956 | put_unaligned_be32(0x0, &p[20]); | |
957 | /* | |
958 | * HELD DATA LIMIT | |
959 | */ | |
960 | put_unaligned_be32(0x0, &p[24]); | |
961 | /* | |
962 | * MAXIMUM STREAM DEVICE TRANSFER SIZE | |
963 | */ | |
964 | put_unaligned_be32(0x0, &p[28]); | |
965 | /* | |
966 | * TOTAL CONCURRENT COPIES | |
967 | */ | |
968 | put_unaligned_be16(RCR_OP_TOTAL_CONCURR_COPIES, &p[34]); | |
969 | /* | |
970 | * MAXIMUM CONCURRENT COPIES | |
971 | */ | |
972 | p[36] = RCR_OP_MAX_CONCURR_COPIES; | |
973 | /* | |
974 | * DATA SEGMENT GRANULARITY (log 2) | |
975 | */ | |
976 | p[37] = RCR_OP_DATA_SEG_GRAN_LOG2; | |
977 | /* | |
978 | * INLINE DATA GRANULARITY log 2) | |
979 | */ | |
980 | p[38] = RCR_OP_INLINE_DATA_GRAN_LOG2; | |
981 | /* | |
982 | * HELD DATA GRANULARITY | |
983 | */ | |
984 | p[39] = RCR_OP_HELD_DATA_GRAN_LOG2; | |
985 | /* | |
986 | * IMPLEMENTED DESCRIPTOR LIST LENGTH | |
987 | */ | |
988 | p[43] = 0x2; | |
989 | /* | |
990 | * List of implemented descriptor type codes (ordered) | |
991 | */ | |
992 | p[44] = 0x02; /* Copy Block to Block device */ | |
993 | p[45] = 0xe4; /* Identification descriptor target descriptor */ | |
994 | ||
995 | /* | |
996 | * AVAILABLE DATA (n-3) | |
997 | */ | |
998 | put_unaligned_be32(42, &p[0]); | |
999 | ||
1000 | transport_kunmap_data_sg(se_cmd); | |
1001 | target_complete_cmd(se_cmd, GOOD); | |
1002 | ||
1003 | return TCM_NO_SENSE; | |
1004 | } | |
1005 | ||
1006 | sense_reason_t target_do_receive_copy_results(struct se_cmd *se_cmd) | |
1007 | { | |
1008 | unsigned char *cdb = &se_cmd->t_task_cdb[0]; | |
1009 | int sa = (cdb[1] & 0x1f), list_id = cdb[2]; | |
1010 | sense_reason_t rc = TCM_NO_SENSE; | |
1011 | ||
1012 | pr_debug("Entering target_do_receive_copy_results: SA: 0x%02x, List ID:" | |
1013 | " 0x%02x, AL: %u\n", sa, list_id, se_cmd->data_length); | |
1014 | ||
1015 | if (list_id != 0) { | |
1016 | pr_err("Receive Copy Results with non zero list identifier" | |
1017 | " not supported\n"); | |
1018 | return TCM_INVALID_CDB_FIELD; | |
1019 | } | |
1020 | ||
1021 | switch (sa) { | |
1022 | case RCR_SA_OPERATING_PARAMETERS: | |
1023 | rc = target_rcr_operating_parameters(se_cmd); | |
1024 | break; | |
1025 | case RCR_SA_COPY_STATUS: | |
1026 | case RCR_SA_RECEIVE_DATA: | |
1027 | case RCR_SA_FAILED_SEGMENT_DETAILS: | |
1028 | default: | |
1029 | pr_err("Unsupported SA for receive copy results: 0x%02x\n", sa); | |
1030 | return TCM_INVALID_CDB_FIELD; | |
1031 | } | |
1032 | ||
1033 | return rc; | |
1034 | } |