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