Commit | Line | Data |
---|---|---|
d6e0175c CH |
1 | /* |
2 | * SCSI Block Commands (SBC) parsing and emulation. | |
3 | * | |
4c76251e | 4 | * (c) Copyright 2002-2013 Datera, Inc. |
d6e0175c CH |
5 | * |
6 | * Nicholas A. Bellinger <nab@kernel.org> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2 of the License, or | |
11 | * (at your option) any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
21 | */ | |
22 | ||
23 | #include <linux/kernel.h> | |
24 | #include <linux/module.h> | |
25 | #include <linux/ratelimit.h> | |
41861fa8 | 26 | #include <linux/crc-t10dif.h> |
d6e0175c CH |
27 | #include <asm/unaligned.h> |
28 | #include <scsi/scsi.h> | |
68ff9b9b | 29 | #include <scsi/scsi_tcq.h> |
d6e0175c CH |
30 | |
31 | #include <target/target_core_base.h> | |
32 | #include <target/target_core_backend.h> | |
33 | #include <target/target_core_fabric.h> | |
34 | ||
35 | #include "target_core_internal.h" | |
36 | #include "target_core_ua.h" | |
c66094bf | 37 | #include "target_core_alua.h" |
d6e0175c | 38 | |
de103c93 CH |
39 | static sense_reason_t |
40 | sbc_emulate_readcapacity(struct se_cmd *cmd) | |
1fd032ee CH |
41 | { |
42 | struct se_device *dev = cmd->se_dev; | |
8dc8632a | 43 | unsigned char *cdb = cmd->t_task_cdb; |
1fd032ee | 44 | unsigned long long blocks_long = dev->transport->get_blocks(dev); |
a50da144 PB |
45 | unsigned char *rbuf; |
46 | unsigned char buf[8]; | |
1fd032ee CH |
47 | u32 blocks; |
48 | ||
8dc8632a RD |
49 | /* |
50 | * SBC-2 says: | |
51 | * If the PMI bit is set to zero and the LOGICAL BLOCK | |
52 | * ADDRESS field is not set to zero, the device server shall | |
53 | * terminate the command with CHECK CONDITION status with | |
54 | * the sense key set to ILLEGAL REQUEST and the additional | |
55 | * sense code set to INVALID FIELD IN CDB. | |
56 | * | |
57 | * In SBC-3, these fields are obsolete, but some SCSI | |
58 | * compliance tests actually check this, so we might as well | |
59 | * follow SBC-2. | |
60 | */ | |
61 | if (!(cdb[8] & 1) && !!(cdb[2] | cdb[3] | cdb[4] | cdb[5])) | |
62 | return TCM_INVALID_CDB_FIELD; | |
63 | ||
1fd032ee CH |
64 | if (blocks_long >= 0x00000000ffffffff) |
65 | blocks = 0xffffffff; | |
66 | else | |
67 | blocks = (u32)blocks_long; | |
68 | ||
1fd032ee CH |
69 | buf[0] = (blocks >> 24) & 0xff; |
70 | buf[1] = (blocks >> 16) & 0xff; | |
71 | buf[2] = (blocks >> 8) & 0xff; | |
72 | buf[3] = blocks & 0xff; | |
0fd97ccf CH |
73 | buf[4] = (dev->dev_attrib.block_size >> 24) & 0xff; |
74 | buf[5] = (dev->dev_attrib.block_size >> 16) & 0xff; | |
75 | buf[6] = (dev->dev_attrib.block_size >> 8) & 0xff; | |
76 | buf[7] = dev->dev_attrib.block_size & 0xff; | |
1fd032ee | 77 | |
a50da144 | 78 | rbuf = transport_kmap_data_sg(cmd); |
8b4b0dcb NB |
79 | if (rbuf) { |
80 | memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length)); | |
81 | transport_kunmap_data_sg(cmd); | |
82 | } | |
1fd032ee CH |
83 | |
84 | target_complete_cmd(cmd, GOOD); | |
85 | return 0; | |
86 | } | |
87 | ||
de103c93 CH |
88 | static sense_reason_t |
89 | sbc_emulate_readcapacity_16(struct se_cmd *cmd) | |
1fd032ee CH |
90 | { |
91 | struct se_device *dev = cmd->se_dev; | |
a50da144 PB |
92 | unsigned char *rbuf; |
93 | unsigned char buf[32]; | |
1fd032ee CH |
94 | unsigned long long blocks = dev->transport->get_blocks(dev); |
95 | ||
a50da144 | 96 | memset(buf, 0, sizeof(buf)); |
1fd032ee CH |
97 | buf[0] = (blocks >> 56) & 0xff; |
98 | buf[1] = (blocks >> 48) & 0xff; | |
99 | buf[2] = (blocks >> 40) & 0xff; | |
100 | buf[3] = (blocks >> 32) & 0xff; | |
101 | buf[4] = (blocks >> 24) & 0xff; | |
102 | buf[5] = (blocks >> 16) & 0xff; | |
103 | buf[6] = (blocks >> 8) & 0xff; | |
104 | buf[7] = blocks & 0xff; | |
0fd97ccf CH |
105 | buf[8] = (dev->dev_attrib.block_size >> 24) & 0xff; |
106 | buf[9] = (dev->dev_attrib.block_size >> 16) & 0xff; | |
107 | buf[10] = (dev->dev_attrib.block_size >> 8) & 0xff; | |
108 | buf[11] = dev->dev_attrib.block_size & 0xff; | |
7f7caf6a AG |
109 | |
110 | if (dev->transport->get_lbppbe) | |
111 | buf[13] = dev->transport->get_lbppbe(dev) & 0x0f; | |
112 | ||
113 | if (dev->transport->get_alignment_offset_lbas) { | |
114 | u16 lalba = dev->transport->get_alignment_offset_lbas(dev); | |
115 | buf[14] = (lalba >> 8) & 0x3f; | |
116 | buf[15] = lalba & 0xff; | |
117 | } | |
118 | ||
1fd032ee CH |
119 | /* |
120 | * Set Thin Provisioning Enable bit following sbc3r22 in section | |
121 | * READ CAPACITY (16) byte 14 if emulate_tpu or emulate_tpws is enabled. | |
122 | */ | |
0fd97ccf | 123 | if (dev->dev_attrib.emulate_tpu || dev->dev_attrib.emulate_tpws) |
7f7caf6a | 124 | buf[14] |= 0x80; |
1fd032ee | 125 | |
a50da144 | 126 | rbuf = transport_kmap_data_sg(cmd); |
8b4b0dcb NB |
127 | if (rbuf) { |
128 | memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length)); | |
129 | transport_kunmap_data_sg(cmd); | |
130 | } | |
1fd032ee CH |
131 | |
132 | target_complete_cmd(cmd, GOOD); | |
133 | return 0; | |
134 | } | |
135 | ||
972b29c8 | 136 | sector_t sbc_get_write_same_sectors(struct se_cmd *cmd) |
1fd032ee | 137 | { |
1fd032ee | 138 | u32 num_blocks; |
1fd032ee CH |
139 | |
140 | if (cmd->t_task_cdb[0] == WRITE_SAME) | |
141 | num_blocks = get_unaligned_be16(&cmd->t_task_cdb[7]); | |
142 | else if (cmd->t_task_cdb[0] == WRITE_SAME_16) | |
143 | num_blocks = get_unaligned_be32(&cmd->t_task_cdb[10]); | |
144 | else /* WRITE_SAME_32 via VARIABLE_LENGTH_CMD */ | |
145 | num_blocks = get_unaligned_be32(&cmd->t_task_cdb[28]); | |
146 | ||
147 | /* | |
148 | * Use the explicit range when non zero is supplied, otherwise calculate | |
149 | * the remaining range based on ->get_blocks() - starting LBA. | |
150 | */ | |
6f974e8c CH |
151 | if (num_blocks) |
152 | return num_blocks; | |
1fd032ee | 153 | |
6f974e8c CH |
154 | return cmd->se_dev->transport->get_blocks(cmd->se_dev) - |
155 | cmd->t_task_lba + 1; | |
1fd032ee | 156 | } |
972b29c8 | 157 | EXPORT_SYMBOL(sbc_get_write_same_sectors); |
1fd032ee | 158 | |
de103c93 | 159 | static sense_reason_t |
1920ed61 | 160 | sbc_emulate_noop(struct se_cmd *cmd) |
1a1ff38c BK |
161 | { |
162 | target_complete_cmd(cmd, GOOD); | |
163 | return 0; | |
164 | } | |
165 | ||
d6e0175c CH |
166 | static inline u32 sbc_get_size(struct se_cmd *cmd, u32 sectors) |
167 | { | |
0fd97ccf | 168 | return cmd->se_dev->dev_attrib.block_size * sectors; |
d6e0175c CH |
169 | } |
170 | ||
171 | static int sbc_check_valid_sectors(struct se_cmd *cmd) | |
172 | { | |
173 | struct se_device *dev = cmd->se_dev; | |
174 | unsigned long long end_lba; | |
175 | u32 sectors; | |
176 | ||
0fd97ccf | 177 | sectors = cmd->data_length / dev->dev_attrib.block_size; |
d6e0175c CH |
178 | end_lba = dev->transport->get_blocks(dev) + 1; |
179 | ||
180 | if (cmd->t_task_lba + sectors > end_lba) { | |
181 | pr_err("target: lba %llu, sectors %u exceeds end lba %llu\n", | |
182 | cmd->t_task_lba, sectors, end_lba); | |
183 | return -EINVAL; | |
184 | } | |
185 | ||
186 | return 0; | |
187 | } | |
188 | ||
189 | static inline u32 transport_get_sectors_6(unsigned char *cdb) | |
190 | { | |
191 | /* | |
192 | * Use 8-bit sector value. SBC-3 says: | |
193 | * | |
194 | * A TRANSFER LENGTH field set to zero specifies that 256 | |
195 | * logical blocks shall be written. Any other value | |
196 | * specifies the number of logical blocks that shall be | |
197 | * written. | |
198 | */ | |
199 | return cdb[4] ? : 256; | |
200 | } | |
201 | ||
202 | static inline u32 transport_get_sectors_10(unsigned char *cdb) | |
203 | { | |
204 | return (u32)(cdb[7] << 8) + cdb[8]; | |
205 | } | |
206 | ||
207 | static inline u32 transport_get_sectors_12(unsigned char *cdb) | |
208 | { | |
209 | return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9]; | |
210 | } | |
211 | ||
212 | static inline u32 transport_get_sectors_16(unsigned char *cdb) | |
213 | { | |
214 | return (u32)(cdb[10] << 24) + (cdb[11] << 16) + | |
215 | (cdb[12] << 8) + cdb[13]; | |
216 | } | |
217 | ||
218 | /* | |
219 | * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants | |
220 | */ | |
221 | static inline u32 transport_get_sectors_32(unsigned char *cdb) | |
222 | { | |
223 | return (u32)(cdb[28] << 24) + (cdb[29] << 16) + | |
224 | (cdb[30] << 8) + cdb[31]; | |
225 | ||
226 | } | |
227 | ||
228 | static inline u32 transport_lba_21(unsigned char *cdb) | |
229 | { | |
230 | return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3]; | |
231 | } | |
232 | ||
233 | static inline u32 transport_lba_32(unsigned char *cdb) | |
234 | { | |
235 | return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5]; | |
236 | } | |
237 | ||
238 | static inline unsigned long long transport_lba_64(unsigned char *cdb) | |
239 | { | |
240 | unsigned int __v1, __v2; | |
241 | ||
242 | __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5]; | |
243 | __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9]; | |
244 | ||
245 | return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; | |
246 | } | |
247 | ||
248 | /* | |
249 | * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs | |
250 | */ | |
251 | static inline unsigned long long transport_lba_64_ext(unsigned char *cdb) | |
252 | { | |
253 | unsigned int __v1, __v2; | |
254 | ||
255 | __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15]; | |
256 | __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19]; | |
257 | ||
258 | return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; | |
259 | } | |
260 | ||
cd063bef NB |
261 | static sense_reason_t |
262 | sbc_setup_write_same(struct se_cmd *cmd, unsigned char *flags, struct sbc_ops *ops) | |
d6e0175c | 263 | { |
972b29c8 | 264 | unsigned int sectors = sbc_get_write_same_sectors(cmd); |
773cbaf7 | 265 | |
d6e0175c CH |
266 | if ((flags[0] & 0x04) || (flags[0] & 0x02)) { |
267 | pr_err("WRITE_SAME PBDATA and LBDATA" | |
268 | " bits not supported for Block Discard" | |
269 | " Emulation\n"); | |
cd063bef | 270 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
d6e0175c | 271 | } |
773cbaf7 NB |
272 | if (sectors > cmd->se_dev->dev_attrib.max_write_same_len) { |
273 | pr_warn("WRITE_SAME sectors: %u exceeds max_write_same_len: %u\n", | |
274 | sectors, cmd->se_dev->dev_attrib.max_write_same_len); | |
275 | return TCM_INVALID_CDB_FIELD; | |
276 | } | |
5cb770bf RD |
277 | /* We always have ANC_SUP == 0 so setting ANCHOR is always an error */ |
278 | if (flags[0] & 0x10) { | |
279 | pr_warn("WRITE SAME with ANCHOR not supported\n"); | |
280 | return TCM_INVALID_CDB_FIELD; | |
281 | } | |
d6e0175c | 282 | /* |
cd063bef NB |
283 | * Special case for WRITE_SAME w/ UNMAP=1 that ends up getting |
284 | * translated into block discard requests within backend code. | |
d6e0175c | 285 | */ |
cd063bef NB |
286 | if (flags[0] & 0x08) { |
287 | if (!ops->execute_write_same_unmap) | |
288 | return TCM_UNSUPPORTED_SCSI_OPCODE; | |
289 | ||
290 | cmd->execute_cmd = ops->execute_write_same_unmap; | |
291 | return 0; | |
d6e0175c | 292 | } |
cd063bef NB |
293 | if (!ops->execute_write_same) |
294 | return TCM_UNSUPPORTED_SCSI_OPCODE; | |
d6e0175c | 295 | |
cd063bef | 296 | cmd->execute_cmd = ops->execute_write_same; |
d6e0175c CH |
297 | return 0; |
298 | } | |
299 | ||
a6b0133c | 300 | static sense_reason_t xdreadwrite_callback(struct se_cmd *cmd) |
d6e0175c CH |
301 | { |
302 | unsigned char *buf, *addr; | |
303 | struct scatterlist *sg; | |
304 | unsigned int offset; | |
a6b0133c NB |
305 | sense_reason_t ret = TCM_NO_SENSE; |
306 | int i, count; | |
d6e0175c CH |
307 | /* |
308 | * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command | |
309 | * | |
310 | * 1) read the specified logical block(s); | |
311 | * 2) transfer logical blocks from the data-out buffer; | |
312 | * 3) XOR the logical blocks transferred from the data-out buffer with | |
313 | * the logical blocks read, storing the resulting XOR data in a buffer; | |
314 | * 4) if the DISABLE WRITE bit is set to zero, then write the logical | |
315 | * blocks transferred from the data-out buffer; and | |
316 | * 5) transfer the resulting XOR data to the data-in buffer. | |
317 | */ | |
318 | buf = kmalloc(cmd->data_length, GFP_KERNEL); | |
319 | if (!buf) { | |
320 | pr_err("Unable to allocate xor_callback buf\n"); | |
a6b0133c | 321 | return TCM_OUT_OF_RESOURCES; |
d6e0175c CH |
322 | } |
323 | /* | |
324 | * Copy the scatterlist WRITE buffer located at cmd->t_data_sg | |
325 | * into the locally allocated *buf | |
326 | */ | |
327 | sg_copy_to_buffer(cmd->t_data_sg, | |
328 | cmd->t_data_nents, | |
329 | buf, | |
330 | cmd->data_length); | |
331 | ||
332 | /* | |
333 | * Now perform the XOR against the BIDI read memory located at | |
334 | * cmd->t_mem_bidi_list | |
335 | */ | |
336 | ||
337 | offset = 0; | |
338 | for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) { | |
339 | addr = kmap_atomic(sg_page(sg)); | |
a6b0133c NB |
340 | if (!addr) { |
341 | ret = TCM_OUT_OF_RESOURCES; | |
d6e0175c | 342 | goto out; |
a6b0133c | 343 | } |
d6e0175c CH |
344 | |
345 | for (i = 0; i < sg->length; i++) | |
346 | *(addr + sg->offset + i) ^= *(buf + offset + i); | |
347 | ||
348 | offset += sg->length; | |
349 | kunmap_atomic(addr); | |
350 | } | |
351 | ||
352 | out: | |
353 | kfree(buf); | |
a6b0133c | 354 | return ret; |
d6e0175c CH |
355 | } |
356 | ||
a82a9538 NB |
357 | static sense_reason_t |
358 | sbc_execute_rw(struct se_cmd *cmd) | |
359 | { | |
360 | return cmd->execute_rw(cmd, cmd->t_data_sg, cmd->t_data_nents, | |
361 | cmd->data_direction); | |
362 | } | |
363 | ||
68ff9b9b NB |
364 | static sense_reason_t compare_and_write_post(struct se_cmd *cmd) |
365 | { | |
366 | struct se_device *dev = cmd->se_dev; | |
367 | ||
d8855c15 NB |
368 | /* |
369 | * Only set SCF_COMPARE_AND_WRITE_POST to force a response fall-through | |
370 | * within target_complete_ok_work() if the command was successfully | |
371 | * sent to the backend driver. | |
372 | */ | |
373 | spin_lock_irq(&cmd->t_state_lock); | |
374 | if ((cmd->transport_state & CMD_T_SENT) && !cmd->scsi_status) | |
375 | cmd->se_cmd_flags |= SCF_COMPARE_AND_WRITE_POST; | |
376 | spin_unlock_irq(&cmd->t_state_lock); | |
377 | ||
68ff9b9b NB |
378 | /* |
379 | * Unlock ->caw_sem originally obtained during sbc_compare_and_write() | |
380 | * before the original READ I/O submission. | |
381 | */ | |
382 | up(&dev->caw_sem); | |
383 | ||
384 | return TCM_NO_SENSE; | |
385 | } | |
386 | ||
387 | static sense_reason_t compare_and_write_callback(struct se_cmd *cmd) | |
388 | { | |
389 | struct se_device *dev = cmd->se_dev; | |
390 | struct scatterlist *write_sg = NULL, *sg; | |
db60df88 | 391 | unsigned char *buf = NULL, *addr; |
68ff9b9b NB |
392 | struct sg_mapping_iter m; |
393 | unsigned int offset = 0, len; | |
394 | unsigned int nlbas = cmd->t_task_nolb; | |
395 | unsigned int block_size = dev->dev_attrib.block_size; | |
396 | unsigned int compare_len = (nlbas * block_size); | |
397 | sense_reason_t ret = TCM_NO_SENSE; | |
398 | int rc, i; | |
399 | ||
cf6d1f09 NB |
400 | /* |
401 | * Handle early failure in transport_generic_request_failure(), | |
402 | * which will not have taken ->caw_mutex yet.. | |
403 | */ | |
404 | if (!cmd->t_data_sg || !cmd->t_bidi_data_sg) | |
405 | return TCM_NO_SENSE; | |
db60df88 NB |
406 | /* |
407 | * Immediately exit + release dev->caw_sem if command has already | |
408 | * been failed with a non-zero SCSI status. | |
409 | */ | |
410 | if (cmd->scsi_status) { | |
411 | pr_err("compare_and_write_callback: non zero scsi_status:" | |
412 | " 0x%02x\n", cmd->scsi_status); | |
413 | goto out; | |
414 | } | |
cf6d1f09 | 415 | |
68ff9b9b NB |
416 | buf = kzalloc(cmd->data_length, GFP_KERNEL); |
417 | if (!buf) { | |
418 | pr_err("Unable to allocate compare_and_write buf\n"); | |
a2890087 NB |
419 | ret = TCM_OUT_OF_RESOURCES; |
420 | goto out; | |
68ff9b9b NB |
421 | } |
422 | ||
423 | write_sg = kzalloc(sizeof(struct scatterlist) * cmd->t_data_nents, | |
424 | GFP_KERNEL); | |
425 | if (!write_sg) { | |
426 | pr_err("Unable to allocate compare_and_write sg\n"); | |
427 | ret = TCM_OUT_OF_RESOURCES; | |
428 | goto out; | |
429 | } | |
430 | /* | |
431 | * Setup verify and write data payloads from total NumberLBAs. | |
432 | */ | |
433 | rc = sg_copy_to_buffer(cmd->t_data_sg, cmd->t_data_nents, buf, | |
434 | cmd->data_length); | |
435 | if (!rc) { | |
436 | pr_err("sg_copy_to_buffer() failed for compare_and_write\n"); | |
437 | ret = TCM_OUT_OF_RESOURCES; | |
438 | goto out; | |
439 | } | |
440 | /* | |
441 | * Compare against SCSI READ payload against verify payload | |
442 | */ | |
443 | for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, i) { | |
444 | addr = (unsigned char *)kmap_atomic(sg_page(sg)); | |
445 | if (!addr) { | |
446 | ret = TCM_OUT_OF_RESOURCES; | |
447 | goto out; | |
448 | } | |
449 | ||
450 | len = min(sg->length, compare_len); | |
451 | ||
452 | if (memcmp(addr, buf + offset, len)) { | |
453 | pr_warn("Detected MISCOMPARE for addr: %p buf: %p\n", | |
454 | addr, buf + offset); | |
455 | kunmap_atomic(addr); | |
456 | goto miscompare; | |
457 | } | |
458 | kunmap_atomic(addr); | |
459 | ||
460 | offset += len; | |
461 | compare_len -= len; | |
462 | if (!compare_len) | |
463 | break; | |
464 | } | |
465 | ||
466 | i = 0; | |
467 | len = cmd->t_task_nolb * block_size; | |
468 | sg_miter_start(&m, cmd->t_data_sg, cmd->t_data_nents, SG_MITER_TO_SG); | |
469 | /* | |
470 | * Currently assumes NoLB=1 and SGLs are PAGE_SIZE.. | |
471 | */ | |
472 | while (len) { | |
473 | sg_miter_next(&m); | |
474 | ||
475 | if (block_size < PAGE_SIZE) { | |
476 | sg_set_page(&write_sg[i], m.page, block_size, | |
477 | block_size); | |
478 | } else { | |
479 | sg_miter_next(&m); | |
480 | sg_set_page(&write_sg[i], m.page, block_size, | |
481 | 0); | |
482 | } | |
483 | len -= block_size; | |
484 | i++; | |
485 | } | |
486 | sg_miter_stop(&m); | |
487 | /* | |
488 | * Save the original SGL + nents values before updating to new | |
489 | * assignments, to be released in transport_free_pages() -> | |
490 | * transport_reset_sgl_orig() | |
491 | */ | |
492 | cmd->t_data_sg_orig = cmd->t_data_sg; | |
493 | cmd->t_data_sg = write_sg; | |
494 | cmd->t_data_nents_orig = cmd->t_data_nents; | |
495 | cmd->t_data_nents = 1; | |
496 | ||
497 | cmd->sam_task_attr = MSG_HEAD_TAG; | |
498 | cmd->transport_complete_callback = compare_and_write_post; | |
499 | /* | |
500 | * Now reset ->execute_cmd() to the normal sbc_execute_rw() handler | |
501 | * for submitting the adjusted SGL to write instance user-data. | |
502 | */ | |
503 | cmd->execute_cmd = sbc_execute_rw; | |
504 | ||
505 | spin_lock_irq(&cmd->t_state_lock); | |
506 | cmd->t_state = TRANSPORT_PROCESSING; | |
507 | cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT; | |
508 | spin_unlock_irq(&cmd->t_state_lock); | |
509 | ||
510 | __target_execute_cmd(cmd); | |
511 | ||
512 | kfree(buf); | |
513 | return ret; | |
514 | ||
515 | miscompare: | |
516 | pr_warn("Target/%s: Send MISCOMPARE check condition and sense\n", | |
517 | dev->transport->name); | |
518 | ret = TCM_MISCOMPARE_VERIFY; | |
519 | out: | |
520 | /* | |
521 | * In the MISCOMPARE or failure case, unlock ->caw_sem obtained in | |
522 | * sbc_compare_and_write() before the original READ I/O submission. | |
523 | */ | |
524 | up(&dev->caw_sem); | |
525 | kfree(write_sg); | |
526 | kfree(buf); | |
527 | return ret; | |
528 | } | |
529 | ||
530 | static sense_reason_t | |
531 | sbc_compare_and_write(struct se_cmd *cmd) | |
532 | { | |
533 | struct se_device *dev = cmd->se_dev; | |
534 | sense_reason_t ret; | |
535 | int rc; | |
536 | /* | |
537 | * Submit the READ first for COMPARE_AND_WRITE to perform the | |
538 | * comparision using SGLs at cmd->t_bidi_data_sg.. | |
539 | */ | |
540 | rc = down_interruptible(&dev->caw_sem); | |
541 | if ((rc != 0) || signal_pending(current)) { | |
542 | cmd->transport_complete_callback = NULL; | |
543 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
544 | } | |
b7191253 NB |
545 | /* |
546 | * Reset cmd->data_length to individual block_size in order to not | |
547 | * confuse backend drivers that depend on this value matching the | |
548 | * size of the I/O being submitted. | |
549 | */ | |
550 | cmd->data_length = cmd->t_task_nolb * dev->dev_attrib.block_size; | |
68ff9b9b NB |
551 | |
552 | ret = cmd->execute_rw(cmd, cmd->t_bidi_data_sg, cmd->t_bidi_data_nents, | |
553 | DMA_FROM_DEVICE); | |
554 | if (ret) { | |
555 | cmd->transport_complete_callback = NULL; | |
556 | up(&dev->caw_sem); | |
557 | return ret; | |
558 | } | |
559 | /* | |
560 | * Unlock of dev->caw_sem to occur in compare_and_write_callback() | |
561 | * upon MISCOMPARE, or in compare_and_write_done() upon completion | |
562 | * of WRITE instance user-data. | |
563 | */ | |
564 | return TCM_NO_SENSE; | |
565 | } | |
566 | ||
499bf77b NB |
567 | static bool |
568 | sbc_check_prot(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb, | |
569 | u32 sectors) | |
570 | { | |
571 | if (!cmd->t_prot_sg || !cmd->t_prot_nents) | |
572 | return true; | |
573 | ||
574 | switch (dev->dev_attrib.pi_prot_type) { | |
575 | case TARGET_DIF_TYPE3_PROT: | |
576 | if (!(cdb[1] & 0xe0)) | |
577 | return true; | |
578 | ||
579 | cmd->reftag_seed = 0xffffffff; | |
580 | break; | |
581 | case TARGET_DIF_TYPE2_PROT: | |
582 | if (cdb[1] & 0xe0) | |
583 | return false; | |
584 | ||
585 | cmd->reftag_seed = cmd->t_task_lba; | |
586 | break; | |
587 | case TARGET_DIF_TYPE1_PROT: | |
588 | if (!(cdb[1] & 0xe0)) | |
589 | return true; | |
590 | ||
591 | cmd->reftag_seed = cmd->t_task_lba; | |
592 | break; | |
593 | case TARGET_DIF_TYPE0_PROT: | |
594 | default: | |
595 | return true; | |
596 | } | |
597 | ||
598 | cmd->prot_type = dev->dev_attrib.pi_prot_type; | |
599 | cmd->prot_length = dev->prot_length * sectors; | |
600 | cmd->prot_handover = PROT_SEPERATED; | |
601 | ||
602 | return true; | |
603 | } | |
604 | ||
de103c93 CH |
605 | sense_reason_t |
606 | sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops) | |
d6e0175c | 607 | { |
d6e0175c CH |
608 | struct se_device *dev = cmd->se_dev; |
609 | unsigned char *cdb = cmd->t_task_cdb; | |
1fd032ee | 610 | unsigned int size; |
d6e0175c | 611 | u32 sectors = 0; |
de103c93 | 612 | sense_reason_t ret; |
d6e0175c CH |
613 | |
614 | switch (cdb[0]) { | |
615 | case READ_6: | |
616 | sectors = transport_get_sectors_6(cdb); | |
617 | cmd->t_task_lba = transport_lba_21(cdb); | |
618 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
a82a9538 NB |
619 | cmd->execute_rw = ops->execute_rw; |
620 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c CH |
621 | break; |
622 | case READ_10: | |
623 | sectors = transport_get_sectors_10(cdb); | |
624 | cmd->t_task_lba = transport_lba_32(cdb); | |
499bf77b NB |
625 | |
626 | if (!sbc_check_prot(dev, cmd, cdb, sectors)) | |
627 | return TCM_UNSUPPORTED_SCSI_OPCODE; | |
628 | ||
d6e0175c | 629 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
a82a9538 NB |
630 | cmd->execute_rw = ops->execute_rw; |
631 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c CH |
632 | break; |
633 | case READ_12: | |
634 | sectors = transport_get_sectors_12(cdb); | |
635 | cmd->t_task_lba = transport_lba_32(cdb); | |
499bf77b NB |
636 | |
637 | if (!sbc_check_prot(dev, cmd, cdb, sectors)) | |
638 | return TCM_UNSUPPORTED_SCSI_OPCODE; | |
639 | ||
d6e0175c | 640 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
a82a9538 NB |
641 | cmd->execute_rw = ops->execute_rw; |
642 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c CH |
643 | break; |
644 | case READ_16: | |
645 | sectors = transport_get_sectors_16(cdb); | |
646 | cmd->t_task_lba = transport_lba_64(cdb); | |
499bf77b NB |
647 | |
648 | if (!sbc_check_prot(dev, cmd, cdb, sectors)) | |
649 | return TCM_UNSUPPORTED_SCSI_OPCODE; | |
650 | ||
d6e0175c | 651 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
a82a9538 NB |
652 | cmd->execute_rw = ops->execute_rw; |
653 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c CH |
654 | break; |
655 | case WRITE_6: | |
656 | sectors = transport_get_sectors_6(cdb); | |
657 | cmd->t_task_lba = transport_lba_21(cdb); | |
658 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
a82a9538 NB |
659 | cmd->execute_rw = ops->execute_rw; |
660 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c CH |
661 | break; |
662 | case WRITE_10: | |
663 | case WRITE_VERIFY: | |
664 | sectors = transport_get_sectors_10(cdb); | |
665 | cmd->t_task_lba = transport_lba_32(cdb); | |
499bf77b NB |
666 | |
667 | if (!sbc_check_prot(dev, cmd, cdb, sectors)) | |
668 | return TCM_UNSUPPORTED_SCSI_OPCODE; | |
669 | ||
d6e0175c CH |
670 | if (cdb[1] & 0x8) |
671 | cmd->se_cmd_flags |= SCF_FUA; | |
672 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
a82a9538 NB |
673 | cmd->execute_rw = ops->execute_rw; |
674 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c CH |
675 | break; |
676 | case WRITE_12: | |
677 | sectors = transport_get_sectors_12(cdb); | |
678 | cmd->t_task_lba = transport_lba_32(cdb); | |
499bf77b NB |
679 | |
680 | if (!sbc_check_prot(dev, cmd, cdb, sectors)) | |
681 | return TCM_UNSUPPORTED_SCSI_OPCODE; | |
682 | ||
d6e0175c CH |
683 | if (cdb[1] & 0x8) |
684 | cmd->se_cmd_flags |= SCF_FUA; | |
685 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
a82a9538 NB |
686 | cmd->execute_rw = ops->execute_rw; |
687 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c CH |
688 | break; |
689 | case WRITE_16: | |
690 | sectors = transport_get_sectors_16(cdb); | |
691 | cmd->t_task_lba = transport_lba_64(cdb); | |
499bf77b NB |
692 | |
693 | if (!sbc_check_prot(dev, cmd, cdb, sectors)) | |
694 | return TCM_UNSUPPORTED_SCSI_OPCODE; | |
695 | ||
d6e0175c CH |
696 | if (cdb[1] & 0x8) |
697 | cmd->se_cmd_flags |= SCF_FUA; | |
698 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
a82a9538 NB |
699 | cmd->execute_rw = ops->execute_rw; |
700 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c CH |
701 | break; |
702 | case XDWRITEREAD_10: | |
de103c93 | 703 | if (cmd->data_direction != DMA_TO_DEVICE || |
d6e0175c | 704 | !(cmd->se_cmd_flags & SCF_BIDI)) |
de103c93 | 705 | return TCM_INVALID_CDB_FIELD; |
d6e0175c CH |
706 | sectors = transport_get_sectors_10(cdb); |
707 | ||
708 | cmd->t_task_lba = transport_lba_32(cdb); | |
709 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
710 | ||
711 | /* | |
712 | * Setup BIDI XOR callback to be run after I/O completion. | |
713 | */ | |
a82a9538 NB |
714 | cmd->execute_rw = ops->execute_rw; |
715 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c CH |
716 | cmd->transport_complete_callback = &xdreadwrite_callback; |
717 | if (cdb[1] & 0x8) | |
718 | cmd->se_cmd_flags |= SCF_FUA; | |
719 | break; | |
720 | case VARIABLE_LENGTH_CMD: | |
721 | { | |
722 | u16 service_action = get_unaligned_be16(&cdb[8]); | |
723 | switch (service_action) { | |
724 | case XDWRITEREAD_32: | |
725 | sectors = transport_get_sectors_32(cdb); | |
726 | ||
727 | /* | |
728 | * Use WRITE_32 and READ_32 opcodes for the emulated | |
729 | * XDWRITE_READ_32 logic. | |
730 | */ | |
731 | cmd->t_task_lba = transport_lba_64_ext(cdb); | |
732 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
733 | ||
734 | /* | |
735 | * Setup BIDI XOR callback to be run during after I/O | |
736 | * completion. | |
737 | */ | |
a82a9538 NB |
738 | cmd->execute_rw = ops->execute_rw; |
739 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c CH |
740 | cmd->transport_complete_callback = &xdreadwrite_callback; |
741 | if (cdb[1] & 0x8) | |
742 | cmd->se_cmd_flags |= SCF_FUA; | |
743 | break; | |
744 | case WRITE_SAME_32: | |
745 | sectors = transport_get_sectors_32(cdb); | |
746 | if (!sectors) { | |
747 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not" | |
748 | " supported\n"); | |
de103c93 | 749 | return TCM_INVALID_CDB_FIELD; |
d6e0175c CH |
750 | } |
751 | ||
1fd032ee | 752 | size = sbc_get_size(cmd, 1); |
d6e0175c CH |
753 | cmd->t_task_lba = get_unaligned_be64(&cdb[12]); |
754 | ||
cd063bef | 755 | ret = sbc_setup_write_same(cmd, &cdb[10], ops); |
6b64e1fe | 756 | if (ret) |
cd063bef | 757 | return ret; |
d6e0175c CH |
758 | break; |
759 | default: | |
760 | pr_err("VARIABLE_LENGTH_CMD service action" | |
761 | " 0x%04x not supported\n", service_action); | |
de103c93 | 762 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
d6e0175c CH |
763 | } |
764 | break; | |
765 | } | |
68ff9b9b NB |
766 | case COMPARE_AND_WRITE: |
767 | sectors = cdb[13]; | |
768 | /* | |
769 | * Currently enforce COMPARE_AND_WRITE for a single sector | |
770 | */ | |
771 | if (sectors > 1) { | |
772 | pr_err("COMPARE_AND_WRITE contains NoLB: %u greater" | |
773 | " than 1\n", sectors); | |
774 | return TCM_INVALID_CDB_FIELD; | |
775 | } | |
776 | /* | |
777 | * Double size because we have two buffers, note that | |
778 | * zero is not an error.. | |
779 | */ | |
780 | size = 2 * sbc_get_size(cmd, sectors); | |
781 | cmd->t_task_lba = get_unaligned_be64(&cdb[2]); | |
782 | cmd->t_task_nolb = sectors; | |
783 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB | SCF_COMPARE_AND_WRITE; | |
784 | cmd->execute_rw = ops->execute_rw; | |
785 | cmd->execute_cmd = sbc_compare_and_write; | |
786 | cmd->transport_complete_callback = compare_and_write_callback; | |
787 | break; | |
d6e0175c | 788 | case READ_CAPACITY: |
1fd032ee CH |
789 | size = READ_CAP_LEN; |
790 | cmd->execute_cmd = sbc_emulate_readcapacity; | |
d6e0175c CH |
791 | break; |
792 | case SERVICE_ACTION_IN: | |
793 | switch (cmd->t_task_cdb[1] & 0x1f) { | |
794 | case SAI_READ_CAPACITY_16: | |
1fd032ee | 795 | cmd->execute_cmd = sbc_emulate_readcapacity_16; |
d6e0175c | 796 | break; |
c66094bf HR |
797 | case SAI_REPORT_REFERRALS: |
798 | cmd->execute_cmd = target_emulate_report_referrals; | |
799 | break; | |
d6e0175c CH |
800 | default: |
801 | pr_err("Unsupported SA: 0x%02x\n", | |
802 | cmd->t_task_cdb[1] & 0x1f); | |
de103c93 | 803 | return TCM_INVALID_CDB_FIELD; |
d6e0175c | 804 | } |
1fd032ee | 805 | size = (cdb[10] << 24) | (cdb[11] << 16) | |
d6e0175c CH |
806 | (cdb[12] << 8) | cdb[13]; |
807 | break; | |
808 | case SYNCHRONIZE_CACHE: | |
809 | case SYNCHRONIZE_CACHE_16: | |
882e3f8e HR |
810 | if (!ops->execute_sync_cache) { |
811 | size = 0; | |
812 | cmd->execute_cmd = sbc_emulate_noop; | |
813 | break; | |
814 | } | |
ad67f0d9 | 815 | |
d6e0175c CH |
816 | /* |
817 | * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE | |
818 | */ | |
819 | if (cdb[0] == SYNCHRONIZE_CACHE) { | |
820 | sectors = transport_get_sectors_10(cdb); | |
821 | cmd->t_task_lba = transport_lba_32(cdb); | |
822 | } else { | |
823 | sectors = transport_get_sectors_16(cdb); | |
824 | cmd->t_task_lba = transport_lba_64(cdb); | |
825 | } | |
826 | ||
1fd032ee | 827 | size = sbc_get_size(cmd, sectors); |
d6e0175c CH |
828 | |
829 | /* | |
830 | * Check to ensure that LBA + Range does not exceed past end of | |
831 | * device for IBLOCK and FILEIO ->do_sync_cache() backend calls | |
832 | */ | |
833 | if (cmd->t_task_lba || sectors) { | |
834 | if (sbc_check_valid_sectors(cmd) < 0) | |
33633676 | 835 | return TCM_ADDRESS_OUT_OF_RANGE; |
d6e0175c | 836 | } |
ad67f0d9 | 837 | cmd->execute_cmd = ops->execute_sync_cache; |
d6e0175c CH |
838 | break; |
839 | case UNMAP: | |
14150a6b | 840 | if (!ops->execute_unmap) |
de103c93 | 841 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
14150a6b | 842 | |
1fd032ee | 843 | size = get_unaligned_be16(&cdb[7]); |
14150a6b | 844 | cmd->execute_cmd = ops->execute_unmap; |
d6e0175c CH |
845 | break; |
846 | case WRITE_SAME_16: | |
847 | sectors = transport_get_sectors_16(cdb); | |
848 | if (!sectors) { | |
849 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); | |
de103c93 | 850 | return TCM_INVALID_CDB_FIELD; |
d6e0175c CH |
851 | } |
852 | ||
1fd032ee | 853 | size = sbc_get_size(cmd, 1); |
d6e0175c CH |
854 | cmd->t_task_lba = get_unaligned_be64(&cdb[2]); |
855 | ||
cd063bef | 856 | ret = sbc_setup_write_same(cmd, &cdb[1], ops); |
6b64e1fe | 857 | if (ret) |
cd063bef | 858 | return ret; |
d6e0175c CH |
859 | break; |
860 | case WRITE_SAME: | |
861 | sectors = transport_get_sectors_10(cdb); | |
862 | if (!sectors) { | |
863 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); | |
de103c93 | 864 | return TCM_INVALID_CDB_FIELD; |
d6e0175c CH |
865 | } |
866 | ||
1fd032ee | 867 | size = sbc_get_size(cmd, 1); |
d6e0175c CH |
868 | cmd->t_task_lba = get_unaligned_be32(&cdb[2]); |
869 | ||
870 | /* | |
871 | * Follow sbcr26 with WRITE_SAME (10) and check for the existence | |
872 | * of byte 1 bit 3 UNMAP instead of original reserved field | |
873 | */ | |
cd063bef | 874 | ret = sbc_setup_write_same(cmd, &cdb[1], ops); |
6b64e1fe | 875 | if (ret) |
cd063bef | 876 | return ret; |
d6e0175c CH |
877 | break; |
878 | case VERIFY: | |
1fd032ee | 879 | size = 0; |
1920ed61 | 880 | cmd->execute_cmd = sbc_emulate_noop; |
d6e0175c | 881 | break; |
1a1ff38c BK |
882 | case REZERO_UNIT: |
883 | case SEEK_6: | |
884 | case SEEK_10: | |
885 | /* | |
886 | * There are still clients out there which use these old SCSI-2 | |
887 | * commands. This mainly happens when running VMs with legacy | |
888 | * guest systems, connected via SCSI command pass-through to | |
889 | * iSCSI targets. Make them happy and return status GOOD. | |
890 | */ | |
891 | size = 0; | |
892 | cmd->execute_cmd = sbc_emulate_noop; | |
893 | break; | |
d6e0175c | 894 | default: |
1fd032ee | 895 | ret = spc_parse_cdb(cmd, &size); |
d6e0175c CH |
896 | if (ret) |
897 | return ret; | |
898 | } | |
899 | ||
900 | /* reject any command that we don't have a handler for */ | |
901 | if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) && !cmd->execute_cmd) | |
de103c93 | 902 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
d6e0175c CH |
903 | |
904 | if (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) { | |
1fd032ee CH |
905 | unsigned long long end_lba; |
906 | ||
0fd97ccf | 907 | if (sectors > dev->dev_attrib.fabric_max_sectors) { |
d6e0175c CH |
908 | printk_ratelimited(KERN_ERR "SCSI OP %02xh with too" |
909 | " big sectors %u exceeds fabric_max_sectors:" | |
910 | " %u\n", cdb[0], sectors, | |
0fd97ccf | 911 | dev->dev_attrib.fabric_max_sectors); |
de103c93 | 912 | return TCM_INVALID_CDB_FIELD; |
d6e0175c | 913 | } |
0fd97ccf | 914 | if (sectors > dev->dev_attrib.hw_max_sectors) { |
d6e0175c CH |
915 | printk_ratelimited(KERN_ERR "SCSI OP %02xh with too" |
916 | " big sectors %u exceeds backend hw_max_sectors:" | |
917 | " %u\n", cdb[0], sectors, | |
0fd97ccf | 918 | dev->dev_attrib.hw_max_sectors); |
de103c93 | 919 | return TCM_INVALID_CDB_FIELD; |
d6e0175c CH |
920 | } |
921 | ||
1fd032ee CH |
922 | end_lba = dev->transport->get_blocks(dev) + 1; |
923 | if (cmd->t_task_lba + sectors > end_lba) { | |
924 | pr_err("cmd exceeds last lba %llu " | |
925 | "(lba %llu, sectors %u)\n", | |
926 | end_lba, cmd->t_task_lba, sectors); | |
09ceadc7 | 927 | return TCM_ADDRESS_OUT_OF_RANGE; |
1fd032ee CH |
928 | } |
929 | ||
68ff9b9b NB |
930 | if (!(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) |
931 | size = sbc_get_size(cmd, sectors); | |
d6e0175c CH |
932 | } |
933 | ||
de103c93 | 934 | return target_cmd_size_check(cmd, size); |
d6e0175c CH |
935 | } |
936 | EXPORT_SYMBOL(sbc_parse_cdb); | |
6f23ac8a | 937 | |
6f23ac8a CH |
938 | u32 sbc_get_device_type(struct se_device *dev) |
939 | { | |
940 | return TYPE_DISK; | |
941 | } | |
942 | EXPORT_SYMBOL(sbc_get_device_type); | |
86d71829 AH |
943 | |
944 | sense_reason_t | |
945 | sbc_execute_unmap(struct se_cmd *cmd, | |
946 | sense_reason_t (*do_unmap_fn)(struct se_cmd *, void *, | |
947 | sector_t, sector_t), | |
948 | void *priv) | |
949 | { | |
950 | struct se_device *dev = cmd->se_dev; | |
951 | unsigned char *buf, *ptr = NULL; | |
952 | sector_t lba; | |
953 | int size; | |
954 | u32 range; | |
955 | sense_reason_t ret = 0; | |
956 | int dl, bd_dl; | |
957 | ||
958 | /* We never set ANC_SUP */ | |
959 | if (cmd->t_task_cdb[1]) | |
960 | return TCM_INVALID_CDB_FIELD; | |
961 | ||
962 | if (cmd->data_length == 0) { | |
963 | target_complete_cmd(cmd, SAM_STAT_GOOD); | |
964 | return 0; | |
965 | } | |
966 | ||
967 | if (cmd->data_length < 8) { | |
968 | pr_warn("UNMAP parameter list length %u too small\n", | |
969 | cmd->data_length); | |
970 | return TCM_PARAMETER_LIST_LENGTH_ERROR; | |
971 | } | |
972 | ||
973 | buf = transport_kmap_data_sg(cmd); | |
974 | if (!buf) | |
975 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
976 | ||
977 | dl = get_unaligned_be16(&buf[0]); | |
978 | bd_dl = get_unaligned_be16(&buf[2]); | |
979 | ||
980 | size = cmd->data_length - 8; | |
981 | if (bd_dl > size) | |
982 | pr_warn("UNMAP parameter list length %u too small, ignoring bd_dl %u\n", | |
983 | cmd->data_length, bd_dl); | |
984 | else | |
985 | size = bd_dl; | |
986 | ||
987 | if (size / 16 > dev->dev_attrib.max_unmap_block_desc_count) { | |
988 | ret = TCM_INVALID_PARAMETER_LIST; | |
989 | goto err; | |
990 | } | |
991 | ||
992 | /* First UNMAP block descriptor starts at 8 byte offset */ | |
993 | ptr = &buf[8]; | |
994 | pr_debug("UNMAP: Sub: %s Using dl: %u bd_dl: %u size: %u" | |
995 | " ptr: %p\n", dev->transport->name, dl, bd_dl, size, ptr); | |
996 | ||
997 | while (size >= 16) { | |
998 | lba = get_unaligned_be64(&ptr[0]); | |
999 | range = get_unaligned_be32(&ptr[8]); | |
1000 | pr_debug("UNMAP: Using lba: %llu and range: %u\n", | |
1001 | (unsigned long long)lba, range); | |
1002 | ||
1003 | if (range > dev->dev_attrib.max_unmap_lba_count) { | |
1004 | ret = TCM_INVALID_PARAMETER_LIST; | |
1005 | goto err; | |
1006 | } | |
1007 | ||
1008 | if (lba + range > dev->transport->get_blocks(dev) + 1) { | |
1009 | ret = TCM_ADDRESS_OUT_OF_RANGE; | |
1010 | goto err; | |
1011 | } | |
1012 | ||
1013 | ret = do_unmap_fn(cmd, priv, lba, range); | |
1014 | if (ret) | |
1015 | goto err; | |
1016 | ||
1017 | ptr += 16; | |
1018 | size -= 16; | |
1019 | } | |
1020 | ||
1021 | err: | |
1022 | transport_kunmap_data_sg(cmd); | |
1023 | if (!ret) | |
1024 | target_complete_cmd(cmd, GOOD); | |
1025 | return ret; | |
1026 | } | |
1027 | EXPORT_SYMBOL(sbc_execute_unmap); | |
41861fa8 NB |
1028 | |
1029 | static sense_reason_t | |
1030 | sbc_dif_v1_verify(struct se_device *dev, struct se_dif_v1_tuple *sdt, | |
1031 | const void *p, sector_t sector, unsigned int ei_lba) | |
1032 | { | |
1033 | int block_size = dev->dev_attrib.block_size; | |
1034 | __be16 csum; | |
1035 | ||
1036 | csum = cpu_to_be16(crc_t10dif(p, block_size)); | |
1037 | ||
1038 | if (sdt->guard_tag != csum) { | |
1039 | pr_err("DIFv1 checksum failed on sector %llu guard tag 0x%04x" | |
1040 | " csum 0x%04x\n", (unsigned long long)sector, | |
1041 | be16_to_cpu(sdt->guard_tag), be16_to_cpu(csum)); | |
1042 | return TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED; | |
1043 | } | |
1044 | ||
1045 | if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE1_PROT && | |
1046 | be32_to_cpu(sdt->ref_tag) != (sector & 0xffffffff)) { | |
1047 | pr_err("DIFv1 Type 1 reference failed on sector: %llu tag: 0x%08x" | |
1048 | " sector MSB: 0x%08x\n", (unsigned long long)sector, | |
1049 | be32_to_cpu(sdt->ref_tag), (u32)(sector & 0xffffffff)); | |
1050 | return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED; | |
1051 | } | |
1052 | ||
1053 | if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE2_PROT && | |
1054 | be32_to_cpu(sdt->ref_tag) != ei_lba) { | |
1055 | pr_err("DIFv1 Type 2 reference failed on sector: %llu tag: 0x%08x" | |
1056 | " ei_lba: 0x%08x\n", (unsigned long long)sector, | |
1057 | be32_to_cpu(sdt->ref_tag), ei_lba); | |
1058 | return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED; | |
1059 | } | |
1060 | ||
1061 | return 0; | |
1062 | } | |
1063 | ||
1064 | static void | |
1065 | sbc_dif_copy_prot(struct se_cmd *cmd, unsigned int sectors, bool read, | |
1066 | struct scatterlist *sg, int sg_off) | |
1067 | { | |
1068 | struct se_device *dev = cmd->se_dev; | |
1069 | struct scatterlist *psg; | |
1070 | void *paddr, *addr; | |
1071 | unsigned int i, len, left; | |
1072 | ||
1073 | left = sectors * dev->prot_length; | |
1074 | ||
1075 | for_each_sg(cmd->t_prot_sg, psg, cmd->t_prot_nents, i) { | |
1076 | ||
1077 | len = min(psg->length, left); | |
1078 | paddr = kmap_atomic(sg_page(psg)) + psg->offset; | |
1079 | addr = kmap_atomic(sg_page(sg)) + sg_off; | |
1080 | ||
1081 | if (read) | |
1082 | memcpy(paddr, addr, len); | |
1083 | else | |
1084 | memcpy(addr, paddr, len); | |
1085 | ||
1086 | left -= len; | |
1087 | kunmap_atomic(paddr); | |
1088 | kunmap_atomic(addr); | |
1089 | } | |
1090 | } | |
1091 | ||
1092 | sense_reason_t | |
1093 | sbc_dif_verify_write(struct se_cmd *cmd, sector_t start, unsigned int sectors, | |
1094 | unsigned int ei_lba, struct scatterlist *sg, int sg_off) | |
1095 | { | |
1096 | struct se_device *dev = cmd->se_dev; | |
1097 | struct se_dif_v1_tuple *sdt; | |
1098 | struct scatterlist *dsg, *psg = cmd->t_prot_sg; | |
1099 | sector_t sector = start; | |
1100 | void *daddr, *paddr; | |
1101 | int i, j, offset = 0; | |
1102 | sense_reason_t rc; | |
1103 | ||
1104 | for_each_sg(cmd->t_data_sg, dsg, cmd->t_data_nents, i) { | |
1105 | daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; | |
1106 | paddr = kmap_atomic(sg_page(psg)) + psg->offset; | |
1107 | ||
1108 | for (j = 0; j < dsg->length; j += dev->dev_attrib.block_size) { | |
1109 | ||
1110 | if (offset >= psg->length) { | |
1111 | kunmap_atomic(paddr); | |
1112 | psg = sg_next(psg); | |
1113 | paddr = kmap_atomic(sg_page(psg)) + psg->offset; | |
1114 | offset = 0; | |
1115 | } | |
1116 | ||
1117 | sdt = paddr + offset; | |
1118 | ||
1119 | pr_debug("DIF WRITE sector: %llu guard_tag: 0x%04x" | |
1120 | " app_tag: 0x%04x ref_tag: %u\n", | |
1121 | (unsigned long long)sector, sdt->guard_tag, | |
1122 | sdt->app_tag, be32_to_cpu(sdt->ref_tag)); | |
1123 | ||
1124 | rc = sbc_dif_v1_verify(dev, sdt, daddr + j, sector, | |
1125 | ei_lba); | |
1126 | if (rc) { | |
1127 | kunmap_atomic(paddr); | |
1128 | kunmap_atomic(daddr); | |
1129 | return rc; | |
1130 | } | |
1131 | ||
1132 | sector++; | |
1133 | ei_lba++; | |
1134 | offset += sizeof(struct se_dif_v1_tuple); | |
1135 | } | |
1136 | ||
1137 | kunmap_atomic(paddr); | |
1138 | kunmap_atomic(daddr); | |
1139 | } | |
1140 | sbc_dif_copy_prot(cmd, sectors, false, sg, sg_off); | |
1141 | ||
1142 | return 0; | |
1143 | } | |
1144 | EXPORT_SYMBOL(sbc_dif_verify_write); | |
1145 | ||
1146 | sense_reason_t | |
1147 | sbc_dif_verify_read(struct se_cmd *cmd, sector_t start, unsigned int sectors, | |
1148 | unsigned int ei_lba, struct scatterlist *sg, int sg_off) | |
1149 | { | |
1150 | struct se_device *dev = cmd->se_dev; | |
1151 | struct se_dif_v1_tuple *sdt; | |
1152 | struct scatterlist *dsg; | |
1153 | sector_t sector = start; | |
1154 | void *daddr, *paddr; | |
1155 | int i, j, offset = sg_off; | |
1156 | sense_reason_t rc; | |
1157 | ||
1158 | for_each_sg(cmd->t_data_sg, dsg, cmd->t_data_nents, i) { | |
1159 | daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; | |
1160 | paddr = kmap_atomic(sg_page(sg)) + sg->offset; | |
1161 | ||
1162 | for (j = 0; j < dsg->length; j += dev->dev_attrib.block_size) { | |
1163 | ||
1164 | if (offset >= sg->length) { | |
1165 | kunmap_atomic(paddr); | |
1166 | sg = sg_next(sg); | |
1167 | paddr = kmap_atomic(sg_page(sg)) + sg->offset; | |
1168 | offset = 0; | |
1169 | } | |
1170 | ||
1171 | sdt = paddr + offset; | |
1172 | ||
1173 | pr_debug("DIF READ sector: %llu guard_tag: 0x%04x" | |
1174 | " app_tag: 0x%04x ref_tag: %u\n", | |
1175 | (unsigned long long)sector, sdt->guard_tag, | |
1176 | sdt->app_tag, be32_to_cpu(sdt->ref_tag)); | |
1177 | ||
1178 | if (sdt->app_tag == cpu_to_be16(0xffff)) { | |
1179 | sector++; | |
1180 | offset += sizeof(struct se_dif_v1_tuple); | |
1181 | continue; | |
1182 | } | |
1183 | ||
1184 | rc = sbc_dif_v1_verify(dev, sdt, daddr + j, sector, | |
1185 | ei_lba); | |
1186 | if (rc) { | |
1187 | kunmap_atomic(paddr); | |
1188 | kunmap_atomic(daddr); | |
1189 | return rc; | |
1190 | } | |
1191 | ||
1192 | sector++; | |
1193 | ei_lba++; | |
1194 | offset += sizeof(struct se_dif_v1_tuple); | |
1195 | } | |
1196 | ||
1197 | kunmap_atomic(paddr); | |
1198 | kunmap_atomic(daddr); | |
1199 | } | |
1200 | sbc_dif_copy_prot(cmd, sectors, true, sg, sg_off); | |
1201 | ||
1202 | return 0; | |
1203 | } | |
1204 | EXPORT_SYMBOL(sbc_dif_verify_read); |