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 | 27 | #include <asm/unaligned.h> |
ba929992 | 28 | #include <scsi/scsi_proto.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 | |
afd73f1b NB |
39 | static sense_reason_t |
40 | sbc_check_prot(struct se_device *, struct se_cmd *, unsigned char *, u32, bool); | |
62e46942 | 41 | static sense_reason_t sbc_execute_unmap(struct se_cmd *cmd); |
afd73f1b | 42 | |
de103c93 CH |
43 | static sense_reason_t |
44 | sbc_emulate_readcapacity(struct se_cmd *cmd) | |
1fd032ee CH |
45 | { |
46 | struct se_device *dev = cmd->se_dev; | |
8dc8632a | 47 | unsigned char *cdb = cmd->t_task_cdb; |
1fd032ee | 48 | unsigned long long blocks_long = dev->transport->get_blocks(dev); |
a50da144 PB |
49 | unsigned char *rbuf; |
50 | unsigned char buf[8]; | |
1fd032ee CH |
51 | u32 blocks; |
52 | ||
8dc8632a RD |
53 | /* |
54 | * SBC-2 says: | |
55 | * If the PMI bit is set to zero and the LOGICAL BLOCK | |
56 | * ADDRESS field is not set to zero, the device server shall | |
57 | * terminate the command with CHECK CONDITION status with | |
58 | * the sense key set to ILLEGAL REQUEST and the additional | |
59 | * sense code set to INVALID FIELD IN CDB. | |
60 | * | |
61 | * In SBC-3, these fields are obsolete, but some SCSI | |
62 | * compliance tests actually check this, so we might as well | |
63 | * follow SBC-2. | |
64 | */ | |
65 | if (!(cdb[8] & 1) && !!(cdb[2] | cdb[3] | cdb[4] | cdb[5])) | |
66 | return TCM_INVALID_CDB_FIELD; | |
67 | ||
1fd032ee CH |
68 | if (blocks_long >= 0x00000000ffffffff) |
69 | blocks = 0xffffffff; | |
70 | else | |
71 | blocks = (u32)blocks_long; | |
72 | ||
1fd032ee CH |
73 | buf[0] = (blocks >> 24) & 0xff; |
74 | buf[1] = (blocks >> 16) & 0xff; | |
75 | buf[2] = (blocks >> 8) & 0xff; | |
76 | buf[3] = blocks & 0xff; | |
0fd97ccf CH |
77 | buf[4] = (dev->dev_attrib.block_size >> 24) & 0xff; |
78 | buf[5] = (dev->dev_attrib.block_size >> 16) & 0xff; | |
79 | buf[6] = (dev->dev_attrib.block_size >> 8) & 0xff; | |
80 | buf[7] = dev->dev_attrib.block_size & 0xff; | |
1fd032ee | 81 | |
a50da144 | 82 | rbuf = transport_kmap_data_sg(cmd); |
8b4b0dcb NB |
83 | if (rbuf) { |
84 | memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length)); | |
85 | transport_kunmap_data_sg(cmd); | |
86 | } | |
1fd032ee | 87 | |
2426bd45 | 88 | target_complete_cmd_with_length(cmd, GOOD, 8); |
1fd032ee CH |
89 | return 0; |
90 | } | |
91 | ||
de103c93 CH |
92 | static sense_reason_t |
93 | sbc_emulate_readcapacity_16(struct se_cmd *cmd) | |
1fd032ee CH |
94 | { |
95 | struct se_device *dev = cmd->se_dev; | |
2d335983 | 96 | struct se_session *sess = cmd->se_sess; |
9ef5466e NB |
97 | int pi_prot_type = dev->dev_attrib.pi_prot_type; |
98 | ||
a50da144 PB |
99 | unsigned char *rbuf; |
100 | unsigned char buf[32]; | |
1fd032ee CH |
101 | unsigned long long blocks = dev->transport->get_blocks(dev); |
102 | ||
a50da144 | 103 | memset(buf, 0, sizeof(buf)); |
1fd032ee CH |
104 | buf[0] = (blocks >> 56) & 0xff; |
105 | buf[1] = (blocks >> 48) & 0xff; | |
106 | buf[2] = (blocks >> 40) & 0xff; | |
107 | buf[3] = (blocks >> 32) & 0xff; | |
108 | buf[4] = (blocks >> 24) & 0xff; | |
109 | buf[5] = (blocks >> 16) & 0xff; | |
110 | buf[6] = (blocks >> 8) & 0xff; | |
111 | buf[7] = blocks & 0xff; | |
0fd97ccf CH |
112 | buf[8] = (dev->dev_attrib.block_size >> 24) & 0xff; |
113 | buf[9] = (dev->dev_attrib.block_size >> 16) & 0xff; | |
114 | buf[10] = (dev->dev_attrib.block_size >> 8) & 0xff; | |
115 | buf[11] = dev->dev_attrib.block_size & 0xff; | |
56dac14c NB |
116 | /* |
117 | * Set P_TYPE and PROT_EN bits for DIF support | |
118 | */ | |
2d335983 | 119 | if (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) { |
9ef5466e NB |
120 | /* |
121 | * Only override a device's pi_prot_type if no T10-PI is | |
122 | * available, and sess_prot_type has been explicitly enabled. | |
123 | */ | |
124 | if (!pi_prot_type) | |
125 | pi_prot_type = sess->sess_prot_type; | |
126 | ||
127 | if (pi_prot_type) | |
128 | buf[12] = (pi_prot_type - 1) << 1 | 0x1; | |
2d335983 | 129 | } |
7f7caf6a AG |
130 | |
131 | if (dev->transport->get_lbppbe) | |
132 | buf[13] = dev->transport->get_lbppbe(dev) & 0x0f; | |
133 | ||
134 | if (dev->transport->get_alignment_offset_lbas) { | |
135 | u16 lalba = dev->transport->get_alignment_offset_lbas(dev); | |
136 | buf[14] = (lalba >> 8) & 0x3f; | |
137 | buf[15] = lalba & 0xff; | |
138 | } | |
139 | ||
1fd032ee CH |
140 | /* |
141 | * Set Thin Provisioning Enable bit following sbc3r22 in section | |
142 | * READ CAPACITY (16) byte 14 if emulate_tpu or emulate_tpws is enabled. | |
143 | */ | |
0fd97ccf | 144 | if (dev->dev_attrib.emulate_tpu || dev->dev_attrib.emulate_tpws) |
7f7caf6a | 145 | buf[14] |= 0x80; |
1fd032ee | 146 | |
a50da144 | 147 | rbuf = transport_kmap_data_sg(cmd); |
8b4b0dcb NB |
148 | if (rbuf) { |
149 | memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length)); | |
150 | transport_kunmap_data_sg(cmd); | |
151 | } | |
1fd032ee | 152 | |
2426bd45 | 153 | target_complete_cmd_with_length(cmd, GOOD, 32); |
1fd032ee CH |
154 | return 0; |
155 | } | |
156 | ||
972b29c8 | 157 | sector_t sbc_get_write_same_sectors(struct se_cmd *cmd) |
1fd032ee | 158 | { |
1fd032ee | 159 | u32 num_blocks; |
1fd032ee CH |
160 | |
161 | if (cmd->t_task_cdb[0] == WRITE_SAME) | |
162 | num_blocks = get_unaligned_be16(&cmd->t_task_cdb[7]); | |
163 | else if (cmd->t_task_cdb[0] == WRITE_SAME_16) | |
164 | num_blocks = get_unaligned_be32(&cmd->t_task_cdb[10]); | |
165 | else /* WRITE_SAME_32 via VARIABLE_LENGTH_CMD */ | |
166 | num_blocks = get_unaligned_be32(&cmd->t_task_cdb[28]); | |
167 | ||
168 | /* | |
169 | * Use the explicit range when non zero is supplied, otherwise calculate | |
170 | * the remaining range based on ->get_blocks() - starting LBA. | |
171 | */ | |
6f974e8c CH |
172 | if (num_blocks) |
173 | return num_blocks; | |
1fd032ee | 174 | |
6f974e8c CH |
175 | return cmd->se_dev->transport->get_blocks(cmd->se_dev) - |
176 | cmd->t_task_lba + 1; | |
1fd032ee | 177 | } |
972b29c8 | 178 | EXPORT_SYMBOL(sbc_get_write_same_sectors); |
1fd032ee | 179 | |
b753d643 CH |
180 | static sense_reason_t |
181 | sbc_execute_write_same_unmap(struct se_cmd *cmd) | |
182 | { | |
183 | struct sbc_ops *ops = cmd->protocol_data; | |
184 | sector_t nolb = sbc_get_write_same_sectors(cmd); | |
185 | sense_reason_t ret; | |
186 | ||
187 | if (nolb) { | |
188 | ret = ops->execute_unmap(cmd, cmd->t_task_lba, nolb); | |
189 | if (ret) | |
190 | return ret; | |
191 | } | |
192 | ||
193 | target_complete_cmd(cmd, GOOD); | |
194 | return 0; | |
195 | } | |
196 | ||
de103c93 | 197 | static sense_reason_t |
1920ed61 | 198 | sbc_emulate_noop(struct se_cmd *cmd) |
1a1ff38c BK |
199 | { |
200 | target_complete_cmd(cmd, GOOD); | |
201 | return 0; | |
202 | } | |
203 | ||
d6e0175c CH |
204 | static inline u32 sbc_get_size(struct se_cmd *cmd, u32 sectors) |
205 | { | |
0fd97ccf | 206 | return cmd->se_dev->dev_attrib.block_size * sectors; |
d6e0175c CH |
207 | } |
208 | ||
d6e0175c CH |
209 | static inline u32 transport_get_sectors_6(unsigned char *cdb) |
210 | { | |
211 | /* | |
212 | * Use 8-bit sector value. SBC-3 says: | |
213 | * | |
214 | * A TRANSFER LENGTH field set to zero specifies that 256 | |
215 | * logical blocks shall be written. Any other value | |
216 | * specifies the number of logical blocks that shall be | |
217 | * written. | |
218 | */ | |
219 | return cdb[4] ? : 256; | |
220 | } | |
221 | ||
222 | static inline u32 transport_get_sectors_10(unsigned char *cdb) | |
223 | { | |
224 | return (u32)(cdb[7] << 8) + cdb[8]; | |
225 | } | |
226 | ||
227 | static inline u32 transport_get_sectors_12(unsigned char *cdb) | |
228 | { | |
229 | return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9]; | |
230 | } | |
231 | ||
232 | static inline u32 transport_get_sectors_16(unsigned char *cdb) | |
233 | { | |
234 | return (u32)(cdb[10] << 24) + (cdb[11] << 16) + | |
235 | (cdb[12] << 8) + cdb[13]; | |
236 | } | |
237 | ||
238 | /* | |
239 | * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants | |
240 | */ | |
241 | static inline u32 transport_get_sectors_32(unsigned char *cdb) | |
242 | { | |
243 | return (u32)(cdb[28] << 24) + (cdb[29] << 16) + | |
244 | (cdb[30] << 8) + cdb[31]; | |
245 | ||
246 | } | |
247 | ||
248 | static inline u32 transport_lba_21(unsigned char *cdb) | |
249 | { | |
250 | return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3]; | |
251 | } | |
252 | ||
253 | static inline u32 transport_lba_32(unsigned char *cdb) | |
254 | { | |
255 | return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5]; | |
256 | } | |
257 | ||
258 | static inline unsigned long long transport_lba_64(unsigned char *cdb) | |
259 | { | |
260 | unsigned int __v1, __v2; | |
261 | ||
262 | __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5]; | |
263 | __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9]; | |
264 | ||
265 | return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; | |
266 | } | |
267 | ||
268 | /* | |
269 | * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs | |
270 | */ | |
271 | static inline unsigned long long transport_lba_64_ext(unsigned char *cdb) | |
272 | { | |
273 | unsigned int __v1, __v2; | |
274 | ||
275 | __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15]; | |
276 | __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19]; | |
277 | ||
278 | return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; | |
279 | } | |
280 | ||
cd063bef NB |
281 | static sense_reason_t |
282 | sbc_setup_write_same(struct se_cmd *cmd, unsigned char *flags, struct sbc_ops *ops) | |
d6e0175c | 283 | { |
8e575c50 NB |
284 | struct se_device *dev = cmd->se_dev; |
285 | sector_t end_lba = dev->transport->get_blocks(dev) + 1; | |
972b29c8 | 286 | unsigned int sectors = sbc_get_write_same_sectors(cmd); |
afd73f1b | 287 | sense_reason_t ret; |
773cbaf7 | 288 | |
d6e0175c CH |
289 | if ((flags[0] & 0x04) || (flags[0] & 0x02)) { |
290 | pr_err("WRITE_SAME PBDATA and LBDATA" | |
291 | " bits not supported for Block Discard" | |
292 | " Emulation\n"); | |
cd063bef | 293 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
d6e0175c | 294 | } |
773cbaf7 NB |
295 | if (sectors > cmd->se_dev->dev_attrib.max_write_same_len) { |
296 | pr_warn("WRITE_SAME sectors: %u exceeds max_write_same_len: %u\n", | |
297 | sectors, cmd->se_dev->dev_attrib.max_write_same_len); | |
298 | return TCM_INVALID_CDB_FIELD; | |
299 | } | |
8e575c50 NB |
300 | /* |
301 | * Sanity check for LBA wrap and request past end of device. | |
302 | */ | |
303 | if (((cmd->t_task_lba + sectors) < cmd->t_task_lba) || | |
304 | ((cmd->t_task_lba + sectors) > end_lba)) { | |
305 | pr_err("WRITE_SAME exceeds last lba %llu (lba %llu, sectors %u)\n", | |
306 | (unsigned long long)end_lba, cmd->t_task_lba, sectors); | |
307 | return TCM_ADDRESS_OUT_OF_RANGE; | |
308 | } | |
309 | ||
5cb770bf RD |
310 | /* We always have ANC_SUP == 0 so setting ANCHOR is always an error */ |
311 | if (flags[0] & 0x10) { | |
312 | pr_warn("WRITE SAME with ANCHOR not supported\n"); | |
313 | return TCM_INVALID_CDB_FIELD; | |
314 | } | |
d6e0175c | 315 | /* |
cd063bef NB |
316 | * Special case for WRITE_SAME w/ UNMAP=1 that ends up getting |
317 | * translated into block discard requests within backend code. | |
d6e0175c | 318 | */ |
cd063bef | 319 | if (flags[0] & 0x08) { |
b753d643 | 320 | if (!ops->execute_unmap) |
cd063bef NB |
321 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
322 | ||
d0a91295 NB |
323 | if (!dev->dev_attrib.emulate_tpws) { |
324 | pr_err("Got WRITE_SAME w/ UNMAP=1, but backend device" | |
325 | " has emulate_tpws disabled\n"); | |
326 | return TCM_UNSUPPORTED_SCSI_OPCODE; | |
327 | } | |
b753d643 | 328 | cmd->execute_cmd = sbc_execute_write_same_unmap; |
cd063bef | 329 | return 0; |
d6e0175c | 330 | } |
cd063bef NB |
331 | if (!ops->execute_write_same) |
332 | return TCM_UNSUPPORTED_SCSI_OPCODE; | |
d6e0175c | 333 | |
afd73f1b NB |
334 | ret = sbc_check_prot(dev, cmd, &cmd->t_task_cdb[0], sectors, true); |
335 | if (ret) | |
336 | return ret; | |
337 | ||
cd063bef | 338 | cmd->execute_cmd = ops->execute_write_same; |
d6e0175c CH |
339 | return 0; |
340 | } | |
341 | ||
c8e63985 | 342 | static sense_reason_t xdreadwrite_callback(struct se_cmd *cmd, bool success) |
d6e0175c CH |
343 | { |
344 | unsigned char *buf, *addr; | |
345 | struct scatterlist *sg; | |
346 | unsigned int offset; | |
a6b0133c NB |
347 | sense_reason_t ret = TCM_NO_SENSE; |
348 | int i, count; | |
d6e0175c CH |
349 | /* |
350 | * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command | |
351 | * | |
352 | * 1) read the specified logical block(s); | |
353 | * 2) transfer logical blocks from the data-out buffer; | |
354 | * 3) XOR the logical blocks transferred from the data-out buffer with | |
355 | * the logical blocks read, storing the resulting XOR data in a buffer; | |
356 | * 4) if the DISABLE WRITE bit is set to zero, then write the logical | |
357 | * blocks transferred from the data-out buffer; and | |
358 | * 5) transfer the resulting XOR data to the data-in buffer. | |
359 | */ | |
360 | buf = kmalloc(cmd->data_length, GFP_KERNEL); | |
361 | if (!buf) { | |
362 | pr_err("Unable to allocate xor_callback buf\n"); | |
a6b0133c | 363 | return TCM_OUT_OF_RESOURCES; |
d6e0175c CH |
364 | } |
365 | /* | |
366 | * Copy the scatterlist WRITE buffer located at cmd->t_data_sg | |
367 | * into the locally allocated *buf | |
368 | */ | |
369 | sg_copy_to_buffer(cmd->t_data_sg, | |
370 | cmd->t_data_nents, | |
371 | buf, | |
372 | cmd->data_length); | |
373 | ||
374 | /* | |
375 | * Now perform the XOR against the BIDI read memory located at | |
376 | * cmd->t_mem_bidi_list | |
377 | */ | |
378 | ||
379 | offset = 0; | |
380 | for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) { | |
381 | addr = kmap_atomic(sg_page(sg)); | |
a6b0133c NB |
382 | if (!addr) { |
383 | ret = TCM_OUT_OF_RESOURCES; | |
d6e0175c | 384 | goto out; |
a6b0133c | 385 | } |
d6e0175c CH |
386 | |
387 | for (i = 0; i < sg->length; i++) | |
388 | *(addr + sg->offset + i) ^= *(buf + offset + i); | |
389 | ||
390 | offset += sg->length; | |
391 | kunmap_atomic(addr); | |
392 | } | |
393 | ||
394 | out: | |
395 | kfree(buf); | |
a6b0133c | 396 | return ret; |
d6e0175c CH |
397 | } |
398 | ||
a82a9538 NB |
399 | static sense_reason_t |
400 | sbc_execute_rw(struct se_cmd *cmd) | |
401 | { | |
7a971b1b CH |
402 | struct sbc_ops *ops = cmd->protocol_data; |
403 | ||
404 | return ops->execute_rw(cmd, cmd->t_data_sg, cmd->t_data_nents, | |
a82a9538 NB |
405 | cmd->data_direction); |
406 | } | |
407 | ||
c8e63985 | 408 | static sense_reason_t compare_and_write_post(struct se_cmd *cmd, bool success) |
68ff9b9b NB |
409 | { |
410 | struct se_device *dev = cmd->se_dev; | |
411 | ||
d8855c15 NB |
412 | /* |
413 | * Only set SCF_COMPARE_AND_WRITE_POST to force a response fall-through | |
414 | * within target_complete_ok_work() if the command was successfully | |
415 | * sent to the backend driver. | |
416 | */ | |
417 | spin_lock_irq(&cmd->t_state_lock); | |
418 | if ((cmd->transport_state & CMD_T_SENT) && !cmd->scsi_status) | |
419 | cmd->se_cmd_flags |= SCF_COMPARE_AND_WRITE_POST; | |
420 | spin_unlock_irq(&cmd->t_state_lock); | |
421 | ||
68ff9b9b NB |
422 | /* |
423 | * Unlock ->caw_sem originally obtained during sbc_compare_and_write() | |
424 | * before the original READ I/O submission. | |
425 | */ | |
426 | up(&dev->caw_sem); | |
427 | ||
428 | return TCM_NO_SENSE; | |
429 | } | |
430 | ||
c8e63985 | 431 | static sense_reason_t compare_and_write_callback(struct se_cmd *cmd, bool success) |
68ff9b9b NB |
432 | { |
433 | struct se_device *dev = cmd->se_dev; | |
434 | struct scatterlist *write_sg = NULL, *sg; | |
db60df88 | 435 | unsigned char *buf = NULL, *addr; |
68ff9b9b NB |
436 | struct sg_mapping_iter m; |
437 | unsigned int offset = 0, len; | |
438 | unsigned int nlbas = cmd->t_task_nolb; | |
439 | unsigned int block_size = dev->dev_attrib.block_size; | |
440 | unsigned int compare_len = (nlbas * block_size); | |
441 | sense_reason_t ret = TCM_NO_SENSE; | |
442 | int rc, i; | |
443 | ||
cf6d1f09 NB |
444 | /* |
445 | * Handle early failure in transport_generic_request_failure(), | |
c8e63985 | 446 | * which will not have taken ->caw_sem yet.. |
cf6d1f09 | 447 | */ |
c8e63985 | 448 | if (!success && (!cmd->t_data_sg || !cmd->t_bidi_data_sg)) |
cf6d1f09 | 449 | return TCM_NO_SENSE; |
c8e63985 NB |
450 | /* |
451 | * Handle special case for zero-length COMPARE_AND_WRITE | |
452 | */ | |
453 | if (!cmd->data_length) | |
454 | goto out; | |
db60df88 NB |
455 | /* |
456 | * Immediately exit + release dev->caw_sem if command has already | |
457 | * been failed with a non-zero SCSI status. | |
458 | */ | |
459 | if (cmd->scsi_status) { | |
460 | pr_err("compare_and_write_callback: non zero scsi_status:" | |
461 | " 0x%02x\n", cmd->scsi_status); | |
462 | goto out; | |
463 | } | |
cf6d1f09 | 464 | |
68ff9b9b NB |
465 | buf = kzalloc(cmd->data_length, GFP_KERNEL); |
466 | if (!buf) { | |
467 | pr_err("Unable to allocate compare_and_write buf\n"); | |
a2890087 NB |
468 | ret = TCM_OUT_OF_RESOURCES; |
469 | goto out; | |
68ff9b9b NB |
470 | } |
471 | ||
a1e1774c | 472 | write_sg = kmalloc(sizeof(struct scatterlist) * cmd->t_data_nents, |
68ff9b9b NB |
473 | GFP_KERNEL); |
474 | if (!write_sg) { | |
475 | pr_err("Unable to allocate compare_and_write sg\n"); | |
476 | ret = TCM_OUT_OF_RESOURCES; | |
477 | goto out; | |
478 | } | |
a1e1774c | 479 | sg_init_table(write_sg, cmd->t_data_nents); |
68ff9b9b NB |
480 | /* |
481 | * Setup verify and write data payloads from total NumberLBAs. | |
482 | */ | |
483 | rc = sg_copy_to_buffer(cmd->t_data_sg, cmd->t_data_nents, buf, | |
484 | cmd->data_length); | |
485 | if (!rc) { | |
486 | pr_err("sg_copy_to_buffer() failed for compare_and_write\n"); | |
487 | ret = TCM_OUT_OF_RESOURCES; | |
488 | goto out; | |
489 | } | |
490 | /* | |
491 | * Compare against SCSI READ payload against verify payload | |
492 | */ | |
493 | for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, i) { | |
494 | addr = (unsigned char *)kmap_atomic(sg_page(sg)); | |
495 | if (!addr) { | |
496 | ret = TCM_OUT_OF_RESOURCES; | |
497 | goto out; | |
498 | } | |
499 | ||
500 | len = min(sg->length, compare_len); | |
501 | ||
502 | if (memcmp(addr, buf + offset, len)) { | |
503 | pr_warn("Detected MISCOMPARE for addr: %p buf: %p\n", | |
504 | addr, buf + offset); | |
505 | kunmap_atomic(addr); | |
506 | goto miscompare; | |
507 | } | |
508 | kunmap_atomic(addr); | |
509 | ||
510 | offset += len; | |
511 | compare_len -= len; | |
512 | if (!compare_len) | |
513 | break; | |
514 | } | |
515 | ||
516 | i = 0; | |
517 | len = cmd->t_task_nolb * block_size; | |
518 | sg_miter_start(&m, cmd->t_data_sg, cmd->t_data_nents, SG_MITER_TO_SG); | |
519 | /* | |
520 | * Currently assumes NoLB=1 and SGLs are PAGE_SIZE.. | |
521 | */ | |
522 | while (len) { | |
523 | sg_miter_next(&m); | |
524 | ||
525 | if (block_size < PAGE_SIZE) { | |
526 | sg_set_page(&write_sg[i], m.page, block_size, | |
527 | block_size); | |
528 | } else { | |
529 | sg_miter_next(&m); | |
530 | sg_set_page(&write_sg[i], m.page, block_size, | |
531 | 0); | |
532 | } | |
533 | len -= block_size; | |
534 | i++; | |
535 | } | |
536 | sg_miter_stop(&m); | |
537 | /* | |
538 | * Save the original SGL + nents values before updating to new | |
539 | * assignments, to be released in transport_free_pages() -> | |
540 | * transport_reset_sgl_orig() | |
541 | */ | |
542 | cmd->t_data_sg_orig = cmd->t_data_sg; | |
543 | cmd->t_data_sg = write_sg; | |
544 | cmd->t_data_nents_orig = cmd->t_data_nents; | |
545 | cmd->t_data_nents = 1; | |
546 | ||
68d81f40 | 547 | cmd->sam_task_attr = TCM_HEAD_TAG; |
68ff9b9b NB |
548 | cmd->transport_complete_callback = compare_and_write_post; |
549 | /* | |
550 | * Now reset ->execute_cmd() to the normal sbc_execute_rw() handler | |
551 | * for submitting the adjusted SGL to write instance user-data. | |
552 | */ | |
553 | cmd->execute_cmd = sbc_execute_rw; | |
554 | ||
555 | spin_lock_irq(&cmd->t_state_lock); | |
556 | cmd->t_state = TRANSPORT_PROCESSING; | |
557 | cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT; | |
558 | spin_unlock_irq(&cmd->t_state_lock); | |
559 | ||
560 | __target_execute_cmd(cmd); | |
561 | ||
562 | kfree(buf); | |
563 | return ret; | |
564 | ||
565 | miscompare: | |
566 | pr_warn("Target/%s: Send MISCOMPARE check condition and sense\n", | |
567 | dev->transport->name); | |
568 | ret = TCM_MISCOMPARE_VERIFY; | |
569 | out: | |
570 | /* | |
571 | * In the MISCOMPARE or failure case, unlock ->caw_sem obtained in | |
572 | * sbc_compare_and_write() before the original READ I/O submission. | |
573 | */ | |
574 | up(&dev->caw_sem); | |
575 | kfree(write_sg); | |
576 | kfree(buf); | |
577 | return ret; | |
578 | } | |
579 | ||
580 | static sense_reason_t | |
581 | sbc_compare_and_write(struct se_cmd *cmd) | |
582 | { | |
7a971b1b | 583 | struct sbc_ops *ops = cmd->protocol_data; |
68ff9b9b NB |
584 | struct se_device *dev = cmd->se_dev; |
585 | sense_reason_t ret; | |
586 | int rc; | |
587 | /* | |
588 | * Submit the READ first for COMPARE_AND_WRITE to perform the | |
589 | * comparision using SGLs at cmd->t_bidi_data_sg.. | |
590 | */ | |
591 | rc = down_interruptible(&dev->caw_sem); | |
ee7619f2 | 592 | if (rc != 0) { |
68ff9b9b NB |
593 | cmd->transport_complete_callback = NULL; |
594 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
595 | } | |
b7191253 NB |
596 | /* |
597 | * Reset cmd->data_length to individual block_size in order to not | |
598 | * confuse backend drivers that depend on this value matching the | |
599 | * size of the I/O being submitted. | |
600 | */ | |
601 | cmd->data_length = cmd->t_task_nolb * dev->dev_attrib.block_size; | |
68ff9b9b | 602 | |
7a971b1b | 603 | ret = ops->execute_rw(cmd, cmd->t_bidi_data_sg, cmd->t_bidi_data_nents, |
68ff9b9b NB |
604 | DMA_FROM_DEVICE); |
605 | if (ret) { | |
606 | cmd->transport_complete_callback = NULL; | |
607 | up(&dev->caw_sem); | |
608 | return ret; | |
609 | } | |
610 | /* | |
611 | * Unlock of dev->caw_sem to occur in compare_and_write_callback() | |
612 | * upon MISCOMPARE, or in compare_and_write_done() upon completion | |
613 | * of WRITE instance user-data. | |
614 | */ | |
615 | return TCM_NO_SENSE; | |
616 | } | |
617 | ||
19f9361a | 618 | static int |
38b57f82 | 619 | sbc_set_prot_op_checks(u8 protect, bool fabric_prot, enum target_prot_type prot_type, |
19f9361a SG |
620 | bool is_write, struct se_cmd *cmd) |
621 | { | |
622 | if (is_write) { | |
38b57f82 NB |
623 | cmd->prot_op = fabric_prot ? TARGET_PROT_DOUT_STRIP : |
624 | protect ? TARGET_PROT_DOUT_PASS : | |
625 | TARGET_PROT_DOUT_INSERT; | |
19f9361a SG |
626 | switch (protect) { |
627 | case 0x0: | |
628 | case 0x3: | |
629 | cmd->prot_checks = 0; | |
630 | break; | |
631 | case 0x1: | |
632 | case 0x5: | |
633 | cmd->prot_checks = TARGET_DIF_CHECK_GUARD; | |
634 | if (prot_type == TARGET_DIF_TYPE1_PROT) | |
635 | cmd->prot_checks |= TARGET_DIF_CHECK_REFTAG; | |
636 | break; | |
637 | case 0x2: | |
638 | if (prot_type == TARGET_DIF_TYPE1_PROT) | |
639 | cmd->prot_checks = TARGET_DIF_CHECK_REFTAG; | |
640 | break; | |
641 | case 0x4: | |
642 | cmd->prot_checks = TARGET_DIF_CHECK_GUARD; | |
643 | break; | |
644 | default: | |
645 | pr_err("Unsupported protect field %d\n", protect); | |
646 | return -EINVAL; | |
647 | } | |
648 | } else { | |
38b57f82 NB |
649 | cmd->prot_op = fabric_prot ? TARGET_PROT_DIN_INSERT : |
650 | protect ? TARGET_PROT_DIN_PASS : | |
651 | TARGET_PROT_DIN_STRIP; | |
19f9361a SG |
652 | switch (protect) { |
653 | case 0x0: | |
654 | case 0x1: | |
655 | case 0x5: | |
656 | cmd->prot_checks = TARGET_DIF_CHECK_GUARD; | |
657 | if (prot_type == TARGET_DIF_TYPE1_PROT) | |
658 | cmd->prot_checks |= TARGET_DIF_CHECK_REFTAG; | |
659 | break; | |
660 | case 0x2: | |
661 | if (prot_type == TARGET_DIF_TYPE1_PROT) | |
662 | cmd->prot_checks = TARGET_DIF_CHECK_REFTAG; | |
663 | break; | |
664 | case 0x3: | |
665 | cmd->prot_checks = 0; | |
666 | break; | |
667 | case 0x4: | |
668 | cmd->prot_checks = TARGET_DIF_CHECK_GUARD; | |
669 | break; | |
670 | default: | |
671 | pr_err("Unsupported protect field %d\n", protect); | |
672 | return -EINVAL; | |
673 | } | |
674 | } | |
675 | ||
676 | return 0; | |
677 | } | |
678 | ||
f7b7c06f | 679 | static sense_reason_t |
499bf77b | 680 | sbc_check_prot(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb, |
19f9361a | 681 | u32 sectors, bool is_write) |
499bf77b | 682 | { |
19f9361a | 683 | u8 protect = cdb[1] >> 5; |
38b57f82 NB |
684 | int sp_ops = cmd->se_sess->sup_prot_ops; |
685 | int pi_prot_type = dev->dev_attrib.pi_prot_type; | |
686 | bool fabric_prot = false; | |
19f9361a | 687 | |
f7b7c06f | 688 | if (!cmd->t_prot_sg || !cmd->t_prot_nents) { |
38b57f82 NB |
689 | if (unlikely(protect && |
690 | !dev->dev_attrib.pi_prot_type && !cmd->se_sess->sess_prot_type)) { | |
691 | pr_err("CDB contains protect bit, but device + fabric does" | |
692 | " not advertise PROTECT=1 feature bit\n"); | |
f7b7c06f NB |
693 | return TCM_INVALID_CDB_FIELD; |
694 | } | |
695 | if (cmd->prot_pto) | |
696 | return TCM_NO_SENSE; | |
697 | } | |
499bf77b NB |
698 | |
699 | switch (dev->dev_attrib.pi_prot_type) { | |
700 | case TARGET_DIF_TYPE3_PROT: | |
499bf77b NB |
701 | cmd->reftag_seed = 0xffffffff; |
702 | break; | |
703 | case TARGET_DIF_TYPE2_PROT: | |
19f9361a | 704 | if (protect) |
f7b7c06f | 705 | return TCM_INVALID_CDB_FIELD; |
499bf77b NB |
706 | |
707 | cmd->reftag_seed = cmd->t_task_lba; | |
708 | break; | |
709 | case TARGET_DIF_TYPE1_PROT: | |
499bf77b NB |
710 | cmd->reftag_seed = cmd->t_task_lba; |
711 | break; | |
712 | case TARGET_DIF_TYPE0_PROT: | |
38b57f82 NB |
713 | /* |
714 | * See if the fabric supports T10-PI, and the session has been | |
715 | * configured to allow export PROTECT=1 feature bit with backend | |
716 | * devices that don't support T10-PI. | |
717 | */ | |
718 | fabric_prot = is_write ? | |
719 | !!(sp_ops & (TARGET_PROT_DOUT_PASS | TARGET_PROT_DOUT_STRIP)) : | |
720 | !!(sp_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DIN_INSERT)); | |
721 | ||
722 | if (fabric_prot && cmd->se_sess->sess_prot_type) { | |
723 | pi_prot_type = cmd->se_sess->sess_prot_type; | |
724 | break; | |
725 | } | |
cceca4a6 NB |
726 | if (!protect) |
727 | return TCM_NO_SENSE; | |
38b57f82 | 728 | /* Fallthrough */ |
499bf77b | 729 | default: |
cceca4a6 NB |
730 | pr_err("Unable to determine pi_prot_type for CDB: 0x%02x " |
731 | "PROTECT: 0x%02x\n", cdb[0], protect); | |
732 | return TCM_INVALID_CDB_FIELD; | |
499bf77b NB |
733 | } |
734 | ||
38b57f82 | 735 | if (sbc_set_prot_op_checks(protect, fabric_prot, pi_prot_type, is_write, cmd)) |
f7b7c06f | 736 | return TCM_INVALID_CDB_FIELD; |
19f9361a | 737 | |
38b57f82 | 738 | cmd->prot_type = pi_prot_type; |
499bf77b | 739 | cmd->prot_length = dev->prot_length * sectors; |
e2a4f55c SG |
740 | |
741 | /** | |
742 | * In case protection information exists over the wire | |
743 | * we modify command data length to describe pure data. | |
744 | * The actual transfer length is data length + protection | |
745 | * length | |
746 | **/ | |
747 | if (protect) | |
748 | cmd->data_length = sectors * dev->dev_attrib.block_size; | |
749 | ||
750 | pr_debug("%s: prot_type=%d, data_length=%d, prot_length=%d " | |
751 | "prot_op=%d prot_checks=%d\n", | |
752 | __func__, cmd->prot_type, cmd->data_length, cmd->prot_length, | |
03abad9e | 753 | cmd->prot_op, cmd->prot_checks); |
499bf77b | 754 | |
f7b7c06f | 755 | return TCM_NO_SENSE; |
499bf77b NB |
756 | } |
757 | ||
fde9f50f NB |
758 | static int |
759 | sbc_check_dpofua(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb) | |
760 | { | |
761 | if (cdb[1] & 0x10) { | |
814e5b45 CH |
762 | /* see explanation in spc_emulate_modesense */ |
763 | if (!target_check_fua(dev)) { | |
fde9f50f NB |
764 | pr_err("Got CDB: 0x%02x with DPO bit set, but device" |
765 | " does not advertise support for DPO\n", cdb[0]); | |
766 | return -EINVAL; | |
767 | } | |
768 | } | |
769 | if (cdb[1] & 0x8) { | |
814e5b45 | 770 | if (!target_check_fua(dev)) { |
fde9f50f NB |
771 | pr_err("Got CDB: 0x%02x with FUA bit set, but device" |
772 | " does not advertise support for FUA write\n", | |
773 | cdb[0]); | |
774 | return -EINVAL; | |
775 | } | |
776 | cmd->se_cmd_flags |= SCF_FUA; | |
777 | } | |
778 | return 0; | |
499bf77b NB |
779 | } |
780 | ||
de103c93 CH |
781 | sense_reason_t |
782 | sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops) | |
d6e0175c | 783 | { |
d6e0175c CH |
784 | struct se_device *dev = cmd->se_dev; |
785 | unsigned char *cdb = cmd->t_task_cdb; | |
1fd032ee | 786 | unsigned int size; |
d6e0175c | 787 | u32 sectors = 0; |
de103c93 | 788 | sense_reason_t ret; |
d6e0175c | 789 | |
7a971b1b CH |
790 | cmd->protocol_data = ops; |
791 | ||
d6e0175c CH |
792 | switch (cdb[0]) { |
793 | case READ_6: | |
794 | sectors = transport_get_sectors_6(cdb); | |
795 | cmd->t_task_lba = transport_lba_21(cdb); | |
796 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
a82a9538 | 797 | cmd->execute_cmd = sbc_execute_rw; |
d6e0175c CH |
798 | break; |
799 | case READ_10: | |
800 | sectors = transport_get_sectors_10(cdb); | |
801 | cmd->t_task_lba = transport_lba_32(cdb); | |
499bf77b | 802 | |
fde9f50f NB |
803 | if (sbc_check_dpofua(dev, cmd, cdb)) |
804 | return TCM_INVALID_CDB_FIELD; | |
805 | ||
f7b7c06f NB |
806 | ret = sbc_check_prot(dev, cmd, cdb, sectors, false); |
807 | if (ret) | |
808 | return ret; | |
499bf77b | 809 | |
d6e0175c | 810 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
a82a9538 | 811 | cmd->execute_cmd = sbc_execute_rw; |
d6e0175c CH |
812 | break; |
813 | case READ_12: | |
814 | sectors = transport_get_sectors_12(cdb); | |
815 | cmd->t_task_lba = transport_lba_32(cdb); | |
499bf77b | 816 | |
fde9f50f NB |
817 | if (sbc_check_dpofua(dev, cmd, cdb)) |
818 | return TCM_INVALID_CDB_FIELD; | |
819 | ||
f7b7c06f NB |
820 | ret = sbc_check_prot(dev, cmd, cdb, sectors, false); |
821 | if (ret) | |
822 | return ret; | |
499bf77b | 823 | |
d6e0175c | 824 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
a82a9538 | 825 | cmd->execute_cmd = sbc_execute_rw; |
d6e0175c CH |
826 | break; |
827 | case READ_16: | |
828 | sectors = transport_get_sectors_16(cdb); | |
829 | cmd->t_task_lba = transport_lba_64(cdb); | |
499bf77b | 830 | |
fde9f50f NB |
831 | if (sbc_check_dpofua(dev, cmd, cdb)) |
832 | return TCM_INVALID_CDB_FIELD; | |
833 | ||
f7b7c06f NB |
834 | ret = sbc_check_prot(dev, cmd, cdb, sectors, false); |
835 | if (ret) | |
836 | return ret; | |
499bf77b | 837 | |
d6e0175c | 838 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
a82a9538 | 839 | cmd->execute_cmd = sbc_execute_rw; |
d6e0175c CH |
840 | break; |
841 | case WRITE_6: | |
842 | sectors = transport_get_sectors_6(cdb); | |
843 | cmd->t_task_lba = transport_lba_21(cdb); | |
844 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
a82a9538 | 845 | cmd->execute_cmd = sbc_execute_rw; |
d6e0175c CH |
846 | break; |
847 | case WRITE_10: | |
848 | case WRITE_VERIFY: | |
849 | sectors = transport_get_sectors_10(cdb); | |
850 | cmd->t_task_lba = transport_lba_32(cdb); | |
499bf77b | 851 | |
fde9f50f NB |
852 | if (sbc_check_dpofua(dev, cmd, cdb)) |
853 | return TCM_INVALID_CDB_FIELD; | |
854 | ||
f7b7c06f NB |
855 | ret = sbc_check_prot(dev, cmd, cdb, sectors, true); |
856 | if (ret) | |
857 | return ret; | |
499bf77b | 858 | |
d6e0175c | 859 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
a82a9538 | 860 | cmd->execute_cmd = sbc_execute_rw; |
d6e0175c CH |
861 | break; |
862 | case WRITE_12: | |
863 | sectors = transport_get_sectors_12(cdb); | |
864 | cmd->t_task_lba = transport_lba_32(cdb); | |
499bf77b | 865 | |
fde9f50f NB |
866 | if (sbc_check_dpofua(dev, cmd, cdb)) |
867 | return TCM_INVALID_CDB_FIELD; | |
868 | ||
f7b7c06f NB |
869 | ret = sbc_check_prot(dev, cmd, cdb, sectors, true); |
870 | if (ret) | |
871 | return ret; | |
499bf77b | 872 | |
d6e0175c | 873 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
a82a9538 | 874 | cmd->execute_cmd = sbc_execute_rw; |
d6e0175c CH |
875 | break; |
876 | case WRITE_16: | |
877 | sectors = transport_get_sectors_16(cdb); | |
878 | cmd->t_task_lba = transport_lba_64(cdb); | |
499bf77b | 879 | |
fde9f50f NB |
880 | if (sbc_check_dpofua(dev, cmd, cdb)) |
881 | return TCM_INVALID_CDB_FIELD; | |
882 | ||
f7b7c06f NB |
883 | ret = sbc_check_prot(dev, cmd, cdb, sectors, true); |
884 | if (ret) | |
885 | return ret; | |
499bf77b | 886 | |
d6e0175c | 887 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
a82a9538 | 888 | cmd->execute_cmd = sbc_execute_rw; |
d6e0175c CH |
889 | break; |
890 | case XDWRITEREAD_10: | |
de103c93 | 891 | if (cmd->data_direction != DMA_TO_DEVICE || |
d6e0175c | 892 | !(cmd->se_cmd_flags & SCF_BIDI)) |
de103c93 | 893 | return TCM_INVALID_CDB_FIELD; |
d6e0175c CH |
894 | sectors = transport_get_sectors_10(cdb); |
895 | ||
fde9f50f NB |
896 | if (sbc_check_dpofua(dev, cmd, cdb)) |
897 | return TCM_INVALID_CDB_FIELD; | |
898 | ||
d6e0175c CH |
899 | cmd->t_task_lba = transport_lba_32(cdb); |
900 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
901 | ||
902 | /* | |
903 | * Setup BIDI XOR callback to be run after I/O completion. | |
904 | */ | |
a82a9538 | 905 | cmd->execute_cmd = sbc_execute_rw; |
d6e0175c | 906 | cmd->transport_complete_callback = &xdreadwrite_callback; |
d6e0175c CH |
907 | break; |
908 | case VARIABLE_LENGTH_CMD: | |
909 | { | |
910 | u16 service_action = get_unaligned_be16(&cdb[8]); | |
911 | switch (service_action) { | |
912 | case XDWRITEREAD_32: | |
913 | sectors = transport_get_sectors_32(cdb); | |
914 | ||
fde9f50f NB |
915 | if (sbc_check_dpofua(dev, cmd, cdb)) |
916 | return TCM_INVALID_CDB_FIELD; | |
d6e0175c CH |
917 | /* |
918 | * Use WRITE_32 and READ_32 opcodes for the emulated | |
919 | * XDWRITE_READ_32 logic. | |
920 | */ | |
921 | cmd->t_task_lba = transport_lba_64_ext(cdb); | |
922 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
923 | ||
924 | /* | |
925 | * Setup BIDI XOR callback to be run during after I/O | |
926 | * completion. | |
927 | */ | |
a82a9538 | 928 | cmd->execute_cmd = sbc_execute_rw; |
d6e0175c | 929 | cmd->transport_complete_callback = &xdreadwrite_callback; |
d6e0175c CH |
930 | break; |
931 | case WRITE_SAME_32: | |
932 | sectors = transport_get_sectors_32(cdb); | |
933 | if (!sectors) { | |
934 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not" | |
935 | " supported\n"); | |
de103c93 | 936 | return TCM_INVALID_CDB_FIELD; |
d6e0175c CH |
937 | } |
938 | ||
1fd032ee | 939 | size = sbc_get_size(cmd, 1); |
d6e0175c CH |
940 | cmd->t_task_lba = get_unaligned_be64(&cdb[12]); |
941 | ||
cd063bef | 942 | ret = sbc_setup_write_same(cmd, &cdb[10], ops); |
6b64e1fe | 943 | if (ret) |
cd063bef | 944 | return ret; |
d6e0175c CH |
945 | break; |
946 | default: | |
947 | pr_err("VARIABLE_LENGTH_CMD service action" | |
948 | " 0x%04x not supported\n", service_action); | |
de103c93 | 949 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
d6e0175c CH |
950 | } |
951 | break; | |
952 | } | |
68ff9b9b NB |
953 | case COMPARE_AND_WRITE: |
954 | sectors = cdb[13]; | |
955 | /* | |
956 | * Currently enforce COMPARE_AND_WRITE for a single sector | |
957 | */ | |
958 | if (sectors > 1) { | |
959 | pr_err("COMPARE_AND_WRITE contains NoLB: %u greater" | |
960 | " than 1\n", sectors); | |
961 | return TCM_INVALID_CDB_FIELD; | |
962 | } | |
963 | /* | |
964 | * Double size because we have two buffers, note that | |
965 | * zero is not an error.. | |
966 | */ | |
967 | size = 2 * sbc_get_size(cmd, sectors); | |
968 | cmd->t_task_lba = get_unaligned_be64(&cdb[2]); | |
969 | cmd->t_task_nolb = sectors; | |
970 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB | SCF_COMPARE_AND_WRITE; | |
68ff9b9b NB |
971 | cmd->execute_cmd = sbc_compare_and_write; |
972 | cmd->transport_complete_callback = compare_and_write_callback; | |
973 | break; | |
d6e0175c | 974 | case READ_CAPACITY: |
1fd032ee CH |
975 | size = READ_CAP_LEN; |
976 | cmd->execute_cmd = sbc_emulate_readcapacity; | |
d6e0175c | 977 | break; |
eb846d9f | 978 | case SERVICE_ACTION_IN_16: |
d6e0175c CH |
979 | switch (cmd->t_task_cdb[1] & 0x1f) { |
980 | case SAI_READ_CAPACITY_16: | |
1fd032ee | 981 | cmd->execute_cmd = sbc_emulate_readcapacity_16; |
d6e0175c | 982 | break; |
c66094bf HR |
983 | case SAI_REPORT_REFERRALS: |
984 | cmd->execute_cmd = target_emulate_report_referrals; | |
985 | break; | |
d6e0175c CH |
986 | default: |
987 | pr_err("Unsupported SA: 0x%02x\n", | |
988 | cmd->t_task_cdb[1] & 0x1f); | |
de103c93 | 989 | return TCM_INVALID_CDB_FIELD; |
d6e0175c | 990 | } |
1fd032ee | 991 | size = (cdb[10] << 24) | (cdb[11] << 16) | |
d6e0175c CH |
992 | (cdb[12] << 8) | cdb[13]; |
993 | break; | |
994 | case SYNCHRONIZE_CACHE: | |
995 | case SYNCHRONIZE_CACHE_16: | |
d6e0175c CH |
996 | if (cdb[0] == SYNCHRONIZE_CACHE) { |
997 | sectors = transport_get_sectors_10(cdb); | |
998 | cmd->t_task_lba = transport_lba_32(cdb); | |
999 | } else { | |
1000 | sectors = transport_get_sectors_16(cdb); | |
1001 | cmd->t_task_lba = transport_lba_64(cdb); | |
1002 | } | |
6ef31dc7 CVB |
1003 | if (ops->execute_sync_cache) { |
1004 | cmd->execute_cmd = ops->execute_sync_cache; | |
1005 | goto check_lba; | |
d6e0175c | 1006 | } |
6ef31dc7 CVB |
1007 | size = 0; |
1008 | cmd->execute_cmd = sbc_emulate_noop; | |
d6e0175c CH |
1009 | break; |
1010 | case UNMAP: | |
14150a6b | 1011 | if (!ops->execute_unmap) |
de103c93 | 1012 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
14150a6b | 1013 | |
61fdb4ac NB |
1014 | if (!dev->dev_attrib.emulate_tpu) { |
1015 | pr_err("Got UNMAP, but backend device has" | |
1016 | " emulate_tpu disabled\n"); | |
1017 | return TCM_UNSUPPORTED_SCSI_OPCODE; | |
1018 | } | |
1fd032ee | 1019 | size = get_unaligned_be16(&cdb[7]); |
62e46942 | 1020 | cmd->execute_cmd = sbc_execute_unmap; |
d6e0175c CH |
1021 | break; |
1022 | case WRITE_SAME_16: | |
1023 | sectors = transport_get_sectors_16(cdb); | |
1024 | if (!sectors) { | |
1025 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); | |
de103c93 | 1026 | return TCM_INVALID_CDB_FIELD; |
d6e0175c CH |
1027 | } |
1028 | ||
1fd032ee | 1029 | size = sbc_get_size(cmd, 1); |
d6e0175c CH |
1030 | cmd->t_task_lba = get_unaligned_be64(&cdb[2]); |
1031 | ||
cd063bef | 1032 | ret = sbc_setup_write_same(cmd, &cdb[1], ops); |
6b64e1fe | 1033 | if (ret) |
cd063bef | 1034 | return ret; |
d6e0175c CH |
1035 | break; |
1036 | case WRITE_SAME: | |
1037 | sectors = transport_get_sectors_10(cdb); | |
1038 | if (!sectors) { | |
1039 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); | |
de103c93 | 1040 | return TCM_INVALID_CDB_FIELD; |
d6e0175c CH |
1041 | } |
1042 | ||
1fd032ee | 1043 | size = sbc_get_size(cmd, 1); |
d6e0175c CH |
1044 | cmd->t_task_lba = get_unaligned_be32(&cdb[2]); |
1045 | ||
1046 | /* | |
1047 | * Follow sbcr26 with WRITE_SAME (10) and check for the existence | |
1048 | * of byte 1 bit 3 UNMAP instead of original reserved field | |
1049 | */ | |
cd063bef | 1050 | ret = sbc_setup_write_same(cmd, &cdb[1], ops); |
6b64e1fe | 1051 | if (ret) |
cd063bef | 1052 | return ret; |
d6e0175c CH |
1053 | break; |
1054 | case VERIFY: | |
1fd032ee | 1055 | size = 0; |
c52716de CVB |
1056 | sectors = transport_get_sectors_10(cdb); |
1057 | cmd->t_task_lba = transport_lba_32(cdb); | |
1920ed61 | 1058 | cmd->execute_cmd = sbc_emulate_noop; |
c52716de | 1059 | goto check_lba; |
1a1ff38c BK |
1060 | case REZERO_UNIT: |
1061 | case SEEK_6: | |
1062 | case SEEK_10: | |
1063 | /* | |
1064 | * There are still clients out there which use these old SCSI-2 | |
1065 | * commands. This mainly happens when running VMs with legacy | |
1066 | * guest systems, connected via SCSI command pass-through to | |
1067 | * iSCSI targets. Make them happy and return status GOOD. | |
1068 | */ | |
1069 | size = 0; | |
1070 | cmd->execute_cmd = sbc_emulate_noop; | |
1071 | break; | |
d6e0175c | 1072 | default: |
1fd032ee | 1073 | ret = spc_parse_cdb(cmd, &size); |
d6e0175c CH |
1074 | if (ret) |
1075 | return ret; | |
1076 | } | |
1077 | ||
1078 | /* reject any command that we don't have a handler for */ | |
20959c4b | 1079 | if (!cmd->execute_cmd) |
de103c93 | 1080 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
d6e0175c CH |
1081 | |
1082 | if (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) { | |
1fd032ee | 1083 | unsigned long long end_lba; |
6ef31dc7 | 1084 | check_lba: |
1fd032ee | 1085 | end_lba = dev->transport->get_blocks(dev) + 1; |
aa179935 NB |
1086 | if (((cmd->t_task_lba + sectors) < cmd->t_task_lba) || |
1087 | ((cmd->t_task_lba + sectors) > end_lba)) { | |
1fd032ee CH |
1088 | pr_err("cmd exceeds last lba %llu " |
1089 | "(lba %llu, sectors %u)\n", | |
1090 | end_lba, cmd->t_task_lba, sectors); | |
09ceadc7 | 1091 | return TCM_ADDRESS_OUT_OF_RANGE; |
1fd032ee CH |
1092 | } |
1093 | ||
68ff9b9b NB |
1094 | if (!(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) |
1095 | size = sbc_get_size(cmd, sectors); | |
d6e0175c CH |
1096 | } |
1097 | ||
de103c93 | 1098 | return target_cmd_size_check(cmd, size); |
d6e0175c CH |
1099 | } |
1100 | EXPORT_SYMBOL(sbc_parse_cdb); | |
6f23ac8a | 1101 | |
6f23ac8a CH |
1102 | u32 sbc_get_device_type(struct se_device *dev) |
1103 | { | |
1104 | return TYPE_DISK; | |
1105 | } | |
1106 | EXPORT_SYMBOL(sbc_get_device_type); | |
86d71829 | 1107 | |
62e46942 CH |
1108 | static sense_reason_t |
1109 | sbc_execute_unmap(struct se_cmd *cmd) | |
86d71829 | 1110 | { |
62e46942 | 1111 | struct sbc_ops *ops = cmd->protocol_data; |
86d71829 AH |
1112 | struct se_device *dev = cmd->se_dev; |
1113 | unsigned char *buf, *ptr = NULL; | |
1114 | sector_t lba; | |
1115 | int size; | |
1116 | u32 range; | |
1117 | sense_reason_t ret = 0; | |
1118 | int dl, bd_dl; | |
1119 | ||
1120 | /* We never set ANC_SUP */ | |
1121 | if (cmd->t_task_cdb[1]) | |
1122 | return TCM_INVALID_CDB_FIELD; | |
1123 | ||
1124 | if (cmd->data_length == 0) { | |
1125 | target_complete_cmd(cmd, SAM_STAT_GOOD); | |
1126 | return 0; | |
1127 | } | |
1128 | ||
1129 | if (cmd->data_length < 8) { | |
1130 | pr_warn("UNMAP parameter list length %u too small\n", | |
1131 | cmd->data_length); | |
1132 | return TCM_PARAMETER_LIST_LENGTH_ERROR; | |
1133 | } | |
1134 | ||
1135 | buf = transport_kmap_data_sg(cmd); | |
1136 | if (!buf) | |
1137 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
1138 | ||
1139 | dl = get_unaligned_be16(&buf[0]); | |
1140 | bd_dl = get_unaligned_be16(&buf[2]); | |
1141 | ||
1142 | size = cmd->data_length - 8; | |
1143 | if (bd_dl > size) | |
1144 | pr_warn("UNMAP parameter list length %u too small, ignoring bd_dl %u\n", | |
1145 | cmd->data_length, bd_dl); | |
1146 | else | |
1147 | size = bd_dl; | |
1148 | ||
1149 | if (size / 16 > dev->dev_attrib.max_unmap_block_desc_count) { | |
1150 | ret = TCM_INVALID_PARAMETER_LIST; | |
1151 | goto err; | |
1152 | } | |
1153 | ||
1154 | /* First UNMAP block descriptor starts at 8 byte offset */ | |
1155 | ptr = &buf[8]; | |
1156 | pr_debug("UNMAP: Sub: %s Using dl: %u bd_dl: %u size: %u" | |
1157 | " ptr: %p\n", dev->transport->name, dl, bd_dl, size, ptr); | |
1158 | ||
1159 | while (size >= 16) { | |
1160 | lba = get_unaligned_be64(&ptr[0]); | |
1161 | range = get_unaligned_be32(&ptr[8]); | |
1162 | pr_debug("UNMAP: Using lba: %llu and range: %u\n", | |
1163 | (unsigned long long)lba, range); | |
1164 | ||
1165 | if (range > dev->dev_attrib.max_unmap_lba_count) { | |
1166 | ret = TCM_INVALID_PARAMETER_LIST; | |
1167 | goto err; | |
1168 | } | |
1169 | ||
1170 | if (lba + range > dev->transport->get_blocks(dev) + 1) { | |
1171 | ret = TCM_ADDRESS_OUT_OF_RANGE; | |
1172 | goto err; | |
1173 | } | |
1174 | ||
62e46942 | 1175 | ret = ops->execute_unmap(cmd, lba, range); |
86d71829 AH |
1176 | if (ret) |
1177 | goto err; | |
1178 | ||
1179 | ptr += 16; | |
1180 | size -= 16; | |
1181 | } | |
1182 | ||
1183 | err: | |
1184 | transport_kunmap_data_sg(cmd); | |
1185 | if (!ret) | |
1186 | target_complete_cmd(cmd, GOOD); | |
1187 | return ret; | |
1188 | } | |
41861fa8 | 1189 | |
66a3d5bc NB |
1190 | void |
1191 | sbc_dif_generate(struct se_cmd *cmd) | |
1192 | { | |
1193 | struct se_device *dev = cmd->se_dev; | |
fe052a18 | 1194 | struct t10_pi_tuple *sdt; |
18213afb | 1195 | struct scatterlist *dsg = cmd->t_data_sg, *psg; |
66a3d5bc NB |
1196 | sector_t sector = cmd->t_task_lba; |
1197 | void *daddr, *paddr; | |
1198 | int i, j, offset = 0; | |
18213afb | 1199 | unsigned int block_size = dev->dev_attrib.block_size; |
66a3d5bc | 1200 | |
18213afb | 1201 | for_each_sg(cmd->t_prot_sg, psg, cmd->t_prot_nents, i) { |
66a3d5bc | 1202 | paddr = kmap_atomic(sg_page(psg)) + psg->offset; |
18213afb | 1203 | daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; |
66a3d5bc | 1204 | |
18213afb | 1205 | for (j = 0; j < psg->length; |
fe052a18 | 1206 | j += sizeof(*sdt)) { |
18213afb AM |
1207 | __u16 crc; |
1208 | unsigned int avail; | |
66a3d5bc | 1209 | |
18213afb AM |
1210 | if (offset >= dsg->length) { |
1211 | offset -= dsg->length; | |
1212 | kunmap_atomic(daddr - dsg->offset); | |
1213 | dsg = sg_next(dsg); | |
1214 | if (!dsg) { | |
1215 | kunmap_atomic(paddr - psg->offset); | |
1216 | return; | |
1217 | } | |
1218 | daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; | |
66a3d5bc | 1219 | } |
66a3d5bc | 1220 | |
18213afb AM |
1221 | sdt = paddr + j; |
1222 | avail = min(block_size, dsg->length - offset); | |
1223 | crc = crc_t10dif(daddr + offset, avail); | |
1224 | if (avail < block_size) { | |
1225 | kunmap_atomic(daddr - dsg->offset); | |
1226 | dsg = sg_next(dsg); | |
1227 | if (!dsg) { | |
1228 | kunmap_atomic(paddr - psg->offset); | |
1229 | return; | |
1230 | } | |
1231 | daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; | |
1232 | offset = block_size - avail; | |
1233 | crc = crc_t10dif_update(crc, daddr, offset); | |
1234 | } else { | |
1235 | offset += block_size; | |
66a3d5bc NB |
1236 | } |
1237 | ||
18213afb | 1238 | sdt->guard_tag = cpu_to_be16(crc); |
823ddd87 | 1239 | if (cmd->prot_type == TARGET_DIF_TYPE1_PROT) |
66a3d5bc NB |
1240 | sdt->ref_tag = cpu_to_be32(sector & 0xffffffff); |
1241 | sdt->app_tag = 0; | |
1242 | ||
6ae50408 | 1243 | pr_debug("DIF %s INSERT sector: %llu guard_tag: 0x%04x" |
66a3d5bc | 1244 | " app_tag: 0x%04x ref_tag: %u\n", |
6ae50408 NB |
1245 | (cmd->data_direction == DMA_TO_DEVICE) ? |
1246 | "WRITE" : "READ", (unsigned long long)sector, | |
1247 | sdt->guard_tag, sdt->app_tag, | |
1248 | be32_to_cpu(sdt->ref_tag)); | |
66a3d5bc NB |
1249 | |
1250 | sector++; | |
66a3d5bc NB |
1251 | } |
1252 | ||
18213afb AM |
1253 | kunmap_atomic(daddr - dsg->offset); |
1254 | kunmap_atomic(paddr - psg->offset); | |
66a3d5bc NB |
1255 | } |
1256 | } | |
1257 | ||
41861fa8 | 1258 | static sense_reason_t |
fe052a18 | 1259 | sbc_dif_v1_verify(struct se_cmd *cmd, struct t10_pi_tuple *sdt, |
18213afb | 1260 | __u16 crc, sector_t sector, unsigned int ei_lba) |
41861fa8 | 1261 | { |
41861fa8 NB |
1262 | __be16 csum; |
1263 | ||
d7a463b0 NB |
1264 | if (!(cmd->prot_checks & TARGET_DIF_CHECK_GUARD)) |
1265 | goto check_ref; | |
1266 | ||
18213afb | 1267 | csum = cpu_to_be16(crc); |
41861fa8 NB |
1268 | |
1269 | if (sdt->guard_tag != csum) { | |
1270 | pr_err("DIFv1 checksum failed on sector %llu guard tag 0x%04x" | |
1271 | " csum 0x%04x\n", (unsigned long long)sector, | |
1272 | be16_to_cpu(sdt->guard_tag), be16_to_cpu(csum)); | |
1273 | return TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED; | |
1274 | } | |
1275 | ||
d7a463b0 NB |
1276 | check_ref: |
1277 | if (!(cmd->prot_checks & TARGET_DIF_CHECK_REFTAG)) | |
1278 | return 0; | |
1279 | ||
823ddd87 | 1280 | if (cmd->prot_type == TARGET_DIF_TYPE1_PROT && |
41861fa8 NB |
1281 | be32_to_cpu(sdt->ref_tag) != (sector & 0xffffffff)) { |
1282 | pr_err("DIFv1 Type 1 reference failed on sector: %llu tag: 0x%08x" | |
1283 | " sector MSB: 0x%08x\n", (unsigned long long)sector, | |
1284 | be32_to_cpu(sdt->ref_tag), (u32)(sector & 0xffffffff)); | |
1285 | return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED; | |
1286 | } | |
1287 | ||
823ddd87 | 1288 | if (cmd->prot_type == TARGET_DIF_TYPE2_PROT && |
41861fa8 NB |
1289 | be32_to_cpu(sdt->ref_tag) != ei_lba) { |
1290 | pr_err("DIFv1 Type 2 reference failed on sector: %llu tag: 0x%08x" | |
1291 | " ei_lba: 0x%08x\n", (unsigned long long)sector, | |
1292 | be32_to_cpu(sdt->ref_tag), ei_lba); | |
1293 | return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED; | |
1294 | } | |
1295 | ||
1296 | return 0; | |
1297 | } | |
1298 | ||
f75b6fae SG |
1299 | void sbc_dif_copy_prot(struct se_cmd *cmd, unsigned int sectors, bool read, |
1300 | struct scatterlist *sg, int sg_off) | |
41861fa8 NB |
1301 | { |
1302 | struct se_device *dev = cmd->se_dev; | |
1303 | struct scatterlist *psg; | |
1304 | void *paddr, *addr; | |
1305 | unsigned int i, len, left; | |
10762e80 | 1306 | unsigned int offset = sg_off; |
41861fa8 | 1307 | |
38b57f82 NB |
1308 | if (!sg) |
1309 | return; | |
1310 | ||
41861fa8 NB |
1311 | left = sectors * dev->prot_length; |
1312 | ||
1313 | for_each_sg(cmd->t_prot_sg, psg, cmd->t_prot_nents, i) { | |
16c0ae02 | 1314 | unsigned int psg_len, copied = 0; |
d6a65fdc | 1315 | |
41861fa8 | 1316 | paddr = kmap_atomic(sg_page(psg)) + psg->offset; |
16c0ae02 SG |
1317 | psg_len = min(left, psg->length); |
1318 | while (psg_len) { | |
1319 | len = min(psg_len, sg->length - offset); | |
1320 | addr = kmap_atomic(sg_page(sg)) + sg->offset + offset; | |
1321 | ||
1322 | if (read) | |
1323 | memcpy(paddr + copied, addr, len); | |
1324 | else | |
1325 | memcpy(addr, paddr + copied, len); | |
1326 | ||
1327 | left -= len; | |
1328 | offset += len; | |
1329 | copied += len; | |
1330 | psg_len -= len; | |
1331 | ||
57636388 AM |
1332 | kunmap_atomic(addr - sg->offset - offset); |
1333 | ||
16c0ae02 SG |
1334 | if (offset >= sg->length) { |
1335 | sg = sg_next(sg); | |
1336 | offset = 0; | |
1337 | } | |
16c0ae02 | 1338 | } |
57636388 | 1339 | kunmap_atomic(paddr - psg->offset); |
41861fa8 NB |
1340 | } |
1341 | } | |
f75b6fae | 1342 | EXPORT_SYMBOL(sbc_dif_copy_prot); |
41861fa8 NB |
1343 | |
1344 | sense_reason_t | |
f75b6fae | 1345 | sbc_dif_verify(struct se_cmd *cmd, sector_t start, unsigned int sectors, |
414e4627 | 1346 | unsigned int ei_lba, struct scatterlist *psg, int psg_off) |
41861fa8 NB |
1347 | { |
1348 | struct se_device *dev = cmd->se_dev; | |
fe052a18 | 1349 | struct t10_pi_tuple *sdt; |
18213afb | 1350 | struct scatterlist *dsg = cmd->t_data_sg; |
41861fa8 NB |
1351 | sector_t sector = start; |
1352 | void *daddr, *paddr; | |
18213afb | 1353 | int i; |
41861fa8 | 1354 | sense_reason_t rc; |
18213afb AM |
1355 | int dsg_off = 0; |
1356 | unsigned int block_size = dev->dev_attrib.block_size; | |
41861fa8 | 1357 | |
18213afb | 1358 | for (; psg && sector < start + sectors; psg = sg_next(psg)) { |
41861fa8 | 1359 | paddr = kmap_atomic(sg_page(psg)) + psg->offset; |
41861fa8 | 1360 | daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; |
41861fa8 | 1361 | |
18213afb AM |
1362 | for (i = psg_off; i < psg->length && |
1363 | sector < start + sectors; | |
fe052a18 | 1364 | i += sizeof(*sdt)) { |
18213afb AM |
1365 | __u16 crc; |
1366 | unsigned int avail; | |
41861fa8 | 1367 | |
18213afb AM |
1368 | if (dsg_off >= dsg->length) { |
1369 | dsg_off -= dsg->length; | |
1370 | kunmap_atomic(daddr - dsg->offset); | |
1371 | dsg = sg_next(dsg); | |
1372 | if (!dsg) { | |
1373 | kunmap_atomic(paddr - psg->offset); | |
1374 | return 0; | |
1375 | } | |
1376 | daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; | |
41861fa8 NB |
1377 | } |
1378 | ||
18213afb | 1379 | sdt = paddr + i; |
41861fa8 NB |
1380 | |
1381 | pr_debug("DIF READ sector: %llu guard_tag: 0x%04x" | |
1382 | " app_tag: 0x%04x ref_tag: %u\n", | |
1383 | (unsigned long long)sector, sdt->guard_tag, | |
1384 | sdt->app_tag, be32_to_cpu(sdt->ref_tag)); | |
1385 | ||
1386 | if (sdt->app_tag == cpu_to_be16(0xffff)) { | |
18213afb AM |
1387 | dsg_off += block_size; |
1388 | goto next; | |
1389 | } | |
1390 | ||
1391 | avail = min(block_size, dsg->length - dsg_off); | |
1392 | crc = crc_t10dif(daddr + dsg_off, avail); | |
1393 | if (avail < block_size) { | |
1394 | kunmap_atomic(daddr - dsg->offset); | |
1395 | dsg = sg_next(dsg); | |
1396 | if (!dsg) { | |
1397 | kunmap_atomic(paddr - psg->offset); | |
1398 | return 0; | |
1399 | } | |
1400 | daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; | |
1401 | dsg_off = block_size - avail; | |
1402 | crc = crc_t10dif_update(crc, daddr, dsg_off); | |
1403 | } else { | |
1404 | dsg_off += block_size; | |
41861fa8 NB |
1405 | } |
1406 | ||
18213afb | 1407 | rc = sbc_dif_v1_verify(cmd, sdt, crc, sector, ei_lba); |
41861fa8 | 1408 | if (rc) { |
414e4627 | 1409 | kunmap_atomic(daddr - dsg->offset); |
18213afb | 1410 | kunmap_atomic(paddr - psg->offset); |
76736db3 | 1411 | cmd->bad_sector = sector; |
41861fa8 NB |
1412 | return rc; |
1413 | } | |
18213afb | 1414 | next: |
41861fa8 NB |
1415 | sector++; |
1416 | ei_lba++; | |
41861fa8 NB |
1417 | } |
1418 | ||
18213afb | 1419 | psg_off = 0; |
414e4627 | 1420 | kunmap_atomic(daddr - dsg->offset); |
18213afb | 1421 | kunmap_atomic(paddr - psg->offset); |
41861fa8 | 1422 | } |
41861fa8 NB |
1423 | |
1424 | return 0; | |
1425 | } | |
f75b6fae | 1426 | EXPORT_SYMBOL(sbc_dif_verify); |