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 | |
afd73f1b NB |
39 | static sense_reason_t |
40 | sbc_check_prot(struct se_device *, struct se_cmd *, unsigned char *, u32, bool); | |
41 | ||
de103c93 CH |
42 | static sense_reason_t |
43 | sbc_emulate_readcapacity(struct se_cmd *cmd) | |
1fd032ee CH |
44 | { |
45 | struct se_device *dev = cmd->se_dev; | |
8dc8632a | 46 | unsigned char *cdb = cmd->t_task_cdb; |
1fd032ee | 47 | unsigned long long blocks_long = dev->transport->get_blocks(dev); |
a50da144 PB |
48 | unsigned char *rbuf; |
49 | unsigned char buf[8]; | |
1fd032ee CH |
50 | u32 blocks; |
51 | ||
8dc8632a RD |
52 | /* |
53 | * SBC-2 says: | |
54 | * If the PMI bit is set to zero and the LOGICAL BLOCK | |
55 | * ADDRESS field is not set to zero, the device server shall | |
56 | * terminate the command with CHECK CONDITION status with | |
57 | * the sense key set to ILLEGAL REQUEST and the additional | |
58 | * sense code set to INVALID FIELD IN CDB. | |
59 | * | |
60 | * In SBC-3, these fields are obsolete, but some SCSI | |
61 | * compliance tests actually check this, so we might as well | |
62 | * follow SBC-2. | |
63 | */ | |
64 | if (!(cdb[8] & 1) && !!(cdb[2] | cdb[3] | cdb[4] | cdb[5])) | |
65 | return TCM_INVALID_CDB_FIELD; | |
66 | ||
1fd032ee CH |
67 | if (blocks_long >= 0x00000000ffffffff) |
68 | blocks = 0xffffffff; | |
69 | else | |
70 | blocks = (u32)blocks_long; | |
71 | ||
1fd032ee CH |
72 | buf[0] = (blocks >> 24) & 0xff; |
73 | buf[1] = (blocks >> 16) & 0xff; | |
74 | buf[2] = (blocks >> 8) & 0xff; | |
75 | buf[3] = blocks & 0xff; | |
0fd97ccf CH |
76 | buf[4] = (dev->dev_attrib.block_size >> 24) & 0xff; |
77 | buf[5] = (dev->dev_attrib.block_size >> 16) & 0xff; | |
78 | buf[6] = (dev->dev_attrib.block_size >> 8) & 0xff; | |
79 | buf[7] = dev->dev_attrib.block_size & 0xff; | |
1fd032ee | 80 | |
a50da144 | 81 | rbuf = transport_kmap_data_sg(cmd); |
8b4b0dcb NB |
82 | if (rbuf) { |
83 | memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length)); | |
84 | transport_kunmap_data_sg(cmd); | |
85 | } | |
1fd032ee | 86 | |
2426bd45 | 87 | target_complete_cmd_with_length(cmd, GOOD, 8); |
1fd032ee CH |
88 | return 0; |
89 | } | |
90 | ||
de103c93 CH |
91 | static sense_reason_t |
92 | sbc_emulate_readcapacity_16(struct se_cmd *cmd) | |
1fd032ee CH |
93 | { |
94 | struct se_device *dev = cmd->se_dev; | |
2d335983 | 95 | struct se_session *sess = cmd->se_sess; |
9ef5466e NB |
96 | int pi_prot_type = dev->dev_attrib.pi_prot_type; |
97 | ||
a50da144 PB |
98 | unsigned char *rbuf; |
99 | unsigned char buf[32]; | |
1fd032ee CH |
100 | unsigned long long blocks = dev->transport->get_blocks(dev); |
101 | ||
a50da144 | 102 | memset(buf, 0, sizeof(buf)); |
1fd032ee CH |
103 | buf[0] = (blocks >> 56) & 0xff; |
104 | buf[1] = (blocks >> 48) & 0xff; | |
105 | buf[2] = (blocks >> 40) & 0xff; | |
106 | buf[3] = (blocks >> 32) & 0xff; | |
107 | buf[4] = (blocks >> 24) & 0xff; | |
108 | buf[5] = (blocks >> 16) & 0xff; | |
109 | buf[6] = (blocks >> 8) & 0xff; | |
110 | buf[7] = blocks & 0xff; | |
0fd97ccf CH |
111 | buf[8] = (dev->dev_attrib.block_size >> 24) & 0xff; |
112 | buf[9] = (dev->dev_attrib.block_size >> 16) & 0xff; | |
113 | buf[10] = (dev->dev_attrib.block_size >> 8) & 0xff; | |
114 | buf[11] = dev->dev_attrib.block_size & 0xff; | |
56dac14c NB |
115 | /* |
116 | * Set P_TYPE and PROT_EN bits for DIF support | |
117 | */ | |
2d335983 | 118 | if (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) { |
9ef5466e NB |
119 | /* |
120 | * Only override a device's pi_prot_type if no T10-PI is | |
121 | * available, and sess_prot_type has been explicitly enabled. | |
122 | */ | |
123 | if (!pi_prot_type) | |
124 | pi_prot_type = sess->sess_prot_type; | |
125 | ||
126 | if (pi_prot_type) | |
127 | buf[12] = (pi_prot_type - 1) << 1 | 0x1; | |
2d335983 | 128 | } |
7f7caf6a AG |
129 | |
130 | if (dev->transport->get_lbppbe) | |
131 | buf[13] = dev->transport->get_lbppbe(dev) & 0x0f; | |
132 | ||
133 | if (dev->transport->get_alignment_offset_lbas) { | |
134 | u16 lalba = dev->transport->get_alignment_offset_lbas(dev); | |
135 | buf[14] = (lalba >> 8) & 0x3f; | |
136 | buf[15] = lalba & 0xff; | |
137 | } | |
138 | ||
1fd032ee CH |
139 | /* |
140 | * Set Thin Provisioning Enable bit following sbc3r22 in section | |
141 | * READ CAPACITY (16) byte 14 if emulate_tpu or emulate_tpws is enabled. | |
142 | */ | |
0fd97ccf | 143 | if (dev->dev_attrib.emulate_tpu || dev->dev_attrib.emulate_tpws) |
7f7caf6a | 144 | buf[14] |= 0x80; |
1fd032ee | 145 | |
a50da144 | 146 | rbuf = transport_kmap_data_sg(cmd); |
8b4b0dcb NB |
147 | if (rbuf) { |
148 | memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length)); | |
149 | transport_kunmap_data_sg(cmd); | |
150 | } | |
1fd032ee | 151 | |
2426bd45 | 152 | target_complete_cmd_with_length(cmd, GOOD, 32); |
1fd032ee CH |
153 | return 0; |
154 | } | |
155 | ||
972b29c8 | 156 | sector_t sbc_get_write_same_sectors(struct se_cmd *cmd) |
1fd032ee | 157 | { |
1fd032ee | 158 | u32 num_blocks; |
1fd032ee CH |
159 | |
160 | if (cmd->t_task_cdb[0] == WRITE_SAME) | |
161 | num_blocks = get_unaligned_be16(&cmd->t_task_cdb[7]); | |
162 | else if (cmd->t_task_cdb[0] == WRITE_SAME_16) | |
163 | num_blocks = get_unaligned_be32(&cmd->t_task_cdb[10]); | |
164 | else /* WRITE_SAME_32 via VARIABLE_LENGTH_CMD */ | |
165 | num_blocks = get_unaligned_be32(&cmd->t_task_cdb[28]); | |
166 | ||
167 | /* | |
168 | * Use the explicit range when non zero is supplied, otherwise calculate | |
169 | * the remaining range based on ->get_blocks() - starting LBA. | |
170 | */ | |
6f974e8c CH |
171 | if (num_blocks) |
172 | return num_blocks; | |
1fd032ee | 173 | |
6f974e8c CH |
174 | return cmd->se_dev->transport->get_blocks(cmd->se_dev) - |
175 | cmd->t_task_lba + 1; | |
1fd032ee | 176 | } |
972b29c8 | 177 | EXPORT_SYMBOL(sbc_get_write_same_sectors); |
1fd032ee | 178 | |
de103c93 | 179 | static sense_reason_t |
1920ed61 | 180 | sbc_emulate_noop(struct se_cmd *cmd) |
1a1ff38c BK |
181 | { |
182 | target_complete_cmd(cmd, GOOD); | |
183 | return 0; | |
184 | } | |
185 | ||
d6e0175c CH |
186 | static inline u32 sbc_get_size(struct se_cmd *cmd, u32 sectors) |
187 | { | |
0fd97ccf | 188 | return cmd->se_dev->dev_attrib.block_size * sectors; |
d6e0175c CH |
189 | } |
190 | ||
d6e0175c CH |
191 | static inline u32 transport_get_sectors_6(unsigned char *cdb) |
192 | { | |
193 | /* | |
194 | * Use 8-bit sector value. SBC-3 says: | |
195 | * | |
196 | * A TRANSFER LENGTH field set to zero specifies that 256 | |
197 | * logical blocks shall be written. Any other value | |
198 | * specifies the number of logical blocks that shall be | |
199 | * written. | |
200 | */ | |
201 | return cdb[4] ? : 256; | |
202 | } | |
203 | ||
204 | static inline u32 transport_get_sectors_10(unsigned char *cdb) | |
205 | { | |
206 | return (u32)(cdb[7] << 8) + cdb[8]; | |
207 | } | |
208 | ||
209 | static inline u32 transport_get_sectors_12(unsigned char *cdb) | |
210 | { | |
211 | return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9]; | |
212 | } | |
213 | ||
214 | static inline u32 transport_get_sectors_16(unsigned char *cdb) | |
215 | { | |
216 | return (u32)(cdb[10] << 24) + (cdb[11] << 16) + | |
217 | (cdb[12] << 8) + cdb[13]; | |
218 | } | |
219 | ||
220 | /* | |
221 | * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants | |
222 | */ | |
223 | static inline u32 transport_get_sectors_32(unsigned char *cdb) | |
224 | { | |
225 | return (u32)(cdb[28] << 24) + (cdb[29] << 16) + | |
226 | (cdb[30] << 8) + cdb[31]; | |
227 | ||
228 | } | |
229 | ||
230 | static inline u32 transport_lba_21(unsigned char *cdb) | |
231 | { | |
232 | return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3]; | |
233 | } | |
234 | ||
235 | static inline u32 transport_lba_32(unsigned char *cdb) | |
236 | { | |
237 | return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5]; | |
238 | } | |
239 | ||
240 | static inline unsigned long long transport_lba_64(unsigned char *cdb) | |
241 | { | |
242 | unsigned int __v1, __v2; | |
243 | ||
244 | __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5]; | |
245 | __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9]; | |
246 | ||
247 | return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; | |
248 | } | |
249 | ||
250 | /* | |
251 | * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs | |
252 | */ | |
253 | static inline unsigned long long transport_lba_64_ext(unsigned char *cdb) | |
254 | { | |
255 | unsigned int __v1, __v2; | |
256 | ||
257 | __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15]; | |
258 | __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19]; | |
259 | ||
260 | return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; | |
261 | } | |
262 | ||
cd063bef NB |
263 | static sense_reason_t |
264 | sbc_setup_write_same(struct se_cmd *cmd, unsigned char *flags, struct sbc_ops *ops) | |
d6e0175c | 265 | { |
8e575c50 NB |
266 | struct se_device *dev = cmd->se_dev; |
267 | sector_t end_lba = dev->transport->get_blocks(dev) + 1; | |
972b29c8 | 268 | unsigned int sectors = sbc_get_write_same_sectors(cmd); |
afd73f1b | 269 | sense_reason_t ret; |
773cbaf7 | 270 | |
d6e0175c CH |
271 | if ((flags[0] & 0x04) || (flags[0] & 0x02)) { |
272 | pr_err("WRITE_SAME PBDATA and LBDATA" | |
273 | " bits not supported for Block Discard" | |
274 | " Emulation\n"); | |
cd063bef | 275 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
d6e0175c | 276 | } |
773cbaf7 NB |
277 | if (sectors > cmd->se_dev->dev_attrib.max_write_same_len) { |
278 | pr_warn("WRITE_SAME sectors: %u exceeds max_write_same_len: %u\n", | |
279 | sectors, cmd->se_dev->dev_attrib.max_write_same_len); | |
280 | return TCM_INVALID_CDB_FIELD; | |
281 | } | |
8e575c50 NB |
282 | /* |
283 | * Sanity check for LBA wrap and request past end of device. | |
284 | */ | |
285 | if (((cmd->t_task_lba + sectors) < cmd->t_task_lba) || | |
286 | ((cmd->t_task_lba + sectors) > end_lba)) { | |
287 | pr_err("WRITE_SAME exceeds last lba %llu (lba %llu, sectors %u)\n", | |
288 | (unsigned long long)end_lba, cmd->t_task_lba, sectors); | |
289 | return TCM_ADDRESS_OUT_OF_RANGE; | |
290 | } | |
291 | ||
5cb770bf RD |
292 | /* We always have ANC_SUP == 0 so setting ANCHOR is always an error */ |
293 | if (flags[0] & 0x10) { | |
294 | pr_warn("WRITE SAME with ANCHOR not supported\n"); | |
295 | return TCM_INVALID_CDB_FIELD; | |
296 | } | |
d6e0175c | 297 | /* |
cd063bef NB |
298 | * Special case for WRITE_SAME w/ UNMAP=1 that ends up getting |
299 | * translated into block discard requests within backend code. | |
d6e0175c | 300 | */ |
cd063bef NB |
301 | if (flags[0] & 0x08) { |
302 | if (!ops->execute_write_same_unmap) | |
303 | return TCM_UNSUPPORTED_SCSI_OPCODE; | |
304 | ||
d0a91295 NB |
305 | if (!dev->dev_attrib.emulate_tpws) { |
306 | pr_err("Got WRITE_SAME w/ UNMAP=1, but backend device" | |
307 | " has emulate_tpws disabled\n"); | |
308 | return TCM_UNSUPPORTED_SCSI_OPCODE; | |
309 | } | |
cd063bef NB |
310 | cmd->execute_cmd = ops->execute_write_same_unmap; |
311 | return 0; | |
d6e0175c | 312 | } |
cd063bef NB |
313 | if (!ops->execute_write_same) |
314 | return TCM_UNSUPPORTED_SCSI_OPCODE; | |
d6e0175c | 315 | |
afd73f1b NB |
316 | ret = sbc_check_prot(dev, cmd, &cmd->t_task_cdb[0], sectors, true); |
317 | if (ret) | |
318 | return ret; | |
319 | ||
cd063bef | 320 | cmd->execute_cmd = ops->execute_write_same; |
d6e0175c CH |
321 | return 0; |
322 | } | |
323 | ||
c8e63985 | 324 | static sense_reason_t xdreadwrite_callback(struct se_cmd *cmd, bool success) |
d6e0175c CH |
325 | { |
326 | unsigned char *buf, *addr; | |
327 | struct scatterlist *sg; | |
328 | unsigned int offset; | |
a6b0133c NB |
329 | sense_reason_t ret = TCM_NO_SENSE; |
330 | int i, count; | |
d6e0175c CH |
331 | /* |
332 | * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command | |
333 | * | |
334 | * 1) read the specified logical block(s); | |
335 | * 2) transfer logical blocks from the data-out buffer; | |
336 | * 3) XOR the logical blocks transferred from the data-out buffer with | |
337 | * the logical blocks read, storing the resulting XOR data in a buffer; | |
338 | * 4) if the DISABLE WRITE bit is set to zero, then write the logical | |
339 | * blocks transferred from the data-out buffer; and | |
340 | * 5) transfer the resulting XOR data to the data-in buffer. | |
341 | */ | |
342 | buf = kmalloc(cmd->data_length, GFP_KERNEL); | |
343 | if (!buf) { | |
344 | pr_err("Unable to allocate xor_callback buf\n"); | |
a6b0133c | 345 | return TCM_OUT_OF_RESOURCES; |
d6e0175c CH |
346 | } |
347 | /* | |
348 | * Copy the scatterlist WRITE buffer located at cmd->t_data_sg | |
349 | * into the locally allocated *buf | |
350 | */ | |
351 | sg_copy_to_buffer(cmd->t_data_sg, | |
352 | cmd->t_data_nents, | |
353 | buf, | |
354 | cmd->data_length); | |
355 | ||
356 | /* | |
357 | * Now perform the XOR against the BIDI read memory located at | |
358 | * cmd->t_mem_bidi_list | |
359 | */ | |
360 | ||
361 | offset = 0; | |
362 | for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) { | |
363 | addr = kmap_atomic(sg_page(sg)); | |
a6b0133c NB |
364 | if (!addr) { |
365 | ret = TCM_OUT_OF_RESOURCES; | |
d6e0175c | 366 | goto out; |
a6b0133c | 367 | } |
d6e0175c CH |
368 | |
369 | for (i = 0; i < sg->length; i++) | |
370 | *(addr + sg->offset + i) ^= *(buf + offset + i); | |
371 | ||
372 | offset += sg->length; | |
373 | kunmap_atomic(addr); | |
374 | } | |
375 | ||
376 | out: | |
377 | kfree(buf); | |
a6b0133c | 378 | return ret; |
d6e0175c CH |
379 | } |
380 | ||
a82a9538 NB |
381 | static sense_reason_t |
382 | sbc_execute_rw(struct se_cmd *cmd) | |
383 | { | |
384 | return cmd->execute_rw(cmd, cmd->t_data_sg, cmd->t_data_nents, | |
385 | cmd->data_direction); | |
386 | } | |
387 | ||
c8e63985 | 388 | static sense_reason_t compare_and_write_post(struct se_cmd *cmd, bool success) |
68ff9b9b NB |
389 | { |
390 | struct se_device *dev = cmd->se_dev; | |
391 | ||
d8855c15 NB |
392 | /* |
393 | * Only set SCF_COMPARE_AND_WRITE_POST to force a response fall-through | |
394 | * within target_complete_ok_work() if the command was successfully | |
395 | * sent to the backend driver. | |
396 | */ | |
397 | spin_lock_irq(&cmd->t_state_lock); | |
398 | if ((cmd->transport_state & CMD_T_SENT) && !cmd->scsi_status) | |
399 | cmd->se_cmd_flags |= SCF_COMPARE_AND_WRITE_POST; | |
400 | spin_unlock_irq(&cmd->t_state_lock); | |
401 | ||
68ff9b9b NB |
402 | /* |
403 | * Unlock ->caw_sem originally obtained during sbc_compare_and_write() | |
404 | * before the original READ I/O submission. | |
405 | */ | |
406 | up(&dev->caw_sem); | |
407 | ||
408 | return TCM_NO_SENSE; | |
409 | } | |
410 | ||
c8e63985 | 411 | static sense_reason_t compare_and_write_callback(struct se_cmd *cmd, bool success) |
68ff9b9b NB |
412 | { |
413 | struct se_device *dev = cmd->se_dev; | |
414 | struct scatterlist *write_sg = NULL, *sg; | |
db60df88 | 415 | unsigned char *buf = NULL, *addr; |
68ff9b9b NB |
416 | struct sg_mapping_iter m; |
417 | unsigned int offset = 0, len; | |
418 | unsigned int nlbas = cmd->t_task_nolb; | |
419 | unsigned int block_size = dev->dev_attrib.block_size; | |
420 | unsigned int compare_len = (nlbas * block_size); | |
421 | sense_reason_t ret = TCM_NO_SENSE; | |
422 | int rc, i; | |
423 | ||
cf6d1f09 NB |
424 | /* |
425 | * Handle early failure in transport_generic_request_failure(), | |
c8e63985 | 426 | * which will not have taken ->caw_sem yet.. |
cf6d1f09 | 427 | */ |
c8e63985 | 428 | if (!success && (!cmd->t_data_sg || !cmd->t_bidi_data_sg)) |
cf6d1f09 | 429 | return TCM_NO_SENSE; |
c8e63985 NB |
430 | /* |
431 | * Handle special case for zero-length COMPARE_AND_WRITE | |
432 | */ | |
433 | if (!cmd->data_length) | |
434 | goto out; | |
db60df88 NB |
435 | /* |
436 | * Immediately exit + release dev->caw_sem if command has already | |
437 | * been failed with a non-zero SCSI status. | |
438 | */ | |
439 | if (cmd->scsi_status) { | |
440 | pr_err("compare_and_write_callback: non zero scsi_status:" | |
441 | " 0x%02x\n", cmd->scsi_status); | |
442 | goto out; | |
443 | } | |
cf6d1f09 | 444 | |
68ff9b9b NB |
445 | buf = kzalloc(cmd->data_length, GFP_KERNEL); |
446 | if (!buf) { | |
447 | pr_err("Unable to allocate compare_and_write buf\n"); | |
a2890087 NB |
448 | ret = TCM_OUT_OF_RESOURCES; |
449 | goto out; | |
68ff9b9b NB |
450 | } |
451 | ||
a1e1774c | 452 | write_sg = kmalloc(sizeof(struct scatterlist) * cmd->t_data_nents, |
68ff9b9b NB |
453 | GFP_KERNEL); |
454 | if (!write_sg) { | |
455 | pr_err("Unable to allocate compare_and_write sg\n"); | |
456 | ret = TCM_OUT_OF_RESOURCES; | |
457 | goto out; | |
458 | } | |
a1e1774c | 459 | sg_init_table(write_sg, cmd->t_data_nents); |
68ff9b9b NB |
460 | /* |
461 | * Setup verify and write data payloads from total NumberLBAs. | |
462 | */ | |
463 | rc = sg_copy_to_buffer(cmd->t_data_sg, cmd->t_data_nents, buf, | |
464 | cmd->data_length); | |
465 | if (!rc) { | |
466 | pr_err("sg_copy_to_buffer() failed for compare_and_write\n"); | |
467 | ret = TCM_OUT_OF_RESOURCES; | |
468 | goto out; | |
469 | } | |
470 | /* | |
471 | * Compare against SCSI READ payload against verify payload | |
472 | */ | |
473 | for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, i) { | |
474 | addr = (unsigned char *)kmap_atomic(sg_page(sg)); | |
475 | if (!addr) { | |
476 | ret = TCM_OUT_OF_RESOURCES; | |
477 | goto out; | |
478 | } | |
479 | ||
480 | len = min(sg->length, compare_len); | |
481 | ||
482 | if (memcmp(addr, buf + offset, len)) { | |
483 | pr_warn("Detected MISCOMPARE for addr: %p buf: %p\n", | |
484 | addr, buf + offset); | |
485 | kunmap_atomic(addr); | |
486 | goto miscompare; | |
487 | } | |
488 | kunmap_atomic(addr); | |
489 | ||
490 | offset += len; | |
491 | compare_len -= len; | |
492 | if (!compare_len) | |
493 | break; | |
494 | } | |
495 | ||
496 | i = 0; | |
497 | len = cmd->t_task_nolb * block_size; | |
498 | sg_miter_start(&m, cmd->t_data_sg, cmd->t_data_nents, SG_MITER_TO_SG); | |
499 | /* | |
500 | * Currently assumes NoLB=1 and SGLs are PAGE_SIZE.. | |
501 | */ | |
502 | while (len) { | |
503 | sg_miter_next(&m); | |
504 | ||
505 | if (block_size < PAGE_SIZE) { | |
506 | sg_set_page(&write_sg[i], m.page, block_size, | |
507 | block_size); | |
508 | } else { | |
509 | sg_miter_next(&m); | |
510 | sg_set_page(&write_sg[i], m.page, block_size, | |
511 | 0); | |
512 | } | |
513 | len -= block_size; | |
514 | i++; | |
515 | } | |
516 | sg_miter_stop(&m); | |
517 | /* | |
518 | * Save the original SGL + nents values before updating to new | |
519 | * assignments, to be released in transport_free_pages() -> | |
520 | * transport_reset_sgl_orig() | |
521 | */ | |
522 | cmd->t_data_sg_orig = cmd->t_data_sg; | |
523 | cmd->t_data_sg = write_sg; | |
524 | cmd->t_data_nents_orig = cmd->t_data_nents; | |
525 | cmd->t_data_nents = 1; | |
526 | ||
68d81f40 | 527 | cmd->sam_task_attr = TCM_HEAD_TAG; |
68ff9b9b NB |
528 | cmd->transport_complete_callback = compare_and_write_post; |
529 | /* | |
530 | * Now reset ->execute_cmd() to the normal sbc_execute_rw() handler | |
531 | * for submitting the adjusted SGL to write instance user-data. | |
532 | */ | |
533 | cmd->execute_cmd = sbc_execute_rw; | |
534 | ||
535 | spin_lock_irq(&cmd->t_state_lock); | |
536 | cmd->t_state = TRANSPORT_PROCESSING; | |
537 | cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT; | |
538 | spin_unlock_irq(&cmd->t_state_lock); | |
539 | ||
540 | __target_execute_cmd(cmd); | |
541 | ||
542 | kfree(buf); | |
543 | return ret; | |
544 | ||
545 | miscompare: | |
546 | pr_warn("Target/%s: Send MISCOMPARE check condition and sense\n", | |
547 | dev->transport->name); | |
548 | ret = TCM_MISCOMPARE_VERIFY; | |
549 | out: | |
550 | /* | |
551 | * In the MISCOMPARE or failure case, unlock ->caw_sem obtained in | |
552 | * sbc_compare_and_write() before the original READ I/O submission. | |
553 | */ | |
554 | up(&dev->caw_sem); | |
555 | kfree(write_sg); | |
556 | kfree(buf); | |
557 | return ret; | |
558 | } | |
559 | ||
560 | static sense_reason_t | |
561 | sbc_compare_and_write(struct se_cmd *cmd) | |
562 | { | |
563 | struct se_device *dev = cmd->se_dev; | |
564 | sense_reason_t ret; | |
565 | int rc; | |
566 | /* | |
567 | * Submit the READ first for COMPARE_AND_WRITE to perform the | |
568 | * comparision using SGLs at cmd->t_bidi_data_sg.. | |
569 | */ | |
570 | rc = down_interruptible(&dev->caw_sem); | |
571 | if ((rc != 0) || signal_pending(current)) { | |
572 | cmd->transport_complete_callback = NULL; | |
573 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
574 | } | |
b7191253 NB |
575 | /* |
576 | * Reset cmd->data_length to individual block_size in order to not | |
577 | * confuse backend drivers that depend on this value matching the | |
578 | * size of the I/O being submitted. | |
579 | */ | |
580 | cmd->data_length = cmd->t_task_nolb * dev->dev_attrib.block_size; | |
68ff9b9b NB |
581 | |
582 | ret = cmd->execute_rw(cmd, cmd->t_bidi_data_sg, cmd->t_bidi_data_nents, | |
583 | DMA_FROM_DEVICE); | |
584 | if (ret) { | |
585 | cmd->transport_complete_callback = NULL; | |
586 | up(&dev->caw_sem); | |
587 | return ret; | |
588 | } | |
589 | /* | |
590 | * Unlock of dev->caw_sem to occur in compare_and_write_callback() | |
591 | * upon MISCOMPARE, or in compare_and_write_done() upon completion | |
592 | * of WRITE instance user-data. | |
593 | */ | |
594 | return TCM_NO_SENSE; | |
595 | } | |
596 | ||
19f9361a | 597 | static int |
38b57f82 | 598 | sbc_set_prot_op_checks(u8 protect, bool fabric_prot, enum target_prot_type prot_type, |
19f9361a SG |
599 | bool is_write, struct se_cmd *cmd) |
600 | { | |
601 | if (is_write) { | |
38b57f82 NB |
602 | cmd->prot_op = fabric_prot ? TARGET_PROT_DOUT_STRIP : |
603 | protect ? TARGET_PROT_DOUT_PASS : | |
604 | TARGET_PROT_DOUT_INSERT; | |
19f9361a SG |
605 | switch (protect) { |
606 | case 0x0: | |
607 | case 0x3: | |
608 | cmd->prot_checks = 0; | |
609 | break; | |
610 | case 0x1: | |
611 | case 0x5: | |
612 | cmd->prot_checks = TARGET_DIF_CHECK_GUARD; | |
613 | if (prot_type == TARGET_DIF_TYPE1_PROT) | |
614 | cmd->prot_checks |= TARGET_DIF_CHECK_REFTAG; | |
615 | break; | |
616 | case 0x2: | |
617 | if (prot_type == TARGET_DIF_TYPE1_PROT) | |
618 | cmd->prot_checks = TARGET_DIF_CHECK_REFTAG; | |
619 | break; | |
620 | case 0x4: | |
621 | cmd->prot_checks = TARGET_DIF_CHECK_GUARD; | |
622 | break; | |
623 | default: | |
624 | pr_err("Unsupported protect field %d\n", protect); | |
625 | return -EINVAL; | |
626 | } | |
627 | } else { | |
38b57f82 NB |
628 | cmd->prot_op = fabric_prot ? TARGET_PROT_DIN_INSERT : |
629 | protect ? TARGET_PROT_DIN_PASS : | |
630 | TARGET_PROT_DIN_STRIP; | |
19f9361a SG |
631 | switch (protect) { |
632 | case 0x0: | |
633 | case 0x1: | |
634 | case 0x5: | |
635 | cmd->prot_checks = TARGET_DIF_CHECK_GUARD; | |
636 | if (prot_type == TARGET_DIF_TYPE1_PROT) | |
637 | cmd->prot_checks |= TARGET_DIF_CHECK_REFTAG; | |
638 | break; | |
639 | case 0x2: | |
640 | if (prot_type == TARGET_DIF_TYPE1_PROT) | |
641 | cmd->prot_checks = TARGET_DIF_CHECK_REFTAG; | |
642 | break; | |
643 | case 0x3: | |
644 | cmd->prot_checks = 0; | |
645 | break; | |
646 | case 0x4: | |
647 | cmd->prot_checks = TARGET_DIF_CHECK_GUARD; | |
648 | break; | |
649 | default: | |
650 | pr_err("Unsupported protect field %d\n", protect); | |
651 | return -EINVAL; | |
652 | } | |
653 | } | |
654 | ||
655 | return 0; | |
656 | } | |
657 | ||
f7b7c06f | 658 | static sense_reason_t |
499bf77b | 659 | sbc_check_prot(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb, |
19f9361a | 660 | u32 sectors, bool is_write) |
499bf77b | 661 | { |
19f9361a | 662 | u8 protect = cdb[1] >> 5; |
38b57f82 NB |
663 | int sp_ops = cmd->se_sess->sup_prot_ops; |
664 | int pi_prot_type = dev->dev_attrib.pi_prot_type; | |
665 | bool fabric_prot = false; | |
19f9361a | 666 | |
f7b7c06f | 667 | if (!cmd->t_prot_sg || !cmd->t_prot_nents) { |
38b57f82 NB |
668 | if (unlikely(protect && |
669 | !dev->dev_attrib.pi_prot_type && !cmd->se_sess->sess_prot_type)) { | |
670 | pr_err("CDB contains protect bit, but device + fabric does" | |
671 | " not advertise PROTECT=1 feature bit\n"); | |
f7b7c06f NB |
672 | return TCM_INVALID_CDB_FIELD; |
673 | } | |
674 | if (cmd->prot_pto) | |
675 | return TCM_NO_SENSE; | |
676 | } | |
499bf77b NB |
677 | |
678 | switch (dev->dev_attrib.pi_prot_type) { | |
679 | case TARGET_DIF_TYPE3_PROT: | |
499bf77b NB |
680 | cmd->reftag_seed = 0xffffffff; |
681 | break; | |
682 | case TARGET_DIF_TYPE2_PROT: | |
19f9361a | 683 | if (protect) |
f7b7c06f | 684 | return TCM_INVALID_CDB_FIELD; |
499bf77b NB |
685 | |
686 | cmd->reftag_seed = cmd->t_task_lba; | |
687 | break; | |
688 | case TARGET_DIF_TYPE1_PROT: | |
499bf77b NB |
689 | cmd->reftag_seed = cmd->t_task_lba; |
690 | break; | |
691 | case TARGET_DIF_TYPE0_PROT: | |
38b57f82 NB |
692 | /* |
693 | * See if the fabric supports T10-PI, and the session has been | |
694 | * configured to allow export PROTECT=1 feature bit with backend | |
695 | * devices that don't support T10-PI. | |
696 | */ | |
697 | fabric_prot = is_write ? | |
698 | !!(sp_ops & (TARGET_PROT_DOUT_PASS | TARGET_PROT_DOUT_STRIP)) : | |
699 | !!(sp_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DIN_INSERT)); | |
700 | ||
701 | if (fabric_prot && cmd->se_sess->sess_prot_type) { | |
702 | pi_prot_type = cmd->se_sess->sess_prot_type; | |
703 | break; | |
704 | } | |
cceca4a6 NB |
705 | if (!protect) |
706 | return TCM_NO_SENSE; | |
38b57f82 | 707 | /* Fallthrough */ |
499bf77b | 708 | default: |
cceca4a6 NB |
709 | pr_err("Unable to determine pi_prot_type for CDB: 0x%02x " |
710 | "PROTECT: 0x%02x\n", cdb[0], protect); | |
711 | return TCM_INVALID_CDB_FIELD; | |
499bf77b NB |
712 | } |
713 | ||
38b57f82 | 714 | if (sbc_set_prot_op_checks(protect, fabric_prot, pi_prot_type, is_write, cmd)) |
f7b7c06f | 715 | return TCM_INVALID_CDB_FIELD; |
19f9361a | 716 | |
38b57f82 | 717 | cmd->prot_type = pi_prot_type; |
499bf77b | 718 | cmd->prot_length = dev->prot_length * sectors; |
e2a4f55c SG |
719 | |
720 | /** | |
721 | * In case protection information exists over the wire | |
722 | * we modify command data length to describe pure data. | |
723 | * The actual transfer length is data length + protection | |
724 | * length | |
725 | **/ | |
726 | if (protect) | |
727 | cmd->data_length = sectors * dev->dev_attrib.block_size; | |
728 | ||
729 | pr_debug("%s: prot_type=%d, data_length=%d, prot_length=%d " | |
730 | "prot_op=%d prot_checks=%d\n", | |
731 | __func__, cmd->prot_type, cmd->data_length, cmd->prot_length, | |
03abad9e | 732 | cmd->prot_op, cmd->prot_checks); |
499bf77b | 733 | |
f7b7c06f | 734 | return TCM_NO_SENSE; |
499bf77b NB |
735 | } |
736 | ||
fde9f50f NB |
737 | static int |
738 | sbc_check_dpofua(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb) | |
739 | { | |
740 | if (cdb[1] & 0x10) { | |
741 | if (!dev->dev_attrib.emulate_dpo) { | |
742 | pr_err("Got CDB: 0x%02x with DPO bit set, but device" | |
743 | " does not advertise support for DPO\n", cdb[0]); | |
744 | return -EINVAL; | |
745 | } | |
746 | } | |
747 | if (cdb[1] & 0x8) { | |
9bc6548f | 748 | if (!dev->dev_attrib.emulate_fua_write || !se_dev_check_wce(dev)) { |
fde9f50f NB |
749 | pr_err("Got CDB: 0x%02x with FUA bit set, but device" |
750 | " does not advertise support for FUA write\n", | |
751 | cdb[0]); | |
752 | return -EINVAL; | |
753 | } | |
754 | cmd->se_cmd_flags |= SCF_FUA; | |
755 | } | |
756 | return 0; | |
499bf77b NB |
757 | } |
758 | ||
de103c93 CH |
759 | sense_reason_t |
760 | sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops) | |
d6e0175c | 761 | { |
d6e0175c CH |
762 | struct se_device *dev = cmd->se_dev; |
763 | unsigned char *cdb = cmd->t_task_cdb; | |
1fd032ee | 764 | unsigned int size; |
d6e0175c | 765 | u32 sectors = 0; |
de103c93 | 766 | sense_reason_t ret; |
d6e0175c CH |
767 | |
768 | switch (cdb[0]) { | |
769 | case READ_6: | |
770 | sectors = transport_get_sectors_6(cdb); | |
771 | cmd->t_task_lba = transport_lba_21(cdb); | |
772 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
a82a9538 NB |
773 | cmd->execute_rw = ops->execute_rw; |
774 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c CH |
775 | break; |
776 | case READ_10: | |
777 | sectors = transport_get_sectors_10(cdb); | |
778 | cmd->t_task_lba = transport_lba_32(cdb); | |
499bf77b | 779 | |
fde9f50f NB |
780 | if (sbc_check_dpofua(dev, cmd, cdb)) |
781 | return TCM_INVALID_CDB_FIELD; | |
782 | ||
f7b7c06f NB |
783 | ret = sbc_check_prot(dev, cmd, cdb, sectors, false); |
784 | if (ret) | |
785 | return ret; | |
499bf77b | 786 | |
d6e0175c | 787 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
a82a9538 NB |
788 | cmd->execute_rw = ops->execute_rw; |
789 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c CH |
790 | break; |
791 | case READ_12: | |
792 | sectors = transport_get_sectors_12(cdb); | |
793 | cmd->t_task_lba = transport_lba_32(cdb); | |
499bf77b | 794 | |
fde9f50f NB |
795 | if (sbc_check_dpofua(dev, cmd, cdb)) |
796 | return TCM_INVALID_CDB_FIELD; | |
797 | ||
f7b7c06f NB |
798 | ret = sbc_check_prot(dev, cmd, cdb, sectors, false); |
799 | if (ret) | |
800 | return ret; | |
499bf77b | 801 | |
d6e0175c | 802 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
a82a9538 NB |
803 | cmd->execute_rw = ops->execute_rw; |
804 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c CH |
805 | break; |
806 | case READ_16: | |
807 | sectors = transport_get_sectors_16(cdb); | |
808 | cmd->t_task_lba = transport_lba_64(cdb); | |
499bf77b | 809 | |
fde9f50f NB |
810 | if (sbc_check_dpofua(dev, cmd, cdb)) |
811 | return TCM_INVALID_CDB_FIELD; | |
812 | ||
f7b7c06f NB |
813 | ret = sbc_check_prot(dev, cmd, cdb, sectors, false); |
814 | if (ret) | |
815 | return ret; | |
499bf77b | 816 | |
d6e0175c | 817 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
a82a9538 NB |
818 | cmd->execute_rw = ops->execute_rw; |
819 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c CH |
820 | break; |
821 | case WRITE_6: | |
822 | sectors = transport_get_sectors_6(cdb); | |
823 | cmd->t_task_lba = transport_lba_21(cdb); | |
824 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
a82a9538 NB |
825 | cmd->execute_rw = ops->execute_rw; |
826 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c CH |
827 | break; |
828 | case WRITE_10: | |
829 | case WRITE_VERIFY: | |
830 | sectors = transport_get_sectors_10(cdb); | |
831 | cmd->t_task_lba = transport_lba_32(cdb); | |
499bf77b | 832 | |
fde9f50f NB |
833 | if (sbc_check_dpofua(dev, cmd, cdb)) |
834 | return TCM_INVALID_CDB_FIELD; | |
835 | ||
f7b7c06f NB |
836 | ret = sbc_check_prot(dev, cmd, cdb, sectors, true); |
837 | if (ret) | |
838 | return ret; | |
499bf77b | 839 | |
d6e0175c | 840 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
a82a9538 NB |
841 | cmd->execute_rw = ops->execute_rw; |
842 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c CH |
843 | break; |
844 | case WRITE_12: | |
845 | sectors = transport_get_sectors_12(cdb); | |
846 | cmd->t_task_lba = transport_lba_32(cdb); | |
499bf77b | 847 | |
fde9f50f NB |
848 | if (sbc_check_dpofua(dev, cmd, cdb)) |
849 | return TCM_INVALID_CDB_FIELD; | |
850 | ||
f7b7c06f NB |
851 | ret = sbc_check_prot(dev, cmd, cdb, sectors, true); |
852 | if (ret) | |
853 | return ret; | |
499bf77b | 854 | |
d6e0175c | 855 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
a82a9538 NB |
856 | cmd->execute_rw = ops->execute_rw; |
857 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c CH |
858 | break; |
859 | case WRITE_16: | |
860 | sectors = transport_get_sectors_16(cdb); | |
861 | cmd->t_task_lba = transport_lba_64(cdb); | |
499bf77b | 862 | |
fde9f50f NB |
863 | if (sbc_check_dpofua(dev, cmd, cdb)) |
864 | return TCM_INVALID_CDB_FIELD; | |
865 | ||
f7b7c06f NB |
866 | ret = sbc_check_prot(dev, cmd, cdb, sectors, true); |
867 | if (ret) | |
868 | return ret; | |
499bf77b | 869 | |
d6e0175c | 870 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
a82a9538 NB |
871 | cmd->execute_rw = ops->execute_rw; |
872 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c CH |
873 | break; |
874 | case XDWRITEREAD_10: | |
de103c93 | 875 | if (cmd->data_direction != DMA_TO_DEVICE || |
d6e0175c | 876 | !(cmd->se_cmd_flags & SCF_BIDI)) |
de103c93 | 877 | return TCM_INVALID_CDB_FIELD; |
d6e0175c CH |
878 | sectors = transport_get_sectors_10(cdb); |
879 | ||
fde9f50f NB |
880 | if (sbc_check_dpofua(dev, cmd, cdb)) |
881 | return TCM_INVALID_CDB_FIELD; | |
882 | ||
d6e0175c CH |
883 | cmd->t_task_lba = transport_lba_32(cdb); |
884 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
885 | ||
886 | /* | |
887 | * Setup BIDI XOR callback to be run after I/O completion. | |
888 | */ | |
a82a9538 NB |
889 | cmd->execute_rw = ops->execute_rw; |
890 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c | 891 | cmd->transport_complete_callback = &xdreadwrite_callback; |
d6e0175c CH |
892 | break; |
893 | case VARIABLE_LENGTH_CMD: | |
894 | { | |
895 | u16 service_action = get_unaligned_be16(&cdb[8]); | |
896 | switch (service_action) { | |
897 | case XDWRITEREAD_32: | |
898 | sectors = transport_get_sectors_32(cdb); | |
899 | ||
fde9f50f NB |
900 | if (sbc_check_dpofua(dev, cmd, cdb)) |
901 | return TCM_INVALID_CDB_FIELD; | |
d6e0175c CH |
902 | /* |
903 | * Use WRITE_32 and READ_32 opcodes for the emulated | |
904 | * XDWRITE_READ_32 logic. | |
905 | */ | |
906 | cmd->t_task_lba = transport_lba_64_ext(cdb); | |
907 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
908 | ||
909 | /* | |
910 | * Setup BIDI XOR callback to be run during after I/O | |
911 | * completion. | |
912 | */ | |
a82a9538 NB |
913 | cmd->execute_rw = ops->execute_rw; |
914 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c | 915 | cmd->transport_complete_callback = &xdreadwrite_callback; |
d6e0175c CH |
916 | break; |
917 | case WRITE_SAME_32: | |
918 | sectors = transport_get_sectors_32(cdb); | |
919 | if (!sectors) { | |
920 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not" | |
921 | " supported\n"); | |
de103c93 | 922 | return TCM_INVALID_CDB_FIELD; |
d6e0175c CH |
923 | } |
924 | ||
1fd032ee | 925 | size = sbc_get_size(cmd, 1); |
d6e0175c CH |
926 | cmd->t_task_lba = get_unaligned_be64(&cdb[12]); |
927 | ||
cd063bef | 928 | ret = sbc_setup_write_same(cmd, &cdb[10], ops); |
6b64e1fe | 929 | if (ret) |
cd063bef | 930 | return ret; |
d6e0175c CH |
931 | break; |
932 | default: | |
933 | pr_err("VARIABLE_LENGTH_CMD service action" | |
934 | " 0x%04x not supported\n", service_action); | |
de103c93 | 935 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
d6e0175c CH |
936 | } |
937 | break; | |
938 | } | |
68ff9b9b NB |
939 | case COMPARE_AND_WRITE: |
940 | sectors = cdb[13]; | |
941 | /* | |
942 | * Currently enforce COMPARE_AND_WRITE for a single sector | |
943 | */ | |
944 | if (sectors > 1) { | |
945 | pr_err("COMPARE_AND_WRITE contains NoLB: %u greater" | |
946 | " than 1\n", sectors); | |
947 | return TCM_INVALID_CDB_FIELD; | |
948 | } | |
949 | /* | |
950 | * Double size because we have two buffers, note that | |
951 | * zero is not an error.. | |
952 | */ | |
953 | size = 2 * sbc_get_size(cmd, sectors); | |
954 | cmd->t_task_lba = get_unaligned_be64(&cdb[2]); | |
955 | cmd->t_task_nolb = sectors; | |
956 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB | SCF_COMPARE_AND_WRITE; | |
957 | cmd->execute_rw = ops->execute_rw; | |
958 | cmd->execute_cmd = sbc_compare_and_write; | |
959 | cmd->transport_complete_callback = compare_and_write_callback; | |
960 | break; | |
d6e0175c | 961 | case READ_CAPACITY: |
1fd032ee CH |
962 | size = READ_CAP_LEN; |
963 | cmd->execute_cmd = sbc_emulate_readcapacity; | |
d6e0175c | 964 | break; |
eb846d9f | 965 | case SERVICE_ACTION_IN_16: |
d6e0175c CH |
966 | switch (cmd->t_task_cdb[1] & 0x1f) { |
967 | case SAI_READ_CAPACITY_16: | |
1fd032ee | 968 | cmd->execute_cmd = sbc_emulate_readcapacity_16; |
d6e0175c | 969 | break; |
c66094bf HR |
970 | case SAI_REPORT_REFERRALS: |
971 | cmd->execute_cmd = target_emulate_report_referrals; | |
972 | break; | |
d6e0175c CH |
973 | default: |
974 | pr_err("Unsupported SA: 0x%02x\n", | |
975 | cmd->t_task_cdb[1] & 0x1f); | |
de103c93 | 976 | return TCM_INVALID_CDB_FIELD; |
d6e0175c | 977 | } |
1fd032ee | 978 | size = (cdb[10] << 24) | (cdb[11] << 16) | |
d6e0175c CH |
979 | (cdb[12] << 8) | cdb[13]; |
980 | break; | |
981 | case SYNCHRONIZE_CACHE: | |
982 | case SYNCHRONIZE_CACHE_16: | |
d6e0175c CH |
983 | if (cdb[0] == SYNCHRONIZE_CACHE) { |
984 | sectors = transport_get_sectors_10(cdb); | |
985 | cmd->t_task_lba = transport_lba_32(cdb); | |
986 | } else { | |
987 | sectors = transport_get_sectors_16(cdb); | |
988 | cmd->t_task_lba = transport_lba_64(cdb); | |
989 | } | |
6ef31dc7 CVB |
990 | if (ops->execute_sync_cache) { |
991 | cmd->execute_cmd = ops->execute_sync_cache; | |
992 | goto check_lba; | |
d6e0175c | 993 | } |
6ef31dc7 CVB |
994 | size = 0; |
995 | cmd->execute_cmd = sbc_emulate_noop; | |
d6e0175c CH |
996 | break; |
997 | case UNMAP: | |
14150a6b | 998 | if (!ops->execute_unmap) |
de103c93 | 999 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
14150a6b | 1000 | |
61fdb4ac NB |
1001 | if (!dev->dev_attrib.emulate_tpu) { |
1002 | pr_err("Got UNMAP, but backend device has" | |
1003 | " emulate_tpu disabled\n"); | |
1004 | return TCM_UNSUPPORTED_SCSI_OPCODE; | |
1005 | } | |
1fd032ee | 1006 | size = get_unaligned_be16(&cdb[7]); |
14150a6b | 1007 | cmd->execute_cmd = ops->execute_unmap; |
d6e0175c CH |
1008 | break; |
1009 | case WRITE_SAME_16: | |
1010 | sectors = transport_get_sectors_16(cdb); | |
1011 | if (!sectors) { | |
1012 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); | |
de103c93 | 1013 | return TCM_INVALID_CDB_FIELD; |
d6e0175c CH |
1014 | } |
1015 | ||
1fd032ee | 1016 | size = sbc_get_size(cmd, 1); |
d6e0175c CH |
1017 | cmd->t_task_lba = get_unaligned_be64(&cdb[2]); |
1018 | ||
cd063bef | 1019 | ret = sbc_setup_write_same(cmd, &cdb[1], ops); |
6b64e1fe | 1020 | if (ret) |
cd063bef | 1021 | return ret; |
d6e0175c CH |
1022 | break; |
1023 | case WRITE_SAME: | |
1024 | sectors = transport_get_sectors_10(cdb); | |
1025 | if (!sectors) { | |
1026 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); | |
de103c93 | 1027 | return TCM_INVALID_CDB_FIELD; |
d6e0175c CH |
1028 | } |
1029 | ||
1fd032ee | 1030 | size = sbc_get_size(cmd, 1); |
d6e0175c CH |
1031 | cmd->t_task_lba = get_unaligned_be32(&cdb[2]); |
1032 | ||
1033 | /* | |
1034 | * Follow sbcr26 with WRITE_SAME (10) and check for the existence | |
1035 | * of byte 1 bit 3 UNMAP instead of original reserved field | |
1036 | */ | |
cd063bef | 1037 | ret = sbc_setup_write_same(cmd, &cdb[1], ops); |
6b64e1fe | 1038 | if (ret) |
cd063bef | 1039 | return ret; |
d6e0175c CH |
1040 | break; |
1041 | case VERIFY: | |
1fd032ee | 1042 | size = 0; |
c52716de CVB |
1043 | sectors = transport_get_sectors_10(cdb); |
1044 | cmd->t_task_lba = transport_lba_32(cdb); | |
1920ed61 | 1045 | cmd->execute_cmd = sbc_emulate_noop; |
c52716de | 1046 | goto check_lba; |
1a1ff38c BK |
1047 | case REZERO_UNIT: |
1048 | case SEEK_6: | |
1049 | case SEEK_10: | |
1050 | /* | |
1051 | * There are still clients out there which use these old SCSI-2 | |
1052 | * commands. This mainly happens when running VMs with legacy | |
1053 | * guest systems, connected via SCSI command pass-through to | |
1054 | * iSCSI targets. Make them happy and return status GOOD. | |
1055 | */ | |
1056 | size = 0; | |
1057 | cmd->execute_cmd = sbc_emulate_noop; | |
1058 | break; | |
d6e0175c | 1059 | default: |
1fd032ee | 1060 | ret = spc_parse_cdb(cmd, &size); |
d6e0175c CH |
1061 | if (ret) |
1062 | return ret; | |
1063 | } | |
1064 | ||
1065 | /* reject any command that we don't have a handler for */ | |
20959c4b | 1066 | if (!cmd->execute_cmd) |
de103c93 | 1067 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
d6e0175c CH |
1068 | |
1069 | if (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) { | |
1fd032ee | 1070 | unsigned long long end_lba; |
6ef31dc7 | 1071 | check_lba: |
1fd032ee | 1072 | end_lba = dev->transport->get_blocks(dev) + 1; |
aa179935 NB |
1073 | if (((cmd->t_task_lba + sectors) < cmd->t_task_lba) || |
1074 | ((cmd->t_task_lba + sectors) > end_lba)) { | |
1fd032ee CH |
1075 | pr_err("cmd exceeds last lba %llu " |
1076 | "(lba %llu, sectors %u)\n", | |
1077 | end_lba, cmd->t_task_lba, sectors); | |
09ceadc7 | 1078 | return TCM_ADDRESS_OUT_OF_RANGE; |
1fd032ee CH |
1079 | } |
1080 | ||
68ff9b9b NB |
1081 | if (!(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) |
1082 | size = sbc_get_size(cmd, sectors); | |
d6e0175c CH |
1083 | } |
1084 | ||
de103c93 | 1085 | return target_cmd_size_check(cmd, size); |
d6e0175c CH |
1086 | } |
1087 | EXPORT_SYMBOL(sbc_parse_cdb); | |
6f23ac8a | 1088 | |
6f23ac8a CH |
1089 | u32 sbc_get_device_type(struct se_device *dev) |
1090 | { | |
1091 | return TYPE_DISK; | |
1092 | } | |
1093 | EXPORT_SYMBOL(sbc_get_device_type); | |
86d71829 AH |
1094 | |
1095 | sense_reason_t | |
1096 | sbc_execute_unmap(struct se_cmd *cmd, | |
1097 | sense_reason_t (*do_unmap_fn)(struct se_cmd *, void *, | |
1098 | sector_t, sector_t), | |
1099 | void *priv) | |
1100 | { | |
1101 | struct se_device *dev = cmd->se_dev; | |
1102 | unsigned char *buf, *ptr = NULL; | |
1103 | sector_t lba; | |
1104 | int size; | |
1105 | u32 range; | |
1106 | sense_reason_t ret = 0; | |
1107 | int dl, bd_dl; | |
1108 | ||
1109 | /* We never set ANC_SUP */ | |
1110 | if (cmd->t_task_cdb[1]) | |
1111 | return TCM_INVALID_CDB_FIELD; | |
1112 | ||
1113 | if (cmd->data_length == 0) { | |
1114 | target_complete_cmd(cmd, SAM_STAT_GOOD); | |
1115 | return 0; | |
1116 | } | |
1117 | ||
1118 | if (cmd->data_length < 8) { | |
1119 | pr_warn("UNMAP parameter list length %u too small\n", | |
1120 | cmd->data_length); | |
1121 | return TCM_PARAMETER_LIST_LENGTH_ERROR; | |
1122 | } | |
1123 | ||
1124 | buf = transport_kmap_data_sg(cmd); | |
1125 | if (!buf) | |
1126 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
1127 | ||
1128 | dl = get_unaligned_be16(&buf[0]); | |
1129 | bd_dl = get_unaligned_be16(&buf[2]); | |
1130 | ||
1131 | size = cmd->data_length - 8; | |
1132 | if (bd_dl > size) | |
1133 | pr_warn("UNMAP parameter list length %u too small, ignoring bd_dl %u\n", | |
1134 | cmd->data_length, bd_dl); | |
1135 | else | |
1136 | size = bd_dl; | |
1137 | ||
1138 | if (size / 16 > dev->dev_attrib.max_unmap_block_desc_count) { | |
1139 | ret = TCM_INVALID_PARAMETER_LIST; | |
1140 | goto err; | |
1141 | } | |
1142 | ||
1143 | /* First UNMAP block descriptor starts at 8 byte offset */ | |
1144 | ptr = &buf[8]; | |
1145 | pr_debug("UNMAP: Sub: %s Using dl: %u bd_dl: %u size: %u" | |
1146 | " ptr: %p\n", dev->transport->name, dl, bd_dl, size, ptr); | |
1147 | ||
1148 | while (size >= 16) { | |
1149 | lba = get_unaligned_be64(&ptr[0]); | |
1150 | range = get_unaligned_be32(&ptr[8]); | |
1151 | pr_debug("UNMAP: Using lba: %llu and range: %u\n", | |
1152 | (unsigned long long)lba, range); | |
1153 | ||
1154 | if (range > dev->dev_attrib.max_unmap_lba_count) { | |
1155 | ret = TCM_INVALID_PARAMETER_LIST; | |
1156 | goto err; | |
1157 | } | |
1158 | ||
1159 | if (lba + range > dev->transport->get_blocks(dev) + 1) { | |
1160 | ret = TCM_ADDRESS_OUT_OF_RANGE; | |
1161 | goto err; | |
1162 | } | |
1163 | ||
1164 | ret = do_unmap_fn(cmd, priv, lba, range); | |
1165 | if (ret) | |
1166 | goto err; | |
1167 | ||
1168 | ptr += 16; | |
1169 | size -= 16; | |
1170 | } | |
1171 | ||
1172 | err: | |
1173 | transport_kunmap_data_sg(cmd); | |
1174 | if (!ret) | |
1175 | target_complete_cmd(cmd, GOOD); | |
1176 | return ret; | |
1177 | } | |
1178 | EXPORT_SYMBOL(sbc_execute_unmap); | |
41861fa8 | 1179 | |
66a3d5bc NB |
1180 | void |
1181 | sbc_dif_generate(struct se_cmd *cmd) | |
1182 | { | |
1183 | struct se_device *dev = cmd->se_dev; | |
1184 | struct se_dif_v1_tuple *sdt; | |
1185 | struct scatterlist *dsg, *psg = cmd->t_prot_sg; | |
1186 | sector_t sector = cmd->t_task_lba; | |
1187 | void *daddr, *paddr; | |
1188 | int i, j, offset = 0; | |
1189 | ||
1190 | for_each_sg(cmd->t_data_sg, dsg, cmd->t_data_nents, i) { | |
1191 | daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; | |
1192 | paddr = kmap_atomic(sg_page(psg)) + psg->offset; | |
1193 | ||
1194 | for (j = 0; j < dsg->length; j += dev->dev_attrib.block_size) { | |
1195 | ||
1196 | if (offset >= psg->length) { | |
1197 | kunmap_atomic(paddr); | |
1198 | psg = sg_next(psg); | |
1199 | paddr = kmap_atomic(sg_page(psg)) + psg->offset; | |
1200 | offset = 0; | |
1201 | } | |
1202 | ||
1203 | sdt = paddr + offset; | |
1204 | sdt->guard_tag = cpu_to_be16(crc_t10dif(daddr + j, | |
1205 | dev->dev_attrib.block_size)); | |
823ddd87 | 1206 | if (cmd->prot_type == TARGET_DIF_TYPE1_PROT) |
66a3d5bc NB |
1207 | sdt->ref_tag = cpu_to_be32(sector & 0xffffffff); |
1208 | sdt->app_tag = 0; | |
1209 | ||
6ae50408 | 1210 | pr_debug("DIF %s INSERT sector: %llu guard_tag: 0x%04x" |
66a3d5bc | 1211 | " app_tag: 0x%04x ref_tag: %u\n", |
6ae50408 NB |
1212 | (cmd->data_direction == DMA_TO_DEVICE) ? |
1213 | "WRITE" : "READ", (unsigned long long)sector, | |
1214 | sdt->guard_tag, sdt->app_tag, | |
1215 | be32_to_cpu(sdt->ref_tag)); | |
66a3d5bc NB |
1216 | |
1217 | sector++; | |
1218 | offset += sizeof(struct se_dif_v1_tuple); | |
1219 | } | |
1220 | ||
1221 | kunmap_atomic(paddr); | |
1222 | kunmap_atomic(daddr); | |
1223 | } | |
1224 | } | |
1225 | ||
41861fa8 | 1226 | static sense_reason_t |
823ddd87 | 1227 | sbc_dif_v1_verify(struct se_cmd *cmd, struct se_dif_v1_tuple *sdt, |
41861fa8 NB |
1228 | const void *p, sector_t sector, unsigned int ei_lba) |
1229 | { | |
823ddd87 | 1230 | struct se_device *dev = cmd->se_dev; |
41861fa8 NB |
1231 | int block_size = dev->dev_attrib.block_size; |
1232 | __be16 csum; | |
1233 | ||
d7a463b0 NB |
1234 | if (!(cmd->prot_checks & TARGET_DIF_CHECK_GUARD)) |
1235 | goto check_ref; | |
1236 | ||
41861fa8 NB |
1237 | csum = cpu_to_be16(crc_t10dif(p, block_size)); |
1238 | ||
1239 | if (sdt->guard_tag != csum) { | |
1240 | pr_err("DIFv1 checksum failed on sector %llu guard tag 0x%04x" | |
1241 | " csum 0x%04x\n", (unsigned long long)sector, | |
1242 | be16_to_cpu(sdt->guard_tag), be16_to_cpu(csum)); | |
1243 | return TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED; | |
1244 | } | |
1245 | ||
d7a463b0 NB |
1246 | check_ref: |
1247 | if (!(cmd->prot_checks & TARGET_DIF_CHECK_REFTAG)) | |
1248 | return 0; | |
1249 | ||
823ddd87 | 1250 | if (cmd->prot_type == TARGET_DIF_TYPE1_PROT && |
41861fa8 NB |
1251 | be32_to_cpu(sdt->ref_tag) != (sector & 0xffffffff)) { |
1252 | pr_err("DIFv1 Type 1 reference failed on sector: %llu tag: 0x%08x" | |
1253 | " sector MSB: 0x%08x\n", (unsigned long long)sector, | |
1254 | be32_to_cpu(sdt->ref_tag), (u32)(sector & 0xffffffff)); | |
1255 | return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED; | |
1256 | } | |
1257 | ||
823ddd87 | 1258 | if (cmd->prot_type == TARGET_DIF_TYPE2_PROT && |
41861fa8 NB |
1259 | be32_to_cpu(sdt->ref_tag) != ei_lba) { |
1260 | pr_err("DIFv1 Type 2 reference failed on sector: %llu tag: 0x%08x" | |
1261 | " ei_lba: 0x%08x\n", (unsigned long long)sector, | |
1262 | be32_to_cpu(sdt->ref_tag), ei_lba); | |
1263 | return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED; | |
1264 | } | |
1265 | ||
1266 | return 0; | |
1267 | } | |
1268 | ||
1269 | static void | |
1270 | sbc_dif_copy_prot(struct se_cmd *cmd, unsigned int sectors, bool read, | |
1271 | struct scatterlist *sg, int sg_off) | |
1272 | { | |
1273 | struct se_device *dev = cmd->se_dev; | |
1274 | struct scatterlist *psg; | |
1275 | void *paddr, *addr; | |
1276 | unsigned int i, len, left; | |
10762e80 | 1277 | unsigned int offset = sg_off; |
41861fa8 | 1278 | |
38b57f82 NB |
1279 | if (!sg) |
1280 | return; | |
1281 | ||
41861fa8 NB |
1282 | left = sectors * dev->prot_length; |
1283 | ||
1284 | for_each_sg(cmd->t_prot_sg, psg, cmd->t_prot_nents, i) { | |
16c0ae02 | 1285 | unsigned int psg_len, copied = 0; |
d6a65fdc | 1286 | |
41861fa8 | 1287 | paddr = kmap_atomic(sg_page(psg)) + psg->offset; |
16c0ae02 SG |
1288 | psg_len = min(left, psg->length); |
1289 | while (psg_len) { | |
1290 | len = min(psg_len, sg->length - offset); | |
1291 | addr = kmap_atomic(sg_page(sg)) + sg->offset + offset; | |
1292 | ||
1293 | if (read) | |
1294 | memcpy(paddr + copied, addr, len); | |
1295 | else | |
1296 | memcpy(addr, paddr + copied, len); | |
1297 | ||
1298 | left -= len; | |
1299 | offset += len; | |
1300 | copied += len; | |
1301 | psg_len -= len; | |
1302 | ||
1303 | if (offset >= sg->length) { | |
1304 | sg = sg_next(sg); | |
1305 | offset = 0; | |
1306 | } | |
1307 | kunmap_atomic(addr); | |
1308 | } | |
41861fa8 | 1309 | kunmap_atomic(paddr); |
41861fa8 NB |
1310 | } |
1311 | } | |
1312 | ||
1313 | sense_reason_t | |
1314 | sbc_dif_verify_write(struct se_cmd *cmd, sector_t start, unsigned int sectors, | |
1315 | unsigned int ei_lba, struct scatterlist *sg, int sg_off) | |
1316 | { | |
1317 | struct se_device *dev = cmd->se_dev; | |
1318 | struct se_dif_v1_tuple *sdt; | |
1319 | struct scatterlist *dsg, *psg = cmd->t_prot_sg; | |
1320 | sector_t sector = start; | |
1321 | void *daddr, *paddr; | |
1322 | int i, j, offset = 0; | |
1323 | sense_reason_t rc; | |
1324 | ||
1325 | for_each_sg(cmd->t_data_sg, dsg, cmd->t_data_nents, i) { | |
1326 | daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; | |
1327 | paddr = kmap_atomic(sg_page(psg)) + psg->offset; | |
1328 | ||
1329 | for (j = 0; j < dsg->length; j += dev->dev_attrib.block_size) { | |
1330 | ||
1331 | if (offset >= psg->length) { | |
1332 | kunmap_atomic(paddr); | |
1333 | psg = sg_next(psg); | |
1334 | paddr = kmap_atomic(sg_page(psg)) + psg->offset; | |
1335 | offset = 0; | |
1336 | } | |
1337 | ||
1338 | sdt = paddr + offset; | |
1339 | ||
1340 | pr_debug("DIF WRITE sector: %llu guard_tag: 0x%04x" | |
1341 | " app_tag: 0x%04x ref_tag: %u\n", | |
1342 | (unsigned long long)sector, sdt->guard_tag, | |
1343 | sdt->app_tag, be32_to_cpu(sdt->ref_tag)); | |
1344 | ||
823ddd87 | 1345 | rc = sbc_dif_v1_verify(cmd, sdt, daddr + j, sector, |
41861fa8 NB |
1346 | ei_lba); |
1347 | if (rc) { | |
1348 | kunmap_atomic(paddr); | |
1349 | kunmap_atomic(daddr); | |
76736db3 | 1350 | cmd->bad_sector = sector; |
41861fa8 NB |
1351 | return rc; |
1352 | } | |
1353 | ||
1354 | sector++; | |
1355 | ei_lba++; | |
1356 | offset += sizeof(struct se_dif_v1_tuple); | |
1357 | } | |
1358 | ||
1359 | kunmap_atomic(paddr); | |
1360 | kunmap_atomic(daddr); | |
1361 | } | |
5132d1e6 NB |
1362 | if (!sg) |
1363 | return 0; | |
1364 | ||
41861fa8 NB |
1365 | sbc_dif_copy_prot(cmd, sectors, false, sg, sg_off); |
1366 | ||
1367 | return 0; | |
1368 | } | |
1369 | EXPORT_SYMBOL(sbc_dif_verify_write); | |
1370 | ||
395ccb25 NB |
1371 | static sense_reason_t |
1372 | __sbc_dif_verify_read(struct se_cmd *cmd, sector_t start, unsigned int sectors, | |
1373 | unsigned int ei_lba, struct scatterlist *sg, int sg_off) | |
41861fa8 NB |
1374 | { |
1375 | struct se_device *dev = cmd->se_dev; | |
1376 | struct se_dif_v1_tuple *sdt; | |
fc272ec7 | 1377 | struct scatterlist *dsg, *psg = sg; |
41861fa8 NB |
1378 | sector_t sector = start; |
1379 | void *daddr, *paddr; | |
1380 | int i, j, offset = sg_off; | |
1381 | sense_reason_t rc; | |
1382 | ||
1383 | for_each_sg(cmd->t_data_sg, dsg, cmd->t_data_nents, i) { | |
1384 | daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; | |
fc272ec7 | 1385 | paddr = kmap_atomic(sg_page(psg)) + sg->offset; |
41861fa8 NB |
1386 | |
1387 | for (j = 0; j < dsg->length; j += dev->dev_attrib.block_size) { | |
1388 | ||
fc272ec7 | 1389 | if (offset >= psg->length) { |
41861fa8 | 1390 | kunmap_atomic(paddr); |
fc272ec7 SG |
1391 | psg = sg_next(psg); |
1392 | paddr = kmap_atomic(sg_page(psg)) + psg->offset; | |
41861fa8 NB |
1393 | offset = 0; |
1394 | } | |
1395 | ||
1396 | sdt = paddr + offset; | |
1397 | ||
1398 | pr_debug("DIF READ sector: %llu guard_tag: 0x%04x" | |
1399 | " app_tag: 0x%04x ref_tag: %u\n", | |
1400 | (unsigned long long)sector, sdt->guard_tag, | |
1401 | sdt->app_tag, be32_to_cpu(sdt->ref_tag)); | |
1402 | ||
1403 | if (sdt->app_tag == cpu_to_be16(0xffff)) { | |
1404 | sector++; | |
1405 | offset += sizeof(struct se_dif_v1_tuple); | |
1406 | continue; | |
1407 | } | |
1408 | ||
823ddd87 | 1409 | rc = sbc_dif_v1_verify(cmd, sdt, daddr + j, sector, |
41861fa8 NB |
1410 | ei_lba); |
1411 | if (rc) { | |
1412 | kunmap_atomic(paddr); | |
1413 | kunmap_atomic(daddr); | |
76736db3 | 1414 | cmd->bad_sector = sector; |
41861fa8 NB |
1415 | return rc; |
1416 | } | |
1417 | ||
1418 | sector++; | |
1419 | ei_lba++; | |
1420 | offset += sizeof(struct se_dif_v1_tuple); | |
1421 | } | |
1422 | ||
1423 | kunmap_atomic(paddr); | |
1424 | kunmap_atomic(daddr); | |
1425 | } | |
41861fa8 NB |
1426 | |
1427 | return 0; | |
1428 | } | |
395ccb25 NB |
1429 | |
1430 | sense_reason_t | |
1431 | sbc_dif_read_strip(struct se_cmd *cmd) | |
1432 | { | |
1433 | struct se_device *dev = cmd->se_dev; | |
1434 | u32 sectors = cmd->prot_length / dev->prot_length; | |
1435 | ||
1436 | return __sbc_dif_verify_read(cmd, cmd->t_task_lba, sectors, 0, | |
1437 | cmd->t_prot_sg, 0); | |
1438 | } | |
1439 | ||
1440 | sense_reason_t | |
1441 | sbc_dif_verify_read(struct se_cmd *cmd, sector_t start, unsigned int sectors, | |
1442 | unsigned int ei_lba, struct scatterlist *sg, int sg_off) | |
1443 | { | |
1444 | sense_reason_t rc; | |
1445 | ||
1446 | rc = __sbc_dif_verify_read(cmd, start, sectors, ei_lba, sg, sg_off); | |
1447 | if (rc) | |
1448 | return rc; | |
1449 | ||
1450 | sbc_dif_copy_prot(cmd, sectors, true, sg, sg_off); | |
1451 | return 0; | |
1452 | } | |
41861fa8 | 1453 | EXPORT_SYMBOL(sbc_dif_verify_read); |