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1a59d1b8 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
d6e0175c CH |
2 | /* |
3 | * SCSI Block Commands (SBC) parsing and emulation. | |
4 | * | |
4c76251e | 5 | * (c) Copyright 2002-2013 Datera, Inc. |
d6e0175c CH |
6 | * |
7 | * Nicholas A. Bellinger <nab@kernel.org> | |
d6e0175c CH |
8 | */ |
9 | ||
10 | #include <linux/kernel.h> | |
11 | #include <linux/module.h> | |
12 | #include <linux/ratelimit.h> | |
41861fa8 | 13 | #include <linux/crc-t10dif.h> |
8dcf07be | 14 | #include <linux/t10-pi.h> |
d6e0175c | 15 | #include <asm/unaligned.h> |
ba929992 | 16 | #include <scsi/scsi_proto.h> |
68ff9b9b | 17 | #include <scsi/scsi_tcq.h> |
d6e0175c CH |
18 | |
19 | #include <target/target_core_base.h> | |
20 | #include <target/target_core_backend.h> | |
21 | #include <target/target_core_fabric.h> | |
22 | ||
23 | #include "target_core_internal.h" | |
24 | #include "target_core_ua.h" | |
c66094bf | 25 | #include "target_core_alua.h" |
d6e0175c | 26 | |
afd73f1b NB |
27 | static sense_reason_t |
28 | sbc_check_prot(struct se_device *, struct se_cmd *, unsigned char *, u32, bool); | |
62e46942 | 29 | static sense_reason_t sbc_execute_unmap(struct se_cmd *cmd); |
afd73f1b | 30 | |
de103c93 CH |
31 | static sense_reason_t |
32 | sbc_emulate_readcapacity(struct se_cmd *cmd) | |
1fd032ee CH |
33 | { |
34 | struct se_device *dev = cmd->se_dev; | |
8dc8632a | 35 | unsigned char *cdb = cmd->t_task_cdb; |
1fd032ee | 36 | unsigned long long blocks_long = dev->transport->get_blocks(dev); |
a50da144 PB |
37 | unsigned char *rbuf; |
38 | unsigned char buf[8]; | |
1fd032ee CH |
39 | u32 blocks; |
40 | ||
8dc8632a RD |
41 | /* |
42 | * SBC-2 says: | |
43 | * If the PMI bit is set to zero and the LOGICAL BLOCK | |
44 | * ADDRESS field is not set to zero, the device server shall | |
45 | * terminate the command with CHECK CONDITION status with | |
46 | * the sense key set to ILLEGAL REQUEST and the additional | |
47 | * sense code set to INVALID FIELD IN CDB. | |
48 | * | |
49 | * In SBC-3, these fields are obsolete, but some SCSI | |
50 | * compliance tests actually check this, so we might as well | |
51 | * follow SBC-2. | |
52 | */ | |
53 | if (!(cdb[8] & 1) && !!(cdb[2] | cdb[3] | cdb[4] | cdb[5])) | |
54 | return TCM_INVALID_CDB_FIELD; | |
55 | ||
1fd032ee CH |
56 | if (blocks_long >= 0x00000000ffffffff) |
57 | blocks = 0xffffffff; | |
58 | else | |
59 | blocks = (u32)blocks_long; | |
60 | ||
a85d667e BVA |
61 | put_unaligned_be32(blocks, &buf[0]); |
62 | put_unaligned_be32(dev->dev_attrib.block_size, &buf[4]); | |
1fd032ee | 63 | |
a50da144 | 64 | rbuf = transport_kmap_data_sg(cmd); |
8b4b0dcb NB |
65 | if (rbuf) { |
66 | memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length)); | |
67 | transport_kunmap_data_sg(cmd); | |
68 | } | |
1fd032ee | 69 | |
2426bd45 | 70 | target_complete_cmd_with_length(cmd, GOOD, 8); |
1fd032ee CH |
71 | return 0; |
72 | } | |
73 | ||
de103c93 CH |
74 | static sense_reason_t |
75 | sbc_emulate_readcapacity_16(struct se_cmd *cmd) | |
1fd032ee CH |
76 | { |
77 | struct se_device *dev = cmd->se_dev; | |
2d335983 | 78 | struct se_session *sess = cmd->se_sess; |
9ef5466e NB |
79 | int pi_prot_type = dev->dev_attrib.pi_prot_type; |
80 | ||
a50da144 PB |
81 | unsigned char *rbuf; |
82 | unsigned char buf[32]; | |
1fd032ee CH |
83 | unsigned long long blocks = dev->transport->get_blocks(dev); |
84 | ||
a50da144 | 85 | memset(buf, 0, sizeof(buf)); |
a85d667e BVA |
86 | put_unaligned_be64(blocks, &buf[0]); |
87 | put_unaligned_be32(dev->dev_attrib.block_size, &buf[8]); | |
56dac14c NB |
88 | /* |
89 | * Set P_TYPE and PROT_EN bits for DIF support | |
90 | */ | |
2d335983 | 91 | if (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) { |
9ef5466e NB |
92 | /* |
93 | * Only override a device's pi_prot_type if no T10-PI is | |
94 | * available, and sess_prot_type has been explicitly enabled. | |
95 | */ | |
96 | if (!pi_prot_type) | |
97 | pi_prot_type = sess->sess_prot_type; | |
98 | ||
99 | if (pi_prot_type) | |
100 | buf[12] = (pi_prot_type - 1) << 1 | 0x1; | |
2d335983 | 101 | } |
7f7caf6a AG |
102 | |
103 | if (dev->transport->get_lbppbe) | |
104 | buf[13] = dev->transport->get_lbppbe(dev) & 0x0f; | |
105 | ||
106 | if (dev->transport->get_alignment_offset_lbas) { | |
107 | u16 lalba = dev->transport->get_alignment_offset_lbas(dev); | |
a85d667e BVA |
108 | |
109 | put_unaligned_be16(lalba, &buf[14]); | |
7f7caf6a AG |
110 | } |
111 | ||
1fd032ee CH |
112 | /* |
113 | * Set Thin Provisioning Enable bit following sbc3r22 in section | |
114 | * READ CAPACITY (16) byte 14 if emulate_tpu or emulate_tpws is enabled. | |
115 | */ | |
e6f41633 | 116 | if (dev->dev_attrib.emulate_tpu || dev->dev_attrib.emulate_tpws) { |
7f7caf6a | 117 | buf[14] |= 0x80; |
1fd032ee | 118 | |
e6f41633 JP |
119 | /* |
120 | * LBPRZ signifies that zeroes will be read back from an LBA after | |
121 | * an UNMAP or WRITE SAME w/ unmap bit (sbc3r36 5.16.2) | |
122 | */ | |
123 | if (dev->dev_attrib.unmap_zeroes_data) | |
124 | buf[14] |= 0x40; | |
125 | } | |
126 | ||
a50da144 | 127 | rbuf = transport_kmap_data_sg(cmd); |
8b4b0dcb NB |
128 | if (rbuf) { |
129 | memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length)); | |
130 | transport_kunmap_data_sg(cmd); | |
131 | } | |
1fd032ee | 132 | |
2426bd45 | 133 | target_complete_cmd_with_length(cmd, GOOD, 32); |
1fd032ee CH |
134 | return 0; |
135 | } | |
136 | ||
45182ed5 BB |
137 | static sense_reason_t |
138 | sbc_emulate_startstop(struct se_cmd *cmd) | |
139 | { | |
140 | unsigned char *cdb = cmd->t_task_cdb; | |
141 | ||
142 | /* | |
143 | * See sbc3r36 section 5.25 | |
144 | * Immediate bit should be set since there is nothing to complete | |
145 | * POWER CONDITION MODIFIER 0h | |
146 | */ | |
147 | if (!(cdb[1] & 1) || cdb[2] || cdb[3]) | |
148 | return TCM_INVALID_CDB_FIELD; | |
149 | ||
150 | /* | |
151 | * See sbc3r36 section 5.25 | |
152 | * POWER CONDITION 0h START_VALID - process START and LOEJ | |
153 | */ | |
154 | if (cdb[4] >> 4 & 0xf) | |
155 | return TCM_INVALID_CDB_FIELD; | |
156 | ||
157 | /* | |
158 | * See sbc3r36 section 5.25 | |
159 | * LOEJ 0h - nothing to load or unload | |
160 | * START 1h - we are ready | |
161 | */ | |
162 | if (!(cdb[4] & 1) || (cdb[4] & 2) || (cdb[4] & 4)) | |
163 | return TCM_INVALID_CDB_FIELD; | |
164 | ||
165 | target_complete_cmd(cmd, SAM_STAT_GOOD); | |
166 | return 0; | |
167 | } | |
168 | ||
972b29c8 | 169 | sector_t sbc_get_write_same_sectors(struct se_cmd *cmd) |
1fd032ee | 170 | { |
1fd032ee | 171 | u32 num_blocks; |
1fd032ee CH |
172 | |
173 | if (cmd->t_task_cdb[0] == WRITE_SAME) | |
174 | num_blocks = get_unaligned_be16(&cmd->t_task_cdb[7]); | |
175 | else if (cmd->t_task_cdb[0] == WRITE_SAME_16) | |
176 | num_blocks = get_unaligned_be32(&cmd->t_task_cdb[10]); | |
177 | else /* WRITE_SAME_32 via VARIABLE_LENGTH_CMD */ | |
178 | num_blocks = get_unaligned_be32(&cmd->t_task_cdb[28]); | |
179 | ||
180 | /* | |
181 | * Use the explicit range when non zero is supplied, otherwise calculate | |
182 | * the remaining range based on ->get_blocks() - starting LBA. | |
183 | */ | |
6f974e8c CH |
184 | if (num_blocks) |
185 | return num_blocks; | |
1fd032ee | 186 | |
6f974e8c CH |
187 | return cmd->se_dev->transport->get_blocks(cmd->se_dev) - |
188 | cmd->t_task_lba + 1; | |
1fd032ee | 189 | } |
972b29c8 | 190 | EXPORT_SYMBOL(sbc_get_write_same_sectors); |
1fd032ee | 191 | |
b753d643 CH |
192 | static sense_reason_t |
193 | sbc_execute_write_same_unmap(struct se_cmd *cmd) | |
194 | { | |
195 | struct sbc_ops *ops = cmd->protocol_data; | |
196 | sector_t nolb = sbc_get_write_same_sectors(cmd); | |
197 | sense_reason_t ret; | |
198 | ||
199 | if (nolb) { | |
200 | ret = ops->execute_unmap(cmd, cmd->t_task_lba, nolb); | |
201 | if (ret) | |
202 | return ret; | |
203 | } | |
204 | ||
205 | target_complete_cmd(cmd, GOOD); | |
206 | return 0; | |
207 | } | |
208 | ||
de103c93 | 209 | static sense_reason_t |
1920ed61 | 210 | sbc_emulate_noop(struct se_cmd *cmd) |
1a1ff38c BK |
211 | { |
212 | target_complete_cmd(cmd, GOOD); | |
213 | return 0; | |
214 | } | |
215 | ||
d6e0175c CH |
216 | static inline u32 sbc_get_size(struct se_cmd *cmd, u32 sectors) |
217 | { | |
0fd97ccf | 218 | return cmd->se_dev->dev_attrib.block_size * sectors; |
d6e0175c CH |
219 | } |
220 | ||
d6e0175c CH |
221 | static inline u32 transport_get_sectors_6(unsigned char *cdb) |
222 | { | |
223 | /* | |
224 | * Use 8-bit sector value. SBC-3 says: | |
225 | * | |
226 | * A TRANSFER LENGTH field set to zero specifies that 256 | |
227 | * logical blocks shall be written. Any other value | |
228 | * specifies the number of logical blocks that shall be | |
229 | * written. | |
230 | */ | |
231 | return cdb[4] ? : 256; | |
232 | } | |
233 | ||
234 | static inline u32 transport_get_sectors_10(unsigned char *cdb) | |
235 | { | |
a85d667e | 236 | return get_unaligned_be16(&cdb[7]); |
d6e0175c CH |
237 | } |
238 | ||
239 | static inline u32 transport_get_sectors_12(unsigned char *cdb) | |
240 | { | |
a85d667e | 241 | return get_unaligned_be32(&cdb[6]); |
d6e0175c CH |
242 | } |
243 | ||
244 | static inline u32 transport_get_sectors_16(unsigned char *cdb) | |
245 | { | |
a85d667e | 246 | return get_unaligned_be32(&cdb[10]); |
d6e0175c CH |
247 | } |
248 | ||
249 | /* | |
250 | * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants | |
251 | */ | |
252 | static inline u32 transport_get_sectors_32(unsigned char *cdb) | |
253 | { | |
a85d667e | 254 | return get_unaligned_be32(&cdb[28]); |
d6e0175c CH |
255 | |
256 | } | |
257 | ||
258 | static inline u32 transport_lba_21(unsigned char *cdb) | |
259 | { | |
a85d667e | 260 | return get_unaligned_be24(&cdb[1]) & 0x1fffff; |
d6e0175c CH |
261 | } |
262 | ||
263 | static inline u32 transport_lba_32(unsigned char *cdb) | |
264 | { | |
a85d667e | 265 | return get_unaligned_be32(&cdb[2]); |
d6e0175c CH |
266 | } |
267 | ||
268 | static inline unsigned long long transport_lba_64(unsigned char *cdb) | |
269 | { | |
a85d667e | 270 | return get_unaligned_be64(&cdb[2]); |
d6e0175c CH |
271 | } |
272 | ||
273 | /* | |
274 | * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs | |
275 | */ | |
276 | static inline unsigned long long transport_lba_64_ext(unsigned char *cdb) | |
277 | { | |
a85d667e | 278 | return get_unaligned_be64(&cdb[12]); |
d6e0175c CH |
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 | ||
057085e5 NB |
342 | static sense_reason_t xdreadwrite_callback(struct se_cmd *cmd, bool success, |
343 | int *post_ret) | |
d6e0175c CH |
344 | { |
345 | unsigned char *buf, *addr; | |
346 | struct scatterlist *sg; | |
347 | unsigned int offset; | |
a6b0133c NB |
348 | sense_reason_t ret = TCM_NO_SENSE; |
349 | int i, count; | |
aa73237d BVA |
350 | |
351 | if (!success) | |
352 | return 0; | |
353 | ||
d6e0175c CH |
354 | /* |
355 | * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command | |
356 | * | |
357 | * 1) read the specified logical block(s); | |
358 | * 2) transfer logical blocks from the data-out buffer; | |
359 | * 3) XOR the logical blocks transferred from the data-out buffer with | |
360 | * the logical blocks read, storing the resulting XOR data in a buffer; | |
361 | * 4) if the DISABLE WRITE bit is set to zero, then write the logical | |
362 | * blocks transferred from the data-out buffer; and | |
363 | * 5) transfer the resulting XOR data to the data-in buffer. | |
364 | */ | |
365 | buf = kmalloc(cmd->data_length, GFP_KERNEL); | |
366 | if (!buf) { | |
367 | pr_err("Unable to allocate xor_callback buf\n"); | |
a6b0133c | 368 | return TCM_OUT_OF_RESOURCES; |
d6e0175c CH |
369 | } |
370 | /* | |
371 | * Copy the scatterlist WRITE buffer located at cmd->t_data_sg | |
372 | * into the locally allocated *buf | |
373 | */ | |
374 | sg_copy_to_buffer(cmd->t_data_sg, | |
375 | cmd->t_data_nents, | |
376 | buf, | |
377 | cmd->data_length); | |
378 | ||
379 | /* | |
380 | * Now perform the XOR against the BIDI read memory located at | |
381 | * cmd->t_mem_bidi_list | |
382 | */ | |
383 | ||
384 | offset = 0; | |
385 | for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) { | |
386 | addr = kmap_atomic(sg_page(sg)); | |
a6b0133c NB |
387 | if (!addr) { |
388 | ret = TCM_OUT_OF_RESOURCES; | |
d6e0175c | 389 | goto out; |
a6b0133c | 390 | } |
d6e0175c CH |
391 | |
392 | for (i = 0; i < sg->length; i++) | |
393 | *(addr + sg->offset + i) ^= *(buf + offset + i); | |
394 | ||
395 | offset += sg->length; | |
396 | kunmap_atomic(addr); | |
397 | } | |
398 | ||
399 | out: | |
400 | kfree(buf); | |
a6b0133c | 401 | return ret; |
d6e0175c CH |
402 | } |
403 | ||
a82a9538 NB |
404 | static sense_reason_t |
405 | sbc_execute_rw(struct se_cmd *cmd) | |
406 | { | |
7a971b1b CH |
407 | struct sbc_ops *ops = cmd->protocol_data; |
408 | ||
409 | return ops->execute_rw(cmd, cmd->t_data_sg, cmd->t_data_nents, | |
a82a9538 NB |
410 | cmd->data_direction); |
411 | } | |
412 | ||
057085e5 NB |
413 | static sense_reason_t compare_and_write_post(struct se_cmd *cmd, bool success, |
414 | int *post_ret) | |
68ff9b9b NB |
415 | { |
416 | struct se_device *dev = cmd->se_dev; | |
9b2792c3 | 417 | sense_reason_t ret = TCM_NO_SENSE; |
68ff9b9b | 418 | |
d8855c15 | 419 | spin_lock_irq(&cmd->t_state_lock); |
aa73237d | 420 | if (success) { |
057085e5 | 421 | *post_ret = 1; |
9b2792c3 NB |
422 | |
423 | if (cmd->scsi_status == SAM_STAT_CHECK_CONDITION) | |
424 | ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
057085e5 | 425 | } |
d8855c15 NB |
426 | spin_unlock_irq(&cmd->t_state_lock); |
427 | ||
68ff9b9b NB |
428 | /* |
429 | * Unlock ->caw_sem originally obtained during sbc_compare_and_write() | |
430 | * before the original READ I/O submission. | |
431 | */ | |
432 | up(&dev->caw_sem); | |
433 | ||
9b2792c3 | 434 | return ret; |
68ff9b9b NB |
435 | } |
436 | ||
057085e5 NB |
437 | static sense_reason_t compare_and_write_callback(struct se_cmd *cmd, bool success, |
438 | int *post_ret) | |
68ff9b9b NB |
439 | { |
440 | struct se_device *dev = cmd->se_dev; | |
81b6ca6d BVA |
441 | struct sg_table write_tbl = { }; |
442 | struct scatterlist *write_sg, *sg; | |
db60df88 | 443 | unsigned char *buf = NULL, *addr; |
68ff9b9b NB |
444 | struct sg_mapping_iter m; |
445 | unsigned int offset = 0, len; | |
446 | unsigned int nlbas = cmd->t_task_nolb; | |
447 | unsigned int block_size = dev->dev_attrib.block_size; | |
448 | unsigned int compare_len = (nlbas * block_size); | |
449 | sense_reason_t ret = TCM_NO_SENSE; | |
450 | int rc, i; | |
451 | ||
cf6d1f09 NB |
452 | /* |
453 | * Handle early failure in transport_generic_request_failure(), | |
c8e63985 | 454 | * which will not have taken ->caw_sem yet.. |
cf6d1f09 | 455 | */ |
c8e63985 | 456 | if (!success && (!cmd->t_data_sg || !cmd->t_bidi_data_sg)) |
cf6d1f09 | 457 | return TCM_NO_SENSE; |
c8e63985 NB |
458 | /* |
459 | * Handle special case for zero-length COMPARE_AND_WRITE | |
460 | */ | |
461 | if (!cmd->data_length) | |
462 | goto out; | |
db60df88 NB |
463 | /* |
464 | * Immediately exit + release dev->caw_sem if command has already | |
465 | * been failed with a non-zero SCSI status. | |
466 | */ | |
467 | if (cmd->scsi_status) { | |
a71a5dc7 | 468 | pr_debug("compare_and_write_callback: non zero scsi_status:" |
db60df88 | 469 | " 0x%02x\n", cmd->scsi_status); |
a71a5dc7 NB |
470 | *post_ret = 1; |
471 | if (cmd->scsi_status == SAM_STAT_CHECK_CONDITION) | |
472 | ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
db60df88 NB |
473 | goto out; |
474 | } | |
cf6d1f09 | 475 | |
68ff9b9b NB |
476 | buf = kzalloc(cmd->data_length, GFP_KERNEL); |
477 | if (!buf) { | |
478 | pr_err("Unable to allocate compare_and_write buf\n"); | |
a2890087 NB |
479 | ret = TCM_OUT_OF_RESOURCES; |
480 | goto out; | |
68ff9b9b NB |
481 | } |
482 | ||
81b6ca6d | 483 | if (sg_alloc_table(&write_tbl, cmd->t_data_nents, GFP_KERNEL) < 0) { |
68ff9b9b NB |
484 | pr_err("Unable to allocate compare_and_write sg\n"); |
485 | ret = TCM_OUT_OF_RESOURCES; | |
486 | goto out; | |
487 | } | |
81b6ca6d | 488 | write_sg = write_tbl.sgl; |
68ff9b9b NB |
489 | /* |
490 | * Setup verify and write data payloads from total NumberLBAs. | |
491 | */ | |
492 | rc = sg_copy_to_buffer(cmd->t_data_sg, cmd->t_data_nents, buf, | |
493 | cmd->data_length); | |
494 | if (!rc) { | |
495 | pr_err("sg_copy_to_buffer() failed for compare_and_write\n"); | |
496 | ret = TCM_OUT_OF_RESOURCES; | |
497 | goto out; | |
498 | } | |
499 | /* | |
500 | * Compare against SCSI READ payload against verify payload | |
501 | */ | |
502 | for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, i) { | |
503 | addr = (unsigned char *)kmap_atomic(sg_page(sg)); | |
504 | if (!addr) { | |
505 | ret = TCM_OUT_OF_RESOURCES; | |
506 | goto out; | |
507 | } | |
508 | ||
509 | len = min(sg->length, compare_len); | |
510 | ||
511 | if (memcmp(addr, buf + offset, len)) { | |
512 | pr_warn("Detected MISCOMPARE for addr: %p buf: %p\n", | |
513 | addr, buf + offset); | |
514 | kunmap_atomic(addr); | |
515 | goto miscompare; | |
516 | } | |
517 | kunmap_atomic(addr); | |
518 | ||
519 | offset += len; | |
520 | compare_len -= len; | |
521 | if (!compare_len) | |
522 | break; | |
523 | } | |
524 | ||
525 | i = 0; | |
526 | len = cmd->t_task_nolb * block_size; | |
527 | sg_miter_start(&m, cmd->t_data_sg, cmd->t_data_nents, SG_MITER_TO_SG); | |
528 | /* | |
529 | * Currently assumes NoLB=1 and SGLs are PAGE_SIZE.. | |
530 | */ | |
531 | while (len) { | |
532 | sg_miter_next(&m); | |
533 | ||
534 | if (block_size < PAGE_SIZE) { | |
535 | sg_set_page(&write_sg[i], m.page, block_size, | |
d94e5a61 | 536 | m.piter.sg->offset + block_size); |
68ff9b9b NB |
537 | } else { |
538 | sg_miter_next(&m); | |
539 | sg_set_page(&write_sg[i], m.page, block_size, | |
d94e5a61 | 540 | m.piter.sg->offset); |
68ff9b9b NB |
541 | } |
542 | len -= block_size; | |
543 | i++; | |
544 | } | |
545 | sg_miter_stop(&m); | |
546 | /* | |
547 | * Save the original SGL + nents values before updating to new | |
548 | * assignments, to be released in transport_free_pages() -> | |
549 | * transport_reset_sgl_orig() | |
550 | */ | |
551 | cmd->t_data_sg_orig = cmd->t_data_sg; | |
552 | cmd->t_data_sg = write_sg; | |
553 | cmd->t_data_nents_orig = cmd->t_data_nents; | |
554 | cmd->t_data_nents = 1; | |
555 | ||
68d81f40 | 556 | cmd->sam_task_attr = TCM_HEAD_TAG; |
68ff9b9b NB |
557 | cmd->transport_complete_callback = compare_and_write_post; |
558 | /* | |
559 | * Now reset ->execute_cmd() to the normal sbc_execute_rw() handler | |
560 | * for submitting the adjusted SGL to write instance user-data. | |
561 | */ | |
562 | cmd->execute_cmd = sbc_execute_rw; | |
563 | ||
564 | spin_lock_irq(&cmd->t_state_lock); | |
565 | cmd->t_state = TRANSPORT_PROCESSING; | |
fd5e64de | 566 | cmd->transport_state |= CMD_T_ACTIVE | CMD_T_SENT; |
68ff9b9b NB |
567 | spin_unlock_irq(&cmd->t_state_lock); |
568 | ||
dff0ca9e | 569 | __target_execute_cmd(cmd, false); |
68ff9b9b NB |
570 | |
571 | kfree(buf); | |
572 | return ret; | |
573 | ||
574 | miscompare: | |
575 | pr_warn("Target/%s: Send MISCOMPARE check condition and sense\n", | |
576 | dev->transport->name); | |
577 | ret = TCM_MISCOMPARE_VERIFY; | |
578 | out: | |
579 | /* | |
580 | * In the MISCOMPARE or failure case, unlock ->caw_sem obtained in | |
581 | * sbc_compare_and_write() before the original READ I/O submission. | |
582 | */ | |
583 | up(&dev->caw_sem); | |
81b6ca6d | 584 | sg_free_table(&write_tbl); |
68ff9b9b NB |
585 | kfree(buf); |
586 | return ret; | |
587 | } | |
588 | ||
589 | static sense_reason_t | |
590 | sbc_compare_and_write(struct se_cmd *cmd) | |
591 | { | |
7a971b1b | 592 | struct sbc_ops *ops = cmd->protocol_data; |
68ff9b9b NB |
593 | struct se_device *dev = cmd->se_dev; |
594 | sense_reason_t ret; | |
595 | int rc; | |
596 | /* | |
597 | * Submit the READ first for COMPARE_AND_WRITE to perform the | |
598 | * comparision using SGLs at cmd->t_bidi_data_sg.. | |
599 | */ | |
600 | rc = down_interruptible(&dev->caw_sem); | |
ee7619f2 | 601 | if (rc != 0) { |
68ff9b9b NB |
602 | cmd->transport_complete_callback = NULL; |
603 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
604 | } | |
b7191253 NB |
605 | /* |
606 | * Reset cmd->data_length to individual block_size in order to not | |
607 | * confuse backend drivers that depend on this value matching the | |
608 | * size of the I/O being submitted. | |
609 | */ | |
610 | cmd->data_length = cmd->t_task_nolb * dev->dev_attrib.block_size; | |
68ff9b9b | 611 | |
7a971b1b | 612 | ret = ops->execute_rw(cmd, cmd->t_bidi_data_sg, cmd->t_bidi_data_nents, |
68ff9b9b NB |
613 | DMA_FROM_DEVICE); |
614 | if (ret) { | |
615 | cmd->transport_complete_callback = NULL; | |
616 | up(&dev->caw_sem); | |
617 | return ret; | |
618 | } | |
619 | /* | |
620 | * Unlock of dev->caw_sem to occur in compare_and_write_callback() | |
621 | * upon MISCOMPARE, or in compare_and_write_done() upon completion | |
622 | * of WRITE instance user-data. | |
623 | */ | |
624 | return TCM_NO_SENSE; | |
625 | } | |
626 | ||
19f9361a | 627 | static int |
38b57f82 | 628 | sbc_set_prot_op_checks(u8 protect, bool fabric_prot, enum target_prot_type prot_type, |
19f9361a SG |
629 | bool is_write, struct se_cmd *cmd) |
630 | { | |
631 | if (is_write) { | |
38b57f82 NB |
632 | cmd->prot_op = fabric_prot ? TARGET_PROT_DOUT_STRIP : |
633 | protect ? TARGET_PROT_DOUT_PASS : | |
634 | TARGET_PROT_DOUT_INSERT; | |
19f9361a SG |
635 | switch (protect) { |
636 | case 0x0: | |
637 | case 0x3: | |
638 | cmd->prot_checks = 0; | |
639 | break; | |
640 | case 0x1: | |
641 | case 0x5: | |
642 | cmd->prot_checks = TARGET_DIF_CHECK_GUARD; | |
643 | if (prot_type == TARGET_DIF_TYPE1_PROT) | |
644 | cmd->prot_checks |= TARGET_DIF_CHECK_REFTAG; | |
645 | break; | |
646 | case 0x2: | |
647 | if (prot_type == TARGET_DIF_TYPE1_PROT) | |
648 | cmd->prot_checks = TARGET_DIF_CHECK_REFTAG; | |
649 | break; | |
650 | case 0x4: | |
651 | cmd->prot_checks = TARGET_DIF_CHECK_GUARD; | |
652 | break; | |
653 | default: | |
654 | pr_err("Unsupported protect field %d\n", protect); | |
655 | return -EINVAL; | |
656 | } | |
657 | } else { | |
38b57f82 NB |
658 | cmd->prot_op = fabric_prot ? TARGET_PROT_DIN_INSERT : |
659 | protect ? TARGET_PROT_DIN_PASS : | |
660 | TARGET_PROT_DIN_STRIP; | |
19f9361a SG |
661 | switch (protect) { |
662 | case 0x0: | |
663 | case 0x1: | |
664 | case 0x5: | |
665 | cmd->prot_checks = TARGET_DIF_CHECK_GUARD; | |
666 | if (prot_type == TARGET_DIF_TYPE1_PROT) | |
667 | cmd->prot_checks |= TARGET_DIF_CHECK_REFTAG; | |
668 | break; | |
669 | case 0x2: | |
670 | if (prot_type == TARGET_DIF_TYPE1_PROT) | |
671 | cmd->prot_checks = TARGET_DIF_CHECK_REFTAG; | |
672 | break; | |
673 | case 0x3: | |
674 | cmd->prot_checks = 0; | |
675 | break; | |
676 | case 0x4: | |
677 | cmd->prot_checks = TARGET_DIF_CHECK_GUARD; | |
678 | break; | |
679 | default: | |
680 | pr_err("Unsupported protect field %d\n", protect); | |
681 | return -EINVAL; | |
682 | } | |
683 | } | |
684 | ||
685 | return 0; | |
686 | } | |
687 | ||
f7b7c06f | 688 | static sense_reason_t |
499bf77b | 689 | sbc_check_prot(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb, |
19f9361a | 690 | u32 sectors, bool is_write) |
499bf77b | 691 | { |
19f9361a | 692 | u8 protect = cdb[1] >> 5; |
38b57f82 NB |
693 | int sp_ops = cmd->se_sess->sup_prot_ops; |
694 | int pi_prot_type = dev->dev_attrib.pi_prot_type; | |
695 | bool fabric_prot = false; | |
19f9361a | 696 | |
f7b7c06f | 697 | if (!cmd->t_prot_sg || !cmd->t_prot_nents) { |
38b57f82 NB |
698 | if (unlikely(protect && |
699 | !dev->dev_attrib.pi_prot_type && !cmd->se_sess->sess_prot_type)) { | |
700 | pr_err("CDB contains protect bit, but device + fabric does" | |
701 | " not advertise PROTECT=1 feature bit\n"); | |
f7b7c06f NB |
702 | return TCM_INVALID_CDB_FIELD; |
703 | } | |
704 | if (cmd->prot_pto) | |
705 | return TCM_NO_SENSE; | |
706 | } | |
499bf77b NB |
707 | |
708 | switch (dev->dev_attrib.pi_prot_type) { | |
709 | case TARGET_DIF_TYPE3_PROT: | |
499bf77b NB |
710 | cmd->reftag_seed = 0xffffffff; |
711 | break; | |
712 | case TARGET_DIF_TYPE2_PROT: | |
19f9361a | 713 | if (protect) |
f7b7c06f | 714 | return TCM_INVALID_CDB_FIELD; |
499bf77b NB |
715 | |
716 | cmd->reftag_seed = cmd->t_task_lba; | |
717 | break; | |
718 | case TARGET_DIF_TYPE1_PROT: | |
499bf77b NB |
719 | cmd->reftag_seed = cmd->t_task_lba; |
720 | break; | |
721 | case TARGET_DIF_TYPE0_PROT: | |
38b57f82 NB |
722 | /* |
723 | * See if the fabric supports T10-PI, and the session has been | |
724 | * configured to allow export PROTECT=1 feature bit with backend | |
725 | * devices that don't support T10-PI. | |
726 | */ | |
727 | fabric_prot = is_write ? | |
728 | !!(sp_ops & (TARGET_PROT_DOUT_PASS | TARGET_PROT_DOUT_STRIP)) : | |
729 | !!(sp_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DIN_INSERT)); | |
730 | ||
731 | if (fabric_prot && cmd->se_sess->sess_prot_type) { | |
732 | pi_prot_type = cmd->se_sess->sess_prot_type; | |
733 | break; | |
734 | } | |
cceca4a6 NB |
735 | if (!protect) |
736 | return TCM_NO_SENSE; | |
38b57f82 | 737 | /* Fallthrough */ |
499bf77b | 738 | default: |
cceca4a6 NB |
739 | pr_err("Unable to determine pi_prot_type for CDB: 0x%02x " |
740 | "PROTECT: 0x%02x\n", cdb[0], protect); | |
741 | return TCM_INVALID_CDB_FIELD; | |
499bf77b NB |
742 | } |
743 | ||
38b57f82 | 744 | if (sbc_set_prot_op_checks(protect, fabric_prot, pi_prot_type, is_write, cmd)) |
f7b7c06f | 745 | return TCM_INVALID_CDB_FIELD; |
19f9361a | 746 | |
38b57f82 | 747 | cmd->prot_type = pi_prot_type; |
499bf77b | 748 | cmd->prot_length = dev->prot_length * sectors; |
e2a4f55c SG |
749 | |
750 | /** | |
751 | * In case protection information exists over the wire | |
752 | * we modify command data length to describe pure data. | |
753 | * The actual transfer length is data length + protection | |
754 | * length | |
755 | **/ | |
756 | if (protect) | |
757 | cmd->data_length = sectors * dev->dev_attrib.block_size; | |
758 | ||
759 | pr_debug("%s: prot_type=%d, data_length=%d, prot_length=%d " | |
760 | "prot_op=%d prot_checks=%d\n", | |
761 | __func__, cmd->prot_type, cmd->data_length, cmd->prot_length, | |
03abad9e | 762 | cmd->prot_op, cmd->prot_checks); |
499bf77b | 763 | |
f7b7c06f | 764 | return TCM_NO_SENSE; |
499bf77b NB |
765 | } |
766 | ||
fde9f50f NB |
767 | static int |
768 | sbc_check_dpofua(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb) | |
769 | { | |
770 | if (cdb[1] & 0x10) { | |
814e5b45 CH |
771 | /* see explanation in spc_emulate_modesense */ |
772 | if (!target_check_fua(dev)) { | |
fde9f50f NB |
773 | pr_err("Got CDB: 0x%02x with DPO bit set, but device" |
774 | " does not advertise support for DPO\n", cdb[0]); | |
775 | return -EINVAL; | |
776 | } | |
777 | } | |
778 | if (cdb[1] & 0x8) { | |
814e5b45 | 779 | if (!target_check_fua(dev)) { |
fde9f50f NB |
780 | pr_err("Got CDB: 0x%02x with FUA bit set, but device" |
781 | " does not advertise support for FUA write\n", | |
782 | cdb[0]); | |
783 | return -EINVAL; | |
784 | } | |
785 | cmd->se_cmd_flags |= SCF_FUA; | |
786 | } | |
787 | return 0; | |
499bf77b NB |
788 | } |
789 | ||
de103c93 CH |
790 | sense_reason_t |
791 | sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops) | |
d6e0175c | 792 | { |
d6e0175c CH |
793 | struct se_device *dev = cmd->se_dev; |
794 | unsigned char *cdb = cmd->t_task_cdb; | |
1fd032ee | 795 | unsigned int size; |
d6e0175c | 796 | u32 sectors = 0; |
de103c93 | 797 | sense_reason_t ret; |
d6e0175c | 798 | |
7a971b1b CH |
799 | cmd->protocol_data = ops; |
800 | ||
d6e0175c CH |
801 | switch (cdb[0]) { |
802 | case READ_6: | |
803 | sectors = transport_get_sectors_6(cdb); | |
804 | cmd->t_task_lba = transport_lba_21(cdb); | |
805 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
a82a9538 | 806 | cmd->execute_cmd = sbc_execute_rw; |
d6e0175c CH |
807 | break; |
808 | case READ_10: | |
809 | sectors = transport_get_sectors_10(cdb); | |
810 | cmd->t_task_lba = transport_lba_32(cdb); | |
499bf77b | 811 | |
fde9f50f NB |
812 | if (sbc_check_dpofua(dev, cmd, cdb)) |
813 | return TCM_INVALID_CDB_FIELD; | |
814 | ||
f7b7c06f NB |
815 | ret = sbc_check_prot(dev, cmd, cdb, sectors, false); |
816 | if (ret) | |
817 | return ret; | |
499bf77b | 818 | |
d6e0175c | 819 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
a82a9538 | 820 | cmd->execute_cmd = sbc_execute_rw; |
d6e0175c CH |
821 | break; |
822 | case READ_12: | |
823 | sectors = transport_get_sectors_12(cdb); | |
824 | cmd->t_task_lba = transport_lba_32(cdb); | |
499bf77b | 825 | |
fde9f50f NB |
826 | if (sbc_check_dpofua(dev, cmd, cdb)) |
827 | return TCM_INVALID_CDB_FIELD; | |
828 | ||
f7b7c06f NB |
829 | ret = sbc_check_prot(dev, cmd, cdb, sectors, false); |
830 | if (ret) | |
831 | return ret; | |
499bf77b | 832 | |
d6e0175c | 833 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
a82a9538 | 834 | cmd->execute_cmd = sbc_execute_rw; |
d6e0175c CH |
835 | break; |
836 | case READ_16: | |
837 | sectors = transport_get_sectors_16(cdb); | |
838 | cmd->t_task_lba = transport_lba_64(cdb); | |
499bf77b | 839 | |
fde9f50f NB |
840 | if (sbc_check_dpofua(dev, cmd, cdb)) |
841 | return TCM_INVALID_CDB_FIELD; | |
842 | ||
f7b7c06f NB |
843 | ret = sbc_check_prot(dev, cmd, cdb, sectors, false); |
844 | if (ret) | |
845 | return ret; | |
499bf77b | 846 | |
d6e0175c | 847 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
a82a9538 | 848 | cmd->execute_cmd = sbc_execute_rw; |
d6e0175c CH |
849 | break; |
850 | case WRITE_6: | |
851 | sectors = transport_get_sectors_6(cdb); | |
852 | cmd->t_task_lba = transport_lba_21(cdb); | |
853 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
a82a9538 | 854 | cmd->execute_cmd = sbc_execute_rw; |
d6e0175c CH |
855 | break; |
856 | case WRITE_10: | |
984a9d4c | 857 | case WRITE_VERIFY: |
d6e0175c CH |
858 | sectors = transport_get_sectors_10(cdb); |
859 | cmd->t_task_lba = transport_lba_32(cdb); | |
499bf77b | 860 | |
fde9f50f NB |
861 | if (sbc_check_dpofua(dev, cmd, cdb)) |
862 | return TCM_INVALID_CDB_FIELD; | |
863 | ||
f7b7c06f NB |
864 | ret = sbc_check_prot(dev, cmd, cdb, sectors, true); |
865 | if (ret) | |
866 | return ret; | |
499bf77b | 867 | |
d6e0175c | 868 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
a82a9538 | 869 | cmd->execute_cmd = sbc_execute_rw; |
d6e0175c CH |
870 | break; |
871 | case WRITE_12: | |
872 | sectors = transport_get_sectors_12(cdb); | |
873 | cmd->t_task_lba = transport_lba_32(cdb); | |
499bf77b | 874 | |
fde9f50f NB |
875 | if (sbc_check_dpofua(dev, cmd, cdb)) |
876 | return TCM_INVALID_CDB_FIELD; | |
877 | ||
f7b7c06f NB |
878 | ret = sbc_check_prot(dev, cmd, cdb, sectors, true); |
879 | if (ret) | |
880 | return ret; | |
499bf77b | 881 | |
d6e0175c | 882 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
a82a9538 | 883 | cmd->execute_cmd = sbc_execute_rw; |
d6e0175c CH |
884 | break; |
885 | case WRITE_16: | |
984a9d4c | 886 | case WRITE_VERIFY_16: |
d6e0175c CH |
887 | sectors = transport_get_sectors_16(cdb); |
888 | cmd->t_task_lba = transport_lba_64(cdb); | |
499bf77b | 889 | |
fde9f50f NB |
890 | if (sbc_check_dpofua(dev, cmd, cdb)) |
891 | return TCM_INVALID_CDB_FIELD; | |
892 | ||
f7b7c06f NB |
893 | ret = sbc_check_prot(dev, cmd, cdb, sectors, true); |
894 | if (ret) | |
895 | return ret; | |
499bf77b | 896 | |
d6e0175c | 897 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
a82a9538 | 898 | cmd->execute_cmd = sbc_execute_rw; |
d6e0175c CH |
899 | break; |
900 | case XDWRITEREAD_10: | |
de103c93 | 901 | if (cmd->data_direction != DMA_TO_DEVICE || |
d6e0175c | 902 | !(cmd->se_cmd_flags & SCF_BIDI)) |
de103c93 | 903 | return TCM_INVALID_CDB_FIELD; |
d6e0175c CH |
904 | sectors = transport_get_sectors_10(cdb); |
905 | ||
fde9f50f NB |
906 | if (sbc_check_dpofua(dev, cmd, cdb)) |
907 | return TCM_INVALID_CDB_FIELD; | |
908 | ||
d6e0175c CH |
909 | cmd->t_task_lba = transport_lba_32(cdb); |
910 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
911 | ||
912 | /* | |
913 | * Setup BIDI XOR callback to be run after I/O completion. | |
914 | */ | |
a82a9538 | 915 | cmd->execute_cmd = sbc_execute_rw; |
d6e0175c | 916 | cmd->transport_complete_callback = &xdreadwrite_callback; |
d6e0175c CH |
917 | break; |
918 | case VARIABLE_LENGTH_CMD: | |
919 | { | |
920 | u16 service_action = get_unaligned_be16(&cdb[8]); | |
921 | switch (service_action) { | |
922 | case XDWRITEREAD_32: | |
923 | sectors = transport_get_sectors_32(cdb); | |
924 | ||
fde9f50f NB |
925 | if (sbc_check_dpofua(dev, cmd, cdb)) |
926 | return TCM_INVALID_CDB_FIELD; | |
d6e0175c CH |
927 | /* |
928 | * Use WRITE_32 and READ_32 opcodes for the emulated | |
929 | * XDWRITE_READ_32 logic. | |
930 | */ | |
931 | cmd->t_task_lba = transport_lba_64_ext(cdb); | |
932 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
933 | ||
934 | /* | |
935 | * Setup BIDI XOR callback to be run during after I/O | |
936 | * completion. | |
937 | */ | |
a82a9538 | 938 | cmd->execute_cmd = sbc_execute_rw; |
d6e0175c | 939 | cmd->transport_complete_callback = &xdreadwrite_callback; |
d6e0175c CH |
940 | break; |
941 | case WRITE_SAME_32: | |
942 | sectors = transport_get_sectors_32(cdb); | |
943 | if (!sectors) { | |
944 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not" | |
945 | " supported\n"); | |
de103c93 | 946 | return TCM_INVALID_CDB_FIELD; |
d6e0175c CH |
947 | } |
948 | ||
1fd032ee | 949 | size = sbc_get_size(cmd, 1); |
d6e0175c CH |
950 | cmd->t_task_lba = get_unaligned_be64(&cdb[12]); |
951 | ||
cd063bef | 952 | ret = sbc_setup_write_same(cmd, &cdb[10], ops); |
6b64e1fe | 953 | if (ret) |
cd063bef | 954 | return ret; |
d6e0175c CH |
955 | break; |
956 | default: | |
957 | pr_err("VARIABLE_LENGTH_CMD service action" | |
958 | " 0x%04x not supported\n", service_action); | |
de103c93 | 959 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
d6e0175c CH |
960 | } |
961 | break; | |
962 | } | |
68ff9b9b | 963 | case COMPARE_AND_WRITE: |
12f66e4a | 964 | if (!dev->dev_attrib.emulate_caw) { |
6f3bf5a2 BVA |
965 | pr_err_ratelimited("se_device %s/%s (vpd_unit_serial %s) reject COMPARE_AND_WRITE\n", |
966 | dev->se_hba->backend->ops->name, | |
967 | config_item_name(&dev->dev_group.cg_item), | |
968 | dev->t10_wwn.unit_serial); | |
12f66e4a JY |
969 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
970 | } | |
68ff9b9b NB |
971 | sectors = cdb[13]; |
972 | /* | |
973 | * Currently enforce COMPARE_AND_WRITE for a single sector | |
974 | */ | |
975 | if (sectors > 1) { | |
976 | pr_err("COMPARE_AND_WRITE contains NoLB: %u greater" | |
977 | " than 1\n", sectors); | |
978 | return TCM_INVALID_CDB_FIELD; | |
979 | } | |
ab81a5e0 DD |
980 | if (sbc_check_dpofua(dev, cmd, cdb)) |
981 | return TCM_INVALID_CDB_FIELD; | |
982 | ||
68ff9b9b NB |
983 | /* |
984 | * Double size because we have two buffers, note that | |
985 | * zero is not an error.. | |
986 | */ | |
987 | size = 2 * sbc_get_size(cmd, sectors); | |
988 | cmd->t_task_lba = get_unaligned_be64(&cdb[2]); | |
989 | cmd->t_task_nolb = sectors; | |
990 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB | SCF_COMPARE_AND_WRITE; | |
68ff9b9b NB |
991 | cmd->execute_cmd = sbc_compare_and_write; |
992 | cmd->transport_complete_callback = compare_and_write_callback; | |
993 | break; | |
d6e0175c | 994 | case READ_CAPACITY: |
1fd032ee CH |
995 | size = READ_CAP_LEN; |
996 | cmd->execute_cmd = sbc_emulate_readcapacity; | |
d6e0175c | 997 | break; |
eb846d9f | 998 | case SERVICE_ACTION_IN_16: |
d6e0175c CH |
999 | switch (cmd->t_task_cdb[1] & 0x1f) { |
1000 | case SAI_READ_CAPACITY_16: | |
1fd032ee | 1001 | cmd->execute_cmd = sbc_emulate_readcapacity_16; |
d6e0175c | 1002 | break; |
c66094bf HR |
1003 | case SAI_REPORT_REFERRALS: |
1004 | cmd->execute_cmd = target_emulate_report_referrals; | |
1005 | break; | |
d6e0175c CH |
1006 | default: |
1007 | pr_err("Unsupported SA: 0x%02x\n", | |
1008 | cmd->t_task_cdb[1] & 0x1f); | |
de103c93 | 1009 | return TCM_INVALID_CDB_FIELD; |
d6e0175c | 1010 | } |
a85d667e | 1011 | size = get_unaligned_be32(&cdb[10]); |
d6e0175c CH |
1012 | break; |
1013 | case SYNCHRONIZE_CACHE: | |
1014 | case SYNCHRONIZE_CACHE_16: | |
d6e0175c CH |
1015 | if (cdb[0] == SYNCHRONIZE_CACHE) { |
1016 | sectors = transport_get_sectors_10(cdb); | |
1017 | cmd->t_task_lba = transport_lba_32(cdb); | |
1018 | } else { | |
1019 | sectors = transport_get_sectors_16(cdb); | |
1020 | cmd->t_task_lba = transport_lba_64(cdb); | |
1021 | } | |
6ef31dc7 CVB |
1022 | if (ops->execute_sync_cache) { |
1023 | cmd->execute_cmd = ops->execute_sync_cache; | |
1024 | goto check_lba; | |
d6e0175c | 1025 | } |
6ef31dc7 CVB |
1026 | size = 0; |
1027 | cmd->execute_cmd = sbc_emulate_noop; | |
d6e0175c CH |
1028 | break; |
1029 | case UNMAP: | |
14150a6b | 1030 | if (!ops->execute_unmap) |
de103c93 | 1031 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
14150a6b | 1032 | |
61fdb4ac NB |
1033 | if (!dev->dev_attrib.emulate_tpu) { |
1034 | pr_err("Got UNMAP, but backend device has" | |
1035 | " emulate_tpu disabled\n"); | |
1036 | return TCM_UNSUPPORTED_SCSI_OPCODE; | |
1037 | } | |
1fd032ee | 1038 | size = get_unaligned_be16(&cdb[7]); |
62e46942 | 1039 | cmd->execute_cmd = sbc_execute_unmap; |
d6e0175c CH |
1040 | break; |
1041 | case WRITE_SAME_16: | |
1042 | sectors = transport_get_sectors_16(cdb); | |
1043 | if (!sectors) { | |
1044 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); | |
de103c93 | 1045 | return TCM_INVALID_CDB_FIELD; |
d6e0175c CH |
1046 | } |
1047 | ||
1fd032ee | 1048 | size = sbc_get_size(cmd, 1); |
d6e0175c CH |
1049 | cmd->t_task_lba = get_unaligned_be64(&cdb[2]); |
1050 | ||
cd063bef | 1051 | ret = sbc_setup_write_same(cmd, &cdb[1], ops); |
6b64e1fe | 1052 | if (ret) |
cd063bef | 1053 | return ret; |
d6e0175c CH |
1054 | break; |
1055 | case WRITE_SAME: | |
1056 | sectors = transport_get_sectors_10(cdb); | |
1057 | if (!sectors) { | |
1058 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); | |
de103c93 | 1059 | return TCM_INVALID_CDB_FIELD; |
d6e0175c CH |
1060 | } |
1061 | ||
1fd032ee | 1062 | size = sbc_get_size(cmd, 1); |
d6e0175c CH |
1063 | cmd->t_task_lba = get_unaligned_be32(&cdb[2]); |
1064 | ||
1065 | /* | |
1066 | * Follow sbcr26 with WRITE_SAME (10) and check for the existence | |
1067 | * of byte 1 bit 3 UNMAP instead of original reserved field | |
1068 | */ | |
cd063bef | 1069 | ret = sbc_setup_write_same(cmd, &cdb[1], ops); |
6b64e1fe | 1070 | if (ret) |
cd063bef | 1071 | return ret; |
d6e0175c CH |
1072 | break; |
1073 | case VERIFY: | |
13603685 | 1074 | case VERIFY_16: |
984a9d4c NB |
1075 | size = 0; |
1076 | if (cdb[0] == VERIFY) { | |
1077 | sectors = transport_get_sectors_10(cdb); | |
1078 | cmd->t_task_lba = transport_lba_32(cdb); | |
1079 | } else { | |
1080 | sectors = transport_get_sectors_16(cdb); | |
1081 | cmd->t_task_lba = transport_lba_64(cdb); | |
1082 | } | |
1920ed61 | 1083 | cmd->execute_cmd = sbc_emulate_noop; |
c52716de | 1084 | goto check_lba; |
1a1ff38c BK |
1085 | case REZERO_UNIT: |
1086 | case SEEK_6: | |
1087 | case SEEK_10: | |
1088 | /* | |
1089 | * There are still clients out there which use these old SCSI-2 | |
1090 | * commands. This mainly happens when running VMs with legacy | |
1091 | * guest systems, connected via SCSI command pass-through to | |
1092 | * iSCSI targets. Make them happy and return status GOOD. | |
1093 | */ | |
1094 | size = 0; | |
1095 | cmd->execute_cmd = sbc_emulate_noop; | |
1096 | break; | |
45182ed5 BB |
1097 | case START_STOP: |
1098 | size = 0; | |
1099 | cmd->execute_cmd = sbc_emulate_startstop; | |
1100 | break; | |
d6e0175c | 1101 | default: |
1fd032ee | 1102 | ret = spc_parse_cdb(cmd, &size); |
d6e0175c CH |
1103 | if (ret) |
1104 | return ret; | |
1105 | } | |
1106 | ||
1107 | /* reject any command that we don't have a handler for */ | |
20959c4b | 1108 | if (!cmd->execute_cmd) |
de103c93 | 1109 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
d6e0175c CH |
1110 | |
1111 | if (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) { | |
1fd032ee | 1112 | unsigned long long end_lba; |
6ef31dc7 | 1113 | check_lba: |
1fd032ee | 1114 | end_lba = dev->transport->get_blocks(dev) + 1; |
aa179935 NB |
1115 | if (((cmd->t_task_lba + sectors) < cmd->t_task_lba) || |
1116 | ((cmd->t_task_lba + sectors) > end_lba)) { | |
1fd032ee CH |
1117 | pr_err("cmd exceeds last lba %llu " |
1118 | "(lba %llu, sectors %u)\n", | |
1119 | end_lba, cmd->t_task_lba, sectors); | |
09ceadc7 | 1120 | return TCM_ADDRESS_OUT_OF_RANGE; |
1fd032ee CH |
1121 | } |
1122 | ||
68ff9b9b NB |
1123 | if (!(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) |
1124 | size = sbc_get_size(cmd, sectors); | |
d6e0175c CH |
1125 | } |
1126 | ||
de103c93 | 1127 | return target_cmd_size_check(cmd, size); |
d6e0175c CH |
1128 | } |
1129 | EXPORT_SYMBOL(sbc_parse_cdb); | |
6f23ac8a | 1130 | |
6f23ac8a CH |
1131 | u32 sbc_get_device_type(struct se_device *dev) |
1132 | { | |
1133 | return TYPE_DISK; | |
1134 | } | |
1135 | EXPORT_SYMBOL(sbc_get_device_type); | |
86d71829 | 1136 | |
62e46942 CH |
1137 | static sense_reason_t |
1138 | sbc_execute_unmap(struct se_cmd *cmd) | |
86d71829 | 1139 | { |
62e46942 | 1140 | struct sbc_ops *ops = cmd->protocol_data; |
86d71829 AH |
1141 | struct se_device *dev = cmd->se_dev; |
1142 | unsigned char *buf, *ptr = NULL; | |
1143 | sector_t lba; | |
1144 | int size; | |
1145 | u32 range; | |
1146 | sense_reason_t ret = 0; | |
1147 | int dl, bd_dl; | |
1148 | ||
1149 | /* We never set ANC_SUP */ | |
1150 | if (cmd->t_task_cdb[1]) | |
1151 | return TCM_INVALID_CDB_FIELD; | |
1152 | ||
1153 | if (cmd->data_length == 0) { | |
1154 | target_complete_cmd(cmd, SAM_STAT_GOOD); | |
1155 | return 0; | |
1156 | } | |
1157 | ||
1158 | if (cmd->data_length < 8) { | |
1159 | pr_warn("UNMAP parameter list length %u too small\n", | |
1160 | cmd->data_length); | |
1161 | return TCM_PARAMETER_LIST_LENGTH_ERROR; | |
1162 | } | |
1163 | ||
1164 | buf = transport_kmap_data_sg(cmd); | |
1165 | if (!buf) | |
1166 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
1167 | ||
1168 | dl = get_unaligned_be16(&buf[0]); | |
1169 | bd_dl = get_unaligned_be16(&buf[2]); | |
1170 | ||
1171 | size = cmd->data_length - 8; | |
1172 | if (bd_dl > size) | |
1173 | pr_warn("UNMAP parameter list length %u too small, ignoring bd_dl %u\n", | |
1174 | cmd->data_length, bd_dl); | |
1175 | else | |
1176 | size = bd_dl; | |
1177 | ||
1178 | if (size / 16 > dev->dev_attrib.max_unmap_block_desc_count) { | |
1179 | ret = TCM_INVALID_PARAMETER_LIST; | |
1180 | goto err; | |
1181 | } | |
1182 | ||
1183 | /* First UNMAP block descriptor starts at 8 byte offset */ | |
1184 | ptr = &buf[8]; | |
1185 | pr_debug("UNMAP: Sub: %s Using dl: %u bd_dl: %u size: %u" | |
1186 | " ptr: %p\n", dev->transport->name, dl, bd_dl, size, ptr); | |
1187 | ||
1188 | while (size >= 16) { | |
1189 | lba = get_unaligned_be64(&ptr[0]); | |
1190 | range = get_unaligned_be32(&ptr[8]); | |
1191 | pr_debug("UNMAP: Using lba: %llu and range: %u\n", | |
1192 | (unsigned long long)lba, range); | |
1193 | ||
1194 | if (range > dev->dev_attrib.max_unmap_lba_count) { | |
1195 | ret = TCM_INVALID_PARAMETER_LIST; | |
1196 | goto err; | |
1197 | } | |
1198 | ||
1199 | if (lba + range > dev->transport->get_blocks(dev) + 1) { | |
1200 | ret = TCM_ADDRESS_OUT_OF_RANGE; | |
1201 | goto err; | |
1202 | } | |
1203 | ||
9960f851 AV |
1204 | if (range) { |
1205 | ret = ops->execute_unmap(cmd, lba, range); | |
1206 | if (ret) | |
1207 | goto err; | |
1208 | } | |
86d71829 AH |
1209 | |
1210 | ptr += 16; | |
1211 | size -= 16; | |
1212 | } | |
1213 | ||
1214 | err: | |
1215 | transport_kunmap_data_sg(cmd); | |
1216 | if (!ret) | |
1217 | target_complete_cmd(cmd, GOOD); | |
1218 | return ret; | |
1219 | } | |
41861fa8 | 1220 | |
66a3d5bc NB |
1221 | void |
1222 | sbc_dif_generate(struct se_cmd *cmd) | |
1223 | { | |
1224 | struct se_device *dev = cmd->se_dev; | |
fe052a18 | 1225 | struct t10_pi_tuple *sdt; |
18213afb | 1226 | struct scatterlist *dsg = cmd->t_data_sg, *psg; |
66a3d5bc NB |
1227 | sector_t sector = cmd->t_task_lba; |
1228 | void *daddr, *paddr; | |
1229 | int i, j, offset = 0; | |
18213afb | 1230 | unsigned int block_size = dev->dev_attrib.block_size; |
66a3d5bc | 1231 | |
18213afb | 1232 | for_each_sg(cmd->t_prot_sg, psg, cmd->t_prot_nents, i) { |
66a3d5bc | 1233 | paddr = kmap_atomic(sg_page(psg)) + psg->offset; |
18213afb | 1234 | daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; |
66a3d5bc | 1235 | |
18213afb | 1236 | for (j = 0; j < psg->length; |
fe052a18 | 1237 | j += sizeof(*sdt)) { |
18213afb AM |
1238 | __u16 crc; |
1239 | unsigned int avail; | |
66a3d5bc | 1240 | |
18213afb AM |
1241 | if (offset >= dsg->length) { |
1242 | offset -= dsg->length; | |
1243 | kunmap_atomic(daddr - dsg->offset); | |
1244 | dsg = sg_next(dsg); | |
1245 | if (!dsg) { | |
1246 | kunmap_atomic(paddr - psg->offset); | |
1247 | return; | |
1248 | } | |
1249 | daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; | |
66a3d5bc | 1250 | } |
66a3d5bc | 1251 | |
18213afb AM |
1252 | sdt = paddr + j; |
1253 | avail = min(block_size, dsg->length - offset); | |
1254 | crc = crc_t10dif(daddr + offset, avail); | |
1255 | if (avail < block_size) { | |
1256 | kunmap_atomic(daddr - dsg->offset); | |
1257 | dsg = sg_next(dsg); | |
1258 | if (!dsg) { | |
1259 | kunmap_atomic(paddr - psg->offset); | |
1260 | return; | |
1261 | } | |
1262 | daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; | |
1263 | offset = block_size - avail; | |
1264 | crc = crc_t10dif_update(crc, daddr, offset); | |
1265 | } else { | |
1266 | offset += block_size; | |
66a3d5bc NB |
1267 | } |
1268 | ||
18213afb | 1269 | sdt->guard_tag = cpu_to_be16(crc); |
823ddd87 | 1270 | if (cmd->prot_type == TARGET_DIF_TYPE1_PROT) |
66a3d5bc NB |
1271 | sdt->ref_tag = cpu_to_be32(sector & 0xffffffff); |
1272 | sdt->app_tag = 0; | |
1273 | ||
6ae50408 | 1274 | pr_debug("DIF %s INSERT sector: %llu guard_tag: 0x%04x" |
66a3d5bc | 1275 | " app_tag: 0x%04x ref_tag: %u\n", |
6ae50408 NB |
1276 | (cmd->data_direction == DMA_TO_DEVICE) ? |
1277 | "WRITE" : "READ", (unsigned long long)sector, | |
1278 | sdt->guard_tag, sdt->app_tag, | |
1279 | be32_to_cpu(sdt->ref_tag)); | |
66a3d5bc NB |
1280 | |
1281 | sector++; | |
66a3d5bc NB |
1282 | } |
1283 | ||
18213afb AM |
1284 | kunmap_atomic(daddr - dsg->offset); |
1285 | kunmap_atomic(paddr - psg->offset); | |
66a3d5bc NB |
1286 | } |
1287 | } | |
1288 | ||
41861fa8 | 1289 | static sense_reason_t |
fe052a18 | 1290 | sbc_dif_v1_verify(struct se_cmd *cmd, struct t10_pi_tuple *sdt, |
18213afb | 1291 | __u16 crc, sector_t sector, unsigned int ei_lba) |
41861fa8 | 1292 | { |
41861fa8 NB |
1293 | __be16 csum; |
1294 | ||
d7a463b0 NB |
1295 | if (!(cmd->prot_checks & TARGET_DIF_CHECK_GUARD)) |
1296 | goto check_ref; | |
1297 | ||
18213afb | 1298 | csum = cpu_to_be16(crc); |
41861fa8 NB |
1299 | |
1300 | if (sdt->guard_tag != csum) { | |
1301 | pr_err("DIFv1 checksum failed on sector %llu guard tag 0x%04x" | |
1302 | " csum 0x%04x\n", (unsigned long long)sector, | |
1303 | be16_to_cpu(sdt->guard_tag), be16_to_cpu(csum)); | |
1304 | return TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED; | |
1305 | } | |
1306 | ||
d7a463b0 NB |
1307 | check_ref: |
1308 | if (!(cmd->prot_checks & TARGET_DIF_CHECK_REFTAG)) | |
1309 | return 0; | |
1310 | ||
823ddd87 | 1311 | if (cmd->prot_type == TARGET_DIF_TYPE1_PROT && |
41861fa8 NB |
1312 | be32_to_cpu(sdt->ref_tag) != (sector & 0xffffffff)) { |
1313 | pr_err("DIFv1 Type 1 reference failed on sector: %llu tag: 0x%08x" | |
1314 | " sector MSB: 0x%08x\n", (unsigned long long)sector, | |
1315 | be32_to_cpu(sdt->ref_tag), (u32)(sector & 0xffffffff)); | |
1316 | return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED; | |
1317 | } | |
1318 | ||
823ddd87 | 1319 | if (cmd->prot_type == TARGET_DIF_TYPE2_PROT && |
41861fa8 NB |
1320 | be32_to_cpu(sdt->ref_tag) != ei_lba) { |
1321 | pr_err("DIFv1 Type 2 reference failed on sector: %llu tag: 0x%08x" | |
1322 | " ei_lba: 0x%08x\n", (unsigned long long)sector, | |
1323 | be32_to_cpu(sdt->ref_tag), ei_lba); | |
1324 | return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED; | |
1325 | } | |
1326 | ||
1327 | return 0; | |
1328 | } | |
1329 | ||
f75b6fae SG |
1330 | void sbc_dif_copy_prot(struct se_cmd *cmd, unsigned int sectors, bool read, |
1331 | struct scatterlist *sg, int sg_off) | |
41861fa8 NB |
1332 | { |
1333 | struct se_device *dev = cmd->se_dev; | |
1334 | struct scatterlist *psg; | |
1335 | void *paddr, *addr; | |
1336 | unsigned int i, len, left; | |
10762e80 | 1337 | unsigned int offset = sg_off; |
41861fa8 | 1338 | |
38b57f82 NB |
1339 | if (!sg) |
1340 | return; | |
1341 | ||
41861fa8 NB |
1342 | left = sectors * dev->prot_length; |
1343 | ||
1344 | for_each_sg(cmd->t_prot_sg, psg, cmd->t_prot_nents, i) { | |
16c0ae02 | 1345 | unsigned int psg_len, copied = 0; |
d6a65fdc | 1346 | |
41861fa8 | 1347 | paddr = kmap_atomic(sg_page(psg)) + psg->offset; |
16c0ae02 SG |
1348 | psg_len = min(left, psg->length); |
1349 | while (psg_len) { | |
1350 | len = min(psg_len, sg->length - offset); | |
1351 | addr = kmap_atomic(sg_page(sg)) + sg->offset + offset; | |
1352 | ||
1353 | if (read) | |
1354 | memcpy(paddr + copied, addr, len); | |
1355 | else | |
1356 | memcpy(addr, paddr + copied, len); | |
1357 | ||
1358 | left -= len; | |
1359 | offset += len; | |
1360 | copied += len; | |
1361 | psg_len -= len; | |
1362 | ||
57636388 AM |
1363 | kunmap_atomic(addr - sg->offset - offset); |
1364 | ||
16c0ae02 SG |
1365 | if (offset >= sg->length) { |
1366 | sg = sg_next(sg); | |
1367 | offset = 0; | |
1368 | } | |
16c0ae02 | 1369 | } |
57636388 | 1370 | kunmap_atomic(paddr - psg->offset); |
41861fa8 NB |
1371 | } |
1372 | } | |
f75b6fae | 1373 | EXPORT_SYMBOL(sbc_dif_copy_prot); |
41861fa8 NB |
1374 | |
1375 | sense_reason_t | |
f75b6fae | 1376 | sbc_dif_verify(struct se_cmd *cmd, sector_t start, unsigned int sectors, |
414e4627 | 1377 | unsigned int ei_lba, struct scatterlist *psg, int psg_off) |
41861fa8 NB |
1378 | { |
1379 | struct se_device *dev = cmd->se_dev; | |
fe052a18 | 1380 | struct t10_pi_tuple *sdt; |
18213afb | 1381 | struct scatterlist *dsg = cmd->t_data_sg; |
41861fa8 NB |
1382 | sector_t sector = start; |
1383 | void *daddr, *paddr; | |
18213afb | 1384 | int i; |
41861fa8 | 1385 | sense_reason_t rc; |
18213afb AM |
1386 | int dsg_off = 0; |
1387 | unsigned int block_size = dev->dev_attrib.block_size; | |
41861fa8 | 1388 | |
18213afb | 1389 | for (; psg && sector < start + sectors; psg = sg_next(psg)) { |
41861fa8 | 1390 | paddr = kmap_atomic(sg_page(psg)) + psg->offset; |
41861fa8 | 1391 | daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; |
41861fa8 | 1392 | |
18213afb AM |
1393 | for (i = psg_off; i < psg->length && |
1394 | sector < start + sectors; | |
fe052a18 | 1395 | i += sizeof(*sdt)) { |
18213afb AM |
1396 | __u16 crc; |
1397 | unsigned int avail; | |
41861fa8 | 1398 | |
18213afb AM |
1399 | if (dsg_off >= dsg->length) { |
1400 | dsg_off -= dsg->length; | |
1401 | kunmap_atomic(daddr - dsg->offset); | |
1402 | dsg = sg_next(dsg); | |
1403 | if (!dsg) { | |
1404 | kunmap_atomic(paddr - psg->offset); | |
1405 | return 0; | |
1406 | } | |
1407 | daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; | |
41861fa8 NB |
1408 | } |
1409 | ||
18213afb | 1410 | sdt = paddr + i; |
41861fa8 NB |
1411 | |
1412 | pr_debug("DIF READ sector: %llu guard_tag: 0x%04x" | |
1413 | " app_tag: 0x%04x ref_tag: %u\n", | |
1414 | (unsigned long long)sector, sdt->guard_tag, | |
1415 | sdt->app_tag, be32_to_cpu(sdt->ref_tag)); | |
1416 | ||
128b6f9f | 1417 | if (sdt->app_tag == T10_PI_APP_ESCAPE) { |
18213afb AM |
1418 | dsg_off += block_size; |
1419 | goto next; | |
1420 | } | |
1421 | ||
1422 | avail = min(block_size, dsg->length - dsg_off); | |
1423 | crc = crc_t10dif(daddr + dsg_off, avail); | |
1424 | if (avail < block_size) { | |
1425 | kunmap_atomic(daddr - dsg->offset); | |
1426 | dsg = sg_next(dsg); | |
1427 | if (!dsg) { | |
1428 | kunmap_atomic(paddr - psg->offset); | |
1429 | return 0; | |
1430 | } | |
1431 | daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; | |
1432 | dsg_off = block_size - avail; | |
1433 | crc = crc_t10dif_update(crc, daddr, dsg_off); | |
1434 | } else { | |
1435 | dsg_off += block_size; | |
41861fa8 NB |
1436 | } |
1437 | ||
18213afb | 1438 | rc = sbc_dif_v1_verify(cmd, sdt, crc, sector, ei_lba); |
41861fa8 | 1439 | if (rc) { |
414e4627 | 1440 | kunmap_atomic(daddr - dsg->offset); |
18213afb | 1441 | kunmap_atomic(paddr - psg->offset); |
76736db3 | 1442 | cmd->bad_sector = sector; |
41861fa8 NB |
1443 | return rc; |
1444 | } | |
18213afb | 1445 | next: |
41861fa8 NB |
1446 | sector++; |
1447 | ei_lba++; | |
41861fa8 NB |
1448 | } |
1449 | ||
18213afb | 1450 | psg_off = 0; |
414e4627 | 1451 | kunmap_atomic(daddr - dsg->offset); |
18213afb | 1452 | kunmap_atomic(paddr - psg->offset); |
41861fa8 | 1453 | } |
41861fa8 NB |
1454 | |
1455 | return 0; | |
1456 | } | |
f75b6fae | 1457 | EXPORT_SYMBOL(sbc_dif_verify); |