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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 | 27 | static sense_reason_t |
6d8e7e7c | 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 | |
14b40c1e | 70 | target_complete_cmd_with_length(cmd, SAM_STAT_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 | |
14b40c1e | 133 | target_complete_cmd_with_length(cmd, SAM_STAT_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 | ||
14b40c1e | 205 | target_complete_cmd(cmd, SAM_STAT_GOOD); |
b753d643 CH |
206 | return 0; |
207 | } | |
208 | ||
de103c93 | 209 | static sense_reason_t |
1920ed61 | 210 | sbc_emulate_noop(struct se_cmd *cmd) |
1a1ff38c | 211 | { |
14b40c1e | 212 | target_complete_cmd(cmd, SAM_STAT_GOOD); |
1a1ff38c BK |
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 | 281 | static sense_reason_t |
6d8e7e7c | 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 | |
6d8e7e7c | 289 | if ((flags & 0x04) || (flags & 0x02)) { |
d6e0175c CH |
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 | 310 | /* We always have ANC_SUP == 0 so setting ANCHOR is always an error */ |
6d8e7e7c | 311 | if (flags & 0x10) { |
5cb770bf RD |
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 | */ |
6d8e7e7c | 319 | if (flags & 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 | |
6d8e7e7c | 334 | ret = sbc_check_prot(dev, cmd, flags >> 5, sectors, true); |
afd73f1b NB |
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 | ||
ab628b9f | 437 | /* |
749c226c DD |
438 | * compare @cmp_len bytes of @read_sgl with @cmp_sgl. On miscompare, fill |
439 | * @miscmp_off and return TCM_MISCOMPARE_VERIFY. | |
ab628b9f DD |
440 | */ |
441 | static sense_reason_t | |
442 | compare_and_write_do_cmp(struct scatterlist *read_sgl, unsigned int read_nents, | |
443 | struct scatterlist *cmp_sgl, unsigned int cmp_nents, | |
749c226c | 444 | unsigned int cmp_len, unsigned int *miscmp_off) |
ab628b9f DD |
445 | { |
446 | unsigned char *buf = NULL; | |
447 | struct scatterlist *sg; | |
448 | sense_reason_t ret; | |
449 | unsigned int offset; | |
450 | size_t rc; | |
5cfb5b02 | 451 | int sg_cnt; |
ab628b9f DD |
452 | |
453 | buf = kzalloc(cmp_len, GFP_KERNEL); | |
454 | if (!buf) { | |
455 | ret = TCM_OUT_OF_RESOURCES; | |
456 | goto out; | |
457 | } | |
458 | ||
459 | rc = sg_copy_to_buffer(cmp_sgl, cmp_nents, buf, cmp_len); | |
460 | if (!rc) { | |
461 | pr_err("sg_copy_to_buffer() failed for compare_and_write\n"); | |
462 | ret = TCM_OUT_OF_RESOURCES; | |
463 | goto out; | |
464 | } | |
465 | /* | |
466 | * Compare SCSI READ payload against verify payload | |
467 | */ | |
468 | offset = 0; | |
749c226c | 469 | ret = TCM_NO_SENSE; |
5cfb5b02 | 470 | for_each_sg(read_sgl, sg, read_nents, sg_cnt) { |
ab628b9f DD |
471 | unsigned int len = min(sg->length, cmp_len); |
472 | unsigned char *addr = kmap_atomic(sg_page(sg)); | |
473 | ||
474 | if (memcmp(addr, buf + offset, len)) { | |
749c226c DD |
475 | unsigned int i; |
476 | ||
477 | for (i = 0; i < len && addr[i] == buf[offset + i]; i++) | |
478 | ; | |
479 | *miscmp_off = offset + i; | |
480 | pr_warn("Detected MISCOMPARE at offset %u\n", | |
481 | *miscmp_off); | |
ab628b9f | 482 | ret = TCM_MISCOMPARE_VERIFY; |
ab628b9f DD |
483 | } |
484 | kunmap_atomic(addr); | |
749c226c DD |
485 | if (ret != TCM_NO_SENSE) |
486 | goto out; | |
ab628b9f DD |
487 | |
488 | offset += len; | |
489 | cmp_len -= len; | |
490 | if (!cmp_len) | |
491 | break; | |
492 | } | |
493 | pr_debug("COMPARE AND WRITE read data matches compare data\n"); | |
ab628b9f DD |
494 | out: |
495 | kfree(buf); | |
496 | return ret; | |
497 | } | |
498 | ||
057085e5 NB |
499 | static sense_reason_t compare_and_write_callback(struct se_cmd *cmd, bool success, |
500 | int *post_ret) | |
68ff9b9b NB |
501 | { |
502 | struct se_device *dev = cmd->se_dev; | |
81b6ca6d | 503 | struct sg_table write_tbl = { }; |
ab628b9f | 504 | struct scatterlist *write_sg; |
68ff9b9b | 505 | struct sg_mapping_iter m; |
ab628b9f | 506 | unsigned int len; |
68ff9b9b | 507 | unsigned int block_size = dev->dev_attrib.block_size; |
ab628b9f | 508 | unsigned int compare_len = (cmd->t_task_nolb * block_size); |
749c226c | 509 | unsigned int miscmp_off = 0; |
68ff9b9b | 510 | sense_reason_t ret = TCM_NO_SENSE; |
ab628b9f | 511 | int i; |
68ff9b9b | 512 | |
cf6d1f09 NB |
513 | /* |
514 | * Handle early failure in transport_generic_request_failure(), | |
c8e63985 | 515 | * which will not have taken ->caw_sem yet.. |
cf6d1f09 | 516 | */ |
c8e63985 | 517 | if (!success && (!cmd->t_data_sg || !cmd->t_bidi_data_sg)) |
cf6d1f09 | 518 | return TCM_NO_SENSE; |
c8e63985 NB |
519 | /* |
520 | * Handle special case for zero-length COMPARE_AND_WRITE | |
521 | */ | |
522 | if (!cmd->data_length) | |
523 | goto out; | |
db60df88 NB |
524 | /* |
525 | * Immediately exit + release dev->caw_sem if command has already | |
526 | * been failed with a non-zero SCSI status. | |
527 | */ | |
528 | if (cmd->scsi_status) { | |
a71a5dc7 | 529 | pr_debug("compare_and_write_callback: non zero scsi_status:" |
db60df88 | 530 | " 0x%02x\n", cmd->scsi_status); |
a71a5dc7 NB |
531 | *post_ret = 1; |
532 | if (cmd->scsi_status == SAM_STAT_CHECK_CONDITION) | |
533 | ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
db60df88 NB |
534 | goto out; |
535 | } | |
cf6d1f09 | 536 | |
ab628b9f DD |
537 | ret = compare_and_write_do_cmp(cmd->t_bidi_data_sg, |
538 | cmd->t_bidi_data_nents, | |
539 | cmd->t_data_sg, | |
540 | cmd->t_data_nents, | |
749c226c DD |
541 | compare_len, |
542 | &miscmp_off); | |
543 | if (ret == TCM_MISCOMPARE_VERIFY) { | |
544 | /* | |
545 | * SBC-4 r15: 5.3 COMPARE AND WRITE command | |
546 | * In the sense data (see 4.18 and SPC-5) the offset from the | |
547 | * start of the Data-Out Buffer to the first byte of data that | |
548 | * was not equal shall be reported in the INFORMATION field. | |
549 | */ | |
550 | cmd->sense_info = miscmp_off; | |
551 | goto out; | |
552 | } else if (ret) | |
a2890087 | 553 | goto out; |
68ff9b9b | 554 | |
81b6ca6d | 555 | if (sg_alloc_table(&write_tbl, cmd->t_data_nents, GFP_KERNEL) < 0) { |
68ff9b9b NB |
556 | pr_err("Unable to allocate compare_and_write sg\n"); |
557 | ret = TCM_OUT_OF_RESOURCES; | |
558 | goto out; | |
559 | } | |
81b6ca6d | 560 | write_sg = write_tbl.sgl; |
68ff9b9b NB |
561 | |
562 | i = 0; | |
ab628b9f | 563 | len = compare_len; |
68ff9b9b NB |
564 | sg_miter_start(&m, cmd->t_data_sg, cmd->t_data_nents, SG_MITER_TO_SG); |
565 | /* | |
566 | * Currently assumes NoLB=1 and SGLs are PAGE_SIZE.. | |
567 | */ | |
568 | while (len) { | |
569 | sg_miter_next(&m); | |
570 | ||
571 | if (block_size < PAGE_SIZE) { | |
572 | sg_set_page(&write_sg[i], m.page, block_size, | |
d94e5a61 | 573 | m.piter.sg->offset + block_size); |
68ff9b9b NB |
574 | } else { |
575 | sg_miter_next(&m); | |
576 | sg_set_page(&write_sg[i], m.page, block_size, | |
d94e5a61 | 577 | m.piter.sg->offset); |
68ff9b9b NB |
578 | } |
579 | len -= block_size; | |
580 | i++; | |
581 | } | |
582 | sg_miter_stop(&m); | |
583 | /* | |
584 | * Save the original SGL + nents values before updating to new | |
585 | * assignments, to be released in transport_free_pages() -> | |
586 | * transport_reset_sgl_orig() | |
587 | */ | |
588 | cmd->t_data_sg_orig = cmd->t_data_sg; | |
589 | cmd->t_data_sg = write_sg; | |
590 | cmd->t_data_nents_orig = cmd->t_data_nents; | |
591 | cmd->t_data_nents = 1; | |
592 | ||
68d81f40 | 593 | cmd->sam_task_attr = TCM_HEAD_TAG; |
68ff9b9b NB |
594 | cmd->transport_complete_callback = compare_and_write_post; |
595 | /* | |
596 | * Now reset ->execute_cmd() to the normal sbc_execute_rw() handler | |
597 | * for submitting the adjusted SGL to write instance user-data. | |
598 | */ | |
599 | cmd->execute_cmd = sbc_execute_rw; | |
600 | ||
601 | spin_lock_irq(&cmd->t_state_lock); | |
602 | cmd->t_state = TRANSPORT_PROCESSING; | |
fd5e64de | 603 | cmd->transport_state |= CMD_T_ACTIVE | CMD_T_SENT; |
68ff9b9b NB |
604 | spin_unlock_irq(&cmd->t_state_lock); |
605 | ||
dff0ca9e | 606 | __target_execute_cmd(cmd, false); |
68ff9b9b | 607 | |
68ff9b9b NB |
608 | return ret; |
609 | ||
68ff9b9b NB |
610 | out: |
611 | /* | |
612 | * In the MISCOMPARE or failure case, unlock ->caw_sem obtained in | |
613 | * sbc_compare_and_write() before the original READ I/O submission. | |
614 | */ | |
615 | up(&dev->caw_sem); | |
81b6ca6d | 616 | sg_free_table(&write_tbl); |
68ff9b9b NB |
617 | return ret; |
618 | } | |
619 | ||
620 | static sense_reason_t | |
621 | sbc_compare_and_write(struct se_cmd *cmd) | |
622 | { | |
7a971b1b | 623 | struct sbc_ops *ops = cmd->protocol_data; |
68ff9b9b NB |
624 | struct se_device *dev = cmd->se_dev; |
625 | sense_reason_t ret; | |
626 | int rc; | |
627 | /* | |
628 | * Submit the READ first for COMPARE_AND_WRITE to perform the | |
629 | * comparision using SGLs at cmd->t_bidi_data_sg.. | |
630 | */ | |
631 | rc = down_interruptible(&dev->caw_sem); | |
ee7619f2 | 632 | if (rc != 0) { |
68ff9b9b NB |
633 | cmd->transport_complete_callback = NULL; |
634 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
635 | } | |
b7191253 NB |
636 | /* |
637 | * Reset cmd->data_length to individual block_size in order to not | |
638 | * confuse backend drivers that depend on this value matching the | |
639 | * size of the I/O being submitted. | |
640 | */ | |
641 | cmd->data_length = cmd->t_task_nolb * dev->dev_attrib.block_size; | |
68ff9b9b | 642 | |
7a971b1b | 643 | ret = ops->execute_rw(cmd, cmd->t_bidi_data_sg, cmd->t_bidi_data_nents, |
68ff9b9b NB |
644 | DMA_FROM_DEVICE); |
645 | if (ret) { | |
646 | cmd->transport_complete_callback = NULL; | |
647 | up(&dev->caw_sem); | |
648 | return ret; | |
649 | } | |
650 | /* | |
651 | * Unlock of dev->caw_sem to occur in compare_and_write_callback() | |
652 | * upon MISCOMPARE, or in compare_and_write_done() upon completion | |
653 | * of WRITE instance user-data. | |
654 | */ | |
655 | return TCM_NO_SENSE; | |
656 | } | |
657 | ||
19f9361a | 658 | static int |
38b57f82 | 659 | sbc_set_prot_op_checks(u8 protect, bool fabric_prot, enum target_prot_type prot_type, |
19f9361a SG |
660 | bool is_write, struct se_cmd *cmd) |
661 | { | |
662 | if (is_write) { | |
38b57f82 NB |
663 | cmd->prot_op = fabric_prot ? TARGET_PROT_DOUT_STRIP : |
664 | protect ? TARGET_PROT_DOUT_PASS : | |
665 | TARGET_PROT_DOUT_INSERT; | |
19f9361a SG |
666 | switch (protect) { |
667 | case 0x0: | |
668 | case 0x3: | |
669 | cmd->prot_checks = 0; | |
670 | break; | |
671 | case 0x1: | |
672 | case 0x5: | |
673 | cmd->prot_checks = TARGET_DIF_CHECK_GUARD; | |
674 | if (prot_type == TARGET_DIF_TYPE1_PROT) | |
675 | cmd->prot_checks |= TARGET_DIF_CHECK_REFTAG; | |
676 | break; | |
677 | case 0x2: | |
678 | if (prot_type == TARGET_DIF_TYPE1_PROT) | |
679 | cmd->prot_checks = TARGET_DIF_CHECK_REFTAG; | |
680 | break; | |
681 | case 0x4: | |
682 | cmd->prot_checks = TARGET_DIF_CHECK_GUARD; | |
683 | break; | |
684 | default: | |
685 | pr_err("Unsupported protect field %d\n", protect); | |
686 | return -EINVAL; | |
687 | } | |
688 | } else { | |
38b57f82 NB |
689 | cmd->prot_op = fabric_prot ? TARGET_PROT_DIN_INSERT : |
690 | protect ? TARGET_PROT_DIN_PASS : | |
691 | TARGET_PROT_DIN_STRIP; | |
19f9361a SG |
692 | switch (protect) { |
693 | case 0x0: | |
694 | case 0x1: | |
695 | case 0x5: | |
696 | cmd->prot_checks = TARGET_DIF_CHECK_GUARD; | |
697 | if (prot_type == TARGET_DIF_TYPE1_PROT) | |
698 | cmd->prot_checks |= TARGET_DIF_CHECK_REFTAG; | |
699 | break; | |
700 | case 0x2: | |
701 | if (prot_type == TARGET_DIF_TYPE1_PROT) | |
702 | cmd->prot_checks = TARGET_DIF_CHECK_REFTAG; | |
703 | break; | |
704 | case 0x3: | |
705 | cmd->prot_checks = 0; | |
706 | break; | |
707 | case 0x4: | |
708 | cmd->prot_checks = TARGET_DIF_CHECK_GUARD; | |
709 | break; | |
710 | default: | |
711 | pr_err("Unsupported protect field %d\n", protect); | |
712 | return -EINVAL; | |
713 | } | |
714 | } | |
715 | ||
716 | return 0; | |
717 | } | |
718 | ||
f7b7c06f | 719 | static sense_reason_t |
6d8e7e7c | 720 | sbc_check_prot(struct se_device *dev, struct se_cmd *cmd, unsigned char protect, |
19f9361a | 721 | u32 sectors, bool is_write) |
499bf77b | 722 | { |
38b57f82 NB |
723 | int sp_ops = cmd->se_sess->sup_prot_ops; |
724 | int pi_prot_type = dev->dev_attrib.pi_prot_type; | |
725 | bool fabric_prot = false; | |
19f9361a | 726 | |
f7b7c06f | 727 | if (!cmd->t_prot_sg || !cmd->t_prot_nents) { |
38b57f82 NB |
728 | if (unlikely(protect && |
729 | !dev->dev_attrib.pi_prot_type && !cmd->se_sess->sess_prot_type)) { | |
730 | pr_err("CDB contains protect bit, but device + fabric does" | |
731 | " not advertise PROTECT=1 feature bit\n"); | |
f7b7c06f NB |
732 | return TCM_INVALID_CDB_FIELD; |
733 | } | |
734 | if (cmd->prot_pto) | |
735 | return TCM_NO_SENSE; | |
736 | } | |
499bf77b NB |
737 | |
738 | switch (dev->dev_attrib.pi_prot_type) { | |
739 | case TARGET_DIF_TYPE3_PROT: | |
499bf77b NB |
740 | cmd->reftag_seed = 0xffffffff; |
741 | break; | |
742 | case TARGET_DIF_TYPE2_PROT: | |
19f9361a | 743 | if (protect) |
f7b7c06f | 744 | return TCM_INVALID_CDB_FIELD; |
499bf77b NB |
745 | |
746 | cmd->reftag_seed = cmd->t_task_lba; | |
747 | break; | |
748 | case TARGET_DIF_TYPE1_PROT: | |
499bf77b NB |
749 | cmd->reftag_seed = cmd->t_task_lba; |
750 | break; | |
751 | case TARGET_DIF_TYPE0_PROT: | |
38b57f82 NB |
752 | /* |
753 | * See if the fabric supports T10-PI, and the session has been | |
754 | * configured to allow export PROTECT=1 feature bit with backend | |
755 | * devices that don't support T10-PI. | |
756 | */ | |
757 | fabric_prot = is_write ? | |
758 | !!(sp_ops & (TARGET_PROT_DOUT_PASS | TARGET_PROT_DOUT_STRIP)) : | |
759 | !!(sp_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DIN_INSERT)); | |
760 | ||
761 | if (fabric_prot && cmd->se_sess->sess_prot_type) { | |
762 | pi_prot_type = cmd->se_sess->sess_prot_type; | |
763 | break; | |
764 | } | |
cceca4a6 NB |
765 | if (!protect) |
766 | return TCM_NO_SENSE; | |
df561f66 | 767 | fallthrough; |
499bf77b | 768 | default: |
cceca4a6 | 769 | pr_err("Unable to determine pi_prot_type for CDB: 0x%02x " |
6d8e7e7c | 770 | "PROTECT: 0x%02x\n", cmd->t_task_cdb[0], protect); |
cceca4a6 | 771 | return TCM_INVALID_CDB_FIELD; |
499bf77b NB |
772 | } |
773 | ||
38b57f82 | 774 | if (sbc_set_prot_op_checks(protect, fabric_prot, pi_prot_type, is_write, cmd)) |
f7b7c06f | 775 | return TCM_INVALID_CDB_FIELD; |
19f9361a | 776 | |
38b57f82 | 777 | cmd->prot_type = pi_prot_type; |
499bf77b | 778 | cmd->prot_length = dev->prot_length * sectors; |
e2a4f55c SG |
779 | |
780 | /** | |
781 | * In case protection information exists over the wire | |
782 | * we modify command data length to describe pure data. | |
783 | * The actual transfer length is data length + protection | |
784 | * length | |
785 | **/ | |
786 | if (protect) | |
787 | cmd->data_length = sectors * dev->dev_attrib.block_size; | |
788 | ||
789 | pr_debug("%s: prot_type=%d, data_length=%d, prot_length=%d " | |
790 | "prot_op=%d prot_checks=%d\n", | |
791 | __func__, cmd->prot_type, cmd->data_length, cmd->prot_length, | |
03abad9e | 792 | cmd->prot_op, cmd->prot_checks); |
499bf77b | 793 | |
f7b7c06f | 794 | return TCM_NO_SENSE; |
499bf77b NB |
795 | } |
796 | ||
fde9f50f NB |
797 | static int |
798 | sbc_check_dpofua(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb) | |
799 | { | |
800 | if (cdb[1] & 0x10) { | |
814e5b45 CH |
801 | /* see explanation in spc_emulate_modesense */ |
802 | if (!target_check_fua(dev)) { | |
fde9f50f NB |
803 | pr_err("Got CDB: 0x%02x with DPO bit set, but device" |
804 | " does not advertise support for DPO\n", cdb[0]); | |
805 | return -EINVAL; | |
806 | } | |
807 | } | |
808 | if (cdb[1] & 0x8) { | |
814e5b45 | 809 | if (!target_check_fua(dev)) { |
fde9f50f NB |
810 | pr_err("Got CDB: 0x%02x with FUA bit set, but device" |
811 | " does not advertise support for FUA write\n", | |
812 | cdb[0]); | |
813 | return -EINVAL; | |
814 | } | |
815 | cmd->se_cmd_flags |= SCF_FUA; | |
816 | } | |
817 | return 0; | |
499bf77b NB |
818 | } |
819 | ||
de103c93 CH |
820 | sense_reason_t |
821 | sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops) | |
d6e0175c | 822 | { |
d6e0175c CH |
823 | struct se_device *dev = cmd->se_dev; |
824 | unsigned char *cdb = cmd->t_task_cdb; | |
1fd032ee | 825 | unsigned int size; |
d6e0175c | 826 | u32 sectors = 0; |
de103c93 | 827 | sense_reason_t ret; |
d6e0175c | 828 | |
7a971b1b CH |
829 | cmd->protocol_data = ops; |
830 | ||
d6e0175c CH |
831 | switch (cdb[0]) { |
832 | case READ_6: | |
833 | sectors = transport_get_sectors_6(cdb); | |
834 | cmd->t_task_lba = transport_lba_21(cdb); | |
835 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
a82a9538 | 836 | cmd->execute_cmd = sbc_execute_rw; |
d6e0175c CH |
837 | break; |
838 | case READ_10: | |
839 | sectors = transport_get_sectors_10(cdb); | |
840 | cmd->t_task_lba = transport_lba_32(cdb); | |
499bf77b | 841 | |
fde9f50f NB |
842 | if (sbc_check_dpofua(dev, cmd, cdb)) |
843 | return TCM_INVALID_CDB_FIELD; | |
844 | ||
6d8e7e7c | 845 | ret = sbc_check_prot(dev, cmd, cdb[1] >> 5, sectors, false); |
f7b7c06f NB |
846 | if (ret) |
847 | return ret; | |
499bf77b | 848 | |
d6e0175c | 849 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
a82a9538 | 850 | cmd->execute_cmd = sbc_execute_rw; |
d6e0175c CH |
851 | break; |
852 | case READ_12: | |
853 | sectors = transport_get_sectors_12(cdb); | |
854 | cmd->t_task_lba = transport_lba_32(cdb); | |
499bf77b | 855 | |
fde9f50f NB |
856 | if (sbc_check_dpofua(dev, cmd, cdb)) |
857 | return TCM_INVALID_CDB_FIELD; | |
858 | ||
6d8e7e7c | 859 | ret = sbc_check_prot(dev, cmd, cdb[1] >> 5, sectors, false); |
f7b7c06f NB |
860 | if (ret) |
861 | return ret; | |
499bf77b | 862 | |
d6e0175c | 863 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
a82a9538 | 864 | cmd->execute_cmd = sbc_execute_rw; |
d6e0175c CH |
865 | break; |
866 | case READ_16: | |
867 | sectors = transport_get_sectors_16(cdb); | |
868 | cmd->t_task_lba = transport_lba_64(cdb); | |
499bf77b | 869 | |
fde9f50f NB |
870 | if (sbc_check_dpofua(dev, cmd, cdb)) |
871 | return TCM_INVALID_CDB_FIELD; | |
872 | ||
6d8e7e7c | 873 | ret = sbc_check_prot(dev, cmd, cdb[1] >> 5, sectors, false); |
f7b7c06f NB |
874 | if (ret) |
875 | return ret; | |
499bf77b | 876 | |
d6e0175c | 877 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
a82a9538 | 878 | cmd->execute_cmd = sbc_execute_rw; |
d6e0175c CH |
879 | break; |
880 | case WRITE_6: | |
881 | sectors = transport_get_sectors_6(cdb); | |
882 | cmd->t_task_lba = transport_lba_21(cdb); | |
883 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
a82a9538 | 884 | cmd->execute_cmd = sbc_execute_rw; |
d6e0175c CH |
885 | break; |
886 | case WRITE_10: | |
984a9d4c | 887 | case WRITE_VERIFY: |
d6e0175c CH |
888 | sectors = transport_get_sectors_10(cdb); |
889 | cmd->t_task_lba = transport_lba_32(cdb); | |
499bf77b | 890 | |
fde9f50f NB |
891 | if (sbc_check_dpofua(dev, cmd, cdb)) |
892 | return TCM_INVALID_CDB_FIELD; | |
893 | ||
6d8e7e7c | 894 | ret = sbc_check_prot(dev, cmd, cdb[1] >> 5, sectors, true); |
f7b7c06f NB |
895 | if (ret) |
896 | return ret; | |
499bf77b | 897 | |
d6e0175c | 898 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
a82a9538 | 899 | cmd->execute_cmd = sbc_execute_rw; |
d6e0175c CH |
900 | break; |
901 | case WRITE_12: | |
902 | sectors = transport_get_sectors_12(cdb); | |
903 | cmd->t_task_lba = transport_lba_32(cdb); | |
499bf77b | 904 | |
fde9f50f NB |
905 | if (sbc_check_dpofua(dev, cmd, cdb)) |
906 | return TCM_INVALID_CDB_FIELD; | |
907 | ||
6d8e7e7c | 908 | ret = sbc_check_prot(dev, cmd, cdb[1] >> 5, sectors, true); |
f7b7c06f NB |
909 | if (ret) |
910 | return ret; | |
499bf77b | 911 | |
d6e0175c | 912 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
a82a9538 | 913 | cmd->execute_cmd = sbc_execute_rw; |
d6e0175c CH |
914 | break; |
915 | case WRITE_16: | |
984a9d4c | 916 | case WRITE_VERIFY_16: |
d6e0175c CH |
917 | sectors = transport_get_sectors_16(cdb); |
918 | cmd->t_task_lba = transport_lba_64(cdb); | |
499bf77b | 919 | |
fde9f50f NB |
920 | if (sbc_check_dpofua(dev, cmd, cdb)) |
921 | return TCM_INVALID_CDB_FIELD; | |
922 | ||
6d8e7e7c | 923 | ret = sbc_check_prot(dev, cmd, cdb[1] >> 5, sectors, true); |
f7b7c06f NB |
924 | if (ret) |
925 | return ret; | |
499bf77b | 926 | |
d6e0175c | 927 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
a82a9538 | 928 | cmd->execute_cmd = sbc_execute_rw; |
d6e0175c CH |
929 | break; |
930 | case XDWRITEREAD_10: | |
de103c93 | 931 | if (cmd->data_direction != DMA_TO_DEVICE || |
d6e0175c | 932 | !(cmd->se_cmd_flags & SCF_BIDI)) |
de103c93 | 933 | return TCM_INVALID_CDB_FIELD; |
d6e0175c CH |
934 | sectors = transport_get_sectors_10(cdb); |
935 | ||
fde9f50f NB |
936 | if (sbc_check_dpofua(dev, cmd, cdb)) |
937 | return TCM_INVALID_CDB_FIELD; | |
938 | ||
d6e0175c CH |
939 | cmd->t_task_lba = transport_lba_32(cdb); |
940 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
941 | ||
942 | /* | |
943 | * Setup BIDI XOR callback to be run after I/O completion. | |
944 | */ | |
a82a9538 | 945 | cmd->execute_cmd = sbc_execute_rw; |
d6e0175c | 946 | cmd->transport_complete_callback = &xdreadwrite_callback; |
d6e0175c CH |
947 | break; |
948 | case VARIABLE_LENGTH_CMD: | |
949 | { | |
950 | u16 service_action = get_unaligned_be16(&cdb[8]); | |
951 | switch (service_action) { | |
952 | case XDWRITEREAD_32: | |
953 | sectors = transport_get_sectors_32(cdb); | |
954 | ||
fde9f50f NB |
955 | if (sbc_check_dpofua(dev, cmd, cdb)) |
956 | return TCM_INVALID_CDB_FIELD; | |
d6e0175c CH |
957 | /* |
958 | * Use WRITE_32 and READ_32 opcodes for the emulated | |
959 | * XDWRITE_READ_32 logic. | |
960 | */ | |
961 | cmd->t_task_lba = transport_lba_64_ext(cdb); | |
962 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
963 | ||
964 | /* | |
965 | * Setup BIDI XOR callback to be run during after I/O | |
966 | * completion. | |
967 | */ | |
a82a9538 | 968 | cmd->execute_cmd = sbc_execute_rw; |
d6e0175c | 969 | cmd->transport_complete_callback = &xdreadwrite_callback; |
d6e0175c CH |
970 | break; |
971 | case WRITE_SAME_32: | |
972 | sectors = transport_get_sectors_32(cdb); | |
973 | if (!sectors) { | |
974 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not" | |
975 | " supported\n"); | |
de103c93 | 976 | return TCM_INVALID_CDB_FIELD; |
d6e0175c CH |
977 | } |
978 | ||
1fd032ee | 979 | size = sbc_get_size(cmd, 1); |
d6e0175c CH |
980 | cmd->t_task_lba = get_unaligned_be64(&cdb[12]); |
981 | ||
6d8e7e7c | 982 | ret = sbc_setup_write_same(cmd, cdb[10], ops); |
6b64e1fe | 983 | if (ret) |
cd063bef | 984 | return ret; |
d6e0175c CH |
985 | break; |
986 | default: | |
987 | pr_err("VARIABLE_LENGTH_CMD service action" | |
988 | " 0x%04x not supported\n", service_action); | |
de103c93 | 989 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
d6e0175c CH |
990 | } |
991 | break; | |
992 | } | |
68ff9b9b | 993 | case COMPARE_AND_WRITE: |
12f66e4a | 994 | if (!dev->dev_attrib.emulate_caw) { |
6f3bf5a2 BVA |
995 | pr_err_ratelimited("se_device %s/%s (vpd_unit_serial %s) reject COMPARE_AND_WRITE\n", |
996 | dev->se_hba->backend->ops->name, | |
997 | config_item_name(&dev->dev_group.cg_item), | |
998 | dev->t10_wwn.unit_serial); | |
12f66e4a JY |
999 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
1000 | } | |
68ff9b9b NB |
1001 | sectors = cdb[13]; |
1002 | /* | |
1003 | * Currently enforce COMPARE_AND_WRITE for a single sector | |
1004 | */ | |
1005 | if (sectors > 1) { | |
1006 | pr_err("COMPARE_AND_WRITE contains NoLB: %u greater" | |
1007 | " than 1\n", sectors); | |
1008 | return TCM_INVALID_CDB_FIELD; | |
1009 | } | |
ab81a5e0 DD |
1010 | if (sbc_check_dpofua(dev, cmd, cdb)) |
1011 | return TCM_INVALID_CDB_FIELD; | |
1012 | ||
68ff9b9b NB |
1013 | /* |
1014 | * Double size because we have two buffers, note that | |
1015 | * zero is not an error.. | |
1016 | */ | |
1017 | size = 2 * sbc_get_size(cmd, sectors); | |
1018 | cmd->t_task_lba = get_unaligned_be64(&cdb[2]); | |
1019 | cmd->t_task_nolb = sectors; | |
1020 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB | SCF_COMPARE_AND_WRITE; | |
68ff9b9b NB |
1021 | cmd->execute_cmd = sbc_compare_and_write; |
1022 | cmd->transport_complete_callback = compare_and_write_callback; | |
1023 | break; | |
d6e0175c | 1024 | case READ_CAPACITY: |
1fd032ee CH |
1025 | size = READ_CAP_LEN; |
1026 | cmd->execute_cmd = sbc_emulate_readcapacity; | |
d6e0175c | 1027 | break; |
eb846d9f | 1028 | case SERVICE_ACTION_IN_16: |
d6e0175c CH |
1029 | switch (cmd->t_task_cdb[1] & 0x1f) { |
1030 | case SAI_READ_CAPACITY_16: | |
1fd032ee | 1031 | cmd->execute_cmd = sbc_emulate_readcapacity_16; |
d6e0175c | 1032 | break; |
c66094bf HR |
1033 | case SAI_REPORT_REFERRALS: |
1034 | cmd->execute_cmd = target_emulate_report_referrals; | |
1035 | break; | |
d6e0175c CH |
1036 | default: |
1037 | pr_err("Unsupported SA: 0x%02x\n", | |
1038 | cmd->t_task_cdb[1] & 0x1f); | |
de103c93 | 1039 | return TCM_INVALID_CDB_FIELD; |
d6e0175c | 1040 | } |
a85d667e | 1041 | size = get_unaligned_be32(&cdb[10]); |
d6e0175c CH |
1042 | break; |
1043 | case SYNCHRONIZE_CACHE: | |
1044 | case SYNCHRONIZE_CACHE_16: | |
d6e0175c CH |
1045 | if (cdb[0] == SYNCHRONIZE_CACHE) { |
1046 | sectors = transport_get_sectors_10(cdb); | |
1047 | cmd->t_task_lba = transport_lba_32(cdb); | |
1048 | } else { | |
1049 | sectors = transport_get_sectors_16(cdb); | |
1050 | cmd->t_task_lba = transport_lba_64(cdb); | |
1051 | } | |
6ef31dc7 CVB |
1052 | if (ops->execute_sync_cache) { |
1053 | cmd->execute_cmd = ops->execute_sync_cache; | |
1054 | goto check_lba; | |
d6e0175c | 1055 | } |
6ef31dc7 CVB |
1056 | size = 0; |
1057 | cmd->execute_cmd = sbc_emulate_noop; | |
d6e0175c CH |
1058 | break; |
1059 | case UNMAP: | |
14150a6b | 1060 | if (!ops->execute_unmap) |
de103c93 | 1061 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
14150a6b | 1062 | |
61fdb4ac NB |
1063 | if (!dev->dev_attrib.emulate_tpu) { |
1064 | pr_err("Got UNMAP, but backend device has" | |
1065 | " emulate_tpu disabled\n"); | |
1066 | return TCM_UNSUPPORTED_SCSI_OPCODE; | |
1067 | } | |
1fd032ee | 1068 | size = get_unaligned_be16(&cdb[7]); |
62e46942 | 1069 | cmd->execute_cmd = sbc_execute_unmap; |
d6e0175c CH |
1070 | break; |
1071 | case WRITE_SAME_16: | |
1072 | sectors = transport_get_sectors_16(cdb); | |
1073 | if (!sectors) { | |
1074 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); | |
de103c93 | 1075 | return TCM_INVALID_CDB_FIELD; |
d6e0175c CH |
1076 | } |
1077 | ||
1fd032ee | 1078 | size = sbc_get_size(cmd, 1); |
d6e0175c CH |
1079 | cmd->t_task_lba = get_unaligned_be64(&cdb[2]); |
1080 | ||
6d8e7e7c | 1081 | ret = sbc_setup_write_same(cmd, cdb[1], ops); |
6b64e1fe | 1082 | if (ret) |
cd063bef | 1083 | return ret; |
d6e0175c CH |
1084 | break; |
1085 | case WRITE_SAME: | |
1086 | sectors = transport_get_sectors_10(cdb); | |
1087 | if (!sectors) { | |
1088 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); | |
de103c93 | 1089 | return TCM_INVALID_CDB_FIELD; |
d6e0175c CH |
1090 | } |
1091 | ||
1fd032ee | 1092 | size = sbc_get_size(cmd, 1); |
d6e0175c CH |
1093 | cmd->t_task_lba = get_unaligned_be32(&cdb[2]); |
1094 | ||
1095 | /* | |
1096 | * Follow sbcr26 with WRITE_SAME (10) and check for the existence | |
1097 | * of byte 1 bit 3 UNMAP instead of original reserved field | |
1098 | */ | |
6d8e7e7c | 1099 | ret = sbc_setup_write_same(cmd, cdb[1], ops); |
6b64e1fe | 1100 | if (ret) |
cd063bef | 1101 | return ret; |
d6e0175c CH |
1102 | break; |
1103 | case VERIFY: | |
13603685 | 1104 | case VERIFY_16: |
984a9d4c NB |
1105 | size = 0; |
1106 | if (cdb[0] == VERIFY) { | |
1107 | sectors = transport_get_sectors_10(cdb); | |
1108 | cmd->t_task_lba = transport_lba_32(cdb); | |
1109 | } else { | |
1110 | sectors = transport_get_sectors_16(cdb); | |
1111 | cmd->t_task_lba = transport_lba_64(cdb); | |
1112 | } | |
1920ed61 | 1113 | cmd->execute_cmd = sbc_emulate_noop; |
c52716de | 1114 | goto check_lba; |
1a1ff38c BK |
1115 | case REZERO_UNIT: |
1116 | case SEEK_6: | |
1117 | case SEEK_10: | |
1118 | /* | |
1119 | * There are still clients out there which use these old SCSI-2 | |
1120 | * commands. This mainly happens when running VMs with legacy | |
1121 | * guest systems, connected via SCSI command pass-through to | |
1122 | * iSCSI targets. Make them happy and return status GOOD. | |
1123 | */ | |
1124 | size = 0; | |
1125 | cmd->execute_cmd = sbc_emulate_noop; | |
1126 | break; | |
45182ed5 BB |
1127 | case START_STOP: |
1128 | size = 0; | |
1129 | cmd->execute_cmd = sbc_emulate_startstop; | |
1130 | break; | |
d6e0175c | 1131 | default: |
1fd032ee | 1132 | ret = spc_parse_cdb(cmd, &size); |
d6e0175c CH |
1133 | if (ret) |
1134 | return ret; | |
1135 | } | |
1136 | ||
1137 | /* reject any command that we don't have a handler for */ | |
20959c4b | 1138 | if (!cmd->execute_cmd) |
de103c93 | 1139 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
d6e0175c CH |
1140 | |
1141 | if (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) { | |
1fd032ee | 1142 | unsigned long long end_lba; |
6ef31dc7 | 1143 | check_lba: |
1fd032ee | 1144 | end_lba = dev->transport->get_blocks(dev) + 1; |
aa179935 NB |
1145 | if (((cmd->t_task_lba + sectors) < cmd->t_task_lba) || |
1146 | ((cmd->t_task_lba + sectors) > end_lba)) { | |
1fd032ee CH |
1147 | pr_err("cmd exceeds last lba %llu " |
1148 | "(lba %llu, sectors %u)\n", | |
1149 | end_lba, cmd->t_task_lba, sectors); | |
09ceadc7 | 1150 | return TCM_ADDRESS_OUT_OF_RANGE; |
1fd032ee CH |
1151 | } |
1152 | ||
68ff9b9b NB |
1153 | if (!(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) |
1154 | size = sbc_get_size(cmd, sectors); | |
d6e0175c CH |
1155 | } |
1156 | ||
de103c93 | 1157 | return target_cmd_size_check(cmd, size); |
d6e0175c CH |
1158 | } |
1159 | EXPORT_SYMBOL(sbc_parse_cdb); | |
6f23ac8a | 1160 | |
6f23ac8a CH |
1161 | u32 sbc_get_device_type(struct se_device *dev) |
1162 | { | |
1163 | return TYPE_DISK; | |
1164 | } | |
1165 | EXPORT_SYMBOL(sbc_get_device_type); | |
86d71829 | 1166 | |
62e46942 CH |
1167 | static sense_reason_t |
1168 | sbc_execute_unmap(struct se_cmd *cmd) | |
86d71829 | 1169 | { |
62e46942 | 1170 | struct sbc_ops *ops = cmd->protocol_data; |
86d71829 AH |
1171 | struct se_device *dev = cmd->se_dev; |
1172 | unsigned char *buf, *ptr = NULL; | |
1173 | sector_t lba; | |
1174 | int size; | |
1175 | u32 range; | |
1176 | sense_reason_t ret = 0; | |
1177 | int dl, bd_dl; | |
1178 | ||
1179 | /* We never set ANC_SUP */ | |
1180 | if (cmd->t_task_cdb[1]) | |
1181 | return TCM_INVALID_CDB_FIELD; | |
1182 | ||
1183 | if (cmd->data_length == 0) { | |
1184 | target_complete_cmd(cmd, SAM_STAT_GOOD); | |
1185 | return 0; | |
1186 | } | |
1187 | ||
1188 | if (cmd->data_length < 8) { | |
1189 | pr_warn("UNMAP parameter list length %u too small\n", | |
1190 | cmd->data_length); | |
1191 | return TCM_PARAMETER_LIST_LENGTH_ERROR; | |
1192 | } | |
1193 | ||
1194 | buf = transport_kmap_data_sg(cmd); | |
1195 | if (!buf) | |
1196 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
1197 | ||
1198 | dl = get_unaligned_be16(&buf[0]); | |
1199 | bd_dl = get_unaligned_be16(&buf[2]); | |
1200 | ||
1201 | size = cmd->data_length - 8; | |
1202 | if (bd_dl > size) | |
1203 | pr_warn("UNMAP parameter list length %u too small, ignoring bd_dl %u\n", | |
1204 | cmd->data_length, bd_dl); | |
1205 | else | |
1206 | size = bd_dl; | |
1207 | ||
1208 | if (size / 16 > dev->dev_attrib.max_unmap_block_desc_count) { | |
1209 | ret = TCM_INVALID_PARAMETER_LIST; | |
1210 | goto err; | |
1211 | } | |
1212 | ||
1213 | /* First UNMAP block descriptor starts at 8 byte offset */ | |
1214 | ptr = &buf[8]; | |
1215 | pr_debug("UNMAP: Sub: %s Using dl: %u bd_dl: %u size: %u" | |
1216 | " ptr: %p\n", dev->transport->name, dl, bd_dl, size, ptr); | |
1217 | ||
1218 | while (size >= 16) { | |
1219 | lba = get_unaligned_be64(&ptr[0]); | |
1220 | range = get_unaligned_be32(&ptr[8]); | |
1221 | pr_debug("UNMAP: Using lba: %llu and range: %u\n", | |
1222 | (unsigned long long)lba, range); | |
1223 | ||
1224 | if (range > dev->dev_attrib.max_unmap_lba_count) { | |
1225 | ret = TCM_INVALID_PARAMETER_LIST; | |
1226 | goto err; | |
1227 | } | |
1228 | ||
1229 | if (lba + range > dev->transport->get_blocks(dev) + 1) { | |
1230 | ret = TCM_ADDRESS_OUT_OF_RANGE; | |
1231 | goto err; | |
1232 | } | |
1233 | ||
9960f851 AV |
1234 | if (range) { |
1235 | ret = ops->execute_unmap(cmd, lba, range); | |
1236 | if (ret) | |
1237 | goto err; | |
1238 | } | |
86d71829 AH |
1239 | |
1240 | ptr += 16; | |
1241 | size -= 16; | |
1242 | } | |
1243 | ||
1244 | err: | |
1245 | transport_kunmap_data_sg(cmd); | |
1246 | if (!ret) | |
14b40c1e | 1247 | target_complete_cmd(cmd, SAM_STAT_GOOD); |
86d71829 AH |
1248 | return ret; |
1249 | } | |
41861fa8 | 1250 | |
66a3d5bc NB |
1251 | void |
1252 | sbc_dif_generate(struct se_cmd *cmd) | |
1253 | { | |
1254 | struct se_device *dev = cmd->se_dev; | |
fe052a18 | 1255 | struct t10_pi_tuple *sdt; |
18213afb | 1256 | struct scatterlist *dsg = cmd->t_data_sg, *psg; |
66a3d5bc NB |
1257 | sector_t sector = cmd->t_task_lba; |
1258 | void *daddr, *paddr; | |
1259 | int i, j, offset = 0; | |
18213afb | 1260 | unsigned int block_size = dev->dev_attrib.block_size; |
66a3d5bc | 1261 | |
18213afb | 1262 | for_each_sg(cmd->t_prot_sg, psg, cmd->t_prot_nents, i) { |
66a3d5bc | 1263 | paddr = kmap_atomic(sg_page(psg)) + psg->offset; |
18213afb | 1264 | daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; |
66a3d5bc | 1265 | |
18213afb | 1266 | for (j = 0; j < psg->length; |
fe052a18 | 1267 | j += sizeof(*sdt)) { |
18213afb AM |
1268 | __u16 crc; |
1269 | unsigned int avail; | |
66a3d5bc | 1270 | |
18213afb AM |
1271 | if (offset >= dsg->length) { |
1272 | offset -= dsg->length; | |
1273 | kunmap_atomic(daddr - dsg->offset); | |
1274 | dsg = sg_next(dsg); | |
1275 | if (!dsg) { | |
1276 | kunmap_atomic(paddr - psg->offset); | |
1277 | return; | |
1278 | } | |
1279 | daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; | |
66a3d5bc | 1280 | } |
66a3d5bc | 1281 | |
18213afb AM |
1282 | sdt = paddr + j; |
1283 | avail = min(block_size, dsg->length - offset); | |
1284 | crc = crc_t10dif(daddr + offset, avail); | |
1285 | if (avail < block_size) { | |
1286 | kunmap_atomic(daddr - dsg->offset); | |
1287 | dsg = sg_next(dsg); | |
1288 | if (!dsg) { | |
1289 | kunmap_atomic(paddr - psg->offset); | |
1290 | return; | |
1291 | } | |
1292 | daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; | |
1293 | offset = block_size - avail; | |
1294 | crc = crc_t10dif_update(crc, daddr, offset); | |
1295 | } else { | |
1296 | offset += block_size; | |
66a3d5bc NB |
1297 | } |
1298 | ||
18213afb | 1299 | sdt->guard_tag = cpu_to_be16(crc); |
823ddd87 | 1300 | if (cmd->prot_type == TARGET_DIF_TYPE1_PROT) |
66a3d5bc NB |
1301 | sdt->ref_tag = cpu_to_be32(sector & 0xffffffff); |
1302 | sdt->app_tag = 0; | |
1303 | ||
6ae50408 | 1304 | pr_debug("DIF %s INSERT sector: %llu guard_tag: 0x%04x" |
66a3d5bc | 1305 | " app_tag: 0x%04x ref_tag: %u\n", |
6ae50408 NB |
1306 | (cmd->data_direction == DMA_TO_DEVICE) ? |
1307 | "WRITE" : "READ", (unsigned long long)sector, | |
1308 | sdt->guard_tag, sdt->app_tag, | |
1309 | be32_to_cpu(sdt->ref_tag)); | |
66a3d5bc NB |
1310 | |
1311 | sector++; | |
66a3d5bc NB |
1312 | } |
1313 | ||
18213afb AM |
1314 | kunmap_atomic(daddr - dsg->offset); |
1315 | kunmap_atomic(paddr - psg->offset); | |
66a3d5bc NB |
1316 | } |
1317 | } | |
1318 | ||
41861fa8 | 1319 | static sense_reason_t |
fe052a18 | 1320 | sbc_dif_v1_verify(struct se_cmd *cmd, struct t10_pi_tuple *sdt, |
18213afb | 1321 | __u16 crc, sector_t sector, unsigned int ei_lba) |
41861fa8 | 1322 | { |
41861fa8 NB |
1323 | __be16 csum; |
1324 | ||
d7a463b0 NB |
1325 | if (!(cmd->prot_checks & TARGET_DIF_CHECK_GUARD)) |
1326 | goto check_ref; | |
1327 | ||
18213afb | 1328 | csum = cpu_to_be16(crc); |
41861fa8 NB |
1329 | |
1330 | if (sdt->guard_tag != csum) { | |
1331 | pr_err("DIFv1 checksum failed on sector %llu guard tag 0x%04x" | |
1332 | " csum 0x%04x\n", (unsigned long long)sector, | |
1333 | be16_to_cpu(sdt->guard_tag), be16_to_cpu(csum)); | |
1334 | return TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED; | |
1335 | } | |
1336 | ||
d7a463b0 NB |
1337 | check_ref: |
1338 | if (!(cmd->prot_checks & TARGET_DIF_CHECK_REFTAG)) | |
1339 | return 0; | |
1340 | ||
823ddd87 | 1341 | if (cmd->prot_type == TARGET_DIF_TYPE1_PROT && |
41861fa8 NB |
1342 | be32_to_cpu(sdt->ref_tag) != (sector & 0xffffffff)) { |
1343 | pr_err("DIFv1 Type 1 reference failed on sector: %llu tag: 0x%08x" | |
1344 | " sector MSB: 0x%08x\n", (unsigned long long)sector, | |
1345 | be32_to_cpu(sdt->ref_tag), (u32)(sector & 0xffffffff)); | |
1346 | return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED; | |
1347 | } | |
1348 | ||
823ddd87 | 1349 | if (cmd->prot_type == TARGET_DIF_TYPE2_PROT && |
41861fa8 NB |
1350 | be32_to_cpu(sdt->ref_tag) != ei_lba) { |
1351 | pr_err("DIFv1 Type 2 reference failed on sector: %llu tag: 0x%08x" | |
1352 | " ei_lba: 0x%08x\n", (unsigned long long)sector, | |
1353 | be32_to_cpu(sdt->ref_tag), ei_lba); | |
1354 | return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED; | |
1355 | } | |
1356 | ||
1357 | return 0; | |
1358 | } | |
1359 | ||
f75b6fae SG |
1360 | void sbc_dif_copy_prot(struct se_cmd *cmd, unsigned int sectors, bool read, |
1361 | struct scatterlist *sg, int sg_off) | |
41861fa8 NB |
1362 | { |
1363 | struct se_device *dev = cmd->se_dev; | |
1364 | struct scatterlist *psg; | |
1365 | void *paddr, *addr; | |
1366 | unsigned int i, len, left; | |
10762e80 | 1367 | unsigned int offset = sg_off; |
41861fa8 | 1368 | |
38b57f82 NB |
1369 | if (!sg) |
1370 | return; | |
1371 | ||
41861fa8 NB |
1372 | left = sectors * dev->prot_length; |
1373 | ||
1374 | for_each_sg(cmd->t_prot_sg, psg, cmd->t_prot_nents, i) { | |
16c0ae02 | 1375 | unsigned int psg_len, copied = 0; |
d6a65fdc | 1376 | |
41861fa8 | 1377 | paddr = kmap_atomic(sg_page(psg)) + psg->offset; |
16c0ae02 SG |
1378 | psg_len = min(left, psg->length); |
1379 | while (psg_len) { | |
1380 | len = min(psg_len, sg->length - offset); | |
1381 | addr = kmap_atomic(sg_page(sg)) + sg->offset + offset; | |
1382 | ||
1383 | if (read) | |
1384 | memcpy(paddr + copied, addr, len); | |
1385 | else | |
1386 | memcpy(addr, paddr + copied, len); | |
1387 | ||
1388 | left -= len; | |
1389 | offset += len; | |
1390 | copied += len; | |
1391 | psg_len -= len; | |
1392 | ||
57636388 AM |
1393 | kunmap_atomic(addr - sg->offset - offset); |
1394 | ||
16c0ae02 SG |
1395 | if (offset >= sg->length) { |
1396 | sg = sg_next(sg); | |
1397 | offset = 0; | |
1398 | } | |
16c0ae02 | 1399 | } |
57636388 | 1400 | kunmap_atomic(paddr - psg->offset); |
41861fa8 NB |
1401 | } |
1402 | } | |
f75b6fae | 1403 | EXPORT_SYMBOL(sbc_dif_copy_prot); |
41861fa8 NB |
1404 | |
1405 | sense_reason_t | |
f75b6fae | 1406 | sbc_dif_verify(struct se_cmd *cmd, sector_t start, unsigned int sectors, |
414e4627 | 1407 | unsigned int ei_lba, struct scatterlist *psg, int psg_off) |
41861fa8 NB |
1408 | { |
1409 | struct se_device *dev = cmd->se_dev; | |
fe052a18 | 1410 | struct t10_pi_tuple *sdt; |
18213afb | 1411 | struct scatterlist *dsg = cmd->t_data_sg; |
41861fa8 NB |
1412 | sector_t sector = start; |
1413 | void *daddr, *paddr; | |
18213afb | 1414 | int i; |
41861fa8 | 1415 | sense_reason_t rc; |
18213afb AM |
1416 | int dsg_off = 0; |
1417 | unsigned int block_size = dev->dev_attrib.block_size; | |
41861fa8 | 1418 | |
18213afb | 1419 | for (; psg && sector < start + sectors; psg = sg_next(psg)) { |
41861fa8 | 1420 | paddr = kmap_atomic(sg_page(psg)) + psg->offset; |
41861fa8 | 1421 | daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; |
41861fa8 | 1422 | |
18213afb AM |
1423 | for (i = psg_off; i < psg->length && |
1424 | sector < start + sectors; | |
fe052a18 | 1425 | i += sizeof(*sdt)) { |
18213afb AM |
1426 | __u16 crc; |
1427 | unsigned int avail; | |
41861fa8 | 1428 | |
18213afb AM |
1429 | if (dsg_off >= dsg->length) { |
1430 | dsg_off -= dsg->length; | |
1431 | kunmap_atomic(daddr - dsg->offset); | |
1432 | dsg = sg_next(dsg); | |
1433 | if (!dsg) { | |
1434 | kunmap_atomic(paddr - psg->offset); | |
1435 | return 0; | |
1436 | } | |
1437 | daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; | |
41861fa8 NB |
1438 | } |
1439 | ||
18213afb | 1440 | sdt = paddr + i; |
41861fa8 NB |
1441 | |
1442 | pr_debug("DIF READ sector: %llu guard_tag: 0x%04x" | |
1443 | " app_tag: 0x%04x ref_tag: %u\n", | |
1444 | (unsigned long long)sector, sdt->guard_tag, | |
1445 | sdt->app_tag, be32_to_cpu(sdt->ref_tag)); | |
1446 | ||
128b6f9f | 1447 | if (sdt->app_tag == T10_PI_APP_ESCAPE) { |
18213afb AM |
1448 | dsg_off += block_size; |
1449 | goto next; | |
1450 | } | |
1451 | ||
1452 | avail = min(block_size, dsg->length - dsg_off); | |
1453 | crc = crc_t10dif(daddr + dsg_off, avail); | |
1454 | if (avail < block_size) { | |
1455 | kunmap_atomic(daddr - dsg->offset); | |
1456 | dsg = sg_next(dsg); | |
1457 | if (!dsg) { | |
1458 | kunmap_atomic(paddr - psg->offset); | |
1459 | return 0; | |
1460 | } | |
1461 | daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; | |
1462 | dsg_off = block_size - avail; | |
1463 | crc = crc_t10dif_update(crc, daddr, dsg_off); | |
1464 | } else { | |
1465 | dsg_off += block_size; | |
41861fa8 NB |
1466 | } |
1467 | ||
18213afb | 1468 | rc = sbc_dif_v1_verify(cmd, sdt, crc, sector, ei_lba); |
41861fa8 | 1469 | if (rc) { |
414e4627 | 1470 | kunmap_atomic(daddr - dsg->offset); |
18213afb | 1471 | kunmap_atomic(paddr - psg->offset); |
8dd992fb | 1472 | cmd->sense_info = sector; |
41861fa8 NB |
1473 | return rc; |
1474 | } | |
18213afb | 1475 | next: |
41861fa8 NB |
1476 | sector++; |
1477 | ei_lba++; | |
41861fa8 NB |
1478 | } |
1479 | ||
18213afb | 1480 | psg_off = 0; |
414e4627 | 1481 | kunmap_atomic(daddr - dsg->offset); |
18213afb | 1482 | kunmap_atomic(paddr - psg->offset); |
41861fa8 | 1483 | } |
41861fa8 NB |
1484 | |
1485 | return 0; | |
1486 | } | |
f75b6fae | 1487 | EXPORT_SYMBOL(sbc_dif_verify); |