Commit | Line | Data |
---|---|---|
d6e0175c CH |
1 | /* |
2 | * SCSI Block Commands (SBC) parsing and emulation. | |
3 | * | |
4c76251e | 4 | * (c) Copyright 2002-2013 Datera, Inc. |
d6e0175c CH |
5 | * |
6 | * Nicholas A. Bellinger <nab@kernel.org> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2 of the License, or | |
11 | * (at your option) any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
21 | */ | |
22 | ||
23 | #include <linux/kernel.h> | |
24 | #include <linux/module.h> | |
25 | #include <linux/ratelimit.h> | |
41861fa8 | 26 | #include <linux/crc-t10dif.h> |
d6e0175c | 27 | #include <asm/unaligned.h> |
ba929992 | 28 | #include <scsi/scsi_proto.h> |
68ff9b9b | 29 | #include <scsi/scsi_tcq.h> |
d6e0175c CH |
30 | |
31 | #include <target/target_core_base.h> | |
32 | #include <target/target_core_backend.h> | |
33 | #include <target/target_core_fabric.h> | |
34 | ||
35 | #include "target_core_internal.h" | |
36 | #include "target_core_ua.h" | |
c66094bf | 37 | #include "target_core_alua.h" |
d6e0175c | 38 | |
afd73f1b NB |
39 | static sense_reason_t |
40 | sbc_check_prot(struct se_device *, struct se_cmd *, unsigned char *, u32, bool); | |
62e46942 | 41 | static sense_reason_t sbc_execute_unmap(struct se_cmd *cmd); |
afd73f1b | 42 | |
de103c93 CH |
43 | static sense_reason_t |
44 | sbc_emulate_readcapacity(struct se_cmd *cmd) | |
1fd032ee CH |
45 | { |
46 | struct se_device *dev = cmd->se_dev; | |
8dc8632a | 47 | unsigned char *cdb = cmd->t_task_cdb; |
1fd032ee | 48 | unsigned long long blocks_long = dev->transport->get_blocks(dev); |
a50da144 PB |
49 | unsigned char *rbuf; |
50 | unsigned char buf[8]; | |
1fd032ee CH |
51 | u32 blocks; |
52 | ||
8dc8632a RD |
53 | /* |
54 | * SBC-2 says: | |
55 | * If the PMI bit is set to zero and the LOGICAL BLOCK | |
56 | * ADDRESS field is not set to zero, the device server shall | |
57 | * terminate the command with CHECK CONDITION status with | |
58 | * the sense key set to ILLEGAL REQUEST and the additional | |
59 | * sense code set to INVALID FIELD IN CDB. | |
60 | * | |
61 | * In SBC-3, these fields are obsolete, but some SCSI | |
62 | * compliance tests actually check this, so we might as well | |
63 | * follow SBC-2. | |
64 | */ | |
65 | if (!(cdb[8] & 1) && !!(cdb[2] | cdb[3] | cdb[4] | cdb[5])) | |
66 | return TCM_INVALID_CDB_FIELD; | |
67 | ||
1fd032ee CH |
68 | if (blocks_long >= 0x00000000ffffffff) |
69 | blocks = 0xffffffff; | |
70 | else | |
71 | blocks = (u32)blocks_long; | |
72 | ||
1fd032ee CH |
73 | buf[0] = (blocks >> 24) & 0xff; |
74 | buf[1] = (blocks >> 16) & 0xff; | |
75 | buf[2] = (blocks >> 8) & 0xff; | |
76 | buf[3] = blocks & 0xff; | |
0fd97ccf CH |
77 | buf[4] = (dev->dev_attrib.block_size >> 24) & 0xff; |
78 | buf[5] = (dev->dev_attrib.block_size >> 16) & 0xff; | |
79 | buf[6] = (dev->dev_attrib.block_size >> 8) & 0xff; | |
80 | buf[7] = dev->dev_attrib.block_size & 0xff; | |
1fd032ee | 81 | |
a50da144 | 82 | rbuf = transport_kmap_data_sg(cmd); |
8b4b0dcb NB |
83 | if (rbuf) { |
84 | memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length)); | |
85 | transport_kunmap_data_sg(cmd); | |
86 | } | |
1fd032ee | 87 | |
2426bd45 | 88 | target_complete_cmd_with_length(cmd, GOOD, 8); |
1fd032ee CH |
89 | return 0; |
90 | } | |
91 | ||
de103c93 CH |
92 | static sense_reason_t |
93 | sbc_emulate_readcapacity_16(struct se_cmd *cmd) | |
1fd032ee CH |
94 | { |
95 | struct se_device *dev = cmd->se_dev; | |
2d335983 | 96 | struct se_session *sess = cmd->se_sess; |
9ef5466e NB |
97 | int pi_prot_type = dev->dev_attrib.pi_prot_type; |
98 | ||
a50da144 PB |
99 | unsigned char *rbuf; |
100 | unsigned char buf[32]; | |
1fd032ee CH |
101 | unsigned long long blocks = dev->transport->get_blocks(dev); |
102 | ||
a50da144 | 103 | memset(buf, 0, sizeof(buf)); |
1fd032ee CH |
104 | buf[0] = (blocks >> 56) & 0xff; |
105 | buf[1] = (blocks >> 48) & 0xff; | |
106 | buf[2] = (blocks >> 40) & 0xff; | |
107 | buf[3] = (blocks >> 32) & 0xff; | |
108 | buf[4] = (blocks >> 24) & 0xff; | |
109 | buf[5] = (blocks >> 16) & 0xff; | |
110 | buf[6] = (blocks >> 8) & 0xff; | |
111 | buf[7] = blocks & 0xff; | |
0fd97ccf CH |
112 | buf[8] = (dev->dev_attrib.block_size >> 24) & 0xff; |
113 | buf[9] = (dev->dev_attrib.block_size >> 16) & 0xff; | |
114 | buf[10] = (dev->dev_attrib.block_size >> 8) & 0xff; | |
115 | buf[11] = dev->dev_attrib.block_size & 0xff; | |
56dac14c NB |
116 | /* |
117 | * Set P_TYPE and PROT_EN bits for DIF support | |
118 | */ | |
2d335983 | 119 | if (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) { |
9ef5466e NB |
120 | /* |
121 | * Only override a device's pi_prot_type if no T10-PI is | |
122 | * available, and sess_prot_type has been explicitly enabled. | |
123 | */ | |
124 | if (!pi_prot_type) | |
125 | pi_prot_type = sess->sess_prot_type; | |
126 | ||
127 | if (pi_prot_type) | |
128 | buf[12] = (pi_prot_type - 1) << 1 | 0x1; | |
2d335983 | 129 | } |
7f7caf6a AG |
130 | |
131 | if (dev->transport->get_lbppbe) | |
132 | buf[13] = dev->transport->get_lbppbe(dev) & 0x0f; | |
133 | ||
134 | if (dev->transport->get_alignment_offset_lbas) { | |
135 | u16 lalba = dev->transport->get_alignment_offset_lbas(dev); | |
136 | buf[14] = (lalba >> 8) & 0x3f; | |
137 | buf[15] = lalba & 0xff; | |
138 | } | |
139 | ||
1fd032ee CH |
140 | /* |
141 | * Set Thin Provisioning Enable bit following sbc3r22 in section | |
142 | * READ CAPACITY (16) byte 14 if emulate_tpu or emulate_tpws is enabled. | |
143 | */ | |
e6f41633 | 144 | if (dev->dev_attrib.emulate_tpu || dev->dev_attrib.emulate_tpws) { |
7f7caf6a | 145 | buf[14] |= 0x80; |
1fd032ee | 146 | |
e6f41633 JP |
147 | /* |
148 | * LBPRZ signifies that zeroes will be read back from an LBA after | |
149 | * an UNMAP or WRITE SAME w/ unmap bit (sbc3r36 5.16.2) | |
150 | */ | |
151 | if (dev->dev_attrib.unmap_zeroes_data) | |
152 | buf[14] |= 0x40; | |
153 | } | |
154 | ||
a50da144 | 155 | rbuf = transport_kmap_data_sg(cmd); |
8b4b0dcb NB |
156 | if (rbuf) { |
157 | memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length)); | |
158 | transport_kunmap_data_sg(cmd); | |
159 | } | |
1fd032ee | 160 | |
2426bd45 | 161 | target_complete_cmd_with_length(cmd, GOOD, 32); |
1fd032ee CH |
162 | return 0; |
163 | } | |
164 | ||
45182ed5 BB |
165 | static sense_reason_t |
166 | sbc_emulate_startstop(struct se_cmd *cmd) | |
167 | { | |
168 | unsigned char *cdb = cmd->t_task_cdb; | |
169 | ||
170 | /* | |
171 | * See sbc3r36 section 5.25 | |
172 | * Immediate bit should be set since there is nothing to complete | |
173 | * POWER CONDITION MODIFIER 0h | |
174 | */ | |
175 | if (!(cdb[1] & 1) || cdb[2] || cdb[3]) | |
176 | return TCM_INVALID_CDB_FIELD; | |
177 | ||
178 | /* | |
179 | * See sbc3r36 section 5.25 | |
180 | * POWER CONDITION 0h START_VALID - process START and LOEJ | |
181 | */ | |
182 | if (cdb[4] >> 4 & 0xf) | |
183 | return TCM_INVALID_CDB_FIELD; | |
184 | ||
185 | /* | |
186 | * See sbc3r36 section 5.25 | |
187 | * LOEJ 0h - nothing to load or unload | |
188 | * START 1h - we are ready | |
189 | */ | |
190 | if (!(cdb[4] & 1) || (cdb[4] & 2) || (cdb[4] & 4)) | |
191 | return TCM_INVALID_CDB_FIELD; | |
192 | ||
193 | target_complete_cmd(cmd, SAM_STAT_GOOD); | |
194 | return 0; | |
195 | } | |
196 | ||
972b29c8 | 197 | sector_t sbc_get_write_same_sectors(struct se_cmd *cmd) |
1fd032ee | 198 | { |
1fd032ee | 199 | u32 num_blocks; |
1fd032ee CH |
200 | |
201 | if (cmd->t_task_cdb[0] == WRITE_SAME) | |
202 | num_blocks = get_unaligned_be16(&cmd->t_task_cdb[7]); | |
203 | else if (cmd->t_task_cdb[0] == WRITE_SAME_16) | |
204 | num_blocks = get_unaligned_be32(&cmd->t_task_cdb[10]); | |
205 | else /* WRITE_SAME_32 via VARIABLE_LENGTH_CMD */ | |
206 | num_blocks = get_unaligned_be32(&cmd->t_task_cdb[28]); | |
207 | ||
208 | /* | |
209 | * Use the explicit range when non zero is supplied, otherwise calculate | |
210 | * the remaining range based on ->get_blocks() - starting LBA. | |
211 | */ | |
6f974e8c CH |
212 | if (num_blocks) |
213 | return num_blocks; | |
1fd032ee | 214 | |
6f974e8c CH |
215 | return cmd->se_dev->transport->get_blocks(cmd->se_dev) - |
216 | cmd->t_task_lba + 1; | |
1fd032ee | 217 | } |
972b29c8 | 218 | EXPORT_SYMBOL(sbc_get_write_same_sectors); |
1fd032ee | 219 | |
b753d643 CH |
220 | static sense_reason_t |
221 | sbc_execute_write_same_unmap(struct se_cmd *cmd) | |
222 | { | |
223 | struct sbc_ops *ops = cmd->protocol_data; | |
224 | sector_t nolb = sbc_get_write_same_sectors(cmd); | |
225 | sense_reason_t ret; | |
226 | ||
227 | if (nolb) { | |
228 | ret = ops->execute_unmap(cmd, cmd->t_task_lba, nolb); | |
229 | if (ret) | |
230 | return ret; | |
231 | } | |
232 | ||
233 | target_complete_cmd(cmd, GOOD); | |
234 | return 0; | |
235 | } | |
236 | ||
de103c93 | 237 | static sense_reason_t |
1920ed61 | 238 | sbc_emulate_noop(struct se_cmd *cmd) |
1a1ff38c BK |
239 | { |
240 | target_complete_cmd(cmd, GOOD); | |
241 | return 0; | |
242 | } | |
243 | ||
d6e0175c CH |
244 | static inline u32 sbc_get_size(struct se_cmd *cmd, u32 sectors) |
245 | { | |
0fd97ccf | 246 | return cmd->se_dev->dev_attrib.block_size * sectors; |
d6e0175c CH |
247 | } |
248 | ||
d6e0175c CH |
249 | static inline u32 transport_get_sectors_6(unsigned char *cdb) |
250 | { | |
251 | /* | |
252 | * Use 8-bit sector value. SBC-3 says: | |
253 | * | |
254 | * A TRANSFER LENGTH field set to zero specifies that 256 | |
255 | * logical blocks shall be written. Any other value | |
256 | * specifies the number of logical blocks that shall be | |
257 | * written. | |
258 | */ | |
259 | return cdb[4] ? : 256; | |
260 | } | |
261 | ||
262 | static inline u32 transport_get_sectors_10(unsigned char *cdb) | |
263 | { | |
264 | return (u32)(cdb[7] << 8) + cdb[8]; | |
265 | } | |
266 | ||
267 | static inline u32 transport_get_sectors_12(unsigned char *cdb) | |
268 | { | |
269 | return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9]; | |
270 | } | |
271 | ||
272 | static inline u32 transport_get_sectors_16(unsigned char *cdb) | |
273 | { | |
274 | return (u32)(cdb[10] << 24) + (cdb[11] << 16) + | |
275 | (cdb[12] << 8) + cdb[13]; | |
276 | } | |
277 | ||
278 | /* | |
279 | * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants | |
280 | */ | |
281 | static inline u32 transport_get_sectors_32(unsigned char *cdb) | |
282 | { | |
283 | return (u32)(cdb[28] << 24) + (cdb[29] << 16) + | |
284 | (cdb[30] << 8) + cdb[31]; | |
285 | ||
286 | } | |
287 | ||
288 | static inline u32 transport_lba_21(unsigned char *cdb) | |
289 | { | |
290 | return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3]; | |
291 | } | |
292 | ||
293 | static inline u32 transport_lba_32(unsigned char *cdb) | |
294 | { | |
295 | return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5]; | |
296 | } | |
297 | ||
298 | static inline unsigned long long transport_lba_64(unsigned char *cdb) | |
299 | { | |
300 | unsigned int __v1, __v2; | |
301 | ||
302 | __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5]; | |
303 | __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9]; | |
304 | ||
305 | return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; | |
306 | } | |
307 | ||
308 | /* | |
309 | * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs | |
310 | */ | |
311 | static inline unsigned long long transport_lba_64_ext(unsigned char *cdb) | |
312 | { | |
313 | unsigned int __v1, __v2; | |
314 | ||
315 | __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15]; | |
316 | __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19]; | |
317 | ||
318 | return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; | |
319 | } | |
320 | ||
cd063bef NB |
321 | static sense_reason_t |
322 | sbc_setup_write_same(struct se_cmd *cmd, unsigned char *flags, struct sbc_ops *ops) | |
d6e0175c | 323 | { |
8e575c50 NB |
324 | struct se_device *dev = cmd->se_dev; |
325 | sector_t end_lba = dev->transport->get_blocks(dev) + 1; | |
972b29c8 | 326 | unsigned int sectors = sbc_get_write_same_sectors(cmd); |
afd73f1b | 327 | sense_reason_t ret; |
773cbaf7 | 328 | |
d6e0175c CH |
329 | if ((flags[0] & 0x04) || (flags[0] & 0x02)) { |
330 | pr_err("WRITE_SAME PBDATA and LBDATA" | |
331 | " bits not supported for Block Discard" | |
332 | " Emulation\n"); | |
cd063bef | 333 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
d6e0175c | 334 | } |
773cbaf7 NB |
335 | if (sectors > cmd->se_dev->dev_attrib.max_write_same_len) { |
336 | pr_warn("WRITE_SAME sectors: %u exceeds max_write_same_len: %u\n", | |
337 | sectors, cmd->se_dev->dev_attrib.max_write_same_len); | |
338 | return TCM_INVALID_CDB_FIELD; | |
339 | } | |
8e575c50 NB |
340 | /* |
341 | * Sanity check for LBA wrap and request past end of device. | |
342 | */ | |
343 | if (((cmd->t_task_lba + sectors) < cmd->t_task_lba) || | |
344 | ((cmd->t_task_lba + sectors) > end_lba)) { | |
345 | pr_err("WRITE_SAME exceeds last lba %llu (lba %llu, sectors %u)\n", | |
346 | (unsigned long long)end_lba, cmd->t_task_lba, sectors); | |
347 | return TCM_ADDRESS_OUT_OF_RANGE; | |
348 | } | |
349 | ||
5cb770bf RD |
350 | /* We always have ANC_SUP == 0 so setting ANCHOR is always an error */ |
351 | if (flags[0] & 0x10) { | |
352 | pr_warn("WRITE SAME with ANCHOR not supported\n"); | |
353 | return TCM_INVALID_CDB_FIELD; | |
354 | } | |
d6e0175c | 355 | /* |
cd063bef NB |
356 | * Special case for WRITE_SAME w/ UNMAP=1 that ends up getting |
357 | * translated into block discard requests within backend code. | |
d6e0175c | 358 | */ |
cd063bef | 359 | if (flags[0] & 0x08) { |
b753d643 | 360 | if (!ops->execute_unmap) |
cd063bef NB |
361 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
362 | ||
d0a91295 NB |
363 | if (!dev->dev_attrib.emulate_tpws) { |
364 | pr_err("Got WRITE_SAME w/ UNMAP=1, but backend device" | |
365 | " has emulate_tpws disabled\n"); | |
366 | return TCM_UNSUPPORTED_SCSI_OPCODE; | |
367 | } | |
b753d643 | 368 | cmd->execute_cmd = sbc_execute_write_same_unmap; |
cd063bef | 369 | return 0; |
d6e0175c | 370 | } |
cd063bef NB |
371 | if (!ops->execute_write_same) |
372 | return TCM_UNSUPPORTED_SCSI_OPCODE; | |
d6e0175c | 373 | |
afd73f1b NB |
374 | ret = sbc_check_prot(dev, cmd, &cmd->t_task_cdb[0], sectors, true); |
375 | if (ret) | |
376 | return ret; | |
377 | ||
cd063bef | 378 | cmd->execute_cmd = ops->execute_write_same; |
d6e0175c CH |
379 | return 0; |
380 | } | |
381 | ||
057085e5 NB |
382 | static sense_reason_t xdreadwrite_callback(struct se_cmd *cmd, bool success, |
383 | int *post_ret) | |
d6e0175c CH |
384 | { |
385 | unsigned char *buf, *addr; | |
386 | struct scatterlist *sg; | |
387 | unsigned int offset; | |
a6b0133c NB |
388 | sense_reason_t ret = TCM_NO_SENSE; |
389 | int i, count; | |
d6e0175c CH |
390 | /* |
391 | * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command | |
392 | * | |
393 | * 1) read the specified logical block(s); | |
394 | * 2) transfer logical blocks from the data-out buffer; | |
395 | * 3) XOR the logical blocks transferred from the data-out buffer with | |
396 | * the logical blocks read, storing the resulting XOR data in a buffer; | |
397 | * 4) if the DISABLE WRITE bit is set to zero, then write the logical | |
398 | * blocks transferred from the data-out buffer; and | |
399 | * 5) transfer the resulting XOR data to the data-in buffer. | |
400 | */ | |
401 | buf = kmalloc(cmd->data_length, GFP_KERNEL); | |
402 | if (!buf) { | |
403 | pr_err("Unable to allocate xor_callback buf\n"); | |
a6b0133c | 404 | return TCM_OUT_OF_RESOURCES; |
d6e0175c CH |
405 | } |
406 | /* | |
407 | * Copy the scatterlist WRITE buffer located at cmd->t_data_sg | |
408 | * into the locally allocated *buf | |
409 | */ | |
410 | sg_copy_to_buffer(cmd->t_data_sg, | |
411 | cmd->t_data_nents, | |
412 | buf, | |
413 | cmd->data_length); | |
414 | ||
415 | /* | |
416 | * Now perform the XOR against the BIDI read memory located at | |
417 | * cmd->t_mem_bidi_list | |
418 | */ | |
419 | ||
420 | offset = 0; | |
421 | for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) { | |
422 | addr = kmap_atomic(sg_page(sg)); | |
a6b0133c NB |
423 | if (!addr) { |
424 | ret = TCM_OUT_OF_RESOURCES; | |
d6e0175c | 425 | goto out; |
a6b0133c | 426 | } |
d6e0175c CH |
427 | |
428 | for (i = 0; i < sg->length; i++) | |
429 | *(addr + sg->offset + i) ^= *(buf + offset + i); | |
430 | ||
431 | offset += sg->length; | |
432 | kunmap_atomic(addr); | |
433 | } | |
434 | ||
435 | out: | |
436 | kfree(buf); | |
a6b0133c | 437 | return ret; |
d6e0175c CH |
438 | } |
439 | ||
a82a9538 NB |
440 | static sense_reason_t |
441 | sbc_execute_rw(struct se_cmd *cmd) | |
442 | { | |
7a971b1b CH |
443 | struct sbc_ops *ops = cmd->protocol_data; |
444 | ||
445 | return ops->execute_rw(cmd, cmd->t_data_sg, cmd->t_data_nents, | |
a82a9538 NB |
446 | cmd->data_direction); |
447 | } | |
448 | ||
057085e5 NB |
449 | static sense_reason_t compare_and_write_post(struct se_cmd *cmd, bool success, |
450 | int *post_ret) | |
68ff9b9b NB |
451 | { |
452 | struct se_device *dev = cmd->se_dev; | |
453 | ||
d8855c15 NB |
454 | /* |
455 | * Only set SCF_COMPARE_AND_WRITE_POST to force a response fall-through | |
456 | * within target_complete_ok_work() if the command was successfully | |
457 | * sent to the backend driver. | |
458 | */ | |
459 | spin_lock_irq(&cmd->t_state_lock); | |
057085e5 | 460 | if ((cmd->transport_state & CMD_T_SENT) && !cmd->scsi_status) { |
d8855c15 | 461 | cmd->se_cmd_flags |= SCF_COMPARE_AND_WRITE_POST; |
057085e5 NB |
462 | *post_ret = 1; |
463 | } | |
d8855c15 NB |
464 | spin_unlock_irq(&cmd->t_state_lock); |
465 | ||
68ff9b9b NB |
466 | /* |
467 | * Unlock ->caw_sem originally obtained during sbc_compare_and_write() | |
468 | * before the original READ I/O submission. | |
469 | */ | |
470 | up(&dev->caw_sem); | |
471 | ||
472 | return TCM_NO_SENSE; | |
473 | } | |
474 | ||
057085e5 NB |
475 | static sense_reason_t compare_and_write_callback(struct se_cmd *cmd, bool success, |
476 | int *post_ret) | |
68ff9b9b NB |
477 | { |
478 | struct se_device *dev = cmd->se_dev; | |
479 | struct scatterlist *write_sg = NULL, *sg; | |
db60df88 | 480 | unsigned char *buf = NULL, *addr; |
68ff9b9b NB |
481 | struct sg_mapping_iter m; |
482 | unsigned int offset = 0, len; | |
483 | unsigned int nlbas = cmd->t_task_nolb; | |
484 | unsigned int block_size = dev->dev_attrib.block_size; | |
485 | unsigned int compare_len = (nlbas * block_size); | |
486 | sense_reason_t ret = TCM_NO_SENSE; | |
487 | int rc, i; | |
488 | ||
cf6d1f09 NB |
489 | /* |
490 | * Handle early failure in transport_generic_request_failure(), | |
c8e63985 | 491 | * which will not have taken ->caw_sem yet.. |
cf6d1f09 | 492 | */ |
c8e63985 | 493 | if (!success && (!cmd->t_data_sg || !cmd->t_bidi_data_sg)) |
cf6d1f09 | 494 | return TCM_NO_SENSE; |
c8e63985 NB |
495 | /* |
496 | * Handle special case for zero-length COMPARE_AND_WRITE | |
497 | */ | |
498 | if (!cmd->data_length) | |
499 | goto out; | |
db60df88 NB |
500 | /* |
501 | * Immediately exit + release dev->caw_sem if command has already | |
502 | * been failed with a non-zero SCSI status. | |
503 | */ | |
504 | if (cmd->scsi_status) { | |
505 | pr_err("compare_and_write_callback: non zero scsi_status:" | |
506 | " 0x%02x\n", cmd->scsi_status); | |
507 | goto out; | |
508 | } | |
cf6d1f09 | 509 | |
68ff9b9b NB |
510 | buf = kzalloc(cmd->data_length, GFP_KERNEL); |
511 | if (!buf) { | |
512 | pr_err("Unable to allocate compare_and_write buf\n"); | |
a2890087 NB |
513 | ret = TCM_OUT_OF_RESOURCES; |
514 | goto out; | |
68ff9b9b NB |
515 | } |
516 | ||
a1e1774c | 517 | write_sg = kmalloc(sizeof(struct scatterlist) * cmd->t_data_nents, |
68ff9b9b NB |
518 | GFP_KERNEL); |
519 | if (!write_sg) { | |
520 | pr_err("Unable to allocate compare_and_write sg\n"); | |
521 | ret = TCM_OUT_OF_RESOURCES; | |
522 | goto out; | |
523 | } | |
a1e1774c | 524 | sg_init_table(write_sg, cmd->t_data_nents); |
68ff9b9b NB |
525 | /* |
526 | * Setup verify and write data payloads from total NumberLBAs. | |
527 | */ | |
528 | rc = sg_copy_to_buffer(cmd->t_data_sg, cmd->t_data_nents, buf, | |
529 | cmd->data_length); | |
530 | if (!rc) { | |
531 | pr_err("sg_copy_to_buffer() failed for compare_and_write\n"); | |
532 | ret = TCM_OUT_OF_RESOURCES; | |
533 | goto out; | |
534 | } | |
535 | /* | |
536 | * Compare against SCSI READ payload against verify payload | |
537 | */ | |
538 | for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, i) { | |
539 | addr = (unsigned char *)kmap_atomic(sg_page(sg)); | |
540 | if (!addr) { | |
541 | ret = TCM_OUT_OF_RESOURCES; | |
542 | goto out; | |
543 | } | |
544 | ||
545 | len = min(sg->length, compare_len); | |
546 | ||
547 | if (memcmp(addr, buf + offset, len)) { | |
548 | pr_warn("Detected MISCOMPARE for addr: %p buf: %p\n", | |
549 | addr, buf + offset); | |
550 | kunmap_atomic(addr); | |
551 | goto miscompare; | |
552 | } | |
553 | kunmap_atomic(addr); | |
554 | ||
555 | offset += len; | |
556 | compare_len -= len; | |
557 | if (!compare_len) | |
558 | break; | |
559 | } | |
560 | ||
561 | i = 0; | |
562 | len = cmd->t_task_nolb * block_size; | |
563 | sg_miter_start(&m, cmd->t_data_sg, cmd->t_data_nents, SG_MITER_TO_SG); | |
564 | /* | |
565 | * Currently assumes NoLB=1 and SGLs are PAGE_SIZE.. | |
566 | */ | |
567 | while (len) { | |
568 | sg_miter_next(&m); | |
569 | ||
570 | if (block_size < PAGE_SIZE) { | |
571 | sg_set_page(&write_sg[i], m.page, block_size, | |
d94e5a61 | 572 | m.piter.sg->offset + block_size); |
68ff9b9b NB |
573 | } else { |
574 | sg_miter_next(&m); | |
575 | sg_set_page(&write_sg[i], m.page, block_size, | |
d94e5a61 | 576 | m.piter.sg->offset); |
68ff9b9b NB |
577 | } |
578 | len -= block_size; | |
579 | i++; | |
580 | } | |
581 | sg_miter_stop(&m); | |
582 | /* | |
583 | * Save the original SGL + nents values before updating to new | |
584 | * assignments, to be released in transport_free_pages() -> | |
585 | * transport_reset_sgl_orig() | |
586 | */ | |
587 | cmd->t_data_sg_orig = cmd->t_data_sg; | |
588 | cmd->t_data_sg = write_sg; | |
589 | cmd->t_data_nents_orig = cmd->t_data_nents; | |
590 | cmd->t_data_nents = 1; | |
591 | ||
68d81f40 | 592 | cmd->sam_task_attr = TCM_HEAD_TAG; |
68ff9b9b NB |
593 | cmd->transport_complete_callback = compare_and_write_post; |
594 | /* | |
595 | * Now reset ->execute_cmd() to the normal sbc_execute_rw() handler | |
596 | * for submitting the adjusted SGL to write instance user-data. | |
597 | */ | |
598 | cmd->execute_cmd = sbc_execute_rw; | |
599 | ||
600 | spin_lock_irq(&cmd->t_state_lock); | |
601 | cmd->t_state = TRANSPORT_PROCESSING; | |
602 | cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT; | |
603 | spin_unlock_irq(&cmd->t_state_lock); | |
604 | ||
605 | __target_execute_cmd(cmd); | |
606 | ||
607 | kfree(buf); | |
608 | return ret; | |
609 | ||
610 | miscompare: | |
611 | pr_warn("Target/%s: Send MISCOMPARE check condition and sense\n", | |
612 | dev->transport->name); | |
613 | ret = TCM_MISCOMPARE_VERIFY; | |
614 | out: | |
615 | /* | |
616 | * In the MISCOMPARE or failure case, unlock ->caw_sem obtained in | |
617 | * sbc_compare_and_write() before the original READ I/O submission. | |
618 | */ | |
619 | up(&dev->caw_sem); | |
620 | kfree(write_sg); | |
621 | kfree(buf); | |
622 | return ret; | |
623 | } | |
624 | ||
625 | static sense_reason_t | |
626 | sbc_compare_and_write(struct se_cmd *cmd) | |
627 | { | |
7a971b1b | 628 | struct sbc_ops *ops = cmd->protocol_data; |
68ff9b9b NB |
629 | struct se_device *dev = cmd->se_dev; |
630 | sense_reason_t ret; | |
631 | int rc; | |
632 | /* | |
633 | * Submit the READ first for COMPARE_AND_WRITE to perform the | |
634 | * comparision using SGLs at cmd->t_bidi_data_sg.. | |
635 | */ | |
636 | rc = down_interruptible(&dev->caw_sem); | |
ee7619f2 | 637 | if (rc != 0) { |
68ff9b9b NB |
638 | cmd->transport_complete_callback = NULL; |
639 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
640 | } | |
b7191253 NB |
641 | /* |
642 | * Reset cmd->data_length to individual block_size in order to not | |
643 | * confuse backend drivers that depend on this value matching the | |
644 | * size of the I/O being submitted. | |
645 | */ | |
646 | cmd->data_length = cmd->t_task_nolb * dev->dev_attrib.block_size; | |
68ff9b9b | 647 | |
7a971b1b | 648 | ret = ops->execute_rw(cmd, cmd->t_bidi_data_sg, cmd->t_bidi_data_nents, |
68ff9b9b NB |
649 | DMA_FROM_DEVICE); |
650 | if (ret) { | |
651 | cmd->transport_complete_callback = NULL; | |
652 | up(&dev->caw_sem); | |
653 | return ret; | |
654 | } | |
655 | /* | |
656 | * Unlock of dev->caw_sem to occur in compare_and_write_callback() | |
657 | * upon MISCOMPARE, or in compare_and_write_done() upon completion | |
658 | * of WRITE instance user-data. | |
659 | */ | |
660 | return TCM_NO_SENSE; | |
661 | } | |
662 | ||
19f9361a | 663 | static int |
38b57f82 | 664 | sbc_set_prot_op_checks(u8 protect, bool fabric_prot, enum target_prot_type prot_type, |
19f9361a SG |
665 | bool is_write, struct se_cmd *cmd) |
666 | { | |
667 | if (is_write) { | |
38b57f82 NB |
668 | cmd->prot_op = fabric_prot ? TARGET_PROT_DOUT_STRIP : |
669 | protect ? TARGET_PROT_DOUT_PASS : | |
670 | TARGET_PROT_DOUT_INSERT; | |
19f9361a SG |
671 | switch (protect) { |
672 | case 0x0: | |
673 | case 0x3: | |
674 | cmd->prot_checks = 0; | |
675 | break; | |
676 | case 0x1: | |
677 | case 0x5: | |
678 | cmd->prot_checks = TARGET_DIF_CHECK_GUARD; | |
679 | if (prot_type == TARGET_DIF_TYPE1_PROT) | |
680 | cmd->prot_checks |= TARGET_DIF_CHECK_REFTAG; | |
681 | break; | |
682 | case 0x2: | |
683 | if (prot_type == TARGET_DIF_TYPE1_PROT) | |
684 | cmd->prot_checks = TARGET_DIF_CHECK_REFTAG; | |
685 | break; | |
686 | case 0x4: | |
687 | cmd->prot_checks = TARGET_DIF_CHECK_GUARD; | |
688 | break; | |
689 | default: | |
690 | pr_err("Unsupported protect field %d\n", protect); | |
691 | return -EINVAL; | |
692 | } | |
693 | } else { | |
38b57f82 NB |
694 | cmd->prot_op = fabric_prot ? TARGET_PROT_DIN_INSERT : |
695 | protect ? TARGET_PROT_DIN_PASS : | |
696 | TARGET_PROT_DIN_STRIP; | |
19f9361a SG |
697 | switch (protect) { |
698 | case 0x0: | |
699 | case 0x1: | |
700 | case 0x5: | |
701 | cmd->prot_checks = TARGET_DIF_CHECK_GUARD; | |
702 | if (prot_type == TARGET_DIF_TYPE1_PROT) | |
703 | cmd->prot_checks |= TARGET_DIF_CHECK_REFTAG; | |
704 | break; | |
705 | case 0x2: | |
706 | if (prot_type == TARGET_DIF_TYPE1_PROT) | |
707 | cmd->prot_checks = TARGET_DIF_CHECK_REFTAG; | |
708 | break; | |
709 | case 0x3: | |
710 | cmd->prot_checks = 0; | |
711 | break; | |
712 | case 0x4: | |
713 | cmd->prot_checks = TARGET_DIF_CHECK_GUARD; | |
714 | break; | |
715 | default: | |
716 | pr_err("Unsupported protect field %d\n", protect); | |
717 | return -EINVAL; | |
718 | } | |
719 | } | |
720 | ||
721 | return 0; | |
722 | } | |
723 | ||
f7b7c06f | 724 | static sense_reason_t |
499bf77b | 725 | sbc_check_prot(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb, |
19f9361a | 726 | u32 sectors, bool is_write) |
499bf77b | 727 | { |
19f9361a | 728 | u8 protect = cdb[1] >> 5; |
38b57f82 NB |
729 | int sp_ops = cmd->se_sess->sup_prot_ops; |
730 | int pi_prot_type = dev->dev_attrib.pi_prot_type; | |
731 | bool fabric_prot = false; | |
19f9361a | 732 | |
f7b7c06f | 733 | if (!cmd->t_prot_sg || !cmd->t_prot_nents) { |
38b57f82 NB |
734 | if (unlikely(protect && |
735 | !dev->dev_attrib.pi_prot_type && !cmd->se_sess->sess_prot_type)) { | |
736 | pr_err("CDB contains protect bit, but device + fabric does" | |
737 | " not advertise PROTECT=1 feature bit\n"); | |
f7b7c06f NB |
738 | return TCM_INVALID_CDB_FIELD; |
739 | } | |
740 | if (cmd->prot_pto) | |
741 | return TCM_NO_SENSE; | |
742 | } | |
499bf77b NB |
743 | |
744 | switch (dev->dev_attrib.pi_prot_type) { | |
745 | case TARGET_DIF_TYPE3_PROT: | |
499bf77b NB |
746 | cmd->reftag_seed = 0xffffffff; |
747 | break; | |
748 | case TARGET_DIF_TYPE2_PROT: | |
19f9361a | 749 | if (protect) |
f7b7c06f | 750 | return TCM_INVALID_CDB_FIELD; |
499bf77b NB |
751 | |
752 | cmd->reftag_seed = cmd->t_task_lba; | |
753 | break; | |
754 | case TARGET_DIF_TYPE1_PROT: | |
499bf77b NB |
755 | cmd->reftag_seed = cmd->t_task_lba; |
756 | break; | |
757 | case TARGET_DIF_TYPE0_PROT: | |
38b57f82 NB |
758 | /* |
759 | * See if the fabric supports T10-PI, and the session has been | |
760 | * configured to allow export PROTECT=1 feature bit with backend | |
761 | * devices that don't support T10-PI. | |
762 | */ | |
763 | fabric_prot = is_write ? | |
764 | !!(sp_ops & (TARGET_PROT_DOUT_PASS | TARGET_PROT_DOUT_STRIP)) : | |
765 | !!(sp_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DIN_INSERT)); | |
766 | ||
767 | if (fabric_prot && cmd->se_sess->sess_prot_type) { | |
768 | pi_prot_type = cmd->se_sess->sess_prot_type; | |
769 | break; | |
770 | } | |
cceca4a6 NB |
771 | if (!protect) |
772 | return TCM_NO_SENSE; | |
38b57f82 | 773 | /* Fallthrough */ |
499bf77b | 774 | default: |
cceca4a6 NB |
775 | pr_err("Unable to determine pi_prot_type for CDB: 0x%02x " |
776 | "PROTECT: 0x%02x\n", cdb[0], protect); | |
777 | return TCM_INVALID_CDB_FIELD; | |
499bf77b NB |
778 | } |
779 | ||
38b57f82 | 780 | if (sbc_set_prot_op_checks(protect, fabric_prot, pi_prot_type, is_write, cmd)) |
f7b7c06f | 781 | return TCM_INVALID_CDB_FIELD; |
19f9361a | 782 | |
38b57f82 | 783 | cmd->prot_type = pi_prot_type; |
499bf77b | 784 | cmd->prot_length = dev->prot_length * sectors; |
e2a4f55c SG |
785 | |
786 | /** | |
787 | * In case protection information exists over the wire | |
788 | * we modify command data length to describe pure data. | |
789 | * The actual transfer length is data length + protection | |
790 | * length | |
791 | **/ | |
792 | if (protect) | |
793 | cmd->data_length = sectors * dev->dev_attrib.block_size; | |
794 | ||
795 | pr_debug("%s: prot_type=%d, data_length=%d, prot_length=%d " | |
796 | "prot_op=%d prot_checks=%d\n", | |
797 | __func__, cmd->prot_type, cmd->data_length, cmd->prot_length, | |
03abad9e | 798 | cmd->prot_op, cmd->prot_checks); |
499bf77b | 799 | |
f7b7c06f | 800 | return TCM_NO_SENSE; |
499bf77b NB |
801 | } |
802 | ||
fde9f50f NB |
803 | static int |
804 | sbc_check_dpofua(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb) | |
805 | { | |
806 | if (cdb[1] & 0x10) { | |
814e5b45 CH |
807 | /* see explanation in spc_emulate_modesense */ |
808 | if (!target_check_fua(dev)) { | |
fde9f50f NB |
809 | pr_err("Got CDB: 0x%02x with DPO bit set, but device" |
810 | " does not advertise support for DPO\n", cdb[0]); | |
811 | return -EINVAL; | |
812 | } | |
813 | } | |
814 | if (cdb[1] & 0x8) { | |
814e5b45 | 815 | if (!target_check_fua(dev)) { |
fde9f50f NB |
816 | pr_err("Got CDB: 0x%02x with FUA bit set, but device" |
817 | " does not advertise support for FUA write\n", | |
818 | cdb[0]); | |
819 | return -EINVAL; | |
820 | } | |
821 | cmd->se_cmd_flags |= SCF_FUA; | |
822 | } | |
823 | return 0; | |
499bf77b NB |
824 | } |
825 | ||
de103c93 CH |
826 | sense_reason_t |
827 | sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops) | |
d6e0175c | 828 | { |
d6e0175c CH |
829 | struct se_device *dev = cmd->se_dev; |
830 | unsigned char *cdb = cmd->t_task_cdb; | |
1fd032ee | 831 | unsigned int size; |
d6e0175c | 832 | u32 sectors = 0; |
de103c93 | 833 | sense_reason_t ret; |
d6e0175c | 834 | |
7a971b1b CH |
835 | cmd->protocol_data = ops; |
836 | ||
d6e0175c CH |
837 | switch (cdb[0]) { |
838 | case READ_6: | |
839 | sectors = transport_get_sectors_6(cdb); | |
840 | cmd->t_task_lba = transport_lba_21(cdb); | |
841 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
a82a9538 | 842 | cmd->execute_cmd = sbc_execute_rw; |
d6e0175c CH |
843 | break; |
844 | case READ_10: | |
845 | sectors = transport_get_sectors_10(cdb); | |
846 | cmd->t_task_lba = transport_lba_32(cdb); | |
499bf77b | 847 | |
fde9f50f NB |
848 | if (sbc_check_dpofua(dev, cmd, cdb)) |
849 | return TCM_INVALID_CDB_FIELD; | |
850 | ||
f7b7c06f NB |
851 | ret = sbc_check_prot(dev, cmd, cdb, sectors, false); |
852 | if (ret) | |
853 | return ret; | |
499bf77b | 854 | |
d6e0175c | 855 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
a82a9538 | 856 | cmd->execute_cmd = sbc_execute_rw; |
d6e0175c CH |
857 | break; |
858 | case READ_12: | |
859 | sectors = transport_get_sectors_12(cdb); | |
860 | cmd->t_task_lba = transport_lba_32(cdb); | |
499bf77b | 861 | |
fde9f50f NB |
862 | if (sbc_check_dpofua(dev, cmd, cdb)) |
863 | return TCM_INVALID_CDB_FIELD; | |
864 | ||
f7b7c06f NB |
865 | ret = sbc_check_prot(dev, cmd, cdb, sectors, false); |
866 | if (ret) | |
867 | return ret; | |
499bf77b | 868 | |
d6e0175c | 869 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
a82a9538 | 870 | cmd->execute_cmd = sbc_execute_rw; |
d6e0175c CH |
871 | break; |
872 | case READ_16: | |
873 | sectors = transport_get_sectors_16(cdb); | |
874 | cmd->t_task_lba = transport_lba_64(cdb); | |
499bf77b | 875 | |
fde9f50f NB |
876 | if (sbc_check_dpofua(dev, cmd, cdb)) |
877 | return TCM_INVALID_CDB_FIELD; | |
878 | ||
f7b7c06f NB |
879 | ret = sbc_check_prot(dev, cmd, cdb, sectors, false); |
880 | if (ret) | |
881 | return ret; | |
499bf77b | 882 | |
d6e0175c | 883 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
a82a9538 | 884 | cmd->execute_cmd = sbc_execute_rw; |
d6e0175c CH |
885 | break; |
886 | case WRITE_6: | |
887 | sectors = transport_get_sectors_6(cdb); | |
888 | cmd->t_task_lba = transport_lba_21(cdb); | |
889 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
a82a9538 | 890 | cmd->execute_cmd = sbc_execute_rw; |
d6e0175c CH |
891 | break; |
892 | case WRITE_10: | |
893 | case WRITE_VERIFY: | |
894 | sectors = transport_get_sectors_10(cdb); | |
895 | cmd->t_task_lba = transport_lba_32(cdb); | |
499bf77b | 896 | |
fde9f50f NB |
897 | if (sbc_check_dpofua(dev, cmd, cdb)) |
898 | return TCM_INVALID_CDB_FIELD; | |
899 | ||
f7b7c06f NB |
900 | ret = sbc_check_prot(dev, cmd, cdb, sectors, true); |
901 | if (ret) | |
902 | return ret; | |
499bf77b | 903 | |
d6e0175c | 904 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
a82a9538 | 905 | cmd->execute_cmd = sbc_execute_rw; |
d6e0175c CH |
906 | break; |
907 | case WRITE_12: | |
908 | sectors = transport_get_sectors_12(cdb); | |
909 | cmd->t_task_lba = transport_lba_32(cdb); | |
499bf77b | 910 | |
fde9f50f NB |
911 | if (sbc_check_dpofua(dev, cmd, cdb)) |
912 | return TCM_INVALID_CDB_FIELD; | |
913 | ||
f7b7c06f NB |
914 | ret = sbc_check_prot(dev, cmd, cdb, sectors, true); |
915 | if (ret) | |
916 | return ret; | |
499bf77b | 917 | |
d6e0175c | 918 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
a82a9538 | 919 | cmd->execute_cmd = sbc_execute_rw; |
d6e0175c CH |
920 | break; |
921 | case WRITE_16: | |
922 | sectors = transport_get_sectors_16(cdb); | |
923 | cmd->t_task_lba = transport_lba_64(cdb); | |
499bf77b | 924 | |
fde9f50f NB |
925 | if (sbc_check_dpofua(dev, cmd, cdb)) |
926 | return TCM_INVALID_CDB_FIELD; | |
927 | ||
f7b7c06f NB |
928 | ret = sbc_check_prot(dev, cmd, cdb, sectors, true); |
929 | if (ret) | |
930 | return ret; | |
499bf77b | 931 | |
d6e0175c | 932 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
a82a9538 | 933 | cmd->execute_cmd = sbc_execute_rw; |
d6e0175c CH |
934 | break; |
935 | case XDWRITEREAD_10: | |
de103c93 | 936 | if (cmd->data_direction != DMA_TO_DEVICE || |
d6e0175c | 937 | !(cmd->se_cmd_flags & SCF_BIDI)) |
de103c93 | 938 | return TCM_INVALID_CDB_FIELD; |
d6e0175c CH |
939 | sectors = transport_get_sectors_10(cdb); |
940 | ||
fde9f50f NB |
941 | if (sbc_check_dpofua(dev, cmd, cdb)) |
942 | return TCM_INVALID_CDB_FIELD; | |
943 | ||
d6e0175c CH |
944 | cmd->t_task_lba = transport_lba_32(cdb); |
945 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
946 | ||
947 | /* | |
948 | * Setup BIDI XOR callback to be run after I/O completion. | |
949 | */ | |
a82a9538 | 950 | cmd->execute_cmd = sbc_execute_rw; |
d6e0175c | 951 | cmd->transport_complete_callback = &xdreadwrite_callback; |
d6e0175c CH |
952 | break; |
953 | case VARIABLE_LENGTH_CMD: | |
954 | { | |
955 | u16 service_action = get_unaligned_be16(&cdb[8]); | |
956 | switch (service_action) { | |
957 | case XDWRITEREAD_32: | |
958 | sectors = transport_get_sectors_32(cdb); | |
959 | ||
fde9f50f NB |
960 | if (sbc_check_dpofua(dev, cmd, cdb)) |
961 | return TCM_INVALID_CDB_FIELD; | |
d6e0175c CH |
962 | /* |
963 | * Use WRITE_32 and READ_32 opcodes for the emulated | |
964 | * XDWRITE_READ_32 logic. | |
965 | */ | |
966 | cmd->t_task_lba = transport_lba_64_ext(cdb); | |
967 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
968 | ||
969 | /* | |
970 | * Setup BIDI XOR callback to be run during after I/O | |
971 | * completion. | |
972 | */ | |
a82a9538 | 973 | cmd->execute_cmd = sbc_execute_rw; |
d6e0175c | 974 | cmd->transport_complete_callback = &xdreadwrite_callback; |
d6e0175c CH |
975 | break; |
976 | case WRITE_SAME_32: | |
977 | sectors = transport_get_sectors_32(cdb); | |
978 | if (!sectors) { | |
979 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not" | |
980 | " supported\n"); | |
de103c93 | 981 | return TCM_INVALID_CDB_FIELD; |
d6e0175c CH |
982 | } |
983 | ||
1fd032ee | 984 | size = sbc_get_size(cmd, 1); |
d6e0175c CH |
985 | cmd->t_task_lba = get_unaligned_be64(&cdb[12]); |
986 | ||
cd063bef | 987 | ret = sbc_setup_write_same(cmd, &cdb[10], ops); |
6b64e1fe | 988 | if (ret) |
cd063bef | 989 | return ret; |
d6e0175c CH |
990 | break; |
991 | default: | |
992 | pr_err("VARIABLE_LENGTH_CMD service action" | |
993 | " 0x%04x not supported\n", service_action); | |
de103c93 | 994 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
d6e0175c CH |
995 | } |
996 | break; | |
997 | } | |
68ff9b9b NB |
998 | case COMPARE_AND_WRITE: |
999 | sectors = cdb[13]; | |
1000 | /* | |
1001 | * Currently enforce COMPARE_AND_WRITE for a single sector | |
1002 | */ | |
1003 | if (sectors > 1) { | |
1004 | pr_err("COMPARE_AND_WRITE contains NoLB: %u greater" | |
1005 | " than 1\n", sectors); | |
1006 | return TCM_INVALID_CDB_FIELD; | |
1007 | } | |
ab81a5e0 DD |
1008 | if (sbc_check_dpofua(dev, cmd, cdb)) |
1009 | return TCM_INVALID_CDB_FIELD; | |
1010 | ||
68ff9b9b NB |
1011 | /* |
1012 | * Double size because we have two buffers, note that | |
1013 | * zero is not an error.. | |
1014 | */ | |
1015 | size = 2 * sbc_get_size(cmd, sectors); | |
1016 | cmd->t_task_lba = get_unaligned_be64(&cdb[2]); | |
1017 | cmd->t_task_nolb = sectors; | |
1018 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB | SCF_COMPARE_AND_WRITE; | |
68ff9b9b NB |
1019 | cmd->execute_cmd = sbc_compare_and_write; |
1020 | cmd->transport_complete_callback = compare_and_write_callback; | |
1021 | break; | |
d6e0175c | 1022 | case READ_CAPACITY: |
1fd032ee CH |
1023 | size = READ_CAP_LEN; |
1024 | cmd->execute_cmd = sbc_emulate_readcapacity; | |
d6e0175c | 1025 | break; |
eb846d9f | 1026 | case SERVICE_ACTION_IN_16: |
d6e0175c CH |
1027 | switch (cmd->t_task_cdb[1] & 0x1f) { |
1028 | case SAI_READ_CAPACITY_16: | |
1fd032ee | 1029 | cmd->execute_cmd = sbc_emulate_readcapacity_16; |
d6e0175c | 1030 | break; |
c66094bf HR |
1031 | case SAI_REPORT_REFERRALS: |
1032 | cmd->execute_cmd = target_emulate_report_referrals; | |
1033 | break; | |
d6e0175c CH |
1034 | default: |
1035 | pr_err("Unsupported SA: 0x%02x\n", | |
1036 | cmd->t_task_cdb[1] & 0x1f); | |
de103c93 | 1037 | return TCM_INVALID_CDB_FIELD; |
d6e0175c | 1038 | } |
1fd032ee | 1039 | size = (cdb[10] << 24) | (cdb[11] << 16) | |
d6e0175c CH |
1040 | (cdb[12] << 8) | cdb[13]; |
1041 | break; | |
1042 | case SYNCHRONIZE_CACHE: | |
1043 | case SYNCHRONIZE_CACHE_16: | |
d6e0175c CH |
1044 | if (cdb[0] == SYNCHRONIZE_CACHE) { |
1045 | sectors = transport_get_sectors_10(cdb); | |
1046 | cmd->t_task_lba = transport_lba_32(cdb); | |
1047 | } else { | |
1048 | sectors = transport_get_sectors_16(cdb); | |
1049 | cmd->t_task_lba = transport_lba_64(cdb); | |
1050 | } | |
6ef31dc7 CVB |
1051 | if (ops->execute_sync_cache) { |
1052 | cmd->execute_cmd = ops->execute_sync_cache; | |
1053 | goto check_lba; | |
d6e0175c | 1054 | } |
6ef31dc7 CVB |
1055 | size = 0; |
1056 | cmd->execute_cmd = sbc_emulate_noop; | |
d6e0175c CH |
1057 | break; |
1058 | case UNMAP: | |
14150a6b | 1059 | if (!ops->execute_unmap) |
de103c93 | 1060 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
14150a6b | 1061 | |
61fdb4ac NB |
1062 | if (!dev->dev_attrib.emulate_tpu) { |
1063 | pr_err("Got UNMAP, but backend device has" | |
1064 | " emulate_tpu disabled\n"); | |
1065 | return TCM_UNSUPPORTED_SCSI_OPCODE; | |
1066 | } | |
1fd032ee | 1067 | size = get_unaligned_be16(&cdb[7]); |
62e46942 | 1068 | cmd->execute_cmd = sbc_execute_unmap; |
d6e0175c CH |
1069 | break; |
1070 | case WRITE_SAME_16: | |
1071 | sectors = transport_get_sectors_16(cdb); | |
1072 | if (!sectors) { | |
1073 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); | |
de103c93 | 1074 | return TCM_INVALID_CDB_FIELD; |
d6e0175c CH |
1075 | } |
1076 | ||
1fd032ee | 1077 | size = sbc_get_size(cmd, 1); |
d6e0175c CH |
1078 | cmd->t_task_lba = get_unaligned_be64(&cdb[2]); |
1079 | ||
cd063bef | 1080 | ret = sbc_setup_write_same(cmd, &cdb[1], ops); |
6b64e1fe | 1081 | if (ret) |
cd063bef | 1082 | return ret; |
d6e0175c CH |
1083 | break; |
1084 | case WRITE_SAME: | |
1085 | sectors = transport_get_sectors_10(cdb); | |
1086 | if (!sectors) { | |
1087 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); | |
de103c93 | 1088 | return TCM_INVALID_CDB_FIELD; |
d6e0175c CH |
1089 | } |
1090 | ||
1fd032ee | 1091 | size = sbc_get_size(cmd, 1); |
d6e0175c CH |
1092 | cmd->t_task_lba = get_unaligned_be32(&cdb[2]); |
1093 | ||
1094 | /* | |
1095 | * Follow sbcr26 with WRITE_SAME (10) and check for the existence | |
1096 | * of byte 1 bit 3 UNMAP instead of original reserved field | |
1097 | */ | |
cd063bef | 1098 | ret = sbc_setup_write_same(cmd, &cdb[1], ops); |
6b64e1fe | 1099 | if (ret) |
cd063bef | 1100 | return ret; |
d6e0175c CH |
1101 | break; |
1102 | case VERIFY: | |
1fd032ee | 1103 | size = 0; |
c52716de CVB |
1104 | sectors = transport_get_sectors_10(cdb); |
1105 | cmd->t_task_lba = transport_lba_32(cdb); | |
1920ed61 | 1106 | cmd->execute_cmd = sbc_emulate_noop; |
c52716de | 1107 | goto check_lba; |
1a1ff38c BK |
1108 | case REZERO_UNIT: |
1109 | case SEEK_6: | |
1110 | case SEEK_10: | |
1111 | /* | |
1112 | * There are still clients out there which use these old SCSI-2 | |
1113 | * commands. This mainly happens when running VMs with legacy | |
1114 | * guest systems, connected via SCSI command pass-through to | |
1115 | * iSCSI targets. Make them happy and return status GOOD. | |
1116 | */ | |
1117 | size = 0; | |
1118 | cmd->execute_cmd = sbc_emulate_noop; | |
1119 | break; | |
45182ed5 BB |
1120 | case START_STOP: |
1121 | size = 0; | |
1122 | cmd->execute_cmd = sbc_emulate_startstop; | |
1123 | break; | |
d6e0175c | 1124 | default: |
1fd032ee | 1125 | ret = spc_parse_cdb(cmd, &size); |
d6e0175c CH |
1126 | if (ret) |
1127 | return ret; | |
1128 | } | |
1129 | ||
1130 | /* reject any command that we don't have a handler for */ | |
20959c4b | 1131 | if (!cmd->execute_cmd) |
de103c93 | 1132 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
d6e0175c CH |
1133 | |
1134 | if (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) { | |
1fd032ee | 1135 | unsigned long long end_lba; |
6ef31dc7 | 1136 | check_lba: |
1fd032ee | 1137 | end_lba = dev->transport->get_blocks(dev) + 1; |
aa179935 NB |
1138 | if (((cmd->t_task_lba + sectors) < cmd->t_task_lba) || |
1139 | ((cmd->t_task_lba + sectors) > end_lba)) { | |
1fd032ee CH |
1140 | pr_err("cmd exceeds last lba %llu " |
1141 | "(lba %llu, sectors %u)\n", | |
1142 | end_lba, cmd->t_task_lba, sectors); | |
09ceadc7 | 1143 | return TCM_ADDRESS_OUT_OF_RANGE; |
1fd032ee CH |
1144 | } |
1145 | ||
68ff9b9b NB |
1146 | if (!(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) |
1147 | size = sbc_get_size(cmd, sectors); | |
d6e0175c CH |
1148 | } |
1149 | ||
de103c93 | 1150 | return target_cmd_size_check(cmd, size); |
d6e0175c CH |
1151 | } |
1152 | EXPORT_SYMBOL(sbc_parse_cdb); | |
6f23ac8a | 1153 | |
6f23ac8a CH |
1154 | u32 sbc_get_device_type(struct se_device *dev) |
1155 | { | |
1156 | return TYPE_DISK; | |
1157 | } | |
1158 | EXPORT_SYMBOL(sbc_get_device_type); | |
86d71829 | 1159 | |
62e46942 CH |
1160 | static sense_reason_t |
1161 | sbc_execute_unmap(struct se_cmd *cmd) | |
86d71829 | 1162 | { |
62e46942 | 1163 | struct sbc_ops *ops = cmd->protocol_data; |
86d71829 AH |
1164 | struct se_device *dev = cmd->se_dev; |
1165 | unsigned char *buf, *ptr = NULL; | |
1166 | sector_t lba; | |
1167 | int size; | |
1168 | u32 range; | |
1169 | sense_reason_t ret = 0; | |
1170 | int dl, bd_dl; | |
1171 | ||
1172 | /* We never set ANC_SUP */ | |
1173 | if (cmd->t_task_cdb[1]) | |
1174 | return TCM_INVALID_CDB_FIELD; | |
1175 | ||
1176 | if (cmd->data_length == 0) { | |
1177 | target_complete_cmd(cmd, SAM_STAT_GOOD); | |
1178 | return 0; | |
1179 | } | |
1180 | ||
1181 | if (cmd->data_length < 8) { | |
1182 | pr_warn("UNMAP parameter list length %u too small\n", | |
1183 | cmd->data_length); | |
1184 | return TCM_PARAMETER_LIST_LENGTH_ERROR; | |
1185 | } | |
1186 | ||
1187 | buf = transport_kmap_data_sg(cmd); | |
1188 | if (!buf) | |
1189 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
1190 | ||
1191 | dl = get_unaligned_be16(&buf[0]); | |
1192 | bd_dl = get_unaligned_be16(&buf[2]); | |
1193 | ||
1194 | size = cmd->data_length - 8; | |
1195 | if (bd_dl > size) | |
1196 | pr_warn("UNMAP parameter list length %u too small, ignoring bd_dl %u\n", | |
1197 | cmd->data_length, bd_dl); | |
1198 | else | |
1199 | size = bd_dl; | |
1200 | ||
1201 | if (size / 16 > dev->dev_attrib.max_unmap_block_desc_count) { | |
1202 | ret = TCM_INVALID_PARAMETER_LIST; | |
1203 | goto err; | |
1204 | } | |
1205 | ||
1206 | /* First UNMAP block descriptor starts at 8 byte offset */ | |
1207 | ptr = &buf[8]; | |
1208 | pr_debug("UNMAP: Sub: %s Using dl: %u bd_dl: %u size: %u" | |
1209 | " ptr: %p\n", dev->transport->name, dl, bd_dl, size, ptr); | |
1210 | ||
1211 | while (size >= 16) { | |
1212 | lba = get_unaligned_be64(&ptr[0]); | |
1213 | range = get_unaligned_be32(&ptr[8]); | |
1214 | pr_debug("UNMAP: Using lba: %llu and range: %u\n", | |
1215 | (unsigned long long)lba, range); | |
1216 | ||
1217 | if (range > dev->dev_attrib.max_unmap_lba_count) { | |
1218 | ret = TCM_INVALID_PARAMETER_LIST; | |
1219 | goto err; | |
1220 | } | |
1221 | ||
1222 | if (lba + range > dev->transport->get_blocks(dev) + 1) { | |
1223 | ret = TCM_ADDRESS_OUT_OF_RANGE; | |
1224 | goto err; | |
1225 | } | |
1226 | ||
62e46942 | 1227 | ret = ops->execute_unmap(cmd, lba, range); |
86d71829 AH |
1228 | if (ret) |
1229 | goto err; | |
1230 | ||
1231 | ptr += 16; | |
1232 | size -= 16; | |
1233 | } | |
1234 | ||
1235 | err: | |
1236 | transport_kunmap_data_sg(cmd); | |
1237 | if (!ret) | |
1238 | target_complete_cmd(cmd, GOOD); | |
1239 | return ret; | |
1240 | } | |
41861fa8 | 1241 | |
66a3d5bc NB |
1242 | void |
1243 | sbc_dif_generate(struct se_cmd *cmd) | |
1244 | { | |
1245 | struct se_device *dev = cmd->se_dev; | |
fe052a18 | 1246 | struct t10_pi_tuple *sdt; |
18213afb | 1247 | struct scatterlist *dsg = cmd->t_data_sg, *psg; |
66a3d5bc NB |
1248 | sector_t sector = cmd->t_task_lba; |
1249 | void *daddr, *paddr; | |
1250 | int i, j, offset = 0; | |
18213afb | 1251 | unsigned int block_size = dev->dev_attrib.block_size; |
66a3d5bc | 1252 | |
18213afb | 1253 | for_each_sg(cmd->t_prot_sg, psg, cmd->t_prot_nents, i) { |
66a3d5bc | 1254 | paddr = kmap_atomic(sg_page(psg)) + psg->offset; |
18213afb | 1255 | daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; |
66a3d5bc | 1256 | |
18213afb | 1257 | for (j = 0; j < psg->length; |
fe052a18 | 1258 | j += sizeof(*sdt)) { |
18213afb AM |
1259 | __u16 crc; |
1260 | unsigned int avail; | |
66a3d5bc | 1261 | |
18213afb AM |
1262 | if (offset >= dsg->length) { |
1263 | offset -= dsg->length; | |
1264 | kunmap_atomic(daddr - dsg->offset); | |
1265 | dsg = sg_next(dsg); | |
1266 | if (!dsg) { | |
1267 | kunmap_atomic(paddr - psg->offset); | |
1268 | return; | |
1269 | } | |
1270 | daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; | |
66a3d5bc | 1271 | } |
66a3d5bc | 1272 | |
18213afb AM |
1273 | sdt = paddr + j; |
1274 | avail = min(block_size, dsg->length - offset); | |
1275 | crc = crc_t10dif(daddr + offset, avail); | |
1276 | if (avail < block_size) { | |
1277 | kunmap_atomic(daddr - dsg->offset); | |
1278 | dsg = sg_next(dsg); | |
1279 | if (!dsg) { | |
1280 | kunmap_atomic(paddr - psg->offset); | |
1281 | return; | |
1282 | } | |
1283 | daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; | |
1284 | offset = block_size - avail; | |
1285 | crc = crc_t10dif_update(crc, daddr, offset); | |
1286 | } else { | |
1287 | offset += block_size; | |
66a3d5bc NB |
1288 | } |
1289 | ||
18213afb | 1290 | sdt->guard_tag = cpu_to_be16(crc); |
823ddd87 | 1291 | if (cmd->prot_type == TARGET_DIF_TYPE1_PROT) |
66a3d5bc NB |
1292 | sdt->ref_tag = cpu_to_be32(sector & 0xffffffff); |
1293 | sdt->app_tag = 0; | |
1294 | ||
6ae50408 | 1295 | pr_debug("DIF %s INSERT sector: %llu guard_tag: 0x%04x" |
66a3d5bc | 1296 | " app_tag: 0x%04x ref_tag: %u\n", |
6ae50408 NB |
1297 | (cmd->data_direction == DMA_TO_DEVICE) ? |
1298 | "WRITE" : "READ", (unsigned long long)sector, | |
1299 | sdt->guard_tag, sdt->app_tag, | |
1300 | be32_to_cpu(sdt->ref_tag)); | |
66a3d5bc NB |
1301 | |
1302 | sector++; | |
66a3d5bc NB |
1303 | } |
1304 | ||
18213afb AM |
1305 | kunmap_atomic(daddr - dsg->offset); |
1306 | kunmap_atomic(paddr - psg->offset); | |
66a3d5bc NB |
1307 | } |
1308 | } | |
1309 | ||
41861fa8 | 1310 | static sense_reason_t |
fe052a18 | 1311 | sbc_dif_v1_verify(struct se_cmd *cmd, struct t10_pi_tuple *sdt, |
18213afb | 1312 | __u16 crc, sector_t sector, unsigned int ei_lba) |
41861fa8 | 1313 | { |
41861fa8 NB |
1314 | __be16 csum; |
1315 | ||
d7a463b0 NB |
1316 | if (!(cmd->prot_checks & TARGET_DIF_CHECK_GUARD)) |
1317 | goto check_ref; | |
1318 | ||
18213afb | 1319 | csum = cpu_to_be16(crc); |
41861fa8 NB |
1320 | |
1321 | if (sdt->guard_tag != csum) { | |
1322 | pr_err("DIFv1 checksum failed on sector %llu guard tag 0x%04x" | |
1323 | " csum 0x%04x\n", (unsigned long long)sector, | |
1324 | be16_to_cpu(sdt->guard_tag), be16_to_cpu(csum)); | |
1325 | return TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED; | |
1326 | } | |
1327 | ||
d7a463b0 NB |
1328 | check_ref: |
1329 | if (!(cmd->prot_checks & TARGET_DIF_CHECK_REFTAG)) | |
1330 | return 0; | |
1331 | ||
823ddd87 | 1332 | if (cmd->prot_type == TARGET_DIF_TYPE1_PROT && |
41861fa8 NB |
1333 | be32_to_cpu(sdt->ref_tag) != (sector & 0xffffffff)) { |
1334 | pr_err("DIFv1 Type 1 reference failed on sector: %llu tag: 0x%08x" | |
1335 | " sector MSB: 0x%08x\n", (unsigned long long)sector, | |
1336 | be32_to_cpu(sdt->ref_tag), (u32)(sector & 0xffffffff)); | |
1337 | return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED; | |
1338 | } | |
1339 | ||
823ddd87 | 1340 | if (cmd->prot_type == TARGET_DIF_TYPE2_PROT && |
41861fa8 NB |
1341 | be32_to_cpu(sdt->ref_tag) != ei_lba) { |
1342 | pr_err("DIFv1 Type 2 reference failed on sector: %llu tag: 0x%08x" | |
1343 | " ei_lba: 0x%08x\n", (unsigned long long)sector, | |
1344 | be32_to_cpu(sdt->ref_tag), ei_lba); | |
1345 | return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED; | |
1346 | } | |
1347 | ||
1348 | return 0; | |
1349 | } | |
1350 | ||
f75b6fae SG |
1351 | void sbc_dif_copy_prot(struct se_cmd *cmd, unsigned int sectors, bool read, |
1352 | struct scatterlist *sg, int sg_off) | |
41861fa8 NB |
1353 | { |
1354 | struct se_device *dev = cmd->se_dev; | |
1355 | struct scatterlist *psg; | |
1356 | void *paddr, *addr; | |
1357 | unsigned int i, len, left; | |
10762e80 | 1358 | unsigned int offset = sg_off; |
41861fa8 | 1359 | |
38b57f82 NB |
1360 | if (!sg) |
1361 | return; | |
1362 | ||
41861fa8 NB |
1363 | left = sectors * dev->prot_length; |
1364 | ||
1365 | for_each_sg(cmd->t_prot_sg, psg, cmd->t_prot_nents, i) { | |
16c0ae02 | 1366 | unsigned int psg_len, copied = 0; |
d6a65fdc | 1367 | |
41861fa8 | 1368 | paddr = kmap_atomic(sg_page(psg)) + psg->offset; |
16c0ae02 SG |
1369 | psg_len = min(left, psg->length); |
1370 | while (psg_len) { | |
1371 | len = min(psg_len, sg->length - offset); | |
1372 | addr = kmap_atomic(sg_page(sg)) + sg->offset + offset; | |
1373 | ||
1374 | if (read) | |
1375 | memcpy(paddr + copied, addr, len); | |
1376 | else | |
1377 | memcpy(addr, paddr + copied, len); | |
1378 | ||
1379 | left -= len; | |
1380 | offset += len; | |
1381 | copied += len; | |
1382 | psg_len -= len; | |
1383 | ||
57636388 AM |
1384 | kunmap_atomic(addr - sg->offset - offset); |
1385 | ||
16c0ae02 SG |
1386 | if (offset >= sg->length) { |
1387 | sg = sg_next(sg); | |
1388 | offset = 0; | |
1389 | } | |
16c0ae02 | 1390 | } |
57636388 | 1391 | kunmap_atomic(paddr - psg->offset); |
41861fa8 NB |
1392 | } |
1393 | } | |
f75b6fae | 1394 | EXPORT_SYMBOL(sbc_dif_copy_prot); |
41861fa8 NB |
1395 | |
1396 | sense_reason_t | |
f75b6fae | 1397 | sbc_dif_verify(struct se_cmd *cmd, sector_t start, unsigned int sectors, |
414e4627 | 1398 | unsigned int ei_lba, struct scatterlist *psg, int psg_off) |
41861fa8 NB |
1399 | { |
1400 | struct se_device *dev = cmd->se_dev; | |
fe052a18 | 1401 | struct t10_pi_tuple *sdt; |
18213afb | 1402 | struct scatterlist *dsg = cmd->t_data_sg; |
41861fa8 NB |
1403 | sector_t sector = start; |
1404 | void *daddr, *paddr; | |
18213afb | 1405 | int i; |
41861fa8 | 1406 | sense_reason_t rc; |
18213afb AM |
1407 | int dsg_off = 0; |
1408 | unsigned int block_size = dev->dev_attrib.block_size; | |
41861fa8 | 1409 | |
18213afb | 1410 | for (; psg && sector < start + sectors; psg = sg_next(psg)) { |
41861fa8 | 1411 | paddr = kmap_atomic(sg_page(psg)) + psg->offset; |
41861fa8 | 1412 | daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; |
41861fa8 | 1413 | |
18213afb AM |
1414 | for (i = psg_off; i < psg->length && |
1415 | sector < start + sectors; | |
fe052a18 | 1416 | i += sizeof(*sdt)) { |
18213afb AM |
1417 | __u16 crc; |
1418 | unsigned int avail; | |
41861fa8 | 1419 | |
18213afb AM |
1420 | if (dsg_off >= dsg->length) { |
1421 | dsg_off -= dsg->length; | |
1422 | kunmap_atomic(daddr - dsg->offset); | |
1423 | dsg = sg_next(dsg); | |
1424 | if (!dsg) { | |
1425 | kunmap_atomic(paddr - psg->offset); | |
1426 | return 0; | |
1427 | } | |
1428 | daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; | |
41861fa8 NB |
1429 | } |
1430 | ||
18213afb | 1431 | sdt = paddr + i; |
41861fa8 NB |
1432 | |
1433 | pr_debug("DIF READ sector: %llu guard_tag: 0x%04x" | |
1434 | " app_tag: 0x%04x ref_tag: %u\n", | |
1435 | (unsigned long long)sector, sdt->guard_tag, | |
1436 | sdt->app_tag, be32_to_cpu(sdt->ref_tag)); | |
1437 | ||
1438 | if (sdt->app_tag == cpu_to_be16(0xffff)) { | |
18213afb AM |
1439 | dsg_off += block_size; |
1440 | goto next; | |
1441 | } | |
1442 | ||
1443 | avail = min(block_size, dsg->length - dsg_off); | |
1444 | crc = crc_t10dif(daddr + dsg_off, avail); | |
1445 | if (avail < block_size) { | |
1446 | kunmap_atomic(daddr - dsg->offset); | |
1447 | dsg = sg_next(dsg); | |
1448 | if (!dsg) { | |
1449 | kunmap_atomic(paddr - psg->offset); | |
1450 | return 0; | |
1451 | } | |
1452 | daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; | |
1453 | dsg_off = block_size - avail; | |
1454 | crc = crc_t10dif_update(crc, daddr, dsg_off); | |
1455 | } else { | |
1456 | dsg_off += block_size; | |
41861fa8 NB |
1457 | } |
1458 | ||
18213afb | 1459 | rc = sbc_dif_v1_verify(cmd, sdt, crc, sector, ei_lba); |
41861fa8 | 1460 | if (rc) { |
414e4627 | 1461 | kunmap_atomic(daddr - dsg->offset); |
18213afb | 1462 | kunmap_atomic(paddr - psg->offset); |
76736db3 | 1463 | cmd->bad_sector = sector; |
41861fa8 NB |
1464 | return rc; |
1465 | } | |
18213afb | 1466 | next: |
41861fa8 NB |
1467 | sector++; |
1468 | ei_lba++; | |
41861fa8 NB |
1469 | } |
1470 | ||
18213afb | 1471 | psg_off = 0; |
414e4627 | 1472 | kunmap_atomic(daddr - dsg->offset); |
18213afb | 1473 | kunmap_atomic(paddr - psg->offset); |
41861fa8 | 1474 | } |
41861fa8 NB |
1475 | |
1476 | return 0; | |
1477 | } | |
f75b6fae | 1478 | EXPORT_SYMBOL(sbc_dif_verify); |