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Commit | Line | Data |
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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> |
8dcf07be | 27 | #include <linux/t10-pi.h> |
d6e0175c | 28 | #include <asm/unaligned.h> |
ba929992 | 29 | #include <scsi/scsi_proto.h> |
68ff9b9b | 30 | #include <scsi/scsi_tcq.h> |
d6e0175c CH |
31 | |
32 | #include <target/target_core_base.h> | |
33 | #include <target/target_core_backend.h> | |
34 | #include <target/target_core_fabric.h> | |
35 | ||
36 | #include "target_core_internal.h" | |
37 | #include "target_core_ua.h" | |
c66094bf | 38 | #include "target_core_alua.h" |
d6e0175c | 39 | |
afd73f1b NB |
40 | static sense_reason_t |
41 | sbc_check_prot(struct se_device *, struct se_cmd *, unsigned char *, u32, bool); | |
62e46942 | 42 | static sense_reason_t sbc_execute_unmap(struct se_cmd *cmd); |
afd73f1b | 43 | |
de103c93 CH |
44 | static sense_reason_t |
45 | sbc_emulate_readcapacity(struct se_cmd *cmd) | |
1fd032ee CH |
46 | { |
47 | struct se_device *dev = cmd->se_dev; | |
8dc8632a | 48 | unsigned char *cdb = cmd->t_task_cdb; |
1fd032ee | 49 | unsigned long long blocks_long = dev->transport->get_blocks(dev); |
a50da144 PB |
50 | unsigned char *rbuf; |
51 | unsigned char buf[8]; | |
1fd032ee CH |
52 | u32 blocks; |
53 | ||
8dc8632a RD |
54 | /* |
55 | * SBC-2 says: | |
56 | * If the PMI bit is set to zero and the LOGICAL BLOCK | |
57 | * ADDRESS field is not set to zero, the device server shall | |
58 | * terminate the command with CHECK CONDITION status with | |
59 | * the sense key set to ILLEGAL REQUEST and the additional | |
60 | * sense code set to INVALID FIELD IN CDB. | |
61 | * | |
62 | * In SBC-3, these fields are obsolete, but some SCSI | |
63 | * compliance tests actually check this, so we might as well | |
64 | * follow SBC-2. | |
65 | */ | |
66 | if (!(cdb[8] & 1) && !!(cdb[2] | cdb[3] | cdb[4] | cdb[5])) | |
67 | return TCM_INVALID_CDB_FIELD; | |
68 | ||
1fd032ee CH |
69 | if (blocks_long >= 0x00000000ffffffff) |
70 | blocks = 0xffffffff; | |
71 | else | |
72 | blocks = (u32)blocks_long; | |
73 | ||
1fd032ee CH |
74 | buf[0] = (blocks >> 24) & 0xff; |
75 | buf[1] = (blocks >> 16) & 0xff; | |
76 | buf[2] = (blocks >> 8) & 0xff; | |
77 | buf[3] = blocks & 0xff; | |
0fd97ccf CH |
78 | buf[4] = (dev->dev_attrib.block_size >> 24) & 0xff; |
79 | buf[5] = (dev->dev_attrib.block_size >> 16) & 0xff; | |
80 | buf[6] = (dev->dev_attrib.block_size >> 8) & 0xff; | |
81 | buf[7] = dev->dev_attrib.block_size & 0xff; | |
1fd032ee | 82 | |
a50da144 | 83 | rbuf = transport_kmap_data_sg(cmd); |
8b4b0dcb NB |
84 | if (rbuf) { |
85 | memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length)); | |
86 | transport_kunmap_data_sg(cmd); | |
87 | } | |
1fd032ee | 88 | |
2426bd45 | 89 | target_complete_cmd_with_length(cmd, GOOD, 8); |
1fd032ee CH |
90 | return 0; |
91 | } | |
92 | ||
de103c93 CH |
93 | static sense_reason_t |
94 | sbc_emulate_readcapacity_16(struct se_cmd *cmd) | |
1fd032ee CH |
95 | { |
96 | struct se_device *dev = cmd->se_dev; | |
2d335983 | 97 | struct se_session *sess = cmd->se_sess; |
9ef5466e NB |
98 | int pi_prot_type = dev->dev_attrib.pi_prot_type; |
99 | ||
a50da144 PB |
100 | unsigned char *rbuf; |
101 | unsigned char buf[32]; | |
1fd032ee CH |
102 | unsigned long long blocks = dev->transport->get_blocks(dev); |
103 | ||
a50da144 | 104 | memset(buf, 0, sizeof(buf)); |
1fd032ee CH |
105 | buf[0] = (blocks >> 56) & 0xff; |
106 | buf[1] = (blocks >> 48) & 0xff; | |
107 | buf[2] = (blocks >> 40) & 0xff; | |
108 | buf[3] = (blocks >> 32) & 0xff; | |
109 | buf[4] = (blocks >> 24) & 0xff; | |
110 | buf[5] = (blocks >> 16) & 0xff; | |
111 | buf[6] = (blocks >> 8) & 0xff; | |
112 | buf[7] = blocks & 0xff; | |
0fd97ccf CH |
113 | buf[8] = (dev->dev_attrib.block_size >> 24) & 0xff; |
114 | buf[9] = (dev->dev_attrib.block_size >> 16) & 0xff; | |
115 | buf[10] = (dev->dev_attrib.block_size >> 8) & 0xff; | |
116 | buf[11] = dev->dev_attrib.block_size & 0xff; | |
56dac14c NB |
117 | /* |
118 | * Set P_TYPE and PROT_EN bits for DIF support | |
119 | */ | |
2d335983 | 120 | if (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) { |
9ef5466e NB |
121 | /* |
122 | * Only override a device's pi_prot_type if no T10-PI is | |
123 | * available, and sess_prot_type has been explicitly enabled. | |
124 | */ | |
125 | if (!pi_prot_type) | |
126 | pi_prot_type = sess->sess_prot_type; | |
127 | ||
128 | if (pi_prot_type) | |
129 | buf[12] = (pi_prot_type - 1) << 1 | 0x1; | |
2d335983 | 130 | } |
7f7caf6a AG |
131 | |
132 | if (dev->transport->get_lbppbe) | |
133 | buf[13] = dev->transport->get_lbppbe(dev) & 0x0f; | |
134 | ||
135 | if (dev->transport->get_alignment_offset_lbas) { | |
136 | u16 lalba = dev->transport->get_alignment_offset_lbas(dev); | |
137 | buf[14] = (lalba >> 8) & 0x3f; | |
138 | buf[15] = lalba & 0xff; | |
139 | } | |
140 | ||
1fd032ee CH |
141 | /* |
142 | * Set Thin Provisioning Enable bit following sbc3r22 in section | |
143 | * READ CAPACITY (16) byte 14 if emulate_tpu or emulate_tpws is enabled. | |
144 | */ | |
e6f41633 | 145 | if (dev->dev_attrib.emulate_tpu || dev->dev_attrib.emulate_tpws) { |
7f7caf6a | 146 | buf[14] |= 0x80; |
1fd032ee | 147 | |
e6f41633 JP |
148 | /* |
149 | * LBPRZ signifies that zeroes will be read back from an LBA after | |
150 | * an UNMAP or WRITE SAME w/ unmap bit (sbc3r36 5.16.2) | |
151 | */ | |
152 | if (dev->dev_attrib.unmap_zeroes_data) | |
153 | buf[14] |= 0x40; | |
154 | } | |
155 | ||
a50da144 | 156 | rbuf = transport_kmap_data_sg(cmd); |
8b4b0dcb NB |
157 | if (rbuf) { |
158 | memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length)); | |
159 | transport_kunmap_data_sg(cmd); | |
160 | } | |
1fd032ee | 161 | |
2426bd45 | 162 | target_complete_cmd_with_length(cmd, GOOD, 32); |
1fd032ee CH |
163 | return 0; |
164 | } | |
165 | ||
45182ed5 BB |
166 | static sense_reason_t |
167 | sbc_emulate_startstop(struct se_cmd *cmd) | |
168 | { | |
169 | unsigned char *cdb = cmd->t_task_cdb; | |
170 | ||
171 | /* | |
172 | * See sbc3r36 section 5.25 | |
173 | * Immediate bit should be set since there is nothing to complete | |
174 | * POWER CONDITION MODIFIER 0h | |
175 | */ | |
176 | if (!(cdb[1] & 1) || cdb[2] || cdb[3]) | |
177 | return TCM_INVALID_CDB_FIELD; | |
178 | ||
179 | /* | |
180 | * See sbc3r36 section 5.25 | |
181 | * POWER CONDITION 0h START_VALID - process START and LOEJ | |
182 | */ | |
183 | if (cdb[4] >> 4 & 0xf) | |
184 | return TCM_INVALID_CDB_FIELD; | |
185 | ||
186 | /* | |
187 | * See sbc3r36 section 5.25 | |
188 | * LOEJ 0h - nothing to load or unload | |
189 | * START 1h - we are ready | |
190 | */ | |
191 | if (!(cdb[4] & 1) || (cdb[4] & 2) || (cdb[4] & 4)) | |
192 | return TCM_INVALID_CDB_FIELD; | |
193 | ||
194 | target_complete_cmd(cmd, SAM_STAT_GOOD); | |
195 | return 0; | |
196 | } | |
197 | ||
972b29c8 | 198 | sector_t sbc_get_write_same_sectors(struct se_cmd *cmd) |
1fd032ee | 199 | { |
1fd032ee | 200 | u32 num_blocks; |
1fd032ee CH |
201 | |
202 | if (cmd->t_task_cdb[0] == WRITE_SAME) | |
203 | num_blocks = get_unaligned_be16(&cmd->t_task_cdb[7]); | |
204 | else if (cmd->t_task_cdb[0] == WRITE_SAME_16) | |
205 | num_blocks = get_unaligned_be32(&cmd->t_task_cdb[10]); | |
206 | else /* WRITE_SAME_32 via VARIABLE_LENGTH_CMD */ | |
207 | num_blocks = get_unaligned_be32(&cmd->t_task_cdb[28]); | |
208 | ||
209 | /* | |
210 | * Use the explicit range when non zero is supplied, otherwise calculate | |
211 | * the remaining range based on ->get_blocks() - starting LBA. | |
212 | */ | |
6f974e8c CH |
213 | if (num_blocks) |
214 | return num_blocks; | |
1fd032ee | 215 | |
6f974e8c CH |
216 | return cmd->se_dev->transport->get_blocks(cmd->se_dev) - |
217 | cmd->t_task_lba + 1; | |
1fd032ee | 218 | } |
972b29c8 | 219 | EXPORT_SYMBOL(sbc_get_write_same_sectors); |
1fd032ee | 220 | |
b753d643 CH |
221 | static sense_reason_t |
222 | sbc_execute_write_same_unmap(struct se_cmd *cmd) | |
223 | { | |
224 | struct sbc_ops *ops = cmd->protocol_data; | |
225 | sector_t nolb = sbc_get_write_same_sectors(cmd); | |
226 | sense_reason_t ret; | |
227 | ||
228 | if (nolb) { | |
229 | ret = ops->execute_unmap(cmd, cmd->t_task_lba, nolb); | |
230 | if (ret) | |
231 | return ret; | |
232 | } | |
233 | ||
234 | target_complete_cmd(cmd, GOOD); | |
235 | return 0; | |
236 | } | |
237 | ||
de103c93 | 238 | static sense_reason_t |
1920ed61 | 239 | sbc_emulate_noop(struct se_cmd *cmd) |
1a1ff38c BK |
240 | { |
241 | target_complete_cmd(cmd, GOOD); | |
242 | return 0; | |
243 | } | |
244 | ||
d6e0175c CH |
245 | static inline u32 sbc_get_size(struct se_cmd *cmd, u32 sectors) |
246 | { | |
0fd97ccf | 247 | return cmd->se_dev->dev_attrib.block_size * sectors; |
d6e0175c CH |
248 | } |
249 | ||
d6e0175c CH |
250 | static inline u32 transport_get_sectors_6(unsigned char *cdb) |
251 | { | |
252 | /* | |
253 | * Use 8-bit sector value. SBC-3 says: | |
254 | * | |
255 | * A TRANSFER LENGTH field set to zero specifies that 256 | |
256 | * logical blocks shall be written. Any other value | |
257 | * specifies the number of logical blocks that shall be | |
258 | * written. | |
259 | */ | |
260 | return cdb[4] ? : 256; | |
261 | } | |
262 | ||
263 | static inline u32 transport_get_sectors_10(unsigned char *cdb) | |
264 | { | |
265 | return (u32)(cdb[7] << 8) + cdb[8]; | |
266 | } | |
267 | ||
268 | static inline u32 transport_get_sectors_12(unsigned char *cdb) | |
269 | { | |
270 | return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9]; | |
271 | } | |
272 | ||
273 | static inline u32 transport_get_sectors_16(unsigned char *cdb) | |
274 | { | |
275 | return (u32)(cdb[10] << 24) + (cdb[11] << 16) + | |
276 | (cdb[12] << 8) + cdb[13]; | |
277 | } | |
278 | ||
279 | /* | |
280 | * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants | |
281 | */ | |
282 | static inline u32 transport_get_sectors_32(unsigned char *cdb) | |
283 | { | |
284 | return (u32)(cdb[28] << 24) + (cdb[29] << 16) + | |
285 | (cdb[30] << 8) + cdb[31]; | |
286 | ||
287 | } | |
288 | ||
289 | static inline u32 transport_lba_21(unsigned char *cdb) | |
290 | { | |
291 | return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3]; | |
292 | } | |
293 | ||
294 | static inline u32 transport_lba_32(unsigned char *cdb) | |
295 | { | |
296 | return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5]; | |
297 | } | |
298 | ||
299 | static inline unsigned long long transport_lba_64(unsigned char *cdb) | |
300 | { | |
301 | unsigned int __v1, __v2; | |
302 | ||
303 | __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5]; | |
304 | __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9]; | |
305 | ||
306 | return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; | |
307 | } | |
308 | ||
309 | /* | |
310 | * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs | |
311 | */ | |
312 | static inline unsigned long long transport_lba_64_ext(unsigned char *cdb) | |
313 | { | |
314 | unsigned int __v1, __v2; | |
315 | ||
316 | __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15]; | |
317 | __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19]; | |
318 | ||
319 | return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; | |
320 | } | |
321 | ||
cd063bef NB |
322 | static sense_reason_t |
323 | sbc_setup_write_same(struct se_cmd *cmd, unsigned char *flags, struct sbc_ops *ops) | |
d6e0175c | 324 | { |
8e575c50 NB |
325 | struct se_device *dev = cmd->se_dev; |
326 | sector_t end_lba = dev->transport->get_blocks(dev) + 1; | |
972b29c8 | 327 | unsigned int sectors = sbc_get_write_same_sectors(cmd); |
afd73f1b | 328 | sense_reason_t ret; |
773cbaf7 | 329 | |
d6e0175c CH |
330 | if ((flags[0] & 0x04) || (flags[0] & 0x02)) { |
331 | pr_err("WRITE_SAME PBDATA and LBDATA" | |
332 | " bits not supported for Block Discard" | |
333 | " Emulation\n"); | |
cd063bef | 334 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
d6e0175c | 335 | } |
773cbaf7 NB |
336 | if (sectors > cmd->se_dev->dev_attrib.max_write_same_len) { |
337 | pr_warn("WRITE_SAME sectors: %u exceeds max_write_same_len: %u\n", | |
338 | sectors, cmd->se_dev->dev_attrib.max_write_same_len); | |
339 | return TCM_INVALID_CDB_FIELD; | |
340 | } | |
8e575c50 NB |
341 | /* |
342 | * Sanity check for LBA wrap and request past end of device. | |
343 | */ | |
344 | if (((cmd->t_task_lba + sectors) < cmd->t_task_lba) || | |
345 | ((cmd->t_task_lba + sectors) > end_lba)) { | |
346 | pr_err("WRITE_SAME exceeds last lba %llu (lba %llu, sectors %u)\n", | |
347 | (unsigned long long)end_lba, cmd->t_task_lba, sectors); | |
348 | return TCM_ADDRESS_OUT_OF_RANGE; | |
349 | } | |
350 | ||
5cb770bf RD |
351 | /* We always have ANC_SUP == 0 so setting ANCHOR is always an error */ |
352 | if (flags[0] & 0x10) { | |
353 | pr_warn("WRITE SAME with ANCHOR not supported\n"); | |
354 | return TCM_INVALID_CDB_FIELD; | |
355 | } | |
d6e0175c | 356 | /* |
cd063bef NB |
357 | * Special case for WRITE_SAME w/ UNMAP=1 that ends up getting |
358 | * translated into block discard requests within backend code. | |
d6e0175c | 359 | */ |
cd063bef | 360 | if (flags[0] & 0x08) { |
b753d643 | 361 | if (!ops->execute_unmap) |
cd063bef NB |
362 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
363 | ||
d0a91295 NB |
364 | if (!dev->dev_attrib.emulate_tpws) { |
365 | pr_err("Got WRITE_SAME w/ UNMAP=1, but backend device" | |
366 | " has emulate_tpws disabled\n"); | |
367 | return TCM_UNSUPPORTED_SCSI_OPCODE; | |
368 | } | |
b753d643 | 369 | cmd->execute_cmd = sbc_execute_write_same_unmap; |
cd063bef | 370 | return 0; |
d6e0175c | 371 | } |
cd063bef NB |
372 | if (!ops->execute_write_same) |
373 | return TCM_UNSUPPORTED_SCSI_OPCODE; | |
d6e0175c | 374 | |
afd73f1b NB |
375 | ret = sbc_check_prot(dev, cmd, &cmd->t_task_cdb[0], sectors, true); |
376 | if (ret) | |
377 | return ret; | |
378 | ||
cd063bef | 379 | cmd->execute_cmd = ops->execute_write_same; |
d6e0175c CH |
380 | return 0; |
381 | } | |
382 | ||
057085e5 NB |
383 | static sense_reason_t xdreadwrite_callback(struct se_cmd *cmd, bool success, |
384 | int *post_ret) | |
d6e0175c CH |
385 | { |
386 | unsigned char *buf, *addr; | |
387 | struct scatterlist *sg; | |
388 | unsigned int offset; | |
a6b0133c NB |
389 | sense_reason_t ret = TCM_NO_SENSE; |
390 | int i, count; | |
d6e0175c CH |
391 | /* |
392 | * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command | |
393 | * | |
394 | * 1) read the specified logical block(s); | |
395 | * 2) transfer logical blocks from the data-out buffer; | |
396 | * 3) XOR the logical blocks transferred from the data-out buffer with | |
397 | * the logical blocks read, storing the resulting XOR data in a buffer; | |
398 | * 4) if the DISABLE WRITE bit is set to zero, then write the logical | |
399 | * blocks transferred from the data-out buffer; and | |
400 | * 5) transfer the resulting XOR data to the data-in buffer. | |
401 | */ | |
402 | buf = kmalloc(cmd->data_length, GFP_KERNEL); | |
403 | if (!buf) { | |
404 | pr_err("Unable to allocate xor_callback buf\n"); | |
a6b0133c | 405 | return TCM_OUT_OF_RESOURCES; |
d6e0175c CH |
406 | } |
407 | /* | |
408 | * Copy the scatterlist WRITE buffer located at cmd->t_data_sg | |
409 | * into the locally allocated *buf | |
410 | */ | |
411 | sg_copy_to_buffer(cmd->t_data_sg, | |
412 | cmd->t_data_nents, | |
413 | buf, | |
414 | cmd->data_length); | |
415 | ||
416 | /* | |
417 | * Now perform the XOR against the BIDI read memory located at | |
418 | * cmd->t_mem_bidi_list | |
419 | */ | |
420 | ||
421 | offset = 0; | |
422 | for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) { | |
423 | addr = kmap_atomic(sg_page(sg)); | |
a6b0133c NB |
424 | if (!addr) { |
425 | ret = TCM_OUT_OF_RESOURCES; | |
d6e0175c | 426 | goto out; |
a6b0133c | 427 | } |
d6e0175c CH |
428 | |
429 | for (i = 0; i < sg->length; i++) | |
430 | *(addr + sg->offset + i) ^= *(buf + offset + i); | |
431 | ||
432 | offset += sg->length; | |
433 | kunmap_atomic(addr); | |
434 | } | |
435 | ||
436 | out: | |
437 | kfree(buf); | |
a6b0133c | 438 | return ret; |
d6e0175c CH |
439 | } |
440 | ||
a82a9538 NB |
441 | static sense_reason_t |
442 | sbc_execute_rw(struct se_cmd *cmd) | |
443 | { | |
7a971b1b CH |
444 | struct sbc_ops *ops = cmd->protocol_data; |
445 | ||
446 | return ops->execute_rw(cmd, cmd->t_data_sg, cmd->t_data_nents, | |
a82a9538 NB |
447 | cmd->data_direction); |
448 | } | |
449 | ||
057085e5 NB |
450 | static sense_reason_t compare_and_write_post(struct se_cmd *cmd, bool success, |
451 | int *post_ret) | |
68ff9b9b NB |
452 | { |
453 | struct se_device *dev = cmd->se_dev; | |
9b2792c3 | 454 | sense_reason_t ret = TCM_NO_SENSE; |
68ff9b9b | 455 | |
d8855c15 NB |
456 | /* |
457 | * Only set SCF_COMPARE_AND_WRITE_POST to force a response fall-through | |
458 | * within target_complete_ok_work() if the command was successfully | |
459 | * sent to the backend driver. | |
460 | */ | |
461 | spin_lock_irq(&cmd->t_state_lock); | |
9b2792c3 | 462 | if (cmd->transport_state & CMD_T_SENT) { |
d8855c15 | 463 | cmd->se_cmd_flags |= SCF_COMPARE_AND_WRITE_POST; |
057085e5 | 464 | *post_ret = 1; |
9b2792c3 NB |
465 | |
466 | if (cmd->scsi_status == SAM_STAT_CHECK_CONDITION) | |
467 | ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
057085e5 | 468 | } |
d8855c15 NB |
469 | spin_unlock_irq(&cmd->t_state_lock); |
470 | ||
68ff9b9b NB |
471 | /* |
472 | * Unlock ->caw_sem originally obtained during sbc_compare_and_write() | |
473 | * before the original READ I/O submission. | |
474 | */ | |
475 | up(&dev->caw_sem); | |
476 | ||
9b2792c3 | 477 | return ret; |
68ff9b9b NB |
478 | } |
479 | ||
057085e5 NB |
480 | static sense_reason_t compare_and_write_callback(struct se_cmd *cmd, bool success, |
481 | int *post_ret) | |
68ff9b9b NB |
482 | { |
483 | struct se_device *dev = cmd->se_dev; | |
484 | struct scatterlist *write_sg = NULL, *sg; | |
db60df88 | 485 | unsigned char *buf = NULL, *addr; |
68ff9b9b NB |
486 | struct sg_mapping_iter m; |
487 | unsigned int offset = 0, len; | |
488 | unsigned int nlbas = cmd->t_task_nolb; | |
489 | unsigned int block_size = dev->dev_attrib.block_size; | |
490 | unsigned int compare_len = (nlbas * block_size); | |
491 | sense_reason_t ret = TCM_NO_SENSE; | |
492 | int rc, i; | |
493 | ||
cf6d1f09 NB |
494 | /* |
495 | * Handle early failure in transport_generic_request_failure(), | |
c8e63985 | 496 | * which will not have taken ->caw_sem yet.. |
cf6d1f09 | 497 | */ |
c8e63985 | 498 | if (!success && (!cmd->t_data_sg || !cmd->t_bidi_data_sg)) |
cf6d1f09 | 499 | return TCM_NO_SENSE; |
c8e63985 NB |
500 | /* |
501 | * Handle special case for zero-length COMPARE_AND_WRITE | |
502 | */ | |
503 | if (!cmd->data_length) | |
504 | goto out; | |
db60df88 NB |
505 | /* |
506 | * Immediately exit + release dev->caw_sem if command has already | |
507 | * been failed with a non-zero SCSI status. | |
508 | */ | |
509 | if (cmd->scsi_status) { | |
510 | pr_err("compare_and_write_callback: non zero scsi_status:" | |
511 | " 0x%02x\n", cmd->scsi_status); | |
512 | goto out; | |
513 | } | |
cf6d1f09 | 514 | |
68ff9b9b NB |
515 | buf = kzalloc(cmd->data_length, GFP_KERNEL); |
516 | if (!buf) { | |
517 | pr_err("Unable to allocate compare_and_write buf\n"); | |
a2890087 NB |
518 | ret = TCM_OUT_OF_RESOURCES; |
519 | goto out; | |
68ff9b9b NB |
520 | } |
521 | ||
a1e1774c | 522 | write_sg = kmalloc(sizeof(struct scatterlist) * cmd->t_data_nents, |
68ff9b9b NB |
523 | GFP_KERNEL); |
524 | if (!write_sg) { | |
525 | pr_err("Unable to allocate compare_and_write sg\n"); | |
526 | ret = TCM_OUT_OF_RESOURCES; | |
527 | goto out; | |
528 | } | |
a1e1774c | 529 | sg_init_table(write_sg, cmd->t_data_nents); |
68ff9b9b NB |
530 | /* |
531 | * Setup verify and write data payloads from total NumberLBAs. | |
532 | */ | |
533 | rc = sg_copy_to_buffer(cmd->t_data_sg, cmd->t_data_nents, buf, | |
534 | cmd->data_length); | |
535 | if (!rc) { | |
536 | pr_err("sg_copy_to_buffer() failed for compare_and_write\n"); | |
537 | ret = TCM_OUT_OF_RESOURCES; | |
538 | goto out; | |
539 | } | |
540 | /* | |
541 | * Compare against SCSI READ payload against verify payload | |
542 | */ | |
543 | for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, i) { | |
544 | addr = (unsigned char *)kmap_atomic(sg_page(sg)); | |
545 | if (!addr) { | |
546 | ret = TCM_OUT_OF_RESOURCES; | |
547 | goto out; | |
548 | } | |
549 | ||
550 | len = min(sg->length, compare_len); | |
551 | ||
552 | if (memcmp(addr, buf + offset, len)) { | |
553 | pr_warn("Detected MISCOMPARE for addr: %p buf: %p\n", | |
554 | addr, buf + offset); | |
555 | kunmap_atomic(addr); | |
556 | goto miscompare; | |
557 | } | |
558 | kunmap_atomic(addr); | |
559 | ||
560 | offset += len; | |
561 | compare_len -= len; | |
562 | if (!compare_len) | |
563 | break; | |
564 | } | |
565 | ||
566 | i = 0; | |
567 | len = cmd->t_task_nolb * block_size; | |
568 | sg_miter_start(&m, cmd->t_data_sg, cmd->t_data_nents, SG_MITER_TO_SG); | |
569 | /* | |
570 | * Currently assumes NoLB=1 and SGLs are PAGE_SIZE.. | |
571 | */ | |
572 | while (len) { | |
573 | sg_miter_next(&m); | |
574 | ||
575 | if (block_size < PAGE_SIZE) { | |
576 | sg_set_page(&write_sg[i], m.page, block_size, | |
d94e5a61 | 577 | m.piter.sg->offset + block_size); |
68ff9b9b NB |
578 | } else { |
579 | sg_miter_next(&m); | |
580 | sg_set_page(&write_sg[i], m.page, block_size, | |
d94e5a61 | 581 | m.piter.sg->offset); |
68ff9b9b NB |
582 | } |
583 | len -= block_size; | |
584 | i++; | |
585 | } | |
586 | sg_miter_stop(&m); | |
587 | /* | |
588 | * Save the original SGL + nents values before updating to new | |
589 | * assignments, to be released in transport_free_pages() -> | |
590 | * transport_reset_sgl_orig() | |
591 | */ | |
592 | cmd->t_data_sg_orig = cmd->t_data_sg; | |
593 | cmd->t_data_sg = write_sg; | |
594 | cmd->t_data_nents_orig = cmd->t_data_nents; | |
595 | cmd->t_data_nents = 1; | |
596 | ||
68d81f40 | 597 | cmd->sam_task_attr = TCM_HEAD_TAG; |
68ff9b9b NB |
598 | cmd->transport_complete_callback = compare_and_write_post; |
599 | /* | |
600 | * Now reset ->execute_cmd() to the normal sbc_execute_rw() handler | |
601 | * for submitting the adjusted SGL to write instance user-data. | |
602 | */ | |
603 | cmd->execute_cmd = sbc_execute_rw; | |
604 | ||
605 | spin_lock_irq(&cmd->t_state_lock); | |
606 | cmd->t_state = TRANSPORT_PROCESSING; | |
607 | cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT; | |
608 | spin_unlock_irq(&cmd->t_state_lock); | |
609 | ||
dff0ca9e | 610 | __target_execute_cmd(cmd, false); |
68ff9b9b NB |
611 | |
612 | kfree(buf); | |
613 | return ret; | |
614 | ||
615 | miscompare: | |
616 | pr_warn("Target/%s: Send MISCOMPARE check condition and sense\n", | |
617 | dev->transport->name); | |
618 | ret = TCM_MISCOMPARE_VERIFY; | |
619 | out: | |
620 | /* | |
621 | * In the MISCOMPARE or failure case, unlock ->caw_sem obtained in | |
622 | * sbc_compare_and_write() before the original READ I/O submission. | |
623 | */ | |
624 | up(&dev->caw_sem); | |
625 | kfree(write_sg); | |
626 | kfree(buf); | |
627 | return ret; | |
628 | } | |
629 | ||
630 | static sense_reason_t | |
631 | sbc_compare_and_write(struct se_cmd *cmd) | |
632 | { | |
7a971b1b | 633 | struct sbc_ops *ops = cmd->protocol_data; |
68ff9b9b NB |
634 | struct se_device *dev = cmd->se_dev; |
635 | sense_reason_t ret; | |
636 | int rc; | |
637 | /* | |
638 | * Submit the READ first for COMPARE_AND_WRITE to perform the | |
639 | * comparision using SGLs at cmd->t_bidi_data_sg.. | |
640 | */ | |
641 | rc = down_interruptible(&dev->caw_sem); | |
ee7619f2 | 642 | if (rc != 0) { |
68ff9b9b NB |
643 | cmd->transport_complete_callback = NULL; |
644 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
645 | } | |
b7191253 NB |
646 | /* |
647 | * Reset cmd->data_length to individual block_size in order to not | |
648 | * confuse backend drivers that depend on this value matching the | |
649 | * size of the I/O being submitted. | |
650 | */ | |
651 | cmd->data_length = cmd->t_task_nolb * dev->dev_attrib.block_size; | |
68ff9b9b | 652 | |
7a971b1b | 653 | ret = ops->execute_rw(cmd, cmd->t_bidi_data_sg, cmd->t_bidi_data_nents, |
68ff9b9b NB |
654 | DMA_FROM_DEVICE); |
655 | if (ret) { | |
656 | cmd->transport_complete_callback = NULL; | |
657 | up(&dev->caw_sem); | |
658 | return ret; | |
659 | } | |
660 | /* | |
661 | * Unlock of dev->caw_sem to occur in compare_and_write_callback() | |
662 | * upon MISCOMPARE, or in compare_and_write_done() upon completion | |
663 | * of WRITE instance user-data. | |
664 | */ | |
665 | return TCM_NO_SENSE; | |
666 | } | |
667 | ||
19f9361a | 668 | static int |
38b57f82 | 669 | sbc_set_prot_op_checks(u8 protect, bool fabric_prot, enum target_prot_type prot_type, |
19f9361a SG |
670 | bool is_write, struct se_cmd *cmd) |
671 | { | |
672 | if (is_write) { | |
38b57f82 NB |
673 | cmd->prot_op = fabric_prot ? TARGET_PROT_DOUT_STRIP : |
674 | protect ? TARGET_PROT_DOUT_PASS : | |
675 | TARGET_PROT_DOUT_INSERT; | |
19f9361a SG |
676 | switch (protect) { |
677 | case 0x0: | |
678 | case 0x3: | |
679 | cmd->prot_checks = 0; | |
680 | break; | |
681 | case 0x1: | |
682 | case 0x5: | |
683 | cmd->prot_checks = TARGET_DIF_CHECK_GUARD; | |
684 | if (prot_type == TARGET_DIF_TYPE1_PROT) | |
685 | cmd->prot_checks |= TARGET_DIF_CHECK_REFTAG; | |
686 | break; | |
687 | case 0x2: | |
688 | if (prot_type == TARGET_DIF_TYPE1_PROT) | |
689 | cmd->prot_checks = TARGET_DIF_CHECK_REFTAG; | |
690 | break; | |
691 | case 0x4: | |
692 | cmd->prot_checks = TARGET_DIF_CHECK_GUARD; | |
693 | break; | |
694 | default: | |
695 | pr_err("Unsupported protect field %d\n", protect); | |
696 | return -EINVAL; | |
697 | } | |
698 | } else { | |
38b57f82 NB |
699 | cmd->prot_op = fabric_prot ? TARGET_PROT_DIN_INSERT : |
700 | protect ? TARGET_PROT_DIN_PASS : | |
701 | TARGET_PROT_DIN_STRIP; | |
19f9361a SG |
702 | switch (protect) { |
703 | case 0x0: | |
704 | case 0x1: | |
705 | case 0x5: | |
706 | cmd->prot_checks = TARGET_DIF_CHECK_GUARD; | |
707 | if (prot_type == TARGET_DIF_TYPE1_PROT) | |
708 | cmd->prot_checks |= TARGET_DIF_CHECK_REFTAG; | |
709 | break; | |
710 | case 0x2: | |
711 | if (prot_type == TARGET_DIF_TYPE1_PROT) | |
712 | cmd->prot_checks = TARGET_DIF_CHECK_REFTAG; | |
713 | break; | |
714 | case 0x3: | |
715 | cmd->prot_checks = 0; | |
716 | break; | |
717 | case 0x4: | |
718 | cmd->prot_checks = TARGET_DIF_CHECK_GUARD; | |
719 | break; | |
720 | default: | |
721 | pr_err("Unsupported protect field %d\n", protect); | |
722 | return -EINVAL; | |
723 | } | |
724 | } | |
725 | ||
726 | return 0; | |
727 | } | |
728 | ||
f7b7c06f | 729 | static sense_reason_t |
499bf77b | 730 | sbc_check_prot(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb, |
19f9361a | 731 | u32 sectors, bool is_write) |
499bf77b | 732 | { |
19f9361a | 733 | u8 protect = cdb[1] >> 5; |
38b57f82 NB |
734 | int sp_ops = cmd->se_sess->sup_prot_ops; |
735 | int pi_prot_type = dev->dev_attrib.pi_prot_type; | |
736 | bool fabric_prot = false; | |
19f9361a | 737 | |
f7b7c06f | 738 | if (!cmd->t_prot_sg || !cmd->t_prot_nents) { |
38b57f82 NB |
739 | if (unlikely(protect && |
740 | !dev->dev_attrib.pi_prot_type && !cmd->se_sess->sess_prot_type)) { | |
741 | pr_err("CDB contains protect bit, but device + fabric does" | |
742 | " not advertise PROTECT=1 feature bit\n"); | |
f7b7c06f NB |
743 | return TCM_INVALID_CDB_FIELD; |
744 | } | |
745 | if (cmd->prot_pto) | |
746 | return TCM_NO_SENSE; | |
747 | } | |
499bf77b NB |
748 | |
749 | switch (dev->dev_attrib.pi_prot_type) { | |
750 | case TARGET_DIF_TYPE3_PROT: | |
499bf77b NB |
751 | cmd->reftag_seed = 0xffffffff; |
752 | break; | |
753 | case TARGET_DIF_TYPE2_PROT: | |
19f9361a | 754 | if (protect) |
f7b7c06f | 755 | return TCM_INVALID_CDB_FIELD; |
499bf77b NB |
756 | |
757 | cmd->reftag_seed = cmd->t_task_lba; | |
758 | break; | |
759 | case TARGET_DIF_TYPE1_PROT: | |
499bf77b NB |
760 | cmd->reftag_seed = cmd->t_task_lba; |
761 | break; | |
762 | case TARGET_DIF_TYPE0_PROT: | |
38b57f82 NB |
763 | /* |
764 | * See if the fabric supports T10-PI, and the session has been | |
765 | * configured to allow export PROTECT=1 feature bit with backend | |
766 | * devices that don't support T10-PI. | |
767 | */ | |
768 | fabric_prot = is_write ? | |
769 | !!(sp_ops & (TARGET_PROT_DOUT_PASS | TARGET_PROT_DOUT_STRIP)) : | |
770 | !!(sp_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DIN_INSERT)); | |
771 | ||
772 | if (fabric_prot && cmd->se_sess->sess_prot_type) { | |
773 | pi_prot_type = cmd->se_sess->sess_prot_type; | |
774 | break; | |
775 | } | |
cceca4a6 NB |
776 | if (!protect) |
777 | return TCM_NO_SENSE; | |
38b57f82 | 778 | /* Fallthrough */ |
499bf77b | 779 | default: |
cceca4a6 NB |
780 | pr_err("Unable to determine pi_prot_type for CDB: 0x%02x " |
781 | "PROTECT: 0x%02x\n", cdb[0], protect); | |
782 | return TCM_INVALID_CDB_FIELD; | |
499bf77b NB |
783 | } |
784 | ||
38b57f82 | 785 | if (sbc_set_prot_op_checks(protect, fabric_prot, pi_prot_type, is_write, cmd)) |
f7b7c06f | 786 | return TCM_INVALID_CDB_FIELD; |
19f9361a | 787 | |
38b57f82 | 788 | cmd->prot_type = pi_prot_type; |
499bf77b | 789 | cmd->prot_length = dev->prot_length * sectors; |
e2a4f55c SG |
790 | |
791 | /** | |
792 | * In case protection information exists over the wire | |
793 | * we modify command data length to describe pure data. | |
794 | * The actual transfer length is data length + protection | |
795 | * length | |
796 | **/ | |
797 | if (protect) | |
798 | cmd->data_length = sectors * dev->dev_attrib.block_size; | |
799 | ||
800 | pr_debug("%s: prot_type=%d, data_length=%d, prot_length=%d " | |
801 | "prot_op=%d prot_checks=%d\n", | |
802 | __func__, cmd->prot_type, cmd->data_length, cmd->prot_length, | |
03abad9e | 803 | cmd->prot_op, cmd->prot_checks); |
499bf77b | 804 | |
f7b7c06f | 805 | return TCM_NO_SENSE; |
499bf77b NB |
806 | } |
807 | ||
fde9f50f NB |
808 | static int |
809 | sbc_check_dpofua(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb) | |
810 | { | |
811 | if (cdb[1] & 0x10) { | |
814e5b45 CH |
812 | /* see explanation in spc_emulate_modesense */ |
813 | if (!target_check_fua(dev)) { | |
fde9f50f NB |
814 | pr_err("Got CDB: 0x%02x with DPO bit set, but device" |
815 | " does not advertise support for DPO\n", cdb[0]); | |
816 | return -EINVAL; | |
817 | } | |
818 | } | |
819 | if (cdb[1] & 0x8) { | |
814e5b45 | 820 | if (!target_check_fua(dev)) { |
fde9f50f NB |
821 | pr_err("Got CDB: 0x%02x with FUA bit set, but device" |
822 | " does not advertise support for FUA write\n", | |
823 | cdb[0]); | |
824 | return -EINVAL; | |
825 | } | |
826 | cmd->se_cmd_flags |= SCF_FUA; | |
827 | } | |
828 | return 0; | |
499bf77b NB |
829 | } |
830 | ||
de103c93 CH |
831 | sense_reason_t |
832 | sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops) | |
d6e0175c | 833 | { |
d6e0175c CH |
834 | struct se_device *dev = cmd->se_dev; |
835 | unsigned char *cdb = cmd->t_task_cdb; | |
1fd032ee | 836 | unsigned int size; |
d6e0175c | 837 | u32 sectors = 0; |
de103c93 | 838 | sense_reason_t ret; |
d6e0175c | 839 | |
7a971b1b CH |
840 | cmd->protocol_data = ops; |
841 | ||
d6e0175c CH |
842 | switch (cdb[0]) { |
843 | case READ_6: | |
844 | sectors = transport_get_sectors_6(cdb); | |
845 | cmd->t_task_lba = transport_lba_21(cdb); | |
846 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
a82a9538 | 847 | cmd->execute_cmd = sbc_execute_rw; |
d6e0175c CH |
848 | break; |
849 | case READ_10: | |
850 | sectors = transport_get_sectors_10(cdb); | |
851 | cmd->t_task_lba = transport_lba_32(cdb); | |
499bf77b | 852 | |
fde9f50f NB |
853 | if (sbc_check_dpofua(dev, cmd, cdb)) |
854 | return TCM_INVALID_CDB_FIELD; | |
855 | ||
f7b7c06f NB |
856 | ret = sbc_check_prot(dev, cmd, cdb, sectors, false); |
857 | if (ret) | |
858 | return ret; | |
499bf77b | 859 | |
d6e0175c | 860 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
a82a9538 | 861 | cmd->execute_cmd = sbc_execute_rw; |
d6e0175c CH |
862 | break; |
863 | case READ_12: | |
864 | sectors = transport_get_sectors_12(cdb); | |
865 | cmd->t_task_lba = transport_lba_32(cdb); | |
499bf77b | 866 | |
fde9f50f NB |
867 | if (sbc_check_dpofua(dev, cmd, cdb)) |
868 | return TCM_INVALID_CDB_FIELD; | |
869 | ||
f7b7c06f NB |
870 | ret = sbc_check_prot(dev, cmd, cdb, sectors, false); |
871 | if (ret) | |
872 | return ret; | |
499bf77b | 873 | |
d6e0175c | 874 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
a82a9538 | 875 | cmd->execute_cmd = sbc_execute_rw; |
d6e0175c CH |
876 | break; |
877 | case READ_16: | |
878 | sectors = transport_get_sectors_16(cdb); | |
879 | cmd->t_task_lba = transport_lba_64(cdb); | |
499bf77b | 880 | |
fde9f50f NB |
881 | if (sbc_check_dpofua(dev, cmd, cdb)) |
882 | return TCM_INVALID_CDB_FIELD; | |
883 | ||
f7b7c06f NB |
884 | ret = sbc_check_prot(dev, cmd, cdb, sectors, false); |
885 | if (ret) | |
886 | return ret; | |
499bf77b | 887 | |
d6e0175c | 888 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
a82a9538 | 889 | cmd->execute_cmd = sbc_execute_rw; |
d6e0175c CH |
890 | break; |
891 | case WRITE_6: | |
892 | sectors = transport_get_sectors_6(cdb); | |
893 | cmd->t_task_lba = transport_lba_21(cdb); | |
894 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
a82a9538 | 895 | cmd->execute_cmd = sbc_execute_rw; |
d6e0175c CH |
896 | break; |
897 | case WRITE_10: | |
898 | case WRITE_VERIFY: | |
899 | sectors = transport_get_sectors_10(cdb); | |
900 | cmd->t_task_lba = transport_lba_32(cdb); | |
499bf77b | 901 | |
fde9f50f NB |
902 | if (sbc_check_dpofua(dev, cmd, cdb)) |
903 | return TCM_INVALID_CDB_FIELD; | |
904 | ||
f7b7c06f NB |
905 | ret = sbc_check_prot(dev, cmd, cdb, sectors, true); |
906 | if (ret) | |
907 | return ret; | |
499bf77b | 908 | |
d6e0175c | 909 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
a82a9538 | 910 | cmd->execute_cmd = sbc_execute_rw; |
d6e0175c CH |
911 | break; |
912 | case WRITE_12: | |
913 | sectors = transport_get_sectors_12(cdb); | |
914 | cmd->t_task_lba = transport_lba_32(cdb); | |
499bf77b | 915 | |
fde9f50f NB |
916 | if (sbc_check_dpofua(dev, cmd, cdb)) |
917 | return TCM_INVALID_CDB_FIELD; | |
918 | ||
f7b7c06f NB |
919 | ret = sbc_check_prot(dev, cmd, cdb, sectors, true); |
920 | if (ret) | |
921 | return ret; | |
499bf77b | 922 | |
d6e0175c | 923 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
a82a9538 | 924 | cmd->execute_cmd = sbc_execute_rw; |
d6e0175c CH |
925 | break; |
926 | case WRITE_16: | |
927 | sectors = transport_get_sectors_16(cdb); | |
928 | cmd->t_task_lba = transport_lba_64(cdb); | |
499bf77b | 929 | |
fde9f50f NB |
930 | if (sbc_check_dpofua(dev, cmd, cdb)) |
931 | return TCM_INVALID_CDB_FIELD; | |
932 | ||
f7b7c06f NB |
933 | ret = sbc_check_prot(dev, cmd, cdb, sectors, true); |
934 | if (ret) | |
935 | return ret; | |
499bf77b | 936 | |
d6e0175c | 937 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
a82a9538 | 938 | cmd->execute_cmd = sbc_execute_rw; |
d6e0175c CH |
939 | break; |
940 | case XDWRITEREAD_10: | |
de103c93 | 941 | if (cmd->data_direction != DMA_TO_DEVICE || |
d6e0175c | 942 | !(cmd->se_cmd_flags & SCF_BIDI)) |
de103c93 | 943 | return TCM_INVALID_CDB_FIELD; |
d6e0175c CH |
944 | sectors = transport_get_sectors_10(cdb); |
945 | ||
fde9f50f NB |
946 | if (sbc_check_dpofua(dev, cmd, cdb)) |
947 | return TCM_INVALID_CDB_FIELD; | |
948 | ||
d6e0175c CH |
949 | cmd->t_task_lba = transport_lba_32(cdb); |
950 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
951 | ||
952 | /* | |
953 | * Setup BIDI XOR callback to be run after I/O completion. | |
954 | */ | |
a82a9538 | 955 | cmd->execute_cmd = sbc_execute_rw; |
d6e0175c | 956 | cmd->transport_complete_callback = &xdreadwrite_callback; |
d6e0175c CH |
957 | break; |
958 | case VARIABLE_LENGTH_CMD: | |
959 | { | |
960 | u16 service_action = get_unaligned_be16(&cdb[8]); | |
961 | switch (service_action) { | |
962 | case XDWRITEREAD_32: | |
963 | sectors = transport_get_sectors_32(cdb); | |
964 | ||
fde9f50f NB |
965 | if (sbc_check_dpofua(dev, cmd, cdb)) |
966 | return TCM_INVALID_CDB_FIELD; | |
d6e0175c CH |
967 | /* |
968 | * Use WRITE_32 and READ_32 opcodes for the emulated | |
969 | * XDWRITE_READ_32 logic. | |
970 | */ | |
971 | cmd->t_task_lba = transport_lba_64_ext(cdb); | |
972 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
973 | ||
974 | /* | |
975 | * Setup BIDI XOR callback to be run during after I/O | |
976 | * completion. | |
977 | */ | |
a82a9538 | 978 | cmd->execute_cmd = sbc_execute_rw; |
d6e0175c | 979 | cmd->transport_complete_callback = &xdreadwrite_callback; |
d6e0175c CH |
980 | break; |
981 | case WRITE_SAME_32: | |
982 | sectors = transport_get_sectors_32(cdb); | |
983 | if (!sectors) { | |
984 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not" | |
985 | " supported\n"); | |
de103c93 | 986 | return TCM_INVALID_CDB_FIELD; |
d6e0175c CH |
987 | } |
988 | ||
1fd032ee | 989 | size = sbc_get_size(cmd, 1); |
d6e0175c CH |
990 | cmd->t_task_lba = get_unaligned_be64(&cdb[12]); |
991 | ||
cd063bef | 992 | ret = sbc_setup_write_same(cmd, &cdb[10], ops); |
6b64e1fe | 993 | if (ret) |
cd063bef | 994 | return ret; |
d6e0175c CH |
995 | break; |
996 | default: | |
997 | pr_err("VARIABLE_LENGTH_CMD service action" | |
998 | " 0x%04x not supported\n", service_action); | |
de103c93 | 999 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
d6e0175c CH |
1000 | } |
1001 | break; | |
1002 | } | |
68ff9b9b NB |
1003 | case COMPARE_AND_WRITE: |
1004 | sectors = cdb[13]; | |
1005 | /* | |
1006 | * Currently enforce COMPARE_AND_WRITE for a single sector | |
1007 | */ | |
1008 | if (sectors > 1) { | |
1009 | pr_err("COMPARE_AND_WRITE contains NoLB: %u greater" | |
1010 | " than 1\n", sectors); | |
1011 | return TCM_INVALID_CDB_FIELD; | |
1012 | } | |
ab81a5e0 DD |
1013 | if (sbc_check_dpofua(dev, cmd, cdb)) |
1014 | return TCM_INVALID_CDB_FIELD; | |
1015 | ||
68ff9b9b NB |
1016 | /* |
1017 | * Double size because we have two buffers, note that | |
1018 | * zero is not an error.. | |
1019 | */ | |
1020 | size = 2 * sbc_get_size(cmd, sectors); | |
1021 | cmd->t_task_lba = get_unaligned_be64(&cdb[2]); | |
1022 | cmd->t_task_nolb = sectors; | |
1023 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB | SCF_COMPARE_AND_WRITE; | |
68ff9b9b NB |
1024 | cmd->execute_cmd = sbc_compare_and_write; |
1025 | cmd->transport_complete_callback = compare_and_write_callback; | |
1026 | break; | |
d6e0175c | 1027 | case READ_CAPACITY: |
1fd032ee CH |
1028 | size = READ_CAP_LEN; |
1029 | cmd->execute_cmd = sbc_emulate_readcapacity; | |
d6e0175c | 1030 | break; |
eb846d9f | 1031 | case SERVICE_ACTION_IN_16: |
d6e0175c CH |
1032 | switch (cmd->t_task_cdb[1] & 0x1f) { |
1033 | case SAI_READ_CAPACITY_16: | |
1fd032ee | 1034 | cmd->execute_cmd = sbc_emulate_readcapacity_16; |
d6e0175c | 1035 | break; |
c66094bf HR |
1036 | case SAI_REPORT_REFERRALS: |
1037 | cmd->execute_cmd = target_emulate_report_referrals; | |
1038 | break; | |
d6e0175c CH |
1039 | default: |
1040 | pr_err("Unsupported SA: 0x%02x\n", | |
1041 | cmd->t_task_cdb[1] & 0x1f); | |
de103c93 | 1042 | return TCM_INVALID_CDB_FIELD; |
d6e0175c | 1043 | } |
1fd032ee | 1044 | size = (cdb[10] << 24) | (cdb[11] << 16) | |
d6e0175c CH |
1045 | (cdb[12] << 8) | cdb[13]; |
1046 | break; | |
1047 | case SYNCHRONIZE_CACHE: | |
1048 | case SYNCHRONIZE_CACHE_16: | |
d6e0175c CH |
1049 | if (cdb[0] == SYNCHRONIZE_CACHE) { |
1050 | sectors = transport_get_sectors_10(cdb); | |
1051 | cmd->t_task_lba = transport_lba_32(cdb); | |
1052 | } else { | |
1053 | sectors = transport_get_sectors_16(cdb); | |
1054 | cmd->t_task_lba = transport_lba_64(cdb); | |
1055 | } | |
6ef31dc7 CVB |
1056 | if (ops->execute_sync_cache) { |
1057 | cmd->execute_cmd = ops->execute_sync_cache; | |
1058 | goto check_lba; | |
d6e0175c | 1059 | } |
6ef31dc7 CVB |
1060 | size = 0; |
1061 | cmd->execute_cmd = sbc_emulate_noop; | |
d6e0175c CH |
1062 | break; |
1063 | case UNMAP: | |
14150a6b | 1064 | if (!ops->execute_unmap) |
de103c93 | 1065 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
14150a6b | 1066 | |
61fdb4ac NB |
1067 | if (!dev->dev_attrib.emulate_tpu) { |
1068 | pr_err("Got UNMAP, but backend device has" | |
1069 | " emulate_tpu disabled\n"); | |
1070 | return TCM_UNSUPPORTED_SCSI_OPCODE; | |
1071 | } | |
1fd032ee | 1072 | size = get_unaligned_be16(&cdb[7]); |
62e46942 | 1073 | cmd->execute_cmd = sbc_execute_unmap; |
d6e0175c CH |
1074 | break; |
1075 | case WRITE_SAME_16: | |
1076 | sectors = transport_get_sectors_16(cdb); | |
1077 | if (!sectors) { | |
1078 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); | |
de103c93 | 1079 | return TCM_INVALID_CDB_FIELD; |
d6e0175c CH |
1080 | } |
1081 | ||
1fd032ee | 1082 | size = sbc_get_size(cmd, 1); |
d6e0175c CH |
1083 | cmd->t_task_lba = get_unaligned_be64(&cdb[2]); |
1084 | ||
cd063bef | 1085 | ret = sbc_setup_write_same(cmd, &cdb[1], ops); |
6b64e1fe | 1086 | if (ret) |
cd063bef | 1087 | return ret; |
d6e0175c CH |
1088 | break; |
1089 | case WRITE_SAME: | |
1090 | sectors = transport_get_sectors_10(cdb); | |
1091 | if (!sectors) { | |
1092 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); | |
de103c93 | 1093 | return TCM_INVALID_CDB_FIELD; |
d6e0175c CH |
1094 | } |
1095 | ||
1fd032ee | 1096 | size = sbc_get_size(cmd, 1); |
d6e0175c CH |
1097 | cmd->t_task_lba = get_unaligned_be32(&cdb[2]); |
1098 | ||
1099 | /* | |
1100 | * Follow sbcr26 with WRITE_SAME (10) and check for the existence | |
1101 | * of byte 1 bit 3 UNMAP instead of original reserved field | |
1102 | */ | |
cd063bef | 1103 | ret = sbc_setup_write_same(cmd, &cdb[1], ops); |
6b64e1fe | 1104 | if (ret) |
cd063bef | 1105 | return ret; |
d6e0175c CH |
1106 | break; |
1107 | case VERIFY: | |
0bcf0a2d | 1108 | case VERIFY_16: |
1fd032ee | 1109 | size = 0; |
0bcf0a2d ML |
1110 | if (cdb[0] == VERIFY) { |
1111 | sectors = transport_get_sectors_10(cdb); | |
1112 | cmd->t_task_lba = transport_lba_32(cdb); | |
1113 | } else { | |
1114 | sectors = transport_get_sectors_16(cdb); | |
1115 | cmd->t_task_lba = transport_lba_64(cdb); | |
1116 | } | |
1920ed61 | 1117 | cmd->execute_cmd = sbc_emulate_noop; |
c52716de | 1118 | goto check_lba; |
1a1ff38c BK |
1119 | case REZERO_UNIT: |
1120 | case SEEK_6: | |
1121 | case SEEK_10: | |
1122 | /* | |
1123 | * There are still clients out there which use these old SCSI-2 | |
1124 | * commands. This mainly happens when running VMs with legacy | |
1125 | * guest systems, connected via SCSI command pass-through to | |
1126 | * iSCSI targets. Make them happy and return status GOOD. | |
1127 | */ | |
1128 | size = 0; | |
1129 | cmd->execute_cmd = sbc_emulate_noop; | |
1130 | break; | |
45182ed5 BB |
1131 | case START_STOP: |
1132 | size = 0; | |
1133 | cmd->execute_cmd = sbc_emulate_startstop; | |
1134 | break; | |
d6e0175c | 1135 | default: |
1fd032ee | 1136 | ret = spc_parse_cdb(cmd, &size); |
d6e0175c CH |
1137 | if (ret) |
1138 | return ret; | |
1139 | } | |
1140 | ||
1141 | /* reject any command that we don't have a handler for */ | |
20959c4b | 1142 | if (!cmd->execute_cmd) |
de103c93 | 1143 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
d6e0175c CH |
1144 | |
1145 | if (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) { | |
1fd032ee | 1146 | unsigned long long end_lba; |
6ef31dc7 | 1147 | check_lba: |
1fd032ee | 1148 | end_lba = dev->transport->get_blocks(dev) + 1; |
aa179935 NB |
1149 | if (((cmd->t_task_lba + sectors) < cmd->t_task_lba) || |
1150 | ((cmd->t_task_lba + sectors) > end_lba)) { | |
1fd032ee CH |
1151 | pr_err("cmd exceeds last lba %llu " |
1152 | "(lba %llu, sectors %u)\n", | |
1153 | end_lba, cmd->t_task_lba, sectors); | |
09ceadc7 | 1154 | return TCM_ADDRESS_OUT_OF_RANGE; |
1fd032ee CH |
1155 | } |
1156 | ||
68ff9b9b NB |
1157 | if (!(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) |
1158 | size = sbc_get_size(cmd, sectors); | |
d6e0175c CH |
1159 | } |
1160 | ||
de103c93 | 1161 | return target_cmd_size_check(cmd, size); |
d6e0175c CH |
1162 | } |
1163 | EXPORT_SYMBOL(sbc_parse_cdb); | |
6f23ac8a | 1164 | |
6f23ac8a CH |
1165 | u32 sbc_get_device_type(struct se_device *dev) |
1166 | { | |
1167 | return TYPE_DISK; | |
1168 | } | |
1169 | EXPORT_SYMBOL(sbc_get_device_type); | |
86d71829 | 1170 | |
62e46942 CH |
1171 | static sense_reason_t |
1172 | sbc_execute_unmap(struct se_cmd *cmd) | |
86d71829 | 1173 | { |
62e46942 | 1174 | struct sbc_ops *ops = cmd->protocol_data; |
86d71829 AH |
1175 | struct se_device *dev = cmd->se_dev; |
1176 | unsigned char *buf, *ptr = NULL; | |
1177 | sector_t lba; | |
1178 | int size; | |
1179 | u32 range; | |
1180 | sense_reason_t ret = 0; | |
1181 | int dl, bd_dl; | |
1182 | ||
1183 | /* We never set ANC_SUP */ | |
1184 | if (cmd->t_task_cdb[1]) | |
1185 | return TCM_INVALID_CDB_FIELD; | |
1186 | ||
1187 | if (cmd->data_length == 0) { | |
1188 | target_complete_cmd(cmd, SAM_STAT_GOOD); | |
1189 | return 0; | |
1190 | } | |
1191 | ||
1192 | if (cmd->data_length < 8) { | |
1193 | pr_warn("UNMAP parameter list length %u too small\n", | |
1194 | cmd->data_length); | |
1195 | return TCM_PARAMETER_LIST_LENGTH_ERROR; | |
1196 | } | |
1197 | ||
1198 | buf = transport_kmap_data_sg(cmd); | |
1199 | if (!buf) | |
1200 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
1201 | ||
1202 | dl = get_unaligned_be16(&buf[0]); | |
1203 | bd_dl = get_unaligned_be16(&buf[2]); | |
1204 | ||
1205 | size = cmd->data_length - 8; | |
1206 | if (bd_dl > size) | |
1207 | pr_warn("UNMAP parameter list length %u too small, ignoring bd_dl %u\n", | |
1208 | cmd->data_length, bd_dl); | |
1209 | else | |
1210 | size = bd_dl; | |
1211 | ||
1212 | if (size / 16 > dev->dev_attrib.max_unmap_block_desc_count) { | |
1213 | ret = TCM_INVALID_PARAMETER_LIST; | |
1214 | goto err; | |
1215 | } | |
1216 | ||
1217 | /* First UNMAP block descriptor starts at 8 byte offset */ | |
1218 | ptr = &buf[8]; | |
1219 | pr_debug("UNMAP: Sub: %s Using dl: %u bd_dl: %u size: %u" | |
1220 | " ptr: %p\n", dev->transport->name, dl, bd_dl, size, ptr); | |
1221 | ||
1222 | while (size >= 16) { | |
1223 | lba = get_unaligned_be64(&ptr[0]); | |
1224 | range = get_unaligned_be32(&ptr[8]); | |
1225 | pr_debug("UNMAP: Using lba: %llu and range: %u\n", | |
1226 | (unsigned long long)lba, range); | |
1227 | ||
1228 | if (range > dev->dev_attrib.max_unmap_lba_count) { | |
1229 | ret = TCM_INVALID_PARAMETER_LIST; | |
1230 | goto err; | |
1231 | } | |
1232 | ||
1233 | if (lba + range > dev->transport->get_blocks(dev) + 1) { | |
1234 | ret = TCM_ADDRESS_OUT_OF_RANGE; | |
1235 | goto err; | |
1236 | } | |
1237 | ||
62e46942 | 1238 | ret = ops->execute_unmap(cmd, lba, range); |
86d71829 AH |
1239 | if (ret) |
1240 | goto err; | |
1241 | ||
1242 | ptr += 16; | |
1243 | size -= 16; | |
1244 | } | |
1245 | ||
1246 | err: | |
1247 | transport_kunmap_data_sg(cmd); | |
1248 | if (!ret) | |
1249 | target_complete_cmd(cmd, GOOD); | |
1250 | return ret; | |
1251 | } | |
41861fa8 | 1252 | |
66a3d5bc NB |
1253 | void |
1254 | sbc_dif_generate(struct se_cmd *cmd) | |
1255 | { | |
1256 | struct se_device *dev = cmd->se_dev; | |
fe052a18 | 1257 | struct t10_pi_tuple *sdt; |
18213afb | 1258 | struct scatterlist *dsg = cmd->t_data_sg, *psg; |
66a3d5bc NB |
1259 | sector_t sector = cmd->t_task_lba; |
1260 | void *daddr, *paddr; | |
1261 | int i, j, offset = 0; | |
18213afb | 1262 | unsigned int block_size = dev->dev_attrib.block_size; |
66a3d5bc | 1263 | |
18213afb | 1264 | for_each_sg(cmd->t_prot_sg, psg, cmd->t_prot_nents, i) { |
66a3d5bc | 1265 | paddr = kmap_atomic(sg_page(psg)) + psg->offset; |
18213afb | 1266 | daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; |
66a3d5bc | 1267 | |
18213afb | 1268 | for (j = 0; j < psg->length; |
fe052a18 | 1269 | j += sizeof(*sdt)) { |
18213afb AM |
1270 | __u16 crc; |
1271 | unsigned int avail; | |
66a3d5bc | 1272 | |
18213afb AM |
1273 | if (offset >= dsg->length) { |
1274 | offset -= dsg->length; | |
1275 | kunmap_atomic(daddr - dsg->offset); | |
1276 | dsg = sg_next(dsg); | |
1277 | if (!dsg) { | |
1278 | kunmap_atomic(paddr - psg->offset); | |
1279 | return; | |
1280 | } | |
1281 | daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; | |
66a3d5bc | 1282 | } |
66a3d5bc | 1283 | |
18213afb AM |
1284 | sdt = paddr + j; |
1285 | avail = min(block_size, dsg->length - offset); | |
1286 | crc = crc_t10dif(daddr + offset, avail); | |
1287 | if (avail < block_size) { | |
1288 | kunmap_atomic(daddr - dsg->offset); | |
1289 | dsg = sg_next(dsg); | |
1290 | if (!dsg) { | |
1291 | kunmap_atomic(paddr - psg->offset); | |
1292 | return; | |
1293 | } | |
1294 | daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; | |
1295 | offset = block_size - avail; | |
1296 | crc = crc_t10dif_update(crc, daddr, offset); | |
1297 | } else { | |
1298 | offset += block_size; | |
66a3d5bc NB |
1299 | } |
1300 | ||
18213afb | 1301 | sdt->guard_tag = cpu_to_be16(crc); |
823ddd87 | 1302 | if (cmd->prot_type == TARGET_DIF_TYPE1_PROT) |
66a3d5bc NB |
1303 | sdt->ref_tag = cpu_to_be32(sector & 0xffffffff); |
1304 | sdt->app_tag = 0; | |
1305 | ||
6ae50408 | 1306 | pr_debug("DIF %s INSERT sector: %llu guard_tag: 0x%04x" |
66a3d5bc | 1307 | " app_tag: 0x%04x ref_tag: %u\n", |
6ae50408 NB |
1308 | (cmd->data_direction == DMA_TO_DEVICE) ? |
1309 | "WRITE" : "READ", (unsigned long long)sector, | |
1310 | sdt->guard_tag, sdt->app_tag, | |
1311 | be32_to_cpu(sdt->ref_tag)); | |
66a3d5bc NB |
1312 | |
1313 | sector++; | |
66a3d5bc NB |
1314 | } |
1315 | ||
18213afb AM |
1316 | kunmap_atomic(daddr - dsg->offset); |
1317 | kunmap_atomic(paddr - psg->offset); | |
66a3d5bc NB |
1318 | } |
1319 | } | |
1320 | ||
41861fa8 | 1321 | static sense_reason_t |
fe052a18 | 1322 | sbc_dif_v1_verify(struct se_cmd *cmd, struct t10_pi_tuple *sdt, |
18213afb | 1323 | __u16 crc, sector_t sector, unsigned int ei_lba) |
41861fa8 | 1324 | { |
41861fa8 NB |
1325 | __be16 csum; |
1326 | ||
d7a463b0 NB |
1327 | if (!(cmd->prot_checks & TARGET_DIF_CHECK_GUARD)) |
1328 | goto check_ref; | |
1329 | ||
18213afb | 1330 | csum = cpu_to_be16(crc); |
41861fa8 NB |
1331 | |
1332 | if (sdt->guard_tag != csum) { | |
1333 | pr_err("DIFv1 checksum failed on sector %llu guard tag 0x%04x" | |
1334 | " csum 0x%04x\n", (unsigned long long)sector, | |
1335 | be16_to_cpu(sdt->guard_tag), be16_to_cpu(csum)); | |
1336 | return TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED; | |
1337 | } | |
1338 | ||
d7a463b0 NB |
1339 | check_ref: |
1340 | if (!(cmd->prot_checks & TARGET_DIF_CHECK_REFTAG)) | |
1341 | return 0; | |
1342 | ||
823ddd87 | 1343 | if (cmd->prot_type == TARGET_DIF_TYPE1_PROT && |
41861fa8 NB |
1344 | be32_to_cpu(sdt->ref_tag) != (sector & 0xffffffff)) { |
1345 | pr_err("DIFv1 Type 1 reference failed on sector: %llu tag: 0x%08x" | |
1346 | " sector MSB: 0x%08x\n", (unsigned long long)sector, | |
1347 | be32_to_cpu(sdt->ref_tag), (u32)(sector & 0xffffffff)); | |
1348 | return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED; | |
1349 | } | |
1350 | ||
823ddd87 | 1351 | if (cmd->prot_type == TARGET_DIF_TYPE2_PROT && |
41861fa8 NB |
1352 | be32_to_cpu(sdt->ref_tag) != ei_lba) { |
1353 | pr_err("DIFv1 Type 2 reference failed on sector: %llu tag: 0x%08x" | |
1354 | " ei_lba: 0x%08x\n", (unsigned long long)sector, | |
1355 | be32_to_cpu(sdt->ref_tag), ei_lba); | |
1356 | return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED; | |
1357 | } | |
1358 | ||
1359 | return 0; | |
1360 | } | |
1361 | ||
f75b6fae SG |
1362 | void sbc_dif_copy_prot(struct se_cmd *cmd, unsigned int sectors, bool read, |
1363 | struct scatterlist *sg, int sg_off) | |
41861fa8 NB |
1364 | { |
1365 | struct se_device *dev = cmd->se_dev; | |
1366 | struct scatterlist *psg; | |
1367 | void *paddr, *addr; | |
1368 | unsigned int i, len, left; | |
10762e80 | 1369 | unsigned int offset = sg_off; |
41861fa8 | 1370 | |
38b57f82 NB |
1371 | if (!sg) |
1372 | return; | |
1373 | ||
41861fa8 NB |
1374 | left = sectors * dev->prot_length; |
1375 | ||
1376 | for_each_sg(cmd->t_prot_sg, psg, cmd->t_prot_nents, i) { | |
16c0ae02 | 1377 | unsigned int psg_len, copied = 0; |
d6a65fdc | 1378 | |
41861fa8 | 1379 | paddr = kmap_atomic(sg_page(psg)) + psg->offset; |
16c0ae02 SG |
1380 | psg_len = min(left, psg->length); |
1381 | while (psg_len) { | |
1382 | len = min(psg_len, sg->length - offset); | |
1383 | addr = kmap_atomic(sg_page(sg)) + sg->offset + offset; | |
1384 | ||
1385 | if (read) | |
1386 | memcpy(paddr + copied, addr, len); | |
1387 | else | |
1388 | memcpy(addr, paddr + copied, len); | |
1389 | ||
1390 | left -= len; | |
1391 | offset += len; | |
1392 | copied += len; | |
1393 | psg_len -= len; | |
1394 | ||
57636388 AM |
1395 | kunmap_atomic(addr - sg->offset - offset); |
1396 | ||
16c0ae02 SG |
1397 | if (offset >= sg->length) { |
1398 | sg = sg_next(sg); | |
1399 | offset = 0; | |
1400 | } | |
16c0ae02 | 1401 | } |
57636388 | 1402 | kunmap_atomic(paddr - psg->offset); |
41861fa8 NB |
1403 | } |
1404 | } | |
f75b6fae | 1405 | EXPORT_SYMBOL(sbc_dif_copy_prot); |
41861fa8 NB |
1406 | |
1407 | sense_reason_t | |
f75b6fae | 1408 | sbc_dif_verify(struct se_cmd *cmd, sector_t start, unsigned int sectors, |
414e4627 | 1409 | unsigned int ei_lba, struct scatterlist *psg, int psg_off) |
41861fa8 NB |
1410 | { |
1411 | struct se_device *dev = cmd->se_dev; | |
fe052a18 | 1412 | struct t10_pi_tuple *sdt; |
18213afb | 1413 | struct scatterlist *dsg = cmd->t_data_sg; |
41861fa8 NB |
1414 | sector_t sector = start; |
1415 | void *daddr, *paddr; | |
18213afb | 1416 | int i; |
41861fa8 | 1417 | sense_reason_t rc; |
18213afb AM |
1418 | int dsg_off = 0; |
1419 | unsigned int block_size = dev->dev_attrib.block_size; | |
41861fa8 | 1420 | |
18213afb | 1421 | for (; psg && sector < start + sectors; psg = sg_next(psg)) { |
41861fa8 | 1422 | paddr = kmap_atomic(sg_page(psg)) + psg->offset; |
41861fa8 | 1423 | daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; |
41861fa8 | 1424 | |
18213afb AM |
1425 | for (i = psg_off; i < psg->length && |
1426 | sector < start + sectors; | |
fe052a18 | 1427 | i += sizeof(*sdt)) { |
18213afb AM |
1428 | __u16 crc; |
1429 | unsigned int avail; | |
41861fa8 | 1430 | |
18213afb AM |
1431 | if (dsg_off >= dsg->length) { |
1432 | dsg_off -= dsg->length; | |
1433 | kunmap_atomic(daddr - dsg->offset); | |
1434 | dsg = sg_next(dsg); | |
1435 | if (!dsg) { | |
1436 | kunmap_atomic(paddr - psg->offset); | |
1437 | return 0; | |
1438 | } | |
1439 | daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; | |
41861fa8 NB |
1440 | } |
1441 | ||
18213afb | 1442 | sdt = paddr + i; |
41861fa8 NB |
1443 | |
1444 | pr_debug("DIF READ sector: %llu guard_tag: 0x%04x" | |
1445 | " app_tag: 0x%04x ref_tag: %u\n", | |
1446 | (unsigned long long)sector, sdt->guard_tag, | |
1447 | sdt->app_tag, be32_to_cpu(sdt->ref_tag)); | |
1448 | ||
1449 | if (sdt->app_tag == cpu_to_be16(0xffff)) { | |
18213afb AM |
1450 | dsg_off += block_size; |
1451 | goto next; | |
1452 | } | |
1453 | ||
1454 | avail = min(block_size, dsg->length - dsg_off); | |
1455 | crc = crc_t10dif(daddr + dsg_off, avail); | |
1456 | if (avail < block_size) { | |
1457 | kunmap_atomic(daddr - dsg->offset); | |
1458 | dsg = sg_next(dsg); | |
1459 | if (!dsg) { | |
1460 | kunmap_atomic(paddr - psg->offset); | |
1461 | return 0; | |
1462 | } | |
1463 | daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; | |
1464 | dsg_off = block_size - avail; | |
1465 | crc = crc_t10dif_update(crc, daddr, dsg_off); | |
1466 | } else { | |
1467 | dsg_off += block_size; | |
41861fa8 NB |
1468 | } |
1469 | ||
18213afb | 1470 | rc = sbc_dif_v1_verify(cmd, sdt, crc, sector, ei_lba); |
41861fa8 | 1471 | if (rc) { |
414e4627 | 1472 | kunmap_atomic(daddr - dsg->offset); |
18213afb | 1473 | kunmap_atomic(paddr - psg->offset); |
76736db3 | 1474 | cmd->bad_sector = sector; |
41861fa8 NB |
1475 | return rc; |
1476 | } | |
18213afb | 1477 | next: |
41861fa8 NB |
1478 | sector++; |
1479 | ei_lba++; | |
41861fa8 NB |
1480 | } |
1481 | ||
18213afb | 1482 | psg_off = 0; |
414e4627 | 1483 | kunmap_atomic(daddr - dsg->offset); |
18213afb | 1484 | kunmap_atomic(paddr - psg->offset); |
41861fa8 | 1485 | } |
41861fa8 NB |
1486 | |
1487 | return 0; | |
1488 | } | |
f75b6fae | 1489 | EXPORT_SYMBOL(sbc_dif_verify); |