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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) { | |
a71a5dc7 | 510 | pr_debug("compare_and_write_callback: non zero scsi_status:" |
db60df88 | 511 | " 0x%02x\n", cmd->scsi_status); |
a71a5dc7 NB |
512 | *post_ret = 1; |
513 | if (cmd->scsi_status == SAM_STAT_CHECK_CONDITION) | |
514 | ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
db60df88 NB |
515 | goto out; |
516 | } | |
cf6d1f09 | 517 | |
68ff9b9b NB |
518 | buf = kzalloc(cmd->data_length, GFP_KERNEL); |
519 | if (!buf) { | |
520 | pr_err("Unable to allocate compare_and_write buf\n"); | |
a2890087 NB |
521 | ret = TCM_OUT_OF_RESOURCES; |
522 | goto out; | |
68ff9b9b NB |
523 | } |
524 | ||
f318aef5 ME |
525 | write_sg = kmalloc_array(cmd->t_data_nents, sizeof(*write_sg), |
526 | GFP_KERNEL); | |
68ff9b9b NB |
527 | if (!write_sg) { |
528 | pr_err("Unable to allocate compare_and_write sg\n"); | |
529 | ret = TCM_OUT_OF_RESOURCES; | |
530 | goto out; | |
531 | } | |
a1e1774c | 532 | sg_init_table(write_sg, cmd->t_data_nents); |
68ff9b9b NB |
533 | /* |
534 | * Setup verify and write data payloads from total NumberLBAs. | |
535 | */ | |
536 | rc = sg_copy_to_buffer(cmd->t_data_sg, cmd->t_data_nents, buf, | |
537 | cmd->data_length); | |
538 | if (!rc) { | |
539 | pr_err("sg_copy_to_buffer() failed for compare_and_write\n"); | |
540 | ret = TCM_OUT_OF_RESOURCES; | |
541 | goto out; | |
542 | } | |
543 | /* | |
544 | * Compare against SCSI READ payload against verify payload | |
545 | */ | |
546 | for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, i) { | |
547 | addr = (unsigned char *)kmap_atomic(sg_page(sg)); | |
548 | if (!addr) { | |
549 | ret = TCM_OUT_OF_RESOURCES; | |
550 | goto out; | |
551 | } | |
552 | ||
553 | len = min(sg->length, compare_len); | |
554 | ||
555 | if (memcmp(addr, buf + offset, len)) { | |
556 | pr_warn("Detected MISCOMPARE for addr: %p buf: %p\n", | |
557 | addr, buf + offset); | |
558 | kunmap_atomic(addr); | |
559 | goto miscompare; | |
560 | } | |
561 | kunmap_atomic(addr); | |
562 | ||
563 | offset += len; | |
564 | compare_len -= len; | |
565 | if (!compare_len) | |
566 | break; | |
567 | } | |
568 | ||
569 | i = 0; | |
570 | len = cmd->t_task_nolb * block_size; | |
571 | sg_miter_start(&m, cmd->t_data_sg, cmd->t_data_nents, SG_MITER_TO_SG); | |
572 | /* | |
573 | * Currently assumes NoLB=1 and SGLs are PAGE_SIZE.. | |
574 | */ | |
575 | while (len) { | |
576 | sg_miter_next(&m); | |
577 | ||
578 | if (block_size < PAGE_SIZE) { | |
579 | sg_set_page(&write_sg[i], m.page, block_size, | |
d94e5a61 | 580 | m.piter.sg->offset + block_size); |
68ff9b9b NB |
581 | } else { |
582 | sg_miter_next(&m); | |
583 | sg_set_page(&write_sg[i], m.page, block_size, | |
d94e5a61 | 584 | m.piter.sg->offset); |
68ff9b9b NB |
585 | } |
586 | len -= block_size; | |
587 | i++; | |
588 | } | |
589 | sg_miter_stop(&m); | |
590 | /* | |
591 | * Save the original SGL + nents values before updating to new | |
592 | * assignments, to be released in transport_free_pages() -> | |
593 | * transport_reset_sgl_orig() | |
594 | */ | |
595 | cmd->t_data_sg_orig = cmd->t_data_sg; | |
596 | cmd->t_data_sg = write_sg; | |
597 | cmd->t_data_nents_orig = cmd->t_data_nents; | |
598 | cmd->t_data_nents = 1; | |
599 | ||
68d81f40 | 600 | cmd->sam_task_attr = TCM_HEAD_TAG; |
68ff9b9b NB |
601 | cmd->transport_complete_callback = compare_and_write_post; |
602 | /* | |
603 | * Now reset ->execute_cmd() to the normal sbc_execute_rw() handler | |
604 | * for submitting the adjusted SGL to write instance user-data. | |
605 | */ | |
606 | cmd->execute_cmd = sbc_execute_rw; | |
607 | ||
608 | spin_lock_irq(&cmd->t_state_lock); | |
609 | cmd->t_state = TRANSPORT_PROCESSING; | |
fd5e64de | 610 | cmd->transport_state |= CMD_T_ACTIVE | CMD_T_SENT; |
68ff9b9b NB |
611 | spin_unlock_irq(&cmd->t_state_lock); |
612 | ||
dff0ca9e | 613 | __target_execute_cmd(cmd, false); |
68ff9b9b NB |
614 | |
615 | kfree(buf); | |
616 | return ret; | |
617 | ||
618 | miscompare: | |
619 | pr_warn("Target/%s: Send MISCOMPARE check condition and sense\n", | |
620 | dev->transport->name); | |
621 | ret = TCM_MISCOMPARE_VERIFY; | |
622 | out: | |
623 | /* | |
624 | * In the MISCOMPARE or failure case, unlock ->caw_sem obtained in | |
625 | * sbc_compare_and_write() before the original READ I/O submission. | |
626 | */ | |
627 | up(&dev->caw_sem); | |
628 | kfree(write_sg); | |
629 | kfree(buf); | |
630 | return ret; | |
631 | } | |
632 | ||
633 | static sense_reason_t | |
634 | sbc_compare_and_write(struct se_cmd *cmd) | |
635 | { | |
7a971b1b | 636 | struct sbc_ops *ops = cmd->protocol_data; |
68ff9b9b NB |
637 | struct se_device *dev = cmd->se_dev; |
638 | sense_reason_t ret; | |
639 | int rc; | |
640 | /* | |
641 | * Submit the READ first for COMPARE_AND_WRITE to perform the | |
642 | * comparision using SGLs at cmd->t_bidi_data_sg.. | |
643 | */ | |
644 | rc = down_interruptible(&dev->caw_sem); | |
ee7619f2 | 645 | if (rc != 0) { |
68ff9b9b NB |
646 | cmd->transport_complete_callback = NULL; |
647 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
648 | } | |
b7191253 NB |
649 | /* |
650 | * Reset cmd->data_length to individual block_size in order to not | |
651 | * confuse backend drivers that depend on this value matching the | |
652 | * size of the I/O being submitted. | |
653 | */ | |
654 | cmd->data_length = cmd->t_task_nolb * dev->dev_attrib.block_size; | |
68ff9b9b | 655 | |
7a971b1b | 656 | ret = ops->execute_rw(cmd, cmd->t_bidi_data_sg, cmd->t_bidi_data_nents, |
68ff9b9b NB |
657 | DMA_FROM_DEVICE); |
658 | if (ret) { | |
659 | cmd->transport_complete_callback = NULL; | |
660 | up(&dev->caw_sem); | |
661 | return ret; | |
662 | } | |
663 | /* | |
664 | * Unlock of dev->caw_sem to occur in compare_and_write_callback() | |
665 | * upon MISCOMPARE, or in compare_and_write_done() upon completion | |
666 | * of WRITE instance user-data. | |
667 | */ | |
668 | return TCM_NO_SENSE; | |
669 | } | |
670 | ||
19f9361a | 671 | static int |
38b57f82 | 672 | sbc_set_prot_op_checks(u8 protect, bool fabric_prot, enum target_prot_type prot_type, |
19f9361a SG |
673 | bool is_write, struct se_cmd *cmd) |
674 | { | |
675 | if (is_write) { | |
38b57f82 NB |
676 | cmd->prot_op = fabric_prot ? TARGET_PROT_DOUT_STRIP : |
677 | protect ? TARGET_PROT_DOUT_PASS : | |
678 | TARGET_PROT_DOUT_INSERT; | |
19f9361a SG |
679 | switch (protect) { |
680 | case 0x0: | |
681 | case 0x3: | |
682 | cmd->prot_checks = 0; | |
683 | break; | |
684 | case 0x1: | |
685 | case 0x5: | |
686 | cmd->prot_checks = TARGET_DIF_CHECK_GUARD; | |
687 | if (prot_type == TARGET_DIF_TYPE1_PROT) | |
688 | cmd->prot_checks |= TARGET_DIF_CHECK_REFTAG; | |
689 | break; | |
690 | case 0x2: | |
691 | if (prot_type == TARGET_DIF_TYPE1_PROT) | |
692 | cmd->prot_checks = TARGET_DIF_CHECK_REFTAG; | |
693 | break; | |
694 | case 0x4: | |
695 | cmd->prot_checks = TARGET_DIF_CHECK_GUARD; | |
696 | break; | |
697 | default: | |
698 | pr_err("Unsupported protect field %d\n", protect); | |
699 | return -EINVAL; | |
700 | } | |
701 | } else { | |
38b57f82 NB |
702 | cmd->prot_op = fabric_prot ? TARGET_PROT_DIN_INSERT : |
703 | protect ? TARGET_PROT_DIN_PASS : | |
704 | TARGET_PROT_DIN_STRIP; | |
19f9361a SG |
705 | switch (protect) { |
706 | case 0x0: | |
707 | case 0x1: | |
708 | case 0x5: | |
709 | cmd->prot_checks = TARGET_DIF_CHECK_GUARD; | |
710 | if (prot_type == TARGET_DIF_TYPE1_PROT) | |
711 | cmd->prot_checks |= TARGET_DIF_CHECK_REFTAG; | |
712 | break; | |
713 | case 0x2: | |
714 | if (prot_type == TARGET_DIF_TYPE1_PROT) | |
715 | cmd->prot_checks = TARGET_DIF_CHECK_REFTAG; | |
716 | break; | |
717 | case 0x3: | |
718 | cmd->prot_checks = 0; | |
719 | break; | |
720 | case 0x4: | |
721 | cmd->prot_checks = TARGET_DIF_CHECK_GUARD; | |
722 | break; | |
723 | default: | |
724 | pr_err("Unsupported protect field %d\n", protect); | |
725 | return -EINVAL; | |
726 | } | |
727 | } | |
728 | ||
729 | return 0; | |
730 | } | |
731 | ||
f7b7c06f | 732 | static sense_reason_t |
499bf77b | 733 | sbc_check_prot(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb, |
19f9361a | 734 | u32 sectors, bool is_write) |
499bf77b | 735 | { |
19f9361a | 736 | u8 protect = cdb[1] >> 5; |
38b57f82 NB |
737 | int sp_ops = cmd->se_sess->sup_prot_ops; |
738 | int pi_prot_type = dev->dev_attrib.pi_prot_type; | |
739 | bool fabric_prot = false; | |
19f9361a | 740 | |
f7b7c06f | 741 | if (!cmd->t_prot_sg || !cmd->t_prot_nents) { |
38b57f82 NB |
742 | if (unlikely(protect && |
743 | !dev->dev_attrib.pi_prot_type && !cmd->se_sess->sess_prot_type)) { | |
744 | pr_err("CDB contains protect bit, but device + fabric does" | |
745 | " not advertise PROTECT=1 feature bit\n"); | |
f7b7c06f NB |
746 | return TCM_INVALID_CDB_FIELD; |
747 | } | |
748 | if (cmd->prot_pto) | |
749 | return TCM_NO_SENSE; | |
750 | } | |
499bf77b NB |
751 | |
752 | switch (dev->dev_attrib.pi_prot_type) { | |
753 | case TARGET_DIF_TYPE3_PROT: | |
499bf77b NB |
754 | cmd->reftag_seed = 0xffffffff; |
755 | break; | |
756 | case TARGET_DIF_TYPE2_PROT: | |
19f9361a | 757 | if (protect) |
f7b7c06f | 758 | return TCM_INVALID_CDB_FIELD; |
499bf77b NB |
759 | |
760 | cmd->reftag_seed = cmd->t_task_lba; | |
761 | break; | |
762 | case TARGET_DIF_TYPE1_PROT: | |
499bf77b NB |
763 | cmd->reftag_seed = cmd->t_task_lba; |
764 | break; | |
765 | case TARGET_DIF_TYPE0_PROT: | |
38b57f82 NB |
766 | /* |
767 | * See if the fabric supports T10-PI, and the session has been | |
768 | * configured to allow export PROTECT=1 feature bit with backend | |
769 | * devices that don't support T10-PI. | |
770 | */ | |
771 | fabric_prot = is_write ? | |
772 | !!(sp_ops & (TARGET_PROT_DOUT_PASS | TARGET_PROT_DOUT_STRIP)) : | |
773 | !!(sp_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DIN_INSERT)); | |
774 | ||
775 | if (fabric_prot && cmd->se_sess->sess_prot_type) { | |
776 | pi_prot_type = cmd->se_sess->sess_prot_type; | |
777 | break; | |
778 | } | |
cceca4a6 NB |
779 | if (!protect) |
780 | return TCM_NO_SENSE; | |
38b57f82 | 781 | /* Fallthrough */ |
499bf77b | 782 | default: |
cceca4a6 NB |
783 | pr_err("Unable to determine pi_prot_type for CDB: 0x%02x " |
784 | "PROTECT: 0x%02x\n", cdb[0], protect); | |
785 | return TCM_INVALID_CDB_FIELD; | |
499bf77b NB |
786 | } |
787 | ||
38b57f82 | 788 | if (sbc_set_prot_op_checks(protect, fabric_prot, pi_prot_type, is_write, cmd)) |
f7b7c06f | 789 | return TCM_INVALID_CDB_FIELD; |
19f9361a | 790 | |
38b57f82 | 791 | cmd->prot_type = pi_prot_type; |
499bf77b | 792 | cmd->prot_length = dev->prot_length * sectors; |
e2a4f55c SG |
793 | |
794 | /** | |
795 | * In case protection information exists over the wire | |
796 | * we modify command data length to describe pure data. | |
797 | * The actual transfer length is data length + protection | |
798 | * length | |
799 | **/ | |
800 | if (protect) | |
801 | cmd->data_length = sectors * dev->dev_attrib.block_size; | |
802 | ||
803 | pr_debug("%s: prot_type=%d, data_length=%d, prot_length=%d " | |
804 | "prot_op=%d prot_checks=%d\n", | |
805 | __func__, cmd->prot_type, cmd->data_length, cmd->prot_length, | |
03abad9e | 806 | cmd->prot_op, cmd->prot_checks); |
499bf77b | 807 | |
f7b7c06f | 808 | return TCM_NO_SENSE; |
499bf77b NB |
809 | } |
810 | ||
fde9f50f NB |
811 | static int |
812 | sbc_check_dpofua(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb) | |
813 | { | |
814 | if (cdb[1] & 0x10) { | |
814e5b45 CH |
815 | /* see explanation in spc_emulate_modesense */ |
816 | if (!target_check_fua(dev)) { | |
fde9f50f NB |
817 | pr_err("Got CDB: 0x%02x with DPO bit set, but device" |
818 | " does not advertise support for DPO\n", cdb[0]); | |
819 | return -EINVAL; | |
820 | } | |
821 | } | |
822 | if (cdb[1] & 0x8) { | |
814e5b45 | 823 | if (!target_check_fua(dev)) { |
fde9f50f NB |
824 | pr_err("Got CDB: 0x%02x with FUA bit set, but device" |
825 | " does not advertise support for FUA write\n", | |
826 | cdb[0]); | |
827 | return -EINVAL; | |
828 | } | |
829 | cmd->se_cmd_flags |= SCF_FUA; | |
830 | } | |
831 | return 0; | |
499bf77b NB |
832 | } |
833 | ||
de103c93 CH |
834 | sense_reason_t |
835 | sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops) | |
d6e0175c | 836 | { |
d6e0175c CH |
837 | struct se_device *dev = cmd->se_dev; |
838 | unsigned char *cdb = cmd->t_task_cdb; | |
1fd032ee | 839 | unsigned int size; |
d6e0175c | 840 | u32 sectors = 0; |
de103c93 | 841 | sense_reason_t ret; |
d6e0175c | 842 | |
7a971b1b CH |
843 | cmd->protocol_data = ops; |
844 | ||
d6e0175c CH |
845 | switch (cdb[0]) { |
846 | case READ_6: | |
847 | sectors = transport_get_sectors_6(cdb); | |
848 | cmd->t_task_lba = transport_lba_21(cdb); | |
849 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
a82a9538 | 850 | cmd->execute_cmd = sbc_execute_rw; |
d6e0175c CH |
851 | break; |
852 | case READ_10: | |
853 | sectors = transport_get_sectors_10(cdb); | |
854 | cmd->t_task_lba = transport_lba_32(cdb); | |
499bf77b | 855 | |
fde9f50f NB |
856 | if (sbc_check_dpofua(dev, cmd, cdb)) |
857 | return TCM_INVALID_CDB_FIELD; | |
858 | ||
f7b7c06f NB |
859 | ret = sbc_check_prot(dev, cmd, cdb, sectors, false); |
860 | if (ret) | |
861 | return ret; | |
499bf77b | 862 | |
d6e0175c | 863 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
a82a9538 | 864 | cmd->execute_cmd = sbc_execute_rw; |
d6e0175c CH |
865 | break; |
866 | case READ_12: | |
867 | sectors = transport_get_sectors_12(cdb); | |
868 | cmd->t_task_lba = transport_lba_32(cdb); | |
499bf77b | 869 | |
fde9f50f NB |
870 | if (sbc_check_dpofua(dev, cmd, cdb)) |
871 | return TCM_INVALID_CDB_FIELD; | |
872 | ||
f7b7c06f NB |
873 | ret = sbc_check_prot(dev, cmd, cdb, sectors, false); |
874 | if (ret) | |
875 | return ret; | |
499bf77b | 876 | |
d6e0175c | 877 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
a82a9538 | 878 | cmd->execute_cmd = sbc_execute_rw; |
d6e0175c CH |
879 | break; |
880 | case READ_16: | |
881 | sectors = transport_get_sectors_16(cdb); | |
882 | cmd->t_task_lba = transport_lba_64(cdb); | |
499bf77b | 883 | |
fde9f50f NB |
884 | if (sbc_check_dpofua(dev, cmd, cdb)) |
885 | return TCM_INVALID_CDB_FIELD; | |
886 | ||
f7b7c06f NB |
887 | ret = sbc_check_prot(dev, cmd, cdb, sectors, false); |
888 | if (ret) | |
889 | return ret; | |
499bf77b | 890 | |
d6e0175c | 891 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
a82a9538 | 892 | cmd->execute_cmd = sbc_execute_rw; |
d6e0175c CH |
893 | break; |
894 | case WRITE_6: | |
895 | sectors = transport_get_sectors_6(cdb); | |
896 | cmd->t_task_lba = transport_lba_21(cdb); | |
897 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
a82a9538 | 898 | cmd->execute_cmd = sbc_execute_rw; |
d6e0175c CH |
899 | break; |
900 | case WRITE_10: | |
984a9d4c | 901 | case WRITE_VERIFY: |
d6e0175c CH |
902 | sectors = transport_get_sectors_10(cdb); |
903 | cmd->t_task_lba = transport_lba_32(cdb); | |
499bf77b | 904 | |
fde9f50f NB |
905 | if (sbc_check_dpofua(dev, cmd, cdb)) |
906 | return TCM_INVALID_CDB_FIELD; | |
907 | ||
f7b7c06f NB |
908 | ret = sbc_check_prot(dev, cmd, cdb, sectors, true); |
909 | if (ret) | |
910 | return ret; | |
499bf77b | 911 | |
d6e0175c | 912 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
a82a9538 | 913 | cmd->execute_cmd = sbc_execute_rw; |
d6e0175c CH |
914 | break; |
915 | case WRITE_12: | |
916 | sectors = transport_get_sectors_12(cdb); | |
917 | cmd->t_task_lba = transport_lba_32(cdb); | |
499bf77b | 918 | |
fde9f50f NB |
919 | if (sbc_check_dpofua(dev, cmd, cdb)) |
920 | return TCM_INVALID_CDB_FIELD; | |
921 | ||
f7b7c06f NB |
922 | ret = sbc_check_prot(dev, cmd, cdb, sectors, true); |
923 | if (ret) | |
924 | return ret; | |
499bf77b | 925 | |
d6e0175c | 926 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
a82a9538 | 927 | cmd->execute_cmd = sbc_execute_rw; |
d6e0175c CH |
928 | break; |
929 | case WRITE_16: | |
984a9d4c | 930 | case WRITE_VERIFY_16: |
d6e0175c CH |
931 | sectors = transport_get_sectors_16(cdb); |
932 | cmd->t_task_lba = transport_lba_64(cdb); | |
499bf77b | 933 | |
fde9f50f NB |
934 | if (sbc_check_dpofua(dev, cmd, cdb)) |
935 | return TCM_INVALID_CDB_FIELD; | |
936 | ||
f7b7c06f NB |
937 | ret = sbc_check_prot(dev, cmd, cdb, sectors, true); |
938 | if (ret) | |
939 | return ret; | |
499bf77b | 940 | |
d6e0175c | 941 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
a82a9538 | 942 | cmd->execute_cmd = sbc_execute_rw; |
d6e0175c CH |
943 | break; |
944 | case XDWRITEREAD_10: | |
de103c93 | 945 | if (cmd->data_direction != DMA_TO_DEVICE || |
d6e0175c | 946 | !(cmd->se_cmd_flags & SCF_BIDI)) |
de103c93 | 947 | return TCM_INVALID_CDB_FIELD; |
d6e0175c CH |
948 | sectors = transport_get_sectors_10(cdb); |
949 | ||
fde9f50f NB |
950 | if (sbc_check_dpofua(dev, cmd, cdb)) |
951 | return TCM_INVALID_CDB_FIELD; | |
952 | ||
d6e0175c CH |
953 | cmd->t_task_lba = transport_lba_32(cdb); |
954 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
955 | ||
956 | /* | |
957 | * Setup BIDI XOR callback to be run after I/O completion. | |
958 | */ | |
a82a9538 | 959 | cmd->execute_cmd = sbc_execute_rw; |
d6e0175c | 960 | cmd->transport_complete_callback = &xdreadwrite_callback; |
d6e0175c CH |
961 | break; |
962 | case VARIABLE_LENGTH_CMD: | |
963 | { | |
964 | u16 service_action = get_unaligned_be16(&cdb[8]); | |
965 | switch (service_action) { | |
966 | case XDWRITEREAD_32: | |
967 | sectors = transport_get_sectors_32(cdb); | |
968 | ||
fde9f50f NB |
969 | if (sbc_check_dpofua(dev, cmd, cdb)) |
970 | return TCM_INVALID_CDB_FIELD; | |
d6e0175c CH |
971 | /* |
972 | * Use WRITE_32 and READ_32 opcodes for the emulated | |
973 | * XDWRITE_READ_32 logic. | |
974 | */ | |
975 | cmd->t_task_lba = transport_lba_64_ext(cdb); | |
976 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
977 | ||
978 | /* | |
979 | * Setup BIDI XOR callback to be run during after I/O | |
980 | * completion. | |
981 | */ | |
a82a9538 | 982 | cmd->execute_cmd = sbc_execute_rw; |
d6e0175c | 983 | cmd->transport_complete_callback = &xdreadwrite_callback; |
d6e0175c CH |
984 | break; |
985 | case WRITE_SAME_32: | |
986 | sectors = transport_get_sectors_32(cdb); | |
987 | if (!sectors) { | |
988 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not" | |
989 | " supported\n"); | |
de103c93 | 990 | return TCM_INVALID_CDB_FIELD; |
d6e0175c CH |
991 | } |
992 | ||
1fd032ee | 993 | size = sbc_get_size(cmd, 1); |
d6e0175c CH |
994 | cmd->t_task_lba = get_unaligned_be64(&cdb[12]); |
995 | ||
cd063bef | 996 | ret = sbc_setup_write_same(cmd, &cdb[10], ops); |
6b64e1fe | 997 | if (ret) |
cd063bef | 998 | return ret; |
d6e0175c CH |
999 | break; |
1000 | default: | |
1001 | pr_err("VARIABLE_LENGTH_CMD service action" | |
1002 | " 0x%04x not supported\n", service_action); | |
de103c93 | 1003 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
d6e0175c CH |
1004 | } |
1005 | break; | |
1006 | } | |
68ff9b9b NB |
1007 | case COMPARE_AND_WRITE: |
1008 | sectors = cdb[13]; | |
1009 | /* | |
1010 | * Currently enforce COMPARE_AND_WRITE for a single sector | |
1011 | */ | |
1012 | if (sectors > 1) { | |
1013 | pr_err("COMPARE_AND_WRITE contains NoLB: %u greater" | |
1014 | " than 1\n", sectors); | |
1015 | return TCM_INVALID_CDB_FIELD; | |
1016 | } | |
ab81a5e0 DD |
1017 | if (sbc_check_dpofua(dev, cmd, cdb)) |
1018 | return TCM_INVALID_CDB_FIELD; | |
1019 | ||
68ff9b9b NB |
1020 | /* |
1021 | * Double size because we have two buffers, note that | |
1022 | * zero is not an error.. | |
1023 | */ | |
1024 | size = 2 * sbc_get_size(cmd, sectors); | |
1025 | cmd->t_task_lba = get_unaligned_be64(&cdb[2]); | |
1026 | cmd->t_task_nolb = sectors; | |
1027 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB | SCF_COMPARE_AND_WRITE; | |
68ff9b9b NB |
1028 | cmd->execute_cmd = sbc_compare_and_write; |
1029 | cmd->transport_complete_callback = compare_and_write_callback; | |
1030 | break; | |
d6e0175c | 1031 | case READ_CAPACITY: |
1fd032ee CH |
1032 | size = READ_CAP_LEN; |
1033 | cmd->execute_cmd = sbc_emulate_readcapacity; | |
d6e0175c | 1034 | break; |
eb846d9f | 1035 | case SERVICE_ACTION_IN_16: |
d6e0175c CH |
1036 | switch (cmd->t_task_cdb[1] & 0x1f) { |
1037 | case SAI_READ_CAPACITY_16: | |
1fd032ee | 1038 | cmd->execute_cmd = sbc_emulate_readcapacity_16; |
d6e0175c | 1039 | break; |
c66094bf HR |
1040 | case SAI_REPORT_REFERRALS: |
1041 | cmd->execute_cmd = target_emulate_report_referrals; | |
1042 | break; | |
d6e0175c CH |
1043 | default: |
1044 | pr_err("Unsupported SA: 0x%02x\n", | |
1045 | cmd->t_task_cdb[1] & 0x1f); | |
de103c93 | 1046 | return TCM_INVALID_CDB_FIELD; |
d6e0175c | 1047 | } |
1fd032ee | 1048 | size = (cdb[10] << 24) | (cdb[11] << 16) | |
d6e0175c CH |
1049 | (cdb[12] << 8) | cdb[13]; |
1050 | break; | |
1051 | case SYNCHRONIZE_CACHE: | |
1052 | case SYNCHRONIZE_CACHE_16: | |
d6e0175c CH |
1053 | if (cdb[0] == SYNCHRONIZE_CACHE) { |
1054 | sectors = transport_get_sectors_10(cdb); | |
1055 | cmd->t_task_lba = transport_lba_32(cdb); | |
1056 | } else { | |
1057 | sectors = transport_get_sectors_16(cdb); | |
1058 | cmd->t_task_lba = transport_lba_64(cdb); | |
1059 | } | |
6ef31dc7 CVB |
1060 | if (ops->execute_sync_cache) { |
1061 | cmd->execute_cmd = ops->execute_sync_cache; | |
1062 | goto check_lba; | |
d6e0175c | 1063 | } |
6ef31dc7 CVB |
1064 | size = 0; |
1065 | cmd->execute_cmd = sbc_emulate_noop; | |
d6e0175c CH |
1066 | break; |
1067 | case UNMAP: | |
14150a6b | 1068 | if (!ops->execute_unmap) |
de103c93 | 1069 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
14150a6b | 1070 | |
61fdb4ac NB |
1071 | if (!dev->dev_attrib.emulate_tpu) { |
1072 | pr_err("Got UNMAP, but backend device has" | |
1073 | " emulate_tpu disabled\n"); | |
1074 | return TCM_UNSUPPORTED_SCSI_OPCODE; | |
1075 | } | |
1fd032ee | 1076 | size = get_unaligned_be16(&cdb[7]); |
62e46942 | 1077 | cmd->execute_cmd = sbc_execute_unmap; |
d6e0175c CH |
1078 | break; |
1079 | case WRITE_SAME_16: | |
1080 | sectors = transport_get_sectors_16(cdb); | |
1081 | if (!sectors) { | |
1082 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); | |
de103c93 | 1083 | return TCM_INVALID_CDB_FIELD; |
d6e0175c CH |
1084 | } |
1085 | ||
1fd032ee | 1086 | size = sbc_get_size(cmd, 1); |
d6e0175c CH |
1087 | cmd->t_task_lba = get_unaligned_be64(&cdb[2]); |
1088 | ||
cd063bef | 1089 | ret = sbc_setup_write_same(cmd, &cdb[1], ops); |
6b64e1fe | 1090 | if (ret) |
cd063bef | 1091 | return ret; |
d6e0175c CH |
1092 | break; |
1093 | case WRITE_SAME: | |
1094 | sectors = transport_get_sectors_10(cdb); | |
1095 | if (!sectors) { | |
1096 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); | |
de103c93 | 1097 | return TCM_INVALID_CDB_FIELD; |
d6e0175c CH |
1098 | } |
1099 | ||
1fd032ee | 1100 | size = sbc_get_size(cmd, 1); |
d6e0175c CH |
1101 | cmd->t_task_lba = get_unaligned_be32(&cdb[2]); |
1102 | ||
1103 | /* | |
1104 | * Follow sbcr26 with WRITE_SAME (10) and check for the existence | |
1105 | * of byte 1 bit 3 UNMAP instead of original reserved field | |
1106 | */ | |
cd063bef | 1107 | ret = sbc_setup_write_same(cmd, &cdb[1], ops); |
6b64e1fe | 1108 | if (ret) |
cd063bef | 1109 | return ret; |
d6e0175c CH |
1110 | break; |
1111 | case VERIFY: | |
13603685 | 1112 | case VERIFY_16: |
984a9d4c NB |
1113 | size = 0; |
1114 | if (cdb[0] == VERIFY) { | |
1115 | sectors = transport_get_sectors_10(cdb); | |
1116 | cmd->t_task_lba = transport_lba_32(cdb); | |
1117 | } else { | |
1118 | sectors = transport_get_sectors_16(cdb); | |
1119 | cmd->t_task_lba = transport_lba_64(cdb); | |
1120 | } | |
1920ed61 | 1121 | cmd->execute_cmd = sbc_emulate_noop; |
c52716de | 1122 | goto check_lba; |
1a1ff38c BK |
1123 | case REZERO_UNIT: |
1124 | case SEEK_6: | |
1125 | case SEEK_10: | |
1126 | /* | |
1127 | * There are still clients out there which use these old SCSI-2 | |
1128 | * commands. This mainly happens when running VMs with legacy | |
1129 | * guest systems, connected via SCSI command pass-through to | |
1130 | * iSCSI targets. Make them happy and return status GOOD. | |
1131 | */ | |
1132 | size = 0; | |
1133 | cmd->execute_cmd = sbc_emulate_noop; | |
1134 | break; | |
45182ed5 BB |
1135 | case START_STOP: |
1136 | size = 0; | |
1137 | cmd->execute_cmd = sbc_emulate_startstop; | |
1138 | break; | |
d6e0175c | 1139 | default: |
1fd032ee | 1140 | ret = spc_parse_cdb(cmd, &size); |
d6e0175c CH |
1141 | if (ret) |
1142 | return ret; | |
1143 | } | |
1144 | ||
1145 | /* reject any command that we don't have a handler for */ | |
20959c4b | 1146 | if (!cmd->execute_cmd) |
de103c93 | 1147 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
d6e0175c CH |
1148 | |
1149 | if (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) { | |
1fd032ee | 1150 | unsigned long long end_lba; |
6ef31dc7 | 1151 | check_lba: |
1fd032ee | 1152 | end_lba = dev->transport->get_blocks(dev) + 1; |
aa179935 NB |
1153 | if (((cmd->t_task_lba + sectors) < cmd->t_task_lba) || |
1154 | ((cmd->t_task_lba + sectors) > end_lba)) { | |
1fd032ee CH |
1155 | pr_err("cmd exceeds last lba %llu " |
1156 | "(lba %llu, sectors %u)\n", | |
1157 | end_lba, cmd->t_task_lba, sectors); | |
09ceadc7 | 1158 | return TCM_ADDRESS_OUT_OF_RANGE; |
1fd032ee CH |
1159 | } |
1160 | ||
68ff9b9b NB |
1161 | if (!(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) |
1162 | size = sbc_get_size(cmd, sectors); | |
d6e0175c CH |
1163 | } |
1164 | ||
de103c93 | 1165 | return target_cmd_size_check(cmd, size); |
d6e0175c CH |
1166 | } |
1167 | EXPORT_SYMBOL(sbc_parse_cdb); | |
6f23ac8a | 1168 | |
6f23ac8a CH |
1169 | u32 sbc_get_device_type(struct se_device *dev) |
1170 | { | |
1171 | return TYPE_DISK; | |
1172 | } | |
1173 | EXPORT_SYMBOL(sbc_get_device_type); | |
86d71829 | 1174 | |
62e46942 CH |
1175 | static sense_reason_t |
1176 | sbc_execute_unmap(struct se_cmd *cmd) | |
86d71829 | 1177 | { |
62e46942 | 1178 | struct sbc_ops *ops = cmd->protocol_data; |
86d71829 AH |
1179 | struct se_device *dev = cmd->se_dev; |
1180 | unsigned char *buf, *ptr = NULL; | |
1181 | sector_t lba; | |
1182 | int size; | |
1183 | u32 range; | |
1184 | sense_reason_t ret = 0; | |
1185 | int dl, bd_dl; | |
1186 | ||
1187 | /* We never set ANC_SUP */ | |
1188 | if (cmd->t_task_cdb[1]) | |
1189 | return TCM_INVALID_CDB_FIELD; | |
1190 | ||
1191 | if (cmd->data_length == 0) { | |
1192 | target_complete_cmd(cmd, SAM_STAT_GOOD); | |
1193 | return 0; | |
1194 | } | |
1195 | ||
1196 | if (cmd->data_length < 8) { | |
1197 | pr_warn("UNMAP parameter list length %u too small\n", | |
1198 | cmd->data_length); | |
1199 | return TCM_PARAMETER_LIST_LENGTH_ERROR; | |
1200 | } | |
1201 | ||
1202 | buf = transport_kmap_data_sg(cmd); | |
1203 | if (!buf) | |
1204 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
1205 | ||
1206 | dl = get_unaligned_be16(&buf[0]); | |
1207 | bd_dl = get_unaligned_be16(&buf[2]); | |
1208 | ||
1209 | size = cmd->data_length - 8; | |
1210 | if (bd_dl > size) | |
1211 | pr_warn("UNMAP parameter list length %u too small, ignoring bd_dl %u\n", | |
1212 | cmd->data_length, bd_dl); | |
1213 | else | |
1214 | size = bd_dl; | |
1215 | ||
1216 | if (size / 16 > dev->dev_attrib.max_unmap_block_desc_count) { | |
1217 | ret = TCM_INVALID_PARAMETER_LIST; | |
1218 | goto err; | |
1219 | } | |
1220 | ||
1221 | /* First UNMAP block descriptor starts at 8 byte offset */ | |
1222 | ptr = &buf[8]; | |
1223 | pr_debug("UNMAP: Sub: %s Using dl: %u bd_dl: %u size: %u" | |
1224 | " ptr: %p\n", dev->transport->name, dl, bd_dl, size, ptr); | |
1225 | ||
1226 | while (size >= 16) { | |
1227 | lba = get_unaligned_be64(&ptr[0]); | |
1228 | range = get_unaligned_be32(&ptr[8]); | |
1229 | pr_debug("UNMAP: Using lba: %llu and range: %u\n", | |
1230 | (unsigned long long)lba, range); | |
1231 | ||
1232 | if (range > dev->dev_attrib.max_unmap_lba_count) { | |
1233 | ret = TCM_INVALID_PARAMETER_LIST; | |
1234 | goto err; | |
1235 | } | |
1236 | ||
1237 | if (lba + range > dev->transport->get_blocks(dev) + 1) { | |
1238 | ret = TCM_ADDRESS_OUT_OF_RANGE; | |
1239 | goto err; | |
1240 | } | |
1241 | ||
62e46942 | 1242 | ret = ops->execute_unmap(cmd, lba, range); |
86d71829 AH |
1243 | if (ret) |
1244 | goto err; | |
1245 | ||
1246 | ptr += 16; | |
1247 | size -= 16; | |
1248 | } | |
1249 | ||
1250 | err: | |
1251 | transport_kunmap_data_sg(cmd); | |
1252 | if (!ret) | |
1253 | target_complete_cmd(cmd, GOOD); | |
1254 | return ret; | |
1255 | } | |
41861fa8 | 1256 | |
66a3d5bc NB |
1257 | void |
1258 | sbc_dif_generate(struct se_cmd *cmd) | |
1259 | { | |
1260 | struct se_device *dev = cmd->se_dev; | |
fe052a18 | 1261 | struct t10_pi_tuple *sdt; |
18213afb | 1262 | struct scatterlist *dsg = cmd->t_data_sg, *psg; |
66a3d5bc NB |
1263 | sector_t sector = cmd->t_task_lba; |
1264 | void *daddr, *paddr; | |
1265 | int i, j, offset = 0; | |
18213afb | 1266 | unsigned int block_size = dev->dev_attrib.block_size; |
66a3d5bc | 1267 | |
18213afb | 1268 | for_each_sg(cmd->t_prot_sg, psg, cmd->t_prot_nents, i) { |
66a3d5bc | 1269 | paddr = kmap_atomic(sg_page(psg)) + psg->offset; |
18213afb | 1270 | daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; |
66a3d5bc | 1271 | |
18213afb | 1272 | for (j = 0; j < psg->length; |
fe052a18 | 1273 | j += sizeof(*sdt)) { |
18213afb AM |
1274 | __u16 crc; |
1275 | unsigned int avail; | |
66a3d5bc | 1276 | |
18213afb AM |
1277 | if (offset >= dsg->length) { |
1278 | offset -= dsg->length; | |
1279 | kunmap_atomic(daddr - dsg->offset); | |
1280 | dsg = sg_next(dsg); | |
1281 | if (!dsg) { | |
1282 | kunmap_atomic(paddr - psg->offset); | |
1283 | return; | |
1284 | } | |
1285 | daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; | |
66a3d5bc | 1286 | } |
66a3d5bc | 1287 | |
18213afb AM |
1288 | sdt = paddr + j; |
1289 | avail = min(block_size, dsg->length - offset); | |
1290 | crc = crc_t10dif(daddr + offset, avail); | |
1291 | if (avail < block_size) { | |
1292 | kunmap_atomic(daddr - dsg->offset); | |
1293 | dsg = sg_next(dsg); | |
1294 | if (!dsg) { | |
1295 | kunmap_atomic(paddr - psg->offset); | |
1296 | return; | |
1297 | } | |
1298 | daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; | |
1299 | offset = block_size - avail; | |
1300 | crc = crc_t10dif_update(crc, daddr, offset); | |
1301 | } else { | |
1302 | offset += block_size; | |
66a3d5bc NB |
1303 | } |
1304 | ||
18213afb | 1305 | sdt->guard_tag = cpu_to_be16(crc); |
823ddd87 | 1306 | if (cmd->prot_type == TARGET_DIF_TYPE1_PROT) |
66a3d5bc NB |
1307 | sdt->ref_tag = cpu_to_be32(sector & 0xffffffff); |
1308 | sdt->app_tag = 0; | |
1309 | ||
6ae50408 | 1310 | pr_debug("DIF %s INSERT sector: %llu guard_tag: 0x%04x" |
66a3d5bc | 1311 | " app_tag: 0x%04x ref_tag: %u\n", |
6ae50408 NB |
1312 | (cmd->data_direction == DMA_TO_DEVICE) ? |
1313 | "WRITE" : "READ", (unsigned long long)sector, | |
1314 | sdt->guard_tag, sdt->app_tag, | |
1315 | be32_to_cpu(sdt->ref_tag)); | |
66a3d5bc NB |
1316 | |
1317 | sector++; | |
66a3d5bc NB |
1318 | } |
1319 | ||
18213afb AM |
1320 | kunmap_atomic(daddr - dsg->offset); |
1321 | kunmap_atomic(paddr - psg->offset); | |
66a3d5bc NB |
1322 | } |
1323 | } | |
1324 | ||
41861fa8 | 1325 | static sense_reason_t |
fe052a18 | 1326 | sbc_dif_v1_verify(struct se_cmd *cmd, struct t10_pi_tuple *sdt, |
18213afb | 1327 | __u16 crc, sector_t sector, unsigned int ei_lba) |
41861fa8 | 1328 | { |
41861fa8 NB |
1329 | __be16 csum; |
1330 | ||
d7a463b0 NB |
1331 | if (!(cmd->prot_checks & TARGET_DIF_CHECK_GUARD)) |
1332 | goto check_ref; | |
1333 | ||
18213afb | 1334 | csum = cpu_to_be16(crc); |
41861fa8 NB |
1335 | |
1336 | if (sdt->guard_tag != csum) { | |
1337 | pr_err("DIFv1 checksum failed on sector %llu guard tag 0x%04x" | |
1338 | " csum 0x%04x\n", (unsigned long long)sector, | |
1339 | be16_to_cpu(sdt->guard_tag), be16_to_cpu(csum)); | |
1340 | return TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED; | |
1341 | } | |
1342 | ||
d7a463b0 NB |
1343 | check_ref: |
1344 | if (!(cmd->prot_checks & TARGET_DIF_CHECK_REFTAG)) | |
1345 | return 0; | |
1346 | ||
823ddd87 | 1347 | if (cmd->prot_type == TARGET_DIF_TYPE1_PROT && |
41861fa8 NB |
1348 | be32_to_cpu(sdt->ref_tag) != (sector & 0xffffffff)) { |
1349 | pr_err("DIFv1 Type 1 reference failed on sector: %llu tag: 0x%08x" | |
1350 | " sector MSB: 0x%08x\n", (unsigned long long)sector, | |
1351 | be32_to_cpu(sdt->ref_tag), (u32)(sector & 0xffffffff)); | |
1352 | return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED; | |
1353 | } | |
1354 | ||
823ddd87 | 1355 | if (cmd->prot_type == TARGET_DIF_TYPE2_PROT && |
41861fa8 NB |
1356 | be32_to_cpu(sdt->ref_tag) != ei_lba) { |
1357 | pr_err("DIFv1 Type 2 reference failed on sector: %llu tag: 0x%08x" | |
1358 | " ei_lba: 0x%08x\n", (unsigned long long)sector, | |
1359 | be32_to_cpu(sdt->ref_tag), ei_lba); | |
1360 | return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED; | |
1361 | } | |
1362 | ||
1363 | return 0; | |
1364 | } | |
1365 | ||
f75b6fae SG |
1366 | void sbc_dif_copy_prot(struct se_cmd *cmd, unsigned int sectors, bool read, |
1367 | struct scatterlist *sg, int sg_off) | |
41861fa8 NB |
1368 | { |
1369 | struct se_device *dev = cmd->se_dev; | |
1370 | struct scatterlist *psg; | |
1371 | void *paddr, *addr; | |
1372 | unsigned int i, len, left; | |
10762e80 | 1373 | unsigned int offset = sg_off; |
41861fa8 | 1374 | |
38b57f82 NB |
1375 | if (!sg) |
1376 | return; | |
1377 | ||
41861fa8 NB |
1378 | left = sectors * dev->prot_length; |
1379 | ||
1380 | for_each_sg(cmd->t_prot_sg, psg, cmd->t_prot_nents, i) { | |
16c0ae02 | 1381 | unsigned int psg_len, copied = 0; |
d6a65fdc | 1382 | |
41861fa8 | 1383 | paddr = kmap_atomic(sg_page(psg)) + psg->offset; |
16c0ae02 SG |
1384 | psg_len = min(left, psg->length); |
1385 | while (psg_len) { | |
1386 | len = min(psg_len, sg->length - offset); | |
1387 | addr = kmap_atomic(sg_page(sg)) + sg->offset + offset; | |
1388 | ||
1389 | if (read) | |
1390 | memcpy(paddr + copied, addr, len); | |
1391 | else | |
1392 | memcpy(addr, paddr + copied, len); | |
1393 | ||
1394 | left -= len; | |
1395 | offset += len; | |
1396 | copied += len; | |
1397 | psg_len -= len; | |
1398 | ||
57636388 AM |
1399 | kunmap_atomic(addr - sg->offset - offset); |
1400 | ||
16c0ae02 SG |
1401 | if (offset >= sg->length) { |
1402 | sg = sg_next(sg); | |
1403 | offset = 0; | |
1404 | } | |
16c0ae02 | 1405 | } |
57636388 | 1406 | kunmap_atomic(paddr - psg->offset); |
41861fa8 NB |
1407 | } |
1408 | } | |
f75b6fae | 1409 | EXPORT_SYMBOL(sbc_dif_copy_prot); |
41861fa8 NB |
1410 | |
1411 | sense_reason_t | |
f75b6fae | 1412 | sbc_dif_verify(struct se_cmd *cmd, sector_t start, unsigned int sectors, |
414e4627 | 1413 | unsigned int ei_lba, struct scatterlist *psg, int psg_off) |
41861fa8 NB |
1414 | { |
1415 | struct se_device *dev = cmd->se_dev; | |
fe052a18 | 1416 | struct t10_pi_tuple *sdt; |
18213afb | 1417 | struct scatterlist *dsg = cmd->t_data_sg; |
41861fa8 NB |
1418 | sector_t sector = start; |
1419 | void *daddr, *paddr; | |
18213afb | 1420 | int i; |
41861fa8 | 1421 | sense_reason_t rc; |
18213afb AM |
1422 | int dsg_off = 0; |
1423 | unsigned int block_size = dev->dev_attrib.block_size; | |
41861fa8 | 1424 | |
18213afb | 1425 | for (; psg && sector < start + sectors; psg = sg_next(psg)) { |
41861fa8 | 1426 | paddr = kmap_atomic(sg_page(psg)) + psg->offset; |
41861fa8 | 1427 | daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; |
41861fa8 | 1428 | |
18213afb AM |
1429 | for (i = psg_off; i < psg->length && |
1430 | sector < start + sectors; | |
fe052a18 | 1431 | i += sizeof(*sdt)) { |
18213afb AM |
1432 | __u16 crc; |
1433 | unsigned int avail; | |
41861fa8 | 1434 | |
18213afb AM |
1435 | if (dsg_off >= dsg->length) { |
1436 | dsg_off -= dsg->length; | |
1437 | kunmap_atomic(daddr - dsg->offset); | |
1438 | dsg = sg_next(dsg); | |
1439 | if (!dsg) { | |
1440 | kunmap_atomic(paddr - psg->offset); | |
1441 | return 0; | |
1442 | } | |
1443 | daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; | |
41861fa8 NB |
1444 | } |
1445 | ||
18213afb | 1446 | sdt = paddr + i; |
41861fa8 NB |
1447 | |
1448 | pr_debug("DIF READ sector: %llu guard_tag: 0x%04x" | |
1449 | " app_tag: 0x%04x ref_tag: %u\n", | |
1450 | (unsigned long long)sector, sdt->guard_tag, | |
1451 | sdt->app_tag, be32_to_cpu(sdt->ref_tag)); | |
1452 | ||
128b6f9f | 1453 | if (sdt->app_tag == T10_PI_APP_ESCAPE) { |
18213afb AM |
1454 | dsg_off += block_size; |
1455 | goto next; | |
1456 | } | |
1457 | ||
1458 | avail = min(block_size, dsg->length - dsg_off); | |
1459 | crc = crc_t10dif(daddr + dsg_off, avail); | |
1460 | if (avail < block_size) { | |
1461 | kunmap_atomic(daddr - dsg->offset); | |
1462 | dsg = sg_next(dsg); | |
1463 | if (!dsg) { | |
1464 | kunmap_atomic(paddr - psg->offset); | |
1465 | return 0; | |
1466 | } | |
1467 | daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; | |
1468 | dsg_off = block_size - avail; | |
1469 | crc = crc_t10dif_update(crc, daddr, dsg_off); | |
1470 | } else { | |
1471 | dsg_off += block_size; | |
41861fa8 NB |
1472 | } |
1473 | ||
18213afb | 1474 | rc = sbc_dif_v1_verify(cmd, sdt, crc, sector, ei_lba); |
41861fa8 | 1475 | if (rc) { |
414e4627 | 1476 | kunmap_atomic(daddr - dsg->offset); |
18213afb | 1477 | kunmap_atomic(paddr - psg->offset); |
76736db3 | 1478 | cmd->bad_sector = sector; |
41861fa8 NB |
1479 | return rc; |
1480 | } | |
18213afb | 1481 | next: |
41861fa8 NB |
1482 | sector++; |
1483 | ei_lba++; | |
41861fa8 NB |
1484 | } |
1485 | ||
18213afb | 1486 | psg_off = 0; |
414e4627 | 1487 | kunmap_atomic(daddr - dsg->offset); |
18213afb | 1488 | kunmap_atomic(paddr - psg->offset); |
41861fa8 | 1489 | } |
41861fa8 NB |
1490 | |
1491 | return 0; | |
1492 | } | |
f75b6fae | 1493 | EXPORT_SYMBOL(sbc_dif_verify); |