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