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 CH |
27 | #include <asm/unaligned.h> |
28 | #include <scsi/scsi.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 | |
de103c93 CH |
39 | static sense_reason_t |
40 | sbc_emulate_readcapacity(struct se_cmd *cmd) | |
1fd032ee CH |
41 | { |
42 | struct se_device *dev = cmd->se_dev; | |
8dc8632a | 43 | unsigned char *cdb = cmd->t_task_cdb; |
1fd032ee | 44 | unsigned long long blocks_long = dev->transport->get_blocks(dev); |
a50da144 PB |
45 | unsigned char *rbuf; |
46 | unsigned char buf[8]; | |
1fd032ee CH |
47 | u32 blocks; |
48 | ||
8dc8632a RD |
49 | /* |
50 | * SBC-2 says: | |
51 | * If the PMI bit is set to zero and the LOGICAL BLOCK | |
52 | * ADDRESS field is not set to zero, the device server shall | |
53 | * terminate the command with CHECK CONDITION status with | |
54 | * the sense key set to ILLEGAL REQUEST and the additional | |
55 | * sense code set to INVALID FIELD IN CDB. | |
56 | * | |
57 | * In SBC-3, these fields are obsolete, but some SCSI | |
58 | * compliance tests actually check this, so we might as well | |
59 | * follow SBC-2. | |
60 | */ | |
61 | if (!(cdb[8] & 1) && !!(cdb[2] | cdb[3] | cdb[4] | cdb[5])) | |
62 | return TCM_INVALID_CDB_FIELD; | |
63 | ||
1fd032ee CH |
64 | if (blocks_long >= 0x00000000ffffffff) |
65 | blocks = 0xffffffff; | |
66 | else | |
67 | blocks = (u32)blocks_long; | |
68 | ||
1fd032ee CH |
69 | buf[0] = (blocks >> 24) & 0xff; |
70 | buf[1] = (blocks >> 16) & 0xff; | |
71 | buf[2] = (blocks >> 8) & 0xff; | |
72 | buf[3] = blocks & 0xff; | |
0fd97ccf CH |
73 | buf[4] = (dev->dev_attrib.block_size >> 24) & 0xff; |
74 | buf[5] = (dev->dev_attrib.block_size >> 16) & 0xff; | |
75 | buf[6] = (dev->dev_attrib.block_size >> 8) & 0xff; | |
76 | buf[7] = dev->dev_attrib.block_size & 0xff; | |
1fd032ee | 77 | |
a50da144 | 78 | rbuf = transport_kmap_data_sg(cmd); |
8b4b0dcb NB |
79 | if (rbuf) { |
80 | memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length)); | |
81 | transport_kunmap_data_sg(cmd); | |
82 | } | |
1fd032ee CH |
83 | |
84 | target_complete_cmd(cmd, GOOD); | |
85 | return 0; | |
86 | } | |
87 | ||
de103c93 CH |
88 | static sense_reason_t |
89 | sbc_emulate_readcapacity_16(struct se_cmd *cmd) | |
1fd032ee CH |
90 | { |
91 | struct se_device *dev = cmd->se_dev; | |
a50da144 PB |
92 | unsigned char *rbuf; |
93 | unsigned char buf[32]; | |
1fd032ee CH |
94 | unsigned long long blocks = dev->transport->get_blocks(dev); |
95 | ||
a50da144 | 96 | memset(buf, 0, sizeof(buf)); |
1fd032ee CH |
97 | buf[0] = (blocks >> 56) & 0xff; |
98 | buf[1] = (blocks >> 48) & 0xff; | |
99 | buf[2] = (blocks >> 40) & 0xff; | |
100 | buf[3] = (blocks >> 32) & 0xff; | |
101 | buf[4] = (blocks >> 24) & 0xff; | |
102 | buf[5] = (blocks >> 16) & 0xff; | |
103 | buf[6] = (blocks >> 8) & 0xff; | |
104 | buf[7] = blocks & 0xff; | |
0fd97ccf CH |
105 | buf[8] = (dev->dev_attrib.block_size >> 24) & 0xff; |
106 | buf[9] = (dev->dev_attrib.block_size >> 16) & 0xff; | |
107 | buf[10] = (dev->dev_attrib.block_size >> 8) & 0xff; | |
108 | buf[11] = dev->dev_attrib.block_size & 0xff; | |
56dac14c NB |
109 | /* |
110 | * Set P_TYPE and PROT_EN bits for DIF support | |
111 | */ | |
112 | if (dev->dev_attrib.pi_prot_type) | |
113 | buf[12] = (dev->dev_attrib.pi_prot_type - 1) << 1 | 0x1; | |
7f7caf6a AG |
114 | |
115 | if (dev->transport->get_lbppbe) | |
116 | buf[13] = dev->transport->get_lbppbe(dev) & 0x0f; | |
117 | ||
118 | if (dev->transport->get_alignment_offset_lbas) { | |
119 | u16 lalba = dev->transport->get_alignment_offset_lbas(dev); | |
120 | buf[14] = (lalba >> 8) & 0x3f; | |
121 | buf[15] = lalba & 0xff; | |
122 | } | |
123 | ||
1fd032ee CH |
124 | /* |
125 | * Set Thin Provisioning Enable bit following sbc3r22 in section | |
126 | * READ CAPACITY (16) byte 14 if emulate_tpu or emulate_tpws is enabled. | |
127 | */ | |
0fd97ccf | 128 | if (dev->dev_attrib.emulate_tpu || dev->dev_attrib.emulate_tpws) |
7f7caf6a | 129 | buf[14] |= 0x80; |
1fd032ee | 130 | |
a50da144 | 131 | rbuf = transport_kmap_data_sg(cmd); |
8b4b0dcb NB |
132 | if (rbuf) { |
133 | memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length)); | |
134 | transport_kunmap_data_sg(cmd); | |
135 | } | |
1fd032ee CH |
136 | |
137 | target_complete_cmd(cmd, GOOD); | |
138 | return 0; | |
139 | } | |
140 | ||
972b29c8 | 141 | sector_t sbc_get_write_same_sectors(struct se_cmd *cmd) |
1fd032ee | 142 | { |
1fd032ee | 143 | u32 num_blocks; |
1fd032ee CH |
144 | |
145 | if (cmd->t_task_cdb[0] == WRITE_SAME) | |
146 | num_blocks = get_unaligned_be16(&cmd->t_task_cdb[7]); | |
147 | else if (cmd->t_task_cdb[0] == WRITE_SAME_16) | |
148 | num_blocks = get_unaligned_be32(&cmd->t_task_cdb[10]); | |
149 | else /* WRITE_SAME_32 via VARIABLE_LENGTH_CMD */ | |
150 | num_blocks = get_unaligned_be32(&cmd->t_task_cdb[28]); | |
151 | ||
152 | /* | |
153 | * Use the explicit range when non zero is supplied, otherwise calculate | |
154 | * the remaining range based on ->get_blocks() - starting LBA. | |
155 | */ | |
6f974e8c CH |
156 | if (num_blocks) |
157 | return num_blocks; | |
1fd032ee | 158 | |
6f974e8c CH |
159 | return cmd->se_dev->transport->get_blocks(cmd->se_dev) - |
160 | cmd->t_task_lba + 1; | |
1fd032ee | 161 | } |
972b29c8 | 162 | EXPORT_SYMBOL(sbc_get_write_same_sectors); |
1fd032ee | 163 | |
de103c93 | 164 | static sense_reason_t |
1920ed61 | 165 | sbc_emulate_noop(struct se_cmd *cmd) |
1a1ff38c BK |
166 | { |
167 | target_complete_cmd(cmd, GOOD); | |
168 | return 0; | |
169 | } | |
170 | ||
d6e0175c CH |
171 | static inline u32 sbc_get_size(struct se_cmd *cmd, u32 sectors) |
172 | { | |
0fd97ccf | 173 | return cmd->se_dev->dev_attrib.block_size * sectors; |
d6e0175c CH |
174 | } |
175 | ||
176 | static int sbc_check_valid_sectors(struct se_cmd *cmd) | |
177 | { | |
178 | struct se_device *dev = cmd->se_dev; | |
179 | unsigned long long end_lba; | |
180 | u32 sectors; | |
181 | ||
0fd97ccf | 182 | sectors = cmd->data_length / dev->dev_attrib.block_size; |
d6e0175c CH |
183 | end_lba = dev->transport->get_blocks(dev) + 1; |
184 | ||
185 | if (cmd->t_task_lba + sectors > end_lba) { | |
186 | pr_err("target: lba %llu, sectors %u exceeds end lba %llu\n", | |
187 | cmd->t_task_lba, sectors, end_lba); | |
188 | return -EINVAL; | |
189 | } | |
190 | ||
191 | return 0; | |
192 | } | |
193 | ||
194 | static inline u32 transport_get_sectors_6(unsigned char *cdb) | |
195 | { | |
196 | /* | |
197 | * Use 8-bit sector value. SBC-3 says: | |
198 | * | |
199 | * A TRANSFER LENGTH field set to zero specifies that 256 | |
200 | * logical blocks shall be written. Any other value | |
201 | * specifies the number of logical blocks that shall be | |
202 | * written. | |
203 | */ | |
204 | return cdb[4] ? : 256; | |
205 | } | |
206 | ||
207 | static inline u32 transport_get_sectors_10(unsigned char *cdb) | |
208 | { | |
209 | return (u32)(cdb[7] << 8) + cdb[8]; | |
210 | } | |
211 | ||
212 | static inline u32 transport_get_sectors_12(unsigned char *cdb) | |
213 | { | |
214 | return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9]; | |
215 | } | |
216 | ||
217 | static inline u32 transport_get_sectors_16(unsigned char *cdb) | |
218 | { | |
219 | return (u32)(cdb[10] << 24) + (cdb[11] << 16) + | |
220 | (cdb[12] << 8) + cdb[13]; | |
221 | } | |
222 | ||
223 | /* | |
224 | * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants | |
225 | */ | |
226 | static inline u32 transport_get_sectors_32(unsigned char *cdb) | |
227 | { | |
228 | return (u32)(cdb[28] << 24) + (cdb[29] << 16) + | |
229 | (cdb[30] << 8) + cdb[31]; | |
230 | ||
231 | } | |
232 | ||
233 | static inline u32 transport_lba_21(unsigned char *cdb) | |
234 | { | |
235 | return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3]; | |
236 | } | |
237 | ||
238 | static inline u32 transport_lba_32(unsigned char *cdb) | |
239 | { | |
240 | return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5]; | |
241 | } | |
242 | ||
243 | static inline unsigned long long transport_lba_64(unsigned char *cdb) | |
244 | { | |
245 | unsigned int __v1, __v2; | |
246 | ||
247 | __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5]; | |
248 | __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9]; | |
249 | ||
250 | return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; | |
251 | } | |
252 | ||
253 | /* | |
254 | * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs | |
255 | */ | |
256 | static inline unsigned long long transport_lba_64_ext(unsigned char *cdb) | |
257 | { | |
258 | unsigned int __v1, __v2; | |
259 | ||
260 | __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15]; | |
261 | __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19]; | |
262 | ||
263 | return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; | |
264 | } | |
265 | ||
cd063bef NB |
266 | static sense_reason_t |
267 | sbc_setup_write_same(struct se_cmd *cmd, unsigned char *flags, struct sbc_ops *ops) | |
d6e0175c | 268 | { |
972b29c8 | 269 | unsigned int sectors = sbc_get_write_same_sectors(cmd); |
773cbaf7 | 270 | |
d6e0175c CH |
271 | if ((flags[0] & 0x04) || (flags[0] & 0x02)) { |
272 | pr_err("WRITE_SAME PBDATA and LBDATA" | |
273 | " bits not supported for Block Discard" | |
274 | " Emulation\n"); | |
cd063bef | 275 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
d6e0175c | 276 | } |
773cbaf7 NB |
277 | if (sectors > cmd->se_dev->dev_attrib.max_write_same_len) { |
278 | pr_warn("WRITE_SAME sectors: %u exceeds max_write_same_len: %u\n", | |
279 | sectors, cmd->se_dev->dev_attrib.max_write_same_len); | |
280 | return TCM_INVALID_CDB_FIELD; | |
281 | } | |
5cb770bf RD |
282 | /* We always have ANC_SUP == 0 so setting ANCHOR is always an error */ |
283 | if (flags[0] & 0x10) { | |
284 | pr_warn("WRITE SAME with ANCHOR not supported\n"); | |
285 | return TCM_INVALID_CDB_FIELD; | |
286 | } | |
d6e0175c | 287 | /* |
cd063bef NB |
288 | * Special case for WRITE_SAME w/ UNMAP=1 that ends up getting |
289 | * translated into block discard requests within backend code. | |
d6e0175c | 290 | */ |
cd063bef NB |
291 | if (flags[0] & 0x08) { |
292 | if (!ops->execute_write_same_unmap) | |
293 | return TCM_UNSUPPORTED_SCSI_OPCODE; | |
294 | ||
295 | cmd->execute_cmd = ops->execute_write_same_unmap; | |
296 | return 0; | |
d6e0175c | 297 | } |
cd063bef NB |
298 | if (!ops->execute_write_same) |
299 | return TCM_UNSUPPORTED_SCSI_OPCODE; | |
d6e0175c | 300 | |
cd063bef | 301 | cmd->execute_cmd = ops->execute_write_same; |
d6e0175c CH |
302 | return 0; |
303 | } | |
304 | ||
a6b0133c | 305 | static sense_reason_t xdreadwrite_callback(struct se_cmd *cmd) |
d6e0175c CH |
306 | { |
307 | unsigned char *buf, *addr; | |
308 | struct scatterlist *sg; | |
309 | unsigned int offset; | |
a6b0133c NB |
310 | sense_reason_t ret = TCM_NO_SENSE; |
311 | int i, count; | |
d6e0175c CH |
312 | /* |
313 | * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command | |
314 | * | |
315 | * 1) read the specified logical block(s); | |
316 | * 2) transfer logical blocks from the data-out buffer; | |
317 | * 3) XOR the logical blocks transferred from the data-out buffer with | |
318 | * the logical blocks read, storing the resulting XOR data in a buffer; | |
319 | * 4) if the DISABLE WRITE bit is set to zero, then write the logical | |
320 | * blocks transferred from the data-out buffer; and | |
321 | * 5) transfer the resulting XOR data to the data-in buffer. | |
322 | */ | |
323 | buf = kmalloc(cmd->data_length, GFP_KERNEL); | |
324 | if (!buf) { | |
325 | pr_err("Unable to allocate xor_callback buf\n"); | |
a6b0133c | 326 | return TCM_OUT_OF_RESOURCES; |
d6e0175c CH |
327 | } |
328 | /* | |
329 | * Copy the scatterlist WRITE buffer located at cmd->t_data_sg | |
330 | * into the locally allocated *buf | |
331 | */ | |
332 | sg_copy_to_buffer(cmd->t_data_sg, | |
333 | cmd->t_data_nents, | |
334 | buf, | |
335 | cmd->data_length); | |
336 | ||
337 | /* | |
338 | * Now perform the XOR against the BIDI read memory located at | |
339 | * cmd->t_mem_bidi_list | |
340 | */ | |
341 | ||
342 | offset = 0; | |
343 | for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) { | |
344 | addr = kmap_atomic(sg_page(sg)); | |
a6b0133c NB |
345 | if (!addr) { |
346 | ret = TCM_OUT_OF_RESOURCES; | |
d6e0175c | 347 | goto out; |
a6b0133c | 348 | } |
d6e0175c CH |
349 | |
350 | for (i = 0; i < sg->length; i++) | |
351 | *(addr + sg->offset + i) ^= *(buf + offset + i); | |
352 | ||
353 | offset += sg->length; | |
354 | kunmap_atomic(addr); | |
355 | } | |
356 | ||
357 | out: | |
358 | kfree(buf); | |
a6b0133c | 359 | return ret; |
d6e0175c CH |
360 | } |
361 | ||
a82a9538 NB |
362 | static sense_reason_t |
363 | sbc_execute_rw(struct se_cmd *cmd) | |
364 | { | |
365 | return cmd->execute_rw(cmd, cmd->t_data_sg, cmd->t_data_nents, | |
366 | cmd->data_direction); | |
367 | } | |
368 | ||
68ff9b9b NB |
369 | static sense_reason_t compare_and_write_post(struct se_cmd *cmd) |
370 | { | |
371 | struct se_device *dev = cmd->se_dev; | |
372 | ||
d8855c15 NB |
373 | /* |
374 | * Only set SCF_COMPARE_AND_WRITE_POST to force a response fall-through | |
375 | * within target_complete_ok_work() if the command was successfully | |
376 | * sent to the backend driver. | |
377 | */ | |
378 | spin_lock_irq(&cmd->t_state_lock); | |
379 | if ((cmd->transport_state & CMD_T_SENT) && !cmd->scsi_status) | |
380 | cmd->se_cmd_flags |= SCF_COMPARE_AND_WRITE_POST; | |
381 | spin_unlock_irq(&cmd->t_state_lock); | |
382 | ||
68ff9b9b NB |
383 | /* |
384 | * Unlock ->caw_sem originally obtained during sbc_compare_and_write() | |
385 | * before the original READ I/O submission. | |
386 | */ | |
387 | up(&dev->caw_sem); | |
388 | ||
389 | return TCM_NO_SENSE; | |
390 | } | |
391 | ||
392 | static sense_reason_t compare_and_write_callback(struct se_cmd *cmd) | |
393 | { | |
394 | struct se_device *dev = cmd->se_dev; | |
395 | struct scatterlist *write_sg = NULL, *sg; | |
db60df88 | 396 | unsigned char *buf = NULL, *addr; |
68ff9b9b NB |
397 | struct sg_mapping_iter m; |
398 | unsigned int offset = 0, len; | |
399 | unsigned int nlbas = cmd->t_task_nolb; | |
400 | unsigned int block_size = dev->dev_attrib.block_size; | |
401 | unsigned int compare_len = (nlbas * block_size); | |
402 | sense_reason_t ret = TCM_NO_SENSE; | |
403 | int rc, i; | |
404 | ||
cf6d1f09 NB |
405 | /* |
406 | * Handle early failure in transport_generic_request_failure(), | |
407 | * which will not have taken ->caw_mutex yet.. | |
408 | */ | |
409 | if (!cmd->t_data_sg || !cmd->t_bidi_data_sg) | |
410 | return TCM_NO_SENSE; | |
db60df88 NB |
411 | /* |
412 | * Immediately exit + release dev->caw_sem if command has already | |
413 | * been failed with a non-zero SCSI status. | |
414 | */ | |
415 | if (cmd->scsi_status) { | |
416 | pr_err("compare_and_write_callback: non zero scsi_status:" | |
417 | " 0x%02x\n", cmd->scsi_status); | |
418 | goto out; | |
419 | } | |
cf6d1f09 | 420 | |
68ff9b9b NB |
421 | buf = kzalloc(cmd->data_length, GFP_KERNEL); |
422 | if (!buf) { | |
423 | pr_err("Unable to allocate compare_and_write buf\n"); | |
a2890087 NB |
424 | ret = TCM_OUT_OF_RESOURCES; |
425 | goto out; | |
68ff9b9b NB |
426 | } |
427 | ||
428 | write_sg = kzalloc(sizeof(struct scatterlist) * cmd->t_data_nents, | |
429 | GFP_KERNEL); | |
430 | if (!write_sg) { | |
431 | pr_err("Unable to allocate compare_and_write sg\n"); | |
432 | ret = TCM_OUT_OF_RESOURCES; | |
433 | goto out; | |
434 | } | |
435 | /* | |
436 | * Setup verify and write data payloads from total NumberLBAs. | |
437 | */ | |
438 | rc = sg_copy_to_buffer(cmd->t_data_sg, cmd->t_data_nents, buf, | |
439 | cmd->data_length); | |
440 | if (!rc) { | |
441 | pr_err("sg_copy_to_buffer() failed for compare_and_write\n"); | |
442 | ret = TCM_OUT_OF_RESOURCES; | |
443 | goto out; | |
444 | } | |
445 | /* | |
446 | * Compare against SCSI READ payload against verify payload | |
447 | */ | |
448 | for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, i) { | |
449 | addr = (unsigned char *)kmap_atomic(sg_page(sg)); | |
450 | if (!addr) { | |
451 | ret = TCM_OUT_OF_RESOURCES; | |
452 | goto out; | |
453 | } | |
454 | ||
455 | len = min(sg->length, compare_len); | |
456 | ||
457 | if (memcmp(addr, buf + offset, len)) { | |
458 | pr_warn("Detected MISCOMPARE for addr: %p buf: %p\n", | |
459 | addr, buf + offset); | |
460 | kunmap_atomic(addr); | |
461 | goto miscompare; | |
462 | } | |
463 | kunmap_atomic(addr); | |
464 | ||
465 | offset += len; | |
466 | compare_len -= len; | |
467 | if (!compare_len) | |
468 | break; | |
469 | } | |
470 | ||
471 | i = 0; | |
472 | len = cmd->t_task_nolb * block_size; | |
473 | sg_miter_start(&m, cmd->t_data_sg, cmd->t_data_nents, SG_MITER_TO_SG); | |
474 | /* | |
475 | * Currently assumes NoLB=1 and SGLs are PAGE_SIZE.. | |
476 | */ | |
477 | while (len) { | |
478 | sg_miter_next(&m); | |
479 | ||
480 | if (block_size < PAGE_SIZE) { | |
481 | sg_set_page(&write_sg[i], m.page, block_size, | |
482 | block_size); | |
483 | } else { | |
484 | sg_miter_next(&m); | |
485 | sg_set_page(&write_sg[i], m.page, block_size, | |
486 | 0); | |
487 | } | |
488 | len -= block_size; | |
489 | i++; | |
490 | } | |
491 | sg_miter_stop(&m); | |
492 | /* | |
493 | * Save the original SGL + nents values before updating to new | |
494 | * assignments, to be released in transport_free_pages() -> | |
495 | * transport_reset_sgl_orig() | |
496 | */ | |
497 | cmd->t_data_sg_orig = cmd->t_data_sg; | |
498 | cmd->t_data_sg = write_sg; | |
499 | cmd->t_data_nents_orig = cmd->t_data_nents; | |
500 | cmd->t_data_nents = 1; | |
501 | ||
502 | cmd->sam_task_attr = MSG_HEAD_TAG; | |
503 | cmd->transport_complete_callback = compare_and_write_post; | |
504 | /* | |
505 | * Now reset ->execute_cmd() to the normal sbc_execute_rw() handler | |
506 | * for submitting the adjusted SGL to write instance user-data. | |
507 | */ | |
508 | cmd->execute_cmd = sbc_execute_rw; | |
509 | ||
510 | spin_lock_irq(&cmd->t_state_lock); | |
511 | cmd->t_state = TRANSPORT_PROCESSING; | |
512 | cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT; | |
513 | spin_unlock_irq(&cmd->t_state_lock); | |
514 | ||
515 | __target_execute_cmd(cmd); | |
516 | ||
517 | kfree(buf); | |
518 | return ret; | |
519 | ||
520 | miscompare: | |
521 | pr_warn("Target/%s: Send MISCOMPARE check condition and sense\n", | |
522 | dev->transport->name); | |
523 | ret = TCM_MISCOMPARE_VERIFY; | |
524 | out: | |
525 | /* | |
526 | * In the MISCOMPARE or failure case, unlock ->caw_sem obtained in | |
527 | * sbc_compare_and_write() before the original READ I/O submission. | |
528 | */ | |
529 | up(&dev->caw_sem); | |
530 | kfree(write_sg); | |
531 | kfree(buf); | |
532 | return ret; | |
533 | } | |
534 | ||
535 | static sense_reason_t | |
536 | sbc_compare_and_write(struct se_cmd *cmd) | |
537 | { | |
538 | struct se_device *dev = cmd->se_dev; | |
539 | sense_reason_t ret; | |
540 | int rc; | |
541 | /* | |
542 | * Submit the READ first for COMPARE_AND_WRITE to perform the | |
543 | * comparision using SGLs at cmd->t_bidi_data_sg.. | |
544 | */ | |
545 | rc = down_interruptible(&dev->caw_sem); | |
546 | if ((rc != 0) || signal_pending(current)) { | |
547 | cmd->transport_complete_callback = NULL; | |
548 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
549 | } | |
b7191253 NB |
550 | /* |
551 | * Reset cmd->data_length to individual block_size in order to not | |
552 | * confuse backend drivers that depend on this value matching the | |
553 | * size of the I/O being submitted. | |
554 | */ | |
555 | cmd->data_length = cmd->t_task_nolb * dev->dev_attrib.block_size; | |
68ff9b9b NB |
556 | |
557 | ret = cmd->execute_rw(cmd, cmd->t_bidi_data_sg, cmd->t_bidi_data_nents, | |
558 | DMA_FROM_DEVICE); | |
559 | if (ret) { | |
560 | cmd->transport_complete_callback = NULL; | |
561 | up(&dev->caw_sem); | |
562 | return ret; | |
563 | } | |
564 | /* | |
565 | * Unlock of dev->caw_sem to occur in compare_and_write_callback() | |
566 | * upon MISCOMPARE, or in compare_and_write_done() upon completion | |
567 | * of WRITE instance user-data. | |
568 | */ | |
569 | return TCM_NO_SENSE; | |
570 | } | |
571 | ||
499bf77b NB |
572 | static bool |
573 | sbc_check_prot(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb, | |
574 | u32 sectors) | |
575 | { | |
576 | if (!cmd->t_prot_sg || !cmd->t_prot_nents) | |
577 | return true; | |
578 | ||
579 | switch (dev->dev_attrib.pi_prot_type) { | |
580 | case TARGET_DIF_TYPE3_PROT: | |
581 | if (!(cdb[1] & 0xe0)) | |
582 | return true; | |
583 | ||
584 | cmd->reftag_seed = 0xffffffff; | |
585 | break; | |
586 | case TARGET_DIF_TYPE2_PROT: | |
587 | if (cdb[1] & 0xe0) | |
588 | return false; | |
589 | ||
590 | cmd->reftag_seed = cmd->t_task_lba; | |
591 | break; | |
592 | case TARGET_DIF_TYPE1_PROT: | |
593 | if (!(cdb[1] & 0xe0)) | |
594 | return true; | |
595 | ||
596 | cmd->reftag_seed = cmd->t_task_lba; | |
597 | break; | |
598 | case TARGET_DIF_TYPE0_PROT: | |
599 | default: | |
600 | return true; | |
601 | } | |
602 | ||
603 | cmd->prot_type = dev->dev_attrib.pi_prot_type; | |
604 | cmd->prot_length = dev->prot_length * sectors; | |
605 | cmd->prot_handover = PROT_SEPERATED; | |
606 | ||
607 | return true; | |
608 | } | |
609 | ||
de103c93 CH |
610 | sense_reason_t |
611 | sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops) | |
d6e0175c | 612 | { |
d6e0175c CH |
613 | struct se_device *dev = cmd->se_dev; |
614 | unsigned char *cdb = cmd->t_task_cdb; | |
1fd032ee | 615 | unsigned int size; |
d6e0175c | 616 | u32 sectors = 0; |
de103c93 | 617 | sense_reason_t ret; |
d6e0175c CH |
618 | |
619 | switch (cdb[0]) { | |
620 | case READ_6: | |
621 | sectors = transport_get_sectors_6(cdb); | |
622 | cmd->t_task_lba = transport_lba_21(cdb); | |
623 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
a82a9538 NB |
624 | cmd->execute_rw = ops->execute_rw; |
625 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c CH |
626 | break; |
627 | case READ_10: | |
628 | sectors = transport_get_sectors_10(cdb); | |
629 | cmd->t_task_lba = transport_lba_32(cdb); | |
499bf77b NB |
630 | |
631 | if (!sbc_check_prot(dev, cmd, cdb, sectors)) | |
632 | return TCM_UNSUPPORTED_SCSI_OPCODE; | |
633 | ||
d6e0175c | 634 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
a82a9538 NB |
635 | cmd->execute_rw = ops->execute_rw; |
636 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c CH |
637 | break; |
638 | case READ_12: | |
639 | sectors = transport_get_sectors_12(cdb); | |
640 | cmd->t_task_lba = transport_lba_32(cdb); | |
499bf77b NB |
641 | |
642 | if (!sbc_check_prot(dev, cmd, cdb, sectors)) | |
643 | return TCM_UNSUPPORTED_SCSI_OPCODE; | |
644 | ||
d6e0175c | 645 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
a82a9538 NB |
646 | cmd->execute_rw = ops->execute_rw; |
647 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c CH |
648 | break; |
649 | case READ_16: | |
650 | sectors = transport_get_sectors_16(cdb); | |
651 | cmd->t_task_lba = transport_lba_64(cdb); | |
499bf77b NB |
652 | |
653 | if (!sbc_check_prot(dev, cmd, cdb, sectors)) | |
654 | return TCM_UNSUPPORTED_SCSI_OPCODE; | |
655 | ||
d6e0175c | 656 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
a82a9538 NB |
657 | cmd->execute_rw = ops->execute_rw; |
658 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c CH |
659 | break; |
660 | case WRITE_6: | |
661 | sectors = transport_get_sectors_6(cdb); | |
662 | cmd->t_task_lba = transport_lba_21(cdb); | |
663 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
a82a9538 NB |
664 | cmd->execute_rw = ops->execute_rw; |
665 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c CH |
666 | break; |
667 | case WRITE_10: | |
668 | case WRITE_VERIFY: | |
669 | sectors = transport_get_sectors_10(cdb); | |
670 | cmd->t_task_lba = transport_lba_32(cdb); | |
499bf77b NB |
671 | |
672 | if (!sbc_check_prot(dev, cmd, cdb, sectors)) | |
673 | return TCM_UNSUPPORTED_SCSI_OPCODE; | |
674 | ||
d6e0175c CH |
675 | if (cdb[1] & 0x8) |
676 | cmd->se_cmd_flags |= SCF_FUA; | |
677 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
a82a9538 NB |
678 | cmd->execute_rw = ops->execute_rw; |
679 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c CH |
680 | break; |
681 | case WRITE_12: | |
682 | sectors = transport_get_sectors_12(cdb); | |
683 | cmd->t_task_lba = transport_lba_32(cdb); | |
499bf77b NB |
684 | |
685 | if (!sbc_check_prot(dev, cmd, cdb, sectors)) | |
686 | return TCM_UNSUPPORTED_SCSI_OPCODE; | |
687 | ||
d6e0175c CH |
688 | if (cdb[1] & 0x8) |
689 | cmd->se_cmd_flags |= SCF_FUA; | |
690 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
a82a9538 NB |
691 | cmd->execute_rw = ops->execute_rw; |
692 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c CH |
693 | break; |
694 | case WRITE_16: | |
695 | sectors = transport_get_sectors_16(cdb); | |
696 | cmd->t_task_lba = transport_lba_64(cdb); | |
499bf77b NB |
697 | |
698 | if (!sbc_check_prot(dev, cmd, cdb, sectors)) | |
699 | return TCM_UNSUPPORTED_SCSI_OPCODE; | |
700 | ||
d6e0175c CH |
701 | if (cdb[1] & 0x8) |
702 | cmd->se_cmd_flags |= SCF_FUA; | |
703 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
a82a9538 NB |
704 | cmd->execute_rw = ops->execute_rw; |
705 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c CH |
706 | break; |
707 | case XDWRITEREAD_10: | |
de103c93 | 708 | if (cmd->data_direction != DMA_TO_DEVICE || |
d6e0175c | 709 | !(cmd->se_cmd_flags & SCF_BIDI)) |
de103c93 | 710 | return TCM_INVALID_CDB_FIELD; |
d6e0175c CH |
711 | sectors = transport_get_sectors_10(cdb); |
712 | ||
713 | cmd->t_task_lba = transport_lba_32(cdb); | |
714 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
715 | ||
716 | /* | |
717 | * Setup BIDI XOR callback to be run after I/O completion. | |
718 | */ | |
a82a9538 NB |
719 | cmd->execute_rw = ops->execute_rw; |
720 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c CH |
721 | cmd->transport_complete_callback = &xdreadwrite_callback; |
722 | if (cdb[1] & 0x8) | |
723 | cmd->se_cmd_flags |= SCF_FUA; | |
724 | break; | |
725 | case VARIABLE_LENGTH_CMD: | |
726 | { | |
727 | u16 service_action = get_unaligned_be16(&cdb[8]); | |
728 | switch (service_action) { | |
729 | case XDWRITEREAD_32: | |
730 | sectors = transport_get_sectors_32(cdb); | |
731 | ||
732 | /* | |
733 | * Use WRITE_32 and READ_32 opcodes for the emulated | |
734 | * XDWRITE_READ_32 logic. | |
735 | */ | |
736 | cmd->t_task_lba = transport_lba_64_ext(cdb); | |
737 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
738 | ||
739 | /* | |
740 | * Setup BIDI XOR callback to be run during after I/O | |
741 | * completion. | |
742 | */ | |
a82a9538 NB |
743 | cmd->execute_rw = ops->execute_rw; |
744 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c CH |
745 | cmd->transport_complete_callback = &xdreadwrite_callback; |
746 | if (cdb[1] & 0x8) | |
747 | cmd->se_cmd_flags |= SCF_FUA; | |
748 | break; | |
749 | case WRITE_SAME_32: | |
750 | sectors = transport_get_sectors_32(cdb); | |
751 | if (!sectors) { | |
752 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not" | |
753 | " supported\n"); | |
de103c93 | 754 | return TCM_INVALID_CDB_FIELD; |
d6e0175c CH |
755 | } |
756 | ||
1fd032ee | 757 | size = sbc_get_size(cmd, 1); |
d6e0175c CH |
758 | cmd->t_task_lba = get_unaligned_be64(&cdb[12]); |
759 | ||
cd063bef | 760 | ret = sbc_setup_write_same(cmd, &cdb[10], ops); |
6b64e1fe | 761 | if (ret) |
cd063bef | 762 | return ret; |
d6e0175c CH |
763 | break; |
764 | default: | |
765 | pr_err("VARIABLE_LENGTH_CMD service action" | |
766 | " 0x%04x not supported\n", service_action); | |
de103c93 | 767 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
d6e0175c CH |
768 | } |
769 | break; | |
770 | } | |
68ff9b9b NB |
771 | case COMPARE_AND_WRITE: |
772 | sectors = cdb[13]; | |
773 | /* | |
774 | * Currently enforce COMPARE_AND_WRITE for a single sector | |
775 | */ | |
776 | if (sectors > 1) { | |
777 | pr_err("COMPARE_AND_WRITE contains NoLB: %u greater" | |
778 | " than 1\n", sectors); | |
779 | return TCM_INVALID_CDB_FIELD; | |
780 | } | |
781 | /* | |
782 | * Double size because we have two buffers, note that | |
783 | * zero is not an error.. | |
784 | */ | |
785 | size = 2 * sbc_get_size(cmd, sectors); | |
786 | cmd->t_task_lba = get_unaligned_be64(&cdb[2]); | |
787 | cmd->t_task_nolb = sectors; | |
788 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB | SCF_COMPARE_AND_WRITE; | |
789 | cmd->execute_rw = ops->execute_rw; | |
790 | cmd->execute_cmd = sbc_compare_and_write; | |
791 | cmd->transport_complete_callback = compare_and_write_callback; | |
792 | break; | |
d6e0175c | 793 | case READ_CAPACITY: |
1fd032ee CH |
794 | size = READ_CAP_LEN; |
795 | cmd->execute_cmd = sbc_emulate_readcapacity; | |
d6e0175c CH |
796 | break; |
797 | case SERVICE_ACTION_IN: | |
798 | switch (cmd->t_task_cdb[1] & 0x1f) { | |
799 | case SAI_READ_CAPACITY_16: | |
1fd032ee | 800 | cmd->execute_cmd = sbc_emulate_readcapacity_16; |
d6e0175c | 801 | break; |
c66094bf HR |
802 | case SAI_REPORT_REFERRALS: |
803 | cmd->execute_cmd = target_emulate_report_referrals; | |
804 | break; | |
d6e0175c CH |
805 | default: |
806 | pr_err("Unsupported SA: 0x%02x\n", | |
807 | cmd->t_task_cdb[1] & 0x1f); | |
de103c93 | 808 | return TCM_INVALID_CDB_FIELD; |
d6e0175c | 809 | } |
1fd032ee | 810 | size = (cdb[10] << 24) | (cdb[11] << 16) | |
d6e0175c CH |
811 | (cdb[12] << 8) | cdb[13]; |
812 | break; | |
813 | case SYNCHRONIZE_CACHE: | |
814 | case SYNCHRONIZE_CACHE_16: | |
882e3f8e HR |
815 | if (!ops->execute_sync_cache) { |
816 | size = 0; | |
817 | cmd->execute_cmd = sbc_emulate_noop; | |
818 | break; | |
819 | } | |
ad67f0d9 | 820 | |
d6e0175c CH |
821 | /* |
822 | * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE | |
823 | */ | |
824 | if (cdb[0] == SYNCHRONIZE_CACHE) { | |
825 | sectors = transport_get_sectors_10(cdb); | |
826 | cmd->t_task_lba = transport_lba_32(cdb); | |
827 | } else { | |
828 | sectors = transport_get_sectors_16(cdb); | |
829 | cmd->t_task_lba = transport_lba_64(cdb); | |
830 | } | |
831 | ||
1fd032ee | 832 | size = sbc_get_size(cmd, sectors); |
d6e0175c CH |
833 | |
834 | /* | |
835 | * Check to ensure that LBA + Range does not exceed past end of | |
836 | * device for IBLOCK and FILEIO ->do_sync_cache() backend calls | |
837 | */ | |
838 | if (cmd->t_task_lba || sectors) { | |
839 | if (sbc_check_valid_sectors(cmd) < 0) | |
33633676 | 840 | return TCM_ADDRESS_OUT_OF_RANGE; |
d6e0175c | 841 | } |
ad67f0d9 | 842 | cmd->execute_cmd = ops->execute_sync_cache; |
d6e0175c CH |
843 | break; |
844 | case UNMAP: | |
14150a6b | 845 | if (!ops->execute_unmap) |
de103c93 | 846 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
14150a6b | 847 | |
1fd032ee | 848 | size = get_unaligned_be16(&cdb[7]); |
14150a6b | 849 | cmd->execute_cmd = ops->execute_unmap; |
d6e0175c CH |
850 | break; |
851 | case WRITE_SAME_16: | |
852 | sectors = transport_get_sectors_16(cdb); | |
853 | if (!sectors) { | |
854 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); | |
de103c93 | 855 | return TCM_INVALID_CDB_FIELD; |
d6e0175c CH |
856 | } |
857 | ||
1fd032ee | 858 | size = sbc_get_size(cmd, 1); |
d6e0175c CH |
859 | cmd->t_task_lba = get_unaligned_be64(&cdb[2]); |
860 | ||
cd063bef | 861 | ret = sbc_setup_write_same(cmd, &cdb[1], ops); |
6b64e1fe | 862 | if (ret) |
cd063bef | 863 | return ret; |
d6e0175c CH |
864 | break; |
865 | case WRITE_SAME: | |
866 | sectors = transport_get_sectors_10(cdb); | |
867 | if (!sectors) { | |
868 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); | |
de103c93 | 869 | return TCM_INVALID_CDB_FIELD; |
d6e0175c CH |
870 | } |
871 | ||
1fd032ee | 872 | size = sbc_get_size(cmd, 1); |
d6e0175c CH |
873 | cmd->t_task_lba = get_unaligned_be32(&cdb[2]); |
874 | ||
875 | /* | |
876 | * Follow sbcr26 with WRITE_SAME (10) and check for the existence | |
877 | * of byte 1 bit 3 UNMAP instead of original reserved field | |
878 | */ | |
cd063bef | 879 | ret = sbc_setup_write_same(cmd, &cdb[1], ops); |
6b64e1fe | 880 | if (ret) |
cd063bef | 881 | return ret; |
d6e0175c CH |
882 | break; |
883 | case VERIFY: | |
1fd032ee | 884 | size = 0; |
1920ed61 | 885 | cmd->execute_cmd = sbc_emulate_noop; |
d6e0175c | 886 | break; |
1a1ff38c BK |
887 | case REZERO_UNIT: |
888 | case SEEK_6: | |
889 | case SEEK_10: | |
890 | /* | |
891 | * There are still clients out there which use these old SCSI-2 | |
892 | * commands. This mainly happens when running VMs with legacy | |
893 | * guest systems, connected via SCSI command pass-through to | |
894 | * iSCSI targets. Make them happy and return status GOOD. | |
895 | */ | |
896 | size = 0; | |
897 | cmd->execute_cmd = sbc_emulate_noop; | |
898 | break; | |
d6e0175c | 899 | default: |
1fd032ee | 900 | ret = spc_parse_cdb(cmd, &size); |
d6e0175c CH |
901 | if (ret) |
902 | return ret; | |
903 | } | |
904 | ||
905 | /* reject any command that we don't have a handler for */ | |
906 | if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) && !cmd->execute_cmd) | |
de103c93 | 907 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
d6e0175c CH |
908 | |
909 | if (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) { | |
1fd032ee CH |
910 | unsigned long long end_lba; |
911 | ||
0fd97ccf | 912 | if (sectors > dev->dev_attrib.fabric_max_sectors) { |
d6e0175c CH |
913 | printk_ratelimited(KERN_ERR "SCSI OP %02xh with too" |
914 | " big sectors %u exceeds fabric_max_sectors:" | |
915 | " %u\n", cdb[0], sectors, | |
0fd97ccf | 916 | dev->dev_attrib.fabric_max_sectors); |
de103c93 | 917 | return TCM_INVALID_CDB_FIELD; |
d6e0175c | 918 | } |
0fd97ccf | 919 | if (sectors > dev->dev_attrib.hw_max_sectors) { |
d6e0175c CH |
920 | printk_ratelimited(KERN_ERR "SCSI OP %02xh with too" |
921 | " big sectors %u exceeds backend hw_max_sectors:" | |
922 | " %u\n", cdb[0], sectors, | |
0fd97ccf | 923 | dev->dev_attrib.hw_max_sectors); |
de103c93 | 924 | return TCM_INVALID_CDB_FIELD; |
d6e0175c CH |
925 | } |
926 | ||
1fd032ee CH |
927 | end_lba = dev->transport->get_blocks(dev) + 1; |
928 | if (cmd->t_task_lba + sectors > end_lba) { | |
929 | pr_err("cmd exceeds last lba %llu " | |
930 | "(lba %llu, sectors %u)\n", | |
931 | end_lba, cmd->t_task_lba, sectors); | |
09ceadc7 | 932 | return TCM_ADDRESS_OUT_OF_RANGE; |
1fd032ee CH |
933 | } |
934 | ||
68ff9b9b NB |
935 | if (!(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) |
936 | size = sbc_get_size(cmd, sectors); | |
d6e0175c CH |
937 | } |
938 | ||
de103c93 | 939 | return target_cmd_size_check(cmd, size); |
d6e0175c CH |
940 | } |
941 | EXPORT_SYMBOL(sbc_parse_cdb); | |
6f23ac8a | 942 | |
6f23ac8a CH |
943 | u32 sbc_get_device_type(struct se_device *dev) |
944 | { | |
945 | return TYPE_DISK; | |
946 | } | |
947 | EXPORT_SYMBOL(sbc_get_device_type); | |
86d71829 AH |
948 | |
949 | sense_reason_t | |
950 | sbc_execute_unmap(struct se_cmd *cmd, | |
951 | sense_reason_t (*do_unmap_fn)(struct se_cmd *, void *, | |
952 | sector_t, sector_t), | |
953 | void *priv) | |
954 | { | |
955 | struct se_device *dev = cmd->se_dev; | |
956 | unsigned char *buf, *ptr = NULL; | |
957 | sector_t lba; | |
958 | int size; | |
959 | u32 range; | |
960 | sense_reason_t ret = 0; | |
961 | int dl, bd_dl; | |
962 | ||
963 | /* We never set ANC_SUP */ | |
964 | if (cmd->t_task_cdb[1]) | |
965 | return TCM_INVALID_CDB_FIELD; | |
966 | ||
967 | if (cmd->data_length == 0) { | |
968 | target_complete_cmd(cmd, SAM_STAT_GOOD); | |
969 | return 0; | |
970 | } | |
971 | ||
972 | if (cmd->data_length < 8) { | |
973 | pr_warn("UNMAP parameter list length %u too small\n", | |
974 | cmd->data_length); | |
975 | return TCM_PARAMETER_LIST_LENGTH_ERROR; | |
976 | } | |
977 | ||
978 | buf = transport_kmap_data_sg(cmd); | |
979 | if (!buf) | |
980 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
981 | ||
982 | dl = get_unaligned_be16(&buf[0]); | |
983 | bd_dl = get_unaligned_be16(&buf[2]); | |
984 | ||
985 | size = cmd->data_length - 8; | |
986 | if (bd_dl > size) | |
987 | pr_warn("UNMAP parameter list length %u too small, ignoring bd_dl %u\n", | |
988 | cmd->data_length, bd_dl); | |
989 | else | |
990 | size = bd_dl; | |
991 | ||
992 | if (size / 16 > dev->dev_attrib.max_unmap_block_desc_count) { | |
993 | ret = TCM_INVALID_PARAMETER_LIST; | |
994 | goto err; | |
995 | } | |
996 | ||
997 | /* First UNMAP block descriptor starts at 8 byte offset */ | |
998 | ptr = &buf[8]; | |
999 | pr_debug("UNMAP: Sub: %s Using dl: %u bd_dl: %u size: %u" | |
1000 | " ptr: %p\n", dev->transport->name, dl, bd_dl, size, ptr); | |
1001 | ||
1002 | while (size >= 16) { | |
1003 | lba = get_unaligned_be64(&ptr[0]); | |
1004 | range = get_unaligned_be32(&ptr[8]); | |
1005 | pr_debug("UNMAP: Using lba: %llu and range: %u\n", | |
1006 | (unsigned long long)lba, range); | |
1007 | ||
1008 | if (range > dev->dev_attrib.max_unmap_lba_count) { | |
1009 | ret = TCM_INVALID_PARAMETER_LIST; | |
1010 | goto err; | |
1011 | } | |
1012 | ||
1013 | if (lba + range > dev->transport->get_blocks(dev) + 1) { | |
1014 | ret = TCM_ADDRESS_OUT_OF_RANGE; | |
1015 | goto err; | |
1016 | } | |
1017 | ||
1018 | ret = do_unmap_fn(cmd, priv, lba, range); | |
1019 | if (ret) | |
1020 | goto err; | |
1021 | ||
1022 | ptr += 16; | |
1023 | size -= 16; | |
1024 | } | |
1025 | ||
1026 | err: | |
1027 | transport_kunmap_data_sg(cmd); | |
1028 | if (!ret) | |
1029 | target_complete_cmd(cmd, GOOD); | |
1030 | return ret; | |
1031 | } | |
1032 | EXPORT_SYMBOL(sbc_execute_unmap); | |
41861fa8 NB |
1033 | |
1034 | static sense_reason_t | |
1035 | sbc_dif_v1_verify(struct se_device *dev, struct se_dif_v1_tuple *sdt, | |
1036 | const void *p, sector_t sector, unsigned int ei_lba) | |
1037 | { | |
1038 | int block_size = dev->dev_attrib.block_size; | |
1039 | __be16 csum; | |
1040 | ||
1041 | csum = cpu_to_be16(crc_t10dif(p, block_size)); | |
1042 | ||
1043 | if (sdt->guard_tag != csum) { | |
1044 | pr_err("DIFv1 checksum failed on sector %llu guard tag 0x%04x" | |
1045 | " csum 0x%04x\n", (unsigned long long)sector, | |
1046 | be16_to_cpu(sdt->guard_tag), be16_to_cpu(csum)); | |
1047 | return TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED; | |
1048 | } | |
1049 | ||
1050 | if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE1_PROT && | |
1051 | be32_to_cpu(sdt->ref_tag) != (sector & 0xffffffff)) { | |
1052 | pr_err("DIFv1 Type 1 reference failed on sector: %llu tag: 0x%08x" | |
1053 | " sector MSB: 0x%08x\n", (unsigned long long)sector, | |
1054 | be32_to_cpu(sdt->ref_tag), (u32)(sector & 0xffffffff)); | |
1055 | return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED; | |
1056 | } | |
1057 | ||
1058 | if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE2_PROT && | |
1059 | be32_to_cpu(sdt->ref_tag) != ei_lba) { | |
1060 | pr_err("DIFv1 Type 2 reference failed on sector: %llu tag: 0x%08x" | |
1061 | " ei_lba: 0x%08x\n", (unsigned long long)sector, | |
1062 | be32_to_cpu(sdt->ref_tag), ei_lba); | |
1063 | return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED; | |
1064 | } | |
1065 | ||
1066 | return 0; | |
1067 | } | |
1068 | ||
1069 | static void | |
1070 | sbc_dif_copy_prot(struct se_cmd *cmd, unsigned int sectors, bool read, | |
1071 | struct scatterlist *sg, int sg_off) | |
1072 | { | |
1073 | struct se_device *dev = cmd->se_dev; | |
1074 | struct scatterlist *psg; | |
1075 | void *paddr, *addr; | |
1076 | unsigned int i, len, left; | |
1077 | ||
1078 | left = sectors * dev->prot_length; | |
1079 | ||
1080 | for_each_sg(cmd->t_prot_sg, psg, cmd->t_prot_nents, i) { | |
1081 | ||
1082 | len = min(psg->length, left); | |
1083 | paddr = kmap_atomic(sg_page(psg)) + psg->offset; | |
1084 | addr = kmap_atomic(sg_page(sg)) + sg_off; | |
1085 | ||
1086 | if (read) | |
1087 | memcpy(paddr, addr, len); | |
1088 | else | |
1089 | memcpy(addr, paddr, len); | |
1090 | ||
1091 | left -= len; | |
1092 | kunmap_atomic(paddr); | |
1093 | kunmap_atomic(addr); | |
1094 | } | |
1095 | } | |
1096 | ||
1097 | sense_reason_t | |
1098 | sbc_dif_verify_write(struct se_cmd *cmd, sector_t start, unsigned int sectors, | |
1099 | unsigned int ei_lba, struct scatterlist *sg, int sg_off) | |
1100 | { | |
1101 | struct se_device *dev = cmd->se_dev; | |
1102 | struct se_dif_v1_tuple *sdt; | |
1103 | struct scatterlist *dsg, *psg = cmd->t_prot_sg; | |
1104 | sector_t sector = start; | |
1105 | void *daddr, *paddr; | |
1106 | int i, j, offset = 0; | |
1107 | sense_reason_t rc; | |
1108 | ||
1109 | for_each_sg(cmd->t_data_sg, dsg, cmd->t_data_nents, i) { | |
1110 | daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; | |
1111 | paddr = kmap_atomic(sg_page(psg)) + psg->offset; | |
1112 | ||
1113 | for (j = 0; j < dsg->length; j += dev->dev_attrib.block_size) { | |
1114 | ||
1115 | if (offset >= psg->length) { | |
1116 | kunmap_atomic(paddr); | |
1117 | psg = sg_next(psg); | |
1118 | paddr = kmap_atomic(sg_page(psg)) + psg->offset; | |
1119 | offset = 0; | |
1120 | } | |
1121 | ||
1122 | sdt = paddr + offset; | |
1123 | ||
1124 | pr_debug("DIF WRITE sector: %llu guard_tag: 0x%04x" | |
1125 | " app_tag: 0x%04x ref_tag: %u\n", | |
1126 | (unsigned long long)sector, sdt->guard_tag, | |
1127 | sdt->app_tag, be32_to_cpu(sdt->ref_tag)); | |
1128 | ||
1129 | rc = sbc_dif_v1_verify(dev, sdt, daddr + j, sector, | |
1130 | ei_lba); | |
1131 | if (rc) { | |
1132 | kunmap_atomic(paddr); | |
1133 | kunmap_atomic(daddr); | |
76736db3 | 1134 | cmd->bad_sector = sector; |
41861fa8 NB |
1135 | return rc; |
1136 | } | |
1137 | ||
1138 | sector++; | |
1139 | ei_lba++; | |
1140 | offset += sizeof(struct se_dif_v1_tuple); | |
1141 | } | |
1142 | ||
1143 | kunmap_atomic(paddr); | |
1144 | kunmap_atomic(daddr); | |
1145 | } | |
1146 | sbc_dif_copy_prot(cmd, sectors, false, sg, sg_off); | |
1147 | ||
1148 | return 0; | |
1149 | } | |
1150 | EXPORT_SYMBOL(sbc_dif_verify_write); | |
1151 | ||
1152 | sense_reason_t | |
1153 | sbc_dif_verify_read(struct se_cmd *cmd, sector_t start, unsigned int sectors, | |
1154 | unsigned int ei_lba, struct scatterlist *sg, int sg_off) | |
1155 | { | |
1156 | struct se_device *dev = cmd->se_dev; | |
1157 | struct se_dif_v1_tuple *sdt; | |
1158 | struct scatterlist *dsg; | |
1159 | sector_t sector = start; | |
1160 | void *daddr, *paddr; | |
1161 | int i, j, offset = sg_off; | |
1162 | sense_reason_t rc; | |
1163 | ||
1164 | for_each_sg(cmd->t_data_sg, dsg, cmd->t_data_nents, i) { | |
1165 | daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; | |
1166 | paddr = kmap_atomic(sg_page(sg)) + sg->offset; | |
1167 | ||
1168 | for (j = 0; j < dsg->length; j += dev->dev_attrib.block_size) { | |
1169 | ||
1170 | if (offset >= sg->length) { | |
1171 | kunmap_atomic(paddr); | |
1172 | sg = sg_next(sg); | |
1173 | paddr = kmap_atomic(sg_page(sg)) + sg->offset; | |
1174 | offset = 0; | |
1175 | } | |
1176 | ||
1177 | sdt = paddr + offset; | |
1178 | ||
1179 | pr_debug("DIF READ sector: %llu guard_tag: 0x%04x" | |
1180 | " app_tag: 0x%04x ref_tag: %u\n", | |
1181 | (unsigned long long)sector, sdt->guard_tag, | |
1182 | sdt->app_tag, be32_to_cpu(sdt->ref_tag)); | |
1183 | ||
1184 | if (sdt->app_tag == cpu_to_be16(0xffff)) { | |
1185 | sector++; | |
1186 | offset += sizeof(struct se_dif_v1_tuple); | |
1187 | continue; | |
1188 | } | |
1189 | ||
1190 | rc = sbc_dif_v1_verify(dev, sdt, daddr + j, sector, | |
1191 | ei_lba); | |
1192 | if (rc) { | |
1193 | kunmap_atomic(paddr); | |
1194 | kunmap_atomic(daddr); | |
76736db3 | 1195 | cmd->bad_sector = sector; |
41861fa8 NB |
1196 | return rc; |
1197 | } | |
1198 | ||
1199 | sector++; | |
1200 | ei_lba++; | |
1201 | offset += sizeof(struct se_dif_v1_tuple); | |
1202 | } | |
1203 | ||
1204 | kunmap_atomic(paddr); | |
1205 | kunmap_atomic(daddr); | |
1206 | } | |
1207 | sbc_dif_copy_prot(cmd, sectors, true, sg, sg_off); | |
1208 | ||
1209 | return 0; | |
1210 | } | |
1211 | EXPORT_SYMBOL(sbc_dif_verify_read); |