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Commit | Line | Data |
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d6e0175c CH |
1 | /* |
2 | * SCSI Block Commands (SBC) parsing and emulation. | |
3 | * | |
4c76251e | 4 | * (c) Copyright 2002-2013 Datera, Inc. |
d6e0175c CH |
5 | * |
6 | * Nicholas A. Bellinger <nab@kernel.org> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2 of the License, or | |
11 | * (at your option) any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
21 | */ | |
22 | ||
23 | #include <linux/kernel.h> | |
24 | #include <linux/module.h> | |
25 | #include <linux/ratelimit.h> | |
41861fa8 | 26 | #include <linux/crc-t10dif.h> |
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 | |
afd73f1b NB |
39 | static sense_reason_t |
40 | sbc_check_prot(struct se_device *, struct se_cmd *, unsigned char *, u32, bool); | |
41 | ||
de103c93 CH |
42 | static sense_reason_t |
43 | sbc_emulate_readcapacity(struct se_cmd *cmd) | |
1fd032ee CH |
44 | { |
45 | struct se_device *dev = cmd->se_dev; | |
8dc8632a | 46 | unsigned char *cdb = cmd->t_task_cdb; |
1fd032ee | 47 | unsigned long long blocks_long = dev->transport->get_blocks(dev); |
a50da144 PB |
48 | unsigned char *rbuf; |
49 | unsigned char buf[8]; | |
1fd032ee CH |
50 | u32 blocks; |
51 | ||
8dc8632a RD |
52 | /* |
53 | * SBC-2 says: | |
54 | * If the PMI bit is set to zero and the LOGICAL BLOCK | |
55 | * ADDRESS field is not set to zero, the device server shall | |
56 | * terminate the command with CHECK CONDITION status with | |
57 | * the sense key set to ILLEGAL REQUEST and the additional | |
58 | * sense code set to INVALID FIELD IN CDB. | |
59 | * | |
60 | * In SBC-3, these fields are obsolete, but some SCSI | |
61 | * compliance tests actually check this, so we might as well | |
62 | * follow SBC-2. | |
63 | */ | |
64 | if (!(cdb[8] & 1) && !!(cdb[2] | cdb[3] | cdb[4] | cdb[5])) | |
65 | return TCM_INVALID_CDB_FIELD; | |
66 | ||
1fd032ee CH |
67 | if (blocks_long >= 0x00000000ffffffff) |
68 | blocks = 0xffffffff; | |
69 | else | |
70 | blocks = (u32)blocks_long; | |
71 | ||
1fd032ee CH |
72 | buf[0] = (blocks >> 24) & 0xff; |
73 | buf[1] = (blocks >> 16) & 0xff; | |
74 | buf[2] = (blocks >> 8) & 0xff; | |
75 | buf[3] = blocks & 0xff; | |
0fd97ccf CH |
76 | buf[4] = (dev->dev_attrib.block_size >> 24) & 0xff; |
77 | buf[5] = (dev->dev_attrib.block_size >> 16) & 0xff; | |
78 | buf[6] = (dev->dev_attrib.block_size >> 8) & 0xff; | |
79 | buf[7] = dev->dev_attrib.block_size & 0xff; | |
1fd032ee | 80 | |
a50da144 | 81 | rbuf = transport_kmap_data_sg(cmd); |
8b4b0dcb NB |
82 | if (rbuf) { |
83 | memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length)); | |
84 | transport_kunmap_data_sg(cmd); | |
85 | } | |
1fd032ee | 86 | |
2426bd45 | 87 | target_complete_cmd_with_length(cmd, GOOD, 8); |
1fd032ee CH |
88 | return 0; |
89 | } | |
90 | ||
de103c93 CH |
91 | static sense_reason_t |
92 | sbc_emulate_readcapacity_16(struct se_cmd *cmd) | |
1fd032ee CH |
93 | { |
94 | struct se_device *dev = cmd->se_dev; | |
2d335983 | 95 | struct se_session *sess = cmd->se_sess; |
a50da144 PB |
96 | unsigned char *rbuf; |
97 | unsigned char buf[32]; | |
1fd032ee CH |
98 | unsigned long long blocks = dev->transport->get_blocks(dev); |
99 | ||
a50da144 | 100 | memset(buf, 0, sizeof(buf)); |
1fd032ee CH |
101 | buf[0] = (blocks >> 56) & 0xff; |
102 | buf[1] = (blocks >> 48) & 0xff; | |
103 | buf[2] = (blocks >> 40) & 0xff; | |
104 | buf[3] = (blocks >> 32) & 0xff; | |
105 | buf[4] = (blocks >> 24) & 0xff; | |
106 | buf[5] = (blocks >> 16) & 0xff; | |
107 | buf[6] = (blocks >> 8) & 0xff; | |
108 | buf[7] = blocks & 0xff; | |
0fd97ccf CH |
109 | buf[8] = (dev->dev_attrib.block_size >> 24) & 0xff; |
110 | buf[9] = (dev->dev_attrib.block_size >> 16) & 0xff; | |
111 | buf[10] = (dev->dev_attrib.block_size >> 8) & 0xff; | |
112 | buf[11] = dev->dev_attrib.block_size & 0xff; | |
56dac14c NB |
113 | /* |
114 | * Set P_TYPE and PROT_EN bits for DIF support | |
115 | */ | |
2d335983 NB |
116 | if (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) { |
117 | if (dev->dev_attrib.pi_prot_type) | |
118 | buf[12] = (dev->dev_attrib.pi_prot_type - 1) << 1 | 0x1; | |
119 | } | |
7f7caf6a AG |
120 | |
121 | if (dev->transport->get_lbppbe) | |
122 | buf[13] = dev->transport->get_lbppbe(dev) & 0x0f; | |
123 | ||
124 | if (dev->transport->get_alignment_offset_lbas) { | |
125 | u16 lalba = dev->transport->get_alignment_offset_lbas(dev); | |
126 | buf[14] = (lalba >> 8) & 0x3f; | |
127 | buf[15] = lalba & 0xff; | |
128 | } | |
129 | ||
1fd032ee CH |
130 | /* |
131 | * Set Thin Provisioning Enable bit following sbc3r22 in section | |
132 | * READ CAPACITY (16) byte 14 if emulate_tpu or emulate_tpws is enabled. | |
133 | */ | |
0fd97ccf | 134 | if (dev->dev_attrib.emulate_tpu || dev->dev_attrib.emulate_tpws) |
7f7caf6a | 135 | buf[14] |= 0x80; |
1fd032ee | 136 | |
a50da144 | 137 | rbuf = transport_kmap_data_sg(cmd); |
8b4b0dcb NB |
138 | if (rbuf) { |
139 | memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length)); | |
140 | transport_kunmap_data_sg(cmd); | |
141 | } | |
1fd032ee | 142 | |
2426bd45 | 143 | target_complete_cmd_with_length(cmd, GOOD, 32); |
1fd032ee CH |
144 | return 0; |
145 | } | |
146 | ||
972b29c8 | 147 | sector_t sbc_get_write_same_sectors(struct se_cmd *cmd) |
1fd032ee | 148 | { |
1fd032ee | 149 | u32 num_blocks; |
1fd032ee CH |
150 | |
151 | if (cmd->t_task_cdb[0] == WRITE_SAME) | |
152 | num_blocks = get_unaligned_be16(&cmd->t_task_cdb[7]); | |
153 | else if (cmd->t_task_cdb[0] == WRITE_SAME_16) | |
154 | num_blocks = get_unaligned_be32(&cmd->t_task_cdb[10]); | |
155 | else /* WRITE_SAME_32 via VARIABLE_LENGTH_CMD */ | |
156 | num_blocks = get_unaligned_be32(&cmd->t_task_cdb[28]); | |
157 | ||
158 | /* | |
159 | * Use the explicit range when non zero is supplied, otherwise calculate | |
160 | * the remaining range based on ->get_blocks() - starting LBA. | |
161 | */ | |
6f974e8c CH |
162 | if (num_blocks) |
163 | return num_blocks; | |
1fd032ee | 164 | |
6f974e8c CH |
165 | return cmd->se_dev->transport->get_blocks(cmd->se_dev) - |
166 | cmd->t_task_lba + 1; | |
1fd032ee | 167 | } |
972b29c8 | 168 | EXPORT_SYMBOL(sbc_get_write_same_sectors); |
1fd032ee | 169 | |
de103c93 | 170 | static sense_reason_t |
1920ed61 | 171 | sbc_emulate_noop(struct se_cmd *cmd) |
1a1ff38c BK |
172 | { |
173 | target_complete_cmd(cmd, GOOD); | |
174 | return 0; | |
175 | } | |
176 | ||
d6e0175c CH |
177 | static inline u32 sbc_get_size(struct se_cmd *cmd, u32 sectors) |
178 | { | |
0fd97ccf | 179 | return cmd->se_dev->dev_attrib.block_size * sectors; |
d6e0175c CH |
180 | } |
181 | ||
d6e0175c CH |
182 | static inline u32 transport_get_sectors_6(unsigned char *cdb) |
183 | { | |
184 | /* | |
185 | * Use 8-bit sector value. SBC-3 says: | |
186 | * | |
187 | * A TRANSFER LENGTH field set to zero specifies that 256 | |
188 | * logical blocks shall be written. Any other value | |
189 | * specifies the number of logical blocks that shall be | |
190 | * written. | |
191 | */ | |
192 | return cdb[4] ? : 256; | |
193 | } | |
194 | ||
195 | static inline u32 transport_get_sectors_10(unsigned char *cdb) | |
196 | { | |
197 | return (u32)(cdb[7] << 8) + cdb[8]; | |
198 | } | |
199 | ||
200 | static inline u32 transport_get_sectors_12(unsigned char *cdb) | |
201 | { | |
202 | return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9]; | |
203 | } | |
204 | ||
205 | static inline u32 transport_get_sectors_16(unsigned char *cdb) | |
206 | { | |
207 | return (u32)(cdb[10] << 24) + (cdb[11] << 16) + | |
208 | (cdb[12] << 8) + cdb[13]; | |
209 | } | |
210 | ||
211 | /* | |
212 | * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants | |
213 | */ | |
214 | static inline u32 transport_get_sectors_32(unsigned char *cdb) | |
215 | { | |
216 | return (u32)(cdb[28] << 24) + (cdb[29] << 16) + | |
217 | (cdb[30] << 8) + cdb[31]; | |
218 | ||
219 | } | |
220 | ||
221 | static inline u32 transport_lba_21(unsigned char *cdb) | |
222 | { | |
223 | return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3]; | |
224 | } | |
225 | ||
226 | static inline u32 transport_lba_32(unsigned char *cdb) | |
227 | { | |
228 | return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5]; | |
229 | } | |
230 | ||
231 | static inline unsigned long long transport_lba_64(unsigned char *cdb) | |
232 | { | |
233 | unsigned int __v1, __v2; | |
234 | ||
235 | __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5]; | |
236 | __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9]; | |
237 | ||
238 | return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; | |
239 | } | |
240 | ||
241 | /* | |
242 | * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs | |
243 | */ | |
244 | static inline unsigned long long transport_lba_64_ext(unsigned char *cdb) | |
245 | { | |
246 | unsigned int __v1, __v2; | |
247 | ||
248 | __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15]; | |
249 | __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19]; | |
250 | ||
251 | return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; | |
252 | } | |
253 | ||
cd063bef NB |
254 | static sense_reason_t |
255 | sbc_setup_write_same(struct se_cmd *cmd, unsigned char *flags, struct sbc_ops *ops) | |
d6e0175c | 256 | { |
8e575c50 NB |
257 | struct se_device *dev = cmd->se_dev; |
258 | sector_t end_lba = dev->transport->get_blocks(dev) + 1; | |
972b29c8 | 259 | unsigned int sectors = sbc_get_write_same_sectors(cmd); |
afd73f1b | 260 | sense_reason_t ret; |
773cbaf7 | 261 | |
d6e0175c CH |
262 | if ((flags[0] & 0x04) || (flags[0] & 0x02)) { |
263 | pr_err("WRITE_SAME PBDATA and LBDATA" | |
264 | " bits not supported for Block Discard" | |
265 | " Emulation\n"); | |
cd063bef | 266 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
d6e0175c | 267 | } |
773cbaf7 NB |
268 | if (sectors > cmd->se_dev->dev_attrib.max_write_same_len) { |
269 | pr_warn("WRITE_SAME sectors: %u exceeds max_write_same_len: %u\n", | |
270 | sectors, cmd->se_dev->dev_attrib.max_write_same_len); | |
271 | return TCM_INVALID_CDB_FIELD; | |
272 | } | |
8e575c50 NB |
273 | /* |
274 | * Sanity check for LBA wrap and request past end of device. | |
275 | */ | |
276 | if (((cmd->t_task_lba + sectors) < cmd->t_task_lba) || | |
277 | ((cmd->t_task_lba + sectors) > end_lba)) { | |
278 | pr_err("WRITE_SAME exceeds last lba %llu (lba %llu, sectors %u)\n", | |
279 | (unsigned long long)end_lba, cmd->t_task_lba, sectors); | |
280 | return TCM_ADDRESS_OUT_OF_RANGE; | |
281 | } | |
282 | ||
5cb770bf RD |
283 | /* We always have ANC_SUP == 0 so setting ANCHOR is always an error */ |
284 | if (flags[0] & 0x10) { | |
285 | pr_warn("WRITE SAME with ANCHOR not supported\n"); | |
286 | return TCM_INVALID_CDB_FIELD; | |
287 | } | |
d6e0175c | 288 | /* |
cd063bef NB |
289 | * Special case for WRITE_SAME w/ UNMAP=1 that ends up getting |
290 | * translated into block discard requests within backend code. | |
d6e0175c | 291 | */ |
cd063bef NB |
292 | if (flags[0] & 0x08) { |
293 | if (!ops->execute_write_same_unmap) | |
294 | return TCM_UNSUPPORTED_SCSI_OPCODE; | |
295 | ||
d0a91295 NB |
296 | if (!dev->dev_attrib.emulate_tpws) { |
297 | pr_err("Got WRITE_SAME w/ UNMAP=1, but backend device" | |
298 | " has emulate_tpws disabled\n"); | |
299 | return TCM_UNSUPPORTED_SCSI_OPCODE; | |
300 | } | |
cd063bef NB |
301 | cmd->execute_cmd = ops->execute_write_same_unmap; |
302 | return 0; | |
d6e0175c | 303 | } |
cd063bef NB |
304 | if (!ops->execute_write_same) |
305 | return TCM_UNSUPPORTED_SCSI_OPCODE; | |
d6e0175c | 306 | |
afd73f1b NB |
307 | ret = sbc_check_prot(dev, cmd, &cmd->t_task_cdb[0], sectors, true); |
308 | if (ret) | |
309 | return ret; | |
310 | ||
cd063bef | 311 | cmd->execute_cmd = ops->execute_write_same; |
d6e0175c CH |
312 | return 0; |
313 | } | |
314 | ||
a6b0133c | 315 | static sense_reason_t xdreadwrite_callback(struct se_cmd *cmd) |
d6e0175c CH |
316 | { |
317 | unsigned char *buf, *addr; | |
318 | struct scatterlist *sg; | |
319 | unsigned int offset; | |
a6b0133c NB |
320 | sense_reason_t ret = TCM_NO_SENSE; |
321 | int i, count; | |
d6e0175c CH |
322 | /* |
323 | * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command | |
324 | * | |
325 | * 1) read the specified logical block(s); | |
326 | * 2) transfer logical blocks from the data-out buffer; | |
327 | * 3) XOR the logical blocks transferred from the data-out buffer with | |
328 | * the logical blocks read, storing the resulting XOR data in a buffer; | |
329 | * 4) if the DISABLE WRITE bit is set to zero, then write the logical | |
330 | * blocks transferred from the data-out buffer; and | |
331 | * 5) transfer the resulting XOR data to the data-in buffer. | |
332 | */ | |
333 | buf = kmalloc(cmd->data_length, GFP_KERNEL); | |
334 | if (!buf) { | |
335 | pr_err("Unable to allocate xor_callback buf\n"); | |
a6b0133c | 336 | return TCM_OUT_OF_RESOURCES; |
d6e0175c CH |
337 | } |
338 | /* | |
339 | * Copy the scatterlist WRITE buffer located at cmd->t_data_sg | |
340 | * into the locally allocated *buf | |
341 | */ | |
342 | sg_copy_to_buffer(cmd->t_data_sg, | |
343 | cmd->t_data_nents, | |
344 | buf, | |
345 | cmd->data_length); | |
346 | ||
347 | /* | |
348 | * Now perform the XOR against the BIDI read memory located at | |
349 | * cmd->t_mem_bidi_list | |
350 | */ | |
351 | ||
352 | offset = 0; | |
353 | for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) { | |
354 | addr = kmap_atomic(sg_page(sg)); | |
a6b0133c NB |
355 | if (!addr) { |
356 | ret = TCM_OUT_OF_RESOURCES; | |
d6e0175c | 357 | goto out; |
a6b0133c | 358 | } |
d6e0175c CH |
359 | |
360 | for (i = 0; i < sg->length; i++) | |
361 | *(addr + sg->offset + i) ^= *(buf + offset + i); | |
362 | ||
363 | offset += sg->length; | |
364 | kunmap_atomic(addr); | |
365 | } | |
366 | ||
367 | out: | |
368 | kfree(buf); | |
a6b0133c | 369 | return ret; |
d6e0175c CH |
370 | } |
371 | ||
a82a9538 NB |
372 | static sense_reason_t |
373 | sbc_execute_rw(struct se_cmd *cmd) | |
374 | { | |
375 | return cmd->execute_rw(cmd, cmd->t_data_sg, cmd->t_data_nents, | |
376 | cmd->data_direction); | |
377 | } | |
378 | ||
68ff9b9b NB |
379 | static sense_reason_t compare_and_write_post(struct se_cmd *cmd) |
380 | { | |
381 | struct se_device *dev = cmd->se_dev; | |
382 | ||
d8855c15 NB |
383 | /* |
384 | * Only set SCF_COMPARE_AND_WRITE_POST to force a response fall-through | |
385 | * within target_complete_ok_work() if the command was successfully | |
386 | * sent to the backend driver. | |
387 | */ | |
388 | spin_lock_irq(&cmd->t_state_lock); | |
389 | if ((cmd->transport_state & CMD_T_SENT) && !cmd->scsi_status) | |
390 | cmd->se_cmd_flags |= SCF_COMPARE_AND_WRITE_POST; | |
391 | spin_unlock_irq(&cmd->t_state_lock); | |
392 | ||
68ff9b9b NB |
393 | /* |
394 | * Unlock ->caw_sem originally obtained during sbc_compare_and_write() | |
395 | * before the original READ I/O submission. | |
396 | */ | |
397 | up(&dev->caw_sem); | |
398 | ||
399 | return TCM_NO_SENSE; | |
400 | } | |
401 | ||
402 | static sense_reason_t compare_and_write_callback(struct se_cmd *cmd) | |
403 | { | |
404 | struct se_device *dev = cmd->se_dev; | |
405 | struct scatterlist *write_sg = NULL, *sg; | |
db60df88 | 406 | unsigned char *buf = NULL, *addr; |
68ff9b9b NB |
407 | struct sg_mapping_iter m; |
408 | unsigned int offset = 0, len; | |
409 | unsigned int nlbas = cmd->t_task_nolb; | |
410 | unsigned int block_size = dev->dev_attrib.block_size; | |
411 | unsigned int compare_len = (nlbas * block_size); | |
412 | sense_reason_t ret = TCM_NO_SENSE; | |
413 | int rc, i; | |
414 | ||
cf6d1f09 NB |
415 | /* |
416 | * Handle early failure in transport_generic_request_failure(), | |
417 | * which will not have taken ->caw_mutex yet.. | |
418 | */ | |
419 | if (!cmd->t_data_sg || !cmd->t_bidi_data_sg) | |
420 | return TCM_NO_SENSE; | |
db60df88 NB |
421 | /* |
422 | * Immediately exit + release dev->caw_sem if command has already | |
423 | * been failed with a non-zero SCSI status. | |
424 | */ | |
425 | if (cmd->scsi_status) { | |
426 | pr_err("compare_and_write_callback: non zero scsi_status:" | |
427 | " 0x%02x\n", cmd->scsi_status); | |
428 | goto out; | |
429 | } | |
cf6d1f09 | 430 | |
68ff9b9b NB |
431 | buf = kzalloc(cmd->data_length, GFP_KERNEL); |
432 | if (!buf) { | |
433 | pr_err("Unable to allocate compare_and_write buf\n"); | |
a2890087 NB |
434 | ret = TCM_OUT_OF_RESOURCES; |
435 | goto out; | |
68ff9b9b NB |
436 | } |
437 | ||
a1e1774c | 438 | write_sg = kmalloc(sizeof(struct scatterlist) * cmd->t_data_nents, |
68ff9b9b NB |
439 | GFP_KERNEL); |
440 | if (!write_sg) { | |
441 | pr_err("Unable to allocate compare_and_write sg\n"); | |
442 | ret = TCM_OUT_OF_RESOURCES; | |
443 | goto out; | |
444 | } | |
a1e1774c | 445 | sg_init_table(write_sg, cmd->t_data_nents); |
68ff9b9b NB |
446 | /* |
447 | * Setup verify and write data payloads from total NumberLBAs. | |
448 | */ | |
449 | rc = sg_copy_to_buffer(cmd->t_data_sg, cmd->t_data_nents, buf, | |
450 | cmd->data_length); | |
451 | if (!rc) { | |
452 | pr_err("sg_copy_to_buffer() failed for compare_and_write\n"); | |
453 | ret = TCM_OUT_OF_RESOURCES; | |
454 | goto out; | |
455 | } | |
456 | /* | |
457 | * Compare against SCSI READ payload against verify payload | |
458 | */ | |
459 | for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, i) { | |
460 | addr = (unsigned char *)kmap_atomic(sg_page(sg)); | |
461 | if (!addr) { | |
462 | ret = TCM_OUT_OF_RESOURCES; | |
463 | goto out; | |
464 | } | |
465 | ||
466 | len = min(sg->length, compare_len); | |
467 | ||
468 | if (memcmp(addr, buf + offset, len)) { | |
469 | pr_warn("Detected MISCOMPARE for addr: %p buf: %p\n", | |
470 | addr, buf + offset); | |
471 | kunmap_atomic(addr); | |
472 | goto miscompare; | |
473 | } | |
474 | kunmap_atomic(addr); | |
475 | ||
476 | offset += len; | |
477 | compare_len -= len; | |
478 | if (!compare_len) | |
479 | break; | |
480 | } | |
481 | ||
482 | i = 0; | |
483 | len = cmd->t_task_nolb * block_size; | |
484 | sg_miter_start(&m, cmd->t_data_sg, cmd->t_data_nents, SG_MITER_TO_SG); | |
485 | /* | |
486 | * Currently assumes NoLB=1 and SGLs are PAGE_SIZE.. | |
487 | */ | |
488 | while (len) { | |
489 | sg_miter_next(&m); | |
490 | ||
491 | if (block_size < PAGE_SIZE) { | |
492 | sg_set_page(&write_sg[i], m.page, block_size, | |
493 | block_size); | |
494 | } else { | |
495 | sg_miter_next(&m); | |
496 | sg_set_page(&write_sg[i], m.page, block_size, | |
497 | 0); | |
498 | } | |
499 | len -= block_size; | |
500 | i++; | |
501 | } | |
502 | sg_miter_stop(&m); | |
503 | /* | |
504 | * Save the original SGL + nents values before updating to new | |
505 | * assignments, to be released in transport_free_pages() -> | |
506 | * transport_reset_sgl_orig() | |
507 | */ | |
508 | cmd->t_data_sg_orig = cmd->t_data_sg; | |
509 | cmd->t_data_sg = write_sg; | |
510 | cmd->t_data_nents_orig = cmd->t_data_nents; | |
511 | cmd->t_data_nents = 1; | |
512 | ||
68d81f40 | 513 | cmd->sam_task_attr = TCM_HEAD_TAG; |
68ff9b9b NB |
514 | cmd->transport_complete_callback = compare_and_write_post; |
515 | /* | |
516 | * Now reset ->execute_cmd() to the normal sbc_execute_rw() handler | |
517 | * for submitting the adjusted SGL to write instance user-data. | |
518 | */ | |
519 | cmd->execute_cmd = sbc_execute_rw; | |
520 | ||
521 | spin_lock_irq(&cmd->t_state_lock); | |
522 | cmd->t_state = TRANSPORT_PROCESSING; | |
523 | cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT; | |
524 | spin_unlock_irq(&cmd->t_state_lock); | |
525 | ||
526 | __target_execute_cmd(cmd); | |
527 | ||
528 | kfree(buf); | |
529 | return ret; | |
530 | ||
531 | miscompare: | |
532 | pr_warn("Target/%s: Send MISCOMPARE check condition and sense\n", | |
533 | dev->transport->name); | |
534 | ret = TCM_MISCOMPARE_VERIFY; | |
535 | out: | |
536 | /* | |
537 | * In the MISCOMPARE or failure case, unlock ->caw_sem obtained in | |
538 | * sbc_compare_and_write() before the original READ I/O submission. | |
539 | */ | |
540 | up(&dev->caw_sem); | |
541 | kfree(write_sg); | |
542 | kfree(buf); | |
543 | return ret; | |
544 | } | |
545 | ||
546 | static sense_reason_t | |
547 | sbc_compare_and_write(struct se_cmd *cmd) | |
548 | { | |
549 | struct se_device *dev = cmd->se_dev; | |
550 | sense_reason_t ret; | |
551 | int rc; | |
552 | /* | |
553 | * Submit the READ first for COMPARE_AND_WRITE to perform the | |
554 | * comparision using SGLs at cmd->t_bidi_data_sg.. | |
555 | */ | |
556 | rc = down_interruptible(&dev->caw_sem); | |
557 | if ((rc != 0) || signal_pending(current)) { | |
558 | cmd->transport_complete_callback = NULL; | |
559 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
560 | } | |
b7191253 NB |
561 | /* |
562 | * Reset cmd->data_length to individual block_size in order to not | |
563 | * confuse backend drivers that depend on this value matching the | |
564 | * size of the I/O being submitted. | |
565 | */ | |
566 | cmd->data_length = cmd->t_task_nolb * dev->dev_attrib.block_size; | |
68ff9b9b NB |
567 | |
568 | ret = cmd->execute_rw(cmd, cmd->t_bidi_data_sg, cmd->t_bidi_data_nents, | |
569 | DMA_FROM_DEVICE); | |
570 | if (ret) { | |
571 | cmd->transport_complete_callback = NULL; | |
572 | up(&dev->caw_sem); | |
573 | return ret; | |
574 | } | |
575 | /* | |
576 | * Unlock of dev->caw_sem to occur in compare_and_write_callback() | |
577 | * upon MISCOMPARE, or in compare_and_write_done() upon completion | |
578 | * of WRITE instance user-data. | |
579 | */ | |
580 | return TCM_NO_SENSE; | |
581 | } | |
582 | ||
19f9361a SG |
583 | static int |
584 | sbc_set_prot_op_checks(u8 protect, enum target_prot_type prot_type, | |
585 | bool is_write, struct se_cmd *cmd) | |
586 | { | |
587 | if (is_write) { | |
588 | cmd->prot_op = protect ? TARGET_PROT_DOUT_PASS : | |
589 | TARGET_PROT_DOUT_INSERT; | |
590 | switch (protect) { | |
591 | case 0x0: | |
592 | case 0x3: | |
593 | cmd->prot_checks = 0; | |
594 | break; | |
595 | case 0x1: | |
596 | case 0x5: | |
597 | cmd->prot_checks = TARGET_DIF_CHECK_GUARD; | |
598 | if (prot_type == TARGET_DIF_TYPE1_PROT) | |
599 | cmd->prot_checks |= TARGET_DIF_CHECK_REFTAG; | |
600 | break; | |
601 | case 0x2: | |
602 | if (prot_type == TARGET_DIF_TYPE1_PROT) | |
603 | cmd->prot_checks = TARGET_DIF_CHECK_REFTAG; | |
604 | break; | |
605 | case 0x4: | |
606 | cmd->prot_checks = TARGET_DIF_CHECK_GUARD; | |
607 | break; | |
608 | default: | |
609 | pr_err("Unsupported protect field %d\n", protect); | |
610 | return -EINVAL; | |
611 | } | |
612 | } else { | |
613 | cmd->prot_op = protect ? TARGET_PROT_DIN_PASS : | |
614 | TARGET_PROT_DIN_STRIP; | |
615 | switch (protect) { | |
616 | case 0x0: | |
617 | case 0x1: | |
618 | case 0x5: | |
619 | cmd->prot_checks = TARGET_DIF_CHECK_GUARD; | |
620 | if (prot_type == TARGET_DIF_TYPE1_PROT) | |
621 | cmd->prot_checks |= TARGET_DIF_CHECK_REFTAG; | |
622 | break; | |
623 | case 0x2: | |
624 | if (prot_type == TARGET_DIF_TYPE1_PROT) | |
625 | cmd->prot_checks = TARGET_DIF_CHECK_REFTAG; | |
626 | break; | |
627 | case 0x3: | |
628 | cmd->prot_checks = 0; | |
629 | break; | |
630 | case 0x4: | |
631 | cmd->prot_checks = TARGET_DIF_CHECK_GUARD; | |
632 | break; | |
633 | default: | |
634 | pr_err("Unsupported protect field %d\n", protect); | |
635 | return -EINVAL; | |
636 | } | |
637 | } | |
638 | ||
639 | return 0; | |
640 | } | |
641 | ||
f7b7c06f | 642 | static sense_reason_t |
499bf77b | 643 | sbc_check_prot(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb, |
19f9361a | 644 | u32 sectors, bool is_write) |
499bf77b | 645 | { |
19f9361a SG |
646 | u8 protect = cdb[1] >> 5; |
647 | ||
f7b7c06f NB |
648 | if (!cmd->t_prot_sg || !cmd->t_prot_nents) { |
649 | if (protect && !dev->dev_attrib.pi_prot_type) { | |
650 | pr_err("CDB contains protect bit, but device does not" | |
651 | " advertise PROTECT=1 feature bit\n"); | |
652 | return TCM_INVALID_CDB_FIELD; | |
653 | } | |
654 | if (cmd->prot_pto) | |
655 | return TCM_NO_SENSE; | |
656 | } | |
499bf77b NB |
657 | |
658 | switch (dev->dev_attrib.pi_prot_type) { | |
659 | case TARGET_DIF_TYPE3_PROT: | |
499bf77b NB |
660 | cmd->reftag_seed = 0xffffffff; |
661 | break; | |
662 | case TARGET_DIF_TYPE2_PROT: | |
19f9361a | 663 | if (protect) |
f7b7c06f | 664 | return TCM_INVALID_CDB_FIELD; |
499bf77b NB |
665 | |
666 | cmd->reftag_seed = cmd->t_task_lba; | |
667 | break; | |
668 | case TARGET_DIF_TYPE1_PROT: | |
499bf77b NB |
669 | cmd->reftag_seed = cmd->t_task_lba; |
670 | break; | |
671 | case TARGET_DIF_TYPE0_PROT: | |
672 | default: | |
f7b7c06f | 673 | return TCM_NO_SENSE; |
499bf77b NB |
674 | } |
675 | ||
19f9361a SG |
676 | if (sbc_set_prot_op_checks(protect, dev->dev_attrib.pi_prot_type, |
677 | is_write, cmd)) | |
f7b7c06f | 678 | return TCM_INVALID_CDB_FIELD; |
19f9361a | 679 | |
499bf77b NB |
680 | cmd->prot_type = dev->dev_attrib.pi_prot_type; |
681 | cmd->prot_length = dev->prot_length * sectors; | |
e2a4f55c SG |
682 | |
683 | /** | |
684 | * In case protection information exists over the wire | |
685 | * we modify command data length to describe pure data. | |
686 | * The actual transfer length is data length + protection | |
687 | * length | |
688 | **/ | |
689 | if (protect) | |
690 | cmd->data_length = sectors * dev->dev_attrib.block_size; | |
691 | ||
692 | pr_debug("%s: prot_type=%d, data_length=%d, prot_length=%d " | |
693 | "prot_op=%d prot_checks=%d\n", | |
694 | __func__, cmd->prot_type, cmd->data_length, cmd->prot_length, | |
03abad9e | 695 | cmd->prot_op, cmd->prot_checks); |
499bf77b | 696 | |
f7b7c06f | 697 | return TCM_NO_SENSE; |
499bf77b NB |
698 | } |
699 | ||
fde9f50f NB |
700 | static int |
701 | sbc_check_dpofua(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb) | |
702 | { | |
703 | if (cdb[1] & 0x10) { | |
704 | if (!dev->dev_attrib.emulate_dpo) { | |
705 | pr_err("Got CDB: 0x%02x with DPO bit set, but device" | |
706 | " does not advertise support for DPO\n", cdb[0]); | |
707 | return -EINVAL; | |
708 | } | |
709 | } | |
710 | if (cdb[1] & 0x8) { | |
711 | if (!dev->dev_attrib.emulate_fua_write || | |
712 | !dev->dev_attrib.emulate_write_cache) { | |
713 | pr_err("Got CDB: 0x%02x with FUA bit set, but device" | |
714 | " does not advertise support for FUA write\n", | |
715 | cdb[0]); | |
716 | return -EINVAL; | |
717 | } | |
718 | cmd->se_cmd_flags |= SCF_FUA; | |
719 | } | |
720 | return 0; | |
721 | } | |
722 | ||
de103c93 CH |
723 | sense_reason_t |
724 | sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops) | |
d6e0175c | 725 | { |
d6e0175c CH |
726 | struct se_device *dev = cmd->se_dev; |
727 | unsigned char *cdb = cmd->t_task_cdb; | |
1fd032ee | 728 | unsigned int size; |
d6e0175c | 729 | u32 sectors = 0; |
de103c93 | 730 | sense_reason_t ret; |
d6e0175c CH |
731 | |
732 | switch (cdb[0]) { | |
733 | case READ_6: | |
734 | sectors = transport_get_sectors_6(cdb); | |
735 | cmd->t_task_lba = transport_lba_21(cdb); | |
736 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
a82a9538 NB |
737 | cmd->execute_rw = ops->execute_rw; |
738 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c CH |
739 | break; |
740 | case READ_10: | |
741 | sectors = transport_get_sectors_10(cdb); | |
742 | cmd->t_task_lba = transport_lba_32(cdb); | |
499bf77b | 743 | |
fde9f50f NB |
744 | if (sbc_check_dpofua(dev, cmd, cdb)) |
745 | return TCM_INVALID_CDB_FIELD; | |
746 | ||
f7b7c06f NB |
747 | ret = sbc_check_prot(dev, cmd, cdb, sectors, false); |
748 | if (ret) | |
749 | return ret; | |
499bf77b | 750 | |
d6e0175c | 751 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
a82a9538 NB |
752 | cmd->execute_rw = ops->execute_rw; |
753 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c CH |
754 | break; |
755 | case READ_12: | |
756 | sectors = transport_get_sectors_12(cdb); | |
757 | cmd->t_task_lba = transport_lba_32(cdb); | |
499bf77b | 758 | |
fde9f50f NB |
759 | if (sbc_check_dpofua(dev, cmd, cdb)) |
760 | return TCM_INVALID_CDB_FIELD; | |
761 | ||
f7b7c06f NB |
762 | ret = sbc_check_prot(dev, cmd, cdb, sectors, false); |
763 | if (ret) | |
764 | return ret; | |
499bf77b | 765 | |
d6e0175c | 766 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
a82a9538 NB |
767 | cmd->execute_rw = ops->execute_rw; |
768 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c CH |
769 | break; |
770 | case READ_16: | |
771 | sectors = transport_get_sectors_16(cdb); | |
772 | cmd->t_task_lba = transport_lba_64(cdb); | |
499bf77b | 773 | |
fde9f50f NB |
774 | if (sbc_check_dpofua(dev, cmd, cdb)) |
775 | return TCM_INVALID_CDB_FIELD; | |
776 | ||
f7b7c06f NB |
777 | ret = sbc_check_prot(dev, cmd, cdb, sectors, false); |
778 | if (ret) | |
779 | return ret; | |
499bf77b | 780 | |
d6e0175c | 781 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
a82a9538 NB |
782 | cmd->execute_rw = ops->execute_rw; |
783 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c CH |
784 | break; |
785 | case WRITE_6: | |
786 | sectors = transport_get_sectors_6(cdb); | |
787 | cmd->t_task_lba = transport_lba_21(cdb); | |
788 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
a82a9538 NB |
789 | cmd->execute_rw = ops->execute_rw; |
790 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c CH |
791 | break; |
792 | case WRITE_10: | |
793 | case WRITE_VERIFY: | |
794 | sectors = transport_get_sectors_10(cdb); | |
795 | cmd->t_task_lba = transport_lba_32(cdb); | |
499bf77b | 796 | |
fde9f50f NB |
797 | if (sbc_check_dpofua(dev, cmd, cdb)) |
798 | return TCM_INVALID_CDB_FIELD; | |
799 | ||
f7b7c06f NB |
800 | ret = sbc_check_prot(dev, cmd, cdb, sectors, true); |
801 | if (ret) | |
802 | return ret; | |
499bf77b | 803 | |
d6e0175c | 804 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
a82a9538 NB |
805 | cmd->execute_rw = ops->execute_rw; |
806 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c CH |
807 | break; |
808 | case WRITE_12: | |
809 | sectors = transport_get_sectors_12(cdb); | |
810 | cmd->t_task_lba = transport_lba_32(cdb); | |
499bf77b | 811 | |
fde9f50f NB |
812 | if (sbc_check_dpofua(dev, cmd, cdb)) |
813 | return TCM_INVALID_CDB_FIELD; | |
814 | ||
f7b7c06f NB |
815 | ret = sbc_check_prot(dev, cmd, cdb, sectors, true); |
816 | if (ret) | |
817 | return ret; | |
499bf77b | 818 | |
d6e0175c | 819 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
a82a9538 NB |
820 | cmd->execute_rw = ops->execute_rw; |
821 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c CH |
822 | break; |
823 | case WRITE_16: | |
824 | sectors = transport_get_sectors_16(cdb); | |
825 | cmd->t_task_lba = transport_lba_64(cdb); | |
499bf77b | 826 | |
fde9f50f NB |
827 | if (sbc_check_dpofua(dev, cmd, cdb)) |
828 | return TCM_INVALID_CDB_FIELD; | |
829 | ||
f7b7c06f NB |
830 | ret = sbc_check_prot(dev, cmd, cdb, sectors, true); |
831 | if (ret) | |
832 | return ret; | |
499bf77b | 833 | |
d6e0175c | 834 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
a82a9538 NB |
835 | cmd->execute_rw = ops->execute_rw; |
836 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c CH |
837 | break; |
838 | case XDWRITEREAD_10: | |
de103c93 | 839 | if (cmd->data_direction != DMA_TO_DEVICE || |
d6e0175c | 840 | !(cmd->se_cmd_flags & SCF_BIDI)) |
de103c93 | 841 | return TCM_INVALID_CDB_FIELD; |
d6e0175c CH |
842 | sectors = transport_get_sectors_10(cdb); |
843 | ||
fde9f50f NB |
844 | if (sbc_check_dpofua(dev, cmd, cdb)) |
845 | return TCM_INVALID_CDB_FIELD; | |
846 | ||
d6e0175c CH |
847 | cmd->t_task_lba = transport_lba_32(cdb); |
848 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
849 | ||
850 | /* | |
851 | * Setup BIDI XOR callback to be run after I/O completion. | |
852 | */ | |
a82a9538 NB |
853 | cmd->execute_rw = ops->execute_rw; |
854 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c | 855 | cmd->transport_complete_callback = &xdreadwrite_callback; |
d6e0175c CH |
856 | break; |
857 | case VARIABLE_LENGTH_CMD: | |
858 | { | |
859 | u16 service_action = get_unaligned_be16(&cdb[8]); | |
860 | switch (service_action) { | |
861 | case XDWRITEREAD_32: | |
862 | sectors = transport_get_sectors_32(cdb); | |
863 | ||
fde9f50f NB |
864 | if (sbc_check_dpofua(dev, cmd, cdb)) |
865 | return TCM_INVALID_CDB_FIELD; | |
d6e0175c CH |
866 | /* |
867 | * Use WRITE_32 and READ_32 opcodes for the emulated | |
868 | * XDWRITE_READ_32 logic. | |
869 | */ | |
870 | cmd->t_task_lba = transport_lba_64_ext(cdb); | |
871 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
872 | ||
873 | /* | |
874 | * Setup BIDI XOR callback to be run during after I/O | |
875 | * completion. | |
876 | */ | |
a82a9538 NB |
877 | cmd->execute_rw = ops->execute_rw; |
878 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c | 879 | cmd->transport_complete_callback = &xdreadwrite_callback; |
d6e0175c CH |
880 | break; |
881 | case WRITE_SAME_32: | |
882 | sectors = transport_get_sectors_32(cdb); | |
883 | if (!sectors) { | |
884 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not" | |
885 | " supported\n"); | |
de103c93 | 886 | return TCM_INVALID_CDB_FIELD; |
d6e0175c CH |
887 | } |
888 | ||
1fd032ee | 889 | size = sbc_get_size(cmd, 1); |
d6e0175c CH |
890 | cmd->t_task_lba = get_unaligned_be64(&cdb[12]); |
891 | ||
cd063bef | 892 | ret = sbc_setup_write_same(cmd, &cdb[10], ops); |
6b64e1fe | 893 | if (ret) |
cd063bef | 894 | return ret; |
d6e0175c CH |
895 | break; |
896 | default: | |
897 | pr_err("VARIABLE_LENGTH_CMD service action" | |
898 | " 0x%04x not supported\n", service_action); | |
de103c93 | 899 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
d6e0175c CH |
900 | } |
901 | break; | |
902 | } | |
68ff9b9b NB |
903 | case COMPARE_AND_WRITE: |
904 | sectors = cdb[13]; | |
905 | /* | |
906 | * Currently enforce COMPARE_AND_WRITE for a single sector | |
907 | */ | |
908 | if (sectors > 1) { | |
909 | pr_err("COMPARE_AND_WRITE contains NoLB: %u greater" | |
910 | " than 1\n", sectors); | |
911 | return TCM_INVALID_CDB_FIELD; | |
912 | } | |
913 | /* | |
914 | * Double size because we have two buffers, note that | |
915 | * zero is not an error.. | |
916 | */ | |
917 | size = 2 * sbc_get_size(cmd, sectors); | |
918 | cmd->t_task_lba = get_unaligned_be64(&cdb[2]); | |
919 | cmd->t_task_nolb = sectors; | |
920 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB | SCF_COMPARE_AND_WRITE; | |
921 | cmd->execute_rw = ops->execute_rw; | |
922 | cmd->execute_cmd = sbc_compare_and_write; | |
923 | cmd->transport_complete_callback = compare_and_write_callback; | |
924 | break; | |
d6e0175c | 925 | case READ_CAPACITY: |
1fd032ee CH |
926 | size = READ_CAP_LEN; |
927 | cmd->execute_cmd = sbc_emulate_readcapacity; | |
d6e0175c | 928 | break; |
eb846d9f | 929 | case SERVICE_ACTION_IN_16: |
d6e0175c CH |
930 | switch (cmd->t_task_cdb[1] & 0x1f) { |
931 | case SAI_READ_CAPACITY_16: | |
1fd032ee | 932 | cmd->execute_cmd = sbc_emulate_readcapacity_16; |
d6e0175c | 933 | break; |
c66094bf HR |
934 | case SAI_REPORT_REFERRALS: |
935 | cmd->execute_cmd = target_emulate_report_referrals; | |
936 | break; | |
d6e0175c CH |
937 | default: |
938 | pr_err("Unsupported SA: 0x%02x\n", | |
939 | cmd->t_task_cdb[1] & 0x1f); | |
de103c93 | 940 | return TCM_INVALID_CDB_FIELD; |
d6e0175c | 941 | } |
1fd032ee | 942 | size = (cdb[10] << 24) | (cdb[11] << 16) | |
d6e0175c CH |
943 | (cdb[12] << 8) | cdb[13]; |
944 | break; | |
945 | case SYNCHRONIZE_CACHE: | |
946 | case SYNCHRONIZE_CACHE_16: | |
d6e0175c CH |
947 | if (cdb[0] == SYNCHRONIZE_CACHE) { |
948 | sectors = transport_get_sectors_10(cdb); | |
949 | cmd->t_task_lba = transport_lba_32(cdb); | |
950 | } else { | |
951 | sectors = transport_get_sectors_16(cdb); | |
952 | cmd->t_task_lba = transport_lba_64(cdb); | |
953 | } | |
6ef31dc7 CVB |
954 | if (ops->execute_sync_cache) { |
955 | cmd->execute_cmd = ops->execute_sync_cache; | |
956 | goto check_lba; | |
d6e0175c | 957 | } |
6ef31dc7 CVB |
958 | size = 0; |
959 | cmd->execute_cmd = sbc_emulate_noop; | |
d6e0175c CH |
960 | break; |
961 | case UNMAP: | |
14150a6b | 962 | if (!ops->execute_unmap) |
de103c93 | 963 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
14150a6b | 964 | |
1fd032ee | 965 | size = get_unaligned_be16(&cdb[7]); |
14150a6b | 966 | cmd->execute_cmd = ops->execute_unmap; |
d6e0175c CH |
967 | break; |
968 | case WRITE_SAME_16: | |
969 | sectors = transport_get_sectors_16(cdb); | |
970 | if (!sectors) { | |
971 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); | |
de103c93 | 972 | return TCM_INVALID_CDB_FIELD; |
d6e0175c CH |
973 | } |
974 | ||
1fd032ee | 975 | size = sbc_get_size(cmd, 1); |
d6e0175c CH |
976 | cmd->t_task_lba = get_unaligned_be64(&cdb[2]); |
977 | ||
cd063bef | 978 | ret = sbc_setup_write_same(cmd, &cdb[1], ops); |
6b64e1fe | 979 | if (ret) |
cd063bef | 980 | return ret; |
d6e0175c CH |
981 | break; |
982 | case WRITE_SAME: | |
983 | sectors = transport_get_sectors_10(cdb); | |
984 | if (!sectors) { | |
985 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); | |
de103c93 | 986 | return TCM_INVALID_CDB_FIELD; |
d6e0175c CH |
987 | } |
988 | ||
1fd032ee | 989 | size = sbc_get_size(cmd, 1); |
d6e0175c CH |
990 | cmd->t_task_lba = get_unaligned_be32(&cdb[2]); |
991 | ||
992 | /* | |
993 | * Follow sbcr26 with WRITE_SAME (10) and check for the existence | |
994 | * of byte 1 bit 3 UNMAP instead of original reserved field | |
995 | */ | |
cd063bef | 996 | ret = sbc_setup_write_same(cmd, &cdb[1], ops); |
6b64e1fe | 997 | if (ret) |
cd063bef | 998 | return ret; |
d6e0175c CH |
999 | break; |
1000 | case VERIFY: | |
1fd032ee | 1001 | size = 0; |
c52716de CVB |
1002 | sectors = transport_get_sectors_10(cdb); |
1003 | cmd->t_task_lba = transport_lba_32(cdb); | |
1920ed61 | 1004 | cmd->execute_cmd = sbc_emulate_noop; |
c52716de | 1005 | goto check_lba; |
1a1ff38c BK |
1006 | case REZERO_UNIT: |
1007 | case SEEK_6: | |
1008 | case SEEK_10: | |
1009 | /* | |
1010 | * There are still clients out there which use these old SCSI-2 | |
1011 | * commands. This mainly happens when running VMs with legacy | |
1012 | * guest systems, connected via SCSI command pass-through to | |
1013 | * iSCSI targets. Make them happy and return status GOOD. | |
1014 | */ | |
1015 | size = 0; | |
1016 | cmd->execute_cmd = sbc_emulate_noop; | |
1017 | break; | |
d6e0175c | 1018 | default: |
1fd032ee | 1019 | ret = spc_parse_cdb(cmd, &size); |
d6e0175c CH |
1020 | if (ret) |
1021 | return ret; | |
1022 | } | |
1023 | ||
1024 | /* reject any command that we don't have a handler for */ | |
20959c4b | 1025 | if (!cmd->execute_cmd) |
de103c93 | 1026 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
d6e0175c CH |
1027 | |
1028 | if (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) { | |
1fd032ee CH |
1029 | unsigned long long end_lba; |
1030 | ||
0fd97ccf | 1031 | if (sectors > dev->dev_attrib.fabric_max_sectors) { |
d6e0175c CH |
1032 | printk_ratelimited(KERN_ERR "SCSI OP %02xh with too" |
1033 | " big sectors %u exceeds fabric_max_sectors:" | |
1034 | " %u\n", cdb[0], sectors, | |
0fd97ccf | 1035 | dev->dev_attrib.fabric_max_sectors); |
de103c93 | 1036 | return TCM_INVALID_CDB_FIELD; |
d6e0175c | 1037 | } |
0fd97ccf | 1038 | if (sectors > dev->dev_attrib.hw_max_sectors) { |
d6e0175c CH |
1039 | printk_ratelimited(KERN_ERR "SCSI OP %02xh with too" |
1040 | " big sectors %u exceeds backend hw_max_sectors:" | |
1041 | " %u\n", cdb[0], sectors, | |
0fd97ccf | 1042 | dev->dev_attrib.hw_max_sectors); |
de103c93 | 1043 | return TCM_INVALID_CDB_FIELD; |
d6e0175c | 1044 | } |
6ef31dc7 | 1045 | check_lba: |
1fd032ee | 1046 | end_lba = dev->transport->get_blocks(dev) + 1; |
aa179935 NB |
1047 | if (((cmd->t_task_lba + sectors) < cmd->t_task_lba) || |
1048 | ((cmd->t_task_lba + sectors) > end_lba)) { | |
1fd032ee CH |
1049 | pr_err("cmd exceeds last lba %llu " |
1050 | "(lba %llu, sectors %u)\n", | |
1051 | end_lba, cmd->t_task_lba, sectors); | |
09ceadc7 | 1052 | return TCM_ADDRESS_OUT_OF_RANGE; |
1fd032ee CH |
1053 | } |
1054 | ||
68ff9b9b NB |
1055 | if (!(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) |
1056 | size = sbc_get_size(cmd, sectors); | |
d6e0175c CH |
1057 | } |
1058 | ||
de103c93 | 1059 | return target_cmd_size_check(cmd, size); |
d6e0175c CH |
1060 | } |
1061 | EXPORT_SYMBOL(sbc_parse_cdb); | |
6f23ac8a | 1062 | |
6f23ac8a CH |
1063 | u32 sbc_get_device_type(struct se_device *dev) |
1064 | { | |
1065 | return TYPE_DISK; | |
1066 | } | |
1067 | EXPORT_SYMBOL(sbc_get_device_type); | |
86d71829 AH |
1068 | |
1069 | sense_reason_t | |
1070 | sbc_execute_unmap(struct se_cmd *cmd, | |
1071 | sense_reason_t (*do_unmap_fn)(struct se_cmd *, void *, | |
1072 | sector_t, sector_t), | |
1073 | void *priv) | |
1074 | { | |
1075 | struct se_device *dev = cmd->se_dev; | |
1076 | unsigned char *buf, *ptr = NULL; | |
1077 | sector_t lba; | |
1078 | int size; | |
1079 | u32 range; | |
1080 | sense_reason_t ret = 0; | |
1081 | int dl, bd_dl; | |
1082 | ||
1083 | /* We never set ANC_SUP */ | |
1084 | if (cmd->t_task_cdb[1]) | |
1085 | return TCM_INVALID_CDB_FIELD; | |
1086 | ||
1087 | if (cmd->data_length == 0) { | |
1088 | target_complete_cmd(cmd, SAM_STAT_GOOD); | |
1089 | return 0; | |
1090 | } | |
1091 | ||
1092 | if (cmd->data_length < 8) { | |
1093 | pr_warn("UNMAP parameter list length %u too small\n", | |
1094 | cmd->data_length); | |
1095 | return TCM_PARAMETER_LIST_LENGTH_ERROR; | |
1096 | } | |
1097 | ||
1098 | buf = transport_kmap_data_sg(cmd); | |
1099 | if (!buf) | |
1100 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
1101 | ||
1102 | dl = get_unaligned_be16(&buf[0]); | |
1103 | bd_dl = get_unaligned_be16(&buf[2]); | |
1104 | ||
1105 | size = cmd->data_length - 8; | |
1106 | if (bd_dl > size) | |
1107 | pr_warn("UNMAP parameter list length %u too small, ignoring bd_dl %u\n", | |
1108 | cmd->data_length, bd_dl); | |
1109 | else | |
1110 | size = bd_dl; | |
1111 | ||
1112 | if (size / 16 > dev->dev_attrib.max_unmap_block_desc_count) { | |
1113 | ret = TCM_INVALID_PARAMETER_LIST; | |
1114 | goto err; | |
1115 | } | |
1116 | ||
1117 | /* First UNMAP block descriptor starts at 8 byte offset */ | |
1118 | ptr = &buf[8]; | |
1119 | pr_debug("UNMAP: Sub: %s Using dl: %u bd_dl: %u size: %u" | |
1120 | " ptr: %p\n", dev->transport->name, dl, bd_dl, size, ptr); | |
1121 | ||
1122 | while (size >= 16) { | |
1123 | lba = get_unaligned_be64(&ptr[0]); | |
1124 | range = get_unaligned_be32(&ptr[8]); | |
1125 | pr_debug("UNMAP: Using lba: %llu and range: %u\n", | |
1126 | (unsigned long long)lba, range); | |
1127 | ||
1128 | if (range > dev->dev_attrib.max_unmap_lba_count) { | |
1129 | ret = TCM_INVALID_PARAMETER_LIST; | |
1130 | goto err; | |
1131 | } | |
1132 | ||
1133 | if (lba + range > dev->transport->get_blocks(dev) + 1) { | |
1134 | ret = TCM_ADDRESS_OUT_OF_RANGE; | |
1135 | goto err; | |
1136 | } | |
1137 | ||
1138 | ret = do_unmap_fn(cmd, priv, lba, range); | |
1139 | if (ret) | |
1140 | goto err; | |
1141 | ||
1142 | ptr += 16; | |
1143 | size -= 16; | |
1144 | } | |
1145 | ||
1146 | err: | |
1147 | transport_kunmap_data_sg(cmd); | |
1148 | if (!ret) | |
1149 | target_complete_cmd(cmd, GOOD); | |
1150 | return ret; | |
1151 | } | |
1152 | EXPORT_SYMBOL(sbc_execute_unmap); | |
41861fa8 | 1153 | |
66a3d5bc NB |
1154 | void |
1155 | sbc_dif_generate(struct se_cmd *cmd) | |
1156 | { | |
1157 | struct se_device *dev = cmd->se_dev; | |
1158 | struct se_dif_v1_tuple *sdt; | |
1159 | struct scatterlist *dsg, *psg = cmd->t_prot_sg; | |
1160 | sector_t sector = cmd->t_task_lba; | |
1161 | void *daddr, *paddr; | |
1162 | int i, j, offset = 0; | |
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(psg)) + psg->offset; | |
1167 | ||
1168 | for (j = 0; j < dsg->length; j += dev->dev_attrib.block_size) { | |
1169 | ||
1170 | if (offset >= psg->length) { | |
1171 | kunmap_atomic(paddr); | |
1172 | psg = sg_next(psg); | |
1173 | paddr = kmap_atomic(sg_page(psg)) + psg->offset; | |
1174 | offset = 0; | |
1175 | } | |
1176 | ||
1177 | sdt = paddr + offset; | |
1178 | sdt->guard_tag = cpu_to_be16(crc_t10dif(daddr + j, | |
1179 | dev->dev_attrib.block_size)); | |
1180 | if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE1_PROT) | |
1181 | sdt->ref_tag = cpu_to_be32(sector & 0xffffffff); | |
1182 | sdt->app_tag = 0; | |
1183 | ||
1184 | pr_debug("DIF WRITE INSERT sector: %llu guard_tag: 0x%04x" | |
1185 | " app_tag: 0x%04x ref_tag: %u\n", | |
1186 | (unsigned long long)sector, sdt->guard_tag, | |
1187 | sdt->app_tag, be32_to_cpu(sdt->ref_tag)); | |
1188 | ||
1189 | sector++; | |
1190 | offset += sizeof(struct se_dif_v1_tuple); | |
1191 | } | |
1192 | ||
1193 | kunmap_atomic(paddr); | |
1194 | kunmap_atomic(daddr); | |
1195 | } | |
1196 | } | |
1197 | ||
41861fa8 NB |
1198 | static sense_reason_t |
1199 | sbc_dif_v1_verify(struct se_device *dev, struct se_dif_v1_tuple *sdt, | |
1200 | const void *p, sector_t sector, unsigned int ei_lba) | |
1201 | { | |
1202 | int block_size = dev->dev_attrib.block_size; | |
1203 | __be16 csum; | |
1204 | ||
1205 | csum = cpu_to_be16(crc_t10dif(p, block_size)); | |
1206 | ||
1207 | if (sdt->guard_tag != csum) { | |
1208 | pr_err("DIFv1 checksum failed on sector %llu guard tag 0x%04x" | |
1209 | " csum 0x%04x\n", (unsigned long long)sector, | |
1210 | be16_to_cpu(sdt->guard_tag), be16_to_cpu(csum)); | |
1211 | return TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED; | |
1212 | } | |
1213 | ||
1214 | if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE1_PROT && | |
1215 | be32_to_cpu(sdt->ref_tag) != (sector & 0xffffffff)) { | |
1216 | pr_err("DIFv1 Type 1 reference failed on sector: %llu tag: 0x%08x" | |
1217 | " sector MSB: 0x%08x\n", (unsigned long long)sector, | |
1218 | be32_to_cpu(sdt->ref_tag), (u32)(sector & 0xffffffff)); | |
1219 | return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED; | |
1220 | } | |
1221 | ||
1222 | if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE2_PROT && | |
1223 | be32_to_cpu(sdt->ref_tag) != ei_lba) { | |
1224 | pr_err("DIFv1 Type 2 reference failed on sector: %llu tag: 0x%08x" | |
1225 | " ei_lba: 0x%08x\n", (unsigned long long)sector, | |
1226 | be32_to_cpu(sdt->ref_tag), ei_lba); | |
1227 | return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED; | |
1228 | } | |
1229 | ||
1230 | return 0; | |
1231 | } | |
1232 | ||
1233 | static void | |
1234 | sbc_dif_copy_prot(struct se_cmd *cmd, unsigned int sectors, bool read, | |
1235 | struct scatterlist *sg, int sg_off) | |
1236 | { | |
1237 | struct se_device *dev = cmd->se_dev; | |
1238 | struct scatterlist *psg; | |
1239 | void *paddr, *addr; | |
1240 | unsigned int i, len, left; | |
10762e80 | 1241 | unsigned int offset = sg_off; |
41861fa8 NB |
1242 | |
1243 | left = sectors * dev->prot_length; | |
1244 | ||
1245 | for_each_sg(cmd->t_prot_sg, psg, cmd->t_prot_nents, i) { | |
16c0ae02 | 1246 | unsigned int psg_len, copied = 0; |
d6a65fdc | 1247 | |
41861fa8 | 1248 | paddr = kmap_atomic(sg_page(psg)) + psg->offset; |
16c0ae02 SG |
1249 | psg_len = min(left, psg->length); |
1250 | while (psg_len) { | |
1251 | len = min(psg_len, sg->length - offset); | |
1252 | addr = kmap_atomic(sg_page(sg)) + sg->offset + offset; | |
1253 | ||
1254 | if (read) | |
1255 | memcpy(paddr + copied, addr, len); | |
1256 | else | |
1257 | memcpy(addr, paddr + copied, len); | |
1258 | ||
1259 | left -= len; | |
1260 | offset += len; | |
1261 | copied += len; | |
1262 | psg_len -= len; | |
1263 | ||
1264 | if (offset >= sg->length) { | |
1265 | sg = sg_next(sg); | |
1266 | offset = 0; | |
1267 | } | |
1268 | kunmap_atomic(addr); | |
1269 | } | |
41861fa8 | 1270 | kunmap_atomic(paddr); |
41861fa8 NB |
1271 | } |
1272 | } | |
1273 | ||
1274 | sense_reason_t | |
1275 | sbc_dif_verify_write(struct se_cmd *cmd, sector_t start, unsigned int sectors, | |
1276 | unsigned int ei_lba, struct scatterlist *sg, int sg_off) | |
1277 | { | |
1278 | struct se_device *dev = cmd->se_dev; | |
1279 | struct se_dif_v1_tuple *sdt; | |
1280 | struct scatterlist *dsg, *psg = cmd->t_prot_sg; | |
1281 | sector_t sector = start; | |
1282 | void *daddr, *paddr; | |
1283 | int i, j, offset = 0; | |
1284 | sense_reason_t rc; | |
1285 | ||
1286 | for_each_sg(cmd->t_data_sg, dsg, cmd->t_data_nents, i) { | |
1287 | daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; | |
1288 | paddr = kmap_atomic(sg_page(psg)) + psg->offset; | |
1289 | ||
1290 | for (j = 0; j < dsg->length; j += dev->dev_attrib.block_size) { | |
1291 | ||
1292 | if (offset >= psg->length) { | |
1293 | kunmap_atomic(paddr); | |
1294 | psg = sg_next(psg); | |
1295 | paddr = kmap_atomic(sg_page(psg)) + psg->offset; | |
1296 | offset = 0; | |
1297 | } | |
1298 | ||
1299 | sdt = paddr + offset; | |
1300 | ||
1301 | pr_debug("DIF WRITE sector: %llu guard_tag: 0x%04x" | |
1302 | " app_tag: 0x%04x ref_tag: %u\n", | |
1303 | (unsigned long long)sector, sdt->guard_tag, | |
1304 | sdt->app_tag, be32_to_cpu(sdt->ref_tag)); | |
1305 | ||
1306 | rc = sbc_dif_v1_verify(dev, sdt, daddr + j, sector, | |
1307 | ei_lba); | |
1308 | if (rc) { | |
1309 | kunmap_atomic(paddr); | |
1310 | kunmap_atomic(daddr); | |
76736db3 | 1311 | cmd->bad_sector = sector; |
41861fa8 NB |
1312 | return rc; |
1313 | } | |
1314 | ||
1315 | sector++; | |
1316 | ei_lba++; | |
1317 | offset += sizeof(struct se_dif_v1_tuple); | |
1318 | } | |
1319 | ||
1320 | kunmap_atomic(paddr); | |
1321 | kunmap_atomic(daddr); | |
1322 | } | |
1323 | sbc_dif_copy_prot(cmd, sectors, false, sg, sg_off); | |
1324 | ||
1325 | return 0; | |
1326 | } | |
1327 | EXPORT_SYMBOL(sbc_dif_verify_write); | |
1328 | ||
395ccb25 NB |
1329 | static sense_reason_t |
1330 | __sbc_dif_verify_read(struct se_cmd *cmd, sector_t start, unsigned int sectors, | |
1331 | unsigned int ei_lba, struct scatterlist *sg, int sg_off) | |
41861fa8 NB |
1332 | { |
1333 | struct se_device *dev = cmd->se_dev; | |
1334 | struct se_dif_v1_tuple *sdt; | |
fc272ec7 | 1335 | struct scatterlist *dsg, *psg = sg; |
41861fa8 NB |
1336 | sector_t sector = start; |
1337 | void *daddr, *paddr; | |
1338 | int i, j, offset = sg_off; | |
1339 | sense_reason_t rc; | |
1340 | ||
1341 | for_each_sg(cmd->t_data_sg, dsg, cmd->t_data_nents, i) { | |
1342 | daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; | |
fc272ec7 | 1343 | paddr = kmap_atomic(sg_page(psg)) + sg->offset; |
41861fa8 NB |
1344 | |
1345 | for (j = 0; j < dsg->length; j += dev->dev_attrib.block_size) { | |
1346 | ||
fc272ec7 | 1347 | if (offset >= psg->length) { |
41861fa8 | 1348 | kunmap_atomic(paddr); |
fc272ec7 SG |
1349 | psg = sg_next(psg); |
1350 | paddr = kmap_atomic(sg_page(psg)) + psg->offset; | |
41861fa8 NB |
1351 | offset = 0; |
1352 | } | |
1353 | ||
1354 | sdt = paddr + offset; | |
1355 | ||
1356 | pr_debug("DIF READ sector: %llu guard_tag: 0x%04x" | |
1357 | " app_tag: 0x%04x ref_tag: %u\n", | |
1358 | (unsigned long long)sector, sdt->guard_tag, | |
1359 | sdt->app_tag, be32_to_cpu(sdt->ref_tag)); | |
1360 | ||
1361 | if (sdt->app_tag == cpu_to_be16(0xffff)) { | |
1362 | sector++; | |
1363 | offset += sizeof(struct se_dif_v1_tuple); | |
1364 | continue; | |
1365 | } | |
1366 | ||
1367 | rc = sbc_dif_v1_verify(dev, sdt, daddr + j, sector, | |
1368 | ei_lba); | |
1369 | if (rc) { | |
1370 | kunmap_atomic(paddr); | |
1371 | kunmap_atomic(daddr); | |
76736db3 | 1372 | cmd->bad_sector = sector; |
41861fa8 NB |
1373 | return rc; |
1374 | } | |
1375 | ||
1376 | sector++; | |
1377 | ei_lba++; | |
1378 | offset += sizeof(struct se_dif_v1_tuple); | |
1379 | } | |
1380 | ||
1381 | kunmap_atomic(paddr); | |
1382 | kunmap_atomic(daddr); | |
1383 | } | |
41861fa8 NB |
1384 | |
1385 | return 0; | |
1386 | } | |
395ccb25 NB |
1387 | |
1388 | sense_reason_t | |
1389 | sbc_dif_read_strip(struct se_cmd *cmd) | |
1390 | { | |
1391 | struct se_device *dev = cmd->se_dev; | |
1392 | u32 sectors = cmd->prot_length / dev->prot_length; | |
1393 | ||
1394 | return __sbc_dif_verify_read(cmd, cmd->t_task_lba, sectors, 0, | |
1395 | cmd->t_prot_sg, 0); | |
1396 | } | |
1397 | ||
1398 | sense_reason_t | |
1399 | sbc_dif_verify_read(struct se_cmd *cmd, sector_t start, unsigned int sectors, | |
1400 | unsigned int ei_lba, struct scatterlist *sg, int sg_off) | |
1401 | { | |
1402 | sense_reason_t rc; | |
1403 | ||
1404 | rc = __sbc_dif_verify_read(cmd, start, sectors, ei_lba, sg, sg_off); | |
1405 | if (rc) | |
1406 | return rc; | |
1407 | ||
1408 | sbc_dif_copy_prot(cmd, sectors, true, sg, sg_off); | |
1409 | return 0; | |
1410 | } | |
41861fa8 | 1411 | EXPORT_SYMBOL(sbc_dif_verify_read); |