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 | 83 | |
2426bd45 | 84 | target_complete_cmd_with_length(cmd, GOOD, 8); |
1fd032ee CH |
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; | |
2d335983 | 92 | struct se_session *sess = cmd->se_sess; |
a50da144 PB |
93 | unsigned char *rbuf; |
94 | unsigned char buf[32]; | |
1fd032ee CH |
95 | unsigned long long blocks = dev->transport->get_blocks(dev); |
96 | ||
a50da144 | 97 | memset(buf, 0, sizeof(buf)); |
1fd032ee CH |
98 | buf[0] = (blocks >> 56) & 0xff; |
99 | buf[1] = (blocks >> 48) & 0xff; | |
100 | buf[2] = (blocks >> 40) & 0xff; | |
101 | buf[3] = (blocks >> 32) & 0xff; | |
102 | buf[4] = (blocks >> 24) & 0xff; | |
103 | buf[5] = (blocks >> 16) & 0xff; | |
104 | buf[6] = (blocks >> 8) & 0xff; | |
105 | buf[7] = blocks & 0xff; | |
0fd97ccf CH |
106 | buf[8] = (dev->dev_attrib.block_size >> 24) & 0xff; |
107 | buf[9] = (dev->dev_attrib.block_size >> 16) & 0xff; | |
108 | buf[10] = (dev->dev_attrib.block_size >> 8) & 0xff; | |
109 | buf[11] = dev->dev_attrib.block_size & 0xff; | |
56dac14c NB |
110 | /* |
111 | * Set P_TYPE and PROT_EN bits for DIF support | |
112 | */ | |
2d335983 NB |
113 | if (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) { |
114 | if (dev->dev_attrib.pi_prot_type) | |
115 | buf[12] = (dev->dev_attrib.pi_prot_type - 1) << 1 | 0x1; | |
116 | } | |
7f7caf6a AG |
117 | |
118 | if (dev->transport->get_lbppbe) | |
119 | buf[13] = dev->transport->get_lbppbe(dev) & 0x0f; | |
120 | ||
121 | if (dev->transport->get_alignment_offset_lbas) { | |
122 | u16 lalba = dev->transport->get_alignment_offset_lbas(dev); | |
123 | buf[14] = (lalba >> 8) & 0x3f; | |
124 | buf[15] = lalba & 0xff; | |
125 | } | |
126 | ||
1fd032ee CH |
127 | /* |
128 | * Set Thin Provisioning Enable bit following sbc3r22 in section | |
129 | * READ CAPACITY (16) byte 14 if emulate_tpu or emulate_tpws is enabled. | |
130 | */ | |
0fd97ccf | 131 | if (dev->dev_attrib.emulate_tpu || dev->dev_attrib.emulate_tpws) |
7f7caf6a | 132 | buf[14] |= 0x80; |
1fd032ee | 133 | |
a50da144 | 134 | rbuf = transport_kmap_data_sg(cmd); |
8b4b0dcb NB |
135 | if (rbuf) { |
136 | memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length)); | |
137 | transport_kunmap_data_sg(cmd); | |
138 | } | |
1fd032ee | 139 | |
2426bd45 | 140 | target_complete_cmd_with_length(cmd, GOOD, 32); |
1fd032ee CH |
141 | return 0; |
142 | } | |
143 | ||
972b29c8 | 144 | sector_t sbc_get_write_same_sectors(struct se_cmd *cmd) |
1fd032ee | 145 | { |
1fd032ee | 146 | u32 num_blocks; |
1fd032ee CH |
147 | |
148 | if (cmd->t_task_cdb[0] == WRITE_SAME) | |
149 | num_blocks = get_unaligned_be16(&cmd->t_task_cdb[7]); | |
150 | else if (cmd->t_task_cdb[0] == WRITE_SAME_16) | |
151 | num_blocks = get_unaligned_be32(&cmd->t_task_cdb[10]); | |
152 | else /* WRITE_SAME_32 via VARIABLE_LENGTH_CMD */ | |
153 | num_blocks = get_unaligned_be32(&cmd->t_task_cdb[28]); | |
154 | ||
155 | /* | |
156 | * Use the explicit range when non zero is supplied, otherwise calculate | |
157 | * the remaining range based on ->get_blocks() - starting LBA. | |
158 | */ | |
6f974e8c CH |
159 | if (num_blocks) |
160 | return num_blocks; | |
1fd032ee | 161 | |
6f974e8c CH |
162 | return cmd->se_dev->transport->get_blocks(cmd->se_dev) - |
163 | cmd->t_task_lba + 1; | |
1fd032ee | 164 | } |
972b29c8 | 165 | EXPORT_SYMBOL(sbc_get_write_same_sectors); |
1fd032ee | 166 | |
de103c93 | 167 | static sense_reason_t |
1920ed61 | 168 | sbc_emulate_noop(struct se_cmd *cmd) |
1a1ff38c BK |
169 | { |
170 | target_complete_cmd(cmd, GOOD); | |
171 | return 0; | |
172 | } | |
173 | ||
d6e0175c CH |
174 | static inline u32 sbc_get_size(struct se_cmd *cmd, u32 sectors) |
175 | { | |
0fd97ccf | 176 | return cmd->se_dev->dev_attrib.block_size * sectors; |
d6e0175c CH |
177 | } |
178 | ||
d6e0175c CH |
179 | static inline u32 transport_get_sectors_6(unsigned char *cdb) |
180 | { | |
181 | /* | |
182 | * Use 8-bit sector value. SBC-3 says: | |
183 | * | |
184 | * A TRANSFER LENGTH field set to zero specifies that 256 | |
185 | * logical blocks shall be written. Any other value | |
186 | * specifies the number of logical blocks that shall be | |
187 | * written. | |
188 | */ | |
189 | return cdb[4] ? : 256; | |
190 | } | |
191 | ||
192 | static inline u32 transport_get_sectors_10(unsigned char *cdb) | |
193 | { | |
194 | return (u32)(cdb[7] << 8) + cdb[8]; | |
195 | } | |
196 | ||
197 | static inline u32 transport_get_sectors_12(unsigned char *cdb) | |
198 | { | |
199 | return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9]; | |
200 | } | |
201 | ||
202 | static inline u32 transport_get_sectors_16(unsigned char *cdb) | |
203 | { | |
204 | return (u32)(cdb[10] << 24) + (cdb[11] << 16) + | |
205 | (cdb[12] << 8) + cdb[13]; | |
206 | } | |
207 | ||
208 | /* | |
209 | * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants | |
210 | */ | |
211 | static inline u32 transport_get_sectors_32(unsigned char *cdb) | |
212 | { | |
213 | return (u32)(cdb[28] << 24) + (cdb[29] << 16) + | |
214 | (cdb[30] << 8) + cdb[31]; | |
215 | ||
216 | } | |
217 | ||
218 | static inline u32 transport_lba_21(unsigned char *cdb) | |
219 | { | |
220 | return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3]; | |
221 | } | |
222 | ||
223 | static inline u32 transport_lba_32(unsigned char *cdb) | |
224 | { | |
225 | return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5]; | |
226 | } | |
227 | ||
228 | static inline unsigned long long transport_lba_64(unsigned char *cdb) | |
229 | { | |
230 | unsigned int __v1, __v2; | |
231 | ||
232 | __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5]; | |
233 | __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9]; | |
234 | ||
235 | return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; | |
236 | } | |
237 | ||
238 | /* | |
239 | * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs | |
240 | */ | |
241 | static inline unsigned long long transport_lba_64_ext(unsigned char *cdb) | |
242 | { | |
243 | unsigned int __v1, __v2; | |
244 | ||
245 | __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15]; | |
246 | __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19]; | |
247 | ||
248 | return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; | |
249 | } | |
250 | ||
cd063bef NB |
251 | static sense_reason_t |
252 | sbc_setup_write_same(struct se_cmd *cmd, unsigned char *flags, struct sbc_ops *ops) | |
d6e0175c | 253 | { |
8e575c50 NB |
254 | struct se_device *dev = cmd->se_dev; |
255 | sector_t end_lba = dev->transport->get_blocks(dev) + 1; | |
972b29c8 | 256 | unsigned int sectors = sbc_get_write_same_sectors(cmd); |
773cbaf7 | 257 | |
d6e0175c CH |
258 | if ((flags[0] & 0x04) || (flags[0] & 0x02)) { |
259 | pr_err("WRITE_SAME PBDATA and LBDATA" | |
260 | " bits not supported for Block Discard" | |
261 | " Emulation\n"); | |
cd063bef | 262 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
d6e0175c | 263 | } |
773cbaf7 NB |
264 | if (sectors > cmd->se_dev->dev_attrib.max_write_same_len) { |
265 | pr_warn("WRITE_SAME sectors: %u exceeds max_write_same_len: %u\n", | |
266 | sectors, cmd->se_dev->dev_attrib.max_write_same_len); | |
267 | return TCM_INVALID_CDB_FIELD; | |
268 | } | |
8e575c50 NB |
269 | /* |
270 | * Sanity check for LBA wrap and request past end of device. | |
271 | */ | |
272 | if (((cmd->t_task_lba + sectors) < cmd->t_task_lba) || | |
273 | ((cmd->t_task_lba + sectors) > end_lba)) { | |
274 | pr_err("WRITE_SAME exceeds last lba %llu (lba %llu, sectors %u)\n", | |
275 | (unsigned long long)end_lba, cmd->t_task_lba, sectors); | |
276 | return TCM_ADDRESS_OUT_OF_RANGE; | |
277 | } | |
278 | ||
5cb770bf RD |
279 | /* We always have ANC_SUP == 0 so setting ANCHOR is always an error */ |
280 | if (flags[0] & 0x10) { | |
281 | pr_warn("WRITE SAME with ANCHOR not supported\n"); | |
282 | return TCM_INVALID_CDB_FIELD; | |
283 | } | |
d6e0175c | 284 | /* |
cd063bef NB |
285 | * Special case for WRITE_SAME w/ UNMAP=1 that ends up getting |
286 | * translated into block discard requests within backend code. | |
d6e0175c | 287 | */ |
cd063bef NB |
288 | if (flags[0] & 0x08) { |
289 | if (!ops->execute_write_same_unmap) | |
290 | return TCM_UNSUPPORTED_SCSI_OPCODE; | |
291 | ||
292 | cmd->execute_cmd = ops->execute_write_same_unmap; | |
293 | return 0; | |
d6e0175c | 294 | } |
cd063bef NB |
295 | if (!ops->execute_write_same) |
296 | return TCM_UNSUPPORTED_SCSI_OPCODE; | |
d6e0175c | 297 | |
cd063bef | 298 | cmd->execute_cmd = ops->execute_write_same; |
d6e0175c CH |
299 | return 0; |
300 | } | |
301 | ||
a6b0133c | 302 | static sense_reason_t xdreadwrite_callback(struct se_cmd *cmd) |
d6e0175c CH |
303 | { |
304 | unsigned char *buf, *addr; | |
305 | struct scatterlist *sg; | |
306 | unsigned int offset; | |
a6b0133c NB |
307 | sense_reason_t ret = TCM_NO_SENSE; |
308 | int i, count; | |
d6e0175c CH |
309 | /* |
310 | * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command | |
311 | * | |
312 | * 1) read the specified logical block(s); | |
313 | * 2) transfer logical blocks from the data-out buffer; | |
314 | * 3) XOR the logical blocks transferred from the data-out buffer with | |
315 | * the logical blocks read, storing the resulting XOR data in a buffer; | |
316 | * 4) if the DISABLE WRITE bit is set to zero, then write the logical | |
317 | * blocks transferred from the data-out buffer; and | |
318 | * 5) transfer the resulting XOR data to the data-in buffer. | |
319 | */ | |
320 | buf = kmalloc(cmd->data_length, GFP_KERNEL); | |
321 | if (!buf) { | |
322 | pr_err("Unable to allocate xor_callback buf\n"); | |
a6b0133c | 323 | return TCM_OUT_OF_RESOURCES; |
d6e0175c CH |
324 | } |
325 | /* | |
326 | * Copy the scatterlist WRITE buffer located at cmd->t_data_sg | |
327 | * into the locally allocated *buf | |
328 | */ | |
329 | sg_copy_to_buffer(cmd->t_data_sg, | |
330 | cmd->t_data_nents, | |
331 | buf, | |
332 | cmd->data_length); | |
333 | ||
334 | /* | |
335 | * Now perform the XOR against the BIDI read memory located at | |
336 | * cmd->t_mem_bidi_list | |
337 | */ | |
338 | ||
339 | offset = 0; | |
340 | for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) { | |
341 | addr = kmap_atomic(sg_page(sg)); | |
a6b0133c NB |
342 | if (!addr) { |
343 | ret = TCM_OUT_OF_RESOURCES; | |
d6e0175c | 344 | goto out; |
a6b0133c | 345 | } |
d6e0175c CH |
346 | |
347 | for (i = 0; i < sg->length; i++) | |
348 | *(addr + sg->offset + i) ^= *(buf + offset + i); | |
349 | ||
350 | offset += sg->length; | |
351 | kunmap_atomic(addr); | |
352 | } | |
353 | ||
354 | out: | |
355 | kfree(buf); | |
a6b0133c | 356 | return ret; |
d6e0175c CH |
357 | } |
358 | ||
a82a9538 NB |
359 | static sense_reason_t |
360 | sbc_execute_rw(struct se_cmd *cmd) | |
361 | { | |
362 | return cmd->execute_rw(cmd, cmd->t_data_sg, cmd->t_data_nents, | |
363 | cmd->data_direction); | |
364 | } | |
365 | ||
68ff9b9b NB |
366 | static sense_reason_t compare_and_write_post(struct se_cmd *cmd) |
367 | { | |
368 | struct se_device *dev = cmd->se_dev; | |
369 | ||
d8855c15 NB |
370 | /* |
371 | * Only set SCF_COMPARE_AND_WRITE_POST to force a response fall-through | |
372 | * within target_complete_ok_work() if the command was successfully | |
373 | * sent to the backend driver. | |
374 | */ | |
375 | spin_lock_irq(&cmd->t_state_lock); | |
376 | if ((cmd->transport_state & CMD_T_SENT) && !cmd->scsi_status) | |
377 | cmd->se_cmd_flags |= SCF_COMPARE_AND_WRITE_POST; | |
378 | spin_unlock_irq(&cmd->t_state_lock); | |
379 | ||
68ff9b9b NB |
380 | /* |
381 | * Unlock ->caw_sem originally obtained during sbc_compare_and_write() | |
382 | * before the original READ I/O submission. | |
383 | */ | |
384 | up(&dev->caw_sem); | |
385 | ||
386 | return TCM_NO_SENSE; | |
387 | } | |
388 | ||
389 | static sense_reason_t compare_and_write_callback(struct se_cmd *cmd) | |
390 | { | |
391 | struct se_device *dev = cmd->se_dev; | |
392 | struct scatterlist *write_sg = NULL, *sg; | |
db60df88 | 393 | unsigned char *buf = NULL, *addr; |
68ff9b9b NB |
394 | struct sg_mapping_iter m; |
395 | unsigned int offset = 0, len; | |
396 | unsigned int nlbas = cmd->t_task_nolb; | |
397 | unsigned int block_size = dev->dev_attrib.block_size; | |
398 | unsigned int compare_len = (nlbas * block_size); | |
399 | sense_reason_t ret = TCM_NO_SENSE; | |
400 | int rc, i; | |
401 | ||
cf6d1f09 NB |
402 | /* |
403 | * Handle early failure in transport_generic_request_failure(), | |
404 | * which will not have taken ->caw_mutex yet.. | |
405 | */ | |
406 | if (!cmd->t_data_sg || !cmd->t_bidi_data_sg) | |
407 | return TCM_NO_SENSE; | |
db60df88 NB |
408 | /* |
409 | * Immediately exit + release dev->caw_sem if command has already | |
410 | * been failed with a non-zero SCSI status. | |
411 | */ | |
412 | if (cmd->scsi_status) { | |
413 | pr_err("compare_and_write_callback: non zero scsi_status:" | |
414 | " 0x%02x\n", cmd->scsi_status); | |
415 | goto out; | |
416 | } | |
cf6d1f09 | 417 | |
68ff9b9b NB |
418 | buf = kzalloc(cmd->data_length, GFP_KERNEL); |
419 | if (!buf) { | |
420 | pr_err("Unable to allocate compare_and_write buf\n"); | |
a2890087 NB |
421 | ret = TCM_OUT_OF_RESOURCES; |
422 | goto out; | |
68ff9b9b NB |
423 | } |
424 | ||
a1e1774c | 425 | write_sg = kmalloc(sizeof(struct scatterlist) * cmd->t_data_nents, |
68ff9b9b NB |
426 | GFP_KERNEL); |
427 | if (!write_sg) { | |
428 | pr_err("Unable to allocate compare_and_write sg\n"); | |
429 | ret = TCM_OUT_OF_RESOURCES; | |
430 | goto out; | |
431 | } | |
a1e1774c | 432 | sg_init_table(write_sg, cmd->t_data_nents); |
68ff9b9b NB |
433 | /* |
434 | * Setup verify and write data payloads from total NumberLBAs. | |
435 | */ | |
436 | rc = sg_copy_to_buffer(cmd->t_data_sg, cmd->t_data_nents, buf, | |
437 | cmd->data_length); | |
438 | if (!rc) { | |
439 | pr_err("sg_copy_to_buffer() failed for compare_and_write\n"); | |
440 | ret = TCM_OUT_OF_RESOURCES; | |
441 | goto out; | |
442 | } | |
443 | /* | |
444 | * Compare against SCSI READ payload against verify payload | |
445 | */ | |
446 | for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, i) { | |
447 | addr = (unsigned char *)kmap_atomic(sg_page(sg)); | |
448 | if (!addr) { | |
449 | ret = TCM_OUT_OF_RESOURCES; | |
450 | goto out; | |
451 | } | |
452 | ||
453 | len = min(sg->length, compare_len); | |
454 | ||
455 | if (memcmp(addr, buf + offset, len)) { | |
456 | pr_warn("Detected MISCOMPARE for addr: %p buf: %p\n", | |
457 | addr, buf + offset); | |
458 | kunmap_atomic(addr); | |
459 | goto miscompare; | |
460 | } | |
461 | kunmap_atomic(addr); | |
462 | ||
463 | offset += len; | |
464 | compare_len -= len; | |
465 | if (!compare_len) | |
466 | break; | |
467 | } | |
468 | ||
469 | i = 0; | |
470 | len = cmd->t_task_nolb * block_size; | |
471 | sg_miter_start(&m, cmd->t_data_sg, cmd->t_data_nents, SG_MITER_TO_SG); | |
472 | /* | |
473 | * Currently assumes NoLB=1 and SGLs are PAGE_SIZE.. | |
474 | */ | |
475 | while (len) { | |
476 | sg_miter_next(&m); | |
477 | ||
478 | if (block_size < PAGE_SIZE) { | |
479 | sg_set_page(&write_sg[i], m.page, block_size, | |
480 | block_size); | |
481 | } else { | |
482 | sg_miter_next(&m); | |
483 | sg_set_page(&write_sg[i], m.page, block_size, | |
484 | 0); | |
485 | } | |
486 | len -= block_size; | |
487 | i++; | |
488 | } | |
489 | sg_miter_stop(&m); | |
490 | /* | |
491 | * Save the original SGL + nents values before updating to new | |
492 | * assignments, to be released in transport_free_pages() -> | |
493 | * transport_reset_sgl_orig() | |
494 | */ | |
495 | cmd->t_data_sg_orig = cmd->t_data_sg; | |
496 | cmd->t_data_sg = write_sg; | |
497 | cmd->t_data_nents_orig = cmd->t_data_nents; | |
498 | cmd->t_data_nents = 1; | |
499 | ||
68d81f40 | 500 | cmd->sam_task_attr = TCM_HEAD_TAG; |
68ff9b9b NB |
501 | cmd->transport_complete_callback = compare_and_write_post; |
502 | /* | |
503 | * Now reset ->execute_cmd() to the normal sbc_execute_rw() handler | |
504 | * for submitting the adjusted SGL to write instance user-data. | |
505 | */ | |
506 | cmd->execute_cmd = sbc_execute_rw; | |
507 | ||
508 | spin_lock_irq(&cmd->t_state_lock); | |
509 | cmd->t_state = TRANSPORT_PROCESSING; | |
510 | cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT; | |
511 | spin_unlock_irq(&cmd->t_state_lock); | |
512 | ||
513 | __target_execute_cmd(cmd); | |
514 | ||
515 | kfree(buf); | |
516 | return ret; | |
517 | ||
518 | miscompare: | |
519 | pr_warn("Target/%s: Send MISCOMPARE check condition and sense\n", | |
520 | dev->transport->name); | |
521 | ret = TCM_MISCOMPARE_VERIFY; | |
522 | out: | |
523 | /* | |
524 | * In the MISCOMPARE or failure case, unlock ->caw_sem obtained in | |
525 | * sbc_compare_and_write() before the original READ I/O submission. | |
526 | */ | |
527 | up(&dev->caw_sem); | |
528 | kfree(write_sg); | |
529 | kfree(buf); | |
530 | return ret; | |
531 | } | |
532 | ||
533 | static sense_reason_t | |
534 | sbc_compare_and_write(struct se_cmd *cmd) | |
535 | { | |
536 | struct se_device *dev = cmd->se_dev; | |
537 | sense_reason_t ret; | |
538 | int rc; | |
539 | /* | |
540 | * Submit the READ first for COMPARE_AND_WRITE to perform the | |
541 | * comparision using SGLs at cmd->t_bidi_data_sg.. | |
542 | */ | |
543 | rc = down_interruptible(&dev->caw_sem); | |
544 | if ((rc != 0) || signal_pending(current)) { | |
545 | cmd->transport_complete_callback = NULL; | |
546 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
547 | } | |
b7191253 NB |
548 | /* |
549 | * Reset cmd->data_length to individual block_size in order to not | |
550 | * confuse backend drivers that depend on this value matching the | |
551 | * size of the I/O being submitted. | |
552 | */ | |
553 | cmd->data_length = cmd->t_task_nolb * dev->dev_attrib.block_size; | |
68ff9b9b NB |
554 | |
555 | ret = cmd->execute_rw(cmd, cmd->t_bidi_data_sg, cmd->t_bidi_data_nents, | |
556 | DMA_FROM_DEVICE); | |
557 | if (ret) { | |
558 | cmd->transport_complete_callback = NULL; | |
559 | up(&dev->caw_sem); | |
560 | return ret; | |
561 | } | |
562 | /* | |
563 | * Unlock of dev->caw_sem to occur in compare_and_write_callback() | |
564 | * upon MISCOMPARE, or in compare_and_write_done() upon completion | |
565 | * of WRITE instance user-data. | |
566 | */ | |
567 | return TCM_NO_SENSE; | |
568 | } | |
569 | ||
19f9361a SG |
570 | static int |
571 | sbc_set_prot_op_checks(u8 protect, enum target_prot_type prot_type, | |
572 | bool is_write, struct se_cmd *cmd) | |
573 | { | |
574 | if (is_write) { | |
575 | cmd->prot_op = protect ? TARGET_PROT_DOUT_PASS : | |
576 | TARGET_PROT_DOUT_INSERT; | |
577 | switch (protect) { | |
578 | case 0x0: | |
579 | case 0x3: | |
580 | cmd->prot_checks = 0; | |
581 | break; | |
582 | case 0x1: | |
583 | case 0x5: | |
584 | cmd->prot_checks = TARGET_DIF_CHECK_GUARD; | |
585 | if (prot_type == TARGET_DIF_TYPE1_PROT) | |
586 | cmd->prot_checks |= TARGET_DIF_CHECK_REFTAG; | |
587 | break; | |
588 | case 0x2: | |
589 | if (prot_type == TARGET_DIF_TYPE1_PROT) | |
590 | cmd->prot_checks = TARGET_DIF_CHECK_REFTAG; | |
591 | break; | |
592 | case 0x4: | |
593 | cmd->prot_checks = TARGET_DIF_CHECK_GUARD; | |
594 | break; | |
595 | default: | |
596 | pr_err("Unsupported protect field %d\n", protect); | |
597 | return -EINVAL; | |
598 | } | |
599 | } else { | |
600 | cmd->prot_op = protect ? TARGET_PROT_DIN_PASS : | |
601 | TARGET_PROT_DIN_STRIP; | |
602 | switch (protect) { | |
603 | case 0x0: | |
604 | case 0x1: | |
605 | case 0x5: | |
606 | cmd->prot_checks = TARGET_DIF_CHECK_GUARD; | |
607 | if (prot_type == TARGET_DIF_TYPE1_PROT) | |
608 | cmd->prot_checks |= TARGET_DIF_CHECK_REFTAG; | |
609 | break; | |
610 | case 0x2: | |
611 | if (prot_type == TARGET_DIF_TYPE1_PROT) | |
612 | cmd->prot_checks = TARGET_DIF_CHECK_REFTAG; | |
613 | break; | |
614 | case 0x3: | |
615 | cmd->prot_checks = 0; | |
616 | break; | |
617 | case 0x4: | |
618 | cmd->prot_checks = TARGET_DIF_CHECK_GUARD; | |
619 | break; | |
620 | default: | |
621 | pr_err("Unsupported protect field %d\n", protect); | |
622 | return -EINVAL; | |
623 | } | |
624 | } | |
625 | ||
626 | return 0; | |
627 | } | |
628 | ||
499bf77b NB |
629 | static bool |
630 | sbc_check_prot(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb, | |
19f9361a | 631 | u32 sectors, bool is_write) |
499bf77b | 632 | { |
19f9361a SG |
633 | u8 protect = cdb[1] >> 5; |
634 | ||
b5b8e298 | 635 | if ((!cmd->t_prot_sg || !cmd->t_prot_nents) && cmd->prot_pto) |
499bf77b NB |
636 | return true; |
637 | ||
638 | switch (dev->dev_attrib.pi_prot_type) { | |
639 | case TARGET_DIF_TYPE3_PROT: | |
499bf77b NB |
640 | cmd->reftag_seed = 0xffffffff; |
641 | break; | |
642 | case TARGET_DIF_TYPE2_PROT: | |
19f9361a | 643 | if (protect) |
499bf77b NB |
644 | return false; |
645 | ||
646 | cmd->reftag_seed = cmd->t_task_lba; | |
647 | break; | |
648 | case TARGET_DIF_TYPE1_PROT: | |
499bf77b NB |
649 | cmd->reftag_seed = cmd->t_task_lba; |
650 | break; | |
651 | case TARGET_DIF_TYPE0_PROT: | |
652 | default: | |
653 | return true; | |
654 | } | |
655 | ||
19f9361a SG |
656 | if (sbc_set_prot_op_checks(protect, dev->dev_attrib.pi_prot_type, |
657 | is_write, cmd)) | |
658 | return false; | |
659 | ||
499bf77b NB |
660 | cmd->prot_type = dev->dev_attrib.pi_prot_type; |
661 | cmd->prot_length = dev->prot_length * sectors; | |
e2a4f55c SG |
662 | |
663 | /** | |
664 | * In case protection information exists over the wire | |
665 | * we modify command data length to describe pure data. | |
666 | * The actual transfer length is data length + protection | |
667 | * length | |
668 | **/ | |
669 | if (protect) | |
670 | cmd->data_length = sectors * dev->dev_attrib.block_size; | |
671 | ||
672 | pr_debug("%s: prot_type=%d, data_length=%d, prot_length=%d " | |
673 | "prot_op=%d prot_checks=%d\n", | |
674 | __func__, cmd->prot_type, cmd->data_length, cmd->prot_length, | |
03abad9e | 675 | cmd->prot_op, cmd->prot_checks); |
499bf77b NB |
676 | |
677 | return true; | |
678 | } | |
679 | ||
de103c93 CH |
680 | sense_reason_t |
681 | sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops) | |
d6e0175c | 682 | { |
d6e0175c CH |
683 | struct se_device *dev = cmd->se_dev; |
684 | unsigned char *cdb = cmd->t_task_cdb; | |
1fd032ee | 685 | unsigned int size; |
d6e0175c | 686 | u32 sectors = 0; |
de103c93 | 687 | sense_reason_t ret; |
d6e0175c CH |
688 | |
689 | switch (cdb[0]) { | |
690 | case READ_6: | |
691 | sectors = transport_get_sectors_6(cdb); | |
692 | cmd->t_task_lba = transport_lba_21(cdb); | |
693 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
a82a9538 NB |
694 | cmd->execute_rw = ops->execute_rw; |
695 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c CH |
696 | break; |
697 | case READ_10: | |
698 | sectors = transport_get_sectors_10(cdb); | |
699 | cmd->t_task_lba = transport_lba_32(cdb); | |
499bf77b | 700 | |
19f9361a | 701 | if (!sbc_check_prot(dev, cmd, cdb, sectors, false)) |
499bf77b NB |
702 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
703 | ||
d6e0175c | 704 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
a82a9538 NB |
705 | cmd->execute_rw = ops->execute_rw; |
706 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c CH |
707 | break; |
708 | case READ_12: | |
709 | sectors = transport_get_sectors_12(cdb); | |
710 | cmd->t_task_lba = transport_lba_32(cdb); | |
499bf77b | 711 | |
19f9361a | 712 | if (!sbc_check_prot(dev, cmd, cdb, sectors, false)) |
499bf77b NB |
713 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
714 | ||
d6e0175c | 715 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
a82a9538 NB |
716 | cmd->execute_rw = ops->execute_rw; |
717 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c CH |
718 | break; |
719 | case READ_16: | |
720 | sectors = transport_get_sectors_16(cdb); | |
721 | cmd->t_task_lba = transport_lba_64(cdb); | |
499bf77b | 722 | |
19f9361a | 723 | if (!sbc_check_prot(dev, cmd, cdb, sectors, false)) |
499bf77b NB |
724 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
725 | ||
d6e0175c | 726 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
a82a9538 NB |
727 | cmd->execute_rw = ops->execute_rw; |
728 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c CH |
729 | break; |
730 | case WRITE_6: | |
731 | sectors = transport_get_sectors_6(cdb); | |
732 | cmd->t_task_lba = transport_lba_21(cdb); | |
733 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
a82a9538 NB |
734 | cmd->execute_rw = ops->execute_rw; |
735 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c CH |
736 | break; |
737 | case WRITE_10: | |
738 | case WRITE_VERIFY: | |
739 | sectors = transport_get_sectors_10(cdb); | |
740 | cmd->t_task_lba = transport_lba_32(cdb); | |
499bf77b | 741 | |
19f9361a | 742 | if (!sbc_check_prot(dev, cmd, cdb, sectors, true)) |
499bf77b NB |
743 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
744 | ||
d6e0175c CH |
745 | if (cdb[1] & 0x8) |
746 | cmd->se_cmd_flags |= SCF_FUA; | |
747 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
a82a9538 NB |
748 | cmd->execute_rw = ops->execute_rw; |
749 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c CH |
750 | break; |
751 | case WRITE_12: | |
752 | sectors = transport_get_sectors_12(cdb); | |
753 | cmd->t_task_lba = transport_lba_32(cdb); | |
499bf77b | 754 | |
19f9361a | 755 | if (!sbc_check_prot(dev, cmd, cdb, sectors, true)) |
499bf77b NB |
756 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
757 | ||
d6e0175c CH |
758 | if (cdb[1] & 0x8) |
759 | cmd->se_cmd_flags |= SCF_FUA; | |
760 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
a82a9538 NB |
761 | cmd->execute_rw = ops->execute_rw; |
762 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c CH |
763 | break; |
764 | case WRITE_16: | |
765 | sectors = transport_get_sectors_16(cdb); | |
766 | cmd->t_task_lba = transport_lba_64(cdb); | |
499bf77b | 767 | |
19f9361a | 768 | if (!sbc_check_prot(dev, cmd, cdb, sectors, true)) |
499bf77b NB |
769 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
770 | ||
d6e0175c CH |
771 | if (cdb[1] & 0x8) |
772 | cmd->se_cmd_flags |= SCF_FUA; | |
773 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
a82a9538 NB |
774 | cmd->execute_rw = ops->execute_rw; |
775 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c CH |
776 | break; |
777 | case XDWRITEREAD_10: | |
de103c93 | 778 | if (cmd->data_direction != DMA_TO_DEVICE || |
d6e0175c | 779 | !(cmd->se_cmd_flags & SCF_BIDI)) |
de103c93 | 780 | return TCM_INVALID_CDB_FIELD; |
d6e0175c CH |
781 | sectors = transport_get_sectors_10(cdb); |
782 | ||
783 | cmd->t_task_lba = transport_lba_32(cdb); | |
784 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
785 | ||
786 | /* | |
787 | * Setup BIDI XOR callback to be run after I/O completion. | |
788 | */ | |
a82a9538 NB |
789 | cmd->execute_rw = ops->execute_rw; |
790 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c CH |
791 | cmd->transport_complete_callback = &xdreadwrite_callback; |
792 | if (cdb[1] & 0x8) | |
793 | cmd->se_cmd_flags |= SCF_FUA; | |
794 | break; | |
795 | case VARIABLE_LENGTH_CMD: | |
796 | { | |
797 | u16 service_action = get_unaligned_be16(&cdb[8]); | |
798 | switch (service_action) { | |
799 | case XDWRITEREAD_32: | |
800 | sectors = transport_get_sectors_32(cdb); | |
801 | ||
802 | /* | |
803 | * Use WRITE_32 and READ_32 opcodes for the emulated | |
804 | * XDWRITE_READ_32 logic. | |
805 | */ | |
806 | cmd->t_task_lba = transport_lba_64_ext(cdb); | |
807 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
808 | ||
809 | /* | |
810 | * Setup BIDI XOR callback to be run during after I/O | |
811 | * completion. | |
812 | */ | |
a82a9538 NB |
813 | cmd->execute_rw = ops->execute_rw; |
814 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c CH |
815 | cmd->transport_complete_callback = &xdreadwrite_callback; |
816 | if (cdb[1] & 0x8) | |
817 | cmd->se_cmd_flags |= SCF_FUA; | |
818 | break; | |
819 | case WRITE_SAME_32: | |
820 | sectors = transport_get_sectors_32(cdb); | |
821 | if (!sectors) { | |
822 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not" | |
823 | " supported\n"); | |
de103c93 | 824 | return TCM_INVALID_CDB_FIELD; |
d6e0175c CH |
825 | } |
826 | ||
1fd032ee | 827 | size = sbc_get_size(cmd, 1); |
d6e0175c CH |
828 | cmd->t_task_lba = get_unaligned_be64(&cdb[12]); |
829 | ||
cd063bef | 830 | ret = sbc_setup_write_same(cmd, &cdb[10], ops); |
6b64e1fe | 831 | if (ret) |
cd063bef | 832 | return ret; |
d6e0175c CH |
833 | break; |
834 | default: | |
835 | pr_err("VARIABLE_LENGTH_CMD service action" | |
836 | " 0x%04x not supported\n", service_action); | |
de103c93 | 837 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
d6e0175c CH |
838 | } |
839 | break; | |
840 | } | |
68ff9b9b NB |
841 | case COMPARE_AND_WRITE: |
842 | sectors = cdb[13]; | |
843 | /* | |
844 | * Currently enforce COMPARE_AND_WRITE for a single sector | |
845 | */ | |
846 | if (sectors > 1) { | |
847 | pr_err("COMPARE_AND_WRITE contains NoLB: %u greater" | |
848 | " than 1\n", sectors); | |
849 | return TCM_INVALID_CDB_FIELD; | |
850 | } | |
851 | /* | |
852 | * Double size because we have two buffers, note that | |
853 | * zero is not an error.. | |
854 | */ | |
855 | size = 2 * sbc_get_size(cmd, sectors); | |
856 | cmd->t_task_lba = get_unaligned_be64(&cdb[2]); | |
857 | cmd->t_task_nolb = sectors; | |
858 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB | SCF_COMPARE_AND_WRITE; | |
859 | cmd->execute_rw = ops->execute_rw; | |
860 | cmd->execute_cmd = sbc_compare_and_write; | |
861 | cmd->transport_complete_callback = compare_and_write_callback; | |
862 | break; | |
d6e0175c | 863 | case READ_CAPACITY: |
1fd032ee CH |
864 | size = READ_CAP_LEN; |
865 | cmd->execute_cmd = sbc_emulate_readcapacity; | |
d6e0175c | 866 | break; |
eb846d9f | 867 | case SERVICE_ACTION_IN_16: |
d6e0175c CH |
868 | switch (cmd->t_task_cdb[1] & 0x1f) { |
869 | case SAI_READ_CAPACITY_16: | |
1fd032ee | 870 | cmd->execute_cmd = sbc_emulate_readcapacity_16; |
d6e0175c | 871 | break; |
c66094bf HR |
872 | case SAI_REPORT_REFERRALS: |
873 | cmd->execute_cmd = target_emulate_report_referrals; | |
874 | break; | |
d6e0175c CH |
875 | default: |
876 | pr_err("Unsupported SA: 0x%02x\n", | |
877 | cmd->t_task_cdb[1] & 0x1f); | |
de103c93 | 878 | return TCM_INVALID_CDB_FIELD; |
d6e0175c | 879 | } |
1fd032ee | 880 | size = (cdb[10] << 24) | (cdb[11] << 16) | |
d6e0175c CH |
881 | (cdb[12] << 8) | cdb[13]; |
882 | break; | |
883 | case SYNCHRONIZE_CACHE: | |
884 | case SYNCHRONIZE_CACHE_16: | |
d6e0175c CH |
885 | if (cdb[0] == SYNCHRONIZE_CACHE) { |
886 | sectors = transport_get_sectors_10(cdb); | |
887 | cmd->t_task_lba = transport_lba_32(cdb); | |
888 | } else { | |
889 | sectors = transport_get_sectors_16(cdb); | |
890 | cmd->t_task_lba = transport_lba_64(cdb); | |
891 | } | |
6ef31dc7 CVB |
892 | if (ops->execute_sync_cache) { |
893 | cmd->execute_cmd = ops->execute_sync_cache; | |
894 | goto check_lba; | |
d6e0175c | 895 | } |
6ef31dc7 CVB |
896 | size = 0; |
897 | cmd->execute_cmd = sbc_emulate_noop; | |
d6e0175c CH |
898 | break; |
899 | case UNMAP: | |
14150a6b | 900 | if (!ops->execute_unmap) |
de103c93 | 901 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
14150a6b | 902 | |
1fd032ee | 903 | size = get_unaligned_be16(&cdb[7]); |
14150a6b | 904 | cmd->execute_cmd = ops->execute_unmap; |
d6e0175c CH |
905 | break; |
906 | case WRITE_SAME_16: | |
907 | sectors = transport_get_sectors_16(cdb); | |
908 | if (!sectors) { | |
909 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); | |
de103c93 | 910 | return TCM_INVALID_CDB_FIELD; |
d6e0175c CH |
911 | } |
912 | ||
1fd032ee | 913 | size = sbc_get_size(cmd, 1); |
d6e0175c CH |
914 | cmd->t_task_lba = get_unaligned_be64(&cdb[2]); |
915 | ||
cd063bef | 916 | ret = sbc_setup_write_same(cmd, &cdb[1], ops); |
6b64e1fe | 917 | if (ret) |
cd063bef | 918 | return ret; |
d6e0175c CH |
919 | break; |
920 | case WRITE_SAME: | |
921 | sectors = transport_get_sectors_10(cdb); | |
922 | if (!sectors) { | |
923 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); | |
de103c93 | 924 | return TCM_INVALID_CDB_FIELD; |
d6e0175c CH |
925 | } |
926 | ||
1fd032ee | 927 | size = sbc_get_size(cmd, 1); |
d6e0175c CH |
928 | cmd->t_task_lba = get_unaligned_be32(&cdb[2]); |
929 | ||
930 | /* | |
931 | * Follow sbcr26 with WRITE_SAME (10) and check for the existence | |
932 | * of byte 1 bit 3 UNMAP instead of original reserved field | |
933 | */ | |
cd063bef | 934 | ret = sbc_setup_write_same(cmd, &cdb[1], ops); |
6b64e1fe | 935 | if (ret) |
cd063bef | 936 | return ret; |
d6e0175c CH |
937 | break; |
938 | case VERIFY: | |
1fd032ee | 939 | size = 0; |
c52716de CVB |
940 | sectors = transport_get_sectors_10(cdb); |
941 | cmd->t_task_lba = transport_lba_32(cdb); | |
1920ed61 | 942 | cmd->execute_cmd = sbc_emulate_noop; |
c52716de | 943 | goto check_lba; |
1a1ff38c BK |
944 | case REZERO_UNIT: |
945 | case SEEK_6: | |
946 | case SEEK_10: | |
947 | /* | |
948 | * There are still clients out there which use these old SCSI-2 | |
949 | * commands. This mainly happens when running VMs with legacy | |
950 | * guest systems, connected via SCSI command pass-through to | |
951 | * iSCSI targets. Make them happy and return status GOOD. | |
952 | */ | |
953 | size = 0; | |
954 | cmd->execute_cmd = sbc_emulate_noop; | |
955 | break; | |
d6e0175c | 956 | default: |
1fd032ee | 957 | ret = spc_parse_cdb(cmd, &size); |
d6e0175c CH |
958 | if (ret) |
959 | return ret; | |
960 | } | |
961 | ||
962 | /* reject any command that we don't have a handler for */ | |
20959c4b | 963 | if (!cmd->execute_cmd) |
de103c93 | 964 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
d6e0175c CH |
965 | |
966 | if (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) { | |
1fd032ee CH |
967 | unsigned long long end_lba; |
968 | ||
0fd97ccf | 969 | if (sectors > dev->dev_attrib.fabric_max_sectors) { |
d6e0175c CH |
970 | printk_ratelimited(KERN_ERR "SCSI OP %02xh with too" |
971 | " big sectors %u exceeds fabric_max_sectors:" | |
972 | " %u\n", cdb[0], sectors, | |
0fd97ccf | 973 | dev->dev_attrib.fabric_max_sectors); |
de103c93 | 974 | return TCM_INVALID_CDB_FIELD; |
d6e0175c | 975 | } |
0fd97ccf | 976 | if (sectors > dev->dev_attrib.hw_max_sectors) { |
d6e0175c CH |
977 | printk_ratelimited(KERN_ERR "SCSI OP %02xh with too" |
978 | " big sectors %u exceeds backend hw_max_sectors:" | |
979 | " %u\n", cdb[0], sectors, | |
0fd97ccf | 980 | dev->dev_attrib.hw_max_sectors); |
de103c93 | 981 | return TCM_INVALID_CDB_FIELD; |
d6e0175c | 982 | } |
6ef31dc7 | 983 | check_lba: |
1fd032ee CH |
984 | end_lba = dev->transport->get_blocks(dev) + 1; |
985 | if (cmd->t_task_lba + sectors > end_lba) { | |
986 | pr_err("cmd exceeds last lba %llu " | |
987 | "(lba %llu, sectors %u)\n", | |
988 | end_lba, cmd->t_task_lba, sectors); | |
09ceadc7 | 989 | return TCM_ADDRESS_OUT_OF_RANGE; |
1fd032ee CH |
990 | } |
991 | ||
68ff9b9b NB |
992 | if (!(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) |
993 | size = sbc_get_size(cmd, sectors); | |
d6e0175c CH |
994 | } |
995 | ||
de103c93 | 996 | return target_cmd_size_check(cmd, size); |
d6e0175c CH |
997 | } |
998 | EXPORT_SYMBOL(sbc_parse_cdb); | |
6f23ac8a | 999 | |
6f23ac8a CH |
1000 | u32 sbc_get_device_type(struct se_device *dev) |
1001 | { | |
1002 | return TYPE_DISK; | |
1003 | } | |
1004 | EXPORT_SYMBOL(sbc_get_device_type); | |
86d71829 AH |
1005 | |
1006 | sense_reason_t | |
1007 | sbc_execute_unmap(struct se_cmd *cmd, | |
1008 | sense_reason_t (*do_unmap_fn)(struct se_cmd *, void *, | |
1009 | sector_t, sector_t), | |
1010 | void *priv) | |
1011 | { | |
1012 | struct se_device *dev = cmd->se_dev; | |
1013 | unsigned char *buf, *ptr = NULL; | |
1014 | sector_t lba; | |
1015 | int size; | |
1016 | u32 range; | |
1017 | sense_reason_t ret = 0; | |
1018 | int dl, bd_dl; | |
1019 | ||
1020 | /* We never set ANC_SUP */ | |
1021 | if (cmd->t_task_cdb[1]) | |
1022 | return TCM_INVALID_CDB_FIELD; | |
1023 | ||
1024 | if (cmd->data_length == 0) { | |
1025 | target_complete_cmd(cmd, SAM_STAT_GOOD); | |
1026 | return 0; | |
1027 | } | |
1028 | ||
1029 | if (cmd->data_length < 8) { | |
1030 | pr_warn("UNMAP parameter list length %u too small\n", | |
1031 | cmd->data_length); | |
1032 | return TCM_PARAMETER_LIST_LENGTH_ERROR; | |
1033 | } | |
1034 | ||
1035 | buf = transport_kmap_data_sg(cmd); | |
1036 | if (!buf) | |
1037 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
1038 | ||
1039 | dl = get_unaligned_be16(&buf[0]); | |
1040 | bd_dl = get_unaligned_be16(&buf[2]); | |
1041 | ||
1042 | size = cmd->data_length - 8; | |
1043 | if (bd_dl > size) | |
1044 | pr_warn("UNMAP parameter list length %u too small, ignoring bd_dl %u\n", | |
1045 | cmd->data_length, bd_dl); | |
1046 | else | |
1047 | size = bd_dl; | |
1048 | ||
1049 | if (size / 16 > dev->dev_attrib.max_unmap_block_desc_count) { | |
1050 | ret = TCM_INVALID_PARAMETER_LIST; | |
1051 | goto err; | |
1052 | } | |
1053 | ||
1054 | /* First UNMAP block descriptor starts at 8 byte offset */ | |
1055 | ptr = &buf[8]; | |
1056 | pr_debug("UNMAP: Sub: %s Using dl: %u bd_dl: %u size: %u" | |
1057 | " ptr: %p\n", dev->transport->name, dl, bd_dl, size, ptr); | |
1058 | ||
1059 | while (size >= 16) { | |
1060 | lba = get_unaligned_be64(&ptr[0]); | |
1061 | range = get_unaligned_be32(&ptr[8]); | |
1062 | pr_debug("UNMAP: Using lba: %llu and range: %u\n", | |
1063 | (unsigned long long)lba, range); | |
1064 | ||
1065 | if (range > dev->dev_attrib.max_unmap_lba_count) { | |
1066 | ret = TCM_INVALID_PARAMETER_LIST; | |
1067 | goto err; | |
1068 | } | |
1069 | ||
1070 | if (lba + range > dev->transport->get_blocks(dev) + 1) { | |
1071 | ret = TCM_ADDRESS_OUT_OF_RANGE; | |
1072 | goto err; | |
1073 | } | |
1074 | ||
1075 | ret = do_unmap_fn(cmd, priv, lba, range); | |
1076 | if (ret) | |
1077 | goto err; | |
1078 | ||
1079 | ptr += 16; | |
1080 | size -= 16; | |
1081 | } | |
1082 | ||
1083 | err: | |
1084 | transport_kunmap_data_sg(cmd); | |
1085 | if (!ret) | |
1086 | target_complete_cmd(cmd, GOOD); | |
1087 | return ret; | |
1088 | } | |
1089 | EXPORT_SYMBOL(sbc_execute_unmap); | |
41861fa8 | 1090 | |
66a3d5bc NB |
1091 | void |
1092 | sbc_dif_generate(struct se_cmd *cmd) | |
1093 | { | |
1094 | struct se_device *dev = cmd->se_dev; | |
1095 | struct se_dif_v1_tuple *sdt; | |
1096 | struct scatterlist *dsg, *psg = cmd->t_prot_sg; | |
1097 | sector_t sector = cmd->t_task_lba; | |
1098 | void *daddr, *paddr; | |
1099 | int i, j, offset = 0; | |
1100 | ||
1101 | for_each_sg(cmd->t_data_sg, dsg, cmd->t_data_nents, i) { | |
1102 | daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; | |
1103 | paddr = kmap_atomic(sg_page(psg)) + psg->offset; | |
1104 | ||
1105 | for (j = 0; j < dsg->length; j += dev->dev_attrib.block_size) { | |
1106 | ||
1107 | if (offset >= psg->length) { | |
1108 | kunmap_atomic(paddr); | |
1109 | psg = sg_next(psg); | |
1110 | paddr = kmap_atomic(sg_page(psg)) + psg->offset; | |
1111 | offset = 0; | |
1112 | } | |
1113 | ||
1114 | sdt = paddr + offset; | |
1115 | sdt->guard_tag = cpu_to_be16(crc_t10dif(daddr + j, | |
1116 | dev->dev_attrib.block_size)); | |
1117 | if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE1_PROT) | |
1118 | sdt->ref_tag = cpu_to_be32(sector & 0xffffffff); | |
1119 | sdt->app_tag = 0; | |
1120 | ||
1121 | pr_debug("DIF WRITE INSERT sector: %llu guard_tag: 0x%04x" | |
1122 | " app_tag: 0x%04x ref_tag: %u\n", | |
1123 | (unsigned long long)sector, sdt->guard_tag, | |
1124 | sdt->app_tag, be32_to_cpu(sdt->ref_tag)); | |
1125 | ||
1126 | sector++; | |
1127 | offset += sizeof(struct se_dif_v1_tuple); | |
1128 | } | |
1129 | ||
1130 | kunmap_atomic(paddr); | |
1131 | kunmap_atomic(daddr); | |
1132 | } | |
1133 | } | |
1134 | ||
41861fa8 NB |
1135 | static sense_reason_t |
1136 | sbc_dif_v1_verify(struct se_device *dev, struct se_dif_v1_tuple *sdt, | |
1137 | const void *p, sector_t sector, unsigned int ei_lba) | |
1138 | { | |
1139 | int block_size = dev->dev_attrib.block_size; | |
1140 | __be16 csum; | |
1141 | ||
1142 | csum = cpu_to_be16(crc_t10dif(p, block_size)); | |
1143 | ||
1144 | if (sdt->guard_tag != csum) { | |
1145 | pr_err("DIFv1 checksum failed on sector %llu guard tag 0x%04x" | |
1146 | " csum 0x%04x\n", (unsigned long long)sector, | |
1147 | be16_to_cpu(sdt->guard_tag), be16_to_cpu(csum)); | |
1148 | return TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED; | |
1149 | } | |
1150 | ||
1151 | if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE1_PROT && | |
1152 | be32_to_cpu(sdt->ref_tag) != (sector & 0xffffffff)) { | |
1153 | pr_err("DIFv1 Type 1 reference failed on sector: %llu tag: 0x%08x" | |
1154 | " sector MSB: 0x%08x\n", (unsigned long long)sector, | |
1155 | be32_to_cpu(sdt->ref_tag), (u32)(sector & 0xffffffff)); | |
1156 | return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED; | |
1157 | } | |
1158 | ||
1159 | if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE2_PROT && | |
1160 | be32_to_cpu(sdt->ref_tag) != ei_lba) { | |
1161 | pr_err("DIFv1 Type 2 reference failed on sector: %llu tag: 0x%08x" | |
1162 | " ei_lba: 0x%08x\n", (unsigned long long)sector, | |
1163 | be32_to_cpu(sdt->ref_tag), ei_lba); | |
1164 | return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED; | |
1165 | } | |
1166 | ||
1167 | return 0; | |
1168 | } | |
1169 | ||
1170 | static void | |
1171 | sbc_dif_copy_prot(struct se_cmd *cmd, unsigned int sectors, bool read, | |
1172 | struct scatterlist *sg, int sg_off) | |
1173 | { | |
1174 | struct se_device *dev = cmd->se_dev; | |
1175 | struct scatterlist *psg; | |
1176 | void *paddr, *addr; | |
1177 | unsigned int i, len, left; | |
10762e80 | 1178 | unsigned int offset = sg_off; |
41861fa8 NB |
1179 | |
1180 | left = sectors * dev->prot_length; | |
1181 | ||
1182 | for_each_sg(cmd->t_prot_sg, psg, cmd->t_prot_nents, i) { | |
16c0ae02 | 1183 | unsigned int psg_len, copied = 0; |
d6a65fdc | 1184 | |
41861fa8 | 1185 | paddr = kmap_atomic(sg_page(psg)) + psg->offset; |
16c0ae02 SG |
1186 | psg_len = min(left, psg->length); |
1187 | while (psg_len) { | |
1188 | len = min(psg_len, sg->length - offset); | |
1189 | addr = kmap_atomic(sg_page(sg)) + sg->offset + offset; | |
1190 | ||
1191 | if (read) | |
1192 | memcpy(paddr + copied, addr, len); | |
1193 | else | |
1194 | memcpy(addr, paddr + copied, len); | |
1195 | ||
1196 | left -= len; | |
1197 | offset += len; | |
1198 | copied += len; | |
1199 | psg_len -= len; | |
1200 | ||
1201 | if (offset >= sg->length) { | |
1202 | sg = sg_next(sg); | |
1203 | offset = 0; | |
1204 | } | |
1205 | kunmap_atomic(addr); | |
1206 | } | |
41861fa8 | 1207 | kunmap_atomic(paddr); |
41861fa8 NB |
1208 | } |
1209 | } | |
1210 | ||
1211 | sense_reason_t | |
1212 | sbc_dif_verify_write(struct se_cmd *cmd, sector_t start, unsigned int sectors, | |
1213 | unsigned int ei_lba, struct scatterlist *sg, int sg_off) | |
1214 | { | |
1215 | struct se_device *dev = cmd->se_dev; | |
1216 | struct se_dif_v1_tuple *sdt; | |
1217 | struct scatterlist *dsg, *psg = cmd->t_prot_sg; | |
1218 | sector_t sector = start; | |
1219 | void *daddr, *paddr; | |
1220 | int i, j, offset = 0; | |
1221 | sense_reason_t rc; | |
1222 | ||
1223 | for_each_sg(cmd->t_data_sg, dsg, cmd->t_data_nents, i) { | |
1224 | daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; | |
1225 | paddr = kmap_atomic(sg_page(psg)) + psg->offset; | |
1226 | ||
1227 | for (j = 0; j < dsg->length; j += dev->dev_attrib.block_size) { | |
1228 | ||
1229 | if (offset >= psg->length) { | |
1230 | kunmap_atomic(paddr); | |
1231 | psg = sg_next(psg); | |
1232 | paddr = kmap_atomic(sg_page(psg)) + psg->offset; | |
1233 | offset = 0; | |
1234 | } | |
1235 | ||
1236 | sdt = paddr + offset; | |
1237 | ||
1238 | pr_debug("DIF WRITE sector: %llu guard_tag: 0x%04x" | |
1239 | " app_tag: 0x%04x ref_tag: %u\n", | |
1240 | (unsigned long long)sector, sdt->guard_tag, | |
1241 | sdt->app_tag, be32_to_cpu(sdt->ref_tag)); | |
1242 | ||
1243 | rc = sbc_dif_v1_verify(dev, sdt, daddr + j, sector, | |
1244 | ei_lba); | |
1245 | if (rc) { | |
1246 | kunmap_atomic(paddr); | |
1247 | kunmap_atomic(daddr); | |
76736db3 | 1248 | cmd->bad_sector = sector; |
41861fa8 NB |
1249 | return rc; |
1250 | } | |
1251 | ||
1252 | sector++; | |
1253 | ei_lba++; | |
1254 | offset += sizeof(struct se_dif_v1_tuple); | |
1255 | } | |
1256 | ||
1257 | kunmap_atomic(paddr); | |
1258 | kunmap_atomic(daddr); | |
1259 | } | |
1260 | sbc_dif_copy_prot(cmd, sectors, false, sg, sg_off); | |
1261 | ||
1262 | return 0; | |
1263 | } | |
1264 | EXPORT_SYMBOL(sbc_dif_verify_write); | |
1265 | ||
395ccb25 NB |
1266 | static sense_reason_t |
1267 | __sbc_dif_verify_read(struct se_cmd *cmd, sector_t start, unsigned int sectors, | |
1268 | unsigned int ei_lba, struct scatterlist *sg, int sg_off) | |
41861fa8 NB |
1269 | { |
1270 | struct se_device *dev = cmd->se_dev; | |
1271 | struct se_dif_v1_tuple *sdt; | |
fc272ec7 | 1272 | struct scatterlist *dsg, *psg = sg; |
41861fa8 NB |
1273 | sector_t sector = start; |
1274 | void *daddr, *paddr; | |
1275 | int i, j, offset = sg_off; | |
1276 | sense_reason_t rc; | |
1277 | ||
1278 | for_each_sg(cmd->t_data_sg, dsg, cmd->t_data_nents, i) { | |
1279 | daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; | |
fc272ec7 | 1280 | paddr = kmap_atomic(sg_page(psg)) + sg->offset; |
41861fa8 NB |
1281 | |
1282 | for (j = 0; j < dsg->length; j += dev->dev_attrib.block_size) { | |
1283 | ||
fc272ec7 | 1284 | if (offset >= psg->length) { |
41861fa8 | 1285 | kunmap_atomic(paddr); |
fc272ec7 SG |
1286 | psg = sg_next(psg); |
1287 | paddr = kmap_atomic(sg_page(psg)) + psg->offset; | |
41861fa8 NB |
1288 | offset = 0; |
1289 | } | |
1290 | ||
1291 | sdt = paddr + offset; | |
1292 | ||
1293 | pr_debug("DIF READ sector: %llu guard_tag: 0x%04x" | |
1294 | " app_tag: 0x%04x ref_tag: %u\n", | |
1295 | (unsigned long long)sector, sdt->guard_tag, | |
1296 | sdt->app_tag, be32_to_cpu(sdt->ref_tag)); | |
1297 | ||
1298 | if (sdt->app_tag == cpu_to_be16(0xffff)) { | |
1299 | sector++; | |
1300 | offset += sizeof(struct se_dif_v1_tuple); | |
1301 | continue; | |
1302 | } | |
1303 | ||
1304 | rc = sbc_dif_v1_verify(dev, sdt, daddr + j, sector, | |
1305 | ei_lba); | |
1306 | if (rc) { | |
1307 | kunmap_atomic(paddr); | |
1308 | kunmap_atomic(daddr); | |
76736db3 | 1309 | cmd->bad_sector = sector; |
41861fa8 NB |
1310 | return rc; |
1311 | } | |
1312 | ||
1313 | sector++; | |
1314 | ei_lba++; | |
1315 | offset += sizeof(struct se_dif_v1_tuple); | |
1316 | } | |
1317 | ||
1318 | kunmap_atomic(paddr); | |
1319 | kunmap_atomic(daddr); | |
1320 | } | |
41861fa8 NB |
1321 | |
1322 | return 0; | |
1323 | } | |
395ccb25 NB |
1324 | |
1325 | sense_reason_t | |
1326 | sbc_dif_read_strip(struct se_cmd *cmd) | |
1327 | { | |
1328 | struct se_device *dev = cmd->se_dev; | |
1329 | u32 sectors = cmd->prot_length / dev->prot_length; | |
1330 | ||
1331 | return __sbc_dif_verify_read(cmd, cmd->t_task_lba, sectors, 0, | |
1332 | cmd->t_prot_sg, 0); | |
1333 | } | |
1334 | ||
1335 | sense_reason_t | |
1336 | sbc_dif_verify_read(struct se_cmd *cmd, sector_t start, unsigned int sectors, | |
1337 | unsigned int ei_lba, struct scatterlist *sg, int sg_off) | |
1338 | { | |
1339 | sense_reason_t rc; | |
1340 | ||
1341 | rc = __sbc_dif_verify_read(cmd, start, sectors, ei_lba, sg, sg_off); | |
1342 | if (rc) | |
1343 | return rc; | |
1344 | ||
1345 | sbc_dif_copy_prot(cmd, sectors, true, sg, sg_off); | |
1346 | return 0; | |
1347 | } | |
41861fa8 | 1348 | EXPORT_SYMBOL(sbc_dif_verify_read); |