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Merge tag 'sunxi-fixes-for-3.14' of https://github.com/mripard/linux into fixes
[mirror_ubuntu-zesty-kernel.git] / drivers / target / target_core_spc.c
1 /*
2 * SCSI Primary Commands (SPC) parsing and emulation.
3 *
4 * (c) Copyright 2002-2013 Datera, Inc.
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 <asm/unaligned.h>
26
27 #include <scsi/scsi.h>
28 #include <scsi/scsi_tcq.h>
29
30 #include <target/target_core_base.h>
31 #include <target/target_core_backend.h>
32 #include <target/target_core_fabric.h>
33
34 #include "target_core_internal.h"
35 #include "target_core_alua.h"
36 #include "target_core_pr.h"
37 #include "target_core_ua.h"
38 #include "target_core_xcopy.h"
39
40 static void spc_fill_alua_data(struct se_port *port, unsigned char *buf)
41 {
42 struct t10_alua_tg_pt_gp *tg_pt_gp;
43 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
44
45 /*
46 * Set SCCS for MAINTENANCE_IN + REPORT_TARGET_PORT_GROUPS.
47 */
48 buf[5] = 0x80;
49
50 /*
51 * Set TPGS field for explicit and/or implicit ALUA access type
52 * and opteration.
53 *
54 * See spc4r17 section 6.4.2 Table 135
55 */
56 if (!port)
57 return;
58 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
59 if (!tg_pt_gp_mem)
60 return;
61
62 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
63 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
64 if (tg_pt_gp)
65 buf[5] |= tg_pt_gp->tg_pt_gp_alua_access_type;
66 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
67 }
68
69 sense_reason_t
70 spc_emulate_inquiry_std(struct se_cmd *cmd, unsigned char *buf)
71 {
72 struct se_lun *lun = cmd->se_lun;
73 struct se_device *dev = cmd->se_dev;
74
75 /* Set RMB (removable media) for tape devices */
76 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
77 buf[1] = 0x80;
78
79 buf[2] = 0x05; /* SPC-3 */
80
81 /*
82 * NORMACA and HISUP = 0, RESPONSE DATA FORMAT = 2
83 *
84 * SPC4 says:
85 * A RESPONSE DATA FORMAT field set to 2h indicates that the
86 * standard INQUIRY data is in the format defined in this
87 * standard. Response data format values less than 2h are
88 * obsolete. Response data format values greater than 2h are
89 * reserved.
90 */
91 buf[3] = 2;
92
93 /*
94 * Enable SCCS and TPGS fields for Emulated ALUA
95 */
96 spc_fill_alua_data(lun->lun_sep, buf);
97
98 /*
99 * Set Third-Party Copy (3PC) bit to indicate support for EXTENDED_COPY
100 */
101 if (dev->dev_attrib.emulate_3pc)
102 buf[5] |= 0x8;
103 /*
104 * Set Protection (PROTECT) bit when DIF has been enabled.
105 */
106 if (dev->dev_attrib.pi_prot_type)
107 buf[5] |= 0x1;
108
109 buf[7] = 0x2; /* CmdQue=1 */
110
111 memcpy(&buf[8], "LIO-ORG ", 8);
112 memset(&buf[16], 0x20, 16);
113 memcpy(&buf[16], dev->t10_wwn.model,
114 min_t(size_t, strlen(dev->t10_wwn.model), 16));
115 memcpy(&buf[32], dev->t10_wwn.revision,
116 min_t(size_t, strlen(dev->t10_wwn.revision), 4));
117 buf[4] = 31; /* Set additional length to 31 */
118
119 return 0;
120 }
121 EXPORT_SYMBOL(spc_emulate_inquiry_std);
122
123 /* unit serial number */
124 static sense_reason_t
125 spc_emulate_evpd_80(struct se_cmd *cmd, unsigned char *buf)
126 {
127 struct se_device *dev = cmd->se_dev;
128 u16 len = 0;
129
130 if (dev->dev_flags & DF_EMULATED_VPD_UNIT_SERIAL) {
131 u32 unit_serial_len;
132
133 unit_serial_len = strlen(dev->t10_wwn.unit_serial);
134 unit_serial_len++; /* For NULL Terminator */
135
136 len += sprintf(&buf[4], "%s", dev->t10_wwn.unit_serial);
137 len++; /* Extra Byte for NULL Terminator */
138 buf[3] = len;
139 }
140 return 0;
141 }
142
143 void spc_parse_naa_6h_vendor_specific(struct se_device *dev,
144 unsigned char *buf)
145 {
146 unsigned char *p = &dev->t10_wwn.unit_serial[0];
147 int cnt;
148 bool next = true;
149
150 /*
151 * Generate up to 36 bits of VENDOR SPECIFIC IDENTIFIER starting on
152 * byte 3 bit 3-0 for NAA IEEE Registered Extended DESIGNATOR field
153 * format, followed by 64 bits of VENDOR SPECIFIC IDENTIFIER EXTENSION
154 * to complete the payload. These are based from VPD=0x80 PRODUCT SERIAL
155 * NUMBER set via vpd_unit_serial in target_core_configfs.c to ensure
156 * per device uniqeness.
157 */
158 for (cnt = 0; *p && cnt < 13; p++) {
159 int val = hex_to_bin(*p);
160
161 if (val < 0)
162 continue;
163
164 if (next) {
165 next = false;
166 buf[cnt++] |= val;
167 } else {
168 next = true;
169 buf[cnt] = val << 4;
170 }
171 }
172 }
173
174 /*
175 * Device identification VPD, for a complete list of
176 * DESIGNATOR TYPEs see spc4r17 Table 459.
177 */
178 sense_reason_t
179 spc_emulate_evpd_83(struct se_cmd *cmd, unsigned char *buf)
180 {
181 struct se_device *dev = cmd->se_dev;
182 struct se_lun *lun = cmd->se_lun;
183 struct se_port *port = NULL;
184 struct se_portal_group *tpg = NULL;
185 struct t10_alua_lu_gp_member *lu_gp_mem;
186 struct t10_alua_tg_pt_gp *tg_pt_gp;
187 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
188 unsigned char *prod = &dev->t10_wwn.model[0];
189 u32 prod_len;
190 u32 unit_serial_len, off = 0;
191 u16 len = 0, id_len;
192
193 off = 4;
194
195 /*
196 * NAA IEEE Registered Extended Assigned designator format, see
197 * spc4r17 section 7.7.3.6.5
198 *
199 * We depend upon a target_core_mod/ConfigFS provided
200 * /sys/kernel/config/target/core/$HBA/$DEV/wwn/vpd_unit_serial
201 * value in order to return the NAA id.
202 */
203 if (!(dev->dev_flags & DF_EMULATED_VPD_UNIT_SERIAL))
204 goto check_t10_vend_desc;
205
206 /* CODE SET == Binary */
207 buf[off++] = 0x1;
208
209 /* Set ASSOCIATION == addressed logical unit: 0)b */
210 buf[off] = 0x00;
211
212 /* Identifier/Designator type == NAA identifier */
213 buf[off++] |= 0x3;
214 off++;
215
216 /* Identifier/Designator length */
217 buf[off++] = 0x10;
218
219 /*
220 * Start NAA IEEE Registered Extended Identifier/Designator
221 */
222 buf[off++] = (0x6 << 4);
223
224 /*
225 * Use OpenFabrics IEEE Company ID: 00 14 05
226 */
227 buf[off++] = 0x01;
228 buf[off++] = 0x40;
229 buf[off] = (0x5 << 4);
230
231 /*
232 * Return ConfigFS Unit Serial Number information for
233 * VENDOR_SPECIFIC_IDENTIFIER and
234 * VENDOR_SPECIFIC_IDENTIFIER_EXTENTION
235 */
236 spc_parse_naa_6h_vendor_specific(dev, &buf[off]);
237
238 len = 20;
239 off = (len + 4);
240
241 check_t10_vend_desc:
242 /*
243 * T10 Vendor Identifier Page, see spc4r17 section 7.7.3.4
244 */
245 id_len = 8; /* For Vendor field */
246 prod_len = 4; /* For VPD Header */
247 prod_len += 8; /* For Vendor field */
248 prod_len += strlen(prod);
249 prod_len++; /* For : */
250
251 if (dev->dev_flags & DF_EMULATED_VPD_UNIT_SERIAL) {
252 unit_serial_len = strlen(&dev->t10_wwn.unit_serial[0]);
253 unit_serial_len++; /* For NULL Terminator */
254
255 id_len += sprintf(&buf[off+12], "%s:%s", prod,
256 &dev->t10_wwn.unit_serial[0]);
257 }
258 buf[off] = 0x2; /* ASCII */
259 buf[off+1] = 0x1; /* T10 Vendor ID */
260 buf[off+2] = 0x0;
261 memcpy(&buf[off+4], "LIO-ORG", 8);
262 /* Extra Byte for NULL Terminator */
263 id_len++;
264 /* Identifier Length */
265 buf[off+3] = id_len;
266 /* Header size for Designation descriptor */
267 len += (id_len + 4);
268 off += (id_len + 4);
269 /*
270 * struct se_port is only set for INQUIRY VPD=1 through $FABRIC_MOD
271 */
272 port = lun->lun_sep;
273 if (port) {
274 struct t10_alua_lu_gp *lu_gp;
275 u32 padding, scsi_name_len, scsi_target_len;
276 u16 lu_gp_id = 0;
277 u16 tg_pt_gp_id = 0;
278 u16 tpgt;
279
280 tpg = port->sep_tpg;
281 /*
282 * Relative target port identifer, see spc4r17
283 * section 7.7.3.7
284 *
285 * Get the PROTOCOL IDENTIFIER as defined by spc4r17
286 * section 7.5.1 Table 362
287 */
288 buf[off] =
289 (tpg->se_tpg_tfo->get_fabric_proto_ident(tpg) << 4);
290 buf[off++] |= 0x1; /* CODE SET == Binary */
291 buf[off] = 0x80; /* Set PIV=1 */
292 /* Set ASSOCIATION == target port: 01b */
293 buf[off] |= 0x10;
294 /* DESIGNATOR TYPE == Relative target port identifer */
295 buf[off++] |= 0x4;
296 off++; /* Skip over Reserved */
297 buf[off++] = 4; /* DESIGNATOR LENGTH */
298 /* Skip over Obsolete field in RTPI payload
299 * in Table 472 */
300 off += 2;
301 buf[off++] = ((port->sep_rtpi >> 8) & 0xff);
302 buf[off++] = (port->sep_rtpi & 0xff);
303 len += 8; /* Header size + Designation descriptor */
304 /*
305 * Target port group identifier, see spc4r17
306 * section 7.7.3.8
307 *
308 * Get the PROTOCOL IDENTIFIER as defined by spc4r17
309 * section 7.5.1 Table 362
310 */
311 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
312 if (!tg_pt_gp_mem)
313 goto check_lu_gp;
314
315 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
316 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
317 if (!tg_pt_gp) {
318 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
319 goto check_lu_gp;
320 }
321 tg_pt_gp_id = tg_pt_gp->tg_pt_gp_id;
322 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
323
324 buf[off] =
325 (tpg->se_tpg_tfo->get_fabric_proto_ident(tpg) << 4);
326 buf[off++] |= 0x1; /* CODE SET == Binary */
327 buf[off] = 0x80; /* Set PIV=1 */
328 /* Set ASSOCIATION == target port: 01b */
329 buf[off] |= 0x10;
330 /* DESIGNATOR TYPE == Target port group identifier */
331 buf[off++] |= 0x5;
332 off++; /* Skip over Reserved */
333 buf[off++] = 4; /* DESIGNATOR LENGTH */
334 off += 2; /* Skip over Reserved Field */
335 buf[off++] = ((tg_pt_gp_id >> 8) & 0xff);
336 buf[off++] = (tg_pt_gp_id & 0xff);
337 len += 8; /* Header size + Designation descriptor */
338 /*
339 * Logical Unit Group identifier, see spc4r17
340 * section 7.7.3.8
341 */
342 check_lu_gp:
343 lu_gp_mem = dev->dev_alua_lu_gp_mem;
344 if (!lu_gp_mem)
345 goto check_scsi_name;
346
347 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
348 lu_gp = lu_gp_mem->lu_gp;
349 if (!lu_gp) {
350 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
351 goto check_scsi_name;
352 }
353 lu_gp_id = lu_gp->lu_gp_id;
354 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
355
356 buf[off++] |= 0x1; /* CODE SET == Binary */
357 /* DESIGNATOR TYPE == Logical Unit Group identifier */
358 buf[off++] |= 0x6;
359 off++; /* Skip over Reserved */
360 buf[off++] = 4; /* DESIGNATOR LENGTH */
361 off += 2; /* Skip over Reserved Field */
362 buf[off++] = ((lu_gp_id >> 8) & 0xff);
363 buf[off++] = (lu_gp_id & 0xff);
364 len += 8; /* Header size + Designation descriptor */
365 /*
366 * SCSI name string designator, see spc4r17
367 * section 7.7.3.11
368 *
369 * Get the PROTOCOL IDENTIFIER as defined by spc4r17
370 * section 7.5.1 Table 362
371 */
372 check_scsi_name:
373 buf[off] =
374 (tpg->se_tpg_tfo->get_fabric_proto_ident(tpg) << 4);
375 buf[off++] |= 0x3; /* CODE SET == UTF-8 */
376 buf[off] = 0x80; /* Set PIV=1 */
377 /* Set ASSOCIATION == target port: 01b */
378 buf[off] |= 0x10;
379 /* DESIGNATOR TYPE == SCSI name string */
380 buf[off++] |= 0x8;
381 off += 2; /* Skip over Reserved and length */
382 /*
383 * SCSI name string identifer containing, $FABRIC_MOD
384 * dependent information. For LIO-Target and iSCSI
385 * Target Port, this means "<iSCSI name>,t,0x<TPGT> in
386 * UTF-8 encoding.
387 */
388 tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg);
389 scsi_name_len = sprintf(&buf[off], "%s,t,0x%04x",
390 tpg->se_tpg_tfo->tpg_get_wwn(tpg), tpgt);
391 scsi_name_len += 1 /* Include NULL terminator */;
392 /*
393 * The null-terminated, null-padded (see 4.4.2) SCSI
394 * NAME STRING field contains a UTF-8 format string.
395 * The number of bytes in the SCSI NAME STRING field
396 * (i.e., the value in the DESIGNATOR LENGTH field)
397 * shall be no larger than 256 and shall be a multiple
398 * of four.
399 */
400 padding = ((-scsi_name_len) & 3);
401 if (padding)
402 scsi_name_len += padding;
403 if (scsi_name_len > 256)
404 scsi_name_len = 256;
405
406 buf[off-1] = scsi_name_len;
407 off += scsi_name_len;
408 /* Header size + Designation descriptor */
409 len += (scsi_name_len + 4);
410
411 /*
412 * Target device designator
413 */
414 buf[off] =
415 (tpg->se_tpg_tfo->get_fabric_proto_ident(tpg) << 4);
416 buf[off++] |= 0x3; /* CODE SET == UTF-8 */
417 buf[off] = 0x80; /* Set PIV=1 */
418 /* Set ASSOCIATION == target device: 10b */
419 buf[off] |= 0x20;
420 /* DESIGNATOR TYPE == SCSI name string */
421 buf[off++] |= 0x8;
422 off += 2; /* Skip over Reserved and length */
423 /*
424 * SCSI name string identifer containing, $FABRIC_MOD
425 * dependent information. For LIO-Target and iSCSI
426 * Target Port, this means "<iSCSI name>" in
427 * UTF-8 encoding.
428 */
429 scsi_target_len = sprintf(&buf[off], "%s",
430 tpg->se_tpg_tfo->tpg_get_wwn(tpg));
431 scsi_target_len += 1 /* Include NULL terminator */;
432 /*
433 * The null-terminated, null-padded (see 4.4.2) SCSI
434 * NAME STRING field contains a UTF-8 format string.
435 * The number of bytes in the SCSI NAME STRING field
436 * (i.e., the value in the DESIGNATOR LENGTH field)
437 * shall be no larger than 256 and shall be a multiple
438 * of four.
439 */
440 padding = ((-scsi_target_len) & 3);
441 if (padding)
442 scsi_target_len += padding;
443 if (scsi_target_len > 256)
444 scsi_target_len = 256;
445
446 buf[off-1] = scsi_target_len;
447 off += scsi_target_len;
448
449 /* Header size + Designation descriptor */
450 len += (scsi_target_len + 4);
451 }
452 buf[2] = ((len >> 8) & 0xff);
453 buf[3] = (len & 0xff); /* Page Length for VPD 0x83 */
454 return 0;
455 }
456 EXPORT_SYMBOL(spc_emulate_evpd_83);
457
458 static bool
459 spc_check_dev_wce(struct se_device *dev)
460 {
461 bool wce = false;
462
463 if (dev->transport->get_write_cache)
464 wce = dev->transport->get_write_cache(dev);
465 else if (dev->dev_attrib.emulate_write_cache > 0)
466 wce = true;
467
468 return wce;
469 }
470
471 /* Extended INQUIRY Data VPD Page */
472 static sense_reason_t
473 spc_emulate_evpd_86(struct se_cmd *cmd, unsigned char *buf)
474 {
475 struct se_device *dev = cmd->se_dev;
476
477 buf[3] = 0x3c;
478 /*
479 * Set GRD_CHK + REF_CHK for TYPE1 protection, or GRD_CHK
480 * only for TYPE3 protection.
481 */
482 if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE1_PROT)
483 buf[4] = 0x5;
484 else if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE3_PROT)
485 buf[4] = 0x4;
486
487 /* Set HEADSUP, ORDSUP, SIMPSUP */
488 buf[5] = 0x07;
489
490 /* If WriteCache emulation is enabled, set V_SUP */
491 if (spc_check_dev_wce(dev))
492 buf[6] = 0x01;
493 /* If an LBA map is present set R_SUP */
494 spin_lock(&cmd->se_dev->t10_alua.lba_map_lock);
495 if (!list_empty(&dev->t10_alua.lba_map_list))
496 buf[8] = 0x10;
497 spin_unlock(&cmd->se_dev->t10_alua.lba_map_lock);
498 return 0;
499 }
500
501 /* Block Limits VPD page */
502 static sense_reason_t
503 spc_emulate_evpd_b0(struct se_cmd *cmd, unsigned char *buf)
504 {
505 struct se_device *dev = cmd->se_dev;
506 u32 max_sectors;
507 int have_tp = 0;
508 int opt, min;
509
510 /*
511 * Following spc3r22 section 6.5.3 Block Limits VPD page, when
512 * emulate_tpu=1 or emulate_tpws=1 we will be expect a
513 * different page length for Thin Provisioning.
514 */
515 if (dev->dev_attrib.emulate_tpu || dev->dev_attrib.emulate_tpws)
516 have_tp = 1;
517
518 buf[0] = dev->transport->get_device_type(dev);
519 buf[3] = have_tp ? 0x3c : 0x10;
520
521 /* Set WSNZ to 1 */
522 buf[4] = 0x01;
523 /*
524 * Set MAXIMUM COMPARE AND WRITE LENGTH
525 */
526 if (dev->dev_attrib.emulate_caw)
527 buf[5] = 0x01;
528
529 /*
530 * Set OPTIMAL TRANSFER LENGTH GRANULARITY
531 */
532 if (dev->transport->get_io_min && (min = dev->transport->get_io_min(dev)))
533 put_unaligned_be16(min / dev->dev_attrib.block_size, &buf[6]);
534 else
535 put_unaligned_be16(1, &buf[6]);
536
537 /*
538 * Set MAXIMUM TRANSFER LENGTH
539 */
540 max_sectors = min(dev->dev_attrib.fabric_max_sectors,
541 dev->dev_attrib.hw_max_sectors);
542 put_unaligned_be32(max_sectors, &buf[8]);
543
544 /*
545 * Set OPTIMAL TRANSFER LENGTH
546 */
547 if (dev->transport->get_io_opt && (opt = dev->transport->get_io_opt(dev)))
548 put_unaligned_be32(opt / dev->dev_attrib.block_size, &buf[12]);
549 else
550 put_unaligned_be32(dev->dev_attrib.optimal_sectors, &buf[12]);
551
552 /*
553 * Exit now if we don't support TP.
554 */
555 if (!have_tp)
556 goto max_write_same;
557
558 /*
559 * Set MAXIMUM UNMAP LBA COUNT
560 */
561 put_unaligned_be32(dev->dev_attrib.max_unmap_lba_count, &buf[20]);
562
563 /*
564 * Set MAXIMUM UNMAP BLOCK DESCRIPTOR COUNT
565 */
566 put_unaligned_be32(dev->dev_attrib.max_unmap_block_desc_count,
567 &buf[24]);
568
569 /*
570 * Set OPTIMAL UNMAP GRANULARITY
571 */
572 put_unaligned_be32(dev->dev_attrib.unmap_granularity, &buf[28]);
573
574 /*
575 * UNMAP GRANULARITY ALIGNMENT
576 */
577 put_unaligned_be32(dev->dev_attrib.unmap_granularity_alignment,
578 &buf[32]);
579 if (dev->dev_attrib.unmap_granularity_alignment != 0)
580 buf[32] |= 0x80; /* Set the UGAVALID bit */
581
582 /*
583 * MAXIMUM WRITE SAME LENGTH
584 */
585 max_write_same:
586 put_unaligned_be64(dev->dev_attrib.max_write_same_len, &buf[36]);
587
588 return 0;
589 }
590
591 /* Block Device Characteristics VPD page */
592 static sense_reason_t
593 spc_emulate_evpd_b1(struct se_cmd *cmd, unsigned char *buf)
594 {
595 struct se_device *dev = cmd->se_dev;
596
597 buf[0] = dev->transport->get_device_type(dev);
598 buf[3] = 0x3c;
599 buf[5] = dev->dev_attrib.is_nonrot ? 1 : 0;
600
601 return 0;
602 }
603
604 /* Thin Provisioning VPD */
605 static sense_reason_t
606 spc_emulate_evpd_b2(struct se_cmd *cmd, unsigned char *buf)
607 {
608 struct se_device *dev = cmd->se_dev;
609
610 /*
611 * From spc3r22 section 6.5.4 Thin Provisioning VPD page:
612 *
613 * The PAGE LENGTH field is defined in SPC-4. If the DP bit is set to
614 * zero, then the page length shall be set to 0004h. If the DP bit
615 * is set to one, then the page length shall be set to the value
616 * defined in table 162.
617 */
618 buf[0] = dev->transport->get_device_type(dev);
619
620 /*
621 * Set Hardcoded length mentioned above for DP=0
622 */
623 put_unaligned_be16(0x0004, &buf[2]);
624
625 /*
626 * The THRESHOLD EXPONENT field indicates the threshold set size in
627 * LBAs as a power of 2 (i.e., the threshold set size is equal to
628 * 2(threshold exponent)).
629 *
630 * Note that this is currently set to 0x00 as mkp says it will be
631 * changing again. We can enable this once it has settled in T10
632 * and is actually used by Linux/SCSI ML code.
633 */
634 buf[4] = 0x00;
635
636 /*
637 * A TPU bit set to one indicates that the device server supports
638 * the UNMAP command (see 5.25). A TPU bit set to zero indicates
639 * that the device server does not support the UNMAP command.
640 */
641 if (dev->dev_attrib.emulate_tpu != 0)
642 buf[5] = 0x80;
643
644 /*
645 * A TPWS bit set to one indicates that the device server supports
646 * the use of the WRITE SAME (16) command (see 5.42) to unmap LBAs.
647 * A TPWS bit set to zero indicates that the device server does not
648 * support the use of the WRITE SAME (16) command to unmap LBAs.
649 */
650 if (dev->dev_attrib.emulate_tpws != 0)
651 buf[5] |= 0x40;
652
653 return 0;
654 }
655
656 /* Referrals VPD page */
657 static sense_reason_t
658 spc_emulate_evpd_b3(struct se_cmd *cmd, unsigned char *buf)
659 {
660 struct se_device *dev = cmd->se_dev;
661
662 buf[0] = dev->transport->get_device_type(dev);
663 buf[3] = 0x0c;
664 put_unaligned_be32(dev->t10_alua.lba_map_segment_size, &buf[8]);
665 put_unaligned_be32(dev->t10_alua.lba_map_segment_size, &buf[12]);
666
667 return 0;
668 }
669
670 static sense_reason_t
671 spc_emulate_evpd_00(struct se_cmd *cmd, unsigned char *buf);
672
673 static struct {
674 uint8_t page;
675 sense_reason_t (*emulate)(struct se_cmd *, unsigned char *);
676 } evpd_handlers[] = {
677 { .page = 0x00, .emulate = spc_emulate_evpd_00 },
678 { .page = 0x80, .emulate = spc_emulate_evpd_80 },
679 { .page = 0x83, .emulate = spc_emulate_evpd_83 },
680 { .page = 0x86, .emulate = spc_emulate_evpd_86 },
681 { .page = 0xb0, .emulate = spc_emulate_evpd_b0 },
682 { .page = 0xb1, .emulate = spc_emulate_evpd_b1 },
683 { .page = 0xb2, .emulate = spc_emulate_evpd_b2 },
684 { .page = 0xb3, .emulate = spc_emulate_evpd_b3 },
685 };
686
687 /* supported vital product data pages */
688 static sense_reason_t
689 spc_emulate_evpd_00(struct se_cmd *cmd, unsigned char *buf)
690 {
691 int p;
692
693 /*
694 * Only report the INQUIRY EVPD=1 pages after a valid NAA
695 * Registered Extended LUN WWN has been set via ConfigFS
696 * during device creation/restart.
697 */
698 if (cmd->se_dev->dev_flags & DF_EMULATED_VPD_UNIT_SERIAL) {
699 buf[3] = ARRAY_SIZE(evpd_handlers);
700 for (p = 0; p < ARRAY_SIZE(evpd_handlers); ++p)
701 buf[p + 4] = evpd_handlers[p].page;
702 }
703
704 return 0;
705 }
706
707 static sense_reason_t
708 spc_emulate_inquiry(struct se_cmd *cmd)
709 {
710 struct se_device *dev = cmd->se_dev;
711 struct se_portal_group *tpg = cmd->se_lun->lun_sep->sep_tpg;
712 unsigned char *rbuf;
713 unsigned char *cdb = cmd->t_task_cdb;
714 unsigned char *buf;
715 sense_reason_t ret;
716 int p;
717
718 buf = kzalloc(SE_INQUIRY_BUF, GFP_KERNEL);
719 if (!buf) {
720 pr_err("Unable to allocate response buffer for INQUIRY\n");
721 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
722 }
723
724 if (dev == tpg->tpg_virt_lun0.lun_se_dev)
725 buf[0] = 0x3f; /* Not connected */
726 else
727 buf[0] = dev->transport->get_device_type(dev);
728
729 if (!(cdb[1] & 0x1)) {
730 if (cdb[2]) {
731 pr_err("INQUIRY with EVPD==0 but PAGE CODE=%02x\n",
732 cdb[2]);
733 ret = TCM_INVALID_CDB_FIELD;
734 goto out;
735 }
736
737 ret = spc_emulate_inquiry_std(cmd, buf);
738 goto out;
739 }
740
741 for (p = 0; p < ARRAY_SIZE(evpd_handlers); ++p) {
742 if (cdb[2] == evpd_handlers[p].page) {
743 buf[1] = cdb[2];
744 ret = evpd_handlers[p].emulate(cmd, buf);
745 goto out;
746 }
747 }
748
749 pr_err("Unknown VPD Code: 0x%02x\n", cdb[2]);
750 ret = TCM_INVALID_CDB_FIELD;
751
752 out:
753 rbuf = transport_kmap_data_sg(cmd);
754 if (rbuf) {
755 memcpy(rbuf, buf, min_t(u32, SE_INQUIRY_BUF, cmd->data_length));
756 transport_kunmap_data_sg(cmd);
757 }
758 kfree(buf);
759
760 if (!ret)
761 target_complete_cmd(cmd, GOOD);
762 return ret;
763 }
764
765 static int spc_modesense_rwrecovery(struct se_device *dev, u8 pc, u8 *p)
766 {
767 p[0] = 0x01;
768 p[1] = 0x0a;
769
770 /* No changeable values for now */
771 if (pc == 1)
772 goto out;
773
774 out:
775 return 12;
776 }
777
778 static int spc_modesense_control(struct se_device *dev, u8 pc, u8 *p)
779 {
780 p[0] = 0x0a;
781 p[1] = 0x0a;
782
783 /* No changeable values for now */
784 if (pc == 1)
785 goto out;
786
787 p[2] = 2;
788 /*
789 * From spc4r23, 7.4.7 Control mode page
790 *
791 * The QUEUE ALGORITHM MODIFIER field (see table 368) specifies
792 * restrictions on the algorithm used for reordering commands
793 * having the SIMPLE task attribute (see SAM-4).
794 *
795 * Table 368 -- QUEUE ALGORITHM MODIFIER field
796 * Code Description
797 * 0h Restricted reordering
798 * 1h Unrestricted reordering allowed
799 * 2h to 7h Reserved
800 * 8h to Fh Vendor specific
801 *
802 * A value of zero in the QUEUE ALGORITHM MODIFIER field specifies that
803 * the device server shall order the processing sequence of commands
804 * having the SIMPLE task attribute such that data integrity is maintained
805 * for that I_T nexus (i.e., if the transmission of new SCSI transport protocol
806 * requests is halted at any time, the final value of all data observable
807 * on the medium shall be the same as if all the commands had been processed
808 * with the ORDERED task attribute).
809 *
810 * A value of one in the QUEUE ALGORITHM MODIFIER field specifies that the
811 * device server may reorder the processing sequence of commands having the
812 * SIMPLE task attribute in any manner. Any data integrity exposures related to
813 * command sequence order shall be explicitly handled by the application client
814 * through the selection of appropriate ommands and task attributes.
815 */
816 p[3] = (dev->dev_attrib.emulate_rest_reord == 1) ? 0x00 : 0x10;
817 /*
818 * From spc4r17, section 7.4.6 Control mode Page
819 *
820 * Unit Attention interlocks control (UN_INTLCK_CTRL) to code 00b
821 *
822 * 00b: The logical unit shall clear any unit attention condition
823 * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION
824 * status and shall not establish a unit attention condition when a com-
825 * mand is completed with BUSY, TASK SET FULL, or RESERVATION CONFLICT
826 * status.
827 *
828 * 10b: The logical unit shall not clear any unit attention condition
829 * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION
830 * status and shall not establish a unit attention condition when
831 * a command is completed with BUSY, TASK SET FULL, or RESERVATION
832 * CONFLICT status.
833 *
834 * 11b a The logical unit shall not clear any unit attention condition
835 * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION
836 * status and shall establish a unit attention condition for the
837 * initiator port associated with the I_T nexus on which the BUSY,
838 * TASK SET FULL, or RESERVATION CONFLICT status is being returned.
839 * Depending on the status, the additional sense code shall be set to
840 * PREVIOUS BUSY STATUS, PREVIOUS TASK SET FULL STATUS, or PREVIOUS
841 * RESERVATION CONFLICT STATUS. Until it is cleared by a REQUEST SENSE
842 * command, a unit attention condition shall be established only once
843 * for a BUSY, TASK SET FULL, or RESERVATION CONFLICT status regardless
844 * to the number of commands completed with one of those status codes.
845 */
846 p[4] = (dev->dev_attrib.emulate_ua_intlck_ctrl == 2) ? 0x30 :
847 (dev->dev_attrib.emulate_ua_intlck_ctrl == 1) ? 0x20 : 0x00;
848 /*
849 * From spc4r17, section 7.4.6 Control mode Page
850 *
851 * Task Aborted Status (TAS) bit set to zero.
852 *
853 * A task aborted status (TAS) bit set to zero specifies that aborted
854 * tasks shall be terminated by the device server without any response
855 * to the application client. A TAS bit set to one specifies that tasks
856 * aborted by the actions of an I_T nexus other than the I_T nexus on
857 * which the command was received shall be completed with TASK ABORTED
858 * status (see SAM-4).
859 */
860 p[5] = (dev->dev_attrib.emulate_tas) ? 0x40 : 0x00;
861 /*
862 * From spc4r30, section 7.5.7 Control mode page
863 *
864 * Application Tag Owner (ATO) bit set to one.
865 *
866 * If the ATO bit is set to one the device server shall not modify the
867 * LOGICAL BLOCK APPLICATION TAG field and, depending on the protection
868 * type, shall not modify the contents of the LOGICAL BLOCK REFERENCE
869 * TAG field.
870 */
871 if (dev->dev_attrib.pi_prot_type)
872 p[5] |= 0x80;
873
874 p[8] = 0xff;
875 p[9] = 0xff;
876 p[11] = 30;
877
878 out:
879 return 12;
880 }
881
882 static int spc_modesense_caching(struct se_device *dev, u8 pc, u8 *p)
883 {
884 p[0] = 0x08;
885 p[1] = 0x12;
886
887 /* No changeable values for now */
888 if (pc == 1)
889 goto out;
890
891 if (spc_check_dev_wce(dev))
892 p[2] = 0x04; /* Write Cache Enable */
893 p[12] = 0x20; /* Disabled Read Ahead */
894
895 out:
896 return 20;
897 }
898
899 static int spc_modesense_informational_exceptions(struct se_device *dev, u8 pc, unsigned char *p)
900 {
901 p[0] = 0x1c;
902 p[1] = 0x0a;
903
904 /* No changeable values for now */
905 if (pc == 1)
906 goto out;
907
908 out:
909 return 12;
910 }
911
912 static struct {
913 uint8_t page;
914 uint8_t subpage;
915 int (*emulate)(struct se_device *, u8, unsigned char *);
916 } modesense_handlers[] = {
917 { .page = 0x01, .subpage = 0x00, .emulate = spc_modesense_rwrecovery },
918 { .page = 0x08, .subpage = 0x00, .emulate = spc_modesense_caching },
919 { .page = 0x0a, .subpage = 0x00, .emulate = spc_modesense_control },
920 { .page = 0x1c, .subpage = 0x00, .emulate = spc_modesense_informational_exceptions },
921 };
922
923 static void spc_modesense_write_protect(unsigned char *buf, int type)
924 {
925 /*
926 * I believe that the WP bit (bit 7) in the mode header is the same for
927 * all device types..
928 */
929 switch (type) {
930 case TYPE_DISK:
931 case TYPE_TAPE:
932 default:
933 buf[0] |= 0x80; /* WP bit */
934 break;
935 }
936 }
937
938 static void spc_modesense_dpofua(unsigned char *buf, int type)
939 {
940 switch (type) {
941 case TYPE_DISK:
942 buf[0] |= 0x10; /* DPOFUA bit */
943 break;
944 default:
945 break;
946 }
947 }
948
949 static int spc_modesense_blockdesc(unsigned char *buf, u64 blocks, u32 block_size)
950 {
951 *buf++ = 8;
952 put_unaligned_be32(min(blocks, 0xffffffffull), buf);
953 buf += 4;
954 put_unaligned_be32(block_size, buf);
955 return 9;
956 }
957
958 static int spc_modesense_long_blockdesc(unsigned char *buf, u64 blocks, u32 block_size)
959 {
960 if (blocks <= 0xffffffff)
961 return spc_modesense_blockdesc(buf + 3, blocks, block_size) + 3;
962
963 *buf++ = 1; /* LONGLBA */
964 buf += 2;
965 *buf++ = 16;
966 put_unaligned_be64(blocks, buf);
967 buf += 12;
968 put_unaligned_be32(block_size, buf);
969
970 return 17;
971 }
972
973 static sense_reason_t spc_emulate_modesense(struct se_cmd *cmd)
974 {
975 struct se_device *dev = cmd->se_dev;
976 char *cdb = cmd->t_task_cdb;
977 unsigned char buf[SE_MODE_PAGE_BUF], *rbuf;
978 int type = dev->transport->get_device_type(dev);
979 int ten = (cmd->t_task_cdb[0] == MODE_SENSE_10);
980 bool dbd = !!(cdb[1] & 0x08);
981 bool llba = ten ? !!(cdb[1] & 0x10) : false;
982 u8 pc = cdb[2] >> 6;
983 u8 page = cdb[2] & 0x3f;
984 u8 subpage = cdb[3];
985 int length = 0;
986 int ret;
987 int i;
988
989 memset(buf, 0, SE_MODE_PAGE_BUF);
990
991 /*
992 * Skip over MODE DATA LENGTH + MEDIUM TYPE fields to byte 3 for
993 * MODE_SENSE_10 and byte 2 for MODE_SENSE (6).
994 */
995 length = ten ? 3 : 2;
996
997 /* DEVICE-SPECIFIC PARAMETER */
998 if ((cmd->se_lun->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY) ||
999 (cmd->se_deve &&
1000 (cmd->se_deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY)))
1001 spc_modesense_write_protect(&buf[length], type);
1002
1003 if ((spc_check_dev_wce(dev)) &&
1004 (dev->dev_attrib.emulate_fua_write > 0))
1005 spc_modesense_dpofua(&buf[length], type);
1006
1007 ++length;
1008
1009 /* BLOCK DESCRIPTOR */
1010
1011 /*
1012 * For now we only include a block descriptor for disk (SBC)
1013 * devices; other command sets use a slightly different format.
1014 */
1015 if (!dbd && type == TYPE_DISK) {
1016 u64 blocks = dev->transport->get_blocks(dev);
1017 u32 block_size = dev->dev_attrib.block_size;
1018
1019 if (ten) {
1020 if (llba) {
1021 length += spc_modesense_long_blockdesc(&buf[length],
1022 blocks, block_size);
1023 } else {
1024 length += 3;
1025 length += spc_modesense_blockdesc(&buf[length],
1026 blocks, block_size);
1027 }
1028 } else {
1029 length += spc_modesense_blockdesc(&buf[length], blocks,
1030 block_size);
1031 }
1032 } else {
1033 if (ten)
1034 length += 4;
1035 else
1036 length += 1;
1037 }
1038
1039 if (page == 0x3f) {
1040 if (subpage != 0x00 && subpage != 0xff) {
1041 pr_warn("MODE_SENSE: Invalid subpage code: 0x%02x\n", subpage);
1042 return TCM_INVALID_CDB_FIELD;
1043 }
1044
1045 for (i = 0; i < ARRAY_SIZE(modesense_handlers); ++i) {
1046 /*
1047 * Tricky way to say all subpage 00h for
1048 * subpage==0, all subpages for subpage==0xff
1049 * (and we just checked above that those are
1050 * the only two possibilities).
1051 */
1052 if ((modesense_handlers[i].subpage & ~subpage) == 0) {
1053 ret = modesense_handlers[i].emulate(dev, pc, &buf[length]);
1054 if (!ten && length + ret >= 255)
1055 break;
1056 length += ret;
1057 }
1058 }
1059
1060 goto set_length;
1061 }
1062
1063 for (i = 0; i < ARRAY_SIZE(modesense_handlers); ++i)
1064 if (modesense_handlers[i].page == page &&
1065 modesense_handlers[i].subpage == subpage) {
1066 length += modesense_handlers[i].emulate(dev, pc, &buf[length]);
1067 goto set_length;
1068 }
1069
1070 /*
1071 * We don't intend to implement:
1072 * - obsolete page 03h "format parameters" (checked by Solaris)
1073 */
1074 if (page != 0x03)
1075 pr_err("MODE SENSE: unimplemented page/subpage: 0x%02x/0x%02x\n",
1076 page, subpage);
1077
1078 return TCM_UNKNOWN_MODE_PAGE;
1079
1080 set_length:
1081 if (ten)
1082 put_unaligned_be16(length - 2, buf);
1083 else
1084 buf[0] = length - 1;
1085
1086 rbuf = transport_kmap_data_sg(cmd);
1087 if (rbuf) {
1088 memcpy(rbuf, buf, min_t(u32, SE_MODE_PAGE_BUF, cmd->data_length));
1089 transport_kunmap_data_sg(cmd);
1090 }
1091
1092 target_complete_cmd(cmd, GOOD);
1093 return 0;
1094 }
1095
1096 static sense_reason_t spc_emulate_modeselect(struct se_cmd *cmd)
1097 {
1098 struct se_device *dev = cmd->se_dev;
1099 char *cdb = cmd->t_task_cdb;
1100 bool ten = cdb[0] == MODE_SELECT_10;
1101 int off = ten ? 8 : 4;
1102 bool pf = !!(cdb[1] & 0x10);
1103 u8 page, subpage;
1104 unsigned char *buf;
1105 unsigned char tbuf[SE_MODE_PAGE_BUF];
1106 int length;
1107 int ret = 0;
1108 int i;
1109
1110 if (!cmd->data_length) {
1111 target_complete_cmd(cmd, GOOD);
1112 return 0;
1113 }
1114
1115 if (cmd->data_length < off + 2)
1116 return TCM_PARAMETER_LIST_LENGTH_ERROR;
1117
1118 buf = transport_kmap_data_sg(cmd);
1119 if (!buf)
1120 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1121
1122 if (!pf) {
1123 ret = TCM_INVALID_CDB_FIELD;
1124 goto out;
1125 }
1126
1127 page = buf[off] & 0x3f;
1128 subpage = buf[off] & 0x40 ? buf[off + 1] : 0;
1129
1130 for (i = 0; i < ARRAY_SIZE(modesense_handlers); ++i)
1131 if (modesense_handlers[i].page == page &&
1132 modesense_handlers[i].subpage == subpage) {
1133 memset(tbuf, 0, SE_MODE_PAGE_BUF);
1134 length = modesense_handlers[i].emulate(dev, 0, tbuf);
1135 goto check_contents;
1136 }
1137
1138 ret = TCM_UNKNOWN_MODE_PAGE;
1139 goto out;
1140
1141 check_contents:
1142 if (cmd->data_length < off + length) {
1143 ret = TCM_PARAMETER_LIST_LENGTH_ERROR;
1144 goto out;
1145 }
1146
1147 if (memcmp(buf + off, tbuf, length))
1148 ret = TCM_INVALID_PARAMETER_LIST;
1149
1150 out:
1151 transport_kunmap_data_sg(cmd);
1152
1153 if (!ret)
1154 target_complete_cmd(cmd, GOOD);
1155 return ret;
1156 }
1157
1158 static sense_reason_t spc_emulate_request_sense(struct se_cmd *cmd)
1159 {
1160 unsigned char *cdb = cmd->t_task_cdb;
1161 unsigned char *rbuf;
1162 u8 ua_asc = 0, ua_ascq = 0;
1163 unsigned char buf[SE_SENSE_BUF];
1164
1165 memset(buf, 0, SE_SENSE_BUF);
1166
1167 if (cdb[1] & 0x01) {
1168 pr_err("REQUEST_SENSE description emulation not"
1169 " supported\n");
1170 return TCM_INVALID_CDB_FIELD;
1171 }
1172
1173 rbuf = transport_kmap_data_sg(cmd);
1174 if (!rbuf)
1175 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1176
1177 if (!core_scsi3_ua_clear_for_request_sense(cmd, &ua_asc, &ua_ascq)) {
1178 /*
1179 * CURRENT ERROR, UNIT ATTENTION
1180 */
1181 buf[0] = 0x70;
1182 buf[SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
1183
1184 /*
1185 * The Additional Sense Code (ASC) from the UNIT ATTENTION
1186 */
1187 buf[SPC_ASC_KEY_OFFSET] = ua_asc;
1188 buf[SPC_ASCQ_KEY_OFFSET] = ua_ascq;
1189 buf[7] = 0x0A;
1190 } else {
1191 /*
1192 * CURRENT ERROR, NO SENSE
1193 */
1194 buf[0] = 0x70;
1195 buf[SPC_SENSE_KEY_OFFSET] = NO_SENSE;
1196
1197 /*
1198 * NO ADDITIONAL SENSE INFORMATION
1199 */
1200 buf[SPC_ASC_KEY_OFFSET] = 0x00;
1201 buf[7] = 0x0A;
1202 }
1203
1204 memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length));
1205 transport_kunmap_data_sg(cmd);
1206
1207 target_complete_cmd(cmd, GOOD);
1208 return 0;
1209 }
1210
1211 sense_reason_t spc_emulate_report_luns(struct se_cmd *cmd)
1212 {
1213 struct se_dev_entry *deve;
1214 struct se_session *sess = cmd->se_sess;
1215 unsigned char *buf;
1216 u32 lun_count = 0, offset = 8, i;
1217
1218 if (cmd->data_length < 16) {
1219 pr_warn("REPORT LUNS allocation length %u too small\n",
1220 cmd->data_length);
1221 return TCM_INVALID_CDB_FIELD;
1222 }
1223
1224 buf = transport_kmap_data_sg(cmd);
1225 if (!buf)
1226 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1227
1228 /*
1229 * If no struct se_session pointer is present, this struct se_cmd is
1230 * coming via a target_core_mod PASSTHROUGH op, and not through
1231 * a $FABRIC_MOD. In that case, report LUN=0 only.
1232 */
1233 if (!sess) {
1234 int_to_scsilun(0, (struct scsi_lun *)&buf[offset]);
1235 lun_count = 1;
1236 goto done;
1237 }
1238
1239 spin_lock_irq(&sess->se_node_acl->device_list_lock);
1240 for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
1241 deve = sess->se_node_acl->device_list[i];
1242 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
1243 continue;
1244 /*
1245 * We determine the correct LUN LIST LENGTH even once we
1246 * have reached the initial allocation length.
1247 * See SPC2-R20 7.19.
1248 */
1249 lun_count++;
1250 if ((offset + 8) > cmd->data_length)
1251 continue;
1252
1253 int_to_scsilun(deve->mapped_lun, (struct scsi_lun *)&buf[offset]);
1254 offset += 8;
1255 }
1256 spin_unlock_irq(&sess->se_node_acl->device_list_lock);
1257
1258 /*
1259 * See SPC3 r07, page 159.
1260 */
1261 done:
1262 lun_count *= 8;
1263 buf[0] = ((lun_count >> 24) & 0xff);
1264 buf[1] = ((lun_count >> 16) & 0xff);
1265 buf[2] = ((lun_count >> 8) & 0xff);
1266 buf[3] = (lun_count & 0xff);
1267 transport_kunmap_data_sg(cmd);
1268
1269 target_complete_cmd(cmd, GOOD);
1270 return 0;
1271 }
1272 EXPORT_SYMBOL(spc_emulate_report_luns);
1273
1274 static sense_reason_t
1275 spc_emulate_testunitready(struct se_cmd *cmd)
1276 {
1277 target_complete_cmd(cmd, GOOD);
1278 return 0;
1279 }
1280
1281 sense_reason_t
1282 spc_parse_cdb(struct se_cmd *cmd, unsigned int *size)
1283 {
1284 struct se_device *dev = cmd->se_dev;
1285 unsigned char *cdb = cmd->t_task_cdb;
1286
1287 switch (cdb[0]) {
1288 case MODE_SELECT:
1289 *size = cdb[4];
1290 cmd->execute_cmd = spc_emulate_modeselect;
1291 break;
1292 case MODE_SELECT_10:
1293 *size = (cdb[7] << 8) + cdb[8];
1294 cmd->execute_cmd = spc_emulate_modeselect;
1295 break;
1296 case MODE_SENSE:
1297 *size = cdb[4];
1298 cmd->execute_cmd = spc_emulate_modesense;
1299 break;
1300 case MODE_SENSE_10:
1301 *size = (cdb[7] << 8) + cdb[8];
1302 cmd->execute_cmd = spc_emulate_modesense;
1303 break;
1304 case LOG_SELECT:
1305 case LOG_SENSE:
1306 *size = (cdb[7] << 8) + cdb[8];
1307 break;
1308 case PERSISTENT_RESERVE_IN:
1309 *size = (cdb[7] << 8) + cdb[8];
1310 cmd->execute_cmd = target_scsi3_emulate_pr_in;
1311 break;
1312 case PERSISTENT_RESERVE_OUT:
1313 *size = (cdb[7] << 8) + cdb[8];
1314 cmd->execute_cmd = target_scsi3_emulate_pr_out;
1315 break;
1316 case RELEASE:
1317 case RELEASE_10:
1318 if (cdb[0] == RELEASE_10)
1319 *size = (cdb[7] << 8) | cdb[8];
1320 else
1321 *size = cmd->data_length;
1322
1323 cmd->execute_cmd = target_scsi2_reservation_release;
1324 break;
1325 case RESERVE:
1326 case RESERVE_10:
1327 /*
1328 * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
1329 * Assume the passthrough or $FABRIC_MOD will tell us about it.
1330 */
1331 if (cdb[0] == RESERVE_10)
1332 *size = (cdb[7] << 8) | cdb[8];
1333 else
1334 *size = cmd->data_length;
1335
1336 cmd->execute_cmd = target_scsi2_reservation_reserve;
1337 break;
1338 case REQUEST_SENSE:
1339 *size = cdb[4];
1340 cmd->execute_cmd = spc_emulate_request_sense;
1341 break;
1342 case INQUIRY:
1343 *size = (cdb[3] << 8) + cdb[4];
1344
1345 /*
1346 * Do implicit HEAD_OF_QUEUE processing for INQUIRY.
1347 * See spc4r17 section 5.3
1348 */
1349 cmd->sam_task_attr = MSG_HEAD_TAG;
1350 cmd->execute_cmd = spc_emulate_inquiry;
1351 break;
1352 case SECURITY_PROTOCOL_IN:
1353 case SECURITY_PROTOCOL_OUT:
1354 *size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
1355 break;
1356 case EXTENDED_COPY:
1357 *size = get_unaligned_be32(&cdb[10]);
1358 cmd->execute_cmd = target_do_xcopy;
1359 break;
1360 case RECEIVE_COPY_RESULTS:
1361 *size = get_unaligned_be32(&cdb[10]);
1362 cmd->execute_cmd = target_do_receive_copy_results;
1363 break;
1364 case READ_ATTRIBUTE:
1365 case WRITE_ATTRIBUTE:
1366 *size = (cdb[10] << 24) | (cdb[11] << 16) |
1367 (cdb[12] << 8) | cdb[13];
1368 break;
1369 case RECEIVE_DIAGNOSTIC:
1370 case SEND_DIAGNOSTIC:
1371 *size = (cdb[3] << 8) | cdb[4];
1372 break;
1373 case WRITE_BUFFER:
1374 *size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
1375 break;
1376 case REPORT_LUNS:
1377 cmd->execute_cmd = spc_emulate_report_luns;
1378 *size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
1379 /*
1380 * Do implicit HEAD_OF_QUEUE processing for REPORT_LUNS
1381 * See spc4r17 section 5.3
1382 */
1383 cmd->sam_task_attr = MSG_HEAD_TAG;
1384 break;
1385 case TEST_UNIT_READY:
1386 cmd->execute_cmd = spc_emulate_testunitready;
1387 *size = 0;
1388 break;
1389 case MAINTENANCE_IN:
1390 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
1391 /*
1392 * MAINTENANCE_IN from SCC-2
1393 * Check for emulated MI_REPORT_TARGET_PGS
1394 */
1395 if ((cdb[1] & 0x1f) == MI_REPORT_TARGET_PGS) {
1396 cmd->execute_cmd =
1397 target_emulate_report_target_port_groups;
1398 }
1399 *size = get_unaligned_be32(&cdb[6]);
1400 } else {
1401 /*
1402 * GPCMD_SEND_KEY from multi media commands
1403 */
1404 *size = get_unaligned_be16(&cdb[8]);
1405 }
1406 break;
1407 case MAINTENANCE_OUT:
1408 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
1409 /*
1410 * MAINTENANCE_OUT from SCC-2
1411 * Check for emulated MO_SET_TARGET_PGS.
1412 */
1413 if (cdb[1] == MO_SET_TARGET_PGS) {
1414 cmd->execute_cmd =
1415 target_emulate_set_target_port_groups;
1416 }
1417 *size = get_unaligned_be32(&cdb[6]);
1418 } else {
1419 /*
1420 * GPCMD_SEND_KEY from multi media commands
1421 */
1422 *size = get_unaligned_be16(&cdb[8]);
1423 }
1424 break;
1425 default:
1426 pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode"
1427 " 0x%02x, sending CHECK_CONDITION.\n",
1428 cmd->se_tfo->get_fabric_name(), cdb[0]);
1429 return TCM_UNSUPPORTED_SCSI_OPCODE;
1430 }
1431
1432 return 0;
1433 }
1434 EXPORT_SYMBOL(spc_parse_cdb);
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