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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_proto.h>
28#include <scsi/scsi_common.h>
29#include <scsi/scsi_tcq.h>
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_alua.h"
37#include "target_core_pr.h"
38#include "target_core_ua.h"
39#include "target_core_xcopy.h"
40
41static void spc_fill_alua_data(struct se_lun *lun, unsigned char *buf)
42{
43 struct t10_alua_tg_pt_gp *tg_pt_gp;
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 spin_lock(&lun->lun_tg_pt_gp_lock);
57 tg_pt_gp = lun->lun_tg_pt_gp;
58 if (tg_pt_gp)
59 buf[5] |= tg_pt_gp->tg_pt_gp_alua_access_type;
60 spin_unlock(&lun->lun_tg_pt_gp_lock);
61}
62
63sense_reason_t
64spc_emulate_inquiry_std(struct se_cmd *cmd, unsigned char *buf)
65{
66 struct se_lun *lun = cmd->se_lun;
67 struct se_device *dev = cmd->se_dev;
68 struct se_session *sess = cmd->se_sess;
69
70 /* Set RMB (removable media) for tape devices */
71 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
72 buf[1] = 0x80;
73
74 buf[2] = 0x05; /* SPC-3 */
75
76 /*
77 * NORMACA and HISUP = 0, RESPONSE DATA FORMAT = 2
78 *
79 * SPC4 says:
80 * A RESPONSE DATA FORMAT field set to 2h indicates that the
81 * standard INQUIRY data is in the format defined in this
82 * standard. Response data format values less than 2h are
83 * obsolete. Response data format values greater than 2h are
84 * reserved.
85 */
86 buf[3] = 2;
87
88 /*
89 * Enable SCCS and TPGS fields for Emulated ALUA
90 */
91 spc_fill_alua_data(lun, buf);
92
93 /*
94 * Set Third-Party Copy (3PC) bit to indicate support for EXTENDED_COPY
95 */
96 if (dev->dev_attrib.emulate_3pc)
97 buf[5] |= 0x8;
98 /*
99 * Set Protection (PROTECT) bit when DIF has been enabled on the
100 * device, and the fabric supports VERIFY + PASS. Also report
101 * PROTECT=1 if sess_prot_type has been configured to allow T10-PI
102 * to unprotected devices.
103 */
104 if (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) {
105 if (dev->dev_attrib.pi_prot_type || cmd->se_sess->sess_prot_type)
106 buf[5] |= 0x1;
107 }
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}
121EXPORT_SYMBOL(spc_emulate_inquiry_std);
122
123/* unit serial number */
124static sense_reason_t
125spc_emulate_evpd_80(struct se_cmd *cmd, unsigned char *buf)
126{
127 struct se_device *dev = cmd->se_dev;
128 u16 len;
129
130 if (dev->dev_flags & DF_EMULATED_VPD_UNIT_SERIAL) {
131 len = sprintf(&buf[4], "%s", dev->t10_wwn.unit_serial);
132 len++; /* Extra Byte for NULL Terminator */
133 buf[3] = len;
134 }
135 return 0;
136}
137
138void spc_parse_naa_6h_vendor_specific(struct se_device *dev,
139 unsigned char *buf)
140{
141 unsigned char *p = &dev->t10_wwn.unit_serial[0];
142 int cnt;
143 bool next = true;
144
145 /*
146 * Generate up to 36 bits of VENDOR SPECIFIC IDENTIFIER starting on
147 * byte 3 bit 3-0 for NAA IEEE Registered Extended DESIGNATOR field
148 * format, followed by 64 bits of VENDOR SPECIFIC IDENTIFIER EXTENSION
149 * to complete the payload. These are based from VPD=0x80 PRODUCT SERIAL
150 * NUMBER set via vpd_unit_serial in target_core_configfs.c to ensure
151 * per device uniqeness.
152 */
153 for (cnt = 0; *p && cnt < 13; p++) {
154 int val = hex_to_bin(*p);
155
156 if (val < 0)
157 continue;
158
159 if (next) {
160 next = false;
161 buf[cnt++] |= val;
162 } else {
163 next = true;
164 buf[cnt] = val << 4;
165 }
166 }
167}
168
169/*
170 * Device identification VPD, for a complete list of
171 * DESIGNATOR TYPEs see spc4r17 Table 459.
172 */
173sense_reason_t
174spc_emulate_evpd_83(struct se_cmd *cmd, unsigned char *buf)
175{
176 struct se_device *dev = cmd->se_dev;
177 struct se_lun *lun = cmd->se_lun;
178 struct se_portal_group *tpg = NULL;
179 struct t10_alua_lu_gp_member *lu_gp_mem;
180 struct t10_alua_tg_pt_gp *tg_pt_gp;
181 unsigned char *prod = &dev->t10_wwn.model[0];
182 u32 prod_len;
183 u32 unit_serial_len, off = 0;
184 u16 len = 0, id_len;
185
186 off = 4;
187
188 /*
189 * NAA IEEE Registered Extended Assigned designator format, see
190 * spc4r17 section 7.7.3.6.5
191 *
192 * We depend upon a target_core_mod/ConfigFS provided
193 * /sys/kernel/config/target/core/$HBA/$DEV/wwn/vpd_unit_serial
194 * value in order to return the NAA id.
195 */
196 if (!(dev->dev_flags & DF_EMULATED_VPD_UNIT_SERIAL))
197 goto check_t10_vend_desc;
198
199 /* CODE SET == Binary */
200 buf[off++] = 0x1;
201
202 /* Set ASSOCIATION == addressed logical unit: 0)b */
203 buf[off] = 0x00;
204
205 /* Identifier/Designator type == NAA identifier */
206 buf[off++] |= 0x3;
207 off++;
208
209 /* Identifier/Designator length */
210 buf[off++] = 0x10;
211
212 /*
213 * Start NAA IEEE Registered Extended Identifier/Designator
214 */
215 buf[off++] = (0x6 << 4);
216
217 /*
218 * Use OpenFabrics IEEE Company ID: 00 14 05
219 */
220 buf[off++] = 0x01;
221 buf[off++] = 0x40;
222 buf[off] = (0x5 << 4);
223
224 /*
225 * Return ConfigFS Unit Serial Number information for
226 * VENDOR_SPECIFIC_IDENTIFIER and
227 * VENDOR_SPECIFIC_IDENTIFIER_EXTENTION
228 */
229 spc_parse_naa_6h_vendor_specific(dev, &buf[off]);
230
231 len = 20;
232 off = (len + 4);
233
234check_t10_vend_desc:
235 /*
236 * T10 Vendor Identifier Page, see spc4r17 section 7.7.3.4
237 */
238 id_len = 8; /* For Vendor field */
239 prod_len = 4; /* For VPD Header */
240 prod_len += 8; /* For Vendor field */
241 prod_len += strlen(prod);
242 prod_len++; /* For : */
243
244 if (dev->dev_flags & DF_EMULATED_VPD_UNIT_SERIAL) {
245 unit_serial_len = strlen(&dev->t10_wwn.unit_serial[0]);
246 unit_serial_len++; /* For NULL Terminator */
247
248 id_len += sprintf(&buf[off+12], "%s:%s", prod,
249 &dev->t10_wwn.unit_serial[0]);
250 }
251 buf[off] = 0x2; /* ASCII */
252 buf[off+1] = 0x1; /* T10 Vendor ID */
253 buf[off+2] = 0x0;
254 memcpy(&buf[off+4], "LIO-ORG", 8);
255 /* Extra Byte for NULL Terminator */
256 id_len++;
257 /* Identifier Length */
258 buf[off+3] = id_len;
259 /* Header size for Designation descriptor */
260 len += (id_len + 4);
261 off += (id_len + 4);
262
263 if (1) {
264 struct t10_alua_lu_gp *lu_gp;
265 u32 padding, scsi_name_len, scsi_target_len;
266 u16 lu_gp_id = 0;
267 u16 tg_pt_gp_id = 0;
268 u16 tpgt;
269
270 tpg = lun->lun_tpg;
271 /*
272 * Relative target port identifer, see spc4r17
273 * section 7.7.3.7
274 *
275 * Get the PROTOCOL IDENTIFIER as defined by spc4r17
276 * section 7.5.1 Table 362
277 */
278 buf[off] = tpg->proto_id << 4;
279 buf[off++] |= 0x1; /* CODE SET == Binary */
280 buf[off] = 0x80; /* Set PIV=1 */
281 /* Set ASSOCIATION == target port: 01b */
282 buf[off] |= 0x10;
283 /* DESIGNATOR TYPE == Relative target port identifer */
284 buf[off++] |= 0x4;
285 off++; /* Skip over Reserved */
286 buf[off++] = 4; /* DESIGNATOR LENGTH */
287 /* Skip over Obsolete field in RTPI payload
288 * in Table 472 */
289 off += 2;
290 put_unaligned_be16(lun->lun_rtpi, &buf[off]);
291 off += 2;
292 len += 8; /* Header size + Designation descriptor */
293 /*
294 * Target port group identifier, see spc4r17
295 * section 7.7.3.8
296 *
297 * Get the PROTOCOL IDENTIFIER as defined by spc4r17
298 * section 7.5.1 Table 362
299 */
300 spin_lock(&lun->lun_tg_pt_gp_lock);
301 tg_pt_gp = lun->lun_tg_pt_gp;
302 if (!tg_pt_gp) {
303 spin_unlock(&lun->lun_tg_pt_gp_lock);
304 goto check_lu_gp;
305 }
306 tg_pt_gp_id = tg_pt_gp->tg_pt_gp_id;
307 spin_unlock(&lun->lun_tg_pt_gp_lock);
308
309 buf[off] = tpg->proto_id << 4;
310 buf[off++] |= 0x1; /* CODE SET == Binary */
311 buf[off] = 0x80; /* Set PIV=1 */
312 /* Set ASSOCIATION == target port: 01b */
313 buf[off] |= 0x10;
314 /* DESIGNATOR TYPE == Target port group identifier */
315 buf[off++] |= 0x5;
316 off++; /* Skip over Reserved */
317 buf[off++] = 4; /* DESIGNATOR LENGTH */
318 off += 2; /* Skip over Reserved Field */
319 put_unaligned_be16(tg_pt_gp_id, &buf[off]);
320 off += 2;
321 len += 8; /* Header size + Designation descriptor */
322 /*
323 * Logical Unit Group identifier, see spc4r17
324 * section 7.7.3.8
325 */
326check_lu_gp:
327 lu_gp_mem = dev->dev_alua_lu_gp_mem;
328 if (!lu_gp_mem)
329 goto check_scsi_name;
330
331 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
332 lu_gp = lu_gp_mem->lu_gp;
333 if (!lu_gp) {
334 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
335 goto check_scsi_name;
336 }
337 lu_gp_id = lu_gp->lu_gp_id;
338 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
339
340 buf[off++] |= 0x1; /* CODE SET == Binary */
341 /* DESIGNATOR TYPE == Logical Unit Group identifier */
342 buf[off++] |= 0x6;
343 off++; /* Skip over Reserved */
344 buf[off++] = 4; /* DESIGNATOR LENGTH */
345 off += 2; /* Skip over Reserved Field */
346 put_unaligned_be16(lu_gp_id, &buf[off]);
347 off += 2;
348 len += 8; /* Header size + Designation descriptor */
349 /*
350 * SCSI name string designator, see spc4r17
351 * section 7.7.3.11
352 *
353 * Get the PROTOCOL IDENTIFIER as defined by spc4r17
354 * section 7.5.1 Table 362
355 */
356check_scsi_name:
357 buf[off] = tpg->proto_id << 4;
358 buf[off++] |= 0x3; /* CODE SET == UTF-8 */
359 buf[off] = 0x80; /* Set PIV=1 */
360 /* Set ASSOCIATION == target port: 01b */
361 buf[off] |= 0x10;
362 /* DESIGNATOR TYPE == SCSI name string */
363 buf[off++] |= 0x8;
364 off += 2; /* Skip over Reserved and length */
365 /*
366 * SCSI name string identifer containing, $FABRIC_MOD
367 * dependent information. For LIO-Target and iSCSI
368 * Target Port, this means "<iSCSI name>,t,0x<TPGT> in
369 * UTF-8 encoding.
370 */
371 tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg);
372 scsi_name_len = sprintf(&buf[off], "%s,t,0x%04x",
373 tpg->se_tpg_tfo->tpg_get_wwn(tpg), tpgt);
374 scsi_name_len += 1 /* Include NULL terminator */;
375 /*
376 * The null-terminated, null-padded (see 4.4.2) SCSI
377 * NAME STRING field contains a UTF-8 format string.
378 * The number of bytes in the SCSI NAME STRING field
379 * (i.e., the value in the DESIGNATOR LENGTH field)
380 * shall be no larger than 256 and shall be a multiple
381 * of four.
382 */
383 padding = ((-scsi_name_len) & 3);
384 if (padding)
385 scsi_name_len += padding;
386 if (scsi_name_len > 256)
387 scsi_name_len = 256;
388
389 buf[off-1] = scsi_name_len;
390 off += scsi_name_len;
391 /* Header size + Designation descriptor */
392 len += (scsi_name_len + 4);
393
394 /*
395 * Target device designator
396 */
397 buf[off] = tpg->proto_id << 4;
398 buf[off++] |= 0x3; /* CODE SET == UTF-8 */
399 buf[off] = 0x80; /* Set PIV=1 */
400 /* Set ASSOCIATION == target device: 10b */
401 buf[off] |= 0x20;
402 /* DESIGNATOR TYPE == SCSI name string */
403 buf[off++] |= 0x8;
404 off += 2; /* Skip over Reserved and length */
405 /*
406 * SCSI name string identifer containing, $FABRIC_MOD
407 * dependent information. For LIO-Target and iSCSI
408 * Target Port, this means "<iSCSI name>" in
409 * UTF-8 encoding.
410 */
411 scsi_target_len = sprintf(&buf[off], "%s",
412 tpg->se_tpg_tfo->tpg_get_wwn(tpg));
413 scsi_target_len += 1 /* Include NULL terminator */;
414 /*
415 * The null-terminated, null-padded (see 4.4.2) SCSI
416 * NAME STRING field contains a UTF-8 format string.
417 * The number of bytes in the SCSI NAME STRING field
418 * (i.e., the value in the DESIGNATOR LENGTH field)
419 * shall be no larger than 256 and shall be a multiple
420 * of four.
421 */
422 padding = ((-scsi_target_len) & 3);
423 if (padding)
424 scsi_target_len += padding;
425 if (scsi_target_len > 256)
426 scsi_target_len = 256;
427
428 buf[off-1] = scsi_target_len;
429 off += scsi_target_len;
430
431 /* Header size + Designation descriptor */
432 len += (scsi_target_len + 4);
433 }
434 put_unaligned_be16(len, &buf[2]); /* Page Length for VPD 0x83 */
435 return 0;
436}
437EXPORT_SYMBOL(spc_emulate_evpd_83);
438
439/* Extended INQUIRY Data VPD Page */
440static sense_reason_t
441spc_emulate_evpd_86(struct se_cmd *cmd, unsigned char *buf)
442{
443 struct se_device *dev = cmd->se_dev;
444 struct se_session *sess = cmd->se_sess;
445
446 buf[3] = 0x3c;
447 /*
448 * Set GRD_CHK + REF_CHK for TYPE1 protection, or GRD_CHK
449 * only for TYPE3 protection.
450 */
451 if (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) {
452 if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE1_PROT ||
453 cmd->se_sess->sess_prot_type == TARGET_DIF_TYPE1_PROT)
454 buf[4] = 0x5;
455 else if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE3_PROT ||
456 cmd->se_sess->sess_prot_type == TARGET_DIF_TYPE3_PROT)
457 buf[4] = 0x4;
458 }
459
460 /* logical unit supports type 1 and type 3 protection */
461 if ((dev->transport->get_device_type(dev) == TYPE_DISK) &&
462 (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) &&
463 (dev->dev_attrib.pi_prot_type || cmd->se_sess->sess_prot_type)) {
464 buf[4] |= (0x3 << 3);
465 }
466
467 /* Set HEADSUP, ORDSUP, SIMPSUP */
468 buf[5] = 0x07;
469
470 /* If WriteCache emulation is enabled, set V_SUP */
471 if (target_check_wce(dev))
472 buf[6] = 0x01;
473 /* If an LBA map is present set R_SUP */
474 spin_lock(&cmd->se_dev->t10_alua.lba_map_lock);
475 if (!list_empty(&dev->t10_alua.lba_map_list))
476 buf[8] = 0x10;
477 spin_unlock(&cmd->se_dev->t10_alua.lba_map_lock);
478 return 0;
479}
480
481/* Block Limits VPD page */
482static sense_reason_t
483spc_emulate_evpd_b0(struct se_cmd *cmd, unsigned char *buf)
484{
485 struct se_device *dev = cmd->se_dev;
486 u32 mtl = 0;
487 int have_tp = 0, opt, min;
488
489 /*
490 * Following spc3r22 section 6.5.3 Block Limits VPD page, when
491 * emulate_tpu=1 or emulate_tpws=1 we will be expect a
492 * different page length for Thin Provisioning.
493 */
494 if (dev->dev_attrib.emulate_tpu || dev->dev_attrib.emulate_tpws)
495 have_tp = 1;
496
497 buf[0] = dev->transport->get_device_type(dev);
498 buf[3] = have_tp ? 0x3c : 0x10;
499
500 /* Set WSNZ to 1 */
501 buf[4] = 0x01;
502 /*
503 * Set MAXIMUM COMPARE AND WRITE LENGTH
504 */
505 if (dev->dev_attrib.emulate_caw)
506 buf[5] = 0x01;
507
508 /*
509 * Set OPTIMAL TRANSFER LENGTH GRANULARITY
510 */
511 if (dev->transport->get_io_min && (min = dev->transport->get_io_min(dev)))
512 put_unaligned_be16(min / dev->dev_attrib.block_size, &buf[6]);
513 else
514 put_unaligned_be16(1, &buf[6]);
515
516 /*
517 * Set MAXIMUM TRANSFER LENGTH
518 *
519 * XXX: Currently assumes single PAGE_SIZE per scatterlist for fabrics
520 * enforcing maximum HW scatter-gather-list entry limit
521 */
522 if (cmd->se_tfo->max_data_sg_nents) {
523 mtl = (cmd->se_tfo->max_data_sg_nents * PAGE_SIZE) /
524 dev->dev_attrib.block_size;
525 }
526 put_unaligned_be32(min_not_zero(mtl, dev->dev_attrib.hw_max_sectors), &buf[8]);
527
528 /*
529 * Set OPTIMAL TRANSFER LENGTH
530 */
531 if (dev->transport->get_io_opt && (opt = dev->transport->get_io_opt(dev)))
532 put_unaligned_be32(opt / dev->dev_attrib.block_size, &buf[12]);
533 else
534 put_unaligned_be32(dev->dev_attrib.optimal_sectors, &buf[12]);
535
536 /*
537 * Exit now if we don't support TP.
538 */
539 if (!have_tp)
540 goto max_write_same;
541
542 /*
543 * Set MAXIMUM UNMAP LBA COUNT
544 */
545 put_unaligned_be32(dev->dev_attrib.max_unmap_lba_count, &buf[20]);
546
547 /*
548 * Set MAXIMUM UNMAP BLOCK DESCRIPTOR COUNT
549 */
550 put_unaligned_be32(dev->dev_attrib.max_unmap_block_desc_count,
551 &buf[24]);
552
553 /*
554 * Set OPTIMAL UNMAP GRANULARITY
555 */
556 put_unaligned_be32(dev->dev_attrib.unmap_granularity, &buf[28]);
557
558 /*
559 * UNMAP GRANULARITY ALIGNMENT
560 */
561 put_unaligned_be32(dev->dev_attrib.unmap_granularity_alignment,
562 &buf[32]);
563 if (dev->dev_attrib.unmap_granularity_alignment != 0)
564 buf[32] |= 0x80; /* Set the UGAVALID bit */
565
566 /*
567 * MAXIMUM WRITE SAME LENGTH
568 */
569max_write_same:
570 put_unaligned_be64(dev->dev_attrib.max_write_same_len, &buf[36]);
571
572 return 0;
573}
574
575/* Block Device Characteristics VPD page */
576static sense_reason_t
577spc_emulate_evpd_b1(struct se_cmd *cmd, unsigned char *buf)
578{
579 struct se_device *dev = cmd->se_dev;
580
581 buf[0] = dev->transport->get_device_type(dev);
582 buf[3] = 0x3c;
583 buf[5] = dev->dev_attrib.is_nonrot ? 1 : 0;
584
585 return 0;
586}
587
588/* Thin Provisioning VPD */
589static sense_reason_t
590spc_emulate_evpd_b2(struct se_cmd *cmd, unsigned char *buf)
591{
592 struct se_device *dev = cmd->se_dev;
593
594 /*
595 * From spc3r22 section 6.5.4 Thin Provisioning VPD page:
596 *
597 * The PAGE LENGTH field is defined in SPC-4. If the DP bit is set to
598 * zero, then the page length shall be set to 0004h. If the DP bit
599 * is set to one, then the page length shall be set to the value
600 * defined in table 162.
601 */
602 buf[0] = dev->transport->get_device_type(dev);
603
604 /*
605 * Set Hardcoded length mentioned above for DP=0
606 */
607 put_unaligned_be16(0x0004, &buf[2]);
608
609 /*
610 * The THRESHOLD EXPONENT field indicates the threshold set size in
611 * LBAs as a power of 2 (i.e., the threshold set size is equal to
612 * 2(threshold exponent)).
613 *
614 * Note that this is currently set to 0x00 as mkp says it will be
615 * changing again. We can enable this once it has settled in T10
616 * and is actually used by Linux/SCSI ML code.
617 */
618 buf[4] = 0x00;
619
620 /*
621 * A TPU bit set to one indicates that the device server supports
622 * the UNMAP command (see 5.25). A TPU bit set to zero indicates
623 * that the device server does not support the UNMAP command.
624 */
625 if (dev->dev_attrib.emulate_tpu != 0)
626 buf[5] = 0x80;
627
628 /*
629 * A TPWS bit set to one indicates that the device server supports
630 * the use of the WRITE SAME (16) command (see 5.42) to unmap LBAs.
631 * A TPWS bit set to zero indicates that the device server does not
632 * support the use of the WRITE SAME (16) command to unmap LBAs.
633 */
634 if (dev->dev_attrib.emulate_tpws != 0)
635 buf[5] |= 0x40 | 0x20;
636
637 /*
638 * The unmap_zeroes_data set means that the underlying device supports
639 * REQ_DISCARD and has the discard_zeroes_data bit set. This satisfies
640 * the SBC requirements for LBPRZ, meaning that a subsequent read
641 * will return zeroes after an UNMAP or WRITE SAME (16) to an LBA
642 * See sbc4r36 6.6.4.
643 */
644 if (((dev->dev_attrib.emulate_tpu != 0) ||
645 (dev->dev_attrib.emulate_tpws != 0)) &&
646 (dev->dev_attrib.unmap_zeroes_data != 0))
647 buf[5] |= 0x04;
648
649 return 0;
650}
651
652/* Referrals VPD page */
653static sense_reason_t
654spc_emulate_evpd_b3(struct se_cmd *cmd, unsigned char *buf)
655{
656 struct se_device *dev = cmd->se_dev;
657
658 buf[0] = dev->transport->get_device_type(dev);
659 buf[3] = 0x0c;
660 put_unaligned_be32(dev->t10_alua.lba_map_segment_size, &buf[8]);
661 put_unaligned_be32(dev->t10_alua.lba_map_segment_multiplier, &buf[12]);
662
663 return 0;
664}
665
666static sense_reason_t
667spc_emulate_evpd_00(struct se_cmd *cmd, unsigned char *buf);
668
669static struct {
670 uint8_t page;
671 sense_reason_t (*emulate)(struct se_cmd *, unsigned char *);
672} evpd_handlers[] = {
673 { .page = 0x00, .emulate = spc_emulate_evpd_00 },
674 { .page = 0x80, .emulate = spc_emulate_evpd_80 },
675 { .page = 0x83, .emulate = spc_emulate_evpd_83 },
676 { .page = 0x86, .emulate = spc_emulate_evpd_86 },
677 { .page = 0xb0, .emulate = spc_emulate_evpd_b0 },
678 { .page = 0xb1, .emulate = spc_emulate_evpd_b1 },
679 { .page = 0xb2, .emulate = spc_emulate_evpd_b2 },
680 { .page = 0xb3, .emulate = spc_emulate_evpd_b3 },
681};
682
683/* supported vital product data pages */
684static sense_reason_t
685spc_emulate_evpd_00(struct se_cmd *cmd, unsigned char *buf)
686{
687 int p;
688
689 /*
690 * Only report the INQUIRY EVPD=1 pages after a valid NAA
691 * Registered Extended LUN WWN has been set via ConfigFS
692 * during device creation/restart.
693 */
694 if (cmd->se_dev->dev_flags & DF_EMULATED_VPD_UNIT_SERIAL) {
695 buf[3] = ARRAY_SIZE(evpd_handlers);
696 for (p = 0; p < ARRAY_SIZE(evpd_handlers); ++p)
697 buf[p + 4] = evpd_handlers[p].page;
698 }
699
700 return 0;
701}
702
703static sense_reason_t
704spc_emulate_inquiry(struct se_cmd *cmd)
705{
706 struct se_device *dev = cmd->se_dev;
707 struct se_portal_group *tpg = cmd->se_lun->lun_tpg;
708 unsigned char *rbuf;
709 unsigned char *cdb = cmd->t_task_cdb;
710 unsigned char *buf;
711 sense_reason_t ret;
712 int p;
713 int len = 0;
714
715 buf = kzalloc(SE_INQUIRY_BUF, GFP_KERNEL);
716 if (!buf) {
717 pr_err("Unable to allocate response buffer for INQUIRY\n");
718 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
719 }
720
721 if (dev == rcu_access_pointer(tpg->tpg_virt_lun0->lun_se_dev))
722 buf[0] = 0x3f; /* Not connected */
723 else
724 buf[0] = dev->transport->get_device_type(dev);
725
726 if (!(cdb[1] & 0x1)) {
727 if (cdb[2]) {
728 pr_err("INQUIRY with EVPD==0 but PAGE CODE=%02x\n",
729 cdb[2]);
730 ret = TCM_INVALID_CDB_FIELD;
731 goto out;
732 }
733
734 ret = spc_emulate_inquiry_std(cmd, buf);
735 len = buf[4] + 5;
736 goto out;
737 }
738
739 for (p = 0; p < ARRAY_SIZE(evpd_handlers); ++p) {
740 if (cdb[2] == evpd_handlers[p].page) {
741 buf[1] = cdb[2];
742 ret = evpd_handlers[p].emulate(cmd, buf);
743 len = get_unaligned_be16(&buf[2]) + 4;
744 goto out;
745 }
746 }
747
748 pr_err("Unknown VPD Code: 0x%02x\n", cdb[2]);
749 ret = TCM_INVALID_CDB_FIELD;
750
751out:
752 rbuf = transport_kmap_data_sg(cmd);
753 if (rbuf) {
754 memcpy(rbuf, buf, min_t(u32, SE_INQUIRY_BUF, cmd->data_length));
755 transport_kunmap_data_sg(cmd);
756 }
757 kfree(buf);
758
759 if (!ret)
760 target_complete_cmd_with_length(cmd, GOOD, len);
761 return ret;
762}
763
764static int spc_modesense_rwrecovery(struct se_cmd *cmd, u8 pc, u8 *p)
765{
766 p[0] = 0x01;
767 p[1] = 0x0a;
768
769 /* No changeable values for now */
770 if (pc == 1)
771 goto out;
772
773out:
774 return 12;
775}
776
777static int spc_modesense_control(struct se_cmd *cmd, u8 pc, u8 *p)
778{
779 struct se_device *dev = cmd->se_dev;
780 struct se_session *sess = cmd->se_sess;
781
782 p[0] = 0x0a;
783 p[1] = 0x0a;
784
785 /* No changeable values for now */
786 if (pc == 1)
787 goto out;
788
789 /* GLTSD: No implicit save of log parameters */
790 p[2] = (1 << 1);
791 if (target_sense_desc_format(dev))
792 /* D_SENSE: Descriptor format sense data for 64bit sectors */
793 p[2] |= (1 << 2);
794
795 /*
796 * From spc4r23, 7.4.7 Control mode page
797 *
798 * The QUEUE ALGORITHM MODIFIER field (see table 368) specifies
799 * restrictions on the algorithm used for reordering commands
800 * having the SIMPLE task attribute (see SAM-4).
801 *
802 * Table 368 -- QUEUE ALGORITHM MODIFIER field
803 * Code Description
804 * 0h Restricted reordering
805 * 1h Unrestricted reordering allowed
806 * 2h to 7h Reserved
807 * 8h to Fh Vendor specific
808 *
809 * A value of zero in the QUEUE ALGORITHM MODIFIER field specifies that
810 * the device server shall order the processing sequence of commands
811 * having the SIMPLE task attribute such that data integrity is maintained
812 * for that I_T nexus (i.e., if the transmission of new SCSI transport protocol
813 * requests is halted at any time, the final value of all data observable
814 * on the medium shall be the same as if all the commands had been processed
815 * with the ORDERED task attribute).
816 *
817 * A value of one in the QUEUE ALGORITHM MODIFIER field specifies that the
818 * device server may reorder the processing sequence of commands having the
819 * SIMPLE task attribute in any manner. Any data integrity exposures related to
820 * command sequence order shall be explicitly handled by the application client
821 * through the selection of appropriate ommands and task attributes.
822 */
823 p[3] = (dev->dev_attrib.emulate_rest_reord == 1) ? 0x00 : 0x10;
824 /*
825 * From spc4r17, section 7.4.6 Control mode Page
826 *
827 * Unit Attention interlocks control (UN_INTLCK_CTRL) to code 00b
828 *
829 * 00b: The logical unit shall clear any unit attention condition
830 * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION
831 * status and shall not establish a unit attention condition when a com-
832 * mand is completed with BUSY, TASK SET FULL, or RESERVATION CONFLICT
833 * status.
834 *
835 * 10b: The logical unit shall not clear any unit attention condition
836 * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION
837 * status and shall not establish a unit attention condition when
838 * a command is completed with BUSY, TASK SET FULL, or RESERVATION
839 * CONFLICT status.
840 *
841 * 11b a The logical unit shall not clear any unit attention condition
842 * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION
843 * status and shall establish a unit attention condition for the
844 * initiator port associated with the I_T nexus on which the BUSY,
845 * TASK SET FULL, or RESERVATION CONFLICT status is being returned.
846 * Depending on the status, the additional sense code shall be set to
847 * PREVIOUS BUSY STATUS, PREVIOUS TASK SET FULL STATUS, or PREVIOUS
848 * RESERVATION CONFLICT STATUS. Until it is cleared by a REQUEST SENSE
849 * command, a unit attention condition shall be established only once
850 * for a BUSY, TASK SET FULL, or RESERVATION CONFLICT status regardless
851 * to the number of commands completed with one of those status codes.
852 */
853 p[4] = (dev->dev_attrib.emulate_ua_intlck_ctrl == 2) ? 0x30 :
854 (dev->dev_attrib.emulate_ua_intlck_ctrl == 1) ? 0x20 : 0x00;
855 /*
856 * From spc4r17, section 7.4.6 Control mode Page
857 *
858 * Task Aborted Status (TAS) bit set to zero.
859 *
860 * A task aborted status (TAS) bit set to zero specifies that aborted
861 * tasks shall be terminated by the device server without any response
862 * to the application client. A TAS bit set to one specifies that tasks
863 * aborted by the actions of an I_T nexus other than the I_T nexus on
864 * which the command was received shall be completed with TASK ABORTED
865 * status (see SAM-4).
866 */
867 p[5] = (dev->dev_attrib.emulate_tas) ? 0x40 : 0x00;
868 /*
869 * From spc4r30, section 7.5.7 Control mode page
870 *
871 * Application Tag Owner (ATO) bit set to one.
872 *
873 * If the ATO bit is set to one the device server shall not modify the
874 * LOGICAL BLOCK APPLICATION TAG field and, depending on the protection
875 * type, shall not modify the contents of the LOGICAL BLOCK REFERENCE
876 * TAG field.
877 */
878 if (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) {
879 if (dev->dev_attrib.pi_prot_type || sess->sess_prot_type)
880 p[5] |= 0x80;
881 }
882
883 p[8] = 0xff;
884 p[9] = 0xff;
885 p[11] = 30;
886
887out:
888 return 12;
889}
890
891static int spc_modesense_caching(struct se_cmd *cmd, u8 pc, u8 *p)
892{
893 struct se_device *dev = cmd->se_dev;
894
895 p[0] = 0x08;
896 p[1] = 0x12;
897
898 /* No changeable values for now */
899 if (pc == 1)
900 goto out;
901
902 if (target_check_wce(dev))
903 p[2] = 0x04; /* Write Cache Enable */
904 p[12] = 0x20; /* Disabled Read Ahead */
905
906out:
907 return 20;
908}
909
910static int spc_modesense_informational_exceptions(struct se_cmd *cmd, u8 pc, unsigned char *p)
911{
912 p[0] = 0x1c;
913 p[1] = 0x0a;
914
915 /* No changeable values for now */
916 if (pc == 1)
917 goto out;
918
919out:
920 return 12;
921}
922
923static struct {
924 uint8_t page;
925 uint8_t subpage;
926 int (*emulate)(struct se_cmd *, u8, unsigned char *);
927} modesense_handlers[] = {
928 { .page = 0x01, .subpage = 0x00, .emulate = spc_modesense_rwrecovery },
929 { .page = 0x08, .subpage = 0x00, .emulate = spc_modesense_caching },
930 { .page = 0x0a, .subpage = 0x00, .emulate = spc_modesense_control },
931 { .page = 0x1c, .subpage = 0x00, .emulate = spc_modesense_informational_exceptions },
932};
933
934static void spc_modesense_write_protect(unsigned char *buf, int type)
935{
936 /*
937 * I believe that the WP bit (bit 7) in the mode header is the same for
938 * all device types..
939 */
940 switch (type) {
941 case TYPE_DISK:
942 case TYPE_TAPE:
943 default:
944 buf[0] |= 0x80; /* WP bit */
945 break;
946 }
947}
948
949static void spc_modesense_dpofua(unsigned char *buf, int type)
950{
951 switch (type) {
952 case TYPE_DISK:
953 buf[0] |= 0x10; /* DPOFUA bit */
954 break;
955 default:
956 break;
957 }
958}
959
960static int spc_modesense_blockdesc(unsigned char *buf, u64 blocks, u32 block_size)
961{
962 *buf++ = 8;
963 put_unaligned_be32(min(blocks, 0xffffffffull), buf);
964 buf += 4;
965 put_unaligned_be32(block_size, buf);
966 return 9;
967}
968
969static int spc_modesense_long_blockdesc(unsigned char *buf, u64 blocks, u32 block_size)
970{
971 if (blocks <= 0xffffffff)
972 return spc_modesense_blockdesc(buf + 3, blocks, block_size) + 3;
973
974 *buf++ = 1; /* LONGLBA */
975 buf += 2;
976 *buf++ = 16;
977 put_unaligned_be64(blocks, buf);
978 buf += 12;
979 put_unaligned_be32(block_size, buf);
980
981 return 17;
982}
983
984static sense_reason_t spc_emulate_modesense(struct se_cmd *cmd)
985{
986 struct se_device *dev = cmd->se_dev;
987 char *cdb = cmd->t_task_cdb;
988 unsigned char buf[SE_MODE_PAGE_BUF], *rbuf;
989 int type = dev->transport->get_device_type(dev);
990 int ten = (cmd->t_task_cdb[0] == MODE_SENSE_10);
991 bool dbd = !!(cdb[1] & 0x08);
992 bool llba = ten ? !!(cdb[1] & 0x10) : false;
993 u8 pc = cdb[2] >> 6;
994 u8 page = cdb[2] & 0x3f;
995 u8 subpage = cdb[3];
996 int length = 0;
997 int ret;
998 int i;
999
1000 memset(buf, 0, SE_MODE_PAGE_BUF);
1001
1002 /*
1003 * Skip over MODE DATA LENGTH + MEDIUM TYPE fields to byte 3 for
1004 * MODE_SENSE_10 and byte 2 for MODE_SENSE (6).
1005 */
1006 length = ten ? 3 : 2;
1007
1008 /* DEVICE-SPECIFIC PARAMETER */
1009 if (cmd->se_lun->lun_access_ro || target_lun_is_rdonly(cmd))
1010 spc_modesense_write_protect(&buf[length], type);
1011
1012 /*
1013 * SBC only allows us to enable FUA and DPO together. Fortunately
1014 * DPO is explicitly specified as a hint, so a noop is a perfectly
1015 * valid implementation.
1016 */
1017 if (target_check_fua(dev))
1018 spc_modesense_dpofua(&buf[length], type);
1019
1020 ++length;
1021
1022 /* BLOCK DESCRIPTOR */
1023
1024 /*
1025 * For now we only include a block descriptor for disk (SBC)
1026 * devices; other command sets use a slightly different format.
1027 */
1028 if (!dbd && type == TYPE_DISK) {
1029 u64 blocks = dev->transport->get_blocks(dev);
1030 u32 block_size = dev->dev_attrib.block_size;
1031
1032 if (ten) {
1033 if (llba) {
1034 length += spc_modesense_long_blockdesc(&buf[length],
1035 blocks, block_size);
1036 } else {
1037 length += 3;
1038 length += spc_modesense_blockdesc(&buf[length],
1039 blocks, block_size);
1040 }
1041 } else {
1042 length += spc_modesense_blockdesc(&buf[length], blocks,
1043 block_size);
1044 }
1045 } else {
1046 if (ten)
1047 length += 4;
1048 else
1049 length += 1;
1050 }
1051
1052 if (page == 0x3f) {
1053 if (subpage != 0x00 && subpage != 0xff) {
1054 pr_warn("MODE_SENSE: Invalid subpage code: 0x%02x\n", subpage);
1055 return TCM_INVALID_CDB_FIELD;
1056 }
1057
1058 for (i = 0; i < ARRAY_SIZE(modesense_handlers); ++i) {
1059 /*
1060 * Tricky way to say all subpage 00h for
1061 * subpage==0, all subpages for subpage==0xff
1062 * (and we just checked above that those are
1063 * the only two possibilities).
1064 */
1065 if ((modesense_handlers[i].subpage & ~subpage) == 0) {
1066 ret = modesense_handlers[i].emulate(cmd, pc, &buf[length]);
1067 if (!ten && length + ret >= 255)
1068 break;
1069 length += ret;
1070 }
1071 }
1072
1073 goto set_length;
1074 }
1075
1076 for (i = 0; i < ARRAY_SIZE(modesense_handlers); ++i)
1077 if (modesense_handlers[i].page == page &&
1078 modesense_handlers[i].subpage == subpage) {
1079 length += modesense_handlers[i].emulate(cmd, pc, &buf[length]);
1080 goto set_length;
1081 }
1082
1083 /*
1084 * We don't intend to implement:
1085 * - obsolete page 03h "format parameters" (checked by Solaris)
1086 */
1087 if (page != 0x03)
1088 pr_err("MODE SENSE: unimplemented page/subpage: 0x%02x/0x%02x\n",
1089 page, subpage);
1090
1091 return TCM_UNKNOWN_MODE_PAGE;
1092
1093set_length:
1094 if (ten)
1095 put_unaligned_be16(length - 2, buf);
1096 else
1097 buf[0] = length - 1;
1098
1099 rbuf = transport_kmap_data_sg(cmd);
1100 if (rbuf) {
1101 memcpy(rbuf, buf, min_t(u32, SE_MODE_PAGE_BUF, cmd->data_length));
1102 transport_kunmap_data_sg(cmd);
1103 }
1104
1105 target_complete_cmd_with_length(cmd, GOOD, length);
1106 return 0;
1107}
1108
1109static sense_reason_t spc_emulate_modeselect(struct se_cmd *cmd)
1110{
1111 char *cdb = cmd->t_task_cdb;
1112 bool ten = cdb[0] == MODE_SELECT_10;
1113 int off = ten ? 8 : 4;
1114 bool pf = !!(cdb[1] & 0x10);
1115 u8 page, subpage;
1116 unsigned char *buf;
1117 unsigned char tbuf[SE_MODE_PAGE_BUF];
1118 int length;
1119 sense_reason_t ret = 0;
1120 int i;
1121
1122 if (!cmd->data_length) {
1123 target_complete_cmd(cmd, GOOD);
1124 return 0;
1125 }
1126
1127 if (cmd->data_length < off + 2)
1128 return TCM_PARAMETER_LIST_LENGTH_ERROR;
1129
1130 buf = transport_kmap_data_sg(cmd);
1131 if (!buf)
1132 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1133
1134 if (!pf) {
1135 ret = TCM_INVALID_CDB_FIELD;
1136 goto out;
1137 }
1138
1139 page = buf[off] & 0x3f;
1140 subpage = buf[off] & 0x40 ? buf[off + 1] : 0;
1141
1142 for (i = 0; i < ARRAY_SIZE(modesense_handlers); ++i)
1143 if (modesense_handlers[i].page == page &&
1144 modesense_handlers[i].subpage == subpage) {
1145 memset(tbuf, 0, SE_MODE_PAGE_BUF);
1146 length = modesense_handlers[i].emulate(cmd, 0, tbuf);
1147 goto check_contents;
1148 }
1149
1150 ret = TCM_UNKNOWN_MODE_PAGE;
1151 goto out;
1152
1153check_contents:
1154 if (cmd->data_length < off + length) {
1155 ret = TCM_PARAMETER_LIST_LENGTH_ERROR;
1156 goto out;
1157 }
1158
1159 if (memcmp(buf + off, tbuf, length))
1160 ret = TCM_INVALID_PARAMETER_LIST;
1161
1162out:
1163 transport_kunmap_data_sg(cmd);
1164
1165 if (!ret)
1166 target_complete_cmd(cmd, GOOD);
1167 return ret;
1168}
1169
1170static sense_reason_t spc_emulate_request_sense(struct se_cmd *cmd)
1171{
1172 unsigned char *cdb = cmd->t_task_cdb;
1173 unsigned char *rbuf;
1174 u8 ua_asc = 0, ua_ascq = 0;
1175 unsigned char buf[SE_SENSE_BUF];
1176 bool desc_format = target_sense_desc_format(cmd->se_dev);
1177
1178 memset(buf, 0, SE_SENSE_BUF);
1179
1180 if (cdb[1] & 0x01) {
1181 pr_err("REQUEST_SENSE description emulation not"
1182 " supported\n");
1183 return TCM_INVALID_CDB_FIELD;
1184 }
1185
1186 rbuf = transport_kmap_data_sg(cmd);
1187 if (!rbuf)
1188 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1189
1190 if (!core_scsi3_ua_clear_for_request_sense(cmd, &ua_asc, &ua_ascq))
1191 scsi_build_sense_buffer(desc_format, buf, UNIT_ATTENTION,
1192 ua_asc, ua_ascq);
1193 else
1194 scsi_build_sense_buffer(desc_format, buf, NO_SENSE, 0x0, 0x0);
1195
1196 memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length));
1197 transport_kunmap_data_sg(cmd);
1198
1199 target_complete_cmd(cmd, GOOD);
1200 return 0;
1201}
1202
1203sense_reason_t spc_emulate_report_luns(struct se_cmd *cmd)
1204{
1205 struct se_dev_entry *deve;
1206 struct se_session *sess = cmd->se_sess;
1207 struct se_node_acl *nacl;
1208 struct scsi_lun slun;
1209 unsigned char *buf;
1210 u32 lun_count = 0, offset = 8;
1211 __be32 len;
1212
1213 buf = transport_kmap_data_sg(cmd);
1214 if (cmd->data_length && !buf)
1215 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1216
1217 /*
1218 * If no struct se_session pointer is present, this struct se_cmd is
1219 * coming via a target_core_mod PASSTHROUGH op, and not through
1220 * a $FABRIC_MOD. In that case, report LUN=0 only.
1221 */
1222 if (!sess)
1223 goto done;
1224
1225 nacl = sess->se_node_acl;
1226
1227 rcu_read_lock();
1228 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
1229 /*
1230 * We determine the correct LUN LIST LENGTH even once we
1231 * have reached the initial allocation length.
1232 * See SPC2-R20 7.19.
1233 */
1234 lun_count++;
1235 if (offset >= cmd->data_length)
1236 continue;
1237
1238 int_to_scsilun(deve->mapped_lun, &slun);
1239 memcpy(buf + offset, &slun,
1240 min(8u, cmd->data_length - offset));
1241 offset += 8;
1242 }
1243 rcu_read_unlock();
1244
1245 /*
1246 * See SPC3 r07, page 159.
1247 */
1248done:
1249 /*
1250 * If no LUNs are accessible, report virtual LUN 0.
1251 */
1252 if (lun_count == 0) {
1253 int_to_scsilun(0, &slun);
1254 if (cmd->data_length > 8)
1255 memcpy(buf + offset, &slun,
1256 min(8u, cmd->data_length - offset));
1257 lun_count = 1;
1258 }
1259
1260 if (buf) {
1261 len = cpu_to_be32(lun_count * 8);
1262 memcpy(buf, &len, min_t(int, sizeof len, cmd->data_length));
1263 transport_kunmap_data_sg(cmd);
1264 }
1265
1266 target_complete_cmd_with_length(cmd, GOOD, 8 + lun_count * 8);
1267 return 0;
1268}
1269EXPORT_SYMBOL(spc_emulate_report_luns);
1270
1271static sense_reason_t
1272spc_emulate_testunitready(struct se_cmd *cmd)
1273{
1274 target_complete_cmd(cmd, GOOD);
1275 return 0;
1276}
1277
1278sense_reason_t
1279spc_parse_cdb(struct se_cmd *cmd, unsigned int *size)
1280{
1281 struct se_device *dev = cmd->se_dev;
1282 unsigned char *cdb = cmd->t_task_cdb;
1283
1284 switch (cdb[0]) {
1285 case MODE_SELECT:
1286 *size = cdb[4];
1287 cmd->execute_cmd = spc_emulate_modeselect;
1288 break;
1289 case MODE_SELECT_10:
1290 *size = get_unaligned_be16(&cdb[7]);
1291 cmd->execute_cmd = spc_emulate_modeselect;
1292 break;
1293 case MODE_SENSE:
1294 *size = cdb[4];
1295 cmd->execute_cmd = spc_emulate_modesense;
1296 break;
1297 case MODE_SENSE_10:
1298 *size = get_unaligned_be16(&cdb[7]);
1299 cmd->execute_cmd = spc_emulate_modesense;
1300 break;
1301 case LOG_SELECT:
1302 case LOG_SENSE:
1303 *size = get_unaligned_be16(&cdb[7]);
1304 break;
1305 case PERSISTENT_RESERVE_IN:
1306 *size = get_unaligned_be16(&cdb[7]);
1307 cmd->execute_cmd = target_scsi3_emulate_pr_in;
1308 break;
1309 case PERSISTENT_RESERVE_OUT:
1310 *size = get_unaligned_be32(&cdb[5]);
1311 cmd->execute_cmd = target_scsi3_emulate_pr_out;
1312 break;
1313 case RELEASE:
1314 case RELEASE_10:
1315 if (cdb[0] == RELEASE_10)
1316 *size = get_unaligned_be16(&cdb[7]);
1317 else
1318 *size = cmd->data_length;
1319
1320 cmd->execute_cmd = target_scsi2_reservation_release;
1321 break;
1322 case RESERVE:
1323 case RESERVE_10:
1324 /*
1325 * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
1326 * Assume the passthrough or $FABRIC_MOD will tell us about it.
1327 */
1328 if (cdb[0] == RESERVE_10)
1329 *size = get_unaligned_be16(&cdb[7]);
1330 else
1331 *size = cmd->data_length;
1332
1333 cmd->execute_cmd = target_scsi2_reservation_reserve;
1334 break;
1335 case REQUEST_SENSE:
1336 *size = cdb[4];
1337 cmd->execute_cmd = spc_emulate_request_sense;
1338 break;
1339 case INQUIRY:
1340 *size = get_unaligned_be16(&cdb[3]);
1341
1342 /*
1343 * Do implicit HEAD_OF_QUEUE processing for INQUIRY.
1344 * See spc4r17 section 5.3
1345 */
1346 cmd->sam_task_attr = TCM_HEAD_TAG;
1347 cmd->execute_cmd = spc_emulate_inquiry;
1348 break;
1349 case SECURITY_PROTOCOL_IN:
1350 case SECURITY_PROTOCOL_OUT:
1351 *size = get_unaligned_be32(&cdb[6]);
1352 break;
1353 case EXTENDED_COPY:
1354 *size = get_unaligned_be32(&cdb[10]);
1355 cmd->execute_cmd = target_do_xcopy;
1356 break;
1357 case RECEIVE_COPY_RESULTS:
1358 *size = get_unaligned_be32(&cdb[10]);
1359 cmd->execute_cmd = target_do_receive_copy_results;
1360 break;
1361 case READ_ATTRIBUTE:
1362 case WRITE_ATTRIBUTE:
1363 *size = get_unaligned_be32(&cdb[10]);
1364 break;
1365 case RECEIVE_DIAGNOSTIC:
1366 case SEND_DIAGNOSTIC:
1367 *size = get_unaligned_be16(&cdb[3]);
1368 break;
1369 case WRITE_BUFFER:
1370 *size = get_unaligned_be24(&cdb[6]);
1371 break;
1372 case REPORT_LUNS:
1373 cmd->execute_cmd = spc_emulate_report_luns;
1374 *size = get_unaligned_be32(&cdb[6]);
1375 /*
1376 * Do implicit HEAD_OF_QUEUE processing for REPORT_LUNS
1377 * See spc4r17 section 5.3
1378 */
1379 cmd->sam_task_attr = TCM_HEAD_TAG;
1380 break;
1381 case TEST_UNIT_READY:
1382 cmd->execute_cmd = spc_emulate_testunitready;
1383 *size = 0;
1384 break;
1385 case MAINTENANCE_IN:
1386 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
1387 /*
1388 * MAINTENANCE_IN from SCC-2
1389 * Check for emulated MI_REPORT_TARGET_PGS
1390 */
1391 if ((cdb[1] & 0x1f) == MI_REPORT_TARGET_PGS) {
1392 cmd->execute_cmd =
1393 target_emulate_report_target_port_groups;
1394 }
1395 *size = get_unaligned_be32(&cdb[6]);
1396 } else {
1397 /*
1398 * GPCMD_SEND_KEY from multi media commands
1399 */
1400 *size = get_unaligned_be16(&cdb[8]);
1401 }
1402 break;
1403 case MAINTENANCE_OUT:
1404 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
1405 /*
1406 * MAINTENANCE_OUT from SCC-2
1407 * Check for emulated MO_SET_TARGET_PGS.
1408 */
1409 if (cdb[1] == MO_SET_TARGET_PGS) {
1410 cmd->execute_cmd =
1411 target_emulate_set_target_port_groups;
1412 }
1413 *size = get_unaligned_be32(&cdb[6]);
1414 } else {
1415 /*
1416 * GPCMD_SEND_KEY from multi media commands
1417 */
1418 *size = get_unaligned_be16(&cdb[8]);
1419 }
1420 break;
1421 default:
1422 return TCM_UNSUPPORTED_SCSI_OPCODE;
1423 }
1424
1425 return 0;
1426}
1427EXPORT_SYMBOL(spc_parse_cdb);