1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * SCSI Primary Commands (SPC) parsing and emulation.
4 *
5 * (c) Copyright 2002-2013 Datera, Inc.
6 *
7 * Nicholas A. Bellinger <nab@kernel.org>
8 */
9
10 #include <linux/kernel.h>
11 #include <linux/module.h>
12 #include <asm/unaligned.h>
13
14 #include <scsi/scsi_proto.h>
15 #include <scsi/scsi_common.h>
16 #include <scsi/scsi_tcq.h>
17
18 #include <target/target_core_base.h>
19 #include <target/target_core_backend.h>
20 #include <target/target_core_fabric.h>
21
22 #include "target_core_internal.h"
23 #include "target_core_alua.h"
24 #include "target_core_pr.h"
25 #include "target_core_ua.h"
26 #include "target_core_xcopy.h"
27
spc_fill_alua_data(struct se_lun * lun,unsigned char * buf)28 static void spc_fill_alua_data(struct se_lun *lun, unsigned char *buf)
29 {
30 struct t10_alua_tg_pt_gp *tg_pt_gp;
31
32 /*
33 * Set SCCS for MAINTENANCE_IN + REPORT_TARGET_PORT_GROUPS.
34 */
35 buf[5] = 0x80;
36
37 /*
38 * Set TPGS field for explicit and/or implicit ALUA access type
39 * and opteration.
40 *
41 * See spc4r17 section 6.4.2 Table 135
42 */
43 spin_lock(&lun->lun_tg_pt_gp_lock);
44 tg_pt_gp = lun->lun_tg_pt_gp;
45 if (tg_pt_gp)
46 buf[5] |= tg_pt_gp->tg_pt_gp_alua_access_type;
47 spin_unlock(&lun->lun_tg_pt_gp_lock);
48 }
49
50 static u16
spc_find_scsi_transport_vd(int proto_id)51 spc_find_scsi_transport_vd(int proto_id)
52 {
53 switch (proto_id) {
54 case SCSI_PROTOCOL_FCP:
55 return SCSI_VERSION_DESCRIPTOR_FCP4;
56 case SCSI_PROTOCOL_ISCSI:
57 return SCSI_VERSION_DESCRIPTOR_ISCSI;
58 case SCSI_PROTOCOL_SAS:
59 return SCSI_VERSION_DESCRIPTOR_SAS3;
60 case SCSI_PROTOCOL_SBP:
61 return SCSI_VERSION_DESCRIPTOR_SBP3;
62 case SCSI_PROTOCOL_SRP:
63 return SCSI_VERSION_DESCRIPTOR_SRP;
64 default:
65 pr_warn("Cannot find VERSION DESCRIPTOR value for unknown SCSI"
66 " transport PROTOCOL IDENTIFIER %#x\n", proto_id);
67 return 0;
68 }
69 }
70
71 sense_reason_t
spc_emulate_inquiry_std(struct se_cmd * cmd,unsigned char * buf)72 spc_emulate_inquiry_std(struct se_cmd *cmd, unsigned char *buf)
73 {
74 struct se_lun *lun = cmd->se_lun;
75 struct se_portal_group *tpg = lun->lun_tpg;
76 struct se_device *dev = cmd->se_dev;
77 struct se_session *sess = cmd->se_sess;
78
79 /* Set RMB (removable media) for tape devices */
80 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
81 buf[1] = 0x80;
82
83 buf[2] = 0x06; /* SPC-4 */
84
85 /*
86 * NORMACA and HISUP = 0, RESPONSE DATA FORMAT = 2
87 *
88 * SPC4 says:
89 * A RESPONSE DATA FORMAT field set to 2h indicates that the
90 * standard INQUIRY data is in the format defined in this
91 * standard. Response data format values less than 2h are
92 * obsolete. Response data format values greater than 2h are
93 * reserved.
94 */
95 buf[3] = 2;
96
97 /*
98 * Enable SCCS and TPGS fields for Emulated ALUA
99 */
100 spc_fill_alua_data(lun, buf);
101
102 /*
103 * Set Third-Party Copy (3PC) bit to indicate support for EXTENDED_COPY
104 */
105 if (dev->dev_attrib.emulate_3pc)
106 buf[5] |= 0x8;
107 /*
108 * Set Protection (PROTECT) bit when DIF has been enabled on the
109 * device, and the fabric supports VERIFY + PASS. Also report
110 * PROTECT=1 if sess_prot_type has been configured to allow T10-PI
111 * to unprotected devices.
112 */
113 if (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) {
114 if (dev->dev_attrib.pi_prot_type || cmd->se_sess->sess_prot_type)
115 buf[5] |= 0x1;
116 }
117
118 buf[7] = 0x2; /* CmdQue=1 */
119
120 /*
121 * ASCII data fields described as being left-aligned shall have any
122 * unused bytes at the end of the field (i.e., highest offset) and the
123 * unused bytes shall be filled with ASCII space characters (20h).
124 */
125 memset(&buf[8], 0x20,
126 INQUIRY_VENDOR_LEN + INQUIRY_MODEL_LEN + INQUIRY_REVISION_LEN);
127 memcpy(&buf[8], dev->t10_wwn.vendor,
128 strnlen(dev->t10_wwn.vendor, INQUIRY_VENDOR_LEN));
129 memcpy(&buf[16], dev->t10_wwn.model,
130 strnlen(dev->t10_wwn.model, INQUIRY_MODEL_LEN));
131 memcpy(&buf[32], dev->t10_wwn.revision,
132 strnlen(dev->t10_wwn.revision, INQUIRY_REVISION_LEN));
133
134 /*
135 * Set the VERSION DESCRIPTOR fields
136 */
137 put_unaligned_be16(SCSI_VERSION_DESCRIPTOR_SAM5, &buf[58]);
138 put_unaligned_be16(spc_find_scsi_transport_vd(tpg->proto_id), &buf[60]);
139 put_unaligned_be16(SCSI_VERSION_DESCRIPTOR_SPC4, &buf[62]);
140 if (cmd->se_dev->transport->get_device_type(dev) == TYPE_DISK)
141 put_unaligned_be16(SCSI_VERSION_DESCRIPTOR_SBC3, &buf[64]);
142
143 buf[4] = 91; /* Set additional length to 91 */
144
145 return 0;
146 }
147 EXPORT_SYMBOL(spc_emulate_inquiry_std);
148
149 /* unit serial number */
150 static sense_reason_t
spc_emulate_evpd_80(struct se_cmd * cmd,unsigned char * buf)151 spc_emulate_evpd_80(struct se_cmd *cmd, unsigned char *buf)
152 {
153 struct se_device *dev = cmd->se_dev;
154 u16 len;
155
156 if (dev->dev_flags & DF_EMULATED_VPD_UNIT_SERIAL) {
157 len = sprintf(&buf[4], "%s", dev->t10_wwn.unit_serial);
158 len++; /* Extra Byte for NULL Terminator */
159 buf[3] = len;
160 }
161 return 0;
162 }
163
164 /*
165 * Generate NAA IEEE Registered Extended designator
166 */
spc_gen_naa_6h_vendor_specific(struct se_device * dev,unsigned char * buf)167 void spc_gen_naa_6h_vendor_specific(struct se_device *dev,
168 unsigned char *buf)
169 {
170 unsigned char *p = &dev->t10_wwn.unit_serial[0];
171 u32 company_id = dev->t10_wwn.company_id;
172 int cnt, off = 0;
173 bool next = true;
174
175 /*
176 * Start NAA IEEE Registered Extended Identifier/Designator
177 */
178 buf[off] = 0x6 << 4;
179
180 /* IEEE COMPANY_ID */
181 buf[off++] |= (company_id >> 20) & 0xf;
182 buf[off++] = (company_id >> 12) & 0xff;
183 buf[off++] = (company_id >> 4) & 0xff;
184 buf[off] = (company_id & 0xf) << 4;
185
186 /*
187 * Generate up to 36 bits of VENDOR SPECIFIC IDENTIFIER starting on
188 * byte 3 bit 3-0 for NAA IEEE Registered Extended DESIGNATOR field
189 * format, followed by 64 bits of VENDOR SPECIFIC IDENTIFIER EXTENSION
190 * to complete the payload. These are based from VPD=0x80 PRODUCT SERIAL
191 * NUMBER set via vpd_unit_serial in target_core_configfs.c to ensure
192 * per device uniqeness.
193 */
194 for (cnt = off + 13; *p && off < cnt; p++) {
195 int val = hex_to_bin(*p);
196
197 if (val < 0)
198 continue;
199
200 if (next) {
201 next = false;
202 buf[off++] |= val;
203 } else {
204 next = true;
205 buf[off] = val << 4;
206 }
207 }
208 }
209
210 /*
211 * Device identification VPD, for a complete list of
212 * DESIGNATOR TYPEs see spc4r17 Table 459.
213 */
214 sense_reason_t
spc_emulate_evpd_83(struct se_cmd * cmd,unsigned char * buf)215 spc_emulate_evpd_83(struct se_cmd *cmd, unsigned char *buf)
216 {
217 struct se_device *dev = cmd->se_dev;
218 struct se_lun *lun = cmd->se_lun;
219 struct se_portal_group *tpg = NULL;
220 struct t10_alua_lu_gp_member *lu_gp_mem;
221 struct t10_alua_tg_pt_gp *tg_pt_gp;
222 unsigned char *prod = &dev->t10_wwn.model[0];
223 u32 prod_len;
224 u32 unit_serial_len, off = 0;
225 u16 len = 0, id_len;
226
227 off = 4;
228
229 /*
230 * NAA IEEE Registered Extended Assigned designator format, see
231 * spc4r17 section 7.7.3.6.5
232 *
233 * We depend upon a target_core_mod/ConfigFS provided
234 * /sys/kernel/config/target/core/$HBA/$DEV/wwn/vpd_unit_serial
235 * value in order to return the NAA id.
236 */
237 if (!(dev->dev_flags & DF_EMULATED_VPD_UNIT_SERIAL))
238 goto check_t10_vend_desc;
239
240 /* CODE SET == Binary */
241 buf[off++] = 0x1;
242
243 /* Set ASSOCIATION == addressed logical unit: 0)b */
244 buf[off] = 0x00;
245
246 /* Identifier/Designator type == NAA identifier */
247 buf[off++] |= 0x3;
248 off++;
249
250 /* Identifier/Designator length */
251 buf[off++] = 0x10;
252
253 /* NAA IEEE Registered Extended designator */
254 spc_gen_naa_6h_vendor_specific(dev, &buf[off]);
255
256 len = 20;
257 off = (len + 4);
258
259 check_t10_vend_desc:
260 /*
261 * T10 Vendor Identifier Page, see spc4r17 section 7.7.3.4
262 */
263 id_len = 8; /* For Vendor field */
264 prod_len = 4; /* For VPD Header */
265 prod_len += 8; /* For Vendor field */
266 prod_len += strlen(prod);
267 prod_len++; /* For : */
268
269 if (dev->dev_flags & DF_EMULATED_VPD_UNIT_SERIAL) {
270 unit_serial_len = strlen(&dev->t10_wwn.unit_serial[0]);
271 unit_serial_len++; /* For NULL Terminator */
272
273 id_len += sprintf(&buf[off+12], "%s:%s", prod,
274 &dev->t10_wwn.unit_serial[0]);
275 }
276 buf[off] = 0x2; /* ASCII */
277 buf[off+1] = 0x1; /* T10 Vendor ID */
278 buf[off+2] = 0x0;
279 /* left align Vendor ID and pad with spaces */
280 memset(&buf[off+4], 0x20, INQUIRY_VENDOR_LEN);
281 memcpy(&buf[off+4], dev->t10_wwn.vendor,
282 strnlen(dev->t10_wwn.vendor, INQUIRY_VENDOR_LEN));
283 /* Extra Byte for NULL Terminator */
284 id_len++;
285 /* Identifier Length */
286 buf[off+3] = id_len;
287 /* Header size for Designation descriptor */
288 len += (id_len + 4);
289 off += (id_len + 4);
290
291 if (1) {
292 struct t10_alua_lu_gp *lu_gp;
293 u32 padding, scsi_name_len, scsi_target_len;
294 u16 lu_gp_id = 0;
295 u16 tg_pt_gp_id = 0;
296 u16 tpgt;
297
298 tpg = lun->lun_tpg;
299 /*
300 * Relative target port identifer, see spc4r17
301 * section 7.7.3.7
302 *
303 * Get the PROTOCOL IDENTIFIER as defined by spc4r17
304 * section 7.5.1 Table 362
305 */
306 buf[off] = tpg->proto_id << 4;
307 buf[off++] |= 0x1; /* CODE SET == Binary */
308 buf[off] = 0x80; /* Set PIV=1 */
309 /* Set ASSOCIATION == target port: 01b */
310 buf[off] |= 0x10;
311 /* DESIGNATOR TYPE == Relative target port identifer */
312 buf[off++] |= 0x4;
313 off++; /* Skip over Reserved */
314 buf[off++] = 4; /* DESIGNATOR LENGTH */
315 /* Skip over Obsolete field in RTPI payload
316 * in Table 472 */
317 off += 2;
318 put_unaligned_be16(lun->lun_rtpi, &buf[off]);
319 off += 2;
320 len += 8; /* Header size + Designation descriptor */
321 /*
322 * Target port group identifier, see spc4r17
323 * section 7.7.3.8
324 *
325 * Get the PROTOCOL IDENTIFIER as defined by spc4r17
326 * section 7.5.1 Table 362
327 */
328 spin_lock(&lun->lun_tg_pt_gp_lock);
329 tg_pt_gp = lun->lun_tg_pt_gp;
330 if (!tg_pt_gp) {
331 spin_unlock(&lun->lun_tg_pt_gp_lock);
332 goto check_lu_gp;
333 }
334 tg_pt_gp_id = tg_pt_gp->tg_pt_gp_id;
335 spin_unlock(&lun->lun_tg_pt_gp_lock);
336
337 buf[off] = tpg->proto_id << 4;
338 buf[off++] |= 0x1; /* CODE SET == Binary */
339 buf[off] = 0x80; /* Set PIV=1 */
340 /* Set ASSOCIATION == target port: 01b */
341 buf[off] |= 0x10;
342 /* DESIGNATOR TYPE == Target port group identifier */
343 buf[off++] |= 0x5;
344 off++; /* Skip over Reserved */
345 buf[off++] = 4; /* DESIGNATOR LENGTH */
346 off += 2; /* Skip over Reserved Field */
347 put_unaligned_be16(tg_pt_gp_id, &buf[off]);
348 off += 2;
349 len += 8; /* Header size + Designation descriptor */
350 /*
351 * Logical Unit Group identifier, see spc4r17
352 * section 7.7.3.8
353 */
354 check_lu_gp:
355 lu_gp_mem = dev->dev_alua_lu_gp_mem;
356 if (!lu_gp_mem)
357 goto check_scsi_name;
358
359 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
360 lu_gp = lu_gp_mem->lu_gp;
361 if (!lu_gp) {
362 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
363 goto check_scsi_name;
364 }
365 lu_gp_id = lu_gp->lu_gp_id;
366 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
367
368 buf[off++] |= 0x1; /* CODE SET == Binary */
369 /* DESIGNATOR TYPE == Logical Unit Group identifier */
370 buf[off++] |= 0x6;
371 off++; /* Skip over Reserved */
372 buf[off++] = 4; /* DESIGNATOR LENGTH */
373 off += 2; /* Skip over Reserved Field */
374 put_unaligned_be16(lu_gp_id, &buf[off]);
375 off += 2;
376 len += 8; /* Header size + Designation descriptor */
377 /*
378 * SCSI name string designator, see spc4r17
379 * section 7.7.3.11
380 *
381 * Get the PROTOCOL IDENTIFIER as defined by spc4r17
382 * section 7.5.1 Table 362
383 */
384 check_scsi_name:
385 buf[off] = tpg->proto_id << 4;
386 buf[off++] |= 0x3; /* CODE SET == UTF-8 */
387 buf[off] = 0x80; /* Set PIV=1 */
388 /* Set ASSOCIATION == target port: 01b */
389 buf[off] |= 0x10;
390 /* DESIGNATOR TYPE == SCSI name string */
391 buf[off++] |= 0x8;
392 off += 2; /* Skip over Reserved and length */
393 /*
394 * SCSI name string identifer containing, $FABRIC_MOD
395 * dependent information. For LIO-Target and iSCSI
396 * Target Port, this means "<iSCSI name>,t,0x<TPGT> in
397 * UTF-8 encoding.
398 */
399 tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg);
400 scsi_name_len = sprintf(&buf[off], "%s,t,0x%04x",
401 tpg->se_tpg_tfo->tpg_get_wwn(tpg), tpgt);
402 scsi_name_len += 1 /* Include NULL terminator */;
403 /*
404 * The null-terminated, null-padded (see 4.4.2) SCSI
405 * NAME STRING field contains a UTF-8 format string.
406 * The number of bytes in the SCSI NAME STRING field
407 * (i.e., the value in the DESIGNATOR LENGTH field)
408 * shall be no larger than 256 and shall be a multiple
409 * of four.
410 */
411 padding = ((-scsi_name_len) & 3);
412 if (padding)
413 scsi_name_len += padding;
414 if (scsi_name_len > 256)
415 scsi_name_len = 256;
416
417 buf[off-1] = scsi_name_len;
418 off += scsi_name_len;
419 /* Header size + Designation descriptor */
420 len += (scsi_name_len + 4);
421
422 /*
423 * Target device designator
424 */
425 buf[off] = tpg->proto_id << 4;
426 buf[off++] |= 0x3; /* CODE SET == UTF-8 */
427 buf[off] = 0x80; /* Set PIV=1 */
428 /* Set ASSOCIATION == target device: 10b */
429 buf[off] |= 0x20;
430 /* DESIGNATOR TYPE == SCSI name string */
431 buf[off++] |= 0x8;
432 off += 2; /* Skip over Reserved and length */
433 /*
434 * SCSI name string identifer containing, $FABRIC_MOD
435 * dependent information. For LIO-Target and iSCSI
436 * Target Port, this means "<iSCSI name>" in
437 * UTF-8 encoding.
438 */
439 scsi_target_len = sprintf(&buf[off], "%s",
440 tpg->se_tpg_tfo->tpg_get_wwn(tpg));
441 scsi_target_len += 1 /* Include NULL terminator */;
442 /*
443 * The null-terminated, null-padded (see 4.4.2) SCSI
444 * NAME STRING field contains a UTF-8 format string.
445 * The number of bytes in the SCSI NAME STRING field
446 * (i.e., the value in the DESIGNATOR LENGTH field)
447 * shall be no larger than 256 and shall be a multiple
448 * of four.
449 */
450 padding = ((-scsi_target_len) & 3);
451 if (padding)
452 scsi_target_len += padding;
453 if (scsi_target_len > 256)
454 scsi_target_len = 256;
455
456 buf[off-1] = scsi_target_len;
457 off += scsi_target_len;
458
459 /* Header size + Designation descriptor */
460 len += (scsi_target_len + 4);
461 }
462 put_unaligned_be16(len, &buf[2]); /* Page Length for VPD 0x83 */
463 return 0;
464 }
465 EXPORT_SYMBOL(spc_emulate_evpd_83);
466
467 /* Extended INQUIRY Data VPD Page */
468 static sense_reason_t
spc_emulate_evpd_86(struct se_cmd * cmd,unsigned char * buf)469 spc_emulate_evpd_86(struct se_cmd *cmd, unsigned char *buf)
470 {
471 struct se_device *dev = cmd->se_dev;
472 struct se_session *sess = cmd->se_sess;
473
474 buf[3] = 0x3c;
475 /*
476 * Set GRD_CHK + REF_CHK for TYPE1 protection, or GRD_CHK
477 * only for TYPE3 protection.
478 */
479 if (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) {
480 if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE1_PROT ||
481 cmd->se_sess->sess_prot_type == TARGET_DIF_TYPE1_PROT)
482 buf[4] = 0x5;
483 else if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE3_PROT ||
484 cmd->se_sess->sess_prot_type == TARGET_DIF_TYPE3_PROT)
485 buf[4] = 0x4;
486 }
487
488 /* logical unit supports type 1 and type 3 protection */
489 if ((dev->transport->get_device_type(dev) == TYPE_DISK) &&
490 (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) &&
491 (dev->dev_attrib.pi_prot_type || cmd->se_sess->sess_prot_type)) {
492 buf[4] |= (0x3 << 3);
493 }
494
495 /* Set HEADSUP, ORDSUP, SIMPSUP */
496 buf[5] = 0x07;
497
498 /* If WriteCache emulation is enabled, set V_SUP */
499 if (target_check_wce(dev))
500 buf[6] = 0x01;
501 /* If an LBA map is present set R_SUP */
502 spin_lock(&cmd->se_dev->t10_alua.lba_map_lock);
503 if (!list_empty(&dev->t10_alua.lba_map_list))
504 buf[8] = 0x10;
505 spin_unlock(&cmd->se_dev->t10_alua.lba_map_lock);
506 return 0;
507 }
508
509 /* Block Limits VPD page */
510 static sense_reason_t
spc_emulate_evpd_b0(struct se_cmd * cmd,unsigned char * buf)511 spc_emulate_evpd_b0(struct se_cmd *cmd, unsigned char *buf)
512 {
513 struct se_device *dev = cmd->se_dev;
514 u32 mtl = 0;
515 int have_tp = 0, opt, min;
516
517 /*
518 * Following spc3r22 section 6.5.3 Block Limits VPD page, when
519 * emulate_tpu=1 or emulate_tpws=1 we will be expect a
520 * different page length for Thin Provisioning.
521 */
522 if (dev->dev_attrib.emulate_tpu || dev->dev_attrib.emulate_tpws)
523 have_tp = 1;
524
525 buf[0] = dev->transport->get_device_type(dev);
526 buf[3] = have_tp ? 0x3c : 0x10;
527
528 /* Set WSNZ to 1 */
529 buf[4] = 0x01;
530 /*
531 * Set MAXIMUM COMPARE AND WRITE LENGTH
532 */
533 if (dev->dev_attrib.emulate_caw)
534 buf[5] = 0x01;
535
536 /*
537 * Set OPTIMAL TRANSFER LENGTH GRANULARITY
538 */
539 if (dev->transport->get_io_min && (min = dev->transport->get_io_min(dev)))
540 put_unaligned_be16(min / dev->dev_attrib.block_size, &buf[6]);
541 else
542 put_unaligned_be16(1, &buf[6]);
543
544 /*
545 * Set MAXIMUM TRANSFER LENGTH
546 *
547 * XXX: Currently assumes single PAGE_SIZE per scatterlist for fabrics
548 * enforcing maximum HW scatter-gather-list entry limit
549 */
550 if (cmd->se_tfo->max_data_sg_nents) {
551 mtl = (cmd->se_tfo->max_data_sg_nents * PAGE_SIZE) /
552 dev->dev_attrib.block_size;
553 }
554 put_unaligned_be32(min_not_zero(mtl, dev->dev_attrib.hw_max_sectors), &buf[8]);
555
556 /*
557 * Set OPTIMAL TRANSFER LENGTH
558 */
559 if (dev->transport->get_io_opt && (opt = dev->transport->get_io_opt(dev)))
560 put_unaligned_be32(opt / dev->dev_attrib.block_size, &buf[12]);
561 else
562 put_unaligned_be32(dev->dev_attrib.optimal_sectors, &buf[12]);
563
564 /*
565 * Exit now if we don't support TP.
566 */
567 if (!have_tp)
568 goto max_write_same;
569
570 /*
571 * Set MAXIMUM UNMAP LBA COUNT
572 */
573 put_unaligned_be32(dev->dev_attrib.max_unmap_lba_count, &buf[20]);
574
575 /*
576 * Set MAXIMUM UNMAP BLOCK DESCRIPTOR COUNT
577 */
578 put_unaligned_be32(dev->dev_attrib.max_unmap_block_desc_count,
579 &buf[24]);
580
581 /*
582 * Set OPTIMAL UNMAP GRANULARITY
583 */
584 put_unaligned_be32(dev->dev_attrib.unmap_granularity, &buf[28]);
585
586 /*
587 * UNMAP GRANULARITY ALIGNMENT
588 */
589 put_unaligned_be32(dev->dev_attrib.unmap_granularity_alignment,
590 &buf[32]);
591 if (dev->dev_attrib.unmap_granularity_alignment != 0)
592 buf[32] |= 0x80; /* Set the UGAVALID bit */
593
594 /*
595 * MAXIMUM WRITE SAME LENGTH
596 */
597 max_write_same:
598 put_unaligned_be64(dev->dev_attrib.max_write_same_len, &buf[36]);
599
600 return 0;
601 }
602
603 /* Block Device Characteristics VPD page */
604 static sense_reason_t
spc_emulate_evpd_b1(struct se_cmd * cmd,unsigned char * buf)605 spc_emulate_evpd_b1(struct se_cmd *cmd, unsigned char *buf)
606 {
607 struct se_device *dev = cmd->se_dev;
608
609 buf[0] = dev->transport->get_device_type(dev);
610 buf[3] = 0x3c;
611 buf[5] = dev->dev_attrib.is_nonrot ? 1 : 0;
612
613 return 0;
614 }
615
616 /* Thin Provisioning VPD */
617 static sense_reason_t
spc_emulate_evpd_b2(struct se_cmd * cmd,unsigned char * buf)618 spc_emulate_evpd_b2(struct se_cmd *cmd, unsigned char *buf)
619 {
620 struct se_device *dev = cmd->se_dev;
621
622 /*
623 * From spc3r22 section 6.5.4 Thin Provisioning VPD page:
624 *
625 * The PAGE LENGTH field is defined in SPC-4. If the DP bit is set to
626 * zero, then the page length shall be set to 0004h. If the DP bit
627 * is set to one, then the page length shall be set to the value
628 * defined in table 162.
629 */
630 buf[0] = dev->transport->get_device_type(dev);
631
632 /*
633 * Set Hardcoded length mentioned above for DP=0
634 */
635 put_unaligned_be16(0x0004, &buf[2]);
636
637 /*
638 * The THRESHOLD EXPONENT field indicates the threshold set size in
639 * LBAs as a power of 2 (i.e., the threshold set size is equal to
640 * 2(threshold exponent)).
641 *
642 * Note that this is currently set to 0x00 as mkp says it will be
643 * changing again. We can enable this once it has settled in T10
644 * and is actually used by Linux/SCSI ML code.
645 */
646 buf[4] = 0x00;
647
648 /*
649 * A TPU bit set to one indicates that the device server supports
650 * the UNMAP command (see 5.25). A TPU bit set to zero indicates
651 * that the device server does not support the UNMAP command.
652 */
653 if (dev->dev_attrib.emulate_tpu != 0)
654 buf[5] = 0x80;
655
656 /*
657 * A TPWS bit set to one indicates that the device server supports
658 * the use of the WRITE SAME (16) command (see 5.42) to unmap LBAs.
659 * A TPWS bit set to zero indicates that the device server does not
660 * support the use of the WRITE SAME (16) command to unmap LBAs.
661 */
662 if (dev->dev_attrib.emulate_tpws != 0)
663 buf[5] |= 0x40 | 0x20;
664
665 /*
666 * The unmap_zeroes_data set means that the underlying device supports
667 * REQ_OP_DISCARD and has the discard_zeroes_data bit set. This
668 * satisfies the SBC requirements for LBPRZ, meaning that a subsequent
669 * read will return zeroes after an UNMAP or WRITE SAME (16) to an LBA
670 * See sbc4r36 6.6.4.
671 */
672 if (((dev->dev_attrib.emulate_tpu != 0) ||
673 (dev->dev_attrib.emulate_tpws != 0)) &&
674 (dev->dev_attrib.unmap_zeroes_data != 0))
675 buf[5] |= 0x04;
676
677 return 0;
678 }
679
680 /* Referrals VPD page */
681 static sense_reason_t
spc_emulate_evpd_b3(struct se_cmd * cmd,unsigned char * buf)682 spc_emulate_evpd_b3(struct se_cmd *cmd, unsigned char *buf)
683 {
684 struct se_device *dev = cmd->se_dev;
685
686 buf[0] = dev->transport->get_device_type(dev);
687 buf[3] = 0x0c;
688 put_unaligned_be32(dev->t10_alua.lba_map_segment_size, &buf[8]);
689 put_unaligned_be32(dev->t10_alua.lba_map_segment_multiplier, &buf[12]);
690
691 return 0;
692 }
693
694 static sense_reason_t
695 spc_emulate_evpd_00(struct se_cmd *cmd, unsigned char *buf);
696
697 static struct {
698 uint8_t page;
699 sense_reason_t (*emulate)(struct se_cmd *, unsigned char *);
700 } evpd_handlers[] = {
701 { .page = 0x00, .emulate = spc_emulate_evpd_00 },
702 { .page = 0x80, .emulate = spc_emulate_evpd_80 },
703 { .page = 0x83, .emulate = spc_emulate_evpd_83 },
704 { .page = 0x86, .emulate = spc_emulate_evpd_86 },
705 { .page = 0xb0, .emulate = spc_emulate_evpd_b0 },
706 { .page = 0xb1, .emulate = spc_emulate_evpd_b1 },
707 { .page = 0xb2, .emulate = spc_emulate_evpd_b2 },
708 { .page = 0xb3, .emulate = spc_emulate_evpd_b3 },
709 };
710
711 /* supported vital product data pages */
712 static sense_reason_t
spc_emulate_evpd_00(struct se_cmd * cmd,unsigned char * buf)713 spc_emulate_evpd_00(struct se_cmd *cmd, unsigned char *buf)
714 {
715 int p;
716
717 /*
718 * Only report the INQUIRY EVPD=1 pages after a valid NAA
719 * Registered Extended LUN WWN has been set via ConfigFS
720 * during device creation/restart.
721 */
722 if (cmd->se_dev->dev_flags & DF_EMULATED_VPD_UNIT_SERIAL) {
723 buf[3] = ARRAY_SIZE(evpd_handlers);
724 for (p = 0; p < ARRAY_SIZE(evpd_handlers); ++p)
725 buf[p + 4] = evpd_handlers[p].page;
726 }
727
728 return 0;
729 }
730
731 static sense_reason_t
spc_emulate_inquiry(struct se_cmd * cmd)732 spc_emulate_inquiry(struct se_cmd *cmd)
733 {
734 struct se_device *dev = cmd->se_dev;
735 unsigned char *rbuf;
736 unsigned char *cdb = cmd->t_task_cdb;
737 unsigned char *buf;
738 sense_reason_t ret;
739 int p;
740 int len = 0;
741
742 buf = kzalloc(SE_INQUIRY_BUF, GFP_KERNEL);
743 if (!buf) {
744 pr_err("Unable to allocate response buffer for INQUIRY\n");
745 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
746 }
747
748 buf[0] = dev->transport->get_device_type(dev);
749
750 if (!(cdb[1] & 0x1)) {
751 if (cdb[2]) {
752 pr_err("INQUIRY with EVPD==0 but PAGE CODE=%02x\n",
753 cdb[2]);
754 ret = TCM_INVALID_CDB_FIELD;
755 goto out;
756 }
757
758 ret = spc_emulate_inquiry_std(cmd, buf);
759 len = buf[4] + 5;
760 goto out;
761 }
762
763 for (p = 0; p < ARRAY_SIZE(evpd_handlers); ++p) {
764 if (cdb[2] == evpd_handlers[p].page) {
765 buf[1] = cdb[2];
766 ret = evpd_handlers[p].emulate(cmd, buf);
767 len = get_unaligned_be16(&buf[2]) + 4;
768 goto out;
769 }
770 }
771
772 pr_err("Unknown VPD Code: 0x%02x\n", cdb[2]);
773 ret = TCM_INVALID_CDB_FIELD;
774
775 out:
776 rbuf = transport_kmap_data_sg(cmd);
777 if (rbuf) {
778 memcpy(rbuf, buf, min_t(u32, SE_INQUIRY_BUF, cmd->data_length));
779 transport_kunmap_data_sg(cmd);
780 }
781 kfree(buf);
782
783 if (!ret)
784 target_complete_cmd_with_length(cmd, SAM_STAT_GOOD, len);
785 return ret;
786 }
787
spc_modesense_rwrecovery(struct se_cmd * cmd,u8 pc,u8 * p)788 static int spc_modesense_rwrecovery(struct se_cmd *cmd, u8 pc, u8 *p)
789 {
790 p[0] = 0x01;
791 p[1] = 0x0a;
792
793 /* No changeable values for now */
794 if (pc == 1)
795 goto out;
796
797 out:
798 return 12;
799 }
800
spc_modesense_control(struct se_cmd * cmd,u8 pc,u8 * p)801 static int spc_modesense_control(struct se_cmd *cmd, u8 pc, u8 *p)
802 {
803 struct se_device *dev = cmd->se_dev;
804 struct se_session *sess = cmd->se_sess;
805
806 p[0] = 0x0a;
807 p[1] = 0x0a;
808
809 /* No changeable values for now */
810 if (pc == 1)
811 goto out;
812
813 /* GLTSD: No implicit save of log parameters */
814 p[2] = (1 << 1);
815 if (target_sense_desc_format(dev))
816 /* D_SENSE: Descriptor format sense data for 64bit sectors */
817 p[2] |= (1 << 2);
818
819 /*
820 * From spc4r23, 7.4.7 Control mode page
821 *
822 * The QUEUE ALGORITHM MODIFIER field (see table 368) specifies
823 * restrictions on the algorithm used for reordering commands
824 * having the SIMPLE task attribute (see SAM-4).
825 *
826 * Table 368 -- QUEUE ALGORITHM MODIFIER field
827 * Code Description
828 * 0h Restricted reordering
829 * 1h Unrestricted reordering allowed
830 * 2h to 7h Reserved
831 * 8h to Fh Vendor specific
832 *
833 * A value of zero in the QUEUE ALGORITHM MODIFIER field specifies that
834 * the device server shall order the processing sequence of commands
835 * having the SIMPLE task attribute such that data integrity is maintained
836 * for that I_T nexus (i.e., if the transmission of new SCSI transport protocol
837 * requests is halted at any time, the final value of all data observable
838 * on the medium shall be the same as if all the commands had been processed
839 * with the ORDERED task attribute).
840 *
841 * A value of one in the QUEUE ALGORITHM MODIFIER field specifies that the
842 * device server may reorder the processing sequence of commands having the
843 * SIMPLE task attribute in any manner. Any data integrity exposures related to
844 * command sequence order shall be explicitly handled by the application client
845 * through the selection of appropriate ommands and task attributes.
846 */
847 p[3] = (dev->dev_attrib.emulate_rest_reord == 1) ? 0x00 : 0x10;
848 /*
849 * From spc4r17, section 7.4.6 Control mode Page
850 *
851 * Unit Attention interlocks control (UN_INTLCK_CTRL) to code 00b
852 *
853 * 00b: The logical unit shall clear any unit attention condition
854 * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION
855 * status and shall not establish a unit attention condition when a com-
856 * mand is completed with BUSY, TASK SET FULL, or RESERVATION CONFLICT
857 * status.
858 *
859 * 10b: The logical unit shall not clear any unit attention condition
860 * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION
861 * status and shall not establish a unit attention condition when
862 * a command is completed with BUSY, TASK SET FULL, or RESERVATION
863 * CONFLICT status.
864 *
865 * 11b a The logical unit shall not clear any unit attention condition
866 * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION
867 * status and shall establish a unit attention condition for the
868 * initiator port associated with the I_T nexus on which the BUSY,
869 * TASK SET FULL, or RESERVATION CONFLICT status is being returned.
870 * Depending on the status, the additional sense code shall be set to
871 * PREVIOUS BUSY STATUS, PREVIOUS TASK SET FULL STATUS, or PREVIOUS
872 * RESERVATION CONFLICT STATUS. Until it is cleared by a REQUEST SENSE
873 * command, a unit attention condition shall be established only once
874 * for a BUSY, TASK SET FULL, or RESERVATION CONFLICT status regardless
875 * to the number of commands completed with one of those status codes.
876 */
877 switch (dev->dev_attrib.emulate_ua_intlck_ctrl) {
878 case TARGET_UA_INTLCK_CTRL_ESTABLISH_UA:
879 p[4] = 0x30;
880 break;
881 case TARGET_UA_INTLCK_CTRL_NO_CLEAR:
882 p[4] = 0x20;
883 break;
884 default: /* TARGET_UA_INTLCK_CTRL_CLEAR */
885 p[4] = 0x00;
886 break;
887 }
888 /*
889 * From spc4r17, section 7.4.6 Control mode Page
890 *
891 * Task Aborted Status (TAS) bit set to zero.
892 *
893 * A task aborted status (TAS) bit set to zero specifies that aborted
894 * tasks shall be terminated by the device server without any response
895 * to the application client. A TAS bit set to one specifies that tasks
896 * aborted by the actions of an I_T nexus other than the I_T nexus on
897 * which the command was received shall be completed with TASK ABORTED
898 * status (see SAM-4).
899 */
900 p[5] = (dev->dev_attrib.emulate_tas) ? 0x40 : 0x00;
901 /*
902 * From spc4r30, section 7.5.7 Control mode page
903 *
904 * Application Tag Owner (ATO) bit set to one.
905 *
906 * If the ATO bit is set to one the device server shall not modify the
907 * LOGICAL BLOCK APPLICATION TAG field and, depending on the protection
908 * type, shall not modify the contents of the LOGICAL BLOCK REFERENCE
909 * TAG field.
910 */
911 if (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) {
912 if (dev->dev_attrib.pi_prot_type || sess->sess_prot_type)
913 p[5] |= 0x80;
914 }
915
916 p[8] = 0xff;
917 p[9] = 0xff;
918 p[11] = 30;
919
920 out:
921 return 12;
922 }
923
spc_modesense_caching(struct se_cmd * cmd,u8 pc,u8 * p)924 static int spc_modesense_caching(struct se_cmd *cmd, u8 pc, u8 *p)
925 {
926 struct se_device *dev = cmd->se_dev;
927
928 p[0] = 0x08;
929 p[1] = 0x12;
930
931 /* No changeable values for now */
932 if (pc == 1)
933 goto out;
934
935 if (target_check_wce(dev))
936 p[2] = 0x04; /* Write Cache Enable */
937 p[12] = 0x20; /* Disabled Read Ahead */
938
939 out:
940 return 20;
941 }
942
spc_modesense_informational_exceptions(struct se_cmd * cmd,u8 pc,unsigned char * p)943 static int spc_modesense_informational_exceptions(struct se_cmd *cmd, u8 pc, unsigned char *p)
944 {
945 p[0] = 0x1c;
946 p[1] = 0x0a;
947
948 /* No changeable values for now */
949 if (pc == 1)
950 goto out;
951
952 out:
953 return 12;
954 }
955
956 static struct {
957 uint8_t page;
958 uint8_t subpage;
959 int (*emulate)(struct se_cmd *, u8, unsigned char *);
960 } modesense_handlers[] = {
961 { .page = 0x01, .subpage = 0x00, .emulate = spc_modesense_rwrecovery },
962 { .page = 0x08, .subpage = 0x00, .emulate = spc_modesense_caching },
963 { .page = 0x0a, .subpage = 0x00, .emulate = spc_modesense_control },
964 { .page = 0x1c, .subpage = 0x00, .emulate = spc_modesense_informational_exceptions },
965 };
966
spc_modesense_write_protect(unsigned char * buf,int type)967 static void spc_modesense_write_protect(unsigned char *buf, int type)
968 {
969 /*
970 * I believe that the WP bit (bit 7) in the mode header is the same for
971 * all device types..
972 */
973 switch (type) {
974 case TYPE_DISK:
975 case TYPE_TAPE:
976 default:
977 buf[0] |= 0x80; /* WP bit */
978 break;
979 }
980 }
981
spc_modesense_dpofua(unsigned char * buf,int type)982 static void spc_modesense_dpofua(unsigned char *buf, int type)
983 {
984 switch (type) {
985 case TYPE_DISK:
986 buf[0] |= 0x10; /* DPOFUA bit */
987 break;
988 default:
989 break;
990 }
991 }
992
spc_modesense_blockdesc(unsigned char * buf,u64 blocks,u32 block_size)993 static int spc_modesense_blockdesc(unsigned char *buf, u64 blocks, u32 block_size)
994 {
995 *buf++ = 8;
996 put_unaligned_be32(min(blocks, 0xffffffffull), buf);
997 buf += 4;
998 put_unaligned_be32(block_size, buf);
999 return 9;
1000 }
1001
spc_modesense_long_blockdesc(unsigned char * buf,u64 blocks,u32 block_size)1002 static int spc_modesense_long_blockdesc(unsigned char *buf, u64 blocks, u32 block_size)
1003 {
1004 if (blocks <= 0xffffffff)
1005 return spc_modesense_blockdesc(buf + 3, blocks, block_size) + 3;
1006
1007 *buf++ = 1; /* LONGLBA */
1008 buf += 2;
1009 *buf++ = 16;
1010 put_unaligned_be64(blocks, buf);
1011 buf += 12;
1012 put_unaligned_be32(block_size, buf);
1013
1014 return 17;
1015 }
1016
spc_emulate_modesense(struct se_cmd * cmd)1017 static sense_reason_t spc_emulate_modesense(struct se_cmd *cmd)
1018 {
1019 struct se_device *dev = cmd->se_dev;
1020 char *cdb = cmd->t_task_cdb;
1021 unsigned char buf[SE_MODE_PAGE_BUF], *rbuf;
1022 int type = dev->transport->get_device_type(dev);
1023 int ten = (cmd->t_task_cdb[0] == MODE_SENSE_10);
1024 bool dbd = !!(cdb[1] & 0x08);
1025 bool llba = ten ? !!(cdb[1] & 0x10) : false;
1026 u8 pc = cdb[2] >> 6;
1027 u8 page = cdb[2] & 0x3f;
1028 u8 subpage = cdb[3];
1029 int length = 0;
1030 int ret;
1031 int i;
1032
1033 memset(buf, 0, SE_MODE_PAGE_BUF);
1034
1035 /*
1036 * Skip over MODE DATA LENGTH + MEDIUM TYPE fields to byte 3 for
1037 * MODE_SENSE_10 and byte 2 for MODE_SENSE (6).
1038 */
1039 length = ten ? 3 : 2;
1040
1041 /* DEVICE-SPECIFIC PARAMETER */
1042 if (cmd->se_lun->lun_access_ro || target_lun_is_rdonly(cmd))
1043 spc_modesense_write_protect(&buf[length], type);
1044
1045 /*
1046 * SBC only allows us to enable FUA and DPO together. Fortunately
1047 * DPO is explicitly specified as a hint, so a noop is a perfectly
1048 * valid implementation.
1049 */
1050 if (target_check_fua(dev))
1051 spc_modesense_dpofua(&buf[length], type);
1052
1053 ++length;
1054
1055 /* BLOCK DESCRIPTOR */
1056
1057 /*
1058 * For now we only include a block descriptor for disk (SBC)
1059 * devices; other command sets use a slightly different format.
1060 */
1061 if (!dbd && type == TYPE_DISK) {
1062 u64 blocks = dev->transport->get_blocks(dev);
1063 u32 block_size = dev->dev_attrib.block_size;
1064
1065 if (ten) {
1066 if (llba) {
1067 length += spc_modesense_long_blockdesc(&buf[length],
1068 blocks, block_size);
1069 } else {
1070 length += 3;
1071 length += spc_modesense_blockdesc(&buf[length],
1072 blocks, block_size);
1073 }
1074 } else {
1075 length += spc_modesense_blockdesc(&buf[length], blocks,
1076 block_size);
1077 }
1078 } else {
1079 if (ten)
1080 length += 4;
1081 else
1082 length += 1;
1083 }
1084
1085 if (page == 0x3f) {
1086 if (subpage != 0x00 && subpage != 0xff) {
1087 pr_warn("MODE_SENSE: Invalid subpage code: 0x%02x\n", subpage);
1088 return TCM_INVALID_CDB_FIELD;
1089 }
1090
1091 for (i = 0; i < ARRAY_SIZE(modesense_handlers); ++i) {
1092 /*
1093 * Tricky way to say all subpage 00h for
1094 * subpage==0, all subpages for subpage==0xff
1095 * (and we just checked above that those are
1096 * the only two possibilities).
1097 */
1098 if ((modesense_handlers[i].subpage & ~subpage) == 0) {
1099 ret = modesense_handlers[i].emulate(cmd, pc, &buf[length]);
1100 if (!ten && length + ret >= 255)
1101 break;
1102 length += ret;
1103 }
1104 }
1105
1106 goto set_length;
1107 }
1108
1109 for (i = 0; i < ARRAY_SIZE(modesense_handlers); ++i)
1110 if (modesense_handlers[i].page == page &&
1111 modesense_handlers[i].subpage == subpage) {
1112 length += modesense_handlers[i].emulate(cmd, pc, &buf[length]);
1113 goto set_length;
1114 }
1115
1116 /*
1117 * We don't intend to implement:
1118 * - obsolete page 03h "format parameters" (checked by Solaris)
1119 */
1120 if (page != 0x03)
1121 pr_err("MODE SENSE: unimplemented page/subpage: 0x%02x/0x%02x\n",
1122 page, subpage);
1123
1124 return TCM_UNKNOWN_MODE_PAGE;
1125
1126 set_length:
1127 if (ten)
1128 put_unaligned_be16(length - 2, buf);
1129 else
1130 buf[0] = length - 1;
1131
1132 rbuf = transport_kmap_data_sg(cmd);
1133 if (rbuf) {
1134 memcpy(rbuf, buf, min_t(u32, SE_MODE_PAGE_BUF, cmd->data_length));
1135 transport_kunmap_data_sg(cmd);
1136 }
1137
1138 target_complete_cmd_with_length(cmd, SAM_STAT_GOOD, length);
1139 return 0;
1140 }
1141
spc_emulate_modeselect(struct se_cmd * cmd)1142 static sense_reason_t spc_emulate_modeselect(struct se_cmd *cmd)
1143 {
1144 char *cdb = cmd->t_task_cdb;
1145 bool ten = cdb[0] == MODE_SELECT_10;
1146 int off = ten ? 8 : 4;
1147 bool pf = !!(cdb[1] & 0x10);
1148 u8 page, subpage;
1149 unsigned char *buf;
1150 unsigned char tbuf[SE_MODE_PAGE_BUF];
1151 int length;
1152 sense_reason_t ret = 0;
1153 int i;
1154
1155 if (!cmd->data_length) {
1156 target_complete_cmd(cmd, SAM_STAT_GOOD);
1157 return 0;
1158 }
1159
1160 if (cmd->data_length < off + 2)
1161 return TCM_PARAMETER_LIST_LENGTH_ERROR;
1162
1163 buf = transport_kmap_data_sg(cmd);
1164 if (!buf)
1165 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1166
1167 if (!pf) {
1168 ret = TCM_INVALID_CDB_FIELD;
1169 goto out;
1170 }
1171
1172 page = buf[off] & 0x3f;
1173 subpage = buf[off] & 0x40 ? buf[off + 1] : 0;
1174
1175 for (i = 0; i < ARRAY_SIZE(modesense_handlers); ++i)
1176 if (modesense_handlers[i].page == page &&
1177 modesense_handlers[i].subpage == subpage) {
1178 memset(tbuf, 0, SE_MODE_PAGE_BUF);
1179 length = modesense_handlers[i].emulate(cmd, 0, tbuf);
1180 goto check_contents;
1181 }
1182
1183 ret = TCM_UNKNOWN_MODE_PAGE;
1184 goto out;
1185
1186 check_contents:
1187 if (cmd->data_length < off + length) {
1188 ret = TCM_PARAMETER_LIST_LENGTH_ERROR;
1189 goto out;
1190 }
1191
1192 if (memcmp(buf + off, tbuf, length))
1193 ret = TCM_INVALID_PARAMETER_LIST;
1194
1195 out:
1196 transport_kunmap_data_sg(cmd);
1197
1198 if (!ret)
1199 target_complete_cmd(cmd, SAM_STAT_GOOD);
1200 return ret;
1201 }
1202
spc_emulate_request_sense(struct se_cmd * cmd)1203 static sense_reason_t spc_emulate_request_sense(struct se_cmd *cmd)
1204 {
1205 unsigned char *cdb = cmd->t_task_cdb;
1206 unsigned char *rbuf;
1207 u8 ua_asc = 0, ua_ascq = 0;
1208 unsigned char buf[SE_SENSE_BUF];
1209 bool desc_format = target_sense_desc_format(cmd->se_dev);
1210
1211 memset(buf, 0, SE_SENSE_BUF);
1212
1213 if (cdb[1] & 0x01) {
1214 pr_err("REQUEST_SENSE description emulation not"
1215 " supported\n");
1216 return TCM_INVALID_CDB_FIELD;
1217 }
1218
1219 rbuf = transport_kmap_data_sg(cmd);
1220 if (!rbuf)
1221 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1222
1223 if (!core_scsi3_ua_clear_for_request_sense(cmd, &ua_asc, &ua_ascq))
1224 scsi_build_sense_buffer(desc_format, buf, UNIT_ATTENTION,
1225 ua_asc, ua_ascq);
1226 else
1227 scsi_build_sense_buffer(desc_format, buf, NO_SENSE, 0x0, 0x0);
1228
1229 memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length));
1230 transport_kunmap_data_sg(cmd);
1231
1232 target_complete_cmd(cmd, SAM_STAT_GOOD);
1233 return 0;
1234 }
1235
spc_emulate_report_luns(struct se_cmd * cmd)1236 sense_reason_t spc_emulate_report_luns(struct se_cmd *cmd)
1237 {
1238 struct se_dev_entry *deve;
1239 struct se_session *sess = cmd->se_sess;
1240 struct se_node_acl *nacl;
1241 struct scsi_lun slun;
1242 unsigned char *buf;
1243 u32 lun_count = 0, offset = 8;
1244 __be32 len;
1245
1246 buf = transport_kmap_data_sg(cmd);
1247 if (cmd->data_length && !buf)
1248 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1249
1250 /*
1251 * If no struct se_session pointer is present, this struct se_cmd is
1252 * coming via a target_core_mod PASSTHROUGH op, and not through
1253 * a $FABRIC_MOD. In that case, report LUN=0 only.
1254 */
1255 if (!sess)
1256 goto done;
1257
1258 nacl = sess->se_node_acl;
1259
1260 rcu_read_lock();
1261 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
1262 /*
1263 * We determine the correct LUN LIST LENGTH even once we
1264 * have reached the initial allocation length.
1265 * See SPC2-R20 7.19.
1266 */
1267 lun_count++;
1268 if (offset >= cmd->data_length)
1269 continue;
1270
1271 int_to_scsilun(deve->mapped_lun, &slun);
1272 memcpy(buf + offset, &slun,
1273 min(8u, cmd->data_length - offset));
1274 offset += 8;
1275 }
1276 rcu_read_unlock();
1277
1278 /*
1279 * See SPC3 r07, page 159.
1280 */
1281 done:
1282 /*
1283 * If no LUNs are accessible, report virtual LUN 0.
1284 */
1285 if (lun_count == 0) {
1286 int_to_scsilun(0, &slun);
1287 if (cmd->data_length > 8)
1288 memcpy(buf + offset, &slun,
1289 min(8u, cmd->data_length - offset));
1290 lun_count = 1;
1291 }
1292
1293 if (buf) {
1294 len = cpu_to_be32(lun_count * 8);
1295 memcpy(buf, &len, min_t(int, sizeof len, cmd->data_length));
1296 transport_kunmap_data_sg(cmd);
1297 }
1298
1299 target_complete_cmd_with_length(cmd, SAM_STAT_GOOD, 8 + lun_count * 8);
1300 return 0;
1301 }
1302 EXPORT_SYMBOL(spc_emulate_report_luns);
1303
1304 static sense_reason_t
spc_emulate_testunitready(struct se_cmd * cmd)1305 spc_emulate_testunitready(struct se_cmd *cmd)
1306 {
1307 target_complete_cmd(cmd, SAM_STAT_GOOD);
1308 return 0;
1309 }
1310
1311 sense_reason_t
spc_parse_cdb(struct se_cmd * cmd,unsigned int * size)1312 spc_parse_cdb(struct se_cmd *cmd, unsigned int *size)
1313 {
1314 struct se_device *dev = cmd->se_dev;
1315 unsigned char *cdb = cmd->t_task_cdb;
1316
1317 if (!dev->dev_attrib.emulate_pr &&
1318 ((cdb[0] == PERSISTENT_RESERVE_IN) ||
1319 (cdb[0] == PERSISTENT_RESERVE_OUT) ||
1320 (cdb[0] == RELEASE || cdb[0] == RELEASE_10) ||
1321 (cdb[0] == RESERVE || cdb[0] == RESERVE_10))) {
1322 return TCM_UNSUPPORTED_SCSI_OPCODE;
1323 }
1324
1325 switch (cdb[0]) {
1326 case MODE_SELECT:
1327 *size = cdb[4];
1328 cmd->execute_cmd = spc_emulate_modeselect;
1329 break;
1330 case MODE_SELECT_10:
1331 *size = get_unaligned_be16(&cdb[7]);
1332 cmd->execute_cmd = spc_emulate_modeselect;
1333 break;
1334 case MODE_SENSE:
1335 *size = cdb[4];
1336 cmd->execute_cmd = spc_emulate_modesense;
1337 break;
1338 case MODE_SENSE_10:
1339 *size = get_unaligned_be16(&cdb[7]);
1340 cmd->execute_cmd = spc_emulate_modesense;
1341 break;
1342 case LOG_SELECT:
1343 case LOG_SENSE:
1344 *size = get_unaligned_be16(&cdb[7]);
1345 break;
1346 case PERSISTENT_RESERVE_IN:
1347 *size = get_unaligned_be16(&cdb[7]);
1348 cmd->execute_cmd = target_scsi3_emulate_pr_in;
1349 break;
1350 case PERSISTENT_RESERVE_OUT:
1351 *size = get_unaligned_be32(&cdb[5]);
1352 cmd->execute_cmd = target_scsi3_emulate_pr_out;
1353 break;
1354 case RELEASE:
1355 case RELEASE_10:
1356 if (cdb[0] == RELEASE_10)
1357 *size = get_unaligned_be16(&cdb[7]);
1358 else
1359 *size = cmd->data_length;
1360
1361 cmd->execute_cmd = target_scsi2_reservation_release;
1362 break;
1363 case RESERVE:
1364 case RESERVE_10:
1365 /*
1366 * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
1367 * Assume the passthrough or $FABRIC_MOD will tell us about it.
1368 */
1369 if (cdb[0] == RESERVE_10)
1370 *size = get_unaligned_be16(&cdb[7]);
1371 else
1372 *size = cmd->data_length;
1373
1374 cmd->execute_cmd = target_scsi2_reservation_reserve;
1375 break;
1376 case REQUEST_SENSE:
1377 *size = cdb[4];
1378 cmd->execute_cmd = spc_emulate_request_sense;
1379 break;
1380 case INQUIRY:
1381 *size = get_unaligned_be16(&cdb[3]);
1382
1383 /*
1384 * Do implicit HEAD_OF_QUEUE processing for INQUIRY.
1385 * See spc4r17 section 5.3
1386 */
1387 cmd->sam_task_attr = TCM_HEAD_TAG;
1388 cmd->execute_cmd = spc_emulate_inquiry;
1389 break;
1390 case SECURITY_PROTOCOL_IN:
1391 case SECURITY_PROTOCOL_OUT:
1392 *size = get_unaligned_be32(&cdb[6]);
1393 break;
1394 case EXTENDED_COPY:
1395 *size = get_unaligned_be32(&cdb[10]);
1396 cmd->execute_cmd = target_do_xcopy;
1397 break;
1398 case RECEIVE_COPY_RESULTS:
1399 *size = get_unaligned_be32(&cdb[10]);
1400 cmd->execute_cmd = target_do_receive_copy_results;
1401 break;
1402 case READ_ATTRIBUTE:
1403 case WRITE_ATTRIBUTE:
1404 *size = get_unaligned_be32(&cdb[10]);
1405 break;
1406 case RECEIVE_DIAGNOSTIC:
1407 case SEND_DIAGNOSTIC:
1408 *size = get_unaligned_be16(&cdb[3]);
1409 break;
1410 case WRITE_BUFFER:
1411 *size = get_unaligned_be24(&cdb[6]);
1412 break;
1413 case REPORT_LUNS:
1414 cmd->execute_cmd = spc_emulate_report_luns;
1415 *size = get_unaligned_be32(&cdb[6]);
1416 /*
1417 * Do implicit HEAD_OF_QUEUE processing for REPORT_LUNS
1418 * See spc4r17 section 5.3
1419 */
1420 cmd->sam_task_attr = TCM_HEAD_TAG;
1421 break;
1422 case TEST_UNIT_READY:
1423 cmd->execute_cmd = spc_emulate_testunitready;
1424 *size = 0;
1425 break;
1426 case MAINTENANCE_IN:
1427 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
1428 /*
1429 * MAINTENANCE_IN from SCC-2
1430 * Check for emulated MI_REPORT_TARGET_PGS
1431 */
1432 if ((cdb[1] & 0x1f) == MI_REPORT_TARGET_PGS) {
1433 cmd->execute_cmd =
1434 target_emulate_report_target_port_groups;
1435 }
1436 *size = get_unaligned_be32(&cdb[6]);
1437 } else {
1438 /*
1439 * GPCMD_SEND_KEY from multi media commands
1440 */
1441 *size = get_unaligned_be16(&cdb[8]);
1442 }
1443 break;
1444 case MAINTENANCE_OUT:
1445 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
1446 /*
1447 * MAINTENANCE_OUT from SCC-2
1448 * Check for emulated MO_SET_TARGET_PGS.
1449 */
1450 if (cdb[1] == MO_SET_TARGET_PGS) {
1451 cmd->execute_cmd =
1452 target_emulate_set_target_port_groups;
1453 }
1454 *size = get_unaligned_be32(&cdb[6]);
1455 } else {
1456 /*
1457 * GPCMD_SEND_KEY from multi media commands
1458 */
1459 *size = get_unaligned_be16(&cdb[8]);
1460 }
1461 break;
1462 default:
1463 return TCM_UNSUPPORTED_SCSI_OPCODE;
1464 }
1465
1466 return 0;
1467 }
1468 EXPORT_SYMBOL(spc_parse_cdb);
1469
