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 rcu_read_lock();
44 tg_pt_gp = rcu_dereference(lun->lun_tg_pt_gp);
45 if (tg_pt_gp)
46 buf[5] |= tg_pt_gp->tg_pt_gp_alua_access_type;
47 rcu_read_unlock();
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 /*
119 * Set MULTIP bit to indicate presence of multiple SCSI target ports
120 */
121 if (dev->export_count > 1)
122 buf[6] |= 0x10;
123
124 buf[7] = 0x2; /* CmdQue=1 */
125
126 /*
127 * ASCII data fields described as being left-aligned shall have any
128 * unused bytes at the end of the field (i.e., highest offset) and the
129 * unused bytes shall be filled with ASCII space characters (20h).
130 */
131 memset(&buf[8], 0x20,
132 INQUIRY_VENDOR_LEN + INQUIRY_MODEL_LEN + INQUIRY_REVISION_LEN);
133 memcpy(&buf[8], dev->t10_wwn.vendor,
134 strnlen(dev->t10_wwn.vendor, INQUIRY_VENDOR_LEN));
135 memcpy(&buf[16], dev->t10_wwn.model,
136 strnlen(dev->t10_wwn.model, INQUIRY_MODEL_LEN));
137 memcpy(&buf[32], dev->t10_wwn.revision,
138 strnlen(dev->t10_wwn.revision, INQUIRY_REVISION_LEN));
139
140 /*
141 * Set the VERSION DESCRIPTOR fields
142 */
143 put_unaligned_be16(SCSI_VERSION_DESCRIPTOR_SAM5, &buf[58]);
144 put_unaligned_be16(spc_find_scsi_transport_vd(tpg->proto_id), &buf[60]);
145 put_unaligned_be16(SCSI_VERSION_DESCRIPTOR_SPC4, &buf[62]);
146 if (cmd->se_dev->transport->get_device_type(dev) == TYPE_DISK)
147 put_unaligned_be16(SCSI_VERSION_DESCRIPTOR_SBC3, &buf[64]);
148
149 buf[4] = 91; /* Set additional length to 91 */
150
151 return 0;
152 }
153 EXPORT_SYMBOL(spc_emulate_inquiry_std);
154
155 /* unit serial number */
156 static sense_reason_t
spc_emulate_evpd_80(struct se_cmd * cmd,unsigned char * buf)157 spc_emulate_evpd_80(struct se_cmd *cmd, unsigned char *buf)
158 {
159 struct se_device *dev = cmd->se_dev;
160 u16 len;
161
162 if (dev->dev_flags & DF_EMULATED_VPD_UNIT_SERIAL) {
163 len = sprintf(&buf[4], "%s", dev->t10_wwn.unit_serial);
164 len++; /* Extra Byte for NULL Terminator */
165 buf[3] = len;
166 }
167 return 0;
168 }
169
170 /*
171 * Generate NAA IEEE Registered Extended designator
172 */
spc_gen_naa_6h_vendor_specific(struct se_device * dev,unsigned char * buf)173 void spc_gen_naa_6h_vendor_specific(struct se_device *dev,
174 unsigned char *buf)
175 {
176 unsigned char *p = &dev->t10_wwn.unit_serial[0];
177 u32 company_id = dev->t10_wwn.company_id;
178 int cnt, off = 0;
179 bool next = true;
180
181 /*
182 * Start NAA IEEE Registered Extended Identifier/Designator
183 */
184 buf[off] = 0x6 << 4;
185
186 /* IEEE COMPANY_ID */
187 buf[off++] |= (company_id >> 20) & 0xf;
188 buf[off++] = (company_id >> 12) & 0xff;
189 buf[off++] = (company_id >> 4) & 0xff;
190 buf[off] = (company_id & 0xf) << 4;
191
192 /*
193 * Generate up to 36 bits of VENDOR SPECIFIC IDENTIFIER starting on
194 * byte 3 bit 3-0 for NAA IEEE Registered Extended DESIGNATOR field
195 * format, followed by 64 bits of VENDOR SPECIFIC IDENTIFIER EXTENSION
196 * to complete the payload. These are based from VPD=0x80 PRODUCT SERIAL
197 * NUMBER set via vpd_unit_serial in target_core_configfs.c to ensure
198 * per device uniqeness.
199 */
200 for (cnt = off + 13; *p && off < cnt; p++) {
201 int val = hex_to_bin(*p);
202
203 if (val < 0)
204 continue;
205
206 if (next) {
207 next = false;
208 buf[off++] |= val;
209 } else {
210 next = true;
211 buf[off] = val << 4;
212 }
213 }
214 }
215
216 /*
217 * Device identification VPD, for a complete list of
218 * DESIGNATOR TYPEs see spc4r17 Table 459.
219 */
220 sense_reason_t
spc_emulate_evpd_83(struct se_cmd * cmd,unsigned char * buf)221 spc_emulate_evpd_83(struct se_cmd *cmd, unsigned char *buf)
222 {
223 struct se_device *dev = cmd->se_dev;
224 struct se_lun *lun = cmd->se_lun;
225 struct se_portal_group *tpg = NULL;
226 struct t10_alua_lu_gp_member *lu_gp_mem;
227 struct t10_alua_tg_pt_gp *tg_pt_gp;
228 unsigned char *prod = &dev->t10_wwn.model[0];
229 u32 prod_len;
230 u32 unit_serial_len, off = 0;
231 u16 len = 0, id_len;
232
233 off = 4;
234
235 /*
236 * NAA IEEE Registered Extended Assigned designator format, see
237 * spc4r17 section 7.7.3.6.5
238 *
239 * We depend upon a target_core_mod/ConfigFS provided
240 * /sys/kernel/config/target/core/$HBA/$DEV/wwn/vpd_unit_serial
241 * value in order to return the NAA id.
242 */
243 if (!(dev->dev_flags & DF_EMULATED_VPD_UNIT_SERIAL))
244 goto check_t10_vend_desc;
245
246 /* CODE SET == Binary */
247 buf[off++] = 0x1;
248
249 /* Set ASSOCIATION == addressed logical unit: 0)b */
250 buf[off] = 0x00;
251
252 /* Identifier/Designator type == NAA identifier */
253 buf[off++] |= 0x3;
254 off++;
255
256 /* Identifier/Designator length */
257 buf[off++] = 0x10;
258
259 /* NAA IEEE Registered Extended designator */
260 spc_gen_naa_6h_vendor_specific(dev, &buf[off]);
261
262 len = 20;
263 off = (len + 4);
264
265 check_t10_vend_desc:
266 /*
267 * T10 Vendor Identifier Page, see spc4r17 section 7.7.3.4
268 */
269 id_len = 8; /* For Vendor field */
270 prod_len = 4; /* For VPD Header */
271 prod_len += 8; /* For Vendor field */
272 prod_len += strlen(prod);
273 prod_len++; /* For : */
274
275 if (dev->dev_flags & DF_EMULATED_VPD_UNIT_SERIAL) {
276 unit_serial_len = strlen(&dev->t10_wwn.unit_serial[0]);
277 unit_serial_len++; /* For NULL Terminator */
278
279 id_len += sprintf(&buf[off+12], "%s:%s", prod,
280 &dev->t10_wwn.unit_serial[0]);
281 }
282 buf[off] = 0x2; /* ASCII */
283 buf[off+1] = 0x1; /* T10 Vendor ID */
284 buf[off+2] = 0x0;
285 /* left align Vendor ID and pad with spaces */
286 memset(&buf[off+4], 0x20, INQUIRY_VENDOR_LEN);
287 memcpy(&buf[off+4], dev->t10_wwn.vendor,
288 strnlen(dev->t10_wwn.vendor, INQUIRY_VENDOR_LEN));
289 /* Extra Byte for NULL Terminator */
290 id_len++;
291 /* Identifier Length */
292 buf[off+3] = id_len;
293 /* Header size for Designation descriptor */
294 len += (id_len + 4);
295 off += (id_len + 4);
296
297 if (1) {
298 struct t10_alua_lu_gp *lu_gp;
299 u32 padding, scsi_name_len, scsi_target_len;
300 u16 lu_gp_id = 0;
301 u16 tg_pt_gp_id = 0;
302 u16 tpgt;
303
304 tpg = lun->lun_tpg;
305 /*
306 * Relative target port identifer, see spc4r17
307 * section 7.7.3.7
308 *
309 * Get the PROTOCOL IDENTIFIER as defined by spc4r17
310 * section 7.5.1 Table 362
311 */
312 buf[off] = tpg->proto_id << 4;
313 buf[off++] |= 0x1; /* CODE SET == Binary */
314 buf[off] = 0x80; /* Set PIV=1 */
315 /* Set ASSOCIATION == target port: 01b */
316 buf[off] |= 0x10;
317 /* DESIGNATOR TYPE == Relative target port identifer */
318 buf[off++] |= 0x4;
319 off++; /* Skip over Reserved */
320 buf[off++] = 4; /* DESIGNATOR LENGTH */
321 /* Skip over Obsolete field in RTPI payload
322 * in Table 472 */
323 off += 2;
324 put_unaligned_be16(lun->lun_rtpi, &buf[off]);
325 off += 2;
326 len += 8; /* Header size + Designation descriptor */
327 /*
328 * Target port group identifier, see spc4r17
329 * section 7.7.3.8
330 *
331 * Get the PROTOCOL IDENTIFIER as defined by spc4r17
332 * section 7.5.1 Table 362
333 */
334 rcu_read_lock();
335 tg_pt_gp = rcu_dereference(lun->lun_tg_pt_gp);
336 if (!tg_pt_gp) {
337 rcu_read_unlock();
338 goto check_lu_gp;
339 }
340 tg_pt_gp_id = tg_pt_gp->tg_pt_gp_id;
341 rcu_read_unlock();
342
343 buf[off] = tpg->proto_id << 4;
344 buf[off++] |= 0x1; /* CODE SET == Binary */
345 buf[off] = 0x80; /* Set PIV=1 */
346 /* Set ASSOCIATION == target port: 01b */
347 buf[off] |= 0x10;
348 /* DESIGNATOR TYPE == Target port group identifier */
349 buf[off++] |= 0x5;
350 off++; /* Skip over Reserved */
351 buf[off++] = 4; /* DESIGNATOR LENGTH */
352 off += 2; /* Skip over Reserved Field */
353 put_unaligned_be16(tg_pt_gp_id, &buf[off]);
354 off += 2;
355 len += 8; /* Header size + Designation descriptor */
356 /*
357 * Logical Unit Group identifier, see spc4r17
358 * section 7.7.3.8
359 */
360 check_lu_gp:
361 lu_gp_mem = dev->dev_alua_lu_gp_mem;
362 if (!lu_gp_mem)
363 goto check_scsi_name;
364
365 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
366 lu_gp = lu_gp_mem->lu_gp;
367 if (!lu_gp) {
368 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
369 goto check_scsi_name;
370 }
371 lu_gp_id = lu_gp->lu_gp_id;
372 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
373
374 buf[off++] |= 0x1; /* CODE SET == Binary */
375 /* DESIGNATOR TYPE == Logical Unit Group identifier */
376 buf[off++] |= 0x6;
377 off++; /* Skip over Reserved */
378 buf[off++] = 4; /* DESIGNATOR LENGTH */
379 off += 2; /* Skip over Reserved Field */
380 put_unaligned_be16(lu_gp_id, &buf[off]);
381 off += 2;
382 len += 8; /* Header size + Designation descriptor */
383 /*
384 * SCSI name string designator, see spc4r17
385 * section 7.7.3.11
386 *
387 * Get the PROTOCOL IDENTIFIER as defined by spc4r17
388 * section 7.5.1 Table 362
389 */
390 check_scsi_name:
391 buf[off] = tpg->proto_id << 4;
392 buf[off++] |= 0x3; /* CODE SET == UTF-8 */
393 buf[off] = 0x80; /* Set PIV=1 */
394 /* Set ASSOCIATION == target port: 01b */
395 buf[off] |= 0x10;
396 /* DESIGNATOR TYPE == SCSI name string */
397 buf[off++] |= 0x8;
398 off += 2; /* Skip over Reserved and length */
399 /*
400 * SCSI name string identifer containing, $FABRIC_MOD
401 * dependent information. For LIO-Target and iSCSI
402 * Target Port, this means "<iSCSI name>,t,0x<TPGT> in
403 * UTF-8 encoding.
404 */
405 tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg);
406 scsi_name_len = sprintf(&buf[off], "%s,t,0x%04x",
407 tpg->se_tpg_tfo->tpg_get_wwn(tpg), tpgt);
408 scsi_name_len += 1 /* Include NULL terminator */;
409 /*
410 * The null-terminated, null-padded (see 4.4.2) SCSI
411 * NAME STRING field contains a UTF-8 format string.
412 * The number of bytes in the SCSI NAME STRING field
413 * (i.e., the value in the DESIGNATOR LENGTH field)
414 * shall be no larger than 256 and shall be a multiple
415 * of four.
416 */
417 padding = ((-scsi_name_len) & 3);
418 if (padding)
419 scsi_name_len += padding;
420 if (scsi_name_len > 256)
421 scsi_name_len = 256;
422
423 buf[off-1] = scsi_name_len;
424 off += scsi_name_len;
425 /* Header size + Designation descriptor */
426 len += (scsi_name_len + 4);
427
428 /*
429 * Target device designator
430 */
431 buf[off] = tpg->proto_id << 4;
432 buf[off++] |= 0x3; /* CODE SET == UTF-8 */
433 buf[off] = 0x80; /* Set PIV=1 */
434 /* Set ASSOCIATION == target device: 10b */
435 buf[off] |= 0x20;
436 /* DESIGNATOR TYPE == SCSI name string */
437 buf[off++] |= 0x8;
438 off += 2; /* Skip over Reserved and length */
439 /*
440 * SCSI name string identifer containing, $FABRIC_MOD
441 * dependent information. For LIO-Target and iSCSI
442 * Target Port, this means "<iSCSI name>" in
443 * UTF-8 encoding.
444 */
445 scsi_target_len = sprintf(&buf[off], "%s",
446 tpg->se_tpg_tfo->tpg_get_wwn(tpg));
447 scsi_target_len += 1 /* Include NULL terminator */;
448 /*
449 * The null-terminated, null-padded (see 4.4.2) SCSI
450 * NAME STRING field contains a UTF-8 format string.
451 * The number of bytes in the SCSI NAME STRING field
452 * (i.e., the value in the DESIGNATOR LENGTH field)
453 * shall be no larger than 256 and shall be a multiple
454 * of four.
455 */
456 padding = ((-scsi_target_len) & 3);
457 if (padding)
458 scsi_target_len += padding;
459 if (scsi_target_len > 256)
460 scsi_target_len = 256;
461
462 buf[off-1] = scsi_target_len;
463 off += scsi_target_len;
464
465 /* Header size + Designation descriptor */
466 len += (scsi_target_len + 4);
467 }
468 put_unaligned_be16(len, &buf[2]); /* Page Length for VPD 0x83 */
469 return 0;
470 }
471 EXPORT_SYMBOL(spc_emulate_evpd_83);
472
473 /* Extended INQUIRY Data VPD Page */
474 static sense_reason_t
spc_emulate_evpd_86(struct se_cmd * cmd,unsigned char * buf)475 spc_emulate_evpd_86(struct se_cmd *cmd, unsigned char *buf)
476 {
477 struct se_device *dev = cmd->se_dev;
478 struct se_session *sess = cmd->se_sess;
479
480 buf[3] = 0x3c;
481 /*
482 * Set GRD_CHK + REF_CHK for TYPE1 protection, or GRD_CHK
483 * only for TYPE3 protection.
484 */
485 if (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) {
486 if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE1_PROT ||
487 cmd->se_sess->sess_prot_type == TARGET_DIF_TYPE1_PROT)
488 buf[4] = 0x5;
489 else if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE3_PROT ||
490 cmd->se_sess->sess_prot_type == TARGET_DIF_TYPE3_PROT)
491 buf[4] = 0x4;
492 }
493
494 /* logical unit supports type 1 and type 3 protection */
495 if ((dev->transport->get_device_type(dev) == TYPE_DISK) &&
496 (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) &&
497 (dev->dev_attrib.pi_prot_type || cmd->se_sess->sess_prot_type)) {
498 buf[4] |= (0x3 << 3);
499 }
500
501 /* Set HEADSUP, ORDSUP, SIMPSUP */
502 buf[5] = 0x07;
503
504 /* If WriteCache emulation is enabled, set V_SUP */
505 if (target_check_wce(dev))
506 buf[6] = 0x01;
507 /* If an LBA map is present set R_SUP */
508 spin_lock(&cmd->se_dev->t10_alua.lba_map_lock);
509 if (!list_empty(&dev->t10_alua.lba_map_list))
510 buf[8] = 0x10;
511 spin_unlock(&cmd->se_dev->t10_alua.lba_map_lock);
512 return 0;
513 }
514
515 /* Block Limits VPD page */
516 static sense_reason_t
spc_emulate_evpd_b0(struct se_cmd * cmd,unsigned char * buf)517 spc_emulate_evpd_b0(struct se_cmd *cmd, unsigned char *buf)
518 {
519 struct se_device *dev = cmd->se_dev;
520 u32 mtl = 0;
521 int have_tp = 0, opt, min;
522
523 /*
524 * Following spc3r22 section 6.5.3 Block Limits VPD page, when
525 * emulate_tpu=1 or emulate_tpws=1 we will be expect a
526 * different page length for Thin Provisioning.
527 */
528 if (dev->dev_attrib.emulate_tpu || dev->dev_attrib.emulate_tpws)
529 have_tp = 1;
530
531 buf[0] = dev->transport->get_device_type(dev);
532 buf[3] = have_tp ? 0x3c : 0x10;
533
534 /* Set WSNZ to 1 */
535 buf[4] = 0x01;
536 /*
537 * Set MAXIMUM COMPARE AND WRITE LENGTH
538 */
539 if (dev->dev_attrib.emulate_caw)
540 buf[5] = 0x01;
541
542 /*
543 * Set OPTIMAL TRANSFER LENGTH GRANULARITY
544 */
545 if (dev->transport->get_io_min && (min = dev->transport->get_io_min(dev)))
546 put_unaligned_be16(min / dev->dev_attrib.block_size, &buf[6]);
547 else
548 put_unaligned_be16(1, &buf[6]);
549
550 /*
551 * Set MAXIMUM TRANSFER LENGTH
552 *
553 * XXX: Currently assumes single PAGE_SIZE per scatterlist for fabrics
554 * enforcing maximum HW scatter-gather-list entry limit
555 */
556 if (cmd->se_tfo->max_data_sg_nents) {
557 mtl = (cmd->se_tfo->max_data_sg_nents * PAGE_SIZE) /
558 dev->dev_attrib.block_size;
559 }
560 put_unaligned_be32(min_not_zero(mtl, dev->dev_attrib.hw_max_sectors), &buf[8]);
561
562 /*
563 * Set OPTIMAL TRANSFER LENGTH
564 */
565 if (dev->transport->get_io_opt && (opt = dev->transport->get_io_opt(dev)))
566 put_unaligned_be32(opt / dev->dev_attrib.block_size, &buf[12]);
567 else
568 put_unaligned_be32(dev->dev_attrib.optimal_sectors, &buf[12]);
569
570 /*
571 * Exit now if we don't support TP.
572 */
573 if (!have_tp)
574 goto max_write_same;
575
576 /*
577 * Set MAXIMUM UNMAP LBA COUNT
578 */
579 put_unaligned_be32(dev->dev_attrib.max_unmap_lba_count, &buf[20]);
580
581 /*
582 * Set MAXIMUM UNMAP BLOCK DESCRIPTOR COUNT
583 */
584 put_unaligned_be32(dev->dev_attrib.max_unmap_block_desc_count,
585 &buf[24]);
586
587 /*
588 * Set OPTIMAL UNMAP GRANULARITY
589 */
590 put_unaligned_be32(dev->dev_attrib.unmap_granularity, &buf[28]);
591
592 /*
593 * UNMAP GRANULARITY ALIGNMENT
594 */
595 put_unaligned_be32(dev->dev_attrib.unmap_granularity_alignment,
596 &buf[32]);
597 if (dev->dev_attrib.unmap_granularity_alignment != 0)
598 buf[32] |= 0x80; /* Set the UGAVALID bit */
599
600 /*
601 * MAXIMUM WRITE SAME LENGTH
602 */
603 max_write_same:
604 put_unaligned_be64(dev->dev_attrib.max_write_same_len, &buf[36]);
605
606 return 0;
607 }
608
609 /* Block Device Characteristics VPD page */
610 static sense_reason_t
spc_emulate_evpd_b1(struct se_cmd * cmd,unsigned char * buf)611 spc_emulate_evpd_b1(struct se_cmd *cmd, unsigned char *buf)
612 {
613 struct se_device *dev = cmd->se_dev;
614
615 buf[0] = dev->transport->get_device_type(dev);
616 buf[3] = 0x3c;
617 buf[5] = dev->dev_attrib.is_nonrot ? 1 : 0;
618
619 return 0;
620 }
621
622 /* Thin Provisioning VPD */
623 static sense_reason_t
spc_emulate_evpd_b2(struct se_cmd * cmd,unsigned char * buf)624 spc_emulate_evpd_b2(struct se_cmd *cmd, unsigned char *buf)
625 {
626 struct se_device *dev = cmd->se_dev;
627
628 /*
629 * From spc3r22 section 6.5.4 Thin Provisioning VPD page:
630 *
631 * The PAGE LENGTH field is defined in SPC-4. If the DP bit is set to
632 * zero, then the page length shall be set to 0004h. If the DP bit
633 * is set to one, then the page length shall be set to the value
634 * defined in table 162.
635 */
636 buf[0] = dev->transport->get_device_type(dev);
637
638 /*
639 * Set Hardcoded length mentioned above for DP=0
640 */
641 put_unaligned_be16(0x0004, &buf[2]);
642
643 /*
644 * The THRESHOLD EXPONENT field indicates the threshold set size in
645 * LBAs as a power of 2 (i.e., the threshold set size is equal to
646 * 2(threshold exponent)).
647 *
648 * Note that this is currently set to 0x00 as mkp says it will be
649 * changing again. We can enable this once it has settled in T10
650 * and is actually used by Linux/SCSI ML code.
651 */
652 buf[4] = 0x00;
653
654 /*
655 * A TPU bit set to one indicates that the device server supports
656 * the UNMAP command (see 5.25). A TPU bit set to zero indicates
657 * that the device server does not support the UNMAP command.
658 */
659 if (dev->dev_attrib.emulate_tpu != 0)
660 buf[5] = 0x80;
661
662 /*
663 * A TPWS bit set to one indicates that the device server supports
664 * the use of the WRITE SAME (16) command (see 5.42) to unmap LBAs.
665 * A TPWS bit set to zero indicates that the device server does not
666 * support the use of the WRITE SAME (16) command to unmap LBAs.
667 */
668 if (dev->dev_attrib.emulate_tpws != 0)
669 buf[5] |= 0x40 | 0x20;
670
671 /*
672 * The unmap_zeroes_data set means that the underlying device supports
673 * REQ_OP_DISCARD and has the discard_zeroes_data bit set. This
674 * satisfies the SBC requirements for LBPRZ, meaning that a subsequent
675 * read will return zeroes after an UNMAP or WRITE SAME (16) to an LBA
676 * See sbc4r36 6.6.4.
677 */
678 if (((dev->dev_attrib.emulate_tpu != 0) ||
679 (dev->dev_attrib.emulate_tpws != 0)) &&
680 (dev->dev_attrib.unmap_zeroes_data != 0))
681 buf[5] |= 0x04;
682
683 return 0;
684 }
685
686 /* Referrals VPD page */
687 static sense_reason_t
spc_emulate_evpd_b3(struct se_cmd * cmd,unsigned char * buf)688 spc_emulate_evpd_b3(struct se_cmd *cmd, unsigned char *buf)
689 {
690 struct se_device *dev = cmd->se_dev;
691
692 buf[0] = dev->transport->get_device_type(dev);
693 buf[3] = 0x0c;
694 put_unaligned_be32(dev->t10_alua.lba_map_segment_size, &buf[8]);
695 put_unaligned_be32(dev->t10_alua.lba_map_segment_multiplier, &buf[12]);
696
697 return 0;
698 }
699
700 static sense_reason_t
701 spc_emulate_evpd_00(struct se_cmd *cmd, unsigned char *buf);
702
703 static struct {
704 uint8_t page;
705 sense_reason_t (*emulate)(struct se_cmd *, unsigned char *);
706 } evpd_handlers[] = {
707 { .page = 0x00, .emulate = spc_emulate_evpd_00 },
708 { .page = 0x80, .emulate = spc_emulate_evpd_80 },
709 { .page = 0x83, .emulate = spc_emulate_evpd_83 },
710 { .page = 0x86, .emulate = spc_emulate_evpd_86 },
711 { .page = 0xb0, .emulate = spc_emulate_evpd_b0 },
712 { .page = 0xb1, .emulate = spc_emulate_evpd_b1 },
713 { .page = 0xb2, .emulate = spc_emulate_evpd_b2 },
714 { .page = 0xb3, .emulate = spc_emulate_evpd_b3 },
715 };
716
717 /* supported vital product data pages */
718 static sense_reason_t
spc_emulate_evpd_00(struct se_cmd * cmd,unsigned char * buf)719 spc_emulate_evpd_00(struct se_cmd *cmd, unsigned char *buf)
720 {
721 int p;
722
723 /*
724 * Only report the INQUIRY EVPD=1 pages after a valid NAA
725 * Registered Extended LUN WWN has been set via ConfigFS
726 * during device creation/restart.
727 */
728 if (cmd->se_dev->dev_flags & DF_EMULATED_VPD_UNIT_SERIAL) {
729 buf[3] = ARRAY_SIZE(evpd_handlers);
730 for (p = 0; p < ARRAY_SIZE(evpd_handlers); ++p)
731 buf[p + 4] = evpd_handlers[p].page;
732 }
733
734 return 0;
735 }
736
737 static sense_reason_t
spc_emulate_inquiry(struct se_cmd * cmd)738 spc_emulate_inquiry(struct se_cmd *cmd)
739 {
740 struct se_device *dev = cmd->se_dev;
741 unsigned char *rbuf;
742 unsigned char *cdb = cmd->t_task_cdb;
743 unsigned char *buf;
744 sense_reason_t ret;
745 int p;
746 int len = 0;
747
748 buf = kzalloc(SE_INQUIRY_BUF, GFP_KERNEL);
749 if (!buf) {
750 pr_err("Unable to allocate response buffer for INQUIRY\n");
751 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
752 }
753
754 buf[0] = dev->transport->get_device_type(dev);
755
756 if (!(cdb[1] & 0x1)) {
757 if (cdb[2]) {
758 pr_err("INQUIRY with EVPD==0 but PAGE CODE=%02x\n",
759 cdb[2]);
760 ret = TCM_INVALID_CDB_FIELD;
761 goto out;
762 }
763
764 ret = spc_emulate_inquiry_std(cmd, buf);
765 len = buf[4] + 5;
766 goto out;
767 }
768
769 for (p = 0; p < ARRAY_SIZE(evpd_handlers); ++p) {
770 if (cdb[2] == evpd_handlers[p].page) {
771 buf[1] = cdb[2];
772 ret = evpd_handlers[p].emulate(cmd, buf);
773 len = get_unaligned_be16(&buf[2]) + 4;
774 goto out;
775 }
776 }
777
778 pr_debug("Unknown VPD Code: 0x%02x\n", cdb[2]);
779 ret = TCM_INVALID_CDB_FIELD;
780
781 out:
782 rbuf = transport_kmap_data_sg(cmd);
783 if (rbuf) {
784 memcpy(rbuf, buf, min_t(u32, SE_INQUIRY_BUF, cmd->data_length));
785 transport_kunmap_data_sg(cmd);
786 }
787 kfree(buf);
788
789 if (!ret)
790 target_complete_cmd_with_length(cmd, SAM_STAT_GOOD, len);
791 return ret;
792 }
793
spc_modesense_rwrecovery(struct se_cmd * cmd,u8 pc,u8 * p)794 static int spc_modesense_rwrecovery(struct se_cmd *cmd, u8 pc, u8 *p)
795 {
796 p[0] = 0x01;
797 p[1] = 0x0a;
798
799 /* No changeable values for now */
800 if (pc == 1)
801 goto out;
802
803 out:
804 return 12;
805 }
806
spc_modesense_control(struct se_cmd * cmd,u8 pc,u8 * p)807 static int spc_modesense_control(struct se_cmd *cmd, u8 pc, u8 *p)
808 {
809 struct se_device *dev = cmd->se_dev;
810 struct se_session *sess = cmd->se_sess;
811
812 p[0] = 0x0a;
813 p[1] = 0x0a;
814
815 /* No changeable values for now */
816 if (pc == 1)
817 goto out;
818
819 /* GLTSD: No implicit save of log parameters */
820 p[2] = (1 << 1);
821 if (target_sense_desc_format(dev))
822 /* D_SENSE: Descriptor format sense data for 64bit sectors */
823 p[2] |= (1 << 2);
824
825 /*
826 * From spc4r23, 7.4.7 Control mode page
827 *
828 * The QUEUE ALGORITHM MODIFIER field (see table 368) specifies
829 * restrictions on the algorithm used for reordering commands
830 * having the SIMPLE task attribute (see SAM-4).
831 *
832 * Table 368 -- QUEUE ALGORITHM MODIFIER field
833 * Code Description
834 * 0h Restricted reordering
835 * 1h Unrestricted reordering allowed
836 * 2h to 7h Reserved
837 * 8h to Fh Vendor specific
838 *
839 * A value of zero in the QUEUE ALGORITHM MODIFIER field specifies that
840 * the device server shall order the processing sequence of commands
841 * having the SIMPLE task attribute such that data integrity is maintained
842 * for that I_T nexus (i.e., if the transmission of new SCSI transport protocol
843 * requests is halted at any time, the final value of all data observable
844 * on the medium shall be the same as if all the commands had been processed
845 * with the ORDERED task attribute).
846 *
847 * A value of one in the QUEUE ALGORITHM MODIFIER field specifies that the
848 * device server may reorder the processing sequence of commands having the
849 * SIMPLE task attribute in any manner. Any data integrity exposures related to
850 * command sequence order shall be explicitly handled by the application client
851 * through the selection of appropriate ommands and task attributes.
852 */
853 p[3] = (dev->dev_attrib.emulate_rest_reord == 1) ? 0x00 : 0x10;
854 /*
855 * From spc4r17, section 7.4.6 Control mode Page
856 *
857 * Unit Attention interlocks control (UN_INTLCK_CTRL) to code 00b
858 *
859 * 00b: The logical unit shall 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 a com-
862 * mand is completed with BUSY, TASK SET FULL, or RESERVATION CONFLICT
863 * status.
864 *
865 * 10b: 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 not establish a unit attention condition when
868 * a command is completed with BUSY, TASK SET FULL, or RESERVATION
869 * CONFLICT status.
870 *
871 * 11b a The logical unit shall not clear any unit attention condition
872 * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION
873 * status and shall establish a unit attention condition for the
874 * initiator port associated with the I_T nexus on which the BUSY,
875 * TASK SET FULL, or RESERVATION CONFLICT status is being returned.
876 * Depending on the status, the additional sense code shall be set to
877 * PREVIOUS BUSY STATUS, PREVIOUS TASK SET FULL STATUS, or PREVIOUS
878 * RESERVATION CONFLICT STATUS. Until it is cleared by a REQUEST SENSE
879 * command, a unit attention condition shall be established only once
880 * for a BUSY, TASK SET FULL, or RESERVATION CONFLICT status regardless
881 * to the number of commands completed with one of those status codes.
882 */
883 switch (dev->dev_attrib.emulate_ua_intlck_ctrl) {
884 case TARGET_UA_INTLCK_CTRL_ESTABLISH_UA:
885 p[4] = 0x30;
886 break;
887 case TARGET_UA_INTLCK_CTRL_NO_CLEAR:
888 p[4] = 0x20;
889 break;
890 default: /* TARGET_UA_INTLCK_CTRL_CLEAR */
891 p[4] = 0x00;
892 break;
893 }
894 /*
895 * From spc4r17, section 7.4.6 Control mode Page
896 *
897 * Task Aborted Status (TAS) bit set to zero.
898 *
899 * A task aborted status (TAS) bit set to zero specifies that aborted
900 * tasks shall be terminated by the device server without any response
901 * to the application client. A TAS bit set to one specifies that tasks
902 * aborted by the actions of an I_T nexus other than the I_T nexus on
903 * which the command was received shall be completed with TASK ABORTED
904 * status (see SAM-4).
905 */
906 p[5] = (dev->dev_attrib.emulate_tas) ? 0x40 : 0x00;
907 /*
908 * From spc4r30, section 7.5.7 Control mode page
909 *
910 * Application Tag Owner (ATO) bit set to one.
911 *
912 * If the ATO bit is set to one the device server shall not modify the
913 * LOGICAL BLOCK APPLICATION TAG field and, depending on the protection
914 * type, shall not modify the contents of the LOGICAL BLOCK REFERENCE
915 * TAG field.
916 */
917 if (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) {
918 if (dev->dev_attrib.pi_prot_type || sess->sess_prot_type)
919 p[5] |= 0x80;
920 }
921
922 p[8] = 0xff;
923 p[9] = 0xff;
924 p[11] = 30;
925
926 out:
927 return 12;
928 }
929
spc_modesense_caching(struct se_cmd * cmd,u8 pc,u8 * p)930 static int spc_modesense_caching(struct se_cmd *cmd, u8 pc, u8 *p)
931 {
932 struct se_device *dev = cmd->se_dev;
933
934 p[0] = 0x08;
935 p[1] = 0x12;
936
937 /* No changeable values for now */
938 if (pc == 1)
939 goto out;
940
941 if (target_check_wce(dev))
942 p[2] = 0x04; /* Write Cache Enable */
943 p[12] = 0x20; /* Disabled Read Ahead */
944
945 out:
946 return 20;
947 }
948
spc_modesense_informational_exceptions(struct se_cmd * cmd,u8 pc,unsigned char * p)949 static int spc_modesense_informational_exceptions(struct se_cmd *cmd, u8 pc, unsigned char *p)
950 {
951 p[0] = 0x1c;
952 p[1] = 0x0a;
953
954 /* No changeable values for now */
955 if (pc == 1)
956 goto out;
957
958 out:
959 return 12;
960 }
961
962 static struct {
963 uint8_t page;
964 uint8_t subpage;
965 int (*emulate)(struct se_cmd *, u8, unsigned char *);
966 } modesense_handlers[] = {
967 { .page = 0x01, .subpage = 0x00, .emulate = spc_modesense_rwrecovery },
968 { .page = 0x08, .subpage = 0x00, .emulate = spc_modesense_caching },
969 { .page = 0x0a, .subpage = 0x00, .emulate = spc_modesense_control },
970 { .page = 0x1c, .subpage = 0x00, .emulate = spc_modesense_informational_exceptions },
971 };
972
spc_modesense_write_protect(unsigned char * buf,int type)973 static void spc_modesense_write_protect(unsigned char *buf, int type)
974 {
975 /*
976 * I believe that the WP bit (bit 7) in the mode header is the same for
977 * all device types..
978 */
979 switch (type) {
980 case TYPE_DISK:
981 case TYPE_TAPE:
982 default:
983 buf[0] |= 0x80; /* WP bit */
984 break;
985 }
986 }
987
spc_modesense_dpofua(unsigned char * buf,int type)988 static void spc_modesense_dpofua(unsigned char *buf, int type)
989 {
990 switch (type) {
991 case TYPE_DISK:
992 buf[0] |= 0x10; /* DPOFUA bit */
993 break;
994 default:
995 break;
996 }
997 }
998
spc_modesense_blockdesc(unsigned char * buf,u64 blocks,u32 block_size)999 static int spc_modesense_blockdesc(unsigned char *buf, u64 blocks, u32 block_size)
1000 {
1001 *buf++ = 8;
1002 put_unaligned_be32(min(blocks, 0xffffffffull), buf);
1003 buf += 4;
1004 put_unaligned_be32(block_size, buf);
1005 return 9;
1006 }
1007
spc_modesense_long_blockdesc(unsigned char * buf,u64 blocks,u32 block_size)1008 static int spc_modesense_long_blockdesc(unsigned char *buf, u64 blocks, u32 block_size)
1009 {
1010 if (blocks <= 0xffffffff)
1011 return spc_modesense_blockdesc(buf + 3, blocks, block_size) + 3;
1012
1013 *buf++ = 1; /* LONGLBA */
1014 buf += 2;
1015 *buf++ = 16;
1016 put_unaligned_be64(blocks, buf);
1017 buf += 12;
1018 put_unaligned_be32(block_size, buf);
1019
1020 return 17;
1021 }
1022
spc_emulate_modesense(struct se_cmd * cmd)1023 static sense_reason_t spc_emulate_modesense(struct se_cmd *cmd)
1024 {
1025 struct se_device *dev = cmd->se_dev;
1026 char *cdb = cmd->t_task_cdb;
1027 unsigned char buf[SE_MODE_PAGE_BUF], *rbuf;
1028 int type = dev->transport->get_device_type(dev);
1029 int ten = (cmd->t_task_cdb[0] == MODE_SENSE_10);
1030 bool dbd = !!(cdb[1] & 0x08);
1031 bool llba = ten ? !!(cdb[1] & 0x10) : false;
1032 u8 pc = cdb[2] >> 6;
1033 u8 page = cdb[2] & 0x3f;
1034 u8 subpage = cdb[3];
1035 int length = 0;
1036 int ret;
1037 int i;
1038
1039 memset(buf, 0, SE_MODE_PAGE_BUF);
1040
1041 /*
1042 * Skip over MODE DATA LENGTH + MEDIUM TYPE fields to byte 3 for
1043 * MODE_SENSE_10 and byte 2 for MODE_SENSE (6).
1044 */
1045 length = ten ? 3 : 2;
1046
1047 /* DEVICE-SPECIFIC PARAMETER */
1048 if (cmd->se_lun->lun_access_ro || target_lun_is_rdonly(cmd))
1049 spc_modesense_write_protect(&buf[length], type);
1050
1051 /*
1052 * SBC only allows us to enable FUA and DPO together. Fortunately
1053 * DPO is explicitly specified as a hint, so a noop is a perfectly
1054 * valid implementation.
1055 */
1056 if (target_check_fua(dev))
1057 spc_modesense_dpofua(&buf[length], type);
1058
1059 ++length;
1060
1061 /* BLOCK DESCRIPTOR */
1062
1063 /*
1064 * For now we only include a block descriptor for disk (SBC)
1065 * devices; other command sets use a slightly different format.
1066 */
1067 if (!dbd && type == TYPE_DISK) {
1068 u64 blocks = dev->transport->get_blocks(dev);
1069 u32 block_size = dev->dev_attrib.block_size;
1070
1071 if (ten) {
1072 if (llba) {
1073 length += spc_modesense_long_blockdesc(&buf[length],
1074 blocks, block_size);
1075 } else {
1076 length += 3;
1077 length += spc_modesense_blockdesc(&buf[length],
1078 blocks, block_size);
1079 }
1080 } else {
1081 length += spc_modesense_blockdesc(&buf[length], blocks,
1082 block_size);
1083 }
1084 } else {
1085 if (ten)
1086 length += 4;
1087 else
1088 length += 1;
1089 }
1090
1091 if (page == 0x3f) {
1092 if (subpage != 0x00 && subpage != 0xff) {
1093 pr_warn("MODE_SENSE: Invalid subpage code: 0x%02x\n", subpage);
1094 return TCM_INVALID_CDB_FIELD;
1095 }
1096
1097 for (i = 0; i < ARRAY_SIZE(modesense_handlers); ++i) {
1098 /*
1099 * Tricky way to say all subpage 00h for
1100 * subpage==0, all subpages for subpage==0xff
1101 * (and we just checked above that those are
1102 * the only two possibilities).
1103 */
1104 if ((modesense_handlers[i].subpage & ~subpage) == 0) {
1105 ret = modesense_handlers[i].emulate(cmd, pc, &buf[length]);
1106 if (!ten && length + ret >= 255)
1107 break;
1108 length += ret;
1109 }
1110 }
1111
1112 goto set_length;
1113 }
1114
1115 for (i = 0; i < ARRAY_SIZE(modesense_handlers); ++i)
1116 if (modesense_handlers[i].page == page &&
1117 modesense_handlers[i].subpage == subpage) {
1118 length += modesense_handlers[i].emulate(cmd, pc, &buf[length]);
1119 goto set_length;
1120 }
1121
1122 /*
1123 * We don't intend to implement:
1124 * - obsolete page 03h "format parameters" (checked by Solaris)
1125 */
1126 if (page != 0x03)
1127 pr_err("MODE SENSE: unimplemented page/subpage: 0x%02x/0x%02x\n",
1128 page, subpage);
1129
1130 return TCM_UNKNOWN_MODE_PAGE;
1131
1132 set_length:
1133 if (ten)
1134 put_unaligned_be16(length - 2, buf);
1135 else
1136 buf[0] = length - 1;
1137
1138 rbuf = transport_kmap_data_sg(cmd);
1139 if (rbuf) {
1140 memcpy(rbuf, buf, min_t(u32, SE_MODE_PAGE_BUF, cmd->data_length));
1141 transport_kunmap_data_sg(cmd);
1142 }
1143
1144 target_complete_cmd_with_length(cmd, SAM_STAT_GOOD, length);
1145 return 0;
1146 }
1147
spc_emulate_modeselect(struct se_cmd * cmd)1148 static sense_reason_t spc_emulate_modeselect(struct se_cmd *cmd)
1149 {
1150 char *cdb = cmd->t_task_cdb;
1151 bool ten = cdb[0] == MODE_SELECT_10;
1152 int off = ten ? 8 : 4;
1153 bool pf = !!(cdb[1] & 0x10);
1154 u8 page, subpage;
1155 unsigned char *buf;
1156 unsigned char tbuf[SE_MODE_PAGE_BUF];
1157 int length;
1158 sense_reason_t ret = 0;
1159 int i;
1160
1161 if (!cmd->data_length) {
1162 target_complete_cmd(cmd, SAM_STAT_GOOD);
1163 return 0;
1164 }
1165
1166 if (cmd->data_length < off + 2)
1167 return TCM_PARAMETER_LIST_LENGTH_ERROR;
1168
1169 buf = transport_kmap_data_sg(cmd);
1170 if (!buf)
1171 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1172
1173 if (!pf) {
1174 ret = TCM_INVALID_CDB_FIELD;
1175 goto out;
1176 }
1177
1178 page = buf[off] & 0x3f;
1179 subpage = buf[off] & 0x40 ? buf[off + 1] : 0;
1180
1181 for (i = 0; i < ARRAY_SIZE(modesense_handlers); ++i)
1182 if (modesense_handlers[i].page == page &&
1183 modesense_handlers[i].subpage == subpage) {
1184 memset(tbuf, 0, SE_MODE_PAGE_BUF);
1185 length = modesense_handlers[i].emulate(cmd, 0, tbuf);
1186 goto check_contents;
1187 }
1188
1189 ret = TCM_UNKNOWN_MODE_PAGE;
1190 goto out;
1191
1192 check_contents:
1193 if (cmd->data_length < off + length) {
1194 ret = TCM_PARAMETER_LIST_LENGTH_ERROR;
1195 goto out;
1196 }
1197
1198 if (memcmp(buf + off, tbuf, length))
1199 ret = TCM_INVALID_PARAMETER_LIST;
1200
1201 out:
1202 transport_kunmap_data_sg(cmd);
1203
1204 if (!ret)
1205 target_complete_cmd(cmd, SAM_STAT_GOOD);
1206 return ret;
1207 }
1208
spc_emulate_request_sense(struct se_cmd * cmd)1209 static sense_reason_t spc_emulate_request_sense(struct se_cmd *cmd)
1210 {
1211 unsigned char *cdb = cmd->t_task_cdb;
1212 unsigned char *rbuf;
1213 u8 ua_asc = 0, ua_ascq = 0;
1214 unsigned char buf[SE_SENSE_BUF];
1215 bool desc_format = target_sense_desc_format(cmd->se_dev);
1216
1217 memset(buf, 0, SE_SENSE_BUF);
1218
1219 if (cdb[1] & 0x01) {
1220 pr_err("REQUEST_SENSE description emulation not"
1221 " supported\n");
1222 return TCM_INVALID_CDB_FIELD;
1223 }
1224
1225 rbuf = transport_kmap_data_sg(cmd);
1226 if (!rbuf)
1227 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1228
1229 if (!core_scsi3_ua_clear_for_request_sense(cmd, &ua_asc, &ua_ascq))
1230 scsi_build_sense_buffer(desc_format, buf, UNIT_ATTENTION,
1231 ua_asc, ua_ascq);
1232 else
1233 scsi_build_sense_buffer(desc_format, buf, NO_SENSE, 0x0, 0x0);
1234
1235 memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length));
1236 transport_kunmap_data_sg(cmd);
1237
1238 target_complete_cmd(cmd, SAM_STAT_GOOD);
1239 return 0;
1240 }
1241
spc_emulate_report_luns(struct se_cmd * cmd)1242 sense_reason_t spc_emulate_report_luns(struct se_cmd *cmd)
1243 {
1244 struct se_dev_entry *deve;
1245 struct se_session *sess = cmd->se_sess;
1246 struct se_node_acl *nacl;
1247 struct scsi_lun slun;
1248 unsigned char *buf;
1249 u32 lun_count = 0, offset = 8;
1250 __be32 len;
1251
1252 buf = transport_kmap_data_sg(cmd);
1253 if (cmd->data_length && !buf)
1254 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1255
1256 /*
1257 * If no struct se_session pointer is present, this struct se_cmd is
1258 * coming via a target_core_mod PASSTHROUGH op, and not through
1259 * a $FABRIC_MOD. In that case, report LUN=0 only.
1260 */
1261 if (!sess)
1262 goto done;
1263
1264 nacl = sess->se_node_acl;
1265
1266 rcu_read_lock();
1267 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
1268 /*
1269 * We determine the correct LUN LIST LENGTH even once we
1270 * have reached the initial allocation length.
1271 * See SPC2-R20 7.19.
1272 */
1273 lun_count++;
1274 if (offset >= cmd->data_length)
1275 continue;
1276
1277 int_to_scsilun(deve->mapped_lun, &slun);
1278 memcpy(buf + offset, &slun,
1279 min(8u, cmd->data_length - offset));
1280 offset += 8;
1281 }
1282 rcu_read_unlock();
1283
1284 /*
1285 * See SPC3 r07, page 159.
1286 */
1287 done:
1288 /*
1289 * If no LUNs are accessible, report virtual LUN 0.
1290 */
1291 if (lun_count == 0) {
1292 int_to_scsilun(0, &slun);
1293 if (cmd->data_length > 8)
1294 memcpy(buf + offset, &slun,
1295 min(8u, cmd->data_length - offset));
1296 lun_count = 1;
1297 }
1298
1299 if (buf) {
1300 len = cpu_to_be32(lun_count * 8);
1301 memcpy(buf, &len, min_t(int, sizeof len, cmd->data_length));
1302 transport_kunmap_data_sg(cmd);
1303 }
1304
1305 target_complete_cmd_with_length(cmd, SAM_STAT_GOOD, 8 + lun_count * 8);
1306 return 0;
1307 }
1308 EXPORT_SYMBOL(spc_emulate_report_luns);
1309
1310 static sense_reason_t
spc_emulate_testunitready(struct se_cmd * cmd)1311 spc_emulate_testunitready(struct se_cmd *cmd)
1312 {
1313 target_complete_cmd(cmd, SAM_STAT_GOOD);
1314 return 0;
1315 }
1316
1317 sense_reason_t
spc_parse_cdb(struct se_cmd * cmd,unsigned int * size)1318 spc_parse_cdb(struct se_cmd *cmd, unsigned int *size)
1319 {
1320 struct se_device *dev = cmd->se_dev;
1321 unsigned char *cdb = cmd->t_task_cdb;
1322
1323 if (!dev->dev_attrib.emulate_pr &&
1324 ((cdb[0] == PERSISTENT_RESERVE_IN) ||
1325 (cdb[0] == PERSISTENT_RESERVE_OUT) ||
1326 (cdb[0] == RELEASE || cdb[0] == RELEASE_10) ||
1327 (cdb[0] == RESERVE || cdb[0] == RESERVE_10))) {
1328 return TCM_UNSUPPORTED_SCSI_OPCODE;
1329 }
1330
1331 switch (cdb[0]) {
1332 case MODE_SELECT:
1333 *size = cdb[4];
1334 cmd->execute_cmd = spc_emulate_modeselect;
1335 break;
1336 case MODE_SELECT_10:
1337 *size = get_unaligned_be16(&cdb[7]);
1338 cmd->execute_cmd = spc_emulate_modeselect;
1339 break;
1340 case MODE_SENSE:
1341 *size = cdb[4];
1342 cmd->execute_cmd = spc_emulate_modesense;
1343 break;
1344 case MODE_SENSE_10:
1345 *size = get_unaligned_be16(&cdb[7]);
1346 cmd->execute_cmd = spc_emulate_modesense;
1347 break;
1348 case LOG_SELECT:
1349 case LOG_SENSE:
1350 *size = get_unaligned_be16(&cdb[7]);
1351 break;
1352 case PERSISTENT_RESERVE_IN:
1353 *size = get_unaligned_be16(&cdb[7]);
1354 cmd->execute_cmd = target_scsi3_emulate_pr_in;
1355 break;
1356 case PERSISTENT_RESERVE_OUT:
1357 *size = get_unaligned_be32(&cdb[5]);
1358 cmd->execute_cmd = target_scsi3_emulate_pr_out;
1359 break;
1360 case RELEASE:
1361 case RELEASE_10:
1362 if (cdb[0] == RELEASE_10)
1363 *size = get_unaligned_be16(&cdb[7]);
1364 else
1365 *size = cmd->data_length;
1366
1367 cmd->execute_cmd = target_scsi2_reservation_release;
1368 break;
1369 case RESERVE:
1370 case RESERVE_10:
1371 /*
1372 * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
1373 * Assume the passthrough or $FABRIC_MOD will tell us about it.
1374 */
1375 if (cdb[0] == RESERVE_10)
1376 *size = get_unaligned_be16(&cdb[7]);
1377 else
1378 *size = cmd->data_length;
1379
1380 cmd->execute_cmd = target_scsi2_reservation_reserve;
1381 break;
1382 case REQUEST_SENSE:
1383 *size = cdb[4];
1384 cmd->execute_cmd = spc_emulate_request_sense;
1385 break;
1386 case INQUIRY:
1387 *size = get_unaligned_be16(&cdb[3]);
1388
1389 /*
1390 * Do implicit HEAD_OF_QUEUE processing for INQUIRY.
1391 * See spc4r17 section 5.3
1392 */
1393 cmd->sam_task_attr = TCM_HEAD_TAG;
1394 cmd->execute_cmd = spc_emulate_inquiry;
1395 break;
1396 case SECURITY_PROTOCOL_IN:
1397 case SECURITY_PROTOCOL_OUT:
1398 *size = get_unaligned_be32(&cdb[6]);
1399 break;
1400 case EXTENDED_COPY:
1401 *size = get_unaligned_be32(&cdb[10]);
1402 cmd->execute_cmd = target_do_xcopy;
1403 break;
1404 case RECEIVE_COPY_RESULTS:
1405 *size = get_unaligned_be32(&cdb[10]);
1406 cmd->execute_cmd = target_do_receive_copy_results;
1407 break;
1408 case READ_ATTRIBUTE:
1409 case WRITE_ATTRIBUTE:
1410 *size = get_unaligned_be32(&cdb[10]);
1411 break;
1412 case RECEIVE_DIAGNOSTIC:
1413 case SEND_DIAGNOSTIC:
1414 *size = get_unaligned_be16(&cdb[3]);
1415 break;
1416 case WRITE_BUFFER:
1417 *size = get_unaligned_be24(&cdb[6]);
1418 break;
1419 case REPORT_LUNS:
1420 cmd->execute_cmd = spc_emulate_report_luns;
1421 *size = get_unaligned_be32(&cdb[6]);
1422 /*
1423 * Do implicit HEAD_OF_QUEUE processing for REPORT_LUNS
1424 * See spc4r17 section 5.3
1425 */
1426 cmd->sam_task_attr = TCM_HEAD_TAG;
1427 break;
1428 case TEST_UNIT_READY:
1429 cmd->execute_cmd = spc_emulate_testunitready;
1430 *size = 0;
1431 break;
1432 case MAINTENANCE_IN:
1433 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
1434 /*
1435 * MAINTENANCE_IN from SCC-2
1436 * Check for emulated MI_REPORT_TARGET_PGS
1437 */
1438 if ((cdb[1] & 0x1f) == MI_REPORT_TARGET_PGS) {
1439 cmd->execute_cmd =
1440 target_emulate_report_target_port_groups;
1441 }
1442 *size = get_unaligned_be32(&cdb[6]);
1443 } else {
1444 /*
1445 * GPCMD_SEND_KEY from multi media commands
1446 */
1447 *size = get_unaligned_be16(&cdb[8]);
1448 }
1449 break;
1450 case MAINTENANCE_OUT:
1451 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
1452 /*
1453 * MAINTENANCE_OUT from SCC-2
1454 * Check for emulated MO_SET_TARGET_PGS.
1455 */
1456 if (cdb[1] == MO_SET_TARGET_PGS) {
1457 cmd->execute_cmd =
1458 target_emulate_set_target_port_groups;
1459 }
1460 *size = get_unaligned_be32(&cdb[6]);
1461 } else {
1462 /*
1463 * GPCMD_SEND_KEY from multi media commands
1464 */
1465 *size = get_unaligned_be16(&cdb[8]);
1466 }
1467 break;
1468 default:
1469 return TCM_UNSUPPORTED_SCSI_OPCODE;
1470 }
1471
1472 return 0;
1473 }
1474 EXPORT_SYMBOL(spc_parse_cdb);
1475