1 /*
2 * SCSI Primary Commands (SPC) parsing and emulation.
3 *
4 * (c) Copyright 2002-2013 Datera, Inc.
5 *
6 * Nicholas A. Bellinger <nab@kernel.org>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
21 */
22
23 #include <linux/kernel.h>
24 #include <linux/module.h>
25 #include <asm/unaligned.h>
26
27 #include <scsi/scsi.h>
28 #include <scsi/scsi_tcq.h>
29
30 #include <target/target_core_base.h>
31 #include <target/target_core_backend.h>
32 #include <target/target_core_fabric.h>
33
34 #include "target_core_internal.h"
35 #include "target_core_alua.h"
36 #include "target_core_pr.h"
37 #include "target_core_ua.h"
38 #include "target_core_xcopy.h"
39
spc_fill_alua_data(struct se_port * port,unsigned char * buf)40 static void spc_fill_alua_data(struct se_port *port, unsigned char *buf)
41 {
42 struct t10_alua_tg_pt_gp *tg_pt_gp;
43 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
44
45 /*
46 * Set SCCS for MAINTENANCE_IN + REPORT_TARGET_PORT_GROUPS.
47 */
48 buf[5] = 0x80;
49
50 /*
51 * Set TPGS field for explicit and/or implicit ALUA access type
52 * and opteration.
53 *
54 * See spc4r17 section 6.4.2 Table 135
55 */
56 if (!port)
57 return;
58 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
59 if (!tg_pt_gp_mem)
60 return;
61
62 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
63 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
64 if (tg_pt_gp)
65 buf[5] |= tg_pt_gp->tg_pt_gp_alua_access_type;
66 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
67 }
68
69 sense_reason_t
spc_emulate_inquiry_std(struct se_cmd * cmd,unsigned char * buf)70 spc_emulate_inquiry_std(struct se_cmd *cmd, unsigned char *buf)
71 {
72 struct se_lun *lun = cmd->se_lun;
73 struct se_device *dev = cmd->se_dev;
74 struct se_session *sess = cmd->se_sess;
75
76 /* Set RMB (removable media) for tape devices */
77 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
78 buf[1] = 0x80;
79
80 buf[2] = 0x05; /* SPC-3 */
81
82 /*
83 * NORMACA and HISUP = 0, RESPONSE DATA FORMAT = 2
84 *
85 * SPC4 says:
86 * A RESPONSE DATA FORMAT field set to 2h indicates that the
87 * standard INQUIRY data is in the format defined in this
88 * standard. Response data format values less than 2h are
89 * obsolete. Response data format values greater than 2h are
90 * reserved.
91 */
92 buf[3] = 2;
93
94 /*
95 * Enable SCCS and TPGS fields for Emulated ALUA
96 */
97 spc_fill_alua_data(lun->lun_sep, buf);
98
99 /*
100 * Set Third-Party Copy (3PC) bit to indicate support for EXTENDED_COPY
101 */
102 if (dev->dev_attrib.emulate_3pc)
103 buf[5] |= 0x8;
104 /*
105 * Set Protection (PROTECT) bit when DIF has been enabled on the
106 * device, and the transport supports VERIFY + PASS.
107 */
108 if (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) {
109 if (dev->dev_attrib.pi_prot_type)
110 buf[5] |= 0x1;
111 }
112
113 buf[7] = 0x2; /* CmdQue=1 */
114
115 memcpy(&buf[8], "LIO-ORG ", 8);
116 memset(&buf[16], 0x20, 16);
117 memcpy(&buf[16], dev->t10_wwn.model,
118 min_t(size_t, strlen(dev->t10_wwn.model), 16));
119 memcpy(&buf[32], dev->t10_wwn.revision,
120 min_t(size_t, strlen(dev->t10_wwn.revision), 4));
121 buf[4] = 31; /* Set additional length to 31 */
122
123 return 0;
124 }
125 EXPORT_SYMBOL(spc_emulate_inquiry_std);
126
127 /* unit serial number */
128 static sense_reason_t
spc_emulate_evpd_80(struct se_cmd * cmd,unsigned char * buf)129 spc_emulate_evpd_80(struct se_cmd *cmd, unsigned char *buf)
130 {
131 struct se_device *dev = cmd->se_dev;
132 u16 len;
133
134 if (dev->dev_flags & DF_EMULATED_VPD_UNIT_SERIAL) {
135 len = sprintf(&buf[4], "%s", dev->t10_wwn.unit_serial);
136 len++; /* Extra Byte for NULL Terminator */
137 buf[3] = len;
138 }
139 return 0;
140 }
141
spc_parse_naa_6h_vendor_specific(struct se_device * dev,unsigned char * buf)142 void spc_parse_naa_6h_vendor_specific(struct se_device *dev,
143 unsigned char *buf)
144 {
145 unsigned char *p = &dev->t10_wwn.unit_serial[0];
146 int cnt;
147 bool next = true;
148
149 /*
150 * Generate up to 36 bits of VENDOR SPECIFIC IDENTIFIER starting on
151 * byte 3 bit 3-0 for NAA IEEE Registered Extended DESIGNATOR field
152 * format, followed by 64 bits of VENDOR SPECIFIC IDENTIFIER EXTENSION
153 * to complete the payload. These are based from VPD=0x80 PRODUCT SERIAL
154 * NUMBER set via vpd_unit_serial in target_core_configfs.c to ensure
155 * per device uniqeness.
156 */
157 for (cnt = 0; *p && cnt < 13; p++) {
158 int val = hex_to_bin(*p);
159
160 if (val < 0)
161 continue;
162
163 if (next) {
164 next = false;
165 buf[cnt++] |= val;
166 } else {
167 next = true;
168 buf[cnt] = val << 4;
169 }
170 }
171 }
172
173 /*
174 * Device identification VPD, for a complete list of
175 * DESIGNATOR TYPEs see spc4r17 Table 459.
176 */
177 sense_reason_t
spc_emulate_evpd_83(struct se_cmd * cmd,unsigned char * buf)178 spc_emulate_evpd_83(struct se_cmd *cmd, unsigned char *buf)
179 {
180 struct se_device *dev = cmd->se_dev;
181 struct se_lun *lun = cmd->se_lun;
182 struct se_port *port = NULL;
183 struct se_portal_group *tpg = NULL;
184 struct t10_alua_lu_gp_member *lu_gp_mem;
185 struct t10_alua_tg_pt_gp *tg_pt_gp;
186 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
187 unsigned char *prod = &dev->t10_wwn.model[0];
188 u32 prod_len;
189 u32 unit_serial_len, off = 0;
190 u16 len = 0, id_len;
191
192 off = 4;
193
194 /*
195 * NAA IEEE Registered Extended Assigned designator format, see
196 * spc4r17 section 7.7.3.6.5
197 *
198 * We depend upon a target_core_mod/ConfigFS provided
199 * /sys/kernel/config/target/core/$HBA/$DEV/wwn/vpd_unit_serial
200 * value in order to return the NAA id.
201 */
202 if (!(dev->dev_flags & DF_EMULATED_VPD_UNIT_SERIAL))
203 goto check_t10_vend_desc;
204
205 /* CODE SET == Binary */
206 buf[off++] = 0x1;
207
208 /* Set ASSOCIATION == addressed logical unit: 0)b */
209 buf[off] = 0x00;
210
211 /* Identifier/Designator type == NAA identifier */
212 buf[off++] |= 0x3;
213 off++;
214
215 /* Identifier/Designator length */
216 buf[off++] = 0x10;
217
218 /*
219 * Start NAA IEEE Registered Extended Identifier/Designator
220 */
221 buf[off++] = (0x6 << 4);
222
223 /*
224 * Use OpenFabrics IEEE Company ID: 00 14 05
225 */
226 buf[off++] = 0x01;
227 buf[off++] = 0x40;
228 buf[off] = (0x5 << 4);
229
230 /*
231 * Return ConfigFS Unit Serial Number information for
232 * VENDOR_SPECIFIC_IDENTIFIER and
233 * VENDOR_SPECIFIC_IDENTIFIER_EXTENTION
234 */
235 spc_parse_naa_6h_vendor_specific(dev, &buf[off]);
236
237 len = 20;
238 off = (len + 4);
239
240 check_t10_vend_desc:
241 /*
242 * T10 Vendor Identifier Page, see spc4r17 section 7.7.3.4
243 */
244 id_len = 8; /* For Vendor field */
245 prod_len = 4; /* For VPD Header */
246 prod_len += 8; /* For Vendor field */
247 prod_len += strlen(prod);
248 prod_len++; /* For : */
249
250 if (dev->dev_flags & DF_EMULATED_VPD_UNIT_SERIAL) {
251 unit_serial_len = strlen(&dev->t10_wwn.unit_serial[0]);
252 unit_serial_len++; /* For NULL Terminator */
253
254 id_len += sprintf(&buf[off+12], "%s:%s", prod,
255 &dev->t10_wwn.unit_serial[0]);
256 }
257 buf[off] = 0x2; /* ASCII */
258 buf[off+1] = 0x1; /* T10 Vendor ID */
259 buf[off+2] = 0x0;
260 memcpy(&buf[off+4], "LIO-ORG", 8);
261 /* Extra Byte for NULL Terminator */
262 id_len++;
263 /* Identifier Length */
264 buf[off+3] = id_len;
265 /* Header size for Designation descriptor */
266 len += (id_len + 4);
267 off += (id_len + 4);
268 /*
269 * struct se_port is only set for INQUIRY VPD=1 through $FABRIC_MOD
270 */
271 port = lun->lun_sep;
272 if (port) {
273 struct t10_alua_lu_gp *lu_gp;
274 u32 padding, scsi_name_len, scsi_target_len;
275 u16 lu_gp_id = 0;
276 u16 tg_pt_gp_id = 0;
277 u16 tpgt;
278
279 tpg = port->sep_tpg;
280 /*
281 * Relative target port identifer, see spc4r17
282 * section 7.7.3.7
283 *
284 * Get the PROTOCOL IDENTIFIER as defined by spc4r17
285 * section 7.5.1 Table 362
286 */
287 buf[off] =
288 (tpg->se_tpg_tfo->get_fabric_proto_ident(tpg) << 4);
289 buf[off++] |= 0x1; /* CODE SET == Binary */
290 buf[off] = 0x80; /* Set PIV=1 */
291 /* Set ASSOCIATION == target port: 01b */
292 buf[off] |= 0x10;
293 /* DESIGNATOR TYPE == Relative target port identifer */
294 buf[off++] |= 0x4;
295 off++; /* Skip over Reserved */
296 buf[off++] = 4; /* DESIGNATOR LENGTH */
297 /* Skip over Obsolete field in RTPI payload
298 * in Table 472 */
299 off += 2;
300 buf[off++] = ((port->sep_rtpi >> 8) & 0xff);
301 buf[off++] = (port->sep_rtpi & 0xff);
302 len += 8; /* Header size + Designation descriptor */
303 /*
304 * Target port group identifier, see spc4r17
305 * section 7.7.3.8
306 *
307 * Get the PROTOCOL IDENTIFIER as defined by spc4r17
308 * section 7.5.1 Table 362
309 */
310 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
311 if (!tg_pt_gp_mem)
312 goto check_lu_gp;
313
314 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
315 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
316 if (!tg_pt_gp) {
317 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
318 goto check_lu_gp;
319 }
320 tg_pt_gp_id = tg_pt_gp->tg_pt_gp_id;
321 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
322
323 buf[off] =
324 (tpg->se_tpg_tfo->get_fabric_proto_ident(tpg) << 4);
325 buf[off++] |= 0x1; /* CODE SET == Binary */
326 buf[off] = 0x80; /* Set PIV=1 */
327 /* Set ASSOCIATION == target port: 01b */
328 buf[off] |= 0x10;
329 /* DESIGNATOR TYPE == Target port group identifier */
330 buf[off++] |= 0x5;
331 off++; /* Skip over Reserved */
332 buf[off++] = 4; /* DESIGNATOR LENGTH */
333 off += 2; /* Skip over Reserved Field */
334 buf[off++] = ((tg_pt_gp_id >> 8) & 0xff);
335 buf[off++] = (tg_pt_gp_id & 0xff);
336 len += 8; /* Header size + Designation descriptor */
337 /*
338 * Logical Unit Group identifier, see spc4r17
339 * section 7.7.3.8
340 */
341 check_lu_gp:
342 lu_gp_mem = dev->dev_alua_lu_gp_mem;
343 if (!lu_gp_mem)
344 goto check_scsi_name;
345
346 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
347 lu_gp = lu_gp_mem->lu_gp;
348 if (!lu_gp) {
349 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
350 goto check_scsi_name;
351 }
352 lu_gp_id = lu_gp->lu_gp_id;
353 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
354
355 buf[off++] |= 0x1; /* CODE SET == Binary */
356 /* DESIGNATOR TYPE == Logical Unit Group identifier */
357 buf[off++] |= 0x6;
358 off++; /* Skip over Reserved */
359 buf[off++] = 4; /* DESIGNATOR LENGTH */
360 off += 2; /* Skip over Reserved Field */
361 buf[off++] = ((lu_gp_id >> 8) & 0xff);
362 buf[off++] = (lu_gp_id & 0xff);
363 len += 8; /* Header size + Designation descriptor */
364 /*
365 * SCSI name string designator, see spc4r17
366 * section 7.7.3.11
367 *
368 * Get the PROTOCOL IDENTIFIER as defined by spc4r17
369 * section 7.5.1 Table 362
370 */
371 check_scsi_name:
372 buf[off] =
373 (tpg->se_tpg_tfo->get_fabric_proto_ident(tpg) << 4);
374 buf[off++] |= 0x3; /* CODE SET == UTF-8 */
375 buf[off] = 0x80; /* Set PIV=1 */
376 /* Set ASSOCIATION == target port: 01b */
377 buf[off] |= 0x10;
378 /* DESIGNATOR TYPE == SCSI name string */
379 buf[off++] |= 0x8;
380 off += 2; /* Skip over Reserved and length */
381 /*
382 * SCSI name string identifer containing, $FABRIC_MOD
383 * dependent information. For LIO-Target and iSCSI
384 * Target Port, this means "<iSCSI name>,t,0x<TPGT> in
385 * UTF-8 encoding.
386 */
387 tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg);
388 scsi_name_len = sprintf(&buf[off], "%s,t,0x%04x",
389 tpg->se_tpg_tfo->tpg_get_wwn(tpg), tpgt);
390 scsi_name_len += 1 /* Include NULL terminator */;
391 /*
392 * The null-terminated, null-padded (see 4.4.2) SCSI
393 * NAME STRING field contains a UTF-8 format string.
394 * The number of bytes in the SCSI NAME STRING field
395 * (i.e., the value in the DESIGNATOR LENGTH field)
396 * shall be no larger than 256 and shall be a multiple
397 * of four.
398 */
399 padding = ((-scsi_name_len) & 3);
400 if (padding)
401 scsi_name_len += padding;
402 if (scsi_name_len > 256)
403 scsi_name_len = 256;
404
405 buf[off-1] = scsi_name_len;
406 off += scsi_name_len;
407 /* Header size + Designation descriptor */
408 len += (scsi_name_len + 4);
409
410 /*
411 * Target device designator
412 */
413 buf[off] =
414 (tpg->se_tpg_tfo->get_fabric_proto_ident(tpg) << 4);
415 buf[off++] |= 0x3; /* CODE SET == UTF-8 */
416 buf[off] = 0x80; /* Set PIV=1 */
417 /* Set ASSOCIATION == target device: 10b */
418 buf[off] |= 0x20;
419 /* DESIGNATOR TYPE == SCSI name string */
420 buf[off++] |= 0x8;
421 off += 2; /* Skip over Reserved and length */
422 /*
423 * SCSI name string identifer containing, $FABRIC_MOD
424 * dependent information. For LIO-Target and iSCSI
425 * Target Port, this means "<iSCSI name>" in
426 * UTF-8 encoding.
427 */
428 scsi_target_len = sprintf(&buf[off], "%s",
429 tpg->se_tpg_tfo->tpg_get_wwn(tpg));
430 scsi_target_len += 1 /* Include NULL terminator */;
431 /*
432 * The null-terminated, null-padded (see 4.4.2) SCSI
433 * NAME STRING field contains a UTF-8 format string.
434 * The number of bytes in the SCSI NAME STRING field
435 * (i.e., the value in the DESIGNATOR LENGTH field)
436 * shall be no larger than 256 and shall be a multiple
437 * of four.
438 */
439 padding = ((-scsi_target_len) & 3);
440 if (padding)
441 scsi_target_len += padding;
442 if (scsi_target_len > 256)
443 scsi_target_len = 256;
444
445 buf[off-1] = scsi_target_len;
446 off += scsi_target_len;
447
448 /* Header size + Designation descriptor */
449 len += (scsi_target_len + 4);
450 }
451 buf[2] = ((len >> 8) & 0xff);
452 buf[3] = (len & 0xff); /* Page Length for VPD 0x83 */
453 return 0;
454 }
455 EXPORT_SYMBOL(spc_emulate_evpd_83);
456
457 static bool
spc_check_dev_wce(struct se_device * dev)458 spc_check_dev_wce(struct se_device *dev)
459 {
460 bool wce = false;
461
462 if (dev->transport->get_write_cache)
463 wce = dev->transport->get_write_cache(dev);
464 else if (dev->dev_attrib.emulate_write_cache > 0)
465 wce = true;
466
467 return wce;
468 }
469
470 /* Extended INQUIRY Data VPD Page */
471 static sense_reason_t
spc_emulate_evpd_86(struct se_cmd * cmd,unsigned char * buf)472 spc_emulate_evpd_86(struct se_cmd *cmd, unsigned char *buf)
473 {
474 struct se_device *dev = cmd->se_dev;
475 struct se_session *sess = cmd->se_sess;
476
477 buf[3] = 0x3c;
478 /*
479 * Set GRD_CHK + REF_CHK for TYPE1 protection, or GRD_CHK
480 * only for TYPE3 protection.
481 */
482 if (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) {
483 if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE1_PROT)
484 buf[4] = 0x5;
485 else if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE3_PROT)
486 buf[4] = 0x4;
487 }
488
489 /* Set HEADSUP, ORDSUP, SIMPSUP */
490 buf[5] = 0x07;
491
492 /* If WriteCache emulation is enabled, set V_SUP */
493 if (spc_check_dev_wce(dev))
494 buf[6] = 0x01;
495 /* If an LBA map is present set R_SUP */
496 spin_lock(&cmd->se_dev->t10_alua.lba_map_lock);
497 if (!list_empty(&dev->t10_alua.lba_map_list))
498 buf[8] = 0x10;
499 spin_unlock(&cmd->se_dev->t10_alua.lba_map_lock);
500 return 0;
501 }
502
503 /* Block Limits VPD page */
504 static sense_reason_t
spc_emulate_evpd_b0(struct se_cmd * cmd,unsigned char * buf)505 spc_emulate_evpd_b0(struct se_cmd *cmd, unsigned char *buf)
506 {
507 struct se_device *dev = cmd->se_dev;
508 int have_tp = 0;
509 int opt, min;
510
511 /*
512 * Following spc3r22 section 6.5.3 Block Limits VPD page, when
513 * emulate_tpu=1 or emulate_tpws=1 we will be expect a
514 * different page length for Thin Provisioning.
515 */
516 if (dev->dev_attrib.emulate_tpu || dev->dev_attrib.emulate_tpws)
517 have_tp = 1;
518
519 buf[0] = dev->transport->get_device_type(dev);
520 buf[3] = have_tp ? 0x3c : 0x10;
521
522 /* Set WSNZ to 1 */
523 buf[4] = 0x01;
524 /*
525 * Set MAXIMUM COMPARE AND WRITE LENGTH
526 */
527 if (dev->dev_attrib.emulate_caw)
528 buf[5] = 0x01;
529
530 /*
531 * Set OPTIMAL TRANSFER LENGTH GRANULARITY
532 */
533 if (dev->transport->get_io_min && (min = dev->transport->get_io_min(dev)))
534 put_unaligned_be16(min / dev->dev_attrib.block_size, &buf[6]);
535 else
536 put_unaligned_be16(1, &buf[6]);
537
538 /*
539 * Set MAXIMUM TRANSFER LENGTH
540 */
541 put_unaligned_be32(dev->dev_attrib.hw_max_sectors, &buf[8]);
542
543 /*
544 * Set OPTIMAL TRANSFER LENGTH
545 */
546 if (dev->transport->get_io_opt && (opt = dev->transport->get_io_opt(dev)))
547 put_unaligned_be32(opt / dev->dev_attrib.block_size, &buf[12]);
548 else
549 put_unaligned_be32(dev->dev_attrib.optimal_sectors, &buf[12]);
550
551 /*
552 * Exit now if we don't support TP.
553 */
554 if (!have_tp)
555 goto max_write_same;
556
557 /*
558 * Set MAXIMUM UNMAP LBA COUNT
559 */
560 put_unaligned_be32(dev->dev_attrib.max_unmap_lba_count, &buf[20]);
561
562 /*
563 * Set MAXIMUM UNMAP BLOCK DESCRIPTOR COUNT
564 */
565 put_unaligned_be32(dev->dev_attrib.max_unmap_block_desc_count,
566 &buf[24]);
567
568 /*
569 * Set OPTIMAL UNMAP GRANULARITY
570 */
571 put_unaligned_be32(dev->dev_attrib.unmap_granularity, &buf[28]);
572
573 /*
574 * UNMAP GRANULARITY ALIGNMENT
575 */
576 put_unaligned_be32(dev->dev_attrib.unmap_granularity_alignment,
577 &buf[32]);
578 if (dev->dev_attrib.unmap_granularity_alignment != 0)
579 buf[32] |= 0x80; /* Set the UGAVALID bit */
580
581 /*
582 * MAXIMUM WRITE SAME LENGTH
583 */
584 max_write_same:
585 put_unaligned_be64(dev->dev_attrib.max_write_same_len, &buf[36]);
586
587 return 0;
588 }
589
590 /* Block Device Characteristics VPD page */
591 static sense_reason_t
spc_emulate_evpd_b1(struct se_cmd * cmd,unsigned char * buf)592 spc_emulate_evpd_b1(struct se_cmd *cmd, unsigned char *buf)
593 {
594 struct se_device *dev = cmd->se_dev;
595
596 buf[0] = dev->transport->get_device_type(dev);
597 buf[3] = 0x3c;
598 buf[5] = dev->dev_attrib.is_nonrot ? 1 : 0;
599
600 return 0;
601 }
602
603 /* Thin Provisioning VPD */
604 static sense_reason_t
spc_emulate_evpd_b2(struct se_cmd * cmd,unsigned char * buf)605 spc_emulate_evpd_b2(struct se_cmd *cmd, unsigned char *buf)
606 {
607 struct se_device *dev = cmd->se_dev;
608
609 /*
610 * From spc3r22 section 6.5.4 Thin Provisioning VPD page:
611 *
612 * The PAGE LENGTH field is defined in SPC-4. If the DP bit is set to
613 * zero, then the page length shall be set to 0004h. If the DP bit
614 * is set to one, then the page length shall be set to the value
615 * defined in table 162.
616 */
617 buf[0] = dev->transport->get_device_type(dev);
618
619 /*
620 * Set Hardcoded length mentioned above for DP=0
621 */
622 put_unaligned_be16(0x0004, &buf[2]);
623
624 /*
625 * The THRESHOLD EXPONENT field indicates the threshold set size in
626 * LBAs as a power of 2 (i.e., the threshold set size is equal to
627 * 2(threshold exponent)).
628 *
629 * Note that this is currently set to 0x00 as mkp says it will be
630 * changing again. We can enable this once it has settled in T10
631 * and is actually used by Linux/SCSI ML code.
632 */
633 buf[4] = 0x00;
634
635 /*
636 * A TPU bit set to one indicates that the device server supports
637 * the UNMAP command (see 5.25). A TPU bit set to zero indicates
638 * that the device server does not support the UNMAP command.
639 */
640 if (dev->dev_attrib.emulate_tpu != 0)
641 buf[5] = 0x80;
642
643 /*
644 * A TPWS bit set to one indicates that the device server supports
645 * the use of the WRITE SAME (16) command (see 5.42) to unmap LBAs.
646 * A TPWS bit set to zero indicates that the device server does not
647 * support the use of the WRITE SAME (16) command to unmap LBAs.
648 */
649 if (dev->dev_attrib.emulate_tpws != 0)
650 buf[5] |= 0x40;
651
652 return 0;
653 }
654
655 /* Referrals VPD page */
656 static sense_reason_t
spc_emulate_evpd_b3(struct se_cmd * cmd,unsigned char * buf)657 spc_emulate_evpd_b3(struct se_cmd *cmd, unsigned char *buf)
658 {
659 struct se_device *dev = cmd->se_dev;
660
661 buf[0] = dev->transport->get_device_type(dev);
662 buf[3] = 0x0c;
663 put_unaligned_be32(dev->t10_alua.lba_map_segment_size, &buf[8]);
664 put_unaligned_be32(dev->t10_alua.lba_map_segment_multiplier, &buf[12]);
665
666 return 0;
667 }
668
669 static sense_reason_t
670 spc_emulate_evpd_00(struct se_cmd *cmd, unsigned char *buf);
671
672 static struct {
673 uint8_t page;
674 sense_reason_t (*emulate)(struct se_cmd *, unsigned char *);
675 } evpd_handlers[] = {
676 { .page = 0x00, .emulate = spc_emulate_evpd_00 },
677 { .page = 0x80, .emulate = spc_emulate_evpd_80 },
678 { .page = 0x83, .emulate = spc_emulate_evpd_83 },
679 { .page = 0x86, .emulate = spc_emulate_evpd_86 },
680 { .page = 0xb0, .emulate = spc_emulate_evpd_b0 },
681 { .page = 0xb1, .emulate = spc_emulate_evpd_b1 },
682 { .page = 0xb2, .emulate = spc_emulate_evpd_b2 },
683 { .page = 0xb3, .emulate = spc_emulate_evpd_b3 },
684 };
685
686 /* supported vital product data pages */
687 static sense_reason_t
spc_emulate_evpd_00(struct se_cmd * cmd,unsigned char * buf)688 spc_emulate_evpd_00(struct se_cmd *cmd, unsigned char *buf)
689 {
690 int p;
691
692 /*
693 * Only report the INQUIRY EVPD=1 pages after a valid NAA
694 * Registered Extended LUN WWN has been set via ConfigFS
695 * during device creation/restart.
696 */
697 if (cmd->se_dev->dev_flags & DF_EMULATED_VPD_UNIT_SERIAL) {
698 buf[3] = ARRAY_SIZE(evpd_handlers);
699 for (p = 0; p < ARRAY_SIZE(evpd_handlers); ++p)
700 buf[p + 4] = evpd_handlers[p].page;
701 }
702
703 return 0;
704 }
705
706 static sense_reason_t
spc_emulate_inquiry(struct se_cmd * cmd)707 spc_emulate_inquiry(struct se_cmd *cmd)
708 {
709 struct se_device *dev = cmd->se_dev;
710 struct se_portal_group *tpg = cmd->se_lun->lun_sep->sep_tpg;
711 unsigned char *rbuf;
712 unsigned char *cdb = cmd->t_task_cdb;
713 unsigned char *buf;
714 sense_reason_t ret;
715 int p;
716 int len = 0;
717
718 buf = kzalloc(SE_INQUIRY_BUF, GFP_KERNEL);
719 if (!buf) {
720 pr_err("Unable to allocate response buffer for INQUIRY\n");
721 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
722 }
723
724 if (dev == tpg->tpg_virt_lun0.lun_se_dev)
725 buf[0] = 0x3f; /* Not connected */
726 else
727 buf[0] = dev->transport->get_device_type(dev);
728
729 if (!(cdb[1] & 0x1)) {
730 if (cdb[2]) {
731 pr_err("INQUIRY with EVPD==0 but PAGE CODE=%02x\n",
732 cdb[2]);
733 ret = TCM_INVALID_CDB_FIELD;
734 goto out;
735 }
736
737 ret = spc_emulate_inquiry_std(cmd, buf);
738 len = buf[4] + 5;
739 goto out;
740 }
741
742 for (p = 0; p < ARRAY_SIZE(evpd_handlers); ++p) {
743 if (cdb[2] == evpd_handlers[p].page) {
744 buf[1] = cdb[2];
745 ret = evpd_handlers[p].emulate(cmd, buf);
746 len = get_unaligned_be16(&buf[2]) + 4;
747 goto out;
748 }
749 }
750
751 pr_err("Unknown VPD Code: 0x%02x\n", cdb[2]);
752 ret = TCM_INVALID_CDB_FIELD;
753
754 out:
755 rbuf = transport_kmap_data_sg(cmd);
756 if (rbuf) {
757 memcpy(rbuf, buf, min_t(u32, SE_INQUIRY_BUF, cmd->data_length));
758 transport_kunmap_data_sg(cmd);
759 }
760 kfree(buf);
761
762 if (!ret)
763 target_complete_cmd_with_length(cmd, GOOD, len);
764 return ret;
765 }
766
spc_modesense_rwrecovery(struct se_cmd * cmd,u8 pc,u8 * p)767 static int spc_modesense_rwrecovery(struct se_cmd *cmd, u8 pc, u8 *p)
768 {
769 p[0] = 0x01;
770 p[1] = 0x0a;
771
772 /* No changeable values for now */
773 if (pc == 1)
774 goto out;
775
776 out:
777 return 12;
778 }
779
spc_modesense_control(struct se_cmd * cmd,u8 pc,u8 * p)780 static int spc_modesense_control(struct se_cmd *cmd, u8 pc, u8 *p)
781 {
782 struct se_device *dev = cmd->se_dev;
783 struct se_session *sess = cmd->se_sess;
784
785 p[0] = 0x0a;
786 p[1] = 0x0a;
787
788 /* No changeable values for now */
789 if (pc == 1)
790 goto out;
791
792 p[2] = 2;
793 /*
794 * From spc4r23, 7.4.7 Control mode page
795 *
796 * The QUEUE ALGORITHM MODIFIER field (see table 368) specifies
797 * restrictions on the algorithm used for reordering commands
798 * having the SIMPLE task attribute (see SAM-4).
799 *
800 * Table 368 -- QUEUE ALGORITHM MODIFIER field
801 * Code Description
802 * 0h Restricted reordering
803 * 1h Unrestricted reordering allowed
804 * 2h to 7h Reserved
805 * 8h to Fh Vendor specific
806 *
807 * A value of zero in the QUEUE ALGORITHM MODIFIER field specifies that
808 * the device server shall order the processing sequence of commands
809 * having the SIMPLE task attribute such that data integrity is maintained
810 * for that I_T nexus (i.e., if the transmission of new SCSI transport protocol
811 * requests is halted at any time, the final value of all data observable
812 * on the medium shall be the same as if all the commands had been processed
813 * with the ORDERED task attribute).
814 *
815 * A value of one in the QUEUE ALGORITHM MODIFIER field specifies that the
816 * device server may reorder the processing sequence of commands having the
817 * SIMPLE task attribute in any manner. Any data integrity exposures related to
818 * command sequence order shall be explicitly handled by the application client
819 * through the selection of appropriate ommands and task attributes.
820 */
821 p[3] = (dev->dev_attrib.emulate_rest_reord == 1) ? 0x00 : 0x10;
822 /*
823 * From spc4r17, section 7.4.6 Control mode Page
824 *
825 * Unit Attention interlocks control (UN_INTLCK_CTRL) to code 00b
826 *
827 * 00b: The logical unit shall clear any unit attention condition
828 * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION
829 * status and shall not establish a unit attention condition when a com-
830 * mand is completed with BUSY, TASK SET FULL, or RESERVATION CONFLICT
831 * status.
832 *
833 * 10b: The logical unit shall not clear any unit attention condition
834 * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION
835 * status and shall not establish a unit attention condition when
836 * a command is completed with BUSY, TASK SET FULL, or RESERVATION
837 * CONFLICT status.
838 *
839 * 11b a The logical unit shall not clear any unit attention condition
840 * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION
841 * status and shall establish a unit attention condition for the
842 * initiator port associated with the I_T nexus on which the BUSY,
843 * TASK SET FULL, or RESERVATION CONFLICT status is being returned.
844 * Depending on the status, the additional sense code shall be set to
845 * PREVIOUS BUSY STATUS, PREVIOUS TASK SET FULL STATUS, or PREVIOUS
846 * RESERVATION CONFLICT STATUS. Until it is cleared by a REQUEST SENSE
847 * command, a unit attention condition shall be established only once
848 * for a BUSY, TASK SET FULL, or RESERVATION CONFLICT status regardless
849 * to the number of commands completed with one of those status codes.
850 */
851 p[4] = (dev->dev_attrib.emulate_ua_intlck_ctrl == 2) ? 0x30 :
852 (dev->dev_attrib.emulate_ua_intlck_ctrl == 1) ? 0x20 : 0x00;
853 /*
854 * From spc4r17, section 7.4.6 Control mode Page
855 *
856 * Task Aborted Status (TAS) bit set to zero.
857 *
858 * A task aborted status (TAS) bit set to zero specifies that aborted
859 * tasks shall be terminated by the device server without any response
860 * to the application client. A TAS bit set to one specifies that tasks
861 * aborted by the actions of an I_T nexus other than the I_T nexus on
862 * which the command was received shall be completed with TASK ABORTED
863 * status (see SAM-4).
864 */
865 p[5] = (dev->dev_attrib.emulate_tas) ? 0x40 : 0x00;
866 /*
867 * From spc4r30, section 7.5.7 Control mode page
868 *
869 * Application Tag Owner (ATO) bit set to one.
870 *
871 * If the ATO bit is set to one the device server shall not modify the
872 * LOGICAL BLOCK APPLICATION TAG field and, depending on the protection
873 * type, shall not modify the contents of the LOGICAL BLOCK REFERENCE
874 * TAG field.
875 */
876 if (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) {
877 if (dev->dev_attrib.pi_prot_type)
878 p[5] |= 0x80;
879 }
880
881 p[8] = 0xff;
882 p[9] = 0xff;
883 p[11] = 30;
884
885 out:
886 return 12;
887 }
888
spc_modesense_caching(struct se_cmd * cmd,u8 pc,u8 * p)889 static int spc_modesense_caching(struct se_cmd *cmd, u8 pc, u8 *p)
890 {
891 struct se_device *dev = cmd->se_dev;
892
893 p[0] = 0x08;
894 p[1] = 0x12;
895
896 /* No changeable values for now */
897 if (pc == 1)
898 goto out;
899
900 if (spc_check_dev_wce(dev))
901 p[2] = 0x04; /* Write Cache Enable */
902 p[12] = 0x20; /* Disabled Read Ahead */
903
904 out:
905 return 20;
906 }
907
spc_modesense_informational_exceptions(struct se_cmd * cmd,u8 pc,unsigned char * p)908 static int spc_modesense_informational_exceptions(struct se_cmd *cmd, u8 pc, unsigned char *p)
909 {
910 p[0] = 0x1c;
911 p[1] = 0x0a;
912
913 /* No changeable values for now */
914 if (pc == 1)
915 goto out;
916
917 out:
918 return 12;
919 }
920
921 static struct {
922 uint8_t page;
923 uint8_t subpage;
924 int (*emulate)(struct se_cmd *, u8, unsigned char *);
925 } modesense_handlers[] = {
926 { .page = 0x01, .subpage = 0x00, .emulate = spc_modesense_rwrecovery },
927 { .page = 0x08, .subpage = 0x00, .emulate = spc_modesense_caching },
928 { .page = 0x0a, .subpage = 0x00, .emulate = spc_modesense_control },
929 { .page = 0x1c, .subpage = 0x00, .emulate = spc_modesense_informational_exceptions },
930 };
931
spc_modesense_write_protect(unsigned char * buf,int type)932 static void spc_modesense_write_protect(unsigned char *buf, int type)
933 {
934 /*
935 * I believe that the WP bit (bit 7) in the mode header is the same for
936 * all device types..
937 */
938 switch (type) {
939 case TYPE_DISK:
940 case TYPE_TAPE:
941 default:
942 buf[0] |= 0x80; /* WP bit */
943 break;
944 }
945 }
946
spc_modesense_dpofua(unsigned char * buf,int type)947 static void spc_modesense_dpofua(unsigned char *buf, int type)
948 {
949 switch (type) {
950 case TYPE_DISK:
951 buf[0] |= 0x10; /* DPOFUA bit */
952 break;
953 default:
954 break;
955 }
956 }
957
spc_modesense_blockdesc(unsigned char * buf,u64 blocks,u32 block_size)958 static int spc_modesense_blockdesc(unsigned char *buf, u64 blocks, u32 block_size)
959 {
960 *buf++ = 8;
961 put_unaligned_be32(min(blocks, 0xffffffffull), buf);
962 buf += 4;
963 put_unaligned_be32(block_size, buf);
964 return 9;
965 }
966
spc_modesense_long_blockdesc(unsigned char * buf,u64 blocks,u32 block_size)967 static int spc_modesense_long_blockdesc(unsigned char *buf, u64 blocks, u32 block_size)
968 {
969 if (blocks <= 0xffffffff)
970 return spc_modesense_blockdesc(buf + 3, blocks, block_size) + 3;
971
972 *buf++ = 1; /* LONGLBA */
973 buf += 2;
974 *buf++ = 16;
975 put_unaligned_be64(blocks, buf);
976 buf += 12;
977 put_unaligned_be32(block_size, buf);
978
979 return 17;
980 }
981
spc_emulate_modesense(struct se_cmd * cmd)982 static sense_reason_t spc_emulate_modesense(struct se_cmd *cmd)
983 {
984 struct se_device *dev = cmd->se_dev;
985 char *cdb = cmd->t_task_cdb;
986 unsigned char buf[SE_MODE_PAGE_BUF], *rbuf;
987 int type = dev->transport->get_device_type(dev);
988 int ten = (cmd->t_task_cdb[0] == MODE_SENSE_10);
989 bool dbd = !!(cdb[1] & 0x08);
990 bool llba = ten ? !!(cdb[1] & 0x10) : false;
991 u8 pc = cdb[2] >> 6;
992 u8 page = cdb[2] & 0x3f;
993 u8 subpage = cdb[3];
994 int length = 0;
995 int ret;
996 int i;
997
998 memset(buf, 0, SE_MODE_PAGE_BUF);
999
1000 /*
1001 * Skip over MODE DATA LENGTH + MEDIUM TYPE fields to byte 3 for
1002 * MODE_SENSE_10 and byte 2 for MODE_SENSE (6).
1003 */
1004 length = ten ? 3 : 2;
1005
1006 /* DEVICE-SPECIFIC PARAMETER */
1007 if ((cmd->se_lun->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY) ||
1008 (cmd->se_deve &&
1009 (cmd->se_deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY)))
1010 spc_modesense_write_protect(&buf[length], type);
1011
1012 if ((spc_check_dev_wce(dev)) &&
1013 (dev->dev_attrib.emulate_fua_write > 0))
1014 spc_modesense_dpofua(&buf[length], type);
1015
1016 ++length;
1017
1018 /* BLOCK DESCRIPTOR */
1019
1020 /*
1021 * For now we only include a block descriptor for disk (SBC)
1022 * devices; other command sets use a slightly different format.
1023 */
1024 if (!dbd && type == TYPE_DISK) {
1025 u64 blocks = dev->transport->get_blocks(dev);
1026 u32 block_size = dev->dev_attrib.block_size;
1027
1028 if (ten) {
1029 if (llba) {
1030 length += spc_modesense_long_blockdesc(&buf[length],
1031 blocks, block_size);
1032 } else {
1033 length += 3;
1034 length += spc_modesense_blockdesc(&buf[length],
1035 blocks, block_size);
1036 }
1037 } else {
1038 length += spc_modesense_blockdesc(&buf[length], blocks,
1039 block_size);
1040 }
1041 } else {
1042 if (ten)
1043 length += 4;
1044 else
1045 length += 1;
1046 }
1047
1048 if (page == 0x3f) {
1049 if (subpage != 0x00 && subpage != 0xff) {
1050 pr_warn("MODE_SENSE: Invalid subpage code: 0x%02x\n", subpage);
1051 return TCM_INVALID_CDB_FIELD;
1052 }
1053
1054 for (i = 0; i < ARRAY_SIZE(modesense_handlers); ++i) {
1055 /*
1056 * Tricky way to say all subpage 00h for
1057 * subpage==0, all subpages for subpage==0xff
1058 * (and we just checked above that those are
1059 * the only two possibilities).
1060 */
1061 if ((modesense_handlers[i].subpage & ~subpage) == 0) {
1062 ret = modesense_handlers[i].emulate(cmd, pc, &buf[length]);
1063 if (!ten && length + ret >= 255)
1064 break;
1065 length += ret;
1066 }
1067 }
1068
1069 goto set_length;
1070 }
1071
1072 for (i = 0; i < ARRAY_SIZE(modesense_handlers); ++i)
1073 if (modesense_handlers[i].page == page &&
1074 modesense_handlers[i].subpage == subpage) {
1075 length += modesense_handlers[i].emulate(cmd, pc, &buf[length]);
1076 goto set_length;
1077 }
1078
1079 /*
1080 * We don't intend to implement:
1081 * - obsolete page 03h "format parameters" (checked by Solaris)
1082 */
1083 if (page != 0x03)
1084 pr_err("MODE SENSE: unimplemented page/subpage: 0x%02x/0x%02x\n",
1085 page, subpage);
1086
1087 return TCM_UNKNOWN_MODE_PAGE;
1088
1089 set_length:
1090 if (ten)
1091 put_unaligned_be16(length - 2, buf);
1092 else
1093 buf[0] = length - 1;
1094
1095 rbuf = transport_kmap_data_sg(cmd);
1096 if (rbuf) {
1097 memcpy(rbuf, buf, min_t(u32, SE_MODE_PAGE_BUF, cmd->data_length));
1098 transport_kunmap_data_sg(cmd);
1099 }
1100
1101 target_complete_cmd_with_length(cmd, GOOD, length);
1102 return 0;
1103 }
1104
spc_emulate_modeselect(struct se_cmd * cmd)1105 static sense_reason_t spc_emulate_modeselect(struct se_cmd *cmd)
1106 {
1107 char *cdb = cmd->t_task_cdb;
1108 bool ten = cdb[0] == MODE_SELECT_10;
1109 int off = ten ? 8 : 4;
1110 bool pf = !!(cdb[1] & 0x10);
1111 u8 page, subpage;
1112 unsigned char *buf;
1113 unsigned char tbuf[SE_MODE_PAGE_BUF];
1114 int length;
1115 int ret = 0;
1116 int i;
1117
1118 if (!cmd->data_length) {
1119 target_complete_cmd(cmd, GOOD);
1120 return 0;
1121 }
1122
1123 if (cmd->data_length < off + 2)
1124 return TCM_PARAMETER_LIST_LENGTH_ERROR;
1125
1126 buf = transport_kmap_data_sg(cmd);
1127 if (!buf)
1128 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1129
1130 if (!pf) {
1131 ret = TCM_INVALID_CDB_FIELD;
1132 goto out;
1133 }
1134
1135 page = buf[off] & 0x3f;
1136 subpage = buf[off] & 0x40 ? buf[off + 1] : 0;
1137
1138 for (i = 0; i < ARRAY_SIZE(modesense_handlers); ++i)
1139 if (modesense_handlers[i].page == page &&
1140 modesense_handlers[i].subpage == subpage) {
1141 memset(tbuf, 0, SE_MODE_PAGE_BUF);
1142 length = modesense_handlers[i].emulate(cmd, 0, tbuf);
1143 goto check_contents;
1144 }
1145
1146 ret = TCM_UNKNOWN_MODE_PAGE;
1147 goto out;
1148
1149 check_contents:
1150 if (cmd->data_length < off + length) {
1151 ret = TCM_PARAMETER_LIST_LENGTH_ERROR;
1152 goto out;
1153 }
1154
1155 if (memcmp(buf + off, tbuf, length))
1156 ret = TCM_INVALID_PARAMETER_LIST;
1157
1158 out:
1159 transport_kunmap_data_sg(cmd);
1160
1161 if (!ret)
1162 target_complete_cmd(cmd, GOOD);
1163 return ret;
1164 }
1165
spc_emulate_request_sense(struct se_cmd * cmd)1166 static sense_reason_t spc_emulate_request_sense(struct se_cmd *cmd)
1167 {
1168 unsigned char *cdb = cmd->t_task_cdb;
1169 unsigned char *rbuf;
1170 u8 ua_asc = 0, ua_ascq = 0;
1171 unsigned char buf[SE_SENSE_BUF];
1172
1173 memset(buf, 0, SE_SENSE_BUF);
1174
1175 if (cdb[1] & 0x01) {
1176 pr_err("REQUEST_SENSE description emulation not"
1177 " supported\n");
1178 return TCM_INVALID_CDB_FIELD;
1179 }
1180
1181 rbuf = transport_kmap_data_sg(cmd);
1182 if (!rbuf)
1183 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1184
1185 if (!core_scsi3_ua_clear_for_request_sense(cmd, &ua_asc, &ua_ascq)) {
1186 /*
1187 * CURRENT ERROR, UNIT ATTENTION
1188 */
1189 buf[0] = 0x70;
1190 buf[SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
1191
1192 /*
1193 * The Additional Sense Code (ASC) from the UNIT ATTENTION
1194 */
1195 buf[SPC_ASC_KEY_OFFSET] = ua_asc;
1196 buf[SPC_ASCQ_KEY_OFFSET] = ua_ascq;
1197 buf[7] = 0x0A;
1198 } else {
1199 /*
1200 * CURRENT ERROR, NO SENSE
1201 */
1202 buf[0] = 0x70;
1203 buf[SPC_SENSE_KEY_OFFSET] = NO_SENSE;
1204
1205 /*
1206 * NO ADDITIONAL SENSE INFORMATION
1207 */
1208 buf[SPC_ASC_KEY_OFFSET] = 0x00;
1209 buf[7] = 0x0A;
1210 }
1211
1212 memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length));
1213 transport_kunmap_data_sg(cmd);
1214
1215 target_complete_cmd(cmd, GOOD);
1216 return 0;
1217 }
1218
spc_emulate_report_luns(struct se_cmd * cmd)1219 sense_reason_t spc_emulate_report_luns(struct se_cmd *cmd)
1220 {
1221 struct se_dev_entry *deve;
1222 struct se_session *sess = cmd->se_sess;
1223 unsigned char *buf;
1224 u32 lun_count = 0, offset = 8, i;
1225
1226 if (cmd->data_length < 16) {
1227 pr_warn("REPORT LUNS allocation length %u too small\n",
1228 cmd->data_length);
1229 return TCM_INVALID_CDB_FIELD;
1230 }
1231
1232 buf = transport_kmap_data_sg(cmd);
1233 if (!buf)
1234 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1235
1236 /*
1237 * If no struct se_session pointer is present, this struct se_cmd is
1238 * coming via a target_core_mod PASSTHROUGH op, and not through
1239 * a $FABRIC_MOD. In that case, report LUN=0 only.
1240 */
1241 if (!sess) {
1242 int_to_scsilun(0, (struct scsi_lun *)&buf[offset]);
1243 lun_count = 1;
1244 goto done;
1245 }
1246
1247 spin_lock_irq(&sess->se_node_acl->device_list_lock);
1248 for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
1249 deve = sess->se_node_acl->device_list[i];
1250 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
1251 continue;
1252 /*
1253 * We determine the correct LUN LIST LENGTH even once we
1254 * have reached the initial allocation length.
1255 * See SPC2-R20 7.19.
1256 */
1257 lun_count++;
1258 if ((offset + 8) > cmd->data_length)
1259 continue;
1260
1261 int_to_scsilun(deve->mapped_lun, (struct scsi_lun *)&buf[offset]);
1262 offset += 8;
1263 }
1264 spin_unlock_irq(&sess->se_node_acl->device_list_lock);
1265
1266 /*
1267 * See SPC3 r07, page 159.
1268 */
1269 done:
1270 lun_count *= 8;
1271 buf[0] = ((lun_count >> 24) & 0xff);
1272 buf[1] = ((lun_count >> 16) & 0xff);
1273 buf[2] = ((lun_count >> 8) & 0xff);
1274 buf[3] = (lun_count & 0xff);
1275 transport_kunmap_data_sg(cmd);
1276
1277 target_complete_cmd_with_length(cmd, GOOD, 8 + lun_count * 8);
1278 return 0;
1279 }
1280 EXPORT_SYMBOL(spc_emulate_report_luns);
1281
1282 static sense_reason_t
spc_emulate_testunitready(struct se_cmd * cmd)1283 spc_emulate_testunitready(struct se_cmd *cmd)
1284 {
1285 target_complete_cmd(cmd, GOOD);
1286 return 0;
1287 }
1288
1289 sense_reason_t
spc_parse_cdb(struct se_cmd * cmd,unsigned int * size)1290 spc_parse_cdb(struct se_cmd *cmd, unsigned int *size)
1291 {
1292 struct se_device *dev = cmd->se_dev;
1293 unsigned char *cdb = cmd->t_task_cdb;
1294
1295 switch (cdb[0]) {
1296 case MODE_SELECT:
1297 *size = cdb[4];
1298 cmd->execute_cmd = spc_emulate_modeselect;
1299 break;
1300 case MODE_SELECT_10:
1301 *size = (cdb[7] << 8) + cdb[8];
1302 cmd->execute_cmd = spc_emulate_modeselect;
1303 break;
1304 case MODE_SENSE:
1305 *size = cdb[4];
1306 cmd->execute_cmd = spc_emulate_modesense;
1307 break;
1308 case MODE_SENSE_10:
1309 *size = (cdb[7] << 8) + cdb[8];
1310 cmd->execute_cmd = spc_emulate_modesense;
1311 break;
1312 case LOG_SELECT:
1313 case LOG_SENSE:
1314 *size = (cdb[7] << 8) + cdb[8];
1315 break;
1316 case PERSISTENT_RESERVE_IN:
1317 *size = (cdb[7] << 8) + cdb[8];
1318 cmd->execute_cmd = target_scsi3_emulate_pr_in;
1319 break;
1320 case PERSISTENT_RESERVE_OUT:
1321 *size = (cdb[7] << 8) + cdb[8];
1322 cmd->execute_cmd = target_scsi3_emulate_pr_out;
1323 break;
1324 case RELEASE:
1325 case RELEASE_10:
1326 if (cdb[0] == RELEASE_10)
1327 *size = (cdb[7] << 8) | cdb[8];
1328 else
1329 *size = cmd->data_length;
1330
1331 cmd->execute_cmd = target_scsi2_reservation_release;
1332 break;
1333 case RESERVE:
1334 case RESERVE_10:
1335 /*
1336 * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
1337 * Assume the passthrough or $FABRIC_MOD will tell us about it.
1338 */
1339 if (cdb[0] == RESERVE_10)
1340 *size = (cdb[7] << 8) | cdb[8];
1341 else
1342 *size = cmd->data_length;
1343
1344 cmd->execute_cmd = target_scsi2_reservation_reserve;
1345 break;
1346 case REQUEST_SENSE:
1347 *size = cdb[4];
1348 cmd->execute_cmd = spc_emulate_request_sense;
1349 break;
1350 case INQUIRY:
1351 *size = (cdb[3] << 8) + cdb[4];
1352
1353 /*
1354 * Do implicit HEAD_OF_QUEUE processing for INQUIRY.
1355 * See spc4r17 section 5.3
1356 */
1357 cmd->sam_task_attr = MSG_HEAD_TAG;
1358 cmd->execute_cmd = spc_emulate_inquiry;
1359 break;
1360 case SECURITY_PROTOCOL_IN:
1361 case SECURITY_PROTOCOL_OUT:
1362 *size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
1363 break;
1364 case EXTENDED_COPY:
1365 *size = get_unaligned_be32(&cdb[10]);
1366 cmd->execute_cmd = target_do_xcopy;
1367 break;
1368 case RECEIVE_COPY_RESULTS:
1369 *size = get_unaligned_be32(&cdb[10]);
1370 cmd->execute_cmd = target_do_receive_copy_results;
1371 break;
1372 case READ_ATTRIBUTE:
1373 case WRITE_ATTRIBUTE:
1374 *size = (cdb[10] << 24) | (cdb[11] << 16) |
1375 (cdb[12] << 8) | cdb[13];
1376 break;
1377 case RECEIVE_DIAGNOSTIC:
1378 case SEND_DIAGNOSTIC:
1379 *size = (cdb[3] << 8) | cdb[4];
1380 break;
1381 case WRITE_BUFFER:
1382 *size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
1383 break;
1384 case REPORT_LUNS:
1385 cmd->execute_cmd = spc_emulate_report_luns;
1386 *size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
1387 /*
1388 * Do implicit HEAD_OF_QUEUE processing for REPORT_LUNS
1389 * See spc4r17 section 5.3
1390 */
1391 cmd->sam_task_attr = MSG_HEAD_TAG;
1392 break;
1393 case TEST_UNIT_READY:
1394 cmd->execute_cmd = spc_emulate_testunitready;
1395 *size = 0;
1396 break;
1397 case MAINTENANCE_IN:
1398 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
1399 /*
1400 * MAINTENANCE_IN from SCC-2
1401 * Check for emulated MI_REPORT_TARGET_PGS
1402 */
1403 if ((cdb[1] & 0x1f) == MI_REPORT_TARGET_PGS) {
1404 cmd->execute_cmd =
1405 target_emulate_report_target_port_groups;
1406 }
1407 *size = get_unaligned_be32(&cdb[6]);
1408 } else {
1409 /*
1410 * GPCMD_SEND_KEY from multi media commands
1411 */
1412 *size = get_unaligned_be16(&cdb[8]);
1413 }
1414 break;
1415 case MAINTENANCE_OUT:
1416 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
1417 /*
1418 * MAINTENANCE_OUT from SCC-2
1419 * Check for emulated MO_SET_TARGET_PGS.
1420 */
1421 if (cdb[1] == MO_SET_TARGET_PGS) {
1422 cmd->execute_cmd =
1423 target_emulate_set_target_port_groups;
1424 }
1425 *size = get_unaligned_be32(&cdb[6]);
1426 } else {
1427 /*
1428 * GPCMD_SEND_KEY from multi media commands
1429 */
1430 *size = get_unaligned_be16(&cdb[8]);
1431 }
1432 break;
1433 default:
1434 pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode"
1435 " 0x%02x, sending CHECK_CONDITION.\n",
1436 cmd->se_tfo->get_fabric_name(), cdb[0]);
1437 return TCM_UNSUPPORTED_SCSI_OPCODE;
1438 }
1439
1440 return 0;
1441 }
1442 EXPORT_SYMBOL(spc_parse_cdb);
1443