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target: do not reject FUA CDBs when write cache is enabled but emulate_write_cache...
[deliverable/linux.git] / drivers / target / target_core_spc.c
1 /*
2 * SCSI Primary Commands (SPC) parsing and emulation.
3 *
4 * (c) Copyright 2002-2013 Datera, Inc.
5 *
6 * Nicholas A. Bellinger <nab@kernel.org>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
21 */
22
23 #include <linux/kernel.h>
24 #include <linux/module.h>
25 #include <asm/unaligned.h>
26
27 #include <scsi/scsi.h>
28 #include <scsi/scsi_tcq.h>
29
30 #include <target/target_core_base.h>
31 #include <target/target_core_backend.h>
32 #include <target/target_core_fabric.h>
33
34 #include "target_core_internal.h"
35 #include "target_core_alua.h"
36 #include "target_core_pr.h"
37 #include "target_core_ua.h"
38 #include "target_core_xcopy.h"
39
40 static void spc_fill_alua_data(struct se_port *port, unsigned char *buf)
41 {
42 struct t10_alua_tg_pt_gp *tg_pt_gp;
43 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
44
45 /*
46 * Set SCCS for MAINTENANCE_IN + REPORT_TARGET_PORT_GROUPS.
47 */
48 buf[5] = 0x80;
49
50 /*
51 * Set TPGS field for explicit and/or implicit ALUA access type
52 * and opteration.
53 *
54 * See spc4r17 section 6.4.2 Table 135
55 */
56 if (!port)
57 return;
58 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
59 if (!tg_pt_gp_mem)
60 return;
61
62 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
63 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
64 if (tg_pt_gp)
65 buf[5] |= tg_pt_gp->tg_pt_gp_alua_access_type;
66 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
67 }
68
69 sense_reason_t
70 spc_emulate_inquiry_std(struct se_cmd *cmd, unsigned char *buf)
71 {
72 struct se_lun *lun = cmd->se_lun;
73 struct se_device *dev = cmd->se_dev;
74 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
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
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
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 /* Extended INQUIRY Data VPD Page */
458 static sense_reason_t
459 spc_emulate_evpd_86(struct se_cmd *cmd, unsigned char *buf)
460 {
461 struct se_device *dev = cmd->se_dev;
462 struct se_session *sess = cmd->se_sess;
463
464 buf[3] = 0x3c;
465 /*
466 * Set GRD_CHK + REF_CHK for TYPE1 protection, or GRD_CHK
467 * only for TYPE3 protection.
468 */
469 if (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) {
470 if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE1_PROT)
471 buf[4] = 0x5;
472 else if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE3_PROT)
473 buf[4] = 0x4;
474 }
475
476 /* Set HEADSUP, ORDSUP, SIMPSUP */
477 buf[5] = 0x07;
478
479 /* If WriteCache emulation is enabled, set V_SUP */
480 if (se_dev_check_wce(dev))
481 buf[6] = 0x01;
482 /* If an LBA map is present set R_SUP */
483 spin_lock(&cmd->se_dev->t10_alua.lba_map_lock);
484 if (!list_empty(&dev->t10_alua.lba_map_list))
485 buf[8] = 0x10;
486 spin_unlock(&cmd->se_dev->t10_alua.lba_map_lock);
487 return 0;
488 }
489
490 /* Block Limits VPD page */
491 static sense_reason_t
492 spc_emulate_evpd_b0(struct se_cmd *cmd, unsigned char *buf)
493 {
494 struct se_device *dev = cmd->se_dev;
495 int have_tp = 0;
496 int opt, min;
497
498 /*
499 * Following spc3r22 section 6.5.3 Block Limits VPD page, when
500 * emulate_tpu=1 or emulate_tpws=1 we will be expect a
501 * different page length for Thin Provisioning.
502 */
503 if (dev->dev_attrib.emulate_tpu || dev->dev_attrib.emulate_tpws)
504 have_tp = 1;
505
506 buf[0] = dev->transport->get_device_type(dev);
507 buf[3] = have_tp ? 0x3c : 0x10;
508
509 /* Set WSNZ to 1 */
510 buf[4] = 0x01;
511 /*
512 * Set MAXIMUM COMPARE AND WRITE LENGTH
513 */
514 if (dev->dev_attrib.emulate_caw)
515 buf[5] = 0x01;
516
517 /*
518 * Set OPTIMAL TRANSFER LENGTH GRANULARITY
519 */
520 if (dev->transport->get_io_min && (min = dev->transport->get_io_min(dev)))
521 put_unaligned_be16(min / dev->dev_attrib.block_size, &buf[6]);
522 else
523 put_unaligned_be16(1, &buf[6]);
524
525 /*
526 * Set MAXIMUM TRANSFER LENGTH
527 */
528 put_unaligned_be32(dev->dev_attrib.hw_max_sectors, &buf[8]);
529
530 /*
531 * Set OPTIMAL TRANSFER LENGTH
532 */
533 if (dev->transport->get_io_opt && (opt = dev->transport->get_io_opt(dev)))
534 put_unaligned_be32(opt / dev->dev_attrib.block_size, &buf[12]);
535 else
536 put_unaligned_be32(dev->dev_attrib.optimal_sectors, &buf[12]);
537
538 /*
539 * Exit now if we don't support TP.
540 */
541 if (!have_tp)
542 goto max_write_same;
543
544 /*
545 * Set MAXIMUM UNMAP LBA COUNT
546 */
547 put_unaligned_be32(dev->dev_attrib.max_unmap_lba_count, &buf[20]);
548
549 /*
550 * Set MAXIMUM UNMAP BLOCK DESCRIPTOR COUNT
551 */
552 put_unaligned_be32(dev->dev_attrib.max_unmap_block_desc_count,
553 &buf[24]);
554
555 /*
556 * Set OPTIMAL UNMAP GRANULARITY
557 */
558 put_unaligned_be32(dev->dev_attrib.unmap_granularity, &buf[28]);
559
560 /*
561 * UNMAP GRANULARITY ALIGNMENT
562 */
563 put_unaligned_be32(dev->dev_attrib.unmap_granularity_alignment,
564 &buf[32]);
565 if (dev->dev_attrib.unmap_granularity_alignment != 0)
566 buf[32] |= 0x80; /* Set the UGAVALID bit */
567
568 /*
569 * MAXIMUM WRITE SAME LENGTH
570 */
571 max_write_same:
572 put_unaligned_be64(dev->dev_attrib.max_write_same_len, &buf[36]);
573
574 return 0;
575 }
576
577 /* Block Device Characteristics VPD page */
578 static sense_reason_t
579 spc_emulate_evpd_b1(struct se_cmd *cmd, unsigned char *buf)
580 {
581 struct se_device *dev = cmd->se_dev;
582
583 buf[0] = dev->transport->get_device_type(dev);
584 buf[3] = 0x3c;
585 buf[5] = dev->dev_attrib.is_nonrot ? 1 : 0;
586
587 return 0;
588 }
589
590 /* Thin Provisioning VPD */
591 static sense_reason_t
592 spc_emulate_evpd_b2(struct se_cmd *cmd, unsigned char *buf)
593 {
594 struct se_device *dev = cmd->se_dev;
595
596 /*
597 * From spc3r22 section 6.5.4 Thin Provisioning VPD page:
598 *
599 * The PAGE LENGTH field is defined in SPC-4. If the DP bit is set to
600 * zero, then the page length shall be set to 0004h. If the DP bit
601 * is set to one, then the page length shall be set to the value
602 * defined in table 162.
603 */
604 buf[0] = dev->transport->get_device_type(dev);
605
606 /*
607 * Set Hardcoded length mentioned above for DP=0
608 */
609 put_unaligned_be16(0x0004, &buf[2]);
610
611 /*
612 * The THRESHOLD EXPONENT field indicates the threshold set size in
613 * LBAs as a power of 2 (i.e., the threshold set size is equal to
614 * 2(threshold exponent)).
615 *
616 * Note that this is currently set to 0x00 as mkp says it will be
617 * changing again. We can enable this once it has settled in T10
618 * and is actually used by Linux/SCSI ML code.
619 */
620 buf[4] = 0x00;
621
622 /*
623 * A TPU bit set to one indicates that the device server supports
624 * the UNMAP command (see 5.25). A TPU bit set to zero indicates
625 * that the device server does not support the UNMAP command.
626 */
627 if (dev->dev_attrib.emulate_tpu != 0)
628 buf[5] = 0x80;
629
630 /*
631 * A TPWS bit set to one indicates that the device server supports
632 * the use of the WRITE SAME (16) command (see 5.42) to unmap LBAs.
633 * A TPWS bit set to zero indicates that the device server does not
634 * support the use of the WRITE SAME (16) command to unmap LBAs.
635 */
636 if (dev->dev_attrib.emulate_tpws != 0)
637 buf[5] |= 0x40 | 0x20;
638
639 return 0;
640 }
641
642 /* Referrals VPD page */
643 static sense_reason_t
644 spc_emulate_evpd_b3(struct se_cmd *cmd, unsigned char *buf)
645 {
646 struct se_device *dev = cmd->se_dev;
647
648 buf[0] = dev->transport->get_device_type(dev);
649 buf[3] = 0x0c;
650 put_unaligned_be32(dev->t10_alua.lba_map_segment_size, &buf[8]);
651 put_unaligned_be32(dev->t10_alua.lba_map_segment_multiplier, &buf[12]);
652
653 return 0;
654 }
655
656 static sense_reason_t
657 spc_emulate_evpd_00(struct se_cmd *cmd, unsigned char *buf);
658
659 static struct {
660 uint8_t page;
661 sense_reason_t (*emulate)(struct se_cmd *, unsigned char *);
662 } evpd_handlers[] = {
663 { .page = 0x00, .emulate = spc_emulate_evpd_00 },
664 { .page = 0x80, .emulate = spc_emulate_evpd_80 },
665 { .page = 0x83, .emulate = spc_emulate_evpd_83 },
666 { .page = 0x86, .emulate = spc_emulate_evpd_86 },
667 { .page = 0xb0, .emulate = spc_emulate_evpd_b0 },
668 { .page = 0xb1, .emulate = spc_emulate_evpd_b1 },
669 { .page = 0xb2, .emulate = spc_emulate_evpd_b2 },
670 { .page = 0xb3, .emulate = spc_emulate_evpd_b3 },
671 };
672
673 /* supported vital product data pages */
674 static sense_reason_t
675 spc_emulate_evpd_00(struct se_cmd *cmd, unsigned char *buf)
676 {
677 int p;
678
679 /*
680 * Only report the INQUIRY EVPD=1 pages after a valid NAA
681 * Registered Extended LUN WWN has been set via ConfigFS
682 * during device creation/restart.
683 */
684 if (cmd->se_dev->dev_flags & DF_EMULATED_VPD_UNIT_SERIAL) {
685 buf[3] = ARRAY_SIZE(evpd_handlers);
686 for (p = 0; p < ARRAY_SIZE(evpd_handlers); ++p)
687 buf[p + 4] = evpd_handlers[p].page;
688 }
689
690 return 0;
691 }
692
693 static sense_reason_t
694 spc_emulate_inquiry(struct se_cmd *cmd)
695 {
696 struct se_device *dev = cmd->se_dev;
697 struct se_portal_group *tpg = cmd->se_lun->lun_sep->sep_tpg;
698 unsigned char *rbuf;
699 unsigned char *cdb = cmd->t_task_cdb;
700 unsigned char *buf;
701 sense_reason_t ret;
702 int p;
703 int len = 0;
704
705 buf = kzalloc(SE_INQUIRY_BUF, GFP_KERNEL);
706 if (!buf) {
707 pr_err("Unable to allocate response buffer for INQUIRY\n");
708 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
709 }
710
711 if (dev == tpg->tpg_virt_lun0.lun_se_dev)
712 buf[0] = 0x3f; /* Not connected */
713 else
714 buf[0] = dev->transport->get_device_type(dev);
715
716 if (!(cdb[1] & 0x1)) {
717 if (cdb[2]) {
718 pr_err("INQUIRY with EVPD==0 but PAGE CODE=%02x\n",
719 cdb[2]);
720 ret = TCM_INVALID_CDB_FIELD;
721 goto out;
722 }
723
724 ret = spc_emulate_inquiry_std(cmd, buf);
725 len = buf[4] + 5;
726 goto out;
727 }
728
729 for (p = 0; p < ARRAY_SIZE(evpd_handlers); ++p) {
730 if (cdb[2] == evpd_handlers[p].page) {
731 buf[1] = cdb[2];
732 ret = evpd_handlers[p].emulate(cmd, buf);
733 len = get_unaligned_be16(&buf[2]) + 4;
734 goto out;
735 }
736 }
737
738 pr_err("Unknown VPD Code: 0x%02x\n", cdb[2]);
739 ret = TCM_INVALID_CDB_FIELD;
740
741 out:
742 rbuf = transport_kmap_data_sg(cmd);
743 if (rbuf) {
744 memcpy(rbuf, buf, min_t(u32, SE_INQUIRY_BUF, cmd->data_length));
745 transport_kunmap_data_sg(cmd);
746 }
747 kfree(buf);
748
749 if (!ret)
750 target_complete_cmd_with_length(cmd, GOOD, len);
751 return ret;
752 }
753
754 static int spc_modesense_rwrecovery(struct se_cmd *cmd, u8 pc, u8 *p)
755 {
756 p[0] = 0x01;
757 p[1] = 0x0a;
758
759 /* No changeable values for now */
760 if (pc == 1)
761 goto out;
762
763 out:
764 return 12;
765 }
766
767 static int spc_modesense_control(struct se_cmd *cmd, u8 pc, u8 *p)
768 {
769 struct se_device *dev = cmd->se_dev;
770 struct se_session *sess = cmd->se_sess;
771
772 p[0] = 0x0a;
773 p[1] = 0x0a;
774
775 /* No changeable values for now */
776 if (pc == 1)
777 goto out;
778
779 p[2] = 2;
780 /*
781 * From spc4r23, 7.4.7 Control mode page
782 *
783 * The QUEUE ALGORITHM MODIFIER field (see table 368) specifies
784 * restrictions on the algorithm used for reordering commands
785 * having the SIMPLE task attribute (see SAM-4).
786 *
787 * Table 368 -- QUEUE ALGORITHM MODIFIER field
788 * Code Description
789 * 0h Restricted reordering
790 * 1h Unrestricted reordering allowed
791 * 2h to 7h Reserved
792 * 8h to Fh Vendor specific
793 *
794 * A value of zero in the QUEUE ALGORITHM MODIFIER field specifies that
795 * the device server shall order the processing sequence of commands
796 * having the SIMPLE task attribute such that data integrity is maintained
797 * for that I_T nexus (i.e., if the transmission of new SCSI transport protocol
798 * requests is halted at any time, the final value of all data observable
799 * on the medium shall be the same as if all the commands had been processed
800 * with the ORDERED task attribute).
801 *
802 * A value of one in the QUEUE ALGORITHM MODIFIER field specifies that the
803 * device server may reorder the processing sequence of commands having the
804 * SIMPLE task attribute in any manner. Any data integrity exposures related to
805 * command sequence order shall be explicitly handled by the application client
806 * through the selection of appropriate ommands and task attributes.
807 */
808 p[3] = (dev->dev_attrib.emulate_rest_reord == 1) ? 0x00 : 0x10;
809 /*
810 * From spc4r17, section 7.4.6 Control mode Page
811 *
812 * Unit Attention interlocks control (UN_INTLCK_CTRL) to code 00b
813 *
814 * 00b: The logical unit shall clear any unit attention condition
815 * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION
816 * status and shall not establish a unit attention condition when a com-
817 * mand is completed with BUSY, TASK SET FULL, or RESERVATION CONFLICT
818 * status.
819 *
820 * 10b: The logical unit shall not clear any unit attention condition
821 * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION
822 * status and shall not establish a unit attention condition when
823 * a command is completed with BUSY, TASK SET FULL, or RESERVATION
824 * CONFLICT status.
825 *
826 * 11b a The logical unit shall not clear any unit attention condition
827 * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION
828 * status and shall establish a unit attention condition for the
829 * initiator port associated with the I_T nexus on which the BUSY,
830 * TASK SET FULL, or RESERVATION CONFLICT status is being returned.
831 * Depending on the status, the additional sense code shall be set to
832 * PREVIOUS BUSY STATUS, PREVIOUS TASK SET FULL STATUS, or PREVIOUS
833 * RESERVATION CONFLICT STATUS. Until it is cleared by a REQUEST SENSE
834 * command, a unit attention condition shall be established only once
835 * for a BUSY, TASK SET FULL, or RESERVATION CONFLICT status regardless
836 * to the number of commands completed with one of those status codes.
837 */
838 p[4] = (dev->dev_attrib.emulate_ua_intlck_ctrl == 2) ? 0x30 :
839 (dev->dev_attrib.emulate_ua_intlck_ctrl == 1) ? 0x20 : 0x00;
840 /*
841 * From spc4r17, section 7.4.6 Control mode Page
842 *
843 * Task Aborted Status (TAS) bit set to zero.
844 *
845 * A task aborted status (TAS) bit set to zero specifies that aborted
846 * tasks shall be terminated by the device server without any response
847 * to the application client. A TAS bit set to one specifies that tasks
848 * aborted by the actions of an I_T nexus other than the I_T nexus on
849 * which the command was received shall be completed with TASK ABORTED
850 * status (see SAM-4).
851 */
852 p[5] = (dev->dev_attrib.emulate_tas) ? 0x40 : 0x00;
853 /*
854 * From spc4r30, section 7.5.7 Control mode page
855 *
856 * Application Tag Owner (ATO) bit set to one.
857 *
858 * If the ATO bit is set to one the device server shall not modify the
859 * LOGICAL BLOCK APPLICATION TAG field and, depending on the protection
860 * type, shall not modify the contents of the LOGICAL BLOCK REFERENCE
861 * TAG field.
862 */
863 if (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) {
864 if (dev->dev_attrib.pi_prot_type)
865 p[5] |= 0x80;
866 }
867
868 p[8] = 0xff;
869 p[9] = 0xff;
870 p[11] = 30;
871
872 out:
873 return 12;
874 }
875
876 static int spc_modesense_caching(struct se_cmd *cmd, u8 pc, u8 *p)
877 {
878 struct se_device *dev = cmd->se_dev;
879
880 p[0] = 0x08;
881 p[1] = 0x12;
882
883 /* No changeable values for now */
884 if (pc == 1)
885 goto out;
886
887 if (se_dev_check_wce(dev))
888 p[2] = 0x04; /* Write Cache Enable */
889 p[12] = 0x20; /* Disabled Read Ahead */
890
891 out:
892 return 20;
893 }
894
895 static int spc_modesense_informational_exceptions(struct se_cmd *cmd, u8 pc, unsigned char *p)
896 {
897 p[0] = 0x1c;
898 p[1] = 0x0a;
899
900 /* No changeable values for now */
901 if (pc == 1)
902 goto out;
903
904 out:
905 return 12;
906 }
907
908 static struct {
909 uint8_t page;
910 uint8_t subpage;
911 int (*emulate)(struct se_cmd *, u8, unsigned char *);
912 } modesense_handlers[] = {
913 { .page = 0x01, .subpage = 0x00, .emulate = spc_modesense_rwrecovery },
914 { .page = 0x08, .subpage = 0x00, .emulate = spc_modesense_caching },
915 { .page = 0x0a, .subpage = 0x00, .emulate = spc_modesense_control },
916 { .page = 0x1c, .subpage = 0x00, .emulate = spc_modesense_informational_exceptions },
917 };
918
919 static void spc_modesense_write_protect(unsigned char *buf, int type)
920 {
921 /*
922 * I believe that the WP bit (bit 7) in the mode header is the same for
923 * all device types..
924 */
925 switch (type) {
926 case TYPE_DISK:
927 case TYPE_TAPE:
928 default:
929 buf[0] |= 0x80; /* WP bit */
930 break;
931 }
932 }
933
934 static void spc_modesense_dpofua(unsigned char *buf, int type)
935 {
936 switch (type) {
937 case TYPE_DISK:
938 buf[0] |= 0x10; /* DPOFUA bit */
939 break;
940 default:
941 break;
942 }
943 }
944
945 static int spc_modesense_blockdesc(unsigned char *buf, u64 blocks, u32 block_size)
946 {
947 *buf++ = 8;
948 put_unaligned_be32(min(blocks, 0xffffffffull), buf);
949 buf += 4;
950 put_unaligned_be32(block_size, buf);
951 return 9;
952 }
953
954 static int spc_modesense_long_blockdesc(unsigned char *buf, u64 blocks, u32 block_size)
955 {
956 if (blocks <= 0xffffffff)
957 return spc_modesense_blockdesc(buf + 3, blocks, block_size) + 3;
958
959 *buf++ = 1; /* LONGLBA */
960 buf += 2;
961 *buf++ = 16;
962 put_unaligned_be64(blocks, buf);
963 buf += 12;
964 put_unaligned_be32(block_size, buf);
965
966 return 17;
967 }
968
969 static sense_reason_t spc_emulate_modesense(struct se_cmd *cmd)
970 {
971 struct se_device *dev = cmd->se_dev;
972 char *cdb = cmd->t_task_cdb;
973 unsigned char buf[SE_MODE_PAGE_BUF], *rbuf;
974 int type = dev->transport->get_device_type(dev);
975 int ten = (cmd->t_task_cdb[0] == MODE_SENSE_10);
976 bool dbd = !!(cdb[1] & 0x08);
977 bool llba = ten ? !!(cdb[1] & 0x10) : false;
978 u8 pc = cdb[2] >> 6;
979 u8 page = cdb[2] & 0x3f;
980 u8 subpage = cdb[3];
981 int length = 0;
982 int ret;
983 int i;
984
985 memset(buf, 0, SE_MODE_PAGE_BUF);
986
987 /*
988 * Skip over MODE DATA LENGTH + MEDIUM TYPE fields to byte 3 for
989 * MODE_SENSE_10 and byte 2 for MODE_SENSE (6).
990 */
991 length = ten ? 3 : 2;
992
993 /* DEVICE-SPECIFIC PARAMETER */
994 if ((cmd->se_lun->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY) ||
995 (cmd->se_deve &&
996 (cmd->se_deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY)))
997 spc_modesense_write_protect(&buf[length], type);
998
999 if ((se_dev_check_wce(dev)) &&
1000 (dev->dev_attrib.emulate_fua_write > 0))
1001 spc_modesense_dpofua(&buf[length], type);
1002
1003 ++length;
1004
1005 /* BLOCK DESCRIPTOR */
1006
1007 /*
1008 * For now we only include a block descriptor for disk (SBC)
1009 * devices; other command sets use a slightly different format.
1010 */
1011 if (!dbd && type == TYPE_DISK) {
1012 u64 blocks = dev->transport->get_blocks(dev);
1013 u32 block_size = dev->dev_attrib.block_size;
1014
1015 if (ten) {
1016 if (llba) {
1017 length += spc_modesense_long_blockdesc(&buf[length],
1018 blocks, block_size);
1019 } else {
1020 length += 3;
1021 length += spc_modesense_blockdesc(&buf[length],
1022 blocks, block_size);
1023 }
1024 } else {
1025 length += spc_modesense_blockdesc(&buf[length], blocks,
1026 block_size);
1027 }
1028 } else {
1029 if (ten)
1030 length += 4;
1031 else
1032 length += 1;
1033 }
1034
1035 if (page == 0x3f) {
1036 if (subpage != 0x00 && subpage != 0xff) {
1037 pr_warn("MODE_SENSE: Invalid subpage code: 0x%02x\n", subpage);
1038 return TCM_INVALID_CDB_FIELD;
1039 }
1040
1041 for (i = 0; i < ARRAY_SIZE(modesense_handlers); ++i) {
1042 /*
1043 * Tricky way to say all subpage 00h for
1044 * subpage==0, all subpages for subpage==0xff
1045 * (and we just checked above that those are
1046 * the only two possibilities).
1047 */
1048 if ((modesense_handlers[i].subpage & ~subpage) == 0) {
1049 ret = modesense_handlers[i].emulate(cmd, pc, &buf[length]);
1050 if (!ten && length + ret >= 255)
1051 break;
1052 length += ret;
1053 }
1054 }
1055
1056 goto set_length;
1057 }
1058
1059 for (i = 0; i < ARRAY_SIZE(modesense_handlers); ++i)
1060 if (modesense_handlers[i].page == page &&
1061 modesense_handlers[i].subpage == subpage) {
1062 length += modesense_handlers[i].emulate(cmd, pc, &buf[length]);
1063 goto set_length;
1064 }
1065
1066 /*
1067 * We don't intend to implement:
1068 * - obsolete page 03h "format parameters" (checked by Solaris)
1069 */
1070 if (page != 0x03)
1071 pr_err("MODE SENSE: unimplemented page/subpage: 0x%02x/0x%02x\n",
1072 page, subpage);
1073
1074 return TCM_UNKNOWN_MODE_PAGE;
1075
1076 set_length:
1077 if (ten)
1078 put_unaligned_be16(length - 2, buf);
1079 else
1080 buf[0] = length - 1;
1081
1082 rbuf = transport_kmap_data_sg(cmd);
1083 if (rbuf) {
1084 memcpy(rbuf, buf, min_t(u32, SE_MODE_PAGE_BUF, cmd->data_length));
1085 transport_kunmap_data_sg(cmd);
1086 }
1087
1088 target_complete_cmd_with_length(cmd, GOOD, length);
1089 return 0;
1090 }
1091
1092 static sense_reason_t spc_emulate_modeselect(struct se_cmd *cmd)
1093 {
1094 char *cdb = cmd->t_task_cdb;
1095 bool ten = cdb[0] == MODE_SELECT_10;
1096 int off = ten ? 8 : 4;
1097 bool pf = !!(cdb[1] & 0x10);
1098 u8 page, subpage;
1099 unsigned char *buf;
1100 unsigned char tbuf[SE_MODE_PAGE_BUF];
1101 int length;
1102 int ret = 0;
1103 int i;
1104
1105 if (!cmd->data_length) {
1106 target_complete_cmd(cmd, GOOD);
1107 return 0;
1108 }
1109
1110 if (cmd->data_length < off + 2)
1111 return TCM_PARAMETER_LIST_LENGTH_ERROR;
1112
1113 buf = transport_kmap_data_sg(cmd);
1114 if (!buf)
1115 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1116
1117 if (!pf) {
1118 ret = TCM_INVALID_CDB_FIELD;
1119 goto out;
1120 }
1121
1122 page = buf[off] & 0x3f;
1123 subpage = buf[off] & 0x40 ? buf[off + 1] : 0;
1124
1125 for (i = 0; i < ARRAY_SIZE(modesense_handlers); ++i)
1126 if (modesense_handlers[i].page == page &&
1127 modesense_handlers[i].subpage == subpage) {
1128 memset(tbuf, 0, SE_MODE_PAGE_BUF);
1129 length = modesense_handlers[i].emulate(cmd, 0, tbuf);
1130 goto check_contents;
1131 }
1132
1133 ret = TCM_UNKNOWN_MODE_PAGE;
1134 goto out;
1135
1136 check_contents:
1137 if (cmd->data_length < off + length) {
1138 ret = TCM_PARAMETER_LIST_LENGTH_ERROR;
1139 goto out;
1140 }
1141
1142 if (memcmp(buf + off, tbuf, length))
1143 ret = TCM_INVALID_PARAMETER_LIST;
1144
1145 out:
1146 transport_kunmap_data_sg(cmd);
1147
1148 if (!ret)
1149 target_complete_cmd(cmd, GOOD);
1150 return ret;
1151 }
1152
1153 static sense_reason_t spc_emulate_request_sense(struct se_cmd *cmd)
1154 {
1155 unsigned char *cdb = cmd->t_task_cdb;
1156 unsigned char *rbuf;
1157 u8 ua_asc = 0, ua_ascq = 0;
1158 unsigned char buf[SE_SENSE_BUF];
1159
1160 memset(buf, 0, SE_SENSE_BUF);
1161
1162 if (cdb[1] & 0x01) {
1163 pr_err("REQUEST_SENSE description emulation not"
1164 " supported\n");
1165 return TCM_INVALID_CDB_FIELD;
1166 }
1167
1168 rbuf = transport_kmap_data_sg(cmd);
1169 if (!rbuf)
1170 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1171
1172 if (!core_scsi3_ua_clear_for_request_sense(cmd, &ua_asc, &ua_ascq)) {
1173 /*
1174 * CURRENT ERROR, UNIT ATTENTION
1175 */
1176 buf[0] = 0x70;
1177 buf[SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
1178
1179 /*
1180 * The Additional Sense Code (ASC) from the UNIT ATTENTION
1181 */
1182 buf[SPC_ASC_KEY_OFFSET] = ua_asc;
1183 buf[SPC_ASCQ_KEY_OFFSET] = ua_ascq;
1184 buf[7] = 0x0A;
1185 } else {
1186 /*
1187 * CURRENT ERROR, NO SENSE
1188 */
1189 buf[0] = 0x70;
1190 buf[SPC_SENSE_KEY_OFFSET] = NO_SENSE;
1191
1192 /*
1193 * NO ADDITIONAL SENSE INFORMATION
1194 */
1195 buf[SPC_ASC_KEY_OFFSET] = 0x00;
1196 buf[7] = 0x0A;
1197 }
1198
1199 memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length));
1200 transport_kunmap_data_sg(cmd);
1201
1202 target_complete_cmd(cmd, GOOD);
1203 return 0;
1204 }
1205
1206 sense_reason_t spc_emulate_report_luns(struct se_cmd *cmd)
1207 {
1208 struct se_dev_entry *deve;
1209 struct se_session *sess = cmd->se_sess;
1210 unsigned char *buf;
1211 u32 lun_count = 0, offset = 8, i;
1212
1213 if (cmd->data_length < 16) {
1214 pr_warn("REPORT LUNS allocation length %u too small\n",
1215 cmd->data_length);
1216 return TCM_INVALID_CDB_FIELD;
1217 }
1218
1219 buf = transport_kmap_data_sg(cmd);
1220 if (!buf)
1221 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1222
1223 /*
1224 * If no struct se_session pointer is present, this struct se_cmd is
1225 * coming via a target_core_mod PASSTHROUGH op, and not through
1226 * a $FABRIC_MOD. In that case, report LUN=0 only.
1227 */
1228 if (!sess) {
1229 int_to_scsilun(0, (struct scsi_lun *)&buf[offset]);
1230 lun_count = 1;
1231 goto done;
1232 }
1233
1234 spin_lock_irq(&sess->se_node_acl->device_list_lock);
1235 for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
1236 deve = sess->se_node_acl->device_list[i];
1237 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
1238 continue;
1239 /*
1240 * We determine the correct LUN LIST LENGTH even once we
1241 * have reached the initial allocation length.
1242 * See SPC2-R20 7.19.
1243 */
1244 lun_count++;
1245 if ((offset + 8) > cmd->data_length)
1246 continue;
1247
1248 int_to_scsilun(deve->mapped_lun, (struct scsi_lun *)&buf[offset]);
1249 offset += 8;
1250 }
1251 spin_unlock_irq(&sess->se_node_acl->device_list_lock);
1252
1253 /*
1254 * See SPC3 r07, page 159.
1255 */
1256 done:
1257 lun_count *= 8;
1258 buf[0] = ((lun_count >> 24) & 0xff);
1259 buf[1] = ((lun_count >> 16) & 0xff);
1260 buf[2] = ((lun_count >> 8) & 0xff);
1261 buf[3] = (lun_count & 0xff);
1262 transport_kunmap_data_sg(cmd);
1263
1264 target_complete_cmd_with_length(cmd, GOOD, 8 + lun_count * 8);
1265 return 0;
1266 }
1267 EXPORT_SYMBOL(spc_emulate_report_luns);
1268
1269 static sense_reason_t
1270 spc_emulate_testunitready(struct se_cmd *cmd)
1271 {
1272 target_complete_cmd(cmd, GOOD);
1273 return 0;
1274 }
1275
1276 sense_reason_t
1277 spc_parse_cdb(struct se_cmd *cmd, unsigned int *size)
1278 {
1279 struct se_device *dev = cmd->se_dev;
1280 unsigned char *cdb = cmd->t_task_cdb;
1281
1282 switch (cdb[0]) {
1283 case MODE_SELECT:
1284 *size = cdb[4];
1285 cmd->execute_cmd = spc_emulate_modeselect;
1286 break;
1287 case MODE_SELECT_10:
1288 *size = (cdb[7] << 8) + cdb[8];
1289 cmd->execute_cmd = spc_emulate_modeselect;
1290 break;
1291 case MODE_SENSE:
1292 *size = cdb[4];
1293 cmd->execute_cmd = spc_emulate_modesense;
1294 break;
1295 case MODE_SENSE_10:
1296 *size = (cdb[7] << 8) + cdb[8];
1297 cmd->execute_cmd = spc_emulate_modesense;
1298 break;
1299 case LOG_SELECT:
1300 case LOG_SENSE:
1301 *size = (cdb[7] << 8) + cdb[8];
1302 break;
1303 case PERSISTENT_RESERVE_IN:
1304 *size = (cdb[7] << 8) + cdb[8];
1305 cmd->execute_cmd = target_scsi3_emulate_pr_in;
1306 break;
1307 case PERSISTENT_RESERVE_OUT:
1308 *size = (cdb[7] << 8) + cdb[8];
1309 cmd->execute_cmd = target_scsi3_emulate_pr_out;
1310 break;
1311 case RELEASE:
1312 case RELEASE_10:
1313 if (cdb[0] == RELEASE_10)
1314 *size = (cdb[7] << 8) | cdb[8];
1315 else
1316 *size = cmd->data_length;
1317
1318 cmd->execute_cmd = target_scsi2_reservation_release;
1319 break;
1320 case RESERVE:
1321 case RESERVE_10:
1322 /*
1323 * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
1324 * Assume the passthrough or $FABRIC_MOD will tell us about it.
1325 */
1326 if (cdb[0] == RESERVE_10)
1327 *size = (cdb[7] << 8) | cdb[8];
1328 else
1329 *size = cmd->data_length;
1330
1331 cmd->execute_cmd = target_scsi2_reservation_reserve;
1332 break;
1333 case REQUEST_SENSE:
1334 *size = cdb[4];
1335 cmd->execute_cmd = spc_emulate_request_sense;
1336 break;
1337 case INQUIRY:
1338 *size = (cdb[3] << 8) + cdb[4];
1339
1340 /*
1341 * Do implicit HEAD_OF_QUEUE processing for INQUIRY.
1342 * See spc4r17 section 5.3
1343 */
1344 cmd->sam_task_attr = TCM_HEAD_TAG;
1345 cmd->execute_cmd = spc_emulate_inquiry;
1346 break;
1347 case SECURITY_PROTOCOL_IN:
1348 case SECURITY_PROTOCOL_OUT:
1349 *size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
1350 break;
1351 case EXTENDED_COPY:
1352 *size = get_unaligned_be32(&cdb[10]);
1353 cmd->execute_cmd = target_do_xcopy;
1354 break;
1355 case RECEIVE_COPY_RESULTS:
1356 *size = get_unaligned_be32(&cdb[10]);
1357 cmd->execute_cmd = target_do_receive_copy_results;
1358 break;
1359 case READ_ATTRIBUTE:
1360 case WRITE_ATTRIBUTE:
1361 *size = (cdb[10] << 24) | (cdb[11] << 16) |
1362 (cdb[12] << 8) | cdb[13];
1363 break;
1364 case RECEIVE_DIAGNOSTIC:
1365 case SEND_DIAGNOSTIC:
1366 *size = (cdb[3] << 8) | cdb[4];
1367 break;
1368 case WRITE_BUFFER:
1369 *size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
1370 break;
1371 case REPORT_LUNS:
1372 cmd->execute_cmd = spc_emulate_report_luns;
1373 *size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
1374 /*
1375 * Do implicit HEAD_OF_QUEUE processing for REPORT_LUNS
1376 * See spc4r17 section 5.3
1377 */
1378 cmd->sam_task_attr = TCM_HEAD_TAG;
1379 break;
1380 case TEST_UNIT_READY:
1381 cmd->execute_cmd = spc_emulate_testunitready;
1382 *size = 0;
1383 break;
1384 case MAINTENANCE_IN:
1385 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
1386 /*
1387 * MAINTENANCE_IN from SCC-2
1388 * Check for emulated MI_REPORT_TARGET_PGS
1389 */
1390 if ((cdb[1] & 0x1f) == MI_REPORT_TARGET_PGS) {
1391 cmd->execute_cmd =
1392 target_emulate_report_target_port_groups;
1393 }
1394 *size = get_unaligned_be32(&cdb[6]);
1395 } else {
1396 /*
1397 * GPCMD_SEND_KEY from multi media commands
1398 */
1399 *size = get_unaligned_be16(&cdb[8]);
1400 }
1401 break;
1402 case MAINTENANCE_OUT:
1403 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
1404 /*
1405 * MAINTENANCE_OUT from SCC-2
1406 * Check for emulated MO_SET_TARGET_PGS.
1407 */
1408 if (cdb[1] == MO_SET_TARGET_PGS) {
1409 cmd->execute_cmd =
1410 target_emulate_set_target_port_groups;
1411 }
1412 *size = get_unaligned_be32(&cdb[6]);
1413 } else {
1414 /*
1415 * GPCMD_SEND_KEY from multi media commands
1416 */
1417 *size = get_unaligned_be16(&cdb[8]);
1418 }
1419 break;
1420 default:
1421 pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode"
1422 " 0x%02x, sending CHECK_CONDITION.\n",
1423 cmd->se_tfo->get_fabric_name(), cdb[0]);
1424 return TCM_UNSUPPORTED_SCSI_OPCODE;
1425 }
1426
1427 return 0;
1428 }
1429 EXPORT_SYMBOL(spc_parse_cdb);
Linux kernel - Deliverables
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