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