1 /*
2 * CDB emulation for non-READ/WRITE commands.
3 *
4 * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc.
5 * Copyright (c) 2005, 2006, 2007 SBE, Inc.
6 * Copyright (c) 2007-2010 Rising Tide Systems
7 * Copyright (c) 2008-2010 Linux-iSCSI.org
8 *
9 * Nicholas A. Bellinger <nab@kernel.org>
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
24 */
25
26 #include <linux/kernel.h>
27 #include <linux/module.h>
28 #include <asm/unaligned.h>
29 #include <scsi/scsi.h>
30
31 #include <target/target_core_base.h>
32 #include <target/target_core_backend.h>
33 #include <target/target_core_fabric.h>
34
35 #include "target_core_internal.h"
36 #include "target_core_ua.h"
37
38 static void
target_fill_alua_data(struct se_port * port,unsigned char * buf)39 target_fill_alua_data(struct se_port *port, unsigned char *buf)
40 {
41 struct t10_alua_tg_pt_gp *tg_pt_gp;
42 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
43
44 /*
45 * Set SCCS for MAINTENANCE_IN + REPORT_TARGET_PORT_GROUPS.
46 */
47 buf[5] = 0x80;
48
49 /*
50 * Set TPGS field for explict and/or implict ALUA access type
51 * and opteration.
52 *
53 * See spc4r17 section 6.4.2 Table 135
54 */
55 if (!port)
56 return;
57 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
58 if (!tg_pt_gp_mem)
59 return;
60
61 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
62 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
63 if (tg_pt_gp)
64 buf[5] |= tg_pt_gp->tg_pt_gp_alua_access_type;
65 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
66 }
67
68 static int
target_emulate_inquiry_std(struct se_cmd * cmd)69 target_emulate_inquiry_std(struct se_cmd *cmd)
70 {
71 struct se_lun *lun = cmd->se_lun;
72 struct se_device *dev = cmd->se_dev;
73 struct se_portal_group *tpg = lun->lun_sep->sep_tpg;
74 unsigned char *buf;
75
76 /*
77 * Make sure we at least have 6 bytes of INQUIRY response
78 * payload going back for EVPD=0
79 */
80 if (cmd->data_length < 6) {
81 pr_err("SCSI Inquiry payload length: %u"
82 " too small for EVPD=0\n", cmd->data_length);
83 return -EINVAL;
84 }
85
86 buf = transport_kmap_data_sg(cmd);
87
88 if (dev == tpg->tpg_virt_lun0.lun_se_dev) {
89 buf[0] = 0x3f; /* Not connected */
90 } else {
91 buf[0] = dev->transport->get_device_type(dev);
92 if (buf[0] == TYPE_TAPE)
93 buf[1] = 0x80;
94 }
95 buf[2] = dev->transport->get_device_rev(dev);
96
97 /*
98 * NORMACA and HISUP = 0, RESPONSE DATA FORMAT = 2
99 *
100 * SPC4 says:
101 * A RESPONSE DATA FORMAT field set to 2h indicates that the
102 * standard INQUIRY data is in the format defined in this
103 * standard. Response data format values less than 2h are
104 * obsolete. Response data format values greater than 2h are
105 * reserved.
106 */
107 buf[3] = 2;
108
109 /*
110 * Enable SCCS and TPGS fields for Emulated ALUA
111 */
112 if (dev->se_sub_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED)
113 target_fill_alua_data(lun->lun_sep, buf);
114
115 if (cmd->data_length < 8) {
116 buf[4] = 1; /* Set additional length to 1 */
117 goto out;
118 }
119
120 buf[7] = 0x32; /* Sync=1 and CmdQue=1 */
121
122 /*
123 * Do not include vendor, product, reversion info in INQUIRY
124 * response payload for cdbs with a small allocation length.
125 */
126 if (cmd->data_length < 36) {
127 buf[4] = 3; /* Set additional length to 3 */
128 goto out;
129 }
130
131 snprintf(&buf[8], 8, "LIO-ORG");
132 snprintf(&buf[16], 16, "%s", dev->se_sub_dev->t10_wwn.model);
133 snprintf(&buf[32], 4, "%s", dev->se_sub_dev->t10_wwn.revision);
134 buf[4] = 31; /* Set additional length to 31 */
135
136 out:
137 transport_kunmap_data_sg(cmd);
138 return 0;
139 }
140
141 /* unit serial number */
142 static int
target_emulate_evpd_80(struct se_cmd * cmd,unsigned char * buf)143 target_emulate_evpd_80(struct se_cmd *cmd, unsigned char *buf)
144 {
145 struct se_device *dev = cmd->se_dev;
146 u16 len = 0;
147
148 if (dev->se_sub_dev->su_dev_flags &
149 SDF_EMULATED_VPD_UNIT_SERIAL) {
150 u32 unit_serial_len;
151
152 unit_serial_len = strlen(dev->se_sub_dev->t10_wwn.unit_serial);
153 unit_serial_len++; /* For NULL Terminator */
154
155 if (((len + 4) + unit_serial_len) > cmd->data_length) {
156 len += unit_serial_len;
157 buf[2] = ((len >> 8) & 0xff);
158 buf[3] = (len & 0xff);
159 return 0;
160 }
161 len += sprintf(&buf[4], "%s",
162 dev->se_sub_dev->t10_wwn.unit_serial);
163 len++; /* Extra Byte for NULL Terminator */
164 buf[3] = len;
165 }
166 return 0;
167 }
168
169 static void
target_parse_naa_6h_vendor_specific(struct se_device * dev,unsigned char * buf)170 target_parse_naa_6h_vendor_specific(struct se_device *dev, unsigned char *buf)
171 {
172 unsigned char *p = &dev->se_sub_dev->t10_wwn.unit_serial[0];
173 int cnt;
174 bool next = true;
175
176 /*
177 * Generate up to 36 bits of VENDOR SPECIFIC IDENTIFIER starting on
178 * byte 3 bit 3-0 for NAA IEEE Registered Extended DESIGNATOR field
179 * format, followed by 64 bits of VENDOR SPECIFIC IDENTIFIER EXTENSION
180 * to complete the payload. These are based from VPD=0x80 PRODUCT SERIAL
181 * NUMBER set via vpd_unit_serial in target_core_configfs.c to ensure
182 * per device uniqeness.
183 */
184 for (cnt = 0; *p && cnt < 13; p++) {
185 int val = hex_to_bin(*p);
186
187 if (val < 0)
188 continue;
189
190 if (next) {
191 next = false;
192 buf[cnt++] |= val;
193 } else {
194 next = true;
195 buf[cnt] = val << 4;
196 }
197 }
198 }
199
200 /*
201 * Device identification VPD, for a complete list of
202 * DESIGNATOR TYPEs see spc4r17 Table 459.
203 */
204 static int
target_emulate_evpd_83(struct se_cmd * cmd,unsigned char * buf)205 target_emulate_evpd_83(struct se_cmd *cmd, unsigned char *buf)
206 {
207 struct se_device *dev = cmd->se_dev;
208 struct se_lun *lun = cmd->se_lun;
209 struct se_port *port = NULL;
210 struct se_portal_group *tpg = NULL;
211 struct t10_alua_lu_gp_member *lu_gp_mem;
212 struct t10_alua_tg_pt_gp *tg_pt_gp;
213 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
214 unsigned char *prod = &dev->se_sub_dev->t10_wwn.model[0];
215 u32 prod_len;
216 u32 unit_serial_len, off = 0;
217 u16 len = 0, id_len;
218
219 off = 4;
220
221 /*
222 * NAA IEEE Registered Extended Assigned designator format, see
223 * spc4r17 section 7.7.3.6.5
224 *
225 * We depend upon a target_core_mod/ConfigFS provided
226 * /sys/kernel/config/target/core/$HBA/$DEV/wwn/vpd_unit_serial
227 * value in order to return the NAA id.
228 */
229 if (!(dev->se_sub_dev->su_dev_flags & SDF_EMULATED_VPD_UNIT_SERIAL))
230 goto check_t10_vend_desc;
231
232 if (off + 20 > cmd->data_length)
233 goto check_t10_vend_desc;
234
235 /* CODE SET == Binary */
236 buf[off++] = 0x1;
237
238 /* Set ASSOCIATION == addressed logical unit: 0)b */
239 buf[off] = 0x00;
240
241 /* Identifier/Designator type == NAA identifier */
242 buf[off++] |= 0x3;
243 off++;
244
245 /* Identifier/Designator length */
246 buf[off++] = 0x10;
247
248 /*
249 * Start NAA IEEE Registered Extended Identifier/Designator
250 */
251 buf[off++] = (0x6 << 4);
252
253 /*
254 * Use OpenFabrics IEEE Company ID: 00 14 05
255 */
256 buf[off++] = 0x01;
257 buf[off++] = 0x40;
258 buf[off] = (0x5 << 4);
259
260 /*
261 * Return ConfigFS Unit Serial Number information for
262 * VENDOR_SPECIFIC_IDENTIFIER and
263 * VENDOR_SPECIFIC_IDENTIFIER_EXTENTION
264 */
265 target_parse_naa_6h_vendor_specific(dev, &buf[off]);
266
267 len = 20;
268 off = (len + 4);
269
270 check_t10_vend_desc:
271 /*
272 * T10 Vendor Identifier Page, see spc4r17 section 7.7.3.4
273 */
274 id_len = 8; /* For Vendor field */
275 prod_len = 4; /* For VPD Header */
276 prod_len += 8; /* For Vendor field */
277 prod_len += strlen(prod);
278 prod_len++; /* For : */
279
280 if (dev->se_sub_dev->su_dev_flags &
281 SDF_EMULATED_VPD_UNIT_SERIAL) {
282 unit_serial_len =
283 strlen(&dev->se_sub_dev->t10_wwn.unit_serial[0]);
284 unit_serial_len++; /* For NULL Terminator */
285
286 if ((len + (id_len + 4) +
287 (prod_len + unit_serial_len)) >
288 cmd->data_length) {
289 len += (prod_len + unit_serial_len);
290 goto check_port;
291 }
292 id_len += sprintf(&buf[off+12], "%s:%s", prod,
293 &dev->se_sub_dev->t10_wwn.unit_serial[0]);
294 }
295 buf[off] = 0x2; /* ASCII */
296 buf[off+1] = 0x1; /* T10 Vendor ID */
297 buf[off+2] = 0x0;
298 memcpy(&buf[off+4], "LIO-ORG", 8);
299 /* Extra Byte for NULL Terminator */
300 id_len++;
301 /* Identifier Length */
302 buf[off+3] = id_len;
303 /* Header size for Designation descriptor */
304 len += (id_len + 4);
305 off += (id_len + 4);
306 /*
307 * struct se_port is only set for INQUIRY VPD=1 through $FABRIC_MOD
308 */
309 check_port:
310 port = lun->lun_sep;
311 if (port) {
312 struct t10_alua_lu_gp *lu_gp;
313 u32 padding, scsi_name_len;
314 u16 lu_gp_id = 0;
315 u16 tg_pt_gp_id = 0;
316 u16 tpgt;
317
318 tpg = port->sep_tpg;
319 /*
320 * Relative target port identifer, see spc4r17
321 * section 7.7.3.7
322 *
323 * Get the PROTOCOL IDENTIFIER as defined by spc4r17
324 * section 7.5.1 Table 362
325 */
326 if (((len + 4) + 8) > cmd->data_length) {
327 len += 8;
328 goto check_tpgi;
329 }
330 buf[off] =
331 (tpg->se_tpg_tfo->get_fabric_proto_ident(tpg) << 4);
332 buf[off++] |= 0x1; /* CODE SET == Binary */
333 buf[off] = 0x80; /* Set PIV=1 */
334 /* Set ASSOCIATION == target port: 01b */
335 buf[off] |= 0x10;
336 /* DESIGNATOR TYPE == Relative target port identifer */
337 buf[off++] |= 0x4;
338 off++; /* Skip over Reserved */
339 buf[off++] = 4; /* DESIGNATOR LENGTH */
340 /* Skip over Obsolete field in RTPI payload
341 * in Table 472 */
342 off += 2;
343 buf[off++] = ((port->sep_rtpi >> 8) & 0xff);
344 buf[off++] = (port->sep_rtpi & 0xff);
345 len += 8; /* Header size + Designation descriptor */
346 /*
347 * Target port group identifier, see spc4r17
348 * section 7.7.3.8
349 *
350 * Get the PROTOCOL IDENTIFIER as defined by spc4r17
351 * section 7.5.1 Table 362
352 */
353 check_tpgi:
354 if (dev->se_sub_dev->t10_alua.alua_type !=
355 SPC3_ALUA_EMULATED)
356 goto check_scsi_name;
357
358 if (((len + 4) + 8) > cmd->data_length) {
359 len += 8;
360 goto check_lu_gp;
361 }
362 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
363 if (!tg_pt_gp_mem)
364 goto check_lu_gp;
365
366 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
367 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
368 if (!tg_pt_gp) {
369 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
370 goto check_lu_gp;
371 }
372 tg_pt_gp_id = tg_pt_gp->tg_pt_gp_id;
373 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
374
375 buf[off] =
376 (tpg->se_tpg_tfo->get_fabric_proto_ident(tpg) << 4);
377 buf[off++] |= 0x1; /* CODE SET == Binary */
378 buf[off] = 0x80; /* Set PIV=1 */
379 /* Set ASSOCIATION == target port: 01b */
380 buf[off] |= 0x10;
381 /* DESIGNATOR TYPE == Target port group identifier */
382 buf[off++] |= 0x5;
383 off++; /* Skip over Reserved */
384 buf[off++] = 4; /* DESIGNATOR LENGTH */
385 off += 2; /* Skip over Reserved Field */
386 buf[off++] = ((tg_pt_gp_id >> 8) & 0xff);
387 buf[off++] = (tg_pt_gp_id & 0xff);
388 len += 8; /* Header size + Designation descriptor */
389 /*
390 * Logical Unit Group identifier, see spc4r17
391 * section 7.7.3.8
392 */
393 check_lu_gp:
394 if (((len + 4) + 8) > cmd->data_length) {
395 len += 8;
396 goto check_scsi_name;
397 }
398 lu_gp_mem = dev->dev_alua_lu_gp_mem;
399 if (!lu_gp_mem)
400 goto check_scsi_name;
401
402 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
403 lu_gp = lu_gp_mem->lu_gp;
404 if (!lu_gp) {
405 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
406 goto check_scsi_name;
407 }
408 lu_gp_id = lu_gp->lu_gp_id;
409 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
410
411 buf[off++] |= 0x1; /* CODE SET == Binary */
412 /* DESIGNATOR TYPE == Logical Unit Group identifier */
413 buf[off++] |= 0x6;
414 off++; /* Skip over Reserved */
415 buf[off++] = 4; /* DESIGNATOR LENGTH */
416 off += 2; /* Skip over Reserved Field */
417 buf[off++] = ((lu_gp_id >> 8) & 0xff);
418 buf[off++] = (lu_gp_id & 0xff);
419 len += 8; /* Header size + Designation descriptor */
420 /*
421 * SCSI name string designator, see spc4r17
422 * section 7.7.3.11
423 *
424 * Get the PROTOCOL IDENTIFIER as defined by spc4r17
425 * section 7.5.1 Table 362
426 */
427 check_scsi_name:
428 scsi_name_len = strlen(tpg->se_tpg_tfo->tpg_get_wwn(tpg));
429 /* UTF-8 ",t,0x<16-bit TPGT>" + NULL Terminator */
430 scsi_name_len += 10;
431 /* Check for 4-byte padding */
432 padding = ((-scsi_name_len) & 3);
433 if (padding != 0)
434 scsi_name_len += padding;
435 /* Header size + Designation descriptor */
436 scsi_name_len += 4;
437
438 if (((len + 4) + scsi_name_len) > cmd->data_length) {
439 len += scsi_name_len;
440 goto set_len;
441 }
442 buf[off] =
443 (tpg->se_tpg_tfo->get_fabric_proto_ident(tpg) << 4);
444 buf[off++] |= 0x3; /* CODE SET == UTF-8 */
445 buf[off] = 0x80; /* Set PIV=1 */
446 /* Set ASSOCIATION == target port: 01b */
447 buf[off] |= 0x10;
448 /* DESIGNATOR TYPE == SCSI name string */
449 buf[off++] |= 0x8;
450 off += 2; /* Skip over Reserved and length */
451 /*
452 * SCSI name string identifer containing, $FABRIC_MOD
453 * dependent information. For LIO-Target and iSCSI
454 * Target Port, this means "<iSCSI name>,t,0x<TPGT> in
455 * UTF-8 encoding.
456 */
457 tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg);
458 scsi_name_len = sprintf(&buf[off], "%s,t,0x%04x",
459 tpg->se_tpg_tfo->tpg_get_wwn(tpg), tpgt);
460 scsi_name_len += 1 /* Include NULL terminator */;
461 /*
462 * The null-terminated, null-padded (see 4.4.2) SCSI
463 * NAME STRING field contains a UTF-8 format string.
464 * The number of bytes in the SCSI NAME STRING field
465 * (i.e., the value in the DESIGNATOR LENGTH field)
466 * shall be no larger than 256 and shall be a multiple
467 * of four.
468 */
469 if (padding)
470 scsi_name_len += padding;
471
472 buf[off-1] = scsi_name_len;
473 off += scsi_name_len;
474 /* Header size + Designation descriptor */
475 len += (scsi_name_len + 4);
476 }
477 set_len:
478 buf[2] = ((len >> 8) & 0xff);
479 buf[3] = (len & 0xff); /* Page Length for VPD 0x83 */
480 return 0;
481 }
482
483 /* Extended INQUIRY Data VPD Page */
484 static int
target_emulate_evpd_86(struct se_cmd * cmd,unsigned char * buf)485 target_emulate_evpd_86(struct se_cmd *cmd, unsigned char *buf)
486 {
487 if (cmd->data_length < 60)
488 return 0;
489
490 buf[3] = 0x3c;
491 /* Set HEADSUP, ORDSUP, SIMPSUP */
492 buf[5] = 0x07;
493
494 /* If WriteCache emulation is enabled, set V_SUP */
495 if (cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_write_cache > 0)
496 buf[6] = 0x01;
497 return 0;
498 }
499
500 /* Block Limits VPD page */
501 static int
target_emulate_evpd_b0(struct se_cmd * cmd,unsigned char * buf)502 target_emulate_evpd_b0(struct se_cmd *cmd, unsigned char *buf)
503 {
504 struct se_device *dev = cmd->se_dev;
505 int have_tp = 0;
506
507 /*
508 * Following sbc3r22 section 6.5.3 Block Limits VPD page, when
509 * emulate_tpu=1 or emulate_tpws=1 we will be expect a
510 * different page length for Thin Provisioning.
511 */
512 if (dev->se_sub_dev->se_dev_attrib.emulate_tpu || dev->se_sub_dev->se_dev_attrib.emulate_tpws)
513 have_tp = 1;
514
515 if (cmd->data_length < (0x10 + 4)) {
516 pr_debug("Received data_length: %u"
517 " too small for EVPD 0xb0\n",
518 cmd->data_length);
519 return -EINVAL;
520 }
521
522 if (have_tp && cmd->data_length < (0x3c + 4)) {
523 pr_debug("Received data_length: %u"
524 " too small for TPE=1 EVPD 0xb0\n",
525 cmd->data_length);
526 have_tp = 0;
527 }
528
529 buf[0] = dev->transport->get_device_type(dev);
530 buf[3] = have_tp ? 0x3c : 0x10;
531
532 /* Set WSNZ to 1 */
533 buf[4] = 0x01;
534
535 /*
536 * Set OPTIMAL TRANSFER LENGTH GRANULARITY
537 */
538 put_unaligned_be16(1, &buf[6]);
539
540 /*
541 * Set MAXIMUM TRANSFER LENGTH
542 */
543 put_unaligned_be32(dev->se_sub_dev->se_dev_attrib.max_sectors, &buf[8]);
544
545 /*
546 * Set OPTIMAL TRANSFER LENGTH
547 */
548 put_unaligned_be32(dev->se_sub_dev->se_dev_attrib.optimal_sectors, &buf[12]);
549
550 /*
551 * Exit now if we don't support TP or the initiator sent a too
552 * short buffer.
553 */
554 if (!have_tp || cmd->data_length < (0x3c + 4))
555 return 0;
556
557 /*
558 * Set MAXIMUM UNMAP LBA COUNT
559 */
560 put_unaligned_be32(dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count, &buf[20]);
561
562 /*
563 * Set MAXIMUM UNMAP BLOCK DESCRIPTOR COUNT
564 */
565 put_unaligned_be32(dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count,
566 &buf[24]);
567
568 /*
569 * Set OPTIMAL UNMAP GRANULARITY
570 */
571 put_unaligned_be32(dev->se_sub_dev->se_dev_attrib.unmap_granularity, &buf[28]);
572
573 /*
574 * UNMAP GRANULARITY ALIGNMENT
575 */
576 put_unaligned_be32(dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment,
577 &buf[32]);
578 if (dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment != 0)
579 buf[32] |= 0x80; /* Set the UGAVALID bit */
580
581 return 0;
582 }
583
584 /* Block Device Characteristics VPD page */
585 static int
target_emulate_evpd_b1(struct se_cmd * cmd,unsigned char * buf)586 target_emulate_evpd_b1(struct se_cmd *cmd, unsigned char *buf)
587 {
588 struct se_device *dev = cmd->se_dev;
589
590 buf[0] = dev->transport->get_device_type(dev);
591 buf[3] = 0x3c;
592
593 if (cmd->data_length >= 5 &&
594 dev->se_sub_dev->se_dev_attrib.is_nonrot)
595 buf[5] = 1;
596
597 return 0;
598 }
599
600 /* Thin Provisioning VPD */
601 static int
target_emulate_evpd_b2(struct se_cmd * cmd,unsigned char * buf)602 target_emulate_evpd_b2(struct se_cmd *cmd, unsigned char *buf)
603 {
604 struct se_device *dev = cmd->se_dev;
605
606 /*
607 * From sbc3r22 section 6.5.4 Thin Provisioning VPD page:
608 *
609 * The PAGE LENGTH field is defined in SPC-4. If the DP bit is set to
610 * zero, then the page length shall be set to 0004h. If the DP bit
611 * is set to one, then the page length shall be set to the value
612 * defined in table 162.
613 */
614 buf[0] = dev->transport->get_device_type(dev);
615
616 /*
617 * Set Hardcoded length mentioned above for DP=0
618 */
619 put_unaligned_be16(0x0004, &buf[2]);
620
621 /*
622 * The THRESHOLD EXPONENT field indicates the threshold set size in
623 * LBAs as a power of 2 (i.e., the threshold set size is equal to
624 * 2(threshold exponent)).
625 *
626 * Note that this is currently set to 0x00 as mkp says it will be
627 * changing again. We can enable this once it has settled in T10
628 * and is actually used by Linux/SCSI ML code.
629 */
630 buf[4] = 0x00;
631
632 /*
633 * A TPU bit set to one indicates that the device server supports
634 * the UNMAP command (see 5.25). A TPU bit set to zero indicates
635 * that the device server does not support the UNMAP command.
636 */
637 if (dev->se_sub_dev->se_dev_attrib.emulate_tpu != 0)
638 buf[5] = 0x80;
639
640 /*
641 * A TPWS bit set to one indicates that the device server supports
642 * the use of the WRITE SAME (16) command (see 5.42) to unmap LBAs.
643 * A TPWS bit set to zero indicates that the device server does not
644 * support the use of the WRITE SAME (16) command to unmap LBAs.
645 */
646 if (dev->se_sub_dev->se_dev_attrib.emulate_tpws != 0)
647 buf[5] |= 0x40;
648
649 return 0;
650 }
651
652 static int
653 target_emulate_evpd_00(struct se_cmd *cmd, unsigned char *buf);
654
655 static struct {
656 uint8_t page;
657 int (*emulate)(struct se_cmd *, unsigned char *);
658 } evpd_handlers[] = {
659 { .page = 0x00, .emulate = target_emulate_evpd_00 },
660 { .page = 0x80, .emulate = target_emulate_evpd_80 },
661 { .page = 0x83, .emulate = target_emulate_evpd_83 },
662 { .page = 0x86, .emulate = target_emulate_evpd_86 },
663 { .page = 0xb0, .emulate = target_emulate_evpd_b0 },
664 { .page = 0xb1, .emulate = target_emulate_evpd_b1 },
665 { .page = 0xb2, .emulate = target_emulate_evpd_b2 },
666 };
667
668 /* supported vital product data pages */
669 static int
target_emulate_evpd_00(struct se_cmd * cmd,unsigned char * buf)670 target_emulate_evpd_00(struct se_cmd *cmd, unsigned char *buf)
671 {
672 int p;
673
674 if (cmd->data_length < 8)
675 return 0;
676 /*
677 * Only report the INQUIRY EVPD=1 pages after a valid NAA
678 * Registered Extended LUN WWN has been set via ConfigFS
679 * during device creation/restart.
680 */
681 if (cmd->se_dev->se_sub_dev->su_dev_flags &
682 SDF_EMULATED_VPD_UNIT_SERIAL) {
683 buf[3] = ARRAY_SIZE(evpd_handlers);
684 for (p = 0; p < min_t(int, ARRAY_SIZE(evpd_handlers),
685 cmd->data_length - 4); ++p)
686 buf[p + 4] = evpd_handlers[p].page;
687 }
688
689 return 0;
690 }
691
target_emulate_inquiry(struct se_task * task)692 int target_emulate_inquiry(struct se_task *task)
693 {
694 struct se_cmd *cmd = task->task_se_cmd;
695 struct se_device *dev = cmd->se_dev;
696 unsigned char *buf;
697 unsigned char *cdb = cmd->t_task_cdb;
698 int p, ret;
699
700 if (!(cdb[1] & 0x1)) {
701 if (cdb[2]) {
702 pr_err("INQUIRY with EVPD==0 but PAGE CODE=%02x\n",
703 cdb[2]);
704 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
705 return -EINVAL;
706 }
707
708 ret = target_emulate_inquiry_std(cmd);
709 goto out;
710 }
711
712 /*
713 * Make sure we at least have 4 bytes of INQUIRY response
714 * payload for 0x00 going back for EVPD=1. Note that 0x80
715 * and 0x83 will check for enough payload data length and
716 * jump to set_len: label when there is not enough inquiry EVPD
717 * payload length left for the next outgoing EVPD metadata
718 */
719 if (cmd->data_length < 4) {
720 pr_err("SCSI Inquiry payload length: %u"
721 " too small for EVPD=1\n", cmd->data_length);
722 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
723 return -EINVAL;
724 }
725
726 buf = transport_kmap_data_sg(cmd);
727
728 buf[0] = dev->transport->get_device_type(dev);
729
730 for (p = 0; p < ARRAY_SIZE(evpd_handlers); ++p) {
731 if (cdb[2] == evpd_handlers[p].page) {
732 buf[1] = cdb[2];
733 ret = evpd_handlers[p].emulate(cmd, buf);
734 goto out_unmap;
735 }
736 }
737
738 pr_err("Unknown VPD Code: 0x%02x\n", cdb[2]);
739 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
740 ret = -EINVAL;
741
742 out_unmap:
743 transport_kunmap_data_sg(cmd);
744 out:
745 if (!ret) {
746 task->task_scsi_status = GOOD;
747 transport_complete_task(task, 1);
748 }
749 return ret;
750 }
751
target_emulate_readcapacity(struct se_task * task)752 int target_emulate_readcapacity(struct se_task *task)
753 {
754 struct se_cmd *cmd = task->task_se_cmd;
755 struct se_device *dev = cmd->se_dev;
756 unsigned char *buf;
757 unsigned long long blocks_long = dev->transport->get_blocks(dev);
758 u32 blocks;
759
760 if (blocks_long >= 0x00000000ffffffff)
761 blocks = 0xffffffff;
762 else
763 blocks = (u32)blocks_long;
764
765 buf = transport_kmap_data_sg(cmd);
766
767 buf[0] = (blocks >> 24) & 0xff;
768 buf[1] = (blocks >> 16) & 0xff;
769 buf[2] = (blocks >> 8) & 0xff;
770 buf[3] = blocks & 0xff;
771 buf[4] = (dev->se_sub_dev->se_dev_attrib.block_size >> 24) & 0xff;
772 buf[5] = (dev->se_sub_dev->se_dev_attrib.block_size >> 16) & 0xff;
773 buf[6] = (dev->se_sub_dev->se_dev_attrib.block_size >> 8) & 0xff;
774 buf[7] = dev->se_sub_dev->se_dev_attrib.block_size & 0xff;
775 /*
776 * Set max 32-bit blocks to signal SERVICE ACTION READ_CAPACITY_16
777 */
778 if (dev->se_sub_dev->se_dev_attrib.emulate_tpu || dev->se_sub_dev->se_dev_attrib.emulate_tpws)
779 put_unaligned_be32(0xFFFFFFFF, &buf[0]);
780
781 transport_kunmap_data_sg(cmd);
782
783 task->task_scsi_status = GOOD;
784 transport_complete_task(task, 1);
785 return 0;
786 }
787
target_emulate_readcapacity_16(struct se_task * task)788 int target_emulate_readcapacity_16(struct se_task *task)
789 {
790 struct se_cmd *cmd = task->task_se_cmd;
791 struct se_device *dev = cmd->se_dev;
792 unsigned char *buf;
793 unsigned long long blocks = dev->transport->get_blocks(dev);
794
795 buf = transport_kmap_data_sg(cmd);
796
797 buf[0] = (blocks >> 56) & 0xff;
798 buf[1] = (blocks >> 48) & 0xff;
799 buf[2] = (blocks >> 40) & 0xff;
800 buf[3] = (blocks >> 32) & 0xff;
801 buf[4] = (blocks >> 24) & 0xff;
802 buf[5] = (blocks >> 16) & 0xff;
803 buf[6] = (blocks >> 8) & 0xff;
804 buf[7] = blocks & 0xff;
805 buf[8] = (dev->se_sub_dev->se_dev_attrib.block_size >> 24) & 0xff;
806 buf[9] = (dev->se_sub_dev->se_dev_attrib.block_size >> 16) & 0xff;
807 buf[10] = (dev->se_sub_dev->se_dev_attrib.block_size >> 8) & 0xff;
808 buf[11] = dev->se_sub_dev->se_dev_attrib.block_size & 0xff;
809 /*
810 * Set Thin Provisioning Enable bit following sbc3r22 in section
811 * READ CAPACITY (16) byte 14 if emulate_tpu or emulate_tpws is enabled.
812 */
813 if (dev->se_sub_dev->se_dev_attrib.emulate_tpu || dev->se_sub_dev->se_dev_attrib.emulate_tpws)
814 buf[14] = 0x80;
815
816 transport_kunmap_data_sg(cmd);
817
818 task->task_scsi_status = GOOD;
819 transport_complete_task(task, 1);
820 return 0;
821 }
822
823 static int
target_modesense_rwrecovery(unsigned char * p)824 target_modesense_rwrecovery(unsigned char *p)
825 {
826 p[0] = 0x01;
827 p[1] = 0x0a;
828
829 return 12;
830 }
831
832 static int
target_modesense_control(struct se_device * dev,unsigned char * p)833 target_modesense_control(struct se_device *dev, unsigned char *p)
834 {
835 p[0] = 0x0a;
836 p[1] = 0x0a;
837 p[2] = 2;
838 /*
839 * From spc4r23, 7.4.7 Control mode page
840 *
841 * The QUEUE ALGORITHM MODIFIER field (see table 368) specifies
842 * restrictions on the algorithm used for reordering commands
843 * having the SIMPLE task attribute (see SAM-4).
844 *
845 * Table 368 -- QUEUE ALGORITHM MODIFIER field
846 * Code Description
847 * 0h Restricted reordering
848 * 1h Unrestricted reordering allowed
849 * 2h to 7h Reserved
850 * 8h to Fh Vendor specific
851 *
852 * A value of zero in the QUEUE ALGORITHM MODIFIER field specifies that
853 * the device server shall order the processing sequence of commands
854 * having the SIMPLE task attribute such that data integrity is maintained
855 * for that I_T nexus (i.e., if the transmission of new SCSI transport protocol
856 * requests is halted at any time, the final value of all data observable
857 * on the medium shall be the same as if all the commands had been processed
858 * with the ORDERED task attribute).
859 *
860 * A value of one in the QUEUE ALGORITHM MODIFIER field specifies that the
861 * device server may reorder the processing sequence of commands having the
862 * SIMPLE task attribute in any manner. Any data integrity exposures related to
863 * command sequence order shall be explicitly handled by the application client
864 * through the selection of appropriate ommands and task attributes.
865 */
866 p[3] = (dev->se_sub_dev->se_dev_attrib.emulate_rest_reord == 1) ? 0x00 : 0x10;
867 /*
868 * From spc4r17, section 7.4.6 Control mode Page
869 *
870 * Unit Attention interlocks control (UN_INTLCK_CTRL) to code 00b
871 *
872 * 00b: The logical unit shall clear any unit attention condition
873 * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION
874 * status and shall not establish a unit attention condition when a com-
875 * mand is completed with BUSY, TASK SET FULL, or RESERVATION CONFLICT
876 * status.
877 *
878 * 10b: The logical unit shall not clear any unit attention condition
879 * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION
880 * status and shall not establish a unit attention condition when
881 * a command is completed with BUSY, TASK SET FULL, or RESERVATION
882 * CONFLICT status.
883 *
884 * 11b a The logical unit shall not clear any unit attention condition
885 * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION
886 * status and shall establish a unit attention condition for the
887 * initiator port associated with the I_T nexus on which the BUSY,
888 * TASK SET FULL, or RESERVATION CONFLICT status is being returned.
889 * Depending on the status, the additional sense code shall be set to
890 * PREVIOUS BUSY STATUS, PREVIOUS TASK SET FULL STATUS, or PREVIOUS
891 * RESERVATION CONFLICT STATUS. Until it is cleared by a REQUEST SENSE
892 * command, a unit attention condition shall be established only once
893 * for a BUSY, TASK SET FULL, or RESERVATION CONFLICT status regardless
894 * to the number of commands completed with one of those status codes.
895 */
896 p[4] = (dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2) ? 0x30 :
897 (dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 1) ? 0x20 : 0x00;
898 /*
899 * From spc4r17, section 7.4.6 Control mode Page
900 *
901 * Task Aborted Status (TAS) bit set to zero.
902 *
903 * A task aborted status (TAS) bit set to zero specifies that aborted
904 * tasks shall be terminated by the device server without any response
905 * to the application client. A TAS bit set to one specifies that tasks
906 * aborted by the actions of an I_T nexus other than the I_T nexus on
907 * which the command was received shall be completed with TASK ABORTED
908 * status (see SAM-4).
909 */
910 p[5] = (dev->se_sub_dev->se_dev_attrib.emulate_tas) ? 0x40 : 0x00;
911 p[8] = 0xff;
912 p[9] = 0xff;
913 p[11] = 30;
914
915 return 12;
916 }
917
918 static int
target_modesense_caching(struct se_device * dev,unsigned char * p)919 target_modesense_caching(struct se_device *dev, unsigned char *p)
920 {
921 p[0] = 0x08;
922 p[1] = 0x12;
923 if (dev->se_sub_dev->se_dev_attrib.emulate_write_cache > 0)
924 p[2] = 0x04; /* Write Cache Enable */
925 p[12] = 0x20; /* Disabled Read Ahead */
926
927 return 20;
928 }
929
930 static void
target_modesense_write_protect(unsigned char * buf,int type)931 target_modesense_write_protect(unsigned char *buf, int type)
932 {
933 /*
934 * I believe that the WP bit (bit 7) in the mode header is the same for
935 * all device types..
936 */
937 switch (type) {
938 case TYPE_DISK:
939 case TYPE_TAPE:
940 default:
941 buf[0] |= 0x80; /* WP bit */
942 break;
943 }
944 }
945
946 static void
target_modesense_dpofua(unsigned char * buf,int type)947 target_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
target_emulate_modesense(struct se_task * task)958 int target_emulate_modesense(struct se_task *task)
959 {
960 struct se_cmd *cmd = task->task_se_cmd;
961 struct se_device *dev = cmd->se_dev;
962 char *cdb = cmd->t_task_cdb;
963 unsigned char *rbuf;
964 int type = dev->transport->get_device_type(dev);
965 int ten = (cmd->t_task_cdb[0] == MODE_SENSE_10);
966 int offset = ten ? 8 : 4;
967 int length = 0;
968 unsigned char buf[SE_MODE_PAGE_BUF];
969
970 memset(buf, 0, SE_MODE_PAGE_BUF);
971
972 switch (cdb[2] & 0x3f) {
973 case 0x01:
974 length = target_modesense_rwrecovery(&buf[offset]);
975 break;
976 case 0x08:
977 length = target_modesense_caching(dev, &buf[offset]);
978 break;
979 case 0x0a:
980 length = target_modesense_control(dev, &buf[offset]);
981 break;
982 case 0x3f:
983 length = target_modesense_rwrecovery(&buf[offset]);
984 length += target_modesense_caching(dev, &buf[offset+length]);
985 length += target_modesense_control(dev, &buf[offset+length]);
986 break;
987 default:
988 pr_err("MODE SENSE: unimplemented page/subpage: 0x%02x/0x%02x\n",
989 cdb[2] & 0x3f, cdb[3]);
990 cmd->scsi_sense_reason = TCM_UNKNOWN_MODE_PAGE;
991 return -EINVAL;
992 }
993 offset += length;
994
995 if (ten) {
996 offset -= 2;
997 buf[0] = (offset >> 8) & 0xff;
998 buf[1] = offset & 0xff;
999
1000 if ((cmd->se_lun->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY) ||
1001 (cmd->se_deve &&
1002 (cmd->se_deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY)))
1003 target_modesense_write_protect(&buf[3], type);
1004
1005 if ((dev->se_sub_dev->se_dev_attrib.emulate_write_cache > 0) &&
1006 (dev->se_sub_dev->se_dev_attrib.emulate_fua_write > 0))
1007 target_modesense_dpofua(&buf[3], type);
1008
1009 if ((offset + 2) > cmd->data_length)
1010 offset = cmd->data_length;
1011
1012 } else {
1013 offset -= 1;
1014 buf[0] = offset & 0xff;
1015
1016 if ((cmd->se_lun->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY) ||
1017 (cmd->se_deve &&
1018 (cmd->se_deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY)))
1019 target_modesense_write_protect(&buf[2], type);
1020
1021 if ((dev->se_sub_dev->se_dev_attrib.emulate_write_cache > 0) &&
1022 (dev->se_sub_dev->se_dev_attrib.emulate_fua_write > 0))
1023 target_modesense_dpofua(&buf[2], type);
1024
1025 if ((offset + 1) > cmd->data_length)
1026 offset = cmd->data_length;
1027 }
1028
1029 rbuf = transport_kmap_data_sg(cmd);
1030 memcpy(rbuf, buf, offset);
1031 transport_kunmap_data_sg(cmd);
1032
1033 task->task_scsi_status = GOOD;
1034 transport_complete_task(task, 1);
1035 return 0;
1036 }
1037
target_emulate_request_sense(struct se_task * task)1038 int target_emulate_request_sense(struct se_task *task)
1039 {
1040 struct se_cmd *cmd = task->task_se_cmd;
1041 unsigned char *cdb = cmd->t_task_cdb;
1042 unsigned char *buf;
1043 u8 ua_asc = 0, ua_ascq = 0;
1044 int err = 0;
1045
1046 if (cdb[1] & 0x01) {
1047 pr_err("REQUEST_SENSE description emulation not"
1048 " supported\n");
1049 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1050 return -ENOSYS;
1051 }
1052
1053 buf = transport_kmap_data_sg(cmd);
1054
1055 if (!core_scsi3_ua_clear_for_request_sense(cmd, &ua_asc, &ua_ascq)) {
1056 /*
1057 * CURRENT ERROR, UNIT ATTENTION
1058 */
1059 buf[0] = 0x70;
1060 buf[SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
1061
1062 if (cmd->data_length < 18) {
1063 buf[7] = 0x00;
1064 err = -EINVAL;
1065 goto end;
1066 }
1067 /*
1068 * The Additional Sense Code (ASC) from the UNIT ATTENTION
1069 */
1070 buf[SPC_ASC_KEY_OFFSET] = ua_asc;
1071 buf[SPC_ASCQ_KEY_OFFSET] = ua_ascq;
1072 buf[7] = 0x0A;
1073 } else {
1074 /*
1075 * CURRENT ERROR, NO SENSE
1076 */
1077 buf[0] = 0x70;
1078 buf[SPC_SENSE_KEY_OFFSET] = NO_SENSE;
1079
1080 if (cmd->data_length < 18) {
1081 buf[7] = 0x00;
1082 err = -EINVAL;
1083 goto end;
1084 }
1085 /*
1086 * NO ADDITIONAL SENSE INFORMATION
1087 */
1088 buf[SPC_ASC_KEY_OFFSET] = 0x00;
1089 buf[7] = 0x0A;
1090 }
1091
1092 end:
1093 transport_kunmap_data_sg(cmd);
1094 task->task_scsi_status = GOOD;
1095 transport_complete_task(task, 1);
1096 return 0;
1097 }
1098
1099 /*
1100 * Used for TCM/IBLOCK and TCM/FILEIO for block/blk-lib.c level discard support.
1101 * Note this is not used for TCM/pSCSI passthrough
1102 */
target_emulate_unmap(struct se_task * task)1103 int target_emulate_unmap(struct se_task *task)
1104 {
1105 struct se_cmd *cmd = task->task_se_cmd;
1106 struct se_device *dev = cmd->se_dev;
1107 unsigned char *buf, *ptr = NULL;
1108 unsigned char *cdb = &cmd->t_task_cdb[0];
1109 sector_t lba;
1110 unsigned int size = cmd->data_length, range;
1111 int ret = 0, offset;
1112 unsigned short dl, bd_dl;
1113
1114 if (!dev->transport->do_discard) {
1115 pr_err("UNMAP emulation not supported for: %s\n",
1116 dev->transport->name);
1117 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1118 return -ENOSYS;
1119 }
1120
1121 /* First UNMAP block descriptor starts at 8 byte offset */
1122 offset = 8;
1123 size -= 8;
1124 dl = get_unaligned_be16(&cdb[0]);
1125 bd_dl = get_unaligned_be16(&cdb[2]);
1126
1127 buf = transport_kmap_data_sg(cmd);
1128
1129 ptr = &buf[offset];
1130 pr_debug("UNMAP: Sub: %s Using dl: %hu bd_dl: %hu size: %hu"
1131 " ptr: %p\n", dev->transport->name, dl, bd_dl, size, ptr);
1132
1133 while (size) {
1134 lba = get_unaligned_be64(&ptr[0]);
1135 range = get_unaligned_be32(&ptr[8]);
1136 pr_debug("UNMAP: Using lba: %llu and range: %u\n",
1137 (unsigned long long)lba, range);
1138
1139 ret = dev->transport->do_discard(dev, lba, range);
1140 if (ret < 0) {
1141 pr_err("blkdev_issue_discard() failed: %d\n",
1142 ret);
1143 goto err;
1144 }
1145
1146 ptr += 16;
1147 size -= 16;
1148 }
1149
1150 err:
1151 transport_kunmap_data_sg(cmd);
1152 if (!ret) {
1153 task->task_scsi_status = GOOD;
1154 transport_complete_task(task, 1);
1155 }
1156 return ret;
1157 }
1158
1159 /*
1160 * Used for TCM/IBLOCK and TCM/FILEIO for block/blk-lib.c level discard support.
1161 * Note this is not used for TCM/pSCSI passthrough
1162 */
target_emulate_write_same(struct se_task * task)1163 int target_emulate_write_same(struct se_task *task)
1164 {
1165 struct se_cmd *cmd = task->task_se_cmd;
1166 struct se_device *dev = cmd->se_dev;
1167 sector_t range;
1168 sector_t lba = cmd->t_task_lba;
1169 u32 num_blocks;
1170 int ret;
1171
1172 if (!dev->transport->do_discard) {
1173 pr_err("WRITE_SAME emulation not supported"
1174 " for: %s\n", dev->transport->name);
1175 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1176 return -ENOSYS;
1177 }
1178
1179 if (cmd->t_task_cdb[0] == WRITE_SAME)
1180 num_blocks = get_unaligned_be16(&cmd->t_task_cdb[7]);
1181 else if (cmd->t_task_cdb[0] == WRITE_SAME_16)
1182 num_blocks = get_unaligned_be32(&cmd->t_task_cdb[10]);
1183 else /* WRITE_SAME_32 via VARIABLE_LENGTH_CMD */
1184 num_blocks = get_unaligned_be32(&cmd->t_task_cdb[28]);
1185
1186 /*
1187 * Use the explicit range when non zero is supplied, otherwise calculate
1188 * the remaining range based on ->get_blocks() - starting LBA.
1189 */
1190 if (num_blocks != 0)
1191 range = num_blocks;
1192 else
1193 range = (dev->transport->get_blocks(dev) - lba);
1194
1195 pr_debug("WRITE_SAME UNMAP: LBA: %llu Range: %llu\n",
1196 (unsigned long long)lba, (unsigned long long)range);
1197
1198 ret = dev->transport->do_discard(dev, lba, range);
1199 if (ret < 0) {
1200 pr_debug("blkdev_issue_discard() failed for WRITE_SAME\n");
1201 return ret;
1202 }
1203
1204 task->task_scsi_status = GOOD;
1205 transport_complete_task(task, 1);
1206 return 0;
1207 }
1208
target_emulate_synchronize_cache(struct se_task * task)1209 int target_emulate_synchronize_cache(struct se_task *task)
1210 {
1211 struct se_device *dev = task->task_se_cmd->se_dev;
1212 struct se_cmd *cmd = task->task_se_cmd;
1213
1214 if (!dev->transport->do_sync_cache) {
1215 pr_err("SYNCHRONIZE_CACHE emulation not supported"
1216 " for: %s\n", dev->transport->name);
1217 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1218 return -ENOSYS;
1219 }
1220
1221 dev->transport->do_sync_cache(task);
1222 return 0;
1223 }
1224
target_emulate_noop(struct se_task * task)1225 int target_emulate_noop(struct se_task *task)
1226 {
1227 task->task_scsi_status = GOOD;
1228 transport_complete_task(task, 1);
1229 return 0;
1230 }
1231
1232 /*
1233 * Write a CDB into @cdb that is based on the one the intiator sent us,
1234 * but updated to only cover the sectors that the current task handles.
1235 */
target_get_task_cdb(struct se_task * task,unsigned char * cdb)1236 void target_get_task_cdb(struct se_task *task, unsigned char *cdb)
1237 {
1238 struct se_cmd *cmd = task->task_se_cmd;
1239 unsigned int cdb_len = scsi_command_size(cmd->t_task_cdb);
1240
1241 memcpy(cdb, cmd->t_task_cdb, cdb_len);
1242 if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) {
1243 unsigned long long lba = task->task_lba;
1244 u32 sectors = task->task_sectors;
1245
1246 switch (cdb_len) {
1247 case 6:
1248 /* 21-bit LBA and 8-bit sectors */
1249 cdb[1] = (lba >> 16) & 0x1f;
1250 cdb[2] = (lba >> 8) & 0xff;
1251 cdb[3] = lba & 0xff;
1252 cdb[4] = sectors & 0xff;
1253 break;
1254 case 10:
1255 /* 32-bit LBA and 16-bit sectors */
1256 put_unaligned_be32(lba, &cdb[2]);
1257 put_unaligned_be16(sectors, &cdb[7]);
1258 break;
1259 case 12:
1260 /* 32-bit LBA and 32-bit sectors */
1261 put_unaligned_be32(lba, &cdb[2]);
1262 put_unaligned_be32(sectors, &cdb[6]);
1263 break;
1264 case 16:
1265 /* 64-bit LBA and 32-bit sectors */
1266 put_unaligned_be64(lba, &cdb[2]);
1267 put_unaligned_be32(sectors, &cdb[10]);
1268 break;
1269 case 32:
1270 /* 64-bit LBA and 32-bit sectors, extended CDB */
1271 put_unaligned_be64(lba, &cdb[12]);
1272 put_unaligned_be32(sectors, &cdb[28]);
1273 break;
1274 default:
1275 BUG();
1276 }
1277 }
1278 }
1279 EXPORT_SYMBOL(target_get_task_cdb);
1280