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target: remove SCF_EMULATE_CDB_ASYNC
[deliverable/linux.git] / drivers / target / target_core_cdb.c
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_transport.h>
33 #include <target/target_core_fabric_ops.h>
34 #include "target_core_ua.h"
35
36 static void
37 target_fill_alua_data(struct se_port *port, unsigned char *buf)
38 {
39 struct t10_alua_tg_pt_gp *tg_pt_gp;
40 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
41
42 /*
43 * Set SCCS for MAINTENANCE_IN + REPORT_TARGET_PORT_GROUPS.
44 */
45 buf[5] = 0x80;
46
47 /*
48 * Set TPGS field for explict and/or implict ALUA access type
49 * and opteration.
50 *
51 * See spc4r17 section 6.4.2 Table 135
52 */
53 if (!port)
54 return;
55 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
56 if (!tg_pt_gp_mem)
57 return;
58
59 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
60 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
61 if (tg_pt_gp)
62 buf[5] |= tg_pt_gp->tg_pt_gp_alua_access_type;
63 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
64 }
65
66 static int
67 target_emulate_inquiry_std(struct se_cmd *cmd)
68 {
69 struct se_lun *lun = cmd->se_lun;
70 struct se_device *dev = cmd->se_dev;
71 struct se_portal_group *tpg = lun->lun_sep->sep_tpg;
72 unsigned char *buf;
73
74 /*
75 * Make sure we at least have 6 bytes of INQUIRY response
76 * payload going back for EVPD=0
77 */
78 if (cmd->data_length < 6) {
79 pr_err("SCSI Inquiry payload length: %u"
80 " too small for EVPD=0\n", cmd->data_length);
81 return -EINVAL;
82 }
83
84 buf = transport_kmap_first_data_page(cmd);
85
86 if (dev == tpg->tpg_virt_lun0.lun_se_dev) {
87 buf[0] = 0x3f; /* Not connected */
88 } else {
89 buf[0] = dev->transport->get_device_type(dev);
90 if (buf[0] == TYPE_TAPE)
91 buf[1] = 0x80;
92 }
93 buf[2] = dev->transport->get_device_rev(dev);
94
95 /*
96 * Enable SCCS and TPGS fields for Emulated ALUA
97 */
98 if (dev->se_sub_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED)
99 target_fill_alua_data(lun->lun_sep, buf);
100
101 if (cmd->data_length < 8) {
102 buf[4] = 1; /* Set additional length to 1 */
103 goto out;
104 }
105
106 buf[7] = 0x32; /* Sync=1 and CmdQue=1 */
107
108 /*
109 * Do not include vendor, product, reversion info in INQUIRY
110 * response payload for cdbs with a small allocation length.
111 */
112 if (cmd->data_length < 36) {
113 buf[4] = 3; /* Set additional length to 3 */
114 goto out;
115 }
116
117 snprintf((unsigned char *)&buf[8], 8, "LIO-ORG");
118 snprintf((unsigned char *)&buf[16], 16, "%s",
119 &dev->se_sub_dev->t10_wwn.model[0]);
120 snprintf((unsigned char *)&buf[32], 4, "%s",
121 &dev->se_sub_dev->t10_wwn.revision[0]);
122 buf[4] = 31; /* Set additional length to 31 */
123
124 out:
125 transport_kunmap_first_data_page(cmd);
126 return 0;
127 }
128
129 /* unit serial number */
130 static int
131 target_emulate_evpd_80(struct se_cmd *cmd, unsigned char *buf)
132 {
133 struct se_device *dev = cmd->se_dev;
134 u16 len = 0;
135
136 if (dev->se_sub_dev->su_dev_flags &
137 SDF_EMULATED_VPD_UNIT_SERIAL) {
138 u32 unit_serial_len;
139
140 unit_serial_len =
141 strlen(&dev->se_sub_dev->t10_wwn.unit_serial[0]);
142 unit_serial_len++; /* For NULL Terminator */
143
144 if (((len + 4) + unit_serial_len) > cmd->data_length) {
145 len += unit_serial_len;
146 buf[2] = ((len >> 8) & 0xff);
147 buf[3] = (len & 0xff);
148 return 0;
149 }
150 len += sprintf((unsigned char *)&buf[4], "%s",
151 &dev->se_sub_dev->t10_wwn.unit_serial[0]);
152 len++; /* Extra Byte for NULL Terminator */
153 buf[3] = len;
154 }
155 return 0;
156 }
157
158 static void
159 target_parse_naa_6h_vendor_specific(struct se_device *dev, unsigned char *buf)
160 {
161 unsigned char *p = &dev->se_sub_dev->t10_wwn.unit_serial[0];
162 int cnt;
163 bool next = true;
164
165 /*
166 * Generate up to 36 bits of VENDOR SPECIFIC IDENTIFIER starting on
167 * byte 3 bit 3-0 for NAA IEEE Registered Extended DESIGNATOR field
168 * format, followed by 64 bits of VENDOR SPECIFIC IDENTIFIER EXTENSION
169 * to complete the payload. These are based from VPD=0x80 PRODUCT SERIAL
170 * NUMBER set via vpd_unit_serial in target_core_configfs.c to ensure
171 * per device uniqeness.
172 */
173 for (cnt = 0; *p && cnt < 13; p++) {
174 int val = hex_to_bin(*p);
175
176 if (val < 0)
177 continue;
178
179 if (next) {
180 next = false;
181 buf[cnt++] |= val;
182 } else {
183 next = true;
184 buf[cnt] = val << 4;
185 }
186 }
187 }
188
189 /*
190 * Device identification VPD, for a complete list of
191 * DESIGNATOR TYPEs see spc4r17 Table 459.
192 */
193 static int
194 target_emulate_evpd_83(struct se_cmd *cmd, unsigned char *buf)
195 {
196 struct se_device *dev = cmd->se_dev;
197 struct se_lun *lun = cmd->se_lun;
198 struct se_port *port = NULL;
199 struct se_portal_group *tpg = NULL;
200 struct t10_alua_lu_gp_member *lu_gp_mem;
201 struct t10_alua_tg_pt_gp *tg_pt_gp;
202 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
203 unsigned char *prod = &dev->se_sub_dev->t10_wwn.model[0];
204 u32 prod_len;
205 u32 unit_serial_len, off = 0;
206 u16 len = 0, id_len;
207
208 off = 4;
209
210 /*
211 * NAA IEEE Registered Extended Assigned designator format, see
212 * spc4r17 section 7.7.3.6.5
213 *
214 * We depend upon a target_core_mod/ConfigFS provided
215 * /sys/kernel/config/target/core/$HBA/$DEV/wwn/vpd_unit_serial
216 * value in order to return the NAA id.
217 */
218 if (!(dev->se_sub_dev->su_dev_flags & SDF_EMULATED_VPD_UNIT_SERIAL))
219 goto check_t10_vend_desc;
220
221 if (off + 20 > cmd->data_length)
222 goto check_t10_vend_desc;
223
224 /* CODE SET == Binary */
225 buf[off++] = 0x1;
226
227 /* Set ASSOCIATION == addressed logical unit: 0)b */
228 buf[off] = 0x00;
229
230 /* Identifier/Designator type == NAA identifier */
231 buf[off++] |= 0x3;
232 off++;
233
234 /* Identifier/Designator length */
235 buf[off++] = 0x10;
236
237 /*
238 * Start NAA IEEE Registered Extended Identifier/Designator
239 */
240 buf[off++] = (0x6 << 4);
241
242 /*
243 * Use OpenFabrics IEEE Company ID: 00 14 05
244 */
245 buf[off++] = 0x01;
246 buf[off++] = 0x40;
247 buf[off] = (0x5 << 4);
248
249 /*
250 * Return ConfigFS Unit Serial Number information for
251 * VENDOR_SPECIFIC_IDENTIFIER and
252 * VENDOR_SPECIFIC_IDENTIFIER_EXTENTION
253 */
254 target_parse_naa_6h_vendor_specific(dev, &buf[off]);
255
256 len = 20;
257 off = (len + 4);
258
259 check_t10_vend_desc:
260 /*
261 * T10 Vendor Identifier Page, see spc4r17 section 7.7.3.4
262 */
263 id_len = 8; /* For Vendor field */
264 prod_len = 4; /* For VPD Header */
265 prod_len += 8; /* For Vendor field */
266 prod_len += strlen(prod);
267 prod_len++; /* For : */
268
269 if (dev->se_sub_dev->su_dev_flags &
270 SDF_EMULATED_VPD_UNIT_SERIAL) {
271 unit_serial_len =
272 strlen(&dev->se_sub_dev->t10_wwn.unit_serial[0]);
273 unit_serial_len++; /* For NULL Terminator */
274
275 if ((len + (id_len + 4) +
276 (prod_len + unit_serial_len)) >
277 cmd->data_length) {
278 len += (prod_len + unit_serial_len);
279 goto check_port;
280 }
281 id_len += sprintf((unsigned char *)&buf[off+12],
282 "%s:%s", prod,
283 &dev->se_sub_dev->t10_wwn.unit_serial[0]);
284 }
285 buf[off] = 0x2; /* ASCII */
286 buf[off+1] = 0x1; /* T10 Vendor ID */
287 buf[off+2] = 0x0;
288 memcpy((unsigned char *)&buf[off+4], "LIO-ORG", 8);
289 /* Extra Byte for NULL Terminator */
290 id_len++;
291 /* Identifier Length */
292 buf[off+3] = id_len;
293 /* Header size for Designation descriptor */
294 len += (id_len + 4);
295 off += (id_len + 4);
296 /*
297 * struct se_port is only set for INQUIRY VPD=1 through $FABRIC_MOD
298 */
299 check_port:
300 port = lun->lun_sep;
301 if (port) {
302 struct t10_alua_lu_gp *lu_gp;
303 u32 padding, scsi_name_len;
304 u16 lu_gp_id = 0;
305 u16 tg_pt_gp_id = 0;
306 u16 tpgt;
307
308 tpg = port->sep_tpg;
309 /*
310 * Relative target port identifer, see spc4r17
311 * section 7.7.3.7
312 *
313 * Get the PROTOCOL IDENTIFIER as defined by spc4r17
314 * section 7.5.1 Table 362
315 */
316 if (((len + 4) + 8) > cmd->data_length) {
317 len += 8;
318 goto check_tpgi;
319 }
320 buf[off] =
321 (tpg->se_tpg_tfo->get_fabric_proto_ident(tpg) << 4);
322 buf[off++] |= 0x1; /* CODE SET == Binary */
323 buf[off] = 0x80; /* Set PIV=1 */
324 /* Set ASSOCIATION == target port: 01b */
325 buf[off] |= 0x10;
326 /* DESIGNATOR TYPE == Relative target port identifer */
327 buf[off++] |= 0x4;
328 off++; /* Skip over Reserved */
329 buf[off++] = 4; /* DESIGNATOR LENGTH */
330 /* Skip over Obsolete field in RTPI payload
331 * in Table 472 */
332 off += 2;
333 buf[off++] = ((port->sep_rtpi >> 8) & 0xff);
334 buf[off++] = (port->sep_rtpi & 0xff);
335 len += 8; /* Header size + Designation descriptor */
336 /*
337 * Target port group identifier, see spc4r17
338 * section 7.7.3.8
339 *
340 * Get the PROTOCOL IDENTIFIER as defined by spc4r17
341 * section 7.5.1 Table 362
342 */
343 check_tpgi:
344 if (dev->se_sub_dev->t10_alua.alua_type !=
345 SPC3_ALUA_EMULATED)
346 goto check_scsi_name;
347
348 if (((len + 4) + 8) > cmd->data_length) {
349 len += 8;
350 goto check_lu_gp;
351 }
352 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
353 if (!tg_pt_gp_mem)
354 goto check_lu_gp;
355
356 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
357 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
358 if (!tg_pt_gp) {
359 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
360 goto check_lu_gp;
361 }
362 tg_pt_gp_id = tg_pt_gp->tg_pt_gp_id;
363 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
364
365 buf[off] =
366 (tpg->se_tpg_tfo->get_fabric_proto_ident(tpg) << 4);
367 buf[off++] |= 0x1; /* CODE SET == Binary */
368 buf[off] = 0x80; /* Set PIV=1 */
369 /* Set ASSOCIATION == target port: 01b */
370 buf[off] |= 0x10;
371 /* DESIGNATOR TYPE == Target port group identifier */
372 buf[off++] |= 0x5;
373 off++; /* Skip over Reserved */
374 buf[off++] = 4; /* DESIGNATOR LENGTH */
375 off += 2; /* Skip over Reserved Field */
376 buf[off++] = ((tg_pt_gp_id >> 8) & 0xff);
377 buf[off++] = (tg_pt_gp_id & 0xff);
378 len += 8; /* Header size + Designation descriptor */
379 /*
380 * Logical Unit Group identifier, see spc4r17
381 * section 7.7.3.8
382 */
383 check_lu_gp:
384 if (((len + 4) + 8) > cmd->data_length) {
385 len += 8;
386 goto check_scsi_name;
387 }
388 lu_gp_mem = dev->dev_alua_lu_gp_mem;
389 if (!lu_gp_mem)
390 goto check_scsi_name;
391
392 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
393 lu_gp = lu_gp_mem->lu_gp;
394 if (!lu_gp) {
395 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
396 goto check_scsi_name;
397 }
398 lu_gp_id = lu_gp->lu_gp_id;
399 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
400
401 buf[off++] |= 0x1; /* CODE SET == Binary */
402 /* DESIGNATOR TYPE == Logical Unit Group identifier */
403 buf[off++] |= 0x6;
404 off++; /* Skip over Reserved */
405 buf[off++] = 4; /* DESIGNATOR LENGTH */
406 off += 2; /* Skip over Reserved Field */
407 buf[off++] = ((lu_gp_id >> 8) & 0xff);
408 buf[off++] = (lu_gp_id & 0xff);
409 len += 8; /* Header size + Designation descriptor */
410 /*
411 * SCSI name string designator, see spc4r17
412 * section 7.7.3.11
413 *
414 * Get the PROTOCOL IDENTIFIER as defined by spc4r17
415 * section 7.5.1 Table 362
416 */
417 check_scsi_name:
418 scsi_name_len = strlen(tpg->se_tpg_tfo->tpg_get_wwn(tpg));
419 /* UTF-8 ",t,0x<16-bit TPGT>" + NULL Terminator */
420 scsi_name_len += 10;
421 /* Check for 4-byte padding */
422 padding = ((-scsi_name_len) & 3);
423 if (padding != 0)
424 scsi_name_len += padding;
425 /* Header size + Designation descriptor */
426 scsi_name_len += 4;
427
428 if (((len + 4) + scsi_name_len) > cmd->data_length) {
429 len += scsi_name_len;
430 goto set_len;
431 }
432 buf[off] =
433 (tpg->se_tpg_tfo->get_fabric_proto_ident(tpg) << 4);
434 buf[off++] |= 0x3; /* CODE SET == UTF-8 */
435 buf[off] = 0x80; /* Set PIV=1 */
436 /* Set ASSOCIATION == target port: 01b */
437 buf[off] |= 0x10;
438 /* DESIGNATOR TYPE == SCSI name string */
439 buf[off++] |= 0x8;
440 off += 2; /* Skip over Reserved and length */
441 /*
442 * SCSI name string identifer containing, $FABRIC_MOD
443 * dependent information. For LIO-Target and iSCSI
444 * Target Port, this means "<iSCSI name>,t,0x<TPGT> in
445 * UTF-8 encoding.
446 */
447 tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg);
448 scsi_name_len = sprintf(&buf[off], "%s,t,0x%04x",
449 tpg->se_tpg_tfo->tpg_get_wwn(tpg), tpgt);
450 scsi_name_len += 1 /* Include NULL terminator */;
451 /*
452 * The null-terminated, null-padded (see 4.4.2) SCSI
453 * NAME STRING field contains a UTF-8 format string.
454 * The number of bytes in the SCSI NAME STRING field
455 * (i.e., the value in the DESIGNATOR LENGTH field)
456 * shall be no larger than 256 and shall be a multiple
457 * of four.
458 */
459 if (padding)
460 scsi_name_len += padding;
461
462 buf[off-1] = scsi_name_len;
463 off += scsi_name_len;
464 /* Header size + Designation descriptor */
465 len += (scsi_name_len + 4);
466 }
467 set_len:
468 buf[2] = ((len >> 8) & 0xff);
469 buf[3] = (len & 0xff); /* Page Length for VPD 0x83 */
470 return 0;
471 }
472
473 /* Extended INQUIRY Data VPD Page */
474 static int
475 target_emulate_evpd_86(struct se_cmd *cmd, unsigned char *buf)
476 {
477 if (cmd->data_length < 60)
478 return 0;
479
480 buf[2] = 0x3c;
481 /* Set HEADSUP, ORDSUP, SIMPSUP */
482 buf[5] = 0x07;
483
484 /* If WriteCache emulation is enabled, set V_SUP */
485 if (cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_write_cache > 0)
486 buf[6] = 0x01;
487 return 0;
488 }
489
490 /* Block Limits VPD page */
491 static int
492 target_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
497 /*
498 * Following sbc3r22 section 6.5.3 Block Limits VPD page, when
499 * emulate_tpu=1 or emulate_tpws=1 we will be expect a
500 * different page length for Thin Provisioning.
501 */
502 if (dev->se_sub_dev->se_dev_attrib.emulate_tpu || dev->se_sub_dev->se_dev_attrib.emulate_tpws)
503 have_tp = 1;
504
505 if (cmd->data_length < (0x10 + 4)) {
506 pr_debug("Received data_length: %u"
507 " too small for EVPD 0xb0\n",
508 cmd->data_length);
509 return -EINVAL;
510 }
511
512 if (have_tp && cmd->data_length < (0x3c + 4)) {
513 pr_debug("Received data_length: %u"
514 " too small for TPE=1 EVPD 0xb0\n",
515 cmd->data_length);
516 have_tp = 0;
517 }
518
519 buf[0] = dev->transport->get_device_type(dev);
520 buf[3] = have_tp ? 0x3c : 0x10;
521
522 /* Set WSNZ to 1 */
523 buf[4] = 0x01;
524
525 /*
526 * Set OPTIMAL TRANSFER LENGTH GRANULARITY
527 */
528 put_unaligned_be16(1, &buf[6]);
529
530 /*
531 * Set MAXIMUM TRANSFER LENGTH
532 */
533 put_unaligned_be32(dev->se_sub_dev->se_dev_attrib.max_sectors, &buf[8]);
534
535 /*
536 * Set OPTIMAL TRANSFER LENGTH
537 */
538 put_unaligned_be32(dev->se_sub_dev->se_dev_attrib.optimal_sectors, &buf[12]);
539
540 /*
541 * Exit now if we don't support TP or the initiator sent a too
542 * short buffer.
543 */
544 if (!have_tp || cmd->data_length < (0x3c + 4))
545 return 0;
546
547 /*
548 * Set MAXIMUM UNMAP LBA COUNT
549 */
550 put_unaligned_be32(dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count, &buf[20]);
551
552 /*
553 * Set MAXIMUM UNMAP BLOCK DESCRIPTOR COUNT
554 */
555 put_unaligned_be32(dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count,
556 &buf[24]);
557
558 /*
559 * Set OPTIMAL UNMAP GRANULARITY
560 */
561 put_unaligned_be32(dev->se_sub_dev->se_dev_attrib.unmap_granularity, &buf[28]);
562
563 /*
564 * UNMAP GRANULARITY ALIGNMENT
565 */
566 put_unaligned_be32(dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment,
567 &buf[32]);
568 if (dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment != 0)
569 buf[32] |= 0x80; /* Set the UGAVALID bit */
570
571 return 0;
572 }
573
574 /* Block Device Characteristics VPD page */
575 static int
576 target_emulate_evpd_b1(struct se_cmd *cmd, unsigned char *buf)
577 {
578 struct se_device *dev = cmd->se_dev;
579
580 buf[0] = dev->transport->get_device_type(dev);
581 buf[3] = 0x3c;
582
583 if (cmd->data_length >= 5 &&
584 dev->se_sub_dev->se_dev_attrib.is_nonrot)
585 buf[5] = 1;
586
587 return 0;
588 }
589
590 /* Thin Provisioning VPD */
591 static int
592 target_emulate_evpd_b2(struct se_cmd *cmd, unsigned char *buf)
593 {
594 struct se_device *dev = cmd->se_dev;
595
596 /*
597 * From sbc3r22 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->se_sub_dev->se_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->se_sub_dev->se_dev_attrib.emulate_tpws != 0)
637 buf[5] |= 0x40;
638
639 return 0;
640 }
641
642 static int
643 target_emulate_evpd_00(struct se_cmd *cmd, unsigned char *buf);
644
645 static struct {
646 uint8_t page;
647 int (*emulate)(struct se_cmd *, unsigned char *);
648 } evpd_handlers[] = {
649 { .page = 0x00, .emulate = target_emulate_evpd_00 },
650 { .page = 0x80, .emulate = target_emulate_evpd_80 },
651 { .page = 0x83, .emulate = target_emulate_evpd_83 },
652 { .page = 0x86, .emulate = target_emulate_evpd_86 },
653 { .page = 0xb0, .emulate = target_emulate_evpd_b0 },
654 { .page = 0xb1, .emulate = target_emulate_evpd_b1 },
655 { .page = 0xb2, .emulate = target_emulate_evpd_b2 },
656 };
657
658 /* supported vital product data pages */
659 static int
660 target_emulate_evpd_00(struct se_cmd *cmd, unsigned char *buf)
661 {
662 int p;
663
664 if (cmd->data_length < 8)
665 return 0;
666 /*
667 * Only report the INQUIRY EVPD=1 pages after a valid NAA
668 * Registered Extended LUN WWN has been set via ConfigFS
669 * during device creation/restart.
670 */
671 if (cmd->se_dev->se_sub_dev->su_dev_flags &
672 SDF_EMULATED_VPD_UNIT_SERIAL) {
673 buf[3] = ARRAY_SIZE(evpd_handlers);
674 for (p = 0; p < min_t(int, ARRAY_SIZE(evpd_handlers),
675 cmd->data_length - 4); ++p)
676 buf[p + 4] = evpd_handlers[p].page;
677 }
678
679 return 0;
680 }
681
682 static int
683 target_emulate_inquiry(struct se_task *task)
684 {
685 struct se_cmd *cmd = task->task_se_cmd;
686 struct se_device *dev = cmd->se_dev;
687 unsigned char *buf;
688 unsigned char *cdb = cmd->t_task_cdb;
689 int p, ret;
690
691 if (!(cdb[1] & 0x1)) {
692 ret = target_emulate_inquiry_std(cmd);
693 goto out;
694 }
695
696 /*
697 * Make sure we at least have 4 bytes of INQUIRY response
698 * payload for 0x00 going back for EVPD=1. Note that 0x80
699 * and 0x83 will check for enough payload data length and
700 * jump to set_len: label when there is not enough inquiry EVPD
701 * payload length left for the next outgoing EVPD metadata
702 */
703 if (cmd->data_length < 4) {
704 pr_err("SCSI Inquiry payload length: %u"
705 " too small for EVPD=1\n", cmd->data_length);
706 return -EINVAL;
707 }
708
709 buf = transport_kmap_first_data_page(cmd);
710
711 buf[0] = dev->transport->get_device_type(dev);
712
713 for (p = 0; p < ARRAY_SIZE(evpd_handlers); ++p) {
714 if (cdb[2] == evpd_handlers[p].page) {
715 buf[1] = cdb[2];
716 ret = evpd_handlers[p].emulate(cmd, buf);
717 goto out_unmap;
718 }
719 }
720
721 pr_err("Unknown VPD Code: 0x%02x\n", cdb[2]);
722 ret = -EINVAL;
723
724 out_unmap:
725 transport_kunmap_first_data_page(cmd);
726 out:
727 if (!ret) {
728 task->task_scsi_status = GOOD;
729 transport_complete_task(task, 1);
730 }
731 return ret;
732 }
733
734 static int
735 target_emulate_readcapacity(struct se_task *task)
736 {
737 struct se_cmd *cmd = task->task_se_cmd;
738 struct se_device *dev = cmd->se_dev;
739 unsigned char *buf;
740 unsigned long long blocks_long = dev->transport->get_blocks(dev);
741 u32 blocks;
742
743 if (blocks_long >= 0x00000000ffffffff)
744 blocks = 0xffffffff;
745 else
746 blocks = (u32)blocks_long;
747
748 buf = transport_kmap_first_data_page(cmd);
749
750 buf[0] = (blocks >> 24) & 0xff;
751 buf[1] = (blocks >> 16) & 0xff;
752 buf[2] = (blocks >> 8) & 0xff;
753 buf[3] = blocks & 0xff;
754 buf[4] = (dev->se_sub_dev->se_dev_attrib.block_size >> 24) & 0xff;
755 buf[5] = (dev->se_sub_dev->se_dev_attrib.block_size >> 16) & 0xff;
756 buf[6] = (dev->se_sub_dev->se_dev_attrib.block_size >> 8) & 0xff;
757 buf[7] = dev->se_sub_dev->se_dev_attrib.block_size & 0xff;
758 /*
759 * Set max 32-bit blocks to signal SERVICE ACTION READ_CAPACITY_16
760 */
761 if (dev->se_sub_dev->se_dev_attrib.emulate_tpu || dev->se_sub_dev->se_dev_attrib.emulate_tpws)
762 put_unaligned_be32(0xFFFFFFFF, &buf[0]);
763
764 transport_kunmap_first_data_page(cmd);
765
766 task->task_scsi_status = GOOD;
767 transport_complete_task(task, 1);
768 return 0;
769 }
770
771 static int
772 target_emulate_readcapacity_16(struct se_task *task)
773 {
774 struct se_cmd *cmd = task->task_se_cmd;
775 struct se_device *dev = cmd->se_dev;
776 unsigned char *buf;
777 unsigned long long blocks = dev->transport->get_blocks(dev);
778
779 buf = transport_kmap_first_data_page(cmd);
780
781 buf[0] = (blocks >> 56) & 0xff;
782 buf[1] = (blocks >> 48) & 0xff;
783 buf[2] = (blocks >> 40) & 0xff;
784 buf[3] = (blocks >> 32) & 0xff;
785 buf[4] = (blocks >> 24) & 0xff;
786 buf[5] = (blocks >> 16) & 0xff;
787 buf[6] = (blocks >> 8) & 0xff;
788 buf[7] = blocks & 0xff;
789 buf[8] = (dev->se_sub_dev->se_dev_attrib.block_size >> 24) & 0xff;
790 buf[9] = (dev->se_sub_dev->se_dev_attrib.block_size >> 16) & 0xff;
791 buf[10] = (dev->se_sub_dev->se_dev_attrib.block_size >> 8) & 0xff;
792 buf[11] = dev->se_sub_dev->se_dev_attrib.block_size & 0xff;
793 /*
794 * Set Thin Provisioning Enable bit following sbc3r22 in section
795 * READ CAPACITY (16) byte 14 if emulate_tpu or emulate_tpws is enabled.
796 */
797 if (dev->se_sub_dev->se_dev_attrib.emulate_tpu || dev->se_sub_dev->se_dev_attrib.emulate_tpws)
798 buf[14] = 0x80;
799
800 transport_kunmap_first_data_page(cmd);
801
802 task->task_scsi_status = GOOD;
803 transport_complete_task(task, 1);
804 return 0;
805 }
806
807 static int
808 target_modesense_rwrecovery(unsigned char *p)
809 {
810 p[0] = 0x01;
811 p[1] = 0x0a;
812
813 return 12;
814 }
815
816 static int
817 target_modesense_control(struct se_device *dev, unsigned char *p)
818 {
819 p[0] = 0x0a;
820 p[1] = 0x0a;
821 p[2] = 2;
822 /*
823 * From spc4r23, 7.4.7 Control mode page
824 *
825 * The QUEUE ALGORITHM MODIFIER field (see table 368) specifies
826 * restrictions on the algorithm used for reordering commands
827 * having the SIMPLE task attribute (see SAM-4).
828 *
829 * Table 368 -- QUEUE ALGORITHM MODIFIER field
830 * Code Description
831 * 0h Restricted reordering
832 * 1h Unrestricted reordering allowed
833 * 2h to 7h Reserved
834 * 8h to Fh Vendor specific
835 *
836 * A value of zero in the QUEUE ALGORITHM MODIFIER field specifies that
837 * the device server shall order the processing sequence of commands
838 * having the SIMPLE task attribute such that data integrity is maintained
839 * for that I_T nexus (i.e., if the transmission of new SCSI transport protocol
840 * requests is halted at any time, the final value of all data observable
841 * on the medium shall be the same as if all the commands had been processed
842 * with the ORDERED task attribute).
843 *
844 * A value of one in the QUEUE ALGORITHM MODIFIER field specifies that the
845 * device server may reorder the processing sequence of commands having the
846 * SIMPLE task attribute in any manner. Any data integrity exposures related to
847 * command sequence order shall be explicitly handled by the application client
848 * through the selection of appropriate ommands and task attributes.
849 */
850 p[3] = (dev->se_sub_dev->se_dev_attrib.emulate_rest_reord == 1) ? 0x00 : 0x10;
851 /*
852 * From spc4r17, section 7.4.6 Control mode Page
853 *
854 * Unit Attention interlocks control (UN_INTLCK_CTRL) to code 00b
855 *
856 * 00b: The logical unit shall clear any unit attention condition
857 * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION
858 * status and shall not establish a unit attention condition when a com-
859 * mand is completed with BUSY, TASK SET FULL, or RESERVATION CONFLICT
860 * status.
861 *
862 * 10b: The logical unit shall not clear any unit attention condition
863 * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION
864 * status and shall not establish a unit attention condition when
865 * a command is completed with BUSY, TASK SET FULL, or RESERVATION
866 * CONFLICT status.
867 *
868 * 11b a The logical unit shall not clear any unit attention condition
869 * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION
870 * status and shall establish a unit attention condition for the
871 * initiator port associated with the I_T nexus on which the BUSY,
872 * TASK SET FULL, or RESERVATION CONFLICT status is being returned.
873 * Depending on the status, the additional sense code shall be set to
874 * PREVIOUS BUSY STATUS, PREVIOUS TASK SET FULL STATUS, or PREVIOUS
875 * RESERVATION CONFLICT STATUS. Until it is cleared by a REQUEST SENSE
876 * command, a unit attention condition shall be established only once
877 * for a BUSY, TASK SET FULL, or RESERVATION CONFLICT status regardless
878 * to the number of commands completed with one of those status codes.
879 */
880 p[4] = (dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2) ? 0x30 :
881 (dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 1) ? 0x20 : 0x00;
882 /*
883 * From spc4r17, section 7.4.6 Control mode Page
884 *
885 * Task Aborted Status (TAS) bit set to zero.
886 *
887 * A task aborted status (TAS) bit set to zero specifies that aborted
888 * tasks shall be terminated by the device server without any response
889 * to the application client. A TAS bit set to one specifies that tasks
890 * aborted by the actions of an I_T nexus other than the I_T nexus on
891 * which the command was received shall be completed with TASK ABORTED
892 * status (see SAM-4).
893 */
894 p[5] = (dev->se_sub_dev->se_dev_attrib.emulate_tas) ? 0x40 : 0x00;
895 p[8] = 0xff;
896 p[9] = 0xff;
897 p[11] = 30;
898
899 return 12;
900 }
901
902 static int
903 target_modesense_caching(struct se_device *dev, unsigned char *p)
904 {
905 p[0] = 0x08;
906 p[1] = 0x12;
907 if (dev->se_sub_dev->se_dev_attrib.emulate_write_cache > 0)
908 p[2] = 0x04; /* Write Cache Enable */
909 p[12] = 0x20; /* Disabled Read Ahead */
910
911 return 20;
912 }
913
914 static void
915 target_modesense_write_protect(unsigned char *buf, int type)
916 {
917 /*
918 * I believe that the WP bit (bit 7) in the mode header is the same for
919 * all device types..
920 */
921 switch (type) {
922 case TYPE_DISK:
923 case TYPE_TAPE:
924 default:
925 buf[0] |= 0x80; /* WP bit */
926 break;
927 }
928 }
929
930 static void
931 target_modesense_dpofua(unsigned char *buf, int type)
932 {
933 switch (type) {
934 case TYPE_DISK:
935 buf[0] |= 0x10; /* DPOFUA bit */
936 break;
937 default:
938 break;
939 }
940 }
941
942 static int
943 target_emulate_modesense(struct se_task *task)
944 {
945 struct se_cmd *cmd = task->task_se_cmd;
946 struct se_device *dev = cmd->se_dev;
947 char *cdb = cmd->t_task_cdb;
948 unsigned char *rbuf;
949 int type = dev->transport->get_device_type(dev);
950 int ten = (cmd->t_task_cdb[0] == MODE_SENSE_10);
951 int offset = ten ? 8 : 4;
952 int length = 0;
953 unsigned char buf[SE_MODE_PAGE_BUF];
954
955 memset(buf, 0, SE_MODE_PAGE_BUF);
956
957 switch (cdb[2] & 0x3f) {
958 case 0x01:
959 length = target_modesense_rwrecovery(&buf[offset]);
960 break;
961 case 0x08:
962 length = target_modesense_caching(dev, &buf[offset]);
963 break;
964 case 0x0a:
965 length = target_modesense_control(dev, &buf[offset]);
966 break;
967 case 0x3f:
968 length = target_modesense_rwrecovery(&buf[offset]);
969 length += target_modesense_caching(dev, &buf[offset+length]);
970 length += target_modesense_control(dev, &buf[offset+length]);
971 break;
972 default:
973 pr_err("MODE SENSE: unimplemented page/subpage: 0x%02x/0x%02x\n",
974 cdb[2] & 0x3f, cdb[3]);
975 return PYX_TRANSPORT_UNKNOWN_MODE_PAGE;
976 }
977 offset += length;
978
979 if (ten) {
980 offset -= 2;
981 buf[0] = (offset >> 8) & 0xff;
982 buf[1] = offset & 0xff;
983
984 if ((cmd->se_lun->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY) ||
985 (cmd->se_deve &&
986 (cmd->se_deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY)))
987 target_modesense_write_protect(&buf[3], type);
988
989 if ((dev->se_sub_dev->se_dev_attrib.emulate_write_cache > 0) &&
990 (dev->se_sub_dev->se_dev_attrib.emulate_fua_write > 0))
991 target_modesense_dpofua(&buf[3], type);
992
993 if ((offset + 2) > cmd->data_length)
994 offset = cmd->data_length;
995
996 } else {
997 offset -= 1;
998 buf[0] = 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[2], 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[2], type);
1008
1009 if ((offset + 1) > cmd->data_length)
1010 offset = cmd->data_length;
1011 }
1012
1013 rbuf = transport_kmap_first_data_page(cmd);
1014 memcpy(rbuf, buf, offset);
1015 transport_kunmap_first_data_page(cmd);
1016
1017 task->task_scsi_status = GOOD;
1018 transport_complete_task(task, 1);
1019 return 0;
1020 }
1021
1022 static int
1023 target_emulate_request_sense(struct se_task *task)
1024 {
1025 struct se_cmd *cmd = task->task_se_cmd;
1026 unsigned char *cdb = cmd->t_task_cdb;
1027 unsigned char *buf;
1028 u8 ua_asc = 0, ua_ascq = 0;
1029 int err = 0;
1030
1031 if (cdb[1] & 0x01) {
1032 pr_err("REQUEST_SENSE description emulation not"
1033 " supported\n");
1034 return PYX_TRANSPORT_INVALID_CDB_FIELD;
1035 }
1036
1037 buf = transport_kmap_first_data_page(cmd);
1038
1039 if (!core_scsi3_ua_clear_for_request_sense(cmd, &ua_asc, &ua_ascq)) {
1040 /*
1041 * CURRENT ERROR, UNIT ATTENTION
1042 */
1043 buf[0] = 0x70;
1044 buf[SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
1045 /*
1046 * Make sure request data length is enough for additional
1047 * sense data.
1048 */
1049 if (cmd->data_length <= 18) {
1050 buf[7] = 0x00;
1051 err = -EINVAL;
1052 goto end;
1053 }
1054 /*
1055 * The Additional Sense Code (ASC) from the UNIT ATTENTION
1056 */
1057 buf[SPC_ASC_KEY_OFFSET] = ua_asc;
1058 buf[SPC_ASCQ_KEY_OFFSET] = ua_ascq;
1059 buf[7] = 0x0A;
1060 } else {
1061 /*
1062 * CURRENT ERROR, NO SENSE
1063 */
1064 buf[0] = 0x70;
1065 buf[SPC_SENSE_KEY_OFFSET] = NO_SENSE;
1066 /*
1067 * Make sure request data length is enough for additional
1068 * sense data.
1069 */
1070 if (cmd->data_length <= 18) {
1071 buf[7] = 0x00;
1072 err = -EINVAL;
1073 goto end;
1074 }
1075 /*
1076 * NO ADDITIONAL SENSE INFORMATION
1077 */
1078 buf[SPC_ASC_KEY_OFFSET] = 0x00;
1079 buf[7] = 0x0A;
1080 }
1081
1082 end:
1083 transport_kunmap_first_data_page(cmd);
1084 task->task_scsi_status = GOOD;
1085 transport_complete_task(task, 1);
1086 return 0;
1087 }
1088
1089 /*
1090 * Used for TCM/IBLOCK and TCM/FILEIO for block/blk-lib.c level discard support.
1091 * Note this is not used for TCM/pSCSI passthrough
1092 */
1093 static int
1094 target_emulate_unmap(struct se_task *task)
1095 {
1096 struct se_cmd *cmd = task->task_se_cmd;
1097 struct se_device *dev = cmd->se_dev;
1098 unsigned char *buf, *ptr = NULL;
1099 unsigned char *cdb = &cmd->t_task_cdb[0];
1100 sector_t lba;
1101 unsigned int size = cmd->data_length, range;
1102 int ret = 0, offset;
1103 unsigned short dl, bd_dl;
1104
1105 if (!dev->transport->do_discard) {
1106 pr_err("UNMAP emulation not supported for: %s\n",
1107 dev->transport->name);
1108 return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
1109 }
1110
1111 /* First UNMAP block descriptor starts at 8 byte offset */
1112 offset = 8;
1113 size -= 8;
1114 dl = get_unaligned_be16(&cdb[0]);
1115 bd_dl = get_unaligned_be16(&cdb[2]);
1116
1117 buf = transport_kmap_first_data_page(cmd);
1118
1119 ptr = &buf[offset];
1120 pr_debug("UNMAP: Sub: %s Using dl: %hu bd_dl: %hu size: %hu"
1121 " ptr: %p\n", dev->transport->name, dl, bd_dl, size, ptr);
1122
1123 while (size) {
1124 lba = get_unaligned_be64(&ptr[0]);
1125 range = get_unaligned_be32(&ptr[8]);
1126 pr_debug("UNMAP: Using lba: %llu and range: %u\n",
1127 (unsigned long long)lba, range);
1128
1129 ret = dev->transport->do_discard(dev, lba, range);
1130 if (ret < 0) {
1131 pr_err("blkdev_issue_discard() failed: %d\n",
1132 ret);
1133 goto err;
1134 }
1135
1136 ptr += 16;
1137 size -= 16;
1138 }
1139
1140 err:
1141 transport_kunmap_first_data_page(cmd);
1142 if (!ret) {
1143 task->task_scsi_status = GOOD;
1144 transport_complete_task(task, 1);
1145 }
1146 return ret;
1147 }
1148
1149 /*
1150 * Used for TCM/IBLOCK and TCM/FILEIO for block/blk-lib.c level discard support.
1151 * Note this is not used for TCM/pSCSI passthrough
1152 */
1153 static int
1154 target_emulate_write_same(struct se_task *task)
1155 {
1156 struct se_cmd *cmd = task->task_se_cmd;
1157 struct se_device *dev = cmd->se_dev;
1158 sector_t range;
1159 sector_t lba = cmd->t_task_lba;
1160 u32 num_blocks;
1161 int ret;
1162
1163 if (!dev->transport->do_discard) {
1164 pr_err("WRITE_SAME emulation not supported"
1165 " for: %s\n", dev->transport->name);
1166 return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
1167 }
1168
1169 if (cmd->t_task_cdb[0] == WRITE_SAME)
1170 num_blocks = get_unaligned_be16(&cmd->t_task_cdb[7]);
1171 else if (cmd->t_task_cdb[0] == WRITE_SAME_16)
1172 num_blocks = get_unaligned_be32(&cmd->t_task_cdb[10]);
1173 else /* WRITE_SAME_32 via VARIABLE_LENGTH_CMD */
1174 num_blocks = get_unaligned_be32(&cmd->t_task_cdb[28]);
1175
1176 /*
1177 * Use the explicit range when non zero is supplied, otherwise calculate
1178 * the remaining range based on ->get_blocks() - starting LBA.
1179 */
1180 if (num_blocks != 0)
1181 range = num_blocks;
1182 else
1183 range = (dev->transport->get_blocks(dev) - lba);
1184
1185 pr_debug("WRITE_SAME UNMAP: LBA: %llu Range: %llu\n",
1186 (unsigned long long)lba, (unsigned long long)range);
1187
1188 ret = dev->transport->do_discard(dev, lba, range);
1189 if (ret < 0) {
1190 pr_debug("blkdev_issue_discard() failed for WRITE_SAME\n");
1191 return ret;
1192 }
1193
1194 task->task_scsi_status = GOOD;
1195 transport_complete_task(task, 1);
1196 return 0;
1197 }
1198
1199 static int
1200 target_emulate_synchronize_cache(struct se_task *task)
1201 {
1202 struct se_device *dev = task->task_se_cmd->se_dev;
1203
1204 if (!dev->transport->do_sync_cache) {
1205 pr_err("SYNCHRONIZE_CACHE emulation not supported"
1206 " for: %s\n", dev->transport->name);
1207 return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
1208 }
1209
1210 dev->transport->do_sync_cache(task);
1211 return 0;
1212 }
1213
1214 static int
1215 target_emulate_noop(struct se_task *task)
1216 {
1217 task->task_scsi_status = GOOD;
1218 transport_complete_task(task, 1);
1219 return 0;
1220 }
1221
1222 int
1223 transport_emulate_control_cdb(struct se_task *task)
1224 {
1225 struct se_cmd *cmd = task->task_se_cmd;
1226 struct se_device *dev = cmd->se_dev;
1227 unsigned short service_action;
1228 int ret = 0;
1229
1230 switch (cmd->t_task_cdb[0]) {
1231 case INQUIRY:
1232 ret = target_emulate_inquiry(task);
1233 break;
1234 case READ_CAPACITY:
1235 ret = target_emulate_readcapacity(task);
1236 break;
1237 case MODE_SENSE:
1238 ret = target_emulate_modesense(task);
1239 break;
1240 case MODE_SENSE_10:
1241 ret = target_emulate_modesense(task);
1242 break;
1243 case SERVICE_ACTION_IN:
1244 switch (cmd->t_task_cdb[1] & 0x1f) {
1245 case SAI_READ_CAPACITY_16:
1246 ret = target_emulate_readcapacity_16(task);
1247 break;
1248 default:
1249 pr_err("Unsupported SA: 0x%02x\n",
1250 cmd->t_task_cdb[1] & 0x1f);
1251 return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
1252 }
1253 break;
1254 case REQUEST_SENSE:
1255 ret = target_emulate_request_sense(task);
1256 break;
1257 case UNMAP:
1258 ret = target_emulate_unmap(task);
1259 break;
1260 case WRITE_SAME:
1261 ret = target_emulate_write_same(task);
1262 break;
1263 case WRITE_SAME_16:
1264 ret = target_emulate_write_same(task);
1265 break;
1266 case VARIABLE_LENGTH_CMD:
1267 service_action =
1268 get_unaligned_be16(&cmd->t_task_cdb[8]);
1269 switch (service_action) {
1270 case WRITE_SAME_32:
1271 ret = target_emulate_write_same(task);
1272 break;
1273 default:
1274 pr_err("Unsupported VARIABLE_LENGTH_CMD SA:"
1275 " 0x%02x\n", service_action);
1276 break;
1277 }
1278 break;
1279 case SYNCHRONIZE_CACHE:
1280 case 0x91: /* SYNCHRONIZE_CACHE_16: */
1281 ret = target_emulate_synchronize_cache(task);
1282 break;
1283 case ALLOW_MEDIUM_REMOVAL:
1284 case ERASE:
1285 case REZERO_UNIT:
1286 case SEEK_10:
1287 case SPACE:
1288 case START_STOP:
1289 case TEST_UNIT_READY:
1290 case VERIFY:
1291 case WRITE_FILEMARKS:
1292 ret = target_emulate_noop(task);
1293 break;
1294 default:
1295 pr_err("Unsupported SCSI Opcode: 0x%02x for %s\n",
1296 cmd->t_task_cdb[0], dev->transport->name);
1297 return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
1298 }
1299
1300 if (ret < 0)
1301 return ret;
1302 return PYX_TRANSPORT_SENT_TO_TRANSPORT;
1303 }
1304
1305 /*
1306 * Write a CDB into @cdb that is based on the one the intiator sent us,
1307 * but updated to only cover the sectors that the current task handles.
1308 */
1309 void target_get_task_cdb(struct se_task *task, unsigned char *cdb)
1310 {
1311 struct se_cmd *cmd = task->task_se_cmd;
1312 unsigned int cdb_len = scsi_command_size(cmd->t_task_cdb);
1313
1314 memcpy(cdb, cmd->t_task_cdb, cdb_len);
1315 if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) {
1316 unsigned long long lba = task->task_lba;
1317 u32 sectors = task->task_sectors;
1318
1319 switch (cdb_len) {
1320 case 6:
1321 /* 21-bit LBA and 8-bit sectors */
1322 cdb[1] = (lba >> 16) & 0x1f;
1323 cdb[2] = (lba >> 8) & 0xff;
1324 cdb[3] = lba & 0xff;
1325 cdb[4] = sectors & 0xff;
1326 break;
1327 case 10:
1328 /* 32-bit LBA and 16-bit sectors */
1329 put_unaligned_be32(lba, &cdb[2]);
1330 put_unaligned_be16(sectors, &cdb[7]);
1331 break;
1332 case 12:
1333 /* 32-bit LBA and 32-bit sectors */
1334 put_unaligned_be32(lba, &cdb[2]);
1335 put_unaligned_be32(sectors, &cdb[6]);
1336 break;
1337 case 16:
1338 /* 64-bit LBA and 32-bit sectors */
1339 put_unaligned_be64(lba, &cdb[2]);
1340 put_unaligned_be32(sectors, &cdb[10]);
1341 break;
1342 case 32:
1343 /* 64-bit LBA and 32-bit sectors, extended CDB */
1344 put_unaligned_be64(lba, &cdb[12]);
1345 put_unaligned_be32(sectors, &cdb[28]);
1346 break;
1347 default:
1348 BUG();
1349 }
1350 }
1351 }
1352 EXPORT_SYMBOL(target_get_task_cdb);
Linux kernel - Deliverables
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