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1 | // SPDX-License-Identifier: GPL-2.0-or-later | |
2 | /* | |
3 | * SCSI Primary Commands (SPC) parsing and emulation. | |
4 | * | |
5 | * (c) Copyright 2002-2013 Datera, Inc. | |
6 | * | |
7 | * Nicholas A. Bellinger <nab@kernel.org> | |
8 | */ | |
9 | ||
10 | #include <linux/kernel.h> | |
11 | #include <linux/module.h> | |
12 | #include <asm/unaligned.h> | |
13 | ||
14 | #include <scsi/scsi_proto.h> | |
15 | #include <scsi/scsi_common.h> | |
16 | #include <scsi/scsi_tcq.h> | |
17 | ||
18 | #include <target/target_core_base.h> | |
19 | #include <target/target_core_backend.h> | |
20 | #include <target/target_core_fabric.h> | |
21 | ||
22 | #include "target_core_internal.h" | |
23 | #include "target_core_alua.h" | |
24 | #include "target_core_pr.h" | |
25 | #include "target_core_ua.h" | |
26 | #include "target_core_xcopy.h" | |
27 | ||
28 | static void spc_fill_alua_data(struct se_lun *lun, unsigned char *buf) | |
29 | { | |
30 | struct t10_alua_tg_pt_gp *tg_pt_gp; | |
31 | ||
32 | /* | |
33 | * Set SCCS for MAINTENANCE_IN + REPORT_TARGET_PORT_GROUPS. | |
34 | */ | |
35 | buf[5] = 0x80; | |
36 | ||
37 | /* | |
38 | * Set TPGS field for explicit and/or implicit ALUA access type | |
39 | * and opteration. | |
40 | * | |
41 | * See spc4r17 section 6.4.2 Table 135 | |
42 | */ | |
43 | spin_lock(&lun->lun_tg_pt_gp_lock); | |
44 | tg_pt_gp = lun->lun_tg_pt_gp; | |
45 | if (tg_pt_gp) | |
46 | buf[5] |= tg_pt_gp->tg_pt_gp_alua_access_type; | |
47 | spin_unlock(&lun->lun_tg_pt_gp_lock); | |
48 | } | |
49 | ||
50 | sense_reason_t | |
51 | spc_emulate_inquiry_std(struct se_cmd *cmd, unsigned char *buf) | |
52 | { | |
53 | struct se_lun *lun = cmd->se_lun; | |
54 | struct se_device *dev = cmd->se_dev; | |
55 | struct se_session *sess = cmd->se_sess; | |
56 | ||
57 | /* Set RMB (removable media) for tape devices */ | |
58 | if (dev->transport->get_device_type(dev) == TYPE_TAPE) | |
59 | buf[1] = 0x80; | |
60 | ||
61 | buf[2] = 0x05; /* SPC-3 */ | |
62 | ||
63 | /* | |
64 | * NORMACA and HISUP = 0, RESPONSE DATA FORMAT = 2 | |
65 | * | |
66 | * SPC4 says: | |
67 | * A RESPONSE DATA FORMAT field set to 2h indicates that the | |
68 | * standard INQUIRY data is in the format defined in this | |
69 | * standard. Response data format values less than 2h are | |
70 | * obsolete. Response data format values greater than 2h are | |
71 | * reserved. | |
72 | */ | |
73 | buf[3] = 2; | |
74 | ||
75 | /* | |
76 | * Enable SCCS and TPGS fields for Emulated ALUA | |
77 | */ | |
78 | spc_fill_alua_data(lun, buf); | |
79 | ||
80 | /* | |
81 | * Set Third-Party Copy (3PC) bit to indicate support for EXTENDED_COPY | |
82 | */ | |
83 | if (dev->dev_attrib.emulate_3pc) | |
84 | buf[5] |= 0x8; | |
85 | /* | |
86 | * Set Protection (PROTECT) bit when DIF has been enabled on the | |
87 | * device, and the fabric supports VERIFY + PASS. Also report | |
88 | * PROTECT=1 if sess_prot_type has been configured to allow T10-PI | |
89 | * to unprotected devices. | |
90 | */ | |
91 | if (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) { | |
92 | if (dev->dev_attrib.pi_prot_type || cmd->se_sess->sess_prot_type) | |
93 | buf[5] |= 0x1; | |
94 | } | |
95 | ||
96 | buf[7] = 0x2; /* CmdQue=1 */ | |
97 | ||
98 | /* | |
99 | * ASCII data fields described as being left-aligned shall have any | |
100 | * unused bytes at the end of the field (i.e., highest offset) and the | |
101 | * unused bytes shall be filled with ASCII space characters (20h). | |
102 | */ | |
103 | memset(&buf[8], 0x20, | |
104 | INQUIRY_VENDOR_LEN + INQUIRY_MODEL_LEN + INQUIRY_REVISION_LEN); | |
105 | memcpy(&buf[8], dev->t10_wwn.vendor, | |
106 | strnlen(dev->t10_wwn.vendor, INQUIRY_VENDOR_LEN)); | |
107 | memcpy(&buf[16], dev->t10_wwn.model, | |
108 | strnlen(dev->t10_wwn.model, INQUIRY_MODEL_LEN)); | |
109 | memcpy(&buf[32], dev->t10_wwn.revision, | |
110 | strnlen(dev->t10_wwn.revision, INQUIRY_REVISION_LEN)); | |
111 | buf[4] = 31; /* Set additional length to 31 */ | |
112 | ||
113 | return 0; | |
114 | } | |
115 | EXPORT_SYMBOL(spc_emulate_inquiry_std); | |
116 | ||
117 | /* unit serial number */ | |
118 | static sense_reason_t | |
119 | spc_emulate_evpd_80(struct se_cmd *cmd, unsigned char *buf) | |
120 | { | |
121 | struct se_device *dev = cmd->se_dev; | |
122 | u16 len; | |
123 | ||
124 | if (dev->dev_flags & DF_EMULATED_VPD_UNIT_SERIAL) { | |
125 | len = sprintf(&buf[4], "%s", dev->t10_wwn.unit_serial); | |
126 | len++; /* Extra Byte for NULL Terminator */ | |
127 | buf[3] = len; | |
128 | } | |
129 | return 0; | |
130 | } | |
131 | ||
132 | void spc_parse_naa_6h_vendor_specific(struct se_device *dev, | |
133 | unsigned char *buf) | |
134 | { | |
135 | unsigned char *p = &dev->t10_wwn.unit_serial[0]; | |
136 | int cnt; | |
137 | bool next = true; | |
138 | ||
139 | /* | |
140 | * Generate up to 36 bits of VENDOR SPECIFIC IDENTIFIER starting on | |
141 | * byte 3 bit 3-0 for NAA IEEE Registered Extended DESIGNATOR field | |
142 | * format, followed by 64 bits of VENDOR SPECIFIC IDENTIFIER EXTENSION | |
143 | * to complete the payload. These are based from VPD=0x80 PRODUCT SERIAL | |
144 | * NUMBER set via vpd_unit_serial in target_core_configfs.c to ensure | |
145 | * per device uniqeness. | |
146 | */ | |
147 | for (cnt = 0; *p && cnt < 13; p++) { | |
148 | int val = hex_to_bin(*p); | |
149 | ||
150 | if (val < 0) | |
151 | continue; | |
152 | ||
153 | if (next) { | |
154 | next = false; | |
155 | buf[cnt++] |= val; | |
156 | } else { | |
157 | next = true; | |
158 | buf[cnt] = val << 4; | |
159 | } | |
160 | } | |
161 | } | |
162 | ||
163 | /* | |
164 | * Device identification VPD, for a complete list of | |
165 | * DESIGNATOR TYPEs see spc4r17 Table 459. | |
166 | */ | |
167 | sense_reason_t | |
168 | spc_emulate_evpd_83(struct se_cmd *cmd, unsigned char *buf) | |
169 | { | |
170 | struct se_device *dev = cmd->se_dev; | |
171 | struct se_lun *lun = cmd->se_lun; | |
172 | struct se_portal_group *tpg = NULL; | |
173 | struct t10_alua_lu_gp_member *lu_gp_mem; | |
174 | struct t10_alua_tg_pt_gp *tg_pt_gp; | |
175 | unsigned char *prod = &dev->t10_wwn.model[0]; | |
176 | u32 prod_len; | |
177 | u32 unit_serial_len, off = 0; | |
178 | u16 len = 0, id_len; | |
179 | ||
180 | off = 4; | |
181 | ||
182 | /* | |
183 | * NAA IEEE Registered Extended Assigned designator format, see | |
184 | * spc4r17 section 7.7.3.6.5 | |
185 | * | |
186 | * We depend upon a target_core_mod/ConfigFS provided | |
187 | * /sys/kernel/config/target/core/$HBA/$DEV/wwn/vpd_unit_serial | |
188 | * value in order to return the NAA id. | |
189 | */ | |
190 | if (!(dev->dev_flags & DF_EMULATED_VPD_UNIT_SERIAL)) | |
191 | goto check_t10_vend_desc; | |
192 | ||
193 | /* CODE SET == Binary */ | |
194 | buf[off++] = 0x1; | |
195 | ||
196 | /* Set ASSOCIATION == addressed logical unit: 0)b */ | |
197 | buf[off] = 0x00; | |
198 | ||
199 | /* Identifier/Designator type == NAA identifier */ | |
200 | buf[off++] |= 0x3; | |
201 | off++; | |
202 | ||
203 | /* Identifier/Designator length */ | |
204 | buf[off++] = 0x10; | |
205 | ||
206 | /* | |
207 | * Start NAA IEEE Registered Extended Identifier/Designator | |
208 | */ | |
209 | buf[off++] = (0x6 << 4); | |
210 | ||
211 | /* | |
212 | * Use OpenFabrics IEEE Company ID: 00 14 05 | |
213 | */ | |
214 | buf[off++] = 0x01; | |
215 | buf[off++] = 0x40; | |
216 | buf[off] = (0x5 << 4); | |
217 | ||
218 | /* | |
219 | * Return ConfigFS Unit Serial Number information for | |
220 | * VENDOR_SPECIFIC_IDENTIFIER and | |
221 | * VENDOR_SPECIFIC_IDENTIFIER_EXTENTION | |
222 | */ | |
223 | spc_parse_naa_6h_vendor_specific(dev, &buf[off]); | |
224 | ||
225 | len = 20; | |
226 | off = (len + 4); | |
227 | ||
228 | check_t10_vend_desc: | |
229 | /* | |
230 | * T10 Vendor Identifier Page, see spc4r17 section 7.7.3.4 | |
231 | */ | |
232 | id_len = 8; /* For Vendor field */ | |
233 | prod_len = 4; /* For VPD Header */ | |
234 | prod_len += 8; /* For Vendor field */ | |
235 | prod_len += strlen(prod); | |
236 | prod_len++; /* For : */ | |
237 | ||
238 | if (dev->dev_flags & DF_EMULATED_VPD_UNIT_SERIAL) { | |
239 | unit_serial_len = strlen(&dev->t10_wwn.unit_serial[0]); | |
240 | unit_serial_len++; /* For NULL Terminator */ | |
241 | ||
242 | id_len += sprintf(&buf[off+12], "%s:%s", prod, | |
243 | &dev->t10_wwn.unit_serial[0]); | |
244 | } | |
245 | buf[off] = 0x2; /* ASCII */ | |
246 | buf[off+1] = 0x1; /* T10 Vendor ID */ | |
247 | buf[off+2] = 0x0; | |
248 | /* left align Vendor ID and pad with spaces */ | |
249 | memset(&buf[off+4], 0x20, INQUIRY_VENDOR_LEN); | |
250 | memcpy(&buf[off+4], dev->t10_wwn.vendor, | |
251 | strnlen(dev->t10_wwn.vendor, INQUIRY_VENDOR_LEN)); | |
252 | /* Extra Byte for NULL Terminator */ | |
253 | id_len++; | |
254 | /* Identifier Length */ | |
255 | buf[off+3] = id_len; | |
256 | /* Header size for Designation descriptor */ | |
257 | len += (id_len + 4); | |
258 | off += (id_len + 4); | |
259 | ||
260 | if (1) { | |
261 | struct t10_alua_lu_gp *lu_gp; | |
262 | u32 padding, scsi_name_len, scsi_target_len; | |
263 | u16 lu_gp_id = 0; | |
264 | u16 tg_pt_gp_id = 0; | |
265 | u16 tpgt; | |
266 | ||
267 | tpg = lun->lun_tpg; | |
268 | /* | |
269 | * Relative target port identifer, see spc4r17 | |
270 | * section 7.7.3.7 | |
271 | * | |
272 | * Get the PROTOCOL IDENTIFIER as defined by spc4r17 | |
273 | * section 7.5.1 Table 362 | |
274 | */ | |
275 | buf[off] = tpg->proto_id << 4; | |
276 | buf[off++] |= 0x1; /* CODE SET == Binary */ | |
277 | buf[off] = 0x80; /* Set PIV=1 */ | |
278 | /* Set ASSOCIATION == target port: 01b */ | |
279 | buf[off] |= 0x10; | |
280 | /* DESIGNATOR TYPE == Relative target port identifer */ | |
281 | buf[off++] |= 0x4; | |
282 | off++; /* Skip over Reserved */ | |
283 | buf[off++] = 4; /* DESIGNATOR LENGTH */ | |
284 | /* Skip over Obsolete field in RTPI payload | |
285 | * in Table 472 */ | |
286 | off += 2; | |
287 | put_unaligned_be16(lun->lun_rtpi, &buf[off]); | |
288 | off += 2; | |
289 | len += 8; /* Header size + Designation descriptor */ | |
290 | /* | |
291 | * Target port group identifier, see spc4r17 | |
292 | * section 7.7.3.8 | |
293 | * | |
294 | * Get the PROTOCOL IDENTIFIER as defined by spc4r17 | |
295 | * section 7.5.1 Table 362 | |
296 | */ | |
297 | spin_lock(&lun->lun_tg_pt_gp_lock); | |
298 | tg_pt_gp = lun->lun_tg_pt_gp; | |
299 | if (!tg_pt_gp) { | |
300 | spin_unlock(&lun->lun_tg_pt_gp_lock); | |
301 | goto check_lu_gp; | |
302 | } | |
303 | tg_pt_gp_id = tg_pt_gp->tg_pt_gp_id; | |
304 | spin_unlock(&lun->lun_tg_pt_gp_lock); | |
305 | ||
306 | buf[off] = tpg->proto_id << 4; | |
307 | buf[off++] |= 0x1; /* CODE SET == Binary */ | |
308 | buf[off] = 0x80; /* Set PIV=1 */ | |
309 | /* Set ASSOCIATION == target port: 01b */ | |
310 | buf[off] |= 0x10; | |
311 | /* DESIGNATOR TYPE == Target port group identifier */ | |
312 | buf[off++] |= 0x5; | |
313 | off++; /* Skip over Reserved */ | |
314 | buf[off++] = 4; /* DESIGNATOR LENGTH */ | |
315 | off += 2; /* Skip over Reserved Field */ | |
316 | put_unaligned_be16(tg_pt_gp_id, &buf[off]); | |
317 | off += 2; | |
318 | len += 8; /* Header size + Designation descriptor */ | |
319 | /* | |
320 | * Logical Unit Group identifier, see spc4r17 | |
321 | * section 7.7.3.8 | |
322 | */ | |
323 | check_lu_gp: | |
324 | lu_gp_mem = dev->dev_alua_lu_gp_mem; | |
325 | if (!lu_gp_mem) | |
326 | goto check_scsi_name; | |
327 | ||
328 | spin_lock(&lu_gp_mem->lu_gp_mem_lock); | |
329 | lu_gp = lu_gp_mem->lu_gp; | |
330 | if (!lu_gp) { | |
331 | spin_unlock(&lu_gp_mem->lu_gp_mem_lock); | |
332 | goto check_scsi_name; | |
333 | } | |
334 | lu_gp_id = lu_gp->lu_gp_id; | |
335 | spin_unlock(&lu_gp_mem->lu_gp_mem_lock); | |
336 | ||
337 | buf[off++] |= 0x1; /* CODE SET == Binary */ | |
338 | /* DESIGNATOR TYPE == Logical Unit Group identifier */ | |
339 | buf[off++] |= 0x6; | |
340 | off++; /* Skip over Reserved */ | |
341 | buf[off++] = 4; /* DESIGNATOR LENGTH */ | |
342 | off += 2; /* Skip over Reserved Field */ | |
343 | put_unaligned_be16(lu_gp_id, &buf[off]); | |
344 | off += 2; | |
345 | len += 8; /* Header size + Designation descriptor */ | |
346 | /* | |
347 | * SCSI name string designator, see spc4r17 | |
348 | * section 7.7.3.11 | |
349 | * | |
350 | * Get the PROTOCOL IDENTIFIER as defined by spc4r17 | |
351 | * section 7.5.1 Table 362 | |
352 | */ | |
353 | check_scsi_name: | |
354 | buf[off] = tpg->proto_id << 4; | |
355 | buf[off++] |= 0x3; /* CODE SET == UTF-8 */ | |
356 | buf[off] = 0x80; /* Set PIV=1 */ | |
357 | /* Set ASSOCIATION == target port: 01b */ | |
358 | buf[off] |= 0x10; | |
359 | /* DESIGNATOR TYPE == SCSI name string */ | |
360 | buf[off++] |= 0x8; | |
361 | off += 2; /* Skip over Reserved and length */ | |
362 | /* | |
363 | * SCSI name string identifer containing, $FABRIC_MOD | |
364 | * dependent information. For LIO-Target and iSCSI | |
365 | * Target Port, this means "<iSCSI name>,t,0x<TPGT> in | |
366 | * UTF-8 encoding. | |
367 | */ | |
368 | tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg); | |
369 | scsi_name_len = sprintf(&buf[off], "%s,t,0x%04x", | |
370 | tpg->se_tpg_tfo->tpg_get_wwn(tpg), tpgt); | |
371 | scsi_name_len += 1 /* Include NULL terminator */; | |
372 | /* | |
373 | * The null-terminated, null-padded (see 4.4.2) SCSI | |
374 | * NAME STRING field contains a UTF-8 format string. | |
375 | * The number of bytes in the SCSI NAME STRING field | |
376 | * (i.e., the value in the DESIGNATOR LENGTH field) | |
377 | * shall be no larger than 256 and shall be a multiple | |
378 | * of four. | |
379 | */ | |
380 | padding = ((-scsi_name_len) & 3); | |
381 | if (padding) | |
382 | scsi_name_len += padding; | |
383 | if (scsi_name_len > 256) | |
384 | scsi_name_len = 256; | |
385 | ||
386 | buf[off-1] = scsi_name_len; | |
387 | off += scsi_name_len; | |
388 | /* Header size + Designation descriptor */ | |
389 | len += (scsi_name_len + 4); | |
390 | ||
391 | /* | |
392 | * Target device designator | |
393 | */ | |
394 | buf[off] = tpg->proto_id << 4; | |
395 | buf[off++] |= 0x3; /* CODE SET == UTF-8 */ | |
396 | buf[off] = 0x80; /* Set PIV=1 */ | |
397 | /* Set ASSOCIATION == target device: 10b */ | |
398 | buf[off] |= 0x20; | |
399 | /* DESIGNATOR TYPE == SCSI name string */ | |
400 | buf[off++] |= 0x8; | |
401 | off += 2; /* Skip over Reserved and length */ | |
402 | /* | |
403 | * SCSI name string identifer containing, $FABRIC_MOD | |
404 | * dependent information. For LIO-Target and iSCSI | |
405 | * Target Port, this means "<iSCSI name>" in | |
406 | * UTF-8 encoding. | |
407 | */ | |
408 | scsi_target_len = sprintf(&buf[off], "%s", | |
409 | tpg->se_tpg_tfo->tpg_get_wwn(tpg)); | |
410 | scsi_target_len += 1 /* Include NULL terminator */; | |
411 | /* | |
412 | * The null-terminated, null-padded (see 4.4.2) SCSI | |
413 | * NAME STRING field contains a UTF-8 format string. | |
414 | * The number of bytes in the SCSI NAME STRING field | |
415 | * (i.e., the value in the DESIGNATOR LENGTH field) | |
416 | * shall be no larger than 256 and shall be a multiple | |
417 | * of four. | |
418 | */ | |
419 | padding = ((-scsi_target_len) & 3); | |
420 | if (padding) | |
421 | scsi_target_len += padding; | |
422 | if (scsi_target_len > 256) | |
423 | scsi_target_len = 256; | |
424 | ||
425 | buf[off-1] = scsi_target_len; | |
426 | off += scsi_target_len; | |
427 | ||
428 | /* Header size + Designation descriptor */ | |
429 | len += (scsi_target_len + 4); | |
430 | } | |
431 | put_unaligned_be16(len, &buf[2]); /* Page Length for VPD 0x83 */ | |
432 | return 0; | |
433 | } | |
434 | EXPORT_SYMBOL(spc_emulate_evpd_83); | |
435 | ||
436 | /* Extended INQUIRY Data VPD Page */ | |
437 | static sense_reason_t | |
438 | spc_emulate_evpd_86(struct se_cmd *cmd, unsigned char *buf) | |
439 | { | |
440 | struct se_device *dev = cmd->se_dev; | |
441 | struct se_session *sess = cmd->se_sess; | |
442 | ||
443 | buf[3] = 0x3c; | |
444 | /* | |
445 | * Set GRD_CHK + REF_CHK for TYPE1 protection, or GRD_CHK | |
446 | * only for TYPE3 protection. | |
447 | */ | |
448 | if (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) { | |
449 | if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE1_PROT || | |
450 | cmd->se_sess->sess_prot_type == TARGET_DIF_TYPE1_PROT) | |
451 | buf[4] = 0x5; | |
452 | else if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE3_PROT || | |
453 | cmd->se_sess->sess_prot_type == TARGET_DIF_TYPE3_PROT) | |
454 | buf[4] = 0x4; | |
455 | } | |
456 | ||
457 | /* logical unit supports type 1 and type 3 protection */ | |
458 | if ((dev->transport->get_device_type(dev) == TYPE_DISK) && | |
459 | (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) && | |
460 | (dev->dev_attrib.pi_prot_type || cmd->se_sess->sess_prot_type)) { | |
461 | buf[4] |= (0x3 << 3); | |
462 | } | |
463 | ||
464 | /* Set HEADSUP, ORDSUP, SIMPSUP */ | |
465 | buf[5] = 0x07; | |
466 | ||
467 | /* If WriteCache emulation is enabled, set V_SUP */ | |
468 | if (target_check_wce(dev)) | |
469 | buf[6] = 0x01; | |
470 | /* If an LBA map is present set R_SUP */ | |
471 | spin_lock(&cmd->se_dev->t10_alua.lba_map_lock); | |
472 | if (!list_empty(&dev->t10_alua.lba_map_list)) | |
473 | buf[8] = 0x10; | |
474 | spin_unlock(&cmd->se_dev->t10_alua.lba_map_lock); | |
475 | return 0; | |
476 | } | |
477 | ||
478 | /* Block Limits VPD page */ | |
479 | static sense_reason_t | |
480 | spc_emulate_evpd_b0(struct se_cmd *cmd, unsigned char *buf) | |
481 | { | |
482 | struct se_device *dev = cmd->se_dev; | |
483 | u32 mtl = 0; | |
484 | int have_tp = 0, opt, min; | |
485 | ||
486 | /* | |
487 | * Following spc3r22 section 6.5.3 Block Limits VPD page, when | |
488 | * emulate_tpu=1 or emulate_tpws=1 we will be expect a | |
489 | * different page length for Thin Provisioning. | |
490 | */ | |
491 | if (dev->dev_attrib.emulate_tpu || dev->dev_attrib.emulate_tpws) | |
492 | have_tp = 1; | |
493 | ||
494 | buf[0] = dev->transport->get_device_type(dev); | |
495 | buf[3] = have_tp ? 0x3c : 0x10; | |
496 | ||
497 | /* Set WSNZ to 1 */ | |
498 | buf[4] = 0x01; | |
499 | /* | |
500 | * Set MAXIMUM COMPARE AND WRITE LENGTH | |
501 | */ | |
502 | if (dev->dev_attrib.emulate_caw) | |
503 | buf[5] = 0x01; | |
504 | ||
505 | /* | |
506 | * Set OPTIMAL TRANSFER LENGTH GRANULARITY | |
507 | */ | |
508 | if (dev->transport->get_io_min && (min = dev->transport->get_io_min(dev))) | |
509 | put_unaligned_be16(min / dev->dev_attrib.block_size, &buf[6]); | |
510 | else | |
511 | put_unaligned_be16(1, &buf[6]); | |
512 | ||
513 | /* | |
514 | * Set MAXIMUM TRANSFER LENGTH | |
515 | * | |
516 | * XXX: Currently assumes single PAGE_SIZE per scatterlist for fabrics | |
517 | * enforcing maximum HW scatter-gather-list entry limit | |
518 | */ | |
519 | if (cmd->se_tfo->max_data_sg_nents) { | |
520 | mtl = (cmd->se_tfo->max_data_sg_nents * PAGE_SIZE) / | |
521 | dev->dev_attrib.block_size; | |
522 | } | |
523 | put_unaligned_be32(min_not_zero(mtl, dev->dev_attrib.hw_max_sectors), &buf[8]); | |
524 | ||
525 | /* | |
526 | * Set OPTIMAL TRANSFER LENGTH | |
527 | */ | |
528 | if (dev->transport->get_io_opt && (opt = dev->transport->get_io_opt(dev))) | |
529 | put_unaligned_be32(opt / dev->dev_attrib.block_size, &buf[12]); | |
530 | else | |
531 | put_unaligned_be32(dev->dev_attrib.optimal_sectors, &buf[12]); | |
532 | ||
533 | /* | |
534 | * Exit now if we don't support TP. | |
535 | */ | |
536 | if (!have_tp) | |
537 | goto max_write_same; | |
538 | ||
539 | /* | |
540 | * Set MAXIMUM UNMAP LBA COUNT | |
541 | */ | |
542 | put_unaligned_be32(dev->dev_attrib.max_unmap_lba_count, &buf[20]); | |
543 | ||
544 | /* | |
545 | * Set MAXIMUM UNMAP BLOCK DESCRIPTOR COUNT | |
546 | */ | |
547 | put_unaligned_be32(dev->dev_attrib.max_unmap_block_desc_count, | |
548 | &buf[24]); | |
549 | ||
550 | /* | |
551 | * Set OPTIMAL UNMAP GRANULARITY | |
552 | */ | |
553 | put_unaligned_be32(dev->dev_attrib.unmap_granularity, &buf[28]); | |
554 | ||
555 | /* | |
556 | * UNMAP GRANULARITY ALIGNMENT | |
557 | */ | |
558 | put_unaligned_be32(dev->dev_attrib.unmap_granularity_alignment, | |
559 | &buf[32]); | |
560 | if (dev->dev_attrib.unmap_granularity_alignment != 0) | |
561 | buf[32] |= 0x80; /* Set the UGAVALID bit */ | |
562 | ||
563 | /* | |
564 | * MAXIMUM WRITE SAME LENGTH | |
565 | */ | |
566 | max_write_same: | |
567 | put_unaligned_be64(dev->dev_attrib.max_write_same_len, &buf[36]); | |
568 | ||
569 | return 0; | |
570 | } | |
571 | ||
572 | /* Block Device Characteristics VPD page */ | |
573 | static sense_reason_t | |
574 | spc_emulate_evpd_b1(struct se_cmd *cmd, unsigned char *buf) | |
575 | { | |
576 | struct se_device *dev = cmd->se_dev; | |
577 | ||
578 | buf[0] = dev->transport->get_device_type(dev); | |
579 | buf[3] = 0x3c; | |
580 | buf[5] = dev->dev_attrib.is_nonrot ? 1 : 0; | |
581 | ||
582 | return 0; | |
583 | } | |
584 | ||
585 | /* Thin Provisioning VPD */ | |
586 | static sense_reason_t | |
587 | spc_emulate_evpd_b2(struct se_cmd *cmd, unsigned char *buf) | |
588 | { | |
589 | struct se_device *dev = cmd->se_dev; | |
590 | ||
591 | /* | |
592 | * From spc3r22 section 6.5.4 Thin Provisioning VPD page: | |
593 | * | |
594 | * The PAGE LENGTH field is defined in SPC-4. If the DP bit is set to | |
595 | * zero, then the page length shall be set to 0004h. If the DP bit | |
596 | * is set to one, then the page length shall be set to the value | |
597 | * defined in table 162. | |
598 | */ | |
599 | buf[0] = dev->transport->get_device_type(dev); | |
600 | ||
601 | /* | |
602 | * Set Hardcoded length mentioned above for DP=0 | |
603 | */ | |
604 | put_unaligned_be16(0x0004, &buf[2]); | |
605 | ||
606 | /* | |
607 | * The THRESHOLD EXPONENT field indicates the threshold set size in | |
608 | * LBAs as a power of 2 (i.e., the threshold set size is equal to | |
609 | * 2(threshold exponent)). | |
610 | * | |
611 | * Note that this is currently set to 0x00 as mkp says it will be | |
612 | * changing again. We can enable this once it has settled in T10 | |
613 | * and is actually used by Linux/SCSI ML code. | |
614 | */ | |
615 | buf[4] = 0x00; | |
616 | ||
617 | /* | |
618 | * A TPU bit set to one indicates that the device server supports | |
619 | * the UNMAP command (see 5.25). A TPU bit set to zero indicates | |
620 | * that the device server does not support the UNMAP command. | |
621 | */ | |
622 | if (dev->dev_attrib.emulate_tpu != 0) | |
623 | buf[5] = 0x80; | |
624 | ||
625 | /* | |
626 | * A TPWS bit set to one indicates that the device server supports | |
627 | * the use of the WRITE SAME (16) command (see 5.42) to unmap LBAs. | |
628 | * A TPWS bit set to zero indicates that the device server does not | |
629 | * support the use of the WRITE SAME (16) command to unmap LBAs. | |
630 | */ | |
631 | if (dev->dev_attrib.emulate_tpws != 0) | |
632 | buf[5] |= 0x40 | 0x20; | |
633 | ||
634 | /* | |
635 | * The unmap_zeroes_data set means that the underlying device supports | |
636 | * REQ_OP_DISCARD and has the discard_zeroes_data bit set. This | |
637 | * satisfies the SBC requirements for LBPRZ, meaning that a subsequent | |
638 | * read will return zeroes after an UNMAP or WRITE SAME (16) to an LBA | |
639 | * See sbc4r36 6.6.4. | |
640 | */ | |
641 | if (((dev->dev_attrib.emulate_tpu != 0) || | |
642 | (dev->dev_attrib.emulate_tpws != 0)) && | |
643 | (dev->dev_attrib.unmap_zeroes_data != 0)) | |
644 | buf[5] |= 0x04; | |
645 | ||
646 | return 0; | |
647 | } | |
648 | ||
649 | /* Referrals VPD page */ | |
650 | static sense_reason_t | |
651 | spc_emulate_evpd_b3(struct se_cmd *cmd, unsigned char *buf) | |
652 | { | |
653 | struct se_device *dev = cmd->se_dev; | |
654 | ||
655 | buf[0] = dev->transport->get_device_type(dev); | |
656 | buf[3] = 0x0c; | |
657 | put_unaligned_be32(dev->t10_alua.lba_map_segment_size, &buf[8]); | |
658 | put_unaligned_be32(dev->t10_alua.lba_map_segment_multiplier, &buf[12]); | |
659 | ||
660 | return 0; | |
661 | } | |
662 | ||
663 | static sense_reason_t | |
664 | spc_emulate_evpd_00(struct se_cmd *cmd, unsigned char *buf); | |
665 | ||
666 | static struct { | |
667 | uint8_t page; | |
668 | sense_reason_t (*emulate)(struct se_cmd *, unsigned char *); | |
669 | } evpd_handlers[] = { | |
670 | { .page = 0x00, .emulate = spc_emulate_evpd_00 }, | |
671 | { .page = 0x80, .emulate = spc_emulate_evpd_80 }, | |
672 | { .page = 0x83, .emulate = spc_emulate_evpd_83 }, | |
673 | { .page = 0x86, .emulate = spc_emulate_evpd_86 }, | |
674 | { .page = 0xb0, .emulate = spc_emulate_evpd_b0 }, | |
675 | { .page = 0xb1, .emulate = spc_emulate_evpd_b1 }, | |
676 | { .page = 0xb2, .emulate = spc_emulate_evpd_b2 }, | |
677 | { .page = 0xb3, .emulate = spc_emulate_evpd_b3 }, | |
678 | }; | |
679 | ||
680 | /* supported vital product data pages */ | |
681 | static sense_reason_t | |
682 | spc_emulate_evpd_00(struct se_cmd *cmd, unsigned char *buf) | |
683 | { | |
684 | int p; | |
685 | ||
686 | /* | |
687 | * Only report the INQUIRY EVPD=1 pages after a valid NAA | |
688 | * Registered Extended LUN WWN has been set via ConfigFS | |
689 | * during device creation/restart. | |
690 | */ | |
691 | if (cmd->se_dev->dev_flags & DF_EMULATED_VPD_UNIT_SERIAL) { | |
692 | buf[3] = ARRAY_SIZE(evpd_handlers); | |
693 | for (p = 0; p < ARRAY_SIZE(evpd_handlers); ++p) | |
694 | buf[p + 4] = evpd_handlers[p].page; | |
695 | } | |
696 | ||
697 | return 0; | |
698 | } | |
699 | ||
700 | static sense_reason_t | |
701 | spc_emulate_inquiry(struct se_cmd *cmd) | |
702 | { | |
703 | struct se_device *dev = cmd->se_dev; | |
704 | struct se_portal_group *tpg = cmd->se_lun->lun_tpg; | |
705 | unsigned char *rbuf; | |
706 | unsigned char *cdb = cmd->t_task_cdb; | |
707 | unsigned char *buf; | |
708 | sense_reason_t ret; | |
709 | int p; | |
710 | int len = 0; | |
711 | ||
712 | buf = kzalloc(SE_INQUIRY_BUF, GFP_KERNEL); | |
713 | if (!buf) { | |
714 | pr_err("Unable to allocate response buffer for INQUIRY\n"); | |
715 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
716 | } | |
717 | ||
718 | if (dev == rcu_access_pointer(tpg->tpg_virt_lun0->lun_se_dev)) | |
719 | buf[0] = 0x3f; /* Not connected */ | |
720 | else | |
721 | buf[0] = dev->transport->get_device_type(dev); | |
722 | ||
723 | if (!(cdb[1] & 0x1)) { | |
724 | if (cdb[2]) { | |
725 | pr_err("INQUIRY with EVPD==0 but PAGE CODE=%02x\n", | |
726 | cdb[2]); | |
727 | ret = TCM_INVALID_CDB_FIELD; | |
728 | goto out; | |
729 | } | |
730 | ||
731 | ret = spc_emulate_inquiry_std(cmd, buf); | |
732 | len = buf[4] + 5; | |
733 | goto out; | |
734 | } | |
735 | ||
736 | for (p = 0; p < ARRAY_SIZE(evpd_handlers); ++p) { | |
737 | if (cdb[2] == evpd_handlers[p].page) { | |
738 | buf[1] = cdb[2]; | |
739 | ret = evpd_handlers[p].emulate(cmd, buf); | |
740 | len = get_unaligned_be16(&buf[2]) + 4; | |
741 | goto out; | |
742 | } | |
743 | } | |
744 | ||
745 | pr_err("Unknown VPD Code: 0x%02x\n", cdb[2]); | |
746 | ret = TCM_INVALID_CDB_FIELD; | |
747 | ||
748 | out: | |
749 | rbuf = transport_kmap_data_sg(cmd); | |
750 | if (rbuf) { | |
751 | memcpy(rbuf, buf, min_t(u32, SE_INQUIRY_BUF, cmd->data_length)); | |
752 | transport_kunmap_data_sg(cmd); | |
753 | } | |
754 | kfree(buf); | |
755 | ||
756 | if (!ret) | |
757 | target_complete_cmd_with_length(cmd, GOOD, len); | |
758 | return ret; | |
759 | } | |
760 | ||
761 | static int spc_modesense_rwrecovery(struct se_cmd *cmd, u8 pc, u8 *p) | |
762 | { | |
763 | p[0] = 0x01; | |
764 | p[1] = 0x0a; | |
765 | ||
766 | /* No changeable values for now */ | |
767 | if (pc == 1) | |
768 | goto out; | |
769 | ||
770 | out: | |
771 | return 12; | |
772 | } | |
773 | ||
774 | static int spc_modesense_control(struct se_cmd *cmd, u8 pc, u8 *p) | |
775 | { | |
776 | struct se_device *dev = cmd->se_dev; | |
777 | struct se_session *sess = cmd->se_sess; | |
778 | ||
779 | p[0] = 0x0a; | |
780 | p[1] = 0x0a; | |
781 | ||
782 | /* No changeable values for now */ | |
783 | if (pc == 1) | |
784 | goto out; | |
785 | ||
786 | /* GLTSD: No implicit save of log parameters */ | |
787 | p[2] = (1 << 1); | |
788 | if (target_sense_desc_format(dev)) | |
789 | /* D_SENSE: Descriptor format sense data for 64bit sectors */ | |
790 | p[2] |= (1 << 2); | |
791 | ||
792 | /* | |
793 | * From spc4r23, 7.4.7 Control mode page | |
794 | * | |
795 | * The QUEUE ALGORITHM MODIFIER field (see table 368) specifies | |
796 | * restrictions on the algorithm used for reordering commands | |
797 | * having the SIMPLE task attribute (see SAM-4). | |
798 | * | |
799 | * Table 368 -- QUEUE ALGORITHM MODIFIER field | |
800 | * Code Description | |
801 | * 0h Restricted reordering | |
802 | * 1h Unrestricted reordering allowed | |
803 | * 2h to 7h Reserved | |
804 | * 8h to Fh Vendor specific | |
805 | * | |
806 | * A value of zero in the QUEUE ALGORITHM MODIFIER field specifies that | |
807 | * the device server shall order the processing sequence of commands | |
808 | * having the SIMPLE task attribute such that data integrity is maintained | |
809 | * for that I_T nexus (i.e., if the transmission of new SCSI transport protocol | |
810 | * requests is halted at any time, the final value of all data observable | |
811 | * on the medium shall be the same as if all the commands had been processed | |
812 | * with the ORDERED task attribute). | |
813 | * | |
814 | * A value of one in the QUEUE ALGORITHM MODIFIER field specifies that the | |
815 | * device server may reorder the processing sequence of commands having the | |
816 | * SIMPLE task attribute in any manner. Any data integrity exposures related to | |
817 | * command sequence order shall be explicitly handled by the application client | |
818 | * through the selection of appropriate ommands and task attributes. | |
819 | */ | |
820 | p[3] = (dev->dev_attrib.emulate_rest_reord == 1) ? 0x00 : 0x10; | |
821 | /* | |
822 | * From spc4r17, section 7.4.6 Control mode Page | |
823 | * | |
824 | * Unit Attention interlocks control (UN_INTLCK_CTRL) to code 00b | |
825 | * | |
826 | * 00b: The logical unit shall clear any unit attention condition | |
827 | * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION | |
828 | * status and shall not establish a unit attention condition when a com- | |
829 | * mand is completed with BUSY, TASK SET FULL, or RESERVATION CONFLICT | |
830 | * status. | |
831 | * | |
832 | * 10b: The logical unit shall not clear any unit attention condition | |
833 | * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION | |
834 | * status and shall not establish a unit attention condition when | |
835 | * a command is completed with BUSY, TASK SET FULL, or RESERVATION | |
836 | * CONFLICT status. | |
837 | * | |
838 | * 11b a The logical unit shall not clear any unit attention condition | |
839 | * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION | |
840 | * status and shall establish a unit attention condition for the | |
841 | * initiator port associated with the I_T nexus on which the BUSY, | |
842 | * TASK SET FULL, or RESERVATION CONFLICT status is being returned. | |
843 | * Depending on the status, the additional sense code shall be set to | |
844 | * PREVIOUS BUSY STATUS, PREVIOUS TASK SET FULL STATUS, or PREVIOUS | |
845 | * RESERVATION CONFLICT STATUS. Until it is cleared by a REQUEST SENSE | |
846 | * command, a unit attention condition shall be established only once | |
847 | * for a BUSY, TASK SET FULL, or RESERVATION CONFLICT status regardless | |
848 | * to the number of commands completed with one of those status codes. | |
849 | */ | |
850 | switch (dev->dev_attrib.emulate_ua_intlck_ctrl) { | |
851 | case TARGET_UA_INTLCK_CTRL_ESTABLISH_UA: | |
852 | p[4] = 0x30; | |
853 | break; | |
854 | case TARGET_UA_INTLCK_CTRL_NO_CLEAR: | |
855 | p[4] = 0x20; | |
856 | break; | |
857 | default: /* TARGET_UA_INTLCK_CTRL_CLEAR */ | |
858 | p[4] = 0x00; | |
859 | break; | |
860 | } | |
861 | /* | |
862 | * From spc4r17, section 7.4.6 Control mode Page | |
863 | * | |
864 | * Task Aborted Status (TAS) bit set to zero. | |
865 | * | |
866 | * A task aborted status (TAS) bit set to zero specifies that aborted | |
867 | * tasks shall be terminated by the device server without any response | |
868 | * to the application client. A TAS bit set to one specifies that tasks | |
869 | * aborted by the actions of an I_T nexus other than the I_T nexus on | |
870 | * which the command was received shall be completed with TASK ABORTED | |
871 | * status (see SAM-4). | |
872 | */ | |
873 | p[5] = (dev->dev_attrib.emulate_tas) ? 0x40 : 0x00; | |
874 | /* | |
875 | * From spc4r30, section 7.5.7 Control mode page | |
876 | * | |
877 | * Application Tag Owner (ATO) bit set to one. | |
878 | * | |
879 | * If the ATO bit is set to one the device server shall not modify the | |
880 | * LOGICAL BLOCK APPLICATION TAG field and, depending on the protection | |
881 | * type, shall not modify the contents of the LOGICAL BLOCK REFERENCE | |
882 | * TAG field. | |
883 | */ | |
884 | if (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) { | |
885 | if (dev->dev_attrib.pi_prot_type || sess->sess_prot_type) | |
886 | p[5] |= 0x80; | |
887 | } | |
888 | ||
889 | p[8] = 0xff; | |
890 | p[9] = 0xff; | |
891 | p[11] = 30; | |
892 | ||
893 | out: | |
894 | return 12; | |
895 | } | |
896 | ||
897 | static int spc_modesense_caching(struct se_cmd *cmd, u8 pc, u8 *p) | |
898 | { | |
899 | struct se_device *dev = cmd->se_dev; | |
900 | ||
901 | p[0] = 0x08; | |
902 | p[1] = 0x12; | |
903 | ||
904 | /* No changeable values for now */ | |
905 | if (pc == 1) | |
906 | goto out; | |
907 | ||
908 | if (target_check_wce(dev)) | |
909 | p[2] = 0x04; /* Write Cache Enable */ | |
910 | p[12] = 0x20; /* Disabled Read Ahead */ | |
911 | ||
912 | out: | |
913 | return 20; | |
914 | } | |
915 | ||
916 | static int spc_modesense_informational_exceptions(struct se_cmd *cmd, u8 pc, unsigned char *p) | |
917 | { | |
918 | p[0] = 0x1c; | |
919 | p[1] = 0x0a; | |
920 | ||
921 | /* No changeable values for now */ | |
922 | if (pc == 1) | |
923 | goto out; | |
924 | ||
925 | out: | |
926 | return 12; | |
927 | } | |
928 | ||
929 | static struct { | |
930 | uint8_t page; | |
931 | uint8_t subpage; | |
932 | int (*emulate)(struct se_cmd *, u8, unsigned char *); | |
933 | } modesense_handlers[] = { | |
934 | { .page = 0x01, .subpage = 0x00, .emulate = spc_modesense_rwrecovery }, | |
935 | { .page = 0x08, .subpage = 0x00, .emulate = spc_modesense_caching }, | |
936 | { .page = 0x0a, .subpage = 0x00, .emulate = spc_modesense_control }, | |
937 | { .page = 0x1c, .subpage = 0x00, .emulate = spc_modesense_informational_exceptions }, | |
938 | }; | |
939 | ||
940 | static void spc_modesense_write_protect(unsigned char *buf, int type) | |
941 | { | |
942 | /* | |
943 | * I believe that the WP bit (bit 7) in the mode header is the same for | |
944 | * all device types.. | |
945 | */ | |
946 | switch (type) { | |
947 | case TYPE_DISK: | |
948 | case TYPE_TAPE: | |
949 | default: | |
950 | buf[0] |= 0x80; /* WP bit */ | |
951 | break; | |
952 | } | |
953 | } | |
954 | ||
955 | static void spc_modesense_dpofua(unsigned char *buf, int type) | |
956 | { | |
957 | switch (type) { | |
958 | case TYPE_DISK: | |
959 | buf[0] |= 0x10; /* DPOFUA bit */ | |
960 | break; | |
961 | default: | |
962 | break; | |
963 | } | |
964 | } | |
965 | ||
966 | static int spc_modesense_blockdesc(unsigned char *buf, u64 blocks, u32 block_size) | |
967 | { | |
968 | *buf++ = 8; | |
969 | put_unaligned_be32(min(blocks, 0xffffffffull), buf); | |
970 | buf += 4; | |
971 | put_unaligned_be32(block_size, buf); | |
972 | return 9; | |
973 | } | |
974 | ||
975 | static int spc_modesense_long_blockdesc(unsigned char *buf, u64 blocks, u32 block_size) | |
976 | { | |
977 | if (blocks <= 0xffffffff) | |
978 | return spc_modesense_blockdesc(buf + 3, blocks, block_size) + 3; | |
979 | ||
980 | *buf++ = 1; /* LONGLBA */ | |
981 | buf += 2; | |
982 | *buf++ = 16; | |
983 | put_unaligned_be64(blocks, buf); | |
984 | buf += 12; | |
985 | put_unaligned_be32(block_size, buf); | |
986 | ||
987 | return 17; | |
988 | } | |
989 | ||
990 | static sense_reason_t spc_emulate_modesense(struct se_cmd *cmd) | |
991 | { | |
992 | struct se_device *dev = cmd->se_dev; | |
993 | char *cdb = cmd->t_task_cdb; | |
994 | unsigned char buf[SE_MODE_PAGE_BUF], *rbuf; | |
995 | int type = dev->transport->get_device_type(dev); | |
996 | int ten = (cmd->t_task_cdb[0] == MODE_SENSE_10); | |
997 | bool dbd = !!(cdb[1] & 0x08); | |
998 | bool llba = ten ? !!(cdb[1] & 0x10) : false; | |
999 | u8 pc = cdb[2] >> 6; | |
1000 | u8 page = cdb[2] & 0x3f; | |
1001 | u8 subpage = cdb[3]; | |
1002 | int length = 0; | |
1003 | int ret; | |
1004 | int i; | |
1005 | ||
1006 | memset(buf, 0, SE_MODE_PAGE_BUF); | |
1007 | ||
1008 | /* | |
1009 | * Skip over MODE DATA LENGTH + MEDIUM TYPE fields to byte 3 for | |
1010 | * MODE_SENSE_10 and byte 2 for MODE_SENSE (6). | |
1011 | */ | |
1012 | length = ten ? 3 : 2; | |
1013 | ||
1014 | /* DEVICE-SPECIFIC PARAMETER */ | |
1015 | if (cmd->se_lun->lun_access_ro || target_lun_is_rdonly(cmd)) | |
1016 | spc_modesense_write_protect(&buf[length], type); | |
1017 | ||
1018 | /* | |
1019 | * SBC only allows us to enable FUA and DPO together. Fortunately | |
1020 | * DPO is explicitly specified as a hint, so a noop is a perfectly | |
1021 | * valid implementation. | |
1022 | */ | |
1023 | if (target_check_fua(dev)) | |
1024 | spc_modesense_dpofua(&buf[length], type); | |
1025 | ||
1026 | ++length; | |
1027 | ||
1028 | /* BLOCK DESCRIPTOR */ | |
1029 | ||
1030 | /* | |
1031 | * For now we only include a block descriptor for disk (SBC) | |
1032 | * devices; other command sets use a slightly different format. | |
1033 | */ | |
1034 | if (!dbd && type == TYPE_DISK) { | |
1035 | u64 blocks = dev->transport->get_blocks(dev); | |
1036 | u32 block_size = dev->dev_attrib.block_size; | |
1037 | ||
1038 | if (ten) { | |
1039 | if (llba) { | |
1040 | length += spc_modesense_long_blockdesc(&buf[length], | |
1041 | blocks, block_size); | |
1042 | } else { | |
1043 | length += 3; | |
1044 | length += spc_modesense_blockdesc(&buf[length], | |
1045 | blocks, block_size); | |
1046 | } | |
1047 | } else { | |
1048 | length += spc_modesense_blockdesc(&buf[length], blocks, | |
1049 | block_size); | |
1050 | } | |
1051 | } else { | |
1052 | if (ten) | |
1053 | length += 4; | |
1054 | else | |
1055 | length += 1; | |
1056 | } | |
1057 | ||
1058 | if (page == 0x3f) { | |
1059 | if (subpage != 0x00 && subpage != 0xff) { | |
1060 | pr_warn("MODE_SENSE: Invalid subpage code: 0x%02x\n", subpage); | |
1061 | return TCM_INVALID_CDB_FIELD; | |
1062 | } | |
1063 | ||
1064 | for (i = 0; i < ARRAY_SIZE(modesense_handlers); ++i) { | |
1065 | /* | |
1066 | * Tricky way to say all subpage 00h for | |
1067 | * subpage==0, all subpages for subpage==0xff | |
1068 | * (and we just checked above that those are | |
1069 | * the only two possibilities). | |
1070 | */ | |
1071 | if ((modesense_handlers[i].subpage & ~subpage) == 0) { | |
1072 | ret = modesense_handlers[i].emulate(cmd, pc, &buf[length]); | |
1073 | if (!ten && length + ret >= 255) | |
1074 | break; | |
1075 | length += ret; | |
1076 | } | |
1077 | } | |
1078 | ||
1079 | goto set_length; | |
1080 | } | |
1081 | ||
1082 | for (i = 0; i < ARRAY_SIZE(modesense_handlers); ++i) | |
1083 | if (modesense_handlers[i].page == page && | |
1084 | modesense_handlers[i].subpage == subpage) { | |
1085 | length += modesense_handlers[i].emulate(cmd, pc, &buf[length]); | |
1086 | goto set_length; | |
1087 | } | |
1088 | ||
1089 | /* | |
1090 | * We don't intend to implement: | |
1091 | * - obsolete page 03h "format parameters" (checked by Solaris) | |
1092 | */ | |
1093 | if (page != 0x03) | |
1094 | pr_err("MODE SENSE: unimplemented page/subpage: 0x%02x/0x%02x\n", | |
1095 | page, subpage); | |
1096 | ||
1097 | return TCM_UNKNOWN_MODE_PAGE; | |
1098 | ||
1099 | set_length: | |
1100 | if (ten) | |
1101 | put_unaligned_be16(length - 2, buf); | |
1102 | else | |
1103 | buf[0] = length - 1; | |
1104 | ||
1105 | rbuf = transport_kmap_data_sg(cmd); | |
1106 | if (rbuf) { | |
1107 | memcpy(rbuf, buf, min_t(u32, SE_MODE_PAGE_BUF, cmd->data_length)); | |
1108 | transport_kunmap_data_sg(cmd); | |
1109 | } | |
1110 | ||
1111 | target_complete_cmd_with_length(cmd, GOOD, length); | |
1112 | return 0; | |
1113 | } | |
1114 | ||
1115 | static sense_reason_t spc_emulate_modeselect(struct se_cmd *cmd) | |
1116 | { | |
1117 | char *cdb = cmd->t_task_cdb; | |
1118 | bool ten = cdb[0] == MODE_SELECT_10; | |
1119 | int off = ten ? 8 : 4; | |
1120 | bool pf = !!(cdb[1] & 0x10); | |
1121 | u8 page, subpage; | |
1122 | unsigned char *buf; | |
1123 | unsigned char tbuf[SE_MODE_PAGE_BUF]; | |
1124 | int length; | |
1125 | sense_reason_t ret = 0; | |
1126 | int i; | |
1127 | ||
1128 | if (!cmd->data_length) { | |
1129 | target_complete_cmd(cmd, GOOD); | |
1130 | return 0; | |
1131 | } | |
1132 | ||
1133 | if (cmd->data_length < off + 2) | |
1134 | return TCM_PARAMETER_LIST_LENGTH_ERROR; | |
1135 | ||
1136 | buf = transport_kmap_data_sg(cmd); | |
1137 | if (!buf) | |
1138 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
1139 | ||
1140 | if (!pf) { | |
1141 | ret = TCM_INVALID_CDB_FIELD; | |
1142 | goto out; | |
1143 | } | |
1144 | ||
1145 | page = buf[off] & 0x3f; | |
1146 | subpage = buf[off] & 0x40 ? buf[off + 1] : 0; | |
1147 | ||
1148 | for (i = 0; i < ARRAY_SIZE(modesense_handlers); ++i) | |
1149 | if (modesense_handlers[i].page == page && | |
1150 | modesense_handlers[i].subpage == subpage) { | |
1151 | memset(tbuf, 0, SE_MODE_PAGE_BUF); | |
1152 | length = modesense_handlers[i].emulate(cmd, 0, tbuf); | |
1153 | goto check_contents; | |
1154 | } | |
1155 | ||
1156 | ret = TCM_UNKNOWN_MODE_PAGE; | |
1157 | goto out; | |
1158 | ||
1159 | check_contents: | |
1160 | if (cmd->data_length < off + length) { | |
1161 | ret = TCM_PARAMETER_LIST_LENGTH_ERROR; | |
1162 | goto out; | |
1163 | } | |
1164 | ||
1165 | if (memcmp(buf + off, tbuf, length)) | |
1166 | ret = TCM_INVALID_PARAMETER_LIST; | |
1167 | ||
1168 | out: | |
1169 | transport_kunmap_data_sg(cmd); | |
1170 | ||
1171 | if (!ret) | |
1172 | target_complete_cmd(cmd, GOOD); | |
1173 | return ret; | |
1174 | } | |
1175 | ||
1176 | static sense_reason_t spc_emulate_request_sense(struct se_cmd *cmd) | |
1177 | { | |
1178 | unsigned char *cdb = cmd->t_task_cdb; | |
1179 | unsigned char *rbuf; | |
1180 | u8 ua_asc = 0, ua_ascq = 0; | |
1181 | unsigned char buf[SE_SENSE_BUF]; | |
1182 | bool desc_format = target_sense_desc_format(cmd->se_dev); | |
1183 | ||
1184 | memset(buf, 0, SE_SENSE_BUF); | |
1185 | ||
1186 | if (cdb[1] & 0x01) { | |
1187 | pr_err("REQUEST_SENSE description emulation not" | |
1188 | " supported\n"); | |
1189 | return TCM_INVALID_CDB_FIELD; | |
1190 | } | |
1191 | ||
1192 | rbuf = transport_kmap_data_sg(cmd); | |
1193 | if (!rbuf) | |
1194 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
1195 | ||
1196 | if (!core_scsi3_ua_clear_for_request_sense(cmd, &ua_asc, &ua_ascq)) | |
1197 | scsi_build_sense_buffer(desc_format, buf, UNIT_ATTENTION, | |
1198 | ua_asc, ua_ascq); | |
1199 | else | |
1200 | scsi_build_sense_buffer(desc_format, buf, NO_SENSE, 0x0, 0x0); | |
1201 | ||
1202 | memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length)); | |
1203 | transport_kunmap_data_sg(cmd); | |
1204 | ||
1205 | target_complete_cmd(cmd, GOOD); | |
1206 | return 0; | |
1207 | } | |
1208 | ||
1209 | sense_reason_t spc_emulate_report_luns(struct se_cmd *cmd) | |
1210 | { | |
1211 | struct se_dev_entry *deve; | |
1212 | struct se_session *sess = cmd->se_sess; | |
1213 | struct se_node_acl *nacl; | |
1214 | struct scsi_lun slun; | |
1215 | unsigned char *buf; | |
1216 | u32 lun_count = 0, offset = 8; | |
1217 | __be32 len; | |
1218 | ||
1219 | buf = transport_kmap_data_sg(cmd); | |
1220 | if (cmd->data_length && !buf) | |
1221 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
1222 | ||
1223 | /* | |
1224 | * If no struct se_session pointer is present, this struct se_cmd is | |
1225 | * coming via a target_core_mod PASSTHROUGH op, and not through | |
1226 | * a $FABRIC_MOD. In that case, report LUN=0 only. | |
1227 | */ | |
1228 | if (!sess) | |
1229 | goto done; | |
1230 | ||
1231 | nacl = sess->se_node_acl; | |
1232 | ||
1233 | rcu_read_lock(); | |
1234 | hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) { | |
1235 | /* | |
1236 | * We determine the correct LUN LIST LENGTH even once we | |
1237 | * have reached the initial allocation length. | |
1238 | * See SPC2-R20 7.19. | |
1239 | */ | |
1240 | lun_count++; | |
1241 | if (offset >= cmd->data_length) | |
1242 | continue; | |
1243 | ||
1244 | int_to_scsilun(deve->mapped_lun, &slun); | |
1245 | memcpy(buf + offset, &slun, | |
1246 | min(8u, cmd->data_length - offset)); | |
1247 | offset += 8; | |
1248 | } | |
1249 | rcu_read_unlock(); | |
1250 | ||
1251 | /* | |
1252 | * See SPC3 r07, page 159. | |
1253 | */ | |
1254 | done: | |
1255 | /* | |
1256 | * If no LUNs are accessible, report virtual LUN 0. | |
1257 | */ | |
1258 | if (lun_count == 0) { | |
1259 | int_to_scsilun(0, &slun); | |
1260 | if (cmd->data_length > 8) | |
1261 | memcpy(buf + offset, &slun, | |
1262 | min(8u, cmd->data_length - offset)); | |
1263 | lun_count = 1; | |
1264 | } | |
1265 | ||
1266 | if (buf) { | |
1267 | len = cpu_to_be32(lun_count * 8); | |
1268 | memcpy(buf, &len, min_t(int, sizeof len, cmd->data_length)); | |
1269 | transport_kunmap_data_sg(cmd); | |
1270 | } | |
1271 | ||
1272 | target_complete_cmd_with_length(cmd, GOOD, 8 + lun_count * 8); | |
1273 | return 0; | |
1274 | } | |
1275 | EXPORT_SYMBOL(spc_emulate_report_luns); | |
1276 | ||
1277 | static sense_reason_t | |
1278 | spc_emulate_testunitready(struct se_cmd *cmd) | |
1279 | { | |
1280 | target_complete_cmd(cmd, GOOD); | |
1281 | return 0; | |
1282 | } | |
1283 | ||
1284 | sense_reason_t | |
1285 | spc_parse_cdb(struct se_cmd *cmd, unsigned int *size) | |
1286 | { | |
1287 | struct se_device *dev = cmd->se_dev; | |
1288 | unsigned char *cdb = cmd->t_task_cdb; | |
1289 | ||
1290 | if (!dev->dev_attrib.emulate_pr && | |
1291 | ((cdb[0] == PERSISTENT_RESERVE_IN) || | |
1292 | (cdb[0] == PERSISTENT_RESERVE_OUT) || | |
1293 | (cdb[0] == RELEASE || cdb[0] == RELEASE_10) || | |
1294 | (cdb[0] == RESERVE || cdb[0] == RESERVE_10))) { | |
1295 | return TCM_UNSUPPORTED_SCSI_OPCODE; | |
1296 | } | |
1297 | ||
1298 | switch (cdb[0]) { | |
1299 | case MODE_SELECT: | |
1300 | *size = cdb[4]; | |
1301 | cmd->execute_cmd = spc_emulate_modeselect; | |
1302 | break; | |
1303 | case MODE_SELECT_10: | |
1304 | *size = get_unaligned_be16(&cdb[7]); | |
1305 | cmd->execute_cmd = spc_emulate_modeselect; | |
1306 | break; | |
1307 | case MODE_SENSE: | |
1308 | *size = cdb[4]; | |
1309 | cmd->execute_cmd = spc_emulate_modesense; | |
1310 | break; | |
1311 | case MODE_SENSE_10: | |
1312 | *size = get_unaligned_be16(&cdb[7]); | |
1313 | cmd->execute_cmd = spc_emulate_modesense; | |
1314 | break; | |
1315 | case LOG_SELECT: | |
1316 | case LOG_SENSE: | |
1317 | *size = get_unaligned_be16(&cdb[7]); | |
1318 | break; | |
1319 | case PERSISTENT_RESERVE_IN: | |
1320 | *size = get_unaligned_be16(&cdb[7]); | |
1321 | cmd->execute_cmd = target_scsi3_emulate_pr_in; | |
1322 | break; | |
1323 | case PERSISTENT_RESERVE_OUT: | |
1324 | *size = get_unaligned_be32(&cdb[5]); | |
1325 | cmd->execute_cmd = target_scsi3_emulate_pr_out; | |
1326 | break; | |
1327 | case RELEASE: | |
1328 | case RELEASE_10: | |
1329 | if (cdb[0] == RELEASE_10) | |
1330 | *size = get_unaligned_be16(&cdb[7]); | |
1331 | else | |
1332 | *size = cmd->data_length; | |
1333 | ||
1334 | cmd->execute_cmd = target_scsi2_reservation_release; | |
1335 | break; | |
1336 | case RESERVE: | |
1337 | case RESERVE_10: | |
1338 | /* | |
1339 | * The SPC-2 RESERVE does not contain a size in the SCSI CDB. | |
1340 | * Assume the passthrough or $FABRIC_MOD will tell us about it. | |
1341 | */ | |
1342 | if (cdb[0] == RESERVE_10) | |
1343 | *size = get_unaligned_be16(&cdb[7]); | |
1344 | else | |
1345 | *size = cmd->data_length; | |
1346 | ||
1347 | cmd->execute_cmd = target_scsi2_reservation_reserve; | |
1348 | break; | |
1349 | case REQUEST_SENSE: | |
1350 | *size = cdb[4]; | |
1351 | cmd->execute_cmd = spc_emulate_request_sense; | |
1352 | break; | |
1353 | case INQUIRY: | |
1354 | *size = get_unaligned_be16(&cdb[3]); | |
1355 | ||
1356 | /* | |
1357 | * Do implicit HEAD_OF_QUEUE processing for INQUIRY. | |
1358 | * See spc4r17 section 5.3 | |
1359 | */ | |
1360 | cmd->sam_task_attr = TCM_HEAD_TAG; | |
1361 | cmd->execute_cmd = spc_emulate_inquiry; | |
1362 | break; | |
1363 | case SECURITY_PROTOCOL_IN: | |
1364 | case SECURITY_PROTOCOL_OUT: | |
1365 | *size = get_unaligned_be32(&cdb[6]); | |
1366 | break; | |
1367 | case EXTENDED_COPY: | |
1368 | *size = get_unaligned_be32(&cdb[10]); | |
1369 | cmd->execute_cmd = target_do_xcopy; | |
1370 | break; | |
1371 | case RECEIVE_COPY_RESULTS: | |
1372 | *size = get_unaligned_be32(&cdb[10]); | |
1373 | cmd->execute_cmd = target_do_receive_copy_results; | |
1374 | break; | |
1375 | case READ_ATTRIBUTE: | |
1376 | case WRITE_ATTRIBUTE: | |
1377 | *size = get_unaligned_be32(&cdb[10]); | |
1378 | break; | |
1379 | case RECEIVE_DIAGNOSTIC: | |
1380 | case SEND_DIAGNOSTIC: | |
1381 | *size = get_unaligned_be16(&cdb[3]); | |
1382 | break; | |
1383 | case WRITE_BUFFER: | |
1384 | *size = get_unaligned_be24(&cdb[6]); | |
1385 | break; | |
1386 | case REPORT_LUNS: | |
1387 | cmd->execute_cmd = spc_emulate_report_luns; | |
1388 | *size = get_unaligned_be32(&cdb[6]); | |
1389 | /* | |
1390 | * Do implicit HEAD_OF_QUEUE processing for REPORT_LUNS | |
1391 | * See spc4r17 section 5.3 | |
1392 | */ | |
1393 | cmd->sam_task_attr = TCM_HEAD_TAG; | |
1394 | break; | |
1395 | case TEST_UNIT_READY: | |
1396 | cmd->execute_cmd = spc_emulate_testunitready; | |
1397 | *size = 0; | |
1398 | break; | |
1399 | case MAINTENANCE_IN: | |
1400 | if (dev->transport->get_device_type(dev) != TYPE_ROM) { | |
1401 | /* | |
1402 | * MAINTENANCE_IN from SCC-2 | |
1403 | * Check for emulated MI_REPORT_TARGET_PGS | |
1404 | */ | |
1405 | if ((cdb[1] & 0x1f) == MI_REPORT_TARGET_PGS) { | |
1406 | cmd->execute_cmd = | |
1407 | target_emulate_report_target_port_groups; | |
1408 | } | |
1409 | *size = get_unaligned_be32(&cdb[6]); | |
1410 | } else { | |
1411 | /* | |
1412 | * GPCMD_SEND_KEY from multi media commands | |
1413 | */ | |
1414 | *size = get_unaligned_be16(&cdb[8]); | |
1415 | } | |
1416 | break; | |
1417 | case MAINTENANCE_OUT: | |
1418 | if (dev->transport->get_device_type(dev) != TYPE_ROM) { | |
1419 | /* | |
1420 | * MAINTENANCE_OUT from SCC-2 | |
1421 | * Check for emulated MO_SET_TARGET_PGS. | |
1422 | */ | |
1423 | if (cdb[1] == MO_SET_TARGET_PGS) { | |
1424 | cmd->execute_cmd = | |
1425 | target_emulate_set_target_port_groups; | |
1426 | } | |
1427 | *size = get_unaligned_be32(&cdb[6]); | |
1428 | } else { | |
1429 | /* | |
1430 | * GPCMD_SEND_KEY from multi media commands | |
1431 | */ | |
1432 | *size = get_unaligned_be16(&cdb[8]); | |
1433 | } | |
1434 | break; | |
1435 | default: | |
1436 | return TCM_UNSUPPORTED_SCSI_OPCODE; | |
1437 | } | |
1438 | ||
1439 | return 0; | |
1440 | } | |
1441 | EXPORT_SYMBOL(spc_parse_cdb); |