1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * RFC 3720 (iSCSI) protocol data types
4 *
5 * Copyright (C) 2005 Dmitry Yusupov
6 * Copyright (C) 2005 Alex Aizman
7 * maintained by open-iscsi@googlegroups.com
8 */
9
10#ifndef ISCSI_PROTO_H
11#define ISCSI_PROTO_H
12
13#include <linux/types.h>
14#include <scsi/scsi.h>
15
16#define ISCSI_DRAFT20_VERSION 0x00
17
18/* default iSCSI listen port for incoming connections */
19#define ISCSI_LISTEN_PORT 3260
20
21/* iSCSI header length */
22#define ISCSI_HDR_LEN 48
23
24/* iSCSI CRC32C length */
25#define ISCSI_CRC_LEN 4
26
27/* Padding word length */
28#define ISCSI_PAD_LEN 4
29
30/*
31 * Serial Number Arithmetic, 32 bits, RFC1982
32 */
33
34static inline int iscsi_sna_lt(u32 n1, u32 n2)
35{
36 return (s32)(n1 - n2) < 0;
37}
38
39static inline int iscsi_sna_lte(u32 n1, u32 n2)
40{
41 return (s32)(n1 - n2) <= 0;
42}
43
44static inline int iscsi_sna_gt(u32 n1, u32 n2)
45{
46 return (s32)(n1 - n2) > 0;
47}
48
49static inline int iscsi_sna_gte(u32 n1, u32 n2)
50{
51 return (s32)(n1 - n2) >= 0;
52}
53
54/*
55 * useful common(control and data paths) macro
56 */
57#define ntoh24(p) (((p)[0] << 16) | ((p)[1] << 8) | ((p)[2]))
58#define hton24(p, v) { \
59 p[0] = (((v) >> 16) & 0xFF); \
60 p[1] = (((v) >> 8) & 0xFF); \
61 p[2] = ((v) & 0xFF); \
62}
63#define zero_data(p) {p[0]=0;p[1]=0;p[2]=0;}
64
65/* initiator tags; opaque for target */
66typedef uint32_t __bitwise itt_t;
67/* below makes sense only for initiator that created this tag */
68#define build_itt(itt, age) ((__force itt_t)\
69 ((itt) | ((age) << ISCSI_AGE_SHIFT)))
70#define get_itt(itt) ((__force uint32_t)(itt_t)(itt) & ISCSI_ITT_MASK)
71#define RESERVED_ITT ((__force itt_t)0xffffffff)
72
73/*
74 * iSCSI Template Message Header
75 */
76struct iscsi_hdr {
77 uint8_t opcode;
78 uint8_t flags; /* Final bit */
79 uint8_t rsvd2[2];
80 uint8_t hlength; /* AHSs total length */
81 uint8_t dlength[3]; /* Data length */
82 struct scsi_lun lun;
83 itt_t itt; /* Initiator Task Tag, opaque for target */
84 __be32 ttt; /* Target Task Tag */
85 __be32 statsn;
86 __be32 exp_statsn;
87 __be32 max_statsn;
88 uint8_t other[12];
89};
90
91/************************* RFC 3720 Begin *****************************/
92
93#define ISCSI_RESERVED_TAG 0xffffffff
94
95/* Opcode encoding bits */
96#define ISCSI_OP_RETRY 0x80
97#define ISCSI_OP_IMMEDIATE 0x40
98#define ISCSI_OPCODE_MASK 0x3F
99
100/* Initiator Opcode values */
101#define ISCSI_OP_NOOP_OUT 0x00
102#define ISCSI_OP_SCSI_CMD 0x01
103#define ISCSI_OP_SCSI_TMFUNC 0x02
104#define ISCSI_OP_LOGIN 0x03
105#define ISCSI_OP_TEXT 0x04
106#define ISCSI_OP_SCSI_DATA_OUT 0x05
107#define ISCSI_OP_LOGOUT 0x06
108#define ISCSI_OP_SNACK 0x10
109
110#define ISCSI_OP_VENDOR1_CMD 0x1c
111#define ISCSI_OP_VENDOR2_CMD 0x1d
112#define ISCSI_OP_VENDOR3_CMD 0x1e
113#define ISCSI_OP_VENDOR4_CMD 0x1f
114
115/* Target Opcode values */
116#define ISCSI_OP_NOOP_IN 0x20
117#define ISCSI_OP_SCSI_CMD_RSP 0x21
118#define ISCSI_OP_SCSI_TMFUNC_RSP 0x22
119#define ISCSI_OP_LOGIN_RSP 0x23
120#define ISCSI_OP_TEXT_RSP 0x24
121#define ISCSI_OP_SCSI_DATA_IN 0x25
122#define ISCSI_OP_LOGOUT_RSP 0x26
123#define ISCSI_OP_R2T 0x31
124#define ISCSI_OP_ASYNC_EVENT 0x32
125#define ISCSI_OP_REJECT 0x3f
126
127struct iscsi_ahs_hdr {
128 __be16 ahslength;
129 uint8_t ahstype;
130 uint8_t ahspec[5];
131};
132
133#define ISCSI_AHSTYPE_CDB 1
134#define ISCSI_AHSTYPE_RLENGTH 2
135#define ISCSI_CDB_SIZE 16
136
137/* iSCSI PDU Header */
138struct iscsi_scsi_req {
139 uint8_t opcode;
140 uint8_t flags;
141 __be16 rsvd2;
142 uint8_t hlength;
143 uint8_t dlength[3];
144 struct scsi_lun lun;
145 itt_t itt; /* Initiator Task Tag */
146 __be32 data_length;
147 __be32 cmdsn;
148 __be32 exp_statsn;
149 uint8_t cdb[ISCSI_CDB_SIZE]; /* SCSI Command Block */
150 /* Additional Data (Command Dependent) */
151};
152
153/* Command PDU flags */
154#define ISCSI_FLAG_CMD_FINAL 0x80
155#define ISCSI_FLAG_CMD_READ 0x40
156#define ISCSI_FLAG_CMD_WRITE 0x20
157#define ISCSI_FLAG_CMD_ATTR_MASK 0x07 /* 3 bits */
158
159/* SCSI Command Attribute values */
160#define ISCSI_ATTR_UNTAGGED 0
161#define ISCSI_ATTR_SIMPLE 1
162#define ISCSI_ATTR_ORDERED 2
163#define ISCSI_ATTR_HEAD_OF_QUEUE 3
164#define ISCSI_ATTR_ACA 4
165
166struct iscsi_rlength_ahdr {
167 __be16 ahslength;
168 uint8_t ahstype;
169 uint8_t reserved;
170 __be32 read_length;
171};
172
173/* Extended CDB AHS */
174struct iscsi_ecdb_ahdr {
175 __be16 ahslength; /* CDB length - 15, including reserved byte */
176 uint8_t ahstype;
177 uint8_t reserved;
178 /* 4-byte aligned extended CDB spillover */
179 uint8_t ecdb[SCSI_MAX_VARLEN_CDB_SIZE - ISCSI_CDB_SIZE];
180};
181
182/* SCSI Response Header */
183struct iscsi_scsi_rsp {
184 uint8_t opcode;
185 uint8_t flags;
186 uint8_t response;
187 uint8_t cmd_status;
188 uint8_t hlength;
189 uint8_t dlength[3];
190 uint8_t rsvd[8];
191 itt_t itt; /* Initiator Task Tag */
192 __be32 rsvd1;
193 __be32 statsn;
194 __be32 exp_cmdsn;
195 __be32 max_cmdsn;
196 __be32 exp_datasn;
197 __be32 bi_residual_count;
198 __be32 residual_count;
199 /* Response or Sense Data (optional) */
200};
201
202/* Command Response PDU flags */
203#define ISCSI_FLAG_CMD_BIDI_OVERFLOW 0x10
204#define ISCSI_FLAG_CMD_BIDI_UNDERFLOW 0x08
205#define ISCSI_FLAG_CMD_OVERFLOW 0x04
206#define ISCSI_FLAG_CMD_UNDERFLOW 0x02
207
208/* iSCSI Status values. Valid if Rsp Selector bit is not set */
209#define ISCSI_STATUS_CMD_COMPLETED 0
210#define ISCSI_STATUS_TARGET_FAILURE 1
211#define ISCSI_STATUS_SUBSYS_FAILURE 2
212
213/* Asynchronous Event Header */
214struct iscsi_async {
215 uint8_t opcode;
216 uint8_t flags;
217 uint8_t rsvd2[2];
218 uint8_t rsvd3;
219 uint8_t dlength[3];
220 struct scsi_lun lun;
221 uint8_t rsvd4[8];
222 __be32 statsn;
223 __be32 exp_cmdsn;
224 __be32 max_cmdsn;
225 uint8_t async_event;
226 uint8_t async_vcode;
227 __be16 param1;
228 __be16 param2;
229 __be16 param3;
230 uint8_t rsvd5[4];
231};
232
233/* iSCSI Event Codes */
234#define ISCSI_ASYNC_MSG_SCSI_EVENT 0
235#define ISCSI_ASYNC_MSG_REQUEST_LOGOUT 1
236#define ISCSI_ASYNC_MSG_DROPPING_CONNECTION 2
237#define ISCSI_ASYNC_MSG_DROPPING_ALL_CONNECTIONS 3
238#define ISCSI_ASYNC_MSG_PARAM_NEGOTIATION 4
239#define ISCSI_ASYNC_MSG_VENDOR_SPECIFIC 255
240
241/* NOP-Out Message */
242struct iscsi_nopout {
243 uint8_t opcode;
244 uint8_t flags;
245 __be16 rsvd2;
246 uint8_t rsvd3;
247 uint8_t dlength[3];
248 struct scsi_lun lun;
249 itt_t itt; /* Initiator Task Tag */
250 __be32 ttt; /* Target Transfer Tag */
251 __be32 cmdsn;
252 __be32 exp_statsn;
253 uint8_t rsvd4[16];
254};
255
256/* NOP-In Message */
257struct iscsi_nopin {
258 uint8_t opcode;
259 uint8_t flags;
260 __be16 rsvd2;
261 uint8_t rsvd3;
262 uint8_t dlength[3];
263 struct scsi_lun lun;
264 itt_t itt; /* Initiator Task Tag */
265 __be32 ttt; /* Target Transfer Tag */
266 __be32 statsn;
267 __be32 exp_cmdsn;
268 __be32 max_cmdsn;
269 uint8_t rsvd4[12];
270};
271
272/* SCSI Task Management Message Header */
273struct iscsi_tm {
274 uint8_t opcode;
275 uint8_t flags;
276 uint8_t rsvd1[2];
277 uint8_t hlength;
278 uint8_t dlength[3];
279 struct scsi_lun lun;
280 itt_t itt; /* Initiator Task Tag */
281 itt_t rtt; /* Reference Task Tag */
282 __be32 cmdsn;
283 __be32 exp_statsn;
284 __be32 refcmdsn;
285 __be32 exp_datasn;
286 uint8_t rsvd2[8];
287};
288
289#define ISCSI_FLAG_TM_FUNC_MASK 0x7F
290
291/* Function values */
292#define ISCSI_TM_FUNC_ABORT_TASK 1
293#define ISCSI_TM_FUNC_ABORT_TASK_SET 2
294#define ISCSI_TM_FUNC_CLEAR_ACA 3
295#define ISCSI_TM_FUNC_CLEAR_TASK_SET 4
296#define ISCSI_TM_FUNC_LOGICAL_UNIT_RESET 5
297#define ISCSI_TM_FUNC_TARGET_WARM_RESET 6
298#define ISCSI_TM_FUNC_TARGET_COLD_RESET 7
299#define ISCSI_TM_FUNC_TASK_REASSIGN 8
300
301#define ISCSI_TM_FUNC_VALUE(hdr) ((hdr)->flags & ISCSI_FLAG_TM_FUNC_MASK)
302
303/* SCSI Task Management Response Header */
304struct iscsi_tm_rsp {
305 uint8_t opcode;
306 uint8_t flags;
307 uint8_t response; /* see Response values below */
308 uint8_t qualifier;
309 uint8_t hlength;
310 uint8_t dlength[3];
311 uint8_t rsvd2[8];
312 itt_t itt; /* Initiator Task Tag */
313 itt_t rtt; /* Reference Task Tag */
314 __be32 statsn;
315 __be32 exp_cmdsn;
316 __be32 max_cmdsn;
317 uint8_t rsvd3[12];
318};
319
320/* Response values */
321#define ISCSI_TMF_RSP_COMPLETE 0x00
322#define ISCSI_TMF_RSP_NO_TASK 0x01
323#define ISCSI_TMF_RSP_NO_LUN 0x02
324#define ISCSI_TMF_RSP_TASK_ALLEGIANT 0x03
325#define ISCSI_TMF_RSP_NO_FAILOVER 0x04
326#define ISCSI_TMF_RSP_NOT_SUPPORTED 0x05
327#define ISCSI_TMF_RSP_AUTH_FAILED 0x06
328#define ISCSI_TMF_RSP_REJECTED 0xff
329
330/* Ready To Transfer Header */
331struct iscsi_r2t_rsp {
332 uint8_t opcode;
333 uint8_t flags;
334 uint8_t rsvd2[2];
335 uint8_t hlength;
336 uint8_t dlength[3];
337 struct scsi_lun lun;
338 itt_t itt; /* Initiator Task Tag */
339 __be32 ttt; /* Target Transfer Tag */
340 __be32 statsn;
341 __be32 exp_cmdsn;
342 __be32 max_cmdsn;
343 __be32 r2tsn;
344 __be32 data_offset;
345 __be32 data_length;
346};
347
348/* SCSI Data Hdr */
349struct iscsi_data {
350 uint8_t opcode;
351 uint8_t flags;
352 uint8_t rsvd2[2];
353 uint8_t rsvd3;
354 uint8_t dlength[3];
355 struct scsi_lun lun;
356 itt_t itt;
357 __be32 ttt;
358 __be32 rsvd4;
359 __be32 exp_statsn;
360 __be32 rsvd5;
361 __be32 datasn;
362 __be32 offset;
363 __be32 rsvd6;
364 /* Payload */
365};
366
367/* SCSI Data Response Hdr */
368struct iscsi_data_rsp {
369 uint8_t opcode;
370 uint8_t flags;
371 uint8_t rsvd2;
372 uint8_t cmd_status;
373 uint8_t hlength;
374 uint8_t dlength[3];
375 struct scsi_lun lun;
376 itt_t itt;
377 __be32 ttt;
378 __be32 statsn;
379 __be32 exp_cmdsn;
380 __be32 max_cmdsn;
381 __be32 datasn;
382 __be32 offset;
383 __be32 residual_count;
384};
385
386/* Data Response PDU flags */
387#define ISCSI_FLAG_DATA_ACK 0x40
388#define ISCSI_FLAG_DATA_OVERFLOW 0x04
389#define ISCSI_FLAG_DATA_UNDERFLOW 0x02
390#define ISCSI_FLAG_DATA_STATUS 0x01
391
392/* Text Header */
393struct iscsi_text {
394 uint8_t opcode;
395 uint8_t flags;
396 uint8_t rsvd2[2];
397 uint8_t hlength;
398 uint8_t dlength[3];
399 uint8_t rsvd4[8];
400 itt_t itt;
401 __be32 ttt;
402 __be32 cmdsn;
403 __be32 exp_statsn;
404 uint8_t rsvd5[16];
405 /* Text - key=value pairs */
406};
407
408#define ISCSI_FLAG_TEXT_CONTINUE 0x40
409
410/* Text Response Header */
411struct iscsi_text_rsp {
412 uint8_t opcode;
413 uint8_t flags;
414 uint8_t rsvd2[2];
415 uint8_t hlength;
416 uint8_t dlength[3];
417 uint8_t rsvd4[8];
418 itt_t itt;
419 __be32 ttt;
420 __be32 statsn;
421 __be32 exp_cmdsn;
422 __be32 max_cmdsn;
423 uint8_t rsvd5[12];
424 /* Text Response - key:value pairs */
425};
426
427/* Login Header */
428struct iscsi_login_req {
429 uint8_t opcode;
430 uint8_t flags;
431 uint8_t max_version; /* Max. version supported */
432 uint8_t min_version; /* Min. version supported */
433 uint8_t hlength;
434 uint8_t dlength[3];
435 uint8_t isid[6]; /* Initiator Session ID */
436 __be16 tsih; /* Target Session Handle */
437 itt_t itt; /* Initiator Task Tag */
438 __be16 cid;
439 __be16 rsvd3;
440 __be32 cmdsn;
441 __be32 exp_statsn;
442 uint8_t rsvd5[16];
443};
444
445/* Login PDU flags */
446#define ISCSI_FLAG_LOGIN_TRANSIT 0x80
447#define ISCSI_FLAG_LOGIN_CONTINUE 0x40
448#define ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK 0x0C /* 2 bits */
449#define ISCSI_FLAG_LOGIN_CURRENT_STAGE1 0x04
450#define ISCSI_FLAG_LOGIN_CURRENT_STAGE2 0x08
451#define ISCSI_FLAG_LOGIN_CURRENT_STAGE3 0x0C
452#define ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK 0x03 /* 2 bits */
453#define ISCSI_FLAG_LOGIN_NEXT_STAGE1 0x01
454#define ISCSI_FLAG_LOGIN_NEXT_STAGE2 0x02
455#define ISCSI_FLAG_LOGIN_NEXT_STAGE3 0x03
456
457#define ISCSI_LOGIN_CURRENT_STAGE(flags) \
458 ((flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK) >> 2)
459#define ISCSI_LOGIN_NEXT_STAGE(flags) \
460 (flags & ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK)
461
462/* Login Response Header */
463struct iscsi_login_rsp {
464 uint8_t opcode;
465 uint8_t flags;
466 uint8_t max_version; /* Max. version supported */
467 uint8_t active_version; /* Active version */
468 uint8_t hlength;
469 uint8_t dlength[3];
470 uint8_t isid[6]; /* Initiator Session ID */
471 __be16 tsih; /* Target Session Handle */
472 itt_t itt; /* Initiator Task Tag */
473 __be32 rsvd3;
474 __be32 statsn;
475 __be32 exp_cmdsn;
476 __be32 max_cmdsn;
477 uint8_t status_class; /* see Login RSP ststus classes below */
478 uint8_t status_detail; /* see Login RSP Status details below */
479 uint8_t rsvd4[10];
480};
481
482/* Login stage (phase) codes for CSG, NSG */
483#define ISCSI_INITIAL_LOGIN_STAGE -1
484#define ISCSI_SECURITY_NEGOTIATION_STAGE 0
485#define ISCSI_OP_PARMS_NEGOTIATION_STAGE 1
486#define ISCSI_FULL_FEATURE_PHASE 3
487
488/* Login Status response classes */
489#define ISCSI_STATUS_CLS_SUCCESS 0x00
490#define ISCSI_STATUS_CLS_REDIRECT 0x01
491#define ISCSI_STATUS_CLS_INITIATOR_ERR 0x02
492#define ISCSI_STATUS_CLS_TARGET_ERR 0x03
493
494/* Login Status response detail codes */
495/* Class-0 (Success) */
496#define ISCSI_LOGIN_STATUS_ACCEPT 0x00
497
498/* Class-1 (Redirection) */
499#define ISCSI_LOGIN_STATUS_TGT_MOVED_TEMP 0x01
500#define ISCSI_LOGIN_STATUS_TGT_MOVED_PERM 0x02
501
502/* Class-2 (Initiator Error) */
503#define ISCSI_LOGIN_STATUS_INIT_ERR 0x00
504#define ISCSI_LOGIN_STATUS_AUTH_FAILED 0x01
505#define ISCSI_LOGIN_STATUS_TGT_FORBIDDEN 0x02
506#define ISCSI_LOGIN_STATUS_TGT_NOT_FOUND 0x03
507#define ISCSI_LOGIN_STATUS_TGT_REMOVED 0x04
508#define ISCSI_LOGIN_STATUS_NO_VERSION 0x05
509#define ISCSI_LOGIN_STATUS_ISID_ERROR 0x06
510#define ISCSI_LOGIN_STATUS_MISSING_FIELDS 0x07
511#define ISCSI_LOGIN_STATUS_CONN_ADD_FAILED 0x08
512#define ISCSI_LOGIN_STATUS_NO_SESSION_TYPE 0x09
513#define ISCSI_LOGIN_STATUS_NO_SESSION 0x0a
514#define ISCSI_LOGIN_STATUS_INVALID_REQUEST 0x0b
515
516/* Class-3 (Target Error) */
517#define ISCSI_LOGIN_STATUS_TARGET_ERROR 0x00
518#define ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE 0x01
519#define ISCSI_LOGIN_STATUS_NO_RESOURCES 0x02
520
521/* Logout Header */
522struct iscsi_logout {
523 uint8_t opcode;
524 uint8_t flags;
525 uint8_t rsvd1[2];
526 uint8_t hlength;
527 uint8_t dlength[3];
528 uint8_t rsvd2[8];
529 itt_t itt; /* Initiator Task Tag */
530 __be16 cid;
531 uint8_t rsvd3[2];
532 __be32 cmdsn;
533 __be32 exp_statsn;
534 uint8_t rsvd4[16];
535};
536
537/* Logout PDU flags */
538#define ISCSI_FLAG_LOGOUT_REASON_MASK 0x7F
539
540/* logout reason_code values */
541
542#define ISCSI_LOGOUT_REASON_CLOSE_SESSION 0
543#define ISCSI_LOGOUT_REASON_CLOSE_CONNECTION 1
544#define ISCSI_LOGOUT_REASON_RECOVERY 2
545#define ISCSI_LOGOUT_REASON_AEN_REQUEST 3
546
547/* Logout Response Header */
548struct iscsi_logout_rsp {
549 uint8_t opcode;
550 uint8_t flags;
551 uint8_t response; /* see Logout response values below */
552 uint8_t rsvd2;
553 uint8_t hlength;
554 uint8_t dlength[3];
555 uint8_t rsvd3[8];
556 itt_t itt; /* Initiator Task Tag */
557 __be32 rsvd4;
558 __be32 statsn;
559 __be32 exp_cmdsn;
560 __be32 max_cmdsn;
561 __be32 rsvd5;
562 __be16 t2wait;
563 __be16 t2retain;
564 __be32 rsvd6;
565};
566
567/* logout response status values */
568
569#define ISCSI_LOGOUT_SUCCESS 0
570#define ISCSI_LOGOUT_CID_NOT_FOUND 1
571#define ISCSI_LOGOUT_RECOVERY_UNSUPPORTED 2
572#define ISCSI_LOGOUT_CLEANUP_FAILED 3
573
574/* SNACK Header */
575struct iscsi_snack {
576 uint8_t opcode;
577 uint8_t flags;
578 uint8_t rsvd2[2];
579 uint8_t hlength;
580 uint8_t dlength[3];
581 uint8_t lun[8];
582 itt_t itt;
583 __be32 ttt;
584 uint8_t rsvd3[4];
585 __be32 exp_statsn;
586 uint8_t rsvd4[8];
587 __be32 begrun;
588 __be32 runlength;
589};
590
591/* SNACK PDU flags */
592#define ISCSI_FLAG_SNACK_TYPE_DATA 0
593#define ISCSI_FLAG_SNACK_TYPE_R2T 0
594#define ISCSI_FLAG_SNACK_TYPE_STATUS 1
595#define ISCSI_FLAG_SNACK_TYPE_DATA_ACK 2
596#define ISCSI_FLAG_SNACK_TYPE_RDATA 3
597#define ISCSI_FLAG_SNACK_TYPE_MASK 0x0F /* 4 bits */
598
599/* Reject Message Header */
600struct iscsi_reject {
601 uint8_t opcode;
602 uint8_t flags;
603 uint8_t reason;
604 uint8_t rsvd2;
605 uint8_t hlength;
606 uint8_t dlength[3];
607 uint8_t rsvd3[8];
608 __be32 ffffffff;
609 uint8_t rsvd4[4];
610 __be32 statsn;
611 __be32 exp_cmdsn;
612 __be32 max_cmdsn;
613 __be32 datasn;
614 uint8_t rsvd5[8];
615 /* Text - Rejected hdr */
616};
617
618/* Reason for Reject */
619#define ISCSI_REASON_CMD_BEFORE_LOGIN 1
620#define ISCSI_REASON_DATA_DIGEST_ERROR 2
621#define ISCSI_REASON_DATA_SNACK_REJECT 3
622#define ISCSI_REASON_PROTOCOL_ERROR 4
623#define ISCSI_REASON_CMD_NOT_SUPPORTED 5
624#define ISCSI_REASON_IMM_CMD_REJECT 6
625#define ISCSI_REASON_TASK_IN_PROGRESS 7
626#define ISCSI_REASON_INVALID_SNACK 8
627#define ISCSI_REASON_BOOKMARK_INVALID 9
628#define ISCSI_REASON_BOOKMARK_NO_RESOURCES 10
629#define ISCSI_REASON_NEGOTIATION_RESET 11
630
631/* Max. number of Key=Value pairs in a text message */
632#define MAX_KEY_VALUE_PAIRS 8192
633
634/* maximum length for text keys/values */
635#define KEY_MAXLEN 64
636#define VALUE_MAXLEN 255
637#define TARGET_NAME_MAXLEN VALUE_MAXLEN
638
639#define ISCSI_DEF_MAX_RECV_SEG_LEN 8192
640#define ISCSI_MIN_MAX_RECV_SEG_LEN 512
641#define ISCSI_MAX_MAX_RECV_SEG_LEN 16777215
642
643#define ISCSI_DEF_FIRST_BURST_LEN 65536
644#define ISCSI_MIN_FIRST_BURST_LEN 512
645#define ISCSI_MAX_FIRST_BURST_LEN 16777215
646
647#define ISCSI_DEF_MAX_BURST_LEN 262144
648#define ISCSI_MIN_MAX_BURST_LEN 512
649#define ISCSI_MAX_MAX_BURST_LEN 16777215
650
651#define ISCSI_DEF_TIME2WAIT 2
652
653#define ISCSI_NAME_LEN 224
654
655/************************* RFC 3720 End *****************************/
656
657#endif /* ISCSI_PROTO_H */
658

source code of linux/include/scsi/iscsi_proto.h