aboutsummaryrefslogtreecommitdiff
path: root/include/scsi/srp.h
blob: 177d8026e96f5fba4192695c692cb7b1c4338461 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
/*
 * Copyright (c) 2005 Cisco Systems.  All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 * $Id$
 */

#ifndef SCSI_SRP_H
#define SCSI_SRP_H

/*
 * Structures and constants for the SCSI RDMA Protocol (SRP) as
 * defined by the INCITS T10 committee.  This file was written using
 * draft Revision 16a of the SRP standard.
 */

#include <linux/types.h>
#include <scsi/scsi.h>

enum {
	SRP_LOGIN_REQ	= 0x00,
	SRP_TSK_MGMT	= 0x01,
	SRP_CMD		= 0x02,
	SRP_I_LOGOUT	= 0x03,
	SRP_LOGIN_RSP	= 0xc0,
	SRP_RSP		= 0xc1,
	SRP_LOGIN_REJ	= 0xc2,
	SRP_T_LOGOUT	= 0x80,
	SRP_CRED_REQ	= 0x81,
	SRP_AER_REQ	= 0x82,
	SRP_CRED_RSP	= 0x41,
	SRP_AER_RSP	= 0x42
};

enum {
	SRP_BUF_FORMAT_DIRECT	= 1 << 1,
	SRP_BUF_FORMAT_INDIRECT	= 1 << 2
};

enum {
	SRP_NO_DATA_DESC	= 0,
	SRP_DATA_DESC_DIRECT	= 1,
	SRP_DATA_DESC_INDIRECT	= 2,
	SRP_DATA_DESC_IMM	= 3,	/* new in SRP2 */
};

enum {
	SRP_TSK_ABORT_TASK	= 0x01,
	SRP_TSK_ABORT_TASK_SET	= 0x02,
	SRP_TSK_CLEAR_TASK_SET	= 0x04,
	SRP_TSK_LUN_RESET	= 0x08,
	SRP_TSK_CLEAR_ACA	= 0x40
};

enum srp_login_rej_reason {
	SRP_LOGIN_REJ_UNABLE_ESTABLISH_CHANNEL		= 0x00010000,
	SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES		= 0x00010001,
	SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE	= 0x00010002,
	SRP_LOGIN_REJ_UNABLE_ASSOCIATE_CHANNEL		= 0x00010003,
	SRP_LOGIN_REJ_UNSUPPORTED_DESCRIPTOR_FMT	= 0x00010004,
	SRP_LOGIN_REJ_MULTI_CHANNEL_UNSUPPORTED		= 0x00010005,
	SRP_LOGIN_REJ_CHANNEL_LIMIT_REACHED		= 0x00010006
};

enum {
	SRP_REV10_IB_IO_CLASS	= 0xff00,
	SRP_REV16A_IB_IO_CLASS	= 0x0100
};

struct srp_direct_buf {
	__be64	va;
	__be32	key;
	__be32  len;
};

/*
 * We need the packed attribute because the SRP spec puts the list of
 * descriptors at an offset of 20, which is not aligned to the size of
 * struct srp_direct_buf.  The whole structure must be packed to avoid
 * having the 20-byte structure padded to 24 bytes on 64-bit architectures.
 */
struct srp_indirect_buf {
	struct srp_direct_buf	table_desc;
	__be32			len;
	struct srp_direct_buf	desc_list[];
} __attribute__((packed));

/* Immediate data buffer descriptor as defined in SRP2. */
struct srp_imm_buf {
	__be32	len;
};

/* srp_login_req.flags */
enum {
	SRP_MULTICHAN_SINGLE = 0,
	SRP_MULTICHAN_MULTI  = 1,
	SRP_IMMED_REQUESTED  = 0x80,	/* new in SRP2 */
};

struct srp_login_req {
	u8	opcode;
	u8	reserved1[7];
	u64	tag;
	__be32	req_it_iu_len;
	u8	reserved2[4];
	__be16	req_buf_fmt;
	u8	req_flags;
	u8	reserved3[1];
	__be16	imm_data_offset;	/* new in SRP2 */
	u8	reserved4[2];
	u8	initiator_port_id[16];
	u8	target_port_id[16];
};

/**
 * struct srp_login_req_rdma - RDMA/CM login parameters.
 *
 * RDMA/CM over InfiniBand can only carry 92 - 36 = 56 bytes of private
 * data. The %srp_login_req_rdma structure contains the same information as
 * %srp_login_req but with the reserved data removed.
 */
struct srp_login_req_rdma {
	u64	tag;
	__be16	req_buf_fmt;
	u8	req_flags;
	u8	opcode;
	__be32	req_it_iu_len;
	u8	initiator_port_id[16];
	u8	target_port_id[16];
	__be16	imm_data_offset;
	u8	reserved[6];
};

/* srp_login_rsp.rsp_flags */
enum {
	SRP_LOGIN_RSP_MULTICHAN_NO_CHAN	   = 0x0,
	SRP_LOGIN_RSP_MULTICHAN_TERMINATED = 0x1,
	SRP_LOGIN_RSP_MULTICHAN_MAINTAINED = 0x2,
	SRP_LOGIN_RSP_IMMED_SUPP	   = 0x80, /* new in SRP2 */
};

/*
 * The SRP spec defines the size of the LOGIN_RSP structure to be 52
 * bytes, so it needs to be packed to avoid having it padded to 56
 * bytes on 64-bit architectures.
 */
struct srp_login_rsp {
	u8	opcode;
	u8	reserved1[3];
	__be32	req_lim_delta;
	u64	tag;
	__be32	max_it_iu_len;
	__be32	max_ti_iu_len;
	__be16	buf_fmt;
	u8	rsp_flags;
	u8	reserved2[25];
} __attribute__((packed));

struct srp_login_rej {
	u8	opcode;
	u8	reserved1[3];
	__be32	reason;
	u64	tag;
	u8	reserved2[8];
	__be16	buf_fmt;
	u8	reserved3[6];
};

struct srp_i_logout {
	u8	opcode;
	u8	reserved[7];
	u64	tag;
};

struct srp_t_logout {
	u8	opcode;
	u8	sol_not;
	u8	reserved[2];
	__be32	reason;
	u64	tag;
};

/*
 * We need the packed attribute because the SRP spec only aligns the
 * 8-byte LUN field to 4 bytes.
 */
struct srp_tsk_mgmt {
	u8	opcode;
	u8	sol_not;
	u8	reserved1[6];
	u64	tag;
	u8	reserved2[4];
	struct scsi_lun	lun;
	u8	reserved3[2];
	u8	tsk_mgmt_func;
	u8	reserved4;
	u64	task_tag;
	u8	reserved5[8];
};

/*
 * We need the packed attribute because the SRP spec only aligns the
 * 8-byte LUN field to 4 bytes.
 */
struct srp_cmd {
	u8	opcode;
	u8	sol_not;
	u8	reserved1[3];
	u8	buf_fmt;
	u8	data_out_desc_cnt;
	u8	data_in_desc_cnt;
	u64	tag;
	u8	reserved2[4];
	struct scsi_lun	lun;
	u8	reserved3;
	u8	task_attr;
	u8	reserved4;
	u8	add_cdb_len;
	u8	cdb[16];
	u8	add_data[];
};

enum {
	SRP_RSP_FLAG_RSPVALID = 1 << 0,
	SRP_RSP_FLAG_SNSVALID = 1 << 1,
	SRP_RSP_FLAG_DOOVER   = 1 << 2,
	SRP_RSP_FLAG_DOUNDER  = 1 << 3,
	SRP_RSP_FLAG_DIOVER   = 1 << 4,
	SRP_RSP_FLAG_DIUNDER  = 1 << 5
};

/*
 * The SRP spec defines the size of the RSP structure to be 36 bytes,
 * so it needs to be packed to avoid having it padded to 40 bytes on
 * 64-bit architectures.
 */
struct srp_rsp {
	u8	opcode;
	u8	sol_not;
	u8	reserved1[2];
	__be32	req_lim_delta;
	u64	tag;
	u8	reserved2[2];
	u8	flags;
	u8	status;
	__be32	data_out_res_cnt;
	__be32	data_in_res_cnt;
	__be32	sense_data_len;
	__be32	resp_data_len;
	u8	data[];
} __attribute__((packed));

struct srp_cred_req {
	u8	opcode;
	u8	sol_not;
	u8	reserved[2];
	__be32	req_lim_delta;
	u64	tag;
};

struct srp_cred_rsp {
	u8	opcode;
	u8	reserved[7];
	u64	tag;
};

/*
 * The SRP spec defines the fixed portion of the AER_REQ structure to be
 * 36 bytes, so it needs to be packed to avoid having it padded to 40 bytes
 * on 64-bit architectures.
 */
struct srp_aer_req {
	u8	opcode;
	u8	sol_not;
	u8	reserved[2];
	__be32	req_lim_delta;
	u64	tag;
	u32	reserved2;
	struct scsi_lun	lun;
	__be32	sense_data_len;
	u32	reserved3;
	u8	sense_data[];
} __attribute__((packed));

struct srp_aer_rsp {
	u8	opcode;
	u8	reserved[7];
	u64	tag;
};

#endif /* SCSI_SRP_H */