summaryrefslogtreecommitdiff
path: root/include/linux/nvme-tcp.h
blob: 57ebe1267f7fbe96166e9c40621192330d6fcbc4 (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
/* SPDX-License-Identifier: GPL-2.0 */
/*
 * NVMe over Fabrics TCP protocol header.
 * Copyright (c) 2018 Lightbits Labs. All rights reserved.
 */

#ifndef _LINUX_NVME_TCP_H
#define _LINUX_NVME_TCP_H

#include <linux/nvme.h>

#define NVME_TCP_DISC_PORT	8009
#define NVME_TCP_ADMIN_CCSZ	SZ_8K
#define NVME_TCP_DIGEST_LENGTH	4
#define NVME_TCP_MIN_MAXH2CDATA 4096

enum nvme_tcp_pfv {
	NVME_TCP_PFV_1_0 = 0x0,
};

enum nvme_tcp_fatal_error_status {
	NVME_TCP_FES_INVALID_PDU_HDR		= 0x01,
	NVME_TCP_FES_PDU_SEQ_ERR		= 0x02,
	NVME_TCP_FES_HDR_DIGEST_ERR		= 0x03,
	NVME_TCP_FES_DATA_OUT_OF_RANGE		= 0x04,
	NVME_TCP_FES_R2T_LIMIT_EXCEEDED		= 0x05,
	NVME_TCP_FES_DATA_LIMIT_EXCEEDED	= 0x05,
	NVME_TCP_FES_UNSUPPORTED_PARAM		= 0x06,
};

enum nvme_tcp_digest_option {
	NVME_TCP_HDR_DIGEST_ENABLE	= (1 << 0),
	NVME_TCP_DATA_DIGEST_ENABLE	= (1 << 1),
};

enum nvme_tcp_pdu_type {
	nvme_tcp_icreq		= 0x0,
	nvme_tcp_icresp		= 0x1,
	nvme_tcp_h2c_term	= 0x2,
	nvme_tcp_c2h_term	= 0x3,
	nvme_tcp_cmd		= 0x4,
	nvme_tcp_rsp		= 0x5,
	nvme_tcp_h2c_data	= 0x6,
	nvme_tcp_c2h_data	= 0x7,
	nvme_tcp_r2t		= 0x9,
};

enum nvme_tcp_pdu_flags {
	NVME_TCP_F_HDGST		= (1 << 0),
	NVME_TCP_F_DDGST		= (1 << 1),
	NVME_TCP_F_DATA_LAST		= (1 << 2),
	NVME_TCP_F_DATA_SUCCESS		= (1 << 3),
};

/**
 * struct nvme_tcp_hdr - nvme tcp pdu common header
 *
 * @type:          pdu type
 * @flags:         pdu specific flags
 * @hlen:          pdu header length
 * @pdo:           pdu data offset
 * @plen:          pdu wire byte length
 */
struct nvme_tcp_hdr {
	__u8	type;
	__u8	flags;
	__u8	hlen;
	__u8	pdo;
	__le32	plen;
};

/**
 * struct nvme_tcp_icreq_pdu - nvme tcp initialize connection request pdu
 *
 * @hdr:           pdu generic header
 * @pfv:           pdu version format
 * @hpda:          host pdu data alignment (dwords, 0's based)
 * @digest:        digest types enabled
 * @maxr2t:        maximum r2ts per request supported
 */
struct nvme_tcp_icreq_pdu {
	struct nvme_tcp_hdr	hdr;
	__le16			pfv;
	__u8			hpda;
	__u8			digest;
	__le32			maxr2t;
	__u8			rsvd2[112];
};

/**
 * struct nvme_tcp_icresp_pdu - nvme tcp initialize connection response pdu
 *
 * @hdr:           pdu common header
 * @pfv:           pdu version format
 * @cpda:          controller pdu data alignment (dowrds, 0's based)
 * @digest:        digest types enabled
 * @maxdata:       maximum data capsules per r2t supported
 */
struct nvme_tcp_icresp_pdu {
	struct nvme_tcp_hdr	hdr;
	__le16			pfv;
	__u8			cpda;
	__u8			digest;
	__le32			maxdata;
	__u8			rsvd[112];
};

/**
 * struct nvme_tcp_term_pdu - nvme tcp terminate connection pdu
 *
 * @hdr:           pdu common header
 * @fes:           fatal error status
 * @fei:           fatal error information
 */
struct nvme_tcp_term_pdu {
	struct nvme_tcp_hdr	hdr;
	__le16			fes;
	__le16			feil;
	__le16			feiu;
	__u8			rsvd[10];
};

/**
 * struct nvme_tcp_cmd_pdu - nvme tcp command capsule pdu
 *
 * @hdr:           pdu common header
 * @cmd:           nvme command
 */
struct nvme_tcp_cmd_pdu {
	struct nvme_tcp_hdr	hdr;
	struct nvme_command	cmd;
};

/**
 * struct nvme_tcp_rsp_pdu - nvme tcp response capsule pdu
 *
 * @hdr:           pdu common header
 * @hdr:           nvme-tcp generic header
 * @cqe:           nvme completion queue entry
 */
struct nvme_tcp_rsp_pdu {
	struct nvme_tcp_hdr	hdr;
	struct nvme_completion	cqe;
};

/**
 * struct nvme_tcp_r2t_pdu - nvme tcp ready-to-transfer pdu
 *
 * @hdr:           pdu common header
 * @command_id:    nvme command identifier which this relates to
 * @ttag:          transfer tag (controller generated)
 * @r2t_offset:    offset from the start of the command data
 * @r2t_length:    length the host is allowed to send
 */
struct nvme_tcp_r2t_pdu {
	struct nvme_tcp_hdr	hdr;
	__u16			command_id;
	__u16			ttag;
	__le32			r2t_offset;
	__le32			r2t_length;
	__u8			rsvd[4];
};

/**
 * struct nvme_tcp_data_pdu - nvme tcp data pdu
 *
 * @hdr:           pdu common header
 * @command_id:    nvme command identifier which this relates to
 * @ttag:          transfer tag (controller generated)
 * @data_offset:   offset from the start of the command data
 * @data_length:   length of the data stream
 */
struct nvme_tcp_data_pdu {
	struct nvme_tcp_hdr	hdr;
	__u16			command_id;
	__u16			ttag;
	__le32			data_offset;
	__le32			data_length;
	__u8			rsvd[4];
};

union nvme_tcp_pdu {
	struct nvme_tcp_icreq_pdu	icreq;
	struct nvme_tcp_icresp_pdu	icresp;
	struct nvme_tcp_cmd_pdu		cmd;
	struct nvme_tcp_rsp_pdu		rsp;
	struct nvme_tcp_r2t_pdu		r2t;
	struct nvme_tcp_data_pdu	data;
};

#endif /* _LINUX_NVME_TCP_H */