1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * NVMe over Fabrics TCP protocol header.
4 * Copyright (c) 2018 Lightbits Labs. All rights reserved.
5 */
6
7#ifndef _LINUX_NVME_TCP_H
8#define _LINUX_NVME_TCP_H
9
10#include <linux/nvme.h>
11
12#define NVME_TCP_DISC_PORT 8009
13#define NVME_TCP_ADMIN_CCSZ SZ_8K
14#define NVME_TCP_DIGEST_LENGTH 4
15
16enum nvme_tcp_pfv {
17 NVME_TCP_PFV_1_0 = 0x0,
18};
19
20enum nvme_tcp_fatal_error_status {
21 NVME_TCP_FES_INVALID_PDU_HDR = 0x01,
22 NVME_TCP_FES_PDU_SEQ_ERR = 0x02,
23 NVME_TCP_FES_HDR_DIGEST_ERR = 0x03,
24 NVME_TCP_FES_DATA_OUT_OF_RANGE = 0x04,
25 NVME_TCP_FES_R2T_LIMIT_EXCEEDED = 0x05,
26 NVME_TCP_FES_DATA_LIMIT_EXCEEDED = 0x05,
27 NVME_TCP_FES_UNSUPPORTED_PARAM = 0x06,
28};
29
30enum nvme_tcp_digest_option {
31 NVME_TCP_HDR_DIGEST_ENABLE = (1 << 0),
32 NVME_TCP_DATA_DIGEST_ENABLE = (1 << 1),
33};
34
35enum nvme_tcp_pdu_type {
36 nvme_tcp_icreq = 0x0,
37 nvme_tcp_icresp = 0x1,
38 nvme_tcp_h2c_term = 0x2,
39 nvme_tcp_c2h_term = 0x3,
40 nvme_tcp_cmd = 0x4,
41 nvme_tcp_rsp = 0x5,
42 nvme_tcp_h2c_data = 0x6,
43 nvme_tcp_c2h_data = 0x7,
44 nvme_tcp_r2t = 0x9,
45};
46
47enum nvme_tcp_pdu_flags {
48 NVME_TCP_F_HDGST = (1 << 0),
49 NVME_TCP_F_DDGST = (1 << 1),
50 NVME_TCP_F_DATA_LAST = (1 << 2),
51 NVME_TCP_F_DATA_SUCCESS = (1 << 3),
52};
53
54/**
55 * struct nvme_tcp_hdr - nvme tcp pdu common header
56 *
57 * @type: pdu type
58 * @flags: pdu specific flags
59 * @hlen: pdu header length
60 * @pdo: pdu data offset
61 * @plen: pdu wire byte length
62 */
63struct nvme_tcp_hdr {
64 __u8 type;
65 __u8 flags;
66 __u8 hlen;
67 __u8 pdo;
68 __le32 plen;
69};
70
71/**
72 * struct nvme_tcp_icreq_pdu - nvme tcp initialize connection request pdu
73 *
74 * @hdr: pdu generic header
75 * @pfv: pdu version format
76 * @hpda: host pdu data alignment (dwords, 0's based)
77 * @digest: digest types enabled
78 * @maxr2t: maximum r2ts per request supported
79 */
80struct nvme_tcp_icreq_pdu {
81 struct nvme_tcp_hdr hdr;
82 __le16 pfv;
83 __u8 hpda;
84 __u8 digest;
85 __le32 maxr2t;
86 __u8 rsvd2[112];
87};
88
89/**
90 * struct nvme_tcp_icresp_pdu - nvme tcp initialize connection response pdu
91 *
92 * @hdr: pdu common header
93 * @pfv: pdu version format
94 * @cpda: controller pdu data alignment (dowrds, 0's based)
95 * @digest: digest types enabled
96 * @maxdata: maximum data capsules per r2t supported
97 */
98struct nvme_tcp_icresp_pdu {
99 struct nvme_tcp_hdr hdr;
100 __le16 pfv;
101 __u8 cpda;
102 __u8 digest;
103 __le32 maxdata;
104 __u8 rsvd[112];
105};
106
107/**
108 * struct nvme_tcp_term_pdu - nvme tcp terminate connection pdu
109 *
110 * @hdr: pdu common header
111 * @fes: fatal error status
112 * @fei: fatal error information
113 */
114struct nvme_tcp_term_pdu {
115 struct nvme_tcp_hdr hdr;
116 __le16 fes;
117 __le32 fei;
118 __u8 rsvd[8];
119};
120
121/**
122 * struct nvme_tcp_cmd_pdu - nvme tcp command capsule pdu
123 *
124 * @hdr: pdu common header
125 * @cmd: nvme command
126 */
127struct nvme_tcp_cmd_pdu {
128 struct nvme_tcp_hdr hdr;
129 struct nvme_command cmd;
130};
131
132/**
133 * struct nvme_tcp_rsp_pdu - nvme tcp response capsule pdu
134 *
135 * @hdr: pdu common header
136 * @hdr: nvme-tcp generic header
137 * @cqe: nvme completion queue entry
138 */
139struct nvme_tcp_rsp_pdu {
140 struct nvme_tcp_hdr hdr;
141 struct nvme_completion cqe;
142};
143
144/**
145 * struct nvme_tcp_r2t_pdu - nvme tcp ready-to-transfer pdu
146 *
147 * @hdr: pdu common header
148 * @command_id: nvme command identifier which this relates to
149 * @ttag: transfer tag (controller generated)
150 * @r2t_offset: offset from the start of the command data
151 * @r2t_length: length the host is allowed to send
152 */
153struct nvme_tcp_r2t_pdu {
154 struct nvme_tcp_hdr hdr;
155 __u16 command_id;
156 __u16 ttag;
157 __le32 r2t_offset;
158 __le32 r2t_length;
159 __u8 rsvd[4];
160};
161
162/**
163 * struct nvme_tcp_data_pdu - nvme tcp data pdu
164 *
165 * @hdr: pdu common header
166 * @command_id: nvme command identifier which this relates to
167 * @ttag: transfer tag (controller generated)
168 * @data_offset: offset from the start of the command data
169 * @data_length: length of the data stream
170 */
171struct nvme_tcp_data_pdu {
172 struct nvme_tcp_hdr hdr;
173 __u16 command_id;
174 __u16 ttag;
175 __le32 data_offset;
176 __le32 data_length;
177 __u8 rsvd[4];
178};
179
180union nvme_tcp_pdu {
181 struct nvme_tcp_icreq_pdu icreq;
182 struct nvme_tcp_icresp_pdu icresp;
183 struct nvme_tcp_cmd_pdu cmd;
184 struct nvme_tcp_rsp_pdu rsp;
185 struct nvme_tcp_r2t_pdu r2t;
186 struct nvme_tcp_data_pdu data;
187};
188
189#endif /* _LINUX_NVME_TCP_H */
190