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055d045a | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
fc221d05 SG |
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 | ||
16 | enum nvme_tcp_pfv { | |
17 | NVME_TCP_PFV_1_0 = 0x0, | |
18 | }; | |
19 | ||
20 | enum 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 | ||
30 | enum nvme_tcp_digest_option { | |
31 | NVME_TCP_HDR_DIGEST_ENABLE = (1 << 0), | |
32 | NVME_TCP_DATA_DIGEST_ENABLE = (1 << 1), | |
33 | }; | |
34 | ||
35 | enum 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 | ||
47 | enum 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 | */ | |
63 | struct 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 | */ | |
80 | struct 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 | */ | |
98 | struct 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 | */ | |
114 | struct 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 | */ | |
127 | struct 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 | */ | |
139 | struct 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 | */ | |
153 | struct 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 | */ | |
171 | struct 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 | ||
180 | union 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 */ |