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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
a046d57d UB |
2 | /* |
3 | * Shared Memory Communications over RDMA (SMC-R) and RoCE | |
4 | * | |
5 | * CLC (connection layer control) handshake over initial TCP socket to | |
6 | * prepare for RDMA traffic | |
7 | * | |
8 | * Copyright IBM Corp. 2016 | |
9 | * | |
10 | * Author(s): Ursula Braun <ubraun@linux.vnet.ibm.com> | |
11 | */ | |
12 | ||
13 | #ifndef _SMC_CLC_H | |
14 | #define _SMC_CLC_H | |
15 | ||
16 | #include <rdma/ib_verbs.h> | |
17 | ||
18 | #include "smc.h" | |
19 | ||
20 | #define SMC_CLC_PROPOSAL 0x01 | |
21 | #define SMC_CLC_ACCEPT 0x02 | |
22 | #define SMC_CLC_CONFIRM 0x03 | |
23 | #define SMC_CLC_DECLINE 0x04 | |
24 | ||
a046d57d UB |
25 | #define SMC_CLC_V1 0x1 /* SMC version */ |
26 | #define CLC_WAIT_TIME (6 * HZ) /* max. wait time on clcsock */ | |
27 | #define SMC_CLC_DECL_MEM 0x01010000 /* insufficient memory resources */ | |
28 | #define SMC_CLC_DECL_TIMEOUT 0x02000000 /* timeout */ | |
29 | #define SMC_CLC_DECL_CNFERR 0x03000000 /* configuration error */ | |
30 | #define SMC_CLC_DECL_IPSEC 0x03030000 /* IPsec usage */ | |
31 | #define SMC_CLC_DECL_SYNCERR 0x04000000 /* synchronization error */ | |
32 | #define SMC_CLC_DECL_REPLY 0x06000000 /* reply to a received decline */ | |
33 | #define SMC_CLC_DECL_INTERR 0x99990000 /* internal error */ | |
9bf9abea UB |
34 | #define SMC_CLC_DECL_TCL 0x02040000 /* timeout w4 QP confirm */ |
35 | #define SMC_CLC_DECL_SEND 0x07000000 /* sending problem */ | |
75d320d6 | 36 | #define SMC_CLC_DECL_RMBE_EC 0x08000000 /* peer has eyecatcher in RMBE */ |
a046d57d UB |
37 | |
38 | struct smc_clc_msg_hdr { /* header1 of clc messages */ | |
39 | u8 eyecatcher[4]; /* eye catcher */ | |
40 | u8 type; /* proposal / accept / confirm / decline */ | |
41 | __be16 length; | |
42 | #if defined(__BIG_ENDIAN_BITFIELD) | |
43 | u8 version : 4, | |
44 | flag : 1, | |
e7b7a64a | 45 | rsvd : 3; |
a046d57d UB |
46 | #elif defined(__LITTLE_ENDIAN_BITFIELD) |
47 | u8 rsvd : 3, | |
48 | flag : 1, | |
49 | version : 4; | |
50 | #endif | |
51 | } __packed; /* format defined in RFC7609 */ | |
52 | ||
53 | struct smc_clc_msg_trail { /* trailer of clc messages */ | |
54 | u8 eyecatcher[4]; | |
55 | }; | |
56 | ||
57 | struct smc_clc_msg_local { /* header2 of clc messages */ | |
58 | u8 id_for_peer[SMC_SYSTEMID_LEN]; /* unique system id */ | |
59 | u8 gid[16]; /* gid of ib_device port */ | |
60 | u8 mac[6]; /* mac of ib_device port */ | |
61 | }; | |
62 | ||
e7b7a64a UB |
63 | struct smc_clc_ipv6_prefix { |
64 | u8 prefix[4]; | |
65 | u8 prefix_len; | |
66 | } __packed; | |
67 | ||
68 | struct smc_clc_msg_proposal_prefix { /* prefix part of clc proposal message*/ | |
a046d57d UB |
69 | __be32 outgoing_subnet; /* subnet mask */ |
70 | u8 prefix_len; /* number of significant bits in mask */ | |
71 | u8 reserved[2]; | |
72 | u8 ipv6_prefixes_cnt; /* number of IPv6 prefixes in prefix array */ | |
a046d57d UB |
73 | } __aligned(4); |
74 | ||
e7b7a64a UB |
75 | struct smc_clc_msg_proposal { /* clc proposal message sent by Linux */ |
76 | struct smc_clc_msg_hdr hdr; | |
77 | struct smc_clc_msg_local lcl; | |
78 | __be16 iparea_offset; /* offset to IP address information area */ | |
79 | } __aligned(4); | |
80 | ||
81 | #define SMC_CLC_PROPOSAL_MAX_OFFSET 0x28 | |
82 | #define SMC_CLC_PROPOSAL_MAX_PREFIX (8 * sizeof(struct smc_clc_ipv6_prefix)) | |
83 | #define SMC_CLC_MAX_LEN (sizeof(struct smc_clc_msg_proposal) + \ | |
84 | SMC_CLC_PROPOSAL_MAX_OFFSET + \ | |
85 | SMC_CLC_PROPOSAL_MAX_PREFIX + \ | |
86 | sizeof(struct smc_clc_msg_trail)) | |
87 | ||
a046d57d UB |
88 | struct smc_clc_msg_accept_confirm { /* clc accept / confirm message */ |
89 | struct smc_clc_msg_hdr hdr; | |
90 | struct smc_clc_msg_local lcl; | |
91 | u8 qpn[3]; /* QP number */ | |
92 | __be32 rmb_rkey; /* RMB rkey */ | |
93 | u8 conn_idx; /* Connection index, which RMBE in RMB */ | |
94 | __be32 rmbe_alert_token;/* unique connection id */ | |
95 | #if defined(__BIG_ENDIAN_BITFIELD) | |
96 | u8 rmbe_size : 4, /* RMBE buf size (compressed notation) */ | |
97 | qp_mtu : 4; /* QP mtu */ | |
98 | #elif defined(__LITTLE_ENDIAN_BITFIELD) | |
99 | u8 qp_mtu : 4, | |
100 | rmbe_size : 4; | |
101 | #endif | |
102 | u8 reserved; | |
103 | __be64 rmb_dma_addr; /* RMB virtual address */ | |
104 | u8 reserved2; | |
105 | u8 psn[3]; /* initial packet sequence number */ | |
106 | struct smc_clc_msg_trail trl; /* eye catcher "SMCR" EBCDIC */ | |
107 | } __packed; /* format defined in RFC7609 */ | |
108 | ||
109 | struct smc_clc_msg_decline { /* clc decline message */ | |
110 | struct smc_clc_msg_hdr hdr; | |
111 | u8 id_for_peer[SMC_SYSTEMID_LEN]; /* sender peer_id */ | |
112 | __be32 peer_diagnosis; /* diagnosis information */ | |
113 | u8 reserved2[4]; | |
114 | struct smc_clc_msg_trail trl; /* eye catcher "SMCR" EBCDIC */ | |
115 | } __aligned(4); | |
116 | ||
e7b7a64a UB |
117 | /* determine start of the prefix area within the proposal message */ |
118 | static inline struct smc_clc_msg_proposal_prefix * | |
119 | smc_clc_proposal_get_prefix(struct smc_clc_msg_proposal *pclc) | |
120 | { | |
121 | return (struct smc_clc_msg_proposal_prefix *) | |
122 | ((u8 *)pclc + sizeof(*pclc) + ntohs(pclc->iparea_offset)); | |
123 | } | |
124 | ||
c246d942 KG |
125 | int smc_clc_prfx_match(struct socket *clcsock, |
126 | struct smc_clc_msg_proposal_prefix *prop); | |
a046d57d UB |
127 | int smc_clc_wait_msg(struct smc_sock *smc, void *buf, int buflen, |
128 | u8 expected_type); | |
bfbedfd3 | 129 | int smc_clc_send_decline(struct smc_sock *smc, u32 peer_diag_info); |
a046d57d UB |
130 | int smc_clc_send_proposal(struct smc_sock *smc, struct smc_ib_device *smcibdev, |
131 | u8 ibport); | |
132 | int smc_clc_send_confirm(struct smc_sock *smc); | |
0cfdd8f9 | 133 | int smc_clc_send_accept(struct smc_sock *smc, int srv_first_contact); |
a046d57d UB |
134 | |
135 | #endif |