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1 | /* |
2 | * Shared Memory Communications over RDMA (SMC-R) and RoCE | |
3 | * | |
4 | * CLC (connection layer control) handshake over initial TCP socket to | |
5 | * prepare for RDMA traffic | |
6 | * | |
7 | * Copyright IBM Corp. 2016 | |
8 | * | |
9 | * Author(s): Ursula Braun <ubraun@linux.vnet.ibm.com> | |
10 | */ | |
11 | ||
12 | #ifndef _SMC_CLC_H | |
13 | #define _SMC_CLC_H | |
14 | ||
15 | #include <rdma/ib_verbs.h> | |
16 | ||
17 | #include "smc.h" | |
18 | ||
19 | #define SMC_CLC_PROPOSAL 0x01 | |
20 | #define SMC_CLC_ACCEPT 0x02 | |
21 | #define SMC_CLC_CONFIRM 0x03 | |
22 | #define SMC_CLC_DECLINE 0x04 | |
23 | ||
24 | /* eye catcher "SMCR" EBCDIC for CLC messages */ | |
25 | static const char SMC_EYECATCHER[4] = {'\xe2', '\xd4', '\xc3', '\xd9'}; | |
26 | ||
27 | #define SMC_CLC_V1 0x1 /* SMC version */ | |
28 | #define CLC_WAIT_TIME (6 * HZ) /* max. wait time on clcsock */ | |
29 | #define SMC_CLC_DECL_MEM 0x01010000 /* insufficient memory resources */ | |
30 | #define SMC_CLC_DECL_TIMEOUT 0x02000000 /* timeout */ | |
31 | #define SMC_CLC_DECL_CNFERR 0x03000000 /* configuration error */ | |
32 | #define SMC_CLC_DECL_IPSEC 0x03030000 /* IPsec usage */ | |
33 | #define SMC_CLC_DECL_SYNCERR 0x04000000 /* synchronization error */ | |
34 | #define SMC_CLC_DECL_REPLY 0x06000000 /* reply to a received decline */ | |
35 | #define SMC_CLC_DECL_INTERR 0x99990000 /* internal error */ | |
9bf9abea UB |
36 | #define SMC_CLC_DECL_TCL 0x02040000 /* timeout w4 QP confirm */ |
37 | #define SMC_CLC_DECL_SEND 0x07000000 /* sending problem */ | |
a046d57d UB |
38 | |
39 | struct smc_clc_msg_hdr { /* header1 of clc messages */ | |
40 | u8 eyecatcher[4]; /* eye catcher */ | |
41 | u8 type; /* proposal / accept / confirm / decline */ | |
42 | __be16 length; | |
43 | #if defined(__BIG_ENDIAN_BITFIELD) | |
44 | u8 version : 4, | |
45 | flag : 1, | |
46 | rsvd : 3; | |
47 | #elif defined(__LITTLE_ENDIAN_BITFIELD) | |
48 | u8 rsvd : 3, | |
49 | flag : 1, | |
50 | version : 4; | |
51 | #endif | |
52 | } __packed; /* format defined in RFC7609 */ | |
53 | ||
54 | struct smc_clc_msg_trail { /* trailer of clc messages */ | |
55 | u8 eyecatcher[4]; | |
56 | }; | |
57 | ||
58 | struct smc_clc_msg_local { /* header2 of clc messages */ | |
59 | u8 id_for_peer[SMC_SYSTEMID_LEN]; /* unique system id */ | |
60 | u8 gid[16]; /* gid of ib_device port */ | |
61 | u8 mac[6]; /* mac of ib_device port */ | |
62 | }; | |
63 | ||
64 | struct smc_clc_msg_proposal { /* clc proposal message */ | |
65 | struct smc_clc_msg_hdr hdr; | |
66 | struct smc_clc_msg_local lcl; | |
67 | __be16 iparea_offset; /* offset to IP address information area */ | |
68 | __be32 outgoing_subnet; /* subnet mask */ | |
69 | u8 prefix_len; /* number of significant bits in mask */ | |
70 | u8 reserved[2]; | |
71 | u8 ipv6_prefixes_cnt; /* number of IPv6 prefixes in prefix array */ | |
72 | struct smc_clc_msg_trail trl; /* eye catcher "SMCR" EBCDIC */ | |
73 | } __aligned(4); | |
74 | ||
75 | struct smc_clc_msg_accept_confirm { /* clc accept / confirm message */ | |
76 | struct smc_clc_msg_hdr hdr; | |
77 | struct smc_clc_msg_local lcl; | |
78 | u8 qpn[3]; /* QP number */ | |
79 | __be32 rmb_rkey; /* RMB rkey */ | |
80 | u8 conn_idx; /* Connection index, which RMBE in RMB */ | |
81 | __be32 rmbe_alert_token;/* unique connection id */ | |
82 | #if defined(__BIG_ENDIAN_BITFIELD) | |
83 | u8 rmbe_size : 4, /* RMBE buf size (compressed notation) */ | |
84 | qp_mtu : 4; /* QP mtu */ | |
85 | #elif defined(__LITTLE_ENDIAN_BITFIELD) | |
86 | u8 qp_mtu : 4, | |
87 | rmbe_size : 4; | |
88 | #endif | |
89 | u8 reserved; | |
90 | __be64 rmb_dma_addr; /* RMB virtual address */ | |
91 | u8 reserved2; | |
92 | u8 psn[3]; /* initial packet sequence number */ | |
93 | struct smc_clc_msg_trail trl; /* eye catcher "SMCR" EBCDIC */ | |
94 | } __packed; /* format defined in RFC7609 */ | |
95 | ||
96 | struct smc_clc_msg_decline { /* clc decline message */ | |
97 | struct smc_clc_msg_hdr hdr; | |
98 | u8 id_for_peer[SMC_SYSTEMID_LEN]; /* sender peer_id */ | |
99 | __be32 peer_diagnosis; /* diagnosis information */ | |
100 | u8 reserved2[4]; | |
101 | struct smc_clc_msg_trail trl; /* eye catcher "SMCR" EBCDIC */ | |
102 | } __aligned(4); | |
103 | ||
104 | struct smc_sock; | |
105 | struct smc_ib_device; | |
106 | ||
107 | int smc_clc_wait_msg(struct smc_sock *smc, void *buf, int buflen, | |
108 | u8 expected_type); | |
109 | int smc_clc_send_decline(struct smc_sock *smc, u32 peer_diag_info, | |
110 | u8 out_of_sync); | |
111 | int smc_clc_send_proposal(struct smc_sock *smc, struct smc_ib_device *smcibdev, | |
112 | u8 ibport); | |
113 | int smc_clc_send_confirm(struct smc_sock *smc); | |
0cfdd8f9 | 114 | int smc_clc_send_accept(struct smc_sock *smc, int srv_first_contact); |
a046d57d UB |
115 | |
116 | #endif |