2 * Shared Memory Communications over RDMA (SMC-R) and RoCE
4 * CLC (connection layer control) handshake over initial TCP socket to
5 * prepare for RDMA traffic
7 * Copyright IBM Corp. 2016
9 * Author(s): Ursula Braun <ubraun@linux.vnet.ibm.com>
15 #include <rdma/ib_verbs.h>
19 #define SMC_CLC_PROPOSAL 0x01
20 #define SMC_CLC_ACCEPT 0x02
21 #define SMC_CLC_CONFIRM 0x03
22 #define SMC_CLC_DECLINE 0x04
24 /* eye catcher "SMCR" EBCDIC for CLC messages */
25 static const char SMC_EYECATCHER[4] = {'\xe2', '\xd4', '\xc3', '\xd9'};
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 */
37 struct smc_clc_msg_hdr { /* header1 of clc messages */
38 u8 eyecatcher[4]; /* eye catcher */
39 u8 type; /* proposal / accept / confirm / decline */
41 #if defined(__BIG_ENDIAN_BITFIELD)
45 #elif defined(__LITTLE_ENDIAN_BITFIELD)
50 } __packed; /* format defined in RFC7609 */
52 struct smc_clc_msg_trail { /* trailer of clc messages */
56 struct smc_clc_msg_local { /* header2 of clc messages */
57 u8 id_for_peer[SMC_SYSTEMID_LEN]; /* unique system id */
58 u8 gid[16]; /* gid of ib_device port */
59 u8 mac[6]; /* mac of ib_device port */
62 struct smc_clc_msg_proposal { /* clc proposal message */
63 struct smc_clc_msg_hdr hdr;
64 struct smc_clc_msg_local lcl;
65 __be16 iparea_offset; /* offset to IP address information area */
66 __be32 outgoing_subnet; /* subnet mask */
67 u8 prefix_len; /* number of significant bits in mask */
69 u8 ipv6_prefixes_cnt; /* number of IPv6 prefixes in prefix array */
70 struct smc_clc_msg_trail trl; /* eye catcher "SMCR" EBCDIC */
73 struct smc_clc_msg_accept_confirm { /* clc accept / confirm message */
74 struct smc_clc_msg_hdr hdr;
75 struct smc_clc_msg_local lcl;
76 u8 qpn[3]; /* QP number */
77 __be32 rmb_rkey; /* RMB rkey */
78 u8 conn_idx; /* Connection index, which RMBE in RMB */
79 __be32 rmbe_alert_token;/* unique connection id */
80 #if defined(__BIG_ENDIAN_BITFIELD)
81 u8 rmbe_size : 4, /* RMBE buf size (compressed notation) */
82 qp_mtu : 4; /* QP mtu */
83 #elif defined(__LITTLE_ENDIAN_BITFIELD)
88 __be64 rmb_dma_addr; /* RMB virtual address */
90 u8 psn[3]; /* initial packet sequence number */
91 struct smc_clc_msg_trail trl; /* eye catcher "SMCR" EBCDIC */
92 } __packed; /* format defined in RFC7609 */
94 struct smc_clc_msg_decline { /* clc decline message */
95 struct smc_clc_msg_hdr hdr;
96 u8 id_for_peer[SMC_SYSTEMID_LEN]; /* sender peer_id */
97 __be32 peer_diagnosis; /* diagnosis information */
99 struct smc_clc_msg_trail trl; /* eye catcher "SMCR" EBCDIC */
103 struct smc_ib_device;
105 int smc_clc_wait_msg(struct smc_sock *smc, void *buf, int buflen,
107 int smc_clc_send_decline(struct smc_sock *smc, u32 peer_diag_info,
109 int smc_clc_send_proposal(struct smc_sock *smc, struct smc_ib_device *smcibdev,
111 int smc_clc_send_confirm(struct smc_sock *smc);
112 int smc_clc_send_accept(struct smc_sock *smc);