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 */ 36 #define SMC_CLC_DECL_TCL 0x02040000 /* timeout w4 QP confirm */ 37 #define SMC_CLC_DECL_SEND 0x07000000 /* sending problem */ 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); 114 int smc_clc_send_accept(struct smc_sock *smc, int srv_first_contact); 115 116 #endif 117