1 /* SPDX-License-Identifier: GPL-2.0 */ 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 25 /* eye catcher "SMCR" EBCDIC for CLC messages */ 26 static const char SMC_EYECATCHER[4] = {'\xe2', '\xd4', '\xc3', '\xd9'}; 27 28 #define SMC_CLC_V1 0x1 /* SMC version */ 29 #define CLC_WAIT_TIME (6 * HZ) /* max. wait time on clcsock */ 30 #define SMC_CLC_DECL_MEM 0x01010000 /* insufficient memory resources */ 31 #define SMC_CLC_DECL_TIMEOUT 0x02000000 /* timeout */ 32 #define SMC_CLC_DECL_CNFERR 0x03000000 /* configuration error */ 33 #define SMC_CLC_DECL_IPSEC 0x03030000 /* IPsec usage */ 34 #define SMC_CLC_DECL_SYNCERR 0x04000000 /* synchronization error */ 35 #define SMC_CLC_DECL_REPLY 0x06000000 /* reply to a received decline */ 36 #define SMC_CLC_DECL_INTERR 0x99990000 /* internal error */ 37 #define SMC_CLC_DECL_TCL 0x02040000 /* timeout w4 QP confirm */ 38 #define SMC_CLC_DECL_SEND 0x07000000 /* sending problem */ 39 40 struct smc_clc_msg_hdr { /* header1 of clc messages */ 41 u8 eyecatcher[4]; /* eye catcher */ 42 u8 type; /* proposal / accept / confirm / decline */ 43 __be16 length; 44 #if defined(__BIG_ENDIAN_BITFIELD) 45 u8 version : 4, 46 flag : 1, 47 rsvd : 3; 48 #elif defined(__LITTLE_ENDIAN_BITFIELD) 49 u8 rsvd : 3, 50 flag : 1, 51 version : 4; 52 #endif 53 } __packed; /* format defined in RFC7609 */ 54 55 struct smc_clc_msg_trail { /* trailer of clc messages */ 56 u8 eyecatcher[4]; 57 }; 58 59 struct smc_clc_msg_local { /* header2 of clc messages */ 60 u8 id_for_peer[SMC_SYSTEMID_LEN]; /* unique system id */ 61 u8 gid[16]; /* gid of ib_device port */ 62 u8 mac[6]; /* mac of ib_device port */ 63 }; 64 65 struct smc_clc_msg_proposal { /* clc proposal message */ 66 struct smc_clc_msg_hdr hdr; 67 struct smc_clc_msg_local lcl; 68 __be16 iparea_offset; /* offset to IP address information area */ 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 */ 73 struct smc_clc_msg_trail trl; /* eye catcher "SMCR" EBCDIC */ 74 } __aligned(4); 75 76 struct smc_clc_msg_accept_confirm { /* clc accept / confirm message */ 77 struct smc_clc_msg_hdr hdr; 78 struct smc_clc_msg_local lcl; 79 u8 qpn[3]; /* QP number */ 80 __be32 rmb_rkey; /* RMB rkey */ 81 u8 conn_idx; /* Connection index, which RMBE in RMB */ 82 __be32 rmbe_alert_token;/* unique connection id */ 83 #if defined(__BIG_ENDIAN_BITFIELD) 84 u8 rmbe_size : 4, /* RMBE buf size (compressed notation) */ 85 qp_mtu : 4; /* QP mtu */ 86 #elif defined(__LITTLE_ENDIAN_BITFIELD) 87 u8 qp_mtu : 4, 88 rmbe_size : 4; 89 #endif 90 u8 reserved; 91 __be64 rmb_dma_addr; /* RMB virtual address */ 92 u8 reserved2; 93 u8 psn[3]; /* initial packet sequence number */ 94 struct smc_clc_msg_trail trl; /* eye catcher "SMCR" EBCDIC */ 95 } __packed; /* format defined in RFC7609 */ 96 97 struct smc_clc_msg_decline { /* clc decline message */ 98 struct smc_clc_msg_hdr hdr; 99 u8 id_for_peer[SMC_SYSTEMID_LEN]; /* sender peer_id */ 100 __be32 peer_diagnosis; /* diagnosis information */ 101 u8 reserved2[4]; 102 struct smc_clc_msg_trail trl; /* eye catcher "SMCR" EBCDIC */ 103 } __aligned(4); 104 105 struct smc_sock; 106 struct smc_ib_device; 107 108 int smc_clc_wait_msg(struct smc_sock *smc, void *buf, int buflen, 109 u8 expected_type); 110 int smc_clc_send_decline(struct smc_sock *smc, u32 peer_diag_info); 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