/* SPDX-License-Identifier: GPL-2.0 */ /* * Shared Memory Communications over RDMA (SMC-R) and RoCE * * CLC (connection layer control) handshake over initial TCP socket to * prepare for RDMA traffic * * Copyright IBM Corp. 2016 * * Author(s): Ursula Braun */ #ifndef _SMC_CLC_H #define _SMC_CLC_H #include #include "smc.h" #define SMC_CLC_PROPOSAL 0x01 #define SMC_CLC_ACCEPT 0x02 #define SMC_CLC_CONFIRM 0x03 #define SMC_CLC_DECLINE 0x04 #define SMC_CLC_V1 0x1 /* SMC version */ #define SMC_TYPE_R 0 /* SMC-R only */ #define SMC_TYPE_D 1 /* SMC-D only */ #define SMC_TYPE_B 3 /* SMC-R and SMC-D */ #define CLC_WAIT_TIME (6 * HZ) /* max. wait time on clcsock */ #define CLC_WAIT_TIME_SHORT HZ /* short wait time on clcsock */ #define SMC_CLC_DECL_MEM 0x01010000 /* insufficient memory resources */ #define SMC_CLC_DECL_TIMEOUT_CL 0x02010000 /* timeout w4 QP confirm link */ #define SMC_CLC_DECL_TIMEOUT_AL 0x02020000 /* timeout w4 QP add link */ #define SMC_CLC_DECL_CNFERR 0x03000000 /* configuration error */ #define SMC_CLC_DECL_PEERNOSMC 0x03010000 /* peer did not indicate SMC */ #define SMC_CLC_DECL_IPSEC 0x03020000 /* IPsec usage */ #define SMC_CLC_DECL_NOSMCDEV 0x03030000 /* no SMC device found (R or D) */ #define SMC_CLC_DECL_NOSMCDDEV 0x03030001 /* no SMC-D device found */ #define SMC_CLC_DECL_NOSMCRDEV 0x03030002 /* no SMC-R device found */ #define SMC_CLC_DECL_SMCDNOTALK 0x03030003 /* SMC-D dev can't talk to peer */ #define SMC_CLC_DECL_MODEUNSUPP 0x03040000 /* smc modes do not match (R or D)*/ #define SMC_CLC_DECL_RMBE_EC 0x03050000 /* peer has eyecatcher in RMBE */ #define SMC_CLC_DECL_OPTUNSUPP 0x03060000 /* fastopen sockopt not supported */ #define SMC_CLC_DECL_DIFFPREFIX 0x03070000 /* IP prefix / subnet mismatch */ #define SMC_CLC_DECL_GETVLANERR 0x03080000 /* err to get vlan id of ip device*/ #define SMC_CLC_DECL_ISMVLANERR 0x03090000 /* err to reg vlan id on ism dev */ #define SMC_CLC_DECL_SYNCERR 0x04000000 /* synchronization error */ #define SMC_CLC_DECL_PEERDECL 0x05000000 /* peer declined during handshake */ #define SMC_CLC_DECL_INTERR 0x09990000 /* internal error */ #define SMC_CLC_DECL_ERR_RTOK 0x09990001 /* rtoken handling failed */ #define SMC_CLC_DECL_ERR_RDYLNK 0x09990002 /* ib ready link failed */ #define SMC_CLC_DECL_ERR_REGRMB 0x09990003 /* reg rmb failed */ struct smc_clc_msg_hdr { /* header1 of clc messages */ u8 eyecatcher[4]; /* eye catcher */ u8 type; /* proposal / accept / confirm / decline */ __be16 length; #if defined(__BIG_ENDIAN_BITFIELD) u8 version : 4, flag : 1, rsvd : 1, path : 2; #elif defined(__LITTLE_ENDIAN_BITFIELD) u8 path : 2, rsvd : 1, flag : 1, version : 4; #endif } __packed; /* format defined in RFC7609 */ struct smc_clc_msg_trail { /* trailer of clc messages */ u8 eyecatcher[4]; }; struct smc_clc_msg_local { /* header2 of clc messages */ u8 id_for_peer[SMC_SYSTEMID_LEN]; /* unique system id */ u8 gid[16]; /* gid of ib_device port */ u8 mac[6]; /* mac of ib_device port */ }; #define SMC_CLC_MAX_V6_PREFIX 8 /* Struct would be 4 byte aligned, but it is used in an array that is sent * to peers and must conform to RFC7609, hence we need to use packed here. */ struct smc_clc_ipv6_prefix { struct in6_addr prefix; u8 prefix_len; } __packed; /* format defined in RFC7609 */ struct smc_clc_msg_proposal_prefix { /* prefix part of clc proposal message*/ __be32 outgoing_subnet; /* subnet mask */ u8 prefix_len; /* number of significant bits in mask */ u8 reserved[2]; u8 ipv6_prefixes_cnt; /* number of IPv6 prefixes in prefix array */ } __aligned(4); struct smc_clc_msg_smcd { /* SMC-D GID information */ u64 gid; /* ISM GID of requestor */ u8 res[32]; }; struct smc_clc_msg_proposal { /* clc proposal message sent by Linux */ struct smc_clc_msg_hdr hdr; struct smc_clc_msg_local lcl; __be16 iparea_offset; /* offset to IP address information area */ } __aligned(4); #define SMC_CLC_PROPOSAL_MAX_OFFSET 0x28 #define SMC_CLC_PROPOSAL_MAX_PREFIX (SMC_CLC_MAX_V6_PREFIX * \ sizeof(struct smc_clc_ipv6_prefix)) #define SMC_CLC_MAX_LEN (sizeof(struct smc_clc_msg_proposal) + \ SMC_CLC_PROPOSAL_MAX_OFFSET + \ sizeof(struct smc_clc_msg_proposal_prefix) + \ SMC_CLC_PROPOSAL_MAX_PREFIX + \ sizeof(struct smc_clc_msg_trail)) struct smc_clc_msg_accept_confirm { /* clc accept / confirm message */ struct smc_clc_msg_hdr hdr; union { struct { /* SMC-R */ struct smc_clc_msg_local lcl; u8 qpn[3]; /* QP number */ __be32 rmb_rkey; /* RMB rkey */ u8 rmbe_idx; /* Index of RMBE in RMB */ __be32 rmbe_alert_token;/* unique connection id */ #if defined(__BIG_ENDIAN_BITFIELD) u8 rmbe_size : 4, /* buf size (compressed) */ qp_mtu : 4; /* QP mtu */ #elif defined(__LITTLE_ENDIAN_BITFIELD) u8 qp_mtu : 4, rmbe_size : 4; #endif u8 reserved; __be64 rmb_dma_addr; /* RMB virtual address */ u8 reserved2; u8 psn[3]; /* packet sequence number */ struct smc_clc_msg_trail smcr_trl; /* eye catcher "SMCR" EBCDIC */ } __packed; struct { /* SMC-D */ u64 gid; /* Sender GID */ u64 token; /* DMB token */ u8 dmbe_idx; /* DMBE index */ #if defined(__BIG_ENDIAN_BITFIELD) u8 dmbe_size : 4, /* buf size (compressed) */ reserved3 : 4; #elif defined(__LITTLE_ENDIAN_BITFIELD) u8 reserved3 : 4, dmbe_size : 4; #endif u16 reserved4; u32 linkid; /* Link identifier */ u32 reserved5[3]; struct smc_clc_msg_trail smcd_trl; /* eye catcher "SMCD" EBCDIC */ } __packed; }; } __packed; /* format defined in RFC7609 */ struct smc_clc_msg_decline { /* clc decline message */ struct smc_clc_msg_hdr hdr; u8 id_for_peer[SMC_SYSTEMID_LEN]; /* sender peer_id */ __be32 peer_diagnosis; /* diagnosis information */ u8 reserved2[4]; struct smc_clc_msg_trail trl; /* eye catcher "SMCR" EBCDIC */ } __aligned(4); /* determine start of the prefix area within the proposal message */ static inline struct smc_clc_msg_proposal_prefix * smc_clc_proposal_get_prefix(struct smc_clc_msg_proposal *pclc) { return (struct smc_clc_msg_proposal_prefix *) ((u8 *)pclc + sizeof(*pclc) + ntohs(pclc->iparea_offset)); } /* get SMC-D info from proposal message */ static inline struct smc_clc_msg_smcd * smc_get_clc_msg_smcd(struct smc_clc_msg_proposal *prop) { if (ntohs(prop->iparea_offset) != sizeof(struct smc_clc_msg_smcd)) return NULL; return (struct smc_clc_msg_smcd *)(prop + 1); } struct smcd_dev; struct smc_init_info; int smc_clc_prfx_match(struct socket *clcsock, struct smc_clc_msg_proposal_prefix *prop); int smc_clc_wait_msg(struct smc_sock *smc, void *buf, int buflen, u8 expected_type, unsigned long timeout); int smc_clc_send_decline(struct smc_sock *smc, u32 peer_diag_info); int smc_clc_send_proposal(struct smc_sock *smc, int smc_type, struct smc_init_info *ini); int smc_clc_send_confirm(struct smc_sock *smc); int smc_clc_send_accept(struct smc_sock *smc, int srv_first_contact); #endif