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Diffstat (limited to '')
| -rw-r--r-- | net/smc/smc_clc.h | 193 |
1 files changed, 193 insertions, 0 deletions
diff --git a/net/smc/smc_clc.h b/net/smc/smc_clc.h new file mode 100644 index 000000000..18da89b68 --- /dev/null +++ b/net/smc/smc_clc.h @@ -0,0 +1,193 @@ +/* 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 <ubraun@linux.vnet.ibm.com> + */ + +#ifndef _SMC_CLC_H +#define _SMC_CLC_H + +#include <rdma/ib_verbs.h> + +#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 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 */ +#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_SYNCERR 0x04000000 /* synchronization error */ +#define SMC_CLC_DECL_PEERDECL 0x05000000 /* peer declined during handshake */ +#define SMC_CLC_DECL_INTERR 0x99990000 /* internal error */ +#define SMC_CLC_DECL_ERR_RTOK 0x99990001 /* rtoken handling failed */ +#define SMC_CLC_DECL_ERR_RDYLNK 0x99990002 /* ib ready link failed */ +#define SMC_CLC_DECL_ERR_REGRMB 0x99990003 /* 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; + +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); +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_ib_device *smcibdev, u8 ibport, u8 gid[], + struct smcd_dev *ismdev); +int smc_clc_send_confirm(struct smc_sock *smc); +int smc_clc_send_accept(struct smc_sock *smc, int srv_first_contact); + +#endif |