188 lines
6.1 KiB
C
188 lines
6.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Shared Memory Communications over RDMA (SMC-R) and RoCE
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*
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* CLC (connection layer control) handshake over initial TCP socket to
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* prepare for RDMA traffic
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*
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* Copyright IBM Corp. 2016
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*
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* Author(s): Ursula Braun <ubraun@linux.vnet.ibm.com>
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*/
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#ifndef _SMC_CLC_H
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#define _SMC_CLC_H
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#include <rdma/ib_verbs.h>
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#include "smc.h"
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#define SMC_CLC_PROPOSAL 0x01
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#define SMC_CLC_ACCEPT 0x02
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#define SMC_CLC_CONFIRM 0x03
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#define SMC_CLC_DECLINE 0x04
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#define SMC_CLC_V1 0x1 /* SMC version */
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#define SMC_TYPE_R 0 /* SMC-R only */
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#define SMC_TYPE_D 1 /* SMC-D only */
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#define SMC_TYPE_B 3 /* SMC-R and SMC-D */
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#define CLC_WAIT_TIME (6 * HZ) /* max. wait time on clcsock */
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#define SMC_CLC_DECL_MEM 0x01010000 /* insufficient memory resources */
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#define SMC_CLC_DECL_TIMEOUT 0x02000000 /* timeout */
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#define SMC_CLC_DECL_CNFERR 0x03000000 /* configuration error */
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#define SMC_CLC_DECL_IPSEC 0x03030000 /* IPsec usage */
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#define SMC_CLC_DECL_SYNCERR 0x04000000 /* synchronization error */
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#define SMC_CLC_DECL_REPLY 0x06000000 /* reply to a received decline */
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#define SMC_CLC_DECL_INTERR 0x99990000 /* internal error */
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#define SMC_CLC_DECL_TCL 0x02040000 /* timeout w4 QP confirm */
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#define SMC_CLC_DECL_SEND 0x07000000 /* sending problem */
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#define SMC_CLC_DECL_RMBE_EC 0x08000000 /* peer has eyecatcher in RMBE */
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struct smc_clc_msg_hdr { /* header1 of clc messages */
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u8 eyecatcher[4]; /* eye catcher */
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u8 type; /* proposal / accept / confirm / decline */
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__be16 length;
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#if defined(__BIG_ENDIAN_BITFIELD)
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u8 version : 4,
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flag : 1,
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rsvd : 1,
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path : 2;
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#elif defined(__LITTLE_ENDIAN_BITFIELD)
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u8 path : 2,
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rsvd : 1,
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flag : 1,
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version : 4;
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#endif
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} __packed; /* format defined in RFC7609 */
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struct smc_clc_msg_trail { /* trailer of clc messages */
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u8 eyecatcher[4];
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};
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struct smc_clc_msg_local { /* header2 of clc messages */
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u8 id_for_peer[SMC_SYSTEMID_LEN]; /* unique system id */
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u8 gid[16]; /* gid of ib_device port */
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u8 mac[6]; /* mac of ib_device port */
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};
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#define SMC_CLC_MAX_V6_PREFIX 8
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/* Struct would be 4 byte aligned, but it is used in an array that is sent
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* to peers and must conform to RFC7609, hence we need to use packed here.
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*/
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struct smc_clc_ipv6_prefix {
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struct in6_addr prefix;
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u8 prefix_len;
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} __packed; /* format defined in RFC7609 */
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struct smc_clc_msg_proposal_prefix { /* prefix part of clc proposal message*/
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__be32 outgoing_subnet; /* subnet mask */
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u8 prefix_len; /* number of significant bits in mask */
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u8 reserved[2];
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u8 ipv6_prefixes_cnt; /* number of IPv6 prefixes in prefix array */
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} __aligned(4);
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struct smc_clc_msg_smcd { /* SMC-D GID information */
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u64 gid; /* ISM GID of requestor */
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u8 res[32];
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};
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struct smc_clc_msg_proposal { /* clc proposal message sent by Linux */
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struct smc_clc_msg_hdr hdr;
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struct smc_clc_msg_local lcl;
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__be16 iparea_offset; /* offset to IP address information area */
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} __aligned(4);
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#define SMC_CLC_PROPOSAL_MAX_OFFSET 0x28
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#define SMC_CLC_PROPOSAL_MAX_PREFIX (SMC_CLC_MAX_V6_PREFIX * \
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sizeof(struct smc_clc_ipv6_prefix))
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#define SMC_CLC_MAX_LEN (sizeof(struct smc_clc_msg_proposal) + \
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SMC_CLC_PROPOSAL_MAX_OFFSET + \
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sizeof(struct smc_clc_msg_proposal_prefix) + \
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SMC_CLC_PROPOSAL_MAX_PREFIX + \
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sizeof(struct smc_clc_msg_trail))
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struct smc_clc_msg_accept_confirm { /* clc accept / confirm message */
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struct smc_clc_msg_hdr hdr;
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union {
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struct { /* SMC-R */
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struct smc_clc_msg_local lcl;
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u8 qpn[3]; /* QP number */
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__be32 rmb_rkey; /* RMB rkey */
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u8 rmbe_idx; /* Index of RMBE in RMB */
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__be32 rmbe_alert_token;/* unique connection id */
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#if defined(__BIG_ENDIAN_BITFIELD)
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u8 rmbe_size : 4, /* buf size (compressed) */
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qp_mtu : 4; /* QP mtu */
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#elif defined(__LITTLE_ENDIAN_BITFIELD)
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u8 qp_mtu : 4,
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rmbe_size : 4;
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#endif
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u8 reserved;
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__be64 rmb_dma_addr; /* RMB virtual address */
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u8 reserved2;
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u8 psn[3]; /* packet sequence number */
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struct smc_clc_msg_trail smcr_trl;
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/* eye catcher "SMCR" EBCDIC */
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} __packed;
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struct { /* SMC-D */
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u64 gid; /* Sender GID */
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u64 token; /* DMB token */
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u8 dmbe_idx; /* DMBE index */
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#if defined(__BIG_ENDIAN_BITFIELD)
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u8 dmbe_size : 4, /* buf size (compressed) */
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reserved3 : 4;
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#elif defined(__LITTLE_ENDIAN_BITFIELD)
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u8 reserved3 : 4,
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dmbe_size : 4;
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#endif
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u16 reserved4;
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u32 linkid; /* Link identifier */
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u32 reserved5[3];
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struct smc_clc_msg_trail smcd_trl;
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/* eye catcher "SMCD" EBCDIC */
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} __packed;
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};
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} __packed; /* format defined in RFC7609 */
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struct smc_clc_msg_decline { /* clc decline message */
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struct smc_clc_msg_hdr hdr;
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u8 id_for_peer[SMC_SYSTEMID_LEN]; /* sender peer_id */
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__be32 peer_diagnosis; /* diagnosis information */
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u8 reserved2[4];
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struct smc_clc_msg_trail trl; /* eye catcher "SMCR" EBCDIC */
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} __aligned(4);
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/* determine start of the prefix area within the proposal message */
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static inline struct smc_clc_msg_proposal_prefix *
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smc_clc_proposal_get_prefix(struct smc_clc_msg_proposal *pclc)
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{
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return (struct smc_clc_msg_proposal_prefix *)
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((u8 *)pclc + sizeof(*pclc) + ntohs(pclc->iparea_offset));
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}
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/* get SMC-D info from proposal message */
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static inline struct smc_clc_msg_smcd *
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smc_get_clc_msg_smcd(struct smc_clc_msg_proposal *prop)
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{
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if (ntohs(prop->iparea_offset) != sizeof(struct smc_clc_msg_smcd))
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return NULL;
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return (struct smc_clc_msg_smcd *)(prop + 1);
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}
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struct smcd_dev;
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int smc_clc_prfx_match(struct socket *clcsock,
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struct smc_clc_msg_proposal_prefix *prop);
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int smc_clc_wait_msg(struct smc_sock *smc, void *buf, int buflen,
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u8 expected_type);
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int smc_clc_send_decline(struct smc_sock *smc, u32 peer_diag_info);
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int smc_clc_send_proposal(struct smc_sock *smc, int smc_type,
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struct smc_ib_device *smcibdev, u8 ibport,
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struct smcd_dev *ismdev);
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int smc_clc_send_confirm(struct smc_sock *smc);
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int smc_clc_send_accept(struct smc_sock *smc, int srv_first_contact);
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#endif
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