diff options
Diffstat (limited to 'net/smc/smc_clc.h')
| -rw-r--r-- | net/smc/smc_clc.h | 114 |
1 files changed, 114 insertions, 0 deletions
diff --git a/net/smc/smc_clc.h b/net/smc/smc_clc.h new file mode 100644 index 000000000000..60bfc8bd8d89 --- /dev/null +++ b/net/smc/smc_clc.h @@ -0,0 +1,114 @@ +/* + * 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 + +/* eye catcher "SMCR" EBCDIC for CLC messages */ +static const char SMC_EYECATCHER[4] = {'\xe2', '\xd4', '\xc3', '\xd9'}; + +#define SMC_CLC_V1 0x1 /* SMC version */ +#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 0x02000000 /* timeout */ +#define SMC_CLC_DECL_CNFERR 0x03000000 /* configuration error */ +#define SMC_CLC_DECL_IPSEC 0x03030000 /* IPsec usage */ +#define SMC_CLC_DECL_SYNCERR 0x04000000 /* synchronization error */ +#define SMC_CLC_DECL_REPLY 0x06000000 /* reply to a received decline */ +#define SMC_CLC_DECL_INTERR 0x99990000 /* internal error */ + +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 : 3; +#elif defined(__LITTLE_ENDIAN_BITFIELD) + u8 rsvd : 3, + 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 */ +}; + +struct smc_clc_msg_proposal { /* clc proposal message */ + struct smc_clc_msg_hdr hdr; + struct smc_clc_msg_local lcl; + __be16 iparea_offset; /* offset to IP address information area */ + __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 */ + struct smc_clc_msg_trail trl; /* eye catcher "SMCR" EBCDIC */ +} __aligned(4); + +struct smc_clc_msg_accept_confirm { /* clc accept / confirm message */ + struct smc_clc_msg_hdr hdr; + struct smc_clc_msg_local lcl; + u8 qpn[3]; /* QP number */ + __be32 rmb_rkey; /* RMB rkey */ + u8 conn_idx; /* Connection index, which RMBE in RMB */ + __be32 rmbe_alert_token;/* unique connection id */ +#if defined(__BIG_ENDIAN_BITFIELD) + u8 rmbe_size : 4, /* RMBE buf size (compressed notation) */ + 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]; /* initial packet sequence number */ + struct smc_clc_msg_trail trl; /* eye catcher "SMCR" EBCDIC */ +} __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); + +struct smc_sock; +struct smc_ib_device; + +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, + u8 out_of_sync); +int smc_clc_send_proposal(struct smc_sock *smc, struct smc_ib_device *smcibdev, + u8 ibport); +int smc_clc_send_confirm(struct smc_sock *smc); +int smc_clc_send_accept(struct smc_sock *smc); + +#endif |