206 lines
7.4 KiB
C
206 lines
7.4 KiB
C
/* 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_N 2 /* neither SMC-R nor SMC-D */
|
|
#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_NOACTLINK 0x030a0000 /* no active smc-r link in lgr */
|
|
#define SMC_CLC_DECL_NOSRVLINK 0x030b0000 /* SMC-R link from srv not found */
|
|
#define SMC_CLC_DECL_VERSMISMAT 0x030c0000 /* SMC version mismatch */
|
|
#define SMC_CLC_DECL_MAX_DMB 0x030d0000 /* SMC-D DMB limit exceeded */
|
|
#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
|