334 lines
11 KiB
C
334 lines
11 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_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_N 2 /* neither SMC-R nor SMC-D */
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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 CLC_WAIT_TIME_SHORT HZ /* short 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_CL 0x02010000 /* timeout w4 QP confirm link */
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#define SMC_CLC_DECL_TIMEOUT_AL 0x02020000 /* timeout w4 QP add link */
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#define SMC_CLC_DECL_CNFERR 0x03000000 /* configuration error */
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#define SMC_CLC_DECL_PEERNOSMC 0x03010000 /* peer did not indicate SMC */
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#define SMC_CLC_DECL_IPSEC 0x03020000 /* IPsec usage */
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#define SMC_CLC_DECL_NOSMCDEV 0x03030000 /* no SMC device found (R or D) */
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#define SMC_CLC_DECL_NOSMCDDEV 0x03030001 /* no SMC-D device found */
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#define SMC_CLC_DECL_NOSMCRDEV 0x03030002 /* no SMC-R device found */
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#define SMC_CLC_DECL_MODEUNSUPP 0x03040000 /* smc modes do not match (R or D)*/
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#define SMC_CLC_DECL_RMBE_EC 0x03050000 /* peer has eyecatcher in RMBE */
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#define SMC_CLC_DECL_OPTUNSUPP 0x03060000 /* fastopen sockopt not supported */
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#define SMC_CLC_DECL_DIFFPREFIX 0x03070000 /* IP prefix / subnet mismatch */
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#define SMC_CLC_DECL_GETVLANERR 0x03080000 /* err to get vlan id of ip device*/
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#define SMC_CLC_DECL_ISMVLANERR 0x03090000 /* err to reg vlan id on ism dev */
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#define SMC_CLC_DECL_NOACTLINK 0x030a0000 /* no active smc-r link in lgr */
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#define SMC_CLC_DECL_NOSRVLINK 0x030b0000 /* SMC-R link from srv not found */
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#define SMC_CLC_DECL_VERSMISMAT 0x030c0000 /* SMC version mismatch */
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#define SMC_CLC_DECL_MAX_DMB 0x030d0000 /* SMC-D DMB limit exceeded */
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#define SMC_CLC_DECL_SYNCERR 0x04000000 /* synchronization error */
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#define SMC_CLC_DECL_PEERDECL 0x05000000 /* peer declined during handshake */
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#define SMC_CLC_DECL_INTERR 0x09990000 /* internal error */
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#define SMC_CLC_DECL_ERR_RTOK 0x09990001 /* rtoken handling failed */
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#define SMC_CLC_DECL_ERR_RDYLNK 0x09990002 /* ib ready link failed */
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#define SMC_CLC_DECL_ERR_REGRMB 0x09990003 /* reg rmb failed */
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#define SMC_FIRST_CONTACT_MASK 0b10 /* first contact bit within typev2 */
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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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typev2 : 2,
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typev1 : 2;
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#elif defined(__LITTLE_ENDIAN_BITFIELD)
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u8 typev1 : 2,
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typev2 : 2,
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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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/* 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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#if defined(__BIG_ENDIAN_BITFIELD)
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struct smc_clc_v2_flag {
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u8 release : 4,
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rsvd : 3,
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seid : 1;
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};
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#elif defined(__LITTLE_ENDIAN_BITFIELD)
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struct smc_clc_v2_flag {
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u8 seid : 1,
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rsvd : 3,
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release : 4;
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};
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#endif
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struct smc_clnt_opts_area_hdr {
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u8 eid_cnt; /* number of user defined EIDs */
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u8 ism_gid_cnt; /* number of ISMv2 GIDs */
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u8 reserved1;
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struct smc_clc_v2_flag flag;
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u8 reserved2[2];
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__be16 smcd_v2_ext_offset; /* SMC-Dv2 Extension Offset */
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};
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struct smc_clc_smcd_gid_chid {
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__be64 gid; /* ISM GID */
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__be16 chid; /* ISMv2 CHID */
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} __packed; /* format defined in
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* IBM Shared Memory Communications Version 2
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* (https://www.ibm.com/support/pages/node/6326337)
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*/
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struct smc_clc_v2_extension {
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struct smc_clnt_opts_area_hdr hdr;
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u8 roce[16]; /* RoCEv2 GID */
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u8 reserved[16];
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u8 user_eids[0][SMC_MAX_EID_LEN];
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};
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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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struct smc_clc_smcd_gid_chid ism; /* ISM native GID+CHID of requestor */
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__be16 v2_ext_offset; /* SMC Version 2 Extension Offset */
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u8 reserved[28];
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};
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struct smc_clc_smcd_v2_extension {
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u8 system_eid[SMC_MAX_EID_LEN];
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u8 reserved[16];
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struct smc_clc_smcd_gid_chid gidchid[0];
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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_MAX_V6_PREFIX 8
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struct smc_clc_msg_proposal_area {
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struct smc_clc_msg_proposal pclc_base;
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struct smc_clc_msg_smcd pclc_smcd;
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struct smc_clc_msg_proposal_prefix pclc_prfx;
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struct smc_clc_ipv6_prefix pclc_prfx_ipv6[SMC_CLC_MAX_V6_PREFIX];
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struct smc_clc_v2_extension pclc_v2_ext;
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struct smc_clc_smcd_v2_extension pclc_smcd_v2_ext;
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struct smc_clc_smcd_gid_chid pclc_gidchids[SMC_MAX_ISM_DEVS];
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struct smc_clc_msg_trail pclc_trl;
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};
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struct smcr_clc_msg_accept_confirm { /* SMCR accept/confirm */
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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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} __packed;
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struct smcd_clc_msg_accept_confirm_common { /* SMCD accept/confirm */
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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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__be32 linkid; /* Link identifier */
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} __packed;
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#define SMC_CLC_OS_ZOS 1
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#define SMC_CLC_OS_LINUX 2
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#define SMC_CLC_OS_AIX 3
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struct smc_clc_first_contact_ext {
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u8 reserved1;
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#if defined(__BIG_ENDIAN_BITFIELD)
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u8 os_type : 4,
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release : 4;
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#elif defined(__LITTLE_ENDIAN_BITFIELD)
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u8 release : 4,
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os_type : 4;
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#endif
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u8 reserved2[2];
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u8 hostname[SMC_MAX_HOSTNAME_LEN];
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};
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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 smcr_clc_msg_accept_confirm r0; /* SMC-R */
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struct { /* SMC-D */
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struct smcd_clc_msg_accept_confirm_common d0;
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u32 reserved5[3];
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};
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};
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} __packed; /* format defined in RFC7609 */
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struct smc_clc_msg_accept_confirm_v2 { /* clc accept / confirm message */
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struct smc_clc_msg_hdr hdr;
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union {
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struct smcr_clc_msg_accept_confirm r0; /* SMC-R */
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struct { /* SMC-D */
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struct smcd_clc_msg_accept_confirm_common d0;
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__be16 chid;
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u8 eid[SMC_MAX_EID_LEN];
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u8 reserved5[8];
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};
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};
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};
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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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#if defined(__BIG_ENDIAN_BITFIELD)
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u8 os_type : 4,
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reserved : 4;
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#elif defined(__LITTLE_ENDIAN_BITFIELD)
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u8 reserved : 4,
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os_type : 4;
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#endif
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u8 reserved2[3];
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struct smc_clc_msg_trail trl; /* eye catcher "SMCD" or "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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static inline bool smcr_indicated(int smc_type)
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{
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return smc_type == SMC_TYPE_R || smc_type == SMC_TYPE_B;
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}
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static inline bool smcd_indicated(int smc_type)
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{
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return smc_type == SMC_TYPE_D || smc_type == SMC_TYPE_B;
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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 (smcd_indicated(prop->hdr.typev1) &&
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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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static inline struct smc_clc_v2_extension *
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smc_get_clc_v2_ext(struct smc_clc_msg_proposal *prop)
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{
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struct smc_clc_msg_smcd *prop_smcd = smc_get_clc_msg_smcd(prop);
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if (!prop_smcd || !ntohs(prop_smcd->v2_ext_offset))
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return NULL;
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return (struct smc_clc_v2_extension *)
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((u8 *)prop_smcd +
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offsetof(struct smc_clc_msg_smcd, v2_ext_offset) +
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sizeof(prop_smcd->v2_ext_offset) +
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ntohs(prop_smcd->v2_ext_offset));
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}
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static inline struct smc_clc_smcd_v2_extension *
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smc_get_clc_smcd_v2_ext(struct smc_clc_v2_extension *prop_v2ext)
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{
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if (!prop_v2ext)
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return NULL;
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if (!ntohs(prop_v2ext->hdr.smcd_v2_ext_offset))
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return NULL;
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return (struct smc_clc_smcd_v2_extension *)
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((u8 *)prop_v2ext +
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offsetof(struct smc_clc_v2_extension, hdr) +
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offsetof(struct smc_clnt_opts_area_hdr, smcd_v2_ext_offset) +
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sizeof(prop_v2ext->hdr.smcd_v2_ext_offset) +
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ntohs(prop_v2ext->hdr.smcd_v2_ext_offset));
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}
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struct smcd_dev;
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struct smc_init_info;
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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, unsigned long timeout);
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int smc_clc_send_decline(struct smc_sock *smc, u32 peer_diag_info, u8 version);
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int smc_clc_send_proposal(struct smc_sock *smc, struct smc_init_info *ini);
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int smc_clc_send_confirm(struct smc_sock *smc, bool clnt_first_contact,
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u8 version);
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int smc_clc_send_accept(struct smc_sock *smc, bool srv_first_contact,
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u8 version);
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void smc_clc_init(void) __init;
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#endif
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