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linux/net/smc/smc_clc.h
Gustavo A. R. Silva 0a3e6939d4 net/smc: Use static_assert() to check struct sizes 
Commit 9748dbc9f2 ("net/smc: Avoid -Wflex-array-member-not-at-end
warnings") introduced tagged `struct smc_clc_v2_extension_fixed` and
`struct smc_clc_smcd_v2_extension_fixed`. We want to ensure that when
new members need to be added to the flexible structures, they are
always included within these tagged structs.

So, we use `static_assert()` to ensure that the memory layout for
both the flexible structure and the tagged struct is the same after
any changes.

Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Reviewed-by: Jan Karcher <jaka@linux.ibm.com>
Link: https://patch.msgid.link/ZrVBuiqFHAORpFxE@cute
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2024-08-12 18:41:42 -07:00

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/* 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 <linux/smc.h>
#include "smc.h"
#include "smc_netlink.h"
#define SMC_CLC_PROPOSAL 0x01
#define SMC_CLC_ACCEPT 0x02
#define SMC_CLC_CONFIRM 0x03
#define SMC_CLC_DECLINE 0x04
#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_NOISM2SUPP 0x03030003 /* hardware has no ISMv2 support */
#define SMC_CLC_DECL_NOV2EXT 0x03030004 /* peer sent no clc v2 extension */
#define SMC_CLC_DECL_NOV2DEXT 0x03030005 /* peer sent no clc SMC-Dv2 ext. */
#define SMC_CLC_DECL_NOSEID 0x03030006 /* peer sent no SEID */
#define SMC_CLC_DECL_NOSMCD2DEV 0x03030007 /* no SMC-Dv2 device found */
#define SMC_CLC_DECL_NOUEID 0x03030008 /* peer sent no UEID */
#define SMC_CLC_DECL_RELEASEERR 0x03030009 /* release version negotiate failed */
#define SMC_CLC_DECL_MAXCONNERR 0x0303000a /* max connections negotiate failed */
#define SMC_CLC_DECL_MAXLINKERR 0x0303000b /* max links negotiate failed */
#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_NOROUTE 0x030e0000 /* SMC-Rv2 conn. no route to peer */
#define SMC_CLC_DECL_NOINDIRECT 0x030f0000 /* SMC-Rv2 conn. indirect mismatch*/
#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_REGBUF 0x09990003 /* reg rdma bufs failed */
#define SMC_FIRST_CONTACT_MASK 0b10 /* first contact bit within typev2 */
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,
typev2 : 2,
typev1 : 2;
#elif defined(__LITTLE_ENDIAN_BITFIELD)
u8 typev1 : 2,
typev2 : 2,
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 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 */
#if defined(__BIG_ENDIAN_BITFIELD)
struct smc_clc_v2_flag {
u8 release : 4,
rsvd : 3,
seid : 1;
};
#elif defined(__LITTLE_ENDIAN_BITFIELD)
struct smc_clc_v2_flag {
u8 seid : 1,
rsvd : 3,
release : 4;
};
#endif
struct smc_clnt_opts_area_hdr {
u8 eid_cnt; /* number of user defined EIDs */
u8 ism_gid_cnt; /* number of ISMv2 GIDs */
u8 reserved1;
struct smc_clc_v2_flag flag;
u8 reserved2[2];
__be16 smcd_v2_ext_offset; /* SMC-Dv2 Extension Offset */
};
struct smc_clc_smcd_gid_chid {
__be64 gid; /* ISM GID */
__be16 chid; /* ISMv2 CHID */
} __packed; /* format defined in
* IBM Shared Memory Communications Version 2
* (https://www.ibm.com/support/pages/node/6326337)
*/
struct smc_clc_v2_extension {
/* New members must be added within the struct_group() macro below. */
struct_group_tagged(smc_clc_v2_extension_fixed, fixed,
struct smc_clnt_opts_area_hdr hdr;
u8 roce[16]; /* RoCEv2 GID */
u8 max_conns;
u8 max_links;
__be16 feature_mask;
u8 reserved[12];
);
u8 user_eids[][SMC_MAX_EID_LEN];
};
static_assert(offsetof(struct smc_clc_v2_extension, user_eids) == sizeof(struct smc_clc_v2_extension_fixed),
"struct member likely outside of struct_group_tagged()");
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 */
struct smc_clc_smcd_gid_chid ism; /* ISM native GID+CHID of requestor */
__be16 v2_ext_offset; /* SMC Version 2 Extension Offset */
u8 vendor_oui[3]; /* vendor organizationally unique identifier */
u8 vendor_exp_options[5];
u8 reserved[20];
};
struct smc_clc_smcd_v2_extension {
/* New members must be added within the struct_group() macro below. */
struct_group_tagged(smc_clc_smcd_v2_extension_fixed, fixed,
u8 system_eid[SMC_MAX_EID_LEN];
u8 reserved[16];
);
struct smc_clc_smcd_gid_chid gidchid[];
};
static_assert(offsetof(struct smc_clc_smcd_v2_extension, gidchid) == sizeof(struct smc_clc_smcd_v2_extension_fixed),
"struct member likely outside of struct_group_tagged()");
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_MAX_V6_PREFIX 8
#define SMC_CLC_MAX_UEID 8
#define SMCD_CLC_MAX_V2_GID_ENTRIES 8 /* max # of CHID-GID entries in CLC
* proposal SMC-Dv2 extension.
* each ISM device takes one entry and
* each Emulated-ISM takes two entries
*/
struct smc_clc_msg_proposal_area {
struct smc_clc_msg_proposal pclc_base;
struct smc_clc_msg_smcd pclc_smcd;
struct smc_clc_msg_proposal_prefix pclc_prfx;
struct smc_clc_ipv6_prefix pclc_prfx_ipv6[SMC_CLC_MAX_V6_PREFIX];
struct smc_clc_v2_extension_fixed pclc_v2_ext;
u8 user_eids[SMC_CLC_MAX_UEID][SMC_MAX_EID_LEN];
struct smc_clc_smcd_v2_extension_fixed pclc_smcd_v2_ext;
struct smc_clc_smcd_gid_chid
pclc_gidchids[SMCD_CLC_MAX_V2_GID_ENTRIES];
struct smc_clc_msg_trail pclc_trl;
};
struct smcr_clc_msg_accept_confirm { /* SMCR accept/confirm */
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 */
} __packed;
struct smcd_clc_msg_accept_confirm_common { /* SMCD accept/confirm */
__be64 gid; /* Sender GID */
__be64 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;
__be32 linkid; /* Link identifier */
} __packed;
#define SMC_CLC_OS_ZOS 1
#define SMC_CLC_OS_LINUX 2
#define SMC_CLC_OS_AIX 3
struct smc_clc_first_contact_ext {
#if defined(__BIG_ENDIAN_BITFIELD)
u8 v2_direct : 1,
reserved : 7;
u8 os_type : 4,
release : 4;
#elif defined(__LITTLE_ENDIAN_BITFIELD)
u8 reserved : 7,
v2_direct : 1;
u8 release : 4,
os_type : 4;
#endif
u8 reserved2[2];
u8 hostname[SMC_MAX_HOSTNAME_LEN];
};
struct smc_clc_first_contact_ext_v2x {
struct smc_clc_first_contact_ext fce_v2_base;
union {
struct {
u8 max_conns; /* for SMC-R only */
u8 max_links; /* for SMC-R only */
};
u8 reserved3[2]; /* for SMC-D only */
};
__be16 feature_mask;
__be32 vendor_exp_options;
u8 reserved4[8];
} __packed; /* format defined in
* IBM Shared Memory Communications Version 2 (Third Edition)
* (https://www.ibm.com/support/pages/node/7009315)
*/
struct smc_clc_fce_gid_ext {
u8 gid_cnt;
u8 reserved2[3];
u8 gid[][SMC_GID_SIZE];
};
struct smc_clc_msg_accept_confirm { /* clc accept / confirm message */
struct smc_clc_msg_hdr hdr;
union {
struct { /* SMC-R */
struct smcr_clc_msg_accept_confirm r0;
struct { /* v2 only */
u8 eid[SMC_MAX_EID_LEN];
u8 reserved6[8];
} __packed r1;
};
struct { /* SMC-D */
struct smcd_clc_msg_accept_confirm_common d0;
struct { /* v2 only, but 12 bytes reserved in v1 */
__be16 chid;
u8 eid[SMC_MAX_EID_LEN];
__be64 gid_ext;
} __packed d1;
};
};
};
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 */
#if defined(__BIG_ENDIAN_BITFIELD)
u8 os_type : 4,
reserved : 4;
#elif defined(__LITTLE_ENDIAN_BITFIELD)
u8 reserved : 4,
os_type : 4;
#endif
u8 reserved2[3];
struct smc_clc_msg_trail trl; /* eye catcher "SMCD" or "SMCR" EBCDIC */
} __aligned(4);
#define SMC_DECL_DIAG_COUNT_V2 4 /* no. of additional peer diagnosis codes */
struct smc_clc_msg_decline_v2 { /* clc decline message */
struct smc_clc_msg_hdr hdr;
u8 id_for_peer[SMC_SYSTEMID_LEN]; /* sender peer_id */
__be32 peer_diagnosis; /* diagnosis information */
#if defined(__BIG_ENDIAN_BITFIELD)
u8 os_type : 4,
reserved : 4;
#elif defined(__LITTLE_ENDIAN_BITFIELD)
u8 reserved : 4,
os_type : 4;
#endif
u8 reserved2[3];
__be32 peer_diagnosis_v2[SMC_DECL_DIAG_COUNT_V2];
struct smc_clc_msg_trail trl; /* eye catcher "SMCD" or "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));
}
static inline bool smcr_indicated(int smc_type)
{
return smc_type == SMC_TYPE_R || smc_type == SMC_TYPE_B;
}
static inline bool smcd_indicated(int smc_type)
{
return smc_type == SMC_TYPE_D || smc_type == SMC_TYPE_B;
}
static inline u8 smc_indicated_type(int is_smcd, int is_smcr)
{
if (is_smcd && is_smcr)
return SMC_TYPE_B;
if (is_smcd)
return SMC_TYPE_D;
if (is_smcr)
return SMC_TYPE_R;
return SMC_TYPE_N;
}
/* 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 (smcd_indicated(prop->hdr.typev1) &&
ntohs(prop->iparea_offset) != sizeof(struct smc_clc_msg_smcd))
return NULL;
return (struct smc_clc_msg_smcd *)(prop + 1);
}
static inline struct smc_clc_v2_extension *
smc_get_clc_v2_ext(struct smc_clc_msg_proposal *prop)
{
struct smc_clc_msg_smcd *prop_smcd = smc_get_clc_msg_smcd(prop);
if (!prop_smcd || !ntohs(prop_smcd->v2_ext_offset))
return NULL;
return (struct smc_clc_v2_extension *)
((u8 *)prop_smcd +
offsetof(struct smc_clc_msg_smcd, v2_ext_offset) +
sizeof(prop_smcd->v2_ext_offset) +
ntohs(prop_smcd->v2_ext_offset));
}
static inline struct smc_clc_smcd_v2_extension *
smc_get_clc_smcd_v2_ext(struct smc_clc_v2_extension *prop_v2ext)
{
if (!prop_v2ext)
return NULL;
if (!ntohs(prop_v2ext->hdr.smcd_v2_ext_offset))
return NULL;
return (struct smc_clc_smcd_v2_extension *)
((u8 *)prop_v2ext +
offsetof(struct smc_clc_v2_extension, hdr) +
offsetof(struct smc_clnt_opts_area_hdr, smcd_v2_ext_offset) +
sizeof(prop_v2ext->hdr.smcd_v2_ext_offset) +
ntohs(prop_v2ext->hdr.smcd_v2_ext_offset));
}
static inline struct smc_clc_first_contact_ext *
smc_get_clc_first_contact_ext(struct smc_clc_msg_accept_confirm *clc,
bool is_smcd)
{
int clc_v2_len;
if (clc->hdr.version == SMC_V1 ||
!(clc->hdr.typev2 & SMC_FIRST_CONTACT_MASK))
return NULL;
if (is_smcd)
clc_v2_len =
offsetofend(struct smc_clc_msg_accept_confirm, d1);
else
clc_v2_len =
offsetofend(struct smc_clc_msg_accept_confirm, r1);
return (struct smc_clc_first_contact_ext *)(((u8 *)clc) + clc_v2_len);
}
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, u8 version);
int smc_clc_send_proposal(struct smc_sock *smc, struct smc_init_info *ini);
int smc_clc_send_confirm(struct smc_sock *smc, bool clnt_first_contact,
u8 version, u8 *eid, struct smc_init_info *ini);
int smc_clc_send_accept(struct smc_sock *smc, bool srv_first_contact,
u8 version, u8 *negotiated_eid, struct smc_init_info *ini);
int smc_clc_srv_v2x_features_validate(struct smc_sock *smc,
struct smc_clc_msg_proposal *pclc,
struct smc_init_info *ini);
int smc_clc_clnt_v2x_features_validate(struct smc_clc_first_contact_ext *fce,
struct smc_init_info *ini);
int smc_clc_v2x_features_confirm_check(struct smc_clc_msg_accept_confirm *cclc,
struct smc_init_info *ini);
void smc_clc_init(void) __init;
void smc_clc_exit(void);
void smc_clc_get_hostname(u8 **host);
bool smc_clc_match_eid(u8 *negotiated_eid,
struct smc_clc_v2_extension *smc_v2_ext,
u8 *peer_eid, u8 *local_eid);
int smc_clc_ueid_count(void);
int smc_nl_dump_ueid(struct sk_buff *skb, struct netlink_callback *cb);
int smc_nl_add_ueid(struct sk_buff *skb, struct genl_info *info);
int smc_nl_remove_ueid(struct sk_buff *skb, struct genl_info *info);
int smc_nl_flush_ueid(struct sk_buff *skb, struct genl_info *info);
int smc_nl_dump_seid(struct sk_buff *skb, struct netlink_callback *cb);
int smc_nl_enable_seid(struct sk_buff *skb, struct genl_info *info);
int smc_nl_disable_seid(struct sk_buff *skb, struct genl_info *info);
#endif
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