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selftests/bpf: Add XDP load-balancer common definitions

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Add the shared header for the XDP load-balancer benchmark.  This
defines the data structures used by both the BPF program and
userspace: flow_key, vip_definition, real_definition, and the
stats/control structures.

Also provides the encapsulation source-address helpers shared
between the BPF datapath (for encap) and userspace (for building
expected output packets used in validation).

Signed-off-by: Puranjay Mohan <puranjay@kernel.org>
Link: https://lore.kernel.org/r/20260427232313.1582588-5-puranjay@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Puranjay Mohan 2026-04-27 16:23:01 -07:00 committed by Alexei Starovoitov
parent dcf11479c2
commit 6b4003a7b3
1 changed files with 112 additions and 0 deletions
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112
tools/testing/selftests/bpf/xdp_lb_bench_common.h Normal file
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/* SPDX-License-Identifier: GPL-2.0 */
/* Copyright (c) 2026 Meta Platforms, Inc. and affiliates. */
#ifndef XDP_LB_BENCH_COMMON_H
#define XDP_LB_BENCH_COMMON_H
#define F_IPV6 (1 << 0)
#define F_LRU_BYPASS (1 << 1)
#define CH_RING_SIZE 65537 /* per-VIP consistent hash ring slots */
#define MAX_VIPS 16
#define CH_RINGS_SIZE (MAX_VIPS * CH_RING_SIZE)
#define MAX_REALS 512
#define DEFAULT_LRU_SIZE 100000 /* connection tracking cache size */
#define ONE_SEC 1000000000U /* 1 sec in nanosec */
#define MAX_CONN_RATE 100000000 /* high enough to never trigger in bench */
#define LRU_UDP_TIMEOUT 30000000000ULL /* 30 sec in nanosec */
#define PCKT_FRAGMENTED 0x3FFF
#define KNUTH_HASH_MULT 2654435761U
#define IPIP_V4_PREFIX 4268 /* 172.16/12 in network order */
#define IPIP_V6_PREFIX1 1 /* 0100::/64 (RFC 6666 discard) */
#define IPIP_V6_PREFIX2 0
#define IPIP_V6_PREFIX3 0
/* Stats indices (0..MAX_VIPS-1 are per-VIP packet/byte counters) */
#define STATS_LRU (MAX_VIPS + 0) /* v1: total VIP packets, v2: LRU misses */
#define STATS_XDP_TX (MAX_VIPS + 1)
#define STATS_XDP_PASS (MAX_VIPS + 2)
#define STATS_XDP_DROP (MAX_VIPS + 3)
#define STATS_NEW_CONN (MAX_VIPS + 4) /* v1: conn count, v2: last reset ts */
#define STATS_LRU_MISS (MAX_VIPS + 5) /* v1: TCP LRU misses */
#define STATS_SIZE (MAX_VIPS + 6)
#ifdef __BPF__
#define lb_htons(x) bpf_htons(x)
#define LB_INLINE static __always_inline
#else
#define lb_htons(x) htons(x)
#define LB_INLINE static inline
#endif
LB_INLINE __be32 create_encap_ipv4_src(__u16 port, __be32 src)
{
__u32 ip_suffix = lb_htons(port);
ip_suffix <<= 16;
ip_suffix ^= src;
return (0xFFFF0000 & ip_suffix) | IPIP_V4_PREFIX;
}
LB_INLINE void create_encap_ipv6_src(__u16 port, __be32 src, __be32 *saddr)
{
saddr[0] = IPIP_V6_PREFIX1;
saddr[1] = IPIP_V6_PREFIX2;
saddr[2] = IPIP_V6_PREFIX3;
saddr[3] = src ^ port;
}
struct flow_key {
union {
__be32 src;
__be32 srcv6[4];
};
union {
__be32 dst;
__be32 dstv6[4];
};
union {
__u32 ports;
__u16 port16[2];
};
__u8 proto;
__u8 pad[3];
};
struct vip_definition {
union {
__be32 vip;
__be32 vipv6[4];
};
__u16 port;
__u8 proto;
__u8 pad;
};
struct vip_meta {
__u32 flags;
__u32 vip_num;
};
struct real_pos_lru {
__u32 pos;
__u64 atime;
};
struct real_definition {
__be32 dst;
__be32 dstv6[4];
__u8 flags;
};
struct lb_stats {
__u64 v1;
__u64 v2;
};
struct ctl_value {
__u8 mac[6];
__u8 pad[2];
};
#endif /* XDP_LB_BENCH_COMMON_H */