selftests/bpf: Add XDP load-balancer benchmark driver

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Wire up the userspace side of the XDP load-balancer benchmark.

24 scenarios cover the full code-path matrix: TCP/UDP, IPv4/IPv6,
cross-AF encap, LRU hit/miss/diverse/cold, consistent-hash bypass,
SYN/RST flag handling, and early exits (unknown VIP, non-IP, ICMP,
fragments, IP options).

Before benchmarking each scenario validates correctness: the output
packet is compared byte-for-byte against a pre-built expected packet
and BPF map counters are checked against the expected values.

Usage:
  sudo ./bench -a -w3 -p1 xdp-lb --scenario tcp-v4-lru-hit
  sudo ./bench xdp-lb --list-scenarios

Signed-off-by: Puranjay Mohan <puranjay@kernel.org>
Link: https://lore.kernel.org/r/20260427232313.1582588-7-puranjay@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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Puranjay Mohan 2026-04-27 16:23:03 -07:00 • committed by Alexei Starovoitov

parent 4b4f222910

commit a4b5ba8187

3 changed files with 1119 additions and 0 deletions

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2

tools/testing/selftests/bpf/Makefile

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4

tools/testing/selftests/bpf/bench.c

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1113

tools/testing/selftests/bpf/benchs/bench_xdp_lb.c

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