bpf: selftest: Test batching and bpf_(get|set)sockopt in bpf tcp iter

2021-07-23T23:45:17Z

This patch adds tests for the batching and bpf_(get|set)sockopt in bpf tcp iter. It first creates: a) 1 non SO_REUSEPORT listener in lhash2. b) 256 passive and active fds connected to the listener in (a). c) 256 SO_REUSEPORT listeners in one of the lhash2 bucket. The test sets all listeners and connections to bpf_cubic before running the bpf iter. The bpf iter then calls setsockopt(TCP_CONGESTION) to switch each listener and connection from bpf_cubic to bpf_dctcp. The bpf iter has a random_retry mode such that it can return EAGAIN to the usespace in the middle of a batch. Signed-off-by: Martin KaFai Lau Signed-off-by: Andrii Nakryiko Reviewed-by: Eric Dumazet Acked-by: Kuniyuki Iwashima Acked-by: Yonghong Song Link: https://lore.kernel.org/bpf/20210701200625.1036874-1-kafai@fb.com

kernel/tools/testing/selftests/bpf/progs/bpf_iter_setsockopt.c, branch linux-6.2.y

bpf: selftest: Test batching and bpf_(get|set)sockopt in bpf tcp iter