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selftests/bpf: extend BPF_SOCK_OPS_RTT_CB test for srtt and mrtt_us

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Because srtt and mrtt_us are added as args in bpf_sock_ops at
BPF_SOCK_OPS_RTT_CB, a simple check is added to make sure they are both
non-zero.

$ ./test_progs -t tcp_rtt
  #373     tcp_rtt:OK
  Summary: 1/0 PASSED, 0 SKIPPED, 0 FAILED

Suggested-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Philo Lu <lulie@linux.alibaba.com>
Link: https://lore.kernel.org/r/20240425161724.73707-3-lulie@linux.alibaba.com
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
This commit is contained in:
Philo Lu 2024-04-26 00:17:24 +08:00 committed by Martin KaFai Lau
parent 48e2cd3e3d
commit 7eb4f66b38
2 changed files with 20 additions and 0 deletions
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14
tools/testing/selftests/bpf/prog_tests/tcp_rtt.c
View File

@ -10,6 +10,9 @@ struct tcp_rtt_storage {
__u32 delivered;
__u32 delivered_ce;
__u32 icsk_retransmits;
__u32 mrtt_us; /* args[0] */
__u32 srtt; /* args[1] */
};
static void send_byte(int fd)
@ -83,6 +86,17 @@ static int verify_sk(int map_fd, int client_fd, const char *msg, __u32 invoked,
err++;
}
/* Precise values of mrtt and srtt are unavailable, just make sure they are nonzero */
if (val.mrtt_us == 0) {
log_err("%s: unexpected bpf_tcp_sock.args[0] (mrtt_us) %u == 0", msg, val.mrtt_us);
err++;
}
if (val.srtt == 0) {
log_err("%s: unexpected bpf_tcp_sock.args[1] (srtt) %u == 0", msg, val.srtt);
err++;
}
return err;
}

6
tools/testing/selftests/bpf/progs/tcp_rtt.c
View File

@ -10,6 +10,9 @@ struct tcp_rtt_storage {
__u32 delivered;
__u32 delivered_ce;
__u32 icsk_retransmits;
__u32 mrtt_us; /* args[0] */
__u32 srtt; /* args[1] */
};
struct {
@ -55,5 +58,8 @@ int _sockops(struct bpf_sock_ops *ctx)
storage->delivered_ce = tcp_sk->delivered_ce;
storage->icsk_retransmits = tcp_sk->icsk_retransmits;
storage->mrtt_us = ctx->args[0];
storage->srtt = ctx->args[1];
return 1;
}