7eb4f66b38
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>
65 lines
1.3 KiB
C
65 lines
1.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/bpf.h>
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#include <bpf/bpf_helpers.h>
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char _license[] SEC("license") = "GPL";
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struct tcp_rtt_storage {
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__u32 invoked;
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__u32 dsack_dups;
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__u32 delivered;
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__u32 delivered_ce;
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__u32 icsk_retransmits;
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__u32 mrtt_us; /* args[0] */
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__u32 srtt; /* args[1] */
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};
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struct {
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__uint(type, BPF_MAP_TYPE_SK_STORAGE);
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__uint(map_flags, BPF_F_NO_PREALLOC);
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__type(key, int);
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__type(value, struct tcp_rtt_storage);
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} socket_storage_map SEC(".maps");
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SEC("sockops")
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int _sockops(struct bpf_sock_ops *ctx)
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{
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struct tcp_rtt_storage *storage;
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struct bpf_tcp_sock *tcp_sk;
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int op = (int) ctx->op;
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struct bpf_sock *sk;
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sk = ctx->sk;
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if (!sk)
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return 1;
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storage = bpf_sk_storage_get(&socket_storage_map, sk, 0,
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BPF_SK_STORAGE_GET_F_CREATE);
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if (!storage)
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return 1;
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if (op == BPF_SOCK_OPS_TCP_CONNECT_CB) {
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bpf_sock_ops_cb_flags_set(ctx, BPF_SOCK_OPS_RTT_CB_FLAG);
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return 1;
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}
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if (op != BPF_SOCK_OPS_RTT_CB)
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return 1;
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tcp_sk = bpf_tcp_sock(sk);
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if (!tcp_sk)
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return 1;
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storage->invoked++;
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storage->dsack_dups = tcp_sk->dsack_dups;
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storage->delivered = tcp_sk->delivered;
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storage->delivered_ce = tcp_sk->delivered_ce;
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storage->icsk_retransmits = tcp_sk->icsk_retransmits;
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storage->mrtt_us = ctx->args[0];
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storage->srtt = ctx->args[1];
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return 1;
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}
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