[PATCH net-next v2 5/6] bpf: enable bpf timestamping rx in TCP layer
From: Jason Xing <hidden>
Date: 2026-05-21 13:53:48
Also in:
bpf
Subsystem:
networking [general], networking [tcp], the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Neal Cardwell, Linus Torvalds
From: Jason Xing <kernelxing@tencent.com> Add two if statements to accurately isolate bpf timestamping and so timestamping. They can work respectively. As to so_timestamping, only add a loose condition via report flags to avoid duplicate strict checks that is done in tcp_recv_timestamp() and performance impact. If the loose condition is hit, tcp_recv_timestamp() is able to handle the exact case and doesn't hamper the existing timestamping feature. Make it work in TCP protocol. Signed-off-by: Jason Xing <kernelxing@tencent.com> --- net/ipv4/tcp.c | 10 ++++++++++ 1 file changed, 10 insertions(+)
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 21ece4c71612..7ad3561dc8cd 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c@@ -2353,6 +2353,16 @@ void tcp_recv_timestamp(struct msghdr *msg, const struct sock *sk, int new_tstamp = sock_flag(sk, SOCK_TSTAMP_NEW); u32 tsflags = READ_ONCE(sk->sk_tsflags); + if (cgroup_bpf_enabled(CGROUP_SOCK_OPS) && + SK_BPF_CB_FLAG_TEST(sk, SK_BPF_CB_RX_TIMESTAMPING)) + bpf_skops_rx_timestamping((struct sock *)sk, tss, + BPF_SOCK_OPS_TSTAMP_RCV_CB); + + if (!sock_flag(sk, SOCK_RCVTSTAMP) && + !(tsflags & SOF_TIMESTAMPING_SOFTWARE) && + !(tsflags & SOF_TIMESTAMPING_RAW_HARDWARE)) + return; + if (tss->ts[0]) { if (sock_flag(sk, SOCK_RCVTSTAMP)) { struct timespec64 tv = ktime_to_timespec64(tss->ts[0]);
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2.43.7