Commit 0325cbd2 authored May 01, 2024 by Miao Xu Committed by Martin KaFai Lau May 02, 2024

bpf: tcp: Allow to write tp->snd_cwnd_stamp in bpf_tcp_ca



This patch allows the write of tp->snd_cwnd_stamp in a bpf tcp
ca program. An use case of writing this field is to keep track
of the time whenever tp->snd_cwnd is raised or reduced inside
the `cong_control` callback.

Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Miao Xu <miaxu@meta.com>
Link: https://lore.kernel.org/r/20240502042318.801932-3-miaxu@meta.com


Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>

parent 57bfc760

net/ipv4/bpf_tcp_ca.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -107,6 +107,9 @@ static int bpf_tcp_ca_btf_struct_access(struct bpf_verifier_log *log,
		case offsetof(struct tcp_sock, snd_cwnd_cnt):
		end = offsetofend(struct tcp_sock, snd_cwnd_cnt);
		break;
		case offsetof(struct tcp_sock, snd_cwnd_stamp):
		end = offsetofend(struct tcp_sock, snd_cwnd_stamp);
		break;
		case offsetof(struct tcp_sock, snd_ssthresh):
		end = offsetofend(struct tcp_sock, snd_ssthresh);
		break;