diff mbox series

[net-next,v3,2/3] bpf: tcp: Allow to write tp->snd_cwnd_stamp in bpf_tcp_ca

Message ID 20240502042318.801932-3-miaxu@meta.com (mailing list archive)
State Accepted
Commit 0325cbd21e3c26eff88bc7da303ffb46b4f5d294
Delegated to: BPF
Headers show
Series Add new args into tcp_congestion_ops' cong_control | expand

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netdev/contest success net-next-2024-05-02--06-00 (tests: 996)
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Commit Message

Miao Xu May 2, 2024, 4:23 a.m. UTC 
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>
---
Changes in v3:
* Updated the title.

Changes in v2:
* None. It is a spinout from the original 1st patch.

Signed-off-by: Miao Xu <miaxu@meta.com>
---
 net/ipv4/bpf_tcp_ca.c | 3 +++
 1 file changed, 3 insertions(+)
diff mbox series

Patch

diff --git a/net/ipv4/bpf_tcp_ca.c b/net/ipv4/bpf_tcp_ca.c
index 6bd7f8db189a..18227757ec0c 100644
--- a/net/ipv4/bpf_tcp_ca.c
+++ b/net/ipv4/bpf_tcp_ca.c
@@ -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;