From: Lawrence Brakmo <brakmo@fb.com>
To: netdev <netdev@vger.kernel.org>
Cc: Kernel Team <kernel-team@fb.com>, Blake Matheny <bmatheny@fb.com>,
Alexei Starovoitov <ast@fb.com>,
Daniel Borkmann <daniel@iogearbox.net>,
David Ahern <dsa@cumulusnetworks.com>
Subject: [PATCH net-next v3 12/15] bpf: Adds support for setting initial cwnd
Date: Mon, 19 Jun 2017 20:00:45 -0700 [thread overview]
Message-ID: <20170620030048.3275347-13-brakmo@fb.com> (raw)
In-Reply-To: <20170620030048.3275347-1-brakmo@fb.com>
Adds a new bpf_setsockopt for TCP sockets, TCP_BPF_IW, which sets the
initial congestion window. This can be used when the hosts are far
apart (large RTTs) and it is safe to start with a large inital cwnd.
Signed-off-by: Lawrence Brakmo <brakmo@fb.com>
---
include/uapi/linux/bpf.h | 2 ++
net/core/filter.c | 14 +++++++++++++-
2 files changed, 15 insertions(+), 1 deletion(-)
diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
index c222059..a07acc6 100644
--- a/include/uapi/linux/bpf.h
+++ b/include/uapi/linux/bpf.h
@@ -781,4 +781,6 @@ enum {
*/
};
+#define TCP_BPF_IW 1001 /* Set TCP initial congestion window */
+
#endif /* _UAPI__LINUX_BPF_H__ */
diff --git a/net/core/filter.c b/net/core/filter.c
index bbf8f78..db6d30c0 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -2723,7 +2723,19 @@ BPF_CALL_5(bpf_setsockopt, struct bpf_sock_ops_kern *, bpf_sock,
tcp_reinit_congestion_control(sk,
inet_csk(sk)->icsk_ca_ops);
} else {
- ret = -EINVAL;
+ struct tcp_sock *tp = tcp_sk(sk);
+
+ val = *((int *)optval);
+ switch (optname) {
+ case TCP_BPF_IW:
+ if (val <= 0 || tp->data_segs_out > 0)
+ ret = -EINVAL;
+ else
+ tp->snd_cwnd = val;
+ break;
+ default:
+ ret = -EINVAL;
+ }
}
} else {
ret = -EINVAL;
--
2.9.3
next prev parent reply other threads:[~2017-06-20 3:00 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-06-20 3:00 PATCH net-next v3 00/15 Lawrence Brakmo
2017-06-20 3:00 ` [PATCH net-next v3 01/15] bpf: BPF support for sock_ops Lawrence Brakmo
2017-06-22 22:41 ` Daniel Borkmann
2017-06-22 22:58 ` Lawrence Brakmo
2017-06-22 23:19 ` Daniel Borkmann
2017-06-22 23:57 ` Lawrence Brakmo
2017-06-23 21:15 ` Daniel Borkmann
2017-06-28 17:45 ` Lawrence Brakmo
2017-06-29 9:47 ` Daniel Borkmann
2017-06-20 3:00 ` [PATCH net-next v3 02/15] bpf: program to load sock_ops BPF programs Lawrence Brakmo
2017-06-20 3:00 ` [PATCH net-next v3 03/15] bpf: Support for per connection SYN/SYN-ACK RTOs Lawrence Brakmo
2017-06-20 3:00 ` [PATCH net-next v3 04/15] bpf: Sample bpf program to set " Lawrence Brakmo
2017-06-20 3:00 ` [PATCH net-next v3 05/15] bpf: Support for setting initial receive window Lawrence Brakmo
2017-06-20 3:00 ` [PATCH net-next v3 06/15] bpf: Sample bpf program to set initial window Lawrence Brakmo
2017-06-20 3:00 ` [PATCH net-next v3 07/15] bpf: Add setsockopt helper function to bpf Lawrence Brakmo
2017-06-20 21:25 ` Craig Gallek
2017-06-21 16:51 ` Lawrence Brakmo
2017-06-21 17:13 ` Craig Gallek
2017-06-21 23:55 ` Lawrence Brakmo
2017-06-20 3:00 ` [PATCH net-next v3 08/15] bpf: Add TCP connection BPF callbacks Lawrence Brakmo
2017-06-20 3:00 ` [PATCH net-next v3 09/15] bpf: Sample BPF program to set buffer sizes Lawrence Brakmo
2017-06-20 3:00 ` [PATCH net-next v3 10/15] bpf: Add support for changing congestion control Lawrence Brakmo
2017-06-20 8:40 ` kbuild test robot
2017-06-20 3:00 ` [PATCH net-next v3 11/15] bpf: Sample BPF program to set " Lawrence Brakmo
2017-06-20 3:00 ` Lawrence Brakmo [this message]
2017-06-20 3:00 ` [PATCH net-next v3 13/15] bpf: Sample BPF program to set initial cwnd Lawrence Brakmo
2017-06-20 3:00 ` [PATCH net-next v3 14/15] bpf: Adds support for setting sndcwnd clamp Lawrence Brakmo
2017-06-20 3:00 ` [PATCH net-next v3 15/15] bpf: Sample bpf program to set " Lawrence Brakmo
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