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: [RFC PATCH net-next v2 14/15] bpf: Adds support for setting sndcwnd clamp
Date: Thu, 15 Jun 2017 13:08:43 -0700 [thread overview]
Message-ID: <20170615200844.2752485-15-brakmo@fb.com> (raw)
In-Reply-To: <20170615200844.2752485-1-brakmo@fb.com>
Adds a new bpf_setsockopt for TCP sockets, TCP_BPF_SNDCWND_CLAMP, which
sets the initial congestion window. It is useful to limit the sndcwnd
when the host are close to each other (small RTT).
Signed-off-by: Lawrence Brakmo <brakmo@fb•com>
---
include/uapi/linux/bpf.h | 1 +
net/core/filter.c | 7 +++++++
2 files changed, 8 insertions(+)
diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
index ecb28e2..4d033eb 100644
--- a/include/uapi/linux/bpf.h
+++ b/include/uapi/linux/bpf.h
@@ -782,5 +782,6 @@ enum {
};
#define TCP_BPF_IW 1001 /* Set TCP initial congestion window */
+#define TCP_BPF_SNDCWND_CLAMP 1002 /* Set sndcwnd_clamp */
#endif /* _UAPI__LINUX_BPF_H__ */
diff --git a/net/core/filter.c b/net/core/filter.c
index a1d9214..f484fef 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -2733,6 +2733,13 @@ BPF_CALL_5(bpf_setsockopt, struct bpf_socket_ops_kern *, bpf_socket,
else
tp->snd_cwnd = val;
break;
+ case TCP_BPF_SNDCWND_CLAMP:
+ if (val <= 0) {
+ ret = -EINVAL;
+ } else {
+ tp->snd_cwnd_clamp = val;
+ tp->snd_ssthresh = val;
+ }
default:
ret = -EINVAL;
}
--
2.9.3
next prev parent reply other threads:[~2017-06-15 20:08 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-06-15 20:08 [RFC PATCH net-next v2 00/15] bpf: BPF support for socket ops Lawrence Brakmo
2017-06-15 20:08 ` [RFC PATCH net-next v2 01/15] " Lawrence Brakmo
2017-06-16 12:07 ` Daniel Borkmann
2017-06-16 23:41 ` Lawrence Brakmo
2017-06-19 18:44 ` Daniel Borkmann
2017-06-19 20:49 ` Lawrence Brakmo
2017-06-17 21:48 ` Lawrence Brakmo
2017-06-19 18:52 ` Daniel Borkmann
2017-06-19 20:49 ` Lawrence Brakmo
2017-06-15 20:08 ` [RFC PATCH net-next v2 02/15] bpf: program to load socketops BPF programs Lawrence Brakmo
2017-06-15 20:08 ` [RFC PATCH net-next v2 03/15] bpf: Support for per connection SYN/SYN-ACK RTOs Lawrence Brakmo
2017-06-15 20:08 ` [RFC PATCH net-next v2 04/15] bpf: Sample bpf program to set " Lawrence Brakmo
2017-06-15 20:08 ` [RFC PATCH net-next v2 05/15] bpf: Support for setting initial receive window Lawrence Brakmo
2017-06-15 20:08 ` [RFC PATCH net-next v2 06/15] bpf: Sample bpf program to set initial window Lawrence Brakmo
2017-06-15 20:08 ` [RFC PATCH net-next v2 07/15] bpf: Add setsockopt helper function to bpf Lawrence Brakmo
2017-06-16 13:27 ` Daniel Borkmann
2017-06-17 23:17 ` Lawrence Brakmo
2017-06-15 20:08 ` [RFC PATCH net-next v2 08/15] bpf: Add TCP connection BPF callbacks Lawrence Brakmo
2017-06-15 20:08 ` [RFC PATCH net-next v2 09/15] bpf: Sample BPF program to set buffer sizes Lawrence Brakmo
2017-06-15 20:08 ` [RFC PATCH net-next v2 10/15] bpf: Add support for changing congestion control Lawrence Brakmo
2017-06-16 13:58 ` Daniel Borkmann
2017-06-18 2:39 ` Lawrence Brakmo
2017-06-19 22:34 ` Daniel Borkmann
2017-06-20 0:35 ` Lawrence Brakmo
2017-06-15 20:08 ` [RFC PATCH net-next v2 11/15] bpf: Sample BPF program to set " Lawrence Brakmo
2017-06-15 20:08 ` [RFC PATCH net-next v2 12/15] bpf: Adds support for setting initial cwnd Lawrence Brakmo
2017-06-15 20:08 ` [RFC PATCH net-next v2 13/15] bpf: Sample BPF program to set " Lawrence Brakmo
2017-06-15 20:08 ` Lawrence Brakmo [this message]
2017-06-15 20:08 ` [RFC PATCH net-next v2 15/15] bpf: Sample bpf program to set sndcwnd clamp Lawrence Brakmo
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