diff options
| author | Lawrence Brakmo <brakmo@fb.com> | 2017-06-30 20:02:51 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-07-01 16:15:14 -0700 |
| commit | fc7478103c84af437ca3bfae71a82631f770bf7e (patch) | |
| tree | 1206a0518c692212f01c133a8aac0c9385946fc6 | |
| parent | bb56d4449d8b8de1f22a07f007bb91cb30fcc7cc (diff) | |
| download | linux-fc7478103c84af437ca3bfae71a82631f770bf7e.tar.bz2 | |
bpf: Adds support for setting initial cwnd
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>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | include/uapi/linux/bpf.h | 2 | ||||
| -rw-r--r-- | net/core/filter.c | 18 |
2 files changed, 19 insertions, 1 deletions
diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h index cc4725982bd8..32755b538652 100644 --- a/include/uapi/linux/bpf.h +++ b/include/uapi/linux/bpf.h @@ -783,4 +783,6 @@ 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 12df52711fe8..794be0a454f5 100644 --- a/net/core/filter.c +++ b/net/core/filter.c @@ -2732,7 +2732,23 @@ 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); + + if (optlen != sizeof(int)) + return -EINVAL; + + val = *((int *)optval); + /* Only some options are supported */ + 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; |