Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 13bf9641 authored by Lawrence Brakmo's avatar Lawrence Brakmo Committed by David S. Miller
Browse files

bpf: Adds support for setting sndcwnd clamp 



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: default avatarLawrence Brakmo <brakmo@fb.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 7bc62e28

include/uapi/linux/bpf.h

+1 −0
Original line number Diff line number Diff line
@@ -784,5 +784,6 @@ 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__ */

net/core/filter.c

+7 −0
Original line number Diff line number Diff line
@@ -2746,6 +2746,13 @@ BPF_CALL_5(bpf_setsockopt, struct bpf_sock_ops_kern *, bpf_sock, 
				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;

			}