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Commit fc747810 authored by Lawrence Brakmo's avatar Lawrence Brakmo Committed by David S. Miller
Browse files

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: default avatarLawrence Brakmo <brakmo@fb.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent bb56d444

include/uapi/linux/bpf.h

+2 −0
Original line number Diff line number Diff line
@@ -783,4 +783,6 @@ enum { 
					 */

};



#define TCP_BPF_IW		1001	/* Set TCP initial congestion window */



#endif /* _UAPI__LINUX_BPF_H__ */

net/core/filter.c

+17 −1
Original line number Diff line number Diff line
@@ -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 {

			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;