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: NLawrence Brakmo <brakmo@fb.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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