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bpf: Support passing args to sock_ops bpf function

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Adds support for passing up to 4 arguments to sock_ops bpf functions. It
reusues the reply union, so the bpf_sock_ops structures are not
increased in size.

Signed-off-by: Lawrence Brakmo <brakmo@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Lawrence Brakmo
2018-01-25 16:14:09 -08:00
committed by Alexei Starovoitov
parent b73042b8a2
commit de525be2ca
6 changed files with 42 additions and 10 deletions
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2
net/ipv4/tcp_nv.c
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@@ -146,7 +146,7 @@ static void tcpnv_init(struct sock *sk)
* within a datacenter, where we have reasonable estimates of
* RTTs
*/
base_rtt = tcp_call_bpf(sk, BPF_SOCK_OPS_BASE_RTT);
base_rtt = tcp_call_bpf(sk, BPF_SOCK_OPS_BASE_RTT, 0, NULL);
if (base_rtt > 0) {
ca->nv_base_rtt = base_rtt;
ca->nv_lower_bound_rtt = (base_rtt * 205) >> 8; /* 80% */