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authorLawrence Brakmo <brakmo@fb.com>2017-06-30 20:02:44 -0700
committerDavid S. Miller <davem@davemloft.net>2017-07-01 16:15:13 -0700
commit13d3b1ebe28762c79e981931a41914fae5d04386 (patch)
tree2ba5e7acc2245ff6296bc8b51e10d49559cdb928 /include/net/tcp.h
parent61bc4d8daa7af018d7ea084ea38648828a5a90d5 (diff)
download96b-common-13d3b1ebe28762c79e981931a41914fae5d04386.tar.gz
bpf: Support for setting initial receive window
This patch adds suppport for setting the initial advertized window from within a BPF_SOCK_OPS program. This can be used to support larger initial cwnd values in environments where it is known to be safe. Signed-off-by: Lawrence Brakmo <brakmo@fb.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net/tcp.h')
-rw-r--r--include/net/tcp.h10
1 files changed, 10 insertions, 0 deletions
diff --git a/include/net/tcp.h b/include/net/tcp.h
index 564af2dee236..d6bb3948203d 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -2068,4 +2068,14 @@ static inline u32 tcp_timeout_init(struct sock *sk)
return timeout;
}
+static inline u32 tcp_rwnd_init_bpf(struct sock *sk)
+{
+ int rwnd;
+
+ rwnd = tcp_call_bpf(sk, BPF_SOCK_OPS_RWND_INIT);
+
+ if (rwnd < 0)
+ rwnd = 0;
+ return rwnd;
+}
#endif /* _TCP_H */