net: Pre-COW metrics for TCP.
TCP is going to record metrics for the connection,
so pre-COW the route metrics at route cache entry
creation time.
This avoids several atomic operations that have to
occur if we COW the metrics after the entry reaches
global visibility.
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/net/inet_sock.h b/include/net/inet_sock.h
index 8181498..6e6dfd7 100644
--- a/include/net/inet_sock.h
+++ b/include/net/inet_sock.h
@@ -219,7 +219,13 @@
static inline __u8 inet_sk_flowi_flags(const struct sock *sk)
{
- return inet_sk(sk)->transparent ? FLOWI_FLAG_ANYSRC : 0;
+ __u8 flags = 0;
+
+ if (inet_sk(sk)->transparent)
+ flags |= FLOWI_FLAG_ANYSRC;
+ if (sk->sk_protocol == IPPROTO_TCP)
+ flags |= FLOWI_FLAG_PRECOW_METRICS;
+ return flags;
}
#endif /* _INET_SOCK_H */