udp: introduce a udp_hashfn function
Currently the chain to store a UDP socket is calculated with
simple (x & (UDP_HTABLE_SIZE - 1)). But taking net into account
would make this calculation a bit more complex, so moving it into
a function would help.
Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/udp.h b/include/linux/udp.h
index 581ca2c..9c94312 100644
--- a/include/linux/udp.h
+++ b/include/linux/udp.h
@@ -46,6 +46,11 @@
#define UDP_HTABLE_SIZE 128
+static inline int udp_hashfn(const unsigned num)
+{
+ return num & (UDP_HTABLE_SIZE - 1);
+}
+
struct udp_sock {
/* inet_sock has to be the first member */
struct inet_sock inet;