ipv4: Call fib_select_default() only when actually necessary.

fib_select_default() is a complete NOP, and completely pointless
to invoke, when we have no more than 1 default route installed.

And this is far and away the common case.

So remember how many prefixlen==0 routes we have in the routing
table, and elide the call when we have no more than one of those.

This cuts output route creation time by 157 cycles on Niagara2+.

In order to add the new int to fib_table, we have to correct the type
of ->tb_data[] to unsigned long, otherwise the private area will be
unaligned on 64-bit systems.

Signed-off-by: David S. Miller <davem@davemloft.net>
Reviewed-by: Eric Dumazet <eric.dumazet@gmail.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/include/net/ip_fib.h b/include/net/ip_fib.h
index 514627f56339..10422ef14e28 100644
--- a/include/net/ip_fib.h
+++ b/include/net/ip_fib.h
@@ -160,7 +160,8 @@ struct fib_table {
         struct hlist_node tb_hlist;
         u32             tb_id;
         int             tb_default;
-        unsigned char   tb_data[0];
+        int             tb_num_default;
+        unsigned long   tb_data[0];
 };
 
 extern int fib_table_lookup(struct fib_table *tb, const struct flowi4 *flp,