net: rps: add the shortcut for one rps_cpus
When there is only one rps_cpus, skb_get_rxhash() can be eliminated.
Signed-off-by: Changli Gao <xiaosuo@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/core/dev.c b/net/core/dev.c
index efd318d..cdbbea3 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2343,7 +2343,7 @@
struct rps_dev_flow **rflowp)
{
struct netdev_rx_queue *rxqueue;
- struct rps_map *map;
+ struct rps_map *map = NULL;
struct rps_dev_flow_table *flow_table;
struct rps_sock_flow_table *sock_flow_table;
int cpu = -1;
@@ -2361,8 +2361,17 @@
} else
rxqueue = dev->_rx;
- if (!rxqueue->rps_map && !rxqueue->rps_flow_table)
+ if (rxqueue->rps_map) {
+ map = rcu_dereference(rxqueue->rps_map);
+ if (map && map->len == 1) {
+ tcpu = map->cpus[0];
+ if (cpu_online(tcpu))
+ cpu = tcpu;
+ goto done;
+ }
+ } else if (!rxqueue->rps_flow_table) {
goto done;
+ }
skb_reset_network_header(skb);
if (!skb_get_rxhash(skb))
@@ -2407,7 +2416,6 @@
}
}
- map = rcu_dereference(rxqueue->rps_map);
if (map) {
tcpu = map->cpus[((u64) skb->rxhash * map->len) >> 32];