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net: Check rps_flow_table when RPS map length is 1 

In get_rps_cpu, add check that the rps_flow_table for the device is
NULL when trying to take fast path when RPS map length is one.
Without this, RFS is effectively disabled if map length is one which
is not correct.

Signed-off-by: Tom Herbert <therbert@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tom Herbert 2011-01-31 16:23:42 -08:00 committed by David S. Miller
parent cc09b5f646
commit 8587523640
1 changed files with 2 additions and 1 deletions
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3
net/core/dev.c
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@ -2563,7 +2563,8 @@ static int get_rps_cpu(struct net_device *dev, struct sk_buff *skb,
map = rcu_dereference(rxqueue->rps_map);
if (map) {
if (map->len == 1) {
if (map->len == 1 &&
!rcu_dereference_raw(rxqueue->rps_flow_table)) {
tcpu = map->cpus[0];
if (cpu_online(tcpu))
cpu = tcpu;