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authorDaniel Borkmann <daniel@iogearbox.net>2015-05-09 22:51:31 +0200
committerDavid S. Miller <davem@davemloft.net>2015-05-11 11:10:34 -0400
commitc9e99fd078ef7fdcd9ee4f5a4cfdbece319587af (patch)
treeb9103eeb2aa3151ce6af1097938a6f42cc9b17f7
parent986ccfdbd90a292e8242c5d2647d8bb8565c38c3 (diff)
downloadop-kernel-dev-c9e99fd078ef7fdcd9ee4f5a4cfdbece319587af.zip
op-kernel-dev-c9e99fd078ef7fdcd9ee4f5a4cfdbece319587af.tar.gz
net: sched: consolidate handle_ing and ing_filter
Given quite some code has been removed from ing_filter(), we can just consolidate that function into handle_ing() and get rid of a few instructions at the same time. Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Alexei Starovoitov <ast@plumgrid.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--net/core/dev.c46
1 files changed, 16 insertions, 30 deletions
diff --git a/net/core/dev.c b/net/core/dev.c
index 862875e..8a75746 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -3521,37 +3521,19 @@ EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook);
#endif
#ifdef CONFIG_NET_CLS_ACT
-/* TODO: Maybe we should just force sch_ingress to be compiled in
- * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions
- * a compare and 2 stores extra right now if we dont have it on
- * but have CONFIG_NET_CLS_ACT
- * NOTE: This doesn't stop any functionality; if you dont have
- * the ingress scheduler, you just can't add policies on ingress.
- *
- */
-static int ing_filter(struct sk_buff *skb, struct netdev_queue *rxq)
-{
- int result = TC_ACT_OK;
- struct Qdisc *q;
-
- skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_INGRESS);
-
- q = rcu_dereference(rxq->qdisc);
- if (q != &noop_qdisc) {
- if (likely(!test_bit(__QDISC_STATE_DEACTIVATED, &q->state)))
- result = qdisc_enqueue_root(skb, q);
- }
-
- return result;
-}
-
static inline struct sk_buff *handle_ing(struct sk_buff *skb,
struct packet_type **pt_prev,
int *ret, struct net_device *orig_dev)
{
struct netdev_queue *rxq = rcu_dereference(skb->dev->ingress_queue);
+ struct Qdisc *q;
- if (!rxq || rcu_access_pointer(rxq->qdisc) == &noop_qdisc)
+ /* If there's at least one ingress present somewhere (so
+ * we get here via enabled static key), remaining devices
+ * that are not configured with an ingress qdisc will bail
+ * out w/o the rcu_dereference().
+ */
+ if (!rxq || (q = rcu_dereference(rxq->qdisc)) == &noop_qdisc)
return skb;
if (*pt_prev) {
@@ -3559,11 +3541,15 @@ static inline struct sk_buff *handle_ing(struct sk_buff *skb,
*pt_prev = NULL;
}
- switch (ing_filter(skb, rxq)) {
- case TC_ACT_SHOT:
- case TC_ACT_STOLEN:
- kfree_skb(skb);
- return NULL;
+ skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_INGRESS);
+
+ if (likely(!test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) {
+ switch (qdisc_enqueue_root(skb, q)) {
+ case TC_ACT_SHOT:
+ case TC_ACT_STOLEN:
+ kfree_skb(skb);
+ return NULL;
+ }
}
return skb;
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