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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>
This commit is contained in:
Daniel Borkmann 2015-05-09 22:51:31 +02:00 committed by David S. Miller
parent 986ccfdbd9
commit c9e99fd078
1 changed files with 16 additions and 30 deletions
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46
net/core/dev.c
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@ -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;