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net: use jump label patching for ingress qdisc in __netif_receive_skb_core

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Even if we make use of classifier and actions from the egress
path, we're going into handle_ing() executing additional code
on a per-packet cost for ingress qdisc, just to realize that
nothing is attached on ingress.

Instead, this can just be blinded out as a no-op entirely with
the use of a static key. On input fast-path, we already make
use of static keys in various places, e.g. skb time stamping,
in RPS, etc. It makes sense to not waste time when we're assured
that no ingress qdisc is attached anywhere.

Enabling/disabling of that code path is being done via two
helpers, namely net_{inc,dec}_ingress_queue(), that are being
invoked under RTNL mutex when a ingress qdisc is being either
initialized or destructed.

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
2015-04-10 23:07:54 +02:00
committed by David S. Miller
parent dfc96c192a
commit 4577139b2d
3 changed files with 47 additions and 8 deletions
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include/linux/rtnetlink.h
+14 -1
View File
@@ -77,7 +77,20 @@ static inline struct netdev_queue *dev_ingress_queue(struct net_device *dev)
return rtnl_dereference(dev->ingress_queue);
}
extern struct netdev_queue *dev_ingress_queue_create(struct net_device *dev);
struct netdev_queue *dev_ingress_queue_create(struct net_device *dev);
#ifdef CONFIG_NET_CLS_ACT
void net_inc_ingress_queue(void);
void net_dec_ingress_queue(void);
#else
static inline void net_inc_ingress_queue(void)
{
}
static inline void net_dec_ingress_queue(void)
{
}
#endif
extern void rtnetlink_init(void);
extern void __rtnl_unlock(void);