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net: use indirect calls helpers for L3 handler hooks

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So that we avoid another indirect call per RX packet in the common
case.

Signed-off-by: Paolo Abeni <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Paolo Abeni 2019-05-03 17:01:37 +02:00 • committed by David S. Miller
commit 0e219ae48c
4 changed files with 15 additions and 4 deletions
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6
net/ipv4/ip_input.c
View file

@ -130,6 +130,7 @@
#include <linux/inetdevice.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/indirect_call_wrapper.h>
#include <net/snmp.h>
#include <net/ip.h>
@ -188,6 +189,8 @@ bool ip_call_ra_chain(struct sk_buff *skb)
return false;
}
INDIRECT_CALLABLE_DECLARE(int udp_rcv(struct sk_buff *));
INDIRECT_CALLABLE_DECLARE(int tcp_v4_rcv(struct sk_buff *));
void ip_protocol_deliver_rcu(struct net *net, struct sk_buff *skb, int protocol)
{
const struct net_protocol *ipprot;
@ -205,7 +208,8 @@ resubmit:
}
nf_reset(skb);
}
ret = ipprot->handler(skb);
ret = INDIRECT_CALL_2(ipprot->handler, tcp_v4_rcv, udp_rcv,
skb);
if (ret < 0) {
protocol = -ret;
goto resubmit;