From 0e219ae48c3bbf382ef96adf3825457315728c03 Mon Sep 17 00:00:00 2001
From: Paolo Abeni <pabeni@redhat.com>
Date: Fri, 3 May 2019 17:01:37 +0200
Subject: net: use indirect calls helpers for L3 handler hooks

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

Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
 net/ipv4/ip_input.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

(limited to 'net/ipv4/ip_input.c')

diff --git a/net/ipv4/ip_input.c b/net/ipv4/ip_input.c
index 1132d6d1796a..8d78de4b0304 100644
--- a/net/ipv4/ip_input.c
+++ b/net/ipv4/ip_input.c
@@ -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;
-- 
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