linux-kernel - [PATCH net-next 1/4] net: use indirect call helpers for dst

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Message-Id: <20201211015823.1079574-2-brianvv@google.com>
Date:   Fri, 11 Dec 2020 01:58:20 +0000
From:   Brian Vazquez <brianvv@...gle.com>
To:     Brian Vazquez <brianvv.kernel@...il.com>,
        Brian Vazquez <brianvv@...gle.com>,
        Eric Dumazet <edumazet@...gle.com>,
        "David S . Miller" <davem@...emloft.net>
Cc:     linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: [PATCH net-next 1/4] net: use indirect call helpers for dst_input

From: brianvv <brianvv@...gle.com>

This patch avoids the indirect call for the common case:
ip_local_deliver and ip6_input

Signed-off-by: brianvv <brianvv@...gle.com>
---
 include/net/dst.h | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/include/net/dst.h b/include/net/dst.h
index 10f0a8399867..98cf6e8c06c4 100644
--- a/include/net/dst.h
+++ b/include/net/dst.h
@@ -18,6 +18,7 @@
 #include <linux/refcount.h>
 #include <net/neighbour.h>
 #include <asm/processor.h>
+#include <linux/indirect_call_wrapper.h>
 
 struct sk_buff;
 
@@ -441,10 +442,13 @@ static inline int dst_output(struct net *net, struct sock *sk, struct sk_buff *s
 	return skb_dst(skb)->output(net, sk, skb);
 }
 
+INDIRECT_CALLABLE_DECLARE(int ip6_input(struct sk_buff *));
+INDIRECT_CALLABLE_DECLARE(int ip_local_deliver(struct sk_buff *));
 /* Input packet from network to transport.  */
 static inline int dst_input(struct sk_buff *skb)
 {
-	return skb_dst(skb)->input(skb);
+	return INDIRECT_CALL_INET(skb_dst(skb)->input,
+				  ip6_input, ip_local_deliver, skb);
 }
 
 static inline struct dst_entry *dst_check(struct dst_entry *dst, u32 cookie)
-- 
2.29.2.576.ga3fc446d84-goog