From: Brian Vazquez <brianvv@google.com>
Date: Mon, 1 Feb 2021 17:41:30 +0000 (+0000)
Subject: net: use indirect call helpers for dst_output
X-Git-Tag: v5.10.235~99
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=8dd2086cc35b8ebcf3793ad4dd0ee89dfb1cdc18;p=thirdparty%2Fkernel%2Fstable.git

net: use indirect call helpers for dst_output

[ Upstream commit 6585d7dc491d9d5e323ed52ee32ad071e04c9dfa ]

This patch avoids the indirect call for the common case:
ip6_output and ip_output

Signed-off-by: Brian Vazquez <brianvv@google.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Stable-dep-of: 13e55fbaec17 ("net: ipv6: fix dst ref loop on input in rpl lwt")
Signed-off-by: Sasha Levin <sashal@kernel.org>
---

diff --git a/include/net/dst.h b/include/net/dst.h
index 907b4b5893a67..af57a6284444c 100644
--- a/include/net/dst.h
+++ b/include/net/dst.h
@@ -431,10 +431,16 @@ static inline void dst_set_expires(struct dst_entry *dst, int timeout)
 		dst->expires = expires;
 }
 
+INDIRECT_CALLABLE_DECLARE(int ip6_output(struct net *, struct sock *,
+					 struct sk_buff *));
+INDIRECT_CALLABLE_DECLARE(int ip_output(struct net *, struct sock *,
+					 struct sk_buff *));
 /* Output packet to network from transport.  */
 static inline int dst_output(struct net *net, struct sock *sk, struct sk_buff *skb)
 {
-	return skb_dst(skb)->output(net, sk, skb);
+	return INDIRECT_CALL_INET(skb_dst(skb)->output,
+				  ip6_output, ip_output,
+				  net, sk, skb);
 }
 
 INDIRECT_CALLABLE_DECLARE(int ip6_input(struct sk_buff *));
diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c
index 12ee857d6cfe4..1e430e135aa60 100644
--- a/net/ipv4/ip_output.c
+++ b/net/ipv4/ip_output.c
@@ -441,6 +441,7 @@ int ip_output(struct net *net, struct sock *sk, struct sk_buff *skb)
 			    ip_finish_output,
 			    !(IPCB(skb)->flags & IPSKB_REROUTED));
 }
+EXPORT_SYMBOL(ip_output);
 
 /*
  * copy saddr and daddr, possibly using 64bit load/stores
diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
index 4da3238836b73..5003c5a23fa70 100644
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -236,6 +236,7 @@ int ip6_output(struct net *net, struct sock *sk, struct sk_buff *skb)
 			    ip6_finish_output,
 			    !(IP6CB(skb)->flags & IP6SKB_REROUTED));
 }
+EXPORT_SYMBOL(ip6_output);
 
 bool ip6_autoflowlabel(struct net *net, const struct ipv6_pinfo *np)
 {