[PATCH net-next v2 2/4] net: use indirect call helpers for dst_output

[Brian Vazquez]

From: brianvv <bria...@google.com>

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

Signed-off-by: brianvv <bria...@google.com>
---
 include/net/dst.h     | 8 +++++++-
 net/ipv4/ip_output.c  | 1 +
 net/ipv6/ip6_output.c | 1 +
 3 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/include/net/dst.h b/include/net/dst.h
index 98cf6e8c06c4..3932e9931f08 100644
--- a/include/net/dst.h
+++ b/include/net/dst.h
@@ -436,10 +436,16 @@ 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 879b76ae4435..356c89575b08 100644
--- a/net/ipv4/ip_output.c
+++ b/net/ipv4/ip_output.c
@@ -434,6 +434,7 @@ 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 749ad72386b2..1260c0cac592 100644
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -178,6 +178,7 @@ 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)
 {
-- 
2.29.2.576.ga3fc446d84-goog