[PATCH net-next 3/4] net: use indirect calls helpers at early demux stage

[Paolo Abeni]

So that we avoid another indirect call per RX packet, if
early demux is enabled.

Signed-off-by: Paolo Abeni <pab...@redhat.com>
---
 net/ipv4/ip_input.c  | 5 ++++-
 net/ipv6/ip6_input.c | 5 ++++-
 net/ipv6/tcp_ipv6.c  | 2 +-
 net/ipv6/udp.c       | 2 +-
 4 files changed, 10 insertions(+), 4 deletions(-)

diff --git a/net/ipv4/ip_input.c b/net/ipv4/ip_input.c
index 8d78de4b0304..ed97724c5e33 100644
--- a/net/ipv4/ip_input.c
+++ b/net/ipv4/ip_input.c
@@ -309,6 +309,8 @@ static inline bool ip_rcv_options(struct sk_buff *skb, 
struct net_device *dev)
        return true;
 }
 
+INDIRECT_CALLABLE_DECLARE(int udp_v4_early_demux(struct sk_buff *));
+INDIRECT_CALLABLE_DECLARE(int tcp_v4_early_demux(struct sk_buff *));
 static int ip_rcv_finish_core(struct net *net, struct sock *sk,
                              struct sk_buff *skb, struct net_device *dev)
 {
@@ -326,7 +328,8 @@ static int ip_rcv_finish_core(struct net *net, struct sock 
*sk,
 
                ipprot = rcu_dereference(inet_protos[protocol]);
                if (ipprot && (edemux = READ_ONCE(ipprot->early_demux))) {
-                       err = edemux(skb);
+                       err = INDIRECT_CALL_2(edemux, tcp_v4_early_demux,
+                                             udp_v4_early_demux, skb);
                        if (unlikely(err))
                                goto drop_error;
                        /* must reload iph, skb->head might have changed */
diff --git a/net/ipv6/ip6_input.c b/net/ipv6/ip6_input.c
index adf06159837f..b50b1af1f530 100644
--- a/net/ipv6/ip6_input.c
+++ b/net/ipv6/ip6_input.c
@@ -48,6 +48,8 @@
 #include <net/inet_ecn.h>
 #include <net/dst_metadata.h>
 
+INDIRECT_CALLABLE_DECLARE(void udp_v6_early_demux(struct sk_buff *));
+INDIRECT_CALLABLE_DECLARE(void tcp_v6_early_demux(struct sk_buff *));
 static void ip6_rcv_finish_core(struct net *net, struct sock *sk,
                                struct sk_buff *skb)
 {
@@ -58,7 +60,8 @@ static void ip6_rcv_finish_core(struct net *net, struct sock 
*sk,
 
                ipprot = rcu_dereference(inet6_protos[ipv6_hdr(skb)->nexthdr]);
                if (ipprot && (edemux = READ_ONCE(ipprot->early_demux)))
-                       edemux(skb);
+                       INDIRECT_CALL_2(edemux, tcp_v6_early_demux,
+                                       udp_v6_early_demux, skb);
        }
        if (!skb_valid_dst(skb))
                ip6_route_input(skb);
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index d58bf84e0f9a..beaf28456301 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -1655,7 +1655,7 @@ INDIRECT_CALLABLE_SCOPE int tcp_v6_rcv(struct sk_buff 
*skb)
        goto discard_it;
 }
 
-static void tcp_v6_early_demux(struct sk_buff *skb)
+INDIRECT_CALLABLE_SCOPE void tcp_v6_early_demux(struct sk_buff *skb)
 {
        const struct ipv6hdr *hdr;
        const struct tcphdr *th;
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index b3fcafaf5576..07fa579dfb96 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -981,7 +981,7 @@ static struct sock *__udp6_lib_demux_lookup(struct net *net,
        return NULL;
 }
 
-static void udp_v6_early_demux(struct sk_buff *skb)
+INDIRECT_CALLABLE_SCOPE void udp_v6_early_demux(struct sk_buff *skb)
 {
        struct net *net = dev_net(skb->dev);
        const struct udphdr *uh;
-- 
2.20.1