netdev - [PATCH net-next] udp: gro behind static key

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Message-Id: <20181005153140.205743-1-willemdebruijn.kernel@gmail.com>
Date:   Fri,  5 Oct 2018 11:31:40 -0400
From:   Willem de Bruijn <willemdebruijn.kernel@...il.com>
To:     netdev@...r.kernel.org
Cc:     pabeni@...hat.com, tom@...bertland.com, davem@...emloft.net,
        steffen.klassert@...unet.com, Willem de Bruijn <willemb@...gle.com>
Subject: [PATCH net-next] udp: gro behind static key

From: Willem de Bruijn <willemb@...gle.com>

Avoid the socket lookup cost in udp_gro_receive if no socket has a
udp tunnel callback configured.

udp_sk(sk)->gro_receive requires a registration with
setup_udp_tunnel_sock, which enables the static key.

Signed-off-by: Willem de Bruijn <willemb@...gle.com>
---
 include/net/udp.h      | 2 ++
 net/ipv4/udp.c         | 2 +-
 net/ipv4/udp_offload.c | 2 +-
 net/ipv6/udp.c         | 2 +-
 net/ipv6/udp_offload.c | 2 +-
 5 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/include/net/udp.h b/include/net/udp.h
index 8482a990b0bb..9e82cb391dea 100644
--- a/include/net/udp.h
+++ b/include/net/udp.h
@@ -443,8 +443,10 @@ int udpv4_offload_init(void);
 
 void udp_init(void);
 
+DECLARE_STATIC_KEY_FALSE(udp_encap_needed_key);
 void udp_encap_enable(void);
 #if IS_ENABLED(CONFIG_IPV6)
+DECLARE_STATIC_KEY_FALSE(udpv6_encap_needed_key);
 void udpv6_encap_enable(void);
 #endif
 
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index 5fc4beb1c336..1bec2203d558 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -1889,7 +1889,7 @@ static int __udp_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
 	return 0;
 }
 
-static DEFINE_STATIC_KEY_FALSE(udp_encap_needed_key);
+DEFINE_STATIC_KEY_FALSE(udp_encap_needed_key);
 void udp_encap_enable(void)
 {
 	static_branch_enable(&udp_encap_needed_key);
diff --git a/net/ipv4/udp_offload.c b/net/ipv4/udp_offload.c
index 0c0522b79b43..802f2bc00d69 100644
--- a/net/ipv4/udp_offload.c
+++ b/net/ipv4/udp_offload.c
@@ -405,7 +405,7 @@ static struct sk_buff *udp4_gro_receive(struct list_head *head,
 {
 	struct udphdr *uh = udp_gro_udphdr(skb);
 
-	if (unlikely(!uh))
+	if (unlikely(!uh) || !static_branch_unlikely(&udp_encap_needed_key))
 		goto flush;
 
 	/* Don't bother verifying checksum if we're going to flush anyway. */
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index 28c4aa5078fc..374e7d302f26 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -548,7 +548,7 @@ static __inline__ void udpv6_err(struct sk_buff *skb,
 	__udp6_lib_err(skb, opt, type, code, offset, info, &udp_table);
 }
 
-static DEFINE_STATIC_KEY_FALSE(udpv6_encap_needed_key);
+DEFINE_STATIC_KEY_FALSE(udpv6_encap_needed_key);
 void udpv6_encap_enable(void)
 {
 	static_branch_enable(&udpv6_encap_needed_key);
diff --git a/net/ipv6/udp_offload.c b/net/ipv6/udp_offload.c
index 95dee9ca8d22..1b8e161ac527 100644
--- a/net/ipv6/udp_offload.c
+++ b/net/ipv6/udp_offload.c
@@ -119,7 +119,7 @@ static struct sk_buff *udp6_gro_receive(struct list_head *head,
 {
 	struct udphdr *uh = udp_gro_udphdr(skb);
 
-	if (unlikely(!uh))
+	if (unlikely(!uh) || !static_branch_unlikely(&udpv6_encap_needed_key))
 		goto flush;
 
 	/* Don't bother verifying checksum if we're going to flush anyway. */
-- 
2.19.0.605.g01d371f741-goog