From 60769a5dcd8755715c7143b4571d5c44f01796f1 Mon Sep 17 00:00:00 2001
From: Eric Dumazet <edumazet@google.com>
Date: Thu, 27 Sep 2012 02:48:50 +0000
Subject: ipv4: gre: add GRO capability

Add GRO capability to IPv4 GRE tunnels, using the gro_cells
infrastructure.

Tested using IPv4 and IPv6 TCP traffic inside this tunnel, and
checking GRO is building large packets.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
 net/ipv4/ip_gre.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

(limited to 'net/ipv4')

diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
index ef0b861ce044..b1871d993d22 100644
--- a/net/ipv4/ip_gre.c
+++ b/net/ipv4/ip_gre.c
@@ -740,8 +740,7 @@ static int ipgre_rcv(struct sk_buff *skb)
 		tstats->rx_bytes += skb->len;
 		u64_stats_update_end(&tstats->syncp);
 
-		netif_rx(skb);
-
+		gro_cells_receive(&tunnel->gro_cells, skb);
 		return 0;
 	}
 	icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0);
@@ -1319,6 +1318,9 @@ static const struct net_device_ops ipgre_netdev_ops = {
 
 static void ipgre_dev_free(struct net_device *dev)
 {
+	struct ip_tunnel *tunnel = netdev_priv(dev);
+
+	gro_cells_destroy(&tunnel->gro_cells);
 	free_percpu(dev->tstats);
 	free_netdev(dev);
 }
@@ -1350,6 +1352,7 @@ static int ipgre_tunnel_init(struct net_device *dev)
 {
 	struct ip_tunnel *tunnel;
 	struct iphdr *iph;
+	int err;
 
 	tunnel = netdev_priv(dev);
 	iph = &tunnel->parms.iph;
@@ -1376,6 +1379,12 @@ static int ipgre_tunnel_init(struct net_device *dev)
 	if (!dev->tstats)
 		return -ENOMEM;
 
+	err = gro_cells_init(&tunnel->gro_cells, dev);
+	if (err) {
+		free_percpu(dev->tstats);
+		return err;
+	}
+
 	return 0;
 }
 
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