netdev - [PATCH net-next] inet: restore gso for vxlan

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Date:	Sun, 27 Oct 2013 18:18:16 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Alexei Starovoitov <ast@...mgrid.com>
Cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org
Subject: [PATCH net-next] inet: restore gso for vxlan

From: Eric Dumazet <edumazet@...gle.com>

Alexei reported a performance regression on vxlan, caused
by commit 3347c9602955 "ipv4: gso: make inet_gso_segment() stackable"

GSO vxlan packets were not properly segmented, adding IP fragments
while they were not expected.

Rename 'bool tunnel' to 'bool encap', and add a new boolean
to express the fact that UDP should be fragmented.
This fragmentation is triggered by skb->encapsulation being set.

Remove a "skb->encapsulation = 1" added in above commit,
as its not needed, as frags inherit skb->frag from original
GSO skb.
 
Reported-by: Alexei Starovoitov <ast@...mgrid.com>
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Tested-by: Alexei Starovoitov <ast@...mgrid.com>
---
 net/ipv4/af_inet.c |   15 +++++++--------
 1 file changed, 7 insertions(+), 8 deletions(-)

diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c
index f4a159e705c0..09d78d4a3cff 100644
--- a/net/ipv4/af_inet.c
+++ b/net/ipv4/af_inet.c
@@ -1251,8 +1251,8 @@ static struct sk_buff *inet_gso_segment(struct sk_buff *skb,
 	struct sk_buff *segs = ERR_PTR(-EINVAL);
 	const struct net_offload *ops;
 	unsigned int offset = 0;
+	bool udpfrag, encap;
 	struct iphdr *iph;
-	bool tunnel;
 	int proto;
 	int nhoff;
 	int ihl;
@@ -1290,8 +1290,8 @@ static struct sk_buff *inet_gso_segment(struct sk_buff *skb,
 		goto out;
 	__skb_pull(skb, ihl);
 
-	tunnel = SKB_GSO_CB(skb)->encap_level > 0;
-	if (tunnel)
+	encap = SKB_GSO_CB(skb)->encap_level > 0;
+	if (encap)
 		features = skb->dev->hw_enc_features & netif_skb_features(skb);
 	SKB_GSO_CB(skb)->encap_level += ihl;
 
@@ -1306,24 +1306,23 @@ static struct sk_buff *inet_gso_segment(struct sk_buff *skb,
 	if (IS_ERR_OR_NULL(segs))
 		goto out;
 
+	udpfrag = !!skb->encapsulation && proto == IPPROTO_UDP;
 	skb = segs;
 	do {
 		iph = (struct iphdr *)(skb_mac_header(skb) + nhoff);
-		if (!tunnel && proto == IPPROTO_UDP) {
+		if (udpfrag) {
 			iph->id = htons(id);
 			iph->frag_off = htons(offset >> 3);
 			if (skb->next != NULL)
 				iph->frag_off |= htons(IP_MF);
 			offset += skb->len - nhoff - ihl;
-		} else  {
+		} else {
 			iph->id = htons(id++);
 		}
 		iph->tot_len = htons(skb->len - nhoff);
 		ip_send_check(iph);
-		if (tunnel) {
+		if (encap)
 			skb_reset_inner_headers(skb);
-			skb->encapsulation = 1;
-		}
 		skb->network_header = (u8 *)iph - skb->head;
 	} while ((skb = skb->next));
 


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