netdev - [PATCH net-next v12 1/9] openvswitch: use hard_header_len instead of hardcoded ETH

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Message-Id: <eef37b3c7e1c1deffd6a5a8cfff83cd2c82cb76b.1476708212.git.jbenc@redhat.com>
Date:   Mon, 17 Oct 2016 15:02:37 +0200
From:   Jiri Benc <jbenc@...hat.com>
To:     netdev@...r.kernel.org
Cc:     dev@...nvswitch.org, Pravin Shelar <pshelar@....org>,
        Lorand Jakab <lojakab@...co.com>,
        Simon Horman <simon.horman@...ronome.com>
Subject: [PATCH net-next v12 1/9] openvswitch: use hard_header_len instead of hardcoded ETH_HLEN

On tx, use hard_header_len while deciding whether to refragment or drop the
packet. That way, all combinations are calculated correctly:

* L2 packet going to L2 interface (the L2 header len is subtracted),
* L2 packet going to L3 interface (the L2 header is included in the packet
  lenght),
* L3 packet going to L3 interface.

Signed-off-by: Jiri Benc <jbenc@...hat.com>
---
 net/openvswitch/actions.c |  3 ++-
 net/openvswitch/vport.c   | 10 ++++++----
 2 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/net/openvswitch/actions.c b/net/openvswitch/actions.c
index 1105c4e29c62..49af167105d3 100644
--- a/net/openvswitch/actions.c
+++ b/net/openvswitch/actions.c
@@ -791,7 +791,8 @@ static void do_output(struct datapath *dp, struct sk_buff *skb, int out_port,
 				pskb_trim(skb, ETH_HLEN);
 		}
 
-		if (likely(!mru || (skb->len <= mru + ETH_HLEN))) {
+		if (likely(!mru ||
+		           (skb->len <= mru + vport->dev->hard_header_len))) {
 			ovs_vport_send(vport, skb);
 		} else if (mru <= vport->dev->mtu) {
 			struct net *net = read_pnet(&dp->net);
diff --git a/net/openvswitch/vport.c b/net/openvswitch/vport.c
index 7387418ac514..d5550fd6a013 100644
--- a/net/openvswitch/vport.c
+++ b/net/openvswitch/vport.c
@@ -481,9 +481,10 @@ void ovs_vport_deferred_free(struct vport *vport)
 }
 EXPORT_SYMBOL_GPL(ovs_vport_deferred_free);
 
-static unsigned int packet_length(const struct sk_buff *skb)
+static unsigned int packet_length(const struct sk_buff *skb,
+				  struct net_device *dev)
 {
-	unsigned int length = skb->len - ETH_HLEN;
+	unsigned int length = skb->len - dev->hard_header_len;
 
 	if (!skb_vlan_tag_present(skb) &&
 	    eth_type_vlan(skb->protocol))
@@ -501,10 +502,11 @@ void ovs_vport_send(struct vport *vport, struct sk_buff *skb)
 {
 	int mtu = vport->dev->mtu;
 
-	if (unlikely(packet_length(skb) > mtu && !skb_is_gso(skb))) {
+	if (unlikely(packet_length(skb, vport->dev) > mtu &&
+		     !skb_is_gso(skb))) {
 		net_warn_ratelimited("%s: dropped over-mtu packet: %d > %d\n",
 				     vport->dev->name,
-				     packet_length(skb), mtu);
+				     packet_length(skb, vport->dev), mtu);
 		vport->dev->stats.tx_errors++;
 		goto drop;
 	}
-- 
1.8.3.1