openvswitch: Unify vport error stats handling.

Following patch changes vport->send return type so that vport
layer can do error accounting.

Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
Signed-off-by: Jesse Gross <jesse@nicira.com>

3 files changed, 11 insertions, 6 deletions

diff --git a/net/openvswitch/vport-netdev.c b/net/openvswitch/vport-netdev.c
index 4f01c6d2ffa4..43712217a372 100644
--- a/net/openvswitch/vport-netdev.c
+++ b/net/openvswitch/vport-netdev.c
@@ -170,7 +170,7 @@ static int netdev_send(struct vport *vport, struct sk_buff *skb)
                 net_warn_ratelimited("%s: dropped over-mtu packet: %d > %d\n",
                                      netdev_vport->dev->name,
                                      packet_length(skb), mtu);
-                goto error;
+                goto drop;
         }
 
         skb->dev = netdev_vport->dev;
@@ -179,9 +179,8 @@ static int netdev_send(struct vport *vport, struct sk_buff *skb)
 
         return len;
 
-error:
+drop:
         kfree_skb(skb);
-        ovs_vport_record_error(vport, VPORT_E_TX_DROPPED);
         return 0;
 }
 
diff --git a/net/openvswitch/vport.c b/net/openvswitch/vport.c
index 720623190eaa..7f20f6d1be94 100644
--- a/net/openvswitch/vport.c
+++ b/net/openvswitch/vport.c
@@ -351,7 +351,7 @@ int ovs_vport_send(struct vport *vport, struct sk_buff *skb)
 {
         int sent = vport->ops->send(vport, skb);
 
-        if (likely(sent)) {
+        if (likely(sent > 0)) {
                 struct pcpu_tstats *stats;
 
                 stats = this_cpu_ptr(vport->percpu_stats);
@@ -360,7 +360,12 @@ int ovs_vport_send(struct vport *vport, struct sk_buff *skb)
                 stats->tx_packets++;
                 stats->tx_bytes += sent;
                 u64_stats_update_end(&stats->syncp);
-        }
+        } else if (sent < 0) {
+                ovs_vport_record_error(vport, VPORT_E_TX_ERROR);
+                kfree_skb(skb);
+        } else
+                ovs_vport_record_error(vport, VPORT_E_TX_DROPPED);
+
         return sent;
 }
 
diff --git a/net/openvswitch/vport.h b/net/openvswitch/vport.h
index 26c594b1a470..1cef5cd3be47 100644
--- a/net/openvswitch/vport.h
+++ b/net/openvswitch/vport.h
@@ -123,7 +123,8 @@ struct vport_parms {
  * existing vport to a &struct sk_buff.  May be %NULL for a vport that does not
  * have any configuration.
  * @get_name: Get the device's name.
- * @send: Send a packet on the device.  Returns the length of the packet sent.
+ * @send: Send a packet on the device.  Returns the length of the packet sent,
+ * zero for dropped packets or negative for error.
  */
 struct vport_ops {
         enum ovs_vport_type type;