vlan: adds drops accounting
Its hard to tell if vlans are dropping frames, since
every frame given to vlan_???_start_xmit() functions
is accounted as fully transmitted by lower device.
We can test dev_queue_xmit() return values to
properly account for dropped frames.
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/8021q/vlan_dev.c b/net/8021q/vlan_dev.c
index 3938c3e..4198ec5 100644
--- a/net/8021q/vlan_dev.c
+++ b/net/8021q/vlan_dev.c
@@ -294,6 +294,8 @@
int i = skb_get_queue_mapping(skb);
struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
+ unsigned int len;
+ int ret;
/* Handle non-VLAN frames if they are sent to us, for example by DHCP.
*
@@ -319,11 +321,17 @@
vlan_dev_info(dev)->cnt_inc_headroom_on_tx++;
}
- txq->tx_packets++;
- txq->tx_bytes += skb->len;
skb->dev = vlan_dev_info(dev)->real_dev;
- dev_queue_xmit(skb);
+ len = skb->len;
+ ret = dev_queue_xmit(skb);
+
+ if (likely(ret == NET_XMIT_SUCCESS)) {
+ txq->tx_packets++;
+ txq->tx_bytes += len;
+ } else
+ txq->tx_dropped++;
+
return NETDEV_TX_OK;
}
@@ -333,16 +341,23 @@
int i = skb_get_queue_mapping(skb);
struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
u16 vlan_tci;
+ unsigned int len;
+ int ret;
vlan_tci = vlan_dev_info(dev)->vlan_id;
vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb);
skb = __vlan_hwaccel_put_tag(skb, vlan_tci);
- txq->tx_packets++;
- txq->tx_bytes += skb->len;
-
skb->dev = vlan_dev_info(dev)->real_dev;
- dev_queue_xmit(skb);
+ len = skb->len;
+ ret = dev_queue_xmit(skb);
+
+ if (likely(ret == NET_XMIT_SUCCESS)) {
+ txq->tx_packets++;
+ txq->tx_bytes += len;
+ } else
+ txq->tx_dropped++;
+
return NETDEV_TX_OK;
}