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vlan: adds drops accounting

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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>
This commit is contained in:
Eric Dumazet 2009-09-03 00:39:16 +00:00 committed by David S. Miller
parent 2c11455321
commit 1a123a3168
1 changed files with 22 additions and 7 deletions
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29
net/8021q/vlan_dev.c
View file

@ -294,6 +294,8 @@ static netdev_tx_t vlan_dev_hard_start_xmit(struct sk_buff *skb,
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 @@ static netdev_tx_t vlan_dev_hard_start_xmit(struct sk_buff *skb,
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 @@ static netdev_tx_t vlan_dev_hwaccel_hard_start_xmit(struct sk_buff *skb,
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;
}