net_device_stats questions

[rask@xxxxxxxxxx (Rask Ingemann Lambertsen)]

Hi.

When updating net_device_stats.tx_bytes, should I just add skb->len (like e.g. 
tulip does) or add skb->len plus any padding (like e.g. 3c59x does)?

Let's say a TX heartbeat error occurs. Am I then supposed to update both 
net_device_stats.tx_errors and net_device_stats.tx_heartbeat_errors or just 
net_device_stats.tx_heartbeat_errors?

Which events should cause an update of net_device_stats.tx_aborted?

Regards,
Rask Ingemann Lambertsen