TX counters not updated on wireguard interface

[Baptiste Jonglez]

Hi,

While trying 0.0.20170421-2 on Debian jessie, I noticed that the TX
counters are not updated:

$ ip -s link show
7: wg: <POINTOPOINT,NOARP,UP,LOWER_UP> mtu 1420 qdisc noqueue state UNKNOWN mode DEFAULT group default
    link/none
    RX: bytes  packets  errors  dropped overrun mcast
    4384059324 4073303  0       0       0       0
    TX: bytes  packets  errors  dropped carrier collsns
    0          0        0       0       0       0

This is after a bidirectional TCP iperf, so they has been some trafic in
both directions.  Bandwidth monitors like bmon also don't show any
outgoing trafic.

Baptiste
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