Qnap / mv643xx_eth link dropping

[JM <fijam@archlinux.us>]

Hello,

I recently upgraded my LAN to 1Gbps and noticed that file transfers
from my NAS would be interrupted.

The device is QNAP TS-212P (kirkwood-ts219-6282), running kernel 4.3.3
from testing. The ethernet driver is mv643xx_eth. On file transfer
from a samba share or via FTP the connection would drop with the
following in the dmesg:

[561165.915170] mv643xx_eth_port mv643xx_eth_port.0 eth0: link down
[561165.921611] mv643xx_eth_port mv643xx_eth_port.0 eth0: link up,
1000 Mb/s, full duplex, flow control disabled

I would need to physically re-plug the ethernet cable to restore it.

Has anyone come across this issue?

Regards,
JM