tree 8b13f4154dca21073b6416a4d185e7e98a9a9b4f
parent 05212ba8132b42047ab5d63d759c6f9c28e7eab5
author Peng Li <lipeng321@huawei.com> 1535335169 +0800
committer David S. Miller <davem@davemloft.net> 1535591300 -0700

net: hns: add the code for cleaning pkt in chip

If there are packets in hardware when changing the speed
or duplex, it may cause hardware hang up.

This patch adds the code for waiting chip to clean the all
pkts(TX & RX) in chip when the driver uses the function named
"adjust link".

This patch cleans the pkts as follows:
1) close rx of chip, close tx of protocol stack.
2) wait rcb, ppe, mac to clean.
3) adjust link
4) open rx of chip, open tx of protocol stack.

Signed-off-by: Peng Li <lipeng321@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>