net: hns3: add querying fec statistics
FEC statistics can be used to check the transmission quality of links. This patch implements the get_fec_stats callback of ethtool_ops to support querying FEC statistics by command "ethtool -I --show-fec eth0". Signed-off-by: Hao Lan <lanhao@huawei.com> Signed-off-by: Guangbin Huang <huangguangbin2@huawei.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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