net: hns3: add support to set/get rx buf len via ethtool for hns3 driver
Rx buf len is for rx BD buffer size, support setting it via ethtool -G parameter and getting it via ethtool -g parameter. Signed-off-by: Hao Chen <chenhao288@hisilicon.com> Signed-off-by: Guangbin Huang <huangguangbin2@huawei.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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