net: hns3: reallocate tx/rx buffer after changing mtu
When changing the mtu, the max frame size also will be changed. The tx buffer size and the rx buffer size to be allocated are determined by max frame size. So when max frame size is changed, the tx buffer and rx buffer need to be reallocated. When the tc_num is changed, the tx buffer and rx buffer need to be reallocated too. So calling set_mtu and buffer_alloc separately is better. Signed-off-by: NFuyun Liang <liangfuyun1@huawei.com> Signed-off-by: NPeng Li <lipeng321@huawei.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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