net: hns3: minor refactor related to desc_cb handling
desc_cb is used to store mapping and freeing info for the corresponding desc, which is used in the cleaning process. There will be more desc_cb type coming up when supporting the tx bounce buffer, change desc_cb type to bit-wise value in order to reduce the desc_cb type checking operation in the data path. Also move the desc_cb type definition to hns3_enet.h because it is only used in hns3_enet.c, and declare a local variable desc_cb in hns3_clear_desc() to reduce lines of code. Signed-off-by: Yunsheng Lin <linyunsheng@huawei.com> Signed-off-by: Guangbin Huang <huangguangbin2@huawei.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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