Merge branch 'hns3-Some-cleanup-and-bugfix-for-desc-filling'

Yunsheng Lin says:

====================
Some cleanup and bugfix for desc filling

When retransmiting packets, skb_cow_head which is called in
hns3_set_tso may clone a new header. And driver will clear the
checksum of the header after doing DMA map, so HW will read the
old header whose L3 checksum is not cleared and calculate a
wrong L3 checksum.

Also When sending a big fragment using multiple buffer descriptor,
hns3 does one maping, but do multiple unmapping when tx is done,
which may cause unmapping problem.

This patchset does some cleanup before fixing the above problem.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

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