Merge branch 'net-hns3-add-three-optimizations-for-mailbox-handling'

Huazhong Tan says:

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net: hns3: add three optimizations for mailbox handling

This patchset includes three code optimizations for mailbox handling.

[patch 1] adds a response code conversion.
[patch 2] refactors some structure definitions about PF and
VF mailbox.
[patch 3] refactors the condition whether PF responds VF's mailbox.
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Signed-off-by: David S. Miller <davem@davemloft.net>