Merge branch 'xen-netback-hash'

Jan Beulich says:

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xen-netback: hash mapping handling adjustments

First and foremost the fix for XSA-270. On top of that further changes
which looked desirable to me while investigating that XSA.

1: fix input validation in xenvif_set_hash_mapping()
2: validate queue numbers in xenvif_set_hash_mapping()
3: handle page straddling in xenvif_set_hash_mapping()
====================

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Signed-off-by: David S. Miller <davem@davemloft.net>