Merge branch 'mlx5-hyperv'

Haiyang Zhang says:

====================
Add software backchannel and mlx5e HV VHCA stats

This patch set adds paravirtual backchannel in software in pci_hyperv,
which is required by the mlx5e driver HV VHCA stats agent.

The stats agent is responsible on running a periodic rx/tx packets/bytes
stats update.
====================

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