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i40e: implement VF stats NDO
Implement the VF stats gathering via the kernel via ndo_get_vf_stats().
The driver will show per-VF stats in the output of the command:
ip -s link show dev <PF>
Testing Hints:
ip -s link show dev eth0
will return non-zero VF stats.
...
vf 0 MAC 00:55:aa:00:55:aa, spoof checking on, link-state enable, trust off
RX: bytes packets mcast bcast
128000 1000 104 104
TX: bytes packets
128000 1000
Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>