igb: Correctly determine pci-e function number in virtual environment
When running in a virtual environment the ports of an 82575/6 can appear to be single function devices which is not correct. To resolve this we rely on the function number stored in the status register. Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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