net core: Add protodown support.
This patch introduces the proto_down flag that can be used by user space applications to notify switch drivers that errors have been detected on the device. The switch driver can react to protodown notification by doing a phys down on the associated switch port. Signed-off-by: NAnuradha Karuppiah <anuradhak@cumulusnetworks.com> Signed-off-by: NAndy Gospodarek <gospo@cumulusnetworks.com> Signed-off-by: NRoopa Prabhu <roopa@cumulusnetworks.com> Signed-off-by: NWilson Kok <wkok@cumulusnetworks.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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