Hi Grant,
What is the official method used to get the link status of an
interface (up/down, 10/100/1000, full/half duplex)?
I don't see any hooks in the Ethernet driver API. Are drivers
supposed to export that info as global variables somehow? Are
they supposed to provide a global function to call?
A standard way of doing this would be to use the ioctl SIOCGETIFMEDIA,
and check the IFM_AVALID and IFM_ACTIVE flags in the IFM status returned.
We did this by adding a new query "ETH_DRV_GET_MEDIA_STATUS" in the
ethernet driver control function (xxx_control()) and adding support for
SIOCGIFMEDIA in eth_drv_ioctl().
Cheers,
Kelvin.
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