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Re: How to get Ethernet link status?

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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