[ECOS] Re: How to get Ethernet link status?

Kelvin Lawson news@kibosh.org
Wed Dec 17 17:47:00 GMT 2008

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().


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