I believe the interface is "openned" when you do
ifconfig eth? up
where eth? is the interface in question, it could be eth0, eth1, etc,
or a totally different name if your driver gives it.

Most easy one to trigger transmit, is to "ping", which in first case
will trigger ARP to be sent.

Max


Sagar Borikar wrote:
> Hi all,
>
> I am trying to test the ethernet driver through mounting file system.
> A bit strange but the thing is that the ramdisk is not yet up and I
> wanted to check
> the xmit functionality through the ARP message that kernel sends while
> mounting the nfs.
> For that, I wanted to know when exactly does the kenel calls the device
> open function in net_device structure? Also when exactly does the
> dev->xmit will get called. If any one can give code level references,
> it will be great.
>
> Regards,
> Sagar