Re: [E1000-devel] False ethtool report on Link Detection

[Anand R. M. <an...@gm...>]

On Tue, Mar 26, 2013 at 8:34 PM, Tantilov, Emil S
<emi...@in...> wrote:
>>-----Original Message-----
>>From: Anand Raj Manickam [mailto:an...@gm...]
>>Sent: Tuesday, March 26, 2013 5:04 AM
>>To: Waskiewicz Jr, Peter P
>>Cc: e10...@li...
>>Subject: Re: [E1000-devel] False ethtool report on Link Detection
>>
>>On Tue, Mar 26, 2013 at 12:09 PM, Waskiewicz Jr, Peter P
>><pet...@in...> wrote:
>>> On 3/25/2013 10:56 PM, Anand Raj Manickam wrote:
>>>>
>>>> I m using the e1000e driver for Intel 82574L chipset .
>>>> When the cable is plugged in and Auto Negotiated , It reports as Link
>>>> Detected as NO. I need to do a ifconfig up eth3 to get the Link
>>>> Detected as YES .
>
> This is the correct behavior. The Link status in this case is reported by ethtool, not the driver:
>
> Look in net/core/ethtool.c in your kernel source:
>
> u32 ethtool_op_get_link(struct net_device *dev)
> {
>         return netif_carrier_ok(dev) ? 1 : 0;
>
> This behavior should be consistent across all drivers that provide this info. From what I can see struct ethtool_cmd which carries this information does not have a link member.
>
> Thanks,
> Emil

As per my debug , it seems to pick from netdev.c in driver e1000_mii_ioctl()


But realtek reports it right .. When the Link is plugged - ethtool
reports Link Detected YES. even though the ifconfig eth3 down is set.
When the Link is plugged in i would like my Link Detected to be YES