Re: BUG: igc: Unable to select 100 Mbps speed mode

[Ferenc Fejes <fejes@inf.elte.hu>]

Hi Vinicius,

On Fri, 2023-12-01 at 15:40 -0800, Vinicius Costa Gomes wrote:
> Hi,
> 
> Ferenc Fejes <fejes@inf.elte.hu> writes:
> 
> > Hi!
> > 
> > I upgraded from Ubuntu 23.04 to 23.10, the default Linux version
> > changed from 6.2 to 6.5.
> > 
> > We immediately noticed that we cannot set 100 Mbps mode on i225
> > with
> > the new kernel.
> > 
> > E.g.:
> > sudo ethtool -s enp4s0 speed 100 duplex full
> > dmesg:
> > [   60.304330] igc 0000:03:00.0 enp3s0: NIC Link is Down
> > [   62.582764] igc 0000:03:00.0 enp3s0: NIC Link is Up 2500 Mbps
> > Full
> > Duplex, Flow Control: RX/TX
> > 
> 
> I wonder if this patch fixes it, and it is still not available in
> your
> distro:
> 
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=e7684d29efdf37304c62bb337ea55b3428ca118e

Will take a look, thanks. I'm not familiar Ubuntu's versioning and
custom patches, nor their backport policy.

However their "mantic" tree (6.5) looks like this:
https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/mantic/tree/drivers/net/ethernet/intel/igc/igc_ethtool.c#n1804

So the patch above not applied there.

> 
> > I just switched back to 6.2 and with that it works correctly.
> > 
> > Sorry if this has already been addressed, after a quick search in
> > the
> > lore I cannot find anything related.
> > 
> 
> I think it was discussed here:
> 
> https://lore.kernel.org/all/20230922163804.7DDBA2440449@us122.sjc.aristanetworks.com/

Thank you, look like I missed it. Sorry for the noise!

> 
> > Best,
> > Ferenc
> > 
> 
> 
> Cheers,

Best,
Ferenc