netdev - RE: [REGRESSION] ixgbe broken after devlink support patch

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Message-ID:
 <LV3PR12MB9265653CF3481A750615D00B9473A@LV3PR12MB9265.namprd12.prod.outlook.com>
Date: Tue, 17 Jun 2025 14:29:40 +0000
From: "Kaplan, David" <David.Kaplan@....com>
To: Przemek Kitszel <przemyslaw.kitszel@...el.com>,
	"jedrzej.jagielski@...el.com" <jedrzej.jagielski@...el.com>
CC: "anthony.l.nguyen@...el.com" <anthony.l.nguyen@...el.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>, "horms@...nel.org"
	<horms@...nel.org>, Mateusz Polchlopek <mateusz.polchlopek@...el.com>,
	Bharath R <bharath.r@...el.com>, "regressions@...ts.linux.dev"
	<regressions@...ts.linux.dev>, "intel-wired-lan@...ts.osuosl.org"
	<intel-wired-lan@...ts.osuosl.org>
Subject: RE: [REGRESSION] ixgbe broken after devlink support patch

[AMD Official Use Only - AMD Internal Distribution Only]

> -----Original Message-----
> From: Przemek Kitszel <przemyslaw.kitszel@...el.com>
> Sent: Tuesday, June 17, 2025 4:01 AM
> To: Kaplan, David <David.Kaplan@....com>; jedrzej.jagielski@...el.com
> Cc: anthony.l.nguyen@...el.com; netdev@...r.kernel.org; horms@...nel.org;
> Mateusz Polchlopek <mateusz.polchlopek@...el.com>; Bharath R
> <bharath.r@...el.com>; regressions@...ts.linux.dev; intel-wired-
> lan@...ts.osuosl.org
> Subject: Re: [REGRESSION] ixgbe broken after devlink support patch
>
> Caution: This message originated from an External Source. Use proper caution
> when opening attachments, clicking links, or responding.
>
>
> On 6/16/25 21:42, Kaplan, David wrote:
> > [AMD Official Use Only - AMD Internal Distribution Only]
> >
> > Hi,
> >
> > My "Ethernet controller: Intel Corporation Ethernet Controller 10G X550T (rev 01)"
> device stopped working on recent kernel builds (fails to show up in 'ifconfig' or to get
> an IP address).  I bisected the failure down to the following commit:
> >
> > commit a0285236ab93fdfdd1008afaa04561d142d6c276 (HEAD, refs/bisect/bad)
> > Author: Jedrzej Jagielski <jedrzej.jagielski@...el.com>
> > Date:   Thu Apr 10 14:59:56 2025 +0200
> >
> >      ixgbe: add initial devlink support
>
> [..]
>
> > Normally, the device is given a name like enp194s0f0 and connects to the wired
> network.
>
> now the name is likely to be different, please see this thread:
> https://lkml.org/lkml/2025/4/24/1750
>
> Is it possible that your network setup script has some part of interface
> discovery hardcoded?
>

Thanks for the pointer, that seemed to be the issue.  I was running Ubuntu 22.04.5 LTS and I had to edit /etc/netplan/01-netcfg.yaml to add the new name (which was the old name with 'np0' at the end) and enable dhcp for it.

This is a very unfortunate regression as all I did was update my kernel and then my system dropped offline.  It took many hours of debugging to determine what was happening and then had to log in locally to fix it.  There were no messages in dmesg that I could find that gave any clue as to what happened or where to look.

Per https://www.kernel.org/doc/html/latest/admin-guide/reporting-regressions.html, to me this clearly qualifies as a regression because in no way was I prepared for my system to randomly drop offline just because I updated the kernel.

--David Kaplan