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Subject: Re: [Intel-wired-lan] [PATCH net] i40e: Prevent unwanted interface name changes X-BeenThere: intel-wired-lan@osuosl.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Intel Wired Ethernet Linux Kernel Driver Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Ivan Vecera , netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Jedrzej Jagielski , Andrew Lunn , Eric Dumazet , Tony Nguyen , intel-wired-lan@lists.osuosl.org, Jakub Kicinski , Paolo Abeni , "David S. Miller" Errors-To: intel-wired-lan-bounces@osuosl.org Sender: "Intel-wired-lan" On 8/21/25 16:23, Calvin Owens wrote: > On Thursday 08/21 at 10:00 +0200, Przemek Kitszel wrote: >> On 8/20/25 19:41, Calvin Owens wrote: >>> On Wednesday 08/20 at 08:31 -0700, Calvin Owens wrote: >>>> On Wednesday 08/20 at 08:42 +0200, Michal Schmidt wrote: >>>>> On Wed, Aug 20, 2025 at 6:30 AM Calvin Owens wrote: >>>>>> The same naming regression which was reported in ixgbe and fixed in >>>>>> commit e67a0bc3ed4f ("ixgbe: prevent from unwanted interface name >>>>>> changes") still exists in i40e. >>>>>> >>>>>> Fix i40e by setting the same flag, added in commit c5ec7f49b480 >>>>>> ("devlink: let driver opt out of automatic phys_port_name generation"). >>>>>> >>>>>> Fixes: 9e479d64dc58 ("i40e: Add initial devlink support") >>>>> >>>>> But this one's almost two years old. By now, there may be more users >>>>> relying on the new name than on the old one. >>>>> Michal >>>> >>>> Well, I was relying on the new ixgbe names, and I had to revert them >>>> all in a bunch of configs yesterday after e67a0bc3ed4f :) >> >> we have fixed (changed to old naming scheme) ixgbe right after the >> kernel was used by real users (modulo usual delay needed to invent >> a good solution) > > No, the "fix" actually broke me for a *second time*, because I'd > already converted my infrastructure to use the *new* names, which match > i40e and the rest of the world. > > We've seen *two* user ABI regressions in the last several months in > ixgbe now, both of which completely broke networking on the system. > > I'm not here to whine about that: I just want to save as many people out > there in the real world as I can the trouble of having to do the same > work (which has absolutely no benefit) over the next five years in i40e. > > If it's acceptable to break me for a second time to "fix" this, because > I'm the minority of users (a viewpoint I am in agreement with), it > should also be acceptable to break the minority of i40e users who are > running newer kernels to "fix" it there too. > > Why isn't it? I think we agree that it is ok-ish to sometime break setups for bleeding edge users, then fix (aka undo). It's bad that this time it was with effect equivalent to the first breakage (hope that it was easier to fix locally when it occurred second time in a row). But we dispute over change from Oct 2023, for me it is carved in stone at this point. Every user either adjusted or worked it around [1] > >>> >>> And, even if it is e67a0bc3ed4f that introduced it, v6.7 was the first >>> release with it. I strongly suspect most servers with i40e NICs running >>> in the wild are running older kernels than that, and have not yet >>> encountered the naming regression. But you probably have much better >>> data about that than I do :) >> >> RedHat patches their kernels with current code of the drivers that their >> customers use (including i40e and ixgbe) >> One could expect that changes made today to those will reach RHEL 10.3, >> even if it would be named "kernel 6.12". >> >> (*) the changes will likely be also in 10.2, but I don't want to make >> any promises from Intel or Redhat here > > But how many i40e users are actually on the most recent version of RHEL? > Not very many, is my guess. RHEL9 is 5.14, and has the old behavior. RHEL 9 backported devlink for i40e in July 2024 [0], together with undo of interface name change [1] (this likely tells why there were zero complains from RH users). [0] https://gitlab.com/redhat/centos-stream/src/kernel/centos-stream-9/-/commit/bcbc349375ecd977aa429c3eff4d182b74dcdd8a [1] https://gitlab.com/redhat/centos-stream/src/kernel/centos-stream-9/-/commit/5ab8aa31dc2b44fbd6761bb19463f5427b9be245 > > If you actually have data on that, obviously that's different. But it > sounds like you're guessing just like I am. I could only guess about other OS Vendors, one could check it also for Ubuntu in their public git, but I don't think we need more data, as ultimate judge here are Stable Maintainers From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.11]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id BC51E35082F; Thu, 21 Aug 2025 20:39:28 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=192.198.163.11 ARC-Seal:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755808770; cv=fail; b=Xayt1fNZIRLl9TjJTk8biWhPowwd2m4GklMsZZR2FWtMvCGaHjeHjqtBwX/W5Pl5aLCx96IGMA/GQlR/gvBeFZtmA/S+oGY8IhrzSwKHhWlYFUKlGb9KvyttM9dJ9I9/PSFzLofWn56u1YliLuMXCix7N7pnr1vclhKb+oZ6tYo= ARC-Message-Signature:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755808770; c=relaxed/simple; bh=FczZ+0UsFZROEojNBWQlkfiPQzs+GPGQIy4Jh4N3k4E=; 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By now, there may be more users >>>>> relying on the new name than on the old one. >>>>> Michal >>>> >>>> Well, I was relying on the new ixgbe names, and I had to revert them >>>> all in a bunch of configs yesterday after e67a0bc3ed4f :) >> >> we have fixed (changed to old naming scheme) ixgbe right after the >> kernel was used by real users (modulo usual delay needed to invent >> a good solution) > > No, the "fix" actually broke me for a *second time*, because I'd > already converted my infrastructure to use the *new* names, which match > i40e and the rest of the world. > > We've seen *two* user ABI regressions in the last several months in > ixgbe now, both of which completely broke networking on the system. > > I'm not here to whine about that: I just want to save as many people out > there in the real world as I can the trouble of having to do the same > work (which has absolutely no benefit) over the next five years in i40e. > > If it's acceptable to break me for a second time to "fix" this, because > I'm the minority of users (a viewpoint I am in agreement with), it > should also be acceptable to break the minority of i40e users who are > running newer kernels to "fix" it there too. > > Why isn't it? I think we agree that it is ok-ish to sometime break setups for bleeding edge users, then fix (aka undo). It's bad that this time it was with effect equivalent to the first breakage (hope that it was easier to fix locally when it occurred second time in a row). But we dispute over change from Oct 2023, for me it is carved in stone at this point. Every user either adjusted or worked it around [1] > >>> >>> And, even if it is e67a0bc3ed4f that introduced it, v6.7 was the first >>> release with it. I strongly suspect most servers with i40e NICs running >>> in the wild are running older kernels than that, and have not yet >>> encountered the naming regression. But you probably have much better >>> data about that than I do :) >> >> RedHat patches their kernels with current code of the drivers that their >> customers use (including i40e and ixgbe) >> One could expect that changes made today to those will reach RHEL 10.3, >> even if it would be named "kernel 6.12". >> >> (*) the changes will likely be also in 10.2, but I don't want to make >> any promises from Intel or Redhat here > > But how many i40e users are actually on the most recent version of RHEL? > Not very many, is my guess. RHEL9 is 5.14, and has the old behavior. RHEL 9 backported devlink for i40e in July 2024 [0], together with undo of interface name change [1] (this likely tells why there were zero complains from RH users). [0] https://gitlab.com/redhat/centos-stream/src/kernel/centos-stream-9/-/commit/bcbc349375ecd977aa429c3eff4d182b74dcdd8a [1] https://gitlab.com/redhat/centos-stream/src/kernel/centos-stream-9/-/commit/5ab8aa31dc2b44fbd6761bb19463f5427b9be245 > > If you actually have data on that, obviously that's different. But it > sounds like you're guessing just like I am. I could only guess about other OS Vendors, one could check it also for Ubuntu in their public git, but I don't think we need more data, as ultimate judge here are Stable Maintainers