From: "Loftus, Ciara" <ciara.loftus@intel.com>
To: Ferruh Yigit <ferruh.yigit@amd.com>,
"Tahhan, Maryam" <mtahhan@redhat.com>,
"stephen@networkplumber.org" <stephen@networkplumber.org>,
"lihuisong@huawei.com" <lihuisong@huawei.com>,
"fengchengwen@huawei.com" <fengchengwen@huawei.com>,
"liuyonglong@huawei.com" <liuyonglong@huawei.com>,
"Marchand, David" <david.marchand@redhat.com>
Cc: "dev@dpdk.org" <dev@dpdk.org>,
"Koikkara Reeny, Shibin" <shibin.koikkara.reeny@intel.com>,
Kevin Traynor <ktraynor@redhat.com>,
"Luca Boccassi" <bluca@debian.org>
Subject: RE: [v7 1/1] net/af_xdp: fix multi interface support for K8s
Date: Fri, 9 Feb 2024 12:40:15 +0000 [thread overview]
Message-ID: <MW4PR11MB5872C7A2F35BE5E37F9CCB458E4B2@MW4PR11MB5872.namprd11.prod.outlook.com> (raw)
In-Reply-To: <37ebae5b-cfb0-48f9-bafb-855e59b6bdc9@amd.com>
>
> On 1/11/2024 2:21 PM, Ferruh Yigit wrote:
> > On 1/11/2024 12:21 PM, Maryam Tahhan wrote:
> >> On 11/01/2024 11:35, Ferruh Yigit wrote:
> >>> Devarg is user interface, changing it impacts the user.
> >>>
> >>> Assume that user of '22.11.3' using 'use_cni' dev_arg, it will be broken
> >>> when user upgrades DPDK to '22.11.4', which is not expected.
> >>>
> >>> dev_arg is not API/ABI but as it impacts the user, it is in the gray
> >>> area to backport to the LTS release.
> >> Fair enough
> >>> Current patch doesn't have Fixes tag or stable tag, so it doesn't
> >>> request to be backported to LTS release. I took this as an improvement,
> >>> more than a fix.
> >>
> >> This was overlooked by me apologies. It's been a while since I've
> >> contributed to DPDK and I must've missed this detail in the contribution
> >> guide.
> >>> As far as I understand existing code (that use 'use_cni' dev_arg)
> >>> supports only single netdev, this patch adds support for multiple netdevs.
> >>
> >> The use_cni implementation will no longer work with the AF_XDP DP as the
> >> use_cni was originally implemented as it has hard coded what's now an
> >> incorrect path for the UDS.
> >>
> >>> So what do you think keep LTS with 'use_cni' dev_arg, is there a
> >>> requirement to update LTS release?
> >>> If so, can it be an option to keep 'use_cni' for backward compatibility
> >>> but add only add 'uds_path' and remove 'use_cni' in next LTS?
> >>
> >>
> >> Yeah we can go back to the version of the patch that had the 'use_cni'
> >> flag that was used in combination with the path argument. We can add
> >> better documentation re the "use_cni" misnomer... What we can then do is
> >> if no path argument is set by the user assume their intent and and
> >> generate the path internally in the AF_XDP PMD (which was suggested by
> >> Shibin at some stage). That way there should be no surprises to the End
> >> User.
> >>
> >
> > Ack, this keeps backward compatibility,
> >
> > BUT if 'use_cni' is already broken in v23.11 (that is what I understand
> > from your above comment), means there is no user of it in LTS, and we
> > can be more pragmatic and replace the dev_args, by backporting this
> > patch, assuming LTS maintainer is also OK with it.
> >
>
> Hi Maryam,
>
> How do you want to continue with the patch, I think options we considered:
>
> 1. Fix 'use_cni' documentation (which we can backport to LTS) and
> overload the argument for new purpose. This will enable new feature by
> keeping backward compatibility. And requires new version of this patch.
>
> 2. If the 'use_cni' is completely broken in the 23.11 LTS, which means
> there is no user or backward compatibility to worry about, we can merge
> this patch and backport it to LTS.
>
> 3. Don't backport this fix to LTS, merge only to current release, which
> means your new feature won't be available to some users as long as a few
> years.
>
>
> (1.) is most user friendly, but if 'use_cni' already broken in LTS we
> can go with option (2.). What do you think?
>
>
>
> btw, @Ciara, @Maryam, if (2.) is true, how we end up having a feature
> ('use_cni' dev_args) completely broken in an LTS release?
My understanding is that the use_cni implementation that is available in the 23.11 LTS is compatible with a particular version of the afxdp-plugins-for-kubernetes source. Maryam's change makes it compatible with the latest version. @Maryam can you confirm this?
If my understanding is correct then I think we should include the version/tag/commit-id of afxdp-plugins-for-kubernetes that the code is compatible with. Including backporting a patch to LTS to specify what version that code is comaptible with.
>
>
>
> >
> >> Long term I would like to keep a (renamed) path argument (in case the
> >> path does ever change from the AF_XDP DP POV) and use it also in
> >> combination with another (maybe boolean) param for passing pinned bpf
> >> maps rather than another separate path.
> >>
> >> WDYT? Would this work for the LTS release?
> >>
> >>
> >
next prev parent reply other threads:[~2024-02-09 12:40 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-12-22 11:04 Maryam Tahhan
2024-01-10 14:58 ` Maryam Tahhan
2024-01-10 15:21 ` Ferruh Yigit
2024-01-11 9:01 ` Maryam Tahhan
2024-01-11 11:35 ` Ferruh Yigit
2024-01-11 12:21 ` Maryam Tahhan
2024-01-11 13:28 ` Kevin Traynor
2024-01-11 14:21 ` Ferruh Yigit
2024-02-07 23:24 ` Ferruh Yigit
2024-02-09 12:40 ` Loftus, Ciara [this message]
2024-02-09 16:52 ` Maryam Tahhan
2024-02-09 18:07 ` Ferruh Yigit
2024-02-09 17:02 ` Maryam Tahhan
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=MW4PR11MB5872C7A2F35BE5E37F9CCB458E4B2@MW4PR11MB5872.namprd11.prod.outlook.com \
--to=ciara.loftus@intel.com \
--cc=bluca@debian.org \
--cc=david.marchand@redhat.com \
--cc=dev@dpdk.org \
--cc=fengchengwen@huawei.com \
--cc=ferruh.yigit@amd.com \
--cc=ktraynor@redhat.com \
--cc=lihuisong@huawei.com \
--cc=liuyonglong@huawei.com \
--cc=mtahhan@redhat.com \
--cc=shibin.koikkara.reeny@intel.com \
--cc=stephen@networkplumber.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).