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Message-ID: <20230208164807.291d232f@kernel.org>
Date: Wed, 8 Feb 2023 16:48:07 -0800
From: Jakub Kicinski <kuba@...nel.org>
To: Jason Gunthorpe <jgg@...dia.com>
Cc: Saeed Mahameed <saeed@...nel.org>,
Leon Romanovsky <leon@...nel.org>,
"David S. Miller" <davem@...emloft.net>,
Paolo Abeni <pabeni@...hat.com>,
Eric Dumazet <edumazet@...gle.com>,
Saeed Mahameed <saeedm@...dia.com>, linux-rdma@...r.kernel.org,
netdev@...r.kernel.org
Subject: Re: pull-request: mlx5-next 2023-01-24 V2
On Wed, 8 Feb 2023 20:27:17 -0400 Jason Gunthorpe wrote:
> On Wed, Feb 08, 2023 at 03:19:22PM -0800, Jakub Kicinski wrote:
> > On Wed, 8 Feb 2023 12:13:00 -0400 Jason Gunthorpe wrote:
> > > I can't accept yours because it means RDMA stops existing. So we must
> > > continue with what has been done for the last 15 years - RDMA
> > > (selectively) mirrors the IP and everything running at or below the IP
> > > header level.
> >
> > Re-implement bits you need for configuration, not stop existing.
>
> This is completely technically infeasible. They share IP addresess, we
> cannot have two stacks running IPSEC on top of othe same IP address
> without co-ordinating. Almost every part is like that to some degree.
>
> And even if we somehow did keep things 100% seperated, with seperated
> IPs - Linus isn't going to let me copy and paste the huge swaths of
> core netdev code required to do IP stuff (arp, nd, routing, icmp,
> bonding, etc) into RDMA for a reason like this.
>
> So, it really is a complete death blow to demand to keep these things
> separated.
>
> Let alone what would happen if we applied the same logic to all the
> places sharing the IP with HW - remember iscsi? FCoE?
Who said IP configuration.
> > > What do you mean? "make it all the same" can be done with private or
> > > open standards?
> >
> > Oh. If it's someone private specs its probably irrelevant to the open
> > source community?
>
> No, it's what I said I dislike. Private specs, private HW, private
> userspace, proprietary kernel forks, but people still try to get
> incomplete pieces of stuff into the mainline kernel.
>
> > Sad situation. Not my employer and not in netdev, I hope.
>
> AFAIK your and my employer have done a good job together on joint
> projects over the years and have managed to end up with open source
> user spaces for almost everything subtantive in the kernel.
Great. Let's make a note of that so there are not more accusations
that my objectives for netdev are somehow driven by evil hyperscalers.
> > > I have no idea how you are jumping to some conclusion that since the
> > > RDMA team made their patches it somehow has anything to do with the
> > > work Leon and the netdev team will deliver in future?
> >
> > We shouldn't reneg what was agreed on earlier.
>
> Who reneg'd? We always said we'd do it and we are still saying we plan
> to do it.
>
> > > Hasn't our netdev team done enough work on TC stuff to earn some
> > > faith that we do actually care about TC as part of our portfolio?
> >
> > Shouldn't have brought it up in the past discussion then :|
> > Being asked to implement something tangential to your goals for
> > the community to accept your code is hardly unheard of.
>
> We agreed to implement. I'm asking for patience since we have a good
> historical track record.
If you can't make a strong commitment, what's the point in time,
at which if I were angry that the tc redirect was not posted yet -
you'd consider it understandable?
Perhaps that's sufficiently not legally binding? :)
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