netdev - Re: [PATCH net-next v2 0/3] VGT+ support

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Message-ID: <20191105151031.1e7c6bbc@cakuba.netronome.com>
Date:   Tue, 5 Nov 2019 15:10:31 -0800
From:   Jakub Kicinski <jakub.kicinski@...ronome.com>
To:     Saeed Mahameed <saeedm@...lanox.com>
Cc:     "sbrivio@...hat.com" <sbrivio@...hat.com>,
        "nikolay@...ulusnetworks.com" <nikolay@...ulusnetworks.com>,
        "dsahern@...il.com" <dsahern@...il.com>,
        "sd@...asysnail.net" <sd@...asysnail.net>,
        Jiri Pirko <jiri@...lanox.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "stephen@...workplumber.org" <stephen@...workplumber.org>,
        Ariel Levkovich <lariel@...lanox.com>
Subject: Re: [PATCH net-next v2 0/3] VGT+ support

On Tue, 5 Nov 2019 22:52:18 +0000, Saeed Mahameed wrote:
> > > it should be just like ethtool we want to to replace it but we know
> > > we are not there yet, so we carefully add only necessary things
> > > with
> > > lots of auditing, same should go here.  
> > 
> > Worked out amazingly for ethtool, right?  
> 
> Obviously, no one would have agreed to such total shutdown for ethtool,
> we eventually decided not to block ethtool unless we have the netlink
> adapter working .. legacy mode should get the same treatment.
> 
> Bottom line for the same reason we decided that ethtool is not totally
> dead until ethtool netlink interface is complete, we should still
> support selective and basic sriov legacy mode extensions until bridge
> offloads is complete. 

But switchdev _is_ _here_. _Today_. From uAPI perspective it's done,
and ready. We're missing the driver and user space parts, but no core
and uAPI extensions. It's just L2 switching and there's quite a few
switch drivers upstream, as I'm sure you know :/ 

ethtool is not ready from uAPI perspective, still.

It'd be more accurate to compare to legacy IOCTLs, like arguing that 
we need a small tweak to IOCTLs when Netlink is already there..