netdev - Re: [PATCH RESEND] netvsc: transfer lower device max tso size

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Message-ID: <20250728102403.14269ea7@hermes.local>
Date: Mon, 28 Jul 2025 10:24:03 -0700
From: Stephen Hemminger <stephen@...workplumber.org>
To: Jakub Kicinski <kuba@...nel.org>
Cc: Haiyang Zhang <haiyangz@...rosoft.com>, Jason Wang
 <jasowang@...hat.com>, Cindy Lu <lulu@...hat.com>, KY Srinivasan
 <kys@...rosoft.com>, Wei Liu <wei.liu@...nel.org>, Dexuan Cui
 <decui@...rosoft.com>, Andrew Lunn <andrew+netdev@...n.ch>, "David S.
 Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Paolo
 Abeni <pabeni@...hat.com>, Simon Horman <horms@...nel.org>, Michael Kelley
 <mhklinux@...look.com>, Shradha Gupta <shradhagupta@...ux.microsoft.com>,
 Kees Cook <kees@...nel.org>, Stanislav Fomichev <sdf@...ichev.me>, Kuniyuki
 Iwashima <kuniyu@...gle.com>, Alexander Lobakin
 <aleksander.lobakin@...el.com>, Guillaume Nault <gnault@...hat.com>, Joe
 Damato <jdamato@...tly.com>, Ahmed Zaki <ahmed.zaki@...el.com>, "open
 list:Hyper-V/Azure CORE AND DRIVERS" <linux-hyperv@...r.kernel.org>, "open
 list:NETWORKING DRIVERS" <netdev@...r.kernel.org>, open list
 <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH RESEND] netvsc: transfer lower device max tso size

On Mon, 28 Jul 2025 08:19:07 -0700
Jakub Kicinski <kuba@...nel.org> wrote:

> On Sun, 27 Jul 2025 20:01:26 -0700 Stephen Hemminger wrote:
> > On Wed, 23 Jul 2025 15:16:22 -0700
> > Jakub Kicinski <kuba@...nel.org> wrote:  
> > >  
> > > > Actually, we had used the common bonding driver 9 years ago. But it's
> > > > replaced by this kernel/netvsc based "transparent" bonding mode. See
> > > > the patches listed below.
> > > > 
> > > > The user mode bonding scripts were unstable, and difficult to deliver
> > > > & update for various distros. So Stephen developed the new "transparent"
> > > > bonding mode, which greatly improves the situation.      
> > > 
> > > I specifically highlighted systemd-networkd as the change in the user
> > > space landscape.    
> > 
> > Haiyang tried valiantly but getting every distro to do the right thing
> > with VF's bonding and hot plug was impossible to support.  
> 
> I understand, but I also don't want it to be an upstream Linux problem.
> 
> Again, no other cloud provider seems to have this issue, AFAIU.

The problem is that other cloud providers don't expose the VF, the hide it in HW firmware.
The userspace world is a mess, with systemd, netplan, cloud init, and the SuSe stuff.
And custom appliances that assume that there is a default eth0 device on boot.
Yes, there were users that expect to see eth0 all the time.