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

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Message-ID: <20250727200126.2682aa39@hermes.local>
Date: Sun, 27 Jul 2025 20:01:26 -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 Wed, 23 Jul 2025 15:16:22 -0700
Jakub Kicinski <kuba@...nel.org> wrote:

> On Wed, 23 Jul 2025 20:18:03 +0000 Haiyang Zhang wrote:
> > > > Btw, if I understand this correctly. This is for future development so
> > > > it's not a blocker for this patch?    
> > >
> > > Not a blocker, I'm just giving an example of the netvsc auto-weirdness
> > > being a source of tech debt and bugs. Commit d7501e076d859d is another
> > > recent one off the top of my head. IIUC systemd-networkd is broadly
> > > deployed now. It'd be great if there was some migration plan for moving
> > > this sort of VM auto-bonding to user space (with the use of the common
> > > bonding driver, not each hypervisor rolling its own).    
> > 
> > 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.