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

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Message-ID: <CACGkMEvwAqY2dRYLnUnVvprjoH8uoyeHN9CB9=-xRUE80m6JSg@mail.gmail.com>
Date: Tue, 29 Jul 2025 10:42:02 +0800
From: Jason Wang <jasowang@...hat.com>
To: Jakub Kicinski <kuba@...nel.org>
Cc: Stephen Hemminger <stephen@...workplumber.org>, Haiyang Zhang <haiyangz@...rosoft.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, Jul 28, 2025 at 11:19 PM 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.
>

There's a failover module which is used by virtio-net now. Maybe
that's a good way for netvsc as well?

Thanks