netdev - Re: [PATCH 2/5] xfrm: Pass UDP encapsulation in TX packet offload

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Date: Tue, 12 Mar 2024 07:20:06 +0100
From: Steffen Klassert <steffen.klassert@...unet.com>
To: Paolo Abeni <pabeni@...hat.com>
CC: David Miller <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>,
	Herbert Xu <herbert@...dor.apana.org.au>, <netdev@...r.kernel.org>
Subject: Re: [PATCH 2/5] xfrm: Pass UDP encapsulation in TX packet offload

On Mon, Mar 11, 2024 at 05:25:03PM +0100, Paolo Abeni wrote:
> Hi,
> 
> On Wed, 2024-03-06 at 11:04 +0100, Steffen Klassert wrote:
> > From: Leon Romanovsky <leonro@...dia.com>
> > 
> > In addition to citied commit in Fixes line, allow UDP encapsulation in
> > TX path too.
> > 
> > Fixes: 89edf40220be ("xfrm: Support UDP encapsulation in packet offload mode")
> > CC: Steffen Klassert <steffen.klassert@...unet.com>
> > Reported-by: Mike Yu <yumike@...gle.com>
> > Signed-off-by: Leon Romanovsky <leonro@...dia.com>
> > Signed-off-by: Saeed Mahameed <saeedm@...dia.com>
> > Signed-off-by: Steffen Klassert <steffen.klassert@...unet.com>
> 
> This is causing self-test failures:
> 
> https://netdev.bots.linux.dev/flakes.html?tn-needle=pmtu-sh
> 
> reverting this change locally resolves the issue.
> 
> @Leon, @Steffen: could you please have a look?

Looks like the check for x->encap was removed unconditionally.
I should just be removed when XFRM_DEV_OFFLOAD_PACKET is set,
otherwise we might create a GSO packet with UPD encapsulation.

Leon?