netdev - Re: [PATCH net] Bonding: update bond device XFRM features based on current active slave

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Message-ID: <1b507e18-24a4-4705-a987-53119009ce3f@redhat.com>
Date: Tue, 24 Sep 2024 15:17:25 +0200
From: Paolo Abeni <pabeni@...hat.com>
To: Hangbin Liu <liuhangbin@...il.com>, netdev@...r.kernel.org
Cc: Jay Vosburgh <jv@...sburgh.net>, Andy Gospodarek <andy@...yhouse.net>,
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Jakub Kicinski <kuba@...nel.org>, Jarod Wilson <jarod@...hat.com>,
 Nikolay Aleksandrov <razor@...ckwall.org>, Simon Horman <horms@...nel.org>,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH net] Bonding: update bond device XFRM features based on
 current active slave

On 9/18/24 10:35, Hangbin Liu wrote:
> XFRM offload is supported in active-backup mode. However, if the current
> active slave does not support it, we should disable it on bond device.
> Otherwise, ESP traffic may fail due to the downlink not supporting the
> feature.

Why would the excessive features exposed by the bond device will be a 
problem? later dev_queue_xmit() on the lower device should take care of 
needed xfrm offload in validate_xmit_xfrm(), no?

Let segmentation happening as late as possible is usually a win.

Cheers,

Paolo