netdev - Re: [PATCH 1/2 bpf v2] xdp: add XDP extension to skb

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Message-ID: <20251028155558.7c13b033@kernel.org>
Date: Tue, 28 Oct 2025 15:55:58 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Fernando Fernandez Mancera <fmancera@...e.de>
Cc: bpf@...r.kernel.org, netdev@...r.kernel.org, magnus.karlsson@...el.com,
 maciej.fijalkowski@...el.com, sdf@...ichev.me, kerneljasonxing@...il.com,
 fw@...len.de
Subject: Re: [PATCH 1/2 bpf v2] xdp: add XDP extension to skb

On Tue, 28 Oct 2025 19:30:31 +0100 Fernando Fernandez Mancera wrote:
> This patch adds a new skb extension for XDP representing the number of
> cq descriptors and a linked list of umem addresses.
> 
> This is going to be used from the xsk skb destructor to put the umem
> addresses onto pool's completion queue.

This increases the size of skb extensions and burns a bit in every skb.
Unacceptable for a fallback / slowpath.