netdev - Re: [PATCH v3 net-next 2/2] xdp: add multi-buff support for xdp running in generic mode

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Date: Tue, 12 Dec 2023 09:36:31 +0100
From: Paolo Abeni <pabeni@...hat.com>
To: Jakub Kicinski <kuba@...nel.org>, Lorenzo Bianconi <lorenzo@...nel.org>
Cc: Jesper Dangaard Brouer <hawk@...nel.org>, aleksander.lobakin@...el.com, 
	netdev@...r.kernel.org, davem@...emloft.net, edumazet@...gle.com, 
	lorenzo.bianconi@...hat.com, bpf@...r.kernel.org, toke@...hat.com, 
	willemdebruijn.kernel@...il.com, jasowang@...hat.com, sdf@...gle.com
Subject: Re: [PATCH v3 net-next 2/2] xdp: add multi-buff support for xdp
 running in generic mode

On Mon, 2023-12-11 at 09:00 -0800, Jakub Kicinski wrote:
> On Sat, 9 Dec 2023 20:23:09 +0100 Lorenzo Bianconi wrote:
> > Are we going to use these page_pools just for virtual devices (e.g. veth) or
> > even for hw NICs? If we do not bound the page_pool to a netdevice I think we
> > can't rely on it to DMA map/unmap the buffer, right?
> 
> Right, I don't think it's particularly useful for HW NICs.
> Maybe for allocating skb heads? We could possibly kill
> struct page_frag_1k and use PP page / frag instead.
> But not sure how Eric would react :)

Side note here: we have a dedicated kmem_cache for typical skb head
allocation since commit bf9f1baa279f0758dc2297080360c5a616843927 -
where Eric mentioned we could possibly remove the page_frag_1k after
that (on my todo list since forever, sorry). 

Cheers,

Paolo
>