netdev - Re: [PATCH v8 net-next 0/4] add multi-buff support for xdp running in generic mode

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Date: Fri, 9 Feb 2024 22:47:19 +0100
From: Lorenzo Bianconi <lorenzo@...nel.org>
To: Jakub Kicinski <kuba@...nel.org>
Cc: netdev@...r.kernel.org, lorenzo.bianconi@...hat.com,
	davem@...emloft.net, edumazet@...gle.com, pabeni@...hat.com,
	bpf@...r.kernel.org, toke@...hat.com,
	willemdebruijn.kernel@...il.com, jasowang@...hat.com,
	sdf@...gle.com, hawk@...nel.org, ilias.apalodimas@...aro.org,
	linyunsheng@...wei.com
Subject: Re: [PATCH v8 net-next 0/4] add multi-buff support for xdp running
 in generic mode

> On Mon,  5 Feb 2024 12:35:11 +0100 Lorenzo Bianconi wrote:
> > Introduce multi-buffer support for xdp running in generic mode not always
> > linearizing the skb in netif_receive_generic_xdp routine.
> > Introduce generic percpu page_pools allocator.
> 
> breaks the veth test, apparently:
> 
> https://netdev-3.bots.linux.dev/vmksft-net/results/458181/60-veth-sh/stdout
> 
> could be that the test needs fixing not the code.
> But either way we need a respin :(
> -- 
> pw-bot: cr

Hi Jakub,

Ack, thx for reporting the problem. The issue is we should use skb_pp_cow_data()
instead of skb_cow_data_for_xdp() in veth_convert_skb_to_xdp_buff() since we do
not have any requirement for the attached bpf_prog there. I will fix it in v9.

Regards,
Lorenzo

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