netdev - Re: [net PATCH] skb: Do mix page pool and page referenced frags in GRO

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Date:   Fri, 27 Jan 2023 21:26:46 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Yunsheng Lin <linyunsheng@...wei.com>
Cc:     Alexander Duyck <alexander.duyck@...il.com>, <nbd@....name>,
        <davem@...emloft.net>, <edumazet@...gle.com>, <hawk@...nel.org>,
        <ilias.apalodimas@...aro.org>, <linux-kernel@...r.kernel.org>,
        <lorenzo@...nel.org>, <netdev@...r.kernel.org>, <pabeni@...hat.com>
Subject: Re: [net PATCH] skb: Do mix page pool and page referenced frags in
 GRO

On Sat, 28 Jan 2023 10:37:47 +0800 Yunsheng Lin wrote:
> If we are not allowing gro for the above case, setting NAPI_GRO_CB(p)->flush
> to 1 in gro_list_prepare() seems to be making more sense so that the above
> case has the same handling as skb_has_frag_list() handling?
> https://elixir.bootlin.com/linux/v6.2-rc4/source/net/core/gro.c#L503
> 
> As it seems to avoid some unnecessary operation according to comment
> in tcp4_gro_receive():
> https://elixir.bootlin.com/linux/v6.2-rc4/source/net/ipv4/tcp_offload.c#L322

The frag_list case can be determined with just the input skb.
For pp_recycle we need to compare input skb's pp_recycle with
the pp_recycle of the skb already held by GRO.

I'll hold off with applying a bit longer tho, in case Eric
wants to chime in with an ack or opinion.