netdev - Re: [PATCH net-next v2 0/2] net: ethernet: mtk_eth

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Message-ID: <CA+SN3spwT1hrXQRmk8TkDOfBwp66WWqEAczvNCS7QaTe_eM=Vg@mail.gmail.com>
Date: Thu, 1 Aug 2024 11:01:43 +0300
From: Elad Yifee <eladwf@...il.com>
To: Lorenzo Bianconi <lorenzo@...nel.org>
Cc: Jakub Kicinski <kuba@...nel.org>, Felix Fietkau <nbd@....name>, Sean Wang <sean.wang@...iatek.com>, 
	Mark Lee <Mark-MC.Lee@...iatek.com>, "David S. Miller" <davem@...emloft.net>, 
	Eric Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>, 
	Matthias Brugger <matthias.bgg@...il.com>, 
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>, netdev@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
	linux-mediatek@...ts.infradead.org, Daniel Golle <daniel@...rotopia.org>, 
	Joe Damato <jdamato@...tly.com>
Subject: Re: [PATCH net-next v2 0/2] net: ethernet: mtk_eth_soc: improve RX performance

On Thu, Aug 1, 2024 at 10:30 AM Lorenzo Bianconi <lorenzo@...nel.org> wrote:
>
> nope, I added page_pool support even for non-XDP mode for hw that does
> not support HW-LRO. I guess mtk folks can correct me if I am wrong but
> IIRC there were some hw limirations on mt7986/mt7988 for HW-LRO, so I am
> not sure if it can be supported.
I know, but if we want to add support for HWLRO alongside XDP on NETSYS2/3,
we need to prevent the PP use (for HWLRO allocations) and enable it
only when there's
an XDP program.
I've been told HWLRO works on the MTK SDK version.

> > Other than that, for HWLRO we need contiguous pages of different order
> > than the PP, so the creation of PP
> > basically prevents the use of HWLRO.
> > So we solve this LRO problem and get a performance boost with this
> > simple change.
> >
> > Lorenzo's suggestion would probably improve the performance of the XDP
> > path and we should try that nonetheless.
>
> nope, I mean to improve peformances even for non-XDP case with page_pool frag
> APIs.
>
> Regards,
> Lorenzo
Yes of course it would improve it for non-XDP case if we still use PP
for non-XDP,
but my point is we shouldn't, mainly because of HWLRO, but also the
extra unnecessary code.