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

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Message-ID: <ZqtEI4k2KBzz_-cr@lore-desk>
Date: Thu, 1 Aug 2024 10:15:31 +0200
From: Lorenzo Bianconi <lorenzo@...nel.org>
To: Elad Yifee <eladwf@...il.com>
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.

ack, but in this case, please provide even the HW-LRO support in the same
series. Moreover, I am not sure if it is performant enough or not, we could
increase the page_pool order.
Moreover I guess we should be sure the HW-LRO works on all NETSYS2/3 hws
revisions.

Regards,
Lorenzo

> 
> > > 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.

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