linux-kernel - Re: [PATCH net-next v2 5/7] net: dsa: mt7530: simplify mt7530_setup

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Date: Fri, 2 Feb 2024 01:57:04 +0200
From: Vladimir Oltean <olteanv@...il.com>
To: Arınç ÜNAL <arinc.unal@...nc9.com>
Cc: Daniel Golle <daniel@...rotopia.org>, DENG Qingfang <dqfext@...il.com>,
	Sean Wang <sean.wang@...iatek.com>, Andrew Lunn <andrew@...n.ch>,
	Florian Fainelli <f.fainelli@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Matthias Brugger <matthias.bgg@...il.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	Russell King <linux@...linux.org.uk>, mithat.guner@...ont.com,
	erkin.bozoglu@...ont.com,
	Bartel Eerdekens <bartel.eerdekens@...stell8.be>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH net-next v2 5/7] net: dsa: mt7530: simplify
 mt7530_setup_port6() and change to void

On Tue, Jan 30, 2024 at 08:46:04PM +0300, Arınç ÜNAL wrote:
> would supposedly achieve 2 Gbps TX & 2 Gbps RX

Source? Commit 8efaa653a8a5 ("net: ethernet: mediatek: Add MT7621 TRGMII
mode support") says "TRGMII speed is 1200MBit.".

> Unless the MediaTek SoC ethernet driver somehow caps TRGMII to 1 Gbps,
> I consider this whole TRGMII shenanigans a scam

I laughed :)

You have to see whether the CPU isn't in fact at 100% already, becoming
a bottleneck before the interface speed does.

Also, mtk_eth_soc.c has an interesting comment "TRGMII is not permitted
on MT7621 if using DDR2" - not sure if applicable to your setup or not.

I just got myself an ASUS RT-AX1800U (uses the mt7621_asus_rt-ax53u.dts
device tree AFAICT) which I'll be setting up with OpenWrt in the weeks
to come, and on which I might also be able to run some tests from time
to time.