netdev - Re: [PATCH net-next v2 00/12] Multiqueue + DSA untag support + fixes for mtk_eth

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Date:   Thu, 10 Nov 2022 20:03:40 +0100
From:   Felix Fietkau <nbd@....name>
To:     "Russell King (Oracle)" <linux@...linux.org.uk>
Cc:     netdev@...r.kernel.org, Matthias Brugger <matthias.bgg@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH net-next v2 00/12] Multiqueue + DSA untag support + fixes
 for mtk_eth_soc

Hi Russell,

On 10.11.22 19:50, Russell King (Oracle) wrote:
> Hi Felix,
> 
> Not directly related to your patch series, but as you seem to be
> tinkering with the driver, it seems appropriate to ask. Are you
> using hardware that uses RGMII? If not, do you know anyone who is?
> 
> It would be good to fix mtk_mac_config(), specifically the use
> of state->speed therein - see the FIXME that I placed in that
> function. Honestly, I think this code is broken, since if the
> RGMII interface speed changes, the outer if() won't allow this
> code path to be re-executed (since mac->interface will be the
> same as state->interface for speed changes.)
The only device I'm aware of which uses RGMII has the RGMII port 
connected to a switch with no proper upstream driver support - no speed 
changes expected there.

- Felix