netdev - Re: status of rate adaptation

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Message-ID: <b37de72c-0b5d-7030-a411-6f150d86f2dd@seco.com>
Date:   Fri, 11 Nov 2022 15:57:23 -0500
From:   Sean Anderson <sean.anderson@...o.com>
To:     Tim Harvey <tharvey@...eworks.com>,
        netdev <netdev@...r.kernel.org>,
        Russell King <linux@...linux.org.uk>,
        "David S. Miller" <davem@...emloft.net>
Subject: Re: status of rate adaptation

Hi Tim,

On 11/11/22 15:44, Tim Harvey wrote:
> Greetings,
> 
> I've noticed some recent commits that appear to add rate adaptation support:
> 3c42563b3041 net: phy: aquantia: Add support for rate matching
> 7de26bf144f6 net: phy: aquantia: Add some additional phy interfaces
> b7e9294885b6 net: phylink: Adjust advertisement based on rate matching
> ae0e4bb2a0e0 net: phylink: Adjust link settings based on rate matching
> 0c3e10cb4423 net: phy: Add support for rate matching
> 
> I have a board with an AQR113C PHY over XFI that functions properly at
> 10Gbe links but still not at 1Gbe,2.5Gbe,5.0Gbe,100M with v6.1-rc4
> 
> Should I expect this to work now at those lower rates

Yes.

> and if so what kind of debug information or testing can I provide?

Please send

- Your test procedure (how do you select 1G?)
- Device tree node for the interface
- Output of ethtool (on both ends if possible).
- Kernel logs with debug enabled for drivers/phylink.c

That should be enough to get us started.

--Sean