linux-kernel - RE: [PATCH net-next 0/3] net: stmmac: Convert to phylink

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Message-ID: <BN8PR12MB3266BEC39374BE3E9CD2647DD3C40@BN8PR12MB3266.namprd12.prod.outlook.com>
Date:   Mon, 22 Jul 2019 14:26:45 +0000
From:   Jose Abreu <Jose.Abreu@...opsys.com>
To:     Andrew Lunn <andrew@...n.ch>, Jose Abreu <Jose.Abreu@...opsys.com>
CC:     Ondřej Jirman <megi@....cz>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Joao Pinto <Joao.Pinto@...opsys.com>,
        "David S . Miller" <davem@...emloft.net>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Russell King <linux@...linux.org.uk>,
        "Florian Fainelli" <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>
Subject: RE: [PATCH net-next 0/3] net: stmmac: Convert to phylink

From: Andrew Lunn <andrew@...n.ch>
Date: Jul/22/2019, 15:19:43 (UTC+00:00)

> On Mon, Jul 22, 2019 at 01:58:20PM +0000, Jose Abreu wrote:
> > From: Andrew Lunn <andrew@...n.ch>
> > Date: Jul/22/2019, 14:40:23 (UTC+00:00)
> > 
> > > Does this mean that all stmmac variants support 1G? There are none
> > > which just support Fast Ethernet?
> > 
> > This glue logic drivers sometimes reflect a custom IP that's Synopsys 
> > based but modified by customer, so I can't know before-hand what's the 
> > supported max speed. There are some old versions that don't support 1G 
> > but I expect that PHY driver limits this ...
> 
> If a Fast PHY is used, then yes, it would be limited. But sometimes a
> 1G PHY is used because they are cheaper than a Fast PHY.
>  
> > > I'm also not sure the change fits the problem. Why did it not
> > > negotiate 100FULL rather than 10Half? You are only moving the 1G
> > > speeds around, so 100 speeds should of been advertised and selected.
> > 
> > Hmm, now that I'm looking at it closer I agree with you. Maybe link 
> > partner or PHY doesn't support 100M ?
> 
> In the working case, ethtool shows the link partner supports 10, 100,
> and 1G. So something odd is going on here.
> 
> You fix does seems reasonable, and it has been reported to fix the
> issue, but it would be good to understand what is going on here.

Agreed!

Ondrej, can you please share dmesg log and ethtool output with the fixed 
patch ?

---
Thanks,
Jose Miguel Abreu