linux-kernel - Re: net: phy: improve pause mode reporting in phy_print

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Message-ID: <ca30d4db-628b-f70f-5849-1b1fcbc44ad9@gmail.com>
Date:   Tue, 21 May 2019 19:19:22 +0200
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Florian Fainelli <f.fainelli@...il.com>,
        Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
        Simon Horman <horms+renesas@...ge.net.au>,
        netdev <netdev@...r.kernel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: net: phy: improve pause mode reporting in phy_print_status

On 21.05.2019 15:07, Geert Uytterhoeven wrote:
> Hi Heiner,
> 
Hi Geert,

> On Wed, May 8, 2019 at 8:02 AM Linux Kernel Mailing List
> <linux-kernel@...r.kernel.org> wrote:
>> Commit:     23bfaa594002f4bba085e0a1ae3c9847b988d816
>> Parent:     5db9c74042e3c2168b1f1104d691063f5b662a8b
>> Refname:    refs/heads/master
>> Web:        https://git.kernel.org/torvalds/c/23bfaa594002f4bba085e0a1ae3c9847b988d816
>> Author:     Heiner Kallweit <hkallweit1@...il.com>
>> AuthorDate: Sun May 5 19:03:51 2019 +0200
>> Committer:  David S. Miller <davem@...emloft.net>
>> CommitDate: Tue May 7 12:40:39 2019 -0700
>>
>>     net: phy: improve pause mode reporting in phy_print_status
>>
>>     So far we report symmetric pause only, and we don't consider the local
>>     pause capabilities. Let's properly consider local and remote
>>     capabilities, and report also asymmetric pause.
>>
>>     Signed-off-by: Heiner Kallweit <hkallweit1@...il.com>
>>     Signed-off-by: David S. Miller <davem@...emloft.net>
> 
> Due to this commit, I see the folllowing change on Renesas development
> boards using either the sh_eth or ravb Ethernet driver:
> 
>     -sh-eth ee700000.ethernet eth0: Link is Up - 100Mbps/Full - flow
> control rx/tx
>     +sh-eth ee700000.ethernet eth0: Link is Up - 100Mbps/Full - flow control off
> 
> and
> 
>     -ravb e6800000.ethernet eth0: Link is Up - 1Gbps/Full - flow control rx/tx
>     +ravb e6800000.ethernet eth0: Link is Up - 1Gbps/Full - flow control off
> 
> Adding debug prints reveals that:
> 
>     phydev->autoneg = 1
>     phydev->pause = 1
>     phydev->asym_pause = 0 or 1 (depending on the board)
>     local_pause = 0
>     local_asym_pause = 0
> 
> Is this expected behavior?
> 
Yes. Both local pause parameters being 0 means no pause support is advertised.
Seems like both network drivers miss calls to phy_support_sym_pause or
phy_support_asym_pause respectively to indicate if and which pause modes
the MAC supports.
Before this patch only the remote pause capability was considered.

> Thanks!
> 
> Gr{oetje,eeting}s,
> 
>                         Geert
> 
Heiner