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

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Message-ID: <CAMuHMdXH4A96CUuSkmnL8RVubRyd9eswz9VPqBsDqXGbNCWncw@mail.gmail.com>
Date:   Tue, 21 May 2019 15:07:08 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Heiner Kallweit <hkallweit1@...il.com>
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

Hi Heiner,

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?

Thanks!

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds