netdev - Re: [RFC PATCH 0/1] net: phy: skip autoneg of ethernet(fec) on network boot

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Date:   Tue, 10 Jul 2018 10:52:30 +0900 (JST)
From:   Masahiko KIMOTO <masahiko.kimoto@...ertrust.co.jp>
To:     andrew@...n.ch
Cc:     f.fainelli@...il.com, fugang.duan@....com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, hiraku.toyooka@...ertrust.co.jp
Subject: Re: [RFC PATCH 0/1] net: phy: skip autoneg of ethernet(fec) on
 network boot

  > >   > I completely acknowledge and support the use case, but your
  > >   > implementation is definitively not the way to go. In my experience the
  > >   > problem is usually that there may be a disagreement on the
  > >   > Pause/Asym_Pause advertisement bits and that alone is responsible for
  > >   > triggering a re-negotiation. Can yo check if that is the case here?
  > > 
  > > Thank you for your support.
  > > 
  > > Concening the problem about PAUSE/Asym_PAUSE advertisement you pointed out,
  > > I could not understand your consideration.
  > > 
  > > Would you tell me more detail about it?
  > 
  > Hi Masahiko
  > 
  > You said that the PHY is being configured 3 times, and might be doing
  > auto-neg three times. Often a phy will not actually perform auto-neg,
  > or do it much faster, if the advertised bits do not change with each
  > re-configuration.
  > 
  > So check how u-boot is configuring what is advertised, and look at
  > what Linux is configuring. In particularly, look at the pause
  > configuration. If pause is configured different in u-boot and Linux,
  > try to make it the same. Things might go faster than.

Thank you.

I'll try to check out u-boot side by mii command and Linux(server)
side by ethtool.

---------------------------------------------------------------------------
Masahiko KIMOTO,Ph.D. / Cybertrust Japan Co., Ltd. 
mail: masahiko.kimoto@...ertrust.co.jp
web: https://www.cybertrust.co.jp/ https://www.miraclelinux.com/