netdev - Re: Under what conditions is phy_device "adjust

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Message-ID: <20180816233345.GA12941@lunn.ch>
Date:   Fri, 17 Aug 2018 01:33:45 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     rpjday@...shcourse.ca, netdev@...r.kernel.org
Subject: Re: Under what conditions is phy_device "adjust_link()" called?

On Thu, Aug 16, 2018 at 11:59:19AM -0700, Florian Fainelli wrote:
> On 08/16/2018 10:26 AM, rpjday@...shcourse.ca wrote:
> > 
> > I can see from the documentation that the callback adjust_link() is invoked
> > "for the enet controller to respond to changes in the link state." Is there
> > a specific list of the events that would generate such a change? Are we
> > talking initially opening the device, ifup/ifdown, physically unplugging
> > from the port, some or all of the above?
> 
> adjust_link() is typically called on transitions from link UP to DOWN
> and DOWN to UP. This may include the initial configuration of the PHY
> during e.g: phy_connect() and then typically when an event occurs than
> requires a re-configuration of the MAC: link parameters (speed, status,
> duplex, pause) changed.

Just adding to that, if you have a 10G PHY, the MAC-PHY interface mode
can also change, e.g. SGMII for 10/100/1000, and 10GBase-T for 10G,
etc.

	Andrew