netdev - Re: query on dynamic switching between Ethernet ports

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Date:	Fri, 9 Nov 2012 15:36:43 +0000
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Rayagond K <rayagond@...avyalabs.com>
CC:	<netdev@...r.kernel.org>
Subject: Re: query on dynamic switching between Ethernet ports

On Fri, 2012-11-09 at 20:02 +0530, Rayagond K wrote:
> Hi All,
> 
> I am implementing handling of dynamic switching between Ethernet ports
> (1GMbps to 100Mbps mode) using PHY layer, I referred various driver in
> LXR and doc and I am able to understand the PHY layer and implement in
> my driver.
> 
> For now I am able to do following in my driver now,
> 
> 1. Advertising all the capabilities like FULL duplex, half duplex,
> pause frames, MII/GMII etc while registering with PHY layer.
> 2. Able to detect the link up and link down.
> 3. Able do the auto-negotiation with remote end link partner and
> program my MAC accordingly.
> 4. Able to establish the link by connecting and disconnecting the
> cable many times.
> 
> But I am facing one problem ie my driver is not able to establish the
> link when I load the driver first time and connected to 1G port. If I
> toggle the port connection between MII(10/100Mbps) and GMII(1Gbps) for
> two/three times and connect it back to GMII ports then driver works
> fine and it establish the link.

Is the driver resetting everything it needs to when loaded?

Ben.

-- 
Ben Hutchings, Staff Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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