query on dynamic switching between Ethernet ports

query on dynamic switching between Ethernet ports

[Rayagond K]

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.

-- 
wwr
Rayagond

Re: query on dynamic switching between Ethernet ports

[Ben Hutchings]

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.

Re: query on dynamic switching between Ethernet ports

[Rayagond K]

yes driver issues soft reset to MAC and PHY.

On Fri, Nov 9, 2012 at 9:06 PM, Ben Hutchings <bhutchings@solarflare.com> wrote:
> 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.
>



-- 
wwr
Rayagond