netdev - Re: Is advertising of 2500Mbps support must from phy device to set phy at 2500Mbps link speed

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Message-ID: <6cbbb9cb-119e-eb7d-e230-6bf496300eb4@gmail.com>
Date:   Fri, 8 Feb 2019 16:07:10 +0530
From:   abhijit <abhijitnaik27@...il.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     netdev@...r.kernel.org
Subject: Re: Is advertising of 2500Mbps support must from phy device to set
 phy at 2500Mbps link speed

Thanks Andrew for your reply. I will have look at IEEE document and c45.


On Wednesday 06 February 2019 07:08 PM, Andrew Lunn wrote:
>> Currently, we don't have any phy drivers. Generic driver doesn't seems to
>> support 2500Mbps.
> Correct. genphy only supports upto 1G. The c45 based genphy_c45 is
> slowly gaining more features and might soon support 2.5G.
>
>> If I have to write the driver, whether it is necessary for
>> phy device to advertise speed of 2500Mbps?
> The user could force it, using the ethool command you suggested. But
> it is the PHY driver which configures this. If you add the driver code
> to force it, you might as well add the driver code to allow it to be
> negotiated.
>
>> Phy is custom phy and is currently under test. If you know any phy device
>> that supports 2500Mbps and whose data sheet is available freely please let
>> me know.
> There are none that i know of with open data sheets. However the IEEE
> standards should be freely available and they describe the registers
> the PHY is expected to have. There are also patches floating around
> which add 2.5G and 5G support to the marvell10g driver. I expect these
> patches to get merged soon, but maybe in a different form to make
> genphy_c45 more generic.
>
> 	   Andrew