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Date:   Tue, 5 Feb 2019 15:56:01 +0100
From:   Andrew Lunn <>
To:     abhijit <>
Subject: Re: Is advertising of 2500Mbps support must from phy device to set
 phy at 2500Mbps link speed

On Tue, Feb 05, 2019 at 11:39:34AM +0530, abhijit wrote:
> Hi All,
> We are using Ethernet MAC which has integrated Phy. This phy supports speed
> up to 10000Mbps. The phy has, 1000Base-X PCS(Physical Coding Sub-layer)
> followed by SerDes interface to support 10Mbps to 10000Mbps. Currently we
> are trying to get this phy at 2500Mbps. This device has 16 registers that
> corresponds to Clause 37, which can be used to advertise speed till
> 1000Mbps.
> So my question is,
> 1. Without phy advertising its capability of 2500Mbps, is there any way I
> can set phy speed at 2500Mbps?
> 2. I tried disabling auto-negotiation and setting speed at 2500Mbps with
> ethtool (ethtool -s eth0  speed 2500 autoneg off), but the ethtool reported
> this configuration as invalid?
> 3. At the end we are targeting print of "link up (2500/Full)"

Hi Abhijit

It all depends on what the PHY driver can do. It sounds like the PHY
driver does not support multi-gige speeds. So you probably need to
work on the PHY driver and add support for them.

What PHY is it?


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