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

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Date:   Tue, 5 Feb 2019 11:39:34 +0530
From:   abhijit <abhijitnaik27@...il.com>
To:     netdev@...r.kernel.org
Subject: Is advertising of 2500Mbps support must from phy device to set phy at
 2500Mbps link speed

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)"

Regards,
   Abhijit