netdev - Re: [PATCH] net: phy: phy_ethtool_ksettings

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Message-ID: <d47cd2a9-441a-47ea-b509-f00657dc5495@cogentembedded.com>
Date: Tue, 3 Dec 2024 19:02:38 +0500
From: Nikita Yushchenko <nikita.yoush@...entembedded.com>
To: "Russell King (Oracle)" <linux@...linux.org.uk>
Cc: Andrew Lunn <andrew@...n.ch>, Heiner Kallweit <hkallweit1@...il.com>,
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
 netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
 Michael Dege <michael.dege@...esas.com>,
 Christian Mardmoeller <christian.mardmoeller@...esas.com>,
 Dennis Ostermann <dennis.ostermann@...esas.com>
Subject: Re: [PATCH] net: phy: phy_ethtool_ksettings_set: Allow any supported
 speed

> Does IEEE 802.3 allow auto-negotiation to be turned off for speeds
> greater than 1Gbps?

Per 802.3-2022 ch, autoneg is optional:

| 125.2.4.3 Auto-Negotiation, type single differential-pair media
|
| Auto-Negotiation (Clause 98) may be used by 2.5GBASE-T1 and
| 5GBASE-T1 devices to detect the abilities (modes of operation)
| supported by the device at the other end of a link segment,
| determine common abilities, and configure for joint operation.
| Auto-Negotiation is performed upon link startup through the use
| of half-duplex differential Manchester encoding.
|
| The use of Clause 98 Auto-Negotiation is optional for 2.5GBASE-T1
| and 5GBASE-T1 PHYs.