From: Andrew Lunn <andrew@lunn.ch>
To: Baruch Siach <baruch@tkos.co.il>
Cc: netdev@vger.kernel.org, Heiner Kallweit <hkallweit1@gmail.com>,
Russell King <linux@armlinux.org.uk>
Subject: Re: Get MAC supported link modes for SFP port
Date: Thu, 26 Nov 2020 16:47:16 +0100 [thread overview]
Message-ID: <20201126154716.GN2073444@lunn.ch> (raw)
In-Reply-To: <87pn40uo25.fsf@tarshish>
On Thu, Nov 26, 2020 at 05:37:22PM +0200, Baruch Siach wrote:
> Hi netdev list,
>
> I am trying to retrieve all MAC supported link modes
> (ETHTOOL_LINK_MODE_*) for network interfaces with SFP port. The
> 'supported' bit mask that ETHTOOL_GLINKSETTINGS provides in
> link_mode_masks[] changes to match the SFP module that happens to be
> plugged in. When no SFP module is plugged, the bit mask looks
> meaningless.
That sounds like it is doing the correct thing.
> I understand that ETHTOOL_LINK_MODE_* bits are meant to describe PHY
> level capabilities. So I would settle for a MAC level "supported rates"
> list.
What is your use cases?
A MAC without some form a PHY, be it copper, fibre, or a faked
fixed-link, is useless. You need the combination of what the MAC can
do and what the PHY can do to have any meaning information.
Andrew
next prev parent reply other threads:[~2020-11-26 15:47 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-26 15:37 Get MAC supported link modes for SFP port Baruch Siach
2020-11-26 15:45 ` Russell King - ARM Linux admin
2020-11-26 15:47 ` Andrew Lunn [this message]
2020-11-26 16:01 ` Baruch Siach
2020-11-26 16:13 ` Russell King - ARM Linux admin
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