From: "Russell King (Oracle)" <linux@armlinux.org.uk>
To: Andrew Lunn <andrew@lunn.ch>
Cc: Bastien Curutchet <bastien.curutchet@bootlin.com>,
"David S. Miller" <davem@davemloft.net>,
Eric Dumazet <edumazet@google.com>,
Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
Rob Herring <robh+dt@kernel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
Conor Dooley <conor+dt@kernel.org>, Pavel Machek <pavel@ucw.cz>,
Lee Jones <lee@kernel.org>,
Richard Cochran <richardcochran@gmail.com>,
Heiner Kallweit <hkallweit1@gmail.com>,
linux-kernel@vger.kernel.org, netdev@vger.kernel.org,
devicetree@vger.kernel.org, linux-leds@vger.kernel.org,
Thomas Petazzoni <thomas.petazzoni@bootlin.com>,
herve.codina@bootlin.com, maxime.chevallier@bootlin.com,
christophercordahi@nanometrics.ca
Subject: Re: [PATCH v2 2/6] leds: trigger: Create a new LED netdev trigger for collision
Date: Tue, 27 Feb 2024 16:26:13 +0000 [thread overview]
Message-ID: <Zd4NJUcN3p/Vi2vn@shell.armlinux.org.uk> (raw)
In-Reply-To: <e6351d0c-15e2-47a9-be6c-6f21aee9ae90@lunn.ch>
On Tue, Feb 27, 2024 at 05:03:14PM +0100, Andrew Lunn wrote:
> On Tue, Feb 27, 2024 at 10:39:41AM +0100, Bastien Curutchet wrote:
> > Collisions on link does not fit into one of the existing netdev triggers.
> >
> > Add TRIGGER_NETDEV_COLLISION in the enum led_trigger_netdev_modes.
> > Add its definition in Documentation.
> > Add its handling in ledtrig-netdev, it can only be supported by hardware
> > so no software fallback is implemented.
>
> How useful is collision? How did you test this? How did you cause
> collisions to see if the LED actually worked?
>
> As far as i can see, this is just a normal 100Base-T PHY. Everybody
> uses that point-to-point nowadays.
That's largely irrelevant when it comes to collisions. If the link has
negotiated half-duplex mode (which we still support) then even on
twisted pair, there can be collisions, even though TX and RX are using
separate pairs. It's a quirk of 802.3 that this is the case.
--
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
FTTP is here! 80Mbps down 10Mbps up. Decent connectivity at last!
next prev parent reply other threads:[~2024-02-27 16:26 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-02-27 9:39 [PATCH v2 0/6] net: phy: Add TI's DP83640 device tree binding Bastien Curutchet
2024-02-27 9:39 ` [PATCH v2 1/6] dt-bindings: net: Add bindings for PHY DP83640 Bastien Curutchet
2024-02-28 11:37 ` Conor Dooley
2024-02-27 9:39 ` [PATCH v2 2/6] leds: trigger: Create a new LED netdev trigger for collision Bastien Curutchet
2024-02-27 16:03 ` Andrew Lunn
2024-02-27 16:26 ` Russell King (Oracle) [this message]
2024-02-29 7:24 ` Bastien Curutchet
2024-02-29 15:17 ` Andrew Lunn
2024-02-29 16:58 ` Russell King (Oracle)
2024-02-27 9:39 ` [PATCH v2 3/6] net: phy: DP83640: Add LED handling Bastien Curutchet
2024-02-27 9:58 ` Maxime Chevallier
2024-02-27 10:50 ` Russell King (Oracle)
2024-02-28 15:04 ` Andrew Lunn
2024-02-29 7:28 ` Bastien Curutchet
2024-02-27 9:39 ` [PATCH v2 4/6] net: phy: DP83640: Add EDPD management Bastien Curutchet
2024-02-27 10:02 ` Maxime Chevallier
2024-02-27 9:39 ` [PATCH v2 5/6] net: phy: DP83640: Explicitly disabling PHY Control Frames Bastien Curutchet
2024-02-27 10:08 ` Maxime Chevallier
2024-02-27 9:39 ` [PATCH v2 6/6] net: phy: DP83640: Add fiber mode enabling/disabling from device tree Bastien Curutchet
2024-02-27 11:01 ` Russell King (Oracle)
2024-02-27 16:18 ` Andrew Lunn
2024-02-29 7:31 ` Bastien Curutchet
2024-02-29 15:23 ` Andrew Lunn
2024-03-01 10:37 ` Maxime Chevallier
2024-03-01 14:00 ` Andrew Lunn
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