linux-kernel - Re: [PATCH net-next v1 1/1] usbnet: add devlink support

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Date:   Thu, 27 Jan 2022 08:56:27 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Oleksij Rempel <o.rempel@...gutronix.de>
Cc:     Andrew Lunn <andrew@...n.ch>, Oliver Neukum <oneukum@...e.com>,
        "David S. Miller" <davem@...emloft.net>, kernel@...gutronix.de,
        linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
        netdev@...r.kernel.org
Subject: Re: [PATCH net-next v1 1/1] usbnet: add devlink support

On Thu, 27 Jan 2022 16:43:53 +0100 Andrew Lunn wrote:
> On Thu, Jan 27, 2022 at 12:07:42PM +0100, Oleksij Rempel wrote:
> > The weakest link of usbnet devices is the USB cable. Currently there is
> > no way to automatically detect cable related issues except of analyzing
> > kernel log, which would differ depending on the USB host controller.
> > 
> > The Ethernet packet counter could potentially show evidence of some USB
> > related issues, but can be Ethernet related problem as well.  
> 
> I don't know the usbnet drivers very well. A quick look suggests they
> don't support statistics via ethtool -S. So you could make use of that
> to return statistics about USB error events.

On using devlink health - it is great when you want to attach some extra
info to the error report. If you're just counting different types of
errors seems like an overkill.

> However, GregKH point still stands, maybe such statistics should be
> made for all USB devices, and be available in /sys/bus/usb/devices/*