netdev - Re: [PATCH net-next] net: sfp: add debugfs support

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Date:   Tue, 24 Nov 2020 01:14:31 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Russell King <rmk+kernel@...linux.org.uk>
Cc:     Heiner Kallweit <hkallweit1@...il.com>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        Jakub Kicinski <kuba@...nel.org>
Subject: Re: [PATCH net-next] net: sfp: add debugfs support

On Mon, Nov 23, 2020 at 10:06:16PM +0000, Russell King wrote:
> Add debugfs support to SFP so that the internal state of the SFP state
> machines and hardware signal state can be viewed from userspace, rather
> than having to compile a debug kernel to view state state transitions
> in the kernel log.  The 'state' output looks like:
> 
> Module state: empty
> Module probe attempts: 0 0
> Device state: up
> Main state: down
> Fault recovery remaining retries: 5
> PHY probe remaining retries: 12
> moddef0: 0
> rx_los: 1
> tx_fault: 1
> tx_disable: 1
> 
> Signed-off-by: Russell King <rmk+kernel@...linux.org.uk>

Hi Russell

This looks useful. I always seem to end up recompiling the kernel,
which as you said, this should avoid.

Reviewed-by: Andrew Lunn <andrew@...n.ch>

    Andrew