netdev - Re: [PATCH net-next v2 00/10] net: dsa: add generic debugfs interface

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Message-ID: <20170829062931.GB1977@nanopsycho.orion>
Date:   Tue, 29 Aug 2017 08:29:31 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     David Miller <davem@...emloft.net>
Cc:     vivien.didelot@...oirfairelinux.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel@...oirfairelinux.com,
        f.fainelli@...il.com, andrew@...n.ch, privat@...l-hjelmeland.no,
        john@...ozen.org, Woojung.Huh@...rochip.com,
        sean.wang@...iatek.com, nikita.yoush@...entembedded.com,
        cphealy@...il.com
Subject: Re: [PATCH net-next v2 00/10] net: dsa: add generic debugfs interface

Tue, Aug 29, 2017 at 06:38:37AM CEST, davem@...emloft.net wrote:
>From: Vivien Didelot <vivien.didelot@...oirfairelinux.com>
>Date: Mon, 28 Aug 2017 15:17:38 -0400
>
>> This patch series adds a generic debugfs interface for the DSA
>> framework, so that all switch devices benefit from it, e.g. Marvell,
>> Broadcom, Microchip or any other DSA driver.
>
>I've been thinking this over and I agree with the feedback given that
>debugfs really isn't appropriate for this.
>
>Please create a DSA device class, and hang these values under
>appropriate sysfs device nodes that can be easily found via
>/sys/class/dsa/ just as easily as they would be /sys/kernel/debug/dsa/
>
>You really intend these values to be consistent across DSA devices,
>and you don't intend to go willy-nilly changig these exported values
>arbitrarily over time.  That's what debugfs is for, throw-away
>stuff.
>
>So please make these proper device sysfs attributes rather than
>debugfs.

As I wrote, I believe that there is a big overlap with devlink and its
dpipe subset. I think that primary we should focus on extending whatever
is needed for dsa there. The iface should be generic for all drivers,
not only dsa. dsa-specific sysfs attributes should be last-resort solution,
I believe we can avoid them.