netdev - What is the best way to provide FDB related metrics to user space?

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Message-ID: <20230324140622.GB28424@pengutronix.de>
Date:   Fri, 24 Mar 2023 15:06:22 +0100
From:   Oleksij Rempel <o.rempel@...gutronix.de>
To:     Vladimir Oltean <olteanv@...il.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Andrew Lunn <andrew@...n.ch>,
        Eric Dumazet <edumazet@...gle.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Woojung Huh <woojung.huh@...rochip.com>, kernel@...gutronix.de,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        UNGLinuxDriver@...rochip.com
Subject: What is the best way to provide FDB related metrics to user space?

Hello all,

I am currently working on implementing an interface to provide
FDB-related metrics to user space, such as the size of the FDB, the
count of objects, and so on. The IEEE 802.1Q-2018 standard offers some
guidance on this topic. For instance, section "17.2.4 Structure of the
IEEE8021-Q-BRIDGE-MIB" defines the ieee8021QBridgeFdbDynamicCount
object, and section "12.7.1.1.3 Outputs" provides additional outputs
that can be utilized for proper bridge management.

I've noticed that some DSA drivers implement devlink raw access to the
FDB. I am wondering if it would be acceptable to provide a generic
interface for all DSA switches for these kinds of metrics. What would be
the best interface to use for this purpose - devlink, sysfs, or
something else?

Best regards,
Oleskij
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