netdev - Re: [PATCH net-next 3/4] net: Call into DSA netdevice

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Message-ID: <20200719160441.GK1383417@lunn.ch>
Date:   Sun, 19 Jul 2020 18:04:41 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     Vladimir Oltean <olteanv@...il.com>, netdev@...r.kernel.org,
        Vivien Didelot <vivien.didelot@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Jiri Pirko <jiri@...lanox.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Taehee Yoo <ap420073@...il.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Maxim Mikityanskiy <maximmi@...lanox.com>,
        Richard Cochran <richardcochran@...il.com>,
        Michal Kubecek <mkubecek@...e.cz>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next 3/4] net: Call into DSA netdevice_ops wrappers

> If we have the core network stack reference DSA as a module then we
> force DSA to be either built-in or not, which is not very practical,
> people would still want a modular choice to be possible. The static
> inline only wraps indirect function pointer calls using definitions
> available at build time and actual function pointer substitution at run
> time, so we avoid that problem entirely that way.

Hi Florian

The jumping through the pointer avoids the inbuilt vs module problems.

The helpers themselves could be in a net/core/*.c file, rather than
static inline in a header. Is it worth adding a net/core/dsa.c for
code which must always be built in? At the moment, probably not.  But
if we have more such redirect, maybe it would be?

     Andrew