netdev - Re: [PATCH net 00/12] net: iflink and link-netnsid fixes

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Message-ID: <20201001142538.03f28397@hermes.local>
Date:   Thu, 1 Oct 2020 14:25:38 -0700
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     Sabrina Dubroca <sd@...asysnail.net>
Cc:     netdev@...r.kernel.org,
        Nicolas Dichtel <nicolas.dichtel@...nd.com>,
        Marek Lindner <mareklindner@...mailbox.ch>,
        Simon Wunderlich <sw@...onwunderlich.de>,
        Antonio Quartulli <a@...table.cc>,
        Sven Eckelmann <sven@...fation.org>,
        b.a.t.m.a.n@...ts.open-mesh.org, Roopa Prabhu <roopa@...dia.com>,
        Nikolay Aleksandrov <nikolay@...dia.com>
Subject: Re: [PATCH net 00/12] net: iflink and link-netnsid fixes

On Thu,  1 Oct 2020 09:59:24 +0200
Sabrina Dubroca <sd@...asysnail.net> wrote:

> In a lot of places, we use this kind of comparison to detect if a
> device has a lower link:
> 
>   dev->ifindex != dev_get_iflink(dev)


Since this is a common operation, it would be good to add a new
helper function in netdevice.h

In your patch set, you are copying the same code snippet which
seems to indicate that it should be a helper.

Something like:

static inline bool netdev_has_link(const struct net_device *dev)
{
	const struct net_device_ops *ops = dev->netdev_ops;

	return ops && ops->ndo_get_iflink;
}