netdev - Re: [PATCH RFC 0/5] net: L2 only interfaces

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Message-ID: <20150825232021.GA8482@Alexeis-MacBook-Pro-2.local>
Date:	Tue, 25 Aug 2015 16:20:25 -0700
From:	Alexei Starovoitov <alexei.starovoitov@...il.com>
To:	Florian Fainelli <f.fainelli@...il.com>
Cc:	netdev@...r.kernel.org, davem@...emloft.net, andrew@...n.ch,
	linux@...ck-us.net, jiri@...nulli.us, sfeldma@...il.com
Subject: Re: [PATCH RFC 0/5] net: L2 only interfaces

On Tue, Aug 25, 2015 at 03:50:10PM -0700, Florian Fainelli wrote:
> Hi all,
> 
> This patch series implements a L2 only interface concept which basically denies
> any kind of IP address configuration on these interfaces, but still allows them
> to be used as configuration end-points to keep using ethtool and friends.
> 
> A cleaner approach might be to finally come up with the concept of net_port
> which a net_device would be a superset of, but this still raises tons of
> questions as to whether we should be modifying userland tools to be able to
> configure/query these interfaces. During all the switch talks/discussions last
> year, it seemed to me like th L2-only interface is closest we have to a
> "network port".
> 
> Comments, flames, flying tomatoes welcome!
> 
> Florian Fainelli (5):
>   net: add IFF_L2_ONLY flag
>   net: ipv4: Skip in_dev initialization for IFF_L2_ONLY interfaces
>   net: ipv6: Skip in6_dev initialization for IFF_L2_ONLY interfaces

interesting idea! Do you know how kernel/iproute2 will react to lack of in_dev?
No crashes I'm assuming, but what kind of errors are thrown?
imo great first step to have lightweight netdevs. +1 for 'net_port' in the future.

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