netdev - RE: [PATCH] net: introduce SO_BPF

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Message-ID: <AE90C24D6B3A694183C094C60CF0A2F6026B7466@saturn3.aculab.com>
Date:	Fri, 6 Dec 2013 09:50:49 -0000
From:	"David Laight" <David.Laight@...LAB.COM>
To:	"Eric Dumazet" <eric.dumazet@...il.com>,
	Michal Sekletár <sekletar.m@...il.com>
Cc:	"Daniel Borkmann" <dborkman@...hat.com>,
	"Michal Sekletar" <msekleta@...hat.com>, <netdev@...r.kernel.org>,
	"Michael Kerrisk" <mtk.manpages@...il.com>
Subject: RE: [PATCH] net: introduce SO_BPF_EXTENSIONS

> if SO_BPF_EXTENSIONS is supported, than you can assume that all current
> extensions are supported.
> 
> No need to consume one bit per feature, as all these features wont ever
> disappear from linux.

However one of the BSDs could add a subset of the features and
wish to advertise the fact.
So using extra flags for non-trivial extensions could be useful.

	David