netdev - Re: [ethtool PATCH v4 00/11] add support for new ETHTOOL

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Date:	Mon, 14 Mar 2016 00:27:43 +0000
From:	Ben Hutchings <ben@...adent.org.uk>
To:	David Decotigny <ddecotig@...il.com>, netdev@...r.kernel.org
Cc:	Jeff Garzik <jgarzik@...ox.com>, David Miller <davem@...hat.com>,
	Vidya Sagar Ravipati <vidya@...ulusnetworks.com>,
	Joe Perches <joe@...ches.com>,
	David Decotigny <decot@...glers.com>
Subject: Re: [ethtool PATCH v4 00/11] add support for new
 ETHTOOL_xLINKSETTINGS ioctls

On Sun, 2016-03-13 at 17:30 +0000, Ben Hutchings wrote:
[...]
> Patch 11: you need to answer my question about this.

[This is about why/whether there should be a fallback from creating an
AF_INET socket to issue SIOCETHTOOL on.]

I looked a little further, and found:
- The only address/protocol family that is always present in the kernel
  (assuming CONFIG_NET=y) is netlink
- Netlink sockets don't support ioctl at all

So there seems to be no right answer to 'which family of socket should
I create to perform device ioctls'.  There really ought to be!

Ben.

-- 
Ben Hutchings
If at first you don't succeed, you're doing about average.

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