netdev - Re: Getting a NIC's MTU size

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Message-ID: <16869.1392917423@warthog.procyon.org.uk>
Date:	Thu, 20 Feb 2014 17:30:23 +0000
From:	David Howells <dhowells@...hat.com>
To:	David Miller <davem@...emloft.net>
Cc:	dhowells@...hat.com, hannes@...essinduktion.org,
	netdev@...r.kernel.org
Subject: Re: Getting a NIC's MTU size

David Miller <davem@...emloft.net> wrote:

> > One further question: If I want to get the MTU size of the NIC through
> > which packets will go to get to a particular peer, can I do:
> 
> As has been suggested or at least hinted to by others, you have to use
> the route dst's device pointer.

So I gather.  My query was intended to be about the safety of accessing the
dst->dev pointer.  Can I just dereference it?  Or do I need to take a lock or
use RCU?

David
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