From: David Miller <davem@davemloft.net>
To: dhowells@redhat.com
Cc: hannes@stressinduktion.org, netdev@vger.kernel.org
Subject: Re: Getting a NIC's MTU size
Date: Thu, 20 Feb 2014 13:45:04 -0500 (EST) [thread overview]
Message-ID: <20140220.134504.889753387361360927.davem@davemloft.net> (raw)
In-Reply-To: <16869.1392917423@warthog.procyon.org.uk>
From: David Howells <dhowells@redhat.com>
Date: Thu, 20 Feb 2014 17:30:23 +0000
> David Miller <davem@davemloft.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?
If the dst is valid and you have a reference to it, dst->dev is good.
prev parent reply other threads:[~2014-02-20 18:45 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-02-14 14:36 Does ICMP_FRAG_NEEDED automatically update the routing cache? David Howells
2014-02-14 14:44 ` Hannes Frederic Sowa
2014-02-14 15:00 ` David Howells
2014-02-14 15:03 ` Hannes Frederic Sowa
2014-02-14 15:42 ` David Howells
2014-02-14 15:49 ` Getting a NIC's MTU size David Howells
2014-02-14 16:52 ` Hannes Frederic Sowa
2014-02-17 5:21 ` David Miller
2014-02-20 17:30 ` David Howells
2014-02-20 18:12 ` Hannes Frederic Sowa
2014-02-20 18:45 ` David Miller [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20140220.134504.889753387361360927.davem@davemloft.net \
--to=davem@davemloft.net \
--cc=dhowells@redhat.com \
--cc=hannes@stressinduktion.org \
--cc=netdev@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).