netdev - Question regarding IP_TOS and SO

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Date:	Tue, 25 May 2010 21:19:32 +0000 (UTC)
From:	Holger Freyther <zecke@...fish.org>
To:	netdev@...r.kernel.org
Subject: Question regarding IP_TOS and SO_PRIORITY

Hi all,

I have a minor question regarding the IP_TOS and SO_PRIORITY socket
options. I was reading the man page for ip(7) and it pointed me to
socket(7) to look at the SO_PRIORITY. My man page claims that setting
the SO_PRIORITY will also set the tos on the outgoing IP header.

The problem is that I couldn't see the TOS set in my outgoing packets
and I was not able to find the code propagating the sk_priority into the
tos. On the other hand I could find that setting the IP_TOS will also
set the sk_priority.

Is this a documentation bug? Or did it work once? Or is it working and
my code was just broken and I'm too blind to find it?

z.

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