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From: John Baldwin <jhb@freebsd.org>
To: freebsd-net@freebsd.org
Subject: Re: How to switch Datgram/Connected mtu modes?
Date: Wed, 29 May 2013 13:33:52 -0400
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 (bigwig.baldwin.cx); Wed, 29 May 2013 14:16:48 -0400 (EDT)
Cc: Alex Liptsin <alexl@mellanox.com>,
 "freebsd-questions@freebsd.org" <freebsd-questions@freebsd.org>
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On Sunday, May 26, 2013 7:43:29 am Alex Liptsin wrote:
> Hello.
> 
> I work with FreeBSD 9.1 and Mellanox devices.
> 
> How can I configure MTU in connected mode on FreeBSD 9.1?
> In Linux to enable connected mode for interface ib0, I enter:
> 
>    echo connected > /sys/class/net/ib0/mode
> 
> 
> 
> Switching between CM and UD mode can be done in run time:
> 
>    echo datagram > /sys/class/net/ib0/mode sets the mode of ib0 to UD
> 
>    echo connected > /sys/class/net/ib0/mode sets the mode ib0 to CM
> 
> There is no such directories at FreeBSD. Wat shall I do?

Have you tried looking for dev.ib.0 sysctls?  It looks like the OFED bits in 
FreeBSD map Linux sysfs entries to sysctl nodes, but I don't have a box with 
IB handy to see what it looks like at runtime.

-- 
John Baldwin