Re: [Ocf-linux-users] OCF inbuilt and 2.6.27

[David M. <Dav...@se...>]

Jivin Daniel Mueller lays it down ...
> On Tue, 17 Mar 2009 10:38:47 +1000 David McCullough wrote:
> 
> > [.. snip ..]
> > Use the talitos driver as an example.  From what I have seen it should
> > be fairly easy to follow.
> 
> Thanks for all this information. I'll have a look at it. 
> 
> BTW: the ubsec_ssb OCF driver is now part of OpenWRT [1]. I got


Did you want to send in a copy to include in ocf-linux  ?

> positive feedback from a few people. The only application(s) that can
> be accelerated at the moment is libopenssl with OpenSSH. 
> 
> I am still having problems with OpenSWAN. Unfortunately packets that
> need to be forwarded from one network (e.g. LAN1) to another network
> (e.g. Wifi) are not 32bit memory aligned. So in-place
> encryption/decryption does not work here (HW requires 32bit aligned
> memory for its output data buffer). I couldn't figure out why this
> happens - maybe it's the network(-switch) driver, that uses VLAN tags.
> If I were allowed to use a different (aligned) memory address for the
> output data I could extend the driver to work like this.

You could add a local buffer to each session in your driver,  and,  if
the request was unaligned, output to it and copy back when done.

On these slow CPU's a memcpy of a 1000 bytes is still much faster than
the crypto op.  That would at least get you working transparently and
allow you to use it for openswan ;-)

Cheers,
Davidm

-- 
David McCullough,  dav...@se...,  Ph:+61 734352815
McAfee - SnapGear  http://www.snapgear.com                http://www.uCdot.org