[ofa-general] Re: [PATCH/RFC] IB/mlx4: Handle new FW requirement for send request prefetching

[Jack Morgenstein]

On Wednesday 13 June 2007 20:29, Roland Dreier wrote:
> I just queued this patch to handle new FW up.  Please let me know if
> it looks OK to you, and I will ask Linus to pull it.
> 
> Thanks.
> 

Looks good!

- Jack

> commit f22332295cb218ad12db2b521a34553ff5790c34
> Author: Roland Dreier <rolandd at cisco.com>
> Date:   Wed Jun 13 10:26:43 2007 -0700
> 
>     IB/mlx4: Handle new FW requirement for send request prefetching
>     
>     New ConnectX firmware introduces FW command interface revision 2,
>     which requires that for each QP, a chunk of send queue entries (the
>     "headroom") is kept marked as invalid, so that the HCA doesn't get
>     confused if it prefetches entries that haven't been posted yet.  Add
>     code to the driver to do this, and also update the user ABI so that
>     userspace can request that the prefetcher be turned off for userspace
>     QPs (we just leave the prefetcher on for all kernel QPs).
>     
>     Marking send queue entries this way is OK for older firmware too, so
>     we change the driver to allow FW command interface revisions 1 and 2.
>     
>     Based on a patch from Jack Morgenstein <jackm at dev.mellanox.co.il>.
>     
>     Signed-off-by: Roland Dreier <rolandd at cisco.com>
> 
>