[openib-general] Re: RFC: ipath ioctls and their replacements
bos at pathscale.com
Thu Jan 19 13:52:05 PST 2006
On Thu, 2006-01-19 at 13:08 -0800, Sean Hefty wrote:
> I'm struggling to understand what your card does then. From this, it sounds
> like a standard network card that just happens to use IB physicals.
It has typical features of a standard network card, while also
supporting direct user access to the hardware. We eschew the
offload-as-much-as-possible approach that other vendors take.
> Do you just send raw packets?
We certainly can do that. The hardware doesn't need to do much more, in
> How is the LRH formatted by your card? I.e. what's setting
> up the dlid, slid, vl, etc.?
This is all done in software. The low-level driver and hardware fill
out enough of the IB UD protocol headers to put packets on the wire that
an IB switch will route. The higher-level layer is responsible for the
full IB protocol suite and the driver-side interfaces to the various
OpenIB userspace APIs.
> Can your card interoperate with other IB devices
> on the network when running in this mode?
Yes. It can do both the low-level wonkery and regular IB at the same
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