Re: [PATCH V1 for-next 1/2] IB/core: Report LSO capabilities when querying device

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On Mon, May 02, 2016 at 05:20:17PM +0000, Hefty, Sean wrote:
> > So, what do you think about stating an optional protocol in create_qp
> > and putting LSO in query_qp?
> 
> This makes sense to me, and I think will work well as devices become
> more complex (e.g. the qlogic NIC that supports both iWarp and
> RoCE).

What is the actual issue here?

LSO should just be programmable UD fragmentation. It should be
indistinguishable from a user app sending multiple send WRs to the UD
QP. Surely it doesn't have anything to do with the underlying wire
protocol?

That said, I haven't seen anything talking about how to program the
segmentation behavior (presumably it is assuming IP datagrams or
something?). It is absolutely necessary to specify the segmentation
method that the HW is going to use, there is lots of variety there.

Jason
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