Re: [Qemu-devel] [PATCH v2 09/22] hw/pvrdma: Set the correct opcode for send completion

[Yuval Shaia]

On Sat, Nov 10, 2018 at 08:21:51PM +0200, Marcel Apfelbaum wrote:
> 
> 
> On 11/8/18 6:08 PM, Yuval Shaia wrote:
> > opcode for WC should be set by the device and not taken from work
> > element.
> > 
> > Signed-off-by: Yuval Shaia <address@hidden>
> > ---
> >   hw/rdma/vmw/pvrdma_qp_ops.c | 2 +-
> >   1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/hw/rdma/vmw/pvrdma_qp_ops.c b/hw/rdma/vmw/pvrdma_qp_ops.c
> > index 7b0f440fda..3388be1926 100644
> > --- a/hw/rdma/vmw/pvrdma_qp_ops.c
> > +++ b/hw/rdma/vmw/pvrdma_qp_ops.c
> > @@ -154,7 +154,7 @@ int pvrdma_qp_send(PVRDMADev *dev, uint32_t qp_handle)
> >           comp_ctx->cq_handle = qp->send_cq_handle;
> >           comp_ctx->cqe.wr_id = wqe->hdr.wr_id;
> >           comp_ctx->cqe.qp = qp_handle;
> > -        comp_ctx->cqe.opcode = wqe->hdr.opcode;
> > +        comp_ctx->cqe.opcode = IBV_WC_SEND;
> 
> That is interesting, what should happen if the opcode in hdr is different?
> Maybe fail the operation?

openmpi builds its entire IB state machine on that, see here:

https://github.com/open-mpi/ompi/blob/3dc1629771177a883cd8f1be6e97ab152e0f4584/opal/mca/btl/openib/btl_openib_component.c#L3512

> 
> Thanks,
> Marcel
> 
> >           rdma_backend_post_send(&dev->backend_dev, &qp->backend_qp, 
> > qp->qp_type,
> >                                  (struct ibv_sge *)&wqe->sge[0], 
> > wqe->hdr.num_sge,
>