[PATCH v2 2/2] IB/mlx5: set UMR wqe fence according to HCA cap

[leon@kernel.org (Leon Romanovsky)]

On Mon, May 29, 2017@03:21:11PM +0300, Max Gurtovoy wrote:
>
>
> On 5/29/2017 1:05 PM, Leon Romanovsky wrote:
> > On Sun, May 28, 2017@12:53:00PM +0300, Max Gurtovoy wrote:
> > >
> > >
> > > On 5/28/2017 12:07 PM, Christoph Hellwig wrote:
> > > > On Sun, May 28, 2017@10:53:11AM +0300, Max Gurtovoy wrote:
> > > > > Cache the needed umr_fence and set the wqe ctrl segmennt
> > > > > accordingly.
> > > >
> > > > Looks good,
> > > >
> > > > Reviewed-by: Christoph Hellwig <hch at lst.de>
> > >
> > > Thanks.
> > >
> > > >
> > > > But that whole fence logic looks awkward to me.  Does the following
> > > > patch to reorder it make sense to you?
> > > >
> > >
> > >
> > > Yes it make sense to me.
> > > Sagi/Leon, any comments ?
> >
> > Max,
> >
> > Do you see any performance impact for IB_WR_RDMA_READ, IB_WR_RDMA_WRITE
> > and IB_WR_RDMA_WRITE_WITH_IMM flows? They don't need fences and such
> > change can cause to performance losses.
> >
> > Thanks
> >
>
> We don't fence those WR's.
> Christoph just re-write it to be more intuitive code. I don't see logic
> difference, am I wrong here ?

A little bit, before Christoph's suggestion, we calculated fence for
the paths which need such fence, after we will calculate for all paths.

Thanks

>
> >
> > >
> > >
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