From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Steve Wise" <swise@opengridcomputing.com>
Subject: RE: [PATCH 7/9] IB/core: generic RDMA READ/WRITE API
Date: Tue, 1 Mar 2016 09:44:50 -0600
Message-ID: <005d01d173d1$4a6028b0$df207a10$@opengridcomputing.com>
References: <1456784410-20166-1-git-send-email-hch@lst.de> <1456784410-20166-8-git-send-email-hch@lst.de> <56D4C615.5010202@opengridcomputing.com> <56D55A1B.6030902@dev.mellanox.co.il>
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To: 'Sagi Grimberg' <sagig@dev.mellanox.co.il>, 'Christoph Hellwig' <hch@lst.de>, linux-rdma@vger.kernel.org
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> >> +    if (rdma_rw_use_mr(qp->device, port_num)) {
> >> +        ret = rdma_rw_init_mr_wrs(ctx, qp, port_num, sg, sg_offset,
> >> +                remote_addr, rkey, dir);
> >
> > At some point I would like the iWARP IO to do no-mr for WRITE/dma_nents
> > == 1, and WRITE/dma_nents <= max_send_sge for the device. I think this
> > will help smaller iSER/NVMEF READ IOPs.  I'm testing this out now on the
> > NVMEF code, which is slightly different.  If it proves out to better the
> > performance, I'll post a follow-on patch...
> 
> Is this possible given that pd->local_dma_lkey has only local
> permissions?

The source of an RDMA WRITE doesn't need remote permissions.