netdev - Re: [PATCH rdma-next v2 2/3] RDMA/rw: Support threshold for registration vs scattering to local pages

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Message-ID: <20191007155803.GA5855@unreal>
Date:   Mon, 7 Oct 2019 18:58:03 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     Bart Van Assche <bvanassche@....org>
Cc:     Doug Ledford <dledford@...hat.com>,
        Jason Gunthorpe <jgg@...lanox.com>,
        Christoph Hellwig <hch@...radead.org>,
        RDMA mailing list <linux-rdma@...r.kernel.org>,
        Or Gerlitz <ogerlitz@...lanox.com>,
        Yamin Friedman <yaminf@...lanox.com>,
        Saeed Mahameed <saeedm@...lanox.com>,
        linux-netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH rdma-next v2 2/3] RDMA/rw: Support threshold for
 registration vs scattering to local pages

On Mon, Oct 07, 2019 at 08:12:37AM -0700, Bart Van Assche wrote:
> On 10/7/19 6:59 AM, Leon Romanovsky wrote:
> > diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h
> > index 4f671378dbfc..60fd98a9b7e8 100644
> > --- a/include/rdma/ib_verbs.h
> > +++ b/include/rdma/ib_verbs.h
> > @@ -445,6 +445,8 @@ struct ib_device_attr {
> >   	struct ib_tm_caps	tm_caps;
> >   	struct ib_cq_caps       cq_caps;
> >   	u64			max_dm_size;
> > +	/* Max entries for sgl for optimized performance per READ */
>                                    ^^^^^^^^^
>                                    optimal?
>
> Should it be mentioned that zero means that the HCA has not set this
> parameter?

It is always the case for other max_* values.

>
> > +	u32			max_sgl_rd;
>
> Thanks,
>
> Bart.