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: <04420039-1877-c35d-83ce-b7365c1e6b65@acm.org>
Date:   Mon, 7 Oct 2019 08:12:37 -0700
From:   Bart Van Assche <bvanassche@....org>
To:     Leon Romanovsky <leon@...nel.org>,
        Doug Ledford <dledford@...hat.com>,
        Jason Gunthorpe <jgg@...lanox.com>,
        Christoph Hellwig <hch@...radead.org>
Cc:     Leon Romanovsky <leonro@...lanox.com>,
        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 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?

> +	u32			max_sgl_rd;

Thanks,

Bart.