netdev - Re: [net-next][PATCH 2/2] rds: add sysctl for rds support of On-Demand-Paging

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Date:   Fri, 26 Apr 2019 10:37:40 +0800
From:   Yanjun Zhu <yanjun.zhu@...cle.com>
To:     Santosh Shilimkar <santosh.shilimkar@...cle.com>,
        netdev@...r.kernel.org, davem@...emloft.net
Subject: Re: [net-next][PATCH 2/2] rds: add sysctl for rds support of
 On-Demand-Paging


On 2019/4/26 8:44, Santosh Shilimkar wrote:
> RDS doesn't support RDMA on memory apertures that require On Demand
> Paging (ODP), such as FS DAX memory. A sysctl is added to indicate
> whether RDMA requiring ODP is supported.
>
> Reviewed-by: Håkon Bugge <haakon.bugge@...cle.com>
> Reviewed-tested-by: Zhu Yanjun <yanjun.zhu@...cle.com>

Thanks, Santosh

Zhu Yanjun

> Signed-off-by: Hans Westgaard Ry <hans.westgaard.ry@...cle.com>
> Signed-off-by: Santosh Shilimkar <santosh.shilimkar@...cle.com>
> ---
>   net/rds/ib.h        | 1 +
>   net/rds/ib_sysctl.c | 8 ++++++++
>   2 files changed, 9 insertions(+)
>
> diff --git a/net/rds/ib.h b/net/rds/ib.h
> index 67a715b..80e11ef 100644
> --- a/net/rds/ib.h
> +++ b/net/rds/ib.h
> @@ -457,5 +457,6 @@ unsigned int rds_ib_stats_info_copy(struct rds_info_iterator *iter,
>   extern unsigned long rds_ib_sysctl_max_unsig_bytes;
>   extern unsigned long rds_ib_sysctl_max_recv_allocation;
>   extern unsigned int rds_ib_sysctl_flow_control;
> +extern unsigned int rds_ib_sysctl_odp_support;
>   
>   #endif
> diff --git a/net/rds/ib_sysctl.c b/net/rds/ib_sysctl.c
> index e4e41b3..7cc02cd 100644
> --- a/net/rds/ib_sysctl.c
> +++ b/net/rds/ib_sysctl.c
> @@ -60,6 +60,7 @@
>    * will cause credits to be added before protocol negotiation.
>    */
>   unsigned int rds_ib_sysctl_flow_control = 0;
> +unsigned int rds_ib_sysctl_odp_support;
>   
>   static struct ctl_table rds_ib_sysctl_table[] = {
>   	{
> @@ -103,6 +104,13 @@
>   		.mode		= 0644,
>   		.proc_handler	= proc_dointvec,
>   	},
> +	{
> +		.procname       = "odp_support",
> +		.data           = &rds_ib_sysctl_odp_support,
> +		.maxlen         = sizeof(rds_ib_sysctl_odp_support),
> +		.mode           = 0444,
> +		.proc_handler   = proc_dointvec,
> +	},
>   	{ }
>   };
>