On Mon, Apr 29, 2019 at 04:37:20PM -0700, 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.bu...@oracle.com>
> Reviewed-tested-by: Zhu Yanjun <yanjun....@oracle.com>
> Signed-off-by: Hans Westgaard Ry <hans.westgaard...@oracle.com>
> Signed-off-by: Santosh Shilimkar <santosh.shilim...@oracle.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
> +++ 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
> +++ 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,
> + },
> { }
> };
using a read-only sysctl as a capability negotiation scheme seems
horrible to me
Jason
