IB/cma: Add configfs for rdma_cm
Users would like to control the behaviour of rdma_cm.
For example, old applications which don't set the
required RoCE gid type could be executed on RoCE V2
network types. In order to support this configuration,
we implement a configfs for rdma_cm.
In order to use the configfs, one needs to mount it and
mkdir <IB device name> inside rdma_cm directory.
The patch adds support for a single configuration file,
default_roce_mode. The mode can either be "IB/RoCE v1" or
"RoCE v2".
Signed-off-by: Matan Barak <matanb@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
diff --git a/Documentation/ABI/testing/configfs-rdma_cm b/Documentation/ABI/testing/configfs-rdma_cm
new file mode 100644
index 0000000..5c389aa
--- /dev/null
+++ b/Documentation/ABI/testing/configfs-rdma_cm
@@ -0,0 +1,22 @@
+What: /config/rdma_cm
+Date: November 29, 2015
+KernelVersion: 4.4.0
+Description: Interface is used to configure RDMA-cable HCAs in respect to
+ RDMA-CM attributes.
+
+ Attributes are visible only when configfs is mounted. To mount
+ configfs in /config directory use:
+ # mount -t configfs none /config/
+
+ In order to set parameters related to a specific HCA, a directory
+ for this HCA has to be created:
+ mkdir -p /config/rdma_cm/<hca>
+
+
+What: /config/rdma_cm/<hca>/ports/<port-num>/default_roce_mode
+Date: November 29, 2015
+KernelVersion: 4.4.0
+Description: RDMA-CM based connections from HCA <hca> at port <port-num>
+ will be initiated with this RoCE type as default.
+ The possible RoCE types are either "IB/RoCE v1" or "RoCE v2".
+ This parameter has RW access.
