RDMA/cma: Add support for RDMA_PS_UDP

Allow the use of UD QPs through the rdma_cm, in order to provide
address translation services for resolving IB addresses for datagram
messages using SIDR.

Signed-off-by: Sean Hefty <sean.hefty@intel.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

2 files changed, 18 insertions, 0 deletions

diff --git a/include/rdma/rdma_cm.h b/include/rdma/rdma_cm.h
index 6b8ec486d06b..36cd8a8526a0 100644
--- a/include/rdma/rdma_cm.h
+++ b/include/rdma/rdma_cm.h
@@ -90,11 +90,20 @@ struct rdma_conn_param {
         u32 qp_num;
 };
 
+struct rdma_ud_param {
+        const void *private_data;
+        u8 private_data_len;
+        struct ib_ah_attr ah_attr;
+        u32 qp_num;
+        u32 qkey;
+};
+
 struct rdma_cm_event {
         enum rdma_cm_event_type  event;
         int                      status;
         union {
                 struct rdma_conn_param  conn;
+                struct rdma_ud_param    ud;
         } param;
 };
 
@@ -220,9 +229,15 @@ int rdma_init_qp_attr(struct rdma_cm_id *id, struct ib_qp_attr *qp_attr,
 
 /**
  * rdma_connect - Initiate an active connection request.
+ * @id: Connection identifier to connect.
+ * @conn_param: Connection information used for connected QPs.
  *
  * Users must have resolved a route for the rdma_cm_id to connect with
  * by having called rdma_resolve_route before calling this routine.
+ *
+ * This call will either connect to a remote QP or obtain remote QP
+ * information for unconnected rdma_cm_id's.  The actual operation is
+ * based on the rdma_cm_id's port space.
  */
 int rdma_connect(struct rdma_cm_id *id, struct rdma_conn_param *conn_param);
 
diff --git a/include/rdma/rdma_cm_ib.h b/include/rdma/rdma_cm_ib.h
index e8c3af1804d4..9b176df1d667 100644
--- a/include/rdma/rdma_cm_ib.h
+++ b/include/rdma/rdma_cm_ib.h
@@ -44,4 +44,7 @@
 int rdma_set_ib_paths(struct rdma_cm_id *id,
                       struct ib_sa_path_rec *path_rec, int num_paths);
 
+/* Global qkey for UD QPs and multicast groups. */
+#define RDMA_UD_QKEY 0x01234567
+
 #endif /* RDMA_CM_IB_H */