From: Steve Wise <swise@opengridcomputing.com>
Date: Thu, 10 May 2018 07:31:36 -0700
Subject: RDMA/CMA: add rdma_iw_cm_id() and rdma_res_to_id() helpers
Patch-mainline: v4.18-rc1
Git-commit: fbdb0a9181cb4c489a857f6bf71648276c85969c
References: bsc#1103992 FATE#326009

Add a helper function for iwarp drivers to be able to map an
rdma_cm_id to an iw_cm_id.  This is useful for dumping driver specific
NLDEV/RESTRACK connection state.

Add a helper to return the rdma_cm_id pointer from the rdma_restack
pointer.  This is needed for rdma drivers to map a res entry back to
the public rdma_cm_id struct.

Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/infiniband/core/cma.c |   28 ++++++++++++++++++++++++++++
 include/rdma/rdma_cm.h        |    3 +++
 2 files changed, 31 insertions(+)

--- a/drivers/infiniband/core/cma.c
+++ b/drivers/infiniband/core/cma.c
@@ -146,6 +146,34 @@ const void *rdma_consumer_reject_data(st
 }
 EXPORT_SYMBOL(rdma_consumer_reject_data);
 
+/**
+ * rdma_iw_cm_id() - return the iw_cm_id pointer for this cm_id.
+ * @id: Communication Identifier
+ */
+struct iw_cm_id *rdma_iw_cm_id(struct rdma_cm_id *id)
+{
+	struct rdma_id_private *id_priv;
+
+	id_priv = container_of(id, struct rdma_id_private, id);
+	if (id->device->node_type == RDMA_NODE_RNIC)
+		return id_priv->cm_id.iw;
+	return NULL;
+}
+EXPORT_SYMBOL(rdma_iw_cm_id);
+
+/**
+ * rdma_res_to_id() - return the rdma_cm_id pointer for this restrack.
+ * @res: rdma resource tracking entry pointer
+ */
+struct rdma_cm_id *rdma_res_to_id(struct rdma_restrack_entry *res)
+{
+	struct rdma_id_private *id_priv =
+		container_of(res, struct rdma_id_private, res);
+
+	return &id_priv->id;
+}
+EXPORT_SYMBOL(rdma_res_to_id);
+
 static void cma_add_one(struct ib_device *device);
 static void cma_remove_one(struct ib_device *device, void *client_data);
 
--- a/include/rdma/rdma_cm.h
+++ b/include/rdma/rdma_cm.h
@@ -420,4 +420,7 @@ const void *rdma_consumer_reject_data(st
 void rdma_read_gids(struct rdma_cm_id *cm_id, union ib_gid *sgid,
 		    union ib_gid *dgid);
 
+struct iw_cm_id *rdma_iw_cm_id(struct rdma_cm_id *cm_id);
+struct rdma_cm_id *rdma_res_to_id(struct rdma_restrack_entry *res);
+
 #endif /* RDMA_CM_H */