Helper function to get driver's context out of ib_udata wrapped
in uverbs_attr_bundle for uer objects or NULL for kernel objects.
Signed-off-by: Shamir Rabinovitch <shamir.rabinovitch@xxxxxxxxxx>
---
include/rdma/ib_verbs.h | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h
index 94b6e1dd4dab..fb4d078d6db3 100644
--- a/include/rdma/ib_verbs.h
+++ b/include/rdma/ib_verbs.h
@@ -4264,4 +4264,18 @@ static inline struct ib_device *rdma_device_to_ibdev(struct device *device)
*/
#define rdma_device_to_drv_device(dev, drv_dev_struct, ibdev_member) \
container_of(rdma_device_to_ibdev(dev), drv_dev_struct, ibdev_member)
+
+/**
+ * rdma_udata_to_drv_context - Helper macro to get the driver's context out of
+ * ib_udata which is embadded in uverbs_attr_bundle.
+ *
+ * NOTE: This macro return NULL for kernel objects and valid driver context for
+ * user objects.
+ */
+#define rdma_udata_to_drv_context(udata, drv_dev_struct, member) \
+ ({ struct ib_ucontext *_ibctx = rdma_get_ucontext(udata); \
+ IS_ERR(_ibctx) ? NULL : \
+ container_of(_ibctx, drv_dev_struct, member); \
+ })
+
#endif /* IB_VERBS_H */
--
2.17.2
