v4.19.13 snapshot.
diff --git a/include/linux/blk-mq-rdma.h b/include/linux/blk-mq-rdma.h
new file mode 100644
index 0000000..b4ade19
--- /dev/null
+++ b/include/linux/blk-mq-rdma.h
@@ -0,0 +1,10 @@
+#ifndef _LINUX_BLK_MQ_RDMA_H
+#define _LINUX_BLK_MQ_RDMA_H
+
+struct blk_mq_tag_set;
+struct ib_device;
+
+int blk_mq_rdma_map_queues(struct blk_mq_tag_set *set,
+		struct ib_device *dev, int first_vec);
+
+#endif /* _LINUX_BLK_MQ_RDMA_H */