IB/mad: Add MAD error codes from IBA spec

Add defines for MAD error codes so that they can be used when
returning error responses.

Signed-off-by: Swapna Thete <swapna.thete@qlogic.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
diff --git a/include/rdma/ib_mad.h b/include/rdma/ib_mad.h
index d3b9401..b513f57 100644
--- a/include/rdma/ib_mad.h
+++ b/include/rdma/ib_mad.h
@@ -77,6 +77,15 @@
 
 #define IB_MGMT_MAX_METHODS			128
 
+/* MAD Status field bit masks */
+#define IB_MGMT_MAD_STATUS_SUCCESS			0x0000
+#define IB_MGMT_MAD_STATUS_BUSY				0x0001
+#define IB_MGMT_MAD_STATUS_REDIRECT_REQD		0x0002
+#define IB_MGMT_MAD_STATUS_BAD_VERSION			0x0004
+#define IB_MGMT_MAD_STATUS_UNSUPPORTED_METHOD		0x0008
+#define IB_MGMT_MAD_STATUS_UNSUPPORTED_METHOD_ATTRIB	0x000c
+#define IB_MGMT_MAD_STATUS_INVALID_ATTRIB_VALUE		0x001c
+
 /* RMPP information */
 #define IB_MGMT_RMPP_VERSION			1