diff --git a/fs/smb/common/smbdirect/smbdirect_pdu.h b/fs/smb/common/smbdirect/smbdirect_pdu.h
index ae9fdb05ce23..7693ba337873 100644
--- a/fs/smb/common/smbdirect/smbdirect_pdu.h
+++ b/fs/smb/common/smbdirect/smbdirect_pdu.h
@@ -8,6 +8,10 @@
 
 #define SMBDIRECT_V1 0x0100
 
+/* SMBD minimum receive size and fragmented sized defined in [MS-SMBD] */
+#define SMBDIRECT_MIN_RECEIVE_SIZE		128
+#define SMBDIRECT_MIN_FRAGMENTED_SIZE		131072
+
 /* SMBD negotiation request packet [MS-SMBD] 2.2.1 */
 struct smbdirect_negotiate_req {
 	__le16 min_version;