+/* NRT Buffer descriptor definition
+ * Each buffer descriptor points to a max 32 byte block and has 32 bit in size
+ * to have atomic operation.
+ * PRU can address bytewise into memory.
+ * Definition of 32 bit descriptor is as follows
+ *
+ * Bits		Name			Meaning
+ * =============================================================================
+ * 0..7		Index		points to index in buffer queue, max 256 x 32
+ *				byte blocks can be addressed
+ * 6		LookupSuccess	For switch, FDB lookup was successful (source
+ *				MAC address found in FDB).
+ *				For RED, NodeTable lookup was successful.
+ * 7		Flood		Packet should be flooded (destination MAC
+ *				address found in FDB). For switch only.
+ * 8..12	Block_length	number of valid bytes in this specific block.
+ *				Will be <=32 bytes on last block of packet
+ * 13		More		"More" bit indicating that there are more blocks
+ * 14		Shadow		indicates that "index" is pointing into shadow
+ *				buffer
+ * 15		TimeStamp	indicates that this packet has time stamp in
+ *				separate buffer - only needed of PTCP runs on

only needed if PTCP runs on host

+ *				host
+ * 16..17	Port		different meaning for ingress and egress,
+ *				Ingress: Port = 0 indicates phy port 1 and
+ *				Port = 1 indicates phy port 2.
+ *				Egress: 0 sends on phy port 1 and 1 sends on
+ *				phy port 2. Port = 2 goes over MAC table
+ *				look-up
+ * 18..28	Length		11 bit of total packet length which is put into
+ *				first BD only so that host access only one BD
+ * 29		VlanTag		indicates that packet has Length/Type field of
+ *				0x08100 with VLAN tag in following byte
+ * 30		Broadcast	indicates that packet goes out on both physical
+ *				ports,	there will be two bd but only one buffer
+ * 31		Error		indicates there was an error in the packet
+ */
+#define PRUETH_BD_START_FLAG_MASK	BIT(0)
+#define PRUETH_BD_START_FLAG_SHIFT	0
+
+#define PRUETH_BD_HSR_FRAME_MASK	BIT(4)
+#define PRUETH_BD_HSR_FRAME_SHIFT	4
+
+#define PRUETH_BD_SUP_HSR_FRAME_MASK	BIT(5)
+#define PRUETH_BD_SUP_HSR_FRAME_SHIFT	5
+
+#define PRUETH_BD_LOOKUP_SUCCESS_MASK	BIT(6)
+#define PRUETH_BD_LOOKUP_SUCCESS_SHIFT	6
+
+#define PRUETH_BD_SW_FLOOD_MASK		BIT(7)
+#define PRUETH_BD_SW_FLOOD_SHIFT	7
+
+#define	PRUETH_BD_SHADOW_MASK		BIT(14)
+#define	PRUETH_BD_SHADOW_SHIFT		14
+
+#define PRUETH_BD_TIMESTAMP_MASK	BIT(15)
+#define PRUETH_BD_TIMESTAMP_SHIT	15

typo PRUETH_BD_TIMESTAMP_SHIT -> PRUETH_BD_TIMESTAMP_SHIFT

+
+#define PRUETH_BD_PORT_MASK		GENMASK(17, 16)
+#define PRUETH_BD_PORT_SHIFT		16
+
+#define PRUETH_BD_LENGTH_MASK		GENMASK(28, 18)
+#define PRUETH_BD_LENGTH_SHIFT		18
+
+#define PRUETH_BD_BROADCAST_MASK	BIT(30)
+#define PRUETH_BD_BROADCAST_SHIFT	30
+
+#define PRUETH_BD_ERROR_MASK		BIT(31)
+#define PRUETH_BD_ERROR_SHIFT		31
+

Thanks,
Alok