be2net: add a description for counter rx_input_fifo_overflow_drop

Signed-off-by: Sathya Perla <sathya.perla@emulex.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/emulex/benet/be_ethtool.c

@@ -78,6 +78,11 @@ static const struct be_ethtool_stat et_stats[] = {
 	 * fifo must never overflow.
 	 */
 	{DRVSTAT_INFO(rxpp_fifo_overflow_drop)},
+	/* Received packets dropped when the RX block runs out of space in
+	 * one of its input FIFOs. This could happen due a long burst of
+	 * minimum-sized (64b) frames in the receive path.
+	 * This counter may also be erroneously incremented rarely.
+	 */
 	{DRVSTAT_INFO(rx_input_fifo_overflow_drop)},
 	{DRVSTAT_INFO(rx_ip_checksum_errs)},
 	{DRVSTAT_INFO(rx_tcp_checksum_errs)},