net: enetc: recycle buffers for frames with RX errors

When receiving a frame with errors, currently we do nothing with it (we
don't construct an skb or an xdp_buff), we just exit the NAPI poll loop.

Let's put the buffer back into the RX ring (similar to XDP_DROP).
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/freescale/enetc/enetc.c

@@ -822,12 +822,14 @@ static bool enetc_check_bd_errors_and_consume(struct enetc_bdr *rx_ring,
 	if (likely(!(bd_status & ENETC_RXBD_LSTATUS(ENETC_RXBD_ERR_MASK))))
 		return false;
 
+	enetc_put_rx_buff(rx_ring, &rx_ring->rx_swbd[*i]);
 	enetc_rxbd_next(rx_ring, rxbd, i);
 
 	while (!(bd_status & ENETC_RXBD_LSTATUS_F)) {
 		dma_rmb();
 		bd_status = le32_to_cpu((*rxbd)->r.lstatus);
 
+		enetc_put_rx_buff(rx_ring, &rx_ring->rx_swbd[*i]);
 		enetc_rxbd_next(rx_ring, rxbd, i);
 	}