net: stmmac: don't stop NAPI processing when dropping a packet

commit 07b3975 upstream.

Currently, if we drop a packet, we exit from NAPI loop before the budget
is consumed. In some situations this will make the RX processing stall
e.g. when flood pinging the system with oversized packets, as the
errorneous packets are not dropped efficiently.

If we drop a packet, we should just continue to the next one as long as
the budget allows.

Signed-off-by: Aaro Koskinen <aaro.koskinen@nokia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
[acj: backport v4.9 -stable
-adjust context]
Signed-off-by: Aviraj CJ <acj@cisco.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/net/ethernet/stmicro/stmmac/stmmac_main.c

@@ -2499,8 +2499,7 @@ static inline void stmmac_rx_refill(struct stmmac_priv *priv)
  */
 static int stmmac_rx(struct stmmac_priv *priv, int limit)
 {
-	unsigned int entry = priv->cur_rx;
-	unsigned int next_entry;
+	unsigned int next_entry = priv->cur_rx;
 	unsigned int count = 0;
 	int coe = priv->hw->rx_csum;
 
@@ -2516,10 +2515,12 @@ static int stmmac_rx(struct stmmac_priv *priv, int limit)
 		priv->hw->desc->display_ring(rx_head, DMA_RX_SIZE, true);
 	}
 	while (count < limit) {
-		int status;
+		int entry, status;
 		struct dma_desc *p;
 		struct dma_desc *np;
 
+		entry = next_entry;
+
 		if (priv->extend_desc)
 			p = (struct dma_desc *)(priv->dma_erx + entry);
 		else
@@ -2584,7 +2585,7 @@ static int stmmac_rx(struct stmmac_priv *priv, int limit)
 				       priv->dev->name, frame_len,
 				       priv->dma_buf_sz);
 				priv->dev->stats.rx_length_errors++;
-				break;
+				continue;
 			}
 
 			/* ACS is set; GMAC core strips PAD/FCS for IEEE 802.3
@@ -2615,7 +2616,7 @@ static int stmmac_rx(struct stmmac_priv *priv, int limit)
 						dev_warn(priv->device,
 							 "packet dropped\n");
 					priv->dev->stats.rx_dropped++;
-					break;
+					continue;
 				}
 
 				dma_sync_single_for_cpu(priv->device,
@@ -2638,7 +2639,7 @@ static int stmmac_rx(struct stmmac_priv *priv, int limit)
 					pr_err("%s: Inconsistent Rx chain\n",
 					       priv->dev->name);
 					priv->dev->stats.rx_dropped++;
-					break;
+					continue;
 				}
 				prefetch(skb->data - NET_IP_ALIGN);
 				priv->rx_skbuff[entry] = NULL;
@@ -2672,7 +2673,6 @@ static int stmmac_rx(struct stmmac_priv *priv, int limit)
 			priv->dev->stats.rx_packets++;
 			priv->dev->stats.rx_bytes += frame_len;
 		}
-		entry = next_entry;
 	}
 
 	stmmac_rx_refill(priv);