diff mbox series

[2/2] net: stmmac: don't stop NAPI processing when dropping a packet

Message ID 20191210170659.61829-2-acj@cisco.com
State Not Applicable
Delegated to: David Miller
Headers show
Series [1/2] net: stmmac: use correct DMA buffer size in the RX descriptor | expand

Commit Message

Aviraj CJ Dec. 10, 2019, 5:06 p.m. UTC 
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.

[ Adopted based on upstream commit 2170bbf19f6ef6b2740f186ee107827f31395218
("net: stmmac: don't stop NAPI processing when dropping a packet")
by Aaro Koskinen <aaro.koskinen@nokia.com> ]

Signed-off-by: Aviraj CJ <acj@cisco.com>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)
diff mbox series

Patch

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index e9d41e03121c..3b514ba570b8 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -2176,8 +2176,7 @@  static inline void stmmac_rx_refill(struct stmmac_priv *priv)
 static int stmmac_rx(struct stmmac_priv *priv, int limit)
 {
 	unsigned int rxsize = priv->dma_rx_size;
-	unsigned int entry = priv->cur_rx % rxsize;
-	unsigned int next_entry;
+	unsigned int next_entry = priv->cur_rx % rxsize;
 	unsigned int count = 0;
 	int coe = priv->hw->rx_csum;
 
@@ -2191,6 +2190,9 @@  static int stmmac_rx(struct stmmac_priv *priv, int limit)
 	while (count < limit) {
 		int status;
 		struct dma_desc *p;
+		unsigned int entry;
+
+		entry = next_entry;
 
 		if (priv->extend_desc)
 			p = (struct dma_desc *)(priv->dma_erx + entry);
@@ -2239,7 +2241,7 @@  static int stmmac_rx(struct stmmac_priv *priv, int limit)
 			/*  check if frame_len fits the preallocated memory */
 			if (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
@@ -2260,7 +2262,7 @@  static int stmmac_rx(struct stmmac_priv *priv, int limit)
 				pr_err("%s: Inconsistent Rx descriptor chain\n",
 				       priv->dev->name);
 				priv->dev->stats.rx_dropped++;
-				break;
+				continue;
 			}
 			prefetch(skb->data - NET_IP_ALIGN);
 			priv->rx_skbuff[entry] = NULL;
@@ -2291,7 +2293,6 @@  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);