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authorAaro Koskinen <aaro.koskinen@nokia.com>2019-03-27 22:35:37 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2019-12-21 10:35:48 +0100
commitd99cffe879565843439af900d1d781adadac65d0 (patch)
treea30e1537c5e0263bc27701de2a9bde944ab073cb
parent9b6cc392668413594ef42b64c470625de1f6ade0 (diff)
net: stmmac: don't stop NAPI processing when dropping a packet
commit 07b3975352374c3f5ebb4a42ef0b253fe370542d 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 v4.4 -stable -adjust context] Signed-off-by: Aviraj CJ <acj@cisco.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--drivers/net/ethernet/stmicro/stmmac/stmmac_main.c12
1 files changed, 6 insertions, 6 deletions
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index e9d41e03121c..28a6b7764044 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;
@@ -2189,9 +2188,11 @@ static int stmmac_rx(struct stmmac_priv *priv, int limit)
stmmac_display_ring((void *)priv->dma_rx, rxsize, 0);
}
while (count < limit) {
- int status;
+ int status, entry;
struct dma_desc *p;
+ entry = next_entry;
+
if (priv->extend_desc)
p = (struct dma_desc *)(priv->dma_erx + entry);
else
@@ -2239,7 +2240,7 @@ 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 +2261,7 @@ 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 +2292,6 @@ 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);