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* [PATCH net-next] net: bcmgenet: suppress warnings on failed Rx SKB allocations
@ 2020-04-23 23:02 Doug Berger
  2020-04-23 23:10 ` Florian Fainelli
  2020-04-24 23:50 ` David Miller
  0 siblings, 2 replies; 4+ messages in thread
From: Doug Berger @ 2020-04-23 23:02 UTC (permalink / raw)
  To: Florian Fainelli, David S. Miller
  Cc: bcm-kernel-feedback-list, netdev, linux-kernel, Doug Berger

The driver is designed to drop Rx packets and reclaim the buffers
when an allocation fails, and the network interface needs to safely
handle this packet loss. Therefore, an allocation failure of Rx
SKBs is relatively benign.

However, the output of the warning message occurs with a high
scheduling priority that can cause excessive jitter/latency for
other high priority processing.

This commit suppresses the warning messages to prevent scheduling
problems while retaining the failure count in the statistics of
the network interface.

Signed-off-by: Doug Berger <opendmb@gmail.com>
---
 drivers/net/ethernet/broadcom/genet/bcmgenet.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/broadcom/genet/bcmgenet.c b/drivers/net/ethernet/broadcom/genet/bcmgenet.c
index 20aba79becce..bfeff5585f4b 100644
--- a/drivers/net/ethernet/broadcom/genet/bcmgenet.c
+++ b/drivers/net/ethernet/broadcom/genet/bcmgenet.c
@@ -1617,7 +1617,8 @@ static struct sk_buff *bcmgenet_rx_refill(struct bcmgenet_priv *priv,
 	dma_addr_t mapping;
 
 	/* Allocate a new Rx skb */
-	skb = netdev_alloc_skb(priv->dev, priv->rx_buf_len + SKB_ALIGNMENT);
+	skb = __netdev_alloc_skb(priv->dev, priv->rx_buf_len + SKB_ALIGNMENT,
+				 GFP_ATOMIC | __GFP_NOWARN);
 	if (!skb) {
 		priv->mib.alloc_rx_buff_failed++;
 		netif_err(priv, rx_err, priv->dev,
-- 
2.7.4


^ permalink raw reply related	[flat|nested] 4+ messages in thread

end of thread, other threads:[~2020-04-24 23:50 UTC | newest]

Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
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2020-04-23 23:02 [PATCH net-next] net: bcmgenet: suppress warnings on failed Rx SKB allocations Doug Berger
2020-04-23 23:10 ` Florian Fainelli
2020-04-24 23:49   ` David Miller
2020-04-24 23:50 ` David Miller

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