be2net: account for skb allocation failures

If we cannot allocate new skbs in RX completion handler, we should
increase netdevice rx_dropped counter, not spam console messages.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/benet/be.h

@@ -199,6 +199,7 @@ struct be_rx_stats {
 	u32 rx_polls;	/* number of times NAPI called poll function */
 	u32 rx_events;	/* number of ucast rx completion events  */
 	u32 rx_compl;	/* number of rx completion entries processed */
+	ulong rx_dropped; /* number of skb allocation errors */
 	ulong rx_jiffies;
 	u64 rx_bytes;
 	u64 rx_bytes_prev;

drivers/net/benet/be_ethtool.c

@@ -102,6 +102,7 @@ static const struct be_ethtool_stat et_rx_stats[] = {
 	{DRVSTAT_RX_INFO(rx_compl)},
 	{DRVSTAT_RX_INFO(rx_mcast_pkts)},
 	{DRVSTAT_RX_INFO(rx_post_fail)},
+	{DRVSTAT_RX_INFO(rx_dropped)},
 	{ERXSTAT_INFO(rx_drops_no_fragments)}
 };
 #define ETHTOOL_RXSTATS_NUM (ARRAY_SIZE(et_rx_stats))

drivers/net/benet/be_main.c

@@ -431,6 +431,7 @@ void netdev_stats_update(struct be_adapter *adapter)
 		pkts += rx_stats(rxo)->rx_pkts;
 		bytes += rx_stats(rxo)->rx_bytes;
 		mcast += rx_stats(rxo)->rx_mcast_pkts;
+		drops += rx_stats(rxo)->rx_dropped;
 		/*  no space in linux buffers: best possible approximation */
 		if (adapter->generation == BE_GEN3) {
 			if (!(lancer_chip(adapter))) {
@@ -1181,8 +1182,7 @@ static void be_rx_compl_process(struct be_adapter *adapter,
 
 	skb = netdev_alloc_skb_ip_align(netdev, BE_HDR_LEN);
 	if (unlikely(!skb)) {
-		if (net_ratelimit())
-			dev_warn(&adapter->pdev->dev, "skb alloc failed\n");
+		rxo->stats.rx_dropped++;
 		be_rx_compl_discard(adapter, rxo, rxcp);
 		return;
 	}