netdev - [PATCH] be2net: account for skb allocation failures

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date:	Wed, 13 Jul 2011 03:31:43 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	netdev <netdev@...r.kernel.org>,
	Ajit Khaparde <ajit.khaparde@...lex.com>
Subject: [PATCH] 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@...il.com>
CC: Ajit Khaparde <ajit.khaparde@...lex.com>
---
Note: This driver uses u64 fields without proper synch on 32bit arches.

 drivers/net/benet/be.h         |    1 +
 drivers/net/benet/be_ethtool.c |    1 +
 drivers/net/benet/be_main.c    |    4 ++--
 3 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/net/benet/be.h b/drivers/net/benet/be.h
index 9aa1534..72ec00f 100644
--- a/drivers/net/benet/be.h
+++ b/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;
diff --git a/drivers/net/benet/be_ethtool.c b/drivers/net/benet/be_ethtool.c
index 30c1386..7fd8130 100644
--- a/drivers/net/benet/be_ethtool.c
+++ b/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))
diff --git a/drivers/net/benet/be_main.c b/drivers/net/benet/be_main.c
index 4ebd700..f7d6d9d 100644
--- a/drivers/net/benet/be_main.c
+++ b/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;
 	}


--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html