netdev - [PATCH net-next] ipvlan: properly track tx

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Date: Thu, 26 Oct 2023 13:14:46 +0000
From: Eric Dumazet <edumazet@...gle.com>
To: "David S . Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>, 
	Paolo Abeni <pabeni@...hat.com>
Cc: netdev@...r.kernel.org, eric.dumazet@...il.com, 
	Eric Dumazet <edumazet@...gle.com>, Mahesh Bandewar <maheshb@...gle.com>
Subject: [PATCH net-next] ipvlan: properly track tx_errors

Both ipvlan_process_v4_outbound() and ipvlan_process_v6_outbound()
increment dev->stats.tx_errors in case of errors.

Unfortunately there are two issues :

1) ipvlan_get_stats64() does not propagate dev->stats.tx_errors to user.

2) Increments are not atomic. KCSAN would complain eventually.

Use DEV_STATS_INC() to not miss an update, and change ipvlan_get_stats64()
to copy the value back to user.

Fixes: 2ad7bf363841 ("ipvlan: Initial check-in of the IPVLAN driver.")
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Cc: Mahesh Bandewar <maheshb@...gle.com>
---
 drivers/net/ipvlan/ipvlan_core.c | 8 ++++----
 drivers/net/ipvlan/ipvlan_main.c | 1 +
 2 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ipvlan/ipvlan_core.c b/drivers/net/ipvlan/ipvlan_core.c
index c0c49f1813673acebdae2f3f52259fb6b9678c36..21e9cac7312186380fa60de11f0a9178080b74b0 100644
--- a/drivers/net/ipvlan/ipvlan_core.c
+++ b/drivers/net/ipvlan/ipvlan_core.c
@@ -441,12 +441,12 @@ static int ipvlan_process_v4_outbound(struct sk_buff *skb)
 
 	err = ip_local_out(net, skb->sk, skb);
 	if (unlikely(net_xmit_eval(err)))
-		dev->stats.tx_errors++;
+		DEV_STATS_INC(dev, tx_errors);
 	else
 		ret = NET_XMIT_SUCCESS;
 	goto out;
 err:
-	dev->stats.tx_errors++;
+	DEV_STATS_INC(dev, tx_errors);
 	kfree_skb(skb);
 out:
 	return ret;
@@ -482,12 +482,12 @@ static int ipvlan_process_v6_outbound(struct sk_buff *skb)
 
 	err = ip6_local_out(net, skb->sk, skb);
 	if (unlikely(net_xmit_eval(err)))
-		dev->stats.tx_errors++;
+		DEV_STATS_INC(dev, tx_errors);
 	else
 		ret = NET_XMIT_SUCCESS;
 	goto out;
 err:
-	dev->stats.tx_errors++;
+	DEV_STATS_INC(dev, tx_errors);
 	kfree_skb(skb);
 out:
 	return ret;
diff --git a/drivers/net/ipvlan/ipvlan_main.c b/drivers/net/ipvlan/ipvlan_main.c
index 1b55928e89b8a10706cc8c7911d6055d17987be6..57c79f5f29916b66154da2c8ff10238ef2c02584 100644
--- a/drivers/net/ipvlan/ipvlan_main.c
+++ b/drivers/net/ipvlan/ipvlan_main.c
@@ -324,6 +324,7 @@ static void ipvlan_get_stats64(struct net_device *dev,
 		s->rx_dropped = rx_errs;
 		s->tx_dropped = tx_drps;
 	}
+	s->tx_errors = DEV_STATS_READ(dev, tx_errors);
 }
 
 static int ipvlan_vlan_rx_add_vid(struct net_device *dev, __be16 proto, u16 vid)
-- 
2.42.0.758.gaed0368e0e-goog