This is a note to let you know that I've just added the patch titled
vxlan: Fix racy device stats updates.
to the 6.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
vxlan-fix-racy-device-stats-updates.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 84963967b168ca46896481eaf66f2d940be97c4d
Author: Guillaume Nault <gnault@xxxxxxxxxx>
Date: Fri Apr 26 17:27:17 2024 +0200
vxlan: Fix racy device stats updates.
[ Upstream commit 6dee402daba4eb8677a9438ebdcd8fe90ddd4326 ]
VXLAN devices update their stats locklessly. Therefore these counters
should either be stored in per-cpu data structures or the updates
should be done using atomic increments.
Since the net_device_core_stats infrastructure is already used in
vxlan_rcv(), use it for the other rx_dropped and tx_dropped counter
updates. Update the other counters atomically using DEV_STATS_INC().
Fixes: d342894c5d2f ("vxlan: virtual extensible lan")
Signed-off-by: Guillaume Nault <gnault@xxxxxxxxxx>
Reviewed-by: Eric Dumazet <edumazet@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/net/vxlan/vxlan_core.c b/drivers/net/vxlan/vxlan_core.c
index ecdf0276004f9..3d3c11e61f9de 100644
--- a/drivers/net/vxlan/vxlan_core.c
+++ b/drivers/net/vxlan/vxlan_core.c
@@ -1766,8 +1766,8 @@ static int vxlan_rcv(struct sock *sk, struct sk_buff *skb)
skb_reset_network_header(skb);
if (!vxlan_ecn_decapsulate(vs, oiph, skb)) {
- ++vxlan->dev->stats.rx_frame_errors;
- ++vxlan->dev->stats.rx_errors;
+ DEV_STATS_INC(vxlan->dev, rx_frame_errors);
+ DEV_STATS_INC(vxlan->dev, rx_errors);
vxlan_vnifilter_count(vxlan, vni, vninode,
VXLAN_VNI_STATS_RX_ERRORS, 0);
goto drop;
@@ -1837,7 +1837,7 @@ static int arp_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni)
goto out;
if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
- dev->stats.tx_dropped++;
+ dev_core_stats_tx_dropped_inc(dev);
goto out;
}
parp = arp_hdr(skb);
@@ -1893,7 +1893,7 @@ static int arp_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni)
reply->pkt_type = PACKET_HOST;
if (netif_rx(reply) == NET_RX_DROP) {
- dev->stats.rx_dropped++;
+ dev_core_stats_rx_dropped_inc(dev);
vxlan_vnifilter_count(vxlan, vni, NULL,
VXLAN_VNI_STATS_RX_DROPS, 0);
}
@@ -2052,7 +2052,7 @@ static int neigh_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni)
goto out;
if (netif_rx(reply) == NET_RX_DROP) {
- dev->stats.rx_dropped++;
+ dev_core_stats_rx_dropped_inc(dev);
vxlan_vnifilter_count(vxlan, vni, NULL,
VXLAN_VNI_STATS_RX_DROPS, 0);
}
@@ -2371,7 +2371,7 @@ static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
len);
} else {
drop:
- dev->stats.rx_dropped++;
+ dev_core_stats_rx_dropped_inc(dev);
vxlan_vnifilter_count(dst_vxlan, vni, NULL,
VXLAN_VNI_STATS_RX_DROPS, 0);
}
@@ -2403,7 +2403,7 @@ static int encap_bypass_if_local(struct sk_buff *skb, struct net_device *dev,
daddr->sa.sa_family, dst_port,
vxlan->cfg.flags);
if (!dst_vxlan) {
- dev->stats.tx_errors++;
+ DEV_STATS_INC(dev, tx_errors);
vxlan_vnifilter_count(vxlan, vni, NULL,
VXLAN_VNI_STATS_TX_ERRORS, 0);
kfree_skb(skb);
@@ -2664,7 +2664,7 @@ void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
return;
drop:
- dev->stats.tx_dropped++;
+ dev_core_stats_tx_dropped_inc(dev);
vxlan_vnifilter_count(vxlan, vni, NULL, VXLAN_VNI_STATS_TX_DROPS, 0);
dev_kfree_skb(skb);
return;
@@ -2672,11 +2672,11 @@ void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
tx_error:
rcu_read_unlock();
if (err == -ELOOP)
- dev->stats.collisions++;
+ DEV_STATS_INC(dev, collisions);
else if (err == -ENETUNREACH)
- dev->stats.tx_carrier_errors++;
+ DEV_STATS_INC(dev, tx_carrier_errors);
dst_release(ndst);
- dev->stats.tx_errors++;
+ DEV_STATS_INC(dev, tx_errors);
vxlan_vnifilter_count(vxlan, vni, NULL, VXLAN_VNI_STATS_TX_ERRORS, 0);
kfree_skb(skb);
}
@@ -2709,7 +2709,7 @@ static void vxlan_xmit_nh(struct sk_buff *skb, struct net_device *dev,
return;
drop:
- dev->stats.tx_dropped++;
+ dev_core_stats_tx_dropped_inc(dev);
vxlan_vnifilter_count(netdev_priv(dev), vni, NULL,
VXLAN_VNI_STATS_TX_DROPS, 0);
dev_kfree_skb(skb);
@@ -2747,7 +2747,7 @@ static netdev_tx_t vxlan_xmit_nhid(struct sk_buff *skb, struct net_device *dev,
return NETDEV_TX_OK;
drop:
- dev->stats.tx_dropped++;
+ dev_core_stats_tx_dropped_inc(dev);
vxlan_vnifilter_count(netdev_priv(dev), vni, NULL,
VXLAN_VNI_STATS_TX_DROPS, 0);
dev_kfree_skb(skb);
@@ -2844,7 +2844,7 @@ static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
!is_multicast_ether_addr(eth->h_dest))
vxlan_fdb_miss(vxlan, eth->h_dest);
- dev->stats.tx_dropped++;
+ dev_core_stats_tx_dropped_inc(dev);
vxlan_vnifilter_count(vxlan, vni, NULL,
VXLAN_VNI_STATS_TX_DROPS, 0);
kfree_skb(skb);
