This is a note to let you know that I've just added the patch titled
net: add atomic_long_t to net_device_stats fields
to the 4.19-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:
net-add-atomic_long_t-to-net_device_stats-fields.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 461a34b0f29813a77a4449dad4ec53db1a2599f6
Author: Eric Dumazet <edumazet@xxxxxxxxxx>
Date: Tue Nov 15 08:53:55 2022 +0000
net: add atomic_long_t to net_device_stats fields
[ Upstream commit 6c1c5097781f563b70a81683ea6fdac21637573b ]
Long standing KCSAN issues are caused by data-race around
some dev->stats changes.
Most performance critical paths already use per-cpu
variables, or per-queue ones.
It is reasonable (and more correct) to use atomic operations
for the slow paths.
This patch adds an union for each field of net_device_stats,
so that we can convert paths that are not yet protected
by a spinlock or a mutex.
netdev_stats_to_stats64() no longer has an #if BITS_PER_LONG==64
Note that the memcpy() we were using on 64bit arches
had no provision to avoid load-tearing,
while atomic_long_read() is providing the needed protection
at no cost.
Signed-off-by: Eric Dumazet <edumazet@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Stable-dep-of: 44bdb313da57 ("net: bridge: use DEV_STATS_INC()")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 7e9df3854420a..e977118111f61 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -162,31 +162,38 @@ static inline bool dev_xmit_complete(int rc)
* (unsigned long) so they can be read and written atomically.
*/
+#define NET_DEV_STAT(FIELD) \
+ union { \
+ unsigned long FIELD; \
+ atomic_long_t __##FIELD; \
+ }
+
struct net_device_stats {
- unsigned long rx_packets;
- unsigned long tx_packets;
- unsigned long rx_bytes;
- unsigned long tx_bytes;
- unsigned long rx_errors;
- unsigned long tx_errors;
- unsigned long rx_dropped;
- unsigned long tx_dropped;
- unsigned long multicast;
- unsigned long collisions;
- unsigned long rx_length_errors;
- unsigned long rx_over_errors;
- unsigned long rx_crc_errors;
- unsigned long rx_frame_errors;
- unsigned long rx_fifo_errors;
- unsigned long rx_missed_errors;
- unsigned long tx_aborted_errors;
- unsigned long tx_carrier_errors;
- unsigned long tx_fifo_errors;
- unsigned long tx_heartbeat_errors;
- unsigned long tx_window_errors;
- unsigned long rx_compressed;
- unsigned long tx_compressed;
+ NET_DEV_STAT(rx_packets);
+ NET_DEV_STAT(tx_packets);
+ NET_DEV_STAT(rx_bytes);
+ NET_DEV_STAT(tx_bytes);
+ NET_DEV_STAT(rx_errors);
+ NET_DEV_STAT(tx_errors);
+ NET_DEV_STAT(rx_dropped);
+ NET_DEV_STAT(tx_dropped);
+ NET_DEV_STAT(multicast);
+ NET_DEV_STAT(collisions);
+ NET_DEV_STAT(rx_length_errors);
+ NET_DEV_STAT(rx_over_errors);
+ NET_DEV_STAT(rx_crc_errors);
+ NET_DEV_STAT(rx_frame_errors);
+ NET_DEV_STAT(rx_fifo_errors);
+ NET_DEV_STAT(rx_missed_errors);
+ NET_DEV_STAT(tx_aborted_errors);
+ NET_DEV_STAT(tx_carrier_errors);
+ NET_DEV_STAT(tx_fifo_errors);
+ NET_DEV_STAT(tx_heartbeat_errors);
+ NET_DEV_STAT(tx_window_errors);
+ NET_DEV_STAT(rx_compressed);
+ NET_DEV_STAT(tx_compressed);
};
+#undef NET_DEV_STAT
#include <linux/cache.h>
@@ -4842,4 +4849,9 @@ do { \
#define PTYPE_HASH_SIZE (16)
#define PTYPE_HASH_MASK (PTYPE_HASH_SIZE - 1)
+/* Note: Avoid these macros in fast path, prefer per-cpu or per-queue counters. */
+#define DEV_STATS_INC(DEV, FIELD) atomic_long_inc(&(DEV)->stats.__##FIELD)
+#define DEV_STATS_ADD(DEV, FIELD, VAL) \
+ atomic_long_add((VAL), &(DEV)->stats.__##FIELD)
+
#endif /* _LINUX_NETDEVICE_H */
diff --git a/include/net/dst.h b/include/net/dst.h
index 50258a8131377..97267997601f5 100644
--- a/include/net/dst.h
+++ b/include/net/dst.h
@@ -362,9 +362,8 @@ static inline void __skb_tunnel_rx(struct sk_buff *skb, struct net_device *dev,
static inline void skb_tunnel_rx(struct sk_buff *skb, struct net_device *dev,
struct net *net)
{
- /* TODO : stats should be SMP safe */
- dev->stats.rx_packets++;
- dev->stats.rx_bytes += skb->len;
+ DEV_STATS_INC(dev, rx_packets);
+ DEV_STATS_ADD(dev, rx_bytes, skb->len);
__skb_tunnel_rx(skb, dev, net);
}
diff --git a/net/core/dev.c b/net/core/dev.c
index a9c8660a2570f..3bf40c288c032 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -9035,24 +9035,16 @@ void netdev_run_todo(void)
void netdev_stats_to_stats64(struct rtnl_link_stats64 *stats64,
const struct net_device_stats *netdev_stats)
{
-#if BITS_PER_LONG == 64
- BUILD_BUG_ON(sizeof(*stats64) < sizeof(*netdev_stats));
- memcpy(stats64, netdev_stats, sizeof(*netdev_stats));
- /* zero out counters that only exist in rtnl_link_stats64 */
- memset((char *)stats64 + sizeof(*netdev_stats), 0,
- sizeof(*stats64) - sizeof(*netdev_stats));
-#else
- size_t i, n = sizeof(*netdev_stats) / sizeof(unsigned long);
- const unsigned long *src = (const unsigned long *)netdev_stats;
+ size_t i, n = sizeof(*netdev_stats) / sizeof(atomic_long_t);
+ const atomic_long_t *src = (atomic_long_t *)netdev_stats;
u64 *dst = (u64 *)stats64;
BUILD_BUG_ON(n > sizeof(*stats64) / sizeof(u64));
for (i = 0; i < n; i++)
- dst[i] = src[i];
+ dst[i] = atomic_long_read(&src[i]);
/* zero out counters that only exist in rtnl_link_stats64 */
memset((char *)stats64 + n * sizeof(u64), 0,
sizeof(*stats64) - n * sizeof(u64));
-#endif
}
EXPORT_SYMBOL(netdev_stats_to_stats64);
