netdev - [PATCH v2 net-next 9/9] team: adopt u64_stats

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Date:   Wed,  8 Jun 2022 08:46:40 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Cc:     netdev <netdev@...r.kernel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Eric Dumazet <eric.dumazet@...il.com>
Subject: [PATCH v2 net-next 9/9] team: adopt u64_stats_t

From: Eric Dumazet <edumazet@...gle.com>

As explained in commit 316580b69d0a ("u64_stats: provide u64_stats_t type")
we should use u64_stats_t and related accessors to avoid load/store tearing.

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
 drivers/net/team/team.c | 26 +++++++++++++-------------
 include/linux/if_team.h | 10 +++++-----
 2 files changed, 18 insertions(+), 18 deletions(-)

diff --git a/drivers/net/team/team.c b/drivers/net/team/team.c
index b07dde6f0abf273195ff0f60217bd7158535b153..aac133a1e27a5f64fe8f83a456aa0598fad6824c 100644
--- a/drivers/net/team/team.c
+++ b/drivers/net/team/team.c
@@ -749,10 +749,10 @@ static rx_handler_result_t team_handle_frame(struct sk_buff **pskb)
 
 		pcpu_stats = this_cpu_ptr(team->pcpu_stats);
 		u64_stats_update_begin(&pcpu_stats->syncp);
-		pcpu_stats->rx_packets++;
-		pcpu_stats->rx_bytes += skb->len;
+		u64_stats_inc(&pcpu_stats->rx_packets);
+		u64_stats_add(&pcpu_stats->rx_bytes, skb->len);
 		if (skb->pkt_type == PACKET_MULTICAST)
-			pcpu_stats->rx_multicast++;
+			u64_stats_inc(&pcpu_stats->rx_multicast);
 		u64_stats_update_end(&pcpu_stats->syncp);
 
 		skb->dev = team->dev;
@@ -1720,8 +1720,8 @@ static netdev_tx_t team_xmit(struct sk_buff *skb, struct net_device *dev)
 
 		pcpu_stats = this_cpu_ptr(team->pcpu_stats);
 		u64_stats_update_begin(&pcpu_stats->syncp);
-		pcpu_stats->tx_packets++;
-		pcpu_stats->tx_bytes += len;
+		u64_stats_inc(&pcpu_stats->tx_packets);
+		u64_stats_add(&pcpu_stats->tx_bytes, len);
 		u64_stats_update_end(&pcpu_stats->syncp);
 	} else {
 		this_cpu_inc(team->pcpu_stats->tx_dropped);
@@ -1854,11 +1854,11 @@ team_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
 		p = per_cpu_ptr(team->pcpu_stats, i);
 		do {
 			start = u64_stats_fetch_begin_irq(&p->syncp);
-			rx_packets	= p->rx_packets;
-			rx_bytes	= p->rx_bytes;
-			rx_multicast	= p->rx_multicast;
-			tx_packets	= p->tx_packets;
-			tx_bytes	= p->tx_bytes;
+			rx_packets	= u64_stats_read(&p->rx_packets);
+			rx_bytes	= u64_stats_read(&p->rx_bytes);
+			rx_multicast	= u64_stats_read(&p->rx_multicast);
+			tx_packets	= u64_stats_read(&p->tx_packets);
+			tx_bytes	= u64_stats_read(&p->tx_bytes);
 		} while (u64_stats_fetch_retry_irq(&p->syncp, start));
 
 		stats->rx_packets	+= rx_packets;
@@ -1870,9 +1870,9 @@ team_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
 		 * rx_dropped, tx_dropped & rx_nohandler are u32,
 		 * updated without syncp protection.
 		 */
-		rx_dropped	+= p->rx_dropped;
-		tx_dropped	+= p->tx_dropped;
-		rx_nohandler	+= p->rx_nohandler;
+		rx_dropped	+= READ_ONCE(p->rx_dropped);
+		tx_dropped	+= READ_ONCE(p->tx_dropped);
+		rx_nohandler	+= READ_ONCE(p->rx_nohandler);
 	}
 	stats->rx_dropped	= rx_dropped;
 	stats->tx_dropped	= tx_dropped;
diff --git a/include/linux/if_team.h b/include/linux/if_team.h
index add607943c9564365e8d72d7522291d7a3d899d2..fc985e5c739d434148e8ff19d30ebc3ee8abf1d8 100644
--- a/include/linux/if_team.h
+++ b/include/linux/if_team.h
@@ -12,11 +12,11 @@
 #include <uapi/linux/if_team.h>
 
 struct team_pcpu_stats {
-	u64			rx_packets;
-	u64			rx_bytes;
-	u64			rx_multicast;
-	u64			tx_packets;
-	u64			tx_bytes;
+	u64_stats_t		rx_packets;
+	u64_stats_t		rx_bytes;
+	u64_stats_t		rx_multicast;
+	u64_stats_t		tx_packets;
+	u64_stats_t		tx_bytes;
 	struct u64_stats_sync	syncp;
 	u32			rx_dropped;
 	u32			tx_dropped;
-- 
2.36.1.255.ge46751e96f-goog