netdev - [PATCH v2 net-next 2/9] ipvlan: adopt u64_stats

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Date:   Wed,  8 Jun 2022 08:46:33 -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 2/9] ipvlan: 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.

Add READ_ONCE() when reading rx_errs & tx_drps.

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
 drivers/net/ipvlan/ipvlan.h      | 10 +++++-----
 drivers/net/ipvlan/ipvlan_core.c |  6 +++---
 drivers/net/ipvlan/ipvlan_main.c | 18 +++++++++---------
 3 files changed, 17 insertions(+), 17 deletions(-)

diff --git a/drivers/net/ipvlan/ipvlan.h b/drivers/net/ipvlan/ipvlan.h
index 3837c897832eaf6c325f06f86f16edf18775956a..de94921cbef9f2beb2b7e4f5ecde06eb4e5cff9c 100644
--- a/drivers/net/ipvlan/ipvlan.h
+++ b/drivers/net/ipvlan/ipvlan.h
@@ -47,11 +47,11 @@ typedef enum {
 } ipvl_hdr_type;
 
 struct ipvl_pcpu_stats {
-	u64			rx_pkts;
-	u64			rx_bytes;
-	u64			rx_mcast;
-	u64			tx_pkts;
-	u64			tx_bytes;
+	u64_stats_t		rx_pkts;
+	u64_stats_t		rx_bytes;
+	u64_stats_t		rx_mcast;
+	u64_stats_t		tx_pkts;
+	u64_stats_t		tx_bytes;
 	struct u64_stats_sync	syncp;
 	u32			rx_errs;
 	u32			tx_drps;
diff --git a/drivers/net/ipvlan/ipvlan_core.c b/drivers/net/ipvlan/ipvlan_core.c
index 6ffb27419e64b36666d395da924304a943343640..dfeb5b392e642885c3897018337f94fb41d10eab 100644
--- a/drivers/net/ipvlan/ipvlan_core.c
+++ b/drivers/net/ipvlan/ipvlan_core.c
@@ -19,10 +19,10 @@ void ipvlan_count_rx(const struct ipvl_dev *ipvlan,
 
 		pcptr = this_cpu_ptr(ipvlan->pcpu_stats);
 		u64_stats_update_begin(&pcptr->syncp);
-		pcptr->rx_pkts++;
-		pcptr->rx_bytes += len;
+		u64_stats_inc(&pcptr->rx_pkts);
+		u64_stats_add(&pcptr->rx_bytes, len);
 		if (mcast)
-			pcptr->rx_mcast++;
+			u64_stats_inc(&pcptr->rx_mcast);
 		u64_stats_update_end(&pcptr->syncp);
 	} else {
 		this_cpu_inc(ipvlan->pcpu_stats->rx_errs);
diff --git a/drivers/net/ipvlan/ipvlan_main.c b/drivers/net/ipvlan/ipvlan_main.c
index aa28a29e228c0f3337b6c32d89d525e55a2c2021..49ba8a50dfb1e169beb137296fb3d3c1cfde4c19 100644
--- a/drivers/net/ipvlan/ipvlan_main.c
+++ b/drivers/net/ipvlan/ipvlan_main.c
@@ -224,8 +224,8 @@ static netdev_tx_t ipvlan_start_xmit(struct sk_buff *skb,
 		pcptr = this_cpu_ptr(ipvlan->pcpu_stats);
 
 		u64_stats_update_begin(&pcptr->syncp);
-		pcptr->tx_pkts++;
-		pcptr->tx_bytes += skblen;
+		u64_stats_inc(&pcptr->tx_pkts);
+		u64_stats_add(&pcptr->tx_bytes, skblen);
 		u64_stats_update_end(&pcptr->syncp);
 	} else {
 		this_cpu_inc(ipvlan->pcpu_stats->tx_drps);
@@ -300,11 +300,11 @@ static void ipvlan_get_stats64(struct net_device *dev,
 			pcptr = per_cpu_ptr(ipvlan->pcpu_stats, idx);
 			do {
 				strt= u64_stats_fetch_begin_irq(&pcptr->syncp);
-				rx_pkts = pcptr->rx_pkts;
-				rx_bytes = pcptr->rx_bytes;
-				rx_mcast = pcptr->rx_mcast;
-				tx_pkts = pcptr->tx_pkts;
-				tx_bytes = pcptr->tx_bytes;
+				rx_pkts = u64_stats_read(&pcptr->rx_pkts);
+				rx_bytes = u64_stats_read(&pcptr->rx_bytes);
+				rx_mcast = u64_stats_read(&pcptr->rx_mcast);
+				tx_pkts = u64_stats_read(&pcptr->tx_pkts);
+				tx_bytes = u64_stats_read(&pcptr->tx_bytes);
 			} while (u64_stats_fetch_retry_irq(&pcptr->syncp,
 							   strt));
 
@@ -315,8 +315,8 @@ static void ipvlan_get_stats64(struct net_device *dev,
 			s->tx_bytes += tx_bytes;
 
 			/* u32 values are updated without syncp protection. */
-			rx_errs += pcptr->rx_errs;
-			tx_drps += pcptr->tx_drps;
+			rx_errs += READ_ONCE(pcptr->rx_errs);
+			tx_drps += READ_ONCE(pcptr->tx_drps);
 		}
 		s->rx_errors = rx_errs;
 		s->rx_dropped = rx_errs;
-- 
2.36.1.255.ge46751e96f-goog