devlink: adopt u64_stats_t

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@google.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/net/core/devlink.c b/net/core/devlink.c
index 5cc8849..db61f3a 100644 (file)
--- a/net/core/devlink.c
+++ b/net/core/devlink.c
@@ -7946,8 +7946,8 @@ static int devlink_nl_cmd_health_reporter_test_doit(struct sk_buff *skb,
 }
 
 struct devlink_stats {
-       u64 rx_bytes;
-       u64 rx_packets;
+       u64_stats_t rx_bytes;
+       u64_stats_t rx_packets;
        struct u64_stats_sync syncp;
 };
 
@@ -8104,12 +8104,12 @@ static void devlink_trap_stats_read(struct devlink_stats __percpu *trap_stats,
                cpu_stats = per_cpu_ptr(trap_stats, i);
                do {
                        start = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
-                       rx_packets = cpu_stats->rx_packets;
-                       rx_bytes = cpu_stats->rx_bytes;
+                       rx_packets = u64_stats_read(&cpu_stats->rx_packets);
+                       rx_bytes = u64_stats_read(&cpu_stats->rx_bytes);
                } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, start));
 
-               stats->rx_packets += rx_packets;
-               stats->rx_bytes += rx_bytes;
+               u64_stats_add(&stats->rx_packets, rx_packets);
+               u64_stats_add(&stats->rx_bytes, rx_bytes);
        }
 }
 
@@ -8127,11 +8127,13 @@ devlink_trap_group_stats_put(struct sk_buff *msg,
                return -EMSGSIZE;
 
        if (nla_put_u64_64bit(msg, DEVLINK_ATTR_STATS_RX_PACKETS,
-                             stats.rx_packets, DEVLINK_ATTR_PAD))
+                             u64_stats_read(&stats.rx_packets),
+                             DEVLINK_ATTR_PAD))
                goto nla_put_failure;
 
        if (nla_put_u64_64bit(msg, DEVLINK_ATTR_STATS_RX_BYTES,
-                             stats.rx_bytes, DEVLINK_ATTR_PAD))
+                             u64_stats_read(&stats.rx_bytes),
+                             DEVLINK_ATTR_PAD))
                goto nla_put_failure;
 
        nla_nest_end(msg, attr);
@@ -8171,11 +8173,13 @@ static int devlink_trap_stats_put(struct sk_buff *msg, struct devlink *devlink,
                goto nla_put_failure;
 
        if (nla_put_u64_64bit(msg, DEVLINK_ATTR_STATS_RX_PACKETS,
-                             stats.rx_packets, DEVLINK_ATTR_PAD))
+                             u64_stats_read(&stats.rx_packets),
+                             DEVLINK_ATTR_PAD))
                goto nla_put_failure;
 
        if (nla_put_u64_64bit(msg, DEVLINK_ATTR_STATS_RX_BYTES,
-                             stats.rx_bytes, DEVLINK_ATTR_PAD))
+                             u64_stats_read(&stats.rx_bytes),
+                             DEVLINK_ATTR_PAD))
                goto nla_put_failure;
 
        nla_nest_end(msg, attr);
@@ -11641,8 +11645,8 @@ devlink_trap_stats_update(struct devlink_stats __percpu *trap_stats,
 
        stats = this_cpu_ptr(trap_stats);
        u64_stats_update_begin(&stats->syncp);
-       stats->rx_bytes += skb_len;
-       stats->rx_packets++;
+       u64_stats_add(&stats->rx_bytes, skb_len);
+       u64_stats_inc(&stats->rx_packets);
        u64_stats_update_end(&stats->syncp);
 }