diff mbox series

[v2,net-next,7/9] devlink: adopt u64_stats_t

Message ID 20220608154640.1235958-8-eric.dumazet@gmail.com (mailing list archive)
State Accepted
Commit 958751e0807d5b2316cc4c7c2834ba9a0fe1b9e8
Delegated to: Netdev Maintainers
Headers show
Series net: adopt u64_stats_t type | expand

Checks

Context Check Description
netdev/tree_selection success Clearly marked for net-next, async
netdev/fixes_present success Fixes tag not required for -next series
netdev/subject_prefix success Link
netdev/cover_letter success Series has a cover letter
netdev/patch_count success Link
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 2 this patch: 2
netdev/cc_maintainers warning 1 maintainers not CCed: jiri@nvidia.com
netdev/build_clang success Errors and warnings before: 6 this patch: 6
netdev/module_param success Was 0 now: 0
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 2 this patch: 2
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 66 lines checked
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0

Commit Message

Eric Dumazet June 8, 2022, 3:46 p.m. UTC 
From: Eric Dumazet <edumazet@google.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@google.com>
---
 net/core/devlink.c | 28 ++++++++++++++++------------
 1 file changed, 16 insertions(+), 12 deletions(-)
diff mbox series

Patch

diff --git a/net/core/devlink.c b/net/core/devlink.c
index 5cc88490f18fd24329df0a83a425ed680b7a10fb..db61f3a341cb24b4de79198db7ae11b5e3132d42 100644
--- 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);
 }