netdev - [PATCH net-next v3 2/2] net: update netdev_rx_csum

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Date:   Mon, 28 Jun 2021 09:50:07 -0400
From:   Tanner Love <tannerlove.kernel@...il.com>
To:     netdev@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Mahesh Bandewar <maheshb@...gle.com>,
        "Darrick J . Wong" <djwong@...nel.org>,
        Arnd Bergmann <arnd@...db.de>, Petr Mladek <pmladek@...e.com>,
        Sergey Senozhatsky <senozhatsky@...omium.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        John Ogness <john.ogness@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Andrii Nakryiko <andriin@...com>,
        Antoine Tenart <atenart@...nel.org>,
        Alexander Lobakin <alobakin@...me>,
        Wei Wang <weiwan@...gle.com>, Taehee Yoo <ap420073@...il.com>,
        Yunsheng Lin <linyunsheng@...wei.com>,
        Willem de Bruijn <willemb@...gle.com>,
        Tanner Love <tannerlove@...gle.com>
Subject: [PATCH net-next v3 2/2] net: update netdev_rx_csum_fault() print dump only once

From: Tanner Love <tannerlove@...gle.com>

Printing this stack dump multiple times does not provide additional
useful information, and consumes time in the data path. Printing once
is sufficient.

Changes
  v2: Format indentation properly

Signed-off-by: Tanner Love <tannerlove@...gle.com>
Acked-by: Eric Dumazet <edumazet@...gle.com>
Acked-by: Mahesh Bandewar <maheshb@...gle.com>
---
 net/core/dev.c | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/net/core/dev.c b/net/core/dev.c
index 991d09b67bd9..d609366da95c 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -148,6 +148,7 @@
 #include <net/devlink.h>
 #include <linux/pm_runtime.h>
 #include <linux/prandom.h>
+#include <linux/once_lite.h>
 
 #include "net-sysfs.h"
 
@@ -3487,13 +3488,16 @@ EXPORT_SYMBOL(__skb_gso_segment);
 
 /* Take action when hardware reception checksum errors are detected. */
 #ifdef CONFIG_BUG
+static void do_netdev_rx_csum_fault(struct net_device *dev, struct sk_buff *skb)
+{
+	pr_err("%s: hw csum failure\n", dev ? dev->name : "<unknown>");
+	skb_dump(KERN_ERR, skb, true);
+	dump_stack();
+}
+
 void netdev_rx_csum_fault(struct net_device *dev, struct sk_buff *skb)
 {
-	if (net_ratelimit()) {
-		pr_err("%s: hw csum failure\n", dev ? dev->name : "<unknown>");
-		skb_dump(KERN_ERR, skb, true);
-		dump_stack();
-	}
+	DO_ONCE_LITE(do_netdev_rx_csum_fault, dev, skb);
 }
 EXPORT_SYMBOL(netdev_rx_csum_fault);
 #endif
-- 
2.32.0.93.g670b81a890-goog