netdev - [PATCH net-next 1/2] net: skb: introduce SKB_DR_MAX

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Message-Id: <20220208072836.3540192-2-imagedong@tencent.com>
Date:   Tue,  8 Feb 2022 15:28:35 +0800
From:   menglong8.dong@...il.com
To:     rostedt@...dmis.org, idosch@...sch.org
Cc:     mingo@...hat.com, nhorman@...driver.com, davem@...emloft.net,
        kuba@...nel.org, imagedong@...cent.com, dsahern@...nel.org,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: [PATCH net-next 1/2] net: skb: introduce SKB_DR_MAX_LEN

From: Menglong Dong <imagedong@...cent.com>

Introduce 'SKB_DR_MAX_LEN' to define the max length of drop reasons.
32 should be enough, as the current longest reason is
'UNICAST_IN_L2_MULTICAST'.

Signed-off-by: Menglong Dong <imagedong@...cent.com>
---
 include/trace/events/skb.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/include/trace/events/skb.h b/include/trace/events/skb.h
index cfcfd26399f7..920adcd564bc 100644
--- a/include/trace/events/skb.h
+++ b/include/trace/events/skb.h
@@ -9,6 +9,11 @@
 #include <linux/netdevice.h>
 #include <linux/tracepoint.h>
 
+/* max string length of drop reason. We use 'SKB_DR_' as the prefix to
+ * make it distinct from 'enum skb_drop_reason'
+ */
+#define SKB_DR_MAX_LEN	32
+
 #define TRACE_SKB_DROP_REASON					\
 	EM(SKB_DROP_REASON_NOT_SPECIFIED, NOT_SPECIFIED)	\
 	EM(SKB_DROP_REASON_NO_SOCKET, NO_SOCKET)		\
-- 
2.34.1