netdev - [PATCH net-next 1/9] skb: add some helpers for skb drop reasons

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Date:   Wed, 13 Apr 2022 16:15:52 +0800
From:   menglong8.dong@...il.com
To:     dsahern@...nel.org
Cc:     rostedt@...dmis.org, mingo@...hat.com, davem@...emloft.net,
        yoshfuji@...ux-ipv6.org, kuba@...nel.org, pabeni@...hat.com,
        benbjiang@...cent.com, flyingpeng@...cent.com,
        imagedong@...cent.com, edumazet@...gle.com, kafai@...com,
        talalahmad@...gle.com, keescook@...omium.org,
        mengensun@...cent.com, dongli.zhang@...cle.com,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: [PATCH net-next 1/9] skb: add some helpers for skb drop reasons

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

In order to simply the definition and assignment for
'enum skb_drop_reason', introduce some helpers.

SKB_DR() is used to define a variable of type 'enum skb_drop_reason'
with the 'SKB_DROP_REASON_NOT_SPECIFIED' initial value.

SKB_DR_SET() is used to set the value of the variable. Seems it is
a little useless? But it makes the code shorter.

SKB_DR_OR() is used to set the value of the variable if it is not set
yet, which means its value is SKB_DROP_REASON_NOT_SPECIFIED.

Signed-off-by: Menglong Dong <imagedong@...cent.com>
Reviewed-by: Jiang Biao <benbjiang@...cent.com>
Reviewed-by: Hao Peng <flyingpeng@...cent.com>
---
 include/linux/skbuff.h | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 9b81ba497665..0cbd6ada957c 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -450,6 +450,18 @@ enum skb_drop_reason {
 	SKB_DROP_REASON_MAX,
 };
 
+#define SKB_DR_INIT(name, reason)				\
+	enum skb_drop_reason name = SKB_DROP_REASON_##reason
+#define SKB_DR(name)						\
+	SKB_DR_INIT(name, NOT_SPECIFIED)
+#define SKB_DR_SET(name, reason)				\
+	(name = SKB_DROP_REASON_##reason)
+#define SKB_DR_OR(name, reason)					\
+	do {							\
+		if (name == SKB_DROP_REASON_NOT_SPECIFIED)	\
+			SKB_DR_SET(name, reason);		\
+	} while (0)
+
 /* To allow 64K frame to be packed as single skb without frag_list we
  * require 64K/PAGE_SIZE pages plus 1 additional page to allow for
  * buffers which do not start on a page boundary.
-- 
2.35.1