From 7a26dc9e7b43f5a24c4b843713e728582adf1c38 Mon Sep 17 00:00:00 2001
From: Menglong Dong <imagedong@tencent.com>
Date: Sun, 20 Feb 2022 15:06:33 +0800
Subject: net: tcp: add skb drop reasons to tcp_add_backlog()

Pass the address of drop_reason to tcp_add_backlog() to store the
reasons for skb drops when fails. Following drop reasons are
introduced:

SKB_DROP_REASON_SOCKET_BACKLOG

Reviewed-by: Mengen Sun <mengensun@tencent.com>
Reviewed-by: Hao Peng <flyingpeng@tencent.com>
Signed-off-by: Menglong Dong <imagedong@tencent.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
 include/linux/skbuff.h | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'include/linux/skbuff.h')

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 46678eb587ff..f7f33c79945b 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -358,6 +358,10 @@ enum skb_drop_reason {
 					 * corresponding to
 					 * LINUX_MIB_TCPMD5FAILURE
 					 */
+	SKB_DROP_REASON_SOCKET_BACKLOG,	/* failed to add skb to socket
+					 * backlog (see
+					 * LINUX_MIB_TCPBACKLOGDROP)
+					 */
 	SKB_DROP_REASON_MAX,
 };
 
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