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Date:   Sun, 20 Feb 2022 15:06:29 +0800
Subject: [PATCH net-next v3 1/9] net: tcp: introduce tcp_drop_reason()

From: Menglong Dong <>

For TCP protocol, tcp_drop() is used to free the skb when it needs
to be dropped. To make use of kfree_skb_reason() and pass the drop
reason to it, introduce the function tcp_drop_reason(). Meanwhile,
make tcp_drop() an inline call to tcp_drop_reason().

Reviewed-by: Mengen Sun <>
Reviewed-by: Hao Peng <>
Signed-off-by: Menglong Dong <>
Reviewed-by: Eric Dumazet <>
Reviewed-by: David Ahern <>
- remove the 'inline' of tcp_drop()
 net/ipv4/tcp_input.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index af94a6d22a9d..2bcbefa4322a 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -4684,10 +4684,16 @@ static bool tcp_ooo_try_coalesce(struct sock *sk,
 	return res;
-static void tcp_drop(struct sock *sk, struct sk_buff *skb)
+static void tcp_drop_reason(struct sock *sk, struct sk_buff *skb,
+			    enum skb_drop_reason reason)
 	sk_drops_add(sk, skb);
-	__kfree_skb(skb);
+	kfree_skb_reason(skb, reason);
+static void tcp_drop(struct sock *sk, struct sk_buff *skb)
+	tcp_drop_reason(sk, skb, SKB_DROP_REASON_NOT_SPECIFIED);
 /* This one checks to see if we can put data from the

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