netdev - [PATCH net-next 01/19] net: tcp: introduce tcp_drop

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Message-Id: <20220215112812.2093852-2-imagedong@tencent.com>
Date:   Tue, 15 Feb 2022 19:27:54 +0800
From:   menglong8.dong@...il.com
To:     dsahern@...nel.org, kuba@...nel.org
Cc:     edumazet@...gle.com, davem@...emloft.net, rostedt@...dmis.org,
        mingo@...hat.com, yoshfuji@...ux-ipv6.org, ast@...nel.org,
        daniel@...earbox.net, hawk@...nel.org, john.fastabend@...il.com,
        imagedong@...cent.com, talalahmad@...gle.com,
        keescook@...omium.org, ilias.apalodimas@...aro.org, alobakin@...me,
        memxor@...il.com, atenart@...nel.org, bigeasy@...utronix.de,
        pabeni@...hat.com, linyunsheng@...wei.com, arnd@...db.de,
        yajun.deng@...ux.dev, roopa@...dia.com, willemb@...gle.com,
        vvs@...tuozzo.com, cong.wang@...edance.com,
        luiz.von.dentz@...el.com, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, bpf@...r.kernel.org, flyingpeng@...cent.com
Subject: [PATCH net-next 01/19] net: tcp: introduce tcp_drop_reason()

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

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 collect drop
reasons, introduce the function tcp_drop_reason().

tcp_drop_reason() will finally call kfree_skb_reason() and pass the
drop reason to 'kfree_skb' tracepoint.

PS: __kfree_skb() was used in tcp_drop(), I'm not sure if it's ok
to replace it with kfree_skb_reason().

Signed-off-by: Menglong Dong <imagedong@...cent.com>
---
 net/ipv4/tcp_input.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index af94a6d22a9d..e3811afd1756 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -4684,10 +4684,19 @@ 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);
+	/* why __kfree_skb() used here before, other than kfree_skb()?
+	 * confusing......
+	 */
+	kfree_skb_reason(skb, reason);
+}
+
+static inline 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
-- 
2.34.1