netdev - [PATCH net-next 13/19] net: dev: use kfree_skb_reason() for sch_handle

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Date:   Tue, 15 Feb 2022 19:28:06 +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 13/19] net: dev: use kfree_skb_reason() for sch_handle_egress()

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

Replace kfree_skb() used in sch_handle_egress() with kfree_skb_reason().
The drop reason SKB_DROP_REASON_QDISC_EGRESS is introduced. Considering
the code path of qdisc egress, we make it distinct with the drop reason
of SKB_DROP_REASON_QDISC_DROP in the next commit.

Signed-off-by: Menglong Dong <imagedong@...cent.com>
---
 include/linux/skbuff.h     | 4 ++++
 include/trace/events/skb.h | 1 +
 net/core/dev.c             | 2 +-
 3 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 136af29be256..9e19806d9818 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -396,6 +396,10 @@ enum skb_drop_reason {
 						 * full, and the skbs on the
 						 * tail will be dropped
 						 */
+	SKB_DROP_REASON_QDISC_EGRESS,	/* qdisc of type egress check
+					 * failed (maybe an eBPF program
+					 * is tricking?)
+					 */
 	SKB_DROP_REASON_MAX,
 };
 
diff --git a/include/trace/events/skb.h b/include/trace/events/skb.h
index dd06366ded4a..a79b64eace9e 100644
--- a/include/trace/events/skb.h
+++ b/include/trace/events/skb.h
@@ -43,6 +43,7 @@
 	EM(SKB_DROP_REASON_IPV6DSIABLED, IPV6DSIABLED)		\
 	EM(SKB_DROP_REASON_NEIGH_FAILED, NEIGH_FAILED)		\
 	EM(SKB_DROP_REASON_NEIGH_QUEUEFULL, NEIGH_QUEUEFULL)	\
+	EM(SKB_DROP_REASON_QDISC_EGRESS, QDISC_EGRESS)		\
 	EMe(SKB_DROP_REASON_MAX, MAX)
 
 #undef EM
diff --git a/net/core/dev.c b/net/core/dev.c
index 2c3b8744e00c..2a7b7c1b855a 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -3840,7 +3840,7 @@ sch_handle_egress(struct sk_buff *skb, int *ret, struct net_device *dev)
 	case TC_ACT_SHOT:
 		mini_qdisc_qstats_cpu_drop(miniq);
 		*ret = NET_XMIT_DROP;
-		kfree_skb(skb);
+		kfree_skb_reason(skb, SKB_DROP_REASON_QDISC_EGRESS);
 		return NULL;
 	case TC_ACT_STOLEN:
 	case TC_ACT_QUEUED:
-- 
2.34.1