netdev - [PATCH net-next v2 3/7] net: dev: add skb drop reasons to __dev_xmit

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Date:   Fri,  4 Mar 2022 14:00:42 +0800
From:   menglong8.dong@...il.com
To:     dsahern@...nel.org, kuba@...nel.org
Cc:     rostedt@...dmis.org, mingo@...hat.com, davem@...emloft.net,
        ast@...nel.org, daniel@...earbox.net, hawk@...nel.org,
        john.fastabend@...il.com, imagedong@...cent.com,
        edumazet@...gle.com, talalahmad@...gle.com, keescook@...omium.org,
        ilias.apalodimas@...aro.org, alobakin@...me,
        flyingpeng@...cent.com, mengensun@...cent.com, atenart@...nel.org,
        bigeasy@...utronix.de, memxor@...il.com, arnd@...db.de,
        pabeni@...hat.com, willemb@...gle.com, vvs@...tuozzo.com,
        cong.wang@...edance.com, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, bpf@...r.kernel.org
Subject: [PATCH net-next v2 3/7] net: dev: add skb drop reasons to __dev_xmit_skb()

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

Add reasons for skb drops to __dev_xmit_skb() by replacing
kfree_skb_list() with kfree_skb_list_reason(). The drop reason of
SKB_DROP_REASON_QDISC_DROP is introduced for qdisc enqueue fails.

Signed-off-by: Menglong Dong <imagedong@...cent.com>
---
 include/linux/skbuff.h     | 4 ++++
 include/trace/events/skb.h | 1 +
 net/core/dev.c             | 5 +++--
 3 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 9d219e266dc7..a3d65e749ea3 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -395,6 +395,10 @@ enum skb_drop_reason {
 						 */
 	SKB_DROP_REASON_NEIGH_DEAD,	/* neigh entry is dead */
 	SKB_DROP_REASON_TC_EGRESS,	/* dropped in TC egress HOOK */
+	SKB_DROP_REASON_QDISC_DROP,	/* dropped by qdisc when packet
+					 * outputting (failed to enqueue to
+					 * current qdisc)
+					 */
 	SKB_DROP_REASON_MAX,
 };
 
diff --git a/include/trace/events/skb.h b/include/trace/events/skb.h
index 53755e8191a1..dbf3e2e3c1b4 100644
--- a/include/trace/events/skb.h
+++ b/include/trace/events/skb.h
@@ -46,6 +46,7 @@
 	EM(SKB_DROP_REASON_NEIGH_QUEUEFULL, NEIGH_QUEUEFULL)	\
 	EM(SKB_DROP_REASON_NEIGH_DEAD, NEIGH_DEAD)		\
 	EM(SKB_DROP_REASON_TC_EGRESS, TC_EGRESS)		\
+	EM(SKB_DROP_REASON_QDISC_DROP, QDISC_DROP)		\
 	EMe(SKB_DROP_REASON_MAX, MAX)
 
 #undef EM
diff --git a/net/core/dev.c b/net/core/dev.c
index 353322e72a61..2ba331b5b775 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -3730,7 +3730,8 @@ static inline int __dev_xmit_skb(struct sk_buff *skb, struct Qdisc *q,
 
 no_lock_out:
 		if (unlikely(to_free))
-			kfree_skb_list(to_free);
+			kfree_skb_list_reason(to_free,
+					      SKB_DROP_REASON_QDISC_DROP);
 		return rc;
 	}
 
@@ -3785,7 +3786,7 @@ static inline int __dev_xmit_skb(struct sk_buff *skb, struct Qdisc *q,
 	}
 	spin_unlock(root_lock);
 	if (unlikely(to_free))
-		kfree_skb_list(to_free);
+		kfree_skb_list_reason(to_free, SKB_DROP_REASON_QDISC_DROP);
 	if (unlikely(contended))
 		spin_unlock(&q->busylock);
 	return rc;
-- 
2.35.1