[Devel] [PATCH 21/47] net: dev: use kfree_skb_reason() for sch_handle_egress()

[Nikolay Borisov]

From: Menglong Dong <imagedong at tencent.com>

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

Signed-off-by: Menglong Dong <imagedong at tencent.com>
Signed-off-by: David S. Miller <davem at davemloft.net>
Acked-by: Nikolay Borisov <nborisov at suse.com>
Signed-off-by: Nikolay Borisov <nikolay.borisov at virtuozzo.com>
---
 include/linux/skbuff.h     | 1 +
 include/trace/events/skb.h | 1 +
 net/core/dev.c             | 2 +-
 3 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index df1c8c5110ed..fbe1cadf1771 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -392,6 +392,7 @@ enum skb_drop_reason {
 						 * entry is full
 						 */
 	SKB_DROP_REASON_NEIGH_DEAD,     /* neigh entry is dead */
+	SKB_DROP_REASON_TC_EGRESS,      /* dropped in TC egress HOOK */
 	SKB_DROP_REASON_MAX,
 };
 
diff --git a/include/trace/events/skb.h b/include/trace/events/skb.h
index 005ad4a645e1..8141102d3735 100644
--- a/include/trace/events/skb.h
+++ b/include/trace/events/skb.h
@@ -45,6 +45,7 @@
 	EM(SKB_DROP_REASON_NEIGH_FAILED, NEIGH_FAILED)          \
 	EM(SKB_DROP_REASON_NEIGH_QUEUEFULL, NEIGH_QUEUEFULL)    \
 	EM(SKB_DROP_REASON_NEIGH_DEAD, NEIGH_DEAD)              \
+	EM(SKB_DROP_REASON_TC_EGRESS, TC_EGRESS)		\
 	EMe(SKB_DROP_REASON_MAX, MAX)
 
 #undef EM
diff --git a/net/core/dev.c b/net/core/dev.c
index c064543c372f..265bae952468 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -3882,7 +3882,7 @@ 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_TC_EGRESS);
 		return NULL;
 	case TC_ACT_STOLEN:
 	case TC_ACT_QUEUED:
-- 
2.34.1