netdev - [PATCH net-next v4 09/12] net: vxlan: add drop reasons support to vxlan_xmit

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Message-Id: <20241001073225.807419-10-dongml2@chinatelecom.cn>
Date: Tue,  1 Oct 2024 15:32:22 +0800
From: Menglong Dong <menglong8.dong@...il.com>
To: idosch@...dia.com,
	kuba@...nel.org,
	aleksander.lobakin@...el.com,
	horms@...nel.org
Cc: davem@...emloft.net,
	edumazet@...gle.com,
	pabeni@...hat.com,
	dsahern@...nel.org,
	dongml2@...natelecom.cn,
	amcohen@...dia.com,
	gnault@...hat.com,
	bpoirier@...dia.com,
	b.galvani@...il.com,
	razor@...ckwall.org,
	petrm@...dia.com,
	linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org
Subject: [PATCH net-next v4 09/12] net: vxlan: add drop reasons support to vxlan_xmit_one()

Replace kfree_skb/dev_kfree_skb with kfree_skb_reason in vxlan_xmit_one.
No drop reasons are introduced in this commit.

The only concern of mine is replacing dev_kfree_skb with
kfree_skb_reason. The dev_kfree_skb is equal to consume_skb, and I'm not
sure if we can change it to kfree_skb here. In my option, the skb is
"dropped" here, isn't it?

Signed-off-by: Menglong Dong <dongml2@...natelecom.cn>
---
 drivers/net/vxlan/vxlan_core.c | 19 ++++++++++++++-----
 1 file changed, 14 insertions(+), 5 deletions(-)

diff --git a/drivers/net/vxlan/vxlan_core.c b/drivers/net/vxlan/vxlan_core.c
index 3dc77d08500a..3da3ea27d3af 100644
--- a/drivers/net/vxlan/vxlan_core.c
+++ b/drivers/net/vxlan/vxlan_core.c
@@ -2374,13 +2374,16 @@ void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
 	bool use_cache;
 	bool udp_sum = false;
 	bool xnet = !net_eq(vxlan->net, dev_net(vxlan->dev));
+	enum skb_drop_reason reason;
 	bool no_eth_encap;
 	__be32 vni = 0;
 
 	no_eth_encap = flags & VXLAN_F_GPE && skb->protocol != htons(ETH_P_TEB);
-	if (!skb_vlan_inet_prepare(skb, no_eth_encap))
+	reason = skb_vlan_inet_prepare_reason(skb, no_eth_encap);
+	if (reason)
 		goto drop;
 
+	reason = SKB_DROP_REASON_NOT_SPECIFIED;
 	old_iph = ip_hdr(skb);
 
 	info = skb_tunnel_info(skb);
@@ -2484,6 +2487,7 @@ void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
 					   tos, use_cache ? dst_cache : NULL);
 		if (IS_ERR(rt)) {
 			err = PTR_ERR(rt);
+			reason = SKB_DROP_REASON_IP_OUTNOROUTES;
 			goto tx_error;
 		}
 
@@ -2535,8 +2539,10 @@ void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
 		ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
 		err = vxlan_build_skb(skb, ndst, sizeof(struct iphdr),
 				      vni, md, flags, udp_sum);
-		if (err < 0)
+		if (err < 0) {
+			reason = SKB_DROP_REASON_NOMEM;
 			goto tx_error;
+		}
 
 		udp_tunnel_xmit_skb(rt, sock4->sock->sk, skb, saddr,
 				    pkey->u.ipv4.dst, tos, ttl, df,
@@ -2556,6 +2562,7 @@ void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
 		if (IS_ERR(ndst)) {
 			err = PTR_ERR(ndst);
 			ndst = NULL;
+			reason = SKB_DROP_REASON_IP_OUTNOROUTES;
 			goto tx_error;
 		}
 
@@ -2596,8 +2603,10 @@ void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
 		skb_scrub_packet(skb, xnet);
 		err = vxlan_build_skb(skb, ndst, sizeof(struct ipv6hdr),
 				      vni, md, flags, udp_sum);
-		if (err < 0)
+		if (err < 0) {
+			reason = SKB_DROP_REASON_NOMEM;
 			goto tx_error;
+		}
 
 		udp_tunnel6_xmit_skb(ndst, sock6->sock->sk, skb, dev,
 				     &saddr, &pkey->u.ipv6.dst, tos, ttl,
@@ -2612,7 +2621,7 @@ void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
 drop:
 	dev_core_stats_tx_dropped_inc(dev);
 	vxlan_vnifilter_count(vxlan, vni, NULL, VXLAN_VNI_STATS_TX_DROPS, 0);
-	dev_kfree_skb(skb);
+	kfree_skb_reason(skb, reason);
 	return;
 
 tx_error:
@@ -2624,7 +2633,7 @@ void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
 	dst_release(ndst);
 	DEV_STATS_INC(dev, tx_errors);
 	vxlan_vnifilter_count(vxlan, vni, NULL, VXLAN_VNI_STATS_TX_ERRORS, 0);
-	kfree_skb(skb);
+	kfree_skb_reason(skb, reason);
 }
 
 static void vxlan_xmit_nh(struct sk_buff *skb, struct net_device *dev,
-- 
2.39.5