Subject: [PATCH 11/23] net/dst: add new function skb_dst_update_pmtu_no_confirm

From: Hangbin Liu <[email-masked]>
Date: Sun, 22 Dec 2019 10:51:12 +0800

[ Upstream commit 07dc35c6e3cc3c001915d05f5bf21f80a39a0970 ]

Add a new function skb_dst_update_pmtu_no_confirm() for callers who need
update pmtu but should not do neighbor confirm.

v5: No change.
v4: No change.
v3: Do not remove dst_confirm_neigh, but add a new bool parameter in
    dst_ops.update_pmtu to control whether we should do neighbor confirm.
    Also split the big patch to small ones for each area.
v2: Remove dst_confirm_neigh in __ip6_rt_update_pmtu.

Reviewed-by: Guillaume Nault <[email-masked]>
Acked-by: David Ahern <[email-masked]>
Signed-off-by: Hangbin Liu <[email-masked]>
Signed-off-by: David S. Miller <[email-masked]>
---
 include/net/dst.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/include/net/dst.h b/include/net/dst.h
index aac3f5b4c7b5..c886c45ba286 100644
--- a/include/net/dst.h
+++ b/include/net/dst.h
@@ -530,6 +530,15 @@ static inline void skb_dst_update_pmtu(struct sk_buff *skb, u32 mtu)
 		dst->ops->update_pmtu(dst, NULL, skb, mtu, true);
 }
 
+/* update dst pmtu but not do neighbor confirm */
+static inline void skb_dst_update_pmtu_no_confirm(struct sk_buff *skb, u32 mtu)
+{
+	struct dst_entry *dst = skb_dst(skb);
+
+	if (dst && dst->ops->update_pmtu)
+		dst->ops->update_pmtu(dst, NULL, skb, mtu, false);
+}
+
 static inline void skb_tunnel_check_pmtu(struct sk_buff *skb,
 					 struct dst_entry *encap_dst,
 					 int headroom)
-- 
2.20.1