5.10-stable review patch. If anyone has any objections, please let me know.
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From: Justin Iurman justin.iurman@uliege.be
[ Upstream commit 0600cf40e9b36fe17f9c9f04d4f9cef249eaa5e7 ]
Add static inline dst_dev_overhead() function to include/net/dst.h. This helper function is used by ioam6_iptunnel, rpl_iptunnel and seg6_iptunnel to get the dev's overhead based on a cache entry (dst_entry). If the cache is empty, the default and generic value skb->mac_len is returned. Otherwise, LL_RESERVED_SPACE() over dst's dev is returned.
Signed-off-by: Justin Iurman justin.iurman@uliege.be Cc: Alexander Lobakin aleksander.lobakin@intel.com Cc: Vadim Fedorenko vadim.fedorenko@linux.dev Signed-off-by: Paolo Abeni pabeni@redhat.com Stable-dep-of: 13e55fbaec17 ("net: ipv6: fix dst ref loop on input in rpl lwt") Signed-off-by: Sasha Levin sashal@kernel.org --- include/net/dst.h | 9 +++++++++ 1 file changed, 9 insertions(+)
diff --git a/include/net/dst.h b/include/net/dst.h index af57a6284444c..9114272f81009 100644 --- a/include/net/dst.h +++ b/include/net/dst.h @@ -431,6 +431,15 @@ static inline void dst_set_expires(struct dst_entry *dst, int timeout) dst->expires = expires; }
+static inline unsigned int dst_dev_overhead(struct dst_entry *dst, + struct sk_buff *skb) +{ + if (likely(dst)) + return LL_RESERVED_SPACE(dst->dev); + + return skb->mac_len; +} + INDIRECT_CALLABLE_DECLARE(int ip6_output(struct net *, struct sock *, struct sk_buff *)); INDIRECT_CALLABLE_DECLARE(int ip_output(struct net *, struct sock *,