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include: net: add static inline dst_dev_overhead() to dst.h

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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>
This commit is contained in:
Justin Iurman
2024-12-03 13:49:42 +01:00
committed by Paolo Abeni
parent 152d00a913
commit 0600cf40e9
1 changed files with 9 additions and 0 deletions
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include/net/dst.h
+9
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@@ -440,6 +440,15 @@ 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 *,