Commit 8d22679d authored by Eric Dumazet's avatar Eric Dumazet Committed by Jakub Kicinski
Browse files

ipv6: ip6_skb_dst_mtu() cleanups 



Use const attribute where we can, and cache skb_dst()

Signed-off-by: default avatarEric Dumazet <edumazet@google.com>
Link: https://lore.kernel.org/r/20211119022355.2985984-1-eric.dumazet@gmail.com


Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
parent 520fbdf7

include/net/ip6_route.h

+9 −9
Original line number Diff line number Diff line
@@ -263,19 +263,19 @@ static inline bool ipv6_anycast_destination(const struct dst_entry *dst, 
int ip6_fragment(struct net *net, struct sock *sk, struct sk_buff *skb,

		 int (*output)(struct net *, struct sock *, struct sk_buff *));



static inline unsigned int ip6_skb_dst_mtu(struct sk_buff *skb)

static inline unsigned int ip6_skb_dst_mtu(const struct sk_buff *skb)

{

	unsigned int mtu;



	struct ipv6_pinfo *np = skb->sk && !dev_recursion_level() ?

	const struct ipv6_pinfo *np = skb->sk && !dev_recursion_level() ?

				inet6_sk(skb->sk) : NULL;

	const struct dst_entry *dst = skb_dst(skb);

	unsigned int mtu;



	if (np && np->pmtudisc >= IPV6_PMTUDISC_PROBE) {

		mtu = READ_ONCE(skb_dst(skb)->dev->mtu);

		mtu -= lwtunnel_headroom(skb_dst(skb)->lwtstate, mtu);

	} else

		mtu = dst_mtu(skb_dst(skb));



		mtu = READ_ONCE(dst->dev->mtu);

		mtu -= lwtunnel_headroom(dst->lwtstate, mtu);

	} else {

		mtu = dst_mtu(dst);

	}

	return mtu;

}