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ipv6: ip6_skb_dst_mtu() cleanups

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

Signed-off-by: Eric Dumazet <edumazet@google.com>
Link: https://lore.kernel.org/r/20211119022355.2985984-1-eric.dumazet@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Eric Dumazet 2021-11-18 18:23:55 -08:00 committed by Jakub Kicinski
parent 520fbdf7fb
commit 8d22679dc8
1 changed files with 9 additions and 9 deletions
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18
include/net/ip6_route.h
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@ -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)
{
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;
struct ipv6_pinfo *np = skb->sk && !dev_recursion_level() ?
inet6_sk(skb->sk) : NULL;
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;
}