diff options
| author | Eric Dumazet <edumazet@google.com> | 2021-11-18 18:23:55 -0800 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2021-11-19 20:09:55 -0800 |
| commit | 8d22679dc89a6d9e1d41b2514902e3f7ef51547a (patch) | |
| tree | 1977b52616447ab35399bc8cc18407cb35df6b79 | |
| parent | 520fbdf7fb19b7744e370d36d9244a446299ceb7 (diff) | |
ipv6: ip6_skb_dst_mtu() cleanups
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>
| -rw-r--r-- | include/net/ip6_route.h | 18 |
1 files changed, 9 insertions, 9 deletions
diff --git a/include/net/ip6_route.h b/include/net/ip6_route.h index 5efd0b71dc67..ca2d6b60e1ec 100644 --- a/include/net/ip6_route.h +++ b/include/net/ip6_route.h @@ -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; } |