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inet: add dst4_mtu() and dst6_mtu() helpers

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With CONFIG_MITIGATION_RETPOLINE=y dst_mtu() is a bit fat,
because it is generic.

Indeed, clang does not always inline it.

Add dst4_mtu() and dst6_mtu() helpers for callers that
expect either ipv4_mtu() or ip6_mtu() to be called.

These helpers are always inlined.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Kuniyuki Iwashima <kuniyu@google.com>
Link: https://patch.msgid.link/20260130210303.3888261-6-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Eric Dumazet
2026-01-30 21:03:00 +00:00
committed by Jakub Kicinski
parent 94a150bf14
commit 8776c4ef3a
2 changed files with 12 additions and 0 deletions
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6
include/net/dst.h
View File

@@ -219,6 +219,12 @@ static inline u32 dst_mtu(const struct dst_entry *dst)
return INDIRECT_CALL_INET(dst->ops->mtu, ip6_mtu, ipv4_mtu, dst);
}
/* Variant of dst_mtu() for IPv4 users. */
static inline u32 dst4_mtu(const struct dst_entry *dst)
{
return INDIRECT_CALL_1(dst->ops->mtu, ipv4_mtu, dst);
}
/* RTT metrics are stored in milliseconds for user ABI, but used as jiffies */
static inline unsigned long dst_metric_rtt(const struct dst_entry *dst, int metric)
{

6
include/net/ip6_route.h
View File

@@ -266,6 +266,12 @@ 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 *));
/* Variant of dst_mtu() for IPv6 users */
static inline u32 dst6_mtu(const struct dst_entry *dst)
{
return INDIRECT_CALL_1(dst->ops->mtu, ip6_mtu, dst);
}
static inline unsigned int ip6_skb_dst_mtu(const struct sk_buff *skb)
{
const struct ipv6_pinfo *np = skb->sk && !dev_recursion_level() ?