Commit 8776c4ef authored by Eric Dumazet's avatar Eric Dumazet Committed by Jakub Kicinski
Browse files

inet: add dst4_mtu() and dst6_mtu() helpers 



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: default avatarEric Dumazet <edumazet@google.com>
Reviewed-by: default avatarKuniyuki Iwashima <kuniyu@google.com>
Link: https://patch.msgid.link/20260130210303.3888261-6-edumazet@google.com


Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
parent 94a150bf

include/net/dst.h

+6 −0
Original line number Diff line number Diff line
@@ -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)

{

include/net/ip6_route.h

+6 −0
Original line number Diff line number Diff line
@@ -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() ?