193 	unsigned int	mtu;  member
201 		  unsigned int mtu, bool DF, struct ip_frag_state *state);
441 	unsigned int mtu;  in ip_dst_mtu_maybe_forward()  local
446 		mtu = rt->rt_pmtu;  in ip_dst_mtu_maybe_forward()
447 		if (mtu && time_before(jiffies, rt->dst.expires))  in ip_dst_mtu_maybe_forward()
452 	mtu = dst_metric_raw(dst, RTAX_MTU);  in ip_dst_mtu_maybe_forward()
453 	if (mtu)  in ip_dst_mtu_maybe_forward()
456 	mtu = READ_ONCE(dst->dev->mtu);  in ip_dst_mtu_maybe_forward()
459 		if (rt->rt_uses_gateway && mtu > 576)  in ip_dst_mtu_maybe_forward()
460 			mtu = 576;  in ip_dst_mtu_maybe_forward()
464 	mtu = min_t(unsigned int, mtu, IP_MAX_MTU);  in ip_dst_mtu_maybe_forward()
466 	return mtu - lwtunnel_headroom(dst->lwtstate, mtu);  in ip_dst_mtu_maybe_forward()
472 	unsigned int mtu;  in ip_skb_dst_mtu()  local
480 	mtu = min(READ_ONCE(skb_dst(skb)->dev->mtu), IP_MAX_MTU);  in ip_skb_dst_mtu()
481 	return mtu - lwtunnel_headroom(skb_dst(skb)->lwtstate, mtu);  in ip_skb_dst_mtu()
778 static inline bool inetdev_valid_mtu(unsigned int mtu)  in inetdev_valid_mtu()  argument
780 	return likely(mtu >= IPV4_MIN_MTU);  in inetdev_valid_mtu()