202 	unsigned int	mtu;  member
210 		  unsigned int mtu, bool DF, struct ip_frag_state *state);
472 	unsigned int mtu, res;  in ip_dst_mtu_maybe_forward()  local
482 		mtu = rt->rt_pmtu;  in ip_dst_mtu_maybe_forward()
483 		if (mtu && time_before(jiffies, READ_ONCE(rt->dst.expires)))  in ip_dst_mtu_maybe_forward()
488 	mtu = dst_metric_raw(dst, RTAX_MTU);  in ip_dst_mtu_maybe_forward()
489 	if (mtu)  in ip_dst_mtu_maybe_forward()
492 	mtu = READ_ONCE(dev->mtu);  in ip_dst_mtu_maybe_forward()
495 		if (rt->rt_uses_gateway && mtu > 576)  in ip_dst_mtu_maybe_forward()
496 			mtu = 576;  in ip_dst_mtu_maybe_forward()
500 	mtu = min_t(unsigned int, mtu, IP_MAX_MTU);  in ip_dst_mtu_maybe_forward()
502 	res = mtu - lwtunnel_headroom(dst->lwtstate, mtu);  in ip_dst_mtu_maybe_forward()
513 	unsigned int mtu;  in ip_skb_dst_mtu()  local
521 	mtu = min(READ_ONCE(dst_dev(dst)->mtu), IP_MAX_MTU);  in ip_skb_dst_mtu()
522 	return mtu - lwtunnel_headroom(dst->lwtstate, mtu);  in ip_skb_dst_mtu()
828 static inline bool inetdev_valid_mtu(unsigned int mtu)  in inetdev_valid_mtu()  argument
830 	return likely(mtu >= IPV4_MIN_MTU);  in inetdev_valid_mtu()