201 	unsigned int	mtu;  member
209 		  unsigned int mtu, bool DF, struct ip_frag_state *state);
475 	unsigned int mtu, res;  in ip_dst_mtu_maybe_forward()  local
484 		mtu = rt->rt_pmtu;  in ip_dst_mtu_maybe_forward()
485 		if (mtu && time_before(jiffies, rt->dst.expires))  in ip_dst_mtu_maybe_forward()
490 	mtu = dst_metric_raw(dst, RTAX_MTU);  in ip_dst_mtu_maybe_forward()
491 	if (mtu)  in ip_dst_mtu_maybe_forward()
494 	mtu = READ_ONCE(dst->dev->mtu);  in ip_dst_mtu_maybe_forward()
497 		if (rt->rt_uses_gateway && mtu > 576)  in ip_dst_mtu_maybe_forward()
498 			mtu = 576;  in ip_dst_mtu_maybe_forward()
502 	mtu = min_t(unsigned int, mtu, IP_MAX_MTU);  in ip_dst_mtu_maybe_forward()
504 	res = mtu - lwtunnel_headroom(dst->lwtstate, mtu);  in ip_dst_mtu_maybe_forward()
514 	unsigned int mtu;  in ip_skb_dst_mtu()  local
522 	mtu = min(READ_ONCE(skb_dst(skb)->dev->mtu), IP_MAX_MTU);  in ip_skb_dst_mtu()
523 	return mtu - lwtunnel_headroom(skb_dst(skb)->lwtstate, mtu);  in ip_skb_dst_mtu()
824 static inline bool inetdev_valid_mtu(unsigned int mtu)  in inetdev_valid_mtu()  argument
826 	return likely(mtu >= IPV4_MIN_MTU);  in inetdev_valid_mtu()