300 	int mtu = ETH_DATA_LEN;  in ip_tunnel_bind_dev()  local
331 		mtu = min(tdev->mtu, IP_MAX_MTU);  in ip_tunnel_bind_dev()
335 	mtu -= (dev->hard_header_len + t_hlen);  in ip_tunnel_bind_dev()
337 	if (mtu < IPV4_MIN_MTU)  in ip_tunnel_bind_dev()
338 		mtu = IPV4_MIN_MTU;  in ip_tunnel_bind_dev()
340 	return mtu;  in ip_tunnel_bind_dev()
350 	int mtu;  in ip_tunnel_create()  local
357 	mtu = ip_tunnel_bind_dev(dev);  in ip_tunnel_create()
358 	err = dev_set_mtu(dev, mtu);  in ip_tunnel_create()
508 	int mtu;  in tnl_update_pmtu()  local
511 		mtu = dst_mtu(&rt->dst) - dev->hard_header_len  in tnl_update_pmtu()
514 		mtu = skb_dst(skb) ? dst_mtu(skb_dst(skb)) : dev->mtu;  in tnl_update_pmtu()
516 	skb_dst_update_pmtu(skb, mtu);  in tnl_update_pmtu()
521 		    mtu < pkt_size) {  in tnl_update_pmtu()
523 			icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu));  in tnl_update_pmtu()
531 		if (rt6 && mtu < dst_mtu(skb_dst(skb)) &&  in tnl_update_pmtu()
532 			   mtu >= IPV6_MIN_MTU) {  in tnl_update_pmtu()
537 				dst_metric_set(skb_dst(skb), RTAX_MTU, mtu);  in tnl_update_pmtu()
541 		if (!skb_is_gso(skb) && mtu >= IPV6_MIN_MTU &&  in tnl_update_pmtu()
542 					mtu < pkt_size) {  in tnl_update_pmtu()
543 			icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);  in tnl_update_pmtu()
824 		int mtu;  in ip_tunnel_update()  local
828 		mtu = ip_tunnel_bind_dev(dev);  in ip_tunnel_update()
830 			dev->mtu = mtu;  in ip_tunnel_update()
954 	dev->mtu = new_mtu;  in __ip_tunnel_change_mtu()
1035 		itn->fb_tunnel_dev->mtu = ip_tunnel_bind_dev(itn->fb_tunnel_dev);  in ip_tunnel_init_net()
1093 	int mtu;  in ip_tunnel_newlink()  local
1117 	mtu = ip_tunnel_bind_dev(dev);  in ip_tunnel_newlink()
1121 		mtu = clamp(dev->mtu, (unsigned int)ETH_MIN_MTU,  in ip_tunnel_newlink()
1125 	err = dev_set_mtu(dev, mtu);  in ip_tunnel_newlink()