1354 	icsk->icsk_mtup.enabled = net->ipv4.sysctl_tcp_mtu_probing > 1;  in tcp_mtup_init()
1355 	icsk->icsk_mtup.search_high = tp->rx_opt.mss_clamp + sizeof(struct tcphdr) +  in tcp_mtup_init()
1357 	icsk->icsk_mtup.search_low = tcp_mss_to_mtu(sk, net->ipv4.sysctl_tcp_base_mss);  in tcp_mtup_init()
1358 	icsk->icsk_mtup.probe_size = 0;  in tcp_mtup_init()
1359 	if (icsk->icsk_mtup.enabled)  in tcp_mtup_init()
1360 		icsk->icsk_mtup.probe_timestamp = tcp_time_stamp;  in tcp_mtup_init()
1392 	if (icsk->icsk_mtup.search_high > pmtu)  in tcp_sync_mss()
1393 		icsk->icsk_mtup.search_high = pmtu;  in tcp_sync_mss()
1400 	if (icsk->icsk_mtup.enabled)  in tcp_sync_mss()
1401 		mss_now = min(mss_now, tcp_mtu_to_mss(sk, icsk->icsk_mtup.search_low));  in tcp_sync_mss()
1843 	delta = tcp_time_stamp - icsk->icsk_mtup.probe_timestamp;  in tcp_mtu_check_reprobe()
1848 		icsk->icsk_mtup.probe_size = 0;  in tcp_mtu_check_reprobe()
1849 		icsk->icsk_mtup.search_high = tp->rx_opt.mss_clamp +  in tcp_mtu_check_reprobe()
1852 		icsk->icsk_mtup.search_low = tcp_mss_to_mtu(sk, mss);  in tcp_mtu_check_reprobe()
1855 		icsk->icsk_mtup.probe_timestamp = tcp_time_stamp;  in tcp_mtu_check_reprobe()
1885 	if (!icsk->icsk_mtup.enabled ||  in tcp_mtu_probe()
1886 	    icsk->icsk_mtup.probe_size ||  in tcp_mtu_probe()
1897 	probe_size = tcp_mtu_to_mss(sk, (icsk->icsk_mtup.search_high +  in tcp_mtu_probe()
1898 				    icsk->icsk_mtup.search_low) >> 1);  in tcp_mtu_probe()
1900 	interval = icsk->icsk_mtup.search_high - icsk->icsk_mtup.search_low;  in tcp_mtu_probe()
1905 	if (probe_size > tcp_mtu_to_mss(sk, icsk->icsk_mtup.search_high) ||  in tcp_mtu_probe()
1996 		icsk->icsk_mtup.probe_size = tcp_mss_to_mtu(sk, nskb->len);  in tcp_mtu_probe()
2563 	if (icsk->icsk_mtup.probe_size) {  in __tcp_retransmit_skb()
2564 		icsk->icsk_mtup.probe_size = 0;  in __tcp_retransmit_skb()