1766 	icsk->icsk_mtup.enabled = READ_ONCE(net->ipv4.sysctl_tcp_mtu_probing) > 1;  in tcp_mtup_init()
1767 	icsk->icsk_mtup.search_high = tp->rx_opt.mss_clamp + sizeof(struct tcphdr) +  in tcp_mtup_init()
1769 	icsk->icsk_mtup.search_low = tcp_mss_to_mtu(sk, READ_ONCE(net->ipv4.sysctl_tcp_base_mss));  in tcp_mtup_init()
1770 	icsk->icsk_mtup.probe_size = 0;  in tcp_mtup_init()
1771 	if (icsk->icsk_mtup.enabled)  in tcp_mtup_init()
1772 		icsk->icsk_mtup.probe_timestamp = tcp_jiffies32;  in tcp_mtup_init()
1804 	if (icsk->icsk_mtup.search_high > pmtu)  in tcp_sync_mss()
1805 		icsk->icsk_mtup.search_high = pmtu;  in tcp_sync_mss()
1812 	if (icsk->icsk_mtup.enabled)  in tcp_sync_mss()
1813 		mss_now = min(mss_now, tcp_mtu_to_mss(sk, icsk->icsk_mtup.search_low));  in tcp_sync_mss()
2290 	delta = tcp_jiffies32 - icsk->icsk_mtup.probe_timestamp;  in tcp_mtu_check_reprobe()
2295 		icsk->icsk_mtup.probe_size = 0;  in tcp_mtu_check_reprobe()
2296 		icsk->icsk_mtup.search_high = tp->rx_opt.mss_clamp +  in tcp_mtu_check_reprobe()
2299 		icsk->icsk_mtup.search_low = tcp_mss_to_mtu(sk, mss);  in tcp_mtu_check_reprobe()
2302 		icsk->icsk_mtup.probe_timestamp = tcp_jiffies32;  in tcp_mtu_check_reprobe()
2403 	if (likely(!icsk->icsk_mtup.enabled ||  in tcp_mtu_probe()
2404 		   icsk->icsk_mtup.probe_size ||  in tcp_mtu_probe()
2415 	probe_size = tcp_mtu_to_mss(sk, (icsk->icsk_mtup.search_high +  in tcp_mtu_probe()
2416 				    icsk->icsk_mtup.search_low) >> 1);  in tcp_mtu_probe()
2418 	interval = icsk->icsk_mtup.search_high - icsk->icsk_mtup.search_low;  in tcp_mtu_probe()
2423 	if (probe_size > tcp_mtu_to_mss(sk, icsk->icsk_mtup.search_high) ||  in tcp_mtu_probe()
2516 		icsk->icsk_mtup.probe_size = tcp_mss_to_mtu(sk, nskb->len);  in tcp_mtu_probe()
3260 	if (icsk->icsk_mtup.probe_size)  in __tcp_retransmit_skb()
3261 		icsk->icsk_mtup.probe_size = 0;  in __tcp_retransmit_skb()