diff --git a/Documentation/networking/ip-sysctl.rst b/Documentation/networking/ip-sysctl.rst
index 4b19c8d3efda..d3523c9064a2 100644
--- a/Documentation/networking/ip-sysctl.rst
+++ b/Documentation/networking/ip-sysctl.rst
@@ -1128,6 +1128,8 @@ tcp_tso_rtt_log - INTEGER
 
 	If you want to use the old autosizing, set this sysctl to 0.
 
+	Possible values are [0, 31], inclusive.
+
 	Default: 9  (2^9 = 512 usec)
 
 tcp_pacing_ss_ratio - INTEGER
diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c
index e3760daa3470..bf193e7ec516 100644
--- a/net/ipv4/sysctl_net_ipv4.c
+++ b/net/ipv4/sysctl_net_ipv4.c
@@ -26,6 +26,7 @@ static int ip_local_port_range_max[] = { 65535, 65535 };
 static int tcp_adv_win_scale_min = -31;
 static int tcp_adv_win_scale_max = 31;
 static int tcp_app_win_max = 31;
+static int tcp_tso_rtt_log_max = 31;
 static int tcp_min_snd_mss_min = TCP_MIN_SND_MSS;
 static int tcp_min_snd_mss_max = 65535;
 static int tcp_rto_max_max = TCP_RTO_MAX_SEC * MSEC_PER_SEC;
@@ -1406,6 +1407,7 @@ static const struct ctl_table ipv4_net_table[] = {
 		.maxlen		= sizeof(u8),
 		.mode		= 0644,
 		.proc_handler	= proc_dou8vec_minmax,
+		.extra2		= &tcp_tso_rtt_log_max,
 	},
 	{
 		.procname	= "tcp_min_rtt_wlen",