netdev - [PATCH net-next 7/9] tcp: convert tcp_comp_sack

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Date:   Wed, 31 Mar 2021 10:52:11 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     netdev <netdev@...r.kernel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Eric Dumazet <eric.dumazet@...il.com>
Subject: [PATCH net-next 7/9] tcp: convert tcp_comp_sack_nr sysctl to u8

From: Eric Dumazet <edumazet@...gle.com>

tcp_comp_sack_nr max value was already 255.

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
 include/net/netns/ipv4.h   | 2 +-
 net/ipv4/sysctl_net_ipv4.c | 6 ++----
 2 files changed, 3 insertions(+), 5 deletions(-)

diff --git a/include/net/netns/ipv4.h b/include/net/netns/ipv4.h
index fafcedf643832d80ebbd3d1c7c0fd8ac0866b99a..87e1612497eae2fb2c893c6c64d14ad373862f43 100644
--- a/include/net/netns/ipv4.h
+++ b/include/net/netns/ipv4.h
@@ -171,12 +171,12 @@ struct netns_ipv4 {
 	u8 sysctl_tcp_min_tso_segs;
 	u8 sysctl_tcp_autocorking;
 	u8 sysctl_tcp_reflect_tos;
+	u8 sysctl_tcp_comp_sack_nr;
 	int sysctl_tcp_invalid_ratelimit;
 	int sysctl_tcp_pacing_ss_ratio;
 	int sysctl_tcp_pacing_ca_ratio;
 	int sysctl_tcp_wmem[3];
 	int sysctl_tcp_rmem[3];
-	int sysctl_tcp_comp_sack_nr;
 	unsigned long sysctl_tcp_comp_sack_delay_ns;
 	unsigned long sysctl_tcp_comp_sack_slack_ns;
 	int sysctl_max_syn_backlog;
diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c
index fd2b35065bb21195f65b80d7a815221320f08eb3..a09e466ce11d04201bb4014e6895243c3bb2abdb 100644
--- a/net/ipv4/sysctl_net_ipv4.c
+++ b/net/ipv4/sysctl_net_ipv4.c
@@ -46,7 +46,6 @@ static int tcp_syn_retries_min = 1;
 static int tcp_syn_retries_max = MAX_TCP_SYNCNT;
 static int ip_ping_group_range_min[] = { 0, 0 };
 static int ip_ping_group_range_max[] = { GID_T_MAX, GID_T_MAX };
-static int comp_sack_nr_max = 255;
 static u32 u32_max_div_HZ = UINT_MAX / HZ;
 static int one_day_secs = 24 * 3600;
 
@@ -1330,11 +1329,10 @@ static struct ctl_table ipv4_net_table[] = {
 	{
 		.procname	= "tcp_comp_sack_nr",
 		.data		= &init_net.ipv4.sysctl_tcp_comp_sack_nr,
-		.maxlen		= sizeof(int),
+		.maxlen		= sizeof(u8),
 		.mode		= 0644,
-		.proc_handler	= proc_dointvec_minmax,
+		.proc_handler	= proc_dou8vec_minmax,
 		.extra1		= SYSCTL_ZERO,
-		.extra2		= &comp_sack_nr_max,
 	},
 	{
 		.procname       = "tcp_reflect_tos",
-- 
2.31.0.291.g576ba9dcdaf-goog