diff mbox series

[net-next,2/5] ipv4: shrink netns_ipv4 with sysctl conversions

Message ID 20210325180817.840042-3-eric.dumazet@gmail.com (mailing list archive)
State Accepted
Commit 4b6bbf17d4e1939afa72821879fc033d725e9491
Delegated to: Netdev Maintainers
Headers show
Series net: use less storage for most sysctl | expand

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Commit Message

Eric Dumazet March 25, 2021, 6:08 p.m. UTC 
From: Eric Dumazet <edumazet@google.com>

These sysctls that can fit in one byte instead of one int
are converted to save space and thus reduce cache line misses.

 - icmp_echo_ignore_all, icmp_echo_ignore_broadcasts,
 - icmp_ignore_bogus_error_responses, icmp_errors_use_inbound_ifaddr
 - tcp_ecn, tcp_ecn_fallback
 - ip_default_ttl, ip_no_pmtu_disc, ip_fwd_use_pmtu
 - ip_nonlocal_bind, ip_autobind_reuse
 - ip_dynaddr, ip_early_demux, raw_l3mdev_accept
 - nexthop_compat_mode, fwmark_reflect

Signed-off-by: Eric Dumazet <edumazet@google.com>
---
 include/net/netns/ipv4.h   | 32 +++++++++----------
 net/ipv4/sysctl_net_ipv4.c | 64 +++++++++++++++++++-------------------
 2 files changed, 48 insertions(+), 48 deletions(-)
diff mbox series

Patch

diff --git a/include/net/netns/ipv4.h b/include/net/netns/ipv4.h
index 9e3cb2722b804bc6618632128185c311e5210146..7b572d468fde5ae104ecdf4bd5b8118290deb81d 100644
--- a/include/net/netns/ipv4.h
+++ b/include/net/netns/ipv4.h
@@ -83,36 +83,36 @@  struct netns_ipv4 {
 	struct xt_table		*nat_table;
 #endif
 
-	int sysctl_icmp_echo_ignore_all;
-	int sysctl_icmp_echo_ignore_broadcasts;
-	int sysctl_icmp_ignore_bogus_error_responses;
+	u8 sysctl_icmp_echo_ignore_all;
+	u8 sysctl_icmp_echo_ignore_broadcasts;
+	u8 sysctl_icmp_ignore_bogus_error_responses;
+	u8 sysctl_icmp_errors_use_inbound_ifaddr;
 	int sysctl_icmp_ratelimit;
 	int sysctl_icmp_ratemask;
-	int sysctl_icmp_errors_use_inbound_ifaddr;
 
 	struct local_ports ip_local_ports;
 
-	int sysctl_tcp_ecn;
-	int sysctl_tcp_ecn_fallback;
+	u8 sysctl_tcp_ecn;
+	u8 sysctl_tcp_ecn_fallback;
 
-	int sysctl_ip_default_ttl;
-	int sysctl_ip_no_pmtu_disc;
-	int sysctl_ip_fwd_use_pmtu;
+	u8 sysctl_ip_default_ttl;
+	u8 sysctl_ip_no_pmtu_disc;
+	u8 sysctl_ip_fwd_use_pmtu;
 	int sysctl_ip_fwd_update_priority;
-	int sysctl_ip_nonlocal_bind;
-	int sysctl_ip_autobind_reuse;
+	u8 sysctl_ip_nonlocal_bind;
+	u8 sysctl_ip_autobind_reuse;
 	/* Shall we try to damage output packets if routing dev changes? */
-	int sysctl_ip_dynaddr;
-	int sysctl_ip_early_demux;
+	u8 sysctl_ip_dynaddr;
+	u8 sysctl_ip_early_demux;
 #ifdef CONFIG_NET_L3_MASTER_DEV
-	int sysctl_raw_l3mdev_accept;
+	u8 sysctl_raw_l3mdev_accept;
 #endif
 	int sysctl_tcp_early_demux;
 	int sysctl_udp_early_demux;
 
-	int sysctl_nexthop_compat_mode;
+	u8 sysctl_nexthop_compat_mode;
 
-	int sysctl_fwmark_reflect;
+	u8 sysctl_fwmark_reflect;
 	int sysctl_tcp_fwmark_accept;
 #ifdef CONFIG_NET_L3_MASTER_DEV
 	int sysctl_tcp_l3mdev_accept;
diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c
index f55095d3ed1656fdb8badaed7eb58832c5063299..e5ff17526603c274d50350bc1ebb21e20c598c9a 100644
--- a/net/ipv4/sysctl_net_ipv4.c
+++ b/net/ipv4/sysctl_net_ipv4.c
@@ -595,30 +595,30 @@  static struct ctl_table ipv4_net_table[] = {
 	{
 		.procname	= "icmp_echo_ignore_all",
 		.data		= &init_net.ipv4.sysctl_icmp_echo_ignore_all,
-		.maxlen		= sizeof(int),
+		.maxlen		= sizeof(u8),
 		.mode		= 0644,
-		.proc_handler	= proc_dointvec
+		.proc_handler	= proc_dou8vec_minmax,
 	},
 	{
 		.procname	= "icmp_echo_ignore_broadcasts",
 		.data		= &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
-		.maxlen		= sizeof(int),
+		.maxlen		= sizeof(u8),
 		.mode		= 0644,
-		.proc_handler	= proc_dointvec
+		.proc_handler	= proc_dou8vec_minmax,
 	},
 	{
 		.procname	= "icmp_ignore_bogus_error_responses",
 		.data		= &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
-		.maxlen		= sizeof(int),
+		.maxlen		= sizeof(u8),
 		.mode		= 0644,
-		.proc_handler	= proc_dointvec
+		.proc_handler	= proc_dou8vec_minmax,
 	},
 	{
 		.procname	= "icmp_errors_use_inbound_ifaddr",
 		.data		= &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
-		.maxlen		= sizeof(int),
+		.maxlen		= sizeof(u8),
 		.mode		= 0644,
-		.proc_handler	= proc_dointvec
+		.proc_handler	= proc_dou8vec_minmax,
 	},
 	{
 		.procname	= "icmp_ratelimit",
@@ -645,9 +645,9 @@  static struct ctl_table ipv4_net_table[] = {
 	{
 		.procname	= "raw_l3mdev_accept",
 		.data		= &init_net.ipv4.sysctl_raw_l3mdev_accept,
-		.maxlen		= sizeof(int),
+		.maxlen		= sizeof(u8),
 		.mode		= 0644,
-		.proc_handler	= proc_dointvec_minmax,
+		.proc_handler	= proc_dou8vec_minmax,
 		.extra1		= SYSCTL_ZERO,
 		.extra2		= SYSCTL_ONE,
 	},
@@ -655,30 +655,30 @@  static struct ctl_table ipv4_net_table[] = {
 	{
 		.procname	= "tcp_ecn",
 		.data		= &init_net.ipv4.sysctl_tcp_ecn,
-		.maxlen		= sizeof(int),
+		.maxlen		= sizeof(u8),
 		.mode		= 0644,
-		.proc_handler	= proc_dointvec
+		.proc_handler	= proc_dou8vec_minmax,
 	},
 	{
 		.procname	= "tcp_ecn_fallback",
 		.data		= &init_net.ipv4.sysctl_tcp_ecn_fallback,
-		.maxlen		= sizeof(int),
+		.maxlen		= sizeof(u8),
 		.mode		= 0644,
-		.proc_handler	= proc_dointvec
+		.proc_handler	= proc_dou8vec_minmax,
 	},
 	{
 		.procname	= "ip_dynaddr",
 		.data		= &init_net.ipv4.sysctl_ip_dynaddr,
-		.maxlen		= sizeof(int),
+		.maxlen		= sizeof(u8),
 		.mode		= 0644,
-		.proc_handler	= proc_dointvec
+		.proc_handler	= proc_dou8vec_minmax,
 	},
 	{
 		.procname	= "ip_early_demux",
 		.data		= &init_net.ipv4.sysctl_ip_early_demux,
-		.maxlen		= sizeof(int),
+		.maxlen		= sizeof(u8),
 		.mode		= 0644,
-		.proc_handler	= proc_dointvec
+		.proc_handler	= proc_dou8vec_minmax,
 	},
 	{
 		.procname       = "udp_early_demux",
@@ -697,18 +697,18 @@  static struct ctl_table ipv4_net_table[] = {
 	{
 		.procname       = "nexthop_compat_mode",
 		.data           = &init_net.ipv4.sysctl_nexthop_compat_mode,
-		.maxlen         = sizeof(int),
+		.maxlen         = sizeof(u8),
 		.mode           = 0644,
-		.proc_handler   = proc_dointvec_minmax,
+		.proc_handler   = proc_dou8vec_minmax,
 		.extra1		= SYSCTL_ZERO,
 		.extra2		= SYSCTL_ONE,
 	},
 	{
 		.procname	= "ip_default_ttl",
 		.data		= &init_net.ipv4.sysctl_ip_default_ttl,
-		.maxlen		= sizeof(int),
+		.maxlen		= sizeof(u8),
 		.mode		= 0644,
-		.proc_handler	= proc_dointvec_minmax,
+		.proc_handler	= proc_dou8vec_minmax,
 		.extra1		= &ip_ttl_min,
 		.extra2		= &ip_ttl_max,
 	},
@@ -729,16 +729,16 @@  static struct ctl_table ipv4_net_table[] = {
 	{
 		.procname	= "ip_no_pmtu_disc",
 		.data		= &init_net.ipv4.sysctl_ip_no_pmtu_disc,
-		.maxlen		= sizeof(int),
+		.maxlen		= sizeof(u8),
 		.mode		= 0644,
-		.proc_handler	= proc_dointvec
+		.proc_handler	= proc_dou8vec_minmax,
 	},
 	{
 		.procname	= "ip_forward_use_pmtu",
 		.data		= &init_net.ipv4.sysctl_ip_fwd_use_pmtu,
-		.maxlen		= sizeof(int),
+		.maxlen		= sizeof(u8),
 		.mode		= 0644,
-		.proc_handler	= proc_dointvec,
+		.proc_handler	= proc_dou8vec_minmax,
 	},
 	{
 		.procname	= "ip_forward_update_priority",
@@ -752,25 +752,25 @@  static struct ctl_table ipv4_net_table[] = {
 	{
 		.procname	= "ip_nonlocal_bind",
 		.data		= &init_net.ipv4.sysctl_ip_nonlocal_bind,
-		.maxlen		= sizeof(int),
+		.maxlen		= sizeof(u8),
 		.mode		= 0644,
-		.proc_handler	= proc_dointvec
+		.proc_handler	= proc_dou8vec_minmax,
 	},
 	{
 		.procname	= "ip_autobind_reuse",
 		.data		= &init_net.ipv4.sysctl_ip_autobind_reuse,
-		.maxlen		= sizeof(int),
+		.maxlen		= sizeof(u8),
 		.mode		= 0644,
-		.proc_handler	= proc_dointvec_minmax,
+		.proc_handler	= proc_dou8vec_minmax,
 		.extra1         = SYSCTL_ZERO,
 		.extra2         = SYSCTL_ONE,
 	},
 	{
 		.procname	= "fwmark_reflect",
 		.data		= &init_net.ipv4.sysctl_fwmark_reflect,
-		.maxlen		= sizeof(int),
+		.maxlen		= sizeof(u8),
 		.mode		= 0644,
-		.proc_handler	= proc_dointvec,
+		.proc_handler	= proc_dou8vec_minmax,
 	},
 	{
 		.procname	= "tcp_fwmark_accept",