ipv4: shrink netns_ipv4 with sysctl conversions

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>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/net/netns/ipv4.h b/include/net/netns/ipv4.h
index 9e3cb27..7b572d4 100644 (file)
--- 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 f55095d..e5ff175 100644 (file)
--- 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",