linux-kernel - [PATCH net-next] ipv4: delete sysctls about routing cache

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Date:   Thu, 23 Dec 2021 12:20:10 +0000
From:   cgel.zte@...il.com
To:     davem@...emloft.net
Cc:     yoshfuji@...ux-ipv6.org, dsahern@...nel.org, kuba@...nel.org,
        prestwoj@...il.com, xu.xin16@....com.cn, zxu@...kedin.com,
        praveen5582@...il.com, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, Zeal Robot <zealci@....com.cn>
Subject: [PATCH net-next] ipv4: delete sysctls about routing cache

From: xu xin <xu.xin16@....com.cn>

Since routing cache in ipv4 has been deleted in 2012, the sysctls about
it are useless.

Reported-by: Zeal Robot <zealci@....com.cn>
Signed-off-by: xu xin <xu.xin16@....com.cn>
---
 include/uapi/linux/sysctl.h | 10 ++++----
 net/ipv4/route.c            | 48 -------------------------------------
 2 files changed, 5 insertions(+), 53 deletions(-)

diff --git a/include/uapi/linux/sysctl.h b/include/uapi/linux/sysctl.h
index 6a3b194c50fe..72ecdf38c4ed 100644
--- a/include/uapi/linux/sysctl.h
+++ b/include/uapi/linux/sysctl.h
@@ -432,9 +432,9 @@ enum {
 	NET_IPV4_ROUTE_FLUSH=1,
 	NET_IPV4_ROUTE_MIN_DELAY=2, /* obsolete since 2.6.25 */
 	NET_IPV4_ROUTE_MAX_DELAY=3, /* obsolete since 2.6.25 */
-	NET_IPV4_ROUTE_GC_THRESH=4,
-	NET_IPV4_ROUTE_MAX_SIZE=5,
-	NET_IPV4_ROUTE_GC_MIN_INTERVAL=6,
+	NET_IPV4_ROUTE_GC_THRESH=4, /* obsolete */
+	NET_IPV4_ROUTE_MAX_SIZE=5,  /* obsolete */
+	NET_IPV4_ROUTE_GC_MIN_INTERVAL=6, /* obsolete */
 	NET_IPV4_ROUTE_GC_TIMEOUT=7,
 	NET_IPV4_ROUTE_GC_INTERVAL=8, /* obsolete since 2.6.38 */
 	NET_IPV4_ROUTE_REDIRECT_LOAD=9,
@@ -442,12 +442,12 @@ enum {
 	NET_IPV4_ROUTE_REDIRECT_SILENCE=11,
 	NET_IPV4_ROUTE_ERROR_COST=12,
 	NET_IPV4_ROUTE_ERROR_BURST=13,
-	NET_IPV4_ROUTE_GC_ELASTICITY=14,
+	NET_IPV4_ROUTE_GC_ELASTICITY=14, /* obsolete */
 	NET_IPV4_ROUTE_MTU_EXPIRES=15,
 	NET_IPV4_ROUTE_MIN_PMTU=16,
 	NET_IPV4_ROUTE_MIN_ADVMSS=17,
 	NET_IPV4_ROUTE_SECRET_INTERVAL=18,
-	NET_IPV4_ROUTE_GC_MIN_INTERVAL_MS=19,
+	NET_IPV4_ROUTE_GC_MIN_INTERVAL_MS=19, /* obsolete */
 };
 
 enum
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 843a7a3699fe..4b0d7d654859 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -110,7 +110,6 @@
 
 #define RT_GC_TIMEOUT (300*HZ)
 
-static int ip_rt_max_size;
 static int ip_rt_redirect_number __read_mostly	= 9;
 static int ip_rt_redirect_load __read_mostly	= HZ / 50;
 static int ip_rt_redirect_silence __read_mostly	= ((HZ / 50) << (9 + 1));
@@ -3428,8 +3427,6 @@ void ip_rt_multicast_event(struct in_device *in_dev)
 }
 
 #ifdef CONFIG_SYSCTL
-static int ip_rt_gc_interval __read_mostly  = 60 * HZ;
-static int ip_rt_gc_min_interval __read_mostly	= HZ / 2;
 static int ip_rt_gc_elasticity __read_mostly	= 8;
 static int ip_min_valid_pmtu __read_mostly	= IPV4_MIN_MTU;
 
@@ -3448,36 +3445,6 @@ static int ipv4_sysctl_rtcache_flush(struct ctl_table *__ctl, int write,
 }
 
 static struct ctl_table ipv4_route_table[] = {
-	{
-		.procname	= "gc_thresh",
-		.data		= &ipv4_dst_ops.gc_thresh,
-		.maxlen		= sizeof(int),
-		.mode		= 0644,
-		.proc_handler	= proc_dointvec,
-	},
-	{
-		.procname	= "max_size",
-		.data		= &ip_rt_max_size,
-		.maxlen		= sizeof(int),
-		.mode		= 0644,
-		.proc_handler	= proc_dointvec,
-	},
-	{
-		/*  Deprecated. Use gc_min_interval_ms */
-
-		.procname	= "gc_min_interval",
-		.data		= &ip_rt_gc_min_interval,
-		.maxlen		= sizeof(int),
-		.mode		= 0644,
-		.proc_handler	= proc_dointvec_jiffies,
-	},
-	{
-		.procname	= "gc_min_interval_ms",
-		.data		= &ip_rt_gc_min_interval,
-		.maxlen		= sizeof(int),
-		.mode		= 0644,
-		.proc_handler	= proc_dointvec_ms_jiffies,
-	},
 	{
 		.procname	= "gc_timeout",
 		.data		= &ip_rt_gc_timeout,
@@ -3485,13 +3452,6 @@ static struct ctl_table ipv4_route_table[] = {
 		.mode		= 0644,
 		.proc_handler	= proc_dointvec_jiffies,
 	},
-	{
-		.procname	= "gc_interval",
-		.data		= &ip_rt_gc_interval,
-		.maxlen		= sizeof(int),
-		.mode		= 0644,
-		.proc_handler	= proc_dointvec_jiffies,
-	},
 	{
 		.procname	= "redirect_load",
 		.data		= &ip_rt_redirect_load,
@@ -3527,13 +3487,6 @@ static struct ctl_table ipv4_route_table[] = {
 		.mode		= 0644,
 		.proc_handler	= proc_dointvec,
 	},
-	{
-		.procname	= "gc_elasticity",
-		.data		= &ip_rt_gc_elasticity,
-		.maxlen		= sizeof(int),
-		.mode		= 0644,
-		.proc_handler	= proc_dointvec,
-	},
 	{
 		.procname	= "mtu_expires",
 		.data		= &ip_rt_mtu_expires,
@@ -3705,7 +3658,6 @@ int __init ip_rt_init(void)
 		panic("IP: failed to allocate ipv4_dst_blackhole_ops counter\n");
 
 	ipv4_dst_ops.gc_thresh = ~0;
-	ip_rt_max_size = INT_MAX;
 
 	devinet_init();
 	ip_fib_init();
-- 
2.25.1