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Index: head/sys/netinet/tcp_hostcache.c
===================================================================
--- head/sys/netinet/tcp_hostcache.c
+++ head/sys/netinet/tcp_hostcache.c
@@ -124,6 +124,12 @@
static SYSCTL_NODE(_net_inet_tcp, OID_AUTO, hostcache, CTLFLAG_RW, 0,
"TCP Host cache");
+VNET_DEFINE(int, tcp_use_hostcache) = 1;
+#define V_tcp_use_hostcache VNET(tcp_use_hostcache)
+SYSCTL_INT(_net_inet_tcp_hostcache, OID_AUTO, enable, CTLFLAG_VNET | CTLFLAG_RW,
+ &VNET_NAME(tcp_use_hostcache), 0,
+ "Enable the TCP hostcache");
+
SYSCTL_UINT(_net_inet_tcp_hostcache, OID_AUTO, cachelimit, CTLFLAG_VNET | CTLFLAG_RDTUN,
&VNET_NAME(tcp_hostcache.cache_limit), 0,
"Overall entry limit for hostcache");
@@ -276,6 +282,9 @@
struct hc_head *hc_head;
struct hc_metrics *hc_entry;
+ if (!V_tcp_use_hostcache)
+ return NULL;
+
KASSERT(inc != NULL, ("tcp_hc_lookup with NULL in_conninfo pointer"));
/*
@@ -332,6 +341,9 @@
struct hc_head *hc_head;
struct hc_metrics *hc_entry;
+ if (!V_tcp_use_hostcache)
+ return NULL;
+
KASSERT(inc != NULL, ("tcp_hc_insert with NULL in_conninfo pointer"));
/*
@@ -421,6 +433,9 @@
{
struct hc_metrics *hc_entry;
+ if (!V_tcp_use_hostcache)
+ return;
+
/*
* Find the right bucket.
*/
@@ -452,7 +467,7 @@
/*
* External function: look up an entry in the hostcache and return the
- * discovered path MTU. Returns NULL if no entry is found or value is not
+ * discovered path MTU. Returns 0 if no entry is found or value is not
* set.
*/
u_long
@@ -461,6 +476,9 @@
struct hc_metrics *hc_entry;
u_long mtu;
+ if (!V_tcp_use_hostcache)
+ return 0;
+
hc_entry = tcp_hc_lookup(inc);
if (hc_entry == NULL) {
return 0;
@@ -482,6 +500,9 @@
{
struct hc_metrics *hc_entry;
+ if (!V_tcp_use_hostcache)
+ return;
+
/*
* Find the right bucket.
*/
@@ -521,6 +542,9 @@
{
struct hc_metrics *hc_entry;
+ if (!V_tcp_use_hostcache)
+ return;
+
hc_entry = tcp_hc_lookup(inc);
if (hc_entry == NULL) {
hc_entry = tcp_hc_insert(inc);

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