xfrm: Remove caching of xfrm_policy_sk_bundles

We currently cache socket policy bundles at xfrm_policy_sk_bundles.
These cached bundles are never used. Instead we create and cache
a new one whenever xfrm_lookup() is called on a socket policy.

Most protocols cache the used routes to the socket, so let's
remove the unused caching of socket policy bundles in xfrm.

Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>

2 files changed, 0 insertions, 29 deletions

diff --git a/include/net/netns/xfrm.h b/include/net/netns/xfrm.h
index 52d0086d55d3..51f0dce7b643 100644
--- a/include/net/netns/xfrm.h
+++ b/include/net/netns/xfrm.h
@@ -59,7 +59,6 @@ struct netns_xfrm {
         struct dst_ops          xfrm6_dst_ops;
 #endif
         spinlock_t xfrm_state_lock;
-        spinlock_t xfrm_policy_sk_bundle_lock;
         rwlock_t xfrm_policy_lock;
         struct mutex xfrm_cfg_mutex;
 
diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c
index 2232c6f26aff..bb3669d973a7 100644
--- a/net/xfrm/xfrm_policy.c
+++ b/net/xfrm/xfrm_policy.c
@@ -39,8 +39,6 @@
 #define XFRM_QUEUE_TMO_MAX ((unsigned)(60*HZ))
 #define XFRM_MAX_QUEUE_LEN      100
 
-static struct dst_entry *xfrm_policy_sk_bundles;
-
 static DEFINE_SPINLOCK(xfrm_policy_afinfo_lock);
 static struct xfrm_policy_afinfo __rcu *xfrm_policy_afinfo[NPROTO]
                                                 __read_mostly;
@@ -2109,13 +2107,6 @@ struct dst_entry *xfrm_lookup(struct net *net, struct dst_entry *dst_orig,
                                 goto no_transform;
                         }
 
-                        dst_hold(&xdst->u.dst);
-
-                        spin_lock_bh(&net->xfrm.xfrm_policy_sk_bundle_lock);
-                        xdst->u.dst.next = xfrm_policy_sk_bundles;
-                        xfrm_policy_sk_bundles = &xdst->u.dst;
-                        spin_unlock_bh(&net->xfrm.xfrm_policy_sk_bundle_lock);
-
                         route = xdst->route;
                 }
         }
@@ -2549,33 +2540,15 @@ static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst)
         return dst;
 }
 
-static void __xfrm_garbage_collect(struct net *net)
-{
-        struct dst_entry *head, *next;
-
-        spin_lock_bh(&net->xfrm.xfrm_policy_sk_bundle_lock);
-        head = xfrm_policy_sk_bundles;
-        xfrm_policy_sk_bundles = NULL;
-        spin_unlock_bh(&net->xfrm.xfrm_policy_sk_bundle_lock);
-
-        while (head) {
-                next = head->next;
-                dst_free(head);
-                head = next;
-        }
-}
-
 void xfrm_garbage_collect(struct net *net)
 {
         flow_cache_flush(net);
-        __xfrm_garbage_collect(net);
 }
 EXPORT_SYMBOL(xfrm_garbage_collect);
 
 static void xfrm_garbage_collect_deferred(struct net *net)
 {
         flow_cache_flush_deferred(net);
-        __xfrm_garbage_collect(net);
 }
 
 static void xfrm_init_pmtu(struct dst_entry *dst)
@@ -2944,7 +2917,6 @@ static int __net_init xfrm_net_init(struct net *net)
         /* Initialize the per-net locks here */
         spin_lock_init(&net->xfrm.xfrm_state_lock);
         rwlock_init(&net->xfrm.xfrm_policy_lock);
-        spin_lock_init(&net->xfrm.xfrm_policy_sk_bundle_lock);
         mutex_init(&net->xfrm.xfrm_cfg_mutex);
 
         flow_cache_init(net);