xfrm: remove flow cache

After rcu conversions performance degradation in forward tests isn't that
noticeable anymore.

See next patch for some numbers.

A followup patcg could then also remove genid from the policies
as we do not cache bundles anymore.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

4 files changed, 0 insertions, 78 deletions

diff --git a/include/net/flow.h b/include/net/flow.h
index bae198b3039e..f3dc61b29bb5 100644
--- a/include/net/flow.h
+++ b/include/net/flow.h
@@ -218,40 +218,6 @@ static inline unsigned int flow_key_size(u16 family)
 	return 0;
 }
 
-#define FLOW_DIR_IN	0
-#define FLOW_DIR_OUT	1
-#define FLOW_DIR_FWD	2
-
-struct net;
-struct sock;
-struct flow_cache_ops;
-
-struct flow_cache_object {
-	const struct flow_cache_ops *ops;
-};
-
-struct flow_cache_ops {
-	struct flow_cache_object *(*get)(struct flow_cache_object *);
-	int (*check)(struct flow_cache_object *);
-	void (*delete)(struct flow_cache_object *);
-};
-
-typedef struct flow_cache_object *(*flow_resolve_t)(
-		struct net *net, const struct flowi *key, u16 family,
-		u8 dir, struct flow_cache_object *oldobj, void *ctx);
-
-struct flow_cache_object *flow_cache_lookup(struct net *net,
-					    const struct flowi *key, u16 family,
-					    u8 dir, flow_resolve_t resolver,
-					    void *ctx);
-int flow_cache_init(struct net *net);
-void flow_cache_fini(struct net *net);
-void flow_cache_hp_init(void);
-
-void flow_cache_flush(struct net *net);
-void flow_cache_flush_deferred(struct net *net);
-extern atomic_t flow_cache_genid;
-
 __u32 __get_hash_from_flowi6(const struct flowi6 *fl6, struct flow_keys *keys);
 
 static inline __u32 get_hash_from_flowi6(const struct flowi6 *fl6)
diff --git a/include/net/flowcache.h b/include/net/flowcache.h
deleted file mode 100644
index 51eb971e8973..000000000000
--- a/include/net/flowcache.h
+++ /dev/null
@@ -1,25 +0,0 @@
-#ifndef _NET_FLOWCACHE_H
-#define _NET_FLOWCACHE_H
-
-#include <linux/interrupt.h>
-#include <linux/types.h>
-#include <linux/timer.h>
-#include <linux/notifier.h>
-
-struct flow_cache_percpu {
-	struct hlist_head		*hash_table;
-	unsigned int			hash_count;
-	u32				hash_rnd;
-	int				hash_rnd_recalc;
-	struct tasklet_struct		flush_tasklet;
-};
-
-struct flow_cache {
-	u32				hash_shift;
-	struct flow_cache_percpu __percpu *percpu;
-	struct hlist_node		node;
-	unsigned int			low_watermark;
-	unsigned int			high_watermark;
-	struct timer_list		rnd_timer;
-};
-#endif	/* _NET_FLOWCACHE_H */
diff --git a/include/net/netns/xfrm.h b/include/net/netns/xfrm.h
index 27bb9633c69d..611521646dd4 100644
--- a/include/net/netns/xfrm.h
+++ b/include/net/netns/xfrm.h
@@ -6,7 +6,6 @@
 #include <linux/workqueue.h>
 #include <linux/xfrm.h>
 #include <net/dst_ops.h>
-#include <net/flowcache.h>
 
 struct ctl_table_header;
 
@@ -73,16 +72,6 @@ struct netns_xfrm {
 	spinlock_t xfrm_state_lock;
 	spinlock_t xfrm_policy_lock;
 	struct mutex xfrm_cfg_mutex;
-
-	/* flow cache part */
-	struct flow_cache	flow_cache_global;
-	atomic_t		flow_cache_genid;
-	struct list_head	flow_cache_gc_list;
-	atomic_t		flow_cache_gc_count;
-	spinlock_t		flow_cache_gc_lock;
-	struct work_struct	flow_cache_gc_work;
-	struct work_struct	flow_cache_flush_work;
-	struct mutex		flow_flush_sem;
 };
 
 #endif
diff --git a/include/net/xfrm.h b/include/net/xfrm.h
index c0916ab18d32..e0feba2ce76a 100644
--- a/include/net/xfrm.h
+++ b/include/net/xfrm.h
@@ -563,7 +563,6 @@ struct xfrm_policy {
 	refcount_t		refcnt;
 	struct timer_list	timer;
 
-	struct flow_cache_object flo;
 	atomic_t		genid;
 	u32			priority;
 	u32			index;
@@ -978,7 +977,6 @@ struct xfrm_dst {
 		struct rt6_info		rt6;
 	} u;
 	struct dst_entry *route;
-	struct flow_cache_object flo;
 	struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
 	int num_pols, num_xfrms;
 	u32 xfrm_genid;
@@ -1226,9 +1224,6 @@ static inline void xfrm_sk_free_policy(struct sock *sk)
 	}
 }
 
-void xfrm_garbage_collect(struct net *net);
-void xfrm_garbage_collect_deferred(struct net *net);
-
 #else
 
 static inline void xfrm_sk_free_policy(struct sock *sk) {}
@@ -1263,9 +1258,6 @@ static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
 {
 	return 1;
 }
-static inline void xfrm_garbage_collect(struct net *net)
-{
-}
 #endif
 
 static __inline__