inet: frags: use kmem_cache for inet_frag_queue

Use kmem_cache to allocate/free inet_frag_queue objects since they're
all the same size per inet_frags user and are alloced/freed in high volumes
thus making it a perfect case for kmem_cache.

Signed-off-by: Nikolay Aleksandrov <nikolay@redhat.com>
Acked-by: Florian Westphal <fw@strlen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 14 insertions, 4 deletions

diff --git a/net/ipv4/inet_fragment.c b/net/ipv4/inet_fragment.c
index 4baa76c60398..9eb89f3f0ee4 100644
--- a/net/ipv4/inet_fragment.c
+++ b/net/ipv4/inet_fragment.c
@@ -198,7 +198,7 @@ static void inet_frag_schedule_worker(struct inet_frags *f)
                 schedule_work(&f->frags_work);
 }
 
-void inet_frags_init(struct inet_frags *f)
+int inet_frags_init(struct inet_frags *f)
 {
         int i;
 
@@ -213,6 +213,12 @@ void inet_frags_init(struct inet_frags *f)
 
         seqlock_init(&f->rnd_seqlock);
         f->last_rebuild_jiffies = 0;
+        f->frags_cachep = kmem_cache_create(f->frags_cache_name, f->qsize, 0, 0,
+                                            NULL);
+        if (!f->frags_cachep)
+                return -ENOMEM;
+
+        return 0;
 }
 EXPORT_SYMBOL(inet_frags_init);
 
@@ -225,6 +231,7 @@ EXPORT_SYMBOL(inet_frags_init_net);
 void inet_frags_fini(struct inet_frags *f)
 {
         cancel_work_sync(&f->frags_work);
+        kmem_cache_destroy(f->frags_cachep);
 }
 EXPORT_SYMBOL(inet_frags_fini);
 
@@ -327,7 +334,7 @@ void inet_frag_destroy(struct inet_frag_queue *q, struct inet_frags *f)
 
         if (f->destructor)
                 f->destructor(q);
-        kfree(q);
+        kmem_cache_free(f->frags_cachep, q);
 }
 EXPORT_SYMBOL(inet_frag_destroy);
 
@@ -377,7 +384,7 @@ static struct inet_frag_queue *inet_frag_alloc(struct netns_frags *nf,
                 return NULL;
         }
 
-        q = kzalloc(f->qsize, GFP_ATOMIC);
+        q = kmem_cache_zalloc(f->frags_cachep, GFP_ATOMIC);
         if (q == NULL)
                 return NULL;
 
diff --git a/net/ipv4/ip_fragment.c b/net/ipv4/ip_fragment.c
index cb56bcc1eee2..15f0e2bad7ad 100644
--- a/net/ipv4/ip_fragment.c
+++ b/net/ipv4/ip_fragment.c
@@ -55,6 +55,7 @@
  */
 
 static int sysctl_ipfrag_max_dist __read_mostly = 64;
+static const char ip_frag_cache_name[] = "ip4-frags";
 
 struct ipfrag_skb_cb
 {
@@ -860,5 +861,7 @@ void __init ipfrag_init(void)
         ip4_frags.qsize = sizeof(struct ipq);
         ip4_frags.match = ip4_frag_match;
         ip4_frags.frag_expire = ip_expire;
-        inet_frags_init(&ip4_frags);
+        ip4_frags.frags_cache_name = ip_frag_cache_name;
+        if (inet_frags_init(&ip4_frags))
+                panic("IP: failed to allocate ip4_frags cache\n");
 }