[DCCP] ackvec: Introduce dccp_ackvec_slab

Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 32 insertions, 2 deletions

diff --git a/net/dccp/ackvec.c b/net/dccp/ackvec.c
index 348374005db0..64408253b14e 100644
--- a/net/dccp/ackvec.c
+++ b/net/dccp/ackvec.c
@@ -13,10 +13,16 @@
 #include "dccp.h"
 
 #include <linux/dccp.h>
+#include <linux/init.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
 #include <linux/skbuff.h>
+#include <linux/slab.h>
 
 #include <net/sock.h>
 
+static kmem_cache_t *dccp_ackvec_slab;
+
 int dccp_insert_option_ackvec(struct sock *sk, struct sk_buff *skb)
 {
         struct dccp_sock *dp = dccp_sk(sk);
@@ -96,7 +102,7 @@ int dccp_insert_option_ackvec(struct sock *sk, struct sk_buff *skb)
 
 struct dccp_ackvec *dccp_ackvec_alloc(const gfp_t priority)
 {
-        struct dccp_ackvec *av = kmalloc(sizeof(*av), priority);
+        struct dccp_ackvec *av = kmem_cache_alloc(dccp_ackvec_slab, priority);
 
         if (av != NULL) {
                 av->dccpav_buf_head     =
@@ -115,7 +121,7 @@ struct dccp_ackvec *dccp_ackvec_alloc(const gfp_t priority)
 
 void dccp_ackvec_free(struct dccp_ackvec *av)
 {
-        kfree(av);
+        kmem_cache_free(dccp_ackvec_slab, av);
 }
 
 static inline u8 dccp_ackvec_state(const struct dccp_ackvec *av,
@@ -420,3 +426,27 @@ int dccp_ackvec_parse(struct sock *sk, const struct sk_buff *skb,
                                         len, value);
         return 0;
 }
+
+static char dccp_ackvec_slab_msg[] __initdata =
+        KERN_CRIT "DCCP: Unable to create ack vectors slab cache\n";
+
+int __init dccp_ackvec_init(void)
+{
+        dccp_ackvec_slab = kmem_cache_create("dccp_ackvec",
+                                             sizeof(struct dccp_ackvec), 0,
+                                             SLAB_HWCACHE_ALIGN, NULL, NULL);
+        if (dccp_ackvec_slab == NULL) {
+                printk(dccp_ackvec_slab_msg);
+                return -ENOBUFS;
+        }
+
+        return 0;
+}
+
+void dccp_ackvec_exit(void)
+{
+        if (dccp_ackvec_slab != NULL) {
+                kmem_cache_destroy(dccp_ackvec_slab);
+                dccp_ackvec_slab = NULL;
+        }
+}