[PATCH v7 15/16] openvswitch: use new hashtable implementation

Sasha Levin
2012-10-28T19:04:05Z

Switch openvswitch to use the new hashtable implementation. This reduces the amount of
generic unrelated code in openvswitch.

Signed-off-by: Sasha Levin <levinsasha928@gmail.com>
---
net/openvswitch/vport.c | 34 +++++++++++++---------------------
1 file changed, 13 insertions(+), 21 deletions(-)

diff --git a/net/openvswitch/vport.c b/net/openvswitch/vport.c
index 03779e8..3cb9caa 100644
--- a/net/openvswitch/vport.c
+++ b/net/openvswitch/vport.c
@@ -28,6 +28,7 @@
#include <linux/rtnetlink.h>
#include <linux/compat.h>
#include <net/net_namespace.h>
+#include <linux/hashtable.h>

#include "datapath.h"
#include "vport.h"
@@ -41,8 +42,8 @@ static const struct vport_ops *vport_ops_list[] = {
};

/* Protected by RCU read lock for reading, RTNL lock for writing. */
-static struct hlist_head *dev_table;
-#define VPORT_HASH_BUCKETS 1024
+#define VPORT_HASH_BITS 10
+static DEFINE_HASHTABLE(dev_table, VPORT_HASH_BITS);

/**
* ovs_vport_init - initialize vport subsystem
@@ -51,10 +52,7 @@ static struct hlist_head *dev_table;
*/
int ovs_vport_init(void)
{
- dev_table = kzalloc(VPORT_HASH_BUCKETS * sizeof(struct hlist_head),
- GFP_KERNEL);
- if (!dev_table)
- return -ENOMEM;
+ hash_init(dev_table);

return 0;
}
@@ -69,12 +67,6 @@ void ovs_vport_exit(void)
kfree(dev_table);
}

-static struct hlist_head *hash_bucket(struct net *net, const char *name)
-{
- unsigned int hash = jhash(name, strlen(name), (unsigned long) net);
- return &dev_table[hash & (VPORT_HASH_BUCKETS - 1)];
-}
-
/**
* ovs_vport_locate - find a port that has already been created
*
@@ -84,13 +76,12 @@ static struct hlist_head *hash_bucket(struct net *net, const char *name)
*/
struct vport *ovs_vport_locate(struct net *net, const char *name)
{
- struct hlist_head *bucket = hash_bucket(net, name);
struct vport *vport;
struct hlist_node *node;
+ int key = full_name_hash(name, strlen(name));

- hlist_for_each_entry_rcu(vport, node, bucket, hash_node)
- if (!strcmp(name, vport->ops->get_name(vport)) &&
- net_eq(ovs_dp_get_net(vport->dp), net))
+ hash_for_each_possible_rcu(dev_table, vport, node, hash_node, key)
+ if (!strcmp(name, vport->ops->get_name(vport)))
return vport;

return NULL;
@@ -174,7 +165,8 @@ struct vport *ovs_vport_add(const struct vport_parms *parms)

for (i = 0; i < ARRAY_SIZE(vport_ops_list); i++) {
if (vport_ops_list[i]->type == parms->type) {
- struct hlist_head *bucket;
+ int key;
+ const char *name;

vport = vport_ops_list[i]->create(parms);
if (IS_ERR(vport)) {
@@ -182,9 +174,9 @@ struct vport *ovs_vport_add(const struct vport_parms *parms)
goto out;
}

- bucket = hash_bucket(ovs_dp_get_net(vport->dp),
- vport->ops->get_name(vport));
- hlist_add_head_rcu(&vport->hash_node, bucket);
+ name = vport->ops->get_name(vport);
+ key = full_name_hash(name, strlen(name));
+ hash_add_rcu(dev_table, &vport->hash_node, key);
return vport;
}
}
@@ -225,7 +217,7 @@ void ovs_vport_del(struct vport *vport)
{
ASSERT_RTNL();

- hlist_del_rcu(&vport->hash_node);
+ hash_del_rcu(&vport->hash_node);

vport->ops->destroy(vport);
}
--
1.7.12.4