summaryrefslogtreecommitdiffstats
path: root/include/linux/if_vlan.h
diff options
context:
space:
mode:
authorJesse Gross <jesse@nicira.com>2010-10-20 13:56:05 +0000
committerDavid S. Miller <davem@davemloft.net>2010-10-21 01:26:53 -0700
commit65ac6a5fa658b90f1be700c55e7cd72e4611015d (patch)
tree7330c3234101c6d4c952f4abec9c8064df0e685a /include/linux/if_vlan.h
parent7b9c60903714bf0a19d746b228864bad3497284e (diff)
downloadop-kernel-dev-65ac6a5fa658b90f1be700c55e7cd72e4611015d.zip
op-kernel-dev-65ac6a5fa658b90f1be700c55e7cd72e4611015d.tar.gz
vlan: Avoid hash table lookup to find group.
A struct net_device always maps to zero or one vlan groups and we always know the device when we are looking up a group. We currently do a hash table lookup on the device to find the group but it is much simpler to just store a pointer. Signed-off-by: Jesse Gross <jesse@nicira.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/linux/if_vlan.h')
-rw-r--r--include/linux/if_vlan.h19
1 files changed, 19 insertions, 0 deletions
diff --git a/include/linux/if_vlan.h b/include/linux/if_vlan.h
index 494cce8..4047781 100644
--- a/include/linux/if_vlan.h
+++ b/include/linux/if_vlan.h
@@ -16,6 +16,7 @@
#ifdef __KERNEL__
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
+#include <linux/rtnetlink.h>
#define VLAN_HLEN 4 /* The additional bytes (on top of the Ethernet header)
* that VLAN requires.
@@ -114,6 +115,18 @@ static inline void vlan_group_set_device(struct vlan_group *vg,
#define vlan_tx_tag_get(__skb) ((__skb)->vlan_tci & ~VLAN_TAG_PRESENT)
#if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE)
+/* Must be invoked with rcu_read_lock or with RTNL. */
+static inline struct net_device *vlan_find_dev(struct net_device *real_dev,
+ u16 vlan_id)
+{
+ struct vlan_group *grp = rcu_dereference_rtnl(real_dev->vlgrp);
+
+ if (grp)
+ return vlan_group_get_device(grp, vlan_id);
+
+ return NULL;
+}
+
extern struct net_device *vlan_dev_real_dev(const struct net_device *dev);
extern u16 vlan_dev_vlan_id(const struct net_device *dev);
@@ -128,6 +141,12 @@ vlan_gro_frags(struct napi_struct *napi, struct vlan_group *grp,
unsigned int vlan_tci);
#else
+static inline struct net_device *vlan_find_dev(struct net_device *real_dev,
+ u16 vlan_id)
+{
+ return NULL;
+}
+
static inline struct net_device *vlan_dev_real_dev(const struct net_device *dev)
{
BUG();
OpenPOWER on IntegriCloud