diff options
author | Jiri Pirko <jpirko@redhat.com> | 2011-12-08 04:11:18 +0000 |
---|---|---|
committer | David S. Miller <davem@davemloft.net> | 2011-12-08 19:52:42 -0500 |
commit | 5b9ea6e022e9ba0fe39cb349ac40361f78d5da5b (patch) | |
tree | 11f0de492ee799fd4174f79ac6aae4c3533beb25 /net/8021q/vlan_core.c | |
parent | 87002b03baabd2b8f6281ab6411ed88d24958de1 (diff) | |
download | linux-5b9ea6e022e9ba0fe39cb349ac40361f78d5da5b.tar.bz2 |
vlan: introduce vid list with reference counting
This allows to keep track of vids needed to be in rx vlan filters of
devices even if they are used in bond/team etc.
vlan_info as well as vlan_group previously was, is allocated when first
vid is added and dealocated whan last vid is deleted.
vlan_group definition is moved to private header.
Signed-off-by: Jiri Pirko <jpirko@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/8021q/vlan_core.c')
-rw-r--r-- | net/8021q/vlan_core.c | 168 |
1 files changed, 160 insertions, 8 deletions
diff --git a/net/8021q/vlan_core.c b/net/8021q/vlan_core.c index 544f9cb9678c..329e0313e01f 100644 --- a/net/8021q/vlan_core.c +++ b/net/8021q/vlan_core.c @@ -71,10 +71,10 @@ bool vlan_do_receive(struct sk_buff **skbp, bool last_handler) struct net_device *__vlan_find_dev_deep(struct net_device *real_dev, u16 vlan_id) { - struct vlan_group *grp = rcu_dereference_rtnl(real_dev->vlgrp); + struct vlan_info *vlan_info = rcu_dereference_rtnl(real_dev->vlan_info); - if (grp) { - return vlan_group_get_device(grp, vlan_id); + if (vlan_info) { + return vlan_group_get_device(&vlan_info->grp, vlan_id); } else { /* * Bonding slaves do not have grp assigned to themselves. @@ -147,25 +147,177 @@ err_free: return NULL; } -int vlan_vid_add(struct net_device *dev, unsigned short vid) + +/* + * vlan info and vid list + */ + +static void vlan_group_free(struct vlan_group *grp) +{ + int i; + + for (i = 0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++) + kfree(grp->vlan_devices_arrays[i]); +} + +static void vlan_info_free(struct vlan_info *vlan_info) +{ + vlan_group_free(&vlan_info->grp); + kfree(vlan_info); +} + +static void vlan_info_rcu_free(struct rcu_head *rcu) +{ + vlan_info_free(container_of(rcu, struct vlan_info, rcu)); +} + +static struct vlan_info *vlan_info_alloc(struct net_device *dev) +{ + struct vlan_info *vlan_info; + + vlan_info = kzalloc(sizeof(struct vlan_info), GFP_KERNEL); + if (!vlan_info) + return NULL; + + vlan_info->real_dev = dev; + INIT_LIST_HEAD(&vlan_info->vid_list); + return vlan_info; +} + +struct vlan_vid_info { + struct list_head list; + unsigned short vid; + int refcount; +}; + +static struct vlan_vid_info *vlan_vid_info_get(struct vlan_info *vlan_info, + unsigned short vid) +{ + struct vlan_vid_info *vid_info; + + list_for_each_entry(vid_info, &vlan_info->vid_list, list) { + if (vid_info->vid == vid) + return vid_info; + } + return NULL; +} + +static struct vlan_vid_info *vlan_vid_info_alloc(unsigned short vid) +{ + struct vlan_vid_info *vid_info; + + vid_info = kzalloc(sizeof(struct vlan_vid_info), GFP_KERNEL); + if (!vid_info) + return NULL; + vid_info->vid = vid; + + return vid_info; +} + +static int __vlan_vid_add(struct vlan_info *vlan_info, unsigned short vid, + struct vlan_vid_info **pvid_info) { + struct net_device *dev = vlan_info->real_dev; const struct net_device_ops *ops = dev->netdev_ops; + struct vlan_vid_info *vid_info; + int err; + + vid_info = vlan_vid_info_alloc(vid); + if (!vid_info) + return -ENOMEM; if ((dev->features & NETIF_F_HW_VLAN_FILTER) && - ops->ndo_vlan_rx_add_vid) { - return ops->ndo_vlan_rx_add_vid(dev, vid); + ops->ndo_vlan_rx_add_vid) { + err = ops->ndo_vlan_rx_add_vid(dev, vid); + if (err) { + kfree(vid_info); + return err; + } } + list_add(&vid_info->list, &vlan_info->vid_list); + vlan_info->nr_vids++; + *pvid_info = vid_info; return 0; } + +int vlan_vid_add(struct net_device *dev, unsigned short vid) +{ + struct vlan_info *vlan_info; + struct vlan_vid_info *vid_info; + bool vlan_info_created = false; + int err; + + ASSERT_RTNL(); + + vlan_info = rtnl_dereference(dev->vlan_info); + if (!vlan_info) { + vlan_info = vlan_info_alloc(dev); + if (!vlan_info) + return -ENOMEM; + vlan_info_created = true; + } + vid_info = vlan_vid_info_get(vlan_info, vid); + if (!vid_info) { + err = __vlan_vid_add(vlan_info, vid, &vid_info); + if (err) + goto out_free_vlan_info; + } + vid_info->refcount++; + + if (vlan_info_created) + rcu_assign_pointer(dev->vlan_info, vlan_info); + + return 0; + +out_free_vlan_info: + if (vlan_info_created) + kfree(vlan_info); + return err; +} EXPORT_SYMBOL(vlan_vid_add); -void vlan_vid_del(struct net_device *dev, unsigned short vid) +static void __vlan_vid_del(struct vlan_info *vlan_info, + struct vlan_vid_info *vid_info) { + struct net_device *dev = vlan_info->real_dev; const struct net_device_ops *ops = dev->netdev_ops; + unsigned short vid = vid_info->vid; + int err; if ((dev->features & NETIF_F_HW_VLAN_FILTER) && ops->ndo_vlan_rx_kill_vid) { - ops->ndo_vlan_rx_kill_vid(dev, vid); + err = ops->ndo_vlan_rx_kill_vid(dev, vid); + if (err) { + pr_warn("failed to kill vid %d for device %s\n", + vid, dev->name); + } + } + list_del(&vid_info->list); + kfree(vid_info); + vlan_info->nr_vids--; +} + +void vlan_vid_del(struct net_device *dev, unsigned short vid) +{ + struct vlan_info *vlan_info; + struct vlan_vid_info *vid_info; + + ASSERT_RTNL(); + + vlan_info = rtnl_dereference(dev->vlan_info); + if (!vlan_info) + return; + + vid_info = vlan_vid_info_get(vlan_info, vid); + if (!vid_info) + return; + vid_info->refcount--; + if (vid_info->refcount == 0) { + __vlan_vid_del(vlan_info, vid_info); + if (vlan_info->nr_vids == 0) { + RCU_INIT_POINTER(dev->vlan_info, NULL); + call_rcu(&vlan_info->rcu, vlan_info_rcu_free); + } } } EXPORT_SYMBOL(vlan_vid_del); |