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vlan: introduce vid list with reference counting

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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>
This commit is contained in:
Jiri Pirko 2011-12-08 04:11:18 +00:00 committed by David S. Miller
parent 87002b03ba
commit 5b9ea6e022
5 changed files with 219 additions and 89 deletions
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17
include/linux/if_vlan.h
View File

@ -74,22 +74,7 @@ static inline struct vlan_ethhdr *vlan_eth_hdr(const struct sk_buff *skb)
/* found in socket.c */
extern void vlan_ioctl_set(int (*hook)(struct net *, void __user *));
/* if this changes, algorithm will have to be reworked because this
* depends on completely exhausting the VLAN identifier space. Thus
* it gives constant time look-up, but in many cases it wastes memory.
*/
#define VLAN_GROUP_ARRAY_SPLIT_PARTS 8
#define VLAN_GROUP_ARRAY_PART_LEN (VLAN_N_VID/VLAN_GROUP_ARRAY_SPLIT_PARTS)
struct vlan_group {
struct net_device *real_dev; /* The ethernet(like) device
* the vlan is attached to.
*/
unsigned int nr_vlans;
struct hlist_node hlist; /* linked list */
struct net_device **vlan_devices_arrays[VLAN_GROUP_ARRAY_SPLIT_PARTS];
struct rcu_head rcu;
};
struct vlan_info;
static inline int is_vlan_dev(struct net_device *dev)
{

3
include/linux/netdevice.h
View File

@ -55,7 +55,6 @@
#include <linux/netdev_features.h>
struct vlan_group;
struct netpoll_info;
struct phy_device;
/* 802.11 specific */
@ -1096,7 +1095,7 @@ struct net_device {
/* Protocol specific pointers */
#if IS_ENABLED(CONFIG_VLAN_8021Q)
struct vlan_group __rcu *vlgrp; /* VLAN group */
struct vlan_info __rcu *vlan_info; /* VLAN info */
#endif
#if IS_ENABLED(CONFIG_NET_DSA)
struct dsa_switch_tree *dsa_ptr; /* dsa specific data */

90
net/8021q/vlan.c
View File

@ -51,27 +51,6 @@ const char vlan_version[] = DRV_VERSION;
/* End of global variables definitions. */
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]);
kfree(grp);
}
static struct vlan_group *vlan_group_alloc(struct net_device *real_dev)
{
struct vlan_group *grp;
grp = kzalloc(sizeof(struct vlan_group), GFP_KERNEL);
if (!grp)
return NULL;
grp->real_dev = real_dev;
return grp;
}
static int vlan_group_prealloc_vid(struct vlan_group *vg, u16 vlan_id)
{
struct net_device **array;
@ -92,22 +71,20 @@ static int vlan_group_prealloc_vid(struct vlan_group *vg, u16 vlan_id)
return 0;
}
static void vlan_rcu_free(struct rcu_head *rcu)
{
vlan_group_free(container_of(rcu, struct vlan_group, rcu));
}
void unregister_vlan_dev(struct net_device *dev, struct list_head *head)
{
struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
struct net_device *real_dev = vlan->real_dev;
struct vlan_info *vlan_info;
struct vlan_group *grp;
u16 vlan_id = vlan->vlan_id;
ASSERT_RTNL();
grp = rtnl_dereference(real_dev->vlgrp);
BUG_ON(!grp);
vlan_info = rtnl_dereference(real_dev->vlan_info);
BUG_ON(!vlan_info);
grp = &vlan_info->grp;
/* Take it out of our own structures, but be sure to interlock with
* HW accelerating devices or SW vlan input packet processing if
@ -116,7 +93,7 @@ void unregister_vlan_dev(struct net_device *dev, struct list_head *head)
if (vlan_id)
vlan_vid_del(real_dev, vlan_id);
grp->nr_vlans--;
grp->nr_vlan_devs--;
if (vlan->flags & VLAN_FLAG_GVRP)
vlan_gvrp_request_leave(dev);
@ -128,16 +105,9 @@ void unregister_vlan_dev(struct net_device *dev, struct list_head *head)
*/
unregister_netdevice_queue(dev, head);
/* If the group is now empty, kill off the group. */
if (grp->nr_vlans == 0) {
if (grp->nr_vlan_devs == 0)
vlan_gvrp_uninit_applicant(real_dev);
RCU_INIT_POINTER(real_dev->vlgrp, NULL);
/* Free the group, after all cpu's are done. */
call_rcu(&grp->rcu, vlan_rcu_free);
}
/* Get rid of the vlan's reference to real_dev */
dev_put(real_dev);
}
@ -169,17 +139,23 @@ int register_vlan_dev(struct net_device *dev)
struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
struct net_device *real_dev = vlan->real_dev;
u16 vlan_id = vlan->vlan_id;
struct vlan_group *grp, *ngrp = NULL;
struct vlan_info *vlan_info;
struct vlan_group *grp;
int err;
grp = rtnl_dereference(real_dev->vlgrp);
if (!grp) {
ngrp = grp = vlan_group_alloc(real_dev);
if (!grp)
return -ENOBUFS;
err = vlan_vid_add(real_dev, vlan_id);
if (err)
return err;
vlan_info = rtnl_dereference(real_dev->vlan_info);
/* vlan_info should be there now. vlan_vid_add took care of it */
BUG_ON(!vlan_info);
grp = &vlan_info->grp;
if (grp->nr_vlan_devs == 0) {
err = vlan_gvrp_init_applicant(real_dev);
if (err < 0)
goto out_free_group;
goto out_vid_del;
}
err = vlan_group_prealloc_vid(grp, vlan_id);
@ -200,23 +176,15 @@ int register_vlan_dev(struct net_device *dev)
* it into our local structure.
*/
vlan_group_set_device(grp, vlan_id, dev);
grp->nr_vlans++;
if (ngrp) {
rcu_assign_pointer(real_dev->vlgrp, ngrp);
}
vlan_vid_add(real_dev, vlan_id);
grp->nr_vlan_devs++;
return 0;
out_uninit_applicant:
if (ngrp)
if (grp->nr_vlan_devs == 0)
vlan_gvrp_uninit_applicant(real_dev);
out_free_group:
if (ngrp) {
/* Free the group, after all cpu's are done. */
call_rcu(&ngrp->rcu, vlan_rcu_free);
}
out_vid_del:
vlan_vid_del(real_dev, vlan_id);
return err;
}
@ -357,6 +325,7 @@ static int vlan_device_event(struct notifier_block *unused, unsigned long event,
{
struct net_device *dev = ptr;
struct vlan_group *grp;
struct vlan_info *vlan_info;
int i, flgs;
struct net_device *vlandev;
struct vlan_dev_priv *vlan;
@ -372,9 +341,10 @@ static int vlan_device_event(struct notifier_block *unused, unsigned long event,
vlan_vid_add(dev, 0);
}
grp = rtnl_dereference(dev->vlgrp);
if (!grp)
vlan_info = rtnl_dereference(dev->vlan_info);
if (!vlan_info)
goto out;
grp = &vlan_info->grp;
/* It is OK that we do not hold the group lock right now,
* as we run under the RTNL lock.
@ -478,9 +448,9 @@ static int vlan_device_event(struct notifier_block *unused, unsigned long event,
if (!vlandev)
continue;
/* unregistration of last vlan destroys group, abort
/* removal of last vid destroys vlan_info, abort
* afterwards */
if (grp->nr_vlans == 1)
if (vlan_info->nr_vids == 1)
i = VLAN_N_VID;
unregister_vlan_dev(vlandev, &list);

30
net/8021q/vlan.h
View File

@ -3,6 +3,7 @@
#include <linux/if_vlan.h>
#include <linux/u64_stats_sync.h>
#include <linux/list.h>
/**
@ -74,6 +75,29 @@ static inline struct vlan_dev_priv *vlan_dev_priv(const struct net_device *dev)
return netdev_priv(dev);
}
/* if this changes, algorithm will have to be reworked because this
* depends on completely exhausting the VLAN identifier space. Thus
* it gives constant time look-up, but in many cases it wastes memory.
*/
#define VLAN_GROUP_ARRAY_SPLIT_PARTS 8
#define VLAN_GROUP_ARRAY_PART_LEN (VLAN_N_VID/VLAN_GROUP_ARRAY_SPLIT_PARTS)
struct vlan_group {
unsigned int nr_vlan_devs;
struct hlist_node hlist; /* linked list */
struct net_device **vlan_devices_arrays[VLAN_GROUP_ARRAY_SPLIT_PARTS];
};
struct vlan_info {
struct net_device *real_dev; /* The ethernet(like) device
* the vlan is attached to.
*/
struct vlan_group grp;
struct list_head vid_list;
unsigned int nr_vids;
struct rcu_head rcu;
};
static inline struct net_device *vlan_group_get_device(struct vlan_group *vg,
u16 vlan_id)
{
@ -97,10 +121,10 @@ static inline void vlan_group_set_device(struct vlan_group *vg,
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);
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);
return NULL;
}

168
net/8021q/vlan_core.c
View File

@ -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);