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https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-26 05:34:13 +08:00
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>
This commit is contained in:
Jiri Pirko
David S. Miller
parent
87002b03ba
commit
5b9ea6e022
@ -74,22 +74,7 @@ static inline struct vlan_ethhdr *vlan_eth_hdr(const struct sk_buff *skb)
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/* found in socket.c */
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extern void vlan_ioctl_set(int (*hook)(struct net *, void __user *));
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/* if this changes, algorithm will have to be reworked because this
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* depends on completely exhausting the VLAN identifier space. Thus
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* it gives constant time look-up, but in many cases it wastes memory.
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*/
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#define VLAN_GROUP_ARRAY_SPLIT_PARTS 8
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#define VLAN_GROUP_ARRAY_PART_LEN (VLAN_N_VID/VLAN_GROUP_ARRAY_SPLIT_PARTS)
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struct vlan_group {
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struct net_device *real_dev; /* The ethernet(like) device
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* the vlan is attached to.
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*/
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unsigned int nr_vlans;
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struct hlist_node hlist; /* linked list */
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struct net_device **vlan_devices_arrays[VLAN_GROUP_ARRAY_SPLIT_PARTS];
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struct rcu_head rcu;
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};
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struct vlan_info;
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static inline int is_vlan_dev(struct net_device *dev)
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{
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@ -55,7 +55,6 @@
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#include <linux/netdev_features.h>
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struct vlan_group;
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struct netpoll_info;
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struct phy_device;
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/* 802.11 specific */
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@ -1096,7 +1095,7 @@ struct net_device {
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/* Protocol specific pointers */
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#if IS_ENABLED(CONFIG_VLAN_8021Q)
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struct vlan_group __rcu *vlgrp; /* VLAN group */
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struct vlan_info __rcu *vlan_info; /* VLAN info */
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#endif
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#if IS_ENABLED(CONFIG_NET_DSA)
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struct dsa_switch_tree *dsa_ptr; /* dsa specific data */
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@ -51,27 +51,6 @@ const char vlan_version[] = DRV_VERSION;
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/* End of global variables definitions. */
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static void vlan_group_free(struct vlan_group *grp)
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{
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int i;
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for (i = 0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++)
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kfree(grp->vlan_devices_arrays[i]);
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kfree(grp);
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}
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static struct vlan_group *vlan_group_alloc(struct net_device *real_dev)
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{
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struct vlan_group *grp;
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grp = kzalloc(sizeof(struct vlan_group), GFP_KERNEL);
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if (!grp)
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return NULL;
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grp->real_dev = real_dev;
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return grp;
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}
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static int vlan_group_prealloc_vid(struct vlan_group *vg, u16 vlan_id)
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{
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struct net_device **array;
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@ -92,22 +71,20 @@ static int vlan_group_prealloc_vid(struct vlan_group *vg, u16 vlan_id)
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return 0;
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}
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static void vlan_rcu_free(struct rcu_head *rcu)
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{
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vlan_group_free(container_of(rcu, struct vlan_group, rcu));
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}
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void unregister_vlan_dev(struct net_device *dev, struct list_head *head)
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{
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struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
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struct net_device *real_dev = vlan->real_dev;
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struct vlan_info *vlan_info;
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struct vlan_group *grp;
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u16 vlan_id = vlan->vlan_id;
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ASSERT_RTNL();
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grp = rtnl_dereference(real_dev->vlgrp);
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BUG_ON(!grp);
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vlan_info = rtnl_dereference(real_dev->vlan_info);
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BUG_ON(!vlan_info);
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grp = &vlan_info->grp;
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/* Take it out of our own structures, but be sure to interlock with
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* HW accelerating devices or SW vlan input packet processing if
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@ -116,7 +93,7 @@ void unregister_vlan_dev(struct net_device *dev, struct list_head *head)
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if (vlan_id)
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vlan_vid_del(real_dev, vlan_id);
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grp->nr_vlans--;
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grp->nr_vlan_devs--;
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if (vlan->flags & VLAN_FLAG_GVRP)
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vlan_gvrp_request_leave(dev);
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@ -128,16 +105,9 @@ void unregister_vlan_dev(struct net_device *dev, struct list_head *head)
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*/
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unregister_netdevice_queue(dev, head);
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/* If the group is now empty, kill off the group. */
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if (grp->nr_vlans == 0) {
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if (grp->nr_vlan_devs == 0)
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vlan_gvrp_uninit_applicant(real_dev);
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RCU_INIT_POINTER(real_dev->vlgrp, NULL);
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/* Free the group, after all cpu's are done. */
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call_rcu(&grp->rcu, vlan_rcu_free);
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}
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/* Get rid of the vlan's reference to real_dev */
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dev_put(real_dev);
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}
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@ -169,17 +139,23 @@ int register_vlan_dev(struct net_device *dev)
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struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
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struct net_device *real_dev = vlan->real_dev;
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u16 vlan_id = vlan->vlan_id;
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struct vlan_group *grp, *ngrp = NULL;
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struct vlan_info *vlan_info;
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struct vlan_group *grp;
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int err;
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grp = rtnl_dereference(real_dev->vlgrp);
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if (!grp) {
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ngrp = grp = vlan_group_alloc(real_dev);
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if (!grp)
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return -ENOBUFS;
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err = vlan_vid_add(real_dev, vlan_id);
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if (err)
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return err;
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vlan_info = rtnl_dereference(real_dev->vlan_info);
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/* vlan_info should be there now. vlan_vid_add took care of it */
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BUG_ON(!vlan_info);
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grp = &vlan_info->grp;
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if (grp->nr_vlan_devs == 0) {
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err = vlan_gvrp_init_applicant(real_dev);
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if (err < 0)
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goto out_free_group;
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goto out_vid_del;
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}
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err = vlan_group_prealloc_vid(grp, vlan_id);
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@ -200,23 +176,15 @@ int register_vlan_dev(struct net_device *dev)
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* it into our local structure.
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*/
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vlan_group_set_device(grp, vlan_id, dev);
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grp->nr_vlans++;
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if (ngrp) {
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rcu_assign_pointer(real_dev->vlgrp, ngrp);
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}
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vlan_vid_add(real_dev, vlan_id);
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grp->nr_vlan_devs++;
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return 0;
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out_uninit_applicant:
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if (ngrp)
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if (grp->nr_vlan_devs == 0)
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vlan_gvrp_uninit_applicant(real_dev);
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out_free_group:
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if (ngrp) {
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/* Free the group, after all cpu's are done. */
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call_rcu(&ngrp->rcu, vlan_rcu_free);
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}
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out_vid_del:
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vlan_vid_del(real_dev, vlan_id);
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return err;
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}
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@ -357,6 +325,7 @@ static int vlan_device_event(struct notifier_block *unused, unsigned long event,
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{
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struct net_device *dev = ptr;
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struct vlan_group *grp;
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struct vlan_info *vlan_info;
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int i, flgs;
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struct net_device *vlandev;
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struct vlan_dev_priv *vlan;
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@ -372,9 +341,10 @@ static int vlan_device_event(struct notifier_block *unused, unsigned long event,
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vlan_vid_add(dev, 0);
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}
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grp = rtnl_dereference(dev->vlgrp);
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if (!grp)
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vlan_info = rtnl_dereference(dev->vlan_info);
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if (!vlan_info)
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goto out;
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grp = &vlan_info->grp;
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/* It is OK that we do not hold the group lock right now,
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* as we run under the RTNL lock.
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@ -478,9 +448,9 @@ static int vlan_device_event(struct notifier_block *unused, unsigned long event,
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if (!vlandev)
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continue;
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/* unregistration of last vlan destroys group, abort
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/* removal of last vid destroys vlan_info, abort
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* afterwards */
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if (grp->nr_vlans == 1)
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if (vlan_info->nr_vids == 1)
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i = VLAN_N_VID;
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unregister_vlan_dev(vlandev, &list);
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@ -3,6 +3,7 @@
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#include <linux/if_vlan.h>
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#include <linux/u64_stats_sync.h>
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#include <linux/list.h>
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/**
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@ -74,6 +75,29 @@ static inline struct vlan_dev_priv *vlan_dev_priv(const struct net_device *dev)
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return netdev_priv(dev);
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}
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/* if this changes, algorithm will have to be reworked because this
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* depends on completely exhausting the VLAN identifier space. Thus
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* it gives constant time look-up, but in many cases it wastes memory.
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*/
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#define VLAN_GROUP_ARRAY_SPLIT_PARTS 8
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#define VLAN_GROUP_ARRAY_PART_LEN (VLAN_N_VID/VLAN_GROUP_ARRAY_SPLIT_PARTS)
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struct vlan_group {
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unsigned int nr_vlan_devs;
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struct hlist_node hlist; /* linked list */
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struct net_device **vlan_devices_arrays[VLAN_GROUP_ARRAY_SPLIT_PARTS];
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};
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struct vlan_info {
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struct net_device *real_dev; /* The ethernet(like) device
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* the vlan is attached to.
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*/
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struct vlan_group grp;
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struct list_head vid_list;
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unsigned int nr_vids;
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struct rcu_head rcu;
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};
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static inline struct net_device *vlan_group_get_device(struct vlan_group *vg,
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u16 vlan_id)
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{
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@ -97,10 +121,10 @@ static inline void vlan_group_set_device(struct vlan_group *vg,
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static inline struct net_device *vlan_find_dev(struct net_device *real_dev,
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u16 vlan_id)
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{
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struct vlan_group *grp = rcu_dereference_rtnl(real_dev->vlgrp);
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struct vlan_info *vlan_info = rcu_dereference_rtnl(real_dev->vlan_info);
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if (grp)
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return vlan_group_get_device(grp, vlan_id);
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if (vlan_info)
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return vlan_group_get_device(&vlan_info->grp, vlan_id);
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return NULL;
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}
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@ -71,10 +71,10 @@ bool vlan_do_receive(struct sk_buff **skbp, bool last_handler)
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struct net_device *__vlan_find_dev_deep(struct net_device *real_dev,
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u16 vlan_id)
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{
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struct vlan_group *grp = rcu_dereference_rtnl(real_dev->vlgrp);
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struct vlan_info *vlan_info = rcu_dereference_rtnl(real_dev->vlan_info);
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if (grp) {
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return vlan_group_get_device(grp, vlan_id);
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if (vlan_info) {
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return vlan_group_get_device(&vlan_info->grp, vlan_id);
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} else {
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/*
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* Bonding slaves do not have grp assigned to themselves.
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@ -147,25 +147,177 @@ err_free:
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return NULL;
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}
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int vlan_vid_add(struct net_device *dev, unsigned short vid)
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/*
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* vlan info and vid list
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*/
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static void vlan_group_free(struct vlan_group *grp)
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{
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int i;
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for (i = 0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++)
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kfree(grp->vlan_devices_arrays[i]);
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}
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static void vlan_info_free(struct vlan_info *vlan_info)
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{
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vlan_group_free(&vlan_info->grp);
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kfree(vlan_info);
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}
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static void vlan_info_rcu_free(struct rcu_head *rcu)
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{
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vlan_info_free(container_of(rcu, struct vlan_info, rcu));
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}
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static struct vlan_info *vlan_info_alloc(struct net_device *dev)
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{
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struct vlan_info *vlan_info;
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vlan_info = kzalloc(sizeof(struct vlan_info), GFP_KERNEL);
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if (!vlan_info)
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return NULL;
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vlan_info->real_dev = dev;
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INIT_LIST_HEAD(&vlan_info->vid_list);
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return vlan_info;
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}
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struct vlan_vid_info {
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struct list_head list;
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unsigned short vid;
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int refcount;
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};
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static struct vlan_vid_info *vlan_vid_info_get(struct vlan_info *vlan_info,
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unsigned short vid)
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{
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struct vlan_vid_info *vid_info;
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list_for_each_entry(vid_info, &vlan_info->vid_list, list) {
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if (vid_info->vid == vid)
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return vid_info;
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}
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return NULL;
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}
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static struct vlan_vid_info *vlan_vid_info_alloc(unsigned short vid)
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{
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struct vlan_vid_info *vid_info;
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vid_info = kzalloc(sizeof(struct vlan_vid_info), GFP_KERNEL);
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if (!vid_info)
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return NULL;
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vid_info->vid = vid;
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return vid_info;
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}
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static int __vlan_vid_add(struct vlan_info *vlan_info, unsigned short vid,
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struct vlan_vid_info **pvid_info)
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{
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struct net_device *dev = vlan_info->real_dev;
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const struct net_device_ops *ops = dev->netdev_ops;
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struct vlan_vid_info *vid_info;
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int err;
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vid_info = vlan_vid_info_alloc(vid);
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if (!vid_info)
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return -ENOMEM;
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if ((dev->features & NETIF_F_HW_VLAN_FILTER) &&
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ops->ndo_vlan_rx_add_vid) {
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return ops->ndo_vlan_rx_add_vid(dev, vid);
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ops->ndo_vlan_rx_add_vid) {
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err = ops->ndo_vlan_rx_add_vid(dev, vid);
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if (err) {
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kfree(vid_info);
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return err;
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}
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}
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list_add(&vid_info->list, &vlan_info->vid_list);
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vlan_info->nr_vids++;
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*pvid_info = vid_info;
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return 0;
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}
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int vlan_vid_add(struct net_device *dev, unsigned short vid)
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{
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struct vlan_info *vlan_info;
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struct vlan_vid_info *vid_info;
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bool vlan_info_created = false;
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int err;
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ASSERT_RTNL();
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vlan_info = rtnl_dereference(dev->vlan_info);
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if (!vlan_info) {
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vlan_info = vlan_info_alloc(dev);
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if (!vlan_info)
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return -ENOMEM;
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vlan_info_created = true;
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}
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vid_info = vlan_vid_info_get(vlan_info, vid);
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if (!vid_info) {
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err = __vlan_vid_add(vlan_info, vid, &vid_info);
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if (err)
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goto out_free_vlan_info;
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}
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vid_info->refcount++;
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if (vlan_info_created)
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rcu_assign_pointer(dev->vlan_info, vlan_info);
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return 0;
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out_free_vlan_info:
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if (vlan_info_created)
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kfree(vlan_info);
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return err;
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}
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EXPORT_SYMBOL(vlan_vid_add);
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void vlan_vid_del(struct net_device *dev, unsigned short vid)
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static void __vlan_vid_del(struct vlan_info *vlan_info,
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struct vlan_vid_info *vid_info)
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{
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struct net_device *dev = vlan_info->real_dev;
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const struct net_device_ops *ops = dev->netdev_ops;
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unsigned short vid = vid_info->vid;
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int err;
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if ((dev->features & NETIF_F_HW_VLAN_FILTER) &&
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ops->ndo_vlan_rx_kill_vid) {
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ops->ndo_vlan_rx_kill_vid(dev, vid);
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err = ops->ndo_vlan_rx_kill_vid(dev, vid);
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if (err) {
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pr_warn("failed to kill vid %d for device %s\n",
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vid, dev->name);
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}
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}
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list_del(&vid_info->list);
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kfree(vid_info);
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vlan_info->nr_vids--;
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}
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void vlan_vid_del(struct net_device *dev, unsigned short vid)
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{
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struct vlan_info *vlan_info;
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struct vlan_vid_info *vid_info;
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||||
|
||||
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);
|
||||
|
||||
Loading…
Reference in New Issue
Block a user