net: introduce a list of device addresses dev_addr_list (v6)
v5 -> v6 (current): -removed so far unused static functions -corrected dev_addr_del_multiple to call del instead of add v4 -> v5: -added device address type (suggested by davem) -removed refcounting (better to have simplier code then safe potentially few bytes) v3 -> v4: -changed kzalloc to kmalloc in __hw_addr_add_ii() -ASSERT_RTNL() avoided in dev_addr_flush() and dev_addr_init() v2 -> v3: -removed unnecessary rcu read locking -moved dev_addr_flush() calling to ensure no null dereference of dev_addr v1 -> v2: -added forgotten ASSERT_RTNL to dev_addr_init and dev_addr_flush -removed unnecessary rcu_read locking in dev_addr_init -use compare_ether_addr_64bits instead of compare_ether_addr -use L1_CACHE_BYTES as size for allocating struct netdev_hw_addr -use call_rcu instead of rcu_synchronize -moved is_etherdev_addr into __KERNEL__ ifdef This patch introduces a new list in struct net_device and brings a set of functions to handle the work with device address list. The list is a replacement for the original dev_addr field and because in some situations there is need to carry several device addresses with the net device. To be backward compatible, dev_addr is made to point to the first member of the list so original drivers sees no difference. 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
b6907b0c70
commit
f001fde5ea
3 changed files with 312 additions and 2 deletions
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@ -182,6 +182,33 @@ static inline unsigned compare_ether_addr_64bits(const u8 addr1[6+2],
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return compare_ether_addr(addr1, addr2);
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#endif
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}
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/**
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* is_etherdev_addr - Tell if given Ethernet address belongs to the device.
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* @dev: Pointer to a device structure
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* @addr: Pointer to a six-byte array containing the Ethernet address
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*
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* Compare passed address with all addresses of the device. Return true if the
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* address if one of the device addresses.
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*
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* Note that this function calls compare_ether_addr_64bits() so take care of
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* the right padding.
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*/
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static inline bool is_etherdev_addr(const struct net_device *dev,
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const u8 addr[6 + 2])
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{
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struct netdev_hw_addr *ha;
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int res = 1;
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rcu_read_lock();
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for_each_dev_addr(dev, ha) {
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res = compare_ether_addr_64bits(addr, ha->addr);
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if (!res)
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break;
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}
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rcu_read_unlock();
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return !res;
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}
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#endif /* __KERNEL__ */
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/**
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@ -210,6 +210,16 @@ struct dev_addr_list
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#define dmi_users da_users
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#define dmi_gusers da_gusers
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struct netdev_hw_addr {
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struct list_head list;
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unsigned char addr[MAX_ADDR_LEN];
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unsigned char type;
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#define NETDEV_HW_ADDR_T_LAN 1
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#define NETDEV_HW_ADDR_T_SAN 2
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#define NETDEV_HW_ADDR_T_SLAVE 3
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struct rcu_head rcu_head;
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};
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struct hh_cache
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{
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struct hh_cache *hh_next; /* Next entry */
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@ -784,8 +794,11 @@ struct net_device
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*/
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unsigned long last_rx; /* Time of last Rx */
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/* Interface address info used in eth_type_trans() */
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unsigned char dev_addr[MAX_ADDR_LEN]; /* hw address, (before bcast
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because most packets are unicast) */
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unsigned char *dev_addr; /* hw address, (before bcast
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because most packets are
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unicast) */
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struct list_head dev_addr_list; /* list of device hw addresses */
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unsigned char broadcast[MAX_ADDR_LEN]; /* hw bcast add */
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@ -1791,6 +1804,13 @@ static inline void netif_addr_unlock_bh(struct net_device *dev)
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spin_unlock_bh(&dev->addr_list_lock);
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}
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/*
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* dev_addr_list walker. Should be used only for read access. Call with
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* rcu_read_lock held.
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*/
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#define for_each_dev_addr(dev, ha) \
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list_for_each_entry_rcu(ha, &dev->dev_addr_list, list)
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/* These functions live elsewhere (drivers/net/net_init.c, but related) */
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extern void ether_setup(struct net_device *dev);
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@ -1803,6 +1823,19 @@ extern struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name,
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alloc_netdev_mq(sizeof_priv, name, setup, 1)
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extern int register_netdev(struct net_device *dev);
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extern void unregister_netdev(struct net_device *dev);
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/* Functions used for device addresses handling */
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extern int dev_addr_add(struct net_device *dev, unsigned char *addr,
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unsigned char addr_type);
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extern int dev_addr_del(struct net_device *dev, unsigned char *addr,
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unsigned char addr_type);
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extern int dev_addr_add_multiple(struct net_device *to_dev,
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struct net_device *from_dev,
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unsigned char addr_type);
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extern int dev_addr_del_multiple(struct net_device *to_dev,
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struct net_device *from_dev,
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unsigned char addr_type);
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/* Functions used for secondary unicast and multicast support */
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extern void dev_set_rx_mode(struct net_device *dev);
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extern void __dev_set_rx_mode(struct net_device *dev);
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250
net/core/dev.c
250
net/core/dev.c
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@ -3434,6 +3434,252 @@ void dev_set_rx_mode(struct net_device *dev)
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netif_addr_unlock_bh(dev);
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}
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/* hw addresses list handling functions */
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static int __hw_addr_add(struct list_head *list, unsigned char *addr,
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int addr_len, unsigned char addr_type)
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{
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struct netdev_hw_addr *ha;
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int alloc_size;
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if (addr_len > MAX_ADDR_LEN)
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return -EINVAL;
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alloc_size = sizeof(*ha);
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if (alloc_size < L1_CACHE_BYTES)
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alloc_size = L1_CACHE_BYTES;
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ha = kmalloc(alloc_size, GFP_ATOMIC);
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if (!ha)
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return -ENOMEM;
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memcpy(ha->addr, addr, addr_len);
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ha->type = addr_type;
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list_add_tail_rcu(&ha->list, list);
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return 0;
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}
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static void ha_rcu_free(struct rcu_head *head)
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{
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struct netdev_hw_addr *ha;
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ha = container_of(head, struct netdev_hw_addr, rcu_head);
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kfree(ha);
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}
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static int __hw_addr_del_ii(struct list_head *list, unsigned char *addr,
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int addr_len, unsigned char addr_type,
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int ignore_index)
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{
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struct netdev_hw_addr *ha;
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int i = 0;
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list_for_each_entry(ha, list, list) {
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if (i++ != ignore_index &&
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!memcmp(ha->addr, addr, addr_len) &&
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(ha->type == addr_type || !addr_type)) {
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list_del_rcu(&ha->list);
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call_rcu(&ha->rcu_head, ha_rcu_free);
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return 0;
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}
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}
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return -ENOENT;
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}
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static int __hw_addr_add_multiple_ii(struct list_head *to_list,
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struct list_head *from_list,
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int addr_len, unsigned char addr_type,
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int ignore_index)
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{
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int err;
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struct netdev_hw_addr *ha, *ha2;
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unsigned char type;
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list_for_each_entry(ha, from_list, list) {
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type = addr_type ? addr_type : ha->type;
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err = __hw_addr_add(to_list, ha->addr, addr_len, type);
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if (err)
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goto unroll;
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}
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return 0;
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unroll:
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list_for_each_entry(ha2, from_list, list) {
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if (ha2 == ha)
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break;
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type = addr_type ? addr_type : ha2->type;
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__hw_addr_del_ii(to_list, ha2->addr, addr_len, type,
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ignore_index);
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}
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return err;
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}
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static void __hw_addr_del_multiple_ii(struct list_head *to_list,
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struct list_head *from_list,
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int addr_len, unsigned char addr_type,
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int ignore_index)
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{
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struct netdev_hw_addr *ha;
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unsigned char type;
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list_for_each_entry(ha, from_list, list) {
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type = addr_type ? addr_type : ha->type;
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__hw_addr_del_ii(to_list, ha->addr, addr_len, addr_type,
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ignore_index);
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}
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}
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static void __hw_addr_flush(struct list_head *list)
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{
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struct netdev_hw_addr *ha, *tmp;
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list_for_each_entry_safe(ha, tmp, list, list) {
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list_del_rcu(&ha->list);
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call_rcu(&ha->rcu_head, ha_rcu_free);
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}
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}
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/* Device addresses handling functions */
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static void dev_addr_flush(struct net_device *dev)
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{
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/* rtnl_mutex must be held here */
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__hw_addr_flush(&dev->dev_addr_list);
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dev->dev_addr = NULL;
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}
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static int dev_addr_init(struct net_device *dev)
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{
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unsigned char addr[MAX_ADDR_LEN];
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struct netdev_hw_addr *ha;
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int err;
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/* rtnl_mutex must be held here */
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INIT_LIST_HEAD(&dev->dev_addr_list);
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memset(addr, 0, sizeof(*addr));
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err = __hw_addr_add(&dev->dev_addr_list, addr, sizeof(*addr),
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NETDEV_HW_ADDR_T_LAN);
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if (!err) {
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/*
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* Get the first (previously created) address from the list
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* and set dev_addr pointer to this location.
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*/
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ha = list_first_entry(&dev->dev_addr_list,
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struct netdev_hw_addr, list);
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dev->dev_addr = ha->addr;
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}
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return err;
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}
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/**
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* dev_addr_add - Add a device address
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* @dev: device
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* @addr: address to add
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* @addr_type: address type
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*
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* Add a device address to the device or increase the reference count if
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* it already exists.
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*
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* The caller must hold the rtnl_mutex.
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*/
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int dev_addr_add(struct net_device *dev, unsigned char *addr,
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unsigned char addr_type)
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{
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int err;
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ASSERT_RTNL();
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err = __hw_addr_add(&dev->dev_addr_list, addr, dev->addr_len,
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addr_type);
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if (!err)
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call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
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return err;
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}
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EXPORT_SYMBOL(dev_addr_add);
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/**
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* dev_addr_del - Release a device address.
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* @dev: device
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* @addr: address to delete
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* @addr_type: address type
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*
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* Release reference to a device address and remove it from the device
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* if the reference count drops to zero.
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*
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* The caller must hold the rtnl_mutex.
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*/
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int dev_addr_del(struct net_device *dev, unsigned char *addr,
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unsigned char addr_type)
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{
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int err;
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ASSERT_RTNL();
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err = __hw_addr_del_ii(&dev->dev_addr_list, addr, dev->addr_len,
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addr_type, 0);
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if (!err)
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call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
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return err;
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}
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EXPORT_SYMBOL(dev_addr_del);
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/**
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* dev_addr_add_multiple - Add device addresses from another device
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* @to_dev: device to which addresses will be added
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* @from_dev: device from which addresses will be added
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* @addr_type: address type - 0 means type will be used from from_dev
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*
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* Add device addresses of the one device to another.
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**
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* The caller must hold the rtnl_mutex.
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*/
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int dev_addr_add_multiple(struct net_device *to_dev,
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struct net_device *from_dev,
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unsigned char addr_type)
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{
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int err;
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ASSERT_RTNL();
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if (from_dev->addr_len != to_dev->addr_len)
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return -EINVAL;
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err = __hw_addr_add_multiple_ii(&to_dev->dev_addr_list,
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&from_dev->dev_addr_list,
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to_dev->addr_len, addr_type, 0);
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if (!err)
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call_netdevice_notifiers(NETDEV_CHANGEADDR, to_dev);
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return err;
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}
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EXPORT_SYMBOL(dev_addr_add_multiple);
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/**
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* dev_addr_del_multiple - Delete device addresses by another device
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* @to_dev: device where the addresses will be deleted
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* @from_dev: device by which addresses the addresses will be deleted
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* @addr_type: address type - 0 means type will used from from_dev
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*
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* Deletes addresses in to device by the list of addresses in from device.
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*
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* The caller must hold the rtnl_mutex.
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*/
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int dev_addr_del_multiple(struct net_device *to_dev,
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struct net_device *from_dev,
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unsigned char addr_type)
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{
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ASSERT_RTNL();
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if (from_dev->addr_len != to_dev->addr_len)
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return -EINVAL;
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__hw_addr_del_multiple_ii(&to_dev->dev_addr_list,
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&from_dev->dev_addr_list,
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to_dev->addr_len, addr_type, 0);
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call_netdevice_notifiers(NETDEV_CHANGEADDR, to_dev);
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return 0;
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}
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EXPORT_SYMBOL(dev_addr_del_multiple);
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/* unicast and multicast addresses handling functions */
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int __dev_addr_delete(struct dev_addr_list **list, int *count,
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void *addr, int alen, int glbl)
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{
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@ -4776,6 +5022,7 @@ struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name,
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dev->gso_max_size = GSO_MAX_SIZE;
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dev_addr_init(dev);
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netdev_init_queues(dev);
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INIT_LIST_HEAD(&dev->napi_list);
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@ -4801,6 +5048,9 @@ void free_netdev(struct net_device *dev)
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kfree(dev->_tx);
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/* Flush device addresses */
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dev_addr_flush(dev);
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list_for_each_entry_safe(p, n, &dev->napi_list, dev_list)
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netif_napi_del(p);
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