Bluetooth: 6lowpan: Converting rwlocks to use RCU
The rwlocks are converted to use RCU. This helps performance as the irq locks are not needed any more. Signed-off-by: Jukka Rissanen <jukka.rissanen@linux.intel.com> Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Jukka Rissanen
Marcel Holtmann
parent
da213f8e0c
commit
9030582963
@ -53,7 +53,7 @@ struct skb_cb {
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* The list contains struct lowpan_dev elements.
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*/
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static LIST_HEAD(bt_6lowpan_devices);
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static DEFINE_RWLOCK(devices_lock);
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static DEFINE_SPINLOCK(devices_lock);
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/* If psm is set to 0 (default value), then 6lowpan is disabled.
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* Other values are used to indicate a Protocol Service Multiplexer
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@ -67,6 +67,7 @@ static struct l2cap_chan *listen_chan;
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struct lowpan_peer {
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struct list_head list;
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struct rcu_head rcu;
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struct l2cap_chan *chan;
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/* peer addresses in various formats */
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@ -86,6 +87,13 @@ struct lowpan_dev {
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struct delayed_work notify_peers;
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};
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static inline void peer_free(struct rcu_head *head)
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{
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struct lowpan_peer *e = container_of(head, struct lowpan_peer, rcu);
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kfree(e);
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}
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static inline struct lowpan_dev *lowpan_dev(const struct net_device *netdev)
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{
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return netdev_priv(netdev);
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@ -93,13 +101,14 @@ static inline struct lowpan_dev *lowpan_dev(const struct net_device *netdev)
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static inline void peer_add(struct lowpan_dev *dev, struct lowpan_peer *peer)
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{
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list_add(&peer->list, &dev->peers);
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list_add_rcu(&peer->list, &dev->peers);
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atomic_inc(&dev->peer_count);
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}
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static inline bool peer_del(struct lowpan_dev *dev, struct lowpan_peer *peer)
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{
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list_del(&peer->list);
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list_del_rcu(&peer->list);
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call_rcu(&peer->rcu, peer_free);
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module_put(THIS_MODULE);
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@ -114,31 +123,37 @@ static inline bool peer_del(struct lowpan_dev *dev, struct lowpan_peer *peer)
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static inline struct lowpan_peer *peer_lookup_ba(struct lowpan_dev *dev,
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bdaddr_t *ba, __u8 type)
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{
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struct lowpan_peer *peer, *tmp;
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struct lowpan_peer *peer;
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BT_DBG("peers %d addr %pMR type %d", atomic_read(&dev->peer_count),
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ba, type);
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list_for_each_entry_safe(peer, tmp, &dev->peers, list) {
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rcu_read_lock();
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list_for_each_entry_rcu(peer, &dev->peers, list) {
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BT_DBG("dst addr %pMR dst type %d",
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&peer->chan->dst, peer->chan->dst_type);
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if (bacmp(&peer->chan->dst, ba))
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continue;
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if (type == peer->chan->dst_type)
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if (type == peer->chan->dst_type) {
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rcu_read_unlock();
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return peer;
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}
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}
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rcu_read_unlock();
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return NULL;
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}
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static inline struct lowpan_peer *peer_lookup_chan(struct lowpan_dev *dev,
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struct l2cap_chan *chan)
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static inline struct lowpan_peer *__peer_lookup_chan(struct lowpan_dev *dev,
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struct l2cap_chan *chan)
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{
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struct lowpan_peer *peer, *tmp;
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struct lowpan_peer *peer;
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list_for_each_entry_safe(peer, tmp, &dev->peers, list) {
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list_for_each_entry_rcu(peer, &dev->peers, list) {
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if (peer->chan == chan)
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return peer;
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}
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@ -146,12 +161,12 @@ static inline struct lowpan_peer *peer_lookup_chan(struct lowpan_dev *dev,
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return NULL;
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}
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static inline struct lowpan_peer *peer_lookup_conn(struct lowpan_dev *dev,
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struct l2cap_conn *conn)
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static inline struct lowpan_peer *__peer_lookup_conn(struct lowpan_dev *dev,
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struct l2cap_conn *conn)
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{
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struct lowpan_peer *peer, *tmp;
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struct lowpan_peer *peer;
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list_for_each_entry_safe(peer, tmp, &dev->peers, list) {
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list_for_each_entry_rcu(peer, &dev->peers, list) {
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if (peer->chan->conn == conn)
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return peer;
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}
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@ -163,7 +178,7 @@ static inline struct lowpan_peer *peer_lookup_dst(struct lowpan_dev *dev,
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struct in6_addr *daddr,
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struct sk_buff *skb)
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{
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struct lowpan_peer *peer, *tmp;
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struct lowpan_peer *peer;
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struct in6_addr *nexthop;
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struct rt6_info *rt = (struct rt6_info *)skb_dst(skb);
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int count = atomic_read(&dev->peer_count);
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@ -174,9 +189,13 @@ static inline struct lowpan_peer *peer_lookup_dst(struct lowpan_dev *dev,
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* send the packet. If only one peer exists, then we can send the
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* packet right away.
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*/
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if (count == 1)
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return list_first_entry(&dev->peers, struct lowpan_peer,
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list);
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if (count == 1) {
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rcu_read_lock();
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peer = list_first_or_null_rcu(&dev->peers, struct lowpan_peer,
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list);
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rcu_read_unlock();
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return peer;
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}
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if (!rt) {
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nexthop = &lowpan_cb(skb)->gw;
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@ -195,53 +214,57 @@ static inline struct lowpan_peer *peer_lookup_dst(struct lowpan_dev *dev,
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BT_DBG("gw %pI6c", nexthop);
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list_for_each_entry_safe(peer, tmp, &dev->peers, list) {
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rcu_read_lock();
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list_for_each_entry_rcu(peer, &dev->peers, list) {
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BT_DBG("dst addr %pMR dst type %d ip %pI6c",
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&peer->chan->dst, peer->chan->dst_type,
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&peer->peer_addr);
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if (!ipv6_addr_cmp(&peer->peer_addr, nexthop))
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if (!ipv6_addr_cmp(&peer->peer_addr, nexthop)) {
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rcu_read_unlock();
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return peer;
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}
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}
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rcu_read_unlock();
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return NULL;
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}
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static struct lowpan_peer *lookup_peer(struct l2cap_conn *conn)
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{
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struct lowpan_dev *entry, *tmp;
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struct lowpan_dev *entry;
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struct lowpan_peer *peer = NULL;
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unsigned long flags;
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read_lock_irqsave(&devices_lock, flags);
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rcu_read_lock();
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list_for_each_entry_safe(entry, tmp, &bt_6lowpan_devices, list) {
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peer = peer_lookup_conn(entry, conn);
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list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) {
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peer = __peer_lookup_conn(entry, conn);
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if (peer)
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break;
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}
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read_unlock_irqrestore(&devices_lock, flags);
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rcu_read_unlock();
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return peer;
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}
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static struct lowpan_dev *lookup_dev(struct l2cap_conn *conn)
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{
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struct lowpan_dev *entry, *tmp;
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struct lowpan_dev *entry;
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struct lowpan_dev *dev = NULL;
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unsigned long flags;
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read_lock_irqsave(&devices_lock, flags);
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rcu_read_lock();
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list_for_each_entry_safe(entry, tmp, &bt_6lowpan_devices, list) {
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list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) {
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if (conn->hcon->hdev == entry->hdev) {
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dev = entry;
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break;
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}
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}
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read_unlock_irqrestore(&devices_lock, flags);
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rcu_read_unlock();
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return dev;
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}
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@ -264,13 +287,12 @@ static int iphc_decompress(struct sk_buff *skb, struct net_device *netdev,
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u8 iphc0, iphc1;
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struct lowpan_dev *dev;
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struct lowpan_peer *peer;
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unsigned long flags;
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dev = lowpan_dev(netdev);
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read_lock_irqsave(&devices_lock, flags);
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peer = peer_lookup_chan(dev, chan);
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read_unlock_irqrestore(&devices_lock, flags);
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rcu_read_lock();
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peer = __peer_lookup_chan(dev, chan);
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rcu_read_unlock();
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if (!peer)
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goto drop;
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@ -452,7 +474,6 @@ static int setup_header(struct sk_buff *skb, struct net_device *netdev,
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if (ipv6_addr_is_multicast(&ipv6_daddr)) {
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lowpan_cb(skb)->chan = NULL;
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} else {
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unsigned long flags;
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u8 addr_type;
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/* Get destination BT device from skb.
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@ -463,19 +484,14 @@ static int setup_header(struct sk_buff *skb, struct net_device *netdev,
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BT_DBG("dest addr %pMR type %d IP %pI6c", &addr,
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addr_type, &ipv6_daddr);
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read_lock_irqsave(&devices_lock, flags);
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peer = peer_lookup_ba(dev, &addr, addr_type);
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read_unlock_irqrestore(&devices_lock, flags);
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if (!peer) {
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/* The packet might be sent to 6lowpan interface
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* because of routing (either via default route
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* or user set route) so get peer according to
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* the destination address.
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*/
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read_lock_irqsave(&devices_lock, flags);
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peer = peer_lookup_dst(dev, &ipv6_daddr, skb);
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read_unlock_irqrestore(&devices_lock, flags);
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if (!peer) {
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BT_DBG("no such peer %pMR found", &addr);
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return -ENOENT;
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@ -558,14 +574,13 @@ static int send_pkt(struct l2cap_chan *chan, struct sk_buff *skb,
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static int send_mcast_pkt(struct sk_buff *skb, struct net_device *netdev)
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{
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struct sk_buff *local_skb;
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struct lowpan_dev *entry, *tmp;
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unsigned long flags;
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struct lowpan_dev *entry;
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int err = 0;
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read_lock_irqsave(&devices_lock, flags);
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rcu_read_lock();
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list_for_each_entry_safe(entry, tmp, &bt_6lowpan_devices, list) {
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struct lowpan_peer *pentry, *ptmp;
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list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) {
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struct lowpan_peer *pentry;
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struct lowpan_dev *dev;
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if (entry->netdev != netdev)
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@ -573,7 +588,7 @@ static int send_mcast_pkt(struct sk_buff *skb, struct net_device *netdev)
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dev = lowpan_dev(entry->netdev);
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list_for_each_entry_safe(pentry, ptmp, &dev->peers, list) {
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list_for_each_entry_rcu(pentry, &dev->peers, list) {
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int ret;
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local_skb = skb_clone(skb, GFP_ATOMIC);
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@ -590,7 +605,7 @@ static int send_mcast_pkt(struct sk_buff *skb, struct net_device *netdev)
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}
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}
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read_unlock_irqrestore(&devices_lock, flags);
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rcu_read_unlock();
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return err;
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}
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@ -792,7 +807,6 @@ static struct l2cap_chan *add_peer_chan(struct l2cap_chan *chan,
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struct lowpan_dev *dev)
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{
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struct lowpan_peer *peer;
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unsigned long flags;
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peer = kzalloc(sizeof(*peer), GFP_ATOMIC);
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if (!peer)
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@ -815,10 +829,10 @@ static struct l2cap_chan *add_peer_chan(struct l2cap_chan *chan,
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*/
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set_ip_addr_bits(chan->dst_type, (u8 *)&peer->peer_addr.s6_addr + 8);
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write_lock_irqsave(&devices_lock, flags);
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spin_lock(&devices_lock);
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INIT_LIST_HEAD(&peer->list);
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peer_add(dev, peer);
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write_unlock_irqrestore(&devices_lock, flags);
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spin_unlock(&devices_lock);
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/* Notifying peers about us needs to be done without locks held */
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INIT_DELAYED_WORK(&dev->notify_peers, do_notify_peers);
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@ -831,7 +845,6 @@ static int setup_netdev(struct l2cap_chan *chan, struct lowpan_dev **dev)
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{
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struct net_device *netdev;
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int err = 0;
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unsigned long flags;
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netdev = alloc_netdev(sizeof(struct lowpan_dev), IFACE_NAME_TEMPLATE,
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NET_NAME_UNKNOWN, netdev_setup);
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@ -861,10 +874,10 @@ static int setup_netdev(struct l2cap_chan *chan, struct lowpan_dev **dev)
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(*dev)->hdev = chan->conn->hcon->hdev;
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INIT_LIST_HEAD(&(*dev)->peers);
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write_lock_irqsave(&devices_lock, flags);
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spin_lock(&devices_lock);
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INIT_LIST_HEAD(&(*dev)->list);
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list_add(&(*dev)->list, &bt_6lowpan_devices);
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write_unlock_irqrestore(&devices_lock, flags);
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list_add_rcu(&(*dev)->list, &bt_6lowpan_devices);
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spin_unlock(&devices_lock);
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return 0;
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@ -918,11 +931,10 @@ static void delete_netdev(struct work_struct *work)
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static void chan_close_cb(struct l2cap_chan *chan)
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{
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struct lowpan_dev *entry, *tmp;
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struct lowpan_dev *entry;
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struct lowpan_dev *dev = NULL;
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struct lowpan_peer *peer;
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int err = -ENOENT;
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unsigned long flags;
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bool last = false, removed = true;
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BT_DBG("chan %p conn %p", chan, chan->conn);
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@ -937,11 +949,11 @@ static void chan_close_cb(struct l2cap_chan *chan)
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removed = false;
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}
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write_lock_irqsave(&devices_lock, flags);
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spin_lock(&devices_lock);
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list_for_each_entry_safe(entry, tmp, &bt_6lowpan_devices, list) {
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list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) {
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dev = lowpan_dev(entry->netdev);
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peer = peer_lookup_chan(dev, chan);
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peer = __peer_lookup_chan(dev, chan);
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if (peer) {
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last = peer_del(dev, peer);
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err = 0;
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@ -952,13 +964,12 @@ static void chan_close_cb(struct l2cap_chan *chan)
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atomic_read(&chan->kref.refcount));
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l2cap_chan_put(chan);
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kfree(peer);
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break;
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}
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}
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if (!err && last && dev && !atomic_read(&dev->peer_count)) {
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write_unlock_irqrestore(&devices_lock, flags);
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spin_unlock(&devices_lock);
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cancel_delayed_work_sync(&dev->notify_peers);
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@ -969,7 +980,7 @@ static void chan_close_cb(struct l2cap_chan *chan)
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schedule_work(&entry->delete_netdev);
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}
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} else {
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write_unlock_irqrestore(&devices_lock, flags);
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spin_unlock(&devices_lock);
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}
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return;
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@ -1161,10 +1172,9 @@ static int get_l2cap_conn(char *buf, bdaddr_t *addr, u8 *addr_type,
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static void disconnect_all_peers(void)
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{
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struct lowpan_dev *entry, *tmp_dev;
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struct lowpan_dev *entry;
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struct lowpan_peer *peer, *tmp_peer, *new_peer;
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struct list_head peers;
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unsigned long flags;
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INIT_LIST_HEAD(&peers);
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@ -1173,10 +1183,10 @@ static void disconnect_all_peers(void)
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* with the same list at the same time.
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*/
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read_lock_irqsave(&devices_lock, flags);
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rcu_read_lock();
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list_for_each_entry_safe(entry, tmp_dev, &bt_6lowpan_devices, list) {
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list_for_each_entry_safe(peer, tmp_peer, &entry->peers, list) {
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list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) {
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list_for_each_entry_rcu(peer, &entry->peers, list) {
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new_peer = kmalloc(sizeof(*new_peer), GFP_ATOMIC);
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if (!new_peer)
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break;
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@ -1188,26 +1198,36 @@ static void disconnect_all_peers(void)
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}
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}
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read_unlock_irqrestore(&devices_lock, flags);
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rcu_read_unlock();
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spin_lock(&devices_lock);
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list_for_each_entry_safe(peer, tmp_peer, &peers, list) {
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l2cap_chan_close(peer->chan, ENOENT);
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kfree(peer);
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list_del_rcu(&peer->list);
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call_rcu(&peer->rcu, peer_free);
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module_put(THIS_MODULE);
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}
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spin_unlock(&devices_lock);
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}
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static int lowpan_psm_set(void *data, u64 val)
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{
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struct set_psm {
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struct work_struct work;
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u16 psm;
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};
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psm = val;
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if (psm == 0 || psm_6lowpan != psm)
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static void do_psm_set(struct work_struct *work)
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{
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struct set_psm *set_psm = container_of(work, struct set_psm, work);
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if (set_psm->psm == 0 || psm_6lowpan != set_psm->psm)
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/* Disconnect existing connections if 6lowpan is
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* disabled (psm = 0), or if psm changes.
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*/
|
||||
disconnect_all_peers();
|
||||
|
||||
psm_6lowpan = psm;
|
||||
psm_6lowpan = set_psm->psm;
|
||||
|
||||
if (listen_chan) {
|
||||
l2cap_chan_close(listen_chan, 0);
|
||||
@ -1216,6 +1236,22 @@ static int lowpan_psm_set(void *data, u64 val)
|
||||
|
||||
listen_chan = bt_6lowpan_listen();
|
||||
|
||||
kfree(set_psm);
|
||||
}
|
||||
|
||||
static int lowpan_psm_set(void *data, u64 val)
|
||||
{
|
||||
struct set_psm *set_psm;
|
||||
|
||||
set_psm = kzalloc(sizeof(*set_psm), GFP_KERNEL);
|
||||
if (!set_psm)
|
||||
return -ENOMEM;
|
||||
|
||||
set_psm->psm = val;
|
||||
INIT_WORK(&set_psm->work, do_psm_set);
|
||||
|
||||
schedule_work(&set_psm->work);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
@ -1297,19 +1333,18 @@ static ssize_t lowpan_control_write(struct file *fp,
|
||||
|
||||
static int lowpan_control_show(struct seq_file *f, void *ptr)
|
||||
{
|
||||
struct lowpan_dev *entry, *tmp_dev;
|
||||
struct lowpan_peer *peer, *tmp_peer;
|
||||
unsigned long flags;
|
||||
struct lowpan_dev *entry;
|
||||
struct lowpan_peer *peer;
|
||||
|
||||
read_lock_irqsave(&devices_lock, flags);
|
||||
spin_lock(&devices_lock);
|
||||
|
||||
list_for_each_entry_safe(entry, tmp_dev, &bt_6lowpan_devices, list) {
|
||||
list_for_each_entry_safe(peer, tmp_peer, &entry->peers, list)
|
||||
list_for_each_entry(entry, &bt_6lowpan_devices, list) {
|
||||
list_for_each_entry(peer, &entry->peers, list)
|
||||
seq_printf(f, "%pMR (type %u)\n",
|
||||
&peer->chan->dst, peer->chan->dst_type);
|
||||
}
|
||||
|
||||
read_unlock_irqrestore(&devices_lock, flags);
|
||||
spin_unlock(&devices_lock);
|
||||
|
||||
return 0;
|
||||
}
|
||||
@ -1329,9 +1364,8 @@ static const struct file_operations lowpan_control_fops = {
|
||||
|
||||
static void disconnect_devices(void)
|
||||
{
|
||||
struct lowpan_dev *entry, *tmp, *new_dev;
|
||||
struct lowpan_dev *entry, *new_dev;
|
||||
struct list_head devices;
|
||||
unsigned long flags;
|
||||
|
||||
INIT_LIST_HEAD(&devices);
|
||||
|
||||
@ -1340,9 +1374,9 @@ static void disconnect_devices(void)
|
||||
* devices list.
|
||||
*/
|
||||
|
||||
read_lock_irqsave(&devices_lock, flags);
|
||||
rcu_read_lock();
|
||||
|
||||
list_for_each_entry_safe(entry, tmp, &bt_6lowpan_devices, list) {
|
||||
list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) {
|
||||
new_dev = kmalloc(sizeof(*new_dev), GFP_ATOMIC);
|
||||
if (!new_dev)
|
||||
break;
|
||||
@ -1350,12 +1384,12 @@ static void disconnect_devices(void)
|
||||
new_dev->netdev = entry->netdev;
|
||||
INIT_LIST_HEAD(&new_dev->list);
|
||||
|
||||
list_add(&new_dev->list, &devices);
|
||||
list_add_rcu(&new_dev->list, &devices);
|
||||
}
|
||||
|
||||
read_unlock_irqrestore(&devices_lock, flags);
|
||||
rcu_read_unlock();
|
||||
|
||||
list_for_each_entry_safe(entry, tmp, &devices, list) {
|
||||
list_for_each_entry(entry, &devices, list) {
|
||||
ifdown(entry->netdev);
|
||||
BT_DBG("Unregistering netdev %s %p",
|
||||
entry->netdev->name, entry->netdev);
|
||||
@ -1368,17 +1402,15 @@ static int device_event(struct notifier_block *unused,
|
||||
unsigned long event, void *ptr)
|
||||
{
|
||||
struct net_device *netdev = netdev_notifier_info_to_dev(ptr);
|
||||
struct lowpan_dev *entry, *tmp;
|
||||
unsigned long flags;
|
||||
struct lowpan_dev *entry;
|
||||
|
||||
if (netdev->type != ARPHRD_6LOWPAN)
|
||||
return NOTIFY_DONE;
|
||||
|
||||
switch (event) {
|
||||
case NETDEV_UNREGISTER:
|
||||
write_lock_irqsave(&devices_lock, flags);
|
||||
list_for_each_entry_safe(entry, tmp, &bt_6lowpan_devices,
|
||||
list) {
|
||||
spin_lock(&devices_lock);
|
||||
list_for_each_entry(entry, &bt_6lowpan_devices, list) {
|
||||
if (entry->netdev == netdev) {
|
||||
BT_DBG("Unregistered netdev %s %p",
|
||||
netdev->name, netdev);
|
||||
@ -1387,7 +1419,7 @@ static int device_event(struct notifier_block *unused,
|
||||
break;
|
||||
}
|
||||
}
|
||||
write_unlock_irqrestore(&devices_lock, flags);
|
||||
spin_unlock(&devices_lock);
|
||||
break;
|
||||
}
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user