1 files changed, 38 insertions, 14 deletions

diff --git a/include/linux/netpoll.h b/include/linux/netpoll.h
index 2524267210d3..50d8009be86c 100644
--- a/include/linux/netpoll.h
+++ b/include/linux/netpoll.h
@@ -14,6 +14,7 @@
 
 struct netpoll {
         struct net_device *dev;
+        struct net_device *real_dev;
         char dev_name[IFNAMSIZ];
         const char *name;
         void (*rx_hook)(struct netpoll *, int, char *, int);
@@ -21,53 +22,69 @@ struct netpoll {
         __be32 local_ip, remote_ip;
         u16 local_port, remote_port;
         u8 remote_mac[ETH_ALEN];
+
+        struct list_head rx; /* rx_np list element */
 };
 
 struct netpoll_info {
         atomic_t refcnt;
+
         int rx_flags;
         spinlock_t rx_lock;
-        struct netpoll *rx_np; /* netpoll that registered an rx_hook */
+        struct list_head rx_np; /* netpolls that registered an rx_hook */
+
         struct sk_buff_head arp_tx; /* list of arp requests to reply to */
         struct sk_buff_head txq;
+
         struct delayed_work tx_work;
+
+        struct netpoll *netpoll;
 };
 
+void netpoll_poll_dev(struct net_device *dev);
 void netpoll_poll(struct netpoll *np);
 void netpoll_send_udp(struct netpoll *np, const char *msg, int len);
 void netpoll_print_options(struct netpoll *np);
 int netpoll_parse_options(struct netpoll *np, char *opt);
+int __netpoll_setup(struct netpoll *np);
 int netpoll_setup(struct netpoll *np);
 int netpoll_trap(void);
 void netpoll_set_trap(int trap);
+void __netpoll_cleanup(struct netpoll *np);
 void netpoll_cleanup(struct netpoll *np);
 int __netpoll_rx(struct sk_buff *skb);
+void netpoll_send_skb(struct netpoll *np, struct sk_buff *skb);
 
 
 #ifdef CONFIG_NETPOLL
-static inline int netpoll_rx(struct sk_buff *skb)
+static inline bool netpoll_rx(struct sk_buff *skb)
 {
-        struct netpoll_info *npinfo = skb->dev->npinfo;
+        struct netpoll_info *npinfo;
         unsigned long flags;
-        int ret = 0;
+        bool ret = false;
+
+        local_irq_save(flags);
+        npinfo = rcu_dereference_bh(skb->dev->npinfo);
 
-        if (!npinfo || (!npinfo->rx_np && !npinfo->rx_flags))
-                return 0;
+        if (!npinfo || (list_empty(&npinfo->rx_np) && !npinfo->rx_flags))
+                goto out;
 
-        spin_lock_irqsave(&npinfo->rx_lock, flags);
+        spin_lock(&npinfo->rx_lock);
         /* check rx_flags again with the lock held */
         if (npinfo->rx_flags && __netpoll_rx(skb))
-                ret = 1;
-        spin_unlock_irqrestore(&npinfo->rx_lock, flags);
+                ret = true;
+        spin_unlock(&npinfo->rx_lock);
 
+out:
+        local_irq_restore(flags);
         return ret;
 }
 
 static inline int netpoll_rx_on(struct sk_buff *skb)
 {
-        struct netpoll_info *npinfo = skb->dev->npinfo;
+        struct netpoll_info *npinfo = rcu_dereference_bh(skb->dev->npinfo);
 
-        return npinfo && (npinfo->rx_np || npinfo->rx_flags);
+        return npinfo && (!list_empty(&npinfo->rx_np) || npinfo->rx_flags);
 }
 
 static inline int netpoll_receive_skb(struct sk_buff *skb)
@@ -81,7 +98,6 @@ static inline void *netpoll_poll_lock(struct napi_struct *napi)
 {
         struct net_device *dev = napi->dev;
 
-        rcu_read_lock(); /* deal with race on ->npinfo */
         if (dev && dev->npinfo) {
                 spin_lock(&napi->poll_lock);
                 napi->poll_owner = smp_processor_id();
@@ -98,11 +114,15 @@ static inline void netpoll_poll_unlock(void *have)
                 napi->poll_owner = -1;
                 spin_unlock(&napi->poll_lock);
         }
-        rcu_read_unlock();
+}
+
+static inline int netpoll_tx_running(struct net_device *dev)
+{
+        return irqs_disabled();
 }
 
 #else
-static inline int netpoll_rx(struct sk_buff *skb)
+static inline bool netpoll_rx(struct sk_buff *skb)
 {
         return 0;
 }
@@ -124,6 +144,10 @@ static inline void netpoll_poll_unlock(void *have)
 static inline void netpoll_netdev_init(struct net_device *dev)
 {
 }
+static inline int netpoll_tx_running(struct net_device *dev)
+{
+        return 0;
+}
 #endif
 
 #endif