first commit

1 files changed, 180 insertions, 0 deletions

diff --git a/include/linux/netpoll.h b/include/linux/netpoll.h
new file mode 100644
index 000000000..fa2cb76a7
--- /dev/null
+++ b/include/linux/netpoll.h
@@ -0,0 +1,180 @@
+/*
+ * Common code for low-level network console, dump, and debugger code
+ *
+ * Derived from netconsole, kgdb-over-ethernet, and netdump patches
+ */
+
+#ifndef _LINUX_NETPOLL_H
+#define _LINUX_NETPOLL_H
+
+#include <linux/netdevice.h>
+#include <linux/interrupt.h>
+#include <linux/rcupdate.h>
+#include <linux/list.h>
+
+union inet_addr {
+	__u32		all[4];
+	__be32		ip;
+	__be32		ip6[4];
+	struct in_addr	in;
+	struct in6_addr	in6;
+};
+
+struct netpoll {
+	struct net_device *dev;
+	char dev_name[IFNAMSIZ];
+	const char *name;
+	void (*rx_hook)(struct netpoll *, int, char *, int);
+
+	union inet_addr local_ip, remote_ip;
+	bool ipv6;
+	u16 local_port, remote_port;
+	u8 remote_mac[ETH_ALEN];
+
+	struct list_head rx; /* rx_np list element */
+	struct work_struct cleanup_work;
+};
+
+struct netpoll_info {
+	atomic_t refcnt;
+
+	unsigned long rx_flags;
+	spinlock_t rx_lock;
+	struct semaphore dev_lock;
+	struct list_head rx_np; /* netpolls that registered an rx_hook */
+
+	struct sk_buff_head neigh_tx; /* list of neigh requests to reply to */
+	struct sk_buff_head txq;
+
+	struct delayed_work tx_work;
+
+	struct netpoll *netpoll;
+	struct rcu_head rcu;
+};
+
+#ifdef CONFIG_NETPOLL
+extern int netpoll_rx_disable(struct net_device *dev);
+extern void netpoll_rx_enable(struct net_device *dev);
+#else
+static inline int netpoll_rx_disable(struct net_device *dev) { return 0; }
+static inline void netpoll_rx_enable(struct net_device *dev) { return; }
+#endif
+
+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, struct net_device *ndev, gfp_t gfp);
+int netpoll_setup(struct netpoll *np);
+int netpoll_trap(void);
+void netpoll_set_trap(int trap);
+void __netpoll_cleanup(struct netpoll *np);
+void __netpoll_free_async(struct netpoll *np);
+void netpoll_cleanup(struct netpoll *np);
+int __netpoll_rx(struct sk_buff *skb, struct netpoll_info *npinfo);
+void netpoll_send_skb_on_dev(struct netpoll *np, struct sk_buff *skb,
+			     struct net_device *dev);
+static inline void netpoll_send_skb(struct netpoll *np, struct sk_buff *skb)
+{
+	unsigned long flags;
+	local_irq_save(flags);
+	netpoll_send_skb_on_dev(np, skb, np->dev);
+	local_irq_restore(flags);
+}
+
+
+
+#ifdef CONFIG_NETPOLL
+static inline bool netpoll_rx_on(struct sk_buff *skb)
+{
+	struct netpoll_info *npinfo = rcu_dereference_bh(skb->dev->npinfo);
+
+	return npinfo && (!list_empty(&npinfo->rx_np) || npinfo->rx_flags);
+}
+
+static inline bool netpoll_rx(struct sk_buff *skb)
+{
+	struct netpoll_info *npinfo;
+	unsigned long flags;
+	bool ret = false;
+
+	local_irq_save(flags);
+
+	if (!netpoll_rx_on(skb))
+		goto out;
+
+	npinfo = rcu_dereference_bh(skb->dev->npinfo);
+	spin_lock(&npinfo->rx_lock);
+	/* check rx_flags again with the lock held */
+	if (npinfo->rx_flags && __netpoll_rx(skb, npinfo))
+		ret = true;
+	spin_unlock(&npinfo->rx_lock);
+
+out:
+	local_irq_restore(flags);
+	return ret;
+}
+
+static inline int netpoll_receive_skb(struct sk_buff *skb)
+{
+	if (!list_empty(&skb->dev->napi_list))
+		return netpoll_rx(skb);
+	return 0;
+}
+
+static inline void *netpoll_poll_lock(struct napi_struct *napi)
+{
+	struct net_device *dev = napi->dev;
+
+	if (dev && dev->npinfo) {
+		spin_lock(&napi->poll_lock);
+		napi->poll_owner = smp_processor_id();
+		return napi;
+	}
+	return NULL;
+}
+
+static inline void netpoll_poll_unlock(void *have)
+{
+	struct napi_struct *napi = have;
+
+	if (napi) {
+		napi->poll_owner = -1;
+		spin_unlock(&napi->poll_lock);
+	}
+}
+
+static inline bool netpoll_tx_running(struct net_device *dev)
+{
+	return irqs_disabled();
+}
+
+#else
+static inline bool netpoll_rx(struct sk_buff *skb)
+{
+	return false;
+}
+static inline bool netpoll_rx_on(struct sk_buff *skb)
+{
+	return false;
+}
+static inline int netpoll_receive_skb(struct sk_buff *skb)
+{
+	return 0;
+}
+static inline void *netpoll_poll_lock(struct napi_struct *napi)
+{
+	return NULL;
+}
+static inline void netpoll_poll_unlock(void *have)
+{
+}
+static inline void netpoll_netdev_init(struct net_device *dev)
+{
+}
+static inline bool netpoll_tx_running(struct net_device *dev)
+{
+	return false;
+}
+#endif
+
+#endif