d1c76af9e2
As my netpoll fix for net doesn't really work for net-next, we need this update to move the checks into the right place. As it stands we may pass freed skbs to netpoll_receive_skb. This patch also introduces a netpoll_rx_on function to avoid GRO completely if we're invoked through netpoll. This might seem paranoid but as netpoll may have an external receive hook it's better to be safe than sorry. I don't think we need this for 2.6.29 though since there's nothing immediately broken by it. This patch also moves the GRO_* return values to netdevice.h since VLAN needs them too (I tried to avoid this originally but alas this seems to be the easiest way out). This fixes a bug in VLAN where it continued to use the old return value 2 instead of the correct GRO_DROP. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
129 lines
2.8 KiB
C
129 lines
2.8 KiB
C
/*
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* Common code for low-level network console, dump, and debugger code
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*
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* Derived from netconsole, kgdb-over-ethernet, and netdump patches
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*/
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#ifndef _LINUX_NETPOLL_H
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#define _LINUX_NETPOLL_H
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#include <linux/netdevice.h>
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#include <linux/interrupt.h>
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#include <linux/rcupdate.h>
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#include <linux/list.h>
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struct netpoll {
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struct net_device *dev;
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char dev_name[IFNAMSIZ];
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const char *name;
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void (*rx_hook)(struct netpoll *, int, char *, int);
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u32 local_ip, remote_ip;
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u16 local_port, remote_port;
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u8 remote_mac[ETH_ALEN];
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};
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struct netpoll_info {
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atomic_t refcnt;
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int rx_flags;
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spinlock_t rx_lock;
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struct netpoll *rx_np; /* netpoll that registered an rx_hook */
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struct sk_buff_head arp_tx; /* list of arp requests to reply to */
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struct sk_buff_head txq;
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struct delayed_work tx_work;
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};
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void netpoll_poll(struct netpoll *np);
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void netpoll_send_udp(struct netpoll *np, const char *msg, int len);
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void netpoll_print_options(struct netpoll *np);
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int netpoll_parse_options(struct netpoll *np, char *opt);
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int netpoll_setup(struct netpoll *np);
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int netpoll_trap(void);
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void netpoll_set_trap(int trap);
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void netpoll_cleanup(struct netpoll *np);
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int __netpoll_rx(struct sk_buff *skb);
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#ifdef CONFIG_NETPOLL
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static inline int netpoll_rx(struct sk_buff *skb)
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{
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struct netpoll_info *npinfo = skb->dev->npinfo;
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unsigned long flags;
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int ret = 0;
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if (!npinfo || (!npinfo->rx_np && !npinfo->rx_flags))
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return 0;
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spin_lock_irqsave(&npinfo->rx_lock, flags);
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/* check rx_flags again with the lock held */
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if (npinfo->rx_flags && __netpoll_rx(skb))
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ret = 1;
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spin_unlock_irqrestore(&npinfo->rx_lock, flags);
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return ret;
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}
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static inline int netpoll_rx_on(struct sk_buff *skb)
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{
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struct netpoll_info *npinfo = skb->dev->npinfo;
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return npinfo && (npinfo->rx_np || npinfo->rx_flags);
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}
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static inline int netpoll_receive_skb(struct sk_buff *skb)
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{
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if (!list_empty(&skb->dev->napi_list))
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return netpoll_rx(skb);
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return 0;
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}
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static inline void *netpoll_poll_lock(struct napi_struct *napi)
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{
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struct net_device *dev = napi->dev;
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rcu_read_lock(); /* deal with race on ->npinfo */
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if (dev && dev->npinfo) {
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spin_lock(&napi->poll_lock);
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napi->poll_owner = smp_processor_id();
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return napi;
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}
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return NULL;
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}
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static inline void netpoll_poll_unlock(void *have)
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{
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struct napi_struct *napi = have;
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if (napi) {
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napi->poll_owner = -1;
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spin_unlock(&napi->poll_lock);
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}
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rcu_read_unlock();
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}
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#else
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static inline int netpoll_rx(struct sk_buff *skb)
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{
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return 0;
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}
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static inline int netpoll_rx_on(struct sk_buff *skb)
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{
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return 0;
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}
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static inline int netpoll_receive_skb(struct sk_buff *skb)
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{
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return 0;
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}
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static inline void *netpoll_poll_lock(struct napi_struct *napi)
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{
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return NULL;
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}
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static inline void netpoll_poll_unlock(void *have)
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{
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}
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static inline void netpoll_netdev_init(struct net_device *dev)
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{
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}
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#endif
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#endif
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