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netpoll: Move all receive processing under CONFIG_NETPOLL_TRAP

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Make rx_skb_hook, and rx in struct netpoll depend on
CONFIG_NETPOLL_TRAP Make rx_lock, rx_np, and neigh_tx in struct
netpoll_info depend on CONFIG_NETPOLL_TRAP

Make the functions netpoll_rx_on, netpoll_rx, and netpoll_receive_skb
no-ops when CONFIG_NETPOLL_TRAP is not set.

Only build netpoll_neigh_reply, checksum_udp service_neigh_queue,
pkt_is_ns, and __netpoll_rx when CONFIG_NETPOLL_TRAP is defined.

Add helper functions netpoll_trap_setup, netpoll_trap_setup_info,
netpoll_trap_cleanup, and netpoll_trap_cleanup_info that initialize
and cleanup the struct netpoll and struct netpoll_info receive
specific fields when CONFIG_NETPOLL_TRAP is enabled and do nothing
otherwise.

Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric W. Biederman
2014-03-14 20:50:58 -07:00
committed by David S. Miller
parent 18b37535f8
commit e1bd4d3d7d
2 changed files with 104 additions and 50 deletions
Download Patch File Download Diff File Expand all files Collapse all files

73
include/linux/netpoll.h
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@@ -24,32 +24,38 @@ struct netpoll {
struct net_device *dev;
char dev_name[IFNAMSIZ];
const char *name;
void (*rx_skb_hook)(struct netpoll *np, int source, struct sk_buff *skb,
int offset, int len);
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;
#ifdef CONFIG_NETPOLL_TRAP
void (*rx_skb_hook)(struct netpoll *np, int source, struct sk_buff *skb,
int offset, int len);
struct list_head rx; /* rx_np list element */
#endif
};
struct netpoll_info {
atomic_t refcnt;
spinlock_t rx_lock;
struct semaphore dev_lock;
struct list_head rx_np; /* netpolls that registered an rx_skb_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_TRAP
spinlock_t rx_lock;
struct list_head rx_np; /* netpolls that registered an rx_skb_hook */
struct sk_buff_head neigh_tx; /* list of neigh requests to reply to */
#endif
};
#ifdef CONFIG_NETPOLL
@@ -68,7 +74,6 @@ int netpoll_setup(struct netpoll *np);
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)
@@ -82,25 +87,12 @@ static inline void netpoll_send_skb(struct netpoll *np, struct sk_buff *skb)
#ifdef CONFIG_NETPOLL_TRAP
int netpoll_trap(void);
void netpoll_set_trap(int trap);
int __netpoll_rx(struct sk_buff *skb, struct netpoll_info *npinfo);
static inline bool netpoll_rx_processing(struct netpoll_info *npinfo)
{
return !list_empty(&npinfo->rx_np);
}
#else
static inline int netpoll_trap(void)
{
return 0;
}
static inline void netpoll_set_trap(int trap)
{
}
static inline bool netpoll_rx_processing(struct netpoll_info *npinfo)
{
return false;
}
#endif
#ifdef CONFIG_NETPOLL
static inline bool netpoll_rx_on(struct sk_buff *skb)
{
struct netpoll_info *npinfo = rcu_dereference_bh(skb->dev->npinfo);
@@ -138,6 +130,33 @@ static inline int netpoll_receive_skb(struct sk_buff *skb)
return 0;
}
#else
static inline int netpoll_trap(void)
{
return 0;
}
static inline void netpoll_set_trap(int trap)
{
}
static inline bool netpoll_rx_processing(struct netpoll_info *npinfo)
{
return false;
}
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;
}
#endif
#ifdef CONFIG_NETPOLL
static inline void *netpoll_poll_lock(struct napi_struct *napi)
{
struct net_device *dev = napi->dev;
@@ -166,18 +185,6 @@ static inline bool netpoll_tx_running(struct net_device *dev)
}
#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;