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netpoll: Add netpoll_rx_processing 

Add a helper netpoll_rx_processing that reports when netpoll has
receive side processing to perform.

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 20:47:49 -07:00 committed by David S. Miller
parent e97dc3fcf9
commit ff60763143
2 changed files with 16 additions and 6 deletions
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18
include/linux/netpoll.h
View File

@ -82,14 +82,24 @@ static inline void netpoll_send_skb(struct netpoll *np, struct sk_buff *skb)
local_irq_restore(flags);
}
#ifdef CONFIG_NETPOLL_TRAP
static inline bool netpoll_rx_processing(struct netpoll_info *npinfo)
{
return !list_empty(&npinfo->rx_np);
}
#else
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);
return npinfo && (!list_empty(&npinfo->rx_np) || npinfo->rx_flags);
return npinfo && (netpoll_rx_processing(npinfo) || npinfo->rx_flags);
}
static inline bool netpoll_rx(struct sk_buff *skb)
@ -105,8 +115,8 @@ static inline bool netpoll_rx(struct sk_buff *skb)
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))
/* check rx_processing again with the lock held */
if (netpoll_rx_processing(npinfo) && __netpoll_rx(skb, npinfo))
ret = true;
spin_unlock(&npinfo->rx_lock);

4
net/core/netpoll.c
View File

@ -538,7 +538,7 @@ static void netpoll_neigh_reply(struct sk_buff *skb, struct netpoll_info *npinfo
int hlen, tlen;
int hits = 0, proto;
if (list_empty(&npinfo->rx_np))
if (!netpoll_rx_processing(npinfo))
return;
/* Before checking the packet, we do some early
@ -770,7 +770,7 @@ int __netpoll_rx(struct sk_buff *skb, struct netpoll_info *npinfo)
struct netpoll *np, *tmp;
uint16_t source;
if (list_empty(&npinfo->rx_np))
if (!netpoll_rx_processing(npinfo))
goto out;
if (skb->dev->type != ARPHRD_ETHER)