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netpoll: Move netpoll_trap under CONFIG_NETPOLL_TRAP

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Now that we no longer need to receive packets to safely drain the
network drivers receive queue move netpoll_trap and netpoll_set_trap
under CONFIG_NETPOLL_TRAP

Making netpoll_trap and netpoll_set_trap noop inline functions
when CONFIG_NETPOLL_TRAP is not set.

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 20:49:43 -07:00 committed by David S. Miller
parent b6bacd550c
commit ad8d475244
2 changed files with 18 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
include/linux/netpoll.h
View File

@ -65,8 +65,6 @@ 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);
@ -82,11 +80,20 @@ 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);
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;

14
net/core/netpoll.c
View File

@ -46,7 +46,9 @@
static struct sk_buff_head skb_pool;
#ifdef CONFIG_NETPOLL_TRAP
static atomic_t trapped;
#endif
DEFINE_STATIC_SRCU(netpoll_srcu);
@ -207,7 +209,7 @@ static void netpoll_poll_dev(struct net_device *dev)
}
if (rx_processing)
atomic_inc(&trapped);
netpoll_set_trap(1);
ops = dev->netdev_ops;
if (!ops->ndo_poll_controller) {
@ -221,7 +223,7 @@ static void netpoll_poll_dev(struct net_device *dev)
poll_napi(dev, budget);
if (rx_processing)
atomic_dec(&trapped);
netpoll_set_trap(0);
up(&ni->dev_lock);
@ -776,10 +778,10 @@ int __netpoll_rx(struct sk_buff *skb, struct netpoll_info *npinfo)
goto out;
/* check if netpoll clients need ARP */
if (skb->protocol == htons(ETH_P_ARP) && atomic_read(&trapped)) {
if (skb->protocol == htons(ETH_P_ARP) && netpoll_trap()) {
skb_queue_tail(&npinfo->neigh_tx, skb);
return 1;
} else if (pkt_is_ns(skb) && atomic_read(&trapped)) {
} else if (pkt_is_ns(skb) && netpoll_trap()) {
skb_queue_tail(&npinfo->neigh_tx, skb);
return 1;
}
@ -896,7 +898,7 @@ int __netpoll_rx(struct sk_buff *skb, struct netpoll_info *npinfo)
return 1;
out:
if (atomic_read(&trapped)) {
if (netpoll_trap()) {
kfree_skb(skb);
return 1;
}
@ -1302,6 +1304,7 @@ out:
}
EXPORT_SYMBOL(netpoll_cleanup);
#ifdef CONFIG_NETPOLL_TRAP
int netpoll_trap(void)
{
return atomic_read(&trapped);
@ -1316,3 +1319,4 @@ void netpoll_set_trap(int trap)
atomic_dec(&trapped);
}
EXPORT_SYMBOL(netpoll_set_trap);
#endif /* CONFIG_NETPOLL_TRAP */