netpoll: Add netpoll_tx_running
This patch adds the helper netpoll_tx_running for use within
ndo_start_xmit. It returns non-zero if ndo_start_xmit is being
invoked by netpoll, and zero otherwise.
This is currently implemented by simply looking at the hardirq
count. This is because for all non-netpoll uses of ndo_start_xmit,
IRQs must be enabled while netpoll always disables IRQs before
calling ndo_start_xmit.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/netpoll.h b/include/linux/netpoll.h
index f3ad74a..4c77fe7 100644
--- a/include/linux/netpoll.h
+++ b/include/linux/netpoll.h
@@ -116,6 +116,11 @@
}
}
+static inline int netpoll_tx_running(struct net_device *dev)
+{
+ return irqs_disabled();
+}
+
#else
static inline int netpoll_rx(struct sk_buff *skb)
{
@@ -139,6 +144,10 @@
static inline void netpoll_netdev_init(struct net_device *dev)
{
}
+static inline int netpoll_tx_running(struct net_device *dev)
+{
+ return 0;
+}
#endif
#endif