netdev - [PATCH 7/8] netpoll: Add netpoll_tx

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Message-Id: <E1OMtjl-0006PB-9z@gondolin.me.apana.org.au>
Date:	Fri, 11 Jun 2010 12:12:49 +1000
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	"Michael S. Tsirkin" <mst@...hat.com>,
	Qianfeng Zhang <frzhang@...hat.com>,
	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	WANG Cong <amwang@...hat.com>,
	Stephen Hemminger <shemminger@...tta.com>,
	Matt Mackall <mpm@...enic.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: [PATCH 7/8] netpoll: Add netpoll_tx_running

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@...dor.apana.org.au>
---

 include/linux/netpoll.h |    9 +++++++++
 1 file changed, 9 insertions(+)

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 void netpoll_poll_unlock(void *have)
 	}
 }
 
+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_poll_unlock(void *have)
 static inline void netpoll_netdev_init(struct net_device *dev)
 {
 }
+static inline int netpoll_tx_running(struct net_device *dev)
+{
+	return 0;
+}
 #endif
 
 #endif
--
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