linux-kernel - [PATCH 2/5] netpoll: cleanup queued transmit

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Date:	Mon, 23 Oct 2006 12:02:59 -0700
From:	Stephen Hemminger <shemminger@...l.org>
To:	David Miller <davem@...emloft.net>
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 2/5] netpoll: cleanup queued transmit

This patch changes the queued transmit path of netpoll, to
use similar logic to the non-queued path. We don't want netpoll
messages going into NIT and network qdisc logic.

Signed-off-by: Stephen Hemminger <shemminger@...l.org>


--- netpoll.orig/net/core/netpoll.c
+++ netpoll/net/core/netpoll.c
@@ -51,13 +51,27 @@ static atomic_t trapped;
 static void zap_completion_queue(void);
 static void arp_reply(struct sk_buff *skb);
 
+static void queue_process(void *);
+static DECLARE_WORK(send_queue, queue_process, NULL);
+
 static void queue_process(void *p)
 {
 	struct sk_buff *skb;
 
-	while ((skb = skb_dequeue(&netpoll_txq)))
-		dev_queue_xmit(skb);
+ 	while ((skb = skb_dequeue(&netpoll_txq))) {
+ 		struct net_device *dev = skb->dev;
 
+ 		netif_tx_lock_bh(dev);
+ 		if (netif_queue_stopped(dev) ||
+ 		    dev->hard_start_xmit(skb, dev) != NETDEV_TX_OK) {
+ 			skb_queue_head(&netpoll_txq, skb);
+ 			netif_tx_unlock_bh(dev);
+
+ 			schedule_delayed_work(&send_queue, 1);
+ 			return;
+ 		}
+ 		netif_tx_unlock_bh(dev);
+ 	}
 }
 
 static void queue_purge(struct net_device *dev)
@@ -77,8 +91,6 @@ static void queue_purge(struct net_devic
 	spin_unlock_irqrestore(&netpoll_txq.lock, flags);
 }
 
-static DECLARE_WORK(send_queue, queue_process, NULL);
-
 void netpoll_queue(struct sk_buff *skb)
 {
 	skb_queue_tail(&netpoll_txq, skb);
-
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