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Date:	Mon, 07 May 2007 14:10:27 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Herbert Xu <herbert@...dor.apana.org.au>
CC:	Christoph Hellwig <hch@...radead.org>, Andi Kleen <ak@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	virtualization@...ts.osdl.org, lkml <linux-kernel@...r.kernel.org>,
	Chris Wright <chrisw@...s-sol.org>,
	Ian Pratt <ian.pratt@...source.com>,
	Christian Limpach <Christian.Limpach@...cam.ac.uk>,
	netdev@...r.kernel.org, Jeff Garzik <jeff@...zik.org>,
	Stephen Hemminger <shemminge@...ux-foundation.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Keir Fraser <Keir.Fraser@...cam.ac.uk>
Subject: Re: [patch 25/29] xen: Add the Xen virtual network device driver.

Herbert Xu wrote:
> On Sat, May 05, 2007 at 03:05:07AM -0700, Jeremy Fitzhardinge wrote:
>   
>> Sorry, I forgot about it.  I was waiting to hear back from network
>> people about what this is actually for, and whether we really need it. 
>>     
>
> We should just change this to use netif_device_attach and
> netif_device_detach.
>   

Like this?

---
 drivers/net/xen-netfront.c |   28 +++++++++-------------------
 1 file changed, 9 insertions(+), 19 deletions(-)

===================================================================
--- a/drivers/net/xen-netfront.c
+++ b/drivers/net/xen-netfront.c
@@ -95,7 +95,6 @@ struct netfront_info {
 
 	unsigned int evtchn;
 	unsigned int copying_receiver;
-	unsigned int carrier;
 
 	/* Receive-ring batched refills. */
 #define RX_MIN_TARGET 8
@@ -142,15 +141,6 @@ struct netfront_rx_info {
 };
 
 /*
- * Implement our own carrier flag: the network stack's version causes delays
- * when the carrier is re-enabled (in particular, dev_activate() may not
- * immediately be called, which can cause packet loss).
- */
-#define netfront_carrier_on(netif)	((netif)->carrier = 1)
-#define netfront_carrier_off(netif)	((netif)->carrier = 0)
-#define netfront_carrier_ok(netif)	((netif)->carrier)
-
-/*
  * Access macros for acquiring freeing slots in tx_skbs[].
  */
 
@@ -241,7 +231,7 @@ static void xennet_alloc_rx_buffers(stru
 	int nr_flips;
 	struct xen_netif_rx_request *req;
 
-	if (unlikely(!netfront_carrier_ok(np)))
+	if (unlikely(!netif_device_present(dev)))
 		return;
 
 	/*
@@ -380,7 +370,7 @@ static int xennet_open(struct net_device
 	memset(&np->stats, 0, sizeof(np->stats));
 
 	spin_lock_bh(&np->rx_lock);
-	if (netfront_carrier_ok(np)) {
+	if (netif_device_present(dev)) {
 		xennet_alloc_rx_buffers(dev);
 		np->rx.sring->rsp_event = np->rx.rsp_cons + 1;
 		if (RING_HAS_UNCONSUMED_RESPONSES(&np->rx))
@@ -400,7 +390,7 @@ static void xennet_tx_buf_gc(struct net_
 	struct netfront_info *np = netdev_priv(dev);
 	struct sk_buff *skb;
 
-	BUG_ON(!netfront_carrier_ok(np));
+	BUG_ON(!netif_device_present(dev));
 
 	do {
 		prod = np->tx.sring->rsp_prod;
@@ -540,7 +530,7 @@ static int xennet_start_xmit(struct sk_b
 
 	spin_lock_irq(&np->tx_lock);
 
-	if (unlikely(!netfront_carrier_ok(np) ||
+	if (unlikely(!netif_device_present(dev) ||
 		     (frags > 1 && !xennet_can_sg(dev)) ||
 		     netif_needs_gso(dev, skb))) {
 		spin_unlock_irq(&np->tx_lock);
@@ -973,7 +963,7 @@ static int xennet_poll(struct net_device
 
 	spin_lock(&np->rx_lock);
 
-	if (unlikely(!netfront_carrier_ok(np))) {
+	if (unlikely(!netif_device_present(dev))) {
 		spin_unlock(&np->rx_lock);
 		return 0;
 	}
@@ -1308,7 +1298,7 @@ static struct net_device * __devinit xen
 
 	np->netdev = netdev;
 
-	netfront_carrier_off(np);
+	netif_device_detach(netdev);
 
 	return netdev;
 
@@ -1376,7 +1366,7 @@ static void xennet_disconnect_backend(st
 	/* Stop old i/f to prevent errors whilst we rebuild the state. */
 	spin_lock_bh(&info->rx_lock);
 	spin_lock_irq(&info->tx_lock);
-	netfront_carrier_off(info);
+	netif_device_detach(info->netdev);
 	spin_unlock_irq(&info->tx_lock);
 	spin_unlock_bh(&info->rx_lock);
 
@@ -1440,7 +1430,7 @@ static irqreturn_t xennet_interrupt(int 
 
 	spin_lock_irqsave(&np->tx_lock, flags);
 
-	if (likely(netfront_carrier_ok(np))) {
+	if (likely(netif_device_present(dev))) {
 		xennet_tx_buf_gc(dev);
 		/* Under tx_lock: protects access to rx shared-ring indexes. */
 		if (RING_HAS_UNCONSUMED_RESPONSES(&np->rx))
@@ -1728,7 +1718,7 @@ static int xennet_connect(struct net_dev
 	 * domain a kick because we've probably just requeued some
 	 * packets.
 	 */
-	netfront_carrier_on(np);
+	netif_device_attach(np->netdev);
 	notify_remote_via_irq(np->netdev->irq);
 	xennet_tx_buf_gc(dev);
 	xennet_alloc_rx_buffers(dev);

-
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