REPOST: Multiqueue network device support

index 745c988..446de39 100644
@@ -39,7 +39,8 @@ extern void		eth_header_cache_update(struct hh_cache *hh, struct net_device *dev
 extern int		eth_header_cache(struct neighbour *neigh,
 					 struct hh_cache *hh);
 
-extern struct net_device *alloc_etherdev(int sizeof_priv);
+extern struct net_device *alloc_etherdev_mq(int sizeof_priv, int queue_count);
+#define alloc_etherdev(sizeof_priv) alloc_etherdev_mq(sizeof_priv, 1)
 static inline void eth_copy_and_sum (struct sk_buff *dest, 
 				     const unsigned char *src, 
 				     int len, int base)

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index 08fa5c8..96fd263 100644
@@ -212,6 +212,7 @@ typedef unsigned char *sk_buff_data_t;
  *	@pkt_type: Packet class
  *	@fclone: skbuff clone status
  *	@ip_summed: Driver fed us an IP checksum
+ *	@queue_mapping: Queue mapping for multiqueue devices
  *	@priority: Packet queueing priority
  *	@users: User count - see {datagram,tcp}.c
  *	@protocol: Packet protocol from driver

@@ -264,6 +265,7 @@ struct sk_buff {
 		__wsum		csum;
 		__u32		csum_offset;
 	};
+	__u16			queue_mapping;
 	__u32			priority;
 	__u8			local_df:1,
 				cloned:1,

index 219a57f..86c9a89 100644
@@ -3292,16 +3292,18 @@ static struct net_device_stats *maybe_internal_stats(struct net_device *dev)
 }
 
 /**
- *	alloc_netdev - allocate network device
+ *	alloc_netdev_mq - allocate network device
  *	@sizeof_priv:	size of private data to allocate space for
  *	@name:		device name format string
  *	@setup:		callback to initialize device
+ *	@queue_count:	the number of subqueues to allocate
  *
  *	Allocates a struct net_device with private data area for driver use
- *	and performs basic initialization.
+ *	and performs basic initialization.  Also allocates subqueue structs
+ *	for each queue on the device.
  */
-struct net_device *alloc_netdev(int sizeof_priv, const char *name,
-		void (*setup)(struct net_device *))
+struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name,
+		void (*setup)(struct net_device *), int queue_count)
 {
 	void *p;
 	struct net_device *dev;

@@ -3326,12 +3328,23 @@ struct net_device *alloc_netdev(int sizeof_priv, const char *name,
 	if (sizeof_priv)
 		dev->priv = netdev_priv(dev);
 
+ 	alloc_size = (sizeof(struct net_device_subqueue) * queue_count);
+ 
+ 	p = kzalloc(alloc_size, GFP_KERNEL);
+ 	if (!p) {
+ 		printk(KERN_ERR "alloc_netdev: Unable to allocate queues.\n");
+ 		return NULL;
+ 	}
+ 
+ 	dev->egress_subqueue = p;
+ 	dev->egress_subqueue_count = queue_count;
+
 	dev->get_stats = maybe_internal_stats;
 	setup(dev);
 	strcpy(dev->name, name);
 	return dev;
 }
-EXPORT_SYMBOL(alloc_netdev);
+EXPORT_SYMBOL(alloc_netdev_mq);
 
 /**
  *	free_netdev - free network device

@@ -3345,6 +3358,7 @@ void free_netdev(struct net_device *dev)
 {
 #ifdef CONFIG_SYSFS
 	/*  Compatibility with error handling in drivers */
+	kfree((char *)dev->egress_subqueue);
 	if (dev->reg_state == NETREG_UNINITIALIZED) {
 		kfree((char *)dev - dev->padded);
 		return;

@@ -3356,6 +3370,7 @@ void free_netdev(struct net_device *dev)
 	/* will free via device release */
 	put_device(&dev->dev);
 #else
+	kfree((char *)dev->egress_subqueue);
 	kfree((char *)dev - dev->padded);
 #endif
 }

index e60864e..642aab9 100644
@@ -474,6 +474,7 @@ struct sk_buff *skb_clone(struct sk_buff *skb, gfp_t gfp_mask)
 	n->nohdr = 0;
 	C(pkt_type);
 	C(ip_summed);
+	C(queue_mapping);
 	C(priority);
 #if defined(CONFIG_IP_VS) || defined(CONFIG_IP_VS_MODULE)
 	C(ipvs_property);

@@ -516,6 +517,7 @@ static void copy_skb_header(struct sk_buff *new, const struct sk_buff *old)
 #endif
 	new->sk		= NULL;
 	new->dev	= old->dev;
+	new->queue_mapping = old->queue_mapping;
 	new->priority	= old->priority;
 	new->protocol	= old->protocol;
 	new->dst	= dst_clone(old->dst);

@@ -1974,6 +1976,7 @@ struct sk_buff *skb_segment(struct sk_buff *skb, int features)
 		tail = nskb;
 
 		nskb->dev = skb->dev;
+		nskb->queue_mapping = skb->queue_mapping;
 		nskb->priority = skb->priority;
 		nskb->protocol = skb->protocol;
 		nskb->dst = dst_clone(skb->dst);

index 0ac2524..87a509c 100644
@@ -316,9 +316,10 @@ void ether_setup(struct net_device *dev)
 EXPORT_SYMBOL(ether_setup);
 
 /**
- * alloc_etherdev - Allocates and sets up an Ethernet device
+ * alloc_etherdev_mq - Allocates and sets up an Ethernet device
  * @sizeof_priv: Size of additional driver-private structure to be allocated
  *	for this Ethernet device
+ * @queue_count: The number of queues this device has.
  *
  * Fill in the fields of the device structure with Ethernet-generic
  * values. Basically does everything except registering the device.

@@ -328,8 +329,8 @@ EXPORT_SYMBOL(ether_setup);
  * this private data area.
  */
 
-struct net_device *alloc_etherdev(int sizeof_priv)
+struct net_device *alloc_etherdev_mq(int sizeof_priv, int queue_count)
 {
-	return alloc_netdev(sizeof_priv, "eth%d", ether_setup);
+	return alloc_netdev_mq(sizeof_priv, "eth%d", ether_setup, queue_count);
 }
-EXPORT_SYMBOL(alloc_etherdev);
+EXPORT_SYMBOL(alloc_etherdev_mq);

index 52eb343..8f0063a 100644
@@ -133,7 +133,8 @@ static inline int qdisc_restart(struct net_device *dev)
 			/* And release queue */
 			spin_unlock(&dev->queue_lock);
 
-			if (!netif_queue_stopped(dev)) {
+			if (!netif_queue_stopped(dev) &&
+			    !netif_subqueue_stopped(dev, skb->queue_mapping)) {
 				int ret;
 
 				ret = dev_hard_start_xmit(skb, dev);

@@ -149,7 +150,6 @@ static inline int qdisc_restart(struct net_device *dev)
 					goto collision;
 				}
 			}
-
 			/* NETDEV_TX_BUSY - we need to requeue */
 			/* Release the driver */
 			if (!nolock) {

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