1 files changed, 52 insertions, 9 deletions

diff --git a/net/core/dev.c b/net/core/dev.c
index 5f736f1..8d67597 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -1088,6 +1088,11 @@ int dev_open(struct net_device *dev)
 		dev->flags |= IFF_UP;
 
 		/*
+		 *	Enable NET_DMA
+		 */
+		dmaengine_get();
+
+		/*
 		 *	Initialize multicasting status
 		 */
 		dev_set_rx_mode(dev);
@@ -1164,6 +1169,11 @@ int dev_close(struct net_device *dev)
 	 */
 	call_netdevice_notifiers(NETDEV_DOWN, dev);
 
+	/*
+	 *	Shutdown NET_DMA
+	 */
+	dmaengine_put();
+
 	return 0;
 }
 
@@ -2382,6 +2392,9 @@ int dev_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
 	if (!(skb->dev->features & NETIF_F_GRO))
 		goto normal;
 
+	if (skb_is_gso(skb) || skb_shinfo(skb)->frag_list)
+		goto normal;
+
 	rcu_read_lock();
 	list_for_each_entry_rcu(ptype, head, list) {
 		struct sk_buff *p;
@@ -2478,12 +2491,6 @@ EXPORT_SYMBOL(napi_gro_receive);
 
 void napi_reuse_skb(struct napi_struct *napi, struct sk_buff *skb)
 {
-	skb_shinfo(skb)->nr_frags = 0;
-
-	skb->len -= skb->data_len;
-	skb->truesize -= skb->data_len;
-	skb->data_len = 0;
-
 	__skb_pull(skb, skb_headlen(skb));
 	skb_reserve(skb, NET_IP_ALIGN - skb_headroom(skb));
 
@@ -4424,6 +4431,45 @@ err_uninit:
 }
 
 /**
+ *	init_dummy_netdev	- init a dummy network device for NAPI
+ *	@dev: device to init
+ *
+ *	This takes a network device structure and initialize the minimum
+ *	amount of fields so it can be used to schedule NAPI polls without
+ *	registering a full blown interface. This is to be used by drivers
+ *	that need to tie several hardware interfaces to a single NAPI
+ *	poll scheduler due to HW limitations.
+ */
+int init_dummy_netdev(struct net_device *dev)
+{
+	/* Clear everything. Note we don't initialize spinlocks
+	 * are they aren't supposed to be taken by any of the
+	 * NAPI code and this dummy netdev is supposed to be
+	 * only ever used for NAPI polls
+	 */
+	memset(dev, 0, sizeof(struct net_device));
+
+	/* make sure we BUG if trying to hit standard
+	 * register/unregister code path
+	 */
+	dev->reg_state = NETREG_DUMMY;
+
+	/* initialize the ref count */
+	atomic_set(&dev->refcnt, 1);
+
+	/* NAPI wants this */
+	INIT_LIST_HEAD(&dev->napi_list);
+
+	/* a dummy interface is started by default */
+	set_bit(__LINK_STATE_PRESENT, &dev->state);
+	set_bit(__LINK_STATE_START, &dev->state);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(init_dummy_netdev);
+
+
+/**
  *	register_netdev	- register a network device
  *	@dev: device to register
  *
@@ -5151,9 +5197,6 @@ static int __init net_dev_init(void)
 	hotcpu_notifier(dev_cpu_callback, 0);
 	dst_init();
 	dev_mcast_init();
-	#ifdef CONFIG_NET_DMA
-	dmaengine_get();
-	#endif
 	rc = 0;
 out:
 	return rc;