diff --git a/drivers/net/xen-netback/interface.c b/drivers/net/xen-netback/interface.c
index b9de31e..1809728 100644
--- a/drivers/net/xen-netback/interface.c
+++ b/drivers/net/xen-netback/interface.c
@@ -122,9 +122,13 @@ static int xenvif_start_xmit(struct sk_buff *skb, struct net_device *dev)
 	BUG_ON(skb->dev != dev);
 
 	/* Drop the packet if vif is not ready */
-	if (vif->task == NULL || !xenvif_schedulable(vif))
+	if (vif->task == NULL || !xenvif_schedulable(vif)){
+                if (net_ratelimit())
+                        netdev_warn(vif->dev, "?!? %s dropping packet vif not ready !  min_slots_needed:%d vif->rx.sring->req_prod:%d vif->rx.req_cons:%d\n", __FUNCTION__, min_slots_needed, vif->rx.sring->req_prod, vif->rx.req_cons);
+	
 		goto drop;
-
+	}
+	
 	/* At best we'll need one slot for the header and one for each
 	 * frag.
 	 */
@@ -133,16 +137,19 @@ static int xenvif_start_xmit(struct sk_buff *skb, struct net_device *dev)
 	/* If the skb is GSO then we'll also need an extra slot for the
 	 * metadata.
 	 */
-	if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4 ||
-	    skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6)
+	if (skb_is_gso(skb))
 		min_slots_needed++;
 
 	/* If the skb can't possibly fit in the remaining slots
 	 * then turn off the queue to give the ring a chance to
 	 * drain.
 	 */
-	if (!xenvif_rx_ring_slots_available(vif, min_slots_needed))
+	if (!xenvif_rx_ring_slots_available(vif, min_slots_needed)){
+                if (net_ratelimit())
+                        netdev_warn(vif->dev, "?!? %s stopping queue !  min_slots_needed:%d vif->rx.sring->req_prod:%d vif->rx.req_cons:%d\n", __FUNCTION__, min_slots_needed, vif->rx.sring->req_prod, vif->rx.req_cons);
+
 		xenvif_stop_queue(vif);
+	}
 
 	skb_queue_tail(&vif->rx_queue, skb);
 	xenvif_kick_thread(vif);
diff --git a/drivers/net/xen-netback/netback.c b/drivers/net/xen-netback/netback.c
index 98de8ab..2f86a63 100644
--- a/drivers/net/xen-netback/netback.c
+++ b/drivers/net/xen-netback/netback.c
@@ -157,6 +157,8 @@ bool xenvif_rx_ring_slots_available(struct xenvif *vif, int needed)
 		mb();
 	} while (vif->rx.sring->req_prod != prod);
 
+       	if((vif->rx.req_cons > vif->rx.sring->req_prod) && net_ratelimit()){netdev_warn(vif->dev, "?!? %s slotsavailable: false vif->rx.sring->req_prod:%d vif->rx.req_cons:%d vif->rx.sring->req_event:%d needed:%d",__FUNCTION__, vif->rx.sring->req_prod, vif->rx.req_cons, vif->rx.sring->req_event, needed);}
+
 	return false;
 }
 
@@ -215,7 +217,9 @@ static struct xenvif_rx_meta *get_next_rx_buffer(struct xenvif *vif,
 	struct xenvif_rx_meta *meta;
 	struct xen_netif_rx_request *req;
 
+	if((vif->rx.req_cons + 1 > vif->rx.sring->req_prod) && net_ratelimit()){netdev_warn(vif->dev, "?!? %s before req npo->meta_prod:%d vif->rx.sring->req_prod:%d vif->rx.req_cons:%d", __FUNCTION__, npo->meta_prod , vif->rx.sring->req_prod, vif->rx.req_cons + 1);}
 	req = RING_GET_REQUEST(&vif->rx, vif->rx.req_cons++);
+	if((vif->rx.req_cons > vif->rx.sring->req_prod) && net_ratelimit()){netdev_warn(vif->dev, "?!? %s after req npo->meta_prod:%d vif->rx.sring->req_prod:%d vif->rx.req_cons:%d req->gref:%d req->id:%d", __FUNCTION__, npo->meta_prod , vif->rx.sring->req_prod, vif->rx.req_cons, req->gref, req->id);}
 
 	meta = npo->meta + npo->meta_prod++;
 	meta->gso_type = XEN_NETIF_GSO_TYPE_NONE;
@@ -241,7 +245,7 @@ static void xenvif_gop_frag_copy(struct xenvif *vif, struct sk_buff *skb,
 	struct gnttab_copy *copy_gop;
 	struct xenvif_rx_meta *meta;
 	unsigned long bytes;
-	int gso_type;
+	int gso_type = XEN_NETIF_GSO_TYPE_NONE;
 
 	/* Data must not cross a page boundary. */
 	BUG_ON(size + offset > PAGE_SIZE<<compound_order(page));
@@ -267,8 +271,10 @@ static void xenvif_gop_frag_copy(struct xenvif *vif, struct sk_buff *skb,
 			 * buffer.
 			 */
 			BUG_ON(*head);
-
+			if((vif->rx.req_cons > vif->rx.sring->req_prod) && net_ratelimit()){netdev_warn(vif->dev, "?!? %s Me here 1  npo->meta_prod:%d vif->rx.sring->req_prod:%d vif->rx.req_cons:%d npo->copy_gref:%d", __FUNCTION__,npo->meta_prod, vif->rx.sring->req_prod, vif->rx.req_cons, npo->copy_gref);}
 			meta = get_next_rx_buffer(vif, npo);
+			if((vif->rx.req_cons > vif->rx.sring->req_prod) && net_ratelimit()){netdev_warn(vif->dev, "?!? %s Me here 2  npo->meta_prod:%d vif->rx.sring->req_prod:%d vif->rx.req_cons:%d npo->copy_gref:%d", __FUNCTION__,npo->meta_prod, vif->rx.sring->req_prod, vif->rx.req_cons, npo->copy_gref);}
+
 		}
 
 		if (npo->copy_off + bytes > MAX_BUFFER_OFFSET)
@@ -300,16 +306,17 @@ static void xenvif_gop_frag_copy(struct xenvif *vif, struct sk_buff *skb,
 		}
 
 		/* Leave a gap for the GSO descriptor. */
-		if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4)
-			gso_type = XEN_NETIF_GSO_TYPE_TCPV4;
-		else if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6)
-			gso_type = XEN_NETIF_GSO_TYPE_TCPV6;
-		else
-			gso_type = XEN_NETIF_GSO_TYPE_NONE;
+		if (skb_is_gso(skb)) {
+			if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4)
+				gso_type = XEN_NETIF_GSO_TYPE_TCPV4;
+			else if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6)
+				gso_type = XEN_NETIF_GSO_TYPE_TCPV6;
+		}
 
-		if (*head && ((1 << gso_type) & vif->gso_mask))
+		if (*head && ((1 << gso_type) & vif->gso_mask)){
 			vif->rx.req_cons++;
-
+			if((vif->rx.req_cons > vif->rx.sring->req_prod) && net_ratelimit()){netdev_warn(vif->dev, "?!? %s  Me here 3  npo->meta_prod:%d vif->rx.sring->req_prod:%d vif->rx.req_cons:%d gso_type:%d npo->copy_gref:%d", __FUNCTION__,npo->meta_prod, vif->rx.sring->req_prod, vif->rx.req_cons, skb_shinfo(skb)->gso_type, npo->copy_gref);}	
+		}
 		*head = 0; /* There must be something in this buffer now. */
 
 	}
@@ -339,37 +346,37 @@ static int xenvif_gop_skb(struct sk_buff *skb,
 	int head = 1;
 	int old_meta_prod;
 	int gso_type;
-	int gso_size;
 
 	old_meta_prod = npo->meta_prod;
 
-	if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4) {
-		gso_type = XEN_NETIF_GSO_TYPE_TCPV4;
-		gso_size = skb_shinfo(skb)->gso_size;
-	} else if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6) {
-		gso_type = XEN_NETIF_GSO_TYPE_TCPV6;
-		gso_size = skb_shinfo(skb)->gso_size;
-	} else {
-		gso_type = XEN_NETIF_GSO_TYPE_NONE;
-		gso_size = 0;
+	gso_type = XEN_NETIF_GSO_TYPE_NONE;
+	if (skb_is_gso(skb)) {
+		if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4)
+			gso_type = XEN_NETIF_GSO_TYPE_TCPV4;
+		else if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6)
+			gso_type = XEN_NETIF_GSO_TYPE_TCPV6;
 	}
 
 	/* Set up a GSO prefix descriptor, if necessary */
 	if ((1 << gso_type) & vif->gso_prefix_mask) {
+        	if((vif->rx.req_cons + 1 > vif->rx.sring->req_prod) && net_ratelimit()){netdev_warn(vif->dev, "?!? %s Me here 1 before req npo->meta_prod:%d vif->rx.sring->req_prod:%d vif->rx.req_cons:%d gso_type:%d gso_size:%d nr_frags:%d", __FUNCTION__,npo->meta_prod , vif->rx.sring->req_prod, vif->rx.req_cons + 1, skb_shinfo(skb)->gso_type, skb_shinfo(skb)->gso_size, nr_frags);}
 		req = RING_GET_REQUEST(&vif->rx, vif->rx.req_cons++);
+        	if((vif->rx.req_cons > vif->rx.sring->req_prod) && net_ratelimit()){netdev_warn(vif->dev, "?!? %s Me here 1 after req npo->meta_prod:%d vif->rx.sring->req_prod:%d vif->rx.req_cons:%d gso_type:%d gso_size:%d nr_frags:%d req->gref:%d req->id:%d", __FUNCTION__,npo->meta_prod , vif->rx.sring->req_prod, vif->rx.req_cons , skb_shinfo(skb)->gso_type, skb_shinfo(skb)->gso_size, nr_frags, req->gref, req->id);}
 		meta = npo->meta + npo->meta_prod++;
 		meta->gso_type = gso_type;
-		meta->gso_size = gso_size;
+		meta->gso_size = skb_shinfo(skb)->gso_size;
 		meta->size = 0;
 		meta->id = req->id;
 	}
-
+       	if((vif->rx.req_cons + 1 > vif->rx.sring->req_prod) && net_ratelimit()){netdev_warn(vif->dev, "?!? %s Me here 2 before req npo->meta_prod:%d vif->rx.sring->req_prod:%d vif->rx.req_cons:%d gso_type:%d gso_size:%d nr_frags:%d", __FUNCTION__,npo->meta_prod , vif->rx.sring->req_prod, vif->rx.req_cons + 1, skb_shinfo(skb)->gso_type, skb_shinfo(skb)->gso_size, nr_frags);}
 	req = RING_GET_REQUEST(&vif->rx, vif->rx.req_cons++);
+       	if((vif->rx.req_cons > vif->rx.sring->req_prod) && net_ratelimit()){netdev_warn(vif->dev, "?!? %s Me here 2 after req npo->meta_prod:%d vif->rx.sring->req_prod:%d vif->rx.req_cons:%d gso_type:%d gso_size:%d nr_frags:%d req->gref:%d req->id:%d", __FUNCTION__,npo->meta_prod , vif->rx.sring->req_prod, vif->rx.req_cons, skb_shinfo(skb)->gso_type, skb_shinfo(skb)->gso_size, nr_frags, req->gref, req->id);}
+
 	meta = npo->meta + npo->meta_prod++;
 
 	if ((1 << gso_type) & vif->gso_mask) {
 		meta->gso_type = gso_type;
-		meta->gso_size = gso_size;
+		meta->gso_size = skb_shinfo(skb)->gso_size;
 	} else {
 		meta->gso_type = XEN_NETIF_GSO_TYPE_NONE;
 		meta->gso_size = 0;
@@ -380,6 +387,7 @@ static int xenvif_gop_skb(struct sk_buff *skb,
 	npo->copy_off = 0;
 	npo->copy_gref = req->gref;
 
+
 	data = skb->data;
 	while (data < skb_tail_pointer(skb)) {
 		unsigned int offset = offset_in_page(data);
@@ -401,6 +409,8 @@ static int xenvif_gop_skb(struct sk_buff *skb,
 				     &head);
 	}
 
+       	if((vif->rx.req_cons > vif->rx.sring->req_prod) && net_ratelimit()){netdev_warn(vif->dev, "?!? %s Me here 3 npo->meta_prod:%d old_meta_prod:%d vif->rx.sring->req_prod:%d vif->rx.req_cons:%d gso_type:%d gso_size:%d nr_frags:%d req->gref:%d req->id:%d", __FUNCTION__,npo->meta_prod , old_meta_prod,vif->rx.sring->req_prod, vif->rx.req_cons, skb_shinfo(skb)->gso_type, skb_shinfo(skb)->gso_size, nr_frags, req->gref, req->id);}
+
 	return npo->meta_prod - old_meta_prod;
 }
 
@@ -420,11 +430,14 @@ static int xenvif_check_gop(struct xenvif *vif, int nr_meta_slots,
 	for (i = 0; i < nr_meta_slots; i++) {
 		copy_op = npo->copy + npo->copy_cons++;
 		if (copy_op->status != GNTST_okay) {
-			netdev_dbg(vif->dev,
+                    if (net_ratelimit()){
+			netdev_warn(vif->dev,
 				   "Bad status %d from copy to DOM%d.\n",
 				   copy_op->status, vif->domid);
 			status = XEN_NETIF_RSP_ERROR;
-		}
+                        netdev_warn(vif->dev, "?!? %s status err? status:%d i:%d nr_meta_slots:%d copy_op->status:%d npo->copy_cons:%d  \n", __FUNCTION__,status, i, nr_meta_slots, copy_op->status, npo->copy_cons );
+		    }
+       		}
 	}
 
 	return status;
@@ -451,8 +464,14 @@ static void xenvif_add_frag_responses(struct xenvif *vif, int status,
 			flags = XEN_NETRXF_more_data;
 
 		offset = 0;
+
+                if(status > 10000 || status < 0){
+                    if (net_ratelimit())
+                        netdev_warn(vif->dev, "?!? %s status err? status:%d i:%d nr_meta_slots:%d flags:%d size:%d\n", __FUNCTION__,status, i, nr_meta_slots, flags, meta[i].size);
+                }
 		make_rx_response(vif, meta[i].id, status, offset,
 				 meta[i].size, flags);
+	
 	}
 }
 
@@ -501,12 +520,15 @@ static void xenvif_rx_action(struct xenvif *vif)
 			size = skb_frag_size(&skb_shinfo(skb)->frags[i]);
 			max_slots_needed += DIV_ROUND_UP(size, PAGE_SIZE);
 		}
-		if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4 ||
-		    skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6)
+		if (skb_is_gso(skb) &&
+		   (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4 ||
+		    skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6))
 			max_slots_needed++;
 
 		/* If the skb may not fit then bail out now */
 		if (!xenvif_rx_ring_slots_available(vif, max_slots_needed)) {
+
+
 			skb_queue_head(&vif->rx_queue, skb);
 			need_to_notify = 1;
 			break;
@@ -514,6 +536,9 @@ static void xenvif_rx_action(struct xenvif *vif)
 
 		sco = (struct skb_cb_overlay *)skb->cb;
 		sco->meta_slots_used = xenvif_gop_skb(skb, &npo);
+
+
+
 		BUG_ON(sco->meta_slots_used > max_slots_needed);
 
 		__skb_queue_tail(&rxq, skb);
@@ -521,8 +546,10 @@ static void xenvif_rx_action(struct xenvif *vif)
 
 	BUG_ON(npo.meta_prod > ARRAY_SIZE(vif->meta));
 
-	if (!npo.copy_prod)
+	if (!npo.copy_prod){
+	        if((vif->rx.req_cons > vif->rx.sring->req_prod) && net_ratelimit()){netdev_warn(vif->dev, "?!? %s go to done ..  vif->rx.sring->req_prod:%d vif->rx.req_cons:%d", __FUNCTION__, vif->rx.sring->req_prod, vif->rx.req_cons);}
 		goto done;
+	}
 
 	BUG_ON(npo.copy_prod > MAX_GRANT_COPY_OPS);
 	gnttab_batch_copy(vif->grant_copy_op, npo.copy_prod);
@@ -551,6 +578,8 @@ static void xenvif_rx_action(struct xenvif *vif)
 
 		status = xenvif_check_gop(vif, sco->meta_slots_used, &npo);
 
+
+
 		if (sco->meta_slots_used == 1)
 			flags = 0;
 		else
@@ -563,6 +592,12 @@ static void xenvif_rx_action(struct xenvif *vif)
 			flags |= XEN_NETRXF_data_validated;
 
 		offset = 0;
+
+                if(status > 10000 || status < 0){
+                    if (net_ratelimit())
+                        netdev_warn(vif->dev, "?!? %s status err? status:%d meta_slots_used:%d flags:%d size:%d ip_summed:%d is_gso:%d skb_shinfo(skb)->gso_type:%d vif->meta[npo.meta_cons].gso_type:%d nr_frags:%d npo.copy_prod:%d, npo.meta_cons:%d\n", __FUNCTION__,status, sco->meta_slots_used, flags, skb_is_gso(skb) , skb_shinfo(skb)->gso_type, vif->meta[npo.meta_cons].gso_type, vif->meta[npo.meta_cons].size, skb->ip_summed, skb_shinfo(skb)->nr_frags , npo.copy_prod, npo.meta_cons);
+                }
+		
 		resp = make_rx_response(vif, vif->meta[npo.meta_cons].id,
 					status, offset,
 					vif->meta[npo.meta_cons].size,
@@ -600,8 +635,10 @@ static void xenvif_rx_action(struct xenvif *vif)
 	}
 
 done:
-	if (need_to_notify)
+	if (need_to_notify){
+	        if((vif->rx.req_cons > vif->rx.sring->req_prod) && net_ratelimit()){netdev_warn(vif->dev, "?!? %s need to notify ..  vif->rx.sring->req_prod:%d vif->rx.req_cons:%d", __FUNCTION__, vif->rx.sring->req_prod, vif->rx.req_cons);}
 		notify_remote_via_irq(vif->rx_irq);
+	}
 }
 
 void xenvif_check_rx_xenvif(struct xenvif *vif)
@@ -705,7 +742,7 @@ static int xenvif_count_requests(struct xenvif *vif,
 		 */
 		if (!drop_err && slots >= XEN_NETBK_LEGACY_SLOTS_MAX) {
 			if (net_ratelimit())
-				netdev_dbg(vif->dev,
+				netdev_warn(vif->dev,
 					   "Too many slots (%d) exceeding limit (%d), dropping packet\n",
 					   slots, XEN_NETBK_LEGACY_SLOTS_MAX);
 			drop_err = -E2BIG;
@@ -713,7 +750,6 @@ static int xenvif_count_requests(struct xenvif *vif,
 
 		if (drop_err)
 			txp = &dropped_tx;
-
 		memcpy(txp, RING_GET_REQUEST(&vif->tx, cons + slots),
 		       sizeof(*txp));
 
@@ -728,7 +764,7 @@ static int xenvif_count_requests(struct xenvif *vif,
 		 */
 		if (!drop_err && txp->size > first->size) {
 			if (net_ratelimit())
-				netdev_dbg(vif->dev,
+				netdev_warn(vif->dev,
 					   "Invalid tx request, slot size %u > remaining size %u\n",
 					   txp->size, first->size);
 			drop_err = -EIO;
@@ -823,6 +859,12 @@ static struct gnttab_copy *xenvif_get_requests(struct xenvif *vif,
 			gop->dest.offset = dst_offset;
 			gop->dest.u.gmfn = virt_to_mfn(page_address(page));
 
+                        if(txp->gref > 10000 || txp->gref <=0){
+	                     if (net_ratelimit())
+                                 netdev_warn(vif->dev, "?!? %s ref out of bounds? gref:%d srcdomid:%d dstdomid:%d slot:%d nr_slots:%d\n",__FUNCTION__, txp->gref, vif->domid, DOMID_SELF, slot, nr_slots);
+                        }
+	
+
 			if (dst_offset + txp->size > PAGE_SIZE) {
 				/* This page can only merge a portion
 				 * of tx request. Do not increment any
@@ -1000,7 +1042,6 @@ static int xenvif_get_extras(struct xenvif *vif,
 			xenvif_fatal_tx_err(vif);
 			return -EBADR;
 		}
-
 		memcpy(&extra, RING_GET_REQUEST(&vif->tx, cons),
 		       sizeof(extra));
 		if (unlikely(!extra.type ||
@@ -1393,6 +1434,7 @@ static unsigned xenvif_tx_build_gops(struct xenvif *vif, int budget)
 			break;
 
 		idx = vif->tx.req_cons;
+
 		rmb(); /* Ensure that we see the request before we copy it. */
 		memcpy(&txreq, RING_GET_REQUEST(&vif->tx, idx), sizeof(txreq));
 
@@ -1422,8 +1464,9 @@ static unsigned xenvif_tx_build_gops(struct xenvif *vif, int budget)
 		idx += ret;
 
 		if (unlikely(txreq.size < ETH_HLEN)) {
-			netdev_dbg(vif->dev,
-				   "Bad packet size: %d\n", txreq.size);
+			if (net_ratelimit())
+				netdev_warn(vif->dev,
+					   "Bad packet size: %d\n", txreq.size);
 			xenvif_tx_err(vif, &txreq, idx);
 			break;
 		}
@@ -1448,8 +1491,9 @@ static unsigned xenvif_tx_build_gops(struct xenvif *vif, int budget)
 		skb = alloc_skb(data_len + NET_SKB_PAD + NET_IP_ALIGN,
 				GFP_ATOMIC | __GFP_NOWARN);
 		if (unlikely(skb == NULL)) {
-			netdev_dbg(vif->dev,
-				   "Can't allocate a skb in start_xmit.\n");
+			if (net_ratelimit())
+				netdev_warn(vif->dev,
+					   "Can't allocate a skb in start_xmit.\n");
 			xenvif_tx_err(vif, &txreq, idx);
 			break;
 		}
@@ -1544,7 +1588,8 @@ static int xenvif_tx_submit(struct xenvif *vif)
 
 		/* Check the remap error code. */
 		if (unlikely(xenvif_tx_check_gop(vif, skb, &gop))) {
-			netdev_dbg(vif->dev, "netback grant failed.\n");
+			if (net_ratelimit())
+				netdev_warn(vif->dev, "netback grant failed.\n");
 			skb_shinfo(skb)->nr_frags = 0;
 			kfree_skb(skb);
 			continue;
@@ -1581,8 +1626,9 @@ static int xenvif_tx_submit(struct xenvif *vif)
 		skb_reset_network_header(skb);
 
 		if (checksum_setup(vif, skb)) {
-			netdev_dbg(vif->dev,
-				   "Can't setup checksum in net_tx_action\n");
+			if (net_ratelimit())
+				netdev_warn(vif->dev,
+					   "Can't setup checksum in net_tx_action\n");
 			kfree_skb(skb);
 			continue;
 		}