Moved, renamed, and deleted files

The original directory structure was scattered and unorganized.
Changes are basically to make it look like kernel structure.

1 files changed, 0 insertions, 1990 deletions

diff --git a/ANDROID_3.4.5/drivers/net/xen-netfront.c b/ANDROID_3.4.5/drivers/net/xen-netfront.c
deleted file mode 100644
index 796afbf1..00000000
--- a/ANDROID_3.4.5/drivers/net/xen-netfront.c
+++ /dev/null
@@ -1,1990 +0,0 @@
-/*
- * Virtual network driver for conversing with remote driver backends.
- *
- * Copyright (c) 2002-2005, K A Fraser
- * Copyright (c) 2005, XenSource Ltd
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License version 2
- * as published by the Free Software Foundation; or, when distributed
- * separately from the Linux kernel or incorporated into other
- * software packages, subject to the following license:
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this source file (the "Software"), to deal in the Software without
- * restriction, including without limitation the rights to use, copy, modify,
- * merge, publish, distribute, sublicense, and/or sell copies of the Software,
- * and to permit persons to whom the Software is furnished to do so, subject to
- * the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
- * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
- * IN THE SOFTWARE.
- */
-
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/netdevice.h>
-#include <linux/etherdevice.h>
-#include <linux/skbuff.h>
-#include <linux/ethtool.h>
-#include <linux/if_ether.h>
-#include <linux/tcp.h>
-#include <linux/udp.h>
-#include <linux/moduleparam.h>
-#include <linux/mm.h>
-#include <linux/slab.h>
-#include <net/ip.h>
-
-#include <xen/xen.h>
-#include <xen/xenbus.h>
-#include <xen/events.h>
-#include <xen/page.h>
-#include <xen/platform_pci.h>
-#include <xen/grant_table.h>
-
-#include <xen/interface/io/netif.h>
-#include <xen/interface/memory.h>
-#include <xen/interface/grant_table.h>
-
-static const struct ethtool_ops xennet_ethtool_ops;
-
-struct netfront_cb {
-	struct page *page;
-	unsigned offset;
-};
-
-#define NETFRONT_SKB_CB(skb)	((struct netfront_cb *)((skb)->cb))
-
-#define RX_COPY_THRESHOLD 256
-
-#define GRANT_INVALID_REF	0
-
-#define NET_TX_RING_SIZE __CONST_RING_SIZE(xen_netif_tx, PAGE_SIZE)
-#define NET_RX_RING_SIZE __CONST_RING_SIZE(xen_netif_rx, PAGE_SIZE)
-#define TX_MAX_TARGET min_t(int, NET_TX_RING_SIZE, 256)
-
-struct netfront_stats {
-	u64			rx_packets;
-	u64			tx_packets;
-	u64			rx_bytes;
-	u64			tx_bytes;
-	struct u64_stats_sync	syncp;
-};
-
-struct netfront_info {
-	struct list_head list;
-	struct net_device *netdev;
-
-	struct napi_struct napi;
-
-	unsigned int evtchn;
-	struct xenbus_device *xbdev;
-
-	spinlock_t   tx_lock;
-	struct xen_netif_tx_front_ring tx;
-	int tx_ring_ref;
-
-	/*
-	 * {tx,rx}_skbs store outstanding skbuffs. Free tx_skb entries
-	 * are linked from tx_skb_freelist through skb_entry.link.
-	 *
-	 *  NB. Freelist index entries are always going to be less than
-	 *  PAGE_OFFSET, whereas pointers to skbs will always be equal or
-	 *  greater than PAGE_OFFSET: we use this property to distinguish
-	 *  them.
-	 */
-	union skb_entry {
-		struct sk_buff *skb;
-		unsigned long link;
-	} tx_skbs[NET_TX_RING_SIZE];
-	grant_ref_t gref_tx_head;
-	grant_ref_t grant_tx_ref[NET_TX_RING_SIZE];
-	unsigned tx_skb_freelist;
-
-	spinlock_t   rx_lock ____cacheline_aligned_in_smp;
-	struct xen_netif_rx_front_ring rx;
-	int rx_ring_ref;
-
-	/* Receive-ring batched refills. */
-#define RX_MIN_TARGET 8
-#define RX_DFL_MIN_TARGET 64
-#define RX_MAX_TARGET min_t(int, NET_RX_RING_SIZE, 256)
-	unsigned rx_min_target, rx_max_target, rx_target;
-	struct sk_buff_head rx_batch;
-
-	struct timer_list rx_refill_timer;
-
-	struct sk_buff *rx_skbs[NET_RX_RING_SIZE];
-	grant_ref_t gref_rx_head;
-	grant_ref_t grant_rx_ref[NET_RX_RING_SIZE];
-
-	unsigned long rx_pfn_array[NET_RX_RING_SIZE];
-	struct multicall_entry rx_mcl[NET_RX_RING_SIZE+1];
-	struct mmu_update rx_mmu[NET_RX_RING_SIZE];
-
-	/* Statistics */
-	struct netfront_stats __percpu *stats;
-
-	unsigned long rx_gso_checksum_fixup;
-};
-
-struct netfront_rx_info {
-	struct xen_netif_rx_response rx;
-	struct xen_netif_extra_info extras[XEN_NETIF_EXTRA_TYPE_MAX - 1];
-};
-
-static void skb_entry_set_link(union skb_entry *list, unsigned short id)
-{
-	list->link = id;
-}
-
-static int skb_entry_is_link(const union skb_entry *list)
-{
-	BUILD_BUG_ON(sizeof(list->skb) != sizeof(list->link));
-	return (unsigned long)list->skb < PAGE_OFFSET;
-}
-
-/*
- * Access macros for acquiring freeing slots in tx_skbs[].
- */
-
-static void add_id_to_freelist(unsigned *head, union skb_entry *list,
-			       unsigned short id)
-{
-	skb_entry_set_link(&list[id], *head);
-	*head = id;
-}
-
-static unsigned short get_id_from_freelist(unsigned *head,
-					   union skb_entry *list)
-{
-	unsigned int id = *head;
-	*head = list[id].link;
-	return id;
-}
-
-static int xennet_rxidx(RING_IDX idx)
-{
-	return idx & (NET_RX_RING_SIZE - 1);
-}
-
-static struct sk_buff *xennet_get_rx_skb(struct netfront_info *np,
-					 RING_IDX ri)
-{
-	int i = xennet_rxidx(ri);
-	struct sk_buff *skb = np->rx_skbs[i];
-	np->rx_skbs[i] = NULL;
-	return skb;
-}
-
-static grant_ref_t xennet_get_rx_ref(struct netfront_info *np,
-					    RING_IDX ri)
-{
-	int i = xennet_rxidx(ri);
-	grant_ref_t ref = np->grant_rx_ref[i];
-	np->grant_rx_ref[i] = GRANT_INVALID_REF;
-	return ref;
-}
-
-#ifdef CONFIG_SYSFS
-static int xennet_sysfs_addif(struct net_device *netdev);
-static void xennet_sysfs_delif(struct net_device *netdev);
-#else /* !CONFIG_SYSFS */
-#define xennet_sysfs_addif(dev) (0)
-#define xennet_sysfs_delif(dev) do { } while (0)
-#endif
-
-static bool xennet_can_sg(struct net_device *dev)
-{
-	return dev->features & NETIF_F_SG;
-}
-
-
-static void rx_refill_timeout(unsigned long data)
-{
-	struct net_device *dev = (struct net_device *)data;
-	struct netfront_info *np = netdev_priv(dev);
-	napi_schedule(&np->napi);
-}
-
-static int netfront_tx_slot_available(struct netfront_info *np)
-{
-	return (np->tx.req_prod_pvt - np->tx.rsp_cons) <
-		(TX_MAX_TARGET - MAX_SKB_FRAGS - 2);
-}
-
-static void xennet_maybe_wake_tx(struct net_device *dev)
-{
-	struct netfront_info *np = netdev_priv(dev);
-
-	if (unlikely(netif_queue_stopped(dev)) &&
-	    netfront_tx_slot_available(np) &&
-	    likely(netif_running(dev)))
-		netif_wake_queue(dev);
-}
-
-static void xennet_alloc_rx_buffers(struct net_device *dev)
-{
-	unsigned short id;
-	struct netfront_info *np = netdev_priv(dev);
-	struct sk_buff *skb;
-	struct page *page;
-	int i, batch_target, notify;
-	RING_IDX req_prod = np->rx.req_prod_pvt;
-	grant_ref_t ref;
-	unsigned long pfn;
-	void *vaddr;
-	struct xen_netif_rx_request *req;
-
-	if (unlikely(!netif_carrier_ok(dev)))
-		return;
-
-	/*
-	 * Allocate skbuffs greedily, even though we batch updates to the
-	 * receive ring. This creates a less bursty demand on the memory
-	 * allocator, so should reduce the chance of failed allocation requests
-	 * both for ourself and for other kernel subsystems.
-	 */
-	batch_target = np->rx_target - (req_prod - np->rx.rsp_cons);
-	for (i = skb_queue_len(&np->rx_batch); i < batch_target; i++) {
-		skb = __netdev_alloc_skb(dev, RX_COPY_THRESHOLD + NET_IP_ALIGN,
-					 GFP_ATOMIC | __GFP_NOWARN);
-		if (unlikely(!skb))
-			goto no_skb;
-
-		/* Align ip header to a 16 bytes boundary */
-		skb_reserve(skb, NET_IP_ALIGN);
-
-		page = alloc_page(GFP_ATOMIC | __GFP_NOWARN);
-		if (!page) {
-			kfree_skb(skb);
-no_skb:
-			/* Any skbuffs queued for refill? Force them out. */
-			if (i != 0)
-				goto refill;
-			/* Could not allocate any skbuffs. Try again later. */
-			mod_timer(&np->rx_refill_timer,
-				  jiffies + (HZ/10));
-			break;
-		}
-
-		__skb_fill_page_desc(skb, 0, page, 0, 0);
-		skb_shinfo(skb)->nr_frags = 1;
-		__skb_queue_tail(&np->rx_batch, skb);
-	}
-
-	/* Is the batch large enough to be worthwhile? */
-	if (i < (np->rx_target/2)) {
-		if (req_prod > np->rx.sring->req_prod)
-			goto push;
-		return;
-	}
-
-	/* Adjust our fill target if we risked running out of buffers. */
-	if (((req_prod - np->rx.sring->rsp_prod) < (np->rx_target / 4)) &&
-	    ((np->rx_target *= 2) > np->rx_max_target))
-		np->rx_target = np->rx_max_target;
-
- refill:
-	for (i = 0; ; i++) {
-		skb = __skb_dequeue(&np->rx_batch);
-		if (skb == NULL)
-			break;
-
-		skb->dev = dev;
-
-		id = xennet_rxidx(req_prod + i);
-
-		BUG_ON(np->rx_skbs[id]);
-		np->rx_skbs[id] = skb;
-
-		ref = gnttab_claim_grant_reference(&np->gref_rx_head);
-		BUG_ON((signed short)ref < 0);
-		np->grant_rx_ref[id] = ref;
-
-		pfn = page_to_pfn(skb_frag_page(&skb_shinfo(skb)->frags[0]));
-		vaddr = page_address(skb_frag_page(&skb_shinfo(skb)->frags[0]));
-
-		req = RING_GET_REQUEST(&np->rx, req_prod + i);
-		gnttab_grant_foreign_access_ref(ref,
-						np->xbdev->otherend_id,
-						pfn_to_mfn(pfn),
-						0);
-
-		req->id = id;
-		req->gref = ref;
-	}
-
-	wmb();		/* barrier so backend seens requests */
-
-	/* Above is a suitable barrier to ensure backend will see requests. */
-	np->rx.req_prod_pvt = req_prod + i;
- push:
-	RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&np->rx, notify);
-	if (notify)
-		notify_remote_via_irq(np->netdev->irq);
-}
-
-static int xennet_open(struct net_device *dev)
-{
-	struct netfront_info *np = netdev_priv(dev);
-
-	napi_enable(&np->napi);
-
-	spin_lock_bh(&np->rx_lock);
-	if (netif_carrier_ok(dev)) {
-		xennet_alloc_rx_buffers(dev);
-		np->rx.sring->rsp_event = np->rx.rsp_cons + 1;
-		if (RING_HAS_UNCONSUMED_RESPONSES(&np->rx))
-			napi_schedule(&np->napi);
-	}
-	spin_unlock_bh(&np->rx_lock);
-
-	netif_start_queue(dev);
-
-	return 0;
-}
-
-static void xennet_tx_buf_gc(struct net_device *dev)
-{
-	RING_IDX cons, prod;
-	unsigned short id;
-	struct netfront_info *np = netdev_priv(dev);
-	struct sk_buff *skb;
-
-	BUG_ON(!netif_carrier_ok(dev));
-
-	do {
-		prod = np->tx.sring->rsp_prod;
-		rmb(); /* Ensure we see responses up to 'rp'. */
-
-		for (cons = np->tx.rsp_cons; cons != prod; cons++) {
-			struct xen_netif_tx_response *txrsp;
-
-			txrsp = RING_GET_RESPONSE(&np->tx, cons);
-			if (txrsp->status == XEN_NETIF_RSP_NULL)
-				continue;
-
-			id  = txrsp->id;
-			skb = np->tx_skbs[id].skb;
-			if (unlikely(gnttab_query_foreign_access(
-				np->grant_tx_ref[id]) != 0)) {
-				printk(KERN_ALERT "xennet_tx_buf_gc: warning "
-				       "-- grant still in use by backend "
-				       "domain.\n");
-				BUG();
-			}
-			gnttab_end_foreign_access_ref(
-				np->grant_tx_ref[id], GNTMAP_readonly);
-			gnttab_release_grant_reference(
-				&np->gref_tx_head, np->grant_tx_ref[id]);
-			np->grant_tx_ref[id] = GRANT_INVALID_REF;
-			add_id_to_freelist(&np->tx_skb_freelist, np->tx_skbs, id);
-			dev_kfree_skb_irq(skb);
-		}
-
-		np->tx.rsp_cons = prod;
-
-		/*
-		 * Set a new event, then check for race with update of tx_cons.
-		 * Note that it is essential to schedule a callback, no matter
-		 * how few buffers are pending. Even if there is space in the
-		 * transmit ring, higher layers may be blocked because too much
-		 * data is outstanding: in such cases notification from Xen is
-		 * likely to be the only kick that we'll get.
-		 */
-		np->tx.sring->rsp_event =
-			prod + ((np->tx.sring->req_prod - prod) >> 1) + 1;
-		mb();		/* update shared area */
-	} while ((cons == prod) && (prod != np->tx.sring->rsp_prod));
-
-	xennet_maybe_wake_tx(dev);
-}
-
-static void xennet_make_frags(struct sk_buff *skb, struct net_device *dev,
-			      struct xen_netif_tx_request *tx)
-{
-	struct netfront_info *np = netdev_priv(dev);
-	char *data = skb->data;
-	unsigned long mfn;
-	RING_IDX prod = np->tx.req_prod_pvt;
-	int frags = skb_shinfo(skb)->nr_frags;
-	unsigned int offset = offset_in_page(data);
-	unsigned int len = skb_headlen(skb);
-	unsigned int id;
-	grant_ref_t ref;
-	int i;
-
-	/* While the header overlaps a page boundary (including being
-	   larger than a page), split it it into page-sized chunks. */
-	while (len > PAGE_SIZE - offset) {
-		tx->size = PAGE_SIZE - offset;
-		tx->flags |= XEN_NETTXF_more_data;
-		len -= tx->size;
-		data += tx->size;
-		offset = 0;
-
-		id = get_id_from_freelist(&np->tx_skb_freelist, np->tx_skbs);
-		np->tx_skbs[id].skb = skb_get(skb);
-		tx = RING_GET_REQUEST(&np->tx, prod++);
-		tx->id = id;
-		ref = gnttab_claim_grant_reference(&np->gref_tx_head);
-		BUG_ON((signed short)ref < 0);
-
-		mfn = virt_to_mfn(data);
-		gnttab_grant_foreign_access_ref(ref, np->xbdev->otherend_id,
-						mfn, GNTMAP_readonly);
-
-		tx->gref = np->grant_tx_ref[id] = ref;
-		tx->offset = offset;
-		tx->size = len;
-		tx->flags = 0;
-	}
-
-	/* Grant backend access to each skb fragment page. */
-	for (i = 0; i < frags; i++) {
-		skb_frag_t *frag = skb_shinfo(skb)->frags + i;
-
-		tx->flags |= XEN_NETTXF_more_data;
-
-		id = get_id_from_freelist(&np->tx_skb_freelist, np->tx_skbs);
-		np->tx_skbs[id].skb = skb_get(skb);
-		tx = RING_GET_REQUEST(&np->tx, prod++);
-		tx->id = id;
-		ref = gnttab_claim_grant_reference(&np->gref_tx_head);
-		BUG_ON((signed short)ref < 0);
-
-		mfn = pfn_to_mfn(page_to_pfn(skb_frag_page(frag)));
-		gnttab_grant_foreign_access_ref(ref, np->xbdev->otherend_id,
-						mfn, GNTMAP_readonly);
-
-		tx->gref = np->grant_tx_ref[id] = ref;
-		tx->offset = frag->page_offset;
-		tx->size = skb_frag_size(frag);
-		tx->flags = 0;
-	}
-
-	np->tx.req_prod_pvt = prod;
-}
-
-static int xennet_start_xmit(struct sk_buff *skb, struct net_device *dev)
-{
-	unsigned short id;
-	struct netfront_info *np = netdev_priv(dev);
-	struct netfront_stats *stats = this_cpu_ptr(np->stats);
-	struct xen_netif_tx_request *tx;
-	struct xen_netif_extra_info *extra;
-	char *data = skb->data;
-	RING_IDX i;
-	grant_ref_t ref;
-	unsigned long mfn;
-	int notify;
-	int frags = skb_shinfo(skb)->nr_frags;
-	unsigned int offset = offset_in_page(data);
-	unsigned int len = skb_headlen(skb);
-	unsigned long flags;
-
-	frags += DIV_ROUND_UP(offset + len, PAGE_SIZE);
-	if (unlikely(frags > MAX_SKB_FRAGS + 1)) {
-		printk(KERN_ALERT "xennet: skb rides the rocket: %d frags\n",
-		       frags);
-		dump_stack();
-		goto drop;
-	}
-
-	spin_lock_irqsave(&np->tx_lock, flags);
-
-	if (unlikely(!netif_carrier_ok(dev) ||
-		     (frags > 1 && !xennet_can_sg(dev)) ||
-		     netif_needs_gso(skb, netif_skb_features(skb)))) {
-		spin_unlock_irqrestore(&np->tx_lock, flags);
-		goto drop;
-	}
-
-	i = np->tx.req_prod_pvt;
-
-	id = get_id_from_freelist(&np->tx_skb_freelist, np->tx_skbs);
-	np->tx_skbs[id].skb = skb;
-
-	tx = RING_GET_REQUEST(&np->tx, i);
-
-	tx->id   = id;
-	ref = gnttab_claim_grant_reference(&np->gref_tx_head);
-	BUG_ON((signed short)ref < 0);
-	mfn = virt_to_mfn(data);
-	gnttab_grant_foreign_access_ref(
-		ref, np->xbdev->otherend_id, mfn, GNTMAP_readonly);
-	tx->gref = np->grant_tx_ref[id] = ref;
-	tx->offset = offset;
-	tx->size = len;
-	extra = NULL;
-
-	tx->flags = 0;
-	if (skb->ip_summed == CHECKSUM_PARTIAL)
-		/* local packet? */
-		tx->flags |= XEN_NETTXF_csum_blank | XEN_NETTXF_data_validated;
-	else if (skb->ip_summed == CHECKSUM_UNNECESSARY)
-		/* remote but checksummed. */
-		tx->flags |= XEN_NETTXF_data_validated;
-
-	if (skb_shinfo(skb)->gso_size) {
-		struct xen_netif_extra_info *gso;
-
-		gso = (struct xen_netif_extra_info *)
-			RING_GET_REQUEST(&np->tx, ++i);
-
-		if (extra)
-			extra->flags |= XEN_NETIF_EXTRA_FLAG_MORE;
-		else
-			tx->flags |= XEN_NETTXF_extra_info;
-
-		gso->u.gso.size = skb_shinfo(skb)->gso_size;
-		gso->u.gso.type = XEN_NETIF_GSO_TYPE_TCPV4;
-		gso->u.gso.pad = 0;
-		gso->u.gso.features = 0;
-
-		gso->type = XEN_NETIF_EXTRA_TYPE_GSO;
-		gso->flags = 0;
-		extra = gso;
-	}
-
-	np->tx.req_prod_pvt = i + 1;
-
-	xennet_make_frags(skb, dev, tx);
-	tx->size = skb->len;
-
-	RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&np->tx, notify);
-	if (notify)
-		notify_remote_via_irq(np->netdev->irq);
-
-	u64_stats_update_begin(&stats->syncp);
-	stats->tx_bytes += skb->len;
-	stats->tx_packets++;
-	u64_stats_update_end(&stats->syncp);
-
-	/* Note: It is not safe to access skb after xennet_tx_buf_gc()! */
-	xennet_tx_buf_gc(dev);
-
-	if (!netfront_tx_slot_available(np))
-		netif_stop_queue(dev);
-
-	spin_unlock_irqrestore(&np->tx_lock, flags);
-
-	return NETDEV_TX_OK;
-
- drop:
-	dev->stats.tx_dropped++;
-	dev_kfree_skb(skb);
-	return NETDEV_TX_OK;
-}
-
-static int xennet_close(struct net_device *dev)
-{
-	struct netfront_info *np = netdev_priv(dev);
-	netif_stop_queue(np->netdev);
-	napi_disable(&np->napi);
-	return 0;
-}
-
-static void xennet_move_rx_slot(struct netfront_info *np, struct sk_buff *skb,
-				grant_ref_t ref)
-{
-	int new = xennet_rxidx(np->rx.req_prod_pvt);
-
-	BUG_ON(np->rx_skbs[new]);
-	np->rx_skbs[new] = skb;
-	np->grant_rx_ref[new] = ref;
-	RING_GET_REQUEST(&np->rx, np->rx.req_prod_pvt)->id = new;
-	RING_GET_REQUEST(&np->rx, np->rx.req_prod_pvt)->gref = ref;
-	np->rx.req_prod_pvt++;
-}
-
-static int xennet_get_extras(struct netfront_info *np,
-			     struct xen_netif_extra_info *extras,
-			     RING_IDX rp)
-
-{
-	struct xen_netif_extra_info *extra;
-	struct device *dev = &np->netdev->dev;
-	RING_IDX cons = np->rx.rsp_cons;
-	int err = 0;
-
-	do {
-		struct sk_buff *skb;
-		grant_ref_t ref;
-
-		if (unlikely(cons + 1 == rp)) {
-			if (net_ratelimit())
-				dev_warn(dev, "Missing extra info\n");
-			err = -EBADR;
-			break;
-		}
-
-		extra = (struct xen_netif_extra_info *)
-			RING_GET_RESPONSE(&np->rx, ++cons);
-
-		if (unlikely(!extra->type ||
-			     extra->type >= XEN_NETIF_EXTRA_TYPE_MAX)) {
-			if (net_ratelimit())
-				dev_warn(dev, "Invalid extra type: %d\n",
-					extra->type);
-			err = -EINVAL;
-		} else {
-			memcpy(&extras[extra->type - 1], extra,
-			       sizeof(*extra));
-		}
-
-		skb = xennet_get_rx_skb(np, cons);
-		ref = xennet_get_rx_ref(np, cons);
-		xennet_move_rx_slot(np, skb, ref);
-	} while (extra->flags & XEN_NETIF_EXTRA_FLAG_MORE);
-
-	np->rx.rsp_cons = cons;
-	return err;
-}
-
-static int xennet_get_responses(struct netfront_info *np,
-				struct netfront_rx_info *rinfo, RING_IDX rp,
-				struct sk_buff_head *list)
-{
-	struct xen_netif_rx_response *rx = &rinfo->rx;
-	struct xen_netif_extra_info *extras = rinfo->extras;
-	struct device *dev = &np->netdev->dev;
-	RING_IDX cons = np->rx.rsp_cons;
-	struct sk_buff *skb = xennet_get_rx_skb(np, cons);
-	grant_ref_t ref = xennet_get_rx_ref(np, cons);
-	int max = MAX_SKB_FRAGS + (rx->status <= RX_COPY_THRESHOLD);
-	int frags = 1;
-	int err = 0;
-	unsigned long ret;
-
-	if (rx->flags & XEN_NETRXF_extra_info) {
-		err = xennet_get_extras(np, extras, rp);
-		cons = np->rx.rsp_cons;
-	}
-
-	for (;;) {
-		if (unlikely(rx->status < 0 ||
-			     rx->offset + rx->status > PAGE_SIZE)) {
-			if (net_ratelimit())
-				dev_warn(dev, "rx->offset: %x, size: %u\n",
-					 rx->offset, rx->status);
-			xennet_move_rx_slot(np, skb, ref);
-			err = -EINVAL;
-			goto next;
-		}
-
-		/*
-		 * This definitely indicates a bug, either in this driver or in
-		 * the backend driver. In future this should flag the bad
-		 * situation to the system controller to reboot the backed.
-		 */
-		if (ref == GRANT_INVALID_REF) {
-			if (net_ratelimit())
-				dev_warn(dev, "Bad rx response id %d.\n",
-					 rx->id);
-			err = -EINVAL;
-			goto next;
-		}
-
-		ret = gnttab_end_foreign_access_ref(ref, 0);
-		BUG_ON(!ret);
-
-		gnttab_release_grant_reference(&np->gref_rx_head, ref);
-
-		__skb_queue_tail(list, skb);
-
-next:
-		if (!(rx->flags & XEN_NETRXF_more_data))
-			break;
-
-		if (cons + frags == rp) {
-			if (net_ratelimit())
-				dev_warn(dev, "Need more frags\n");
-			err = -ENOENT;
-			break;
-		}
-
-		rx = RING_GET_RESPONSE(&np->rx, cons + frags);
-		skb = xennet_get_rx_skb(np, cons + frags);
-		ref = xennet_get_rx_ref(np, cons + frags);
-		frags++;
-	}
-
-	if (unlikely(frags > max)) {
-		if (net_ratelimit())
-			dev_warn(dev, "Too many frags\n");
-		err = -E2BIG;
-	}
-
-	if (unlikely(err))
-		np->rx.rsp_cons = cons + frags;
-
-	return err;
-}
-
-static int xennet_set_skb_gso(struct sk_buff *skb,
-			      struct xen_netif_extra_info *gso)
-{
-	if (!gso->u.gso.size) {
-		if (net_ratelimit())
-			printk(KERN_WARNING "GSO size must not be zero.\n");
-		return -EINVAL;
-	}
-
-	/* Currently only TCPv4 S.O. is supported. */
-	if (gso->u.gso.type != XEN_NETIF_GSO_TYPE_TCPV4) {
-		if (net_ratelimit())
-			printk(KERN_WARNING "Bad GSO type %d.\n", gso->u.gso.type);
-		return -EINVAL;
-	}
-
-	skb_shinfo(skb)->gso_size = gso->u.gso.size;
-	skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4;
-
-	/* Header must be checked, and gso_segs computed. */
-	skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY;
-	skb_shinfo(skb)->gso_segs = 0;
-
-	return 0;
-}
-
-static RING_IDX xennet_fill_frags(struct netfront_info *np,
-				  struct sk_buff *skb,
-				  struct sk_buff_head *list)
-{
-	struct skb_shared_info *shinfo = skb_shinfo(skb);
-	int nr_frags = shinfo->nr_frags;
-	RING_IDX cons = np->rx.rsp_cons;
-	struct sk_buff *nskb;
-
-	while ((nskb = __skb_dequeue(list))) {
-		struct xen_netif_rx_response *rx =
-			RING_GET_RESPONSE(&np->rx, ++cons);
-		skb_frag_t *nfrag = &skb_shinfo(nskb)->frags[0];
-
-		__skb_fill_page_desc(skb, nr_frags,
-				     skb_frag_page(nfrag),
-				     rx->offset, rx->status);
-
-		skb->data_len += rx->status;
-
-		skb_shinfo(nskb)->nr_frags = 0;
-		kfree_skb(nskb);
-
-		nr_frags++;
-	}
-
-	shinfo->nr_frags = nr_frags;
-	return cons;
-}
-
-static int checksum_setup(struct net_device *dev, struct sk_buff *skb)
-{
-	struct iphdr *iph;
-	unsigned char *th;
-	int err = -EPROTO;
-	int recalculate_partial_csum = 0;
-
-	/*
-	 * A GSO SKB must be CHECKSUM_PARTIAL. However some buggy
-	 * peers can fail to set NETRXF_csum_blank when sending a GSO
-	 * frame. In this case force the SKB to CHECKSUM_PARTIAL and
-	 * recalculate the partial checksum.
-	 */
-	if (skb->ip_summed != CHECKSUM_PARTIAL && skb_is_gso(skb)) {
-		struct netfront_info *np = netdev_priv(dev);
-		np->rx_gso_checksum_fixup++;
-		skb->ip_summed = CHECKSUM_PARTIAL;
-		recalculate_partial_csum = 1;
-	}
-
-	/* A non-CHECKSUM_PARTIAL SKB does not require setup. */
-	if (skb->ip_summed != CHECKSUM_PARTIAL)
-		return 0;
-
-	if (skb->protocol != htons(ETH_P_IP))
-		goto out;
-
-	iph = (void *)skb->data;
-	th = skb->data + 4 * iph->ihl;
-	if (th >= skb_tail_pointer(skb))
-		goto out;
-
-	skb->csum_start = th - skb->head;
-	switch (iph->protocol) {
-	case IPPROTO_TCP:
-		skb->csum_offset = offsetof(struct tcphdr, check);
-
-		if (recalculate_partial_csum) {
-			struct tcphdr *tcph = (struct tcphdr *)th;
-			tcph->check = ~csum_tcpudp_magic(iph->saddr, iph->daddr,
-							 skb->len - iph->ihl*4,
-							 IPPROTO_TCP, 0);
-		}
-		break;
-	case IPPROTO_UDP:
-		skb->csum_offset = offsetof(struct udphdr, check);
-
-		if (recalculate_partial_csum) {
-			struct udphdr *udph = (struct udphdr *)th;
-			udph->check = ~csum_tcpudp_magic(iph->saddr, iph->daddr,
-							 skb->len - iph->ihl*4,
-							 IPPROTO_UDP, 0);
-		}
-		break;
-	default:
-		if (net_ratelimit())
-			printk(KERN_ERR "Attempting to checksum a non-"
-			       "TCP/UDP packet, dropping a protocol"
-			       " %d packet", iph->protocol);
-		goto out;
-	}
-
-	if ((th + skb->csum_offset + 2) > skb_tail_pointer(skb))
-		goto out;
-
-	err = 0;
-
-out:
-	return err;
-}
-
-static int handle_incoming_queue(struct net_device *dev,
-				 struct sk_buff_head *rxq)
-{
-	struct netfront_info *np = netdev_priv(dev);
-	struct netfront_stats *stats = this_cpu_ptr(np->stats);
-	int packets_dropped = 0;
-	struct sk_buff *skb;
-
-	while ((skb = __skb_dequeue(rxq)) != NULL) {
-		struct page *page = NETFRONT_SKB_CB(skb)->page;
-		void *vaddr = page_address(page);
-		unsigned offset = NETFRONT_SKB_CB(skb)->offset;
-
-		memcpy(skb->data, vaddr + offset,
-		       skb_headlen(skb));
-
-		if (page != skb_frag_page(&skb_shinfo(skb)->frags[0]))
-			__free_page(page);
-
-		/* Ethernet work: Delayed to here as it peeks the header. */
-		skb->protocol = eth_type_trans(skb, dev);
-
-		if (checksum_setup(dev, skb)) {
-			kfree_skb(skb);
-			packets_dropped++;
-			dev->stats.rx_errors++;
-			continue;
-		}
-
-		u64_stats_update_begin(&stats->syncp);
-		stats->rx_packets++;
-		stats->rx_bytes += skb->len;
-		u64_stats_update_end(&stats->syncp);
-
-		/* Pass it up. */
-		netif_receive_skb(skb);
-	}
-
-	return packets_dropped;
-}
-
-static int xennet_poll(struct napi_struct *napi, int budget)
-{
-	struct netfront_info *np = container_of(napi, struct netfront_info, napi);
-	struct net_device *dev = np->netdev;
-	struct sk_buff *skb;
-	struct netfront_rx_info rinfo;
-	struct xen_netif_rx_response *rx = &rinfo.rx;
-	struct xen_netif_extra_info *extras = rinfo.extras;
-	RING_IDX i, rp;
-	int work_done;
-	struct sk_buff_head rxq;
-	struct sk_buff_head errq;
-	struct sk_buff_head tmpq;
-	unsigned long flags;
-	unsigned int len;
-	int err;
-
-	spin_lock(&np->rx_lock);
-
-	skb_queue_head_init(&rxq);
-	skb_queue_head_init(&errq);
-	skb_queue_head_init(&tmpq);
-
-	rp = np->rx.sring->rsp_prod;
-	rmb(); /* Ensure we see queued responses up to 'rp'. */
-
-	i = np->rx.rsp_cons;
-	work_done = 0;
-	while ((i != rp) && (work_done < budget)) {
-		memcpy(rx, RING_GET_RESPONSE(&np->rx, i), sizeof(*rx));
-		memset(extras, 0, sizeof(rinfo.extras));
-
-		err = xennet_get_responses(np, &rinfo, rp, &tmpq);
-
-		if (unlikely(err)) {
-err:
-			while ((skb = __skb_dequeue(&tmpq)))
-				__skb_queue_tail(&errq, skb);
-			dev->stats.rx_errors++;
-			i = np->rx.rsp_cons;
-			continue;
-		}
-
-		skb = __skb_dequeue(&tmpq);
-
-		if (extras[XEN_NETIF_EXTRA_TYPE_GSO - 1].type) {
-			struct xen_netif_extra_info *gso;
-			gso = &extras[XEN_NETIF_EXTRA_TYPE_GSO - 1];
-
-			if (unlikely(xennet_set_skb_gso(skb, gso))) {
-				__skb_queue_head(&tmpq, skb);
-				np->rx.rsp_cons += skb_queue_len(&tmpq);
-				goto err;
-			}
-		}
-
-		NETFRONT_SKB_CB(skb)->page =
-			skb_frag_page(&skb_shinfo(skb)->frags[0]);
-		NETFRONT_SKB_CB(skb)->offset = rx->offset;
-
-		len = rx->status;
-		if (len > RX_COPY_THRESHOLD)
-			len = RX_COPY_THRESHOLD;
-		skb_put(skb, len);
-
-		if (rx->status > len) {
-			skb_shinfo(skb)->frags[0].page_offset =
-				rx->offset + len;
-			skb_frag_size_set(&skb_shinfo(skb)->frags[0], rx->status - len);
-			skb->data_len = rx->status - len;
-		} else {
-			__skb_fill_page_desc(skb, 0, NULL, 0, 0);
-			skb_shinfo(skb)->nr_frags = 0;
-		}
-
-		i = xennet_fill_frags(np, skb, &tmpq);
-
-		/*
-		 * Truesize approximates the size of true data plus
-		 * any supervisor overheads. Adding hypervisor
-		 * overheads has been shown to significantly reduce
-		 * achievable bandwidth with the default receive
-		 * buffer size. It is therefore not wise to account
-		 * for it here.
-		 *
-		 * After alloc_skb(RX_COPY_THRESHOLD), truesize is set
-		 * to RX_COPY_THRESHOLD + the supervisor
-		 * overheads. Here, we add the size of the data pulled
-		 * in xennet_fill_frags().
-		 *
-		 * We also adjust for any unused space in the main
-		 * data area by subtracting (RX_COPY_THRESHOLD -
-		 * len). This is especially important with drivers
-		 * which split incoming packets into header and data,
-		 * using only 66 bytes of the main data area (see the
-		 * e1000 driver for example.)  On such systems,
-		 * without this last adjustement, our achievable
-		 * receive throughout using the standard receive
-		 * buffer size was cut by 25%(!!!).
-		 */
-		skb->truesize += skb->data_len - (RX_COPY_THRESHOLD - len);
-		skb->len += skb->data_len;
-
-		if (rx->flags & XEN_NETRXF_csum_blank)
-			skb->ip_summed = CHECKSUM_PARTIAL;
-		else if (rx->flags & XEN_NETRXF_data_validated)
-			skb->ip_summed = CHECKSUM_UNNECESSARY;
-
-		__skb_queue_tail(&rxq, skb);
-
-		np->rx.rsp_cons = ++i;
-		work_done++;
-	}
-
-	__skb_queue_purge(&errq);
-
-	work_done -= handle_incoming_queue(dev, &rxq);
-
-	/* If we get a callback with very few responses, reduce fill target. */
-	/* NB. Note exponential increase, linear decrease. */
-	if (((np->rx.req_prod_pvt - np->rx.sring->rsp_prod) >
-	     ((3*np->rx_target) / 4)) &&
-	    (--np->rx_target < np->rx_min_target))
-		np->rx_target = np->rx_min_target;
-
-	xennet_alloc_rx_buffers(dev);
-
-	if (work_done < budget) {
-		int more_to_do = 0;
-
-		local_irq_save(flags);
-
-		RING_FINAL_CHECK_FOR_RESPONSES(&np->rx, more_to_do);
-		if (!more_to_do)
-			__napi_complete(napi);
-
-		local_irq_restore(flags);
-	}
-
-	spin_unlock(&np->rx_lock);
-
-	return work_done;
-}
-
-static int xennet_change_mtu(struct net_device *dev, int mtu)
-{
-	int max = xennet_can_sg(dev) ? 65535 - ETH_HLEN : ETH_DATA_LEN;
-
-	if (mtu > max)
-		return -EINVAL;
-	dev->mtu = mtu;
-	return 0;
-}
-
-static struct rtnl_link_stats64 *xennet_get_stats64(struct net_device *dev,
-						    struct rtnl_link_stats64 *tot)
-{
-	struct netfront_info *np = netdev_priv(dev);
-	int cpu;
-
-	for_each_possible_cpu(cpu) {
-		struct netfront_stats *stats = per_cpu_ptr(np->stats, cpu);
-		u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
-		unsigned int start;
-
-		do {
-			start = u64_stats_fetch_begin_bh(&stats->syncp);
-
-			rx_packets = stats->rx_packets;
-			tx_packets = stats->tx_packets;
-			rx_bytes = stats->rx_bytes;
-			tx_bytes = stats->tx_bytes;
-		} while (u64_stats_fetch_retry_bh(&stats->syncp, start));
-
-		tot->rx_packets += rx_packets;
-		tot->tx_packets += tx_packets;
-		tot->rx_bytes   += rx_bytes;
-		tot->tx_bytes   += tx_bytes;
-	}
-
-	tot->rx_errors  = dev->stats.rx_errors;
-	tot->tx_dropped = dev->stats.tx_dropped;
-
-	return tot;
-}
-
-static void xennet_release_tx_bufs(struct netfront_info *np)
-{
-	struct sk_buff *skb;
-	int i;
-
-	for (i = 0; i < NET_TX_RING_SIZE; i++) {
-		/* Skip over entries which are actually freelist references */
-		if (skb_entry_is_link(&np->tx_skbs[i]))
-			continue;
-
-		skb = np->tx_skbs[i].skb;
-		gnttab_end_foreign_access_ref(np->grant_tx_ref[i],
-					      GNTMAP_readonly);
-		gnttab_release_grant_reference(&np->gref_tx_head,
-					       np->grant_tx_ref[i]);
-		np->grant_tx_ref[i] = GRANT_INVALID_REF;
-		add_id_to_freelist(&np->tx_skb_freelist, np->tx_skbs, i);
-		dev_kfree_skb_irq(skb);
-	}
-}
-
-static void xennet_release_rx_bufs(struct netfront_info *np)
-{
-	struct mmu_update      *mmu = np->rx_mmu;
-	struct multicall_entry *mcl = np->rx_mcl;
-	struct sk_buff_head free_list;
-	struct sk_buff *skb;
-	unsigned long mfn;
-	int xfer = 0, noxfer = 0, unused = 0;
-	int id, ref;
-
-	dev_warn(&np->netdev->dev, "%s: fix me for copying receiver.\n",
-			 __func__);
-	return;
-
-	skb_queue_head_init(&free_list);
-
-	spin_lock_bh(&np->rx_lock);
-
-	for (id = 0; id < NET_RX_RING_SIZE; id++) {
-		ref = np->grant_rx_ref[id];
-		if (ref == GRANT_INVALID_REF) {
-			unused++;
-			continue;
-		}
-
-		skb = np->rx_skbs[id];
-		mfn = gnttab_end_foreign_transfer_ref(ref);
-		gnttab_release_grant_reference(&np->gref_rx_head, ref);
-		np->grant_rx_ref[id] = GRANT_INVALID_REF;
-
-		if (0 == mfn) {
-			skb_shinfo(skb)->nr_frags = 0;
-			dev_kfree_skb(skb);
-			noxfer++;
-			continue;
-		}
-
-		if (!xen_feature(XENFEAT_auto_translated_physmap)) {
-			/* Remap the page. */
-			const struct page *page =
-				skb_frag_page(&skb_shinfo(skb)->frags[0]);
-			unsigned long pfn = page_to_pfn(page);
-			void *vaddr = page_address(page);
-
-			MULTI_update_va_mapping(mcl, (unsigned long)vaddr,
-						mfn_pte(mfn, PAGE_KERNEL),
-						0);
-			mcl++;
-			mmu->ptr = ((u64)mfn << PAGE_SHIFT)
-				| MMU_MACHPHYS_UPDATE;
-			mmu->val = pfn;
-			mmu++;
-
-			set_phys_to_machine(pfn, mfn);
-		}
-		__skb_queue_tail(&free_list, skb);
-		xfer++;
-	}
-
-	dev_info(&np->netdev->dev, "%s: %d xfer, %d noxfer, %d unused\n",
-		 __func__, xfer, noxfer, unused);
-
-	if (xfer) {
-		if (!xen_feature(XENFEAT_auto_translated_physmap)) {
-			/* Do all the remapping work and M2P updates. */
-			MULTI_mmu_update(mcl, np->rx_mmu, mmu - np->rx_mmu,
-					 NULL, DOMID_SELF);
-			mcl++;
-			HYPERVISOR_multicall(np->rx_mcl, mcl - np->rx_mcl);
-		}
-	}
-
-	__skb_queue_purge(&free_list);
-
-	spin_unlock_bh(&np->rx_lock);
-}
-
-static void xennet_uninit(struct net_device *dev)
-{
-	struct netfront_info *np = netdev_priv(dev);
-	xennet_release_tx_bufs(np);
-	xennet_release_rx_bufs(np);
-	gnttab_free_grant_references(np->gref_tx_head);
-	gnttab_free_grant_references(np->gref_rx_head);
-}
-
-static netdev_features_t xennet_fix_features(struct net_device *dev,
-	netdev_features_t features)
-{
-	struct netfront_info *np = netdev_priv(dev);
-	int val;
-
-	if (features & NETIF_F_SG) {
-		if (xenbus_scanf(XBT_NIL, np->xbdev->otherend, "feature-sg",
-				 "%d", &val) < 0)
-			val = 0;
-
-		if (!val)
-			features &= ~NETIF_F_SG;
-	}
-
-	if (features & NETIF_F_TSO) {
-		if (xenbus_scanf(XBT_NIL, np->xbdev->otherend,
-				 "feature-gso-tcpv4", "%d", &val) < 0)
-			val = 0;
-
-		if (!val)
-			features &= ~NETIF_F_TSO;
-	}
-
-	return features;
-}
-
-static int xennet_set_features(struct net_device *dev,
-	netdev_features_t features)
-{
-	if (!(features & NETIF_F_SG) && dev->mtu > ETH_DATA_LEN) {
-		netdev_info(dev, "Reducing MTU because no SG offload");
-		dev->mtu = ETH_DATA_LEN;
-	}
-
-	return 0;
-}
-
-static irqreturn_t xennet_interrupt(int irq, void *dev_id)
-{
-	struct net_device *dev = dev_id;
-	struct netfront_info *np = netdev_priv(dev);
-	unsigned long flags;
-
-	spin_lock_irqsave(&np->tx_lock, flags);
-
-	if (likely(netif_carrier_ok(dev))) {
-		xennet_tx_buf_gc(dev);
-		/* Under tx_lock: protects access to rx shared-ring indexes. */
-		if (RING_HAS_UNCONSUMED_RESPONSES(&np->rx))
-			napi_schedule(&np->napi);
-	}
-
-	spin_unlock_irqrestore(&np->tx_lock, flags);
-
-	return IRQ_HANDLED;
-}
-
-#ifdef CONFIG_NET_POLL_CONTROLLER
-static void xennet_poll_controller(struct net_device *dev)
-{
-	xennet_interrupt(0, dev);
-}
-#endif
-
-static const struct net_device_ops xennet_netdev_ops = {
-	.ndo_open            = xennet_open,
-	.ndo_uninit          = xennet_uninit,
-	.ndo_stop            = xennet_close,
-	.ndo_start_xmit      = xennet_start_xmit,
-	.ndo_change_mtu	     = xennet_change_mtu,
-	.ndo_get_stats64     = xennet_get_stats64,
-	.ndo_set_mac_address = eth_mac_addr,
-	.ndo_validate_addr   = eth_validate_addr,
-	.ndo_fix_features    = xennet_fix_features,
-	.ndo_set_features    = xennet_set_features,
-#ifdef CONFIG_NET_POLL_CONTROLLER
-	.ndo_poll_controller = xennet_poll_controller,
-#endif
-};
-
-static struct net_device * __devinit xennet_create_dev(struct xenbus_device *dev)
-{
-	int i, err;
-	struct net_device *netdev;
-	struct netfront_info *np;
-
-	netdev = alloc_etherdev(sizeof(struct netfront_info));
-	if (!netdev)
-		return ERR_PTR(-ENOMEM);
-
-	np                   = netdev_priv(netdev);
-	np->xbdev            = dev;
-
-	spin_lock_init(&np->tx_lock);
-	spin_lock_init(&np->rx_lock);
-
-	skb_queue_head_init(&np->rx_batch);
-	np->rx_target     = RX_DFL_MIN_TARGET;
-	np->rx_min_target = RX_DFL_MIN_TARGET;
-	np->rx_max_target = RX_MAX_TARGET;
-
-	init_timer(&np->rx_refill_timer);
-	np->rx_refill_timer.data = (unsigned long)netdev;
-	np->rx_refill_timer.function = rx_refill_timeout;
-
-	err = -ENOMEM;
-	np->stats = alloc_percpu(struct netfront_stats);
-	if (np->stats == NULL)
-		goto exit;
-
-	/* Initialise tx_skbs as a free chain containing every entry. */
-	np->tx_skb_freelist = 0;
-	for (i = 0; i < NET_TX_RING_SIZE; i++) {
-		skb_entry_set_link(&np->tx_skbs[i], i+1);
-		np->grant_tx_ref[i] = GRANT_INVALID_REF;
-	}
-
-	/* Clear out rx_skbs */
-	for (i = 0; i < NET_RX_RING_SIZE; i++) {
-		np->rx_skbs[i] = NULL;
-		np->grant_rx_ref[i] = GRANT_INVALID_REF;
-	}
-
-	/* A grant for every tx ring slot */
-	if (gnttab_alloc_grant_references(TX_MAX_TARGET,
-					  &np->gref_tx_head) < 0) {
-		printk(KERN_ALERT "#### netfront can't alloc tx grant refs\n");
-		err = -ENOMEM;
-		goto exit_free_stats;
-	}
-	/* A grant for every rx ring slot */
-	if (gnttab_alloc_grant_references(RX_MAX_TARGET,
-					  &np->gref_rx_head) < 0) {
-		printk(KERN_ALERT "#### netfront can't alloc rx grant refs\n");
-		err = -ENOMEM;
-		goto exit_free_tx;
-	}
-
-	netdev->netdev_ops	= &xennet_netdev_ops;
-
-	netif_napi_add(netdev, &np->napi, xennet_poll, 64);
-	netdev->features        = NETIF_F_IP_CSUM | NETIF_F_RXCSUM |
-				  NETIF_F_GSO_ROBUST;
-	netdev->hw_features	= NETIF_F_IP_CSUM | NETIF_F_SG | NETIF_F_TSO;
-
-	/*
-         * Assume that all hw features are available for now. This set
-         * will be adjusted by the call to netdev_update_features() in
-         * xennet_connect() which is the earliest point where we can
-         * negotiate with the backend regarding supported features.
-         */
-	netdev->features |= netdev->hw_features;
-
-	SET_ETHTOOL_OPS(netdev, &xennet_ethtool_ops);
-	SET_NETDEV_DEV(netdev, &dev->dev);
-
-	np->netdev = netdev;
-
-	netif_carrier_off(netdev);
-
-	return netdev;
-
- exit_free_tx:
-	gnttab_free_grant_references(np->gref_tx_head);
- exit_free_stats:
-	free_percpu(np->stats);
- exit:
-	free_netdev(netdev);
-	return ERR_PTR(err);
-}
-
-/**
- * Entry point to this code when a new device is created.  Allocate the basic
- * structures and the ring buffers for communication with the backend, and
- * inform the backend of the appropriate details for those.
- */
-static int __devinit netfront_probe(struct xenbus_device *dev,
-				    const struct xenbus_device_id *id)
-{
-	int err;
-	struct net_device *netdev;
-	struct netfront_info *info;
-
-	netdev = xennet_create_dev(dev);
-	if (IS_ERR(netdev)) {
-		err = PTR_ERR(netdev);
-		xenbus_dev_fatal(dev, err, "creating netdev");
-		return err;
-	}
-
-	info = netdev_priv(netdev);
-	dev_set_drvdata(&dev->dev, info);
-
-	err = register_netdev(info->netdev);
-	if (err) {
-		printk(KERN_WARNING "%s: register_netdev err=%d\n",
-		       __func__, err);
-		goto fail;
-	}
-
-	err = xennet_sysfs_addif(info->netdev);
-	if (err) {
-		unregister_netdev(info->netdev);
-		printk(KERN_WARNING "%s: add sysfs failed err=%d\n",
-		       __func__, err);
-		goto fail;
-	}
-
-	return 0;
-
- fail:
-	free_netdev(netdev);
-	dev_set_drvdata(&dev->dev, NULL);
-	return err;
-}
-
-static void xennet_end_access(int ref, void *page)
-{
-	/* This frees the page as a side-effect */
-	if (ref != GRANT_INVALID_REF)
-		gnttab_end_foreign_access(ref, 0, (unsigned long)page);
-}
-
-static void xennet_disconnect_backend(struct netfront_info *info)
-{
-	/* Stop old i/f to prevent errors whilst we rebuild the state. */
-	spin_lock_bh(&info->rx_lock);
-	spin_lock_irq(&info->tx_lock);
-	netif_carrier_off(info->netdev);
-	spin_unlock_irq(&info->tx_lock);
-	spin_unlock_bh(&info->rx_lock);
-
-	if (info->netdev->irq)
-		unbind_from_irqhandler(info->netdev->irq, info->netdev);
-	info->evtchn = info->netdev->irq = 0;
-
-	/* End access and free the pages */
-	xennet_end_access(info->tx_ring_ref, info->tx.sring);
-	xennet_end_access(info->rx_ring_ref, info->rx.sring);
-
-	info->tx_ring_ref = GRANT_INVALID_REF;
-	info->rx_ring_ref = GRANT_INVALID_REF;
-	info->tx.sring = NULL;
-	info->rx.sring = NULL;
-}
-
-/**
- * We are reconnecting to the backend, due to a suspend/resume, or a backend
- * driver restart.  We tear down our netif structure and recreate it, but
- * leave the device-layer structures intact so that this is transparent to the
- * rest of the kernel.
- */
-static int netfront_resume(struct xenbus_device *dev)
-{
-	struct netfront_info *info = dev_get_drvdata(&dev->dev);
-
-	dev_dbg(&dev->dev, "%s\n", dev->nodename);
-
-	xennet_disconnect_backend(info);
-	return 0;
-}
-
-static int xen_net_read_mac(struct xenbus_device *dev, u8 mac[])
-{
-	char *s, *e, *macstr;
-	int i;
-
-	macstr = s = xenbus_read(XBT_NIL, dev->nodename, "mac", NULL);
-	if (IS_ERR(macstr))
-		return PTR_ERR(macstr);
-
-	for (i = 0; i < ETH_ALEN; i++) {
-		mac[i] = simple_strtoul(s, &e, 16);
-		if ((s == e) || (*e != ((i == ETH_ALEN-1) ? '\0' : ':'))) {
-			kfree(macstr);
-			return -ENOENT;
-		}
-		s = e+1;
-	}
-
-	kfree(macstr);
-	return 0;
-}
-
-static int setup_netfront(struct xenbus_device *dev, struct netfront_info *info)
-{
-	struct xen_netif_tx_sring *txs;
-	struct xen_netif_rx_sring *rxs;
-	int err;
-	struct net_device *netdev = info->netdev;
-
-	info->tx_ring_ref = GRANT_INVALID_REF;
-	info->rx_ring_ref = GRANT_INVALID_REF;
-	info->rx.sring = NULL;
-	info->tx.sring = NULL;
-	netdev->irq = 0;
-
-	err = xen_net_read_mac(dev, netdev->dev_addr);
-	if (err) {
-		xenbus_dev_fatal(dev, err, "parsing %s/mac", dev->nodename);
-		goto fail;
-	}
-
-	txs = (struct xen_netif_tx_sring *)get_zeroed_page(GFP_NOIO | __GFP_HIGH);
-	if (!txs) {
-		err = -ENOMEM;
-		xenbus_dev_fatal(dev, err, "allocating tx ring page");
-		goto fail;
-	}
-	SHARED_RING_INIT(txs);
-	FRONT_RING_INIT(&info->tx, txs, PAGE_SIZE);
-
-	err = xenbus_grant_ring(dev, virt_to_mfn(txs));
-	if (err < 0) {
-		free_page((unsigned long)txs);
-		goto fail;
-	}
-
-	info->tx_ring_ref = err;
-	rxs = (struct xen_netif_rx_sring *)get_zeroed_page(GFP_NOIO | __GFP_HIGH);
-	if (!rxs) {
-		err = -ENOMEM;
-		xenbus_dev_fatal(dev, err, "allocating rx ring page");
-		goto fail;
-	}
-	SHARED_RING_INIT(rxs);
-	FRONT_RING_INIT(&info->rx, rxs, PAGE_SIZE);
-
-	err = xenbus_grant_ring(dev, virt_to_mfn(rxs));
-	if (err < 0) {
-		free_page((unsigned long)rxs);
-		goto fail;
-	}
-	info->rx_ring_ref = err;
-
-	err = xenbus_alloc_evtchn(dev, &info->evtchn);
-	if (err)
-		goto fail;
-
-	err = bind_evtchn_to_irqhandler(info->evtchn, xennet_interrupt,
-					0, netdev->name, netdev);
-	if (err < 0)
-		goto fail;
-	netdev->irq = err;
-	return 0;
-
- fail:
-	return err;
-}
-
-/* Common code used when first setting up, and when resuming. */
-static int talk_to_netback(struct xenbus_device *dev,
-			   struct netfront_info *info)
-{
-	const char *message;
-	struct xenbus_transaction xbt;
-	int err;
-
-	/* Create shared ring, alloc event channel. */
-	err = setup_netfront(dev, info);
-	if (err)
-		goto out;
-
-again:
-	err = xenbus_transaction_start(&xbt);
-	if (err) {
-		xenbus_dev_fatal(dev, err, "starting transaction");
-		goto destroy_ring;
-	}
-
-	err = xenbus_printf(xbt, dev->nodename, "tx-ring-ref", "%u",
-			    info->tx_ring_ref);
-	if (err) {
-		message = "writing tx ring-ref";
-		goto abort_transaction;
-	}
-	err = xenbus_printf(xbt, dev->nodename, "rx-ring-ref", "%u",
-			    info->rx_ring_ref);
-	if (err) {
-		message = "writing rx ring-ref";
-		goto abort_transaction;
-	}
-	err = xenbus_printf(xbt, dev->nodename,
-			    "event-channel", "%u", info->evtchn);
-	if (err) {
-		message = "writing event-channel";
-		goto abort_transaction;
-	}
-
-	err = xenbus_printf(xbt, dev->nodename, "request-rx-copy", "%u",
-			    1);
-	if (err) {
-		message = "writing request-rx-copy";
-		goto abort_transaction;
-	}
-
-	err = xenbus_printf(xbt, dev->nodename, "feature-rx-notify", "%d", 1);
-	if (err) {
-		message = "writing feature-rx-notify";
-		goto abort_transaction;
-	}
-
-	err = xenbus_printf(xbt, dev->nodename, "feature-sg", "%d", 1);
-	if (err) {
-		message = "writing feature-sg";
-		goto abort_transaction;
-	}
-
-	err = xenbus_printf(xbt, dev->nodename, "feature-gso-tcpv4", "%d", 1);
-	if (err) {
-		message = "writing feature-gso-tcpv4";
-		goto abort_transaction;
-	}
-
-	err = xenbus_transaction_end(xbt, 0);
-	if (err) {
-		if (err == -EAGAIN)
-			goto again;
-		xenbus_dev_fatal(dev, err, "completing transaction");
-		goto destroy_ring;
-	}
-
-	return 0;
-
- abort_transaction:
-	xenbus_transaction_end(xbt, 1);
-	xenbus_dev_fatal(dev, err, "%s", message);
- destroy_ring:
-	xennet_disconnect_backend(info);
- out:
-	return err;
-}
-
-static int xennet_connect(struct net_device *dev)
-{
-	struct netfront_info *np = netdev_priv(dev);
-	int i, requeue_idx, err;
-	struct sk_buff *skb;
-	grant_ref_t ref;
-	struct xen_netif_rx_request *req;
-	unsigned int feature_rx_copy;
-
-	err = xenbus_scanf(XBT_NIL, np->xbdev->otherend,
-			   "feature-rx-copy", "%u", &feature_rx_copy);
-	if (err != 1)
-		feature_rx_copy = 0;
-
-	if (!feature_rx_copy) {
-		dev_info(&dev->dev,
-			 "backend does not support copying receive path\n");
-		return -ENODEV;
-	}
-
-	err = talk_to_netback(np->xbdev, np);
-	if (err)
-		return err;
-
-	rtnl_lock();
-	netdev_update_features(dev);
-	rtnl_unlock();
-
-	spin_lock_bh(&np->rx_lock);
-	spin_lock_irq(&np->tx_lock);
-
-	/* Step 1: Discard all pending TX packet fragments. */
-	xennet_release_tx_bufs(np);
-
-	/* Step 2: Rebuild the RX buffer freelist and the RX ring itself. */
-	for (requeue_idx = 0, i = 0; i < NET_RX_RING_SIZE; i++) {
-		skb_frag_t *frag;
-		const struct page *page;
-		if (!np->rx_skbs[i])
-			continue;
-
-		skb = np->rx_skbs[requeue_idx] = xennet_get_rx_skb(np, i);
-		ref = np->grant_rx_ref[requeue_idx] = xennet_get_rx_ref(np, i);
-		req = RING_GET_REQUEST(&np->rx, requeue_idx);
-
-		frag = &skb_shinfo(skb)->frags[0];
-		page = skb_frag_page(frag);
-		gnttab_grant_foreign_access_ref(
-			ref, np->xbdev->otherend_id,
-			pfn_to_mfn(page_to_pfn(page)),
-			0);
-		req->gref = ref;
-		req->id   = requeue_idx;
-
-		requeue_idx++;
-	}
-
-	np->rx.req_prod_pvt = requeue_idx;
-
-	/*
-	 * Step 3: All public and private state should now be sane.  Get
-	 * ready to start sending and receiving packets and give the driver
-	 * domain a kick because we've probably just requeued some
-	 * packets.
-	 */
-	netif_carrier_on(np->netdev);
-	notify_remote_via_irq(np->netdev->irq);
-	xennet_tx_buf_gc(dev);
-	xennet_alloc_rx_buffers(dev);
-
-	spin_unlock_irq(&np->tx_lock);
-	spin_unlock_bh(&np->rx_lock);
-
-	return 0;
-}
-
-/**
- * Callback received when the backend's state changes.
- */
-static void netback_changed(struct xenbus_device *dev,
-			    enum xenbus_state backend_state)
-{
-	struct netfront_info *np = dev_get_drvdata(&dev->dev);
-	struct net_device *netdev = np->netdev;
-
-	dev_dbg(&dev->dev, "%s\n", xenbus_strstate(backend_state));
-
-	switch (backend_state) {
-	case XenbusStateInitialising:
-	case XenbusStateInitialised:
-	case XenbusStateReconfiguring:
-	case XenbusStateReconfigured:
-	case XenbusStateUnknown:
-	case XenbusStateClosed:
-		break;
-
-	case XenbusStateInitWait:
-		if (dev->state != XenbusStateInitialising)
-			break;
-		if (xennet_connect(netdev) != 0)
-			break;
-		xenbus_switch_state(dev, XenbusStateConnected);
-		break;
-
-	case XenbusStateConnected:
-		netif_notify_peers(netdev);
-		break;
-
-	case XenbusStateClosing:
-		xenbus_frontend_closed(dev);
-		break;
-	}
-}
-
-static const struct xennet_stat {
-	char name[ETH_GSTRING_LEN];
-	u16 offset;
-} xennet_stats[] = {
-	{
-		"rx_gso_checksum_fixup",
-		offsetof(struct netfront_info, rx_gso_checksum_fixup)
-	},
-};
-
-static int xennet_get_sset_count(struct net_device *dev, int string_set)
-{
-	switch (string_set) {
-	case ETH_SS_STATS:
-		return ARRAY_SIZE(xennet_stats);
-	default:
-		return -EINVAL;
-	}
-}
-
-static void xennet_get_ethtool_stats(struct net_device *dev,
-				     struct ethtool_stats *stats, u64 * data)
-{
-	void *np = netdev_priv(dev);
-	int i;
-
-	for (i = 0; i < ARRAY_SIZE(xennet_stats); i++)
-		data[i] = *(unsigned long *)(np + xennet_stats[i].offset);
-}
-
-static void xennet_get_strings(struct net_device *dev, u32 stringset, u8 * data)
-{
-	int i;
-
-	switch (stringset) {
-	case ETH_SS_STATS:
-		for (i = 0; i < ARRAY_SIZE(xennet_stats); i++)
-			memcpy(data + i * ETH_GSTRING_LEN,
-			       xennet_stats[i].name, ETH_GSTRING_LEN);
-		break;
-	}
-}
-
-static const struct ethtool_ops xennet_ethtool_ops =
-{
-	.get_link = ethtool_op_get_link,
-
-	.get_sset_count = xennet_get_sset_count,
-	.get_ethtool_stats = xennet_get_ethtool_stats,
-	.get_strings = xennet_get_strings,
-};
-
-#ifdef CONFIG_SYSFS
-static ssize_t show_rxbuf_min(struct device *dev,
-			      struct device_attribute *attr, char *buf)
-{
-	struct net_device *netdev = to_net_dev(dev);
-	struct netfront_info *info = netdev_priv(netdev);
-
-	return sprintf(buf, "%u\n", info->rx_min_target);
-}
-
-static ssize_t store_rxbuf_min(struct device *dev,
-			       struct device_attribute *attr,
-			       const char *buf, size_t len)
-{
-	struct net_device *netdev = to_net_dev(dev);
-	struct netfront_info *np = netdev_priv(netdev);
-	char *endp;
-	unsigned long target;
-
-	if (!capable(CAP_NET_ADMIN))
-		return -EPERM;
-
-	target = simple_strtoul(buf, &endp, 0);
-	if (endp == buf)
-		return -EBADMSG;
-
-	if (target < RX_MIN_TARGET)
-		target = RX_MIN_TARGET;
-	if (target > RX_MAX_TARGET)
-		target = RX_MAX_TARGET;
-
-	spin_lock_bh(&np->rx_lock);
-	if (target > np->rx_max_target)
-		np->rx_max_target = target;
-	np->rx_min_target = target;
-	if (target > np->rx_target)
-		np->rx_target = target;
-
-	xennet_alloc_rx_buffers(netdev);
-
-	spin_unlock_bh(&np->rx_lock);
-	return len;
-}
-
-static ssize_t show_rxbuf_max(struct device *dev,
-			      struct device_attribute *attr, char *buf)
-{
-	struct net_device *netdev = to_net_dev(dev);
-	struct netfront_info *info = netdev_priv(netdev);
-
-	return sprintf(buf, "%u\n", info->rx_max_target);
-}
-
-static ssize_t store_rxbuf_max(struct device *dev,
-			       struct device_attribute *attr,
-			       const char *buf, size_t len)
-{
-	struct net_device *netdev = to_net_dev(dev);
-	struct netfront_info *np = netdev_priv(netdev);
-	char *endp;
-	unsigned long target;
-
-	if (!capable(CAP_NET_ADMIN))
-		return -EPERM;
-
-	target = simple_strtoul(buf, &endp, 0);
-	if (endp == buf)
-		return -EBADMSG;
-
-	if (target < RX_MIN_TARGET)
-		target = RX_MIN_TARGET;
-	if (target > RX_MAX_TARGET)
-		target = RX_MAX_TARGET;
-
-	spin_lock_bh(&np->rx_lock);
-	if (target < np->rx_min_target)
-		np->rx_min_target = target;
-	np->rx_max_target = target;
-	if (target < np->rx_target)
-		np->rx_target = target;
-
-	xennet_alloc_rx_buffers(netdev);
-
-	spin_unlock_bh(&np->rx_lock);
-	return len;
-}
-
-static ssize_t show_rxbuf_cur(struct device *dev,
-			      struct device_attribute *attr, char *buf)
-{
-	struct net_device *netdev = to_net_dev(dev);
-	struct netfront_info *info = netdev_priv(netdev);
-
-	return sprintf(buf, "%u\n", info->rx_target);
-}
-
-static struct device_attribute xennet_attrs[] = {
-	__ATTR(rxbuf_min, S_IRUGO|S_IWUSR, show_rxbuf_min, store_rxbuf_min),
-	__ATTR(rxbuf_max, S_IRUGO|S_IWUSR, show_rxbuf_max, store_rxbuf_max),
-	__ATTR(rxbuf_cur, S_IRUGO, show_rxbuf_cur, NULL),
-};
-
-static int xennet_sysfs_addif(struct net_device *netdev)
-{
-	int i;
-	int err;
-
-	for (i = 0; i < ARRAY_SIZE(xennet_attrs); i++) {
-		err = device_create_file(&netdev->dev,
-					   &xennet_attrs[i]);
-		if (err)
-			goto fail;
-	}
-	return 0;
-
- fail:
-	while (--i >= 0)
-		device_remove_file(&netdev->dev, &xennet_attrs[i]);
-	return err;
-}
-
-static void xennet_sysfs_delif(struct net_device *netdev)
-{
-	int i;
-
-	for (i = 0; i < ARRAY_SIZE(xennet_attrs); i++)
-		device_remove_file(&netdev->dev, &xennet_attrs[i]);
-}
-
-#endif /* CONFIG_SYSFS */
-
-static const struct xenbus_device_id netfront_ids[] = {
-	{ "vif" },
-	{ "" }
-};
-
-
-static int __devexit xennet_remove(struct xenbus_device *dev)
-{
-	struct netfront_info *info = dev_get_drvdata(&dev->dev);
-
-	dev_dbg(&dev->dev, "%s\n", dev->nodename);
-
-	xennet_disconnect_backend(info);
-
-	xennet_sysfs_delif(info->netdev);
-
-	unregister_netdev(info->netdev);
-
-	del_timer_sync(&info->rx_refill_timer);
-
-	free_percpu(info->stats);
-
-	free_netdev(info->netdev);
-
-	return 0;
-}
-
-static DEFINE_XENBUS_DRIVER(netfront, ,
-	.probe = netfront_probe,
-	.remove = __devexit_p(xennet_remove),
-	.resume = netfront_resume,
-	.otherend_changed = netback_changed,
-);
-
-static int __init netif_init(void)
-{
-	if (!xen_domain())
-		return -ENODEV;
-
-	if (xen_initial_domain())
-		return 0;
-
-	if (xen_hvm_domain() && !xen_platform_pci_unplug)
-		return -ENODEV;
-
-	printk(KERN_INFO "Initialising Xen virtual ethernet driver.\n");
-
-	return xenbus_register_frontend(&netfront_driver);
-}
-module_init(netif_init);
-
-
-static void __exit netif_exit(void)
-{
-	if (xen_initial_domain())
-		return;
-
-	xenbus_unregister_driver(&netfront_driver);
-}
-module_exit(netif_exit);
-
-MODULE_DESCRIPTION("Xen virtual network device frontend");
-MODULE_LICENSE("GPL");
-MODULE_ALIAS("xen:vif");
-MODULE_ALIAS("xennet");