Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6 into for-linus-1

* 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6: (9356 commits)
  [media] rc: update for bitop name changes
  fs: simplify iget & friends
  fs: pull inode->i_lock up out of writeback_single_inode
  fs: rename inode_lock to inode_hash_lock
  fs: move i_wb_list out from under inode_lock
  fs: move i_sb_list out from under inode_lock
  fs: remove inode_lock from iput_final and prune_icache
  fs: Lock the inode LRU list separately
  fs: factor inode disposal
  fs: protect inode->i_state with inode->i_lock
  lib, arch: add filter argument to show_mem and fix private implementations
  SLUB: Write to per cpu data when allocating it
  slub: Fix debugobjects with lockless fastpath
  autofs4: Do not potentially dereference NULL pointer returned by fget() in autofs_dev_ioctl_setpipefd()
  autofs4 - remove autofs4_lock
  autofs4 - fix d_manage() return on rcu-walk
  autofs4 - fix autofs4_expire_indirect() traversal
  autofs4 - fix dentry leak in autofs4_expire_direct()
  autofs4 - reinstate last used update on access
  vfs - check non-mountpoint dentry might block in __follow_mount_rcu()
  ...

NOTE!

This merge commit was created to fix compilation error. The block
tree was merged upstream and removed the 'elv_queue_empty()'
function which the new 'mtdswap' driver is using. So a simple
merge of the mtd tree with upstream does not compile. And the
mtd tree has already be published, so re-basing it is not an option.

To fix this unfortunate situation, I had to merge upstream into the
mtd-2.6.git tree without committing, put the fixup patch on top of
this, and then commit this. The result is that we do not have commits
which do not compile.

In other words, this merge commit "merges" 3 things: the MTD tree, the
upstream tree, and the fixup patch.

1 files changed, 424 insertions, 0 deletions

diff --git a/drivers/net/xen-netback/interface.c b/drivers/net/xen-netback/interface.c
new file mode 100644
index 00000000000..de569cc19da
--- /dev/null
+++ b/drivers/net/xen-netback/interface.c
@@ -0,0 +1,424 @@
+/*
+ * Network-device interface management.
+ *
+ * Copyright (c) 2004-2005, Keir Fraser
+ *
+ * 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 "common.h"
+
+#include <linux/ethtool.h>
+#include <linux/rtnetlink.h>
+#include <linux/if_vlan.h>
+
+#include <xen/events.h>
+#include <asm/xen/hypercall.h>
+
+#define XENVIF_QUEUE_LENGTH 32
+
+void xenvif_get(struct xenvif *vif)
+{
+	atomic_inc(&vif->refcnt);
+}
+
+void xenvif_put(struct xenvif *vif)
+{
+	if (atomic_dec_and_test(&vif->refcnt))
+		wake_up(&vif->waiting_to_free);
+}
+
+int xenvif_schedulable(struct xenvif *vif)
+{
+	return netif_running(vif->dev) && netif_carrier_ok(vif->dev);
+}
+
+static int xenvif_rx_schedulable(struct xenvif *vif)
+{
+	return xenvif_schedulable(vif) && !xen_netbk_rx_ring_full(vif);
+}
+
+static irqreturn_t xenvif_interrupt(int irq, void *dev_id)
+{
+	struct xenvif *vif = dev_id;
+
+	if (vif->netbk == NULL)
+		return IRQ_NONE;
+
+	xen_netbk_schedule_xenvif(vif);
+
+	if (xenvif_rx_schedulable(vif))
+		netif_wake_queue(vif->dev);
+
+	return IRQ_HANDLED;
+}
+
+static int xenvif_start_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+	struct xenvif *vif = netdev_priv(dev);
+
+	BUG_ON(skb->dev != dev);
+
+	if (vif->netbk == NULL)
+		goto drop;
+
+	/* Drop the packet if the target domain has no receive buffers. */
+	if (!xenvif_rx_schedulable(vif))
+		goto drop;
+
+	/* Reserve ring slots for the worst-case number of fragments. */
+	vif->rx_req_cons_peek += xen_netbk_count_skb_slots(vif, skb);
+	xenvif_get(vif);
+
+	if (vif->can_queue && xen_netbk_must_stop_queue(vif))
+		netif_stop_queue(dev);
+
+	xen_netbk_queue_tx_skb(vif, skb);
+
+	return NETDEV_TX_OK;
+
+ drop:
+	vif->dev->stats.tx_dropped++;
+	dev_kfree_skb(skb);
+	return NETDEV_TX_OK;
+}
+
+void xenvif_receive_skb(struct xenvif *vif, struct sk_buff *skb)
+{
+	netif_rx_ni(skb);
+}
+
+void xenvif_notify_tx_completion(struct xenvif *vif)
+{
+	if (netif_queue_stopped(vif->dev) && xenvif_rx_schedulable(vif))
+		netif_wake_queue(vif->dev);
+}
+
+static struct net_device_stats *xenvif_get_stats(struct net_device *dev)
+{
+	struct xenvif *vif = netdev_priv(dev);
+	return &vif->dev->stats;
+}
+
+static void xenvif_up(struct xenvif *vif)
+{
+	xen_netbk_add_xenvif(vif);
+	enable_irq(vif->irq);
+	xen_netbk_check_rx_xenvif(vif);
+}
+
+static void xenvif_down(struct xenvif *vif)
+{
+	disable_irq(vif->irq);
+	xen_netbk_deschedule_xenvif(vif);
+	xen_netbk_remove_xenvif(vif);
+}
+
+static int xenvif_open(struct net_device *dev)
+{
+	struct xenvif *vif = netdev_priv(dev);
+	if (netif_carrier_ok(dev))
+		xenvif_up(vif);
+	netif_start_queue(dev);
+	return 0;
+}
+
+static int xenvif_close(struct net_device *dev)
+{
+	struct xenvif *vif = netdev_priv(dev);
+	if (netif_carrier_ok(dev))
+		xenvif_down(vif);
+	netif_stop_queue(dev);
+	return 0;
+}
+
+static int xenvif_change_mtu(struct net_device *dev, int mtu)
+{
+	struct xenvif *vif = netdev_priv(dev);
+	int max = vif->can_sg ? 65535 - VLAN_ETH_HLEN : ETH_DATA_LEN;
+
+	if (mtu > max)
+		return -EINVAL;
+	dev->mtu = mtu;
+	return 0;
+}
+
+static void xenvif_set_features(struct xenvif *vif)
+{
+	struct net_device *dev = vif->dev;
+	u32 features = dev->features;
+
+	if (vif->can_sg)
+		features |= NETIF_F_SG;
+	if (vif->gso || vif->gso_prefix)
+		features |= NETIF_F_TSO;
+	if (vif->csum)
+		features |= NETIF_F_IP_CSUM;
+
+	features &= ~(vif->features_disabled);
+
+	if (!(features & NETIF_F_SG) && dev->mtu > ETH_DATA_LEN)
+		dev->mtu = ETH_DATA_LEN;
+
+	dev->features = features;
+}
+
+static int xenvif_set_tx_csum(struct net_device *dev, u32 data)
+{
+	struct xenvif *vif = netdev_priv(dev);
+	if (data) {
+		if (!vif->csum)
+			return -EOPNOTSUPP;
+		vif->features_disabled &= ~NETIF_F_IP_CSUM;
+	} else {
+		vif->features_disabled |= NETIF_F_IP_CSUM;
+	}
+
+	xenvif_set_features(vif);
+	return 0;
+}
+
+static int xenvif_set_sg(struct net_device *dev, u32 data)
+{
+	struct xenvif *vif = netdev_priv(dev);
+	if (data) {
+		if (!vif->can_sg)
+			return -EOPNOTSUPP;
+		vif->features_disabled &= ~NETIF_F_SG;
+	} else {
+		vif->features_disabled |= NETIF_F_SG;
+	}
+
+	xenvif_set_features(vif);
+	return 0;
+}
+
+static int xenvif_set_tso(struct net_device *dev, u32 data)
+{
+	struct xenvif *vif = netdev_priv(dev);
+	if (data) {
+		if (!vif->gso && !vif->gso_prefix)
+			return -EOPNOTSUPP;
+		vif->features_disabled &= ~NETIF_F_TSO;
+	} else {
+		vif->features_disabled |= NETIF_F_TSO;
+	}
+
+	xenvif_set_features(vif);
+	return 0;
+}
+
+static const struct xenvif_stat {
+	char name[ETH_GSTRING_LEN];
+	u16 offset;
+} xenvif_stats[] = {
+	{
+		"rx_gso_checksum_fixup",
+		offsetof(struct xenvif, rx_gso_checksum_fixup)
+	},
+};
+
+static int xenvif_get_sset_count(struct net_device *dev, int string_set)
+{
+	switch (string_set) {
+	case ETH_SS_STATS:
+		return ARRAY_SIZE(xenvif_stats);
+	default:
+		return -EINVAL;
+	}
+}
+
+static void xenvif_get_ethtool_stats(struct net_device *dev,
+				     struct ethtool_stats *stats, u64 * data)
+{
+	void *vif = netdev_priv(dev);
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(xenvif_stats); i++)
+		data[i] = *(unsigned long *)(vif + xenvif_stats[i].offset);
+}
+
+static void xenvif_get_strings(struct net_device *dev, u32 stringset, u8 * data)
+{
+	int i;
+
+	switch (stringset) {
+	case ETH_SS_STATS:
+		for (i = 0; i < ARRAY_SIZE(xenvif_stats); i++)
+			memcpy(data + i * ETH_GSTRING_LEN,
+			       xenvif_stats[i].name, ETH_GSTRING_LEN);
+		break;
+	}
+}
+
+static struct ethtool_ops xenvif_ethtool_ops = {
+	.get_tx_csum	= ethtool_op_get_tx_csum,
+	.set_tx_csum	= xenvif_set_tx_csum,
+	.get_sg		= ethtool_op_get_sg,
+	.set_sg		= xenvif_set_sg,
+	.get_tso	= ethtool_op_get_tso,
+	.set_tso	= xenvif_set_tso,
+	.get_link	= ethtool_op_get_link,
+
+	.get_sset_count = xenvif_get_sset_count,
+	.get_ethtool_stats = xenvif_get_ethtool_stats,
+	.get_strings = xenvif_get_strings,
+};
+
+static struct net_device_ops xenvif_netdev_ops = {
+	.ndo_start_xmit	= xenvif_start_xmit,
+	.ndo_get_stats	= xenvif_get_stats,
+	.ndo_open	= xenvif_open,
+	.ndo_stop	= xenvif_close,
+	.ndo_change_mtu	= xenvif_change_mtu,
+};
+
+struct xenvif *xenvif_alloc(struct device *parent, domid_t domid,
+			    unsigned int handle)
+{
+	int err;
+	struct net_device *dev;
+	struct xenvif *vif;
+	char name[IFNAMSIZ] = {};
+
+	snprintf(name, IFNAMSIZ - 1, "vif%u.%u", domid, handle);
+	dev = alloc_netdev(sizeof(struct xenvif), name, ether_setup);
+	if (dev == NULL) {
+		pr_warn("Could not allocate netdev\n");
+		return ERR_PTR(-ENOMEM);
+	}
+
+	SET_NETDEV_DEV(dev, parent);
+
+	vif = netdev_priv(dev);
+	vif->domid  = domid;
+	vif->handle = handle;
+	vif->netbk  = NULL;
+	vif->can_sg = 1;
+	vif->csum = 1;
+	atomic_set(&vif->refcnt, 1);
+	init_waitqueue_head(&vif->waiting_to_free);
+	vif->dev = dev;
+	INIT_LIST_HEAD(&vif->schedule_list);
+	INIT_LIST_HEAD(&vif->notify_list);
+
+	vif->credit_bytes = vif->remaining_credit = ~0UL;
+	vif->credit_usec  = 0UL;
+	init_timer(&vif->credit_timeout);
+	/* Initialize 'expires' now: it's used to track the credit window. */
+	vif->credit_timeout.expires = jiffies;
+
+	dev->netdev_ops	= &xenvif_netdev_ops;
+	xenvif_set_features(vif);
+	SET_ETHTOOL_OPS(dev, &xenvif_ethtool_ops);
+
+	dev->tx_queue_len = XENVIF_QUEUE_LENGTH;
+
+	/*
+	 * Initialise a dummy MAC address. We choose the numerically
+	 * largest non-broadcast address to prevent the address getting
+	 * stolen by an Ethernet bridge for STP purposes.
+	 * (FE:FF:FF:FF:FF:FF)
+	 */
+	memset(dev->dev_addr, 0xFF, ETH_ALEN);
+	dev->dev_addr[0] &= ~0x01;
+
+	netif_carrier_off(dev);
+
+	err = register_netdev(dev);
+	if (err) {
+		netdev_warn(dev, "Could not register device: err=%d\n", err);
+		free_netdev(dev);
+		return ERR_PTR(err);
+	}
+
+	netdev_dbg(dev, "Successfully created xenvif\n");
+	return vif;
+}
+
+int xenvif_connect(struct xenvif *vif, unsigned long tx_ring_ref,
+		   unsigned long rx_ring_ref, unsigned int evtchn)
+{
+	int err = -ENOMEM;
+
+	/* Already connected through? */
+	if (vif->irq)
+		return 0;
+
+	xenvif_set_features(vif);
+
+	err = xen_netbk_map_frontend_rings(vif, tx_ring_ref, rx_ring_ref);
+	if (err < 0)
+		goto err;
+
+	err = bind_interdomain_evtchn_to_irqhandler(
+		vif->domid, evtchn, xenvif_interrupt, 0,
+		vif->dev->name, vif);
+	if (err < 0)
+		goto err_unmap;
+	vif->irq = err;
+	disable_irq(vif->irq);
+
+	xenvif_get(vif);
+
+	rtnl_lock();
+	netif_carrier_on(vif->dev);
+	if (netif_running(vif->dev))
+		xenvif_up(vif);
+	rtnl_unlock();
+
+	return 0;
+err_unmap:
+	xen_netbk_unmap_frontend_rings(vif);
+err:
+	return err;
+}
+
+void xenvif_disconnect(struct xenvif *vif)
+{
+	struct net_device *dev = vif->dev;
+	if (netif_carrier_ok(dev)) {
+		rtnl_lock();
+		netif_carrier_off(dev); /* discard queued packets */
+		if (netif_running(dev))
+			xenvif_down(vif);
+		rtnl_unlock();
+		xenvif_put(vif);
+	}
+
+	atomic_dec(&vif->refcnt);
+	wait_event(vif->waiting_to_free, atomic_read(&vif->refcnt) == 0);
+
+	del_timer_sync(&vif->credit_timeout);
+
+	if (vif->irq)
+		unbind_from_irqhandler(vif->irq, vif);
+
+	unregister_netdev(vif->dev);
+
+	xen_netbk_unmap_frontend_rings(vif);
+
+	free_netdev(vif->dev);
+}