1 files changed, 370 insertions, 0 deletions

diff --git a/drivers/net/xen-netback/interface.c b/drivers/net/xen-netback/interface.c
new file mode 100644
index 000000000000..0ca86f9ec4ed
--- /dev/null
+++ b/drivers/net/xen-netback/interface.c
@@ -0,0 +1,370 @@
+/*
+ * 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 u32 xenvif_fix_features(struct net_device *dev, u32 features)
+{
+        struct xenvif *vif = netdev_priv(dev);
+
+        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;
+
+        return features;
+}
+
+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_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,
+        .ndo_fix_features = xenvif_fix_features,
+};
+
+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;
+        dev->hw_features = NETIF_F_SG | NETIF_F_IP_CSUM | NETIF_F_TSO;
+        dev->features = dev->hw_features;
+        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;
+
+        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();
+        if (netif_running(vif->dev))
+                xenvif_up(vif);
+        if (!vif->can_sg && vif->dev->mtu > ETH_DATA_LEN)
+                dev_set_mtu(vif->dev, ETH_DATA_LEN);
+        netdev_update_features(vif->dev);
+        netif_carrier_on(vif->dev);
+        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);
+}