2011-03-15 08:06:18 +08:00
|
|
|
/*
|
|
|
|
* 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;
|
|
|
|
}
|
|
|
|
|
2011-04-19 11:35:06 +08:00
|
|
|
static u32 xenvif_fix_features(struct net_device *dev, u32 features)
|
2011-03-15 08:06:18 +08:00
|
|
|
{
|
|
|
|
struct xenvif *vif = netdev_priv(dev);
|
|
|
|
|
2011-04-19 11:35:06 +08:00
|
|
|
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;
|
2011-03-15 08:06:18 +08:00
|
|
|
|
2011-04-19 11:35:06 +08:00
|
|
|
return features;
|
2011-03-15 08:06:18 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
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,
|
2011-04-19 11:35:06 +08:00
|
|
|
.ndo_fix_features = xenvif_fix_features,
|
2011-03-15 08:06:18 +08:00
|
|
|
};
|
|
|
|
|
|
|
|
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;
|
2011-04-19 11:35:06 +08:00
|
|
|
dev->hw_features = NETIF_F_SG | NETIF_F_IP_CSUM | NETIF_F_TSO;
|
|
|
|
dev->features = dev->hw_features;
|
2011-03-15 08:06:18 +08:00
|
|
|
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);
|
2011-04-19 11:35:06 +08:00
|
|
|
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);
|
2011-03-15 08:06:18 +08:00
|
|
|
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);
|
|
|
|
}
|