mirror of
https://github.com/xen-project/xen.git
synced 2026-10-29 10:40:03 +01:00
It was suggested on the xen-users list that it would be useful if the
loopback driver could instantiate an arbitrary number of interfaces, so the attached patch does that. [Also retab at the same time]
This commit is contained in:
kaf24@firebug.cl.cam.ac.uk committed
1 parent
9ead829c58
commit
60ea7f88bd
1 file changed
+116
-89
@@ -29,136 +29,163 @@
|
||||
#include <linux/skbuff.h>
|
||||
#include <net/dst.h>
|
||||
|
||||
static int nloopbacks = 1;
|
||||
module_param(nloopbacks, int, 0);
|
||||
MODULE_PARM_DESC(nloopbacks, "Number of netback-loopback devices to create");
|
||||
|
||||
struct net_private {
|
||||
struct net_device *loopback_dev;
|
||||
struct net_device_stats stats;
|
||||
struct net_device *loopback_dev;
|
||||
struct net_device_stats stats;
|
||||
};
|
||||
|
||||
static int loopback_open(struct net_device *dev)
|
||||
{
|
||||
struct net_private *np = netdev_priv(dev);
|
||||
memset(&np->stats, 0, sizeof(np->stats));
|
||||
netif_start_queue(dev);
|
||||
return 0;
|
||||
struct net_private *np = netdev_priv(dev);
|
||||
memset(&np->stats, 0, sizeof(np->stats));
|
||||
netif_start_queue(dev);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int loopback_close(struct net_device *dev)
|
||||
{
|
||||
netif_stop_queue(dev);
|
||||
return 0;
|
||||
netif_stop_queue(dev);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int loopback_start_xmit(struct sk_buff *skb, struct net_device *dev)
|
||||
{
|
||||
struct net_private *np = netdev_priv(dev);
|
||||
struct net_private *np = netdev_priv(dev);
|
||||
|
||||
dst_release(skb->dst);
|
||||
skb->dst = NULL;
|
||||
dst_release(skb->dst);
|
||||
skb->dst = NULL;
|
||||
|
||||
skb_orphan(skb);
|
||||
skb_orphan(skb);
|
||||
|
||||
np->stats.tx_bytes += skb->len;
|
||||
np->stats.tx_packets++;
|
||||
np->stats.tx_bytes += skb->len;
|
||||
np->stats.tx_packets++;
|
||||
|
||||
/* Switch to loopback context. */
|
||||
dev = np->loopback_dev;
|
||||
np = netdev_priv(dev);
|
||||
/* Switch to loopback context. */
|
||||
dev = np->loopback_dev;
|
||||
np = netdev_priv(dev);
|
||||
|
||||
np->stats.rx_bytes += skb->len;
|
||||
np->stats.rx_packets++;
|
||||
np->stats.rx_bytes += skb->len;
|
||||
np->stats.rx_packets++;
|
||||
|
||||
if ( skb->ip_summed == CHECKSUM_HW )
|
||||
{
|
||||
/* Defer checksum calculation. */
|
||||
skb->proto_csum_blank = 1;
|
||||
/* Must be a local packet: assert its integrity. */
|
||||
skb->proto_csum_valid = 1;
|
||||
}
|
||||
if (skb->ip_summed == CHECKSUM_HW) {
|
||||
/* Defer checksum calculation. */
|
||||
skb->proto_csum_blank = 1;
|
||||
/* Must be a local packet: assert its integrity. */
|
||||
skb->proto_csum_valid = 1;
|
||||
}
|
||||
|
||||
skb->ip_summed = skb->proto_csum_valid ?
|
||||
CHECKSUM_UNNECESSARY : CHECKSUM_NONE;
|
||||
skb->ip_summed = skb->proto_csum_valid ?
|
||||
CHECKSUM_UNNECESSARY : CHECKSUM_NONE;
|
||||
|
||||
skb->pkt_type = PACKET_HOST; /* overridden by eth_type_trans() */
|
||||
skb->protocol = eth_type_trans(skb, dev);
|
||||
skb->dev = dev;
|
||||
dev->last_rx = jiffies;
|
||||
netif_rx(skb);
|
||||
skb->pkt_type = PACKET_HOST; /* overridden by eth_type_trans() */
|
||||
skb->protocol = eth_type_trans(skb, dev);
|
||||
skb->dev = dev;
|
||||
dev->last_rx = jiffies;
|
||||
netif_rx(skb);
|
||||
|
||||
return 0;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct net_device_stats *loopback_get_stats(struct net_device *dev)
|
||||
{
|
||||
struct net_private *np = netdev_priv(dev);
|
||||
return &np->stats;
|
||||
struct net_private *np = netdev_priv(dev);
|
||||
return &np->stats;
|
||||
}
|
||||
|
||||
static void loopback_construct(struct net_device *dev, struct net_device *lo)
|
||||
{
|
||||
struct net_private *np = netdev_priv(dev);
|
||||
struct net_private *np = netdev_priv(dev);
|
||||
|
||||
np->loopback_dev = lo;
|
||||
np->loopback_dev = lo;
|
||||
|
||||
dev->open = loopback_open;
|
||||
dev->stop = loopback_close;
|
||||
dev->hard_start_xmit = loopback_start_xmit;
|
||||
dev->get_stats = loopback_get_stats;
|
||||
dev->open = loopback_open;
|
||||
dev->stop = loopback_close;
|
||||
dev->hard_start_xmit = loopback_start_xmit;
|
||||
dev->get_stats = loopback_get_stats;
|
||||
|
||||
dev->tx_queue_len = 0;
|
||||
dev->tx_queue_len = 0;
|
||||
|
||||
dev->features = NETIF_F_HIGHDMA | NETIF_F_LLTX;
|
||||
dev->features = NETIF_F_HIGHDMA | NETIF_F_LLTX;
|
||||
|
||||
/*
|
||||
* We do not set a jumbo MTU on the interface. Otherwise the network
|
||||
* stack will try to send large packets that will get dropped by the
|
||||
* Ethernet bridge (unless the physical Ethernet interface is configured
|
||||
* to transfer jumbo packets). If a larger MTU is desired then the system
|
||||
* administrator can specify it using the 'ifconfig' command.
|
||||
*/
|
||||
/*dev->mtu = 16*1024;*/
|
||||
/*
|
||||
* We do not set a jumbo MTU on the interface. Otherwise the network
|
||||
* stack will try to send large packets that will get dropped by the
|
||||
* Ethernet bridge (unless the physical Ethernet interface is
|
||||
* configured to transfer jumbo packets). If a larger MTU is desired
|
||||
* then the system administrator can specify it using the 'ifconfig'
|
||||
* command.
|
||||
*/
|
||||
/*dev->mtu = 16*1024;*/
|
||||
}
|
||||
|
||||
static int __init make_loopback(int i)
|
||||
{
|
||||
struct net_device *dev1, *dev2;
|
||||
char dev_name[IFNAMSIZ];
|
||||
int err = -ENOMEM;
|
||||
|
||||
sprintf(dev_name, "vif0.%d", i);
|
||||
dev1 = alloc_netdev(sizeof(struct net_private), dev_name, ether_setup);
|
||||
sprintf(dev_name, "veth%d", i);
|
||||
dev2 = alloc_netdev(sizeof(struct net_private), dev_name, ether_setup);
|
||||
if ((dev1 == NULL) || (dev2 == NULL))
|
||||
goto fail;
|
||||
|
||||
loopback_construct(dev1, dev2);
|
||||
loopback_construct(dev2, dev1);
|
||||
|
||||
dev1->features |= NETIF_F_NO_CSUM;
|
||||
dev2->features |= NETIF_F_IP_CSUM;
|
||||
|
||||
/*
|
||||
* Initialise a dummy MAC address for the 'dummy backend' interface. We
|
||||
* choose the numerically largest non-broadcast address to prevent the
|
||||
* address getting stolen by an Ethernet bridge for STP purposes.
|
||||
*/
|
||||
memset(dev1->dev_addr, 0xFF, ETH_ALEN);
|
||||
dev1->dev_addr[0] &= ~0x01;
|
||||
|
||||
if ((err = register_netdev(dev1)) != 0)
|
||||
goto fail;
|
||||
|
||||
if ((err = register_netdev(dev2)) != 0) {
|
||||
unregister_netdev(dev1);
|
||||
goto fail;
|
||||
}
|
||||
|
||||
return 0;
|
||||
|
||||
fail:
|
||||
if (dev1 != NULL)
|
||||
kfree(dev1);
|
||||
if (dev2 != NULL)
|
||||
kfree(dev2);
|
||||
return err;
|
||||
}
|
||||
|
||||
static int __init loopback_init(void)
|
||||
{
|
||||
struct net_device *dev1, *dev2;
|
||||
int err = -ENOMEM;
|
||||
int i, err = 0;
|
||||
|
||||
dev1 = alloc_netdev(sizeof(struct net_private), "vif0.0", ether_setup);
|
||||
dev2 = alloc_netdev(sizeof(struct net_private), "veth0", ether_setup);
|
||||
if ( (dev1 == NULL) || (dev2 == NULL) )
|
||||
goto fail;
|
||||
for (i = 0; i < nloopbacks; i++)
|
||||
if ((err = make_loopback(i)) != 0)
|
||||
break;
|
||||
|
||||
loopback_construct(dev1, dev2);
|
||||
loopback_construct(dev2, dev1);
|
||||
|
||||
dev1->features |= NETIF_F_NO_CSUM;
|
||||
dev2->features |= NETIF_F_IP_CSUM;
|
||||
|
||||
/*
|
||||
* Initialise a dummy MAC address for the 'dummy backend' interface. We
|
||||
* choose the numerically largest non-broadcast address to prevent the
|
||||
* address getting stolen by an Ethernet bridge for STP purposes.
|
||||
*/
|
||||
memset(dev1->dev_addr, 0xFF, ETH_ALEN);
|
||||
dev1->dev_addr[0] &= ~0x01;
|
||||
|
||||
if ( (err = register_netdev(dev1)) != 0 )
|
||||
goto fail;
|
||||
|
||||
if ( (err = register_netdev(dev2)) != 0 )
|
||||
{
|
||||
unregister_netdev(dev1);
|
||||
goto fail;
|
||||
}
|
||||
|
||||
return 0;
|
||||
|
||||
fail:
|
||||
if ( dev1 != NULL )
|
||||
kfree(dev1);
|
||||
if ( dev2 != NULL )
|
||||
kfree(dev2);
|
||||
return err;
|
||||
return err;
|
||||
}
|
||||
|
||||
module_init(loopback_init);
|
||||
|
||||
/*
|
||||
* Local variables:
|
||||
* c-file-style: "linux"
|
||||
* indent-tabs-mode: t
|
||||
* c-indent-level: 8
|
||||
* c-basic-offset: 8
|
||||
* tab-width: 8
|
||||
* End:
|
||||
*/
|
||||