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path: root/drivers/net/xen-netfront.c
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Diffstat (limited to 'drivers/net/xen-netfront.c')
-rw-r--r--drivers/net/xen-netfront.c66
1 files changed, 39 insertions, 27 deletions
diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c
index 698b905058d..663b32c2e93 100644
--- a/drivers/net/xen-netfront.c
+++ b/drivers/net/xen-netfront.c
@@ -47,6 +47,7 @@
#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>
@@ -489,6 +490,7 @@ static int xennet_start_xmit(struct sk_buff *skb, struct net_device *dev)
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)) {
@@ -498,12 +500,12 @@ static int xennet_start_xmit(struct sk_buff *skb, struct net_device *dev)
goto drop;
}
- spin_lock_irq(&np->tx_lock);
+ 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_irq(&np->tx_lock);
+ spin_unlock_irqrestore(&np->tx_lock, flags);
goto drop;
}
@@ -574,7 +576,7 @@ static int xennet_start_xmit(struct sk_buff *skb, struct net_device *dev)
if (!netfront_tx_slot_available(np))
netif_stop_queue(dev);
- spin_unlock_irq(&np->tx_lock);
+ spin_unlock_irqrestore(&np->tx_lock, flags);
return NETDEV_TX_OK;
@@ -1228,6 +1230,33 @@ static int xennet_set_features(struct net_device *dev,
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,
@@ -1239,6 +1268,9 @@ static const struct net_device_ops xennet_netdev_ops = {
.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)
@@ -1248,11 +1280,8 @@ static struct net_device * __devinit xennet_create_dev(struct xenbus_device *dev
struct netfront_info *np;
netdev = alloc_etherdev(sizeof(struct netfront_info));
- if (!netdev) {
- printk(KERN_WARNING "%s> alloc_etherdev failed.\n",
- __func__);
+ if (!netdev)
return ERR_PTR(-ENOMEM);
- }
np = netdev_priv(netdev);
np->xbdev = dev;
@@ -1448,26 +1477,6 @@ static int xen_net_read_mac(struct xenbus_device *dev, u8 mac[])
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;
-}
-
static int setup_netfront(struct xenbus_device *dev, struct netfront_info *info)
{
struct xen_netif_tx_sring *txs;
@@ -1956,6 +1965,9 @@ static int __init netif_init(void)
if (xen_initial_domain())
return 0;
+ if (!xen_platform_pci_unplug)
+ return -ENODEV;
+
printk(KERN_INFO "Initialising Xen virtual ethernet driver.\n");
return xenbus_register_frontend(&netfront_driver);