xen-netback: Using a new state bit instead of carrier
This patch introduces a new state bit VIF_STATUS_CONNECTED to track whether the
vif is in a connected state. Using carrier will not work with the next patch
in this series, which aims to turn the carrier temporarily off if the guest
doesn't seem to be able to receive packets.
Signed-off-by: Zoltan Kiss <zoltan.kiss@citrix.com>
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Cc: netdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: xen-devel@lists.xenproject.org
v2:
- rename the bitshift type to "enum state_bit_shift" here, not in the next patch
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/xen-netback/common.h b/drivers/net/xen-netback/common.h
index 28c9822..4a92fc1 100644
--- a/drivers/net/xen-netback/common.h
+++ b/drivers/net/xen-netback/common.h
@@ -198,6 +198,11 @@
struct xenvif_stats stats;
};
+enum state_bit_shift {
+ /* This bit marks that the vif is connected */
+ VIF_STATUS_CONNECTED
+};
+
struct xenvif {
/* Unique identifier for this interface. */
domid_t domid;
@@ -220,6 +225,7 @@
* frontend is rogue.
*/
bool disabled;
+ unsigned long status;
/* Queues */
struct xenvif_queue *queues;
diff --git a/drivers/net/xen-netback/interface.c b/drivers/net/xen-netback/interface.c
index bd59d9d..fbdadb3 100644
--- a/drivers/net/xen-netback/interface.c
+++ b/drivers/net/xen-netback/interface.c
@@ -55,7 +55,8 @@
int xenvif_schedulable(struct xenvif *vif)
{
- return netif_running(vif->dev) && netif_carrier_ok(vif->dev);
+ return netif_running(vif->dev) &&
+ test_bit(VIF_STATUS_CONNECTED, &vif->status);
}
static irqreturn_t xenvif_tx_interrupt(int irq, void *dev_id)
@@ -267,7 +268,7 @@
static int xenvif_open(struct net_device *dev)
{
struct xenvif *vif = netdev_priv(dev);
- if (netif_carrier_ok(dev))
+ if (test_bit(VIF_STATUS_CONNECTED, &vif->status))
xenvif_up(vif);
netif_tx_start_all_queues(dev);
return 0;
@@ -276,7 +277,7 @@
static int xenvif_close(struct net_device *dev)
{
struct xenvif *vif = netdev_priv(dev);
- if (netif_carrier_ok(dev))
+ if (test_bit(VIF_STATUS_CONNECTED, &vif->status))
xenvif_down(vif);
netif_tx_stop_all_queues(dev);
return 0;
@@ -528,6 +529,7 @@
if (!vif->can_sg && vif->dev->mtu > ETH_DATA_LEN)
dev_set_mtu(vif->dev, ETH_DATA_LEN);
netdev_update_features(vif->dev);
+ set_bit(VIF_STATUS_CONNECTED, &vif->status);
netif_carrier_on(vif->dev);
if (netif_running(vif->dev))
xenvif_up(vif);
@@ -625,9 +627,11 @@
struct net_device *dev = vif->dev;
rtnl_lock();
- netif_carrier_off(dev); /* discard queued packets */
- if (netif_running(dev))
- xenvif_down(vif);
+ if (test_and_clear_bit(VIF_STATUS_CONNECTED, &vif->status)) {
+ netif_carrier_off(dev); /* discard queued packets */
+ if (netif_running(dev))
+ xenvif_down(vif);
+ }
rtnl_unlock();
}
@@ -656,8 +660,7 @@
unsigned int num_queues = vif->num_queues;
unsigned int queue_index;
- if (netif_carrier_ok(vif->dev))
- xenvif_carrier_off(vif);
+ xenvif_carrier_off(vif);
for (queue_index = 0; queue_index < num_queues; ++queue_index) {
queue = &vif->queues[queue_index];
diff --git a/drivers/net/xen-netback/netback.c b/drivers/net/xen-netback/netback.c
index 769e553..6c4cc0f 100644
--- a/drivers/net/xen-netback/netback.c
+++ b/drivers/net/xen-netback/netback.c
@@ -1953,7 +1953,7 @@
* context so we defer it here, if this thread is
* associated with queue 0.
*/
- if (unlikely(queue->vif->disabled && netif_carrier_ok(queue->vif->dev) && queue->id == 0))
+ if (unlikely(queue->vif->disabled && queue->id == 0))
xenvif_carrier_off(queue->vif);
if (kthread_should_stop())