xen-netback: making the bandwidth limiter runtime settable

With the current netback, the bandwidth limiter's parameters are only
settable during vif setup time.  This patch register a watch on them, and
thus makes them runtime changeable.

When the watch fires, the timer is reset.  The timer's mutex is used for
fencing the change.

Cc: Anthony Liguori <aliguori@amazon.com>
Signed-off-by: Imre Palik <imrep@amazon.de>
Acked-by: Wei Liu <wei.liu2@citrix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/net/xen-netback/common.h b/drivers/net/xen-netback/common.h
index 589fa256256b..8a495b318b6f 100644
--- a/drivers/net/xen-netback/common.h
+++ b/drivers/net/xen-netback/common.h
@@ -238,6 +238,8 @@ struct xenvif {
         unsigned int num_queues; /* active queues, resource allocated */
         unsigned int stalled_queues;
 
+        struct xenbus_watch credit_watch;
+
         spinlock_t lock;
 
 #ifdef CONFIG_DEBUG_FS
@@ -260,6 +262,8 @@ static inline struct xenbus_device *xenvif_to_xenbus_device(struct xenvif *vif)
         return to_xenbus_device(vif->dev->dev.parent);
 }
 
+void xenvif_tx_credit_callback(unsigned long data);
+
 struct xenvif *xenvif_alloc(struct device *parent,
                             domid_t domid,
                             unsigned int handle);