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, 1 insertions, 0 deletions

diff --git a/drivers/net/xen-netback/interface.c b/drivers/net/xen-netback/interface.c
index d2ada7cda97a..1a83e190fc15 100644
--- a/drivers/net/xen-netback/interface.c
+++ b/drivers/net/xen-netback/interface.c
@@ -463,6 +463,7 @@ int xenvif_init_queue(struct xenvif_queue *queue)
         queue->credit_bytes = queue->remaining_credit = ~0UL;
         queue->credit_usec  = 0UL;
         init_timer(&queue->credit_timeout);
+        queue->credit_timeout.function = xenvif_tx_credit_callback;
         queue->credit_window_start = get_jiffies_64();
 
         queue->rx_queue_max = XENVIF_RX_QUEUE_BYTES;