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xen-netback: making the bandwidth limiter runtime settable

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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>
This commit is contained in:
Palik, Imre
2015-03-19 11:05:42 +01:00
committed by David S. Miller
parent 750f2f9165
commit edafc132ba
4 changed files with 63 additions and 3 deletions
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1
drivers/net/xen-netback/interface.c
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@@ -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;