xen-netfront: always set num queues if possible
If netfront connects with two (or more) queues and then reconnects with only one queue it fails to delete or rewrite the multi-queue-num-queues key and netback will try to use the wrong number of queues. Always write the num-queues field if the backend has multi-queue support. Signed-off-by: Chas Williams <3chas3@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -1819,19 +1819,22 @@ static int talk_to_netback(struct xenbus_device *dev,
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goto destroy_ring;
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}
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if (xenbus_exists(XBT_NIL,
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info->xbdev->otherend, "multi-queue-max-queues")) {
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/* Write the number of queues */
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err = xenbus_printf(xbt, dev->nodename,
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"multi-queue-num-queues", "%u", num_queues);
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if (err) {
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message = "writing multi-queue-num-queues";
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goto abort_transaction_no_dev_fatal;
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}
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}
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if (num_queues == 1) {
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err = write_queue_xenstore_keys(&info->queues[0], &xbt, 0); /* flat */
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if (err)
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goto abort_transaction_no_dev_fatal;
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} else {
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/* Write the number of queues */
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err = xenbus_printf(xbt, dev->nodename, "multi-queue-num-queues",
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"%u", num_queues);
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if (err) {
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message = "writing multi-queue-num-queues";
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goto abort_transaction_no_dev_fatal;
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}
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/* Write the keys for each queue */
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for (i = 0; i < num_queues; ++i) {
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queue = &info->queues[i];
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