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authorchas williams <3chas3@gmail.com>2015-09-16 16:28:25 -0400
committerDavid S. Miller <davem@davemloft.net>2015-09-20 21:39:21 -0700
commit812494d9a0cacf77e0a538be18183c7b471812aa (patch)
tree03c55647d64b259b499bacec9c63922526f82d7a /drivers/net/xen-netfront.c
parent47bbbb30b4331ec58a74a66a044341f0114b02b3 (diff)
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>
Diffstat (limited to 'drivers/net/xen-netfront.c')
-rw-r--r--drivers/net/xen-netfront.c17
1 files changed, 10 insertions, 7 deletions
diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c
index f821a97d7827..9bf63c27a9b7 100644
--- a/drivers/net/xen-netfront.c
+++ b/drivers/net/xen-netfront.c
@@ -1819,19 +1819,22 @@ again:
goto destroy_ring;
}
- if (num_queues == 1) {
- err = write_queue_xenstore_keys(&info->queues[0], &xbt, 0); /* flat */
- if (err)
- goto abort_transaction_no_dev_fatal;
- } else {
+ if (xenbus_exists(XBT_NIL,
+ info->xbdev->otherend, "multi-queue-max-queues")) {
/* Write the number of queues */
- err = xenbus_printf(xbt, dev->nodename, "multi-queue-num-queues",
- "%u", num_queues);
+ err = xenbus_printf(xbt, dev->nodename,
+ "multi-queue-num-queues", "%u", num_queues);
if (err) {
message = "writing multi-queue-num-queues";
goto abort_transaction_no_dev_fatal;
}
+ }
+ if (num_queues == 1) {
+ err = write_queue_xenstore_keys(&info->queues[0], &xbt, 0); /* flat */
+ if (err)
+ goto abort_transaction_no_dev_fatal;
+ } else {
/* Write the keys for each queue */
for (i = 0; i < num_queues; ++i) {
queue = &info->queues[i];