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xen/netfront: stop tx queues during live migration

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The tx queues are not stopped during the live migration. As a result, the
ndo_start_xmit() may access netfront_info->queues which is freed by
talk_to_netback()->xennet_destroy_queues().

This patch is to netif_device_detach() at the beginning of xen-netfront
resuming, and netif_device_attach() at the end of resuming.

     CPU A                                CPU B

 talk_to_netback()
 -> if (info->queues)
        xennet_destroy_queues(info);
    to free netfront_info->queues

                                        xennet_start_xmit()
                                        to access netfront_info->queues

  -> err = xennet_create_queues(info, &num_queues);

The idea is borrowed from virtio-net.

Cc: Joe Jin <joe.jin@oracle.com>
Signed-off-by: Dongli Zhang <dongli.zhang@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Dongli Zhang 2021-10-22 16:31:39 -07:00 committed by David S. Miller
parent 0c57eeecc5
commit 042b2046d0
1 changed files with 8 additions and 0 deletions
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8
drivers/net/xen-netfront.c
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@ -1730,6 +1730,10 @@ static int netfront_resume(struct xenbus_device *dev)
dev_dbg(&dev->dev, "%s\n", dev->nodename);
netif_tx_lock_bh(info->netdev);
netif_device_detach(info->netdev);
netif_tx_unlock_bh(info->netdev);
xennet_disconnect_backend(info);
return 0;
}
@ -2349,6 +2353,10 @@ static int xennet_connect(struct net_device *dev)
* domain a kick because we've probably just requeued some
* packets.
*/
netif_tx_lock_bh(np->netdev);
netif_device_attach(np->netdev);
netif_tx_unlock_bh(np->netdev);
netif_carrier_on(np->netdev);
for (j = 0; j < num_queues; ++j) {
queue = &np->queues[j];