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| author | David Vrabel <david.vrabel@citrix.com> | 2011-09-30 06:37:51 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-11-11 09:36:29 -0800 |
| commit | a00fb1451d630898c1380349ac3776688e58010f (patch) | |
| tree | b1cc528a57283e8693f3b000e6c8a4922af6d8ba | |
| parent | 62d8d0b9b6c459789876335156c56110042f2158 (diff) | |
| download | lwn-a00fb1451d630898c1380349ac3776688e58010f.tar.gz lwn-a00fb1451d630898c1380349ac3776688e58010f.zip | |
net: xen-netback: correctly restart Tx after a VM restore/migrate
[ Upstream commit d0e5d83284dac15c015bb48115b6780f5a6413cd ]
If a VM is saved and restored (or migrated) the netback driver will no
longer process any Tx packets from the frontend. xenvif_up() does not
schedule the processing of any pending Tx requests from the front end
because the carrier is off. Without this initial kick the frontend
just adds Tx requests to the ring without raising an event (until the
ring is full).
This was caused by 47103041e91794acdbc6165da0ae288d844c820b (net:
xen-netback: convert to hw_features) which reordered the calls to
xenvif_up() and netif_carrier_on() in xenvif_connect().
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Cc: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | drivers/net/xen-netback/interface.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/net/xen-netback/interface.c b/drivers/net/xen-netback/interface.c index 0ca86f9ec4ed..182562952c79 100644 --- a/drivers/net/xen-netback/interface.c +++ b/drivers/net/xen-netback/interface.c @@ -327,12 +327,12 @@ int xenvif_connect(struct xenvif *vif, unsigned long tx_ring_ref, xenvif_get(vif); rtnl_lock(); - if (netif_running(vif->dev)) - xenvif_up(vif); if (!vif->can_sg && vif->dev->mtu > ETH_DATA_LEN) dev_set_mtu(vif->dev, ETH_DATA_LEN); netdev_update_features(vif->dev); netif_carrier_on(vif->dev); + if (netif_running(vif->dev)) + xenvif_up(vif); rtnl_unlock(); return 0; |