Xen devel - Jan 2013 - [PATCH] Add support for netconsole driver used on bridge device with, VIF attached

When starting a VM which has virtual interface attached to the same 
bridge (i.e vif = [type=netfront,bridge=xenbr0''] in vm.cfg) which is 
used for netconsole the
following message appears (after about 60 seconds) and VM creation 
operation fails.
      Error: Device 0 (vif) could not be connected. Hotplug scripts not 
working.

Note:
When trying to do the opposite, i.e. first create VM and then run
netconsole we got the error #524 - vif2.0 doesn''t support polling,
aborting.

The following patch (to latest kernel) fix this bug by adding 
implementation to ndo_poll_controller.

0001-Add-support-for-netconsole-driver-used-on-bridge-dev.patch
0 2001
From: Yuval <yuval.shaia@oracle.com>
Date: Tue, 8 Jan 2013 10:08:45 +0200
Subject: [PATCH] Add support for netconsole driver used on bridge device 
with
  VIF attached

Signed-off-by: Yuval <yuval.shaia@oracle.com>
---
  drivers/net/xen-netback/interface.c |    8 ++++++++
  1 file changed, 8 insertions(+)

diff --git a/drivers/net/xen-netback/interface.c 
b/drivers/net/xen-netback/interface.c
index 601ae2a..10751f5 100644
--- a/drivers/net/xen-netback/interface.c
+++ b/drivers/net/xen-netback/interface.c
@@ -179,6 +179,13 @@ static u32 xenvif_fix_features(struct net_device 
*dev, u32 features)
      return features;
  }

+static void xenvif_poll_controller(struct net_device *dev)
+{
+    disable_irq(dev->irq);
+    xenvif_interrupt(dev->irq, dev);
+    enable_irq(dev->irq);
+}
+
  static const struct xenvif_stat {
      char name[ETH_GSTRING_LEN];
      u16 offset;
@@ -237,6 +244,7 @@ static const struct net_device_ops xenvif_netdev_ops = {
      .ndo_stop    = xenvif_close,
      .ndo_change_mtu    = xenvif_change_mtu,
      .ndo_fix_features = xenvif_fix_features,
+    .ndo_poll_controller = xenvif_poll_controller,
  };

  struct xenvif *xenvif_alloc(struct device *parent, domid_t domid,
-- 
1.7.9.5

On Mon, 2013-01-21 at 16:34 +0000, yuval.shaia@oracle.com
wrote:
> When starting a VM which has virtual interface attached to the same 
> bridge (i.e vif = [type=netfront,bridge=xenbr0''] in vm.cfg) which
is
> used for netconsole the
> following message appears (after about 60 seconds) and VM creation 
> operation fails.
>       Error: Device 0 (vif) could not be connected. Hotplug scripts not 
> working.
I''m not sure how this can relate netconsole since this happens before
the guest even runs, doesn''t it?
> Note:
> When trying to do the opposite, i.e. first create VM and then run
> netconsole we got the error #524 - vif2.0 doesn''t support polling,
> aborting.
> 
> The following patch (to latest kernel) fix this bug by adding 
> implementation to ndo_poll_controller.
Surely this is needed in netfront not netback?

BT, you patch is whitespace damanged, please see
Documentation/SubmittingPatches and Documentation/email-clients.txt for
tips. Please also run checkpatch.pl.

Ian.
> 00
> 01-Add-support-for-netconsole-driver-used-on-bridge-dev.patch
> 0 2001
> From: Yuval <yuval.shaia@oracle.com>
> Date: Tue, 8 Jan 2013 10:08:45 +0200
> Subject: [PATCH] Add support for netconsole driver used on bridge device 
> with
>   VIF attached
> 
> Signed-off-by: Yuval <yuval.shaia@oracle.com>
> ---
>   drivers/net/xen-netback/interface.c |    8 ++++++++
>   1 file changed, 8 insertions(+)
> 
> diff --git a/drivers/net/xen-netback/interface.c 
> b/drivers/net/xen-netback/interface.c
> index 601ae2a..10751f5 100644
> --- a/drivers/net/xen-netback/interface.c
> +++ b/drivers/net/xen-netback/interface.c
> @@ -179,6 +179,13 @@ static u32 xenvif_fix_features(struct net_device 
> *dev, u32 features)
>       return features;
>   }
> 
> +static void xenvif_poll_controller(struct net_device *dev)
> +{
> +    disable_irq(dev->irq);
> +    xenvif_interrupt(dev->irq, dev);
> +    enable_irq(dev->irq);
> +}
> +
>   static const struct xenvif_stat {
>       char name[ETH_GSTRING_LEN];
>       u16 offset;
> @@ -237,6 +244,7 @@ static const struct net_device_ops xenvif_netdev_ops =
{
>       .ndo_stop    = xenvif_close,
>       .ndo_change_mtu    = xenvif_change_mtu,
>       .ndo_fix_features = xenvif_fix_features,
> +    .ndo_poll_controller = xenvif_poll_controller,
>   };
> 
>   struct xenvif *xenvif_alloc(struct device *parent, domid_t domid,