Re: [PATCH 5/9] libxl: prevent attaching multiple netdevs with the same MAC

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Marek Marczykowski-Górecki wrote:
> It will not be possible to detach such device later. Also improve
> logging in such cases.
>
> Signed-off-by: Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>
> ---
>  src/libxl/libxl_driver.c | 15 +++++++++++++++
>  1 file changed, 15 insertions(+)
>
> Changes in v4:
>  - use virDomainHasNet instead of virDomainNetFindIdx
>
> diff --git a/src/libxl/libxl_driver.c b/src/libxl/libxl_driver.c
> index ce3a99b..1313d2e 100644
> --- a/src/libxl/libxl_driver.c
> +++ b/src/libxl/libxl_driver.c
> @@ -2787,6 +2787,7 @@ libxlDomainAttachNetDevice(libxlDriverPrivatePtr driver,
>      int actualType;
>      libxl_device_nic nic;
>      int ret = -1;
> +    char mac[VIR_MAC_STRING_BUFLEN];
>  
>      /* preallocate new slot for device */
>      if (VIR_REALLOC_N(vm->def->nets, vm->def->nnets + 1) < 0)
> @@ -2801,6 +2802,13 @@ libxlDomainAttachNetDevice(libxlDriverPrivatePtr driver,
>  
>      actualType = virDomainNetGetActualType(net);
>  
> +    if (virDomainHasNet(vm->def, net)) {
> +        virReportError(VIR_ERR_OPERATION_FAILED,
> +                _("device matching mac address %s already exists"),
>   
> + virMacAddrFormat(&net->mac, mac));

I think the error should be VIR_ERR_INVALID_ARG, like you've done in the
last hunk below.  I'll change that, and use the same text in both error
reports, before pushing.  Otherwise, ACK.

Regards,
Jim

> +        return -1;
> +    }
> +
>      if (actualType == VIR_DOMAIN_NET_TYPE_HOSTDEV) {
>          /* This is really a "smart hostdev", so it should be attached
>           * as a hostdev (the hostdev code will reach over into the
> @@ -2879,6 +2887,7 @@ libxlDomainAttachDeviceConfig(virDomainDefPtr vmdef, virDomainDeviceDefPtr dev)
>      virDomainHostdevDefPtr hostdev;
>      virDomainHostdevDefPtr found;
>      virDomainHostdevSubsysPCIPtr pcisrc;
> +    char mac[VIR_MAC_STRING_BUFLEN];
>  
>      switch (dev->type) {
>          case VIR_DOMAIN_DEVICE_DISK:
> @@ -2896,6 +2905,12 @@ libxlDomainAttachDeviceConfig(virDomainDefPtr vmdef, virDomainDeviceDefPtr dev)
>  
>          case VIR_DOMAIN_DEVICE_NET:
>              net = dev->data.net;
> +            if (virDomainHasNet(vmdef, net)) {
> +                virReportError(VIR_ERR_INVALID_ARG,
> +                               _("network device with mac %s already exists."),
> +                               virMacAddrFormat(&net->mac, mac));
> +                return -1;
> +            }
>              if (virDomainNetInsert(vmdef, net))
>                  return -1;
>              dev->data.net = NULL;
>   

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