[libvirt] [Xen-devel] Setting devid for emulated NICs (Xen 4.3.1 / libvirt 1.2.0) using libxl driver
Stefan Bader
stefan.bader at canonical.com
Wed Dec 18 13:12:46 UTC 2013
On 18.12.2013 13:27, Ian Campbell wrote:
> On Tue, 2013-12-17 at 18:32 +0100, Stefan Bader wrote:
>>>
>>> Might this libxl fix be relevant:
>>> commit 5420f26507fc5c9853eb1076401a8658d72669da
>>> Author: Jim Fehlig <jfehlig at suse.com>
>>> Date: Fri Jan 11 12:22:26 2013 +0000
>>>
>>> libxl: Set vfb and vkb devid if not done so by the caller
>>>
>>> Other devices set a sensible devid if the caller has not done so.
>>> Do the same for vfb and vkb. While at it, factor out the common code
>>> used to determine a sensible devid, so it can be used by other
>>> libxl__device_*_add functions.
>>>
>>> Signed-off-by: Jim Fehlig <jfehlig at suse.com>
>>> Acked-by: Ian Campbell <ian.campbell at citrix.com>
>>> Committed-by: Ian Campbell <ian.campbell at citrix.com>
>>>
>>> and a follow up in dfeccbeaa. Although the comment implies that nic's
>>> were already correctly assigning a devid if the caller specified -1, so
>>> I don't know why it doesn't work for you :-(
>>
>> Ok, yes, the commit above indeed changes libxl__device_nic_add to call
>> libxl__device_nextid for the devid... Just how is this actually called.
>> Maybe not sufficient but "git grep libxl__device_nic_add" in the xen code only
>> shows the definition and a declaration in libxl_internal.h to me...
>
> I have a feeling a macro might be involved...
>
> Here we go, look for DEFINE_DEVICE_REMOVE in libxl.c. We should really
> add the eventual function names in comments to provide grep fodder....
Oh duh, yeah. So in DEFINE_DEVICE_ADD a libxl_device_nic_add is created which
calls to libxl__device_nic_add. When I look for the single _ version I find a
call from xl_cmdimpl.c and its public declaration in libxl.h.
So I guess the bug is that libvirt in the libxl driver never seems to do so. Ok,
thanks a lot for digging the out the DEFINE. As nice those are to create similar
functions from template, grep and tags fail to be helpful with them.
-Stefan
>
> Ian.
>
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