Re: Finding the namespace of a struct ib_device

[Ka-Cheong Poon <ka-cheong.poon@oracle.com>]

On 9/4/20 1:39 AM, Jason Gunthorpe wrote:
> On Thu, Sep 03, 2020 at 10:02:01PM +0800, Ka-Cheong Poon wrote:
>> When a struct ib_client's add() function is called. is there a
>> supported method to find out the namespace of the passed in
>> struct ib_device?  There is rdma_dev_access_netns() but it does
>> not return the namespace.  It seems that it needs to have
>> something like the following.
>>
>> struct net *rdma_dev_to_netns(struct ib_device *ib_dev)
>> {
>>         return read_pnet(&ib_dev->coredev.rdma_net);
>> }
>>
>> Comments?
> 
> I suppose, but why would something need this?


If the client needs to allocate stuff for the namespace
related to that device, it needs to know the namespace of
that device.  Then when that namespace is deleted, the
client can clean up those related stuff as the client's
namespace exit function can be called before the remove()
function is triggered in rdma_dev_exit_net().  Without
knowing the namespace of that device, coordination cannot
be done.




-- 
K. Poon
ka-cheong.poon@oracle.com