# Re: \[PATCH 07/22\] RDMA/irdma: Register an auxiliary driver and implement private channel OPs

- From: Leon Romanovsky \<leon@kernel.org\>
- Date: 2021-01-28 05:42:19 
- List: netdev
- Page: https://ratatoskr.run/netdev/2021/01/11194687
- Thread: https://ratatoskr.run/linux-rdma/2021/01/11194037/t.md

```text
On Wed, Jan 27, 2021 at 07:16:41PM -0400, Jason Gunthorpe wrote:
> On Wed, Jan 27, 2021 at 10:17:56PM +0000, Saleem, Shiraz wrote:
>
> > Even with another core PCI driver, there still needs to be private
> > communication channel between the aux rdma driver and this PCI
> > driver to pass things like QoS updates.
>
> Data pushed from the core driver to its aux drivers should either be
> done through new callbacks in a struct device_driver or by having a
> notifier chain scheme from the core driver.

Right, and internal to driver/core device_lock will protect from
parallel probe/remove and PCI flows.

I would say that all this handmade register/unregister and peer_client
dance will be gone if driver would use properly auxbus.

Thanks

>
> Jason
```