Re: [PATCH mlx5-next v1 05/11] net/mlx5: Register mlx5 devices to auxiliary virtual bus

On Thu, Nov 05, 2020 at 12:59:20PM -0800, Saeed Mahameed wrote:

2. you can always load a driver without its underlying device existed.

for example, you can load a pci device driver/module and it will load and wait for pci devices to pop up, the subsysetem infrastructure will match between drivers and devices and probe them.

Yes, this works fine with this design

struct aux_driver mlx5_vpda_aux_driver {

  .name = "vdpa",
   /* match this driver with mlx5_core devices */
  .id_table = {"mlx5_core"}, 
  .ops {
        /* called before probe on actual aux mlx5_core device */
       .is_supported(struct aux_device); 

This means module auto loading is impossible, we can't tell to load the module until we load the module to call the is_supported code ..

Jason