On Fri, Oct 02, 2020 at 11:27:43AM +0000, Parav Pandit wrote: > > > > From: Leon Romanovsky <leon@xxxxxxxxxx> > > Sent: Friday, October 2, 2020 4:44 PM > > [..] > > > > ../../../devices/pci0000:00/0000:00:0b.0/mlx5_core.eth.2 > > > This gives you the ability to not load the netdevice and rdma device of a VF > > and only load the vdpa device. > > > These are real use case that users have asked for. > > > In use case one, they are only interested in rdma device. > > > In second use case only vdpa device. > > > How shall one achieve that without spinning of the device for each class? > > > > Why will it be different if ancillary device is small PCI core? > > If you want RDMA, you will use specific ancillary driver that connects to that > > small PCI logic. > > I didn't follow, wwhat is PCI core and PCI logic in this context? mlx5_core is PCI core/logic - ancillary device mlx5_ib/mlx5_en/mlx5_vdpa - ancillary drivers > > Not sure if you understood the use case. > Let me try again. > Let say there are 4 VFs enabled. > User would not like to create netdev for 3 VFs (0 to 2) ; user only wants rdma device for these VFs 0 to 2. > User wants only vdpa device for 4th VF. > User doesn't want to create rdma device and netdevice for the 4th VF. > How one shall achieve this? It depends on how N-to-1 bus will be implemented. For example, devlink already allows to disable RoCE on specific function, nothing prohibits to extend it to support other classes. > It is easily achievable with current ancillary device instantiation per class proposal. It is byproduct of 1-to-1 connection and not specific design decision. > > > Being nice to the users and provide clean abstraction are important goals too. > Which part of this makes not_nice_to_users and what is not abstracted. > I lost you. Your use case perfectly presented not_nice_to_users thing. Users are interested to work on functions (VF/PF/SF) and configure them without need to dig into the sysfs directories to connect ancillary classes and their indexes to the real functions. Thanks
