RE: [PATCH V3 5/6] vDPA: answer num of queue pairs = 1 to userspace when VIRTIO_NET_F_MQ == 0

[Parav Pandit via Virtualization]

> From: Zhu, Lingshan <lingshan....@intel.com>
> Sent: Tuesday, July 12, 2022 11:46 PM
> > When the user space which invokes netlink commands, detects that _MQ
> is not supported, hence it takes max_queue_pair = 1 by itself.
> I think the kernel module have all necessary information and it is the only
> one which have precise information of a device, so it should answer precisely
> than let the user space guess. The kernel module should be reliable than stay
> silent, leave the question to the user space tool.
Kernel is reliable. It doesn’t expose a config space field if the field doesn’t 
exist regardless of field should have default or no default.
User space should not guess either. User space gets to see if _MQ present/not 
present. If _MQ present than get reliable data from kernel.
If _MQ not present, it means this device has one VQ pair.
_______________________________________________
Virtualization mailing list
Virtualization@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/virtualization