Re: [PATCH net-next v18 07/14] memory-provider: dmabuf devmem memory provider

On Tue, 13 Aug 2024 03:31:13 +0100 Pavel Begunkov wrote:

I'm getting lost, so repeating myself a bit. What I think
would be a good approach is if we get an error back from
the driver if it doesn't support netiov / providers.

netdev_rx_queue_restart() {
	...
	err = dev->queue_mgmt_ops->ndo_queue_mem_alloc();
	if (err == -EOPNOTSUPP) // the driver doesn't support netiov
		return -EOPNOTSUPP;
	...
}

That can be done if drivers opt in to support providers,
e.g. via a page pool flag.

What I think wouldn't be a great option is getting back a
"success" from the driver even though it ignored

page pool params are not the right place for a supported flag.
Sooner or later we'll want to expose this flag to user space.