Subject: Re: [rfc net-next v6 3/3] virtio-net: change the number of queues through ethtool

From: Rusty Russell <[email-masked]>
Date: Mon, 05 Nov 2012 10:16:02 +1030

Jason Wang <[email-masked]> writes:
> This patch implement the {set|get}_channels method of ethool to allow user to
> change the number of queues dymaically when the device is running. This would
> let the user to tune the device for specific applications.
...
> +	/* Only two modes were support currently */
> +	if (queue_pairs == 0)
> +		return -EINVAL;
> +	if (queue_pairs != vi->total_queue_pairs - 1 && queue_pairs != 1)
> +		return -EINVAL;

OK, so you let them do all or nothing, but this three-way test is
pretty unclear.

In fact, the whole total_queue_pairs/num_queue_pairs thing is weird (and
uncommented).  I think for "total" you mean "max"; the maximum possible
queue pair number.

Let me go back and review the previous patch again...

Cheers,
Rusty.