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

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Message-ID: <871ug9yls5.fsf@rustcorp.com.au>
Date:	Mon, 05 Nov 2012 10:16:02 +1030
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Jason Wang <jasowang@...hat.com>, mst@...hat.com,
	davem@...emloft.net, virtualization@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	krkumar2@...ibm.com
Cc:	kvm@...r.kernel.org, Jason Wang <jasowang@...hat.com>
Subject: Re: [rfc net-next v6 3/3] virtio-net: change the number of queues through ethtool

Jason Wang <jasowang@...hat.com> 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.
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