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

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Message-ID: <50A9D030.7070100@redhat.com>
Date:	Mon, 19 Nov 2012 14:22:40 +0800
From:	Jason Wang <jasowang@...hat.com>
To:	Rusty Russell <rusty@...tcorp.com.au>
CC:	mst@...hat.com, davem@...emloft.net,
	virtualization@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	krkumar2@...ibm.com, kvm@...r.kernel.org
Subject: Re: [rfc net-next v6 3/3] virtio-net: change the number of queues
 through ethtool

On 11/05/2012 07:46 AM, Rusty Russell wrote:
> 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.

True, looks like the first check could be removed.
>
> 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.

Yes, "total" means "max", will add a comment or change the name to 
max_queue_pairs/current_queue_pairs.
>
> Let me go back and review the previous patch again...
>
> Cheers,
> Rusty.
> --
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