linux-kernel - Re: [rfc net-next v6 2/3] virtio

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Date:	Mon, 19 Nov 2012 14:18:24 +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 2/3] virtio_net: multiqueue support

On 11/05/2012 07:16 AM, Rusty Russell wrote:
> Jason Wang <jasowang@...hat.com> writes:
>> This addes multiqueue support to virtio_net driver. There's two mode supported:
>> single queue pair mode and multiple queue pairs mode. An obvious
>> difference compared with a physical mq card is that virtio-net reserve
>> first two virtqueues when it is working in multiqueue mode, this is
>> used for implementing adaptive mode switching in the future. The
>> virtqueues that were in both mq and sq mode were initialized and only
>> one queue pair (single queue mode) were used at default. User could
>> use ethtool -L to switch to multiqueue mode withe the next patch.
> Hi Jason,
>
>          This first patch looks good, but conflates three things
> together:
> (1) Separate per-queue structures from struct virtnet_info to allow
>      multiple queues.  This is the mechanical part of the patch.
> (2) An annotation bugfix, see below.
> (3) Enabling mq using a new feature and negotiation.

Hi Rusty:

Sorry for the late response, just back from vacation.

For 1 and 3, I will split the patch as you suggested.
For 2, will fix it.

Thanks
>
>> @@ -700,7 +767,8 @@ static struct rtnl_link_stats64 *virtnet_stats(struct net_device *dev,
>>   	unsigned int start;
>>   
>>   	for_each_possible_cpu(cpu) {
>> -		struct virtnet_stats *stats = per_cpu_ptr(vi->stats, cpu);
>> +		struct virtnet_stats __percpu *stats
>> +			= per_cpu_ptr(vi->stats, cpu);
>>   		u64 tpackets, tbytes, rpackets, rbytes;
>>   
>>   		do {
> Cheers,
> Rusty.
> --
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