Re: [PATCH v2 18/24] vhost-net: vhost-user: update vhost_net_virtqueue_stop()

[Kangjie Xu <kangjie.xu@linux.alibaba.com>]

在 2022/8/24 12:05, Jason Wang 写道:
>
> 在 2022/8/16 09:06, Kangjie Xu 写道:
>> Update vhost_net_virtqueue_stop() for vhost-user scenario.
>
>
> Let's explain why it is needed now or why it doesn't cause any issue 
> or it's a bug fix or not.
>
> Thanks
>
This patch is to suppport vq reset for vhost-user.

We need this simply because the behavior of vhost_ops->get_vq_index() is 
different in vhost-user and vhost-kernel.

vhost_user_get_vq_index(dev, idx) simply returns "idx".

vhost_kernel_get_vq_index(dev, idx) returns "idx - dev->vq_index".

Thanks

>
>>
>> Signed-off-by: Kangjie Xu <kangjie.xu@linux.alibaba.com>
>> Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
>> ---
>>   hw/net/vhost_net.c | 4 ++++
>>   1 file changed, 4 insertions(+)
>>
>> diff --git a/hw/net/vhost_net.c b/hw/net/vhost_net.c
>> index 2ab67e875e..c0d408f3b4 100644
>> --- a/hw/net/vhost_net.c
>> +++ b/hw/net/vhost_net.c
>> @@ -533,6 +533,10 @@ void vhost_net_virtqueue_stop(VirtIODevice 
>> *vdev, NetClientState *nc,
>>           assert(r >= 0);
>>       }
>>   +    if (net->nc->info->type == NET_CLIENT_DRIVER_VHOST_USER) {
>> +        idx = idx - net->dev.vq_index;
>> +    }
>> +
>>       vhost_dev_virtqueue_stop(&net->dev, vdev, idx);
>>   }