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Re: [PATCH v2 1/3] virtio: add ability to delete vq through a pointer


From: Pan Nengyuan
Subject: Re: [PATCH v2 1/3] virtio: add ability to delete vq through a pointer
Date: Thu, 5 Dec 2019 10:30:31 +0800
User-agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.2.2


On 2019/12/4 16:33, Pankaj Gupta wrote:
> 
>> From: Pan Nengyuan <address@hidden>
>>
>> Devices tend to maintain vq pointers, allow deleting them trough a vq
>> pointer.
>>
>> Signed-off-by: Michael S. Tsirkin <address@hidden>
>> Signed-off-by: Pan Nengyuan <address@hidden>
>> ---
>> Changes v2 to v1:
>> - add a new function virtio_delete_queue to cleanup vq through a vq pointer
>> ---
>>  hw/virtio/virtio.c         | 16 +++++++++++-----
>>  include/hw/virtio/virtio.h |  2 ++
>>  2 files changed, 13 insertions(+), 5 deletions(-)
>>
>> diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c
>> index 04716b5..6de3cfd 100644
>> --- a/hw/virtio/virtio.c
>> +++ b/hw/virtio/virtio.c
>> @@ -2330,17 +2330,23 @@ VirtQueue *virtio_add_queue(VirtIODevice *vdev, int
>> queue_size,
>>      return &vdev->vq[i];
>>  }
>>  
>> +void virtio_delete_queue(VirtQueue *vq)
>> +{
>> +    vq->vring.num = 0;
>> +    vq->vring.num_default = 0;
>> +    vq->handle_output = NULL;
>> +    vq->handle_aio_output = NULL;
>> +    g_free(vq->used_elems);
>> +    vq->used_elems = NULL;
>> +}
>> +
>>  void virtio_del_queue(VirtIODevice *vdev, int n)
>>  {
>>      if (n < 0 || n >= VIRTIO_QUEUE_MAX) {
>>          abort();
>>      }
>>  
>> -    vdev->vq[n].vring.num = 0;
>> -    vdev->vq[n].vring.num_default = 0;
>> -    vdev->vq[n].handle_output = NULL;
>> -    vdev->vq[n].handle_aio_output = NULL;
>> -    g_free(vdev->vq[n].used_elems);
>> +    virtio_delete_queue(&vdev->vq[n]);
>>  }
>>  
>>  static void virtio_set_isr(VirtIODevice *vdev, int value)
>> diff --git a/include/hw/virtio/virtio.h b/include/hw/virtio/virtio.h
>> index c32a815..e18756d 100644
>> --- a/include/hw/virtio/virtio.h
>> +++ b/include/hw/virtio/virtio.h
>> @@ -183,6 +183,8 @@ VirtQueue *virtio_add_queue(VirtIODevice *vdev, int
>> queue_size,
>>  
>>  void virtio_del_queue(VirtIODevice *vdev, int n);
>>  
>> +void virtio_delete_queue(VirtQueue *vq);
>> +
>>  void virtqueue_push(VirtQueue *vq, const VirtQueueElement *elem,
>>                      unsigned int len);
>>  void virtqueue_flush(VirtQueue *vq, unsigned int count);
>> --
>> 2.7.2.windows.1
>>
>>
> Overall it ooks good to me.
> 
> Just one point: e.g in virtio_rng: "virtio_rng_device_unrealize" function
> We are doing :     virtio_del_queue(vdev, 0);
> 
> One can directly call "virtio_delete_queue". It can become confusing
> to call multiple functions for same purpose. Instead, Can we make 
> "virtio_delete_queue" static inline?
> 
yes, It will be a little confused, but I think it will have the same
problem if we make "virtio_delete_queue" static inline. We can directly
call it aslo. ´╝łe.g virtio-serial-bus.c virtio-balloon.c).

How about replacing the function name to make it more clear (e.g
virtio_delete_queue -> virtio_queue_cleanup) ? It's too similar between
"virtio_del_queue" and "virtio_delete_queue".

> Other than that:
> Reviewed-by: Pankaj Gupta <address@hidden>
> 
>>
>>
> 
> 
> .
> 




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