Re: [dpdk-dev] [PATCH 11/17] vhost: add helpers for packed virtqueues

[Jens Freimann <jfreimann@redhat.com>]

On Mon, Mar 19, 2018 at 06:39:56PM +0800, Tiwei Bie wrote:
>On Fri, Mar 16, 2018 at 04:21:14PM +0100, Jens Freimann wrote:
>> Add some helper functions to set/check descriptor flags
>> and toggle the used wrap counter.
>>
>> Signed-off-by: Jens Freimann <jfreimann@redhat.com>
>[...]
>>
>> +static inline void
>> +toggle_wrap_counter(struct vhost_virtqueue *vq)
>> +{
>> +	vq->used_wrap_counter ^= 1;
>> +}
>> +
>> +static inline int
>> +desc_is_avail(struct vhost_virtqueue *vq, struct vring_desc_packed *desc)
>> +{
>> +	if (unlikely(!vq))
>> +		return -1;
>
>Maybe it's better to let the caller make sure the vq
>won't be NULL.
>
>> +
>> +	if (vq->used_wrap_counter == 1)
>> +		if ((desc->flags & DESC_AVAIL) && !(desc->flags & DESC_USED))
>> +			return 1;
>> +	if (vq->used_wrap_counter == 0)
>
>Maybe it's better to use '} else {' here.

Agree with both, thanks for the review!

regards,
Jens