Re: [dpdk-dev] [PATCH v7 08/11] vhost: fix vring functions to support packed ring

[Tiwei Bie <tiwei.bie@intel.com>]

On Tue, Sep 17, 2019 at 10:52:31PM +0800, JinYu wrote:
> This patch fix two APIs so user can get the packed ring
> support.
> 
> Fixes: fceec568 (vhost: add packed ring)
> Cc: stable@dpdk.org

I changed my mind, as the packed ring related fields are just
added to rte_vhost_vring in this series, we shouldn't treat
this change as a fix and there is no need to cc stable.
Please also update the title correspondingly.

Thanks!
Tiwei

> 
> Signed-off-by: Lin Li <lilin24@baidu.com>
> Signed-off-by: Xun Ni <nixun@baidu.com>
> Signed-off-by: Yu Zhang <zhangyu31@baidu.com>
> Signed-off-by: Jin Yu <jin.yu@intel.com>
> ---
>  lib/librte_vhost/vhost.c | 68 +++++++++++++++++++++++++++++-----------
>  1 file changed, 49 insertions(+), 19 deletions(-)
> 
> diff --git a/lib/librte_vhost/vhost.c b/lib/librte_vhost/vhost.c
> index 95f99ea51..1b6dcca98 100644
> --- a/lib/librte_vhost/vhost.c
> +++ b/lib/librte_vhost/vhost.c
> @@ -771,9 +771,15 @@ rte_vhost_get_vhost_vring(int vid, uint16_t vring_idx,
>  	if (!vq)
>  		return -1;
>  
> -	vring->desc  = vq->desc;
> -	vring->avail = vq->avail;
> -	vring->used  = vq->used;
> +	if (vq_is_packed(dev)) {
> +		vring->desc_packed = vq->desc_packed;
> +		vring->driver_event = vq->driver_event;
> +		vring->device_event = vq->device_event;
> +	} else {
> +		vring->desc = vq->desc;
> +		vring->avail = vq->avail;
> +		vring->used = vq->used;
> +	}
>  	vring->log_guest_addr  = vq->log_guest_addr;
>  
>  	vring->callfd  = vq->callfd;
> @@ -1273,13 +1279,51 @@ int rte_vhost_get_log_base(int vid, uint64_t *log_base,
>  int rte_vhost_get_vring_base(int vid, uint16_t queue_id,
>  		uint16_t *last_avail_idx, uint16_t *last_used_idx)
>  {
> +	struct vhost_virtqueue *vq;
>  	struct virtio_net *dev = get_device(vid);
>  
>  	if (dev == NULL || last_avail_idx == NULL || last_used_idx == NULL)
>  		return -1;
>  
> -	*last_avail_idx = dev->virtqueue[queue_id]->last_avail_idx;
> -	*last_used_idx = dev->virtqueue[queue_id]->last_used_idx;
> +	vq = dev->virtqueue[queue_id];
> +	if (!vq)
> +		return -1;
> +
> +	if (vq_is_packed(dev)) {
> +		*last_avail_idx = (vq->avail_wrap_counter << 15) |
> +					vq->last_avail_idx;
> +		*last_used_idx = (vq->used_wrap_counter << 15) |
> +					vq->last_used_idx;
> +	} else {
> +		*last_avail_idx = vq->last_avail_idx;
> +		*last_used_idx = vq->last_used_idx;
> +	}
> +
> +	return 0;
> +}
> +
> +int rte_vhost_set_vring_base(int vid, uint16_t queue_id,
> +		uint16_t last_avail_idx, uint16_t last_used_idx)
> +{
> +	struct vhost_virtqueue *vq;
> +	struct virtio_net *dev = get_device(vid);
> +
> +	if (!dev)
> +		return -1;
> +
> +	vq = dev->virtqueue[queue_id];
> +	if (!vq)
> +		return -1;
> +
> +	if (vq_is_packed(dev)) {
> +		vq->last_avail_idx = last_avail_idx & 0x7fff;
> +		vq->avail_wrap_counter = !!(last_avail_idx & (1 << 15));
> +		vq->last_used_idx = last_used_idx & 0x7fff;
> +		vq->used_wrap_counter = !!(last_used_idx & (1 << 15));
> +	} else {
> +		vq->last_avail_idx = last_avail_idx;
> +		vq->last_used_idx = last_used_idx;
> +	}
>  
>  	return 0;
>  }
> @@ -1308,20 +1352,6 @@ rte_vhost_get_vring_base_from_inflight(int vid,
>  	return 0;
>  }
>  
> -int rte_vhost_set_vring_base(int vid, uint16_t queue_id,
> -		uint16_t last_avail_idx, uint16_t last_used_idx)
> -{
> -	struct virtio_net *dev = get_device(vid);
> -
> -	if (!dev)
> -		return -1;
> -
> -	dev->virtqueue[queue_id]->last_avail_idx = last_avail_idx;
> -	dev->virtqueue[queue_id]->last_used_idx = last_used_idx;
> -
> -	return 0;
> -}
> -
>  int rte_vhost_extern_callback_register(int vid,
>  		struct rte_vhost_user_extern_ops const * const ops, void *ctx)
>  {
> -- 
> 2.17.2
>