Re: [dpdk-dev] [PATCH 3/4] examples/vhost: use a new API to query remaining ring space

["Xia, Chenbo" <chenbo.xia@intel.com>]

> -----Original Message-----
> From: Ma, WenwuX <wenwux.ma@intel.com>
> Sent: Tuesday, September 7, 2021 4:49 AM
> To: dev@dpdk.org
> Cc: maxime.coquelin@redhat.com; Xia, Chenbo <chenbo.xia@intel.com>; Jiang,
> Cheng1 <cheng1.jiang@intel.com>; Hu, Jiayu <jiayu.hu@intel.com>; Pai G, Sunil
> <sunil.pai.g@intel.com>; Yang, YvonneX <yvonnex.yang@intel.com>; Ma, WenwuX
> <wenwux.ma@intel.com>
> Subject: [PATCH 3/4] examples/vhost: use a new API to query remaining ring
> space
> 
> A new API for querying the remaining descriptor ring capacity
> is available, so we use the new one instead of the old one.
> 
> Signed-off-by: Wenwu Ma <wenwux.ma@intel.com>
> Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>
> ---
>  examples/vhost/ioat.c | 6 +-----
>  1 file changed, 1 insertion(+), 5 deletions(-)
> 
> diff --git a/examples/vhost/ioat.c b/examples/vhost/ioat.c
> index 457f8171f0..6adc30b622 100644
> --- a/examples/vhost/ioat.c
> +++ b/examples/vhost/ioat.c
> @@ -17,7 +17,6 @@ struct packet_tracker {
>  	unsigned short next_read;
>  	unsigned short next_write;
>  	unsigned short last_remain;
> -	unsigned short ioat_space;
>  };
> 
>  struct packet_tracker cb_tracker[MAX_VHOST_DEVICE];
> @@ -113,7 +112,6 @@ open_ioat(const char *value)
>  			goto out;
>  		}
>  		rte_rawdev_start(dev_id);
> -		cb_tracker[dev_id].ioat_space = IOAT_RING_SIZE - 1;
>  		dma_info->nr++;
>  		i++;
>  	}
> @@ -140,7 +138,7 @@ ioat_transfer_data_cb(int vid, uint16_t queue_id,
>  			src = descs[i_desc].src;
>  			dst = descs[i_desc].dst;
>  			i_seg = 0;
> -			if (cb_tracker[dev_id].ioat_space < src->nr_segs)
> +			if (rte_ioat_burst_capacity(dev_id) < src->nr_segs)
>  				break;
>  			while (i_seg < src->nr_segs) {
>  				rte_ioat_enqueue_copy(dev_id,
> @@ -155,7 +153,6 @@ ioat_transfer_data_cb(int vid, uint16_t queue_id,
>  			}
>  			write &= mask;
>  			cb_tracker[dev_id].size_track[write] = src->nr_segs;
> -			cb_tracker[dev_id].ioat_space -= src->nr_segs;
>  			write++;
>  		}
>  	} else {
> @@ -194,7 +191,6 @@ ioat_check_completed_copies_cb(int vid, uint16_t queue_id,
>  		if (n_seg == 0)
>  			return 0;
> 
> -		cb_tracker[dev_id].ioat_space += n_seg;
>  		n_seg += cb_tracker[dev_id].last_remain;
> 
>  		read = cb_tracker[dev_id].next_read;
> --
> 2.25.1

Reviewed-by: Chenbo Xia <chenbo.xia@intel.com>