[dpdk-dev,5/5] net/vhost: remove limit of vhost RX burst size

  vhost removes limit of RX burst size(32 pkts) and supports to make
an best effort to receive pkts.

Cc: yuanhan.liu@linux.intel.com
Cc: maxime.coquelin@redhat.com

Signed-off-by: Zhiyong Yang <zhiyong.yang@intel.com>
---
 drivers/net/vhost/rte_eth_vhost.c | 23 +++++++++++++++++++++--
 1 file changed, 21 insertions(+), 2 deletions(-)
  

On 02/24/2017 08:48 AM, Zhiyong Yang wrote:
> vhost removes limit of RX burst size(32 pkts) and supports to make
> an best effort to receive pkts.
> 
> Cc: yuanhan.liu@linux.intel.com
> Cc: maxime.coquelin@redhat.com
> 
> Signed-off-by: Zhiyong Yang <zhiyong.yang@intel.com>
> ---
>  drivers/net/vhost/rte_eth_vhost.c | 23 +++++++++++++++++++++--
>  1 file changed, 21 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/vhost/rte_eth_vhost.c b/drivers/net/vhost/rte_eth_vhost.c
> index 1e1fa34..8a97c2a 100644
> --- a/drivers/net/vhost/rte_eth_vhost.c
> +++ b/drivers/net/vhost/rte_eth_vhost.c
> @@ -402,9 +402,28 @@ eth_vhost_rx(void *q, struct rte_mbuf **bufs, uint16_t nb_bufs)
>  		goto out;
>  
>  	/* Dequeue packets from guest TX queue */
> -	nb_rx = rte_vhost_dequeue_burst(r->vid,
> -			r->virtqueue_id, r->mb_pool, bufs, nb_bufs);
> +	if (likely(nb_bufs <= VHOST_MAX_PKT_BURST))
> +		nb_rx = rte_vhost_dequeue_burst(r->vid, r->virtqueue_id,
> +						r->mb_pool, bufs, nb_bufs);
> +	else {
> +		uint16_t nb_receive = nb_bufs;
> +
> +		while (nb_receive) {
> +			uint16_t nb_pkts;
> +			uint16_t num = (uint16_t)RTE_MIN(nb_receive,
> +					VHOST_MAX_PKT_BURST);
>  
> +			nb_pkts = rte_vhost_dequeue_burst(r->vid,
> +							  r->virtqueue_id,
> +							  r->mb_pool,
> +							  &bufs[nb_rx], num);
> +
> +			nb_rx += nb_pkts;
> +			nb_receive -= nb_pkts;
> +			if (nb_pkts < num)
> +				break;
> +		}

Similar comment for this as for vhost tx

> +	}
>  	r->stats.pkts += nb_rx;
>  
>  	for (i = 0; likely(i < nb_rx); i++) {
>