[RFC 16/27] net/vhost: use API to set max queue pairs

[Xia, Chenbo]

> -----Original Message-----
> From: Maxime Coquelin <maxime.coquelin at redhat.com>
> Sent: Friday, March 31, 2023 11:43 PM
> To: dev at dpdk.org; david.marchand at redhat.com; Xia, Chenbo
> <chenbo.xia at intel.com>; mkp at redhat.com; fbl at redhat.com;
> jasowang at redhat.com; Liang, Cunming <cunming.liang at intel.com>; Xie, Yongji
> <xieyongji at bytedance.com>; echaudro at redhat.com; eperezma at redhat.com;
> amorenoz at redhat.com
> Cc: Maxime Coquelin <maxime.coquelin at redhat.com>
> Subject: [RFC 16/27] net/vhost: use API to set max queue pairs
> 
> In order to support multiqueue with VDUSE, we need to
> be able to limit the maximum number of queue pairs, to
> avoid unnecessary memory consumption since the maximum
> number of queue pairs need to be allocated at device
> creation time, as opposed to Vhost-user which allocate
> only when the frontend initialize them.
> 
> Signed-off-by: Maxime Coquelin <maxime.coquelin at redhat.com>
> ---
>  drivers/net/vhost/rte_eth_vhost.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/net/vhost/rte_eth_vhost.c
> b/drivers/net/vhost/rte_eth_vhost.c
> index 62ef955ebc..8d37ec9775 100644
> --- a/drivers/net/vhost/rte_eth_vhost.c
> +++ b/drivers/net/vhost/rte_eth_vhost.c
> @@ -1013,6 +1013,9 @@ vhost_driver_setup(struct rte_eth_dev *eth_dev)
>  			goto drv_unreg;
>  	}
> 
> +	if (rte_vhost_driver_set_max_queue_num(internal->iface_name,
> internal->max_queues))
> +		goto drv_unreg;
> +
>  	if (rte_vhost_driver_callback_register(internal->iface_name,
>  					       &vhost_ops) < 0) {
>  		VHOST_LOG(ERR, "Can't register callbacks\n");
> --
> 2.39.2

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