[dpdk-dev] [PATCH v1 2/4] vhost: skip access lock when vDPA is configured

[Maxime Coquelin]

On 6/18/20 6:28 PM, Matan Azrad wrote:
> No need to take access lock in the vhost-user massage handler when

s/massage/message/

> vDPA driver controls all the data-path of the vhost device.
> 
> It allows the vDPA set_vring_state operation callback to configure
> guest notifications.
> 
> Signed-off-by: Matan Azrad <matan at mellanox.com>
> ---
>  lib/librte_vhost/vhost_user.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/lib/librte_vhost/vhost_user.c b/lib/librte_vhost/vhost_user.c
> index cddfa4b..b0849b9 100644
> --- a/lib/librte_vhost/vhost_user.c
> +++ b/lib/librte_vhost/vhost_user.c
> @@ -2699,8 +2699,10 @@ typedef int (*vhost_message_handler_t)(struct virtio_net **pdev,
>  	case VHOST_USER_SEND_RARP:
>  	case VHOST_USER_NET_SET_MTU:
>  	case VHOST_USER_SET_SLAVE_REQ_FD:
> -		vhost_user_lock_all_queue_pairs(dev);
> -		unlock_required = 1;
> +		if (!(dev->flags & VIRTIO_DEV_VDPA_CONFIGURED)) {
> +			vhost_user_lock_all_queue_pairs(dev);
> +			unlock_required = 1;
> +		}
>  		break;
>  	default:
>  		break;
> 

Makes sense:

Reviewed-by: Maxime Coquelin <maxime.coquelin at redhat.com>

Thanks,
Maxime