Re: [dpdk-dev] [PATCH 2/6] lib_vhost: Support multiple queues in virtio dev

["Xie, Huawei" <huawei.xie@intel.com>]

On 5/21/2015 3:51 PM, Ouyang Changchun wrote:
> Each virtio device could have multiple queues, say 2 or 4, at most 8.
> Enabling this feature allows virtio device/port on guest has the ability to
> use different vCPU to receive/transmit packets from/to each queue.
>
> In multiple queues mode, virtio device readiness means all queues of
> this virtio device are ready, cleanup/destroy a virtio device also
> requires clearing all queues belong to it.
>
> Signed-off-by: Changchun Ouyang <changchun.ouyang@intel.com>
> ---
>  lib/librte_vhost/rte_virtio_net.h             |  15 ++-
>  lib/librte_vhost/vhost_rxtx.c                 |  32 ++++---
>  lib/librte_vhost/vhost_user/vhost-net-user.c  |   4 +-
>  lib/librte_vhost/vhost_user/virtio-net-user.c |  97 +++++++++++++++----
>  lib/librte_vhost/vhost_user/virtio-net-user.h |   2 +
>  lib/librte_vhost/virtio-net.c                 | 132 +++++++++++++++++---------
>  6 files changed, 201 insertions(+), 81 deletions(-)
>
> diff --git a/lib/librte_vhost/rte_virtio_net.h b/lib/librte_vhost/rte_virtio_net.h
> index 5d38185..3e82bef 100644
> --- a/lib/librte_vhost/rte_virtio_net.h
> +++ b/lib/librte_vhost/rte_virtio_net.h
> @@ -59,6 +59,10 @@ struct rte_mbuf;

Some basic question:
Does vhost have no way to know how many queues each virtio device has?
rte_vhost_q_num_set would set the same number of queues for all virtio
devices, so different virtio devices couldn't have different number of
queues.