Re: [dpdk-dev] [RFC PATCH v2 01/14] enable VIRTIO_NET_F_CTRL_RX VIRTIO_NET_F_CTRL_RX is dependant on VIRTIO_NET_F_CTRL_VQ. Observed that virtio-net driver in guest would crash with only CTRL_RX enabled.

[Linhaifeng <haifeng.lin@huawei.com>]

On 2015/1/26 11:20, Huawei Xie wrote:
> In virtnet_send_command:
> 
> 	/* Caller should know better */
> 	BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ) ||
> 		(out + in > VIRTNET_SEND_COMMAND_SG_MAX));
> 
> Signed-off-by: Huawei Xie <huawei.xie@intel.com>
> ---
>  lib/librte_vhost/virtio-net.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/lib/librte_vhost/virtio-net.c b/lib/librte_vhost/virtio-net.c
> index b041849..52b4957 100644
> --- a/lib/librte_vhost/virtio-net.c
> +++ b/lib/librte_vhost/virtio-net.c
> @@ -73,7 +73,8 @@ static struct virtio_net_config_ll *ll_root;
>  
>  /* Features supported by this lib. */
>  #define VHOST_SUPPORTED_FEATURES ((1ULL << VIRTIO_NET_F_MRG_RXBUF) | \
> -				  (1ULL << VIRTIO_NET_F_CTRL_RX))
> +				(1ULL << VIRTIO_NET_F_CTRL_VQ) | \
> +				(1ULL << VIRTIO_NET_F_CTRL_RX))
>  static uint64_t VHOST_FEATURES = VHOST_SUPPORTED_FEATURES;
>  
>  /* Line size for reading maps file. */
> 

Hi,Xie

If don't have features VIRTIO_NET_F_CTRL_VQ and  VIRTIO_NET_F_CTRL_RX what would happen?
Why add the two features?
-- 
Regards,
Haifeng