Re: [PATCH V2 12/21] vhost-vdpa: open device fd in net_init_vhost_vdpa()

["Michael S. Tsirkin" <mst@redhat.com>]

On Fri, Sep 03, 2021 at 05:10:22PM +0800, Jason Wang wrote:
> This path switches to open device fd in net_init_vhost_vpda(). This is

patch?

> used to prepare for the multiqueue support.
> 
> Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
> Signed-off-by: Jason Wang <jasowang@redhat.com>
> ---
>  net/vhost-vdpa.c | 23 +++++++++++++++--------
>  1 file changed, 15 insertions(+), 8 deletions(-)
> 
> diff --git a/net/vhost-vdpa.c b/net/vhost-vdpa.c
> index 912686457c..73d29a74ef 100644
> --- a/net/vhost-vdpa.c
> +++ b/net/vhost-vdpa.c
> @@ -156,24 +156,19 @@ static NetClientInfo net_vhost_vdpa_info = {
>  };
>  
>  static int net_vhost_vdpa_init(NetClientState *peer, const char *device,
> -                               const char *name, const char *vhostdev)
> +                               const char *name, int vdpa_device_fd)
>  {
>      NetClientState *nc = NULL;
>      VhostVDPAState *s;
> -    int vdpa_device_fd = -1;
>      int ret = 0;
>      assert(name);
>      nc = qemu_new_net_client(&net_vhost_vdpa_info, peer, device, name);
>      snprintf(nc->info_str, sizeof(nc->info_str), TYPE_VHOST_VDPA);
>      s = DO_UPCAST(VhostVDPAState, nc, nc);
> -    vdpa_device_fd = qemu_open_old(vhostdev, O_RDWR);
> -    if (vdpa_device_fd == -1) {
> -        return -errno;
> -    }
> +
>      s->vhost_vdpa.device_fd = vdpa_device_fd;
>      ret = vhost_vdpa_add(nc, (void *)&s->vhost_vdpa);
>      if (ret) {
> -        qemu_close(vdpa_device_fd);
>          qemu_del_net_client(nc);
>      }
>      return ret;
> @@ -201,6 +196,7 @@ int net_init_vhost_vdpa(const Netdev *netdev, const char *name,
>                          NetClientState *peer, Error **errp)
>  {
>      const NetdevVhostVDPAOptions *opts;
> +    int vdpa_device_fd, ret;
>  
>      assert(netdev->type == NET_CLIENT_DRIVER_VHOST_VDPA);
>      opts = &netdev->u.vhost_vdpa;
> @@ -209,5 +205,16 @@ int net_init_vhost_vdpa(const Netdev *netdev, const char *name,
>                            (char *)name, errp)) {
>          return -1;
>      }
> -    return net_vhost_vdpa_init(peer, TYPE_VHOST_VDPA, name, opts->vhostdev);
> +
> +    vdpa_device_fd = qemu_open_old(opts->vhostdev, O_RDWR);
> +    if (vdpa_device_fd == -1) {
> +        return -errno;
> +    }
> +
> +    ret = net_vhost_vdpa_init(peer, TYPE_VHOST_VDPA, name, vdpa_device_fd);
> +    if (ret) {
> +        qemu_close(vdpa_device_fd);
> +    }
> +
> +    return ret;
>  }
> -- 
> 2.25.1