Re: [PATCH 8/9] vhost-vdpa: add accurate error string when fail to open vhost vDPA device

[Laurent Vivier <lvivier@redhat.com>]

On 31/08/2020 10:27, Jason Wang wrote:
> This patch adds more accurate error string when fail to open vhost
> vDPA device.
> 
> Signed-off-by: Jason Wang <jasowang@redhat.com>
> ---
>  net/vhost-vdpa.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/net/vhost-vdpa.c b/net/vhost-vdpa.c
> index f5cc4e8326..9a6f0b63d3 100644
> --- a/net/vhost-vdpa.c
> +++ b/net/vhost-vdpa.c
> @@ -219,6 +219,7 @@ int net_init_vhost_vdpa(const Netdev *netdev, const char *name,

I think you can also remove the "assert(name)", qemu_net_client_setup()
in qemu_new_net_client() uses a default value if NULL.

>      s = DO_UPCAST(VhostVDPAState, nc, nc);
>      vdpa_device_fd = qemu_open(opts->vhostdev, O_RDWR);
>      if (vdpa_device_fd == -1) {
> +        error_setg(errp, "Fail to open vhost-vdpa device %s", opts->vhostdev);
>          return -errno;

you can "return -1" now: no one checks for the exact returned value, all
the other init functions from net_client_init_fun[] return -1 or 0, and
the errno is now in the error string.

>      }
>      s->vhost_vdpa.device_fd = vdpa_device_fd;
> 

Thanks,
Laurent