netdev - Re: [PATCH 2/2] tools/virtio: Add hints when module is not installed

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Date: Sun, 8 Oct 2023 12:35:30 +0800
From: Jason Wang <jasowang@...hat.com>
To: liming.wu@...uarmicro.com
Cc: "Michael S . Tsirkin" <mst@...hat.com>, kvm@...r.kernel.org, 
	virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org, 
	linux-kernel@...r.kernel.org, 398776277@...com
Subject: Re: [PATCH 2/2] tools/virtio: Add hints when module is not installed

On Tue, Sep 26, 2023 at 1:00 PM <liming.wu@...uarmicro.com> wrote:
>
> From: Liming Wu <liming.wu@...uarmicro.com>
>
> Need to insmod vhost_test.ko before run virtio_test.
> Give some hints to users.
>
> Signed-off-by: Liming Wu <liming.wu@...uarmicro.com>
> ---
>  tools/virtio/virtio_test.c | 4 ++++
>  1 file changed, 4 insertions(+)
>
> diff --git a/tools/virtio/virtio_test.c b/tools/virtio/virtio_test.c
> index 028f54e6854a..ce2c4d93d735 100644
> --- a/tools/virtio/virtio_test.c
> +++ b/tools/virtio/virtio_test.c
> @@ -135,6 +135,10 @@ static void vdev_info_init(struct vdev_info* dev, unsigned long long features)
>         dev->buf = malloc(dev->buf_size);
>         assert(dev->buf);
>         dev->control = open("/dev/vhost-test", O_RDWR);
> +
> +       if (dev->control < 0)
> +               fprintf(stderr, "Install vhost_test module" \
> +               "(./vhost_test/vhost_test.ko) firstly\n");

There should be many other reasons to fail for open().

Let's use strerror()?

Thanks


>         assert(dev->control >= 0);
>         r = ioctl(dev->control, VHOST_SET_OWNER, NULL);
>         assert(r >= 0);
> --
> 2.34.1
>