netdev - Re: [PATCH net-next 12/12] virtio_net: reject unsupported coalescing params

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Date:   Tue, 3 Mar 2020 20:07:43 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     davem@...emloft.net
Cc:     mkubecek@...e.cz, thomas.lendacky@....com, benve@...co.com,
        _govind@....com, pkaustub@...co.com, peppe.cavallaro@...com,
        alexandre.torgue@...com, joabreu@...opsys.com, snelson@...sando.io,
        yisen.zhuang@...wei.com, salil.mehta@...wei.com,
        jeffrey.t.kirsher@...el.com, jacob.e.keller@...el.com,
        alexander.h.duyck@...ux.intel.com, michael.chan@...adcom.com,
        saeedm@...lanox.com, leon@...nel.org, netdev@...r.kernel.org
Subject: Re: [PATCH net-next 12/12] virtio_net: reject unsupported
 coalescing params

On Tue,  3 Mar 2020 19:55:01 -0800 Jakub Kicinski wrote:
> Set ethtool_ops->coalesce_types to let the core reject
> unsupported coalescing parameters.
> 
> This driver did not previously reject unsupported parameters.
> 
> Signed-off-by: Jakub Kicinski <kuba@...nel.org>
> ---
>  drivers/net/virtio_net.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> index 84c0d9581f93..cfca3d134d4e 100644
> --- a/drivers/net/virtio_net.c
> +++ b/drivers/net/virtio_net.c
> @@ -2273,6 +2273,7 @@ static void virtnet_update_settings(struct virtnet_info *vi)
>  }
>  
>  static const struct ethtool_ops virtnet_ethtool_ops = {
> +	.coalesce_types = ETHTOOL_COALESCE_TX_MAX_FRAMES,

Ugh, the last minute addition backfired, virtio_net does not support
changing RX settings, but they must be always configured to 1. This
should have been:

	.coalesce_types = ETHTOOL_COALESCE_MAX_FRAMES,

And the driver does in fact check for unsupported parameters.

>  	.get_drvinfo = virtnet_get_drvinfo,
>  	.get_link = ethtool_op_get_link,
>  	.get_ringparam = virtnet_get_ringparam,