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Message-ID: <65bbbc1d2e236_222699294f4@willemb.c.googlers.com.notmuch>
Date: Thu, 01 Feb 2024 10:43:25 -0500
From: Willem de Bruijn <willemdebruijn.kernel@...il.com>
To: Yunjian Wang <wangyunjian@...wei.com>,
willemdebruijn.kernel@...il.com,
jasowang@...hat.com,
kuba@...nel.org,
davem@...emloft.net
Cc: netdev@...r.kernel.org,
linux-kernel@...r.kernel.org,
xudingke@...wei.com,
Yunjian Wang <wangyunjian@...wei.com>
Subject: Re: [PATCH net-next] tun: Implement ethtool's get_channels() callback
Yunjian Wang wrote:
> Implement the tun .get_channels functionality. This feature is necessary
> for some tools, such as libxdp, which need to retrieve the queue count.
>
> Signed-off-by: Yunjian Wang <wangyunjian@...wei.com>
> ---
> drivers/net/tun.c | 10 ++++++++++
> 1 file changed, 10 insertions(+)
>
> diff --git a/drivers/net/tun.c b/drivers/net/tun.c
> index afa5497f7c35..7cf448ff93ee 100644
> --- a/drivers/net/tun.c
> +++ b/drivers/net/tun.c
> @@ -3638,12 +3638,22 @@ static int tun_set_coalesce(struct net_device *dev,
> return 0;
> }
>
> +static void tun_get_channels(struct net_device *dev,
> + struct ethtool_channels *channels)
> +{
> + struct tun_struct *tun = netdev_priv(dev);
> +
> + channels->combined_count = tun->numqueues;
> + channels->max_combined = MAX_TAP_QUEUES;
Conditional on IFF_MULTI_QUEUE?
> +}
> +
> static const struct ethtool_ops tun_ethtool_ops = {
> .supported_coalesce_params = ETHTOOL_COALESCE_RX_MAX_FRAMES,
> .get_drvinfo = tun_get_drvinfo,
> .get_msglevel = tun_get_msglevel,
> .set_msglevel = tun_set_msglevel,
> .get_link = ethtool_op_get_link,
> + .get_channels = tun_get_channels,
> .get_ts_info = ethtool_op_get_ts_info,
> .get_coalesce = tun_get_coalesce,
> .set_coalesce = tun_set_coalesce,
> --
> 2.33.0
>
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