netdev - Re: [PATCH RFC net-next 2/7] netdev_features: convert NETIF_F_LLTX to priv_flag IFF

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Message-ID: <20240415143728.GB2320920@kernel.org>
Date: Mon, 15 Apr 2024 15:37:28 +0100
From: Simon Horman <horms@...nel.org>
To: Alexander Lobakin <aleksander.lobakin@...el.com>
Cc: "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	David Ahern <dsahern@...nel.org>,
	Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
	Andrew Lunn <andrew@...n.ch>,
	nex.sw.ncis.osdt.itp.upstreaming@...el.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC net-next 2/7] netdev_features: convert NETIF_F_LLTX
 to priv_flag IFF_LLTX

On Fri, Apr 05, 2024 at 03:37:26PM +0200, Alexander Lobakin wrote:
> NETIF_F_LLTX can't be changed via Ethtool and is not a feature, rather
> an attribute, very similar to IFF_NO_QUEUE.
> Free one netdev_features_t bit and make it a private flag.
> 
> Signed-off-by: Alexander Lobakin <aleksander.lobakin@...el.com>

...

> diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
> index 0c198620ac93..065dd68fe97c 100644
> --- a/include/linux/netdevice.h
> +++ b/include/linux/netdevice.h
> @@ -1649,6 +1649,8 @@ struct net_device_ops {
>   * @IFF_SEE_ALL_HWTSTAMP_REQUESTS: device wants to see calls to
>   *	ndo_hwtstamp_set() for all timestamp requests regardless of source,
>   *	even if those aren't HWTSTAMP_SOURCE_NETDEV.
> + @ @IFF_LLTX: device supports lockless Tx. Mainly used by logical interfaces,

Hi Alexander,

Sorry if this has already been flagged - I thought so but I can't find it now.

" @ @IFF_LLTX:" should probably be " * @IFF_LLTX:"

Flagged by ./scripts/kernel-doc -none

> + *	such as tunnels.
>   */
>  enum netdev_priv_flags {
>  	IFF_802_1Q_VLAN			= 1<<0,

...