linux-kernel - Re: [PATCH net-next v5 1/7] tun: Refactor CONFIG_TUN_VNET_CROSS

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Message-ID: <67a3d2efbba32_170d392944d@willemb.c.googlers.com.notmuch>
Date: Wed, 05 Feb 2025 16:06:55 -0500
From: Willem de Bruijn <willemdebruijn.kernel@...il.com>
To: Akihiko Odaki <akihiko.odaki@...nix.com>, 
 Jonathan Corbet <corbet@....net>, 
 Willem de Bruijn <willemdebruijn.kernel@...il.com>, 
 Jason Wang <jasowang@...hat.com>, 
 "David S. Miller" <davem@...emloft.net>, 
 Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, 
 Paolo Abeni <pabeni@...hat.com>, 
 "Michael S. Tsirkin" <mst@...hat.com>, 
 Xuan Zhuo <xuanzhuo@...ux.alibaba.com>, 
 Shuah Khan <shuah@...nel.org>, 
 linux-doc@...r.kernel.org, 
 linux-kernel@...r.kernel.org, 
 netdev@...r.kernel.org, 
 kvm@...r.kernel.org, 
 virtualization@...ts.linux-foundation.org, 
 linux-kselftest@...r.kernel.org, 
 Yuri Benditovich <yuri.benditovich@...nix.com>, 
 Andrew Melnychenko <andrew@...nix.com>, 
 Stephen Hemminger <stephen@...workplumber.org>, 
 gur.stavi@...wei.com, 
 devel@...nix.com, 
 Akihiko Odaki <akihiko.odaki@...nix.com>
Cc: Willem de Bruijn <willemb@...gle.com>
Subject: Re: [PATCH net-next v5 1/7] tun: Refactor CONFIG_TUN_VNET_CROSS_LE

Akihiko Odaki wrote:
> Check IS_ENABLED(CONFIG_TUN_VNET_CROSS_LE) to save some lines and make
> future changes easier.
> 
> Signed-off-by: Akihiko Odaki <akihiko.odaki@...nix.com>
> Reviewed-by: Willem de Bruijn <willemb@...gle.com>
> ---
>  drivers/net/tun.c | 26 ++++++++------------------
>  1 file changed, 8 insertions(+), 18 deletions(-)
> 
> diff --git a/drivers/net/tun.c b/drivers/net/tun.c
> index e816aaba8e5f2ed06f8832f79553b6c976e75bb8..452fc5104260fe7ff5fdd5cedc5d2647cbe35c79 100644
> --- a/drivers/net/tun.c
> +++ b/drivers/net/tun.c
> @@ -298,10 +298,10 @@ static bool tun_napi_frags_enabled(const struct tun_file *tfile)
>  	return tfile->napi_frags_enabled;
>  }
>  
> -#ifdef CONFIG_TUN_VNET_CROSS_LE
>  static inline bool tun_legacy_is_little_endian(struct tun_struct *tun)
>  {
> -	return tun->flags & TUN_VNET_BE ? false :
> +	return !(IS_ENABLED(CONFIG_TUN_VNET_CROSS_LE) &&
> +		 (tun->flags & TUN_VNET_BE)) &&
>  		virtio_legacy_is_little_endian();

Since I have other comments to the series:

Can we make this a bit simpler to the reader, by splitting the test:

    if (IS_ENABLED(CONFIG_TUN_VNET_CROSS_LE) && tun->flags & TUN_VNET_BE)
            return false;

    return virtio_legacy_is_little_endian();