linux-kernel - Re: [PATCH RFC v5 06/10] tun: Introduce virtio-net hash reporting feature

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Message-ID: <67068bc5283a3_1cca3129482@willemb.c.googlers.com.notmuch>
Date: Wed, 09 Oct 2024 09:57:25 -0400
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, 
 Akihiko Odaki <akihiko.odaki@...nix.com>
Subject: Re: [PATCH RFC v5 06/10] tun: Introduce virtio-net hash reporting
 feature

Akihiko Odaki wrote:
> Allow the guest to reuse the hash value to make receive steering
> consistent between the host and guest, and to save hash computation.
> 
> Signed-off-by: Akihiko Odaki <akihiko.odaki@...nix.com>
> ---
>  Documentation/networking/tuntap.rst |   7 +++
>  drivers/net/Kconfig                 |   1 +
>  drivers/net/tap.c                   |  45 ++++++++++++++--
>  drivers/net/tun.c                   |  46 ++++++++++++----
>  drivers/net/tun_vnet.h              | 102 +++++++++++++++++++++++++++++++-----
>  include/linux/if_tap.h              |   2 +
>  include/uapi/linux/if_tun.h         |  48 +++++++++++++++++
>  7 files changed, 223 insertions(+), 28 deletions(-)
> 
> diff --git a/Documentation/networking/tuntap.rst b/Documentation/networking/tuntap.rst
> index 4d7087f727be..86b4ae8caa8a 100644
> --- a/Documentation/networking/tuntap.rst
> +++ b/Documentation/networking/tuntap.rst
> @@ -206,6 +206,13 @@ enable is true we enable it, otherwise we disable it::
>        return ioctl(fd, TUNSETQUEUE, (void *)&ifr);
>    }
>  
> +3.4 Reference
> +-------------
> +
> +``linux/if_tun.h`` defines the interface described below:
> +
> +.. kernel-doc:: include/uapi/linux/if_tun.h
> +
>  Universal TUN/TAP device driver Frequently Asked Question
>  =========================================================
>  
> diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
> index 9920b3a68ed1..e2a7bd703550 100644
> --- a/drivers/net/Kconfig
> +++ b/drivers/net/Kconfig
> @@ -395,6 +395,7 @@ config TUN
>  	tristate "Universal TUN/TAP device driver support"
>  	depends on INET
>  	select CRC32
> +	select SKB_EXTENSIONS
>  	help
>  	  TUN/TAP provides packet reception and transmission for user space
>  	  programs.  It can be viewed as a simple Point-to-Point or Ethernet
> diff --git a/drivers/net/tap.c b/drivers/net/tap.c
> index 9a34ceed0c2c..5e2fbe63ca47 100644

Merge the earlier tiny patch 2 into this one.