netdev - Re: [PATCH net-next 1/8] mpls: Refactor how the mpls module is built

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Date:	Thu, 26 Feb 2015 11:05:04 +0900
From:	Simon Horman <horms@...ge.net.au>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	roopa <roopa@...ulusnetworks.com>,
	Stephen Hemminger <stephen@...workplumber.org>,
	santiago@...reenet.org
Subject: Re: [PATCH net-next 1/8] mpls: Refactor how the mpls module is built

On Wed, Feb 25, 2015 at 11:13:02AM -0600, Eric W. Biederman wrote:
> 
> This refactoring is needed to allow more than just mpls gso support to
> be built into the mpls moddule.
> 
> Signed-off-by: "Eric W. Biederman" <ebiederm@...ssion.com>
> ---
>  net/Makefile     |  2 +-
>  net/mpls/Kconfig | 18 +++++++++++++++++-
>  2 files changed, 18 insertions(+), 2 deletions(-)
> 
> diff --git a/net/Makefile b/net/Makefile
> index 38704bdf941a..3995613e5510 100644
> --- a/net/Makefile
> +++ b/net/Makefile
> @@ -69,7 +69,7 @@ obj-$(CONFIG_BATMAN_ADV)	+= batman-adv/
>  obj-$(CONFIG_NFC)		+= nfc/
>  obj-$(CONFIG_OPENVSWITCH)	+= openvswitch/
>  obj-$(CONFIG_VSOCKETS)	+= vmw_vsock/
> -obj-$(CONFIG_NET_MPLS_GSO)	+= mpls/
> +obj-$(CONFIG_MPLS)		+= mpls/
>  obj-$(CONFIG_HSR)		+= hsr/
>  ifneq ($(CONFIG_NET_SWITCHDEV),)
>  obj-y				+= switchdev/
> diff --git a/net/mpls/Kconfig b/net/mpls/Kconfig
> index 37421db88965..a77fbcdd04ee 100644
> --- a/net/mpls/Kconfig
> +++ b/net/mpls/Kconfig
> @@ -1,9 +1,25 @@
>  #
>  # MPLS configuration
>  #
> +
> +menuconfig MPLS
> +	tristate "MultiProtocol Label Switching"
> +	default n
> +	---help---
> +	  MultiProtocol Label Switching routes packets through logical
> +	  circuits.  Originally conceved as a way of routing packets at
> +	  hardware speeds (before hardware was capable of routing ipv4 packets),
> +	  MPLS remains as simple way of making tunnels.
> +
> +	  If you have not heard of MPLS you probably want to say N here.
> +
> +if MPLS
> +
>  config NET_MPLS_GSO
> -	tristate "MPLS: GSO support"
> +	bool "MPLS: GSO support"
>  	help
>  	 This is helper module to allow segmentation of non-MPLS GSO packets
>  	 that have had MPLS stack entries pushed onto them and thus
>  	 become MPLS GSO packets.
> +
> +endif # MPLS

Is the implication here that MPLS must be selected to allow NET_MPLS_GSO to
be selected? That is if NET_MPLS_GSO is to be used to handle MPLS packets
emitted by OVS then now MPLS also needs to be selected?
--
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