netdev - Re: [PATCH v2] openvswitch: Add Kconfig dependency on GRE-DEMUX.

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Message-ID: <51CDF979.7040605@infradead.org>
Date:	Fri, 28 Jun 2013 14:00:41 -0700
From:	Randy Dunlap <rdunlap@...radead.org>
To:	Pravin B Shelar <pshelar@...ira.com>
CC:	netdev@...r.kernel.org, dev@...nvswitch.org,
	bhutchings@...arflare.com, Jesse Gross <jesse@...ira.com>
Subject: Re: [PATCH v2] openvswitch: Add Kconfig dependency on GRE-DEMUX.

On 06/28/13 12:39, Pravin B Shelar wrote:
> Openvswitch uses function from NET_IPGRE_DEMUX module.
> Add Kconfig dependency to fix following compilation errors:
> http://marc.info/?l=linux-netdev&m=137244035226634
> 
> CC: Jesse Gross <jesse@...ira.com>
> Reported-by: Randy Dunlap <rdunlap@...radead.org>
> Signed-off-by: Pravin Shelar <pshelar@...ira.com>

Well, that works if CONFIG_INET is enabled, but if I disable that
kconfig symbol and then rebuild, this is what happens:


net/openvswitch/vport-gre.c: In function 'gre_tnl_send':
net/openvswitch/vport-gre.c:179:2: error: implicit declaration of function 'iptunnel_xmit' [-Werror=implicit-function-declaration]


> ---
> v1-v2:
> - use select to resolve dependency.
> ---
>  net/openvswitch/Kconfig     |    1 +
>  net/openvswitch/vport-gre.c |    2 --
>  net/openvswitch/vport.c     |    3 ---
>  3 files changed, 1 insertions(+), 5 deletions(-)
> 
> diff --git a/net/openvswitch/Kconfig b/net/openvswitch/Kconfig
> index 9fbc04a..deaa9bb 100644
> --- a/net/openvswitch/Kconfig
> +++ b/net/openvswitch/Kconfig
> @@ -4,6 +4,7 @@
>  
>  config OPENVSWITCH
>  	tristate "Open vSwitch"
> +	select NET_IPGRE_DEMUX
>  	---help---
>  	  Open vSwitch is a multilayer Ethernet switch targeted at virtualized
>  	  environments.  In addition to supporting a variety of features
> diff --git a/net/openvswitch/vport-gre.c b/net/openvswitch/vport-gre.c
> index 943e5c4..21d5073 100644
> --- a/net/openvswitch/vport-gre.c
> +++ b/net/openvswitch/vport-gre.c
> @@ -16,7 +16,6 @@
>   * 02110-1301, USA
>   */
>  
> -#if IS_ENABLED(CONFIG_NET_IPGRE_DEMUX)
>  #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
>  
>  #include <linux/if.h>
> @@ -271,4 +270,3 @@ const struct vport_ops ovs_gre_vport_ops = {
>  	.get_name	= gre_get_name,
>  	.send		= gre_tnl_send,
>  };
> -#endif
> diff --git a/net/openvswitch/vport.c b/net/openvswitch/vport.c
> index ba81294..ba240a8 100644
> --- a/net/openvswitch/vport.c
> +++ b/net/openvswitch/vport.c
> @@ -38,10 +38,7 @@
>  static const struct vport_ops *vport_ops_list[] = {
>  	&ovs_netdev_vport_ops,
>  	&ovs_internal_vport_ops,
> -
> -#if IS_ENABLED(CONFIG_NET_IPGRE_DEMUX)
>  	&ovs_gre_vport_ops,
> -#endif
>  };
>  
>  /* Protected by RCU read lock for reading, ovs_mutex for writing. */
> 


-- 
~Randy
--
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