netdev - Re: [PATCH net-next v2 5/9] net: openvswitch: add emit

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Date: Wed, 5 Jun 2024 19:31:55 +0000
From: Adrián Moreno <amorenoz@...hat.com>
To: kernel test robot <lkp@...el.com>
Cc: netdev@...r.kernel.org, llvm@...ts.linux.dev, 
	oe-kbuild-all@...ts.linux.dev, aconole@...hat.com, echaudro@...hat.com, 
	horms@...nel.org, i.maximets@....org, dev@...nvswitch.org, 
	Donald Hunter <donald.hunter@...il.com>, Jakub Kicinski <kuba@...nel.org>, 
	Eric Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>, 
	Pravin B Shelar <pshelar@....org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next v2 5/9] net: openvswitch: add emit_sample action

On Wed, Jun 05, 2024 at 08:29:22AM GMT, kernel test robot wrote:
> Hi Adrian,
>
> kernel test robot noticed the following build errors:
>
> [auto build test ERROR on net-next/main]
>
> url:    https://github.com/intel-lab-lkp/linux/commits/Adrian-Moreno/net-psample-add-user-cookie/20240604-030055
> base:   net-next/main
> patch link:    https://lore.kernel.org/r/20240603185647.2310748-6-amorenoz%40redhat.com
> patch subject: [PATCH net-next v2 5/9] net: openvswitch: add emit_sample action
> config: s390-randconfig-002-20240605 (https://download.01.org/0day-ci/archive/20240605/202406050852.hDtfskO0-lkp@intel.com/config)
> compiler: clang version 19.0.0git (https://github.com/llvm/llvm-project d7d2d4f53fc79b4b58e8d8d08151b577c3699d4a)
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240605/202406050852.hDtfskO0-lkp@intel.com/reproduce)
>
> If you fix the issue in a separate patch/commit (i.e. not just a new version of
> the same patch/commit), kindly add following tags
> | Reported-by: kernel test robot <lkp@...el.com>
> | Closes: https://lore.kernel.org/oe-kbuild-all/202406050852.hDtfskO0-lkp@intel.com/
>
> All errors (new ones prefixed by >>):
>
>    s390x-linux-ld: net/openvswitch/actions.o: in function `do_execute_actions':
> >> actions.c:(.text+0x1d5c): undefined reference to `psample_sample_packet'
>

Thanks robot!

OK, I think I know what's wrong. There is an optional dependency with
PSAMPLE. Openvswitch module does compile without PSAMPLE but there is a
link error if OPENVSWITCH=y and PSAMPLE=m.

Looking into how to express this in the Kconfig, I'm planning to add the
following to the next version of the series.

diff --git a/net/openvswitch/Kconfig b/net/openvswitch/Kconfig
index 29a7081858cd..2535f3f9f462 100644
--- a/net/openvswitch/Kconfig
+++ b/net/openvswitch/Kconfig
@@ -10,6 +10,7 @@ config OPENVSWITCH
 		   (NF_CONNTRACK && ((!NF_DEFRAG_IPV6 || NF_DEFRAG_IPV6) && \
 				     (!NF_NAT || NF_NAT) && \
 				     (!NETFILTER_CONNCOUNT || NETFILTER_CONNCOUNT)))
+	depends on PSAMPLE || !PSAMPLE
 	select LIBCRC32C
 	select MPLS
 	select NET_MPLS_GSO