netdev - [PATCH net-next] sfc: do not try to call tc functions when CONFIG_SFC

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Date: Mon, 12 Jun 2023 21:54:28 +0100
From: <edward.cree@....com>
To: <linux-net-drivers@....com>, <davem@...emloft.net>, <kuba@...nel.org>,
	<pabeni@...hat.com>, <edumazet@...gle.com>
CC: Edward Cree <ecree.xilinx@...il.com>, <netdev@...r.kernel.org>,
	<habetsm.xilinx@...il.com>, <oe-kbuild-all@...ts.linux.dev>,
	<simon.horman@...igine.com>, kernel test robot <lkp@...el.com>
Subject: [PATCH net-next] sfc: do not try to call tc functions when CONFIG_SFC_SRIOV=n

From: Edward Cree <ecree.xilinx@...il.com>

Functions efx_tc_netdev_event and efx_tc_netevent_event do not exist
 in that case as object files tc_bindings.o and tc_encap_actions.o
 are not built, so the calls to them from ef100_netdev_event and
 ef100_netevent_event cause link errors.
Guard the relevant part of ef100_netdev_event with #ifdef, as well as
 the entire function ef100_netevent_event and the code that registers
 and unregisters the netevent notifier.
Also guard the includes of tc_bindings.h and tc_encap_actions.h into
 ef100_netdev.c, as the symbols from these headers are only available
 when the corresponding object files are built.

Reported-by: kernel test robot <lkp@...el.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202306102026.ISK5JfUQ-lkp@intel.com/
Fixes: 7e5e7d800011 ("sfc: neighbour lookup for TC encap action offload")
Signed-off-by: Edward Cree <ecree.xilinx@...il.com>
---
 drivers/net/ethernet/sfc/ef100_netdev.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/sfc/ef100_netdev.c b/drivers/net/ethernet/sfc/ef100_netdev.c
index 7f7d560cb2b4..3bb0442de7ea 100644
--- a/drivers/net/ethernet/sfc/ef100_netdev.c
+++ b/drivers/net/ethernet/sfc/ef100_netdev.c
@@ -23,8 +23,10 @@
 #include "mcdi_filters.h"
 #include "rx_common.h"
 #include "ef100_sriov.h"
+#ifdef CONFIG_SFC_SRIOV
 #include "tc_bindings.h"
 #include "tc_encap_actions.h"
+#endif
 #include "efx_devlink.h"
 
 static void ef100_update_name(struct efx_nic *efx)
@@ -301,22 +303,27 @@ int ef100_netdev_event(struct notifier_block *this,
 {
 	struct efx_nic *efx = container_of(this, struct efx_nic, netdev_notifier);
 	struct net_device *net_dev = netdev_notifier_info_to_dev(ptr);
+#ifdef CONFIG_SFC_SRIOV
 	struct ef100_nic_data *nic_data = efx->nic_data;
 	int err;
+#endif
 
 	if (efx->net_dev == net_dev &&
 	    (event == NETDEV_CHANGENAME || event == NETDEV_REGISTER))
 		ef100_update_name(efx);
 
+#ifdef CONFIG_SFC_SRIOV
 	if (!nic_data->grp_mae)
 		return NOTIFY_DONE;
 	err = efx_tc_netdev_event(efx, event, net_dev);
 	if (err & NOTIFY_STOP_MASK)
 		return err;
+#endif
 
 	return NOTIFY_DONE;
 }
 
+#ifdef CONFIG_SFC_SRIOV
 static int ef100_netevent_event(struct notifier_block *this,
 				unsigned long event, void *ptr)
 {
@@ -329,9 +336,9 @@ static int ef100_netevent_event(struct notifier_block *this,
 	err = efx_tc_netevent_event(efx, event, ptr);
 	if (err & NOTIFY_STOP_MASK)
 		return err;
-
 	return NOTIFY_DONE;
 };
+#endif
 
 static int ef100_register_netdev(struct efx_nic *efx)
 {
@@ -392,8 +399,8 @@ void ef100_remove_netdev(struct efx_probe_data *probe_data)
 	rtnl_unlock();
 
 	unregister_netdevice_notifier(&efx->netdev_notifier);
-	unregister_netevent_notifier(&efx->netevent_notifier);
 #if defined(CONFIG_SFC_SRIOV)
+	unregister_netevent_notifier(&efx->netevent_notifier);
 	if (!efx->type->is_vf)
 		efx_ef100_pci_sriov_disable(efx, true);
 #endif
@@ -513,6 +520,7 @@ int ef100_probe_netdev(struct efx_probe_data *probe_data)
 		goto fail;
 	}
 
+#ifdef CONFIG_SFC_SRIOV
 	efx->netevent_notifier.notifier_call = ef100_netevent_event;
 	rc = register_netevent_notifier(&efx->netevent_notifier);
 	if (rc) {
@@ -520,6 +528,7 @@ int ef100_probe_netdev(struct efx_probe_data *probe_data)
 			  "Failed to register netevent notifier, rc=%d\n", rc);
 		goto fail;
 	}
+#endif
 
 	efx_probe_devlink_unlock(efx);
 	return rc;