Re: [PATCH v2 net-next] sfc: do not try to call tc functions when CONFIG_SFC_SRIOV=n

[Martin Habets <habetsm.xilinx@gmail.com>]

On Thu, Jun 15, 2023 at 10:52:43PM +0100, edward.cree@amd.com wrote:
> From: Edward Cree <ecree.xilinx@gmail.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.
> Wrap the corresponding header files (tc_bindings.h, tc_encap_actions.h)
>  with #if IS_ENABLED(CONFIG_SFC_SRIOV), and add an #else with static
>  inline stubs for these two functions.
> 
> Reported-by: kernel test robot <lkp@intel.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@gmail.com>

Reviewed-by: Martin Habets <habetsm.xilinx@gmail.com>

> ---
>  drivers/net/ethernet/sfc/tc_bindings.h      | 12 ++++++++++++
>  drivers/net/ethernet/sfc/tc_encap_actions.h | 11 +++++++++++
>  2 files changed, 23 insertions(+)
> 
> diff --git a/drivers/net/ethernet/sfc/tc_bindings.h b/drivers/net/ethernet/sfc/tc_bindings.h
> index 095ddeb59eb3..a326d23d322b 100644
> --- a/drivers/net/ethernet/sfc/tc_bindings.h
> +++ b/drivers/net/ethernet/sfc/tc_bindings.h
> @@ -12,6 +12,7 @@
>  #define EFX_TC_BINDINGS_H
>  #include "net_driver.h"
>  
> +#if IS_ENABLED(CONFIG_SFC_SRIOV)
>  #include <net/sch_generic.h>
>  
>  struct efx_rep;
> @@ -28,4 +29,15 @@ int efx_tc_indr_setup_cb(struct net_device *net_dev, struct Qdisc *sch,
>  			 void (*cleanup)(struct flow_block_cb *block_cb));
>  int efx_tc_netdev_event(struct efx_nic *efx, unsigned long event,
>  			struct net_device *net_dev);
> +
> +#else /* CONFIG_SFC_SRIOV */
> +
> +static inline int efx_tc_netdev_event(struct efx_nic *efx, unsigned long event,
> +				      struct net_device *net_dev)
> +{
> +	return NOTIFY_DONE;
> +}
> +
> +#endif /* CONFIG_SFC_SRIOV */
> +
>  #endif /* EFX_TC_BINDINGS_H */
> diff --git a/drivers/net/ethernet/sfc/tc_encap_actions.h b/drivers/net/ethernet/sfc/tc_encap_actions.h
> index 4d755fb92daf..c3c7904ad7ff 100644
> --- a/drivers/net/ethernet/sfc/tc_encap_actions.h
> +++ b/drivers/net/ethernet/sfc/tc_encap_actions.h
> @@ -12,6 +12,7 @@
>  #define EFX_TC_ENCAP_ACTIONS_H
>  #include "net_driver.h"
>  
> +#if IS_ENABLED(CONFIG_SFC_SRIOV)
>  #include <linux/refcount.h>
>  #include <net/tc_act/tc_tunnel_key.h>
>  
> @@ -100,4 +101,14 @@ void efx_tc_unregister_egdev(struct efx_nic *efx, struct net_device *net_dev);
>  int efx_tc_netevent_event(struct efx_nic *efx, unsigned long event,
>  			  void *ptr);
>  
> +#else /* CONFIG_SFC_SRIOV */
> +
> +static inline int efx_tc_netevent_event(struct efx_nic *efx,
> +					unsigned long event, void *ptr)
> +{
> +	return NOTIFY_DONE;
> +}
> +
> +#endif /* CONFIG_SFC_SRIOV */
> +
>  #endif /* EFX_TC_ENCAP_ACTIONS_H */