net/sfc/base: decorate libefx API functions

The decorators will be used in the future to mark libefx API
functions as __rte_internal.

Signed-off-by: Andrew Rybchenko <arybchenko@solarflare.com>
Reviewed-by: Andy Moreton <amoreton@solarflare.com>
Reviewed-by: Richard Houldsworth <rhouldsw@xilinx.com>

drivers/net/sfc/base/efx_check.h

@@ -9,6 +9,15 @@
 
 #include "efsys.h"
 
+/*
+ * LIBEFX_* defines may be used to put API functions into dedicated code
+ * section if required by driver development framework and conventions.
+ */
+
+#ifndef LIBEFX_API
+# error "LIBEFX_API must be defined"
+#endif
+
 /*
  * Check that the efsys.h header in client code has a valid combination of
  * EFSYS_OPT_xxx options.

drivers/net/sfc/base/efx_mcdi.h

@@ -74,6 +74,7 @@ efx_mcdi_ev_cpl(
 	__in		int errcode);
 
 #if EFSYS_OPT_MCDI_PROXY_AUTH
+LIBEFX_API
 extern	__checkReturn	efx_rc_t
 efx_mcdi_get_proxy_handle(
 	__in		efx_nic_t *enp,

drivers/net/sfc/efsys.h

@@ -32,6 +32,9 @@
 extern "C" {
 #endif
 
+/* No specific decorations required since all functions are local now */
+#define LIBEFX_API
+
 #define EFSYS_HAS_UINT64 1
 #define EFSYS_USE_UINT64 1
 #define EFSYS_HAS_SSE2_M128 1