vcl: make eventfd flag configurable from env

Type: feature

Signed-off-by: Filip Tehlar <ftehlar@cisco.com>
Change-Id: Id25e2188c9167b2e187923ebe10660e0bc9c3c0a
diff --git a/src/vcl/vcl_cfg.c b/src/vcl/vcl_cfg.c
index 2ac9edd..4e0b583 100644
--- a/src/vcl/vcl_cfg.c
+++ b/src/vcl/vcl_cfg.c
@@ -591,6 +591,13 @@
       VCFG_DBG (0, "VCL<%d>: configured app-socket-api (%s)", getpid (),
 		vcl_cfg->vpp_app_socket_api);
     }
+  env_var_str = getenv (VPPCOM_ENV_APP_USE_MQ_EVENTFD);
+  if (env_var_str)
+    {
+      vcm->cfg.use_mq_eventfd = 1;
+      VCFG_DBG (0, "VCL<%d>: configured " VPPCOM_ENV_APP_USE_MQ_EVENTFD,
+		getpid ());
+    }
 }
 
 /*
diff --git a/src/vcl/vppcom.h b/src/vcl/vppcom.h
index 46517ad..c50850c 100644
--- a/src/vcl/vppcom.h
+++ b/src/vcl/vppcom.h
@@ -42,6 +42,7 @@
 #define VPPCOM_ENV_APP_NAMESPACE_SECRET      	"VCL_APP_NAMESPACE_SECRET"
 #define VPPCOM_ENV_APP_SCOPE_LOCAL           	"VCL_APP_SCOPE_LOCAL"
 #define VPPCOM_ENV_APP_SCOPE_GLOBAL          	"VCL_APP_SCOPE_GLOBAL"
+#define VPPCOM_ENV_APP_USE_MQ_EVENTFD		"VCL_APP_USE_MQ_EVENTFD"
 #define VPPCOM_ENV_VPP_API_SOCKET           	"VCL_VPP_API_SOCKET"
 #define VPPCOM_ENV_VPP_SAPI_SOCKET		"VCL_VPP_SAPI_SOCKET"