vcl: add config option for preferred tls engine

Type: feature

Change-Id: If6c095c9b737cb524a9232dcfa9be0f93f04d114
Signed-off-by: Florin Coras <fcoras@cisco.com>

src/vcl/vcl_bapi.c

@@ -360,11 +360,14 @@ void
 vppcom_app_send_attach (void)
 {
   vcl_worker_t *wrk = vcl_worker_get_current ();
+  u8 tls_engine = CRYPTO_ENGINE_OPENSSL;
   vl_api_app_attach_t *bmp;
   u8 nsid_len = vec_len (vcm->cfg.namespace_id);
   u8 app_is_proxy = (vcm->cfg.app_proxy_transport_tcp ||
 		     vcm->cfg.app_proxy_transport_udp);
 
+  tls_engine = vcm->cfg.tls_engine ? vcm->cfg.tls_engine : tls_engine;
+
   bmp = vl_msg_api_alloc (sizeof (*bmp));
   memset (bmp, 0, sizeof (*bmp));
 
@@ -387,7 +390,7 @@ vppcom_app_send_attach (void)
   bmp->options[APP_OPTIONS_PREALLOC_FIFO_PAIRS] =
     vcm->cfg.preallocated_fifo_pairs;
   bmp->options[APP_OPTIONS_EVT_QUEUE_SIZE] = vcm->cfg.event_queue_size;
-  bmp->options[APP_OPTIONS_TLS_ENGINE] = CRYPTO_ENGINE_OPENSSL;
+  bmp->options[APP_OPTIONS_TLS_ENGINE] = tls_engine;
   if (nsid_len)
     {
       bmp->namespace_id_len = nsid_len;

src/vcl/vcl_cfg.c

@@ -499,6 +499,12 @@ vppcom_cfg_read_file (char *conf_fname)
 	      VCFG_DBG (0, "VCL<%d>: configured with mq with eventfd",
 			getpid ());
 	    }
+	  else if (unformat (line_input, "tls-engine %u",
+			     &vcl_cfg->tls_engine))
+	    {
+	      VCFG_DBG (0, "VCL<%d>: configured tls-engine %u (0x%x)",
+			getpid (), vcl_cfg->tls_engine, vcl_cfg->tls_engine);
+	    }
 	  else if (unformat (line_input, "}"))
 	    {
 	      vc_cfg_input = 0;

src/vcl/vcl_private.h

@@ -211,6 +211,7 @@ typedef struct vppcom_cfg_t_
   char *event_log_path;
   u8 *vpp_api_filename;
   u8 *vpp_api_socket_name;
+  u32 tls_engine;
 } vppcom_cfg_t;
 
 void vppcom_cfg (vppcom_cfg_t * vcl_cfg);