event: Add return code to spdk_rpc_initialize

This is an internal API used in several places. The call can fail, so
make sure it can report that correctly.

Change-Id: Iac0ed2c8299c9dd3d2556070278a2224c3807b7b
Signed-off-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/6640
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: <dongx.yi@intel.com>
Reviewed-by: Aleksey Marchuk <alexeymar@mellanox.com>
Reviewed-by: Tomasz Zawadzki <tomasz.zawadzki@intel.com>
Reviewed-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>

examples/nvmf/nvmf/nvmf.c

@@ -711,7 +711,13 @@ static void
 nvmf_subsystem_init_done(int rc, void *cb_arg)
 {
 	fprintf(stdout, "bdev subsystem init successfully\n");
-	spdk_rpc_initialize(g_rpc_addr);
+
+	rc = spdk_rpc_initialize(g_rpc_addr);
+	if (rc) {
+		spdk_app_stop(rc);
+		return;
+	}
+
 	spdk_rpc_set_state(SPDK_RPC_RUNTIME);
 
 	g_target_state = NVMF_INIT_TARGET;

include/spdk_internal/event.h

@@ -214,7 +214,7 @@ void spdk_app_json_config_load(const char *json_config_file, const char *rpc_add
  */
 void spdk_subsystem_config_json(struct spdk_json_write_ctx *w, struct spdk_subsystem *subsystem);
 
-void spdk_rpc_initialize(const char *listen_addr);
+int spdk_rpc_initialize(const char *listen_addr);
 void spdk_rpc_finish(void);
 
 struct spdk_governor_capabilities {

lib/event/app.c

@@ -278,7 +278,12 @@ app_start_rpc(int rc, void *arg1)
 		return;
 	}
 
-	spdk_rpc_initialize(g_spdk_app.rpc_addr);
+	rc = spdk_rpc_initialize(g_spdk_app.rpc_addr);
+	if (rc) {
+		spdk_app_stop(rc);
+		return;
+	}
+
 	if (!g_delay_subsystem_init) {
 		spdk_rpc_set_state(SPDK_RPC_RUNTIME);
 		app_start_application();
@@ -393,6 +398,8 @@ app_setup_trace(struct spdk_app_opts *opts)
 static void
 bootstrap_fn(void *arg1)
 {
+	int rc;
+
 	if (g_spdk_app.json_config_file) {
 		g_delay_subsystem_init = false;
 		spdk_app_json_config_load(g_spdk_app.json_config_file, g_spdk_app.rpc_addr, app_start_rpc,
@@ -401,7 +408,11 @@ bootstrap_fn(void *arg1)
 		if (!g_delay_subsystem_init) {
 			spdk_subsystem_init(app_start_rpc, NULL);
 		} else {
-			spdk_rpc_initialize(g_spdk_app.rpc_addr);
+			rc = spdk_rpc_initialize(g_spdk_app.rpc_addr);
+			if (rc) {
+				spdk_app_stop(rc);
+				return;
+			}
 		}
 	}
 }

lib/event/json_config.c

@@ -614,8 +614,11 @@ spdk_app_json_config_load(const char *json_config_file, const char *rpc_addr,
 		goto fail;
 	}
 
-	/* FIXME: spdk_rpc_initialize() function should return error code. */
+	rc = spdk_rpc_initialize(ctx->rpc_socket_path_temp);
-	spdk_rpc_initialize(ctx->rpc_socket_path_temp);
+	if (rc) {
+		goto fail;
+	}
+
 	ctx->client_conn = spdk_jsonrpc_client_connect(ctx->rpc_socket_path_temp, AF_UNIX);
 	if (ctx->client_conn == NULL) {
 		SPDK_ERRLOG("Failed to connect to '%s'\n", ctx->rpc_socket_path_temp);

lib/event/rpc.c

@@ -51,31 +51,35 @@ rpc_subsystem_poll(void *arg)
 	return SPDK_POLLER_BUSY;
 }
 
-void
+int
 spdk_rpc_initialize(const char *listen_addr)
 {
 	int rc;
 
 	if (listen_addr == NULL) {
-		return;
+		/* Not treated as an error */
+		return 0;
 	}
 
 	if (!spdk_rpc_verify_methods()) {
-		spdk_app_stop(-EINVAL);
+		return -EINVAL;
-		return;
 	}
 
 	/* Listen on the requested address */
 	rc = spdk_rpc_listen(listen_addr);
 	if (rc != 0) {
 		SPDK_ERRLOG("Unable to start RPC service at %s\n", listen_addr);
-		return;
+		/* TODO: Eventually, treat this as an error. But it historically has not
+		 * been and many tests rely on this gracefully failing. */
+		return 0;
 	}
 
 	spdk_rpc_set_state(SPDK_RPC_STARTUP);
 
 	/* Register a poller to periodically check for RPCs */
 	g_rpc_poller = SPDK_POLLER_REGISTER(rpc_subsystem_poll, NULL, RPC_SELECT_INTERVAL);
+
+	return 0;
 }
 
 void

test/unit/lib/event/app.c/app_ut.c

@@ -49,7 +49,7 @@ DEFINE_STUB_V(spdk_rpc_register_method, (const char *method, spdk_rpc_method_han
 DEFINE_STUB_V(spdk_rpc_register_alias_deprecated, (const char *method, const char *alias));
 DEFINE_STUB_V(spdk_rpc_set_state, (uint32_t state));
 DEFINE_STUB(spdk_rpc_get_state, uint32_t, (void), SPDK_RPC_RUNTIME);
-DEFINE_STUB_V(spdk_rpc_initialize, (const char *listen_addr));
+DEFINE_STUB(spdk_rpc_initialize, int, (const char *listen_addr), 0);
 DEFINE_STUB_V(spdk_rpc_finish, (void));
 DEFINE_STUB_V(spdk_app_json_config_load, (const char *json_config_file, const char *rpc_addr,
 		spdk_subsystem_init_fn cb_fn, void *cb_arg, bool stop_on_error));