Merge pull request sonic-net#347 from yxieca/warmshut

[syncd] initiate warm shutdown when requested

Author: yxieca

syncd/syncd.cpp

@@ -3528,12 +3528,12 @@ int syncd_main(int argc, char **argv)
 
     SWSS_LOG_NOTICE("syncd started");
 
-    syncd_restart_type_t restartType = SYNCD_RESTART_TYPE_COLD;
+    syncd_restart_type_t shutdownType = SYNCD_RESTART_TYPE_COLD;
 
     try
     {
         SWSS_LOG_NOTICE("before onSyncdStart");
-        onSyncdStart(options.startType == SAI_WARM_BOOT);
+        onSyncdStart(false);
         SWSS_LOG_NOTICE("after onSyncdStart");
 
         startNotificationsProcessingThread();
@@ -3565,7 +3565,7 @@ int syncd_main(int argc, char **argv)
                  * lead to unable to find some objects.
                  */
 
-                restartType = handleRestartQuery(*restartQuery);
+                shutdownType = handleRestartQuery(*restartQuery);
                 break;
             }
             else if (sel == flexCounter.get())
@@ -3589,7 +3589,10 @@ int syncd_main(int argc, char **argv)
         exit_and_notify(EXIT_FAILURE);
     }
 
-    if (restartType == SYNCD_RESTART_TYPE_WARM)
+    sai_switch_api_t *sai_switch_api = NULL;
+    sai_api_query(SAI_API_SWITCH, (void**)&sai_switch_api);
+
+    if (shutdownType == SYNCD_RESTART_TYPE_WARM)
     {
         const char *warmBootWriteFile = profile_get_value(0, SAI_KEY_WARM_BOOT_WRITE_FILE);
 
@@ -3599,17 +3602,33 @@ int syncd_main(int argc, char **argv)
         {
             SWSS_LOG_WARN("user requested warm shutdown but warmBootWriteFile is not specified, forcing cold shutdown");
 
-            restartType = SYNCD_RESTART_TYPE_COLD;
+            shutdownType = SYNCD_RESTART_TYPE_COLD;
+        }
+        else
+        {
+            SWSS_LOG_NOTICE("Warm Reboot requested, keeping data plane running");
+
+            sai_attribute_t attr;
+
+            attr.id = SAI_SWITCH_ATTR_RESTART_WARM;
+            attr.value.booldata = true;
+
+            status = sai_switch_api->set_switch_attribute(gSwitchId, &attr);
+
+            if (status != SAI_STATUS_SUCCESS)
+            {
+                SWSS_LOG_ERROR("Failed to set SAI_SWITCH_ATTR_RESTART_WARM=true: %s, fall back to cold restart",
+                        sai_serialize_status(status).c_str());
+                shutdownType = SYNCD_RESTART_TYPE_COLD;
+            }
         }
     }
 
     SWSS_LOG_NOTICE("Removing the switch gSwitchId=0x%lx", gSwitchId);
-    sai_switch_api_t *sai_switch_api = NULL;
-    sai_api_query(SAI_API_SWITCH, (void**)&sai_switch_api);
 
 #ifdef SAI_SWITCH_ATTR_UNINIT_DATA_PLANE_ON_REMOVAL
 
-    if (restartType == SYNCD_RESTART_TYPE_FAST)
+    if (shutdownType == SYNCD_RESTART_TYPE_FAST)
     {
         SWSS_LOG_NOTICE("Fast Reboot requested, keeping data plane running");