From 1cb4cd5ec6270f502ee3e9b24821c55ceacf226c Mon Sep 17 00:00:00 2001
From: xueyunfei <xueyunfei@espressif.com>
Date: Thu, 19 Mar 2020 11:24:06 +0800
Subject: [PATCH] optimization TCPv6 connect

---
 components/lwip/lwip                          | 2 +-
 components/lwip/port/esp32/include/lwipopts.h | 1 +
 components/lwip/port/esp32/netif/wlanif.c     | 6 ++++++
 3 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/components/lwip/lwip b/components/lwip/lwip
index da2740fa8..453b291c4 160000
--- a/components/lwip/lwip
+++ b/components/lwip/lwip
@@ -1 +1 @@
-Subproject commit da2740fa8d56b9b9e8a10602f38df1ea4dbd9b74
+Subproject commit 453b291c4c0752e05b585a62d32d8bb23e1538d7
diff --git a/components/lwip/port/esp32/include/lwipopts.h b/components/lwip/port/esp32/include/lwipopts.h
index 76cd4b080..8882c9c9e 100644
--- a/components/lwip/port/esp32/include/lwipopts.h
+++ b/components/lwip/port/esp32/include/lwipopts.h
@@ -777,6 +777,7 @@
 
 #define ESP_LWIP                        1
 #define ESP_LWIP_ARP                    1
+#define ESP_IPV6                        1
 #define ESP_PER_SOC_TCP_WND             0
 #define ESP_THREAD_SAFE                 1
 #define ESP_THREAD_SAFE_DEBUG           LWIP_DBG_OFF
diff --git a/components/lwip/port/esp32/netif/wlanif.c b/components/lwip/port/esp32/netif/wlanif.c
index 7c60b6934..ed5e13ed1 100644
--- a/components/lwip/port/esp32/netif/wlanif.c
+++ b/components/lwip/port/esp32/netif/wlanif.c
@@ -81,6 +81,12 @@ low_level_init(struct netif *netif)
 #endif
 #endif
 
+#if ESP_IPV6
+#if LWIP_IPV6 && LWIP_IPV6_MLD
+  netif->flags |= NETIF_FLAG_MLD6;
+#endif
+#endif
+
 #if !ESP_L2_TO_L3_COPY
   netif->l2_buffer_free_notify = esp_wifi_internal_free_rx_buffer;
 #endif