lwip: Use custom pbufs for eth and wifi port/netif

components/lwip/port/esp32/include/netif/esp_pbuf_ref.h

@@ -0,0 +1,32 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2022 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+/**
+ * @file esp_pbuf reference interface file
+ */
+
+#ifndef __LWIP_ESP_PBUF_REF_H__
+#define __LWIP_ESP_PBUF_REF_H__
+
+#include <stddef.h>
+#include "lwip/pbuf.h"
+#include "esp_netif.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @brief Allocate custom pbuf containing pointer to a private l2-free function
+ *
+ * @note pbuf_free() will deallocate this custom pbuf and call the driver assigned free function
+ */
+struct pbuf* esp_pbuf_allocate(esp_netif_t *esp_netif, void *buffer, size_t len, void *l2_buff);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif //__LWIP_ESP_PBUF_REF_H__