lwip: Rename esp32 port layer to esp32xx

As it reflects all chips from esp32-xx family, not only esp32

components/lwip/port/esp32xx/netif/dhcp_state.c

@@ -0,0 +1,73 @@
+/*
+ * SPDX-FileCopyrightText: 2018-2022 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include "nvs.h"
+#include "lwip/dhcp.h"
+#include "lwip/netif.h"
+#include "netif/dhcp_state.h"
+
+#define DHCP_NAMESPACE "dhcp_state"
+#define IF_KEY_SIZE 3
+
+/*
+ * As a NVS key, use string representation of the interface index number
+ */
+static inline char *gen_if_key(struct netif *netif, char *name)
+{
+    lwip_itoa(name, IF_KEY_SIZE, netif->num);
+    return name;
+}
+
+bool dhcp_ip_addr_restore(struct netif *netif)
+{
+    nvs_handle_t nvs;
+    char if_key[IF_KEY_SIZE];
+    bool err = false;
+    if (netif == NULL) {
+        return false;
+    }
+    struct dhcp *dhcp = netif_dhcp_data(netif);
+
+    uint32_t *ip_addr = &dhcp->offered_ip_addr.addr;
+    if (nvs_open(DHCP_NAMESPACE, NVS_READONLY, &nvs) == ESP_OK) {
+        if (nvs_get_u32(nvs, gen_if_key(netif, if_key), ip_addr) == ESP_OK) {
+            err = true;
+        }
+        nvs_close(nvs);
+    }
+    return err;
+}
+
+void dhcp_ip_addr_store(struct netif *netif)
+{
+    nvs_handle_t nvs;
+    char if_key[IF_KEY_SIZE];
+    if (netif == NULL) {
+        return;
+    }
+    struct dhcp *dhcp = netif_dhcp_data(netif);
+    uint32_t ip_addr = dhcp->offered_ip_addr.addr;
+
+    if (nvs_open(DHCP_NAMESPACE, NVS_READWRITE, &nvs) == ESP_OK) {
+        nvs_set_u32(nvs, gen_if_key(netif, if_key), ip_addr);
+        nvs_commit(nvs);
+        nvs_close(nvs);
+    }
+}
+
+void dhcp_ip_addr_erase(struct netif *netif)
+{
+    nvs_handle_t nvs;
+    char if_key[IF_KEY_SIZE];
+    if (netif == NULL) {
+        return;
+    }
+    if (nvs_open(DHCP_NAMESPACE, NVS_READWRITE, &nvs) == ESP_OK) {
+        nvs_erase_key(nvs, gen_if_key(netif, if_key));
+        nvs_commit(nvs);
+        nvs_close(nvs);
+    }
+}