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

components/lwip/port/esp32/netif/esp_pbuf_ref.c

@@ -0,0 +1,58 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2022 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+/**
+ * @file esp_pbuf reference
+ * This file handles lwip custom pbufs interfacing with esp_netif
+ * and the L2 free function esp_netif_free_rx_buffer()
+ */
+
+#include "netif/esp_pbuf_ref.h"
+#include "esp_netif_net_stack.h"
+#include "lwip/mem.h"
+
+/**
+ * @brief Specific pbuf structure for pbufs allocated by ESP netif
+ * of PBUF_REF type
+ */
+typedef struct esp_custom_pbuf
+{
+    struct pbuf_custom p;
+    esp_netif_t *esp_netif;
+    void* l2_buf;
+} esp_custom_pbuf_t;
+
+/**
+ * @brief Free custom pbuf containing the L2 layer buffer allocated in the driver
+ *
+ * @param pbuf Custom pbuf holding the packet passed to lwip input
+ * @note This function called as a custom_free_function() upon pbuf_free()
+ */
+static void esp_pbuf_free(struct pbuf *pbuf)
+{
+    esp_custom_pbuf_t* esp_pbuf = (esp_custom_pbuf_t*)pbuf;
+    esp_netif_free_rx_buffer(esp_pbuf->esp_netif, esp_pbuf->l2_buf);
+    mem_free(pbuf);
+}
+
+
+struct pbuf* esp_pbuf_allocate(esp_netif_t *esp_netif, void *buffer, size_t len, void *l2_buff)
+{
+    struct pbuf *p;
+
+    esp_custom_pbuf_t* esp_pbuf  = mem_malloc(sizeof(esp_custom_pbuf_t));
+    if (esp_pbuf == NULL) {
+        return NULL;
+    }
+    esp_pbuf->p.custom_free_function = esp_pbuf_free;
+    esp_pbuf->esp_netif = esp_netif;
+    esp_pbuf->l2_buf = l2_buff;
+    p = pbuf_alloced_custom(PBUF_RAW, len, PBUF_REF, &esp_pbuf->p, buffer, len);
+    if (p == NULL) {
+        mem_free(esp_pbuf);
+        return NULL;
+    }
+    return p;
+}