1 /*
2 * SPDX-FileCopyrightText: 2021-2022 Espressif Systems (Shanghai) CO LTD
3 *
4 * SPDX-License-Identifier: Apache-2.0
5 */
6 /**
7 * @file esp_pbuf reference
8 * This file handles lwip custom pbufs interfacing with esp_netif
9 * and the L2 free function esp_netif_free_rx_buffer()
10 */
11
12 #include "lwip/mem.h"
13 #include "lwip/esp_pbuf_ref.h"
14 #include "esp_netif_net_stack.h"
15
16 /**
17 * @brief Specific pbuf structure for pbufs allocated by ESP netif
18 * of PBUF_REF type
19 */
20 typedef struct esp_custom_pbuf
21 {
22 struct pbuf_custom p;
23 esp_netif_t *esp_netif;
24 void* l2_buf;
25 } esp_custom_pbuf_t;
26
27 /**
28 * @brief Free custom pbuf containing the L2 layer buffer allocated in the driver
29 *
30 * @param pbuf Custom pbuf holding the packet passed to lwip input
31 * @note This function called as a custom_free_function() upon pbuf_free()
32 */
esp_pbuf_free(struct pbuf * pbuf)33 static void esp_pbuf_free(struct pbuf *pbuf)
34 {
35 esp_custom_pbuf_t* esp_pbuf = (esp_custom_pbuf_t*)pbuf;
36 esp_netif_free_rx_buffer(esp_pbuf->esp_netif, esp_pbuf->l2_buf);
37 mem_free(pbuf);
38 }
39
40 /**
41 * @brief Allocate custom pbuf for supplied sp_netif
42 * @param esp_netif esp-netif handle
43 * @param buffer Buffer to allocate
44 * @param len Size of the buffer
45 * @param l2_buff External l2 buffe
46 * @return Custom pbuf pointer on success; NULL if no free heap
47 */
esp_pbuf_allocate(esp_netif_t * esp_netif,void * buffer,size_t len,void * l2_buff)48 struct pbuf* esp_pbuf_allocate(esp_netif_t *esp_netif, void *buffer, size_t len, void *l2_buff)
49 {
50 struct pbuf *p;
51
52 esp_custom_pbuf_t* esp_pbuf = mem_malloc(sizeof(esp_custom_pbuf_t));
53 if (esp_pbuf == NULL) {
54 return NULL;
55 }
56 esp_pbuf->p.custom_free_function = esp_pbuf_free;
57 esp_pbuf->esp_netif = esp_netif;
58 esp_pbuf->l2_buf = l2_buff;
59 p = pbuf_alloced_custom(PBUF_RAW, len, PBUF_REF, &esp_pbuf->p, buffer, len);
60 if (p == NULL) {
61 mem_free(esp_pbuf);
62 return NULL;
63 }
64 return p;
65 }
66
