esp-idf/components/esp_netif/lwip/netif/esp_pbuf_ref.c

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/*
* 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 "lwip/mem.h"
#include "lwip/esp_pbuf_ref.h"
#include "esp_netif_net_stack.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);
}
/**
* @brief Allocate custom pbuf for supplied sp_netif
* @param esp_netif esp-netif handle
* @param buffer Buffer to allocate
* @param len Size of the buffer
* @param l2_buff External l2 buffe
* @return Custom pbuf pointer on success; NULL if no free heap
*/
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;
}