components/esp_netif/lwip/netif/esp_pbuf_ref.c (ESP-IDF)

/* * 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; }