00_lwip_底层网卡接收到一帧数据的递交流程

1.中断函数中接收一帧数据

void ETH_IRQHandler(void)
{
    if (ethernet_get_eth_rx_size(g_eth_handler.RxDesc))
    {
        lwip_pkt_handle();                                              /* 处理以太网数据，即将数据提交给LWIP */
    }

    __HAL_ETH_DMA_CLEAR_IT(&g_eth_handler, ETH_DMA_IT_NIS);             /* 清除DMA中断标志位 */
    __HAL_ETH_DMA_CLEAR_IT(&g_eth_handler, ETH_DMA_IT_R);               /* 清除DMA接收中断标志位 */
}

调用函数，从以太网的句柄的接收描述符中获得接收数据的长度；

然后处理数据包：llwip_pkt_handle()

2.处理数据包函数调用网络接口的input函数处理数据包

void lwip_pkt_handle(void)
{
    /* 从网络缓冲区中读取接收到的数据包并将其发送给LWIP处理 */
    ethernetif_input(&g_lwip_netif);
}

3.网络接口输入处理函数调用底层处理函数

/**
 * This function should be called when a packet is ready to be read
 * from the interface. It uses the function low_level_input() that
 * should handle the actual reception of bytes from the network
 * interface. Then the type of the received packet is determined and
 * the appropriate input function is called.
 *
 * @param netif the lwip network interface structure for this ethernetif
 */
void
ethernetif_input(struct netif *netif)
{
    struct pbuf *p;

    /* move received packet into a new pbuf */
    p = low_level_input(netif);
    /* if no packet could be read, silently ignore this */
    if (p != NULL)
    {
        /* pass all packets to ethernet_input, which decides what packets it supports */
        if (netif->input(p, netif) != ERR_OK)
        {
            LWIP_DEBUGF(NETIF_DEBUG, ("ethernetif_input: IP input error\n"));
            pbuf_free(p);
            p = NULL;
        }
    }

} 

底层输入处理函数，处理后获得一个网络数据包的指针p；

将数据包指针p,和网络接口，传递给网络接口的输入处理函数中，解析处理数据包；

4.网络接口挂架的回调函数处理获得数据包

/**
 * @ingroup lwip_nosys
 * Process received ethernet frames. Using this function instead of directly
 * calling ip_input and passing ARP frames through etharp in ethernetif_input,
 * the ARP cache is protected from concurrent access.\n
 * Don't call directly, pass to netif_add() and call netif->input().
 *
 * @param p the received packet, p->payload pointing to the ethernet header
 * @param netif the network interface on which the packet was received
 *
 * @see LWIP_HOOK_UNKNOWN_ETH_PROTOCOL
 * @see ETHARP_SUPPORT_VLAN
 * @see LWIP_HOOK_VLAN_CHECK
 */
err_t
ethernet_input(struct pbuf *p, struct netif *netif)
{
  struct eth_hdr *ethhdr;
  u16_t type;
#if LWIP_ARP || ETHARP_SUPPORT_VLAN || LWIP_IPV6
  u16_t next_hdr_offset = SIZEOF_ETH_HDR;
#endif /* LWIP_ARP || ETHARP_SUPPORT_VLAN */

  LWIP_ASSERT_CORE_LOCKED();

  if (p->len <= SIZEOF_ETH_HDR) {
    /* a packet with only an ethernet header (or less) is not valid for us */
    ETHARP_STATS_INC(etharp.proterr);
    ETHARP_STATS_INC(etharp.drop);
    MIB2_STATS_NETIF_INC(netif, ifinerrors);
    goto free_and_return;
  }

  if (p->if_idx == NETIF_NO_INDEX) {
    p->if_idx = netif_get_index(netif);
  }

  /* points to packet payload, which starts with an Ethernet header */
  ethhdr = (struct eth_hdr *)p->payload;
  LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE,
              ("ethernet_input: dest:%"X8_F":%"X8_F":%"X8_F":%"X8_F":%"X8_F":%"X8_F", src:%"X8_F":%"X8_F":%"X8_F":%"X8_F":%"X8_F":%"X8_F", type:%"X16_F"\n",
               (unsigned char)ethhdr->dest.addr[0], (unsigned char)ethhdr->dest.addr[1], (unsigned char)ethhdr->dest.addr[2],
               (unsigned char)ethhdr->dest.addr[3], (unsigned char)ethhdr->dest.addr[4], (unsigned char)ethhdr->dest.addr[5],
               (unsigned char)ethhdr->src.addr[0],  (unsigned char)ethhdr->src.addr[1],  (unsigned char)ethhdr->src.addr[2],
               (unsigned char)ethhdr->src.addr[3],  (unsigned char)ethhdr->src.addr[4],  (unsigned char)ethhdr->src.addr[5],
               lwip_htons(ethhdr->type)));

  type = ethhdr->type;
#if ETHARP_SUPPORT_VLAN
  if (type == PP_HTONS(ETHTYPE_VLAN)) {
    struct eth_vlan_hdr *vlan = (struct eth_vlan_hdr *)(((char *)ethhdr) + SIZEOF_ETH_HDR);
    next_hdr_offset = SIZEOF_ETH_HDR + SIZEOF_VLAN_HDR;
    if (p->len <= SIZEOF_ETH_HDR + SIZEOF_VLAN_HDR) {
      /* a packet with only an ethernet/vlan header (or less) is not valid for us */
      ETHARP_STATS_INC(etharp.proterr);
      ETHARP_STATS_INC(etharp.drop);
      MIB2_STATS_NETIF_INC(netif, ifinerrors);
      goto free_and_return;
    }
#if defined(LWIP_HOOK_VLAN_CHECK) || defined(ETHARP_VLAN_CHECK) || defined(ETHARP_VLAN_CHECK_FN) /* if not, allow all VLANs */
#ifdef LWIP_HOOK_VLAN_CHECK
    if (!LWIP_HOOK_VLAN_CHECK(netif, ethhdr, vlan)) {
#elif defined(ETHARP_VLAN_CHECK_FN)
    if (!ETHARP_VLAN_CHECK_FN(ethhdr, vlan)) {
#elif defined(ETHARP_VLAN_CHECK)
    if (VLAN_ID(vlan) != ETHARP_VLAN_CHECK) {
#endif
      /* silently ignore this packet: not for our VLAN */
      pbuf_free(p);
      return ERR_OK;
    }
#endif /* defined(LWIP_HOOK_VLAN_CHECK) || defined(ETHARP_VLAN_CHECK) || defined(ETHARP_VLAN_CHECK_FN) */
    type = vlan->tpid;
  }
#endif /* ETHARP_SUPPORT_VLAN */

#if LWIP_ARP_FILTER_NETIF
  netif = LWIP_ARP_FILTER_NETIF_FN(p, netif, lwip_htons(type));
#endif /* LWIP_ARP_FILTER_NETIF*/

  if (ethhdr->dest.addr[0] & 1) {
    /* this might be a multicast or broadcast packet */
    if (ethhdr->dest.addr[0] == LL_IP4_MULTICAST_ADDR_0) {
#if LWIP_IPV4
      if ((ethhdr->dest.addr[1] == LL_IP4_MULTICAST_ADDR_1) &&
          (ethhdr->dest.addr[2] == LL_IP4_MULTICAST_ADDR_2)) {
        /* mark the pbuf as link-layer multicast */
        p->flags |= PBUF_FLAG_LLMCAST;
      }
#endif /* LWIP_IPV4 */
    }
#if LWIP_IPV6
    else if ((ethhdr->dest.addr[0] == LL_IP6_MULTICAST_ADDR_0) &&
             (ethhdr->dest.addr[1] == LL_IP6_MULTICAST_ADDR_1)) {
      /* mark the pbuf as link-layer multicast */
      p->flags |= PBUF_FLAG_LLMCAST;
    }
#endif /* LWIP_IPV6 */
    else if (eth_addr_cmp(ðhdr->dest, ðbroadcast)) {
      /* mark the pbuf as link-layer broadcast */
      p->flags |= PBUF_FLAG_LLBCAST;
    }
  }

  switch (type) {
#if LWIP_IPV4 && LWIP_ARP
    /* IP packet? */
    case PP_HTONS(ETHTYPE_IP):
      if (!(netif->flags & NETIF_FLAG_ETHARP)) {
        goto free_and_return;
      }
      /* skip Ethernet header (min. size checked above) */
      if (pbuf_remove_header(p, next_hdr_offset)) {
        LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING,
                    ("ethernet_input: IPv4 packet dropped, too short (%"U16_F"/%"U16_F")\n",
                     p->tot_len, next_hdr_offset));
        LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("Can't move over header in packet"));
        goto free_and_return;
      } else {
        /* pass to IP layer */
        ip4_input(p, netif);
      }
      break;

    case PP_HTONS(ETHTYPE_ARP):
      if (!(netif->flags & NETIF_FLAG_ETHARP)) {
        goto free_and_return;
      }
      /* skip Ethernet header (min. size checked above) */
      if (pbuf_remove_header(p, next_hdr_offset)) {
        LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING,
                    ("ethernet_input: ARP response packet dropped, too short (%"U16_F"/%"U16_F")\n",
                     p->tot_len, next_hdr_offset));
        LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("Can't move over header in packet"));
        ETHARP_STATS_INC(etharp.lenerr);
        ETHARP_STATS_INC(etharp.drop);
        goto free_and_return;
      } else {
        /* pass p to ARP module */
        etharp_input(p, netif);
      }
      break;
#endif /* LWIP_IPV4 && LWIP_ARP */
#if PPPOE_SUPPORT
    case PP_HTONS(ETHTYPE_PPPOEDISC): /* PPP Over Ethernet Discovery Stage */
      pppoe_disc_input(netif, p);
      break;

    case PP_HTONS(ETHTYPE_PPPOE): /* PPP Over Ethernet Session Stage */
      pppoe_data_input(netif, p);
      break;
#endif /* PPPOE_SUPPORT */

#if LWIP_IPV6
    case PP_HTONS(ETHTYPE_IPV6): /* IPv6 */
      /* skip Ethernet header */
      if ((p->len < next_hdr_offset) || pbuf_remove_header(p, next_hdr_offset)) {
        LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING,
                    ("ethernet_input: IPv6 packet dropped, too short (%"U16_F"/%"U16_F")\n",
                     p->tot_len, next_hdr_offset));
        goto free_and_return;
      } else {
        /* pass to IPv6 layer */
        ip6_input(p, netif);
      }
      break;
#endif /* LWIP_IPV6 */

    default:
#ifdef LWIP_HOOK_UNKNOWN_ETH_PROTOCOL
      if (LWIP_HOOK_UNKNOWN_ETH_PROTOCOL(p, netif) == ERR_OK) {
        break;
      }
#endif
      ETHARP_STATS_INC(etharp.proterr);
      ETHARP_STATS_INC(etharp.drop);
      MIB2_STATS_NETIF_INC(netif, ifinunknownprotos);
      goto free_and_return;
  }

  /* This means the pbuf is freed or consumed,
     so the caller doesn't have to free it again */
  return ERR_OK;

free_and_return:
  pbuf_free(p);
  return ERR_OK;
}