852 lines
24 KiB
C
852 lines
24 KiB
C
/****************************************************************************
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* net/devif/devif_poll.c
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*
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* Copyright (C) 2007-2010, 2012, 2014, 2016-2019 Gregory Nutt. All rights
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* reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#ifdef CONFIG_NET
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#include <debug.h>
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#include <nuttx/clock.h>
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#include <nuttx/net/netconfig.h>
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#include <nuttx/net/netdev.h>
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#include <nuttx/net/net.h>
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#include "devif/devif.h"
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#include "arp/arp.h"
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#include "can/can.h"
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#include "tcp/tcp.h"
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#include "udp/udp.h"
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#include "pkt/pkt.h"
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#include "bluetooth/bluetooth.h"
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#include "ieee802154/ieee802154.h"
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#include "icmp/icmp.h"
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#include "igmp/igmp.h"
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#include "icmpv6/icmpv6.h"
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#include "mld/mld.h"
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#include "ipforward/ipforward.h"
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#include "sixlowpan/sixlowpan.h"
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/****************************************************************************
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* Private Types
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****************************************************************************/
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enum devif_packet_type
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{
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DEVIF_PKT = 0,
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DEVIF_ICMP,
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DEVIF_IGMP,
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DEVIF_TCP,
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DEVIF_UDP,
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DEVIF_ICMP6
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};
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: devif_packet_conversion
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*
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* Description:
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* Generic output conversion hook. Only needed for IEEE802.15.4 (and
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* other non-standard packet radios) for now but this is a point where
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* support for other conversions may be provided.
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*
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* TCP output comes through three different mechansims. Either from:
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*
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* 1. TCP socket output. For the case of TCP output to a radio,
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* the TCP output is caught in the socket send()/sendto() logic and
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* redirected to 6LoWPAN logic.
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* 2. TCP output from the TCP state machine. That will occur
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* during TCP packet processing by the TCP state meachine.
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* 3. TCP output resulting from TX or timer polling
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*
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* Cases 2 is handled here. Logic here detected if (1) an attempt
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* to return with d_len > 0 and (2) that the device is a radio
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* network driver. Under those conditions, 6LoWPAN logic will be called
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* to create the radio frames.
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*
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* All outgoing ICMPv6 messages come through one of two mechanisms:
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*
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* 1. The output from internal ICMPv6 message passing. These outgoing
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* messages will use device polling and will be handled here.
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* 2. ICMPv6 output resulting from TX or timer polling.
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*
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* Assumptions:
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* The network is locked.
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*
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****************************************************************************/
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#ifdef CONFIG_NET_6LOWPAN
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static void devif_packet_conversion(FAR struct net_driver_s *dev,
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enum devif_packet_type pkttype)
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{
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if (dev->d_len > 0)
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{
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/* Check if this is a device served by 6LoWPAN */
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if (dev->d_lltype == NET_LL_IEEE802154 ||
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dev->d_lltype == NET_LL_PKTRADIO)
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{
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FAR struct ipv6_hdr_s *ipv6 = (FAR struct ipv6_hdr_s *)dev->d_buf;
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#ifdef CONFIG_NET_IPv4
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if ((ipv6->vtc & IP_VERSION_MASK) != IPv6_VERSION)
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{
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nerr("ERROR: IPv6 version error: %02x... Packet dropped\n",
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ipv6->vtc);
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}
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else
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#endif
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#ifdef CONFIG_NET_TCP
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if (pkttype == DEVIF_TCP)
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{
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/* This packet came from a response to TCP polling and is
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* directed to an radio driver using 6LoWPAN. Verify that the
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* outgoing packet is IPv6 with TCP protocol.
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*/
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if (ipv6->proto == IP_PROTO_TCP)
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{
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/* Let 6LoWPAN convert IPv6 TCP output into radio frames. */
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sixlowpan_tcp_send(dev, dev, ipv6);
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}
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else
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{
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nerr("ERROR: TCP protocol error: %u... Packet dropped\n",
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ipv6->proto);
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}
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}
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else
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#endif
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#ifdef CONFIG_NET_ICMPv6
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if (pkttype == DEVIF_ICMP6)
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{
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/* This packet came from a response to ICMPv6 polling and is
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* directed to a radio using 6LoWPAN. Verify that the outgoing
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* packet is IPv6 with TCP protocol.
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*/
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if (ipv6->proto == IP_PROTO_ICMP6)
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{
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/* Let 6LoWPAN convert IPv6 ICMPv6 output into radio frames. */
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sixlowpan_icmpv6_send(dev, dev, ipv6);
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}
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else
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{
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nerr("ERROR: ICMPv6 protocol error: %u... Packet dropped\n",
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ipv6->proto);
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}
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}
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else
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#endif
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{
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nerr("ERROR: Unhandled packet dropped. pkttype=%u protocol=%u\n",
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pkttype, ipv6->proto);
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}
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UNUSED(ipv6);
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dev->d_len = 0;
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}
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}
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}
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#else
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# define devif_packet_conversion(dev,pkttype)
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#endif /* CONFIG_NET_6LOWPAN */
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/****************************************************************************
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* Name: devif_poll_pkt_connections
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*
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* Description:
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* Poll all packet connections for available packets to send.
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*
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* Assumptions:
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* This function is called from the MAC device driver with the network
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* locked.
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*
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****************************************************************************/
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#ifdef CONFIG_NET_PKT
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static int devif_poll_pkt_connections(FAR struct net_driver_s *dev,
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devif_poll_callback_t callback)
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{
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FAR struct pkt_conn_s *pkt_conn = NULL;
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int bstop = 0;
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/* Traverse all of the allocated packet connections and perform the poll action */
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while (!bstop && (pkt_conn = pkt_nextconn(pkt_conn)))
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{
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/* Perform the packet TX poll */
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pkt_poll(dev, pkt_conn);
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/* Perform any necessary conversions on outgoing packets */
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devif_packet_conversion(dev, DEVIF_PKT);
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/* Call back into the driver */
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bstop = callback(dev);
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}
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return bstop;
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}
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#endif /* CONFIG_NET_PKT */
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/****************************************************************************
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* Name: devif_poll_pkt_connections
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*
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* Description:
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* Poll all packet connections for available packets to send.
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*
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* Assumptions:
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* This function is called from the MAC device driver with the network
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* locked.
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*
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****************************************************************************/
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#ifdef CONFIG_NET_CAN
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static int devif_poll_can_connections(FAR struct net_driver_s *dev,
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devif_poll_callback_t callback)
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{
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FAR struct can_conn_s *can_conn = NULL;
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int bstop = 0;
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/* Traverse all of the allocated packet connections and
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* perform the poll action
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*/
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while (!bstop && (can_conn = can_nextconn(can_conn)))
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{
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/* Perform the packet TX poll */
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can_poll(dev, can_conn);
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/* Call back into the driver */
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bstop = callback(dev);
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}
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return bstop;
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}
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#endif /* CONFIG_NET_PKT */
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/****************************************************************************
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* Name: devif_poll_bluetooth_connections
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*
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* Description:
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* Poll all packet connections for available packets to send.
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*
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* Assumptions:
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* This function is called from the MAC device driver with the network
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* locked.
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*
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****************************************************************************/
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#ifdef CONFIG_NET_BLUETOOTH
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static int devif_poll_bluetooth_connections(FAR struct net_driver_s *dev,
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devif_poll_callback_t callback)
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{
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FAR struct bluetooth_conn_s *bluetooth_conn = NULL;
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int bstop = 0;
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/* Traverse all of the allocated packet connections and perform the poll action */
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while (!bstop && (bluetooth_conn = bluetooth_conn_next(bluetooth_conn)))
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{
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/* Perform the packet TX poll */
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bluetooth_poll(dev, bluetooth_conn);
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/* Call back into the driver */
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bstop = callback(dev);
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}
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return bstop;
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}
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#endif /* CONFIG_NET_BLUETOOTH */
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/****************************************************************************
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* Name: devif_poll_ieee802154_connections
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*
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* Description:
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* Poll all packet connections for available packets to send.
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*
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* Assumptions:
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* This function is called from the MAC device driver with the network
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* locked.
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*
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****************************************************************************/
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#ifdef CONFIG_NET_IEEE802154
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static int devif_poll_ieee802154_connections(FAR struct net_driver_s *dev,
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devif_poll_callback_t callback)
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{
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FAR struct ieee802154_conn_s *ieee802154_conn = NULL;
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int bstop = 0;
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/* Traverse all of the allocated packet connections and perform the poll action */
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while (!bstop && (ieee802154_conn = ieee802154_conn_next(ieee802154_conn)))
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{
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/* Perform the packet TX poll */
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ieee802154_poll(dev, ieee802154_conn);
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/* Call back into the driver */
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bstop = callback(dev);
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}
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return bstop;
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}
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#endif /* CONFIG_NET_IEEE802154 */
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/****************************************************************************
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* Name: devif_poll_icmp
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*
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* Description:
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* Poll all of the connections waiting to send an ICMP ECHO request
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*
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****************************************************************************/
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#if defined(CONFIG_NET_ICMP) && defined(CONFIG_NET_ICMP_SOCKET)
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static inline int devif_poll_icmp(FAR struct net_driver_s *dev,
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devif_poll_callback_t callback)
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{
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FAR struct icmp_conn_s *conn = NULL;
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int bstop = 0;
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/* Traverse all of the allocated ICMP connections and perform the poll action */
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while (!bstop && (conn = icmp_nextconn(conn)) != NULL)
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{
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/* Perform the ICMP poll */
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icmp_poll(dev, conn);
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/* Perform any necessary conversions on outgoing packets */
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devif_packet_conversion(dev, DEVIF_ICMP);
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/* Call back into the driver */
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bstop = callback(dev);
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}
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return bstop;
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}
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#endif /* CONFIG_NET_ICMP && CONFIG_NET_ICMP_SOCKET */
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/****************************************************************************
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* Name: devif_poll_icmpv6
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*
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* Description:
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* Poll all of the connections waiting to send an ICMPv6 ECHO request
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*
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****************************************************************************/
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#if defined(CONFIG_NET_ICMPv6_SOCKET) || defined(CONFIG_NET_ICMPv6_NEIGHBOR)
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static inline int devif_poll_icmpv6(FAR struct net_driver_s *dev,
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devif_poll_callback_t callback)
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{
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FAR struct icmpv6_conn_s *conn = NULL;
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int bstop = 0;
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/* Traverse all of the allocated ICMPV6 connections and perform the poll action */
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do
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{
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/* Perform the ICMPV6 poll
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* Note: conn equal NULL in the first iteration means poll dev's callback list
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* since icmpv6_autoconfig and icmpv6_neighbor still append it's callback into
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* this list.
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*/
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icmpv6_poll(dev, conn);
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/* Perform any necessary conversions on outgoing packets */
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devif_packet_conversion(dev, DEVIF_ICMP6);
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/* Call back into the driver */
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bstop = callback(dev);
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}
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while (!bstop && (conn = icmpv6_nextconn(conn)) != NULL);
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return bstop;
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}
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#endif /* CONFIG_NET_ICMPv6_SOCKET || CONFIG_NET_ICMPv6_NEIGHBOR*/
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/****************************************************************************
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* Name: devif_poll_forward
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*
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* Description:
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* Poll the device event to see if any task is waiting to forward a packet.
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*
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****************************************************************************/
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#ifdef CONFIG_NET_IPFORWARD
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static inline int devif_poll_forward(FAR struct net_driver_s *dev,
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devif_poll_callback_t callback)
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{
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/* Perform the forwarding poll */
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ipfwd_poll(dev);
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/* NOTE: that 6LoWPAN packet conversions are handled differently for
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* forwarded packets. That is because we don't know what the packet
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* type is at this point; not within peeking into the device's d_buf.
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*/
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/* Call back into the driver */
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return callback(dev);
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}
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#endif /* CONFIG_NET_ICMPv6_SOCKET || CONFIG_NET_ICMPv6_NEIGHBOR*/
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/****************************************************************************
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* Name: devif_poll_igmp
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*
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* Description:
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* Poll all IGMP connections for available packets to send.
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*
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* Assumptions:
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* This function is called from the MAC device driver with the network
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* locked.
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*
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****************************************************************************/
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#ifdef CONFIG_NET_IGMP
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static inline int devif_poll_igmp(FAR struct net_driver_s *dev,
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devif_poll_callback_t callback)
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{
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/* Perform the IGMP TX poll */
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igmp_poll(dev);
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/* Perform any necessary conversions on outgoing packets */
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devif_packet_conversion(dev, DEVIF_IGMP);
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/* Call back into the driver */
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return callback(dev);
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}
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#endif /* CONFIG_NET_IGMP */
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/****************************************************************************
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* Name: devif_poll_mld
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*
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* Description:
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* Poll all MLD connections for available packets to send.
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*
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* Assumptions:
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* This function is called from the MAC device driver with the network
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* locked.
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*
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****************************************************************************/
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#ifdef CONFIG_NET_MLD
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static inline int devif_poll_mld(FAR struct net_driver_s *dev,
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devif_poll_callback_t callback)
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{
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/* Perform the MLD TX poll */
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mld_poll(dev);
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/* Perform any necessary conversions on outgoing ICMPv6 packets */
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devif_packet_conversion(dev, DEVIF_ICMP6);
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/* Call back into the driver */
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return callback(dev);
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}
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#endif /* CONFIG_NET_MLD */
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/****************************************************************************
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* Name: devif_poll_udp_connections
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*
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* Description:
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* Poll all UDP connections for available packets to send.
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*
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* Assumptions:
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* This function is called from the MAC device driver with the network
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* locked.
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*
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****************************************************************************/
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#ifdef NET_UDP_HAVE_STACK
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static int devif_poll_udp_connections(FAR struct net_driver_s *dev,
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devif_poll_callback_t callback)
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{
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FAR struct udp_conn_s *conn = NULL;
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int bstop = 0;
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/* Traverse all of the allocated UDP connections and perform the poll action */
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while (!bstop && (conn = udp_nextconn(conn)))
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{
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/* Perform the UDP TX poll */
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udp_poll(dev, conn);
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/* Perform any necessary conversions on outgoing packets */
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devif_packet_conversion(dev, DEVIF_UDP);
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/* Call back into the driver */
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bstop = callback(dev);
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}
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return bstop;
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}
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#endif /* NET_UDP_HAVE_STACK */
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/****************************************************************************
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* Name: devif_poll_tcp_connections
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*
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* Description:
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* Poll all UDP connections for available packets to send.
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*
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* Assumptions:
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* This function is called from the MAC device driver with the network
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* locked.
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*
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****************************************************************************/
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#ifdef NET_TCP_HAVE_STACK
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static inline int devif_poll_tcp_connections(FAR struct net_driver_s *dev,
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devif_poll_callback_t callback)
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{
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FAR struct tcp_conn_s *conn = NULL;
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int bstop = 0;
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|
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/* Traverse all of the active TCP connections and perform the poll action */
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while (!bstop && (conn = tcp_nextconn(conn)))
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{
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/* Perform the TCP TX poll */
|
|
|
|
tcp_poll(dev, conn);
|
|
|
|
/* Perform any necessary conversions on outgoing packets */
|
|
|
|
devif_packet_conversion(dev, DEVIF_TCP);
|
|
|
|
/* Call back into the driver */
|
|
|
|
bstop = callback(dev);
|
|
}
|
|
|
|
return bstop;
|
|
}
|
|
#else
|
|
# define devif_poll_tcp_connections(dev, callback) (0)
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Name: devif_poll_tcp_timer
|
|
*
|
|
* Description:
|
|
* The TCP timer has expired. Update TCP timing state in each active,
|
|
* TCP connection.
|
|
*
|
|
* Assumptions:
|
|
* This function is called from the MAC device driver with the network
|
|
* locked.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifdef NET_TCP_HAVE_STACK
|
|
static inline int devif_poll_tcp_timer(FAR struct net_driver_s *dev,
|
|
devif_poll_callback_t callback,
|
|
int hsec)
|
|
{
|
|
FAR struct tcp_conn_s *conn = NULL;
|
|
int bstop = 0;
|
|
|
|
/* Traverse all of the active TCP connections and perform the poll action. */
|
|
|
|
while (!bstop && (conn = tcp_nextconn(conn)))
|
|
{
|
|
/* Perform the TCP timer poll */
|
|
|
|
tcp_timer(dev, conn, hsec);
|
|
|
|
/* Perform any necessary conversions on outgoing packets */
|
|
|
|
devif_packet_conversion(dev, DEVIF_TCP);
|
|
|
|
/* Call back into the driver */
|
|
|
|
bstop = callback(dev);
|
|
}
|
|
|
|
return bstop;
|
|
}
|
|
#else
|
|
# define devif_poll_tcp_timer(dev, callback, hsec) (0)
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: devif_poll
|
|
*
|
|
* Description:
|
|
* This function will traverse each active network connection structure and
|
|
* will perform network polling operations. devif_poll() may be called
|
|
* asynchronously with the network driver can accept another outgoing
|
|
* packet.
|
|
*
|
|
* This function will call the provided callback function for every active
|
|
* connection. Polling will continue until all connections have been polled
|
|
* or until the user-supplied function returns a non-zero value (which it
|
|
* should do only if it cannot accept further write data).
|
|
*
|
|
* When the callback function is called, there may be an outbound packet
|
|
* waiting for service in the device packet buffer, and if so the d_len field
|
|
* is set to a value larger than zero. The device driver should then send
|
|
* out the packet.
|
|
*
|
|
* Assumptions:
|
|
* This function is called from the MAC device driver with the network
|
|
* locked.
|
|
*
|
|
****************************************************************************/
|
|
|
|
int devif_poll(FAR struct net_driver_s *dev, devif_poll_callback_t callback)
|
|
{
|
|
int bstop = false;
|
|
|
|
/* Traverse all of the active packet connections and perform the poll
|
|
* action.
|
|
*/
|
|
|
|
#ifdef CONFIG_NET_ARP_SEND
|
|
/* Check for pending ARP requests */
|
|
|
|
bstop = arp_poll(dev, callback);
|
|
if (!bstop)
|
|
#endif
|
|
#ifdef CONFIG_NET_PKT
|
|
{
|
|
/* Check for pending packet socket transfer */
|
|
|
|
bstop = devif_poll_pkt_connections(dev, callback);
|
|
}
|
|
|
|
if (!bstop)
|
|
#endif
|
|
#ifdef CONFIG_NET_CAN
|
|
{
|
|
/* Check for pending packet socket transfer */
|
|
|
|
bstop = devif_poll_can_connections(dev, callback);
|
|
}
|
|
|
|
if (!bstop)
|
|
#endif
|
|
#ifdef CONFIG_NET_BLUETOOTH
|
|
{
|
|
/* Check for pending PF_BLUETOOTH socket transfer */
|
|
|
|
bstop = devif_poll_bluetooth_connections(dev, callback);
|
|
}
|
|
|
|
if (!bstop)
|
|
#endif
|
|
#ifdef CONFIG_NET_IEEE802154
|
|
{
|
|
/* Check for pending PF_IEEE802154 socket transfer */
|
|
|
|
bstop = devif_poll_ieee802154_connections(dev, callback);
|
|
}
|
|
|
|
if (!bstop)
|
|
#endif
|
|
#ifdef CONFIG_NET_IGMP
|
|
{
|
|
/* Check for pending IGMP messages */
|
|
|
|
bstop = devif_poll_igmp(dev, callback);
|
|
}
|
|
|
|
if (!bstop)
|
|
#endif
|
|
#ifdef CONFIG_NET_MLD
|
|
{
|
|
/* Check for pending MLD messages */
|
|
|
|
bstop = devif_poll_mld(dev, callback);
|
|
}
|
|
|
|
if (!bstop)
|
|
#endif
|
|
#ifdef NET_TCP_HAVE_STACK
|
|
{
|
|
/* Traverse all of the active TCP connections and perform the poll
|
|
* action.
|
|
*/
|
|
|
|
bstop = devif_poll_tcp_connections(dev, callback);
|
|
}
|
|
|
|
if (!bstop)
|
|
#endif
|
|
#ifdef NET_UDP_HAVE_STACK
|
|
{
|
|
/* Traverse all of the allocated UDP connections and perform
|
|
* the poll action
|
|
*/
|
|
|
|
bstop = devif_poll_udp_connections(dev, callback);
|
|
}
|
|
|
|
if (!bstop)
|
|
#endif
|
|
#if defined(CONFIG_NET_ICMP) && defined(CONFIG_NET_ICMP_SOCKET)
|
|
{
|
|
/* Traverse all of the tasks waiting to send an ICMP ECHO request. */
|
|
|
|
bstop = devif_poll_icmp(dev, callback);
|
|
}
|
|
|
|
if (!bstop)
|
|
#endif
|
|
#if defined(CONFIG_NET_ICMPv6_SOCKET) || defined(CONFIG_NET_ICMPv6_NEIGHBOR)
|
|
{
|
|
/* Traverse all of the tasks waiting to send an ICMPv6 ECHO request. */
|
|
|
|
bstop = devif_poll_icmpv6(dev, callback);
|
|
}
|
|
|
|
if (!bstop)
|
|
#endif
|
|
#ifdef CONFIG_NET_IPFORWARD
|
|
{
|
|
/* Traverse all of the tasks waiting to forward a packet to this device. */
|
|
|
|
bstop = devif_poll_forward(dev, callback);
|
|
}
|
|
|
|
if (!bstop)
|
|
#endif
|
|
{
|
|
/* Nothing more to do */
|
|
}
|
|
|
|
return bstop;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: devif_timer
|
|
*
|
|
* Description:
|
|
* These function will traverse each active network connection structure and
|
|
* perform network timer operations. The Ethernet driver MUST implement
|
|
* logic to periodically call devif_timer().
|
|
*
|
|
* This function will call the provided callback function for every active
|
|
* connection. Polling will continue until all connections have been polled
|
|
* or until the user-supplied function returns a non-zero value (which it
|
|
* should do only if it cannot accept further write data).
|
|
*
|
|
* When the callback function is called, there may be an outbound packet
|
|
* waiting for service in the device packet buffer, and if so the d_len field
|
|
* is set to a value larger than zero. The device driver should then send
|
|
* out the packet.
|
|
*
|
|
* Assumptions:
|
|
* This function is called from the MAC device driver with the network
|
|
* locked.
|
|
*
|
|
****************************************************************************/
|
|
|
|
int devif_timer(FAR struct net_driver_s *dev, int delay,
|
|
devif_poll_callback_t callback)
|
|
{
|
|
#if defined(CONFIG_NET_IPv4_REASSEMBLY) || defined(NET_TCP_HAVE_STACK)
|
|
int hsec = TICK2HSEC(delay);
|
|
#endif
|
|
int bstop = false;
|
|
|
|
#ifdef CONFIG_NET_IPv4_REASSEMBLY
|
|
/* Increment the timer used by the IP reassembly logic */
|
|
|
|
if (g_reassembly_timer != 0 &&
|
|
g_reassembly_timer < CONFIG_NET_IPv4_REASS_MAXAGE)
|
|
{
|
|
g_reassembly_timer += hsec;
|
|
}
|
|
#endif
|
|
|
|
#ifdef NET_TCP_HAVE_STACK
|
|
/* Traverse all of the active TCP connections and perform the
|
|
* timer action.
|
|
*/
|
|
|
|
bstop = devif_poll_tcp_timer(dev, callback, hsec);
|
|
#endif
|
|
|
|
/* If possible, continue with a normal poll checking for pending
|
|
* network driver actions.
|
|
*/
|
|
|
|
if (!bstop)
|
|
{
|
|
bstop = devif_poll(dev, callback);
|
|
}
|
|
|
|
return bstop;
|
|
}
|
|
|
|
#endif /* CONFIG_NET */
|