/**************************************************************************** * net/uip/uip-poll.c * * Copyright (C) 2007 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * 3. Neither the name NuttX nor the names of its contributors may be * used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. * ****************************************************************************/ /**************************************************************************** * Included Files ****************************************************************************/ #include #ifdef CONFIG_NET #include #include #include #include #include #include "uip-internal.h" /**************************************************************************** * Private Data ****************************************************************************/ /**************************************************************************** * Private Functions ****************************************************************************/ /**************************************************************************** * Function: uip_polludpconnections * * Description: * Poll all UDP connections for available packets to send. * * Assumptions: * This function is called from the CAN device driver and may be called from * the timer interrupt/watchdog handle level. * ****************************************************************************/ #ifdef CONFIG_NET_UDP static int uip_polludpconnections(struct uip_driver_s *dev, uip_poll_callback_t callback) { struct uip_udp_conn *udp_conn = NULL; int bstop = 0; /* Traverse all of the allocated UDP connections and perform the poll action */ while (!bstop && (udp_conn = uip_nextudpconn(udp_conn))) { /* Perform the UDP TX poll */ uip_udppoll(dev, udp_conn); /* Call back into the driver */ bstop = callback(dev); } return bstop; } #else # define uip_polludpconnections(dev,callback) (0) #endif /* CONFIG_NET_UDP */ /**************************************************************************** * Function: uip_polltcpconnections * * Description: * Poll all UDP connections for available packets to send. * * Assumptions: * This function is called from the CAN device driver and may be called from * the timer interrupt/watchdog handle level. * ****************************************************************************/ #ifdef CONFIG_NET_TCP static inline int uip_polltcpconnections(struct uip_driver_s *dev, uip_poll_callback_t callback) { struct uip_conn *conn = NULL; int bstop = 0; /* Traverse all of the active TCP connections and perform the poll action */ while (!bstop && (conn = uip_nexttcpconn(conn))) { /* Perform the TCP TX poll */ uip_tcppoll(dev, conn); /* Call back into the driver */ bstop = callback(dev); } return bstop; } #else # define uip_polltcpconnections(dev, callback) (0) #endif /**************************************************************************** * Function: uip_polltcptimer * * Description: * The TCP timer has expired. Update TCP timing state in each active, * TCP connection. * * Assumptions: * This function is called from the CAN device driver and may be called from * the timer interrupt/watchdog handle level. * ****************************************************************************/ #ifdef CONFIG_NET_TCP static inline int uip_polltcptimer(struct uip_driver_s *dev, uip_poll_callback_t callback, int hsec) { struct uip_conn *conn = NULL; int bstop = 0; /* Traverse all of the active TCP connections and perform the poll action */ while (!bstop && (conn = uip_nexttcpconn(conn))) { /* Perform the TCP timer poll */ uip_tcptimer(dev, conn, hsec); /* Call back into the driver */ bstop = callback(dev); } return bstop; } #else # define uip_polltcptimer(dev, callback, hsec) (0) #endif /**************************************************************************** * Public Functions ****************************************************************************/ /**************************************************************************** * Function: uip_poll * * Description: * This function will traverse each active uIP connection structure and * will perform TCP and UDP polling operations. uip_poll() may be called * asychronously with the network drvier 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-suplied 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 uIP 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 CAN device driver and may be called from * the timer interrupt/watchdog handle level. * ****************************************************************************/ int uip_poll(struct uip_driver_s *dev, uip_poll_callback_t callback) { int bstop; /* Traverse all of the active TCP connections and perform the poll action */ bstop = uip_polltcpconnections(dev, callback); if (!bstop) { /* Traverse all of the allocated UDP connections and perform the poll action */ bstop = uip_polludpconnections(dev, callback); } return bstop; } /**************************************************************************** * Function: uip_timer * * Description: * These function will traverse each active uIP connection structure and * perform TCP timer operations (and UDP polling operations). The CAN * driver MUST implement logic to periodically call uip_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-suplied 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 uIP 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 CAN device driver and may be called from * the timer interrupt/watchdog handle level. * ****************************************************************************/ int uip_timer(struct uip_driver_s *dev, uip_poll_callback_t callback, int hsec) { int bstop; /* Increment the timer used by the IP reassembly logic */ #if UIP_REASSEMBLY if (uip_reasstmr != 0 && uip_reasstmr < UIP_REASS_MAXAGE) { uip_reasstmr += hsec; } #endif /* UIP_REASSEMBLY */ /* Traverse all of the active TCP connections and perform the timer action */ bstop = uip_polltcptimer(dev, callback, hsec); if (!bstop) { /* Traverse all of the allocated UDP connections and perform the poll action */ bstop = uip_polludpconnections(dev, callback); } return bstop; } #endif /* CONFIG_NET */
