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/****************************************************************************
* net/uip/uip-poll.c
*
* Copyright (C) 2007 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
*
* 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 <nuttx/config.h>
#ifdef CONFIG_NET
#include <sys/types.h>
#include <debug.h>
#include <net/uip/uipopt.h>
#include <net/uip/uip.h>
#include <net/uip/uip-arch.h>
#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.
*
****************************************************************************/
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;
}
/****************************************************************************
* 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.
*
****************************************************************************/
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;
}
/****************************************************************************
* 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 */
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