/***
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*
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* rtmac/nomac/nomac_proto.c
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*
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* RTmac - real-time networking media access control subsystem
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* Copyright (C) 2002 Marc Kleine-Budde <kleine-budde@gmx.de>,
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* 2003-2005 Jan Kiszka <Jan.Kiszka@web.de>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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#include <linux/init.h>
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#include <rtdev.h>
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#include <rtmac/rtmac_proto.h>
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#include <rtmac/nomac/nomac.h>
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static struct rtskb_queue nrt_rtskb_queue;
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static rtdm_task_t wrapper_task;
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static rtdm_event_t wakeup_sem;
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int nomac_rt_packet_tx(struct rtskb *rtskb, struct rtnet_device *rtdev)
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{
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/* unused here, just to demonstrate access to the discipline state
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struct nomac_priv *nomac =
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(struct nomac_priv *)rtdev->mac_priv->disc_priv; */
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int ret;
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rtcap_mark_rtmac_enqueue(rtskb);
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/* no MAC: we simply transmit the packet under xmit_lock */
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rtdm_mutex_lock(&rtdev->xmit_mutex);
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ret = rtmac_xmit(rtskb);
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rtdm_mutex_unlock(&rtdev->xmit_mutex);
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return ret;
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}
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int nomac_nrt_packet_tx(struct rtskb *rtskb)
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{
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struct rtnet_device *rtdev = rtskb->rtdev;
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/* unused here, just to demonstrate access to the discipline state
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struct nomac_priv *nomac =
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(struct nomac_priv *)rtdev->mac_priv->disc_priv; */
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int ret;
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rtcap_mark_rtmac_enqueue(rtskb);
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/* note: this routine may be called both in rt and non-rt context
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* => detect and wrap the context if necessary */
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if (!rtdm_in_rt_context()) {
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rtskb_queue_tail(&nrt_rtskb_queue, rtskb);
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rtdm_event_signal(&wakeup_sem);
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return 0;
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} else {
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/* no MAC: we simply transmit the packet under xmit_lock */
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rtdm_mutex_lock(&rtdev->xmit_mutex);
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ret = rtmac_xmit(rtskb);
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rtdm_mutex_unlock(&rtdev->xmit_mutex);
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return ret;
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}
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}
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void nrt_xmit_task(void *arg)
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{
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struct rtskb *rtskb;
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struct rtnet_device *rtdev;
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while (!rtdm_task_should_stop()) {
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if (rtdm_event_wait(&wakeup_sem) < 0)
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break;
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while ((rtskb = rtskb_dequeue(&nrt_rtskb_queue))) {
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rtdev = rtskb->rtdev;
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/* no MAC: we simply transmit the packet under xmit_lock */
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rtdm_mutex_lock(&rtdev->xmit_mutex);
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rtmac_xmit(rtskb);
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rtdm_mutex_unlock(&rtdev->xmit_mutex);
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}
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}
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}
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int nomac_packet_rx(struct rtskb *rtskb)
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{
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/* actually, NoMAC doesn't expect any control packet */
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kfree_rtskb(rtskb);
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return 0;
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}
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int __init nomac_proto_init(void)
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{
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int ret;
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rtskb_queue_init(&nrt_rtskb_queue);
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rtdm_event_init(&wakeup_sem, 0);
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ret = rtdm_task_init(&wrapper_task, "rtnet-nomac", nrt_xmit_task, 0,
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RTDM_TASK_LOWEST_PRIORITY, 0);
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if (ret < 0) {
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rtdm_event_destroy(&wakeup_sem);
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return ret;
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}
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return 0;
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}
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void nomac_proto_cleanup(void)
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{
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rtdm_event_destroy(&wakeup_sem);
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rtdm_task_destroy(&wrapper_task);
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}
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