mirror of
https://github.com/proski/madwifi
synced 2024-11-22 06:21:47 +03:00
18682f3d29
* Convert last SKB_CB()->ni to SKB_NI * Lots of comments * Refactor various pieces of code for consistency, readability, and removal of goto git-svn-id: http://madwifi-project.org/svn/madwifi/trunk@3666 0192ed92-7a03-0410-a25b-9323aeb14dbd
391 lines
11 KiB
C
391 lines
11 KiB
C
/*-
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* Copyright (c) 2001 Atsushi Onoe
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* Copyright (c) 2002-2005 Sam Leffler, Errno Consulting
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* All rights reserved.
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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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* 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 the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $Id$
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*/
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#ifndef EXPORT_SYMTAB
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#define EXPORT_SYMTAB
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#endif
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/*
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* IEEE 802.11 power save support.
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*/
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#ifndef AUTOCONF_INCLUDED
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#include <linux/config.h>
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#endif
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#include <linux/version.h>
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#include <linux/module.h>
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#include <linux/skbuff.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include "if_media.h"
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#include <net80211/ieee80211_var.h>
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#include <net80211/ieee80211_proto.h>
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static void ieee80211_set_tim(struct ieee80211_node *ni, int set);
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void
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ieee80211_power_attach(struct ieee80211com *ic)
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{
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}
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void
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ieee80211_power_detach(struct ieee80211com *ic)
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{
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}
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void
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ieee80211_power_vattach(struct ieee80211vap *vap)
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{
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if (vap->iv_opmode == IEEE80211_M_HOSTAP ||
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vap->iv_opmode == IEEE80211_M_IBSS) {
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/* NB: driver should override */
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vap->iv_set_tim = ieee80211_set_tim;
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}
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}
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void
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ieee80211_power_latevattach(struct ieee80211vap *vap)
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{
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/*
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* Allocate these only if needed. Beware that we
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* know adhoc mode doesn't support ATIM yet...
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*/
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if (vap->iv_opmode == IEEE80211_M_HOSTAP) {
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vap->iv_tim_len = howmany(vap->iv_max_aid, 8) * sizeof(u_int8_t);
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MALLOC(vap->iv_tim_bitmap, u_int8_t *, vap->iv_tim_len,
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M_DEVBUF, M_NOWAIT | M_ZERO);
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if (vap->iv_tim_bitmap == NULL) {
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printk(KERN_ERR "%s: no memory for TIM bitmap!\n", __func__);
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/* XXX good enough to keep from crashing? */
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vap->iv_tim_len = 0;
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}
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}
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}
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void
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ieee80211_power_vdetach(struct ieee80211vap *vap)
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{
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if (vap->iv_tim_bitmap != NULL) {
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FREE(vap->iv_tim_bitmap, M_DEVBUF);
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vap->iv_tim_bitmap = NULL;
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}
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}
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/*
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* Clear any frames queued on a node's power save queue.
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* The number of frames that were present is returned.
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*/
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int
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ieee80211_node_saveq_drain(struct ieee80211_node *ni)
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{
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struct sk_buff *skb;
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int qlen;
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IEEE80211_NODE_SAVEQ_LOCK_IRQ(ni);
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qlen = IEEE80211_NODE_SAVEQ_QLEN(ni);
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while ((skb = __skb_dequeue(&ni->ni_savedq)) != NULL) {
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if (SKB_NI(skb) != NULL)
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ieee80211_unref_node(&SKB_NI(skb));
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ieee80211_dev_kfree_skb(&skb);
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}
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IEEE80211_NODE_SAVEQ_UNLOCK_IRQ(ni);
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return qlen;
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}
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/*
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* Age frames on the power save queue. The aging interval is
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* 4 times the listen interval specified by the station. This
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* number is factored into the age calculations when the frame
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* is placed on the queue. We store ages as time differences
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* so we can check and/or adjust only the head of the list.
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* If a frame's age exceeds the threshold then discard it.
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* The number of frames discarded is returned so the caller
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* can check if it needs to adjust the tim.
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*/
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int
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ieee80211_node_saveq_age(struct ieee80211_node *ni)
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{
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int discard = 0;
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/* XXX racey but good 'nuf? */
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if (IEEE80211_NODE_SAVEQ_QLEN(ni) != 0) {
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#ifdef IEEE80211_DEBUG
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struct ieee80211vap *vap = ni->ni_vap;
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#endif
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struct sk_buff *skb;
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IEEE80211_NODE_SAVEQ_LOCK_IRQ(ni);
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while ((skb = skb_peek(&ni->ni_savedq)) != NULL &&
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M_AGE_GET(skb) < IEEE80211_INACT_WAIT) {
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IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
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"discard frame, age %u", M_AGE_GET(skb));
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skb = __skb_dequeue(&ni->ni_savedq);
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if (SKB_NI(skb) != NULL)
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ieee80211_unref_node(&SKB_NI(skb));
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ieee80211_dev_kfree_skb(&skb);
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discard++;
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}
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if (skb != NULL)
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M_AGE_SUB(skb, IEEE80211_INACT_WAIT);
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IEEE80211_NODE_SAVEQ_UNLOCK_IRQ(ni);
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IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
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"discard %u frames for age", discard);
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IEEE80211_NODE_STAT_ADD(ni, ps_discard, discard);
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}
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return discard;
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}
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/*
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* Indicate whether there are frames queued for a station in power-save mode.
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*/
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static void
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ieee80211_set_tim(struct ieee80211_node *ni, int set)
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{
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struct ieee80211vap *vap = ni->ni_vap;
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u_int16_t aid;
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KASSERT(vap->iv_opmode == IEEE80211_M_HOSTAP ||
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vap->iv_opmode == IEEE80211_M_IBSS,
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("operating mode %u", vap->iv_opmode));
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aid = IEEE80211_AID(ni->ni_associd);
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KASSERT(aid < vap->iv_max_aid,
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("bogus aid %u, max %u", aid, vap->iv_max_aid));
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IEEE80211_LOCK_IRQ(ni->ni_ic);
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if (set != (isset(vap->iv_tim_bitmap, aid) != 0)) {
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if (set) {
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setbit(vap->iv_tim_bitmap, aid);
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vap->iv_ps_pending++;
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} else {
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clrbit(vap->iv_tim_bitmap, aid);
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vap->iv_ps_pending--;
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}
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vap->iv_flags |= IEEE80211_F_TIMUPDATE;
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}
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IEEE80211_UNLOCK_IRQ(ni->ni_ic);
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}
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/*
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* Save an outbound packet for a node in power-save sleep state.
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* The new packet is placed on the node's saved queue, and the TIM
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* is changed, if necessary.
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* It must return either NETDEV_TX_OK or NETDEV_TX_BUSY
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*/
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int
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ieee80211_pwrsave(struct sk_buff *skb)
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{
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struct ieee80211_node *ni = SKB_NI(skb);
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struct ieee80211vap *vap = ni->ni_vap;
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struct ieee80211com *ic = ni->ni_ic;
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struct sk_buff *tail;
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int qlen, age;
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IEEE80211_NODE_SAVEQ_LOCK_IRQ(ni);
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if (IEEE80211_NODE_SAVEQ_QLEN(ni) >= IEEE80211_PS_MAX_QUEUE) {
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IEEE80211_NODE_STAT(ni, psq_drops);
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IEEE80211_NODE_SAVEQ_UNLOCK_IRQ_EARLY(ni);
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IEEE80211_NOTE(vap, IEEE80211_MSG_ANY, ni,
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"pwr save q overflow, drops %d (size %d)",
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ni->ni_stats.ns_psq_drops, IEEE80211_PS_MAX_QUEUE);
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#ifdef IEEE80211_DEBUG
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if (ieee80211_msg_dumppkts(vap))
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ieee80211_dump_pkt(ni->ni_ic, skb->data, skb->len, -1, -1);
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#endif
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if (SKB_NI(skb) != NULL)
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ieee80211_unref_node(&SKB_NI(skb));
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ieee80211_dev_kfree_skb(&skb);
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return NETDEV_TX_OK;
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}
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/*
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* Tag the frame with its expiry time and insert
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* it in the queue. The aging interval is 4 times
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* the listen interval specified by the station.
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* Frames that sit around too long are reclaimed
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* using this information.
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*/
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/* XXX handle overflow? */
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age = ((ni->ni_intval * ic->ic_lintval) << 2) / 1024; /* TU -> secs */
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tail = skb_peek_tail(&ni->ni_savedq);
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if (tail != NULL) {
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age -= M_AGE_GET(tail);
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__skb_queue_after(&ni->ni_savedq, tail, skb);
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} else
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__skb_queue_head(&ni->ni_savedq, skb);
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M_AGE_SET(skb, age);
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qlen = IEEE80211_NODE_SAVEQ_QLEN(ni);
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IEEE80211_NODE_SAVEQ_UNLOCK_IRQ(ni);
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IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
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"save frame, %u now queued", qlen);
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if (qlen == 1 && vap->iv_set_tim != NULL)
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vap->iv_set_tim(ni, 1);
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return NETDEV_TX_OK;
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}
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/*
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* Handle power-save state change in ap/ibss mode.
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*/
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void
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ieee80211_node_pwrsave(struct ieee80211_node *ni, int enable)
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{
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struct ieee80211vap *vap = ni->ni_vap;
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KASSERT(vap->iv_opmode == IEEE80211_M_HOSTAP ||
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vap->iv_opmode == IEEE80211_M_IBSS,
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("unexpected operating mode %u", vap->iv_opmode));
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if (enable) {
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if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) == 0)
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vap->iv_ps_sta++;
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ni->ni_flags |= IEEE80211_NODE_PWR_MGT;
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IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
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"power save mode on, %u STAs in PS mode",
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vap->iv_ps_sta);
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} else {
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if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT))
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vap->iv_ps_sta--;
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ni->ni_flags &= ~IEEE80211_NODE_PWR_MGT;
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IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
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"power save mode off, %u STAs in PS mode",
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vap->iv_ps_sta);
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/* XXX if no stations in ps mode, flush mc frames */
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/*
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* Flush queued unicast frames.
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*/
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if (IEEE80211_NODE_SAVEQ_QLEN(ni) == 0) {
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if (vap->iv_set_tim != NULL)
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vap->iv_set_tim(ni, 0); /* just in case */
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return;
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}
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IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
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"flush ps queue, %u packets queued",
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IEEE80211_NODE_SAVEQ_QLEN(ni));
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for (;;) {
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struct sk_buff *skb;
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int qlen;
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IEEE80211_NODE_SAVEQ_LOCK_IRQ(ni);
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IEEE80211_NODE_SAVEQ_DEQUEUE(ni, skb, qlen);
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IEEE80211_NODE_SAVEQ_UNLOCK_IRQ(ni);
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if (skb == NULL)
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break;
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/*
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* If this is the last packet, turn off the TIM bit.
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*
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* Set the M_PWR_SAV bit on skb to allow encap to test for
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* adding MORE_DATA bit to wh.
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*
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* The 802.11 MAC Spec says we should only set MORE_DATA for
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* unicast packets when the STA is in PS mode (7.1.3.1.8);
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* which it isn't.
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*/
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#if 0
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M_PWR_SAV_SET(skb);
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#endif
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#ifdef ATH_SUPERG_XR
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/*
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* if it is a XR vap, send the data to associated normal net
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* device. XR vap has a net device which is not registered with
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* OS.
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*/
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if (vap->iv_xrvap && vap->iv_flags & IEEE80211_F_XR)
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skb->dev = vap->iv_xrvap->iv_dev;
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else
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skb->dev = vap->iv_dev; /* XXX? unnecessary */
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#endif
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ieee80211_parent_queue_xmit(skb);
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}
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vap->iv_set_tim(ni, 0);
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}
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}
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/*
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* Handle power-save state change in station mode.
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*/
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void
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ieee80211_sta_pwrsave(struct ieee80211vap *vap, int enable)
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{
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struct ieee80211_node *ni = vap->iv_bss;
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int qlen;
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if (vap->iv_opmode != IEEE80211_M_STA)
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return;
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if (!!enable == !!IEEE80211_VAP_IS_SLEEPING(vap)) /* Bool. normalise */
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return;
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IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
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"STA power save mode %s", enable ? "on" : "off");
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if (!enable) {
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IEEE80211_VAP_WAKEUP(vap);
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ieee80211_send_nulldata(ieee80211_ref_node(ni));
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/*
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* Flush any queued frames; we can do this immediately
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* because we know they'll be queued behind the null
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* data frame we send the ap.
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* XXX: Can we use a data frame to take us out of PS mode?
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*/
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qlen = IEEE80211_NODE_SAVEQ_QLEN(ni);
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if (qlen != 0) {
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IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
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"flush PS queue, %u packets queued", qlen);
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for (;;) {
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struct sk_buff *skb;
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IEEE80211_NODE_SAVEQ_LOCK_IRQ(ni);
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skb = __skb_dequeue(&ni->ni_savedq);
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IEEE80211_NODE_SAVEQ_UNLOCK_IRQ(ni);
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if (skb == NULL)
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break;
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ieee80211_parent_queue_xmit(skb);
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}
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}
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} else {
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IEEE80211_VAP_GOTOSLEEP(vap);
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ieee80211_send_nulldata(ieee80211_ref_node(ni));
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}
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}
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