e76aadc572
The on-channel work optimisations have caused a number of issues, and the code is unfortunately very complex and almost impossible to follow. Instead of attempting to put in more workarounds let's just remove those optimisations, we can work on them again later, after we change the whole auth/assoc design. This should fix rate_control_send_low() warnings, see RH bug 731365. Cc: stable@vger.kernel.org Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
282 lines
8.4 KiB
C
282 lines
8.4 KiB
C
/*
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* Off-channel operation helpers
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*
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* Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi>
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* Copyright 2004, Instant802 Networks, Inc.
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* Copyright 2005, Devicescape Software, Inc.
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* Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
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* Copyright 2007, Michael Wu <flamingice@sourmilk.net>
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* Copyright 2009 Johannes Berg <johannes@sipsolutions.net>
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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 version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/export.h>
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#include <net/mac80211.h>
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#include "ieee80211_i.h"
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#include "driver-trace.h"
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/*
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* Tell our hardware to disable PS.
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* Optionally inform AP that we will go to sleep so that it will buffer
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* the frames while we are doing off-channel work. This is optional
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* because we *may* be doing work on-operating channel, and want our
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* hardware unconditionally awake, but still let the AP send us normal frames.
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*/
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static void ieee80211_offchannel_ps_enable(struct ieee80211_sub_if_data *sdata,
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bool tell_ap)
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{
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struct ieee80211_local *local = sdata->local;
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struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
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local->offchannel_ps_enabled = false;
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/* FIXME: what to do when local->pspolling is true? */
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del_timer_sync(&local->dynamic_ps_timer);
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del_timer_sync(&ifmgd->bcn_mon_timer);
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del_timer_sync(&ifmgd->conn_mon_timer);
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cancel_work_sync(&local->dynamic_ps_enable_work);
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if (local->hw.conf.flags & IEEE80211_CONF_PS) {
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local->offchannel_ps_enabled = true;
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local->hw.conf.flags &= ~IEEE80211_CONF_PS;
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ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
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}
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if (tell_ap && (!local->offchannel_ps_enabled ||
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!(local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)))
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/*
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* If power save was enabled, no need to send a nullfunc
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* frame because AP knows that we are sleeping. But if the
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* hardware is creating the nullfunc frame for power save
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* status (ie. IEEE80211_HW_PS_NULLFUNC_STACK is not
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* enabled) and power save was enabled, the firmware just
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* sent a null frame with power save disabled. So we need
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* to send a new nullfunc frame to inform the AP that we
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* are again sleeping.
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*/
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ieee80211_send_nullfunc(local, sdata, 1);
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}
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/* inform AP that we are awake again, unless power save is enabled */
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static void ieee80211_offchannel_ps_disable(struct ieee80211_sub_if_data *sdata)
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{
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struct ieee80211_local *local = sdata->local;
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if (!local->ps_sdata)
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ieee80211_send_nullfunc(local, sdata, 0);
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else if (local->offchannel_ps_enabled) {
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/*
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* In !IEEE80211_HW_PS_NULLFUNC_STACK case the hardware
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* will send a nullfunc frame with the powersave bit set
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* even though the AP already knows that we are sleeping.
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* This could be avoided by sending a null frame with power
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* save bit disabled before enabling the power save, but
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* this doesn't gain anything.
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*
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* When IEEE80211_HW_PS_NULLFUNC_STACK is enabled, no need
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* to send a nullfunc frame because AP already knows that
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* we are sleeping, let's just enable power save mode in
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* hardware.
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*/
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/* TODO: Only set hardware if CONF_PS changed?
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* TODO: Should we set offchannel_ps_enabled to false?
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*/
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local->hw.conf.flags |= IEEE80211_CONF_PS;
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ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
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} else if (local->hw.conf.dynamic_ps_timeout > 0) {
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/*
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* If IEEE80211_CONF_PS was not set and the dynamic_ps_timer
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* had been running before leaving the operating channel,
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* restart the timer now and send a nullfunc frame to inform
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* the AP that we are awake.
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*/
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ieee80211_send_nullfunc(local, sdata, 0);
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mod_timer(&local->dynamic_ps_timer, jiffies +
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msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
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}
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ieee80211_sta_reset_beacon_monitor(sdata);
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ieee80211_sta_reset_conn_monitor(sdata);
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}
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void ieee80211_offchannel_stop_vifs(struct ieee80211_local *local,
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bool offchannel_ps_enable)
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{
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struct ieee80211_sub_if_data *sdata;
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/*
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* notify the AP about us leaving the channel and stop all
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* STA interfaces.
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*/
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mutex_lock(&local->iflist_mtx);
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list_for_each_entry(sdata, &local->interfaces, list) {
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if (!ieee80211_sdata_running(sdata))
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continue;
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if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
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set_bit(SDATA_STATE_OFFCHANNEL, &sdata->state);
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/* Check to see if we should disable beaconing. */
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if (sdata->vif.type == NL80211_IFTYPE_AP ||
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sdata->vif.type == NL80211_IFTYPE_ADHOC ||
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sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
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ieee80211_bss_info_change_notify(
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sdata, BSS_CHANGED_BEACON_ENABLED);
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if (sdata->vif.type != NL80211_IFTYPE_MONITOR) {
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netif_tx_stop_all_queues(sdata->dev);
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if (offchannel_ps_enable &&
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(sdata->vif.type == NL80211_IFTYPE_STATION) &&
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sdata->u.mgd.associated)
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ieee80211_offchannel_ps_enable(sdata, true);
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}
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}
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mutex_unlock(&local->iflist_mtx);
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}
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void ieee80211_offchannel_enable_all_ps(struct ieee80211_local *local,
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bool tell_ap)
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{
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struct ieee80211_sub_if_data *sdata;
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mutex_lock(&local->iflist_mtx);
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list_for_each_entry(sdata, &local->interfaces, list) {
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if (!ieee80211_sdata_running(sdata))
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continue;
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if (sdata->vif.type == NL80211_IFTYPE_STATION &&
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sdata->u.mgd.associated)
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ieee80211_offchannel_ps_enable(sdata, tell_ap);
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}
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mutex_unlock(&local->iflist_mtx);
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}
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void ieee80211_offchannel_return(struct ieee80211_local *local,
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bool offchannel_ps_disable)
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{
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struct ieee80211_sub_if_data *sdata;
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mutex_lock(&local->iflist_mtx);
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list_for_each_entry(sdata, &local->interfaces, list) {
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if (!ieee80211_sdata_running(sdata))
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continue;
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/* Tell AP we're back */
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if (offchannel_ps_disable &&
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sdata->vif.type == NL80211_IFTYPE_STATION) {
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if (sdata->u.mgd.associated)
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ieee80211_offchannel_ps_disable(sdata);
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}
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if (sdata->vif.type != NL80211_IFTYPE_MONITOR) {
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clear_bit(SDATA_STATE_OFFCHANNEL, &sdata->state);
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/*
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* This may wake up queues even though the driver
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* currently has them stopped. This is not very
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* likely, since the driver won't have gotten any
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* (or hardly any) new packets while we weren't
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* on the right channel, and even if it happens
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* it will at most lead to queueing up one more
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* packet per queue in mac80211 rather than on
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* the interface qdisc.
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*/
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netif_tx_wake_all_queues(sdata->dev);
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}
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if (sdata->vif.type == NL80211_IFTYPE_AP ||
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sdata->vif.type == NL80211_IFTYPE_ADHOC ||
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sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
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ieee80211_bss_info_change_notify(
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sdata, BSS_CHANGED_BEACON_ENABLED);
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}
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mutex_unlock(&local->iflist_mtx);
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}
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static void ieee80211_hw_roc_start(struct work_struct *work)
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{
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struct ieee80211_local *local =
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container_of(work, struct ieee80211_local, hw_roc_start);
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struct ieee80211_sub_if_data *sdata;
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mutex_lock(&local->mtx);
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if (!local->hw_roc_channel) {
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mutex_unlock(&local->mtx);
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return;
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}
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if (local->hw_roc_skb) {
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sdata = IEEE80211_DEV_TO_SUB_IF(local->hw_roc_dev);
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ieee80211_tx_skb(sdata, local->hw_roc_skb);
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local->hw_roc_skb = NULL;
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} else {
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cfg80211_ready_on_channel(local->hw_roc_dev,
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local->hw_roc_cookie,
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local->hw_roc_channel,
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local->hw_roc_channel_type,
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local->hw_roc_duration,
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GFP_KERNEL);
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}
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ieee80211_recalc_idle(local);
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mutex_unlock(&local->mtx);
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}
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void ieee80211_ready_on_channel(struct ieee80211_hw *hw)
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{
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struct ieee80211_local *local = hw_to_local(hw);
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trace_api_ready_on_channel(local);
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ieee80211_queue_work(hw, &local->hw_roc_start);
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}
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EXPORT_SYMBOL_GPL(ieee80211_ready_on_channel);
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static void ieee80211_hw_roc_done(struct work_struct *work)
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{
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struct ieee80211_local *local =
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container_of(work, struct ieee80211_local, hw_roc_done);
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mutex_lock(&local->mtx);
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if (!local->hw_roc_channel) {
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mutex_unlock(&local->mtx);
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return;
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}
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if (!local->hw_roc_for_tx)
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cfg80211_remain_on_channel_expired(local->hw_roc_dev,
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local->hw_roc_cookie,
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local->hw_roc_channel,
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local->hw_roc_channel_type,
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GFP_KERNEL);
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local->hw_roc_channel = NULL;
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local->hw_roc_cookie = 0;
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ieee80211_recalc_idle(local);
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mutex_unlock(&local->mtx);
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}
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void ieee80211_remain_on_channel_expired(struct ieee80211_hw *hw)
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{
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struct ieee80211_local *local = hw_to_local(hw);
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trace_api_remain_on_channel_expired(local);
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ieee80211_queue_work(hw, &local->hw_roc_done);
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}
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EXPORT_SYMBOL_GPL(ieee80211_remain_on_channel_expired);
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void ieee80211_hw_roc_setup(struct ieee80211_local *local)
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{
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INIT_WORK(&local->hw_roc_start, ieee80211_hw_roc_start);
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INIT_WORK(&local->hw_roc_done, ieee80211_hw_roc_done);
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}
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