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linux-next/drivers/net/wireless/ti/wlcore/event.c
Bartosz.Markowski@tieto.com 5f561f686b wlcore/wl12xx: implement better beacon loss handling 
Make use of REGAINED_BSS_EVENT and instead of reporting connection
loss immediately on each BEACON_LOSE event, try if not regained
in reasonable period of time.

Signed-off-by: bartosz.markowski <bartosz.markowski@tieto.com>
Signed-off-by: Luciano Coelho <coelho@ti.com>
2012-05-15 17:53:25 -04:00

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/*
* This file is part of wl1271
*
* Copyright (C) 2008-2009 Nokia Corporation
*
* Contact: Luciano Coelho <luciano.coelho@nokia.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*
*/
#include "wlcore.h"
#include "debug.h"
#include "io.h"
#include "event.h"
#include "ps.h"
#include "scan.h"
#include "wl12xx_80211.h"
static void wl1271_event_rssi_trigger(struct wl1271 *wl,
struct wl12xx_vif *wlvif,
struct event_mailbox *mbox)
{
struct ieee80211_vif *vif = wl12xx_wlvif_to_vif(wlvif);
enum nl80211_cqm_rssi_threshold_event event;
s8 metric = mbox->rssi_snr_trigger_metric[0];
wl1271_debug(DEBUG_EVENT, "RSSI trigger metric: %d", metric);
if (metric <= wlvif->rssi_thold)
event = NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW;
else
event = NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH;
if (event != wlvif->last_rssi_event)
ieee80211_cqm_rssi_notify(vif, event, GFP_KERNEL);
wlvif->last_rssi_event = event;
}
static void wl1271_stop_ba_event(struct wl1271 *wl, struct wl12xx_vif *wlvif)
{
struct ieee80211_vif *vif = wl12xx_wlvif_to_vif(wlvif);
if (wlvif->bss_type != BSS_TYPE_AP_BSS) {
if (!wlvif->sta.ba_rx_bitmap)
return;
ieee80211_stop_rx_ba_session(vif, wlvif->sta.ba_rx_bitmap,
vif->bss_conf.bssid);
} else {
u8 hlid;
struct wl1271_link *lnk;
for_each_set_bit(hlid, wlvif->ap.sta_hlid_map,
WL12XX_MAX_LINKS) {
lnk = &wl->links[hlid];
if (!lnk->ba_bitmap)
continue;
ieee80211_stop_rx_ba_session(vif,
lnk->ba_bitmap,
lnk->addr);
}
}
}
static void wl12xx_event_soft_gemini_sense(struct wl1271 *wl,
u8 enable)
{
struct wl12xx_vif *wlvif;
if (enable) {
set_bit(WL1271_FLAG_SOFT_GEMINI, &wl->flags);
} else {
clear_bit(WL1271_FLAG_SOFT_GEMINI, &wl->flags);
wl12xx_for_each_wlvif_sta(wl, wlvif) {
wl1271_recalc_rx_streaming(wl, wlvif);
}
}
}
static void wl1271_event_mbox_dump(struct event_mailbox *mbox)
{
wl1271_debug(DEBUG_EVENT, "MBOX DUMP:");
wl1271_debug(DEBUG_EVENT, "\tvector: 0x%x", mbox->events_vector);
wl1271_debug(DEBUG_EVENT, "\tmask: 0x%x", mbox->events_mask);
}
static int wl1271_event_process(struct wl1271 *wl)
{
struct event_mailbox *mbox = wl->mbox;
struct ieee80211_vif *vif;
struct wl12xx_vif *wlvif;
u32 vector;
bool disconnect_sta = false;
unsigned long sta_bitmap = 0;
wl1271_event_mbox_dump(mbox);
vector = le32_to_cpu(mbox->events_vector);
vector &= ~(le32_to_cpu(mbox->events_mask));
wl1271_debug(DEBUG_EVENT, "vector: 0x%x", vector);
if (vector & SCAN_COMPLETE_EVENT_ID) {
wl1271_debug(DEBUG_EVENT, "status: 0x%x",
mbox->scheduled_scan_status);
wl1271_scan_stm(wl, wl->scan_vif);
}
if (vector & PERIODIC_SCAN_REPORT_EVENT_ID) {
wl1271_debug(DEBUG_EVENT, "PERIODIC_SCAN_REPORT_EVENT "
"(status 0x%0x)", mbox->scheduled_scan_status);
wl1271_scan_sched_scan_results(wl);
}
if (vector & PERIODIC_SCAN_COMPLETE_EVENT_ID) {
wl1271_debug(DEBUG_EVENT, "PERIODIC_SCAN_COMPLETE_EVENT "
"(status 0x%0x)", mbox->scheduled_scan_status);
if (wl->sched_scanning) {
ieee80211_sched_scan_stopped(wl->hw);
wl->sched_scanning = false;
}
}
if (vector & SOFT_GEMINI_SENSE_EVENT_ID)
wl12xx_event_soft_gemini_sense(wl,
mbox->soft_gemini_sense_info);
/*
* We are HW_MONITOR device. On beacon loss - queue
* connection loss work. Cancel it on REGAINED event.
*/
if (vector & BSS_LOSE_EVENT_ID) {
/* TODO: check for multi-role */
int delay = wl->conf.conn.synch_fail_thold *
wl->conf.conn.bss_lose_timeout;
wl1271_info("Beacon loss detected.");
cancel_delayed_work_sync(&wl->connection_loss_work);
ieee80211_queue_delayed_work(wl->hw, &wl->connection_loss_work,
msecs_to_jiffies(delay));
}
if (vector & REGAINED_BSS_EVENT_ID) {
/* TODO: check for multi-role */
wl1271_info("Beacon regained.");
cancel_delayed_work_sync(&wl->connection_loss_work);
}
if (vector & RSSI_SNR_TRIGGER_0_EVENT_ID) {
/* TODO: check actual multi-role support */
wl1271_debug(DEBUG_EVENT, "RSSI_SNR_TRIGGER_0_EVENT");
wl12xx_for_each_wlvif_sta(wl, wlvif) {
wl1271_event_rssi_trigger(wl, wlvif, mbox);
}
}
if (vector & BA_SESSION_RX_CONSTRAINT_EVENT_ID) {
u8 role_id = mbox->role_id;
wl1271_debug(DEBUG_EVENT, "BA_SESSION_RX_CONSTRAINT_EVENT_ID. "
"ba_allowed = 0x%x, role_id=%d",
mbox->rx_ba_allowed, role_id);
wl12xx_for_each_wlvif(wl, wlvif) {
if (role_id != 0xff && role_id != wlvif->role_id)
continue;
wlvif->ba_allowed = !!mbox->rx_ba_allowed;
if (!wlvif->ba_allowed)
wl1271_stop_ba_event(wl, wlvif);
}
}
if (vector & CHANNEL_SWITCH_COMPLETE_EVENT_ID) {
wl1271_debug(DEBUG_EVENT, "CHANNEL_SWITCH_COMPLETE_EVENT_ID. "
"status = 0x%x",
mbox->channel_switch_status);
/*
* That event uses for two cases:
* 1) channel switch complete with status=0
* 2) channel switch failed status=1
*/
/* TODO: configure only the relevant vif */
wl12xx_for_each_wlvif_sta(wl, wlvif) {
bool success;
if (!test_and_clear_bit(WLVIF_FLAG_CS_PROGRESS,
&wlvif->flags))
continue;
success = mbox->channel_switch_status ? false : true;
vif = wl12xx_wlvif_to_vif(wlvif);
ieee80211_chswitch_done(vif, success);
}
}
if ((vector & DUMMY_PACKET_EVENT_ID)) {
wl1271_debug(DEBUG_EVENT, "DUMMY_PACKET_ID_EVENT_ID");
wl1271_tx_dummy_packet(wl);
}
/*
* "TX retries exceeded" has a different meaning according to mode.
* In AP mode the offending station is disconnected.
*/
if (vector & MAX_TX_RETRY_EVENT_ID) {
wl1271_debug(DEBUG_EVENT, "MAX_TX_RETRY_EVENT_ID");
sta_bitmap |= le16_to_cpu(mbox->sta_tx_retry_exceeded);
disconnect_sta = true;
}
if (vector & INACTIVE_STA_EVENT_ID) {
wl1271_debug(DEBUG_EVENT, "INACTIVE_STA_EVENT_ID");
sta_bitmap |= le16_to_cpu(mbox->sta_aging_status);
disconnect_sta = true;
}
if (disconnect_sta) {
u32 num_packets = wl->conf.tx.max_tx_retries;
struct ieee80211_sta *sta;
const u8 *addr;
int h;
for_each_set_bit(h, &sta_bitmap, WL12XX_MAX_LINKS) {
bool found = false;
/* find the ap vif connected to this sta */
wl12xx_for_each_wlvif_ap(wl, wlvif) {
if (!test_bit(h, wlvif->ap.sta_hlid_map))
continue;
found = true;
break;
}
if (!found)
continue;
vif = wl12xx_wlvif_to_vif(wlvif);
addr = wl->links[h].addr;
rcu_read_lock();
sta = ieee80211_find_sta(vif, addr);
if (sta) {
wl1271_debug(DEBUG_EVENT, "remove sta %d", h);
ieee80211_report_low_ack(sta, num_packets);
}
rcu_read_unlock();
}
}
return 0;
}
int wl1271_event_unmask(struct wl1271 *wl)
{
int ret;
ret = wl1271_acx_event_mbox_mask(wl, ~(wl->event_mask));
if (ret < 0)
return ret;
return 0;
}
int wl1271_event_handle(struct wl1271 *wl, u8 mbox_num)
{
int ret;
wl1271_debug(DEBUG_EVENT, "EVENT on mbox %d", mbox_num);
if (mbox_num > 1)
return -EINVAL;
/* first we read the mbox descriptor */
wl1271_read(wl, wl->mbox_ptr[mbox_num], wl->mbox,
sizeof(*wl->mbox), false);
/* process the descriptor */
ret = wl1271_event_process(wl);
if (ret < 0)
return ret;
/*
* TODO: we just need this because one bit is in a different
* place. Is there any better way?
*/
wl->ops->ack_event(wl);
return 0;
}
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