47684808fd
In AP mode we register for the MAX_TX_RETRY and INACTIVE_STA events. Both are reported to the upper layers as a TX failure in the offending stations. In STA mode we register only for the MAX_TX_RETRY event. A TX failure is interpreted as a loss of connection. Support for IEEE80211_HW_REPORTS_TX_ACK_STATUS has been removed to avoid the inherent race condition of a mac80211 TX failure counter in addition to the FW counter. This patch depends on "mac80211: allow low level driver to report packet loss" Signed-off-by: Arik Nemtsov <arik@wizery.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
335 lines
8.5 KiB
C
335 lines
8.5 KiB
C
/*
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* This file is part of wl1271
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*
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* Copyright (C) 2008-2009 Nokia Corporation
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*
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* Contact: Luciano Coelho <luciano.coelho@nokia.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* 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., 51 Franklin St, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*
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*/
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#include "wl12xx.h"
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#include "reg.h"
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#include "io.h"
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#include "event.h"
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#include "ps.h"
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#include "scan.h"
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#include "wl12xx_80211.h"
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void wl1271_pspoll_work(struct work_struct *work)
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{
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struct delayed_work *dwork;
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struct wl1271 *wl;
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int ret;
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dwork = container_of(work, struct delayed_work, work);
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wl = container_of(dwork, struct wl1271, pspoll_work);
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wl1271_debug(DEBUG_EVENT, "pspoll work");
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mutex_lock(&wl->mutex);
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if (unlikely(wl->state == WL1271_STATE_OFF))
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goto out;
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if (!test_and_clear_bit(WL1271_FLAG_PSPOLL_FAILURE, &wl->flags))
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goto out;
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if (!test_bit(WL1271_FLAG_STA_ASSOCIATED, &wl->flags))
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goto out;
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/*
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* if we end up here, then we were in powersave when the pspoll
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* delivery failure occurred, and no-one changed state since, so
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* we should go back to powersave.
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*/
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ret = wl1271_ps_elp_wakeup(wl);
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if (ret < 0)
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goto out;
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wl1271_ps_set_mode(wl, STATION_POWER_SAVE_MODE, wl->basic_rate, true);
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wl1271_ps_elp_sleep(wl);
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out:
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mutex_unlock(&wl->mutex);
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};
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static void wl1271_event_pspoll_delivery_fail(struct wl1271 *wl)
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{
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int delay = wl->conf.conn.ps_poll_recovery_period;
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int ret;
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wl->ps_poll_failures++;
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if (wl->ps_poll_failures == 1)
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wl1271_info("AP with dysfunctional ps-poll, "
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"trying to work around it.");
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/* force active mode receive data from the AP */
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if (test_bit(WL1271_FLAG_PSM, &wl->flags)) {
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ret = wl1271_ps_set_mode(wl, STATION_ACTIVE_MODE,
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wl->basic_rate, true);
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if (ret < 0)
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return;
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set_bit(WL1271_FLAG_PSPOLL_FAILURE, &wl->flags);
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ieee80211_queue_delayed_work(wl->hw, &wl->pspoll_work,
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msecs_to_jiffies(delay));
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}
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/*
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* If already in active mode, lets we should be getting data from
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* the AP right away. If we enter PSM too fast after this, and data
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* remains on the AP, we will get another event like this, and we'll
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* go into active once more.
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*/
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}
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static int wl1271_event_ps_report(struct wl1271 *wl,
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struct event_mailbox *mbox,
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bool *beacon_loss)
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{
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int ret = 0;
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u32 total_retries = wl->conf.conn.psm_entry_retries;
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wl1271_debug(DEBUG_EVENT, "ps_status: 0x%x", mbox->ps_status);
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switch (mbox->ps_status) {
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case EVENT_ENTER_POWER_SAVE_FAIL:
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wl1271_debug(DEBUG_PSM, "PSM entry failed");
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if (!test_bit(WL1271_FLAG_PSM, &wl->flags)) {
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/* remain in active mode */
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wl->psm_entry_retry = 0;
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break;
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}
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if (wl->psm_entry_retry < total_retries) {
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wl->psm_entry_retry++;
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ret = wl1271_ps_set_mode(wl, STATION_POWER_SAVE_MODE,
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wl->basic_rate, true);
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} else {
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wl1271_info("No ack to nullfunc from AP.");
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wl->psm_entry_retry = 0;
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*beacon_loss = true;
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}
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break;
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case EVENT_ENTER_POWER_SAVE_SUCCESS:
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wl->psm_entry_retry = 0;
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/* enable beacon filtering */
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ret = wl1271_acx_beacon_filter_opt(wl, true);
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if (ret < 0)
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break;
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/* enable beacon early termination */
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ret = wl1271_acx_bet_enable(wl, true);
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break;
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default:
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break;
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}
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return ret;
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}
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static void wl1271_event_rssi_trigger(struct wl1271 *wl,
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struct event_mailbox *mbox)
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{
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enum nl80211_cqm_rssi_threshold_event event;
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s8 metric = mbox->rssi_snr_trigger_metric[0];
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wl1271_debug(DEBUG_EVENT, "RSSI trigger metric: %d", metric);
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if (metric <= wl->rssi_thold)
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event = NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW;
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else
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event = NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH;
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if (event != wl->last_rssi_event)
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ieee80211_cqm_rssi_notify(wl->vif, event, GFP_KERNEL);
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wl->last_rssi_event = event;
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}
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static void wl1271_event_mbox_dump(struct event_mailbox *mbox)
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{
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wl1271_debug(DEBUG_EVENT, "MBOX DUMP:");
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wl1271_debug(DEBUG_EVENT, "\tvector: 0x%x", mbox->events_vector);
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wl1271_debug(DEBUG_EVENT, "\tmask: 0x%x", mbox->events_mask);
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}
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static int wl1271_event_process(struct wl1271 *wl, struct event_mailbox *mbox)
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{
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int ret;
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u32 vector;
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bool beacon_loss = false;
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bool is_ap = (wl->bss_type == BSS_TYPE_AP_BSS);
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bool disconnect_sta = false;
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unsigned long sta_bitmap = 0;
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wl1271_event_mbox_dump(mbox);
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vector = le32_to_cpu(mbox->events_vector);
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vector &= ~(le32_to_cpu(mbox->events_mask));
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wl1271_debug(DEBUG_EVENT, "vector: 0x%x", vector);
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if (vector & SCAN_COMPLETE_EVENT_ID) {
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wl1271_debug(DEBUG_EVENT, "status: 0x%x",
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mbox->scheduled_scan_status);
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wl1271_scan_stm(wl);
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}
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/* disable dynamic PS when requested by the firmware */
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if (vector & SOFT_GEMINI_SENSE_EVENT_ID &&
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wl->bss_type == BSS_TYPE_STA_BSS) {
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if (mbox->soft_gemini_sense_info)
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ieee80211_disable_dyn_ps(wl->vif);
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else
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ieee80211_enable_dyn_ps(wl->vif);
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}
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/*
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* The BSS_LOSE_EVENT_ID is only needed while psm (and hence beacon
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* filtering) is enabled. Without PSM, the stack will receive all
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* beacons and can detect beacon loss by itself.
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*
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* As there's possibility that the driver disables PSM before receiving
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* BSS_LOSE_EVENT, beacon loss has to be reported to the stack.
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*
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*/
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if ((vector & BSS_LOSE_EVENT_ID) && !is_ap) {
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wl1271_info("Beacon loss detected.");
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/* indicate to the stack, that beacons have been lost */
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beacon_loss = true;
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}
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if ((vector & PS_REPORT_EVENT_ID) && !is_ap) {
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wl1271_debug(DEBUG_EVENT, "PS_REPORT_EVENT");
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ret = wl1271_event_ps_report(wl, mbox, &beacon_loss);
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if (ret < 0)
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return ret;
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}
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if ((vector & PSPOLL_DELIVERY_FAILURE_EVENT_ID) && !is_ap)
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wl1271_event_pspoll_delivery_fail(wl);
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if (vector & RSSI_SNR_TRIGGER_0_EVENT_ID) {
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wl1271_debug(DEBUG_EVENT, "RSSI_SNR_TRIGGER_0_EVENT");
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if (wl->vif)
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wl1271_event_rssi_trigger(wl, mbox);
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}
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if ((vector & DUMMY_PACKET_EVENT_ID) && !is_ap) {
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wl1271_debug(DEBUG_EVENT, "DUMMY_PACKET_ID_EVENT_ID");
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if (wl->vif)
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wl1271_tx_dummy_packet(wl);
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}
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/*
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* "TX retries exceeded" has a different meaning according to mode.
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* In AP mode the offending station is disconnected. In STA mode we
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* report connection loss.
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*/
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if (vector & MAX_TX_RETRY_EVENT_ID) {
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wl1271_debug(DEBUG_EVENT, "MAX_TX_RETRY_EVENT_ID");
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if (is_ap) {
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sta_bitmap |= le16_to_cpu(mbox->sta_tx_retry_exceeded);
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disconnect_sta = true;
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} else {
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beacon_loss = true;
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}
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}
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if ((vector & INACTIVE_STA_EVENT_ID) && is_ap) {
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wl1271_debug(DEBUG_EVENT, "INACTIVE_STA_EVENT_ID");
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sta_bitmap |= le16_to_cpu(mbox->sta_aging_status);
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disconnect_sta = true;
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}
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if (wl->vif && beacon_loss)
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ieee80211_connection_loss(wl->vif);
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if (is_ap && disconnect_sta) {
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u32 num_packets = wl->conf.tx.max_tx_retries;
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struct ieee80211_sta *sta;
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const u8 *addr;
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int h;
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for (h = find_first_bit(&sta_bitmap, AP_MAX_LINKS);
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h < AP_MAX_LINKS;
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h = find_next_bit(&sta_bitmap, AP_MAX_LINKS, h+1)) {
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if (!wl1271_is_active_sta(wl, h))
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continue;
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addr = wl->links[h].addr;
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rcu_read_lock();
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sta = ieee80211_find_sta(wl->vif, addr);
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if (sta) {
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wl1271_debug(DEBUG_EVENT, "remove sta %d", h);
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ieee80211_report_low_ack(sta, num_packets);
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}
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rcu_read_unlock();
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}
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}
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return 0;
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}
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int wl1271_event_unmask(struct wl1271 *wl)
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{
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int ret;
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ret = wl1271_acx_event_mbox_mask(wl, ~(wl->event_mask));
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if (ret < 0)
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return ret;
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return 0;
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}
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void wl1271_event_mbox_config(struct wl1271 *wl)
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{
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wl->mbox_ptr[0] = wl1271_read32(wl, REG_EVENT_MAILBOX_PTR);
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wl->mbox_ptr[1] = wl->mbox_ptr[0] + sizeof(struct event_mailbox);
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wl1271_debug(DEBUG_EVENT, "MBOX ptrs: 0x%x 0x%x",
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wl->mbox_ptr[0], wl->mbox_ptr[1]);
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}
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int wl1271_event_handle(struct wl1271 *wl, u8 mbox_num)
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{
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struct event_mailbox mbox;
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int ret;
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wl1271_debug(DEBUG_EVENT, "EVENT on mbox %d", mbox_num);
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if (mbox_num > 1)
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return -EINVAL;
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/* first we read the mbox descriptor */
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wl1271_read(wl, wl->mbox_ptr[mbox_num], &mbox,
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sizeof(struct event_mailbox), false);
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/* process the descriptor */
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ret = wl1271_event_process(wl, &mbox);
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if (ret < 0)
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return ret;
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/* then we let the firmware know it can go on...*/
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wl1271_write32(wl, ACX_REG_INTERRUPT_TRIG, INTR_TRIG_EVENT_ACK);
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return 0;
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}
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