event.c

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/*
 * This file is part of wl1271
 *
 * Copyright (C) 2008-2009 Nokia Corporation
 *
 * Contact: Luciano Coelho <[email protected]>
 *
 * 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;
    int ret;

    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.");

        /*
         * if the work is already queued, it should take place. We
         * don't want to delay the connection loss indication
         * any more.
         */
        ieee80211_queue_delayed_work(wl->hw, &wl->connection_loss_work,
                         msecs_to_jiffies(delay));

        wl12xx_for_each_wlvif_sta(wl, wlvif) {
            vif = wl12xx_wlvif_to_vif(wlvif);

            ieee80211_cqm_rssi_notify(
                    vif,
                    NL80211_CQM_RSSI_BEACON_LOSS_EVENT,
                    GFP_KERNEL);
        }
    }

    if (vector & REGAINED_BSS_EVENT_ID) {
        /* TODO: check for multi-role */
        wl1271_info("Beacon regained.");
        cancel_delayed_work(&wl->connection_loss_work);

        /* sanity check - we can't lose and gain the beacon together */
        WARN(vector & BSS_LOSE_EVENT_ID,
             "Concurrent beacon loss and gain from FW");
    }

    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");
        ret = wl1271_tx_dummy_packet(wl);
        if (ret < 0)
            return ret;
    }

    /*
     * "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 */
    ret = wlcore_read(wl, wl->mbox_ptr[mbox_num], wl->mbox,
              sizeof(*wl->mbox), false);
    if (ret < 0)
        return ret;

    /* 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?
     */
    ret = wl->ops->ack_event(wl);

    return ret;
}