468 lines
13 KiB
C
468 lines
13 KiB
C
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/*
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* Scan implementation for ST-Ericsson CW1200 mac80211 drivers
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*
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* Copyright (c) 2010, ST-Ericsson
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* Author: Dmitry Tarnyagin <dmitry.tarnyagin@lockless.no>
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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/sched.h>
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#include "cw1200.h"
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#include "scan.h"
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#include "sta.h"
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#include "pm.h"
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static void cw1200_scan_restart_delayed(struct cw1200_common *priv);
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static int cw1200_scan_start(struct cw1200_common *priv, struct wsm_scan *scan)
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{
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int ret, i;
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int tmo = 2000;
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switch (priv->join_status) {
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case CW1200_JOIN_STATUS_PRE_STA:
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case CW1200_JOIN_STATUS_JOINING:
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return -EBUSY;
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default:
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break;
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}
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wiphy_dbg(priv->hw->wiphy, "[SCAN] hw req, type %d, %d channels, flags: 0x%x.\n",
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scan->type, scan->num_channels, scan->flags);
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for (i = 0; i < scan->num_channels; ++i)
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tmo += scan->ch[i].max_chan_time + 10;
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cancel_delayed_work_sync(&priv->clear_recent_scan_work);
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atomic_set(&priv->scan.in_progress, 1);
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atomic_set(&priv->recent_scan, 1);
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cw1200_pm_stay_awake(&priv->pm_state, msecs_to_jiffies(tmo));
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queue_delayed_work(priv->workqueue, &priv->scan.timeout,
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msecs_to_jiffies(tmo));
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ret = wsm_scan(priv, scan);
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if (ret) {
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atomic_set(&priv->scan.in_progress, 0);
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cancel_delayed_work_sync(&priv->scan.timeout);
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cw1200_scan_restart_delayed(priv);
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}
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return ret;
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}
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int cw1200_hw_scan(struct ieee80211_hw *hw,
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struct ieee80211_vif *vif,
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struct ieee80211_scan_request *hw_req)
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{
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struct cw1200_common *priv = hw->priv;
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struct cfg80211_scan_request *req = &hw_req->req;
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struct wsm_template_frame frame = {
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.frame_type = WSM_FRAME_TYPE_PROBE_REQUEST,
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};
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int i, ret;
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if (!priv->vif)
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return -EINVAL;
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/* Scan when P2P_GO corrupt firmware MiniAP mode */
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if (priv->join_status == CW1200_JOIN_STATUS_AP)
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return -EOPNOTSUPP;
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if (req->n_ssids == 1 && !req->ssids[0].ssid_len)
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req->n_ssids = 0;
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wiphy_dbg(hw->wiphy, "[SCAN] Scan request for %d SSIDs.\n",
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req->n_ssids);
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if (req->n_ssids > WSM_SCAN_MAX_NUM_OF_SSIDS)
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return -EINVAL;
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frame.skb = ieee80211_probereq_get(hw, priv->vif->addr, NULL, 0,
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req->ie_len);
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if (!frame.skb)
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return -ENOMEM;
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if (req->ie_len)
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skb_put_data(frame.skb, req->ie, req->ie_len);
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/* will be unlocked in cw1200_scan_work() */
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down(&priv->scan.lock);
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mutex_lock(&priv->conf_mutex);
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ret = wsm_set_template_frame(priv, &frame);
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if (!ret) {
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/* Host want to be the probe responder. */
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ret = wsm_set_probe_responder(priv, true);
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}
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if (ret) {
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mutex_unlock(&priv->conf_mutex);
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up(&priv->scan.lock);
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dev_kfree_skb(frame.skb);
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return ret;
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}
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wsm_lock_tx(priv);
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BUG_ON(priv->scan.req);
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priv->scan.req = req;
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priv->scan.n_ssids = 0;
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priv->scan.status = 0;
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priv->scan.begin = &req->channels[0];
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priv->scan.curr = priv->scan.begin;
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priv->scan.end = &req->channels[req->n_channels];
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priv->scan.output_power = priv->output_power;
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for (i = 0; i < req->n_ssids; ++i) {
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struct wsm_ssid *dst = &priv->scan.ssids[priv->scan.n_ssids];
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memcpy(&dst->ssid[0], req->ssids[i].ssid, sizeof(dst->ssid));
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dst->length = req->ssids[i].ssid_len;
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++priv->scan.n_ssids;
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}
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mutex_unlock(&priv->conf_mutex);
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if (frame.skb)
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dev_kfree_skb(frame.skb);
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queue_work(priv->workqueue, &priv->scan.work);
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return 0;
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}
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void cw1200_scan_work(struct work_struct *work)
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{
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struct cw1200_common *priv = container_of(work, struct cw1200_common,
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scan.work);
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struct ieee80211_channel **it;
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struct wsm_scan scan = {
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.type = WSM_SCAN_TYPE_FOREGROUND,
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.flags = WSM_SCAN_FLAG_SPLIT_METHOD,
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};
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bool first_run = (priv->scan.begin == priv->scan.curr &&
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priv->scan.begin != priv->scan.end);
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int i;
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if (first_run) {
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/* Firmware gets crazy if scan request is sent
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* when STA is joined but not yet associated.
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* Force unjoin in this case.
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*/
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if (cancel_delayed_work_sync(&priv->join_timeout) > 0)
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cw1200_join_timeout(&priv->join_timeout.work);
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}
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mutex_lock(&priv->conf_mutex);
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if (first_run) {
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if (priv->join_status == CW1200_JOIN_STATUS_STA &&
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!(priv->powersave_mode.mode & WSM_PSM_PS)) {
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struct wsm_set_pm pm = priv->powersave_mode;
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pm.mode = WSM_PSM_PS;
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cw1200_set_pm(priv, &pm);
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} else if (priv->join_status == CW1200_JOIN_STATUS_MONITOR) {
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/* FW bug: driver has to restart p2p-dev mode
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* after scan
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*/
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cw1200_disable_listening(priv);
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}
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}
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if (!priv->scan.req || (priv->scan.curr == priv->scan.end)) {
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struct cfg80211_scan_info info = {
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.aborted = priv->scan.status ? 1 : 0,
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};
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if (priv->scan.output_power != priv->output_power)
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wsm_set_output_power(priv, priv->output_power * 10);
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if (priv->join_status == CW1200_JOIN_STATUS_STA &&
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!(priv->powersave_mode.mode & WSM_PSM_PS))
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cw1200_set_pm(priv, &priv->powersave_mode);
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if (priv->scan.status < 0)
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wiphy_warn(priv->hw->wiphy,
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"[SCAN] Scan failed (%d).\n",
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priv->scan.status);
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else if (priv->scan.req)
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wiphy_dbg(priv->hw->wiphy,
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"[SCAN] Scan completed.\n");
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else
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wiphy_dbg(priv->hw->wiphy,
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"[SCAN] Scan canceled.\n");
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priv->scan.req = NULL;
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cw1200_scan_restart_delayed(priv);
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wsm_unlock_tx(priv);
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mutex_unlock(&priv->conf_mutex);
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ieee80211_scan_completed(priv->hw, &info);
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up(&priv->scan.lock);
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return;
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} else {
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struct ieee80211_channel *first = *priv->scan.curr;
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for (it = priv->scan.curr + 1, i = 1;
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it != priv->scan.end && i < WSM_SCAN_MAX_NUM_OF_CHANNELS;
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++it, ++i) {
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if ((*it)->band != first->band)
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break;
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if (((*it)->flags ^ first->flags) &
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IEEE80211_CHAN_NO_IR)
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break;
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if (!(first->flags & IEEE80211_CHAN_NO_IR) &&
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(*it)->max_power != first->max_power)
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break;
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}
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scan.band = first->band;
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if (priv->scan.req->no_cck)
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scan.max_tx_rate = WSM_TRANSMIT_RATE_6;
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else
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scan.max_tx_rate = WSM_TRANSMIT_RATE_1;
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scan.num_probes =
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(first->flags & IEEE80211_CHAN_NO_IR) ? 0 : 2;
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scan.num_ssids = priv->scan.n_ssids;
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scan.ssids = &priv->scan.ssids[0];
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scan.num_channels = it - priv->scan.curr;
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/* TODO: Is it optimal? */
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scan.probe_delay = 100;
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/* It is not stated in WSM specification, however
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* FW team says that driver may not use FG scan
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* when joined.
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*/
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if (priv->join_status == CW1200_JOIN_STATUS_STA) {
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scan.type = WSM_SCAN_TYPE_BACKGROUND;
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scan.flags = WSM_SCAN_FLAG_FORCE_BACKGROUND;
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}
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scan.ch = kzalloc(
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sizeof(struct wsm_scan_ch) * (it - priv->scan.curr),
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GFP_KERNEL);
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if (!scan.ch) {
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priv->scan.status = -ENOMEM;
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goto fail;
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}
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for (i = 0; i < scan.num_channels; ++i) {
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scan.ch[i].number = priv->scan.curr[i]->hw_value;
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if (priv->scan.curr[i]->flags & IEEE80211_CHAN_NO_IR) {
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scan.ch[i].min_chan_time = 50;
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scan.ch[i].max_chan_time = 100;
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} else {
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scan.ch[i].min_chan_time = 10;
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scan.ch[i].max_chan_time = 25;
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}
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}
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if (!(first->flags & IEEE80211_CHAN_NO_IR) &&
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priv->scan.output_power != first->max_power) {
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priv->scan.output_power = first->max_power;
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wsm_set_output_power(priv,
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priv->scan.output_power * 10);
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}
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priv->scan.status = cw1200_scan_start(priv, &scan);
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kfree(scan.ch);
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if (priv->scan.status)
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goto fail;
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priv->scan.curr = it;
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}
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mutex_unlock(&priv->conf_mutex);
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return;
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fail:
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priv->scan.curr = priv->scan.end;
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mutex_unlock(&priv->conf_mutex);
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queue_work(priv->workqueue, &priv->scan.work);
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return;
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}
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static void cw1200_scan_restart_delayed(struct cw1200_common *priv)
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{
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/* FW bug: driver has to restart p2p-dev mode after scan. */
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if (priv->join_status == CW1200_JOIN_STATUS_MONITOR) {
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cw1200_enable_listening(priv);
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cw1200_update_filtering(priv);
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}
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if (priv->delayed_unjoin) {
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priv->delayed_unjoin = false;
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if (queue_work(priv->workqueue, &priv->unjoin_work) <= 0)
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wsm_unlock_tx(priv);
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} else if (priv->delayed_link_loss) {
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wiphy_dbg(priv->hw->wiphy, "[CQM] Requeue BSS loss.\n");
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priv->delayed_link_loss = 0;
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cw1200_cqm_bssloss_sm(priv, 1, 0, 0);
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}
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}
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static void cw1200_scan_complete(struct cw1200_common *priv)
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{
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queue_delayed_work(priv->workqueue, &priv->clear_recent_scan_work, HZ);
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if (priv->scan.direct_probe) {
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wiphy_dbg(priv->hw->wiphy, "[SCAN] Direct probe complete.\n");
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cw1200_scan_restart_delayed(priv);
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priv->scan.direct_probe = 0;
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up(&priv->scan.lock);
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wsm_unlock_tx(priv);
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} else {
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cw1200_scan_work(&priv->scan.work);
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}
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}
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void cw1200_scan_failed_cb(struct cw1200_common *priv)
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{
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if (priv->mode == NL80211_IFTYPE_UNSPECIFIED)
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/* STA is stopped. */
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return;
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if (cancel_delayed_work_sync(&priv->scan.timeout) > 0) {
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priv->scan.status = -EIO;
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queue_delayed_work(priv->workqueue, &priv->scan.timeout, 0);
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}
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}
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void cw1200_scan_complete_cb(struct cw1200_common *priv,
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struct wsm_scan_complete *arg)
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{
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if (priv->mode == NL80211_IFTYPE_UNSPECIFIED)
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/* STA is stopped. */
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return;
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if (cancel_delayed_work_sync(&priv->scan.timeout) > 0) {
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priv->scan.status = 1;
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queue_delayed_work(priv->workqueue, &priv->scan.timeout, 0);
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}
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}
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void cw1200_clear_recent_scan_work(struct work_struct *work)
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{
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struct cw1200_common *priv =
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container_of(work, struct cw1200_common,
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clear_recent_scan_work.work);
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atomic_xchg(&priv->recent_scan, 0);
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}
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void cw1200_scan_timeout(struct work_struct *work)
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{
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struct cw1200_common *priv =
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container_of(work, struct cw1200_common, scan.timeout.work);
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if (atomic_xchg(&priv->scan.in_progress, 0)) {
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if (priv->scan.status > 0) {
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priv->scan.status = 0;
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} else if (!priv->scan.status) {
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wiphy_warn(priv->hw->wiphy,
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"Timeout waiting for scan complete notification.\n");
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priv->scan.status = -ETIMEDOUT;
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priv->scan.curr = priv->scan.end;
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wsm_stop_scan(priv);
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}
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|
|
cw1200_scan_complete(priv);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
void cw1200_probe_work(struct work_struct *work)
|
||
|
|
{
|
||
|
|
struct cw1200_common *priv =
|
||
|
|
container_of(work, struct cw1200_common, scan.probe_work.work);
|
||
|
|
u8 queue_id = cw1200_queue_get_queue_id(priv->pending_frame_id);
|
||
|
|
struct cw1200_queue *queue = &priv->tx_queue[queue_id];
|
||
|
|
const struct cw1200_txpriv *txpriv;
|
||
|
|
struct wsm_tx *wsm;
|
||
|
|
struct wsm_template_frame frame = {
|
||
|
|
.frame_type = WSM_FRAME_TYPE_PROBE_REQUEST,
|
||
|
|
};
|
||
|
|
struct wsm_ssid ssids[1] = {{
|
||
|
|
.length = 0,
|
||
|
|
} };
|
||
|
|
struct wsm_scan_ch ch[1] = {{
|
||
|
|
.min_chan_time = 0,
|
||
|
|
.max_chan_time = 10,
|
||
|
|
} };
|
||
|
|
struct wsm_scan scan = {
|
||
|
|
.type = WSM_SCAN_TYPE_FOREGROUND,
|
||
|
|
.num_probes = 1,
|
||
|
|
.probe_delay = 0,
|
||
|
|
.num_channels = 1,
|
||
|
|
.ssids = ssids,
|
||
|
|
.ch = ch,
|
||
|
|
};
|
||
|
|
u8 *ies;
|
||
|
|
size_t ies_len;
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
wiphy_dbg(priv->hw->wiphy, "[SCAN] Direct probe work.\n");
|
||
|
|
|
||
|
|
mutex_lock(&priv->conf_mutex);
|
||
|
|
if (down_trylock(&priv->scan.lock)) {
|
||
|
|
/* Scan is already in progress. Requeue self. */
|
||
|
|
schedule();
|
||
|
|
queue_delayed_work(priv->workqueue, &priv->scan.probe_work,
|
||
|
|
msecs_to_jiffies(100));
|
||
|
|
mutex_unlock(&priv->conf_mutex);
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Make sure we still have a pending probe req */
|
||
|
|
if (cw1200_queue_get_skb(queue, priv->pending_frame_id,
|
||
|
|
&frame.skb, &txpriv)) {
|
||
|
|
up(&priv->scan.lock);
|
||
|
|
mutex_unlock(&priv->conf_mutex);
|
||
|
|
wsm_unlock_tx(priv);
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
wsm = (struct wsm_tx *)frame.skb->data;
|
||
|
|
scan.max_tx_rate = wsm->max_tx_rate;
|
||
|
|
scan.band = (priv->channel->band == NL80211_BAND_5GHZ) ?
|
||
|
|
WSM_PHY_BAND_5G : WSM_PHY_BAND_2_4G;
|
||
|
|
if (priv->join_status == CW1200_JOIN_STATUS_STA ||
|
||
|
|
priv->join_status == CW1200_JOIN_STATUS_IBSS) {
|
||
|
|
scan.type = WSM_SCAN_TYPE_BACKGROUND;
|
||
|
|
scan.flags = WSM_SCAN_FLAG_FORCE_BACKGROUND;
|
||
|
|
}
|
||
|
|
ch[0].number = priv->channel->hw_value;
|
||
|
|
|
||
|
|
skb_pull(frame.skb, txpriv->offset);
|
||
|
|
|
||
|
|
ies = &frame.skb->data[sizeof(struct ieee80211_hdr_3addr)];
|
||
|
|
ies_len = frame.skb->len - sizeof(struct ieee80211_hdr_3addr);
|
||
|
|
|
||
|
|
if (ies_len) {
|
||
|
|
u8 *ssidie =
|
||
|
|
(u8 *)cfg80211_find_ie(WLAN_EID_SSID, ies, ies_len);
|
||
|
|
if (ssidie && ssidie[1] && ssidie[1] <= sizeof(ssids[0].ssid)) {
|
||
|
|
u8 *nextie = &ssidie[2 + ssidie[1]];
|
||
|
|
/* Remove SSID from the IE list. It has to be provided
|
||
|
|
* as a separate argument in cw1200_scan_start call
|
||
|
|
*/
|
||
|
|
|
||
|
|
/* Store SSID localy */
|
||
|
|
ssids[0].length = ssidie[1];
|
||
|
|
memcpy(ssids[0].ssid, &ssidie[2], ssids[0].length);
|
||
|
|
scan.num_ssids = 1;
|
||
|
|
|
||
|
|
/* Remove SSID from IE list */
|
||
|
|
ssidie[1] = 0;
|
||
|
|
memmove(&ssidie[2], nextie, &ies[ies_len] - nextie);
|
||
|
|
skb_trim(frame.skb, frame.skb->len - ssids[0].length);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/* FW bug: driver has to restart p2p-dev mode after scan */
|
||
|
|
if (priv->join_status == CW1200_JOIN_STATUS_MONITOR)
|
||
|
|
cw1200_disable_listening(priv);
|
||
|
|
ret = wsm_set_template_frame(priv, &frame);
|
||
|
|
priv->scan.direct_probe = 1;
|
||
|
|
if (!ret) {
|
||
|
|
wsm_flush_tx(priv);
|
||
|
|
ret = cw1200_scan_start(priv, &scan);
|
||
|
|
}
|
||
|
|
mutex_unlock(&priv->conf_mutex);
|
||
|
|
|
||
|
|
skb_push(frame.skb, txpriv->offset);
|
||
|
|
if (!ret)
|
||
|
|
IEEE80211_SKB_CB(frame.skb)->flags |= IEEE80211_TX_STAT_ACK;
|
||
|
|
BUG_ON(cw1200_queue_remove(queue, priv->pending_frame_id));
|
||
|
|
|
||
|
|
if (ret) {
|
||
|
|
priv->scan.direct_probe = 0;
|
||
|
|
up(&priv->scan.lock);
|
||
|
|
wsm_unlock_tx(priv);
|
||
|
|
}
|
||
|
|
|
||
|
|
return;
|
||
|
|
}
|