ath9k: add support for DFS master mode

These are the remaining knobs in ath9k to support DFS:
* mark AR9280 and AR9580 as DFS tested
* synchronize DFS regulatory domain to reg notifyer
* set required RX filter flags for radar detection
* process radar PHY errors at DFS detector
* notify DFS master on radar detection

DFS support requires CONFIG_ATH9K_DFS_CERTIFIED to be set.

Signed-off-by: Zefir Kurtisi <zefir.kurtisi@neratec.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/drivers/net/wireless/ath/ath9k/dfs.c b/drivers/net/wireless/ath/ath9k/dfs.c
index ecc8179..508f8b3 100644 (file)
--- a/drivers/net/wireless/ath/ath9k/dfs.c
+++ b/drivers/net/wireless/ath/ath9k/dfs.c
@@ -193,9 +193,7 @@ void ath9k_dfs_process_phyerr(struct ath_softc *sc, void *data,
                DFS_STAT_INC(sc, pulses_processed);
                if (pd != NULL && pd->add_pulse(pd, &pe)) {
                        DFS_STAT_INC(sc, radar_detected);
-                       /*
-                        * TODO: forward radar event to DFS management layer
-                        */
+                       ieee80211_radar_detected(sc->hw);
                }
        }
 }

diff --git a/drivers/net/wireless/ath/ath9k/hw.c b/drivers/net/wireless/ath/ath9k/hw.c
index 4fa2bb1..3473a79 100644 (file)
--- a/drivers/net/wireless/ath/ath9k/hw.c
+++ b/drivers/net/wireless/ath/ath9k/hw.c
@@ -2380,8 +2380,11 @@ static bool ath9k_hw_dfs_tested(struct ath_hw *ah)
 {
 
        switch (ah->hw_version.macVersion) {
+       /* for temporary testing DFS with 9280 */
+       case AR_SREV_VERSION_9280:
        /* AR9580 will likely be our first target to get testing on */
        case AR_SREV_VERSION_9580:
+               return true;
        default:
                return false;
        }

diff --git a/drivers/net/wireless/ath/ath9k/init.c b/drivers/net/wireless/ath/ath9k/init.c
index 385c59a..3be2eb0 100644 (file)
--- a/drivers/net/wireless/ath/ath9k/init.c
+++ b/drivers/net/wireless/ath/ath9k/init.c
@@ -319,6 +319,10 @@ static void ath9k_reg_notifier(struct wiphy *wiphy,
                ath9k_ps_wakeup(sc);
                ath9k_hw_set_txpowerlimit(ah, sc->config.txpowlimit, false);
                sc->curtxpow = ath9k_hw_regulatory(ah)->power_limit;
+               /* synchronize DFS detector if regulatory domain changed */
+               if (sc->dfs_detector != NULL)
+                       sc->dfs_detector->set_dfs_domain(sc->dfs_detector,
+                                                        request->dfs_region);
                ath9k_ps_restore(sc);
        }
 }

diff --git a/drivers/net/wireless/ath/ath9k/main.c b/drivers/net/wireless/ath/ath9k/main.c
index 24650fd..2d25148 100644 (file)
--- a/drivers/net/wireless/ath/ath9k/main.c
+++ b/drivers/net/wireless/ath/ath9k/main.c
@@ -1245,10 +1245,27 @@ static int ath9k_config(struct ieee80211_hw *hw, u32 changed)
                if (old_pos >= 0)
                        ath_update_survey_nf(sc, old_pos);
 
-               /* perform spectral scan if requested. */
-               if (sc->scanning && sc->spectral_mode == SPECTRAL_CHANSCAN)
-                       ath9k_spectral_scan_trigger(hw);
-
+               /*
+                * Enable radar pulse detection if on a DFS channel. Spectral
+                * scanning and radar detection can not be used concurrently.
+                */
+               if (hw->conf.radar_enabled) {
+                       u32 rxfilter;
+
+                       /* set HW specific DFS configuration */
+                       ath9k_hw_set_radar_params(ah);
+                       rxfilter = ath9k_hw_getrxfilter(ah);
+                       rxfilter |= ATH9K_RX_FILTER_PHYRADAR |
+                                   ATH9K_RX_FILTER_PHYERR;
+                       ath9k_hw_setrxfilter(ah, rxfilter);
+                       ath_dbg(common, DFS, "DFS enabled at freq %d\n",
+                               curchan->center_freq);
+               } else {
+                       /* perform spectral scan if requested. */
+                       if (sc->scanning &&
+                           sc->spectral_mode == SPECTRAL_CHANSCAN)
+                               ath9k_spectral_scan_trigger(hw);
+               }
        }
 
        if (changed & IEEE80211_CONF_CHANGE_POWER) {

diff --git a/drivers/net/wireless/ath/ath9k/recv.c b/drivers/net/wireless/ath/ath9k/recv.c
index ee156e5..ee7ca5a 100644 (file)
--- a/drivers/net/wireless/ath/ath9k/recv.c
+++ b/drivers/net/wireless/ath/ath9k/recv.c
@@ -381,6 +381,10 @@ u32 ath_calcrxfilter(struct ath_softc *sc)
        rfilt = ATH9K_RX_FILTER_UCAST | ATH9K_RX_FILTER_BCAST
                | ATH9K_RX_FILTER_MCAST;
 
+       /* if operating on a DFS channel, enable radar pulse detection */
+       if (sc->hw->conf.radar_enabled)
+               rfilt |= ATH9K_RX_FILTER_PHYRADAR | ATH9K_RX_FILTER_PHYERR;
+
        if (sc->rx.rxfilter & FIF_PROBE_REQ)
                rfilt |= ATH9K_RX_FILTER_PROBEREQ;
 
@@ -1228,6 +1232,9 @@ int ath_rx_tasklet(struct ath_softc *sc, int flush, bool hp)
                    unlikely(tsf_lower - rs.rs_tstamp > 0x10000000))
                        rxs->mactime += 0x100000000ULL;
 
+               if (rs.rs_phyerr == ATH9K_PHYERR_RADAR)
+                       ath9k_dfs_process_phyerr(sc, hdr, &rs, rxs->mactime);
+
                if (rs.rs_status & ATH9K_RXERR_PHY) {
                        if (ath_process_fft(sc, hdr, &rs, rxs->mactime)) {
                                RX_STAT_INC(rx_spectral);