ath9k: remove VEOL support for ad-hoc

With VEOL, Beacon transmission in ad-hoc does not currently work.
I believe for larger ad-hoc networks, VEOL is too unreliable, as
it can get beacon transmissions stuck during synchronization.
Use SWBA based beacon trasmission similar to AP mode instead.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Acked-by: Benoit Papillault <benoit.papillault@free.fr>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 10 insertions, 53 deletions

diff --git a/drivers/net/wireless/ath/ath9k/beacon.c b/drivers/net/wireless/ath/ath9k/beacon.c
index 77face76e05f..f43d85a302c4 100644
--- a/drivers/net/wireless/ath/ath9k/beacon.c
+++ b/drivers/net/wireless/ath/ath9k/beacon.c
@@ -76,22 +76,13 @@ static void ath_beacon_setup(struct ath_softc *sc, struct ath_vif *avp,
         ds = bf->bf_desc;
         flags = ATH9K_TXDESC_NOACK;
 
-        if (((sc->sc_ah->opmode == NL80211_IFTYPE_ADHOC) ||
-             (sc->sc_ah->opmode == NL80211_IFTYPE_MESH_POINT)) &&
-            (ah->caps.hw_caps & ATH9K_HW_CAP_VEOL)) {
-                ds->ds_link = bf->bf_daddr; /* self-linked */
-                flags |= ATH9K_TXDESC_VEOL;
-                /* Let hardware handle antenna switching. */
-                antenna = 0;
-        } else {
-                ds->ds_link = 0;
-                /*
-                 * Switch antenna every beacon.
-                 * Should only switch every beacon period, not for every SWBA
-                 * XXX assumes two antennae
-                 */
-                antenna = ((sc->beacon.ast_be_xmit / sc->nbcnvifs) & 1 ? 2 : 1);
-        }
+        ds->ds_link = 0;
+        /*
+         * Switch antenna every beacon.
+         * Should only switch every beacon period, not for every SWBA
+         * XXX assumes two antennae
+         */
+        antenna = ((sc->beacon.ast_be_xmit / sc->nbcnvifs) & 1 ? 2 : 1);
 
         sband = &sc->sbands[common->hw->conf.channel->band];
         rate = sband->bitrates[rateidx].hw_value;
@@ -215,36 +206,6 @@ static struct ath_buf *ath_beacon_generate(struct ieee80211_hw *hw,
         return bf;
 }
 
-/*
- * Startup beacon transmission for adhoc mode when they are sent entirely
- * by the hardware using the self-linked descriptor + veol trick.
-*/
-static void ath_beacon_start_adhoc(struct ath_softc *sc,
-                                   struct ieee80211_vif *vif)
-{
-        struct ath_hw *ah = sc->sc_ah;
-        struct ath_common *common = ath9k_hw_common(ah);
-        struct ath_buf *bf;
-        struct ath_vif *avp;
-        struct sk_buff *skb;
-
-        avp = (void *)vif->drv_priv;
-
-        if (avp->av_bcbuf == NULL)
-                return;
-
-        bf = avp->av_bcbuf;
-        skb = bf->bf_mpdu;
-
-        ath_beacon_setup(sc, avp, bf, 0);
-
-        /* NB: caller is known to have already stopped tx dma */
-        ath9k_hw_puttxbuf(ah, sc->beacon.beaconq, bf->bf_daddr);
-        ath9k_hw_txstart(ah, sc->beacon.beaconq);
-        ath_print(common, ATH_DBG_BEACON, "TXDP%u = %llx (%p)\n",
-                  sc->beacon.beaconq, ito64(bf->bf_daddr), bf->bf_desc);
-}
-
 int ath_beacon_alloc(struct ath_wiphy *aphy, struct ieee80211_vif *vif)
 {
         struct ath_softc *sc = aphy->sc;
@@ -265,7 +226,8 @@ int ath_beacon_alloc(struct ath_wiphy *aphy, struct ieee80211_vif *vif)
                 list_del(&avp->av_bcbuf->list);
 
                 if (sc->sc_ah->opmode == NL80211_IFTYPE_AP ||
-                    !(sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_VEOL)) {
+                    sc->sc_ah->opmode == NL80211_IFTYPE_ADHOC ||
+                    sc->sc_ah->opmode == NL80211_IFTYPE_MESH_POINT) {
                         int slot;
                         /*
                          * Assign the vif to a beacon xmit slot. As
@@ -715,8 +677,7 @@ static void ath_beacon_config_adhoc(struct ath_softc *sc,
          * self-linked tx descriptor and let the hardware deal with things.
          */
         intval |= ATH9K_BEACON_ENA;
-        if (!(ah->caps.hw_caps & ATH9K_HW_CAP_VEOL))
-                ah->imask |= ATH9K_INT_SWBA;
+        ah->imask |= ATH9K_INT_SWBA;
 
         ath_beaconq_config(sc);
 
@@ -726,10 +687,6 @@ static void ath_beacon_config_adhoc(struct ath_softc *sc,
         ath9k_beacon_init(sc, nexttbtt, intval);
         sc->beacon.bmisscnt = 0;
         ath9k_hw_set_interrupts(ah, ah->imask);
-
-        /* FIXME: Handle properly when vif is NULL */
-        if (vif && ah->caps.hw_caps & ATH9K_HW_CAP_VEOL)
-                ath_beacon_start_adhoc(sc, vif);
 }
 
 void ath_beacon_config(struct ath_softc *sc, struct ieee80211_vif *vif)