ath9k: clean up processing of pending tx frames on reset

Dropping packets from aggregation sessions is usually not a good idea, as
it might upset the synchronization of the BlockAck receive window of the
remote node. The use of the retry_tx parameter to reset/tx-drain functions
also seemed a bit arbitrary.
This patch removes this parameter altogether and ensures that pending tx
frames are not dropped for no good reason.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/drivers/net/wireless/ath/ath9k/ath9k.h b/drivers/net/wireless/ath/ath9k/ath9k.h
index 094a932..885affd 100644 (file)
--- a/drivers/net/wireless/ath/ath9k/ath9k.h
+++ b/drivers/net/wireless/ath/ath9k/ath9k.h
@@ -334,9 +334,8 @@ void ath_txq_lock(struct ath_softc *sc, struct ath_txq *txq);
 void ath_txq_unlock(struct ath_softc *sc, struct ath_txq *txq);
 void ath_txq_unlock_complete(struct ath_softc *sc, struct ath_txq *txq);
 void ath_tx_cleanupq(struct ath_softc *sc, struct ath_txq *txq);
-bool ath_drain_all_txq(struct ath_softc *sc, bool retry_tx);
-void ath_draintxq(struct ath_softc *sc,
-                    struct ath_txq *txq, bool retry_tx);
+bool ath_drain_all_txq(struct ath_softc *sc);
+void ath_draintxq(struct ath_softc *sc, struct ath_txq *txq);
 void ath_tx_node_init(struct ath_softc *sc, struct ath_node *an);
 void ath_tx_node_cleanup(struct ath_softc *sc, struct ath_node *an);
 void ath_txq_schedule(struct ath_softc *sc, struct ath_txq *txq);

diff --git a/drivers/net/wireless/ath/ath9k/beacon.c b/drivers/net/wireless/ath/ath9k/beacon.c
index 531fffd..a129f83 100644 (file)
--- a/drivers/net/wireless/ath/ath9k/beacon.c
+++ b/drivers/net/wireless/ath/ath9k/beacon.c
@@ -198,7 +198,7 @@ static struct ath_buf *ath9k_beacon_generate(struct ieee80211_hw *hw,
                if (sc->nvifs > 1) {
                        ath_dbg(common, BEACON,
                                "Flushing previous cabq traffic\n");
-                       ath_draintxq(sc, cabq, false);
+                       ath_draintxq(sc, cabq);
                }
        }
 

diff --git a/drivers/net/wireless/ath/ath9k/main.c b/drivers/net/wireless/ath/ath9k/main.c
index 407199b..3e5082c 100644 (file)
--- a/drivers/net/wireless/ath/ath9k/main.c
+++ b/drivers/net/wireless/ath/ath9k/main.c
@@ -182,7 +182,7 @@ static void ath_restart_work(struct ath_softc *sc)
        ath_start_ani(sc);
 }
 
-static bool ath_prepare_reset(struct ath_softc *sc, bool retry_tx, bool flush)
+static bool ath_prepare_reset(struct ath_softc *sc, bool flush)
 {
        struct ath_hw *ah = sc->sc_ah;
        bool ret = true;
@@ -196,7 +196,7 @@ static bool ath_prepare_reset(struct ath_softc *sc, bool retry_tx, bool flush)
        ath9k_debug_samp_bb_mac(sc);
        ath9k_hw_disable_interrupts(ah);
 
-       if (!ath_drain_all_txq(sc, retry_tx))
+       if (!ath_drain_all_txq(sc))
                ret = false;
 
        if (!ath_stoprecv(sc))
@@ -255,8 +255,7 @@ static bool ath_complete_reset(struct ath_softc *sc, bool start)
        return true;
 }
 
-static int ath_reset_internal(struct ath_softc *sc, struct ath9k_channel *hchan,
-                             bool retry_tx)
+static int ath_reset_internal(struct ath_softc *sc, struct ath9k_channel *hchan)
 {
        struct ath_hw *ah = sc->sc_ah;
        struct ath_common *common = ath9k_hw_common(ah);
@@ -280,7 +279,7 @@ static int ath_reset_internal(struct ath_softc *sc, struct ath9k_channel *hchan,
                hchan = ah->curchan;
        }
 
-       if (!ath_prepare_reset(sc, retry_tx, flush))
+       if (!ath_prepare_reset(sc, flush))
                fastcc = false;
 
        ath_dbg(common, CONFIG, "Reset to %u MHz, HT40: %d fastcc: %d\n",
@@ -319,7 +318,7 @@ static int ath_set_channel(struct ath_softc *sc, struct ieee80211_hw *hw,
        if (test_bit(SC_OP_INVALID, &sc->sc_flags))
                return -EIO;
 
-       r = ath_reset_internal(sc, hchan, false);
+       r = ath_reset_internal(sc, hchan);
 
        return r;
 }
@@ -549,23 +548,21 @@ chip_reset:
 #undef SCHED_INTR
 }
 
-static int ath_reset(struct ath_softc *sc, bool retry_tx)
+static int ath_reset(struct ath_softc *sc)
 {
-       int r;
+       int i, r;
 
        ath9k_ps_wakeup(sc);
 
-       r = ath_reset_internal(sc, NULL, retry_tx);
+       r = ath_reset_internal(sc, NULL);
 
-       if (retry_tx) {
-               int i;
-               for (i = 0; i < ATH9K_NUM_TX_QUEUES; i++) {
-                       if (ATH_TXQ_SETUP(sc, i)) {
-                               spin_lock_bh(&sc->tx.txq[i].axq_lock);
-                               ath_txq_schedule(sc, &sc->tx.txq[i]);
-                               spin_unlock_bh(&sc->tx.txq[i].axq_lock);
-                       }
-               }
+       for (i = 0; i < ATH9K_NUM_TX_QUEUES; i++) {
+               if (!ATH_TXQ_SETUP(sc, i))
+                       continue;
+
+               spin_lock_bh(&sc->tx.txq[i].axq_lock);
+               ath_txq_schedule(sc, &sc->tx.txq[i]);
+               spin_unlock_bh(&sc->tx.txq[i].axq_lock);
        }
 
        ath9k_ps_restore(sc);
@@ -586,7 +583,7 @@ void ath_reset_work(struct work_struct *work)
 {
        struct ath_softc *sc = container_of(work, struct ath_softc, hw_reset_work);
 
-       ath_reset(sc, true);
+       ath_reset(sc);
 }
 
 /**********************/
@@ -804,7 +801,7 @@ static void ath9k_stop(struct ieee80211_hw *hw)
                ath9k_hw_cfg_gpio_input(ah, ah->led_pin);
        }
 
-       ath_prepare_reset(sc, false, true);
+       ath_prepare_reset(sc, true);
 
        if (sc->rx.frag) {
                dev_kfree_skb_any(sc->rx.frag);
@@ -1816,11 +1813,11 @@ static void ath9k_flush(struct ieee80211_hw *hw, bool drop)
        if (drop) {
                ath9k_ps_wakeup(sc);
                spin_lock_bh(&sc->sc_pcu_lock);
-               drain_txq = ath_drain_all_txq(sc, false);
+               drain_txq = ath_drain_all_txq(sc);
                spin_unlock_bh(&sc->sc_pcu_lock);
 
                if (!drain_txq)
-                       ath_reset(sc, false);
+                       ath_reset(sc);
 
                ath9k_ps_restore(sc);
                ieee80211_wake_queues(hw);

diff --git a/drivers/net/wireless/ath/ath9k/xmit.c b/drivers/net/wireless/ath/ath9k/xmit.c
index ca4a034..ac9ee67 100644 (file)
--- a/drivers/net/wireless/ath/ath9k/xmit.c
+++ b/drivers/net/wireless/ath/ath9k/xmit.c
@@ -378,7 +378,7 @@ static void ath_tx_count_frames(struct ath_softc *sc, struct ath_buf *bf,
 
 static void ath_tx_complete_aggr(struct ath_softc *sc, struct ath_txq *txq,
                                 struct ath_buf *bf, struct list_head *bf_q,
-                                struct ath_tx_status *ts, int txok, bool retry)
+                                struct ath_tx_status *ts, int txok)
 {
        struct ath_node *an = NULL;
        struct sk_buff *skb;
@@ -490,7 +490,7 @@ static void ath_tx_complete_aggr(struct ath_softc *sc, struct ath_txq *txq,
                } else if (!isaggr && txok) {
                        /* transmit completion */
                        acked_cnt++;
-               } else if ((tid->state & AGGR_CLEANUP) || !retry) {
+               } else if (tid->state & AGGR_CLEANUP) {
                        /*
                         * cleanup in progress, just fail
                         * the un-acked sub-frames
@@ -1331,23 +1331,6 @@ void ath_tx_aggr_resume(struct ath_softc *sc, struct ieee80211_sta *sta, u16 tid
 /* Queue Management */
 /********************/
 
-static void ath_txq_drain_pending_buffers(struct ath_softc *sc,
-                                         struct ath_txq *txq)
-{
-       struct ath_atx_ac *ac, *ac_tmp;
-       struct ath_atx_tid *tid, *tid_tmp;
-
-       list_for_each_entry_safe(ac, ac_tmp, &txq->axq_acq, list) {
-               list_del(&ac->list);
-               ac->sched = false;
-               list_for_each_entry_safe(tid, tid_tmp, &ac->tid_q, list) {
-                       list_del(&tid->list);
-                       tid->sched = false;
-                       ath_tid_drain(sc, txq, tid);
-               }
-       }
-}
-
 struct ath_txq *ath_txq_setup(struct ath_softc *sc, int qtype, int subtype)
 {
        struct ath_hw *ah = sc->sc_ah;
@@ -1477,7 +1460,7 @@ static bool bf_is_ampdu_not_probing(struct ath_buf *bf)
 }
 
 static void ath_drain_txq_list(struct ath_softc *sc, struct ath_txq *txq,
-                              struct list_head *list, bool retry_tx)
+                              struct list_head *list)
 {
        struct ath_buf *bf, *lastbf;
        struct list_head bf_head;
@@ -1505,8 +1488,7 @@ static void ath_drain_txq_list(struct ath_softc *sc, struct ath_txq *txq,
                        txq->axq_ampdu_depth--;
 
                if (bf_isampdu(bf))
-                       ath_tx_complete_aggr(sc, txq, bf, &bf_head, &ts, 0,
-                                            retry_tx);
+                       ath_tx_complete_aggr(sc, txq, bf, &bf_head, &ts, 0);
                else
                        ath_tx_complete_buf(sc, bf, txq, &bf_head, &ts, 0);
        }
@@ -1518,7 +1500,7 @@ static void ath_drain_txq_list(struct ath_softc *sc, struct ath_txq *txq,
  * This assumes output has been stopped and
  * we do not need to block ath_tx_tasklet.
  */
-void ath_draintxq(struct ath_softc *sc, struct ath_txq *txq, bool retry_tx)
+void ath_draintxq(struct ath_softc *sc, struct ath_txq *txq)
 {
        ath_txq_lock(sc, txq);
 
@@ -1526,8 +1508,7 @@ void ath_draintxq(struct ath_softc *sc, struct ath_txq *txq, bool retry_tx)
                int idx = txq->txq_tailidx;
 
                while (!list_empty(&txq->txq_fifo[idx])) {
-                       ath_drain_txq_list(sc, txq, &txq->txq_fifo[idx],
-                                          retry_tx);
+                       ath_drain_txq_list(sc, txq, &txq->txq_fifo[idx]);
 
                        INCR(idx, ATH_TXFIFO_DEPTH);
                }
@@ -1536,16 +1517,12 @@ void ath_draintxq(struct ath_softc *sc, struct ath_txq *txq, bool retry_tx)
 
        txq->axq_link = NULL;
        txq->axq_tx_inprogress = false;
-       ath_drain_txq_list(sc, txq, &txq->axq_q, retry_tx);
-
-       /* flush any pending frames if aggregation is enabled */
-       if ((sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_HT) && !retry_tx)
-               ath_txq_drain_pending_buffers(sc, txq);
+       ath_drain_txq_list(sc, txq, &txq->axq_q);
 
        ath_txq_unlock_complete(sc, txq);
 }
 
-bool ath_drain_all_txq(struct ath_softc *sc, bool retry_tx)
+bool ath_drain_all_txq(struct ath_softc *sc)
 {
        struct ath_hw *ah = sc->sc_ah;
        struct ath_common *common = ath9k_hw_common(sc->sc_ah);
@@ -1581,7 +1558,7 @@ bool ath_drain_all_txq(struct ath_softc *sc, bool retry_tx)
                 */
                txq = &sc->tx.txq[i];
                txq->stopped = false;
-               ath_draintxq(sc, txq, retry_tx);
+               ath_draintxq(sc, txq);
        }
 
        return !npend;
@@ -2191,7 +2168,7 @@ static void ath_tx_process_buffer(struct ath_softc *sc, struct ath_txq *txq,
                ath_tx_rc_status(sc, bf, ts, 1, txok ? 0 : 1, txok);
                ath_tx_complete_buf(sc, bf, txq, bf_head, ts, txok);
        } else
-               ath_tx_complete_aggr(sc, txq, bf, bf_head, ts, txok, true);
+               ath_tx_complete_aggr(sc, txq, bf, bf_head, ts, txok);
 
        if (sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_HT)
                ath_txq_schedule(sc, txq);