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ath9k: fix various aggregation related race conditions
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@23097 3c298f89-4303-0410-b956-a3cf2f4a3e73
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nbd
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52
package/mac80211/patches/521-ath9k_aggr_race_fix.patch
Normal file
52
package/mac80211/patches/521-ath9k_aggr_race_fix.patch
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@ -0,0 +1,52 @@
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--- a/drivers/net/wireless/ath/ath9k/xmit.c
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+++ b/drivers/net/wireless/ath/ath9k/xmit.c
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@@ -784,17 +784,23 @@ static void ath_tx_sched_aggr(struct ath
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status != ATH_AGGR_BAW_CLOSED);
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}
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-void ath_tx_aggr_start(struct ath_softc *sc, struct ieee80211_sta *sta,
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- u16 tid, u16 *ssn)
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+int ath_tx_aggr_start(struct ath_softc *sc, struct ieee80211_sta *sta,
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+ u16 tid, u16 *ssn)
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{
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struct ath_atx_tid *txtid;
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struct ath_node *an;
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an = (struct ath_node *)sta->drv_priv;
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txtid = ATH_AN_2_TID(an, tid);
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+
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+ if (txtid->state & (AGGR_CLEANUP | AGGR_ADDBA_COMPLETE))
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+ return -EAGAIN;
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+
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txtid->state |= AGGR_ADDBA_PROGRESS;
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txtid->paused = true;
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*ssn = txtid->seq_start;
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+
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+ return 0;
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}
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void ath_tx_aggr_stop(struct ath_softc *sc, struct ieee80211_sta *sta, u16 tid)
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--- a/drivers/net/wireless/ath/ath9k/ath9k.h
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+++ b/drivers/net/wireless/ath/ath9k/ath9k.h
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@@ -346,8 +346,8 @@ void ath_tx_tasklet(struct ath_softc *sc
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void ath_tx_edma_tasklet(struct ath_softc *sc);
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void ath_tx_cabq(struct ieee80211_hw *hw, struct sk_buff *skb);
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bool ath_tx_aggr_check(struct ath_softc *sc, struct ath_node *an, u8 tidno);
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-void ath_tx_aggr_start(struct ath_softc *sc, struct ieee80211_sta *sta,
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- u16 tid, u16 *ssn);
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+int ath_tx_aggr_start(struct ath_softc *sc, struct ieee80211_sta *sta,
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+ u16 tid, u16 *ssn);
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void ath_tx_aggr_stop(struct ath_softc *sc, struct ieee80211_sta *sta, u16 tid);
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void ath_tx_aggr_resume(struct ath_softc *sc, struct ieee80211_sta *sta, u16 tid);
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void ath9k_enable_ps(struct ath_softc *sc);
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--- a/drivers/net/wireless/ath/ath9k/main.c
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+++ b/drivers/net/wireless/ath/ath9k/main.c
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@@ -1968,7 +1968,7 @@ static int ath9k_ampdu_action(struct iee
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break;
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case IEEE80211_AMPDU_TX_START:
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ath9k_ps_wakeup(sc);
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- ath_tx_aggr_start(sc, sta, tid, ssn);
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+ ret = ath_tx_aggr_start(sc, sta, tid, ssn);
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ieee80211_start_tx_ba_cb_irqsafe(vif, sta->addr, tid);
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ath9k_ps_restore(sc);
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break;
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131
package/mac80211/patches/522-ath9k_aggr_flush.patch
Normal file
131
package/mac80211/patches/522-ath9k_aggr_flush.patch
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@ -0,0 +1,131 @@
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--- a/drivers/net/wireless/ath/ath9k/xmit.c
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+++ b/drivers/net/wireless/ath/ath9k/xmit.c
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@@ -61,6 +61,8 @@ static int ath_tx_num_badfrms(struct ath
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struct ath_tx_status *ts, int txok);
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static void ath_tx_rc_status(struct ath_buf *bf, struct ath_tx_status *ts,
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int nbad, int txok, bool update_rc);
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+static void ath_tx_update_baw(struct ath_softc *sc, struct ath_atx_tid *tid,
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+ int seqno);
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enum {
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MCS_HT20,
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@@ -144,18 +146,23 @@ static void ath_tx_flush_tid(struct ath_
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struct ath_txq *txq = &sc->tx.txq[tid->ac->qnum];
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struct ath_buf *bf;
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struct list_head bf_head;
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- INIT_LIST_HEAD(&bf_head);
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+ struct ath_tx_status ts;
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- WARN_ON(!tid->paused);
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+ INIT_LIST_HEAD(&bf_head);
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+ memset(&ts, 0, sizeof(ts));
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spin_lock_bh(&txq->axq_lock);
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- tid->paused = false;
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while (!list_empty(&tid->buf_q)) {
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bf = list_first_entry(&tid->buf_q, struct ath_buf, list);
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- BUG_ON(bf_isretried(bf));
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list_move_tail(&bf->list, &bf_head);
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- ath_tx_send_ht_normal(sc, txq, tid, &bf_head);
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+
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+ if (bf_isretried(bf)) {
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+ ath_tx_update_baw(sc, tid, bf->bf_seqno);
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+ ath_tx_complete_buf(sc, bf, txq, &bf_head, &ts, 0, 0);
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+ } else {
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+ ath_tx_send_ht_normal(sc, txq, tid, &bf_head);
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+ }
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}
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spin_unlock_bh(&txq->axq_lock);
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@@ -430,7 +437,7 @@ static void ath_tx_complete_aggr(struct
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list_move_tail(&bf->list, &bf_head);
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}
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- if (!txpending) {
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+ if (!txpending || (tid->state & AGGR_CLEANUP)) {
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/*
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* complete the acked-ones/xretried ones; update
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* block-ack window
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@@ -451,6 +458,7 @@ static void ath_tx_complete_aggr(struct
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!txfail, sendbar);
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} else {
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/* retry the un-acked ones */
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+
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if (!(sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_EDMA)) {
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if (bf->bf_next == NULL && bf_last->bf_stale) {
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struct ath_buf *tbf;
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@@ -509,15 +517,12 @@ static void ath_tx_complete_aggr(struct
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}
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if (tid->state & AGGR_CLEANUP) {
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+ ath_tx_flush_tid(sc, tid);
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+
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if (tid->baw_head == tid->baw_tail) {
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tid->state &= ~AGGR_ADDBA_COMPLETE;
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tid->state &= ~AGGR_CLEANUP;
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-
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- /* send buffered frames as singles */
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- ath_tx_flush_tid(sc, tid);
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}
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- rcu_read_unlock();
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- return;
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}
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rcu_read_unlock();
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@@ -808,12 +813,6 @@ void ath_tx_aggr_stop(struct ath_softc *
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struct ath_node *an = (struct ath_node *)sta->drv_priv;
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struct ath_atx_tid *txtid = ATH_AN_2_TID(an, tid);
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struct ath_txq *txq = &sc->tx.txq[txtid->ac->qnum];
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- struct ath_tx_status ts;
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- struct ath_buf *bf;
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- struct list_head bf_head;
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-
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- memset(&ts, 0, sizeof(ts));
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- INIT_LIST_HEAD(&bf_head);
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if (txtid->state & AGGR_CLEANUP)
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return;
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@@ -823,31 +822,22 @@ void ath_tx_aggr_stop(struct ath_softc *
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return;
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}
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- /* drop all software retried frames and mark this TID */
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spin_lock_bh(&txq->axq_lock);
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txtid->paused = true;
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- while (!list_empty(&txtid->buf_q)) {
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- bf = list_first_entry(&txtid->buf_q, struct ath_buf, list);
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- if (!bf_isretried(bf)) {
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- /*
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- * NB: it's based on the assumption that
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- * software retried frame will always stay
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- * at the head of software queue.
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- */
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- break;
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- }
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- list_move_tail(&bf->list, &bf_head);
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- ath_tx_update_baw(sc, txtid, bf->bf_seqno);
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- ath_tx_complete_buf(sc, bf, txq, &bf_head, &ts, 0, 0);
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- }
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- spin_unlock_bh(&txq->axq_lock);
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- if (txtid->baw_head != txtid->baw_tail) {
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+ /*
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+ * If frames are still being transmitted for this TID, they will be
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+ * cleaned up during tx completion. To prevent race conditions, this
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+ * TID can only be reused after all in-progress subframes have been
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+ * completed.
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+ */
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+ if (txtid->baw_head != txtid->baw_tail)
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txtid->state |= AGGR_CLEANUP;
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- } else {
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+ else
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txtid->state &= ~AGGR_ADDBA_COMPLETE;
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- ath_tx_flush_tid(sc, txtid);
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- }
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+ spin_unlock_bh(&txq->axq_lock);
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+
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+ ath_tx_flush_tid(sc, txtid);
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}
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void ath_tx_aggr_resume(struct ath_softc *sc, struct ieee80211_sta *sta, u16 tid)
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