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authorFelix Fietkau <nbd@nbd.name>2017-02-12 13:25:08 +0100
committerFelix Fietkau <nbd@nbd.name>2017-02-12 14:27:41 +0100
commit764cd09dd845864b0d45c6b1f914b81612a5dd28 (patch)
tree0dcc26c0559d0d49cf016248fda1e5a915f4ee34 /package/kernel/mac80211
parent5c651b029e2dfb5cc68b8803bf550e62da643289 (diff)
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ath9k: fix various issues in the airtime-fairness implementation
Effects of the bugs could include memory corruption, tx hangs, kernel crahes, possibly other things as well Signed-off-by: Felix Fietkau <nbd@nbd.name>
Diffstat (limited to 'package/kernel/mac80211')
-rw-r--r--package/kernel/mac80211/patches/320-ath9k-clean-up-and-fix-ath_tx_count_airtime.patch107
1 files changed, 107 insertions, 0 deletions
diff --git a/package/kernel/mac80211/patches/320-ath9k-clean-up-and-fix-ath_tx_count_airtime.patch b/package/kernel/mac80211/patches/320-ath9k-clean-up-and-fix-ath_tx_count_airtime.patch
new file mode 100644
index 0000000000..a6a3bfca6d
--- /dev/null
+++ b/package/kernel/mac80211/patches/320-ath9k-clean-up-and-fix-ath_tx_count_airtime.patch
@@ -0,0 +1,107 @@
+From: Felix Fietkau <nbd@nbd.name>
+Date: Sun, 12 Feb 2017 13:13:05 +0100
+Subject: [PATCH] ath9k: clean up and fix ath_tx_count_airtime
+
+ath_tx_count_airtime is doing a lot of unnecessary work:
+
+- Redundant station lookup
+- Redundant rcu_read_lock/unlock
+- Useless memcpy of bf->rates
+- Useless NULL check of bf->bf_mpdu
+- Redundant lookup of the skb tid
+
+Additionally, it tries to look up the mac80211 queue index from the txq,
+which fails if the frame was delivered via the power save queue.
+
+This patch fixes all of these issues by passing down the right set of
+pointers instead of doing extra work
+
+Cc: stable@vger.kernel.org
+Fixes: 63fefa050477 ("ath9k: Introduce airtime fairness scheduling between stations")
+Signed-off-by: Felix Fietkau <nbd@nbd.name>
+---
+
+--- a/drivers/net/wireless/ath/ath9k/xmit.c
++++ b/drivers/net/wireless/ath/ath9k/xmit.c
+@@ -723,51 +723,31 @@ static bool bf_is_ampdu_not_probing(stru
+ return bf_isampdu(bf) && !(info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE);
+ }
+
+-static void ath_tx_count_airtime(struct ath_softc *sc, struct ath_txq *txq,
+- struct ath_buf *bf, struct ath_tx_status *ts)
++static void ath_tx_count_airtime(struct ath_softc *sc, struct ath_node *an,
++ struct ath_atx_tid *tid, struct ath_buf *bf,
++ struct ath_tx_status *ts)
+ {
+- struct ath_node *an;
+- struct ath_acq *acq = &sc->cur_chan->acq[txq->mac80211_qnum];
+- struct sk_buff *skb;
+- struct ieee80211_hdr *hdr;
+- struct ieee80211_hw *hw = sc->hw;
+- struct ieee80211_tx_rate rates[4];
+- struct ieee80211_sta *sta;
+- int i;
++ struct ath_txq *txq = tid->txq;
+ u32 airtime = 0;
+-
+- skb = bf->bf_mpdu;
+- if(!skb)
+- return;
+-
+- hdr = (struct ieee80211_hdr *)skb->data;
+- memcpy(rates, bf->rates, sizeof(rates));
+-
+- rcu_read_lock();
+-
+- sta = ieee80211_find_sta_by_ifaddr(hw, hdr->addr1, hdr->addr2);
+- if(!sta)
+- goto exit;
+-
+-
+- an = (struct ath_node *) sta->drv_priv;
++ int i;
+
+ airtime += ts->duration * (ts->ts_longretry + 1);
++ for(i = 0; i < ts->ts_rateindex; i++) {
++ int rate_dur = ath9k_hw_get_duration(sc->sc_ah, bf->bf_desc, i);
++ airtime += rate_dur * bf->rates[i].count;
++ }
+
+- for(i=0; i < ts->ts_rateindex; i++)
+- airtime += ath9k_hw_get_duration(sc->sc_ah, bf->bf_desc, i) * rates[i].count;
++ if (sc->airtime_flags & AIRTIME_USE_TX) {
++ int q = txq->mac80211_qnum;
++ struct ath_acq *acq = &sc->cur_chan->acq[q];
+
+- if (!!(sc->airtime_flags & AIRTIME_USE_TX)) {
+ spin_lock_bh(&acq->lock);
+- an->airtime_deficit[txq->mac80211_qnum] -= airtime;
+- if (an->airtime_deficit[txq->mac80211_qnum] <= 0)
+- __ath_tx_queue_tid(sc, ath_get_skb_tid(sc, an, skb));
++ an->airtime_deficit[q] -= airtime;
++ if (an->airtime_deficit[q] <= 0)
++ __ath_tx_queue_tid(sc, tid);
+ spin_unlock_bh(&acq->lock);
+ }
+ ath_debug_airtime(sc, an, 0, airtime);
+-
+-exit:
+- rcu_read_unlock();
+ }
+
+ static void ath_tx_process_buffer(struct ath_softc *sc, struct ath_txq *txq,
+@@ -791,13 +771,13 @@ static void ath_tx_process_buffer(struct
+
+ ts->duration = ath9k_hw_get_duration(sc->sc_ah, bf->bf_desc,
+ ts->ts_rateindex);
+- ath_tx_count_airtime(sc, txq, bf, ts);
+
+ hdr = (struct ieee80211_hdr *) bf->bf_mpdu->data;
+ sta = ieee80211_find_sta_by_ifaddr(hw, hdr->addr1, hdr->addr2);
+ if (sta) {
+ struct ath_node *an = (struct ath_node *)sta->drv_priv;
+ tid = ath_get_skb_tid(sc, an, bf->bf_mpdu);
++ ath_tx_count_airtime(sc, an, tid, bf, ts);
+ if (ts->ts_status & (ATH9K_TXERR_FILT | ATH9K_TXERR_XRETRY))
+ tid->clear_ps_filter = true;
+ }