This is a note to let you know that I've just added the patch titled
wifi: mt76: fix race condition related to checking tx queue fill status
to the 6.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
wifi-mt76-fix-race-condition-related-to-checking-tx-.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit c30775cc482b20f7720499215b40d853f7617049
Author: Felix Fietkau <nbd@xxxxxxxx>
Date: Tue Aug 29 10:39:53 2023 +0200
wifi: mt76: fix race condition related to checking tx queue fill status
[ Upstream commit 0335c034e7265d36d956e806f33202c94a8a9860 ]
When drv_tx calls race against local tx scheduling, the queue fill status checks
can potentially race, leading to dma queue entries being overwritten.
Fix this by deferring packets from drv_tx calls to the tx worker, in order to
ensure that all regular queue tx comes from the same context.
Reported-by: Ryder Lee <Ryder.Lee@xxxxxxxxxxxx>
Signed-off-by: Felix Fietkau <nbd@xxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/net/wireless/mediatek/mt76/mac80211.c b/drivers/net/wireless/mediatek/mt76/mac80211.c
index dbab400969202..85bffcf4f6fbf 100644
--- a/drivers/net/wireless/mediatek/mt76/mac80211.c
+++ b/drivers/net/wireless/mediatek/mt76/mac80211.c
@@ -415,6 +415,9 @@ mt76_phy_init(struct mt76_phy *phy, struct ieee80211_hw *hw)
struct mt76_dev *dev = phy->dev;
struct wiphy *wiphy = hw->wiphy;
+ INIT_LIST_HEAD(&phy->tx_list);
+ spin_lock_init(&phy->tx_lock);
+
SET_IEEE80211_DEV(hw, dev->dev);
SET_IEEE80211_PERM_ADDR(hw, phy->macaddr);
@@ -688,6 +691,7 @@ int mt76_register_device(struct mt76_dev *dev, bool vht,
int ret;
dev_set_drvdata(dev->dev, dev);
+ mt76_wcid_init(&dev->global_wcid);
ret = mt76_phy_init(phy, hw);
if (ret)
return ret;
@@ -743,6 +747,7 @@ void mt76_unregister_device(struct mt76_dev *dev)
if (IS_ENABLED(CONFIG_MT76_LEDS))
mt76_led_cleanup(&dev->phy);
mt76_tx_status_check(dev, true);
+ mt76_wcid_cleanup(dev, &dev->global_wcid);
ieee80211_unregister_hw(hw);
}
EXPORT_SYMBOL_GPL(mt76_unregister_device);
@@ -1411,7 +1416,7 @@ mt76_sta_add(struct mt76_phy *phy, struct ieee80211_vif *vif,
wcid->phy_idx = phy->band_idx;
rcu_assign_pointer(dev->wcid[wcid->idx], wcid);
- mt76_packet_id_init(wcid);
+ mt76_wcid_init(wcid);
out:
mutex_unlock(&dev->mutex);
@@ -1430,7 +1435,7 @@ void __mt76_sta_remove(struct mt76_dev *dev, struct ieee80211_vif *vif,
if (dev->drv->sta_remove)
dev->drv->sta_remove(dev, vif, sta);
- mt76_packet_id_flush(dev, wcid);
+ mt76_wcid_cleanup(dev, wcid);
mt76_wcid_mask_clear(dev->wcid_mask, idx);
mt76_wcid_mask_clear(dev->wcid_phy_mask, idx);
@@ -1486,6 +1491,47 @@ void mt76_sta_pre_rcu_remove(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
}
EXPORT_SYMBOL_GPL(mt76_sta_pre_rcu_remove);
+void mt76_wcid_init(struct mt76_wcid *wcid)
+{
+ INIT_LIST_HEAD(&wcid->tx_list);
+ skb_queue_head_init(&wcid->tx_pending);
+
+ INIT_LIST_HEAD(&wcid->list);
+ idr_init(&wcid->pktid);
+}
+EXPORT_SYMBOL_GPL(mt76_wcid_init);
+
+void mt76_wcid_cleanup(struct mt76_dev *dev, struct mt76_wcid *wcid)
+{
+ struct mt76_phy *phy = dev->phys[wcid->phy_idx];
+ struct ieee80211_hw *hw;
+ struct sk_buff_head list;
+ struct sk_buff *skb;
+
+ mt76_tx_status_lock(dev, &list);
+ mt76_tx_status_skb_get(dev, wcid, -1, &list);
+ mt76_tx_status_unlock(dev, &list);
+
+ idr_destroy(&wcid->pktid);
+
+ spin_lock_bh(&phy->tx_lock);
+
+ if (!list_empty(&wcid->tx_list))
+ list_del_init(&wcid->tx_list);
+
+ spin_lock(&wcid->tx_pending.lock);
+ skb_queue_splice_tail_init(&wcid->tx_pending, &list);
+ spin_unlock(&wcid->tx_pending.lock);
+
+ spin_unlock_bh(&phy->tx_lock);
+
+ while ((skb = __skb_dequeue(&list)) != NULL) {
+ hw = mt76_tx_status_get_hw(dev, skb);
+ ieee80211_free_txskb(hw, skb);
+ }
+}
+EXPORT_SYMBOL_GPL(mt76_wcid_cleanup);
+
int mt76_get_txpower(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
int *dbm)
{
diff --git a/drivers/net/wireless/mediatek/mt76/mt76.h b/drivers/net/wireless/mediatek/mt76/mt76.h
index 7f44736ca26f0..8b620d4fed439 100644
--- a/drivers/net/wireless/mediatek/mt76/mt76.h
+++ b/drivers/net/wireless/mediatek/mt76/mt76.h
@@ -334,6 +334,9 @@ struct mt76_wcid {
u32 tx_info;
bool sw_iv;
+ struct list_head tx_list;
+ struct sk_buff_head tx_pending;
+
struct list_head list;
struct idr pktid;
@@ -719,6 +722,8 @@ struct mt76_phy {
unsigned long state;
u8 band_idx;
+ spinlock_t tx_lock;
+ struct list_head tx_list;
struct mt76_queue *q_tx[__MT_TXQ_MAX];
struct cfg80211_chan_def chandef;
@@ -1599,22 +1604,7 @@ mt76_token_put(struct mt76_dev *dev, int token)
return txwi;
}
-static inline void mt76_packet_id_init(struct mt76_wcid *wcid)
-{
- INIT_LIST_HEAD(&wcid->list);
- idr_init(&wcid->pktid);
-}
-
-static inline void
-mt76_packet_id_flush(struct mt76_dev *dev, struct mt76_wcid *wcid)
-{
- struct sk_buff_head list;
-
- mt76_tx_status_lock(dev, &list);
- mt76_tx_status_skb_get(dev, wcid, -1, &list);
- mt76_tx_status_unlock(dev, &list);
-
- idr_destroy(&wcid->pktid);
-}
+void mt76_wcid_init(struct mt76_wcid *wcid);
+void mt76_wcid_cleanup(struct mt76_dev *dev, struct mt76_wcid *wcid);
#endif
diff --git a/drivers/net/wireless/mediatek/mt76/mt7603/main.c b/drivers/net/wireless/mediatek/mt76/mt7603/main.c
index c213fd2a5216b..89d738deea62e 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7603/main.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7603/main.c
@@ -70,7 +70,7 @@ mt7603_add_interface(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
mvif->sta.wcid.idx = idx;
mvif->sta.wcid.hw_key_idx = -1;
mvif->sta.vif = mvif;
- mt76_packet_id_init(&mvif->sta.wcid);
+ mt76_wcid_init(&mvif->sta.wcid);
eth_broadcast_addr(bc_addr);
mt7603_wtbl_init(dev, idx, mvif->idx, bc_addr);
@@ -110,7 +110,7 @@ mt7603_remove_interface(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
dev->mt76.vif_mask &= ~BIT_ULL(mvif->idx);
mutex_unlock(&dev->mt76.mutex);
- mt76_packet_id_flush(&dev->mt76, &mvif->sta.wcid);
+ mt76_wcid_cleanup(&dev->mt76, &mvif->sta.wcid);
}
void mt7603_init_edcca(struct mt7603_dev *dev)
diff --git a/drivers/net/wireless/mediatek/mt76/mt7615/main.c b/drivers/net/wireless/mediatek/mt76/mt7615/main.c
index 200b1752ca77f..dab16b5fc3861 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7615/main.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7615/main.c
@@ -226,7 +226,7 @@ static int mt7615_add_interface(struct ieee80211_hw *hw,
mvif->sta.wcid.idx = idx;
mvif->sta.wcid.phy_idx = mvif->mt76.band_idx;
mvif->sta.wcid.hw_key_idx = -1;
- mt76_packet_id_init(&mvif->sta.wcid);
+ mt76_wcid_init(&mvif->sta.wcid);
mt7615_mac_wtbl_update(dev, idx,
MT_WTBL_UPDATE_ADM_COUNT_CLEAR);
@@ -279,7 +279,7 @@ static void mt7615_remove_interface(struct ieee80211_hw *hw,
list_del_init(&msta->wcid.poll_list);
spin_unlock_bh(&dev->mt76.sta_poll_lock);
- mt76_packet_id_flush(&dev->mt76, &mvif->sta.wcid);
+ mt76_wcid_cleanup(&dev->mt76, &mvif->sta.wcid);
}
int mt7615_set_channel(struct mt7615_phy *phy)
diff --git a/drivers/net/wireless/mediatek/mt76/mt76x02_util.c b/drivers/net/wireless/mediatek/mt76/mt76x02_util.c
index dcbb5c605dfe6..8a0e8124b8940 100644
--- a/drivers/net/wireless/mediatek/mt76/mt76x02_util.c
+++ b/drivers/net/wireless/mediatek/mt76/mt76x02_util.c
@@ -288,7 +288,7 @@ mt76x02_vif_init(struct mt76x02_dev *dev, struct ieee80211_vif *vif,
mvif->idx = idx;
mvif->group_wcid.idx = MT_VIF_WCID(idx);
mvif->group_wcid.hw_key_idx = -1;
- mt76_packet_id_init(&mvif->group_wcid);
+ mt76_wcid_init(&mvif->group_wcid);
mtxq = (struct mt76_txq *)vif->txq->drv_priv;
rcu_assign_pointer(dev->mt76.wcid[MT_VIF_WCID(idx)], &mvif->group_wcid);
@@ -346,7 +346,7 @@ void mt76x02_remove_interface(struct ieee80211_hw *hw,
dev->mt76.vif_mask &= ~BIT_ULL(mvif->idx);
rcu_assign_pointer(dev->mt76.wcid[mvif->group_wcid.idx], NULL);
- mt76_packet_id_flush(&dev->mt76, &mvif->group_wcid);
+ mt76_wcid_cleanup(&dev->mt76, &mvif->group_wcid);
}
EXPORT_SYMBOL_GPL(mt76x02_remove_interface);
diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/main.c b/drivers/net/wireless/mediatek/mt76/mt7915/main.c
index 3196f56cdf4ab..260fe00d7dc6d 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7915/main.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7915/main.c
@@ -253,7 +253,7 @@ static int mt7915_add_interface(struct ieee80211_hw *hw,
mvif->sta.wcid.phy_idx = ext_phy;
mvif->sta.wcid.hw_key_idx = -1;
mvif->sta.wcid.tx_info |= MT_WCID_TX_INFO_SET;
- mt76_packet_id_init(&mvif->sta.wcid);
+ mt76_wcid_init(&mvif->sta.wcid);
mt7915_mac_wtbl_update(dev, idx,
MT_WTBL_UPDATE_ADM_COUNT_CLEAR);
@@ -314,7 +314,7 @@ static void mt7915_remove_interface(struct ieee80211_hw *hw,
list_del_init(&msta->wcid.poll_list);
spin_unlock_bh(&dev->mt76.sta_poll_lock);
- mt76_packet_id_flush(&dev->mt76, &msta->wcid);
+ mt76_wcid_cleanup(&dev->mt76, &msta->wcid);
}
int mt7915_set_channel(struct mt7915_phy *phy)
diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/main.c b/drivers/net/wireless/mediatek/mt76/mt7921/main.c
index d8851cb5f400b..6a5c2cae087d0 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7921/main.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/main.c
@@ -318,7 +318,7 @@ mt7921_add_interface(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
mvif->sta.wcid.phy_idx = mvif->mt76.band_idx;
mvif->sta.wcid.hw_key_idx = -1;
mvif->sta.wcid.tx_info |= MT_WCID_TX_INFO_SET;
- mt76_packet_id_init(&mvif->sta.wcid);
+ mt76_wcid_init(&mvif->sta.wcid);
mt7921_mac_wtbl_update(dev, idx,
MT_WTBL_UPDATE_ADM_COUNT_CLEAR);
diff --git a/drivers/net/wireless/mediatek/mt76/mt792x_core.c b/drivers/net/wireless/mediatek/mt76/mt792x_core.c
index 2fb1141e5fa96..66806ed4f942d 100644
--- a/drivers/net/wireless/mediatek/mt76/mt792x_core.c
+++ b/drivers/net/wireless/mediatek/mt76/mt792x_core.c
@@ -115,7 +115,7 @@ void mt792x_remove_interface(struct ieee80211_hw *hw,
list_del_init(&msta->wcid.poll_list);
spin_unlock_bh(&dev->mt76.sta_poll_lock);
- mt76_packet_id_flush(&dev->mt76, &msta->wcid);
+ mt76_wcid_cleanup(&dev->mt76, &msta->wcid);
}
EXPORT_SYMBOL_GPL(mt792x_remove_interface);
diff --git a/drivers/net/wireless/mediatek/mt76/mt7996/main.c b/drivers/net/wireless/mediatek/mt76/mt7996/main.c
index 620880e560e00..7fea9f0d409bf 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7996/main.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7996/main.c
@@ -207,7 +207,7 @@ static int mt7996_add_interface(struct ieee80211_hw *hw,
mvif->sta.wcid.phy_idx = band_idx;
mvif->sta.wcid.hw_key_idx = -1;
mvif->sta.wcid.tx_info |= MT_WCID_TX_INFO_SET;
- mt76_packet_id_init(&mvif->sta.wcid);
+ mt76_wcid_init(&mvif->sta.wcid);
mt7996_mac_wtbl_update(dev, idx,
MT_WTBL_UPDATE_ADM_COUNT_CLEAR);
@@ -268,7 +268,7 @@ static void mt7996_remove_interface(struct ieee80211_hw *hw,
list_del_init(&msta->wcid.poll_list);
spin_unlock_bh(&dev->mt76.sta_poll_lock);
- mt76_packet_id_flush(&dev->mt76, &msta->wcid);
+ mt76_wcid_cleanup(&dev->mt76, &msta->wcid);
}
int mt7996_set_channel(struct mt7996_phy *phy)
diff --git a/drivers/net/wireless/mediatek/mt76/tx.c b/drivers/net/wireless/mediatek/mt76/tx.c
index 6cc26cc6c5178..1809b03292c3d 100644
--- a/drivers/net/wireless/mediatek/mt76/tx.c
+++ b/drivers/net/wireless/mediatek/mt76/tx.c
@@ -329,40 +329,32 @@ void
mt76_tx(struct mt76_phy *phy, struct ieee80211_sta *sta,
struct mt76_wcid *wcid, struct sk_buff *skb)
{
- struct mt76_dev *dev = phy->dev;
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
- struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
- struct mt76_queue *q;
- int qid = skb_get_queue_mapping(skb);
if (mt76_testmode_enabled(phy)) {
ieee80211_free_txskb(phy->hw, skb);
return;
}
- if (WARN_ON(qid >= MT_TXQ_PSD)) {
- qid = MT_TXQ_BE;
- skb_set_queue_mapping(skb, qid);
- }
-
- if ((dev->drv->drv_flags & MT_DRV_HW_MGMT_TXQ) &&
- !(info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) &&
- !ieee80211_is_data(hdr->frame_control) &&
- !ieee80211_is_bufferable_mmpdu(skb)) {
- qid = MT_TXQ_PSD;
- }
+ if (WARN_ON(skb_get_queue_mapping(skb) >= MT_TXQ_PSD))
+ skb_set_queue_mapping(skb, MT_TXQ_BE);
if (wcid && !(wcid->tx_info & MT_WCID_TX_INFO_SET))
ieee80211_get_tx_rates(info->control.vif, sta, skb,
info->control.rates, 1);
info->hw_queue |= FIELD_PREP(MT_TX_HW_QUEUE_PHY, phy->band_idx);
- q = phy->q_tx[qid];
- spin_lock_bh(&q->lock);
- __mt76_tx_queue_skb(phy, qid, skb, wcid, sta, NULL);
- dev->queue_ops->kick(dev, q);
- spin_unlock_bh(&q->lock);
+ spin_lock_bh(&wcid->tx_pending.lock);
+ __skb_queue_tail(&wcid->tx_pending, skb);
+ spin_unlock_bh(&wcid->tx_pending.lock);
+
+ spin_lock_bh(&phy->tx_lock);
+ if (list_empty(&wcid->tx_list))
+ list_add_tail(&wcid->tx_list, &phy->tx_list);
+ spin_unlock_bh(&phy->tx_lock);
+
+ mt76_worker_schedule(&phy->dev->tx_worker);
}
EXPORT_SYMBOL_GPL(mt76_tx);
@@ -593,10 +585,86 @@ void mt76_txq_schedule(struct mt76_phy *phy, enum mt76_txq_id qid)
}
EXPORT_SYMBOL_GPL(mt76_txq_schedule);
+static int
+mt76_txq_schedule_pending_wcid(struct mt76_phy *phy, struct mt76_wcid *wcid)
+{
+ struct mt76_dev *dev = phy->dev;
+ struct ieee80211_sta *sta;
+ struct mt76_queue *q;
+ struct sk_buff *skb;
+ int ret = 0;
+
+ spin_lock(&wcid->tx_pending.lock);
+ while ((skb = skb_peek(&wcid->tx_pending)) != NULL) {
+ struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
+ struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
+ int qid = skb_get_queue_mapping(skb);
+
+ if ((dev->drv->drv_flags & MT_DRV_HW_MGMT_TXQ) &&
+ !(info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) &&
+ !ieee80211_is_data(hdr->frame_control) &&
+ !ieee80211_is_bufferable_mmpdu(skb))
+ qid = MT_TXQ_PSD;
+
+ q = phy->q_tx[qid];
+ if (mt76_txq_stopped(q)) {
+ ret = -1;
+ break;
+ }
+
+ __skb_unlink(skb, &wcid->tx_pending);
+ spin_unlock(&wcid->tx_pending.lock);
+
+ sta = wcid_to_sta(wcid);
+ spin_lock(&q->lock);
+ __mt76_tx_queue_skb(phy, qid, skb, wcid, sta, NULL);
+ dev->queue_ops->kick(dev, q);
+ spin_unlock(&q->lock);
+
+ spin_lock(&wcid->tx_pending.lock);
+ }
+ spin_unlock(&wcid->tx_pending.lock);
+
+ return ret;
+}
+
+static void mt76_txq_schedule_pending(struct mt76_phy *phy)
+{
+ if (list_empty(&phy->tx_list))
+ return;
+
+ local_bh_disable();
+ rcu_read_lock();
+
+ spin_lock(&phy->tx_lock);
+ while (!list_empty(&phy->tx_list)) {
+ struct mt76_wcid *wcid = NULL;
+ int ret;
+
+ wcid = list_first_entry(&phy->tx_list, struct mt76_wcid, tx_list);
+ list_del_init(&wcid->tx_list);
+
+ spin_unlock(&phy->tx_lock);
+ ret = mt76_txq_schedule_pending_wcid(phy, wcid);
+ spin_lock(&phy->tx_lock);
+
+ if (ret) {
+ if (list_empty(&wcid->tx_list))
+ list_add_tail(&wcid->tx_list, &phy->tx_list);
+ break;
+ }
+ }
+ spin_unlock(&phy->tx_lock);
+
+ rcu_read_unlock();
+ local_bh_enable();
+}
+
void mt76_txq_schedule_all(struct mt76_phy *phy)
{
int i;
+ mt76_txq_schedule_pending(phy);
for (i = 0; i <= MT_TXQ_BK; i++)
mt76_txq_schedule(phy, i);
}
