When a running wake_tx_queue() call is aborted due to a hw queue stop
the corresponding iTXQ is not always correctly marked for resumption:
wake_tx_push_queue() can stops the queue run without setting
@IEEE80211_TXQ_STOP_NETIF_TX.
Without the @IEEE80211_TXQ_STOP_NETIF_TX flag __ieee80211_wake_txqs()
will not schedule a new queue run and remaining frames in the queue get
stuck till another frame is queued to it.
Fix the issue for all drivers - also the ones with custom wake_tx_queue
callbacks - by moving the logic into ieee80211_tx_dequeue() and drop the
redundant @txqs_stopped.
@IEEE80211_TXQ_STOP_NETIF_TX is also renamed to @IEEE80211_TXQ_DIRTY to
better describe the flag.
Fixes: c850e31f79f0 ("wifi: mac80211: add internal handler for wake_tx_queue")
Signed-off-by: Alexander Wetzel <alexander@xxxxxxxxxxxxxx>
---
include/net/mac80211.h | 4 ----
net/mac80211/debugfs_sta.c | 5 +++--
net/mac80211/driver-ops.h | 2 +-
net/mac80211/ieee80211_i.h | 2 +-
net/mac80211/tx.c | 20 +++++++++++-------
net/mac80211/util.c | 42 +++-----------------------------------
6 files changed, 21 insertions(+), 54 deletions(-)
diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index 689da327ce2e..e3235b9c02c2 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -1832,8 +1832,6 @@ struct ieee80211_vif_cfg {
* @drv_priv: data area for driver use, will always be aligned to
* sizeof(void \*).
* @txq: the multicast data TX queue
- * @txqs_stopped: per AC flag to indicate that intermediate TXQs are stopped,
- * protected by fq->lock.
* @offload_flags: 802.3 -> 802.11 enapsulation offload flags, see
* &enum ieee80211_offload_flags.
* @mbssid_tx_vif: Pointer to the transmitting interface if MBSSID is enabled.
@@ -1863,8 +1861,6 @@ struct ieee80211_vif {
bool probe_req_reg;
bool rx_mcast_action_reg;
- bool txqs_stopped[IEEE80211_NUM_ACS];
-
struct ieee80211_vif *mbssid_tx_vif;
/* must be last */
diff --git a/net/mac80211/debugfs_sta.c b/net/mac80211/debugfs_sta.c
index 7a3d7893e19d..f1914bf39f0e 100644
--- a/net/mac80211/debugfs_sta.c
+++ b/net/mac80211/debugfs_sta.c
@@ -167,7 +167,7 @@ static ssize_t sta_aqm_read(struct file *file, char __user *userbuf,
continue;
txqi = to_txq_info(sta->sta.txq[i]);
p += scnprintf(p, bufsz + buf - p,
- "%d %d %u %u %u %u %u %u %u %u %u 0x%lx(%s%s%s)\n",
+ "%d %d %u %u %u %u %u %u %u %u %u 0x%lx(%s%s%s%s)\n",
txqi->txq.tid,
txqi->txq.ac,
txqi->tin.backlog_bytes,
@@ -182,7 +182,8 @@ static ssize_t sta_aqm_read(struct file *file, char __user *userbuf,
txqi->flags,
test_bit(IEEE80211_TXQ_STOP, &txqi->flags) ? "STOP" : "RUN",
test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags) ? " AMPDU" : "",
- test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags) ? " NO-AMSDU" : "");
+ test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags) ? " NO-AMSDU" : "",
+ test_bit(IEEE80211_TXQ_DIRTY, &txqi->flags) ? " DIRTY" : "");
}
rcu_read_unlock();
diff --git a/net/mac80211/driver-ops.h b/net/mac80211/driver-ops.h
index 809bad53e15b..5d13a3dfd366 100644
--- a/net/mac80211/driver-ops.h
+++ b/net/mac80211/driver-ops.h
@@ -1199,7 +1199,7 @@ static inline void drv_wake_tx_queue(struct ieee80211_local *local,
/* In reconfig don't transmit now, but mark for waking later */
if (local->in_reconfig) {
- set_bit(IEEE80211_TXQ_STOP_NETIF_TX, &txq->flags);
+ set_bit(IEEE80211_TXQ_DIRTY, &txq->flags);
return;
}
diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index 63ff0d2524b6..d16606e84e22 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -838,7 +838,7 @@ enum txq_info_flags {
IEEE80211_TXQ_STOP,
IEEE80211_TXQ_AMPDU,
IEEE80211_TXQ_NO_AMSDU,
- IEEE80211_TXQ_STOP_NETIF_TX,
+ IEEE80211_TXQ_DIRTY,
};
/**
diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c
index 2171cd1ca807..178043f84489 100644
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -3783,6 +3783,8 @@ struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw,
struct ieee80211_tx_data tx;
ieee80211_tx_result r;
struct ieee80211_vif *vif = txq->vif;
+ int q = vif->hw_queue[txq->ac];
+ bool q_stopped;
WARN_ON_ONCE(softirq_count() == 0);
@@ -3790,16 +3792,20 @@ struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw,
return NULL;
begin:
- spin_lock_bh(&fq->lock);
+ spin_lock(&local->queue_stop_reason_lock);
+ q_stopped = local->queue_stop_reasons[q];
+ spin_unlock(&local->queue_stop_reason_lock);
- if (test_bit(IEEE80211_TXQ_STOP, &txqi->flags) ||
- test_bit(IEEE80211_TXQ_STOP_NETIF_TX, &txqi->flags))
- goto out;
+ if (unlikely(q_stopped)) {
+ /* mark for waking later */
+ set_bit(IEEE80211_TXQ_DIRTY, &txqi->flags);
+ return NULL;
+ }
- if (vif->txqs_stopped[txq->ac]) {
- set_bit(IEEE80211_TXQ_STOP_NETIF_TX, &txqi->flags);
+ spin_lock_bh(&fq->lock);
+
+ if (unlikely(test_bit(IEEE80211_TXQ_STOP, &txqi->flags)))
goto out;
- }
/* Make sure fragments stay together. */
skb = __skb_dequeue(&txqi->frags);
diff --git a/net/mac80211/util.c b/net/mac80211/util.c
index 6f5407038459..261ac667887f 100644
--- a/net/mac80211/util.c
+++ b/net/mac80211/util.c
@@ -292,22 +292,12 @@ static void wake_tx_push_queue(struct ieee80211_local *local,
struct ieee80211_sub_if_data *sdata,
struct ieee80211_txq *queue)
{
- int q = sdata->vif.hw_queue[queue->ac];
struct ieee80211_tx_control control = {
.sta = queue->sta,
};
struct sk_buff *skb;
- unsigned long flags;
- bool q_stopped;
while (1) {
- spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
- q_stopped = local->queue_stop_reasons[q];
- spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
-
- if (q_stopped)
- break;
-
skb = ieee80211_tx_dequeue(&local->hw, queue);
if (!skb)
break;
@@ -347,8 +337,6 @@ static void __ieee80211_wake_txqs(struct ieee80211_sub_if_data *sdata, int ac)
local_bh_disable();
spin_lock(&fq->lock);
- sdata->vif.txqs_stopped[ac] = false;
-
if (!test_bit(SDATA_STATE_RUNNING, &sdata->state))
goto out;
@@ -370,7 +358,7 @@ static void __ieee80211_wake_txqs(struct ieee80211_sub_if_data *sdata, int ac)
if (ac != txq->ac)
continue;
- if (!test_and_clear_bit(IEEE80211_TXQ_STOP_NETIF_TX,
+ if (!test_and_clear_bit(IEEE80211_TXQ_DIRTY,
&txqi->flags))
continue;
@@ -385,7 +373,7 @@ static void __ieee80211_wake_txqs(struct ieee80211_sub_if_data *sdata, int ac)
txqi = to_txq_info(vif->txq);
- if (!test_and_clear_bit(IEEE80211_TXQ_STOP_NETIF_TX, &txqi->flags) ||
+ if (!test_and_clear_bit(IEEE80211_TXQ_DIRTY, &txqi->flags) ||
(ps && atomic_read(&ps->num_sta_ps)) || ac != vif->txq->ac)
goto out;
@@ -517,8 +505,6 @@ static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue,
bool refcounted)
{
struct ieee80211_local *local = hw_to_local(hw);
- struct ieee80211_sub_if_data *sdata;
- int n_acs = IEEE80211_NUM_ACS;
trace_stop_queue(local, queue, reason);
@@ -530,29 +516,7 @@ static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue,
else
local->q_stop_reasons[queue][reason]++;
- if (__test_and_set_bit(reason, &local->queue_stop_reasons[queue]))
- return;
-
- if (local->hw.queues < IEEE80211_NUM_ACS)
- n_acs = 1;
-
- rcu_read_lock();
- list_for_each_entry_rcu(sdata, &local->interfaces, list) {
- int ac;
-
- if (!sdata->dev)
- continue;
-
- for (ac = 0; ac < n_acs; ac++) {
- if (sdata->vif.hw_queue[ac] == queue ||
- sdata->vif.cab_queue == queue) {
- spin_lock(&local->fq.lock);
- sdata->vif.txqs_stopped[ac] = true;
- spin_unlock(&local->fq.lock);
- }
- }
- }
- rcu_read_unlock();
+ set_bit(reason, &local->queue_stop_reasons[queue]);
}
void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
--
2.39.0
