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Message-Id: <1458123478-1795-4-git-send-email-michal.kazior@tieto.com>
Date: Wed, 16 Mar 2016 11:17:58 +0100
From: Michal Kazior <michal.kazior@...to.com>
To: linux-wireless@...r.kernel.org
Cc: ath10k@...ts.infradead.org, johannes@...solutions.net,
netdev@...r.kernel.org, dave.taht@...il.com,
emmanuel.grumbach@...el.com, nbd@...nwrt.org,
Tim Shepard <shep@...m.mit.edu>,
make-wifi-fast@...ts.bufferbloat.net, codel@...ts.bufferbloat.net,
Michal Kazior <michal.kazior@...to.com>
Subject: [RFCv2 3/3] ath10k: use ieee80211_tx_schedule()
The wake_tx_queue() scheduling for non-pull-push
(or threshold based pull-push) wasn't really smart
nor fair.
Instead use the new mac80211 Tx scheduling helper
which is part of the fq-codel-in-mac80211 proof of
concept.
Signed-off-by: Michal Kazior <michal.kazior@...to.com>
---
drivers/net/wireless/ath/ath10k/core.c | 2 -
drivers/net/wireless/ath/ath10k/core.h | 3 -
drivers/net/wireless/ath/ath10k/mac.c | 100 ++++++++++++++++-----------------
3 files changed, 50 insertions(+), 55 deletions(-)
diff --git a/drivers/net/wireless/ath/ath10k/core.c b/drivers/net/wireless/ath/ath10k/core.c
index 2389c0713c13..1848e0b6206a 100644
--- a/drivers/net/wireless/ath/ath10k/core.c
+++ b/drivers/net/wireless/ath/ath10k/core.c
@@ -2049,9 +2049,7 @@ struct ath10k *ath10k_core_create(size_t priv_size, struct device *dev,
mutex_init(&ar->conf_mutex);
spin_lock_init(&ar->data_lock);
- spin_lock_init(&ar->txqs_lock);
- INIT_LIST_HEAD(&ar->txqs);
INIT_LIST_HEAD(&ar->peers);
init_waitqueue_head(&ar->peer_mapping_wq);
init_waitqueue_head(&ar->htt.empty_tx_wq);
diff --git a/drivers/net/wireless/ath/ath10k/core.h b/drivers/net/wireless/ath/ath10k/core.h
index 3f76669d44cf..1f94af046f79 100644
--- a/drivers/net/wireless/ath/ath10k/core.h
+++ b/drivers/net/wireless/ath/ath10k/core.h
@@ -801,10 +801,7 @@ struct ath10k {
/* protects shared structure data */
spinlock_t data_lock;
- /* protects: ar->txqs, artxq->list */
- spinlock_t txqs_lock;
- struct list_head txqs;
struct list_head arvifs;
struct list_head peers;
struct ath10k_peer *peer_map[ATH10K_MAX_NUM_PEER_IDS];
diff --git a/drivers/net/wireless/ath/ath10k/mac.c b/drivers/net/wireless/ath/ath10k/mac.c
index addef9179dbe..5b8becb30b62 100644
--- a/drivers/net/wireless/ath/ath10k/mac.c
+++ b/drivers/net/wireless/ath/ath10k/mac.c
@@ -3624,17 +3624,14 @@ void ath10k_mgmt_over_wmi_tx_work(struct work_struct *work)
static void ath10k_mac_txq_init(struct ieee80211_txq *txq)
{
- struct ath10k_txq *artxq = (void *)txq->drv_priv;
-
if (!txq)
return;
- INIT_LIST_HEAD(&artxq->list);
+ /* It's useful to keep this even though it doesn't do anything now */
}
static void ath10k_mac_txq_unref(struct ath10k *ar, struct ieee80211_txq *txq)
{
- struct ath10k_txq *artxq = (void *)txq->drv_priv;
struct ath10k_skb_cb *cb;
struct sk_buff *msdu;
int msdu_id;
@@ -3642,11 +3639,6 @@ static void ath10k_mac_txq_unref(struct ath10k *ar, struct ieee80211_txq *txq)
if (!txq)
return;
- spin_lock_bh(&ar->txqs_lock);
- if (!list_empty(&artxq->list))
- list_del_init(&artxq->list);
- spin_unlock_bh(&ar->txqs_lock);
-
spin_lock_bh(&ar->htt.tx_lock);
idr_for_each_entry(&ar->htt.pending_tx, msdu, msdu_id) {
cb = ATH10K_SKB_CB(msdu);
@@ -3725,7 +3717,7 @@ int ath10k_mac_tx_push_txq(struct ieee80211_hw *hw,
ath10k_htt_tx_dec_pending(htt, is_mgmt);
spin_unlock_bh(&ar->htt.tx_lock);
- return -ENOENT;
+ return 0;
}
ath10k_mac_tx_h_fill_cb(ar, vif, txq, skb);
@@ -3752,44 +3744,59 @@ int ath10k_mac_tx_push_txq(struct ieee80211_hw *hw,
return skb_len;
}
+#define MIN_TX_SLOTS 42
+
+static int ath10k_mac_tx_wake(struct ieee80211_hw *hw,
+ struct ieee80211_txq *txq,
+ int budget)
+{
+ struct ath10k *ar = hw->priv;
+ int sent = 0;
+ int ret;
+ int slots;
+
+ if (!ath10k_mac_tx_can_push(hw, txq))
+ return 0;
+
+ /* This gives more opportunity to form longer bursts when there's a lot
+ * of stations active
+ */
+ slots = ar->htt.max_num_pending_tx - ar->htt.num_pending_tx;
+ if (slots < MIN_TX_SLOTS)
+ return -1;
+
+ while (budget > 0) {
+ ret = ath10k_mac_tx_push_txq(hw, txq);
+ if (ret <= 0)
+ break;
+
+ sent++;
+ budget -= ret;
+ }
+
+ if (ret >= 0)
+ return sent;
+ else
+ return -1;
+}
+
void ath10k_mac_tx_push_pending(struct ath10k *ar)
{
struct ieee80211_hw *hw = ar->hw;
- struct ieee80211_txq *txq;
- struct ath10k_txq *artxq;
- struct ath10k_txq *last;
int ret;
- int max;
- spin_lock_bh(&ar->txqs_lock);
- rcu_read_lock();
-
- last = list_last_entry(&ar->txqs, struct ath10k_txq, list);
- while (!list_empty(&ar->txqs)) {
- artxq = list_first_entry(&ar->txqs, struct ath10k_txq, list);
- txq = container_of((void *)artxq, struct ieee80211_txq,
- drv_priv);
-
- /* Prevent aggressive sta/tid taking over tx queue */
- max = 16;
- while (max--) {
- ret = ath10k_mac_tx_push_txq(hw, txq);
- if (ret < 0)
- break;
- }
-
- list_del_init(&artxq->list);
- ath10k_htt_tx_txq_update(hw, txq);
-
- if (artxq == last || (ret < 0 && ret != -ENOENT)) {
- if (ret != -ENOENT)
- list_add_tail(&artxq->list, &ar->txqs);
- break;
- }
+ ieee80211_recalc_fq_period(hw);
+
+ ret = ieee80211_tx_schedule(hw, ath10k_mac_tx_wake);
+ switch (ret) {
+ default:
+ ath10k_warn(ar, "unexpected tx schedul retval: %d\n",
+ ret);
+ /* pass through */
+ case -EBUSY:
+ case -ENOENT:
+ break;
}
-
- rcu_read_unlock();
- spin_unlock_bh(&ar->txqs_lock);
}
/************/
@@ -4013,16 +4020,9 @@ static void ath10k_mac_op_wake_tx_queue(struct ieee80211_hw *hw,
struct ieee80211_txq *txq)
{
struct ath10k *ar = hw->priv;
- struct ath10k_txq *artxq = (void *)txq->drv_priv;
-
- if (ath10k_mac_tx_can_push(hw, txq)) {
- spin_lock_bh(&ar->txqs_lock);
- if (list_empty(&artxq->list))
- list_add_tail(&artxq->list, &ar->txqs);
- spin_unlock_bh(&ar->txqs_lock);
+ if (ath10k_mac_tx_can_push(hw, txq))
tasklet_schedule(&ar->htt.txrx_compl_task);
- }
ath10k_htt_tx_txq_update(hw, txq);
}
--
2.1.4
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