[Codel] [PATCHv3 1/5] mac80211: skip netdev queue control with software queuing
Michal Kazior
michal.kazior at tieto.com
Thu Apr 14 08:18:18 EDT 2016
Qdiscs are designed with no regard to 802.11
aggregation requirements and hand out
packet-by-packet with no guarantee they are
destined to the same tid. This does more bad than
good no matter how fairly a given qdisc may behave
on an ethernet interface.
Software queuing used per-AC netdev subqueue
congestion control whenever a global AC limit was
hit. This meant in practice a single station or
tid queue could starve others rather easily. This
could resonate with qdiscs in a bad way or could
just end up with poor aggregation performance.
Increasing the AC limit would increase induced
latency which is also bad.
Disabling qdiscs by default and performing
taildrop instead of netdev subqueue congestion
control on the other hand makes it possible for
tid queues to fill up "in the meantime" while
preventing stations starving each other.
This increases aggregation opportunities and
should allow software queuing based drivers
achieve better performance by utilizing airtime
more efficiently with big aggregates.
Signed-off-by: Michal Kazior <michal.kazior at tieto.com>
---
include/net/mac80211.h | 4 ---
net/mac80211/ieee80211_i.h | 2 +-
net/mac80211/iface.c | 18 +++++++++--
net/mac80211/main.c | 3 --
net/mac80211/sta_info.c | 2 +-
net/mac80211/tx.c | 80 ++++++++++++++++++++++++----------------------
net/mac80211/util.c | 11 ++++---
7 files changed, 65 insertions(+), 55 deletions(-)
diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index a53333cb1528..c24d0b8e4deb 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -2113,9 +2113,6 @@ enum ieee80211_hw_flags {
* @n_cipher_schemes: a size of an array of cipher schemes definitions.
* @cipher_schemes: a pointer to an array of cipher scheme definitions
* supported by HW.
- *
- * @txq_ac_max_pending: maximum number of frames per AC pending in all txq
- * entries for a vif.
*/
struct ieee80211_hw {
struct ieee80211_conf conf;
@@ -2145,7 +2142,6 @@ struct ieee80211_hw {
u8 uapsd_max_sp_len;
u8 n_cipher_schemes;
const struct ieee80211_cipher_scheme *cipher_schemes;
- int txq_ac_max_pending;
};
static inline bool _ieee80211_hw_check(struct ieee80211_hw *hw,
diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index c6830fbe7d68..b2570aa66d33 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -855,7 +855,6 @@ struct ieee80211_sub_if_data {
bool control_port_no_encrypt;
int encrypt_headroom;
- atomic_t txqs_len[IEEE80211_NUM_ACS];
struct ieee80211_tx_queue_params tx_conf[IEEE80211_NUM_ACS];
struct mac80211_qos_map __rcu *qos_map;
@@ -1118,6 +1117,7 @@ struct ieee80211_local {
fif_probe_req;
int probe_req_reg;
unsigned int filter_flags; /* FIF_* */
+ atomic_t num_tx_queued;
bool wiphy_ciphers_allocated;
diff --git a/net/mac80211/iface.c b/net/mac80211/iface.c
index 453b4e741780..67c9b1e565ad 100644
--- a/net/mac80211/iface.c
+++ b/net/mac80211/iface.c
@@ -976,13 +976,13 @@ static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
if (sdata->vif.txq) {
struct txq_info *txqi = to_txq_info(sdata->vif.txq);
+ int n = skb_queue_len(&txqi->queue);
spin_lock_bh(&txqi->queue.lock);
ieee80211_purge_tx_queue(&local->hw, &txqi->queue);
+ atomic_sub(n, &local->num_tx_queued);
txqi->byte_cnt = 0;
spin_unlock_bh(&txqi->queue.lock);
-
- atomic_set(&sdata->txqs_len[txqi->txq.ac], 0);
}
if (local->open_count == 0)
@@ -1198,6 +1198,12 @@ static void ieee80211_if_setup(struct net_device *dev)
dev->destructor = ieee80211_if_free;
}
+static void ieee80211_if_setup_no_queue(struct net_device *dev)
+{
+ ieee80211_if_setup(dev);
+ dev->priv_flags |= IFF_NO_QUEUE;
+}
+
static void ieee80211_iface_work(struct work_struct *work)
{
struct ieee80211_sub_if_data *sdata =
@@ -1707,6 +1713,7 @@ int ieee80211_if_add(struct ieee80211_local *local, const char *name,
struct net_device *ndev = NULL;
struct ieee80211_sub_if_data *sdata = NULL;
struct txq_info *txqi;
+ void (*if_setup)(struct net_device *dev);
int ret, i;
int txqs = 1;
@@ -1734,12 +1741,17 @@ int ieee80211_if_add(struct ieee80211_local *local, const char *name,
txq_size += sizeof(struct txq_info) +
local->hw.txq_data_size;
+ if (local->ops->wake_tx_queue)
+ if_setup = ieee80211_if_setup_no_queue;
+ else
+ if_setup = ieee80211_if_setup;
+
if (local->hw.queues >= IEEE80211_NUM_ACS)
txqs = IEEE80211_NUM_ACS;
ndev = alloc_netdev_mqs(size + txq_size,
name, name_assign_type,
- ieee80211_if_setup, txqs, 1);
+ if_setup, txqs, 1);
if (!ndev)
return -ENOMEM;
dev_net_set(ndev, wiphy_net(local->hw.wiphy));
diff --git a/net/mac80211/main.c b/net/mac80211/main.c
index 8190bf27ebff..609abc39e454 100644
--- a/net/mac80211/main.c
+++ b/net/mac80211/main.c
@@ -1053,9 +1053,6 @@ int ieee80211_register_hw(struct ieee80211_hw *hw)
local->dynamic_ps_forced_timeout = -1;
- if (!local->hw.txq_ac_max_pending)
- local->hw.txq_ac_max_pending = 64;
-
result = ieee80211_wep_init(local);
if (result < 0)
wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n",
diff --git a/net/mac80211/sta_info.c b/net/mac80211/sta_info.c
index 00c82fb152c0..4ab97d454bc1 100644
--- a/net/mac80211/sta_info.c
+++ b/net/mac80211/sta_info.c
@@ -115,7 +115,7 @@ static void __cleanup_single_sta(struct sta_info *sta)
int n = skb_queue_len(&txqi->queue);
ieee80211_purge_tx_queue(&local->hw, &txqi->queue);
- atomic_sub(n, &sdata->txqs_len[txqi->txq.ac]);
+ atomic_sub(n, &local->num_tx_queued);
txqi->byte_cnt = 0;
}
}
diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c
index 485e30a24b38..8de3d2676397 100644
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -1232,67 +1232,56 @@ ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
return TX_CONTINUE;
}
-static void ieee80211_drv_tx(struct ieee80211_local *local,
- struct ieee80211_vif *vif,
- struct ieee80211_sta *pubsta,
- struct sk_buff *skb)
+static struct txq_info *ieee80211_get_txq(struct ieee80211_local *local,
+ struct ieee80211_vif *vif,
+ struct ieee80211_sta *pubsta,
+ struct sk_buff *skb)
{
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
- struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
- struct ieee80211_tx_control control = {
- .sta = pubsta,
- };
- struct ieee80211_txq *txq = NULL;
- struct txq_info *txqi;
- u8 ac;
if ((info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) ||
(info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE))
- goto tx_normal;
+ return NULL;
if (!ieee80211_is_data(hdr->frame_control))
- goto tx_normal;
+ return NULL;
if (pubsta) {
u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK;
- txq = pubsta->txq[tid];
+ return to_txq_info(pubsta->txq[tid]);
} else if (vif) {
- txq = vif->txq;
+ return to_txq_info(vif->txq);
}
- if (!txq)
- goto tx_normal;
+ return NULL;
+}
- ac = txq->ac;
- txqi = to_txq_info(txq);
- atomic_inc(&sdata->txqs_len[ac]);
- if (atomic_read(&sdata->txqs_len[ac]) >= local->hw.txq_ac_max_pending)
- netif_stop_subqueue(sdata->dev, ac);
+static void ieee80211_txq_enqueue(struct ieee80211_local *local,
+ struct txq_info *txqi,
+ struct sk_buff *skb)
+{
+ lockdep_assert_held(&txqi->queue.lock);
- spin_lock_bh(&txqi->queue.lock);
+ if (atomic_read(&local->num_tx_queued) >= TOTAL_MAX_TX_BUFFER ||
+ txqi->queue.qlen >= STA_MAX_TX_BUFFER) {
+ ieee80211_free_txskb(&local->hw, skb);
+ return;
+ }
+
+ atomic_inc(&local->num_tx_queued);
txqi->byte_cnt += skb->len;
__skb_queue_tail(&txqi->queue, skb);
- spin_unlock_bh(&txqi->queue.lock);
-
- drv_wake_tx_queue(local, txqi);
-
- return;
-
-tx_normal:
- drv_tx(local, &control, skb);
}
struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw,
struct ieee80211_txq *txq)
{
struct ieee80211_local *local = hw_to_local(hw);
- struct ieee80211_sub_if_data *sdata = vif_to_sdata(txq->vif);
struct txq_info *txqi = container_of(txq, struct txq_info, txq);
struct ieee80211_hdr *hdr;
struct sk_buff *skb = NULL;
- u8 ac = txq->ac;
spin_lock_bh(&txqi->queue.lock);
@@ -1303,12 +1292,9 @@ struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw,
if (!skb)
goto out;
+ atomic_dec(&local->num_tx_queued);
txqi->byte_cnt -= skb->len;
- atomic_dec(&sdata->txqs_len[ac]);
- if (__netif_subqueue_stopped(sdata->dev, ac))
- ieee80211_propagate_queue_wake(local, sdata->vif.hw_queue[ac]);
-
hdr = (struct ieee80211_hdr *)skb->data;
if (txq->sta && ieee80211_is_data_qos(hdr->frame_control)) {
struct sta_info *sta = container_of(txq->sta, struct sta_info,
@@ -1335,7 +1321,9 @@ static bool ieee80211_tx_frags(struct ieee80211_local *local,
struct sk_buff_head *skbs,
bool txpending)
{
+ struct ieee80211_tx_control control = {};
struct sk_buff *skb, *tmp;
+ struct txq_info *txqi;
unsigned long flags;
skb_queue_walk_safe(skbs, skb, tmp) {
@@ -1350,6 +1338,21 @@ static bool ieee80211_tx_frags(struct ieee80211_local *local,
}
#endif
+ txqi = ieee80211_get_txq(local, vif, sta, skb);
+ if (txqi) {
+ info->control.vif = vif;
+
+ __skb_unlink(skb, skbs);
+
+ spin_lock_bh(&txqi->queue.lock);
+ ieee80211_txq_enqueue(local, txqi, skb);
+ spin_unlock_bh(&txqi->queue.lock);
+
+ drv_wake_tx_queue(local, txqi);
+
+ continue;
+ }
+
spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
if (local->queue_stop_reasons[q] ||
(!txpending && !skb_queue_empty(&local->pending[q]))) {
@@ -1392,9 +1395,10 @@ static bool ieee80211_tx_frags(struct ieee80211_local *local,
spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
info->control.vif = vif;
+ control.sta = sta;
__skb_unlink(skb, skbs);
- ieee80211_drv_tx(local, vif, sta, skb);
+ drv_tx(local, &control, skb);
}
return true;
diff --git a/net/mac80211/util.c b/net/mac80211/util.c
index 0319d6d4f863..f13b08896238 100644
--- a/net/mac80211/util.c
+++ b/net/mac80211/util.c
@@ -244,6 +244,9 @@ void ieee80211_propagate_queue_wake(struct ieee80211_local *local, int queue)
struct ieee80211_sub_if_data *sdata;
int n_acs = IEEE80211_NUM_ACS;
+ if (local->ops->wake_tx_queue)
+ return;
+
if (local->hw.queues < IEEE80211_NUM_ACS)
n_acs = 1;
@@ -260,11 +263,6 @@ void ieee80211_propagate_queue_wake(struct ieee80211_local *local, int queue)
for (ac = 0; ac < n_acs; ac++) {
int ac_queue = sdata->vif.hw_queue[ac];
- if (local->ops->wake_tx_queue &&
- (atomic_read(&sdata->txqs_len[ac]) >
- local->hw.txq_ac_max_pending))
- continue;
-
if (ac_queue == queue ||
(sdata->vif.cab_queue == queue &&
local->queue_stop_reasons[ac_queue] == 0 &&
@@ -341,6 +339,9 @@ static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue,
trace_stop_queue(local, queue, reason);
+ if (local->ops->wake_tx_queue)
+ return;
+
if (WARN_ON(queue >= hw->queues))
return;
--
2.1.4
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