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mac80211: backport tx queue start/stop fix

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Among other things, it fixes a race condition on calling ieee80211_restart_hw

Signed-off-by: Felix Fietkau <nbd@nbd.name>
This commit is contained in:
Felix Fietkau 2019-03-01 13:10:53 +01:00
parent 0e8ddc953f
commit 82d306b595
6 changed files with 287 additions and 15 deletions
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272
package/kernel/mac80211/patches/subsys/300-mac80211-add-stop-start-logic-for-software-TXQs.patch Normal file
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@ -0,0 +1,272 @@
From: Manikanta Pubbisetty <mpubbise@codeaurora.org>
Date: Wed, 11 Jul 2018 00:12:53 +0530
Subject: [PATCH] mac80211: add stop/start logic for software TXQs
Sometimes, it is required to stop the transmissions momentarily and
resume it later; stopping the txqs becomes very critical in scenarios where
the packet transmission has to be ceased completely. For example, during
the hardware restart, during off channel operations,
when initiating CSA(upon detecting a radar on the DFS channel), etc.
The TX queue stop/start logic in mac80211 works well in stopping the TX
when drivers make use of netdev queues, i.e, when Qdiscs in network layer
take care of traffic scheduling. Since the devices implementing
wake_tx_queue can run without Qdiscs, packets will be handed to mac80211
directly without queueing them in the netdev queues.
Also, mac80211 does not invoke any of the
netif_stop_*/netif_wake_* APIs if wake_tx_queue is implemented.
Since the queues are not stopped in this case, transmissions can continue
and this will impact negatively on the operation of the wireless device.
For example,
During hardware restart, we stop the netdev queues so that packets are
not sent to the driver. Since ath10k implements wake_tx_queue,
TX queues will not be stopped and packets might reach the hardware while
it is restarting; this can make hardware unresponsive and the only
possible option for recovery is to reboot the entire system.
There is another problem to this, it is observed that the packets
were sent on the DFS channel for a prolonged duration after radar
detection impacting the channel closing time.
We can still invoke netif stop/wake APIs when wake_tx_queue is implemented
but this could lead to packet drops in network layer; adding stop/start
logic for software TXQs in mac80211 instead makes more sense; the change
proposed adds the same in mac80211.
Signed-off-by: Manikanta Pubbisetty <mpubbise@codeaurora.org>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
---
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -1504,6 +1504,8 @@ enum ieee80211_vif_flags {
* @drv_priv: data area for driver use, will always be aligned to
* sizeof(void \*).
* @txq: the multicast data TX queue (if driver uses the TXQ abstraction)
+ * @txqs_stopped: per AC flag to indicate that intermediate TXQs are stopped,
+ * protected by fq->lock.
*/
struct ieee80211_vif {
enum nl80211_iftype type;
@@ -1528,6 +1530,8 @@ struct ieee80211_vif {
unsigned int probe_req_reg;
+ bool txqs_stopped[IEEE80211_NUM_ACS];
+
/* must be last */
u8 drv_priv[0] __aligned(sizeof(void *));
};
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -818,6 +818,7 @@ enum txq_info_flags {
IEEE80211_TXQ_STOP,
IEEE80211_TXQ_AMPDU,
IEEE80211_TXQ_NO_AMSDU,
+ IEEE80211_TXQ_STOP_NETIF_TX,
};
/**
@@ -1226,6 +1227,7 @@ struct ieee80211_local {
struct sk_buff_head pending[IEEE80211_MAX_QUEUES];
struct tasklet_struct tx_pending_tasklet;
+ struct tasklet_struct wake_txqs_tasklet;
atomic_t agg_queue_stop[IEEE80211_MAX_QUEUES];
@@ -2039,6 +2041,7 @@ void ieee80211_txq_remove_vlan(struct ie
struct ieee80211_sub_if_data *sdata);
void ieee80211_fill_txq_stats(struct cfg80211_txq_stats *txqstats,
struct txq_info *txqi);
+void ieee80211_wake_txqs(unsigned long data);
void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
u16 transaction, u16 auth_alg, u16 status,
const u8 *extra, size_t extra_len, const u8 *bssid,
--- a/net/mac80211/main.c
+++ b/net/mac80211/main.c
@@ -686,6 +686,10 @@ struct ieee80211_hw *ieee80211_alloc_hw_
tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
(unsigned long)local);
+ if (ops->wake_tx_queue)
+ tasklet_init(&local->wake_txqs_tasklet, ieee80211_wake_txqs,
+ (unsigned long)local);
+
tasklet_init(&local->tasklet,
ieee80211_tasklet_handler,
(unsigned long) local);
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -3482,13 +3482,19 @@ struct sk_buff *ieee80211_tx_dequeue(str
struct ieee80211_tx_info *info;
struct ieee80211_tx_data tx;
ieee80211_tx_result r;
- struct ieee80211_vif *vif;
+ struct ieee80211_vif *vif = txq->vif;
spin_lock_bh(&fq->lock);
- if (test_bit(IEEE80211_TXQ_STOP, &txqi->flags))
+ if (test_bit(IEEE80211_TXQ_STOP, &txqi->flags) ||
+ test_bit(IEEE80211_TXQ_STOP_NETIF_TX, &txqi->flags))
goto out;
+ if (vif->txqs_stopped[ieee80211_ac_from_tid(txq->tid)]) {
+ set_bit(IEEE80211_TXQ_STOP_NETIF_TX, &txqi->flags);
+ goto out;
+ }
+
/* Make sure fragments stay together. */
skb = __skb_dequeue(&txqi->frags);
if (skb)
@@ -3583,6 +3589,7 @@ begin:
}
IEEE80211_SKB_CB(skb)->control.vif = vif;
+
out:
spin_unlock_bh(&fq->lock);
--- a/net/mac80211/util.c
+++ b/net/mac80211/util.c
@@ -240,6 +240,99 @@ __le16 ieee80211_ctstoself_duration(stru
}
EXPORT_SYMBOL(ieee80211_ctstoself_duration);
+static void __ieee80211_wake_txqs(struct ieee80211_sub_if_data *sdata, int ac)
+{
+ struct ieee80211_local *local = sdata->local;
+ struct ieee80211_vif *vif = &sdata->vif;
+ struct fq *fq = &local->fq;
+ struct ps_data *ps = NULL;
+ struct txq_info *txqi;
+ struct sta_info *sta;
+ int i;
+
+ spin_lock_bh(&fq->lock);
+
+ if (sdata->vif.type == NL80211_IFTYPE_AP)
+ ps = &sdata->bss->ps;
+
+ sdata->vif.txqs_stopped[ac] = false;
+
+ list_for_each_entry_rcu(sta, &local->sta_list, list) {
+ if (sdata != sta->sdata)
+ continue;
+
+ for (i = 0; i < ARRAY_SIZE(sta->sta.txq); i++) {
+ struct ieee80211_txq *txq = sta->sta.txq[i];
+
+ txqi = to_txq_info(txq);
+
+ if (ac != txq->ac)
+ continue;
+
+ if (!test_and_clear_bit(IEEE80211_TXQ_STOP_NETIF_TX,
+ &txqi->flags))
+ continue;
+
+ spin_unlock_bh(&fq->lock);
+ drv_wake_tx_queue(local, txqi);
+ spin_lock_bh(&fq->lock);
+ }
+ }
+
+ if (!vif->txq)
+ goto out;
+
+ txqi = to_txq_info(vif->txq);
+
+ if (!test_and_clear_bit(IEEE80211_TXQ_STOP_NETIF_TX, &txqi->flags) ||
+ (ps && atomic_read(&ps->num_sta_ps)) || ac != vif->txq->ac)
+ goto out;
+
+ spin_unlock_bh(&fq->lock);
+
+ drv_wake_tx_queue(local, txqi);
+ return;
+out:
+ spin_unlock_bh(&fq->lock);
+}
+
+void ieee80211_wake_txqs(unsigned long data)
+{
+ struct ieee80211_local *local = (struct ieee80211_local *)data;
+ struct ieee80211_sub_if_data *sdata;
+ int n_acs = IEEE80211_NUM_ACS;
+ unsigned long flags;
+ int i;
+
+ rcu_read_lock();
+ spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
+
+ if (local->hw.queues < IEEE80211_NUM_ACS)
+ n_acs = 1;
+
+ for (i = 0; i < local->hw.queues; i++) {
+ if (local->queue_stop_reasons[i])
+ continue;
+
+ spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
+ list_for_each_entry_rcu(sdata, &local->interfaces, list) {
+ int ac;
+
+ for (ac = 0; ac < n_acs; ac++) {
+ int ac_queue = sdata->vif.hw_queue[ac];
+
+ if (ac_queue == i ||
+ sdata->vif.cab_queue == i)
+ __ieee80211_wake_txqs(sdata, ac);
+ }
+ }
+ spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
+ }
+
+ spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
+ rcu_read_unlock();
+}
+
void ieee80211_propagate_queue_wake(struct ieee80211_local *local, int queue)
{
struct ieee80211_sub_if_data *sdata;
@@ -308,6 +401,9 @@ static void __ieee80211_wake_queue(struc
rcu_read_unlock();
} else
tasklet_schedule(&local->tx_pending_tasklet);
+
+ if (local->ops->wake_tx_queue)
+ tasklet_schedule(&local->wake_txqs_tasklet);
}
void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue,
@@ -351,9 +447,6 @@ static void __ieee80211_stop_queue(struc
if (__test_and_set_bit(reason, &local->queue_stop_reasons[queue]))
return;
- if (local->ops->wake_tx_queue)
- return;
-
if (local->hw.queues < IEEE80211_NUM_ACS)
n_acs = 1;
@@ -366,8 +459,15 @@ static void __ieee80211_stop_queue(struc
for (ac = 0; ac < n_acs; ac++) {
if (sdata->vif.hw_queue[ac] == queue ||
- sdata->vif.cab_queue == queue)
- netif_stop_subqueue(sdata->dev, ac);
+ sdata->vif.cab_queue == queue) {
+ if (!local->ops->wake_tx_queue) {
+ netif_stop_subqueue(sdata->dev, ac);
+ continue;
+ }
+ spin_lock(&local->fq.lock);
+ sdata->vif.txqs_stopped[ac] = true;
+ spin_unlock(&local->fq.lock);
+ }
}
}
rcu_read_unlock();

8
package/kernel/mac80211/patches/subsys/357-mac80211-add-hdrlen-to-ieee80211_tx_data.patch
View File

@ -48,7 +48,7 @@ Signed-off-by: Janusz Dziedzic <janusz.dziedzic@tieto.com>
if (likely(sta)) {
if (!IS_ERR(sta))
tx->sta = sta;
@@ -3507,6 +3507,7 @@ begin:
@@ -3513,6 +3513,7 @@ begin:
tx.local = local;
tx.skb = skb;
tx.sdata = vif_to_sdata(info->control.vif);
@ -56,7 +56,7 @@ Signed-off-by: Janusz Dziedzic <janusz.dziedzic@tieto.com>
if (txq->sta)
tx.sta = container_of(txq->sta, struct sta_info, sta);
@@ -3843,6 +3844,7 @@ ieee80211_build_data_template(struct iee
@@ -3850,6 +3851,7 @@ ieee80211_build_data_template(struct iee
hdr = (void *)skb->data;
tx.sta = sta_info_get(sdata, hdr->addr1);
tx.skb = skb;
@ -66,7 +66,7 @@ Signed-off-by: Janusz Dziedzic <janusz.dziedzic@tieto.com>
rcu_read_unlock();
--- a/net/mac80211/util.c
+++ b/net/mac80211/util.c
@@ -1290,6 +1290,7 @@ void ieee80211_send_auth(struct ieee8021
@@ -1390,6 +1390,7 @@ void ieee80211_send_auth(struct ieee8021
struct ieee80211_local *local = sdata->local;
struct sk_buff *skb;
struct ieee80211_mgmt *mgmt;
@ -74,7 +74,7 @@ Signed-off-by: Janusz Dziedzic <janusz.dziedzic@tieto.com>
int err;
/* 24 + 6 = header + auth_algo + auth_transaction + status_code */
@@ -1313,8 +1314,10 @@ void ieee80211_send_auth(struct ieee8021
@@ -1413,8 +1414,10 @@ void ieee80211_send_auth(struct ieee8021
skb_put_data(skb, extra, extra_len);
if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) {

12
package/kernel/mac80211/patches/subsys/358-mac80211-add-NEED_ALIGNED4_SKBS-hw-flag.patch
View File

@ -23,7 +23,7 @@ Signed-off-by: Janusz Dziedzic <janusz.dziedzic@tieto.com>
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -2127,6 +2127,9 @@ struct ieee80211_txq {
@@ -2131,6 +2131,9 @@ struct ieee80211_txq {
* @IEEE80211_HW_DOESNT_SUPPORT_QOS_NDP: The driver (or firmware) doesn't
* support QoS NDP for AP probing - that's most likely a driver bug.
*
@ -33,7 +33,7 @@ Signed-off-by: Janusz Dziedzic <janusz.dziedzic@tieto.com>
* @NUM_IEEE80211_HW_FLAGS: number of hardware flags, used for sizing arrays
*/
enum ieee80211_hw_flags {
@@ -2172,6 +2175,7 @@ enum ieee80211_hw_flags {
@@ -2176,6 +2179,7 @@ enum ieee80211_hw_flags {
IEEE80211_HW_SUPPORTS_TDLS_BUFFER_STA,
IEEE80211_HW_DEAUTH_NEED_MGD_TX_PREP,
IEEE80211_HW_DOESNT_SUPPORT_QOS_NDP,
@ -53,7 +53,7 @@ Signed-off-by: Janusz Dziedzic <janusz.dziedzic@tieto.com>
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -1557,6 +1557,29 @@ ieee80211_vif_get_num_mcast_if(struct ie
@@ -1559,6 +1559,29 @@ ieee80211_vif_get_num_mcast_if(struct ie
return -1;
}
@ -203,7 +203,7 @@ Signed-off-by: Janusz Dziedzic <janusz.dziedzic@tieto.com>
/* We store the key here so there's no point in using rcu_dereference()
* but that's fine because the code that changes the pointers will call
* this function after doing so. For a single CPU that would be enough,
@@ -3534,7 +3543,7 @@ begin:
@@ -3540,7 +3549,7 @@ begin:
if (tx.key &&
(tx.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV))
@ -214,7 +214,7 @@ Signed-off-by: Janusz Dziedzic <janusz.dziedzic@tieto.com>
tx.key, skb);
--- a/net/mac80211/util.c
+++ b/net/mac80211/util.c
@@ -1288,6 +1288,7 @@ void ieee80211_send_auth(struct ieee8021
@@ -1388,6 +1388,7 @@ void ieee80211_send_auth(struct ieee8021
u32 tx_flags)
{
struct ieee80211_local *local = sdata->local;
@ -222,7 +222,7 @@ Signed-off-by: Janusz Dziedzic <janusz.dziedzic@tieto.com>
struct sk_buff *skb;
struct ieee80211_mgmt *mgmt;
unsigned int hdrlen;
@@ -1314,7 +1315,7 @@ void ieee80211_send_auth(struct ieee8021
@@ -1414,7 +1415,7 @@ void ieee80211_send_auth(struct ieee8021
skb_put_data(skb, extra, extra_len);
if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) {

4
package/kernel/mac80211/patches/subsys/371-mac80211-minstrel-merge-with-minstrel_ht-always-enab.patch
View File

@ -67,7 +67,7 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
ccflags-y += -DDEBUG
--- a/net/mac80211/main.c
+++ b/net/mac80211/main.c
@@ -1304,18 +1304,12 @@ static int __init ieee80211_init(void)
@@ -1308,18 +1308,12 @@ static int __init ieee80211_init(void)
if (ret)
return ret;
@ -86,7 +86,7 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
rc80211_minstrel_exit();
return ret;
@@ -1323,7 +1317,6 @@ static int __init ieee80211_init(void)
@@ -1327,7 +1321,6 @@ static int __init ieee80211_init(void)
static void __exit ieee80211_exit(void)
{

4
package/kernel/mac80211/patches/subsys/383-mac80211-minstrel_ht-add-flag-to-indicate-missing-in.patch
View File

@ -13,7 +13,7 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -2130,6 +2130,9 @@ struct ieee80211_txq {
@@ -2134,6 +2134,9 @@ struct ieee80211_txq {
* @IEEE80211_HW_NEEDS_ALIGNED4_SKBS: Driver need aligned skbs to four-byte.
* Padding will be added after ieee80211_hdr, before IV/LLC.
*
@ -23,7 +23,7 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
* @NUM_IEEE80211_HW_FLAGS: number of hardware flags, used for sizing arrays
*/
enum ieee80211_hw_flags {
@@ -2176,6 +2179,7 @@ enum ieee80211_hw_flags {
@@ -2180,6 +2183,7 @@ enum ieee80211_hw_flags {
IEEE80211_HW_DEAUTH_NEED_MGD_TX_PREP,
IEEE80211_HW_DOESNT_SUPPORT_QOS_NDP,
IEEE80211_HW_NEEDS_ALIGNED4_SKBS,

2
package/kernel/mac80211/patches/subsys/522-mac80211_configure_antenna_gain.patch
View File

@ -112,7 +112,7 @@
CFG80211_TESTMODE_CMD(ieee80211_testmode_cmd)
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -1352,6 +1352,7 @@ struct ieee80211_local {
@@ -1354,6 +1354,7 @@ struct ieee80211_local {
int dynamic_ps_forced_timeout;
int user_power_level; /* in dBm, for all interfaces */