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ar9170: xmit code revamp

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This patch is a back-port from aggregation testing code.

In the past, we didn't limit the amount of active tx urbs.
However, ar9170 only has a limited buffer reserved for
pending data frames.

This wasn't much of a problem with the slower 802.11b/g.
We simply stopped the full queue and moved on to something different
in the mean time. But - as you guessed it -  this simple approach
stands in way for a decent aggregation implementation.

Signed-off-by: Christian Lamparter <chunkeey@web.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Christian Lamparter 2009-06-06 05:07:23 +02:00 committed by John W. Linville
parent 2543a0c4c0
commit 9b9c5aaeed
5 changed files with 551 additions and 261 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

34
drivers/net/wireless/ath/ar9170/ar9170.h
View file

@ -109,6 +109,11 @@ struct ar9170_rxstream_mpdu_merge {
bool has_plcp;
};
#define AR9170_QUEUE_TIMEOUT 64
#define AR9170_TX_TIMEOUT 8
#define AR9170_JANITOR_DELAY 128
#define AR9170_TX_INVALID_RATE 0xffffffff
struct ar9170 {
struct ieee80211_hw *hw;
struct mutex mutex;
@ -117,10 +122,11 @@ struct ar9170 {
int (*open)(struct ar9170 *);
void (*stop)(struct ar9170 *);
int (*tx)(struct ar9170 *, struct sk_buff *, bool, unsigned int);
int (*tx)(struct ar9170 *, struct sk_buff *);
int (*exec_cmd)(struct ar9170 *, enum ar9170_cmd, u32 ,
void *, u32 , void *);
void (*callback_cmd)(struct ar9170 *, u32 , void *);
int (*flush)(struct ar9170 *);
/* interface mode settings */
struct ieee80211_vif *vif;
@ -177,10 +183,10 @@ struct ar9170 {
struct ar9170_eeprom eeprom;
struct ath_regulatory regulatory;
/* global tx status for unregistered Stations. */
struct sk_buff_head global_tx_status;
struct sk_buff_head global_tx_status_waste;
struct delayed_work tx_status_janitor;
/* tx queues - as seen by hw - */
struct sk_buff_head tx_pending[__AR9170_NUM_TXQ];
struct sk_buff_head tx_status[__AR9170_NUM_TXQ];
struct delayed_work tx_janitor;
/* rxstream mpdu merge */
struct ar9170_rxstream_mpdu_merge rx_mpdu;
@ -189,11 +195,19 @@ struct ar9170 {
};
struct ar9170_sta_info {
struct sk_buff_head tx_status[__AR9170_NUM_TXQ];
};
#define IS_STARTED(a) (a->state >= AR9170_STARTED)
#define IS_ACCEPTING_CMD(a) (a->state >= AR9170_IDLE)
#define AR9170_TX_FLAG_WAIT_FOR_ACK BIT(0)
#define AR9170_TX_FLAG_NO_ACK BIT(1)
#define AR9170_TX_FLAG_BLOCK_ACK BIT(2)
struct ar9170_tx_info {
unsigned long timeout;
unsigned int flags;
};
#define IS_STARTED(a) (((struct ar9170 *)a)->state >= AR9170_STARTED)
#define IS_ACCEPTING_CMD(a) (((struct ar9170 *)a)->state >= AR9170_IDLE)
#define AR9170_FILTER_CHANGED_MODE BIT(0)
#define AR9170_FILTER_CHANGED_MULTICAST BIT(1)
@ -204,9 +218,9 @@ void *ar9170_alloc(size_t priv_size);
int ar9170_register(struct ar9170 *ar, struct device *pdev);
void ar9170_rx(struct ar9170 *ar, struct sk_buff *skb);
void ar9170_unregister(struct ar9170 *ar);
void ar9170_handle_tx_status(struct ar9170 *ar, struct sk_buff *skb,
bool update_statistics, u16 tx_status);
void ar9170_tx_callback(struct ar9170 *ar, struct sk_buff *skb);
void ar9170_handle_command_response(struct ar9170 *ar, void *buf, u32 len);
int ar9170_nag_limiter(struct ar9170 *ar);
/* MAC */
int ar9170_op_tx(struct ieee80211_hw *hw, struct sk_buff *skb);

3
drivers/net/wireless/ath/ar9170/hw.h
View file

@ -420,4 +420,7 @@ enum ar9170_txq {
__AR9170_NUM_TXQ,
};
#define AR9170_TXQ_DEPTH 32
#define AR9170_TX_MAX_PENDING 128
#endif /* __AR9170_HW_H */

646
drivers/net/wireless/ath/ar9170/main.c
View file

@ -173,59 +173,122 @@ static struct ieee80211_supported_band ar9170_band_5GHz = {
.ht_cap = AR9170_HT_CAP,
};
#ifdef AR9170_QUEUE_DEBUG
/*
* In case some wants works with AR9170's crazy tx_status queueing techniques.
* He might need this rather useful probing function.
*
* NOTE: caller must hold the queue's spinlock!
*/
static void ar9170_tx(struct ar9170 *ar);
#ifdef AR9170_QUEUE_DEBUG
static void ar9170_print_txheader(struct ar9170 *ar, struct sk_buff *skb)
{
struct ar9170_tx_control *txc = (void *) skb->data;
struct ieee80211_hdr *hdr = (void *)txc->frame_data;
struct ieee80211_tx_info *txinfo = IEEE80211_SKB_CB(skb);
struct ar9170_tx_info *arinfo = (void *) txinfo->rate_driver_data;
struct ieee80211_hdr *hdr = (void *) txc->frame_data;
printk(KERN_DEBUG "%s: => FRAME [skb:%p, queue:%d, DA:[%pM] "
"mac_control:%04x, phy_control:%08x]\n",
printk(KERN_DEBUG "%s: => FRAME [skb:%p, q:%d, DA:[%pM] flags:%x "
"mac_ctrl:%04x, phy_ctrl:%08x, timeout:[%d ms]]\n",
wiphy_name(ar->hw->wiphy), skb, skb_get_queue_mapping(skb),
ieee80211_get_DA(hdr), le16_to_cpu(txc->mac_control),
le32_to_cpu(txc->phy_control));
ieee80211_get_DA(hdr), arinfo->flags,
le16_to_cpu(txc->mac_control), le32_to_cpu(txc->phy_control),
jiffies_to_msecs(arinfo->timeout - jiffies));
}
static void ar9170_dump_station_tx_status_queue(struct ar9170 *ar,
struct sk_buff_head *queue)
static void __ar9170_dump_txqueue(struct ar9170 *ar,
struct sk_buff_head *queue)
{
struct sk_buff *skb;
int i = 0;
printk(KERN_DEBUG "---[ cut here ]---\n");
printk(KERN_DEBUG "%s: %d entries in tx_status queue.\n",
printk(KERN_DEBUG "%s: %d entries in queue.\n",
wiphy_name(ar->hw->wiphy), skb_queue_len(queue));
skb_queue_walk(queue, skb) {
struct ar9170_tx_control *txc = (void *) skb->data;
struct ieee80211_hdr *hdr = (void *)txc->frame_data;
printk(KERN_DEBUG "index:%d => \n", i);
printk(KERN_DEBUG "index:%d => \n", i++);
ar9170_print_txheader(ar, skb);
}
if (i != skb_queue_len(queue))
printk(KERN_DEBUG "WARNING: queue frame counter "
"mismatch %d != %d\n", skb_queue_len(queue), i);
printk(KERN_DEBUG "---[ end ]---\n");
}
#endif /* AR9170_QUEUE_DEBUG */
void ar9170_handle_tx_status(struct ar9170 *ar, struct sk_buff *skb,
bool valid_status, u16 tx_status)
static void ar9170_dump_txqueue(struct ar9170 *ar,
struct sk_buff_head *queue)
{
unsigned long flags;
spin_lock_irqsave(&queue->lock, flags);
__ar9170_dump_txqueue(ar, queue);
spin_unlock_irqrestore(&queue->lock, flags);
}
static void __ar9170_dump_txstats(struct ar9170 *ar)
{
int i;
printk(KERN_DEBUG "%s: QoS queue stats\n",
wiphy_name(ar->hw->wiphy));
for (i = 0; i < __AR9170_NUM_TXQ; i++)
printk(KERN_DEBUG "%s: queue:%d limit:%d len:%d waitack:%d\n",
wiphy_name(ar->hw->wiphy), i, ar->tx_stats[i].limit,
ar->tx_stats[i].len, skb_queue_len(&ar->tx_status[i]));
}
static void ar9170_dump_txstats(struct ar9170 *ar)
{
struct ieee80211_tx_info *txinfo;
unsigned int retries = 0, queue = skb_get_queue_mapping(skb);
unsigned long flags;
spin_lock_irqsave(&ar->tx_stats_lock, flags);
ar->tx_stats[queue].len--;
if (ieee80211_queue_stopped(ar->hw, queue))
ieee80211_wake_queue(ar->hw, queue);
__ar9170_dump_txstats(ar);
spin_unlock_irqrestore(&ar->tx_stats_lock, flags);
}
#endif /* AR9170_QUEUE_DEBUG */
/* caller must guarantee exclusive access for _bin_ queue. */
static void ar9170_recycle_expired(struct ar9170 *ar,
struct sk_buff_head *queue,
struct sk_buff_head *bin)
{
struct sk_buff *skb, *old = NULL;
unsigned long flags;
spin_lock_irqsave(&queue->lock, flags);
while ((skb = skb_peek(queue))) {
struct ieee80211_tx_info *txinfo;
struct ar9170_tx_info *arinfo;
txinfo = IEEE80211_SKB_CB(skb);
arinfo = (void *) txinfo->rate_driver_data;
if (time_is_before_jiffies(arinfo->timeout)) {
#ifdef AR9170_QUEUE_DEBUG
printk(KERN_DEBUG "%s: [%ld > %ld] frame expired => "
"recycle \n", wiphy_name(ar->hw->wiphy),
jiffies, arinfo->timeout);
ar9170_print_txheader(ar, skb);
#endif /* AR9170_QUEUE_DEBUG */
__skb_unlink(skb, queue);
__skb_queue_tail(bin, skb);
} else {
break;
}
if (unlikely(old == skb)) {
/* bail out - queue is shot. */
WARN_ON(1);
break;
}
old = skb;
}
spin_unlock_irqrestore(&queue->lock, flags);
}
static void ar9170_tx_status(struct ar9170 *ar, struct sk_buff *skb,
u16 tx_status)
{
struct ieee80211_tx_info *txinfo;
unsigned int retries = 0;
txinfo = IEEE80211_SKB_CB(skb);
ieee80211_tx_info_clear_status(txinfo);
@ -247,45 +310,61 @@ void ar9170_handle_tx_status(struct ar9170 *ar, struct sk_buff *skb,
break;
}
if (valid_status)
txinfo->status.rates[0].count = retries + 1;
txinfo->status.rates[0].count = retries + 1;
skb_pull(skb, sizeof(struct ar9170_tx_control));
ieee80211_tx_status_irqsafe(ar->hw, skb);
}
static struct sk_buff *ar9170_find_skb_in_queue(struct ar9170 *ar,
const u8 *mac,
const u32 queue,
struct sk_buff_head *q)
void ar9170_tx_callback(struct ar9170 *ar, struct sk_buff *skb)
{
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
struct ar9170_tx_info *arinfo = (void *) info->rate_driver_data;
unsigned int queue = skb_get_queue_mapping(skb);
unsigned long flags;
struct sk_buff *skb;
spin_lock_irqsave(&q->lock, flags);
skb_queue_walk(q, skb) {
struct ar9170_tx_control *txc = (void *) skb->data;
struct ieee80211_hdr *hdr = (void *) txc->frame_data;
u32 txc_queue = (le32_to_cpu(txc->phy_control) &
AR9170_TX_PHY_QOS_MASK) >>
AR9170_TX_PHY_QOS_SHIFT;
spin_lock_irqsave(&ar->tx_stats_lock, flags);
ar->tx_stats[queue].len--;
if ((queue != txc_queue) ||
(compare_ether_addr(ieee80211_get_DA(hdr), mac)))
continue;
__skb_unlink(skb, q);
spin_unlock_irqrestore(&q->lock, flags);
return skb;
if (skb_queue_empty(&ar->tx_pending[queue])) {
#ifdef AR9170_QUEUE_STOP_DEBUG
printk(KERN_DEBUG "%s: wake queue %d\n",
wiphy_name(ar->hw->wiphy), queue);
__ar9170_dump_txstats(ar);
#endif /* AR9170_QUEUE_STOP_DEBUG */
ieee80211_wake_queue(ar->hw, queue);
}
spin_unlock_irqrestore(&ar->tx_stats_lock, flags);
if (arinfo->flags & AR9170_TX_FLAG_BLOCK_ACK) {
dev_kfree_skb_any(skb);
} else if (arinfo->flags & AR9170_TX_FLAG_WAIT_FOR_ACK) {
arinfo->timeout = jiffies +
msecs_to_jiffies(AR9170_TX_TIMEOUT);
skb_queue_tail(&ar->tx_status[queue], skb);
} else if (arinfo->flags & AR9170_TX_FLAG_NO_ACK) {
ar9170_tx_status(ar, skb, AR9170_TX_STATUS_FAILED);
} else {
#ifdef AR9170_QUEUE_DEBUG
printk(KERN_DEBUG "%s: unsupported frame flags!\n",
wiphy_name(ar->hw->wiphy));
ar9170_print_txheader(ar, skb);
#endif /* AR9170_QUEUE_DEBUG */
dev_kfree_skb_any(skb);
}
if (!ar->tx_stats[queue].len &&
!skb_queue_empty(&ar->tx_pending[queue])) {
ar9170_tx(ar);
}
spin_unlock_irqrestore(&q->lock, flags);
return NULL;
}
static struct sk_buff *ar9170_find_queued_skb(struct ar9170 *ar, const u8 *mac,
const u32 queue)
static struct sk_buff *ar9170_get_queued_skb(struct ar9170 *ar,
const u8 *mac,
struct sk_buff_head *queue,
const u32 rate)
{
struct ieee80211_sta *sta;
unsigned long flags;
struct sk_buff *skb;
/*
@ -296,78 +375,91 @@ static struct sk_buff *ar9170_find_queued_skb(struct ar9170 *ar, const u8 *mac,
* the firmware provided (-> destination MAC, and phy_control) -
* and hope that we picked the right one...
*/
rcu_read_lock();
sta = ieee80211_find_sta(ar->hw, mac);
if (likely(sta)) {
struct ar9170_sta_info *sta_priv = (void *) sta->drv_priv;
skb = skb_dequeue(&sta_priv->tx_status[queue]);
rcu_read_unlock();
if (likely(skb))
return skb;
} else
rcu_read_unlock();
spin_lock_irqsave(&queue->lock, flags);
skb_queue_walk(queue, skb) {
struct ar9170_tx_control *txc = (void *) skb->data;
struct ieee80211_hdr *hdr = (void *) txc->frame_data;
u32 r;
/* scan the waste queue for candidates */
skb = ar9170_find_skb_in_queue(ar, mac, queue,
&ar->global_tx_status_waste);
if (!skb) {
/* so it still _must_ be in the global list. */
skb = ar9170_find_skb_in_queue(ar, mac, queue,
&ar->global_tx_status);
if (mac && compare_ether_addr(ieee80211_get_DA(hdr), mac)) {
#ifdef AR9170_QUEUE_DEBUG
printk(KERN_DEBUG "%s: skip frame => DA %pM != %pM\n",
wiphy_name(ar->hw->wiphy), mac,
ieee80211_get_DA(hdr));
ar9170_print_txheader(ar, skb);
#endif /* AR9170_QUEUE_DEBUG */
continue;
}
r = (le32_to_cpu(txc->phy_control) & AR9170_TX_PHY_MCS_MASK) >>
AR9170_TX_PHY_MCS_SHIFT;
if ((rate != AR9170_TX_INVALID_RATE) && (r != rate)) {
#ifdef AR9170_QUEUE_DEBUG
printk(KERN_DEBUG "%s: skip frame => rate %d != %d\n",
wiphy_name(ar->hw->wiphy), rate, r);
ar9170_print_txheader(ar, skb);
#endif /* AR9170_QUEUE_DEBUG */
continue;
}
__skb_unlink(skb, queue);
spin_unlock_irqrestore(&queue->lock, flags);
return skb;
}
#ifdef AR9170_QUEUE_DEBUG
if (unlikely((!skb) && net_ratelimit())) {
printk(KERN_ERR "%s: ESS:[%pM] does not have any "
"outstanding frames in this queue (%d).\n",
wiphy_name(ar->hw->wiphy), mac, queue);
}
printk(KERN_ERR "%s: ESS:[%pM] does not have any "
"outstanding frames in queue.\n",
wiphy_name(ar->hw->wiphy), mac);
__ar9170_dump_txqueue(ar, queue);
#endif /* AR9170_QUEUE_DEBUG */
return skb;
spin_unlock_irqrestore(&queue->lock, flags);
return NULL;
}
/*
* This worker tries to keep the global tx_status queue empty.
* So we can guarantee that incoming tx_status reports for
* unregistered stations are always synced with the actual
* frame - which we think - belongs to.
* This worker tries to keeps an maintain tx_status queues.
* So we can guarantee that incoming tx_status reports are
* actually for a pending frame.
*/
static void ar9170_tx_status_janitor(struct work_struct *work)
static void ar9170_tx_janitor(struct work_struct *work)
{
struct ar9170 *ar = container_of(work, struct ar9170,
tx_status_janitor.work);
struct sk_buff *skb;
tx_janitor.work);
struct sk_buff_head waste;
unsigned int i;
bool resched = false;
if (unlikely(!IS_STARTED(ar)))
return ;
/* recycle the garbage back to mac80211... one by one. */
while ((skb = skb_dequeue(&ar->global_tx_status_waste))) {
skb_queue_head_init(&waste);
for (i = 0; i < __AR9170_NUM_TXQ; i++) {
#ifdef AR9170_QUEUE_DEBUG
printk(KERN_DEBUG "%s: dispose queued frame =>\n",
wiphy_name(ar->hw->wiphy));
ar9170_print_txheader(ar, skb);
printk(KERN_DEBUG "%s: garbage collector scans queue:%d\n",
wiphy_name(ar->hw->wiphy), i);
ar9170_dump_txqueue(ar, &ar->tx_pending[i]);
ar9170_dump_txqueue(ar, &ar->tx_status[i]);
#endif /* AR9170_QUEUE_DEBUG */
ar9170_handle_tx_status(ar, skb, false,
AR9170_TX_STATUS_FAILED);
ar9170_recycle_expired(ar, &ar->tx_status[i], &waste);
ar9170_recycle_expired(ar, &ar->tx_pending[i], &waste);
skb_queue_purge(&waste);
if (!skb_queue_empty(&ar->tx_status[i]) ||
!skb_queue_empty(&ar->tx_pending[i]))
resched = true;
}
while ((skb = skb_dequeue(&ar->global_tx_status))) {
#ifdef AR9170_QUEUE_DEBUG
printk(KERN_DEBUG "%s: moving frame into waste queue =>\n",
wiphy_name(ar->hw->wiphy));
ar9170_print_txheader(ar, skb);
#endif /* AR9170_QUEUE_DEBUG */
skb_queue_tail(&ar->global_tx_status_waste, skb);
}
/* recall the janitor in 100ms - if there's garbage in the can. */
if (skb_queue_len(&ar->global_tx_status_waste) > 0)
queue_delayed_work(ar->hw->workqueue, &ar->tx_status_janitor,
msecs_to_jiffies(100));
if (resched)
queue_delayed_work(ar->hw->workqueue,
&ar->tx_janitor,
msecs_to_jiffies(AR9170_JANITOR_DELAY));
}
void ar9170_handle_command_response(struct ar9170 *ar, void *buf, u32 len)
@ -394,15 +486,21 @@ void ar9170_handle_command_response(struct ar9170 *ar, void *buf, u32 len)
*/
struct sk_buff *skb;
u32 queue = (le32_to_cpu(cmd->tx_status.rate) &
AR9170_TX_PHY_QOS_MASK) >> AR9170_TX_PHY_QOS_SHIFT;
u32 phy = le32_to_cpu(cmd->tx_status.rate);
u32 q = (phy & AR9170_TX_PHY_QOS_MASK) >>
AR9170_TX_PHY_QOS_SHIFT;
#ifdef AR9170_QUEUE_DEBUG
printk(KERN_DEBUG "%s: recv tx_status for %pM, p:%08x, q:%d\n",
wiphy_name(ar->hw->wiphy), cmd->tx_status.dst, phy, q);
#endif /* AR9170_QUEUE_DEBUG */
skb = ar9170_find_queued_skb(ar, cmd->tx_status.dst, queue);
skb = ar9170_get_queued_skb(ar, cmd->tx_status.dst,
&ar->tx_status[q],
AR9170_TX_INVALID_RATE);
if (unlikely(!skb))
return ;
ar9170_handle_tx_status(ar, skb, true,
le16_to_cpu(cmd->tx_status.status));
ar9170_tx_status(ar, skb, le16_to_cpu(cmd->tx_status.status));
break;
}
@ -487,7 +585,7 @@ static void ar9170_rx_reset_rx_mpdu(struct ar9170 *ar)
ar->rx_mpdu.has_plcp = false;
}
static int ar9170_nag_limiter(struct ar9170 *ar)
int ar9170_nag_limiter(struct ar9170 *ar)
{
bool print_message;
@ -988,8 +1086,8 @@ static int ar9170_op_start(struct ieee80211_hw *hw)
/* reinitialize queues statistics */
memset(&ar->tx_stats, 0, sizeof(ar->tx_stats));
for (i = 0; i < ARRAY_SIZE(ar->tx_stats); i++)
ar->tx_stats[i].limit = 8;
for (i = 0; i < __AR9170_NUM_TXQ; i++)
ar->tx_stats[i].limit = AR9170_TXQ_DEPTH;
/* reset QoS defaults */
AR9170_FILL_QUEUE(ar->edcf[0], 3, 15, 1023, 0); /* BEST EFFORT*/
@ -1035,18 +1133,17 @@ out:
static void ar9170_op_stop(struct ieee80211_hw *hw)
{
struct ar9170 *ar = hw->priv;
unsigned int i;
if (IS_STARTED(ar))
ar->state = AR9170_IDLE;
flush_workqueue(ar->hw->workqueue);
cancel_delayed_work_sync(&ar->tx_status_janitor);
cancel_delayed_work_sync(&ar->tx_janitor);
cancel_work_sync(&ar->filter_config_work);
cancel_work_sync(&ar->beacon_work);
mutex_lock(&ar->mutex);
skb_queue_purge(&ar->global_tx_status_waste);
skb_queue_purge(&ar->global_tx_status);
if (IS_ACCEPTING_CMD(ar)) {
ar9170_set_leds_state(ar, 0);
@ -1056,51 +1153,32 @@ static void ar9170_op_stop(struct ieee80211_hw *hw)
ar->stop(ar);
}
for (i = 0; i < __AR9170_NUM_TXQ; i++) {
skb_queue_purge(&ar->tx_pending[i]);
skb_queue_purge(&ar->tx_status[i]);
}
mutex_unlock(&ar->mutex);
}
int ar9170_op_tx(struct ieee80211_hw *hw, struct sk_buff *skb)
static int ar9170_tx_prepare(struct ar9170 *ar, struct sk_buff *skb)
{
struct ar9170 *ar = hw->priv;
struct ieee80211_hdr *hdr;
struct ar9170_tx_control *txc;
struct ieee80211_tx_info *info;
struct ieee80211_rate *rate = NULL;
struct ieee80211_tx_rate *txrate;
struct ar9170_tx_info *arinfo;
unsigned int queue = skb_get_queue_mapping(skb);
unsigned long flags = 0;
struct ar9170_sta_info *sta_info = NULL;
u32 power, chains;
u16 keytype = 0;
u16 len, icv = 0;
int err;
bool tx_status;
if (unlikely(!IS_STARTED(ar)))
goto err_free;
BUILD_BUG_ON(sizeof(*arinfo) > sizeof(info->rate_driver_data));
hdr = (void *)skb->data;
info = IEEE80211_SKB_CB(skb);
len = skb->len;
spin_lock_irqsave(&ar->tx_stats_lock, flags);
if (ar->tx_stats[queue].limit < ar->tx_stats[queue].len) {
spin_unlock_irqrestore(&ar->tx_stats_lock, flags);
return NETDEV_TX_OK;
}
ar->tx_stats[queue].len++;
ar->tx_stats[queue].count++;
if (ar->tx_stats[queue].limit == ar->tx_stats[queue].len)
ieee80211_stop_queue(hw, queue);
spin_unlock_irqrestore(&ar->tx_stats_lock, flags);
txc = (void *)skb_push(skb, sizeof(*txc));
tx_status = (((info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE) != 0) ||
((info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS) != 0));
if (info->control.hw_key) {
icv = info->control.hw_key->icv_len;
@ -1116,7 +1194,7 @@ int ar9170_op_tx(struct ieee80211_hw *hw, struct sk_buff *skb)
break;
default:
WARN_ON(1);
goto err_dequeue;
goto err_out;
}
}
@ -1133,16 +1211,65 @@ int ar9170_op_tx(struct ieee80211_hw *hw, struct sk_buff *skb)
if (info->flags & IEEE80211_TX_CTL_NO_ACK)
txc->mac_control |= cpu_to_le16(AR9170_TX_MAC_NO_ACK);
if (info->flags & IEEE80211_TX_CTL_AMPDU)
txc->mac_control |= cpu_to_le16(AR9170_TX_MAC_AGGR);
txrate = &info->control.rates[0];
if (txrate->flags & IEEE80211_TX_RC_USE_CTS_PROTECT)
txc->mac_control |= cpu_to_le16(AR9170_TX_MAC_PROT_CTS);
else if (txrate->flags & IEEE80211_TX_RC_USE_RTS_CTS)
txc->mac_control |= cpu_to_le16(AR9170_TX_MAC_PROT_RTS);
arinfo = (void *)info->rate_driver_data;
arinfo->timeout = jiffies + msecs_to_jiffies(AR9170_QUEUE_TIMEOUT);
if (!(info->flags & IEEE80211_TX_CTL_NO_ACK) &&
(is_valid_ether_addr(ieee80211_get_DA(hdr)))) {
if (info->flags & IEEE80211_TX_CTL_AMPDU) {
if (unlikely(!info->control.sta))
goto err_out;
txc->mac_control |= cpu_to_le16(AR9170_TX_MAC_AGGR);
arinfo->flags = AR9170_TX_FLAG_BLOCK_ACK;
goto out;
}
txc->mac_control |= cpu_to_le16(AR9170_TX_MAC_RATE_PROBE);
/*
* WARNING:
* Putting the QoS queue bits into an unexplored territory is
* certainly not elegant.
*
* In my defense: This idea provides a reasonable way to
* smuggle valuable information to the tx_status callback.
* Also, the idea behind this bit-abuse came straight from
* the original driver code.
*/
txc->phy_control |=
cpu_to_le32(queue << AR9170_TX_PHY_QOS_SHIFT);
arinfo->flags = AR9170_TX_FLAG_WAIT_FOR_ACK;
} else {
arinfo->flags = AR9170_TX_FLAG_NO_ACK;
}
out:
return 0;
err_out:
skb_pull(skb, sizeof(*txc));
return -EINVAL;
}
static void ar9170_tx_prepare_phy(struct ar9170 *ar, struct sk_buff *skb)
{
struct ar9170_tx_control *txc;
struct ieee80211_tx_info *info;
struct ieee80211_rate *rate = NULL;
struct ieee80211_tx_rate *txrate;
u32 power, chains;
txc = (void *) skb->data;
info = IEEE80211_SKB_CB(skb);
txrate = &info->control.rates[0];
if (txrate->flags & IEEE80211_TX_RC_GREEN_FIELD)
txc->phy_control |= cpu_to_le32(AR9170_TX_PHY_GREENFIELD);
@ -1162,9 +1289,12 @@ int ar9170_op_tx(struct ieee80211_hw *hw, struct sk_buff *skb)
u32 r = txrate->idx;
u8 *txpower;
/* heavy clip control */
txc->phy_control |= cpu_to_le32((r & 0x7) << 7);
r <<= AR9170_TX_PHY_MCS_SHIFT;
if (WARN_ON(r & ~AR9170_TX_PHY_MCS_MASK))
goto err_dequeue;
BUG_ON(r & ~AR9170_TX_PHY_MCS_MASK);
txc->phy_control |= cpu_to_le32(r & AR9170_TX_PHY_MCS_MASK);
txc->phy_control |= cpu_to_le32(AR9170_TX_PHY_MOD_HT);
@ -1226,53 +1356,154 @@ int ar9170_op_tx(struct ieee80211_hw *hw, struct sk_buff *skb)
chains = AR9170_TX_PHY_TXCHAIN_1;
}
txc->phy_control |= cpu_to_le32(chains << AR9170_TX_PHY_TXCHAIN_SHIFT);
}
if (tx_status) {
txc->mac_control |= cpu_to_le16(AR9170_TX_MAC_RATE_PROBE);
/*
* WARNING:
* Putting the QoS queue bits into an unexplored territory is
* certainly not elegant.
*
* In my defense: This idea provides a reasonable way to
* smuggle valuable information to the tx_status callback.
* Also, the idea behind this bit-abuse came straight from
* the original driver code.
*/
static void ar9170_tx(struct ar9170 *ar)
{
struct sk_buff *skb;
unsigned long flags;
struct ieee80211_tx_info *info;
struct ar9170_tx_info *arinfo;
unsigned int i, frames, frames_failed, remaining_space;
int err;
bool schedule_garbagecollector = false;
txc->phy_control |=
cpu_to_le32(queue << AR9170_TX_PHY_QOS_SHIFT);
BUILD_BUG_ON(sizeof(*arinfo) > sizeof(info->rate_driver_data));
if (info->control.sta) {
sta_info = (void *) info->control.sta->drv_priv;
skb_queue_tail(&sta_info->tx_status[queue], skb);
} else {
skb_queue_tail(&ar->global_tx_status, skb);
if (unlikely(!IS_STARTED(ar)))
return ;
queue_delayed_work(ar->hw->workqueue,
&ar->tx_status_janitor,
msecs_to_jiffies(100));
remaining_space = AR9170_TX_MAX_PENDING;
for (i = 0; i < __AR9170_NUM_TXQ; i++) {
spin_lock_irqsave(&ar->tx_stats_lock, flags);
if (ar->tx_stats[i].len >= ar->tx_stats[i].limit) {
#ifdef AR9170_QUEUE_DEBUG
printk(KERN_DEBUG "%s: queue %d full\n",
wiphy_name(ar->hw->wiphy), i);
__ar9170_dump_txstats(ar);
printk(KERN_DEBUG "stuck frames: ===> \n");
ar9170_dump_txqueue(ar, &ar->tx_pending[i]);
ar9170_dump_txqueue(ar, &ar->tx_status[i]);
#endif /* AR9170_QUEUE_DEBUG */
ieee80211_stop_queue(ar->hw, i);
spin_unlock_irqrestore(&ar->tx_stats_lock, flags);
continue;
}
frames = min(ar->tx_stats[i].limit - ar->tx_stats[i].len,
skb_queue_len(&ar->tx_pending[i]));
if (remaining_space < frames) {
#ifdef AR9170_QUEUE_DEBUG
printk(KERN_DEBUG "%s: tx quota reached queue:%d, "
"remaining slots:%d, needed:%d\n",
wiphy_name(ar->hw->wiphy), i, remaining_space,
frames);
ar9170_dump_txstats(ar);
#endif /* AR9170_QUEUE_DEBUG */
frames = remaining_space;
}
ar->tx_stats[i].len += frames;
ar->tx_stats[i].count += frames;
spin_unlock_irqrestore(&ar->tx_stats_lock, flags);
if (!frames)
continue;
frames_failed = 0;
while (frames) {
skb = skb_dequeue(&ar->tx_pending[i]);
if (unlikely(!skb)) {
frames_failed += frames;
frames = 0;
break;
}
info = IEEE80211_SKB_CB(skb);
arinfo = (void *) info->rate_driver_data;
/* TODO: cancel stuck frames */
arinfo->timeout = jiffies +
msecs_to_jiffies(AR9170_TX_TIMEOUT);
#ifdef AR9170_QUEUE_DEBUG
printk(KERN_DEBUG "%s: send frame q:%d =>\n",
wiphy_name(ar->hw->wiphy), i);
ar9170_print_txheader(ar, skb);
#endif /* AR9170_QUEUE_DEBUG */
err = ar->tx(ar, skb);
if (unlikely(err)) {
frames_failed++;
dev_kfree_skb_any(skb);
} else {
remaining_space--;
schedule_garbagecollector = true;
}
frames--;
}
#ifdef AR9170_QUEUE_DEBUG
printk(KERN_DEBUG "%s: ar9170_tx report for queue %d\n",
wiphy_name(ar->hw->wiphy), i);
printk(KERN_DEBUG "%s: unprocessed pending frames left:\n",
wiphy_name(ar->hw->wiphy));
ar9170_dump_txqueue(ar, &ar->tx_pending[i]);
#endif /* AR9170_QUEUE_DEBUG */
if (unlikely(frames_failed)) {
#ifdef AR9170_QUEUE_DEBUG
printk(KERN_DEBUG "%s: frames failed =>\n",
wiphy_name(ar->hw->wiphy), frames_failed);
#endif /* AR9170_QUEUE_DEBUG */
spin_lock_irqsave(&ar->tx_stats_lock, flags);
ar->tx_stats[i].len -= frames_failed;
ar->tx_stats[i].count -= frames_failed;
ieee80211_wake_queue(ar->hw, i);
spin_unlock_irqrestore(&ar->tx_stats_lock, flags);
}
}
err = ar->tx(ar, skb, tx_status, 0);
if (unlikely(tx_status && err)) {
if (info->control.sta)
skb_unlink(skb, &sta_info->tx_status[queue]);
else
skb_unlink(skb, &ar->global_tx_status);
if (schedule_garbagecollector)
queue_delayed_work(ar->hw->workqueue,
&ar->tx_janitor,
msecs_to_jiffies(AR9170_JANITOR_DELAY));
}
int ar9170_op_tx(struct ieee80211_hw *hw, struct sk_buff *skb)
{
struct ar9170 *ar = hw->priv;
struct ieee80211_tx_info *info;
if (unlikely(!IS_STARTED(ar)))
goto err_free;
if (unlikely(ar9170_tx_prepare(ar, skb)))
goto err_free;
info = IEEE80211_SKB_CB(skb);
if (info->flags & IEEE80211_TX_CTL_AMPDU) {
/* drop frame, we do not allow TX A-MPDU aggregation yet. */
goto err_free;
} else {
unsigned int queue = skb_get_queue_mapping(skb);
ar9170_tx_prepare_phy(ar, skb);
skb_queue_tail(&ar->tx_pending[queue], skb);
}
ar9170_tx(ar);
return NETDEV_TX_OK;
err_dequeue:
spin_lock_irqsave(&ar->tx_stats_lock, flags);
ar->tx_stats[queue].len--;
ar->tx_stats[queue].count--;
spin_unlock_irqrestore(&ar->tx_stats_lock, flags);
err_free:
dev_kfree_skb(skb);
dev_kfree_skb_any(skb);
return NETDEV_TX_OK;
}
@ -1698,43 +1929,6 @@ static void ar9170_sta_notify(struct ieee80211_hw *hw,
enum sta_notify_cmd cmd,
struct ieee80211_sta *sta)
{
struct ar9170 *ar = hw->priv;
struct ar9170_sta_info *info = (void *) sta->drv_priv;
struct sk_buff *skb;
unsigned int i;
switch (cmd) {
case STA_NOTIFY_ADD:
for (i = 0; i < ar->hw->queues; i++)
skb_queue_head_init(&info->tx_status[i]);
break;
case STA_NOTIFY_REMOVE:
/*
* transfer all outstanding frames that need a tx_status
* reports to the global tx_status queue
*/
for (i = 0; i < ar->hw->queues; i++) {
while ((skb = skb_dequeue(&info->tx_status[i]))) {
#ifdef AR9170_QUEUE_DEBUG
printk(KERN_DEBUG "%s: queueing frame in "
"global tx_status queue =>\n",
wiphy_name(ar->hw->wiphy));
ar9170_print_txheader(ar, skb);
#endif /* AR9170_QUEUE_DEBUG */
skb_queue_tail(&ar->global_tx_status, skb);
}
}
queue_delayed_work(ar->hw->workqueue, &ar->tx_status_janitor,
msecs_to_jiffies(100));
break;
default:
break;
}
}
static int ar9170_get_stats(struct ieee80211_hw *hw,
@ -1773,7 +1967,7 @@ static int ar9170_conf_tx(struct ieee80211_hw *hw, u16 queue,
int ret;
mutex_lock(&ar->mutex);
if ((param) && !(queue > ar->hw->queues)) {
if ((param) && !(queue > __AR9170_NUM_TXQ)) {
memcpy(&ar->edcf[ar9170_qos_hwmap[queue]],
param, sizeof(*param));
@ -1849,12 +2043,14 @@ void *ar9170_alloc(size_t priv_size)
mutex_init(&ar->mutex);
spin_lock_init(&ar->cmdlock);
spin_lock_init(&ar->tx_stats_lock);
skb_queue_head_init(&ar->global_tx_status);
skb_queue_head_init(&ar->global_tx_status_waste);
for (i = 0; i < __AR9170_NUM_TXQ; i++) {
skb_queue_head_init(&ar->tx_status[i]);
skb_queue_head_init(&ar->tx_pending[i]);
}
ar9170_rx_reset_rx_mpdu(ar);
INIT_WORK(&ar->filter_config_work, ar9170_set_filters);
INIT_WORK(&ar->beacon_work, ar9170_new_beacon);
INIT_DELAYED_WORK(&ar->tx_status_janitor, ar9170_tx_status_janitor);
INIT_DELAYED_WORK(&ar->tx_janitor, ar9170_tx_janitor);
/* all hw supports 2.4 GHz, so set channel to 1 by default */
ar->channel = &ar9170_2ghz_chantable[0];

122
drivers/net/wireless/ath/ar9170/usb.c
View file

@ -96,7 +96,49 @@ static struct usb_device_id ar9170_usb_ids[] = {
};
MODULE_DEVICE_TABLE(usb, ar9170_usb_ids);
static void ar9170_usb_tx_urb_complete_free(struct urb *urb)
static void ar9170_usb_submit_urb(struct ar9170_usb *aru)
{
struct urb *urb;
unsigned long flags;
int err;
if (unlikely(!IS_STARTED(&aru->common)))
return ;
spin_lock_irqsave(&aru->tx_urb_lock, flags);
if (aru->tx_submitted_urbs >= AR9170_NUM_TX_URBS) {
spin_unlock_irqrestore(&aru->tx_urb_lock, flags);
return ;
}
aru->tx_submitted_urbs++;
urb = usb_get_from_anchor(&aru->tx_pending);
if (!urb) {
aru->tx_submitted_urbs--;
spin_unlock_irqrestore(&aru->tx_urb_lock, flags);
return ;
}
spin_unlock_irqrestore(&aru->tx_urb_lock, flags);
aru->tx_pending_urbs--;
usb_anchor_urb(urb, &aru->tx_submitted);
err = usb_submit_urb(urb, GFP_ATOMIC);
if (unlikely(err)) {
if (ar9170_nag_limiter(&aru->common))
dev_err(&aru->udev->dev, "submit_urb failed (%d).\n",
err);
usb_unanchor_urb(urb);
aru->tx_submitted_urbs--;
ar9170_tx_callback(&aru->common, urb->context);
}
usb_free_urb(urb);
}
static void ar9170_usb_tx_urb_complete_frame(struct urb *urb)
{
struct sk_buff *skb = urb->context;
struct ar9170_usb *aru = (struct ar9170_usb *)
@ -107,8 +149,11 @@ static void ar9170_usb_tx_urb_complete_free(struct urb *urb)
return ;
}
ar9170_handle_tx_status(&aru->common, skb, false,
AR9170_TX_STATUS_COMPLETE);
aru->tx_submitted_urbs--;
ar9170_tx_callback(&aru->common, skb);
ar9170_usb_submit_urb(aru);
}
static void ar9170_usb_tx_urb_complete(struct urb *urb)
@ -290,21 +335,47 @@ err_out:
return err;
}
static void ar9170_usb_cancel_urbs(struct ar9170_usb *aru)
static int ar9170_usb_flush(struct ar9170 *ar)
{
int ret;
struct ar9170_usb *aru = (void *) ar;
struct urb *urb;
int ret, err = 0;
aru->common.state = AR9170_UNKNOWN_STATE;
if (IS_STARTED(ar))
aru->common.state = AR9170_IDLE;
usb_unlink_anchored_urbs(&aru->tx_submitted);
usb_wait_anchor_empty_timeout(&aru->tx_pending,
msecs_to_jiffies(800));
while ((urb = usb_get_from_anchor(&aru->tx_pending))) {
ar9170_tx_callback(&aru->common, (void *) urb->context);
usb_free_urb(urb);
}
/* give the LED OFF command and the deauth frame a chance to air. */
/* lets wait a while until the tx - queues are dried out */
ret = usb_wait_anchor_empty_timeout(&aru->tx_submitted,
msecs_to_jiffies(100));
if (ret == 0)
dev_err(&aru->udev->dev, "kill pending tx urbs.\n");
usb_poison_anchored_urbs(&aru->tx_submitted);
err = -ETIMEDOUT;
usb_kill_anchored_urbs(&aru->tx_submitted);
if (IS_ACCEPTING_CMD(ar))
aru->common.state = AR9170_STARTED;
return err;
}
static void ar9170_usb_cancel_urbs(struct ar9170_usb *aru)
{
int err;
aru->common.state = AR9170_UNKNOWN_STATE;
err = ar9170_usb_flush(&aru->common);
if (err)
dev_err(&aru->udev->dev, "stuck tx urbs!\n");
usb_poison_anchored_urbs(&aru->tx_submitted);
usb_poison_anchored_urbs(&aru->rx_submitted);
}
@ -388,12 +459,10 @@ err_free:
return err;
}
static int ar9170_usb_tx(struct ar9170 *ar, struct sk_buff *skb,
bool txstatus_needed, unsigned int extra_len)
static int ar9170_usb_tx(struct ar9170 *ar, struct sk_buff *skb)
{
struct ar9170_usb *aru = (struct ar9170_usb *) ar;
struct urb *urb;
int err;
if (unlikely(!IS_STARTED(ar))) {
/* Seriously, what were you drink... err... thinking!? */
@ -406,18 +475,17 @@ static int ar9170_usb_tx(struct ar9170 *ar, struct sk_buff *skb,
usb_fill_bulk_urb(urb, aru->udev,
usb_sndbulkpipe(aru->udev, AR9170_EP_TX),
skb->data, skb->len + extra_len, (txstatus_needed ?
ar9170_usb_tx_urb_complete :
ar9170_usb_tx_urb_complete_free), skb);
skb->data, skb->len,
ar9170_usb_tx_urb_complete_frame, skb);
urb->transfer_flags |= URB_ZERO_PACKET;
usb_anchor_urb(urb, &aru->tx_submitted);
err = usb_submit_urb(urb, GFP_ATOMIC);
if (unlikely(err))
usb_unanchor_urb(urb);
usb_anchor_urb(urb, &aru->tx_pending);
aru->tx_pending_urbs++;
usb_free_urb(urb);
return err;
ar9170_usb_submit_urb(aru);
return 0;
}
static void ar9170_usb_callback_cmd(struct ar9170 *ar, u32 len , void *buffer)
@ -617,10 +685,8 @@ static void ar9170_usb_stop(struct ar9170 *ar)
if (IS_ACCEPTING_CMD(ar))
aru->common.state = AR9170_STOPPED;
/* lets wait a while until the tx - queues are dried out */
ret = usb_wait_anchor_empty_timeout(&aru->tx_submitted,
msecs_to_jiffies(1000));
if (ret == 0)
ret = ar9170_usb_flush(ar);
if (ret)
dev_err(&aru->udev->dev, "kill pending tx urbs.\n");
usb_poison_anchored_urbs(&aru->tx_submitted);
@ -716,10 +782,16 @@ static int ar9170_usb_probe(struct usb_interface *intf,
SET_IEEE80211_DEV(ar->hw, &udev->dev);
init_usb_anchor(&aru->rx_submitted);
init_usb_anchor(&aru->tx_pending);
init_usb_anchor(&aru->tx_submitted);
init_completion(&aru->cmd_wait);
spin_lock_init(&aru->tx_urb_lock);
aru->tx_pending_urbs = 0;
aru->tx_submitted_urbs = 0;
aru->common.stop = ar9170_usb_stop;
aru->common.flush = ar9170_usb_flush;
aru->common.open = ar9170_usb_open;
aru->common.tx = ar9170_usb_tx;
aru->common.exec_cmd = ar9170_usb_exec_cmd;

7
drivers/net/wireless/ath/ar9170/usb.h
View file

@ -51,6 +51,7 @@
#include "ar9170.h"
#define AR9170_NUM_RX_URBS 16
#define AR9170_NUM_TX_URBS 8
struct firmware;
@ -60,11 +61,15 @@ struct ar9170_usb {
struct usb_interface *intf;
struct usb_anchor rx_submitted;
struct usb_anchor tx_pending;
struct usb_anchor tx_submitted;
bool req_one_stage_fw;
spinlock_t cmdlock;
spinlock_t tx_urb_lock;
unsigned int tx_submitted_urbs;
unsigned int tx_pending_urbs;
struct completion cmd_wait;
int readlen;
u8 *readbuf;