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wl12xx: implement Tx watermarks per AC

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Each AC is stopped when its queue is filled up to the high watermark,
and restarted when its queue it lower than the low watermark. This
ensures congested ACs are not able to starve other ACs.

Signed-off-by: Arik Nemtsov <arik@wizery.com>
Signed-off-by: Luciano Coelho <coelho@ti.com>
This commit is contained in:
Arik Nemtsov 2011-06-24 13:03:37 +03:00 committed by Luciano Coelho
parent 787b2dc44a
commit 708bb3cf58
4 changed files with 37 additions and 13 deletions
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13
drivers/net/wireless/wl12xx/main.c
View File

@ -1497,10 +1497,11 @@ static void wl1271_op_tx(struct ieee80211_hw *hw, struct sk_buff *skb)
{
struct wl1271 *wl = hw->priv;
unsigned long flags;
int q;
int q, mapping;
u8 hlid = 0;
q = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
mapping = skb_get_queue_mapping(skb);
q = wl1271_tx_get_queue(mapping);
if (wl->bss_type == BSS_TYPE_AP_BSS)
hlid = wl1271_tx_get_hlid(skb);
@ -1513,10 +1514,10 @@ static void wl1271_op_tx(struct ieee80211_hw *hw, struct sk_buff *skb)
* The workqueue is slow to process the tx_queue and we need stop
* the queue here, otherwise the queue will get too long.
*/
if (wl->tx_queue_count >= WL1271_TX_QUEUE_HIGH_WATERMARK) {
wl1271_debug(DEBUG_TX, "op_tx: stopping queues");
ieee80211_stop_queues(wl->hw);
set_bit(WL1271_FLAG_TX_QUEUE_STOPPED, &wl->flags);
if (skb_queue_len(&wl->tx_queue[q]) >= WL1271_TX_QUEUE_HIGH_WATERMARK) {
wl1271_debug(DEBUG_TX, "op_tx: stopping queues for q %d", q);
ieee80211_stop_queue(wl->hw, mapping);
set_bit(q, &wl->stopped_queues_map);
}
/* queue the packet */

14
drivers/net/wireless/wl12xx/tx.c
View File

@ -444,16 +444,21 @@ u32 wl1271_tx_enabled_rates_get(struct wl1271 *wl, u32 rate_set)
void wl1271_handle_tx_low_watermark(struct wl1271 *wl)
{
unsigned long flags;
int i;
if (test_bit(WL1271_FLAG_TX_QUEUE_STOPPED, &wl->flags) &&
wl->tx_queue_count <= WL1271_TX_QUEUE_LOW_WATERMARK) {
for (i = 0; i < NUM_TX_QUEUES; i++) {
if (test_bit(i, &wl->stopped_queues_map) &&
skb_queue_len(&wl->tx_queue[i]) <=
WL1271_TX_QUEUE_LOW_WATERMARK) {
/* firmware buffer has space, restart queues */
spin_lock_irqsave(&wl->wl_lock, flags);
ieee80211_wake_queues(wl->hw);
clear_bit(WL1271_FLAG_TX_QUEUE_STOPPED, &wl->flags);
ieee80211_wake_queue(wl->hw,
wl1271_tx_get_mac80211_queue(i));
clear_bit(i, &wl->stopped_queues_map);
spin_unlock_irqrestore(&wl->wl_lock, flags);
}
}
}
static struct sk_buff_head *wl1271_select_queue(struct wl1271 *wl,
struct sk_buff_head *queues)
@ -863,6 +868,7 @@ void wl1271_tx_reset(struct wl1271 *wl, bool reset_tx_queues)
}
wl->tx_queue_count = 0;
wl->stopped_queues_map = 0;
/*
* Make sure the driver is at a consistent state, in case this

16
drivers/net/wireless/wl12xx/tx.h
View File

@ -182,6 +182,22 @@ static inline int wl1271_tx_get_queue(int queue)
}
}
static inline int wl1271_tx_get_mac80211_queue(int queue)
{
switch (queue) {
case CONF_TX_AC_VO:
return 0;
case CONF_TX_AC_VI:
return 1;
case CONF_TX_AC_BE:
return 2;
case CONF_TX_AC_BK:
return 3;
default:
return 2;
}
}
void wl1271_tx_work(struct work_struct *work);
void wl1271_tx_work_locked(struct wl1271 *wl);
void wl1271_tx_complete(struct wl1271 *wl);

1
drivers/net/wireless/wl12xx/wl12xx.h
View File

@ -439,6 +439,7 @@ struct wl1271 {
/* Frames scheduled for transmission, not handled yet */
struct sk_buff_head tx_queue[NUM_TX_QUEUES];
int tx_queue_count;
long stopped_queues_map;
/* Frames received, not handled yet by mac80211 */
struct sk_buff_head deferred_rx_queue;