Commit f1a46384 authored by Arik Nemtsov's avatar Arik Nemtsov Committed by Luciano Coelho
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wl12xx: start/stop queues according to global per-AC counters



Split tx_queue_count to count per-AC skb's queued, instead of relying on
the skb-queue len. The skb queues used were only valid in STA-mode, as
AP-mode uses per-link queues.

This fixes a major regression in AP-mode, caused by the patch
"wl12xx: implement Tx watermarks per AC". With that patch applied, we
effectively had no regulation of Tx queues in AP-mode. Therefore a
sustained high rate of Tx could cause exhaustion of the skb memory pool.
Signed-off-by: default avatarArik Nemtsov <arik@wizery.com>
Signed-off-by: default avatarLuciano Coelho <coelho@ti.com>
parent 097f8821
......@@ -30,6 +30,7 @@
#include "acx.h"
#include "ps.h"
#include "io.h"
#include "tx.h"
/* ms */
#define WL1271_DEBUGFS_STATS_LIFETIME 1000
......@@ -233,7 +234,7 @@ static ssize_t tx_queue_len_read(struct file *file, char __user *userbuf,
char buf[20];
int res;
queue_len = wl->tx_queue_count;
queue_len = wl1271_tx_total_queue_count(wl);
res = scnprintf(buf, sizeof(buf), "%u\n", queue_len);
return simple_read_from_buffer(userbuf, count, ppos, buf, res);
......@@ -344,7 +345,10 @@ static ssize_t driver_state_read(struct file *file, char __user *user_buf,
DRIVER_STATE_PRINT_INT(tx_allocated_blocks[3]);
DRIVER_STATE_PRINT_INT(tx_frames_cnt);
DRIVER_STATE_PRINT_LHEX(tx_frames_map[0]);
DRIVER_STATE_PRINT_INT(tx_queue_count);
DRIVER_STATE_PRINT_INT(tx_queue_count[0]);
DRIVER_STATE_PRINT_INT(tx_queue_count[1]);
DRIVER_STATE_PRINT_INT(tx_queue_count[2]);
DRIVER_STATE_PRINT_INT(tx_queue_count[3]);
DRIVER_STATE_PRINT_INT(tx_packets_count);
DRIVER_STATE_PRINT_INT(tx_results_count);
DRIVER_STATE_PRINT_LHEX(flags);
......
......@@ -992,7 +992,7 @@ irqreturn_t wl1271_irq(int irq, void *cookie)
/* Check if any tx blocks were freed */
spin_lock_irqsave(&wl->wl_lock, flags);
if (!test_bit(WL1271_FLAG_FW_TX_BUSY, &wl->flags) &&
wl->tx_queue_count) {
wl1271_tx_total_queue_count(wl) > 0) {
spin_unlock_irqrestore(&wl->wl_lock, flags);
/*
* In order to avoid starvation of the TX path,
......@@ -1040,7 +1040,7 @@ out:
/* In case TX was not handled here, queue TX work */
clear_bit(WL1271_FLAG_TX_PENDING, &wl->flags);
if (!test_bit(WL1271_FLAG_FW_TX_BUSY, &wl->flags) &&
wl->tx_queue_count)
wl1271_tx_total_queue_count(wl) > 0)
ieee80211_queue_work(wl->hw, &wl->tx_work);
spin_unlock_irqrestore(&wl->wl_lock, flags);
......@@ -1508,13 +1508,13 @@ static void wl1271_op_tx(struct ieee80211_hw *hw, struct sk_buff *skb)
spin_lock_irqsave(&wl->wl_lock, flags);
wl->tx_queue_count++;
wl->tx_queue_count[q]++;
/*
* The workqueue is slow to process the tx_queue and we need stop
* the queue here, otherwise the queue will get too long.
*/
if (skb_queue_len(&wl->tx_queue[q]) >= WL1271_TX_QUEUE_HIGH_WATERMARK) {
if (wl->tx_queue_count[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);
......@@ -1543,10 +1543,11 @@ static void wl1271_op_tx(struct ieee80211_hw *hw, struct sk_buff *skb)
int wl1271_tx_dummy_packet(struct wl1271 *wl)
{
unsigned long flags;
int q = wl1271_tx_get_queue(skb_get_queue_mapping(wl->dummy_packet));
spin_lock_irqsave(&wl->wl_lock, flags);
set_bit(WL1271_FLAG_DUMMY_PACKET_PENDING, &wl->flags);
wl->tx_queue_count++;
wl->tx_queue_count[q]++;
spin_unlock_irqrestore(&wl->wl_lock, flags);
/* The FW is low on RX memory blocks, so send the dummy packet asap */
......@@ -3752,7 +3753,7 @@ static bool wl1271_tx_frames_pending(struct ieee80211_hw *hw)
goto out;
/* packets are considered pending if in the TX queue or the FW */
ret = (wl->tx_queue_count > 0) || (wl->tx_frames_cnt > 0);
ret = (wl1271_tx_total_queue_count(wl) > 0) || (wl->tx_frames_cnt > 0);
/* the above is appropriate for STA mode for PS purposes */
WARN_ON(wl->bss_type != BSS_TYPE_STA_BSS);
......
......@@ -193,24 +193,27 @@ int wl1271_ps_set_mode(struct wl1271 *wl, enum wl1271_cmd_ps_mode mode,
static void wl1271_ps_filter_frames(struct wl1271 *wl, u8 hlid)
{
int i, filtered = 0;
int i;
struct sk_buff *skb;
struct ieee80211_tx_info *info;
unsigned long flags;
int filtered[NUM_TX_QUEUES];
/* filter all frames currently the low level queus for this hlid */
for (i = 0; i < NUM_TX_QUEUES; i++) {
filtered[i] = 0;
while ((skb = skb_dequeue(&wl->links[hlid].tx_queue[i]))) {
info = IEEE80211_SKB_CB(skb);
info->flags |= IEEE80211_TX_STAT_TX_FILTERED;
info->status.rates[0].idx = -1;
ieee80211_tx_status_ni(wl->hw, skb);
filtered++;
filtered[i]++;
}
}
spin_lock_irqsave(&wl->wl_lock, flags);
wl->tx_queue_count -= filtered;
for (i = 0; i < NUM_TX_QUEUES; i++)
wl->tx_queue_count[i] -= filtered[i];
spin_unlock_irqrestore(&wl->wl_lock, flags);
wl1271_handle_tx_low_watermark(wl);
......
......@@ -448,8 +448,7 @@ void wl1271_handle_tx_low_watermark(struct wl1271 *wl)
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) {
wl->tx_queue_count[i] <= WL1271_TX_QUEUE_LOW_WATERMARK) {
/* firmware buffer has space, restart queues */
spin_lock_irqsave(&wl->wl_lock, flags);
ieee80211_wake_queue(wl->hw,
......@@ -498,8 +497,9 @@ static struct sk_buff *wl1271_sta_skb_dequeue(struct wl1271 *wl)
out:
if (skb) {
int q = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
spin_lock_irqsave(&wl->wl_lock, flags);
wl->tx_queue_count--;
wl->tx_queue_count[q]--;
spin_unlock_irqrestore(&wl->wl_lock, flags);
}
......@@ -535,9 +535,10 @@ static struct sk_buff *wl1271_ap_skb_dequeue(struct wl1271 *wl)
}
if (skb) {
int q = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
wl->last_tx_hlid = h;
spin_lock_irqsave(&wl->wl_lock, flags);
wl->tx_queue_count--;
wl->tx_queue_count[q]--;
spin_unlock_irqrestore(&wl->wl_lock, flags);
} else {
wl->last_tx_hlid = 0;
......@@ -558,9 +559,12 @@ static struct sk_buff *wl1271_skb_dequeue(struct wl1271 *wl)
if (!skb &&
test_and_clear_bit(WL1271_FLAG_DUMMY_PACKET_PENDING, &wl->flags)) {
int q;
skb = wl->dummy_packet;
q = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
spin_lock_irqsave(&wl->wl_lock, flags);
wl->tx_queue_count--;
wl->tx_queue_count[q]--;
spin_unlock_irqrestore(&wl->wl_lock, flags);
}
......@@ -585,7 +589,7 @@ static void wl1271_skb_queue_head(struct wl1271 *wl, struct sk_buff *skb)
}
spin_lock_irqsave(&wl->wl_lock, flags);
wl->tx_queue_count++;
wl->tx_queue_count[q]++;
spin_unlock_irqrestore(&wl->wl_lock, flags);
}
......@@ -813,23 +817,26 @@ void wl1271_tx_complete(struct wl1271 *wl)
void wl1271_tx_reset_link_queues(struct wl1271 *wl, u8 hlid)
{
struct sk_buff *skb;
int i, total = 0;
int i;
unsigned long flags;
struct ieee80211_tx_info *info;
int total[NUM_TX_QUEUES];
for (i = 0; i < NUM_TX_QUEUES; i++) {
total[i] = 0;
while ((skb = skb_dequeue(&wl->links[hlid].tx_queue[i]))) {
wl1271_debug(DEBUG_TX, "link freeing skb 0x%p", skb);
info = IEEE80211_SKB_CB(skb);
info->status.rates[0].idx = -1;
info->status.rates[0].count = 0;
ieee80211_tx_status_ni(wl->hw, skb);
total++;
total[i]++;
}
}
spin_lock_irqsave(&wl->wl_lock, flags);
wl->tx_queue_count -= total;
for (i = 0; i < NUM_TX_QUEUES; i++)
wl->tx_queue_count[i] -= total[i];
spin_unlock_irqrestore(&wl->wl_lock, flags);
wl1271_handle_tx_low_watermark(wl);
......@@ -864,10 +871,10 @@ void wl1271_tx_reset(struct wl1271 *wl, bool reset_tx_queues)
ieee80211_tx_status_ni(wl->hw, skb);
}
}
wl->tx_queue_count[i] = 0;
}
}
wl->tx_queue_count = 0;
wl->stopped_queues_map = 0;
/*
......@@ -921,8 +928,10 @@ void wl1271_tx_flush(struct wl1271 *wl)
while (!time_after(jiffies, timeout)) {
mutex_lock(&wl->mutex);
wl1271_debug(DEBUG_TX, "flushing tx buffer: %d %d",
wl->tx_frames_cnt, wl->tx_queue_count);
if ((wl->tx_frames_cnt == 0) && (wl->tx_queue_count == 0)) {
wl->tx_frames_cnt,
wl1271_tx_total_queue_count(wl));
if ((wl->tx_frames_cnt == 0) &&
(wl1271_tx_total_queue_count(wl) == 0)) {
mutex_unlock(&wl->mutex);
return;
}
......
......@@ -198,6 +198,16 @@ static inline int wl1271_tx_get_mac80211_queue(int queue)
}
}
static inline int wl1271_tx_total_queue_count(struct wl1271 *wl)
{
int i, count = 0;
for (i = 0; i < NUM_TX_QUEUES; i++)
count += wl->tx_queue_count[i];
return count;
}
void wl1271_tx_work(struct work_struct *work);
void wl1271_tx_work_locked(struct wl1271 *wl);
void wl1271_tx_complete(struct wl1271 *wl);
......
......@@ -438,7 +438,7 @@ struct wl1271 {
/* Frames scheduled for transmission, not handled yet */
struct sk_buff_head tx_queue[NUM_TX_QUEUES];
int tx_queue_count;
int tx_queue_count[NUM_TX_QUEUES];
long stopped_queues_map;
/* Frames received, not handled yet by mac80211 */
......
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