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// SPDX-License-Identifier: GPL-2.0-only
/*
* O(1) TX queue with built-in allocator.
*
* Copyright (c) 2017-2019, Silicon Laboratories, Inc.
* Copyright (c) 2010, ST-Ericsson
*/
#include <linux/sched.h>
#include <net/mac80211.h>
#include "queue.h"
#include "wfx.h"
#include "sta.h"
#include "data_tx.h"
void wfx_tx_lock(struct wfx_dev *wdev)
{
atomic_inc(&wdev->tx_lock);
}
void wfx_tx_unlock(struct wfx_dev *wdev)
{
int tx_lock = atomic_dec_return(&wdev->tx_lock);
WARN(tx_lock < 0, "inconsistent tx_lock value");
if (!tx_lock)
wfx_bh_request_tx(wdev);
}
void wfx_tx_flush(struct wfx_dev *wdev)
{
int ret;
int i;
// Do not wait for any reply if chip is frozen
if (wdev->chip_frozen)
return;
mutex_lock(&wdev->hif_cmd.lock);
ret = wait_event_timeout(wdev->hif.tx_buffers_empty,
!wdev->hif.tx_buffers_used,
msecs_to_jiffies(3000));
if (ret) {
for (i = 0; i < IEEE80211_NUM_ACS; i++)
WARN(atomic_read(&wdev->tx_queue[i].pending_frames),
"there are still %d pending frames on queue %d",
atomic_read(&wdev->tx_queue[i].pending_frames), i);
}
if (!ret) {
dev_warn(wdev->dev, "cannot flush tx buffers (%d still busy)\n",
wdev->hif.tx_buffers_used);
wfx_pending_dump_old_frames(wdev, 3000);
// FIXME: drop pending frames here
wdev->chip_frozen = 1;
}
mutex_unlock(&wdev->hif_cmd.lock);
}
void wfx_tx_lock_flush(struct wfx_dev *wdev)
{
wfx_tx_lock(wdev);
wfx_tx_flush(wdev);
}
/* If successful, LOCKS the TX queue! */
void wfx_tx_queues_wait_empty_vif(struct wfx_vif *wvif)
{
int i;
bool done;
struct wfx_queue *queue;
struct sk_buff *item;
struct wfx_dev *wdev = wvif->wdev;
struct hif_msg *hif;
if (wvif->wdev->chip_frozen) {
wfx_tx_lock_flush(wdev);
wfx_tx_queues_clear(wdev);
return;
}
do {
done = true;
wfx_tx_lock_flush(wdev);
for (i = 0; i < IEEE80211_NUM_ACS && done; ++i) {
queue = &wdev->tx_queue[i];
spin_lock_bh(&queue->normal.lock);
skb_queue_walk(&queue->normal, item) {
hif = (struct hif_msg *)item->data;
if (hif->interface == wvif->id)
done = false;
}
spin_unlock_bh(&queue->normal.lock);
spin_lock_bh(&queue->cab.lock);
skb_queue_walk(&queue->cab, item) {
hif = (struct hif_msg *)item->data;
if (hif->interface == wvif->id)
done = false;
}
spin_unlock_bh(&queue->cab.lock);
}
if (!done) {
wfx_tx_unlock(wdev);
msleep(20);
}
} while (!done);
}
static void wfx_tx_queue_clear(struct wfx_dev *wdev, struct wfx_queue *queue,
struct sk_buff_head *gc_list)
{
struct sk_buff *item;
while ((item = skb_dequeue(&queue->normal)) != NULL)
skb_queue_head(gc_list, item);
while ((item = skb_dequeue(&queue->cab)) != NULL)
skb_queue_head(gc_list, item);
}
void wfx_tx_queues_clear(struct wfx_dev *wdev)
{
int i;
struct sk_buff *item;
struct sk_buff_head gc_list;
skb_queue_head_init(&gc_list);
for (i = 0; i < IEEE80211_NUM_ACS; ++i)
wfx_tx_queue_clear(wdev, &wdev->tx_queue[i], &gc_list);
wake_up(&wdev->tx_dequeue);
while ((item = skb_dequeue(&gc_list)) != NULL)
wfx_skb_dtor(wdev, item);
}
void wfx_tx_queues_init(struct wfx_dev *wdev)
{
int i;
memset(wdev->tx_queue, 0, sizeof(wdev->tx_queue));
skb_queue_head_init(&wdev->tx_pending);
init_waitqueue_head(&wdev->tx_dequeue);
for (i = 0; i < IEEE80211_NUM_ACS; ++i) {
skb_queue_head_init(&wdev->tx_queue[i].normal);
skb_queue_head_init(&wdev->tx_queue[i].cab);
}
}
void wfx_tx_queues_deinit(struct wfx_dev *wdev)
{
WARN_ON(!skb_queue_empty(&wdev->tx_pending));
wfx_tx_queues_clear(wdev);
}
void wfx_tx_queues_put(struct wfx_dev *wdev, struct sk_buff *skb)
{
struct wfx_queue *queue = &wdev->tx_queue[skb_get_queue_mapping(skb)];
struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
if (tx_info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM)
skb_queue_tail(&queue->cab, skb);
else
skb_queue_tail(&queue->normal, skb);
}
int wfx_pending_requeue(struct wfx_dev *wdev, struct sk_buff *skb)
{
struct wfx_queue *queue = &wdev->tx_queue[skb_get_queue_mapping(skb)];
WARN_ON(skb_get_queue_mapping(skb) > 3);
WARN_ON(!atomic_read(&queue->pending_frames));
atomic_dec(&queue->pending_frames);
skb_unlink(skb, &wdev->tx_pending);
wfx_tx_queues_put(wdev, skb);
return 0;
}
struct sk_buff *wfx_pending_get(struct wfx_dev *wdev, u32 packet_id)
{
struct wfx_queue *queue;
struct hif_req_tx *req;
struct sk_buff *skb;
spin_lock_bh(&wdev->tx_pending.lock);
skb_queue_walk(&wdev->tx_pending, skb) {
req = wfx_skb_txreq(skb);
if (req->packet_id == packet_id) {
spin_unlock_bh(&wdev->tx_pending.lock);
queue = &wdev->tx_queue[skb_get_queue_mapping(skb)];
WARN_ON(skb_get_queue_mapping(skb) > 3);
WARN_ON(!atomic_read(&queue->pending_frames));
atomic_dec(&queue->pending_frames);
skb_unlink(skb, &wdev->tx_pending);
return skb;
}
}
spin_unlock_bh(&wdev->tx_pending.lock);
WARN(1, "cannot find packet in pending queue");
return NULL;
}
void wfx_pending_dump_old_frames(struct wfx_dev *wdev, unsigned int limit_ms)
{
ktime_t now = ktime_get();
struct wfx_tx_priv *tx_priv;
struct hif_req_tx *req;
struct sk_buff *skb;
bool first = true;
spin_lock_bh(&wdev->tx_pending.lock);
skb_queue_walk(&wdev->tx_pending, skb) {
tx_priv = wfx_skb_tx_priv(skb);
req = wfx_skb_txreq(skb);
if (ktime_after(now, ktime_add_ms(tx_priv->xmit_timestamp,
limit_ms))) {
if (first) {
dev_info(wdev->dev, "frames stuck in firmware since %dms or more:\n",
limit_ms);
first = false;
}
dev_info(wdev->dev, " id %08x sent %lldms ago\n",
req->packet_id,
ktime_ms_delta(now, tx_priv->xmit_timestamp));
}
}
spin_unlock_bh(&wdev->tx_pending.lock);
}
unsigned int wfx_pending_get_pkt_us_delay(struct wfx_dev *wdev,
struct sk_buff *skb)
{
ktime_t now = ktime_get();
struct wfx_tx_priv *tx_priv = wfx_skb_tx_priv(skb);
return ktime_us_delta(now, tx_priv->xmit_timestamp);
}
bool wfx_tx_queues_has_cab(struct wfx_vif *wvif)
{
struct wfx_dev *wdev = wvif->wdev;
int i;
if (wvif->vif->type != NL80211_IFTYPE_AP)
return false;
for (i = 0; i < IEEE80211_NUM_ACS; ++i)
// Note: since only AP can have mcast frames in queue and only
// one vif can be AP, all queued frames has same interface id
if (!skb_queue_empty_lockless(&wdev->tx_queue[i].cab))
return true;
return false;
}
bool wfx_tx_queues_empty(struct wfx_dev *wdev)
{
int i;
for (i = 0; i < IEEE80211_NUM_ACS; i++)
if (!skb_queue_empty_lockless(&wdev->tx_queue[i].normal) ||
!skb_queue_empty_lockless(&wdev->tx_queue[i].cab))
return false;
return true;
}
static bool wfx_handle_tx_data(struct wfx_dev *wdev, struct sk_buff *skb)
{
struct hif_req_tx *req = wfx_skb_txreq(skb);
struct ieee80211_key_conf *hw_key = wfx_skb_tx_priv(skb)->hw_key;
struct ieee80211_hdr *frame =
(struct ieee80211_hdr *)(req->frame + req->data_flags.fc_offset);
struct wfx_vif *wvif =
wdev_to_wvif(wdev, ((struct hif_msg *)skb->data)->interface);
if (!wvif)
return false;
// FIXME: mac80211 is smart enough to handle BSS loss. Driver should not
// try to do anything about that.
if (ieee80211_is_nullfunc(frame->frame_control)) {
mutex_lock(&wvif->bss_loss_lock);
if (wvif->bss_loss_state) {
wvif->bss_loss_confirm_id = req->packet_id;
req->queue_id.queue_id = HIF_QUEUE_ID_VOICE;
}
mutex_unlock(&wvif->bss_loss_lock);
}
// FIXME: identify the exact scenario matched by this condition. Does it
// happen yet?
if (ieee80211_has_protected(frame->frame_control) &&
hw_key && hw_key->keyidx != wvif->wep_default_key_id &&
(hw_key->cipher == WLAN_CIPHER_SUITE_WEP40 ||
hw_key->cipher == WLAN_CIPHER_SUITE_WEP104)) {
wfx_tx_lock(wdev);
WARN_ON(wvif->wep_pending_skb);
wvif->wep_default_key_id = hw_key->keyidx;
wvif->wep_pending_skb = skb;
if (!schedule_work(&wvif->wep_key_work))
wfx_tx_unlock(wdev);
return true;
} else {
return false;
}
}
static struct sk_buff *wfx_tx_queues_get_skb(struct wfx_dev *wdev)
{
struct wfx_queue *sorted_queues[IEEE80211_NUM_ACS];
struct wfx_vif *wvif;
struct hif_msg *hif;
struct sk_buff *skb;
int i, j;
// bubble sort
for (i = 0; i < IEEE80211_NUM_ACS; i++) {
sorted_queues[i] = &wdev->tx_queue[i];
for (j = i; j > 0; j--)
if (atomic_read(&sorted_queues[j]->pending_frames) >
atomic_read(&sorted_queues[j - 1]->pending_frames))
swap(sorted_queues[j - 1], sorted_queues[j]);
}
wvif = NULL;
while ((wvif = wvif_iterate(wdev, wvif)) != NULL) {
if (!wvif->after_dtim_tx_allowed)
continue;
for (i = 0; i < IEEE80211_NUM_ACS; i++) {
skb = skb_dequeue(&sorted_queues[i]->cab);
if (!skb)
continue;
// Note: since only AP can have mcast frames in queue
// and only one vif can be AP, all queued frames has
// same interface id
hif = (struct hif_msg *)skb->data;
WARN_ON(hif->interface != wvif->id);
WARN_ON(sorted_queues[i] !=
&wdev->tx_queue[skb_get_queue_mapping(skb)]);
atomic_inc(&sorted_queues[i]->pending_frames);
return skb;
}
// No more multicast to sent
wvif->after_dtim_tx_allowed = false;
schedule_work(&wvif->update_tim_work);
}
for (i = 0; i < IEEE80211_NUM_ACS; i++) {
skb = skb_dequeue(&sorted_queues[i]->normal);
if (skb) {
WARN_ON(sorted_queues[i] !=
&wdev->tx_queue[skb_get_queue_mapping(skb)]);
atomic_inc(&sorted_queues[i]->pending_frames);
return skb;
}
}
return NULL;
}
struct hif_msg *wfx_tx_queues_get(struct wfx_dev *wdev)
{
struct wfx_tx_priv *tx_priv;
struct sk_buff *skb;
if (atomic_read(&wdev->tx_lock))
return NULL;
for (;;) {
skb = wfx_tx_queues_get_skb(wdev);
if (!skb)
return NULL;
skb_queue_tail(&wdev->tx_pending, skb);
if (wfx_tx_queues_empty(wdev))
wake_up(&wdev->tx_dequeue);
// FIXME: is it useful?
if (wfx_handle_tx_data(wdev, skb))
continue;
tx_priv = wfx_skb_tx_priv(skb);
tx_priv->xmit_timestamp = ktime_get();
return (struct hif_msg *)skb->data;
}
}
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