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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"
#include "traces.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;
// Do not wait for any reply if chip is frozen
if (wdev->chip_frozen)
return;
wfx_tx_lock(wdev);
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) {
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 = true;
}
mutex_unlock(&wdev->hif_cmd.lock);
wfx_tx_unlock(wdev);
}
void wfx_tx_lock_flush(struct wfx_dev *wdev)
{
wfx_tx_lock(wdev);
wfx_tx_flush(wdev);
}
void wfx_tx_queues_init(struct wfx_vif *wvif)
{
int i;
for (i = 0; i < IEEE80211_NUM_ACS; ++i) {
skb_queue_head_init(&wvif->tx_queue[i].normal);
skb_queue_head_init(&wvif->tx_queue[i].cab);
}
}
void wfx_tx_queues_check_empty(struct wfx_vif *wvif)
{
int i;
for (i = 0; i < IEEE80211_NUM_ACS; ++i) {
WARN_ON(atomic_read(&wvif->tx_queue[i].pending_frames));
WARN_ON(!skb_queue_empty_lockless(&wvif->tx_queue[i].normal));
WARN_ON(!skb_queue_empty_lockless(&wvif->tx_queue[i].cab));
}
}
bool wfx_tx_queue_empty(struct wfx_vif *wvif, struct wfx_queue *queue)
{
return skb_queue_empty(&queue->normal) && skb_queue_empty(&queue->cab);
}
static void __wfx_tx_queue_drop(struct wfx_vif *wvif,
struct sk_buff_head *skb_queue,
struct sk_buff_head *dropped)
{
struct sk_buff *skb, *tmp;
spin_lock_bh(&skb_queue->lock);
skb_queue_walk_safe(skb_queue, skb, tmp) {
__skb_unlink(skb, skb_queue);
skb_queue_head(dropped, skb);
}
spin_unlock_bh(&skb_queue->lock);
}
void wfx_tx_queue_drop(struct wfx_vif *wvif, struct wfx_queue *queue,
struct sk_buff_head *dropped)
{
__wfx_tx_queue_drop(wvif, &queue->cab, dropped);
__wfx_tx_queue_drop(wvif, &queue->normal, dropped);
wake_up(&wvif->wdev->tx_dequeue);
}
void wfx_tx_queues_put(struct wfx_vif *wvif, struct sk_buff *skb)
{
struct wfx_queue *queue = &wvif->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);
}
void wfx_pending_drop(struct wfx_dev *wdev, struct sk_buff_head *dropped)
{
struct wfx_queue *queue;
struct wfx_vif *wvif;
struct hif_msg *hif;
struct sk_buff *skb;
WARN(!wdev->chip_frozen, "%s should only be used to recover a frozen device",
__func__);
while ((skb = skb_dequeue(&wdev->tx_pending)) != NULL) {
hif = (struct hif_msg *)skb->data;
wvif = wdev_to_wvif(wdev, hif->interface);
if (wvif) {
queue = &wvif->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_queue_head(dropped, skb);
}
}
struct sk_buff *wfx_pending_get(struct wfx_dev *wdev, u32 packet_id)
{
struct wfx_queue *queue;
struct hif_req_tx *req;
struct wfx_vif *wvif;
struct hif_msg *hif;
struct sk_buff *skb;
spin_lock_bh(&wdev->tx_pending.lock);
skb_queue_walk(&wdev->tx_pending, skb) {
hif = (struct hif_msg *)skb->data;
req = (struct hif_req_tx *)hif->body;
if (req->packet_id != packet_id)
continue;
spin_unlock_bh(&wdev->tx_pending.lock);
wvif = wdev_to_wvif(wdev, hif->interface);
if (wvif) {
queue = &wvif->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)
{
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(&wvif->tx_queue[i].cab))
return true;
return false;
}
static struct sk_buff *wfx_tx_queues_get_skb(struct wfx_dev *wdev)
{
struct wfx_queue *queues[IEEE80211_NUM_ACS * ARRAY_SIZE(wdev->vif)];
int i, j, num_queues = 0;
struct wfx_vif *wvif;
struct hif_msg *hif;
struct sk_buff *skb;
// sort the queues
wvif = NULL;
while ((wvif = wvif_iterate(wdev, wvif)) != NULL) {
for (i = 0; i < IEEE80211_NUM_ACS; i++) {
WARN_ON(num_queues >= ARRAY_SIZE(queues));
queues[num_queues] = &wvif->tx_queue[i];
for (j = num_queues; j > 0; j--)
if (atomic_read(&queues[j]->pending_frames) <
atomic_read(&queues[j - 1]->pending_frames))
swap(queues[j - 1], queues[j]);
num_queues++;
}
}
wvif = NULL;
while ((wvif = wvif_iterate(wdev, wvif)) !=
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