diff options
Diffstat (limited to 'drivers/net/wireless/silabs/wfx/queue.c')
-rw-r--r-- | drivers/net/wireless/silabs/wfx/queue.c | 298 |
1 files changed, 298 insertions, 0 deletions
diff --git a/drivers/net/wireless/silabs/wfx/queue.c b/drivers/net/wireless/silabs/wfx/queue.c new file mode 100644 index 0000000000..37f492e5d3 --- /dev/null +++ b/drivers/net/wireless/silabs/wfx/queue.c @@ -0,0 +1,298 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Queue between the tx operation and the bh workqueue. + * + * Copyright (c) 2017-2020, 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) +{ + /* The device is in charge to respect the details of the QoS parameters. The driver just + * ensure that it roughtly respect the priorities to avoid any shortage. + */ + const int priorities[IEEE80211_NUM_ACS] = { 1, 2, 64, 128 }; + 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); + wvif->tx_queue[i].priority = priorities[i]; + } +} + +bool wfx_tx_queue_empty(struct wfx_vif *wvif, struct wfx_queue *queue) +{ + return skb_queue_empty_lockless(&queue->normal) && skb_queue_empty_lockless(&queue->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(!wfx_tx_queue_empty(wvif, &wvif->tx_queue[i])); + } +} + +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 wfx_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 wfx_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 wfx_hif_req_tx *req; + struct wfx_vif *wvif; + struct wfx_hif_msg *hif; + struct sk_buff *skb; + + spin_lock_bh(&wdev->tx_pending.lock); + skb_queue_walk(&wdev->tx_pending, skb) { + hif = (struct wfx_hif_msg *)skb->data; + req = (struct wfx_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 wfx_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 ieee80211_vif *vif = wvif_to_vif(wvif); + int i; + + if (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 int wfx_tx_queue_get_weight(struct wfx_queue *queue) +{ + return atomic_read(&queue->pending_frames) * queue->priority; +} + +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 wfx_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 (wfx_tx_queue_get_weight(queues[j]) < + wfx_tx_queue_get_weight(queues[j - 1])) + swap(queues[j - 1], queues[j]); + num_queues++; + } + } + + wvif = NULL; + while ((wvif = wvif_iterate(wdev, wvif)) != NULL) { + if (!wvif->after_dtim_tx_allowed) + continue; + for (i = 0; i < num_queues; i++) { + skb = skb_dequeue(&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 wfx_hif_msg *)skb->data; + WARN_ON(hif->interface != wvif->id); + WARN_ON(queues[i] != &wvif->tx_queue[skb_get_queue_mapping(skb)]); + atomic_inc(&queues[i]->pending_frames); + trace_queues_stats(wdev, queues[i]); + return skb; + } + /* No more multicast to sent */ + wvif->after_dtim_tx_allowed = false; + schedule_work(&wvif->update_tim_work); + } + + for (i = 0; i < num_queues; i++) { + skb = skb_dequeue(&queues[i]->normal); + if (skb) { + atomic_inc(&queues[i]->pending_frames); + trace_queues_stats(wdev, queues[i]); + return skb; + } + } + return NULL; +} + +struct wfx_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; + skb = wfx_tx_queues_get_skb(wdev); + if (!skb) + return NULL; + skb_queue_tail(&wdev->tx_pending, skb); + wake_up(&wdev->tx_dequeue); + tx_priv = wfx_skb_tx_priv(skb); + tx_priv->xmit_timestamp = ktime_get(); + return (struct wfx_hif_msg *)skb->data; +} |