1// SPDX-License-Identifier: GPL-2.0-only 2/* 3 * Queue between the tx operation and the bh workqueue. 4 * 5 * Copyright (c) 2017-2020, Silicon Laboratories, Inc. 6 * Copyright (c) 2010, ST-Ericsson 7 */ 8#include <linux/sched.h> 9#include <net/mac80211.h> 10 11#include "queue.h" 12#include "wfx.h" 13#include "sta.h" 14#include "data_tx.h" 15#include "traces.h" 16 17void wfx_tx_lock(struct wfx_dev *wdev) 18{ 19 atomic_inc(&wdev->tx_lock); 20} 21 22void wfx_tx_unlock(struct wfx_dev *wdev) 23{ 24 int tx_lock = atomic_dec_return(&wdev->tx_lock); 25 26 WARN(tx_lock < 0, "inconsistent tx_lock value"); 27 if (!tx_lock) 28 wfx_bh_request_tx(wdev); 29} 30 31void wfx_tx_flush(struct wfx_dev *wdev) 32{ 33 int ret; 34 35 /* Do not wait for any reply if chip is frozen */ 36 if (wdev->chip_frozen) 37 return; 38 39 wfx_tx_lock(wdev); 40 mutex_lock(&wdev->hif_cmd.lock); 41 ret = wait_event_timeout(wdev->hif.tx_buffers_empty, !wdev->hif.tx_buffers_used, 42 msecs_to_jiffies(3000)); 43 if (!ret) { 44 dev_warn(wdev->dev, "cannot flush tx buffers (%d still busy)\n", 45 wdev->hif.tx_buffers_used); 46 wfx_pending_dump_old_frames(wdev, 3000); 47 /* FIXME: drop pending frames here */ 48 wdev->chip_frozen = true; 49 } 50 mutex_unlock(&wdev->hif_cmd.lock); 51 wfx_tx_unlock(wdev); 52} 53 54void wfx_tx_lock_flush(struct wfx_dev *wdev) 55{ 56 wfx_tx_lock(wdev); 57 wfx_tx_flush(wdev); 58} 59 60void wfx_tx_queues_init(struct wfx_vif *wvif) 61{ 62 /* The device is in charge to respect the details of the QoS parameters. The driver just 63 * ensure that it roughtly respect the priorities to avoid any shortage. 64 */ 65 const int priorities[IEEE80211_NUM_ACS] = { 1, 2, 64, 128 }; 66 int i; 67 68 for (i = 0; i < IEEE80211_NUM_ACS; ++i) { 69 skb_queue_head_init(&wvif->tx_queue[i].normal); 70 skb_queue_head_init(&wvif->tx_queue[i].cab); 71 wvif->tx_queue[i].priority = priorities[i]; 72 } 73} 74 75bool wfx_tx_queue_empty(struct wfx_vif *wvif, struct wfx_queue *queue) 76{ 77 return skb_queue_empty_lockless(&queue->normal) && skb_queue_empty_lockless(&queue->cab); 78} 79 80void wfx_tx_queues_check_empty(struct wfx_vif *wvif) 81{ 82 int i; 83 84 for (i = 0; i < IEEE80211_NUM_ACS; ++i) { 85 WARN_ON(atomic_read(&wvif->tx_queue[i].pending_frames)); 86 WARN_ON(!wfx_tx_queue_empty(wvif, &wvif->tx_queue[i])); 87 } 88} 89 90static void __wfx_tx_queue_drop(struct wfx_vif *wvif, 91 struct sk_buff_head *skb_queue, struct sk_buff_head *dropped) 92{ 93 struct sk_buff *skb, *tmp; 94 95 spin_lock_bh(&skb_queue->lock); 96 skb_queue_walk_safe(skb_queue, skb, tmp) { 97 __skb_unlink(skb, skb_queue); 98 skb_queue_head(dropped, skb); 99 } 100 spin_unlock_bh(&skb_queue->lock); 101} 102 103void wfx_tx_queue_drop(struct wfx_vif *wvif, struct wfx_queue *queue, 104 struct sk_buff_head *dropped) 105{ 106 __wfx_tx_queue_drop(wvif, &queue->cab, dropped); 107 __wfx_tx_queue_drop(wvif, &queue->normal, dropped); 108 wake_up(&wvif->wdev->tx_dequeue); 109} 110 111void wfx_tx_queues_put(struct wfx_vif *wvif, struct sk_buff *skb) 112{ 113 struct wfx_queue *queue = &wvif->tx_queue[skb_get_queue_mapping(skb)]; 114 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb); 115 116 if (tx_info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) 117 skb_queue_tail(&queue->cab, skb); 118 else 119 skb_queue_tail(&queue->normal, skb); 120} 121 122void wfx_pending_drop(struct wfx_dev *wdev, struct sk_buff_head *dropped) 123{ 124 struct wfx_queue *queue; 125 struct wfx_vif *wvif; 126 struct wfx_hif_msg *hif; 127 struct sk_buff *skb; 128 129 WARN(!wdev->chip_frozen, "%s should only be used to recover a frozen device", __func__); 130 while ((skb = skb_dequeue(&wdev->tx_pending)) != NULL) { 131 hif = (struct wfx_hif_msg *)skb->data; 132 wvif = wdev_to_wvif(wdev, hif->interface); 133 if (wvif) { 134 queue = &wvif->tx_queue[skb_get_queue_mapping(skb)]; 135 WARN_ON(skb_get_queue_mapping(skb) > 3); 136 WARN_ON(!atomic_read(&queue->pending_frames)); 137 atomic_dec(&queue->pending_frames); 138 } 139 skb_queue_head(dropped, skb); 140 } 141} 142 143struct sk_buff *wfx_pending_get(struct wfx_dev *wdev, u32 packet_id) 144{ 145 struct wfx_queue *queue; 146 struct wfx_hif_req_tx *req; 147 struct wfx_vif *wvif; 148 struct wfx_hif_msg *hif; 149 struct sk_buff *skb; 150 151 spin_lock_bh(&wdev->tx_pending.lock); 152 skb_queue_walk(&wdev->tx_pending, skb) { 153 hif = (struct wfx_hif_msg *)skb->data; 154 req = (struct wfx_hif_req_tx *)hif->body; 155 if (req->packet_id != packet_id) 156 continue; 157 spin_unlock_bh(&wdev->tx_pending.lock); 158 wvif = wdev_to_wvif(wdev, hif->interface); 159 if (wvif) { 160 queue = &wvif->tx_queue[skb_get_queue_mapping(skb)]; 161 WARN_ON(skb_get_queue_mapping(skb) > 3); 162 WARN_ON(!atomic_read(&queue->pending_frames)); 163 atomic_dec(&queue->pending_frames); 164 } 165 skb_unlink(skb, &wdev->tx_pending); 166 return skb; 167 } 168 spin_unlock_bh(&wdev->tx_pending.lock); 169 WARN(1, "cannot find packet in pending queue"); 170 return NULL; 171} 172 173void wfx_pending_dump_old_frames(struct wfx_dev *wdev, unsigned int limit_ms) 174{ 175 ktime_t now = ktime_get(); 176 struct wfx_tx_priv *tx_priv; 177 struct wfx_hif_req_tx *req; 178 struct sk_buff *skb; 179 bool first = true; 180 181 spin_lock_bh(&wdev->tx_pending.lock); 182 skb_queue_walk(&wdev->tx_pending, skb) { 183 tx_priv = wfx_skb_tx_priv(skb); 184 req = wfx_skb_txreq(skb); 185 if (ktime_after(now, ktime_add_ms(tx_priv->xmit_timestamp, limit_ms))) { 186 if (first) { 187 dev_info(wdev->dev, "frames stuck in firmware since %dms or more:\n", 188 limit_ms); 189 first = false; 190 } 191 dev_info(wdev->dev, " id %08x sent %lldms ago\n", 192 req->packet_id, ktime_ms_delta(now, tx_priv->xmit_timestamp)); 193 } 194 } 195 spin_unlock_bh(&wdev->tx_pending.lock); 196} 197 198unsigned int wfx_pending_get_pkt_us_delay(struct wfx_dev *wdev, struct sk_buff *skb) 199{ 200 ktime_t now = ktime_get(); 201 struct wfx_tx_priv *tx_priv = wfx_skb_tx_priv(skb); 202 203 return ktime_us_delta(now, tx_priv->xmit_timestamp); 204} 205 206bool wfx_tx_queues_has_cab(struct wfx_vif *wvif) 207{ 208 struct ieee80211_vif *vif = wvif_to_vif(wvif); 209 int i; 210 211 if (vif->type != NL80211_IFTYPE_AP) 212 return false; 213 for (i = 0; i < IEEE80211_NUM_ACS; ++i) 214 /* Note: since only AP can have mcast frames in queue and only one vif can be AP, 215 * all queued frames has same interface id 216 */ 217 if (!skb_queue_empty_lockless(&wvif->tx_queue[i].cab)) 218 return true; 219 return false; 220} 221 222static int wfx_tx_queue_get_weight(struct wfx_queue *queue) 223{ 224 return atomic_read(&queue->pending_frames) * queue->priority; 225} 226 227static struct sk_buff *wfx_tx_queues_get_skb(struct wfx_dev *wdev) 228{ 229 struct wfx_queue *queues[IEEE80211_NUM_ACS * ARRAY_SIZE(wdev->vif)]; 230 int i, j, num_queues = 0; 231 struct wfx_vif *wvif; 232 struct wfx_hif_msg *hif; 233 struct sk_buff *skb; 234 235 /* sort the queues */ 236 wvif = NULL; 237 while ((wvif = wvif_iterate(wdev, wvif)) != NULL) { 238 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 239 WARN_ON(num_queues >= ARRAY_SIZE(queues)); 240 queues[num_queues] = &wvif->tx_queue[i]; 241 for (j = num_queues; j > 0; j--) 242 if (wfx_tx_queue_get_weight(queues[j]) < 243 wfx_tx_queue_get_weight(queues[j - 1])) 244 swap(queues[j - 1], queues[j]); 245 num_queues++; 246 } 247 } 248 249 wvif = NULL; 250 while ((wvif = wvif_iterate(wdev, wvif)) != NULL) { 251 if (!wvif->after_dtim_tx_allowed) 252 continue; 253 for (i = 0; i < num_queues; i++) { 254 skb = skb_dequeue(&queues[i]->cab); 255 if (!skb) 256 continue; 257 /* Note: since only AP can have mcast frames in queue and only one vif can 258 * be AP, all queued frames has same interface id 259 */ 260 hif = (struct wfx_hif_msg *)skb->data; 261 WARN_ON(hif->interface != wvif->id); 262 WARN_ON(queues[i] != &wvif->tx_queue[skb_get_queue_mapping(skb)]); 263 atomic_inc(&queues[i]->pending_frames); 264 trace_queues_stats(wdev, queues[i]); 265 return skb; 266 } 267 /* No more multicast to sent */ 268 wvif->after_dtim_tx_allowed = false; 269 schedule_work(&wvif->update_tim_work); 270 } 271 272 for (i = 0; i < num_queues; i++) { 273 skb = skb_dequeue(&queues[i]->normal); 274 if (skb) { 275 atomic_inc(&queues[i]->pending_frames); 276 trace_queues_stats(wdev, queues[i]); 277 return skb; 278 } 279 } 280 return NULL; 281} 282 283struct wfx_hif_msg *wfx_tx_queues_get(struct wfx_dev *wdev) 284{ 285 struct wfx_tx_priv *tx_priv; 286 struct sk_buff *skb; 287 288 if (atomic_read(&wdev->tx_lock)) 289 return NULL; 290 skb = wfx_tx_queues_get_skb(wdev); 291 if (!skb) 292 return NULL; 293 skb_queue_tail(&wdev->tx_pending, skb); 294 wake_up(&wdev->tx_dequeue); 295 tx_priv = wfx_skb_tx_priv(skb); 296 tx_priv->xmit_timestamp = ktime_get(); 297 return (struct wfx_hif_msg *)skb->data; 298} 299