1 /*
2 * Copyright (c) 2014 Redpine Signals Inc.
3 *
4 * Permission to use, copy, modify, and/or distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
7 *
8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15 */
16
17 #include "rsi_mgmt.h"
18 #include "rsi_common.h"
19 #include "rsi_hal.h"
20 #include "rsi_coex.h"
21
22 /**
23 * rsi_determine_min_weight_queue() - This function determines the queue with
24 * the min weight.
25 * @common: Pointer to the driver private structure.
26 *
27 * Return: q_num: Corresponding queue number.
28 */
rsi_determine_min_weight_queue(struct rsi_common * common)29 static u8 rsi_determine_min_weight_queue(struct rsi_common *common)
30 {
31 struct wmm_qinfo *tx_qinfo = common->tx_qinfo;
32 u32 q_len = 0;
33 u8 ii = 0;
34
35 for (ii = 0; ii < NUM_EDCA_QUEUES; ii++) {
36 q_len = skb_queue_len(&common->tx_queue[ii]);
37 if ((tx_qinfo[ii].pkt_contended) && q_len) {
38 common->min_weight = tx_qinfo[ii].weight;
39 break;
40 }
41 }
42 return ii;
43 }
44
45 /**
46 * rsi_recalculate_weights() - This function recalculates the weights
47 * corresponding to each queue.
48 * @common: Pointer to the driver private structure.
49 *
50 * Return: recontend_queue bool variable
51 */
rsi_recalculate_weights(struct rsi_common * common)52 static bool rsi_recalculate_weights(struct rsi_common *common)
53 {
54 struct wmm_qinfo *tx_qinfo = common->tx_qinfo;
55 bool recontend_queue = false;
56 u8 ii = 0;
57 u32 q_len = 0;
58
59 for (ii = 0; ii < NUM_EDCA_QUEUES; ii++) {
60 q_len = skb_queue_len(&common->tx_queue[ii]);
61 /* Check for the need of contention */
62 if (q_len) {
63 if (tx_qinfo[ii].pkt_contended) {
64 tx_qinfo[ii].weight =
65 ((tx_qinfo[ii].weight > common->min_weight) ?
66 tx_qinfo[ii].weight - common->min_weight : 0);
67 } else {
68 tx_qinfo[ii].pkt_contended = 1;
69 tx_qinfo[ii].weight = tx_qinfo[ii].wme_params;
70 recontend_queue = true;
71 }
72 } else { /* No packets so no contention */
73 tx_qinfo[ii].weight = 0;
74 tx_qinfo[ii].pkt_contended = 0;
75 }
76 }
77
78 return recontend_queue;
79 }
80
81 /**
82 * rsi_get_num_pkts_dequeue() - This function determines the number of
83 * packets to be dequeued based on the number
84 * of bytes calculated using txop.
85 *
86 * @common: Pointer to the driver private structure.
87 * @q_num: the queue from which pkts have to be dequeued
88 *
89 * Return: pkt_num: Number of pkts to be dequeued.
90 */
rsi_get_num_pkts_dequeue(struct rsi_common * common,u8 q_num)91 static u32 rsi_get_num_pkts_dequeue(struct rsi_common *common, u8 q_num)
92 {
93 struct rsi_hw *adapter = common->priv;
94 struct sk_buff *skb;
95 u32 pkt_cnt = 0;
96 s16 txop = common->tx_qinfo[q_num].txop * 32;
97 __le16 r_txop;
98 struct ieee80211_rate rate;
99 struct ieee80211_hdr *wh;
100 struct ieee80211_vif *vif;
101
102 rate.bitrate = RSI_RATE_MCS0 * 5 * 10; /* Convert to Kbps */
103 if (q_num == VI_Q)
104 txop = ((txop << 5) / 80);
105
106 if (skb_queue_len(&common->tx_queue[q_num]))
107 skb = skb_peek(&common->tx_queue[q_num]);
108 else
109 return 0;
110
111 do {
112 wh = (struct ieee80211_hdr *)skb->data;
113 vif = rsi_get_vif(adapter, wh->addr2);
114 r_txop = ieee80211_generic_frame_duration(adapter->hw,
115 vif,
116 common->band,
117 skb->len, &rate);
118 txop -= le16_to_cpu(r_txop);
119 pkt_cnt += 1;
120 /*checking if pkts are still there*/
121 if (skb_queue_len(&common->tx_queue[q_num]) - pkt_cnt)
122 skb = skb->next;
123 else
124 break;
125
126 } while (txop > 0);
127
128 return pkt_cnt;
129 }
130
131 /**
132 * rsi_core_determine_hal_queue() - This function determines the queue from
133 * which packet has to be dequeued.
134 * @common: Pointer to the driver private structure.
135 *
136 * Return: q_num: Corresponding queue number on success.
137 */
rsi_core_determine_hal_queue(struct rsi_common * common)138 static u8 rsi_core_determine_hal_queue(struct rsi_common *common)
139 {
140 bool recontend_queue = false;
141 u32 q_len = 0;
142 u8 q_num = INVALID_QUEUE;
143 u8 ii = 0;
144
145 if (skb_queue_len(&common->tx_queue[MGMT_BEACON_Q])) {
146 q_num = MGMT_BEACON_Q;
147 return q_num;
148 }
149 if (skb_queue_len(&common->tx_queue[MGMT_SOFT_Q])) {
150 if (!common->mgmt_q_block)
151 q_num = MGMT_SOFT_Q;
152 return q_num;
153 }
154
155 if (common->hw_data_qs_blocked)
156 return q_num;
157
158 if (common->pkt_cnt != 0) {
159 --common->pkt_cnt;
160 return common->selected_qnum;
161 }
162
163 get_queue_num:
164 recontend_queue = false;
165
166 q_num = rsi_determine_min_weight_queue(common);
167
168 ii = q_num;
169
170 /* Selecting the queue with least back off */
171 for (; ii < NUM_EDCA_QUEUES; ii++) {
172 q_len = skb_queue_len(&common->tx_queue[ii]);
173 if (((common->tx_qinfo[ii].pkt_contended) &&
174 (common->tx_qinfo[ii].weight < common->min_weight)) &&
175 q_len) {
176 common->min_weight = common->tx_qinfo[ii].weight;
177 q_num = ii;
178 }
179 }
180
181 if (q_num < NUM_EDCA_QUEUES)
182 common->tx_qinfo[q_num].pkt_contended = 0;
183
184 /* Adjust the back off values for all queues again */
185 recontend_queue = rsi_recalculate_weights(common);
186
187 q_len = skb_queue_len(&common->tx_queue[q_num]);
188 if (!q_len) {
189 /* If any queues are freshly contended and the selected queue
190 * doesn't have any packets
191 * then get the queue number again with fresh values
192 */
193 if (recontend_queue)
194 goto get_queue_num;
195
196 return INVALID_QUEUE;
197 }
198
199 common->selected_qnum = q_num;
200 q_len = skb_queue_len(&common->tx_queue[q_num]);
201
202 if (q_num == VO_Q || q_num == VI_Q) {
203 common->pkt_cnt = rsi_get_num_pkts_dequeue(common, q_num);
204 common->pkt_cnt -= 1;
205 }
206
207 return q_num;
208 }
209
210 /**
211 * rsi_core_queue_pkt() - This functions enqueues the packet to the queue
212 * specified by the queue number.
213 * @common: Pointer to the driver private structure.
214 * @skb: Pointer to the socket buffer structure.
215 *
216 * Return: None.
217 */
rsi_core_queue_pkt(struct rsi_common * common,struct sk_buff * skb)218 static void rsi_core_queue_pkt(struct rsi_common *common,
219 struct sk_buff *skb)
220 {
221 u8 q_num = skb->priority;
222 if (q_num >= NUM_SOFT_QUEUES) {
223 rsi_dbg(ERR_ZONE, "%s: Invalid Queue Number: q_num = %d\n",
224 __func__, q_num);
225 dev_kfree_skb(skb);
226 return;
227 }
228
229 skb_queue_tail(&common->tx_queue[q_num], skb);
230 }
231
232 /**
233 * rsi_core_dequeue_pkt() - This functions dequeues the packet from the queue
234 * specified by the queue number.
235 * @common: Pointer to the driver private structure.
236 * @q_num: Queue number.
237 *
238 * Return: Pointer to sk_buff structure.
239 */
rsi_core_dequeue_pkt(struct rsi_common * common,u8 q_num)240 static struct sk_buff *rsi_core_dequeue_pkt(struct rsi_common *common,
241 u8 q_num)
242 {
243 if (q_num >= NUM_SOFT_QUEUES) {
244 rsi_dbg(ERR_ZONE, "%s: Invalid Queue Number: q_num = %d\n",
245 __func__, q_num);
246 return NULL;
247 }
248
249 return skb_dequeue(&common->tx_queue[q_num]);
250 }
251
252 /**
253 * rsi_core_qos_processor() - This function is used to determine the wmm queue
254 * based on the backoff procedure. Data packets are
255 * dequeued from the selected hal queue and sent to
256 * the below layers.
257 * @common: Pointer to the driver private structure.
258 *
259 * Return: None.
260 */
rsi_core_qos_processor(struct rsi_common * common)261 void rsi_core_qos_processor(struct rsi_common *common)
262 {
263 struct rsi_hw *adapter = common->priv;
264 struct sk_buff *skb;
265 unsigned long tstamp_1, tstamp_2;
266 u8 q_num;
267 int status;
268
269 tstamp_1 = jiffies;
270 while (1) {
271 q_num = rsi_core_determine_hal_queue(common);
272 rsi_dbg(DATA_TX_ZONE,
273 "%s: Queue number = %d\n", __func__, q_num);
274
275 if (q_num == INVALID_QUEUE) {
276 rsi_dbg(DATA_TX_ZONE, "%s: No More Pkt\n", __func__);
277 break;
278 }
279 if (common->hibernate_resume)
280 break;
281
282 mutex_lock(&common->tx_lock);
283
284 status = adapter->check_hw_queue_status(adapter, q_num);
285 if ((status <= 0)) {
286 mutex_unlock(&common->tx_lock);
287 break;
288 }
289
290 if ((q_num < MGMT_SOFT_Q) &&
291 ((skb_queue_len(&common->tx_queue[q_num])) <=
292 MIN_DATA_QUEUE_WATER_MARK)) {
293 if (ieee80211_queue_stopped(adapter->hw, WME_AC(q_num)))
294 ieee80211_wake_queue(adapter->hw,
295 WME_AC(q_num));
296 }
297
298 skb = rsi_core_dequeue_pkt(common, q_num);
299 if (skb == NULL) {
300 rsi_dbg(ERR_ZONE, "skb null\n");
301 mutex_unlock(&common->tx_lock);
302 break;
303 }
304 if (q_num == MGMT_BEACON_Q) {
305 status = rsi_send_pkt_to_bus(common, skb);
306 dev_kfree_skb(skb);
307 } else {
308 #ifdef CONFIG_RSI_COEX
309 if (common->coex_mode > 1) {
310 status = rsi_coex_send_pkt(common, skb,
311 RSI_WLAN_Q);
312 } else {
313 #endif
314 if (q_num == MGMT_SOFT_Q)
315 status = rsi_send_mgmt_pkt(common, skb);
316 else
317 status = rsi_send_data_pkt(common, skb);
318 #ifdef CONFIG_RSI_COEX
319 }
320 #endif
321 }
322
323 if (status) {
324 mutex_unlock(&common->tx_lock);
325 break;
326 }
327
328 common->tx_stats.total_tx_pkt_send[q_num]++;
329
330 tstamp_2 = jiffies;
331 mutex_unlock(&common->tx_lock);
332
333 if (time_after(tstamp_2, tstamp_1 + (300 * HZ) / 1000))
334 schedule();
335 }
336 }
337
rsi_find_sta(struct rsi_common * common,u8 * mac_addr)338 struct rsi_sta *rsi_find_sta(struct rsi_common *common, u8 *mac_addr)
339 {
340 int i;
341
342 for (i = 0; i < common->max_stations; i++) {
343 if (!common->stations[i].sta)
344 continue;
345 if (!(memcmp(common->stations[i].sta->addr,
346 mac_addr, ETH_ALEN)))
347 return &common->stations[i];
348 }
349 return NULL;
350 }
351
rsi_get_vif(struct rsi_hw * adapter,u8 * mac)352 struct ieee80211_vif *rsi_get_vif(struct rsi_hw *adapter, u8 *mac)
353 {
354 struct ieee80211_vif *vif;
355 int i;
356
357 for (i = 0; i < RSI_MAX_VIFS; i++) {
358 vif = adapter->vifs[i];
359 if (!vif)
360 continue;
361 if (!memcmp(vif->addr, mac, ETH_ALEN))
362 return vif;
363 }
364 return NULL;
365 }
366
367 /**
368 * rsi_core_xmit() - This function transmits the packets received from mac80211
369 * @common: Pointer to the driver private structure.
370 * @skb: Pointer to the socket buffer structure.
371 *
372 * Return: None.
373 */
rsi_core_xmit(struct rsi_common * common,struct sk_buff * skb)374 void rsi_core_xmit(struct rsi_common *common, struct sk_buff *skb)
375 {
376 struct rsi_hw *adapter = common->priv;
377 struct ieee80211_tx_info *info;
378 struct skb_info *tx_params;
379 struct ieee80211_hdr *wh = NULL;
380 struct ieee80211_vif *vif;
381 u8 q_num, tid = 0;
382 struct rsi_sta *rsta = NULL;
383
384 if ((!skb) || (!skb->len)) {
385 rsi_dbg(ERR_ZONE, "%s: Null skb/zero Length packet\n",
386 __func__);
387 goto xmit_fail;
388 }
389 if (common->fsm_state != FSM_MAC_INIT_DONE) {
390 rsi_dbg(ERR_ZONE, "%s: FSM state not open\n", __func__);
391 goto xmit_fail;
392 }
393 if (common->wow_flags & RSI_WOW_ENABLED) {
394 rsi_dbg(ERR_ZONE,
395 "%s: Blocking Tx_packets when WOWLAN is enabled\n",
396 __func__);
397 goto xmit_fail;
398 }
399
400 info = IEEE80211_SKB_CB(skb);
401 tx_params = (struct skb_info *)info->driver_data;
402 /* info->driver_data and info->control part of union so make copy */
403 tx_params->have_key = !!info->control.hw_key;
404 wh = (struct ieee80211_hdr *)&skb->data[0];
405 tx_params->sta_id = 0;
406
407 vif = rsi_get_vif(adapter, wh->addr2);
408 if (!vif)
409 goto xmit_fail;
410 tx_params->vif = vif;
411 tx_params->vap_id = ((struct vif_priv *)vif->drv_priv)->vap_id;
412 if ((ieee80211_is_mgmt(wh->frame_control)) ||
413 (ieee80211_is_ctl(wh->frame_control)) ||
414 (ieee80211_is_qos_nullfunc(wh->frame_control))) {
415 if (ieee80211_is_assoc_req(wh->frame_control) ||
416 ieee80211_is_reassoc_req(wh->frame_control)) {
417 struct ieee80211_bss_conf *bss = &vif->bss_conf;
418
419 common->eapol4_confirm = false;
420 rsi_hal_send_sta_notify_frame(common,
421 RSI_IFTYPE_STATION,
422 STA_CONNECTED, bss->bssid,
423 bss->qos, vif->cfg.aid,
424 0,
425 vif);
426 }
427
428 q_num = MGMT_SOFT_Q;
429 skb->priority = q_num;
430
431 if (rsi_prepare_mgmt_desc(common, skb)) {
432 rsi_dbg(ERR_ZONE, "Failed to prepare desc\n");
433 goto xmit_fail;
434 }
435 } else {
436 if (ieee80211_is_data_qos(wh->frame_control)) {
437 u8 *qos = ieee80211_get_qos_ctl(wh);
438
439 tid = *qos & IEEE80211_QOS_CTL_TID_MASK;
440 skb->priority = TID_TO_WME_AC(tid);
441 } else {
442 tid = IEEE80211_NONQOS_TID;
443 skb->priority = BE_Q;
444 }
445
446 q_num = skb->priority;
447 tx_params->tid = tid;
448
449 if (((vif->type == NL80211_IFTYPE_AP) ||
450 (vif->type == NL80211_IFTYPE_P2P_GO)) &&
451 (!is_broadcast_ether_addr(wh->addr1)) &&
452 (!is_multicast_ether_addr(wh->addr1))) {
453 rsta = rsi_find_sta(common, wh->addr1);
454 if (!rsta)
455 goto xmit_fail;
456 tx_params->sta_id = rsta->sta_id;
457 } else {
458 tx_params->sta_id = 0;
459 }
460
461 if (rsta) {
462 /* Start aggregation if not done for this tid */
463 if (!rsta->start_tx_aggr[tid]) {
464 rsta->start_tx_aggr[tid] = true;
465 ieee80211_start_tx_ba_session(rsta->sta,
466 tid, 0);
467 }
468 }
469
470 if (IEEE80211_SKB_CB(skb)->control.flags &
471 IEEE80211_TX_CTRL_PORT_CTRL_PROTO) {
472 q_num = MGMT_SOFT_Q;
473 skb->priority = q_num;
474 }
475 if (rsi_prepare_data_desc(common, skb)) {
476 rsi_dbg(ERR_ZONE, "Failed to prepare data desc\n");
477 goto xmit_fail;
478 }
479 }
480
481 if ((q_num < MGMT_SOFT_Q) &&
482 ((skb_queue_len(&common->tx_queue[q_num]) + 1) >=
483 DATA_QUEUE_WATER_MARK)) {
484 rsi_dbg(ERR_ZONE, "%s: sw queue full\n", __func__);
485 if (!ieee80211_queue_stopped(adapter->hw, WME_AC(q_num)))
486 ieee80211_stop_queue(adapter->hw, WME_AC(q_num));
487 rsi_set_event(&common->tx_thread.event);
488 goto xmit_fail;
489 }
490
491 rsi_core_queue_pkt(common, skb);
492 rsi_dbg(DATA_TX_ZONE, "%s: ===> Scheduling TX thread <===\n", __func__);
493 rsi_set_event(&common->tx_thread.event);
494
495 return;
496
497 xmit_fail:
498 rsi_dbg(ERR_ZONE, "%s: Failed to queue packet\n", __func__);
499 /* Dropping pkt here */
500 ieee80211_free_txskb(common->priv->hw, skb);
501 }
502