2 * Copyright (c) 2014 Redpine Signals Inc.
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.
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.
18 #include "rsi_common.h"
22 * rsi_determine_min_weight_queue() - This function determines the queue with
24 * @common: Pointer to the driver private structure.
26 * Return: q_num: Corresponding queue number.
28 static u8 rsi_determine_min_weight_queue(struct rsi_common *common)
30 struct wmm_qinfo *tx_qinfo = common->tx_qinfo;
34 for (ii = 0; ii < NUM_EDCA_QUEUES; ii++) {
35 q_len = skb_queue_len(&common->tx_queue[ii]);
36 if ((tx_qinfo[ii].pkt_contended) && q_len) {
37 common->min_weight = tx_qinfo[ii].weight;
45 * rsi_recalculate_weights() - This function recalculates the weights
46 * corresponding to each queue.
47 * @common: Pointer to the driver private structure.
49 * Return: recontend_queue bool variable
51 static bool rsi_recalculate_weights(struct rsi_common *common)
53 struct wmm_qinfo *tx_qinfo = common->tx_qinfo;
54 bool recontend_queue = false;
58 for (ii = 0; ii < NUM_EDCA_QUEUES; ii++) {
59 q_len = skb_queue_len(&common->tx_queue[ii]);
60 /* Check for the need of contention */
62 if (tx_qinfo[ii].pkt_contended) {
64 ((tx_qinfo[ii].weight > common->min_weight) ?
65 tx_qinfo[ii].weight - common->min_weight : 0);
67 tx_qinfo[ii].pkt_contended = 1;
68 tx_qinfo[ii].weight = tx_qinfo[ii].wme_params;
69 recontend_queue = true;
71 } else { /* No packets so no contention */
72 tx_qinfo[ii].weight = 0;
73 tx_qinfo[ii].pkt_contended = 0;
77 return recontend_queue;
81 * rsi_get_num_pkts_dequeue() - This function determines the number of
82 * packets to be dequeued based on the number
83 * of bytes calculated using txop.
85 * @common: Pointer to the driver private structure.
86 * @q_num: the queue from which pkts have to be dequeued
88 * Return: pkt_num: Number of pkts to be dequeued.
90 static u32 rsi_get_num_pkts_dequeue(struct rsi_common *common, u8 q_num)
92 struct rsi_hw *adapter = common->priv;
95 s16 txop = common->tx_qinfo[q_num].txop * 32;
97 struct ieee80211_rate rate;
99 rate.bitrate = RSI_RATE_MCS0 * 5 * 10; /* Convert to Kbps */
101 txop = ((txop << 5) / 80);
103 if (skb_queue_len(&common->tx_queue[q_num]))
104 skb = skb_peek(&common->tx_queue[q_num]);
109 r_txop = ieee80211_generic_frame_duration(adapter->hw,
113 txop -= le16_to_cpu(r_txop);
115 /*checking if pkts are still there*/
116 if (skb_queue_len(&common->tx_queue[q_num]) - pkt_cnt)
127 * rsi_core_determine_hal_queue() - This function determines the queue from
128 * which packet has to be dequeued.
129 * @common: Pointer to the driver private structure.
131 * Return: q_num: Corresponding queue number on success.
133 static u8 rsi_core_determine_hal_queue(struct rsi_common *common)
135 bool recontend_queue = false;
137 u8 q_num = INVALID_QUEUE;
140 if (skb_queue_len(&common->tx_queue[MGMT_BEACON_Q])) {
141 q_num = MGMT_BEACON_Q;
144 if (skb_queue_len(&common->tx_queue[MGMT_SOFT_Q])) {
145 if (!common->mgmt_q_block)
150 if (common->hw_data_qs_blocked)
153 if (common->pkt_cnt != 0) {
155 return common->selected_qnum;
159 recontend_queue = false;
161 q_num = rsi_determine_min_weight_queue(common);
165 /* Selecting the queue with least back off */
166 for (; ii < NUM_EDCA_QUEUES; ii++) {
167 q_len = skb_queue_len(&common->tx_queue[ii]);
168 if (((common->tx_qinfo[ii].pkt_contended) &&
169 (common->tx_qinfo[ii].weight < common->min_weight)) &&
171 common->min_weight = common->tx_qinfo[ii].weight;
176 if (q_num < NUM_EDCA_QUEUES)
177 common->tx_qinfo[q_num].pkt_contended = 0;
179 /* Adjust the back off values for all queues again */
180 recontend_queue = rsi_recalculate_weights(common);
182 q_len = skb_queue_len(&common->tx_queue[q_num]);
184 /* If any queues are freshly contended and the selected queue
185 * doesn't have any packets
186 * then get the queue number again with fresh values
191 q_num = INVALID_QUEUE;
195 common->selected_qnum = q_num;
196 q_len = skb_queue_len(&common->tx_queue[q_num]);
198 if (q_num == VO_Q || q_num == VI_Q) {
199 common->pkt_cnt = rsi_get_num_pkts_dequeue(common, q_num);
200 common->pkt_cnt -= 1;
207 * rsi_core_queue_pkt() - This functions enqueues the packet to the queue
208 * specified by the queue number.
209 * @common: Pointer to the driver private structure.
210 * @skb: Pointer to the socket buffer structure.
214 static void rsi_core_queue_pkt(struct rsi_common *common,
217 u8 q_num = skb->priority;
218 if (q_num >= NUM_SOFT_QUEUES) {
219 rsi_dbg(ERR_ZONE, "%s: Invalid Queue Number: q_num = %d\n",
225 skb_queue_tail(&common->tx_queue[q_num], skb);
229 * rsi_core_dequeue_pkt() - This functions dequeues the packet from the queue
230 * specified by the queue number.
231 * @common: Pointer to the driver private structure.
232 * @q_num: Queue number.
234 * Return: Pointer to sk_buff structure.
236 static struct sk_buff *rsi_core_dequeue_pkt(struct rsi_common *common,
239 if (q_num >= NUM_SOFT_QUEUES) {
240 rsi_dbg(ERR_ZONE, "%s: Invalid Queue Number: q_num = %d\n",
245 return skb_dequeue(&common->tx_queue[q_num]);
249 * rsi_core_qos_processor() - This function is used to determine the wmm queue
250 * based on the backoff procedure. Data packets are
251 * dequeued from the selected hal queue and sent to
253 * @common: Pointer to the driver private structure.
257 void rsi_core_qos_processor(struct rsi_common *common)
259 struct rsi_hw *adapter = common->priv;
261 unsigned long tstamp_1, tstamp_2;
267 q_num = rsi_core_determine_hal_queue(common);
268 rsi_dbg(DATA_TX_ZONE,
269 "%s: Queue number = %d\n", __func__, q_num);
271 if (q_num == INVALID_QUEUE) {
272 rsi_dbg(DATA_TX_ZONE, "%s: No More Pkt\n", __func__);
276 mutex_lock(&common->tx_lock);
278 status = adapter->check_hw_queue_status(adapter, q_num);
280 mutex_unlock(&common->tx_lock);
284 if ((q_num < MGMT_SOFT_Q) &&
285 ((skb_queue_len(&common->tx_queue[q_num])) <=
286 MIN_DATA_QUEUE_WATER_MARK)) {
287 if (ieee80211_queue_stopped(adapter->hw, WME_AC(q_num)))
288 ieee80211_wake_queue(adapter->hw,
292 skb = rsi_core_dequeue_pkt(common, q_num);
294 rsi_dbg(ERR_ZONE, "skb null\n");
295 mutex_unlock(&common->tx_lock);
299 if (q_num == MGMT_SOFT_Q) {
300 status = rsi_send_mgmt_pkt(common, skb);
301 } else if (q_num == MGMT_BEACON_Q) {
302 status = rsi_send_pkt_to_bus(common, skb);
305 status = rsi_send_data_pkt(common, skb);
309 mutex_unlock(&common->tx_lock);
313 common->tx_stats.total_tx_pkt_send[q_num]++;
316 mutex_unlock(&common->tx_lock);
318 if (time_after(tstamp_2, tstamp_1 + (300 * HZ) / 1000))
323 struct rsi_sta *rsi_find_sta(struct rsi_common *common, u8 *mac_addr)
327 for (i = 0; i < common->max_stations; i++) {
328 if (!common->stations[i].sta)
330 if (!(memcmp(common->stations[i].sta->addr,
331 mac_addr, ETH_ALEN)))
332 return &common->stations[i];
338 * rsi_core_xmit() - This function transmits the packets received from mac80211
339 * @common: Pointer to the driver private structure.
340 * @skb: Pointer to the socket buffer structure.
344 void rsi_core_xmit(struct rsi_common *common, struct sk_buff *skb)
346 struct rsi_hw *adapter = common->priv;
347 struct ieee80211_tx_info *info;
348 struct skb_info *tx_params;
349 struct ieee80211_hdr *wh;
350 struct ieee80211_vif *vif = adapter->vifs[0];
352 struct rsi_sta *rsta = NULL;
354 if ((!skb) || (!skb->len)) {
355 rsi_dbg(ERR_ZONE, "%s: Null skb/zero Length packet\n",
359 if (common->fsm_state != FSM_MAC_INIT_DONE) {
360 rsi_dbg(ERR_ZONE, "%s: FSM state not open\n", __func__);
364 info = IEEE80211_SKB_CB(skb);
365 tx_params = (struct skb_info *)info->driver_data;
366 wh = (struct ieee80211_hdr *)&skb->data[0];
367 tx_params->sta_id = 0;
369 if ((ieee80211_is_mgmt(wh->frame_control)) ||
370 (ieee80211_is_ctl(wh->frame_control)) ||
371 (ieee80211_is_qos_nullfunc(wh->frame_control))) {
373 skb->priority = q_num;
375 if (ieee80211_is_data_qos(wh->frame_control)) {
376 tid = (skb->data[24] & IEEE80211_QOS_TID);
377 skb->priority = TID_TO_WME_AC(tid);
379 tid = IEEE80211_NONQOS_TID;
380 skb->priority = BE_Q;
383 q_num = skb->priority;
384 tx_params->tid = tid;
386 if ((vif->type == NL80211_IFTYPE_AP) &&
387 (!is_broadcast_ether_addr(wh->addr1)) &&
388 (!is_multicast_ether_addr(wh->addr1))) {
389 rsta = rsi_find_sta(common, wh->addr1);
392 tx_params->sta_id = rsta->sta_id;
396 /* Start aggregation if not done for this tid */
397 if (!rsta->start_tx_aggr[tid]) {
398 rsta->start_tx_aggr[tid] = true;
399 ieee80211_start_tx_ba_session(rsta->sta,
405 if ((q_num < MGMT_SOFT_Q) &&
406 ((skb_queue_len(&common->tx_queue[q_num]) + 1) >=
407 DATA_QUEUE_WATER_MARK)) {
408 rsi_dbg(ERR_ZONE, "%s: sw queue full\n", __func__);
409 if (!ieee80211_queue_stopped(adapter->hw, WME_AC(q_num)))
410 ieee80211_stop_queue(adapter->hw, WME_AC(q_num));
411 rsi_set_event(&common->tx_thread.event);
415 rsi_core_queue_pkt(common, skb);
416 rsi_dbg(DATA_TX_ZONE, "%s: ===> Scheduling TX thead <===\n", __func__);
417 rsi_set_event(&common->tx_thread.event);
422 rsi_dbg(ERR_ZONE, "%s: Failed to queue packet\n", __func__);
423 /* Dropping pkt here */
424 ieee80211_free_txskb(common->priv->hw, skb);