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"
21 * rsi_determine_min_weight_queue() - This function determines the queue with
23 * @common: Pointer to the driver private structure.
25 * Return: q_num: Corresponding queue number.
27 static u8 rsi_determine_min_weight_queue(struct rsi_common *common)
29 struct wmm_qinfo *tx_qinfo = common->tx_qinfo;
33 for (ii = 0; ii < NUM_EDCA_QUEUES; ii++) {
34 q_len = skb_queue_len(&common->tx_queue[ii]);
35 if ((tx_qinfo[ii].pkt_contended) && q_len) {
36 common->min_weight = tx_qinfo[ii].weight;
44 * rsi_recalculate_weights() - This function recalculates the weights
45 * corresponding to each queue.
46 * @common: Pointer to the driver private structure.
48 * Return: recontend_queue bool variable
50 static bool rsi_recalculate_weights(struct rsi_common *common)
52 struct wmm_qinfo *tx_qinfo = common->tx_qinfo;
53 bool recontend_queue = false;
57 for (ii = 0; ii < NUM_EDCA_QUEUES; ii++) {
58 q_len = skb_queue_len(&common->tx_queue[ii]);
59 /* Check for the need of contention */
61 if (tx_qinfo[ii].pkt_contended) {
63 ((tx_qinfo[ii].weight > common->min_weight) ?
64 tx_qinfo[ii].weight - common->min_weight : 0);
66 tx_qinfo[ii].pkt_contended = 1;
67 tx_qinfo[ii].weight = tx_qinfo[ii].wme_params;
68 recontend_queue = true;
70 } else { /* No packets so no contention */
71 tx_qinfo[ii].weight = 0;
72 tx_qinfo[ii].pkt_contended = 0;
76 return recontend_queue;
80 * rsi_get_num_pkts_dequeue() - This function determines the number of
81 * packets to be dequeued based on the number
82 * of bytes calculated using txop.
84 * @common: Pointer to the driver private structure.
85 * @q_num: the queue from which pkts have to be dequeued
87 * Return: pkt_num: Number of pkts to be dequeued.
89 static u32 rsi_get_num_pkts_dequeue(struct rsi_common *common, u8 q_num)
91 struct rsi_hw *adapter = common->priv;
94 s16 txop = common->tx_qinfo[q_num].txop * 32;
96 struct ieee80211_rate rate;
98 rate.bitrate = RSI_RATE_MCS0 * 5 * 10; /* Convert to Kbps */
100 txop = ((txop << 5) / 80);
102 if (skb_queue_len(&common->tx_queue[q_num]))
103 skb = skb_peek(&common->tx_queue[q_num]);
108 r_txop = ieee80211_generic_frame_duration(adapter->hw,
112 txop -= le16_to_cpu(r_txop);
114 /*checking if pkts are still there*/
115 if (skb_queue_len(&common->tx_queue[q_num]) - pkt_cnt)
126 * rsi_core_determine_hal_queue() - This function determines the queue from
127 * which packet has to be dequeued.
128 * @common: Pointer to the driver private structure.
130 * Return: q_num: Corresponding queue number on success.
132 static u8 rsi_core_determine_hal_queue(struct rsi_common *common)
134 bool recontend_queue = false;
136 u8 q_num = INVALID_QUEUE;
139 if (skb_queue_len(&common->tx_queue[MGMT_SOFT_Q])) {
140 if (!common->mgmt_q_block)
145 if (common->hw_data_qs_blocked)
148 if (common->pkt_cnt != 0) {
150 return common->selected_qnum;
154 recontend_queue = false;
156 q_num = rsi_determine_min_weight_queue(common);
160 /* Selecting the queue with least back off */
161 for (; ii < NUM_EDCA_QUEUES; ii++) {
162 q_len = skb_queue_len(&common->tx_queue[ii]);
163 if (((common->tx_qinfo[ii].pkt_contended) &&
164 (common->tx_qinfo[ii].weight < common->min_weight)) &&
166 common->min_weight = common->tx_qinfo[ii].weight;
171 if (q_num < NUM_EDCA_QUEUES)
172 common->tx_qinfo[q_num].pkt_contended = 0;
174 /* Adjust the back off values for all queues again */
175 recontend_queue = rsi_recalculate_weights(common);
177 q_len = skb_queue_len(&common->tx_queue[q_num]);
179 /* If any queues are freshly contended and the selected queue
180 * doesn't have any packets
181 * then get the queue number again with fresh values
186 q_num = INVALID_QUEUE;
190 common->selected_qnum = q_num;
191 q_len = skb_queue_len(&common->tx_queue[q_num]);
193 if (q_num == VO_Q || q_num == VI_Q) {
194 common->pkt_cnt = rsi_get_num_pkts_dequeue(common, q_num);
195 common->pkt_cnt -= 1;
202 * rsi_core_queue_pkt() - This functions enqueues the packet to the queue
203 * specified by the queue number.
204 * @common: Pointer to the driver private structure.
205 * @skb: Pointer to the socket buffer structure.
209 static void rsi_core_queue_pkt(struct rsi_common *common,
212 u8 q_num = skb->priority;
213 if (q_num >= NUM_SOFT_QUEUES) {
214 rsi_dbg(ERR_ZONE, "%s: Invalid Queue Number: q_num = %d\n",
220 skb_queue_tail(&common->tx_queue[q_num], skb);
224 * rsi_core_dequeue_pkt() - This functions dequeues the packet from the queue
225 * specified by the queue number.
226 * @common: Pointer to the driver private structure.
227 * @q_num: Queue number.
229 * Return: Pointer to sk_buff structure.
231 static struct sk_buff *rsi_core_dequeue_pkt(struct rsi_common *common,
234 if (q_num >= NUM_SOFT_QUEUES) {
235 rsi_dbg(ERR_ZONE, "%s: Invalid Queue Number: q_num = %d\n",
240 return skb_dequeue(&common->tx_queue[q_num]);
244 * rsi_core_qos_processor() - This function is used to determine the wmm queue
245 * based on the backoff procedure. Data packets are
246 * dequeued from the selected hal queue and sent to
248 * @common: Pointer to the driver private structure.
252 void rsi_core_qos_processor(struct rsi_common *common)
254 struct rsi_hw *adapter = common->priv;
256 unsigned long tstamp_1, tstamp_2;
262 q_num = rsi_core_determine_hal_queue(common);
263 rsi_dbg(DATA_TX_ZONE,
264 "%s: Queue number = %d\n", __func__, q_num);
266 if (q_num == INVALID_QUEUE) {
267 rsi_dbg(DATA_TX_ZONE, "%s: No More Pkt\n", __func__);
271 mutex_lock(&common->tx_rxlock);
273 status = adapter->check_hw_queue_status(adapter, q_num);
275 mutex_unlock(&common->tx_rxlock);
279 if ((q_num < MGMT_SOFT_Q) &&
280 ((skb_queue_len(&common->tx_queue[q_num])) <=
281 MIN_DATA_QUEUE_WATER_MARK)) {
282 if (ieee80211_queue_stopped(adapter->hw, WME_AC(q_num)))
283 ieee80211_wake_queue(adapter->hw,
287 skb = rsi_core_dequeue_pkt(common, q_num);
289 rsi_dbg(ERR_ZONE, "skb null\n");
290 mutex_unlock(&common->tx_rxlock);
294 if (q_num == MGMT_SOFT_Q)
295 status = rsi_send_mgmt_pkt(common, skb);
297 status = rsi_send_data_pkt(common, skb);
300 mutex_unlock(&common->tx_rxlock);
304 common->tx_stats.total_tx_pkt_send[q_num]++;
307 mutex_unlock(&common->tx_rxlock);
309 if (tstamp_2 > tstamp_1 + (300 * HZ / 1000))
315 * rsi_core_xmit() - This function transmits the packets received from mac80211
316 * @common: Pointer to the driver private structure.
317 * @skb: Pointer to the socket buffer structure.
321 void rsi_core_xmit(struct rsi_common *common, struct sk_buff *skb)
323 struct rsi_hw *adapter = common->priv;
324 struct ieee80211_tx_info *info;
325 struct skb_info *tx_params;
326 struct ieee80211_hdr *tmp_hdr = NULL;
329 if ((!skb) || (!skb->len)) {
330 rsi_dbg(ERR_ZONE, "%s: Null skb/zero Length packet\n",
334 info = IEEE80211_SKB_CB(skb);
335 tx_params = (struct skb_info *)info->driver_data;
336 tmp_hdr = (struct ieee80211_hdr *)&skb->data[0];
338 if (common->fsm_state != FSM_MAC_INIT_DONE) {
339 rsi_dbg(ERR_ZONE, "%s: FSM state not open\n", __func__);
343 if ((ieee80211_is_mgmt(tmp_hdr->frame_control)) ||
344 (ieee80211_is_ctl(tmp_hdr->frame_control)) ||
345 (ieee80211_is_qos_nullfunc(tmp_hdr->frame_control))) {
347 skb->priority = q_num;
349 if (ieee80211_is_data_qos(tmp_hdr->frame_control)) {
350 tid = (skb->data[24] & IEEE80211_QOS_TID);
351 skb->priority = TID_TO_WME_AC(tid);
353 tid = IEEE80211_NONQOS_TID;
354 skb->priority = BE_Q;
356 q_num = skb->priority;
357 tx_params->tid = tid;
358 tx_params->sta_id = 0;
361 if ((q_num != MGMT_SOFT_Q) &&
362 ((skb_queue_len(&common->tx_queue[q_num]) + 1) >=
363 DATA_QUEUE_WATER_MARK)) {
364 rsi_dbg(ERR_ZONE, "%s: sw queue full\n", __func__);
365 if (!ieee80211_queue_stopped(adapter->hw, WME_AC(q_num)))
366 ieee80211_stop_queue(adapter->hw, WME_AC(q_num));
367 rsi_set_event(&common->tx_thread.event);
371 rsi_core_queue_pkt(common, skb);
372 rsi_dbg(DATA_TX_ZONE, "%s: ===> Scheduling TX thead <===\n", __func__);
373 rsi_set_event(&common->tx_thread.event);
378 rsi_dbg(ERR_ZONE, "%s: Failed to queue packet\n", __func__);
379 /* Dropping pkt here */
380 ieee80211_free_txskb(common->priv->hw, skb);