[deliverable/linux.git] / drivers / net / wireless / rsi / rsi_91x_core.c

/**
 * Copyright (c) 2014 Redpine Signals Inc.
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include "rsi_mgmt.h"
#include "rsi_common.h"

/**
 * rsi_determine_min_weight_queue() - This function determines the queue with
 *				      the min weight.
 * @common: Pointer to the driver private structure.
 *
 * Return: q_num: Corresponding queue number.
 */
static u8 rsi_determine_min_weight_queue(struct rsi_common *common)
{
	struct wmm_qinfo *tx_qinfo = common->tx_qinfo;
	u32 q_len = 0;
	u8 ii = 0;

	for (ii = 0; ii < NUM_EDCA_QUEUES; ii++) {
		q_len = skb_queue_len(&common->tx_queue[ii]);
		if ((tx_qinfo[ii].pkt_contended) && q_len) {
			common->min_weight = tx_qinfo[ii].weight;
			break;
		}
	}
	return ii;
}

/**
 * rsi_recalculate_weights() - This function recalculates the weights
 *			       corresponding to each queue.
 * @common: Pointer to the driver private structure.
 *
 * Return: recontend_queue bool variable
 */
static bool rsi_recalculate_weights(struct rsi_common *common)
{
	struct wmm_qinfo *tx_qinfo = common->tx_qinfo;
	bool recontend_queue = false;
	u8 ii = 0;
	u32 q_len = 0;

	for (ii = 0; ii < NUM_EDCA_QUEUES; ii++) {
		q_len = skb_queue_len(&common->tx_queue[ii]);
		/* Check for the need of contention */
		if (q_len) {
			if (tx_qinfo[ii].pkt_contended) {
				tx_qinfo[ii].weight =
				((tx_qinfo[ii].weight > common->min_weight) ?
				 tx_qinfo[ii].weight - common->min_weight : 0);
			} else {
				tx_qinfo[ii].pkt_contended = 1;
				tx_qinfo[ii].weight = tx_qinfo[ii].wme_params;
				recontend_queue = true;
			}
		} else { /* No packets so no contention */
			tx_qinfo[ii].weight = 0;
			tx_qinfo[ii].pkt_contended = 0;
		}
	}

	return recontend_queue;
}

/**
 * rsi_core_determine_hal_queue() - This function determines the queue from
 *				    which packet has to be dequeued.
 * @common: Pointer to the driver private structure.
 *
 * Return: q_num: Corresponding queue number on success.
 */
static u8 rsi_core_determine_hal_queue(struct rsi_common *common)
{
	bool recontend_queue = false;
	u32 q_len = 0;
	u8 q_num = INVALID_QUEUE;
	u8 ii, min = 0;

	if (skb_queue_len(&common->tx_queue[MGMT_SOFT_Q])) {
		if (!common->mgmt_q_block)
			q_num = MGMT_SOFT_Q;
		return q_num;
	}

	if (common->pkt_cnt != 0) {
		--common->pkt_cnt;
		return common->selected_qnum;
	}

get_queue_num:
	q_num = 0;
	recontend_queue = false;

	q_num = rsi_determine_min_weight_queue(common);
	q_len = skb_queue_len(&common->tx_queue[ii]);
	ii = q_num;

	/* Selecting the queue with least back off */
	for (; ii < NUM_EDCA_QUEUES; ii++) {
		if (((common->tx_qinfo[ii].pkt_contended) &&
		     (common->tx_qinfo[ii].weight < min)) && q_len) {
			min = common->tx_qinfo[ii].weight;
			q_num = ii;
		}
	}

	common->tx_qinfo[q_num].pkt_contended = 0;
	/* Adjust the back off values for all queues again */
	recontend_queue = rsi_recalculate_weights(common);

	q_len = skb_queue_len(&common->tx_queue[q_num]);
	if (!q_len) {
		/* If any queues are freshly contended and the selected queue
		 * doesn't have any packets
		 * then get the queue number again with fresh values
		 */
		if (recontend_queue)
			goto get_queue_num;

		q_num = INVALID_QUEUE;
		return q_num;
	}

	common->selected_qnum = q_num;
	q_len = skb_queue_len(&common->tx_queue[q_num]);

	switch (common->selected_qnum) {
	case VO_Q:
		if (q_len > MAX_CONTINUOUS_VO_PKTS)
			common->pkt_cnt = (MAX_CONTINUOUS_VO_PKTS - 1);
		else
			common->pkt_cnt = --q_len;
		break;

	case VI_Q:
		if (q_len > MAX_CONTINUOUS_VI_PKTS)
			common->pkt_cnt = (MAX_CONTINUOUS_VI_PKTS - 1);
		else
			common->pkt_cnt = --q_len;

		break;

	default:
		common->pkt_cnt = 0;
		break;
	}

	return q_num;
}

/**
 * rsi_core_queue_pkt() - This functions enqueues the packet to the queue
 *			  specified by the queue number.
 * @common: Pointer to the driver private structure.
 * @skb: Pointer to the socket buffer structure.
 *
 * Return: None.
 */
static void rsi_core_queue_pkt(struct rsi_common *common,
			       struct sk_buff *skb)
{
	u8 q_num = skb->priority;
	if (q_num >= NUM_SOFT_QUEUES) {
		rsi_dbg(ERR_ZONE, "%s: Invalid Queue Number: q_num = %d\n",
			__func__, q_num);
		dev_kfree_skb(skb);
		return;
	}

	skb_queue_tail(&common->tx_queue[q_num], skb);
}

/**
 * rsi_core_dequeue_pkt() - This functions dequeues the packet from the queue
 *			    specified by the queue number.
 * @common: Pointer to the driver private structure.
 * @q_num: Queue number.
 *
 * Return: Pointer to sk_buff structure.
 */
static struct sk_buff *rsi_core_dequeue_pkt(struct rsi_common *common,
					    u8 q_num)
{
	if (q_num >= NUM_SOFT_QUEUES) {
		rsi_dbg(ERR_ZONE, "%s: Invalid Queue Number: q_num = %d\n",
			__func__, q_num);
		return NULL;
	}

	return skb_dequeue(&common->tx_queue[q_num]);
}

/**
 * rsi_core_qos_processor() - This function is used to determine the wmm queue
 *			      based on the backoff procedure. Data packets are
 *			      dequeued from the selected hal queue and sent to
 *			      the below layers.
 * @common: Pointer to the driver private structure.
 *
 * Return: None.
 */
void rsi_core_qos_processor(struct rsi_common *common)
{
	struct rsi_hw *adapter = common->priv;
	struct sk_buff *skb;
	unsigned long tstamp_1, tstamp_2;
	u8 q_num;
	int status;

	tstamp_1 = jiffies;
	while (1) {
		q_num = rsi_core_determine_hal_queue(common);
		rsi_dbg(DATA_TX_ZONE,
			"%s: Queue number = %d\n", __func__, q_num);

		if (q_num == INVALID_QUEUE) {
			rsi_dbg(DATA_TX_ZONE, "%s: No More Pkt\n", __func__);
			break;
		}

		mutex_lock(&common->tx_rxlock);

		status = adapter->check_hw_queue_status(adapter, q_num);
		if ((status <= 0)) {
			mutex_unlock(&common->tx_rxlock);
			break;
		}

		if ((q_num < MGMT_SOFT_Q) &&
		    ((skb_queue_len(&common->tx_queue[q_num])) <=
		      MIN_DATA_QUEUE_WATER_MARK)) {
			if (ieee80211_queue_stopped(adapter->hw, WME_AC(q_num)))
				ieee80211_wake_queue(adapter->hw,
						     WME_AC(q_num));
		}

		skb = rsi_core_dequeue_pkt(common, q_num);
		if (skb == NULL) {
			mutex_unlock(&common->tx_rxlock);
			break;
		}

		if (q_num == MGMT_SOFT_Q)
			status = rsi_send_mgmt_pkt(common, skb);
		else
			status = rsi_send_data_pkt(common, skb);

		if (status) {
			mutex_unlock(&common->tx_rxlock);
			break;
		}

		common->tx_stats.total_tx_pkt_send[q_num]++;

		tstamp_2 = jiffies;
		mutex_unlock(&common->tx_rxlock);

		if (tstamp_2 > tstamp_1 + (300 * HZ / 1000))
			schedule();
	}
}

/**
 * rsi_core_xmit() - This function transmits the packets received from mac80211
 * @common: Pointer to the driver private structure.
 * @skb: Pointer to the socket buffer structure.
 *
 * Return: None.
 */
void rsi_core_xmit(struct rsi_common *common, struct sk_buff *skb)
{
	struct rsi_hw *adapter = common->priv;
	struct ieee80211_tx_info *info;
	struct skb_info *tx_params;
	struct ieee80211_hdr *tmp_hdr = NULL;
	u8 q_num, tid = 0;

	if ((!skb) || (!skb->len)) {
		rsi_dbg(ERR_ZONE, "%s: Null skb/zero Length packet\n",
			__func__);
		goto xmit_fail;
	}
	info = IEEE80211_SKB_CB(skb);
	tx_params = (struct skb_info *)info->driver_data;
	tmp_hdr = (struct ieee80211_hdr *)&skb->data[0];

	if (common->fsm_state != FSM_MAC_INIT_DONE) {
		rsi_dbg(ERR_ZONE, "%s: FSM state not open\n", __func__);
		goto xmit_fail;
	}

	if ((ieee80211_is_mgmt(tmp_hdr->frame_control)) ||
	    (ieee80211_is_ctl(tmp_hdr->frame_control))) {
		q_num = MGMT_SOFT_Q;
		skb->priority = q_num;
	} else {
		if (ieee80211_is_data_qos(tmp_hdr->frame_control)) {
			tid = (skb->data[24] & IEEE80211_QOS_TID);
			skb->priority = TID_TO_WME_AC(tid);
		} else {
			tid = IEEE80211_NONQOS_TID;
			skb->priority = BE_Q;
		}
		q_num = skb->priority;
		tx_params->tid = tid;
		tx_params->sta_id = 0;
	}

	if ((q_num != MGMT_SOFT_Q) &&
	    ((skb_queue_len(&common->tx_queue[q_num]) + 1) >=
	     DATA_QUEUE_WATER_MARK)) {
		if (!ieee80211_queue_stopped(adapter->hw, WME_AC(q_num)))
			ieee80211_stop_queue(adapter->hw, WME_AC(q_num));
		rsi_set_event(&common->tx_thread.event);
		goto xmit_fail;
	}

	rsi_core_queue_pkt(common, skb);
	rsi_dbg(DATA_TX_ZONE, "%s: ===> Scheduling TX thead <===\n", __func__);
	rsi_set_event(&common->tx_thread.event);

	return;

xmit_fail:
	rsi_dbg(ERR_ZONE, "%s: Failed to queue packet\n", __func__);
	/* Dropping pkt here */
	ieee80211_free_txskb(common->priv->hw, skb);
}
Commit	Line	Data
dad0d04f FF	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
	20	/**
	21	* rsi_determine_min_weight_queue() - This function determines the queue with
	22	* the min weight.
	23	* @common: Pointer to the driver private structure.
	24	*
	25	* Return: q_num: Corresponding queue number.
	26	*/
	27	static u8 rsi_determine_min_weight_queue(struct rsi_common *common)
	28	{
	29	struct wmm_qinfo *tx_qinfo = common->tx_qinfo;
	30	u32 q_len = 0;
	31	u8 ii = 0;
	32
	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;
	37	break;
	38	}
	39	}
	40	return ii;
	41	}
	42
	43	/**
	44	* rsi_recalculate_weights() - This function recalculates the weights
	45	* corresponding to each queue.
	46	* @common: Pointer to the driver private structure.
	47	*
	48	* Return: recontend_queue bool variable
	49	*/
	50	static bool rsi_recalculate_weights(struct rsi_common *common)
	51	{
	52	struct wmm_qinfo *tx_qinfo = common->tx_qinfo;
	53	bool recontend_queue = false;
	54	u8 ii = 0;
	55	u32 q_len = 0;
	56
	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 */
	60	if (q_len) {
	61	if (tx_qinfo[ii].pkt_contended) {
	62	tx_qinfo[ii].weight =
	63	((tx_qinfo[ii].weight > common->min_weight) ?
	64	tx_qinfo[ii].weight - common->min_weight : 0);
65	} else {
66	tx_qinfo[ii].pkt_contended = 1;
67	tx_qinfo[ii].weight = tx_qinfo[ii].wme_params;
68	recontend_queue = true;
69	}
70	} else { /* No packets so no contention */
71	tx_qinfo[ii].weight = 0;
72	tx_qinfo[ii].pkt_contended = 0;
73	}
74	}
75
76	return recontend_queue;
77	}
78
79	/**
80	* rsi_core_determine_hal_queue() - This function determines the queue from
81	* which packet has to be dequeued.
82	* @common: Pointer to the driver private structure.
83	*
84	* Return: q_num: Corresponding queue number on success.
85	*/
86	static u8 rsi_core_determine_hal_queue(struct rsi_common *common)
87	{
88	bool recontend_queue = false;
89	u32 q_len = 0;
90	u8 q_num = INVALID_QUEUE;
91	u8 ii, min = 0;
92
93	if (skb_queue_len(&common->tx_queue[MGMT_SOFT_Q])) {
94	if (!common->mgmt_q_block)
95	q_num = MGMT_SOFT_Q;
96	return q_num;
97	}
98
99	if (common->pkt_cnt != 0) {
100	--common->pkt_cnt;
101	return common->selected_qnum;
102	}
103
104	get_queue_num:
105	q_num = 0;
106	recontend_queue = false;
107
108	q_num = rsi_determine_min_weight_queue(common);
109	q_len = skb_queue_len(&common->tx_queue[ii]);
110	ii = q_num;
111
112	/* Selecting the queue with least back off */
113	for (; ii < NUM_EDCA_QUEUES; ii++) {
114	if (((common->tx_qinfo[ii].pkt_contended) &&
115	(common->tx_qinfo[ii].weight < min)) && q_len) {
116	min = common->tx_qinfo[ii].weight;
117	q_num = ii;
118	}
119	}
120
121	common->tx_qinfo[q_num].pkt_contended = 0;
122	/* Adjust the back off values for all queues again */
123	recontend_queue = rsi_recalculate_weights(common);
124
125	q_len = skb_queue_len(&common->tx_queue[q_num]);
126	if (!q_len) {
127	/* If any queues are freshly contended and the selected queue
128	* doesn't have any packets
129	* then get the queue number again with fresh values
130	*/
131	if (recontend_queue)
132	goto get_queue_num;
133
134	q_num = INVALID_QUEUE;
135	return q_num;
136	}
137
138	common->selected_qnum = q_num;
139	q_len = skb_queue_len(&common->tx_queue[q_num]);
140
141	switch (common->selected_qnum) {
142	case VO_Q:
143	if (q_len > MAX_CONTINUOUS_VO_PKTS)
144	common->pkt_cnt = (MAX_CONTINUOUS_VO_PKTS - 1);
145	else
146	common->pkt_cnt = --q_len;
147	break;
148
149	case VI_Q:
150	if (q_len > MAX_CONTINUOUS_VI_PKTS)
151	common->pkt_cnt = (MAX_CONTINUOUS_VI_PKTS - 1);
152	else
153	common->pkt_cnt = --q_len;
154
155	break;
156
157	default:
158	common->pkt_cnt = 0;
159	break;
160	}
161
162	return q_num;
163	}
164
165	/**
166	* rsi_core_queue_pkt() - This functions enqueues the packet to the queue
167	* specified by the queue number.
168	* @common: Pointer to the driver private structure.
169	* @skb: Pointer to the socket buffer structure.
170	*
171	* Return: None.
172	*/
173	static void rsi_core_queue_pkt(struct rsi_common *common,
174	struct sk_buff *skb)
175	{
176	u8 q_num = skb->priority;
177	if (q_num >= NUM_SOFT_QUEUES) {
178	rsi_dbg(ERR_ZONE, "%s: Invalid Queue Number: q_num = %d\n",
179	__func__, q_num);
180	dev_kfree_skb(skb);
181	return;
182	}
183
184	skb_queue_tail(&common->tx_queue[q_num], skb);
185	}
186
187	/**
188	* rsi_core_dequeue_pkt() - This functions dequeues the packet from the queue
189	* specified by the queue number.
190	* @common: Pointer to the driver private structure.
191	* @q_num: Queue number.
192	*
193	* Return: Pointer to sk_buff structure.
194	*/
195	static struct sk_buff rsi_core_dequeue_pkt(struct rsi_common common,
196	u8 q_num)
197	{
198	if (q_num >= NUM_SOFT_QUEUES) {
199	rsi_dbg(ERR_ZONE, "%s: Invalid Queue Number: q_num = %d\n",
200	__func__, q_num);
201	return NULL;
202	}
203
204	return skb_dequeue(&common->tx_queue[q_num]);
205	}
206
207	/**
208	* rsi_core_qos_processor() - This function is used to determine the wmm queue
209	* based on the backoff procedure. Data packets are
210	* dequeued from the selected hal queue and sent to
211	* the below layers.
212	* @common: Pointer to the driver private structure.
213	*
214	* Return: None.
215	*/
216	void rsi_core_qos_processor(struct rsi_common *common)
217	{
218	struct rsi_hw *adapter = common->priv;
219	struct sk_buff *skb;
220	unsigned long tstamp_1, tstamp_2;
221	u8 q_num;
222	int status;
223
224	tstamp_1 = jiffies;
225	while (1) {
226	q_num = rsi_core_determine_hal_queue(common);
227	rsi_dbg(DATA_TX_ZONE,
228	"%s: Queue number = %d\n", __func__, q_num);
229
230	if (q_num == INVALID_QUEUE) {
231	rsi_dbg(DATA_TX_ZONE, "%s: No More Pkt\n", __func__);
232	break;
233	}
234
235	mutex_lock(&common->tx_rxlock);
236
237	status = adapter->check_hw_queue_status(adapter, q_num);
238	if ((status <= 0)) {
239	mutex_unlock(&common->tx_rxlock);
240	break;
241	}
242
243	if ((q_num < MGMT_SOFT_Q) &&
244	((skb_queue_len(&common->tx_queue[q_num])) <=
245	MIN_DATA_QUEUE_WATER_MARK)) {
246	if (ieee80211_queue_stopped(adapter->hw, WME_AC(q_num)))
247	ieee80211_wake_queue(adapter->hw,
248	WME_AC(q_num));
249	}
250
251	skb = rsi_core_dequeue_pkt(common, q_num);
252	if (skb == NULL) {
253	mutex_unlock(&common->tx_rxlock);
254	break;
255	}
256
257	if (q_num == MGMT_SOFT_Q)
258	status = rsi_send_mgmt_pkt(common, skb);
259	else
260	status = rsi_send_data_pkt(common, skb);
261
262	if (status) {
263	mutex_unlock(&common->tx_rxlock);
264	break;
265	}
266
267	common->tx_stats.total_tx_pkt_send[q_num]++;
268
269	tstamp_2 = jiffies;
270	mutex_unlock(&common->tx_rxlock);
271
272	if (tstamp_2 > tstamp_1 + (300 * HZ / 1000))
273	schedule();
274	}
275	}
276
277	/**
278	* rsi_core_xmit() - This function transmits the packets received from mac80211
279	* @common: Pointer to the driver private structure.
280	* @skb: Pointer to the socket buffer structure.
281	*
282	* Return: None.
283	*/
284	void rsi_core_xmit(struct rsi_common common, struct sk_buff skb)
285	{
286	struct rsi_hw *adapter = common->priv;
287	struct ieee80211_tx_info *info;
288	struct skb_info *tx_params;
289	struct ieee80211_hdr *tmp_hdr = NULL;
290	u8 q_num, tid = 0;
291
292	if ((!skb) \|\| (!skb->len)) {
293	rsi_dbg(ERR_ZONE, "%s: Null skb/zero Length packet\n",
294	__func__);
295	goto xmit_fail;
296	}
297	info = IEEE80211_SKB_CB(skb);
298	tx_params = (struct skb_info *)info->driver_data;
299	tmp_hdr = (struct ieee80211_hdr *)&skb->data[0];
300
301	if (common->fsm_state != FSM_MAC_INIT_DONE) {
302	rsi_dbg(ERR_ZONE, "%s: FSM state not open\n", __func__);
303	goto xmit_fail;
304	}
305
306	if ((ieee80211_is_mgmt(tmp_hdr->frame_control)) \|\|
307	(ieee80211_is_ctl(tmp_hdr->frame_control))) {
308	q_num = MGMT_SOFT_Q;
309	skb->priority = q_num;
310	} else {
311	if (ieee80211_is_data_qos(tmp_hdr->frame_control)) {
312	tid = (skb->data[24] & IEEE80211_QOS_TID);
313	skb->priority = TID_TO_WME_AC(tid);
314	} else {
315	tid = IEEE80211_NONQOS_TID;
316	skb->priority = BE_Q;
317	}
318	q_num = skb->priority;
319	tx_params->tid = tid;
320	tx_params->sta_id = 0;
321	}
322
323	if ((q_num != MGMT_SOFT_Q) &&
324	((skb_queue_len(&common->tx_queue[q_num]) + 1) >=
325	DATA_QUEUE_WATER_MARK)) {
326	if (!ieee80211_queue_stopped(adapter->hw, WME_AC(q_num)))
327	ieee80211_stop_queue(adapter->hw, WME_AC(q_num));
328	rsi_set_event(&common->tx_thread.event);
329	goto xmit_fail;
330	}
331
332	rsi_core_queue_pkt(common, skb);
333	rsi_dbg(DATA_TX_ZONE, "%s: ===> Scheduling TX thead <===\n", __func__);
334	rsi_set_event(&common->tx_thread.event);
335
336	return;
337
338	xmit_fail:
339	rsi_dbg(ERR_ZONE, "%s: Failed to queue packet\n", __func__);
340	/* Dropping pkt here */
341	ieee80211_free_txskb(common->priv->hw, skb);
342	}