--- /dev/null
+/**
+ * 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_get_num_pkts_dequeue() - This function determines the number of
+ * packets to be dequeued based on the number
+ * of bytes calculated using txop.
+ *
+ * @common: Pointer to the driver private structure.
+ * @q_num: the queue from which pkts have to be dequeued
+ *
+ * Return: pkt_num: Number of pkts to be dequeued.
+ */
+static u32 rsi_get_num_pkts_dequeue(struct rsi_common *common, u8 q_num)
+{
+ struct rsi_hw *adapter = common->priv;
+ struct sk_buff *skb;
+ u32 pkt_cnt = 0;
+ s16 txop = common->tx_qinfo[q_num].txop * 32;
+ __le16 r_txop;
+ struct ieee80211_rate rate;
+
+ rate.bitrate = RSI_RATE_MCS0 * 5 * 10; /* Convert to Kbps */
+ if (q_num == VI_Q)
+ txop = ((txop << 5) / 80);
+
+ if (skb_queue_len(&common->tx_queue[q_num]))
+ skb = skb_peek(&common->tx_queue[q_num]);
+ else
+ return 0;
+
+ do {
+ r_txop = ieee80211_generic_frame_duration(adapter->hw,
+ adapter->vifs[0],
+ common->band,
+ skb->len, &rate);
+ txop -= le16_to_cpu(r_txop);
+ pkt_cnt += 1;
+ /*checking if pkts are still there*/
+ if (skb_queue_len(&common->tx_queue[q_num]) - pkt_cnt)
+ skb = skb->next;
+ else
+ break;
+
+ } while (txop > 0);
+
+ return pkt_cnt;
+}
+
+/**
+ * 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 = 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->hw_data_qs_blocked)
+ return q_num;
+
+ if (common->pkt_cnt != 0) {
+ --common->pkt_cnt;
+ return common->selected_qnum;
+ }
+
+get_queue_num:
+ recontend_queue = false;
+
+ q_num = rsi_determine_min_weight_queue(common);
+
+ ii = q_num;
+
+ /* Selecting the queue with least back off */
+ for (; ii < NUM_EDCA_QUEUES; ii++) {
+ q_len = skb_queue_len(&common->tx_queue[ii]);
+ if (((common->tx_qinfo[ii].pkt_contended) &&
+ (common->tx_qinfo[ii].weight < common->min_weight)) &&
+ q_len) {
+ common->min_weight = common->tx_qinfo[ii].weight;
+ q_num = ii;
+ }
+ }
+
+ if (q_num < NUM_EDCA_QUEUES)
+ 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]);
+
+ if (q_num == VO_Q || q_num == VI_Q) {
+ common->pkt_cnt = rsi_get_num_pkts_dequeue(common, q_num);
+ common->pkt_cnt -= 1;
+ }
+
+ 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) {
+ rsi_dbg(ERR_ZONE, "skb null\n");
+ 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)) ||
+ (ieee80211_is_qos_nullfunc(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)) {
+ rsi_dbg(ERR_ZONE, "%s: sw queue full\n", __func__);
+ 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);
+}
Code Review / kvmfornfv.git / blobdiff