/* * 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.
*/
/** * 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
*/ staticbool 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; struct ieee80211_hdr *wh; struct ieee80211_vif *vif;
if (skb_queue_len(&common->tx_queue[q_num]))
skb = skb_peek(&common->tx_queue[q_num]); else return 0;
do {
wh = (struct ieee80211_hdr *)skb->data;
vif = rsi_get_vif(adapter, wh->addr2);
r_txop = ieee80211_generic_frame_duration(adapter->hw,
vif,
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_BEACON_Q])) {
q_num = MGMT_BEACON_Q; return q_num;
} 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;
/** * 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.
*/ staticvoid 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.
*/ staticstruct 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; unsignedlong 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;
} if (common->hibernate_resume) break;
mutex_lock(&common->tx_lock);
status = adapter->check_hw_queue_status(adapter, q_num); if ((status <= 0)) {
mutex_unlock(&common->tx_lock); 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_lock); break;
} if (q_num == MGMT_BEACON_Q) {
status = rsi_send_pkt_to_bus(common, skb);
dev_kfree_skb(skb);
} else { #ifdef CONFIG_RSI_COEX if (common->coex_mode > 1) {
status = rsi_coex_send_pkt(common, skb,
RSI_WLAN_Q);
} else { #endif if (q_num == MGMT_SOFT_Q)
status = rsi_send_mgmt_pkt(common, skb); else
status = rsi_send_data_pkt(common, skb); #ifdef CONFIG_RSI_COEX
} #endif
}
if (status) {
mutex_unlock(&common->tx_lock); break;
}
struct rsi_sta *rsi_find_sta(struct rsi_common *common, u8 *mac_addr)
{ int i;
for (i = 0; i < common->max_stations; i++) { if (!common->stations[i].sta) continue; if (!(memcmp(common->stations[i].sta->addr,
mac_addr, ETH_ALEN))) return &common->stations[i];
} return NULL;
}
for (i = 0; i < RSI_MAX_VIFS; i++) {
vif = adapter->vifs[i]; if (!vif) continue; if (!memcmp(vif->addr, mac, ETH_ALEN)) return vif;
} return NULL;
}
/** * 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 *wh = NULL; struct ieee80211_vif *vif;
u8 q_num, tid = 0; struct rsi_sta *rsta = NULL;
if ((!skb) || (!skb->len)) {
rsi_dbg(ERR_ZONE, "%s: Null skb/zero Length packet\n",
__func__); goto xmit_fail;
} if (common->fsm_state != FSM_MAC_INIT_DONE) {
rsi_dbg(ERR_ZONE, "%s: FSM state not open\n", __func__); goto xmit_fail;
} if (common->wow_flags & RSI_WOW_ENABLED) {
rsi_dbg(ERR_ZONE, "%s: Blocking Tx_packets when WOWLAN is enabled\n",
__func__); goto xmit_fail;
}
info = IEEE80211_SKB_CB(skb);
tx_params = (struct skb_info *)info->driver_data; /* info->driver_data and info->control part of union so make copy */
tx_params->have_key = !!info->control.hw_key;
wh = (struct ieee80211_hdr *)&skb->data[0];
tx_params->sta_id = 0;
if (rsta) { /* Start aggregation if not done for this tid */ if (!rsta->start_tx_aggr[tid]) {
rsta->start_tx_aggr[tid] = true;
ieee80211_start_tx_ba_session(rsta->sta,
tid, 0);
}
}
if (IEEE80211_SKB_CB(skb)->control.flags &
IEEE80211_TX_CTRL_PORT_CTRL_PROTO) {
q_num = MGMT_SOFT_Q;
skb->priority = q_num;
} if (rsi_prepare_data_desc(common, skb)) {
rsi_dbg(ERR_ZONE, "Failed to prepare data desc\n"); goto xmit_fail;
}
}
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