/**
* 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"
#include "rsi_hal.h"
#include "rsi_coex.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;
struct ieee80211_hdr *wh;
struct ieee80211_vif *vif;
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 {
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;
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;
}
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 [31mCONFIG_RSI_COEX[0m
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 [31mCONFIG_RSI_COEX[0m
}
#endif
}
if (status) {
mutex_unlock(&common->tx_lock);
break;
}
common->tx_stats.total_tx_pkt_send[q_num]++;
tstamp_2 = jiffies;
mutex_unlock(&common->tx_lock);
if (time_after(tstamp_2, tstamp_1 + (300 * HZ) / 1000))
schedule();
}
}
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;
}
struct ieee80211_vif *rsi_get_vif(struct rsi_hw *adapter, u8 *mac)
{
struct ieee80211_vif *vif;
int i;
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;
wh = (struct ieee80211_hdr *)&skb->data[0];
tx_params->sta_id = 0;
vif = rsi_get_vif(adapter, wh->addr2);
if (!vif)
goto xmit_fail;
tx_params->vif = vif;
tx_params->vap_id = ((struct vif_priv *)vif->drv_priv)->vap_id;
if ((ieee80211_is_mgmt(wh->frame_control)) ||
(ieee80211_is_ctl(wh->frame_control)) ||
(ieee80211_is_qos_nullfunc(wh->frame_control))) {
if (ieee80211_is_assoc_req(wh->frame_control) ||
ieee80211_is_reassoc_req(wh->frame_control)) {
struct ieee80211_bss_conf *bss = &vif->bss_conf;
common->eapol4_confirm = false;
rsi_hal_send_sta_notify_frame(common,
RSI_IFTYPE_STATION,
STA_CONNECTED, bss->bssid,
bss->qos, bss->aid, 0,
vif);
}
q_num = MGMT_SOFT_Q;
skb->priority = q_num;
if (rsi_prepare_mgmt_desc(common, skb)) {
rsi_dbg(ERR_ZONE, "Failed to prepare desc\n");
goto xmit_fail;
}
} else {
if (ieee80211_is_data_qos(wh->frame_control)) {
u8 *qos = ieee80211_get_qos_ctl(wh);
tid = *qos & IEEE80211_QOS_CTL_TID_MASK;
skb->priority = TID_TO_WME_AC(tid);
} else {
tid = IEEE80211_NONQOS_TID;
skb->priority = BE_Q;
}
q_num = skb->priority;
tx_params->tid = tid;
if (((vif->type == NL80211_IFTYPE_AP) ||
(vif->type == NL80211_IFTYPE_P2P_GO)) &&
(!is_broadcast_ether_addr(wh->addr1)) &&
(!is_multicast_ether_addr(wh->addr1))) {
rsta = rsi_find_sta(common, wh->addr1);
if (!rsta)
goto xmit_fail;
tx_params->sta_id = rsta->sta_id;
} else {
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 (skb->protocol == cpu_to_be16(ETH_P_PAE)) {
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;
}
}
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 thread <===\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);
}