diff options
Diffstat (limited to 'drivers/net/wireless/rsi/rsi_91x_core.c')
-rw-r--r-- | drivers/net/wireless/rsi/rsi_91x_core.c | 501 |
1 files changed, 501 insertions, 0 deletions
diff --git a/drivers/net/wireless/rsi/rsi_91x_core.c b/drivers/net/wireless/rsi/rsi_91x_core.c new file mode 100644 index 0000000000..ead4d4e043 --- /dev/null +++ b/drivers/net/wireless/rsi/rsi_91x_core.c @@ -0,0 +1,501 @@ +/* + * 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; + + return INVALID_QUEUE; + } + + 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 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; + } + + 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; + /* 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; + + 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, vif->cfg.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 (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; + } + } + + 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); +} |