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This patch adds the Redpine Signals' 91x wireless driver. Signed-off-by: Fariya Fatima <fariyaf@gmail.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
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config RSI_91X | ||
tristate "Redpine Signals Inc 91x WLAN driver support" | ||
depends on MAC80211 | ||
---help--- | ||
This option enabes support for RSI 1x1 devices. | ||
Select M (recommended), if you have a RSI 1x1 wireless module. | ||
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config RSI_DEBUGFS | ||
bool "Redpine Signals Inc debug support" | ||
depends on RSI_91X | ||
default y | ||
---help--- | ||
Say Y, if you would like to enable debug support. This option | ||
creates debugfs entries | ||
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config RSI_SDIO | ||
tristate "Redpine Signals SDIO bus support" | ||
depends on MMC && RSI_91X | ||
default m | ||
---help--- | ||
This option enables the SDIO bus support in rsi drivers. | ||
Select M (recommended), if you have a RSI 1x1 wireless module. | ||
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config RSI_USB | ||
tristate "Redpine Signals USB bus support" | ||
depends on USB && RSI_91X | ||
default m | ||
---help--- | ||
This option enables the USB bus support in rsi drivers. | ||
Select M (recommended), if you have a RSI 1x1 wireless module. |
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rsi_91x-y += rsi_91x_main.o | ||
rsi_91x-y += rsi_91x_core.o | ||
rsi_91x-y += rsi_91x_mac80211.o | ||
rsi_91x-y += rsi_91x_mgmt.o | ||
rsi_91x-y += rsi_91x_pkt.o | ||
rsi_91x-$(CONFIG_RSI_DEBUGFS) += rsi_91x_debugfs.o | ||
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rsi_usb-y += rsi_91x_usb.o rsi_91x_usb_ops.o | ||
rsi_sdio-y += rsi_91x_sdio.o rsi_91x_sdio_ops.o | ||
obj-$(CONFIG_RSI_91X) += rsi_91x.o | ||
obj-$(CONFIG_RSI_SDIO) += rsi_sdio.o | ||
obj-$(CONFIG_RSI_USB) += rsi_usb.o |
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/** | ||
* 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. | ||
*/ | ||
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#include "rsi_mgmt.h" | ||
#include "rsi_common.h" | ||
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/** | ||
* 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; | ||
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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; | ||
} | ||
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/** | ||
* 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; | ||
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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; | ||
} | ||
} | ||
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return recontend_queue; | ||
} | ||
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/** | ||
* 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; | ||
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if (skb_queue_len(&common->tx_queue[MGMT_SOFT_Q])) { | ||
if (!common->mgmt_q_block) | ||
q_num = MGMT_SOFT_Q; | ||
return q_num; | ||
} | ||
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if (common->pkt_cnt != 0) { | ||
--common->pkt_cnt; | ||
return common->selected_qnum; | ||
} | ||
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get_queue_num: | ||
q_num = 0; | ||
recontend_queue = false; | ||
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q_num = rsi_determine_min_weight_queue(common); | ||
q_len = skb_queue_len(&common->tx_queue[ii]); | ||
ii = q_num; | ||
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/* 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; | ||
} | ||
} | ||
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common->tx_qinfo[q_num].pkt_contended = 0; | ||
/* Adjust the back off values for all queues again */ | ||
recontend_queue = rsi_recalculate_weights(common); | ||
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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; | ||
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q_num = INVALID_QUEUE; | ||
return q_num; | ||
} | ||
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common->selected_qnum = q_num; | ||
q_len = skb_queue_len(&common->tx_queue[q_num]); | ||
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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; | ||
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case VI_Q: | ||
if (q_len > MAX_CONTINUOUS_VI_PKTS) | ||
common->pkt_cnt = (MAX_CONTINUOUS_VI_PKTS - 1); | ||
else | ||
common->pkt_cnt = --q_len; | ||
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break; | ||
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default: | ||
common->pkt_cnt = 0; | ||
break; | ||
} | ||
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return q_num; | ||
} | ||
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/** | ||
* 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; | ||
} | ||
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skb_queue_tail(&common->tx_queue[q_num], skb); | ||
} | ||
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/** | ||
* 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; | ||
} | ||
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return skb_dequeue(&common->tx_queue[q_num]); | ||
} | ||
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/** | ||
* 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; | ||
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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); | ||
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if (q_num == INVALID_QUEUE) { | ||
rsi_dbg(DATA_TX_ZONE, "%s: No More Pkt\n", __func__); | ||
break; | ||
} | ||
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mutex_lock(&common->tx_rxlock); | ||
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status = adapter->check_hw_queue_status(adapter, q_num); | ||
if ((status <= 0)) { | ||
mutex_unlock(&common->tx_rxlock); | ||
break; | ||
} | ||
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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)); | ||
} | ||
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skb = rsi_core_dequeue_pkt(common, q_num); | ||
if (skb == NULL) { | ||
mutex_unlock(&common->tx_rxlock); | ||
break; | ||
} | ||
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if (q_num == MGMT_SOFT_Q) | ||
status = rsi_send_mgmt_pkt(common, skb); | ||
else | ||
status = rsi_send_data_pkt(common, skb); | ||
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if (status) { | ||
mutex_unlock(&common->tx_rxlock); | ||
break; | ||
} | ||
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common->tx_stats.total_tx_pkt_send[q_num]++; | ||
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tstamp_2 = jiffies; | ||
mutex_unlock(&common->tx_rxlock); | ||
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if (tstamp_2 > tstamp_1 + (300 * HZ / 1000)) | ||
schedule(); | ||
} | ||
} | ||
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/** | ||
* 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; | ||
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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]; | ||
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if (common->fsm_state != FSM_MAC_INIT_DONE) { | ||
rsi_dbg(ERR_ZONE, "%s: FSM state not open\n", __func__); | ||
goto xmit_fail; | ||
} | ||
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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; | ||
} | ||
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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; | ||
} | ||
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rsi_core_queue_pkt(common, skb); | ||
rsi_dbg(DATA_TX_ZONE, "%s: ===> Scheduling TX thead <===\n", __func__); | ||
rsi_set_event(&common->tx_thread.event); | ||
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return; | ||
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xmit_fail: | ||
rsi_dbg(ERR_ZONE, "%s: Failed to queue packet\n", __func__); | ||
/* Dropping pkt here */ | ||
ieee80211_free_txskb(common->priv->hw, skb); | ||
} |
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