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linux-zen-desktop/drivers/net/wireless/ath/ath9k/htc_drv_txrx.c

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/*
* Copyright (c) 2010-2011 Atheros Communications 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 "htc.h"
/******/
/* TX */
/******/
static const int subtype_txq_to_hwq[] = {
[IEEE80211_AC_BE] = ATH_TXQ_AC_BE,
[IEEE80211_AC_BK] = ATH_TXQ_AC_BK,
[IEEE80211_AC_VI] = ATH_TXQ_AC_VI,
[IEEE80211_AC_VO] = ATH_TXQ_AC_VO,
};
#define ATH9K_HTC_INIT_TXQ(subtype) do { \
qi.tqi_subtype = subtype_txq_to_hwq[subtype]; \
qi.tqi_aifs = ATH9K_TXQ_USEDEFAULT; \
qi.tqi_cwmin = ATH9K_TXQ_USEDEFAULT; \
qi.tqi_cwmax = ATH9K_TXQ_USEDEFAULT; \
qi.tqi_physCompBuf = 0; \
qi.tqi_qflags = TXQ_FLAG_TXEOLINT_ENABLE | \
TXQ_FLAG_TXDESCINT_ENABLE; \
} while (0)
int get_hw_qnum(u16 queue, int *hwq_map)
{
switch (queue) {
case 0:
return hwq_map[IEEE80211_AC_VO];
case 1:
return hwq_map[IEEE80211_AC_VI];
case 2:
return hwq_map[IEEE80211_AC_BE];
case 3:
return hwq_map[IEEE80211_AC_BK];
default:
return hwq_map[IEEE80211_AC_BE];
}
}
void ath9k_htc_check_stop_queues(struct ath9k_htc_priv *priv)
{
spin_lock_bh(&priv->tx.tx_lock);
priv->tx.queued_cnt++;
if ((priv->tx.queued_cnt >= ATH9K_HTC_TX_THRESHOLD) &&
!(priv->tx.flags & ATH9K_HTC_OP_TX_QUEUES_STOP)) {
priv->tx.flags |= ATH9K_HTC_OP_TX_QUEUES_STOP;
ieee80211_stop_queues(priv->hw);
}
spin_unlock_bh(&priv->tx.tx_lock);
}
void ath9k_htc_check_wake_queues(struct ath9k_htc_priv *priv)
{
spin_lock_bh(&priv->tx.tx_lock);
if ((priv->tx.queued_cnt < ATH9K_HTC_TX_THRESHOLD) &&
(priv->tx.flags & ATH9K_HTC_OP_TX_QUEUES_STOP)) {
priv->tx.flags &= ~ATH9K_HTC_OP_TX_QUEUES_STOP;
ieee80211_wake_queues(priv->hw);
}
spin_unlock_bh(&priv->tx.tx_lock);
}
int ath9k_htc_tx_get_slot(struct ath9k_htc_priv *priv)
{
int slot;
spin_lock_bh(&priv->tx.tx_lock);
slot = find_first_zero_bit(priv->tx.tx_slot, MAX_TX_BUF_NUM);
if (slot >= MAX_TX_BUF_NUM) {
spin_unlock_bh(&priv->tx.tx_lock);
return -ENOBUFS;
}
__set_bit(slot, priv->tx.tx_slot);
spin_unlock_bh(&priv->tx.tx_lock);
return slot;
}
void ath9k_htc_tx_clear_slot(struct ath9k_htc_priv *priv, int slot)
{
spin_lock_bh(&priv->tx.tx_lock);
__clear_bit(slot, priv->tx.tx_slot);
spin_unlock_bh(&priv->tx.tx_lock);
}
static inline enum htc_endpoint_id get_htc_epid(struct ath9k_htc_priv *priv,
u16 qnum)
{
enum htc_endpoint_id epid;
switch (qnum) {
case 0:
TX_QSTAT_INC(priv, IEEE80211_AC_VO);
epid = priv->data_vo_ep;
break;
case 1:
TX_QSTAT_INC(priv, IEEE80211_AC_VI);
epid = priv->data_vi_ep;
break;
case 2:
TX_QSTAT_INC(priv, IEEE80211_AC_BE);
epid = priv->data_be_ep;
break;
case 3:
default:
TX_QSTAT_INC(priv, IEEE80211_AC_BK);
epid = priv->data_bk_ep;
break;
}
return epid;
}
static inline struct sk_buff_head*
get_htc_epid_queue(struct ath9k_htc_priv *priv, u8 epid)
{
struct ath_common *common = ath9k_hw_common(priv->ah);
struct sk_buff_head *epid_queue = NULL;
if (epid == priv->mgmt_ep)
epid_queue = &priv->tx.mgmt_ep_queue;
else if (epid == priv->cab_ep)
epid_queue = &priv->tx.cab_ep_queue;
else if (epid == priv->data_be_ep)
epid_queue = &priv->tx.data_be_queue;
else if (epid == priv->data_bk_ep)
epid_queue = &priv->tx.data_bk_queue;
else if (epid == priv->data_vi_ep)
epid_queue = &priv->tx.data_vi_queue;
else if (epid == priv->data_vo_ep)
epid_queue = &priv->tx.data_vo_queue;
else
ath_err(common, "Invalid EPID: %d\n", epid);
return epid_queue;
}
/*
* Removes the driver header and returns the TX slot number
*/
static inline int strip_drv_header(struct ath9k_htc_priv *priv,
struct sk_buff *skb)
{
struct ath_common *common = ath9k_hw_common(priv->ah);
struct ath9k_htc_tx_ctl *tx_ctl;
int slot;
tx_ctl = HTC_SKB_CB(skb);
if (tx_ctl->epid == priv->mgmt_ep) {
struct tx_mgmt_hdr *tx_mhdr =
(struct tx_mgmt_hdr *)skb->data;
slot = tx_mhdr->cookie;
skb_pull(skb, sizeof(struct tx_mgmt_hdr));
} else if ((tx_ctl->epid == priv->data_bk_ep) ||
(tx_ctl->epid == priv->data_be_ep) ||
(tx_ctl->epid == priv->data_vi_ep) ||
(tx_ctl->epid == priv->data_vo_ep) ||
(tx_ctl->epid == priv->cab_ep)) {
struct tx_frame_hdr *tx_fhdr =
(struct tx_frame_hdr *)skb->data;
slot = tx_fhdr->cookie;
skb_pull(skb, sizeof(struct tx_frame_hdr));
} else {
ath_err(common, "Unsupported EPID: %d\n", tx_ctl->epid);
slot = -EINVAL;
}
return slot;
}
int ath_htc_txq_update(struct ath9k_htc_priv *priv, int qnum,
struct ath9k_tx_queue_info *qinfo)
{
struct ath_hw *ah = priv->ah;
int error = 0;
struct ath9k_tx_queue_info qi;
ath9k_hw_get_txq_props(ah, qnum, &qi);
qi.tqi_aifs = qinfo->tqi_aifs;
qi.tqi_cwmin = qinfo->tqi_cwmin / 2; /* XXX */
qi.tqi_cwmax = qinfo->tqi_cwmax;
qi.tqi_burstTime = qinfo->tqi_burstTime;
qi.tqi_readyTime = qinfo->tqi_readyTime;
if (!ath9k_hw_set_txq_props(ah, qnum, &qi)) {
ath_err(ath9k_hw_common(ah),
"Unable to update hardware queue %u!\n", qnum);
error = -EIO;
} else {
ath9k_hw_resettxqueue(ah, qnum);
}
return error;
}
static void ath9k_htc_tx_mgmt(struct ath9k_htc_priv *priv,
struct ath9k_htc_vif *avp,
struct sk_buff *skb,
u8 sta_idx, u8 vif_idx, u8 slot)
{
struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
struct ieee80211_mgmt *mgmt;
struct ieee80211_hdr *hdr;
struct tx_mgmt_hdr mgmt_hdr;
struct ath9k_htc_tx_ctl *tx_ctl;
u8 *tx_fhdr;
tx_ctl = HTC_SKB_CB(skb);
hdr = (struct ieee80211_hdr *) skb->data;
memset(tx_ctl, 0, sizeof(*tx_ctl));
memset(&mgmt_hdr, 0, sizeof(struct tx_mgmt_hdr));
/*
* Set the TSF adjust value for probe response
* frame also.
*/
if (avp && unlikely(ieee80211_is_probe_resp(hdr->frame_control))) {
mgmt = (struct ieee80211_mgmt *)skb->data;
mgmt->u.probe_resp.timestamp = avp->tsfadjust;
}
tx_ctl->type = ATH9K_HTC_MGMT;
mgmt_hdr.node_idx = sta_idx;
mgmt_hdr.vif_idx = vif_idx;
mgmt_hdr.tidno = 0;
mgmt_hdr.flags = 0;
mgmt_hdr.cookie = slot;
mgmt_hdr.key_type = ath9k_cmn_get_hw_crypto_keytype(skb);
if (mgmt_hdr.key_type == ATH9K_KEY_TYPE_CLEAR)
mgmt_hdr.keyix = (u8) ATH9K_TXKEYIX_INVALID;
else
mgmt_hdr.keyix = tx_info->control.hw_key->hw_key_idx;
tx_fhdr = skb_push(skb, sizeof(mgmt_hdr));
memcpy(tx_fhdr, (u8 *) &mgmt_hdr, sizeof(mgmt_hdr));
tx_ctl->epid = priv->mgmt_ep;
}
static void ath9k_htc_tx_data(struct ath9k_htc_priv *priv,
struct ieee80211_vif *vif,
struct sk_buff *skb,
u8 sta_idx, u8 vif_idx, u8 slot,
bool is_cab)
{
struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
struct ieee80211_hdr *hdr;
struct ath9k_htc_tx_ctl *tx_ctl;
struct tx_frame_hdr tx_hdr;
u32 flags = 0;
u8 *qc, *tx_fhdr;
u16 qnum;
tx_ctl = HTC_SKB_CB(skb);
hdr = (struct ieee80211_hdr *) skb->data;
memset(tx_ctl, 0, sizeof(*tx_ctl));
memset(&tx_hdr, 0, sizeof(struct tx_frame_hdr));
tx_hdr.node_idx = sta_idx;
tx_hdr.vif_idx = vif_idx;
tx_hdr.cookie = slot;
/*
* This is a bit redundant but it helps to get
* the per-packet index quickly when draining the
* TX queue in the HIF layer. Otherwise we would
* have to parse the packet contents ...
*/
tx_ctl->sta_idx = sta_idx;
if (tx_info->flags & IEEE80211_TX_CTL_AMPDU) {
tx_ctl->type = ATH9K_HTC_AMPDU;
tx_hdr.data_type = ATH9K_HTC_AMPDU;
} else {
tx_ctl->type = ATH9K_HTC_NORMAL;
tx_hdr.data_type = ATH9K_HTC_NORMAL;
}
/* Transmit all frames that should not be reordered relative
* to each other using the same priority. For other QoS data
* frames extract the priority from the header.
*/
if (!(tx_info->control.flags & IEEE80211_TX_CTRL_DONT_REORDER) &&
ieee80211_is_data_qos(hdr->frame_control)) {
qc = ieee80211_get_qos_ctl(hdr);
tx_hdr.tidno = qc[0] & IEEE80211_QOS_CTL_TID_MASK;
}
/* Check for RTS protection */
if (priv->hw->wiphy->rts_threshold != (u32) -1)
if (skb->len > priv->hw->wiphy->rts_threshold)
flags |= ATH9K_HTC_TX_RTSCTS;
/* CTS-to-self */
if (!(flags & ATH9K_HTC_TX_RTSCTS) &&
(vif && vif->bss_conf.use_cts_prot))
flags |= ATH9K_HTC_TX_CTSONLY;
tx_hdr.flags = cpu_to_be32(flags);
tx_hdr.key_type = ath9k_cmn_get_hw_crypto_keytype(skb);
if (tx_hdr.key_type == ATH9K_KEY_TYPE_CLEAR)
tx_hdr.keyix = (u8) ATH9K_TXKEYIX_INVALID;
else
tx_hdr.keyix = tx_info->control.hw_key->hw_key_idx;
tx_fhdr = skb_push(skb, sizeof(tx_hdr));
memcpy(tx_fhdr, (u8 *) &tx_hdr, sizeof(tx_hdr));
if (is_cab) {
CAB_STAT_INC(priv);
tx_ctl->epid = priv->cab_ep;
return;
}
qnum = skb_get_queue_mapping(skb);
tx_ctl->epid = get_htc_epid(priv, qnum);
}
int ath9k_htc_tx_start(struct ath9k_htc_priv *priv,
struct ieee80211_sta *sta,
struct sk_buff *skb,
u8 slot, bool is_cab)
{
struct ieee80211_hdr *hdr;
struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
struct ieee80211_vif *vif = tx_info->control.vif;
struct ath9k_htc_sta *ista;
struct ath9k_htc_vif *avp = NULL;
u8 sta_idx, vif_idx;
hdr = (struct ieee80211_hdr *) skb->data;
/*
* Find out on which interface this packet has to be
* sent out.
*/
if (vif) {
avp = (struct ath9k_htc_vif *) vif->drv_priv;
vif_idx = avp->index;
} else {
if (!priv->ah->is_monitoring) {
ath_dbg(ath9k_hw_common(priv->ah), XMIT,
"VIF is null, but no monitor interface !\n");
return -EINVAL;
}
vif_idx = priv->mon_vif_idx;
}
/*
* Find out which station this packet is destined for.
*/
if (sta) {
ista = (struct ath9k_htc_sta *) sta->drv_priv;
sta_idx = ista->index;
} else {
sta_idx = priv->vif_sta_pos[vif_idx];
}
if (ieee80211_is_data(hdr->frame_control))
ath9k_htc_tx_data(priv, vif, skb,
sta_idx, vif_idx, slot, is_cab);
else
ath9k_htc_tx_mgmt(priv, avp, skb,
sta_idx, vif_idx, slot);
return htc_send(priv->htc, skb);
}
static inline bool __ath9k_htc_check_tx_aggr(struct ath9k_htc_priv *priv,
struct ath9k_htc_sta *ista, u8 tid)
{
bool ret = false;
spin_lock_bh(&priv->tx.tx_lock);
if ((tid < ATH9K_HTC_MAX_TID) && (ista->tid_state[tid] == AGGR_STOP))
ret = true;
spin_unlock_bh(&priv->tx.tx_lock);
return ret;
}
static void ath9k_htc_check_tx_aggr(struct ath9k_htc_priv *priv,
struct ieee80211_vif *vif,
struct sk_buff *skb)
{
struct ieee80211_sta *sta;
struct ieee80211_hdr *hdr;
__le16 fc;
hdr = (struct ieee80211_hdr *) skb->data;
fc = hdr->frame_control;
rcu_read_lock();
sta = ieee80211_find_sta(vif, hdr->addr1);
if (!sta) {
rcu_read_unlock();
return;
}
if (sta && conf_is_ht(&priv->hw->conf) &&
!(skb->protocol == cpu_to_be16(ETH_P_PAE))) {
if (ieee80211_is_data_qos(fc)) {
u8 *qc, tid;
struct ath9k_htc_sta *ista;
qc = ieee80211_get_qos_ctl(hdr);
tid = qc[0] & 0xf;
ista = (struct ath9k_htc_sta *)sta->drv_priv;
if (__ath9k_htc_check_tx_aggr(priv, ista, tid)) {
ieee80211_start_tx_ba_session(sta, tid, 0);
spin_lock_bh(&priv->tx.tx_lock);
ista->tid_state[tid] = AGGR_PROGRESS;
spin_unlock_bh(&priv->tx.tx_lock);
}
}
}
rcu_read_unlock();
}
static void ath9k_htc_tx_process(struct ath9k_htc_priv *priv,
struct sk_buff *skb,
struct __wmi_event_txstatus *txs)
{
struct ieee80211_vif *vif;
struct ath9k_htc_tx_ctl *tx_ctl;
struct ieee80211_tx_info *tx_info;
struct ieee80211_tx_rate *rate;
struct ieee80211_conf *cur_conf = &priv->hw->conf;
bool txok;
int slot;
int hdrlen, padsize;
slot = strip_drv_header(priv, skb);
if (slot < 0) {
dev_kfree_skb_any(skb);
return;
}
tx_ctl = HTC_SKB_CB(skb);
txok = tx_ctl->txok;
tx_info = IEEE80211_SKB_CB(skb);
vif = tx_info->control.vif;
rate = &tx_info->status.rates[0];
memset(&tx_info->status, 0, sizeof(tx_info->status));
/*
* URB submission failed for this frame, it never reached
* the target.
*/
if (!txok || !vif || !txs)
goto send_mac80211;
if (txs->ts_flags & ATH9K_HTC_TXSTAT_ACK) {
tx_info->flags |= IEEE80211_TX_STAT_ACK;
if (tx_info->flags & IEEE80211_TX_CTL_AMPDU)
tx_info->flags |= IEEE80211_TX_STAT_AMPDU;
}
if (txs->ts_flags & ATH9K_HTC_TXSTAT_FILT)
tx_info->flags |= IEEE80211_TX_STAT_TX_FILTERED;
if (txs->ts_flags & ATH9K_HTC_TXSTAT_RTC_CTS)
rate->flags |= IEEE80211_TX_RC_USE_RTS_CTS;
rate->count = 1;
rate->idx = MS(txs->ts_rate, ATH9K_HTC_TXSTAT_RATE);
if (txs->ts_flags & ATH9K_HTC_TXSTAT_MCS) {
rate->flags |= IEEE80211_TX_RC_MCS;
if (txs->ts_flags & ATH9K_HTC_TXSTAT_CW40)
rate->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
if (txs->ts_flags & ATH9K_HTC_TXSTAT_SGI)
rate->flags |= IEEE80211_TX_RC_SHORT_GI;
} else {
if (cur_conf->chandef.chan->band == NL80211_BAND_5GHZ)
rate->idx += 4; /* No CCK rates */
}
ath9k_htc_check_tx_aggr(priv, vif, skb);
send_mac80211:
spin_lock_bh(&priv->tx.tx_lock);
if (WARN_ON(--priv->tx.queued_cnt < 0))
priv->tx.queued_cnt = 0;
spin_unlock_bh(&priv->tx.tx_lock);
ath9k_htc_tx_clear_slot(priv, slot);
/* Remove padding before handing frame back to mac80211 */
hdrlen = ieee80211_get_hdrlen_from_skb(skb);
padsize = hdrlen & 3;
if (padsize && skb->len > hdrlen + padsize) {
memmove(skb->data + padsize, skb->data, hdrlen);
skb_pull(skb, padsize);
}
/* Send status to mac80211 */
ieee80211_tx_status(priv->hw, skb);
}
static inline void ath9k_htc_tx_drainq(struct ath9k_htc_priv *priv,
struct sk_buff_head *queue)
{
struct sk_buff *skb;
while ((skb = skb_dequeue(queue)) != NULL) {
ath9k_htc_tx_process(priv, skb, NULL);
}
}
void ath9k_htc_tx_drain(struct ath9k_htc_priv *priv)
{
struct ath9k_htc_tx_event *event, *tmp;
spin_lock_bh(&priv->tx.tx_lock);
priv->tx.flags |= ATH9K_HTC_OP_TX_DRAIN;
spin_unlock_bh(&priv->tx.tx_lock);
/*
* Ensure that all pending TX frames are flushed,
* and that the TX completion/failed tasklets is killed.
*/
htc_stop(priv->htc);
tasklet_kill(&priv->wmi->wmi_event_tasklet);
tasklet_kill(&priv->tx_failed_tasklet);
ath9k_htc_tx_drainq(priv, &priv->tx.mgmt_ep_queue);
ath9k_htc_tx_drainq(priv, &priv->tx.cab_ep_queue);
ath9k_htc_tx_drainq(priv, &priv->tx.data_be_queue);
ath9k_htc_tx_drainq(priv, &priv->tx.data_bk_queue);
ath9k_htc_tx_drainq(priv, &priv->tx.data_vi_queue);
ath9k_htc_tx_drainq(priv, &priv->tx.data_vo_queue);
ath9k_htc_tx_drainq(priv, &priv->tx.tx_failed);
/*
* The TX cleanup timer has already been killed.
*/
spin_lock_bh(&priv->wmi->event_lock);
list_for_each_entry_safe(event, tmp, &priv->wmi->pending_tx_events, list) {
list_del(&event->list);
kfree(event);
}
spin_unlock_bh(&priv->wmi->event_lock);
spin_lock_bh(&priv->tx.tx_lock);
priv->tx.flags &= ~ATH9K_HTC_OP_TX_DRAIN;
spin_unlock_bh(&priv->tx.tx_lock);
}
void ath9k_tx_failed_tasklet(struct tasklet_struct *t)
{
struct ath9k_htc_priv *priv = from_tasklet(priv, t, tx_failed_tasklet);
spin_lock(&priv->tx.tx_lock);
if (priv->tx.flags & ATH9K_HTC_OP_TX_DRAIN) {
spin_unlock(&priv->tx.tx_lock);
return;
}
spin_unlock(&priv->tx.tx_lock);
ath9k_htc_tx_drainq(priv, &priv->tx.tx_failed);
}
static inline bool check_cookie(struct ath9k_htc_priv *priv,
struct sk_buff *skb,
u8 cookie, u8 epid)
{
u8 fcookie = 0;
if (epid == priv->mgmt_ep) {
struct tx_mgmt_hdr *hdr;
hdr = (struct tx_mgmt_hdr *) skb->data;
fcookie = hdr->cookie;
} else if ((epid == priv->data_bk_ep) ||
(epid == priv->data_be_ep) ||
(epid == priv->data_vi_ep) ||
(epid == priv->data_vo_ep) ||
(epid == priv->cab_ep)) {
struct tx_frame_hdr *hdr;
hdr = (struct tx_frame_hdr *) skb->data;
fcookie = hdr->cookie;
}
if (fcookie == cookie)
return true;
return false;
}
static struct sk_buff* ath9k_htc_tx_get_packet(struct ath9k_htc_priv *priv,
struct __wmi_event_txstatus *txs)
{
struct ath_common *common = ath9k_hw_common(priv->ah);
struct sk_buff_head *epid_queue;
struct sk_buff *skb, *tmp;
unsigned long flags;
u8 epid = MS(txs->ts_rate, ATH9K_HTC_TXSTAT_EPID);
epid_queue = get_htc_epid_queue(priv, epid);
if (!epid_queue)
return NULL;
spin_lock_irqsave(&epid_queue->lock, flags);
skb_queue_walk_safe(epid_queue, skb, tmp) {
if (check_cookie(priv, skb, txs->cookie, epid)) {
__skb_unlink(skb, epid_queue);
spin_unlock_irqrestore(&epid_queue->lock, flags);
return skb;
}
}
spin_unlock_irqrestore(&epid_queue->lock, flags);
ath_dbg(common, XMIT, "No matching packet for cookie: %d, epid: %d\n",
txs->cookie, epid);
return NULL;
}
void ath9k_htc_txstatus(struct ath9k_htc_priv *priv, void *wmi_event)
{
struct wmi_event_txstatus *txs = wmi_event;
struct __wmi_event_txstatus *__txs;
struct sk_buff *skb;
struct ath9k_htc_tx_event *tx_pend;
int i;
for (i = 0; i < txs->cnt; i++) {
WARN_ON(txs->cnt > HTC_MAX_TX_STATUS);
__txs = &txs->txstatus[i];
skb = ath9k_htc_tx_get_packet(priv, __txs);
if (!skb) {
/*
* Store this event, so that the TX cleanup
* routine can check later for the needed packet.
*/
tx_pend = kzalloc(sizeof(struct ath9k_htc_tx_event),
GFP_ATOMIC);
if (!tx_pend)
continue;
memcpy(&tx_pend->txs, __txs,
sizeof(struct __wmi_event_txstatus));
spin_lock(&priv->wmi->event_lock);
list_add_tail(&tx_pend->list,
&priv->wmi->pending_tx_events);
spin_unlock(&priv->wmi->event_lock);
continue;
}
ath9k_htc_tx_process(priv, skb, __txs);
}
/* Wake TX queues if needed */
ath9k_htc_check_wake_queues(priv);
}
void ath9k_htc_txep(void *drv_priv, struct sk_buff *skb,
enum htc_endpoint_id ep_id, bool txok)
{
struct ath9k_htc_priv *priv = drv_priv;
struct ath9k_htc_tx_ctl *tx_ctl;
struct sk_buff_head *epid_queue;
tx_ctl = HTC_SKB_CB(skb);
tx_ctl->txok = txok;
tx_ctl->timestamp = jiffies;
if (!txok) {
skb_queue_tail(&priv->tx.tx_failed, skb);
tasklet_schedule(&priv->tx_failed_tasklet);
return;
}
epid_queue = get_htc_epid_queue(priv, ep_id);
if (!epid_queue) {
dev_kfree_skb_any(skb);
return;
}
skb_queue_tail(epid_queue, skb);
}
static inline bool check_packet(struct ath9k_htc_priv *priv, struct sk_buff *skb)
{
struct ath_common *common = ath9k_hw_common(priv->ah);
struct ath9k_htc_tx_ctl *tx_ctl;
tx_ctl = HTC_SKB_CB(skb);
if (time_after(jiffies,
tx_ctl->timestamp +
msecs_to_jiffies(ATH9K_HTC_TX_TIMEOUT_INTERVAL))) {
ath_dbg(common, XMIT, "Dropping a packet due to TX timeout\n");
return true;
}
return false;
}
static void ath9k_htc_tx_cleanup_queue(struct ath9k_htc_priv *priv,
struct sk_buff_head *epid_queue)
{
bool process = false;
unsigned long flags;
struct sk_buff *skb, *tmp;
struct sk_buff_head queue;
skb_queue_head_init(&queue);
spin_lock_irqsave(&epid_queue->lock, flags);
skb_queue_walk_safe(epid_queue, skb, tmp) {
if (check_packet(priv, skb)) {
__skb_unlink(skb, epid_queue);
__skb_queue_tail(&queue, skb);
process = true;
}
}
spin_unlock_irqrestore(&epid_queue->lock, flags);
if (process) {
skb_queue_walk_safe(&queue, skb, tmp) {
__skb_unlink(skb, &queue);
ath9k_htc_tx_process(priv, skb, NULL);
}
}
}
void ath9k_htc_tx_cleanup_timer(struct timer_list *t)
{
struct ath9k_htc_priv *priv = from_timer(priv, t, tx.cleanup_timer);
struct ath_common *common = ath9k_hw_common(priv->ah);
struct ath9k_htc_tx_event *event, *tmp;
struct sk_buff *skb;
spin_lock(&priv->wmi->event_lock);
list_for_each_entry_safe(event, tmp, &priv->wmi->pending_tx_events, list) {
skb = ath9k_htc_tx_get_packet(priv, &event->txs);
if (skb) {
ath_dbg(common, XMIT,
"Found packet for cookie: %d, epid: %d\n",
event->txs.cookie,
MS(event->txs.ts_rate, ATH9K_HTC_TXSTAT_EPID));
ath9k_htc_tx_process(priv, skb, &event->txs);
list_del(&event->list);
kfree(event);
continue;
}
if (++event->count >= ATH9K_HTC_TX_TIMEOUT_COUNT) {
list_del(&event->list);
kfree(event);
}
}
spin_unlock(&priv->wmi->event_lock);
/*
* Check if status-pending packets have to be cleaned up.
*/
ath9k_htc_tx_cleanup_queue(priv, &priv->tx.mgmt_ep_queue);
ath9k_htc_tx_cleanup_queue(priv, &priv->tx.cab_ep_queue);
ath9k_htc_tx_cleanup_queue(priv, &priv->tx.data_be_queue);
ath9k_htc_tx_cleanup_queue(priv, &priv->tx.data_bk_queue);
ath9k_htc_tx_cleanup_queue(priv, &priv->tx.data_vi_queue);
ath9k_htc_tx_cleanup_queue(priv, &priv->tx.data_vo_queue);
/* Wake TX queues if needed */
ath9k_htc_check_wake_queues(priv);
mod_timer(&priv->tx.cleanup_timer,
jiffies + msecs_to_jiffies(ATH9K_HTC_TX_CLEANUP_INTERVAL));
}
int ath9k_tx_init(struct ath9k_htc_priv *priv)
{
skb_queue_head_init(&priv->tx.mgmt_ep_queue);
skb_queue_head_init(&priv->tx.cab_ep_queue);
skb_queue_head_init(&priv->tx.data_be_queue);
skb_queue_head_init(&priv->tx.data_bk_queue);
skb_queue_head_init(&priv->tx.data_vi_queue);
skb_queue_head_init(&priv->tx.data_vo_queue);
skb_queue_head_init(&priv->tx.tx_failed);
/* Allow ath9k_wmi_event_tasklet(WMI_TXSTATUS_EVENTID) to operate. */
smp_wmb();
priv->tx.initialized = true;
return 0;
}
void ath9k_tx_cleanup(struct ath9k_htc_priv *priv)
{
}
bool ath9k_htc_txq_setup(struct ath9k_htc_priv *priv, int subtype)
{
struct ath_hw *ah = priv->ah;
struct ath_common *common = ath9k_hw_common(ah);
struct ath9k_tx_queue_info qi;
int qnum;
memset(&qi, 0, sizeof(qi));
ATH9K_HTC_INIT_TXQ(subtype);
qnum = ath9k_hw_setuptxqueue(priv->ah, ATH9K_TX_QUEUE_DATA, &qi);
if (qnum == -1)
return false;
if (qnum >= ARRAY_SIZE(priv->hwq_map)) {
ath_err(common, "qnum %u out of range, max %zu!\n",
qnum, ARRAY_SIZE(priv->hwq_map));
ath9k_hw_releasetxqueue(ah, qnum);
return false;
}
priv->hwq_map[subtype] = qnum;
return true;
}
int ath9k_htc_cabq_setup(struct ath9k_htc_priv *priv)
{
struct ath9k_tx_queue_info qi;
memset(&qi, 0, sizeof(qi));
ATH9K_HTC_INIT_TXQ(0);
return ath9k_hw_setuptxqueue(priv->ah, ATH9K_TX_QUEUE_CAB, &qi);
}
/******/
/* RX */
/******/
/*
* Calculate the RX filter to be set in the HW.
*/
u32 ath9k_htc_calcrxfilter(struct ath9k_htc_priv *priv)
{
#define RX_FILTER_PRESERVE (ATH9K_RX_FILTER_PHYERR | ATH9K_RX_FILTER_PHYRADAR)
struct ath_hw *ah = priv->ah;
u32 rfilt;
rfilt = (ath9k_hw_getrxfilter(ah) & RX_FILTER_PRESERVE)
| ATH9K_RX_FILTER_UCAST | ATH9K_RX_FILTER_BCAST
| ATH9K_RX_FILTER_MCAST;
if (priv->rxfilter & FIF_PROBE_REQ)
rfilt |= ATH9K_RX_FILTER_PROBEREQ;
if (ah->is_monitoring)
rfilt |= ATH9K_RX_FILTER_PROM;
if (priv->rxfilter & FIF_CONTROL)
rfilt |= ATH9K_RX_FILTER_CONTROL;
if ((ah->opmode == NL80211_IFTYPE_STATION) &&
(priv->nvifs <= 1) &&
!(priv->rxfilter & FIF_BCN_PRBRESP_PROMISC))
rfilt |= ATH9K_RX_FILTER_MYBEACON;
else
rfilt |= ATH9K_RX_FILTER_BEACON;
if (conf_is_ht(&priv->hw->conf)) {
rfilt |= ATH9K_RX_FILTER_COMP_BAR;
rfilt |= ATH9K_RX_FILTER_UNCOMP_BA_BAR;
}
if (priv->rxfilter & FIF_PSPOLL)
rfilt |= ATH9K_RX_FILTER_PSPOLL;
if (priv->nvifs > 1 ||
priv->rxfilter & (FIF_OTHER_BSS | FIF_MCAST_ACTION))
rfilt |= ATH9K_RX_FILTER_MCAST_BCAST_ALL;
return rfilt;
#undef RX_FILTER_PRESERVE
}
/*
* Recv initialization for opmode change.
*/
static void ath9k_htc_opmode_init(struct ath9k_htc_priv *priv)
{
struct ath_hw *ah = priv->ah;
u32 rfilt, mfilt[2];
/* configure rx filter */
rfilt = ath9k_htc_calcrxfilter(priv);
ath9k_hw_setrxfilter(ah, rfilt);
/* calculate and install multicast filter */
mfilt[0] = mfilt[1] = ~0;
ath9k_hw_setmcastfilter(ah, mfilt[0], mfilt[1]);
}
void ath9k_host_rx_init(struct ath9k_htc_priv *priv)
{
struct ath_common *common = ath9k_hw_common(priv->ah);
ath9k_hw_rxena(priv->ah);
ath9k_htc_opmode_init(priv);
ath9k_hw_startpcureceive(priv->ah, test_bit(ATH_OP_SCANNING, &common->op_flags));
}
static inline void convert_htc_flag(struct ath_rx_status *rx_stats,
struct ath_htc_rx_status *rxstatus)
{
rx_stats->enc_flags = 0;
rx_stats->bw = RATE_INFO_BW_20;
if (rxstatus->rs_flags & ATH9K_RX_2040)
rx_stats->bw = RATE_INFO_BW_40;
if (rxstatus->rs_flags & ATH9K_RX_GI)
rx_stats->enc_flags |= RX_ENC_FLAG_SHORT_GI;
}
static void rx_status_htc_to_ath(struct ath_rx_status *rx_stats,
struct ath_htc_rx_status *rxstatus)
{
rx_stats->rs_datalen = be16_to_cpu(rxstatus->rs_datalen);
rx_stats->rs_status = rxstatus->rs_status;
rx_stats->rs_phyerr = rxstatus->rs_phyerr;
rx_stats->rs_rssi = rxstatus->rs_rssi;
rx_stats->rs_keyix = rxstatus->rs_keyix;
rx_stats->rs_rate = rxstatus->rs_rate;
rx_stats->rs_antenna = rxstatus->rs_antenna;
rx_stats->rs_more = rxstatus->rs_more;
memcpy(rx_stats->rs_rssi_ctl, rxstatus->rs_rssi_ctl,
sizeof(rx_stats->rs_rssi_ctl));
memcpy(rx_stats->rs_rssi_ext, rxstatus->rs_rssi_ext,
sizeof(rx_stats->rs_rssi_ext));
rx_stats->rs_isaggr = rxstatus->rs_isaggr;
rx_stats->rs_moreaggr = rxstatus->rs_moreaggr;
rx_stats->rs_num_delims = rxstatus->rs_num_delims;
convert_htc_flag(rx_stats, rxstatus);
}
static bool ath9k_rx_prepare(struct ath9k_htc_priv *priv,
struct ath9k_htc_rxbuf *rxbuf,
struct ieee80211_rx_status *rx_status)
{
struct ieee80211_hdr *hdr;
struct ieee80211_hw *hw = priv->hw;
struct sk_buff *skb = rxbuf->skb;
struct ath_common *common = ath9k_hw_common(priv->ah);
struct ath_hw *ah = common->ah;
struct ath_htc_rx_status *rxstatus;
struct ath_rx_status rx_stats;
bool decrypt_error = false;
u16 rs_datalen;
bool is_phyerr;
if (skb->len < HTC_RX_FRAME_HEADER_SIZE) {
ath_err(common, "Corrupted RX frame, dropping (len: %d)\n",
skb->len);
goto rx_next;
}
rxstatus = (struct ath_htc_rx_status *)skb->data;
rs_datalen = be16_to_cpu(rxstatus->rs_datalen);
if (unlikely(rs_datalen -
(skb->len - HTC_RX_FRAME_HEADER_SIZE) != 0)) {
ath_err(common,
"Corrupted RX data len, dropping (dlen: %d, skblen: %d)\n",
rs_datalen, skb->len);
goto rx_next;
}
is_phyerr = rxstatus->rs_status & ATH9K_RXERR_PHY;
/*
* Discard zero-length packets and packets smaller than an ACK
* which are not PHY_ERROR (short radar pulses have a length of 3)
*/
if (unlikely(!rs_datalen || (rs_datalen < 10 && !is_phyerr))) {
ath_dbg(common, ANY,
"Short RX data len, dropping (dlen: %d)\n",
rs_datalen);
goto rx_next;
}
if (rxstatus->rs_keyix >= ATH_KEYMAX &&
rxstatus->rs_keyix != ATH9K_RXKEYIX_INVALID) {
ath_dbg(common, ANY,
"Invalid keyix, dropping (keyix: %d)\n",
rxstatus->rs_keyix);
goto rx_next;
}
/* Get the RX status information */
memset(rx_status, 0, sizeof(struct ieee80211_rx_status));
/* Copy everything from ath_htc_rx_status (HTC_RX_FRAME_HEADER).
* After this, we can drop this part of skb. */
rx_status_htc_to_ath(&rx_stats, rxstatus);
ath9k_htc_err_stat_rx(priv, &rx_stats);
rx_status->mactime = be64_to_cpu(rxstatus->rs_tstamp);
skb_pull(skb, HTC_RX_FRAME_HEADER_SIZE);
/*
* everything but the rate is checked here, the rate check is done
* separately to avoid doing two lookups for a rate for each frame.
*/
hdr = (struct ieee80211_hdr *)skb->data;
/*
* Process PHY errors and return so that the packet
* can be dropped.
*/
if (unlikely(is_phyerr)) {
/* TODO: Not using DFS processing now. */
if (ath_cmn_process_fft(&priv->spec_priv, hdr,
&rx_stats, rx_status->mactime)) {
/* TODO: Code to collect spectral scan statistics */
}
goto rx_next;
}
if (!ath9k_cmn_rx_accept(common, hdr, rx_status, &rx_stats,
&decrypt_error, priv->rxfilter))
goto rx_next;
ath9k_cmn_rx_skb_postprocess(common, skb, &rx_stats,
rx_status, decrypt_error);
if (ath9k_cmn_process_rate(common, hw, &rx_stats, rx_status))
goto rx_next;
rx_stats.is_mybeacon = ath_is_mybeacon(common, hdr);
ath9k_cmn_process_rssi(common, hw, &rx_stats, rx_status);
rx_status->band = ah->curchan->chan->band;
rx_status->freq = ah->curchan->chan->center_freq;
rx_status->antenna = rx_stats.rs_antenna;
rx_status->flag |= RX_FLAG_MACTIME_END;
return true;
rx_next:
return false;
}
/*
* FIXME: Handle FLUSH later on.
*/
void ath9k_rx_tasklet(struct tasklet_struct *t)
{
struct ath9k_htc_priv *priv = from_tasklet(priv, t, rx_tasklet);
struct ath9k_htc_rxbuf *rxbuf = NULL, *tmp_buf = NULL;
struct ieee80211_rx_status rx_status;
struct sk_buff *skb;
unsigned long flags;
struct ieee80211_hdr *hdr;
do {
spin_lock_irqsave(&priv->rx.rxbuflock, flags);
list_for_each_entry(tmp_buf, &priv->rx.rxbuf, list) {
if (tmp_buf->in_process) {
rxbuf = tmp_buf;
break;
}
}
if (rxbuf == NULL) {
spin_unlock_irqrestore(&priv->rx.rxbuflock, flags);
break;
}
if (!rxbuf->skb)
goto requeue;
if (!ath9k_rx_prepare(priv, rxbuf, &rx_status)) {
dev_kfree_skb_any(rxbuf->skb);
goto requeue;
}
memcpy(IEEE80211_SKB_RXCB(rxbuf->skb), &rx_status,
sizeof(struct ieee80211_rx_status));
skb = rxbuf->skb;
hdr = (struct ieee80211_hdr *) skb->data;
if (ieee80211_is_beacon(hdr->frame_control) && priv->ps_enabled)
ieee80211_queue_work(priv->hw, &priv->ps_work);
spin_unlock_irqrestore(&priv->rx.rxbuflock, flags);
ieee80211_rx(priv->hw, skb);
spin_lock_irqsave(&priv->rx.rxbuflock, flags);
requeue:
rxbuf->in_process = false;
rxbuf->skb = NULL;
list_move_tail(&rxbuf->list, &priv->rx.rxbuf);
rxbuf = NULL;
spin_unlock_irqrestore(&priv->rx.rxbuflock, flags);
} while (1);
}
void ath9k_htc_rxep(void *drv_priv, struct sk_buff *skb,
enum htc_endpoint_id ep_id)
{
struct ath9k_htc_priv *priv = drv_priv;
struct ath_hw *ah = priv->ah;
struct ath_common *common = ath9k_hw_common(ah);
struct ath9k_htc_rxbuf *rxbuf = NULL, *tmp_buf = NULL;
unsigned long flags;
/* Check if ath9k_rx_init() completed. */
if (!data_race(priv->rx.initialized))
goto err;
spin_lock_irqsave(&priv->rx.rxbuflock, flags);
list_for_each_entry(tmp_buf, &priv->rx.rxbuf, list) {
if (!tmp_buf->in_process) {
rxbuf = tmp_buf;
break;
}
}
spin_unlock_irqrestore(&priv->rx.rxbuflock, flags);
if (rxbuf == NULL) {
ath_dbg(common, ANY, "No free RX buffer\n");
goto err;
}
spin_lock_irqsave(&priv->rx.rxbuflock, flags);
rxbuf->skb = skb;
rxbuf->in_process = true;
spin_unlock_irqrestore(&priv->rx.rxbuflock, flags);
tasklet_schedule(&priv->rx_tasklet);
return;
err:
dev_kfree_skb_any(skb);
}
/* FIXME: Locking for cleanup/init */
void ath9k_rx_cleanup(struct ath9k_htc_priv *priv)
{
struct ath9k_htc_rxbuf *rxbuf, *tbuf;
list_for_each_entry_safe(rxbuf, tbuf, &priv->rx.rxbuf, list) {
list_del(&rxbuf->list);
if (rxbuf->skb)
dev_kfree_skb_any(rxbuf->skb);
kfree(rxbuf);
}
}
int ath9k_rx_init(struct ath9k_htc_priv *priv)
{
int i = 0;
INIT_LIST_HEAD(&priv->rx.rxbuf);
spin_lock_init(&priv->rx.rxbuflock);
for (i = 0; i < ATH9K_HTC_RXBUF; i++) {
struct ath9k_htc_rxbuf *rxbuf =
kzalloc(sizeof(struct ath9k_htc_rxbuf), GFP_KERNEL);
if (rxbuf == NULL)
goto err;
list_add_tail(&rxbuf->list, &priv->rx.rxbuf);
}
/* Allow ath9k_htc_rxep() to operate. */
smp_wmb();
priv->rx.initialized = true;
return 0;
err:
ath9k_rx_cleanup(priv);
return -ENOMEM;
}
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