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path: root/drivers/net/wireless/ath/ath9k/htc_drv_txrx.c
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Diffstat (limited to 'drivers/net/wireless/ath/ath9k/htc_drv_txrx.c')
-rw-r--r--drivers/net/wireless/ath/ath9k/htc_drv_txrx.c707
1 files changed, 707 insertions, 0 deletions
diff --git a/drivers/net/wireless/ath/ath9k/htc_drv_txrx.c b/drivers/net/wireless/ath/ath9k/htc_drv_txrx.c
new file mode 100644
index 00000000000..2571b443ac8
--- /dev/null
+++ b/drivers/net/wireless/ath/ath9k/htc_drv_txrx.c
@@ -0,0 +1,707 @@
+/*
+ * Copyright (c) 2010 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 */
+/******/
+
+int get_hw_qnum(u16 queue, int *hwq_map)
+{
+ switch (queue) {
+ case 0:
+ return hwq_map[ATH9K_WME_AC_VO];
+ case 1:
+ return hwq_map[ATH9K_WME_AC_VI];
+ case 2:
+ return hwq_map[ATH9K_WME_AC_BE];
+ case 3:
+ return hwq_map[ATH9K_WME_AC_BK];
+ default:
+ return hwq_map[ATH9K_WME_AC_BE];
+ }
+}
+
+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_print(ath9k_hw_common(ah), ATH_DBG_FATAL,
+ "Unable to update hardware queue %u!\n", qnum);
+ error = -EIO;
+ } else {
+ ath9k_hw_resettxqueue(ah, qnum);
+ }
+
+ return error;
+}
+
+int ath9k_htc_tx_start(struct ath9k_htc_priv *priv, struct sk_buff *skb)
+{
+ struct ieee80211_hdr *hdr;
+ struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
+ struct ieee80211_sta *sta = tx_info->control.sta;
+ struct ath9k_htc_sta *ista;
+ struct ath9k_htc_vif *avp;
+ struct ath9k_htc_tx_ctl tx_ctl;
+ enum htc_endpoint_id epid;
+ u16 qnum, hw_qnum;
+ __le16 fc;
+ u8 *tx_fhdr;
+ u8 sta_idx;
+
+ hdr = (struct ieee80211_hdr *) skb->data;
+ fc = hdr->frame_control;
+
+ avp = (struct ath9k_htc_vif *) tx_info->control.vif->drv_priv;
+ if (sta) {
+ ista = (struct ath9k_htc_sta *) sta->drv_priv;
+ sta_idx = ista->index;
+ } else {
+ sta_idx = 0;
+ }
+
+ memset(&tx_ctl, 0, sizeof(struct ath9k_htc_tx_ctl));
+
+ if (ieee80211_is_data(fc)) {
+ struct tx_frame_hdr tx_hdr;
+ u8 *qc;
+
+ memset(&tx_hdr, 0, sizeof(struct tx_frame_hdr));
+
+ tx_hdr.node_idx = sta_idx;
+ tx_hdr.vif_idx = avp->index;
+
+ 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;
+ }
+
+ if (ieee80211_is_data(fc)) {
+ 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)
+ tx_hdr.flags |= ATH9K_HTC_TX_RTSCTS;
+
+ /* CTS-to-self */
+ if (!(tx_hdr.flags & ATH9K_HTC_TX_RTSCTS) &&
+ (priv->op_flags & OP_PROTECT_ENABLE))
+ tx_hdr.flags |= ATH9K_HTC_TX_CTSONLY;
+
+ 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));
+
+ qnum = skb_get_queue_mapping(skb);
+ hw_qnum = get_hw_qnum(qnum, priv->hwq_map);
+
+ switch (hw_qnum) {
+ case 0:
+ epid = priv->data_be_ep;
+ break;
+ case 2:
+ epid = priv->data_vi_ep;
+ break;
+ case 3:
+ epid = priv->data_vo_ep;
+ break;
+ case 1:
+ default:
+ epid = priv->data_bk_ep;
+ break;
+ }
+ } else {
+ struct tx_mgmt_hdr mgmt_hdr;
+
+ memset(&mgmt_hdr, 0, sizeof(struct tx_mgmt_hdr));
+
+ tx_ctl.type = ATH9K_HTC_NORMAL;
+
+ mgmt_hdr.node_idx = sta_idx;
+ mgmt_hdr.vif_idx = avp->index;
+ mgmt_hdr.tidno = 0;
+ mgmt_hdr.flags = 0;
+
+ 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));
+ epid = priv->mgmt_ep;
+ }
+
+ return htc_send(priv->htc, skb, epid, &tx_ctl);
+}
+
+void ath9k_tx_tasklet(unsigned long data)
+{
+ struct ath9k_htc_priv *priv = (struct ath9k_htc_priv *)data;
+ struct ieee80211_sta *sta;
+ struct ieee80211_hdr *hdr;
+ struct ieee80211_tx_info *tx_info;
+ struct sk_buff *skb = NULL;
+ __le16 fc;
+
+ while ((skb = skb_dequeue(&priv->tx_queue)) != NULL) {
+
+ hdr = (struct ieee80211_hdr *) skb->data;
+ fc = hdr->frame_control;
+ tx_info = IEEE80211_SKB_CB(skb);
+
+ memset(&tx_info->status, 0, sizeof(tx_info->status));
+
+ rcu_read_lock();
+
+ sta = ieee80211_find_sta(priv->vif, hdr->addr1);
+ if (!sta) {
+ rcu_read_unlock();
+ ieee80211_tx_status(priv->hw, skb);
+ continue;
+ }
+
+ /* Check if we need to start aggregation */
+
+ if (sta && conf_is_ht(&priv->hw->conf) &&
+ (priv->op_flags & OP_TXAGGR)
+ && !(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 ((tid < ATH9K_HTC_MAX_TID) &&
+ ista->tid_state[tid] == AGGR_STOP) {
+ ieee80211_start_tx_ba_session(sta, tid);
+ ista->tid_state[tid] = AGGR_PROGRESS;
+ }
+ }
+ }
+
+ rcu_read_unlock();
+
+ /* Send status to mac80211 */
+ ieee80211_tx_status(priv->hw, skb);
+ }
+
+ /* Wake TX queues if needed */
+ spin_lock_bh(&priv->tx_lock);
+ if (priv->tx_queues_stop) {
+ priv->tx_queues_stop = false;
+ spin_unlock_bh(&priv->tx_lock);
+ ath_print(ath9k_hw_common(priv->ah), ATH_DBG_XMIT,
+ "Waking up TX queues\n");
+ ieee80211_wake_queues(priv->hw);
+ return;
+ }
+ spin_unlock_bh(&priv->tx_lock);
+}
+
+void ath9k_htc_txep(void *drv_priv, struct sk_buff *skb,
+ enum htc_endpoint_id ep_id, bool txok)
+{
+ struct ath9k_htc_priv *priv = (struct ath9k_htc_priv *) drv_priv;
+ struct ath_common *common = ath9k_hw_common(priv->ah);
+ struct ieee80211_tx_info *tx_info;
+
+ if (!skb)
+ return;
+
+ if (ep_id == priv->mgmt_ep) {
+ skb_pull(skb, sizeof(struct tx_mgmt_hdr));
+ } else if ((ep_id == priv->data_bk_ep) ||
+ (ep_id == priv->data_be_ep) ||
+ (ep_id == priv->data_vi_ep) ||
+ (ep_id == priv->data_vo_ep)) {
+ skb_pull(skb, sizeof(struct tx_frame_hdr));
+ } else {
+ ath_print(common, ATH_DBG_FATAL,
+ "Unsupported TX EPID: %d\n", ep_id);
+ dev_kfree_skb_any(skb);
+ return;
+ }
+
+ tx_info = IEEE80211_SKB_CB(skb);
+
+ if (txok)
+ tx_info->flags |= IEEE80211_TX_STAT_ACK;
+
+ skb_queue_tail(&priv->tx_queue, skb);
+ tasklet_schedule(&priv->tx_tasklet);
+}
+
+int ath9k_tx_init(struct ath9k_htc_priv *priv)
+{
+ skb_queue_head_init(&priv->tx_queue);
+ return 0;
+}
+
+void ath9k_tx_cleanup(struct ath9k_htc_priv *priv)
+{
+
+}
+
+bool ath9k_htc_txq_setup(struct ath9k_htc_priv *priv,
+ enum ath9k_tx_queue_subtype 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));
+
+ qi.tqi_subtype = 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;
+
+ qnum = ath9k_hw_setuptxqueue(priv->ah, ATH9K_TX_QUEUE_DATA, &qi);
+ if (qnum == -1)
+ return false;
+
+ if (qnum >= ARRAY_SIZE(priv->hwq_map)) {
+ ath_print(common, ATH_DBG_FATAL,
+ "qnum %u out of range, max %u!\n",
+ qnum, (unsigned int)ARRAY_SIZE(priv->hwq_map));
+ ath9k_hw_releasetxqueue(ah, qnum);
+ return false;
+ }
+
+ priv->hwq_map[subtype] = qnum;
+ return true;
+}
+
+/******/
+/* 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 not a STA, enable processing of Probe Requests */
+ if (ah->opmode != NL80211_IFTYPE_STATION)
+ rfilt |= ATH9K_RX_FILTER_PROBEREQ;
+
+ /*
+ * Set promiscuous mode when FIF_PROMISC_IN_BSS is enabled for station
+ * mode interface or when in monitor mode. AP mode does not need this
+ * since it receives all in-BSS frames anyway.
+ */
+ if (((ah->opmode != NL80211_IFTYPE_AP) &&
+ (priv->rxfilter & FIF_PROMISC_IN_BSS)) ||
+ (ah->opmode == NL80211_IFTYPE_MONITOR))
+ rfilt |= ATH9K_RX_FILTER_PROM;
+
+ if (priv->rxfilter & FIF_CONTROL)
+ rfilt |= ATH9K_RX_FILTER_CONTROL;
+
+ if ((ah->opmode == NL80211_IFTYPE_STATION) &&
+ !(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;
+
+ 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;
+ struct ath_common *common = ath9k_hw_common(ah);
+
+ u32 rfilt, mfilt[2];
+
+ /* configure rx filter */
+ rfilt = ath9k_htc_calcrxfilter(priv);
+ ath9k_hw_setrxfilter(ah, rfilt);
+
+ /* configure bssid mask */
+ if (ah->caps.hw_caps & ATH9K_HW_CAP_BSSIDMASK)
+ ath_hw_setbssidmask(common);
+
+ /* configure operational mode */
+ ath9k_hw_setopmode(ah);
+
+ /* Handle any link-level address change. */
+ ath9k_hw_setmac(ah, common->macaddr);
+
+ /* 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)
+{
+ ath9k_hw_rxena(priv->ah);
+ ath9k_htc_opmode_init(priv);
+ ath9k_hw_startpcureceive(priv->ah);
+ priv->rx.last_rssi = ATH_RSSI_DUMMY_MARKER;
+}
+
+static void ath9k_process_rate(struct ieee80211_hw *hw,
+ struct ieee80211_rx_status *rxs,
+ u8 rx_rate, u8 rs_flags)
+{
+ struct ieee80211_supported_band *sband;
+ enum ieee80211_band band;
+ unsigned int i = 0;
+
+ if (rx_rate & 0x80) {
+ /* HT rate */
+ rxs->flag |= RX_FLAG_HT;
+ if (rs_flags & ATH9K_RX_2040)
+ rxs->flag |= RX_FLAG_40MHZ;
+ if (rs_flags & ATH9K_RX_GI)
+ rxs->flag |= RX_FLAG_SHORT_GI;
+ rxs->rate_idx = rx_rate & 0x7f;
+ return;
+ }
+
+ band = hw->conf.channel->band;
+ sband = hw->wiphy->bands[band];
+
+ for (i = 0; i < sband->n_bitrates; i++) {
+ if (sband->bitrates[i].hw_value == rx_rate) {
+ rxs->rate_idx = i;
+ return;
+ }
+ if (sband->bitrates[i].hw_value_short == rx_rate) {
+ rxs->rate_idx = i;
+ rxs->flag |= RX_FLAG_SHORTPRE;
+ return;
+ }
+ }
+
+}
+
+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_htc_rx_status *rxstatus;
+ int hdrlen, padpos, padsize;
+ int last_rssi = ATH_RSSI_DUMMY_MARKER;
+ __le16 fc;
+
+ if (skb->len <= HTC_RX_FRAME_HEADER_SIZE) {
+ ath_print(common, ATH_DBG_FATAL,
+ "Corrupted RX frame, dropping\n");
+ goto rx_next;
+ }
+
+ rxstatus = (struct ath_htc_rx_status *)skb->data;
+
+ if (be16_to_cpu(rxstatus->rs_datalen) -
+ (skb->len - HTC_RX_FRAME_HEADER_SIZE) != 0) {
+ ath_print(common, ATH_DBG_FATAL,
+ "Corrupted RX data len, dropping "
+ "(dlen: %d, skblen: %d)\n",
+ rxstatus->rs_datalen, skb->len);
+ goto rx_next;
+ }
+
+ /* Get the RX status information */
+ memcpy(&rxbuf->rxstatus, rxstatus, HTC_RX_FRAME_HEADER_SIZE);
+ skb_pull(skb, HTC_RX_FRAME_HEADER_SIZE);
+
+ hdr = (struct ieee80211_hdr *)skb->data;
+ fc = hdr->frame_control;
+ hdrlen = ieee80211_get_hdrlen_from_skb(skb);
+
+ padpos = ath9k_cmn_padpos(fc);
+
+ padsize = padpos & 3;
+ if (padsize && skb->len >= padpos+padsize+FCS_LEN) {
+ memmove(skb->data + padsize, skb->data, padpos);
+ skb_pull(skb, padsize);
+ }
+
+ memset(rx_status, 0, sizeof(struct ieee80211_rx_status));
+
+ if (rxbuf->rxstatus.rs_status != 0) {
+ if (rxbuf->rxstatus.rs_status & ATH9K_RXERR_CRC)
+ rx_status->flag |= RX_FLAG_FAILED_FCS_CRC;
+ if (rxbuf->rxstatus.rs_status & ATH9K_RXERR_PHY)
+ goto rx_next;
+
+ if (rxbuf->rxstatus.rs_status & ATH9K_RXERR_DECRYPT) {
+ /* FIXME */
+ } else if (rxbuf->rxstatus.rs_status & ATH9K_RXERR_MIC) {
+ if (ieee80211_is_ctl(fc))
+ /*
+ * Sometimes, we get invalid
+ * MIC failures on valid control frames.
+ * Remove these mic errors.
+ */
+ rxbuf->rxstatus.rs_status &= ~ATH9K_RXERR_MIC;
+ else
+ rx_status->flag |= RX_FLAG_MMIC_ERROR;
+ }
+
+ /*
+ * Reject error frames with the exception of
+ * decryption and MIC failures. For monitor mode,
+ * we also ignore the CRC error.
+ */
+ if (priv->ah->opmode == NL80211_IFTYPE_MONITOR) {
+ if (rxbuf->rxstatus.rs_status &
+ ~(ATH9K_RXERR_DECRYPT | ATH9K_RXERR_MIC |
+ ATH9K_RXERR_CRC))
+ goto rx_next;
+ } else {
+ if (rxbuf->rxstatus.rs_status &
+ ~(ATH9K_RXERR_DECRYPT | ATH9K_RXERR_MIC)) {
+ goto rx_next;
+ }
+ }
+ }
+
+ if (!(rxbuf->rxstatus.rs_status & ATH9K_RXERR_DECRYPT)) {
+ u8 keyix;
+ keyix = rxbuf->rxstatus.rs_keyix;
+ if (keyix != ATH9K_RXKEYIX_INVALID) {
+ rx_status->flag |= RX_FLAG_DECRYPTED;
+ } else if (ieee80211_has_protected(fc) &&
+ skb->len >= hdrlen + 4) {
+ keyix = skb->data[hdrlen + 3] >> 6;
+ if (test_bit(keyix, common->keymap))
+ rx_status->flag |= RX_FLAG_DECRYPTED;
+ }
+ }
+
+ ath9k_process_rate(hw, rx_status, rxbuf->rxstatus.rs_rate,
+ rxbuf->rxstatus.rs_flags);
+
+ if (priv->op_flags & OP_ASSOCIATED) {
+ if (rxbuf->rxstatus.rs_rssi != ATH9K_RSSI_BAD &&
+ !rxbuf->rxstatus.rs_moreaggr)
+ ATH_RSSI_LPF(priv->rx.last_rssi,
+ rxbuf->rxstatus.rs_rssi);
+
+ last_rssi = priv->rx.last_rssi;
+
+ if (likely(last_rssi != ATH_RSSI_DUMMY_MARKER))
+ rxbuf->rxstatus.rs_rssi = ATH_EP_RND(last_rssi,
+ ATH_RSSI_EP_MULTIPLIER);
+
+ if (rxbuf->rxstatus.rs_rssi < 0)
+ rxbuf->rxstatus.rs_rssi = 0;
+
+ if (ieee80211_is_beacon(fc))
+ priv->ah->stats.avgbrssi = rxbuf->rxstatus.rs_rssi;
+ }
+
+ rx_status->mactime = be64_to_cpu(rxbuf->rxstatus.rs_tstamp);
+ rx_status->band = hw->conf.channel->band;
+ rx_status->freq = hw->conf.channel->center_freq;
+ rx_status->signal = rxbuf->rxstatus.rs_rssi + ATH_DEFAULT_NOISE_FLOOR;
+ rx_status->antenna = rxbuf->rxstatus.rs_antenna;
+ rx_status->flag |= RX_FLAG_TSFT;
+
+ return true;
+
+rx_next:
+ return false;
+}
+
+/*
+ * FIXME: Handle FLUSH later on.
+ */
+void ath9k_rx_tasklet(unsigned long data)
+{
+ struct ath9k_htc_priv *priv = (struct ath9k_htc_priv *)data;
+ 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 = (struct ath9k_htc_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;
+
+ spin_lock(&priv->rx.rxbuflock);
+ list_for_each_entry(tmp_buf, &priv->rx.rxbuf, list) {
+ if (!tmp_buf->in_process) {
+ rxbuf = tmp_buf;
+ break;
+ }
+ }
+ spin_unlock(&priv->rx.rxbuflock);
+
+ if (rxbuf == NULL) {
+ ath_print(common, ATH_DBG_ANY,
+ "No free RX buffer\n");
+ goto err;
+ }
+
+ spin_lock(&priv->rx.rxbuflock);
+ rxbuf->skb = skb;
+ rxbuf->in_process = true;
+ spin_unlock(&priv->rx.rxbuflock);
+
+ 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)
+{
+ struct ath_hw *ah = priv->ah;
+ struct ath_common *common = ath9k_hw_common(ah);
+ struct ath9k_htc_rxbuf *rxbuf;
+ int i = 0;
+
+ INIT_LIST_HEAD(&priv->rx.rxbuf);
+ spin_lock_init(&priv->rx.rxbuflock);
+
+ for (i = 0; i < ATH9K_HTC_RXBUF; i++) {
+ rxbuf = kzalloc(sizeof(struct ath9k_htc_rxbuf), GFP_KERNEL);
+ if (rxbuf == NULL) {
+ ath_print(common, ATH_DBG_FATAL,
+ "Unable to allocate RX buffers\n");
+ goto err;
+ }
+ list_add_tail(&rxbuf->list, &priv->rx.rxbuf);
+ }
+
+ return 0;
+
+err:
+ ath9k_rx_cleanup(priv);
+ return -ENOMEM;
+}