Adding txrx.c
Signed-off-by: Eugene Krasnikov <k.eugene.e@xxxxxxxxx>
---
drivers/net/wireless/ath/wcn36xx/txrx.c | 261 ++++++++++++++++++++++++++++++++
1 file changed, 261 insertions(+)
create mode 100644 drivers/net/wireless/ath/wcn36xx/txrx.c
diff --git a/drivers/net/wireless/ath/wcn36xx/txrx.c b/drivers/net/wireless/ath/wcn36xx/txrx.c
new file mode 100644
index 0000000..54fb86e
--- /dev/null
+++ b/drivers/net/wireless/ath/wcn36xx/txrx.c
@@ -0,0 +1,261 @@
+/*
+ * Copyright (c) 2013 Eugene Krasnikov <k.eugene.e@xxxxxxxxx>
+ *
+ * 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 "txrx.h"
+
+static inline int get_rssi0(struct wcn36xx_rx_bd *bd)
+{
+ return 100 - ((bd->phy_stat0 >> 24) & 0xff);
+}
+
+int wcn36xx_rx_skb(struct wcn36xx *wcn, struct sk_buff *skb)
+{
+ struct ieee80211_rx_status status;
+ struct ieee80211_hdr *hdr;
+ struct wcn36xx_rx_bd *bd;
+ u16 fc, sn;
+
+ /*
+ * All fields must be 0, otherwise it can lead to
+ * unexpected consequences.
+ */
+ memset(&status, 0, sizeof(status));
+
+ bd = (struct wcn36xx_rx_bd *)skb->data;
+ buff_to_be((u32 *)bd, sizeof(*bd)/sizeof(u32));
+ wcn36xx_dbg_dump(WCN36XX_DBG_RX_DUMP,
+ "BD <<< ", (char *)bd,
+ sizeof(struct wcn36xx_rx_bd));
+
+ skb_put(skb, bd->pdu.mpdu_header_off + bd->pdu.mpdu_len);
+ skb_pull(skb, bd->pdu.mpdu_header_off);
+
+ status.mactime = 10;
+ status.freq = WCN36XX_CENTER_FREQ(wcn);
+ status.band = WCN36XX_BAND(wcn);
+ status.signal = -get_rssi0(bd);
+ status.antenna = 1;
+ status.rate_idx = 1;
+ status.flag = 0;
+ status.rx_flags = 0;
+ status.flag |= RX_FLAG_IV_STRIPPED |
+ RX_FLAG_MMIC_STRIPPED |
+ RX_FLAG_DECRYPTED;
+
+ wcn36xx_dbg(WCN36XX_DBG_RX, "status.flags=%x status->vendor_radiotap_len=%x",
+ status.flag, status.vendor_radiotap_len);
+
+ memcpy(IEEE80211_SKB_RXCB(skb), &status, sizeof(status));
+
+ hdr = (struct ieee80211_hdr *) skb->data;
+ fc = __le16_to_cpu(hdr->frame_control);
+ sn = IEEE80211_SEQ_TO_SN(__le16_to_cpu(hdr->seq_ctrl));
+
+ if (ieee80211_is_beacon(hdr->frame_control)) {
+ wcn36xx_dbg(WCN36XX_DBG_BEACON, "beacon skb %p len %d fc %04x sn %d",
+ skb, skb->len, fc, sn);
+ wcn36xx_dbg_dump(WCN36XX_DBG_BEACON_DUMP, "SKB <<< ",
+ (char *)skb->data, skb->len);
+ } else {
+ wcn36xx_dbg(WCN36XX_DBG_RX, "rx skb %p len %d fc %04x sn %d",
+ skb, skb->len, fc, sn);
+ wcn36xx_dbg_dump(WCN36XX_DBG_RX_DUMP, "SKB <<< ",
+ (char *)skb->data, skb->len);
+ }
+
+ ieee80211_rx_irqsafe(wcn->hw, skb);
+
+ return 0;
+}
+
+static void wcn36xx_set_tx_pdu(struct wcn36xx_tx_bd *bd,
+ u32 mpdu_header_len,
+ u32 len,
+ u16 tid)
+{
+ bd->pdu.mpdu_header_len = mpdu_header_len;
+ bd->pdu.mpdu_header_off = sizeof(*bd);
+ bd->pdu.mpdu_data_off = bd->pdu.mpdu_header_len +
+ bd->pdu.mpdu_header_off;
+ bd->pdu.mpdu_len = len;
+ bd->pdu.tid = tid;
+}
+
+static void wcn36xx_set_tx_data(struct wcn36xx_tx_bd *bd,
+ struct wcn36xx *wcn,
+ struct wcn36xx_sta *sta_priv,
+ struct ieee80211_hdr *hdr,
+ bool bcast)
+{
+ struct ieee80211_vif *vif = container_of((void *)wcn->current_vif,
+ struct ieee80211_vif,
+ drv_priv);
+ bd->bd_rate = WCN36XX_BD_RATE_DATA;
+ bd->dpu_sign = wcn->current_vif->ucast_dpu_signature;
+
+ /*
+ * For not unicast frames mac80211 will not set sta pointer so use
+ * self_sta_index instead.
+ */
+ if (sta_priv) {
+ if (vif->type == NL80211_IFTYPE_STATION) {
+ bd->sta_index = sta_priv->bss_sta_index;
+ bd->dpu_desc_idx = sta_priv->bss_dpu_desc_index;
+ } else if (vif->type == NL80211_IFTYPE_AP ||
+ vif->type == NL80211_IFTYPE_ADHOC ||
+ vif->type == NL80211_IFTYPE_MESH_POINT) {
+ bd->sta_index = sta_priv->sta_index;
+ bd->dpu_desc_idx = sta_priv->dpu_desc_index;
+ }
+ } else {
+ bd->sta_index = wcn->current_vif->self_sta_index;
+ bd->dpu_desc_idx = wcn->current_vif->self_dpu_desc_index;
+ }
+
+ if (ieee80211_is_nullfunc(hdr->frame_control) ||
+ (sta_priv && !sta_priv->is_data_encrypted))
+ bd->dpu_ne = 1;
+
+ if (bcast) {
+ bd->ub = 1;
+ bd->ack_policy = 1;
+ }
+}
+
+static void wcn36xx_set_tx_mgmt(struct wcn36xx_tx_bd *bd,
+ struct wcn36xx *wcn,
+ struct ieee80211_hdr *hdr,
+ bool bcast)
+{
+ bd->sta_index = wcn->current_vif->self_sta_index;
+ bd->dpu_desc_idx = wcn->current_vif->self_dpu_desc_index;
+ bd->dpu_ne = 1;
+
+ /* default rate for unicast */
+ if (ieee80211_is_mgmt(hdr->frame_control))
+ bd->bd_rate = (WCN36XX_BAND(wcn) == IEEE80211_BAND_5GHZ) ?
+ WCN36XX_BD_RATE_CTRL :
+ WCN36XX_BD_RATE_MGMT;
+ else if (ieee80211_is_ctl(hdr->frame_control))
+ bd->bd_rate = WCN36XX_BD_RATE_CTRL;
+ else
+ wcn36xx_warn("frame control type unknown");
+
+ /*
+ * In joining state trick hardware that probe is sent as
+ * unicast even if address is broadcast.
+ */
+ if (wcn->is_joining &&
+ ieee80211_is_probe_req(hdr->frame_control))
+ bcast = false;
+
+ if (bcast) {
+ /* broadcast */
+ bd->ub = 1;
+ /* No ack needed not unicast */
+ bd->ack_policy = 1;
+ bd->queue_id = WCN36XX_TX_B_WQ_ID;
+ } else
+ bd->queue_id = WCN36XX_TX_U_WQ_ID;
+}
+
+int wcn36xx_start_tx(struct wcn36xx *wcn,
+ struct wcn36xx_sta *sta_priv,
+ struct sk_buff *skb)
+{
+ struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
+ struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
+ unsigned long flags;
+ bool is_low = ieee80211_is_data(hdr->frame_control);
+ bool bcast = is_broadcast_ether_addr(hdr->addr1) ||
+ is_multicast_ether_addr(hdr->addr1);
+ struct wcn36xx_tx_bd *bd = wcn36xx_dxe_get_next_bd(wcn, is_low);
+
+ if (!bd) {
+ /*
+ * TX DXE are used in pairs. One for the BD and one for the
+ * actual frame. The BD DXE's has a preallocated buffer while
+ * the skb ones does not. If this isn't true something is really
+ * wierd. TODO: Recover from this situation
+ */
+
+ wcn36xx_error("bd address may not be NULL for BD DXE");
+ return -EINVAL;
+ }
+
+ memset(bd, 0, sizeof(*bd));
+
+ wcn36xx_dbg(WCN36XX_DBG_TX,
+ "tx skb %p len %d fc %04x sn %d %s %s",
+ skb, skb->len, __le16_to_cpu(hdr->frame_control),
+ IEEE80211_SEQ_TO_SN(__le16_to_cpu(hdr->seq_ctrl)),
+ is_low ? "low" : "high", bcast ? "bcast" : "ucast");
+
+ wcn36xx_dbg_dump(WCN36XX_DBG_TX_DUMP, "", skb->data, skb->len);
+
+ bd->dpu_rf = WCN36XX_BMU_WQ_TX;
+
+ bd->tx_comp = info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS;
+ if (bd->tx_comp) {
+ wcn36xx_dbg(WCN36XX_DBG_DXE, "TX_ACK status requested");
+ spin_lock_irqsave(&wcn->dxe_lock, flags);
+ if (wcn->tx_ack_skb) {
+ spin_unlock_irqrestore(&wcn->dxe_lock, flags);
+ wcn36xx_warn("tx_ack_skb already set");
+ ieee80211_free_txskb(wcn->hw, skb);
+ return -EINVAL;
+ }
+
+ wcn->tx_ack_skb = skb;
+ spin_unlock_irqrestore(&wcn->dxe_lock, flags);
+
+ /* Only one at a time is supported by fw. Stop the TX queues
+ * until the ack status gets back.
+ *
+ * TODO: Add watchdog in case FW does not answer
+ */
+ ieee80211_stop_queues(wcn->hw);
+ }
+
+ /* Data frames served first*/
+ if (is_low) {
+ /*
+ * Sometimes in AP mode mac80211 is trying to send data
+ * frame to nobody. Why?
+ */
+ if (!sta_priv)
+ wcn36xx_warn("Sending data packet to nobody");
+ wcn36xx_set_tx_data(bd, wcn, sta_priv, hdr, bcast);
+ wcn36xx_set_tx_pdu(bd,
+ ieee80211_is_data_qos(hdr->frame_control) ?
+ sizeof(struct ieee80211_qos_hdr) :
+ sizeof(struct ieee80211_hdr_3addr),
+ skb->len, sta_priv ? sta_priv->tid : 0);
+ } else {
+ /* MGMT and CTRL frames are handeld here*/
+ wcn36xx_set_tx_mgmt(bd, wcn, hdr, bcast);
+ wcn36xx_set_tx_pdu(bd,
+ ieee80211_is_data_qos(hdr->frame_control) ?
+ sizeof(struct ieee80211_qos_hdr) :
+ sizeof(struct ieee80211_hdr_3addr),
+ skb->len, WCN36XX_TID);
+ }
+
+ buff_to_be((u32 *)bd, sizeof(*bd)/sizeof(u32));
+ bd->tx_bd_sign = 0xbdbdbdbd;
+
+ return wcn36xx_dxe_tx_frame(wcn, skb, is_low);
+}
--
1.8.2.2
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