Initial import

1 files changed, 362 insertions, 0 deletions

diff --git a/drivers/net/wireless/mwifiex/txrx.c b/drivers/net/wireless/mwifiex/txrx.c
new file mode 100644
index 000000000..a245f444a
--- /dev/null
+++ b/drivers/net/wireless/mwifiex/txrx.c
@@ -0,0 +1,362 @@
+/*
+ * Marvell Wireless LAN device driver: generic TX/RX data handling
+ *
+ * Copyright (C) 2011-2014, Marvell International Ltd.
+ *
+ * This software file (the "File") is distributed by Marvell International
+ * Ltd. under the terms of the GNU General Public License Version 2, June 1991
+ * (the "License").  You may use, redistribute and/or modify this File in
+ * accordance with the terms and conditions of the License, a copy of which
+ * is available by writing to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or on the
+ * worldwide web at http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
+ *
+ * THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
+ * ARE EXPRESSLY DISCLAIMED.  The License provides additional details about
+ * this warranty disclaimer.
+ */
+
+#include "decl.h"
+#include "ioctl.h"
+#include "util.h"
+#include "fw.h"
+#include "main.h"
+#include "wmm.h"
+
+/*
+ * This function processes the received buffer.
+ *
+ * Main responsibility of this function is to parse the RxPD to
+ * identify the correct interface this packet is headed for and
+ * forwarding it to the associated handling function, where the
+ * packet will be further processed and sent to kernel/upper layer
+ * if required.
+ */
+int mwifiex_handle_rx_packet(struct mwifiex_adapter *adapter,
+			     struct sk_buff *skb)
+{
+	struct mwifiex_private *priv =
+		mwifiex_get_priv(adapter, MWIFIEX_BSS_ROLE_ANY);
+	struct rxpd *local_rx_pd;
+	struct mwifiex_rxinfo *rx_info = MWIFIEX_SKB_RXCB(skb);
+	int ret;
+
+	local_rx_pd = (struct rxpd *) (skb->data);
+	/* Get the BSS number from rxpd, get corresponding priv */
+	priv = mwifiex_get_priv_by_id(adapter, local_rx_pd->bss_num &
+				      BSS_NUM_MASK, local_rx_pd->bss_type);
+	if (!priv)
+		priv = mwifiex_get_priv(adapter, MWIFIEX_BSS_ROLE_ANY);
+
+	if (!priv) {
+		dev_err(adapter->dev, "data: priv not found. Drop RX packet\n");
+		dev_kfree_skb_any(skb);
+		return -1;
+	}
+
+	memset(rx_info, 0, sizeof(*rx_info));
+	rx_info->bss_num = priv->bss_num;
+	rx_info->bss_type = priv->bss_type;
+
+	if (priv->bss_role == MWIFIEX_BSS_ROLE_UAP)
+		ret = mwifiex_process_uap_rx_packet(priv, skb);
+	else
+		ret = mwifiex_process_sta_rx_packet(priv, skb);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(mwifiex_handle_rx_packet);
+
+/*
+ * This function sends a packet to device.
+ *
+ * It processes the packet to add the TxPD, checks condition and
+ * sends the processed packet to firmware for transmission.
+ *
+ * On successful completion, the function calls the completion callback
+ * and logs the time.
+ */
+int mwifiex_process_tx(struct mwifiex_private *priv, struct sk_buff *skb,
+		       struct mwifiex_tx_param *tx_param)
+{
+	int hroom, ret = -1;
+	struct mwifiex_adapter *adapter = priv->adapter;
+	u8 *head_ptr;
+	struct txpd *local_tx_pd = NULL;
+
+	hroom = (adapter->iface_type == MWIFIEX_USB) ? 0 : INTF_HEADER_LEN;
+
+	if (priv->bss_role == MWIFIEX_BSS_ROLE_UAP)
+		head_ptr = mwifiex_process_uap_txpd(priv, skb);
+	else
+		head_ptr = mwifiex_process_sta_txpd(priv, skb);
+
+	if ((adapter->data_sent || adapter->tx_lock_flag) && head_ptr) {
+		skb_queue_tail(&adapter->tx_data_q, skb);
+		atomic_inc(&adapter->tx_queued);
+		return 0;
+	}
+
+	if (head_ptr) {
+		if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA)
+			local_tx_pd = (struct txpd *)(head_ptr + hroom);
+		if (adapter->iface_type == MWIFIEX_USB) {
+			adapter->data_sent = true;
+			ret = adapter->if_ops.host_to_card(adapter,
+							   MWIFIEX_USB_EP_DATA,
+							   skb, NULL);
+		} else {
+			ret = adapter->if_ops.host_to_card(adapter,
+							   MWIFIEX_TYPE_DATA,
+							   skb, tx_param);
+		}
+	}
+
+	switch (ret) {
+	case -ENOSR:
+		dev_dbg(adapter->dev, "data: -ENOSR is returned\n");
+		break;
+	case -EBUSY:
+		if ((GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA) &&
+		    (adapter->pps_uapsd_mode) && (adapter->tx_lock_flag)) {
+				priv->adapter->tx_lock_flag = false;
+				if (local_tx_pd)
+					local_tx_pd->flags = 0;
+		}
+		dev_dbg(adapter->dev, "data: -EBUSY is returned\n");
+		break;
+	case -1:
+		if (adapter->iface_type != MWIFIEX_PCIE)
+			adapter->data_sent = false;
+		dev_err(adapter->dev, "mwifiex_write_data_async failed: 0x%X\n",
+			ret);
+		adapter->dbg.num_tx_host_to_card_failure++;
+		mwifiex_write_data_complete(adapter, skb, 0, ret);
+		break;
+	case -EINPROGRESS:
+		if (adapter->iface_type != MWIFIEX_PCIE)
+			adapter->data_sent = false;
+		break;
+	case 0:
+		mwifiex_write_data_complete(adapter, skb, 0, ret);
+		break;
+	default:
+		break;
+	}
+
+	return ret;
+}
+
+static int mwifiex_host_to_card(struct mwifiex_adapter *adapter,
+				struct sk_buff *skb,
+				struct mwifiex_tx_param *tx_param)
+{
+	struct txpd *local_tx_pd = NULL;
+	u8 *head_ptr = skb->data;
+	int ret = 0;
+	struct mwifiex_private *priv;
+	struct mwifiex_txinfo *tx_info;
+
+	tx_info = MWIFIEX_SKB_TXCB(skb);
+	priv = mwifiex_get_priv_by_id(adapter, tx_info->bss_num,
+				      tx_info->bss_type);
+	if (!priv) {
+		dev_err(adapter->dev, "data: priv not found. Drop TX packet\n");
+		adapter->dbg.num_tx_host_to_card_failure++;
+		mwifiex_write_data_complete(adapter, skb, 0, 0);
+		return ret;
+	}
+	if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA) {
+		if (adapter->iface_type == MWIFIEX_USB)
+			local_tx_pd = (struct txpd *)head_ptr;
+		else
+			local_tx_pd = (struct txpd *) (head_ptr +
+				INTF_HEADER_LEN);
+	}
+
+	if (adapter->iface_type == MWIFIEX_USB) {
+		adapter->data_sent = true;
+		ret = adapter->if_ops.host_to_card(adapter,
+						   MWIFIEX_USB_EP_DATA,
+						   skb, NULL);
+	} else {
+		ret = adapter->if_ops.host_to_card(adapter,
+						   MWIFIEX_TYPE_DATA,
+						   skb, tx_param);
+	}
+	switch (ret) {
+	case -ENOSR:
+		dev_err(adapter->dev, "data: -ENOSR is returned\n");
+		break;
+	case -EBUSY:
+		if ((GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA) &&
+		    (adapter->pps_uapsd_mode) &&
+		    (adapter->tx_lock_flag)) {
+			priv->adapter->tx_lock_flag = false;
+			if (local_tx_pd)
+				local_tx_pd->flags = 0;
+		}
+		skb_queue_head(&adapter->tx_data_q, skb);
+		if (tx_info->flags & MWIFIEX_BUF_FLAG_AGGR_PKT)
+			atomic_add(tx_info->aggr_num, &adapter->tx_queued);
+		else
+			atomic_inc(&adapter->tx_queued);
+		dev_dbg(adapter->dev, "data: -EBUSY is returned\n");
+		break;
+	case -1:
+		if (adapter->iface_type != MWIFIEX_PCIE)
+			adapter->data_sent = false;
+		dev_err(adapter->dev, "mwifiex_write_data_async failed: 0x%X\n",
+			ret);
+		adapter->dbg.num_tx_host_to_card_failure++;
+		mwifiex_write_data_complete(adapter, skb, 0, ret);
+		break;
+	case -EINPROGRESS:
+		if (adapter->iface_type != MWIFIEX_PCIE)
+			adapter->data_sent = false;
+		break;
+	case 0:
+		mwifiex_write_data_complete(adapter, skb, 0, ret);
+		break;
+	default:
+		break;
+	}
+	return ret;
+}
+
+static int
+mwifiex_dequeue_tx_queue(struct mwifiex_adapter *adapter)
+{
+	struct sk_buff *skb, *skb_next;
+	struct mwifiex_txinfo *tx_info;
+	struct mwifiex_tx_param tx_param;
+
+	skb = skb_dequeue(&adapter->tx_data_q);
+	if (!skb)
+		return -1;
+
+	tx_info = MWIFIEX_SKB_TXCB(skb);
+	if (tx_info->flags & MWIFIEX_BUF_FLAG_AGGR_PKT)
+		atomic_sub(tx_info->aggr_num, &adapter->tx_queued);
+	else
+		atomic_dec(&adapter->tx_queued);
+
+	if (!skb_queue_empty(&adapter->tx_data_q))
+		skb_next = skb_peek(&adapter->tx_data_q);
+	else
+		skb_next = NULL;
+	tx_param.next_pkt_len = ((skb_next) ? skb_next->len : 0);
+	if (!tx_param.next_pkt_len) {
+		if (!mwifiex_wmm_lists_empty(adapter))
+			tx_param.next_pkt_len = 1;
+	}
+	return mwifiex_host_to_card(adapter, skb, &tx_param);
+}
+
+void
+mwifiex_process_tx_queue(struct mwifiex_adapter *adapter)
+{
+	do {
+		if (adapter->data_sent || adapter->tx_lock_flag)
+			break;
+		if (mwifiex_dequeue_tx_queue(adapter))
+			break;
+	} while (!skb_queue_empty(&adapter->tx_data_q));
+}
+
+/*
+ * Packet send completion callback handler.
+ *
+ * It either frees the buffer directly or forwards it to another
+ * completion callback which checks conditions, updates statistics,
+ * wakes up stalled traffic queue if required, and then frees the buffer.
+ */
+int mwifiex_write_data_complete(struct mwifiex_adapter *adapter,
+				struct sk_buff *skb, int aggr, int status)
+{
+	struct mwifiex_private *priv;
+	struct mwifiex_txinfo *tx_info;
+	struct netdev_queue *txq;
+	int index;
+
+	if (!skb)
+		return 0;
+
+	tx_info = MWIFIEX_SKB_TXCB(skb);
+	priv = mwifiex_get_priv_by_id(adapter, tx_info->bss_num,
+				      tx_info->bss_type);
+	if (!priv)
+		goto done;
+
+	if (adapter->iface_type == MWIFIEX_USB)
+		adapter->data_sent = false;
+
+	mwifiex_set_trans_start(priv->netdev);
+	if (!status) {
+		priv->stats.tx_packets++;
+		priv->stats.tx_bytes += tx_info->pkt_len;
+		if (priv->tx_timeout_cnt)
+			priv->tx_timeout_cnt = 0;
+	} else {
+		priv->stats.tx_errors++;
+	}
+
+	if (tx_info->flags & MWIFIEX_BUF_FLAG_BRIDGED_PKT) {
+		atomic_dec_return(&adapter->pending_bridged_pkts);
+		if (tx_info->flags & MWIFIEX_BUF_FLAG_AGGR_PKT)
+			goto done;
+	}
+
+	if (aggr)
+		/* For skb_aggr, do not wake up tx queue */
+		goto done;
+
+	atomic_dec(&adapter->tx_pending);
+
+	index = mwifiex_1d_to_wmm_queue[skb->priority];
+	if (atomic_dec_return(&priv->wmm_tx_pending[index]) < LOW_TX_PENDING) {
+		txq = netdev_get_tx_queue(priv->netdev, index);
+		if (netif_tx_queue_stopped(txq)) {
+			netif_tx_wake_queue(txq);
+			dev_dbg(adapter->dev, "wake queue: %d\n", index);
+		}
+	}
+done:
+	dev_kfree_skb_any(skb);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(mwifiex_write_data_complete);
+
+void mwifiex_parse_tx_status_event(struct mwifiex_private *priv,
+				   void *event_body)
+{
+	struct tx_status_event *tx_status = (void *)priv->adapter->event_body;
+	struct sk_buff *ack_skb;
+	unsigned long flags;
+	struct mwifiex_txinfo *tx_info;
+
+	if (!tx_status->tx_token_id)
+		return;
+
+	spin_lock_irqsave(&priv->ack_status_lock, flags);
+	ack_skb = idr_find(&priv->ack_status_frames, tx_status->tx_token_id);
+	if (ack_skb)
+		idr_remove(&priv->ack_status_frames, tx_status->tx_token_id);
+	spin_unlock_irqrestore(&priv->ack_status_lock, flags);
+
+	if (ack_skb) {
+		tx_info = MWIFIEX_SKB_TXCB(ack_skb);
+
+		if (tx_info->flags & MWIFIEX_BUF_FLAG_EAPOL_TX_STATUS) {
+			/* consumes ack_skb */
+			skb_complete_wifi_ack(ack_skb, !tx_status->status);
+		} else {
+			cfg80211_mgmt_tx_status(&priv->wdev, tx_info->cookie,
+						ack_skb->data, ack_skb->len,
+						!tx_status->status, GFP_ATOMIC);
+			dev_kfree_skb_any(ack_skb);
+		}
+	}
+}