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path: root/drivers/net/wireless/mwifiex/txrx.c
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Diffstat (limited to 'drivers/net/wireless/mwifiex/txrx.c')
-rw-r--r--drivers/net/wireless/mwifiex/txrx.c202
1 files changed, 202 insertions, 0 deletions
diff --git a/drivers/net/wireless/mwifiex/txrx.c b/drivers/net/wireless/mwifiex/txrx.c
new file mode 100644
index 000000000000..f06923cb1c4b
--- /dev/null
+++ b/drivers/net/wireless/mwifiex/txrx.c
@@ -0,0 +1,202 @@
+/*
+ * Marvell Wireless LAN device driver: generic TX/RX data handling
+ *
+ * Copyright (C) 2011, 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)
+{
+ int ret = 0;
+ 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);
+
+ 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);
+
+ rx_info->bss_index = priv->bss_index;
+ ret = mwifiex_process_sta_rx_packet(adapter, 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 ret = -1;
+ struct mwifiex_adapter *adapter = priv->adapter;
+ u8 *head_ptr = NULL;
+ struct txpd *local_tx_pd = NULL;
+
+ head_ptr = (u8 *) mwifiex_process_sta_txpd(priv, skb);
+ if (head_ptr) {
+ if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA)
+ local_tx_pd =
+ (struct txpd *) (head_ptr + INTF_HEADER_LEN);
+
+ ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_TYPE_DATA,
+ skb->data, skb->len, tx_param);
+ }
+
+ switch (ret) {
+ 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;
+ local_tx_pd->flags = 0;
+ }
+ dev_dbg(adapter->dev, "data: -EBUSY is returned\n");
+ break;
+ case -1:
+ 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, ret);
+ break;
+ case -EINPROGRESS:
+ adapter->data_sent = false;
+ break;
+ case 0:
+ mwifiex_write_data_complete(adapter, skb, ret);
+ break;
+ default:
+ break;
+ }
+
+ return ret;
+}
+
+/*
+ * 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 status)
+{
+ struct mwifiex_private *priv = NULL, *tpriv = NULL;
+ struct mwifiex_txinfo *tx_info = NULL;
+ int i;
+
+ if (!skb)
+ return 0;
+
+ tx_info = MWIFIEX_SKB_TXCB(skb);
+ priv = mwifiex_bss_index_to_priv(adapter, tx_info->bss_index);
+ if (!priv)
+ goto done;
+
+ priv->netdev->trans_start = jiffies;
+ if (!status) {
+ priv->stats.tx_packets++;
+ priv->stats.tx_bytes += skb->len;
+ } else {
+ priv->stats.tx_errors++;
+ }
+ atomic_dec(&adapter->tx_pending);
+
+ for (i = 0; i < adapter->priv_num; i++) {
+
+ tpriv = adapter->priv[i];
+
+ if ((GET_BSS_ROLE(tpriv) == MWIFIEX_BSS_ROLE_STA)
+ && (tpriv->media_connected)) {
+ if (netif_queue_stopped(tpriv->netdev))
+ netif_wake_queue(tpriv->netdev);
+ }
+ }
+done:
+ dev_kfree_skb_any(skb);
+
+ return 0;
+}
+
+/*
+ * Packet receive completion callback handler.
+ *
+ * This function calls another completion callback handler which
+ * updates the statistics, and optionally updates the parent buffer
+ * use count before freeing the received packet.
+ */
+int mwifiex_recv_packet_complete(struct mwifiex_adapter *adapter,
+ struct sk_buff *skb, int status)
+{
+ struct mwifiex_rxinfo *rx_info = MWIFIEX_SKB_RXCB(skb);
+ struct mwifiex_rxinfo *rx_info_parent = NULL;
+ struct mwifiex_private *priv;
+ struct sk_buff *skb_parent = NULL;
+ unsigned long flags;
+
+ priv = adapter->priv[rx_info->bss_index];
+
+ if (priv && (status == -1))
+ priv->stats.rx_dropped++;
+
+ if (rx_info->parent) {
+ skb_parent = rx_info->parent;
+ rx_info_parent = MWIFIEX_SKB_RXCB(skb_parent);
+
+ spin_lock_irqsave(&priv->rx_pkt_lock, flags);
+ --rx_info_parent->use_count;
+
+ if (!rx_info_parent->use_count) {
+ spin_unlock_irqrestore(&priv->rx_pkt_lock, flags);
+ dev_kfree_skb_any(skb_parent);
+ } else {
+ spin_unlock_irqrestore(&priv->rx_pkt_lock, flags);
+ }
+ } else {
+ dev_kfree_skb_any(skb);
+ }
+
+ return 0;
+}