1/*
  2 * Marvell Wireless LAN device driver: generic TX/RX data handling
  3 *
  4 * Copyright (C) 2011, Marvell International Ltd.
  5 *
  6 * This software file (the "File") is distributed by Marvell International
  7 * Ltd. under the terms of the GNU General Public License Version 2, June 1991
  8 * (the "License").  You may use, redistribute and/or modify this File in
  9 * accordance with the terms and conditions of the License, a copy of which
 10 * is available by writing to the Free Software Foundation, Inc.,
 11 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or on the
 12 * worldwide web at http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
 13 *
 14 * THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE
 15 * IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
 16 * ARE EXPRESSLY DISCLAIMED.  The License provides additional details about
 17 * this warranty disclaimer.
 18 */
 19
 20#include "decl.h"
 21#include "ioctl.h"
 22#include "util.h"
 23#include "fw.h"
 24#include "main.h"
 25#include "wmm.h"
 26
 27/*
 28 * This function processes the received buffer.
 29 *
 30 * Main responsibility of this function is to parse the RxPD to
 31 * identify the correct interface this packet is headed for and
 32 * forwarding it to the associated handling function, where the
 33 * packet will be further processed and sent to kernel/upper layer
 34 * if required.
 35 */
 36int mwifiex_handle_rx_packet(struct mwifiex_adapter *adapter,
 37			     struct sk_buff *skb)
 38{
 39	struct mwifiex_private *priv =
 40		mwifiex_get_priv(adapter, MWIFIEX_BSS_ROLE_ANY);
 41	struct rxpd *local_rx_pd;
 42	struct mwifiex_rxinfo *rx_info = MWIFIEX_SKB_RXCB(skb);
 43
 44	local_rx_pd = (struct rxpd *) (skb->data);
 45	/* Get the BSS number from rxpd, get corresponding priv */
 46	priv = mwifiex_get_priv_by_id(adapter, local_rx_pd->bss_num &
 47				      BSS_NUM_MASK, local_rx_pd->bss_type);
 48	if (!priv)
 49		priv = mwifiex_get_priv(adapter, MWIFIEX_BSS_ROLE_ANY);
 50
 51	rx_info->bss_num = priv->bss_num;
 52	rx_info->bss_type = priv->bss_type;
 53
 54	return mwifiex_process_sta_rx_packet(adapter, skb);
 55}
 56EXPORT_SYMBOL_GPL(mwifiex_handle_rx_packet);
 57
 58/*
 59 * This function sends a packet to device.
 60 *
 61 * It processes the packet to add the TxPD, checks condition and
 62 * sends the processed packet to firmware for transmission.
 63 *
 64 * On successful completion, the function calls the completion callback
 65 * and logs the time.
 66 */
 67int mwifiex_process_tx(struct mwifiex_private *priv, struct sk_buff *skb,
 68		       struct mwifiex_tx_param *tx_param)
 69{
 70	int ret = -1;
 71	struct mwifiex_adapter *adapter = priv->adapter;
 72	u8 *head_ptr;
 73	struct txpd *local_tx_pd = NULL;
 74
 75	head_ptr = mwifiex_process_sta_txpd(priv, skb);
 76	if (head_ptr) {
 77		if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA)
 78			local_tx_pd =
 79				(struct txpd *) (head_ptr + INTF_HEADER_LEN);
 80		if (adapter->iface_type == MWIFIEX_USB) {
 81			adapter->data_sent = true;
 82			skb_pull(skb, INTF_HEADER_LEN);
 83			ret = adapter->if_ops.host_to_card(adapter,
 84							   MWIFIEX_USB_EP_DATA,
 85							   skb, NULL);
 86		} else {
 87			ret = adapter->if_ops.host_to_card(adapter,
 88							   MWIFIEX_TYPE_DATA,
 89							   skb, tx_param);
 90		}
 91	}
 92
 93	switch (ret) {
 94	case -ENOSR:
 95		dev_err(adapter->dev, "data: -ENOSR is returned\n");
 96		break;
 97	case -EBUSY:
 98		if ((GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA) &&
 99		    (adapter->pps_uapsd_mode) && (adapter->tx_lock_flag)) {
100				priv->adapter->tx_lock_flag = false;
101				if (local_tx_pd)
102					local_tx_pd->flags = 0;
103		}
104		dev_dbg(adapter->dev, "data: -EBUSY is returned\n");
105		break;
106	case -1:
107		adapter->data_sent = false;
108		dev_err(adapter->dev, "mwifiex_write_data_async failed: 0x%X\n",
109			ret);
110		adapter->dbg.num_tx_host_to_card_failure++;
111		mwifiex_write_data_complete(adapter, skb, ret);
112		break;
113	case -EINPROGRESS:
114		adapter->data_sent = false;
115		break;
116	case 0:
117		mwifiex_write_data_complete(adapter, skb, ret);
118		break;
119	default:
120		break;
121	}
122
123	return ret;
124}
125
126/*
127 * Packet send completion callback handler.
128 *
129 * It either frees the buffer directly or forwards it to another
130 * completion callback which checks conditions, updates statistics,
131 * wakes up stalled traffic queue if required, and then frees the buffer.
132 */
133int mwifiex_write_data_complete(struct mwifiex_adapter *adapter,
134				struct sk_buff *skb, int status)
135{
136	struct mwifiex_private *priv, *tpriv;
137	struct mwifiex_txinfo *tx_info;
138	int i;
139
140	if (!skb)
141		return 0;
142
143	tx_info = MWIFIEX_SKB_TXCB(skb);
144	priv = mwifiex_get_priv_by_id(adapter, tx_info->bss_num,
145				      tx_info->bss_type);
146	if (!priv)
147		goto done;
148
149	if (adapter->iface_type == MWIFIEX_USB)
150		adapter->data_sent = false;
151
152	mwifiex_set_trans_start(priv->netdev);
153	if (!status) {
154		priv->stats.tx_packets++;
155		priv->stats.tx_bytes += skb->len;
156	} else {
157		priv->stats.tx_errors++;
158	}
159
160	if (atomic_dec_return(&adapter->tx_pending) >= LOW_TX_PENDING)
161		goto done;
162
163	for (i = 0; i < adapter->priv_num; i++) {
164		tpriv = adapter->priv[i];
165
166		if (tpriv->media_connected &&
167		    netif_queue_stopped(tpriv->netdev))
168			mwifiex_wake_up_net_dev_queue(tpriv->netdev, adapter);
169	}
170done:
171	dev_kfree_skb_any(skb);
172
173	return 0;
174}
175EXPORT_SYMBOL_GPL(mwifiex_write_data_complete);
176