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/drivers/net/wireless/mwifiex/txrx.c

https://bitbucket.org/cyanogenmod/android_kernel_asus_tf300t
C | 202 lines | 125 code | 26 blank | 51 comment | 24 complexity | ada39ac8702c405fb355e553f60f9c7f MD5 | raw file
Possible License(s): LGPL-2.0, AGPL-1.0, GPL-2.0
  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_index = priv->bss_index;
 52
 53	return mwifiex_process_sta_rx_packet(adapter, skb);
 54}
 55EXPORT_SYMBOL_GPL(mwifiex_handle_rx_packet);
 56
 57/*
 58 * This function sends a packet to device.
 59 *
 60 * It processes the packet to add the TxPD, checks condition and
 61 * sends the processed packet to firmware for transmission.
 62 *
 63 * On successful completion, the function calls the completion callback
 64 * and logs the time.
 65 */
 66int mwifiex_process_tx(struct mwifiex_private *priv, struct sk_buff *skb,
 67		       struct mwifiex_tx_param *tx_param)
 68{
 69	int ret = -1;
 70	struct mwifiex_adapter *adapter = priv->adapter;
 71	u8 *head_ptr;
 72	struct txpd *local_tx_pd = NULL;
 73
 74	head_ptr = mwifiex_process_sta_txpd(priv, skb);
 75	if (head_ptr) {
 76		if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA)
 77			local_tx_pd =
 78				(struct txpd *) (head_ptr + INTF_HEADER_LEN);
 79
 80		ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_TYPE_DATA,
 81					     skb->data, skb->len, tx_param);
 82	}
 83
 84	switch (ret) {
 85	case -EBUSY:
 86		if ((GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA) &&
 87			(adapter->pps_uapsd_mode) &&
 88			(adapter->tx_lock_flag)) {
 89				priv->adapter->tx_lock_flag = false;
 90				local_tx_pd->flags = 0;
 91		}
 92		dev_dbg(adapter->dev, "data: -EBUSY is returned\n");
 93		break;
 94	case -1:
 95		adapter->data_sent = false;
 96		dev_err(adapter->dev, "mwifiex_write_data_async failed: 0x%X\n",
 97		       ret);
 98		adapter->dbg.num_tx_host_to_card_failure++;
 99		mwifiex_write_data_complete(adapter, skb, ret);
100		break;
101	case -EINPROGRESS:
102		adapter->data_sent = false;
103		break;
104	case 0:
105		mwifiex_write_data_complete(adapter, skb, ret);
106		break;
107	default:
108		break;
109	}
110
111	return ret;
112}
113
114/*
115 * Packet send completion callback handler.
116 *
117 * It either frees the buffer directly or forwards it to another
118 * completion callback which checks conditions, updates statistics,
119 * wakes up stalled traffic queue if required, and then frees the buffer.
120 */
121int mwifiex_write_data_complete(struct mwifiex_adapter *adapter,
122				struct sk_buff *skb, int status)
123{
124	struct mwifiex_private *priv, *tpriv;
125	struct mwifiex_txinfo *tx_info;
126	int i;
127
128	if (!skb)
129		return 0;
130
131	tx_info = MWIFIEX_SKB_TXCB(skb);
132	priv = mwifiex_bss_index_to_priv(adapter, tx_info->bss_index);
133	if (!priv)
134		goto done;
135
136	priv->netdev->trans_start = jiffies;
137	if (!status) {
138		priv->stats.tx_packets++;
139		priv->stats.tx_bytes += skb->len;
140	} else {
141		priv->stats.tx_errors++;
142	}
143
144	if (atomic_dec_return(&adapter->tx_pending) >= LOW_TX_PENDING)
145		goto done;
146
147	for (i = 0; i < adapter->priv_num; i++) {
148
149		tpriv = adapter->priv[i];
150
151		if ((GET_BSS_ROLE(tpriv) == MWIFIEX_BSS_ROLE_STA)
152				&& (tpriv->media_connected)) {
153			if (netif_queue_stopped(tpriv->netdev))
154				netif_wake_queue(tpriv->netdev);
155		}
156	}
157done:
158	dev_kfree_skb_any(skb);
159
160	return 0;
161}
162
163/*
164 * Packet receive completion callback handler.
165 *
166 * This function calls another completion callback handler which
167 * updates the statistics, and optionally updates the parent buffer
168 * use count before freeing the received packet.
169 */
170int mwifiex_recv_packet_complete(struct mwifiex_adapter *adapter,
171				 struct sk_buff *skb, int status)
172{
173	struct mwifiex_rxinfo *rx_info = MWIFIEX_SKB_RXCB(skb);
174	struct mwifiex_rxinfo *rx_info_parent;
175	struct mwifiex_private *priv;
176	struct sk_buff *skb_parent;
177	unsigned long flags;
178
179	priv = adapter->priv[rx_info->bss_index];
180
181	if (priv && (status == -1))
182		priv->stats.rx_dropped++;
183
184	if (rx_info->parent) {
185		skb_parent = rx_info->parent;
186		rx_info_parent = MWIFIEX_SKB_RXCB(skb_parent);
187
188		spin_lock_irqsave(&priv->rx_pkt_lock, flags);
189		--rx_info_parent->use_count;
190
191		if (!rx_info_parent->use_count) {
192			spin_unlock_irqrestore(&priv->rx_pkt_lock, flags);
193			dev_kfree_skb_any(skb_parent);
194		} else {
195			spin_unlock_irqrestore(&priv->rx_pkt_lock, flags);
196		}
197	} else {
198		dev_kfree_skb_any(skb);
199	}
200
201	return 0;
202}