Merge branch 'lpc32xx/core2' of git://git.antcom.de/linux-2.6 into next/soc
[cascardo/linux.git] / drivers / net / wireless / mwifiex / txrx.c
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  */
36 int 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 }
56 EXPORT_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  */
67 int 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  */
133 int 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         }
170 done:
171         dev_kfree_skb_any(skb);
172
173         return 0;
174 }
175 EXPORT_SYMBOL_GPL(mwifiex_write_data_complete);
176