]> Pileus Git - ~andy/linux/blob - drivers/net/wireless/mwifiex/txrx.c
Merge tag 'v3.10-rc1' into patchwork
[~andy/linux] / 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         if (!priv) {
52                 dev_err(adapter->dev, "data: priv not found. Drop RX packet\n");
53                 dev_kfree_skb_any(skb);
54                 return -1;
55         }
56
57         rx_info->bss_num = priv->bss_num;
58         rx_info->bss_type = priv->bss_type;
59
60         if (priv->bss_role == MWIFIEX_BSS_ROLE_UAP)
61                 return mwifiex_process_uap_rx_packet(priv, skb);
62
63         return mwifiex_process_sta_rx_packet(priv, skb);
64 }
65 EXPORT_SYMBOL_GPL(mwifiex_handle_rx_packet);
66
67 /*
68  * This function sends a packet to device.
69  *
70  * It processes the packet to add the TxPD, checks condition and
71  * sends the processed packet to firmware for transmission.
72  *
73  * On successful completion, the function calls the completion callback
74  * and logs the time.
75  */
76 int mwifiex_process_tx(struct mwifiex_private *priv, struct sk_buff *skb,
77                        struct mwifiex_tx_param *tx_param)
78 {
79         int ret = -1;
80         struct mwifiex_adapter *adapter = priv->adapter;
81         u8 *head_ptr;
82         struct txpd *local_tx_pd = NULL;
83
84         if (priv->bss_role == MWIFIEX_BSS_ROLE_UAP)
85                 head_ptr = mwifiex_process_uap_txpd(priv, skb);
86         else
87                 head_ptr = mwifiex_process_sta_txpd(priv, skb);
88
89         if (head_ptr) {
90                 if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA)
91                         local_tx_pd =
92                                 (struct txpd *) (head_ptr + INTF_HEADER_LEN);
93                 if (adapter->iface_type == MWIFIEX_USB) {
94                         adapter->data_sent = true;
95                         skb_pull(skb, INTF_HEADER_LEN);
96                         ret = adapter->if_ops.host_to_card(adapter,
97                                                            MWIFIEX_USB_EP_DATA,
98                                                            skb, NULL);
99                 } else {
100                         ret = adapter->if_ops.host_to_card(adapter,
101                                                            MWIFIEX_TYPE_DATA,
102                                                            skb, tx_param);
103                 }
104         }
105
106         switch (ret) {
107         case -ENOSR:
108                 dev_err(adapter->dev, "data: -ENOSR is returned\n");
109                 break;
110         case -EBUSY:
111                 if ((GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA) &&
112                     (adapter->pps_uapsd_mode) && (adapter->tx_lock_flag)) {
113                                 priv->adapter->tx_lock_flag = false;
114                                 if (local_tx_pd)
115                                         local_tx_pd->flags = 0;
116                 }
117                 dev_dbg(adapter->dev, "data: -EBUSY is returned\n");
118                 break;
119         case -1:
120                 if (adapter->iface_type != MWIFIEX_PCIE)
121                         adapter->data_sent = false;
122                 dev_err(adapter->dev, "mwifiex_write_data_async failed: 0x%X\n",
123                         ret);
124                 adapter->dbg.num_tx_host_to_card_failure++;
125                 mwifiex_write_data_complete(adapter, skb, 0, ret);
126                 break;
127         case -EINPROGRESS:
128                 if (adapter->iface_type != MWIFIEX_PCIE)
129                         adapter->data_sent = false;
130                 break;
131         case 0:
132                 mwifiex_write_data_complete(adapter, skb, 0, ret);
133                 break;
134         default:
135                 break;
136         }
137
138         return ret;
139 }
140
141 /*
142  * Packet send completion callback handler.
143  *
144  * It either frees the buffer directly or forwards it to another
145  * completion callback which checks conditions, updates statistics,
146  * wakes up stalled traffic queue if required, and then frees the buffer.
147  */
148 int mwifiex_write_data_complete(struct mwifiex_adapter *adapter,
149                                 struct sk_buff *skb, int aggr, int status)
150 {
151         struct mwifiex_private *priv;
152         struct mwifiex_txinfo *tx_info;
153         struct netdev_queue *txq;
154         int index;
155
156         if (!skb)
157                 return 0;
158
159         tx_info = MWIFIEX_SKB_TXCB(skb);
160         priv = mwifiex_get_priv_by_id(adapter, tx_info->bss_num,
161                                       tx_info->bss_type);
162         if (!priv)
163                 goto done;
164
165         if (adapter->iface_type == MWIFIEX_USB)
166                 adapter->data_sent = false;
167
168         mwifiex_set_trans_start(priv->netdev);
169         if (!status) {
170                 priv->stats.tx_packets++;
171                 priv->stats.tx_bytes += skb->len;
172                 if (priv->tx_timeout_cnt)
173                         priv->tx_timeout_cnt = 0;
174         } else {
175                 priv->stats.tx_errors++;
176         }
177
178         if (tx_info->flags & MWIFIEX_BUF_FLAG_BRIDGED_PKT)
179                 atomic_dec_return(&adapter->pending_bridged_pkts);
180
181         if (aggr)
182                 /* For skb_aggr, do not wake up tx queue */
183                 goto done;
184
185         atomic_dec(&adapter->tx_pending);
186
187         index = mwifiex_1d_to_wmm_queue[skb->priority];
188         if (atomic_dec_return(&priv->wmm_tx_pending[index]) < LOW_TX_PENDING) {
189                 txq = netdev_get_tx_queue(priv->netdev, index);
190                 if (netif_tx_queue_stopped(txq)) {
191                         netif_tx_wake_queue(txq);
192                         dev_dbg(adapter->dev, "wake queue: %d\n", index);
193                 }
194         }
195 done:
196         dev_kfree_skb_any(skb);
197
198         return 0;
199 }
200 EXPORT_SYMBOL_GPL(mwifiex_write_data_complete);
201