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 */
mwifiex_handle_rx_packet(struct mwifiex_adapter * adapter,struct sk_buff * skb)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 */
mwifiex_process_tx(struct mwifiex_private * priv,struct sk_buff * skb,struct mwifiex_tx_param * tx_param)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
81 ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_TYPE_DATA,
82 skb, tx_param);
83 }
84
85 switch (ret) {
86 case -EBUSY:
87 if ((GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA) &&
88 (adapter->pps_uapsd_mode) && (adapter->tx_lock_flag)) {
89 priv->adapter->tx_lock_flag = false;
90 if (local_tx_pd)
91 local_tx_pd->flags = 0;
92 }
93 dev_dbg(adapter->dev, "data: -EBUSY is returned\n");
94 break;
95 case -1:
96 adapter->data_sent = false;
97 dev_err(adapter->dev, "mwifiex_write_data_async failed: 0x%X\n",
98 ret);
99 adapter->dbg.num_tx_host_to_card_failure++;
100 mwifiex_write_data_complete(adapter, skb, ret);
101 break;
102 case -EINPROGRESS:
103 adapter->data_sent = false;
104 break;
105 case 0:
106 mwifiex_write_data_complete(adapter, skb, ret);
107 break;
108 default:
109 break;
110 }
111
112 return ret;
113 }
114
115 /*
116 * Packet send completion callback handler.
117 *
118 * It either frees the buffer directly or forwards it to another
119 * completion callback which checks conditions, updates statistics,
120 * wakes up stalled traffic queue if required, and then frees the buffer.
121 */
mwifiex_write_data_complete(struct mwifiex_adapter * adapter,struct sk_buff * skb,int status)122 int mwifiex_write_data_complete(struct mwifiex_adapter *adapter,
123 struct sk_buff *skb, int status)
124 {
125 struct mwifiex_private *priv, *tpriv;
126 struct mwifiex_txinfo *tx_info;
127 int i;
128
129 if (!skb)
130 return 0;
131
132 tx_info = MWIFIEX_SKB_TXCB(skb);
133 priv = mwifiex_get_priv_by_id(adapter, tx_info->bss_num,
134 tx_info->bss_type);
135 if (!priv)
136 goto done;
137
138 mwifiex_set_trans_start(priv->netdev);
139 if (!status) {
140 priv->stats.tx_packets++;
141 priv->stats.tx_bytes += skb->len;
142 } else {
143 priv->stats.tx_errors++;
144 }
145
146 if (atomic_dec_return(&adapter->tx_pending) >= LOW_TX_PENDING)
147 goto done;
148
149 for (i = 0; i < adapter->priv_num; i++) {
150
151 tpriv = adapter->priv[i];
152
153 if ((GET_BSS_ROLE(tpriv) == MWIFIEX_BSS_ROLE_STA) &&
154 (tpriv->media_connected)) {
155 if (netif_queue_stopped(tpriv->netdev))
156 mwifiex_wake_up_net_dev_queue(tpriv->netdev,
157 adapter);
158 }
159 }
160 done:
161 dev_kfree_skb_any(skb);
162
163 return 0;
164 }
165
166