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_index = priv->bss_index;
52
53 return mwifiex_process_sta_rx_packet(adapter, skb);
54 }
55 EXPORT_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 */
mwifiex_process_tx(struct mwifiex_private * priv,struct sk_buff * skb,struct mwifiex_tx_param * tx_param)66 int 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, 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 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_bss_index_to_priv(adapter, tx_info->bss_index);
134 if (!priv)
135 goto done;
136
137 mwifiex_set_trans_start(priv->netdev);
138 if (!status) {
139 priv->stats.tx_packets++;
140 priv->stats.tx_bytes += skb->len;
141 } else {
142 priv->stats.tx_errors++;
143 }
144
145 if (atomic_dec_return(&adapter->tx_pending) >= LOW_TX_PENDING)
146 goto done;
147
148 for (i = 0; i < adapter->priv_num; i++) {
149
150 tpriv = adapter->priv[i];
151
152 if ((GET_BSS_ROLE(tpriv) == MWIFIEX_BSS_ROLE_STA)
153 && (tpriv->media_connected)) {
154 if (netif_queue_stopped(tpriv->netdev))
155 mwifiex_wake_up_net_dev_queue(tpriv->netdev,
156 adapter);
157 }
158 }
159 done:
160 dev_kfree_skb_any(skb);
161
162 return 0;
163 }
164
165