txrx.c revision 711825a06bb288e04f8236d77c4e12eba9a1c478 
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, 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 */
122int 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	priv->netdev->trans_start = jiffies;
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				netif_wake_queue(tpriv->netdev);
156		}
157	}
158done:
159	dev_kfree_skb_any(skb);
160
161	return 0;
162}
163
164