2 * Marvell Wireless LAN device driver: generic TX/RX data handling
4 * Copyright (C) 2011, Marvell International Ltd.
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.
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.
28 * This function processes the received buffer.
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
36 int mwifiex_handle_rx_packet(struct mwifiex_adapter *adapter,
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);
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);
49 priv = mwifiex_get_priv(adapter, MWIFIEX_BSS_ROLE_ANY);
51 rx_info->bss_index = priv->bss_index;
53 return mwifiex_process_sta_rx_packet(adapter, skb);
55 EXPORT_SYMBOL_GPL(mwifiex_handle_rx_packet);
58 * This function sends a packet to device.
60 * It processes the packet to add the TxPD, checks condition and
61 * sends the processed packet to firmware for transmission.
63 * On successful completion, the function calls the completion callback
66 int mwifiex_process_tx(struct mwifiex_private *priv, struct sk_buff *skb,
67 struct mwifiex_tx_param *tx_param)
70 struct mwifiex_adapter *adapter = priv->adapter;
72 struct txpd *local_tx_pd = NULL;
74 head_ptr = mwifiex_process_sta_txpd(priv, skb);
76 if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA)
78 (struct txpd *) (head_ptr + INTF_HEADER_LEN);
80 ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_TYPE_DATA,
81 skb->data, skb->len, tx_param);
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;
91 local_tx_pd->flags = 0;
93 dev_dbg(adapter->dev, "data: -EBUSY is returned\n");
96 adapter->data_sent = false;
97 dev_err(adapter->dev, "mwifiex_write_data_async failed: 0x%X\n",
99 adapter->dbg.num_tx_host_to_card_failure++;
100 mwifiex_write_data_complete(adapter, skb, ret);
103 adapter->data_sent = false;
106 mwifiex_write_data_complete(adapter, skb, ret);
116 * Packet send completion callback handler.
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.
122 int mwifiex_write_data_complete(struct mwifiex_adapter *adapter,
123 struct sk_buff *skb, int status)
125 struct mwifiex_private *priv, *tpriv;
126 struct mwifiex_txinfo *tx_info;
132 tx_info = MWIFIEX_SKB_TXCB(skb);
133 priv = mwifiex_bss_index_to_priv(adapter, tx_info->bss_index);
137 priv->netdev->trans_start = jiffies;
139 priv->stats.tx_packets++;
140 priv->stats.tx_bytes += skb->len;
142 priv->stats.tx_errors++;
145 if (atomic_dec_return(&adapter->tx_pending) >= LOW_TX_PENDING)
148 for (i = 0; i < adapter->priv_num; i++) {
150 tpriv = adapter->priv[i];
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);
159 dev_kfree_skb_any(skb);
165 * Packet receive completion callback handler.
167 * This function calls another completion callback handler which
168 * updates the statistics, and optionally updates the parent buffer
169 * use count before freeing the received packet.
171 int mwifiex_recv_packet_complete(struct mwifiex_adapter *adapter,
172 struct sk_buff *skb, int status)
174 struct mwifiex_rxinfo *rx_info = MWIFIEX_SKB_RXCB(skb);
175 struct mwifiex_rxinfo *rx_info_parent;
176 struct mwifiex_private *priv;
177 struct sk_buff *skb_parent;
180 priv = adapter->priv[rx_info->bss_index];
182 if (priv && (status == -1))
183 priv->stats.rx_dropped++;
185 if (rx_info->parent) {
186 skb_parent = rx_info->parent;
187 rx_info_parent = MWIFIEX_SKB_RXCB(skb_parent);
189 spin_lock_irqsave(&priv->rx_pkt_lock, flags);
190 --rx_info_parent->use_count;
192 if (!rx_info_parent->use_count) {
193 spin_unlock_irqrestore(&priv->rx_pkt_lock, flags);
194 dev_kfree_skb_any(skb_parent);
196 spin_unlock_irqrestore(&priv->rx_pkt_lock, flags);
199 dev_kfree_skb_any(skb);