txrx.c revision 9da9a3b29ba6a9a98e437f24576f13cbe259997b
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_num = priv->bss_num; 52 rx_info->bss_type = priv->bss_type; 53 54 return mwifiex_process_sta_rx_packet(adapter, skb); 55} 56EXPORT_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 */ 67int 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) && 89 (adapter->tx_lock_flag)) { 90 priv->adapter->tx_lock_flag = false; 91 if (local_tx_pd) 92 local_tx_pd->flags = 0; 93 } 94 dev_dbg(adapter->dev, "data: -EBUSY is returned\n"); 95 break; 96 case -1: 97 adapter->data_sent = false; 98 dev_err(adapter->dev, "mwifiex_write_data_async failed: 0x%X\n", 99 ret); 100 adapter->dbg.num_tx_host_to_card_failure++; 101 mwifiex_write_data_complete(adapter, skb, ret); 102 break; 103 case -EINPROGRESS: 104 adapter->data_sent = false; 105 break; 106 case 0: 107 mwifiex_write_data_complete(adapter, skb, ret); 108 break; 109 default: 110 break; 111 } 112 113 return ret; 114} 115 116/* 117 * Packet send completion callback handler. 118 * 119 * It either frees the buffer directly or forwards it to another 120 * completion callback which checks conditions, updates statistics, 121 * wakes up stalled traffic queue if required, and then frees the buffer. 122 */ 123int mwifiex_write_data_complete(struct mwifiex_adapter *adapter, 124 struct sk_buff *skb, int status) 125{ 126 struct mwifiex_private *priv, *tpriv; 127 struct mwifiex_txinfo *tx_info; 128 int i; 129 130 if (!skb) 131 return 0; 132 133 tx_info = MWIFIEX_SKB_TXCB(skb); 134 priv = mwifiex_get_priv_by_id(adapter, tx_info->bss_num, 135 tx_info->bss_type); 136 if (!priv) 137 goto done; 138 139 mwifiex_set_trans_start(priv->netdev); 140 if (!status) { 141 priv->stats.tx_packets++; 142 priv->stats.tx_bytes += skb->len; 143 } else { 144 priv->stats.tx_errors++; 145 } 146 147 if (atomic_dec_return(&adapter->tx_pending) >= LOW_TX_PENDING) 148 goto done; 149 150 for (i = 0; i < adapter->priv_num; i++) { 151 152 tpriv = adapter->priv[i]; 153 154 if ((GET_BSS_ROLE(tpriv) == MWIFIEX_BSS_ROLE_STA) 155 && (tpriv->media_connected)) { 156 if (netif_queue_stopped(tpriv->netdev)) 157 mwifiex_wake_up_net_dev_queue(tpriv->netdev, 158 adapter); 159 } 160 } 161done: 162 dev_kfree_skb_any(skb); 163 164 return 0; 165} 166 167