txrx.c revision f3b369e40a0fbf975ab0e39c2104f184e188afc3
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 if (!priv) { 52 dev_err(adapter->dev, "data: priv not found. Drop RX packet\n"); 53 dev_kfree_skb_any(skb); 54 return -1; 55 } 56 57 rx_info->bss_num = priv->bss_num; 58 rx_info->bss_type = priv->bss_type; 59 60 if (priv->bss_role == MWIFIEX_BSS_ROLE_UAP) 61 return mwifiex_process_uap_rx_packet(priv, skb); 62 63 return mwifiex_process_sta_rx_packet(priv, skb); 64} 65EXPORT_SYMBOL_GPL(mwifiex_handle_rx_packet); 66 67/* 68 * This function sends a packet to device. 69 * 70 * It processes the packet to add the TxPD, checks condition and 71 * sends the processed packet to firmware for transmission. 72 * 73 * On successful completion, the function calls the completion callback 74 * and logs the time. 75 */ 76int mwifiex_process_tx(struct mwifiex_private *priv, struct sk_buff *skb, 77 struct mwifiex_tx_param *tx_param) 78{ 79 int ret = -1; 80 struct mwifiex_adapter *adapter = priv->adapter; 81 u8 *head_ptr; 82 struct txpd *local_tx_pd = NULL; 83 84 if (priv->bss_role == MWIFIEX_BSS_ROLE_UAP) 85 head_ptr = mwifiex_process_uap_txpd(priv, skb); 86 else 87 head_ptr = mwifiex_process_sta_txpd(priv, skb); 88 89 if (head_ptr) { 90 if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA) 91 local_tx_pd = 92 (struct txpd *) (head_ptr + INTF_HEADER_LEN); 93 if (adapter->iface_type == MWIFIEX_USB) { 94 adapter->data_sent = true; 95 skb_pull(skb, INTF_HEADER_LEN); 96 ret = adapter->if_ops.host_to_card(adapter, 97 MWIFIEX_USB_EP_DATA, 98 skb, NULL); 99 } else { 100 ret = adapter->if_ops.host_to_card(adapter, 101 MWIFIEX_TYPE_DATA, 102 skb, tx_param); 103 } 104 } 105 106 switch (ret) { 107 case -ENOSR: 108 dev_err(adapter->dev, "data: -ENOSR is returned\n"); 109 break; 110 case -EBUSY: 111 if ((GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA) && 112 (adapter->pps_uapsd_mode) && (adapter->tx_lock_flag)) { 113 priv->adapter->tx_lock_flag = false; 114 if (local_tx_pd) 115 local_tx_pd->flags = 0; 116 } 117 dev_dbg(adapter->dev, "data: -EBUSY is returned\n"); 118 break; 119 case -1: 120 adapter->data_sent = false; 121 dev_err(adapter->dev, "mwifiex_write_data_async failed: 0x%X\n", 122 ret); 123 adapter->dbg.num_tx_host_to_card_failure++; 124 mwifiex_write_data_complete(adapter, skb, ret); 125 break; 126 case -EINPROGRESS: 127 adapter->data_sent = false; 128 break; 129 case 0: 130 mwifiex_write_data_complete(adapter, skb, ret); 131 break; 132 default: 133 break; 134 } 135 136 return ret; 137} 138 139/* 140 * Packet send completion callback handler. 141 * 142 * It either frees the buffer directly or forwards it to another 143 * completion callback which checks conditions, updates statistics, 144 * wakes up stalled traffic queue if required, and then frees the buffer. 145 */ 146int mwifiex_write_data_complete(struct mwifiex_adapter *adapter, 147 struct sk_buff *skb, int status) 148{ 149 struct mwifiex_private *priv, *tpriv; 150 struct mwifiex_txinfo *tx_info; 151 int i; 152 153 if (!skb) 154 return 0; 155 156 tx_info = MWIFIEX_SKB_TXCB(skb); 157 priv = mwifiex_get_priv_by_id(adapter, tx_info->bss_num, 158 tx_info->bss_type); 159 if (!priv) 160 goto done; 161 162 if (adapter->iface_type == MWIFIEX_USB) 163 adapter->data_sent = false; 164 165 mwifiex_set_trans_start(priv->netdev); 166 if (!status) { 167 priv->stats.tx_packets++; 168 priv->stats.tx_bytes += skb->len; 169 } else { 170 priv->stats.tx_errors++; 171 } 172 173 if (tx_info->flags & MWIFIEX_BUF_FLAG_BRIDGED_PKT) 174 atomic_dec_return(&adapter->pending_bridged_pkts); 175 if (atomic_dec_return(&adapter->tx_pending) >= LOW_TX_PENDING) 176 goto done; 177 178 for (i = 0; i < adapter->priv_num; i++) { 179 tpriv = adapter->priv[i]; 180 181 if (tpriv->media_connected && 182 netif_queue_stopped(tpriv->netdev)) 183 mwifiex_wake_up_net_dev_queue(tpriv->netdev, adapter); 184 } 185done: 186 dev_kfree_skb_any(skb); 187 188 return 0; 189} 190EXPORT_SYMBOL_GPL(mwifiex_write_data_complete); 191 192