txrx.c revision 5e6e3a92b9a4c9416b17f468fa5c7fa2233b8b4e
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 int ret = 0; 40 struct mwifiex_private *priv = 41 mwifiex_get_priv(adapter, MWIFIEX_BSS_ROLE_ANY); 42 struct rxpd *local_rx_pd; 43 struct mwifiex_rxinfo *rx_info = MWIFIEX_SKB_RXCB(skb); 44 45 local_rx_pd = (struct rxpd *) (skb->data); 46 /* Get the BSS number from rxpd, get corresponding priv */ 47 priv = mwifiex_get_priv_by_id(adapter, local_rx_pd->bss_num & 48 BSS_NUM_MASK, local_rx_pd->bss_type); 49 if (!priv) 50 priv = mwifiex_get_priv(adapter, MWIFIEX_BSS_ROLE_ANY); 51 52 rx_info->bss_index = priv->bss_index; 53 ret = mwifiex_process_sta_rx_packet(adapter, skb); 54 55 return ret; 56} 57EXPORT_SYMBOL_GPL(mwifiex_handle_rx_packet); 58 59/* 60 * This function sends a packet to device. 61 * 62 * It processes the packet to add the TxPD, checks condition and 63 * sends the processed packet to firmware for transmission. 64 * 65 * On successful completion, the function calls the completion callback 66 * and logs the time. 67 */ 68int mwifiex_process_tx(struct mwifiex_private *priv, struct sk_buff *skb, 69 struct mwifiex_tx_param *tx_param) 70{ 71 int ret = -1; 72 struct mwifiex_adapter *adapter = priv->adapter; 73 u8 *head_ptr = NULL; 74 struct txpd *local_tx_pd = NULL; 75 76 head_ptr = (u8 *) mwifiex_process_sta_txpd(priv, skb); 77 if (head_ptr) { 78 if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA) 79 local_tx_pd = 80 (struct txpd *) (head_ptr + INTF_HEADER_LEN); 81 82 ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_TYPE_DATA, 83 skb->data, skb->len, tx_param); 84 } 85 86 switch (ret) { 87 case -EBUSY: 88 if ((GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA) && 89 (adapter->pps_uapsd_mode) && 90 (adapter->tx_lock_flag)) { 91 priv->adapter->tx_lock_flag = false; 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 = NULL, *tpriv = NULL; 127 struct mwifiex_txinfo *tx_info = NULL; 128 int i; 129 130 if (!skb) 131 return 0; 132 133 tx_info = MWIFIEX_SKB_TXCB(skb); 134 priv = mwifiex_bss_index_to_priv(adapter, tx_info->bss_index); 135 if (!priv) 136 goto done; 137 138 priv->netdev->trans_start = jiffies; 139 if (!status) { 140 priv->stats.tx_packets++; 141 priv->stats.tx_bytes += skb->len; 142 } else { 143 priv->stats.tx_errors++; 144 } 145 atomic_dec(&adapter->tx_pending); 146 147 for (i = 0; i < adapter->priv_num; i++) { 148 149 tpriv = adapter->priv[i]; 150 151 if ((GET_BSS_ROLE(tpriv) == MWIFIEX_BSS_ROLE_STA) 152 && (tpriv->media_connected)) { 153 if (netif_queue_stopped(tpriv->netdev)) 154 netif_wake_queue(tpriv->netdev); 155 } 156 } 157done: 158 dev_kfree_skb_any(skb); 159 160 return 0; 161} 162 163/* 164 * Packet receive completion callback handler. 165 * 166 * This function calls another completion callback handler which 167 * updates the statistics, and optionally updates the parent buffer 168 * use count before freeing the received packet. 169 */ 170int mwifiex_recv_packet_complete(struct mwifiex_adapter *adapter, 171 struct sk_buff *skb, int status) 172{ 173 struct mwifiex_rxinfo *rx_info = MWIFIEX_SKB_RXCB(skb); 174 struct mwifiex_rxinfo *rx_info_parent = NULL; 175 struct mwifiex_private *priv; 176 struct sk_buff *skb_parent = NULL; 177 unsigned long flags; 178 179 priv = adapter->priv[rx_info->bss_index]; 180 181 if (priv && (status == -1)) 182 priv->stats.rx_dropped++; 183 184 if (rx_info->parent) { 185 skb_parent = rx_info->parent; 186 rx_info_parent = MWIFIEX_SKB_RXCB(skb_parent); 187 188 spin_lock_irqsave(&priv->rx_pkt_lock, flags); 189 --rx_info_parent->use_count; 190 191 if (!rx_info_parent->use_count) { 192 spin_unlock_irqrestore(&priv->rx_pkt_lock, flags); 193 dev_kfree_skb_any(skb_parent); 194 } else { 195 spin_unlock_irqrestore(&priv->rx_pkt_lock, flags); 196 } 197 } else { 198 dev_kfree_skb_any(skb); 199 } 200 201 return 0; 202} 203