txrx.c revision 62a5b7dcee00c8e64e61ed98541c95fd38583116
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 = (u8 *) 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->data, skb->len, 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 local_tx_pd->flags = 0; 91 } 92 dev_dbg(adapter->dev, "data: -EBUSY is returned\n"); 93 break; 94 case -1: 95 adapter->data_sent = false; 96 dev_err(adapter->dev, "mwifiex_write_data_async failed: 0x%X\n", 97 ret); 98 adapter->dbg.num_tx_host_to_card_failure++; 99 mwifiex_write_data_complete(adapter, skb, ret); 100 break; 101 case -EINPROGRESS: 102 adapter->data_sent = false; 103 break; 104 case 0: 105 mwifiex_write_data_complete(adapter, skb, ret); 106 break; 107 default: 108 break; 109 } 110 111 return ret; 112} 113 114/* 115 * Packet send completion callback handler. 116 * 117 * It either frees the buffer directly or forwards it to another 118 * completion callback which checks conditions, updates statistics, 119 * wakes up stalled traffic queue if required, and then frees the buffer. 120 */ 121int mwifiex_write_data_complete(struct mwifiex_adapter *adapter, 122 struct sk_buff *skb, int status) 123{ 124 struct mwifiex_private *priv, *tpriv; 125 struct mwifiex_txinfo *tx_info; 126 int i; 127 128 if (!skb) 129 return 0; 130 131 tx_info = MWIFIEX_SKB_TXCB(skb); 132 priv = mwifiex_bss_index_to_priv(adapter, tx_info->bss_index); 133 if (!priv) 134 goto done; 135 136 priv->netdev->trans_start = jiffies; 137 if (!status) { 138 priv->stats.tx_packets++; 139 priv->stats.tx_bytes += skb->len; 140 } else { 141 priv->stats.tx_errors++; 142 } 143 144 if (atomic_dec_return(&adapter->tx_pending) >= LOW_TX_PENDING) 145 goto done; 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; 175 struct mwifiex_private *priv; 176 struct sk_buff *skb_parent; 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