txrx.c revision a1ed484960066c413712cd9c4d50a350cf67eba3
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 int ret; 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 if (!priv) { 53 dev_err(adapter->dev, "data: priv not found. Drop RX packet\n"); 54 dev_kfree_skb_any(skb); 55 return -1; 56 } 57 58 rx_info->bss_num = priv->bss_num; 59 rx_info->bss_type = priv->bss_type; 60 61 if (priv->bss_role == MWIFIEX_BSS_ROLE_UAP) 62 ret = mwifiex_process_uap_rx_packet(priv, skb); 63 else 64 ret = mwifiex_process_sta_rx_packet(priv, skb); 65 66 /* Decrement RX pending counter for each packet */ 67 if (adapter->if_ops.data_complete) 68 adapter->if_ops.data_complete(adapter); 69 70 return ret; 71} 72EXPORT_SYMBOL_GPL(mwifiex_handle_rx_packet); 73 74/* 75 * This function sends a packet to device. 76 * 77 * It processes the packet to add the TxPD, checks condition and 78 * sends the processed packet to firmware for transmission. 79 * 80 * On successful completion, the function calls the completion callback 81 * and logs the time. 82 */ 83int mwifiex_process_tx(struct mwifiex_private *priv, struct sk_buff *skb, 84 struct mwifiex_tx_param *tx_param) 85{ 86 int ret = -1; 87 struct mwifiex_adapter *adapter = priv->adapter; 88 u8 *head_ptr; 89 struct txpd *local_tx_pd = NULL; 90 91 if (priv->bss_role == MWIFIEX_BSS_ROLE_UAP) 92 head_ptr = mwifiex_process_uap_txpd(priv, skb); 93 else 94 head_ptr = mwifiex_process_sta_txpd(priv, skb); 95 96 if (head_ptr) { 97 if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA) 98 local_tx_pd = 99 (struct txpd *) (head_ptr + INTF_HEADER_LEN); 100 if (adapter->iface_type == MWIFIEX_USB) { 101 adapter->data_sent = true; 102 skb_pull(skb, INTF_HEADER_LEN); 103 ret = adapter->if_ops.host_to_card(adapter, 104 MWIFIEX_USB_EP_DATA, 105 skb, NULL); 106 } else { 107 ret = adapter->if_ops.host_to_card(adapter, 108 MWIFIEX_TYPE_DATA, 109 skb, tx_param); 110 } 111 } 112 113 switch (ret) { 114 case -ENOSR: 115 dev_err(adapter->dev, "data: -ENOSR is returned\n"); 116 break; 117 case -EBUSY: 118 if ((GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA) && 119 (adapter->pps_uapsd_mode) && (adapter->tx_lock_flag)) { 120 priv->adapter->tx_lock_flag = false; 121 if (local_tx_pd) 122 local_tx_pd->flags = 0; 123 } 124 dev_dbg(adapter->dev, "data: -EBUSY is returned\n"); 125 break; 126 case -1: 127 if (adapter->iface_type != MWIFIEX_PCIE) 128 adapter->data_sent = false; 129 dev_err(adapter->dev, "mwifiex_write_data_async failed: 0x%X\n", 130 ret); 131 adapter->dbg.num_tx_host_to_card_failure++; 132 mwifiex_write_data_complete(adapter, skb, 0, ret); 133 break; 134 case -EINPROGRESS: 135 if (adapter->iface_type != MWIFIEX_PCIE) 136 adapter->data_sent = false; 137 break; 138 case 0: 139 mwifiex_write_data_complete(adapter, skb, 0, ret); 140 break; 141 default: 142 break; 143 } 144 145 return ret; 146} 147 148/* 149 * Packet send completion callback handler. 150 * 151 * It either frees the buffer directly or forwards it to another 152 * completion callback which checks conditions, updates statistics, 153 * wakes up stalled traffic queue if required, and then frees the buffer. 154 */ 155int mwifiex_write_data_complete(struct mwifiex_adapter *adapter, 156 struct sk_buff *skb, int aggr, int status) 157{ 158 struct mwifiex_private *priv; 159 struct mwifiex_txinfo *tx_info; 160 struct netdev_queue *txq; 161 int index; 162 163 if (!skb) 164 return 0; 165 166 tx_info = MWIFIEX_SKB_TXCB(skb); 167 priv = mwifiex_get_priv_by_id(adapter, tx_info->bss_num, 168 tx_info->bss_type); 169 if (!priv) 170 goto done; 171 172 if (adapter->iface_type == MWIFIEX_USB) 173 adapter->data_sent = false; 174 175 mwifiex_set_trans_start(priv->netdev); 176 if (!status) { 177 priv->stats.tx_packets++; 178 priv->stats.tx_bytes += tx_info->pkt_len; 179 if (priv->tx_timeout_cnt) 180 priv->tx_timeout_cnt = 0; 181 } else { 182 priv->stats.tx_errors++; 183 } 184 185 if (tx_info->flags & MWIFIEX_BUF_FLAG_BRIDGED_PKT) 186 atomic_dec_return(&adapter->pending_bridged_pkts); 187 188 if (aggr) 189 /* For skb_aggr, do not wake up tx queue */ 190 goto done; 191 192 atomic_dec(&adapter->tx_pending); 193 194 index = mwifiex_1d_to_wmm_queue[skb->priority]; 195 if (atomic_dec_return(&priv->wmm_tx_pending[index]) < LOW_TX_PENDING) { 196 txq = netdev_get_tx_queue(priv->netdev, index); 197 if (netif_tx_queue_stopped(txq)) { 198 netif_tx_wake_queue(txq); 199 dev_dbg(adapter->dev, "wake queue: %d\n", index); 200 } 201 } 202done: 203 dev_kfree_skb_any(skb); 204 205 return 0; 206} 207EXPORT_SYMBOL_GPL(mwifiex_write_data_complete); 208 209