drivers/net/wireless/mwifiex/txrx.c

   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  */
  36 int 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 }
  65 EXPORT_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  */
  76 int 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, 0, ret);
 125                 break;
 126         case -EINPROGRESS:
 127                 adapter->data_sent = false;
 128                 break;
 129         case 0:
 130                 mwifiex_write_data_complete(adapter, skb, 0, 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  */
 146 int mwifiex_write_data_complete(struct mwifiex_adapter *adapter,
 147                                 struct sk_buff *skb, int aggr, int status)
 148 {
 149         struct mwifiex_private *priv;
 150         struct mwifiex_txinfo *tx_info;
 151         struct netdev_queue *txq;
 152         int index;
 153
 154         if (!skb)
 155                 return 0;
 156
 157         tx_info = MWIFIEX_SKB_TXCB(skb);
 158         priv = mwifiex_get_priv_by_id(adapter, tx_info->bss_num,
 159                                       tx_info->bss_type);
 160         if (!priv)
 161                 goto done;
 162
 163         if (adapter->iface_type == MWIFIEX_USB)
 164                 adapter->data_sent = false;
 165
 166         mwifiex_set_trans_start(priv->netdev);
 167         if (!status) {
 168                 priv->stats.tx_packets++;
 169                 priv->stats.tx_bytes += skb->len;
 170         } else {
 171                 priv->stats.tx_errors++;
 172         }
 173
 174         if (tx_info->flags & MWIFIEX_BUF_FLAG_BRIDGED_PKT)
 175                 atomic_dec_return(&adapter->pending_bridged_pkts);
 176
 177         if (aggr)
 178                 /* For skb_aggr, do not wake up tx queue */
 179                 goto done;
 180
 181         atomic_dec(&adapter->tx_pending);
 182
 183         index = mwifiex_1d_to_wmm_queue[skb->priority];
 184         if (atomic_dec_return(&priv->wmm_tx_pending[index]) < LOW_TX_PENDING) {
 185                 txq = netdev_get_tx_queue(priv->netdev, index);
 186                 if (netif_tx_queue_stopped(txq)) {
 187                         netif_tx_wake_queue(txq);
 188                         dev_dbg(adapter->dev, "wake queue: %d\n", index);
 189                 }
 190         }
 191 done:
 192         dev_kfree_skb_any(skb);
 193
 194         return 0;
 195 }
 196 EXPORT_SYMBOL_GPL(mwifiex_write_data_complete);
 197