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         rx_info->bss_index = priv->bss_index;
  52
  53         return mwifiex_process_sta_rx_packet(adapter, skb);
  54 }
  55 EXPORT_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  */
  66 int 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 = 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, 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                                 if (local_tx_pd)
  91                                         local_tx_pd->flags = 0;
  92                 }
  93                 dev_dbg(adapter->dev, "data: -EBUSY is returned\n");
  94                 break;
  95         case -1:
  96                 adapter->data_sent = false;
  97                 dev_err(adapter->dev, "mwifiex_write_data_async failed: 0x%X\n",
  98                        ret);
  99                 adapter->dbg.num_tx_host_to_card_failure++;
 100                 mwifiex_write_data_complete(adapter, skb, ret);
 101                 break;
 102         case -EINPROGRESS:
 103                 adapter->data_sent = false;
 104                 break;
 105         case 0:
 106                 mwifiex_write_data_complete(adapter, skb, ret);
 107                 break;
 108         default:
 109                 break;
 110         }
 111
 112         return ret;
 113 }
 114
 115 /*
 116  * Packet send completion callback handler.
 117  *
 118  * It either frees the buffer directly or forwards it to another
 119  * completion callback which checks conditions, updates statistics,
 120  * wakes up stalled traffic queue if required, and then frees the buffer.
 121  */
 122 int mwifiex_write_data_complete(struct mwifiex_adapter *adapter,
 123                                 struct sk_buff *skb, int status)
 124 {
 125         struct mwifiex_private *priv, *tpriv;
 126         struct mwifiex_txinfo *tx_info;
 127         int i;
 128
 129         if (!skb)
 130                 return 0;
 131
 132         tx_info = MWIFIEX_SKB_TXCB(skb);
 133         priv = mwifiex_bss_index_to_priv(adapter, tx_info->bss_index);
 134         if (!priv)
 135                 goto done;
 136
 137         priv->netdev->trans_start = jiffies;
 138         if (!status) {
 139                 priv->stats.tx_packets++;
 140                 priv->stats.tx_bytes += skb->len;
 141         } else {
 142                 priv->stats.tx_errors++;
 143         }
 144
 145         if (atomic_dec_return(&adapter->tx_pending) >= LOW_TX_PENDING)
 146                 goto done;
 147
 148         for (i = 0; i < adapter->priv_num; i++) {
 149
 150                 tpriv = adapter->priv[i];
 151
 152                 if ((GET_BSS_ROLE(tpriv) == MWIFIEX_BSS_ROLE_STA)
 153                                 && (tpriv->media_connected)) {
 154                         if (netif_queue_stopped(tpriv->netdev))
 155                                 netif_wake_queue(tpriv->netdev);
 156                 }
 157         }
 158 done:
 159         dev_kfree_skb_any(skb);
 160
 161         return 0;
 162 }
 163