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->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  */
 121 int 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         }
 157 done:
 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  */
 170 int 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 }