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_num = priv->bss_num;
  52         rx_info->bss_type = priv->bss_type;
  53
  54         if (priv->bss_role == MWIFIEX_BSS_ROLE_UAP)
  55                 return mwifiex_process_uap_rx_packet(adapter, skb);
  56
  57         return mwifiex_process_sta_rx_packet(adapter, skb);
  58 }
  59 EXPORT_SYMBOL_GPL(mwifiex_handle_rx_packet);
  60
  61 /*
  62  * This function sends a packet to device.
  63  *
  64  * It processes the packet to add the TxPD, checks condition and
  65  * sends the processed packet to firmware for transmission.
  66  *
  67  * On successful completion, the function calls the completion callback
  68  * and logs the time.
  69  */
  70 int mwifiex_process_tx(struct mwifiex_private *priv, struct sk_buff *skb,
  71                        struct mwifiex_tx_param *tx_param)
  72 {
  73         int ret = -1;
  74         struct mwifiex_adapter *adapter = priv->adapter;
  75         u8 *head_ptr;
  76         struct txpd *local_tx_pd = NULL;
  77
  78         if (priv->bss_role == MWIFIEX_BSS_ROLE_UAP)
  79                 head_ptr = mwifiex_process_uap_txpd(priv, skb);
  80         else
  81                 head_ptr = mwifiex_process_sta_txpd(priv, skb);
  82
  83         if (head_ptr) {
  84                 if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA)
  85                         local_tx_pd =
  86                                 (struct txpd *) (head_ptr + INTF_HEADER_LEN);
  87                 if (adapter->iface_type == MWIFIEX_USB) {
  88                         adapter->data_sent = true;
  89                         skb_pull(skb, INTF_HEADER_LEN);
  90                         ret = adapter->if_ops.host_to_card(adapter,
  91                                                            MWIFIEX_USB_EP_DATA,
  92                                                            skb, NULL);
  93                 } else {
  94                         ret = adapter->if_ops.host_to_card(adapter,
  95                                                            MWIFIEX_TYPE_DATA,
  96                                                            skb, tx_param);
  97                 }
  98         }
  99
 100         switch (ret) {
 101         case -ENOSR:
 102                 dev_err(adapter->dev, "data: -ENOSR is returned\n");
 103                 break;
 104         case -EBUSY:
 105                 if ((GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA) &&
 106                     (adapter->pps_uapsd_mode) && (adapter->tx_lock_flag)) {
 107                                 priv->adapter->tx_lock_flag = false;
 108                                 if (local_tx_pd)
 109                                         local_tx_pd->flags = 0;
 110                 }
 111                 dev_dbg(adapter->dev, "data: -EBUSY is returned\n");
 112                 break;
 113         case -1:
 114                 adapter->data_sent = false;
 115                 dev_err(adapter->dev, "mwifiex_write_data_async failed: 0x%X\n",
 116                         ret);
 117                 adapter->dbg.num_tx_host_to_card_failure++;
 118                 mwifiex_write_data_complete(adapter, skb, ret);
 119                 break;
 120         case -EINPROGRESS:
 121                 adapter->data_sent = false;
 122                 break;
 123         case 0:
 124                 mwifiex_write_data_complete(adapter, skb, ret);
 125                 break;
 126         default:
 127                 break;
 128         }
 129
 130         return ret;
 131 }
 132
 133 /*
 134  * Packet send completion callback handler.
 135  *
 136  * It either frees the buffer directly or forwards it to another
 137  * completion callback which checks conditions, updates statistics,
 138  * wakes up stalled traffic queue if required, and then frees the buffer.
 139  */
 140 int mwifiex_write_data_complete(struct mwifiex_adapter *adapter,
 141                                 struct sk_buff *skb, int status)
 142 {
 143         struct mwifiex_private *priv, *tpriv;
 144         struct mwifiex_txinfo *tx_info;
 145         int i;
 146
 147         if (!skb)
 148                 return 0;
 149
 150         tx_info = MWIFIEX_SKB_TXCB(skb);
 151         priv = mwifiex_get_priv_by_id(adapter, tx_info->bss_num,
 152                                       tx_info->bss_type);
 153         if (!priv)
 154                 goto done;
 155
 156         if (adapter->iface_type == MWIFIEX_USB)
 157                 adapter->data_sent = false;
 158
 159         mwifiex_set_trans_start(priv->netdev);
 160         if (!status) {
 161                 priv->stats.tx_packets++;
 162                 priv->stats.tx_bytes += skb->len;
 163         } else {
 164                 priv->stats.tx_errors++;
 165         }
 166
 167         if (tx_info->flags & MWIFIEX_BUF_FLAG_BRIDGED_PKT)
 168                 atomic_dec_return(&adapter->pending_bridged_pkts);
 169         if (atomic_dec_return(&adapter->tx_pending) >= LOW_TX_PENDING)
 170                 goto done;
 171
 172         for (i = 0; i < adapter->priv_num; i++) {
 173                 tpriv = adapter->priv[i];
 174
 175                 if (tpriv->media_connected &&
 176                     netif_queue_stopped(tpriv->netdev))
 177                         mwifiex_wake_up_net_dev_queue(tpriv->netdev, adapter);
 178         }
 179 done:
 180         dev_kfree_skb_any(skb);
 181
 182         return 0;
 183 }
 184 EXPORT_SYMBOL_GPL(mwifiex_write_data_complete);
 185