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         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 }
  72 EXPORT_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  */
  83 int 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_dbg(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  */
 155 int 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         }
 202 done:
 203         dev_kfree_skb_any(skb);
 204
 205         return 0;
 206 }
 207 EXPORT_SYMBOL_GPL(mwifiex_write_data_complete);
 208