drivers/net/wireless/mwifiex/txrx.c

   1 /*
   2  * Marvell Wireless LAN device driver: generic TX/RX data handling
   3  *
   4  * Copyright (C) 2011-2014, 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         memset(rx_info, 0, sizeof(*rx_info));
  59         rx_info->bss_num = priv->bss_num;
  60         rx_info->bss_type = priv->bss_type;
  61
  62         if (priv->bss_role == MWIFIEX_BSS_ROLE_UAP)
  63                 ret = mwifiex_process_uap_rx_packet(priv, skb);
  64         else
  65                 ret = mwifiex_process_sta_rx_packet(priv, skb);
  66
  67         return ret;
  68 }
  69 EXPORT_SYMBOL_GPL(mwifiex_handle_rx_packet);
  70
  71 /*
  72  * This function sends a packet to device.
  73  *
  74  * It processes the packet to add the TxPD, checks condition and
  75  * sends the processed packet to firmware for transmission.
  76  *
  77  * On successful completion, the function calls the completion callback
  78  * and logs the time.
  79  */
  80 int mwifiex_process_tx(struct mwifiex_private *priv, struct sk_buff *skb,
  81                        struct mwifiex_tx_param *tx_param)
  82 {
  83         int ret = -1;
  84         struct mwifiex_adapter *adapter = priv->adapter;
  85         u8 *head_ptr;
  86         struct txpd *local_tx_pd = NULL;
  87
  88         if (priv->bss_role == MWIFIEX_BSS_ROLE_UAP)
  89                 head_ptr = mwifiex_process_uap_txpd(priv, skb);
  90         else
  91                 head_ptr = mwifiex_process_sta_txpd(priv, skb);
  92
  93         if (head_ptr) {
  94                 if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA)
  95                         local_tx_pd =
  96                                 (struct txpd *) (head_ptr + INTF_HEADER_LEN);
  97                 if (adapter->iface_type == MWIFIEX_USB) {
  98                         adapter->data_sent = true;
  99                         skb_pull(skb, INTF_HEADER_LEN);
 100                         ret = adapter->if_ops.host_to_card(adapter,
 101                                                            MWIFIEX_USB_EP_DATA,
 102                                                            skb, NULL);
 103                 } else {
 104                         ret = adapter->if_ops.host_to_card(adapter,
 105                                                            MWIFIEX_TYPE_DATA,
 106                                                            skb, tx_param);
 107                 }
 108         }
 109
 110         switch (ret) {
 111         case -ENOSR:
 112                 dev_dbg(adapter->dev, "data: -ENOSR is returned\n");
 113                 break;
 114         case -EBUSY:
 115                 if ((GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA) &&
 116                     (adapter->pps_uapsd_mode) && (adapter->tx_lock_flag)) {
 117                                 priv->adapter->tx_lock_flag = false;
 118                                 if (local_tx_pd)
 119                                         local_tx_pd->flags = 0;
 120                 }
 121                 dev_dbg(adapter->dev, "data: -EBUSY is returned\n");
 122                 break;
 123         case -1:
 124                 if (adapter->iface_type != MWIFIEX_PCIE)
 125                         adapter->data_sent = false;
 126                 dev_err(adapter->dev, "mwifiex_write_data_async failed: 0x%X\n",
 127                         ret);
 128                 adapter->dbg.num_tx_host_to_card_failure++;
 129                 mwifiex_write_data_complete(adapter, skb, 0, ret);
 130                 break;
 131         case -EINPROGRESS:
 132                 if (adapter->iface_type != MWIFIEX_PCIE)
 133                         adapter->data_sent = false;
 134                 break;
 135         case 0:
 136                 mwifiex_write_data_complete(adapter, skb, 0, ret);
 137                 break;
 138         default:
 139                 break;
 140         }
 141
 142         return ret;
 143 }
 144
 145 /*
 146  * Packet send completion callback handler.
 147  *
 148  * It either frees the buffer directly or forwards it to another
 149  * completion callback which checks conditions, updates statistics,
 150  * wakes up stalled traffic queue if required, and then frees the buffer.
 151  */
 152 int mwifiex_write_data_complete(struct mwifiex_adapter *adapter,
 153                                 struct sk_buff *skb, int aggr, int status)
 154 {
 155         struct mwifiex_private *priv;
 156         struct mwifiex_txinfo *tx_info;
 157         struct netdev_queue *txq;
 158         int index;
 159
 160         if (!skb)
 161                 return 0;
 162
 163         tx_info = MWIFIEX_SKB_TXCB(skb);
 164         priv = mwifiex_get_priv_by_id(adapter, tx_info->bss_num,
 165                                       tx_info->bss_type);
 166         if (!priv)
 167                 goto done;
 168
 169         if (adapter->iface_type == MWIFIEX_USB)
 170                 adapter->data_sent = false;
 171
 172         mwifiex_set_trans_start(priv->netdev);
 173         if (!status) {
 174                 priv->stats.tx_packets++;
 175                 priv->stats.tx_bytes += tx_info->pkt_len;
 176                 if (priv->tx_timeout_cnt)
 177                         priv->tx_timeout_cnt = 0;
 178         } else {
 179                 priv->stats.tx_errors++;
 180         }
 181
 182         if (tx_info->flags & MWIFIEX_BUF_FLAG_BRIDGED_PKT)
 183                 atomic_dec_return(&adapter->pending_bridged_pkts);
 184
 185         if (aggr)
 186                 /* For skb_aggr, do not wake up tx queue */
 187                 goto done;
 188
 189         atomic_dec(&adapter->tx_pending);
 190
 191         index = mwifiex_1d_to_wmm_queue[skb->priority];
 192         if (atomic_dec_return(&priv->wmm_tx_pending[index]) < LOW_TX_PENDING) {
 193                 txq = netdev_get_tx_queue(priv->netdev, index);
 194                 if (netif_tx_queue_stopped(txq)) {
 195                         netif_tx_wake_queue(txq);
 196                         dev_dbg(adapter->dev, "wake queue: %d\n", index);
 197                 }
 198         }
 199 done:
 200         dev_kfree_skb_any(skb);
 201
 202         return 0;
 203 }
 204 EXPORT_SYMBOL_GPL(mwifiex_write_data_complete);
 205
 206 void mwifiex_parse_tx_status_event(struct mwifiex_private *priv,
 207                                    void *event_body)
 208 {
 209         struct tx_status_event *tx_status = (void *)priv->adapter->event_body;
 210         struct sk_buff *ack_skb;
 211         unsigned long flags;
 212         struct mwifiex_txinfo *tx_info;
 213
 214         if (!tx_status->tx_token_id)
 215                 return;
 216
 217         spin_lock_irqsave(&priv->ack_status_lock, flags);
 218         ack_skb = idr_find(&priv->ack_status_frames, tx_status->tx_token_id);
 219         if (ack_skb)
 220                 idr_remove(&priv->ack_status_frames, tx_status->tx_token_id);
 221         spin_unlock_irqrestore(&priv->ack_status_lock, flags);
 222
 223         if (ack_skb) {
 224                 tx_info = MWIFIEX_SKB_TXCB(ack_skb);
 225
 226                 if (tx_info->flags & MWIFIEX_BUF_FLAG_EAPOL_TX_STATUS) {
 227                         /* consumes ack_skb */
 228                         skb_complete_wifi_ack(ack_skb, !tx_status->status);
 229                 } else {
 230                         cfg80211_mgmt_tx_status(priv->wdev, tx_info->cookie,
 231                                                 ack_skb->data, ack_skb->len,
 232                                                 !tx_status->status, GFP_ATOMIC);
 233                         dev_kfree_skb_any(ack_skb);
 234                 }
 235         }
 236 }