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                 mwifiex_dbg(adapter, ERROR,
  54                             "data: priv not found. Drop RX packet\n");
  55                 dev_kfree_skb_any(skb);
  56                 return -1;
  57         }
  58
  59         mwifiex_dbg_dump(adapter, DAT_D, "rx pkt:", skb->data,
  60                          min_t(size_t, skb->len, DEBUG_DUMP_DATA_MAX_LEN));
  61
  62         memset(rx_info, 0, sizeof(*rx_info));
  63         rx_info->bss_num = priv->bss_num;
  64         rx_info->bss_type = priv->bss_type;
  65
  66         if (priv->bss_role == MWIFIEX_BSS_ROLE_UAP)
  67                 ret = mwifiex_process_uap_rx_packet(priv, skb);
  68         else
  69                 ret = mwifiex_process_sta_rx_packet(priv, skb);
  70
  71         return ret;
  72 }
  73 EXPORT_SYMBOL_GPL(mwifiex_handle_rx_packet);
  74
  75 /*
  76  * This function sends a packet to device.
  77  *
  78  * It processes the packet to add the TxPD, checks condition and
  79  * sends the processed packet to firmware for transmission.
  80  *
  81  * On successful completion, the function calls the completion callback
  82  * and logs the time.
  83  */
  84 int mwifiex_process_tx(struct mwifiex_private *priv, struct sk_buff *skb,
  85                        struct mwifiex_tx_param *tx_param)
  86 {
  87         int hroom, ret = -1;
  88         struct mwifiex_adapter *adapter = priv->adapter;
  89         u8 *head_ptr;
  90         struct txpd *local_tx_pd = NULL;
  91         struct mwifiex_sta_node *dest_node;
  92         struct ethhdr *hdr = (void *)skb->data;
  93
  94         hroom = (adapter->iface_type == MWIFIEX_USB) ? 0 : INTF_HEADER_LEN;
  95
  96         if (priv->bss_role == MWIFIEX_BSS_ROLE_UAP) {
  97                 dest_node = mwifiex_get_sta_entry(priv, hdr->h_dest);
  98                 if (dest_node) {
  99                         dest_node->stats.tx_bytes += skb->len;
 100                         dest_node->stats.tx_packets++;
 101                 }
 102
 103                 head_ptr = mwifiex_process_uap_txpd(priv, skb);
 104         } else {
 105                 head_ptr = mwifiex_process_sta_txpd(priv, skb);
 106         }
 107
 108         if ((adapter->data_sent || adapter->tx_lock_flag) && head_ptr) {
 109                 skb_queue_tail(&adapter->tx_data_q, skb);
 110                 atomic_inc(&adapter->tx_queued);
 111                 return 0;
 112         }
 113
 114         if (head_ptr) {
 115                 if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA)
 116                         local_tx_pd = (struct txpd *)(head_ptr + hroom);
 117                 if (adapter->iface_type == MWIFIEX_USB) {
 118                         ret = adapter->if_ops.host_to_card(adapter,
 119                                                            priv->usb_port,
 120                                                            skb, NULL);
 121                 } else {
 122                         ret = adapter->if_ops.host_to_card(adapter,
 123                                                            MWIFIEX_TYPE_DATA,
 124                                                            skb, tx_param);
 125                 }
 126         }
 127         mwifiex_dbg_dump(adapter, DAT_D, "tx pkt:", skb->data,
 128                          min_t(size_t, skb->len, DEBUG_DUMP_DATA_MAX_LEN));
 129
 130         switch (ret) {
 131         case -ENOSR:
 132                 mwifiex_dbg(adapter, DATA, "data: -ENOSR is returned\n");
 133                 break;
 134         case -EBUSY:
 135                 if ((GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA) &&
 136                     (adapter->pps_uapsd_mode) && (adapter->tx_lock_flag)) {
 137                                 priv->adapter->tx_lock_flag = false;
 138                                 if (local_tx_pd)
 139                                         local_tx_pd->flags = 0;
 140                 }
 141                 mwifiex_dbg(adapter, ERROR, "data: -EBUSY is returned\n");
 142                 break;
 143         case -1:
 144                 mwifiex_dbg(adapter, ERROR,
 145                             "mwifiex_write_data_async failed: 0x%X\n",
 146                             ret);
 147                 adapter->dbg.num_tx_host_to_card_failure++;
 148                 mwifiex_write_data_complete(adapter, skb, 0, ret);
 149                 break;
 150         case -EINPROGRESS:
 151                 break;
 152         case 0:
 153                 mwifiex_write_data_complete(adapter, skb, 0, ret);
 154                 break;
 155         default:
 156                 break;
 157         }
 158
 159         return ret;
 160 }
 161
 162 static int mwifiex_host_to_card(struct mwifiex_adapter *adapter,
 163                                 struct sk_buff *skb,
 164                                 struct mwifiex_tx_param *tx_param)
 165 {
 166         struct txpd *local_tx_pd = NULL;
 167         u8 *head_ptr = skb->data;
 168         int ret = 0;
 169         struct mwifiex_private *priv;
 170         struct mwifiex_txinfo *tx_info;
 171
 172         tx_info = MWIFIEX_SKB_TXCB(skb);
 173         priv = mwifiex_get_priv_by_id(adapter, tx_info->bss_num,
 174                                       tx_info->bss_type);
 175         if (!priv) {
 176                 mwifiex_dbg(adapter, ERROR,
 177                             "data: priv not found. Drop TX packet\n");
 178                 adapter->dbg.num_tx_host_to_card_failure++;
 179                 mwifiex_write_data_complete(adapter, skb, 0, 0);
 180                 return ret;
 181         }
 182         if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA) {
 183                 if (adapter->iface_type == MWIFIEX_USB)
 184                         local_tx_pd = (struct txpd *)head_ptr;
 185                 else
 186                         local_tx_pd = (struct txpd *) (head_ptr +
 187                                 INTF_HEADER_LEN);
 188         }
 189
 190         if (adapter->iface_type == MWIFIEX_USB) {
 191                 ret = adapter->if_ops.host_to_card(adapter,
 192                                                    priv->usb_port,
 193                                                    skb, NULL);
 194         } else {
 195                 ret = adapter->if_ops.host_to_card(adapter,
 196                                                    MWIFIEX_TYPE_DATA,
 197                                                    skb, tx_param);
 198         }
 199         switch (ret) {
 200         case -ENOSR:
 201                 mwifiex_dbg(adapter, ERROR, "data: -ENOSR is returned\n");
 202                 break;
 203         case -EBUSY:
 204                 if ((GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA) &&
 205                     (adapter->pps_uapsd_mode) &&
 206                     (adapter->tx_lock_flag)) {
 207                         priv->adapter->tx_lock_flag = false;
 208                         if (local_tx_pd)
 209                                 local_tx_pd->flags = 0;
 210                 }
 211                 skb_queue_head(&adapter->tx_data_q, skb);
 212                 if (tx_info->flags & MWIFIEX_BUF_FLAG_AGGR_PKT)
 213                         atomic_add(tx_info->aggr_num, &adapter->tx_queued);
 214                 else
 215                         atomic_inc(&adapter->tx_queued);
 216                 mwifiex_dbg(adapter, ERROR, "data: -EBUSY is returned\n");
 217                 break;
 218         case -1:
 219                 mwifiex_dbg(adapter, ERROR,
 220                             "mwifiex_write_data_async failed: 0x%X\n", ret);
 221                 adapter->dbg.num_tx_host_to_card_failure++;
 222                 mwifiex_write_data_complete(adapter, skb, 0, ret);
 223                 break;
 224         case -EINPROGRESS:
 225                 break;
 226         case 0:
 227                 mwifiex_write_data_complete(adapter, skb, 0, ret);
 228                 break;
 229         default:
 230                 break;
 231         }
 232         return ret;
 233 }
 234
 235 static int
 236 mwifiex_dequeue_tx_queue(struct mwifiex_adapter *adapter)
 237 {
 238         struct sk_buff *skb, *skb_next;
 239         struct mwifiex_txinfo *tx_info;
 240         struct mwifiex_tx_param tx_param;
 241
 242         skb = skb_dequeue(&adapter->tx_data_q);
 243         if (!skb)
 244                 return -1;
 245
 246         tx_info = MWIFIEX_SKB_TXCB(skb);
 247         if (tx_info->flags & MWIFIEX_BUF_FLAG_AGGR_PKT)
 248                 atomic_sub(tx_info->aggr_num, &adapter->tx_queued);
 249         else
 250                 atomic_dec(&adapter->tx_queued);
 251
 252         if (!skb_queue_empty(&adapter->tx_data_q))
 253                 skb_next = skb_peek(&adapter->tx_data_q);
 254         else
 255                 skb_next = NULL;
 256         tx_param.next_pkt_len = ((skb_next) ? skb_next->len : 0);
 257         if (!tx_param.next_pkt_len) {
 258                 if (!mwifiex_wmm_lists_empty(adapter))
 259                         tx_param.next_pkt_len = 1;
 260         }
 261         return mwifiex_host_to_card(adapter, skb, &tx_param);
 262 }
 263
 264 void
 265 mwifiex_process_tx_queue(struct mwifiex_adapter *adapter)
 266 {
 267         do {
 268                 if (adapter->data_sent || adapter->tx_lock_flag)
 269                         break;
 270                 if (mwifiex_dequeue_tx_queue(adapter))
 271                         break;
 272         } while (!skb_queue_empty(&adapter->tx_data_q));
 273 }
 274
 275 /*
 276  * Packet send completion callback handler.
 277  *
 278  * It either frees the buffer directly or forwards it to another
 279  * completion callback which checks conditions, updates statistics,
 280  * wakes up stalled traffic queue if required, and then frees the buffer.
 281  */
 282 int mwifiex_write_data_complete(struct mwifiex_adapter *adapter,
 283                                 struct sk_buff *skb, int aggr, int status)
 284 {
 285         struct mwifiex_private *priv;
 286         struct mwifiex_txinfo *tx_info;
 287         struct netdev_queue *txq;
 288         int index;
 289
 290         if (!skb)
 291                 return 0;
 292
 293         tx_info = MWIFIEX_SKB_TXCB(skb);
 294         priv = mwifiex_get_priv_by_id(adapter, tx_info->bss_num,
 295                                       tx_info->bss_type);
 296         if (!priv)
 297                 goto done;
 298
 299         mwifiex_set_trans_start(priv->netdev);
 300         if (!status) {
 301                 priv->stats.tx_packets++;
 302                 priv->stats.tx_bytes += tx_info->pkt_len;
 303                 if (priv->tx_timeout_cnt)
 304                         priv->tx_timeout_cnt = 0;
 305         } else {
 306                 priv->stats.tx_errors++;
 307         }
 308
 309         if (tx_info->flags & MWIFIEX_BUF_FLAG_BRIDGED_PKT)
 310                 atomic_dec_return(&adapter->pending_bridged_pkts);
 311
 312         if (tx_info->flags & MWIFIEX_BUF_FLAG_AGGR_PKT)
 313                 goto done;
 314
 315         if (aggr)
 316                 /* For skb_aggr, do not wake up tx queue */
 317                 goto done;
 318
 319         atomic_dec(&adapter->tx_pending);
 320
 321         index = mwifiex_1d_to_wmm_queue[skb->priority];
 322         if (atomic_dec_return(&priv->wmm_tx_pending[index]) < LOW_TX_PENDING) {
 323                 txq = netdev_get_tx_queue(priv->netdev, index);
 324                 if (netif_tx_queue_stopped(txq)) {
 325                         netif_tx_wake_queue(txq);
 326                         mwifiex_dbg(adapter, DATA, "wake queue: %d\n", index);
 327                 }
 328         }
 329 done:
 330         dev_kfree_skb_any(skb);
 331
 332         return 0;
 333 }
 334 EXPORT_SYMBOL_GPL(mwifiex_write_data_complete);
 335
 336 void mwifiex_parse_tx_status_event(struct mwifiex_private *priv,
 337                                    void *event_body)
 338 {
 339         struct tx_status_event *tx_status = (void *)priv->adapter->event_body;
 340         struct sk_buff *ack_skb;
 341         unsigned long flags;
 342         struct mwifiex_txinfo *tx_info;
 343
 344         if (!tx_status->tx_token_id)
 345                 return;
 346
 347         spin_lock_irqsave(&priv->ack_status_lock, flags);
 348         ack_skb = idr_find(&priv->ack_status_frames, tx_status->tx_token_id);
 349         if (ack_skb)
 350                 idr_remove(&priv->ack_status_frames, tx_status->tx_token_id);
 351         spin_unlock_irqrestore(&priv->ack_status_lock, flags);
 352
 353         if (ack_skb) {
 354                 tx_info = MWIFIEX_SKB_TXCB(ack_skb);
 355
 356                 if (tx_info->flags & MWIFIEX_BUF_FLAG_EAPOL_TX_STATUS) {
 357                         /* consumes ack_skb */
 358                         skb_complete_wifi_ack(ack_skb, !tx_status->status);
 359                 } else {
 360                         /* Remove broadcast address which was added by driver */
 361                         memmove(ack_skb->data +
 362                                 sizeof(struct ieee80211_hdr_3addr) +
 363                                 MWIFIEX_MGMT_FRAME_HEADER_SIZE + sizeof(u16),
 364                                 ack_skb->data +
 365                                 sizeof(struct ieee80211_hdr_3addr) +
 366                                 MWIFIEX_MGMT_FRAME_HEADER_SIZE + sizeof(u16) +
 367                                 ETH_ALEN, ack_skb->len -
 368                                 (sizeof(struct ieee80211_hdr_3addr) +
 369                                 MWIFIEX_MGMT_FRAME_HEADER_SIZE + sizeof(u16) +
 370                                 ETH_ALEN));
 371                         ack_skb->len = ack_skb->len - ETH_ALEN;
 372                         /* Remove driver's proprietary header including 2 bytes
 373                          * of packet length and pass actual management frame buffer
 374                          * to cfg80211.
 375                          */
 376                         cfg80211_mgmt_tx_status(&priv->wdev, tx_info->cookie,
 377                                                 ack_skb->data +
 378                                                 MWIFIEX_MGMT_FRAME_HEADER_SIZE +
 379                                                 sizeof(u16), ack_skb->len -
 380                                                 (MWIFIEX_MGMT_FRAME_HEADER_SIZE
 381                                                  + sizeof(u16)),
 382                                                 !tx_status->status, GFP_ATOMIC);
 383                         dev_kfree_skb_any(ack_skb);
 384                 }
 385         }
 386 }