drivers/net/wireless/mwifiex/uap_txrx.c

   1 /*
   2  * Marvell Wireless LAN device driver: AP TX and RX data handling
   3  *
   4  * Copyright (C) 2012, 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 "main.h"
  23 #include "wmm.h"
  24 #include "11n_aggr.h"
  25 #include "11n_rxreorder.h"
  26
  27 /* This function checks if particular RA list has packets more than low bridge
  28  * packet threshold and then deletes packet from this RA list.
  29  * Function deletes packets from such RA list and returns true. If no such list
  30  * is found, false is returned.
  31  */
  32 static bool
  33 mwifiex_uap_del_tx_pkts_in_ralist(struct mwifiex_private *priv,
  34                                   struct list_head *ra_list_head)
  35 {
  36         struct mwifiex_ra_list_tbl *ra_list;
  37         struct sk_buff *skb, *tmp;
  38         bool pkt_deleted = false;
  39         struct mwifiex_txinfo *tx_info;
  40         struct mwifiex_adapter *adapter = priv->adapter;
  41
  42         list_for_each_entry(ra_list, ra_list_head, list) {
  43                 if (skb_queue_empty(&ra_list->skb_head))
  44                         continue;
  45
  46                 skb_queue_walk_safe(&ra_list->skb_head, skb, tmp) {
  47                         tx_info = MWIFIEX_SKB_TXCB(skb);
  48                         if (tx_info->flags & MWIFIEX_BUF_FLAG_BRIDGED_PKT) {
  49                                 __skb_unlink(skb, &ra_list->skb_head);
  50                                 mwifiex_write_data_complete(adapter, skb, 0,
  51                                                             -1);
  52                                 atomic_dec(&priv->wmm.tx_pkts_queued);
  53                                 pkt_deleted = true;
  54                         }
  55                         if ((atomic_read(&adapter->pending_bridged_pkts) <=
  56                                              MWIFIEX_BRIDGED_PKTS_THR_LOW))
  57                                 break;
  58                 }
  59         }
  60
  61         return pkt_deleted;
  62 }
  63
  64 /* This function deletes packets from particular RA List. RA list index
  65  * from which packets are deleted is preserved so that packets from next RA
  66  * list are deleted upon subsequent call thus maintaining fairness.
  67  */
  68 static void mwifiex_uap_cleanup_tx_queues(struct mwifiex_private *priv)
  69 {
  70         unsigned long flags;
  71         struct list_head *ra_list;
  72         int i;
  73
  74         spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags);
  75
  76         for (i = 0; i < MAX_NUM_TID; i++, priv->del_list_idx++) {
  77                 if (priv->del_list_idx == MAX_NUM_TID)
  78                         priv->del_list_idx = 0;
  79                 ra_list = &priv->wmm.tid_tbl_ptr[priv->del_list_idx].ra_list;
  80                 if (mwifiex_uap_del_tx_pkts_in_ralist(priv, ra_list)) {
  81                         priv->del_list_idx++;
  82                         break;
  83                 }
  84         }
  85
  86         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
  87 }
  88
  89
  90 static void mwifiex_uap_queue_bridged_pkt(struct mwifiex_private *priv,
  91                                          struct sk_buff *skb)
  92 {
  93         struct mwifiex_adapter *adapter = priv->adapter;
  94         struct uap_rxpd *uap_rx_pd;
  95         struct rx_packet_hdr *rx_pkt_hdr;
  96         struct sk_buff *new_skb;
  97         struct mwifiex_txinfo *tx_info;
  98         int hdr_chop;
  99         struct timeval tv;
 100         u8 rfc1042_eth_hdr[ETH_ALEN] = { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
 101
 102         uap_rx_pd = (struct uap_rxpd *)(skb->data);
 103         rx_pkt_hdr = (void *)uap_rx_pd + le16_to_cpu(uap_rx_pd->rx_pkt_offset);
 104
 105         if ((atomic_read(&adapter->pending_bridged_pkts) >=
 106                                              MWIFIEX_BRIDGED_PKTS_THR_HIGH)) {
 107                 dev_err(priv->adapter->dev,
 108                         "Tx: Bridge packet limit reached. Drop packet!\n");
 109                 kfree_skb(skb);
 110                 mwifiex_uap_cleanup_tx_queues(priv);
 111                 return;
 112         }
 113
 114         if (!memcmp(&rx_pkt_hdr->rfc1042_hdr,
 115                     rfc1042_eth_hdr, sizeof(rfc1042_eth_hdr)))
 116                 /* Chop off the rxpd + the excess memory from
 117                  * 802.2/llc/snap header that was removed.
 118                  */
 119                 hdr_chop = (u8 *)eth_hdr - (u8 *)uap_rx_pd;
 120         else
 121                 /* Chop off the rxpd */
 122                 hdr_chop = (u8 *)&rx_pkt_hdr->eth803_hdr - (u8 *)uap_rx_pd;
 123
 124         /* Chop off the leading header bytes so the it points
 125          * to the start of either the reconstructed EthII frame
 126          * or the 802.2/llc/snap frame.
 127          */
 128         skb_pull(skb, hdr_chop);
 129
 130         if (skb_headroom(skb) < MWIFIEX_MIN_DATA_HEADER_LEN) {
 131                 dev_dbg(priv->adapter->dev,
 132                         "data: Tx: insufficient skb headroom %d\n",
 133                         skb_headroom(skb));
 134                 /* Insufficient skb headroom - allocate a new skb */
 135                 new_skb =
 136                         skb_realloc_headroom(skb, MWIFIEX_MIN_DATA_HEADER_LEN);
 137                 if (unlikely(!new_skb)) {
 138                         dev_err(priv->adapter->dev,
 139                                 "Tx: cannot allocate new_skb\n");
 140                         kfree_skb(skb);
 141                         priv->stats.tx_dropped++;
 142                         return;
 143                 }
 144
 145                 kfree_skb(skb);
 146                 skb = new_skb;
 147                 dev_dbg(priv->adapter->dev, "info: new skb headroom %d\n",
 148                         skb_headroom(skb));
 149         }
 150
 151         tx_info = MWIFIEX_SKB_TXCB(skb);
 152         tx_info->bss_num = priv->bss_num;
 153         tx_info->bss_type = priv->bss_type;
 154         tx_info->flags |= MWIFIEX_BUF_FLAG_BRIDGED_PKT;
 155
 156         do_gettimeofday(&tv);
 157         skb->tstamp = timeval_to_ktime(tv);
 158         mwifiex_wmm_add_buf_txqueue(priv, skb);
 159         atomic_inc(&adapter->tx_pending);
 160         atomic_inc(&adapter->pending_bridged_pkts);
 161
 162         return;
 163 }
 164
 165 /*
 166  * This function contains logic for AP packet forwarding.
 167  *
 168  * If a packet is multicast/broadcast, it is sent to kernel/upper layer
 169  * as well as queued back to AP TX queue so that it can be sent to other
 170  * associated stations.
 171  * If a packet is unicast and RA is present in associated station list,
 172  * it is again requeued into AP TX queue.
 173  * If a packet is unicast and RA is not in associated station list,
 174  * packet is forwarded to kernel to handle routing logic.
 175  */
 176 int mwifiex_handle_uap_rx_forward(struct mwifiex_private *priv,
 177                                   struct sk_buff *skb)
 178 {
 179         struct mwifiex_adapter *adapter = priv->adapter;
 180         struct uap_rxpd *uap_rx_pd;
 181         struct rx_packet_hdr *rx_pkt_hdr;
 182         u8 ra[ETH_ALEN];
 183         struct sk_buff *skb_uap;
 184
 185         uap_rx_pd = (struct uap_rxpd *)(skb->data);
 186         rx_pkt_hdr = (void *)uap_rx_pd + le16_to_cpu(uap_rx_pd->rx_pkt_offset);
 187
 188         /* don't do packet forwarding in disconnected state */
 189         if (!priv->media_connected) {
 190                 dev_err(adapter->dev, "drop packet in disconnected state.\n");
 191                 dev_kfree_skb_any(skb);
 192                 return 0;
 193         }
 194
 195         memcpy(ra, rx_pkt_hdr->eth803_hdr.h_dest, ETH_ALEN);
 196
 197         if (is_multicast_ether_addr(ra)) {
 198                 skb_uap = skb_copy(skb, GFP_ATOMIC);
 199                 mwifiex_uap_queue_bridged_pkt(priv, skb_uap);
 200         } else {
 201                 if (mwifiex_get_sta_entry(priv, ra)) {
 202                         /* Requeue Intra-BSS packet */
 203                         mwifiex_uap_queue_bridged_pkt(priv, skb);
 204                         return 0;
 205                 }
 206         }
 207
 208         /* Forward unicat/Inter-BSS packets to kernel. */
 209         return mwifiex_process_rx_packet(priv, skb);
 210 }
 211
 212 /*
 213  * This function processes the packet received on AP interface.
 214  *
 215  * The function looks into the RxPD and performs sanity tests on the
 216  * received buffer to ensure its a valid packet before processing it
 217  * further. If the packet is determined to be aggregated, it is
 218  * de-aggregated accordingly. Then skb is passed to AP packet forwarding logic.
 219  *
 220  * The completion callback is called after processing is complete.
 221  */
 222 int mwifiex_process_uap_rx_packet(struct mwifiex_private *priv,
 223                                   struct sk_buff *skb)
 224 {
 225         struct mwifiex_adapter *adapter = priv->adapter;
 226         int ret;
 227         struct uap_rxpd *uap_rx_pd;
 228         struct rx_packet_hdr *rx_pkt_hdr;
 229         u16 rx_pkt_type;
 230         u8 ta[ETH_ALEN], pkt_type;
 231         struct mwifiex_sta_node *node;
 232
 233         uap_rx_pd = (struct uap_rxpd *)(skb->data);
 234         rx_pkt_type = le16_to_cpu(uap_rx_pd->rx_pkt_type);
 235         rx_pkt_hdr = (void *)uap_rx_pd + le16_to_cpu(uap_rx_pd->rx_pkt_offset);
 236
 237         if ((le16_to_cpu(uap_rx_pd->rx_pkt_offset) +
 238              le16_to_cpu(uap_rx_pd->rx_pkt_length)) > (u16) skb->len) {
 239                 dev_err(adapter->dev,
 240                         "wrong rx packet: len=%d, offset=%d, length=%d\n",
 241                         skb->len, le16_to_cpu(uap_rx_pd->rx_pkt_offset),
 242                         le16_to_cpu(uap_rx_pd->rx_pkt_length));
 243                 priv->stats.rx_dropped++;
 244
 245                 if (adapter->if_ops.data_complete)
 246                         adapter->if_ops.data_complete(adapter, skb);
 247                 else
 248                         dev_kfree_skb_any(skb);
 249
 250                 return 0;
 251         }
 252
 253         if (le16_to_cpu(uap_rx_pd->rx_pkt_type) == PKT_TYPE_AMSDU) {
 254                 struct sk_buff_head list;
 255                 struct sk_buff *rx_skb;
 256
 257                 __skb_queue_head_init(&list);
 258                 skb_pull(skb, le16_to_cpu(uap_rx_pd->rx_pkt_offset));
 259                 skb_trim(skb, le16_to_cpu(uap_rx_pd->rx_pkt_length));
 260
 261                 ieee80211_amsdu_to_8023s(skb, &list, priv->curr_addr,
 262                                          priv->wdev->iftype, 0, false);
 263
 264                 while (!skb_queue_empty(&list)) {
 265                         rx_skb = __skb_dequeue(&list);
 266                         ret = mwifiex_recv_packet(priv, rx_skb);
 267                         if (ret)
 268                                 dev_err(adapter->dev,
 269                                         "AP:Rx A-MSDU failed");
 270                 }
 271
 272                 return 0;
 273         } else if (rx_pkt_type == PKT_TYPE_MGMT) {
 274                 ret = mwifiex_process_mgmt_packet(priv, skb);
 275                 if (ret)
 276                         dev_err(adapter->dev, "Rx of mgmt packet failed");
 277                 dev_kfree_skb_any(skb);
 278                 return ret;
 279         }
 280
 281         memcpy(ta, rx_pkt_hdr->eth803_hdr.h_source, ETH_ALEN);
 282
 283         if (rx_pkt_type != PKT_TYPE_BAR && uap_rx_pd->priority < MAX_NUM_TID) {
 284                 node = mwifiex_get_sta_entry(priv, ta);
 285                 if (node)
 286                         node->rx_seq[uap_rx_pd->priority] =
 287                                                 le16_to_cpu(uap_rx_pd->seq_num);
 288         }
 289
 290         if (!priv->ap_11n_enabled ||
 291             (!mwifiex_11n_get_rx_reorder_tbl(priv, uap_rx_pd->priority, ta) &&
 292             (le16_to_cpu(uap_rx_pd->rx_pkt_type) != PKT_TYPE_AMSDU))) {
 293                 ret = mwifiex_handle_uap_rx_forward(priv, skb);
 294                 return ret;
 295         }
 296
 297         /* Reorder and send to kernel */
 298         pkt_type = (u8)le16_to_cpu(uap_rx_pd->rx_pkt_type);
 299         ret = mwifiex_11n_rx_reorder_pkt(priv, le16_to_cpu(uap_rx_pd->seq_num),
 300                                          uap_rx_pd->priority, ta, pkt_type,
 301                                          skb);
 302
 303         if (ret || (rx_pkt_type == PKT_TYPE_BAR)) {
 304                 if (adapter->if_ops.data_complete)
 305                         adapter->if_ops.data_complete(adapter, skb);
 306                 else
 307                         dev_kfree_skb_any(skb);
 308         }
 309
 310         if (ret)
 311                 priv->stats.rx_dropped++;
 312
 313         return ret;
 314 }
 315
 316 /*
 317  * This function fills the TxPD for AP tx packets.
 318  *
 319  * The Tx buffer received by this function should already have the
 320  * header space allocated for TxPD.
 321  *
 322  * This function inserts the TxPD in between interface header and actual
 323  * data and adjusts the buffer pointers accordingly.
 324  *
 325  * The following TxPD fields are set by this function, as required -
 326  *      - BSS number
 327  *      - Tx packet length and offset
 328  *      - Priority
 329  *      - Packet delay
 330  *      - Priority specific Tx control
 331  *      - Flags
 332  */
 333 void *mwifiex_process_uap_txpd(struct mwifiex_private *priv,
 334                                struct sk_buff *skb)
 335 {
 336         struct mwifiex_adapter *adapter = priv->adapter;
 337         struct uap_txpd *txpd;
 338         struct mwifiex_txinfo *tx_info = MWIFIEX_SKB_TXCB(skb);
 339         int pad, len;
 340         u16 pkt_type;
 341
 342         if (!skb->len) {
 343                 dev_err(adapter->dev, "Tx: bad packet length: %d\n", skb->len);
 344                 tx_info->status_code = -1;
 345                 return skb->data;
 346         }
 347
 348         pkt_type = mwifiex_is_skb_mgmt_frame(skb) ? PKT_TYPE_MGMT : 0;
 349
 350         /* If skb->data is not aligned, add padding */
 351         pad = (4 - (((void *)skb->data - NULL) & 0x3)) % 4;
 352
 353         len = sizeof(*txpd) + pad;
 354
 355         BUG_ON(skb_headroom(skb) < len + INTF_HEADER_LEN);
 356
 357         skb_push(skb, len);
 358
 359         txpd = (struct uap_txpd *)skb->data;
 360         memset(txpd, 0, sizeof(*txpd));
 361         txpd->bss_num = priv->bss_num;
 362         txpd->bss_type = priv->bss_type;
 363         txpd->tx_pkt_length = cpu_to_le16((u16)(skb->len - len));
 364
 365         txpd->priority = (u8)skb->priority;
 366         txpd->pkt_delay_2ms = mwifiex_wmm_compute_drv_pkt_delay(priv, skb);
 367
 368         if (txpd->priority < ARRAY_SIZE(priv->wmm.user_pri_pkt_tx_ctrl))
 369                 /*
 370                  * Set the priority specific tx_control field, setting of 0 will
 371                  * cause the default value to be used later in this function.
 372                  */
 373                 txpd->tx_control =
 374                     cpu_to_le32(priv->wmm.user_pri_pkt_tx_ctrl[txpd->priority]);
 375
 376         /* Offset of actual data */
 377         if (pkt_type == PKT_TYPE_MGMT) {
 378                 /* Set the packet type and add header for management frame */
 379                 txpd->tx_pkt_type = cpu_to_le16(pkt_type);
 380                 len += MWIFIEX_MGMT_FRAME_HEADER_SIZE;
 381         }
 382
 383         txpd->tx_pkt_offset = cpu_to_le16(len);
 384
 385         /* make space for INTF_HEADER_LEN */
 386         skb_push(skb, INTF_HEADER_LEN);
 387
 388         if (!txpd->tx_control)
 389                 /* TxCtrl set by user or default */
 390                 txpd->tx_control = cpu_to_le32(priv->pkt_tx_ctrl);
 391
 392         return skb->data;
 393 }