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         struct ethhdr *p_ethhdr;
 101         u8 rfc1042_eth_hdr[ETH_ALEN] = { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
 102
 103         uap_rx_pd = (struct uap_rxpd *)(skb->data);
 104         rx_pkt_hdr = (void *)uap_rx_pd + le16_to_cpu(uap_rx_pd->rx_pkt_offset);
 105
 106         if ((atomic_read(&adapter->pending_bridged_pkts) >=
 107                                              MWIFIEX_BRIDGED_PKTS_THR_HIGH)) {
 108                 dev_err(priv->adapter->dev,
 109                         "Tx: Bridge packet limit reached. Drop packet!\n");
 110                 kfree_skb(skb);
 111                 mwifiex_uap_cleanup_tx_queues(priv);
 112                 return;
 113         }
 114
 115         if (!memcmp(&rx_pkt_hdr->rfc1042_hdr,
 116                     rfc1042_eth_hdr, sizeof(rfc1042_eth_hdr))) {
 117                 /* Replace the 803 header and rfc1042 header (llc/snap) with
 118                  * an Ethernet II header, keep the src/dst and snap_type
 119                  * (ethertype).
 120                  *
 121                  * The firmware only passes up SNAP frames converting all RX
 122                  * data from 802.11 to 802.2/LLC/SNAP frames.
 123                  *
 124                  * To create the Ethernet II, just move the src, dst address
 125                  * right before the snap_type.
 126                  */
 127                 p_ethhdr = (struct ethhdr *)
 128                         ((u8 *)(&rx_pkt_hdr->eth803_hdr)
 129                          + sizeof(rx_pkt_hdr->eth803_hdr)
 130                          + sizeof(rx_pkt_hdr->rfc1042_hdr)
 131                          - sizeof(rx_pkt_hdr->eth803_hdr.h_dest)
 132                          - sizeof(rx_pkt_hdr->eth803_hdr.h_source)
 133                          - sizeof(rx_pkt_hdr->rfc1042_hdr.snap_type));
 134                 memcpy(p_ethhdr->h_source, rx_pkt_hdr->eth803_hdr.h_source,
 135                        sizeof(p_ethhdr->h_source));
 136                 memcpy(p_ethhdr->h_dest, rx_pkt_hdr->eth803_hdr.h_dest,
 137                        sizeof(p_ethhdr->h_dest));
 138                 /* Chop off the rxpd + the excess memory from
 139                  * 802.2/llc/snap header that was removed.
 140                  */
 141                 hdr_chop = (u8 *)p_ethhdr - (u8 *)uap_rx_pd;
 142         } else {
 143                 /* Chop off the rxpd */
 144                 hdr_chop = (u8 *)&rx_pkt_hdr->eth803_hdr - (u8 *)uap_rx_pd;
 145         }
 146
 147         /* Chop off the leading header bytes so the it points
 148          * to the start of either the reconstructed EthII frame
 149          * or the 802.2/llc/snap frame.
 150          */
 151         skb_pull(skb, hdr_chop);
 152
 153         if (skb_headroom(skb) < MWIFIEX_MIN_DATA_HEADER_LEN) {
 154                 dev_dbg(priv->adapter->dev,
 155                         "data: Tx: insufficient skb headroom %d\n",
 156                         skb_headroom(skb));
 157                 /* Insufficient skb headroom - allocate a new skb */
 158                 new_skb =
 159                         skb_realloc_headroom(skb, MWIFIEX_MIN_DATA_HEADER_LEN);
 160                 if (unlikely(!new_skb)) {
 161                         dev_err(priv->adapter->dev,
 162                                 "Tx: cannot allocate new_skb\n");
 163                         kfree_skb(skb);
 164                         priv->stats.tx_dropped++;
 165                         return;
 166                 }
 167
 168                 kfree_skb(skb);
 169                 skb = new_skb;
 170                 dev_dbg(priv->adapter->dev, "info: new skb headroom %d\n",
 171                         skb_headroom(skb));
 172         }
 173
 174         tx_info = MWIFIEX_SKB_TXCB(skb);
 175         tx_info->bss_num = priv->bss_num;
 176         tx_info->bss_type = priv->bss_type;
 177         tx_info->flags |= MWIFIEX_BUF_FLAG_BRIDGED_PKT;
 178
 179         do_gettimeofday(&tv);
 180         skb->tstamp = timeval_to_ktime(tv);
 181         mwifiex_wmm_add_buf_txqueue(priv, skb);
 182         atomic_inc(&adapter->tx_pending);
 183         atomic_inc(&adapter->pending_bridged_pkts);
 184
 185         return;
 186 }
 187
 188 /*
 189  * This function contains logic for AP packet forwarding.
 190  *
 191  * If a packet is multicast/broadcast, it is sent to kernel/upper layer
 192  * as well as queued back to AP TX queue so that it can be sent to other
 193  * associated stations.
 194  * If a packet is unicast and RA is present in associated station list,
 195  * it is again requeued into AP TX queue.
 196  * If a packet is unicast and RA is not in associated station list,
 197  * packet is forwarded to kernel to handle routing logic.
 198  */
 199 int mwifiex_handle_uap_rx_forward(struct mwifiex_private *priv,
 200                                   struct sk_buff *skb)
 201 {
 202         struct mwifiex_adapter *adapter = priv->adapter;
 203         struct uap_rxpd *uap_rx_pd;
 204         struct rx_packet_hdr *rx_pkt_hdr;
 205         u8 ra[ETH_ALEN];
 206         struct sk_buff *skb_uap;
 207
 208         uap_rx_pd = (struct uap_rxpd *)(skb->data);
 209         rx_pkt_hdr = (void *)uap_rx_pd + le16_to_cpu(uap_rx_pd->rx_pkt_offset);
 210
 211         /* don't do packet forwarding in disconnected state */
 212         if (!priv->media_connected) {
 213                 dev_err(adapter->dev, "drop packet in disconnected state.\n");
 214                 dev_kfree_skb_any(skb);
 215                 return 0;
 216         }
 217
 218         memcpy(ra, rx_pkt_hdr->eth803_hdr.h_dest, ETH_ALEN);
 219
 220         if (is_multicast_ether_addr(ra)) {
 221                 skb_uap = skb_copy(skb, GFP_ATOMIC);
 222                 mwifiex_uap_queue_bridged_pkt(priv, skb_uap);
 223         } else {
 224                 if (mwifiex_get_sta_entry(priv, ra)) {
 225                         /* Requeue Intra-BSS packet */
 226                         mwifiex_uap_queue_bridged_pkt(priv, skb);
 227                         return 0;
 228                 }
 229         }
 230
 231         /* Forward unicat/Inter-BSS packets to kernel. */
 232         return mwifiex_process_rx_packet(priv, skb);
 233 }
 234
 235 /*
 236  * This function processes the packet received on AP interface.
 237  *
 238  * The function looks into the RxPD and performs sanity tests on the
 239  * received buffer to ensure its a valid packet before processing it
 240  * further. If the packet is determined to be aggregated, it is
 241  * de-aggregated accordingly. Then skb is passed to AP packet forwarding logic.
 242  *
 243  * The completion callback is called after processing is complete.
 244  */
 245 int mwifiex_process_uap_rx_packet(struct mwifiex_private *priv,
 246                                   struct sk_buff *skb)
 247 {
 248         struct mwifiex_adapter *adapter = priv->adapter;
 249         int ret;
 250         struct uap_rxpd *uap_rx_pd;
 251         struct rx_packet_hdr *rx_pkt_hdr;
 252         u16 rx_pkt_type;
 253         u8 ta[ETH_ALEN], pkt_type;
 254         struct mwifiex_sta_node *node;
 255
 256         uap_rx_pd = (struct uap_rxpd *)(skb->data);
 257         rx_pkt_type = le16_to_cpu(uap_rx_pd->rx_pkt_type);
 258         rx_pkt_hdr = (void *)uap_rx_pd + le16_to_cpu(uap_rx_pd->rx_pkt_offset);
 259
 260         if ((le16_to_cpu(uap_rx_pd->rx_pkt_offset) +
 261              le16_to_cpu(uap_rx_pd->rx_pkt_length)) > (u16) skb->len) {
 262                 dev_err(adapter->dev,
 263                         "wrong rx packet: len=%d, offset=%d, length=%d\n",
 264                         skb->len, le16_to_cpu(uap_rx_pd->rx_pkt_offset),
 265                         le16_to_cpu(uap_rx_pd->rx_pkt_length));
 266                 priv->stats.rx_dropped++;
 267
 268                 if (adapter->if_ops.data_complete)
 269                         adapter->if_ops.data_complete(adapter, skb);
 270                 else
 271                         dev_kfree_skb_any(skb);
 272
 273                 return 0;
 274         }
 275
 276         if (le16_to_cpu(uap_rx_pd->rx_pkt_type) == PKT_TYPE_AMSDU) {
 277                 struct sk_buff_head list;
 278                 struct sk_buff *rx_skb;
 279
 280                 __skb_queue_head_init(&list);
 281                 skb_pull(skb, le16_to_cpu(uap_rx_pd->rx_pkt_offset));
 282                 skb_trim(skb, le16_to_cpu(uap_rx_pd->rx_pkt_length));
 283
 284                 ieee80211_amsdu_to_8023s(skb, &list, priv->curr_addr,
 285                                          priv->wdev->iftype, 0, false);
 286
 287                 while (!skb_queue_empty(&list)) {
 288                         rx_skb = __skb_dequeue(&list);
 289                         ret = mwifiex_recv_packet(priv, rx_skb);
 290                         if (ret)
 291                                 dev_err(adapter->dev,
 292                                         "AP:Rx A-MSDU failed");
 293                 }
 294
 295                 return 0;
 296         } else if (rx_pkt_type == PKT_TYPE_MGMT) {
 297                 ret = mwifiex_process_mgmt_packet(priv, skb);
 298                 if (ret)
 299                         dev_err(adapter->dev, "Rx of mgmt packet failed");
 300                 dev_kfree_skb_any(skb);
 301                 return ret;
 302         }
 303
 304         memcpy(ta, rx_pkt_hdr->eth803_hdr.h_source, ETH_ALEN);
 305
 306         if (rx_pkt_type != PKT_TYPE_BAR && uap_rx_pd->priority < MAX_NUM_TID) {
 307                 node = mwifiex_get_sta_entry(priv, ta);
 308                 if (node)
 309                         node->rx_seq[uap_rx_pd->priority] =
 310                                                 le16_to_cpu(uap_rx_pd->seq_num);
 311         }
 312
 313         if (!priv->ap_11n_enabled ||
 314             (!mwifiex_11n_get_rx_reorder_tbl(priv, uap_rx_pd->priority, ta) &&
 315             (le16_to_cpu(uap_rx_pd->rx_pkt_type) != PKT_TYPE_AMSDU))) {
 316                 ret = mwifiex_handle_uap_rx_forward(priv, skb);
 317                 return ret;
 318         }
 319
 320         /* Reorder and send to kernel */
 321         pkt_type = (u8)le16_to_cpu(uap_rx_pd->rx_pkt_type);
 322         ret = mwifiex_11n_rx_reorder_pkt(priv, le16_to_cpu(uap_rx_pd->seq_num),
 323                                          uap_rx_pd->priority, ta, pkt_type,
 324                                          skb);
 325
 326         if (ret || (rx_pkt_type == PKT_TYPE_BAR)) {
 327                 if (adapter->if_ops.data_complete)
 328                         adapter->if_ops.data_complete(adapter, skb);
 329                 else
 330                         dev_kfree_skb_any(skb);
 331         }
 332
 333         if (ret)
 334                 priv->stats.rx_dropped++;
 335
 336         return ret;
 337 }
 338
 339 /*
 340  * This function fills the TxPD for AP tx packets.
 341  *
 342  * The Tx buffer received by this function should already have the
 343  * header space allocated for TxPD.
 344  *
 345  * This function inserts the TxPD in between interface header and actual
 346  * data and adjusts the buffer pointers accordingly.
 347  *
 348  * The following TxPD fields are set by this function, as required -
 349  *      - BSS number
 350  *      - Tx packet length and offset
 351  *      - Priority
 352  *      - Packet delay
 353  *      - Priority specific Tx control
 354  *      - Flags
 355  */
 356 void *mwifiex_process_uap_txpd(struct mwifiex_private *priv,
 357                                struct sk_buff *skb)
 358 {
 359         struct mwifiex_adapter *adapter = priv->adapter;
 360         struct uap_txpd *txpd;
 361         struct mwifiex_txinfo *tx_info = MWIFIEX_SKB_TXCB(skb);
 362         int pad, len;
 363         u16 pkt_type;
 364
 365         if (!skb->len) {
 366                 dev_err(adapter->dev, "Tx: bad packet length: %d\n", skb->len);
 367                 tx_info->status_code = -1;
 368                 return skb->data;
 369         }
 370
 371         pkt_type = mwifiex_is_skb_mgmt_frame(skb) ? PKT_TYPE_MGMT : 0;
 372
 373         /* If skb->data is not aligned, add padding */
 374         pad = (4 - (((void *)skb->data - NULL) & 0x3)) % 4;
 375
 376         len = sizeof(*txpd) + pad;
 377
 378         BUG_ON(skb_headroom(skb) < len + INTF_HEADER_LEN);
 379
 380         skb_push(skb, len);
 381
 382         txpd = (struct uap_txpd *)skb->data;
 383         memset(txpd, 0, sizeof(*txpd));
 384         txpd->bss_num = priv->bss_num;
 385         txpd->bss_type = priv->bss_type;
 386         txpd->tx_pkt_length = cpu_to_le16((u16)(skb->len - len));
 387
 388         txpd->priority = (u8)skb->priority;
 389         txpd->pkt_delay_2ms = mwifiex_wmm_compute_drv_pkt_delay(priv, skb);
 390
 391         if (txpd->priority < ARRAY_SIZE(priv->wmm.user_pri_pkt_tx_ctrl))
 392                 /*
 393                  * Set the priority specific tx_control field, setting of 0 will
 394                  * cause the default value to be used later in this function.
 395                  */
 396                 txpd->tx_control =
 397                     cpu_to_le32(priv->wmm.user_pri_pkt_tx_ctrl[txpd->priority]);
 398
 399         /* Offset of actual data */
 400         if (pkt_type == PKT_TYPE_MGMT) {
 401                 /* Set the packet type and add header for management frame */
 402                 txpd->tx_pkt_type = cpu_to_le16(pkt_type);
 403                 len += MWIFIEX_MGMT_FRAME_HEADER_SIZE;
 404         }
 405
 406         txpd->tx_pkt_offset = cpu_to_le16(len);
 407
 408         /* make space for INTF_HEADER_LEN */
 409         skb_push(skb, INTF_HEADER_LEN);
 410
 411         if (!txpd->tx_control)
 412                 /* TxCtrl set by user or default */
 413                 txpd->tx_control = cpu_to_le32(priv->pkt_tx_ctrl);
 414
 415         return skb->data;
 416 }