drivers/net/wireless/marvell/mwifiex/uap_txrx.c

   1 /*
   2  * Marvell Wireless LAN device driver: AP TX and RX data handling
   3  *
   4  * Copyright (C) 2012-2014, 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 "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                                   int tid)
  36 {
  37         struct mwifiex_ra_list_tbl *ra_list;
  38         struct sk_buff *skb, *tmp;
  39         bool pkt_deleted = false;
  40         struct mwifiex_txinfo *tx_info;
  41         struct mwifiex_adapter *adapter = priv->adapter;
  42
  43         list_for_each_entry(ra_list, ra_list_head, list) {
  44                 if (skb_queue_empty(&ra_list->skb_head))
  45                         continue;
  46
  47                 skb_queue_walk_safe(&ra_list->skb_head, skb, tmp) {
  48                         tx_info = MWIFIEX_SKB_TXCB(skb);
  49                         if (tx_info->flags & MWIFIEX_BUF_FLAG_BRIDGED_PKT) {
  50                                 __skb_unlink(skb, &ra_list->skb_head);
  51                                 mwifiex_write_data_complete(adapter, skb, 0,
  52                                                             -1);
  53                                 if (ra_list->tx_paused)
  54                                         priv->wmm.pkts_paused[tid]--;
  55                                 else
  56                                         atomic_dec(&priv->wmm.tx_pkts_queued);
  57                                 pkt_deleted = true;
  58                         }
  59                         if ((atomic_read(&adapter->pending_bridged_pkts) <=
  60                                              MWIFIEX_BRIDGED_PKTS_THR_LOW))
  61                                 break;
  62                 }
  63         }
  64
  65         return pkt_deleted;
  66 }
  67
  68 /* This function deletes packets from particular RA List. RA list index
  69  * from which packets are deleted is preserved so that packets from next RA
  70  * list are deleted upon subsequent call thus maintaining fairness.
  71  */
  72 static void mwifiex_uap_cleanup_tx_queues(struct mwifiex_private *priv)
  73 {
  74         unsigned long flags;
  75         struct list_head *ra_list;
  76         int i;
  77
  78         spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags);
  79
  80         for (i = 0; i < MAX_NUM_TID; i++, priv->del_list_idx++) {
  81                 if (priv->del_list_idx == MAX_NUM_TID)
  82                         priv->del_list_idx = 0;
  83                 ra_list = &priv->wmm.tid_tbl_ptr[priv->del_list_idx].ra_list;
  84                 if (mwifiex_uap_del_tx_pkts_in_ralist(priv, ra_list, i)) {
  85                         priv->del_list_idx++;
  86                         break;
  87                 }
  88         }
  89
  90         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
  91 }
  92
  93
  94 static void mwifiex_uap_queue_bridged_pkt(struct mwifiex_private *priv,
  95                                          struct sk_buff *skb)
  96 {
  97         struct mwifiex_adapter *adapter = priv->adapter;
  98         struct uap_rxpd *uap_rx_pd;
  99         struct rx_packet_hdr *rx_pkt_hdr;
 100         struct sk_buff *new_skb;
 101         struct mwifiex_txinfo *tx_info;
 102         int hdr_chop;
 103         struct ethhdr *p_ethhdr;
 104         struct mwifiex_sta_node *src_node;
 105
 106         uap_rx_pd = (struct uap_rxpd *)(skb->data);
 107         rx_pkt_hdr = (void *)uap_rx_pd + le16_to_cpu(uap_rx_pd->rx_pkt_offset);
 108
 109         if ((atomic_read(&adapter->pending_bridged_pkts) >=
 110                                              MWIFIEX_BRIDGED_PKTS_THR_HIGH)) {
 111                 mwifiex_dbg(priv->adapter, ERROR,
 112                             "Tx: Bridge packet limit reached. Drop packet!\n");
 113                 kfree_skb(skb);
 114                 mwifiex_uap_cleanup_tx_queues(priv);
 115                 return;
 116         }
 117
 118         if ((!memcmp(&rx_pkt_hdr->rfc1042_hdr, bridge_tunnel_header,
 119                      sizeof(bridge_tunnel_header))) ||
 120             (!memcmp(&rx_pkt_hdr->rfc1042_hdr, rfc1042_header,
 121                      sizeof(rfc1042_header)) &&
 122              ntohs(rx_pkt_hdr->rfc1042_hdr.snap_type) != ETH_P_AARP &&
 123              ntohs(rx_pkt_hdr->rfc1042_hdr.snap_type) != ETH_P_IPX)) {
 124                 /* Replace the 803 header and rfc1042 header (llc/snap) with
 125                  * an Ethernet II header, keep the src/dst and snap_type
 126                  * (ethertype).
 127                  *
 128                  * The firmware only passes up SNAP frames converting all RX
 129                  * data from 802.11 to 802.2/LLC/SNAP frames.
 130                  *
 131                  * To create the Ethernet II, just move the src, dst address
 132                  * right before the snap_type.
 133                  */
 134                 p_ethhdr = (struct ethhdr *)
 135                         ((u8 *)(&rx_pkt_hdr->eth803_hdr)
 136                          + sizeof(rx_pkt_hdr->eth803_hdr)
 137                          + sizeof(rx_pkt_hdr->rfc1042_hdr)
 138                          - sizeof(rx_pkt_hdr->eth803_hdr.h_dest)
 139                          - sizeof(rx_pkt_hdr->eth803_hdr.h_source)
 140                          - sizeof(rx_pkt_hdr->rfc1042_hdr.snap_type));
 141                 memcpy(p_ethhdr->h_source, rx_pkt_hdr->eth803_hdr.h_source,
 142                        sizeof(p_ethhdr->h_source));
 143                 memcpy(p_ethhdr->h_dest, rx_pkt_hdr->eth803_hdr.h_dest,
 144                        sizeof(p_ethhdr->h_dest));
 145                 /* Chop off the rxpd + the excess memory from
 146                  * 802.2/llc/snap header that was removed.
 147                  */
 148                 hdr_chop = (u8 *)p_ethhdr - (u8 *)uap_rx_pd;
 149         } else {
 150                 /* Chop off the rxpd */
 151                 hdr_chop = (u8 *)&rx_pkt_hdr->eth803_hdr - (u8 *)uap_rx_pd;
 152         }
 153
 154         /* Chop off the leading header bytes so that it points
 155          * to the start of either the reconstructed EthII frame
 156          * or the 802.2/llc/snap frame.
 157          */
 158         skb_pull(skb, hdr_chop);
 159
 160         if (skb_headroom(skb) < MWIFIEX_MIN_DATA_HEADER_LEN) {
 161                 mwifiex_dbg(priv->adapter, ERROR,
 162                             "data: Tx: insufficient skb headroom %d\n",
 163                             skb_headroom(skb));
 164                 /* Insufficient skb headroom - allocate a new skb */
 165                 new_skb =
 166                         skb_realloc_headroom(skb, MWIFIEX_MIN_DATA_HEADER_LEN);
 167                 if (unlikely(!new_skb)) {
 168                         mwifiex_dbg(priv->adapter, ERROR,
 169                                     "Tx: cannot allocate new_skb\n");
 170                         kfree_skb(skb);
 171                         priv->stats.tx_dropped++;
 172                         return;
 173                 }
 174
 175                 kfree_skb(skb);
 176                 skb = new_skb;
 177                 mwifiex_dbg(priv->adapter, INFO,
 178                             "info: new skb headroom %d\n",
 179                             skb_headroom(skb));
 180         }
 181
 182         tx_info = MWIFIEX_SKB_TXCB(skb);
 183         memset(tx_info, 0, sizeof(*tx_info));
 184         tx_info->bss_num = priv->bss_num;
 185         tx_info->bss_type = priv->bss_type;
 186         tx_info->flags |= MWIFIEX_BUF_FLAG_BRIDGED_PKT;
 187
 188         src_node = mwifiex_get_sta_entry(priv, rx_pkt_hdr->eth803_hdr.h_source);
 189         if (src_node) {
 190                 src_node->stats.last_rx = jiffies;
 191                 src_node->stats.rx_bytes += skb->len;
 192                 src_node->stats.rx_packets++;
 193                 src_node->stats.last_tx_rate = uap_rx_pd->rx_rate;
 194                 src_node->stats.last_tx_htinfo = uap_rx_pd->ht_info;
 195         }
 196
 197         if (is_unicast_ether_addr(rx_pkt_hdr->eth803_hdr.h_dest)) {
 198                 /* Update bridge packet statistics as the
 199                  * packet is not going to kernel/upper layer.
 200                  */
 201                 priv->stats.rx_bytes += skb->len;
 202                 priv->stats.rx_packets++;
 203
 204                 /* Sending bridge packet to TX queue, so save the packet
 205                  * length in TXCB to update statistics in TX complete.
 206                  */
 207                 tx_info->pkt_len = skb->len;
 208         }
 209
 210         __net_timestamp(skb);
 211         mwifiex_wmm_add_buf_txqueue(priv, skb);
 212         atomic_inc(&adapter->tx_pending);
 213         atomic_inc(&adapter->pending_bridged_pkts);
 214
 215         return;
 216 }
 217
 218 /*
 219  * This function contains logic for AP packet forwarding.
 220  *
 221  * If a packet is multicast/broadcast, it is sent to kernel/upper layer
 222  * as well as queued back to AP TX queue so that it can be sent to other
 223  * associated stations.
 224  * If a packet is unicast and RA is present in associated station list,
 225  * it is again requeued into AP TX queue.
 226  * If a packet is unicast and RA is not in associated station list,
 227  * packet is forwarded to kernel to handle routing logic.
 228  */
 229 int mwifiex_handle_uap_rx_forward(struct mwifiex_private *priv,
 230                                   struct sk_buff *skb)
 231 {
 232         struct mwifiex_adapter *adapter = priv->adapter;
 233         struct uap_rxpd *uap_rx_pd;
 234         struct rx_packet_hdr *rx_pkt_hdr;
 235         u8 ra[ETH_ALEN];
 236         struct sk_buff *skb_uap;
 237
 238         uap_rx_pd = (struct uap_rxpd *)(skb->data);
 239         rx_pkt_hdr = (void *)uap_rx_pd + le16_to_cpu(uap_rx_pd->rx_pkt_offset);
 240
 241         /* don't do packet forwarding in disconnected state */
 242         if (!priv->media_connected) {
 243                 mwifiex_dbg(adapter, ERROR,
 244                             "drop packet in disconnected state.\n");
 245                 dev_kfree_skb_any(skb);
 246                 return 0;
 247         }
 248
 249         memcpy(ra, rx_pkt_hdr->eth803_hdr.h_dest, ETH_ALEN);
 250
 251         if (is_multicast_ether_addr(ra)) {
 252                 skb_uap = skb_copy(skb, GFP_ATOMIC);
 253                 mwifiex_uap_queue_bridged_pkt(priv, skb_uap);
 254         } else {
 255                 if (mwifiex_get_sta_entry(priv, ra)) {
 256                         /* Requeue Intra-BSS packet */
 257                         mwifiex_uap_queue_bridged_pkt(priv, skb);
 258                         return 0;
 259                 }
 260         }
 261
 262         /* Forward unicat/Inter-BSS packets to kernel. */
 263         return mwifiex_process_rx_packet(priv, skb);
 264 }
 265
 266 /*
 267  * This function processes the packet received on AP interface.
 268  *
 269  * The function looks into the RxPD and performs sanity tests on the
 270  * received buffer to ensure its a valid packet before processing it
 271  * further. If the packet is determined to be aggregated, it is
 272  * de-aggregated accordingly. Then skb is passed to AP packet forwarding logic.
 273  *
 274  * The completion callback is called after processing is complete.
 275  */
 276 int mwifiex_process_uap_rx_packet(struct mwifiex_private *priv,
 277                                   struct sk_buff *skb)
 278 {
 279         struct mwifiex_adapter *adapter = priv->adapter;
 280         int ret;
 281         struct uap_rxpd *uap_rx_pd;
 282         struct rx_packet_hdr *rx_pkt_hdr;
 283         u16 rx_pkt_type;
 284         u8 ta[ETH_ALEN], pkt_type;
 285         unsigned long flags;
 286         struct mwifiex_sta_node *node;
 287
 288         uap_rx_pd = (struct uap_rxpd *)(skb->data);
 289         rx_pkt_type = le16_to_cpu(uap_rx_pd->rx_pkt_type);
 290         rx_pkt_hdr = (void *)uap_rx_pd + le16_to_cpu(uap_rx_pd->rx_pkt_offset);
 291
 292         ether_addr_copy(ta, rx_pkt_hdr->eth803_hdr.h_source);
 293
 294         if ((le16_to_cpu(uap_rx_pd->rx_pkt_offset) +
 295              le16_to_cpu(uap_rx_pd->rx_pkt_length)) > (u16) skb->len) {
 296                 mwifiex_dbg(adapter, ERROR,
 297                             "wrong rx packet: len=%d, offset=%d, length=%d\n",
 298                             skb->len, le16_to_cpu(uap_rx_pd->rx_pkt_offset),
 299                             le16_to_cpu(uap_rx_pd->rx_pkt_length));
 300                 priv->stats.rx_dropped++;
 301
 302                 node = mwifiex_get_sta_entry(priv, ta);
 303                 if (node)
 304                         node->stats.tx_failed++;
 305
 306                 dev_kfree_skb_any(skb);
 307                 return 0;
 308         }
 309
 310         if (rx_pkt_type == PKT_TYPE_MGMT) {
 311                 ret = mwifiex_process_mgmt_packet(priv, skb);
 312                 if (ret)
 313                         mwifiex_dbg(adapter, DATA, "Rx of mgmt packet failed");
 314                 dev_kfree_skb_any(skb);
 315                 return ret;
 316         }
 317
 318
 319         if (rx_pkt_type != PKT_TYPE_BAR && uap_rx_pd->priority < MAX_NUM_TID) {
 320                 spin_lock_irqsave(&priv->sta_list_spinlock, flags);
 321                 node = mwifiex_get_sta_entry(priv, ta);
 322                 if (node)
 323                         node->rx_seq[uap_rx_pd->priority] =
 324                                                 le16_to_cpu(uap_rx_pd->seq_num);
 325                 spin_unlock_irqrestore(&priv->sta_list_spinlock, flags);
 326         }
 327
 328         if (!priv->ap_11n_enabled ||
 329             (!mwifiex_11n_get_rx_reorder_tbl(priv, uap_rx_pd->priority, ta) &&
 330             (le16_to_cpu(uap_rx_pd->rx_pkt_type) != PKT_TYPE_AMSDU))) {
 331                 ret = mwifiex_handle_uap_rx_forward(priv, skb);
 332                 return ret;
 333         }
 334
 335         /* Reorder and send to kernel */
 336         pkt_type = (u8)le16_to_cpu(uap_rx_pd->rx_pkt_type);
 337         ret = mwifiex_11n_rx_reorder_pkt(priv, le16_to_cpu(uap_rx_pd->seq_num),
 338                                          uap_rx_pd->priority, ta, pkt_type,
 339                                          skb);
 340
 341         if (ret || (rx_pkt_type == PKT_TYPE_BAR))
 342                 dev_kfree_skb_any(skb);
 343
 344         if (ret)
 345                 priv->stats.rx_dropped++;
 346
 347         return ret;
 348 }
 349
 350 /*
 351  * This function fills the TxPD for AP tx packets.
 352  *
 353  * The Tx buffer received by this function should already have the
 354  * header space allocated for TxPD.
 355  *
 356  * This function inserts the TxPD in between interface header and actual
 357  * data and adjusts the buffer pointers accordingly.
 358  *
 359  * The following TxPD fields are set by this function, as required -
 360  *      - BSS number
 361  *      - Tx packet length and offset
 362  *      - Priority
 363  *      - Packet delay
 364  *      - Priority specific Tx control
 365  *      - Flags
 366  */
 367 void *mwifiex_process_uap_txpd(struct mwifiex_private *priv,
 368                                struct sk_buff *skb)
 369 {
 370         struct mwifiex_adapter *adapter = priv->adapter;
 371         struct uap_txpd *txpd;
 372         struct mwifiex_txinfo *tx_info = MWIFIEX_SKB_TXCB(skb);
 373         int pad;
 374         u16 pkt_type, pkt_offset;
 375         int hroom = (priv->adapter->iface_type == MWIFIEX_USB) ? 0 :
 376                        INTF_HEADER_LEN;
 377
 378         if (!skb->len) {
 379                 mwifiex_dbg(adapter, ERROR,
 380                             "Tx: bad packet length: %d\n", skb->len);
 381                 tx_info->status_code = -1;
 382                 return skb->data;
 383         }
 384
 385         BUG_ON(skb_headroom(skb) < MWIFIEX_MIN_DATA_HEADER_LEN);
 386
 387         pkt_type = mwifiex_is_skb_mgmt_frame(skb) ? PKT_TYPE_MGMT : 0;
 388
 389         pad = ((void *)skb->data - (sizeof(*txpd) + hroom) - NULL) &
 390                         (MWIFIEX_DMA_ALIGN_SZ - 1);
 391
 392         skb_push(skb, sizeof(*txpd) + pad);
 393
 394         txpd = (struct uap_txpd *)skb->data;
 395         memset(txpd, 0, sizeof(*txpd));
 396         txpd->bss_num = priv->bss_num;
 397         txpd->bss_type = priv->bss_type;
 398         txpd->tx_pkt_length = cpu_to_le16((u16)(skb->len - (sizeof(*txpd) +
 399                                                 pad)));
 400         txpd->priority = (u8)skb->priority;
 401
 402         txpd->pkt_delay_2ms = mwifiex_wmm_compute_drv_pkt_delay(priv, skb);
 403
 404         if (tx_info->flags & MWIFIEX_BUF_FLAG_EAPOL_TX_STATUS ||
 405             tx_info->flags & MWIFIEX_BUF_FLAG_ACTION_TX_STATUS) {
 406                 txpd->tx_token_id = tx_info->ack_frame_id;
 407                 txpd->flags |= MWIFIEX_TXPD_FLAGS_REQ_TX_STATUS;
 408         }
 409
 410         if (txpd->priority < ARRAY_SIZE(priv->wmm.user_pri_pkt_tx_ctrl))
 411                 /*
 412                  * Set the priority specific tx_control field, setting of 0 will
 413                  * cause the default value to be used later in this function.
 414                  */
 415                 txpd->tx_control =
 416                     cpu_to_le32(priv->wmm.user_pri_pkt_tx_ctrl[txpd->priority]);
 417
 418         /* Offset of actual data */
 419         pkt_offset = sizeof(*txpd) + pad;
 420         if (pkt_type == PKT_TYPE_MGMT) {
 421                 /* Set the packet type and add header for management frame */
 422                 txpd->tx_pkt_type = cpu_to_le16(pkt_type);
 423                 pkt_offset += MWIFIEX_MGMT_FRAME_HEADER_SIZE;
 424         }
 425
 426         txpd->tx_pkt_offset = cpu_to_le16(pkt_offset);
 427
 428         /* make space for INTF_HEADER_LEN */
 429         skb_push(skb, hroom);
 430
 431         if (!txpd->tx_control)
 432                 /* TxCtrl set by user or default */
 433                 txpd->tx_control = cpu_to_le32(priv->pkt_tx_ctrl);
 434
 435         return skb->data;
 436 }