drivers/net/wireless/mwifiex/uap_txrx.c

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