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