drivers/net/wireless/mwifiex/sta_rx.c

   1 /*
   2  * Marvell Wireless LAN device driver: station RX data handling
   3  *
   4  * Copyright (C) 2011, 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 "util.h"
  23 #include "fw.h"
  24 #include "main.h"
  25 #include "11n_aggr.h"
  26 #include "11n_rxreorder.h"
  27
  28 /*
  29  * This function processes the received packet and forwards it
  30  * to kernel/upper layer.
  31  *
  32  * This function parses through the received packet and determines
  33  * if it is a debug packet or normal packet.
  34  *
  35  * For non-debug packets, the function chops off unnecessary leading
  36  * header bytes, reconstructs the packet as an ethernet frame or
  37  * 802.2/llc/snap frame as required, and sends it to kernel/upper layer.
  38  *
  39  * The completion callback is called after processing in complete.
  40  */
  41 int mwifiex_process_rx_packet(struct mwifiex_private *priv,
  42                               struct sk_buff *skb)
  43 {
  44         int ret;
  45         struct rx_packet_hdr *rx_pkt_hdr;
  46         struct rxpd *local_rx_pd;
  47         int hdr_chop;
  48         struct ethhdr *eth_hdr;
  49         u8 rfc1042_eth_hdr[ETH_ALEN] = { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
  50
  51         local_rx_pd = (struct rxpd *) (skb->data);
  52
  53         rx_pkt_hdr = (void *)local_rx_pd +
  54                      le16_to_cpu(local_rx_pd->rx_pkt_offset);
  55
  56         if (!memcmp(&rx_pkt_hdr->rfc1042_hdr,
  57                     rfc1042_eth_hdr, sizeof(rfc1042_eth_hdr))) {
  58                 /*
  59                  *  Replace the 803 header and rfc1042 header (llc/snap) with an
  60                  *    EthernetII header, keep the src/dst and snap_type
  61                  *    (ethertype).
  62                  *  The firmware only passes up SNAP frames converting
  63                  *    all RX Data from 802.11 to 802.2/LLC/SNAP frames.
  64                  *  To create the Ethernet II, just move the src, dst address
  65                  *    right before the snap_type.
  66                  */
  67                 eth_hdr = (struct ethhdr *)
  68                         ((u8 *) &rx_pkt_hdr->eth803_hdr
  69                          + sizeof(rx_pkt_hdr->eth803_hdr) +
  70                          sizeof(rx_pkt_hdr->rfc1042_hdr)
  71                          - sizeof(rx_pkt_hdr->eth803_hdr.h_dest)
  72                          - sizeof(rx_pkt_hdr->eth803_hdr.h_source)
  73                          - sizeof(rx_pkt_hdr->rfc1042_hdr.snap_type));
  74
  75                 memcpy(eth_hdr->h_source, rx_pkt_hdr->eth803_hdr.h_source,
  76                        sizeof(eth_hdr->h_source));
  77                 memcpy(eth_hdr->h_dest, rx_pkt_hdr->eth803_hdr.h_dest,
  78                        sizeof(eth_hdr->h_dest));
  79
  80                 /* Chop off the rxpd + the excess memory from the 802.2/llc/snap
  81                    header that was removed. */
  82                 hdr_chop = (u8 *) eth_hdr - (u8 *) local_rx_pd;
  83         } else {
  84                 /* Chop off the rxpd */
  85                 hdr_chop = (u8 *) &rx_pkt_hdr->eth803_hdr -
  86                         (u8 *) local_rx_pd;
  87         }
  88
  89         /* Chop off the leading header bytes so the it points to the start of
  90            either the reconstructed EthII frame or the 802.2/llc/snap frame */
  91         skb_pull(skb, hdr_chop);
  92
  93         priv->rxpd_rate = local_rx_pd->rx_rate;
  94
  95         priv->rxpd_htinfo = local_rx_pd->ht_info;
  96
  97         ret = mwifiex_recv_packet(priv, skb);
  98         if (ret == -1)
  99                 dev_err(priv->adapter->dev, "recv packet failed\n");
 100
 101         return ret;
 102 }
 103
 104 /*
 105  * This function processes the received buffer.
 106  *
 107  * The function looks into the RxPD and performs sanity tests on the
 108  * received buffer to ensure its a valid packet, before processing it
 109  * further. If the packet is determined to be aggregated, it is
 110  * de-aggregated accordingly. Non-unicast packets are sent directly to
 111  * the kernel/upper layers. Unicast packets are handed over to the
 112  * Rx reordering routine if 11n is enabled.
 113  *
 114  * The completion callback is called after processing in complete.
 115  */
 116 int mwifiex_process_sta_rx_packet(struct mwifiex_private *priv,
 117                                   struct sk_buff *skb)
 118 {
 119         struct mwifiex_adapter *adapter = priv->adapter;
 120         int ret = 0;
 121         struct rxpd *local_rx_pd;
 122         struct rx_packet_hdr *rx_pkt_hdr;
 123         u8 ta[ETH_ALEN];
 124         u16 rx_pkt_type, rx_pkt_offset, rx_pkt_length, seq_num;
 125
 126         local_rx_pd = (struct rxpd *) (skb->data);
 127         rx_pkt_type = le16_to_cpu(local_rx_pd->rx_pkt_type);
 128         rx_pkt_offset = le16_to_cpu(local_rx_pd->rx_pkt_offset);
 129         rx_pkt_length = le16_to_cpu(local_rx_pd->rx_pkt_length);
 130         seq_num = le16_to_cpu(local_rx_pd->seq_num);
 131
 132         rx_pkt_hdr = (void *)local_rx_pd + rx_pkt_offset;
 133
 134         if ((rx_pkt_offset + rx_pkt_length) > (u16) skb->len) {
 135                 dev_err(adapter->dev,
 136                         "wrong rx packet: len=%d, rx_pkt_offset=%d, rx_pkt_length=%d\n",
 137                         skb->len, rx_pkt_offset, rx_pkt_length);
 138                 priv->stats.rx_dropped++;
 139
 140                 if (adapter->if_ops.data_complete)
 141                         adapter->if_ops.data_complete(adapter, skb);
 142                 else
 143                         dev_kfree_skb_any(skb);
 144
 145                 return ret;
 146         }
 147
 148         if (rx_pkt_type == PKT_TYPE_AMSDU) {
 149                 struct sk_buff_head list;
 150                 struct sk_buff *rx_skb;
 151
 152                 __skb_queue_head_init(&list);
 153
 154                 skb_pull(skb, rx_pkt_offset);
 155                 skb_trim(skb, rx_pkt_length);
 156
 157                 ieee80211_amsdu_to_8023s(skb, &list, priv->curr_addr,
 158                                          priv->wdev->iftype, 0, false);
 159
 160                 while (!skb_queue_empty(&list)) {
 161                         rx_skb = __skb_dequeue(&list);
 162                         ret = mwifiex_recv_packet(priv, rx_skb);
 163                         if (ret == -1)
 164                                 dev_err(adapter->dev, "Rx of A-MSDU failed");
 165                 }
 166                 return 0;
 167         } else if (rx_pkt_type == PKT_TYPE_MGMT) {
 168                 ret = mwifiex_process_mgmt_packet(priv, skb);
 169                 if (ret)
 170                         dev_err(adapter->dev, "Rx of mgmt packet failed");
 171                 dev_kfree_skb_any(skb);
 172                 return ret;
 173         }
 174
 175         /*
 176          * If the packet is not an unicast packet then send the packet
 177          * directly to os. Don't pass thru rx reordering
 178          */
 179         if (!IS_11N_ENABLED(priv) ||
 180             memcmp(priv->curr_addr, rx_pkt_hdr->eth803_hdr.h_dest, ETH_ALEN)) {
 181                 mwifiex_process_rx_packet(priv, skb);
 182                 return ret;
 183         }
 184
 185         if (mwifiex_queuing_ra_based(priv)) {
 186                 memcpy(ta, rx_pkt_hdr->eth803_hdr.h_source, ETH_ALEN);
 187         } else {
 188                 if (rx_pkt_type != PKT_TYPE_BAR)
 189                         priv->rx_seq[local_rx_pd->priority] = seq_num;
 190                 memcpy(ta, priv->curr_bss_params.bss_descriptor.mac_address,
 191                        ETH_ALEN);
 192         }
 193
 194         /* Reorder and send to OS */
 195         ret = mwifiex_11n_rx_reorder_pkt(priv, seq_num, local_rx_pd->priority,
 196                                          ta, (u8) rx_pkt_type, skb);
 197
 198         if (ret || (rx_pkt_type == PKT_TYPE_BAR)) {
 199                 if (adapter->if_ops.data_complete)
 200                         adapter->if_ops.data_complete(adapter, skb);
 201                 else
 202                         dev_kfree_skb_any(skb);
 203         }
 204
 205         if (ret)
 206                 priv->stats.rx_dropped++;
 207
 208         return ret;
 209 }