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_adapter *adapter,
  42                               struct sk_buff *skb)
  43 {
  44         int ret = 0;
  45         struct mwifiex_rxinfo *rx_info = MWIFIEX_SKB_RXCB(skb);
  46         struct mwifiex_private *priv = adapter->priv[rx_info->bss_index];
  47         struct rx_packet_hdr *rx_pkt_hdr;
  48         struct rxpd *local_rx_pd;
  49         int hdr_chop;
  50         struct ethhdr *eth_hdr;
  51         u8 rfc1042_eth_hdr[ETH_ALEN] = { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
  52
  53         local_rx_pd = (struct rxpd *) (skb->data);
  54
  55         rx_pkt_hdr = (struct rx_packet_hdr *) ((u8 *) local_rx_pd +
  56                                 local_rx_pd->rx_pkt_offset);
  57
  58         if (!memcmp(&rx_pkt_hdr->rfc1042_hdr,
  59                     rfc1042_eth_hdr, sizeof(rfc1042_eth_hdr))) {
  60                 /*
  61                  *  Replace the 803 header and rfc1042 header (llc/snap) with an
  62                  *    EthernetII header, keep the src/dst and snap_type
  63                  *    (ethertype).
  64                  *  The firmware only passes up SNAP frames converting
  65                  *    all RX Data from 802.11 to 802.2/LLC/SNAP frames.
  66                  *  To create the Ethernet II, just move the src, dst address
  67                  *    right before the snap_type.
  68                  */
  69                 eth_hdr = (struct ethhdr *)
  70                         ((u8 *) &rx_pkt_hdr->eth803_hdr
  71                          + sizeof(rx_pkt_hdr->eth803_hdr) +
  72                          sizeof(rx_pkt_hdr->rfc1042_hdr)
  73                          - sizeof(rx_pkt_hdr->eth803_hdr.h_dest)
  74                          - sizeof(rx_pkt_hdr->eth803_hdr.h_source)
  75                          - sizeof(rx_pkt_hdr->rfc1042_hdr.snap_type));
  76
  77                 memcpy(eth_hdr->h_source, rx_pkt_hdr->eth803_hdr.h_source,
  78                        sizeof(eth_hdr->h_source));
  79                 memcpy(eth_hdr->h_dest, rx_pkt_hdr->eth803_hdr.h_dest,
  80                        sizeof(eth_hdr->h_dest));
  81
  82                 /* Chop off the rxpd + the excess memory from the 802.2/llc/snap
  83                    header that was removed. */
  84                 hdr_chop = (u8 *) eth_hdr - (u8 *) local_rx_pd;
  85         } else {
  86                 /* Chop off the rxpd */
  87                 hdr_chop = (u8 *) &rx_pkt_hdr->eth803_hdr -
  88                         (u8 *) local_rx_pd;
  89         }
  90
  91         /* Chop off the leading header bytes so the it points to the start of
  92            either the reconstructed EthII frame or the 802.2/llc/snap frame */
  93         skb_pull(skb, hdr_chop);
  94
  95         priv->rxpd_rate = local_rx_pd->rx_rate;
  96
  97         priv->rxpd_htinfo = local_rx_pd->ht_info;
  98
  99         ret = mwifiex_recv_packet(adapter, skb);
 100         if (ret == -1)
 101                 dev_err(adapter->dev, "recv packet failed\n");
 102
 103         return ret;
 104 }
 105
 106 /*
 107  * This function processes the received buffer.
 108  *
 109  * The function looks into the RxPD and performs sanity tests on the
 110  * received buffer to ensure its a valid packet, before processing it
 111  * further. If the packet is determined to be aggregated, it is
 112  * de-aggregated accordingly. Non-unicast packets are sent directly to
 113  * the kernel/upper layers. Unicast packets are handed over to the
 114  * Rx reordering routine if 11n is enabled.
 115  *
 116  * The completion callback is called after processing in complete.
 117  */
 118 int mwifiex_process_sta_rx_packet(struct mwifiex_adapter *adapter,
 119                                   struct sk_buff *skb)
 120 {
 121         int ret = 0;
 122         struct rxpd *local_rx_pd;
 123         struct mwifiex_rxinfo *rx_info = MWIFIEX_SKB_RXCB(skb);
 124         struct rx_packet_hdr *rx_pkt_hdr;
 125         u8 ta[ETH_ALEN];
 126         u16 rx_pkt_type = 0;
 127         struct mwifiex_private *priv = adapter->priv[rx_info->bss_index];
 128
 129         local_rx_pd = (struct rxpd *) (skb->data);
 130         rx_pkt_type = local_rx_pd->rx_pkt_type;
 131
 132         rx_pkt_hdr = (struct rx_packet_hdr *) ((u8 *) local_rx_pd +
 133                                         local_rx_pd->rx_pkt_offset);
 134
 135         if ((local_rx_pd->rx_pkt_offset + local_rx_pd->rx_pkt_length) >
 136             (u16) skb->len) {
 137                 dev_err(adapter->dev, "wrong rx packet: len=%d,"
 138                         " rx_pkt_offset=%d, rx_pkt_length=%d\n", skb->len,
 139                        local_rx_pd->rx_pkt_offset, local_rx_pd->rx_pkt_length);
 140                 priv->stats.rx_dropped++;
 141                 dev_kfree_skb_any(skb);
 142                 return ret;
 143         }
 144         if (local_rx_pd->rx_pkt_type == PKT_TYPE_AMSDU) {
 145                 mwifiex_11n_deaggregate_pkt(priv, skb);
 146                 return ret;
 147         }
 148         /*
 149          * If the packet is not an unicast packet then send the packet
 150          * directly to os. Don't pass thru rx reordering
 151          */
 152         if (!IS_11N_ENABLED(priv) ||
 153             memcmp(priv->curr_addr, rx_pkt_hdr->eth803_hdr.h_dest, ETH_ALEN)) {
 154                 mwifiex_process_rx_packet(adapter, skb);
 155                 return ret;
 156         }
 157
 158         if (mwifiex_queuing_ra_based(priv)) {
 159                 memcpy(ta, rx_pkt_hdr->eth803_hdr.h_source, ETH_ALEN);
 160         } else {
 161                 if (rx_pkt_type != PKT_TYPE_BAR)
 162                         priv->rx_seq[local_rx_pd->priority] =
 163                                                 local_rx_pd->seq_num;
 164                 memcpy(ta, priv->curr_bss_params.bss_descriptor.mac_address,
 165                        ETH_ALEN);
 166         }
 167
 168         /* Reorder and send to OS */
 169         ret = mwifiex_11n_rx_reorder_pkt(priv, local_rx_pd->seq_num,
 170                                              local_rx_pd->priority, ta,
 171                                              (u8) local_rx_pd->rx_pkt_type,
 172                                                 (void *) skb);
 173
 174         if (ret || (rx_pkt_type == PKT_TYPE_BAR)) {
 175                 if (priv && (ret == -1))
 176                         priv->stats.rx_dropped++;
 177
 178                 dev_kfree_skb_any(skb);
 179         }
 180
 181         return ret;
 182 }