drivers/staging/vt6656/dpc.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (c) 1996, 2003 VIA Networking Technologies, Inc.
   4  * All rights reserved.
   5  *
   6  * File: dpc.c
   7  *
   8  * Purpose: handle dpc rx functions
   9  *
  10  * Author: Lyndon Chen
  11  *
  12  * Date: May 20, 2003
  13  *
  14  * Functions:
  15  *
  16  * Revision History:
  17  *
  18  */
  19
  20 #include "dpc.h"
  21 #include "device.h"
  22 #include "mac.h"
  23 #include "baseband.h"
  24 #include "rf.h"
  25
  26 int vnt_rx_data(struct vnt_private *priv, struct vnt_rcb *ptr_rcb,
  27                 unsigned long bytes_received)
  28 {
  29         struct ieee80211_hw *hw = priv->hw;
  30         struct ieee80211_supported_band *sband;
  31         struct sk_buff *skb;
  32         struct ieee80211_rx_status rx_status = { 0 };
  33         struct ieee80211_hdr *hdr;
  34         __le16 fc;
  35         u8 *rsr, *new_rsr, *rssi;
  36         __le64 *tsf_time;
  37         u32 frame_size;
  38         int ii, r;
  39         u8 *rx_rate, *sq, *sq_3;
  40         u32 wbk_status;
  41         u8 *skb_data;
  42         u16 *pay_load_len;
  43         u16 pay_load_with_padding;
  44         u8 rate_idx = 0;
  45         u8 rate[MAX_RATE] = {2, 4, 11, 22, 12, 18, 24, 36, 48, 72, 96, 108};
  46         long rx_dbm;
  47
  48         skb = ptr_rcb->skb;
  49
  50         /* [31:16]RcvByteCount ( not include 4-byte Status ) */
  51         wbk_status = *((u32 *)(skb->data));
  52         frame_size = wbk_status >> 16;
  53         frame_size += 4;
  54
  55         if (bytes_received != frame_size) {
  56                 dev_dbg(&priv->usb->dev, "------- WRONG Length 1\n");
  57                 return false;
  58         }
  59
  60         if ((bytes_received > 2372) || (bytes_received <= 40)) {
  61                 /* Frame Size error drop this packet.*/
  62                 dev_dbg(&priv->usb->dev, "------ WRONG Length 2\n");
  63                 return false;
  64         }
  65
  66         skb_data = (u8 *)skb->data;
  67
  68         rx_rate = skb_data + 5;
  69
  70         /* real Frame Size = USBframe_size -4WbkStatus - 4RxStatus */
  71         /* -8TSF - 4RSR - 4SQ3 - ?Padding */
  72
  73         /* if SQ3 the range is 24~27, if no SQ3 the range is 20~23 */
  74
  75         pay_load_len = (u16 *)(skb_data + 6);
  76
  77         /*Fix hardware bug => PLCP_Length error */
  78         if (((bytes_received - (*pay_load_len)) > 27) ||
  79             ((bytes_received - (*pay_load_len)) < 24) ||
  80             (bytes_received < (*pay_load_len))) {
  81                 dev_dbg(&priv->usb->dev, "Wrong PLCP Length %x\n",
  82                         *pay_load_len);
  83                 return false;
  84         }
  85
  86         sband = hw->wiphy->bands[hw->conf.chandef.chan->band];
  87
  88         for (r = RATE_1M; r < MAX_RATE; r++) {
  89                 if (*rx_rate == rate[r])
  90                         break;
  91         }
  92
  93         priv->rx_rate = r;
  94
  95         for (ii = 0; ii < sband->n_bitrates; ii++) {
  96                 if (sband->bitrates[ii].hw_value == r) {
  97                         rate_idx = ii;
  98                                 break;
  99                 }
 100         }
 101
 102         if (ii == sband->n_bitrates) {
 103                 dev_dbg(&priv->usb->dev, "Wrong RxRate %x\n", *rx_rate);
 104                 return false;
 105         }
 106
 107         pay_load_with_padding = ((*pay_load_len / 4) +
 108                 ((*pay_load_len % 4) ? 1 : 0)) * 4;
 109
 110         tsf_time = (__le64 *)(skb_data + 8 + pay_load_with_padding);
 111
 112         priv->tsf_time = le64_to_cpu(*tsf_time);
 113
 114         if (priv->bb_type == BB_TYPE_11G) {
 115                 sq_3 = skb_data + 8 + pay_load_with_padding + 12;
 116                 sq = sq_3;
 117         } else {
 118                 sq = skb_data + 8 + pay_load_with_padding + 8;
 119                 sq_3 = sq;
 120         }
 121
 122         new_rsr = skb_data + 8 + pay_load_with_padding + 9;
 123         rssi = skb_data + 8 + pay_load_with_padding + 10;
 124
 125         rsr = skb_data + 8 + pay_load_with_padding + 11;
 126         if (*rsr & (RSR_IVLDTYP | RSR_IVLDLEN))
 127                 return false;
 128
 129         frame_size = *pay_load_len;
 130
 131         vnt_rf_rssi_to_dbm(priv, *rssi, &rx_dbm);
 132
 133         priv->bb_pre_ed_rssi = (u8)rx_dbm + 1;
 134         priv->current_rssi = priv->bb_pre_ed_rssi;
 135
 136         skb_pull(skb, 8);
 137         skb_trim(skb, frame_size);
 138
 139         rx_status.mactime = priv->tsf_time;
 140         rx_status.band = hw->conf.chandef.chan->band;
 141         rx_status.signal = rx_dbm;
 142         rx_status.flag = 0;
 143         rx_status.freq = hw->conf.chandef.chan->center_freq;
 144
 145         if (!(*rsr & RSR_CRCOK))
 146                 rx_status.flag |= RX_FLAG_FAILED_FCS_CRC;
 147
 148         hdr = (struct ieee80211_hdr *)(skb->data);
 149         fc = hdr->frame_control;
 150
 151         rx_status.rate_idx = rate_idx;
 152
 153         if (ieee80211_has_protected(fc)) {
 154                 if (priv->local_id > REV_ID_VT3253_A1) {
 155                         rx_status.flag |= RX_FLAG_DECRYPTED;
 156
 157                         /* Drop packet */
 158                         if (!(*new_rsr & NEWRSR_DECRYPTOK)) {
 159                                 dev_kfree_skb(skb);
 160                                 return true;
 161                         }
 162                 }
 163         }
 164
 165         memcpy(IEEE80211_SKB_RXCB(skb), &rx_status, sizeof(rx_status));
 166
 167         ieee80211_rx_irqsafe(priv->hw, skb);
 168
 169         return true;
 170 }