drivers/staging/vt6655/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 "device.h"
  21 #include "baseband.h"
  22 #include "rf.h"
  23 #include "dpc.h"
  24
  25 static bool vnt_rx_data(struct vnt_private *priv, struct sk_buff *skb,
  26                         u16 bytes_received)
  27 {
  28         struct ieee80211_hw *hw = priv->hw;
  29         struct ieee80211_supported_band *sband;
  30         struct ieee80211_rx_status rx_status = { 0 };
  31         struct ieee80211_hdr *hdr;
  32         __le16 fc;
  33         u8 *rsr, *new_rsr, *rssi;
  34         __le64 *tsf_time;
  35         u16 frame_size;
  36         int ii, r;
  37         u8 *rx_sts, *rx_rate, *sq;
  38         u8 *skb_data;
  39         u8 rate_idx = 0;
  40         u8 rate[MAX_RATE] = {2, 4, 11, 22, 12, 18, 24, 36, 48, 72, 96, 108};
  41         long rx_dbm;
  42
  43         /* [31:16]RcvByteCount ( not include 4-byte Status ) */
  44         frame_size = le16_to_cpu(*((__le16 *)(skb->data + 2)));
  45         if (frame_size > 2346 || frame_size < 14) {
  46                 dev_dbg(&priv->pcid->dev, "------- WRONG Length 1\n");
  47                 return false;
  48         }
  49
  50         skb_data = (u8 *)skb->data;
  51
  52         rx_sts = skb_data;
  53         rx_rate = skb_data + 1;
  54
  55         sband = hw->wiphy->bands[hw->conf.chandef.chan->band];
  56
  57         for (r = RATE_1M; r < MAX_RATE; r++) {
  58                 if (*rx_rate == rate[r])
  59                         break;
  60         }
  61
  62         priv->rx_rate = r;
  63
  64         for (ii = 0; ii < sband->n_bitrates; ii++) {
  65                 if (sband->bitrates[ii].hw_value == r) {
  66                         rate_idx = ii;
  67                                 break;
  68                 }
  69         }
  70
  71         if (ii == sband->n_bitrates) {
  72                 dev_dbg(&priv->pcid->dev, "Wrong RxRate %x\n", *rx_rate);
  73                 return false;
  74         }
  75
  76         tsf_time = (__le64 *)(skb_data + bytes_received - 12);
  77         sq = skb_data + bytes_received - 4;
  78         new_rsr = skb_data + bytes_received - 3;
  79         rssi = skb_data + bytes_received - 2;
  80         rsr = skb_data + bytes_received - 1;
  81         if (*rsr & (RSR_IVLDTYP | RSR_IVLDLEN))
  82                 return false;
  83
  84         RFvRSSITodBm(priv, *rssi, &rx_dbm);
  85
  86         priv->byBBPreEDRSSI = (u8)rx_dbm + 1;
  87         priv->uCurrRSSI = *rssi;
  88
  89         skb_pull(skb, 4);
  90         skb_trim(skb, frame_size);
  91
  92         rx_status.mactime = le64_to_cpu(*tsf_time);
  93         rx_status.band = hw->conf.chandef.chan->band;
  94         rx_status.signal = rx_dbm;
  95         rx_status.flag = 0;
  96         rx_status.freq = hw->conf.chandef.chan->center_freq;
  97
  98         if (!(*rsr & RSR_CRCOK))
  99                 rx_status.flag |= RX_FLAG_FAILED_FCS_CRC;
 100
 101         hdr = (struct ieee80211_hdr *)(skb->data);
 102         fc = hdr->frame_control;
 103
 104         rx_status.rate_idx = rate_idx;
 105
 106         if (ieee80211_has_protected(fc)) {
 107                 if (priv->byLocalID > REV_ID_VT3253_A1)
 108                         rx_status.flag |= RX_FLAG_DECRYPTED;
 109
 110                 /* Drop packet */
 111                 if (!(*new_rsr & NEWRSR_DECRYPTOK))
 112                         return false;
 113         }
 114
 115         memcpy(IEEE80211_SKB_RXCB(skb), &rx_status, sizeof(rx_status));
 116
 117         ieee80211_rx_irqsafe(priv->hw, skb);
 118
 119         return true;
 120 }
 121
 122 bool vnt_receive_frame(struct vnt_private *priv, struct vnt_rx_desc *curr_rd)
 123 {
 124         struct vnt_rd_info *rd_info = curr_rd->rd_info;
 125         struct sk_buff *skb;
 126         u16 frame_size;
 127
 128         skb = rd_info->skb;
 129
 130         dma_unmap_single(&priv->pcid->dev, rd_info->skb_dma,
 131                          priv->rx_buf_sz, DMA_FROM_DEVICE);
 132
 133         frame_size = le16_to_cpu(curr_rd->rd1.req_count)
 134                         - le16_to_cpu(curr_rd->rd0.res_count);
 135
 136         if ((frame_size > 2364) || (frame_size < 33)) {
 137                 /* Frame Size error drop this packet.*/
 138                 dev_dbg(&priv->pcid->dev, "Wrong frame size %d\n", frame_size);
 139                 dev_kfree_skb_irq(skb);
 140                 return true;
 141         }
 142
 143         if (vnt_rx_data(priv, skb, frame_size))
 144                 return true;
 145
 146         dev_kfree_skb_irq(skb);
 147
 148         return true;
 149 }