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_rate;
  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_rate = skb_data + 1;
  53
  54         sband = hw->wiphy->bands[hw->conf.chandef.chan->band];
  55
  56         for (r = RATE_1M; r < MAX_RATE; r++) {
  57                 if (*rx_rate == rate[r])
  58                         break;
  59         }
  60
  61         priv->rx_rate = r;
  62
  63         for (ii = 0; ii < sband->n_bitrates; ii++) {
  64                 if (sband->bitrates[ii].hw_value == r) {
  65                         rate_idx = ii;
  66                                 break;
  67                 }
  68         }
  69
  70         if (ii == sband->n_bitrates) {
  71                 dev_dbg(&priv->pcid->dev, "Wrong RxRate %x\n", *rx_rate);
  72                 return false;
  73         }
  74
  75         tsf_time = (__le64 *)(skb_data + bytes_received - 12);
  76         new_rsr = skb_data + bytes_received - 3;
  77         rssi = skb_data + bytes_received - 2;
  78         rsr = skb_data + bytes_received - 1;
  79         if (*rsr & (RSR_IVLDTYP | RSR_IVLDLEN))
  80                 return false;
  81
  82         RFvRSSITodBm(priv, *rssi, &rx_dbm);
  83
  84         priv->byBBPreEDRSSI = (u8)rx_dbm + 1;
  85         priv->uCurrRSSI = *rssi;
  86
  87         skb_pull(skb, 4);
  88         skb_trim(skb, frame_size);
  89
  90         rx_status.mactime = le64_to_cpu(*tsf_time);
  91         rx_status.band = hw->conf.chandef.chan->band;
  92         rx_status.signal = rx_dbm;
  93         rx_status.flag = 0;
  94         rx_status.freq = hw->conf.chandef.chan->center_freq;
  95
  96         if (!(*rsr & RSR_CRCOK))
  97                 rx_status.flag |= RX_FLAG_FAILED_FCS_CRC;
  98
  99         hdr = (struct ieee80211_hdr *)(skb->data);
 100         fc = hdr->frame_control;
 101
 102         rx_status.rate_idx = rate_idx;
 103
 104         if (ieee80211_has_protected(fc)) {
 105                 if (priv->byLocalID > REV_ID_VT3253_A1)
 106                         rx_status.flag |= RX_FLAG_DECRYPTED;
 107
 108                 /* Drop packet */
 109                 if (!(*new_rsr & NEWRSR_DECRYPTOK))
 110                         return false;
 111         }
 112
 113         memcpy(IEEE80211_SKB_RXCB(skb), &rx_status, sizeof(rx_status));
 114
 115         ieee80211_rx_irqsafe(priv->hw, skb);
 116
 117         return true;
 118 }
 119
 120 bool vnt_receive_frame(struct vnt_private *priv, struct vnt_rx_desc *curr_rd)
 121 {
 122         struct vnt_rd_info *rd_info = curr_rd->rd_info;
 123         struct sk_buff *skb;
 124         u16 frame_size;
 125
 126         skb = rd_info->skb;
 127
 128         dma_unmap_single(&priv->pcid->dev, rd_info->skb_dma,
 129                          priv->rx_buf_sz, DMA_FROM_DEVICE);
 130
 131         frame_size = le16_to_cpu(curr_rd->rd1.req_count)
 132                         - le16_to_cpu(curr_rd->rd0.res_count);
 133
 134         if ((frame_size > 2364) || (frame_size < 33)) {
 135                 /* Frame Size error drop this packet.*/
 136                 dev_dbg(&priv->pcid->dev, "Wrong frame size %d\n", frame_size);
 137                 dev_kfree_skb_irq(skb);
 138                 return true;
 139         }
 140
 141         if (vnt_rx_data(priv, skb, frame_size))
 142                 return true;
 143
 144         dev_kfree_skb_irq(skb);
 145
 146         return true;
 147 }