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  * Purpose: handle dpc rx functions
   7  *
   8  * Author: Lyndon Chen
   9  *
  10  * Date: May 20, 2003
  11  *
  12  * Functions:
  13  *
  14  * Revision History:
  15  *
  16  */
  17
  18 #include "device.h"
  19 #include "baseband.h"
  20 #include "rf.h"
  21 #include "dpc.h"
  22
  23 static bool vnt_rx_data(struct vnt_private *priv, struct sk_buff *skb,
  24                         u16 bytes_received)
  25 {
  26         struct ieee80211_hw *hw = priv->hw;
  27         struct ieee80211_supported_band *sband;
  28         struct ieee80211_rx_status rx_status = { 0 };
  29         struct ieee80211_hdr *hdr;
  30         __le16 fc;
  31         u8 *rsr, *new_rsr, *rssi;
  32         __le64 *tsf_time;
  33         u16 frame_size;
  34         int ii, r;
  35         u8 *rx_rate;
  36         u8 *skb_data;
  37         u8 rate_idx = 0;
  38         u8 rate[MAX_RATE] = {2, 4, 11, 22, 12, 18, 24, 36, 48, 72, 96, 108};
  39         long rx_dbm;
  40
  41         /* [31:16]RcvByteCount ( not include 4-byte Status ) */
  42         frame_size = le16_to_cpu(*((__le16 *)(skb->data + 2)));
  43         if (frame_size > 2346 || frame_size < 14) {
  44                 dev_dbg(&priv->pcid->dev, "------- WRONG Length 1\n");
  45                 return false;
  46         }
  47
  48         skb_data = (u8 *)skb->data;
  49
  50         rx_rate = skb_data + 1;
  51
  52         sband = hw->wiphy->bands[hw->conf.chandef.chan->band];
  53
  54         for (r = RATE_1M; r < MAX_RATE; r++) {
  55                 if (*rx_rate == rate[r])
  56                         break;
  57         }
  58
  59         priv->rx_rate = r;
  60
  61         for (ii = 0; ii < sband->n_bitrates; ii++) {
  62                 if (sband->bitrates[ii].hw_value == r) {
  63                         rate_idx = ii;
  64                                 break;
  65                 }
  66         }
  67
  68         if (ii == sband->n_bitrates) {
  69                 dev_dbg(&priv->pcid->dev, "Wrong RxRate %x\n", *rx_rate);
  70                 return false;
  71         }
  72
  73         tsf_time = (__le64 *)(skb_data + bytes_received - 12);
  74         new_rsr = skb_data + bytes_received - 3;
  75         rssi = skb_data + bytes_received - 2;
  76         rsr = skb_data + bytes_received - 1;
  77         if (*rsr & (RSR_IVLDTYP | RSR_IVLDLEN))
  78                 return false;
  79
  80         RFvRSSITodBm(priv, *rssi, &rx_dbm);
  81
  82         priv->byBBPreEDRSSI = (u8)rx_dbm + 1;
  83         priv->current_rssi = *rssi;
  84
  85         skb_pull(skb, 4);
  86         skb_trim(skb, frame_size);
  87
  88         rx_status.mactime = le64_to_cpu(*tsf_time);
  89         rx_status.band = hw->conf.chandef.chan->band;
  90         rx_status.signal = rx_dbm;
  91         rx_status.flag = 0;
  92         rx_status.freq = hw->conf.chandef.chan->center_freq;
  93
  94         if (!(*rsr & RSR_CRCOK))
  95                 rx_status.flag |= RX_FLAG_FAILED_FCS_CRC;
  96
  97         hdr = (struct ieee80211_hdr *)(skb->data);
  98         fc = hdr->frame_control;
  99
 100         rx_status.rate_idx = rate_idx;
 101
 102         if (ieee80211_has_protected(fc)) {
 103                 if (priv->local_id > REV_ID_VT3253_A1)
 104                         rx_status.flag |= RX_FLAG_DECRYPTED;
 105
 106                 /* Drop packet */
 107                 if (!(*new_rsr & NEWRSR_DECRYPTOK))
 108                         return false;
 109         }
 110
 111         memcpy(IEEE80211_SKB_RXCB(skb), &rx_status, sizeof(rx_status));
 112
 113         ieee80211_rx_irqsafe(priv->hw, skb);
 114
 115         return true;
 116 }
 117
 118 bool vnt_receive_frame(struct vnt_private *priv, struct vnt_rx_desc *curr_rd)
 119 {
 120         struct vnt_rd_info *rd_info = curr_rd->rd_info;
 121         struct sk_buff *skb;
 122         u16 frame_size;
 123
 124         skb = rd_info->skb;
 125
 126         dma_unmap_single(&priv->pcid->dev, rd_info->skb_dma,
 127                          priv->rx_buf_sz, DMA_FROM_DEVICE);
 128
 129         frame_size = le16_to_cpu(curr_rd->rd1.req_count)
 130                         - le16_to_cpu(curr_rd->rd0.res_count);
 131
 132         if ((frame_size > 2364) || (frame_size < 33)) {
 133                 /* Frame Size error drop this packet.*/
 134                 dev_dbg(&priv->pcid->dev, "Wrong frame size %d\n", frame_size);
 135                 dev_kfree_skb_irq(skb);
 136                 return true;
 137         }
 138
 139         if (vnt_rx_data(priv, skb, frame_size))
 140                 return true;
 141
 142         dev_kfree_skb_irq(skb);
 143
 144         return true;
 145 }