LXR linux/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
  23static 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->uCurrRSSI = *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->byLocalID > 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
 118bool 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}
 146