146 lines · 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 functions7 *8 * Author: Lyndon Chen9 *10 * Date: May 20, 200311 *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->bb_pre_edrssi = (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 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