1 /* 2 * Copyright (c) 1996, 2003 VIA Networking Technologies, Inc. 3 * All rights reserved. 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License as published by 7 * the Free Software Foundation; either version 2 of the License, or 8 * (at your option) any later version. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License along 16 * with this program; if not, write to the Free Software Foundation, Inc., 17 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * File: dpc.c 20 * 21 * Purpose: handle dpc rx functions 22 * 23 * Author: Lyndon Chen 24 * 25 * Date: May 20, 2003 26 * 27 * Functions: 28 * 29 * Revision History: 30 * 31 */ 32 33 #include "device.h" 34 #include "baseband.h" 35 #include "rf.h" 36 #include "dpc.h" 37 38 static bool vnt_rx_data(struct vnt_private *priv, struct sk_buff *skb, 39 u16 bytes_received) 40 { 41 struct ieee80211_hw *hw = priv->hw; 42 struct ieee80211_supported_band *sband; 43 struct ieee80211_rx_status rx_status = { 0 }; 44 struct ieee80211_hdr *hdr; 45 __le16 fc; 46 u8 *rsr, *new_rsr, *rssi; 47 __le64 *tsf_time; 48 u16 frame_size; 49 int ii, r; 50 u8 *rx_sts, *rx_rate, *sq; 51 u8 *skb_data; 52 u8 rate_idx = 0; 53 u8 rate[MAX_RATE] = {2, 4, 11, 22, 12, 18, 24, 36, 48, 72, 96, 108}; 54 long rx_dbm; 55 56 /* [31:16]RcvByteCount ( not include 4-byte Status ) */ 57 frame_size = le16_to_cpu(*((__le16 *)(skb->data + 2))); 58 if (frame_size > 2346 || frame_size < 14) { 59 dev_dbg(&priv->pcid->dev, "------- WRONG Length 1\n"); 60 return false; 61 } 62 63 skb_data = (u8 *)skb->data; 64 65 rx_sts = skb_data; 66 rx_rate = skb_data + 1; 67 68 sband = hw->wiphy->bands[hw->conf.chandef.chan->band]; 69 70 for (r = RATE_1M; r < MAX_RATE; r++) { 71 if (*rx_rate == rate[r]) 72 break; 73 } 74 75 priv->rx_rate = r; 76 77 for (ii = 0; ii < sband->n_bitrates; ii++) { 78 if (sband->bitrates[ii].hw_value == r) { 79 rate_idx = ii; 80 break; 81 } 82 } 83 84 if (ii == sband->n_bitrates) { 85 dev_dbg(&priv->pcid->dev, "Wrong RxRate %x\n", *rx_rate); 86 return false; 87 } 88 89 tsf_time = (__le64 *)(skb_data + bytes_received - 12); 90 sq = skb_data + bytes_received - 4; 91 new_rsr = skb_data + bytes_received - 3; 92 rssi = skb_data + bytes_received - 2; 93 rsr = skb_data + bytes_received - 1; 94 if (*rsr & (RSR_IVLDTYP | RSR_IVLDLEN)) 95 return false; 96 97 RFvRSSITodBm(priv, *rssi, &rx_dbm); 98 99 priv->byBBPreEDRSSI = (u8)rx_dbm + 1; 100 priv->uCurrRSSI = *rssi; 101 102 skb_pull(skb, 4); 103 skb_trim(skb, frame_size); 104 105 rx_status.mactime = le64_to_cpu(*tsf_time); 106 rx_status.band = hw->conf.chandef.chan->band; 107 rx_status.signal = rx_dbm; 108 rx_status.flag = 0; 109 rx_status.freq = hw->conf.chandef.chan->center_freq; 110 111 if (!(*rsr & RSR_CRCOK)) 112 rx_status.flag |= RX_FLAG_FAILED_FCS_CRC; 113 114 hdr = (struct ieee80211_hdr *)(skb->data); 115 fc = hdr->frame_control; 116 117 rx_status.rate_idx = rate_idx; 118 119 if (ieee80211_has_protected(fc)) { 120 if (priv->byLocalID > REV_ID_VT3253_A1) 121 rx_status.flag |= RX_FLAG_DECRYPTED; 122 123 /* Drop packet */ 124 if (!(*new_rsr & NEWRSR_DECRYPTOK)) 125 return false; 126 } 127 128 memcpy(IEEE80211_SKB_RXCB(skb), &rx_status, sizeof(rx_status)); 129 130 ieee80211_rx_irqsafe(priv->hw, skb); 131 132 return true; 133 } 134 135 bool vnt_receive_frame(struct vnt_private *priv, PSRxDesc curr_rd) 136 { 137 PDEVICE_RD_INFO rd_info = curr_rd->pRDInfo; 138 struct sk_buff *skb; 139 u16 frame_size; 140 141 skb = rd_info->skb; 142 143 dma_unmap_single(&priv->pcid->dev, rd_info->skb_dma, 144 priv->rx_buf_sz, DMA_FROM_DEVICE); 145 146 frame_size = le16_to_cpu(curr_rd->m_rd1RD1.wReqCount) 147 - cpu_to_le16(curr_rd->m_rd0RD0.wResCount); 148 149 if ((frame_size > 2364) || (frame_size < 33)) { 150 /* Frame Size error drop this packet.*/ 151 dev_dbg(&priv->pcid->dev, "Wrong frame size %d\n", frame_size); 152 dev_kfree_skb_irq(skb); 153 return true; 154 } 155 156 if (vnt_rx_data(priv, skb, frame_size)) 157 return true; 158 159 dev_kfree_skb_irq(skb); 160 161 return true; 162 } 163