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 } 148