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->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 } 117 118 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 } 146