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 "dpc.h"
21 #include "device.h"
22 #include "mac.h"
23 #include "baseband.h"
24 #include "rf.h"
25
vnt_rx_data(struct vnt_private * priv,struct vnt_rcb * ptr_rcb,unsigned long bytes_received)26 int vnt_rx_data(struct vnt_private *priv, struct vnt_rcb *ptr_rcb,
27 unsigned long bytes_received)
28 {
29 struct ieee80211_hw *hw = priv->hw;
30 struct ieee80211_supported_band *sband;
31 struct sk_buff *skb;
32 struct ieee80211_rx_status rx_status = { 0 };
33 struct ieee80211_hdr *hdr;
34 __le16 fc;
35 u8 *rsr, *new_rsr, *rssi;
36 __le64 *tsf_time;
37 u32 frame_size;
38 int ii, r;
39 u8 *rx_rate, *sq, *sq_3;
40 u32 wbk_status;
41 u8 *skb_data;
42 u16 *pay_load_len;
43 u16 pay_load_with_padding;
44 u8 rate_idx = 0;
45 u8 rate[MAX_RATE] = {2, 4, 11, 22, 12, 18, 24, 36, 48, 72, 96, 108};
46 long rx_dbm;
47
48 skb = ptr_rcb->skb;
49
50 /* [31:16]RcvByteCount ( not include 4-byte Status ) */
51 wbk_status = *((u32 *)(skb->data));
52 frame_size = wbk_status >> 16;
53 frame_size += 4;
54
55 if (bytes_received != frame_size) {
56 dev_dbg(&priv->usb->dev, "------- WRONG Length 1\n");
57 return false;
58 }
59
60 if ((bytes_received > 2372) || (bytes_received <= 40)) {
61 /* Frame Size error drop this packet.*/
62 dev_dbg(&priv->usb->dev, "------ WRONG Length 2\n");
63 return false;
64 }
65
66 skb_data = (u8 *)skb->data;
67
68 rx_rate = skb_data + 5;
69
70 /* real Frame Size = USBframe_size -4WbkStatus - 4RxStatus */
71 /* -8TSF - 4RSR - 4SQ3 - ?Padding */
72
73 /* if SQ3 the range is 24~27, if no SQ3 the range is 20~23 */
74
75 pay_load_len = (u16 *)(skb_data + 6);
76
77 /*Fix hardware bug => PLCP_Length error */
78 if (((bytes_received - (*pay_load_len)) > 27) ||
79 ((bytes_received - (*pay_load_len)) < 24) ||
80 (bytes_received < (*pay_load_len))) {
81 dev_dbg(&priv->usb->dev, "Wrong PLCP Length %x\n",
82 *pay_load_len);
83 return false;
84 }
85
86 sband = hw->wiphy->bands[hw->conf.chandef.chan->band];
87
88 for (r = RATE_1M; r < MAX_RATE; r++) {
89 if (*rx_rate == rate[r])
90 break;
91 }
92
93 priv->rx_rate = r;
94
95 for (ii = 0; ii < sband->n_bitrates; ii++) {
96 if (sband->bitrates[ii].hw_value == r) {
97 rate_idx = ii;
98 break;
99 }
100 }
101
102 if (ii == sband->n_bitrates) {
103 dev_dbg(&priv->usb->dev, "Wrong RxRate %x\n", *rx_rate);
104 return false;
105 }
106
107 pay_load_with_padding = ((*pay_load_len / 4) +
108 ((*pay_load_len % 4) ? 1 : 0)) * 4;
109
110 tsf_time = (__le64 *)(skb_data + 8 + pay_load_with_padding);
111
112 priv->tsf_time = le64_to_cpu(*tsf_time);
113
114 if (priv->bb_type == BB_TYPE_11G) {
115 sq_3 = skb_data + 8 + pay_load_with_padding + 12;
116 sq = sq_3;
117 } else {
118 sq = skb_data + 8 + pay_load_with_padding + 8;
119 sq_3 = sq;
120 }
121
122 new_rsr = skb_data + 8 + pay_load_with_padding + 9;
123 rssi = skb_data + 8 + pay_load_with_padding + 10;
124
125 rsr = skb_data + 8 + pay_load_with_padding + 11;
126 if (*rsr & (RSR_IVLDTYP | RSR_IVLDLEN))
127 return false;
128
129 frame_size = *pay_load_len;
130
131 vnt_rf_rssi_to_dbm(priv, *rssi, &rx_dbm);
132
133 priv->bb_pre_ed_rssi = (u8)rx_dbm + 1;
134 priv->current_rssi = priv->bb_pre_ed_rssi;
135
136 skb_pull(skb, 8);
137 skb_trim(skb, frame_size);
138
139 rx_status.mactime = priv->tsf_time;
140 rx_status.band = hw->conf.chandef.chan->band;
141 rx_status.signal = rx_dbm;
142 rx_status.flag = 0;
143 rx_status.freq = hw->conf.chandef.chan->center_freq;
144
145 if (!(*rsr & RSR_CRCOK))
146 rx_status.flag |= RX_FLAG_FAILED_FCS_CRC;
147
148 hdr = (struct ieee80211_hdr *)(skb->data);
149 fc = hdr->frame_control;
150
151 rx_status.rate_idx = rate_idx;
152
153 if (ieee80211_has_protected(fc)) {
154 if (priv->local_id > REV_ID_VT3253_A1) {
155 rx_status.flag |= RX_FLAG_DECRYPTED;
156
157 /* Drop packet */
158 if (!(*new_rsr & NEWRSR_DECRYPTOK)) {
159 dev_kfree_skb(skb);
160 return true;
161 }
162 }
163 }
164
165 memcpy(IEEE80211_SKB_RXCB(skb), &rx_status, sizeof(rx_status));
166
167 ieee80211_rx_irqsafe(priv->hw, skb);
168
169 return true;
170 }
171
