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92b96797 FB |
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 | * | |
92b96797 FB |
15 | * |
16 | * File: dpc.c | |
17 | * | |
18 | * Purpose: handle dpc rx functions | |
19 | * | |
20 | * Author: Lyndon Chen | |
21 | * | |
22 | * Date: May 20, 2003 | |
23 | * | |
24 | * Functions: | |
92b96797 FB |
25 | * |
26 | * Revision History: | |
27 | * | |
28 | */ | |
29 | ||
d820fa95 | 30 | #include "dpc.h" |
92b96797 | 31 | #include "device.h" |
92b96797 | 32 | #include "mac.h" |
92b96797 | 33 | #include "baseband.h" |
92b96797 | 34 | #include "rf.h" |
92b96797 | 35 | |
63b9907f MP |
36 | int vnt_rx_data(struct vnt_private *priv, struct vnt_rcb *ptr_rcb, |
37 | unsigned long bytes_received) | |
38 | { | |
39 | struct ieee80211_hw *hw = priv->hw; | |
40 | struct ieee80211_supported_band *sband; | |
41 | struct sk_buff *skb; | |
42 | struct ieee80211_rx_status rx_status = { 0 }; | |
43 | struct ieee80211_hdr *hdr; | |
44 | __le16 fc; | |
45 | u8 *rsr, *new_rsr, *rssi, *frame; | |
46 | __le64 *tsf_time; | |
47 | u32 frame_size; | |
48 | int ii, r; | |
49 | u8 *rx_sts, *rx_rate, *sq, *sq_3; | |
50 | u32 wbk_status; | |
51 | u8 *skb_data; | |
52 | u16 *pay_load_len; | |
53 | u16 pay_load_with_padding; | |
54 | u8 rate_idx = 0; | |
55 | u8 rate[MAX_RATE] = {2, 4, 11, 22, 12, 18, 24, 36, 48, 72, 96, 108}; | |
56 | long rx_dbm; | |
57 | ||
58 | skb = ptr_rcb->skb; | |
59 | ||
60 | /* [31:16]RcvByteCount ( not include 4-byte Status ) */ | |
61 | wbk_status = *((u32 *)(skb->data)); | |
62 | frame_size = wbk_status >> 16; | |
63 | frame_size += 4; | |
64 | ||
65 | if (bytes_received != frame_size) { | |
66 | dev_dbg(&priv->usb->dev, "------- WRONG Length 1\n"); | |
67 | return false; | |
68 | } | |
69 | ||
70 | if ((bytes_received > 2372) || (bytes_received <= 40)) { | |
71 | /* Frame Size error drop this packet.*/ | |
72 | dev_dbg(&priv->usb->dev, "------ WRONG Length 2\n"); | |
73 | return false; | |
74 | } | |
75 | ||
76 | skb_data = (u8 *)skb->data; | |
77 | ||
78 | rx_sts = skb_data+4; | |
79 | rx_rate = skb_data+5; | |
80 | ||
81 | /* real Frame Size = USBframe_size -4WbkStatus - 4RxStatus */ | |
82 | /* -8TSF - 4RSR - 4SQ3 - ?Padding */ | |
83 | ||
84 | /* if SQ3 the range is 24~27, if no SQ3 the range is 20~23 */ | |
85 | ||
86 | pay_load_len = (u16 *) (skb_data + 6); | |
87 | ||
88 | /*Fix hardware bug => PLCP_Length error */ | |
89 | if (((bytes_received - (*pay_load_len)) > 27) || | |
90 | ((bytes_received - (*pay_load_len)) < 24) || | |
91 | (bytes_received < (*pay_load_len))) { | |
92 | dev_dbg(&priv->usb->dev, "Wrong PLCP Length %x\n", | |
93 | *pay_load_len); | |
94 | return false; | |
95 | } | |
96 | ||
97 | sband = hw->wiphy->bands[hw->conf.chandef.chan->band]; | |
98 | ||
99 | for (r = RATE_1M; r < MAX_RATE; r++) { | |
100 | if (*rx_rate == rate[r]) | |
101 | break; | |
102 | } | |
103 | ||
104 | priv->rx_rate = r; | |
105 | ||
106 | for (ii = 0; ii < sband->n_bitrates; ii++) { | |
107 | if (sband->bitrates[ii].hw_value == r) { | |
108 | rate_idx = ii; | |
109 | break; | |
110 | } | |
111 | } | |
112 | ||
113 | if (ii == sband->n_bitrates) { | |
114 | dev_dbg(&priv->usb->dev, "Wrong RxRate %x\n", *rx_rate); | |
115 | return false; | |
116 | } | |
117 | ||
118 | pay_load_with_padding = ((*pay_load_len / 4) + | |
119 | ((*pay_load_len % 4) ? 1 : 0)) * 4; | |
120 | ||
121 | tsf_time = (__le64 *)(skb_data + 8 + pay_load_with_padding); | |
122 | ||
123 | priv->tsf_time = le64_to_cpu(*tsf_time); | |
124 | ||
65df77e2 | 125 | if (priv->bb_type == BB_TYPE_11G) { |
63b9907f MP |
126 | sq_3 = skb_data + 8 + pay_load_with_padding + 12; |
127 | sq = sq_3; | |
128 | } else { | |
129 | sq = skb_data + 8 + pay_load_with_padding + 8; | |
130 | sq_3 = sq; | |
131 | } | |
132 | ||
133 | new_rsr = skb_data + 8 + pay_load_with_padding + 9; | |
134 | rssi = skb_data + 8 + pay_load_with_padding + 10; | |
47b41d9f | 135 | |
63b9907f | 136 | rsr = skb_data + 8 + pay_load_with_padding + 11; |
47b41d9f MP |
137 | if (*rsr & (RSR_IVLDTYP | RSR_IVLDLEN)) |
138 | return false; | |
63b9907f MP |
139 | |
140 | frame_size = *pay_load_len; | |
141 | ||
142 | vnt_rf_rssi_to_dbm(priv, *rssi, &rx_dbm); | |
143 | ||
12687222 MP |
144 | priv->bb_pre_ed_rssi = (u8)rx_dbm + 1; |
145 | priv->current_rssi = priv->bb_pre_ed_rssi; | |
63b9907f MP |
146 | |
147 | frame = skb_data + 8; | |
148 | ||
149 | skb_pull(skb, 8); | |
150 | skb_trim(skb, frame_size); | |
151 | ||
152 | rx_status.mactime = priv->tsf_time; | |
153 | rx_status.band = hw->conf.chandef.chan->band; | |
154 | rx_status.signal = rx_dbm; | |
155 | rx_status.flag = 0; | |
156 | rx_status.freq = hw->conf.chandef.chan->center_freq; | |
157 | ||
47b41d9f MP |
158 | if (!(*rsr & RSR_CRCOK)) |
159 | rx_status.flag |= RX_FLAG_FAILED_FCS_CRC; | |
160 | ||
63b9907f MP |
161 | hdr = (struct ieee80211_hdr *)(skb->data); |
162 | fc = hdr->frame_control; | |
163 | ||
164 | rx_status.rate_idx = rate_idx; | |
165 | ||
166 | if (ieee80211_has_protected(fc)) { | |
f1945a15 | 167 | if (priv->local_id > REV_ID_VT3253_A1) { |
47b41d9f MP |
168 | rx_status.flag |= RX_FLAG_DECRYPTED; |
169 | ||
170 | /* Drop packet */ | |
171 | if (!(*new_rsr & NEWRSR_DECRYPTOK)) { | |
172 | dev_kfree_skb(skb); | |
173 | return true; | |
174 | } | |
175 | } | |
63b9907f MP |
176 | } |
177 | ||
178 | memcpy(IEEE80211_SKB_RXCB(skb), &rx_status, sizeof(rx_status)); | |
179 | ||
180 | ieee80211_rx_irqsafe(priv->hw, skb); | |
181 | ||
182 | return true; | |
183 | } |