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
vnt_rx_data(struct vnt_private * priv,struct sk_buff * skb,u16 bytes_received)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
vnt_receive_frame(struct vnt_private * priv,struct vnt_rx_desc * curr_rd)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
