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, *; |
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, byCurrRSSI: *rssi, pldBm: &rx_dbm); |
81 | |
82 | priv->bb_pre_edrssi = (u8)rx_dbm + 1; |
83 | priv->current_rssi = *rssi; |
84 | |
85 | skb_pull(skb, len: 4); |
86 | skb_trim(skb, len: 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(hw: 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, bytes_received: frame_size)) |
140 | return true; |
141 | |
142 | dev_kfree_skb_irq(skb); |
143 | |
144 | return true; |
145 | } |
146 | |