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
23static 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
118bool 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