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 *
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * File: dpc.c
20 *
21 * Purpose: handle dpc rx functions
22 *
23 * Author: Lyndon Chen
24 *
25 * Date: May 20, 2003
26 *
27 * Functions:
28 *
29 * Revision History:
30 *
31 */
32
33#include "device.h"
34#include "baseband.h"
35#include "rf.h"
36#include "dpc.h"
37
38static bool vnt_rx_data(struct vnt_private *priv, struct sk_buff *skb,
39			u16 bytes_received)
40{
41	struct ieee80211_hw *hw = priv->hw;
42	struct ieee80211_supported_band *sband;
43	struct ieee80211_rx_status rx_status = { 0 };
44	struct ieee80211_hdr *hdr;
45	__le16 fc;
46	u8 *rsr, *new_rsr, *rssi;
47	__le64 *tsf_time;
48	u16 frame_size;
49	int ii, r;
50	u8 *rx_sts, *rx_rate, *sq;
51	u8 *skb_data;
52	u8 rate_idx = 0;
53	u8 rate[MAX_RATE] = {2, 4, 11, 22, 12, 18, 24, 36, 48, 72, 96, 108};
54	long rx_dbm;
55
56	/* [31:16]RcvByteCount ( not include 4-byte Status ) */
57	frame_size = le16_to_cpu(*((__le16 *)(skb->data + 2)));
58	if (frame_size > 2346 || frame_size < 14) {
59		dev_dbg(&priv->pcid->dev, "------- WRONG Length 1\n");
60		return false;
61	}
62
63	skb_data = (u8 *)skb->data;
64
65	rx_sts = skb_data;
66	rx_rate = skb_data + 1;
67
68	sband = hw->wiphy->bands[hw->conf.chandef.chan->band];
69
70	for (r = RATE_1M; r < MAX_RATE; r++) {
71		if (*rx_rate == rate[r])
72			break;
73	}
74
75	priv->rx_rate = r;
76
77	for (ii = 0; ii < sband->n_bitrates; ii++) {
78		if (sband->bitrates[ii].hw_value == r) {
79			rate_idx = ii;
80				break;
81		}
82	}
83
84	if (ii == sband->n_bitrates) {
85		dev_dbg(&priv->pcid->dev, "Wrong RxRate %x\n", *rx_rate);
86		return false;
87	}
88
89	tsf_time = (__le64 *)(skb_data + bytes_received - 12);
90	sq = skb_data + bytes_received - 4;
91	new_rsr = skb_data + bytes_received - 3;
92	rssi = skb_data + bytes_received - 2;
93	rsr = skb_data + bytes_received - 1;
94	if (*rsr & (RSR_IVLDTYP | RSR_IVLDLEN))
95		return false;
96
97	RFvRSSITodBm(priv, *rssi, &rx_dbm);
98
99	priv->byBBPreEDRSSI = (u8)rx_dbm + 1;
100	priv->uCurrRSSI = *rssi;
101
102	skb_pull(skb, 4);
103	skb_trim(skb, frame_size);
104
105	rx_status.mactime = le64_to_cpu(*tsf_time);
106	rx_status.band = hw->conf.chandef.chan->band;
107	rx_status.signal = rx_dbm;
108	rx_status.flag = 0;
109	rx_status.freq = hw->conf.chandef.chan->center_freq;
110
111	if (!(*rsr & RSR_CRCOK))
112		rx_status.flag |= RX_FLAG_FAILED_FCS_CRC;
113
114	hdr = (struct ieee80211_hdr *)(skb->data);
115	fc = hdr->frame_control;
116
117	rx_status.rate_idx = rate_idx;
118
119	if (ieee80211_has_protected(fc)) {
120		if (priv->byLocalID > REV_ID_VT3253_A1)
121			rx_status.flag |= RX_FLAG_DECRYPTED;
122
123		/* Drop packet */
124		if (!(*new_rsr & NEWRSR_DECRYPTOK))
125			return false;
126	}
127
128	memcpy(IEEE80211_SKB_RXCB(skb), &rx_status, sizeof(rx_status));
129
130	ieee80211_rx_irqsafe(priv->hw, skb);
131
132	return true;
133}
134
135bool vnt_receive_frame(struct vnt_private *priv, PSRxDesc curr_rd)
136{
137	PDEVICE_RD_INFO rd_info = curr_rd->pRDInfo;
138	struct sk_buff *skb;
139	u16 frame_size;
140
141	skb = rd_info->skb;
142
143	dma_unmap_single(&priv->pcid->dev, rd_info->skb_dma,
144			 priv->rx_buf_sz, DMA_FROM_DEVICE);
145
146	frame_size = le16_to_cpu(curr_rd->m_rd1RD1.wReqCount)
147			- cpu_to_le16(curr_rd->m_rd0RD0.wResCount);
148
149	if ((frame_size > 2364) || (frame_size < 33)) {
150		/* Frame Size error drop this packet.*/
151		dev_dbg(&priv->pcid->dev, "Wrong frame size %d\n", frame_size);
152		dev_kfree_skb_irq(skb);
153		return true;
154	}
155
156	if (vnt_rx_data(priv, skb, frame_size))
157		return true;
158
159	dev_kfree_skb_irq(skb);
160
161	return true;
162}
163