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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 1996, 2003 VIA Networking Technologies, Inc.
* All rights reserved.
*
* File: dpc.c
*
* Purpose: handle dpc rx functions
*
* Author: Lyndon Chen
*
* Date: May 20, 2003
*
* Functions:
*
* Revision History:
*
*/
#include "dpc.h"
#include "device.h"
#include "mac.h"
#include "baseband.h"
#include "rf.h"
int vnt_rx_data(struct vnt_private *priv, struct vnt_rcb *ptr_rcb,
unsigned long bytes_received)
{
struct ieee80211_hw *hw = priv->hw;
struct ieee80211_supported_band *sband;
struct sk_buff *skb;
struct ieee80211_rx_status rx_status = { 0 };
struct ieee80211_hdr *hdr;
__le16 fc;
u8 *rsr, *new_rsr, *rssi;
__le64 *tsf_time;
u32 frame_size;
int ii, r;
u8 *rx_rate, *sq, *sq_3;
u32 wbk_status;
u8 *skb_data;
u16 *pay_load_len;
u16 pay_load_with_padding;
u8 rate_idx = 0;
u8 rate[MAX_RATE] = {2, 4, 11, 22, 12, 18, 24, 36, 48, 72, 96, 108};
long rx_dbm;
skb = ptr_rcb->skb;
/* [31:16]RcvByteCount ( not include 4-byte Status ) */
wbk_status = *((u32 *)(skb->data));
frame_size = wbk_status >> 16;
frame_size += 4;
if (bytes_received != frame_size) {
dev_dbg(&priv->usb->dev, "------- WRONG Length 1\n");
return false;
}
if ((bytes_received > 2372) || (bytes_received <= 40)) {
/* Frame Size error drop this packet.*/
dev_dbg(&priv->usb->dev, "------ WRONG Length 2\n");
return false;
}
skb_data = (u8 *)skb->data;
rx_rate = skb_data + 5;
/* real Frame Size = USBframe_size -4WbkStatus - 4RxStatus */
/* -8TSF - 4RSR - 4SQ3 - ?Padding */
/* if SQ3 the range is 24~27, if no SQ3 the range is 20~23 */
pay_load_len = (u16 *)(skb_data + 6);
/*Fix hardware bug => PLCP_Length error */
if (((bytes_received - (*pay_load_len)) > 27) ||
((bytes_received - (*pay_load_len)) < 24) ||
(bytes_received < (*pay_load_len))) {
dev_dbg(&priv->usb->dev, "Wrong PLCP Length %x\n",
*pay_load_len);
return false;
}
sband = hw->wiphy->bands[hw->conf.chandef.chan->band];
for (r = RATE_1M; r < MAX_RATE; r++) {
if (*rx_rate == rate[r])
break;
}
priv->rx_rate = r;
for (ii = 0; ii < sband->n_bitrates; ii++) {
if (sband->bitrates[ii].hw_value == r) {
rate_idx = ii;
break;
}
}
if (ii == sband->n_bitrates) {
dev_dbg(&priv->usb->dev, "Wrong RxRate %x\n", *rx_rate);
return false;
}
pay_load_with_padding = ((*pay_load_len / 4) +
((*pay_load_len % 4) ? 1 : 0)) * 4;
tsf_time = (__le64 *)(skb_data + 8 + pay_load_with_padding);
priv->tsf_time = le64_to_cpu(*tsf_time);
if (priv->bb_type == BB_TYPE_11G) {
sq_3 = skb_data + 8 + pay_load_with_padding + 12;
sq = sq_3;
} else {
sq = skb_data + 8 + pay_load_with_padding + 8;
sq_3 = sq;
}
new_rsr = skb_data + 8 + pay_load_with_padding + 9;
rssi = skb_data + 8 + pay_load_with_padding + 10;
rsr = skb_data + 8 + pay_load_with_padding + 11;
if (*rsr & (RSR_IVLDTYP | RSR_IVLDLEN))
return false;
frame_size = *pay_load_len;
vnt_rf_rssi_to_dbm(priv, *rssi, &rx_dbm);
priv->bb_pre_ed_rssi = (u8)-rx_dbm + 1;
priv->current_rssi = priv->bb_pre_ed_rssi;
skb_pull(skb, 8);
skb_trim(skb, frame_size);
rx_status.mactime = priv->tsf_time;
rx_status.band = hw->conf.chandef.chan->band;
rx_status.signal = rx_dbm;
rx_status.flag = 0;
rx_status.freq = hw->conf.chandef.chan->center_freq;
if (!(*rsr & RSR_CRCOK))
rx_status.flag |= RX_FLAG_FAILED_FCS_CRC;
hdr = (struct ieee80211_hdr *)(skb->data);
fc = hdr->frame_control;
rx_status.rate_idx = rate_idx;
if (ieee80211_has_protected(fc)) {
if (priv->local_id > REV_ID_VT3253_A1) {
rx_status.flag |= RX_FLAG_DECRYPTED;
/* Drop packet */
if (!(*new_rsr & NEWRSR_DECRYPTOK)) {
dev_kfree_skb(skb);
return true;
}
}
}
memcpy(IEEE80211_SKB_RXCB(skb), &rx_status, sizeof(rx_status));
ieee80211_rx_irqsafe(priv->hw, skb);
return true;
}
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