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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;
struct vnt_rx_header *head;
struct vnt_rx_tail *tail;
u32 frame_size;
int ii;
u16 rx_bitrate, pay_load_with_padding;
u8 rate_idx = 0;
long rx_dbm;
skb = ptr_rcb->skb;
rx_status = IEEE80211_SKB_RXCB(skb);
/* [31:16]RcvByteCount ( not include 4-byte Status ) */
head = (struct vnt_rx_header *)skb->data;
frame_size = head->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;
}
/* 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 */
/*Fix hardware bug => PLCP_Length error */
if (((bytes_received - head->pay_load_len) > 27) ||
((bytes_received - head->pay_load_len) < 24) ||
(bytes_received < head->pay_load_len)) {
dev_dbg(&priv->usb->dev, "Wrong PLCP Length %x\n",
head->pay_load_len);
return false;
}
sband = hw->wiphy->bands[hw->conf.chandef.chan->band];
rx_bitrate = head->rx_rate * 5; /* rx_rate * 5 */
for (ii = 0; ii < sband->n_bitrates; ii++) {
if (sband->bitrates[ii].bitrate == rx_bitrate) {
rate_idx = ii;
break;
}
}
if (ii == sband->n_bitrates) {
dev_dbg(&priv->usb->dev, "Wrong Rx Bit Rate %d\n", rx_bitrate);
return false;
}
pay_load_with_padding = ((head->pay_load_len / 4) +
((head->pay_load_len % 4) ? 1 : 0)) * 4;
tail = (struct vnt_rx_tail *)(skb->data +
sizeof(*head) + pay_load_with_padding);
priv->tsf_time = le64_to_cpu(tail->tsf_time);
if (tail->rsr & (RSR_IVLDTYP | RSR_IVLDLEN))
return false;
vnt_rf_rssi_to_dbm(priv, tail->rssi, &rx_dbm);
priv->bb_pre_ed_rssi = (u8)rx_dbm + 1;
priv->current_rssi = priv->bb_pre_ed_rssi;
skb_pull(skb, sizeof(*head));
skb_trim(skb, head->pay_load_len);
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 (!(tail->rsr & RSR_CRCOK))
rx_status->flag |= RX_FLAG_FAILED_FCS_CRC;
rx_status->rate_idx = rate_idx;
if (tail->new_rsr & NEWRSR_DECRYPTOK)
rx_status->flag |= RX_FLAG_DECRYPTED;
ieee80211_rx_irqsafe(priv->hw, skb);
return true;
}
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