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