staging/vt6655/dpc.c

0001 // SPDX-License-Identifier: GPL-2.0+
0002 /*
0003  * Copyright (c) 1996, 2003 VIA Networking Technologies, Inc.
0004  * All rights reserved.
0005  *
0006  * Purpose: handle dpc rx functions
0007  *
0008  * Author: Lyndon Chen
0009  *
0010  * Date: May 20, 2003
0011  *
0012  * Functions:
0013  *
0014  * Revision History:
0015  *
0016  */
0017
0018 #include "device.h"
0019 #include "baseband.h"
0020 #include "rf.h"
0021 #include "dpc.h"
0022
0023 static bool vnt_rx_data(struct vnt_private *priv, struct sk_buff *skb,
0024             u16 bytes_received)
0025 {
0026     struct ieee80211_hw *hw = priv->hw;
0027     struct ieee80211_supported_band *sband;
0028     struct ieee80211_rx_status rx_status = { 0 };
0029     struct ieee80211_hdr *hdr;
0030     __le16 fc;
0031     u8 *rsr, *new_rsr, *rssi;
0032     __le64 *tsf_time;
0033     u16 frame_size;
0034     int ii, r;
0035     u8 *rx_rate;
0036     u8 *skb_data;
0037     u8 rate_idx = 0;
0038     u8 rate[MAX_RATE] = {2, 4, 11, 22, 12, 18, 24, 36, 48, 72, 96, 108};
0039     long rx_dbm;
0040
0041     /* [31:16]RcvByteCount ( not include 4-byte Status ) */
0042     frame_size = le16_to_cpu(*((__le16 *)(skb->data + 2)));
0043     if (frame_size > 2346 || frame_size < 14) {
0044         dev_dbg(&priv->pcid->dev, "------- WRONG Length 1\n");
0045         return false;
0046     }
0047
0048     skb_data = (u8 *)skb->data;
0049
0050     rx_rate = skb_data + 1;
0051
0052     sband = hw->wiphy->bands[hw->conf.chandef.chan->band];
0053
0054     for (r = RATE_1M; r < MAX_RATE; r++) {
0055         if (*rx_rate == rate[r])
0056             break;
0057     }
0058
0059     priv->rx_rate = r;
0060
0061     for (ii = 0; ii < sband->n_bitrates; ii++) {
0062         if (sband->bitrates[ii].hw_value == r) {
0063             rate_idx = ii;
0064                 break;
0065         }
0066     }
0067
0068     if (ii == sband->n_bitrates) {
0069         dev_dbg(&priv->pcid->dev, "Wrong RxRate %x\n", *rx_rate);
0070         return false;
0071     }
0072
0073     tsf_time = (__le64 *)(skb_data + bytes_received - 12);
0074     new_rsr = skb_data + bytes_received - 3;
0075     rssi = skb_data + bytes_received - 2;
0076     rsr = skb_data + bytes_received - 1;
0077     if (*rsr & (RSR_IVLDTYP | RSR_IVLDLEN))
0078         return false;
0079
0080     RFvRSSITodBm(priv, *rssi, &rx_dbm);
0081
0082     priv->byBBPreEDRSSI = (u8)rx_dbm + 1;
0083     priv->current_rssi = *rssi;
0084
0085     skb_pull(skb, 4);
0086     skb_trim(skb, frame_size);
0087
0088     rx_status.mactime = le64_to_cpu(*tsf_time);
0089     rx_status.band = hw->conf.chandef.chan->band;
0090     rx_status.signal = rx_dbm;
0091     rx_status.flag = 0;
0092     rx_status.freq = hw->conf.chandef.chan->center_freq;
0093
0094     if (!(*rsr & RSR_CRCOK))
0095         rx_status.flag |= RX_FLAG_FAILED_FCS_CRC;
0096
0097     hdr = (struct ieee80211_hdr *)(skb->data);
0098     fc = hdr->frame_control;
0099
0100     rx_status.rate_idx = rate_idx;
0101
0102     if (ieee80211_has_protected(fc)) {
0103         if (priv->local_id > REV_ID_VT3253_A1)
0104             rx_status.flag |= RX_FLAG_DECRYPTED;
0105
0106         /* Drop packet */
0107         if (!(*new_rsr & NEWRSR_DECRYPTOK))
0108             return false;
0109     }
0110
0111     memcpy(IEEE80211_SKB_RXCB(skb), &rx_status, sizeof(rx_status));
0112
0113     ieee80211_rx_irqsafe(priv->hw, skb);
0114
0115     return true;
0116 }
0117
0118 bool vnt_receive_frame(struct vnt_private *priv, struct vnt_rx_desc *curr_rd)
0119 {
0120     struct vnt_rd_info *rd_info = curr_rd->rd_info;
0121     struct sk_buff *skb;
0122     u16 frame_size;
0123
0124     skb = rd_info->skb;
0125
0126     dma_unmap_single(&priv->pcid->dev, rd_info->skb_dma,
0127              priv->rx_buf_sz, DMA_FROM_DEVICE);
0128
0129     frame_size = le16_to_cpu(curr_rd->rd1.req_count)
0130             - le16_to_cpu(curr_rd->rd0.res_count);
0131
0132     if ((frame_size > 2364) || (frame_size < 33)) {
0133         /* Frame Size error drop this packet.*/
0134         dev_dbg(&priv->pcid->dev, "Wrong frame size %d\n", frame_size);
0135         dev_kfree_skb_irq(skb);
0136         return true;
0137     }
0138
0139     if (vnt_rx_data(priv, skb, frame_size))
0140         return true;
0141
0142     dev_kfree_skb_irq(skb);
0143
0144     return true;
0145 }