1// SPDX-License-Identifier: GPL-2.0-only 2/* 3 * This file is part of wl1251 4 * 5 * Copyright (c) 1998-2007 Texas Instruments Incorporated 6 * Copyright (C) 2008 Nokia Corporation 7 */ 8 9#include <linux/skbuff.h> 10#include <linux/gfp.h> 11#include <net/mac80211.h> 12 13#include "wl1251.h" 14#include "reg.h" 15#include "io.h" 16#include "rx.h" 17#include "cmd.h" 18#include "acx.h" 19 20static void wl1251_rx_header(struct wl1251 *wl, 21 struct wl1251_rx_descriptor *desc) 22{ 23 u32 rx_packet_ring_addr; 24 25 rx_packet_ring_addr = wl->data_path->rx_packet_ring_addr; 26 if (wl->rx_current_buffer) 27 rx_packet_ring_addr += wl->data_path->rx_packet_ring_chunk_size; 28 29 wl1251_mem_read(wl, rx_packet_ring_addr, desc, sizeof(*desc)); 30} 31 32static void wl1251_rx_status(struct wl1251 *wl, 33 struct wl1251_rx_descriptor *desc, 34 struct ieee80211_rx_status *status, 35 u8 beacon) 36{ 37 u64 mactime; 38 int ret; 39 40 memset(status, 0, sizeof(struct ieee80211_rx_status)); 41 42 status->band = NL80211_BAND_2GHZ; 43 status->mactime = desc->timestamp; 44 45 /* 46 * The rx status timestamp is a 32 bits value while the TSF is a 47 * 64 bits one. 48 * For IBSS merging, TSF is mandatory, so we have to get it 49 * somehow, so we ask for ACX_TSF_INFO. 50 * That could be moved to the get_tsf() hook, but unfortunately, 51 * this one must be atomic, while our SPI routines can sleep. 52 */ 53 if ((wl->bss_type == BSS_TYPE_IBSS) && beacon) { 54 ret = wl1251_acx_tsf_info(wl, &mactime); 55 if (ret == 0) 56 status->mactime = mactime; 57 } 58 59 status->signal = desc->rssi; 60 61 /* 62 * FIXME: guessing that snr needs to be divided by two, otherwise 63 * the values don't make any sense 64 */ 65 wl->noise = desc->rssi - desc->snr / 2; 66 67 status->freq = ieee80211_channel_to_frequency(desc->channel, 68 status->band); 69 70 status->flag |= RX_FLAG_MACTIME_START; 71 72 if (!wl->monitor_present && (desc->flags & RX_DESC_ENCRYPTION_MASK)) { 73 status->flag |= RX_FLAG_IV_STRIPPED | RX_FLAG_MMIC_STRIPPED; 74 75 if (likely(!(desc->flags & RX_DESC_DECRYPT_FAIL))) 76 status->flag |= RX_FLAG_DECRYPTED; 77 78 if (unlikely(desc->flags & RX_DESC_MIC_FAIL)) 79 status->flag |= RX_FLAG_MMIC_ERROR; 80 } 81 82 if (unlikely(!(desc->flags & RX_DESC_VALID_FCS))) 83 status->flag |= RX_FLAG_FAILED_FCS_CRC; 84 85 switch (desc->rate) { 86 /* skip 1 and 12 Mbps because they have same value 0x0a */ 87 case RATE_2MBPS: 88 status->rate_idx = 1; 89 break; 90 case RATE_5_5MBPS: 91 status->rate_idx = 2; 92 break; 93 case RATE_11MBPS: 94 status->rate_idx = 3; 95 break; 96 case RATE_6MBPS: 97 status->rate_idx = 4; 98 break; 99 case RATE_9MBPS: 100 status->rate_idx = 5; 101 break; 102 case RATE_18MBPS: 103 status->rate_idx = 7; 104 break; 105 case RATE_24MBPS: 106 status->rate_idx = 8; 107 break; 108 case RATE_36MBPS: 109 status->rate_idx = 9; 110 break; 111 case RATE_48MBPS: 112 status->rate_idx = 10; 113 break; 114 case RATE_54MBPS: 115 status->rate_idx = 11; 116 break; 117 } 118 119 /* for 1 and 12 Mbps we have to check the modulation */ 120 if (desc->rate == RATE_1MBPS) { 121 if (!(desc->mod_pre & OFDM_RATE_BIT)) 122 /* CCK -> RATE_1MBPS */ 123 status->rate_idx = 0; 124 else 125 /* OFDM -> RATE_12MBPS */ 126 status->rate_idx = 6; 127 } 128 129 if (desc->mod_pre & SHORT_PREAMBLE_BIT) 130 status->enc_flags |= RX_ENC_FLAG_SHORTPRE; 131} 132 133static void wl1251_rx_body(struct wl1251 *wl, 134 struct wl1251_rx_descriptor *desc) 135{ 136 struct sk_buff *skb; 137 struct ieee80211_rx_status status; 138 u8 *rx_buffer, beacon = 0; 139 u16 length, *fc; 140 u32 curr_id, last_id_inc, rx_packet_ring_addr; 141 142 length = WL1251_RX_ALIGN(desc->length - PLCP_HEADER_LENGTH); 143 curr_id = (desc->flags & RX_DESC_SEQNUM_MASK) >> RX_DESC_PACKETID_SHIFT; 144 last_id_inc = (wl->rx_last_id + 1) % (RX_MAX_PACKET_ID + 1); 145 146 if (last_id_inc != curr_id) { 147 wl1251_warning("curr ID:%d, last ID inc:%d", 148 curr_id, last_id_inc); 149 wl->rx_last_id = curr_id; 150 } else { 151 wl->rx_last_id = last_id_inc; 152 } 153 154 rx_packet_ring_addr = wl->data_path->rx_packet_ring_addr + 155 sizeof(struct wl1251_rx_descriptor) + 20; 156 if (wl->rx_current_buffer) 157 rx_packet_ring_addr += wl->data_path->rx_packet_ring_chunk_size; 158 159 skb = __dev_alloc_skb(length, GFP_KERNEL); 160 if (!skb) { 161 wl1251_error("Couldn't allocate RX frame"); 162 return; 163 } 164 165 rx_buffer = skb_put(skb, length); 166 wl1251_mem_read(wl, rx_packet_ring_addr, rx_buffer, length); 167 168 /* The actual length doesn't include the target's alignment */ 169 skb_trim(skb, desc->length - PLCP_HEADER_LENGTH); 170 171 fc = (u16 *)skb->data; 172 173 if ((*fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_BEACON) 174 beacon = 1; 175 176 wl1251_rx_status(wl, desc, &status, beacon); 177 178 wl1251_debug(DEBUG_RX, "rx skb 0x%p: %d B %s", skb, skb->len, 179 beacon ? "beacon" : ""); 180 181 memcpy(IEEE80211_SKB_RXCB(skb), &status, sizeof(status)); 182 ieee80211_rx_ni(wl->hw, skb); 183} 184 185static void wl1251_rx_ack(struct wl1251 *wl) 186{ 187 u32 data, addr; 188 189 if (wl->rx_current_buffer) { 190 addr = ACX_REG_INTERRUPT_TRIG_H; 191 data = INTR_TRIG_RX_PROC1; 192 } else { 193 addr = ACX_REG_INTERRUPT_TRIG; 194 data = INTR_TRIG_RX_PROC0; 195 } 196 197 wl1251_reg_write32(wl, addr, data); 198 199 /* Toggle buffer ring */ 200 wl->rx_current_buffer = !wl->rx_current_buffer; 201} 202 203 204void wl1251_rx(struct wl1251 *wl) 205{ 206 struct wl1251_rx_descriptor *rx_desc; 207 208 if (wl->state != WL1251_STATE_ON) 209 return; 210 211 rx_desc = wl->rx_descriptor; 212 213 /* We first read the frame's header */ 214 wl1251_rx_header(wl, rx_desc); 215 216 /* Now we can read the body */ 217 wl1251_rx_body(wl, rx_desc); 218 219 /* Finally, we need to ACK the RX */ 220 wl1251_rx_ack(wl); 221} 222