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221 lines
5.2 KiB
221 lines
5.2 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* This file is part of wl1251 |
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* |
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* Copyright (c) 1998-2007 Texas Instruments Incorporated |
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* Copyright (C) 2008 Nokia Corporation |
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*/ |
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#include <linux/skbuff.h> |
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#include <linux/gfp.h> |
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#include <net/mac80211.h> |
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#include "wl1251.h" |
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#include "reg.h" |
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#include "io.h" |
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#include "rx.h" |
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#include "cmd.h" |
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#include "acx.h" |
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static void wl1251_rx_header(struct wl1251 *wl, |
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struct wl1251_rx_descriptor *desc) |
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{ |
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u32 rx_packet_ring_addr; |
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rx_packet_ring_addr = wl->data_path->rx_packet_ring_addr; |
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if (wl->rx_current_buffer) |
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rx_packet_ring_addr += wl->data_path->rx_packet_ring_chunk_size; |
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wl1251_mem_read(wl, rx_packet_ring_addr, desc, sizeof(*desc)); |
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} |
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static void wl1251_rx_status(struct wl1251 *wl, |
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struct wl1251_rx_descriptor *desc, |
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struct ieee80211_rx_status *status, |
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u8 beacon) |
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{ |
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u64 mactime; |
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int ret; |
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memset(status, 0, sizeof(struct ieee80211_rx_status)); |
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status->band = NL80211_BAND_2GHZ; |
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status->mactime = desc->timestamp; |
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/* |
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* The rx status timestamp is a 32 bits value while the TSF is a |
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* 64 bits one. |
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* For IBSS merging, TSF is mandatory, so we have to get it |
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* somehow, so we ask for ACX_TSF_INFO. |
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* That could be moved to the get_tsf() hook, but unfortunately, |
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* this one must be atomic, while our SPI routines can sleep. |
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*/ |
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if ((wl->bss_type == BSS_TYPE_IBSS) && beacon) { |
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ret = wl1251_acx_tsf_info(wl, &mactime); |
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if (ret == 0) |
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status->mactime = mactime; |
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} |
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status->signal = desc->rssi; |
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/* |
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* FIXME: guessing that snr needs to be divided by two, otherwise |
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* the values don't make any sense |
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*/ |
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wl->noise = desc->rssi - desc->snr / 2; |
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status->freq = ieee80211_channel_to_frequency(desc->channel, |
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status->band); |
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status->flag |= RX_FLAG_MACTIME_START; |
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if (!wl->monitor_present && (desc->flags & RX_DESC_ENCRYPTION_MASK)) { |
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status->flag |= RX_FLAG_IV_STRIPPED | RX_FLAG_MMIC_STRIPPED; |
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if (likely(!(desc->flags & RX_DESC_DECRYPT_FAIL))) |
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status->flag |= RX_FLAG_DECRYPTED; |
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if (unlikely(desc->flags & RX_DESC_MIC_FAIL)) |
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status->flag |= RX_FLAG_MMIC_ERROR; |
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} |
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if (unlikely(!(desc->flags & RX_DESC_VALID_FCS))) |
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status->flag |= RX_FLAG_FAILED_FCS_CRC; |
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switch (desc->rate) { |
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/* skip 1 and 12 Mbps because they have same value 0x0a */ |
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case RATE_2MBPS: |
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status->rate_idx = 1; |
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break; |
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case RATE_5_5MBPS: |
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status->rate_idx = 2; |
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break; |
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case RATE_11MBPS: |
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status->rate_idx = 3; |
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break; |
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case RATE_6MBPS: |
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status->rate_idx = 4; |
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break; |
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case RATE_9MBPS: |
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status->rate_idx = 5; |
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break; |
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case RATE_18MBPS: |
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status->rate_idx = 7; |
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break; |
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case RATE_24MBPS: |
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status->rate_idx = 8; |
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break; |
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case RATE_36MBPS: |
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status->rate_idx = 9; |
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break; |
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case RATE_48MBPS: |
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status->rate_idx = 10; |
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break; |
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case RATE_54MBPS: |
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status->rate_idx = 11; |
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break; |
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} |
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/* for 1 and 12 Mbps we have to check the modulation */ |
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if (desc->rate == RATE_1MBPS) { |
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if (!(desc->mod_pre & OFDM_RATE_BIT)) |
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/* CCK -> RATE_1MBPS */ |
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status->rate_idx = 0; |
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else |
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/* OFDM -> RATE_12MBPS */ |
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status->rate_idx = 6; |
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} |
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if (desc->mod_pre & SHORT_PREAMBLE_BIT) |
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status->enc_flags |= RX_ENC_FLAG_SHORTPRE; |
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} |
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static void wl1251_rx_body(struct wl1251 *wl, |
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struct wl1251_rx_descriptor *desc) |
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{ |
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struct sk_buff *skb; |
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struct ieee80211_rx_status status; |
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u8 *rx_buffer, beacon = 0; |
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u16 length, *fc; |
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u32 curr_id, last_id_inc, rx_packet_ring_addr; |
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length = WL1251_RX_ALIGN(desc->length - PLCP_HEADER_LENGTH); |
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curr_id = (desc->flags & RX_DESC_SEQNUM_MASK) >> RX_DESC_PACKETID_SHIFT; |
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last_id_inc = (wl->rx_last_id + 1) % (RX_MAX_PACKET_ID + 1); |
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if (last_id_inc != curr_id) { |
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wl1251_warning("curr ID:%d, last ID inc:%d", |
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curr_id, last_id_inc); |
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wl->rx_last_id = curr_id; |
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} else { |
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wl->rx_last_id = last_id_inc; |
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} |
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rx_packet_ring_addr = wl->data_path->rx_packet_ring_addr + |
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sizeof(struct wl1251_rx_descriptor) + 20; |
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if (wl->rx_current_buffer) |
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rx_packet_ring_addr += wl->data_path->rx_packet_ring_chunk_size; |
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skb = __dev_alloc_skb(length, GFP_KERNEL); |
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if (!skb) { |
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wl1251_error("Couldn't allocate RX frame"); |
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return; |
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} |
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rx_buffer = skb_put(skb, length); |
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wl1251_mem_read(wl, rx_packet_ring_addr, rx_buffer, length); |
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/* The actual length doesn't include the target's alignment */ |
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skb_trim(skb, desc->length - PLCP_HEADER_LENGTH); |
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fc = (u16 *)skb->data; |
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if ((*fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_BEACON) |
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beacon = 1; |
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wl1251_rx_status(wl, desc, &status, beacon); |
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wl1251_debug(DEBUG_RX, "rx skb 0x%p: %d B %s", skb, skb->len, |
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beacon ? "beacon" : ""); |
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memcpy(IEEE80211_SKB_RXCB(skb), &status, sizeof(status)); |
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ieee80211_rx_ni(wl->hw, skb); |
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} |
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static void wl1251_rx_ack(struct wl1251 *wl) |
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{ |
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u32 data, addr; |
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if (wl->rx_current_buffer) { |
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addr = ACX_REG_INTERRUPT_TRIG_H; |
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data = INTR_TRIG_RX_PROC1; |
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} else { |
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addr = ACX_REG_INTERRUPT_TRIG; |
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data = INTR_TRIG_RX_PROC0; |
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} |
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wl1251_reg_write32(wl, addr, data); |
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/* Toggle buffer ring */ |
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wl->rx_current_buffer = !wl->rx_current_buffer; |
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} |
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void wl1251_rx(struct wl1251 *wl) |
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{ |
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struct wl1251_rx_descriptor *rx_desc; |
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if (wl->state != WL1251_STATE_ON) |
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return; |
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rx_desc = wl->rx_descriptor; |
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/* We first read the frame's header */ |
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wl1251_rx_header(wl, rx_desc); |
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/* Now we can read the body */ |
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wl1251_rx_body(wl, rx_desc); |
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/* Finally, we need to ACK the RX */ |
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wl1251_rx_ack(wl); |
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}
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