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Release 4.11 drivers/net/wireless/ti/wl1251/rx.c

/*
 * This file is part of wl1251
 *
 * Copyright (c) 1998-2007 Texas Instruments Incorporated
 * Copyright (C) 2008 Nokia Corporation
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA
 *
 */

#include <linux/skbuff.h>
#include <linux/gfp.h>
#include <net/mac80211.h>

#include "wl1251.h"
#include "reg.h"
#include "io.h"
#include "rx.h"
#include "cmd.h"
#include "acx.h"


static void wl1251_rx_header(struct wl1251 *wl, struct wl1251_rx_descriptor *desc) { u32 rx_packet_ring_addr; rx_packet_ring_addr = wl->data_path->rx_packet_ring_addr; if (wl->rx_current_buffer) rx_packet_ring_addr += wl->data_path->rx_packet_ring_chunk_size; wl1251_mem_read(wl, rx_packet_ring_addr, desc, sizeof(*desc)); }

Contributors

PersonTokensPropCommitsCommitProp
Kalle Valo5598.21%375.00%
Bob Copeland11.79%125.00%
Total56100.00%4100.00%


static void wl1251_rx_status(struct wl1251 *wl, struct wl1251_rx_descriptor *desc, struct ieee80211_rx_status *status, u8 beacon) { u64 mactime; int ret; memset(status, 0, sizeof(struct ieee80211_rx_status)); status->band = NL80211_BAND_2GHZ; status->mactime = desc->timestamp; /* * The rx status timestamp is a 32 bits value while the TSF is a * 64 bits one. * For IBSS merging, TSF is mandatory, so we have to get it * somehow, so we ask for ACX_TSF_INFO. * That could be moved to the get_tsf() hook, but unfortunately, * this one must be atomic, while our SPI routines can sleep. */ if ((wl->bss_type == BSS_TYPE_IBSS) && beacon) { ret = wl1251_acx_tsf_info(wl, &mactime); if (ret == 0) status->mactime = mactime; } status->signal = desc->rssi; /* * FIXME: guessing that snr needs to be divided by two, otherwise * the values don't make any sense */ wl->noise = desc->rssi - desc->snr / 2; status->freq = ieee80211_channel_to_frequency(desc->channel, status->band); status->flag |= RX_FLAG_MACTIME_START; if (!wl->monitor_present && (desc->flags & RX_DESC_ENCRYPTION_MASK)) { status->flag |= RX_FLAG_IV_STRIPPED | RX_FLAG_MMIC_STRIPPED; if (likely(!(desc->flags & RX_DESC_DECRYPT_FAIL))) status->flag |= RX_FLAG_DECRYPTED; if (unlikely(desc->flags & RX_DESC_MIC_FAIL)) status->flag |= RX_FLAG_MMIC_ERROR; } if (unlikely(!(desc->flags & RX_DESC_VALID_FCS))) status->flag |= RX_FLAG_FAILED_FCS_CRC; switch (desc->rate) { /* skip 1 and 12 Mbps because they have same value 0x0a */ case RATE_2MBPS: status->rate_idx = 1; break; case RATE_5_5MBPS: status->rate_idx = 2; break; case RATE_11MBPS: status->rate_idx = 3; break; case RATE_6MBPS: status->rate_idx = 4; break; case RATE_9MBPS: status->rate_idx = 5; break; case RATE_18MBPS: status->rate_idx = 7; break; case RATE_24MBPS: status->rate_idx = 8; break; case RATE_36MBPS: status->rate_idx = 9; break; case RATE_48MBPS: status->rate_idx = 10; break; case RATE_54MBPS: status->rate_idx = 11; break; } /* for 1 and 12 Mbps we have to check the modulation */ if (desc->rate == RATE_1MBPS) { if (!(desc->mod_pre & OFDM_RATE_BIT)) /* CCK -> RATE_1MBPS */ status->rate_idx = 0; else /* OFDM -> RATE_12MBPS */ status->rate_idx = 6; } if (desc->mod_pre & SHORT_PREAMBLE_BIT) status->flag |= RX_FLAG_SHORTPRE; }

Contributors

PersonTokensPropCommitsCommitProp
Kalle Valo19250.53%333.33%
David Gnedt16743.95%222.22%
John W. Linville153.95%111.11%
Bruno Randolf41.05%111.11%
Thomas Pedersen10.26%111.11%
Johannes Berg10.26%111.11%
Total380100.00%9100.00%


static void wl1251_rx_body(struct wl1251 *wl, struct wl1251_rx_descriptor *desc) { struct sk_buff *skb; struct ieee80211_rx_status status; u8 *rx_buffer, beacon = 0; u16 length, *fc; u32 curr_id, last_id_inc, rx_packet_ring_addr; length = WL1251_RX_ALIGN(desc->length - PLCP_HEADER_LENGTH); curr_id = (desc->flags & RX_DESC_SEQNUM_MASK) >> RX_DESC_PACKETID_SHIFT; last_id_inc = (wl->rx_last_id + 1) % (RX_MAX_PACKET_ID + 1); if (last_id_inc != curr_id) { wl1251_warning("curr ID:%d, last ID inc:%d", curr_id, last_id_inc); wl->rx_last_id = curr_id; } else { wl->rx_last_id = last_id_inc; } rx_packet_ring_addr = wl->data_path->rx_packet_ring_addr + sizeof(struct wl1251_rx_descriptor) + 20; if (wl->rx_current_buffer) rx_packet_ring_addr += wl->data_path->rx_packet_ring_chunk_size; skb = __dev_alloc_skb(length, GFP_KERNEL); if (!skb) { wl1251_error("Couldn't allocate RX frame"); return; } rx_buffer = skb_put(skb, length); wl1251_mem_read(wl, rx_packet_ring_addr, rx_buffer, length); /* The actual length doesn't include the target's alignment */ skb_trim(skb, desc->length - PLCP_HEADER_LENGTH); fc = (u16 *)skb->data; if ((*fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_BEACON) beacon = 1; wl1251_rx_status(wl, desc, &status, beacon); wl1251_debug(DEBUG_RX, "rx skb 0x%p: %d B %s", skb, skb->len, beacon ? "beacon" : ""); memcpy(IEEE80211_SKB_RXCB(skb), &status, sizeof(status)); ieee80211_rx_ni(wl->hw, skb); }

Contributors

PersonTokensPropCommitsCommitProp
Kalle Valo26092.20%450.00%
Johannes Berg165.67%112.50%
Ivaylo Dimitrov41.42%112.50%
Lucas De Marchi10.35%112.50%
Bob Copeland10.35%112.50%
Total282100.00%8100.00%


static void wl1251_rx_ack(struct wl1251 *wl) { u32 data, addr; if (wl->rx_current_buffer) { addr = ACX_REG_INTERRUPT_TRIG_H; data = INTR_TRIG_RX_PROC1; } else { addr = ACX_REG_INTERRUPT_TRIG; data = INTR_TRIG_RX_PROC0; } wl1251_reg_write32(wl, addr, data); /* Toggle buffer ring */ wl->rx_current_buffer = !wl->rx_current_buffer; }

Contributors

PersonTokensPropCommitsCommitProp
Kalle Valo62100.00%2100.00%
Total62100.00%2100.00%


void wl1251_rx(struct wl1251 *wl) { struct wl1251_rx_descriptor *rx_desc; if (wl->state != WL1251_STATE_ON) return; rx_desc = wl->rx_descriptor; /* We first read the frame's header */ wl1251_rx_header(wl, rx_desc); /* Now we can read the body */ wl1251_rx_body(wl, rx_desc); /* Finally, we need to ACK the RX */ wl1251_rx_ack(wl); }

Contributors

PersonTokensPropCommitsCommitProp
Kalle Valo52100.00%3100.00%
Total52100.00%3100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Kalle Valo64474.88%1047.62%
David Gnedt16719.42%29.52%
Johannes Berg171.98%29.52%
John W. Linville151.74%14.76%
Bob Copeland40.47%14.76%
Ivaylo Dimitrov40.47%14.76%
Bruno Randolf40.47%14.76%
Tejun Heo30.35%14.76%
Thomas Pedersen10.12%14.76%
Lucas De Marchi10.12%14.76%
Total860100.00%21100.00%
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