![Ivaylo Dimitrov](/assets/img/avatar_default.png)
the current code is directly setting skb->len, which is not correct and brings problems with HAVE_EFFICIENT_UNALIGNED_ACCESS enabled in config Signed-off-by: Ivaylo Dimitrov <ivo.g.dimitrov.75@gmail.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
236 lines
5.8 KiB
C
236 lines
5.8 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*
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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 = IEEE80211_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->flag |= RX_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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