mirror of https://gitee.com/openkylin/linux.git
285 lines
8.4 KiB
C
285 lines
8.4 KiB
C
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/*
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* Copyright (c) 2009 Atheros Communications Inc.
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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/*
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* Module for common driver code between ath9k and ath9k_htc
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include "common.h"
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MODULE_AUTHOR("Atheros Communications");
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MODULE_DESCRIPTION("Shared library for Atheros wireless 802.11n LAN cards.");
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MODULE_LICENSE("Dual BSD/GPL");
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/* Common RX processing */
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/* Assumes you've already done the endian to CPU conversion */
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static bool ath9k_rx_accept(struct ath_common *common,
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struct sk_buff *skb,
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struct ieee80211_rx_status *rxs,
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struct ath_rx_status *rx_stats,
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bool *decrypt_error)
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{
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struct ath_hw *ah = common->ah;
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struct ieee80211_hdr *hdr;
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__le16 fc;
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hdr = (struct ieee80211_hdr *) skb->data;
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fc = hdr->frame_control;
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if (!rx_stats->rs_datalen)
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return false;
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/*
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* rs_status follows rs_datalen so if rs_datalen is too large
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* we can take a hint that hardware corrupted it, so ignore
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* those frames.
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*/
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if (rx_stats->rs_datalen > common->rx_bufsize)
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return false;
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if (rx_stats->rs_more) {
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/*
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* Frame spans multiple descriptors; this cannot happen yet
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* as we don't support jumbograms. If not in monitor mode,
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* discard the frame. Enable this if you want to see
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* error frames in Monitor mode.
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*/
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if (ah->opmode != NL80211_IFTYPE_MONITOR)
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return false;
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} else if (rx_stats->rs_status != 0) {
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if (rx_stats->rs_status & ATH9K_RXERR_CRC)
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rxs->flag |= RX_FLAG_FAILED_FCS_CRC;
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if (rx_stats->rs_status & ATH9K_RXERR_PHY)
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return false;
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if (rx_stats->rs_status & ATH9K_RXERR_DECRYPT) {
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*decrypt_error = true;
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} else if (rx_stats->rs_status & ATH9K_RXERR_MIC) {
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if (ieee80211_is_ctl(fc))
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/*
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* Sometimes, we get invalid
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* MIC failures on valid control frames.
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* Remove these mic errors.
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*/
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rx_stats->rs_status &= ~ATH9K_RXERR_MIC;
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else
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rxs->flag |= RX_FLAG_MMIC_ERROR;
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}
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/*
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* Reject error frames with the exception of
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* decryption and MIC failures. For monitor mode,
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* we also ignore the CRC error.
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*/
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if (ah->opmode == NL80211_IFTYPE_MONITOR) {
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if (rx_stats->rs_status &
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~(ATH9K_RXERR_DECRYPT | ATH9K_RXERR_MIC |
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ATH9K_RXERR_CRC))
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return false;
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} else {
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if (rx_stats->rs_status &
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~(ATH9K_RXERR_DECRYPT | ATH9K_RXERR_MIC)) {
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return false;
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}
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}
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}
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return true;
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}
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static u8 ath9k_process_rate(struct ath_common *common,
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struct ieee80211_hw *hw,
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struct ath_rx_status *rx_stats,
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struct ieee80211_rx_status *rxs,
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struct sk_buff *skb)
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{
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struct ieee80211_supported_band *sband;
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enum ieee80211_band band;
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unsigned int i = 0;
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band = hw->conf.channel->band;
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sband = hw->wiphy->bands[band];
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if (rx_stats->rs_rate & 0x80) {
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/* HT rate */
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rxs->flag |= RX_FLAG_HT;
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if (rx_stats->rs_flags & ATH9K_RX_2040)
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rxs->flag |= RX_FLAG_40MHZ;
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if (rx_stats->rs_flags & ATH9K_RX_GI)
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rxs->flag |= RX_FLAG_SHORT_GI;
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return rx_stats->rs_rate & 0x7f;
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}
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for (i = 0; i < sband->n_bitrates; i++) {
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if (sband->bitrates[i].hw_value == rx_stats->rs_rate)
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return i;
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if (sband->bitrates[i].hw_value_short == rx_stats->rs_rate) {
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rxs->flag |= RX_FLAG_SHORTPRE;
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return i;
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}
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}
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/* No valid hardware bitrate found -- we should not get here */
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ath_print(common, ATH_DBG_XMIT, "unsupported hw bitrate detected "
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"0x%02x using 1 Mbit\n", rx_stats->rs_rate);
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if ((common->debug_mask & ATH_DBG_XMIT))
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print_hex_dump_bytes("", DUMP_PREFIX_NONE, skb->data, skb->len);
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return 0;
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}
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static void ath9k_process_rssi(struct ath_common *common,
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struct ieee80211_hw *hw,
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struct sk_buff *skb,
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struct ath_rx_status *rx_stats)
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{
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struct ath_hw *ah = common->ah;
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struct ieee80211_sta *sta;
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struct ieee80211_hdr *hdr;
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struct ath_node *an;
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int last_rssi = ATH_RSSI_DUMMY_MARKER;
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__le16 fc;
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hdr = (struct ieee80211_hdr *)skb->data;
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fc = hdr->frame_control;
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rcu_read_lock();
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/*
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* XXX: use ieee80211_find_sta! This requires quite a bit of work
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* under the current ath9k virtual wiphy implementation as we have
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* no way of tying a vif to wiphy. Typically vifs are attached to
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* at least one sdata of a wiphy on mac80211 but with ath9k virtual
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* wiphy you'd have to iterate over every wiphy and each sdata.
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*/
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sta = ieee80211_find_sta_by_hw(hw, hdr->addr2);
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if (sta) {
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an = (struct ath_node *) sta->drv_priv;
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if (rx_stats->rs_rssi != ATH9K_RSSI_BAD &&
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!rx_stats->rs_moreaggr)
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ATH_RSSI_LPF(an->last_rssi, rx_stats->rs_rssi);
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last_rssi = an->last_rssi;
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}
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rcu_read_unlock();
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if (likely(last_rssi != ATH_RSSI_DUMMY_MARKER))
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rx_stats->rs_rssi = ATH_EP_RND(last_rssi,
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ATH_RSSI_EP_MULTIPLIER);
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if (rx_stats->rs_rssi < 0)
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rx_stats->rs_rssi = 0;
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else if (rx_stats->rs_rssi > 127)
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rx_stats->rs_rssi = 127;
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/* Update Beacon RSSI, this is used by ANI. */
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if (ieee80211_is_beacon(fc))
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ah->stats.avgbrssi = rx_stats->rs_rssi;
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}
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/*
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* For Decrypt or Demic errors, we only mark packet status here and always push
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* up the frame up to let mac80211 handle the actual error case, be it no
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* decryption key or real decryption error. This let us keep statistics there.
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*/
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int ath9k_cmn_rx_skb_preprocess(struct ath_common *common,
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struct ieee80211_hw *hw,
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struct sk_buff *skb,
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struct ath_rx_status *rx_stats,
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struct ieee80211_rx_status *rx_status,
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bool *decrypt_error)
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{
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struct ath_hw *ah = common->ah;
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if (!ath9k_rx_accept(common, skb, rx_status, rx_stats, decrypt_error))
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return -EINVAL;
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ath9k_process_rssi(common, hw, skb, rx_stats);
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rx_status->rate_idx = ath9k_process_rate(common, hw,
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rx_stats, rx_status, skb);
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rx_status->mactime = ath9k_hw_extend_tsf(ah, rx_stats->rs_tstamp);
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rx_status->band = hw->conf.channel->band;
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rx_status->freq = hw->conf.channel->center_freq;
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rx_status->noise = common->ani.noise_floor;
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rx_status->signal = ATH_DEFAULT_NOISE_FLOOR + rx_stats->rs_rssi;
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rx_status->antenna = rx_stats->rs_antenna;
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rx_status->flag |= RX_FLAG_TSFT;
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return 0;
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}
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EXPORT_SYMBOL(ath9k_cmn_rx_skb_preprocess);
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void ath9k_cmn_rx_skb_postprocess(struct ath_common *common,
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struct sk_buff *skb,
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struct ath_rx_status *rx_stats,
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struct ieee80211_rx_status *rxs,
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bool decrypt_error)
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{
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struct ath_hw *ah = common->ah;
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struct ieee80211_hdr *hdr;
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int hdrlen, padsize;
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u8 keyix;
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__le16 fc;
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/* see if any padding is done by the hw and remove it */
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hdr = (struct ieee80211_hdr *) skb->data;
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hdrlen = ieee80211_get_hdrlen_from_skb(skb);
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fc = hdr->frame_control;
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/* The MAC header is padded to have 32-bit boundary if the
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* packet payload is non-zero. The general calculation for
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* padsize would take into account odd header lengths:
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* padsize = (4 - hdrlen % 4) % 4; However, since only
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* even-length headers are used, padding can only be 0 or 2
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* bytes and we can optimize this a bit. In addition, we must
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* not try to remove padding from short control frames that do
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* not have payload. */
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padsize = hdrlen & 3;
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if (padsize && hdrlen >= 24) {
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memmove(skb->data + padsize, skb->data, hdrlen);
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skb_pull(skb, padsize);
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}
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keyix = rx_stats->rs_keyix;
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if (!(keyix == ATH9K_RXKEYIX_INVALID) && !decrypt_error) {
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rxs->flag |= RX_FLAG_DECRYPTED;
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} else if (ieee80211_has_protected(fc)
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&& !decrypt_error && skb->len >= hdrlen + 4) {
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keyix = skb->data[hdrlen + 3] >> 6;
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if (test_bit(keyix, common->keymap))
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rxs->flag |= RX_FLAG_DECRYPTED;
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}
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if (ah->sw_mgmt_crypto &&
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(rxs->flag & RX_FLAG_DECRYPTED) &&
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ieee80211_is_mgmt(fc))
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/* Use software decrypt for management frames. */
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rxs->flag &= ~RX_FLAG_DECRYPTED;
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}
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EXPORT_SYMBOL(ath9k_cmn_rx_skb_postprocess);
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static int __init ath9k_cmn_init(void)
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{
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return 0;
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}
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module_init(ath9k_cmn_init);
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static void __exit ath9k_cmn_exit(void)
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{
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return;
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}
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module_exit(ath9k_cmn_exit);
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