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@@ -27,6 +27,7 @@
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*
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*****************************************************************************/
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+#include <linux/etherdevice.h>
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#include <net/mac80211.h>
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#include "iwl-eeprom.h"
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#include "iwl-dev.h"
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@@ -541,3 +542,855 @@ void iwl_rx_statistics(struct iwl_priv *priv,
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priv->cfg->ops->lib->temperature(priv, &pkt->u.stats);
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}
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EXPORT_SYMBOL(iwl_rx_statistics);
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+
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+#define PERFECT_RSSI (-20) /* dBm */
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+#define WORST_RSSI (-95) /* dBm */
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+#define RSSI_RANGE (PERFECT_RSSI - WORST_RSSI)
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+
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+/* Calculate an indication of rx signal quality (a percentage, not dBm!).
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+ * See http://www.ces.clemson.edu/linux/signal_quality.shtml for info
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+ * about formulas used below. */
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+static int iwl_calc_sig_qual(int rssi_dbm, int noise_dbm)
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+{
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+ int sig_qual;
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+ int degradation = PERFECT_RSSI - rssi_dbm;
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+
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+ /* If we get a noise measurement, use signal-to-noise ratio (SNR)
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+ * as indicator; formula is (signal dbm - noise dbm).
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+ * SNR at or above 40 is a great signal (100%).
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+ * Below that, scale to fit SNR of 0 - 40 dB within 0 - 100% indicator.
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+ * Weakest usable signal is usually 10 - 15 dB SNR. */
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+ if (noise_dbm) {
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+ if (rssi_dbm - noise_dbm >= 40)
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+ return 100;
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+ else if (rssi_dbm < noise_dbm)
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+ return 0;
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+ sig_qual = ((rssi_dbm - noise_dbm) * 5) / 2;
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+
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+ /* Else use just the signal level.
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+ * This formula is a least squares fit of data points collected and
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+ * compared with a reference system that had a percentage (%) display
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+ * for signal quality. */
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+ } else
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+ sig_qual = (100 * (RSSI_RANGE * RSSI_RANGE) - degradation *
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+ (15 * RSSI_RANGE + 62 * degradation)) /
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+ (RSSI_RANGE * RSSI_RANGE);
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+
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+ if (sig_qual > 100)
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+ sig_qual = 100;
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+ else if (sig_qual < 1)
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+ sig_qual = 0;
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+
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+ return sig_qual;
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+}
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+
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+#ifdef CONFIG_IWLWIFI_DEBUG
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+
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+/**
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+ * iwl_dbg_report_frame - dump frame to syslog during debug sessions
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+ *
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+ * You may hack this function to show different aspects of received frames,
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+ * including selective frame dumps.
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+ * group100 parameter selects whether to show 1 out of 100 good frames.
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+ *
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+ * TODO: This was originally written for 3945, need to audit for
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+ * proper operation with 4965.
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+ */
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+static void iwl_dbg_report_frame(struct iwl_priv *priv,
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+ struct iwl_rx_packet *pkt,
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+ struct ieee80211_hdr *header, int group100)
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+{
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+ u32 to_us;
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+ u32 print_summary = 0;
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+ u32 print_dump = 0; /* set to 1 to dump all frames' contents */
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+ u32 hundred = 0;
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+ u32 dataframe = 0;
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+ __le16 fc;
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+ u16 seq_ctl;
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+ u16 channel;
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+ u16 phy_flags;
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+ int rate_sym;
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+ u16 length;
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+ u16 status;
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+ u16 bcn_tmr;
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+ u32 tsf_low;
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+ u64 tsf;
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+ u8 rssi;
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+ u8 agc;
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+ u16 sig_avg;
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+ u16 noise_diff;
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+ struct iwl4965_rx_frame_stats *rx_stats = IWL_RX_STATS(pkt);
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+ struct iwl4965_rx_frame_hdr *rx_hdr = IWL_RX_HDR(pkt);
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+ struct iwl4965_rx_frame_end *rx_end = IWL_RX_END(pkt);
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+ u8 *data = IWL_RX_DATA(pkt);
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+
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+ if (likely(!(priv->debug_level & IWL_DL_RX)))
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+ return;
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+
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+ /* MAC header */
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+ fc = header->frame_control;
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+ seq_ctl = le16_to_cpu(header->seq_ctrl);
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+
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+ /* metadata */
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+ channel = le16_to_cpu(rx_hdr->channel);
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+ phy_flags = le16_to_cpu(rx_hdr->phy_flags);
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+ rate_sym = rx_hdr->rate;
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+ length = le16_to_cpu(rx_hdr->len);
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+
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+ /* end-of-frame status and timestamp */
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+ status = le32_to_cpu(rx_end->status);
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+ bcn_tmr = le32_to_cpu(rx_end->beacon_timestamp);
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+ tsf_low = le64_to_cpu(rx_end->timestamp) & 0x0ffffffff;
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+ tsf = le64_to_cpu(rx_end->timestamp);
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+
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+ /* signal statistics */
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+ rssi = rx_stats->rssi;
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+ agc = rx_stats->agc;
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+ sig_avg = le16_to_cpu(rx_stats->sig_avg);
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+ noise_diff = le16_to_cpu(rx_stats->noise_diff);
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+
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+ to_us = !compare_ether_addr(header->addr1, priv->mac_addr);
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+
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+ /* if data frame is to us and all is good,
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+ * (optionally) print summary for only 1 out of every 100 */
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+ if (to_us && (fc & ~cpu_to_le16(IEEE80211_FCTL_PROTECTED)) ==
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+ cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FTYPE_DATA)) {
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+ dataframe = 1;
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+ if (!group100)
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+ print_summary = 1; /* print each frame */
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+ else if (priv->framecnt_to_us < 100) {
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+ priv->framecnt_to_us++;
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+ print_summary = 0;
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+ } else {
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+ priv->framecnt_to_us = 0;
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+ print_summary = 1;
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+ hundred = 1;
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+ }
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+ } else {
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+ /* print summary for all other frames */
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+ print_summary = 1;
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+ }
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+
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+ if (print_summary) {
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+ char *title;
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+ int rate_idx;
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+ u32 bitrate;
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+
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+ if (hundred)
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+ title = "100Frames";
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+ else if (ieee80211_has_retry(fc))
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+ title = "Retry";
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+ else if (ieee80211_is_assoc_resp(fc))
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+ title = "AscRsp";
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+ else if (ieee80211_is_reassoc_resp(fc))
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+ title = "RasRsp";
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+ else if (ieee80211_is_probe_resp(fc)) {
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+ title = "PrbRsp";
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+ print_dump = 1; /* dump frame contents */
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+ } else if (ieee80211_is_beacon(fc)) {
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+ title = "Beacon";
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+ print_dump = 1; /* dump frame contents */
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+ } else if (ieee80211_is_atim(fc))
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+ title = "ATIM";
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+ else if (ieee80211_is_auth(fc))
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+ title = "Auth";
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+ else if (ieee80211_is_deauth(fc))
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+ title = "DeAuth";
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+ else if (ieee80211_is_disassoc(fc))
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+ title = "DisAssoc";
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+ else
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+ title = "Frame";
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+
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+ rate_idx = iwl_hwrate_to_plcp_idx(rate_sym);
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+ if (unlikely(rate_idx == -1))
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+ bitrate = 0;
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+ else
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+ bitrate = iwl_rates[rate_idx].ieee / 2;
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+
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+ /* print frame summary.
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+ * MAC addresses show just the last byte (for brevity),
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+ * but you can hack it to show more, if you'd like to. */
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+ if (dataframe)
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+ IWL_DEBUG_RX("%s: mhd=0x%04x, dst=0x%02x, "
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+ "len=%u, rssi=%d, chnl=%d, rate=%u, \n",
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+ title, le16_to_cpu(fc), header->addr1[5],
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+ length, rssi, channel, bitrate);
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+ else {
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+ /* src/dst addresses assume managed mode */
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+ IWL_DEBUG_RX("%s: 0x%04x, dst=0x%02x, "
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+ "src=0x%02x, rssi=%u, tim=%lu usec, "
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+ "phy=0x%02x, chnl=%d\n",
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+ title, le16_to_cpu(fc), header->addr1[5],
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+ header->addr3[5], rssi,
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+ tsf_low - priv->scan_start_tsf,
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+ phy_flags, channel);
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+ }
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+ }
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+ if (print_dump)
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+ iwl_print_hex_dump(priv, IWL_DL_RX, data, length);
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+}
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+#else
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+static inline void iwl_dbg_report_frame(struct iwl_priv *priv,
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+ struct iwl_rx_packet *pkt,
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+ struct ieee80211_hdr *header,
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+ int group100)
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+{
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+}
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+#endif
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+
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+static void iwl_add_radiotap(struct iwl_priv *priv,
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+ struct sk_buff *skb,
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+ struct iwl4965_rx_phy_res *rx_start,
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+ struct ieee80211_rx_status *stats,
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+ u32 ampdu_status)
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+{
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+ s8 signal = stats->signal;
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+ s8 noise = 0;
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+ int rate = stats->rate_idx;
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+ u64 tsf = stats->mactime;
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+ __le16 antenna;
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+ __le16 phy_flags_hw = rx_start->phy_flags;
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+ struct iwl4965_rt_rx_hdr {
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+ struct ieee80211_radiotap_header rt_hdr;
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+ __le64 rt_tsf; /* TSF */
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+ u8 rt_flags; /* radiotap packet flags */
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+ u8 rt_rate; /* rate in 500kb/s */
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+ __le16 rt_channelMHz; /* channel in MHz */
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+ __le16 rt_chbitmask; /* channel bitfield */
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+ s8 rt_dbmsignal; /* signal in dBm, kluged to signed */
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+ s8 rt_dbmnoise;
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+ u8 rt_antenna; /* antenna number */
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+ } __attribute__ ((packed)) *iwl4965_rt;
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+
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+ /* TODO: We won't have enough headroom for HT frames. Fix it later. */
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+ if (skb_headroom(skb) < sizeof(*iwl4965_rt)) {
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+ if (net_ratelimit())
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+ printk(KERN_ERR "not enough headroom [%d] for "
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+ "radiotap head [%zd]\n",
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+ skb_headroom(skb), sizeof(*iwl4965_rt));
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+ return;
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+ }
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+
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+ /* put radiotap header in front of 802.11 header and data */
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+ iwl4965_rt = (void *)skb_push(skb, sizeof(*iwl4965_rt));
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+
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+ /* initialise radiotap header */
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+ iwl4965_rt->rt_hdr.it_version = PKTHDR_RADIOTAP_VERSION;
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+ iwl4965_rt->rt_hdr.it_pad = 0;
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+
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+ /* total header + data */
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+ put_unaligned(cpu_to_le16(sizeof(*iwl4965_rt)),
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+ &iwl4965_rt->rt_hdr.it_len);
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+
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+ /* Indicate all the fields we add to the radiotap header */
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+ put_unaligned(cpu_to_le32((1 << IEEE80211_RADIOTAP_TSFT) |
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+ (1 << IEEE80211_RADIOTAP_FLAGS) |
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+ (1 << IEEE80211_RADIOTAP_RATE) |
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+ (1 << IEEE80211_RADIOTAP_CHANNEL) |
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+ (1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL) |
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+ (1 << IEEE80211_RADIOTAP_DBM_ANTNOISE) |
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+ (1 << IEEE80211_RADIOTAP_ANTENNA)),
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+ &iwl4965_rt->rt_hdr.it_present);
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+
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+ /* Zero the flags, we'll add to them as we go */
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+ iwl4965_rt->rt_flags = 0;
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+
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+ put_unaligned(cpu_to_le64(tsf), &iwl4965_rt->rt_tsf);
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+
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+ iwl4965_rt->rt_dbmsignal = signal;
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+ iwl4965_rt->rt_dbmnoise = noise;
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+
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+ /* Convert the channel frequency and set the flags */
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+ put_unaligned(cpu_to_le16(stats->freq), &iwl4965_rt->rt_channelMHz);
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+ if (!(phy_flags_hw & RX_RES_PHY_FLAGS_BAND_24_MSK))
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+ put_unaligned(cpu_to_le16(IEEE80211_CHAN_OFDM |
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+ IEEE80211_CHAN_5GHZ),
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+ &iwl4965_rt->rt_chbitmask);
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+ else if (phy_flags_hw & RX_RES_PHY_FLAGS_MOD_CCK_MSK)
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+ put_unaligned(cpu_to_le16(IEEE80211_CHAN_CCK |
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+ IEEE80211_CHAN_2GHZ),
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+ &iwl4965_rt->rt_chbitmask);
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+ else /* 802.11g */
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+ put_unaligned(cpu_to_le16(IEEE80211_CHAN_OFDM |
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+ IEEE80211_CHAN_2GHZ),
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+ &iwl4965_rt->rt_chbitmask);
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+
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+ if (rate == -1)
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+ iwl4965_rt->rt_rate = 0;
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+ else
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+ iwl4965_rt->rt_rate = iwl_rates[rate].ieee;
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+
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+ /*
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+ * "antenna number"
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+ *
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+ * It seems that the antenna field in the phy flags value
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+ * is actually a bitfield. This is undefined by radiotap,
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+ * it wants an actual antenna number but I always get "7"
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+ * for most legacy frames I receive indicating that the
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+ * same frame was received on all three RX chains.
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+ *
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+ * I think this field should be removed in favour of a
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+ * new 802.11n radiotap field "RX chains" that is defined
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+ * as a bitmask.
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+ */
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+ antenna = phy_flags_hw & RX_RES_PHY_FLAGS_ANTENNA_MSK;
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+ iwl4965_rt->rt_antenna = le16_to_cpu(antenna) >> 4;
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+
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+ /* set the preamble flag if appropriate */
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+ if (phy_flags_hw & RX_RES_PHY_FLAGS_SHORT_PREAMBLE_MSK)
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+ iwl4965_rt->rt_flags |= IEEE80211_RADIOTAP_F_SHORTPRE;
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+
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+ stats->flag |= RX_FLAG_RADIOTAP;
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+}
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+
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+static void iwl_update_rx_stats(struct iwl_priv *priv, u16 fc, u16 len)
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+{
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+ /* 0 - mgmt, 1 - cnt, 2 - data */
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+ int idx = (fc & IEEE80211_FCTL_FTYPE) >> 2;
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+ priv->rx_stats[idx].cnt++;
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+ priv->rx_stats[idx].bytes += len;
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+}
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+
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+/*
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+ * returns non-zero if packet should be dropped
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+ */
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+static int iwl_set_decrypted_flag(struct iwl_priv *priv,
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+ struct ieee80211_hdr *hdr,
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+ u32 decrypt_res,
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+ struct ieee80211_rx_status *stats)
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+{
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+ u16 fc = le16_to_cpu(hdr->frame_control);
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+
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+ if (priv->active_rxon.filter_flags & RXON_FILTER_DIS_DECRYPT_MSK)
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+ return 0;
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+
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+ if (!(fc & IEEE80211_FCTL_PROTECTED))
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+ return 0;
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+
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+ IWL_DEBUG_RX("decrypt_res:0x%x\n", decrypt_res);
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+ switch (decrypt_res & RX_RES_STATUS_SEC_TYPE_MSK) {
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+ case RX_RES_STATUS_SEC_TYPE_TKIP:
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+ /* The uCode has got a bad phase 1 Key, pushes the packet.
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+ * Decryption will be done in SW. */
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+ if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
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+ RX_RES_STATUS_BAD_KEY_TTAK)
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+ break;
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+
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+ case RX_RES_STATUS_SEC_TYPE_WEP:
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+ if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
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+ RX_RES_STATUS_BAD_ICV_MIC) {
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+ /* bad ICV, the packet is destroyed since the
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+ * decryption is inplace, drop it */
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+ IWL_DEBUG_RX("Packet destroyed\n");
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+ return -1;
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+ }
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+ case RX_RES_STATUS_SEC_TYPE_CCMP:
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+ if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
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+ RX_RES_STATUS_DECRYPT_OK) {
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+ IWL_DEBUG_RX("hw decrypt successfully!!!\n");
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+ stats->flag |= RX_FLAG_DECRYPTED;
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+ }
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+ break;
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+
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+ default:
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+ break;
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+ }
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+ return 0;
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+}
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+
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+static u32 iwl_translate_rx_status(struct iwl_priv *priv, u32 decrypt_in)
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+{
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|
+ u32 decrypt_out = 0;
|
|
|
+
|
|
|
+ if ((decrypt_in & RX_RES_STATUS_STATION_FOUND) ==
|
|
|
+ RX_RES_STATUS_STATION_FOUND)
|
|
|
+ decrypt_out |= (RX_RES_STATUS_STATION_FOUND |
|
|
|
+ RX_RES_STATUS_NO_STATION_INFO_MISMATCH);
|
|
|
+
|
|
|
+ decrypt_out |= (decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK);
|
|
|
+
|
|
|
+ /* packet was not encrypted */
|
|
|
+ if ((decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) ==
|
|
|
+ RX_RES_STATUS_SEC_TYPE_NONE)
|
|
|
+ return decrypt_out;
|
|
|
+
|
|
|
+ /* packet was encrypted with unknown alg */
|
|
|
+ if ((decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) ==
|
|
|
+ RX_RES_STATUS_SEC_TYPE_ERR)
|
|
|
+ return decrypt_out;
|
|
|
+
|
|
|
+ /* decryption was not done in HW */
|
|
|
+ if ((decrypt_in & RX_MPDU_RES_STATUS_DEC_DONE_MSK) !=
|
|
|
+ RX_MPDU_RES_STATUS_DEC_DONE_MSK)
|
|
|
+ return decrypt_out;
|
|
|
+
|
|
|
+ switch (decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) {
|
|
|
+
|
|
|
+ case RX_RES_STATUS_SEC_TYPE_CCMP:
|
|
|
+ /* alg is CCM: check MIC only */
|
|
|
+ if (!(decrypt_in & RX_MPDU_RES_STATUS_MIC_OK))
|
|
|
+ /* Bad MIC */
|
|
|
+ decrypt_out |= RX_RES_STATUS_BAD_ICV_MIC;
|
|
|
+ else
|
|
|
+ decrypt_out |= RX_RES_STATUS_DECRYPT_OK;
|
|
|
+
|
|
|
+ break;
|
|
|
+
|
|
|
+ case RX_RES_STATUS_SEC_TYPE_TKIP:
|
|
|
+ if (!(decrypt_in & RX_MPDU_RES_STATUS_TTAK_OK)) {
|
|
|
+ /* Bad TTAK */
|
|
|
+ decrypt_out |= RX_RES_STATUS_BAD_KEY_TTAK;
|
|
|
+ break;
|
|
|
+ }
|
|
|
+ /* fall through if TTAK OK */
|
|
|
+ default:
|
|
|
+ if (!(decrypt_in & RX_MPDU_RES_STATUS_ICV_OK))
|
|
|
+ decrypt_out |= RX_RES_STATUS_BAD_ICV_MIC;
|
|
|
+ else
|
|
|
+ decrypt_out |= RX_RES_STATUS_DECRYPT_OK;
|
|
|
+ break;
|
|
|
+ };
|
|
|
+
|
|
|
+ IWL_DEBUG_RX("decrypt_in:0x%x decrypt_out = 0x%x\n",
|
|
|
+ decrypt_in, decrypt_out);
|
|
|
+
|
|
|
+ return decrypt_out;
|
|
|
+}
|
|
|
+
|
|
|
+static void iwl_handle_data_packet(struct iwl_priv *priv, int is_data,
|
|
|
+ int include_phy,
|
|
|
+ struct iwl_rx_mem_buffer *rxb,
|
|
|
+ struct ieee80211_rx_status *stats)
|
|
|
+{
|
|
|
+ struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data;
|
|
|
+ struct iwl4965_rx_phy_res *rx_start = (include_phy) ?
|
|
|
+ (struct iwl4965_rx_phy_res *)&(pkt->u.raw[0]) : NULL;
|
|
|
+ struct ieee80211_hdr *hdr;
|
|
|
+ u16 len;
|
|
|
+ __le32 *rx_end;
|
|
|
+ unsigned int skblen;
|
|
|
+ u32 ampdu_status;
|
|
|
+ u32 ampdu_status_legacy;
|
|
|
+
|
|
|
+ if (!include_phy && priv->last_phy_res[0])
|
|
|
+ rx_start = (struct iwl4965_rx_phy_res *)&priv->last_phy_res[1];
|
|
|
+
|
|
|
+ if (!rx_start) {
|
|
|
+ IWL_ERROR("MPDU frame without a PHY data\n");
|
|
|
+ return;
|
|
|
+ }
|
|
|
+ if (include_phy) {
|
|
|
+ hdr = (struct ieee80211_hdr *)((u8 *) &rx_start[1] +
|
|
|
+ rx_start->cfg_phy_cnt);
|
|
|
+
|
|
|
+ len = le16_to_cpu(rx_start->byte_count);
|
|
|
+
|
|
|
+ rx_end = (__le32 *) ((u8 *) &pkt->u.raw[0] +
|
|
|
+ sizeof(struct iwl4965_rx_phy_res) +
|
|
|
+ rx_start->cfg_phy_cnt + len);
|
|
|
+
|
|
|
+ } else {
|
|
|
+ struct iwl4965_rx_mpdu_res_start *amsdu =
|
|
|
+ (struct iwl4965_rx_mpdu_res_start *)pkt->u.raw;
|
|
|
+
|
|
|
+ hdr = (struct ieee80211_hdr *)(pkt->u.raw +
|
|
|
+ sizeof(struct iwl4965_rx_mpdu_res_start));
|
|
|
+ len = le16_to_cpu(amsdu->byte_count);
|
|
|
+ rx_start->byte_count = amsdu->byte_count;
|
|
|
+ rx_end = (__le32 *) (((u8 *) hdr) + len);
|
|
|
+ }
|
|
|
+ /* In monitor mode allow 802.11 ACk frames (10 bytes) */
|
|
|
+ if (len > priv->hw_params.max_pkt_size ||
|
|
|
+ len < ((priv->iw_mode == IEEE80211_IF_TYPE_MNTR) ? 10 : 16)) {
|
|
|
+ IWL_WARNING("byte count out of range [16,4K] : %d\n", len);
|
|
|
+ return;
|
|
|
+ }
|
|
|
+
|
|
|
+ ampdu_status = le32_to_cpu(*rx_end);
|
|
|
+ skblen = ((u8 *) rx_end - (u8 *) &pkt->u.raw[0]) + sizeof(u32);
|
|
|
+
|
|
|
+ if (!include_phy) {
|
|
|
+ /* New status scheme, need to translate */
|
|
|
+ ampdu_status_legacy = ampdu_status;
|
|
|
+ ampdu_status = iwl_translate_rx_status(priv, ampdu_status);
|
|
|
+ }
|
|
|
+
|
|
|
+ /* start from MAC */
|
|
|
+ skb_reserve(rxb->skb, (void *)hdr - (void *)pkt);
|
|
|
+ skb_put(rxb->skb, len); /* end where data ends */
|
|
|
+
|
|
|
+ /* We only process data packets if the interface is open */
|
|
|
+ if (unlikely(!priv->is_open)) {
|
|
|
+ IWL_DEBUG_DROP_LIMIT
|
|
|
+ ("Dropping packet while interface is not open.\n");
|
|
|
+ return;
|
|
|
+ }
|
|
|
+
|
|
|
+ stats->flag = 0;
|
|
|
+ hdr = (struct ieee80211_hdr *)rxb->skb->data;
|
|
|
+
|
|
|
+ /* in case of HW accelerated crypto and bad decryption, drop */
|
|
|
+ if (!priv->hw_params.sw_crypto &&
|
|
|
+ iwl_set_decrypted_flag(priv, hdr, ampdu_status, stats))
|
|
|
+ return;
|
|
|
+
|
|
|
+ if (priv->add_radiotap)
|
|
|
+ iwl_add_radiotap(priv, rxb->skb, rx_start, stats, ampdu_status);
|
|
|
+
|
|
|
+ iwl_update_rx_stats(priv, le16_to_cpu(hdr->frame_control), len);
|
|
|
+ ieee80211_rx_irqsafe(priv->hw, rxb->skb, stats);
|
|
|
+ priv->alloc_rxb_skb--;
|
|
|
+ rxb->skb = NULL;
|
|
|
+}
|
|
|
+
|
|
|
+/* Calc max signal level (dBm) among 3 possible receivers */
|
|
|
+static int iwl_calc_rssi(struct iwl_priv *priv,
|
|
|
+ struct iwl4965_rx_phy_res *rx_resp)
|
|
|
+{
|
|
|
+ /* data from PHY/DSP regarding signal strength, etc.,
|
|
|
+ * contents are always there, not configurable by host. */
|
|
|
+ struct iwl4965_rx_non_cfg_phy *ncphy =
|
|
|
+ (struct iwl4965_rx_non_cfg_phy *)rx_resp->non_cfg_phy;
|
|
|
+ u32 agc = (le16_to_cpu(ncphy->agc_info) & IWL_AGC_DB_MASK)
|
|
|
+ >> IWL_AGC_DB_POS;
|
|
|
+
|
|
|
+ u32 valid_antennae =
|
|
|
+ (le16_to_cpu(rx_resp->phy_flags) & RX_PHY_FLAGS_ANTENNAE_MASK)
|
|
|
+ >> RX_PHY_FLAGS_ANTENNAE_OFFSET;
|
|
|
+ u8 max_rssi = 0;
|
|
|
+ u32 i;
|
|
|
+
|
|
|
+ /* Find max rssi among 3 possible receivers.
|
|
|
+ * These values are measured by the digital signal processor (DSP).
|
|
|
+ * They should stay fairly constant even as the signal strength varies,
|
|
|
+ * if the radio's automatic gain control (AGC) is working right.
|
|
|
+ * AGC value (see below) will provide the "interesting" info. */
|
|
|
+ for (i = 0; i < 3; i++)
|
|
|
+ if (valid_antennae & (1 << i))
|
|
|
+ max_rssi = max(ncphy->rssi_info[i << 1], max_rssi);
|
|
|
+
|
|
|
+ IWL_DEBUG_STATS("Rssi In A %d B %d C %d Max %d AGC dB %d\n",
|
|
|
+ ncphy->rssi_info[0], ncphy->rssi_info[2], ncphy->rssi_info[4],
|
|
|
+ max_rssi, agc);
|
|
|
+
|
|
|
+ /* dBm = max_rssi dB - agc dB - constant.
|
|
|
+ * Higher AGC (higher radio gain) means lower signal. */
|
|
|
+ return max_rssi - agc - IWL_RSSI_OFFSET;
|
|
|
+}
|
|
|
+
|
|
|
+static void iwl_sta_modify_ps_wake(struct iwl_priv *priv, int sta_id)
|
|
|
+{
|
|
|
+ unsigned long flags;
|
|
|
+
|
|
|
+ spin_lock_irqsave(&priv->sta_lock, flags);
|
|
|
+ priv->stations[sta_id].sta.station_flags &= ~STA_FLG_PWR_SAVE_MSK;
|
|
|
+ priv->stations[sta_id].sta.station_flags_msk = STA_FLG_PWR_SAVE_MSK;
|
|
|
+ priv->stations[sta_id].sta.sta.modify_mask = 0;
|
|
|
+ priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
|
|
|
+ spin_unlock_irqrestore(&priv->sta_lock, flags);
|
|
|
+
|
|
|
+ iwl_send_add_sta(priv, &priv->stations[sta_id].sta, CMD_ASYNC);
|
|
|
+}
|
|
|
+
|
|
|
+static void iwl_update_ps_mode(struct iwl_priv *priv, u16 ps_bit, u8 *addr)
|
|
|
+{
|
|
|
+ /* FIXME: need locking over ps_status ??? */
|
|
|
+ u8 sta_id = iwl_find_station(priv, addr);
|
|
|
+
|
|
|
+ if (sta_id != IWL_INVALID_STATION) {
|
|
|
+ u8 sta_awake = priv->stations[sta_id].
|
|
|
+ ps_status == STA_PS_STATUS_WAKE;
|
|
|
+
|
|
|
+ if (sta_awake && ps_bit)
|
|
|
+ priv->stations[sta_id].ps_status = STA_PS_STATUS_SLEEP;
|
|
|
+ else if (!sta_awake && !ps_bit) {
|
|
|
+ iwl_sta_modify_ps_wake(priv, sta_id);
|
|
|
+ priv->stations[sta_id].ps_status = STA_PS_STATUS_WAKE;
|
|
|
+ }
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+#define IWL_PACKET_RETRY_TIME HZ
|
|
|
+
|
|
|
+static int iwl_is_duplicate_packet(struct iwl_priv *priv,
|
|
|
+ struct ieee80211_hdr *header)
|
|
|
+{
|
|
|
+ u16 sc = le16_to_cpu(header->seq_ctrl);
|
|
|
+ u16 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
|
|
|
+ u16 frag = sc & IEEE80211_SCTL_FRAG;
|
|
|
+ u16 *last_seq, *last_frag;
|
|
|
+ unsigned long *last_time;
|
|
|
+
|
|
|
+ switch (priv->iw_mode) {
|
|
|
+ case IEEE80211_IF_TYPE_IBSS:{
|
|
|
+ struct list_head *p;
|
|
|
+ struct iwl4965_ibss_seq *entry = NULL;
|
|
|
+ u8 *mac = header->addr2;
|
|
|
+ int index = mac[5] & (IWL_IBSS_MAC_HASH_SIZE - 1);
|
|
|
+
|
|
|
+ __list_for_each(p, &priv->ibss_mac_hash[index]) {
|
|
|
+ entry = list_entry(p, struct iwl4965_ibss_seq, list);
|
|
|
+ if (!compare_ether_addr(entry->mac, mac))
|
|
|
+ break;
|
|
|
+ }
|
|
|
+ if (p == &priv->ibss_mac_hash[index]) {
|
|
|
+ entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
|
|
|
+ if (!entry) {
|
|
|
+ IWL_ERROR("Cannot malloc new mac entry\n");
|
|
|
+ return 0;
|
|
|
+ }
|
|
|
+ memcpy(entry->mac, mac, ETH_ALEN);
|
|
|
+ entry->seq_num = seq;
|
|
|
+ entry->frag_num = frag;
|
|
|
+ entry->packet_time = jiffies;
|
|
|
+ list_add(&entry->list, &priv->ibss_mac_hash[index]);
|
|
|
+ return 0;
|
|
|
+ }
|
|
|
+ last_seq = &entry->seq_num;
|
|
|
+ last_frag = &entry->frag_num;
|
|
|
+ last_time = &entry->packet_time;
|
|
|
+ break;
|
|
|
+ }
|
|
|
+ case IEEE80211_IF_TYPE_STA:
|
|
|
+ last_seq = &priv->last_seq_num;
|
|
|
+ last_frag = &priv->last_frag_num;
|
|
|
+ last_time = &priv->last_packet_time;
|
|
|
+ break;
|
|
|
+ default:
|
|
|
+ return 0;
|
|
|
+ }
|
|
|
+ if ((*last_seq == seq) &&
|
|
|
+ time_after(*last_time + IWL_PACKET_RETRY_TIME, jiffies)) {
|
|
|
+ if (*last_frag == frag)
|
|
|
+ goto drop;
|
|
|
+ if (*last_frag + 1 != frag)
|
|
|
+ /* out-of-order fragment */
|
|
|
+ goto drop;
|
|
|
+ } else
|
|
|
+ *last_seq = seq;
|
|
|
+
|
|
|
+ *last_frag = frag;
|
|
|
+ *last_time = jiffies;
|
|
|
+ return 0;
|
|
|
+
|
|
|
+ drop:
|
|
|
+ return 1;
|
|
|
+}
|
|
|
+
|
|
|
+static int iwl_is_network_packet(struct iwl_priv *priv,
|
|
|
+ struct ieee80211_hdr *header)
|
|
|
+{
|
|
|
+ /* Filter incoming packets to determine if they are targeted toward
|
|
|
+ * this network, discarding packets coming from ourselves */
|
|
|
+ switch (priv->iw_mode) {
|
|
|
+ case IEEE80211_IF_TYPE_IBSS: /* Header: Dest. | Source | BSSID */
|
|
|
+ /* packets from our adapter are dropped (echo) */
|
|
|
+ if (!compare_ether_addr(header->addr2, priv->mac_addr))
|
|
|
+ return 0;
|
|
|
+ /* {broad,multi}cast packets to our IBSS go through */
|
|
|
+ if (is_multicast_ether_addr(header->addr1))
|
|
|
+ return !compare_ether_addr(header->addr3, priv->bssid);
|
|
|
+ /* packets to our adapter go through */
|
|
|
+ return !compare_ether_addr(header->addr1, priv->mac_addr);
|
|
|
+ case IEEE80211_IF_TYPE_STA: /* Header: Dest. | AP{BSSID} | Source */
|
|
|
+ /* packets from our adapter are dropped (echo) */
|
|
|
+ if (!compare_ether_addr(header->addr3, priv->mac_addr))
|
|
|
+ return 0;
|
|
|
+ /* {broad,multi}cast packets to our BSS go through */
|
|
|
+ if (is_multicast_ether_addr(header->addr1))
|
|
|
+ return !compare_ether_addr(header->addr2, priv->bssid);
|
|
|
+ /* packets to our adapter go through */
|
|
|
+ return !compare_ether_addr(header->addr1, priv->mac_addr);
|
|
|
+ default:
|
|
|
+ break;
|
|
|
+ }
|
|
|
+
|
|
|
+ return 1;
|
|
|
+}
|
|
|
+
|
|
|
+/* Called for REPLY_RX (legacy ABG frames), or
|
|
|
+ * REPLY_RX_MPDU_CMD (HT high-throughput N frames). */
|
|
|
+void iwl_rx_reply_rx(struct iwl_priv *priv,
|
|
|
+ struct iwl_rx_mem_buffer *rxb)
|
|
|
+{
|
|
|
+ struct ieee80211_hdr *header;
|
|
|
+ struct ieee80211_rx_status rx_status;
|
|
|
+ struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data;
|
|
|
+ /* Use phy data (Rx signal strength, etc.) contained within
|
|
|
+ * this rx packet for legacy frames,
|
|
|
+ * or phy data cached from REPLY_RX_PHY_CMD for HT frames. */
|
|
|
+ int include_phy = (pkt->hdr.cmd == REPLY_RX);
|
|
|
+ struct iwl4965_rx_phy_res *rx_start = (include_phy) ?
|
|
|
+ (struct iwl4965_rx_phy_res *)&(pkt->u.raw[0]) :
|
|
|
+ (struct iwl4965_rx_phy_res *)&priv->last_phy_res[1];
|
|
|
+ __le32 *rx_end;
|
|
|
+ unsigned int len = 0;
|
|
|
+ u16 fc;
|
|
|
+ u8 network_packet;
|
|
|
+
|
|
|
+ rx_status.mactime = le64_to_cpu(rx_start->timestamp);
|
|
|
+ rx_status.freq =
|
|
|
+ ieee80211_channel_to_frequency(le16_to_cpu(rx_start->channel));
|
|
|
+ rx_status.band = (rx_start->phy_flags & RX_RES_PHY_FLAGS_BAND_24_MSK) ?
|
|
|
+ IEEE80211_BAND_2GHZ : IEEE80211_BAND_5GHZ;
|
|
|
+ rx_status.rate_idx =
|
|
|
+ iwl_hwrate_to_plcp_idx(le32_to_cpu(rx_start->rate_n_flags));
|
|
|
+ if (rx_status.band == IEEE80211_BAND_5GHZ)
|
|
|
+ rx_status.rate_idx -= IWL_FIRST_OFDM_RATE;
|
|
|
+
|
|
|
+ rx_status.antenna = 0;
|
|
|
+ rx_status.flag = 0;
|
|
|
+
|
|
|
+ if ((unlikely(rx_start->cfg_phy_cnt > 20))) {
|
|
|
+ IWL_DEBUG_DROP("dsp size out of range [0,20]: %d/n",
|
|
|
+ rx_start->cfg_phy_cnt);
|
|
|
+ return;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (!include_phy) {
|
|
|
+ if (priv->last_phy_res[0])
|
|
|
+ rx_start = (struct iwl4965_rx_phy_res *)
|
|
|
+ &priv->last_phy_res[1];
|
|
|
+ else
|
|
|
+ rx_start = NULL;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (!rx_start) {
|
|
|
+ IWL_ERROR("MPDU frame without a PHY data\n");
|
|
|
+ return;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (include_phy) {
|
|
|
+ header = (struct ieee80211_hdr *)((u8 *) &rx_start[1]
|
|
|
+ + rx_start->cfg_phy_cnt);
|
|
|
+
|
|
|
+ len = le16_to_cpu(rx_start->byte_count);
|
|
|
+ rx_end = (__le32 *)(pkt->u.raw + rx_start->cfg_phy_cnt +
|
|
|
+ sizeof(struct iwl4965_rx_phy_res) + len);
|
|
|
+ } else {
|
|
|
+ struct iwl4965_rx_mpdu_res_start *amsdu =
|
|
|
+ (struct iwl4965_rx_mpdu_res_start *)pkt->u.raw;
|
|
|
+
|
|
|
+ header = (void *)(pkt->u.raw +
|
|
|
+ sizeof(struct iwl4965_rx_mpdu_res_start));
|
|
|
+ len = le16_to_cpu(amsdu->byte_count);
|
|
|
+ rx_end = (__le32 *) (pkt->u.raw +
|
|
|
+ sizeof(struct iwl4965_rx_mpdu_res_start) + len);
|
|
|
+ }
|
|
|
+
|
|
|
+ if (!(*rx_end & RX_RES_STATUS_NO_CRC32_ERROR) ||
|
|
|
+ !(*rx_end & RX_RES_STATUS_NO_RXE_OVERFLOW)) {
|
|
|
+ IWL_DEBUG_RX("Bad CRC or FIFO: 0x%08X.\n",
|
|
|
+ le32_to_cpu(*rx_end));
|
|
|
+ return;
|
|
|
+ }
|
|
|
+
|
|
|
+ priv->ucode_beacon_time = le32_to_cpu(rx_start->beacon_time_stamp);
|
|
|
+
|
|
|
+ /* Find max signal strength (dBm) among 3 antenna/receiver chains */
|
|
|
+ rx_status.signal = iwl_calc_rssi(priv, rx_start);
|
|
|
+
|
|
|
+ /* Meaningful noise values are available only from beacon statistics,
|
|
|
+ * which are gathered only when associated, and indicate noise
|
|
|
+ * only for the associated network channel ...
|
|
|
+ * Ignore these noise values while scanning (other channels) */
|
|
|
+ if (iwl_is_associated(priv) &&
|
|
|
+ !test_bit(STATUS_SCANNING, &priv->status)) {
|
|
|
+ rx_status.noise = priv->last_rx_noise;
|
|
|
+ rx_status.qual = iwl_calc_sig_qual(rx_status.signal,
|
|
|
+ rx_status.noise);
|
|
|
+ } else {
|
|
|
+ rx_status.noise = IWL_NOISE_MEAS_NOT_AVAILABLE;
|
|
|
+ rx_status.qual = iwl_calc_sig_qual(rx_status.signal, 0);
|
|
|
+ }
|
|
|
+
|
|
|
+ /* Reset beacon noise level if not associated. */
|
|
|
+ if (!iwl_is_associated(priv))
|
|
|
+ priv->last_rx_noise = IWL_NOISE_MEAS_NOT_AVAILABLE;
|
|
|
+
|
|
|
+ /* Set "1" to report good data frames in groups of 100 */
|
|
|
+ /* FIXME: need to optimze the call: */
|
|
|
+ iwl_dbg_report_frame(priv, pkt, header, 1);
|
|
|
+
|
|
|
+ IWL_DEBUG_STATS_LIMIT("Rssi %d, noise %d, qual %d, TSF %llu\n",
|
|
|
+ rx_status.signal, rx_status.noise, rx_status.signal,
|
|
|
+ (unsigned long long)rx_status.mactime);
|
|
|
+
|
|
|
+
|
|
|
+ if (priv->iw_mode == IEEE80211_IF_TYPE_MNTR) {
|
|
|
+ iwl_handle_data_packet(priv, 1, include_phy,
|
|
|
+ rxb, &rx_status);
|
|
|
+ return;
|
|
|
+ }
|
|
|
+
|
|
|
+ network_packet = iwl_is_network_packet(priv, header);
|
|
|
+ if (network_packet) {
|
|
|
+ priv->last_rx_rssi = rx_status.signal;
|
|
|
+ priv->last_beacon_time = priv->ucode_beacon_time;
|
|
|
+ priv->last_tsf = le64_to_cpu(rx_start->timestamp);
|
|
|
+ }
|
|
|
+
|
|
|
+ fc = le16_to_cpu(header->frame_control);
|
|
|
+ switch (fc & IEEE80211_FCTL_FTYPE) {
|
|
|
+ case IEEE80211_FTYPE_MGMT:
|
|
|
+ if (priv->iw_mode == IEEE80211_IF_TYPE_AP)
|
|
|
+ iwl_update_ps_mode(priv, fc & IEEE80211_FCTL_PM,
|
|
|
+ header->addr2);
|
|
|
+ iwl_handle_data_packet(priv, 0, include_phy, rxb, &rx_status);
|
|
|
+ break;
|
|
|
+
|
|
|
+ case IEEE80211_FTYPE_CTL:
|
|
|
+ switch (fc & IEEE80211_FCTL_STYPE) {
|
|
|
+ case IEEE80211_STYPE_BACK_REQ:
|
|
|
+ IWL_DEBUG_HT("IEEE80211_STYPE_BACK_REQ arrived\n");
|
|
|
+ iwl_handle_data_packet(priv, 0, include_phy,
|
|
|
+ rxb, &rx_status);
|
|
|
+ break;
|
|
|
+ default:
|
|
|
+ break;
|
|
|
+ }
|
|
|
+ break;
|
|
|
+
|
|
|
+ case IEEE80211_FTYPE_DATA: {
|
|
|
+ DECLARE_MAC_BUF(mac1);
|
|
|
+ DECLARE_MAC_BUF(mac2);
|
|
|
+ DECLARE_MAC_BUF(mac3);
|
|
|
+
|
|
|
+ if (priv->iw_mode == IEEE80211_IF_TYPE_AP)
|
|
|
+ iwl_update_ps_mode(priv, fc & IEEE80211_FCTL_PM,
|
|
|
+ header->addr2);
|
|
|
+
|
|
|
+ if (unlikely(!network_packet))
|
|
|
+ IWL_DEBUG_DROP("Dropping (non network): "
|
|
|
+ "%s, %s, %s\n",
|
|
|
+ print_mac(mac1, header->addr1),
|
|
|
+ print_mac(mac2, header->addr2),
|
|
|
+ print_mac(mac3, header->addr3));
|
|
|
+ else if (unlikely(iwl_is_duplicate_packet(priv, header)))
|
|
|
+ IWL_DEBUG_DROP("Dropping (dup): %s, %s, %s\n",
|
|
|
+ print_mac(mac1, header->addr1),
|
|
|
+ print_mac(mac2, header->addr2),
|
|
|
+ print_mac(mac3, header->addr3));
|
|
|
+ else
|
|
|
+ iwl_handle_data_packet(priv, 1, include_phy, rxb,
|
|
|
+ &rx_status);
|
|
|
+ break;
|
|
|
+ }
|
|
|
+ default:
|
|
|
+ break;
|
|
|
+
|
|
|
+ }
|
|
|
+}
|
|
|
+EXPORT_SYMBOL(iwl_rx_reply_rx);
|
|
|
+
|
|
|
+/* Cache phy data (Rx signal strength, etc) for HT frame (REPLY_RX_PHY_CMD).
|
|
|
+ * This will be used later in iwl_rx_reply_rx() for REPLY_RX_MPDU_CMD. */
|
|
|
+void iwl_rx_reply_rx_phy(struct iwl_priv *priv,
|
|
|
+ struct iwl_rx_mem_buffer *rxb)
|
|
|
+{
|
|
|
+ struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data;
|
|
|
+ priv->last_phy_res[0] = 1;
|
|
|
+ memcpy(&priv->last_phy_res[1], &(pkt->u.raw[0]),
|
|
|
+ sizeof(struct iwl4965_rx_phy_res));
|
|
|
+}
|
|
|
+EXPORT_SYMBOL(iwl_rx_reply_rx_phy);
|
Emmanuel Grumbach