On Thu, Nov 3, 2011 at 7:25 PM, Zefir Kurtisi <[email protected]> wrote:
> This initial DFS module provides basic functionality to deal with
> radar pulses reported by the DFS HW pattern detector.
>
> The reported data is evaluated and basic plausibility checks are
> performed to filter false pulses. Passing radar pulses are
> forwarded to pattern detectors (not part of this patch).
>
> The patch also includes
> * new debug level ATH_DBG_DFS
> * debugfs DFS radar statistics
>
> Signed-off-by: Zefir Kurtisi <[email protected]>
> ---
> drivers/net/wireless/ath/ath.h | 2 +
> drivers/net/wireless/ath/ath9k/dfs.c | 192
> ++++++++++++++++++++++++++++
> drivers/net/wireless/ath/ath9k/dfs.h | 24 ++++
> drivers/net/wireless/ath/ath9k/dfs_debug.c | 89 +++++++++++++
> drivers/net/wireless/ath/ath9k/dfs_debug.h | 59 +++++++++
> 5 files changed, 366 insertions(+), 0 deletions(-)
> create mode 100644 drivers/net/wireless/ath/ath9k/dfs.c
> create mode 100644 drivers/net/wireless/ath/ath9k/dfs.h
> create mode 100644 drivers/net/wireless/ath/ath9k/dfs_debug.c
> create mode 100644 drivers/net/wireless/ath/ath9k/dfs_debug.h
>
> diff --git a/drivers/net/wireless/ath/ath.h b/drivers/net/wireless/ath/ath.h
> index 46d6926..e38fcad 100644
> --- a/drivers/net/wireless/ath/ath.h
> +++ b/drivers/net/wireless/ath/ath.h
> @@ -215,6 +215,7 @@ do {
> \
> * @ATH_DBG_HWTIMER: hardware timer handling
> * @ATH_DBG_BTCOEX: bluetooth coexistance
> * @ATH_DBG_BSTUCK: stuck beacons
> + * @ATH_DBG_DFS: radar datection
> * @ATH_DBG_ANY: enable all debugging
> *
> * The debug level is used to control the amount and type of debugging output
> @@ -240,6 +241,7 @@ enum ATH_DEBUG {
> ATH_DBG_BTCOEX = 0x00002000,
> ATH_DBG_WMI = 0x00004000,
> ATH_DBG_BSTUCK = 0x00008000,
> + ATH_DBG_DFS = 0x00010000,
> ATH_DBG_ANY = 0xffffffff
> };
>
> diff --git a/drivers/net/wireless/ath/ath9k/dfs.c
> b/drivers/net/wireless/ath/ath9k/dfs.c
> new file mode 100644
> index 0000000..9d3c8b9
> --- /dev/null
> +++ b/drivers/net/wireless/ath/ath9k/dfs.c
> @@ -0,0 +1,192 @@
> +/*
> + * Copyright (c) 2008-2011 Atheros Communications Inc.
> + * Copyright (c) 2011 Neratec Solutions AG
> + *
> + * Permission to use, copy, modify, and/or distribute this software for any
> + * purpose with or without fee is hereby granted, provided that the above
> + * copyright notice and this permission notice appear in all copies.
> + *
> + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
> + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
> + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
> + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
> + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
> + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
> + * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
> + */
> +
> +#include "hw.h"
> +#include "hw-ops.h"
> +#include "ath9k.h"
> +#include "dfs.h"
> +#include "dfs_debug.h"
> +
> +/* pulse duration reported is scaled with 1000/800 us */
> +#define AR93X_NSECS_PER_DUR 800
> +static u32 dur_to_usecs(u32 dur)
> +{
> + return (dur * AR93X_NSECS_PER_DUR + 500) / 1000;
> +}
> +
> +/* internal struct to pass radar data */
> +struct ath_radar_data {
> + u8 pulse_bw_info;
> + u8 rssi;
> + u8 ext_rssi;
> + u8 pulse_length_ext;
> + u8 pulse_length_pri;
> +};
> +
> +/* TODO: move into or synchronize this with generic header
> + * as soon as IF is defined */
> +struct dfs_radar_pulse {
> + u16 freq;
> + u64 ts;
> + u32 width;
> + u8 rssi;
> +};
> +
> +#define PRI_CH_RADAR_FOUND 0x01
> +#define EXT_CH_RADAR_FOUND 0x02
> +static bool postprocess_radar_event(struct ath_softc *sc,
> + struct ath_radar_data *are, struct dfs_radar_pulse *drp)
ath9k_postprocess_radar_event would be better?
> +{
> + u8 rssi;
> + u16 dur;
> +
> + ath_dbg(ath9k_hw_common(sc->sc_ah), ATH_DBG_DFS,
> + "pulse_bw_info=0x%x, pri,ext len/rssi=(%u/%u, %u/%u)\n",
> + are->pulse_bw_info,
> + are->pulse_length_pri, are->rssi,
> + are->pulse_length_ext, are->ext_rssi);
> +
> + /* Only the last 2 bits of the BW info are relevant, they indicate
> + which channel the radar was detected in.*/
> + are->pulse_bw_info &= 0x03;
> +
> + switch (are->pulse_bw_info) {
> + case 0:
> + /* Bogus bandwidth info received in descriptor,
> + so ignore this PHY error */
> + DFS_STAT_INC(sc, bwinfo_discards);
> + return false;
> + case PRI_CH_RADAR_FOUND:
> + /* radar in ctrl channel */
> + dur = are->pulse_length_pri;
> + DFS_STAT_INC(sc, pri_phy_errors);
> + /* cannot use ctrl channel RSSI
> + * if extension channel is stronger */
> + rssi = (are->ext_rssi >= (are->rssi + 3)) ? 0 : are->rssi;
> + break;
> + case EXT_CH_RADAR_FOUND:
> + /* radar in extension channel */
> + dur = are->pulse_length_ext;
> + DFS_STAT_INC(sc, ext_phy_errors);
> + /* cannot use extension channel RSSI
> + * if control channel is stronger */
> + rssi = (are->rssi >= (are->ext_rssi + 12)) ? 0 :
> are->ext_rssi;
> + break;
> + case (PRI_CH_RADAR_FOUND | EXT_CH_RADAR_FOUND):
> + /*
> + * Conducted testing, when pulse is on DC, both pri and ext
> + * durations are reported to be same
> + *
> + * Radiated testing, when pulse is on DC, different pri and
> + * ext durations are reported, so take the larger of the two
> + * */
> + if (are->pulse_length_ext >= are->pulse_length_pri)
> + dur = are->pulse_length_ext;
> + else
> + dur = are->pulse_length_pri;
> + DFS_STAT_INC(sc, dc_phy_errors);
> +
> + /* when both are present use stronger one */
> + rssi = (are->rssi < are->ext_rssi) ? are->ext_rssi :
> are->rssi;
> + break;
> + }
> +
> + if (rssi == 0) {
> + DFS_STAT_INC(sc, rssi_discards);
> + return false;
> + }
> +
> + /*
> + * TODO: check chirping pulses
> + */
> +
> + /* convert duration to usecs */
> + drp->width = dur_to_usecs(dur);
> + drp->rssi = rssi;
> +
> + DFS_STAT_INC(sc, pulses_detected);
> + return true;
> +}
> +
> +
> +/*
> + * DFS: check PHY-error for radar pulse and feed the detector
> + */
> +void ath9k_dfs_process_phyerr(struct ath_softc *sc, void *data,
> + struct ath_rx_status *rs, u64 mactime)
> +{
> + struct ath_radar_data ard;
> + u16 datalen;
> + char *vdata_end;
> + struct dfs_radar_pulse drp;
> + struct ath_hw *ah = sc->sc_ah;
> + struct ath_common *common = ath9k_hw_common(ah);
> +
> + if ((!(rs->rs_phyerr != ATH9K_PHYERR_RADAR)) &&
> + (!(rs->rs_phyerr != ATH9K_PHYERR_FALSE_RADAR_EXT))) {
> + ath_dbg(common, ATH_DBG_DFS,
> + "Error: rs_phyer=0x%x not a radar error\n",
> + rs->rs_phyerr);
> + return;
> + }
> +
> + datalen = rs->rs_datalen;
> + if (datalen == 0) {
> + DFS_STAT_INC(sc, datalen_discards);
> + return;
> + }
> +
> + ard.rssi = rs->rs_rssi_ctl0;
> + ard.ext_rssi = rs->rs_rssi_ext0;
> +
> + /* hardware stores this as 8 bit signed value.
> + * we will cap it at 0 if it is a negative number
> + */
> + if (ard.rssi & 0x80)
> + ard.rssi = 0;
> + if (ard.ext_rssi & 0x80)
> + ard.ext_rssi = 0;
> +
> + vdata_end = (char *)data + datalen;
> + ard.pulse_bw_info = vdata_end[-1];
> + ard.pulse_length_ext = vdata_end[-2];
> + ard.pulse_length_pri = vdata_end[-3];
> +
> + ath_dbg(common, ATH_DBG_DFS,
> + "bw_info=%d, length_pri=%d, length_ext=%d, "
> + "rssi_pri=%d, rssi_ext=%d\n",
> + ard.pulse_bw_info, ard.pulse_length_pri, ard.pulse_length_ext,
> + ard.rssi, ard.ext_rssi);
> +
> + drp.freq = ah->curchan->channel;
> + drp.ts = mactime;
> + if (postprocess_radar_event(sc, &ard, &drp)) {
> + static u64 last_ts;
> + ath_dbg(common, ATH_DBG_DFS,
> + "ath9k_dfs_process_phyerr: channel=%d, ts=%llu, "
> + "width=%d, rssi=%d, delta_ts=%llu\n",
> + drp.freq, drp.ts, drp.width, drp.rssi,
> drp.ts-last_ts);
> + last_ts = drp.ts;
> + /*
> + * TODO: forward pulse to pattern detector
> + *
> + * ieee80211_add_radar_pulse(drp.freq, drp.ts,
> + * drp.width, drp.rssi);
> + */
> + }
> +}
> +EXPORT_SYMBOL(ath9k_dfs_process_phyerr);
> diff --git a/drivers/net/wireless/ath/ath9k/dfs.h
> b/drivers/net/wireless/ath/ath9k/dfs.h
> new file mode 100644
> index 0000000..4d95cad
> --- /dev/null
> +++ b/drivers/net/wireless/ath/ath9k/dfs.h
> @@ -0,0 +1,24 @@
> +/*
> + * Copyright (c) 2008-2011 Atheros Communications Inc.
> + * Copyright (c) 2011 Neratec Solutions AG
> + *
> + * Permission to use, copy, modify, and/or distribute this software for any
> + * purpose with or without fee is hereby granted, provided that the above
> + * copyright notice and this permission notice appear in all copies.
> + *
> + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
> + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
> + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
> + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
> + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
> + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
> + * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
> + */
> +
> +#ifndef ATH9K_DFS_H
> +#define ATH9K_DFS_H
> +
> +void ath9k_dfs_process_phyerr(struct ath_softc *sc, void *data,
> + struct ath_rx_status *rs, u64 mactime);
> +
> +#endif /* ATH9K_DFS_H */
> diff --git a/drivers/net/wireless/ath/ath9k/dfs_debug.c
> b/drivers/net/wireless/ath/ath9k/dfs_debug.c
> new file mode 100644
> index 0000000..3c03552
> --- /dev/null
> +++ b/drivers/net/wireless/ath/ath9k/dfs_debug.c
> @@ -0,0 +1,89 @@
> +/*
> + * Copyright (c) 2008-2011 Atheros Communications Inc.
> + * Copyright (c) 2011 Neratec Solutions AG
> + *
> + * Permission to use, copy, modify, and/or distribute this software for any
> + * purpose with or without fee is hereby granted, provided that the above
> + * copyright notice and this permission notice appear in all copies.
> + *
> + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
> + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
> + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
> + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
> + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
> + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
> + * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
> + */
> +
> +
> +#include <linux/debugfs.h>
> +
> +#include "ath9k.h"
> +#include "dfs_debug.h"
> +
> +
> +#if defined(CONFIG_ATH9K_DEBUGFS)
> +
> +#define ATH9K_DFS_STAT(s, p) \
> + len += snprintf(buf + len, size - len, "%28s : %10u\n", s, \
> + sc->debug.stats.dfs_stats.p);
> +
> +static ssize_t read_file_dfs(struct file *file, char __user *user_buf,
> + size_t count, loff_t *ppos)
> +{
> + struct ath_softc *sc = file->private_data;
> + struct ath9k_hw_version *hw_ver = &sc->sc_ah->hw_version;
> + char *buf;
> + unsigned int len = 0, size = 8000;
> + ssize_t retval = 0;
> +
> + buf = kzalloc(size, GFP_KERNEL);
> + if (buf == NULL)
> + return -ENOMEM;
> +
> + len += snprintf(buf + len, size - len, "DFS support for "
> + "macVersion = 0x%x, macRev = 0x%x: %s\n",
> + hw_ver->macVersion, hw_ver->macRev,
> + (sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_DFS) ?
> + "enabled" : "disabled");
> + ATH9K_DFS_STAT("DFS pulses detected ", pulses_detected);
> + ATH9K_DFS_STAT("Datalen discards ", datalen_discards);
> + ATH9K_DFS_STAT("RSSI discards ", rssi_discards);
> + ATH9K_DFS_STAT("BW info discards ", bwinfo_discards);
> + ATH9K_DFS_STAT("Primary channel pulses ", pri_phy_errors);
> + ATH9K_DFS_STAT("Secondary channel pulses", ext_phy_errors);
> + ATH9K_DFS_STAT("Dual channel pulses ", dc_phy_errors);
> +
> + if (len > size)
> + len = size;
> +
> + retval = simple_read_from_buffer(user_buf, count, ppos, buf, len);
> + kfree(buf);
> +
> + return retval;
> +}
> +
> +static int ath9k_dfs_debugfs_open(struct inode *inode, struct file *file)
> +{
> + file->private_data = inode->i_private;
> + return 0;
> +}
> +
> +
> +static const struct file_operations fops_dfs_stats = {
> + .read = read_file_dfs,
> + .open = ath9k_dfs_debugfs_open,
> + .owner = THIS_MODULE,
> + .llseek = default_llseek,
> +};
> +
> +
> +void ath9k_dfs_init_debug(struct ath_softc *sc)
> +{
> + debugfs_create_file("dfs_stats", S_IRUSR,
> + sc->debug.debugfs_phy, sc, &fops_dfs_stats);
> +}
> +EXPORT_SYMBOL(ath9k_dfs_init_debug);
> +
> +#endif /* CONFIG_ATH9K_DEBUGFS */
> +
> diff --git a/drivers/net/wireless/ath/ath9k/dfs_debug.h
> b/drivers/net/wireless/ath/ath9k/dfs_debug.h
> new file mode 100644
> index 0000000..079cf53
> --- /dev/null
> +++ b/drivers/net/wireless/ath/ath9k/dfs_debug.h
> @@ -0,0 +1,59 @@
> +/*
> + * Copyright (c) 2008-2011 Atheros Communications Inc.
> + * Copyright (c) 2011 Neratec Solutions AG
> + *
> + * Permission to use, copy, modify, and/or distribute this software for any
> + * purpose with or without fee is hereby granted, provided that the above
> + * copyright notice and this permission notice appear in all copies.
> + *
> + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
> + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
> + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
> + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
> + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
> + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
> + * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
> + */
> +
> +
> +#ifndef DFS_DEBUG_H
> +#define DFS_DEBUG_H
> +
> +#include "hw.h"
> +
> +/**
> + * struct ath_dfs_stats - DFS Statistics
> + *
> + * @pulses_detected: No. of pulses detected so far
> + * @datalen_discards: No. of pulses discarded due to invalid datalen
> + * @rssi_discards: No. of pulses discarded due to invalid RSSI
> + * @bwinfo_discards: No. of pulses discarded due to invalid BW info
> + * @pri_phy_errors: No. of pulses reported for primary channel
> + * @ext_phy_errors: No. of pulses reported for extension channel
> + * @dc_phy_errors: No. of pulses reported for primary + extension channel
> + */
> +struct ath_dfs_stats {
> + u32 pulses_detected;
> + u32 datalen_discards;
> + u32 rssi_discards;
> + u32 bwinfo_discards;
> + u32 pri_phy_errors;
> + u32 ext_phy_errors;
> + u32 dc_phy_errors;
> +};
> +
> +
> +#if defined(CONFIG_ATH9K_DEBUGFS)
> +
> +#define DFS_STAT_INC(sc, c) (sc->debug.stats.dfs_stats.c++)
> +void ath9k_dfs_init_debug(struct ath_softc *sc);
> +
> +#else
> +
> +#define DFS_STAT_INC(sc, c) do { } while (0)
> +static inline void ath9k_dfs_init_debug(struct ath_softc *sc) { }
> +
> +#endif
> +
> +
> +#endif /* DFS_DEBUG_H */
> --
> 1.7.4.1
>
> --
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--
shafi
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