| /* |
| * Copyright (c) 2002-2013 The Linux Foundation. All rights reserved. |
| * |
| * Previously licensed under the ISC license by Qualcomm Atheros, Inc. |
| * |
| * |
| * 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. |
| */ |
| |
| /* |
| * This file was originally distributed by Qualcomm Atheros, Inc. |
| * under proprietary terms before Copyright ownership was assigned |
| * to the Linux Foundation. |
| */ |
| |
| /*=========================================================================== |
| |
| dfs_misc.c |
| |
| OVERVIEW: |
| |
| Source code borrowed from QCA_MAIN DFS module |
| |
| DEPENDENCIES: |
| |
| Are listed for each API below. |
| |
| ===========================================================================*/ |
| |
| /*=========================================================================== |
| |
| EDIT HISTORY FOR FILE |
| |
| |
| This section contains comments describing changes made to the module. |
| Notice that changes are listed in reverse chronological order. |
| |
| |
| |
| when who what, where, why |
| ---------- --- -------------------------------------------------------- |
| |
| ===========================================================================*/ |
| |
| #include "dfs.h" |
| /* TO DO DFS |
| #include <ieee80211_var.h> |
| */ |
| #ifndef UNINET |
| /* TO DO DFS |
| #include <ieee80211_channel.h> |
| */ |
| #endif |
| #ifdef ATH_SUPPORT_DFS |
| |
| static int adjust_pri_per_chan_busy(int ext_chan_busy, int pri_margin) |
| { |
| int adjust_pri=0; |
| |
| if(ext_chan_busy > DFS_EXT_CHAN_LOADING_THRESH) { |
| |
| adjust_pri = (ext_chan_busy - DFS_EXT_CHAN_LOADING_THRESH) * (pri_margin); |
| adjust_pri /= 100; |
| |
| } |
| return adjust_pri; |
| } |
| |
| static int adjust_thresh_per_chan_busy(int ext_chan_busy, int thresh) |
| { |
| int adjust_thresh=0; |
| |
| if(ext_chan_busy > DFS_EXT_CHAN_LOADING_THRESH) { |
| |
| adjust_thresh = (ext_chan_busy - DFS_EXT_CHAN_LOADING_THRESH) * thresh; |
| adjust_thresh /= 100; |
| |
| } |
| return adjust_thresh; |
| } |
| /* For the extension channel, if legacy traffic is present, we see a lot of false alarms, |
| so make the PRI margin narrower depending on the busy % for the extension channel.*/ |
| |
| int |
| dfs_get_pri_margin(struct ath_dfs *dfs, int is_extchan_detect, |
| int is_fixed_pattern) |
| { |
| |
| int adjust_pri=0, ext_chan_busy=0; |
| int pri_margin; |
| |
| if (is_fixed_pattern) |
| pri_margin = DFS_DEFAULT_FIXEDPATTERN_PRI_MARGIN; |
| else |
| pri_margin = DFS_DEFAULT_PRI_MARGIN; |
| |
| adf_os_spin_lock_bh(&dfs->ic->chan_lock); |
| if (IS_CHAN_HT40(dfs->ic->ic_curchan)) { |
| adf_os_spin_unlock_bh(&dfs->ic->chan_lock); |
| ext_chan_busy = dfs->ic->ic_get_ext_busy(dfs->ic); |
| if(ext_chan_busy >= 0) { |
| dfs->dfs_rinfo.ext_chan_busy_ts = dfs->ic->ic_get_TSF64(dfs->ic); |
| dfs->dfs_rinfo.dfs_ext_chan_busy = ext_chan_busy; |
| } else { |
| // Check to see if the cached value of ext_chan_busy can be used |
| ext_chan_busy = 0; |
| if (dfs->dfs_rinfo.dfs_ext_chan_busy) { |
| if (dfs->dfs_rinfo.rn_lastfull_ts < dfs->dfs_rinfo.ext_chan_busy_ts) { |
| ext_chan_busy = dfs->dfs_rinfo.dfs_ext_chan_busy; |
| DFS_DPRINTK(dfs, ATH_DEBUG_DFS2, |
| " PRI Use cached copy of ext_chan_busy extchanbusy=%d \n", ext_chan_busy); |
| } |
| } |
| } |
| adjust_pri = adjust_pri_per_chan_busy(ext_chan_busy, pri_margin); |
| |
| pri_margin -= adjust_pri; |
| } else { |
| adf_os_spin_unlock_bh(&dfs->ic->chan_lock); |
| } |
| |
| return pri_margin; |
| } |
| |
| /* For the extension channel, if legacy traffic is present, we see a lot of false alarms, |
| so make the thresholds higher depending on the busy % for the extension channel.*/ |
| |
| int dfs_get_filter_threshold(struct ath_dfs *dfs, struct dfs_filter *rf, |
| int is_extchan_detect) |
| { |
| int ext_chan_busy=0; |
| int thresh, adjust_thresh=0; |
| |
| thresh = rf->rf_threshold; |
| |
| adf_os_spin_lock_bh(&dfs->ic->chan_lock); |
| if (IS_CHAN_HT40(dfs->ic->ic_curchan)) { |
| adf_os_spin_unlock_bh(&dfs->ic->chan_lock); |
| ext_chan_busy = dfs->ic->ic_get_ext_busy(dfs->ic); |
| if(ext_chan_busy >= 0) { |
| dfs->dfs_rinfo.ext_chan_busy_ts = dfs->ic->ic_get_TSF64(dfs->ic); |
| dfs->dfs_rinfo.dfs_ext_chan_busy = ext_chan_busy; |
| } else { |
| // Check to see if the cached value of ext_chan_busy can be used |
| ext_chan_busy = 0; |
| if (dfs->dfs_rinfo.dfs_ext_chan_busy) { |
| if (dfs->dfs_rinfo.rn_lastfull_ts < dfs->dfs_rinfo.ext_chan_busy_ts) { |
| ext_chan_busy = dfs->dfs_rinfo.dfs_ext_chan_busy; |
| DFS_DPRINTK(dfs, ATH_DEBUG_DFS2, |
| " THRESH Use cached copy of ext_chan_busy extchanbusy=%d rn_lastfull_ts=%llu ext_chan_busy_ts=%llu\n", |
| ext_chan_busy, |
| (unsigned long long)dfs->dfs_rinfo.rn_lastfull_ts, |
| (unsigned long long)dfs->dfs_rinfo.ext_chan_busy_ts); |
| } |
| } |
| } |
| |
| adjust_thresh = adjust_thresh_per_chan_busy(ext_chan_busy, thresh); |
| |
| DFS_DPRINTK(dfs, ATH_DEBUG_DFS2, |
| " filterID=%d extchanbusy=%d adjust_thresh=%d\n", |
| rf->rf_pulseid, ext_chan_busy, adjust_thresh); |
| |
| thresh += adjust_thresh; |
| } else { |
| adf_os_spin_unlock_bh(&dfs->ic->chan_lock); |
| } |
| return thresh; |
| } |
| |
| |
| u_int32_t dfs_round(int32_t val) |
| { |
| u_int32_t ival,rem; |
| |
| if (val < 0) |
| return 0; |
| ival = val/100; |
| rem = val-(ival*100); |
| if (rem <50) |
| return ival; |
| else |
| return(ival+1); |
| } |
| |
| struct ieee80211_channel * |
| ieee80211_get_extchan(struct ieee80211com *ic) |
| { |
| int chan_offset = 0; |
| if (IEEE80211_IS_CHAN_HT40PLUS_CAPABLE(ic->ic_curchan)) { |
| chan_offset = 20; |
| } else if (IEEE80211_IS_CHAN_HT40MINUS_CAPABLE(ic->ic_curchan)) { |
| chan_offset = -20; |
| } else { |
| return NULL; |
| } |
| |
| return(ic->ic_find_channel(ic, ic->ic_curchan->ic_freq + chan_offset, IEEE80211_CHAN_11NA_HT20)); |
| } |
| |
| /* |
| * Finds the radar state entry that matches the current channel |
| */ |
| struct dfs_state * |
| dfs_getchanstate(struct ath_dfs *dfs, u_int8_t *index, int ext_chan_flag) |
| { |
| struct dfs_state *rs=NULL; |
| int i; |
| struct ieee80211_channel *cmp_ch; |
| |
| if (dfs == NULL) { |
| printk("%s[%d]: sc_dfs is NULL\n",__func__,__LINE__); |
| // DFS_DPRINTK(dfs, ATH_DEBUG_DFS,"%s: sc_dfs is NULL\n",__func__); |
| return NULL; |
| } |
| |
| if (ext_chan_flag) { |
| cmp_ch = ieee80211_get_extchan(dfs->ic); |
| if (cmp_ch) { |
| DFS_DPRINTK(dfs, ATH_DEBUG_DFS2, "Extension channel freq = %u flags=0x%x\n", cmp_ch->ic_freq, cmp_ch->ic_flagext); |
| } else { |
| return NULL; |
| } |
| |
| } else { |
| cmp_ch = dfs->ic->ic_curchan; |
| DFS_DPRINTK(dfs, ATH_DEBUG_DFS2, "Primary channel freq = %u flags=0x%x\n", cmp_ch->ic_freq, cmp_ch->ic_flagext); |
| } |
| for (i=0;i<DFS_NUM_RADAR_STATES; i++) { |
| if ((dfs->dfs_radar[i].rs_chan.ic_freq== cmp_ch->ic_freq) && |
| (dfs->dfs_radar[i].rs_chan.ic_flags == cmp_ch->ic_flags)) { |
| if (index != NULL) |
| *index = (u_int8_t) i; |
| |
| return &(dfs->dfs_radar[i]); |
| } |
| } |
| /* No existing channel found, look for first free channel state entry */ |
| for (i=0; i<DFS_NUM_RADAR_STATES; i++) { |
| if (dfs->dfs_radar[i].rs_chan.ic_freq == 0) { |
| rs = &(dfs->dfs_radar[i]); |
| /* Found one, set channel info and default thresholds */ |
| rs->rs_chan = *cmp_ch; |
| |
| /* Copy the parameters from the default set */ |
| ath_dfs_phyerr_param_copy(&rs->rs_param, |
| &dfs->dfs_defaultparams); |
| |
| if (index != NULL) |
| *index = (u_int8_t) i; |
| return (rs); |
| } |
| } |
| DFS_DPRINTK(dfs, ATH_DEBUG_DFS2, "%s: No more radar states left.\n", __func__); |
| return(NULL); |
| } |
| |
| |
| |
| #endif /* ATH_SUPPORT_DFS */ |