void dfs_process_ar_event(struct ath_softc *sc, HAL_CHANNEL *chan)
{
struct ath_dfs *dfs=sc->sc_dfs;
struct dfs_ar_state *ar;
struct dfs_event *re=NULL;
u_int32_t sumpeak=0,numpeaks,rssi,width,origregionsum=0, i;
u_int16_t thistimestamp;
int empty;
if (dfs == NULL) {
DFS_DPRINTK(sc, ATH_DEBUG_DFS, "%s: sc_dfs is NULL\n",
__func__);
return;
}
ar = (struct dfs_ar_state *) &(dfs->dfs_ar_state);
ATH_ARQ_LOCK(dfs);
empty = STAILQ_EMPTY(&(dfs->dfs_arq));
ATH_ARQ_UNLOCK(dfs);
while (!empty) {
ATH_ARQ_LOCK(dfs);
re = STAILQ_FIRST(&(dfs->dfs_arq));
if (re != NULL)
STAILQ_REMOVE_HEAD(&(dfs->dfs_arq), re_list);
ATH_ARQ_UNLOCK(dfs);
if (re == NULL)
return;
thistimestamp = re->re_ts;
rssi = re->re_rssi;
width = re->re_dur;
/* Return the dfs event to the free event list */
OS_MEMZERO(re, sizeof(struct dfs_event));
ATH_DFSEVENTQ_LOCK(dfs);
STAILQ_INSERT_TAIL(&(dfs->dfs_eventq), re, re_list);
ATH_DFSEVENTQ_UNLOCK(dfs);
/* determine if current radar is an extension of previous radar */
if (ar->ar_prevwidth == 255) {
/* tag on previous width for consideraion of low data rate ACKs */
ar->ar_prevwidth += width;
width = (width == 255) ? 255 : ar->ar_prevwidth;
} else if ((width == 255) &&
(ar->ar_prevwidth == 510 ||
ar->ar_prevwidth == 765 ||
ar->ar_prevwidth == 1020)) {
/* Aggregate up to 5 consecuate max radar widths
* to consider 11Mbps long preamble 1500-byte pkts
*/
ar->ar_prevwidth += width;
} else if (ar->ar_prevwidth == 1275 && width != 255) {
/* Found 5th consecute maxed out radar, reset history */
width += ar->ar_prevwidth;
ar->ar_prevwidth = 0;
} else if (ar->ar_prevwidth > 255) {
/* Ignore if there are less than 5 consecutive maxed out radars */
ar->ar_prevwidth = width;
width = 255;
} else {
ar->ar_prevwidth = width;
}
/* For ignoring noises with radar duration in ranges of 3-30: AP4x */
if ((width >= 257 && width <= 278) || /* Region 7 - 5.5Mbps (long pre) ACK = 270 = 216 us */
(width >= 295 && width <= 325) || /* Region 8 - 2Mbps (long pre) ACKC = 320 = 256us */
(width >= 1280 && width <= 1300)) {
u_int16_t wraparoundadj=0;
u_int16_t base = (width >= 1280) ? 1275 : 255;
if (thistimestamp < ar->ar_prevtimestamp) {
wraparoundadj = 32768;
}
if ((thistimestamp + wraparoundadj - ar->ar_prevtimestamp) !=
(width - base)) {
width = 1;
}
}
if (width <= 10) {
ATH_ARQ_LOCK(dfs);
empty = STAILQ_EMPTY(&(dfs->dfs_arq));
ATH_ARQ_UNLOCK(dfs);
continue;
}
/*
* Overloading the width=2 in: Store a count of radars w/max duration
* and high RSSI (not noise)
*/
if ((width == 255) && (rssi > DFS_AR_RSSI_THRESH_STRONG_PKTS))
width = 2;
/*
* Overloading the width=3 bin:
* Double and store a count of rdars of durtaion that matches 11Mbps (long preamble)
* TCP ACKs or 1500-byte data packets
*/
if ((width >= 1280 && width <= 1300) ||
(width >= 318 && width <= 325)) {
width = 3;
ar->ar_phyerrcount[3] += 2;
ar->ar_acksum += 2;
}
/* build histogram of radar duration */
if (width > 0 && width <= 510)
ar->ar_phyerrcount[width]++;
else {
/* invalid radar width, throw it away */
ATH_ARQ_LOCK(dfs);
empty = STAILQ_EMPTY(&(dfs->dfs_arq));
ATH_ARQ_UNLOCK(dfs);
continue;
}
/* Received radar of interest (i.e., signature match), proceed to check if
* there is enough neighboring traffic to drop out of Turbo
*/
if ((width >= 33 && width <= 38) || /* Region 0: 24Mbps ACK = 35 = 28us */
(width >= 39 && width <= 44) || /* Region 1: 12Mbps ACK = 40 = 32us */
(width >= 53 && width <= 58) || /* Region 2: 6Mbps ACK = 55 = 44us */
(width >= 126 && width <= 140) || /* Region 3: 11Mbps ACK = 135 = 108us */
(width >= 141 && width <= 160) || /* Region 4: 5.5Mbps ACK = 150 = 120us */
(width >= 189 && width <= 210) || /* Region 5: 2Mbps ACK = 200 = 160us */
(width >= 360 && width <= 380) || /* Region 6 1Mbps ACK = 400 = 320us */
(width >= 257 && width <= 270) || /* Region 7 5.5Mbps (Long Pre) ACK = 270 = 216us */
(width >= 295 && width <= 302) || /* Region 8 2Mbps (Long Pre) ACK = 320 = 256us */
/* Ignoring Region 9 due to overlap with 255 which is same as board noise */
/* Region 9 11Mbps (Long Pre) ACK = 255 = 204us */
(width == 3)) {
ar->ar_acksum++;
/* double the count for strong radars that match one of the ACK signatures */
if (rssi > DFS_AR_RSSI_DOUBLE_THRESHOLD) {
ar->ar_phyerrcount[width]++;
ar->ar_acksum++;
}
UPDATE_TOP_THREE_PEAKS(ar->ar_phyerrcount,
ar->ar_peaklist, width);
/* sum the counts of these peaks */
numpeaks = DFS_AR_MAX_NUM_PEAKS;
origregionsum = ar->ar_acksum;
for (i = 0; i < DFS_AR_MAX_NUM_PEAKS; i++) {
if (ar->ar_peaklist[i] > 0) {
if ((i==0) &&
(ar->ar_peaklist[i] == 3) &&
(ar->ar_phyerrcount[3] <
ar->ar_phyerrcount[2]) &&
(ar->ar_phyerrcount[3] > 6)) {
/*
* If the top peak is one that
* maches the 11Mbps long
* preamble TCP Ack/1500-byte
* data, include the count for
* radars that hav emax
* duration and high rssi
* (width = 2) to boost the
* sum for the PAR test that
* follows */
sumpeak += (ar->ar_phyerrcount[2]
+ ar->ar_phyerrcount[3]);
ar->ar_acksum += (ar->ar_phyerrcount[2]
+ ar->ar_phyerrcount[3]);
} else {
sumpeak += ar->ar_phyerrcount[ar->ar_peaklist[i]];
}
} else
numpeaks--;
}
/*
* If sum of patterns matches exceeds packet threshold,
* perform comparison between peak-to-avg ratio against parThreshold
*/
if ((ar->ar_acksum > ar->ar_packetthreshold) &&
((sumpeak * DFS_AR_REGION_WIDTH) > (ar->ar_parthreshold * numpeaks *
ar->ar_acksum))) {
/* neighboring traffic detected, get out of Turbo */
chan->priv_flags |= CHANNEL_INTERFERENCE;
OS_MEMZERO(ar->ar_peaklist, sizeof(ar->ar_peaklist));
ar->ar_acksum = 0;
OS_MEMZERO(ar->ar_phyerrcount, sizeof(ar->ar_phyerrcount));
} else {
/*
* reset sum of matches to discount the count of
* strong radars with max duration
*/
ar->ar_acksum = origregionsum;
}
}
ar->ar_prevtimestamp = thistimestamp;
ATH_ARQ_LOCK(dfs);
empty = STAILQ_EMPTY(&(dfs->dfs_arq));
ATH_ARQ_UNLOCK(dfs);
}
}
static void
ath_AR_event(struct net_device *dev, const struct ath_desc *ds,
struct sk_buff *skb)
{
struct ath_softc *sc = dev->priv;
struct ath_phyerr_state *pe;
u_int32_t sumPeak=0,numPeaks,rssi,width,origRegionSum=0, i;
u_int16_t thisTimeStamp;
KASSERT(sc->sc_phyerr_state != NULL,
("NULL phyerr_state"));
pe = (struct ath_phyerr_state *) sc->sc_phyerr_state;
thisTimeStamp =(u_int16_t) ds->ds_rxstat.rs_tstamp;
rssi = ds->ds_rxstat.rs_rssi;
width = ds->ds_rxstat.rs_datalen ?
(u_int32_t)(*((u_int8_t *) skb->data)) : 0;
width &= 0xff; /* Only lower 8 bits are valid */
/* determine if current radar is an extension of previous radar */
if (pe->pe_arState.ar_prevWidth == 255) {
/* tag on previous width for consideraion of low data rate ACKs */
pe->pe_arState.ar_prevWidth += width;
width = (width == 255) ? 255 : pe->pe_arState.ar_prevWidth;
} else if ((width == 255) &&
(pe->pe_arState.ar_prevWidth == 510 ||
pe->pe_arState.ar_prevWidth == 765 ||
pe->pe_arState.ar_prevWidth == 1020)) {
/* Aggregate up to 5 consecuate max radar widths
* to consider 11Mbps long preamble 1500-byte pkts
*/
pe->pe_arState.ar_prevWidth += width;
} else if (pe->pe_arState.ar_prevWidth == 1275 && width != 255) {
/* Found 5th consecute maxed out radar, reset history */
width += pe->pe_arState.ar_prevWidth;
pe->pe_arState.ar_prevWidth = 0;
} else if (pe->pe_arState.ar_prevWidth > 255) {
/* Ignore if there are less than 5 consecutive maxed out radars */
pe->pe_arState.ar_prevWidth = width;
width = 255;
} else {
pe->pe_arState.ar_prevWidth = width;
}
/* For ignoring noises with radar duration in ranges of 3-30: AP4x */
if ((width >= 257 && width <= 278) || /* Region 7 - 5.5Mbps (long pre) ACK = 270 = 216 us */
(width >= 295 && width <= 325) || /* Region 8 - 2Mbps (long pre) ACKC = 320 = 256us */
(width >= 1280 && width <= 1300)) {
u_int16_t wrapAroundAdj=0;
u_int16_t base = (width >= 1280) ? 1275 : 255;
if (thisTimeStamp < pe->pe_arState.ar_prevTimeStamp) {
wrapAroundAdj = 32768;
}
if ((thisTimeStamp + wrapAroundAdj - pe->pe_arState.ar_prevTimeStamp) !=
(width - base)) {
width = 1;
}
}
if (width <= 10)
return;
/*
* Overloading the width=2 in: Store a count of radars w/max duration
* and high RSSI (not noise)
*/
if ((width == 255) && (rssi > ATH_AR_RSSI_THRESH_STRONG_PKTS))
width = 2;
/*
* Overloading the width=3 bin:
* Double and store a count of rdars of durtaion that matches 11Mbps (long preamble)
* TCP ACKs or 1500-byte data packets
*/
if ((width >= 1280 && width <= 1300) ||
(width >= 318 && width <= 325)) {
width = 3;
pe->pe_arState.ar_phyErrCount[3] += 2;
pe->pe_arState.ar_ackSum += 2;
}
/* build histogram of radar duration */
if (width > 0 && width <= 510)
pe->pe_arState.ar_phyErrCount[width]++;
else
/* invalid radar width, throw it away */
return;
/* Received radar of interest (i.e., signature match), proceed to check if
* there is enough neighboring traffic to drop out of Turbo
*/
if ((width >= 33 && width <= 38) || /* Region 0: 24Mbps ACK = 35 = 28us */
(width >= 39 && width <= 44) || /* Region 1: 12Mbps ACK = 40 = 32us */
(width >= 53 && width <= 58) || /* Region 2: 6Mbps ACK = 55 = 44us */
(width >= 126 && width <= 140) || /* Region 3: 11Mbps ACK = 135 = 108us */
(width >= 141 && width <= 160) || /* Region 4: 5.5Mbps ACK = 150 = 120us */
(width >= 189 && width <= 210) || /* Region 5: 2Mbps ACK = 200 = 160us */
(width >= 360 && width <= 380) || /* Region 6 1Mbps ACK = 400 = 320us */
(width >= 257 && width <= 270) || /* Region 7 5.5Mbps (Long Pre) ACK = 270 = 216us */
(width >= 295 && width <= 302) || /* Region 8 2Mbps (Long Pre) ACK = 320 = 256us */
/* Ignoring Region 9 due to overlap with 255 which is same as board noise */
/* Region 9 11Mbps (Long Pre) ACK = 255 = 204us */
(width == 3)) {
pe->pe_arState.ar_ackSum++;
/* double the count for strong radars that match one of the ACK signatures */
if (rssi > ATH_AR_RSSI_DOUBLE_THRESHOLD) {
pe->pe_arState.ar_phyErrCount[width]++;
pe->pe_arState.ar_ackSum++;
}
UPDATE_TOP_THREE_PEAKS(pe->pe_arState.ar_phyErrCount,
pe->pe_arState.ar_peakList, width);
/* sum the counts of these peaks */
numPeaks = ATH_MAX_NUM_PEAKS;
origRegionSum = pe->pe_arState.ar_ackSum;
for (i=0; i<= ATH_MAX_NUM_PEAKS; i++) {
if (pe->pe_arState.ar_peakList[i] > 0) {
if ((i==0) &&
(pe->pe_arState.ar_peakList[i] == 3) &&
(pe->pe_arState.ar_phyErrCount[3] <
pe->pe_arState.ar_phyErrCount[2]) &&
(pe->pe_arState.ar_phyErrCount[3] > 6)) {
/*
* If the top peak is one that
* maches the 11Mbps long
* preamble TCP Ack/1500-byte
* data, include the count for
* radars that hav emax
* duration and high rssi
* (width = 2) to boost the
* sum for the PAR test that
* follows */
sumPeak += (pe->pe_arState.ar_phyErrCount[2]
+ pe->pe_arState.ar_phyErrCount[3]);
pe->pe_arState.ar_ackSum += (pe->pe_arState.ar_phyErrCount[2]
+ pe->pe_arState.ar_phyErrCount[3]);
} else {
sumPeak += pe->pe_arState.ar_phyErrCount[pe->pe_arState.ar_peakList[i]];
}
} else
numPeaks--;
}
/*
* If sum of patterns matches exceeds packet threshold,
* perform comparison between peak-to-avg ratio against parThreshold
*/
if ((pe->pe_arState.ar_ackSum > pe->pe_arState.ar_packetThreshold) &&
((sumPeak * ATH_AR_REGION_WIDTH) > (pe->pe_arState.ar_parThreshold * numPeaks *
pe->pe_arState.ar_ackSum))) {
/* neighboring traffic detected, get out of Turbo */
sc->sc_curchan.channelFlags |= CHANNEL_AR;
memset(pe->pe_arState.ar_peakList, 0,
sizeof(pe->pe_arState.ar_peakList));
pe->pe_arState.ar_ackSum = 0;
memset(pe->pe_arState.ar_phyErrCount, 0,
sizeof(pe->pe_arState.ar_phyErrCount));
} else {
/*
* reset sum of matches to discount the count of
* strong radars with max duration
*/
pe->pe_arState.ar_ackSum = origRegionSum;
}
}
pe->pe_arState.ar_prevTimeStamp = thisTimeStamp;
}
