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ACS: Add support for 160 MHz bandwidth

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Add support for 160 MHz BW channels to automatic channel selection
algorithm. Only 36 and 100 channels are supported as 160 MHz channels.

Signed-off-by: Dmitry Lebed <lebed.dmitry@gmail.com>
This commit is contained in:
Dmitry Lebed 2018-02-27 23:40:52 +03:00 committed by Jouni Malinen
parent 24451276a1
commit 22dcafc20c
1 changed files with 50 additions and 16 deletions
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66
src/ap/acs.c
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@ -362,7 +362,7 @@ acs_survey_chan_interference_factor(struct hostapd_iface *iface,
}
static int acs_usable_ht40_chan(struct hostapd_channel_data *chan)
static int acs_usable_ht40_chan(const struct hostapd_channel_data *chan)
{
const int allowed[] = { 36, 44, 52, 60, 100, 108, 116, 124, 132, 149,
157, 184, 192 };
@ -376,7 +376,7 @@ static int acs_usable_ht40_chan(struct hostapd_channel_data *chan)
}
static int acs_usable_vht80_chan(struct hostapd_channel_data *chan)
static int acs_usable_vht80_chan(const struct hostapd_channel_data *chan)
{
const int allowed[] = { 36, 52, 100, 116, 132, 149 };
unsigned int i;
@ -389,6 +389,19 @@ static int acs_usable_vht80_chan(struct hostapd_channel_data *chan)
}
static int acs_usable_vht160_chan(const struct hostapd_channel_data *chan)
{
const int allowed[] = { 36, 100 };
unsigned int i;
for (i = 0; i < ARRAY_SIZE(allowed); i++)
if (chan->chan == allowed[i])
return 1;
return 0;
}
static int acs_survey_is_sufficient(struct freq_survey *survey)
{
if (!(survey->filled & SURVEY_HAS_NF)) {
@ -579,16 +592,21 @@ acs_find_ideal_chan(struct hostapd_iface *iface)
iface->conf->secondary_channel)
n_chans = 2;
if (iface->conf->ieee80211ac &&
iface->conf->vht_oper_chwidth == 1)
n_chans = 4;
if (iface->conf->ieee80211ac) {
switch (iface->conf->vht_oper_chwidth) {
case VHT_CHANWIDTH_80MHZ:
n_chans = 4;
break;
case VHT_CHANWIDTH_160MHZ:
n_chans = 8;
break;
}
}
/* TODO: VHT80+80, VHT160. Update acs_adjust_vht_center_freq() too. */
/* TODO: VHT80+80. Update acs_adjust_vht_center_freq() too. */
wpa_printf(MSG_DEBUG, "ACS: Survey analysis for selected bandwidth %d MHz",
n_chans == 1 ? 20 :
n_chans == 2 ? 40 :
80);
n_chans * 20);
for (i = 0; i < iface->current_mode->num_channels; i++) {
double total_weight;
@ -614,12 +632,24 @@ acs_find_ideal_chan(struct hostapd_iface *iface)
}
if (iface->current_mode->mode == HOSTAPD_MODE_IEEE80211A &&
iface->conf->ieee80211ac &&
iface->conf->vht_oper_chwidth == 1 &&
!acs_usable_vht80_chan(chan)) {
wpa_printf(MSG_DEBUG, "ACS: Channel %d: not allowed as primary channel for VHT80",
chan->chan);
continue;
iface->conf->ieee80211ac) {
if (iface->conf->vht_oper_chwidth ==
VHT_CHANWIDTH_80MHZ &&
!acs_usable_vht80_chan(chan)) {
wpa_printf(MSG_DEBUG,
"ACS: Channel %d: not allowed as primary channel for VHT80",
chan->chan);
continue;
}
if (iface->conf->vht_oper_chwidth ==
VHT_CHANWIDTH_160MHZ &&
!acs_usable_vht160_chan(chan)) {
wpa_printf(MSG_DEBUG,
"ACS: Channel %d: not allowed as primary channel for VHT160",
chan->chan);
continue;
}
}
factor = 0;
@ -744,10 +774,14 @@ static void acs_adjust_vht_center_freq(struct hostapd_iface *iface)
case VHT_CHANWIDTH_80MHZ:
offset = 6;
break;
case VHT_CHANWIDTH_160MHZ:
offset = 14;
break;
default:
/* TODO: How can this be calculated? Adjust
* acs_find_ideal_chan() */
wpa_printf(MSG_INFO, "ACS: Only VHT20/40/80 is supported now");
wpa_printf(MSG_INFO,
"ACS: Only VHT20/40/80/160 is supported now");
return;
}