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ACS: Introduce acs_get_bw_center_chan()

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When using 40/80/160 MHz bandwidth, instead of computing the index of
the segment center freq based on the selected channel, lets look it up
in the bw_desc[] table.

This is preparative work to allow selecting a primary channel which is
not the first of the segment.

Signed-off-by: Nicolas Escande <nico.escande@gmail.com>
This commit is contained in:
Nicolas Escande 2022-04-27 15:37:00 +02:00 committed by Jouni Malinen
parent ed8e13decc
commit 60e2934cbf
1 changed files with 27 additions and 6 deletions
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33
src/ap/acs.c
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@ -436,6 +436,21 @@ static bool acs_usable_bw_chan(const struct hostapd_channel_data *chan,
}
static int acs_get_bw_center_chan(int freq, enum bw_type bw)
{
unsigned int i = 0;
while (bw_desc[bw][i].first != -1) {
if (freq >= bw_desc[bw][i].first &&
freq <= bw_desc[bw][i].last)
return bw_desc[bw][i].center_chan;
i++;
}
return 0;
}
static int acs_survey_is_sufficient(struct freq_survey *survey)
{
if (!(survey->filled & SURVEY_HAS_NF)) {
@ -944,19 +959,26 @@ bw_selected:
static void acs_adjust_center_freq(struct hostapd_iface *iface)
{
int offset;
int center;
wpa_printf(MSG_DEBUG, "ACS: Adjusting VHT center frequency");
switch (hostapd_get_oper_chwidth(iface->conf)) {
case CONF_OPER_CHWIDTH_USE_HT:
offset = 2 * iface->conf->secondary_channel;
if (iface->conf->secondary_channel &&
iface->freq >= 2400 && iface->freq < 2500)
center = iface->conf->channel +
2 * iface->conf->secondary_channel;
else if (iface->conf->secondary_channel)
center = acs_get_bw_center_chan(iface->freq, ACS_BW40);
else
center = iface->conf->channel;
break;
case CONF_OPER_CHWIDTH_80MHZ:
offset = 6;
center = acs_get_bw_center_chan(iface->freq, ACS_BW80);
break;
case CONF_OPER_CHWIDTH_160MHZ:
offset = 14;
center = acs_get_bw_center_chan(iface->freq, ACS_BW160);
break;
default:
/* TODO: How can this be calculated? Adjust
@ -966,8 +988,7 @@ static void acs_adjust_center_freq(struct hostapd_iface *iface)
return;
}
hostapd_set_oper_centr_freq_seg0_idx(iface->conf,
iface->conf->channel + offset);
hostapd_set_oper_centr_freq_seg0_idx(iface->conf, center);
}