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Fix 40 MHz channel bringup with ACS on the 6 GHz band

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When AP is brought up in HE40/EHT40 with ACS, the AP comes up with 20
MHz bandwidth. It is expected to come up with 40 MHz bandwidth.

conf->secondary_channel does not hold the correct value and it leads to
choosing 20 MHz in hostapd_set_freq_params(). conf->secondary_channel is
filled using the hostapd config he_oper_centr_freq_seg0_idx. When AP is
configured to use ACS, the hostapd config he_oper_centr_freq_seg0_idx is
not valid as the channel is not known during bring up. So using the
config he_oper_centr_freq_seg0_idx to fill the conf->secondary_channel
does not work with ACS.

Use op_class to determine the bandwidth and based on the bandwidth fill
the conf->secondary_channel to address this ACS case.

Signed-off-by: Hari Chandrakanthan <quic_haric@quicinc.com>
This commit is contained in:
Hari Chandrakanthan 2023-04-19 17:35:11 +05:30 committed by Jouni Malinen
parent 8bc84fceeb
commit 927dbfb453
1 changed files with 3 additions and 4 deletions
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7
src/ap/hostapd.c Normal file → Executable file
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@ -1756,16 +1756,15 @@ static int configured_fixed_chan_to_freq(struct hostapd_iface *iface)
static void hostapd_set_6ghz_sec_chan(struct hostapd_iface *iface)
{
int bw, seg0;
int bw;
if (!is_6ghz_op_class(iface->conf->op_class))
return;
seg0 = hostapd_get_oper_centr_freq_seg0_idx(iface->conf);
bw = center_idx_to_bw_6ghz(seg0);
bw = op_class_to_bandwidth(iface->conf->op_class);
/* Assign the secondary channel if absent in config for
* bandwidths > 20 MHz */
if (bw > 0 && !iface->conf->secondary_channel) {
if (bw >= 40 && !iface->conf->secondary_channel) {
if (((iface->conf->channel - 1) / 4) % 2)
iface->conf->secondary_channel = -1;
else