[PATCH v9 4/7] hostapd: Support 80/160/320 MHz widths in hostapd_is_usable_chans
Allen Ye
allen.ye at mediatek.com
Mon Dec 1 03:10:39 PST 2025
Update hostapd_is_usable_chans utility routine logic to take into
account 80MHz, 160MHz and 320MHz channel widths.
This is a preliminary patch to introduce AFC support.
Tested-by: Felix Fietkau <nbd at nbd.name>
Tested-by: Krishna Chaitanya <chaitanya.mgit at gmail.com>
Reviewed-by: Money Wang <money.wang at mediatek.com>
Signed-off-by: Allen Ye <allen.ye at mediatek.com>
---
src/ap/hw_features.c | 126 +++++++++++++++++++++++++++++++++----------
src/ap/hw_features.h | 7 +++
2 files changed, 105 insertions(+), 28 deletions(-)
diff --git a/src/ap/hw_features.c b/src/ap/hw_features.c
index 460b1d3ad..5d90a552f 100644
--- a/src/ap/hw_features.c
+++ b/src/ap/hw_features.c
@@ -1029,11 +1029,12 @@ static bool hostapd_is_usable_punct_bitmap(struct hostapd_iface *iface)
* 0 = not usable
* -1 = not currently usable due to 6 GHz NO-IR
*/
-static int hostapd_is_usable_chans(struct hostapd_iface *iface)
+int hostapd_is_usable_chans(struct hostapd_iface *iface)
{
- int secondary_freq;
struct hostapd_channel_data *pri_chan;
- int err, err2;
+ int err, central, oper_chwidth;
+ int start_chan, start_freq, chan_num, i;
+ bool is_24ghz, ht_chwidth, acs_80p80;
if (!iface->current_mode)
return 0;
@@ -1046,11 +1047,6 @@ static int hostapd_is_usable_chans(struct hostapd_iface *iface)
return 0;
}
- err = hostapd_is_usable_chan(iface, pri_chan->freq, 1);
- if (err <= 0) {
- wpa_printf(MSG_ERROR, "Primary frequency not allowed");
- return err;
- }
err = hostapd_is_usable_edmg(iface);
if (err <= 0)
return err;
@@ -1058,38 +1054,112 @@ static int hostapd_is_usable_chans(struct hostapd_iface *iface)
if (!hostapd_is_usable_punct_bitmap(iface))
return 0;
- if (!iface->conf->secondary_channel)
- return 1;
+ oper_chwidth = hostapd_get_oper_chwidth(iface->conf);
+ central = hostapd_get_oper_centr_freq_seg0_idx(iface->conf);
+
+ is_24ghz = (iface->current_mode->mode <= HOSTAPD_MODE_IEEE80211G);
+ ht_chwidth = (oper_chwidth == CONF_OPER_CHWIDTH_USE_HT);
+ /*
+ * The central channel is not filled in acs_adjust_center_freq() after
+ * ACS of 80p80. In the case we only check the primary 40 MHz
+ */
+ acs_80p80 = (oper_chwidth == CONF_OPER_CHWIDTH_80P80MHZ && !central);
+ if (is_24ghz || ht_chwidth || acs_80p80) {
+ int secondary_freq, err2;
+
+ err = hostapd_is_usable_chan(iface, iface->freq, 0);
+ if (err <= 0 || !iface->conf->secondary_channel)
+ return err;
+
+ secondary_freq =
+ iface->freq + iface->conf->secondary_channel * 20;
+ err = hostapd_is_usable_chan(iface, secondary_freq, 0);
+
+ if (err > 0) {
+ if (iface->conf->secondary_channel == 1 &&
+ (pri_chan->allowed_bw & HOSTAPD_CHAN_WIDTH_40P))
+ return 1;
+ if (iface->conf->secondary_channel == -1 &&
+ (pri_chan->allowed_bw & HOSTAPD_CHAN_WIDTH_40M))
+ return 1;
+ err = 0;
+ }
+
+ if (!iface->conf->ht40_plus_minus_allowed)
+ return err;
+
+ /* Both HT40+ and HT40- are set, check the other secondary 40 */
+ secondary_freq =
+ iface->freq - iface->conf->secondary_channel * 20;
+ err2 = hostapd_is_usable_chan(iface, secondary_freq, 0);
+ if (err2 <= 0)
+ return err;
- err = hostapd_is_usable_chan(iface, iface->freq +
- iface->conf->secondary_channel * 20, 0);
- if (err > 0) {
if (iface->conf->secondary_channel == 1 &&
- (pri_chan->allowed_bw & HOSTAPD_CHAN_WIDTH_40P))
+ (pri_chan->allowed_bw & HOSTAPD_CHAN_WIDTH_40M)) {
+ iface->conf->secondary_channel = -1;
return 1;
+ }
+
if (iface->conf->secondary_channel == -1 &&
- (pri_chan->allowed_bw & HOSTAPD_CHAN_WIDTH_40M))
+ (pri_chan->allowed_bw & HOSTAPD_CHAN_WIDTH_40P)) {
+ iface->conf->secondary_channel = 1;
return 1;
- }
- if (!iface->conf->ht40_plus_minus_allowed)
+ }
return err;
+ }
- /* Both HT40+ and HT40- are set, pick a valid secondary channel */
- secondary_freq = iface->freq + 20;
- err2 = hostapd_is_usable_chan(iface, secondary_freq, 0);
- if (err2 > 0 && (pri_chan->allowed_bw & HOSTAPD_CHAN_WIDTH_40P)) {
- iface->conf->secondary_channel = 1;
- return 1;
+ switch (oper_chwidth) {
+ case CONF_OPER_CHWIDTH_80MHZ:
+ case CONF_OPER_CHWIDTH_80P80MHZ:
+ chan_num = 4;
+ break;
+ case CONF_OPER_CHWIDTH_160MHZ:
+ chan_num = 8;
+ break;
+ case CONF_OPER_CHWIDTH_320MHZ:
+ chan_num = 16;
+ break;
+ default:
+ return 0;
}
+ start_chan = central - chan_num * 2 + 2;
+ start_freq = hw_get_freq(iface->current_mode, start_chan);
- secondary_freq = iface->freq - 20;
- err2 = hostapd_is_usable_chan(iface, secondary_freq, 0);
- if (err2 > 0 && (pri_chan->allowed_bw & HOSTAPD_CHAN_WIDTH_40M)) {
- iface->conf->secondary_channel = -1;
+ if (!start_freq) {
+ wpa_printf(MSG_ERROR, "frequency not present");
+ return 0;
+ }
+
+ for (i = 0; i < chan_num; i++) {
+ int freq = start_freq + i * 20;
+
+ err = hostapd_is_usable_chan(iface, freq, 0);
+ if (err <= 0) {
+ wpa_printf(MSG_ERROR, "frequency %d is not allowed",
+ freq);
+ return err;
+ }
+ }
+
+ if (oper_chwidth != CONF_OPER_CHWIDTH_80P80MHZ)
return 1;
+
+ central = hostapd_get_oper_centr_freq_seg1_idx(iface->conf);
+ start_chan = central - chan_num * 2 + 2;
+ start_freq = hw_get_freq(iface->current_mode, start_chan);
+ for (i = 0; i < chan_num; i++) {
+ int freq = start_freq + i * 20;
+
+ err = hostapd_is_usable_chan(iface, freq, 0);
+ if (err <= 0) {
+ wpa_printf(MSG_ERROR, "frequency %d is not allowed",
+ freq);
+ return err;
+ }
}
- return err;
+ return 1;
}
diff --git a/src/ap/hw_features.h b/src/ap/hw_features.h
index 73663d0af..d4953e8ba 100644
--- a/src/ap/hw_features.h
+++ b/src/ap/hw_features.h
@@ -32,6 +32,7 @@ int hostapd_hw_skip_mode(struct hostapd_iface *iface,
int hostapd_determine_mode(struct hostapd_iface *iface);
void hostapd_free_multi_hw_info(struct hostapd_multi_hw_info *multi_hw_info);
int hostapd_set_current_hw_info(struct hostapd_iface *iface, int oper_freq);
+int hostapd_is_usable_chans(struct hostapd_iface *iface);
#else /* NEED_AP_MLME */
static inline void
hostapd_free_hw_features(struct hostapd_hw_modes *hw_features,
@@ -115,6 +116,12 @@ static inline int hostapd_set_current_hw_info(struct hostapd_iface *iface,
{
return 0;
}
+
+static inline int hostapd_is_usable_chans(struct hostapd_iface *iface)
+{
+ return 1;
+}
+
#endif /* NEED_AP_MLME */
#endif /* HW_FEATURES_H */
--
2.45.2
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