[PATCH v6 4/4] hostapd: update TPE IE according to AFC

[Lorenzo Bianconi]

Update Transmit Power Envelope (TPE) IE according to the reply from AFC
coordinator on UNII-5 or UNII-7 6GHz bands.

Tested-by: Felix Fietkau <nbd at nbd.name>
Tested-by: Allen Ye <allen.ye at mediatek.com>
Signed-off-by: Lorenzo Bianconi <lorenzo at kernel.org>
---
 src/ap/afc.c        | 37 +++++++++++++++++++++++++++++++++++
 src/ap/hostapd.h    |  9 +++++++++
 src/ap/ieee802_11.c | 47 ++++++++++++++++++++++++++++-----------------
 3 files changed, 75 insertions(+), 18 deletions(-)

diff --git a/src/ap/afc.c b/src/ap/afc.c
index 21e1e17cb..053c8d267 100644
--- a/src/ap/afc.c
+++ b/src/ap/afc.c
@@ -994,3 +994,40 @@ void hostap_afc_disable_channels(struct hostapd_iface *iface)
 			   chan->freq);
 	}
 }
+
+
+int hostap_afc_get_chan_max_eirp_power(struct hostapd_iface *iface, bool psd,
+				       int *power)
+{
+	int i;
+
+	if (!he_reg_is_sp(iface->conf->he_6ghz_reg_pwr_type))
+		return -EINVAL;
+
+	if (!iface->afc.data_valid)
+		return -EINVAL;
+
+	if (psd) {
+		for (i = 0; i < iface->afc.num_freq_range; i++) {
+			struct afc_freq_range_elem *f;
+
+			f = &iface->afc.freq_range[i];
+			if (iface->freq >= f->low_freq &&
+			    iface->freq <= f->high_freq) {
+				*power = 2 * f->max_psd;
+				return 0;
+			}
+		}
+	} else {
+		for (i = 0; i < iface->afc.num_chan_info; i++) {
+			struct afc_chan_info_elem *c;
+
+			c = &iface->afc.chan_info_list[i];
+			if (c->chan == iface->conf->channel) {
+				*power = 2 * c->power;
+				return 0;
+			}
+		}
+	}
+	return -EINVAL;
+}
diff --git a/src/ap/hostapd.h b/src/ap/hostapd.h
index 88d111022..5e8e10449 100644
--- a/src/ap/hostapd.h
+++ b/src/ap/hostapd.h
@@ -740,10 +740,19 @@ struct hostapd_iface {
 
 /* hostapd.c */
 #ifdef CONFIG_AFC
+int hostap_afc_get_chan_max_eirp_power(struct hostapd_iface *iface, bool psd,
+				       int *power);
 int hostapd_afc_handle_request(struct hostapd_iface *iface);
 void hostapd_afc_stop(struct hostapd_iface *iface);
 void hostap_afc_disable_channels(struct hostapd_iface *iface);
 #else
+static inline int
+hostap_afc_get_chan_max_eirp_power(struct hostapd_iface *iface, bool psd,
+				   int *power)
+{
+	return -EINVAL;
+}
+
 static inline int hostapd_afc_handle_request(struct hostapd_iface *iface)
 {
 	return 1;
diff --git a/src/ap/ieee802_11.c b/src/ap/ieee802_11.c
index 54cff1038..852a9f188 100644
--- a/src/ap/ieee802_11.c
+++ b/src/ap/ieee802_11.c
@@ -7016,42 +7016,53 @@ u8 * hostapd_eid_txpower_envelope(struct hostapd_data *hapd, u8 *eid)
 	 */
 	if (is_6ghz_op_class(iconf->op_class)) {
 		enum max_tx_pwr_interpretation tx_pwr_intrpn;
+		int err, max_eirp_psd, max_eirp_power;
 
 		/* Same Maximum Transmit Power for all 20 MHz bands */
 		tx_pwr_count = 0;
 		tx_pwr_intrpn = REGULATORY_CLIENT_EIRP_PSD;
 
 		/* Default Transmit Power Envelope for Global Operating Class */
-		if (hapd->iconf->reg_def_cli_eirp_psd != -1)
-			tx_pwr = hapd->iconf->reg_def_cli_eirp_psd;
-		else
-			tx_pwr = REG_PSD_MAX_TXPOWER_FOR_DEFAULT_CLIENT * 2;
+		err = hostap_afc_get_chan_max_eirp_power(iface, true,
+							 &max_eirp_psd);
+		if (err < 0) {
+			if (hapd->iconf->reg_def_cli_eirp_psd != -1)
+				max_eirp_psd = hapd->iconf->reg_def_cli_eirp_psd;
+			else
+				max_eirp_psd = REG_PSD_MAX_TXPOWER_FOR_DEFAULT_CLIENT * 2;
+		}
 
 		eid = hostapd_add_tpe_info(eid, tx_pwr_count, tx_pwr_intrpn,
-					   REG_DEFAULT_CLIENT, tx_pwr);
+					   REG_DEFAULT_CLIENT, max_eirp_psd);
 
 		/* Indoor Access Point must include an additional TPE for
 		 * subordinate devices */
 		if (he_reg_is_indoor(iconf->he_6ghz_reg_pwr_type)) {
-			/* TODO: Extract PSD limits from channel data */
-			if (hapd->iconf->reg_sub_cli_eirp_psd != -1)
-				tx_pwr = hapd->iconf->reg_sub_cli_eirp_psd;
-			else
-				tx_pwr = REG_PSD_MAX_TXPOWER_FOR_SUBORDINATE_CLIENT * 2;
+			if (err < 0) {
+				/* non-AFC connection */
+				if (hapd->iconf->reg_sub_cli_eirp_psd != -1)
+					max_eirp_psd = hapd->iconf->reg_sub_cli_eirp_psd;
+				else
+					max_eirp_psd = REG_PSD_MAX_TXPOWER_FOR_SUBORDINATE_CLIENT * 2;
+			}
 			eid = hostapd_add_tpe_info(eid, tx_pwr_count,
 						   tx_pwr_intrpn,
 						   REG_SUBORDINATE_CLIENT,
-						   tx_pwr);
+						   max_eirp_psd);
 		}
 
-		if (iconf->reg_def_cli_eirp != -1 &&
-		    he_reg_is_sp(iconf->he_6ghz_reg_pwr_type))
-			eid = hostapd_add_tpe_info(
-				eid, tx_pwr_count, REGULATORY_CLIENT_EIRP,
-				REG_DEFAULT_CLIENT,
-				hapd->iconf->reg_def_cli_eirp);
+		if (hostap_afc_get_chan_max_eirp_power(iface, false,
+						       &max_eirp_power)) {
+			max_eirp_power = iconf->reg_def_cli_eirp;
+			if (max_eirp_power == -1 ||
+			    !he_reg_is_sp(iconf->he_6ghz_reg_pwr_type))
+				return eid;
+		}
 
-		return eid;
+		return hostapd_add_tpe_info(eid, tx_pwr_count,
+					    REGULATORY_CLIENT_EIRP,
+					    REG_DEFAULT_CLIENT,
+					    max_eirp_power);
 	}
 #endif /* CONFIG_IEEE80211AX */
 
-- 
2.45.0