HE: Make the basic NSS/MCS configurable

Add a config option to allow setting a custom Basic NSS/MCS set. As a
default we use single stream HE-MCS 0-7.

Signed-off-by: Shashidhar Lakkavalli <slakkavalli@datto.com>
Signed-off-by: John Crispin <john@phrozen.org>

hostapd/config_file.c

@@ -3508,6 +3508,8 @@ static int hostapd_config_fill(struct hostapd_config *conf,
 		conf->he_op.he_twt_required = atoi(pos);
 	} else if (os_strcmp(buf, "he_rts_threshold") == 0) {
 		conf->he_op.he_rts_threshold = atoi(pos);
+	} else if (os_strcmp(buf, "he_basic_mcs_nss_set") == 0) {
+		conf->he_op.he_basic_mcs_nss_set = atoi(pos);
 	} else if (os_strcmp(buf, "he_mu_edca_qos_info_param_count") == 0) {
 		conf->he_mu_edca.he_qos_info |=
 			set_he_cap(atoi(pos), HE_QOS_INFO_EDCA_PARAM_SET_COUNT);

hostapd/hostapd.conf

@@ -804,6 +804,12 @@ wmm_ac_vo_acm=0
 #he_oper_centr_freq_seg0_idx
 #he_oper_centr_freq_seg1_idx
 
+#he_basic_mcs_nss_set: Basic NSS/MCS set
+# 16-bit combination of 2-bit values of Max HE-MCS For 1..8 SS; each 2-bit
+# value having following meaning:
+# 0 = HE-MCS 0-7, 1 = HE-MCS 0-9, 2 = HE-MCS 0-11, 3 = not supported
+#he_basic_mcs_nss_set
+
 #he_mu_edca_qos_info_param_count
 #he_mu_edca_qos_info_q_ack
 #he_mu_edca_qos_info_queue_request=1

src/ap/ap_config.c

@@ -240,6 +240,8 @@ struct hostapd_config * hostapd_config_defaults(void)
 #ifdef CONFIG_IEEE80211AX
 	conf->he_op.he_rts_threshold = HE_OPERATION_RTS_THRESHOLD_MASK >>
 		HE_OPERATION_RTS_THRESHOLD_OFFSET;
+	/* Set default basic MCS/NSS set to single stream MCS 0-7 */
+	conf->he_op.he_basic_mcs_nss_set = 0xfffc;
 #endif /* CONFIG_IEEE80211AX */
 
 	/* The third octet of the country string uses an ASCII space character

src/ap/ap_config.h

@@ -750,6 +750,7 @@ struct he_operation {
 	u8 he_default_pe_duration;
 	u8 he_twt_required;
 	u16 he_rts_threshold;
+	u16 he_basic_mcs_nss_set;
 };
 
 /**

src/ap/ieee802_11_he.c

@@ -157,6 +157,10 @@ u8 * hostapd_eid_he_operation(struct hostapd_data *hapd, u8 *eid)
 		params |= (hapd->iface->conf->he_op.he_bss_color <<
 			   HE_OPERATION_BSS_COLOR_OFFSET);
 
+	/* HE minimum required basic MCS and NSS for STAs */
+	oper->he_mcs_nss_set =
+		host_to_le16(hapd->iface->conf->he_op.he_basic_mcs_nss_set);
+
 	/* TODO: conditional MaxBSSID Indicator subfield */
 
 	oper->he_oper_params = host_to_le32(params);

src/common/ieee802_11_defs.h

@@ -2115,7 +2115,7 @@ struct ieee80211_he_capabilities {
 struct ieee80211_he_operation {
 	le32 he_oper_params; /* HE Operation Parameters[3] and
 			      * BSS Color Information[1] */
-	u8 he_mcs_nss_set[2];
+	le16 he_mcs_nss_set;
 	u8 vht_op_info_chwidth;
 	u8 vht_op_info_chan_center_freq_seg0_idx;
 	u8 vht_op_info_chan_center_freq_seg1_idx;