[PATCH 1/4] hostapd: allow configuring driver to VHT

Johannes Berg johannes at sipsolutions.net
Fri Dec 28 09:32:29 EST 2012


From: Johannes Berg <johannes.berg at intel.com>

Signed-hostap: Johannes Berg <johannes.berg at intel.com>
---
 src/ap/ap_drv_ops.c          | 67 ++++++++++++++++++++++++++++++++++++++++----
 src/ap/ap_drv_ops.h          |  4 ++-
 src/ap/hostapd.c             |  6 +++-
 src/common/ieee802_11_defs.h |  6 ++++
 src/drivers/driver.h         |  9 ++++++
 5 files changed, 85 insertions(+), 7 deletions(-)

diff --git a/src/ap/ap_drv_ops.c b/src/ap/ap_drv_ops.c
index 02da25b..355df15 100644
--- a/src/ap/ap_drv_ops.c
+++ b/src/ap/ap_drv_ops.c
@@ -454,19 +454,76 @@ int hostapd_flush(struct hostapd_data *hapd)
 
 
 int hostapd_set_freq(struct hostapd_data *hapd, int mode, int freq,
-		     int channel, int ht_enabled, int sec_channel_offset)
+		     int channel, int ht_enabled, int vht_enabled,
+		     int sec_channel_offset, int vht_oper_chwidth,
+		     int center_segment0, int center_segment1)
 {
 	struct hostapd_freq_params data;
-	if (hapd->driver == NULL)
-		return 0;
-	if (hapd->driver->set_freq == NULL)
-		return 0;
+	int tmp;
+
 	os_memset(&data, 0, sizeof(data));
 	data.mode = mode;
 	data.freq = freq;
 	data.channel = channel;
 	data.ht_enabled = ht_enabled;
+	data.vht_enabled = vht_enabled;
 	data.sec_channel_offset = sec_channel_offset;
+	data.center_freq1 = freq + sec_channel_offset * 10;
+	data.center_freq2 = 0;
+	data.bandwidth = sec_channel_offset ? 40 : 20;
+
+	/*
+	 * This validation code is probably misplaced, maybe it should be
+	 * in src/ap/hw_features.c and check the hardware support as well.
+	 */
+	if (data.vht_enabled) switch (vht_oper_chwidth) {
+	case VHT_CHANWIDTH_USE_HT:
+		if (center_segment1)
+			return -1;
+		if (5000 + center_segment0 * 5 != data.center_freq1)
+			return -1;
+		break;
+	case VHT_CHANWIDTH_80P80MHZ:
+		if (center_segment1 == center_segment0 + 4 ||
+		    center_segment1 == center_segment0 - 4)
+			return -1;
+		data.center_freq2 = 5000 + center_segment1 * 5;
+		/* fall through */
+	case VHT_CHANWIDTH_80MHZ:
+		data.bandwidth = 80;
+		if (vht_oper_chwidth == 1 && center_segment1)
+			return -1;
+		if (vht_oper_chwidth == 3 && !center_segment1)
+			return -1;
+		if (!sec_channel_offset)
+			return -1;
+		/* primary 40 part must match the HT configuration */
+		tmp = (30 + freq - 5000 - center_segment0 * 5)/20;
+		tmp /= 2;
+		if (data.center_freq1 != 5000 +
+					 center_segment0 * 5 - 20 + 40 * tmp)
+			return -1;
+		data.center_freq1 = 5000 + center_segment0 * 5;
+		break;
+	case VHT_CHANWIDTH_160MHZ:
+		data.bandwidth = 160;
+		if (center_segment1)
+			return -1;
+		if (!sec_channel_offset)
+			return -1;
+		/* primary 40 part must match the HT configuration */
+		tmp = (70 + freq - 5000 - center_segment0 * 5)/20;
+		tmp /= 2;
+		if (data.center_freq1 != 5000 +
+					 center_segment0 * 5 - 60 + 40 * tmp)
+			return -1;
+		data.center_freq1 = 5000 + center_segment0 * 5;
+		break;
+	}
+	if (hapd->driver == NULL)
+		return 0;
+	if (hapd->driver->set_freq == NULL)
+		return 0;
 	return hapd->driver->set_freq(hapd->drv_priv, &data);
 }
 
diff --git a/src/ap/ap_drv_ops.h b/src/ap/ap_drv_ops.h
index 9c53b99..768a0ba 100644
--- a/src/ap/ap_drv_ops.h
+++ b/src/ap/ap_drv_ops.h
@@ -55,7 +55,9 @@ int hostapd_get_seqnum(const char *ifname, struct hostapd_data *hapd,
 		       const u8 *addr, int idx, u8 *seq);
 int hostapd_flush(struct hostapd_data *hapd);
 int hostapd_set_freq(struct hostapd_data *hapd, int mode, int freq,
-		     int channel, int ht_enabled, int sec_channel_offset);
+		     int channel, int ht_enabled, int vht_enabled,
+		     int sec_channel_offset, int vht_oper_chwidth,
+		     int center_segment0, int center_segment1);
 int hostapd_set_rts(struct hostapd_data *hapd, int rts);
 int hostapd_set_frag(struct hostapd_data *hapd, int frag);
 int hostapd_sta_set_flags(struct hostapd_data *hapd, u8 *addr,
diff --git a/src/ap/hostapd.c b/src/ap/hostapd.c
index cef9daf..92fda56 100644
--- a/src/ap/hostapd.c
+++ b/src/ap/hostapd.c
@@ -894,7 +894,11 @@ int hostapd_setup_interface_complete(struct hostapd_iface *iface, int err)
 		if (hostapd_set_freq(hapd, hapd->iconf->hw_mode, iface->freq,
 				     hapd->iconf->channel,
 				     hapd->iconf->ieee80211n,
-				     hapd->iconf->secondary_channel)) {
+				     hapd->iconf->ieee80211ac,
+				     hapd->iconf->secondary_channel,
+				     hapd->iconf->vht_oper_chwidth,
+				     hapd->iconf->vht_oper_centr_freq_seg0_idx,
+				     hapd->iconf->vht_oper_centr_freq_seg1_idx)) {
 			wpa_printf(MSG_ERROR, "Could not set channel for "
 				   "kernel driver");
 			return -1;
diff --git a/src/common/ieee802_11_defs.h b/src/common/ieee802_11_defs.h
index e873545..f72c0d4 100644
--- a/src/common/ieee802_11_defs.h
+++ b/src/common/ieee802_11_defs.h
@@ -712,6 +712,12 @@ struct ieee80211_vht_operation {
 #define VHT_CAP_RX_ANTENNA_PATTERN                  ((u32) BIT(28))
 #define VHT_CAP_TX_ANTENNA_PATTERN                  ((u32) BIT(29))
 
+/* VHT channel widths */
+#define VHT_CHANWIDTH_USE_HT	0
+#define VHT_CHANWIDTH_80MHZ	1
+#define VHT_CHANWIDTH_160MHZ	2
+#define VHT_CHANWIDTH_80P80MHZ	3
+
 #define OUI_MICROSOFT 0x0050f2 /* Microsoft (also used in Wi-Fi specs)
 				* 00:50:F2 */
 #define WPA_IE_VENDOR_TYPE 0x0050f201
diff --git a/src/drivers/driver.h b/src/drivers/driver.h
index 7ee71aa..62f621f 100644
--- a/src/drivers/driver.h
+++ b/src/drivers/driver.h
@@ -907,10 +907,19 @@ struct hostapd_freq_params {
 	int mode;
 	int freq;
 	int channel;
+	/* for HT */
 	int ht_enabled;
 	int sec_channel_offset; /* 0 = HT40 disabled, -1 = HT40 enabled,
 				 * secondary channel below primary, 1 = HT40
 				 * enabled, secondary channel above primary */
+
+	/* for VHT */
+	int vht_enabled;
+
+	/* valid for both HT and VHT, center_freq2 is non-zero
+	 * only for bandwidth 80 and an 80+80 channel */
+	int center_freq1, center_freq2;
+	int bandwidth;
 };
 
 enum wpa_driver_if_type {
-- 
1.8.0



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