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DFS: Allow 80+80 MHz be configured for VHT

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This allows cases where neither 80 MHz segment requires DFS to be
configured. DFS CAC operation itself does not yet support 80+80, though,
so if either segment requires DFS, the AP cannot be brought up.

Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>
This commit is contained in:
Jouni Malinen 2014-10-09 14:25:55 +03:00 committed by Jouni Malinen
parent bc86d8c158
commit 4a274f487a
1 changed files with 54 additions and 16 deletions
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70
src/ap/dfs.c
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@ -18,10 +18,12 @@
#include "dfs.h"
static int dfs_get_used_n_chans(struct hostapd_iface *iface)
static int dfs_get_used_n_chans(struct hostapd_iface *iface, int *seg1)
{
int n_chans = 1;
*seg1 = 0;
if (iface->conf->ieee80211n && iface->conf->secondary_channel)
n_chans = 2;
@ -35,6 +37,10 @@ static int dfs_get_used_n_chans(struct hostapd_iface *iface)
case VHT_CHANWIDTH_160MHZ:
n_chans = 8;
break;
case VHT_CHANWIDTH_80P80MHZ:
n_chans = 4;
*seg1 = 4;
break;
default:
break;
}
@ -170,10 +176,10 @@ static int dfs_find_channel(struct hostapd_iface *iface,
{
struct hostapd_hw_modes *mode;
struct hostapd_channel_data *chan;
int i, channel_idx = 0, n_chans;
int i, channel_idx = 0, n_chans, n_chans1;
mode = iface->current_mode;
n_chans = dfs_get_used_n_chans(iface);
n_chans = dfs_get_used_n_chans(iface, &n_chans1);
wpa_printf(MSG_DEBUG, "DFS new chan checking %d channels", n_chans);
for (i = 0; i < mode->num_channels; i++) {
@ -246,12 +252,15 @@ static void dfs_adjust_vht_center_freq(struct hostapd_iface *iface,
/* Return start channel idx we will use for mode->channels[idx] */
static int dfs_get_start_chan_idx(struct hostapd_iface *iface)
static int dfs_get_start_chan_idx(struct hostapd_iface *iface, int *seg1_start)
{
struct hostapd_hw_modes *mode;
struct hostapd_channel_data *chan;
int channel_no = iface->conf->channel;
int res = -1, i;
int chan_seg1 = -1;
*seg1_start = -1;
/* HT40- */
if (iface->conf->ieee80211n && iface->conf->secondary_channel == -1)
@ -270,9 +279,15 @@ static int dfs_get_start_chan_idx(struct hostapd_iface *iface)
channel_no =
iface->conf->vht_oper_centr_freq_seg0_idx - 14;
break;
case VHT_CHANWIDTH_80P80MHZ:
channel_no =
iface->conf->vht_oper_centr_freq_seg0_idx - 6;
chan_seg1 =
iface->conf->vht_oper_centr_freq_seg1_idx - 6;
break;
default:
wpa_printf(MSG_INFO,
"DFS only VHT20/40/80/160 is supported now");
"DFS only VHT20/40/80/160/80+80 is supported now");
channel_no = -1;
break;
}
@ -288,6 +303,23 @@ static int dfs_get_start_chan_idx(struct hostapd_iface *iface)
}
}
if (res != -1 && chan_seg1 > -1) {
int found = 0;
/* Get idx for seg1 */
mode = iface->current_mode;
for (i = 0; i < mode->num_channels; i++) {
chan = &mode->channels[i];
if (chan->chan == chan_seg1) {
*seg1_start = i;
found = 1;
break;
}
}
if (!found)
res = -1;
}
if (res == -1) {
wpa_printf(MSG_DEBUG,
"DFS chan_idx seems wrong; num-ch: %d ch-no: %d conf-ch-no: %d 11n: %d sec-ch: %d vht-oper-width: %d",
@ -511,17 +543,17 @@ static int set_dfs_state(struct hostapd_iface *iface, int freq, int ht_enabled,
static int dfs_are_channels_overlapped(struct hostapd_iface *iface, int freq,
int chan_width, int cf1, int cf2)
{
int start_chan_idx;
int start_chan_idx, start_chan_idx1;
struct hostapd_hw_modes *mode;
struct hostapd_channel_data *chan;
int n_chans, i, j, frequency = freq, radar_n_chans = 1;
int n_chans, n_chans1, i, j, frequency = freq, radar_n_chans = 1;
u8 radar_chan;
int res = 0;
/* Our configuration */
mode = iface->current_mode;
start_chan_idx = dfs_get_start_chan_idx(iface);
n_chans = dfs_get_used_n_chans(iface);
start_chan_idx = dfs_get_start_chan_idx(iface, &start_chan_idx1);
n_chans = dfs_get_used_n_chans(iface, &n_chans1);
/* Check we are on DFS channel(s) */
if (!dfs_check_chans_radar(iface, start_chan_idx, n_chans))
@ -604,19 +636,20 @@ static unsigned int dfs_get_cac_time(struct hostapd_iface *iface,
int hostapd_handle_dfs(struct hostapd_iface *iface)
{
struct hostapd_channel_data *channel;
int res, n_chans, start_chan_idx;
int res, n_chans, n_chans1, start_chan_idx, start_chan_idx1;
int skip_radar = 0;
iface->cac_started = 0;
do {
/* Get start (first) channel for current configuration */
start_chan_idx = dfs_get_start_chan_idx(iface);
start_chan_idx = dfs_get_start_chan_idx(iface,
&start_chan_idx1);
if (start_chan_idx == -1)
return -1;
/* Get number of used channels, depend on width */
n_chans = dfs_get_used_n_chans(iface);
n_chans = dfs_get_used_n_chans(iface, &n_chans1);
/* Setup CAC time */
iface->dfs_cac_ms = dfs_get_cac_time(iface, start_chan_idx,
@ -928,20 +961,25 @@ int hostapd_dfs_nop_finished(struct hostapd_iface *iface, int freq,
int hostapd_is_dfs_required(struct hostapd_iface *iface)
{
int n_chans, start_chan_idx;
int n_chans, n_chans1, start_chan_idx, start_chan_idx1, res;
if (!iface->conf->ieee80211h || !iface->current_mode ||
iface->current_mode->mode != HOSTAPD_MODE_IEEE80211A)
return 0;
/* Get start (first) channel for current configuration */
start_chan_idx = dfs_get_start_chan_idx(iface);
start_chan_idx = dfs_get_start_chan_idx(iface, &start_chan_idx1);
if (start_chan_idx == -1)
return -1;
/* Get number of used channels, depend on width */
n_chans = dfs_get_used_n_chans(iface);
n_chans = dfs_get_used_n_chans(iface, &n_chans1);
/* Check if any of configured channels require DFS */
return dfs_check_chans_radar(iface, start_chan_idx, n_chans);
res = dfs_check_chans_radar(iface, start_chan_idx, n_chans);
if (res)
return res;
if (start_chan_idx1 >= 0 && n_chans1 > 0)
res = dfs_check_chans_radar(iface, start_chan_idx1, n_chans1);
return res;
}