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DFS: Rely on channel_type in dfs_downgrade_bandwidth()

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Add the capability to specify all 3 channel type possibilities in
dfs_downgrade_bandwidth(). This is a preliminary change to introduce
radar/CAC background detection support.

Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
This commit is contained in:
Lorenzo Bianconi 2022-03-06 20:34:10 +01:00 • committed by Jouni Malinen
parent b37bbcc390
commit effd6111b8
1 changed files with 15 additions and 17 deletions
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32
src/ap/dfs.c
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@ -969,7 +969,8 @@ int hostapd_dfs_pre_cac_expired(struct hostapd_iface *iface, int freq,
static struct hostapd_channel_data *
dfs_downgrade_bandwidth(struct hostapd_iface *iface, int *secondary_channel,
u8 *oper_centr_freq_seg0_idx,
u8 *oper_centr_freq_seg1_idx, int *skip_radar)
u8 *oper_centr_freq_seg1_idx,
enum dfs_channel_type *channel_type)
{
struct hostapd_channel_data *channel;
@ -977,23 +978,22 @@ dfs_downgrade_bandwidth(struct hostapd_iface *iface, int *secondary_channel,
channel = dfs_get_valid_channel(iface, secondary_channel,
oper_centr_freq_seg0_idx,
oper_centr_freq_seg1_idx,
*skip_radar ? DFS_AVAILABLE :
DFS_ANY_CHANNEL);
*channel_type);
if (channel) {
wpa_printf(MSG_DEBUG, "DFS: Selected channel: %d",
channel->chan);
return channel;
}
if (*skip_radar) {
*skip_radar = 0;
if (*channel_type != DFS_ANY_CHANNEL) {
*channel_type = DFS_ANY_CHANNEL;
} else {
int oper_chwidth;
oper_chwidth = hostapd_get_oper_chwidth(iface->conf);
if (oper_chwidth == CHANWIDTH_USE_HT)
break;
*skip_radar = 1;
*channel_type = DFS_AVAILABLE;
hostapd_set_oper_chwidth(iface->conf, oper_chwidth - 1);
}
}
@ -1011,7 +1011,7 @@ static int hostapd_dfs_start_channel_switch_cac(struct hostapd_iface *iface)
int secondary_channel;
u8 oper_centr_freq_seg0_idx = 0;
u8 oper_centr_freq_seg1_idx = 0;
int skip_radar = 0;
enum dfs_channel_type channel_type = DFS_ANY_CHANNEL;
int err = 1;
/* Radar detected during active CAC */
@ -1019,14 +1019,13 @@ static int hostapd_dfs_start_channel_switch_cac(struct hostapd_iface *iface)
channel = dfs_get_valid_channel(iface, &secondary_channel,
&oper_centr_freq_seg0_idx,
&oper_centr_freq_seg1_idx,
skip_radar ? DFS_AVAILABLE :
DFS_ANY_CHANNEL);
channel_type);
if (!channel) {
channel = dfs_downgrade_bandwidth(iface, &secondary_channel,
&oper_centr_freq_seg0_idx,
&oper_centr_freq_seg1_idx,
&skip_radar);
&channel_type);
if (!channel) {
wpa_printf(MSG_ERROR, "No valid channel available");
return err;
@ -1060,7 +1059,7 @@ static int hostapd_dfs_start_channel_switch(struct hostapd_iface *iface)
u8 oper_centr_freq_seg0_idx;
u8 oper_centr_freq_seg1_idx;
u8 new_vht_oper_chwidth;
int skip_radar = 1;
enum dfs_channel_type channel_type = DFS_AVAILABLE;
struct csa_settings csa_settings;
unsigned int i;
int err = 1;
@ -1085,14 +1084,13 @@ static int hostapd_dfs_start_channel_switch(struct hostapd_iface *iface)
* uniform spreading.
*/
if (iface->dfs_domain == HOSTAPD_DFS_REGION_ETSI)
skip_radar = 0;
channel_type = DFS_ANY_CHANNEL;
/* Perform channel switch/CSA */
channel = dfs_get_valid_channel(iface, &secondary_channel,
&oper_centr_freq_seg0_idx,
&oper_centr_freq_seg1_idx,
skip_radar ? DFS_AVAILABLE :
DFS_ANY_CHANNEL);
channel_type);
if (!channel) {
/*
@ -1100,11 +1098,11 @@ static int hostapd_dfs_start_channel_switch(struct hostapd_iface *iface)
* there is another channel where we can switch even if it
* requires to perform a CAC first.
*/
skip_radar = 0;
channel_type = DFS_ANY_CHANNEL;
channel = dfs_downgrade_bandwidth(iface, &secondary_channel,
&oper_centr_freq_seg0_idx,
&oper_centr_freq_seg1_idx,
&skip_radar);
&channel_type);
if (!channel) {
/*
* Toggle interface state to enter DFS state
@ -1115,7 +1113,7 @@ static int hostapd_dfs_start_channel_switch(struct hostapd_iface *iface)
return 0;
}
if (!skip_radar) {
if (channel_type == DFS_ANY_CHANNEL) {
iface->freq = channel->freq;
iface->conf->channel = channel->chan;
iface->conf->secondary_channel = secondary_channel;