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P2P: Add support for automatic channel selection at GO

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The driver wrapper may now indicate the preferred channel (e.g., based
on scan results) on both 2.4 GHz and 5 GHz bands (and an overall best
frequency). When setting up a GO, this preference information is used
to select the operating channel if configuration does not include
hardcoded channel. Similarly, this information can be used during
GO Negotiation to indicate preference for a specific channel based
on current channel conditions.

p2p_group_add command can now use special values (freq=2 and freq=5)
to indicate that the GO is to be started on the specified band.
This commit is contained in:
Anil Gathala Sudha 2010-11-10 13:33:47 +02:00 committed by Jouni Malinen
parent bacc31286c
commit 7cfc4ac319
8 changed files with 215 additions and 17 deletions
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25
src/drivers/driver.h
View file

@ -2229,7 +2229,16 @@ enum wpa_event_type {
* resource conflicts could also trigger this for station mode
* interfaces.
*/
EVENT_INTERFACE_UNAVAILABLE
EVENT_INTERFACE_UNAVAILABLE,
/**
* EVENT_BEST_CHANNEL
*
* Driver generates this event whenever it detects a better channel
* (e.g., based on RSSI or channel use). This information can be used
* to improve channel selection for a new AP/P2P group.
*/
EVENT_BEST_CHANNEL
};
@ -2649,6 +2658,20 @@ union wpa_event_data {
int current_noise;
int current_txrate;
} signal_change;
/**
* struct best_channel - Data for EVENT_BEST_CHANNEL events
* @freq_24: Best 2.4 GHz band channel frequency in MHz
* @freq_5: Best 5 GHz band channel frequency in MHz
* @freq_overall: Best channel frequency in MHz
*
* 0 can be used to indicate no preference in either band.
*/
struct best_channel {
int freq_24;
int freq_5;
int freq_overall;
} best_chan;
};
/**

51
src/p2p/p2p.c
View file

@ -852,15 +852,53 @@ static int p2p_prepare_channel(struct p2p_data *p2p, unsigned int force_freq)
p2p->channels.reg_class[0].channels = 1;
p2p->channels.reg_class[0].reg_class = p2p->op_reg_class;
p2p->channels.reg_class[0].channel[0] = p2p->op_channel;
} else {
u8 op_reg_class, op_channel;
if (!p2p->cfg->cfg_op_channel && p2p->best_freq_overall > 0 &&
p2p_supported_freq(p2p, p2p->best_freq_overall) &&
p2p_freq_to_channel(p2p->cfg->country,
p2p->best_freq_overall,
&op_reg_class, &op_channel) == 0) {
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
"P2P: Select best overall channel as "
"operating channel preference");
p2p->op_reg_class = op_reg_class;
p2p->op_channel = op_channel;
} else if (!p2p->cfg->cfg_op_channel && p2p->best_freq_5 > 0 &&
p2p_supported_freq(p2p, p2p->best_freq_5) &&
p2p_freq_to_channel(p2p->cfg->country,
p2p->best_freq_5,
&op_reg_class, &op_channel) ==
0) {
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
"P2P: Select best 5 GHz channel as "
"operating channel preference");
p2p->op_reg_class = op_reg_class;
p2p->op_channel = op_channel;
} else if (!p2p->cfg->cfg_op_channel &&
p2p->best_freq_24 > 0 &&
p2p_supported_freq(p2p, p2p->best_freq_24) &&
p2p_freq_to_channel(p2p->cfg->country,
p2p->best_freq_24,
&op_reg_class, &op_channel) ==
0) {
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
"P2P: Select best 2.4 GHz channel as "
"operating channel preference");
p2p->op_reg_class = op_reg_class;
p2p->op_channel = op_channel;
} else {
p2p->op_reg_class = p2p->cfg->op_reg_class;
p2p->op_channel = p2p->cfg->op_channel;
}
os_memcpy(&p2p->channels, &p2p->cfg->channels,
sizeof(struct p2p_channels));
}
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
"P2P: Own preference for operation channel: "
"Regulatory Class %u Channel %u%s",
"Operating Class %u Channel %u%s",
p2p->op_reg_class, p2p->op_channel,
force_freq ? " (forced)" : "");
@ -3133,3 +3171,14 @@ int p2p_send_action(struct p2p_data *p2p, unsigned int freq, const u8 *dst,
return p2p->cfg->send_action(p2p->cfg->cb_ctx, freq, dst, src, bssid,
buf, len, wait_time);
}
void p2p_set_best_channels(struct p2p_data *p2p, int freq_24, int freq_5,
int freq_overall)
{
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Best channel: 2.4 GHz: %d,"
" 5 GHz: %d, overall: %d", freq_24, freq_5, freq_overall);
p2p->best_freq_24 = freq_24;
p2p->best_freq_5 = freq_5;
p2p->best_freq_overall = freq_overall;
}

15
src/p2p/p2p.h
View file

@ -170,6 +170,11 @@ struct p2p_config {
*/
u8 op_channel;
/**
* cfg_op_channel - Whether op_channel is hardcoded in configuration
*/
u8 cfg_op_channel;
/**
* channels - Own supported regulatory classes and channels
*
@ -1294,4 +1299,14 @@ int p2p_supported_freq(struct p2p_data *p2p, unsigned int freq);
void p2p_update_channel_list(struct p2p_data *p2p, struct p2p_channels *chan);
/**
* p2p_set_best_channels - Update best channel information
* @p2p: P2P module context from p2p_init()
* @freq_24: Frequency (MHz) of best channel in 2.4 GHz band
* @freq_5: Frequency (MHz) of best channel in 5 GHz band
* @freq_overall: Frequency (MHz) of best channel overall
*/
void p2p_set_best_channels(struct p2p_data *p2p, int freq_24, int freq_5,
int freq_overall);
#endif /* P2P_H */

4
src/p2p/p2p_i.h
View file

@ -383,6 +383,10 @@ struct p2p_data {
u8 peer_filter[ETH_ALEN];
int cross_connect;
int best_freq_24;
int best_freq_5;
int best_freq_overall;
};
/**

13
wpa_supplicant/events.c
View file

@ -1874,6 +1874,19 @@ void wpa_supplicant_event(void *ctx, enum wpa_event_type event,
case EVENT_INTERFACE_UNAVAILABLE:
#ifdef CONFIG_P2P
wpas_p2p_interface_unavailable(wpa_s);
#endif /* CONFIG_P2P */
break;
case EVENT_BEST_CHANNEL:
wpa_printf(MSG_DEBUG, "Best channel event received (%d %d %d)",
data->best_chan.freq_24, data->best_chan.freq_5,
data->best_chan.freq_overall);
wpa_s->best_24_freq = data->best_chan.freq_24;
wpa_s->best_5_freq = data->best_chan.freq_5;
wpa_s->best_overall_freq = data->best_chan.freq_overall;
#ifdef CONFIG_P2P
wpas_p2p_update_best_channels(wpa_s, data->best_chan.freq_24,
data->best_chan.freq_5,
data->best_chan.freq_overall);
#endif /* CONFIG_P2P */
break;
default:

111
wpa_supplicant/p2p_supplicant.c
View file

@ -2203,23 +2203,28 @@ int wpas_p2p_init(struct wpa_global *global, struct wpa_supplicant *wpa_s)
os_get_random((u8 *) &r, sizeof(r));
p2p.channel = 1 + (r % 3) * 5;
}
wpa_printf(MSG_DEBUG, "P2P: Own listen channel: %d", p2p.channel);
if (wpa_s->conf->p2p_oper_reg_class &&
wpa_s->conf->p2p_oper_channel) {
p2p.op_reg_class = wpa_s->conf->p2p_oper_reg_class;
p2p.op_channel = wpa_s->conf->p2p_oper_channel;
p2p.cfg_op_channel = 1;
wpa_printf(MSG_DEBUG, "P2P: Configured operating channel: "
"%d:%d", p2p.op_reg_class, p2p.op_channel);
} else {
p2p.op_reg_class = 81;
/*
* For initial tests, pick the operation channel randomly.
* TODO: Use scan results (etc.) to select the best channel.
* Use random operation channel from (1, 6, 11) if no other
* preference is indicated.
*/
os_get_random((u8 *) &r, sizeof(r));
p2p.op_channel = 1 + r % 11;
p2p.op_channel = 1 + (r % 3) * 5;
p2p.cfg_op_channel = 0;
wpa_printf(MSG_DEBUG, "P2P: Random operating channel: "
"%d:%d", p2p.op_reg_class, p2p.op_channel);
}
wpa_printf(MSG_DEBUG, "P2P: Own listen channel: %d "
"Own preferred operation channel: %d",
p2p.channel, p2p.op_channel);
if (wpa_s->conf->country[0] && wpa_s->conf->country[1]) {
os_memcpy(p2p.country, wpa_s->conf->country, 2);
p2p.country[2] = 0x04;
@ -2865,16 +2870,48 @@ static void wpas_p2p_init_go_params(struct wpa_supplicant *wpa_s,
os_memset(params, 0, sizeof(*params));
params->role_go = 1;
params->freq = 2412;
if (freq)
if (freq) {
wpa_printf(MSG_DEBUG, "P2P: Set GO freq based on forced "
"frequency %d MHz", freq);
params->freq = freq;
else if (wpa_s->conf->p2p_oper_reg_class == 81 &&
} else if (wpa_s->conf->p2p_oper_reg_class == 81 &&
wpa_s->conf->p2p_oper_channel >= 1 &&
wpa_s->conf->p2p_oper_channel <= 11)
wpa_s->conf->p2p_oper_channel <= 11) {
params->freq = 2407 + 5 * wpa_s->conf->p2p_oper_channel;
else if (wpa_s->conf->p2p_oper_reg_class == 115 ||
wpa_s->conf->p2p_oper_reg_class == 118)
wpa_printf(MSG_DEBUG, "P2P: Set GO freq based on configured "
"frequency %d MHz", params->freq);
} else if (wpa_s->conf->p2p_oper_reg_class == 115 ||
wpa_s->conf->p2p_oper_reg_class == 118) {
params->freq = 5000 + 5 * wpa_s->conf->p2p_oper_channel;
wpa_printf(MSG_DEBUG, "P2P: Set GO freq based on configured "
"frequency %d MHz", params->freq);
} else if (wpa_s->conf->p2p_oper_channel == 0 &&
wpa_s->best_overall_freq > 0 &&
p2p_supported_freq(wpa_s->global->p2p,
wpa_s->best_overall_freq)) {
params->freq = wpa_s->best_overall_freq;
wpa_printf(MSG_DEBUG, "P2P: Set GO freq based on best overall "
"channel %d MHz", params->freq);
} else if (wpa_s->conf->p2p_oper_channel == 0 &&
wpa_s->best_24_freq > 0 &&
p2p_supported_freq(wpa_s->global->p2p,
wpa_s->best_24_freq)) {
params->freq = wpa_s->best_24_freq;
wpa_printf(MSG_DEBUG, "P2P: Set GO freq based on best 2.4 GHz "
"channel %d MHz", params->freq);
} else if (wpa_s->conf->p2p_oper_channel == 0 &&
wpa_s->best_5_freq > 0 &&
p2p_supported_freq(wpa_s->global->p2p,
wpa_s->best_5_freq)) {
params->freq = wpa_s->best_5_freq;
wpa_printf(MSG_DEBUG, "P2P: Set GO freq based on best 5 GHz "
"channel %d MHz", params->freq);
} else {
params->freq = 2412;
wpa_printf(MSG_DEBUG, "P2P: Set GO freq %d MHz (no preference "
"known)", params->freq);
}
if (wpa_s->current_ssid && wpa_drv_get_bssid(wpa_s, bssid) == 0 &&
wpa_s->assoc_freq && !freq) {
wpa_printf(MSG_DEBUG, "P2P: Force GO on the channel we are "
@ -2927,6 +2964,46 @@ int wpas_p2p_group_add(struct wpa_supplicant *wpa_s, int persistent_group,
int freq)
{
struct p2p_go_neg_results params;
unsigned int r;
if (freq == 2) {
wpa_printf(MSG_DEBUG, "P2P: Request to start GO on 2.4 GHz "
"band");
if (wpa_s->best_24_freq > 0 &&
p2p_supported_freq(wpa_s->global->p2p,
wpa_s->best_24_freq)) {
freq = wpa_s->best_24_freq;
wpa_printf(MSG_DEBUG, "P2P: Use best 2.4 GHz band "
"channel: %d MHz", freq);
} else {
os_get_random((u8 *) &r, sizeof(r));
freq = 2412 + (r % 3) * 25;
wpa_printf(MSG_DEBUG, "P2P: Use random 2.4 GHz band "
"channel: %d MHz", freq);
}
}
if (freq == 5) {
wpa_printf(MSG_DEBUG, "P2P: Request to start GO on 5 GHz "
"band");
if (wpa_s->best_5_freq > 0 &&
p2p_supported_freq(wpa_s->global->p2p,
wpa_s->best_5_freq)) {
freq = wpa_s->best_5_freq;
wpa_printf(MSG_DEBUG, "P2P: Use best 5 GHz band "
"channel: %d MHz", freq);
} else {
os_get_random((u8 *) &r, sizeof(r));
freq = 5180 + (r % 4) * 20;
if (!p2p_supported_freq(wpa_s->global->p2p, freq)) {
wpa_printf(MSG_DEBUG, "P2P: Could not select "
"5 GHz channel for P2P group");
return -1;
}
wpa_printf(MSG_DEBUG, "P2P: Use random 5 GHz band "
"channel: %d MHz", freq);
}
}
if (freq > 0 && !p2p_supported_freq(wpa_s->global->p2p, freq)) {
wpa_printf(MSG_DEBUG, "P2P: The forced channel for GO "
@ -3790,3 +3867,13 @@ void wpas_p2p_interface_unavailable(struct wpa_supplicant *wpa_s)
wpa_s->removal_reason = P2P_GROUP_REMOVAL_UNAVAILABLE;
wpas_p2p_group_delete(wpa_s);
}
void wpas_p2p_update_best_channels(struct wpa_supplicant *wpa_s,
int freq_24, int freq_5, int freq_overall)
{
struct p2p_data *p2p = wpa_s->global->p2p;
if (p2p == NULL || (wpa_s->drv_flags & WPA_DRIVER_FLAGS_P2P_MGMT))
return;
p2p_set_best_channels(p2p, freq_24, freq_5, freq_overall);
}

2
wpa_supplicant/p2p_supplicant.h
View file

@ -118,5 +118,7 @@ int wpas_p2p_notif_pbc_overlap(struct wpa_supplicant *wpa_s);
void wpas_p2p_update_channel_list(struct wpa_supplicant *wpa_s);
int wpas_p2p_cancel(struct wpa_supplicant *wpa_s);
void wpas_p2p_interface_unavailable(struct wpa_supplicant *wpa_s);
void wpas_p2p_update_best_channels(struct wpa_supplicant *wpa_s,
int freq_24, int freq_5, int freq_overall);
#endif /* P2P_SUPPLICANT_H */

5
wpa_supplicant/wpa_supplicant_i.h
View file

@ -534,6 +534,11 @@ struct wpa_supplicant {
unsigned int wps_freq;
int wps_fragment_size;
int auto_reconnect_disabled;
/* Channel preferences for AP/P2P GO use */
int best_24_freq;
int best_5_freq;
int best_overall_freq;
};