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station: Add quick scan

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Quick scan uses a set of frequencies associated with the
known networks. This allows to reduce the scan latency.
At this time, the frequency selection follows a very simple
logic by taking all known frequencies from the top 5 most
recently connected networks.
If connection isn't established after the quick scan attempt,
we fall back to the full periodic scan.
This commit is contained in:
Tim Kourt 2019-04-16 14:51:42 -07:00 committed by Denis Kenzior
parent 5c9138ed7d
commit 1c04707487
1 changed files with 89 additions and 1 deletions
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90
src/station.c
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@ -2,7 +2,7 @@
*
* Wireless daemon for Linux
*
* Copyright (C) 2018 Intel Corporation. All rights reserved.
* Copyright (C) 2018-2019 Intel Corporation. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
@ -68,6 +68,7 @@ struct station {
struct l_dbus_message *scan_pending;
struct signal_agent *signal_agent;
uint32_t dbus_scan_id;
uint32_t quick_scan_id;
uint32_t hidden_network_scan_id;
/* Roaming related members */
@ -724,6 +725,87 @@ static uint32_t station_scan_trigger(struct station *station,
return scan_passive(index, freqs, triggered, notify, station, destroy);
}
static bool station_quick_scan_results(int err, struct l_queue *bss_list,
void *userdata)
{
struct station *station = userdata;
bool autoconnect;
station_property_set_scanning(station, false);
if (err) {
station_enter_state(station, STATION_STATE_AUTOCONNECT_FULL);
return false;
}
autoconnect = station_is_autoconnecting(station);
station_set_scan_results(station, bss_list, autoconnect);
if (autoconnect)
station_autoconnect_next(station);
if (station->state == STATION_STATE_AUTOCONNECT_QUICK)
/*
* If we're still in AUTOCONNECT_QUICK state, then autoconnect
* failed to find any candidates. Transition to AUTOCONNECT_FULL
*/
station_enter_state(station, STATION_STATE_AUTOCONNECT_FULL);
return true;
}
static void station_quick_scan_triggered(int err, void *user_data)
{
struct station *station = user_data;
if (err < 0) {
l_debug("Quick scan trigger failed: %i", err);
station_enter_state(station, STATION_STATE_AUTOCONNECT_FULL);
return;
}
l_debug("Quick scan triggered for %s",
netdev_get_name(station->netdev));
station_property_set_scanning(station, true);
}
static void station_quick_scan_destroy(void *userdata)
{
struct station *station = userdata;
station->quick_scan_id = 0;
}
static void station_quick_scan_trigger(struct station *station)
{
struct scan_freq_set *known_freq_set;
known_freq_set = known_networks_get_recent_frequencies(5);
if (!known_freq_set)
goto autoconnect_full;
if (!wiphy_constrain_freq_set(station->wiphy, known_freq_set))
goto skip_scan;
station->quick_scan_id = station_scan_trigger(station,
known_freq_set,
station_quick_scan_triggered,
station_quick_scan_results,
station_quick_scan_destroy);
skip_scan:
scan_freq_set_free(known_freq_set);
if (station->quick_scan_id)
return;
autoconnect_full:
station_enter_state(station, STATION_STATE_AUTOCONNECT_FULL);
}
static const char *station_state_to_string(enum station_state state)
{
switch (state) {
@ -766,6 +848,8 @@ static void station_enter_state(struct station *station,
switch (state) {
case STATION_STATE_AUTOCONNECT_QUICK:
station_quick_scan_trigger(station);
break;
case STATION_STATE_AUTOCONNECT_FULL:
scan_periodic_start(index, periodic_scan_trigger,
new_scan_results, station);
@ -2555,6 +2639,10 @@ static void station_free(struct station *station)
scan_cancel(netdev_get_ifindex(station->netdev),
station->dbus_scan_id);
if (station->quick_scan_id)
scan_cancel(netdev_get_ifindex(station->netdev),
station->quick_scan_id);
if (station->hidden_network_scan_id)
scan_cancel(netdev_get_ifindex(station->netdev),
station->hidden_network_scan_id);