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iwd
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station: optimize roam scanning 

If neighbor reports are unavailable, or the report yielded no
results we can quickly scan for only known frequencies. This
changes the original behavior where we would do a full scan
in this case.
This commit is contained in:
James Prestwood 2019-09-17 09:49:53 -07:00 committed by Denis Kenzior
parent 235fd2b7e6
commit a8187468b5
1 changed files with 28 additions and 4 deletions
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32
src/station.c
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@ -1696,6 +1696,25 @@ static void station_roam_scan(struct station *station,
station_roam_failed(station);
}
static bool station_roam_scan_known_freqs(struct station *station)
{
const struct network_info *info = network_get_info(
station->connected_network);
struct scan_freq_set *freqs = network_info_get_roam_frequencies(info,
station->connected_bss->frequency, 5);
if (!freqs) {
l_debug("no known frequencies to scan");
return false;
}
station_roam_scan(station, freqs);
scan_freq_set_free(freqs);
return true;
}
static uint32_t station_freq_from_neighbor_report(const uint8_t *country,
struct ie_neighbor_report_info *info, enum scan_band *out_band)
{
@ -1765,8 +1784,10 @@ static void station_neighbor_report_cb(struct netdev *netdev, int err,
return;
if (!reports || err) {
/* Have to do a full scan */
station_roam_scan(station, NULL);
if (!station_roam_scan_known_freqs(station)) {
l_debug("no neighbor report results or known freqs");
station_roam_failed(station);
}
return;
}
@ -1895,8 +1916,11 @@ static void station_roam_trigger_cb(struct l_timeout *timeout, void *user_data)
station_neighbor_report_cb))
return;
/* Otherwise do a full scan for target BSS candidates */
station_roam_scan(station, NULL);
if (!station_roam_scan_known_freqs(station)) {
l_debug("No neighbor report or known frequencies, roam failed");
station_roam_failed(station);
return;
}
}
static void station_roam_timeout_rearm(struct station *station, int seconds)