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station: optimize roam scanning

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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)