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Apply a symmetrical bias against moving away from higher bands

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There is currently a bias towards moving to higher bands but not one
against moving away from them. Fix that.

Signed-off-by: Matthew Wang <matthewmwang@chromium.org>
This commit is contained in:
Matthew Wang 2023-12-28 21:03:43 +00:00 committed by Jouni Malinen
parent 05474b34bf
commit 5290523db3
1 changed files with 14 additions and 4 deletions
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18
wpa_supplicant/events.c
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@ -2127,11 +2127,22 @@ wpas_get_est_throughput_from_bss_snr(const struct wpa_supplicant *wpa_s,
}
static int wpas_evaluate_band_score(int frequency)
{
if (is_6ghz_freq(frequency))
return 2;
if (IS_5GHZ(frequency))
return 1;
return 0;
}
int wpa_supplicant_need_to_roam_within_ess(struct wpa_supplicant *wpa_s,
struct wpa_bss *current_bss,
struct wpa_bss *selected)
{
int min_diff, diff;
int cur_band_score, sel_band_score;
int to_5ghz, to_6ghz;
int cur_level, sel_level;
unsigned int cur_est, sel_est;
@ -2277,10 +2288,9 @@ int wpa_supplicant_need_to_roam_within_ess(struct wpa_supplicant *wpa_s,
else if (sel_est > cur_est)
min_diff--;
if (to_5ghz)
min_diff -= 2;
if (to_6ghz)
min_diff -= 2;
cur_band_score = wpas_evaluate_band_score(current_bss->freq);
sel_band_score = wpas_evaluate_band_score(selected->freq);
min_diff += (cur_band_score - sel_band_score) * 2;
if (wpa_s->signal_threshold && cur_level <= wpa_s->signal_threshold &&
sel_level > wpa_s->signal_threshold)
min_diff -= 2;