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datastorage: use signal strength as a metric

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This adds a few options to use the signal strength as a metric, band
dependent:

 - rssi_weight: every db of signal increases the score by this much.
 - rssi_center: if the signal is stronger than this, the score becomes
                positive; below this, it is negative.
 - initial_score:  since we are capping negative scores, it may be
   beneficial to have a positive base score to offset a possible
   negative signal value.  This is replacing the 'freq' metric.

To avoid a single-digit RSSI increase resulting in a kick, we add a
global threshold value to act as a buffer:

 - kicking_threshold: a candidate AP must have a score larger than that
                      of the current AP plus the value here.

The kicking_threshold also applies when assembling the list of roaming
neighbors we send with the "wnm_disassoc_imminent" command.

Signed-off-by: Eneas U de Queiroz <cotequeiroz@gmail.com>
This commit is contained in:
Eneas U de Queiroz 2021-08-04 09:11:06 -03:00 • committed by Polynomdivision
parent 14e0f8386c
commit c70773a171
6 changed files with 89 additions and 32 deletions
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5
src/utils/ubus.c
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@ -1448,6 +1448,7 @@ int uci_send_via_network()
blobmsg_add_u32(&b, "eval_auth_req", dawn_metric.eval_auth_req);
blobmsg_add_u32(&b, "eval_assoc_req", dawn_metric.eval_assoc_req);
blobmsg_add_u32(&b, "kicking", dawn_metric.kicking);
blobmsg_add_u32(&b, "kicking_threshold", dawn_metric.kicking_threshold);
blobmsg_add_u32(&b, "deny_auth_reason", dawn_metric.deny_auth_reason);
blobmsg_add_u32(&b, "deny_assoc_reason", dawn_metric.deny_assoc_reason);
blobmsg_add_u32(&b, "use_driver_recog", dawn_metric.use_driver_recog);
@ -1460,6 +1461,7 @@ int uci_send_via_network()
for (int band=0; band < __DAWN_BAND_MAX; band++) {
band_entry = blobmsg_open_table(&b, band_config_name[band]);
blobmsg_add_u32(&b, "initial_score", dawn_metric.initial_score[band]);
blobmsg_add_u32(&b, "ap_weight", dawn_metric.ap_weight[band]);
blobmsg_add_u32(&b, "ht_support", dawn_metric.ht_support[band]);
blobmsg_add_u32(&b, "vht_support", dawn_metric.vht_support[band]);
@ -1469,11 +1471,12 @@ int uci_send_via_network()
blobmsg_add_u32(&b, "rssi_val", dawn_metric.rssi_val[band]);
blobmsg_add_u32(&b, "low_rssi", dawn_metric.low_rssi[band]);
blobmsg_add_u32(&b, "low_rssi_val", dawn_metric.low_rssi_val[band]);
blobmsg_add_u32(&b, "freq", dawn_metric.freq[band]);
blobmsg_add_u32(&b, "chan_util", dawn_metric.chan_util[band]);
blobmsg_add_u32(&b, "max_chan_util", dawn_metric.max_chan_util[band]);
blobmsg_add_u32(&b, "chan_util_val", dawn_metric.chan_util_val[band]);
blobmsg_add_u32(&b, "max_chan_util_val", dawn_metric.max_chan_util_val[band]);
blobmsg_add_u32(&b, "rssi_weight", dawn_metric.rssi_weight[band]);
blobmsg_add_u32(&b, "rssi_center", dawn_metric.rssi_center[band]);
blobmsg_close_table(&b, band_entry);
}
blobmsg_close_table(&b, band_table);