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Sources/usteer/band_steering.c

  1 /*
  2  *   This program is free software; you can redistribute it and/or modify
  3  *   it under the terms of the GNU General Public License as published by
  4  *   the Free Software Foundation; either version 2 of the License.
  5  *
  6  *   This program is distributed in the hope that it will be useful,
  7  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  8  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  9  *   GNU General Public License for more details.
 10  *
 11  *   You should have received a copy of the GNU General Public License
 12  *   along with this program; if not, write to the Free Software
 13  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
 14  *
 15  *   Copyright (C) 2022 David Bauer <mail@david-bauer.net>
 16  */
 17 
 18 #include "usteer.h"
 19 #include "node.h"
 20 
 21 void usteer_band_steering_sta_update(struct sta_info *si)
 22 {
 23         if (si->signal < usteer_snr_to_signal(si->node, config.band_steering_min_snr))
 24                 si->band_steering.below_snr = true;
 25 }
 26 
 27 bool usteer_band_steering_is_target(struct usteer_local_node *ln, struct usteer_node *node)
 28 {
 29         if (&ln->node == node)
 30                 return false;
 31 
 32         if (strcmp(ln->node.ssid, node->ssid))
 33                 return false;
 34 
 35         if (node->freq < 4000)
 36                 return false;
 37 
 38         if (!usteer_policy_node_below_max_assoc(node))
 39                 return false;
 40         
 41         /* ToDo: Skip nodes with active load-kick */
 42         
 43         return true;
 44  }
 45 
 46 
 47 static bool usteer_band_steering_has_target_iface(struct usteer_local_node *ln)
 48 {
 49         struct usteer_node *node;
 50 
 51         for_each_local_node(node) {
 52                 if (usteer_band_steering_is_target(ln, node))
 53                         return true;
 54         }
 55 
 56         return false;
 57 }
 58 
 59 void usteer_band_steering_perform_steer(struct usteer_local_node *ln)
 60 {
 61         unsigned int min_count = DIV_ROUND_UP(config.band_steering_interval, config.local_sta_update);
 62         struct sta_info *si;
 63 
 64         if (!config.band_steering_interval)
 65                 return;
 66 
 67         /* Band-Steering is only available on 2.4 GHz interfaces */
 68         if (ln->node.freq > 4000)
 69                 return;
 70 
 71         /* Check if we have an interface we can steer to */
 72         if (!usteer_band_steering_has_target_iface(ln))
 73                 return;
 74 
 75         /* Only steer every interval */
 76         if (ln->band_steering_interval < min_count) {
 77                 ln->band_steering_interval++;
 78                 return;
 79         }
 80 
 81         ln->band_steering_interval = 0;
 82 
 83         list_for_each_entry(si, &ln->node.sta_info, node_list) {
 84                 if (si->connected != STA_CONNECTED)
 85                         continue;
 86 
 87                 /* Skip clients with insufficient SNR-state */
 88                 if (si->band_steering.below_snr) {
 89                         si->band_steering.below_snr = false;
 90                         continue;
 91                 }
 92 
 93                 if (si->bss_transition)
 94                         usteer_ubus_band_steering_request(si);
 95 
 96                 si->band_steering.below_snr = false;
 97         }
 98 }

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