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station: react to (new) netdev packet loss event

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This adds a new netdev event for packet loss notifications from
the kernel. Depending on the scenario a station may see packet
loss events without any other indications like low RSSI. In these
cases IWD should still roam since there is no data flowing.
This commit is contained in:
James Prestwood 2022-08-09 16:04:25 -07:00 committed by Denis Kenzior
parent 69e9945ef7
commit 103eeb2cc6
2 changed files with 34 additions and 6 deletions
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1
src/netdev.h
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@ -49,6 +49,7 @@ enum netdev_event {
NETDEV_EVENT_RSSI_THRESHOLD_LOW,
NETDEV_EVENT_RSSI_THRESHOLD_HIGH,
NETDEV_EVENT_RSSI_LEVEL_NOTIFY,
NETDEV_EVENT_PACKET_LOSS_NOTIFY,
};
enum netdev_watch_event {

39
src/station.c
View File

@ -2535,15 +2535,10 @@ static void station_neighbor_report_cb(struct netdev *netdev, int err,
station_roam_failed(station);
}
static void station_roam_trigger_cb(struct l_timeout *timeout, void *user_data)
static void station_start_roam(struct station *station)
{
struct station *station = user_data;
int r;
l_debug("%u", netdev_get_ifindex(station->netdev));
l_timeout_remove(station->roam_trigger_timeout);
station->roam_trigger_timeout = NULL;
station->preparing_roam = true;
/*
@ -2577,6 +2572,18 @@ static void station_roam_trigger_cb(struct l_timeout *timeout, void *user_data)
station_roam_failed(station);
}
static void station_roam_trigger_cb(struct l_timeout *timeout, void *user_data)
{
struct station *station = user_data;
l_debug("%u", netdev_get_ifindex(station->netdev));
l_timeout_remove(station->roam_trigger_timeout);
station->roam_trigger_timeout = NULL;
station_start_roam(station);
}
static void station_roam_timeout_rearm(struct station *station, int seconds)
{
struct timespec now, min_timeout;
@ -3057,6 +3064,23 @@ static void station_disconnect_event(struct station *station, void *event_data)
l_warn("Unexpected disconnect event");
}
#define STATION_PKT_LOSS_THRESHOLD 10
static void station_packets_lost(struct station *station, uint32_t num_pkts)
{
l_debug("Packets lost event: %u", num_pkts);
if (num_pkts < STATION_PKT_LOSS_THRESHOLD)
return;
if (station_cannot_roam(station))
return;
station_debug_event(station, "packet-loss-roam");
station_start_roam(station);
}
static void station_netdev_event(struct netdev *netdev, enum netdev_event event,
void *event_data, void *user_data)
{
@ -3092,6 +3116,9 @@ static void station_netdev_event(struct netdev *netdev, enum netdev_event event,
case NETDEV_EVENT_CHANNEL_SWITCHED:
station_event_channel_switched(station, l_get_u32(event_data));
break;
case NETDEV_EVENT_PACKET_LOSS_NOTIFY:
station_packets_lost(station, l_get_u32(event_data));
break;
}
}