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netdev: fall back to RSSI polling if SET_CQM fails

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Some drivers fail to set a CQM threshold and report not supported.
Its unclear exactly why but if this happens roaming is effectively
broken.

To work around this enable RSSI polling if -ENOTSUP is returned.
The polling callback has been changed to emit the HIGH/LOW signal
threshold events instead of just the RSSI level index, just as if
a CQM event came from the kernel.
This commit is contained in:
James Prestwood 2024-09-03 11:06:52 -07:00 committed by Denis Kenzior
parent 23cf6107c6
commit 154a29be05
1 changed files with 108 additions and 50 deletions
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158
src/netdev.c
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@ -133,6 +133,7 @@ struct netdev {
uint32_t get_oci_cmd_id;
uint32_t get_link_cmd_id;
uint32_t power_save_cmd_id;
uint32_t set_cqm_cmd_id;
enum netdev_result result;
uint16_t last_code; /* reason or status, depending on result */
struct l_timeout *neighbor_report_timeout;
@ -190,6 +191,7 @@ struct netdev {
bool retry_auth : 1;
bool in_reassoc : 1;
bool privacy : 1;
bool cqm_poll_fallback : 1;
};
struct netdev_preauth_state {
@ -650,6 +652,47 @@ static void netdev_set_rssi_level_idx(struct netdev *netdev)
netdev->cur_rssi_level_idx = new_level;
}
static void netdev_cqm_event_rssi_value(struct netdev *netdev, int rssi_val)
{
bool new_rssi_low;
uint8_t prev_rssi_level_idx = netdev->cur_rssi_level_idx;
int threshold = netdev->frequency > 4000 ?
netdev->low_signal_threshold_5ghz :
netdev->low_signal_threshold;
if (!netdev->connected)
return;
if (rssi_val > 127)
rssi_val = 127;
else if (rssi_val < -127)
rssi_val = -127;
netdev->cur_rssi = rssi_val;
if (!netdev->event_filter)
return;
new_rssi_low = rssi_val < threshold;
if (netdev->cur_rssi_low != new_rssi_low) {
int event = new_rssi_low ?
NETDEV_EVENT_RSSI_THRESHOLD_LOW :
NETDEV_EVENT_RSSI_THRESHOLD_HIGH;
netdev->cur_rssi_low = new_rssi_low;
netdev->event_filter(netdev, event, NULL, netdev->user_data);
}
if (!netdev->rssi_levels_num)
return;
netdev_set_rssi_level_idx(netdev);
if (netdev->cur_rssi_level_idx != prev_rssi_level_idx)
netdev->event_filter(netdev, NETDEV_EVENT_RSSI_LEVEL_NOTIFY,
&netdev->cur_rssi_level_idx,
netdev->user_data);
}
static void netdev_rssi_poll_cb(struct l_genl_msg *msg, void *user_data)
{
struct netdev *netdev = user_data;
@ -686,11 +729,16 @@ static void netdev_rssi_poll_cb(struct l_genl_msg *msg, void *user_data)
netdev->cur_rssi = info.cur_rssi;
/*
* Note we don't have to handle LOW_SIGNAL_THRESHOLD here. The
* CQM single threshold RSSI monitoring should work even if the
* kernel driver doesn't support multiple thresholds. So the
* polling only handles the client-supplied threshold list.
* If the CMD_SET_CQM call failed RSSI polling was started. In this case
* we should behave just like its a CQM event and check both the RSSI
* level indexes and the HIGH/LOW thresholds.
*/
if (netdev->cqm_poll_fallback) {
netdev_cqm_event_rssi_value(netdev, info.cur_rssi);
goto done;
}
/* Otherwise just update the level notifications, CQM events work */
netdev_set_rssi_level_idx(netdev);
if (netdev->cur_rssi_level_idx != prev_rssi_level_idx)
netdev->event_filter(netdev, NETDEV_EVENT_RSSI_LEVEL_NOTIFY,
@ -1031,6 +1079,11 @@ static void netdev_free(void *data)
netdev->get_station_cmd_id = 0;
}
if (netdev->set_cqm_cmd_id) {
l_genl_family_cancel(nl80211, netdev->set_cqm_cmd_id);
netdev->set_cqm_cmd_id = 0;
}
if (netdev->fw_roam_bss)
scan_bss_free(netdev->fw_roam_bss);
@ -1039,6 +1092,9 @@ static void netdev_free(void *data)
netdev->get_link_cmd_id = 0;
}
if (netdev->rssi_poll_timeout)
l_timeout_remove(netdev->rssi_poll_timeout);
scan_wdev_remove(netdev->wdev_id);
watchlist_destroy(&netdev->station_watches);
@ -1093,47 +1149,6 @@ static void netdev_cqm_event_rssi_threshold(struct netdev *netdev,
netdev->event_filter(netdev, event, NULL, netdev->user_data);
}
static void netdev_cqm_event_rssi_value(struct netdev *netdev, int rssi_val)
{
bool new_rssi_low;
uint8_t prev_rssi_level_idx = netdev->cur_rssi_level_idx;
int threshold = netdev->frequency > 4000 ?
netdev->low_signal_threshold_5ghz :
netdev->low_signal_threshold;
if (!netdev->connected)
return;
if (rssi_val > 127)
rssi_val = 127;
else if (rssi_val < -127)
rssi_val = -127;
netdev->cur_rssi = rssi_val;
if (!netdev->event_filter)
return;
new_rssi_low = rssi_val < threshold;
if (netdev->cur_rssi_low != new_rssi_low) {
int event = new_rssi_low ?
NETDEV_EVENT_RSSI_THRESHOLD_LOW :
NETDEV_EVENT_RSSI_THRESHOLD_HIGH;
netdev->cur_rssi_low = new_rssi_low;
netdev->event_filter(netdev, event, NULL, netdev->user_data);
}
if (!netdev->rssi_levels_num)
return;
netdev_set_rssi_level_idx(netdev);
if (netdev->cur_rssi_level_idx != prev_rssi_level_idx)
netdev->event_filter(netdev, NETDEV_EVENT_RSSI_LEVEL_NOTIFY,
&netdev->cur_rssi_level_idx,
netdev->user_data);
}
static void netdev_cqm_event(struct l_genl_msg *msg, struct netdev *netdev)
{
struct l_genl_attr attr;
@ -3644,11 +3659,50 @@ static struct l_genl_msg *netdev_build_cmd_cqm_rssi_update(
static void netdev_cmd_set_cqm_cb(struct l_genl_msg *msg, void *user_data)
{
struct netdev *netdev = user_data;
int err = l_genl_msg_get_error(msg);
const char *ext_error;
if (err >= 0)
netdev->set_cqm_cmd_id = 0;
if (err >= 0) {
/*
* Looking at some driver code it appears that the -ENOTSUP CQM
* failure could be transient. Just in case, reset the fallback
* flag if CQM happens to start working again.
*/
if (netdev->cqm_poll_fallback) {
l_debug("CMD_SET_CQM succeeded, stop polling fallback");
if (netdev->rssi_poll_timeout) {
l_timeout_remove(netdev->rssi_poll_timeout);
netdev->rssi_poll_timeout = NULL;
}
netdev->cqm_poll_fallback = false;
}
return;
}
/*
* Some drivers enable beacon filtering but also use software CQM which
* mac80211 detects and returns -ENOTSUP. There is no way to check this
* ahead of time so if we see this start polling in order to get RSSI
* updates.
*/
if (err == -ENOTSUP) {
l_debug("CMD_SET_CQM not supported, falling back to polling");
netdev->cqm_poll_fallback = true;
if (netdev->rssi_poll_timeout)
return;
netdev->rssi_poll_timeout = l_timeout_create(1,
netdev_rssi_poll, netdev, NULL);
return;
}
ext_error = l_genl_msg_get_extended_error(msg);
l_error("CMD_SET_CQM failed: %s",
@ -3671,8 +3725,10 @@ static int netdev_cqm_rssi_update(struct netdev *netdev)
if (!msg)
return -EINVAL;
if (!l_genl_family_send(nl80211, msg, netdev_cmd_set_cqm_cb,
NULL, NULL)) {
netdev->set_cqm_cmd_id = l_genl_family_send(nl80211, msg,
netdev_cmd_set_cqm_cb,
netdev, NULL);
if (!netdev->set_cqm_cmd_id) {
l_genl_msg_unref(msg);
return -EIO;
}
@ -5309,8 +5365,10 @@ int netdev_set_rssi_report_levels(struct netdev *netdev, const int8_t *levels,
if (!cmd_set_cqm)
return -EINVAL;
if (!l_genl_family_send(nl80211, cmd_set_cqm, netdev_cmd_set_cqm_cb,
NULL, NULL)) {
netdev->set_cqm_cmd_id = l_genl_family_send(nl80211, cmd_set_cqm,
netdev_cmd_set_cqm_cb,
netdev, NULL);
if (!netdev->set_cqm_cmd_id) {
l_genl_msg_unref(cmd_set_cqm);
return -EIO;
}