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Subject[PATCH v3] brcmfmac: add support for CQM RSSI notifications
Date
Add support for CQM RSSI measurement reporting and advertise the
NL80211_EXT_FEATURE_CQM_RSSI_LIST feature. This enables a userspace
supplicant such as iwd to be notified of changes in the RSSI for roaming
and signal monitoring purposes.

Signed-off-by: Alvin Šipraga <alsi@bang-olufsen.dk>
Reviewed-by: Arend van Spriel <arend.vanspriel@broadcom.com>
---
v2 -> v3:
- add Reviewed-by tag from Arend
- no other changes

v1 -> v2:
- clarify firmware behaviour in a comment
- fix detection of upper bound RSSI transition
- improve clamping of min/max RSSI values
- remove unnecessary check on last RSSI value
---
.../broadcom/brcm80211/brcmfmac/cfg80211.c | 87 +++++++++++++++++++
.../broadcom/brcm80211/brcmfmac/cfg80211.h | 6 ++
.../broadcom/brcm80211/brcmfmac/fwil_types.h | 28 ++++++
3 files changed, 121 insertions(+)

diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
index 0ee421f30aa2..605aa3f4ddc7 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
@@ -5196,6 +5196,48 @@ brcmf_cfg80211_mgmt_tx(struct wiphy *wiphy, struct wireless_dev *wdev,
return err;
}

+static int brcmf_cfg80211_set_cqm_rssi_range_config(struct wiphy *wiphy,
+ struct net_device *ndev,
+ s32 rssi_low, s32 rssi_high)
+{
+ struct brcmf_cfg80211_vif *vif;
+ struct brcmf_if *ifp;
+ int err = 0;
+
+ brcmf_dbg(TRACE, "low=%d high=%d", rssi_low, rssi_high);
+
+ ifp = netdev_priv(ndev);
+ vif = ifp->vif;
+
+ if (rssi_low != vif->cqm_rssi_low || rssi_high != vif->cqm_rssi_high) {
+ /* The firmware will send an event when the RSSI is less than or
+ * equal to a configured level and the previous RSSI event was
+ * less than or equal to a different level. Set a third level
+ * so that we also detect the transition from rssi <= rssi_high
+ * to rssi > rssi_high.
+ */
+ struct brcmf_rssi_event_le config = {
+ .rate_limit_msec = cpu_to_le32(0),
+ .rssi_level_num = 3,
+ .rssi_levels = {
+ clamp_val(rssi_low, S8_MIN, S8_MAX - 2),
+ clamp_val(rssi_high, S8_MIN + 1, S8_MAX - 1),
+ S8_MAX,
+ },
+ };
+
+ err = brcmf_fil_iovar_data_set(ifp, "rssi_event", &config,
+ sizeof(config));
+ if (err) {
+ err = -EINVAL;
+ } else {
+ vif->cqm_rssi_low = rssi_low;
+ vif->cqm_rssi_high = rssi_high;
+ }
+ }
+
+ return err;
+}

static int
brcmf_cfg80211_cancel_remain_on_channel(struct wiphy *wiphy,
@@ -5502,6 +5544,7 @@ static struct cfg80211_ops brcmf_cfg80211_ops = {
.update_mgmt_frame_registrations =
brcmf_cfg80211_update_mgmt_frame_registrations,
.mgmt_tx = brcmf_cfg80211_mgmt_tx,
+ .set_cqm_rssi_range_config = brcmf_cfg80211_set_cqm_rssi_range_config,
.remain_on_channel = brcmf_p2p_remain_on_channel,
.cancel_remain_on_channel = brcmf_cfg80211_cancel_remain_on_channel,
.get_channel = brcmf_cfg80211_get_channel,
@@ -6137,6 +6180,47 @@ brcmf_notify_mic_status(struct brcmf_if *ifp,
return 0;
}

+static s32 brcmf_notify_rssi(struct brcmf_if *ifp,
+ const struct brcmf_event_msg *e, void *data)
+{
+ struct brcmf_cfg80211_vif *vif = ifp->vif;
+ struct brcmf_rssi_be *info = data;
+ s32 rssi, snr, noise;
+ s32 low, high, last;
+
+ if (e->datalen < sizeof(*info)) {
+ brcmf_err("insufficient RSSI event data\n");
+ return 0;
+ }
+
+ rssi = be32_to_cpu(info->rssi);
+ snr = be32_to_cpu(info->snr);
+ noise = be32_to_cpu(info->noise);
+
+ low = vif->cqm_rssi_low;
+ high = vif->cqm_rssi_high;
+ last = vif->cqm_rssi_last;
+
+ brcmf_dbg(TRACE, "rssi=%d snr=%d noise=%d low=%d high=%d last=%d\n",
+ rssi, snr, noise, low, high, last);
+
+ vif->cqm_rssi_last = rssi;
+
+ if (rssi <= low || rssi == 0) {
+ brcmf_dbg(INFO, "LOW rssi=%d\n", rssi);
+ cfg80211_cqm_rssi_notify(ifp->ndev,
+ NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
+ rssi, GFP_KERNEL);
+ } else if (rssi > high) {
+ brcmf_dbg(INFO, "HIGH rssi=%d\n", rssi);
+ cfg80211_cqm_rssi_notify(ifp->ndev,
+ NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
+ rssi, GFP_KERNEL);
+ }
+
+ return 0;
+}
+
static s32 brcmf_notify_vif_event(struct brcmf_if *ifp,
const struct brcmf_event_msg *e, void *data)
{
@@ -6235,6 +6319,7 @@ static void brcmf_register_event_handlers(struct brcmf_cfg80211_info *cfg)
brcmf_p2p_notify_action_tx_complete);
brcmf_fweh_register(cfg->pub, BRCMF_E_PSK_SUP,
brcmf_notify_connect_status);
+ brcmf_fweh_register(cfg->pub, BRCMF_E_RSSI, brcmf_notify_rssi);
}

static void brcmf_deinit_priv_mem(struct brcmf_cfg80211_info *cfg)
@@ -7169,6 +7254,8 @@ static int brcmf_setup_wiphy(struct wiphy *wiphy, struct brcmf_if *ifp)
wiphy_ext_feature_set(wiphy,
NL80211_EXT_FEATURE_DFS_OFFLOAD);

+ wiphy_ext_feature_set(wiphy, NL80211_EXT_FEATURE_CQM_RSSI_LIST);
+
wiphy_read_of_freq_limits(wiphy);

return 0;
diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.h b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.h
index 17817cdb5de2..e90a30808c22 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.h
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.h
@@ -213,6 +213,9 @@ struct vif_saved_ie {
* @list: linked list.
* @mgmt_rx_reg: registered rx mgmt frame types.
* @mbss: Multiple BSS type, set if not first AP (not relevant for P2P).
+ * @cqm_rssi_low: Lower RSSI limit for CQM monitoring
+ * @cqm_rssi_high: Upper RSSI limit for CQM monitoring
+ * @cqm_rssi_last: Last RSSI reading for CQM monitoring
*/
struct brcmf_cfg80211_vif {
struct brcmf_if *ifp;
@@ -224,6 +227,9 @@ struct brcmf_cfg80211_vif {
u16 mgmt_rx_reg;
bool mbss;
int is_11d;
+ s32 cqm_rssi_low;
+ s32 cqm_rssi_high;
+ s32 cqm_rssi_last;
};

/* association inform */
diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/fwil_types.h b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/fwil_types.h
index 2e31cc10c195..ff2ef557f0ea 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/fwil_types.h
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/fwil_types.h
@@ -752,6 +752,34 @@ struct brcmf_assoclist_le {
u8 mac[BRCMF_MAX_ASSOCLIST][ETH_ALEN];
};

+/**
+ * struct brcmf_rssi_be - RSSI threshold event format
+ *
+ * @rssi: receive signal strength (in dBm)
+ * @snr: signal-noise ratio
+ * @noise: noise (in dBm)
+ */
+struct brcmf_rssi_be {
+ __be32 rssi;
+ __be32 snr;
+ __be32 noise;
+};
+
+#define BRCMF_MAX_RSSI_LEVELS 8
+
+/**
+ * struct brcm_rssi_event_le - rssi_event IOVAR format
+ *
+ * @rate_limit_msec: RSSI event rate limit
+ * @rssi_level_num: number of supplied RSSI levels
+ * @rssi_levels: RSSI levels in ascending order
+ */
+struct brcmf_rssi_event_le {
+ __le32 rate_limit_msec;
+ s8 rssi_level_num;
+ s8 rssi_levels[BRCMF_MAX_RSSI_LEVELS];
+};
+
/**
* struct brcmf_wowl_wakeind_le - Wakeup indicators
* Note: note both fields contain same information.
--
2.29.2
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