const unsigned MAX_BUCKETS = 16;
const unsigned MAX_HOTLIST_APS = 128;
const unsigned MAX_SIGNIFICANT_CHANGE_APS = 64;
-const unsigned MAX_PNO_SSID = 128;
+const unsigned MAX_PNO_SSID = 64;
+const unsigned MAX_HOTLIST_SSID = 8;
+const unsigned MAX_BLACKLIST_BSSID = 16;
+const unsigned MAX_AP_CACHE_PER_SCAN = 32;
wifi_error wifi_get_valid_channels(wifi_interface_handle handle,
int band, int max_channels, wifi_channel *channels, int *num_channels);
int max_rssi_sample_size; // number of RSSI samples used for averaging RSSI
int max_scan_reporting_threshold; // max possible report_threshold as described
// in wifi_scan_cmd_params
- int max_hotlist_aps; // maximum number of entries for hotlist APs
+ int max_hotlist_bssids; // maximum number of entries for hotlist BSSIDs
+ int max_hotlist_ssids; // maximum number of entries for hotlist SSIDs
int max_significant_wifi_change_aps; // maximum number of entries for
// significant wifi change APs
int max_bssid_history_entries; // number of BSSID/RSSI entries that device can hold
+ int max_number_epno_networks; // max number of epno entries
+ int max_number_epno_networks_by_ssid; // max number of epno entries if ssid is specified,
+ // that is, epno entries for which an exact match is
+ // required, or entries corresponding to hidden ssids
+ int max_number_of_white_listed_ssid; // max number of white listed SSIDs, M target is 2 to 4
} wifi_gscan_capabilities;
wifi_error wifi_get_gscan_capabilities(wifi_interface_handle handle,
/* Add channel class */
} wifi_scan_channel_spec;
+#define REPORT_EVENTS_BUFFER_FULL 0
+#define REPORT_EVENTS_EACH_SCAN 1
+#define REPORT_EVENTS_FULL_RESULTS 2
+#define REPORT_EVENTS_NO_BATCH 4
typedef struct {
int bucket; // bucket index, 0 based
// fast as it can instead of failing the command.
// for exponential backoff bucket this is the min_period
/* report_events semantics -
- * 0 => report only when scan history is % full
- * 1 => same as 0 + report a scan completion event after scanning this bucket
- * 2 => same as 1 + forward scan results (beacons/probe responses + IEs) in real time to HAL
- * 3 => same as 2 + forward scan results (beacons/probe responses + IEs) in real time to
- supplicant as well (optional) .
+ * This is a bit field; which defines following bits -
+ * REPORT_EVENTS_BUFFER_FULL => report only when scan history is % full
+ * REPORT_EVENTS_EACH_SCAN => report a scan completion event after scan
+ * REPORT_EVENTS_FULL_RESULTS => forward scan results (beacons/probe responses + IEs)
+ * in real time to HAL, in addition to completion events
+ * Note: To keep backward compatibility, fire completion
+ * events regardless of REPORT_EVENTS_EACH_SCAN.
+ * REPORT_EVENTS_NO_BATCH => controls batching, 0 => batching, 1 => no batching
*/
byte report_events;
int max_period; // if max_period is non zero or different than period, then this bucket is
// an exponential backoff bucket and the scan period will grow exponentially
- // as per formula: actual_period(N) = period ^ (N/(step_count+1))
+ // as per formula: actual_period(N) = period * (base ^ (N/step_count))
// to a maximum period of max_period
- int exponent; // for exponential back off bucket: multiplier: new_period = old_period * exponent
- int step_count; // for exponential back off bucket, number of scans performed at a given
- // period and until the exponent is applied
+ int base; // for exponential back off bucket: multiplier: new_period=old_period*base
+ int step_count; // for exponential back off bucket, number of scans to perform for a given
+ // period
int num_channels;
// channels to scan; these may include DFS channels
typedef struct {
int base_period; // base timer period in ms
- int max_ap_per_scan; // number of APs to store in each scan ientryn the
- // BSSID/RSSI history buffer (keep the highest RSSI APs)
- int report_threshold_percent; // in %, when scan buffer is this much full, wake up AP
+ int max_ap_per_scan; // number of access points to store in each scan entry in
+ // the BSSID/RSSI history buffer (keep the highest RSSI
+ // access points)
+ int report_threshold_percent; // in %, when scan buffer is this much full, wake up apps
+ // processor
int report_threshold_num_scans; // in number of scans, wake up AP after these many scans
int num_buckets;
wifi_scan_bucket_spec buckets[MAX_BUCKETS];
/* Get the GSCAN cached scan results */
typedef struct {
- int scan_id; // a unique identifier for the scan unit
- int flags; // a bitmask with additional information about scan
- int num_results; // number of bssids retrieved by the scan
- wifi_scan_result *results; // scan results - one for each bssid
+ int scan_id; // a unique identifier for the scan unit
+ int flags; // a bitmask with additional
+ // information about scan
+ int num_results; // number of bssids retrieved by the scan
+ wifi_scan_result results[MAX_AP_CACHE_PER_SCAN]; // scan results - one for each bssid
} wifi_cached_scan_results;
wifi_error wifi_get_cached_gscan_results(wifi_interface_handle iface, byte flush,
typedef struct {
int lost_ap_sample_size;
- int num_ap; // number of hotlist APs
+ int num_bssid; // number of hotlist APs
ap_threshold_param ap[MAX_HOTLIST_APS]; // hotlist APs
} wifi_bssid_hotlist_params;
/* Clear the BSSID Hotlist */
wifi_error wifi_reset_bssid_hotlist(wifi_request_id id, wifi_interface_handle iface);
+/* SSID Hotlist */
+typedef struct {
+ void (*on_hotlist_ssid_found)(wifi_request_id id,
+ unsigned num_results, wifi_scan_result *results);
+ void (*on_hotlist_ssid_lost)(wifi_request_id id,
+ unsigned num_results, wifi_scan_result *results);
+} wifi_hotlist_ssid_handler;
+
+typedef struct {
+ char ssid[32+1]; // SSID
+ wifi_band band; // band for this set of threshold params
+ wifi_rssi low; // low threshold
+ wifi_rssi high; // high threshold
+} ssid_threshold_param;
+
+typedef struct {
+ int lost_ssid_sample_size;
+ int num_ssid; // number of hotlist SSIDs
+ ssid_threshold_param ssid[MAX_HOTLIST_SSID]; // hotlist SSIDs
+} wifi_ssid_hotlist_params;
+
+
+/* Set the SSID Hotlist */
+wifi_error wifi_set_ssid_hotlist(wifi_request_id id, wifi_interface_handle iface,
+ wifi_ssid_hotlist_params params, wifi_hotlist_ssid_handler handler);
+
+/* Clear the SSID Hotlist */
+wifi_error wifi_reset_ssid_hotlist(wifi_request_id id, wifi_interface_handle iface);
+
+
+/* BSSID blacklist */
+typedef struct {
+ int num_bssid; // number of blacklisted BSSIDs
+ mac_addr bssids[MAX_BLACKLIST_BSSID]; // blacklisted BSSIDs
+} wifi_bssid_params;
+
+/* Set the BSSID blacklist */
+wifi_error wifi_set_bssid_blacklist(wifi_request_id id, wifi_interface_handle iface,
+ wifi_bssid_params params);
+
+
/* Significant wifi change */
typedef struct {
mac_addr bssid; // BSSID
int rssi_sample_size; // number of samples for averaging RSSI
int lost_ap_sample_size; // number of samples to confirm AP loss
int min_breaching; // number of APs breaching threshold
- int num_ap; // max 64
+ int num_bssid; // max 64
ap_threshold_param ap[MAX_SIGNIFICANT_CHANGE_APS];
} wifi_significant_change_params;
/* Random MAC OUI for PNO */
wifi_error wifi_set_scanning_mac_oui(wifi_interface_handle handle, oui scan_oui);
-
-#define WIFI_PNO_FLAG_DIRECTED_SCAN = 1 // whether directed scan needs to be performed (for hidden SSIDs)
-#define WIFI_PNO_FLAG_HASH_PROVIDED = 2 // whether a crc32 hash of the ssid is provided instead of the ssid
+// Whether directed scan needs to be performed (for hidden SSIDs)
+#define WIFI_PNO_FLAG_DIRECTED_SCAN = 1
+// Whether PNO event shall be triggered if the network is found on A band
+#define WIFI_PNO_FLAG_A_BAND = 2
+// Whether PNO event shall be triggered if the network is found on G band
+#define WIFI_PNO_FLAG_G_BAND = 4
+// Whether strict matching is required (i.e. firmware shall not match on the entire SSID)
+#define WIFI_PNO_FLAG_STRICT_MATCH = 8
// Code for matching the beacon AUTH IE - additional codes TBD
#define WIFI_PNO_AUTH_CODE_OPEN 1 // open
#define WIFI_PNO_AUTH_CODE_EAPOL 4 // any EAPOL
// Enhanced PNO:
-// for each network framework will either specify a ssid or a crc32
-// if ssid is specified (i.e. ssid[0] != 0) then crc32 field shall be ignored.
+// Enhanced PNO feature is expected to be enabled all of the time (e.g. screen lit) and may thus
+// requires firmware to store a large number of networks, covering the whole list of known network.
+// Therefore, it is acceptable for firmware to store a crc24, crc32 or other short hash of the SSID,
+// such that a low but non-zero probability of collision exist. With that scheme it should be
+// possible for firmware to keep an entry as small as 4 bytes for each pno network.
+// For instance, a firmware pn0 entry can be implemented in the form of:
+// PNO ENTRY = crc24(3 bytes) | RSSI_THRESHOLD>>3 (5 bits) | auth flags(3 bits)
+//
// A PNO network shall be reported once, that is, once a network is reported by firmware
-// its entry shall be marked as "done" until framework call wifi_set_epno_list.
- // Calling wifi_set_epno_list shall reset the "done" status of pno networks in firmware.
+// its entry shall be marked as "done" until framework calls wifi_set_epno_list again.
+// Calling wifi_set_epno_list shall reset the "done" status of pno networks in firmware.
typedef struct {
- char ssid[32];
- char rssi_threshold; // threshold for considering this SSID as found
- char flags;
- int crc32; // crc32 of the SSID, this allows for memory size optimization
- // i.e. not passing the whole SSID
- // in firmware and instead storing a shorter string
- char auth_bit_field; // auth bitfield for matching WPA IE
+ char ssid[32+1];
+ byte rssi_threshold; // threshold for considering this SSID as found, required granularity for
+ // this threshold is 4dBm to 8dBm
+ byte flags; // WIFI_PNO_FLAG_XXX
+ byte auth_bit_field; // auth bit field for matching WPA IE
} wifi_epno_network;
/* PNO list */
typedef struct {
- int num_networks; // number of SSIDs
+ int num_networks; // number of SSIDs
wifi_epno_network networks[]; // PNO networks
} wifi_epno_params;
typedef struct {
- int network_index; // index of the network found in the pno list
- char ssid[32+1]; // null terminated
- wifi_channel channel;
- int rssi;
-} wifi_epno_result;
-
-
-typedef struct {
// on results
void (*on_network_found)(wifi_request_id id,
- unsigned num_results, wifi_epno_result *results);
+ unsigned num_results, wifi_scan_result *results);
} wifi_epno_handler;
/* SSID white list */
/* Note that this feature requires firmware to be able to indicate to kernel sme and wpa_supplicant
* that the SSID of the network has changed
- * and thus requires further changed in cfg80211 stack, for instance, the below function would change:
+ * and thus requires further changed in cfg80211 stack, for instance,
+ * the below function would change:
void __cfg80211_roamed(struct wireless_dev *wdev,
struct cfg80211_bss *bss,
wifi_error wifi_set_ssid_white_list(wifi_request_id id, wifi_interface_handle iface,
int num_networks, wifi_ssid *ssids);
+/* Set G-SCAN roam parameters */
+/**
+ * Firmware roaming is implemented with two modes:
+ * 1- "Alert" mode roaming, (Note: alert roaming is the pre-L roaming, whereas firmware is
+ * "urgently" hunting for another BSSID because the RSSI is low, or because many successive
+ * beacons have been lost or other bad link conditions).
+ * 2- "Lazy" mode, where firmware is hunting for a better BSSID or white listed SSID even though
+ * the RSSI of the link is good.
+ * Lazy mode is configured thru G-scan, that is, the results of G-scans are compared to the
+ * current RSSI and fed thru the roaming engine.
+ * Lazy scan will be enabled (and or throttled down by reducing the number of G-scans) by
+ * framework only in certain conditions, such as:
+ * - no real time (VO/VI) traffic at the interface
+ * - low packet rate for BE/BK packets a the interface
+ * - system conditions (screen lit/dark) etc...
+ *
+ * For consistency, the roam parameters will always be configured by framework such that:
+ *
+ * condition 1- A_band_boost_threshold >= (alert_roam_rssi_trigger + 10)
+ * This condition ensures that Lazy roam doesn't cause the device to roam to a 5GHz BSSID whose RSSI
+ * is lower than the alert threshold, which would consequently trigger a roam to a low RSSI BSSID,
+ * hence triggering alert mode roaming.
+ * In other words, in alert mode, the A_band parameters may safely be ignored by WiFi chipset.
+ *
+ * condition 2- A_band_boost_threshold > A_band_penalty_factor
+ *
+ */
+
+/**
+ * Example:
+ * A_band_boost_threshold = -65
+ * A_band_penalty_threshold = -75
+ * A_band_boost_factor = 4
+ * A_band_penalty_factor = 2
+ * A_band_max_boost = 50
+ *
+ * a 5GHz RSSI value is transformed as below:
+ * -20 -> -20+ 50 = 30
+ * -60 -> -60 + 4 * (-60 - A_band_boost_threshold) = -60 + 16 = -44
+ * -70 -> -70
+ * -80 -> -80 - 2 * (A_band_penalty_threshold - (-80)) = -80 - 10 = -90
+ */
+
typedef struct {
- int max_number_epno_networks_by_crc32; //max number of epno entries if crc32 is specified
- int max_number_epno_networks_by_ssid; //max number of epno entries if ssid is specified
- int max_number_of_white_losted_ssid; //max number of white listed SSIDs, M target is 2 to 4 */
-} wifi_roam_autojoin_offload_capabilities;
+ // Lazy roam parameters
+ // A_band_XX parameters are applied to 5GHz BSSIDs when comparing with a 2.4GHz BSSID
+ // they may not be applied when comparing two 5GHz BSSIDs
+ int A_band_boost_threshold; // RSSI threshold above which 5GHz RSSI is favored
+ int A_band_penalty_threshold; // RSSI threshold below which 5GHz RSSI is penalized
+ int A_band_boost_factor; // factor by which 5GHz RSSI is boosted
+ // boost=RSSI_measured-5GHz_boost_threshold)*5GHz_boost_factor
+ int A_band_penalty_factor; // factor by which 5GHz RSSI is penalized
+ // penalty=(5GHz_penalty_factor-RSSI_measured)*5GHz_penalty_factor
+ int A_band_max_boost; // maximum boost that can be applied to a 5GHz RSSI
+
+ // Hysteresis: ensuring the currently associated BSSID is favored
+ // so as to prevent ping-pong situations
+ int lazy_roam_hysteresis; // boost applied to current BSSID
+
+ // Alert mode enable, i.e. configuring when firmware enters alert mode
+ int alert_roam_rssi_trigger; // RSSI below which "Alert" roam is enabled
+} wifi_roam_params;
+
+wifi_error wifi_set_gscan_roam_params(wifi_request_id id, wifi_interface_handle iface,
+ wifi_roam_params * params);
+
+/**
+ * Enable/Disable "Lazy" roam
+ */
+wifi_error wifi_enable_lazy_roam(wifi_request_id id, wifi_interface_handle iface, int enable);
+
+/**
+ * Per BSSID preference
+ */
+typedef struct {
+ mac_addr bssid;
+ int rssi_modifier; // modifier applied to the RSSI of the BSSID for the purpose of comparing
+ // it with other roam candidate
+} wifi_bssid_preference;
-wifi_error wifi_get_roam_autojoin_offload_capabilities(wifi_interface_handle handle,
- wifi_roam_autojoin_offload_capabilities *capabilities);
+wifi_error wifi_set_bssid_preference(wifi_request_id id, wifi_interface_handle iface,
+ int num_bssid, wifi_bssid_preference *prefs);
+
+typedef struct {
+ int id; // identifier of this network block, report this in event
+ char realm[256]; // null terminated UTF8 encoded realm, 0 if unspecified
+ int64_t roamingConsortiumIds[16]; // roaming consortium ids to match, 0s if unspecified
+ byte plmn[3]; // mcc/mnc combination as per rules, 0s if unspecified
+} wifi_passpoint_network;
+
+typedef struct {
+ void (*on_passpoint_network_found)(
+ wifi_request_id id,
+ int net_id, // network block identifier for the matched network
+ wifi_scan_result *result, // scan result, with channel and beacon information
+ int anqp_len, // length of ANQP blob
+ byte *anqp // ANQP data, in the information_element format
+ );
+} wifi_passpoint_event_handler;
+
+/* Sets a list for passpoint networks for PNO purposes; it should be matched
+ * against any passpoint networks (designated by Interworking element) found
+ * during regular PNO scan. */
+wifi_error wifi_set_passpoint_list(wifi_request_id id, wifi_interface_handle iface, int num,
+ wifi_passpoint_network *networks, wifi_passpoint_event_handler handler);
+
+/* Reset passpoint network list - no Passpoint networks should be matched after this */
+wifi_error wifi_reset_passpoint_list(wifi_request_id id, wifi_interface_handle iface);
#endif
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