wifi: nl80211/cfg80211: support operating as RSTA in PMSR FTM request

Add an option to operate as the RSTA in an FTM measurement request.
When requested, the device will dwell on the requested channel until
the peer starts the FTM negotiation. This option is only valid for
trigger-based/non trigger-based measurement with LMR feedback which
will allow the RSTA to receive the results of the measurement.

Signed-off-by: Avraham Stern <avraham.stern@intel.com>
Reviewed-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>
Link: https://patch.msgid.link/20260111190221.1f95fc0afab4.Iae2d32783b8e7c4a29089fec0f4c6bce94d303cc@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

2 files changed, 18 insertions, 1 deletions

diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 535fd95b0d83..ac7df439bd24 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -4312,6 +4312,8 @@ struct cfg80211_pmsr_result {
  *		 EDCA based ranging will be used.
  * @lmr_feedback: negotiate for I2R LMR feedback. Only valid if either
  *		 @trigger_based or @non_trigger_based is set.
+ * @rsta: Operate as the RSTA in the measurement. Only valid if @lmr_feedback
+ *	and either @trigger_based or @non_trigger_based is set.
  * @bss_color: the bss color of the responder. Optional. Set to zero to
  *	indicate the driver should set the BSS color. Only valid if
  *	@non_trigger_based or @trigger_based is set.
@@ -4327,7 +4329,8 @@ struct cfg80211_pmsr_ftm_request_peer {
 	   request_civicloc:1,
 	   trigger_based:1,
 	   non_trigger_based:1,
-	   lmr_feedback:1;
+	   lmr_feedback:1,
+	   rsta:1;
 	u8 num_bursts_exp;
 	u8 burst_duration;
 	u8 ftms_per_burst;
@@ -5658,6 +5661,7 @@ cfg80211_get_iftype_ext_capa(struct wiphy *wiphy, enum nl80211_iftype type);
  *	(0 means unknown)
  * @ftm.max_total_ltf_rx: maximum total number of LTFs that can be received
  *	(0 means unknown)
+ * @ftm.support_rsta: supports operating as RSTA in PMSR FTM request
  */
 struct cfg80211_pmsr_capabilities {
 	unsigned int max_peers;
@@ -5683,6 +5687,7 @@ struct cfg80211_pmsr_capabilities {
 		u8 max_rx_sts;
 		u8 max_total_ltf_tx;
 		u8 max_total_ltf_rx;
+		u8 support_rsta:1;
 	} ftm;
 };
 
diff --git a/include/uapi/linux/nl80211.h b/include/uapi/linux/nl80211.h
index 8910b709bfb1..54ddbd9a5459 100644
--- a/include/uapi/linux/nl80211.h
+++ b/include/uapi/linux/nl80211.h
@@ -7812,6 +7812,8 @@ enum nl80211_peer_measurement_attrs {
  *	maximum total number of LTFs the device can receive. The total number
  *	of LTFs is (number of LTF repetitions) * (number of space-time streams).
  *	This limits the allowed combinations of LTF repetitions and STS.
+ * @NL80211_PMSR_FTM_CAPA_ATTR_RSTA_SUPPORT: flag attribute indicating the
+ *	device supports operating as the RSTA in PMSR FTM request
  *
  * @NUM_NL80211_PMSR_FTM_CAPA_ATTR: internal
  * @NL80211_PMSR_FTM_CAPA_ATTR_MAX: highest attribute number
@@ -7836,6 +7838,7 @@ enum nl80211_peer_measurement_ftm_capa {
 	NL80211_PMSR_FTM_CAPA_ATTR_MAX_RX_STS,
 	NL80211_PMSR_FTM_CAPA_ATTR_MAX_TOTAL_LTF_TX,
 	NL80211_PMSR_FTM_CAPA_ATTR_MAX_TOTAL_LTF_RX,
+	NL80211_PMSR_FTM_CAPA_ATTR_RSTA_SUPPORT,
 
 	/* keep last */
 	NUM_NL80211_PMSR_FTM_CAPA_ATTR,
@@ -7888,6 +7891,14 @@ enum nl80211_peer_measurement_ftm_capa {
  * @NL80211_PMSR_FTM_REQ_ATTR_BSS_COLOR: optional. The BSS color of the
  *	responder. Only valid if %NL80211_PMSR_FTM_REQ_ATTR_NON_TRIGGER_BASED
  *	or %NL80211_PMSR_FTM_REQ_ATTR_TRIGGER_BASED is set.
+ * @NL80211_PMSR_FTM_REQ_ATTR_RSTA: optional. Request to perform the measurement
+ *	as the RSTA (flag). When set, the device is expected to dwell on the
+ *	channel specified in %NL80211_PMSR_PEER_ATTR_CHAN until it receives the
+ *	FTM request from the peer or the timeout specified by
+ *	%NL80211_ATTR_TIMEOUT has expired.
+ *	Only valid if %NL80211_PMSR_FTM_REQ_ATTR_LMR_FEEDBACK is set (so the
+ *	RSTA will have the measurement results to report back in the FTM
+ *	response).
  *
  * @NUM_NL80211_PMSR_FTM_REQ_ATTR: internal
  * @NL80211_PMSR_FTM_REQ_ATTR_MAX: highest attribute number
@@ -7908,6 +7919,7 @@ enum nl80211_peer_measurement_ftm_req {
 	NL80211_PMSR_FTM_REQ_ATTR_NON_TRIGGER_BASED,
 	NL80211_PMSR_FTM_REQ_ATTR_LMR_FEEDBACK,
 	NL80211_PMSR_FTM_REQ_ATTR_BSS_COLOR,
+	NL80211_PMSR_FTM_REQ_ATTR_RSTA,
 
 	/* keep last */
 	NUM_NL80211_PMSR_FTM_REQ_ATTR,