[PATCH wireless-next v3 06/15] wifi: cfg80211: add proximity detection capabilities to PMSR

[Peddolla Harshavardhan Reddy <peddolla.reddy@oss.qualcomm.com>]

Introduce Proximity Detection (PD) capabilities in Peer Measurement
Service (PMSR) as defined in the Wi-Fi Alliance specification
"Proximity Ranging (PR) Implementation Consideration Draft 1.9 Rev 1
section 3.3". This enables devices to advertise PD support and
concurrent ISTA/RSTA operation for simultaneous initiator and
responder roles.

Extend FTM capabilities to support PASN negotiation and device timing
constraints. Add antenna configuration for PR Element during PASN
negotiation as per the specification. Add ranging interval limits to
advertise device timing capabilities for EDCA and NTB-based ranging.
Add EDCA-based responder support to indicate if the device can operate
as FTM responder for EDCA-based ranging. These capabilities allow
proper negotiation and validation of PD sessions between peers.

Signed-off-by: Peddolla Harshavardhan Reddy <peddolla.reddy@oss.qualcomm.com>
---
 include/net/cfg80211.h       | 28 ++++++++++++++++++++++++++--
 include/uapi/linux/nl80211.h | 29 +++++++++++++++++++++++++++++
 net/wireless/nl80211.c       | 29 +++++++++++++++++++++++++++++
 net/wireless/pmsr.c          |  3 ++-
 4 files changed, 86 insertions(+), 3 deletions(-)

diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 099a2ff9af58..62a2139b2f37 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -5692,6 +5692,13 @@ cfg80211_get_iftype_ext_capa(struct wiphy *wiphy, enum nl80211_iftype type);
  * @max_peers: maximum number of peers in a single measurement
  * @report_ap_tsf: can report assoc AP's TSF for radio resource measurement
  * @randomize_mac_addr: can randomize MAC address for measurement
+ * @pd_support: supports peer-to-peer ranging as mentioned in the specification
+ *	"PR Implementation Consideration Draft 1.9 rev 1" where PD stands for
+ *	proximity detection
+ * @pd_concurrent_ista_rsta_support: As the peer measurement request can be a
+ *	multi-peer request this will indicate if the device can act
+ *	simultaneously as initiator and a responder. Only valid if @pd_support
+ *	is set.
  * @ftm: FTM measurement data
  * @ftm.supported: FTM measurement is supported
  * @ftm.asap: ASAP-mode is supported
@@ -5718,12 +5725,24 @@ 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.max_no_of_tx_antennas: maximum number of transmit antennas supported for
+ *	ranging
+ * @ftm.max_no_of_rx_antennas: maximum number of receive antennas supported for
+ *	ranging
+ * @ftm.min_allowed_ranging_interval_edca: Minimum EDCA ranging
+ *	interval supported by the device in milli seconds. (0 means unknown)
+ * @ftm.min_allowed_ranging_interval_ntb: Minimum NTB ranging
+ *	interval supported by the device in milli seconds. (0 means unknown)
  * @ftm.support_rsta: supports operating as RSTA in PMSR FTM request
+ * @ftm.support_edca_responder: supports operating as FTM responder in PMSR FTM
+ *	request for EDCA-based ranging
  */
 struct cfg80211_pmsr_capabilities {
 	unsigned int max_peers;
 	u8 report_ap_tsf:1,
-	   randomize_mac_addr:1;
+	   randomize_mac_addr:1,
+	   pd_support:1,
+	   pd_concurrent_ista_rsta_support:1;
 
 	struct {
 		u32 preambles;
@@ -5744,7 +5763,12 @@ struct cfg80211_pmsr_capabilities {
 		u8 max_rx_sts;
 		u8 max_total_ltf_tx;
 		u8 max_total_ltf_rx;
-		u8 support_rsta:1;
+		u32 max_no_of_tx_antennas;
+		u32 max_no_of_rx_antennas;
+		u32 min_allowed_ranging_interval_edca;
+		u32 min_allowed_ranging_interval_ntb;
+		u8 support_rsta:1,
+		   support_edca_responder:1;
 	} ftm;
 };
 
diff --git a/include/uapi/linux/nl80211.h b/include/uapi/linux/nl80211.h
index 55a882535e2b..59e8ba9c37c4 100644
--- a/include/uapi/linux/nl80211.h
+++ b/include/uapi/linux/nl80211.h
@@ -7829,6 +7829,15 @@ enum nl80211_peer_measurement_peer_attrs {
  *	meaningless, just a list of peers to measure with, with the
  *	sub-attributes taken from
  *	&enum nl80211_peer_measurement_peer_attrs.
+ * @NL80211_PMSR_ATTR_PD_SUPPORT: flag attribute in capability indicating
+ *	that the device supports peer-to-peer ranging as mentioned in the
+ *	specification "PR Implementation Consideration Draft 1.9 rev 1" where
+ *	PD stands for proximity detection
+ * @NL80211_PMSR_ATTR_PD_CONCURRENT_ISTA_RSTA_SUPPORT: flag attribute in
+ *	capability indicating that as the peer measurement request can be a
+ *	multi-peer request, the device can act simultaneously as initiator and
+ *	a responder, where the multiple requests are being processed
+ *	simultaneously
  *
  * @NUM_NL80211_PMSR_ATTR: internal
  * @NL80211_PMSR_ATTR_MAX: highest attribute number
@@ -7841,6 +7850,8 @@ enum nl80211_peer_measurement_attrs {
 	NL80211_PMSR_ATTR_RANDOMIZE_MAC_ADDR,
 	NL80211_PMSR_ATTR_TYPE_CAPA,
 	NL80211_PMSR_ATTR_PEERS,
+	NL80211_PMSR_ATTR_PD_SUPPORT,
+	NL80211_PMSR_ATTR_PD_CONCURRENT_ISTA_RSTA_SUPPORT,
 
 	/* keep last */
 	NUM_NL80211_PMSR_ATTR,
@@ -7899,6 +7910,19 @@ enum nl80211_peer_measurement_attrs {
  *	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
+ * @NL80211_PMSR_FTM_CAPA_ATTR_EDCA_BASED_RESPONDER: flag attribute indicating
+ *	the device supports operating as the Responder in PMSR FTM request for
+ *	EDCA-based ranging.
+ * @NL80211_PMSR_FTM_CAPA_ATTR_MAX_NUM_TX_ANTENNAS: u32 attribute indicating
+ *	the maximum number of transmit antennas supported for ranging
+ * @NL80211_PMSR_FTM_CAPA_ATTR_MAX_NUM_RX_ANTENNAS: u32 attribute indicating
+ *	the maximum number of receive antennas supported for ranging
+ * @NL80211_PMSR_FTM_CAPA_ATTR_MIN_INTERVAL_EDCA: u32 attribute indicating
+ *	the minimum EDCA ranging interval supported by the device
+ *	in milli seconds. (0 means unknown)
+ * @NL80211_PMSR_FTM_CAPA_ATTR_MIN_INTERVAL_NTB: u32 attribute indicating
+ *	the minimum NTB ranging interval supported by the device
+ *	in milli seconds. (0 means unknown)
  *
  * @NUM_NL80211_PMSR_FTM_CAPA_ATTR: internal
  * @NL80211_PMSR_FTM_CAPA_ATTR_MAX: highest attribute number
@@ -7924,6 +7948,11 @@ enum nl80211_peer_measurement_ftm_capa {
 	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,
+	NL80211_PMSR_FTM_CAPA_ATTR_EDCA_BASED_RESPONDER,
+	NL80211_PMSR_FTM_CAPA_ATTR_MAX_NUM_TX_ANTENNAS,
+	NL80211_PMSR_FTM_CAPA_ATTR_MAX_NUM_RX_ANTENNAS,
+	NL80211_PMSR_FTM_CAPA_ATTR_MIN_INTERVAL_EDCA,
+	NL80211_PMSR_FTM_CAPA_ATTR_MIN_INTERVAL_NTB,
 
 	/* keep last */
 	NUM_NL80211_PMSR_FTM_CAPA_ATTR,
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 0ae96063c032..4fbc2c8ff395 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -398,6 +398,7 @@ nl80211_pmsr_peer_attr_policy[NL80211_PMSR_PEER_ATTR_MAX + 1] = {
 
 static const struct nla_policy
 nl80211_pmsr_attr_policy[NL80211_PMSR_ATTR_MAX + 1] = {
+	[0] = { .strict_start_type = NL80211_PMSR_ATTR_PD_SUPPORT },
 	[NL80211_PMSR_ATTR_MAX_PEERS] = { .type = NLA_REJECT },
 	[NL80211_PMSR_ATTR_REPORT_AP_TSF] = { .type = NLA_REJECT },
 	[NL80211_PMSR_ATTR_RANDOMIZE_MAC_ADDR] = { .type = NLA_REJECT },
@@ -2375,6 +2376,25 @@ nl80211_send_pmsr_ftm_capa(const struct cfg80211_pmsr_capabilities *cap,
 	if (cap->ftm.support_rsta &&
 	    nla_put_flag(msg, NL80211_PMSR_FTM_CAPA_ATTR_RSTA_SUPPORT))
 		return -ENOBUFS;
+	if (cap->ftm.support_edca_responder &&
+	    nla_put_flag(msg, NL80211_PMSR_FTM_CAPA_ATTR_EDCA_BASED_RESPONDER))
+		return -ENOBUFS;
+	if (cap->ftm.max_no_of_tx_antennas &&
+	    nla_put_u32(msg, NL80211_PMSR_FTM_CAPA_ATTR_MAX_NUM_TX_ANTENNAS,
+			cap->ftm.max_no_of_tx_antennas))
+		return -ENOBUFS;
+	if (cap->ftm.max_no_of_rx_antennas &&
+	    nla_put_u32(msg, NL80211_PMSR_FTM_CAPA_ATTR_MAX_NUM_RX_ANTENNAS,
+			cap->ftm.max_no_of_rx_antennas))
+		return -ENOBUFS;
+	if (cap->ftm.min_allowed_ranging_interval_edca &&
+	    nla_put_u32(msg, NL80211_PMSR_FTM_CAPA_ATTR_MIN_INTERVAL_EDCA,
+			cap->ftm.min_allowed_ranging_interval_edca))
+		return -ENOBUFS;
+	if (cap->ftm.min_allowed_ranging_interval_ntb &&
+	    nla_put_u32(msg, NL80211_PMSR_FTM_CAPA_ATTR_MIN_INTERVAL_NTB,
+			cap->ftm.min_allowed_ranging_interval_ntb))
+		return -ENOBUFS;
 
 	nla_nest_end(msg, ftm);
 	return 0;
@@ -2409,6 +2429,15 @@ static int nl80211_send_pmsr_capa(struct cfg80211_registered_device *rdev,
 	    nla_put_flag(msg, NL80211_PMSR_ATTR_RANDOMIZE_MAC_ADDR))
 		return -ENOBUFS;
 
+	if (cap->pd_support) {
+		if (nla_put_flag(msg, NL80211_PMSR_ATTR_PD_SUPPORT))
+			return -ENOBUFS;
+
+		if (cap->pd_concurrent_ista_rsta_support &&
+		    nla_put_flag(msg,
+				 NL80211_PMSR_ATTR_PD_CONCURRENT_ISTA_RSTA_SUPPORT))
+			return -ENOBUFS;
+	}
 	caps = nla_nest_start_noflag(msg, NL80211_PMSR_ATTR_TYPE_CAPA);
 	if (!caps)
 		return -ENOBUFS;
diff --git a/net/wireless/pmsr.c b/net/wireless/pmsr.c
index c2977a37add2..17f0b1c97d58 100644
--- a/net/wireless/pmsr.c
+++ b/net/wireless/pmsr.c
@@ -188,7 +188,8 @@ static int pmsr_parse_ftm(struct cfg80211_registered_device *rdev,
 	}
 
 	out->ftm.rsta = !!tb[NL80211_PMSR_FTM_REQ_ATTR_RSTA];
-	if (out->ftm.rsta && !capa->ftm.support_rsta) {
+	if (out->ftm.rsta && !capa->ftm.support_rsta &&
+	    !capa->ftm.support_edca_responder) {
 		NL_SET_ERR_MSG_ATTR(info->extack,
 				    tb[NL80211_PMSR_FTM_REQ_ATTR_RSTA],
 				    "FTM: RSTA not supported by device");
-- 
2.34.1