mac80211_hwsim: add PMSR report support via virtio

PMSR (a.k.a. peer measurement) is generalized measurement between two
devices with Wi-Fi support. And currently FTM (a.k.a. fine time measurement
or flight time measurement) is the one and only measurement.

Add the necessary functionality to allow mac80211_hwsim to report PMSR
result. The result would come from the wmediumd, where other Wi-Fi
devices' information are kept. mac80211_hwsim only need to deliver the
result to the userspace.

In detail, add new mac80211_hwsim attributes HWSIM_CMD_REPORT_PMSR, and
HWSIM_ATTR_PMSR_RESULT. When mac80211_hwsim receives the PMSR result with
command HWSIM_CMD_REPORT_PMSR and detail with attribute
HWSIM_ATTR_PMSR_RESULT, received data is parsed to cfg80211_pmsr_result and
resent to the userspace by cfg80211_pmsr_report().

To help receive the details of PMSR result, hwsim_rate_info_attributes is
added to receive rate_info without complex bitrate calculation. (i.e. send
rate_info without adding inverse of nl80211_put_sta_rate()).
Signed-off-by: Jaewan Kim <jaewan@google.com>
Link: https://lore.kernel.org/r/20230322131637.2633968-6-jaewan@google.com
[fix uninitialized return value when there are no reports]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

drivers/net/wireless/virtual/mac80211_hwsim.h

@@ -82,8 +82,8 @@ enum hwsim_tx_control_flags {
  * @HWSIM_CMD_DEL_MAC_ADDR: remove the MAC address again, the attributes
  *	are the same as to @HWSIM_CMD_ADD_MAC_ADDR.
  * @HWSIM_CMD_START_PMSR: request to start peer measurement with the
- *	%HWSIM_ATTR_PMSR_REQUEST.
- * @HWSIM_CMD_ABORT_PMSR: abort previously sent peer measurement
+ *	%HWSIM_ATTR_PMSR_REQUEST. Result will be sent back asynchronously
+ *	with %HWSIM_CMD_REPORT_PMSR.
  * @__HWSIM_CMD_MAX: enum limit
  */
 enum {
@@ -98,6 +98,7 @@ enum {
 	HWSIM_CMD_DEL_MAC_ADDR,
 	HWSIM_CMD_START_PMSR,
 	HWSIM_CMD_ABORT_PMSR,
+	HWSIM_CMD_REPORT_PMSR,
 	__HWSIM_CMD_MAX,
 };
 #define HWSIM_CMD_MAX (_HWSIM_CMD_MAX - 1)
@@ -151,6 +152,8 @@ enum {
  *	to provide peer measurement capabilities. (nl80211_peer_measurement_attrs)
  * @HWSIM_ATTR_PMSR_REQUEST: nested attribute used with %HWSIM_CMD_START_PMSR
  *	to provide details about peer measurement request (nl80211_peer_measurement_attrs)
+ * @HWSIM_ATTR_PMSR_RESULT: nested attributed used with %HWSIM_CMD_REPORT_PMSR
+ *	to provide peer measurement result (nl80211_peer_measurement_attrs)
  * @__HWSIM_ATTR_MAX: enum limit
  */
 
@@ -184,6 +187,7 @@ enum {
 	HWSIM_ATTR_MLO_SUPPORT,
 	HWSIM_ATTR_PMSR_SUPPORT,
 	HWSIM_ATTR_PMSR_REQUEST,
+	HWSIM_ATTR_PMSR_RESULT,
 	__HWSIM_ATTR_MAX,
 };
 #define HWSIM_ATTR_MAX (__HWSIM_ATTR_MAX - 1)
@@ -288,4 +292,47 @@ enum {
 	HWSIM_VQ_RX,
 	HWSIM_NUM_VQS,
 };
+
+/**
+ * enum hwsim_rate_info -- bitrate information.
+ *
+ * Information about a receiving or transmitting bitrate
+ * that can be mapped to struct rate_info
+ *
+ * @HWSIM_RATE_INFO_ATTR_FLAGS: bitflag of flags from &enum rate_info_flags
+ * @HWSIM_RATE_INFO_ATTR_MCS: mcs index if struct describes an HT/VHT/HE rate
+ * @HWSIM_RATE_INFO_ATTR_LEGACY: bitrate in 100kbit/s for 802.11abg
+ * @HWSIM_RATE_INFO_ATTR_NSS: number of streams (VHT & HE only)
+ * @HWSIM_RATE_INFO_ATTR_BW: bandwidth (from &enum rate_info_bw)
+ * @HWSIM_RATE_INFO_ATTR_HE_GI: HE guard interval (from &enum nl80211_he_gi)
+ * @HWSIM_RATE_INFO_ATTR_HE_DCM: HE DCM value
+ * @HWSIM_RATE_INFO_ATTR_HE_RU_ALLOC:  HE RU allocation (from &enum nl80211_he_ru_alloc,
+ *	only valid if bw is %RATE_INFO_BW_HE_RU)
+ * @HWSIM_RATE_INFO_ATTR_N_BOUNDED_CH: In case of EDMG the number of bonded channels (1-4)
+ * @HWSIM_RATE_INFO_ATTR_EHT_GI: EHT guard interval (from &enum nl80211_eht_gi)
+ * @HWSIM_RATE_INFO_ATTR_EHT_RU_ALLOC: EHT RU allocation (from &enum nl80211_eht_ru_alloc,
+ *	only valid if bw is %RATE_INFO_BW_EHT_RU)
+ * @NUM_HWSIM_RATE_INFO_ATTRS: internal
+ * @HWSIM_RATE_INFO_ATTR_MAX: highest attribute number
+ */
+enum hwsim_rate_info_attributes {
+	__HWSIM_RATE_INFO_ATTR_INVALID,
+
+	HWSIM_RATE_INFO_ATTR_FLAGS,
+	HWSIM_RATE_INFO_ATTR_MCS,
+	HWSIM_RATE_INFO_ATTR_LEGACY,
+	HWSIM_RATE_INFO_ATTR_NSS,
+	HWSIM_RATE_INFO_ATTR_BW,
+	HWSIM_RATE_INFO_ATTR_HE_GI,
+	HWSIM_RATE_INFO_ATTR_HE_DCM,
+	HWSIM_RATE_INFO_ATTR_HE_RU_ALLOC,
+	HWSIM_RATE_INFO_ATTR_N_BOUNDED_CH,
+	HWSIM_RATE_INFO_ATTR_EHT_GI,
+	HWSIM_RATE_INFO_ATTR_EHT_RU_ALLOC,
+
+	/* keep last */
+	NUM_HWSIM_RATE_INFO_ATTRS,
+	HWSIM_RATE_INFO_ATTR_MAX = NUM_HWSIM_RATE_INFO_ATTRS - 1
+};
+
 #endif /* __MAC80211_HWSIM_H */