wifi: iwlwifi: mvm: Introduce internal MLO passive scan

Add a new scan type that can be used for internal MLO purposes, i.e.,
in case updated BSS information is required. Currently only passive
scanning is supported.

Signed-off-by: Ilan Peer <ilan.peer@intel.com>
Reviewed-by: Johannes Berg <johannes.berg@intel.com>
Reviewed-by: Ayala Beker <ayala.beker@intel.com>
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>
Link: https://msgid.link/20240319100755.5ce3e756cf8f.I4a41065f6b3a6ec6c6e44e83bc97c277ff7c599e@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c

@@ -1340,6 +1340,11 @@ void iwl_mvm_mac_stop(struct ieee80211_hw *hw)
 {
 	struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw);
 
+	/* Stop internal MLO scan, if running */
+	mutex_lock(&mvm->mutex);
+	iwl_mvm_scan_stop(mvm, IWL_MVM_SCAN_INT_MLO, false);
+	mutex_unlock(&mvm->mutex);
+
 	flush_work(&mvm->async_handlers_wk);
 	flush_work(&mvm->add_stream_wk);
 

drivers/net/wireless/intel/iwlwifi/mvm/mvm.h

@@ -493,10 +493,12 @@ enum iwl_scan_status {
 	IWL_MVM_SCAN_REGULAR		= BIT(0),
 	IWL_MVM_SCAN_SCHED		= BIT(1),
 	IWL_MVM_SCAN_NETDETECT		= BIT(2),
+	IWL_MVM_SCAN_INT_MLO		= BIT(3),
 
 	IWL_MVM_SCAN_STOPPING_REGULAR	= BIT(8),
 	IWL_MVM_SCAN_STOPPING_SCHED	= BIT(9),
 	IWL_MVM_SCAN_STOPPING_NETDETECT	= BIT(10),
+	IWL_MVM_SCAN_STOPPING_INT_MLO	= BIT(11),
 
 	IWL_MVM_SCAN_REGULAR_MASK	= IWL_MVM_SCAN_REGULAR |
 					  IWL_MVM_SCAN_STOPPING_REGULAR,
@@ -504,6 +506,8 @@ enum iwl_scan_status {
 					  IWL_MVM_SCAN_STOPPING_SCHED,
 	IWL_MVM_SCAN_NETDETECT_MASK	= IWL_MVM_SCAN_NETDETECT |
 					  IWL_MVM_SCAN_STOPPING_NETDETECT,
+	IWL_MVM_SCAN_INT_MLO_MASK       = IWL_MVM_SCAN_INT_MLO |
+					  IWL_MVM_SCAN_STOPPING_INT_MLO,
 
 	IWL_MVM_SCAN_STOPPING_MASK	= 0xff << IWL_MVM_SCAN_STOPPING_SHIFT,
 	IWL_MVM_SCAN_MASK		= 0xff,
@@ -2007,6 +2011,10 @@ int iwl_mvm_reg_scan_start(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
 			   struct ieee80211_scan_ies *ies);
 size_t iwl_mvm_scan_size(struct iwl_mvm *mvm);
 int iwl_mvm_scan_stop(struct iwl_mvm *mvm, int type, bool notify);
+int iwl_mvm_int_mlo_scan_start(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
+			       struct ieee80211_channel **channels,
+			       size_t n_channels);
+
 int iwl_mvm_max_scan_ie_len(struct iwl_mvm *mvm);
 void iwl_mvm_report_scan_aborted(struct iwl_mvm *mvm);
 void iwl_mvm_scan_timeout_wk(struct work_struct *work);

drivers/net/wireless/intel/iwlwifi/mvm/scan.c

@@ -1377,11 +1377,14 @@ static void iwl_mvm_scan_umac_dwell(struct iwl_mvm *mvm,
 		cmd->ooc_priority = cpu_to_le32(IWL_SCAN_PRIORITY_EXT_2);
 }
 
-static u32 iwl_mvm_scan_umac_ooc_priority(struct iwl_mvm_scan_params *params)
+static u32 iwl_mvm_scan_umac_ooc_priority(int type)
 {
-	return iwl_mvm_is_regular_scan(params) ?
+	if (type == IWL_MVM_SCAN_REGULAR)
-		IWL_SCAN_PRIORITY_EXT_6 :
+		return IWL_SCAN_PRIORITY_EXT_6;
-		IWL_SCAN_PRIORITY_EXT_2;
+	if (type == IWL_MVM_SCAN_INT_MLO)
+		return IWL_SCAN_PRIORITY_EXT_4;
+
+	return IWL_SCAN_PRIORITY_EXT_2;
 }
 
 static void
@@ -2452,7 +2455,7 @@ static int iwl_mvm_scan_umac_v12(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
 
 	mvm->scan_uid_status[uid] = type;
 
-	cmd->ooc_priority = cpu_to_le32(iwl_mvm_scan_umac_ooc_priority(params));
+	cmd->ooc_priority = cpu_to_le32(iwl_mvm_scan_umac_ooc_priority(type));
 	cmd->uid = cpu_to_le32(uid);
 
 	gen_flags = iwl_mvm_scan_umac_flags_v2(mvm, params, vif, type);
@@ -2489,7 +2492,7 @@ static int iwl_mvm_scan_umac_v14_and_above(struct iwl_mvm *mvm,
 
 	mvm->scan_uid_status[uid] = type;
 
-	cmd->ooc_priority = cpu_to_le32(iwl_mvm_scan_umac_ooc_priority(params));
+	cmd->ooc_priority = cpu_to_le32(iwl_mvm_scan_umac_ooc_priority(type));
 	cmd->uid = cpu_to_le32(uid);
 
 	gen_flags = iwl_mvm_scan_umac_flags_v2(mvm, params, vif, type);
@@ -3006,14 +3009,16 @@ static int _iwl_mvm_single_scan_start(struct iwl_mvm *mvm,
 
 	IWL_DEBUG_SCAN(mvm, "Scan request was sent successfully\n");
 	mvm->scan_status |= type;
+
+	if (type == IWL_MVM_SCAN_REGULAR) {
 		mvm->scan_vif = iwl_mvm_vif_from_mac80211(vif);
+		schedule_delayed_work(&mvm->scan_timeout_dwork,
+				      msecs_to_jiffies(SCAN_TIMEOUT));
+	}
 
 	if (params.enable_6ghz_passive)
 		mvm->last_6ghz_passive_scan_jiffies = jiffies;
 
-	schedule_delayed_work(&mvm->scan_timeout_dwork,
-			      msecs_to_jiffies(SCAN_TIMEOUT));
-
 	return 0;
 }
 
@@ -3189,6 +3194,8 @@ void iwl_mvm_rx_umac_scan_complete_notif(struct iwl_mvm *mvm,
 	} else if (mvm->scan_uid_status[uid] == IWL_MVM_SCAN_SCHED) {
 		ieee80211_sched_scan_stopped(mvm->hw);
 		mvm->sched_scan_pass_all = SCHED_SCAN_PASS_ALL_DISABLED;
+	} else if (mvm->scan_uid_status[uid] == IWL_MVM_SCAN_INT_MLO) {
+		IWL_DEBUG_SCAN(mvm, "Internal MLO scan completed\n");
 	}
 
 	mvm->scan_status &= ~mvm->scan_uid_status[uid];
@@ -3375,6 +3382,12 @@ void iwl_mvm_report_scan_aborted(struct iwl_mvm *mvm)
 			mvm->sched_scan_pass_all = SCHED_SCAN_PASS_ALL_DISABLED;
 			mvm->scan_uid_status[uid] = 0;
 		}
+		uid = iwl_mvm_scan_uid_by_status(mvm, IWL_MVM_SCAN_INT_MLO);
+		if (uid >= 0) {
+			IWL_DEBUG_SCAN(mvm, "Internal MLO scan aborted\n");
+			mvm->scan_uid_status[uid] = 0;
+		}
+
 		uid = iwl_mvm_scan_uid_by_status(mvm,
 						 IWL_MVM_SCAN_STOPPING_REGULAR);
 		if (uid >= 0)
@@ -3385,6 +3398,11 @@ void iwl_mvm_report_scan_aborted(struct iwl_mvm *mvm)
 		if (uid >= 0)
 			mvm->scan_uid_status[uid] = 0;
 
+		uid = iwl_mvm_scan_uid_by_status(mvm,
+						 IWL_MVM_SCAN_STOPPING_INT_MLO);
+		if (uid >= 0)
+			mvm->scan_uid_status[uid] = 0;
+
 		/* We shouldn't have any UIDs still set.  Loop over all the
 		 * UIDs to make sure there's nothing left there and warn if
 		 * any is found.
@@ -3456,3 +3474,50 @@ out:
 
 	return ret;
 }
+
+int iwl_mvm_int_mlo_scan_start(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
+			       struct ieee80211_channel **channels,
+			       size_t n_channels)
+{
+	struct cfg80211_scan_request *req = NULL;
+	struct ieee80211_scan_ies ies = {};
+	size_t size, i;
+	int ret;
+
+	lockdep_assert_held(&mvm->mutex);
+
+	IWL_DEBUG_SCAN(mvm, "Starting Internal MLO scan: n_channels=%zu\n",
+		       n_channels);
+
+	if (!vif->cfg.assoc || !ieee80211_vif_is_mld(vif))
+		return -EINVAL;
+
+	size = struct_size(req, channels, n_channels);
+	req = kzalloc(size, GFP_KERNEL);
+	if (!req)
+		return -ENOMEM;
+
+	/* set the requested channels */
+	for (i = 0; i < n_channels; i++)
+		req->channels[i] = channels[i];
+
+	req->n_channels = n_channels;
+
+	/* set the rates */
+	for (i = 0; i < NUM_NL80211_BANDS; i++)
+		if (mvm->hw->wiphy->bands[i])
+			req->rates[i] =
+				(1 << mvm->hw->wiphy->bands[i]->n_bitrates) - 1;
+
+	req->wdev = ieee80211_vif_to_wdev(vif);
+	req->wiphy = mvm->hw->wiphy;
+	req->scan_start = jiffies;
+	req->tsf_report_link_id = -1;
+
+	ret = _iwl_mvm_single_scan_start(mvm, vif, req, &ies,
+					 IWL_MVM_SCAN_INT_MLO);
+	kfree(req);
+
+	IWL_DEBUG_SCAN(mvm, "Internal MLO scan: ret=%d\n", ret);
+	return ret;
+}