wifi: ath12k: Introduce the container for mac80211 hw

To support multi link operation, we need to combine all the link/pdev
under a single wiphy. This avoids the overhead of synchronization
across multiple hardware instances in both the cfg80211 and mac80211
layers. Currently, each link/pdev is registered as separate wiphy,
tightly coupled with link/pdev/radio (ar) structure. To enable single
wiphy registration within the chip, we decouple the wiphy data entity from
the link/pdev/radio (ar) structure and move it under the chip (ab)
structure with a new data container (ath12k_hw) structure. This approach
improves scalability for future multi link operation support.

		mac80211 hw private data structure diagram
		------------------------------------------

	Now						After

 +---------------------+                          +---------------------+
 |mac80211 hw priv data|                          |mac80211 hw priv data|
 |                     |                          |                     |
 |                     |                          |                     |
 |                     |                          |                     |
 |                     |                          |   ath12k_hw (ah)    |
 |                     |                          |                     |
 |                     |  +------------------->   |                     |
 |    ath12k (ar)      |                          |   +-------------+   |
 |                     |                          |   |             |   |
 |                     |                          |   | ath12k (ar) |   |
 |                     |                          |   |             |   |
 |                     |                          |   |             |   |
 |                     |                          |   +-------------+   |
 |                     |                          |                     |
 |                     |                          |                     |
 +---------------------+                          +---------------------+

Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.0.1-00029-QCAHKSWPL_SILICONZ-1
Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.0.c5-00481-QCAHMTSWPL_V1.0_V2.0_SILICONZ-3
Signed-off-by: Karthikeyan Periyasamy <quic_periyasa@quicinc.com>
Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Link: https://msgid.link/20240118010320.3918136-3-quic_periyasa@quicinc.com

drivers/net/wireless/ath/ath12k/core.c

@@ -923,6 +923,7 @@ static void ath12k_core_pre_reconfigure_recovery(struct ath12k_base *ab)
 {
 	struct ath12k *ar;
 	struct ath12k_pdev *pdev;
+	struct ath12k_hw *ah;
 	int i;
 
 	spin_lock_bh(&ab->base_lock);
@@ -932,13 +933,20 @@ static void ath12k_core_pre_reconfigure_recovery(struct ath12k_base *ab)
 	if (ab->is_reset)
 		set_bit(ATH12K_FLAG_CRASH_FLUSH, &ab->dev_flags);
 
+	for (i = 0; i < ab->num_hw; i++) {
+		if (!ab->ah[i])
+			continue;
+
+		ah = ab->ah[i];
+		ieee80211_stop_queues(ah->hw);
+	}
+
 	for (i = 0; i < ab->num_radios; i++) {
 		pdev = &ab->pdevs[i];
 		ar = pdev->ar;
 		if (!ar || ar->state == ATH12K_STATE_OFF)
 			continue;
 
-		ieee80211_stop_queues(ath12k_ar_to_hw(ar));
 		ath12k_mac_drain_tx(ar);
 		complete(&ar->scan.started);
 		complete(&ar->scan.completed);

drivers/net/wireless/ath/ath12k/core.h

@@ -473,7 +473,7 @@ struct ath12k_per_peer_tx_stats {
 struct ath12k {
 	struct ath12k_base *ab;
 	struct ath12k_pdev *pdev;
-	struct ieee80211_hw *hw;
+	struct ath12k_hw *ah;
 	struct ath12k_wmi_pdev *wmi;
 	struct ath12k_pdev_dp dp;
 	u8 mac_addr[ETH_ALEN];
@@ -537,6 +537,7 @@ struct ath12k {
 	/* pdev_idx starts from 0 whereas pdev->pdev_id starts with 1 */
 	u8 pdev_idx;
 	u8 lmac_id;
+	u8 hw_link_id;
 
 	struct completion peer_assoc_done;
 	struct completion peer_delete_done;
@@ -596,6 +597,13 @@ struct ath12k {
 	int monitor_vdev_id;
 };
 
+struct ath12k_hw {
+	struct ieee80211_hw *hw;
+
+	u8 num_radio;
+	struct ath12k radio[] __aligned(sizeof(void *));
+};
+
 struct ath12k_band_cap {
 	u32 phy_id;
 	u32 max_bw_supported;
@@ -729,6 +737,16 @@ struct ath12k_base {
 	u8 fw_pdev_count;
 
 	struct ath12k_pdev __rcu *pdevs_active[MAX_RADIOS];
+
+	/* Holds information of wiphy (hw) registration.
+	 *
+	 * In Multi/Single Link Operation case, all pdevs are registered as
+	 * a single wiphy. In other (legacy/Non-MLO) cases, each pdev is
+	 * registered as separate wiphys.
+	 */
+	struct ath12k_hw *ah[MAX_RADIOS];
+	u8 num_hw;
+
 	struct ath12k_wmi_hal_reg_capabilities_ext_arg hal_reg_cap[MAX_RADIOS];
 	unsigned long long free_vdev_map;
 	unsigned long long free_vdev_stats_id_map;
@@ -810,6 +828,11 @@ struct ath12k_base {
 	u8 drv_priv[] __aligned(sizeof(void *));
 };
 
+struct ath12k_pdev_map {
+	struct ath12k_base *ab;
+	u8 pdev_idx;
+};
+
 int ath12k_core_qmi_firmware_ready(struct ath12k_base *ab);
 int ath12k_core_pre_init(struct ath12k_base *ab);
 int ath12k_core_init(struct ath12k_base *ath12k);
@@ -896,8 +919,18 @@ static inline const char *ath12k_bus_str(enum ath12k_bus bus)
 	return "unknown";
 }
 
+static inline struct ath12k_hw *ath12k_hw_to_ah(struct ieee80211_hw  *hw)
+{
+	return hw->priv;
+}
+
+static inline struct ath12k *ath12k_ah_to_ar(struct ath12k_hw *ah)
+{
+	return ah->radio;
+}
+
 static inline struct ieee80211_hw *ath12k_ar_to_hw(struct ath12k *ar)
 {
-	return ar->hw;
+	return ar->ah->hw;
 }
 #endif /* _CORE_H_ */

drivers/net/wireless/ath/ath12k/mac.h

 /* SPDX-License-Identifier: BSD-3-Clause-Clear */
 /*
  * Copyright (c) 2018-2021 The Linux Foundation. All rights reserved.
- * Copyright (c) 2021-2023 Qualcomm Innovation Center, Inc. All rights reserved.
+ * Copyright (c) 2021-2024 Qualcomm Innovation Center, Inc. All rights reserved.
  */
 
 #ifndef ATH12K_MAC_H
@@ -12,6 +12,8 @@
 
 struct ath12k;
 struct ath12k_base;
+struct ath12k_hw;
+struct ath12k_pdev_map;
 
 struct ath12k_generic_iter {
 	struct ath12k *ar;

drivers/net/wireless/ath/ath12k/reg.c

@@ -48,7 +48,8 @@ ath12k_reg_notifier(struct wiphy *wiphy, struct regulatory_request *request)
 {
 	struct ieee80211_hw *hw = wiphy_to_ieee80211_hw(wiphy);
 	struct ath12k_wmi_init_country_arg arg;
-	struct ath12k *ar = hw->priv;
+	struct ath12k_hw *ah = ath12k_hw_to_ah(hw);
+	struct ath12k *ar = ath12k_ah_to_ar(ah);
 	int ret;
 
 	ath12k_dbg(ar->ab, ATH12K_DBG_REG,