[PATCH v2 0/8] wifi: ath12k: handle change_vif_links() callback

[PATCH v2 0/8] wifi: ath12k: handle change_vif_links() callback

[Aditya Kumar Singh]

Currently, links in an interface are allocated during channel assignment
via assign_vif_chanctx(). Conversely, links are deleted during channel
unassignment via unassign_vif_chanctx(). However, deleting links during
channel unassignment does not comply with mac80211 link handling.
Therefore, this process should be managed within change_vif_links().

This series aims to add support to handle links in change_vif_links()
callback.

Patches 1-2 are making debug infra to work without device info.

Patches 3-8 are the ones changing the code to handle as mentioned above.

NOTE:
* A new ath12k-check warning comes which probably needs to be added to
ignore list

drivers/net/wireless/ath/ath12k/debug.c:69: Prefer [subsystem eg: netdev]_dbg([subsystem]dev, ... then dev_dbg(dev, ... then pr_debug(...  to printk(KERN_DEBUG ...

This is because, since device info is not known can not use netdev_ or dev_
dbg family. pr_debug() is an option but that will require DYNAMIC_DEBUG
and then ath12k needs to be probed with dyndbg=+p which we don't want in
ath. Hence, only option left is to use printk() directly.

---
Changes in v2:
- No changes in patches 1-5, 7.
- Relocated ath12k_mac_remove_link_interface() as well in patch 6.
- Properly handled peer create and peer delete symmetry in patch 8. This
  unsymmetry was the root cause of the DFS channel bring up as reported
  with v1.
- Link to v1: https://lore.kernel.org/r/20250204-unlink_link_arvif_from_chanctx-v1-0-675bd4cea339@oss.qualcomm.com

---
Aditya Kumar Singh (8):
      wifi: ath12k: eliminate redundant debug mask check in ath12k_dbg()
      wifi: ath12k: introduce ath12k_generic_dbg()
      wifi: ath12k: remove redundant vif settings during link interface creation
      wifi: ath12k: remove redundant logic for initializing arvif
      wifi: ath12k: use arvif instead of link_conf in ath12k_mac_set_key()
      wifi: ath12k: relocate a few functions in mac.c
      wifi: ath12k: allocate new links in change_vif_links()
      wifi: ath12k: handle link removal in change_vif_links()

 drivers/net/wireless/ath/ath12k/debug.c |   6 +-
 drivers/net/wireless/ath/ath12k/debug.h |   7 +-
 drivers/net/wireless/ath/ath12k/mac.c   | 302 ++++++++++++++++++--------------
 3 files changed, 180 insertions(+), 135 deletions(-)
---
base-commit: 48a62436540224f57013c27519dd2aa3ddd714c9
change-id: 20241210-unlink_link_arvif_from_chanctx-315159c5ac63

[PATCH v2 1/8] wifi: ath12k: eliminate redundant debug mask check in ath12k_dbg()

[Aditya Kumar Singh]

The current implementation includes a debug mask check both in the macro
expansion and in the function __ath12k_dbg(), which is unnecessary.

Simplify the code by removing the redundant check from the helper function
__ath12k_dbg().

While at this, rename the first argument in macro from ar to ab since the
first argument name in the function __ath12k_dbg() is ab.

Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.3.1-00173-QCAHKSWPL_SILICONZ-1

Reviewed-by: Vasanthakumar Thiagarajan <vasanthakumar.thiagarajan@oss.qualcomm.com>
Signed-off-by: Aditya Kumar Singh <aditya.kumar.singh@oss.qualcomm.com>
---
 drivers/net/wireless/ath/ath12k/debug.c | 5 ++---
 drivers/net/wireless/ath/ath12k/debug.h | 4 ++--
 2 files changed, 4 insertions(+), 5 deletions(-)

diff --git a/drivers/net/wireless/ath/ath12k/debug.c b/drivers/net/wireless/ath/ath12k/debug.c
index ff6eaeafa092cd12e572430ed0f1c7aa21b78377..fd9796b5ad3b9feea5c7e78e8a88d361049e08df 100644
--- a/drivers/net/wireless/ath/ath12k/debug.c
+++ b/drivers/net/wireless/ath/ath12k/debug.c
@@ -1,7 +1,7 @@
 // SPDX-License-Identifier: BSD-3-Clause-Clear
 /*
  * Copyright (c) 2018-2021 The Linux Foundation. All rights reserved.
- * Copyright (c) 2021-2024 Qualcomm Innovation Center, Inc. All rights reserved.
+ * Copyright (c) 2021-2025 Qualcomm Innovation Center, Inc. All rights reserved.
  */
 
 #include <linux/vmalloc.h>
@@ -63,8 +63,7 @@ void __ath12k_dbg(struct ath12k_base *ab, enum ath12k_debug_mask mask,
 	vaf.fmt = fmt;
 	vaf.va = &args;
 
-	if (ath12k_debug_mask & mask)
-		dev_printk(KERN_DEBUG, ab->dev, "%pV", &vaf);
+	dev_printk(KERN_DEBUG, ab->dev, "%pV", &vaf);
 
 	/* TODO: trace log */
 
diff --git a/drivers/net/wireless/ath/ath12k/debug.h b/drivers/net/wireless/ath/ath12k/debug.h
index 0aa7c8ccb14ccb9de28a78ca3d2b2a7bf6e481c1..ba0e4da3bb761a49fb81e3efcb61557df8ad1942 100644
--- a/drivers/net/wireless/ath/ath12k/debug.h
+++ b/drivers/net/wireless/ath/ath12k/debug.h
@@ -62,11 +62,11 @@ static inline void ath12k_dbg_dump(struct ath12k_base *ab,
 }
 #endif /* CONFIG_ATH12K_DEBUG */
 
-#define ath12k_dbg(ar, dbg_mask, fmt, ...)			\
+#define ath12k_dbg(ab, dbg_mask, fmt, ...)			\
 do {								\
 	typeof(dbg_mask) mask = (dbg_mask);			\
 	if (ath12k_debug_mask & mask)				\
-		__ath12k_dbg(ar, mask, fmt, ##__VA_ARGS__);	\
+		__ath12k_dbg(ab, mask, fmt, ##__VA_ARGS__);	\
 } while (0)
 
 #endif /* _ATH12K_DEBUG_H_ */

-- 
2.34.1

[PATCH v2 2/8] wifi: ath12k: introduce ath12k_generic_dbg()

[Aditya Kumar Singh]

There might be instances where ath12k_dbg() is needed, but access to
struct ath12k_base (ab) is not readily available. To address this, add
support to print the debug message using printk() when ab is not present.

To avoid the need to explicitly pass NULL each time, introduce a new macro
ath12k_generic_dbg() which resolves to ath12k_dbg() with ab set to NULL.

Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.3.1-00173-QCAHKSWPL_SILICONZ-1

Reviewed-by: Vasanthakumar Thiagarajan <vasanthakumar.thiagarajan@oss.qualcomm.com>
Signed-off-by: Aditya Kumar Singh <aditya.kumar.singh@oss.qualcomm.com>
---
 drivers/net/wireless/ath/ath12k/debug.c | 5 ++++-
 drivers/net/wireless/ath/ath12k/debug.h | 3 +++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/ath/ath12k/debug.c b/drivers/net/wireless/ath/ath12k/debug.c
index fd9796b5ad3b9feea5c7e78e8a88d361049e08df..5ce100cd9a9d16f7fcc2dc0a5522b341ebbff8a3 100644
--- a/drivers/net/wireless/ath/ath12k/debug.c
+++ b/drivers/net/wireless/ath/ath12k/debug.c
@@ -63,7 +63,10 @@ void __ath12k_dbg(struct ath12k_base *ab, enum ath12k_debug_mask mask,
 	vaf.fmt = fmt;
 	vaf.va = &args;
 
-	dev_printk(KERN_DEBUG, ab->dev, "%pV", &vaf);
+	if (likely(ab))
+		dev_printk(KERN_DEBUG, ab->dev, "%pV", &vaf);
+	else
+		printk(KERN_DEBUG "ath12k: %pV", &vaf);
 
 	/* TODO: trace log */
 
diff --git a/drivers/net/wireless/ath/ath12k/debug.h b/drivers/net/wireless/ath/ath12k/debug.h
index ba0e4da3bb761a49fb81e3efcb61557df8ad1942..48916e4e1f6014055bbd56d5c71ef9182c78f3b6 100644
--- a/drivers/net/wireless/ath/ath12k/debug.h
+++ b/drivers/net/wireless/ath/ath12k/debug.h
@@ -69,4 +69,7 @@ do {								\
 		__ath12k_dbg(ab, mask, fmt, ##__VA_ARGS__);	\
 } while (0)
 
+#define ath12k_generic_dbg(dbg_mask, fmt, ...)			\
+	ath12k_dbg(NULL, dbg_mask, fmt, ##__VA_ARGS__)
+
 #endif /* _ATH12K_DEBUG_H_ */

-- 
2.34.1

[PATCH v2 3/8] wifi: ath12k: remove redundant vif settings during link interface creation

[Aditya Kumar Singh]

Currently, vif level settings are done in ath12k_mac_assign_link_vif() as
well as in ath12k_mac_op_add_interface(). Since it is vif level settings,
doing this on per link does not make sense and it contributes to redundant
code. Get rid of this redundant code from ath12k_mac_assign_link_vif().

Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.3.1-00173-QCAHKSWPL_SILICONZ-1

Reviewed-by: Vasanthakumar Thiagarajan <vasanthakumar.thiagarajan@oss.qualcomm.com>
Signed-off-by: Aditya Kumar Singh <aditya.kumar.singh@oss.qualcomm.com>
---
 drivers/net/wireless/ath/ath12k/mac.c | 7 -------
 1 file changed, 7 deletions(-)

diff --git a/drivers/net/wireless/ath/ath12k/mac.c b/drivers/net/wireless/ath/ath12k/mac.c
index 16e6f2fae943d3fa6a46ab1ba6780c9070418279..7defc2b20fb61dcaec06d0e332c48a1b6cd2f5d6 100644
--- a/drivers/net/wireless/ath/ath12k/mac.c
+++ b/drivers/net/wireless/ath/ath12k/mac.c
@@ -4022,13 +4022,6 @@ static struct ath12k_link_vif *ath12k_mac_assign_link_vif(struct ath12k_hw *ah,
 		       sizeof(arvif->bitrate_mask.control[i].vht_mcs));
 	}
 
-	/* Allocate Default Queue now and reassign during actual vdev create */
-	vif->cab_queue = ATH12K_HW_DEFAULT_QUEUE;
-	for (i = 0; i < ARRAY_SIZE(vif->hw_queue); i++)
-		vif->hw_queue[i] = ATH12K_HW_DEFAULT_QUEUE;
-
-	vif->driver_flags |= IEEE80211_VIF_SUPPORTS_UAPSD;
-
 	rcu_assign_pointer(ahvif->link[arvif->link_id], arvif);
 	ahvif->links_map |= BIT(link_id);
 	synchronize_rcu();

-- 
2.34.1

[PATCH v2 4/8] wifi: ath12k: remove redundant logic for initializing arvif

[Aditya Kumar Singh]

The current logic for initializing arvif is present in both the add
interface operation callback and ath12k_mac_assign_link_vif(). The former
handles deflink initialization, while the latter is responsible for other
links. This redundancy could be avoided by using a common helper function.

Hence, add a new helper ath12k_mac_init_arvif() which initializes a
given arvif.

Since synchronizing rcu is not required after adding a rcu pointer, remove
that now.

Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.3.1-00173-QCAHKSWPL_SILICONZ-1

Reviewed-by: Vasanthakumar Thiagarajan <vasanthakumar.thiagarajan@oss.qualcomm.com>
Signed-off-by: Aditya Kumar Singh <aditya.kumar.singh@oss.qualcomm.com>
---
 drivers/net/wireless/ath/ath12k/mac.c | 80 +++++++++++++++++++++--------------
 1 file changed, 49 insertions(+), 31 deletions(-)

diff --git a/drivers/net/wireless/ath/ath12k/mac.c b/drivers/net/wireless/ath/ath12k/mac.c
index 7defc2b20fb61dcaec06d0e332c48a1b6cd2f5d6..5f0388002e16c38a834d6c7c6c020b7afa7044f0 100644
--- a/drivers/net/wireless/ath/ath12k/mac.c
+++ b/drivers/net/wireless/ath/ath12k/mac.c
@@ -3973,13 +3973,59 @@ static void ath12k_mac_op_link_info_changed(struct ieee80211_hw *hw,
 	ath12k_mac_bss_info_changed(ar, arvif, info, changed);
 }
 
+static void ath12k_mac_init_arvif(struct ath12k_vif *ahvif,
+				  struct ath12k_link_vif *arvif, int link_id)
+{
+	struct ath12k_hw *ah = ahvif->ah;
+	u8 _link_id;
+	int i;
+
+	lockdep_assert_wiphy(ah->hw->wiphy);
+
+	if (WARN_ON(!arvif))
+		return;
+
+	if (WARN_ON(link_id >= ATH12K_NUM_MAX_LINKS))
+		return;
+
+	if (link_id < 0)
+		_link_id = 0;
+	else
+		_link_id = link_id;
+
+	arvif->ahvif = ahvif;
+	arvif->link_id = _link_id;
+
+	INIT_LIST_HEAD(&arvif->list);
+	INIT_DELAYED_WORK(&arvif->connection_loss_work,
+			  ath12k_mac_vif_sta_connection_loss_work);
+
+	for (i = 0; i < ARRAY_SIZE(arvif->bitrate_mask.control); i++) {
+		arvif->bitrate_mask.control[i].legacy = 0xffffffff;
+		memset(arvif->bitrate_mask.control[i].ht_mcs, 0xff,
+		       sizeof(arvif->bitrate_mask.control[i].ht_mcs));
+		memset(arvif->bitrate_mask.control[i].vht_mcs, 0xff,
+		       sizeof(arvif->bitrate_mask.control[i].vht_mcs));
+	}
+
+	/* Handle MLO related assignments */
+	if (link_id >= 0) {
+		rcu_assign_pointer(ahvif->link[arvif->link_id], arvif);
+		ahvif->links_map |= BIT(_link_id);
+	}
+
+	ath12k_generic_dbg(ATH12K_DBG_MAC,
+			   "mac init link arvif (link_id %d%s) for vif %pM. links_map 0x%x",
+			   _link_id, (link_id < 0) ? " deflink" : "", ahvif->vif->addr,
+			   ahvif->links_map);
+}
+
 static struct ath12k_link_vif *ath12k_mac_assign_link_vif(struct ath12k_hw *ah,
 							  struct ieee80211_vif *vif,
 							  u8 link_id)
 {
 	struct ath12k_vif *ahvif = ath12k_vif_to_ahvif(vif);
 	struct ath12k_link_vif *arvif;
-	int i;
 
 	lockdep_assert_wiphy(ah->hw->wiphy);
 
@@ -4006,25 +4052,8 @@ static struct ath12k_link_vif *ath12k_mac_assign_link_vif(struct ath12k_hw *ah,
 		}
 	}
 
-	arvif->ahvif = ahvif;
-	arvif->link_id = link_id;
-	ahvif->links_map |= BIT(link_id);
-
-	INIT_LIST_HEAD(&arvif->list);
-	INIT_DELAYED_WORK(&arvif->connection_loss_work,
-			  ath12k_mac_vif_sta_connection_loss_work);
-
-	for (i = 0; i < ARRAY_SIZE(arvif->bitrate_mask.control); i++) {
-		arvif->bitrate_mask.control[i].legacy = 0xffffffff;
-		memset(arvif->bitrate_mask.control[i].ht_mcs, 0xff,
-		       sizeof(arvif->bitrate_mask.control[i].ht_mcs));
-		memset(arvif->bitrate_mask.control[i].vht_mcs, 0xff,
-		       sizeof(arvif->bitrate_mask.control[i].vht_mcs));
-	}
+	ath12k_mac_init_arvif(ahvif, arvif, link_id);
 
-	rcu_assign_pointer(ahvif->link[arvif->link_id], arvif);
-	ahvif->links_map |= BIT(link_id);
-	synchronize_rcu();
 	return arvif;
 }
 
@@ -8312,19 +8341,8 @@ static int ath12k_mac_op_add_interface(struct ieee80211_hw *hw,
 	ahvif->ah = ah;
 	ahvif->vif = vif;
 	arvif = &ahvif->deflink;
-	arvif->ahvif = ahvif;
-
-	INIT_LIST_HEAD(&arvif->list);
-	INIT_DELAYED_WORK(&arvif->connection_loss_work,
-			  ath12k_mac_vif_sta_connection_loss_work);
 
-	for (i = 0; i < ARRAY_SIZE(arvif->bitrate_mask.control); i++) {
-		arvif->bitrate_mask.control[i].legacy = 0xffffffff;
-		memset(arvif->bitrate_mask.control[i].ht_mcs, 0xff,
-		       sizeof(arvif->bitrate_mask.control[i].ht_mcs));
-		memset(arvif->bitrate_mask.control[i].vht_mcs, 0xff,
-		       sizeof(arvif->bitrate_mask.control[i].vht_mcs));
-	}
+	ath12k_mac_init_arvif(ahvif, arvif, -1);
 
 	/* Allocate Default Queue now and reassign during actual vdev create */
 	vif->cab_queue = ATH12K_HW_DEFAULT_QUEUE;

-- 
2.34.1

[PATCH v2 5/8] wifi: ath12k: use arvif instead of link_conf in ath12k_mac_set_key()

[Aditya Kumar Singh]

Currently, in ath12k_mac_set_key(), if sta is not present, the address is
retrieved from link_conf's bssid or addr member, depending on the interface
type.

When operating as an ML station and during shutdown, link_conf will not be
available. This can result in the following error:

ath12k_pci 0004:01:00.0: unable to access bss link conf in set key for vif AA:BB:CC:DD:EE:FF link 1

The primary purpose of accessing link_conf is to obtain the address for
finding the peer. However, since arvif is always valid in this call, it can
be used instead.

Add change to use arvif instead of link_conf.

A subsequent change will expose this issue but since tear down will give
error, this is included first.

Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.3.1-00173-QCAHKSWPL_SILICONZ-1

Reviewed-by: Vasanthakumar Thiagarajan <vasanthakumar.thiagarajan@oss.qualcomm.com>
Signed-off-by: Aditya Kumar Singh <aditya.kumar.singh@oss.qualcomm.com>
---
 drivers/net/wireless/ath/ath12k/mac.c | 14 +-------------
 1 file changed, 1 insertion(+), 13 deletions(-)

diff --git a/drivers/net/wireless/ath/ath12k/mac.c b/drivers/net/wireless/ath/ath12k/mac.c
index 5f0388002e16c38a834d6c7c6c020b7afa7044f0..db866c1419a613103f119037b19e24b7edaa6c24 100644
--- a/drivers/net/wireless/ath/ath12k/mac.c
+++ b/drivers/net/wireless/ath/ath12k/mac.c
@@ -4667,9 +4667,6 @@ static int ath12k_mac_set_key(struct ath12k *ar, enum set_key_cmd cmd,
 			      struct ath12k_link_sta *arsta,
 			      struct ieee80211_key_conf *key)
 {
-	struct ath12k_vif *ahvif = arvif->ahvif;
-	struct ieee80211_vif *vif = ath12k_ahvif_to_vif(ahvif);
-	struct ieee80211_bss_conf *link_conf;
 	struct ieee80211_sta *sta = NULL;
 	struct ath12k_base *ab = ar->ab;
 	struct ath12k_peer *peer;
@@ -4686,19 +4683,10 @@ static int ath12k_mac_set_key(struct ath12k *ar, enum set_key_cmd cmd,
 	if (test_bit(ATH12K_FLAG_HW_CRYPTO_DISABLED, &ab->dev_flags))
 		return 1;
 
-	link_conf = ath12k_mac_get_link_bss_conf(arvif);
-	if (!link_conf) {
-		ath12k_warn(ab, "unable to access bss link conf in set key for vif %pM link %u\n",
-			    vif->addr, arvif->link_id);
-		return -ENOLINK;
-	}
-
 	if (sta)
 		peer_addr = arsta->addr;
-	else if (ahvif->vdev_type == WMI_VDEV_TYPE_STA)
-		peer_addr = link_conf->bssid;
 	else
-		peer_addr = link_conf->addr;
+		peer_addr = arvif->bssid;
 
 	key->hw_key_idx = key->keyidx;
 

-- 
2.34.1

[PATCH v2 6/8] wifi: ath12k: relocate a few functions in mac.c

[Aditya Kumar Singh]

An upcoming change will invoke ath12k_mac_init_arvif(),
ath12k_mac_assign_link_vif(), ath12k_mac_unassign_link_vif(), and
ath12k_mac_remove_link_interface() from a line located above their current
definition. Hence, relocate these functions to above so that these can be
invoked later on.

No functionality changes. Compile tested only.

Signed-off-by: Aditya Kumar Singh <aditya.kumar.singh@oss.qualcomm.com>
---
 drivers/net/wireless/ath/ath12k/mac.c | 250 +++++++++++++++++-----------------
 1 file changed, 125 insertions(+), 125 deletions(-)

diff --git a/drivers/net/wireless/ath/ath12k/mac.c b/drivers/net/wireless/ath/ath12k/mac.c
index db866c1419a613103f119037b19e24b7edaa6c24..4f5bda45387ee16e1ab7a3c15a72252933f29129 100644
--- a/drivers/net/wireless/ath/ath12k/mac.c
+++ b/drivers/net/wireless/ath/ath12k/mac.c
@@ -3469,6 +3469,131 @@ static void ath12k_recalculate_mgmt_rate(struct ath12k *ar,
 		ath12k_warn(ar->ab, "failed to set beacon tx rate %d\n", ret);
 }
 
+static void ath12k_mac_init_arvif(struct ath12k_vif *ahvif,
+				  struct ath12k_link_vif *arvif, int link_id)
+{
+	struct ath12k_hw *ah = ahvif->ah;
+	u8 _link_id;
+	int i;
+
+	lockdep_assert_wiphy(ah->hw->wiphy);
+
+	if (WARN_ON(!arvif))
+		return;
+
+	if (WARN_ON(link_id >= ATH12K_NUM_MAX_LINKS))
+		return;
+
+	if (link_id < 0)
+		_link_id = 0;
+	else
+		_link_id = link_id;
+
+	arvif->ahvif = ahvif;
+	arvif->link_id = _link_id;
+
+	INIT_LIST_HEAD(&arvif->list);
+	INIT_DELAYED_WORK(&arvif->connection_loss_work,
+			  ath12k_mac_vif_sta_connection_loss_work);
+
+	for (i = 0; i < ARRAY_SIZE(arvif->bitrate_mask.control); i++) {
+		arvif->bitrate_mask.control[i].legacy = 0xffffffff;
+		memset(arvif->bitrate_mask.control[i].ht_mcs, 0xff,
+		       sizeof(arvif->bitrate_mask.control[i].ht_mcs));
+		memset(arvif->bitrate_mask.control[i].vht_mcs, 0xff,
+		       sizeof(arvif->bitrate_mask.control[i].vht_mcs));
+	}
+
+	/* Handle MLO related assignments */
+	if (link_id >= 0) {
+		rcu_assign_pointer(ahvif->link[arvif->link_id], arvif);
+		ahvif->links_map |= BIT(_link_id);
+	}
+
+	ath12k_generic_dbg(ATH12K_DBG_MAC,
+			   "mac init link arvif (link_id %d%s) for vif %pM. links_map 0x%x",
+			   _link_id, (link_id < 0) ? " deflink" : "", ahvif->vif->addr,
+			   ahvif->links_map);
+}
+
+static void ath12k_mac_remove_link_interface(struct ieee80211_hw *hw,
+					     struct ath12k_link_vif *arvif)
+{
+	struct ath12k_vif *ahvif = arvif->ahvif;
+	struct ath12k_hw *ah = hw->priv;
+	struct ath12k *ar = arvif->ar;
+	int ret;
+
+	lockdep_assert_wiphy(ah->hw->wiphy);
+
+	cancel_delayed_work_sync(&arvif->connection_loss_work);
+
+	ath12k_dbg(ar->ab, ATH12K_DBG_MAC, "mac remove link interface (vdev %d link id %d)",
+		   arvif->vdev_id, arvif->link_id);
+
+	if (ahvif->vdev_type == WMI_VDEV_TYPE_AP) {
+		ret = ath12k_peer_delete(ar, arvif->vdev_id, arvif->bssid);
+		if (ret)
+			ath12k_warn(ar->ab, "failed to submit AP self-peer removal on vdev %d link id %d: %d",
+				    arvif->vdev_id, arvif->link_id, ret);
+	}
+	ath12k_mac_vdev_delete(ar, arvif);
+}
+
+static struct ath12k_link_vif *ath12k_mac_assign_link_vif(struct ath12k_hw *ah,
+							  struct ieee80211_vif *vif,
+							  u8 link_id)
+{
+	struct ath12k_vif *ahvif = ath12k_vif_to_ahvif(vif);
+	struct ath12k_link_vif *arvif;
+
+	lockdep_assert_wiphy(ah->hw->wiphy);
+
+	arvif = wiphy_dereference(ah->hw->wiphy, ahvif->link[link_id]);
+	if (arvif)
+		return arvif;
+
+	if (!vif->valid_links) {
+		/* Use deflink for Non-ML VIFs and mark the link id as 0
+		 */
+		link_id = 0;
+		arvif = &ahvif->deflink;
+	} else {
+		/* If this is the first link arvif being created for an ML VIF
+		 * use the preallocated deflink memory except for scan arvifs
+		 */
+		if (!ahvif->links_map && link_id != ATH12K_DEFAULT_SCAN_LINK) {
+			arvif = &ahvif->deflink;
+		} else {
+			arvif = (struct ath12k_link_vif *)
+			kzalloc(sizeof(struct ath12k_link_vif), GFP_KERNEL);
+			if (!arvif)
+				return NULL;
+		}
+	}
+
+	ath12k_mac_init_arvif(ahvif, arvif, link_id);
+
+	return arvif;
+}
+
+static void ath12k_mac_unassign_link_vif(struct ath12k_link_vif *arvif)
+{
+	struct ath12k_vif *ahvif = arvif->ahvif;
+	struct ath12k_hw *ah = ahvif->ah;
+
+	lockdep_assert_wiphy(ah->hw->wiphy);
+
+	rcu_assign_pointer(ahvif->link[arvif->link_id], NULL);
+	synchronize_rcu();
+	ahvif->links_map &= ~BIT(arvif->link_id);
+
+	if (arvif != &ahvif->deflink)
+		kfree(arvif);
+	else
+		memset(arvif, 0, sizeof(*arvif));
+}
+
 static int
 ath12k_mac_op_change_vif_links(struct ieee80211_hw *hw,
 			       struct ieee80211_vif *vif,
@@ -3973,131 +4098,6 @@ static void ath12k_mac_op_link_info_changed(struct ieee80211_hw *hw,
 	ath12k_mac_bss_info_changed(ar, arvif, info, changed);
 }
 
-static void ath12k_mac_init_arvif(struct ath12k_vif *ahvif,
-				  struct ath12k_link_vif *arvif, int link_id)
-{
-	struct ath12k_hw *ah = ahvif->ah;
-	u8 _link_id;
-	int i;
-
-	lockdep_assert_wiphy(ah->hw->wiphy);
-
-	if (WARN_ON(!arvif))
-		return;
-
-	if (WARN_ON(link_id >= ATH12K_NUM_MAX_LINKS))
-		return;
-
-	if (link_id < 0)
-		_link_id = 0;
-	else
-		_link_id = link_id;
-
-	arvif->ahvif = ahvif;
-	arvif->link_id = _link_id;
-
-	INIT_LIST_HEAD(&arvif->list);
-	INIT_DELAYED_WORK(&arvif->connection_loss_work,
-			  ath12k_mac_vif_sta_connection_loss_work);
-
-	for (i = 0; i < ARRAY_SIZE(arvif->bitrate_mask.control); i++) {
-		arvif->bitrate_mask.control[i].legacy = 0xffffffff;
-		memset(arvif->bitrate_mask.control[i].ht_mcs, 0xff,
-		       sizeof(arvif->bitrate_mask.control[i].ht_mcs));
-		memset(arvif->bitrate_mask.control[i].vht_mcs, 0xff,
-		       sizeof(arvif->bitrate_mask.control[i].vht_mcs));
-	}
-
-	/* Handle MLO related assignments */
-	if (link_id >= 0) {
-		rcu_assign_pointer(ahvif->link[arvif->link_id], arvif);
-		ahvif->links_map |= BIT(_link_id);
-	}
-
-	ath12k_generic_dbg(ATH12K_DBG_MAC,
-			   "mac init link arvif (link_id %d%s) for vif %pM. links_map 0x%x",
-			   _link_id, (link_id < 0) ? " deflink" : "", ahvif->vif->addr,
-			   ahvif->links_map);
-}
-
-static struct ath12k_link_vif *ath12k_mac_assign_link_vif(struct ath12k_hw *ah,
-							  struct ieee80211_vif *vif,
-							  u8 link_id)
-{
-	struct ath12k_vif *ahvif = ath12k_vif_to_ahvif(vif);
-	struct ath12k_link_vif *arvif;
-
-	lockdep_assert_wiphy(ah->hw->wiphy);
-
-	arvif = wiphy_dereference(ah->hw->wiphy, ahvif->link[link_id]);
-	if (arvif)
-		return arvif;
-
-	if (!vif->valid_links) {
-		/* Use deflink for Non-ML VIFs and mark the link id as 0
-		 */
-		link_id = 0;
-		arvif = &ahvif->deflink;
-	} else {
-		/* If this is the first link arvif being created for an ML VIF
-		 * use the preallocated deflink memory except for scan arvifs
-		 */
-		if (!ahvif->links_map && link_id != ATH12K_DEFAULT_SCAN_LINK) {
-			arvif = &ahvif->deflink;
-		} else {
-			arvif = (struct ath12k_link_vif *)
-			kzalloc(sizeof(struct ath12k_link_vif), GFP_KERNEL);
-			if (!arvif)
-				return NULL;
-		}
-	}
-
-	ath12k_mac_init_arvif(ahvif, arvif, link_id);
-
-	return arvif;
-}
-
-static void ath12k_mac_unassign_link_vif(struct ath12k_link_vif *arvif)
-{
-	struct ath12k_vif *ahvif = arvif->ahvif;
-	struct ath12k_hw *ah = ahvif->ah;
-
-	lockdep_assert_wiphy(ah->hw->wiphy);
-
-	rcu_assign_pointer(ahvif->link[arvif->link_id], NULL);
-	synchronize_rcu();
-	ahvif->links_map &= ~BIT(arvif->link_id);
-
-	if (arvif != &ahvif->deflink)
-		kfree(arvif);
-	else
-		memset(arvif, 0, sizeof(*arvif));
-}
-
-static void ath12k_mac_remove_link_interface(struct ieee80211_hw *hw,
-					     struct ath12k_link_vif *arvif)
-{
-	struct ath12k_vif *ahvif = arvif->ahvif;
-	struct ath12k_hw *ah = hw->priv;
-	struct ath12k *ar = arvif->ar;
-	int ret;
-
-	lockdep_assert_wiphy(ah->hw->wiphy);
-
-	cancel_delayed_work_sync(&arvif->connection_loss_work);
-
-	ath12k_dbg(ar->ab, ATH12K_DBG_MAC, "mac remove link interface (vdev %d link id %d)",
-		   arvif->vdev_id, arvif->link_id);
-
-	if (ahvif->vdev_type == WMI_VDEV_TYPE_AP) {
-		ret = ath12k_peer_delete(ar, arvif->vdev_id, arvif->bssid);
-		if (ret)
-			ath12k_warn(ar->ab, "failed to submit AP self-peer removal on vdev %d link id %d: %d",
-				    arvif->vdev_id, arvif->link_id, ret);
-	}
-	ath12k_mac_vdev_delete(ar, arvif);
-}
-
 static struct ath12k*
 ath12k_mac_select_scan_device(struct ieee80211_hw *hw,
 			      struct ieee80211_vif *vif,

-- 
2.34.1

Re: [PATCH v2 6/8] wifi: ath12k: relocate a few functions in mac.c

[Vasanthakumar Thiagarajan]

On 2/4/2025 10:35 PM, Aditya Kumar Singh wrote:
> An upcoming change will invoke ath12k_mac_init_arvif(),
> ath12k_mac_assign_link_vif(), ath12k_mac_unassign_link_vif(), and
> ath12k_mac_remove_link_interface() from a line located above their current
> definition. Hence, relocate these functions to above so that these can be
> invoked later on.
> 
> No functionality changes. Compile tested only.
> 
> Signed-off-by: Aditya Kumar Singh <aditya.kumar.singh@oss.qualcomm.com>

Reviewed-by: Vasanthakumar Thiagarajan <vasanthakumar.thiagarajan@oss.qualcomm.com>

[PATCH v2 7/8] wifi: ath12k: allocate new links in change_vif_links()

[Aditya Kumar Singh]

Currently, links in an interface are allocated during channel assignment
via assign_vif_chanctx(). Conversely, links are deleted during channel
unassignment via unassign_vif_chanctx(). However, deleting links during
channel unassignment does not comply with mac80211 link handling.
Therefore, this process should be managed within change_vif_links(). To
maintain symmetry, link addition should also be handled in
change_vif_links().

Hence, add changes to allocate link arvif in change_vif_links(). Creating
the link interface on firmware will still be done during channel
assignment.

And since link will be created but channel might not be assigned, there is
a need now to test is_created flag in ath12k_mac_mlo_get_vdev_args() before
accessing link_conf or else link bring up will fail.

A subsequent change will handle link removal part.

Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.3.1-00173-QCAHKSWPL_SILICONZ-1

Reviewed-by: Vasanthakumar Thiagarajan <vasanthakumar.thiagarajan@oss.qualcomm.com>
Signed-off-by: Aditya Kumar Singh <aditya.kumar.singh@oss.qualcomm.com>
---
 drivers/net/wireless/ath/ath12k/mac.c | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/drivers/net/wireless/ath/ath12k/mac.c b/drivers/net/wireless/ath/ath12k/mac.c
index 4f5bda45387ee16e1ab7a3c15a72252933f29129..9ac2f883cd5cc3ee5950fabdf6b89e5330171468 100644
--- a/drivers/net/wireless/ath/ath12k/mac.c
+++ b/drivers/net/wireless/ath/ath12k/mac.c
@@ -3600,6 +3600,31 @@ ath12k_mac_op_change_vif_links(struct ieee80211_hw *hw,
 			       u16 old_links, u16 new_links,
 			       struct ieee80211_bss_conf *ol[IEEE80211_MLD_MAX_NUM_LINKS])
 {
+	struct ath12k_vif *ahvif = ath12k_vif_to_ahvif(vif);
+	unsigned long to_add = ~old_links & new_links;
+	struct ath12k_hw *ah = ath12k_hw_to_ah(hw);
+	struct ath12k_link_vif *arvif;
+	u8 link_id;
+
+	lockdep_assert_wiphy(hw->wiphy);
+
+	ath12k_generic_dbg(ATH12K_DBG_MAC,
+			   "mac vif link changed for MLD %pM old_links 0x%x new_links 0x%x\n",
+			   vif->addr, old_links, new_links);
+
+	for_each_set_bit(link_id, &to_add, IEEE80211_MLD_MAX_NUM_LINKS) {
+		arvif = wiphy_dereference(hw->wiphy, ahvif->link[link_id]);
+		/* mac80211 wants to add link but driver already has the
+		 * link. This should not happen ideally.
+		 */
+		if (WARN_ON(arvif))
+			return -EINVAL;
+
+		arvif = ath12k_mac_assign_link_vif(ah, vif, link_id);
+		if (WARN_ON(!arvif))
+			return -EINVAL;
+	}
+
 	return 0;
 }
 
@@ -8765,6 +8790,9 @@ ath12k_mac_mlo_get_vdev_args(struct ath12k_link_vif *arvif,
 		if (arvif == arvif_p)
 			continue;
 
+		if (!arvif_p->is_created)
+			continue;
+
 		link_conf = wiphy_dereference(ahvif->ah->hw->wiphy,
 					      ahvif->vif->link_conf[arvif_p->link_id]);
 

-- 
2.34.1

[PATCH v2 8/8] wifi: ath12k: handle link removal in change_vif_links()

[Aditya Kumar Singh]

Currently, the link interface is deleted during channel unassignment, which
does not align with mac80211 link handling. Therefore, add changes to only
perform vdev stop during channel unassignment. The actual vdev deletion
will occur in change_vif_links().

Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.3.1-00173-QCAHKSWPL_SILICONZ-1

Signed-off-by: Aditya Kumar Singh <aditya.kumar.singh@oss.qualcomm.com>
---
 drivers/net/wireless/ath/ath12k/mac.c | 19 ++++++++++++++++---
 1 file changed, 16 insertions(+), 3 deletions(-)

diff --git a/drivers/net/wireless/ath/ath12k/mac.c b/drivers/net/wireless/ath/ath12k/mac.c
index 9ac2f883cd5cc3ee5950fabdf6b89e5330171468..682ea0fc9a857a97000f1e683eb145f36ef0dd17 100644
--- a/drivers/net/wireless/ath/ath12k/mac.c
+++ b/drivers/net/wireless/ath/ath12k/mac.c
@@ -3601,6 +3601,7 @@ ath12k_mac_op_change_vif_links(struct ieee80211_hw *hw,
 			       struct ieee80211_bss_conf *ol[IEEE80211_MLD_MAX_NUM_LINKS])
 {
 	struct ath12k_vif *ahvif = ath12k_vif_to_ahvif(vif);
+	unsigned long to_remove = old_links & ~new_links;
 	unsigned long to_add = ~old_links & new_links;
 	struct ath12k_hw *ah = ath12k_hw_to_ah(hw);
 	struct ath12k_link_vif *arvif;
@@ -3625,6 +3626,21 @@ ath12k_mac_op_change_vif_links(struct ieee80211_hw *hw,
 			return -EINVAL;
 	}
 
+	for_each_set_bit(link_id, &to_remove, IEEE80211_MLD_MAX_NUM_LINKS) {
+		arvif = wiphy_dereference(hw->wiphy, ahvif->link[link_id]);
+		if (WARN_ON(!arvif))
+			return -EINVAL;
+
+		if (!arvif->is_created)
+			continue;
+
+		if (WARN_ON(!arvif->ar))
+			return -EINVAL;
+
+		ath12k_mac_remove_link_interface(hw, arvif);
+		ath12k_mac_unassign_link_vif(arvif);
+	}
+
 	return 0;
 }
 
@@ -9438,9 +9454,6 @@ ath12k_mac_op_unassign_vif_chanctx(struct ieee80211_hw *hw,
 	if (ahvif->vdev_type != WMI_VDEV_TYPE_MONITOR &&
 	    ar->num_started_vdevs == 1 && ar->monitor_vdev_created)
 		ath12k_mac_monitor_stop(ar);
-
-	ath12k_mac_remove_link_interface(hw, arvif);
-	ath12k_mac_unassign_link_vif(arvif);
 }
 
 static int

-- 
2.34.1

Re: [PATCH v2 8/8] wifi: ath12k: handle link removal in change_vif_links()

[Vasanthakumar Thiagarajan]

On 2/4/2025 10:35 PM, Aditya Kumar Singh wrote:
> Currently, the link interface is deleted during channel unassignment, which
> does not align with mac80211 link handling. Therefore, add changes to only
> perform vdev stop during channel unassignment. The actual vdev deletion
> will occur in change_vif_links().
> 
> Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.3.1-00173-QCAHKSWPL_SILICONZ-1
> 
> Signed-off-by: Aditya Kumar Singh <aditya.kumar.singh@oss.qualcomm.com>


Reviewed-by: Vasanthakumar Thiagarajan <vasanthakumar.thiagarajan@oss.qualcomm.com>

Re: [PATCH v2 0/8] wifi: ath12k: handle change_vif_links() callback

[Nicolas Escande]

On Tue Feb 4, 2025 at 6:05 PM CET, Aditya Kumar Singh wrote:
> Currently, links in an interface are allocated during channel assignment
> via assign_vif_chanctx(). Conversely, links are deleted during channel
> unassignment via unassign_vif_chanctx(). However, deleting links during
> channel unassignment does not comply with mac80211 link handling.
> Therefore, this process should be managed within change_vif_links().
>
> This series aims to add support to handle links in change_vif_links()
> callback.
>
> Patches 1-2 are making debug infra to work without device info.
>
> Patches 3-8 are the ones changing the code to handle as mentioned above.
>
> NOTE:
> * A new ath12k-check warning comes which probably needs to be added to
> ignore list
>
> drivers/net/wireless/ath/ath12k/debug.c:69: Prefer [subsystem eg: netdev]_dbg([subsystem]dev, ... then dev_dbg(dev, ... then pr_debug(...  to printk(KERN_DEBUG ...
>
> This is because, since device info is not known can not use netdev_ or dev_
> dbg family. pr_debug() is an option but that will require DYNAMIC_DEBUG
> and then ath12k needs to be probed with dyndbg=+p which we don't want in
> ath. Hence, only option left is to use printk() directly.
>
The issue seems to be resolved. Thanks a lot !

Tested-by: Nicolas Escande <nico.escande@gmail.com>
Tested-on: WLAN.WBE.1.3.1-00130-QCAHKSWPL_SILICONZ-1.97421.5

Re: [PATCH v2 0/8] wifi: ath12k: handle change_vif_links() callback

[Jeff Johnson]

On 2/4/2025 9:05 AM, Aditya Kumar Singh wrote:
> Currently, links in an interface are allocated during channel assignment
> via assign_vif_chanctx(). Conversely, links are deleted during channel
> unassignment via unassign_vif_chanctx(). However, deleting links during
> channel unassignment does not comply with mac80211 link handling.
> Therefore, this process should be managed within change_vif_links().
> 
> This series aims to add support to handle links in change_vif_links()
> callback.
> 
> Patches 1-2 are making debug infra to work without device info.
> 
> Patches 3-8 are the ones changing the code to handle as mentioned above.
> 
> NOTE:
> * A new ath12k-check warning comes which probably needs to be added to
> ignore list
> 
> drivers/net/wireless/ath/ath12k/debug.c:69: Prefer [subsystem eg: netdev]_dbg([subsystem]dev, ... then dev_dbg(dev, ... then pr_debug(...  to printk(KERN_DEBUG ...
> 
> This is because, since device info is not known can not use netdev_ or dev_
> dbg family. pr_debug() is an option but that will require DYNAMIC_DEBUG
> and then ath12k needs to be probed with dyndbg=+p which we don't want in
> ath. Hence, only option left is to use printk() directly.

A new version of ath12k-check has been pushed to
https://github.com/qca/qca-swiss-army-knife

Please update

Re: [PATCH v2 0/8] wifi: ath12k: handle change_vif_links() callback

[Jeff Johnson]

On Tue, 04 Feb 2025 22:35:06 +0530, Aditya Kumar Singh wrote:
> Currently, links in an interface are allocated during channel assignment
> via assign_vif_chanctx(). Conversely, links are deleted during channel
> unassignment via unassign_vif_chanctx(). However, deleting links during
> channel unassignment does not comply with mac80211 link handling.
> Therefore, this process should be managed within change_vif_links().
> 
> This series aims to add support to handle links in change_vif_links()
> callback.
> 
> [...]

Applied, thanks!

[1/8] wifi: ath12k: eliminate redundant debug mask check in ath12k_dbg()
      commit: cc5faf08aa3afc6f60d7df1a0edf041c4384fc95
[2/8] wifi: ath12k: introduce ath12k_generic_dbg()
      commit: 80f816d07ba0cf80a9b6aa90a30af2b2073c6cb7
[3/8] wifi: ath12k: remove redundant vif settings during link interface creation
      commit: ab6270c4dec3b1a506291c3b0050230b32464781
[4/8] wifi: ath12k: remove redundant logic for initializing arvif
      commit: 8acc7ec53ac43aea8f49573b5a173570f308b775
[5/8] wifi: ath12k: use arvif instead of link_conf in ath12k_mac_set_key()
      commit: 00e4dc11695d48322780812b503314682659e98b
[6/8] wifi: ath12k: relocate a few functions in mac.c
      commit: b81c39d67fbfcaccb33a1fc5494a87b29f2724ab
[7/8] wifi: ath12k: allocate new links in change_vif_links()
      commit: 315d80be304ac1d47da38c2b0c85286c9220c23a
[8/8] wifi: ath12k: handle link removal in change_vif_links()
      commit: 81e4be30544ee7e8da80e9aae7acd69d3be6d05a

Best regards,
-- 
Jeff Johnson <jeff.johnson@oss.qualcomm.com>