[PATCH v8 2/3] wifi: ath11k: remove skb parameter from get_ring_selector

[Jose Ignacio Tornos Martinez]

Change the get_ring_selector hw_ops callback signature from
get_ring_selector(struct sk_buff *skb) to get_ring_selector(u8 ac),
removing the dependency on the skb.

After the previous patch switched WCN6750 from skb_get_hash() to
skb_get_queue_mapping(), all get_ring_selector implementations fall
into two categories:
 - smp_processor_id(): ignores the skb entirely
 - skb_get_queue_mapping(): only reads the AC value from the skb

Since the AC is the only information extracted from the skb, pass it
directly as a u8 parameter instead. Callers in the dp_tx path now
pass skb_get_queue_mapping(skb), which preserves the exact same
behavior.

This change enables a subsequent patch to call get_ring_selector()
from wake_tx_queue using txq->ac, without needing access to the skb.
mac80211 guarantees that skb_get_queue_mapping(skb) == txq->ac
for any skb dequeued from a given txq, since both values are
derived from the same skb->priority through the same AC mapping.

No functional change.

Tested-on: WCN6855 hw2.0 PCI WLAN.HSP.1.1-03125-QCAHSPSWPL_V1_V2_SILICONZ_LITE-3.6510.41

Signed-off-by: Jose Ignacio Tornos Martinez <jtornosm at redhat.com>
Tested-by: Julius Bairaktaris <julius at bairaktaris.de> # IPQ8074 WLAN.HK.2.9.0.1-02146
---
v8: Split ath11k and ath12k into separate series to avoid conflict
    with Julius's airtime queue limits series (ath11k only) and help to
    unblock both
    No code changes from v7
v7: https://lore.kernel.org/all/20260917064825.12747-3-jtornosm@redhat.com/

 drivers/net/wireless/ath/ath11k/dp_tx.c |  2 +-
 drivers/net/wireless/ath/ath11k/hw.c    | 16 ++++------------
 drivers/net/wireless/ath/ath11k/hw.h    |  2 +-
 3 files changed, 6 insertions(+), 14 deletions(-)

diff --git a/drivers/net/wireless/ath/ath11k/dp_tx.c b/drivers/net/wireless/ath/ath11k/dp_tx.c
index cac970c92806..083aca8ff355 100644
--- a/drivers/net/wireless/ath/ath11k/dp_tx.c
+++ b/drivers/net/wireless/ath/ath11k/dp_tx.c
@@ -108,7 +108,7 @@ int ath11k_dp_tx(struct ath11k *ar, struct ath11k_vif *arvif,

 	pool_id = skb_get_queue_mapping(skb) & (ATH11K_HW_MAX_QUEUES - 1);

-	ring_selector = ab->hw_params.hw_ops->get_ring_selector(skb);
+	ring_selector = ab->hw_params.hw_ops->get_ring_selector(skb_get_queue_mapping(skb));

 tcl_ring_sel:
 	tcl_ring_retry = false;
diff --git a/drivers/net/wireless/ath/ath11k/hw.c b/drivers/net/wireless/ath/ath11k/hw.c
index d679e39dce03..8a28c1d4c17b 100644
--- a/drivers/net/wireless/ath/ath11k/hw.c
+++ b/drivers/net/wireless/ath/ath11k/hw.c
@@ -876,22 +876,14 @@ static bool ath11k_hw_wcn6855_rx_desc_get_ldpc_support(struct hal_rx_desc *desc)
 			 __le32_to_cpu(desc->u.wcn6855.msdu_start.info2));
 }

-static u32 ath11k_hw_ipq8074_get_tcl_ring_selector(struct sk_buff *skb)
-{
-	/* Let the default ring selection be based on current processor
-	 * number, where one of the 3 tcl rings are selected based on
-	 * the smp_processor_id(). In case that ring
-	 * is full/busy, we resort to other available rings.
-	 * If all rings are full, we drop the packet.
-	 *
-	 * TODO: Add throttling logic when all rings are full
-	 */
+static u32 ath11k_hw_ipq8074_get_tcl_ring_selector(u8 ac)
+{
 	return smp_processor_id();
 }

-static u32 ath11k_hw_wcn6750_get_tcl_ring_selector(struct sk_buff *skb)
+static u32 ath11k_hw_wcn6750_get_tcl_ring_selector(u8 ac)
 {
-	return skb_get_queue_mapping(skb);
+	return ac;
 }

 const struct ath11k_hw_ops ipq8074_ops = {
diff --git a/drivers/net/wireless/ath/ath11k/hw.h b/drivers/net/wireless/ath/ath11k/hw.h
index 4996536fbd14..b6bc8b72d812 100644
--- a/drivers/net/wireless/ath/ath11k/hw.h
+++ b/drivers/net/wireless/ath/ath11k/hw.h
@@ -273,7 +273,7 @@ struct ath11k_hw_ops {
 	u16 (*mpdu_info_get_peerid)(struct hal_rx_mpdu_info *mpdu_info);
 	bool (*rx_desc_mac_addr2_valid)(struct hal_rx_desc *desc);
 	u8* (*rx_desc_mpdu_start_addr2)(struct hal_rx_desc *desc);
-	u32 (*get_ring_selector)(struct sk_buff *skb);
+	u32 (*get_ring_selector)(u8 ac);
 };

 extern const struct ath11k_hw_ops ipq8074_ops;
--
2.54.0