[PATCH v5 2/2] wifi: ath12k: enable threaded NAPI when DP IRQ affinity is unavailable

[Hangtian Zhu]

From: Hangtian Zhu <hangtian.zhu at oss.qualcomm.com>

Determine threaded NAPI policy from runtime IRQ capability of the DP MSI
IRQ.

If irq_can_set_affinity() reports that affinity cannot be set, enable
threaded NAPI for DP interrupt groups so datapath processing is not
constrained by a single-CPU softirq context.

On RB3Gen2, where IRQ affinity is unavailable in the effective IRQ path,
EHT160 UDP downlink throughput improved from 802 Mbps to 2.58 Gbps after
enabling threaded NAPI.

Tested-on: QCC2072 hw1.0 PCI WLAN.COL.1.0.c2-00074-QCACOLSWPL_V1_TO_SILICONZ-1

Signed-off-by: Hangtian Zhu <hangtian.zhu at oss.qualcomm.com>
---
 drivers/net/wireless/ath/ath12k/pci.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/ath/ath12k/pci.c b/drivers/net/wireless/ath/ath12k/pci.c
index 375277ca2b89..065449806ea9 100644
--- a/drivers/net/wireless/ath/ath12k/pci.c
+++ b/drivers/net/wireless/ath/ath12k/pci.c
@@ -5,6 +5,7 @@
  */
 
 #include <linux/module.h>
+#include <linux/interrupt.h>
 #include <linux/msi.h>
 #include <linux/pci.h>
 #include <linux/time.h>
@@ -537,6 +538,8 @@ static int ath12k_pci_ext_irq_config(struct ath12k_base *ab)
 	int i, j, n, ret, num_vectors = 0;
 	u32 user_base_data = 0, base_vector = 0, base_idx;
 	struct ath12k_ext_irq_grp *irq_grp;
+	bool threaded_napi = false;
+	int irq;
 
 	base_idx = ATH12K_PCI_IRQ_CE0_OFFSET + CE_COUNT_MAX;
 	ret = ath12k_pci_get_user_msi_assignment(ab, "DP",
@@ -546,6 +549,10 @@ static int ath12k_pci_ext_irq_config(struct ath12k_base *ab)
 	if (ret < 0)
 		return ret;
 
+	irq = ath12k_pci_get_msi_irq(ab->dev, base_vector);
+	if (irq >= 0)
+		threaded_napi = !irq_can_set_affinity(irq);
+
 	for (i = 0; i < ATH12K_EXT_IRQ_GRP_NUM_MAX; i++) {
 		irq_grp = &ab->ext_irq_grp[i];
 		u32 num_irq = 0;
@@ -560,6 +567,8 @@ static int ath12k_pci_ext_irq_config(struct ath12k_base *ab)
 
 		netif_napi_add(irq_grp->napi_ndev, &irq_grp->napi,
 			       ath12k_pci_ext_grp_napi_poll);
+		if (threaded_napi)
+			netif_threaded_enable(irq_grp->napi_ndev);
 
 		if (ab->hw_params->ring_mask->tx[i] ||
 		    ab->hw_params->ring_mask->rx[i] ||
@@ -578,7 +587,7 @@ static int ath12k_pci_ext_irq_config(struct ath12k_base *ab)
 		for (j = 0; j < irq_grp->num_irq; j++) {
 			int irq_idx = irq_grp->irqs[j];
 			int vector = (i % num_vectors) + base_vector;
-			int irq = ath12k_pci_get_msi_irq(ab->dev, vector);
+			irq = ath12k_pci_get_msi_irq(ab->dev, vector);
 
 			ab->irq_num[irq_idx] = irq;
 
-- 
2.25.1