netdev - [PATCH net-next 3/8] ionic: improve irq numa locality

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Date:   Mon,  2 Mar 2020 20:15:40 -0800
From:   Shannon Nelson <snelson@...sando.io>
To:     davem@...emloft.net, netdev@...r.kernel.org
Cc:     Shannon Nelson <snelson@...sando.io>
Subject: [PATCH net-next 3/8] ionic: improve irq numa locality

Spreading the interrupts across the CPU cores is good for load
balancing, but not necessarily as good when using a CPU/core
that is not part of the NUMA local CPU.  If it can be localized,
the kernel's cpumask_local_spread() service will pick a core
that is on the node close to the PCI device.

Signed-off-by: Shannon Nelson <snelson@...sando.io>
---
 drivers/net/ethernet/pensando/ionic/ionic_lif.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/pensando/ionic/ionic_lif.c b/drivers/net/ethernet/pensando/ionic/ionic_lif.c
index 1b7e18fe83db..7df49b433ae5 100644
--- a/drivers/net/ethernet/pensando/ionic/ionic_lif.c
+++ b/drivers/net/ethernet/pensando/ionic/ionic_lif.c
@@ -424,8 +424,9 @@ static int ionic_qcq_alloc(struct ionic_lif *lif, unsigned int type,
 		ionic_intr_mask_assert(idev->intr_ctrl, new->intr.index,
 				       IONIC_INTR_MASK_SET);
 
-		new->intr.cpu = new->intr.index % num_online_cpus();
-		if (cpu_online(new->intr.cpu))
+		new->intr.cpu = cpumask_local_spread(new->intr.index,
+						     dev_to_node(dev));
+		if (new->intr.cpu != -1)
 			cpumask_set_cpu(new->intr.cpu,
 					&new->intr.affinity_mask);
 	} else {
-- 
2.17.1