Subject: [PATCH net-next 4/4] sfc: set and clear interrupt affinity hints

From: Shradha Shah <[email-masked]>
Date: Wed, 28 Oct 2015 15:02:03 +0000

From: Bert Kenward <[email-masked]>

Use cpumask_local_spread to provide interrupt affinity hints
for each queue. This will spread interrupts across NUMA local
CPUs first, extending to remote nodes if needed.

Signed-off-by: Shradha Shah <[email-masked]>
---
 drivers/net/ethernet/sfc/efx.c | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)

diff --git a/drivers/net/ethernet/sfc/efx.c b/drivers/net/ethernet/sfc/efx.c
index 84f9e90..93c4c0e 100644
--- a/drivers/net/ethernet/sfc/efx.c
+++ b/drivers/net/ethernet/sfc/efx.c
@@ -1489,6 +1489,30 @@ static int efx_probe_interrupts(struct efx_nic *efx)
 	return 0;
 }
 
+#if defined(CONFIG_SMP)
+static void efx_set_interrupt_affinity(struct efx_nic *efx)
+{
+	struct efx_channel *channel;
+	unsigned int cpu;
+
+	efx_for_each_channel(channel, efx) {
+		cpu = cpumask_local_spread(channel->channel,
+					   pcibus_to_node(efx->pci_dev->bus));
+
+		irq_set_affinity_hint(channel->irq, cpumask_of(cpu));
+		channel->irq_mem_node = cpu_to_mem(cpu);
+	}
+}
+
+static void efx_clear_interrupt_affinity(struct efx_nic *efx)
+{
+	struct efx_channel *channel;
+
+	efx_for_each_channel(channel, efx)
+		irq_set_affinity_hint(channel->irq, NULL);
+}
+#endif /* CONFIG_SMP */
+
 static int efx_soft_enable_interrupts(struct efx_nic *efx)
 {
 	struct efx_channel *channel, *end_channel;
@@ -2932,6 +2956,9 @@ static void efx_pci_remove_main(struct efx_nic *efx)
 	cancel_work_sync(&efx->reset_work);
 
 	efx_disable_interrupts(efx);
+#if defined(CONFIG_SMP)
+	efx_clear_interrupt_affinity(efx);
+#endif
 	efx_nic_fini_interrupt(efx);
 	efx_fini_port(efx);
 	efx->type->fini(efx);
@@ -3081,6 +3108,11 @@ static int efx_pci_probe_main(struct efx_nic *efx)
 	rc = efx_nic_init_interrupt(efx);
 	if (rc)
 		goto fail5;
+
+#if defined(CONFIG_SMP)
+	efx_set_interrupt_affinity(efx);
+#endif
+
 	rc = efx_enable_interrupts(efx);
 	if (rc)
 		goto fail6;
@@ -3088,6 +3120,9 @@ static int efx_pci_probe_main(struct efx_nic *efx)
 	return 0;
 
  fail6:
+#if defined(CONFIG_SMP)
+	efx_clear_interrupt_affinity(efx);
+#endif
 	efx_nic_fini_interrupt(efx);
  fail5:
 	efx_fini_port(efx);