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

[Bert Kenward]

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: Bert Kenward <bkenw...@solarflare.com>
---
 drivers/net/ethernet/sfc/efx.c | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

diff --git a/drivers/net/ethernet/sfc/efx.c b/drivers/net/ethernet/sfc/efx.c
index 692dd729ee2a..c30b9e26f131 100644
--- a/drivers/net/ethernet/sfc/efx.c
+++ b/drivers/net/ethernet/sfc/efx.c
@@ -1551,6 +1551,38 @@ 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));
+       }
+}
+
+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);
+}
+#else
+static void
+efx_set_interrupt_affinity(struct efx_nic *efx __attribute__ ((unused)))
+{
+}
+
+static void
+efx_clear_interrupt_affinity(struct efx_nic *efx __attribute__ ((unused)))
+{
+}
+#endif /* CONFIG_SMP */
+
 static int efx_soft_enable_interrupts(struct efx_nic *efx)
 {
        struct efx_channel *channel, *end_channel;
@@ -3165,6 +3197,7 @@ static void efx_pci_remove_main(struct efx_nic *efx)
        cancel_work_sync(&efx->reset_work);
 
        efx_disable_interrupts(efx);
+       efx_clear_interrupt_affinity(efx);
        efx_nic_fini_interrupt(efx);
        efx_fini_port(efx);
        efx->type->fini(efx);
@@ -3314,6 +3347,8 @@ static int efx_pci_probe_main(struct efx_nic *efx)
        rc = efx_nic_init_interrupt(efx);
        if (rc)
                goto fail5;
+
+       efx_set_interrupt_affinity(efx);
        rc = efx_enable_interrupts(efx);
        if (rc)
                goto fail6;
@@ -3321,6 +3356,7 @@ static int efx_pci_probe_main(struct efx_nic *efx)
        return 0;
 
  fail6:
+       efx_clear_interrupt_affinity(efx);
        efx_nic_fini_interrupt(efx);
  fail5:
        efx_fini_port(efx);
-- 
2.13.6