linux-kernel - [PATCH v3 03/14] i40e: Use irq_update_affinity

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Message-Id: <20210713211502.464259-4-nitesh@redhat.com>
Date:   Tue, 13 Jul 2021 17:14:51 -0400
From:   Nitesh Narayan Lal <nitesh@...hat.com>
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        intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org,
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Subject: [PATCH v3 03/14] i40e: Use irq_update_affinity_hint

The driver uses irq_set_affinity_hint() for two purposes:

- To set the affinity_hint which is consumed by the userspace for
  distributing the interrupts

- To apply an affinity that it provides for the i40e interrupts

The latter is done to ensure that all the interrupts are evenly spread
across all available CPUs. However, since commit a0c9259dc4e1 ("irq/matrix:
Spread interrupts on allocation") the spreading of interrupts is
dynamically performed at the time of allocation. Hence, there is no need
for the drivers to enforce their own affinity for the spreading of
interrupts.

Also, irq_set_affinity_hint() applying the provided cpumask as an affinity
for the interrupt is an undocumented side effect. To remove this side
effect irq_set_affinity_hint() has been marked as deprecated and new
interfaces have been introduced. Hence, replace the irq_set_affinity_hint()
with the new interface irq_update_affinity_hint() that only sets the
pointer for the affinity_hint.

Signed-off-by: Nitesh Narayan Lal <nitesh@...hat.com>
---
 drivers/net/ethernet/intel/i40e/i40e_main.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
index 861e59a350bd..e2c525a6cab3 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -3873,10 +3873,10 @@ static int i40e_vsi_request_irq_msix(struct i40e_vsi *vsi, char *basename)
 		 *
 		 * get_cpu_mask returns a static constant mask with
 		 * a permanent lifetime so it's ok to pass to
-		 * irq_set_affinity_hint without making a copy.
+		 * irq_update_affinity_hint without making a copy.
 		 */
 		cpu = cpumask_local_spread(q_vector->v_idx, -1);
-		irq_set_affinity_hint(irq_num, get_cpu_mask(cpu));
+		irq_update_affinity_hint(irq_num, get_cpu_mask(cpu));
 	}
 
 	vsi->irqs_ready = true;
@@ -3887,7 +3887,7 @@ static int i40e_vsi_request_irq_msix(struct i40e_vsi *vsi, char *basename)
 		vector--;
 		irq_num = pf->msix_entries[base + vector].vector;
 		irq_set_affinity_notifier(irq_num, NULL);
-		irq_set_affinity_hint(irq_num, NULL);
+		irq_update_affinity_hint(irq_num, NULL);
 		free_irq(irq_num, &vsi->q_vectors[vector]);
 	}
 	return err;
@@ -4695,7 +4695,7 @@ static void i40e_vsi_free_irq(struct i40e_vsi *vsi)
 			/* clear the affinity notifier in the IRQ descriptor */
 			irq_set_affinity_notifier(irq_num, NULL);
 			/* remove our suggested affinity mask for this IRQ */
-			irq_set_affinity_hint(irq_num, NULL);
+			irq_update_affinity_hint(irq_num, NULL);
 			synchronize_irq(irq_num);
 			free_irq(irq_num, vsi->q_vectors[i]);
 
-- 
2.27.0