[PATCH] net/mlx5: Use cpumask_local_spread() instead of custom code

Erwan Velu
2024-08-12T08:23:15Z

Commit 2acda57736de ("net/mlx5e: Improve remote NUMA preferences used for the IRQ affinity hints")
removed the usage of cpumask_local_spread().

The issue explained in this commit was fixed by
commit 406d394abfcd ("cpumask: improve on cpumask_local_spread() locality").

Since this commit, mlx5_cpumask_default_spread() is having the same
behavior as cpumask_local_spread().

This commit is about :
- removing the specific logic and use cpumask_local_spread() instead
- passing mlx5_core_dev as argument to more flexibility

mlx5_cpumask_default_spread() is kept as it could be useful for some
future specific quirks.

Signed-off-by: Erwan Velu <e.velu@criteo.com>
---
drivers/net/ethernet/mellanox/mlx5/core/eq.c | 27 +++-----------------
1 file changed, 4 insertions(+), 23 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/eq.c b/drivers/net/ethernet/mellanox/mlx5/core/eq.c
index cb7e7e4104af..f15ecaef1331 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/eq.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/eq.c
@@ -835,28 +835,9 @@ static void comp_irq_release_pci(struct mlx5_core_dev *dev, u16 vecidx)
mlx5_irq_release_vector(irq);
}

-static int mlx5_cpumask_default_spread(int numa_node, int index)
+static int mlx5_cpumask_default_spread(struct mlx5_core_dev *dev, int index)
{
- const struct cpumask *prev = cpu_none_mask;
- const struct cpumask *mask;
- int found_cpu = 0;
- int i = 0;
- int cpu;
-
- rcu_read_lock();
- for_each_numa_hop_mask(mask, numa_node) {
- for_each_cpu_andnot(cpu, mask, prev) {
- if (i++ == index) {
- found_cpu = cpu;
- goto spread_done;
- }
- }
- prev = mask;
- }
-
-spread_done:
- rcu_read_unlock();
- return found_cpu;
+ return cpumask_local_spread(index, dev->priv.numa_node);
}

static struct cpu_rmap *mlx5_eq_table_get_pci_rmap(struct mlx5_core_dev *dev)
@@ -880,7 +861,7 @@ static int comp_irq_request_pci(struct mlx5_core_dev *dev, u16 vecidx)
int cpu;

rmap = mlx5_eq_table_get_pci_rmap(dev);
- cpu = mlx5_cpumask_default_spread(dev->priv.numa_node, vecidx);
+ cpu = mlx5_cpumask_default_spread(dev, vecidx);
irq = mlx5_irq_request_vector(dev, cpu, vecidx, &rmap);
if (IS_ERR(irq))
return PTR_ERR(irq);
@@ -1145,7 +1126,7 @@ int mlx5_comp_vector_get_cpu(struct mlx5_core_dev *dev, int vector)
if (mask)
cpu = cpumask_first(mask);
else
- cpu = mlx5_cpumask_default_spread(dev->priv.numa_node, vector);
+ cpu = mlx5_cpumask_default_spread(dev, vector);

return cpu;
}
--
2.46.0