netdev - [PATCH net-next v3 1/1] ice: Change assigning method of the CPU affinity masks

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Date:   Fri, 17 Feb 2023 23:03:59 +0100
From:   Pawel Chmielewski <pawel.chmielewski@...el.com>
To:     netdev@...r.kernel.org
Cc:     intel-wired-lan@...osl.org,
        Pawel Chmielewski <pawel.chmielewski@...el.com>
Subject: [PATCH net-next v3 1/1] ice: Change assigning method of the CPU affinity masks

With the introduction of sched_numa_hop_mask() and for_each_numa_hop_mask(),
the affinity masks for queue vectors can be conveniently set by preferring the
CPUs that are closest to the NUMA node of the parent PCI device.

Signed-off-by: Pawel Chmielewski <pawel.chmielewski@...el.com>
---
Changes since v2:
 * Pointers for cpumasks point to const struct cpumask
 * Removed unnecessary label
 * Removed redundant blank lines

Changes since v1:
 * Removed obsolete comment
 * Inverted condition for loop escape
 * Incrementing v_idx only in case of available cpu
---
 drivers/net/ethernet/intel/ice/ice_base.c | 21 ++++++++++++++++-----
 1 file changed, 16 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/intel/ice/ice_base.c b/drivers/net/ethernet/intel/ice/ice_base.c
index 1911d644dfa8..30dc1c3c290f 100644
--- a/drivers/net/ethernet/intel/ice/ice_base.c
+++ b/drivers/net/ethernet/intel/ice/ice_base.c
@@ -121,9 +121,6 @@ static int ice_vsi_alloc_q_vector(struct ice_vsi *vsi, u16 v_idx)
 
 	if (vsi->type == ICE_VSI_VF)
 		goto out;
-	/* only set affinity_mask if the CPU is online */
-	if (cpu_online(v_idx))
-		cpumask_set_cpu(v_idx, &q_vector->affinity_mask);
 
 	/* This will not be called in the driver load path because the netdev
 	 * will not be created yet. All other cases with register the NAPI
@@ -662,8 +659,10 @@ int ice_vsi_wait_one_rx_ring(struct ice_vsi *vsi, bool ena, u16 rxq_idx)
  */
 int ice_vsi_alloc_q_vectors(struct ice_vsi *vsi)
 {
+	const struct cpumask *aff_mask, *last_aff_mask = cpu_none_mask;
 	struct device *dev = ice_pf_to_dev(vsi->back);
-	u16 v_idx;
+	int numa_node = dev->numa_node;
+	u16 v_idx, cpu = 0;
 	int err;
 
 	if (vsi->q_vectors[0]) {
@@ -677,7 +676,19 @@ int ice_vsi_alloc_q_vectors(struct ice_vsi *vsi)
 			goto err_out;
 	}
 
-	return 0;
+	v_idx = 0;
+	for_each_numa_hop_mask(aff_mask, numa_node) {
+		for_each_cpu_andnot(cpu, aff_mask, last_aff_mask) {
+			if (v_idx >= vsi->num_q_vectors)
+				return 0;
+
+			if (cpu_online(cpu)) {
+				cpumask_set_cpu(cpu, &vsi->q_vectors[v_idx]->affinity_mask);
+				v_idx++;
+			}
+		}
+		last_aff_mask = aff_mask;
+	}
 
 err_out:
 	while (v_idx--)
-- 
2.37.3