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Subject[PATCH net-next V3 3/3] enic: Use NUMA distances logic when setting affinity hints
Date
Use the new CPU spread API to sort cpus preference of remote NUMA nodes
according to their distance.

Cc: Christian Benvenuti <benve@cisco.com>
Cc: Govindarajulu Varadarajan <_govind@gmx.com>
Reviewed-by: Gal Pressman <gal@nvidia.com>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
---
drivers/net/ethernet/cisco/enic/enic_main.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/cisco/enic/enic_main.c b/drivers/net/ethernet/cisco/enic/enic_main.c
index 372fb7b3a282..9de3c3ffa1e3 100644
--- a/drivers/net/ethernet/cisco/enic/enic_main.c
+++ b/drivers/net/ethernet/cisco/enic/enic_main.c
@@ -44,6 +44,7 @@
#include <linux/cpu_rmap.h>
#endif
#include <linux/crash_dump.h>
+#include <linux/sched/topology.h>
#include <net/busy_poll.h>
#include <net/vxlan.h>

@@ -114,8 +115,14 @@ static struct enic_intr_mod_range mod_range[ENIC_MAX_LINK_SPEEDS] = {
static void enic_init_affinity_hint(struct enic *enic)
{
int numa_node = dev_to_node(&enic->pdev->dev);
+ u16 *cpus;
int i;

+ cpus = kcalloc(enic->intr_count, sizeof(*cpus), GFP_KERNEL);
+ if (!cpus)
+ return;
+
+ sched_cpus_set_spread(numa_node, cpus, enic->intr_count);
for (i = 0; i < enic->intr_count; i++) {
if (enic_is_err_intr(enic, i) || enic_is_notify_intr(enic, i) ||
(cpumask_available(enic->msix[i].affinity_mask) &&
@@ -123,9 +130,10 @@ static void enic_init_affinity_hint(struct enic *enic)
continue;
if (zalloc_cpumask_var(&enic->msix[i].affinity_mask,
GFP_KERNEL))
- cpumask_set_cpu(cpumask_local_spread(i, numa_node),
+ cpumask_set_cpu(cpus[i],
enic->msix[i].affinity_mask);
}
+ kfree(cpus);
}

static void enic_free_affinity_hint(struct enic *enic)
--
2.21.0
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