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    Subject[PATCH net-next V4 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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