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ionic: improve irq numa locality

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[ Upstream commit b7f55b81f2ac40e52c5a56e22c80488eac531c91 ]

Spreading the interrupts across the CPU cores is good for load
balancing, but not necessarily as good when using a CPU/core
that is not part of the NUMA local CPU.  If it can be localized,
the kernel's cpumask_local_spread() service will pick a core
that is on the node close to the PCI device.

Signed-off-by: Shannon Nelson <snelson@pensando.io>
Signed-off-by: David S. Miller <davem@davemloft.net>
Stable-dep-of: abfb2a58a537 ("ionic: remove WARN_ON to prevent panic_on_warn")
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Shannon Nelson 2020-03-06 17:04:03 -08:00 • committed by Greg Kroah-Hartman
commit ef7fc26b6a
1 changed files with 3 additions and 2 deletions
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5
drivers/net/ethernet/pensando/ionic/ionic_lif.c
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@ -418,8 +418,9 @@ static int ionic_qcq_alloc(struct ionic_lif *lif, unsigned int type,
ionic_intr_mask_assert(idev->intr_ctrl, new->intr.index,
IONIC_INTR_MASK_SET);
new->intr.cpu = new->intr.index % num_online_cpus();
if (cpu_online(new->intr.cpu))
new->intr.cpu = cpumask_local_spread(new->intr.index,
dev_to_node(dev));
if (new->intr.cpu != -1)
cpumask_set_cpu(new->intr.cpu,
&new->intr.affinity_mask);
} else {