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nvethernet: set affinity for common irq

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Issue: when Softirq, vm and common interrupt
are scheduled on CPU0, due to priority inversion
of software IRQ, scheduling ISR corresponding to
HW interrupt got delayed.

Fix: set common IRQ affinity to other CPU core.

Bug 200780703

Change-Id: I56903de12fc753ac0075ace75ed72d34eac95c5d
Signed-off-by: Rakesh Goyal <rgoyal@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvidia/+/2610987
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
This commit is contained in:
Rakesh Goyal
2021-10-12 14:47:52 +05:30
committed by Revanth Kumar Uppala
parent 5f3e27f093
commit 594032b82a
2 changed files with 31 additions and 0 deletions
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22
drivers/net/ethernet/nvidia/nvethernet/ether_linux.c
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@@ -1267,6 +1267,10 @@ static void ether_free_irqs(struct ether_priv_data *pdata)
unsigned int chan;
if (pdata->common_irq_alloc_mask & 1U) {
if ((pdata->osi_core->mac == OSI_MAC_HW_MGBE) &&
(pdata->osi_core->use_virtualization == OSI_DISABLE)) {
irq_set_affinity_hint(pdata->common_irq, NULL);
}
devm_free_irq(pdata->dev, pdata->common_irq, pdata);
pdata->common_irq_alloc_mask = 0U;
}
@@ -1461,8 +1465,18 @@ static int ether_request_irqs(struct ether_priv_data *pdata)
pdata->common_irq);
return ret;
}
pdata->common_irq_alloc_mask = 1;
if ((osi_core->mac == OSI_MAC_HW_MGBE) &&
(cpu_online(pdata->common_isr_cpu_id)) &&
(osi_core->use_virtualization == OSI_DISABLE)) {
cpumask_set_cpu(pdata->common_isr_cpu_id,
&pdata->common_isr_cpu_mask);
irq_set_affinity_hint(pdata->common_irq,
&pdata->common_isr_cpu_mask);
}
if (osi_core->mac_ver > OSI_EQOS_MAC_5_00 ||
osi_core->mac == OSI_MAC_HW_MGBE) {
for (i = 0; i < osi_core->num_vm_irqs; i++) {
@@ -5350,6 +5364,14 @@ static int ether_parse_dt(struct ether_priv_data *pdata)
dev_info(dev, "setting default promiscuous mode supported\n");
pdata->promisc_mode = OSI_ENABLE;
}
ret = of_property_read_u32(np, "nvidia,common_irq-cpu-id",
&pdata->common_isr_cpu_id);
if (ret < 0) {
pdata->common_isr_cpu_id = ETHER_COMMON_IRQ_DEFAULT_CPU;
ret = 0;
}
/* any other invalid promiscuous mode DT value */
if (pdata->promisc_mode != OSI_DISABLE &&
pdata->promisc_mode != OSI_ENABLE){