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net: nvethernet: Prevent VM interrupts being balanced

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If the userspace service 'irqbalance' is installed then the nvethernet
driver crashes when there is network activity. To avoid this crash set
the IRQF_NOBALANCING flash for the VM interrupts. No performance
degradation is observed when running iperf3 with a 1Gbps link.

Long-term the nvethernet driver still needs to be fixed to allow IRQ
balancing.

Bug 4293378
Bug 4541158

Change-Id: I0aa4ee28e36c7d273f14ff043544e72d3e988bd3
Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/3087525
Reviewed-by: Brad Griffis <bgriffis@nvidia.com>
Reviewed-by: Revanth Kumar Uppala <ruppala@nvidia.com>
GVS: Gerrit_Virtual_Submit <buildbot_gerritrpt@nvidia.com>
This commit is contained in:
Jon Hunter
2024-03-01 13:35:18 +00:00
committed by mobile promotions
parent 4d4e685699
commit f9ed570c2b
1 changed files with 3 additions and 2 deletions
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5
drivers/net/ethernet/nvidia/nvethernet/ether_linux.c
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@@ -1,5 +1,5 @@
// SPDX-License-Identifier: GPL-2.0-only
// Copyright (c) 2019-2023 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
// SPDX-FileCopyrightText: Copyright (c) 2019-2024, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
#include <nvidia/conftest.h>
@@ -1650,7 +1650,8 @@ static int ether_request_irqs(struct ether_priv_data *pdata)
snprintf(pdata->irq_names[j], ETHER_IRQ_NAME_SZ, "%s.vm%d",
netdev_name(pdata->ndev), i);
ret = devm_request_irq(pdata->dev, pdata->vm_irqs[i],
ether_vm_isr, IRQF_TRIGGER_NONE,
ether_vm_isr,
IRQF_TRIGGER_NONE | IRQF_NOBALANCING,
pdata->irq_names[j++],
&pdata->vm_irq_data[i]);
if (unlikely(ret < 0)) {