From mboxrd@z Thu Jan  1 00:00:00 1970
From: Markus Theil <markus.theil@tu-ilmenau.de>
Subject: Re: [PATCH v4 3/3] igb_uio: MSI IRQ mode
Date: Fri, 1 Sep 2017 00:07:06 +0200
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To: Stephen Hemminger <stephen@networkplumber.org>
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On 31.08.2017 17:32, Stephen Hemminger wrote:
> On Thu, 31 Aug 2017 12:22:29 +0200
> Markus Theil <markus.theil@tu-ilmenau.de> wrote:
>
>> +/*
>> + * It masks the msi on/off of generating MSI messages.
>> + */
>> +static void
>> +igbuio_msi_mask_irq(struct pci_dev *pdev, struct msi_desc *desc, int32_t state)
>> +{
>> +	u32 mask_bits = desc->masked;
>> +	u32 offset = desc->irq - pdev->irq;
>> +	u32 mask = 1 << offset;
>> +	u32 flag = !!state << offset;
>> +
>> +	if (!desc->msi_attrib.maskbit)
>> +		return;
>> +
>> +	mask_bits &= ~mask;
>> +	mask_bits |= flag;
>> +
>> +	if (mask_bits != desc->masked) {
>> +		pci_write_config_dword(pdev, desc->mask_pos, mask_bits);
>> +		desc->masked = mask_bits;
>> +	}
>> +}
>> +
> Why not use the existing kernel API pci_msi_mask_irq()?
Thanks for the advice, I have considered it in v5.