linux-kernel - Re: [PATCH v5 3/4] uio_pci_generic: add MSI/MSI-X support

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Date:	Tue, 6 Oct 2015 22:36:32 +0100
From:	Stephen Hemminger <stephen@...workplumber.org>
To:	Vlad Zolotarov <vladz@...udius-systems.com>
Cc:	linux-kernel@...r.kernel.org, mst@...hat.com, hjk@...sjkoch.de,
	corbet@....net, gregkh@...uxfoundation.org,
	bruce.richardson@...el.com, avi@...udius-systems.com,
	gleb@...udius-systems.com, alexander.duyck@...il.com
Subject: Re: [PATCH v5 3/4] uio_pci_generic: add MSI/MSI-X support

On Tue,  6 Oct 2015 20:17:38 +0300
Vlad Zolotarov <vladz@...udius-systems.com> wrote:

> +	int i, vectors = pci_msix_vec_count(pdev);
> +
> +	if (vectors <= 0)
> +		return false;
> +

Since devices like fm10k can thousands of MSI vectors, and often systems
have limited number of slots, some resource control is needed.
I limited the number in my version. That was one of the reasons for the late
binding of MSI vectors. Intended to allow application to ask for how
many it wanted.
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