netdev - Re: [PATCH net-next V0 19/21] mlx4_core: Modify driver initialization flow to accommodate SRIOV for Ethernet

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Message-Id: <201112050919.39280.jackm@dev.mellanox.co.il>
Date:	Mon, 5 Dec 2011 09:19:38 +0200
From:	Jack Morgenstein <jackm@....mellanox.co.il>
To:	Or Gerlitz <ogerlitz@...lanox.com>
Cc:	Roland Dreier <roland@...estorage.com>,
	Yevgeny Petrilin <yevgenyp@...lanox.co.il>,
	davem@...emloft.net, netdev@...r.kernel.org,
	linux-rdma@...r.kernel.org, liranl@...lanox.co.il
Subject: Re: [PATCH net-next V0 19/21] mlx4_core: Modify driver initialization flow to accommodate SRIOV for Ethernet

On Sunday 04 December 2011 17:39, Or Gerlitz wrote:
> On 12/4/2011 4:29 PM, Jack Morgenstein wrote:
> > If the kernel is not configured to support IOV, pci_enable_sriov will 
> > fail.
> Jack,
> 
> If CONFIG_PCI_IOV isn't set, pci_enable_sriov isn't there...
> 
> Or.
> 
Not so.  I checked. If CONFIG_PCI_IOV isn't set, pci_enable_sriov returns -ENODEV
via a static inline function.
Look in kernel file include/linux/pci.h (for the most recent kernel):
 
#ifdef CONFIG_PCI_IOV
extern int pci_enable_sriov(struct pci_dev *dev, int nr_virtfn);
extern void pci_disable_sriov(struct pci_dev *dev);
extern irqreturn_t pci_sriov_migration(struct pci_dev *dev);
extern int pci_num_vf(struct pci_dev *dev);
#else
static inline int pci_enable_sriov(struct pci_dev *dev, int nr_virtfn)
{
        return -ENODEV;
}
static inline void pci_disable_sriov(struct pci_dev *dev)
{
}
static inline irqreturn_t pci_sriov_migration(struct pci_dev *dev)
{
        return IRQ_NONE;
}
static inline int pci_num_vf(struct pci_dev *dev)
{
        return 0;
}
#endif

- Jack
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