linux-kernel - Re: [PATCH 3/5] PCI: add set_max_vfs in pci

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Message-ID: <506C8A35.8010100@redhat.com>
Date:	Wed, 03 Oct 2012 14:55:49 -0400
From:	Don Dutile <ddutile@...hat.com>
To:	Yinghai Lu <yinghai@...nel.org>
CC:	Bjorn Helgaas <bhelgaas@...gle.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	yuvalmin@...adcom.com, bhutchings@...arflare.com,
	gregory.v.rose@...el.com, davem@...emloft.net--no-chain-reply-to
Subject: Re: [PATCH 3/5] PCI: add set_max_vfs in pci_driver ops

On 10/03/2012 01:51 PM, Yinghai Lu wrote:
> Will use it enable sriov for pci devices.
>
> Signed-off-by: Yinghai Lu<yinghai@...nel.org>
> ---
>   include/linux/pci.h |    1 +
>   1 files changed, 1 insertions(+), 0 deletions(-)
>
> diff --git a/include/linux/pci.h b/include/linux/pci.h
> index be1de01..7d70a5e 100644
> --- a/include/linux/pci.h
> +++ b/include/linux/pci.h
> @@ -590,6 +590,7 @@ struct pci_driver {
>   	const struct pci_device_id *id_table;	/* must be non-NULL for probe to be called */
>   	int  (*probe)  (struct pci_dev *dev, const struct pci_device_id *id);	/* New device inserted */
>   	void (*remove) (struct pci_dev *dev);	/* Device removed (NULL if not a hot-plug capable driver) */
> +	void (*set_max_vfs) (struct pci_dev *dev); /* enable sriov */
>   	int  (*suspend) (struct pci_dev *dev, pm_message_t state);	/* Device suspended */
>   	int  (*suspend_late) (struct pci_dev *dev, pm_message_t state);
>   	int  (*resume_early) (struct pci_dev *dev);

I thought I stated the following in your earlier patch set....

(a) don't use 'set_max_vfs' ;  it is not changing the max; the max
     is whatever the device supports. This kind of terminology confuses
     what is being done, and not descripting what is being done.
(b) this is equiv to the sriov_enable_vfs in the RFC set I sent.
     -- in this set, it prevents the user trying to do more than one enable,
        and that check should be done, and reject the request, which solves one
        of the complaints Alexander had.

I'll try to mind-meld your sysfs attr creation patches to mind later today
and post a new series tonight or tomorrow.  Sorry, stuck in mtgs today (and right now!),
thus the delay.

- Don

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