netdev - RE: [PATCH net-next 06/13] bnx2x: Control number of vfs dynamically

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Message-ID: <6AE768456CEC4B4A9B2248CB6B87EB3E1BD10E88@SJEXCHMB05.corp.ad.broadcom.com>
Date:	Tue, 12 Mar 2013 10:51:13 +0000
From:	"Ariel Elior" <ariele@...adcom.com>
To:	"David Miller" <davem@...emloft.net>,
	"Yuval Mintz" <yuvalmin@...adcom.com>
cc:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"Eilon Greenstein" <eilong@...adcom.com>
Subject: RE: [PATCH net-next 06/13] bnx2x: Control number of vfs
 dynamically

> -----Original Message-----
> From: David Miller [mailto:davem@...emloft.net]
> Sent: Tuesday, March 12, 2013 11:28 AM
> To: Yuval Mintz
> Cc: netdev@...r.kernel.org; Eilon Greenstein; Ariel Elior
> Subject: Re: [PATCH net-next 06/13] bnx2x: Control number of vfs
> dynamically
> 
> From: "Yuval Mintz" <yuvalmin@...adcom.com>
> Date: Mon, 11 Mar 2013 17:17:46 +0200
> 
> > From: Ariel Elior <ariele@...adcom.com>
> >
> > 1. Support sysfs interface for getting the maximal number of virtual
> functions
> >    of a given physical function.
> > 2. Support sysfs interface for getting and setting the current number of
> >    virtual functions.
> >
> > Signed-off-by: Ariel Elior <ariele@...adcom.com>
> > Signed-off-by: Yuval Mintz <yuvalmin@...adcom.com>
> > Signed-off-by: Eilon Greenstein <eilong@...adcom.com>
> 
> I don't like these sysfs knobs at all, what are other drivers
> doing?

Intel's ixgbe and igb already implement these callbacks.
Other drivers are using proprietary module parameters.
This is a generic sysfs interface which any driver can use.

Yuval Mintz from Broadcom started the
"New commands to configure IOV features" thread
http://marc.info/?l=linux-netdev&m=133638974914452&w=2
As the discussion developed it was realized that virtual functions
have a wider scope than networking.
The discussion culminated with a submission to the pci tree:
commit 1789382a72a537447d65ea4131d8bcc1ad85ce7b
Author: Donald Dutile <ddutile@...hat.com>
Date:   Mon Nov 5 15:20:36 2012 -0500

Adding sriov_numvfs and sriov_totalvfs to all SR-IOV capable pci devices.
I would like to add that sysfs is actually a very convenient place to have 
these knobs, because the virtfn entries there are a simple reliable way to
know which vf devices sprouted from which PF devices and what are their
names, which is very handy when scripting with VFs.

Thanks,
Ariel

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