linux-kernel - Re: Add a helper function in PCI IOV to get VF device

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Date:	Wed, 2 Jun 2010 14:02:50 +0800
From:	Frank Pan <frankpzh@...il.com>
To:	Greg KH <greg@...ah.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>,
	Yu Zhao <yu.zhao@...el.com>,
	Chris Wright <chrisw@...s-sol.org>,
	Mitch Williams <mitch.a.williams@...el.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	"David S. Miller" <davem@...emloft.net>,
	Matt Carlson <mcarlson@...adcom.com>,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: Add a helper function in PCI IOV to get VF device

> What is "VF" and "PF" here?
Virtual function/Physical function

> No, the network core should create that symlink, not the driver, right?
They are not network interfaces, so network core
won't link them. They are for VM uses. I may need
to explain this more clearly.

PF's interface in sysfs is /sys/class/net/ethx, while
VF has no interface. So 82576 driver makes directories
to provide interface-like sysfs entries: /sys/class/net/ethx/vf[1-7]
Make a link to this directory form VF's pci device is
almost impossible, because PF doesn't know VF's bdf.

Thanks for reply.

-- 
Frank Pan

Computer Science and Technology
Tsinghua University
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