linux-kernel - Re: [net-next PATCH 1/2] igbvf: add new driver to support 82576 virtual functions

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Date:	Tue, 17 Mar 2009 18:08:26 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Alexander Duyck <alexander.h.duyck@...el.com>
Cc:	"Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>,
	"davem@...emloft.net" <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"gospo@...hat.com" <gospo@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"greg@...ah.com" <greg@...ah.com>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	"Zhao, Yu" <yu.zhao@...el.com>
Subject: Re: [net-next PATCH 1/2] igbvf: add new driver to support 82576
 virtual functions

On Tue, 17 Mar 2009 17:12:48 -0700 Alexander Duyck <alexander.h.duyck@...el.com> wrote:

> Thanks for all the comments.  I tried to incorporate most of them into 
> the igbvf driver and also ended up porting some over to our other 
> drivers, specifically igb since the igbvf driver copies much of the code.
> 
> I have added my comments inline below.
> 
> Thanks,
> 
> Alex
> 
> Andrew Morton wrote:
> > On Tue, 10 Mar 2009 19:09:28 -0700 Jeff Kirsher <jeffrey.t.kirsher@...el.com> wrote:
> > 
> >> From: Alexander Duyck <alexander.h.duyck@...el.com>
> >>
> >> This adds an igbvf driver to handle virtual functions provided
> >> by the igb driver.
> > 
> > The drive-by reader is now wondering what a "virtual function" is.

^^ this comment was missed.

I was indirectly asking for an overview (preferably in the changelog) of
what the whole patch actually does.

> >>
> >> +static int igbvf_set_ringparam(struct net_device *netdev,
> >> +                               struct ethtool_ringparam *ring)
> >> +{
> >> +     struct igbvf_adapter *adapter = netdev_priv(netdev);
> >> +     struct igbvf_ring *tx_ring, *tx_old;
> >> +     struct igbvf_ring *rx_ring, *rx_old;
> >> +     int err;
> >> +
> >> +     if ((ring->rx_mini_pending) || (ring->rx_jumbo_pending))
> >> +             return -EINVAL;
> >> +
> >> +     while (test_and_set_bit(__IGBVF_RESETTING, &adapter->state))
> >> +             msleep(1);
> > 
> > No timeout needed here?  Interrupts might not be working, for example..
> 
> This bit isn't set in interrupt context.  This is always used out of 
> interrupt context and is just to prevent multiple setting changes at the 
> same time.

Oh.  Can't use plain old mutex_lock()?


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