linux-kernel - Re: [PATCH 1/2 v3] ixgbe: define IXGBE_MAX_VFS_DRV

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Message-ID: <309B89C4C689E141A5FF6A0C5FB2118B7312DE7D@ORSMSX101.amr.corp.intel.com>
Date:	Thu, 16 Jan 2014 01:54:26 +0000
From:	"Brown, Aaron F" <aaron.f.brown@...el.com>
To:	"ethan.kernel@...il.com" <ethan.kernel@...il.com>
CC:	"Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>,
	"Brandeburg, Jesse" <jesse.brandeburg@...el.com>,
	"Allan, Bruce W" <bruce.w.allan@...el.com>,
	"Wyborny, Carolyn" <carolyn.wyborny@...el.com>,
	"davem@...emloft.net" <davem@...emloft.net>,
	"e1000-devel@...ts.sourceforge.net" 
	<e1000-devel@...ts.sourceforge.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2 v3] ixgbe: define IXGBE_MAX_VFS_DRV_LIMIT macro and
 cleanup const 63

On Thu, 2014-01-16 at 09:27 +0800, Ethan Zhao wrote:
> On Thu, Jan 16, 2014 at 6:00 AM, Brown, Aaron F <aaron.f.brown@...el.com> wrote:
> > On Wed, 2014-01-15 at 22:12 +0800, Ethan Zhao wrote:
> >> Because ixgbe driver limit the max number of VF functions could be enabled
> >> to 63, so define one macro IXGBE_MAX_VFS_DRV_LIMIT and cleanup the const 63
> >> in code.
> >>
> >> v2: fix a typo.
> >> v3: fix a encoding issue.
> >>
> >> Signed-off-by: Ethan Zhao <ethan.kernel@...il.com>
> >> ---
> >>  drivers/net/ethernet/intel/ixgbe/ixgbe_main.c  | 4 ++--
> >>  drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c | 5 +++--
> >>  drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.h | 5 +++++
> >>  3 files changed, 10 insertions(+), 4 deletions(-)
> >>
> >> diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
> >> index 0ade0cd..47e9b44 100644
> >> --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
> >> +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
> >> @@ -4818,7 +4818,7 @@ static int ixgbe_sw_init(struct ixgbe_adapter *adapter)
> >>  #ifdef CONFIG_PCI_IOV
> >>       /* assign number of SR-IOV VFs */
> >>       if (hw->mac.type != ixgbe_mac_82598EB)
> >> -             adapter->num_vfs = (max_vfs > 63) ? 0 : max_vfs;
> >
> >
> > Unfortunately the if statement got changed considerably with a recent
> > commit:
> >
> > commit 170e85430bcbe4d18e81b5a70bb163c741381092
> > ixgbe: add warning when max_vfs is out of range.
> >
> > And the pattern no longer exists to make a match.  In other words, this
> > patch no longer applies to net-next and I have to ask you for yet
> > another spin if you still want to squash the magic number.
> 
> It's not a good news. Our distro is waiting for this patch showing up in stable.
> OK, info me if there is a windows for me to revise the patch.

I don't think any particular window of time is better than another. I
don't see this change as needing very thorough testing so if you send in
(yet) another version I'll try to get it through our internal process as
rapidly as I can.

> 
> Thanks,
> Ethan
> 
> >
> > Thanks,
> > Aaron