netdev - RE: [Pv-drivers] [PATCH 2.6.31-rc9] net: VMware virtual Ethernet NIC driver: vmxnet3

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Message-ID: <8B1F619C9F5F454E81D90D3C161698D7017DB76582@EXCH-MBX-3.vmware.com>
Date:	Tue, 29 Sep 2009 12:52:05 -0700
From:	Bhavesh Davda <bhavesh@...are.com>
To:	Arnd Bergmann <arnd@...db.de>, Chris Wright <chrisw@...s-sol.org>
CC:	"pv-drivers@...are.com" <pv-drivers@...are.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	virtualization <virtualization@...ts.linux-foundation.org>,
	Greg Kroah-Hartman <greg@...ah.com>,
	Anthony Liguori <anthony@...emonkey.ws>,
	Jeff Garzik <jgarzik@...ox.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Stephen Hemminger <shemminger@...ux-foundation.org>,
	"David S. Miller" <davem@...emloft.net>
Subject: RE: [Pv-drivers] [PATCH 2.6.31-rc9] net: VMware virtual Ethernet
	NIC driver: vmxnet3

Hi Arnd,

> On Tuesday 29 September 2009, Chris Wright wrote:
> > > +struct Vmxnet3_MiscConf {
> > > +       struct Vmxnet3_DriverInfo driverInfo;
> > > +       uint64_t             uptFeatures;
> > > +       uint64_t             ddPA;         /* driver data PA */
> > > +       uint64_t             queueDescPA;  /* queue descriptor
> table PA */
> > > +       uint32_t             ddLen;        /* driver data len */
> > > +       uint32_t             queueDescLen; /* queue desc. table len
> in bytes */
> > > +       uint32_t             mtu;
> > > +       uint16_t             maxNumRxSG;
> > > +       uint8_t              numTxQueues;
> > > +       uint8_t              numRxQueues;
> > > +       uint32_t             reserved[4];
> > > +};
> >
> > should this be packed (or others that are shared w/ device)?  i
> assume
> > you've already done 32 vs 64 here
> 
> I would not mark it packed, because it already is well-defined on all
> systems. You should add __packed only to the fields where you screwed
> up, but not to structures that already work fine.

You're exactly right; I reiterated as much in my response to Chris.

> One thing that should possibly be fixed is the naming of identifiers,
> e.g.
> 's/Vmxnet3_MiscConf/vmxnet3_misc_conf/g', unless these header files are
> shared with the host implementation.

These header files are indeed shared with the host implementation, as you've guessed. If it's not a big deal, we would like to keep the names the same, just for our own sanity's sake?

Thanks!

- Bhavesh

> 
> 	Arnd <><
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