netdev - RE: [net-next-2.6 04/14] net: add ndo_fcoe_ddp_target() to support FCoE DDP in target mode

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Date:	Mon, 7 Mar 2011 18:54:10 -0800
From:	"Zou, Yi" <yi.zou@...el.com>
To:	Ben Hutchings <bhutchings@...arflare.com>,
	"Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>
CC:	"davem@...emloft.net" <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"gospo@...hat.com" <gospo@...hat.com>,
	"bphilips@...ell.com" <bphilips@...ell.com>,
	"Patil, Kiran" <kiran.patil@...el.com>
Subject: RE: [net-next-2.6 04/14] net: add ndo_fcoe_ddp_target() to support
 FCoE DDP in target mode

> On Mon, 2011-03-07 at 18:24 -0800, Jeff Kirsher wrote:
> > From: Yi Zou <yi.zou@...el.com>
> >
> > The Fiber Channel over Ethernet (FCoE) Direct Data Placement (DDP) can
> also be
> > used for FCoE target, where the DDP used for read I/O on an initiator
> can be
> > used on an FCoE target to speed up the write I/O to the target from the
> initiator.
> > The added ndo_fcoe_ddp_target() works in the similar way as the
> existing
> > ndo_fcoe_ddp_setup() to allow the underlying hardware set up the DDP
> context
> > accordingly when it gets called from the FCoE target implementation on
> top
> > the existing Open-FCoE fcoe/libfc protocol stack so without losing the
> ability
> > to provide DDP for read I/O as an initiator, it can also provide DDP
> offload
> > to the write I/O coming from the initiator as a target.
> >
> > Signed-off-by: Yi Zou <yi.zou@...el.com>
> > Signed-off-by: Kiran Patil <kiran.patil@...el.com>
> > Tested-by: Kavindya Deegala <kavindya.s.deegala@...el.com>
> > Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
> > ---
> >  include/linux/netdevice.h |    4 ++++
> >  1 files changed, 4 insertions(+), 0 deletions(-)
> >
> > diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
> > index 71563e7..6bd5d46 100644
> > --- a/include/linux/netdevice.h
> > +++ b/include/linux/netdevice.h
> > @@ -871,6 +871,10 @@ struct net_device_ops {
> >  						      unsigned int sgc);
> >  	int			(*ndo_fcoe_ddp_done)(struct net_device *dev,
> >  						     u16 xid);
> > +	int			(*ndo_fcoe_ddp_target)(struct net_device *dev,
> > +						       u16 xid,
> > +						       struct scatterlist *sgl,
> > +						       unsigned int sgc);
> 
> This should be described in the comment heading net_device_ops.
> (Really, all the existing FCoE operations ought to have been described
> as well.)
> 
> Ben.
Yes, you are right, it should be. Will it be ok if I send a separate 
patch as follow-up to properly add all comments?

yi

> 
> >  #define NETDEV_FCOE_WWNN 0
> >  #define NETDEV_FCOE_WWPN 1
> >  	int			(*ndo_fcoe_get_wwn)(struct net_device *dev,
> 
> --
> Ben Hutchings, Senior Software Engineer, Solarflare Communications
> Not speaking for my employer; that's the marketing department's job.
> They asked us to note that Solarflare product names are trademarked.