netdev - [RFC PATCH 1/2] net: add ndo_fcoe_ddp_target() to support FCoE DDP in target mode

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Message-ID: <20110126180901.25039.18150.stgit@localhost.localdomain>
Date:	Wed, 26 Jan 2011 10:09:01 -0800
From:	Kiran Patil <kiran.patil@...el.com>
To:	netdev@...r.kernel.org, jeffrey.t.kirsher@...el.com,
	yi.zou@...el.com, robert.w.love@...el.com, kiran.patil@...el.com
Subject: [RFC PATCH 1/2] net: add ndo_fcoe_ddp_target() to support FCoE DDP in
	target mode

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>
---

 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 d8fd2c2..d96a198 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -774,6 +774,10 @@ 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);
 #define NETDEV_FCOE_WWNN 0
 #define NETDEV_FCOE_WWPN 1
 	int			(*ndo_fcoe_get_wwn)(struct net_device *dev,

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