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[RFC,v7,02/19] Add a new struct for device to manipulate external buffer.

Message ID 1275732899-5423-2-git-send-email-xiaohui.xin@intel.com
State RFC, archived
Delegated to: David Miller
Headers show

Commit Message

Xin, Xiaohui June 5, 2010, 10:14 a.m. UTC 
From: Xin Xiaohui <xiaohui.xin@intel.com>

Signed-off-by: Xin Xiaohui <xiaohui.xin@intel.com>
Signed-off-by: Zhao Yu <yzhao81new@gmail.com>
Reviewed-by: Jeff Dike <jdike@linux.intel.com>
---
 include/linux/netdevice.h |   19 ++++++++++++++++++-
 1 files changed, 18 insertions(+), 1 deletions(-)
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Patch

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index fa8b476..bae725c 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -530,6 +530,22 @@  struct netdev_queue {
 	unsigned long		tx_dropped;
 } ____cacheline_aligned_in_smp;
 
+/* Add a structure in structure net_device, the new field is
+ * named as mp_port. It's for mediate passthru (zero-copy).
+ * It contains the capability for the net device driver,
+ * a socket, and an external buffer creator, external means
+ * skb buffer belongs to the device may not be allocated from
+ * kernel space.
+ */
+struct mpassthru_port	{
+	int		hdr_len;
+	int		data_len;
+	int		npages;
+	unsigned	flags;
+	struct socket	*sock;
+	struct skb_external_page *(*ctor)(struct mpassthru_port *,
+				struct sk_buff *, int);
+};
 
 /*
  * This structure defines the management hooks for network devices.
@@ -952,7 +968,8 @@  struct net_device {
 	struct macvlan_port	*macvlan_port;
 	/* GARP */
 	struct garp_port	*garp_port;
-
+	/* mpassthru */
+	struct mpassthru_port	*mp_port;
 	/* class/net/name entry */
 	struct device		dev;
 	/* space for optional device, statistics, and wireless sysfs groups */