From: Xin Xiaohui <xiaohui.xin@xxxxxxxxx>
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.
Signed-off-by: Xin Xiaohui <xiaohui.xin@xxxxxxxxx>
Signed-off-by: Zhao Yu <yzhao81new@xxxxxxxxx>
Reviewed-by: Jeff Dike <jdike@xxxxxxxxxxxxxxx>
---
include/linux/netdevice.h | 25 ++++++++++++++++++++++++-
1 files changed, 24 insertions(+), 1 deletions(-)
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index fa8b476..9ef9bf1 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -530,6 +530,28 @@ struct netdev_queue {
unsigned long tx_dropped;
} ____cacheline_aligned_in_smp;
+/*The structure for mediate passthru(zero-copy). */
+struct mp_port {
+ /* the header len */
+ int hdr_len;
+ /* the max payload len for one descriptor */
+ int data_len;
+ /* the pages for DMA in one time */
+ int npages;
+ /* the socket bind to */
+ struct socket *sock;
+ /* the header len for virtio-net */
+ int vnet_hlen;
+ /* the external buffer page creator */
+ struct skb_ext_page *(*ctor)(struct mp_port *,
+ struct sk_buff *, int);
+ /* the hash function attached to find according
+ * backend ring descriptor info for one external
+ * buffer page.
+ */
+ struct skb_ext_page *(*hash)(struct net_device *,
+ struct page *);
+};
/*
* This structure defines the management hooks for network devices.
@@ -952,7 +974,8 @@ struct net_device {
struct macvlan_port *macvlan_port;
/* GARP */
struct garp_port *garp_port;
-
+ /* mpassthru */
+ struct mp_port *mp_port;
/* class/net/name entry */
struct device dev;
/* space for optional device, statistics, and wireless sysfs groups */
--
1.7.3
--
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