[NET PATCH 4/9] venet: report actual used descriptor size

Gregory Haskins
2009-10-14T16:10:34Z

This should reduce wasted effort copying parts of the descriptor
which are not in use, since the descriptors are typically pre-allocated
to their maximum size.

Signed-off-by: Gregory Haskins <ghaskins@novell.com>
---

drivers/net/vbus-enet.c | 2 ++
include/linux/venet.h | 3 +++
2 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/drivers/net/vbus-enet.c b/drivers/net/vbus-enet.c
index b3e9695..63237f3 100644
--- a/drivers/net/vbus-enet.c
+++ b/drivers/net/vbus-enet.c
@@ -582,6 +582,8 @@ vbus_enet_tx_start(struct sk_buff *skb, struct net_device *dev)
iov->ptr = (u64)sg_phys(sg);
}

+ iter.desc->len = (u64)VSG_DESC_SIZE(vsg->count);
+
} else {
/*
* non scatter-gather mode: simply put the skb right onto the
diff --git a/include/linux/venet.h b/include/linux/venet.h
index 57aeddd..53b6958 100644
--- a/include/linux/venet.h
+++ b/include/linux/venet.h
@@ -76,6 +76,9 @@ struct venet_sg {
struct venet_iov iov[1];
};

+#define VSG_DESC_SIZE(count) (sizeof(struct venet_sg) + \
+ sizeof(struct venet_iov) * ((count) - 1))
+
#define VENET_FUNC_LINKUP 0
#define VENET_FUNC_LINKDOWN 1
#define VENET_FUNC_MACQUERY 2