netdev - [PATCH v7 30/46] vhost/net: force len for TX to host endian

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Date:	Sun, 30 Nov 2014 17:11:44 +0200
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	David Miller <davem@...emloft.net>, cornelia.huck@...ibm.com,
	rusty@....ibm.com, nab@...ux-iscsi.org, pbonzini@...hat.com,
	thuth@...ux.vnet.ibm.com, dahi@...ux.vnet.ibm.com,
	Jason Wang <jasowang@...hat.com>, kvm@...r.kernel.org,
	virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org
Subject: [PATCH v7 30/46] vhost/net: force len for TX to host endian

vhost/net keeps a copy of some used ring but (ab)uses length
field for internal house-keeping. This works because
for tx used length is always 0.
Suppress sparse errors: we use native endian-ness internally but never
expose it to guest.

Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
Reviewed-by: Jason Wang <jasowang@...hat.com>
---
 drivers/vhost/net.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c
index 8dae2f7..dce5c58 100644
--- a/drivers/vhost/net.c
+++ b/drivers/vhost/net.c
@@ -48,15 +48,15 @@ MODULE_PARM_DESC(experimental_zcopytx, "Enable Zero Copy TX;"
  * status internally; used for zerocopy tx only.
  */
 /* Lower device DMA failed */
-#define VHOST_DMA_FAILED_LEN	3
+#define VHOST_DMA_FAILED_LEN	((__force __virtio32)3)
 /* Lower device DMA done */
-#define VHOST_DMA_DONE_LEN	2
+#define VHOST_DMA_DONE_LEN	((__force __virtio32)2)
 /* Lower device DMA in progress */
-#define VHOST_DMA_IN_PROGRESS	1
+#define VHOST_DMA_IN_PROGRESS	((__force __virtio32)1)
 /* Buffer unused */
-#define VHOST_DMA_CLEAR_LEN	0
+#define VHOST_DMA_CLEAR_LEN	((__force __virtio32)0)
 
-#define VHOST_DMA_IS_DONE(len) ((len) >= VHOST_DMA_DONE_LEN)
+#define VHOST_DMA_IS_DONE(len) ((__force u32)(len) >= (__force u32)VHOST_DMA_DONE_LEN)
 
 enum {
 	VHOST_NET_FEATURES = VHOST_FEATURES |
-- 
MST

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