vhost/net: force len for TX to host endian (bf995734) · Commits · 戴 / test

vhost/net keeps a copy of the used ring in host memory but (ab)uses the length field for internal house-keeping. This works because the length in the used ring for tx is always 0. In order to suppress sparse warnings, we force native endianness here. Note that these values are never exposed to guests. Signed-off-by:

Michael S. Tsirkin <mst@redhat.com> Reviewed-by:

Jason Wang <jasowang@redhat.com>

drivers/vhost/net.c

+5 −5

Original line number	Diff line number	Diff line
		@@ -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 \|

Admin message