vhost-net: cleanup macros for DMA status tracking

[~andy/linux] / drivers / vhost / vhost.h

diff --git a/drivers/vhost/vhost.h b/drivers/vhost/vhost.h
index 1125af3d27d12b3f724a79a259aa774e6d214b67..b6538eef746803558626cf1a986e27289770038c 100644 (file)
--- a/drivers/vhost/vhost.h
+++ b/drivers/vhost/vhost.h
@@ -13,9 +13,15 @@
 #include <linux/virtio_ring.h>
 #include <linux/atomic.h>
 
-/* This is for zerocopy, used buffer len is set to 1 when lower device DMA
- * done */
-#define VHOST_DMA_DONE_LEN     1
+/*
+ * For transmit, used buffer len is unused; we override it to track buffer
+ * status internally; used for zerocopy tx only.
+ */
+/* Lower device DMA done */
+#define VHOST_DMA_DONE_LEN     2
+/* Lower device DMA in progress */
+#define VHOST_DMA_IN_PROGRESS  1
+/* Buffer unused */
 #define VHOST_DMA_CLEAR_LEN    0
 
 struct vhost_device;
@@ -191,7 +197,7 @@ bool vhost_enable_notify(struct vhost_dev *, struct vhost_virtqueue *);
 
 int vhost_log_write(struct vhost_virtqueue *vq, struct vhost_log *log,
                    unsigned int log_num, u64 len);
-void vhost_zerocopy_callback(struct ubuf_info *);
+void vhost_zerocopy_callback(struct ubuf_info *, bool);
 int vhost_zerocopy_signal_used(struct vhost_virtqueue *vq);
 
 #define vq_err(vq, fmt, ...) do {                                  \