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-rw-r--r--sys/net/netmap_user.h7
1 files changed, 6 insertions, 1 deletions
diff --git a/sys/net/netmap_user.h b/sys/net/netmap_user.h
index be66e7a..4efdec3 100644
--- a/sys/net/netmap_user.h
+++ b/sys/net/netmap_user.h
@@ -77,11 +77,16 @@
#define NETMAP_BUF_IDX(ring, buf) \
( ((char *)(buf) - ((char *)(ring) + (ring)->buf_ofs) ) / \
- (ring)->nr_buf_size) )
+ (ring)->nr_buf_size )
#define NETMAP_RING_NEXT(r, i) \
((i)+1 == (r)->num_slots ? 0 : (i) + 1 )
+#define NETMAP_RING_FIRST_RESERVED(r) \
+ ( (r)->cur < (r)->reserved ? \
+ (r)->cur + (r)->num_slots - (r)->reserved : \
+ (r)->cur - (r)->reserved )
+
/*
* Return 1 if the given tx ring is empty.
*/
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