Clarify comments about number of tx / rx rings

2 files changed, 4 insertions, 3 deletions

diff --git a/sys/dev/netmap/netmap.c b/sys/dev/netmap/netmap.c
index cbf6852..145fba1 100644
--- a/sys/dev/netmap/netmap.c
+++ b/sys/dev/netmap/netmap.c
@@ -1282,7 +1282,8 @@ netmap_lock_wrapper(struct ifnet *dev, int what, u_int queueid)
  * kring	N+1	is only used for the selinfo for all queues.
  * Return 0 on success, ENOMEM otherwise.
  *
- * na->num_tx_rings can be set for cards with different tx/rx setups
+ * By default the receive and transmit adapter ring counts are both initialized  * to num_queues.  na->num_tx_rings can be set for cards with different tx/rx
+ * setups.
  */
 int
 netmap_attach(struct netmap_adapter *na, int num_queues)
diff --git a/sys/dev/netmap/netmap_kern.h b/sys/dev/netmap/netmap_kern.h
index ebd4f71..ec87b1c 100644
--- a/sys/dev/netmap/netmap_kern.h
+++ b/sys/dev/netmap/netmap_kern.h
@@ -144,8 +144,8 @@ struct netmap_adapter {
 	int separate_locks; /* set if the interface suports different
 			       locks for rx, tx and core. */
 
-	u_int num_rx_rings; /* number of tx/rx ring pairs */
-	u_int num_tx_rings; // if nonzero, overrides num_rx_rings
+	u_int num_rx_rings; /* number of adapter receive rings */
+	u_int num_tx_rings; /* number of adapter transmit rings */
 
 	u_int num_tx_desc; /* number of descriptor in each queue */
 	u_int num_rx_desc;