socsvn commit: r305589 - soc2016/vincenzo/head/sys/dev/netmap

[vincenzo at FreeBSD.org]

Author: vincenzo
Date: Mon Jun 27 12:49:12 2016
New Revision: 305589
URL: http://svnweb.FreeBSD.org/socsvn/?view=rev&rev=305589

Log:
   freebsd: ptnet_transmit: recheck ring->tail only when necessary

Modified:
  soc2016/vincenzo/head/sys/dev/netmap/if_ptnet.c

Modified: soc2016/vincenzo/head/sys/dev/netmap/if_ptnet.c
==============================================================================
--- soc2016/vincenzo/head/sys/dev/netmap/if_ptnet.c	Mon Jun 27 12:48:55 2016	(r305588)
+++ soc2016/vincenzo/head/sys/dev/netmap/if_ptnet.c	Mon Jun 27 12:49:12 2016	(r305589)
@@ -1231,12 +1231,12 @@
 			 * freed up some, by reading hwcur and hwtail from
 			 * the CSB. */
 			ptnet_sync_tail(ptring, kring);
-		}
 
-		if (head == ring->tail) {
-			/* Still no slots available, let's stop and wait
-			 * for interrupts. */
-			break;
+			if (head == ring->tail) {
+				/* Still no slots available, let's stop and
+				 * wait for interrupts. */
+				break;
+			}
 		}
 
 		m = drbr_peek(ifp, pq->bufring);