Index: if_bnx.c
===================================================================
RCS file: /cvs/src/sys/dev/pci/if_bnx.c,v
retrieving revision 1.120
diff -u -p -r1.120 if_bnx.c
--- if_bnx.c	11 Dec 2015 16:07:01 -0000	1.120
+++ if_bnx.c	4 May 2016 10:59:17 -0000
@@ -4893,7 +4893,8 @@ bnx_start(struct ifnet *ifp)
 	 */
 	used = 0;
 	while (1) {
-		if (sc->used_tx_bd + used + BNX_MAX_SEGMENTS >= sc->max_tx_bd) {
+		if (sc->used_tx_bd + used + BNX_MAX_SEGMENTS + 1 >=
+		    sc->max_tx_bd) {
 			DBPRINT(sc, BNX_INFO_SEND, "TX chain is closed for "
 			    "business! Total tx_bd used = %d\n",
 			    sc->used_tx_bd + used);