Index: head/sys/dev/bnxt/bnxt.h
===================================================================
--- head/sys/dev/bnxt/bnxt.h
+++ head/sys/dev/bnxt/bnxt.h
@@ -87,6 +87,11 @@
 #define NETXTREME_E_VF2	0x16d3
 #define NETXTREME_E_VF3	0x16dc
 
+/* Maximum numbers of RX and TX descriptors. iflib requires this to be a power
+ * of two. The hardware has no particular limitation. */
+#define BNXT_MAX_RXD	((INT32_MAX >> 1) + 1)
+#define BNXT_MAX_TXD	((INT32_MAX >> 1) + 1)
+
 #define CSUM_OFFLOAD		(CSUM_IP_TSO|CSUM_IP6_TSO|CSUM_IP| \
 				 CSUM_IP_UDP|CSUM_IP_TCP|CSUM_IP_SCTP| \
 				 CSUM_IP6_UDP|CSUM_IP6_TCP|CSUM_IP6_SCTP)
Index: head/sys/dev/bnxt/if_bnxt.c
===================================================================
--- head/sys/dev/bnxt/if_bnxt.c
+++ head/sys/dev/bnxt/if_bnxt.c
@@ -316,11 +316,11 @@
 	.isc_nrxd_default = {PAGE_SIZE / sizeof(struct cmpl_base) * 8,
 	    PAGE_SIZE / sizeof(struct rx_prod_pkt_bd),
 	    PAGE_SIZE / sizeof(struct rx_prod_pkt_bd)},
-	.isc_nrxd_max = {INT32_MAX, INT32_MAX, INT32_MAX},
+	.isc_nrxd_max = {BNXT_MAX_RXD, BNXT_MAX_RXD, BNXT_MAX_RXD},
 	.isc_ntxd_min = {16, 16, 16},
 	.isc_ntxd_default = {PAGE_SIZE / sizeof(struct cmpl_base) * 2,
 	    PAGE_SIZE / sizeof(struct tx_bd_short)},
-	.isc_ntxd_max = {INT32_MAX, INT32_MAX, INT32_MAX},
+	.isc_ntxd_max = {BNXT_MAX_TXD, BNXT_MAX_TXD, BNXT_MAX_TXD},
 
 	.isc_admin_intrcnt = 1,
 	.isc_vendor_info = bnxt_vendor_info_array,