Always use the maximum permissible frame size for Rx size limit.

This lets a change of interface MTU take effect immediately without
link cycling and brings cnmac(4) into line with other jumbo frame
capable NIC drivers.

Prompted by Joe Holden on misc@
OK dlg@

diff --git a/sys/arch/octeon/dev/cn30xxgmx.c b/sys/arch/octeon/dev/cn30xxgmx.c
index af8dd1e..4dd98a8 100644 (file)
--- a/sys/arch/octeon/dev/cn30xxgmx.c
+++ b/sys/arch/octeon/dev/cn30xxgmx.c
@@ -1,4 +1,4 @@
-/*     $OpenBSD: cn30xxgmx.c,v 1.34 2017/05/02 13:26:49 visa Exp $     */
+/*     $OpenBSD: cn30xxgmx.c,v 1.35 2017/06/29 10:56:18 visa Exp $     */
 
 /*
  * Copyright (c) 2007 Internet Initiative Japan, Inc.
@@ -578,7 +578,7 @@ cn30xxgmx_rx_frm_ctl_enable(struct cn30xxgmx_port_softc *sc,
        struct ifnet *ifp = &sc->sc_port_ac->ac_if;
        unsigned int maxlen;
 
-       maxlen = roundup(ifp->if_mtu + ETHER_HDR_LEN + ETHER_CRC_LEN +
+       maxlen = roundup(ifp->if_hardmtu + ETHER_HDR_LEN + ETHER_CRC_LEN +
            ETHER_VLAN_ENCAP_LEN, 8);
        _GMX_PORT_WR8(sc, GMX0_RX0_JABBER, maxlen);