nfe support for jumbo frame

[Huang, Yusheng]

Hi all,

We have ported nfe driver to our product and when we try to set mtu to 9000 on nfe interface, it does not work. No jumbo frame buffer were allocated. Looking at the code, we found the following:

In nfe_ioctl:

	else {
		NFE_LOCK(sc);
		ifp->if_mtu = ifr->ifr_mtu;
		if ((ifp->if_drv_flags & IFF_DRV_RUNNING) != 0) ==> if IFF_DRV_RUNNING is set, call nfe_init_locked
			nfe_init_locked(sc);
		NFE_UNLOCK(sc);
	}
However, in nfe_init_locked, it has the following test:


	NFE_LOCK_ASSERT(sc);

	mii = device_get_softc(sc->nfe_miibus);

	if (ifp->if_drv_flags & IFF_DRV_RUNNING) ==> if IFF_DRV_RUNNING is set, return

		return;

	nfe_stop(ifp);

	sc->nfe_framesize = ifp->if_mtu + NFE_RX_HEADERS;

So it ends up doing nothing.

Is there something we missed totally on changing the mtu?

-yusheng