Date: Mon, 24 Jan 2011 09:05:48 -0800 From: "Huang, Yusheng" <yusheng.huang@bluecoat.com> To: <net@freebsd.org> Subject: nfe support for jumbo frame Message-ID: <B583FBF374231F4A89607B4D08578A4308BA3C86@bcs-mail03.internal.cacheflow.com>
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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
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