Re: wake-on-lan lost from rpi4 (works on rpi3)

 
Van: Mike Karels <mike@karels.net>
Datum: dinsdag, 25 oktober 2022 14:55
Aan: Ronald Klop <ronald-lists@klop.ws>
CC: freebsd-arm@freebsd.org
Onderwerp: Re: wake-on-lan lost from rpi4 (works on rpi3)
> 
> On 25 Oct 2022, at 6:57, Ronald Klop wrote:
> 
> > Hi,
> >
> > When I do "wake ue0 `cat /home/ronald/freenas.ethernet `" on my RPI3B+ my NAS boots and tcpdump shows the following line on my rpi3 as well as on my router.
> > 13:39:44.344111 IPX 00217046.6c:da:00:21:70:46.6cda > 00217046.6c:da:00:21:70:46.6cda: ipx-#6cda 65505
> >
> > When I do "wake genet0 `cat /home/ronald/freenas.ethernet `" on my RPI4 my NAS does not boot and tcpdump only show this on my rpi4 and *not* on my router.
> > 13:37:26.448251 IPX 00217046.6c:da:00:21:70:46.6cda > 00217046.6c:da:00:21:70:46.6cda: ipx-#6cda 65505
> >
> > Firewall ipfw does not indicate that it blocks anything.
> >
> > RPI4 runs:
> > FreeBSD rpi4 14.0-CURRENT FreeBSD 14.0-CURRENT #11 main-4f0c9b76cf: Sat Aug 13 23:59:19 CEST 2022     ronald@rpi4:/home/ronald/dev/obj/home/ronald/dev/freebsd/arm64.aarch64/sys/GENERIC-NODEBUG arm64
> >
> > genet0: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> metric 0 mtu 1500
> >    options=68000b<RXCSUM,TXCSUM,VLAN_MTU,LINKSTATE,RXCSUM_IPV6,TXCSUM_IPV6>
> >
> >
> > RPI3 runs:
> > FreeBSD rpi3 13.1-RELEASE-p2 FreeBSD 13.1-RELEASE-p2 GENERIC arm64
> >
> > ue0: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> metric 0 mtu 1500
> >    options=80009<RXCSUM,VLAN_MTU,LINKSTATE>
> >
> >
> > Does genet0 not support these packages?
> > What can prevent this packet to go on the ethernet while tcpdump still shows it is outgoing on the interface?
> > genet0 does have a vlan configured connected to a bridge0 for some jails
> > vlan3: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> metric 0 mtu 1500
> >    options=80000<LINKSTATE>
> >    groups: vlan
> >    vlan: 3 vlanproto: 802.1q vlanpcp: 0 parent interface: genet0
> >
> > ue0 is itself connected to a bridge0
> 
> Is the RPI3 also on a vlan and bridge?
> 
> Is the router (or switch) expecting the packet on the vlan?
> If so, maybe you need to send on vlan3 rather than genet0.
> 
> The genet interface has some oddities about packet layouts;
> that could be hitting here.  You could try disabling TCP TX
> checksum offload: ifconfig genet0 -txcsum -txcsum6; that
> simplifies some of the issues.
> 
>         Mike
> 
> > Regards,
> > Ronald.


Hi,

Thanks for the hint. I experimented some further.

Disabling -txcsum -rxcsum didn't matter.

But when I use bridge0 or vlan3 as device then it goes into the wire but on the VLAN which is not where my NAS is which I want to boot.

Looking at the driver I found this interesting peace of code.

static int
gen_parse_tx(struct mbuf *m, int csum_flags) {
...
        if (ether_type == ETHERTYPE_IP) {
                COPY(((struct ip *)p)->ip_hl << 2);
                offset += ((struct ip *)p)->ip_hl << 2;
        } else if (ether_type == ETHERTYPE_IPV6) {
                COPY(sizeof(struct ip6_hdr));
                offset += sizeof(struct ip6_hdr);
        } else {
                /*
                 * Unknown whether other cases require moving a header;
                 * ARP works without.
                 */
        }
...
}

There is also some code which handles EHTERTYPE_VLAN.

I don't have time to start debugging this today. But would this ring a bell to anybody in connection to a wake-on-lan packet?


Regards,
Ronald.