Disabling VLAN_HWTAGGING

[Jacob S. Barrett]

On Thursday 25 March 2004 03:45 pm, you wrote:
> > Can you disable VLAN_HWTAGGING?
>
> Not without modifying if_nge.c, but it should be pretty trivial.

As trivial as setting chaning:
ifp->if_capabilities = IFCAP_HWCSUM | IFCAP_VLAN_HWTAGGING;
to:
ifp->if_capabilities = 0;

This didn't solve the problem completely though.  On the remote host I can now 
see tagged frames from the if_nge host, but the reply frames from the if_em 
host or not visible at all on the if_nge host (via tcpdump).

tcpdump on if_em host:
16:41:28.741109 11:22:33:44:55:66 ff:ff:ff:ff:ff:ff 8100 60: 802.1Q vlan#2 P0 
arp who-has 10.2.0.2 tell 10.2.0.1
16:41:28.741161 0:90:27:f4:58:1d 11:22:33:44:55:66 8100 60: 802.1Q vlan#2 P0 
arp reply 10.2.0.2 is-at 0:90:27:f4:58:1d

tcpdump on if_nge host:
16:41:27.079515 11:22:33:44:55:66 ff:ff:ff:ff:ff:ff 8100 46: 802.1Q vlan#2 P0 
arp who-has 10.2.0.2 tell 10.2.0.1

ifconfig:
nge0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
        inet6 fe80::209:5bff:fe1a:7680%nge0 prefixlen 64 scopeid 0x2
        ether 00:09:5b:1a:76:80
        media: Ethernet 1000baseSX <full-duplex>
        status: active

ngeth0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
        inet6 fe80::2a0:c9ff:feac:c55c%ngeth0 prefixlen 64 scopeid 0x6
        inet 10.2.0.1 netmask 0xffffff00 broadcast 10.2.0.255
        ether 11:22:33:44:55:66

script to setup VLAN:
ifconfig nge0 up
ngctl mkpeer nge0: vlan lower downstream
ngctl mkpeer nge0:lower eiface vlan2 ether
ngctl msg nge0: setpromisc 1
ngctl msg nge0: setautosrc 0
ngctl msg nge0:lower addfilter "{ vlan=2 hook=\"vlan2\" }"
ifconfig ngeth0 link 11:22:33:44:55:66 up

> ng_vlan(4) doesn't provide support for hardware VLAN tagging for output
> frames -- it always emits ETHERTYPE_VLAN type Ethernet frames.

Yeah, that is why I figured disabling VLAN_HWTAGGING might help.

> > I am wondering if it is something to do VLAN_HWTAGGING.  The if_em cards
> > I have don't do it and work fine, but the if_nge cards don't work at all.
>
> What FreeBSD version you're seeing the panic on?

I forgot to mention this was on CURRENT as of 3/24/2004.

-- 
Jacob S. Barrett
jbarrett at amduat.net
www.amduat.net

"I don't suffer from insanity, I enjoy every minute of it."